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engineering_2826 | engineering | Understanding required torque for a motor lifting a weight | This is a continuation of me trying to understand torque and stepper motors in my other question . I'm trying to understand the torque a motor would be required to generate to lift a small weight, and the formulas involved. The first part of my question is to verify if I am calculating this correctly: Let's say I have ... | 27 | [
"mechanical-engineering",
"motors",
"torque",
"stepper-motor"
] | {
"A": "You have the right concept, but slipped a decimal point. 5 cm = 0.05 m. The gravitational force on your 450 g mass is 4.4 N as you say, so the torque just to keep up with gravity is (4.4 N)(0.05 m) = 0.22 Nm. However, that is the absolute minimum torque just to keep the system in steady state. It leaves nothi... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/2826/understanding-required-torque-for-a-motor-lifting-a-weight |
engineering_2589 | engineering | How do I size metal plates to get the correct dimensions after folding? | I am designing a metal plate that will be laser-cut (or machine-cut) and then folded. I want to know how to size the pre-folded plate in order to get the right dimensions after folding. My actual part is not exactly like this (I simplified it for ease of drawing) but it shows what I want to achieve. In this case it's a... | 15 | [
"machining",
"metal-folding"
] | {
"A": "The picture, below, of the exaggerated long section of the Channel Tunnel was taken from Wikipedia . Full-sized image here . Some of the limiting factors for the Channel Tunnel are: Railways don't like steep gradients The tunnels comprising the Channel Tunnel were excavated using tunnel boring machines (TBMs)... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/2589/how-do-i-size-metal-plates-to-get-the-correct-dimensions-after-folding |
medicine_1276 | medicine | What is excess blood from blood donations used for, and do we ever run out? | I regularly donate blood, however, I am curious as to what happens to my blood after I donate. Obviously some of it will go to people in emergency medical situations, as I intend. However, I have never heard of situations where someone died because we didn't have blood to donate to them; which makes it sound as if we d... | 39 | [
"blood"
] | {
"A": "Most dentists - for most procedures - aim for a painless experience. If there is reason to keep some pain sensation intact, the dentist will inform you, and ask at appropriate intervals if you can feel pain. The efficacy of lidocaine and other local anesthetics depends on how closely your nerve distribution c... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/1276/what-is-excess-blood-from-blood-donations-used-for-and-do-we-ever-run-out |
engineering_28254 | engineering | Why use steam instead of just hot air? | As I understand, a steam machine needs a pressurised gas to work. This can be compressed air but it used to be steam . Energy was provided to the steam engine by heating up water. I don't understand why it used water as the pressurised gas could have been generated only by heating air in a closed tank. Is the design of... | 27 | [
"steam"
] | {
"A": "I would say that using a warm pressurized gas is not very feasible. Ratchet freak already mentioned how you can get much more volume out of heating water into steam than just heating up air until it's warmer. This touches on, but doesn't completely address an important factor about steam as power. Converting ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/28254/why-use-steam-instead-of-just-hot-air |
cybersecurity_128581 | cybersecurity | Hosting company advised us to avoid PHP for security reasons. Are they right? | I'm doing a redesign for a client who's understandably concerned about security after having been hacked in the past. I had initially suggested using a simple PHP include for header and footer templates and a contact form they wanted. They are reluctant because they were advised by their hosting company that using PHP ... | 143 | [
"php",
"shared-hosting"
] | {
"A": "It's not so much that PHP itself has security problems (assuming needed security updates), as it is there exists a lot of popular PHP-based software with rampant security problems. You could fault PHP for being a language that gives you enough rope to choke yourself, but the real problem is just how prevalent... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/128581/hosting-company-advised-us-to-avoid-php-for-security-reasons-are-they-right |
engineering_2695 | engineering | Can I use a ultrasound sensor to measure water level? | If I use an ultrasonic sensor will it detect the water level? I was thinking about a product to read water level on water boxes (common in Brazil). I researched about instrumentation for this measure, and I think that an ultrasonic sensor is the best option. Will the water correctly reflect ultrasound and not change th... | 15 | [
"electrical-engineering",
"measurements",
"sensors",
"control-engineering"
] | {
"A": "Technology used in depth finder, in marine application is mostly like is the best to measure the water from the top. To measure water level from the bottom of tank one could use a piezo electric ceramic transducer combined with an Analog Front End (AFE) and a micro-controller to measure water level. The diagr... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/2695/can-i-use-a-ultrasound-sensor-to-measure-water-level |
medicine_315 | medicine | How are ratios for one person CPR arrived at? | I have not had a CPR (Cardiopulmonary resuscitation) class in 10 or more years, but I used to take them all the time ( like yearly ). For one person CPR the ratio of compression to breaths was always changing. In the US there were two major providers of approved CPR training, It was not unusual for both to have differe... | 16 | [
"first-aid",
"cpr",
"research"
] | {
"A": "Note: The following is excerpted from an article written in 2005. For lay (Non trained) people, there are more updated recommendations. The following is an example of the process, not the current recommendations. To be effective, CPR must restore adequate coronary and cerebral blood flow. Interruptions in che... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/315/how-are-ratios-for-one-person-cpr-arrived-at |
cybersecurity_172148 | cybersecurity | Is it normal for auditors to require all company passwords? | My company is currently engaged in a security audit framed as a pentest. They've requested all admin passwords for every one of our services and all source code of our software. They want logins for Google Apps, credit card processors, GitHub, DigitalOcean, SSH credentials, database access, and much more. Note, we've n... | 306 | [
"penetration-test",
"audit"
] | {
"A": "General SSL (and its successor, TLS ) is a protocol that operates directly on top of TCP (although there are also implementations for datagram based protocols such as UDP). This way, protocols on higher layers (such as HTTP) can be left unchanged while still providing a secure connection. Underneath the SSL l... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/172148/is-it-normal-for-auditors-to-require-all-company-passwords |
medicine_755 | medicine | Can I hear ultrasounds? | I have noticed that every time I am in the same room as an operating ultrasound machine, I can hear it. And not the machine making noises, but the actual ultrasounds (I know because it decreases in intensity after the gel is added). 'Ultrasound' refers to sound waves with a frequency too high for humans to hear (Wikipe... | 13 | [
"hearing",
"medical-device",
"ultrasounds"
] | {
