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rneu8z | What are some ways to describe the protagonist’s physical appearance from a first person perspective? I'm looking for advice on ways one can describe the physical appearance of the protagonist from their pov in first person, present tense (besides them getting dressed or looking in the mirror)? I am still trying to fig... | As a reader, I notice descriptions but often don't remember them if they turn out to be irrelevant to the story. In first person, the thing I most hate is character observations of themself that no one ever makes. I once rage-quit a book wherein the MC described how her hair waved behind her as she swam, which isn't so... | Comparison is the best way imho. That being said, I don’t think this is something you really need to do as much as you might think. | answer_1 |
rzek47 | Any dentists here? Questions about zero waste toothpaste In writing an article on my blog about my experience with zero waste toothpaste and general dental hygiene. I've tried: Oil pulling Dental tabs (with fluoride) Georganics dental mineral toothpaste Georganics tooth powder DIY tooth powder The one I've personally s... | Dentistry had a huge wave of disposables, but there is a new movement to stop throwing so much stuff away, but we're also up against cross contamination, so we just try. Keep what we can, throw away what can't be cleaned. | https://youtu.be/2mUUrZJaHPU | answer_1 |
or48s3 | How to deal (dispose) of cat feces I adopted a cat last April and I've been using a bentonite clay clumping cat litter as that was the suggested cat litter sand to use by people in the cat groups. Lately, accounting all the trash I've produced because of the cat litter, I want to minimize or completely get rid of my co... | Is your cat smart enough to be toilet trained? That might be a good low waste future option. You can train it with a template cutout over the toilet bowl. | Location? My council accept animal faeces in the green bin pickup. Definitely check that out first. Do not toilet train your cat. No council recommends that in their waste water. | answer_2 |
133809 | What to do when you reach a conclusion and find out later on that someone else already did? <sep> Say you've thought hard about a specific issue in your research and have elaborated a possible answer, interpretation, etc., to tackle it. (I'm not thinking about huge research subjects, but rather small ideas that articul... | This happens quite a lot if you are working in a field with a lot of current research interest. Things that you know are also known by others. People working parallel tracks can often come to the same insights at about the same time. If there is nothing novel in your work compared to the other, you just do what you wou... | I'd argue that this is pretty common in research. As a consequence, the right thing to do is just cite the paper. If, however, your derivation/interpretation/explanation is slightly different, you should both cite the paper and present your own work. It may feel unfair to you, that you don't get credit for coming up wi... | answer_2 |
7450 | How many class room hours does the typical university teacher teach per week? <sep> I am wondering, for full time university teachers (not those who also have research responsibilities), what is generally the number of hours per week that they teach? I currently teach 20 hours per week and find the load quite heavy giv... | It depends on the type of institution. at my university, a post 1992 UK university in Newcastle, myself and some other colleagues teach on average 14 hours a week! yes and you have to research and engage in administration, including marking (lots of it) meeting students, supervising both under and post graduate student... | Depends to different parameters, but university generally expects each academic staff works 40% research 40% teaching 20% involvement in committees and university meetings Of course, different personalities have different interests to focus on either of research or teaching activities. That's why, some take more course... | answer_1 |
47411 | Making latex sourcefiles publicly available by default <sep> Question: where can I find (legal/pragmatic) information about having latex source files for scientific articles publicly available on github? Or, how would you deal with it? Problem description: I like using git for collaborative tex'ing. So why not use it f... | If you upload your papers to arXiv, then your Latex source is already publicly available there (click "other formats" and then "download source"). So the only difference is that the source would also be available on Github. There is no legal issue with this unless you sign an agreement that forbids it. In that case, th... | It is a very common practice for authors to include the LaTeX source files within an arXiv submission. I don't understand why a publisher who is okay with a preprint being published would not be okay with the LaTeX source being published with the rest on arXiv. Most information in a PDF file can be easily plagiarized (... | answer_1 |
60897 | Storage space running out. Some system functions may not work <sep> In my Android in notification bar I see message <code>Storage space running out. Some system functions may not work</code>. When I check I see <code>188 MB free</code> in device memory and around <code>10 GB</code> in USB storage. I re-installed Androi... | On Samsung phones, type in the dialer <code>*#9900#</code> then choose the second option: "Delete Dumpstate/logcat". | I had the exact same problem. Had the phone into the Samsung Service location a number of times, where they performed a full software recovery twice and then replaced the mainboard, but the problem persisted. I realised that the memory logs, which were filling up the logs file, seem to be connected to a network issue a... | answer_1 |
272038 | MacBook Pro 2016: Keyboard key stuck how to remove key? <sep> Regularly different keys on my new MacBook Pro (2016) are stuck. I assume little pieces of dirt or small crumbs interfere with the mechanics. With older Mac keyboards, I occasionally removed individual keys for cleaning. As the keyboard of the current model ... | Yes, it is possible to remove the keys safely and clean them. But first, it is important to know how it looks below the keycap in order to not damage anything: The key cap is attached to the mechanism by two claws and two hooks. the hooks (left side of the image) are at the bottom of the cap and they would break if you... | I had the same issue with a stuck / spongy Enter key, and after reading through this Reddit thread I just did what people were suggesting there strongly blow air on it and keep on hammering the key at the same time and it fixed the issue, they key is nice and clicky again! | answer_1 |
725 | Bootup on lower power not functioning <sep> I have a custom Arduino ATMega328 board that generally runs at 5V @ 8MHz (using the Arduino Pro 3.3V 8MHz profile and bootloader). The main reason I'm using this setup is so that I can put the board to sleep when main power is disconnected and it starts being run off of batte... | Exactly what is happening and why cannot be determined based on the amount of info provided. However, I see at least one potential problem which would at least partially explain the symptoms described. You said that you are using diodes to select the voltage supply, and one supply is a 3V battery. If you are using stan... | I think the problem is with your bootloader, but not in the way you think. When an Arduino starts up, a bootloader profiting several tasks, such as looking for a serial host or loading program data from flash is going to take a lot more energy than a sleeping Arduino. I think the reason why your Arduino will not start ... | answer_1 |
65935 | Why were the first airplanes "backwards"? <sep> In the question Is the location of an aircraft spoiler really that vital? the accepted answer states "Surfaces behind the CoG act as stabilisers, keeping the nose pointing forward. An aeroplane has vertical and horizontal tail surfaces at the back just for this purpose." ... | Remember that the aviation pioneers were inventing the skills required to fly while refining their designs. It would be a great help to actually see the position of the elevator while trying to relate its movements to the results. We relate control pressures (which we sense in our hands and feet) to the aircraft moveme... | They were not backwards, they had a huge horizontal stabiliser at the aft section!. Angular accelerations are relative to the CoG. If there is only one aerodynamic surface, it must be behind the CoG in order to self stabilise. If there are two of them, like in the plane through the Y-axis, basically the same stipulatio... | answer_1 |
1210 | How are the categories for climbs decided? <sep> In cycle racing, there are five grades or categories for climbs - Category 4, 3, 2, 1 & Hors (Above Category or HC). How do they decide what is category 1 and what makes it so hard it is a HC? | As has been mentioned, the actual categories are fairly subjective. Things such as the fame of a climb as well as how the organizers feel about giving out King of the Mountain points on a given stage will affect rankings. That said, there are some general rules of thumb if you want to get an idea of how your local clim... | The tour organizers rank them subjectively based on their steepness, length, and also where they occur in the stage (climbs near the finish garner a higher ranking). Another criterion which seldom makes a big difference is road condition. Some people feel that the ratings have been inconsistent over the years, or have ... | answer_1 |
