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Web Exclusives: Systems
Quick, do this math problem: 1,010 x 15,580.
Most of us would run for a calculator—or at least scrap paper and a pencil. Would you believe one answer is 6?
In 15,580 different situations, the bacterium E. coli and its 1,010 genes rely on just 6 basic ways to survive.
Why is this important?
Altho... | <urn:uuid:d51a50a9-57fa-4b29-9e91-075e16bc06d3> | 3.546875 | 322 | Knowledge Article | Science & Tech. | 53.209101 |
At T-0, the shuttle's twin solid rocket boosters ignite, and the spacecraft lifts off. About 10 minutes later, the astronauts are in a low orbit, traveling at 25 times the speed of sound and lapping the planet once every 90 minutes. The astronauts' destination -- the space station -- is circling some 240 miles (384 km)... | <urn:uuid:efba06dc-3f2f-4e9c-84f5-ee075b750fbc> | 3.421875 | 637 | Knowledge Article | Science & Tech. | 52.936019 |
This is Part Four of a six-part series telling the story of humankind's efforts to understand the origins of life and the potential for life on other worlds by studying organisms that survive deep below Earth's oceans around hydrothermal vents.
When the Voyager and Galileo spacecraft visited Jupiter's moons Io and Euro... | <urn:uuid:3c3b9975-2aed-4967-b971-5387fb240d02> | 4.21875 | 297 | Knowledge Article | Science & Tech. | 39.983102 |
Electric field strength is a quantitative expression of the intensity of an electric field at a particular location. The standard unit is the volt per meter (v/m or v · m -1 ). A field strength of 1 v/m represents a potential difference of one volt between points separated by one meter.
Any electrically charged object ... | <urn:uuid:8fe7e695-dec9-4ad0-89d5-ddad9119ca83> | 4.03125 | 492 | Knowledge Article | Science & Tech. | 50.475891 |
Who among us hasn’t spent some time gazing at the clouds? Perhaps we have lain in a grassy field or lawn and looked for shapes in the puffy white blobs that floated lazily across the blue expanse above. Or we watched the sky catch fire at the setting (or rising) of the day. For some, maybe the only relevance of clouds ... | <urn:uuid:8270b9e9-c3f0-454e-bc89-e8f703eabe9a> | 2.96875 | 1,081 | Personal Blog | Science & Tech. | 62.405349 |
Full name: light day
Plural form: light days
Alternate spelling: lightday
Category type: length
Scale factor: 25902068371200
The SI base unit for length is the metre.
1 metre is equal to 3.86069554627E-14 light day.
Valid units must be of the length type.
You can use this form to select from known units:
I'm feeling lu... | <urn:uuid:28e03bbe-a072-4c3d-9c29-8a4a1aa5fbd4> | 3.265625 | 222 | Structured Data | Science & Tech. | 71.914583 |
Titan is remarkable because it is the only known moon in the solar system that has a substantial atmosphere—largely nitrogen with a minor amount of methane and a rich variety of other hydrocarbons. Its surface is completely hidden from view (except at infrared and radio wavelengths) by a dense, hazy atmosphere.
The dia... | <urn:uuid:dbbec5f6-848e-47e8-ad6a-cb75d3a894b3> | 4.28125 | 263 | Knowledge Article | Science & Tech. | 43.385766 |
Astronomy Packet: 8
Assignment # 5
Final Project: Choose one of the following
1. Through a pair of binoculars observe the moons of Jupiter 15 nights in a row. Make precise drawings each night of the locations of each of the moons.
2. Chose an astronomy topic which we covered in this class. Study this topic in much more... | <urn:uuid:590aa02e-ccc3-4480-8a77-05c1f92c225a> | 3.671875 | 197 | Tutorial | Science & Tech. | 62.486267 |
If you are not a condensed matter physicist, vanadium oxide (VO2) may be the coolest material you’ve never heard of. It’s a metal. It’s an insulator. It’s a window coating and an optical switch. And thanks to a new study by physicists at Rice University, scientists have a new way to reversibly alter VO2′s electronic pr... | <urn:uuid:61cf9cb0-ea13-4d84-95ca-990db76be8ee> | 3.515625 | 1,003 | Truncated | Science & Tech. | 34.557173 |
Identification and distribution of simple and acylated betacyanins in the Amaranthaceae.
- PubMed: 11308355
Red-colored plants in the family Amaranthaceae are recognized as a rich source of diverse and unique betacyanins. The distribution of betacyanins in 37 species of 8 genera in the Amaranthaceae was investigated. A... | <urn:uuid:2222eda0-011a-4acd-bdd1-86ce90869c88> | 3.109375 | 369 | Academic Writing | Science & Tech. | 25.641581 |
Agarose gel electrophoresis
Agarose gel electrophoresis is used to separate DNA or RNA molecules by size. Nucleic acids are negatively charged and are moved through an agarose matrix by an electric field (electrophoresis). Shorter molecules move faster and migrate further.
- Cast a gel
- Place it in gel box in running ... | <urn:uuid:51f1a338-46c0-439e-ac4d-144144e9cc08> | 3.375 | 292 | Tutorial | Science & Tech. | 44.770023 |
What is sql?
SQL, which stands for Structured Query Language, is a special-purpose language used to define, access, and manipulate data. SQL is non procedural, meaning that it describes the necessary components and desired results without dictating exactly how results should be computed.
