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
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FINAL LANDING: Space shuttle Atlantis is seen in this still from a video camera on the exterior of the International Space Station after the two spacecraft undocked on July 19, 2011, during the final shuttle mission STS-135. It was the last time a NASA shuttle cast off from the orbiting lab. Image: NASA TV
NASA's space... | <urn:uuid:6b4452be-b2b9-4703-af8f-07fb2d681cc2> | 3.203125 | 750 | Structured Data | Science & Tech. | 57.668217 |
A Quick Introduction to UML Sequence Diagrams
This UML sequence diagram tutorial introduces the commonly used elements of UML sequence diagrams and explains how to use them.
All diagrams in this guide were created with Trace Modeler, an easy-to-use and smart editor for UML sequence diagrams developed by the author. Che... | <urn:uuid:32cc13fb-d2a5-42f7-b3d7-99a7a6da17e6> | 3.65625 | 2,915 | Tutorial | Software Dev. | 48.348869 |
Brief blurbs about recent arthropod news and research:
- The blue crab, Callinectes sapidus, has been found in England for the second time ever. These ill-tempered, but delicious, swimming crabs are native to North America; where they represent a major marine fishery despite serious conservation concerns. Previously, b... | <urn:uuid:98b9e6ea-c590-4dad-90c3-7aa55b12819b> | 3.28125 | 502 | Personal Blog | Science & Tech. | 27.589354 |
A process for proving mathematical statements involving members of an ordered
set (possibly infinite). There are various formulations of the principle of
induction. For example, by the principle of finite induction, to prove a
statement p(i) is true for all integers i ≥ i0 , it suffices to prove that
(a) P(i0) is true;... | <urn:uuid:994b0637-9fcc-4a51-8439-08a06484ce3c> | 4 | 196 | Knowledge Article | Science & Tech. | 68.170173 |
How do fish separate oxygen from H20 & consume it? Do they break the water molecule and absorb the oxygen only?
The answer to this, I recon, is that they don't.
They use molecular oxygen (O2) dissolved in the water for respiration, where is acts as a terminal electron acceptor, just as we use molecular oxygen in the ai... | <urn:uuid:118dffc4-0bf0-427d-a67c-016a5c6fa046> | 3.078125 | 752 | Q&A Forum | Science & Tech. | 51.110011 |
we cannot See the whole universe.
light unable to cross in age of universe
there are multiple reasons for this (maybe i’m missing some):
1. given the speed of light, in all likelihood (we can’t tell) the diameter of the universe is larger than the distance light can travel in the age of the universe; so that light has ... | <urn:uuid:008457e9-2a60-4b63-b6ee-7c9e80cac9c5> | 2.921875 | 631 | Personal Blog | Science & Tech. | 42.333752 |
blue shift or blueshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the blue, or shorter wavelength, end of the visible spectrum. The amount of displacement is a function of the object's relative velocity toward the observer. Most observed blue shifts are ... | <urn:uuid:6fdfcdce-69cd-43f9-bbd0-c11f5592a314> | 4.09375 | 148 | Knowledge Article | Science & Tech. | 37.949256 |
The big chill of ocean warming
“I have very bad news for you. Are you man enough to take it?”
“God, no!” screamed Yossarian. “I’ll go right to pieces.”
—Joseph Heller, Catch-22
In 2001, Ian Walker, a 40-year-old associate professor of geography at the University of Victoria, began walking the desolate, kelp-strewn beac... | <urn:uuid:944b0da0-fb18-4e29-b172-ea3b1ac57f77> | 2.984375 | 1,538 | Nonfiction Writing | Science & Tech. | 58.372475 |
Tritum has a half-life of 12.3 years. Pretend you started with 100 kilograms of tritium. After 12.3 years (one half-life), only half (50 kg) of the tritium would be left (yellow lines). After 24.6 years (two half-lives), only one-quarter (25 kg) of the original 100 kg of tritium would be left (blue lines).
Click on ima... | <urn:uuid:74f401af-04bb-4c04-8412-fc9fc1528af4> | 3.859375 | 881 | Knowledge Article | Science & Tech. | 63.271461 |
Winds blowing along the South American coast bring cold, deep ocean water to the surface. This is one of several ways that the ocean and atmosphere in the Southeast Pacific are connected.
Courtesy of NOAA
Ocean-Atmosphere Coupling in the Southeast Pacific
There are many connections between the ocean and the atmosphere ... | <urn:uuid:ef528a2f-ef8a-4edf-a474-763e4d9b899c> | 3.671875 | 703 | Content Listing | Science & Tech. | 62.244071 |
White Dwarfs Eat Earth-Like Planets For Breakfast
A new discovery by the Hubble Space Telescope has allowed astronomers to find four white dwarf stars with stellar atmospheres consisting of oxygen, magnesium, iron, and silicon. Through this we are able to deduct that planets used to be found orbiting around the star be... | <urn:uuid:1b930309-2257-42dc-97df-6844b5887e10> | 3.125 | 172 | Personal Blog | Science & Tech. | 42.49 |
Boris Horvat / AFP - Getty Images
A hardhat worker walks around the construction site for the ITER fusion experiment in Saint-Paul-les-Durance, France.
The standard joke about nuclear fusion is that it's the energy technology of the future, and always will be. Well, fusion is still an energy option for the future rathe... | <urn:uuid:141ea205-c375-438d-916d-8c96ea4e4497> | 2.75 | 1,713 | Nonfiction Writing | Science & Tech. | 44.925091 |
2. Omitting parentheses around method arguments when not appropriate
Better use paranetheses parentheses for argument lists unless you are sure.
For instance, a left paranthesis parenthesis after a method name must always enclose the parameter list.
