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What Charles Adams and colleagues at Durham University have now done is come up with a way of storing individual optical photons in highly excited states of an atomic gas. Once stored, the photons can be made to interact strongly, before being released again. An important feature of the technique is that it uses microw... | <urn:uuid:58d7d52f-7870-40d6-998f-d61f9217c809> | 2.6875 | 107 | Personal Blog | Science & Tech. | 23.810352 |
Driving home the other night, I was teasing my 4-yr old daughter (as I often do). We were talking about what sorts of games to play when we got home and I suggested that we could spend our time poking Lucy’s baby brother Daniel in the eye. I also pointed out that we’d have to take turns and asked Lucy which of us shoul... | <urn:uuid:12eba3a3-cee4-4078-8e5c-65fc51dce414> | 2.734375 | 911 | Personal Blog | Software Dev. | 60.073833 |
The prediction is the sea level will rise about 3 feet.
"CapNemo" has been going to global warming questions and copying a statement pooh-poohing the threat. His statement is misleading and incorrect.
He says it’s only increased by 1 degree (F) in 125 years. Actually, it’s increased by twice that. If you look at the li... | <urn:uuid:b7504dd9-1b6e-43d4-b1b2-2c8c3d95d7b6> | 2.71875 | 774 | Comment Section | Science & Tech. | 72.407083 |
The Web Services Description Language (WSDL) (see Resources) specification provides a simple XML-based vocabulary for describing XML-based Web Services that are available over the network. The services themselves communicate using the Simple Object Access protocol (SOAP), HTTP, SMTP, or by some other means; WSDL, howev... | <urn:uuid:b33ce72a-6072-4220-b713-e32995620d94> | 2.921875 | 4,207 | Documentation | Software Dev. | 44.215354 |
If 15 grams of table salt is used how many moles of sodium sulfate are produced
can you help with this one Find the area of the regular polygon. Round your answer to the nearest tenth. the individual sides are 10 the radius is 13.07
The area of a parallelogram is 420 centimeters squared and the height is 35 cm. Find th... | <urn:uuid:ab646088-86f2-47bb-aa3d-0d55f617adec> | 3.796875 | 353 | Q&A Forum | Science & Tech. | 80.959718 |
Saguaro National Park AQRV's
Most surface waters in Saguaro NP are likely to be well-buffered and, as a result, insensitive to acidic atmospheric deposition because of an abundance of base cations in underlying park soils and rocks. However, studies currently underway have identified certain soils in the park that appe... | <urn:uuid:94f282ab-8936-4ed9-8a3d-519178148f5a> | 3.5 | 543 | Knowledge Article | Science & Tech. | 20.576164 |
Shuttle's rate of descent
When the shuttle burns out of orbit, What is its rate of descent?
During daylight hours, at what altitude does it become a naked eye object?
I have watched a shuttle land. I saw the next shuttle that went up
after the "Challenger" disaster land at Edwards Air Force Base in California.
You *hea... | <urn:uuid:5ce1445f-ab76-4f29-9094-6a6bde2a7625> | 3.3125 | 441 | Knowledge Article | Science & Tech. | 63.060791 |
Name: j middle school
Date: Around 1993
How do space ships get off the ground?
Gravity pulls on any object near the earth, including you, and a spaceship.
To get off the ground, you have to push yourself up harder than the earth is
pulling you down. When you jump in the air, you are pushing against the
ground. When a b... | <urn:uuid:ef3ed1fb-d0ab-4e31-a57b-d28dbb4d9c15> | 3.90625 | 217 | Knowledge Article | Science & Tech. | 76.759091 |
Web edition: May 21, 2010
Print edition: June 5, 2010; Vol.177 #12 (p. 4)
SOLVING OF SUN’S RIDDLES — Future space probes may skim as “close” as two million miles from the sun’s visible surface, a report to the National Academy of Sciences suggests. Before this can be done, however, greatly improved materials must be de... | <urn:uuid:82d05d41-10b1-4574-842a-64960733310c> | 3.328125 | 173 | Truncated | Science & Tech. | 50.993251 |
February 15, 2013
Julie Larsen Maher ©WCS
The beaver is one of nature’s most skillful architects, but it doesn’t just create lodges for its own toothy kin. The dams this engineering rodent builds can create water storage ponds that provide habitat for entire communities of wildlife, and ensure streams flow even when th... | <urn:uuid:3f19590d-6c4e-4a0d-be3f-ffaf1ad5fc30> | 3.4375 | 166 | Truncated | Science & Tech. | 37.757182 |
This cartoon shows some of the gases in the lowest layer of Earth's atmosphere. Most of the gas is nitrogen (N2). There is also a lot of oxygen (O2). The cartoon also shows carbon dioxide (CO2), water vapor (H2O), methane (CH4), sulfur dioxide (SO2), and carbon monoxide (CO).
Image courtesy UCAR, modified by Windows to... | <urn:uuid:104a0940-cd45-463d-bb43-040d869f62cd> | 3.03125 | 90 | Truncated | Science & Tech. | 55.763475 |
The original plan was for three N1 boosters to assemble a 200 tonne payload in low earth orbit. This would launch the original L3 to a direct landing on the moon and return. By comparison, Chelomei's UR-500 for the manned lunar flyby mission put only 20 tonnes in low orbit. However the leadership was only willing to fu... | <urn:uuid:5dc88563-c04f-4cba-a1cb-0bb4f4b1c56c> | 3.046875 | 509 | Knowledge Article | Science & Tech. | 52.568796 |
The radio telescope can see much more than an optical telescope. Things that have been discovered in the universe would not have been discovered if it were not for the radio telescope.