If you are facing any programmi... | <urn:uuid:ca272d56-35dc-42bd-8494-302306d21df9> | 2.703125 | 98 | Q&A Forum | Software Dev. | 43.6025 |
THL Toolbox > Developers' Zone > Web Development > Xml Markup in THL > Titles of Articles and Monographs
There are a several types of document titles that can possibly be encoded in the metadata of an XML essay. Titles are found listed within the teiHeader -> fileDesc -> titleStmt, along with the author's name. The tit... | <urn:uuid:678ef3ab-52a8-4a34-9192-97d8e09598a9> | 2.796875 | 604 | Documentation | Software Dev. | 54.5362 |
Water temperatures in the Trinity and Lower Klamath River are monitored to understand how well the dam releases met expected water temperature criteria.
Major findings from 2009 include:
- Spring water temperatures in the Trinity River generally fell within the “Optimal” or “Marginal” thermal regime for smolts, except ... | <urn:uuid:631db1f5-f55d-475e-88d1-373065ca48f6> | 3.125 | 731 | Knowledge Article | Science & Tech. | 41.894251 |
The movement of moisture or water vapor in the atmosphere is important in determining the weather. In the swirling motion of atmospheric water vapor, hurricanes can be seen. During the summer of 1995, a series of hurricanes formed off the coast of Africa -- Allison, Erin, Felix, Humberto, Iris, Luis, Marilyn, Noel, Opa... | <urn:uuid:9eaab9ab-1d3c-4a10-afee-1fb50d5a982c> | 3.6875 | 140 | Knowledge Article | Science & Tech. | 44.406667 |
Research project: Systematics of freshwater isopods (Phreatoicidea)
- Start date:
- Australian Biological Resources Study (ABRS)
Isopods in the suborder Phreatoicidea are found in surface streams, burrowing in the soil in moist areas, in yabbie burrows, in ground waters, and other hypogean waters. They have a fossil re... | <urn:uuid:d5ce9374-693d-4dc2-9b21-acee4385fd14> | 3.078125 | 184 | Academic Writing | Science & Tech. | 21.298168 |
Search Loci: Convergence:
There is more in Mersenne than in all the universities together.
In G. Simmons Calculus Gems, New York: McGraw Hill Inc., 1992.
Leonard Euler's Solution to the Konigsberg Bridge Problem
Euler's Proof, Part II
In Paragraph 6, Euler continues explaining the details of his method. He tells the re... | <urn:uuid:97410c97-5ebc-48d3-87d2-42d696d66a83> | 3.46875 | 769 | Academic Writing | Science & Tech. | 60.369795 |
Man searching for instruments to help him to calculate
Man has always searched for tools to help him count. As economical life developed, these tools became more and more necessary.
The early humans knew only three words to describe a counting result : 1,2 and 'a lot'. The latter meaning 'three' as well as any other nu... | <urn:uuid:e7403e06-bae8-4de8-a1c9-6b6a56513a11> | 3.59375 | 1,828 | Knowledge Article | Science & Tech. | 57.830921 |
I just have a quick question about time dilation/proper time because my physics book makes it a little confusing. Let's say we have an observer on Earth, and then an observer on a space ship. The space ship leaves Earth, flies to the Moon, and then returns to Earth. Who is the person measuring the proper time and why? ... | <urn:uuid:0f1bb56d-e341-4542-9acc-4b691f2a5212> | 2.9375 | 582 | Q&A Forum | Science & Tech. | 56.684866 |
Making Text Adventure Games in Ruby
Making a Text Adventure Game in Ruby
Text adventure games were a very popular game genre on minicomputers and microcomputers from the 1970's through the 1990's. This article series will take you through each step of making a text adventure game in Ruby.
One Tree to Rule Them All
Some... | <urn:uuid:bf59b49f-affa-4fc2-9218-3d81b006a5e4> | 2.96875 | 344 | Tutorial | Software Dev. | 46.725443 |
Revealing the True Solar Corona
Imaging may have inadvertently led astrophysicists astray in understanding the Sun
Sometimes seeing shouldn’t be believing. For 150 years, the solar corona has been studied by the use of images—including visual, photographic and processed. The assumption was that the observed variations ... | <urn:uuid:7a801a3d-7dfb-43b5-b655-96c1f5713edf> | 3.03125 | 145 | Truncated | Science & Tech. | 26.060435 |
Posted by Kate on Monday, May 5, 2008 at 12:31pm.
You must have a table in your text or in your lab manual that gives the solubility of some of the salts at various temperatures. . I assume this is an experiment you are conducting. KCl is rather soluble.
In the question above this one it says refer to a solubility char... | <urn:uuid:476ba663-0161-43f0-bd8f-5c4ea764bc91> | 3.3125 | 551 | Q&A Forum | Science & Tech. | 92.689599 |
Posted by navroz on Tuesday, January 3, 2012 at 2:12pm.
4+5+6+7 = 22
So, there would be
but why is the denominator 4!5!6!
If all the cookies were different, you'd have just 22! different ways. But, if you just consider the 4 chocolate chip cookies, they are indistinguishable from each other. If they were different, the... | <urn:uuid:ec51b523-46a1-4670-ac25-d97f7ced2e8f> | 3.109375 | 693 | Comment Section | Science & Tech. | 99.23128 |
GPR operates in the electrical conduction wavelength region of the electromagnetic spectrum. Whereas seismic response is a function of acoustic properties, GPR response is a function of the electromagnetic properties: dielectric permittivity , magnetic permeability , and electrical conductivity . Dielectric permittivit... | <urn:uuid:0927bd7c-55c4-488f-a904-f241738f293f> | 3.671875 | 1,726 | Academic Writing | Science & Tech. | 30.196233 |
Voltage-gated ion channels open and close in response to changes in the electric environment of the membrane. This is achieved though a voltage sensor that detects voltage by use of key charged elements or “gating charges”. Changes in membrane potential cause motion of the gating charges thus inducing conformational ch... | <urn:uuid:c37d4fab-ed30-478c-85d3-4eedec65c8a9> | 3.078125 | 984 | Knowledge Article | Science & Tech. | 42.519498 |
Welcome to part 3 of my 10 part series on PHP. In the first
two parts I introduced you to the language and to what
software you needed to run it.
