text large_stringlengths 148 17k | id large_stringlengths 47 47 | score float64 2.69 5.31 | tokens int64 36 7.79k | format large_stringclasses 13
values | topic large_stringclasses 2
values | fr_ease float64 20 157 |
|---|---|---|---|---|---|---|
Most Active Stories
- Dr. Paul Booth, DePaul University – Cultural Meaning of Doctor Who
- Where Did That Fried Chicken Stereotype Come From?
- Dr. Frank Elgar, McGill University – Psychological Health and Family Meals
- NY AG Breaks Cigarette Trafficking Ring, Hints Terror Ties
- Complaints Voiced At Forum About VA Cl... | <urn:uuid:6fa81ce2-e113-4b62-b1d9-827e097d21e6> | 2.984375 | 591 | Audio Transcript | Science & Tech. | 33.97866 |
Despite what science tells us about climate change, the world continues to pump carbon dioxide into the atmosphere. Last year, increases in emissions from rapidly growing economies like China and India offset reductions that richer countries have made. In short, the picture looks grim.
Some scientists think it’s best n... | <urn:uuid:595ed12d-0a81-4523-b95a-8f6d32867e91> | 3.078125 | 161 | Truncated | Science & Tech. | 53.193228 |
Arts, sciences and humanities build healthier, more livable, vital communities. They are essential to a strong education system. They contribute enormously to our economy.
Moths are typically neglected by people interested in natural history even though there are many hundreds of colorful and interesting species that l... | <urn:uuid:01c38d28-4173-4f7e-8eb2-0df3fbe5404e> | 3.078125 | 226 | Truncated | Science & Tech. | 40.364441 |
- Tokens that use double quoted strings or regexes do interpolation.
- Hence, they can be make context sensitive, by referring to other
items in the production rule. For instance, by interpolating
- The <matchrule:...> is another way of building dynamic
rules. The part after the colon is evaluated as a double quoted
st... | <urn:uuid:72d142cc-1dac-47bb-862e-0ccf751bebd3> | 2.84375 | 97 | Documentation | Software Dev. | 40.73 |
HP OpenVMS Systems Documentation
Guide to the POSIX Threads Library
2.5 Process-Shared Synchronization Objects
You can create synchronization objects (that is, mutexes, condition variables, and read-write locks) that protect data that is shared among threads running in different processes. These are called process-shar... | <urn:uuid:d3c356ae-7298-4851-9f07-8aa71d5643ff> | 3.578125 | 2,212 | Documentation | Software Dev. | 37.072103 |
University of Nottingham researcher Richard Hill and his colleagues used a powerful magnetic field to create a small, zero-gravity "arena" for fruit flies. Though magnetic fields attract magnetic substances such as iron, they also weakly repel certain other materials that are called "diamagnetic." These include water a... | <urn:uuid:b4b842bf-769b-435a-9d80-45e3ed9772a5> | 3.921875 | 695 | Knowledge Article | Science & Tech. | 60.391649 |
1. Nature: “Global warming blamed for 40% decline in the ocean’s phytoplankton”: “Microscopic life crucial to the marine food chain is dying out. The consequences could be catastrophic.”
If confirmed, it may represent the single most important finding of the year in climate science. Seth Borenstein of the AP explains, ... | <urn:uuid:327e1f67-0573-4cbf-a475-26b88212a670> | 3.28125 | 872 | Listicle | Science & Tech. | 37.239118 |
In honor of Darwin Day, I’d like to give a little shout out to some of Charles Darwin’s contributions to marine science.
Theory of Coral Reef Formation: Onboard the Beagle, Darwin composed the theory of coral reef formation. He described three types of reefs: fringe, barrier, and atoll. His illustrations of reef format... | <urn:uuid:e58985a6-1f00-4081-b5f6-e87f3165d730> | 3.46875 | 515 | Personal Blog | Science & Tech. | 38.972715 |
There are generally two types of variable stars:
- A star being eclipsed, where the changes in brightness are from perspective, are called extrinsic variables. For example, in a solar eclipse the moon gets between the sun and Earth. Binary star systems sometimes show eclipses, as do planetary systems with giant planets... | <urn:uuid:68d16d94-5c45-4bab-84a2-f743e69c4930> | 3.703125 | 1,049 | Knowledge Article | Science & Tech. | 48.471286 |
Sci. STKE, 31 July 2007
Plant Science Ethylene Controls Root Meristem Production
Katrina L. Kelner
Science, AAAS, Washington, DC 20005, USA
In plants, undifferentiated meristem tissue provides stem cells to produce roots and shoots. The root meristem contains a few of these stem cells in a region called the quiescent c... | <urn:uuid:f5e10190-464c-4d9a-b413-1845f58cabf1> | 2.6875 | 247 | Academic Writing | Science & Tech. | 58.310242 |
Abstract: Yichun Fu
Mentor: Dr. Burgmayer
Molybdenum is a 4d transition metal. It has crucial biological functions in many enzymes. Despite the differences among the Mo-containing enzymes, they all have a Molybdenum cofactor named as Moco, which promotes the catalytic activities of an enzyme. The Moco utilizes a dithio... | <urn:uuid:747cbb85-d017-4cf0-9a52-313c0e91de51> | 2.75 | 346 | Academic Writing | Science & Tech. | 28.05025 |
A massive protocluster of galaxies at a redshift of z ≈ 5.3
This is the pre-published version harvested from ArXiv. The published version is located at http://www.nature.com/nature/journal/v470/n7333/full/nature09681.html
Massive clusters of galaxies have been found that date from as early as 3.9 billion years1 (3.9 Gy... | <urn:uuid:4b0a582e-7e71-42a3-9506-4ba34ab1f09a> | 2.6875 | 457 | Academic Writing | Science & Tech. | 59.968081 |
Science Fair Project Encyclopedia
Topoisomerases (type I: EC 18.104.22.168, type II: EC 22.214.171.124) are enzymes that act on the topology of DNA. The double-helical configuration that DNA strands naturally reside in makes them difficult to separate, and yet they must be separated by helicase proteins if other enzyme... | <urn:uuid:6344fdec-5bcf-4c47-b8cb-92a55a7e1c79> | 4.09375 | 530 | Knowledge Article | Science & Tech. | 29.305366 |
Glenn Chaple's Observing Basics: The phases of Venus
January 2009: Begin IYA2009 by replicating Galileo's observations of our "sister planet."