38319 | Teaching a child to push off <sep> My four year old started riding a pedal bike a few days ago, and thanks to his balance bike took to it like a fish to water; he's going up and down the street or park like a pro already. He sometimes is able to push off to start, particularly downhill of course, but on straightaways h... | In my experience, kids don't realise that they have to push hard at the start. It seems obvious (even "intuitive") to us, but not to them. On the balance bike, one can just push along gently, but this new bike is bigger and heavier, and the gearing makes it harder. So my advice is to encourage him with an enthusiastic ... | I actually just taught my 5 y/o niece to ride without training wheels last weekend. First thing was that coming from training wheels she wasn't able to take off from being on her feet, rather the balance of the training wheels (which is easy). So baby step one was to hold her balanced on the bike during take off. My ph... | answer_1 |
19762 | Why are there species instead of a continuum of various animals? <sep> As I understand it, various animal traits have to evolve gradually, but what happens to the species that are "neither here nor there"? To put it differently, if a species evolved from another, it did so because it's somehow better, right? So why are... | Typically when both new and old species still exist it is because evolution pushed the new one into a different habitat or role. As a hypothetical example reef fish vs. deep water fish and their relative size. Let's say deep water fish evolved into reef fish, but we still have deep water fish. So there were deep water ... | Short answer <blockquote> Why are there species rather than a long continuum? </blockquote> Three important reasons I could think of are sex, non-uniform adaptive landscape and ancestry. Long answer I am not sure I'll answer your question so let me know if I miss your point or if I help! To start with, you might want t... | answer_2 |
19246 | Is there an 'anti-virus'? <sep> A virus spreads around and usually attaches itself to the host, multiplies & causes diseases. But is there something like an anti-virus? A single celled entity that does the opposite: spreads around 'kills' other viruses and/or cures diseases. Has anybody discovered something like it or ... | There is a "anti-virus," although many call it a virophage.In 2008, a paper in Nature was published about the observations of a new strain of a virus known as Acanthamoeba polyphaga mimivirus. This virus mainly attacks amoeba. It was discovered in 1992. It was one of the biggest viruses ever found.Later, a related viru... | There is no anti-virus to all viruses and there is no such anti-virus against a single virus yet, but there is immune response to virus. How efficient the immune response is then depends on many things. There is no perfect immune response. To develop such an antivirus that decreases viral load requires cooperation with... | answer_1 |
108052 | Why don't viruses reach broad concentration outdoors in a city like allergens? <sep> Why don't airborne viruses reach concentrations that infect most people vulnerable outdoors in a city the way an allergen can cause inflammation to everyone sensitive to it. Both are (often) microscopic airborne biological particles pr... | In another answer elsewhere on StackExchange, a poster estimated that there might be something like 100 g to 1 kg of SARS-CoV-2 virus worldwide, and that's an estimate of all the virus, including what remains in the bodies of infected individuals, not just what makes it to the outside world. I'm not certain of the accu... | 2, 4, 5, and 6. 6 being that the UV light (from the sun), fluctuations in temperature, humidity, wind etc mean that the virions are decayed relatively rapidly for most virus species. To address (1): In general a virus, such as SARS-CoV-2 or influenza is about 100 nanometres (0.1 micrometres (m)) in diameter, whereas a ... | answer_2 |
8 | How do I develop mobile applications for Bitcoin? <sep> I would like to develop a mobile Bitcoin application for the Android and iPhone platforms. What libraries and resources can I use? | Bitcoin client provides RPC calls which are in JSON, you could communicate via the RPC to make your app. | Currently there are only a few mobile apps that use the bitcoin protocol itself. Most communicate with a bitcoin client on a remote machine using the JSON API. Those few that do, rely on BitcoinJ which is a "selfish" implementation of bitcoin that runs in Java (handily the native language for Android apps). It's got a ... | answer_2 |
51871 | Have "molecular clusters" for azeotropes been identified? <sep> A different question about azeotropes got me thinking about this point again. Azeotropes have a very specific composition so it seems that the azeotrope ought to have some sort of physical structure. It seems to be a "molecular cluster" of some sort. The a... | No, in the absence of extra data, there is no reason to suppose that there is any vapor-phase cluster formation. Cluster formation in the gas phase would demand very, very strong departures from ideal-gas behavior. To the contrary, the ideal gas law is an excellent descriptor of gas phase mixtures of ethanol and water.... | In positive azeotropes for which the boiling point is less than the boiling points of any of the constituents the intermolecular interaction of the different molecules is less than in the pure liquid phase. Therefore it is not very likely that clusters involving the different molecules will be formed. In negative azeot... | answer_1 |
244590 | CAN Bus testing <sep> I am creating a Python 3.8 script that executes a series of tests that reads and writes information to and from a CAN bus network. I'm using the python-can and the cantools packages. I've managed to transmit and receive data with small functions individually without issue. I feel I'm not creating ... | In-band error signalling <code>return signal_data # ... # reports false if message fails to be received return False </code> is problematic. You're forcing the caller of this code to understand that the return value has at least two different types: boolean or whatever "signal data" is. The Python way to approach this ... | Protected Variables Underscore is used to mark a variable <code>protected</code> in python classes <code>_counter = 0 </code> should be <code>counter = 0 </code> Use of min_<foo<max_ is permitted in python <code> if (ct > ct_min) and (ct < ct_max): </code> can be <code> if ct_min < ct < ct_max: </code> | answer_1 |
19706 | How do I clean a pasta maker? <sep> I am experimenting with a home pasta maker, and after all the fun comes the cleaning up. My worries come from tiny bits of dry dough I find when I clean the machine. There always seem to be more every time I shake it, and they of course contain raw egg . On the instructions, it clear... | A couple of things that might help help on this one: If your machine has a few dried pasta crumbs on it, just leave it out to dry and knock / pick the dried dough out with a brush or a chopstick. Don't worry too much about any crumbs of dried egg dough making you sick. You are going to boil whatever noodles you make fo... | I have a Kitchen Aide metal pasta maker! You cannot make pasta without some particles getting caught in the machine no matter how carefull you are! I have made Ravioli for 45 years and cannot understand why a machine was made that you cannot take apart and clean the inside! We have tried a paper clip, straighten and sh... | answer_1 |
27745 | Can food be boiled "extra fast/hard" in water? <sep> Once water is boiling you can either leave the heat on quite high, or turn it down a bit so that it just keeps boiling. Apart from extra water vaporating, does this have any effect on the taste of food you're boiling (meat, vegetables, eggs, etc.)? With just common s... | In my experience, the most likely impact of a gentle boil vs. a furious rolling boil is going to be on texture of starchy foods, such as potatoes or other root vegetables, rather than flavor. I've found that a gentle simmer of potatoes will result in a mostly intact shape and consistent texture, whereas an aggressive b... | At a normal atmospheric pressure, even the steam created by boiling will only be 100C. However, you will have to worry about the food touching the bottom part of the pan, as that can, and will, get hotter than the water. So if what you're boiling is suspended or floating then no, it won't be any different. I figure it'... | answer_1 |
10918 | How to prove the security of the PRNG? <sep> Are there any realties tests or criterias that prove the security of the PRNG? What kind of tests or criteria? | <blockquote> How to prove the security of the PRNG? </blockquote> My best advice would be to start with a statistical test suite like the one NIST describes in "A Statistical Test Suite for Random and Pseudorandom Number Generators for Cryptographic Applications" (PDF). Its a battery of statistical tests to detect non-... | As mentioned, most proofs of PRNG security are really proofs of a protocol that uses some underlying construct. The proofs say, "If the construct can't be broken, then the protocol that uses it can't be broken any easier than that." That makes all these proofs subject to the assumption that the underlying construct (li... | answer_1 |
53257 | Paillier Homomorphic encryption to calculate the means <sep> Paillier Homomorphic encryption supports addition and multiplication with plaintext value. Can I use these properties to calculate the means of cipher-text values? I try to use the following steps: Multiply set of cipher texts (to get there sum in plaintext v... | The Paillier encryption of an integer $x_i$ is given by $c_i = (1+x_iN)r_i^N \bmod N^2$ for some random $0<r_i<N$. Given the encryption of $x_1, \dots, x_k$, the encrypted mean is defined as $$[\![\mu]\!] = \left(\prod_{i=1}^k c_i\right)^{k^{-1}\bmod N} r^N\bmod N^2$$ for some random $0<r<N$. If we now apply Paillier d... | <blockquote> The problem I have is that, paillier is defined in integer domain $\mathbb Z$ thus $\frac1c$ is always 0 so the final results is also 0. </blockquote> You are trying to use real-valued arithmetic here. You are in the wrong field for that. If you are using Paillier Encryption you work in $\mathbb Z_n^*$. Th... | answer_1 |
