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Who can we blame for all this?
Molecular manufacturing enthusiasts trace the idea to 1959 and Nobel laureate Richard Feynmann's famous lecture "There's Room at the Bottom". In it, he suggested that it ought to be possible to rearrange atoms "the way we want…all the way down." Far enough down, he said, "all of our devic... | <urn:uuid:331c9d32-0753-40be-b4a0-c5ba883e059d> | 2.859375 | 1,116 | Comment Section | Science & Tech. | 48.991244 |
Each of the two atomic bomb blasts were thought to have been approximately equivalent to a blast produced from 20,000 tons of TNT (The Manhattan Engineer District, 1946).
Figures 4 and 5 are photos depicting the “mushroom clouds” that formed as the bombs were dropped on Hiroshima and Nagasaki respectively.
(To see reco... | <urn:uuid:f5b40e65-ec1d-49f5-af88-3dbe06b58cce> | 3.75 | 382 | Knowledge Article | Science & Tech. | 41.846375 |
Global names are used to denote value variables, value constructors (constant or non-constant), type constructors, and record labels. Internally, a global name consists of two parts: the name of the defining module (the module name), and the name of the global inside that module (the local name). The two parts of the n... | <urn:uuid:d2578867-56a5-4d08-b8d6-b6c44ca0c7a5> | 3.78125 | 646 | Documentation | Software Dev. | 27.833896 |
The Acoustic Doppler Current Profiler (ADCP) measures the speed and direction of ocean currents using the principle of “Doppler shift”. Anyone who has ever heard a train whistle is familiar with the Doppler effect. When the train is traveling towards you, the whistle’s pitch is higher. When it is moving away from you, ... | <urn:uuid:56c9cde1-cf8f-4c20-85ba-2fca53ea3f76> | 4.03125 | 642 | Knowledge Article | Science & Tech. | 43.311469 |
Siam named the following as the most important algorithms of the 20th century:
1946: The Metropolis Algorithm for Monte Carlo. Through the use of random processes, this algorithm offers an efficient way to stumble toward answers to problems that are too complicated to solve exactly.
1947: Simplex Method for Linear Prog... | <urn:uuid:6c781eea-ee35-4f64-a744-c5e6dde7b690> | 3.203125 | 296 | Q&A Forum | Software Dev. | 32.795534 |
Lua is an extension programming language designed to support general procedural programming with data description facilities. It also offers good support for object-oriented programming, functional programming, and data-driven programming. Lua is intended to be used as a powerful, light-weight scripting language for an... | <urn:uuid:876d5a6b-8734-498e-8898-ce4d649fefb2> | 3 | 419 | Knowledge Article | Software Dev. | 43.820826 |
strchr - string scanning operation
char *strchr(const char *s, int c);
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standar... | <urn:uuid:29b44ee6-a18c-4b53-8d2d-3bddd75c56c5> | 2.734375 | 206 | Documentation | Software Dev. | 76.329423 |
Secrecy and competition to achieve breakthroughs have been part of scientific culture for centuries, but the latest Internet advances are forcing a tortured openness throughout the halls of science and raising questions about how research will be done in the future.
The openness at the technological and cultural heart ... | <urn:uuid:f033c30e-5dbc-4208-b24e-3321992250e7> | 3.078125 | 2,114 | Personal Blog | Science & Tech. | 37.247523 |
lurk in clouds of glowing hydrogen gas in
emission nebula is found near the edge of a
large molecular cloud, unseen at visible wavelengths,
in the southern
Ara, about 4,000 light-years away.
stars of the embedded Ara
were formed in that region only a few million years ago,
sculpting the dark shapes and
powering the neb... | <urn:uuid:4482fc8d-ab15-47ac-a88d-23a0651366bf> | 3.375 | 234 | Knowledge Article | Science & Tech. | 43.503514 |
Alaska’s Ice Drain 2004-07
Alaska has only about 5% of the total ice Greenland has — but from 2004 to 2007, Alaska shed an average of 80 billion metric tons per ear, under half the amount that Greenland did. Put another way, relative to its own stock, Alaska is losing ice about eight times faster than Greenland.
This t... | <urn:uuid:18358d70-1dfa-4f81-9336-73a105d4b9bc> | 3.75 | 502 | Knowledge Article | Science & Tech. | 45.249037 |
THE BASIC FACTS and INFORMATION ABOUT SOLAR ENERGY
WHAT IS IT?
The sun is shining brightly every day, bathing the world with light and heat. But besides for these benefits, sunlight also miraculously carries energy, which can be captured and used for a variety of purposes. Before we go over practical solar energy facts... | <urn:uuid:94f699a4-2e40-4029-9b3d-8b2406b87ae2> | 3.609375 | 1,779 | Knowledge Article | Science & Tech. | 54.578825 |
Kepler in Brief
A Nutshell Description of the Kepler Mission
The Kepler Mission is a NASA Discovery Program for detecting potentially life-supporting planets around other stars. All of the extrasolar planets detected so far by other projects are giant planets, mostly the size of Jupiter and bigger. Kepler is poised to ... | <urn:uuid:4bf12376-6fa9-4a29-9c17-05e600806334> | 4.28125 | 338 | Knowledge Article | Science & Tech. | 58.080924 |
Pumping sulphur particles into the atmosphere to mimic the cooling effect of a large volcanic eruption has been proposed as a last-ditch solution to combating climate change - but doing so would cause problems of its own, including potentially catastrophic drought, say researchers.