November 24, 2008
|Happy International Year of Astronomy! Capitalizing on the fact that 2009 marks the 400th anniversary of Galileo's earliest telescopic forays into the night s... | <urn:uuid:e6d4677a-3bb8-411e-b46f-1c5efd3fb91e> | 2.78125 | 255 | Truncated | Science & Tech. | 34.861154 |
A closure is a programming technique that allows variables outside of the scope of a function to be accessed. In many cases, a closure is created when a function is defined within another function, allowing the inner function to access variables within the outer function.
- Closures, The Term
- Code Rant: What is a Clo... | <urn:uuid:933cf074-f728-4bff-93dd-38c32d887671> | 3.546875 | 75 | Knowledge Article | Software Dev. | 37.74791 |
Conservation of old-growth dependent mallee fauna
Prepared by David Baker-Gabb for the Black-eared Miner Recovery Team, February 2001
(Revised February 2003)
The Black-eared Miner Manorina melanotis (Wilson 1911) formerly occurred in the Murray Mallee region of South Australia, Victoria and New South Wales, but is no l... | <urn:uuid:f2e75346-5242-4f0a-a752-cf513a3fca00> | 2.84375 | 391 | Knowledge Article | Science & Tech. | 27.646604 |
There is an interesting letter in Nature Geoscience this month on what climate changes we have actually already committed ourselves to. The letter, by Mathews and Weaver (sub. reqd.), makes the valid point that there are both climatic and societal inertias to consider.
Their figure neatly demonstrates the different iss... | <urn:uuid:71b2283d-8116-4e7e-9519-ae8990efba01> | 3.015625 | 593 | Comment Section | Science & Tech. | 35.447447 |
Enumeration is mean of retaining all the series of element at a time. An object implement interface generates a series of all element at single time. This is read only. We cannot change the value of an object or value in the collection.
Understand with Example
Array List<String> list = new Array List<String>()
Create a... | <urn:uuid:b4167890-0ae0-4759-a5c1-ca0bb6048547> | 3.9375 | 226 | Tutorial | Software Dev. | 56.661765 |
Startling animation reveals New York City's carbon footprint
A eye-opening new animation of New York City visualizes the epic scale of climate pollution coming from our lives. I highly recommend watching to the end of this three minute video to see what a single year's worth looks like:
My only quibble with this excell... | <urn:uuid:6a1da6a1-710a-4dc3-9a62-e06ed8d26231> | 3.015625 | 869 | Personal Blog | Science & Tech. | 51.200375 |
The Microwave Limb Sounder (MLS) on NASA's Aura shows weaker than usual ozone transport and strong photochemical loss
The difference between the means inside and outside the lower stratospheric vortex is an estimate of chemical O3 loss. Vortex chemical loss is at most 75 DU.
Weaker than usual transport to high latitude... | <urn:uuid:1e950fe3-f098-4295-8e22-4d5599ecdd93> | 3.359375 | 524 | Knowledge Article | Science & Tech. | 53.683068 |
You might think seafaring Vikings–who traveled hundreds of miles on rough seas between 750 and 1050 AD–would be adrift on cloudy days: not only did they lack compasses, but they were often traveling so far north that the sun never set, and thus couldn’t use stars to navigate. But scientists are finding new evidence to ... | <urn:uuid:abd69169-0b5d-4b55-ad2e-6b581f8ec31d> | 3.875 | 641 | Nonfiction Writing | Science & Tech. | 39.199462 |
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle. A value of 0 is a circular orbit, values between 0 and 1 form an elliptical orbit, 1 is a parabolic escape orbit, and greater than 1 is a hyperbola. The ter... | <urn:uuid:4f6bbb8a-f456-41d6-baa8-963f56cfc529> | 3.984375 | 1,923 | Knowledge Article | Science & Tech. | 58.252091 |
The authors are apparently unaware that clouds act as the Earth's negative feedback cooling mechanism and have maintained relatively stable Earth temperatures for millions of years without any evidence of net positive feedback "tipping points." Not to mention, the scheme is irreversible if solar activity enters a lull ... | <urn:uuid:a8357ffe-c2a5-46c7-9eb3-43389ef8549f> | 3.703125 | 386 | Academic Writing | Science & Tech. | 25.93695 |
Chemical Reactions in the Atmosphere
Reading Assignment: Read the brief introduction to atmospheric chemistry by Sasha Madronich, Senior Scientist at the National Center for Atmospheric Research (linked below). Read chapter 9 in Manahan.
Homework: HW-10, due Friday, April 4.