This may cause the compiler to to assume a complete statement although... | <urn:uuid:7600719a-7dc6-42de-b8eb-0fa5d4aecfd5> | 2.90625 | 143 | Documentation | Software Dev. | 37.522386 |
Gryllotalpa cultriger Uhler
Distribution and Damage
The main distribution is probably in Mexico, as it is uncommon along the US border. It is not considered a pest.
As with other mole crickets in the genus Gryllotalpa , the tibia of the western mole cricket has four dactyls. There is a row of five spines on the upper m... | <urn:uuid:6931dad7-6eb9-4088-9036-918310e967b4> | 3.046875 | 223 | Knowledge Article | Science & Tech. | 39.276969 |
Purple Sea Urchin
|More Ocean Resources
On a clear, sunny coastal day, the purple spines of the Purple Sea Urchin (Strongylocentrotus purpuratus) can be easy to spot in the inter-tidal zone.
Most of the time, sea urchins are stationary animals that attach themselves to a rock or other hard substrate in order to scrape ... | <urn:uuid:6e5cc891-5628-4d8a-9951-c14f2b24c35b> | 3.46875 | 213 | Knowledge Article | Science & Tech. | 47.352568 |
About this image
Impact craters can have a variety of floor features. Depending on the size of the meteorite and the material it is hitting the resultant crater can have a flat floor, a central peak or a central peak with a pit in it. The peak and peak/pit combination are formed by rebound of the surface material that ... | <urn:uuid:b01026b0-b510-427b-9ffe-ee427088dca4> | 3.359375 | 111 | Knowledge Article | Science & Tech. | 47.05211 |
|Analysis index||History Topics Index|
The terminology for elliptic integrals and functions has changed during their investigation. What were originally called elliptic functions are now called elliptic integrals and the term elliptic functions reserved for a different idea. We will therefore use modern terminology thr... | <urn:uuid:1c9c2909-bda5-48fc-b51f-26f370aa7815> | 3.96875 | 729 | Knowledge Article | Science & Tech. | 43.737576 |
Inventor of the Week Archive
for a different Invention or Inventor
One of the most popular labs at MIT is the one directed by
Toyoichi Tanaka, whose polymer gels have shown their potential
to transform the technology of medicine, energy, food production
Born and raised in Japan, Tanaka received his higher education
at ... | <urn:uuid:0fa7d5a8-9575-4118-bcce-1f7450021356> | 2.96875 | 719 | Knowledge Article | Science & Tech. | 41.026558 |
Do ghostly, imperceptible particles called "sterile neutrinos" wander the universe? The question has given physicists sleepless nights since evidence for the particles emerged a decade ago.
But now a new experiment has poured cold water on the idea, reassuring many scientists that their ideas are on the right track.
"O... | <urn:uuid:c6696216-77f6-4350-9f6e-5f994b2e4202> | 3.25 | 744 | Truncated | Science & Tech. | 32.097445 |
Video: An experiment on Earth simulates the sudden release of water into a crater on Mars, reproducing the pattern of sediment deposit seen in a real crater on the Red Planet (Video courtesy of Erin Kraal et al/Nature)
Billions of yeas ago on Mars, a river suddenly burst to the surface from underground and flooded a la... | <urn:uuid:b99cf6c1-3c72-4277-9b95-1c6db40d9968> | 4.09375 | 1,147 | Comment Section | Science & Tech. | 51.110048 |
Number Of Planets
Date: Prior to 1993
How many known planets are there, inside and outside the solar
system? I have read in Astronomy magazine that at least 2 planets were
discovered around a pulsar (I do not know where) and that perhaps a 10th
planet lies past Pluto. Any more I do not know about?
I have not heard of a... | <urn:uuid:2a7f4640-d224-408a-a0b8-149b26c2d458> | 2.84375 | 199 | Knowledge Article | Science & Tech. | 50.411974 |
Climate Change and Weather
Does climate change affect day-to-day weather?
Yes, it appears that rising global temperatures are already affecting weather by intensifying the extremes. Hot days are hotter, rainfall and snowfall are heavier, and dry spells are longer.
Is there a connection between global warming and extrem... | <urn:uuid:e8812296-8a23-486a-bdbf-27ed5a859d44> | 3.9375 | 520 | Knowledge Article | Science & Tech. | 25.913558 |
Really .= isn't an "append operator" it's just syntactic sugar for an assignment back to the same lvalue after using the concatenation operator, just like += is syntactic sugar for adding and assigning in one step. It's just that, unlike addition (or the other mathematical operators), concatenation isn't commutative.</... | <urn:uuid:7170f2fb-45aa-4064-a1d0-fac1f4f17f13> | 2.6875 | 367 | Comment Section | Software Dev. | 71.662045 |
Definition: A conceptual method of open addressing for a hash table. A collision is resolved by putting the item in the next empty place given by a probe sequence which is independent of sequences for all other key.
See also collision resolution scheme, clustering free, double hashing, quadratic probing, linear probing... | <urn:uuid:862ad2ff-5960-4b87-9608-bfae13d50175> | 3.03125 | 223 | Knowledge Article | Software Dev. | 52.480885 |
Some animals are poorly named. The flying lemur doesn’t fly and isn’t a lemur. The mantis shrimp isn’t a mantis or a shrimp. The killdeer couldn’t. But the giant bumphead parrotfish… it’s a giant fish with a beak like a parrot and a bump on its head. Nice one, biologists. You can have a point for that.