In this episode we will look at some simple PHP syntax, and
we'll write a couple of small scripts to get our feet wet,
and get a feel for the language.
What does a PHP script... | <urn:uuid:dd20d9af-0ee8-4c3e-9509-fedf3c3beba0> | 3.234375 | 878 | Truncated | Software Dev. | 54.03834 |
Electric Potential Difference
Visit The Physics Classroom's Flickr Galleries and enjoy a photo overview of the topic of electric circuits.
Learning requires action. Give your students this sense-making activity from The Curriculum Corner.Cirque du Circuit: A Unit on Electric Circuits for High School Physics
This is a 1... | <urn:uuid:6cb91733-cc31-4b4f-a278-b41cdcc993f2> | 4.1875 | 1,735 | Tutorial | Science & Tech. | 38.82064 |
|Jan3-13, 09:33 AM||#1|
Charge distribution over a solid conductor
I was watching a video on the internet about charge distributions over solid conductors. The solid conductor was heart shaped which was positively charged. The lecturer in the video said that when you touched this conductor, the charge would distribute ... | <urn:uuid:33916c4a-1ffe-43ca-b8a6-cce7cc009169> | 3 | 393 | Comment Section | Science & Tech. | 50.681005 |
The Banded Coral Shrimp is a common reef creature. We have seen Banded Coral Shrimp near several Caribbean islands, including Bimini and Bonaire.
The Banded Coral Shrimp is a cleaner. That is, the Banded Coral Shrimp spends a lot of its time cleaning fish. This shrimp will find a place to sit on the coral reef and wait... | <urn:uuid:d50034b6-3497-4173-98db-249245887056> | 3.234375 | 433 | Knowledge Article | Science & Tech. | 70.15903 |
Asteroid Belts Could Be Key to Finding Alien Life
- 11:16 AM
- Categories: Space
By Ian Steadman, Wired UK
If we want to find intelligent life elsewhere in the universe, it might be wise to look for stars with asteroid belts similar the one in our own Solar System.
According to the theory of punctuated equilibrium, evo... | <urn:uuid:abcce538-5526-4c4a-a0fe-8ed18023629f> | 3.53125 | 864 | Truncated | Science & Tech. | 27.099419 |
Solar Eclipse and a
Lunar Eclipse are rare and very dramatic events. Even
if these eclipses are partial, it is still worth a
look. An eclipse occurs when the
Moon comes between
Earth and the
Sun (Solar Eclipse), and when the
Moon (Lunar Eclipse).
Because the Moon is much smaller than the Earth, Solar Eclipses are more ... | <urn:uuid:b32f4e77-0d4b-47c0-a548-a7da1f57653b> | 3.40625 | 303 | Knowledge Article | Science & Tech. | 40.255632 |
Have any experiments been carried out involving sprouting and growing plants in a zero gravity environment? If so, what was the outcome? How did the plants sprout out of the soil without gravity? Did they grow outward or toward light sources?
There have been several experiments in growing plants in microgravity (strict... | <urn:uuid:1280f048-6ae0-4ece-96c3-3b17142b840f> | 3.59375 | 835 | Q&A Forum | Science & Tech. | 67.012657 |
in the constellation Aquila
14 times the mass of the Sun
Diameter roughly 50 miles (85 km) equal to the size of a large city
Measuring the motions of a companion star
Because a black hole is both massive and compact, it exerts a strong gravitational pull on the material around it. Astronomers can deduce the presence of... | <urn:uuid:4dfb37f9-96f9-436c-987a-ef16c92dd090> | 3.875 | 288 | Knowledge Article | Science & Tech. | 40.922894 |
What does symmetry have to do with physics?
As my ultimate goal is talk about physics, it's time for a paragraph on that subject, just so we don't lose sight of where we're going. So imagine a game of pool. Pool is a game of physics, the outcome of any play depends on factors such as friction, collision angles, the coe... | <urn:uuid:a0f46b7e-4189-4dab-87d3-2793e7950d26> | 2.859375 | 2,506 | Personal Blog | Science & Tech. | 62.531743 |
Population growth rates of reef sharks with and without fishing on the Great Barrier Reef: robust estimation with multiple models
Hisano, Mizue, Connolly, Sean R., and Robbins, William D. (2011) Population growth rates of reef sharks with and without fishing on the Great Barrier Reef: robust estimation with multiple mo... | <urn:uuid:4f55d3be-584c-4d74-8e39-f84354cb3731> | 2.75 | 708 | Academic Writing | Science & Tech. | 21.072102 |
I don’t know much about physics but an electrical enthusiast. In simple terms ignoring maths here what is plasma exactly? Is a corona a type of plasma involved with electromagnetic radiation? As you can probably see I’m clueless. Some simple explanation to understand the basics would be appreciated. Thanks.
Plasma has ... | <urn:uuid:c8b7b971-e9bb-4ad1-8434-e71607282c27> | 3.09375 | 334 | Q&A Forum | Science & Tech. | 59.537834 |
Photo: Chad Horwedel (flickr)
Maybe you remember those old westerns where some outlaw is being chased by a posse, and in order to escape, he lies down in shallow water and breathes through a hollow reed. The posse, befuddled, rides on by.
