text large_stringlengths 148 17k | id large_stringlengths 47 47 | score float64 2.69 5.31 | tokens int64 36 7.79k | format large_stringclasses 13
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December 27, 2011
In Greek mythology, Echidna was half snake and half woman, and she was the mother of all monsters. The animal echidna, with its stocky body covered in defensive spines, doesn’t look much like a monster, but as a type of mammal called a monotreme, it does share features with both snakes and humans. Lik... | <urn:uuid:89448307-98fc-4588-a33c-85d87354cd93> | 2.96875 | 682 | Personal Blog | Science & Tech. | 60.091758 |
Scientific name: Vanessa atalanta
Brown/black wings with red bands and white spots near the tips of forewings. Undersides dark and mottled.
A large and strong-flying butterfly and common in gardens. This familiar and distinctive insect may be found anywhere in Britain and Ireland and in all habitat types.
Starting each... | <urn:uuid:a51e7c53-fc58-4923-9b7b-9dfe0f56160f> | 3.578125 | 398 | Knowledge Article | Science & Tech. | 33.250455 |
Cross Posted from ScienceDaily (July 6, 2011)
Decreasing autumn and winter rainfall over southern Australia has been attributed to a 50-year decrease in the average intensity of storms in the region — a trend which is forecast to continue for another 50 years.
“The drop in winter and autumn rainfall observed across sou... | <urn:uuid:80d8fc85-14b7-43e8-99ad-c68946316216> | 3.125 | 674 | Truncated | Science & Tech. | 27.06065 |
View Full Version : What are Messier's?
2003-Dec-20, 05:43 PM
I am very new to astronomy, my question is, what is the exact definition of a Messier Object and a Nebula? are they the same thing?
Thanks in Advance.
2003-Dec-20, 06:24 PM
Messier onject is an Deep Sky object, including Nebula, star cluster, and galaxies, s... | <urn:uuid:49f51249-3e1f-4cf7-a28c-eba2538f5697> | 3.03125 | 367 | Comment Section | Science & Tech. | 68.012993 |
Functions to determine the current geolocation of the device.
This file defines the geolocation service, which provides functions for reading the device's geolocation. To read the geolocation data, the application must have the read_geolocation capability. To grant an application the read_geolocation capability, the ba... | <urn:uuid:531fe44c-447a-40a9-ac34-6dc6e66ca7ff> | 2.796875 | 328 | Documentation | Software Dev. | 20.450345 |
GAMMA RAY ERUPTION IN THE CRAB NEBULA May 11, 2011Posted by jcconwell in Astronomy, Neutron Stars.
Tags: Crab Nebula, Gamma Ray Eruption, neutron star
add a comment
WASHINGTON (NASA) — The famous Crab Nebula supernova remnant has erupted in an enormous flare five times more powerful than any flare previously seen from ... | <urn:uuid:ca364eac-31ed-4cbb-82ac-e02db461420a> | 3.671875 | 2,145 | Content Listing | Science & Tech. | 48.473338 |
[Editor's note: Spoiler alert: "El Niño Modoki (Japanese for “similar but different”) triggers more landfalling storms in the Gulf of Mexico and the western Caribbean than normal, and more tropical storms and hurricanes in the Atlantic than El Niño does. Another difference: Modoki’s precipitation patterns are the rever... | <urn:uuid:abca3756-752d-4f7d-896b-ef94913648e7> | 3.46875 | 208 | Truncated | Science & Tech. | 28.030385 |
See also the
Dr. Math FAQ:
3D and higher
Browse Middle School Two-Dimensional Geometry
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Pythagorean theorem proofs.
- Area and Perimeter [05/01/2001]
I do not understand area and perimeter - can you ex... | <urn:uuid:cc1c630c-1660-4844-8c1b-31e9d071bf2d> | 3.828125 | 1,462 | Q&A Forum | Science & Tech. | 70.43816 |
Solve the simultaneous congruences
2x = 1 (mod7)
those aren't supposed to be equal signs- they are three slashes(congruences).
I would do the first one, but I'm out of time, gotta get ready for work, and wouldn't want to steer you wrong.
For the second one, you can see that 3=5*0+3, so when x = 3, it is congruent to 3(... | <urn:uuid:8ff6a24e-a9c2-4d59-a4f2-06e47850f906> | 2.9375 | 396 | Tutorial | Science & Tech. | 98.514483 |
Pi - or π - is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space, it is the same value as the ratio of a circle's area to the square of its radius. It is approximately equal to 3.14159 in the usual decimal notation. Pi is one of the most important mathemat... | <urn:uuid:0597be1b-433d-40a4-a667-8948cec0cece> | 2.828125 | 198 | Personal Blog | Science & Tech. | 53.45311 |
Sinkholes by Caitlyn, Meredith and Margi
Southeast Minnesota is the sinkhole capital of the U.S.A. These strange holes in the ground are all over the place. Some have been here for as long as we can remember and some seem to pop up overnight. But we wanted to know, how do these sinkholes form?
What did we do?
We looked... | <urn:uuid:146fd798-4ed2-4505-8c9a-64f493df8b63> | 3.953125 | 620 | Knowledge Article | Science & Tech. | 66.692778 |
Basic Rules are simple attributes of a design. The rule must return a value of a specific data type, which is included in the declaration of the rule. The long form of a rule specification begins with the Rule keyword and terminates with End Rule.
Rule numberOfBearings As Integer Return 2 End Rule
Rule totalSprocketWid... | <urn:uuid:22ce93af-1a60-4694-acab-8953c868a24c> | 3.265625 | 312 | Documentation | Software Dev. | 33.000526 |
Intense warm climate intervals--warmer than scientists thought possible--have occurred in the Arctic over the past 2.8 million years.
