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What is the concept behind when it is said that for the first fundamental f=c/λ , λ should be equal to 2L . I have read the page http://en.wikipedia.org/wiki/Fundamental_frequency but I am still confused about why 2L ?
The image above (shamelessly cribbed from Google images!) shows various features of a sine wave. The ... | <urn:uuid:680f952c-bedb-4358-ad96-6d27b3cc2187> | 3.890625 | 481 | Q&A Forum | Science & Tech. | 67.818158 |
A composite of all the major global temperature records via Skeptical Science.
The last decade was easily the hottest on record. We’ve known that sulfate aerosols (from volcanoes and/or Chinese coal) and the “the deepest solar minimum in nearly a century” masked the rate of warming somewhat.
Even so, NASA’s Goddard Ins... | <urn:uuid:aec57c9c-d133-416b-bd0e-095976473830> | 3.640625 | 483 | Knowledge Article | Science & Tech. | 47.396367 |
How the Owl Tracks Its Prey
Experiments with trained barn owls reveal how their acute sense of hearing enables them to catch prey in the dark
The structure of owls' ears enable them to rapidly spatially locate the origin of sounds that are literally as quiet as a mouse. Author Masakazu Konishi describes clever and eleg... | <urn:uuid:d3744212-2c94-4ab2-b850-886ce0d1632a> | 3.75 | 148 | Truncated | Science & Tech. | 21.684712 |
The team used the device to capture a single cell of a “candidate division” called OP11 from an anaerobic sulfide and sulfur-rich spring in southwestern Oklahoma called Zodletone Spring. There was nothing particularly special about OP11 a priori, Blainey says, because nothing was known about it; the organism was sequen... | <urn:uuid:6141f229-84fd-4a51-8d12-7c6d7b2bb1bf> | 2.984375 | 1,255 | Academic Writing | Science & Tech. | 33.242281 |
limitArticle Free Pass
limit, mathematical concept based on the idea of closeness, used primarily to assign values to certain functions at points where no values are defined, in such a way as to be consistent with nearby values. For example, the function (x2 − 1)/(x − 1) is not defined when x is 1, because division by ... | <urn:uuid:257cc7a5-9f40-44da-b0a0-f541e4c74fff> | 4.3125 | 485 | Knowledge Article | Science & Tech. | 59.121237 |
The general form of a quadratic equation is where a, b, c are constants (generally integers).
A quadratic equation with real coefficients can have none, one or two distinct real roots.
To find them, use the Quadratic Formula:
or factorise it.
We require to numbers that multiply together to give 8 and add together to gi... | <urn:uuid:e37af162-6227-4983-bac9-4f1edaf2adc7> | 3.046875 | 88 | Tutorial | Science & Tech. | 57.689875 |
Zermelo Fraenkel set theory ZFC
Zermelo Fraenkel set theory
The standard set theory in which most mathematics is formalized. Its axioms include the pairing axiom, the power set axiom, the axiom of infinity, the axiom of extensionality, the axiom of replacement, the separation axiom, the union axiom, and the foundation ... | <urn:uuid:81d54854-1534-4f65-acdd-05e6fc119aec> | 2.890625 | 203 | Knowledge Article | Science & Tech. | 54.492596 |
Explanation Of Orbital Elements
The quantities given in orbital elements published in the
Minor Planet Circulars
Minor Planet Electronic Circulars
have the following meanings (for a detailed explanation of the physical
meaning of these quantities, and on any relationships between different
quantities, you are referred ... | <urn:uuid:8afc2c9d-9340-4fa8-bf6a-8d9951ee74cc> | 3.234375 | 392 | Tutorial | Science & Tech. | 38.142501 |
Joined: 16 Mar 2004
|Posted: Tue Aug 19, 2008 12:08 pm Post subject: Nanopositioning breaks new record
|Nanopositioning breaks new record
One of the main obstacles facing nanotechnology today is the lack of effective devices for building and characterizing nanoscale structures. For the field to progress, scientists nee... | <urn:uuid:09a251fa-750d-41ae-a70d-397a50c04da0> | 3.046875 | 506 | Comment Section | Science & Tech. | 26.126683 |
Amphibians are integral links in the flow of energy in natural ecosystems. They are predators of many animals, some of which are pests, and they are prey for other animals in the food web. Amphibians are declining worldwide. The primary cause is habitat loss, but commercialization for food and skins, disease, introduce... | <urn:uuid:569ae0e9-25f1-44ff-81b2-59f28c2c4ccb> | 3.5625 | 177 | Knowledge Article | Science & Tech. | 31.309063 |
A telescope to peer deep into the heart of our planet
Designed to track North America’s geological evolution, EarthScope is the largest science project on the planet. This earth-sciences observatory records data over 3.8 million square miles. Since 2003, its more than 4,000 instruments have amassed 67 terabytes of data... | <urn:uuid:0d128747-dbeb-4805-83ab-3ed14c30ce24> | 4.03125 | 359 | Truncated | Science & Tech. | 45.391109 |
They give birth astride a grave, the light gleams an instant, then it's night once more.
The supernova that was spotted in the Large Magellanic Cloud in 1987 reached 3rd magnitude and was the brightest to grace our skies in 383 years.
Courtesy David Malin, Ray Sharples, and the Anglo-Australian Observatory.
