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Using Satellites to Monitor Deformation: Radar InterferometryExamples of Interferograms
Satellite-based technique captures overall deformation "picture"
For years, scientists dreamed of a "geodetic camera" capable of snapping a picture that would show in exquisite detail how much
the ground near a volcano was moving. T... | <urn:uuid:f3dbf029-cb31-44ef-b3ce-d84240bccee3> | 3.859375 | 1,620 | Knowledge Article | Science & Tech. | 36.488221 |
Visualizing the Electron Wind Force in Nanostructures
Ellen D. Williams
[This is an invited article based on a recently published work by the authors -- 2Physics.com]
Authors: Chenggang Tao, William G. Cullen, and Ellen D. Williams
Affiliation: Materials Research Science and Engineering Center & Department of Physics, ... | <urn:uuid:00e3a91e-fc13-4019-a252-de787416eec2> | 3.46875 | 981 | Academic Writing | Science & Tech. | 42.43353 |
Saturday 15 June
Sea gooseberry (Pleurobrachia pileus)
Sea gooseberry fact file
- Find out more
- Print factsheet
Sea gooseberry description
Members of the phylum Ctenophora are known as sea-gooseberries or comb-jellies, and are startlingly beautiful marine invertebrates. They are commonly mistaken for jellyfish, but b... | <urn:uuid:c607b231-e295-4a18-96e2-2a0c01bb586f> | 3.640625 | 958 | Knowledge Article | Science & Tech. | 41.496301 |
Tuesday 18 June
Stony coral (Porites lutea)
Stony coral fact file
- Find out more
- Print factsheet
Stony coral description
Porites corals form some of the largest of all coral colonies, with some reaching an incredible eight metres in height (3). The growth rate of Porites coral is very slow, perhaps only nine millime... | <urn:uuid:0cc2cbb8-fe33-4b27-af7a-59f814d83baf> | 3.796875 | 1,740 | Knowledge Article | Science & Tech. | 37.141273 |
Sensitivity of ecosystems
When an oil spill reaches the shoreline, or occurs very near the coast, the phenomena of soiling and coating in oil can have an impact on the populations in the intertidal zone and the various human activities which take place by the sea. Marine birds and mammals are also obvious victims, such... | <urn:uuid:163603a7-a7f9-4a0c-9549-49528ebd3fc9> | 3.515625 | 256 | Knowledge Article | Science & Tech. | 33.592 |
Interviewee: Frederick Sanger.
Frederick Sanger talks about the differences between sequencing proteins and sequencing DNA.
(DNAi Location: Manipulation > Techniques > Sorting and sequencing > Interviews >
Sequencing proteins and DNA)
You know, at first we tried to use the methods we'd used for proteins and to some ext... | <urn:uuid:fc31f59d-5eb7-4a39-8eb6-cb22ee4749ec> | 3.234375 | 335 | Audio Transcript | Science & Tech. | 25.226318 |
Contact: Douglas Pierce-Price
Caption: This artist's impression shows the disc of gas and cosmic dust around a brown dwarf. Rocky planets are thought to form through the random collision and sticking together of what are initially microscopic particles in the disc of material around a star. These tiny grains, known as ... | <urn:uuid:ce5a7eb5-026f-4e9a-9fde-d450d54d4ef5> | 3.796875 | 227 | Knowledge Article | Science & Tech. | 34.713508 |
You can also watch it on YouTube:
Today we'll look at block closures in VA Smalltalk. To get started, you should browse class Block, and take a look at the hierarchy. Typically, when you create a block, it will be an instance of the first subclass:
Blocks represent a deferred bit of code - a loose method, if you will. ... | <urn:uuid:7135934d-b8cb-44b2-87b4-e131eda49eb6> | 3.4375 | 569 | Tutorial | Software Dev. | 60.866998 |
Lab 6: Fourier Analysis
A steady musical tone from an instrument or a voice has, in most cases, quite a complicated wave shape. The oscillations repeat themselves f times a second, where f is called the fundamental frequency. We have learned that f is related to the pitch of the tone. Tones played on different instrume... | <urn:uuid:2710f5a7-7937-4f4b-bd32-d9d96502c11d> | 4.5625 | 1,959 | Tutorial | Science & Tech. | 51.312151 |
How do holographic images work?
Visa cards are printed with little holographic doves as forgery protection, and I've seen similar holographic images printed on things no thicker than a piece of construction paper. Soon there will be chocolate bars with holographic decorations etched on the surface (this according to Sc... | <urn:uuid:a0471925-06a0-4c6c-b9e4-b2d6ef6200bd> | 3.3125 | 622 | Personal Blog | Science & Tech. | 52.770659 |
Many beginners associate REST url’s with url having some identifier to identify the resource even if the identifier is present in the url parameter.
Here the url seems to be identifying a resource (product) with an identifier (productid) 1
However technically this is not a RESTful url.
REST ways of looking at resources... | <urn:uuid:ff93e5ed-d2ec-4b8f-9738-4780566a9db8> | 2.921875 | 303 | Tutorial | Software Dev. | 41.009364 |
Let’s try and understand why we should care more about this in the first place. This requires a little bit of historical explanation.
We all know Moore’s Law. It says the number of transistors on integrated circuits doubles approximately every two years. The prediction has been working pretty well since late ‘70. Coupl... | <urn:uuid:9c31957b-2f0e-4b67-af44-e596e983b46c> | 3.09375 | 716 | Personal Blog | Software Dev. | 54.775543 |
Let the Earth do its own lifting
We hear a lot about what we can do to look after the earth . but clearly not enough about how the earth looks after itself.
