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ion-trap mass spectrometry
Simply begin typing or use the editing tools above to add to this article.
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It is possible to configure electric and magnetic fields so that ions can be held in stable orbits for a period of time... | <urn:uuid:c38608ed-90b1-44a3-9b2b-919533ab2c05> | 3.09375 | 150 | Truncated | Science & Tech. | 49.093202 |
|Site Home Patterns Home Table of Contents|
An application is using Messaging to transfer different types of data, such as different types of documents.
How can the application send a data item such that the receiver will know how to process it?
Use a separate Datatype Channel for each data type, so that all data on a ... | <urn:uuid:dec506d9-e156-466c-958e-68a3c7f56825> | 2.9375 | 212 | Documentation | Software Dev. | 41.715368 |
The disappearance of the Mars Observer in August and the Landsat 6 remote sensing satellite this month both emphasise the high risks of space engineering. Satellites and probes are incredibly complex structures, packed with the latest computer and telecommunications equipment, and are travelling through a hostile envir... | <urn:uuid:d8d70776-af03-4522-909b-6371b497250f> | 3.515625 | 201 | Truncated | Science & Tech. | 34.701716 |
|Mar30-12, 06:59 AM||#1|
Charged Particle Moving in Magnetic Field
An electron is accelerated through 2.4 x 105 V from rest and then enters a uniform 1.7 T magnetic field. What are the maximum and minimum values of the magnetic force this particle
QV = 0.5mv2
Basically, I've got a final value from the above equations, ... | <urn:uuid:63fa44ad-a626-4fdd-b595-7fcac5c20acb> | 2.859375 | 492 | Comment Section | Science & Tech. | 62.006895 |
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From SKYbrary Wiki
An aurora (plural: auroras or aurorae) is a natural light display in the sky, particularly in the polar regions, caused by the collision of charged particles directed by th... | <urn:uuid:4734c17e-e544-4d7e-aa06-4189933783ec> | 4.0625 | 374 | Knowledge Article | Science & Tech. | 34.103854 |
USGS project to understand coastal evolution and modern beach behavior; to identify and model the physical processes affecting coastal ocean circulation and sediment transport; and to identify sediment sources and construct a regional sediment budget.
Topics in Coastal and Marine Sciences provides background science ma... | <urn:uuid:4e7e4457-23df-4848-9f98-4832889a3f96> | 3.078125 | 259 | Content Listing | Science & Tech. | 25.290126 |
Widmanstätten pattern showing the two forms of nickel-iron minerals, kamacite and taenite
|Color||Iron black, steel gray|
|Crystal habit||Massive - uniformly indistinguishable crystals forming large masses|
|Crystal system||Isometric (4/m 3 2/m) Space Group: Fm3m|
|Fracture||Hackly - Jagged, torn surfaces, (e.g. fractu... | <urn:uuid:5f50c7f7-0dab-45a2-99c9-ae8bb5517b31> | 3.296875 | 438 | Knowledge Article | Science & Tech. | 43.979458 |
In physics and engineering, a phase vector, or phasor, is a representation of a sinusoidal function whose amplitude (A), frequency (ω), and phase (θ) are time-invariant. It is a subset of a more general concept called analytic representation. Phasors separate the dependencies on A, ω, and θ into three independent facto... | <urn:uuid:cfdbd7f6-7a0b-473c-98f0-f2b41f418fd6> | 3.78125 | 1,802 | Knowledge Article | Science & Tech. | 33.404275 |
Molecular Biology and Genetics
Statistics of barcoding coverage
|Specimen Records:||3,152||Public Records:||870|
|Specimens with Sequences:||2,192||Public Species:||135|
|Specimens with Barcodes:||1,518||Public BINs:||127|
|Species With Barcodes:||260|
Locations of barcode samples
|Wikispecies has information related t... | <urn:uuid:fd34d864-1315-428d-b791-7f47fd52801d> | 3.296875 | 400 | Knowledge Article | Science & Tech. | 22.813308 |
help, dont know why program is too slow
Okay, so I wrote my own program. ITs basically an algorithm that takes in input, does a bunch of mathematical calculations, and returns an output.
Although, it takes my computer 10 minutes to calculate the solution! I dont understand why it is taking that long to do the calculati... | <urn:uuid:4500a2ab-a02b-42e4-a06a-f68c9d44fb66> | 2.859375 | 301 | Comment Section | Software Dev. | 60.017857 |
With help from the National Science Foundation, Cornell University’s Ornithology Lab is tracking bird breeding biology and the impact of climate change on bird populations. Some of the best information they are getting is from dedicated “citizen scientists” who provide critical data on what kinds of birds are nesting w... | <urn:uuid:e1d3119f-af5f-4e9c-a31d-841f8bfb4791> | 3.15625 | 628 | Content Listing | Science & Tech. | 39.569334 |
There are four properties involving multiplication that will help make problems
easier to solve. They are the commutative, associative, multiplicative identity
and distributive properties.
Commutative property: When two numbers are multiplied together, the product
is the same regardless of the order of the multiplicand... | <urn:uuid:8aab6ddf-1922-4fe4-ae85-f7cdd1c63354> | 4.28125 | 194 | Knowledge Article | Science & Tech. | 44.506744 |
|How could part of the early universe be so cold?
No one is sure, and many astronomers now think that the
CMB Cold Spot on the
cosmic microwave background (CMB) radiation is not particularly noteworthy.
As the early universe expanded and cooled, it suddenly and predictably became transparent.
