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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(Click to enlarge)
This image is of the solar eclipse earlier this week. Solar eclipses occur when the moon comes between the Earth and Sun. However, there's more to it than just that, otherwise we'd have a solar eclipse every ~28 days (one full lunar cycle).
When viewed edge on, the plane in which the moon orbits is s... | <urn:uuid:c439f314-1664-4d1c-830e-b989fad44188> | 4.09375 | 1,262 | Personal Blog | Science & Tech. | 56.817564 |
Macroscopic Properties and Microscopic Models
As a simple example of how the macroscopic properties of a substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. can be explained on a microscopic level, consider the liquidA state of matter in which the atomic-scale pa... | <urn:uuid:788a26bb-3431-4e86-88e7-32adca8979c4> | 3.953125 | 1,156 | Academic Writing | Science & Tech. | 44.467513 |
The power operator binds more tightly than unary operators on its left; it binds less tightly than unary operators on its right. The syntax is:
Thus, in an unparenthesized sequence of power and unary operators, the operators are evaluated from right to left (this does not constrain the evaluation order for the operands... | <urn:uuid:832d6b1e-1229-44fa-9a1a-ad1e31b0a7a4> | 3.5625 | 291 | Documentation | Software Dev. | 47.856354 |
TRectangle = class(TShape)
class PASCALIMPLEMENTATION TRectangle : public TShape
TRectangle defines 2D rectangles with customized corners. It inherits TControl and can be used in styles to construct controls.
The rectangle size and position are defined by the following properties of the TRectangle object:
- The shape r... | <urn:uuid:415715e7-dda0-40f9-b473-16254eb3f60a> | 2.703125 | 300 | Documentation | Software Dev. | 23.4825 |
A Geometric Proof
See Also: Problem Solving with Heron's Formula
1. The incircle and its properties.
2. An excircle and its properties.
3. The area of the triangles is rs, where r is the inradius and s the semiperimeter.
4. The points of tangency of a circle inscribed in an angle are equidistant from the vertex.
Return... | <urn:uuid:cd57d55d-6149-46a7-8969-8de8714ca8d7> | 3.3125 | 97 | Tutorial | Science & Tech. | 74.45875 |
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.
- Divergent Infinite Series [05/30/2003]
I bought a book _Praise for The Mathematical Universe_, by Wi... | <urn:uuid:a6f8a7d9-961d-42ff-b61f-f7f8028823b4> | 2.890625 | 2,270 | Q&A Forum | Science & Tech. | 95.26681 |
A 136-m-wide river flows due east at a uniform speed of 9 m/s. A boat with a speed of 1 m/s relative to the water leaves the south bank pointed in a direction 16° west of north. How long does the boat take to cross the river? Assume an xy coordinate system with the positive direction of the x axis due east and the posi... | <urn:uuid:24efdb04-aa9f-4dee-b76e-2828b63bf5bb> | 2.71875 | 92 | Q&A Forum | Science & Tech. | 80.496734 |
A triangle is inscribed in a circle. The vertices of the triangle divide the circle into three arcs of lengths 3,4,and 5. What is the area of the triangle?
Not sure how to start the problem...
Could I get some hints please?
You must draw a diagram. Inscribe a triangle in a circle.
Draw three radial segments, one from e... | <urn:uuid:f65c1bb5-3661-40a5-8ba0-a035c529ac8d> | 3.484375 | 340 | Q&A Forum | Science & Tech. | 104.82709 |
A quadrilateral changes shape with the edge lengths constant. Show
the scalar product of the diagonals is constant. If the diagonals
are perpendicular in one position are they always perpendicular?
NRICH has always had good solutions from Madras College in St
Andrew's, Scotland but the solutions to this problem were tr... | <urn:uuid:8d5b2533-1a34-440b-9f92-e0d7f7a65a30> | 2.859375 | 114 | Academic Writing | Science & Tech. | 48.845098 |
Greenland Ice Sheet Melt Characteristics Derived from Passive Microwave Data
The Greenland ice sheet melt extent data, acquired as part of the NASA Program for Arctic Regional Climate Assessment (PARCA), is a daily (or every other day, prior to August 1987) estimate of the spatial extent of wet snow on the Greenland ic... | <urn:uuid:471a4be3-b5de-422c-bae0-c0d1f976e2cb> | 3.328125 | 370 | Knowledge Article | Science & Tech. | 34.724422 |
The gem command is one of the most used Ruby-related commands, but most users don't take the time to learn anything past gem install and gem search. Learning the gem command well is an essential Ruby skill.