The media have started using the great idea and word resilience but they don't know what it means ( it was my profession but few therebe that practice and teach it... | <urn:uuid:45e00efc-a1fa-46e8-950e-1f7ee7817e09> | 2.828125 | 361 | Personal Blog | Science & Tech. | 46.911173 |
This species is widespread and common throughout its range.
- Bombus terrestris and lucorum (Laura Brodie, University of Aberdeen, www.bumblebee.org)
- Importation of Non-Native Bumble Bees into North America: Potential Consequences of Using Bombus terrestris and Other Non-Native Bumble Bees for Greenhouse Crop Pollina... | <urn:uuid:96cd1853-0491-47a0-8013-dbf4de165cf6> | 3.03125 | 163 | Knowledge Article | Science & Tech. | 40.394226 |
Go to original
Utah Monitor of 'Cold Fusion' Casts Doubt on Its Validity
The New York Times
March 29, 1990
A physicist at the University of Utah says a highly publicized ''cold fusion'' experiment at the school failed to produce any evidence of a nuclear reaction when he monitored it.
The scientist, Michael H. Salamon,... | <urn:uuid:d7829260-3f42-4c3a-a750-88098ea616e2> | 2.8125 | 673 | Truncated | Science & Tech. | 45.917051 |
Practise your skills of proportional reasoning with this interactive haemocytometer.
How many generations would link an evolutionist to a very distant
Work with numbers big and small to estimate and calculate various quantities in biological contexts.
Analyse these beautiful biological images and attempt to rank them i... | <urn:uuid:6d46620e-9421-422b-9561-5c1fdde2b16b> | 3.453125 | 257 | Content Listing | Science & Tech. | 46.602929 |
Hot Water and Hurricanes
What is the ocean's role in powering hurricanes? Why do some storms experience rapid intensification, a rapid increase of wind speeds, as they move over warm waters? Why do the storms become weaker once they move onto land?
In this lab, you'll use Hurricane Katrina as a case study to explore wh... | <urn:uuid:5d8968f7-d787-415e-a6ad-c49ad5e464e9> | 4.0625 | 308 | Tutorial | Science & Tech. | 30.672842 |
The Glory of Geckoes
Posted by Richard Conniff on September 24, 2012
When I first held the Giant Leaf tailed gecko (U. fimbriatus) in my hand after catching it in the rainforest of northern Madagascar, it felt as if I were holding a living, breathing beanie baby. It was the size of small puppy, and its skin was velvet-... | <urn:uuid:aef747fd-744c-4a68-b500-2daa61470ad7> | 3.625 | 468 | Personal Blog | Science & Tech. | 51.90081 |
Every few hundred thousand years Earth's magnetic field dwindles almost to nothing for perhaps a century, then gradually reappears with the north and south poles flipped. This phenomenon is know as magnetic fields reversal.
Such reversals happen at intervals, ranging from tens of thousands to many millions of years, wi... | <urn:uuid:2e9554ee-d546-45a1-8f89-b1313a919691> | 3.796875 | 217 | Knowledge Article | Science & Tech. | 41.327716 |
Experts in RNA Probes
RNA, usually prepared by transcription from cloned DNA, which complements a specific mRNA or DNA and is generally used for studies of virus genes, distribution of specific RNA in tissues and cells, integration of viral DNA into genomes, transcription, etc. Whereas DNA PROBES are preferred for use ... | <urn:uuid:eef05f40-c9bb-481a-b58d-984d2a5f07f1> | 3.53125 | 147 | Knowledge Article | Science & Tech. | 23.549605 |
Warty tree frog (Scinax boulengeri), Costa Rica.
© Piotr Naskrecki
Scientists believe that ancient amphibians were the first vertebrates to leave the water and colonize our planet's shores millions of years ago.
Modern-day amphibians – frogs, toads, newts, salamanders and caecilians – also constitute an important link ... | <urn:uuid:3dc8656a-8044-4bab-ae38-c2d6c338f5e0> | 3.65625 | 246 | Knowledge Article | Science & Tech. | 22.01376 |
HTTPS SERVER FOR USER PASSWORD CHANGE
This server provides a safe and friendly way for users to change
their password from a web browser.
The server is simply a front end to commands or scripts that will
perform the real passwords change. This can be used with commands like passwd, yppasswd, smbpasswd, ldappasswd, vncp... | <urn:uuid:98289ad8-cf93-439f-abad-476250909c52> | 2.734375 | 1,640 | Documentation | Software Dev. | 57.85808 |
An abiotic factor is any of a number of the non-living components of a habitat. Abiotic factors can be grouped into the categories of meteorology, soil, air pollution, micro-topographic features, water availability and water quality. In terms of meteorological factors, the primary abiotic factors can be construed to be... | <urn:uuid:5da0ab58-8650-4eae-96e2-42f4603eae96> | 3.40625 | 2,986 | Knowledge Article | Science & Tech. | 24.497973 |
The study attempts to determine the adsorption characteristics of bed sediments of rivers for the control of metal pollution. In particular, it looks at adsorption of zinc ions on bed sediments for the river Ganga at Hardwar. In the natural conditions of river water, suspended loads and sediments have an important func... | <urn:uuid:be945638-eced-47f4-ac07-e1884f703a88> | 2.703125 | 384 | Academic Writing | Science & Tech. | 22.075102 |
Command File SyntaxEpsilon's command files appear in a human-readable format, so you can easily modify them. Parentheses surround each command. Inside the parentheses appear a command name, and optionally one or more arguments. The command can be one of several special commands described in the next section, or most an... | <urn:uuid:e227cfa0-4e4f-41a3-8602-b426c7c584e7> | 3.1875 | 419 | Documentation | Software Dev. | 38.380297 |
When IDL starts, it sets the values of a variety of system variables. System variables are a special class of predefined variables that are available to all IDL program units; they are described in detail in System Variables. The values of some system variables can be specified by the user when IDL starts, either via o... | <urn:uuid:9fe7a2f0-57ce-4b99-9091-fc33b49bb997> | 2.765625 | 1,149 | Documentation | Software Dev. | 31.507739 |
Whirligig beetle (Gyrinus natator) Royalty Free Science Image
Whirligig beetle (Gyrinus natator) Royalty FreeRef: 12640
Description:Whirligig beetle. Coloured scanning electron micrograph of the head of a whirligig beetle, Gyrinus natator. Whirligig beetles are small, shiny black insects that skim round and round on th... | <urn:uuid:7416599f-46b9-493d-b88d-2d7bf511be45> | 3.03125 | 183 | Truncated | Science & Tech. | 54.752525 |
Short Summaries of Articles about Mathematics
in the Popular Press
"Secrets of an Acid Head," by Dana Mackenzie. New Scientist, 23 June 2001,pages 26-30.