The photons that come to u... | <urn:uuid:9a8245a7-0657-4901-8b92-ccf1f961bce2> | 3.3125 | 241 | Content Listing | Science & Tech. | 38.508194 |
The 2kg spool fits loosely on the inclined rod for which the coefficient of the static friction is Mu_s= 0.2. If the spool is located 0.25m from A, determine the maximum speed the spool can have so that it does not slip up the rod.
Given Mass of spool M=2kg, Coefficient of static friction :Mu_s=0.2, d=0.25m, g=9.81m/s^... | <urn:uuid:18fde032-eee6-4643-b361-6ed4d7945763> | 2.8125 | 323 | Q&A Forum | Science & Tech. | 124.154574 |
Standing Waves (with long spring)
To demonstrate standing waves on a spring.
Have a student hold each end of the spring by the little ring. Have the students start to send waves into the spring until a single standing wave is made. After the students have accomplished one standing wave have them double their frequency ... | <urn:uuid:8432ea99-db95-4845-908c-b557fc7b3e95> | 3.765625 | 153 | Tutorial | Science & Tech. | 59.151071 |
Archaeopteryx shares characters (similarities in body shape) with certain primitive dinosaurs, such as teeth, a long bony tail, and feathers. However, Archaeopteryx possessed feathers adapted for flight on its wings and tail. The wing feather arrangement is similar to that of modern birds.
The feather arrangement sugge... | <urn:uuid:9092b070-54ce-49b9-9971-e847cc8c87b2> | 3.640625 | 140 | Knowledge Article | Science & Tech. | 28.724923 |
Despite the fact that the speed of light is an absolute upper limit, faster-than-light space travel is deeply embedded in science fiction. Einstein showed that any object with mass cannot reach, let alone exceed, the speed of light. But science fiction tends to overlook this very inconvenient truth simply because the u... | <urn:uuid:7b3426db-4c93-4132-b227-90c941502b38> | 3.75 | 855 | Personal Blog | Science & Tech. | 42.015458 |
Climate Change & Sea Level Rise
This unprecedented restoration effort, in the middle of a major urban center, will transform a landscape the size of Manhattan into a thriving wetland ecosystem— providing a critical natural buffer against the effects of global climate change and sea level rise.
The Wetland Sponge Effect... | <urn:uuid:4b55baa3-d79b-4c16-8c8f-b31aaaa442b6> | 3.859375 | 615 | Knowledge Article | Science & Tech. | 27.80061 |
Narrator: This is Science Today. Despite their prominent role in astronomy, there's still a lot about supernovae - or massive exploding stars - that's not known, including just how these stars do explode. Stan Woosley, director of the Center for Supernova Research at the University of California, Santa Cruz, says a tea... | <urn:uuid:eceeba4a-a7b6-4a85-92c9-14290bef7a25> | 3.71875 | 248 | Audio Transcript | Science & Tech. | 40.941364 |
In the constellation Cygnus
6,000 to 10,000 light-years
15 times the mass of the Sun
Diameter 55 miles (90 km), equal to the size of a large American city
Measuring the motions of gas
Because a black hole is both massive and compact, it exerts a strong gravitational pull on the material around it. Astronomers can deduc... | <urn:uuid:79bbde85-dc21-432d-83d9-e3c882e52ee7> | 4.25 | 224 | Knowledge Article | Science & Tech. | 47.621311 |
Over the next month or two, I will publish four extracts from the book Plentiful Energy — The story of the Integral Fast Reactor by Chuck Till and Yoon Chang.
Reproduced with permission of the authors, these sections describe and justify some of the key design choices that went into the making the IFR a different — and... | <urn:uuid:d6f8d865-c7d7-4ae6-be56-023e98776ac5> | 3.125 | 684 | Personal Blog | Science & Tech. | 39.30936 |
Stewart , J. R. and Dalén, L., 2008. Is the glacial refugium concept relevant for northern species? A comment on Pruett and Winker 2005. Climatic Change, 86 (1-2), pp. 19-22.
Full text not available from this repository.
Pruett and Winker (2005) recently published a phylogeographic study of the rock sandpiper (Calidris... | <urn:uuid:bcaf6640-2feb-4c1c-b877-5cbd23c63d68> | 3.09375 | 371 | Academic Writing | Science & Tech. | 48.743694 |
12th April 2012 - 11:02 PM
If you answer yes or no, provide a reason of why or how for your answer. If you'd like.
12th April 2012 - 11:23 PM
It's called classical superposition and is in Maxwell's equations.
If A is a solution to Maxwell's equations in vacuum, and B is a solution to Maxwell's equation in vacuum, then ... | <urn:uuid:c20932a6-5a21-4a61-ab33-acaf831a1dfe> | 2.890625 | 425 | Comment Section | Science & Tech. | 63.130164 |
Wednesday, June 25. 2008
The Overview Pyramid is used to visualize a complete software system in a really compact manner. Therefor it collects a set of metrics from the categories Inheritance, Coupling and Size & Complexity, and puts them into relation. The following figure shows the base structure of the Overview Pyra... | <urn:uuid:5445488a-ef7f-432f-9102-f942253409a3> | 2.828125 | 1,033 | Comment Section | Software Dev. | 40.802208 |
Tour the Math Images Project
From Math Images
Introduction to the Math Images Project
Welcome all those who enjoy interesting images, to the Math Images Project!
Our goal is to give people a new and enjoyable perspective on mathematics through beautiful and intriguing images available on the web. Topics on our site are... | <urn:uuid:5f95b4ab-90ca-480e-a8bf-95d959a51653> | 2.859375 | 1,972 | Content Listing | Science & Tech. | 46.021106 |
The Faint Young Sun
This amazing photo shows Atlantis and ISS silhouetted against the Sun.
