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Proving ?R² Using Chains, a Ruler, and Sixty Seconds
In this brief video, Minute Physics shows a visual proof demonstrating why ?R² gets you the area of a circle. By using various lengths of chain laid into a circular shape, you can make a triangle from the circle -- and from there it's a hop, skip, and a trigonometry ... | <urn:uuid:cea8c368-52d2-4648-850c-f618deec2348> | 3.25 | 132 | Truncated | Science & Tech. | 68.671028 |
The Universe Revealed by Subaru Telescope Ⅲ
The Milky Way and its Group
Our solar system belongs to a large spiral-shaped group of stars called the Milky Way Galaxy, which is about 100,000 light years across. The next nearest large galactic neighbor is the Andromeda Galaxy (M31), located 2.5 million light-years away. I... | <urn:uuid:165dc187-2b42-4695-a026-239367bb4b97> | 3.75 | 741 | Knowledge Article | Science & Tech. | 42.826174 |
Q1 A common feature of all life on Earth is...
Q2 If extraterrestrials had visited Earth at some random time
between the Earth's formation and now, what kind of life forms would they
most likely have found
stone age humans
humans with radio telescopes
dinosaurs and insects
Q3 Which of the following ideas is NOT being d... | <urn:uuid:7a9e56ea-9b69-4ba5-be0e-68d862ede046> | 3.15625 | 1,432 | Q&A Forum | Science & Tech. | 47.66488 |
My question is driven by the plot below. We see that acceptable operating range of a motor is between 50-100% of the rated load. Below 40% or so the efficiency of the motor drops off dramatically.
What is the cause of this phenomenon?
First, efficiency of an electric motor is just output power divided by input power. I... | <urn:uuid:d992cc07-cfe0-4cef-94bf-f0719f8d6f04> | 2.890625 | 299 | Q&A Forum | Science & Tech. | 62.148702 |
As the autumn leaves turn handsomely, I’ve been wondering, why do trees bother? It’s a question scientists have been asking for the past few years, and for the first time, they’ve carried out an experiment to find out.
The color of an autumn leaf can actually take a lot of work. In the fall, the green chlorophyll in a ... | <urn:uuid:36c93807-1fc9-496d-804a-42b70f0b157b> | 3.890625 | 1,103 | Personal Blog | Science & Tech. | 60.361702 |
Academics at the Universities of Bristol, Yale and Calgary have shown that prehistoric birds had a much more primitive version of the wings we see today, with rigid layers of feathers acting as simple airfoils for gliding.
Close examination of the earliest theropod dinosaurs suggests that feathers were initially develo... | <urn:uuid:39e55209-472b-459e-aadb-ff17a8b1f023> | 4.4375 | 527 | Personal Blog | Science & Tech. | 30.803764 |
Featured Scientist: David G. McGrath, Ph.D. Associate Scientist
Project: Human ecology and management of the Amazon floodplain
The Amazon varzea, the core area of the Amazon floodplain, is one of the largest and most biodiverse tropical wetland systems in the world. Its fertile soils and abundant plant and animal resou... | <urn:uuid:e114fb30-3aae-4d7a-a28a-70f21b8499d0> | 3.484375 | 290 | Truncated | Science & Tech. | 20.016667 |
¨ is injective if and only if different inputs give different outputs.
¨ is injective if and only if “different elements of A go to different elements of B.”
¨ It is the whole function that is or is not injective.
¨ The articles about most of the example functions state whether they are injective or not. Checking each ... | <urn:uuid:0945305e-e17b-4cbc-a1e8-190848e4baef> | 3.6875 | 955 | Knowledge Article | Science & Tech. | 56.154743 |
|Auroras can make spectacular sights.
Photographed above last weekend, flowing multi-colored auroras helped
illuminate a busy sky above
spectacular aurora pictured above,
the photographer caught three satellites streaks, one airplane streak, and a
friend trying to
the same sight.
Although auroras might first appear to ... | <urn:uuid:96be8006-55fa-40d2-9626-aaf880566f45> | 3.34375 | 183 | Knowledge Article | Science & Tech. | 40.131936 |
Bryde's whale, tropical whale
Little is known about Bryde's whales and they are often confused with sei whales.
Possibly two (offshore and inshore), and maybe a third, dwarf subspecies around the Solomon Islands.
Up to 72 years.
Body length: 11.5-14.5m, Weight: 12-20 tonnes.
Bryde's whales are very similar to sei whale... | <urn:uuid:4c457cf7-6448-4213-9796-10e37353a09b> | 3.140625 | 211 | Knowledge Article | Science & Tech. | 71.667808 |
Simply begin typing or use the editing tools above to add to this article.
Once you are finished and click submit, your modifications will be sent to our editors for review.
...diameter antenna near Effelsberg, Ger.; the Australian Commonwealth Scientific and Industrial Research Organization (CSIRO) 64-metre (210-foot)... | <urn:uuid:644fb2fb-944f-40a0-b7c3-63b1e8f222dc> | 3.203125 | 234 | Truncated | Science & Tech. | 43.767406 |
Global warming news and climate change headlines for March 2008
March 31 - Australia's love affair with cars cranks emissions
The Australian state of Victoria has experienced an overall carbon
emission increase of 12.6% since 1990 with transport associated
emissions being the major contributor, skyrocketing by 26.5% ov... | <urn:uuid:298bd6c7-3314-4b9c-acf7-aa2f30ab4334> | 2.765625 | 2,342 | Content Listing | Science & Tech. | 39.431632 |
I’ve put off writing about Wesley Traub’s paper on the frequency of planets in the habitable zone because I knew Adam Crowl had reservations about Traub’s method. We talked about this at the 100 Year Starship Symposium, which led to Adam’s agreeing to writing this piece for Centauri Dreams. How you define a habitable z... | <urn:uuid:45670bf4-28f3-406c-8aa2-6346ad57eae2> | 3.1875 | 1,509 | Nonfiction Writing | Science & Tech. | 60.382629 |
This topic deserves special attention because many people from database designers to application developers (sometimes one person does both) do not get it right. A Many-to-Many relationship occurs when each instance from the entity on the left can have many instances from the entity on the right, and vice versa.