Sulphur "sunshades" are just one exam... | <urn:uuid:96883693-c3f4-443a-a39a-70f520062199> | 3.890625 | 1,504 | Comment Section | Science & Tech. | 44.312608 |
A lot of information can be gained from stellar spectra e.g. the stellar ages, velocities, evolutionary stage, abundances, as well as the composition of the environment they were born in. High quality spectra allow us to derive stellar abundances of about 2/3 of the elements in the periodic table. By comparing abundanc... | <urn:uuid:7f97256a-bc91-45e3-895a-c3db00da4b8c> | 3.953125 | 343 | Academic Writing | Science & Tech. | 46.299776 |
|Nov14-12, 02:57 AM||#1|
Flux trapping effect.
Magnetic suspension and levitation is the caused by the flux trapping effect in superconductors.How does this flux get "trapped"?
Another quick question-
We link a magnet to a superconductor by bringing it very close to one ,until both of them start attracting and repellin... | <urn:uuid:96f7ef48-b8c9-4d59-bfb0-cbc0386d5e3a> | 3.34375 | 382 | Comment Section | Science & Tech. | 52.228161 |
The Trouble with Gerrold: Self-validating code
January 15, 2013 —
(Page 1 of 4)
Related Search Term(s): debugging
At the beginning, it was called “microcomputing.” Enthusiasts were delighted at the idea that computing could finally be freed from the “priesthood.” Magazines like “Creative Computing” and "Byte” and “Kilo... | <urn:uuid:cbc27a8e-dfc9-4105-a22a-2e8f5ef19ce3> | 2.90625 | 510 | Truncated | Software Dev. | 44.583743 |
WHY DOES A PINE TREE PRODUCE TURPENTINE?
Q. Why would a tree living in a habitat that catches fire every few years produce turpentine, a highly flammable substance?
That question was asked as I was building a fire at home with a piece of fat lighter, wood from the stump of a long-dead pine tree. Fat lighter, also known... | <urn:uuid:23105efc-c7e6-4661-9d34-c8fad0a1a9f0> | 3.796875 | 903 | Q&A Forum | Science & Tech. | 44.781943 |
Science subject and location tags
Articles, documents and multimedia from ABC Science
Wednesday, 24 April 2013 7
Ask an Expert Where does the solar system end, and has Voyager 1 crossed the edge yet?
Monday, 22 April 2013
All systems go An Antares rocket, one of two launchers developed with NASA backing to fly cargo ca... | <urn:uuid:4b103bcc-50ad-4e27-9276-a3626138387d> | 3.015625 | 643 | Content Listing | Science & Tech. | 41.550814 |
lugwormArticle Free Pass
lugworm, (genus Arenicola), any of several marine worms (class Polychaeta, phylum Annelida) that burrow deep into the sandy sea bottom or intertidal areas and are often quite large. Fishermen use them as bait. Adult lugworms of the coast of Europe (e.g., A. marina) attain lengths of about 23 cm... | <urn:uuid:c4b228b4-04a2-469e-b2ed-56d368c20c34> | 3.4375 | 299 | Knowledge Article | Science & Tech. | 63.420004 |
Common Lisp the Language, 2nd Edition
The Common Lisp facility for generating pseudo-random numbers has been carefully defined to make its use reasonably portable. While two implementations may produce different series of pseudo-random numbers, the distribution of values should be relatively independent of such machine... | <urn:uuid:2c466ce2-1fe1-410b-babd-95105cbc53f9> | 3.234375 | 1,278 | Documentation | Software Dev. | 53.45356 |
Lightning in Canada
Did you know that lightning flashes occur in Canada about 2.34 million times a year, including about once every three seconds during the summer months? Did you also know that each year in Canada, lightning strikes kill up to 10 people, seriously injure up to 164 others, and ignite some 4,000 forest ... | <urn:uuid:17c16dfe-adb3-477d-b7b6-fca6934d9577> | 3.515625 | 267 | Knowledge Article | Science & Tech. | 50.360205 |
How Science Works
Scientific Knowledge - Uses - Limitations.
Scientific knowledge can used to develop technology.
The results of improved
can be more useful to some people than to others.
For example, developing genetic changes to crops
to make them grow in hot dry conditions might be more useful
to people living neare... | <urn:uuid:1252348d-beb5-49b2-8aea-8079dceeb94c> | 3.78125 | 247 | Knowledge Article | Science & Tech. | 43.509412 |
1. A glass flask whose volume is exactly 1000cm^3 at 0 degrees Celsius is completely filled with mercury at this temperature. When the flask and mercury are heated to 100 degrees Celsius, 15.2cm^3 of mercury overflow. If the coefficient of volume expansion of mercury is 18 x 1...
variable saparable(separation of variab... | <urn:uuid:b19c53d5-59d6-4a85-a23f-00ae3f087b1e> | 3.296875 | 453 | Comment Section | Science & Tech. | 92.470912 |
“Predator” bacteria (green) surround “prey” bacteria (red) in this petri dish version of the Serengeti. Rather than eating their prey, however, predator cells release a chemical that activates a suicide gene in the prey. Prey cells also release a chemical, but one that promotes survival of the predators. Researchers ge... | <urn:uuid:ccdd3db1-ea0b-4b2b-885f-f0b5243ec8b3> | 3.109375 | 160 | Knowledge Article | Science & Tech. | 36.646071 |
Solar Energy it is Energy from the Sun
Solar Energy Can Be Used for Heat and Electricity
Solar thermal energy:
There are many applications for the direct use of solar thermal energy, space heating and cooling, water heating, crop drying and solar cooking. It is a technology which is well understood and widely used in m... | <urn:uuid:903ec154-718e-46c4-a3d7-14354d8ab29c> | 3.21875 | 796 | Knowledge Article | Science & Tech. | 29.723841 |
The 'Pioneer anomaly' - the mystifying observation that NASA's two Pioneer spacecraft have drifted far off their expected paths - cannot be explained by tinkering with the law of gravity, a new study concludes.
