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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The namespace contains channels that use the TCP protocol to transport messages and objects to and from remote locations. By default, the TCP channels encode objects and method calls in binary format for transmission, but other encoding and decoding formatter sinks can be specified in the configuration properties of a ... | <urn:uuid:724c0ca8-2e85-407d-ae58-0cd9a0e3e28f> | 2.90625 | 144 | Documentation | Software Dev. | 35.494916 |
Have you got the Mach knack? Discover the mathematics behind
exceeding the sound barrier.
This article explores ths history of theories about the shape of our planet. It is the first in a series of articles looking at the significance of geometric shapes in the history of astronomy.
How efficiently can various flat sha... | <urn:uuid:2794dfdc-b71d-4527-8b81-df9833041d1d> | 3.84375 | 1,454 | Content Listing | Science & Tech. | 65.935541 |
I have been racking my brains over the differences between laser spectral width and something called the linewidth. The linewidth was written about in detail by Henry in 1982. The spectral width is the width at -20dB down from peak of the wavelength spectrum of the laser. I am looking at some laser data right now that ... | <urn:uuid:836229a4-cd08-4483-917f-574b48f12b5f> | 2.90625 | 527 | Q&A Forum | Science & Tech. | 50.93625 |
Science on a sphere
By Margaret Harris in Washington, DC
No trip to the AAAS meeting would be complete without a tour of the exhibit hall, which for the past two days has been buzzing with visitors to “Family Science Days”, a public outreach-oriented event running in parallel with the more technical seminars.
One of th... | <urn:uuid:7745d617-d554-4f4f-ad17-b2f2a6c360ac> | 2.8125 | 454 | Personal Blog | Science & Tech. | 39.732077 |
By Brianne, Coastal Studies for Girls
Last Friday, Dr. David Fields, Senior Scientist at Bigelow Laboratory for Ocean Science, gave the students of Coastal Studies for Girls a tour around the buildings. One of the highlights of the trip was their vast algal collection. All seventeen of us piled into the little refriger... | <urn:uuid:79006fc9-6f80-400d-90f7-f3166963dd10> | 2.734375 | 743 | Personal Blog | Science & Tech. | 47.849838 |
public interface KeyHolder
Implementations of this interface can hold any number of keys. In the general case, the keys are returned as a List containing one Map for each row of keys.
Most applications only use on key per row and process only one row at a
time in an insert statement. In these cases, just call
to retrie... | <urn:uuid:af54ca2d-0b1e-4cf4-94a4-d0e9dbbf45c1> | 2.75 | 291 | Documentation | Software Dev. | 34.021902 |
Physics Tip Sheet #55 - October 12, 2005
Contact: James Riordon
American Physical Society
Highlights in this issue: the first ever molecules of light, virtual learning trumps reality in lab class, and focusing ocean waves for fun and power.
Molecules of light
M. Stratmann, T. Pagel, and F. Mitschke
Physical Review Lett... | <urn:uuid:9ae5cf67-4ff4-4302-bda4-44b951d5daa6> | 3.5625 | 852 | Content Listing | Science & Tech. | 28.690885 |
The Atlantic Meridional Overturning Circulation or AMOC is a current that carries warm water north, where it cools, falls to the bottom and returns south. As you can see here, it is part of a larger worldwide current system, often called the thermohaline circulation:
A failure of the AMOC is believed to have caused the... | <urn:uuid:ff95fdb1-43bb-4f0b-b4c2-a3350519e9d5> | 3.703125 | 498 | Knowledge Article | Science & Tech. | 20.317772 |
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.
...strains, the daughter buds have a flagellum and are motile, whereas the mother cells lack flagella but have long pili and holdfast appendages a... | <urn:uuid:d829a882-ab4f-40b4-a24d-4e1467a585ec> | 2.796875 | 158 | Knowledge Article | Science & Tech. | 58.005 |
U.S. Physicists Crack Mystery of "Mini-LHC" With a Little Help From Einstein
March 23, 2011 9:30 AM
comment(s) - last by
Electrons "ride the wave" of BELLA's laser pulse (white point), accelerating (blue) to near the speed of light (orange/red is pocket of deceleration.
(Source: Lawrence Berkeley National Laboratory)
I... | <urn:uuid:7adcb451-c9f5-4f12-aab7-8c1f9f1e7461> | 2.921875 | 2,307 | Comment Section | Science & Tech. | 45.617749 |
Thionin - The Two - Faced Reaction
Concept: Photochemical reaction, Oxidation/reduction, and Reversable chemical reaction
Preparation: Prepare 0.001 M thionin solution by adding 100 mL distilled water to 0.023g of thionin. Stir to dissolve. The thionin has a poor shelf life; use within one week.
Introduction: So far we... | <urn:uuid:7ef99278-4413-4631-a50c-5ebabb7f3bd2> | 3.5 | 512 | Tutorial | Science & Tech. | 58.562864 |
contact action noun acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; `of the top 50 commodity chemicals, 30 are created ...
Found op http://wordnetweb.princeton.edu/perl/webwn?s=catalysis
(kә-tal´ә-sis) increase in the velocity of a chemical r... | <urn:uuid:8e3fe608-729a-402a-a9ae-4ea27463207d> | 3.21875 | 832 | Structured Data | Science & Tech. | 63.041129 |
As of today, the Wikipedia entry for the hummingbird explains that the bird's flight generates in its wake a single trail of vortices that helps the bird hover.