The giant bumphe... | <urn:uuid:c4e358f5-5236-487c-a93a-32f23a314bbe> | 2.90625 | 618 | Personal Blog | Science & Tech. | 63.477129 |
Turtle embryos find the sunny spot
Wei-Guo Du from the Chinese Academy of Sciences has found that the embryos of soft-shelled turtles “bask” inside their eggs. “People usually think reptilian embryos are immobile,” says Du. After all, their limbs are tiny stumps and they have few places to move to. But that doesn’t sto... | <urn:uuid:756c8368-c34a-4a05-af5a-5f9b21e4cc89> | 2.875 | 247 | Personal Blog | Science & Tech. | 61.922788 |
Permutation recursive help
Producing consecutive permutations.Need to develop a method that lists one by one all permutations of the numbers 1, 2, …, n (n is a positive integer).
(a) Recursive method . Given a verbal description of the algorithm listing all permutations one by one, you are supposed to develop a recursi... | <urn:uuid:ead92ff8-eeb1-4733-ba41-1b98d876da7a> | 3.578125 | 862 | Comment Section | Software Dev. | 72.764511 |
Typically when you spawn a new thread, you want to give it a name to facilitate debugging. For example:
//.. other stuff....
Thread thread = new Thread(new ThreadStart(DoSomething);
thread.Name = "DoingSomething";
The code in the method DoSomething (not shown) will run on a thread named "DoingSomething."
Now suppose yo... | <urn:uuid:d046ffb1-f421-4b1f-b596-25c3f76d51bd> | 3.109375 | 192 | Tutorial | Software Dev. | 38.205227 |
This just goes to show that the ancient Chinese saying, "If you paddle down the river long enough, you'll find the remains of a 1,200 pound, 40,000 year old bison," is true.
University of Alaska biologists Dan Mann and Pam Groves did just that. Because the skeleton was in permafrost, hair and gristle were still attache... | <urn:uuid:26eddc26-e6e4-4b81-a011-41fbd43dc672> | 2.734375 | 96 | Truncated | Science & Tech. | 63.8 |
Learn how scientists are using bacteria to create different types of fuels.
How does fire pass from one burning stick to another unlit stick?
If you own a cat you know that they have a very distinctive blink. Learn the purpose behind this symbol.
Astronomers have found a planet with water known as HD 189733b.
We often ... | <urn:uuid:873efc16-3795-48fa-8f80-7eb631331150> | 2.78125 | 917 | Content Listing | Science & Tech. | 57.662539 |
Spent nuclear fuel pools
Spent nuclear fuel (SNF) refers to fuel after it has fueled a reactor. This fuel looks like new fuel in the sense that it is made of solid pellets contained in fuel rods. The only difference is that SNF contains fission products and actinides, such as plutonium, which are radioactive, meaning i... | <urn:uuid:9fc4b192-21c7-47d9-9bce-cb9819e11bed> | 4 | 1,011 | Knowledge Article | Science & Tech. | 48.245209 |
The most common basic syntax are:
For generating a PHP file, the developer has to create a file name using .php extension. This file seems like HTML file and saves as a plain text.
Writing comments is a good habit because it directs about what you have done. You will feel no difficulty while making any change or modifi... | <urn:uuid:99728b06-f3d2-41c8-b27f-12624551c176> | 3.703125 | 509 | Tutorial | Software Dev. | 60.485854 |
Learn more physics!
I have been reading about gravitational lensing. All the models I have seen discuss light going around the outside of some gravitational source, like a black hole or something. Would it act more like a traditional lens if passing through the middle a source that was more donut shaped, instead of aro... | <urn:uuid:dc02a44d-3db8-491f-b1e8-5e9f1b352073> | 3.21875 | 249 | Q&A Forum | Science & Tech. | 50.701925 |
We’ve been to the moon. Mars is easy. But landing on Venus? That’s tough.
- By Sam Kean
- Air & Space magazine, September 2010
(Page 3 of 4)
Answering the question requires lots of data, and the lander will have to gather its information without human supervision. The pictures and other data will arrive at Earth only a... | <urn:uuid:be79b99a-e351-406d-8c58-21b709f11cc7> | 3.703125 | 1,023 | Truncated | Science & Tech. | 46.828165 |
Pisces and Cetus - Downloadable article
A shipload of galaxies rides high above the watery constellations Pisces the Fish and Cetus the Whale.
March 3, 2009
|This downloadable article is from an Astronomy magazine 45-article series called "Celestial Portraits." The collection highlights all 88 constellations in the sky... | <urn:uuid:6b802224-48f2-4f7b-98a3-1f0f058ee90d> | 2.96875 | 562 | Truncated | Science & Tech. | 61.32825 |
Coral Responses to Recurring Disturbances on Saint-Leu Reef
Scopelitis, J., Andrefouet, S., Phinn, S., Chabanet, P., Naim, O., Tourrand, C. and Done, T. 2009. Changes of coral communities over 35 years: Integrating in situ and remote-sensing data on Saint-Leu Reef (la Reunion, Indian Ocean). Estuarine, Coastal and Shel... | <urn:uuid:7f7c947c-fdcc-42ce-bf67-2b83e798062b> | 3.15625 | 466 | Academic Writing | Science & Tech. | 51.810437 |
Why the Number of Feet Matters
A recent feature on population in the Economist discusses economic challenges when a nation’s population falls. In this feature, “How to deal with a falling population”, 28 July 2007, the Economist tries to minimize concerns about world population by saying that we are “hardly near the po... | <urn:uuid:aa7465c6-c6ac-4354-a542-38bd130f0483> | 2.765625 | 1,062 | Comment Section | Science & Tech. | 43.654484 |
The Polar Marine Ecosystems respond to Rapid Climate Change by selective increased population growth, altering species location and mating grounds, and selective population decreasing. The warming climate change melts sea ice – vital to southern aquatic life – which causes a decline in Antarctic life to focus on one po... | <urn:uuid:95a6ad74-df8a-43e9-b22f-956527836c84> | 3.578125 | 226 | Comment Section | Science & Tech. | 25.399318 |
IS IT possible that our Universe exists inside a single magnetic monopole produced in the first split-second of creation? According to Andrei Linde of Stanford University in California, this idea has a lot going for it. Monopoles are hypothetical particles which carry a north or south magnetic pole.