The study's author suggests an unknown, but conventional, force is instead acting on the spacecraft. But othe... | <urn:uuid:48c72ba4-7085-46b3-8117-81921da98f66> | 3.6875 | 1,746 | Comment Section | Science & Tech. | 47.304614 |
When an electron collides with an atom or ion, there is a small probability that the electron kicks out another electron, leaving the ion in the next highest charge state (charge q increased by +1). This is called electron-impact ionization and is the dominant process by which atoms and ions become more highly charged.... | <urn:uuid:716dc55f-ad7c-480f-828e-32665f8aa931> | 3.09375 | 985 | Academic Writing | Science & Tech. | 24.725172 |
Ether is a class of organic compounds which contain an ether group — an oxygen atom connected to two (substituted) alkyl or aryl groups — of general formula R–O–R'. A typical example is the solvent and anesthetic diethyl ether, commonly referred to simply as "ether" (ethoxyethane, CH3-CH2-O-CH2-CH3).
cannot form hydrog... | <urn:uuid:c378a27e-491b-4f83-87fe-b27cad4360f2> | 3.875 | 1,735 | Knowledge Article | Science & Tech. | 34.932905 |
Want to stay on top of all the space news? Follow @universetoday on TwitterSedimentary rock covers 70% of the Earth. Erosion is constantly changing the face of the Earth. Weathering agents…wind, water, and ice…break rock into smaller pieces that flow down waterways until the settle to the bottom permanently. These sedi... | <urn:uuid:805ab979-777a-4e6d-a60e-66a9c207b774> | 4.125 | 512 | Knowledge Article | Science & Tech. | 46.774374 |
The getpass module provides two functions:
Prompt the user for a password without echoing. The user is prompted using the string prompt, which defaults to 'Password: '. On Unix, the prompt is written to the file-like object stream. stream defaults to the controlling terminal (/dev/tty) or if that is unavailable to sys.... | <urn:uuid:36796a59-3d59-488c-b826-4ebec1eafcc3> | 3.140625 | 243 | Documentation | Software Dev. | 51.3036 |
The short answer: it could take awhile!
Temperatures will climb into the mid 40s over the weekend and there should be plenty of sunshine. Without a doubt, that will help. However with so much snow packed in, the snow won't just immediately melt.
There are two primary factors control the melting of snow, according to re... | <urn:uuid:a293b4aa-f601-49bb-b848-52f449af157d> | 3.328125 | 325 | Knowledge Article | Science & Tech. | 53.016289 |
Date of this Version
Estimates of streambed water fl ux are needed for the interpretation of streambed chemistry and reactions. Continuous temperature and head monitoring in stream reaches within four agricultural watersheds (Leary Weber Ditch, IN; Maple Creek, NE; DR2 Drain, WA; and Merced River, CA) allowed heat to b... | <urn:uuid:b67991a5-7edb-41d3-a3d7-a8a558f6f211> | 3.046875 | 331 | Academic Writing | Science & Tech. | 34.343102 |
12.1.4 Writer Implementations
Three implementations of the writer object interface are provided as
examples by this module. Most applications will need to derive new
writer classes from the NullWriter class.
- class NullWriter()
A writer which only provides the interface definition; no actions are
taken on any methods.... | <urn:uuid:84ae71a2-4534-497d-bc2f-d6b40cc0ac50> | 2.734375 | 210 | Documentation | Software Dev. | 47.894675 |
Low Earth orbit
||This article needs additional citations for verification. (May 2012)|
A low Earth orbit (LEO) is generally defined as an orbit below an altitude of approximately 2,000 kilometers (1,200 mi). Given the rapid orbital decay of objects below approximately 200 kilometers (120 mi), the commonly accepted def... | <urn:uuid:e8b0402f-5a70-49d9-a43c-198fab702a1c> | 3.984375 | 1,297 | Knowledge Article | Science & Tech. | 42.01045 |
common name: goatweed butterfly, goatweed emperor, goatweed leafwing
scientific name: Anaea andria Scudder (Insecta: Lepidoptera: Nymphalidae: Charaxinae)
The goatweed butterfly is an attractive, fascinating and widespread species that is not often observed by the general public because of its cryptic coloration and so... | <urn:uuid:9c9641d0-043f-49e5-9760-978e32132d40> | 3.1875 | 1,463 | Knowledge Article | Science & Tech. | 48.991667 |
<language> (UML) A non-proprietary, third generation modelling language. The Unified Modeling Language is an open method used to specify, visualise, construct and document the artifacts of an object-oriented software-intensive system under development. The UML represents a compilation of "best engineering practices" wh... | <urn:uuid:18e48ee8-b3ff-48e9-835f-353700361b6d> | 3.546875 | 248 | Knowledge Article | Software Dev. | 21.540317 |
The two posts on changing the seasons (here and here) resulted in a lot of interesting information in the comments and it seems like there is quite a geographical variation in how the seasons are demarcated, with the US possibly being an outlier in using the solstices.
Reader ahcuah is a kindred soul and has kindly sen... | <urn:uuid:a97523ac-4e59-49a8-999f-b9049484e34e> | 2.90625 | 605 | Personal Blog | Science & Tech. | 45.865803 |
The quantities Rm, Ra, Cm, Vm, etc. that appear in the diagram and equation are given in ohms, farads, or volts, and will depend on the size of the compartment. In order to specify parameters that are independent of the compartment dimensions, specific units are used. For a cylindrical compartment, the membrane resista... | <urn:uuid:93150521-d1dd-4854-b28b-8bc036c048eb> | 3.296875 | 289 | Tutorial | Science & Tech. | 36.455 |
Given that p is prime, when is 8p+1 square?