Samuel Beck... | <urn:uuid:7bd4f737-ea06-4859-942f-7d418e38e27e> | 3.265625 | 1,017 | Knowledge Article | Science & Tech. | 50.972495 |
Dimples on Golf Balls
A boundary layer is the layer of fluid (gas or liquid) next to a moving surface (wall) where the fluid transitions from zero velocity at the wall to the free stream velocity away from the wall. By inducing a turbulent boundary layer at an otherwise laminar boundary layer speed (determined by the R... | <urn:uuid:d5902793-630e-4786-9cd8-382b399b818a> | 3.171875 | 401 | Personal Blog | Science & Tech. | 41.825324 |
Documentation and Resources
The Clojure website contains many articles, most of which are listed on their Documentation page. There’s also has a great cheatsheet there (which includes a link at the bottom to enhanced cheatsheets with tooltips).
The clojure-doc.org site contains a number of tutorials and other guides.
T... | <urn:uuid:4536e475-3ba8-42f5-8a43-3c3c5d6ad6b7> | 2.828125 | 625 | Content Listing | Software Dev. | 58.274253 |
Binary stars play a very significant role in astrophysics: the only way you can directly obtain the mass and size of a star is if you can observe it orbiting with another star - then Kepler's laws of orbital motion and Newton's laws of gravitation can be applied. When they eclipse, occult or transit one another, we can... | <urn:uuid:703be652-8338-4254-ad0f-aa663e708508> | 4.03125 | 1,585 | Knowledge Article | Science & Tech. | 50.948718 |
Scientific name: Jordanita globulariae
June - July. Wiltshire, Gloucestershire, Hampshire, Sussex and Kent. Small shiny green moth found on chalk downland and often on flowers like knapweed. Similar to Forester and Cistus Forester.
One of three similar species, this iridescent green moth can be difficult to distinguish... | <urn:uuid:223eec67-0bac-4531-bd9e-667e093c41b9> | 3.1875 | 325 | Knowledge Article | Science & Tech. | 35.194696 |
8.2.1 REPL commands
- M-x slime-repl-return
Evaluate the current input in Lisp if it is complete. If incomplete,
open a new line and indent. If a prefix argument is given then the
input is evaluated without checking for completeness.
- M-x slime-repl-closing-return
Close any unmatched parenthesis and then evaluate the ... | <urn:uuid:ca3c33cf-42ba-4afa-ba7c-b7e37d554733> | 2.6875 | 261 | Documentation | Software Dev. | 76.151053 |
Comprehensive DescriptionRead full entry
BiologyFound usually in open rocky areas but retreats to crevices or holes or hides among spines of sea urchins when threatened. Territorial. Sits on exposed rock surfaces near a hole or crevice. Feeds mainly on small crustaceans. Oviparous (Ref. 56079). Males guard the eggs whi... | <urn:uuid:36448e6e-5551-40e8-9e35-2db7e0ef73ef> | 2.78125 | 116 | Knowledge Article | Science & Tech. | 51.4545 |
Definition of the core floating point types and basic manipulation of them.
The Double type. This is expected to be an identical declaration to the one found in GHC.Prim. We avoid simply using GHC's type because we need to define our own class instances.
The Float type.
Coercion to floating point types.
Convert to a fl... | <urn:uuid:fe0ce2bd-df64-4628-b93f-bf69d58f7841> | 3.078125 | 112 | Documentation | Software Dev. | 52.142431 |
OSO-6 operated from August 1969 until January 1972. The orbital period was
~ 95 minutes, with the orbital day lasting ~ 60 minutes of each orbit. The
spin rate was 0.5 rps.
The hard X-ray detector (27-189 keV) was a 5.1 cm2 NaI(Tl) scintillator,
collimated to 17 deg x 23 deg FWHM. The system had 4 energy channels (sepa... | <urn:uuid:72f9379a-d1e6-41d4-933b-1c4bef03a707> | 2.90625 | 355 | Knowledge Article | Science & Tech. | 80.62204 |
I cant get the right value out for w. the angular velocity, which is 7.3*10^-5 rad/sec.
An aircraft travels a straight line from west to east along the equator at a
constant speed of 100 ms'. Taking the Earth to be a sphere of radius
6400 km, evaluate the angular velocity. | <urn:uuid:1b441f4f-5e8e-474d-a39f-e515400ffe24> | 2.84375 | 72 | Q&A Forum | Science & Tech. | 87.997273 |
LOUISE Emmerson has spent the past five years in a Hobart laboratory preoccupied with understanding the lives of Antarctic Adelie penguins. But it was only a few days ago that she finally saw the real thing waddle into view across the ice. It was love.
Perched quietly amid the Antarctic equivalent of chattering suburbi... | <urn:uuid:4c92f4ad-5db1-41fb-88b5-e460e41a0dd3> | 2.734375 | 315 | Personal Blog | Science & Tech. | 51.597917 |
Previously the enthalpies of formation and combustion have been discussed. However, there are numerous others. In the table below, some of these have been outlined, with a definition given.
|Atomisation ΔHθa||The standard enthalpy change when 1mol of gaseous atoms are formed. Depending on the standard state of the elem... | <urn:uuid:db1a1401-888d-478d-b988-46dd6839dae0> | 3.71875 | 718 | Knowledge Article | Science & Tech. | 49.741935 |
To follow up on this quote, this whole story is fascinating.
New data collected by the Hubble Space Telescope proves, NASA says, that in 4 billion years the Milky Way and Andromeda will collide or pass each other by so closely that the gravitational force each exerts on the other will cause them to slow down to the poi... | <urn:uuid:bcd031b0-0867-4849-9e9d-749505d39825> | 3.296875 | 256 | Personal Blog | Science & Tech. | 59.733462 |
Where did you think I went?