Linde is one of the... | <urn:uuid:98ba8c75-c15e-457e-a10c-29d0497025b9> | 3.640625 | 209 | Truncated | Science & Tech. | 38.677416 |
The West Mata volcano erupted nearly 4,000 feet underwater in the Pacific Ocean
This is how island chains are born. Scientists spotted the deepest erupting volcano almost 4,000 feet below the Pacific Ocean's surface, and recorded the underwater fury by using the remotely operated submarine Jason.
The West Mata Volcano ... | <urn:uuid:03518c24-d215-4020-8523-ed2dca4ebc22> | 3.109375 | 124 | Content Listing | Science & Tech. | 34.680896 |
This chapter provides general information about writing trigger functions. Trigger functions can be written in most of the available procedural languages, including PL/pgSQL (Chapter 36), PL/Tcl (Chapter 37), PL/Perl (Chapter 38), and PL/Python (Chapter 39). After reading this chapter, you should consult the chapter fo... | <urn:uuid:fe96a08a-1e7a-4e26-bd27-743774712357> | 3.671875 | 1,810 | Documentation | Software Dev. | 38.423117 |
Advanced Laboratory and/or Demonstration Apparatus
Apparatus Title: Polarization of reflected light
Abstract : The apparatus consists of a ray box, an acrylic prism, a glass slide, and a polarizing sheet. The apparatus can demonstrate polarization of reflected light at the Brewster angle and variation of the level of p... | <urn:uuid:0805eabe-18d4-4fef-a2f2-005c3a60bb02> | 3.640625 | 352 | Academic Writing | Science & Tech. | 36.598327 |
The predicted effects of global warming are many and various, both for the environment and for human life.
There is some speculation that global warming could, via a shutdown or slowdown of the thermohaline circulation, trigger localised cooling in the North Atlantic and lead to cooling, or lesser warming, in that regi... | <urn:uuid:2f9b2df2-ecc8-4d8d-bc38-c7d35eac8b88> | 3.015625 | 162 | Knowledge Article | Science & Tech. | 25.805357 |
Between the river and deep blue Gulf: The past and future of oysters in Florida's Big Bend
Oyster reefs offer diverse ecological and social services for people and natural environments; unfortunately, reefs are also highly sensitive to impairment from natural and human-induced disturbances. Florida's Big Bend coastline... | <urn:uuid:ae4f0e5b-f121-40a1-90b4-b9c5e98a668b> | 3.90625 | 378 | Knowledge Article | Science & Tech. | 27.721368 |
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2001 June 3
Explanation: Last March, telescopic instruments in Earth and space tracked a tremendous explosion that occurred across the universe. A n... | <urn:uuid:d5fe6e5d-33ea-476e-9cd6-80cb196aba48> | 3.390625 | 371 | Knowledge Article | Science & Tech. | 40.168487 |
In 1872, the HMS Challenger left Portsmouth on a daring mission, but it didn’t set sail as a military ship. It had been retrofitted, not to project power, but to humbly petition the ocean to give up some of its secrets. Over three and a half years, the Challenger and its crew of over 200 (at the start, that is) circumn... | <urn:uuid:8695da67-3186-478a-a3c4-4d8a9171d684> | 3.859375 | 759 | Knowledge Article | Science & Tech. | 42.654649 |
In this case, he's been playing around with a brand new Garmin etrex H GPS receiver. Among other things it allows you to store a time sequence of position measurements, a so-called track, which you can then upload on Google maps to see which part of the forest you've been straying around in. This cute high-tech gadget ... | <urn:uuid:fc9043c4-b3f7-47e2-8a25-3c999027aa3d> | 3.1875 | 709 | Personal Blog | Science & Tech. | 34.566352 |
Washington, February 24 (ANI): Researchers from Amherst College and The University of Texas at Austin have proposed a new technique to probe Earth's deep interior that relies on a "fifth force of nature".
Making a breakthrough in the field of particle physics, they have established new limits on what scientists call "l... | <urn:uuid:ce18ad2e-e64d-40b6-bcee-7eec75849dff> | 3.328125 | 833 | Truncated | Science & Tech. | 28.700235 |
|λ, k, Sometimes shortened to: conductivity a measure of the ability of a substance to conduct heat, determined by the rate of heat flow normally through an area in the substance divided by the area and by minus the component of the temperature gradient in the direction of flow: measured in watts per metre per kelvin|
... | <urn:uuid:0906acf3-0ec6-45ee-9d24-34a1a4f2be91> | 3.578125 | 154 | Structured Data | Science & Tech. | 29.173317 |
By Paul Rincon
Science reporter, BBC News, Houston
Enough water is locked up at Mars' south pole to cover the planet in a liquid layer 11m (36ft) deep.
The Mars Express probe used its radar instrument to map the thickness of Mars' south polar layered deposits.
Analysis of the Marsis radar data shows that the polar depo... | <urn:uuid:c483bcc4-94d7-4868-9601-7d97f0b8c7a7> | 3.5625 | 729 | Truncated | Science & Tech. | 47.864985 |
Major Section: PROGRAMMING
(Reverse x) is the result of reversing the order of the
elements of the list or string
The guard for
reverse requires that its argument is a true list
or a string.