Let 8p + 1 = k2. As LHS is odd, k must be odd; let k = 2m + 1.
Therefore 8p + 1 = 4m2 + 4m + 1, leading to 2p = m2 + m = m(m + 1).
As m and m + 1 are consecutive integers, one of them must be even. However, after dividing through by 2 we can see that LHS is prime, so RHS must... | <urn:uuid:99c96b03-7489-4261-b310-377c5e68b125> | 2.765625 | 163 | Q&A Forum | Science & Tech. | 116.537549 |
Invaders or endemics? Molecular phylogenetics, biogeography and systematics of Dreissena in the Balkans
Article first published online: 5 JUN 2007
Volume 52, Issue 8, pages 1525–1536, August 2007
How to Cite
ALBRECHT, C., SCHULTHEIß, R., KEVREKIDIS, T., STREIT, B. and WILKE, T. (2007), Invaders or endemics? Molecular p... | <urn:uuid:db0857c9-b916-4242-9f4d-a93c06214e87> | 2.71875 | 705 | Academic Writing | Science & Tech. | 38.587981 |
Basically how do you find out which could be your worst or best case and any other "edge" cases you might have BEFORE having them and so, how do you prepare your code for them?
migrated from stackoverflow.com May 1 '11 at 7:47
Based on the content of the algorithm you can identify what data structures/types/constructs ... | <urn:uuid:ff25b0b1-d0bb-45d3-9300-d14478a980d0> | 3.0625 | 643 | Q&A Forum | Software Dev. | 62.546591 |
Before the Berlin Wall fell, before the Soviet
Union imploded, we feared mutually assured destruction. From the 1950s
until some 40 years later, the threat of nuclear war loomed large, inspiring
nightmares among children and adults alike. In fact, for years, being
a survivalist implied having a bomb shelter.
But with t... | <urn:uuid:e5a5ba70-5dde-4e6c-b18a-8a5e62943b53> | 2.703125 | 943 | Personal Blog | Science & Tech. | 50.950723 |
Mistletoes and butterflies
Mistletoes as food plants for Butterflies
The use of mistletoes as food plants by butterflies has generated a whole field of research which spans several continents. In Africa, for example, caterpillars of the genus Mylothris feed almost exclusively on plants of the order Santalales, and with... | <urn:uuid:7c35da40-071b-4c36-95ae-61b86e331b26> | 3.4375 | 342 | Knowledge Article | Science & Tech. | 29.277923 |
The syntax looks like this:
BEGIN TRY “Your code goes here” END TRY BEGIN CATCH “Your error condition code goes here” END CATCH
What happens when TRY/CATCH block implemented. Let’s go into the details. Whatever code you are writing inside the try block will get executed by default. When an error occurred for the code w... | <urn:uuid:1a8f0137-3a87-42a4-9ee8-0aa411c280fc> | 3.203125 | 331 | Documentation | Software Dev. | 56.841829 |
Perched on a cliff in San Diego, California, reminiscent of Mary Shelley’s novel in which a scientist, Dr. Frankenstein, creates artificial life, Dr. Gerald Joyce can be considered his modern day counterpart. Dr. Joyce is also trying to create life, but in a thimble-size test tube, rather than from human body parts.
Al... | <urn:uuid:717c34c2-1669-4c85-ac50-a680a1ee2436> | 2.859375 | 308 | Personal Blog | Science & Tech. | 57.96337 |
Fast Ball Physics
Is there away to calculate the speed of my sons pitch with
a stop watch? He throws from 60 feet 6 inches.
Not likely unless you have a fast finger! Let's say your son throws a 60
mph fastball -- that's equal to
88 ft/sec. Since the distance from mound to plate is 60.5 ft, that is a
lapsed time of ~0.7... | <urn:uuid:fc122f8a-014e-41c3-a421-2b481ebb39e1> | 2.84375 | 128 | Knowledge Article | Science & Tech. | 90.317294 |
How does a fridge work?
Recently voted the most significant invention in the history of food and drink, the fridge has transformed our lives. We can keep food fresher for longer, medicines unspoilt and have that refreshing cool drink on hot days. But how does the fridge work?
The fridge has four main components - the i... | <urn:uuid:ab8ba952-f81f-4aad-8daf-1eb1355dbf21> | 3.609375 | 186 | Knowledge Article | Science & Tech. | 63.205299 |
23. January 2013Matter and Material User Experiments Research Using Synchrotron Light
Interview with Thomas Huthwelker
The Paul Scherrer Institut makes its research facilities available to scientists from all over the world. To ensure these scientists are exposed to optimal conditions when they arrive is the hard work ... | <urn:uuid:219b57f0-39a2-4e00-bf9a-ef1629f0edad> | 2.703125 | 1,443 | Content Listing | Science & Tech. | 26.264438 |
What is XPCE?
XPCE is a toolkit for developing graphical applications in Prolog and other interactive and dynamically typed languages. XPCE follows a rather unique approach of for developing GUI applications, which we will try to summarise using the points below.