The sun emitted a mid-level solar flare on Thursday from a sunspot known as AR 1520, according to a NASA report. The solar flare began at 1:13 a.m. EDT and peaked at 1:58 a.m. The space agency notes that solar flares are “gigantic bursts of radiation” that are harmless to humans because they... | <urn:uuid:a6a5ef95-9875-4164-b982-742a41771192> | 3.3125 | 252 | Personal Blog | Science & Tech. | 75.13877 |
A man comes face to face with an alien for the first time in this illustration from H G Wells's The War of the Worlds. Photograph: Bettmann/Corbis
The more we consider the possible consequences of contact with an alien intelligence, the better prepared we will be."No one would have believed in the last years of the nin... | <urn:uuid:8f6f7518-cdc9-4c47-9794-6285bce63012> | 2.84375 | 1,177 | Personal Blog | Science & Tech. | 44.36328 |
The beauty and diversity of terrestrial and aquatic organisms never ceases to
Glaucus atlanticus, also known as Blue Dragon or Sea Swallow is a relative of the snails and slugs.
amaze me. A few days ago I posted a blog about a strange-looking sea creature, Glaucus atlanticus. Although small, the beautiful Blue Dragon l... | <urn:uuid:8b37696e-f7ae-497f-943c-cb2596615544> | 3.1875 | 624 | Personal Blog | Science & Tech. | 40.786489 |
Protein Data BankThe Protein Data Bank (PDB) is a repository for 3-D structural data of proteins and nucleic acids. This data, typically obtained by X-ray crystallography or NMR spectroscopy, is submitted by biologists from around the world, is released into the public domain, and can be accessed for free.
The structur... | <urn:uuid:e45400f0-6ec7-4236-83c0-0db033d24905> | 3.140625 | 499 | Knowledge Article | Science & Tech. | 25.643865 |
If one were able to move information or matter from one point to another faster than light, then according to special relativity, there would be some inertial frame of reference in which the signal or object was moving backwards in time
A 2008 quantum physics experiment performed in Geneva, Switzerland has determined t... | <urn:uuid:018f3c3f-e9c7-4ade-8186-797e93f2c74d> | 2.796875 | 159 | Comment Section | Science & Tech. | 25.519118 |
Thu Sep 24 06:22:22 BST 2009 by DonRoberto
I'd be interested in seeing the methodology used to determine these results.
Did the two spacecraft only take data when the Earth was out of view? Did their surveys take reflected earthlight into account?
These are exciting results --- I'd just like to know a little more about... | <urn:uuid:c66abbdb-3550-48cf-88ae-58d003590e10> | 3.78125 | 292 | Comment Section | Science & Tech. | 73.049643 |
In this tutorial, you will see the use of embed tag of html5. It is used for including external resource in your HTML document. With the help of embed tag, you can add video, audio, or image etc. It is a singleton tag. you can not write any thing in it.
There are following attributes in embed tag:
|src||URL||Address of... | <urn:uuid:dd96c375-f3cb-4079-9579-f632e42ec2da> | 2.875 | 233 | Tutorial | Software Dev. | 78.750818 |
NASA's billion-dollar budget for space science survived relatively unscathed for the current year, and officials are hopeful that the same will be true for fiscal 1988. But flight time, not money, is the biggest immediate problem for scientists, acknowledged John Holtz, assistant director of NASA's Astrophysics Divisio... | <urn:uuid:94479c05-cbb3-4939-8f49-2497c8569240> | 3 | 900 | Truncated | Science & Tech. | 37.638692 |
U.S. Water News Online
LOS ANGELES, Calif. -- NASA researchers have the strongest
evidence yet that one of Jupiter's most mysterious moons hides a
fermenting ocean of water underneath its icy coat. This evidence
comes from magnetic readings by NASA's Galileo spacecraft, reported
in the Friday, Aug. 25, edition of the j... | <urn:uuid:71a7490d-35d8-4275-ad0d-cf1ab7f25318> | 3.375 | 966 | Truncated | Science & Tech. | 40.66188 |
Lenticular, or lee wave, clouds form downwind of an obstacle in the path of a strong air current. In the Boulder, Colorado, area, the obstacle is the Front Range of the Rocky Mountains, seen through clouds at the bottom of the picture.
Click on image for full size
Courtesy of UCAR Digital Image Library
Lenticular cloud... | <urn:uuid:1755d6a9-437e-4fbd-8a7c-f38c5d9bef1a> | 3.75 | 583 | Content Listing | Science & Tech. | 62.967671 |
In WBEM, a class is a collection of objects that represents the most basic unit of management. For example, in Solaris WBEM Services, the three main functional classes include CIMClass, CIMProperty, and CIMInstance.
Abstractly, classes are used to create managed objects. Class characteristics are inherited by the child... | <urn:uuid:09e59212-4ec4-4c69-95f4-82a8160fad39> | 3.109375 | 285 | Documentation | Software Dev. | 29.661429 |
Title: Nuclear Magnetic Resonance (NMR) Data: Chemical Shifts for Carbon-13, Part 5: Organometallic Compounds
Author: Mikhova, Bozhana
Editor: Gupta, R.R.; Lechner, M.D.
Source: Landolt-Börnstein, New Series
Keyword: Carbon-13; chemical shift; magnetic properties of nuclei; nuclear magnetic resonance data
ISBN: 978-3-5... | <urn:uuid:448def0c-a811-4c8d-8afd-06c6e65d793d> | 2.71875 | 418 | Truncated | Science & Tech. | 46.160646 |
What is LROC?