Unfortunately, this trick doesn’t actually work. A little physics keeps getting i... | <urn:uuid:4b32e1da-a65b-4a34-9f51-fbf48fd0f36d> | 3.109375 | 359 | Knowledge Article | Science & Tech. | 55.110131 |
Any name that appears in a function's argument list, or any name that is set to a value anywhere in the function, is said to be local to the function. If a local name is the same as a name from outside the function (a so-called global name), references to that name inside the function will refer to the local name, and ... | <urn:uuid:9a3dbc44-63e4-49b8-8880-5c4bb5dbf568> | 3.5625 | 171 | Documentation | Software Dev. | 64.761735 |
Referred to as typhoons in the Pacific, hurricanes in the Atlantic, and tropical cyclones by meteorologists these intensely powerful storms claim more lives each year than any other kind of storm. They can uproot trees, tear houses off of their foundations, and throw cars around like they were toys. It is not unusual f... | <urn:uuid:0ee75a35-c338-4ec5-8cd0-08278d81d4b6> | 4.0625 | 492 | Knowledge Article | Science & Tech. | 62.141131 |
Does managed coastal realignment create saltmarshes with ‘equivalent biological characteristics’ to natural reference sites?
Article first published online: 19 SEP 2012
© 2012 The Authors. Journal of Applied Ecology © 2012 British Ecological Society
Journal of Applied Ecology
Volume 49, Issue 6, pages 1446–1456, Decemb... | <urn:uuid:e1ffbcc2-d0dc-41b9-8115-c94feba362a6> | 2.71875 | 694 | Academic Writing | Science & Tech. | 21.320675 |
APS/S. Benjamin and J. Smith
Lower right: Structurally, the NV center consists of a pair of adjacent defects in the diamond lattice, namely, a nitrogen atom substituting for a carbon, together with a vacancy (a missing atom). Main figure: In abstract terms, each NV center is composed of at least one nuclear spin, and a... | <urn:uuid:cdb72aa2-02fd-4aa0-8467-e76f18314261> | 3.078125 | 120 | Knowledge Article | Science & Tech. | 50.1025 |
Please read my blog on ‘TIME-a Non Linear Theory’ to know of the full implications.
Stephen Hawking has said: “We should look for evidence of a collision with another universe in our distant Past.” Some experts believe that what we call the universe may only be one of many. Is there any conceivable way that we could ev... | <urn:uuid:7180cd55-64e3-4b8e-9759-5052d94f4dfe> | 3.109375 | 1,314 | Personal Blog | Science & Tech. | 32.595874 |
Power series supply us with a new way to describe functions: we can specify the coefficients of each power in the series. This raises the following questions.
Given a function defined previously, what does its power series look like?
What do the terms of the power series tell us about the function?
A standard power ser... | <urn:uuid:67b735d2-88ea-4a39-90f8-a4c4115852da> | 3.75 | 667 | Tutorial | Science & Tech. | 73.206311 |
Number of Chains (Asymmetric Unit)
Search for structures based on the number of chains in the asymmetric unit.
The asymmetric unit is the smallest portion of a crystal structure to which symmetry operations can be applied in order to generate the complete unit cell (the smallest repeating unit of a crystal). This conce... | <urn:uuid:9f4b0e28-e556-4807-9831-e02849f0ee0d> | 3.5 | 253 | Tutorial | Science & Tech. | 47.605668 |
Roger Pielke Sr. (Colorado State) has a blog (Climate Science) that gives his personal perspective on climate change issues. In it, he has made clear that he feels that apart from greenhouse gases, other climate forcings (the changes that affect the energy balance of the planet) are being neglected in the scientific di... | <urn:uuid:8ba9bd25-df20-4b69-91a9-3fe4fe1e16f6> | 2.921875 | 1,904 | Comment Section | Science & Tech. | 49.901898 |
What Is a Theory Anyway?
Scientists use the word theory differently than nonscientists. "It’s just a theory," you hear people say. When speaking casually, people often use the word "theory" to mean a "guess" or a "feeling". In science, a theory means much more.
In science, theories are explanations of aspects of nature... | <urn:uuid:23fef12a-7d05-4073-a381-d22a37ee1880> | 3.75 | 523 | Knowledge Article | Science & Tech. | 32.435412 |
Hi! Thanks for such an interesting question.
This is what is called by some as an example for the Coriolis force
BUT according to most experts THIS DOES NOT APPLY to the explanation
of the rotation of water draining in your sink.
?Don't believe what you hear about Coriolis making the water in a sink
or toilet rotate on... | <urn:uuid:37f04562-c1ca-480d-901e-d714afe0ca18> | 3.40625 | 1,382 | Q&A Forum | Science & Tech. | 50.001063 |
What is “windows” header file ?
December 2, 2012 2 Comments
When I look back at my initial days of programming I can feel myself smiling over little, though unintentional but silly mistakes that I used to make and an even bigger smile comes when I think about the misconceptions I had in those days. No doubt they are al... | <urn:uuid:f714003e-cd4b-49b5-8812-a8e6bf9a118d> | 2.921875 | 742 | Personal Blog | Software Dev. | 56.514301 |
||This article may require cleanup to meet Wikipedia's quality standards. (October 2010)|
Condensation is the change of the physical state of matter from gaseous phase into liquid phase, and is the reverse of vaporization. When the transition happens from the gaseous phase into the solid phase directly, the change is c... | <urn:uuid:2159b2e4-c55d-425c-a5dc-e0205e238673> | 3.953125 | 723 | Knowledge Article | Science & Tech. | 20.853914 |
(Submitted November 07, 1996)
Is it possible that the Sun could just burn out?
What manages to keep the Sun so hot all of the time?