Some e... | <urn:uuid:037f6064-e2a0-4c11-be75-7b0f33977b67> | 3.125 | 607 | Personal Blog | Software Dev. | 44.36562 |
When it comes to full-text indexing, we usually think of methods such as inverted indices that break text on word boundaries, consequently requiring search terms to be whole words only. Yet all of us probably have had the experience of searching for not-quite-words C++, VM/CMS, SQL*Plus, 127.0.0.1, <blink>, and the lik... | <urn:uuid:1c238001-944c-4fd7-8665-f7c369fc648f> | 2.9375 | 1,300 | Academic Writing | Software Dev. | 61.033227 |
Ancient Ecosystem Discovered Beneath Antarctic Glacier
Scientists have found life in an ecosystem trapped underneath a glacier in Antarctica for nearly 2 million years. The microbes, they suggest, are surviving the dark, oxygen-free waters by drawing energy from sulfur and iron. The findings provide insight into how li... | <urn:uuid:26e6eff9-5a4e-4c12-8618-d87c95516771> | 3.96875 | 330 | Truncated | Science & Tech. | 32.326272 |
The new Pythagoras
One of mathematics' best known theorems is that which is attributed to Pythagoras.
Pythagoras, however, had a rival, named Pyfudgerous.
He too had a theorem for working out the hypotenuse of
a right-angled triangle from the length of the other two sides.
I am confident that readers will have no diffi... | <urn:uuid:d549566b-e6e9-4008-8719-66f3335e174c> | 3 | 1,286 | Personal Blog | Science & Tech. | 58.510991 |
Chiricahua National Monument AQRV's
Most surface waters in Chiricahua NM are likely to be well-buffered and, as a result, insensitive to acidic atmospheric deposition because of an abundance of base cations in underlying park soils and rocks. However, studies currently underway have identified certain soils in the park... | <urn:uuid:587efa52-4661-4d0c-9651-8479bf115231> | 3.53125 | 464 | Knowledge Article | Science & Tech. | 20.830164 |
Generating Graphics With Piddleby Michal Wallace
You probably know by now that Python's flexible data structures make working with complex data a breeze. Did you know Python also makes it a snap to visualize your data in vibrant color?
Thanks to the slew of graphics modules people have built, Python is a handy language... | <urn:uuid:a0845093-1ce8-4deb-94e9-53179146b469> | 2.703125 | 1,598 | Documentation | Software Dev. | 63.990474 |
Global fisheries receive billions of dollars in subsidies each year. Although some of this money, such as that to improve fisheries management, can promote sustainable fishing practices, other funding can lead to overfishing in the world’s oceans. Capacity-enhancing subsidies, for example for fuel or boat construction, red... | <urn:uuid:9d8b2e5c-c2c0-4092-9b07-b067ce66155d> | 3.21875 | 266 | Knowledge Article | Science & Tech. | 22.01376 |
OPEN cursor_name OPEN cursor_name USING value [, ... ] OPEN cursor_name USING SQL DESCRIPTOR descriptor_name
OPEN opens a cursor and optionally binds actual values to the placeholders in the cursor's declaration. The cursor must previously have been declared with the DECLARE command. The execution of OPEN causes the qu... | <urn:uuid:69169b99-23f3-4892-9962-e0dd61c245ea> | 2.75 | 325 | Documentation | Software Dev. | 56.121193 |
String replaceAll in java
In this section you will learn about replaceAll() method in java, This will replace each of the sub string with the given replacement. This method will return the resulting string..
Split in java
This section illustrate the use of split in java. Split is used to split the string in the given f... | <urn:uuid:e91862c5-9c86-4844-8490-e9f2bba14e11> | 3.921875 | 2,710 | Content Listing | Software Dev. | 48.462209 |
Web edition: June 15, 2012
Print edition: June 30, 2012; Vol.181 #13 (p. 26)
Arguably, and it would be a tough argument to win if you took the other side, computers have had a greater impact on civilization than any other machine since the wheel. Sure, there was the steam engine, the automobile and the airplane, the pr... | <urn:uuid:939ee34a-3711-4e56-ae18-216fe2c0cf05> | 3.46875 | 2,804 | Knowledge Article | Science & Tech. | 37.696996 |
Dear Astronomers: […] I've poured through my roughly 200 astronomy books and can't find an answer to this question asked by a boy at one of my recent talks: Why do the outer gas giant planets [generally] rotate faster than the inner planets? I was shocked at first because I realized I should know that! The best I could... | <urn:uuid:4cb4b674-79a5-49c4-bcd8-7d5c9dac6689> | 3.0625 | 401 | Q&A Forum | Science & Tech. | 46.137697 |
All-Wavelengths Galactic Center
In celebration of the International Year of Astronomy 2009, NASA's Great Observatories -- the Hubble Space Telescope, the Spitzer Space Telescope, and the Chandra X-ray Observatory -- have collaborated to produce an unprecedented image of the central region of our Milky Way galaxy.
In th... | <urn:uuid:ca158c08-cd95-4f0a-ae10-6adf589306b9> | 3.890625 | 406 | Truncated | Science & Tech. | 41.392778 |
Hop, skip and jumping robots
February 11, 2013 |
Jumping robots powered by a combustion engine? Sounds like something from 1930s sci-fi.