That result comes from the first analyses of the longest sediment cores ever retrieved on land. They were obtained from beneath remote, ice-covered Lake El'gygytgyn (pronounced El'gee-gi... | <urn:uuid:4e2ec14c-4ff1-48c3-986e-0108ccc7dd98> | 4.21875 | 404 | Knowledge Article | Science & Tech. | 32.999511 |
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.
extraction and processing
...the austenite crystals transform into a fine lamellar structure consisting of alternating platelets of ferrite and ir... | <urn:uuid:68b02a5d-e90e-4ac5-9c01-77f5eb9dae08> | 3.3125 | 151 | Knowledge Article | Science & Tech. | 45.690584 |
The marine food chain
Marine biologists know that the marine food chain is particularly complex and sensitive to the distribution and duration of the ice cap. Accordingly, Danish research scientist Professor Torkel Gissel Nielsen of The National Environmental Research Institute, NERI, working with other researchers, ha... | <urn:uuid:3499532b-fa6d-4fa3-8166-bf3845ca4053> | 3.703125 | 399 | Knowledge Article | Science & Tech. | 48.764167 |
What does it mean when you say that two variables are
In general mathematics, two variables are considered "related" if
changing the value of one changes the value of the other. This is a very
general concept, so do not make it over-complicated. For example, Y= X+2.
The variables X and Y are related by the equation: Y=... | <urn:uuid:6137efaa-d648-44e1-af20-202331ad5578> | 3.375 | 368 | Knowledge Article | Science & Tech. | 50.20276 |
|Feb22-12, 01:51 PM||#1|
Imagine you had a torodial tank filled with a (super)conductive fluid that was flowing around the tank in a clock-wise direction. Could the minute differences in speeds between the liquid flowing on the inside of the torus and those on the outside -slowed due to friction - create an electric ch... | <urn:uuid:a65ef0ab-c2e3-4d1b-b61e-7ecc68e56a4e> | 3.03125 | 550 | Comment Section | Science & Tech. | 38.401347 |
Inconstant Constants; November 1998; Scientific American Magazine; by Musser; 2 Page(s)
Of all the assumptions that undergird modern science, perhaps the most fundamental is the uniformity of nature. Although the universe is infinitely diverse, its basic workings appear to be the same everywhere. Otherwise, how could w... | <urn:uuid:f91e8f43-a698-4daf-b6b8-8cd006ca1973> | 3.546875 | 217 | Truncated | Science & Tech. | 41.86231 |
This composite image of the Tycho supernova remnant combines X-ray and infrared observations obtained with NASA's Chandra X-ray Observatory and Spitzer Space Telescope, respectively, and the Calar Alto observatory, Spain. It shows the scene more than four centuries after the brilliant star explosion witnessed by Tycho ... | <urn:uuid:271ebd46-4827-4527-9eef-a03e8594bed9> | 3.1875 | 361 | Personal Blog | Science & Tech. | 53.53319 |
see photos below
Leigh is back in Maine and files this report on the field season:
I had to break this journal entry up into ‘The Science’ and ‘The Life’ because scientifically everything went smoothly – the difficulties came from everyday life activities.
Our objectives at the Allan Hills were similar to those at Mt. ... | <urn:uuid:064b0865-42f3-4379-8513-9601116bb8e4> | 2.78125 | 993 | Personal Blog | Science & Tech. | 54.180138 |
Le Brocque, Andrew F. and Zammit, Charlie (2010) Four years of sheep exclusion shows no changes in understorey composition in grazed woodlands of southern Queensland. In: Ecological Society of Australia 2010 Annual Conference: Sustaining Biodiversity - the next 50 Years (ESA 2010), 6-10 Dec 2010, Canberra, ACT, Austral... | <urn:uuid:c3b2bc5b-c3c0-44e4-997f-ec0b638b9c5f> | 2.796875 | 428 | Academic Writing | Science & Tech. | 29.46 |
Viking Data Suggests Life?, Universe Today via NASA's Astrobiology Magazine
"Researchers from universities in Los Angeles, California, Tempe, Arizona and Siena, Italy have published a paper in the International Journal of Aeronautical and Space Sciences (IJASS) citing the results of their work with data obtained by NAS... | <urn:uuid:840fa173-a093-4a20-9667-6d6caa9c8ed6> | 2.75 | 635 | Comment Section | Science & Tech. | 54.24985 |
A little-known meteor shower named after an extinct constellation, the Quadrantids will present an excellent chance for hardy souls to start the year off with some late-night meteor watching.
Peaking in the wee morning hours of January 3 (Thursday), the Quadrantids have a maximum rate of about 80 per hour, varying betw... | <urn:uuid:702c1212-bcaa-4733-a0b6-18c50a4f5a42> | 3.109375 | 275 | Knowledge Article | Science & Tech. | 50.325145 |
In the movie Terminator 3: Rise of the Machines, Arnie's fuel cells were twice shown to be extremely devastating when their stored energy was released.
In real life, how many grams of, say, gunpowder or TNT are equivalent to the energy stored in
- An AA alkaline battery
- A laptop battery
- An electric car battery
Woul... | <urn:uuid:ba244e90-005a-4ac1-805c-8d6f55bc2742> | 2.703125 | 111 | Q&A Forum | Science & Tech. | 36.285 |
It is remarkable that in the climate science debate, the ideal gas law and its consequences in dynamic systems has been variously forgotten, misinterpreted, denied and ignored. In order to clear up the misconceptions, obfuscations , ignorance, error, and denial, it is time to do some practical science in order to lay t... | <urn:uuid:a741d678-aca3-4d27-9cc1-ebef0f0708f3> | 2.71875 | 965 | Personal Blog | Science & Tech. | 41.118372 |
All about the world's ice
By Jack Williams, USATODAY.com
At the beginning of the 20th century, the world's attention turned to the polar regions as explorers raced to be first to reach the North Pole and then the South Pole.