67135 | What is a "contradiction" in constructive logic? <sep> In Practical Foundations for Programming Languages, Robert Harper says <blockquote> If for a proposition to be true means to have a proof of it, what does it mean for a proposition to be false? It means that we have a refutation of it, showing that it cannot be pro... | It is immaterial whether we speak about constructive or classical logic in this situation. If you read your questions again, you will see that they apply to boths kinds. The only difference that we need to take notice of is the presentation of negation $\lnot A$. It can be presented in several ways classically, but int... | A contradiction is usually represented as $A \land \lnot A$. It's typical in intuitionistic logic to define $\lnot A$ as $A \Rightarrow \bot$. It's clear we can derive $\bot$ from $A \land \lnot A$. Ultimately, a contradiction will be a hypothetical derivation of $\bot$ as the very definition of $\lnot$ suggests. It wi... | answer_1 |
80168 | Why does this not prove $P\neq NP$? <sep> Fiorini, Massar, Pokutta, Tiwary and De Wolf (Exponential Lower Bounds for Polytopes in Combinatorial Optimization, Journal of the ACM 62(2):article 17, 2015; PDF, ArXiv) show any linear program that solves travelling salesman needs super-polynomially many constraints. Suppose ... | What Fiorini et al. show is the following: <blockquote> The TSP polytope $P_n$ over $n$ points is a polytope in $\binom{n}{2}$ dimensions whose vertices correspond to all Hamiltonian cycles in $K_n$ (the complete graph on $n$ vertices). (That is, it is the convex hull of the indicator vectors of all Hamiltonian cycles.... | What you're proposing isn't "a linear program for TSP", so it doesn't come into the scope of the proof. You've observed that, if $\mathrm{P=NP}$, then TSP can be reduced to polynomial-sized linear programs. You're using a polynomial-time Turing machine to perform a slightly more complicated version of the following red... | answer_1 |
22828 | Clustering with cosine similarity <sep> I have a large data set and a cosine similarity between them. I would like to cluster them using cosine similarity that puts similar objects together without needing to specify beforehand the number of clusters I expect. I read the sklearn documentation of DBSCAN and Affinity Pro... | All clustering methods use a distance metric of some sort. And remember that distance is essentially a dissimilarity measure. So if you normalize your similarity betwen 0 and 1, your distance is simply 1-similarity As for algorithms that do not require a number of clusters to be specified, there are of course hierarchi... | I'd use sklearn's Hierarchical clustering <code>from sklearn.feature_extraction.text import CountVectorizer, TfidfTransformer from scipy.cluster import hierarchy #Vectorizing X = CountVectorizer().fit_transform(docs) X = TfidfTransformer().fit_transform(X) #Clustering X = X.todense() threshold = 0.1 Z = hierarchy.linka... | answer_2 |
102620 | Query the definition of a materialized view in Postgres <sep> I'm wondering how to query the definition of a materialized view in Postgres. For reference, what I hoped to do is very similar to what you can do for a regular view: <code>SELECT * FROM information_schema.views WHERE table_name = 'some_view'; </code> which ... | Turns out this wasn't as complicated as I thought! (With just a little knowledge of pg_catalog...) Part 1: Query whether a materialized view exists: <code>SELECT count(*) > 0 FROM pg_catalog.pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind = 'm' AND n.nspname = 'some_schema' AND c.relname = 'som... | Looks like 9.3 and up you can do: <code>select * from pg_matviews; select * from pg_matviews where matviewname = 'view_name'; </code> More info found here: https://stackoverflow.com/questions/29297296/postgres-see-query-used-to-create-materialized-view | answer_2 |
52244 | A way to reference the ID in a multi insert transaction? (postgres) <sep> Assuming table "entity.eid" is auto incrementing, I want to be able to reference the autoincrement value assigned later in the same transaction. The way I have been doing this is by doing multiple transactions which I think is not optimal. <code>... | You don't specify your Postgresql version, but if you are using 8.4+ you can use the <code>RETURNING</code> clause to return the id (or any column) that just got inserted. Docs: http://www.postgresql.org/docs/current/static/sql-insert.html Example: <code>INSERT INTO t2 (eid, ...) VALUES (...) RETURNING eid;</code> If y... | There are different ways to do this. The easiest way is to use the <code>lastval()</code> function which will return the value generated by the "last" sequence nextval. <code>START TRANSACTION; INSERT INTO entity ...; INSERT INTO t2 (eid, ...) VALUES (lastval(), ...), (...), (...); COMMIT; </code> If you know the name ... | answer_2 |
215039 | Why can I not assemble conduit around cable, but must pull it after assembly? <sep> I have seen a number of answers here from our esteemed electricians about running wiring through conduit, and many of them include a warning similar to: <blockquote> You're not allowed to piece the conduit together over the wires - they... | Guaranteed Reusability If you run the wire as you are putting together the conduit, there is a possibility, unless you are truly careful about all the details, that you could end up in a situation where your initial set of wires are perfectly fine, but that pulling them out to replace them - or more likely pulling in n... | Far more opportunity to damage the wire insulation - either by mechanical damage from the exposed ends of the conduit/fittings being slid along the wires (metal or PVC), or from cement/primer if PVC. An assembled conduit (or duct) will have all the various ends joined (and de-burred to remove any internal sharp edges, ... | answer_1 |
1881 | Camera calibration/pin hole camera model and working out 3d position <sep> I have a calibrated camera and have the intrinsic parameters. I also have the extrinsic parameters relative to a point (the world origin) on a planar surface in the real world. This point I have set as the origin in the real world coordinates [0... | If you have the extrinsics then it is very easy. Having extrinsics is the same as having "camera pose" and the same as having the homography. Check this post in stackoverflow. You have extrinsics, also called camera pose, which is described as a translation and a rotation: $\displaystyle Pose =\begin{bmatrix}R|t \end{b... | You have two options, use back projection or projection between two planes (homography). With back projection you take a pseudo inverse of you camera matrix $P$ and multiply the result with your homogenous presentation of image point: $$ P = K\begin{bmatrix}R & -R\textbf{C}\end{bmatrix} \\ \textbf{X}_{reprojected} = P^... | answer_1 |
34936 | Time domain maximum from frequency domain data? <sep> Is it possible to calculate the maximum value of a time-domain signal from frequency-domain representation without performing an inverse transform? | Suppose that Alice has a vector $\mathrm x \in \mathbb R^n$. She computes the DFT of $\mathrm x$ $$\mathrm y := \mathrm F \mathrm x \in \mathbb C^n$$ where $\mathrm F \in \mathbb C^{n \times n}$ is a Fourier matrix. Alice then tells Bob what $\mathrm y$ is. Since the inverse of the Fourier matrix is $\mathrm F^{-1} = \... | It's generally not possible to compute the exact maximum value, but you can compute a bound on the maximum value. Assuming your data are discrete-time, and you're using the discrete Fourier transform (DFT), you have the following relation between time domain and frequency domain: $$x[n]=\frac{1}{N}\sum_{n=0}^{N-1}X[k]e... | answer_1 |
1590 | Probability distribution of windowed cross-correlation <sep> This question is in the context of time-delay estimation. Say I have a stationary Gaussian stochastic process $g$, and I know its autocorrelation function $R_g(\tau)$. To do time-delay estimation, I'm computing a windowed cross correlation between $g$ and a d... | Expanding on my comment, $\{\phi(\tau)\}$ is a non-stationary nonGaussian random process, and I doubt that there is any simple answer (or even a rather complicated one) for the probability density function of the random variable $\phi(\tau)$ for an arbitrary value of $\tau$. But, the (time-varying) mean function of the... | I do not know the answer to your question, but perhaps this paper can help. I realize that you are not using single bit random waveforms, but the formulation on the distribution they calculated is fairly through. "Probability distribution of the crosscorrelation function of finite-duration single-bit random waveforms" ... | answer_1 |
56727 | What is the purpose of a resistor in the feedback path of a unity gain buffer? <sep> I often see unity-gain followers with a resistor in the feedback path. For an ideal op-amp, of course, there is no current into the input, and this resistor does nothing. What is its effect with a real op-amp, and how do I choose its v... | Here's an excerpt from the OP27 data sheet, showing that the answer is more involved than equalizing the impedances seen by the two inputs: And another example, from the AD797 data sheet: | One reason the feedback resistor may be used is to match the output impedance of Vin. Real Op-amps have input current bias and input current offset. Take for example this representative circuit: Here, I've create a more realistic model of an op-amp by adding current sources which simulate the current flowing into a rea... | answer_1 |
32138 | How do we test reliability and quality so as to minimize the risk of board failure in the field? <sep> We are developing a smart cable for a customer. The market potential is hundreds of thousands of units. The vendor who designs and supplies the boards (with firmware) that will be built into the cables is making proto... | There are several different ways to approach this problem. Typically one does testing where the device is operated under stressful conditions to reduce its lifetime. This can include elevated temperature, temperature cycling, vibration, humidity, etc. Sometimes the test protocol runs to failure. The failure may be repa... | The first step is common sense. Does it look robustly designed? Are there obvious mechanical stress points? Is there proper strain relief wherever something flexes? Are all the datasheet limits carefully adhered to in all possible corners of normal operation with some reasonable margin? Does the design handle the obvio... | answer_1 |