New leaps and bounds in heat-resistant materials mean soft-bodied silicon robots can now use controlled explosions, like those in car engines, to make them jump really high.
An electr... | <urn:uuid:70bf8da2-e964-443d-91b1-81cabe981f69> | 3.34375 | 169 | Truncated | Science & Tech. | 71.374421 |
Differential Absorption Lidar (DIAL)
Light is absorbed by many of the atmospheric components. Absorption of light by molecules is the basis for DIAL which is used to measure the atmospheric concentrations of gases such as water vapor and ozone.
DIAL Measurements of Water Vapor
As shown in figure (a), water vapor has ma... | <urn:uuid:2beebe7c-8aaa-4c3d-80fc-4a5dce1df539> | 4.125 | 330 | Knowledge Article | Science & Tech. | 22.809924 |
Tourmaline is easy to recognize. This Chinese tourmaline specimen, shown about twice life size, displays the typical crystal shape of a nine-sided prism. It also displays the typical striations along the long axis and the glassy luster. Its hardness is 7 to 7.5, its streak is white, and it has poor cleavage. Tourmaline... | <urn:uuid:3238a0a1-4857-484a-acf4-631dbb08e1dc> | 3.0625 | 311 | Knowledge Article | Science & Tech. | 36.913313 |
Between the Galaxies
Name: bryan matthewkarp
Date: 1993 - 1999
What if any thing is in between galaxies, besides space?
How much cooler are sunspotsthan the actual surface of the sun?
Why is the sky sometimes green?
How are satellites named?
"empty" space between galaxies (extra-galactic space) actually
contains about ... | <urn:uuid:170a9f4e-2399-4901-8b9c-7da60e0ff802> | 3.1875 | 167 | Content Listing | Science & Tech. | 48.927714 |
Odonates as biological indicators of grazing effects on Canadian prairie wetlands
Article first published online: 27 MAY 2005
Volume 30, Issue 3, pages 273–283, June 2005
How to Cite
Lee Foote, A. and Rice Hornung, C. L. (2005), Odonates as biological indicators of grazing effects on Canadian prairie wetlands. Ecologic... | <urn:uuid:1fe80887-456a-4d0b-8a09-9151ec296f71> | 3.359375 | 510 | Truncated | Science & Tech. | 21.342857 |
(By masak and moritz)
Newcomers to the Perl programming language, version 5, often complain that
they can’t reverse strings. There’s a built-in reverse function, but it doesn’t seem to work at first glance:
$ perl -E "say reverse 'hello'" hello
When such programmers ask more experienced Perl programmers, the solution i... | <urn:uuid:02776515-42d9-4138-8c7f-3fd7de5967da> | 2.890625 | 660 | Personal Blog | Software Dev. | 56.919318 |
Blood clot, coloured scanning electron micrograph (SEM). Red blood cells (erythrocytes) and white blood cells (leucocytes, green) trapped within the fibrin mesh (yellow) of a fresh blood clot. Clots are formed in response to cardiovascular disease or injuries to blood vessels. White blood cells commonly occur in blood ... | <urn:uuid:2007721c-ac15-426a-ae42-dcb5ec41808c> | 3.59375 | 104 | Truncated | Science & Tech. | 35.944 |
Editor's note: The following column was co-authored by Alex Johnson, a post-doctoral fellow at Harvard University.
For the past several years--until the credit crisis--investors have flocked toward renewable energy. Their hope is that solar radiation can be harnessed directly and through intermediaries such as the wind... | <urn:uuid:6b7ba779-60ae-4245-947f-1023736357ef> | 3.59375 | 1,718 | Nonfiction Writing | Science & Tech. | 32.397655 |
Molar heat capacity
From Uncyclopedia, the content-free encyclopedia
Molar heat capacity is a measurable physical quantity that characterizes the ability of a mole to explode (or, in scientific terms, asplode.) It is defined as the rate of change of temperature as heat is added to a mole's body at the given conditions ... | <urn:uuid:8e3140d8-ea79-4669-92a0-fd89ded9055b> | 3.5625 | 846 | Knowledge Article | Science & Tech. | 49.293683 |
Thanks to one of the most productive spacecraft ever built, scientists are far better acquainted with the star that lights our world and gives us life. Built for ESA by European industry, the Solar and Heliospheric Observatory (SOHO) went into space on December 2, 1995.
The tenth anniversary of SOHO's launch is a time ... | <urn:uuid:88bdc9c8-6693-4e59-a6ec-448c6fc1f0b9> | 3.46875 | 918 | Knowledge Article | Science & Tech. | 38.935324 |
This is another post on open standards, a concept that affects all aspects of the mobile experience, from the processors and operating systems to carriers and devices and finally to the end user. When creating web-based content, XHTML and CSS set standards for open sourced coding structure and help to create a consiste... | <urn:uuid:ea62cf04-657d-469b-ae7e-b9e6bf37daa3> | 3.203125 | 746 | Personal Blog | Software Dev. | 34.963664 |
Translation - of a polygon
From Latin: translatus - "carried over,"
Moving a figure to a new location with no other changes.
Drag any orange dot to reshape the left (yellow) original figure. Drag the image (right, gray) to translate it to a new location.