The gem command-line utility is split into a number of commands. Among these are the familiar install and search,... | <urn:uuid:b6d89e79-cbf4-48cc-9c11-f4650381ab55> | 2.703125 | 1,330 | Tutorial | Software Dev. | 55.000636 |
Pressure and Buoyancy Problems
Let's state the two working equations we have so far.
| Pressure and Depth: || P = Po + rgh |
|Buoyancy:|| Fbuoyancy = Weight displaced = rgVdisplaced |
The solutions to the problems below can be found at the end of this page. As always, try all the problems before looking at the solution... | <urn:uuid:d48331c1-3e49-40c6-8b4d-fd710bfe9652> | 3.25 | 1,366 | Tutorial | Science & Tech. | 91.524973 |
Science Fair Project Encyclopedia
The trade winds are a pattern of wind found in bands around the Earth's equatorial region. The trade winds are the prevailing winds in the tropics, blowing from the high-pressure area in the horse latitudes towards the low-pressure area around the equator. The trade winds blow predomin... | <urn:uuid:5bcdf32a-0830-494a-8ded-f3d80434eb16> | 3.90625 | 543 | Knowledge Article | Science & Tech. | 52.77384 |
Little was known about this hydrogen-breathing organism before its genome sequence was determined. By utilizing computational analyses and comparison with the genomes of other organisms, the researchers have discovered several remarkable features. For example, the genome encodes a full suite of genes for making spores,... | <urn:uuid:f98faee8-b113-4114-800d-2befb0883078> | 4.1875 | 327 | Knowledge Article | Science & Tech. | 26.775693 |
Classification & Distribution
- incomplete development (egg, nymph, adult)
- closely related to Thysanoptera and Psocoptera
Distribution: Abundant worldwide. Found in most terrestrial and freshwater habitats.North America
Worldwide Number of Families4073 Number of Species3587>50,000
Life History & Ecology
Members of th... | <urn:uuid:6abddc74-7f17-4ddf-839f-d451d3f0d228> | 3.96875 | 1,149 | Knowledge Article | Science & Tech. | 28.587396 |
Moons are shaped by the same surface processes that
shape the planets. Several of the moons of the outer
planets are large enough to be thought of as planets
themselves. In fact, Jupiter's largest moon, Ganymede,
is larger than the planet Mercury.
Moon: NASA/USGS; Ganymede:
Io: NASA/JPL/University of Arizona; Triton:
!... | <urn:uuid:a92c7f4e-88c9-43da-97de-f1a6f8483f51> | 3.796875 | 172 | Tutorial | Science & Tech. | 56.172273 |
A group of rows and columns. The x-axis is the horizontal row, and the y-axis is the vertical column. An x-y matrix is the reference framework for two-dimensional structures, such as mathematical tables, display screens, digitizer tablets, dot matrix printers and 2D graphics images.
Search For x-y matrix On ChannelWeb
... | <urn:uuid:0f375849-2c68-4d90-9bab-6a69151aed48> | 2.96875 | 96 | Structured Data | Science & Tech. | 54.298041 |
Sizing up Earthquake Damage: Differing Points of View
When a catastrophic event strikes an urban area, many different professionals hit the ground running. Emergency responders respond, reporters report, and scientists and engineers collect and analyze data. Journalists and scientists may share interest in these events... | <urn:uuid:a9c1c6e1-1061-4a80-b4d8-cd1f516c04f6> | 3.453125 | 1,471 | Knowledge Article | Science & Tech. | 31.868729 |
Greater DOF with secondary electron imaging is largely a matter of working distance--defined as the distance (in mm) from the objective lens to the top of the sample being imaged. Of course, the lenses in this type of instrument are electromagnetic (not glass) lenses, and can effect different crossover (focus) points b... | <urn:uuid:8197b1fa-fc76-4562-b21d-a175d8d77214> | 2.703125 | 693 | Comment Section | Science & Tech. | 57.02492 |
Obviously, birds sing. But mice?
[Mice song sound.] That’s a mouse song.
Researchers have known about these high-pitched squeaky songs for years. But they only recently discovered that mice can learn the songs of other mice. Such vocal learning is a rarity among animals. We know of only three kinds of birds—parrots, hu... | <urn:uuid:04438b5d-ad98-462e-8d8d-6e6984464144> | 3.21875 | 283 | Audio Transcript | Science & Tech. | 56.519622 |
Fossil range: Early Paleocene - Recent
| Ammospermophilus leucurus|
Forty percent of mammal species are rodents, and they are found in vast numbers on all continents other than Antarctica. Common rodents include mice, rats, squirrels, chipmunks, gophers, porcupines, beavers, hamsters, gerbils, guinea pigs, chinchillas ... | <urn:uuid:076634c7-bef0-4102-9d72-986c3aced601> | 3.5625 | 3,997 | Knowledge Article | Science & Tech. | 43.927548 |
How a nuclear reactor makes electricity
A nuclear reactor produces and controls the release of energy
from splitting the atoms of uranium.