The Lunar Reconnaissance Orbiter Camera (LROC) is designed to address two of the prime LRO measurement requirements: 1) Assess meter scale features to facilitate selection of future landing sites on the Moon. 2) Acquire images of the poles every orbit to characterize the polar illumination environment (10... | <urn:uuid:8c419860-b358-46ca-b6b0-2ce8262776bb> | 3.046875 | 355 | Knowledge Article | Science & Tech. | 28.615236 |
Frontogenesis is a measure of the “creation" of a front. Usually,
Frontogenesis refers to the strength of the horizontal temperature gradient.
Horizontal temperature gradient refers to the change of temperature over distance
A simple version of the Frontogenesis equation is: .
Another way to write this equation is: .
T... | <urn:uuid:c05313a5-fe63-4c74-bd1e-378eb140cc5c> | 3.453125 | 225 | Knowledge Article | Science & Tech. | 35.547661 |
Getting hit by a pitcher's best fastball would hurt. So would getting hit by the most powerful cosmic rays -- particles that zip through the universe at nearly the speed of light. Though they're smaller than an atom, the particles carry as big a punch as a fastball. And the "pitchers" for such particles may be supermas... | <urn:uuid:034a33fb-4794-4122-be52-e43611d362c6> | 3.546875 | 322 | Truncated | Science & Tech. | 56.210855 |
Maathai’s longleg (Notogomphus maathaiae)
|Also known as:||Maathai’s clubtail|
|Size||Male abdomen length: 35.1 mm (2)|
Female abdomen length: 35.7 mm (2)
Classified as Endangered (EN) on the IUCN Red List 2006.
First described in 2005, Maathai’s longleg is a clubtail (Gomphidae spp.) belonging to the genus Notogomphus... | <urn:uuid:1c59d83f-7c26-45f0-9786-2d5bc1a03cf0> | 3.265625 | 1,189 | Knowledge Article | Science & Tech. | 48.862403 |
Organoxenon compounds in organic chemistry contain carbon to xenon chemical bonds. The first organoxenon compounds were divalent, such as (C6F5)2Xe. The first tetravalent organoxenon compound, [C6F5XeF2[BF4, was synthesized in 2004.1 So far, more than one hundred organoxenon compounds have been researched.
Most of the ... | <urn:uuid:05e3df31-cf58-443a-bfac-87bd2db48899> | 3.671875 | 701 | Knowledge Article | Science & Tech. | 52.518821 |
Before wastewater reaches recipient waters, nutrients must be removed in order to avoid eutrophication and large algal blooms, which may result in serious damage to animal and plant life. Robert Almstrand at the University of Gothenburg, Sweden, has shown in his thesis that better removal of nitrogen from wastewater ca... | <urn:uuid:13b59875-fca3-4a3a-8b7b-c7be01665252> | 3.15625 | 477 | Content Listing | Science & Tech. | 25.666538 |
Underwater BalloonScience brain teasers require understanding of the physical or biological world and the laws that govern it.
You have a rubber balloon with a string attached to it, and a weight attached to the other end of the string. You put just the right amount of air in the balloon such that if you submerge the b... | <urn:uuid:44c1ce37-53bd-4584-9cf1-b993c4f12aca> | 3.578125 | 339 | Tutorial | Science & Tech. | 67.296181 |
Differential Equations Workbook For Dummies
Once you’ve figured out the type of differential equation you’re dealing with, you can move on to solving the problem by using the method of undetermined coefficients or the power series method. If a stubborn equation comes your way, try using Laplace transform solutions to h... | <urn:uuid:2d40b7f4-d62d-4f37-98b9-e9e7c4da9b10> | 3.953125 | 645 | Tutorial | Science & Tech. | 20.255082 |
acetaldehyde (ăsˌĭtălˈdəhĪd) [key] or ethanal ĕthˈənălˌ, CH3CHO, colorless liquid aldehyde, sometimes simply called aldehyde. It melts at - 123°C, boils at 20.8°C, and is soluble in water and ethanol. It is formed by the partial oxidation of ethanol; oxidation of acetaldehyde forms acetic acid. Acetaldehyde is made com... | <urn:uuid:8fbeb247-1364-4f1e-9957-48940e4c52ed> | 3.453125 | 237 | Knowledge Article | Science & Tech. | 34.218431 |
Joined: 03 Oct 2005
|Posted: Wed Oct 12, 2005 2:26 pm Post subject: Buckyballs and Polymers Used in New, Organic Solar Panel
|Imagine being able to paint a renewable energy source on the walls of your house, without having to shell out most of your life's earnings.
Well, this may no longer be in the realm of fantasy, w... | <urn:uuid:2226fbd3-28d8-4673-91b8-bab8573a427b> | 3.0625 | 413 | Comment Section | Science & Tech. | 30.904086 |
SCIENTISTS from IBM's Almaden Research Center in San Jose, California, have used a scanning tunnelling microscope to produce the first image of a defect in the surface layer of gold. The scientists constructed artificial 'buckling' in the metal, so that 24 atoms were squeezed into the space that would normally hold 23 ... | <urn:uuid:9523e10c-afeb-4e79-b0c6-5913b2377fc0> | 4 | 221 | Truncated | Science & Tech. | 49.067577 |
WITH the world's aid resources concentrated on the immediate needs of survivors, little has so far been done to address the tsunami's environmental impact. But the recovery of coastal ecosystems will be crucial as fractured communities try to piece their lives back together.