The "Faint Young Sun" has long been a paradox. Astrophysicists have developed detailed models of the Sun's evolution. According to these models life should not have evolved on Earth, because 4 billion years ago the Sun shone with... | <urn:uuid:7755c219-9646-4d07-9118-700aafdcae32> | 3.84375 | 203 | Personal Blog | Science & Tech. | 48.337762 |
Global warming may drive about 1 quarter of land animals and plants to extinction by 2050. This is a remarkably devastating number of organisms. This means that about 1 million species will be gone, with an estimated of 10 million species in existence. Humans cause most of global warming whether they believe it or not.... | <urn:uuid:584cc666-b546-4841-be3a-0baffbe6ed59> | 3.390625 | 157 | Personal Blog | Science & Tech. | 54.562971 |
The Death Galaxy shown in this video is composed of over 2,000 hexagonal patches on a silicon wafer that are designed to allow the evolution of bacteria in a two-dimensional micro-ecology. Waves of evolutionary development start in Goldilocks regions, where conditions are just right for bacterial evolution, and then pr... | <urn:uuid:907d33a7-ef75-4ec7-9e20-05209a25bb6f> | 2.796875 | 113 | Truncated | Science & Tech. | 24.836069 |
Gender in reptiles is determined two ways: either by sex chromosomes (as with mammals) or by temperature during embryonic development. Researchers have discovered that in at least one lizard species - the Australian central bearded dragon - both modes are in play, with high temperatures trumping genes to produce female... | <urn:uuid:1cab6f3b-3d7e-480b-bc7d-ebf1e0ebe1a5> | 3.0625 | 977 | Content Listing | Science & Tech. | 50.147628 |
How the Brain Works and More
paul at phy.ucsf.edu
Wed Apr 24 20:36:01 EST 1996
Thanks very much for your post, I am very much interested in your work, please
tell me more about it. I believe we discovered some of the same principles because
knowledge has an objective structure. We can 'see' into knowledge space in
exac... | <urn:uuid:d94fac9f-ebd3-4d65-8ae2-aab76169de8c> | 3.03125 | 708 | Comment Section | Science & Tech. | 50.223212 |
What are property changes? No, it doesn’t involve moving from one apartment to another! In this BrainPOP movie, Tim and Moby will tell all about physical and chemical changes — and also give you lots of examples of these changes that we encounter every day. You’ll learn about the similarities between quick physical cha... | <urn:uuid:ff391b05-c479-4a7e-8fa6-e2ae39eafdbc> | 3.296875 | 231 | Truncated | Science & Tech. | 55.7425 |
The Ozarks are a physiographic and geologic highland region of the central United States. It covers much of the southern half of Missouri and an extensive portion of northwestern and north central Arkansas. The region also extends westward into northeastern Oklahoma and extreme southeastern Kansas. The hellbender, Nort... | <urn:uuid:54a195b1-fc68-4123-ba4a-a1ae3a160f3c> | 3.796875 | 758 | Knowledge Article | Science & Tech. | 36.480078 |
Recent Discoveries: Slimy Cave Critters
Researchers exploring a mile-deep area of a Mexican cavern called Cueva De Villa Luiz (Cave of the
Lighted House), in Tabasco state, discovered strange viscous colonies of single-cell organisms hanging
from the cave's limestone walls and ceiling. The unidentified bacteria were du... | <urn:uuid:d3ca0b95-d767-432a-bea6-9608c593ccef> | 3.109375 | 169 | Knowledge Article | Science & Tech. | 29.161622 |
Sand dunes on the Newnes Plateau (1000 m a.s.l.), west of Sydney, were active during the Last Glacial Maximum. The scattered sand dunes are forested under the modern humid, temperate climate regime. Dune types range from parabolic to transverse lee dunes and sand sheets or patches. All point to the presence of conditio... | <urn:uuid:9aa0aae9-c146-43dc-a093-480518b1359d> | 3.3125 | 212 | Knowledge Article | Science & Tech. | 26.256955 |
Have your parents ever found you munching on candy and asked you, "How much candy did you eat?" Instead of saying, "I do not know?" and getting in trouble, maybe you would rather say, "I ate precisely 10.7 cubic milliliters of candy, Mom." Make your parents proud of their candy-eating genius child (you) with this simpl... | <urn:uuid:310bbdce-1194-4f43-8c4e-6f7b0cdfa181> | 4.25 | 3,253 | Tutorial | Science & Tech. | 63.662193 |
03-24-12, 08:52 AM #21
One is reminded here of the problem of protein folding. As I have pointed out elsewhere (Watterson, 1997), that problem also arises from applying classical theories, since they predict an average, not a unique fold. That these questions remain unsolved still today after 50 years of intense resear... | <urn:uuid:6d7eecb9-6470-489d-a757-d1ad7a717765> | 2.921875 | 440 | Comment Section | Science & Tech. | 52.727852 |
mainmethod does is declare and initialize some variables. Here is the relevant section of code:
double tolerance = .000000001; // Our approximation of zero int max_count = 200; // Maximum number of Newton's method iterations /* x is our current guess. If no command line guess is given, we take 0 as our starting point. ... | <urn:uuid:b4052431-1a6d-43da-9592-2fb021641bc8> | 4.09375 | 492 | Documentation | Software Dev. | 46.042722 |
DNA is usually a double-helix and has two strands running in opposite directions. (There are some examples of viral DNA which are single-stranded). Each chain is a polymer of subunits called nucleotides (hence the name polynucleotide).