Uranium-fuelled nuclear power is a clean and efficient way of
boiling water to make steam which drives turbine generators. Except
for the reactor itself, a nuclear power station wor... | <urn:uuid:c259cc03-df21-435b-b4d6-fb7b27710b2b> | 4.125 | 738 | Knowledge Article | Science & Tech. | 35.885882 |
Whether they’re toys that shine in the night, black lights, glow sticks or fireflies, things that produce an eerie glow are fascinating. Give a kid a glow-in-the-dark toy or paper her ceiling in dimly shining plastic stars, and she will be occupied forever. She’ll find ever brighter lights to charge them up, ever darke... | <urn:uuid:c05ab62e-2728-42c0-bfc6-01e5f75eafc8> | 3.53125 | 1,083 | Personal Blog | Science & Tech. | 49.596934 |
Some 3.5 billion years ago, a single-celled organism now named LUCA (for the Last Universal Common Ancestor of all life on Earth) developed the ability to pull oxygen out of its environment. Although LUCA is long gone, University of Hawaii microbiologist Maqsudul Alam has taken a step toward understanding the secret be... | <urn:uuid:6f68e90c-6447-4914-90b4-113218e933d7> | 3.9375 | 432 | Knowledge Article | Science & Tech. | 31.719075 |
VLTI observations of the radii of four small stars
The radii and masses of the four very-low-mass stars now observed with the VLTI, GJ 205, GJ 887, GJ 191 (also known as "Kapteyn''s star") and Proxima Centauri (red filled circles; with error bars). For comparison, planet Jupiter's mass and radius are also plotted (blue... | <urn:uuid:0fe245f7-49df-4a89-861a-e329222c30b8> | 2.890625 | 180 | Truncated | Science & Tech. | 52.377531 |
Pascal’s Triangle is a special triangular arrangement of numbers used in many areas of mathematics. It is named after the famous 17th century French mathematician Blaise Pascal because he developed so many of the triangle’s properties. However, this triangular arrangement of numbers was known by the Arabian poet and ma... | <urn:uuid:7a83b8ab-ac7e-4b18-be31-d445000cca1b> | 3.890625 | 737 | Knowledge Article | Science & Tech. | 80.608913 |
May 26, 2010, 6:13 AM
Post #4 of 6
Please use the code tags whenever you post code.
Start by adding these 2 lines, which should be in every Perl script you write.
Those pragmas will point out lots of coding errors that can be difficult to track down.
The strict pragma forces you to declare your vars, which is done with... | <urn:uuid:0fb65209-141f-4086-870c-fe2d50bd57cc> | 2.859375 | 254 | Comment Section | Software Dev. | 73.336645 |
On Friday, we posed the following back-to-school-themed Fermi problem:
Assuming you're not in a big lecture hall and the professor shuts the door at the start of class, how long does it take for you and your classmates to deplete the oxygen enough to feel it?
We promised a surprising answer, and here it is. You decide ... | <urn:uuid:a68ffb3c-3c83-4b98-ad7b-1282010fb275> | 3.03125 | 594 | Personal Blog | Science & Tech. | 80.662083 |
- Does global change increase the success of biological invaders?
Trends in Ecology & Evolution, Volume 14, Issue 4, 1 April 1999, Pages 135-139
Jeffrey S. Dukes and Harold A. Mooney
AbstractBiological invasions are gaining attention as a major threat to biodiversity and an important element of global change. Recent re... | <urn:uuid:9978e2e6-d907-421a-abd0-ef43088fb2b5> | 2.6875 | 706 | Content Listing | Science & Tech. | 26.135653 |
Radio-Collaring Elephants in Namibia
with Keith Leggett
Keith Leggett radio-collars enormous elephants in the Namibian desert to find out where they range and roam-and gets help from a BBC film crew.
