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Two special cases arise frequently in whichthe laws of signs may be used to advantage. The first such usage is in simplifying subtraction; the second is in changing the signs of the numerator and denominator when division is indicated in the form of a fraction.
The rules for subtraction may be simplifiedby use of the l... | <urn:uuid:0d7174c3-65cc-4b06-8b08-dc8875fbe010> | 4.21875 | 1,896 | Knowledge Article | Science & Tech. | 55.46472 |
What will happen to the Solar System?
Scientists believe that stars do not always remain the same. We believe our Sun and our solar system was formed by the collapse of a cloud of gas and dust in space 4.6 billion years ago. The Sun is now a middle aged star, with 9 planets and many other bodies near it in the solar sy... | <urn:uuid:d8ff5302-1218-4690-83be-5bdb8abd06ff> | 3.578125 | 540 | Content Listing | Science & Tech. | 63.787938 |
Compound expressions, conditional expressions and casts are allowed as lvalues provided their operands are lvalues. This means that you can take their addresses or store values into them.
Standard C++ allows compound expressions and conditional expressions as lvalues, and permits casts to reference type, so use of this... | <urn:uuid:71a7eb39-c888-4e84-9237-7aa177a10af7> | 3.984375 | 530 | Documentation | Software Dev. | 54.575186 |
The understanding that light interacts with matter like a particle also lead to modern information technology, like computers, TVs, and lasers. The communicator is a direct example of the Photo-Electric Effect, one of Einsteinís groundbreaking 1905 theses. This is the achievement for which he won the Noble Prize for Ph... | <urn:uuid:c551a345-cd9b-4d89-b1ee-ecf62c85c278> | 3.515625 | 177 | Knowledge Article | Science & Tech. | 35.57056 |
The sky is big. Searching it for potentially hazard objects like asteroids and comets is hard. The best way to do it? A big ‘scope, equipped with a BIG camera, and a wide, wide field of view. That’s just what the Panoramic Survey Telescope & Rapid Response System — PanSTARRS — brings to the table. It’s just a prototype... | <urn:uuid:06c18a2c-6a26-46d9-a413-009c2b53f292> | 3.4375 | 936 | Personal Blog | Science & Tech. | 72.25094 |
September 17, 2009
In the United States, the lowly ficus sits quietly in the corners of our homes and offices, providing some much needed greenery and oxygen to our indoor spaces. But in the northeastern Indian state of Meghalaya, where Ficus elastica are large, native outdoor trees that live near water, the local peop... | <urn:uuid:0888c6c2-97f2-4af3-b23a-5ce16939c7f0> | 3.78125 | 443 | Truncated | Science & Tech. | 45.165945 |
Even with global emissions of greenhouse gases drastically reduced in the coming years, the global annual average temperature is expected to be 2oC above pre-industrial levels by 2050. A 2oC warmer world will experience more intense rainfall and more frequent and more intense droughts, floods, heat waves, and other ext... | <urn:uuid:a3c3dba7-c61d-4630-bb49-506dc4837378> | 3.703125 | 297 | Knowledge Article | Science & Tech. | 24.994482 |
- Preyed upon by harpy eagles, anacondas, jaguars, ocelots and, of course, humans; excellent camouflage and slow movement help them elude predators
Preyed upon by harpy eagles, anacondas, jaguars, ocelots and of course humans. Excellent camouflage and slow movement help them elude predators
Several Species of pyramid m... | <urn:uuid:22b3ea95-0308-4911-b8cf-e4369d8debea> | 2.75 | 214 | Knowledge Article | Science & Tech. | 39.206676 |
Monday, March 14, 2011 - 13:00 in Physics & Chemistry
A partial meltdown has occurred at three nuclear reactors in the Fukushima power plant in Japan, due to a failure of the cooling system.
- Historian says history of nuclear power needs to be addressedTue, 5 Apr 2011, 13:03:49 EDT
- Self-powered sensors to monitor nu... | <urn:uuid:f3f94d80-5692-490d-b2f6-587fda621714> | 2.703125 | 162 | Content Listing | Science & Tech. | 34.192586 |
Photo: RunnerJenny (flickr)
Scientists have reason to believe birds have music on the brain when they’re sleeping. Researchers think that birds dream about their songs.
The key is a structure in birds’ brains that controls the nerves that make singing possible. Not only does this structure control the bird’s singing, b... | <urn:uuid:efaf2df8-c67d-430f-8ee0-92c5f9ab110e> | 3.5625 | 248 | Knowledge Article | Science & Tech. | 64.329252 |
What's happened to the Sun ? Sometimes it looks like the Sun is being viewed through a large lens. In the above case, however, there are actually millions of lenses: ice crystals. As water freezes in the upper atmosphere, small, flat, six-sided, ice crystals might be formed. As these crystals flutter to the ground, muc... | <urn:uuid:5fd59f38-ad7e-4875-8b33-772d638905a4> | 3.859375 | 247 | Knowledge Article | Science & Tech. | 56.002271 |
The MOC 10 trawl is lowered from the stern of the research ship. The collecting nets will remain closed until they reach the desired depth. Then they will be opened either electronically or mechanically by controls on the ship. Click image for larger view and image credit.
The Global Explorer, a remotely operated vehic... | <urn:uuid:bdc7150f-b404-4549-b663-661b171b8c66> | 3.53125 | 1,000 | Knowledge Article | Science & Tech. | 41.100842 |
I would try to get more systematic about my posts from now on. For every two non-technical posts I would keep two technical posts.
This post would also be the first in a series of posts that in which I intend to write about some Visual Illusions only.