Each strand has a backbone made up of (deoxy-ribose) sugar molecules linked together... | <urn:uuid:cb6aa10a-b1ed-4b78-af22-1d239170008a> | 4.375 | 2,721 | Academic Writing | Science & Tech. | 42.304975 |
Coral reefs are the most biologically diverse of shallow water marine ecosystems but are being degraded worldwide by human activities and climate warming. Analyses of the geographic ranges of 3235 species of reef fish, corals, snails, and lobsters revealed that between 7.2 and 53.6 of each taxon have highly restricted ... | <urn:uuid:8a0c1c13-3107-4c0d-ae49-4b057db06a63> | 3.890625 | 1,093 | Content Listing | Science & Tech. | 21.728779 |
Hollywood has had its crack at the Red Planet with Civil War veterans, flying saucers and The Governator, now it’s NASA’s turn to tackle Mars and a communications challenge that dwarfs the just-completed “Twitter Olympics.” This takes Big Data to a whole new level.
Launched last November 26, the Mars Science Laboratory... | <urn:uuid:05604cd2-69dd-4060-bb53-54bdeaa02ed5> | 3.09375 | 607 | Personal Blog | Science & Tech. | 43.971172 |
Opera Dragonfly Architecture
This article covers the architecture of Opera Dragonfly in detail, showing what the different components in the architecture are, and how they interact during Dragonfly's running.
- Architecture overview
- Debugging scenarios
The architecture of Opera Dragonfly, Opera Software’s development... | <urn:uuid:ca89ee05-d7c6-45f2-88ea-9f22d1f8f3a6> | 2.890625 | 962 | Documentation | Software Dev. | 37.365684 |
Here are some major features:
- Create a network topology that contains switches (nodes) and computers (end-points) by a user-friendly graphical interface.
- The topology can be saved to disk to later usage.
- Specify the connection metric between nodes. The metric could be in uni-direction or bi-direction.
- Able to s... | <urn:uuid:6c33598e-197f-4de4-8a63-fd3dbd26e1be> | 2.96875 | 1,132 | Documentation | Software Dev. | 22.26483 |
(J. P. Müller and Henle, 1839)
|Range of bull shark|
The bull shark, Carcharhinus leucas, also known as the Zambezi shark (UK: Zambesi shark) or unofficially Zambi in Africa and Nicaragua shark in Nicaragua, is a shark commonly found worldwide in warm, shallow waters along coasts and in rivers. The bull shark is known ... | <urn:uuid:32c289e1-6df6-4e39-951b-5923ce93abef> | 3.625 | 3,464 | Knowledge Article | Science & Tech. | 61.271681 |
The resulting layer was filtered to remove any patches of less than 4 pixels in size, and to fill in any holes of 4 pixels or less. Water was removed, unless it was completely surrounded by other natural land cover. A 30 meter buffer of the roads was also removed. Any patches in the resulting data layer that were less ... | <urn:uuid:dff856bf-1e5e-482b-a920-729faf91b8c6> | 3.578125 | 845 | Knowledge Article | Science & Tech. | 42.666346 |
Seeing Deeper: The Webb Space Telescope
The James Webb Space Telescope is NASA's next orbiting observatory and the successor to the Hubble Space Telescope. A tennis court-sized telescope orbiting far beyond Earth's moon, Webb will detect infrared radiation and be capable of seeing in that wavelength as well as Hubble s... | <urn:uuid:d855927d-edcd-49a5-a08f-10e9295951c3> | 3.859375 | 270 | Knowledge Article | Science & Tech. | 28.002237 |
Pub. date: 2008 | Online Pub. Date: April 25, 2008 | DOI: 10.4135/9781412963893 | Print ISBN: 9781412958783 | Online ISBN: 9781412963893| Publisher:SAGE Publications, Inc.About this encyclopedia
Center for Science and Environment (India)
Velma I. Grover
THE CENTER FOR Science and Environment (CSE) was established in 19... | <urn:uuid:429a7b01-459f-4a3b-8304-a97ae6d346aa> | 2.96875 | 260 | Content Listing | Science & Tech. | 37.212692 |
The infrared properties of the GPS and CSS sources can in principle shed light on the properties of the central engine and its immediate environment. Consider the expected mid-far-infrared (MFIR) properties of GPS/CSS sources compared to those of a sample of classical double radio sources with the same extended radio p... | <urn:uuid:09721b9f-40eb-4fcb-800f-371104046893> | 2.8125 | 1,282 | Academic Writing | Science & Tech. | 78.984363 |
#2 Decoding mental illness. Disorders such as schizophrenia, depression, and bipolar disorder often run in families, but researchers have only begun to unravel how genes can nudge someone into mental illness. This year, progress was made on several fronts.