Along the Indonesian coast, for example, hab... | <urn:uuid:94d83fff-6574-4a19-95a6-dae3f78412e0> | 3.953125 | 207 | Truncated | Science & Tech. | 38.161621 |
IN VIENNA, Austria, scientists are listening for clandestine nuclear tests. In Norway, other researchers are trying out a device that reveals the contents of a nuclear missile without betraying its deepest secrets. And 1000 kilometres east of Moscow in Votkinsk, 30 Americans who watch Russians make missiles to aim at o... | <urn:uuid:22f063b3-e288-4126-ba2a-ffb3b9501b59> | 2.796875 | 201 | Truncated | Science & Tech. | 39.366283 |
The current range of the African elephant is Africa, south of the Sahara. It occurs in about 35 African states.
The species formerly extended into North Africa up to the Mediterranean coast. In West Africa, only thinly scattered, small populations remain. Central African rainforests still harbour substantial, largely c... | <urn:uuid:a55c7f62-78c3-4228-913f-eab321f41021> | 4.03125 | 502 | Knowledge Article | Science & Tech. | 29.49688 |
Harmful Algal Blooms
There are over 5000 species of tiny single celled plants that make up the marine phytoplankton. These are at the start of virtually all marine food chains and are essential to support marine life.
Harmful phytoplankton produce a range of toxic biochemicals. These are harmless to shellfish, which fi... | <urn:uuid:014d7d99-b79a-4d5e-89ce-2f7a3c04f26c> | 3.328125 | 533 | Content Listing | Science & Tech. | 41.567313 |
As teachers settle into a new school year, it seems a good time to provide some general tips and suggestions on how to make use of popular movies or television in the science classroom. Some of these ideas may be more appropriate for the high school setting, but I hope elementary and middle school teachers will also fi... | <urn:uuid:4649b8d2-7bdf-4793-a499-56822ee9d3f1> | 3.515625 | 1,156 | Personal Blog | Science & Tech. | 58.053294 |
This is the preface of a series of articles I intend to post in the coming weeks about simple ideas, ubiquitous among all programmers, but rarely understood, and too often preached for without any justifiable reason.
Follow me in the coming weeks to understand, once and for all, what's so important in the following con... | <urn:uuid:5907c9ad-4ab1-4dcb-9299-aa9d39031768> | 2.75 | 724 | Personal Blog | Software Dev. | 43.005839 |
LONG flags );
Fill the supplied buffer with info about the available fonts.
The buffer will after function execution first contains a
struct AvailFontsHeader, and then an array of struct AvailFonts
element (or TAvailFonts elements if AFF_TAGGED is specified in the
flags parameter). If the buffer is not big enough for t... | <urn:uuid:32a40156-12ce-4db0-8835-f5c0f69334ed> | 2.921875 | 457 | Documentation | Software Dev. | 49.808058 |
Giant Earthquakes Will Continue
You would think this would be huge news in America. California or Alaska, at least. Mainland Alaska hasn't had a huge 9+ earthquake since before the Alaskan Pipeline was built but you can bet, it has a very good chance of happening now. Failure of this pipeline will have catastrophic eff... | <urn:uuid:d4c7d409-1b9c-4e86-8052-93bef308667a> | 2.796875 | 561 | Personal Blog | Science & Tech. | 53.996749 |
A fresh study by a leading hurricane researcher has raised new questions about how hurricane strength and frequency might, or might not, be influenced by global warming. Eric Berger of the Houston Chronicle nicely summarized the research on Friday.
The research is important because the lead author is Kerry Emanuel, the... | <urn:uuid:d352eaa8-3e4e-470b-94d8-6763ba062883> | 2.765625 | 955 | Personal Blog | Science & Tech. | 45.035213 |
El Niņo: ATSR monthly average Sea Surface Temperature over the
Keywords: ATSR, ESA/ESRIN, SST, El Niņo.
|SST difference between July 1995 and July 1997
El Niņo Effect
ATSR monthly average Sea Surface Temperature at the spatial resolution of 30
arcminutesThe Pacific ocean is usually warmer and higher on the Western
side... | <urn:uuid:846aaf47-eaa3-44c5-bab2-491fd908762a> | 3.453125 | 658 | Knowledge Article | Science & Tech. | 39.886139 |
The reinterpret_cast keyword is used to simply cast one type bitwise to another. Any pointer or integral type can be cast to any other with reinterpret cast, easily allowing for misuse. For instance, with reinterpret cast one might, unsafely, cast an integer pointer to a string pointer. It should be used to cast betwee... | <urn:uuid:45fdffa5-e08a-4699-b02c-d1bcc509593d> | 3.734375 | 204 | Documentation | Software Dev. | 41.945625 |
This map of the ancient sky shows the minute variations in the microwave background discovered by the team led by Lawrence Berkeley Laboratory astrophysicist George Smoot. As seen in the map, vast regions of space have minute variations in temperature. Over billions of years, gravity magnified these small differences i... | <urn:uuid:247e3c44-61c3-43c2-8eff-44db30106a27> | 4.21875 | 436 | Knowledge Article | Science & Tech. | 31.591631 |
File:Sulfur Hexafluoride Molecule VdW.png
From Global Warming Art
This is a space filling model showing the chemical structure of sulfur hexafluoride. The size of each atom is determined by its Van der Waals radius and the relative positions faithfully reproduce the structure of the molecule. Colors follow traditional ... | <urn:uuid:82ec4b3c-c3ce-4e36-9d38-7a573c33d7d5> | 3.09375 | 217 | Truncated | Science & Tech. | 43.6025 |
Jamais Cascio has made it official… “there’s a considerable amount of methane (CH4) coming from the East Siberian Arctic Shelf, where it had been trapped under the permafrost. There’s as much coming out from one small section of the Arctic ocean as from all the rest of the oceans combined. This is officially Not Good.”... | <urn:uuid:7edd05e9-5fff-46d4-8a48-e176769f92de> | 2.8125 | 496 | Personal Blog | Science & Tech. | 44.917476 |
Stationary Orbit Over the Moon
Date: 1993 - 1999
At what altitude off the surface of the moon would a satellite be in
a stationary orbit over the moon?