The inventor of the radio telescope is Grote Reber. He was born in Wheaton, Illinois, in 1911. As an adult he was an American engineer ... | <urn:uuid:16da6728-1f3e-4596-b408-788b413fefc4> | 4.125 | 1,398 | Nonfiction Writing | Science & Tech. | 60.701961 |
See also the
Dr. Math FAQ:
3D and higher
Browse Elementary History/Biography
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
About Roman numerals.
- Adding and Subtracting Roman Numerals [10/07/1997]
Do you have any suggestions for how to teach add... | <urn:uuid:b7af8e32-cc39-45db-8e00-f0f1235b2589> | 3.59375 | 1,359 | Q&A Forum | Science & Tech. | 66.247325 |
Find the equation of the normal lines to the curve which is parallel to the line
Please answer in steps..
First you need to find the derivative:
Then, from the equation of the line you are given, you see that the slopes of the normal line is -2 ; and since you want the slope of the tangets, you get the opposite recipro... | <urn:uuid:eebbff61-2488-4284-ad38-0204028e923e> | 3.0625 | 136 | Q&A Forum | Science & Tech. | 68.398041 |
Research Article at the Digital Library for Physics and Astronomy. Their website is hosted by the High Energy Astrophysics Division at the Harvard-Smithsonian Center for Astrophysics. The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smiths... | <urn:uuid:1a5525bc-32b2-4511-9ca6-0470d238ff2b> | 2.75 | 636 | Academic Writing | Science & Tech. | 35.509176 |
This laser is a type of ultraviolet laser often used in UV photolithography in eye surgery.
The term excimer comes from excited dimer English (excited dimer)
This uses a combination of inert gas such as argon, krypton or xenon, with reactive gas. Under appropriate conditions of electrical stimulation, a pseudo-molecule... | <urn:uuid:176e6d5d-c545-42ca-b7fd-7a1794baf36f> | 3.375 | 350 | Q&A Forum | Science & Tech. | 26.735897 |
The gender issue
Would you like to become a mathematician, or rather stick to being a woman? There are of course many people who are both, and very successful ones at that, but the fact remains that women are still under-represented in maths-based careers and degree courses. They are also twice as likely to drop out of... | <urn:uuid:e301aab9-c870-4fd4-91b4-37a44aea8966> | 2.734375 | 670 | Comment Section | Science & Tech. | 45.8025 |
The more you understand, the less you have to memorize.
A good example is trigonometric identities, of which there are quite a number. Should a student memorize trigonometric identities? Well, at first, it is probably wise to memorize a few of them. Part of a teacher’s job is to help students identify what is essential... | <urn:uuid:2446cfd4-3abc-4a4e-bf31-7b1fc7dc4439> | 3.65625 | 1,289 | Personal Blog | Science & Tech. | 49.962752 |
Adam Eyre-Walker has published a review of adaptive evolution in a few well studied systems: Drosophila, humans, viruses, Arabidopsis, etc. These organisms have been the subject of many studies that used DNA polymorphism, DNA divergence, or a combination of the two to detect natural selection in both protein coding and... | <urn:uuid:887c498c-f3fe-4e55-8300-1cdb016bde5b> | 2.953125 | 1,020 | Personal Blog | Science & Tech. | 22.560526 |
Saturn's 'day' shorter by five minutes
An analysis of Saturn's atmosphere has resulted in the definition of the planet's 'day' becoming somewhat shorter.
According to a study in the journal Nature, the time it takes the ringed behemoth to complete a spin on its axis is 10 hours, 34 minutes and 13 seconds, more than fiv... | <urn:uuid:4a3617fe-ae0f-49bf-8354-0e8cd3687561> | 3.515625 | 509 | Truncated | Science & Tech. | 40.939761 |
In light of the publishing of their new book, the authors of Climate Change -- Past, Present & Future: A Very Short Guide gave a lecture this past Saturday, April 25th, outlining the key points they hoped to make by publishing this work.
According to Dr. Warren Allmon, one of the three authors of this publication, the ... | <urn:uuid:ce722ed8-a2f7-4cdd-801f-98c68e9752e5> | 3.375 | 1,244 | Personal Blog | Science & Tech. | 40.645448 |
Joined: 16 Mar 2004
|Posted: Fri May 08, 2009 9:45 am Post subject: Enzyme Coat Kills Germs, Digests Stains
|A way to attach a coating of 'live' enzymes onto plastic and other materials could lead to clothes that digest stains as soon as they occur, or kitchen surfaces able to kill bacteria.
US researchers have shown t... | <urn:uuid:1e254efc-ab4d-4c34-b3d7-b391b86a7301> | 2.984375 | 749 | Comment Section | Science & Tech. | 33.686625 |
|The atmosphere that protects us from gamma rays prevents us from directly observing them from the ground.|
A gamma ray is a photon more energetic than an X-ray (more than about 50 keV). Gamma rays are created from nuclear reactions or particle accelerations. Gamma rays are the most energetic photons of the electromagn... | <urn:uuid:22acc8c9-1b21-4e18-a593-a22cd5db46b2> | 3.984375 | 126 | Knowledge Article | Science & Tech. | 46.897941 |
Titin: derived from the Greek titan (a giant deity, anything of great size). This is a fitting name considering its name. Because it is the largest known protein it also has the longest IUPAC name which starts with “methiony...” and ends with “...isoleucine” and contains about 1.5 thousand letters in between.