We have seen, in earlier discussions, that s... | <urn:uuid:5a066273-47fc-4628-9963-425d142fae02> | 3.84375 | 1,950 | Academic Writing | Science & Tech. | 37.471295 |
A block B of mass 0.4 kg and a particle P of mass 0.3 kg are connected by a light inextensible string. The string passes over a smooth pulley at the edge of a rough horizontal table. B is in contact with the table and the part of the string between B and the pulley is horizontal. P hangs freely below the pulley (see di... | <urn:uuid:e92c5e01-2b83-4cdd-8ba3-8b034add72b2> | 3.4375 | 173 | Tutorial | Science & Tech. | 80.91539 |
Advantages and Capabilities of Infrasound monitoring for Bolide detection
Infrasonic waves have very low signal attenuation in the atmosphere. The diagram below (taken from Beer, 1974) shows the approximate attenutation as a function of frequency and height:
Figure 1. Attenuation of infrasound with frequency and propag... | <urn:uuid:97023721-8114-4b52-8223-5fcb1633e1eb> | 3.359375 | 367 | Knowledge Article | Science & Tech. | 27.105034 |
Life on Earth has been modifying the environment for billions of years. Green-plant photosynthesis was essential for the development of our current oxygen-rich atmosphere. The history of increasing oxygen in the atmosphere and ocean is complex, however, and significant free oxygen has been available in the atmosphere o... | <urn:uuid:d6318736-a5dd-4960-97e3-5bd1ef00c206> | 3.8125 | 1,771 | Knowledge Article | Science & Tech. | 32.314317 |
Two subspecies of swamp sparrow nest in the mid-Atlantic states: the southern swamp sparrow and the coastal plain swamp sparrow. Scientists compared the songs of southern swamp sparrows from the mountains of Maryland with the songs of coastal plain swamp sparrows from the tidal marshes of Delaware.
The songs differed b... | <urn:uuid:1125c178-2a70-4deb-becd-b16bea02a004> | 3.359375 | 507 | Academic Writing | Science & Tech. | 35.05292 |
What is the difference between the dot
(.) and the dollar sign
($)?. As I understand it, they are both syntactic sugar for not needing to use parentheses.
For example, let's say you've got a line that reads:
If you want to get rid of those parenthesis, any of the following lines would also do the same thing:
The primar... | <urn:uuid:2f693316-fcc3-4c81-a192-f208c5fabdb0> | 3.203125 | 423 | Q&A Forum | Software Dev. | 49.896562 |
ENABLING MANAGEMENT RESPONSE OF SOUTHEASTERN AGRICULTURAL CROP AND PASTURE SYSTEMS TO CLIMATE CHANGE
Location: National Soil Dynamics Laboratory
Title: Effects of elevated carbon dioxide and increased temperature on methane and nitrous oxide fluxes: evidence from field experiments
Submitted to: Frontiers in Ecology and... | <urn:uuid:1fdfcc8a-b4a7-49fc-9154-1f5484a88705> | 2.875 | 541 | Academic Writing | Science & Tech. | 23.062642 |
|Themes > Science > Astronomy > The Galaxies > Groups, Clusters, and Superclusters of Galaxies > Superclusters of Galaxies|
An Example: the Local SuperclusterOur own galaxy and its Local Group belong to a supercluster called the Local Supercluster. It similar in shape to a flattened ellipse (pancake), with the Virgo Cl... | <urn:uuid:087c37bb-4283-40d1-91ad-bed6c6339472> | 3.90625 | 486 | Knowledge Article | Science & Tech. | 26.646319 |
Planetary Protection: X-ray Super-Flares Aid Formation of "Solar Systems"
This Chandra image shows the Orion Nebula Cluster, a rich cluster of young stars observed almost continuously for 13 days. The long observation enabled scientists to study the X-ray behavior of young Sun-like stars with ages between 1 and 10 mill... | <urn:uuid:d9f45a97-cc41-4e05-a39e-d084a165d48d> | 4.15625 | 271 | Knowledge Article | Science & Tech. | 45.187391 |
In Bayesian statistics, a credible interval (or Bayesian confidence interval) is an interval in the domain of a posterior probability distribution used for interval estimation. The generalisation to multivariate problems is the credible region. Credible intervals are analogous to confidence intervals in frequentist sta... | <urn:uuid:802c1a17-d527-4c32-bbf4-abdd4a2873db> | 3.28125 | 1,709 | Knowledge Article | Science & Tech. | 49.890297 |
Science in the News, December 2004 -- On December 26, 2004, a tsunami in the Indian Ocean devastated coastal areas of Indonesia, Sri Lanka, Thailand, India, Somalia, Myanmar, and others, causing more than 225,000 fatalities and leaving more than five million people homeless. This tsunami was triggered by an intense und... | <urn:uuid:dd759b16-f508-4056-9ae8-6a6b2aeb8e9f> | 4.25 | 633 | Knowledge Article | Science & Tech. | 41.769526 |
The 24 facets are octahedral, and six meet at each vertex. The number of vertices is also 24, as the 24-cell is self-dual.
Vertices of a 24-cell centred at the origin of 4-space, with edges of length 1, can be given as follows: 16 vertices of the form (±½,±½,±½,±½), and 8 vertices obtained from (0,0,0,±1) by permuting ... | <urn:uuid:ffd94d78-d30c-4567-a171-6986a9e34b29> | 2.828125 | 202 | Knowledge Article | Science & Tech. | 63.806667 |
This section explains how to use the match data to find out what was matched by the last search or match operation, if it succeeded.
You can ask about the entire matching text, or about a particular parenthetical subexpression of a regular expression. The count argument in the functions below specifies which. If count ... | <urn:uuid:7a8e4ca5-070e-4639-9064-c6997863996d> | 2.875 | 1,035 | Documentation | Software Dev. | 62.897084 |
A storm over shifting sands
Desertification advances in China
The Boston Globe, May 5, 2002
LONGBAOSHAN, China - Whipped by the wind, sand from Sky Desert swept through this village last month like sheets of stinging rain, clattering against dried corn husks and piling up in low drifts against buildings.
Longbaoshan, a... | <urn:uuid:70ee8ba4-9ec2-4a67-a308-bf88001306db> | 3.09375 | 756 | Truncated | Science & Tech. | 51.925882 |
As concerns about global warming grow, scientists are turning to sophisticated computational models to better understand and ultimately predict the impact of climate change and human activity on biodiversity.