Before getting into subject of this post, it would be helpful to hav... | <urn:uuid:f3b6854b-0ec7-4b8d-b0b3-1cfd1b3a7c20> | 3.3125 | 829 | Personal Blog | Science & Tech. | 63.01185 |
Explanation of Direct Current Electricity by Ron Kurtus - Succeed in Understanding Physics. Also refer to physical science, static electricity, AC, DC, magnetism, voltage, current, amps, resistance, ohms, generator, battery, lemon, voltmeter, water, hose flow, School for Champions. Copyright © Restrictions
Direct Curre... | <urn:uuid:9aee1a60-6894-4e79-a844-7d47fdb1a8f7> | 3.953125 | 1,479 | Tutorial | Science & Tech. | 40.889972 |
There are many different types of particles, all with different sizes and properties.
Three particles which are all around us are the proton, the neutron, and the electron. These are the particles which make atoms. The proton has a positive charge (a + charge). The neutron has a neutral charge. The electron has a negat... | <urn:uuid:176e9971-a2a7-44ba-831f-36718f380408> | 4.1875 | 205 | Knowledge Article | Science & Tech. | 61.316923 |
in waves is the fraction of a wave cycle which has elapsed relative to an arbitrary point.
The phase of an oscillation
Simple harmonic motion can serve as a mathematical model of a variety of motions, such as the oscillation of a spring. Additionally, other phenomena can be approximated by simple harmonic motion, inclu... | <urn:uuid:c2f7e32b-94a5-46a0-97ea-616ebde5cb99> | 3.84375 | 1,525 | Knowledge Article | Science & Tech. | 38.446732 |
Methylated genes are acquired at fertilization. As the zygote develops into a fully grown organism, its somatic cells will bear the same methylated genes. At the time that the organism produces its own gametes, the imprinted genes are un-methylated. Nonetheless, genomic imprints would be re-instituted in its genome. Th... | <urn:uuid:a8b712d6-cacc-4f7b-93a9-a1af7b9384ef> | 3.71875 | 186 | Content Listing | Science & Tech. | 42.882545 |
Title: SETI: Science Fact, Not Fiction
Speaker: Jill Tarter
Abstract: The privately funded Phoenix Project of the SETI Institute has been systematically searching the microwave portion of the radio spectrum for signals generated by another technology. This talk will discuss searches from both northern and southern hemi... | <urn:uuid:225d5f56-07c2-4df5-9b9d-66aceb3e399c> | 2.96875 | 142 | Academic Writing | Science & Tech. | 31.960923 |
A magnetic field has a magnitude of 1.2×10-3 T, and an electric
has a magnitude of 4.6×103 N/C. Both fields point in the same
tion. A positive 1.8-µC charge moves at a speed of 3.1 × 106 m/s in
direction that is perpendicular to both fields. Determine the
of the net force that acts on the charge. | <urn:uuid:ac0006ec-8988-4fba-a9b3-a22155718590> | 3.328125 | 89 | Q&A Forum | Science & Tech. | 102.324886 |
Shrinking land ice is wreaking havoc across the globe.
See how the global warming is shrinking Greenland's glaciers and raising sea level—and find other hot spots experiencing shrinking land ice on the Climate Hot Map.
- Sea-level rise. Water from shrinking glaciers and ice sheets is now the major contributor to global... | <urn:uuid:ea963f52-425b-42d3-a057-38fd8ab44b15> | 4.1875 | 360 | Knowledge Article | Science & Tech. | 52.429743 |
Bending moments are produced by transverse loads applied to beams. The simplest case is the cantilever beam , widely encountered in balconies, aircraft wings, diving boards etc. The bending moment acting on a section of the beam, due to an applied transverse force, is given by the product of the applied force and its d... | <urn:uuid:2e67c6df-dd63-4cdf-baf0-a9c948a0e28c> | 4.03125 | 562 | Tutorial | Science & Tech. | 48.956683 |
Improved observational techniques reveal features which challenge the very definition of elliptical galaxies. Many ellipticals contain disks or rings of stars, dust, or gas; others show signs of recent accretions in the form of shells of luminosity.
High-resolution surface photometry shows some elliptical galaxies have... | <urn:uuid:54783488-3877-4797-9db3-76a4eb4bb59c> | 2.734375 | 2,625 | Academic Writing | Science & Tech. | 39.232584 |
Earth & Space Science: Session 5
A Closer Look: Metamorphic Rocks
What are metamorphic rocks?
Metamorphic rock is rock that has physically and chemically changed, or "morphed," into new rock. The word "metamorphic" has its origins in classical Greek and means "to change form." Rock of any type (sedimentary, igneous, or... | <urn:uuid:d1dd5949-8a48-405c-adc2-8d110e1f9d0a> | 4.46875 | 690 | Knowledge Article | Science & Tech. | 35.570162 |
"Our vision for the marine environment is clean, healthy, safe, productive and biologically diverse oceans and seas. Within one generation, we want to have made a real difference."
UK Government, 2002
Oceans 2025 is NERC's co-ordinated marine science programme. Our seven marine research centres will work together to in... | <urn:uuid:5fc475fc-bed4-41f9-952f-8fe0142f3fdb> | 2.984375 | 197 | Content Listing | Science & Tech. | 43.103481 |
An alloy has been produced which not only has magnetic properties better than the best of current materials, but is also unrestricted by the patents that cover many widely used permanent magnets.
Michael Coey, a professor at Trinity College Dublin, says that the new material, an alloy of iron, samarium and nitrogen, is... | <urn:uuid:23c45bbe-7962-456a-86ea-010916d3da92> | 3.109375 | 214 | Truncated | Science & Tech. | 36.831356 |
EINSTEIN'S cosmic speed limit may not be absolute after all. When the overall energy level in space is negative, it should be possible to travel faster than light, a physicist claims.