Reverse is defined in Common Lisp. See any Common Lisp
documentation for more information. | <urn:uuid:738267fc-0cb2-494b-b374-df8b51fcf2da> | 2.875 | 70 | Documentation | Software Dev. | 50.407687 |
Measurable (Extended) Real-Valued Functions
For a while, we’ll mostly be interested in real-valued functions with Lebesgue measure on the real line, and ultimately in using measure to give us a new and more general version of integration. When we couple this with our slightly weakened definition of a measurable space, ... | <urn:uuid:ec83755c-f600-41bc-98f3-31d1d53e7df2> | 2.921875 | 529 | Academic Writing | Science & Tech. | 40.520115 |
Learn more physics!
I have been unable to find this question answered and you guys have the most user friendly website I have found. My questions is:
What materials would prevent two magnets from attracting to each other when placed between them?
Melbourne, Victoria, Australia
Magnetic fields don't penetrate type I sup... | <urn:uuid:093b04f4-eaf9-41f5-8f98-c0a8aac89bb6> | 2.984375 | 238 | Q&A Forum | Science & Tech. | 58.888182 |
Planetary nebulae are hot glowing gas clouds ejected by dying low- to intermediate-mass stars. The nebulae glow because they are heated by energetic ultraviolet photons from the exposed stellar core. According to Kirchhoff's laws, the light produced by a planetary nebula should be an emission spectrum, with spikes of e... | <urn:uuid:046ffe23-4378-4928-b70e-a7a23a9215e3> | 4.21875 | 985 | Tutorial | Science & Tech. | 39.026309 |
This Week: Ancient water = ancient habitat?
In the News: Flying virus!
Coming Thursday: Roaches: A lot smarter than you thought!
Typically, the swirl of stormy weather obscures the cells at the heart of severe thunderstorms. This uncommonly clear view of an entire thunderstorm cell, with the top of the growing cumuloni... | <urn:uuid:e80aadaa-8478-4d2c-b29b-e73ed84486fc> | 3.375 | 1,254 | Content Listing | Science & Tech. | 52.283929 |
Educational - Cap
Back to: Weather Q & A
In order for thunderstorms to develop, the air near the surface must be buoyant. Just like air bubbles in water. Since air is less dense then water, any air bubbles released in water float to the surface, they are buoyant.
So, think of thunderstorm clouds as being almost like th... | <urn:uuid:e147bb50-511d-4bd4-89fe-a26ec343cfc1> | 4.1875 | 721 | Knowledge Article | Science & Tech. | 69.255953 |
ABOUT DIAMONDS: Diamond is a crystalline form of pure carbon that forms under intense heat and pressure. Conditions found in volcanic pipes or when meteors strike the earth can create shock zones of high pressure and temperature. Diamond is the hardest known naturally occurring material, which is why it is popular for ... | <urn:uuid:71344aaf-c1c8-44f1-a959-372da7ced688> | 4.09375 | 258 | Knowledge Article | Science & Tech. | 37.107401 |
MPG or mpg is a three letter abbreviation with multiple meanings, including:
- miles per gallon, see fuel efficiency. Used alone, "mpg" is ambiguous, because US and imperial gallons are significantly different (quoted vehicle fuel efficiency is therefore significantly different for the same vehicle in the US and UK). M... | <urn:uuid:78d5bc4e-1210-497d-87a6-fb6fece7a195> | 3.25 | 126 | Knowledge Article | Science & Tech. | 36.441023 |
Tag Archives: solar thermal
Scientists at Airlight Energy have joined IBM and the Swiss universities, ETH Zurich and Interstate University of Applied Sciences, to develop an affordable photovoltaic system that is capable of concentrating sunlight 2,000 times onto hundreds of one centimetre square PC cells – yielding hi... | <urn:uuid:32107d9c-3b41-45c2-81b8-0ddfc586f4c0> | 3.25 | 1,165 | Content Listing | Science & Tech. | 26.315612 |
What I am trying to do is discover servers on the same subnet.
I believe that multicast UDP is the standard sort of way for solving this problem. (At least that's what I've done before, and IIRC it's what JINI service discovery is based on). It's really simple (and fast). Your server just broadcasts a small id-string o... | <urn:uuid:8e9b5034-238b-4d6c-9983-91e78d10ce21> | 2.828125 | 494 | Q&A Forum | Software Dev. | 80.271212 |
Example #1 (Sound Intensity): The relationship between the number of decibels B and the intensity of a sound I in watts per centimeter squared is given by:
Determine the intensity of a sound I if it registers 125 decibels on a decibel meter.
In examples #2 and 3, compare the intensities of the two earthquakes.
|San Fra... | <urn:uuid:95b56905-f7f5-40b5-a753-237d979ebf39> | 3.953125 | 329 | Tutorial | Science & Tech. | 71.279885 |
Precipitation, evaporation, and transpiration are all terms that sound familiar, yet may not mean much to you. They are all part of the water cycle, a complex process that not only gives us water to drink, fish to eat, but also weather patterns that help grow our crops.