This is a neat question, but one which does not have a simple answer.
For an isolated planet we can work out the radius of a circular orbit with a
certain period. Top t... | <urn:uuid:31cae12e-e477-42ab-9b81-fbfba96f749a> | 3.421875 | 256 | Q&A Forum | Science & Tech. | 61.771944 |
These measurements enable us to monitor changes to the environment and patterns of land use and can influence environmental policy. Within two years of satellite monitoring showing a hole in the ozone layer, for example, Europe and 24 non-European countries had signed up to The Montreal Protocol on Substances that Depl... | <urn:uuid:d3361c6e-b52a-4ef8-9862-68287ef46e60> | 3.640625 | 546 | Knowledge Article | Science & Tech. | 25.418137 |
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Subtractive colour mixing involves the absorption and selective transmission or reflection of light. It occurs when colorants (such as pigments or... | <urn:uuid:3393a07a-df0a-4485-a379-f1ac3f9f5f78> | 3.296875 | 303 | Knowledge Article | Science & Tech. | 49.207024 |
If you were a small insect you wouldn't want to meet the Northern Silver-stiletto fly (Spiriverpa lunulata) while out strolling on the river bank.
The white eel-like larva of the fly lives just under the soil surface. It detects the vibrations of something walking on the surface; stealthily it wriggles to beneath its u... | <urn:uuid:7675eacf-97ba-4156-b6c7-9c21dd7e1fec> | 3.015625 | 332 | Knowledge Article | Science & Tech. | 44.084808 |
Scientific research has come under fire recently in the brouhaha over e-mails among climate scientists at the Climatic Research Unit at the University of East Anglia in England.
But regardless of where any of us might stand on climate change, it's evident that much of our environmental understanding today has come from... | <urn:uuid:10e54898-d1e1-4460-85d5-65978280edd4> | 3.15625 | 610 | Content Listing | Science & Tech. | 34.30874 |
Scientific Assessment of Ozone Depletion: 1994
The 1994 WMO/UNEP assessment, Scientific Assessment of Ozone Depletion: 1994, contains the understanding of ozone depletion and reflects the thinking of 295 international scientific experts who contributed to its preparation and review. Co-chairs of the 1994 assessment wer... | <urn:uuid:4027671a-ea8a-47a4-b515-c0216c8fbe6f> | 2.828125 | 1,074 | Knowledge Article | Science & Tech. | 32.214733 |
This ASP.NET tutorial explains how to create cookie in ASP.NET.
A cookie, also known as an HTTP cookie, web cookie, or browser cookie, is used for an origin website to send state information to a user’s browser and for the browser to return the state information to the origin site. The state information can be used for... | <urn:uuid:e28d0232-ccbd-43bc-931e-e76f293c03f5> | 3.25 | 165 | Tutorial | Software Dev. | 48.318828 |
© Supernova Cosmology Project, Lawrence Berkeley National Laboratory.
The two primary lines of evidence for dark energy are the accelerated expansion of the universe measured by supernova surveys and the discrepancy between the geometry and amount of matter in the universe measured by the CMB. The plot above, with on t... | <urn:uuid:fdbf642a-5e10-4629-8083-12779e875eee> | 3.234375 | 212 | Truncated | Science & Tech. | 30.562338 |
When the first stars blinked on
December 5, 2012The very first stars may have turned on when the universe was 750 million years old.
GRAIL reveals a battered lunar history
December 5, 2012Twin spacecraft create a highly detailed gravity map of the moon, finding an interior pulverized by early impacts.
Paintballs may de... | <urn:uuid:01441b42-631d-473b-98d8-c0563f0090f3> | 3.546875 | 359 | Content Listing | Science & Tech. | 29.004265 |
Wood on the seafloor- an oasis for deep-sea life
Trees do not grow in the deep sea, nevertheless sunken pieces of wood can develop into oases for deep-sea life - at least temporarily until the wood is fully degraded. A team of Max Planck researchers from Germany now showed how sunken wood can develop into an attractive... | <urn:uuid:985e65d1-d5b1-4680-bff1-15399efe9682> | 4 | 749 | Knowledge Article | Science & Tech. | 38.80715 |
A SINGLE distant star, 600 light years away, plays a greater role in ionising hydrogen gas in our region of the Galaxy than do all other stars combined, say astronomers in the US. The star's feat is all the more remarkable because some 3 million stars lie closer to our "local" cloud of hydrogen than it does.
The star i... | <urn:uuid:1298d267-58df-49ec-acf3-584740a05032> | 3.796875 | 209 | Truncated | Science & Tech. | 49.392303 |
The information is detailed in a study by evolutionary scientist John Hawks. Since the Stone Age, there have been many changes in the human body, most of which are unsurprising. But the revelation that our brains are actually smaller now than they were then could strike some as shocking.
Hawks says over the last 20,000... | <urn:uuid:6299a19d-9758-4fac-a880-a48fd5255d2f> | 3.09375 | 288 | Truncated | Science & Tech. | 55.119954 |
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Note to readers: this is my best attempt to describe some issues in accelerator operations; I welcome comments from people more expert than me if you think I don’t have things quite right.