The special theory of relativity, which holds that nothing can travel faster than light, has confounded hopes of interstellar travel. Bu... | <urn:uuid:005ccf30-70d5-40b9-ad91-3a8d5e5afc31> | 3.6875 | 218 | Truncated | Science & Tech. | 52.064938 |
“The genesis of life is as inevitable as the formation of atoms,” is how Andrei Finkelstein, the director of the Russian Academy of Sciences’s Applied Astronomy Institute, explained his ambitious timeline for finding alien life to an audience of astrobiologists and reporters in June. “There is life on other planets, an... | <urn:uuid:1d845da9-5fd7-451b-b568-958e486e38b4> | 2.921875 | 189 | Truncated | Science & Tech. | 25.068159 |
In regular heptagon ABCDEFG, show that 1/AB = 1/AC + 1/AE.
A regular heptagon is cyclic (as is as any regular polygon), and therefore any quadrilateral defined by four of its vertices is also cyclic.
Ptolemy's Theorem states that in a cyclic quadrilateral the sum of the products of the two pairs of opposite sides equal... | <urn:uuid:583fd601-ea7b-4062-ab7b-969274e5693b> | 2.921875 | 248 | Knowledge Article | Science & Tech. | 65.345625 |
The flier (Centrarchus macropterus) is a sunfish from the family Centrarchidae which is native to muddy-bottomed swamps, ponds, weedy lakes, and riverine backwaters across the American South, from southern Illinois east to the Potomac River basin and south to Texas.
The flier, which can live up to five years, grows to ... | <urn:uuid:e1093f36-e9a3-463e-873c-7ca266667ec7> | 3.03125 | 420 | Knowledge Article | Science & Tech. | 48.897932 |
View Full Version : Lunar Spacecraft - Solar Cells
2003-Feb-24, 07:23 AM
I have wondered about this since I saw the movie Apollo 13 and a thread in the LC forum reminded me of it. I have always thought that solar cells were used on some of the first satellites to provide power for their systems. Why couldn't they have ... | <urn:uuid:68a20854-587b-4b63-902c-7a493cd5069a> | 3.671875 | 879 | Comment Section | Science & Tech. | 81.691767 |
Paleozoic, Mesozoic, and Cenozoic. These are the major eras in the history of life on Earth, and the transition from one period to another has been marked by a major turnover in fossils — one assemblage of organisms going extinct and being replaced by another.
Today paleontologists agree that the biggest extinction in ... | <urn:uuid:39a26a1a-9433-4aaf-a9dd-f22c108f5a24> | 4.625 | 1,232 | Knowledge Article | Science & Tech. | 45.116975 |
Did you know that there are more than 12,000 species of ants all over the world! Here's some more fascinating facts about ants.
- An ant can lift 20 times its own body weight. If a second grader was as strong as an ant, she would be able to pick up a car!
- Some queen ants can live for many years and have millions of b... | <urn:uuid:253cc638-df8f-4802-bce4-9f8a12f891d2> | 3.5 | 231 | Listicle | Science & Tech. | 74.972269 |
A team of Filipino and American scientists have rediscovered a highly distinctive mammal -- a greater dwarf cloud rat -- that was last seen 112 years ago. Furthermore, it has never before been discovered in its natural habitat and was thought by some to be extinct.
- Dwarf cloud rat rediscovered after 112 yearsThu, 1 M... | <urn:uuid:b45c688b-c897-4c75-afa6-a079fa1e5d97> | 2.71875 | 167 | Content Listing | Science & Tech. | 23.850357 |
Evolution, as we learn in school, is so gradual that changes take place over hundreds or thousands of years. And of course, most of us never get a concrete look at what the process of evolution looks like. But a certain type of Australian lizard is teaching the whole world a lesson about evolution by changing right bef... | <urn:uuid:b53484d9-7c0b-4951-a540-5656f46cc22b> | 3.8125 | 315 | Personal Blog | Science & Tech. | 49.346578 |
Advantages of the Domain Model
Confining object/relational mapping logic to a clearly demarcated data access layer (DAL) within your application, facilitates the creation of a single, coherent, object-oriented Domain Model to represent your application’s business objects. Adherence to this practice leads to more robust... | <urn:uuid:bed909b7-47fa-49f9-bd8c-a83411e05dbf> | 2.921875 | 590 | Personal Blog | Software Dev. | 36.822334 |
Earth’s first animal was the ocean-drifting comb jelly, not the simple sponge, according to a new find that has shocked scientists who didn’t imagine the earliest critter could be so complex.
What’s wrong with this? Basically, the study showed that the line leading to the ctenophores may have diverged before the other ... | <urn:uuid:dd712dc2-78e4-4806-9983-a7fc9321735f> | 3.859375 | 587 | Personal Blog | Science & Tech. | 38.115909 |
"It's not as if I have the kids go in and do a science experiment, and then go in the next day and do another experiment, and so on.." my son's 6th grade science teacher told me.
Rather, he assured, today's science classes focus on more important things, like communicating scientific ideas through presentations and pos... | <urn:uuid:52bb4d0c-8827-40f3-ae07-d9cf140774e5> | 3.546875 | 618 | Personal Blog | Science & Tech. | 68.173758 |
Here is one of NASA’s latest videos of the surface of the sun — but it’s not just any video showing coronal mass ejections. This video was shot using a specific “extreme ultraviolet light” to best showcase the plasma in the sun’s atmosphere, also known as the corona.