7624 | Can an FPGA design be mostly (or completely) asynchronous? <sep> We had a very short FPGA/Verilog course at university (5 years ago), and we always used clocks everywhere. I am now starting out with FPGAs again as a hobby, and I can't help but wonder about those clocks. Are they absolutely required, or can an FPGA-base... | A short answer would be: yes; a longer answer would be: it is not worth your time. An FPGA itself can run a completely asynchronous design no problem. The result you get is the problem since timing through any FPGA is not very predictable. The bigger problem is the fact that your timing and resultant design will almost... | Yes. If you have no process type constructs then it shouldn't do things like inferring registers. There will be things like onboard memory that require clocks, although if you really want to you could probably generate these asynchronously. | answer_1 |
24723 | Any drawbacks to "low temp" lead-free solder paste? <sep> I am about to try my first "reflow skillet" soldering job, and as I look at the available types of solder paste I see there are lead-free pastes with much lower melting temperatures than others. For example, this one from ChipQuik. The advantages seem obvious, b... | 42/58 Tin / Bismuth is not unknown as a low temperature solder but has issues. While widely used for some very serious applications (see below) it is not a mainstream industry contender for general use. It is not obvious why not given its substantial use by eg IBM. Identical to the Bi58Sn42 solder you cite is: Indalloy... | The only thing that springs to mind is that some components may get hotter than the solder and melt it? It'd be quite rare for that to happen, but supposing you had a component which used some pins as a heatsink (some use ground pins as this), and it got hotter than the solder could cope with - the solder would melt, t... | answer_1 |
5671 | Is it worth getting a function generator? <sep> Is a function generator necessary for every day lab use, or is it special purpose equipment? That is, does it have similar utility to an oscilloscope, or multimeter - would you use it regularly enough to justify it's cost? | If you check ebay, you can quite a few between cheap and $50. Frankly, I'd do that and put your extra money into oscilloscope. | In the audio frequency range you can use your soundcard. Use google to find the software. | answer_2 |
189851 | Is it wrong/illogical to say ... twisted open the door?" <sep> Example sentence: <blockquote> I twisted open the door. </blockquote> Some people argue that you can't twist a door. You twist a doorknob. However, some people have used this construction. What's the real answer? Or there isn't one? | To me it sounds very odd. As you said, twist a doorknob is good here. | TL;DR "twisted" is probably wrong and "wrenched" is probably right. To me it depends on how strong the subject of the sentence is. "Twisting the door open" could theoretically be an appropriate action if the subject is literally grabbing the door/doorframe and twisting so hard that the door is torn off of its hinges. I... | answer_2 |
123174 | She said shyly some things are not for sharing <sep> In our bathroom there is a bottle of shower gel (see picture), and whenever I see it I wonder if there is something wrong with me or with the text. The text says: <blockquote> Maybe I won[']t tell you she said shyly some things are not for sharing. </blockquote> What... | If I rewrite this slightly to add proper punctuation, then it would sound like; <blockquote> ..."Maybe I won't tell you," she said shyly. "Some things are not for sharing" </blockquote> To put this in context, earlier she seemed to be describing a thought she was having and was about to explain it, but decided not to. ... | This sentence structure seems cluttered. The phrase and clauses run on one another without sufficient punctuation. Also, there is a smidgen of poor grammatical construction. However, is it? Let's look at the whole sentence again. My moment of sweet calm ... just to think with carefree abandon ... maybe I won't tell you... | answer_1 |
573576 | Is there a word or phrase for "promises that can't be kept"? <sep> I know that renege is a word that could suit in here. But as I understand, 'renege' describes the failure to keep a promise. But, sometimes, we make promises that we know all too well that it can't be kept for long. Is there any word or a phrase for suc... | If you make a promise you know you cannot keep, the word for that is lie. I'm not entirely satisfied with this because lie is a broader category; not every lie is a promise, other than in the guarantee (a fact) nuance of promise which appears in I promise you that this is true. However, it's usually clear from context ... | Somebody who commits or attempts to do something they can't succeed at can be said to have bitten off more than they can chew. | answer_1 |
89831 | How do I interpret the dot product of non-normalized vectors? <sep> I know that if you take the dot-product of two normalized vectors, you get the cosine of the angle between them. But if I take the dot-product of two non-normalized vectors (or one normalized, one not), how can I interpret the resulting scalar? | Others have pointed out how you can use the sign of the dot product to broadly determine the angle between two arbitrary vectors (positive: < 90, zero: = 90, negative: > 90), but there's another useful geometric interpretation if at least one of the vectors is of length 1. If you have one unit vector \$\hat U\$ and one... | If the resulting scalar is 0; then it means the 2 vectors are perpendicular to each other (angle difference 90 degrees) . If the resulting scalar > 0; then the angle difference between them is less than 90 degrees. If the resulting scale is < 0; then the 2 vectors are facing opposite directions ( or angle difference > ... | answer_1 |
kg8jgu | Do planes have super-chargers and/or turbo-chargers like cars can? If not, why? I know nothing about planes beyond the simple rotary engine and IM curious about this. It seems like they are operating at such a speed and scale that these additions could be perfect additions as long as it was designed to not add more dra... | I won't beat /u/IsentropicFire for detail, so I'll go for brevity and sideways thinking: A jet engine is basically all turbocharger, and none of the rest of a car engine. | To summarize what's been said about turbos and superchargers so far: the more oxygen your can squeeze into a small space, the more fuel you can burn in that same space. More fuel equals more power. It's almost that simple. If there's not enough oxygen, the fuel doesn't combust completely. This is how some fire extingui... | answer_1 |
kg8jgu | Do planes have super-chargers and/or turbo-chargers like cars can? If not, why? I know nothing about planes beyond the simple rotary engine and IM curious about this. It seems like they are operating at such a speed and scale that these additions could be perfect additions as long as it was designed to not add more dra... | Yes planes have both modes of forced induction, there was attempts to feed compressed gasses as well like NoS. Another induction system was one called a power recovery turbine, a great system that unfortunately never reached its full potential due to high levels of back pressure. There where many attempts at a twin cha... | I won't beat /u/IsentropicFire for detail, so I'll go for brevity and sideways thinking: A jet engine is basically all turbocharger, and none of the rest of a car engine. | answer_2 |
kg8jgu | Do planes have super-chargers and/or turbo-chargers like cars can? If not, why? I know nothing about planes beyond the simple rotary engine and IM curious about this. It seems like they are operating at such a speed and scale that these additions could be perfect additions as long as it was designed to not add more dra... | About the efficiency: commercial jets try to operate just under transonic speeds (about mach 0.8 to 1.3) where drag rapidly increases as the airspeed rises, so it would most likely not be worth it for jets. Not that modern jets would need this for cryise flight anyway, as the highest thrust applied usually is at take-o... | There are already lots of good answers but I'll add mine in too. Yes, planes can and are sometimes supercharged or turbocharged. Unlike with cars though you have better options than piston power, so it's not like this is gonna be the best producer of power. For smaller planes it makes sense to supe up the engine, but a... | answer_2 |
vbj5sg | WHY does V chord want to resolve at the I? Can anyone explain WHY the V chord wants to resolve to the tonic? I’m sure there are reason and I know my fellow Reddit kings and queens can school me on this. Any help would be greatly appreciated as I am a theory noob | Well, it actually doesn’t. No chord *wants* to resolve to any other particular chord - because chords aren’t sentient beings that have a mind of their own; it’s humans that have culturally engrained tastes and expectations of their own - and these obviously can vary quite a lot. For example, most of the music in existe... | Many centuries ago, medieval Europeans decided they really liked half-step resolutions, especially when they went up. It became very much A Thing to approach resolutions with one voice moving a half step in one direction, and the other moving a whole step in the opposite direction, arriving at a perfect interval--which... | answer_2 |
vbj5sg | WHY does V chord want to resolve at the I? Can anyone explain WHY the V chord wants to resolve to the tonic? I’m sure there are reason and I know my fellow Reddit kings and queens can school me on this. Any help would be greatly appreciated as I am a theory noob | One of my theory teachers liked to use the Harmonic/Overtone Series as part of the reason V wants to resolve to I. It also kind of relates to the jazz term "the V is the I." When you study the frequency of the waveform of a single note, you will find there are multiple frequencies resonating. If we play C2, which we ca... | The more comprehensive and historically accurate is the one u/Zarlinosuke gave you: it's the result of a long process of cultural development of a specific melodic and harmonic language, the cumulative result of many small improvements and innovations that led to what we call nowadays the "tonal system", where the V ch... | answer_1 |