The Sun is basically a thermonuclear bomb with a built-in thermostat. Just
as in a hydrogen bomb, hydrogen atoms are fusing together to make helium atoms
and this nuclear reaction produces... | <urn:uuid:af064280-db0f-4af0-b19a-b99b36822bad> | 3.75 | 271 | Q&A Forum | Science & Tech. | 69.919038 |
5.8. Vacuum Fluctuations and Perturbations
Recall that the structures - clusters and superclusters of galaxies - we see on the largest scales in the universe today, and hence the observed fluctuations in the CMB, form from the gravitational instability of initial perturbations in the matter density. The origin of these... | <urn:uuid:70f4cd9a-d14d-4270-9a04-d6590baac7ed> | 3.359375 | 1,130 | Academic Writing | Science & Tech. | 25.567577 |
Two different methods of geochronology allow geologists to date small quantities of minerals:
The 1st one uses the radioactive decay of the natural Potassium 40, obtained from the ratio K40/K39. The reactor neutrons are utilised to transform Potassium into Argon, and then the ratio Ar40/Ar39 is measured
The 2nd one is ... | <urn:uuid:1cabd77f-914c-474e-8fb9-1b75efe3c3b5> | 3.21875 | 127 | Knowledge Article | Science & Tech. | 28.229084 |
Nov 01 2010
Intro to Environmental Systems and Ecosystem Ecology
Most of our prior studies have been focused on the components that make up our world, but, in reality, the world isn’t made up of individual components, but rather of one complex whole. While categories are useful to understand subject matter, the planet ... | <urn:uuid:2a9f5817-d1ad-43f2-8bea-91dee61746ad> | 3.203125 | 254 | Personal Blog | Science & Tech. | 45.020814 |
Suzaku (formerly Astro-E2)
Launch Date: July 10, 2005
Mission Project Home Page - http://heasarc.gsfc.nasa.gov/docs/astroe/astroegof.html
Suzaku, formerly known as NeXT, is Japan's fifth X-ray astronomy mission, and was developed at the Institute of Space and Astronautical Science of Japan Aerospace Exploration Agency ... | <urn:uuid:8676c043-8b9e-433b-a8ab-805e529bb539> | 2.84375 | 600 | Knowledge Article | Science & Tech. | 48.883027 |
Astonishing Science. Spectacular museum.
A European Space Agency project has its sights set high – taking materials science into space. Experiments carried out on board space-bound rockets are helping scientists develop the materials of the future. These two new types of material are intermetallics – compounds of metal... | <urn:uuid:674a2189-6d41-4c2a-9539-7f6c3ad31a0a> | 4.09375 | 587 | Knowledge Article | Science & Tech. | 29.365161 |
hash_hmac function takes binary input, i.e. strings made of raw bytes. Character encoding should not come into play at all.
For example, if you were to use SHA256 to compute the HMAC key, from a password, you'd do something like this:
// second parameter selects raw bytes or ASCII hex for output (false = hex, true = ra... | <urn:uuid:d926e335-ae02-48e5-8035-0e21809f6ef9> | 2.84375 | 285 | Q&A Forum | Software Dev. | 56.404455 |
The Search for QCD Exotics
Particles predicted by the theory of quantum chromodynamics help explain why the fundamental building blocks of matter are impossible to isolate
Protons in the nuclei of atoms would fly apart were it not for the strong nuclear force. This force is carried by particles (called "gluons") just a... | <urn:uuid:3cb2f8df-8935-4cb6-b5f4-dcf451770582> | 3.703125 | 206 | Truncated | Science & Tech. | 30.579441 |
Trees have extreme longevity: bristlecone pine
Bristlecone pines can survive for thousands of years in harsh environments by shutting down non-essential processes.
|Biomimetic Application Ideas|
> Visit strategy page
"Bristlecone pines receive very little water and food throughout the year…and the trees stand on dolomi... | <urn:uuid:36d5764f-1fa0-4280-86ae-c0109a5ebbe4> | 3.09375 | 252 | Knowledge Article | Science & Tech. | 28.3832 |
The Sahara Forest Project combines two proven technologies in a new way to create multiple benefits: producing large amounts of renewable energy, food and water as well as reversing desertification. A major element of the proposal is the Seawater Greenhouse; a brilliant invention that creates a cool growing environment... | <urn:uuid:ba9d2157-2f14-4e65-8647-5741944360cd> | 3.71875 | 1,144 | Personal Blog | Science & Tech. | 35.090095 |
Unit tests are supplementary source code created to automatically test the functionality and correctness of code modules. They are a way of formalizing assumptions about the code’s behavior. With unit tests, one can validate code and code changes at any time, and know exactly when a new change breaks existing code.
Thi... | <urn:uuid:d08a73e2-52d5-4dfa-9fd6-3f272c5d52b0> | 3.21875 | 1,392 | Documentation | Software Dev. | 57.957333 |
Category: Science in Action
Subject(s): Astronomy/Space Science
Keywords: hubble space telescope, origins of the universe, cosmology, nebula, galaxy, stars, big bang, nasa, space shuttle, space telescope science institute, goddard space flight center, universe, astronomers, kathryn gaulke, goddard space flight center c... | <urn:uuid:d9f1ec67-a697-4a28-84de-29b84305a6fc> | 3.15625 | 288 | Content Listing | Science & Tech. | 59.593593 |
Actinopterygii (ray-finned fishes) > Tetraodontiformes
(Puffers and filefishes) > Tetraodontidae
Etymology: Takifugu: A Japanese word with several meanings; taki = waterfall + fugu = fish; it could be also understood as taki = to be cooked in liquid + fugu = a venomous fish.