Putting computer science to work on biodiversity
Policy makers are asking tough questions about how climate cha... | <urn:uuid:a437c0b7-2cab-4ca2-96f0-bfb1fa462061> | 3.65625 | 1,679 | Knowledge Article | Science & Tech. | 32.472903 |
This image from the OMI instrument on NASA's Aura satellite shows nitrogen
dioxide levels from July 15, 2011 to July 18, 2011 of Ontario and the Great
Lakes. The highest levels of NO2 appear in red. The NO2 is measured by the
number of molecules in a cubic centimeter. Credit: NASA/James Acker
Aura Detects Pollution in ... | <urn:uuid:ba34e449-693e-447c-bcaf-1d1bc676dec7> | 3.65625 | 557 | Knowledge Article | Science & Tech. | 52.164439 |
Recall that anywhere there is an electric charge, there exists an electric field around it throughout space. If the charge moves, the electric field (or any field-line) around it moves as well. The motion of the charge causes change in the electric field intensity (E) at any point in space that varies with distance and... | <urn:uuid:c9461e33-1fb6-46bb-972a-66e1e52945c9> | 4.09375 | 3,841 | Tutorial | Science & Tech. | 84.617286 |
Low energy transfers to the Moon were first demonstrated in 1991 by the Japanese spacecraft Hiten. This was a result of a mission rescue by Edward Belbruno and James Miller. The transfer used by Hiten is a revolutionary new type of low energy transfer to the Moon derived from Weak Stability Boundary Theory. See Capture... | <urn:uuid:b48086ef-353b-4a29-bb39-db642d839a0d> | 3.640625 | 158 | Knowledge Article | Science & Tech. | 36.86 |
The Doppler Effect allows the distance between a satellite transmitting from space and a radio receiver on the ground to be measured by observing how the frequency received from the satellite transmitter changes as the satellite approaches, passes overhead, and moves away.
The frequency received can be displayed on a D... | <urn:uuid:9bb3629e-d6b3-4f2d-a922-45f4b5d3da20> | 4.21875 | 219 | Knowledge Article | Science & Tech. | 32.177385 |
The following table gives information about the ORBITS of the NINE planets of the SOLAR SYSTEM. The force of GRAVITY makes the planets move in orbits that are nearly circular around the SUN.
Planet Distance Mass Time for 1 from of Planet Orbit Sun (x10 ^22 kg) of Sun (million km) (days) Mercury 58 33.0 88.0 Venus 108 4... | <urn:uuid:2cbcd8e0-49a2-4157-9b75-9aa0bbb07d28> | 3.6875 | 1,340 | Tutorial | Science & Tech. | 92.2906 |
12/17/2005 9:08:16 PM
Gravatational Propulsion: Simple
I've read many of the messages posted and decided I would add some comments and more importantly action myself (and hopefully some of you ) to find the answer to some fairly simple questions that will put the problem to one of required energy, energy generation and... | <urn:uuid:326cfa66-ea0f-4eb1-99ae-134d01e997c3> | 2.96875 | 1,320 | Comment Section | Science & Tech. | 54.988806 |
Tuesday, March 16, 2010
Mad science: Can you hear me now?
The Guardian reports on an astronomer who claims that one of the unexpected consequences of switching to digital broadcast technology is that it makes the Earth harder to detect from space.
In the past, TV and radio programmes were broadcast from huge ground sta... | <urn:uuid:302a4c9b-cf8b-409c-aab7-e83edab0f827> | 2.90625 | 342 | Personal Blog | Science & Tech. | 51.794988 |
Scientific name: Cupido minimus
Our smallest butterfly. Upperwings brown with blue dusting. Undersides pales blue with row of black spots.
Our smallest resident butterfly is easily overlooked, partly because of its size and dusky colouring, but partly because it is often confined to small patches of sheltered grassland... | <urn:uuid:a8d86319-6e56-4940-86c1-c3bbb9c371c4> | 3.234375 | 414 | Knowledge Article | Science & Tech. | 37.146432 |
The Byte Code Engineering Library (Apache Commons BCEL™) is intended to give users a convenient way to analyze, create, and manipulate (binary) Java class files (those ending with .class). Classes are represented by objects which contain all the symbolic information of the given class: methods, fields and byte code ins... | <urn:uuid:6eb10ede-c9dc-4df9-a9ab-424090d0d27b> | 2.984375 | 257 | Knowledge Article | Software Dev. | 45.316927 |
The basic idea is quite simple: suppose that for a metric trait, two populations A and B have mean value a and b and that a third population C is formed by mixture between A and B. Unlike allele frequencies where the admixed population's frequency will be between a and b immediately post-admixture, anthropometric trait... | <urn:uuid:fab88e48-1bf5-4d63-99b2-3ab36dc8c90a> | 3 | 1,116 | Comment Section | Science & Tech. | 45.632101 |
Magnetospheric Multiscale Mission
||This article needs additional citations for verification. (July 2009)|
The Magnetospheric Multiscale Mission (MMS) is a planned NASA unmanned space mission, to study the Earth's magnetosphere using four identical spacecraft flying in a tetrahedral formation. It will be deployed in 20... | <urn:uuid:21a927ad-caba-480a-b5be-8b90db21a297> | 3.265625 | 1,062 | Knowledge Article | Science & Tech. | 49.262874 |
XIV. PROGRESS IN ELECTRICITY FROM GILBERT AND VON GUERICKE TO FRANKLIN
We have seen how Gilbert, by his experiments with magnets, gave an impetus to the study of magnetism and electricity. Gilbert himself demonstrated some facts and advanced some theories, but the system of general laws was to come later. To this end t... | <urn:uuid:4edb34b1-c9bb-4232-b08a-ef9a2cd2862b> | 3.390625 | 1,188 | Knowledge Article | Science & Tech. | 32.05179 |
The cold start to 2010 can be partially explained by the dramatic shift in the mid-latitude jet stream configuration associated with the Arctic Oscillation (AO) and the North Atlantic Oscillation (NAO). The switch began on New Year’s Day as an arctic air mass entered the region and started what would be the coldest 2 w... | <urn:uuid:9ddfc2b8-e151-4567-a3d0-cdd9067f9a15> | 3.28125 | 789 | Personal Blog | Science & Tech. | 57.093778 |
4.4. A Mid-Infrared Look Within Galaxies
ISO-CAM CVF studies between 5 and 17 µm are turning out to be powerful diagnostics of the radiation field within the disks of nearby galaxies, allowing us to disentangle the variations in heating intensity and hardness of interstellar radiation. The approach is to relate the int... | <urn:uuid:157eb025-b43c-4756-9fb3-6dba263dfa4c> | 2.953125 | 875 | Academic Writing | Science & Tech. | 50.694165 |
Brought to you by the Mars Global Surveyor Radio Science Team
Late Martian Weather!