vbj5sg | WHY does V chord want to resolve at the I? Can anyone explain WHY the V chord wants to resolve to the tonic? I’m sure there are reason and I know my fellow Reddit kings and queens can school me on this. Any help would be greatly appreciated as I am a theory noob | One of my theory teachers liked to use the Harmonic/Overtone Series as part of the reason V wants to resolve to I. It also kind of relates to the jazz term "the V is the I." When you study the frequency of the waveform of a single note, you will find there are multiple frequencies resonating. If we play C2, which we ca... | Fundamentally the V-I thing is just a distraction; it is better to ask why any melodic tendencies and specific melodic patterns exist at all. The answer to that question is relatively simple: because that's what people before you have done. Where it gets kind of complicated though is that then there's a set of people t... | answer_1 |
vbj5sg | WHY does V chord want to resolve at the I? Can anyone explain WHY the V chord wants to resolve to the tonic? I’m sure there are reason and I know my fellow Reddit kings and queens can school me on this. Any help would be greatly appreciated as I am a theory noob | One of my theory teachers liked to use the Harmonic/Overtone Series as part of the reason V wants to resolve to I. It also kind of relates to the jazz term "the V is the I." When you study the frequency of the waveform of a single note, you will find there are multiple frequencies resonating. If we play C2, which we ca... | Wow, very interesting history behind this in the other comments. My thoughts were that if you listen to popular music the V as the tension/far away, need to come home sound is very common and helps condition this. There is some basis to it as the 3rd of the 5 is the 7 which is only a half step down from the tonic combi... | answer_1 |
vbj5sg | WHY does V chord want to resolve at the I? Can anyone explain WHY the V chord wants to resolve to the tonic? I’m sure there are reason and I know my fellow Reddit kings and queens can school me on this. Any help would be greatly appreciated as I am a theory noob | Fundamentally the V-I thing is just a distraction; it is better to ask why any melodic tendencies and specific melodic patterns exist at all. The answer to that question is relatively simple: because that's what people before you have done. Where it gets kind of complicated though is that then there's a set of people t... | Well, it actually doesn’t. No chord *wants* to resolve to any other particular chord - because chords aren’t sentient beings that have a mind of their own; it’s humans that have culturally engrained tastes and expectations of their own - and these obviously can vary quite a lot. For example, most of the music in existe... | answer_1 |
vbj5sg | WHY does V chord want to resolve at the I? Can anyone explain WHY the V chord wants to resolve to the tonic? I’m sure there are reason and I know my fellow Reddit kings and queens can school me on this. Any help would be greatly appreciated as I am a theory noob | Wow, very interesting history behind this in the other comments. My thoughts were that if you listen to popular music the V as the tension/far away, need to come home sound is very common and helps condition this. There is some basis to it as the 3rd of the 5 is the 7 which is only a half step down from the tonic combi... | The resolution relationship between root and dominant suggests to me a nature of the underlying fabric of the universe. The dominant can be considered a "quantized" measure from the root, as are the other notes of any given scale. In Western 12-step, the essential unit from which all other relationships are derived is ... | answer_2 |
so4j1u | Explain like I'm five years old : If we never manage to create a true absolute zero, how do we know that it sit exactly at -273.15 °c instead of ,uh, -273.69 or something else? | You can think of temperature as the average speed/kinetic energy of each molecule in a gas, just like how you can’t be moving negative 1 miles/hour, absolute zero is the theoretical temperature at which these molecules come to a full stop. If they were moving “backwards” it’s still movement, and therefore higher than a... | In a word: math. It is possible to calculate absolute zero using several gas laws, namely the ideal gas law, PV = nRT. If you rearrange the ideal gas law as a linear equation as you would use on a graph, you can graph temperature against either volume or pressure. Since absolute zero is the temperature at which no part... | answer_1 |
so4j1u | Explain like I'm five years old : If we never manage to create a true absolute zero, how do we know that it sit exactly at -273.15 °c instead of ,uh, -273.69 or something else? | It’s the same reason we can know the speed of light, even though we can’t reach it. It falls out of the math because it’s a fundamental feature of the universe we live in. | You can think of temperature as the average speed/kinetic energy of each molecule in a gas, just like how you can’t be moving negative 1 miles/hour, absolute zero is the theoretical temperature at which these molecules come to a full stop. If they were moving “backwards” it’s still movement, and therefore higher than a... | answer_2 |
9496212 | Navigation, highlight current page <sep> I've got a parent layout and derived from that child sites. The parent layout has a navigation, each navigation point represents one child site. How do i highlight in the parent layout the currently viewed child site? How shall the if look like? | First set a variable in Template its better redable. <code>{% set page = app.request.get('_route') %} <li class="nav-item"> <a class="nav-link {% if page == 'welcome' %}active{% endif %}" href="{{ path('welcome') }}">Home <span class="sr-only">(current)</span></a> </li> </code> | Here's what I did: <code><a href='{{ path( 'products' ) }}'{% if app.request.attributes.get( '_route' ) starts with 'products' %} class='active'{% endif %}>Products</a> <ul> <li><a href='{{ path( 'products_product1' ) }}'{% if app.request.attributes.get( '_route' ) == 'products_product1' %} class='active'{% endif %}>Pr... | answer_1 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | It kind of depends how you want your chili to come out. If you want intact perfectly cooked individual beans I would just add them nearer the end. If you want your beans to slightly break down and meld into the sauce add them earlier. Personally I enjoy a chili where the beans break down a bit and thicken the sauce if ... | Never undercook the beans regardless. If they end up under cooked, it pretty much ruins the whole dish. Over cooked, really no big deal in chili. Specially if the second cook is in chili, beans tend not to suck up too much water when the solution is acidic so they won't get much in there. | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | From my experience I would recommend pre-cooking the beans and if you feel like sweating it, do your best to stop at al dente. Let cool and then use as you would the canned beans. Sometimes when I cooked straight from dry it turned out fine, and sometimes they never seemed to finish cooking. | Canned beans are fully cooked. If you want to recreate a recipe that calls for fully cooked bean, fully cook your dried beans. If you want to increase the flavor mingling of the beans and chili, without having exploded soft beans, you can either mix your fully cooked beans with the chili and let them marinate together ... | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | It would depend on the cook time of the final product to me. If you are simmering it for hours I might leave them slightly underdone. Canned beans are precooked. Nothing is worse than undercooked beans. | If you get some calcium chloride from the canning section of the grocery store it will prevent the beans from getting mushy. It's what canned beans have in them. It's just a type of salt and totally fine. | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | It would depend on the cook time of the final product to me. If you are simmering it for hours I might leave them slightly underdone. Canned beans are precooked. Nothing is worse than undercooked beans. | Fully cook the beans. It's very difficult to overcook beans. Any additional cooking they get in the chili won't make a difference. Undercooked beans can also be mildly toxic. Beans naturally contain a toxin that gets broken down during cooking. How much depends on the bean variety. It's the reason you shouldn't eat a l... | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | From my experience I would recommend pre-cooking the beans and if you feel like sweating it, do your best to stop at al dente. Let cool and then use as you would the canned beans. Sometimes when I cooked straight from dry it turned out fine, and sometimes they never seemed to finish cooking. | If you get some calcium chloride from the canning section of the grocery store it will prevent the beans from getting mushy. It's what canned beans have in them. It's just a type of salt and totally fine. | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | Are you using a pressure cooker? I usually add the cooked dry beans last and cook on high pressure for a few more minutes. | If you get some calcium chloride from the canning section of the grocery store it will prevent the beans from getting mushy. It's what canned beans have in them. It's just a type of salt and totally fine. | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | Its not pasta, its beans. It's mostly fiber. So they're difficult to over cook in the first place and undercooking them is like bitimg rocks. | If you get some calcium chloride from the canning section of the grocery store it will prevent the beans from getting mushy. It's what canned beans have in them. It's just a type of salt and totally fine. | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | Whilst we're on the subject of beans, is I possible to over soak them? Last night I set some beans soaking for tonight's dinner, I wasn't really thinking properly and read 12 hr as 24 hrs. Will they be alright? | Fully cook the beans. It's very difficult to overcook beans. Any additional cooking they get in the chili won't make a difference. Undercooked beans can also be mildly toxic. Beans naturally contain a toxin that gets broken down during cooking. How much depends on the bean variety. It's the reason you shouldn't eat a l... | answer_2 |