Water is an integral part of life on this planet.... | <urn:uuid:b1d81454-d95a-4e04-946e-6fa11b61bc16> | 3.640625 | 278 | Knowledge Article | Science & Tech. | 71.293122 |
Emilie Bigorgne of the Université Paul Verlaine – Metz and colleagues suggest that the increasing production of nanomaterials will in turn increase the release of nanosized by-products to the environment. Whether or not these particles will accumulate or be degraded and whether or not they pose an ecological risk depen... | <urn:uuid:0383b99e-b7b4-4287-b722-ee9f4f36ff66> | 2.875 | 241 | Content Listing | Science & Tech. | 20.080514 |
Climate Change Impacts, Adaptation and Vulnerability - Present and Future
A second report from the Intergovernmental Panel on Climate Change (IPCC) shares the current scientific understanding of how people and natural ecosystems are affected by climate change, and how they will be affected by future warming (in Februar... | <urn:uuid:e20bafc2-1f2b-4c4a-a01d-82bed5a55775> | 3.609375 | 561 | Knowledge Article | Science & Tech. | 29.781014 |
In probability theory, a conditional expectation (also known as conditional expected value or conditional mean) is the expected value of a real random variable with respect to a conditional probability distribution.
The concept of conditional expectation is extremely important in Kolmogorov's measure-theoretic definiti... | <urn:uuid:f8a32539-85d3-46af-84d5-8427e95ede25> | 3.796875 | 1,827 | Knowledge Article | Science & Tech. | 40.689196 |
I want a brief intro to lexical scope
I understand them through examples :)
First, Lexical Scope (also called Static Scope), in C-like syntax:
Every inner level can access its outer levels.
There is another way, called Dynamic Scope used by first implementation of Lisp, again in C-like Syntax:
will print 5
will print 1... | <urn:uuid:d9da69b7-fbb4-488e-aec2-1f57e4a9aa6a> | 3.5625 | 803 | Q&A Forum | Software Dev. | 43.646411 |
The Spacecraft Bus
The Mars Express spacecraft has been designed to take a payload of seven state-of-the-art scientific instruments and one lander to the red planet and allow them to record data for at least one Martian year, or 687 Earth days. The spacecraft also carries a data relay system for communicating with Eart... | <urn:uuid:a5c16a22-906e-48bb-a4b8-fc90e0beb8bd> | 3.3125 | 236 | Knowledge Article | Science & Tech. | 64.620179 |
London, June 18 (ANI): A theory put forward by researchers working at two Spanish universities has challenged the popular adage that time speeds up as we age.
The radical theory by academics suggests that time itself could be slowing down - and may eventually grind to a halt altogether in billions of years time.
The la... | <urn:uuid:68b84031-076c-469c-9481-24ade622af08> | 2.90625 | 263 | Truncated | Science & Tech. | 43.342694 |
Let's say two comets crashed into each other. If it was 0.1 AU away from the Earth, would the collision cause mass destruction here, or not affect us at all?
It depends. There are collisions amongst asteroids that have been caught on film that had no effect on us whatsoever. In your scenario, they would have to have a ... | <urn:uuid:2a1d0c26-7431-4c7b-9166-223483cbccc2> | 3.296875 | 373 | Q&A Forum | Science & Tech. | 67.333015 |
Yesterday, the Space Shuttle Atlantis docked with the Hubble Space Telescope, and now the removal and replacement of WFPC2 has commenced.
As you probably know, I’m going to miss that camera. It’s been unveiling the secrets of the Universe for the last 16 years, and in a way that no other camera ever has before. So, you... | <urn:uuid:f86a6b8d-1eba-4156-9891-fb97dda8ace7> | 2.78125 | 713 | Personal Blog | Science & Tech. | 57.547051 |
|Hash and Hash Iterator Object Language Elements|
|Applies to:||Hash object|
|rc=object.EQUALS(HASH: 'object', RESULT: variable name);|
specifies whether the method succeeded or failed.
A return code of zero indicates success; a nonzero value indicates failure. If you do not supply a return code variable for the method... | <urn:uuid:1d550780-3e71-40ae-a082-482ce050d9ed> | 3.359375 | 544 | Documentation | Software Dev. | 67.36819 |
1,700 billion metric tonnes of carbon dioxide. That's twice the current record amount of atmospheric CO2. 1,700 billion metric tonnes is the estimated amount of CO2 held in the northern hemisphere's permafrost that is now at risk of being released.
A report of the U.N. Environment Programme released at the Doha climate... | <urn:uuid:0a90f6f6-8af1-4b13-9e00-97c89256b2ee> | 3.625 | 322 | Personal Blog | Science & Tech. | 45.411671 |
Circle Sector, Segment,
Chord and Arc Calculator
Scroll to the bottom for the Circle Calculator
Click here for the formulas used in this calculator.
Lines AO and OB are called radii.
Lines AC, BC and AB are called chords.
The angle ACB is an inscribed angle.
The angle AOB is a central angle.
The curved blue line AB is ... | <urn:uuid:2f593676-62f7-4a20-a5e3-537335a8375d> | 3.859375 | 338 | Tutorial | Science & Tech. | 58.03963 |
PLATE MOVEMENTS AND CLIMATE CHANGE
Karen L. Bice
Department of Geosciences
Pennsylvania State University
University Park, PA 16802
Level: Grades 7 and above
Estimated Time Required: 50 minutes
Anticipated Learning Outcomes
Climate is simply weather "averaged" over a time period of one year or more. In general terms, th... | <urn:uuid:31dbc2c9-4cbc-46a2-b7c5-b3bb8e8577ed> | 3.640625 | 1,102 | Tutorial | Science & Tech. | 43.547053 |
Links Between Hydrothermal Environments, Pyrophosphate, Na+, and Early Evolution
The discovery that photosynthetic bacterial membrane-bound inorganic pyrophosphatase (PPase) catalyzed light-induced phosphorylation of orthophosphate (Pi) to pyrophosphate (PPi) and the capability of PPi to drive energy requiring dark rea... | <urn:uuid:26026cf1-3015-4f1b-8993-36749132d52c> | 3.453125 | 320 | Academic Writing | Science & Tech. | 25.382516 |
• Family: Percidae (Perches and darters)
• Other Names: None
• Ohio Status: Threatened
• Adult Size: Typically 1-2 inches, can reach 2.5 inches.