But after conducting experiments with hummingbirds in the lab, researchers at the University of California, Riverside propose that the hovering hummingbird ins... | <urn:uuid:f26dc9a1-996b-4072-929a-be4df54379ff> | 4.5625 | 1,671 | Knowledge Article | Science & Tech. | 42.255779 |
|Kinesin dimer / David S. Goodsell, Scripps Research Institute|
One way to transport objects inside a cell is by the use of Kinesin motor proteins. Three things are required: a motor to move the cargo, a track along which to move it, and the cargo itself that needs to be delivered.
Proteins are essential components of ... | <urn:uuid:0519000b-87b5-4c72-b0bb-dfac915195d0> | 3.890625 | 541 | Knowledge Article | Science & Tech. | 36.799164 |
Read more: "Special report: After Japan's megaquake"
Six days after the earthquake that rocked Japan and left thousands dead, the nation is now struggling to avert disaster at its Fukushima Daiichi nuclear power plant. Events have moved fast and risks are hard to assess.
The worst nuclear accident in history was the Ch... | <urn:uuid:5051d0aa-543b-48ca-8dfd-761559793754> | 3.328125 | 1,531 | Comment Section | Science & Tech. | 49.052572 |
Watch the video to find out what lichens can tell you about pollution levels in your local environment.
You can find out a lot about air quality in your area by studying lichens on local trees, as different lichens thrive in different conditions.
The golden shield lichen, Xanthoria parietina, for example, can live in a... | <urn:uuid:f68f33f5-890f-48db-8ce4-0570e2cf7a34> | 3.6875 | 224 | Knowledge Article | Science & Tech. | 47.508142 |
Reducing a Map Path Using Douglas-Peucker Algorithm
The Douglas-Peucker Algorithm
The Douglas-Peucker algorithm is used to reduce the number of points in a line. It does so by discarding points that do not deviate significantly between its surrounding points.
The amount a point may deviate before it is excluded is an i... | <urn:uuid:d96762bb-024d-488b-adc4-87c66b7be655> | 3.671875 | 246 | Tutorial | Software Dev. | 55.904914 |
Among the many studies that have investigated the effects of urbanization on wildlife, few, if any, have focused on a species primarily valued as an economic commodity. This knowledge gap was recently addressed by researchers from the University of Illinois who studied the effects of anthropogenic landscape alterations... | <urn:uuid:1bf979d1-cba4-42eb-8a6c-9898e97bee4d> | 3.703125 | 1,267 | Knowledge Article | Science & Tech. | 26.678466 |
The unusually high mortality reported among endangered sea turtles in the wake of the oil spill in the Gulf of Mexico raises legitimate fears for the future of these ocean-dependent creatures. An initial survey carried out 10 days after the Deepwater Horizon well blowout found 156 dead turtles, most of them Kemp's Ridl... | <urn:uuid:94da94f0-510d-4633-861b-16981769a4e2> | 3.375 | 506 | Nonfiction Writing | Science & Tech. | 31.095863 |
The 2010 hurricane forecast calls for an above average year for hurricanes and tropical storms. El Nino has weakened which means less wind shear in the tropics. Also, ocean temperatures are running 4 degrees warmer than average. Warm water is critical for storm development.
The oil spill in the gulf is small compared t... | <urn:uuid:884260cd-fbf5-44aa-9313-0daad5404896> | 2.703125 | 204 | Truncated | Science & Tech. | 49.042701 |
The staurolite structure consists of oxygen atoms in an approximately cubic close packing. However, the cation arrangement does do not have cubic symmetry. The structure consists of dioctahedral sheets joined by isolated octahedra. Silica tetrahedra fill the gaps between octahedra. A polyhedral model is below.
Below is... | <urn:uuid:aa815830-e3db-40ea-b845-4ce8d13324f7> | 2.734375 | 119 | Knowledge Article | Science & Tech. | 29.677108 |
During the last 5 years, a set of methodologies have become popular, called agile methodologies . An agile methodology is, in general, one that emphasizes incremental development and small design steps guided by frequent interactions with customers. The customer and developers get together and agree on the next set of ... | <urn:uuid:7cb2f8cd-ff8e-42c9-833b-26a695d561de> | 2.9375 | 1,830 | Knowledge Article | Software Dev. | 24.801984 |
Trigonometry/Circles and Triangles/Philo's Line
From Wikibooks, open books for an open world
Suppose any angle POQ and a point X between the lines OP and OQ. Philo's line is the shortest line AB through X such that A is on OP (or OP produced) and B is on OQ (or OQ produced).
If Y is the foot of the perpendicular from O... | <urn:uuid:03f50e77-e985-4d2a-bd79-55fdb565d7f5> | 3.40625 | 101 | Knowledge Article | Science & Tech. | 69.61615 |
How can you cut a doughnut into 8 equal pieces with only three cuts
of a knife?
The large rectangle is divided into a series of smaller
quadrilaterals and triangles. Can you untangle what fractional part
is represented by each of the ten numbered shapes?
Annie cut this numbered cake into 3 pieces with 3 cuts so that th... | <urn:uuid:19e5abf6-8c77-4308-9250-513847b33bf0> | 3.046875 | 167 | Q&A Forum | Science & Tech. | 58.097067 |
The volume of the leftover material is equal to the volume of a 6" sphere.