- Add object layer to Prolog
XPCE's kernel is a object-o... | <urn:uuid:00379618-ad70-4276-9169-6bc75c160558> | 2.84375 | 652 | Knowledge Article | Software Dev. | 31.150715 |
Convex hull, developed at the Research Imaging Center (RIC), uses algorithms to "warp" images of human brains and make them ready for scientific comparison. The task is much like fitting a grapefruit inside an orange. No two brains have the exact same size, shape and structure. Identifying the functions of different pa... | <urn:uuid:68e99e26-e5b7-4649-9906-3a8684258aa0> | 3.640625 | 797 | Knowledge Article | Science & Tech. | 54.618387 |
Previous abstract Next abstract
The Diffuse Infrared Background Experiment (DIRBE) aboard the Cosmic Background Explorer (COBE) has provided the first full-sky linear polarization survey in the near-infrared, at 1.25 $\mu$m, 2.2 $\mu$m and 3.5 $\mu$m. A set of 41 weekly averaged maps include the linear Stokes parameter... | <urn:uuid:a1eb8b4a-18df-4bd1-9f76-a3e2a74fd5aa> | 2.734375 | 277 | Academic Writing | Science & Tech. | 42.168598 |
Today's sky searches
An asteroid-seeker talks about the search process and Clyde Tombaugh's impact on astronomy.
December 21, 2005
|Lowell Observatory in Flagstaff, Arizona, became a household name after Clyde Tombaugh discovered Pluto from there in 1930. The observatory has remained in the forefront of astronomical fi... | <urn:uuid:61eedb78-3090-42a7-93bd-e03ac80a2b4f> | 2.71875 | 262 | Truncated | Science & Tech. | 35.30373 |
...and fine-tune it.
Apparently, it's been know for awhile now that airborne bacterial streams could prompt precipitation in the form of rain or snow. The single-celled bodies which make up these streams serve as "nucleators" that water vapor can coalesce and freeze around. However, how ubiquitous these streams were, a... | <urn:uuid:86a3068d-c263-4f6b-a133-a5aeda0688e6> | 3.09375 | 202 | Comment Section | Science & Tech. | 34.01295 |
Brief SummaryRead full entry
BiologyWith its life cycle wholly dependent on infrequent showers of rain, the Raso lark has a particularly precarious existence (2). During periods of drought, one of the few sources of food and water for this species is provided by the small subterranean bulbs of the nutsedges, Cyperus bu... | <urn:uuid:369ce165-8d6d-47d9-a225-971d2fb4226f> | 3.90625 | 513 | Knowledge Article | Science & Tech. | 39.514 |
An affiliated website was created specifically for the 2009 National Climate Assessment so that the report would be more accessible to a variety of interested readers.
Visit the "Executive Summary" page on the 2009 National Climate Assessment website to find more information on the following key findings from the repor... | <urn:uuid:aa6198de-dd4e-484f-98d0-6003afcf7913> | 3.3125 | 208 | Content Listing | Science & Tech. | 24.986364 |
Kreisimpressionen--nicht nur (!) mathematisch
Library Home || Full Table of Contents || Suggest a Link || Library Help
|A lesson plan in which students discover the equation of a circle, to describe an everyday object containing a circle or circles. The project also involves work with TI-89 calculators and Derive, as w... | <urn:uuid:be1f332d-acd3-461d-8c00-fc5d2e379cb4> | 3.625 | 211 | Content Listing | Science & Tech. | 36.545625 |
A father (m = 94 kg) and son (m = 48 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3 m/s after they have separated. How fast will the father be moving?
Which equation is used to solve this? Can you set up the problem for me? | <urn:uuid:bccf3f51-523c-4247-8f1d-49c99d008a72> | 2.875 | 73 | Q&A Forum | Science & Tech. | 90.315 |
m is the real parameter.
Find the real number and sign for the equation :
By two methods : graphic , algebric.
Intersect the graph of with parallel lines to x-axis with equation
If then the line doesn't intersect the graph.
If the line is tangent to the graph and the equation has a double solution
If the line intersect... | <urn:uuid:c019545b-effe-4f90-bd37-46344f14795f> | 3.09375 | 113 | Tutorial | Science & Tech. | 55.085 |
Address of Overloaded Functions
Use of a function name without arguments returns the address of that function. For example:
int Func( int i, int j ); int Func( long l ); ... int (*pFunc) ( int, int ) = Func;
In the preceding example, the first version of Func is selected, and its address is copied into pFunc.
The compi... | <urn:uuid:0c1b6309-9f49-41a2-9789-f0f00a3bbc07> | 3.828125 | 225 | Documentation | Software Dev. | 42.786336 |
Carbon semiconductors using sheets of pure graphene are being proposed at Brown University, which recently proposed a method for removing defects from graphene semiconductors. Look for the switch from silicon to carbon semiconductors over the next 20 years. R.C.J.
Professor Vivek Shenoy (right) and graduate student Akb... | <urn:uuid:8f7c1879-f31c-4215-936f-6db2fa329123> | 3.421875 | 163 | Truncated | Science & Tech. | 33.200741 |
Forensic entomologists, of course.
These are the strong-stomached folks who study the arthropod fauna that colonizes dead flesh. Their knowledge of insect taxonomy, ecology, and development can be used to provide estimates of the time and conditions of death. Or zombification, in the present case.