Going into the 21st century, the Arctic and Antarctic, along with glaciers in other parts of th... | <urn:uuid:2c5cd1a4-c6e5-48cc-a673-2b4d5a78581a> | 3.78125 | 1,071 | Truncated | Science & Tech. | 57.1044 |
The Physics Classroom: Energy Transport and the Amplitude of a Wave Relations
Physics Front Related Resources
A related Physics Classroom tutorial that explores the relationship between wave frequency and period.
Other Related Resources
Visit The Physics Classroom's Flickr Galleries and enjoy a photo overview of the to... | <urn:uuid:05f30118-a9e8-4bd9-a2f3-ff511f4e2a3f> | 2.859375 | 90 | Content Listing | Science & Tech. | 32.754394 |
Improper rotations are described by 3-by-3 orthogonal matrices with a determinant of -1. A proper rotation is simply an ordinary rotation, which has a determinant of 1. The product (composition) of two improper rotations is a proper rotation, and the product of an improper and a proper rotation is an improper rotation.... | <urn:uuid:7ce98747-21a2-4813-b7ca-e8868d603be0> | 3 | 181 | Knowledge Article | Science & Tech. | 27.895769 |
By summer 2005, researchers in the Fluids Research Laboratory at Virginia Tech will be able to look for evidence of water on Mars by examining submicroscopic bubbles in martian meteorites, determine whether fluids and silicate melts trapped in volcanic rock can help predict future eruptions, and locate buried mineral d... | <urn:uuid:4408b3c9-9cb0-4c25-95a3-07f55a502c39> | 3.625 | 2,422 | Content Listing | Science & Tech. | 40.658177 |
此物種詳細資訊 King George Is. (Antarctic)
來源： Chwedorzewska 2008
On King George Island Poa annua spreads and inhabits areas of the Arctowski oasis in the vicinity of the Polish Antarctic Station. P. annua has been observed in the vicinity of the Polish Antarctic Station since 1985. Its origin still remains unknown. The abund... | <urn:uuid:7bc6813f-a9eb-439f-a0c4-022886bb54c7> | 2.875 | 330 | Knowledge Article | Science & Tech. | 57.199006 |
Search our database of handpicked sites
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Sorry for the late reply, was a busy day.
Had a better look at the mounds and deduced that it is infact a mound of Trinervitermes
. Which is in the same subfamily as the Amitermes just the size of the holes in the mound made me rethink slightly. They both exhibit blackened mounds and soldiers are characterized by a sno... | <urn:uuid:891ae86b-6a6b-4ff8-850f-3bde0cbed53e> | 3.203125 | 929 | Comment Section | Science & Tech. | 44.137216 |
Unlike other primates, the whites of human eyes contrast sharply with our colored irises and dark pupils. One theory suggests that our eyes evolved this way specifically to make it easier to figure out the direction of another person's gaze. If this theory is correct, you would expect humans to pay more attention to ey... | <urn:uuid:e1e5ae7b-2a9c-46e1-8ff0-6e7117fdd25e> | 3.34375 | 122 | Truncated | Science & Tech. | 29.18 |
San Antonio, Texas is saving water and saving the Texas blind salamander. The Texas blind salamander (Eurycea rathbuni) is a rare, endemic, aquatic salamander only 5 inches long that lives in underground cave streams. They have no functioning eyes and little skin pigment making them appear white. These unique salamande... | <urn:uuid:e28c2d50-98d6-4e7d-9044-b67a62fe2897> | 3.4375 | 241 | Truncated | Science & Tech. | 32.413003 |
The reason, in one word, is RUNAWAY.
Runaway is a descriptive term for what the scientists call abrupt irreversible rapid global warming, which would be global climate catatsrophe. It involves tipping points.
A 2012 paper By Prof C Duarte says The Arctic could Trigger Domino Effect Around the World.
The science says it... | <urn:uuid:c923e130-b14d-4e7a-984b-b82d62fc9490> | 4 | 1,215 | Knowledge Article | Science & Tech. | 33.687701 |
|Manatees are long-lived marine mammals whose diet consists of sea grass (Photo: S. Lutz)|
Benjamin S. Halpern et al. have published an article in the nature journal unveiling the "Ocean Health Index", a tool to measure the condition of the world's oceans and coastal ecosystems. The Ocean Health Index also includes a m... | <urn:uuid:8c129e0a-9d41-481b-b8db-0f1e1154e389> | 3.25 | 341 | Personal Blog | Science & Tech. | 45.009514 |
Developing OpenCL Programs Using Xcode
This chapter describes a streamlined process in which, using tools provided by OS X v10.7, you can include OpenCL kernels as resources in Xcode projects, compile them along with the rest of your application, and use Grand Central Dispatch as the queuing API for executing OpenCL co... | <urn:uuid:4d8342dc-94d5-4530-ae29-7f557690151d> | 3.25 | 1,084 | Documentation | Software Dev. | 44.562644 |
Vortices of water, called "eddies," form off the
northwestern coast of North America in the winter, and are particularly
large during El Niño winters when warm waters along the coast
flow northward at greater speed than normal. These eddies carry local
nutrient-rich waters far offshore into regions with low ambient nut... | <urn:uuid:9f9b898d-6dec-4d57-ae67-27a2c5383701> | 4.3125 | 3,648 | Knowledge Article | Science & Tech. | 53.798172 |
Diamagnetism is the property of an object or material that causes it to create a magnetic field in opposition to an externally applied magnetic field. It is a quantum mechanical effect that occurs in all materials; where it is the only contribution to the magnetism the material is called a diamagnet. Unlike a ferromagn... | <urn:uuid:f0b23490-e748-4a57-ac16-2849b23ebf85> | 3.84375 | 2,157 | Knowledge Article | Science & Tech. | 39.185894 |
A positive pion is an up and an anti-down. A negative pion is a down and an anti-up. What's a pion with an electrical charge of 0?