az9mmk | Should I undercook dried black beans if they will be cooked again when added to a recipe that calls for canned beans? I'm making a chili recipe that calls for canned black beans, however, I would like to start with dried black beans. Since canned beans are fully cooked, should I fully cook the dried beans first? Or sho... | The trick is to undercook the onions. Everybody is going to get to know each other in the pot. | Fully cook the beans. It's very difficult to overcook beans. Any additional cooking they get in the chili won't make a difference. Undercooked beans can also be mildly toxic. Beans naturally contain a toxin that gets broken down during cooking. How much depends on the bean variety. It's the reason you shouldn't eat a l... | answer_2 |
ge5qwc | Why were Arabic borrowings so commonly taken with the definite article still attached? In the Ibero-Romance languages especially, it seems that more often than not, Arabic loan words were borrowed with some form of the Arabic definite article still attached. Most commonly this is seen in words starting with /al/ as in ... | Haitian Creole keeps the French definite article in many words borrowed from French, so for example "la lune" (the moon) turns into the single word "lalin" in Haitian Creole. So I can at least say that the phenomenon is not specific to Arabic, although IIRC Arabic uses definite articles in more situations than French o... | Hello! Thank you for posting your question to /r/asklinguistics. Please remember to flair your post. This is a reminder to ensure your recent submission follows all of our rules, which are visible in the sidebar. If it doesn't, your submission may be removed! ___ All top-level replies to this post must be academic and ... | answer_1 |
ge5qwc | Why were Arabic borrowings so commonly taken with the definite article still attached? In the Ibero-Romance languages especially, it seems that more often than not, Arabic loan words were borrowed with some form of the Arabic definite article still attached. Most commonly this is seen in words starting with /al/ as in ... | In most languages articles - even fully segmentable ones like in English or for the most part Spanish - really don't exist as separate phonological words. Obviously they're still syntactically separate, but phonologically the article is acting as a kind of half-word called a clitic. Borrowing tends to happen at the pho... | Hello! Thank you for posting your question to /r/asklinguistics. Please remember to flair your post. This is a reminder to ensure your recent submission follows all of our rules, which are visible in the sidebar. If it doesn't, your submission may be removed! ___ All top-level replies to this post must be academic and ... | answer_1 |
ge5qwc | Why were Arabic borrowings so commonly taken with the definite article still attached? In the Ibero-Romance languages especially, it seems that more often than not, Arabic loan words were borrowed with some form of the Arabic definite article still attached. Most commonly this is seen in words starting with /al/ as in ... | That’s only older loanwords though. Recent loanwords from Arabic don’t have any definite article. | Hello! Thank you for posting your question to /r/asklinguistics. Please remember to flair your post. This is a reminder to ensure your recent submission follows all of our rules, which are visible in the sidebar. If it doesn't, your submission may be removed! ___ All top-level replies to this post must be academic and ... | answer_1 |
k1oiq3 | Explain like I'm five years old: Why can't you boil milk in a kettle? I've burnt out my kettle attempting this. My thinking was that milk is just thicker water. I thought it would jusy take longer to boil. I'm in hot water (pun intended) with the wife. | In addition to what everybody else is saying... how are you supposed to clean the kettle? | Kettles aren't well mixed vessels, so you have a single heating element at the bottom where you'll have a hot zone. This isn't a problem when the only thing you're heating is water molecules, but is a problem when you try to heat something which contains fats and proteins. You're going to end up burning anything near t... | answer_1 |
k1oiq3 | Explain like I'm five years old: Why can't you boil milk in a kettle? I've burnt out my kettle attempting this. My thinking was that milk is just thicker water. I thought it would jusy take longer to boil. I'm in hot water (pun intended) with the wife. | The milk fat burn on the heating element. You should steam milk. Or heat a pan up water and put the milk in a vessel that doesn't touch the bottom of the pan. | Kettles aren't well mixed vessels, so you have a single heating element at the bottom where you'll have a hot zone. This isn't a problem when the only thing you're heating is water molecules, but is a problem when you try to heat something which contains fats and proteins. You're going to end up burning anything near t... | answer_2 |
74485 | Why do speedometers (in the US, at least) go so high? <sep> Typically one doesn't drive much faster than 80 MPH. Even in an emergency passing situation, it would be extremely rare to drive more than 100 MPH. In fact, as far as I know many cars have governors built into the engines that prevent them from going much fast... | Actually, the US is one of the few places to have enforced a limit on the maximum speed shown on a speedometer (reportedly to stop people trying to "speed test" their vehicles). For vehicles produced from 1979 to 1981, you'd only see vehicles showing up to 85mph: *The same law dictated the highlight at 55mph http://en.... | Interesting question. Looking around online, it seems to be a combination of marketing (makes the consumer think the engine is powerful) and manufacturing efficiency (can use the same speedometer in faster cars as well as minivans). http://mentalfloss.com/article/59478/why-do-car-speedometers-list-speeds-are-way-over-l... | answer_1 |
7g6t1v | My flour Tortillas never bubble and always go brittle The recipe I've been using is: 3 cups flour 1/3 cup Lard 1 1/2 cup water (hot) 1 tsp Baking Powder I have adjusted as many of the variables as I can and my tortillas always just sit in the pan flat as a board and come out brittle and dry. I've tried using more and l... | 1.) use a scale 2.) if that doesn't work, use a food processor | Have you tried using cold water and cold lard instead? There's no yeast to be concerned about, so it's fine to do. It was tested on Serious Eats, apparently it makes the tortilla more tender (just like with a flaky pastry). And make sure you don't overcook it! 25-30 seconds on medium high heat should be enough. (My gra... | answer_2 |
5318342 | what happens to NSLog info when running on a device? <sep> what happens to NSLog info when running on a device? Where does the text go? Does it get saved? Is it therefore a big overhead when running on a device, or does it effectively get sent to null? | It gets written to the Console log on the device. You can read it in the "Organizer" within Xcode when your device is connected. | The text is logged. You can view the logs in xcode via the (almost-invisible) disclosure triangle in the Devices window as described in another answer. You can also access the logs in a more usable view (including filtering) by opening Console.app on your connected Mac and selecting the device on the left. There will b... | answer_2 |
5318342 | what happens to NSLog info when running on a device? <sep> what happens to NSLog info when running on a device? Where does the text go? Does it get saved? Is it therefore a big overhead when running on a device, or does it effectively get sent to null? | Your device will continue logging even when it's not connected to your mac. To see the logs, you need to open Xcode, click the 'Window' menu item, and then 'Organizer'. Then select your device and then select the 'Device Logs' tab. For some reason (for me at least) viewing the logs seems flaky, so if nothing shows up, ... | It gets written to the Console log on the device. You can read it in the "Organizer" within Xcode when your device is connected. | answer_1 |
5318342 | what happens to NSLog info when running on a device? <sep> what happens to NSLog info when running on a device? Where does the text go? Does it get saved? Is it therefore a big overhead when running on a device, or does it effectively get sent to null? | Your device will continue logging even when it's not connected to your mac. To see the logs, you need to open Xcode, click the 'Window' menu item, and then 'Organizer'. Then select your device and then select the 'Device Logs' tab. For some reason (for me at least) viewing the logs seems flaky, so if nothing shows up, ... | It gets logged out. You can retrieve it by connecting the device and looking in the organizing in xcode | answer_1 |
5796764 | From Photoshop actions to Photoshop scripting? <sep> I would like Photoshop to automatically execute the following task for a given folder: Load all PNG files in a given folder. Convert each file's mode to <code>RGB color</code> Add one layer to each file Save the files as PSD in the same folder I have been told that t... | Let me answer the question you actually asked in bold: There is a tool that automatically generates the Javascript for the actions and events that are taking place in Photoshop. It is called the Script Listener. After using the script listener to record your actions, review the log and make your selective edits. To beg... | look for the file SaveAsDifferentFileType.jsx on your computer, i think you could use this as starting point. There is now way that i know of to generate this code automatically. I think there is no way around learning how it works: Here the documentation: http://www.adobe.com/devnet/photoshop/scripting.html And here a... | answer_1 |