This make... | <urn:uuid:98683c9c-039d-4884-8446-0f2a6f12cb80> | 3.015625 | 186 | Knowledge Article | Science & Tech. | 67.268316 |
Carbon nanotubes are one of the leading-edge ingredients of the nanotech revolution. The tiny, cylindrical tubes made of a lattice of carbon atoms have potential as strengthening fillers in products such as tennis racket handles and brake pads. At a higher level, the tubes are being considered for use in electronic dev... | <urn:uuid:3ce47252-5b50-449f-9dd9-bcb0b244df48> | 3.84375 | 284 | Truncated | Science & Tech. | 23.741864 |
Excerpt from the book Darwin’s Dangerous Idea, Daniel dennett.
Danny Hillis, the creator of the Connection Machine, once told me a story about some computer scientists who designed an electronic component for a military application (I think it was part of a guidance system in airplanes). Their prototype had two circuit... | <urn:uuid:90e7a2e7-b32c-4bcb-b5dc-2a07ca61f341> | 2.9375 | 236 | Content Listing | Science & Tech. | 39.413237 |
Scripts and Forms
WAI Definition (Checkpoints 6.4, 8.1, 9.2, 9.3)
Ensure that user interfaces are device-independent and use logical device-independent event handlers.
Ensure that scripts and applets are accessible.
Ensure that it is possible to logically interact with the site using keyboard and/or mouse input/output ... | <urn:uuid:2035f965-ed4d-4653-8e5a-e8d3c164036c> | 3.34375 | 745 | Tutorial | Software Dev. | 35.272999 |
Mathematical model of the groundwater system in this area includes 13 types of data and spans multiple aquifers over more than a century. This enables us to assess the quantity of groundwater, where and how it is being used, and how pumping affects it.
Links to information on species of frogs, toads, and salamanders lo... | <urn:uuid:8ee37feb-f8e7-47f3-8e65-0e361aa3e93b> | 3.65625 | 229 | Knowledge Article | Science & Tech. | 29.680632 |
12 became Hurricane Katrina in Aug. 2005
The Weather Channel
Week continues with "Hurricane Force", an all new documentary offering
the definitive look at one of the most powerful forces of nature.
Cooks in the
kitchen follow recipes with specific ingredients and steps to achieve
culinary success. Leave out an importan... | <urn:uuid:a6156cf4-6b30-46da-ad9f-64353507c89d> | 2.84375 | 498 | Personal Blog | Science & Tech. | 54.8825 |
Last time, I discussed how El Niño events make normally dry places in the tropics rainy and normally rainy places dry. This redistribution of rainfall generates waves in the atmosphere that disrupt normal weather patterns around the world. El Niño is not the only process that redistributes rain in the tropics. Waves in... | <urn:uuid:ec9436a1-a691-470c-9ea6-47fc4399749c> | 3.953125 | 1,062 | Knowledge Article | Science & Tech. | 40.441241 |
The science world is abuzz with news of a strange new life form found in California’s Mono Lake: Researchers report that they’ve discovered a bacterium that can not only thrive in an arsenic-rich environment, it can actually use that arsenic to build its DNA. If the researchers, who published their findings in Science,... | <urn:uuid:7ac0b2b1-65f0-4cf3-9128-ee7175bc5705> | 3.21875 | 416 | Content Listing | Science & Tech. | 53.416721 |
As chance would have it, the night after writing this post about the equations shown in science fiction, an episode of Eureka aired in which Sheriff Carter was faced with the pictured board full of equations.
Carter, not the most technical of men, had to learn the equations in order to have chance at stopping a runaway... | <urn:uuid:3626ac04-979c-4dcd-8bee-27f483915413> | 3.6875 | 871 | Personal Blog | Science & Tech. | 47.424139 |
Posts Tagged: washboarding
Ever seen honey bees engaging in washboarding?
It's a behavior so named because they look as if they're scrubbing clothes on a washboard or scrubbing their home.
It occurs near the entrance of the hive and only with worker bees. They go back and forth, back and forth, a kind of rocking moveme... | <urn:uuid:a7d754c7-3950-4cc0-96ab-c1ac14f48421> | 2.75 | 741 | Personal Blog | Science & Tech. | 46.759979 |
1) The Inner Core - The inner most section of the Earth is called the inner core, it is basically the round center of our planet. This gigantic sphere is over 2700Km in diameter and is composed of iron and nickel. Despite having a temperature between 4000-6000 degrees Celsius, this giant mass is a solid, due mainly to ... | <urn:uuid:01ae396d-dbed-4acc-8e95-4304d73f1869> | 4.25 | 663 | Knowledge Article | Science & Tech. | 51.621023 |
|Monday||22 December 2003||8:41pm MST||2003-12-23 UTC 0341|
Small objectsIn the period from yesterday back to December 13th, when A/CC Major News last summarized observations of the smallest near-Earth asteroids [fn], ten of these objects were tracked, including four new discoveries. 2003 XZ12, YN1, and YR1 were found ... | <urn:uuid:70e637fc-0bae-4ef7-9afb-dad7102459f5> | 2.734375 | 1,118 | Content Listing | Science & Tech. | 53.591159 |
(Submitted September 30, 1997)
I am a 6th grader and I know a lot of the constellations by name and enjoy
looking at the stars
and sky at night. This past weekend while camping our Girl Scout Troop
went star gazing in an open field. It was really dark and really
I really like to look at stuff on the Internet about the ... | <urn:uuid:d1705535-3300-4ed2-a656-58b7a5bc1056> | 3.453125 | 1,009 | Q&A Forum | Science & Tech. | 65.670239 |
Manual Section... (2) - page: sigsuspend
NAMEsigsuspend - wait for a signal
int sigsuspend(const sigset_t *mask);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONsigsuspend() temporarily replaces the signal mask of the calling process with the mask given by mask and then suspends the ... | <urn:uuid:8598e73a-97cd-4007-b478-9d9f43a57846> | 2.828125 | 454 | Documentation | Software Dev. | 55.650134 |
My colleague's daughter wanted to be a stop sign for Halloween, and he needed to cut out such a sign from a piece of cardboard that was 3 feet by 4 feet. What cuts did he make so that the stop sign (a regular octagon) was as big as possible?