Up and anti-up.
Or down and anti-down.
Funny thing is, both of those have the exact same quantum numbers - parity, spin, baryon number and the rest. So a neutral pion can be a mixture of (u... | <urn:uuid:7bffc83d-962b-4557-97a7-e0cdfdec28e0> | 3.0625 | 405 | Q&A Forum | Science & Tech. | 69.053245 |
Raman Spectroscopy and Four-Wave Mixing in Sodium
In the 1920s, an Indian physicist named C.V. Raman noticed that
light incident on a variety of surfaces is sometimes scattered with different wavelengths
(Milonni 682). With the invention of the laser this phenomenon known as the Raman effect
could be studied extensivel... | <urn:uuid:67f34ba2-9ad0-42ed-90b3-be8929203f12> | 3.234375 | 874 | Academic Writing | Science & Tech. | 39.320759 |
An exponential function is a mathematical function of the following form:
f ( x ) = a x
where x is a variable, and a is a constant called the base of the function. The most commonly encountered exponential-function base is the transcendental number e , which is equal to approximately 2.71828. Thus, the above expression... | <urn:uuid:94440d24-4574-40cc-a8f2-52cb7e665588> | 3.84375 | 316 | Knowledge Article | Science & Tech. | 63.680103 |
C3-plant and C4-plant
philcorbett at ntlworld.com
Mon Jul 30 07:12:09 EST 2001
We also need to know the growing media. Moist warm organic compost would be
a source of CO2 and possible pathogens.
"Cereoid*" <cereoid at prodigy.net> wrote in message
news:yi_87.4908$2v1.1004094687 at newssvr17.news.prodigy.com...
> This i... | <urn:uuid:c283800b-a8d1-404a-a605-202443f299d0> | 2.875 | 742 | Comment Section | Science & Tech. | 68.542188 |
great spotted cuckoo
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.
...their hosts, compared with up to 72 percent of mismatched eggs. Few cuckoos have been studied intensively in terms of egg ... | <urn:uuid:4139a0f0-0291-4bdc-ad75-2e7c8276f0ed> | 2.703125 | 156 | Knowledge Article | Science & Tech. | 60.810308 |
Flooding of the Mississippi River near the St. Louis Gateway Arch in August, 1993.
Credit RMCO and NRDC (Figure 2, p.6, from the report “Doubled Trouble: More Midwestern Extreme Storms”)
Average frequency of days with 3 inches or more of precipitation per weather station per year. Dots indicate annual average frequency... | <urn:uuid:d6f10b5d-6610-4d95-9ee2-87744596db1a> | 2.96875 | 404 | Content Listing | Science & Tech. | 51.586667 |
Water On The Moon
Sat Sep 26 02:06:37 BST 2009 by Ignacio
Doesn't the Coran say that there is water on the moon?
Wasn't Cassini The First To Discover Water?
Sun Sep 27 05:37:19 BST 2009 by Paul Whitmore
Correct me if I'm wrong but wasn't it Cassini who first discovered water on the moons surface? If I remember correctl... | <urn:uuid:efa555b7-7ba6-4e29-9f8b-f0e9d0bd55f9> | 3.296875 | 213 | Comment Section | Science & Tech. | 72.276316 |
If you have started learning Objective c, this small tutorial on "Loops in Objective c" would be helpful. In this series of loop examples, i have discussed about...
The loop concept and the usage of it, is almost same as in C & C++ programming language. So, in this tutorial we have tried to explain the loop concept in ... | <urn:uuid:eff847a0-e096-47f4-bfc7-04e60cdaae9b> | 3.296875 | 206 | Tutorial | Software Dev. | 63.093985 |
Under classical physics, as Preskill explained on Caltech’s Quantum Frontiers blog, Alice and Bob can both have copies of the same newspaper, which gives them access to the same information. Sharing this bond of sorts makes them “strongly correlated.” A third person, “Carrie,” can also buy a copy of that newspaper, whi... | <urn:uuid:7ddfa94f-b543-4074-befc-642e1055e2dd> | 3.203125 | 954 | Knowledge Article | Science & Tech. | 33.420534 |
|OBJECTIVE||Discover the water cycle is more complex than just from the ground to the atmosphere.|
|OVERVIEW||Students will act as water molecules and travel through parts of the water cycle.|
|TOTAL TIME||30 minutes|
|SUPPLIES||A die for each student or each pair of students (or some device where a random number from ... | <urn:uuid:8e93205d-5bca-461d-946e-718f4411193c> | 3.921875 | 909 | Tutorial | Science & Tech. | 57.155328 |
Modeling and simulating the aftermath of hurricanes before they hit landfall is no easy task.
But Clint Dawson, director of the Computational Hydraulics Group at the Institute for Computational Engineering and Sciences (ICES), has taken on the challenge.