pvjx8z | What is the scientific consensus about the polygraph (lie detector)? I got a new employment where they sent me to a polygraph test in order to continue with the process, I was fine and got the job but keep wondering if that is scientifically accurate, or even if it is legal, I'm not in the US btw. | It is useful for measuring how nervous the subject is. It is useless for detecting lies by those who are not afraid of being caught lying. It is easy to make yourself nervous enough during the preliminary test establishing a baseline that the normal level of nervousness around lying won't register as elevated. | Everyone knows the polygraph is highly inaccurate. The point of the test is not to catch you lying with the test, but to scare you into telling the truth. If, for example, on a job application you said that you never did drugs when in actuality you used to smoke weed, they are hoping that they can scare you into admitt... | answer_2 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | Boats and jet skis don’t run at full throttle. They are dialed back throttles and usually the limiting factor are conditions around cavitation or slip with can pose many safety concerns like runaway engine scenario or catastrophic vibrations. They can run at high loads because they are not air cooled radiators. They ar... | Not that the other answers are wrong, but a huge part of it also has to do with the amount of time expected to be put on the engine. Recreational boat engines are pretty much universally derived from car engines, but are expected to run just a fraction of the time. A recreational boat that sees 50 hours a year would be... | answer_2 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | Boats and jet skis don’t run at full throttle. They are dialed back throttles and usually the limiting factor are conditions around cavitation or slip with can pose many safety concerns like runaway engine scenario or catastrophic vibrations. They can run at high loads because they are not air cooled radiators. They ar... | Something everyone else missed. From a cam and induction standpoint, partial throttle performance is secondary. Racing engines for instance, even on a road course, commonly operate at an average throttle setting above 94%. The driver is expected to keep the speed up and keep it in the right gear to stay in the power ba... | answer_2 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | As others have said, alot of it has to do with heat management. For most Marine engines, the cooling is considerably better than that of a typical automobile. And that's a good thing, as the demand on these engines is MUCH higher than most things on wheels...there is no coasting. There's a huge load at higher throttle ... | Boats and jet skis don’t run at full throttle. They are dialed back throttles and usually the limiting factor are conditions around cavitation or slip with can pose many safety concerns like runaway engine scenario or catastrophic vibrations. They can run at high loads because they are not air cooled radiators. They ar... | answer_1 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | As others have said, alot of it has to do with heat management. For most Marine engines, the cooling is considerably better than that of a typical automobile. And that's a good thing, as the demand on these engines is MUCH higher than most things on wheels...there is no coasting. There's a huge load at higher throttle ... | "Full throttle" is usually more dialed back than you think on those because its converting energy to push water, instead of spin a wheel. The watercraft ive learned on also use the water around it as a cooling feature by actually putting it in and around the engine, which helps dramatically in letting it run high. | answer_1 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | Oh yes. If you’re looking to build a real high performance street motor, keep an eye open for a marine v8 to start with. Forged crank, rods, pistons are the norm because yes they are built to run full throttle all day long. Some blocks are stronger too but that varies. If it was a old school SBC v8 you could be assured... | Piston driven aircraft are another topic that hasn't been touched on. Reliability is the big topic when it comes to recreational and other small aircraft. Piston driven aircraft have oiling systems that can often work regardless the roll or pitch angle of the engine. This is not something you find on boats or stationar... | answer_2 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | To actually answer your question, sometimes they are designed differently. Thinking specifically about generators and pressure washers, they usually run full throttle from startup to shut down, unless it's a newer style with an "idle down" feature. I've tried using an old generator engine on a go-kart and one of the pr... | Piston driven aircraft are another topic that hasn't been touched on. Reliability is the big topic when it comes to recreational and other small aircraft. Piston driven aircraft have oiling systems that can often work regardless the roll or pitch angle of the engine. This is not something you find on boats or stationar... | answer_2 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | To actually answer your question, sometimes they are designed differently. Thinking specifically about generators and pressure washers, they usually run full throttle from startup to shut down, unless it's a newer style with an "idle down" feature. I've tried using an old generator engine on a go-kart and one of the pr... | "Full throttle" is usually more dialed back than you think on those because its converting energy to push water, instead of spin a wheel. The watercraft ive learned on also use the water around it as a cooling feature by actually putting it in and around the engine, which helps dramatically in letting it run high. | answer_1 |
fvzw99 | Are engines that are used to be used a full throttle designed differently than engines that aren’t? For example most boats/jet skis are used at full throttle pretty much the whole time you’re on one, but for cars it’s not an everyday thing to put it petal to the metal (for most people). With that, what design changes a... | Lots of good answers, so I'm just going to share this: Pe**dal** to the metal. Think like accelerating a car. How do you do that? Hold the pedal down flat and it rests on the firewall (made of metal), hence pedal to the metal. | Sort of. The design and calibration of an engine aren't always done for a single use case, so in the case of a marine application it's likely that certain components will be changed, and a calibration will be developed for that application, but the fundamental architecture of the engine will remain mostly the same. If ... | answer_2 |
zm7a25 | why doesn't my sauce stick to my spaghetti? Making sauce from scratch tomatoes, tomato paste and using ground turkey in it. What am I not doing. Very amateur cook. It tastes good but I'm still bummed. | Don't rinse your pasta! | What kind of pasta are you using? A pasta with a lot of grooves will hold sauce better. If your sauce is especially chunky (like mine is) something with a lot of grooves or a hole in the middle like penne would be best. | answer_2 |
zm7a25 | why doesn't my sauce stick to my spaghetti? Making sauce from scratch tomatoes, tomato paste and using ground turkey in it. What am I not doing. Very amateur cook. It tastes good but I'm still bummed. | I agree with finishing together but have to do separate due to someone’s tomato allergy… very light sauce | Buy high-end spaghetti. Cheap stuff you find at the supermarket (like Barilla, Dececco, store brand etc) is smooth like print paper. Sauce tends to slide off it. High end pasta is made in bronze machines and has many imperfections on it. But these imperfections create tiny dimples and crevices that add texture and hold... | answer_2 |
zm7a25 | why doesn't my sauce stick to my spaghetti? Making sauce from scratch tomatoes, tomato paste and using ground turkey in it. What am I not doing. Very amateur cook. It tastes good but I'm still bummed. | I agree with finishing together but have to do separate due to someone’s tomato allergy… very light sauce | Too much liquid, especially if you use fresh tomatoes this happens. Try to cook it a bit longer to boil of some liquid or add a little bit starch to it. | answer_2 |
zm7a25 | why doesn't my sauce stick to my spaghetti? Making sauce from scratch tomatoes, tomato paste and using ground turkey in it. What am I not doing. Very amateur cook. It tastes good but I'm still bummed. | There is a good chance of it happening if you rinse your pasta or if you add oil to the water | Add a little cornflour to thicken it if it’s watery. When I say a little, I mean like a half tablespoon or something and see what happens. | answer_1 |
zm7a25 | why doesn't my sauce stick to my spaghetti? Making sauce from scratch tomatoes, tomato paste and using ground turkey in it. What am I not doing. Very amateur cook. It tastes good but I'm still bummed. | Add a little cornflour to thicken it if it’s watery. When I say a little, I mean like a half tablespoon or something and see what happens. | Drain the pasta well. Then toss it with the hot sauce in the pan. After a minute or so it’ll stick. (Do not put plain pasta in a dish and then plop sauce on top.) A little parm can help, too. | answer_2 |
zm7a25 | why doesn't my sauce stick to my spaghetti? Making sauce from scratch tomatoes, tomato paste and using ground turkey in it. What am I not doing. Very amateur cook. It tastes good but I'm still bummed. | Oil comrade, you forgot to add oil to the sauce mixture. tip: Pour room temp water on the pasta after removing the hot water from it. than spill out the room temp water, and add the sauce | If you're adding oil to your pasta during cooking, don't. | answer_2 |