Highlights of the Martian Atmosphere
Martian Temperature and Pressure Profiles
Public Access to Data Products
Daily Martian Weather Report Information
MGS Radio Science Team
Other Temperature and Pressure Profiles
Images of the Martian ... | <urn:uuid:6f7fa5cc-66d5-4b56-9d6f-737353b667e3> | 3.140625 | 628 | Knowledge Article | Science & Tech. | 37.444514 |
When I’m programming, I usually anthroporporphize the code and the actors involved, and that means when I’m thinking about program flow, I think of it as if they’re real actors doing the tasks needed, and then I convert that back into code. But, when reading other people’s code, I often times find it hard to convert ba... | <urn:uuid:5c6b77e7-529a-4f55-bbd2-6252bbf3ff39> | 2.828125 | 709 | Personal Blog | Software Dev. | 70.180678 |
Cosmic Collisions impact Jupiter
Posted on Sep 19, 2012 in News
Contrary to popular belief, the solar system isn’t a quiet and serene neighborhood in the suburbs of the Milky Way. At 11:35 UTC on Monday, September 10, a cosmic vagrant – be it a comet or asteroid – crashed into the atmosphere of Jupiter in a brilliant f... | <urn:uuid:dca8854f-b695-4d54-99fe-c9409b2efe33> | 3.359375 | 667 | Personal Blog | Science & Tech. | 45.610707 |
Okay, so let’s say we have a closed circuit composed of a simple loop of wire following a closed path . There’s no battery or anything that might normally induce an electromotive force around the circuit by chemical or other means. And, as we saw when discussing Gauss’ law, Coulomb’s law gives rise to an electric field... | <urn:uuid:e1d745d7-6886-4301-9688-b32ac87b666d> | 3.875 | 391 | Personal Blog | Science & Tech. | 44.969477 |
Ask a question about 'Natterer compressor'
Start a new discussion about 'Natterer compressor'
Answer questions from other users
A Natterer compressor
was a type of air compression
An air compressor is a device that converts power into kinetic energy by compressing and pressurizing air, which, on command, can be release... | <urn:uuid:002c8ee6-05bb-4039-ad24-4d6a45c9870e> | 3.25 | 270 | Q&A Forum | Science & Tech. | 45.244357 |
- Futurity.org - http://www.futurity.org -
Voyager 1 cruises ‘highway’ at solar system’s edge
Posted By Michael Buckley-Johns Hopkins On December 4, 2012 @ 3:56 pm In Science & Technology | 6 Comments
JOHNS HOPKINS / CALTECH (US) — NASA’s Voyager 1 spacecraft, soon to become the first human-built object in interstellar... | <urn:uuid:0ef44f8f-4f7e-49fe-98fc-4d4dbc7044a3> | 2.96875 | 1,289 | Truncated | Science & Tech. | 48.494662 |
Nitrogen oxides are emitted from high temperature combustion sources such as autos, trucks, aircraft and from boilers used to provide heat, steam or electricity.
Since air is made up of almost 80 percent nitrogen, when high temperature burning occurs, some of the nitrogen in the air is burned to release nitric oxide or... | <urn:uuid:6638907e-94ac-47db-906e-5c7e48480b1c> | 3.828125 | 229 | Knowledge Article | Science & Tech. | 26.174257 |
so how do i know if the ph is changing?
Indicate whether the pH increases, decreases, or remains the same when each of the following is added. (CH3NH3)Cl to a solution of CH3NH2 pyridinium nitrate, (C5H5NH)(NO3) to a solution of pyridine, C5H5N sodium formate to a solution of formic acid how do you know these?
use a ca... | <urn:uuid:0d925678-9af9-47ed-9a0e-36a4e346962d> | 2.890625 | 403 | Q&A Forum | Science & Tech. | 85.184848 |
Mon Nov 09 09:48:52 GMT 2009 by Forlornehope
Whenever this idea is suggested, no one ever mentions the Coriolis acceleration. A good example of this is the way in which air flows round atmospheric areas of low pressure, rather than going straight from high to low. Some of the comments here have the idea, the tangential... | <urn:uuid:d5b92634-92a9-4833-b7a8-7d5c9bce3dc4> | 2.984375 | 1,103 | Comment Section | Science & Tech. | 69.696421 |
Or. . .
Thu May 27 12:09:28 BST 2010 by Jeff Green
Is it naive to suggest that giving the plane a nice big positive charge would stop the ash getting into the engines in the first place?
Or. . .