"A": "It is likely you are not hearing the ultrasound itself (typical frequencies are upwards of 1 MHz , far beyond what the human hearing system is capable of detecting). You are probably hearing coil whine from the electronics -- switched-mode power supplies in particular tend to operate towards the upper end of ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/755/can-i-hear-ultrasounds |
cybersecurity_56863 | cybersecurity | What is the purpose of "gibberish" comments posted to my blog? | Fairly frequently, the contact form on my blog gets comments that look similar to this (each field represents a text box users can enter into the HTML form on the blog): Name: 'ceguvzori' Email: 'gwizwo@avbhdu.com' Website: 'QrSkUPWK' Comment: vaB5LN pepddqfgpcwe , [url=http://hvyhfrijavkm.com/]hvyhfrijavkm[/url], [lin... | 182 | [
"spam"
] | {
"A": "They're probing your site. First, whether the comment will be published. Second, note how they use several popular syntaxes for links - it's an attempt to check which of them will result in an actual HTML link. If your site lets those posts through, expect more spam, this time more malicious.",
"B": "TL;DR ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/56863/what-is-the-purpose-of-gibberish-comments-posted-to-my-blog |
medicine_410 | medicine | Do zinc lozenges really help the common cold? | For years I've been seeing advertisements for zinc supplements for the common cold, and I've heard recommendations from people who swear that they work, either wiping out a cold completely or shortening its duration. The studies I have seen were for zinc gluconate specifically. Apparently, once they had a nasal spray t... | 25 | [
"treatment",
"common-cold"
] | {
"A": "Overall, there has been inconsistent data on the effects of using zinc lozenges to treat the common cold. Most studies have also been done on children, which may lead to more uncertainty about its effects on adults, but some of the studies I will mention have been tested on adults. One study showed the effect... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/410/do-zinc-lozenges-really-help-the-common-cold |
engineering_7245 | engineering | What material is used to hold molten iron in a furnace? | When iron is melted, I guess it has to be transported and contained. I think the container in which it is has to be able to withstand higher temperatures than what you want to melt. According to this webiste , "Iron, Wrought" has a melting temperature of 1482 - 1593 °C. There are a couple of other metals which have hig... | 20 | [
"metallurgy"
] | {
"A": "Please note : I'm not a building designer by trade, but I have had to investigate related questions for other reasons. I'll let you in on a dirty secret about sanitation lines within buildings - The biggest concern is not about how fast things are flying, it's about maintaining air pressure and providing adeq... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/7245/what-material-is-used-to-hold-molten-iron-in-a-furnace |
law_51213 | law | Can a soldier refuse to carry a weapon? | During WWII, Desmond Doss joined the US Army as a combat medic. Due to his religious belief in nonviolence, he refused to carry a weapon and was eventually allowed to do so, going on to win various medals (including the Medal of Honor) for rescuing casualties in various battles of the Pacific Theatre—his story was late... | 39 | [
"united-states",
"united-kingdom",
"legal-history",
"military"
] | {
"A": "In the UK Armed Forces, conscientious objection is grounds for a refusal at the admission stage and has been since the end of conscription in 1963. Where a person develops an objection to military service during their term of service, they have the option to appeal for a discharge. Interestingly there's no pr... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/51213/can-a-soldier-refuse-to-carry-a-weapon |
cybersecurity_143442 | cybersecurity | What are ssh-keygen best practices? | Most users would simply type ssh-keygen and accept what they're given by default. But what are the best practices for generating ssh keys with ssh-keygen ? For example: Use -o for the OpenSSH key format rather than the older PEM format (OpenSSH 6.5 introduced this feature years ago on 2014-01-30 ) (no longer needed sin... | 299 | [
"encryption",
"ssh",
"key-generation",
"openssh"
] | {
"A": "No, this is not a good practice. There are two distinct problems. encrypting the password instead of hashing it is a bad idea and is borderline storing plain text passwords. The whole idea of slow hash functions is to thwart the exfiltration of the user database. Typically, an attacker that already has access... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/143442/what-are-ssh-keygen-best-practices |
law_33056 | law | What is the meaning of “and subject to the jurisdiction thereof” in the 14th amendment? | In the fourteenth amendment, what does the phrase “and subject to the jurisdiction thereof” contribute? What people born in the United States would not have been subject to the jurisdiction of the United States? All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens ... | 56 | [
"us-constitution",
"fourteenth-amendment"
] | {
"A": "Trump was an officer of the government, and Twitter wasn't. The First Amendment forbids the government and its agents from viewpoint discrimination, but private companies are not bound by it and can discriminate as much as they please. (There was a question as to whether such discrimination might affect wheth... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/33056/what-is-the-meaning-of-and-subject-to-the-jurisdiction-thereof-in-the-14th-ame |
law_84554 | law | Why do lawyers write contracts with language that is more difficult to understand than other works? | The recent Ig Nobel Prize Winning work "Poor writing, not specialized concepts, drives processing difficulty in legal language" by Martínez, Mollica, and Gibson demonstrates that contracts are written in language that is harder to understand than other genres such as academic or media writing. In particular, center-emb... | 51 | [
"contract-law",
"lawyer",
"legal-writing"
] | {
"A": "Through the legal doctrine of \"transferred intent\", wherein if one intends to murder A, and undertake actions to kill A, but one's actions kill B, one has murdered B. Whatever crimes one would have committed, had one performed them on one's intended target, are considered committed against the individual on... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/84554/why-do-lawyers-write-contracts-with-language-that-is-more-difficult-to-understan |
cybersecurity_34972 | cybersecurity | What's the rationale behind Ctrl-Alt-Del for login | Why is Ctrl + Alt + Del required at login on certain Windows systems (I have not seen it elsewhere, but contradict me if I'm wrong) before the password can be typed in? From a usability point of view, it's a bad idea as it's adding an extra step in getting access. Does it improve security in any way, and if so, how? | 299 | [
"authentication",
"windows",
"password-management"
] | {
"A": "Maybe the lesson for children should be less about how to use tools to manage a password, and more about understanding why managing passwords is important? Let them write their passwords in a notebook. Have fun with devising a method for obfuscation in case the notebook is lost. Teach them about backups- keep... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/34972/whats-the-rationale-behind-ctrl-alt-del-for-login |
cybersecurity_211 | cybersecurity | How to securely hash passwords? | If I hash passwords before storing them in my database, is that sufficient to prevent them being recovered by anyone? I should point out that this relates only to retrieval directly from the database, and not any other type of attack, such as bruteforcing the login page of the application, keylogger on the client, and ... | 947 | [
"appsec",
"cryptography",
"passwords",