Hypothetically, suppo... | <urn:uuid:09ce061f-3011-4fb7-9152-ccbad93729f5> | 2.8125 | 286 | Personal Blog | Science & Tech. | 53.989847 |
New research finds that one species of moth is capable of actively jamming the sonar used by moth-hunting bats. This biological equivalent of the 'electronic countermeasures' used by the military to jam radar and sonar signals is described in the journal Science. In the study, researchers used ultrasonic recording and ... | <urn:uuid:704e81f7-eea7-41b6-bd0a-1bca51045ff5> | 3.203125 | 149 | Truncated | Science & Tech. | 38.566522 |
Comment: 17:35 - 18:25 (00:50)
Source: Annenberg/CPB Resources - Earth Revealed - 9. Earthquakes
Keywords: Parkfield, "Tom Daley", "San Andreas Fault", "fault structure", "Vibra-seis truck", wave, energy, velocity, "subsurface structure", earthquake
Our transcription: One of the most fundamental aspects of the Parkfiel... | <urn:uuid:d65ef146-c8e5-4936-ab67-cbd5d26d0828> | 3.53125 | 278 | Knowledge Article | Science & Tech. | 34.662608 |
Science Fair Project Encyclopedia
A person who emits noise (with the voice or otherwise) either loudly or a lot of the time can be described as loud. Whether this is an insult or a compliment is a matter of personal preference: some people self-describe as "loud" while many others consider "loud" people to be intensely... | <urn:uuid:f58ac637-9f2f-43aa-8dec-6fbd0e92d3d5> | 3.09375 | 111 | Knowledge Article | Science & Tech. | 37.628674 |
Black Holes in Distant Galaxy Points to Wild Youth
Chandra's image of the lenticular (an elliptical-type galaxy with a disk of old stars) galaxy NGC 1553 reveals diffuse hot gas dotted with many point-like sources. As in the elliptical galaxies, NGC 4649 and NGC 4697, the point-like sources are due to black holes and n... | <urn:uuid:b0a54609-eeda-4870-a7a7-5c16cae731e4> | 3.703125 | 254 | Knowledge Article | Science & Tech. | 42.099296 |
On 56th independence day, August 15 2003, India's Prime Minister Atal Bihari Vajpayee announced. "Our country is now ready to fly high in the field of science. I am pleased to announce that India will send her own spacecraft to the moon by 2008. It is being named Chandrayaan-1". In Sanskrit (language of Ancient India) ... | <urn:uuid:3fd81051-2d09-4321-ae85-4ec40b719c58> | 3.28125 | 261 | Knowledge Article | Science & Tech. | 55.646214 |
This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
Thanks for giving reply of my question. Their is another method with the name of parseInt it has two arguments ... | <urn:uuid:4fd8701a-4239-47d2-a2cb-a228fa5b4707> | 3.484375 | 382 | Comment Section | Software Dev. | 67.376485 |
Elasmobranchii (sharks and rays) > Carcharhiniformes
(Ground sharks) > Pseudotriakidae
Etymology: Gollum: Taken from a personnage of the J.R.R.Tolkien works "The Lord of the rings".
Environment / Climate / Range
Marine; bathydemersal; depth range 120 - 660 m (Ref. 26346), usually 400 - 600 m (Ref. 13566). Deep-water; -... | <urn:uuid:f745c6cf-8178-43de-aa3a-1557289231fc> | 3.046875 | 706 | Knowledge Article | Science & Tech. | 62.305976 |
What is Genomics
Genomics is a study of the genomes of organisms. It main task is to determine the entire sequence of DNA or the composition of the atoms that make up the DNA and the chemical bonds between the DNA atoms. Knowledge of the DNA sequence has become an important part of biological research but it is also of... | <urn:uuid:02e0632b-5d9b-4fd1-bcc9-9508137b4093> | 3.65625 | 644 | Knowledge Article | Science & Tech. | 29.941527 |
Science Needs and New Technology for Increasing Soil Carbon Sequestration
F. B. Metting and R. Cesar Izaurralde
Abstract Fossil fuel use and land use change that began over 200 years ago are driving the rapid increase in atmospheric content of CO2 and other greenhouse gases that may be impacting climatic change (Hought... | <urn:uuid:f2fec39c-079f-4ead-9427-1a1aa75de057> | 3.171875 | 323 | Academic Writing | Science & Tech. | 25.4576 |
Tangent Circles Theorem: Common Tangents & Concurrent Point.
School, SAT Prep, College
The common tangents of three mutually
tangential circles A,
B, and C taken in pairs are concurrent in the point P. P is the
incenter of triangle ABC (center of the incircle).
Dynamic Geometry: You can alter the figure above
dynamical... | <urn:uuid:b67ff227-781a-4b72-aeca-d67ae8b22b3a> | 3.390625 | 250 | Tutorial | Science & Tech. | 53.173636 |
How much energy does our global population of nearly 7 billion use every year? According to the US Energy Information Administration (EIA), total primary energy consumption came to 493 quadrillion — that’s 493,000,000,000,000,000 — BTUs in 2008, the most recent year for which figures are available. (One BTU, or British... | <urn:uuid:2c615582-3d77-46d4-b03d-6b5bbb8a6d75> | 3.25 | 332 | Knowledge Article | Science & Tech. | 50.861732 |
A slurry of rocks and mud sounded like a freight train when it ripped through a popular Mount Rainier hiking destination in 2001 and scared some television viewers who believed their homes were in the path.
As it turned out, the debris flow at Comet Falls proved less dangerous than initially believed, but it gave scien... | <urn:uuid:10cd7f70-6614-4856-99cf-620d525967fb> | 3.515625 | 959 | Truncated | Science & Tech. | 54.351531 |
Stars produce energy through nuclear fusion, producing heavier elements from lighter ones. The heat generated from these reactions prevents gravitational collapse of the star. Over time, the star builds up a central core which consists of elements which the temperature at the center of the star is not sufficient to fus... | <urn:uuid:aa7ddb99-6237-45ea-a1cc-eb7a2929f1bb> | 3.625 | 1,997 | Knowledge Article | Science & Tech. | 39.287737 |
- Jarred Figlar-Barnes
- Elma, WA
- United States
Pykrete a glacier???