With accurate data and powerful computing resources such as the T... | <urn:uuid:45e8e93c-ae1d-4201-9bb0-396e76770749> | 3.015625 | 140 | Truncated | Science & Tech. | 21.199297 |
In a year marked by a relentless assault of extreme weather, several events stand out. Some, like the tornado that leveled Joplin, Missouri on May 22. were extraordinarily devastating and deadly. Others - such as the “Snowtober” storm that buried the Northeast under a crushing load of heavy, wet snow - were downright f... | <urn:uuid:92d8b565-6d8c-4117-83cb-d3dc7bd9c4ca> | 3.21875 | 1,804 | Listicle | Science & Tech. | 53.980458 |
The following methods can be defined to customize the meaning of
attribute access (use of, assignment to, or deletion of
for class instances.
nameis the attribute name. This method should return the (computed) attribute value or raise an AttributeError exception.
Note that if the attribute is found through the normal m... | <urn:uuid:2cf0b38c-69d9-4f5c-83ef-020ed3d0c8f7> | 3.515625 | 297 | Documentation | Software Dev. | 40.58338 |
A key part of Rhodes' analysis:
(...)however, for algae to grow, vital nutrients are also required, as a simple elemental analysis of dried algae will confirm. Phosphorus, though present in under 1% of that total mass, is one such vital ingredient, without which algal growth is negligible. I have used two different met... | <urn:uuid:1bb6c70c-2766-4277-85ef-9b39fe1afc3b> | 3.09375 | 614 | Personal Blog | Science & Tech. | 70.178818 |
See also the
Dr. Math FAQ:
Browse High School Sequences, Series
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Strategies for finding sequences.
- Infinite sums [6/26/1996]
Given the function f(x) = x^2/(1+x^2) find the sum f(1/n)+f(2/n)+...+
f(n-... | <urn:uuid:752e20f9-8b81-417d-9aff-1a1af7b91f7e> | 3.046875 | 1,970 | Q&A Forum | Science & Tech. | 87.984489 |
Sci. STKE, 24 July 2007
Genetics Whats the Buzz
Laura M. Zahn
Science, AAAS, Washington, DC 20005, USA
The residents of bee hives are well known to be closely related, but hives can often exhibit more genetic diversity than might be anticipated from theories on the benefits of cooperation among closely related individu... | <urn:uuid:413e7d02-0c01-46c8-b6f2-365f45d41570> | 3.34375 | 317 | Academic Writing | Science & Tech. | 46.630142 |
New satellite measurements of Arctic Ice shocked scientists. Chris Rapley suggests that the warming Arctic is involved in jet stream instability associated with increasing volatility in weather in lower latitudes, such as we are now experiencing. In other words, that gigantic heat dome and the US Great Drought of 2012 ... | <urn:uuid:f7057799-7ae4-4fb5-8615-b7fb12f68a7b> | 3.1875 | 1,299 | Comment Section | Science & Tech. | 54.488766 |
A solid non-uniformly charged cylinder, of radius R and charge
density ?(r) = (?oexp(-r/R))/r, is situated inside of a conducting
cylindrical shell of inner radius a and outer radius b
(a) Find the total charge contained in a length h of the charged
(b) Find the electric field for all values of r (that is, r<R,
R<r<a, ... | <urn:uuid:d8f42a9a-6ab9-464f-9c2a-3a179c2748b1> | 2.703125 | 140 | Q&A Forum | Science & Tech. | 80.403955 |
A walker in a city is at the green point in the upper-right corner of the plot. Her goal is the red point at the origin. Thus, at each intersection of streets, she goes either to the west or to the south. She has to go intersections to the west and intersections to the south. Suppose that at each intersection, there is... | <urn:uuid:f4eaf68d-2757-4920-b68c-e6f1fc8598cb> | 2.78125 | 487 | Tutorial | Science & Tech. | 73.929739 |
Name: Micheal N. B.
Date: November 2003
A chicken egg with the shell removed with vinegar is used
as semipermeable membrane to demonstrate to students the movement of
water by osmosis. In addition to a concentrated sugar and distilled
water setup - I would like to include an isotonic setup. If sucrose is
used as the so... | <urn:uuid:cfb0c06c-ae41-4b0e-a056-a9fcbedea231> | 2.84375 | 172 | Q&A Forum | Science & Tech. | 39.465794 |
Squirt Gun Pressure
I need information on how air pressure works in a water
gun that is pumped up like the super soakers. Why? Well, I am a 10 year
old doing a science project on figuring out the ideal number of pumps to
use for the best distance and water soakage. I have gathered all of my
data and made my charts and ... | <urn:uuid:2183128f-f9b0-4cff-ba23-43eaf1264fdf> | 2.84375 | 852 | Q&A Forum | Science & Tech. | 61.211032 |
An uncommonly thin snowpack that year had been chased by a windy spring that came weeks early, hot and dry. Forest fires and heat waves soon followed. Farm crops withered, suburban laws crinkled and foreheads wrinkled at this long-ignored limit to growth. Water was front-page news.
Dillon Reservoir was the emblem in Co... | <urn:uuid:ada07d89-043a-4950-81d8-829da82215bf> | 3.015625 | 2,265 | Truncated | Science & Tech. | 48.873976 |
This illustration shows the route traveled by oil leaving the
subseafloor reservoir as it travels through the water column to the
surface, and ultimately falls back to the seafloor. The oil remaining
after weathering falls in a plume shape onto the seafloor where it
remains in the sediment.