• Typical Foods: May fly larvae, midge larvae, and other aquatic invertebrates.
The channel darter is a small slender fish and has 10 to 15 small oblong dark blotches along th... | <urn:uuid:9747dbd6-d9fc-464c-9720-0f1a07a478c7> | 3.109375 | 352 | Knowledge Article | Science & Tech. | 52.883181 |
Scientists classify the
severity of solar flares according to the amount of X-rays
they emit, known as X-ray flux. The GOES satellite measures
the X-rays coming from the sun at any given time—see
the graph of live data below.
Looking at this graph, you can easily identify
flares as sharp spikes—the higher the spike, th... | <urn:uuid:6d2410aa-b6c0-4e1f-ba3d-d5488c4cf417> | 3.734375 | 157 | Knowledge Article | Science & Tech. | 48.816975 |
"Exploring Products - Computer Hard Drives" is a hands on activity in which visitors use floating ring magnets to store data. They learn that computer hard drives are one of the most common applications of nanotechnology.
"Exploring Materials - Memory Metal" is a hands on activity in which visitors compare the properti... | <urn:uuid:eb45645b-0bd6-48b6-85be-742accdf1c1b> | 3.390625 | 664 | Content Listing | Science & Tech. | 27.857638 |
|MySQL Conference and Expo April 14-17, 2008, Santa Clara, CA|
CSS also allows for comments, but it uses a completely different
syntax to accomplish this. CSS comments are very similar to C/C++ comments, in
that they are surrounded by
Comments can span multiple lines, just as in C++:
It's important to remember that CSS... | <urn:uuid:ae5534aa-87f2-4ed7-a04b-4d1cb9048a1f> | 2.6875 | 483 | Documentation | Software Dev. | 40.284889 |
PostgreSQL provides a large number of functions and operators for the built-in data types. Users can also define their own functions and operators, as described in Part V. The psql commands \df and \do can be used to show the list of all actually available functions and operators, respectively.
If you are concerned abo... | <urn:uuid:2c2eb61c-bf0f-454f-94fb-a6237ae33bbe> | 2.75 | 200 | Documentation | Software Dev. | 40.048485 |
In a sense solar energy is all about the future. Right now we have the capability to fulfil all of our energy needs from other sources, non-renewable sources like oil, natural gas and coal. But these won’t last forever, so when they run out, or become so scarce that there isn’t enough to go around anymore, we will eith... | <urn:uuid:5431028d-8015-4029-be7a-fb8f853e37ac> | 2.921875 | 626 | Knowledge Article | Science & Tech. | 43.181185 |
Climate change may spur the destruction of ozone in unexpected parts of the globe.
In a warming world, many scientists believe, severe weather will become more common. That could be a problem in part because powerful rainstorms have the potential to erode ozone above the United States, researchers report online July 27... | <urn:uuid:1c942576-44fd-41d5-beac-d5584bb48dff> | 3.71875 | 265 | Content Listing | Science & Tech. | 36.866336 |
A software design pattern is a three-part rule which expresses a relation between a certain context, a problem, and a solution. The well-known "GoF Book" describes 23 software design patterns. Its influence in the software engineering community has been dramatic. However, Peter Norvig notes that "16 of [these] 23 patte... | <urn:uuid:ba0e752e-65c6-49b9-9877-b8c0043d3c54> | 3 | 399 | Academic Writing | Software Dev. | 51.668935 |
How can I create customized classes that have similar properties as 'str'?
hniksic at xemacs.org
Sun Nov 25 02:48:30 CET 2007
Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> On Sun, 25 Nov 2007 01:38:51 +0100, Hrvoje Niksic wrote:
>> samwyse <samwyse at gmail.com> writes:
>>> create a hash that maps... | <urn:uuid:48685521-a44f-4deb-a51a-72d25c556821> | 2.75 | 531 | Comment Section | Software Dev. | 62.235504 |
The function cos2x has a period of 2x=2pi, x=pi
The function y=(cos2x)^2 has a period of what? By looking at a graph of the function it is pi/2, but the answer in the book says pi.
Thanks for any help offered.
Thus we have
This means that or if you don't understand this, this means that :
<< difference of two squares :... | <urn:uuid:f0995f94-3220-4e1f-a9c7-16ec41838a4b> | 4.1875 | 569 | Q&A Forum | Science & Tech. | 90.835326 |
Defines size, enumerators, and synchronization methods for all nongeneric collections.
Assembly: mscorlib (in mscorlib.dll)
Thetype exposes the following members.