Thu May 27 19:26:05 BST 2010 by Allan Brewer
Its a beautifully creative idea. Without knowing the weight of an ash particle a... | <urn:uuid:035abcd6-ab51-4b21-b3c8-8809d5fd7ed2> | 2.796875 | 212 | Comment Section | Science & Tech. | 64.290909 |
Cumulus Clouds (Low Cloud)
If you look in the photo above you can see the line of Cumulus clouds that appear in the background. These clouds were created by daytime heating and also an unstable atmosphere. The moisture for these clouds was rising from the Pacific Ocean. The darker cloud is the stronger of the cumulus c... | <urn:uuid:6885f590-0ee4-430a-bb4c-608a59a088d6> | 3.3125 | 203 | Knowledge Article | Science & Tech. | 51.949454 |
Nov. 26, 2004 Dutch researcher Lourens Rijniers has discovered why William of Orange's grave, the monument on the Dam in Amsterdam and the Alhambra in Granada are all badly affected by salt damage. Salt can cause a lot of damage in materials with small pores, such as concrete and mortar. This is because the pressure wh... | <urn:uuid:9fe684ca-2d13-47ea-912c-08cb0444e9de> | 3.625 | 485 | Academic Writing | Science & Tech. | 42.613525 |
astronomer argues for a changing cosmos
By R. Cowen
HVEN, Denmark, January 1578—Heavens! Could the teachings of Aristotle and other scholars all be wrong?
This placid island seems an unlikely place from which to challenge the prevailing view of the universe. But that's just what Danish astronomer Tycho Brahe has done. ... | <urn:uuid:53cbcbee-97b2-4209-8f6e-de2ad1977ae2> | 3.640625 | 864 | Truncated | Science & Tech. | 56.537092 |
Imagine that you're in a car traveling at a high speed and accelerating quickly. You're heading directly toward a brick wall, and you continue to accelerate until you reach that wall. Sounds like you're in a heap of trouble, doesn't it? Not necessarily. When we hear the word acceleration, we usually assume it means "in... | <urn:uuid:03625274-0919-46e4-b3c1-0a3934b42801> | 4.90625 | 767 | Knowledge Article | Science & Tech. | 50.696262 |
Unlike today's Web, web services can be viewed as a set of programs interacting cross a network with no explicit human interaction involved during the transaction. In order for programs to exchange data, it's necessary to define strictly the communications protocol, the data transfer syntax, and the location of the end... | <urn:uuid:0d6d1549-1e3f-4d76-b9d6-cb68d3928a0f> | 2.734375 | 2,912 | Comment Section | Software Dev. | 41.367849 |
After the decimation suffered during World War II, mankind took a look at all the new technologies he had created to fight the war and turned his gaze towards the stars. From the late 1940’s this onward and upward reach has helped to fuel the engines of our ingenuity, but what has fueled those stellar ambassadors that ... | <urn:uuid:edf65a9f-2c35-4140-991a-5c0740e49a34> | 3.859375 | 1,014 | Personal Blog | Science & Tech. | 51.321042 |
Ocean warming may increase the abundance of marine consumers
Warmer ocean temperatures could mean dramatic shifts in the structure of underwater food webs and the abundance of marine life, according to a new study by researchers at the University of North Carolina at Chapel Hill, UNC Coastal Studies Institute and DePau... | <urn:uuid:10993d20-0091-47f8-b031-2ff975f77c02> | 3.09375 | 670 | Academic Writing | Science & Tech. | 32.042023 |
You never create an actual streambuf object, but only objects of classes derived from class streambuf. Examples are filebuf and strstreambuf, which are described in man pages filebuf(3CC4) and ssbuf(3), respectively. Advanced users may want to derive their own classes from streambuf to provide an interface to a special... | <urn:uuid:2e8537f0-2c65-4f68-8d2c-94d550c46367> | 3.0625 | 322 | Documentation | Software Dev. | 42.65206 |
You can configure the Network Server to use a specific number of threads to handle connections. You can change the configuration on the command line or by using the servlet interface.
The minimum number of threads is the number of threads that are started when the Network Server is booted. This value is specified as a ... | <urn:uuid:e60fd46a-7c16-4c1a-bc25-34ee4605deba> | 2.96875 | 394 | Documentation | Software Dev. | 50.751925 |
London Zoological Society reports on health of planet Earth
Tuesday, October 24, 2006
The annual Living Planet Report compiled by the Zoological Society of London and the Global Footprint Network, published this week by WWF International, assessed "the health of the planet's ecosystems" and measured the demands people ... | <urn:uuid:885d738e-9b75-46e0-a264-9d859197287d> | 3.34375 | 453 | Knowledge Article | Science & Tech. | 43.216489 |
Sivapullaiah, Puvvadi Venkata and Manju, * (2005) Kaolinite - alkali interaction and effects on basic properties. In: Geotechnical and Geological Engineering, 23 (5). pp. 601-614.
Restricted to Registered users only
Download (258Kb) | Request a copy
The influence of type and amount of clays present in soils on their pr... | <urn:uuid:03fd4449-198e-4539-bf9b-e8184f17ab25> | 2.875 | 504 | Academic Writing | Science & Tech. | 28.511873 |
Besides working with individual objects, applications often need to deal with
collections of objects. Figure 8 gives a simple example
of using collections with JiBX. Here the classes represent the basics of an
airline flight timetable, which I'll expand on for the next examples. In this
example I'm using three collecti... | <urn:uuid:f609fc38-e426-4d6d-90a0-1e653a046650> | 2.734375 | 1,227 | Documentation | Software Dev. | 37.389042 |
See also the
Dr. Math FAQ:
Browse High School Euclidean/Plane Geometry
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Pythagorean theorem proofs.