In the 1920s, a University of Chicago neuroscientist categorized hallucinationsinto four types: tunnels, spirals, cobwebs, and honeycombs. Today,mathematician and neu... | <urn:uuid:72665062-6b5c-48a8-bafb-daca4c9104c0> | 3.125 | 188 | Content Listing | Science & Tech. | 23.926829 |
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
January 25, 1997
Explanation: The Whirlpool Galaxy is a classic spiral galaxy.
At only 15 million light years distant, M51,
also cataloged as NGC 51... | <urn:uuid:fdf832f8-a190-423c-9e88-0bf36b034fb0> | 3.171875 | 192 | Knowledge Article | Science & Tech. | 49.287731 |
The method of least squares used to invert an orbit problem
Bannister, R. (2003) The method of least squares used to invert an orbit problem. American Journal of Physics, 71 (12). pp. 1268-1275. ISSN 0002-9505
Full text not archived in this repository.
To link to this article DOI: 10.1119/1.1613270
Six parameters uniqu... | <urn:uuid:f9d742ca-c3f5-445e-8b04-8e27f0112be7> | 3.3125 | 218 | Academic Writing | Science & Tech. | 44.271213 |
is an attribute available on polygon mesh objects. It is an array of strings containing the names of materials that can be used on polygons in that mesh, such as "Sources.Materials.DefaultLib.Blue". The material names are resolved at render time, so undefined material names will not show as errors in the ICE tree. If a... | <urn:uuid:b2b61e19-1f55-4403-9c06-70b75560b091> | 2.828125 | 316 | Documentation | Software Dev. | 47.476667 |
Alpheus is the most diverse shrimp genus. Some of their defining characteristics are orbital hoods and an oversized claw which they use for defense and killing prey. When this claw is snapped shut it shoots out water which creates a low pressure air bubble behind it. The bubble reaches temperatures of 5000 degrees Kelv... | <urn:uuid:5edc3eb9-ae1f-4079-8370-b3259e23a840> | 3.40625 | 438 | Knowledge Article | Science & Tech. | 72.604667 |
Given that there are thousands of asteroids and probably a hundred thousand million comets, these small bodies must be considered essential components of the solar system. Certainly objects closely similar to the small bodies that remain today were involved in the agglomeration of the larger planets and satellites some... | <urn:uuid:b0129493-5831-4a19-8fbb-125afd1da1a2> | 4.1875 | 3,152 | Academic Writing | Science & Tech. | 33.5655 |
Harnessing nuclear fusion, the energy that powers the sun and the stars, has been a goal of physicists worldwide since the 1950s. It is essentially inexhaustible and it can be created using hydrogen isotopes — chemical cousins of hydrogen, like deuterium — that can readily be extracted from seawater. […] Fusion energy ... | <urn:uuid:c7b98153-9650-4d50-b947-27579a472e8a> | 3.546875 | 616 | Personal Blog | Science & Tech. | 35.2702 |
Let's Explore Electricity!
Electricity is the most widely used form of energy. Its uses range from the miniature batteries that operate your wristwatch to huge motors that power trains and ships. Electricity operates our lights, runs our refrigerators and powers motors. It first must be changed to other forms of energy... | <urn:uuid:cf80ec77-5889-4ad1-ab1a-888bde8f1889> | 3.9375 | 372 | Knowledge Article | Science & Tech. | 54.79263 |
Here are some circle bugs to try to replicate with some elegant
programming, plus some sequences generated elegantly in LOGO.
Explore this how this program produces the sequences it does. What
are you controlling when you change the values of the variables?
Can you puzzle out what sequences these Logo programs will giv... | <urn:uuid:e2577466-8d7c-4d0d-b1c6-2cdd5c3dd4a0> | 3.078125 | 1,418 | Content Listing | Science & Tech. | 65.067726 |
HTML Object Element
The HTML 4.0 <OBJECT> element is designed for extending HTML. The <OBJECT> element allows an author to download external data or programs into the current page. This element can be used to download Java Applet's, ActiveX controls, Scriptlets, or other types of information. The long-term goal for the... | <urn:uuid:1f38aecc-8489-451f-8647-a4f5c93767b2> | 2.75 | 345 | Documentation | Software Dev. | 45.421533 |
Earth’s Clouds Are Getting Lower, NASA Satellite FindsFebruary 22, 2012
Earth’s clouds got a little lower — about one percent on average — during the first decade of this century, finds a new NASA-funded university study based on NASA satellite data. The results have potential implications for future global climate.