(Jack Cook, Woods Hole Ocean... | <urn:uuid:74f25ac2-629d-4ca7-9985-ad0de5a1d626> | 2.703125 | 77 | Knowledge Article | Science & Tech. | 29.03 |
Droughts are nothing new to Wisconsin and the United States. In fact, nearly every year, at least one portion of the country experiences drought, whether it is moderate, severe, or extreme. Droughts are caused by a long period of little to no rainfall. They are quiet – no damaged buildings, uprooted trees, or twisted s... | <urn:uuid:509a7c50-7582-40c3-8094-03118d6d541a> | 3.28125 | 497 | Personal Blog | Science & Tech. | 59.773208 |
|photo credit: woodleywonderworks|
Well, it’s that time of year again… we have started to get Attacus atlas, aka Atlas moths, YEAH!!!! This is always an exciting time for me because I get to tell everyone who keeps asking me that they are finally here! Last week, I received 60 atlas moth cocoons from Malaysia and the P... | <urn:uuid:7af91dfe-f211-4a9c-8e00-be65f3210926> | 2.78125 | 599 | Personal Blog | Science & Tech. | 53.519609 |
The only information one has about a particle
(or a system for that matter) in quantum physics is its wavefunction
The wavefunction is related directly to the probability distribution of the particle. In other words, the wavefunction allows one to find out the probability that the particle will be found in a given plac... | <urn:uuid:068c1311-94b6-4f0a-8605-75fb6bcaa225> | 2.984375 | 281 | Knowledge Article | Science & Tech. | 39.785055 |
by Katie Bowell, Curator of Cultural Interpretation
The International Institute for Species Exploration and an international team of taxonomists (the people who classify organisms) just released their list of the top ten new species discovered in 2009 and boy oh boy, it’s a doozy!
The winners this year include the Gree... | <urn:uuid:e78b7194-5fb8-4eb7-9d64-5b8bf37c20a7> | 3.0625 | 454 | Personal Blog | Science & Tech. | 45.249213 |
Hello Everyone, please help me on this dynamics questions!
A boy pulls a sled across ice by exerting a force of F kg wt. The mass of the sled is m kg, the friction between sled and ice is negligible but the sled is subject to air resistance in kg wt of magnitude k times the speed. If the sled starts from rest find expr... | <urn:uuid:cc6de0ff-2637-444e-a02f-13d5216ede38> | 2.953125 | 98 | Q&A Forum | Science & Tech. | 61.328333 |
My question is regarding the interference in sound waves
of slightly different frequencies which indeed produces beats. If
three tuning forks of frequencies, say, 401Hz, 402Hz and 403Hz are
vibrated simultaneously then what will be the beat frequency heard?
Since the first two forks differ by one Hz The second two do a... | <urn:uuid:3ad7e785-1dc9-4fc1-bba9-9e944d19bbb3> | 2.921875 | 691 | Q&A Forum | Science & Tech. | 66.323911 |
The sample experiments shown here illustrate the behavior of fluids,
flames, and mechanical systems in microgravity. After each description,
a picture of the experiment, followed by its appearance in normal
gravity (1g) and then micro-gravity (ug) are given.
The weight (W) of a body of mass (m) in a gravitational field... | <urn:uuid:1e82e1f1-79a7-4127-98c3-26228aa13a8e> | 3.984375 | 677 | Documentation | Science & Tech. | 51.004242 |
Biodiversity is the degree of variation of life forms within a given species, ecosystem, biome, or an entire planet. Biodiversity is a measure of the health of ecosystems. Biodiversity is in part a function of climate. In terrestrial habitats, tropical regions are typically rich whereas polar regions support fewer spec... | <urn:uuid:d576f567-94b6-4429-adaf-3d832767aa8b> | 4.125 | 872 | Knowledge Article | Science & Tech. | 30.097097 |
New 'walking' fishes discovered in Gulf oil-spill zone
Two new fish species — with pancake-flat bodies, wiggling lures on their faces, and elbowed fins for "walking" on the seafloor — have been discovered in the path of spewing Gulf of Mexico oil.
One of these pancake batfishes lives in the northern Gulf where oil is a... | <urn:uuid:ad37b0b5-c837-47c9-8957-3af7f5c18b3f> | 3.15625 | 406 | Truncated | Science & Tech. | 40.101185 |
Which "the" models would those be?
The models the IPCC used
in their report. This graphic shows the simulated forcings of TSI, Volcanism, Well mixed GHGs, ozone, aerosol and the sum of all of the forcings combined. Note that the Greenhouse Signature as PREDICTED by the models looks TOTALLY different than if it were for... | <urn:uuid:be600b42-c3ae-4d4d-8766-45f8867a9464> | 3.265625 | 383 | Comment Section | Science & Tech. | 52.642353 |
Tell the audience only that you're immersing a ping-pong ball in liquid nitrogen. Ask them to predict what will happen (a good guess would be that it will collapse in on itself). The unexpected result will give them a good opportunity to apply some bits of knowledge they possess (depending on their age: that liquid nit... | <urn:uuid:d3029c13-d289-42a7-a523-4cf0e3bba578> | 3.09375 | 396 | Tutorial | Science & Tech. | 45.16851 |
Country: United States
Date: Summer 2009
Are mutations [like the increase in number of limbs on a
frog an example of] an increase in genetic information to a genome?
If not, what is it?
A lot of terms you used seem to be used incorrectly, so I want to start with
First, a mutation refers to a change in genetic informati... | <urn:uuid:bba1a394-924f-4422-af3b-b6f40e70311e> | 3.1875 | 719 | Q&A Forum | Science & Tech. | 41.307564 |
The Scanning Tunneling
The scanning tunneling
microscope (STM) is a type of electron microscope
that shows three-dimensional images of a sample. In
the STM, the structure of a surface is studied using
a stylus that scans the surface at a fixed distance
An extremely fine
conducting probe is held close to the sample.