Antidepressant drugs work by targeting a receptor important for... | <urn:uuid:ea699bd1-01f5-40c3-9530-f3998c2723e0> | 3.265625 | 1,689 | Content Listing | Science & Tech. | 41.228889 |
I'm reading about color vision and have some trouble understanding the motivation for why the trichromatic theory was suggested in the first place. The book I'm reading ("Psychgology: The science of mind and behavior") states:
At the beginning of the nineteenth century it was discovered that any colour in the visible s... | <urn:uuid:3aea84dc-91f0-4a09-a081-13fb259fbd61> | 3.140625 | 187 | Q&A Forum | Science & Tech. | 35.251615 |
Daniel and I have just been speaking to Thomas Ormston, Spacecraft Operations Engineer, and contributor to this blog. We wanted the definitive answer on why the Mars Express camera (HRSC) would not be taking images at closest approach. It turns out that there are three reasons – each of them alone would be show stopper... | <urn:uuid:8c1df5ba-55ee-4c29-90a8-ad254351c7bb> | 3.234375 | 487 | Personal Blog | Science & Tech. | 59.567484 |
Back in 1981 Eric Drexler proposed that the molecular machinery found in living cells demonstrated the feasibility of producing artificial molecular machinery, and that further, it would be easier to engineer proteins from scratch to fold in ways useful for engineering molecular machinery than to fully understand the s... | <urn:uuid:7631a87e-7de0-4cde-b5e2-ab4e32d5e301> | 3.953125 | 716 | Knowledge Article | Science & Tech. | 25.712478 |
name is a symbol or string to look up or to create as a foreign symbol. If it is a symbol, the symbol looked for is that which the function lisp-name-to-foreign-name would produce. If name is a string, it is taken literally
If supplied and the symbol is not already defined as a foreign symbol, force forces it to be an ... | <urn:uuid:d780dd8e-6302-4c24-97af-38454fd63dc2> | 3.078125 | 170 | Documentation | Software Dev. | 45.785164 |
Regular Pentagon and Center
Make a regular pentagon of any size, and a node at the exact center. You may use any manner of connecting struts.
K4 (four connected nodes)
See http://www.zometool.com/manual/tetra/tetrachart.gif for a complete list.
K5 (five connected nodes)
Three B1, Three Y1, One Y2, and Three R1.
Two B1,... | <urn:uuid:60724a01-caa2-4680-98a9-3a001b56d867> | 2.984375 | 634 | Tutorial | Science & Tech. | 93.656911 |
Dieter Helm's excellent article was spoilt by insertion of illustration which implied risk of severe floods due to global warming (Who should pay for global warming?', 3 November). Much concern exist at the possiblility of such floods. The same issue (In Brief) also contained a report that the Dutch government is consi... | <urn:uuid:46718874-4965-4c6d-bdbc-4788c2a92504> | 3.28125 | 205 | Truncated | Science & Tech. | 48.525951 |
by Staff Writers
Jeju, South Korea (AFP) Sept 9, 2012
An unlikely and unique cradle of biodiversity that runs the length of the world's most heavily-militarised border is being threatened by encroaching development, conservation experts say.
Once described by former US president Bill Clinton as "the scariest place on E... | <urn:uuid:9a04fab4-0eef-41c3-b1d3-2f831f355251> | 3.015625 | 1,142 | Truncated | Science & Tech. | 32.724837 |
Synthetic Trees and Carbon Dioxide
Earth is considered to be millions of years old. Humans, as major living creatures are harming Earth with different types of pollution and industrial production. The Earth’s temperature is rising from climate change. We could argue about whether it is a short term or long term trend, ... | <urn:uuid:8ce45d28-1b28-41a6-a9de-198ec14e0d4b> | 3.625 | 982 | Personal Blog | Science & Tech. | 50.443284 |
Thursday, October 11, 2012
Carbon dioxide is not the only problem we must address if we are to understand and solve the problem of climate change. According to research published this month in the International Journal of Global Warming, we as yet do not understand adequately the role played by aerosols, clouds and the... | <urn:uuid:ffecf443-51c3-4cad-8862-e6f0d69e4739> | 3.71875 | 646 | Truncated | Science & Tech. | 24.068032 |
Boost License 1.0. Authors:
Walter Bright, Andrei Alexandrescu Source:
- int system(string command);
- Execute command in a command shell.
If command is null, returns nonzero if the command interpreter is found, and zero otherwise. If command is not null, returns -1 on error, or the exit status of command (which may in... | <urn:uuid:fd4f9a03-84ef-4242-9b45-91a7a3b4c6db> | 2.953125 | 610 | Documentation | Software Dev. | 54.266038 |
Scientists have just announced an historic discovery on a par with the splitting of the atom: the Higgs boson, the key to understanding why mass exists has been found. In The Particle at the End of the Universe, Caltech physicist and acclaimed writer Sean Carroll takes readers behind the scenes of the Large Hadron Coll... | <urn:uuid:122544b6-4474-411a-9ef1-a4a2638d27b2> | 2.859375 | 1,046 | Personal Blog | Science & Tech. | 45.112659 |
Imagine you want to save the state of one or more objects. For example an Object User you'd have to use one of the I/O classes to write out the state of the instance variables of all the objects you want to save. The worst part would be trying to reconstruct new objects that were virtually identical to the objects you ... | <urn:uuid:da56bbbb-031f-49db-a1f0-7bca615e3aba> | 3.265625 | 1,444 | Personal Blog | Software Dev. | 44.78713 |
Bull Sharks, Carcharhinus leucas
Taxonomy Animalia Chordata Elasmobranchii Carcharhiniformes Carcharhinidae Carcharhinus leucas
Description & Behavior
Bull sharks, Carcharhinus leucas (Müller and Henle, 1839), aka zambezi, ganges (often confused with the Ganges river shark, Glyphis gangeticus), ground sharks, river sha... | <urn:uuid:2bae7de5-f487-43ff-b00a-87ae17189262> | 3.59375 | 1,682 | Knowledge Article | Science & Tech. | 43.986182 |
k is the center of tangent circle so what is the angle of A.
Can I assume that when you say "tangent circle" you mean that I could use a compass to draw a circle centered at point K that would touch all three "corners" of the triangle? If so, then what you've got is an equilateral triangle, which has all three sides th... | <urn:uuid:f68db58d-457e-4839-b79a-a2787b2dd8fa> | 2.71875 | 131 | Q&A Forum | Science & Tech. | 68.196667 |
Frequently Asked Questions
How do you find the area of a circle?
The diagram below demonstrates that the area of a circle must be less that 4r².