The corona reaches 600,000 Kelvin. In case you have ... | <urn:uuid:b06fb6b2-dfcb-44a6-b005-3e79f71325b7> | 3.828125 | 442 | Personal Blog | Science & Tech. | 59.303231 |
Research - Pelagic Plastic
Plastic in the ocean may be one of the most alarming of today's environmental stories. Plastic, like diamonds, are forever! Because plastics do NOT biodegrade, no naturally occurring organisms can break these polymers down. Instead, plastic goes through a process called photodegredation, wher... | <urn:uuid:29960791-e1cf-4bda-88b3-8a515940b965> | 3.890625 | 405 | Knowledge Article | Science & Tech. | 42.145655 |
Uric acidUric acid is an organic compound of carbon, nitrogen, oxygen and hydrogen, with the formula C5H4N4O3
The structure of the ureate anion (the anion of uric acid) is:
It is a minor end-product of nitrogen metabolism in the human body (the main product being urea), and is found in small amounts in urine. In some o... | <urn:uuid:0056f65c-5416-4765-b249-57209fe8b9a8> | 3.265625 | 206 | Knowledge Article | Science & Tech. | 34.005006 |
The animal itself was segmented and soft shelled. The head carried an array of five apparently functional eyes and a long flexible snout that appears to be in no way homologous to the appendages on the head of any other lifeform of the time. The body segments each featured a set of gills and a pair of flap like appenda... | <urn:uuid:1ccc2bda-e71c-4250-b303-b68995973163> | 3.8125 | 298 | Knowledge Article | Science & Tech. | 34.120105 |
Once river walleyes spawn, they typically disperse from spawning sites to current break locations to rest and recuperate. If the flow is high, they often seek refuge in flooded wood and slough backwaters, where they may remain until water levels subside.
‘EYE GOTTA SPAWN
In spring, river walleyes seek out classic spawn... | <urn:uuid:2ca01423-f712-4300-87cb-2e9029288f41> | 2.859375 | 604 | Personal Blog | Science & Tech. | 49.958544 |
The slide show below shows a geodesic dome. Details of how to construct this dome can be found in the book Spherical Models by Magnus Wenninger.
It is basically a (spherical) icosahedron with each face split into 16 triangles (a mixture of scalene, isosceles and equilateral) resulting in 320 triangles. There are 12 pen... | <urn:uuid:a501375c-11c3-4785-b824-8bc557b001a0> | 3.796875 | 284 | Tutorial | Science & Tech. | 72.028106 |
Since the beginning of August, NASA's Mars Curiosity rover has been exploring the Red Planet and learning as much as it can about the terrain.
NASA's Mars Curiosity rover has found evidence of an old streambed on the Red Planet.
NASA's Lunar Reconnaissance Orbiter (LRO) has acquired stereo images of the moon in high re... | <urn:uuid:1394485b-47ac-4c9f-9b07-16ac4aeb21a8> | 3.265625 | 621 | Content Listing | Science & Tech. | 39.343436 |
Did you know that sugar contains some of the essential ingredients for life? That doesn’t mean that eating lots of sweets is healthy. However, sugar is made up of a simple recipe of chemicals called carbon, hydrogen and oxygen. And almost all life on Earth is made up of these three chemicals, plus another one, which is... | <urn:uuid:dc7a9601-121b-48ca-913d-5a9ac9d8870a> | 2.8125 | 106 | Knowledge Article | Science & Tech. | 58.269 |
What is the importance of chemical bonds in molecules? ...
Chemical bonds are what keep the atoms in a molecule together, without them you won't exist, the tables and chairs and anything visible would no ...
What is the importance of chemical bonds in molecules?
Chemical bonds are what keep the atoms in a molecule toge... | <urn:uuid:027d7ef1-38a3-4436-8c37-e73802b197f6> | 2.984375 | 510 | Q&A Forum | Science & Tech. | 43.151953 |
||This article is missing information about the mechanism of parasitic action. Please expand the primary text and the lead to include this information. (October 2011)|
A parasitic plant is one that derives some or all of its sustenance from another plant. About 4,100 species in approximately 19 families of flowering pl... | <urn:uuid:09ff90ae-1259-465b-9878-7ce3d0f189d1> | 3.78125 | 2,327 | Knowledge Article | Science & Tech. | 40.626023 |
SOIL REFLECTANCE DATA (FIFE)Entry ID: FIFE_SOILREFL
Abstract: Soil reflectance properties are an important factor in determining landscape reflectance characteristics. No soil reflectance data were collected as part of the FIFE experiment. Therefore, the FIS staff choose spectra from soils similar to those in the FIFE ... | <urn:uuid:b46b60ca-0e78-4f04-b264-fe573a9b2b7c> | 2.796875 | 476 | Structured Data | Science & Tech. | 39.469971 |
Climate science is solid because it is based on the laws of physics, we hear sometimes, but perhaps this sentence conveys subliminally a level of uncertainty that is debatable. Even if the laws of physics are perfectly known, calculations based on these laws may be just approximate. This is the case for climate models.... | <urn:uuid:85f32628-8957-4321-9b32-15fd1f1a157e> | 3.421875 | 908 | Personal Blog | Science & Tech. | 36.560803 |
WHO IS considered to be the father of algebra?