"hash"
] | {
"A": "Google uses BSSID information from your WLAN Access Point to get an approximation of where you are located, even with GPS and WiFi turned off . Taken from “How does Google Maps estimate my location without GPS?” : Google and others like Apple and Skyhook build a Database which links WLAN BSSIDs to a geographi... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/211/how-to-securely-hash-passwords |
law_81811 | law | Is it legal to break into a locked car to get a child out in hot weather? | The NHTSA's page about heat stroke in cars seems to imply that if you see a child left in a locked car on a hot day, you should break into the car to get the child out. "If you see a child alone in a locked car, get them out immediately and call 911." The only way to "get them out" of a "locked car" would be to break i... | 35 | [
"united-states",
"oregon"
] | {
"A": "While there is an act that President Trump and his supporters are citing, titled the Presidential Records Act (PRA) , to accuse House Speaker Pelosi of breaking federal law, it is important to understand what actions the law accounts for. The act mandates that the President of the United States preserve recor... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/81811/is-it-legal-to-break-into-a-locked-car-to-get-a-child-out-in-hot-weather |
cybersecurity_170481 | cybersecurity | How secure is Chrome storing a password? | Whenever I enter a login into a new site, Chrome asks me if it should store the login details. I used to believe this was fairly secure. If someone found my computer unlocked, they could get past the login screen for some website using the stored details, but if asked for the password again like during checkout, or if ... | 142 | [
"encryption",
"passwords",
"chrome"
] | {
"A": "Chrome not only stores your password text, it will show it to you. Under settings -> advanced -> manage passwords you can find all your passwords for all your sites. Click show on any of them and it will appear in the clear. Hashed passwords work for the site authenticating you. They are not an option for pas... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/170481/how-secure-is-chrome-storing-a-password |
law_4483 | law | Can an employer withhold pay for a fire drill? | Moved from WorkplaceSE . Recently there was a routine fire drill in an office building. As with most fire drills, it took about half an hour for the fire drill to complete and for everyone to get back to work. When the employees got back to their desks, they were told to charge 30 minutes of time to an overhead charge ... | 57 | [
"united-states",
"employment"
] | {
"A": "This seems to fall under the Federal Fair Labor Standards Act, and is defined as \"waiting time.\" From Employment Law Handbook : On-duty waiting time should be counted as hours worked. It is time spent by an employee, typically during normal work hours, waiting for direction from their team lead, supervisor,... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/4483/can-an-employer-withhold-pay-for-a-fire-drill |
finance_148 | finance | What is the role of stochastic calculus in day-to-day trading? | I work with practical, day-to-day trading: just making money. One of my small clients recently hired a smart, new MFE. We discussed potential trading strategies for a long time. Finally, he expressed surprise that I never mentioned (much less used) stochastic calculus, which he spent many long hours studying in his MFE... | 33 | [
"differential-equations",
"stochastic-calculus"
] | {
"A": "Martingales + Markovian Here is the motivation. Conditional expectations are martingales by the tower property of conditional expectations (an easy exercise to show). Suppose $r=0$, by the risk neutral pricing theorem $E^\\star\\left[h(X_T)\\bigg|\\mathscr{F}_t,\\,X_t=x\\right]$ is the price of any derivative... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/148/what-is-the-role-of-stochastic-calculus-in-day-to-day-trading |
cybersecurity_55116 | cybersecurity | How exactly does the OpenSSL TLS heartbeat (Heartbleed) exploit work? | I've been hearing more about the OpenSSL Heartbleed attack , which exploits some flaw in the heartbeat step of TLS. If you haven't heard of it, it allows people to: Steal OpenSSL private keys Steal OpenSSL secondary keys Retrieve up to 64kb of memory from the affected server As a result, decrypt all traffic between the... | 224 | [
"openssl",
"heartbleed"
] | {
"A": "You are touching a sore point… Historically , computers were mainframes where a lot of distinct users launched sessions and process on the same physical machine. Unix-like systems (e.g. Linux), but also VMS and its relatives (and this family includes all Windows of the NT line, hence 2000, XP, Vista, 7, 8...)... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/55116/how-exactly-does-the-openssl-tls-heartbeat-heartbleed-exploit-work |
cybersecurity_170388 | cybersecurity | Do I need CSRF token if I'm using Bearer JWT? | Context : Angular site is hosted on S3 behind CloudFront, separate from Express server that is used as API and almost all requests are XMLHttpRequests. All requests are sent without cookies (withCredentials = false by default) and I use JWT Bearer token for authentication by taking it from cookies in angular and placin... | 136 | [
"cookies",
"csrf",
"node.js",
"angularjs"
] | {
"A": "This is relevant but doesn't necessarily answer 100% of your question: https://security.stackexchange.com/a/166798/149676 The short of it is that as long as authentication isn't automatic (typically provided by the browser) then you don't have to worry about CSRF protection. If your application is attaching t... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/170388/do-i-need-csrf-token-if-im-using-bearer-jwt |
cybersecurity_12332 | cybersecurity | Where to store a server side encryption key? | I have some data that is symmetrically encrypted with a single key in my database. Rather than hard coding it into my code, I am looking for a safer way to store the encryption key. Where can I safely store it? | 176 | [
"encryption",
"key-management"
] | {
"A": "Here are your possibilities, roughly in decreasing order of sophistication. Use an external Hardware Security Module. There is an entire industry of products designed for offloading security-sensitive operations to external devices. This doesn't solve the problem so much as relocate it, but it relocates it to... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/12332/where-to-store-a-server-side-encryption-key |
engineering_12453 | engineering | Windmills in empty fields. Why no trees? | I have noticed that windmills are generally built in empty fields with no trees around, and I've been wondering why... A windmill is generally way taller than trees and I can imagine that trees don't actually affect the flow (see picture). But is this the reason why there is nothing around or is there something else th... | 20 | [
"mechanical-engineering",
"fluid-mechanics",
"thermodynamics",
"heat-transfer"
] | {
"A": "Trees increase the turbulence of the air that reaches the turbines. That creates all sorts of uneven, rapidly-shifting loads on the blades and structure. That increases the maintenance costs, decreases availability, decreases the capacity factor, and decreases the life expectancy of the turbine. So, higher co... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/12453/windmills-in-empty-fields-why-no-trees |
law_37252 | law | Is it illegal to infringe copyright if your boss or your client ordered you to do it? | The first possible scenario is this: suppose you work in a company, and you need to install some software for a client. The software needs to be purchased, but the boss tells you to just download it for free illegally (infringing copyright). You tell your boss that of course that's illegal and it's not the best way to ... | 49 | [