However, it is possible to find the area of a circle by a clever method of dissection. The method is the beginning of the calculus and is attributed to the work of Democritus ... | <urn:uuid:a88a5282-5135-40f1-90b8-ee8a6a62819a> | 4.3125 | 496 | Q&A Forum | Science & Tech. | 52.95109 |
Douglas-fir water "take up"
How much ground water does a full-grown Douglas-fir (Pseudotsuga
menziesii) "take up" per day? If there is no information on
the Douglas-fir, any large conifer will do.
In Irwin P. Ting's "Plant Physiology" of a
47-ft. maple tree with 177,000 leaves and total leaf surface area of
675 sq. met... | <urn:uuid:e584a1bd-9343-4762-92cc-bec68e8a6e43> | 2.921875 | 213 | Knowledge Article | Science & Tech. | 77.752575 |
As we have noted, Ampere's law must be modified in the presence of time dependent currents, because otherwise we would have
By considering what happens when (say alternating) current is passed through a circuit with a gap, Maxwell realized that consistency requires that there must be something that contributes to the c... | <urn:uuid:07aa3d35-5a06-4cbd-afab-b7753e407ee0> | 4.25 | 500 | Academic Writing | Science & Tech. | 38.312444 |
Here, in this section, you will find the lower and upper indices of the matching group of the text through the regular expression in Java. This section explains some method or APIs which have been used in the following program.
This method counts the matched string or text of the given group of the text or string.
Abov... | <urn:uuid:1b2878c8-9c20-41ad-b3b9-4169b1e54f7f> | 2.96875 | 161 | Documentation | Software Dev. | 61.745625 |
Solution Growth of a New Quasicrystal
Recently, only the second binary icosahedral quasicrystal ever has been discovered, ten years after the first. A particular scandium‑zinc alloy (Sc12Zn88) was created via a traditional solution‑growth method. Sc12Zn88 consists of millimeter-sized, facetted, single grain quasicrysta... | <urn:uuid:8d760f77-cdba-47bd-8b6b-458254dac670> | 2.9375 | 396 | Knowledge Article | Science & Tech. | 39.16035 |
It is very likely, that people will need to adapt to climate change fast. Depends upon the effects caused by climate changes, people might need to learn what various green technologies can offer to make adaptation process easier, more efficient and less expensive. The questions are:
1. Which of the green technologies c... | <urn:uuid:4ba2845e-bd2c-4967-9000-f0b7de2e012f> | 2.78125 | 122 | Q&A Forum | Science & Tech. | 50.184608 |
Imagine the Earth in its place in the Milky Way. You are standing on the Earth looking out into space. The night sky arcs over the planet. You are in awe of the vastness of space. You try to identify the constellations, and then you wonder, "Where are all those stars located? How far are they from me?"
The Milky Way
Su... | <urn:uuid:bd34db9a-e4ae-44c1-88a2-bf045349fc60> | 3.75 | 319 | Knowledge Article | Science & Tech. | 69.797698 |
The Battery & Electromagnetism The key technologies in our story.
The Battery & Electromagnetism
⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles.
- Consider the following experiment.
- You have two pie... | <urn:uuid:3353c660-9061-4efd-8e48-5ac50a0838c6> | 3.671875 | 1,679 | Truncated | Science & Tech. | 53.046562 |
Traditionally , hydrocarbons were derived from a raw material called coal
tar . Coal tar is a thick black liquid obtained by the destructive
distillation of bituminous coal in coke oven or retort to give such
important products such as benzene , discovered by Michael Faraday ,
phenol , naphthalene and creosote . As the... | <urn:uuid:2d722401-2369-4a69-9615-428139300184> | 3.625 | 93 | Content Listing | Science & Tech. | 28.275 |
Mohapatra, S. K. and Misra, M. and Mahajan, V. K. and Raja, K. S. (2007) A novel method for the synthesis of titania nanotubes using sonoelectrochemical method and its application for photoelectrochemical splitting of water. JOURNAL OF CATALYSIS, 246 (2). pp. 362-369.
Full text is not hosted in this archive but may be ... | <urn:uuid:8d90b85c-0ef4-4214-a573-84d05ec1dce5> | 2.734375 | 561 | Academic Writing | Science & Tech. | 48.123323 |
Is that a bottlenose I hear? Software that identifies different dolphin species by their whistles could improve the accuracy of surveys that monitor possible harm from fishing fleets.
These surveys are now performed by observing the animals from a boat. A fall in the number of sightings of a particular species is taken... | <urn:uuid:d8ad69e5-57f7-46de-9cde-6b65856e87ab> | 3.609375 | 398 | Truncated | Science & Tech. | 47.581858 |
To measure the amount of water stored in the pore space of a soil sample.
dry soil sample or sand
two 500 ml beakers
Soils are made of particles of different types and sizes. The space between particles is called pore space. Pore space determines the amount of water that a given volume of soil can hold. Porosity is the... | <urn:uuid:7a253140-1575-449f-a1d6-7677d4816bd0> | 3.828125 | 164 | Tutorial | Science & Tech. | 45.596667 |
column values within a table
A very common coding request is
the desire to count the number of distinct values in a low cardinality
For example, a motor vehicle database may need to know the number of
blue cars in Ohio.
These queries are easily solved by using the Oracle decode built-in
In the code below, we see that w... | <urn:uuid:12eeff11-8536-47fb-8ec0-36347e11d952> | 2.796875 | 205 | Tutorial | Software Dev. | 61.635735 |
Apr. 18, 2009 Scorpions possess resistance to high temperatures and the ability to conserve water for long periods of time, and as a result thrive in hot and arid parts of the world. But is this global distribution also seen at a more local level?