First, let's look at the 2 dimensional equivalent of this problem. Two concentric circles where the chord of the outer circle that is tangent to the inner circle has length D. What is the annular area between the circles?
big circle radius is R ... | <urn:uuid:acda2335-66ef-4136-b45a-f9499ea9e242> | 3.59375 | 329 | Tutorial | Science & Tech. | 69.497461 |
Like a digital video puppet, the facial expressions of one person can be cloned in real time and mapped onto the digital face of another person. Barry-John Theobald, computer scientist at the University of East Anglia, explains the technique and Steven Boker, of the University of Virginia, explains what facial cloning ... | <urn:uuid:4b78a9c3-9dc8-4a3c-afce-0f8873cc69be> | 2.71875 | 113 | Truncated | Science & Tech. | 29.855 |
Pfitzer 1871 Category: Symmetrical biraphid
TYPE SPECIES: Plagiotropis baltica Pfitzer
The valve margins of Plagiotropis are lanceolate with narrow poles. The valve face is folded, with folds appearing as lines on either side of the raphe. The raphe itself is raised above the valve face and positioned within a keel. Th... | <urn:uuid:959d3856-fc7b-4642-a833-f168e9859652> | 3.03125 | 216 | Structured Data | Science & Tech. | 41.804139 |
It was the Russian scientist Konstantin Tsiolkovsky who first proposed the idea of a space elevator — an incredibly strong cable stretching from the surface of the Earth to a point 100,000 kilometers in space. Along this track elevator cars would move, powered by electricity and whisking people and cargo into space at ... | <urn:uuid:3cbec590-6cc0-47a5-97b0-cb7769b6cdd9> | 3.375 | 765 | Personal Blog | Science & Tech. | 39.701765 |
Looking for Cramster? Cramster is now Chegg Homework Help. Learn More
The electrons in the beam of a television tube have a kineticenergy
of 2.80 10-15 J. Initially, the electrons
movehorizontally from west to east. The vertical component of
theearth's magnetic field points down, toward the surface of
theearth, and has... | <urn:uuid:04c70f58-b163-4786-8f9b-6a77acd41899> | 3.109375 | 144 | Q&A Forum | Science & Tech. | 56.797063 |
Poplar wood rays are involved in seasonal remodeling of tree physiology
Understanding seasonality and longevity is a major challenge in tree biology. In woody species growth phases and dormancy follow one another consecutively. In the oldest living creatures the annual cycle may run for more than a thousand years. So f... | <urn:uuid:8c496d82-9d2f-48d5-9080-ea4cd7ad0f26> | 2.8125 | 282 | Academic Writing | Science & Tech. | 21.906149 |
Atomic Weight and Number
The atomic number of an atom is simply the number of protons in its nucleus. The atomic weight of an atom is given in most cases by the mass number of the atom, equal to the total number of protons and neutrons combined. An atom may be conveniently symbolized by its chemical symbol with the ato... | <urn:uuid:b6a3a5d7-12c3-4409-86b4-fbc325bee90b> | 4.09375 | 161 | Knowledge Article | Science & Tech. | 34.802802 |
With the UK’s current drought expected to last until Christmas, we look at one possible way to bring the rain.
Suppliers are introducing hosepipe bans and urging customers to use less water.
But instead of using less, is there a way of producing more?
Experiments in cloud seeding suggest that it may be possible to arti... | <urn:uuid:330befc3-7bfc-4dc8-a783-735cabca00db> | 3.703125 | 407 | Knowledge Article | Science & Tech. | 52.756961 |
Meitnerium is an artificially produced radioactive element. None of meitnerium's chemistry has been researched, but it should resemble other elements of group 9, like iridium.
Meitnerium does not have any known application and little is known about it.
Meitnerium in the environment
Meitnerium is not found free in the e... | <urn:uuid:35034fd2-523a-4220-a51e-adf42de5175a> | 3.484375 | 158 | Knowledge Article | Science & Tech. | 43.512284 |
|Register||Search||Today's Posts||Mark Forums Read|
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Spintronics goes organic...
[Only registered users see links. ]
Spintronics goes organic
25 February 2004
Physicists hav... | <urn:uuid:b905c3d5-4239-4ca5-b063-1193f5f2d3e6> | 2.6875 | 772 | Comment Section | Science & Tech. | 44.637039 |
On some winter days, large swarms of water striders emerge from wherever they hide on cold days and go racing across the surface of Geronimo Creek.
The ones in the nearby photo were waltzing across the water when its temperature was 55.8 degrees. The air was 65.3 degrees.
While they are most commonly known as water str... | <urn:uuid:21aa8e3f-4118-4498-b308-ea0421a7feb8> | 3.359375 | 596 | Nonfiction Writing | Science & Tech. | 60.543136 |
Four years ago, Romanian explorer Stefan Milota made an amazing discovery in previously unknown caves deep within his country's Carpathian mountains: a jawbone that turned out to be the oldest modern human fossil found in Europe. More surprisingly, this mandible showed features that suggested early modern humans might ... | <urn:uuid:6b1bc5fb-8e74-40aa-9c32-78c56bdcfac1> | 3.328125 | 225 | Truncated | Science & Tech. | 51.943273 |
0.13 °C. The amount the atmosphere is warming each decade
1.3 times as much CO2 is entering the atmosphere compared with just 20 years ago
3 kilometres. The depth to which the oceans have warmed
3.1 centimetres. The rise in sea level each decade
90 per cent certainty that we are to blame
The word they were most pleased... | <urn:uuid:d44ef24c-22da-49b9-bf5f-56ceabb6b325> | 2.953125 | 214 | Truncated | Science & Tech. | 52.502929 |
OUR addiction to fossil fuels shows no sign of waning. An International Energy Agency report predicts that global coal use will continue to grow over the next five years.