"united-states",
"copyright",
"european-union",
"liability",
"workplace"
] | {
"A": "You don't know. You can't know. And you can't force the officer to tell you. Detention Status As a practical matter, you have no way of knowing if you are compelled to follow an officer's order because you are being detained unless the officer volunteers that information (your detention status) which they are... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/37252/is-it-illegal-to-infringe-copyright-if-your-boss-or-your-client-ordered-you-to-d |
finance_6988 | finance | How do we use option price models (like Black-Scholes Model) to make money in practice? | In quantitative finance, we know we have a lot of option price models such as geometric Brownian motion model (Black-Scholes models), stochastic volatility model (Heston), jump diffusion models and so on, my question is how can we use these models to make money in practice? My comments: Because we can read option price... | 35 | [
"option-pricing",
"black-scholes",
"models"
] | {
"A": "In order to answer your question (for you) you would need something to compare to . You would need numbers to know if it is slower/faster, how much, and if it will impact your system overall. Also knowing your performance goals could narrow down the options. My advice is to take a look at your overall archite... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/6988/how-do-we-use-option-price-models-like-black-scholes-model-to-make-money-in-pr |
law_94333 | law | Is it legal for a train company to create an art gallery using photographs of the graffiti on their locomotives and train cars? | I have been wondering that since a train company owns its locomotives and train cars, then I am assuming that this means that they own any graffiti that has been painted on their locomotives and train cars. I have recently read that it is illegal for someone to put graffiti on any train company equipment, since it is a... | 37 | [
"united-states",
"copyright",
"intellectual-property",
"business",
"property"
] | {
"A": "Yes, their waiver has no legal basis and is invalid under the GDPR. They should have hired a better lawyer. GDPR rights cannot be waived ( mrllp.com ). The last bit should have been: Therefore, in consideration of my participation in any project, I understand that retaining my name and email address, as descr... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/94333/is-it-legal-for-a-train-company-to-create-an-art-gallery-using-photographs-of-th |
law_15190 | law | What power do I have as a driver if my interstate route is blocked by a protest? | I recently read about protests blocking an interstate. I feel like ethically no one no (non-police) citizen has the right to obstruct my travel (on a public interstate for the sake of protest), therefore I'm interested to know if I personally have any legal route to retaliate against the individuals stopping my travel ... | 62 | [
"united-states",
"travel"
] | {
"A": "Your question is the subject of longstanding and ongoing debate that has generated countless articles and books and dissertations, so you're probably not going to get a fully satisfactory answer here. But here's the short version: Different systems operate on different assumptions. Your question suggests you ... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/15190/what-power-do-i-have-as-a-driver-if-my-interstate-route-is-blocked-by-a-protest |
law_73444 | law | What happens to a country’s debt if the country ends? | Suppose a country either just calls it quits or is destroyed by war (for example, Yugoslavia or Czechoslovakia). If that country has a national debt, including both domestic and foreign lenders, what happens to the debt? I have read about countries going bankrupt and the complex and varied processes used to address thi... | 34 | [
"international",
"debt"
] | {
"A": "If the country was defeated in war, the bondholders often lose all their money. Sometimes, though, the conqueror has its own reasons to want the debt to be repaid. If the country came to an end through peaceful negotiation, the same negotiation would decide who becomes responsible for its debts. So, at the en... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/73444/what-happens-to-a-country-s-debt-if-the-country-ends |
law_30946 | law | Do we have to take down the material for 14 days even if the DMCA notice is erroneous? | A very large site and my site are both licensed to use product images created and photographed by the same vendor. Now the large site comes after my site and sends a DMCA notice to my hosting provider, asking us to take down quite some of our most popular products. While it's absolutely a false claim and it's possible ... | 46 | [
"copyright",
"dmca"
] | {
"A": "While there is an act that President Trump and his supporters are citing, titled the Presidential Records Act (PRA) , to accuse House Speaker Pelosi of breaking federal law, it is important to understand what actions the law accounts for. The act mandates that the President of the United States preserve recor... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/30946/do-we-have-to-take-down-the-material-for-14-days-even-if-the-dmca-notice-is-erro |
engineering_486 | engineering | Measuring longer distances with high accuracy | I am involved right now in the fabrication of steel structures on the order of 5-50 feet long. Presently, we measure these structures with garden variety commercial tape measures. Most of the time, we work to a tolerance of about +/-1/16" and don't have any problems. Recently, we're trying to make some items to a very ... | 13 | [
"measurements",
"tolerance",
"manufacturing-engineering",
"surveying"
] | {
"A": "Answering the question: What are possible types of low cost sensors I can use? There are several types of sensors that can provide millimeter level accuracy. \"Low cost\" is a very relative term, so you'll need to do some shopping around based on your specific budget. Optical sensors- Included here are those ... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/486/measuring-longer-distances-with-high-accuracy |
law_89019 | law | At what point is it "legal" to overthrow the government? | It has been argued that the point of the 2nd amendment is to overthrow a tyrannical government. In the Declaration it states that “whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government.” At what point "Legally", are we... | 34 | [
"united-states",
"us-constitution"
] | {
"A": "There isn't any indication in that news story that the disabled son was anywhere nearby. I agree the situation you describe sounds like a legitimate use of the placard, but it seems in this situation, the placard was being used in a manner totally unrelated to the transport of a disabled person. My guess is t... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/89019/at-what-point-is-it-legal-to-overthrow-the-government |
cybersecurity_181580 | cybersecurity | Why is Math.random() not designed to be cryptographically secure? | The JavaScript Math.random() function is designed to return a single IEEE floating point value n such that 0 ≤ n not cryptographically secure. Most modern implementations use the XorShift128+ algorithm which can be easily broken . As it is not at all uncommon for people to mistakenly use it when they need better random... | 246 | [
"cryptography",
"javascript",
"random"
] | {
"A": "I was one of the implementers of JScript and on the ECMA committee in the mid to late 1990s, so I can provide some historical perspective here. The JavaScript Math.random() function is designed to return a floating point value between 0 and 1. It is widely known (or at least should be) that the output is not ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/181580/why-is-math-random-not-designed-to-be-cryptographically-secure |