The operators of the Large Hadron Collider seek to collide as many protons as possible. The experimenters who study these collision... | <urn:uuid:077a4e88-3cd3-44ce-a5e1-6e39f90212d4> | 3.3125 | 1,234 | Personal Blog | Science & Tech. | 49.570694 |
Let's write a function to compute factorials. The
mathematical definition of
n factorial is:
n! = 1 (when n==0) = n * (n-1)! (otherwise)
In ruby, this can be written as:
if n == 0
n * fact(n-1)
You may notice the repeated occurrence of
has been called "Algol-like" because of this. (Actually, the
syntax of ruby more clo... | <urn:uuid:5f6f5062-904f-40a2-8648-021537d294f3> | 3.140625 | 651 | Documentation | Software Dev. | 62.686457 |
Establishing a key link between the solar cycle and global climate, new research led by the National Center for Atmospheric Research (NCAR) shows that maximum solar activity and its aftermath have impacts on Earth that resemble La Niña and El Niño events in the tropical Pacific Ocean.
By simulating 8,000 years of clima... | <urn:uuid:0eb6016e-4e37-48da-8c57-6adc32689210> | 3.46875 | 484 | Content Listing | Science & Tech. | 24.729052 |
Beginners Guide’s to ASP.NET MVC Framework – Part 1 of n October 19, 2009Posted by Abhijit Jana in ASP.NET, MVC Framework.
Tags: .NET, ASP.Net, C# 4.0, codeproject, MVC
This article describes overview of ASP.NET MVC Framework , MVC Control Flow etc.
This article is the Part 1 of the ASP.NET MVC Framework series. In thi... | <urn:uuid:aa4ad089-a93e-4874-9350-433730b1dc4d> | 3.34375 | 614 | Truncated | Software Dev. | 56.790459 |
Solar energy is derived from the light and radiant heat from the sun, an abundant source of renewable energy that can be captured and employed in many ways.
Since ancient times, solar energy has been harnessed by humans using a range of technologies. Current solar technologies include photovoltaic systems (PV), concent... | <urn:uuid:90eff130-7109-4c90-970b-92f0d5e635ba> | 3.96875 | 913 | Knowledge Article | Science & Tech. | 21.294768 |
Major Section: PROGRAMMING
NOTE: It is probably more efficient to use the Common Lisp function
concatenate in place of
string-append. That is,
(string-append str1 str2)is equal to
(concatenate 'string str1 str2).
At any rate,
string-append takes two arguments, which are both
strings (if the guard is to be met), and ret... | <urn:uuid:3612cec4-8577-4f59-8656-6259c940890a> | 2.765625 | 119 | Documentation | Software Dev. | 49.725068 |
|Is that a cloud hovering over the Sun?
Yes, but it is quite different than a cloud hovering over the Earth.
The long light feature on the left of the
above color-inverted image
is actually a solar filament and is composed of mostly charged
hydrogen gas held aloft by the Sun's
looping magnetic field.
By contrast, cloud... | <urn:uuid:7f2642a3-1f49-4a5b-a641-b2792cf46b75> | 3.125 | 195 | Knowledge Article | Science & Tech. | 51.417 |
(Science: chemistry) Having the same percentage composition; said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with with. Specif., Polymeric; i. E, having the same elements united in the same proportion by weight, but with different molecular weigh... | <urn:uuid:6126c828-51c7-45b0-bb31-c0a0f7126782> | 2.9375 | 247 | Structured Data | Science & Tech. | 27.550187 |
And the heat goes on...
One of the great difficulties in testing theories of global warming is doing conclusive experiments. For example, having but one world, it is not possible to manipulate greenhouse gases in the atmosphere while also observing the climate of an unmanipulated experimental control. Thus, there are i... | <urn:uuid:c2ba725b-f448-4340-bdd9-729e6a50b334> | 2.984375 | 723 | Comment Section | Science & Tech. | 36.214044 |
The Galápagos sea lion (Scientific name: Zalophus wollebaeki) is one of 16 species of marine mammals in the family of Eared seals which include sea lions and fur seals. Together with the families of true seals and Walruses, Eared seals form the group of marine mammals known as pinnipeds.
Eared seals differ from the tru... | <urn:uuid:4813339e-093b-49a4-aa10-38026a0fbb52> | 3.546875 | 1,659 | Knowledge Article | Science & Tech. | 45.872919 |
- You'll need these materials:
- a glass or beaker with straight sides
- a ruler (12 inch)
- one foot of clear plastic tubing
- a stick of chewing gum
|Begin by standing the ruler in the glass and
holding it against the side. Tape the ruler to the inside of
the glass. Make sure that the numbers on the ruler are visible... | <urn:uuid:0df9cf22-d216-4051-a0b4-194ffbbf9dfb> | 3.234375 | 430 | Tutorial | Science & Tech. | 63.252843 |
Function Inverse Example 1 Function Inverse Example 1
Function Inverse Example 1
⇐ 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.
- So we have f of x is equal to negative x plus 4, and f of x
- is grap... | <urn:uuid:9bacbf99-2ad8-4227-8cd8-129ecad8382d> | 4.53125 | 1,905 | Audio Transcript | Science & Tech. | 80.932511 |
The Thing Called "Chiron"
Like a snowball rolling downhill, some things just take off and get bigger as they go. That's sort of the case with the story about the object called Chiron, which I first came across when looking up some information about the astronomer Charles Kowal. (See the December, 1998, edition of Night... | <urn:uuid:64e11515-753e-484c-a1c0-a1545a2beedc> | 3.15625 | 522 | Knowledge Article | Science & Tech. | 56.730584 |
News From the Field
DNA Better Than Eyes When Counting Endangered Species
March 7, 2011
Using genetic methods to count endangered eagles, a group of scientists showed that traditional counting methods can lead to significantly incorrect totals that they believe could adversely affect conservation efforts.