If you have ever seen the show Mythbusters, you would know of a material called Pykrete. It is 10-15% sawdust mixed 85-90% water. When frozen this material takes a far longer time to melt than regular ice, it is also much tougher than ice too. What ... | <urn:uuid:61cb12b5-53ff-47cb-af91-c82e18844f38> | 3.015625 | 355 | Audio Transcript | Science & Tech. | 63.331735 |
10.20.11 - Using data from the Herschel Space Observatory, astronomers have detected for the first time cold water vapor enveloping a dusty disk around a young star.
10.05.11 - Astronomers have found a new cosmic source for the same kind of water that appeared on Earth billions of years ago and created the oceans.
09.2... | <urn:uuid:2266d33c-1d1d-4a99-88f8-5c5ac2126f33> | 3.65625 | 647 | Content Listing | Science & Tech. | 66.443098 |
Why are insects so energy-efficient while flying? Is it because of their light weight and aerodynamics or due to very efficient biochemical transformations (food->energy)?
Insect flight muscle is capable of achieving the highest metabolic rate of all animal tissues, and this tissue may be considered an exquisite exampl... | <urn:uuid:692aa10a-0db3-4e1a-ad67-f98085b7b8bf> | 3.40625 | 339 | Q&A Forum | Science & Tech. | 51.48278 |
It's traditional to think of the real numbers as divided up into three types of number: the rational numbers, the algebraic numbers, and the leftovers known collectively as the transcendental numbers. If you're not familiar with those terms I'll be explaining them below. We can represent this as follows:
I'm using unic... | <urn:uuid:79ed062a-09ad-4c02-b6ab-eae85b186794> | 3.875 | 2,945 | Personal Blog | Science & Tech. | 54.323311 |
See Also: Nullable<T> Members
- Documentation for this section has not yet been entered.
The Nullable<T> value type represents a value of a given type T or an indication that the instance contains no value. Such a nullable type is useful in a variety of situations, such as in denoting nullable columns in a database tab... | <urn:uuid:631a0428-156a-467c-9f02-5b9c676374e4> | 3.359375 | 338 | Documentation | Software Dev. | 49.043373 |
Greenhouse gases in the atmosphere play a critical role in shaping the global climate, and human activities have significantly modified the concentrations of many of these gases. A key area of scientific research in understanding the effects of human activities on global climate is the identification and quantification... | <urn:uuid:7465680b-3c5b-43e2-a947-b8fdf029b567> | 3.890625 | 1,240 | Knowledge Article | Science & Tech. | 21.924955 |
Thread is one of important Class in Java and multi-threading is most widely used feature,but there is no clear way to stop Thread in Java. Earlier there was a stop method exists in Thread Class but Java deprecated that method citing some safety reason. By default a Thread stops when execution of run() method finish eit... | <urn:uuid:1e0f9f40-7f9e-4644-91c3-76e227d01034> | 3.109375 | 297 | Tutorial | Software Dev. | 40.448934 |
1. Create a map and add a shapefile to it from a location which contains spaces in the path - the layer will render correctly.
2. Leave the map open and close uDig.
3. Restart uDig - the map loads up but the shapefile layer does not render.
Here's the error log...
!ENTRY net.refractions.udig.project 1 0 2009-05-19 17:0... | <urn:uuid:df965cf5-a4ed-46c5-a7d3-0a5a8885bf77> | 2.8125 | 186 | Comment Section | Software Dev. | 83.580718 |
Cloud cover fraction
As additional service to interpret the SO2 vertical column densities,
the web pages that show images of the SO2 data also show an image
of the cloud cover fraction for the same region, taken from the same
instrument. Note that currently there is no cloud screening performed
on the data: all SO2 sla... | <urn:uuid:c56978a7-22a8-4f7f-b8b8-0728e8b774a8> | 2.90625 | 681 | Knowledge Article | Science & Tech. | 39.015134 |
Limits of Functions
Okay, we know what it is for a net to have a limit, and then we used that to define continuity in terms of nets. Continuity just says that the function’s value is exactly what it takes to preserve convergence of nets.
But what if we have a bunch of nets and no function value? Like, if there’s a hole... | <urn:uuid:41e54e71-fe9c-4b4c-8850-370c6c378249> | 3.09375 | 649 | Personal Blog | Science & Tech. | 61.546765 |
SQLite is a in-process software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. The code for SQLite is in the public domain and is thus free to use for any purpose, commercial or private.
SQLite is an embedded SQL database engine. Unlike most other SQL databa... | <urn:uuid:395e8b98-274f-48e2-81b7-ffaaf870775e> | 3.1875 | 292 | Knowledge Article | Software Dev. | 32.022538 |
Making Starbirth Easier
Outcome: A new model of star formation which uses the advances in understanding of magnetic reconnection has been tested with numerical simulations.
Transformative: The traditional paradigm of star formation based on ambipolar diffusion process faces severe problems explaining observational data... | <urn:uuid:e1054652-5e73-429a-9e67-0038e4db2dfd> | 3.28125 | 368 | Academic Writing | Science & Tech. | 20.798506 |
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.