- Non-Euclidean Geometry for 9th Graders [12/23/1994]
I would to know if there is non-euclidean geome... | <urn:uuid:7f498345-aeeb-4138-9c91-41b61e37ff27> | 3.46875 | 1,665 | Q&A Forum | Science & Tech. | 65.660111 |
2.2. The effect on the acoustic peaks
We will now focus our attention on possible effects of primordial magnetic fields on small angular scales. That is, temperature, as well polarization, anisotropies of the CMBR. By small angular scale (< 1°) we mean angles which correspond to a distance smaller than the Hubble horiz... | <urn:uuid:f6db00bc-be60-40e0-8737-0872b0e7bbb2> | 2.828125 | 2,631 | Academic Writing | Science & Tech. | 43.396395 |
Prove that you can make any type of logic gate using just NAND
Can you set the logic gates so that this machine can decide how many bulbs have been switched on?
What will happen when you switch on these circular circuits?
Can you think like a computer and work out what this flow diagram
Can you invert this confusing se... | <urn:uuid:ab7f5dc2-ca73-48bd-9dc4-dbc93cf860d4> | 3.828125 | 261 | Content Listing | Science & Tech. | 42.856753 |
When winds blow across the ocean surface, kinetic energy is transferred from the wind to surface water as a result of the friction between the wind and the ocean surface. The kinetic energy transferred to the ocean surface sets the surface layer of water in motion and generates both waves and currents.
Sunlight shining... | <urn:uuid:2acf6d4f-52bf-4681-a585-b0cdb5a1aa38> | 4.125 | 396 | Knowledge Article | Science & Tech. | 37.374563 |
Jan 4, 2011, 1:42 AM
Post #5 of 5
What the code does is this. Imagine you call the script like so:
|The program now shifts the first argument (-n) into $input. It then goes on to check if $input is defined and is "-n". If that is the case it sets $numeric to 1, and shifts the second argument (file.txt) into $input, whi... | <urn:uuid:e5aad3ee-fcb8-40c7-a168-6869de554847> | 2.703125 | 154 | Comment Section | Software Dev. | 89.802668 |
Jan 19, 2001, 11:30 AM
Post #1 of 1
(From the Perl FAQ)
Is it a Perl program or a Perl script?
It doesn't matter.
In ``standard terminology'' a program has been compiled to physical machine code once, and can then be be run multiple times, whereas a script must be translated by a program each time it's used. Perl progr... | <urn:uuid:fb005ad4-a9d7-4414-8944-f3594691f0d0> | 2.96875 | 169 | Comment Section | Software Dev. | 50.275225 |
“The familiar three dimensions of space—height, width and
length—may have been just one or two when the universe was formed, some physicists say.
to the report, their proposal holds that the familiar three
dimensions of space could have been folded into two or just one at
extremely high energies and temperatures.
Such ... | <urn:uuid:9c35267d-8158-4b44-a4ac-c2beac0e5ebb> | 3.171875 | 110 | Truncated | Science & Tech. | 41.036401 |
What are Black Holes Anyway?
Black holes are not really holes at all. They are the opposite of empty! Black holes have the most matter stuffed into the least space of any objects in the universe. Because they are so compact, they have very strong gravity.
Here on Earth, gravity is what makes things fall down, rather th... | <urn:uuid:bb511965-cc23-4d45-a9fe-265d7ac8d6d6> | 4.15625 | 640 | Knowledge Article | Science & Tech. | 66.377238 |
A vector is a mathematical object that has both magnitude (a numeric value) and direction. Velocity is a vector because it has both magnitude and direction. For example, a velocity of 33 kilometers per hour (kph) southeast has a magnitude of 33 and a direction of southeast. Speed is not a vector, and direction is not a... | <urn:uuid:9dea656a-cc39-4d66-aaef-15ff3f34296d> | 4.40625 | 1,360 | Tutorial | Science & Tech. | 61.172449 |
Galaxy clusters are the largest gravitationally bound objects in the universe. They have three major components:
- Hundreds of galaxies containing stars, gas and dust;
- Vast clouds of hot (30 - 100 million degrees Celsius) gas that is invisible to optical telescopes;
- Dark matter, a mysterious form of matter that has... | <urn:uuid:d7b074fd-91eb-4fa1-967b-993d8003a1c6> | 4.5 | 767 | Knowledge Article | Science & Tech. | 42.042156 |
It is well known that the past decade or so has seen less global warming than might have been expected – but what is the cause? This is more of a discussion post, rather than any new analysis.
The most recent decade has seen observed global temperatures at the lower limit of the model projections. There seem to be 3 po... | <urn:uuid:054d0e44-0480-4370-8fc5-1078c6bd575b> | 3.3125 | 509 | Personal Blog | Science & Tech. | 30.182384 |
Super Efficient Feeding Habits of Blue Whales
As most people will know, the blue whale is the largest animal alive and probably the largest animal that has ever lived. When a blue whale calf is born it is as big as a fully-grown hippopotamus and during its first seven months it will drink about 400 litres of its mother... | <urn:uuid:23abbf2e-4fcc-432c-9bb4-d0439c5b010d> | 3.953125 | 627 | Truncated | Science & Tech. | 43.864393 |
#include <string.h> int strncmp( const char *str1, const char *str2, size_t count );
The strncmp() function compares at most count characters of str1 and str2. The return value is as follows:
Return value Explanation
less than 0 str1 is less than str2
equal to 0 str1 is equal to str2
greater than 0 str1 is greater than... | <urn:uuid:f904eb95-fb24-46bd-8ddc-4050b4931541> | 3.109375 | 132 | Documentation | Software Dev. | 76.825622 |
Earthquakes Recorded in Virginia: A Primer
In the theory of plate tectonics, the earth's outermost layer is
composed of plates that move relative to each other. Most of the
world's earthquakes occur at the plate boundaries. Since places like
the California coast are on a boundary between two plates, they have
many more... | <urn:uuid:e5368898-9615-4a6c-b40d-787f0da0a85d> | 3.8125 | 364 | Knowledge Article | Science & Tech. | 53.855346 |
What happens if we get too close to a Black Hole?