Demand for coal will increase everywhere except the US, where cheap gas extracted by hydraulic fracturing or fracking will exceed it. By 2017, coal u... | <urn:uuid:aa212f9e-b2ca-4a85-b71a-15200b93788a> | 3.546875 | 522 | Truncated | Science & Tech. | 50.087934 |
Name: Omar G.
Why do the electrons in a charged body (take the metal for example)
that has an edged (I mean a special shape like ...
|____/ or similar to this |___> )
goes around (mostly) the edge of that shape (which is in the left side of
the figure drawn).
Electrons in a negatively charged body go near the edges bec... | <urn:uuid:5c103da4-1eb4-45f9-95aa-71c4cd2eda69> | 4.4375 | 189 | Q&A Forum | Science & Tech. | 64.514804 |
Name: Duncan B. Smith
Why do planets closer to the Sun travel faster than the outer planets?
The speed with which planets move around the Sun is proportional to the
force of Sun at the planet's position. The force falls off with distance as
inverse square so the planets closer to the Sun experience a larger force
and h... | <urn:uuid:30aefb8b-96d3-47cd-b500-2633c54d8b95> | 3.234375 | 92 | Q&A Forum | Science & Tech. | 52.170231 |
Mechanics: Newton's Laws of Motion
Newton's Laws of Motion: Audio Guided Solution
Dexter Eius is running through the cafeteria when he slips on some mashed potatoes and falls to the floor. (Let that be a lesson for Dexter.) Dexter lands in a puddle of milk and skids to a stop with an acceleration of -4.8 m/s/s. Dexter ... | <urn:uuid:fecc76f1-ead8-4a8a-b95f-e60c66398d61> | 3.640625 | 298 | Tutorial | Science & Tech. | 62.919545 |
Mammals in Ireland
By biologist Terry Flanagan, B.Sc., M.I.Biol.I., H.Dip. Ed.
Here is the table of contents, you can click on the links below to take you directly to read about the particular mammals or just read on...
Introduction to the Mammals in Ireland
Mammals of the air
What are mammals?
Mammals are the most hig... | <urn:uuid:8a41f123-9fdc-44f2-92d5-190bec108d15> | 3.5625 | 1,204 | Knowledge Article | Science & Tech. | 58.242777 |
Web edition: December 31, 2009
Print edition: January 16, 2010; Vol.177 #2 (p. 31)
The fascinating article “Aping the Stone Age” (SN: 11/21/09, p. 24) led me to wonder whether researchers who work with chimps or other higher apes have ever introduced them to the modern tools used by humans, such as saws, axes, hammers ... | <urn:uuid:024ba599-7e63-4f0f-8741-e17e415c702e> | 2.984375 | 595 | Comment Section | Science & Tech. | 59.213578 |
In 1999, a bold plan was laid out to establish a broad collaboration among biologists, oceanographers, engineers and computer scientists in the emerging field of “biologging” science. At a workshop held at Stanford University’s Hopkins Marine Station in Pacific Grove, California, more than 50 people gathered and develo... | <urn:uuid:4132ef88-f979-47c0-80d9-b357b6754d01> | 3.40625 | 709 | Content Listing | Science & Tech. | 46.573343 |
When known to the interpreter, the script name and additional arguments thereafter are passed to the script in the variable sys.argv, which is a list of strings. Its length is at least one; when no script and no arguments are given, sys.argv is an empty string. When the script name is given as '-' (meaning standard inp... | <urn:uuid:8b3c0d29-a341-452f-964b-a8ec034b9102> | 2.90625 | 129 | Documentation | Software Dev. | 78.859227 |
Show: Delphi C++
Generating a New Event Handler
From RAD Studio XE2
You can generate skeleton event handlers for forms and other components.
To create an event handler
- Select a component.
- Click the Events tab in the Object Inspector. The Events page of the Object Inspector displays all events defined for the compon... | <urn:uuid:5ce5043e-c7c9-4da2-933e-d263978ded7f> | 2.96875 | 127 | Tutorial | Software Dev. | 54.095773 |
Regular singular point
In mathematics, in the theory of ordinary differential equations in the complex plane , the points of are classified into ordinary points, at which the equation's coefficients are analytic functions, and singular points, at which some coefficient has a singularity. Then amongst singular points, a... | <urn:uuid:e64b30df-296f-4dc9-89c3-0a300f837a51> | 2.9375 | 1,379 | Knowledge Article | Science & Tech. | 48.58366 |
Tuesday, August 31, 2010
It's quite sobering to be reminded that our picture of how all this crusty stuff operates, how the great plates of rock shift and slide around, is still very, very new. Fifty years ago and the idea of plate tectonics was only just taking proper shape. Fast forward and we now talk about the inev... | <urn:uuid:2b951261-354d-42da-bf53-0c4463d0a967> | 3.453125 | 554 | Personal Blog | Science & Tech. | 39.527249 |
Python Fundamentals Tutorial : Regular Expressions
At the simplest level, there are module-level functions in
re that can be used to search for regular expresssions. In many cases, calling the
search() function and checking for the presence of a return value is enough.
None if the pattern was not found.
It is customary... | <urn:uuid:7204502b-25c2-4f2c-9ea5-84f0e7d27bbb> | 3.8125 | 577 | Tutorial | Software Dev. | 69.907447 |
This problem is about investigating whether it is possible to start at one vertex of a platonic solid and visit every other vertex once only returning to the vertex you started at.