The National ... | <urn:uuid:025d55ba-3297-4398-8a97-ae20f485866a> | 2.859375 | 263 | Content Listing | Science & Tech. | 70.19315 |
One drawback to the use of a Python list for source files is that each file name must be enclosed in quotes (either single quotes or double quotes). This can get cumbersome and difficult to read when the list of file names is long. Fortunately, SCons and Python provide a number of ways to make sure that the SConstruct ... | <urn:uuid:684781da-539a-4dad-8a0f-7dc1fedfb3b8> | 3.6875 | 429 | Documentation | Software Dev. | 61.501362 |
Ho - Holminm
Atomic Number: 67 Period Number:6 Group Number: None
Holmium is a silvery-white metal, which belongs to lanthanide series. There is less free element found in nature and most of them exist in the minerals monazite, gadolinite, etc. Only one stable isotope of holmium is found in nature: 165Ho.
Holmium has n... | <urn:uuid:041179dd-df4e-49c8-b992-96793c360fa6> | 3.125 | 186 | Knowledge Article | Science & Tech. | 51.713702 |
Want to stay on top of all the space news? Follow @universetoday on Twitter
Quantum Foam is the series of subatomic disturbances in space time. Quantum Mechanics states that at the subatomic level of a Planck Length that the uncertainty principle comes into play. Essentially that means that space time at such a level c... | <urn:uuid:2694bee9-29c3-45d2-9567-a4d42d95e8a8> | 3.5625 | 504 | Personal Blog | Science & Tech. | 45.927542 |
Complex interactions among hydrologic events initiated by people and the behaviors and characteristics of animal species (both native and introduced) lead to important scientific and management problems.
This endangered species prefers native trees in large, continuous areas of riparian habitat. Armed with this informa... | <urn:uuid:8673d37e-65a8-4374-9345-256708bac197> | 3.21875 | 206 | Content Listing | Science & Tech. | 31.990956 |
Is a ride into space on the world's longest elevator in store for you?
Currently, the Cambridge team can make about 1 gram of the new carbon material per day, which can stretch to 18 miles in length. Alan Windle, professor of materials science at Cambridge, says that industrial-level production would be required to man... | <urn:uuid:0ce025a4-25fd-4eaa-a3a2-e3bca21a6ad5> | 3.078125 | 354 | Personal Blog | Science & Tech. | 55.810442 |
The test package is meant for internal use by Python only. It is documented for the benefit of the core developers of Python. Any use of this package outside of Python’s standard library is discouraged as code mentioned here can change or be removed without notice between releases of Python.
The test package contains a... | <urn:uuid:84be95db-5e3b-4303-bb9e-ae40cf37ff41> | 2.765625 | 3,632 | Documentation | Software Dev. | 49.795791 |
Comprehensive DescriptionRead full entry
A moderate-sized slender salamander identified by having four digits on the hind limb and having a relatively broad and well demarcated head, long limbs and large hands and feet, and a tapering tail. The species has a distinctive color pattern consisting of bright coppery markin... | <urn:uuid:ecd477e0-c45f-4623-953a-61e84dfca434> | 2.984375 | 220 | Knowledge Article | Science & Tech. | 38.997846 |
Roland Piquepaille writes "The GLOBCOVER project, started by the European Space Agency (ESA), has a very simple goal. It will create the most detailed portrait of the Earth's land surface with a resolution three times sharper than any previous satellite map. The image acquisition will be done throughout 2005 and use th... | <urn:uuid:c55cd69d-2819-45c8-a5eb-10acdce88e46> | 3.640625 | 145 | Truncated | Science & Tech. | 20.941857 |
NOAA Teacher at Sea
Aboard NOAA Ship Henry B. Bigelow
July 20 — August 1, 2011
Mission: Cetacean and Seabird Abundance Survey
Geographical Area: North Atlantic
Date: July 30, 2011
Air Temp: 19 ºC
Water Temp: 18 ºC
Wind Speed: 12 knots
Water Depth: 64 meters
Science and Technology Log
When traveling in the ocean you nev... | <urn:uuid:6a0dbe2c-6404-4309-a34d-5b2edcf648d7> | 3.15625 | 748 | Personal Blog | Science & Tech. | 48.638047 |
For value types, “==” and Equals() works same way : Compare two objects by VALUE
int i = 5;
int k= 5;
i == k > True
i.Equals(k) > True
For reference types, both works differently :
“==” compares REFERENCE – returns true if and only if both references point to the SAME object.
Equals method compares object by VALUE.
Str... | <urn:uuid:857fa3b4-98bd-4a21-a30b-edc0a76d0070> | 3.28125 | 504 | Personal Blog | Software Dev. | 66.752414 |
Hydrogen sulfide erupted along the coast of Namibia in mid-March 2010. Pale-hued waters along the shore hinted at gaseous rumblings as the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite passed overhead and captured this true-color image on March 13, 2010. Although ocean water appears na... | <urn:uuid:69c81533-719e-422f-821d-058ed6b935cd> | 3.71875 | 388 | Knowledge Article | Science & Tech. | 48.314484 |
Scientists study a diversity of ocean life!
Every day, scientists at the Alaska Fisheries Science Center work to increase our knowledge about ocean life. How do they do this? What do they learn?
Through this activity you’ll discover how scientists find out where whales go, count fish, study microscopic plants and anima... | <urn:uuid:d358e671-22ca-45a9-9550-c37d733a2717> | 3.59375 | 124 | Tutorial | Science & Tech. | 63.621378 |