While the word algebra comes from the Arabic language ( al-jabr "restoration") and much of its methods from Arabic/Islamic mathematics, its roots can be traced to earlier traditions, which had a direct influence on Muhammad ibn Ms al-Khwrizm (c. 780850). He later wrote The... | <urn:uuid:8bd5eb62-cb8b-42b0-b7bf-6c4cf0f07747> | 3.375 | 274 | Q&A Forum | Science & Tech. | 38.086897 |
Mission Type: Orbiter
Launch Vehicle: Atlas-Able (no. 3 / Atlas D no. 91)
Launch Site: Cape Canaveral, United States, launch complex 12
Spacecraft Mass: 176 kg
Spacecraft Instruments: 1) micrometeoroid detector; 2) high-energy radiation counter; 3) ionization chamber; 4) Geiger-Mueller tube; 5) low-energy radiation cou... | <urn:uuid:cbeaff14-1520-4378-8b00-67d87e3c63f6> | 3.25 | 336 | Knowledge Article | Science & Tech. | 47.067526 |
The ice birds of
SUMMIT COUNTY — You had to know it was coming sometime. I’m actually surprised I was able to resist posting a penguin photoblog for as long as I have. They’re so cute and photogenic, as well as incredibly tame, so you don’t even have to have any special wildlife photography skills to photograph them. B... | <urn:uuid:20163e11-8168-403e-b791-becbcab925b4> | 3 | 564 | Personal Blog | Science & Tech. | 46.241069 |
Shepherd's beaked whale, Tasman whale
Unlike most beaked whales, Shepherd's beaked whales feed on fish, and not squid.
Body length: 6-7m, Weight: 2-3 tonnes.
Shepherd's beaked whales have a dark brown/black upper surface, fins, flippers and flukes, and a creamy underside. They have a light patch on the top of the head,... | <urn:uuid:dbe87289-4821-4578-9a32-eb203a08b00e> | 3.390625 | 193 | Knowledge Article | Science & Tech. | 72.058435 |
Not every crazy idea, say dropping out of Harvard to start a software firm, is a bad one. But you don't have to be Bill Gates to place your bets that way.
Consider atmospheric geoengineering -- pumping reflective particles into the stratosphere to reflect sunlight -- seen as a way to cut the effects of global warming. ... | <urn:uuid:87a64e36-e3ed-4b55-b838-7552cfb3af38> | 3.125 | 197 | Nonfiction Writing | Science & Tech. | 44.178805 |
Test or set particular bits in a string
Treats the string in EXPR as a vector of unsigned integers, and returns the value of the
bit field specified by OFFSET. BITS specifies the number of bits that
are reserved for each entry in the bit vector. This must be a power of two from 1 to 32. vec()
may also be assigned to, i... | <urn:uuid:7c92239f-c831-4c8c-a8be-6282ece0da1a> | 3.46875 | 510 | Documentation | Software Dev. | 67.419173 |
make-package package-name &key nicknames use => package
Arguments and Values:
package-name---a string designator.
nicknames---a list of string designators. The default is the empty list.
use---a list of package designators. The default is implementation-defined.
Creates a new package with the name package-name.
Nicknam... | <urn:uuid:697daeb3-deeb-4393-9a14-6ee5e842b25b> | 3.03125 | 379 | Documentation | Software Dev. | 26.414222 |
At the NESL prompt you can type a NESL top-level expression, as defined by the language, or a top-level command, which is used to control or examine various aspects of the environment. The top-level commands are summarized in Figure 1 and most are described in Section 3.
Figure 1: Top-level commands (screendump obtaine... | <urn:uuid:355310f9-36b1-4bb0-b3de-373b9ada4861> | 3.5 | 340 | Documentation | Software Dev. | 58.109497 |
down into the lava lake of Erebus.
the heart of the volcano.
senses on Erebus:
by Noel Wanner and Paul Doherty
an infant explore a strange object: they'll look at it intently,
touch it, shake it, put it in their mouths-- almost anything
that will help them determine what this new thing might be.
Scientists, in their qu... | <urn:uuid:10f08d52-a9dd-4721-a10e-1ae5d9365d33> | 3.4375 | 1,030 | Nonfiction Writing | Science & Tech. | 43.984674 |
Carl Friedrich Gauss
His formal name is Johann Carl Friedrich Gauss, although "Johann" is normally left out. However, to the mathematicians of the world, he is simply Gauss.
|Date of Birth: 4/30/1777
||Date of Death: 2/23/1855
Birthplace: Braunschweig, Holy Roman Empire
Gauss contributed so much to mathematics that he ... | <urn:uuid:1734b734-d0e5-4d99-89ba-2dc659b9c813> | 3.203125 | 369 | Knowledge Article | Science & Tech. | 72.211667 |
Editor's Note: This is the latest episode of Energy NOW!, A video program dedicated to energy and environmental issues. You can see the full video at the bottom of this post, and archived episodes are online at EnergyNow.com.
First up this week, is it possible to burn coal without putting carbon dioxide into the atmosp... | <urn:uuid:6c212327-944a-4a8d-ab82-3582d3e1aa61> | 3.390625 | 534 | Content Listing | Science & Tech. | 51.889007 |
FOR a few years now, astronomers have been quietly confident that the universe is 13.7 billion years old, give or take a hundred million years. They are about to learn that the size and age of the universe are not a done deal.
Norbert Przybilla of the University of Erlangen-Nuremberg, Germany, and his colleagues used t... | <urn:uuid:e8149132-1569-40a7-a0f4-9cc214d753c9> | 3.890625 | 241 | Truncated | Science & Tech. | 51.821011 |
- In the News
- Companion of Honour
- Letters of Congratulation
- Higgs Boson Discovery
- Higgs Centre for Theoretical Physics
- Searching for the Higgs Boson
- Higgs Research at Edinburgh
- Brief History of the Higgs Mechanism
- Peter Higgs: Curriculum Vitae
- My Life As A Boson
- Nonino Prize Man of Our Time 2013
- E... | <urn:uuid:9ed11af7-0057-44e1-9d49-b28679f7f593> | 3.078125 | 367 | Content Listing | Science & Tech. | 40.155081 |
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.