Intuitively, we want to make the height as large as possible, leaving a little... | <urn:uuid:018f65eb-cb59-4da9-b762-687e9e5ebd31> | 3.1875 | 390 | Q&A Forum | Science & Tech. | 69.320844 |
Drought is a normal, recurring feature of the climate in most parts of the world.
As a drought persists, the conditions surrounding it gradually worsen and its impact on the local population gradually increases. Droughts go through three stages before their ultimate cessation :
1. Meteorological drought is brought abou... | <urn:uuid:cda892e0-b644-483b-957f-dc106178546b> | 3.78125 | 573 | Knowledge Article | Science & Tech. | 42.600252 |
Shields up, Captain! There's an unidentified entity ahead! On second thoughts, no need to take evasive action -- this particular space blob is just the glowing remains of a sun-like star, 3,300 light-years away. ->
Alpha Centauri A has been seen to have a cool layer in its atmosphere, just above it's surface -- the fir... | <urn:uuid:2f73a1cb-48b4-422f-8539-801d42dc8cd5> | 2.71875 | 290 | Content Listing | Science & Tech. | 50.471891 |
The neutron at low momentum is quantum mechancal during the scattering, and the bouncing off is by wave mechanics, not by bouncing off. The neutron gets reflected into all directions by the small region with a potential, and the amount of scattering is given by the Born approximation to lowest order in the momentum of ... | <urn:uuid:65b5088b-0ded-47c5-b24f-f34ddf8a935f> | 2.71875 | 391 | Q&A Forum | Science & Tech. | 34.089706 |
The 1976 Viking 1 Lander seemed to find life on Mars. Scientists quickly dismissed the data, and seldom mentioned it in later years. But thirty six years later an article appeared that claimed Viking was right—and it was roundly ignored... for about six weeks. Then the story first appeared in Discovery News April 12, ... | <urn:uuid:8cb4d467-0cd6-4281-9552-8defa7be258a> | 2.953125 | 963 | Knowledge Article | Science & Tech. | 54.800465 |
The Living Forests Model, developed with the International Institute for Applied Systems Analysis, allows us to explore the implications of various land-use scenarios. We used the model to look at the potential impact of the large increase in bioenergy required by ambitious targets to reduce greenhouse gas emissions.
W... | <urn:uuid:37a54fe9-8635-417e-8fed-914747a20f8a> | 3.84375 | 377 | Knowledge Article | Science & Tech. | 21.883249 |
Geometry arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre-modern mathematics, the other being the study of numbers ....
, an interior angle
(or internal angle
) is an angle
In geometry, an angle is the figure formed by two rays sharing a common endpoint, call... | <urn:uuid:4397185f-cfff-4414-89ef-f5fa5809b301> | 3.78125 | 791 | Tutorial | Science & Tech. | 53.916784 |
Protonís Force Field - Fills the Atom, Attracting Electrons
In order for the atom1 to exist, the proton must capture and hold an electron in the atomís sphere which it does. For lack of technology or language I shall refer to the protonís hold as a positively charged force field.
Our positively charged proton, a + mono... | <urn:uuid:63a3455d-0b39-4117-853d-96992ef3c868> | 3.28125 | 657 | Academic Writing | Science & Tech. | 49.970674 |
Joined: Jan. 2006
|Hogwash. A class of devices called the Field Programmable Gate Array (FPGA) has been around for almost 25 years. I remember when my Intel Field Service Engineer was hyping Xilinx FPGA’s to me in the mid-1980’s. I presumed Intel had a financial stake in Xilinx. They were way too slow for anything I wa... | <urn:uuid:b2c335f9-3bb1-45ce-8a99-665b2eaaa03e> | 3.28125 | 791 | Comment Section | Science & Tech. | 51.104539 |
Twenty five years ago, the
brightest supernova of modern times
astronomers have watched and waited for
the expanding debris from this tremendous stellar
explosion to crash into
previously expelled material.
A clear result of such a collision is demonstrated in the above time lapse video of images
recorded by the Hubble... | <urn:uuid:d04a8c38-e0c7-4a2b-86fc-42735e94d09d> | 3.296875 | 152 | Truncated | Science & Tech. | 27.891379 |
Wisps like this are all that remain visible of a Milky Way star.
About 9,000 years ago that star exploded in a
supernova leaving the
Veil Nebula, also known as the Cygnus Loop.
At the time, the expanding cloud
was likely as bright as a crescent Moon, remaining
visible for weeks to people living at the dawn of
Today, th... | <urn:uuid:2bd382f3-cec4-48b9-bdd8-bbc5d87d021c> | 3.1875 | 191 | Knowledge Article | Science & Tech. | 37.762857 |
All > Science > Weather
- Energy that a body has as a result of its motion. Mathematically, it is defined as one-half the product of a body's mass and the square of its speed (KE = 1/2 * mass * velocity squared).
NOAA National Weather Service - Cite This Source - This Definition
- Couplet, Laminar flow, Rankine Vortex,... | <urn:uuid:d560b49a-4d62-4b2b-bac8-fba2d29e9880> | 3.28125 | 95 | Structured Data | Science & Tech. | 34.936568 |
Project Prairie Birds
A Citizen Science Project for Wintering Grassland Birds
|Gulf Coast Bird Observatory|
Texas Parks & Wildlife
TX Partners in Flight
Raven Environmental Services, Inc.