...a linear fashion—that is, the bonds from the carbon atom to the two substituent atoms are situated at an angle that is less than 180°—in both t... | <urn:uuid:dfdcc930-7371-4714-8bf4-267f0735d05b> | 3.703125 | 466 | Truncated | Science & Tech. | 59.191864 |
"24.22 Researchers are proposing the development of a ‘‘nano- channel reactor’’ for steam reforming of methane (CH4) to fuel- cell hydrogen gas to power microscale devices. Gas phase diffusion in nanochannel A = CH4, B= H2O A+B 20 mol% CH 4 -----------------------------> Nanochannel ( NA/NB) = 0.25 300 degrees C, 0.5 a... | <urn:uuid:85e520f7-c2bc-4b48-8103-7f417e688ce9> | 2.828125 | 287 | Q&A Forum | Science & Tech. | 75.254056 |
Comparing algorithms of dissimilar performance order, such as O(nlogn) for STL sort and O(kn) for Radix-Sort, should provide insight about when one algorithm is expected to be better than another. The comparison is easier to see if the orders are put in a similar form, such as O(log2(n)*n) and O(k*n). Both formulas hav... | <urn:uuid:b424f421-cb96-470d-9aed-cb536f314523> | 3.5 | 1,606 | Knowledge Article | Software Dev. | 58.502918 |
ANSI Common Lisp 3 Evaluation and Compilation 3.2 Compilation
3.2.3 File CompilationThe function compile-file performs compilation of forms in a file following the rules specified in Section 3.2.2 Compilation Semantics, and produces an output file that can be loaded by using load.
Normally, the top level forms appearin... | <urn:uuid:d048b1d4-29e0-4e20-88df-1ac5106ce4e2> | 2.90625 | 399 | Documentation | Software Dev. | 39.51136 |
Nature provides a free lunch, but only if we control our appetites. ~William Ruckelshaus Business Week, 18 June 1990
People's choices impact ecosystems. Development is an obvious example of an impact. But there are many others.
Here are a few actions of people that impact wetlands: Runoff of lawn fertilizers & pesticid... | <urn:uuid:1a3dd8ad-32cf-42d5-9155-629f33e812dc> | 3.515625 | 1,044 | Tutorial | Science & Tech. | 34.258958 |
Biofuels, once seen as a useful way of combating climate change, could actually increase greenhouse gas emissions, say two major new studies.
And it may take tens or hundreds of years to pay back the "carbon debt" accrued by growing biofuels in the first place, say researchers. The calculations join a growing list of s... | <urn:uuid:c1d84cb1-78e9-43b6-ae79-63835411bb6c> | 3.65625 | 2,117 | Comment Section | Science & Tech. | 54.254025 |
What if the Nazis had won; Newton had abandoned science; electric motors had pre-dated steam engines; Darwin had not sailed on the Beagle; Charles II had no interest in science and a young Einstein had been ignored?
EIGHTEENTH-CENTURY scientists thought of electricity and magnetism as substances, "imponderable fluids" ... | <urn:uuid:2d68a663-8e0e-4325-b8b0-edab7d236c75> | 3.328125 | 220 | Truncated | Science & Tech. | 42.276039 |
Researchers first imagined the buckyball in 1970 and created it in the lab in 1985. But despite its relatively recent discovery here on Earth, this conglomeration of carbon is common in space. In 2010, researchers announced they detected buckyballs 6500 light-years away. Jan Cami, an astronomer at the University of Wes... | <urn:uuid:6732fc3b-295f-42d7-9b98-ac581829c118> | 3.9375 | 286 | Knowledge Article | Science & Tech. | 37.531415 |
This section describes, how to move a column in JTable component. Moving is a very simple method that moves the data from one position to the other. If you want to move a column from one position to another specified position in JTable via using the moveColumn() method, you need the index of column that will count from... | <urn:uuid:9c65bf48-0c5c-443c-ad9f-ab5974a7abc2> | 3.375 | 280 | Tutorial | Software Dev. | 51.473951 |
This image of electric blue noctilucent clouds was taken by astronaut Don Pettit while he was aboard the ISS.
Courtesy of Don Pettit and NASA TV
History of Observation of Noctilucent Clouds
Have you ever seen a noctilucent or "night-shining" cloud
? Don't worry if you haven't - they are a fairly recent "discovery" in t... | <urn:uuid:bf2ead52-d6d8-4ba3-9a42-9a7de9002123> | 3.296875 | 694 | Content Listing | Science & Tech. | 62.938541 |
What is SDL_perl?
SDL_Perl is a perl interface to the Simple DirectMedia Library. It is composed of a both a XS wrapper to the SDL libraries and a series of Perl modules that export SDL functionality in an object-oriented fashion.
One of the biggest benefits of using SDL is that it allows portable media applications to... | <urn:uuid:7fc6c549-431a-4a9e-a9be-fd9b25806f5c> | 2.6875 | 1,152 | Documentation | Software Dev. | 51.582973 |
|[Also described as new by Gerstäcker, 1862: 502.].|
|Currently subspecies of Dorylus nigricans: Emery, 1895l PDF: 710; Stitz, 1911b: 375; Santschi, 1935b: 264.|
|Material in copal: DuBois, 1998A: 137.|
Molecular Biology and Genetics
Barcode data: Dorylus molestus
There are 2 barcode sequences available from BOLD and G... | <urn:uuid:fd51c970-13a5-439b-9c3e-a3388adccc43> | 3.140625 | 599 | Knowledge Article | Science & Tech. | 46.557705 |
grade levels: 9-12
achievement standards for this lesson
Earthquakes release energy
in two different forms that travel through the earth differently, and which have
different energies associated with them. Earthquake energy is measured by an instrument
known as a seismograph which measures the back-and-forth and side-t... | <urn:uuid:90c8e57d-fe07-4d33-9f78-53ec82230f12> | 4.21875 | 836 | Tutorial | Science & Tech. | 43.044146 |
"Frankenstorm" is the most popular name for the upcoming super-storm due to hit the eastern seaboard with floods tomorrow. As Dot Earth's Andrew Revkin points out, this nickname makes it sound like the storm was created by humans and our climate-changing ways. It's also a reference to the fact that this storm is actual... | <urn:uuid:fc24f168-e287-4cd5-bb37-8cdf6e3f807f> | 2.828125 | 338 | Truncated | Science & Tech. | 54.998049 |