To translate a figure is to simply slide it somewhere else. But i... | <urn:uuid:cc12f88a-469c-4d09-88f6-0ec821383584> | 3.828125 | 424 | Tutorial | Science & Tech. | 49.786801 |
How Pine Bark Beetles Created an Elaborate and Deadly Mess
By DINA FINE MARON of ClimateWire
Published: October 28, 2010
More News From ClimateWire
- Technology Companies Are Lining Up for Smart Grid Business
- European Renewables Industry Staggered First by Recession, Now by Budget Cuts
- The Arctic Shifts to a New Cl... | <urn:uuid:f487642d-ae0f-4ff5-b301-60380e707bdf> | 2.90625 | 931 | Truncated | Science & Tech. | 45.390027 |
The community wiki for GLIBC
The official and canonical GLIBC website is http://www.gnu.org/software/libc/
Any Unix-like operating system needs a C library: the library which defines the "system calls" and other basic facilities such as fopen, malloc, printf, exit etc.
The GNU C Library is used as the C library in the ... | <urn:uuid:ed48bde2-5e8c-43d0-8af3-ce51e2e47e2b> | 3.140625 | 1,081 | Knowledge Article | Software Dev. | 60.859511 |
The Rain-shadow Effect
Sheltered by mountains
by Philip Eden
"Rain shadow" is a phrase often used by meteorologists in their day-to-day work, and is occasionally mentioned by television weather forecasters. Some may regard it as a solecism, but it well describes the phenomenon whereby much less rain falls on the lee si... | <urn:uuid:8883653a-8aee-43cb-8b53-ebe9bd34cc3a> | 2.859375 | 365 | Nonfiction Writing | Science & Tech. | 48.883738 |
TEXTAREA - Multi-line Text Input
The TEXTAREA element defines a form control for the user to enter multi-line text input. While TEXTAREA is most useful within a FORM, HTML 4.0 allows TEXTAREA in any block-level or inline element other than BUTTON. However, Netscape Navigator will not display any TEXTAREA elements outsi... | <urn:uuid:fbce2fc6-6a88-4729-8221-563495a12ef0> | 2.75 | 656 | Documentation | Software Dev. | 40.277357 |
Tungsten: the essentials
Pure tungsten is a steel-gray to tin-white metal. Tungsten has the highest melting point and lowest vapour pressure of all metals, and at temperatures over 1650°C has the highest tensile strength. The metal oxidises in air and must be protected at elevated temperatures. It has excellent corrosi... | <urn:uuid:2c0fde25-fe72-4273-8b07-11be50eb012b> | 2.9375 | 228 | Knowledge Article | Science & Tech. | 38.422224 |
FishBaseFishBase is a comprehensive database of information about fish.
As of 2003, it included descriptions of over 27,000 species, over 137,000 common names in hundreds of languages, over 34,000 pictures, and references to over 29,000 works in the scientific literature.
In 1987, Daniel Pauly, inspired by cataloging w... | <urn:uuid:e3c0fae9-763b-4561-a5d7-f74cf0608fca> | 2.96875 | 467 | Knowledge Article | Science & Tech. | 36.067357 |
Partial Pressure and Kp
In a mixture of two or more gases, each component gas contributes to the total pressure of the system. For example, the earth's atmosphere is made up of (by mole percent) 78% nitrogen, 21% oxygen, .9% argon, .03% carbon dioxide, and other trace gases. Each gas contributed to the total pressure o... | <urn:uuid:439c7842-81ef-46bb-9008-4aae2eac5679> | 3.765625 | 400 | Academic Writing | Science & Tech. | 62.557762 |
2007-10-28 / 19:59 / dave
From the wikipedia entry
Forth parsing is simple, as it has no explicit grammar. The interpreter reads a line of input from the user input device, which is then parsed for a word using spaces as a delimiter; some systems recognise additional whitespace characters. When the interpreter finds a ... | <urn:uuid:ed7f545e-027b-453e-a2af-30429432c2f2> | 3.859375 | 1,007 | Personal Blog | Software Dev. | 50.376964 |
At time there are talks about quantum computers and lot of talks and discussion on its exponential speed. But studying in some more details it makes reference to "Heisenberg uncertainty principle", which simply says that either position or momentum can be calculated for any electron. If we already know the limitation, ... | <urn:uuid:3b8c46d6-1647-4f0e-834f-e8cb5a5226ab> | 2.75 | 230 | Q&A Forum | Science & Tech. | 42.095508 |
Polar coordinatesThe representation of a complex number as a sum of a real and imaginary number, z = x + iy, is called its Cartesian representation.
Recall from trigonometry that if x, y, r are real numbers and r 2 = x 2 + y 2, then there is a unique number θ with 0 ≤ θ < 2π such that
sin(θ) = y / r.
That number is
|θ|... | <urn:uuid:cba335e3-a7f4-4777-8c73-6cfdf2fcd305> | 4.25 | 641 | Tutorial | Science & Tech. | 80.570712 |
Monday, April 4, 2011
Energy: Understanding Nuclear Energy
In light of recent events in Japan, or just in the course or your curriculum, you may be looking for ways to help your students understand nuclear energy.
I just stumbled across this publication, Nuclear Experiments You Can Do, from the Charles Edison Fund..
Th... | <urn:uuid:c4cb84c7-c861-4daa-be41-e77f7ed18194> | 2.71875 | 146 | Personal Blog | Science & Tech. | 46.351299 |
In the 1950s, the US Air Force was worried about the survival of their pilots if forced to eject at high altitude. Tests with dummies didn’t go so well, so they worked on developing a new parachute design that wasn’t so likely to kill its wearer. But eventually, a human being had to test it. That was Project Excelsior:... | <urn:uuid:a9615d07-315d-4ca1-bec2-35e4ee6d4f79> | 2.96875 | 571 | Personal Blog | Science & Tech. | 63.602215 |
Hair color and static
The hypothesis that hair color will not affect the amount of static electricity produced is proven to be correct.