US Forest Service
|US Fish & Wildlife Service, Region 2|
Our southeastern grasslands are the primary destination for more than a doz... | <urn:uuid:58628593-00d9-4455-87ca-1a7468cd9bf9> | 3.28125 | 454 | Knowledge Article | Science & Tech. | 27.389375 |
Physics is the study of matter and its motion based on fundamental concepts such as force, energy, mass, and charge. Some topics include acoustics, aerodynamics, chemical physics, fluid mechanics, geophysics, optics, particle physics, plasma, quantum mechanics, and solid state physics.
Advanced Technologies & Aerospace... | <urn:uuid:fca468b0-24e6-4eb1-ac97-0ef830cf33af> | 2.75 | 226 | Content Listing | Science & Tech. | 20.355948 |
A summary of the distribution of mussels in the St. Croix based on quantitative sampling completed by the Macalester team can be found here.
A map of the St. Croix
access to more of the data on mussels in the river can be found by
There are 41 species of native mussels in the St. Croix River as well as two species of i... | <urn:uuid:7cb0c2ee-ff84-4961-9740-9f543e9c897c> | 3.5 | 346 | Knowledge Article | Science & Tech. | 51.443274 |
During experiments carried out in 1919 involving magnetism and acoustics, German scientist Heinrich Barkhausen provided convincing evidence that iron and other ferromagnetic materials are magnetized in small, distinct intervals rather than in a smooth, continuous manner, as had been theorized. Barkhausen did so by conn... | <urn:uuid:64b19d43-7285-4c86-bdab-bd7f57292e6e> | 4.1875 | 403 | Tutorial | Science & Tech. | 36.524882 |
Mar 10, 2013 — Not only is there no consensus yet on how life might have started on Earth, there is not even any agreement on where it started. But still, many think the mystery of life's origin can be solved. Commentator Wim Hordijk revels in the subject at a conference hosted by Princeton University.
Dec 17, 2012 — S... | <urn:uuid:2590a02e-ebac-44d1-aac8-fe7ef71bf491> | 2.75 | 124 | Content Listing | Science & Tech. | 58.532941 |
After decades of experimentation, scientists can finally grow diamonds that outshine even the rarest De Beers rocks. Launch the slideshow
By Elizabeth Svoboda
Posted 05.30.2006 at 2:00 am 4 Comments
What: Perfect single-crystal diamonds of more than two carats
(the average engagement ring is less than a carat) churned ... | <urn:uuid:c330e527-c45e-4ca9-9ac8-8f4a98bf9546> | 3.125 | 161 | Content Listing | Science & Tech. | 51.843361 |
In general, the term network can refer to any interconnected group or system.
Java Tutorial 3 – The For Statement and Operators
Java isn’t as redundant as perl, but there’s still almost always more than one way to write any given program. The following...
Java Tutorial 2 – Classes and Objects: A First Look
Classes are ... | <urn:uuid:4037fea1-43a9-43c2-bdec-a501aeaefdea> | 3.578125 | 864 | Content Listing | Software Dev. | 61.372728 |
Click on any phrase to play the video at that point.Close
Last year at TED I gave an introduction to the LHC. And I promised to come back and give you an update on how that machine worked. So this is it. And for those of you that weren't there, the LHC is the largest scientific experiment ever attempted -- 27 kilometer... | <urn:uuid:07a2aaf8-f4d7-48e5-987d-549eab23386e> | 3.03125 | 868 | Audio Transcript | Science & Tech. | 65.803556 |
Creating Accessible Data Tables
This article demonstrates how to code accessible data tables in (X)HTML, enabling visually impaired users who employ assistive technologies to interpret the table data. Two views of a tabular data table are presented and discussed.
- Source Markup - Vertical View: the table markup as wri... | <urn:uuid:22fa42cd-5c1d-44f0-b2a1-46f55f2f5fa7> | 3.734375 | 1,637 | Tutorial | Software Dev. | 52.956326 |
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Re: Mesozoic snow - refined
Let's review what I already said...
GCMs, continental interiors, freezing temperatures in winter, large seasonal
variation in temperatures, climate not equitable, ice rafted deposits throu... | <urn:uuid:fdc26938-eaa1-4577-bfbf-a6a3756d9d53> | 3 | 510 | Comment Section | Science & Tech. | 48.086142 |
A Comparative Mind: Crows can ‘reason’ about causes, a recent study finds
In an experiment, researchers found that crows were more likely to forage when they could attribute changes in their environment to a human presence.