|AsParallel||Enables parallelization of a query. (Defined by ParallelEnumerable.)|
|AsQueryable||Converts an IEnumerable to an IQueryable. (Defined by Querya... | <urn:uuid:f60c66a0-49ee-4b4e-a51b-5eaf24a7e7ed> | 2.78125 | 338 | Documentation | Software Dev. | 29.46654 |
This post is a guest contribution by Colin Beale, a research fellow at the University of York who studies ecology in Tanzania. Colin writes about the living community of the savannah, from butterflies to wildebeests, with co-blogger Ethan Kinsey at Safari Ecology. If you have an idea for a post, and you’d like to contr... | <urn:uuid:1acf3041-962b-4e2d-84a6-18f8feb19be8> | 3.046875 | 2,007 | Personal Blog | Science & Tech. | 47.726935 |
Formation of a Reconnection Site
A numerical simulation based on a global MagnetoHydroDynamic (MHD) model was run to reproduce the 8 May 2004 event. This image shows the topology of the magnetic field produced by the global MHD model around 10:00 UT, viewed from the direction of the Sun. Earth is represented by the blu... | <urn:uuid:b247be7a-a3a8-4cd4-b9d2-25f5dbe36bc7> | 3.0625 | 149 | Knowledge Article | Science & Tech. | 38.15948 |
stoilis writes "A collaboration between Deborah Gordon, a Stanford ant biologist, and Balaji Prabhakar, a computer scientist, has revealed that the behavior of harvester ants, as they forage for food, mirrors the protocols that control traffic on the Internet. From the article: 'Prabhakar wrote an ant algorithm to pred... | <urn:uuid:3f4906c1-6a34-4751-bd04-8da2395465bb> | 2.734375 | 175 | Comment Section | Science & Tech. | 41.705694 |
Science subject and location tags
Articles, documents and multimedia from ABC Science
Wednesday, 1 December 2010
StarStuff Podcast Have scientists discovered the universe before its creation? Plus: evidence reveals liquid universe moments after Big Bang; and super-tankers to detect secret nuclear facilities.
Friday, 26... | <urn:uuid:66f848df-1fc6-4c35-b891-712e6ecb5315> | 2.90625 | 643 | Content Listing | Science & Tech. | 42.340894 |
Fire acts differently in space than on Earth. This artwork is comprised of multiple overlays of three separate microgravity flame images. Each image is of flame spread over cellulose paper in a spacecraft ventilation flow in microgravity. The different colors represent different chemical reactions within the flame. The... | <urn:uuid:604401e6-3904-48db-abe0-8008919074ff> | 3.46875 | 175 | Knowledge Article | Science & Tech. | 29.027717 |
This is light, fast and simple to understand mathematical parser designed in one class, which receives as input a mathematical expression (System.String) and returns the output value (System.Double). For example, if you input string is "√(625)+25*(3/3)" then parser return double value — 50.
The idea was to create a str... | <urn:uuid:eb204a1f-8120-4d11-b609-f3e527c211bd> | 3 | 661 | Documentation | Software Dev. | 69.857071 |
Sub-tropical Ridge (STR)
The STR is a natural high pressure belt that sits across the southern parts of Australia.
We have detected that the browser used to view this content is missing the supported 'Flash plugin'.
Once you have installed the 'plugin' found on the Adobe website, please return to this web page by using... | <urn:uuid:a5edb255-1acd-48a8-8954-467ef5143a5c> | 3.5 | 280 | Knowledge Article | Science & Tech. | 50.035655 |
No longer is David Braaten constantly cocooned in his red super parka. He left the insta-freeze winds of the Antarctic interior in January.
But as cold as the trip was for the University of Kansas scientist, he recognizes what one discovery after the next has demonstrated this year: Itís getting remarkably warm down th... | <urn:uuid:9b7dd297-1f5f-4531-9aba-66a4064e5f56> | 3.0625 | 278 | Truncated | Science & Tech. | 43.65958 |
The top 100 carbon dioxide-producing facilities in California generated 101,890,944 metric tons of CO2 in 2007, according to data recently released by the California Air Resources Board. We’ve mapped that data to show where the 100 largest polluters are located. Power plants and oil refineries appear to be the largest ... | <urn:uuid:1d4b0a94-71bf-4186-9882-4a9a912270c5> | 2.890625 | 417 | Knowledge Article | Science & Tech. | 37.691405 |
|Date||2006-10-31 to 2006-12-26|
|Total Depth||1284.85 m|
ANDRILL McMurdo Ice Shelf (MIS) Project
The key aim of the MIS Project is to determine past ice shelf responses to climate forcing, including variability at a range of timescales. To achieve this aim ANDRILL will recover core from beneath the McMurdo Ice Shelf. ... | <urn:uuid:d93e633d-4fef-4e5a-819a-5930ef602abf> | 3.03125 | 227 | Knowledge Article | Science & Tech. | 50.031635 |
Missing Link To Crocodile/Avian/Mammalian Past Rediscovered At Museum of Natural History
By Elaine Meinel Supkis
Researchers noticed what looked like a crocodile ankle poking out of a very old cast stored in the Museum's back rooms. Upon opening it, the fossil, which hasn't been seen in many years, turned out to be an ... | <urn:uuid:304bd1be-f02a-4a77-b139-06bd4a9100e1> | 2.9375 | 1,344 | Truncated | Science & Tech. | 30.309773 |
Assignment statements are used to (re)bind names to values and to modify attributes or items of mutable objects:
(See section 5.3 for the syntax definitions for the last three symbols.)
An assignment statement evaluates the expression list (remember that this can be a single expression or a comma-separated list, the la... | <urn:uuid:6fa39f44-22be-4db5-9441-fe9ec1b87ced> | 2.953125 | 588 | Documentation | Software Dev. | 51.178885 |
Most western nations advance the clock ahead 1 hour during summer months. This period is called daylight saving time. This period lasts from 1st Sunday in april to last Sunday in October in most of the united states, mexico and canada. The nations of EU observe daylight saving time but they call it summer time period. ... | <urn:uuid:74e0059b-6660-4b72-a4a6-523daf6868df> | 2.765625 | 2,342 | Documentation | Software Dev. | 38.81401 |
Now that you know what test-first means and how you can build a testable architecture, you are ready to start writing some real unit tests. This chapter will explain what kind of assertions you have, how a good unit test is set up and more.
Mocks vs. Stubs
Before I start explaining how to build a unit test, I will firs... | <urn:uuid:8e989258-9477-452e-9cc2-7e81aab47c8c> | 3.3125 | 1,124 | Documentation | Software Dev. | 50.680279 |