The answer to this question might involve becoming a space traveler. Scientists have developed the theory that objects that are pulled into a black hole might move through a tunnel (sometimes called a worm hole) and end their journey in another spot in the universe. The... | <urn:uuid:2b795922-7d0a-4cb8-b279-b42b25e7588a> | 4.125 | 596 | Knowledge Article | Science & Tech. | 53.783957 |
Online Geometry Problem 697: Square, Circle, Sector, Segment, Tangent, Inscribed, Congruence.
Level: High School, Honors Geometry, College,
The figure shows a square ABCD of area S and the inscribed circle of center O. Circles E and G are tangent to circle O and tangent each other at the center O. Prove that the area o... | <urn:uuid:54106677-a25c-480a-ab81-80a8eb471e75> | 3.40625 | 98 | Tutorial | Science & Tech. | 56.778409 |
Continued from previous page
The interpretation of the comparison of observed and model-predicted concentrations for both organic carbon and black carbon is more difficult because of both inaccuracies in the observations (Section 5.1.2) and the fact that most measured concentrations are only available on a campaign bas... | <urn:uuid:bde4f10d-7df8-450f-a7b9-3a270d7bb6d4> | 3.203125 | 479 | Academic Writing | Science & Tech. | 33.524106 |
WHETHER we are searching the cosmos or probing the subatomic realm, our most successful theories lead to the inescapable conclusion that our universe is just a speck in a vast sea of universes.
Until recently many physicists were reluctant to accept the idea of this so-called multiverse. Recent progress in cosmology, s... | <urn:uuid:ec8164d6-1021-47e3-991c-62eacf336d6b> | 2.71875 | 219 | Truncated | Science & Tech. | 42.849813 |
Image #3 of sequence. In sharp contrast, by July 1998, a dramatic recovery had
taken place. There is a well-developed cold tongue and a dramatic bloom of
phytoplankton along the equator. High chlorophyll concentrations had not
previously been observed over such a large area.
Image ID: fish2198, NOAA's Fisheries Collect... | <urn:uuid:7b339379-d5c1-46c1-9b5f-590bc639ffc6> | 2.828125 | 108 | Truncated | Science & Tech. | 48.345 |
Search our database of handpicked sites
Looking for a great physics site? We've tracked down the very best and checked them for accuracy. Just fill out the fields below and we'll do the rest.
You searched for
We found 5 results on physics.org and 13 results in our database of sites
12 are Websites,
0 are Videos,
and 1 ... | <urn:uuid:a62de6e8-55c4-444a-9f53-6732bfce0078> | 3.21875 | 349 | Content Listing | Science & Tech. | 58.122619 |
Nucleic acids are long chains of monomers (nucleotides) that function as storage molecules in a cell. Nucleotides are composed of sugar, a phosphate group, and a nitrogenous base. ATP, DNA and RNA are all examples of nucleic acids.
Nucleic acids are one of the four basic kinds of organic molecules. Now they're used as ... | <urn:uuid:d445b71e-8984-45c6-963e-653a522e18f6> | 4.28125 | 782 | Knowledge Article | Science & Tech. | 47.831978 |
Compounds, and Mixtures
Any substance that contains only one kind of an atom is
known as an element. Because atoms cannot be created
or destroyed in a chemical reaction, elements such as
phosphorus (P4) or sulfur (S8) cannot
be broken down into simpler substances by these reactions.
Example: Water decomposes into a mix... | <urn:uuid:aebc9ee5-c805-4d7e-9918-b1d704d69b94> | 3.75 | 1,392 | Tutorial | Science & Tech. | 39.471739 |
Date: September 17, 2010
Creator: Behrens, Carl E.
Description: This report discusses the U.S. Landsat Mission, which has collected remotely sensed imagery of the Earth's surface for more than 35 years. The two satellites currently in orbit are operating beyond their designed life and may fail at any time. Most Landsat... | <urn:uuid:05ca6f23-89da-4e4c-a9cc-c380c9647284> | 3.296875 | 116 | Structured Data | Science & Tech. | 35.348599 |
As can be observed above, the effects of alcohol as shown in the blood alcohol concentration indicates that the higher the concentration the greater the risk of discomfort, unconsciousness and possibly death at the worst.
Living with the Monster Near the end of a half-mile-long hallway connecting the four reactors of t... | <urn:uuid:65799970-915e-4b0c-b13d-7c671c65b500> | 3.09375 | 1,575 | Nonfiction Writing | Science & Tech. | 42.486964 |
In mathematics, a plane is a flat, two-dimensional surface. A plane is the two dimensional analogue of a point (zero-dimensions), a line (one-dimension) and a solid (three-dimensions). Planes can arise as subspaces of some higher dimensional space, as with the walls of a room, or they may enjoy an independent existence... | <urn:uuid:85f3f18e-cf67-4dfa-a36a-4c8f1c969e72> | 3.9375 | 2,234 | Knowledge Article | Science & Tech. | 39.360176 |
What do refrigerator magnets, ear buds and counterfeit currency have in common? This week's element is neodymium, the "twin" of praseodymium, which we first learned about last week. Neodymium has the symbol Nd and the atomic number 60. Like most metals, neodymium is a lustrous silvery white colour, and like its twin, i... | <urn:uuid:a1ab3ac2-1f97-4217-b207-e7eea74487b6> | 2.921875 | 326 | Content Listing | Science & Tech. | 59.045351 |