This behaviour may suggest “complex cognition”, according to a study published in the Proceeding... | <urn:uuid:68af57d3-c8cc-4945-b571-325fa4836fc1> | 3.71875 | 257 | Personal Blog | Science & Tech. | 37.468737 |
In abstract algebra, a division ring, also called a skew field, is a ring in which division is possible. Specifically, it is a non-trivial unital ring in which every non-zero element a has a multiplicative inverse, i.e., an element x with a·x = x·a = 1. Stated differently, a ring is a division ring if and only if the g... | <urn:uuid:d290d9d2-b5e5-4d84-824c-97619c475b62> | 4.15625 | 899 | Knowledge Article | Science & Tech. | 43.298473 |
Solving the Carbon Conundrum
Progress Made on State-of-the-Art Carbon–Measuring Instrument
Scientists know the global levels of carbon dioxide in the atmosphere. They know how much is produced through natural processes and the burning of fossil fuels. But the numbers don’t jibe; the budget doesn’t balance. More carbon ... | <urn:uuid:0b3ac681-6274-471d-990a-b1a5509f52a8> | 3.625 | 1,269 | Knowledge Article | Science & Tech. | 33.267641 |
Date: Nov 29, 2012 1:31 AM
Author: Peter Duveen
Subject: Re: Some important demonstrations on negative numbers
To demonstrate that 1/-a = -(1/a):
(1/-a) x -a = 1 definition of 1/-a eq.1
- - (1/a) x a = -1 definition of 1/a
- -1 (1/a) x a = -1
(1/a) x -1 x a = -1
(1/a) x -a = -1
- -(1/a) x -a = 1 eq.2
>From eq. 1 and eq... | <urn:uuid:00554b0f-8997-4f33-847c-c7330a2edc27> | 3.1875 | 238 | Comment Section | Science & Tech. | 80.427539 |
A water management project requires a "wet coil" (coil will be submerged in aqueous media) designed to generate a steady-state electromagnetic field of adjustable magnetic magnetic flux density at the center. The coil will be helical with a hollow core (wound on a nylon perforated cylinder used as former). The inner di... | <urn:uuid:bc283406-6795-42b5-beb7-2c4dd10bc32d> | 2.71875 | 246 | Q&A Forum | Science & Tech. | 44.064573 |
Algae cause a stir in the local environment
Oct 18, 2010
The swishing actions of tiny swimming organisms play a key role in distributing heat and nutrients throughout the world's oceans and lakes, but these mixing effects are more complicated than we first thought. That is according to two separate research groups, bas... | <urn:uuid:05e10e6f-093f-4ede-9529-aad1593eb5f2> | 3.578125 | 832 | Truncated | Science & Tech. | 29.244925 |
Science Fair Project Encyclopedia
The Flehmen response is a particular type of curling of the lips in ungulates, felids, and many other mammals, which facilitates the transfer of chemicals into the vomeronasal organ. This behavior allows animals to smell the urine of others in order to determine several factors. These ... | <urn:uuid:6604aa29-8df7-4b95-9dce-20983f52612f> | 3.671875 | 144 | Knowledge Article | Science & Tech. | 31.516154 |
Trawls were rugged metal nets used at a variety of depths to collect
larger animals. The Challenger crew found it easier to use trawls,
rather than the heavier and more awkward dredges, when collecting
life from the bottom.
Nets of different size and mesh were the primary tool
aboard Challenger for collecting living sa... | <urn:uuid:ded62028-91a2-49b3-ae1c-a29be6853517> | 3.4375 | 105 | Knowledge Article | Science & Tech. | 52.592361 |
Chemical reactions (stoichiometry)
Stoichiometry Introduction to stoichiometry
⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles.
- We know what a chemical equation is and we've learned
- how to balance ... | <urn:uuid:307dd8b3-1c10-45af-a193-2178ac70bd60> | 4 | 2,293 | Truncated | Science & Tech. | 73.243284 |
We have used biomass energy or bioenergy - the energy from organic matter - for thousands of years, ever since people started burning wood to cook food or to keep warm.
And today, wood is still our largest biomass energy resource. But many other sources of biomass can now be used, including plants, residues from agricu... | <urn:uuid:5ea4ae69-730b-4c64-bc2a-5ea12489003c> | 3.75 | 249 | Knowledge Article | Science & Tech. | 34.065294 |
This is an exciting episode! It is one that takes a positive look at the possible future of energy creation. Our blogger was a lot of help on this one in explaining some of the interesting facts behind the science of this episodes topic. Hopefully the E-CAT will not be under the topic of unexplained science for long. E... | <urn:uuid:8ad5ad85-ce88-4cf5-9f0a-c2bf5535446d> | 2.90625 | 1,251 | Personal Blog | Science & Tech. | 53.753349 |
CAMBRIDGE, England, Jan. 21 (UPI) -- DNA, normally structured as a double helix, has been seen in a "quadruple helix" form in human cells and could be related to cancer, British researchers say.
The double helix has been considered the normal form of DNA for 60 years, since researchers James Watson and Francis Crick de... | <urn:uuid:881285f1-4775-4bda-b613-b6484194a1ab> | 3.15625 | 432 | Content Listing | Science & Tech. | 40.582343 |
Flags, counters, and literal value persistent variables can be used inside prelude expressions like any other variable. If the persistent variable does not exist before it is used, the default value is 0. For example, the following declaration would add 3 to the value stored in the entity counter
ent:fizz, storing the ... | <urn:uuid:05c67ec4-9cb5-41a2-a243-2e1602ed6da5> | 3.09375 | 192 | Documentation | Software Dev. | 50.898147 |
Epoch B1950.0 Equinox B1950.0
|Right ascension||19h 13m 12.4655s|
|Declination||16° 01′ 08.189″|
PSR B1913+16 (also known as PSR J1915+1606 and PSR 1913+16) is a pulsar (a radiating neutron star) which together with another neutron star is in orbit around a common center of mass, thus forming a binary star system. In 1... | <urn:uuid:cf7362fc-ed82-4c1e-b2d3-03daca95e34a> | 2.90625 | 1,561 | Knowledge Article | Science & Tech. | 69.26527 |
Perhaps one of the hardest problems in knot theory is determining whether two knots are isotopic. One method of solving this problem is the polynomial invariant.
The ideal polynomial invariant would yield a unique polynomial for each isotopic class that is consistant through each projection of the class. Most of the po... | <urn:uuid:53a53bbf-4e0f-4515-a6b3-b1c76b0fd00b> | 3.25 | 765 | Knowledge Article | Science & Tech. | 20.608631 |
> An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant.57) If a null pointer constant is converted to a pointer type, the resulting pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function.