zm7a25 | why doesn't my sauce stick to my spaghetti? Making sauce from scratch tomatoes, tomato paste and using ground turkey in it. What am I not doing. Very amateur cook. It tastes good but I'm still bummed. | Are you putting oil in the water? | Oil comrade, you forgot to add oil to the sauce mixture. tip: Pour room temp water on the pasta after removing the hot water from it. than spill out the room temp water, and add the sauce | answer_1 |
kbo99c | The Simpsons] How was Homer able to eat all of Hell's donuts with no ill effects, but nearly went blind from eating 64 slices of cheese? [Homer consuming all of Hell's donuts and having the audacity to ask for more Homer struggling to eat 64 slices of american cheese | Perhaps because he is dead he no longer has a real body or any actually feelings and is just a 'spirit'. Maybe it is only the way you percieve something in hell that makes it torture. | The devil's donuts are made of far less toxic ingredients than American cheese | answer_2 |
kbo99c | The Simpsons] How was Homer able to eat all of Hell's donuts with no ill effects, but nearly went blind from eating 64 slices of cheese? [Homer consuming all of Hell's donuts and having the audacity to ask for more Homer struggling to eat 64 slices of american cheese | Because Homer loves donuts | Couple of things. He was in _hell_, where the punishment was designed to make him sick of donuts. You can't get sick of donuts if you get full and no longer want to eat them. Second, hell-donuts aren't nearly as toxic as processed cheese products. It's not even a contest. | answer_2 |
kbo99c | The Simpsons] How was Homer able to eat all of Hell's donuts with no ill effects, but nearly went blind from eating 64 slices of cheese? [Homer consuming all of Hell's donuts and having the audacity to ask for more Homer struggling to eat 64 slices of american cheese | He's in Hell. How did they dice him up without killing him on the conveyer belt when he first went down? How do damned souls not die after getting tortured or etc? It's Hell. | Because Homer loves donuts | answer_1 |
t1sp9m | Explain like I'm five years old what does a mathematician actually DO? Im not at all math savvy. In fact the opposite. I was having a conversation about math with a colleague and I realized that other than teaching i have no idea what someone with a math degree or a “Mathematician” actually does? Im curious now. Whats ... | Lots of industries and companies need to build models of complex systems: business analysts, stock traders, insurance actuaries, sports teams, engineering firms. Other people can also build such models, but mathematicians are the specialists at this. The tech giants employ lots of mathematicians to analyse human behavi... | A programmer once told me that as you get more and more complicated with what your code is trying to do, programming and mathematics converge. A big part of it is that for a lot of things, making a rudimentary algorithm to solve a problem is pretty easy. But this rudimentary algorithm will require a lot of steps and co... | answer_2 |
t1sp9m | Explain like I'm five years old what does a mathematician actually DO? Im not at all math savvy. In fact the opposite. I was having a conversation about math with a colleague and I realized that other than teaching i have no idea what someone with a math degree or a “Mathematician” actually does? Im curious now. Whats ... | Lots of industries and companies need to build models of complex systems: business analysts, stock traders, insurance actuaries, sports teams, engineering firms. Other people can also build such models, but mathematicians are the specialists at this. The tech giants employ lots of mathematicians to analyse human behavi... | Sometimes mathematicians are also useful in the industry because if the way learned to reason and solve problems. Math studies require the ability to focus on one problem and find the most efficient solution for this, it requires rational thinking (als logic is also a great part of mathematics) and mathematicians are u... | answer_2 |
t1sp9m | Explain like I'm five years old what does a mathematician actually DO? Im not at all math savvy. In fact the opposite. I was having a conversation about math with a colleague and I realized that other than teaching i have no idea what someone with a math degree or a “Mathematician” actually does? Im curious now. Whats ... | Mathematician here. My regular job is as an analyst. Analyzing large data sets to identify trends, writing formulas, and yes debating the proper way to calculate metrics with my colleagues. I do a lot of work related to Lean Six Sigma, which is optimization and problem solving. Mathematicians are excellent problem solv... | Lots of industries and companies need to build models of complex systems: business analysts, stock traders, insurance actuaries, sports teams, engineering firms. Other people can also build such models, but mathematicians are the specialists at this. The tech giants employ lots of mathematicians to analyse human behavi... | answer_1 |
t1sp9m | Explain like I'm five years old what does a mathematician actually DO? Im not at all math savvy. In fact the opposite. I was having a conversation about math with a colleague and I realized that other than teaching i have no idea what someone with a math degree or a “Mathematician” actually does? Im curious now. Whats ... | I interviewed a pure mathematician for a course in university. Very interesting gent. He said most of what he does has no real application. He said he spent a lot of time thinking about the foil knot at the time. His average work process was to think about different problems and things that interested him for 2-3 month... | Lots of industries and companies need to build models of complex systems: business analysts, stock traders, insurance actuaries, sports teams, engineering firms. Other people can also build such models, but mathematicians are the specialists at this. The tech giants employ lots of mathematicians to analyse human behavi... | answer_1 |
v2z4kz | It drives me nuts when I ask why electrons don't smash into each other and someone says "the Pauli Exclusion principle" As if the electrons get on the phone and call up Pauli and he tells them they can't smash together.. so they go "ok then". In other words, its a non answer. Whats the real answer? What is the force th... | Second one. It just follows from the way quantum mechanics works. If you write out the state where two electrons occupy the same position with the same spin, you find that it has probability 0 of existing. | In addition to what others have said, Pauli doesn't have much to do with "smashing into each other". Electrons can still scatter off each other. They just can't have identical orbitals. | answer_2 |
v2z4kz | It drives me nuts when I ask why electrons don't smash into each other and someone says "the Pauli Exclusion principle" As if the electrons get on the phone and call up Pauli and he tells them they can't smash together.. so they go "ok then". In other words, its a non answer. Whats the real answer? What is the force th... | In addition to what others have said, Pauli doesn't have much to do with "smashing into each other". Electrons can still scatter off each other. They just can't have identical orbitals. | The Pauli Exclusion principle. | answer_1 |
v2z4kz | It drives me nuts when I ask why electrons don't smash into each other and someone says "the Pauli Exclusion principle" As if the electrons get on the phone and call up Pauli and he tells them they can't smash together.. so they go "ok then". In other words, its a non answer. Whats the real answer? What is the force th... | They call it an “exchange force”, buts it’s not really a force. It’s a property of the symmetries the wave function must satisfy, namely particle exchange. Electrons are identical particles. That means that if you swapped the two electrons you would not be able to tell which one was in which state. Mathematically that ... | Imo your issue is in still thinking of electrons as billiard ball barticles. Electrons are discrete excitations in quantum fields, and depending on the structure of the field they have certain properties. One of the properties is that they cannot 'overlap'. There isn't a *force* per se, it's just the nature of the fiel... | answer_2 |
v2z4kz | It drives me nuts when I ask why electrons don't smash into each other and someone says "the Pauli Exclusion principle" As if the electrons get on the phone and call up Pauli and he tells them they can't smash together.. so they go "ok then". In other words, its a non answer. Whats the real answer? What is the force th... | You talk about "forces" as if they're an inherently more objective way to describe reality than things like the Pauli Exclusion Principle when in fact it's quite the opposite. But still, even if you ignore all quantum mechanics, electrons are charged particles, how would you smash them "into" each other? | Electrons are waves, they overlap with each other spatially. They interact and in some situations that interaction could seem like a smash, but in an atom they have found a stable way to be physically overlapping. | answer_1 |
v2z4kz | It drives me nuts when I ask why electrons don't smash into each other and someone says "the Pauli Exclusion principle" As if the electrons get on the phone and call up Pauli and he tells them they can't smash together.. so they go "ok then". In other words, its a non answer. Whats the real answer? What is the force th... | Electrons are waves, they overlap with each other spatially. They interact and in some situations that interaction could seem like a smash, but in an atom they have found a stable way to be physically overlapping. | Often the answers in relativistic QM are purely maths, it's hard to give a physical picture of Clifford algebras and anticommutation relations to someone who hasn't dealt with the math. It's a trade off at times | answer_2 |
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