Natural hair is made from keratin which is the same type of protein that is also found on nails and skin. The static charges in our hair are carried by keratin. The proteins that deter... | <urn:uuid:1037c301-9a6c-4727-aeb5-ca2d56588db2> | 3.15625 | 220 | Tutorial | Science & Tech. | 52.602379 |
Science Fair Project Encyclopedia
Complete algebraic variety
- X × Y → Y
is a closed map, i.e. maps closed sets onto closed sets. (NB Here the cartesian product variety does not carry the product topology, in general; the Zariski topology on it will except in very simple cases have more closed sets.)
The most common ex... | <urn:uuid:de5b1578-62fc-4074-bc66-68d6ce805ea5> | 3.21875 | 232 | Knowledge Article | Science & Tech. | 41.014242 |
Ever Heard of a Butterfly Farm?
Did you know that some butterflies are as big as dinner plates? That they're talented chemists? That the international butterfly trade is a booming business?
Most of the world's butterflies, and certainly its largest and most beautiful ones, are found in tropical rain forests. Habitat de... | <urn:uuid:22eed861-6c04-4063-ab4e-e48fda5b0975> | 3.65625 | 202 | Knowledge Article | Science & Tech. | 42.236571 |
An air bubble of volume 21 cm3 is at the bottom of a lake 40 m deep where the temperature is 3.0°C. The bubble rises to the surface, which is at a temperature of 25°C. Take the temperature of the bubble to be the same as that of the surrounding water. What is the volume of the bubble just as it reaches the surface?
Ans... | <urn:uuid:b03af770-0eff-401e-88e5-e6bbd15874db> | 3.140625 | 82 | Q&A Forum | Science & Tech. | 79.224817 |
Mock-up of the XMM-Newton at the Cité de l'espace, Toulouse
|Launch date||10 December 1999|
|Launched from||Guiana Space Centre, Kourou, French Guiana, South America|
|Launch vehicle||Ariane 5|
|Mission length||13 years, 4 months, and 20 days elapsed|
|Type of orbit||Elliptical|
|Orbit height||7,000 to 114,000 km|
|Orb... | <urn:uuid:aeb07728-366f-42ff-89da-90833f509977> | 2.96875 | 1,055 | Knowledge Article | Science & Tech. | 39.86905 |
Report an inappropriate comment
Thu Jan 08 10:22:22 GMT 2009 by Colin Barras
The fuel cell is similar in some ways to a non-rechargeable battery, but there are important differences. Batteries operate in a sealed environment, whereas fuel cells need to receive oxygen, and release water and/or CO2 depending on the cell ... | <urn:uuid:974e2630-e6f5-4095-b1a3-bd7d151831c9> | 3.78125 | 208 | Comment Section | Science & Tech. | 38.660172 |
Over the last few years, knowledge about the effects of rising heat and CO2 levels in the atmosphere on coral reefs, those bizarre, multicultural underwater gardens, has proliferated. One of the newest reports, published this past March, predicts that if atmospheric carbon levels reach double what they are now – 750 pa... | <urn:uuid:b4f4893c-4d73-42f6-95b6-e8ba9a7f2a17> | 3.578125 | 241 | Truncated | Science & Tech. | 32.240406 |
As Thurston’s article approached its 30th anniversary this year, all but four of the 23 main questions had been settled, including the geometrization conjecture, which the Russian mathematician Grigori Perelman proved in 2002 in one of the signal achievements of modern mathematics. The four unsolved problems, however, ... | <urn:uuid:9d1fe6f9-c61c-4f9c-be94-878581f8de0f> | 2.78125 | 1,068 | Knowledge Article | Science & Tech. | 37.76296 |
In the summer of 2006 Marshall W. Nirenberg chanced on a just published biography of a prominent molecular biologist. It was entitled Francis Crick: Discoverer of the Genetic Code.
“That’s awful!” he thought. “It’s wrong—it’s really and truly wrong!”
Nirenberg himself, along with two other scientists, had received the ... | <urn:uuid:5359d1d2-6647-44bd-bb29-7195b9906057> | 2.90625 | 941 | Nonfiction Writing | Science & Tech. | 45.857469 |
The death of radio astronomer Sir Bernard Lovell
The Lovell Telescope at Jodrell Bank, Cheshire, UK on 12 May 1976. Picture Nick Lomb
Sir Bernard Lovell, the man forever associated with the giant 250 foot (76-metre) radio telescope near Manchester UK, has died on 6 August 2012 at the age of 98. At his death he was Emer... | <urn:uuid:df7ec3b8-73c6-4b2d-befe-59edd1335716> | 2.921875 | 669 | Nonfiction Writing | Science & Tech. | 37.963504 |
Satellites don't take videos; they capture still images. But in a new mosaic, 56 stills have been stitched together to present a seamless video flyover of what LDCM saw one day in April 2013. Read more
A field campaign called the Iowa Flood Studies (IFloodS) is taking place in eastern Iowa from May 1 to June 15, 2013. ... | <urn:uuid:5c9f31f7-755b-4e18-bcfc-7ba0c7164b43> | 2.90625 | 280 | Content Listing | Science & Tech. | 48.645758 |
What happens to the delicate larvae of ocean creatures when they’re exposed to increasing acid levels in the ocean? That’s the question marine biologists Steve Palumbi of Stanford and Eric Sanford of UC Davis are trying to answer through experiments with sea urchin larvae off the California and Oregon coasts.
Their the... | <urn:uuid:e21635b5-85d7-4cb0-8c60-95ada76d685b> | 3.6875 | 198 | Truncated | Science & Tech. | 49.787007 |
Mimer SQL Database Objects
This chapter provides a general introduction to the basic concepts of Mimer SQL databases and Mimer SQL objects.