Ele... | <urn:uuid:61e7888d-a490-4429-a9ed-c8f6564a71a3> | 3.859375 | 315 | Knowledge Article | Science & Tech. | 38.686854 |
Mechanics: Vectors and Projectiles
Vectors and Projectiles: Audio Guided Solution
A weather report shows that a tornado was sighted 12 km south and 23 km west of your town. The storm is reported to be moving directly towards your town at a speed of 82 km/hr.
a. What distance from your town was the tornado sighted?
b. A... | <urn:uuid:d7c2a4bd-12e8-4983-b028-67d5ad1af6d3> | 3.296875 | 318 | Tutorial | Science & Tech. | 63.060494 |
Malloc and free provide a simple memory allocation package. Malloc
returns a pointer to a new block of at least size bytes. The block
is suitably aligned for storage of any type of object. No two
active pointers from malloc will have the same value. The call
malloc(0) returns a valid pointer rather than null.
The argum... | <urn:uuid:0e8e274a-6ee1-405e-a9b2-d0c042ebced1> | 3.28125 | 596 | Documentation | Software Dev. | 49.05135 |
About Table Views in OS X Applications
A table view displays data for a set of related records, with rows representing individual records and columns representing the attributes of those records. For example, in a table of employee records, each row represents one employee, and the columns represent such attributes as ... | <urn:uuid:02807313-d1ed-4c10-965c-d6eca2edbc91> | 3.640625 | 1,357 | Documentation | Software Dev. | 35.083459 |
A Sydney marine ecologist researching the immense potential of seagrasses to store carbon for thousands of years, and therefore highlighting its conservation value.
Clink here to watch the finalist profiles
Peter Macreadie's love of fishing and snorkelling in seagrass environments makes his work as a marine ecologist a... | <urn:uuid:34759185-7d4c-4c0e-82dd-53c9a5e664b1> | 3.4375 | 1,376 | Audio Transcript | Science & Tech. | 48.058344 |
You can use Open SQL to store character strings and binary
data as strings in database columns. There are two kinds of strings in the database, short strings
and long strings, which differ in the form of how the data is stored in the database. Whether a string column is a short or a long string, is specified in the ABA... | <urn:uuid:8f820b01-1789-468a-b3b5-a915eca9d4a9> | 3.25 | 408 | Documentation | Software Dev. | 51.916213 |
The very basic reason LEP stopped going to higher energies ( it reached over 200GeV center of mass, at the last stage, LEPII) and the tunnel was used for LHC is synchrotron radiation .
Note that radiated power is proportional to 1/m^4
It is not possible to feed a circular beam of electrons the energy needed to raise it... | <urn:uuid:764bae83-d92a-4736-9075-1b5d3a71bf6e> | 3.734375 | 289 | Q&A Forum | Science & Tech. | 44.445243 |
is one of
the most widely used Java APIs for RDF and OWL, providing services
for model representation, parsing, database persistence, querying
and some visualization tools. Protégé-OWL has always had a close relationship
with Jena. The Jena ARP parser is still used in the Protégé-OWL
parser, and various other services ... | <urn:uuid:27c6a507-04a9-416b-953e-31cb2459321f> | 2.8125 | 462 | Documentation | Software Dev. | 46.311157 |
Every January, I journey out to the American Astronomical Society for its annual Winter Meeting. And, every time, I’m amazed at new bit of information about the universe. Today’s revelation (and it’s only Day 1 of the meeting), is that the Milky Way Galaxy is populated with many planets — in fact, one team of scientist... | <urn:uuid:d8631f5f-75a0-40b7-bc48-e63ffd4a612c> | 3.125 | 386 | Personal Blog | Science & Tech. | 57.141572 |
To fill the Schrödinger equation, , with a bit of life, we need to add the specifics for the system of interest, here the hydrogen-like atom. A hydrogen-like atom is an atom consisting of a nucleus and just one electron; the nucleus can be bigger than just a single proton, though. H atoms, He+ ions, Li2+ ions etc. are ... | <urn:uuid:4170f328-976f-4cb8-95c6-320a4caaa7ba> | 3.640625 | 1,908 | Tutorial | Science & Tech. | 53.715206 |
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.
...astronauts, who expect to fly on several space missions during their time at NASA, there is a third category of individuals who have gone into ... | <urn:uuid:d62831c4-6058-49e7-b5d5-20d5d94ce180> | 2.9375 | 199 | Truncated | Science & Tech. | 41.98146 |
[quote:left to right]Setting aside the issue of mass extinctions caused by external sources: volcanism, asteroids/comets etc., most species are kept near optimal population levels by disease and predation. When a species is dropped into a small ecological niche like the reindeer herd on St. Matthews Island, it may be t... | <urn:uuid:2bde11a4-69eb-41dc-91b7-9de3d714b8e2> | 2.90625 | 639 | Comment Section | Science & Tech. | 53.473153 |
An astronaut or cosmonaut is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft. While generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space, including scientists, politicians, journalists, and tour... | <urn:uuid:b11c11db-ea15-41c3-9dee-e3c4ea9a7592> | 3.34375 | 3,573 | Knowledge Article | Science & Tech. | 44.134912 |
ONE of astronomy's great orbiting observatories has breathed its last. On 14 January, the liquid helium cooling one of the Planck space telescope's two photon sensors ran dry, ending a mission to map the big bang's echo.