Sc... | <urn:uuid:0d1d7372-10fd-492d-9aa9-b51be25aca90> | 3.25 | 239 | Truncated | Science & Tech. | 32.221875 |
For 140 million years, sauropods roamed Earth--but today we have just fossils to tell us about what these animals looked like from the outside. How big were they? How big were their young? What did their skin look like? How fast could they move? And while fossils can't answer every question--like what color the animals... | <urn:uuid:322ab38e-1948-4ae2-91c2-511204ffce63> | 4.1875 | 327 | Knowledge Article | Science & Tech. | 59.511455 |
Markov processArticle Free Pass
Markov process, sequence of possibly dependent random variables (x1, x2, x3, …)—identified by increasing values of a parameter, commonly time—with the property that any prediction of the next value of the sequence (xn), knowing the preceding states (x1, x2, …, xn − 1), may be based on th... | <urn:uuid:232bd5d9-ef25-497a-971a-1c17bc48b6f2> | 2.90625 | 201 | Knowledge Article | Science & Tech. | 44.204683 |
Chemguide: Support for CIE A level Chemistry
Learning outcome 9.6(d)
This statement is about the uses of ammonia, and other nitrogen containing compounds produced from it.
Before you go on, you should find and read the statement in your copy of the syllabus.
This is seriously boring stuff, and you probably already know... | <urn:uuid:b60e7c63-35b0-40b7-9253-685c8c81ff61> | 3.25 | 152 | Tutorial | Science & Tech. | 44.295 |
Graphene and Other Two-Dimensional Materials
We found a new class of materials which is now referred to as 2D atomic crystals. Such crystals can be seen as individual atomic planes “pulled out” of bulk, 3D crystals.
Despite being only one atom thick and unprotected from the immediate environment, these materials are st... | <urn:uuid:8126d9fc-3ba3-4fd2-be0f-cc6c9302f0c5> | 2.703125 | 177 | Academic Writing | Science & Tech. | 25.0775 |
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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Topic review (newest first)
what is muirheads' inequality?
Try a = 2, b = 2, c = 1.
You are okay after A)
Mistake made in B.
It was a pretty good idea though.
It is okay. I... | <urn:uuid:6b7a2f21-92a9-4639-8eac-d6a44977c882> | 2.84375 | 362 | Comment Section | Science & Tech. | 92.423611 |
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °
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Topic review (newest first)
So far all I can say is the Taylor theorem already states that somewhere so you are using a theorem to prove the linear approximation.
Good to l... | <urn:uuid:e4a28e83-c750-4afa-bbb4-061fdafc90da> | 3.140625 | 641 | Comment Section | Science & Tech. | 68.551227 |
Angles, Interior and
Corresponding Angles, Parallel
|Two cars pass each other, going in opposite directions on separate and parallel
roadways. A crazy driver breaks through all the guard rails and narrowly misses
the other two drivers, Pip and Porter. Fortunately, Pip and Porter are outstanding
math students, and once ... | <urn:uuid:450bef2a-14ff-4fed-9961-d151fb4e802b> | 3.90625 | 378 | Documentation | Science & Tech. | 50.904701 |
Joined: 16 Mar 2004
|Posted: Wed Apr 02, 2008 3:37 pm Post subject: Return of the nanostripes
|4 July 2007 NanoTechWeb
Return of the nanostripes
A research team in Germany has discovered nanoscale stripe-like structures in high-temperature superconductors made from samarium, barium, copper and oxygen. Many physicists b... | <urn:uuid:67ddcc7a-28cb-43c6-9336-81c1cc2cd3f1> | 3.328125 | 692 | Comment Section | Science & Tech. | 29.835748 |
THE genetically engineered crops of tomorrow could be created in orbit. Away from the Earth's gravity, it becomes much easier to insert foreign genes into soya beans, claim biotechnologists in Indiana.
Millions of hectares in the US are already planted with genetically modified soya beans. But creating these crops was ... | <urn:uuid:5517c8b6-916c-4ca3-b838-6f2db32a890d> | 3.5 | 150 | Truncated | Science & Tech. | 35.947105 |
BCH5425 Molecular Biology and Biotechnology
Dr. Michael Blaber
The restriction/modification system in bacteria is a small-scale immune system for protection from infection by foreign DNA.
W. Arber and S. Linn (1969)
Plating efficiencies of bacteriophage lambda (l phage) grown on E. coli strains C, K-12 and B, when plat... | <urn:uuid:a62dfcfd-9158-4556-aa3a-ce71bcea2523> | 3.046875 | 1,739 | Academic Writing | Science & Tech. | 65.519808 |
Some people claim this story is based on a real event. But of course, it’s just an urban myth.
The creation/evolution controversy is not immune to “urban myths.” Recent research has helped unravel one such “myth,” namely the belief that the vertebrate retina exhibits bad design.
In 1996, evolutionary biologist Richard ... | <urn:uuid:8c8cb556-459a-4d0c-96b3-ff9b5b9bc71c> | 3.6875 | 615 | Personal Blog | Science & Tech. | 41.066923 |
So, NASA sent a new satellite up at Vandenburg Air Force Base today here in Southern California. The Aquarius observatory - their materials promise - will, within a few months, "collect as many sea surface salinity measurements as the entire 125-year historical record from ships and buoys." They expect to cover the ear... | <urn:uuid:31d95c1b-fe80-438b-8411-5c261dd3b9bc> | 3.1875 | 946 | Personal Blog | Science & Tech. | 36.640364 |
I tend to avoid the creationist blogs. Every time I get sucked into that vortex of pseudoscience, I find the exact same debunked claims that were bunk when I was 12. There are better bloggers out there who have the energy and patience to systematically dissect the same tired old rubbish day after day, but I’m not one o... | <urn:uuid:03ac69eb-e2f5-48b5-991b-2a3b868f0a68> | 2.75 | 1,582 | Personal Blog | Science & Tech. | 55.399708 |
Carbon Trapping or Is It Carbon Wasting?