Mimer SQL is a relational database system. This means that the information in the database is presented to the user in the form of tables. The tables represent a logical descriptio... | <urn:uuid:47ca3bd0-2d99-426f-b514-ba8b1cc0337e> | 3.25 | 480 | Documentation | Software Dev. | 31.500197 |
The waters of the Dead Sea, a landlocked lake between Israel and Jordan, are the saltiest on Earth, inhospitable to all but a few hardy species of bacteria and one species of alga. How do these microbes survive? Researchers in Israel and the United States have now found the secret of at least one of them. Haloarcula ma... | <urn:uuid:94e1e052-aac4-4844-aa29-90f4430c2a76> | 3.90625 | 442 | Knowledge Article | Science & Tech. | 34.036641 |
On this third day of our research project in the Mojave Desert, we did a series of tests on the biological soil crusts and soil samples we collected yesterday at three sites along Kelbaker Road near Baker, CA.
The laboratory building at the Desert Research Station is set up with standard equipment for chemical and biol... | <urn:uuid:20d815a6-e920-48f9-a99a-93b147836454> | 2.984375 | 879 | Personal Blog | Science & Tech. | 46.993131 |
Comprehensive DescriptionRead full entry
BiologyInhabits open waters of lakes and medium to large rivers. Forms large aggregations in backwaters and other still waters during winter. Adults occur in shoals near the surface. Larvae live in littoral zone of rivers and lakes while juveniles leave shores and occupy a pelag... | <urn:uuid:c2dfee77-f255-4d44-9a49-fb82780ecf92> | 3.140625 | 218 | Knowledge Article | Science & Tech. | 47.609019 |
See also the
Dr. Math FAQ:
0.9999 = 1
0 to 0 power
n to 0 power
0! = 1
dividing by 0
Browse High School Number Theory
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good places to begin browsing.
Selected answers to common questions:
Infinite number of primes?
Testing for primality.
What is 'mod'?
- Percentages of ... | <urn:uuid:07ad1d7c-316b-4175-b933-3229a4af6ac7> | 2.71875 | 1,727 | Q&A Forum | Science & Tech. | 87.323337 |
Wonder how the Spanish dancer, or Hexabranchus sanguineus, got its common name? When it swims, the frilled edges of its mantle resemble the color and movement of the skirts of a flamenco dancer.
When they're not swimming, Spanish dancers crawl along relatively flat surfaces with the edges of their mantle tucked up clos... | <urn:uuid:d3ca5afe-b66f-400d-ba60-aa22e2afd09c> | 3.3125 | 1,302 | Personal Blog | Science & Tech. | 56.718232 |
Null Hypothesis Testing with Pearson's r
When to Use
This is straightforward. Do this when you have a sample value of Pearson’s r and you want to test the null hypothesis that the value of r in the population is zero. For example, imagine that each of 50 subjects judges the intelligence level of a stimulus person on a ... | <urn:uuid:37ea1b80-17b4-4caf-b458-d9987c3fe34e> | 4 | 659 | Documentation | Science & Tech. | 72.433404 |
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Backstripping is a proven method for extracting amplitudes of global sea level from passive margin records (e.g., Watts and Steckler, 1979). One-dimensional backstripping is a technique that progressively removes the effects of sedime... | <urn:uuid:3aee58fa-a54c-4bf1-be5d-98922731a658> | 3.078125 | 1,738 | Academic Writing | Science & Tech. | 35.48036 |
This huge cloud of dust and gas is the orion Nebula. Inside it stars are forming. About 4,600 million years ago the sun and the planets were forming inside a nebula like this.
Most of the scientists believe that the sun and the other planets are formed about 4,600 million years ago from a huge cloud of tiny, solid part... | <urn:uuid:ca7f2bb5-174a-4f4e-a1da-68ff9de58603> | 4 | 273 | Knowledge Article | Science & Tech. | 56.611782 |
SAVING THE SAND MOUNTAIN BLUE BUTTERFLY
Sand Mountain blue butterflies live in only one place on Earth — within and near the dunes of “Singing” Sand Mountain in Nevada. But over the past three decades, extensive off-road vehicle use on these public lands managed by the Bureau of Land Management has destroyed more than ... | <urn:uuid:5d3dc9c2-c5f5-4f44-802e-07a862657863> | 3.0625 | 364 | Knowledge Article | Science & Tech. | 33.046944 |
development of CO2 emissions
Whilst Eastern Europe/Eurasia`s emissions of CO2 will increase by 43% between 2009 and 2050 under the Reference scenario, under the Energy [R]evolution scenario they will decrease from 2,483 million tonnes in 2009 to 243 million tonnes in 2050. Annual per capita emissions will drop from 7.3... | <urn:uuid:79a61f80-c10e-4545-9296-cd167b4f0669> | 2.78125 | 171 | Knowledge Article | Science & Tech. | 57.883004 |
Sharks roamed the oceans before dinosaurs walked the land. They even survived the Permian mass extinction 252 million years ago, when over 90% of all species died off. Today, however, these top predators are disappearing from our oceans. They are in trouble on the Great Barrier Reef, have almost been eliminated from th... | <urn:uuid:e3930070-b1a0-4f91-9ae6-0ef04e6a252a> | 3.625 | 758 | Knowledge Article | Science & Tech. | 49.150598 |
February 28, 2007
GCRIO Program Overview
Our extensive collection of documents.