law_106488 | law | Why is it considered terrorism to murder a CEO? | According to this article , Luigi Mangione got charged with terrorism for murdering the CEO. I am not sure why this murder can - under US law - be considered an act of terrorism. Here is a relevant page from NY penal law that defines terrorism: A person is guilty of a crime of terrorism when, with intent to intimidate ... | 36 | [
"united-states",
"murder",
"terrorism"
] | {
"A": "Why it is considered as terrorism to murder a CEO? It's not, as such. That is, CEOs do not have special status under New York or Federal law that would inherently make murdering them terroristic. Brian Thompson having been a CEO is not directly relevant to Mangione being charged with terrorism. I doubt that m... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/106488/why-is-it-considered-terrorism-to-murder-a-ceo |
finance_942 | finance | Any known bugs with Yahoo Finance adjusted close data ? | Yahoo Finance allows you to download tables of their daily historical stock price data. The data includes an adjusted closing price that I thought I might use to calculate daily log returns as a first step to other kinds of analyses. To calculate the adj. close you need to know all the splits and dividends, and ex-div ... | 33 | [
"data",
"equities",
"adjustments",
"yahoo"
] | {
"A": "Yahoo rounds the adjusted price to 2 decimals even though dividend amounts often have 3 decimal places. Since they apply the adjustment formula to adjusted prices, if you go far enough back in time, the value they give for Adjusted Price will be different than it would be if there were no rounding. edit: For ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/942/any-known-bugs-with-yahoo-finance-adjusted-close-data |
law_59878 | law | Can you legally move a dead body to preserve it as evidence? | A fisherman is heading upstream in his boat, and sees a human corpse float past. Obviously even if it wasn't murder, it still warrants a 911 call because it was a death. The river however, is steadily moving the body away. Can the fisherman move the body and avoid legal jeopardy because the intent was to preserve it as... | 40 | [
"united-states",
"criminal-law",
"murder",
"investigation"
] | {
"A": "at what point can you just leave? Is it always technically illegal in the UK to leave without paying the bill? Probably depends on what you mean with just leaving. If just leaving translates I haven't paid and I won't pay (because of the hassle with the card) then that's probably Making Off Without Payment, s... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/59878/can-you-legally-move-a-dead-body-to-preserve-it-as-evidence |
cybersecurity_51959 | cybersecurity | Why are salted hashes more secure for password storage? | I know there are many discussions on salted hashes, and I understand that the purpose is to make it impossible to build a rainbow table of all possible hashes (generally up to 7 characters). My understanding is that the random salted values are simply concatenated to the password hash. Why can a rainbow table not be us... | 259 | [
"passwords",
"cryptography",
"hash",
"salt",
"rainbow-table"
] | {
"A": "\"If lack of encryption allows FBI to catch terrorists, then lack of encryption allows criminals to loot your emails and plunder your bank account.\" The rational point here is that technology is morally neutral. Encryption does not work differently depending on whether the attacker is morally right and the d... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/51959/why-are-salted-hashes-more-secure-for-password-storage |
finance_85 | finance | Are there any new Option pricing models? | Back in the mid 90's I used the Black-Scholes Model and the Cox-Ross-Rubenstein (Binomial) Model's to price Options. That was nearly 15 years ago and I was wondering if there are any new models being used to price Options? | 50 | [
"black-scholes",
"option-pricing"
] | {
"A": "Black-Scholes itself didn't change a lot but we can now adjust it to deal with a lot more complicated factors to price more complicated contracts: stochastic volatility (Heston, Gatheral) stochastic rates (Hull) credit risk dividends Other methods (computing intensive) have also evolved to deal with various t... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/85/are-there-any-new-option-pricing-models |
cybersecurity_94783 | cybersecurity | Why is my internal IP address (private) visible from the Internet? | When visiting some websites like http://www.monip.org or http://ip-api.com , I get the following result: Your current IP Address - IP: 197.158.x.x - Internal IP: 192.168.x.x I understand that I can see my public IP address (197.158.x.x). What I can't figure out is that how come my internal IP address is visible through... | 132 | [
"ip"
] | {
"A": "Disclaimer: I am the author, creator, owner and maintainer of Have I Been Pwned and the linked Pwned Passwords service. Let me clarify all the points raised here: The original purpose of HIBP was to enable people to discover where their email address had been exposed in data breaches. That remains the primary... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/94783/why-is-my-internal-ip-address-private-visible-from-the-internet |
medicine_312 | medicine | When does the use of headphones become harmful? | Generally, it is known if you listen to music through headphones a lot of time, you damage your ears. But how long should I use the headphones? And how loud can they be so as not to affect my hearing? | 26 | [
"hearing"
] | {
"A": "Most dentists - for most procedures - aim for a painless experience. If there is reason to keep some pain sensation intact, the dentist will inform you, and ask at appropriate intervals if you can feel pain. The efficacy of lidocaine and other local anesthetics depends on how closely your nerve distribution c... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/312/when-does-the-use-of-headphones-become-harmful |
engineering_3450 | engineering | What is the purpose of these "steps" in rivers? | I have seen a number of structures within rivers, which resemble steps, and which allow the water to cascade down them instead of flowing naturally down the course of the river. Example 1: River Avon in Bath Example 2: River Seine in Paris (from Les Miserables (2012)) What is the purpose of these structures? | 24 | [
"civil-engineering",
"hydrology",
"flow-control"
] | {
"A": "The two photos in the post show the same structure: Pulteney Weir , downstream of Pulteney Bridge on the River Avon in Bath. The shot of the \"Seine\" in Les Miserables was filmed on location in Bath. Pulteney Weir was designed by architect Neville Conder , and built between 1968 and 1972. It's one component ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/3450/what-is-the-purpose-of-these-steps-in-rivers |
cybersecurity_19911 | cybersecurity | CRIME - How to beat the BEAST successor? | With the advent of CRIME, BEAST's successor , what possible protection is available for an individual and/or system owner in order to protect themselves and their users against this new attack on TLS? | 313 | [
"tls",
"exploit",
"defense"
] | {
"A": "This attack is supposed to be presented 10 days from now, but my guess is that they use compression . SSL/TLS optionally supports data compression. In the ClientHello message, the client states the list of compression algorithms that it knows of, and the server responds, in the ServerHello , with the compress... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/19911/crime-how-to-beat-the-beast-successor |