Environment / Climate / Range
Marine; demers... | <urn:uuid:28d3bd48-28e8-4319-82a8-7f617f4ef5d0> | 3.046875 | 548 | Knowledge Article | Science & Tech. | 52.467004 |
Life-forms We Can’t Live Without
Plants are one of two major Kingdoms of
life forms. There are about 300,000 plant species on
Earth. Plants are the only life forms that can produce their own food using
energy from sunlight. Plants produce almost all of the oxygen in
the air that humans and other animals breathe. Plants... | <urn:uuid:96d99963-841a-4149-b920-e7ea615abaf0> | 3.890625 | 2,016 | Knowledge Article | Science & Tech. | 61.760808 |
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Weather Almanac for May 2007
THE SMELLS OF WEATHER
Ahhh, May. With luck, the April showers have brought an outbreak of May flowers. My favourite Spring aroma is the smell of lilacs in bloom. The airs, h... | <urn:uuid:1cd08750-e01f-42f7-a9ac-f90e120bec0d> | 2.703125 | 1,357 | Nonfiction Writing | Science & Tech. | 45.934973 |
Counterintuitive Examples and Discrepant Events
- Diluting a weak electrolyte (HC2H3O2) with water increases the
electrical conductivity. (See Suggested Laboratory Activity, Strong vs.
- Carbon dioxide bubbled through limewater causes a precipitate to form.
Continued bubbling causes the precipitate to disappear. (See U... | <urn:uuid:48329d62-ce0a-4c74-89e0-37cde56cf8e2> | 3.890625 | 418 | Content Listing | Science & Tech. | 42.658627 |
Most VB6 procedures—subs and functions—take a fixed number of arguments. The arguments and their types are specified in the procedure definition and, when the procedure is called, the arguments that are passed must precisely match the definition. In some situations, you may want to define one or more optional arguments... | <urn:uuid:d0d2e63a-6542-41d2-9d2d-f9accb9486fb> | 3.5 | 294 | Tutorial | Software Dev. | 41.802272 |
This first image shows CONTOUR breezing past a comet nucleus (artist's rendition). The second image is a picture of all of the orbits involved. It shows how CONTOUR will be able to intersect the paths of the three comets.
Images Courtesy of NASA
The COmet Nucleus TOUR (CONTOUR) will be launched in 2002. The spacecraft ... | <urn:uuid:7eba25c4-a557-4b73-81ae-bfee764cebee> | 3.734375 | 399 | Content Listing | Science & Tech. | 65.850495 |
Optical science and engineering affect almost every aspect of our lives. Millions of miles of optical fiber carry voice and data signals around the world. Lasers are used in surgery of the retina, kidneys, and heart. New high-efficiency light sources promise dramatic reductions in electricity consumption. Night-vision ... | <urn:uuid:56fed92c-13c8-4c33-87c4-36bbd906042d> | 2.984375 | 134 | Content Listing | Science & Tech. | 23.562308 |
The Collatz Conjecture is one of the Unsolved problems in mathematics, specially in Number Theory. The Collatz Conjecture is also termed as 3n+1 conjecture, Ulam Conjecture, Kakutani’s Problem, Thwaites Conjecture, Hasse’s Algorithm, Syracuse Problem.
If you keep repeating this procedure, you shall reach the number 1 a... | <urn:uuid:cbb75eb4-a124-41e8-b4dd-5c49a5e7a0b4> | 2.921875 | 459 | Knowledge Article | Science & Tech. | 58.95913 |
This experiment involves the synthesis and characterization of a simple porphyrin: 5,10,15,20-tetraphenylporphyrin. This product is a structural analog of important biomolecules, such as the heme portion of the oxygen-transport molecule hemoglobin and chlorophyll of plants.
The carbon skeleton of the porphyrin ring is ... | <urn:uuid:46c7cd9e-d98b-45bd-96e1-e20ee93c3c17> | 3.3125 | 336 | Knowledge Article | Science & Tech. | 22.051264 |
The two chimpanzee flights in Project Mercury were to reveal significant medical data. The suborbital flight of Ham was without complications, but it was considerably less complex than Enosí orbital flight.
In the Mercury-Atlas 5 (MA-5) orbital flight, Enos performed a complex
multiple operant task as lie twice orbited... | <urn:uuid:3d7c45f6-990d-4b27-b21a-ca776368097a> | 3 | 573 | Academic Writing | Science & Tech. | 48.760774 |
The closer we come to inventing a viable tractor beam - a ray of light that can move objects - the more obvious it is that real tractor beams will not look anything like the glowing blue rays from science fiction. So how will beams of light actually move matter? Let's find out by looking at three ways that scientists c... | <urn:uuid:942cb32d-90b3-492e-8cce-1bc8f2b92019> | 4.4375 | 1,061 | Listicle | Science & Tech. | 42.458551 |
Section 4: Gravitational and Inertial Mass
A subtlety arises when we compare the law of universal gravitation with Newton's second law of motion. The mass that appears in the law of universal gravitation is the property of the particle that creates the gravitational force acting on the other particle; for if we double ... | <urn:uuid:95772f40-7029-4e1b-87e7-a3d322586f98> | 4.1875 | 991 | Tutorial | Science & Tech. | 40.034772 |
Cosmologists can now proclaim with confidence (but with some surprise too) that, in round numbers, our universe consists of 5% baryons, 25% dark matter, and 70% dark energy. It is indeed embarrassing that 95% of the universe is unaccounted for: even the dark matter is of quite uncertain nature, and the dark energy is a... | <urn:uuid:a9fd252a-1c4a-48cc-9299-0518df8ff9d9> | 2.890625 | 865 | Academic Writing | Science & Tech. | 27.455701 |
A few more facts about group actions
There’s another thing I should have mentioned before. When a group acts on a set , there is a bijection between the orbit of a point and the set of cosets of in . In fact, if and only if if and only if is in if and only if . This is the the bijection we need.