The EPA (Environmental Protection Agency) announced that they have concluded a first draft of a carbon trapping rules. These rules would require smokestack owners to filter the emissions from their smokestacks and create liquified CO2 that could be stored underground. Granted, p... | <urn:uuid:961a9c13-2694-4bb5-9090-86d54fc13920> | 2.75 | 538 | Personal Blog | Science & Tech. | 38.244958 |
Newfoundland Predator Project
CSI Newfoundland: molecular determination of caribou calf predators
Student: Matt Mumma
Visit Matt's research page
The Newfoundland woodland caribou (Rangifer tarandus) population has decreased by greater than 66% since 1996. Habitat loss and overgrazing are likely implicated, but current ... | <urn:uuid:5ba18cf8-17d3-4522-b565-9c8e82fbf088> | 3.203125 | 415 | Academic Writing | Science & Tech. | 29.968894 |
NASA satellites pinged the surface of the Earth with 2.5 million carefully positioned laser pulses to measure the height of the world's forests. The map above shows the peak height of the canopy with a spatial resolution of 0.6 miles.
The tropics as you might expect, have a high canopy height with large areas of red fo... | <urn:uuid:67858347-5d7f-472c-9759-8dc4a25aaf82> | 3.75 | 136 | Personal Blog | Science & Tech. | 52.266571 |
In this image provided by NASA Tuesday Sept. 13, 2005 the Hubble Space Telescope "caught" the Boomerang Nebula in these new images taken with the Advanced Camera for Surveys. This reflecting cloud of dust and gas has two nearly symmetric lobes (or cones) of matter that are being ejected from a central star. Over the la... | <urn:uuid:f7073be4-0186-41ea-80e1-3ce7ba941f90> | 3.75 | 181 | Truncated | Science & Tech. | 51.596954 |
5. Diffusion and the mechanism
To determine the frequencies of modes of oscillation for a star requires only that we solve the adiabatic equations. Solving the full nonadiabatic equations of stellar oscillation allows us to calculate the growth rates of the modes, and hence to determine which of the modes are overstabl... | <urn:uuid:175f7cae-e99c-4cc1-a9dc-880cbbad6a08> | 2.9375 | 980 | Academic Writing | Science & Tech. | 32.028684 |
Today I found out that one Calorie is equivalent to one gram of TNT in terms of energy. First of all, lets clarify what is one calorie means. A Calorie is the amount of energy required to raise the temperature of one kilogram of water by one degree Celsius. One Calorie is also approximately 4.184 kilojoules or about 1.... | <urn:uuid:0b64e07f-1fbd-420a-aeab-8ad096aa43bd> | 3.015625 | 340 | Personal Blog | Science & Tech. | 59.531903 |
As I move around the states looking at the differences between the GISS station temperatures, the USHCN homogenized temperatures and the original raw temperature data (albeit modified by a correction for the Time of Observation (TOBS), we have returned to Kansas, which I had originally written about before the TOBS dat... | <urn:uuid:a6c6c56f-a08a-459c-b955-21915cc0589e> | 2.703125 | 918 | Personal Blog | Science & Tech. | 41.251923 |
Coronet Cluster: A region of star formation about 420 light years from Earth.
Caption: The Corona Australis region is one of
the nearest and most active regions of
ongoing star formation in our Galaxy.
At only 420 light years away, the
Coronet is 3.5 times closer than the
Orion Nebula Cluster. The Coronet contains
a lo... | <urn:uuid:ede59da5-ce69-4cc0-9554-63c7c773df7d> | 3.5625 | 212 | Truncated | Science & Tech. | 51.765703 |
Because for truly reliable information on a subject matter as extensively researched as earth's climate, what you should be looking for are statements of large and independent scientific organizations of good reputation. In the case of climate change, that would be national or international bodies of geologists, climat... | <urn:uuid:e528b5eb-6dbb-4be4-8a37-47b75c227f49> | 2.84375 | 255 | Personal Blog | Science & Tech. | 36.286778 |
St. Helens might be part of a supervolcano.
IS A supervolcano brewing beneath Mount St Helens? Peering under the volcano has revealed what may be an extraordinarily large zone of semi-molten rock, which would be capable of feeding a giant eruption.
Magma can be detected with a technique called magnetotellurics, which b... | <urn:uuid:0a88f040-dfde-4eaf-9783-b271e2f123a6> | 3.53125 | 313 | Personal Blog | Science & Tech. | 42.325709 |
An object is hashable if it has a hash value which never changes during its lifetime (it needs a __hash__() method), and can be compared to other objects (it needs an __eq__() or __cmp__() method). Hashable objects which compare equal must have the same hash value.