So, my gue... | <urn:uuid:bc4557d9-165c-42bc-a314-c7c2bdd84999> | 2.78125 | 166 | Comment Section | Software Dev. | 69.41 |
If = 3 - 4 + 6, and · = 4, find tanθ where θ is the angle between and . Give an exact answer.
not sure what to do here, i know that i can divide sin by cos to get tan but i get a vector... help please
Evaluating the dot and cross product is probably the best way to work out angles between vectors because you don't have... | <urn:uuid:73382428-bcd1-4544-99ee-90db35a598ba> | 3.046875 | 187 | Q&A Forum | Science & Tech. | 71.870206 |
Monday, June 14, 2010
Air Pressure: Straw Fountain
Fill a cup part way with water.
Hold a straw vertically in the water – make sure it’s not touching the bottom of the cup. (You could probably tape the straw to the cup if you’re having a hard time holding on to all of the parts.)
Using another piece of straw, blow acro... | <urn:uuid:019e8317-ee08-4fc6-bc39-9c955559d2cb> | 3.25 | 260 | Tutorial | Science & Tech. | 75.153287 |
Frost (also called Hoarfrost and White Frost), ice crystals produced by the freezing of water vapor on the ground, on objects near the ground, or on windows. Water vapor in the air condenses into a liquid or a solid at a temperature called the dew point. This temperature varies, depending on the amount of vapor in the ... | <urn:uuid:ad2f0b62-6b12-4d4d-bbc3-f245cdf342b1> | 3.90625 | 249 | Knowledge Article | Science & Tech. | 65.708812 |
Places like Antarctica have lots of ice, but people can also find it in home appliances (machines in the home) like the refrigerator or freezer. If people put water in a freezer and leave it for a while, the water gets very cold and will freeze solid, creating ice. People can put water into a copper (or metal) containe... | <urn:uuid:f68988d1-c68a-4715-b6e0-92e5f3967f88> | 3.9375 | 807 | Knowledge Article | Science & Tech. | 49.543947 |
Statistics and Probability Dictionary
Select a term from the dropdown text box. The online statistics
glossary will display a definition, plus links to other
related web pages.
The absolute value of a
number is its distance from zero on the number line. For example, -7 is 7
units away from zero, so its absolute value w... | <urn:uuid:a8fc6aa1-eed9-4fa1-b985-771d7c1c886f> | 3.890625 | 155 | Structured Data | Science & Tech. | 58.603224 |
Two Tucson solar scientists with the National Solar Observatory at Kitt Peak have been keeping track of sunspots. The steady decline in sunspots may foreshadow a period of strong global cooling. The last time sunspots behaved this way was from 1645 to 1715, a time known as the Maunder Minimum, and also “the little ice ... | <urn:uuid:264d74fc-62c2-44c0-aac1-26ab9d8e726d> | 3.5625 | 730 | Personal Blog | Science & Tech. | 44.602692 |
Science Fair Project Encyclopedia
A Brownian tree, whose name is derived from Robert Brown via Brownian motion, is a form of computer art that was briefly popular in the 1990s, when home computers started to have sufficient power to simulate Brownian motion. Brownian trees are mathematical models of dendritic structure... | <urn:uuid:45f10abf-be23-4dbd-94d2-fe77e97dc637> | 3.90625 | 323 | Knowledge Article | Science & Tech. | 39.951301 |
Matter (or mass) is the physical stuff of the universe, while energy is what causes matter to move and change. There are different forms of matter (for example, solid, liquid and gas) as well as different forms of energy (such as electrical, chemical and nuclear energy). For centuries, scientists thought that matter co... | <urn:uuid:fc03fa63-ed9d-4acf-a640-4d4010228e7f> | 3.515625 | 235 | Knowledge Article | Science & Tech. | 41.492454 |
By Dr. Mikko Syrjäsuo, Alberta Ingenuity Fellow, University of Calgary
It all begins with our nearest star, the Sun, whose surface is so hot that it gives off a continuous stream of solar wind. The wind from the Sun carries particles with it to the rest of the solar system and beyond. This not-so-gentle breeze is conti... | <urn:uuid:c01d9af0-6f54-40d2-a8a4-b297f9333782> | 4.03125 | 778 | Knowledge Article | Science & Tech. | 47.115586 |
Full Lab Manual
Introduction & Goals
Chemistry & Background
In Your Write-up
1. A 20.0 mL sample of 0.050 M [Co(NH3)5(H2O)]3+ is titrated with 0.025 M NaOH. Calculate the concentrations of [Co(NH3)5(H2O)]3+, [Co(NH3)5(OH)]2+, H3O+, and OH- before titration begins. What volume of NaOH will be required to reach the endpo... | <urn:uuid:02602ebd-aa32-46df-ae9f-28df2d5f80b3> | 2.890625 | 329 | Tutorial | Science & Tech. | 100.471791 |
The Venus Transit 2004
... Educational Sheet 4
How to estimate the Earth-Sun Distance by means of trigonometry and a model of the Phases of Venus
Lars Petersen, Alan C. Pickwick, Rosa M. Ros, Mogens Winther (EAAE)
Level: Some mathematical ability is required.
- To use the transit of Venus to determinate the distance to... | <urn:uuid:7f7c2c2d-7715-4787-b777-56ca5feff159> | 3.71875 | 4,129 | Tutorial | Science & Tech. | 70.871136 |
Modeling Flood Control Waterways
McKee Applegate River Bridge in Oregon
Model area as meshed
FLOW-3D results, water
is colored by velocity
The installation of a new bridge over the Applegate River in Oregon presented some very challenging modeling circumstances for ASCG Inc., a FLOW-3D customer in Colorado. With three ... | <urn:uuid:27ce594e-4460-49bd-8f39-94a5e2735c6c> | 2.953125 | 310 | Knowledge Article | Science & Tech. | 33.72 |
[Haskell-cafe] Practical introduction to monads
stefan at cs.uu.nl
Wed Aug 3 05:06:35 EDT 2005
> I have also one time read an example where you use monads while
> implementing the unification or type inference algorithm, perhaps in
> the original
> monad paper (the essence of functional programming).