You have 27 small cubes, 3 each of nine colours. Use the small
cubes to make a 3 by 3 by 3 cube so that each face of the bigger
cube contai... | <urn:uuid:84053f2c-64b4-435b-a4a4-1cd60e8aa994> | 3.265625 | 1,703 | Content Listing | Science & Tech. | 68.236869 |
Which of these is the current (also, what about voltage?) induced by an EMP pulse within a circuit most dependent on?
- The area of the region enclosed by the circuit
- The orientation of that area with respect to the originating direction of the pulse
- The total length of the circuit (e.g. a wire with two conductors ... | <urn:uuid:a4478418-38fd-4a9b-a6a2-78cae5e19f67> | 2.703125 | 187 | Q&A Forum | Science & Tech. | 50.250775 |
Matt Strassler [December 13, 2012]
Every atom is a representative of one of about 100 chemical elements, and every chemical element is labelled by a name and an atomic number Z. (To review the basics about atoms, click here.) The atomic number tells you how many protons are in that atom’s nucleus, and also, if the atom... | <urn:uuid:e7ae3e46-d76c-4073-ab12-de943a7c2068> | 4.3125 | 475 | Personal Blog | Science & Tech. | 47.867327 |
Every browser that supports XHTML (Firefox, Opera, Safari, IE9) supports self-closing syntax on every element.
<br></br> all should work just fine. If they don't, then you have HTML with inappropriately added XHTML DOCTYPE.
DOCTYPE does not change how document is interpreted. Only MIME type does.
W3C decision about ign... | <urn:uuid:187a2bf7-16f6-4dab-a504-53731a7331cd> | 2.984375 | 441 | Q&A Forum | Software Dev. | 77.41187 |
The world's first coral
reefs occurred about 500 million years ago, and the first close
relatives of modern corals developed in southern Europe about 230
million years ago. By comparison, the Great Barrier Reef is relatively
young at just 500,000 years old. The current reef's structure is much
younger at less than arou... | <urn:uuid:74da18eb-5207-4c13-ae95-88e300ac7e8b> | 4.21875 | 1,348 | Knowledge Article | Science & Tech. | 48.718078 |
h and Chi Persei
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.
...clusters and can be accounted for in detail by calculations of the rate of evolution of stars of different absolute magnitudes... | <urn:uuid:1fdff147-cde4-4a53-8bf4-2b26d80caf60> | 3.203125 | 235 | Truncated | Science & Tech. | 65.595 |
||Because of the important role radiation plays in the climate system, the Baseline Surface Radiation Network (BSRN) was established to provide a worldwide network to continuously measure radiative fluxes at the Earth's surface. Over 30 stations located throughtout the world are planned for BSRN. Many of these stations... | <urn:uuid:a9e6d2be-6f25-4135-b3ee-d21beffa93d4> | 4 | 163 | Knowledge Article | Science & Tech. | 26.477581 |
Wednesday Science Night takes a look at different species of deadly animals such as the venomous Black Mamba, and crop crippling rats that are found in various geographic locations around the world today.
Nature Black Mamba 7 pm
The black mamba is one of Africa’s most dangerous and feared snakes, known for being very a... | <urn:uuid:a8c9de98-fb5f-4910-8152-f6653cf5b1df> | 3.484375 | 499 | Content Listing | Science & Tech. | 41.391551 |
View your list of saved words. (You can log in using Facebook.)
In mathematics, the useful concept of a process with no end. As represented by the symbol , it is often mistakenly thought to be the largest number or a place on the real number line. Instead, it is the idea of a limit, as in the expression x , which sugge... | <urn:uuid:67fe80d4-a286-47cf-8306-50d675b8cb19> | 3.421875 | 168 | Knowledge Article | Science & Tech. | 56.863851 |
ONCE a century, a burst of super-energetic cosmic rays will strike the Earth within a kilometre of where you are standing. And, if that's not worrying enough, astrophysicists have no idea where these rays come from.
Last week, at a meeting in Chicago, physicists from 22 countries announced plans to build an array of co... | <urn:uuid:83a47dad-9dd4-4cd7-8559-7692378265ac> | 3.859375 | 220 | Truncated | Science & Tech. | 45.220388 |
Imagine floating 35,000 miles above the sunny side of Earth. Our home planet gleams below, a majestic whorl of colour and texture. All seems calm around you. With no satellites or space debris to dodge, you can just relax and enjoy the black emptiness of space.
But looks can be deceiving.
In reality, you've unknowingly... | <urn:uuid:a6aa38aa-c075-421b-adcd-03016d47f3f6> | 3.578125 | 1,412 | Knowledge Article | Science & Tech. | 44.154614 |
This curled-up critter is one of seven new species of limbless amphibians found recently in the soil of northeastern India. It took researchers more than 1,000 hours of digging to discover all seven in 58 locations throughout the region.
This is not the first species this team has discovered. Sathyabhama Das Biju of th... | <urn:uuid:207baf79-c511-4ac0-abf8-8826236806a6> | 3.015625 | 122 | Knowledge Article | Science & Tech. | 56.229082 |
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A distant super-Earth named "55 Cancri e" is wetter and weirder than astronomers thought possible. The discovery has researchers re-thinking the nature of alien worlds.