This has a few immediat... | <urn:uuid:18735377-4c33-4313-8f17-44bb49f2ff03> | 3.359375 | 413 | Personal Blog | Science & Tech. | 61.304799 |
Friday 17 May
Ivell’s sea anemone (Edwardsia ivelli)
Ivell’s sea anemone fact file
- Find out more
- Print factsheet
Ivell’s sea anemone description
A simple animal, the sea anemone is made up of a column with a mouth, used to take in food and expel waste, and several tentacles. In Ivell’s sea anemone, there are twelve... | <urn:uuid:852e1c27-3eed-4ce3-861c-c98905285f47> | 3.6875 | 1,325 | Knowledge Article | Science & Tech. | 26.59774 |
Rovers on wheels
NASA’s four martian rovers all took engineering inspiration from the Soviet Union’s 1970s Moon missions.
June 25, 2012
|The engineering origins of NASA’s Mars rovers lie in the Soviet Union’s Moon exploration program, part of its competition with the United States in the 1960s and 1970s.|
Astronomy mag... | <urn:uuid:872951a4-de15-44ad-8974-9ee397c2e7ce> | 3.28125 | 265 | Truncated | Science & Tech. | 45.232632 |
The wildfires that make the news are vilified for good reason. These out-of-control burns pose threats to people’s lives and property. Often, they are also dangerous to natural ecosystems. Though some of these fires are caused by arson or by careless people, others occur because of the inevitable build-up of plants in ... | <urn:uuid:194b8d09-a971-4a49-b6f8-a43fedef851f> | 3.890625 | 374 | Personal Blog | Science & Tech. | 41.150956 |
Common Lisp the Language, 2nd Edition
A string is simply a vector of characters. More precisely, a string is a specialized vector whose elements are of type string-char.
X3J13 voted in March 1989 (CHARACTER-PROPOSAL) to eliminate the type string-char and to redefine the type string to be the union of one or more specia... | <urn:uuid:ef3febb8-9c86-43f4-a924-68a9f4e1891a> | 4.09375 | 478 | Documentation | Software Dev. | 42.787253 |
The Echinoderms lack a head and have five-point radial symmetry. These fascinating animals live only in marine environments. They have an endoskeleton made out of calcareous plates, which is often protected by spines. The plates that make up the endoskeleton often support the spines and enclose the coelom, an anatomica... | <urn:uuid:1cc80200-0164-4a50-8b33-1d6f742d659d> | 4.125 | 1,332 | Knowledge Article | Science & Tech. | 35.719999 |
Gray Reef Sharks, Carcharhinus amblyrhynchos
Taxonomy Animalia Chordata Elasmobranchii Carcharhiniformes Carcharhinidae Carcharhinus amblyrhynchos
Description & Behavior
Gray reef sharks, Carcharhinus amblyrhynchos (Bleeker, 1856), aka grey reef sharks, blacktail reef sharks, bronze whalers, shortnose blacktail sharks,... | <urn:uuid:b458ebf5-3e38-4dee-b5a5-729ce5f5fa9a> | 3.28125 | 1,353 | Knowledge Article | Science & Tech. | 40.195678 |
Fred Pearce, consultant
The future might be bright if solar power takes off around the world (Image: Donkeysoho/Plainpicture)
Project Sunshine by Steve McKevitt and Tony Ryan shows the great promise of solar power, but time is running out for its advocates to make it shine
WE ARE stardust. And ultimately the energy tha... | <urn:uuid:03f384dc-a00c-4b34-8275-8ca8074d2bd4> | 3.46875 | 1,022 | Nonfiction Writing | Science & Tech. | 49.883285 |
is a leader in DOE studies of carbon sequestration.
in Carbon Storage Studies
The quantity of carbon in the earth's atmosphere currently 780 billion tons has been rising by roughly 3.3 billion tons per year over the past 10 years. Three approaches are being considered in an attempt to reduce the buildup of carbon dioxi... | <urn:uuid:91c344bb-b491-48a0-9ba9-576f9277676d> | 3.359375 | 905 | Knowledge Article | Science & Tech. | 25.120552 |
Planetary and Satellite Motion
Need to see it? View the Satellite Motion animation from the Multimedia Physics Studios.PhET: Gravity and Orbits
Explore satellite motion with this interactive Java applet from PhET. View the orbit of moons and planets or both simultaneously.Flickr Physics
Visit The Physics Classroom's Fl... | <urn:uuid:ec357a72-328d-42cb-b8fc-683bcb870b35> | 3.015625 | 1,715 | Tutorial | Science & Tech. | 40.757427 |
How to convert watts to joules
You can calculate joules from watts and seconds, but you can't convert watts to joules since watt and joule units represent different quantities.
Watts to joules calculation formula
The energy E in joules (J) is equal to the power P in watts (W), times the time period t in seconds (s):
E(... | <urn:uuid:06a6e47f-dfd9-4553-8c65-08da402542c1> | 3.03125 | 149 | Tutorial | Science & Tech. | 46.842552 |
This image shows the rock called "Souffle".
Click on image for full size
Image from: NASA/JPL
Martian Surface Winds
The surface pressure of Mars is about 1/150th that of the surface pressure of the Earth. This means that there are much fewer molecules in the atmosphere. This means that the atmosphere near the surface o... | <urn:uuid:f7c2a2a7-4971-4663-9d14-81b6d72c284d> | 4.3125 | 731 | Content Listing | Science & Tech. | 59.632033 |
Artículos con la etiqueta Physics
From envying comic book characters to pondering extra dimensions while staring at fish, Dr. Michio Kaku recounts the experiences that made him one of the world's most colorful scientists.