Doctoral student Shmuel Raz and colleagues at the University of Haifa, I... | <urn:uuid:25caf01c-8add-4a61-a58a-24864c0a0833> | 3.921875 | 521 | Truncated | Science & Tech. | 37.521442 |
CAPT Michael Alfultis (Ret), University of Connecticut at Avery Point
"Oceanographic Implications of the Sea of Okhotsk Ice Cover"
Abstract: The Sea of Okhotsk is a mediterranean sea in the northwest Pacific Ocean, bounded by the Kamchatka Peninsula to the east and the Asian continent to the north and west. Although it... | <urn:uuid:093c527b-0af9-4b49-a0f2-159796bcb7a6> | 2.71875 | 295 | Academic Writing | Science & Tech. | 25.741576 |
Chromatic dispersion is a lighting reflection technique used to make a texture truly look metallic by scattering raytraced light just as shiny metal would do. It is naturally a fairly processor intensive task, but creates mirror-effect textures that naturally distort reflections to the shape of the object.
Below, we of... | <urn:uuid:7abc4244-90f6-4432-972c-ecf2e9a20aae> | 3.21875 | 359 | Content Listing | Science & Tech. | 27.300616 |
A new paper in Nature shows that the social structure of fire ant colonies is determined by a ‘supergene’ – a single non-recombining cluster of hundreds of genes. The supergene makes up more than 50% of a pair of divergent chromosomes. The social chromosomes appear to have emerged in a similar manner by which sex chrom... | <urn:uuid:e9f159fa-e906-42d9-9b54-fbee73d38578> | 3 | 1,359 | Knowledge Article | Science & Tech. | 29.881793 |
Quick! Name a small and numerous component in the brain that allows us to think.
If you said “neuron,” you would be only partially correct. According to Carl Zimmer’s blog at Discover, “The Loom,” evidence is accumulating that thinking is also accomplished by astrocytes
—named for their starlike rays, which reach out i... | <urn:uuid:cc9412b1-a0d3-4296-9dee-33491e3e28b2> | 3.734375 | 465 | Personal Blog | Science & Tech. | 51.484497 |
The Miniature Radio-Frequency instrument (Mini-RF) is a synthetic aperture radar (SAR) instrument on the Lunar Reconnaissance Orbiter (LRO), which is currently in orbit around the Moon. It has a resolution of 30 m/pixel and two wavelength bands, a primary band at 12.6 cm and a secondary band at 4.2 cm. The original pri... | <urn:uuid:19d7b8eb-7a4e-49ee-954e-9d72cb34eff9> | 3.296875 | 535 | Knowledge Article | Science & Tech. | 53.342385 |
December 12, 1935 at Stockholm Concert Hall, Stockholm, Sweden.
It is a great honour and a great pleasure to us that the Swedish Academy of Sciences has awarded us the Nobel Prize for our work on the synthesis of radio-elements, after having presented it to Pierre and Marie Curie in 1903, and to Marie Curie in 1911, fo... | <urn:uuid:4e8554d4-b815-4aca-a55d-d5e9f6093a6c> | 2.90625 | 1,386 | Audio Transcript | Science & Tech. | 20.505246 |
You can ask students to find the number of degrees in angle A of triangle ABC if angle B equals 72 degrees and angle C is 34 degrees, and that is a reasonable and acceptable math problem.
But if you ask a student to find the number of degrees between the hands of a clock at 4:08, then this is more interesting math prob... | <urn:uuid:61a777d6-8085-4dbb-b114-018ec82c70e7> | 3.5625 | 2,166 | Tutorial | Science & Tech. | 68.436585 |
GPS and disaster-prediction
Monday, December 19, 2005 8:46:22 PM
GPS Could Speed Tsunami Warnings and in addition GPS modules could be used to monitor the activity of volcanoes and landslides in real time. Findings in this direction were presented at the American Geophysical Union conference in San Francisco 5–9 Decemb... | <urn:uuid:2ae120d2-6572-4cd2-a6b3-19a1806741c7> | 2.8125 | 142 | Personal Blog | Science & Tech. | 36.277123 |
tee - duplicate standard input
The tee utility shall copy standard input to standard output, making a copy in zero or more files. The tee utility shall not buffer output.
If the -a option is not specified, output files shall be written (see File Read, Write, and Creation.
The tee utility shall conform to the Base Defin... | <urn:uuid:2bf56513-1b8e-4db7-ac95-03592e7a1e87> | 2.796875 | 792 | Documentation | Software Dev. | 43.701003 |
Illustration © Pieter Folkens
Read Arctic Science Journeys Radio stories and listen to audio:
Distribution/Migration: North Pacific. Breed and winter in Mexico and migrate north through coastal waters (passing through Unimak Pass) to summer feeding grounds in the Gulf of Alaska and Bering, Chukchi, and Beaufort seas. R... | <urn:uuid:352ee1af-396c-48a5-ae96-4fd3c4b288a7> | 3.5 | 545 | Knowledge Article | Science & Tech. | 61.474429 |
|Browse archived CSI's:|
No, that's not a cover of a 70s-era psychedelic rock album. But if you were thinking "Dark Side of the Mushroom," you're closer than you think. This is a dark photo of a bioluminescent bunch of Mycena lucentipes mushrooms. They're an especially radiant species of the 65 different mushroom varie... | <urn:uuid:abe579e9-4c9c-4781-ac5e-871145116086> | 2.859375 | 278 | Knowledge Article | Science & Tech. | 54.615 |
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.
characteristics of Sturnidae
...with metallic sheen. Some are crested or display wattles or bare patches of skin. They chatter continually while i... | <urn:uuid:b05b583d-087e-41e7-960f-d4fc45ee7a39> | 3.28125 | 698 | Truncated | Science & Tech. | 46.93766 |
Hai. I am a beginner in Java. Is there any difference between a variable and a data member? If so what are the differences?