April 11, 1997
Explanation: The Earth has once again endured a burst of particles from the Sun. The latest storm, which began Monday, was one of the... | <urn:uuid:d9fed548-d72e-4b7a-8c0e-193853566944> | 3.234375 | 260 | Knowledge Article | Science & Tech. | 47.164796 |
|Sep16-12, 03:15 PM||#1|
How exactly does a current create a magnetic field and vice versa?
And why is it parallel? Do we actually know what causes magnetism at all?
|Sep16-12, 03:56 PM||#2|
|Sep16-12, 04:21 PM||#3|
Relativity is an explanation of what happens, and is as good a one as we have.
But you can always ask 'w... | <urn:uuid:875e1d53-c267-4e81-bcc3-2ca753a89bb6> | 3.125 | 313 | Comment Section | Science & Tech. | 79.474142 |
If you look up at the night sky in most cities, you will see a murky haze, and few stars. This occurrence is no longer unique to cities; in fact, 2/3 of the world’s population can no longer see the Milky Way. As night skies become emptier, astronomers worry about observatories becoming obsolete, and others simply fear ... | <urn:uuid:7b667af5-3cfb-4f1b-9fdf-84efab896856> | 3.375 | 509 | Personal Blog | Science & Tech. | 32.904403 |
Let be a closed contour parameterized by in the range , and a function meromorphic inside and on . Define for some . The argument principle relates the change in argument of as describes once in the positive direction to the number of zeros and poles inside the contour. The change in argument for one complete circuit a... | <urn:uuid:570a3722-72b4-4d80-808b-3e0c28626349> | 3.546875 | 276 | Documentation | Science & Tech. | 56.101121 |
Concept 20 A half DNA ladder is a template for copying the whole.
Matthew Meselson and Franklin Stahl invented the technique of density gradient centrifugation and used this to prove that DNA is replicated semi-conservatively. Arthur Kornberg identified and isolated DNA polymerase I — one of the enzymes that can replic... | <urn:uuid:6cc608fc-2060-4b58-8104-8c19957f5040> | 3.53125 | 798 | Knowledge Article | Science & Tech. | 38.401487 |
Hosted by The Math Forum
Problem of the Week 1152
A Better Cable Connection
A uniform cable attached to a ceiling at one end and holding up a weight at the other end will always break at the top, because the top has to support the weight plus the cable below it. This is wasteful because the bottom part of the cable nee... | <urn:uuid:2ca65b95-5cf6-42a2-9738-1d87438db5e6> | 3.140625 | 328 | Tutorial | Science & Tech. | 67.814747 |
Recent developments in this field have been concerned with (1) new major catalogues of standard Hubble types; (2) slight modifications to existing classification systems; (3) the identification of new types of galaxies and improved understanding of older types; (4) identification of the major orbit resonances in grand ... | <urn:uuid:6117b2e1-4fe1-4139-9a0b-0dcc62913c60> | 2.875 | 3,197 | Academic Writing | Science & Tech. | 36.783237 |
Located 1,000 light-years from Earth in the constellation Perseus, a reflection nebula called NGC 1333 epitomizes the beautiful chaos of a dense group of stars being born. Most of the visible light from the young stars in this region is obscured by the dense, dusty cloud in which they formed. With NASA's Spitzer Space ... | <urn:uuid:b8fea281-a8ff-4f9c-8a4f-4ee0aed0bd40> | 4.34375 | 357 | Personal Blog | Science & Tech. | 56.731472 |
There's a rather impressive diversity of animals associated with this bamboo coral (Keratoisis sp.), discovered at 1,455 m depth at Davidson Seamount.
Deep-sea Corals and How to Measure Their Age and Growth
Allen H. Andrews
Moss Landing Marine Laboratories
Andrew DeVogelaere, PhD
Davidson Seamount: Exploring Ancient Co... | <urn:uuid:9d3a5aaa-3dee-4283-970b-590b0ef4a367> | 3.828125 | 1,396 | Knowledge Article | Science & Tech. | 56.464018 |
Yes. As John says, the high specific heat capacity of cheese causes it to absorb more heat to raise its temperature than the crust does. If you do an experiment by heating a sample of it in an oven (say to about 300 degrees), you could observe that the crust reaches the temperature more quickly than the cheese. So, che... | <urn:uuid:b804516c-b58d-40e4-aacc-16935df8e0ec> | 2.734375 | 217 | Q&A Forum | Science & Tech. | 66.189835 |
This last weekend marked the 10th anniversary of the Biology Leadership Conference. One hundred and two biology educators gathered from all over the U.S., Canada (plus one attendee from Bangladesh!) for the three-day meeting in Tucson, Arizona. The conference keynote address was given by Hopi Hoekstra, Professor of Zoo... | <urn:uuid:77c40315-1ab4-45da-9187-b68c895397a8> | 2.953125 | 2,126 | Personal Blog | Science & Tech. | 41.880932 |
If the red roof image represents the panels, you are not tracking, & therefore are significantly limiting your collected power.
To obtain a chart of the solar path in your area, see the University of Oregon website:http://solardat.uoregon.edu/SunChartProgram.html
It is of course not just the path of the sun, but what m... | <urn:uuid:222fd21d-f200-426f-ae6f-ab891e48e894> | 2.875 | 530 | Comment Section | Science & Tech. | 52.494053 |
Okay, we’re going to need some other algebraic tools before we go any further into linear algebra. Specifically, we’ll need to know a few things about the algebra of polynomials. Specifically (and diverging from the polynomials discussed earlier) we’re talking about polynomials in one variable, and with coefficients in... | <urn:uuid:ff1027c0-05ce-4ad1-91a6-48a2817e8c25> | 3.546875 | 523 | Personal Blog | Science & Tech. | 54.22068 |
COULD YOU PLEASE TELL ME WHAT YOU CALL A GROUP OF WHALES.