FULL STORY at http://science.nasa.gov/science-news/science-at-nasa/2012/13... | <urn:uuid:245f7c3f-3daf-45d9-8b73-d927fb40f383> | 2.75 | 205 | Comment Section | Science & Tech. | 63.486176 |
But, my description was merely a proof of concept, not how to make use of the idea. That could happen at a much higher level than the Planck size world. This theory actually plays into another theory I have about mitigating apparent mass using magnetic fields. The problem is generating a magnetic field big enough witho... | <urn:uuid:a932a275-2b49-456f-8aed-266ec1a3f16a> | 2.859375 | 448 | Comment Section | Science & Tech. | 63.001628 |
As in principal components analysis, the results of correspondence analysis
are presented on graphs that represent the configurations of points in
projection planes, formed by the first principal axes taken two at a time. It
is customary to summarize the row and column coordinates in a single plot.
However, it is impor... | <urn:uuid:d0e01a44-ad73-4e45-a733-e20554abb978> | 2.984375 | 550 | Academic Writing | Science & Tech. | 27.126575 |
Note: GFF parsing is not yet integrated into Biopython. This documentation is work towards making it ready for inclusion. You can retrieve the current version of the GFF parser from: http://github.com/chapmanb/bcbb/tree/master/gff. Comments are very welcome.
Generic Feature Format (GFF) is a biological sequence file fo... | <urn:uuid:7afa985d-6829-4631-a869-994fc1021b01> | 3.03125 | 422 | Documentation | Software Dev. | 39.780839 |
Make Your Own Chemicals
How To Purify Alcohol Using Distillation
Denatured alcohol is toxic. If you need pure ethanol, you can purify denatured, contaminated or impure alcohol using distillation. Here's how to do it.
How to Prepare Gases
Here are simple instructions for preparing common gases from ordinary chemicals. T... | <urn:uuid:ac1891e4-f8b1-4793-b785-3f2fb0b9b39e> | 3.5 | 721 | Tutorial | Science & Tech. | 31.135518 |
Brief SummaryRead full entry
BiologyBoth adults and larvae of this beetle are voracious predators, taking a wide range of prey including fish. They actively search for prey, and periodically swim to the surface in order to take in air (3). Adults often fly at night, and may land on glass surfaces or roads, mistaking th... | <urn:uuid:c00d76c8-ba1d-41e5-a1d2-b01d934317b3> | 2.984375 | 136 | Knowledge Article | Science & Tech. | 59.608994 |
(Phys.org) -- A team of American, Canadian and Chilean astronomers have stumbled onto a remarkably faint cluster of stars orbiting the Milky Way that puts out as much light as only 120 modest Sun-like stars. The tiny cluster, called Muñoz 1, was discovered near a dwarf galaxy in a survey of satellites around the Milky ... | <urn:uuid:231533fd-4357-4727-b395-151de437bb76> | 3.296875 | 214 | Content Listing | Science & Tech. | 37.413596 |
16th April 2004 - 09:04 PM
Research groups in the US and Austria say that they have found the best
evidence to date for superfluidity - the flow of a fluid without
resistance - in a Fermi gas made of ultracold lithium-6 atoms. The
results could help physicists understand more about other exotic systems
in nature, such ... | <urn:uuid:9fb60c2d-4085-4d51-9d38-7816f9efafd3> | 2.96875 | 434 | Comment Section | Science & Tech. | 45.683214 |
Most of the time I see matrix multiplication presented and defined, as a seemingly arbitrary sequence of operations. For example, the textbook I'm currently reading for a linear algebra course defines the product $AB$ as the $(i, j)$ entry in the $1 \times 1$ matrix that is the product of the ith row of $A$ and the jth... | <urn:uuid:19fdb2e7-8027-4639-8cdc-903553e0c27b> | 3.046875 | 219 | Q&A Forum | Science & Tech. | 47.991364 |
What was your best experience in the field covering this story?
Among the great pleasures of writing about an organism is gaining a window on the world of scientists obsessed by it. John Matthews, a young ecologist studying the migration of green darners, was among the dozens of wonderful and fanatical odonatologists I... | <urn:uuid:ac6f7ccd-fb3c-40a9-856c-c47077ff35d7> | 2.96875 | 652 | Audio Transcript | Science & Tech. | 46.760023 |
This package contains a collection of problems from the NRICH
website that could be suitable for students who have a good
understanding of Factors and Multiples and who feel ready to take
on some. . . .
A student in a maths class was trying to get some information from
her teacher. She was given some clues and then the... | <urn:uuid:309bc584-6139-43d2-bb92-bea4a69ad4de> | 4.03125 | 1,765 | Content Listing | Science & Tech. | 71.012712 |
When you try to put democracy into action you quickly run into tricky maths problems. This is what happened to Andrew Duff, rapporteur for the European Constitutional Affairs Committee, who was charged with finding a fair way of allocating seats of the European Parliament to Member States. Wisely, he went to ask the ex... | <urn:uuid:081bce36-04d2-4b20-8683-fc25ae8841e9> | 2.9375 | 867 | Content Listing | Science & Tech. | 44.345924 |
errno - error return value
The lvalue errno is used by many functions to return error values.
Many functions provide an error number in errno, which has type int and is defined in <errno.h>. The value of errno shall be defined only after a call to a function for which it is explicitly stated to be set and until it is c... | <urn:uuid:b550c442-971d-4053-9f07-dfafca7edfde> | 3.546875 | 565 | Documentation | Software Dev. | 53.795882 |
In Astrophysics, images, Interesting and funny, videos on March 28, 2013 at 06:47
An Image resembling an Angel has been captured by NASA’s Rover.
As is normal, this is being disputed.
Andel Like Form in Mars?