Archives of the
Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 7, NUMBER 3, MARCH 1994
- OF GENERAL INTEREST: OZONE DEPLETION
Protection of the O... | <urn:uuid:cad74500-739c-4b26-9efb-8b7a1b31324c> | 3.0625 | 481 | Content Listing | Science & Tech. | 44.774422 |
Importance of programming languages
As technology evolves, as a driving force in business. In the past, companies were manage by people and processes. These two factors that have led business performance and to determine whether the organization will be successful in achieving important goals. Thus, the need and import... | <urn:uuid:73651ab1-1c53-462f-9cec-d9ed5668f096> | 2.84375 | 361 | Knowledge Article | Software Dev. | 36.004824 |
Vectors - Fundamentals and Operations
Need to see it? Study the 6 + 8 = ??? animation from the Multimedia Physics Studios.Walter Fendt Physics Applets: Resultant of Forces (Addition of Vectors)
Add between two and five vectors together with this interactive Java simulation.
Explore nine lessons from a two-week unit on ... | <urn:uuid:38790c07-e177-47fa-8857-0f677afe020d> | 4.25 | 673 | Tutorial | Science & Tech. | 61.11956 |
|Oct14-04, 04:49 PM||#1|
Rotational energy levels
Are rotational energy levels of a molecule in general equally spaced or does the spacing increase with energy? How about a diatomic molecule; I have seen a derivation showing that the rotational levels in a diatomic molecule are equally spaced, but when drawn in an ener... | <urn:uuid:915f0cab-1fde-4bcf-934a-376116e6ee70> | 2.71875 | 573 | Comment Section | Science & Tech. | 45.271061 |
This is an issue that is often misunderstood in the public sphere and media, so it is worth spending some time to explain it and clarify it. At least three careful ice core studies have shown that CO2 starts to rise about 800 years (600-1000 years) after Antarctic temperature during glacial terminations. These terminat... | <urn:uuid:28efacbf-3847-488e-947e-46cb72f8526b> | 3.65625 | 653 | Knowledge Article | Science & Tech. | 61.451226 |
In this tutorial, we will see how to create a short array with the help of short buffer.
The java.nio.ShortBuffer class extends java.nio.Buffer class. It provides the following methods:
|static ShortBuffer||allocate( int capacity)||The allocate(..) method allocate a short buffer of given capacity.|
|short||array()||The... | <urn:uuid:29117fa5-11be-4cce-bc6c-50fb5a6459a6> | 2.75 | 188 | Documentation | Software Dev. | 57.494615 |
Hello, Frank Indiviglio here. Genetic research has revealed that a fairly well-studied frog has been hiding an astonishing secret – pairs form lifelong pair bonds and remain faithful to one another. Equally surprising is the fact that pool size alone (and not morality!) seems responsible for the fidelity shown by Mimic... | <urn:uuid:aca2f117-bbee-4224-b2c3-c5dafaf79600> | 3.28125 | 564 | Personal Blog | Science & Tech. | 28.644912 |
A macro replaces the original text in the code before the compiler start to process the file. I.e. every single place where you use the macro will get a duplicate of the code.
A function is a complete section of code i.e. no duplication occur.
Consider macros to be evil and stick to using functions instead, at least un... | <urn:uuid:b16f546e-1ff8-4914-a5a4-16a8b8c0bde9> | 3.296875 | 445 | Comment Section | Software Dev. | 61.40352 |
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Many images of the solar system do not do justice to how small the planets are relative to the Sun, or how distant they are from the Sun and each other. The solar system is really mostly empty space. The Toilet Roll Solar System activity helps give an idea of the relative distances between the plan... | <urn:uuid:34c1061a-aeab-4f8c-bb27-f33c51722326> | 2.875 | 83 | Truncated | Science & Tech. | 49.725068 |
Vent Communities Under the Galapagos Islands
Vent communities are animals and plants that are found deep in the ocean near hot water or geothermal vents. Vents are found where the tectonic plates crack. Molten lava lies deep within the cracks and heats up the water. This ecosystem is teeming with life. They are rich in... | <urn:uuid:30046acd-23e8-4dc9-9e9e-29081e35b098> | 3.671875 | 171 | Knowledge Article | Science & Tech. | 54.501374 |
Towards the end of every year tropical storm activity moves from the northern hemisphere to the southern hemisphere. The South Indian Ocean has already spawned three tropical storms including the unusually strong early season Cyclone Anais in October. Attention has now switched to the South Pacific Ocean and Cyclone Ev... | <urn:uuid:0ca18714-2557-45f4-bcd5-1ceca5844f67> | 3.125 | 345 | Knowledge Article | Science & Tech. | 39.128947 |
Tag: "microbes" at biology news
Newly Discovered Bacteria Produce Magnetic Material
... "In 1994," Phelps says, "we determined that these microbes
from theTaylorsville Triassic Rift Basin near Fred...ionth of a meter. "We also found evidence that the microbes
can remediate groundwatercontaining chlorocarbon compounds, ... | <urn:uuid:0887eb30-b3d9-4456-bdb8-ec0c6e420fb0> | 2.859375 | 1,558 | Content Listing | Science & Tech. | 34.958807 |
unassimilatible writes "The Harvard-Smithsonian Center for Astrophysics reports 'to impress your favorite lady this Valentine's Day, get her the galaxy's largest diamond.' A newly discovered cosmic diamond is a chunk of crystallized carbon 50 light-years from the Earth in the constellation Centaurus. It is 2,500 miles ... | <urn:uuid:c85c2700-6e4e-4b05-917b-2b1db99838be> | 3.1875 | 112 | Comment Section | Science & Tech. | 40.921 |
Once oil has entered the Gulf Stream, it may stay offshore in the Gulf Stream. There is some chance that it could move toward nearshore coastal waters and even reaching the coastlines of South Atlantic states. The amount of oil — if any — that reaches shore depends on several factors, including:
- the amount of oil in ... | <urn:uuid:d5a43cf0-e630-4c37-83f4-4fdb026ba079> | 3.609375 | 367 | Knowledge Article | Science & Tech. | 41.386749 |
Although the highly invasive water hyacinth was introduced into Florida over 30 years ago, the aquatic plant hasn’t been nearly as successful as it has been in other places such as Lake Victoria, South Africa. Despite this, Florida’s weather and conditions are optimal for sufficient growth of water hyacinth. The warm c... | <urn:uuid:286c4586-712d-4978-ac2a-a17e99544c1e> | 3.546875 | 594 | Academic Writing | Science & Tech. | 32.138458 |
The CGI (Common Gateway Interface) defines a way for a web server to
interact with external content-generating programs, which are often
referred to as CGI programs or CGI scripts.