Whales travel together in relatively small groups called 'pods'.
Scientists have spent much time studying the dynamics of these
pods, which tend to be very fluid (which means that individual
whales join and leave the pods, thus changing its structure and
dynamic... | <urn:uuid:0b80f3a0-a761-41e9-8a07-928815b370a1> | 2.796875 | 170 | Q&A Forum | Science & Tech. | 57.861452 |
Diagram of the H3+ molecule (top circle) and its breakup into three distinct particles (bottom circle)--H+, H-, and H+. The H3+ molecule contains three protons (indicated by "+" signs in the diagram). When the three protons of H3+ are less than 10 atomic units apart (where 1 a.u. is equal to the size of the hydrogen at... | <urn:uuid:49c44eb0-cfdc-47b1-9580-0ef2bdac27d9> | 4 | 490 | Academic Writing | Science & Tech. | 65.641155 |
Simply begin typing or use the editing tools above to add to this article.
Once you are finished and click submit, your modifications will be sent to our editors for review.
characteristics of heliozoans
Actinophrys sol is a common species often referred to as the sun animalcule. Acanthocystis turfacea is a similar spe... | <urn:uuid:64d42dad-f253-432f-b908-834fc46dff3e> | 2.953125 | 145 | Knowledge Article | Science & Tech. | 37.841045 |
Los Alamos Seismic Network
The Los Alamos Seismic Network (LASN) The Los Alamos Seismograph Network is located in North-Central New Mexico, about 100 km north of Albuquerque. This network has been operated by Los Alamos National Laboratory since September, 1973. For the first 10-15 years (to 1985), stations were locate... | <urn:uuid:1d2ca2ab-92a7-411e-898f-debc93e49b4f> | 2.703125 | 284 | Knowledge Article | Science & Tech. | 38.681275 |
Jo Marchant, consultant
In the 1970s, Karl Popper came up with a philosophical theory of reality
that involved three interacting worlds: the physical world, the mental world, and "world 3", which comprises all products of the human mind - from ideas, pictures and music to every word ever written.
Something very similar... | <urn:uuid:bc8ef435-8402-42a3-af4a-d9c696c98d96> | 3.265625 | 1,373 | Nonfiction Writing | Science & Tech. | 44.335925 |
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The Water World Must Have Life
Tue Apr 21 23:56:55 BST 2009 by A. H. Engineer
You must have misread this article. Gilese 581 is a Red Dwarf star, spectral type M3V. This means it is a main sequence Fusion powered star, of a red shift type.
This star, approximately .3 times the mass of ou... | <urn:uuid:84dc93a2-543e-48a5-81a9-b83241fdec9d> | 2.890625 | 311 | Comment Section | Science & Tech. | 66.747794 |
This has been common knowledge for as long as the theory of evolution has been around, but only recently have scientists been able to identify a link between whales and their land ancestry. That all changed in 2007 when researchers discovered the 48-million-year-old skeleton of a creature called Indohyus.
The bones of ... | <urn:uuid:be00aedb-b528-4242-93f9-43c8a4589e80> | 3.90625 | 285 | Personal Blog | Science & Tech. | 31.129615 |
Mercier, A.; Sun, Z.; Baillon, S.; Hamel, J.-F. (2011). Lunar Rhythms in the Deep Sea: Evidence from the Reproductive Periodicity of Several Marine Invertebrates. Journal of Biological Rhythms. 26 (1) 82-86.
While lunar rhythms are commonly documented in plants and animals living in terrestrial and shallow-water enviro... | <urn:uuid:9c9b92d5-3a2b-4aee-9709-a53372d24c5e> | 3.171875 | 211 | Academic Writing | Science & Tech. | 36.912 |
Web Dev Reference
Get flash to fully experience Pearltrees
3-tier application a program that is organized into three major parts: the workstation or presentation interface; the business logic; and the database and related programming. Each of these is distributed to one or more separate places on a network. agile softw... | <urn:uuid:c2314acc-c7b0-4a92-a6a0-4d2ae927f203> | 2.78125 | 164 | Documentation | Software Dev. | 31.475952 |
Measurement - Key terms
The process of checking and correcting the performance of a measuring instrument or device against a commonly accepted standard.
A method used by scientists for writing extremely large or small numbers by representing them as a number between 1 and 10 multiplied by a power of 10. Instead of writ... | <urn:uuid:5f9338c1-e733-49b8-ae2e-b9fd32b3a6e2> | 3.34375 | 139 | Structured Data | Science & Tech. | 49.465389 |
With the state our planet is in today, more and more people are attempting to learn all about green energy, what it is, and what it does for your home, your wallet, and for the environment. If you have questions about green energy, keep reading this article and you may just find an answer.
In simple terms, green energy... | <urn:uuid:1752e2af-1044-4b64-9ff0-9780779415a9> | 3.109375 | 651 | Personal Blog | Science & Tech. | 50.08591 |
...there was little evidence to back it up [the phenomenon of rogue waves]. But in 1995, an oil rig in the North Sea recorded an 84-ft.-high (25.6 m) wave that appeared out of nowhere, and in 2000, a British oceanographic vessel recorded a 95-ft.-high (29 m) wave off the coast of Scotland.
Friday, April 20, 2012
Rogue ... | <urn:uuid:5025f22a-5409-4ea7-818f-8b02fe4f0367> | 2.921875 | 157 | Truncated | Science & Tech. | 77.126079 |
Last week I wrote about timing how long it took valves at the Hatch plant to open and close. Here’s another case.