Now this is a mind blowing photo from the Opportunity Rover. It shows a human-like figure that seemingly has wi... | <urn:uuid:223aa86c-19b0-4656-be13-cf747088f03d> | 2.796875 | 1,164 | Content Listing | Science & Tech. | 56.067166 |
Black holes have been the stuff of science fiction since their discovery in the late sixties. But now a new, nimble NASA telescope is using its powerful x-ray vision to hunt for these abundant yet invisible, massive space oddities.
As bizarre as black holes have been depicted in science fiction, the reality of black ho... | <urn:uuid:a9c813f5-47ea-41e2-84c0-23f2f9387a86> | 3.421875 | 575 | Content Listing | Science & Tech. | 40.568103 |
Olympus Mons, lopsided giant 11 February 2009Posted by admin in current research, geoscience, Mars, solar system, volcanology.
Tags: Mars, Olympus Mons, solar system volcanism
Olympus Mons, the largest mountain and the largest volcano we know of in the Solar System, is a huge shield volcano on Mars. It rises 23km above... | <urn:uuid:167e2af2-19db-4e32-bb28-ef375227337d> | 3.59375 | 921 | Personal Blog | Science & Tech. | 27.952112 |
Educational - Cloud formation
Back to: Weather Q & A
Clouds form when air is cooled below its condensation temperature (dew point). The water vapor in the air condenses around tiny dust or salt particles suspended in the air, forming liquid water droplets, or if the temperature is cold enough, ice crystals (Dunlop and ... | <urn:uuid:ae8be51c-9ad3-4ee2-9cc0-b52d3e80b27f> | 4.625 | 622 | Knowledge Article | Science & Tech. | 58.263653 |
A recursive program calls itself as a subroutine. Recursion allows one to write programs that are powerful, yet simple and elegant. Often, a large problem can be handled by a small program which:
(defun factorial (n) (if (<= n 0) 1 (* n (factorial (- n 1))) ) )
Rule: Make sure that each recursive call involves an argum... | <urn:uuid:69f3ce74-c21a-4fc1-a31d-da5f712f63ed> | 3.859375 | 151 | Academic Writing | Software Dev. | 47.83 |
Hydrogen sulfide gas is a naturally occuring chemical (chemical formula H2S).
The gas has a characteristic rotten egg odor at low concentrations. About half of the population can smell it at concentrations as low as 8 parts per billion (ppb) in air, and more than 90% can smell it at levels of 50 ppb. At higher concentr... | <urn:uuid:e1a6c9c4-4d3c-4ab2-a33e-1f6e027188bb> | 4 | 361 | Knowledge Article | Science & Tech. | 33.521337 |
Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text o... | <urn:uuid:38625743-ada9-45c5-be36-2990a243a06f> | 3 | 2,451 | Content Listing | Science & Tech. | 38.316353 |
Fires in Australia's Northern Territory
On October 13, 2012, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image of fires burning in northern Australia. Smoke from the fires streams to the northwest due to trade winds blowing from the southeast. Red outl... | <urn:uuid:badbb6ed-90e4-4faf-9e41-76beb4cac20e> | 3.984375 | 228 | Knowledge Article | Science & Tech. | 31.581776 |
There's more to rain and snow than just water falling from the sky.
Hailstones are the result of an ice pellet or graupel being caught in a thunderstorm updraft and cycled through the cloud for several minutes, accreting multiple layers of ice in the process.
These are the conditions most likely to lead to measurable s... | <urn:uuid:1036b8c7-d6aa-4d41-b5b9-f684c5347efb> | 3.90625 | 662 | Nonfiction Writing | Science & Tech. | 43.879358 |
In this tutorial we are going to give you over view of JSP.
What is JSP ?
JSP is java based technology by using that you can develop web content that
holds both static and dynamic components.
It is developed by Sun Microsystems for server side development. It provides all the dynamic capabilities of Java Servlet techno... | <urn:uuid:57793264-e219-433c-af77-07f4796a0e96> | 3.21875 | 184 | Tutorial | Software Dev. | 53.25681 |
Yes, we’re excited.
Yes, we’re excited.
From hairy-chested yeti crabs to the deepest known fields, hydrothermal vents have been enjoying a bit of science celebrity in the last few weeks. Beneath the headlines, there has been an eruption of vent-related research published in the scientific literature and some exciting n... | <urn:uuid:79a72a02-2cc1-4e3a-b7d8-3db568bf121d> | 3.25 | 1,749 | Personal Blog | Science & Tech. | 40.661926 |
Andy Reisinger and Dan Zwartz discuss the interplay between climate change observations and models, looking in particular at the issue of sea-level rise.
They present some of the field science that tells us how and why sea level has changed in the past, and how it is changing now. They also discuss how much uncertainty... | <urn:uuid:2036d5e5-f5eb-438f-8292-bb33684a477d> | 3.078125 | 277 | Audio Transcript | Science & Tech. | 32.127666 |
Pi is an extremely interesting number, and the day to celebrate it is 3/14. The continuing pop culture references to Pi are evidence of the love people have for Math, and Math’s most widely known constant. Author of the Life of Pi, Yann Martel, said this of his choice of the name “Pi” for the novel’s protagonist: “I ch... | <urn:uuid:00ff0ea8-505c-4a20-985f-bc784e1ac08a> | 2.828125 | 190 | Personal Blog | Science & Tech. | 46.13 |
Zircon (ZrSiO4) is the principal repository for zirconium. It has a fairly simple structure. It has a tetragonal unit cell with a = 6.6 Angstrom units and c = 6. Zircon is perhaps the most important tetragonal mineral. Zirconium atoms are at the corners of the unit cell, the center, and at altitudes of 1/4c and 3/4 c a... | <urn:uuid:91b2e89d-0ebe-4656-aaf4-fd2d2e2f982b> | 3.265625 | 523 | Knowledge Article | Science & Tech. | 44.861797 |
Beginner’s Guide to Carbon Offsets
This offshore wind farm in Denmark includes 72 turbines and generates enough clean energy to power 110,000 homes.