Hashability makes an object usable as a dictionary key... | <urn:uuid:6aa8753b-b6d9-4387-afb1-0f4073c32a57> | 3 | 163 | Structured Data | Software Dev. | 47.419228 |
The blind cavefish (Astyanax mexicanus) is a sightless version of a popular aquarium species, the Mexican tetra. They live in 29 deep caves scattered throughout Mexico, which their sighted ancestors colonised in the middle of the Pleistocene era. In this environment of perpetual darkness, the eyes of these forerunners ... | <urn:uuid:782b916b-ca0c-4074-b40f-1bdd2eb30e2f> | 4.28125 | 523 | Personal Blog | Science & Tech. | 42.545625 |
Eternal Life of Stardust
The Eternal Life
ENLARGE Image IPAC NASA High Resolution
by Staff WritersPasadena CA (SPX) Sep 01, 2006
A new image from NASA's Spitzer Space Telescope is helping astronomers understand how stardust is recycled in galaxies. The cosmic portrait shows the Large Magellanic Cloud, a nearby dwarf ga... | <urn:uuid:722dccf9-152a-4d11-9a48-903ec11ce51d> | 3.4375 | 2,154 | Personal Blog | Science & Tech. | 39.529802 |
How do we know about the different climates that Britain has experienced in the past? Geologists find evidence in all sorts of places.
The characteristics of different rocks depend on the environment in which the sediments were deposited.
Some sands and gravels are dropped by glaciers as they melt and they become a dis... | <urn:uuid:ca78d49b-05f7-4e5f-9727-a8d80eb40199> | 4.53125 | 911 | Knowledge Article | Science & Tech. | 37.463814 |
Bio-Rock is a technology that uses low voltage electrical current on artificial underwater structures to encourage growth of Corals and other reef life. Experiments with the technology worldwide have shown that it can help counteract some of the difficult environmental factors affecting coral growth.
In conjunction wit... | <urn:uuid:858f2667-7d9d-46c5-b24f-38f059e7bd22> | 2.96875 | 230 | Knowledge Article | Science & Tech. | 44.018235 |
NASA Arctic Observatory & Sea Ice in the Polar Regions
Field of Science or Math
9, 10, 11, 12
Arctic Observatory - Interactively addresses Arctic phenomena and processes, allowing students to ask and answer questions about interrelationships among several physical aspects of the Arctic system. A printable teacher's gui... | <urn:uuid:a17d4cef-00dd-4310-a299-24749dfd106b> | 3.03125 | 118 | Content Listing | Science & Tech. | 38.883323 |
The basics of embedded software testing: Part 1
Test is the last step in traditional software development. We gather requirements, do high level design, detailed design, create code, do some unit testing, then integrate and start—finally— final test.
Since most projects run late, what do you think gets cut? Test, of co... | <urn:uuid:7b765437-16a6-49eb-9b39-bf1dcd901f4e> | 2.953125 | 896 | Tutorial | Software Dev. | 42.4325 |
|Paleo Slide Set: The Ice Ages|
|Earth's axial tilt, adapted from Pisias and Imbrie [1986/1987]|
Croll was aware that the obliquity of earth's axis varied through time, but Leverrier's astronomical calculations only allowed Croll to include eccentricity and precession in his theory.
Milankovitch, on the other hand, ben... | <urn:uuid:a4143478-97ae-4893-aa77-2f7d31e0d1bb> | 4.25 | 384 | Knowledge Article | Science & Tech. | 36.820075 |
A tenuous layer of gas, tens of kilometres above our heads, is an essential part of the "life support system" of Planet Earth. Without the ozone layer, it is doubtful that there would be any life on land
EARTH is unique among the planets of our Solar System in having an atmosphere that is chemically active and rich in ... | <urn:uuid:e331cc1b-7071-45a6-8a32-5b3b0ff2955e> | 3.796875 | 200 | Truncated | Science & Tech. | 39.366283 |
Using the Style AttributeHow to use the style attribute in an html tag
To help clarify this, let's look at an example. If you want the color of some text to look red, the style attribute would look like this:
The style sheet property is "color". The value of the color is "red". Notice there is a colon in between color ... | <urn:uuid:f645bc92-204f-4143-9b09-6d7425b9af59> | 3.546875 | 507 | Tutorial | Software Dev. | 66.729193 |
Larger (smaller) velocity means
larger (smaller) acceleration.
Two cars are travelling down a road. At 12:15 pm the two drivers
of the cars look at their speedometers. The driver of one car reads
30 mph, the other driver reads 60 mph on their speedometer. Which car
has a greater acceleration? Explain your answer. If yo... | <urn:uuid:2c5ced6f-b302-4f64-a6e8-f7ece1bb913e> | 4.03125 | 171 | Tutorial | Science & Tech. | 63.93771 |
Principal ideal domains are thus mathematical objects which behave somewhat like the integers, with respect to divisibility: any element of a PID has a unique decomposition into prime elements (so an analogue of the fundamental theorem of arithmetic holds); any two elements of a PID have a greatest common divisor.
A pr... | <urn:uuid:35295fea-56cf-4ab1-8015-da6acf3cf16e> | 3.515625 | 425 | Knowledge Article | Science & Tech. | 31.936467 |
The Expect package contains a program for carrying out scripted dialogues with other interactive programs.
First, fix a bug that can result in false failures during the GCC test suite run:
patch -Np1 -i ../expect-5.43.0-spawn-1.patch
Now prepare Expect for compilation:
./configure --prefix=/tools --with-tcl=/tools/lib ... | <urn:uuid:8fb29c23-f39f-4a24-932c-57dbae74f895> | 3 | 333 | Tutorial | Software Dev. | 48.681727 |
On March 14, Reuters shipped a story about rapid recession of the Himalayan glaciers—the largest nonpolar ice mass in the world. They quoted from a World Wildlife Fund press release stating “Himalayan glaciers are among the fastest retreating glaciers globally due to the effects of global warming.
WWF timed its press r... | <urn:uuid:587c58d3-863d-4e90-a0ee-f680a9ad5e59> | 3.328125 | 1,044 | Nonfiction Writing | Science & Tech. | 47.825257 |
When it Comes to Accelerators,
What is Cold?