cybersecurity_126932 | cybersecurity | How secure is 'blacking out' sensitive information using MS Paint? | I'm wondering if it's safe to black out sensitive information from a picture just by using Microsoft Paint ? Let's take in this scenario that EXIF data are stripped and there is no thumbnail picture, so that no data can be leaked in such a way. But I'm interested in whether there is any other attack, that can be used i... | 204 | [
"forensics",
"data-leakage",
"image"
] | {
"A": "This is actually an interesting new field in infosec— reputation management . Employers, Law Enforcement and other government agencies, legal professionals, the press, criminals and others with an interest in your reputation will be observing all online activity associated with your real name. These \"interes... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/126932/how-secure-is-blacking-out-sensitive-information-using-ms-paint |
cybersecurity_22711 | cybersecurity | Is it a bad idea for a firewall to block ICMP? | This question was inspired by this answer which states in part: The generic firewall manifest file finishes off by dropping everything I didn't otherwise allow (besides ICMP. Don't turn off ICMP). But, is it truly a good practice for a firewall to allow ICMP? What are the security implications, and are there cases wher... | 133 | [
"network",
"firewalls",
"icmp"
] | {
"A": "TL;DR - You can store the salt in plaintext without any form of obfuscation or encryption, but don't just give it out to anyone who wants it. The reason we use salts is to stop precomputation attacks, such as rainbow tables . These attacks involve creating a database of hashes and their plaintexts, so that ha... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/22711/is-it-a-bad-idea-for-a-firewall-to-block-icmp |
cybersecurity_23383 | cybersecurity | SSH key-type, rsa, dsa, ecdsa, are there easy answers for which to choose when? | As someone who knows little about cryptography, I wonder about the choice I make when creating ssh-keys. ssh-keygen -t type , where type is either of dsa,rsa and ecdsa. Googling can give some information about differences between the types, but not anything conclusive. So my question is, are there any "easy" answers fo... | 198 | [
"ssh",
"key-generation"
] | {
"A": "In practice, a RSA key will work everywhere. ECDSA support is newer, so some old client or server may have trouble with ECDSA keys. A DSA key used to work everywhere, as per the SSH standard ( RFC 4251 and subsequent), but this changed recently: OpenSSH 7.0 and higher no longer accept DSA keys by default. ECD... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/23383/ssh-key-type-rsa-dsa-ecdsa-are-there-easy-answers-for-which-to-choose-when |
engineering_214 | engineering | Can we change steel properties by application of magnetic field while quenching? | Austenite is non magnetic while $\alpha$-ferrite and pearlite are magnetic . ( Magnetic properties of pearlite vary as a function of carbon content ) If a strong magnetic field is applied in a particular direction while the steel is being quenched (rather, austenite is being quenched!), would the grain structure change... | 19 | [
"steel",
"process-engineering",
"materials",
"metallurgy",
"magnets"
] | {
"A": "This will at least depend on the: Rate of Cooling Magnetic field strength Exact composition The magnetic field will alter the microstructure as you can read in, for example, Yudong Zhang, Nathalie Gey, Changshu He, Xiang Zhao, Liang Zuo, Claude Esling, High temperature tempering behaviors in a structural stee... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/214/can-we-change-steel-properties-by-application-of-magnetic-field-while-quenching |
cybersecurity_379 | cybersecurity | What are rainbow tables and how are they used? | Where can I find one? Is there a pot of gold at the end? How do I protect against them? From the Area51 proposal This question was IT Security Question of the Week . Read the Sep 09, 2011 blog entry for more details or submit your own Question of the Week. | 168 | [
"cryptography",
"hash",
"attacks",
"attack-prevention",
"rainbow-table"
] | {
"A": "Rainbow Tables are commonly confused with another, simpler technique that leverages a compute time-storage tradeoff in password recover: hash tables. Hash tables are constructed by hashing each word in a password dictionary. The password-hash pairs are stored in a table, sorted by hash value. To use a hash ta... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/379/what-are-rainbow-tables-and-how-are-they-used |
cybersecurity_171055 | cybersecurity | How did Google know I looked something up? | Yesterday I was searching DuckDuckGo for booking a vacation. I ended up reading a lot on one specific website. Today multiple websites show me Google banners from this specific website. Normally, I never look up websites for booking a vacation. I use DuckDuckGo on purpose, to prevent these kind of things. My question t... | 135 | [
"privacy",
"google"
] | {
"A": "Diffie-Hellman is a way of generating a shared secret between two people in such a way that the secret can't be seen by observing the communication. That's an important distinction: You're not sharing information during the key exchange, you're creating a key together. This is particularly useful because you ... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/171055/how-did-google-know-i-looked-something-up |
finance_8247 | finance | Why Drifts are not in the Black Scholes Formula | This question has puzzled me for a while. We all know geometric brownian motions have drifts $\mu$: $dS / S = \mu dt + \sigma dW$ and different stocks have different drifts of $\mu$. Why would the drifts go away in Black Scholes? Intuitively, everything else being equal, if a stock has higher drift, shouldn't it have h... | 55 | [
"options",
"option-pricing",
"black-scholes",
"risk-neutral-measure"
] | {
"A": "In general there are two basic ways to make money out of your option pricing models: Sell side (market maker, risk neutral): You use these models to calculate your greeks to hedge your portfolio, so that you live on the spread. Buy side (market/risk taker): You use your model to find mispriced options in the ... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/8247/why-drifts-are-not-in-the-black-scholes-formula |
finance_1891 | finance | How much data is needed to validate a short-horizon trading strategy? | Suppose one has an idea for a short-horizon trading strategy, which we will define as having an average holding period of under 1 week and a required latency between signal calculation and execution of under 1 minute. This category includes much more than just high-frequency market-making strategies. It also includes s... | 51 | [
"data",
"time-series",
"backtesting",
"quant-trading-strategies",
"arbitrage"
] | {
"A": "I have worked on this topic extensively (pricing and calculating IV in production) and believe can offer an informed opinion. First of all Mathworks - the company that creates Matlab is not a trading firm so you should probably not rely on their advice so much. There are few closed form options pricing models... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/1891/how-much-data-is-needed-to-validate-a-short-horizon-trading-strategy |
engineering_38920 | engineering | How does turning off electric appliances save energy | We all know if we use less electricity we save energy. But the energy we're getting is result of burning (not necessarily the literal meaning) the fuel. Even if we don't use that energy that fuel is gone forever. (Except saving money on bills) My questions Am I wrong in above statement? If yes then how does actually el... | 22 | [
"power",
"energy",
"power-engineering",
"fuel-economy"
] | {
"A": "Electricity production optimization is a very complex subject. It is also affected by many parameters , which I will try to outline below. TL;DR: Demand is constantly monitored and supply is constantly adjusted TL;DR 2: Lshaver's excellent post is a suggested reading after reading this, because it expands and... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/38920/how-does-turning-off-electric-appliances-save-energy |