Sometimes a person, family, company, city, or nation can not reduce the amount of carbon dioxide they release into the atmosphere from burning fossil fuels as much as they... | <urn:uuid:07b666de-122b-4e2b-8bb7-435147e0f053> | 3.734375 | 1,282 | Knowledge Article | Science & Tech. | 41.790118 |
5. Sensitivity of faint counts to the star formation history
Our simple SAM is not able to compute either the merging history of halos, or of the galaxies they host. However, we know that locally there is a tight correlation between major mergers on one side, LIRGs and ULIRGs on the other: at least 95 % of them are cur... | <urn:uuid:b7f463d7-a16c-4745-9984-3346f61af6cb> | 2.71875 | 1,800 | Academic Writing | Science & Tech. | 52.284934 |
With scientists wanting to see stuff in ever-finer detail and computer geeks wanting more and more transistors on their silicon, it is becoming increasingly important to be able to efficiently generate extreme ultraviolet radiation (1-75nm). The problem is that, once you get above a certain photon energy (in other word... | <urn:uuid:21378cda-93c6-440f-b86c-0c7334894217> | 3.84375 | 1,016 | Comment Section | Science & Tech. | 45.942294 |
Athens, Ga. Fish play a far more important role as contributors of nutrients to marine ecosystems than previously thought, according to researchers at the University of Georgia and Florida International University. In a pair of papers in the journal Ecology, they show that fish contribute more nutrients to their local ... | <urn:uuid:a1155a32-4b73-4eef-9631-14aaa4f63961> | 3.375 | 399 | Truncated | Science & Tech. | 33.512864 |
In today’s Programming Praxis exercise, our task is to print a list of all Oban numbers (numbers that don’t have an o if you write them in words). Let’s get started, shall we?
Since any number higher than 999 will have either the word “thousand” or one of the -illions in it, we only have to implement spelling numbers l... | <urn:uuid:93159c5d-bc27-48c0-be68-e45904b45cdd> | 3.984375 | 293 | Documentation | Software Dev. | 78.183581 |
It just started raining outside. The water that falls from the sky is assumed to be pure, resulting from the condensation of evaporated moisture generated from lakes, oceans and other physical water surfaces. A chemical analysis of Mt. Shasta snowfall water demonstrates excessive amounts of barium, strontium and alumin... | <urn:uuid:a61e6403-0774-447c-a16b-186bd8861dee> | 3.15625 | 831 | Personal Blog | Science & Tech. | 46.348036 |
The 2011 Nobel Prize in Physics, the most prestigious award given in the physics field, was announced on October 4. The winners are astronomers and astrophysicists who produced the first clear evidence of an accelerating universe. Not only is our universe as a whole expanding rapidly, it is in fact speeding up! It is n... | <urn:uuid:c9103246-9d50-43e7-abd0-3cf290dd8386> | 3.78125 | 1,216 | Personal Blog | Science & Tech. | 40.314505 |
In a web application, you should verify that the following items are safe for operation in a multi-threaded environment:
- servlet classes
- servlet filter classes
- items placed in application scope
- items placed in session scope
Many applications use a framework. Frameworks usually define the servlet class, and the ... | <urn:uuid:4d71a859-09cd-4b33-94cd-6bde4fc1edaa> | 2.6875 | 490 | Tutorial | Software Dev. | 34.490652 |
Activity of the Month
Back to Table of Contents
Each month the Math Forum sponsors a student activity that can be done locally and shared globally. There are:
What is a magic square?In a magic square, the rows, columns, and diagonals all add up to the same number.
Let's begin with the first three numbers:
Can you fill ... | <urn:uuid:7fca1847-efa3-448f-b184-7f0caabea65e> | 3.375 | 332 | Content Listing | Science & Tech. | 63.668008 |
2.1. Supernova Types
Morphologically, Supernovae are distinguished into two main classes, Type I and Type II according to the main criterion of whether their spectra (thus, their ejecta) contain Hydrogen (Type II) or no Hydrogen (Type I).
Type II SNe are produced by the core collapse of massive stars, say, more massive... | <urn:uuid:4d04ac3e-b10d-4156-9d59-73dabb331f5d> | 3.734375 | 3,050 | Academic Writing | Science & Tech. | 60.114205 |
Researchers find the source of an epidemic using relatively little information. Their technique could also help authorities track down contamination in water systems or locate problems in electrical grids.
Phys. Rev. Focus26, 20 (2010) – Published November 12, 2010
Foraging animals or other randomly moving entities can... | <urn:uuid:751faffc-450a-4673-bc51-c68cab215d24> | 3.28125 | 141 | Content Listing | Science & Tech. | 33.689444 |
It looks like the scientists who have predicted unending global warming caused by CO2 emissions may be in serious error.
No one knows exactly how much Earth's climate will warm due to carbon emissions, but a new study this week suggests scientists' best predictions about global warming might be incorrect. The study, wh... | <urn:uuid:31a21f4c-c34c-494f-bbd9-9a062b4cfab6> | 2.796875 | 531 | Personal Blog | Science & Tech. | 44.584272 |