Propelling a spaceship with photons would be like trying to energize a spaceship with a flashlight... | <urn:uuid:4c340943-9eea-477a-9a8c-e641ad82ee98> | 2.765625 | 695 | Content Listing | Science & Tech. | 41.892689 |
Word "environment" is most commonly used describing "natural" environment and means the sum of all living and non-living things that surround an organism, or group of organisms. Environment includes all elements, factors , and conditions that have some impact on growth and development of certain organism. Environment i... | <urn:uuid:5d2b13c5-0a50-41f8-bcd7-29b5b8c219e6> | 3.59375 | 634 | Personal Blog | Science & Tech. | 28.33426 |
Here's how I prefer to think about it. Consider the implementation of a variable containing a 32 bit integer. When treated as a value type, the entire value fits into 32 bits of storage. That's what a value type is: the storage contains just the bits that make up the value, nothing more, nothing less.
Now consider the ... | <urn:uuid:b067f96d-6c08-42be-95c2-1b15846f7c9e> | 2.6875 | 382 | Q&A Forum | Software Dev. | 55.687247 |
The latest in science and technology news
|By MARK OLLIG|
Where can you learn about gold nanorods that are 1,000 times smaller than a human hair?
What website tells you about the highly sensitive optical sensors, super lenses, and “invisible objects” for use in the military?
Do you want to be on the “cutting edge” and ... | <urn:uuid:6e4d5f96-fbee-4876-a9e6-53443610ef0a> | 2.921875 | 1,262 | Personal Blog | Science & Tech. | 58.189585 |
Scientific Investigations Report 2012–5179
As part of the U.S. Department of the Interior sustainable water strategy, WaterSMART, the U.S. Geological Survey documented hydrologic and water-quality conditions in the lower Apalachicola–Chattahoochee–Flint and western and central Aucilla–Suwanee–Ochlockonee River basins i... | <urn:uuid:8f98f49e-33fd-46ae-8da2-72d00448cbaa> | 3.078125 | 822 | Academic Writing | Science & Tech. | 42.896327 |
Last week, the European Commission announced the investment of 1bn Euros (1,000,000,000€) in graphene research and its development as a new material. It was great news for science and I wanted to know more about this new material that was all over the media.
Graphene is a one-atom-thick sheet made of carbon atoms arran... | <urn:uuid:5931e3f7-f42c-4f6b-bdcd-6bdb915efd07> | 3.609375 | 746 | Personal Blog | Science & Tech. | 45.722574 |
This summer, the Arctic lost an area of sea ice equivalent to the state of Maine every day for a month. When the meltback was over in September, the Arctic shed an area of ice the size of Canada and Texas combined — a 40 percent decline over the historical average.
And just last month, scientists reported that the pace... | <urn:uuid:aad7e891-f7a5-4596-955a-3c039a7299d6> | 2.875 | 1,002 | Audio Transcript | Science & Tech. | 49.77241 |
(part of ZopeInAnger)
Forget those explanations about patterns. And forget about Python classes.
Interfaces are a Zope 3 invention mainly to:
- Allow the exposing of an API (every component has an external interface)
- Allow the Zope 3 machinery to query the interface
Interfaces can be queried by Zope 3 so when they ar... | <urn:uuid:48fc963e-ad1b-4537-b9e6-85abcef81dab> | 2.96875 | 1,138 | Documentation | Software Dev. | 29.735312 |
READ CHAPTERS 5,6,7
STUDY ALL VOCABULARY TERMS
- Know how to do relative humidity problems.
- Know how to do orographic uplift problems.
- Know the location of all wind and pressure belts.
- Know all measures of standard atmospheric pressure at sea level.
- Does air pressure increase or decrease with increased elevatio... | <urn:uuid:ec70bfa3-527f-4a74-bc39-e6d85c2738ad> | 3.921875 | 492 | Content Listing | Science & Tech. | 51.852268 |
http://www.nature.com/nature/journal/v4 ... 10343.html
Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation
Atmospheric aerosols exert an important influence on climate1 through their effects on stratiform cloud albedo and lifetime2 and the invigoration of convective storms3. Model... | <urn:uuid:12a4ce5d-8da8-43f2-a8aa-198617eb61a2> | 2.859375 | 379 | Comment Section | Science & Tech. | 24.871758 |
An old adage explains the difference between climate and weather; "Climate is what you expect, weather is what you get." Climatology is the analysis of general weather patterns over a long period of time. For example, The World Meteorological Organization (WMO) specifies the period for climate analysis to be thirty yea... | <urn:uuid:2ea36eae-83f5-4d8d-bc71-c7390042862e> | 3.640625 | 630 | Knowledge Article | Science & Tech. | 24.851862 |
Look up monthly U.S., Statewide, Divisional, and Regional Temperature, Precipitation, Degree Days, and Palmer (Drought) rankings for 1-12, 18, 24, 36, 48, 60-month, and Year-to-Date time periods. Data and statistics are as of January 1895.
Please note, Degree Days are not available for Agricultural Belts
Contiguous U.S... | <urn:uuid:a06f7d40-5cfa-4410-ab02-1c6951255e8f> | 2.859375 | 139 | Structured Data | Science & Tech. | 58.063077 |
User:Emran M. Qassem/Balmer
In this lab we measured the Rydberg constant for Hydrogen and Deuterium using a spectrometer and compared them with each other and the accepted value of the Rydberg constant.
To do this we used a spectrometer which we first calibrated with a mercury gas tube and the known wavelengths of the ... | <urn:uuid:89cb8804-b5b8-450a-9519-3dce97bdc298> | 3.046875 | 374 | Audio Transcript | Science & Tech. | 49.027466 |
- Almost always has something to do with strings or matching
~ As a prefix operator, coerces to subtype Str (string)
~ As an infix operator: concatinate or stitch characters together, instead of . in perl5. Specification
Operators containing this character
$~ not an operator, but a twigil for a slang
~^ ~| ~& bitwise l... | <urn:uuid:f81ea435-fc32-43c4-b145-61ccd9fcdd44> | 3.71875 | 271 | Structured Data | Software Dev. | 44.087143 |