engineering_1718 | engineering | What does "$\pm$ 0.5% F.S." mean? | I've seen it in several data sheets - it is a measure of error of some kind, of course. The problem is I dont know the exact meaning. I've seen it in the context of repeatability, accuracy and linearity. An example is the following data sheet: smc data sheet (On page 3) | 12 | [
"nomenclature"
] | {
"A": "The picture, below, of the exaggerated long section of the Channel Tunnel was taken from Wikipedia . Full-sized image here . Some of the limiting factors for the Channel Tunnel are: Railways don't like steep gradients The tunnels comprising the Channel Tunnel were excavated using tunnel boring machines (TBMs)... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/1718/what-does-pm-0-5-f-s-mean |
cybersecurity_214492 | cybersecurity | Password management for kids - what's a good way to start? | Consider a young (primary-school age) child who is starting to collect passwords for online services. How can a parent (or equivalent) help them manage their passwords? An example to make things clearer: My daughter might want to log on to http://scratch.mit.edu from several locations/devices to show her projects to th... | 170 | [
"password-management"
] | {
"A": "Bcrypt has the best kind of repute that can be achieved for a cryptographic algorithm: it has been around for quite some time, used quite widely, \"attracted attention\", and yet remains unbroken to date. Why bcrypt is somewhat better than PBKDF2 If you look at the situation in details, you can actually see s... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/214492/password-management-for-kids-whats-a-good-way-to-start |
cybersecurity_214814 | cybersecurity | Why can I log in to my Facebook account with a misspelled email/password? | I've been playing around with different login forms online lately to see how they work. One of them was the Facebook login form. When I logged out of my account my email and password were autocompleted by my browser. Then I decided to misspell my email and see what would happen if I tried to log in. To my surprise I lo... | 561 | [
"authentication",
"account-security",
"facebook"
] | {
"A": "If you are concerned about the privacy of your password and thus your account (which should be the case), you should try to educate the customer service. The developer FAQ from the public shaming project for this kind of recklessness lists a few good points and is worth a read. Also, you should point out that... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/214814/why-can-i-log-in-to-my-facebook-account-with-a-misspelled-email-password |
cybersecurity_53481 | cybersecurity | Does Facebook store plain-text passwords? | I was about to reset my Facebook password and got this error: Your new password is too similar to your current password. Please try another password. I assumed that Facebook stores only password hashes, but if so, how can they measure passwords similarity? This should be impossible with good hashing function, right? Qu... | 190 | [
"passwords",
"hash",
"facebook"
] | {
"A": "Let's hope and assume that Facebook stores only hashes of current password (and potentially previous passwords). Here is what they can do: user sets first password to \"first\" and fb stores hash(\"first\"). later on, users resets password and is asked to provide new password \"First2\" Facebook can generate ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/53481/does-facebook-store-plain-text-passwords |
law_73571 | law | If I cause a crash can I delete my dash cam footage? | If I am driving a car and get into a crash that is 100% my fault can I rip my dash cam down and delete the footage or completely refuse to give the footage to anyone or am I legally required to provide that footage? | 34 | [
"accident",
"accident-insurance"
] | {
"A": "As an example, under the laws of Colorado, USA, deleting the footage would be a crime. See CRS 18-8-610 : A person commits tampering with physical evidence if, believing that an official proceeding is pending or about to be instituted and acting without legal right or authority, he: (a) Destroys, mutilates, c... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://law.stackexchange.com/questions/73571/if-i-cause-a-crash-can-i-delete-my-dash-cam-footage |
cybersecurity_172212 | cybersecurity | How do mobile carriers know video resolution over HTTPS connections? | Verizon is modifying their "unlimited" data plans. Customers in the USA can stream video at 480p -or- pay to unlock higher resolutions (both 720p and +1080p). They are not the only mobile carrier to implement rules like this . If I am on a site that implements HTTPS for video streaming, say YouTube or Facebook, how do ... | 204 | [
"encryption",
"tls",
"cellular"
] | {
"A": "It typically works like this: Say your password is \"baseball\". I could simply store it raw, but anyone who gets my database gets the password. So instead I do an SHA1 hash on it, and get this: $ echo -n baseball | sha1sum a2c901c8c6dea98958c219f6f2d038c44dc5d362 Theoretically it's impossible to reverse a SH... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/172212/how-do-mobile-carriers-know-video-resolution-over-https-connections |
cybersecurity_115461 | cybersecurity | I found unknown PHP code on my server. How do I de-obfuscate the code? | We've been getting a lot of noise regarding hacked PHP files here, and it's taking a lot of time to answer these questions. In many cases, they are off-topic. We've had a discussion about this on Information Security Meta, and many people want these posts to stay. However, nearly every single post about obfuscated PHP ... | 164 | [
"php",
"incident-response",
"obfuscation",
"websites"
] | {
"A": "Fortunately, almost all PHP scripts can be deobfuscated with 4 simple methods. We're going to use these four methods to create a canonical answer. Before we begin, let's collect a list of common tools that assist in deobfuscating these malicious files so we can do the work ourselves. Common tools that aid in ... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/115461/i-found-unknown-php-code-on-my-server-how-do-i-de-obfuscate-the-code |
finance_121 | finance | How do you evaluate a covariance forecast? | Suppose you have two sources of covariance forecasts on a fixed set of $n$ assets, method A and method B (you can think of them as black box forecasts, from two vendors, say), which are known to be based on data available at a given point in time. Suppose you also observe the returns on those $n$ assets for a following... | 23 | [
"forecasting",
"statistics",
"covariance"
] | {
"A": "This isn't really an answer, but it's too long to add as a comment. I've always had a real problem with the correlation/covariance of price . To me, it means nothing. I realize that it gets used (abused) in many contexts, but I just don't get anything out of it (over time, price has to generally go up, go dow... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/121/how-do-you-evaluate-a-covariance-forecast |
finance_27674 | finance | What is the most stable, non-trivial dependence structure in finance? | The highest rated answer to the question on What concepts are the most dangerous ones in quantitative finance work? is this one: Correlation Correlations are notoriously unstable in financial time series [...] My question My question is a little bit broader than just about linear dependence, it is: What is the most sta... | 23 | [
"finance",
"correlation",
"dependence"
] | {