Heather Rock Woods
Superconductivity arises in special materials at super cold
temperatures. At these temperatures—a few degrees above absolute
zero—the materials’ electrical resistance virtually vanishes.
A Fermilab technician works
on an array of superconducting niobium ca... | <urn:uuid:a0720c36-74dc-4c32-ab9d-a58a004311e8> | 4.03125 | 1,000 | Knowledge Article | Science & Tech. | 32.517731 |
The Code wrote:
Did the spiral in our galaxy have a hidden unseen reason. Was the gravity at the center of our galaxy really stronger at some point that makes it looks like it does ? If So, Could our sun have another point of creation ?
if Not..... Explain the spiral Please.....
<<The first acceptable theory for the sp... | <urn:uuid:e5971abb-0086-4265-a703-021d3657e120> | 4.0625 | 1,138 | Comment Section | Science & Tech. | 60.471527 |
We read about global warming raising sea levels. Does this hold true for Lake Michigan as well?
It does not, because Lake Michigan and all the Great Lakes, unlike the oceans, are not the final repository of the world’s water. The Great Lakes drain into the Atlantic Ocean via the St. Lawrence River, and their volume of ... | <urn:uuid:6ce0d0d4-35c6-4f0d-837d-5c3e81b0b310> | 3.8125 | 188 | Knowledge Article | Science & Tech. | 53.526321 |
This composite image contains X-rays from Chandra (blue) and optical data from the VLT (gold) of the galaxy NGC 3115. Using the Chandra data, the flow of hot gas toward the supermassive black hole in the center of this galaxy has been imaged. This is the first time that clear evidence for such a flow has been observed ... | <urn:uuid:b76d27ca-26de-4024-9838-406857951e6d> | 3.15625 | 143 | Truncated | Science & Tech. | 61.371739 |
The thermite reaction
This demonstration shows the highly exothermic reaction between aluminium and iron(III) oxide that produces molten iron. This is a competition reaction, showing aluminium to be a more reactive metal than iron. A redox reaction takes place.
The reaction is violent but safe provided the procedures a... | <urn:uuid:85cbc1c2-319f-4f08-8105-1b7a4ae97700> | 4.09375 | 1,490 | Tutorial | Science & Tech. | 43.506239 |
The SQL type system is used by the language compiler to determine the compile-time type of an expression and by the language execution system to determine the runtime type of an expression, which can be a subtype or implementation of the compile-time type.
Each type has associated with it values of that type. In additi... | <urn:uuid:a0f04f62-d282-4f98-a4c0-8b1fede3d556> | 3.203125 | 145 | Documentation | Software Dev. | 35.713116 |
Photograph by Deshakalyan Chowdhury/AFP/Getty Images
Tsunamis can wreak havoc on coastal populations and landscapes. The December 26, 2004, tsunami in the Indian Ocean claimed some 150,000 lives and cleared the landscape on millions of acres of oceanfront terrain. Here are some measures you can take to avoid trouble if... | <urn:uuid:8e11ca7d-fd09-4a17-a7cb-4e72192fc109> | 3.78125 | 301 | Listicle | Science & Tech. | 47.244711 |
First, I have to give them props for using the term "forecast" rather than "predict". I know a number of volcanologists who are touchy about using "predict", because any conclusions about what a volcano may or may not do are necessarily based on probabilities, just like a weather forecast. When people start thinking th... | <urn:uuid:741efca8-c156-4f35-af6f-69cab56492d8> | 3.296875 | 663 | Personal Blog | Science & Tech. | 24.019638 |
Experience indicates that most of the matter in the Universe is composed of ionized or partially ionized gas permeated by magnetic fields. Celestial objects are magnetized and magnetic fields of significant strength are found everywhere in the interstellar space, and over small and very large scales, in the extragalact... | <urn:uuid:bd379e26-fae3-4f94-bf6c-174bc197f6c9> | 3.203125 | 992 | Academic Writing | Science & Tech. | 47.408932 |
The creatures of the deep are different—so different that some don’t even look like creatures.
(Images: A couple of shots from the Hawai`i Undersea Research Laboratory deep sea creature collection include the outrageously spiky crab Lethodidae neolithodes and the impressively patterned starfish Pentaceraster cumingi. C... | <urn:uuid:5b87549a-a46e-4762-901d-d31a9b3c0d5c> | 3.40625 | 234 | Personal Blog | Science & Tech. | 23.551737 |
Learn more physics!
How can I prove to my boyfriend that lead is more dense than water? And I have forgotten how density is defined...molecules are closer together something something...?
- Andi (age 36)
Kansas City, MO
Get a lead brick and drop it into a bucket of water. If the brick sinks it is denser than water. If ... | <urn:uuid:40445d8d-9f21-4a6d-ab81-b231f4d489db> | 3.046875 | 188 | Q&A Forum | Science & Tech. | 81.173921 |
One of the biggest pieces of this argument has been that the RNA, which now helps DNA produce proteins, is too complex to arise from undirected chemical reactions. New research disproves this claim.
The new findings map out a series of simple, efficient chemical reactions that could have formed molecules of RNA, a clos... | <urn:uuid:25aa2390-022c-439b-bb65-19785c8d21c7> | 4.15625 | 429 | Personal Blog | Science & Tech. | 50.294295 |
The oceanic food chain begins with microscopic drifting plants called phytoplankton. Phytoplankton are found close to the surface of the water where there is adequate sunlight for photosynthesis.