I guess you are re... | <urn:uuid:c64bde7d-f8c3-4ef0-af25-e9da279ebda1> | 2.78125 | 202 | Comment Section | Software Dev. | 37.295717 |
Try This at Home: Sight or Scent
The prefix "nano" means one billionth. At such a small scale, some tools are more reliable and useful than others.
What You Need
- 100 mL (~1/2 cup) water
- Graduated cylinder or measuring spoons
- 1 mL (1/4 teaspoon) colored mouthwash (or colored water with a drop of vanilla or perfume... | <urn:uuid:e1b5bc4d-4904-418b-80f4-ff15c358674c> | 3.28125 | 720 | Tutorial | Science & Tech. | 73.27347 |
Joined: 03 Oct 2005
|Posted: Tue Dec 20, 2005 10:18 am Post subject: Semiconductor Nanocrystals: Alternative to Toxic Compounds?
|Scientists at the University of Arkansas Develop Semiconductor Nanocrystals as an Alternative to Toxic Compounds
University of Arkansas researchers have used a technique known as "doping" to... | <urn:uuid:dc282b5d-ce94-4ede-95d1-a04c3e0f6f69> | 2.828125 | 688 | Comment Section | Science & Tech. | 28.577276 |
Willy Wonka could have powered his Great Glass Elevator on hydrogen produced from his chocolate factory.
Microbiologist Lynne Mackaskie and her colleagues at the University of Birmingham in the UK have powered a fuel cell by feeding sugar-loving bacteria chocolate-factory waste. "We wanted to see if we tipped chocolate... | <urn:uuid:4a9ebacd-0a09-4247-9f4f-6bddd73a76b9> | 3.046875 | 223 | Truncated | Science & Tech. | 39.924681 |
|Jan16-12, 05:49 PM||#1|
Galactic frame dragging
Do galaxies produce measurable/significant frame dragging effects by their rotation?
I would think frame dragging depends on the mass and speed of rotation... Are such effects only felt at the boundary between rotating gravitational fields and flatter space, i.e. the edg... | <urn:uuid:aff0fcf0-842f-49da-922d-eeac3307a288> | 2.8125 | 409 | Comment Section | Science & Tech. | 48.170801 |
The Washington Post picked up on the latest update to the 2005 temperature anomaly analysis from NASA GISS. The 2005 Jan-Sep land data (which is adjusted for urban biases) is higher than the previously warmest year (0.76°C compared to the 1998 anomaly of 0.75°C for the same months, and a 0.71°C anomaly for the whole ye... | <urn:uuid:cc526e29-b61c-4526-9d1b-1f483a5299c5> | 2.6875 | 469 | Personal Blog | Science & Tech. | 70.505225 |
Our galaxy is still reverberating from a strike by a small galaxy or massive dark matter structure.
A large asteroid that initially had scientists worried has only a small chance of striking the Earth in 2040, says NASA.
Scientists say they've found more evidence of a major impact by a comet or asteroid, some 13,000 ye... | <urn:uuid:ce764f25-f953-4e06-b9bb-cf0223b43466> | 3.5 | 126 | Content Listing | Science & Tech. | 47.699359 |
This image shows the Sun's polarity
measured by Ulysses
VHM/FGM Instrument Page
Ulysses has a unique orbit
. By going past Jupiter
, Ulysses was able to go into an inclined orbit that has never been achieved before (this is the sling shot approach
to getting a spacecraft into orbit). From this new type of orbit, Ulysse... | <urn:uuid:2e8b24e0-46a9-4c95-b052-f7ecfc1d7eef> | 3.65625 | 590 | Content Listing | Science & Tech. | 57.042454 |
The Cosmic Microwave Background (CMB) is radiation we receive today from a time when the universe was about 300,000 years young. At that time, radiation decoupled from matter and since then, photons could travel almost undisturbed. The CMB shows the temperature, or the inverse wavelength, of the microwaves that we rece... | <urn:uuid:3521b6b3-f1c1-4cc6-906f-e82485d11609> | 3.921875 | 942 | Personal Blog | Science & Tech. | 47.575408 |
The Human Brain Project plans to build a high fidelity virtual model of a workinghuman brain, modeling aspects of the brain including neuron connections, blood flow,and even the behavior of individual neurons, down to the level of ion channels. Theproject will be lead be Henry Markram, a scientist at the Swiss Federal ... | <urn:uuid:da8f36b6-b8af-42b7-a5b2-0ba6d6a8211e> | 2.890625 | 290 | Comment Section | Science & Tech. | 42.689001 |
RECORD: Swale, W. 1858. Hive-Bees in New Zealand [a letter to Darwin]. Gardeners' Chronicle and Agricultural Gazette (13 November): 829.
REVISION HISTORY: Scanned by John van Wyhe, transcribed (single key) by AEL Data 10.2008. RN1
Hive-Bees in New Zealand.—The hive bee was introduced into Wellington in 1842 and into Ca... | <urn:uuid:8fabfee2-187a-4d18-acc0-061dfef2b416> | 2.984375 | 388 | Truncated | Science & Tech. | 70.508425 |
In computing, Pic is a domain-specific programming language by Brian Kernighan for specifying diagrams in terms of objects such as boxes with arrows between them. The pic compiler translates this description into concrete drawing commands. Pic is a procedural programming language, with variable assignment, macros, cond... | <urn:uuid:d092a264-4536-45f5-a3fa-385b798ecd93> | 3.484375 | 464 | Knowledge Article | Software Dev. | 51.217444 |