"A": "It is hard to find a stable non-trivial dependence structure in financial data. Usually when such is found it is hard to rationalize. One of my favorite (although I am sure there are others) is the so called \"Presidential Puzzle\". This is an old finding by Santa-Clara and Valkanov (2003) They find that \" E... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/27674/what-is-the-most-stable-non-trivial-dependence-structure-in-finance |
medicine_24071 | medicine | Why use a placebo in some potential COVID-19 vaccine trials? | With potential COVID-19 vaccine trials beginning around the globe, one vaccine approach is to induce the creation of antibodies in the participants. The first phase of the trial will check whether the vaccine candidate induces the creation of antibodies to kill the coronavirus that causes COVID-19, and whether it provo... | 14 | [
"covid-19",
"placebo"
] | {
"A": "Let's get a few things out of the way... Sex is normal ( 1 ). Sexual desire and arousal are normal ( 2 ). Asexuality is normal ( 3 ). Masturbation is normal ( 4 ),( 5 ). There is no problem whatsoever with these three things, although everyone blushes when they talk about them. Is Masturbation healthy? Downsi... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/24071/why-use-a-placebo-in-some-potential-covid-19-vaccine-trials |
cybersecurity_3272 | cybersecurity | Password Hashing: add salt + pepper or is salt enough? | Please Note: I'm aware that the proper method for secure password storage hashing is either scrypt or bcrypt. This question isn't for implementation in actual software, it's for my own understanding. Related How to apply a pepper correctly to bcrypt? How to securely hash passwords? HMAC - Why not HMAC for password stor... | 275 | [
"cryptography",
"passwords",
"hash",
"salt",
"hmac"
] | {
"A": "Given that this identification was likely performed according to German law, this request was to conform with BaFin Circular 3/2017 which demands (in their non-binding English translation): Any substitution/manipulation of parts or elements of the identity document must be countered by suitable measures. To t... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/3272/password-hashing-add-salt-pepper-or-is-salt-enough |
medicine_26 | medicine | Is there any health risk in cellular phones? | Cellular phones are taking ever increasing part in our lives, and I keep hearing people saying they are harmful to our health. Are there any scientific researches so far proving or disproving those claims? I found couple of semi-scientific articles: Is there any link between cellphones and cancer? which says: The possi... | 53 | [
"cancer",
"brain",
"cellular-phone",
"bioelectromagnetics",
"health-outcomes"
] | {
"A": "The IARC has concluded that cell phones are a \"possible carcinogen\" due to the amount of evidence going both directions. The gist of it is summarised on the website itself: Cell phones emit radiofrequency energy, a form of non-ionizing electromagnetic radiation, which can be absorbed by tissues closest to w... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/26/is-there-any-health-risk-in-cellular-phones |
finance_1628 | finance | What are the best sources for equity quantitative research? | What are the best sources of quantitative finance research in equities? I will list a couple and note an asterisk if the research is available by request (i.e. non-clients) or online: BAC-Merrill Lynch - Savita Subramanian Deutsche Bank - Yin Luo* Credit Suisse - Pankaj Patel Barclay's - Matthew Rothman HSBC - Ely Klep... | 28 | [
"quant-trading-strategies",
"equities",
"research"
] | {
"A": "The minimum variance solution loads up on securities that have low variances and co-variances. Theoretically you are correct that this should have a low expected return profile. However, it turns out - in contradiction to modern portfolio theory - that securities that have low-volatility or low-beta experienc... | B | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://quant.stackexchange.com/questions/1628/what-are-the-best-sources-for-equity-quantitative-research |
engineering_336 | engineering | Which turbulence models are suitable for CFD analysis on a streamlined vehicle body? | Many commercial and open-source CFD codes implement several closure methods for the non-linear convective acceleration term of the Reynolds-averaged Navier-Stokes (RANS) equations. Common methods (also known as turbulence models ) include Spalart–Allmaras (S–A) k–ε (k–epsilon) k–ω (k–omega) SST (Menter’s Shear Stress T... | 13 | [
"mechanical-engineering",
"fluid-mechanics",
"fluid-dynamics",
"simulation",
"modeling"
] | {
"A": "The turbulence model can make a big difference in your simulation . There are many turbulence models around. It becomes a tough job to select one out of them. There is no perfect turbulence model. It all depends on several parameters like Reynold's number, whether the flow is separated, pressure gradients, bo... | A | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/336/which-turbulence-models-are-suitable-for-cfd-analysis-on-a-streamlined-vehicle-b |
cybersecurity_45170 | cybersecurity | How safe are password managers like LastPass? | I use LastPass to store and use my passwords, so I do not have duplicate passwords even if I have to register four to five different accounts a day, and the passwords are long. How safe are password manager services like LastPass? Don't they create a single point of failure? They are very attractive services for hacker... | 206 | [
"passwords",
"password-management"
] | {
"A": "You are touching a sore point… Historically , computers were mainframes where a lot of distinct users launched sessions and process on the same physical machine. Unix-like systems (e.g. Linux), but also VMS and its relatives (and this family includes all Windows of the NT line, hence 2000, XP, Vista, 7, 8...)... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://security.stackexchange.com/questions/45170/how-safe-are-password-managers-like-lastpass |
engineering_2478 | engineering | Is stainless steel plating possible? | Is there a method for plating steel with stainless steel? If so, is it chemical, electrical, or electrochemical? I did a quick search on the internet but was unable to find a service. I'm interested in applying a food safe finish to something that would otherwise be cost prohibitive to make out of solid stainless steel... | 14 | [
"materials",
"steel"
] | {
"A": "It is more efficient to transmit DC using about the same infrastructure. This is because of several effects: Skin effect experienced with AC. There is no skin effect with DC. Higher voltage allowed with DC for the same transmission lines. The lines have to withstand the peak voltage. With AC, that is 1.4 time... | D | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://engineering.stackexchange.com/questions/2478/is-stainless-steel-plating-possible |
medicine_5226 | medicine | Why does the flu only happen in winter? | I can understand that our immune system may be weaker when we are cold (?), but since these viruses live inside a human body which internal temperature is constant over the year, why does the season make a difference? Moreover, we are never sick from the flu in summer, like it does not exist, yet the viruses reappear a... | 13 | [
"disease-transmission",
"influenza",
"weather",
"seasonal-allergies",
"air-temperature"
] | {
"A": "Your question contains a lot of misconceptions. A cure is definitely possible A cure could be found, proved, and proved safe, more quickly than a vaccine People and firms that could be working on cures are choosing to work on vaccines None of these are correct. Most virus-caused diseases have no cure: colds, ... | C | same_domain_answer_pool | stackexchange | CC-BY-SA 4.0 | https://medicalsciences.stackexchange.com/questions/5226/why-does-the-flu-only-happen-in-winter |
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