Planck's data will help tease apart the large-scale structure of the universe and determine how it ... | <urn:uuid:153be525-69f3-4d8b-9b54-0fdf76e6a3da> | 3.40625 | 272 | Truncated | Science & Tech. | 51.373684 |
Tue Dec 02 22:46:12 GMT 2008 by Michael Paine
Over the lifetime of the Earth it is estimated that 4 star systems have passed within 1000au of our Sun. Exchange of comets between Ooort Clouds seems likely during these encounters.
Thu Dec 04 10:50:23 GMT 2008 by Lindsay
This comment rings true. The outer regions of Sol's... | <urn:uuid:255426ee-7937-4ea8-8d0c-39409ddea2ce> | 3.09375 | 261 | Comment Section | Science & Tech. | 70.223545 |
Summary: Science Goals for an Antarctic Large Infrared Telescope
MG. Burton, J.WV. Storey and M.C.B. Ashley
Joint Australian Centre for Astrophysical Research in Antarctica,
School of Physics, University of New South Wales, Sydney NSW 2052, Australia
Over the past few years, site-testing at the South Pole has revealed ... | <urn:uuid:879aa3c7-7c5a-4675-99f1-f034dad32062> | 2.90625 | 363 | Academic Writing | Science & Tech. | 33.705682 |
Solar Energy Uses
Solar energy is nothing but the energy which is acquired from the sun light. As is common knowledge, light is a form of energy. This energy is in the form of electro magnetic radiations. The solar energy is harnessed using, the solar receptors. The conversion of the solar energy in to electrical energ... | <urn:uuid:cf13ac83-40ee-49a5-99ac-fbe2f4b54790> | 3.046875 | 529 | Knowledge Article | Science & Tech. | 41.941137 |
Subsequent research found that the pupils of more intelligent people (as defined by their Scholastic Aptitude Test scores) dilated less in response to cognitive tasks compared with those of lower-scoring participants, indicating more efficient use of brainpower.
Scientists have since used pupillometry to assess everyth... | <urn:uuid:4947d3df-97fd-4e7a-8b63-cc0710bb89fd> | 2.9375 | 573 | Knowledge Article | Science & Tech. | 20.718707 |
Using the left mouse button, select piece and drag into position. Pressing the right mouse button rotates piece. If you need a hint, press the "V" key to view the whole image. Change the number of pieces: 9 | 24 | 48 | 160.
The atmosphere is a cloud of gas and suspended solids extending from the Earth's surface out man... | <urn:uuid:de6e39bb-09a7-4a9f-ac9b-1d440741b5af> | 3.5 | 160 | Tutorial | Science & Tech. | 60.838173 |
SOUTH Africa, with its small science and research budget, tends to focus on the things it’s good at, or fields in which it has a geographic advantage. It is difficult for a country that spends 0.96% of its $408.24bn gross domestic product on research to compete with the likes of the US and China without some kind of ad... | <urn:uuid:17de557e-48e5-46e1-bdf0-e45fc0fb89ad> | 2.6875 | 2,768 | Nonfiction Writing | Science & Tech. | 35.475209 |
What’s negative 2 to the fourth power? 16? -16? If you put “-2^4″ into the TI-83, you get -16. But we know that (-2)(-2) = 4 and (-2)(-2) = 4, and (4)(4) = 16. So why does the calculator give us -16?
This post is no doubt for the high schooler and not for someone addicted to the )( buttons on the calculator like I am. ... | <urn:uuid:77bf34dc-a09a-40f6-a114-53bd01690df5> | 3.71875 | 376 | Personal Blog | Science & Tech. | 90.891747 |
The effect of pH on enzyme actvity
The pH of a solution can have several effects of the structure and activity of enzymes.
For example, pH can have an effect of the state of ionization of acidic or basic amino acids. Acidic amino acids have carboxyl functional groups in their side chains. Basic amino acids have amine f... | <urn:uuid:d9085c81-79a2-4459-9aea-2fce83c3a71d> | 3.421875 | 293 | Knowledge Article | Science & Tech. | 39.356981 |
Our climate has changed many times during the planet’s history, with events ranging from ice ages to long periods of warmth. Historically, natural factors such as volcanic eruptions, changes in the Earth’s orbit, and the amount of energy released from the Sun have affected the planet’s climate. Beginning late in the 18... | <urn:uuid:3315b9ae-f5e1-4f73-8f0d-a691d67fc8ec> | 4.09375 | 799 | Knowledge Article | Science & Tech. | 42.932938 |
This is a large group of diverse unicellular and multicellular aquatic plants; they grow in both fresh water and seawater and are used commercially as a source of thickeners (agar, agarose, algin, carrageenan) and pigments such as beta carotene.
Some countries harvest algae as food. Spirulina is produced by Israel and ... | <urn:uuid:4cea5816-38c1-49c1-b43c-cf7be69c88e2> | 3.234375 | 219 | Knowledge Article | Science & Tech. | 32.371118 |
Natural CatastrophesEarthquake. Earthquakes and floods will through 2300 still occasionally kill tens of thousands of humans in developing societies. Of even greater historical consequence would be a possible massive earthquake in Tokyo, San Francisco, or Los Angeles. Such a quake could cause on the order of a trillion... | <urn:uuid:39d5c7f5-26c9-48d6-83fd-f55ffc22079e> | 3.34375 | 1,843 | Knowledge Article | Science & Tech. | 32.638328 |
Installs your own termination function to be called by unexpected.
Pointer to a function that you write to replace the unexpected function.
The set_unexpected function installs unexpFunction as the function called by unexpected. unexpected is not used in the current C++ exception-handling implementation. The unexpected... | <urn:uuid:59c64d6a-f35b-49db-bbc4-c2c2ecb44139> | 2.796875 | 411 | Documentation | Software Dev. | 30.699786 |