Joined: Mar 18, 2004
What is "Data Member"? Are you talking about the Attribute of a class?
These are different Variable can be of Class Level or Method level but Attribute of a class is class lev... | <urn:uuid:f75cd7cc-118f-4a8c-bb06-711e711f268b> | 2.8125 | 213 | Q&A Forum | Software Dev. | 58.082069 |
Objects (NEOs) are comets and asteroids that have been
nudged by the gravitational attraction of nearby planets into
orbits that allow them to enter the Earth's neighborhood. Composed
mostly of water ice with embedded dust particles, comets
originally formed in the cold outer planetary system while most of
the rocky as... | <urn:uuid:80424069-88f0-4201-8887-178122ee7958> | 3.921875 | 2,631 | Knowledge Article | Science & Tech. | 46.194358 |
CNN: What is the main goal of your research program?
Kalirai: The main goal of my research is to understand the details of how stars like our sun, including those that are a little more and a little less massive, change over time. For billions of years, these stars will remain at the same brightness and temperature. Th... | <urn:uuid:c938c281-8a5d-4fa6-a620-30aba41db45c> | 3.8125 | 583 | Audio Transcript | Science & Tech. | 57.677759 |
Determining Deformation in Bouncing Balls
I am conducting an experiment for my physics class in
which I plan to compare how bouncy various balls are by measuring
and comparing how much they deform when dropped from a constant
height. Originally I planned to place a piece of carbon paper over
notebook paper on a hard su... | <urn:uuid:44b48b5f-1ba8-416a-b3ad-1aeeed3a23de> | 3.1875 | 1,732 | Q&A Forum | Science & Tech. | 55.712393 |
Electricity: Electric Circuits
Electric Circuits: Audio Guided Solution
A 4.5-volt series circuit consists of two resistors. Resistor A has three times the resistance as resistor B. An ammeter records a current of 160 mA of current. Determine the resistance values of resistors A and B.
Audio Guided Solution
Click to sh... | <urn:uuid:e79d064d-624c-473c-a824-11f95e07686c> | 3.765625 | 286 | Tutorial | Science & Tech. | 58.039017 |
The spacecraft's payload includes spectrometers to study the elemental composition of the surface, a magnetometer to measure the planet's magnetic field and an altimeter to sense its surface topography. But for now it's the wide- and narrow-angle cameras on the Mercury Dual Imaging Systemcapable of taking global color ... | <urn:uuid:cae6d649-f7e5-4ed5-8644-545a2b338987> | 3.25 | 223 | Truncated | Science & Tech. | 26.119725 |
What was accomplished over the course of the last twelve months and what does the next year have in store? Part of this assessment often entails reflecting on the mistakes of the past, things that nobody wants to repeat in the upcoming future. And at the same time, the hope is to repeat those things that turned out rig... | <urn:uuid:df199d9d-830a-460f-ae65-c9c3c1f66b22> | 2.953125 | 347 | Personal Blog | Science & Tech. | 23.716284 |
Wow, just happened upon this thread. Like most of you, I'm no physicist, heck I can barely spell it.
That said, I do have some ideas that if the Higgs-Boson is confirmed, and the Higgs field is found, and it does what it is theorized to do, could be relative.
So, if the Higgs field gives everything mass, and something ... | <urn:uuid:109a5a3b-14d9-4af9-af86-81c4f7e57d15> | 2.953125 | 691 | Comment Section | Science & Tech. | 59.940233 |
[Previous] | [Session 6] | [Next]
H. Wang, M. I. Richardson, A. P. Ingersoll (Caltech), R. J. Wilson (GFDL), R. W. Zurek (JPL)
The Martian dust storm provides one of the most spectacular examples of transient meteorological phenomena in the solar system. While most Martian dust lifting events are local in scale, tens t... | <urn:uuid:c5206b29-6c74-47a2-8f22-05b954e72477> | 3.1875 | 508 | Academic Writing | Science & Tech. | 35.635224 |
Comets, thought to be leftovers of the early solar system, are made of dust, rocks, organic compounds, and ice.
Composition: Astronomer Fred Whipple created the term "dirty snowballs" as a description of comets. These bodies are made of dust, rocks, organic compounds, and ice. Ice, in the form of dry ice, water ice, an... | <urn:uuid:4738760a-fb96-4756-ba2e-61c7d4cdc14c> | 4.28125 | 399 | Knowledge Article | Science & Tech. | 50.426891 |
Mary, Mary, quite contrary, how does your nanogarden grow?
Harvard engineer Wim Noorduin has a green thumb. Only his thumb is only a few microns wide. By carefully controlling gradients of chemicals, he guided the construction of flower-like crystal structures to match their larger biological forms. It’s certainly art,... | <urn:uuid:b8a94b9b-5032-4f3b-8391-ee942f84348c> | 2.84375 | 208 | Personal Blog | Science & Tech. | 43.191062 |
Definition: The PHP Hypertext Preprocessor (PHP -- yes, the first "P" in the acronym does indeed stand for PHP!) allows web developers to create dynamic content that interacts with databases. PHP applications are normally found on Linux servers and in conjunction with MySQL databases. It provides those servers with fun... | <urn:uuid:2dc8531f-a1ad-41f1-8ba5-730bd81eac10> | 3.109375 | 85 | Knowledge Article | Software Dev. | 31.577059 |