Phytoplankton are eaten by tiny floating animals known as zooplankton. Zooplankton include the larvae of crabs, jellyfish, c... | <urn:uuid:00e4be8e-8a2a-49b8-8870-70b62ae20af4> | 3.9375 | 249 | Knowledge Article | Science & Tech. | 47.554796 |
|Where will the next Perseid meteor appear?
Sky enthusiasts who trekked outside for the Perseid meteor shower that peaked over the past few days
typically had this question on their mind.
Six meteors from this past weekend are
visible in the above stacked image composite, including one bright
fireball streaking along t... | <urn:uuid:30c84791-5d4e-4fe5-9661-da4c2f8f7dcc> | 2.734375 | 143 | Truncated | Science & Tech. | 41.561 |
FIGURE E1. Surface temperature anomalies (°C, top)
and surface temperature expressed as percentiles of the normal (Gaussian)
distribution fit to the 1971–2000 base period data (bottom).
Analysis is based on station data over land and on SST data over the
oceans (top). Anomalies for station data are departures from the ... | <urn:uuid:86b2a3c4-2c8a-4f6f-8709-a3a60cb31a38> | 3.03125 | 143 | Documentation | Science & Tech. | 43.451579 |
We hear about hurricanes every year, but how do hurricanes work? Most hurricanes that form in the Atlantic Ocean start as thunderstorms off the coast of Africa. As they travel across the tropical waters around the equator, they pick up moisture and energy, eventually crashing into land where they quickly fall apart.
Be... | <urn:uuid:646b4878-ebca-47ba-8139-d642561d449f> | 3.515625 | 402 | Personal Blog | Science & Tech. | 55.310482 |
Northcoast Regional Land Trust: Wood Creek Tidal Marsh Enhancement Project
The Northcoast Regional Land Trust (NCRLT) has worked to restore historical tidal flow and native vegetation to the Wood Creek Tidal Marsh. Over the past 150 years, this site has been altered by diking and removal of vegetation and large woody d... | <urn:uuid:34d68e8b-a24d-437c-95f2-5da2ae0189f2> | 2.859375 | 276 | Knowledge Article | Science & Tech. | 30.034385 |
Powering Remote Instrumentation in the Antarctic
The British Antarctic Survey often need to power remote instruments a long way from the nearest mains electricity connection!
These particular instruments are used to measure ozone. The ozone monitor draws around 5W when it is on, and the data is logged by a small, very ... | <urn:uuid:ae246d4c-cbff-4512-8234-aaea695eb444> | 3.140625 | 195 | Knowledge Article | Science & Tech. | 41.397273 |
Sea Level Rise News
Sea Level Rise
Sea level rise refers to the relatively recent net increase in Earth's ocean volume and depth, a trend that is widely attributed to rising global temperatures. While sea levels fluctuated dramatically in prehuman history, scientists link the past century's rapid rise at least partly t... | <urn:uuid:64ea727c-8b19-42ff-84e4-032e89ebf218> | 4 | 214 | Knowledge Article | Science & Tech. | 41.063394 |
00:00 11 March 2009
The burgeoning field of astrobiology has a less well-known offshoot right here on Earth: the search for a "shadow biosphere" - a second, independent form of life unrelated to the sort we know
Image 3 of 6
One promising avenue for discovering a new form of life is to look for "mirror life".
Normal or... | <urn:uuid:baf6e203-8252-4110-8a33-cd7e5b17205f> | 3.03125 | 168 | Truncated | Science & Tech. | 30.505357 |
Summary: Math 1550 Fall 2005
Section 31 P. Achar
Due: October 25, 2005
Suppose f(x) and g(x) are two functions whose derivatives you know. There are various ways to combine
them to get a new function. In class, we have developed various rules that tell us how to find the derivative
of the combined function in terms of ... | <urn:uuid:9067ff95-b199-411b-9ee9-39202f30c934> | 3.4375 | 179 | Academic Writing | Science & Tech. | 94.688659 |
Here are four different ways chemists use to show a molecule of hydrogen peroxide. In the colored molecule models, hydrogen is white and oxygen is red.
Click on image for full size
Windows to the Universe original artwork by Randy Russell.
Hydrogen Peroxide - H2O2
Hydrogen peroxide (H2O2) is a kind of chemical. A molec... | <urn:uuid:cdfab0ff-9e5c-4e7b-995a-0e7229c4ade3> | 3.84375 | 548 | Content Listing | Science & Tech. | 52.366326 |
STUDENT INSTRUCTION AND ANSWER
Activity 3: Concept
Application-Using The Drake Equation
= R x fp x ne x f1
x fi x fc x L
In Activity 2, we estimated the number of students that had particular
characteristics. In this activity, we will use the same estimation techniques
to discover the number of existing extraterrestria... | <urn:uuid:9212fdbf-14de-477d-9017-325d1b649bfa> | 3.65625 | 968 | Tutorial | Science & Tech. | 49.822209 |
In chemical thermodynamics, activity (symbol a) is a measure of the “effective concentration” of a species in a mixture, meaning that the species' chemical potential depends on the activity of a real solution in the same way that it would depend on concentration for an ideal solution.
By convention, activity is treated... | <urn:uuid:68adcc9f-3825-4e0d-b782-61287d5fe196> | 3.90625 | 2,628 | Knowledge Article | Science & Tech. | 34.558661 |
One more little side trip before we proceed with the differential geometry: Lie algebras. These are like “regular” associative algebras in that we take a module (often a vector space) and define a bilinear operation on it. This much is covered at the top of the post on algebras.
The difference is that instead of insist... | <urn:uuid:8b2044f9-7aa5-4b63-82bf-ddcb39ac8bec> | 2.828125 | 391 | Personal Blog | Science & Tech. | 31.102163 |