On April 12, 2012, workers tested how long it took the three main steam isolation valves at the Shearon Harris nuclear plant near Raleigh, North Carolina to travel from the fully opened to the fully closed ... | <urn:uuid:dfa0f2f1-46ab-4763-bbe4-1d63bb3a7aae> | 3.171875 | 1,367 | Nonfiction Writing | Science & Tech. | 44.49581 |
Halobacterium salinarum needs very little to survive, but a Growth Medium is vital because it will be acting as a salty environment and provide nutrients for growth. A warm place around 37 degrees Celsius is ideal but not required; the heat simulates a warm climate which causes H. salinarium to grow at a faster rate. A... | <urn:uuid:7ea1ad82-ffa0-4bda-a31d-22c79b2aa0eb> | 3.546875 | 544 | Knowledge Article | Science & Tech. | 31.979077 |
Solar Panels are a widely regarded as one of the greatest innovations however there are still lots of myths and misconceptions. These include the use of solar panels during the winter and the efficiency of the panels themselves.
Solar panel efficiency is too low
As with any new technology it continuously develops to im... | <urn:uuid:3c47e98b-f843-4871-b22d-f2d887102f41> | 2.96875 | 359 | Listicle | Science & Tech. | 39.137902 |
Last modified on 28 May 2013, at 14:54
Plate tectonics is the theory (nothing in science can be absolutely proven) that the Earth is constantly moving, usually only a few inches per century. If it moves more than this, there is an earthquake. Plate tectonics mainly deals with the crust of the earth, not the mantle or c... | <urn:uuid:6e99944b-0a4e-47e7-82cc-0a40c3d8bdae> | 3.90625 | 225 | Knowledge Article | Science & Tech. | 51.316554 |
Processes, sediments, and stratigraphy of the Fly River Delta
Walsh, John P., and Ridd, Peter V. (2009) Processes, sediments, and stratigraphy of the Fly River Delta. In: The Fly River, Papua New Guinea: environmental studies in an impacted tropical river system. Developments in Earth & Environmental Sciences 9 . Elsev... | <urn:uuid:7329373d-ad7c-4efa-a9bb-c3edb2ddfc0b> | 2.921875 | 420 | Academic Writing | Science & Tech. | 49.164479 |
Though the aliens in 2010 told humanity to stay away from Jupiter's moon Europa, that hasn't stopped aerospace engineer Joseph Shoer from designing a probe that could look beneath the moon's icy surface and peek into the oceans below.
Shoer proposes a way to search beneath the kilometers-thick ice of Europa by sending ... | <urn:uuid:094ad698-1142-4840-9141-f2bd84ac92db> | 2.9375 | 636 | Personal Blog | Science & Tech. | 49.84902 |
Science Fair Project Encyclopedia
Ohm's law, named after its discoverer Georg Ohm , states that the potential difference (or voltage drop V) between the ends of a conductor (for example, a resistor R) and the current, (I) flowing through R are proportional at a given temperature:
where V is the voltage and I is the cur... | <urn:uuid:23884f76-6a75-4f20-ae60-d5796a077ee7> | 4.46875 | 926 | Knowledge Article | Science & Tech. | 28.983238 |
Gas Ring Around Young Star Raises Questions
The ring is part of the star’s planet-forming disk, and it’s as far from V1052 Cen as Earth is from the Sun. Discovered with the European Southern Observatory’s Very Large Telescope, its edges are uniquely crisp.
Carbon monoxide is often detected near young stars, but the gas... | <urn:uuid:3ddb961b-ab37-4f49-8d31-7d3181935fbf> | 3.65625 | 410 | Truncated | Science & Tech. | 52.889504 |
A mountain is a landform that extends above the surrounding terrain in a limited area. A mountain is generally much higher and steeper than a hill, but there is considerable overlap, and usage often depends on local custom. Some authorities define a mountain as a peak with a topographic prominence over an arbitrary val... | <urn:uuid:396ced8d-4ec3-4c5c-8896-62b05fbb1119> | 4.15625 | 814 | Knowledge Article | Science & Tech. | 40.302463 |
Springtime promises green fields and woodlands as well as the bright colors and scents of flowers. But try awakening another sense this May. Each year millions of migrant songbirds return to the Northeast, and the way we first notice them is a change in the soundscape.
For example, on spring evenings, the male American... | <urn:uuid:0a4e106b-1050-49f5-9238-8ef1b5286fa3> | 3.421875 | 335 | Knowledge Article | Science & Tech. | 56.131581 |
HydroClim Minnesota - October 2009
A monthly electronic newsletter summarizing Minnesota's climate conditions and the resulting impact on water resources. Distributed on the Wednesday following the first Monday of each month.
State Climatology Office - DNR Waters
What happened in September:
- September 2009 rainfall wa... | <urn:uuid:26363059-ae10-419a-9066-729ffe4db540> | 2.75 | 1,768 | Knowledge Article | Science & Tech. | 35.022643 |
Pacific Rocky Intertidal Monitoring: Trends and Synthesis
Click here for Biodiversity Survey findings
Partington Cove is located in the Central Coast region of California, within the Monterey Bay National Marine Sanctuary. This site is located within Julia Pfeiffer State Park. This site is also located in an Area of Sp... | <urn:uuid:cce055de-1432-4725-a0de-0897d304e7b2> | 3.078125 | 243 | Knowledge Article | Science & Tech. | 22.9175 |
Remember to use the Fill Down command after changing the output rules. The graphs and tables will change automatically with any changes you make to the columns.
Groups: After completing Problems A1-A7, discuss your responses to Problem A7.
The tendency may be to answer Problem A7 with particular numbers. For example, t... | <urn:uuid:6dca73b8-f193-4d46-aa1b-48fe5eb5f442> | 4.625 | 565 | Tutorial | Science & Tech. | 73.717506 |