Within Tomcat, CGI support can be added when you are using Tomcat as your
HTTP server and require CGI support. Typically this is done
durin... | <urn:uuid:91f15aa7-7164-4e02-a672-0a55cb422ca4> | 3.09375 | 156 | Documentation | Software Dev. | 52.904655 |
This post is from Dr John Bissell, a physicist researching tipping points in mathematical systems for the project.
In a conference that had largely focused on `tipping points’ in human society, especially those involving the spread of `buzzwords’, `innovation’ and `trends’, Prof Richard Law‘s talk on ecological dynamic... | <urn:uuid:e4bc7cec-7b94-468b-9df3-f54037e70154> | 2.78125 | 518 | Academic Writing | Science & Tech. | 20.614824 |
Authors: Amrit S. Sorli
Penrose describes consciousness as a result of quantum gravity acting on the neurons of the brain. Consciousness is non local; it does not exist exclusively in the brain. Here it is introduced idea that consciousness is a basic frequency of quantum space. Human brains have ability to "connect" a... | <urn:uuid:2795051b-f03b-40c8-af60-0f56ed597685> | 2.859375 | 112 | Truncated | Science & Tech. | 47.596429 |
Higgs bosonArticle Free Pass
Higgs boson, also called Higgs particle, hypothetical particle that is postulated to be the carrier particle, or boson, of the Higgs field, a theoretical field that permeates space and endows all elementary subatomic particles with mass through its interactions with them. The field and the ... | <urn:uuid:04e23da0-bef7-4d40-969e-273afae8c3a8> | 3.765625 | 605 | Knowledge Article | Science & Tech. | 34.59825 |
How do macrophyte distribution patterns affect hydraulic resistances?
In eutrophic river systems, macrophytes attain high biomass with reduced drainage and increased flooding risk. To avoid these problems, water managers remove vegetation. Total removal, however, increases wash out of macro-invertebrate communities red... | <urn:uuid:cc282816-aad2-4002-bc37-07c80cc060eb> | 2.84375 | 316 | Academic Writing | Science & Tech. | 29.762071 |
Simple information searches -- name lookups, word searches, etc. -- are often implemented in terms of an exact match criterion. However, given both the diversity of homophonic (pronounced the same) words and names, as well as the propensity for humans to misspell surnames, this simplistic criterion often yields less th... | <urn:uuid:878a76ff-9056-4c2e-ad0c-f0ba2d84ccce> | 3.15625 | 1,491 | Documentation | Software Dev. | 29.884647 |
How Much Potential Energy Do Different Nuts Have?
It seems that at least once a year California has another energy crisis, and almost as often, someone wonders what will happen when California runs out of energy sources. Christopher Crews, knowing that all living things contain energy, set out to prove that different v... | <urn:uuid:70991200-cc00-4786-b3cc-22df4b25f76e> | 3.46875 | 469 | Tutorial | Science & Tech. | 46.829936 |
Some operations are difficult or even impossible to obtain with an expression, or the operation could become too complex to achieve. The alternative is to create a function that would take care of performing the operation and supplying the result to the table. Of course, as you may know already, a function is its own o... | <urn:uuid:c0647975-81bf-4915-9484-30a474c1ec66> | 2.75 | 811 | Tutorial | Software Dev. | 42.359164 |
The module Storable provides most elementary support for marshalling and is part of the language-independent portion of the Foreign Function Interface (FFI) - see also Section 4.13. It provides a class Storable and instances of this class for all primitive types that can be stored in raw memory. The member functions of... | <urn:uuid:30ab7895-4b57-4e50-9fba-60eb63276c2b> | 2.71875 | 925 | Documentation | Software Dev. | 42.353662 |
Lava, not water, may have carved the biggest channels on Mars.
Ever since NASA's Mariner 9 spacecraft beamed back the first images of the channels in the 1970s, most people have assumed they were created by massive floods. But David Leverington of Texas Tech University in Lubbock says flowing water would have left behi... | <urn:uuid:3f607ba1-e14d-4a3e-8d9b-55af8ff3041c> | 3.921875 | 560 | Truncated | Science & Tech. | 54.708963 |
Size of 23s and 16s RNA different - (Apr/24/2006 )
I did DNA extraction from B. subtilis sample, but did not use any RNase to remove RNA in my sample. Two distinct bands appear at size 1.2kb and 1.7kb. I am suspecting they are 16s and 23s rRNA. However, I found out the size of 23 and 16s respectively are 2.9kb and 1.5k... | <urn:uuid:2f82beef-5928-42e0-92ec-f90a05ece7ec> | 2.84375 | 292 | Comment Section | Science & Tech. | 75.21229 |
This is a printer version of an UnderwaterTimes.com
To view the article online, visit: http://www.underwatertimes.com/news.php?article_id=86510072139
This graphic shows how the movements of the fish along the lake bed left the trails. Credit: Anthony Martin
ATLANTA, Georgia -- The wavy lines and squiggles etched into a... | <urn:uuid:af575c11-9d51-4ea7-ab89-3bbc69247eeb> | 3.40625 | 842 | Truncated | Science & Tech. | 44.375777 |