Attaching a radio-collar to a 5-ton animal is no easy task. Especially if that animal, say, an elephant, has no interest... | <urn:uuid:015f4b05-56f2-4463-8bdd-8e038a204a0f> | 3 | 1,253 | Nonfiction Writing | Science & Tech. | 57.921608 |
In this lesson our instructor gives an introduction to conditional loops. First, he discusses while loop, looping over arrays, and array traversal functions. Then he talks bout looping over indexed and associative arrays. He also lectures on looping over arrays using list() and each(), control structure scope and codin... | <urn:uuid:ed63306a-0c96-488e-bfb0-b477bcdd3fa5> | 3.90625 | 401 | Truncated | Software Dev. | 39.844538 |
Department of Environment and Conservation (NSW), 2005
ISBN: 1 7412 2144 7
7 Previous Recovery Actions
- 7.1 Survey
- 7.2 Profile and environmental impact assessment guidelines
- 7.3 Establishment of a recovery team
- 7.4 Community awareness initiatives
- 7.5 In-situ protection
During the preparation of this recovery p... | <urn:uuid:a1045ccb-eb51-4cc4-a94d-dc699accc8f1> | 2.828125 | 685 | Knowledge Article | Science & Tech. | 36.642847 |
The Night Skies of August: A Convergence of Planets and a Shower of Meteors
by Leo Enright
In the month of August, with longer nights than in July, we have more time to enjoy the view of the great Summer Milky Way, as well as the famous meteor shower of mid-August. This year we have the added bonus of the two brightest... | <urn:uuid:5a639053-f70d-416f-9182-d7aa0abd8c7a> | 2.96875 | 1,557 | Nonfiction Writing | Science & Tech. | 58.832917 |
Mars One is a private sector endeavor to send human beings to Mars. The estimated cost of $6 billion will be raised by selling T-shirts and hosting reality shows. In theory, the mission will launch in 2023. In order to reduce costs, astronauts will not be returned to earth. In other words, this is a one-way trip
There ... | <urn:uuid:5c9c5c12-81c2-4711-90d3-ecf7d346c8fa> | 3.21875 | 427 | Personal Blog | Science & Tech. | 45.291458 |
Life Science: Session 3
Sex Cell Production
What are sex cells?
Sex cells, or gametes, are unique to organisms that reproduce sexually. In animals and plants (fungi are somewhat different in this regard) there are two types of sex cells: male and female. The male sex cells are sperm, while the female sex cells are eggs... | <urn:uuid:f9e1e7fe-748a-47bc-8b98-c404e8206a3d> | 4.21875 | 934 | Knowledge Article | Science & Tech. | 38.077658 |
Dictyostelium discoideum is a soil-living amoeba. A group of 100,000 form a mound as big as a grain of sand.
The hereditary information is carried on six chromosomes with sizes ranging from 4 to 7 Mb resulting in a total of about 34 Mb of DNA, a multicopy 90 kb extrachromosomal element that harbors the rRNA genes, and ... | <urn:uuid:55a0410f-0c0d-49f9-b756-4eb138946ccf> | 3.421875 | 146 | Knowledge Article | Science & Tech. | 47.450708 |
This is an image of an unidentified environmental microbial community collected from a shallow subsurface sediment sample. The sample was taken from the Gulf of Mexico at a depth of 575 meters and photographed using a DNA DAPI fluorescent stain. The stain fluoresces blue to count the cells found in the sediment sample.... | <urn:uuid:322de67f-93aa-4dfe-a64b-20f475fa6ef8> | 3.734375 | 749 | Content Listing | Science & Tech. | 30.758945 |
ICON Web & News
Search Using OECD Database
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Addition or Correction
In Situ Synchrotron X-ray Fluorescence Mapping and Speciation of CeO2 and ZnO Nanoparticles in Soil Cultivated Soybean (Glycine max)
Link to Journal Abstract
With the increased use of engineered nanomaterials such as ZnO and CeO2 ... | <urn:uuid:f6844639-952e-49f8-b074-2d30e7c2e568> | 2.703125 | 702 | Academic Writing | Science & Tech. | 43.647634 |
At its distant orbit, Webb is much too far from Earth to be reached by the space shuttle. Webb's science mission length is 5 years with a 10 year goal. To insure the 5 year mission, NASA has engineered the observatory so that all critical subsystems have a backup or will degrade gracefully with age. For instance, the N... | <urn:uuid:ea34cb02-989e-434c-8368-a17e06db2b00> | 3.421875 | 166 | Knowledge Article | Science & Tech. | 48.372647 |
The answer appears to be yes, that we can construct such numbers at present. The techniques that have been used recently have their roots around 1985 when elliptic curves were first applied to cryptography and factorization and when personal computers with RAM by the megabyte became common.
I would like to thank Charle... | <urn:uuid:0e092c1a-3b18-4556-b79e-25340009ab5d> | 2.703125 | 461 | Q&A Forum | Science & Tech. | 35.372676 |
Major Section: HISTORY
Example: :pe fn ; sketches the command that introduced fn and ; prints in full the event within it that created fn.See logical-name.
Pe takes one argument, a logical name, and prints in full the event
corresponding to the name.
Pe also sketches the command responsible
for that event if the comman... | <urn:uuid:fc6923c6-3f17-4acb-84f4-38c1724a11bc> | 3.328125 | 323 | Documentation | Software Dev. | 71.420293 |
This phenomena has been explained by the Zetas and is thoroughly documented on this blog.
While the "official" cause of such massive fish kills is often attributed to hypoxia (lack of oxygen), what is conveniently excluded in these opaque explanations is that high concentrations of dissolved methane essentially expels ... | <urn:uuid:6b7427b8-34a2-4e75-b0da-eca0f34b3001> | 2.921875 | 1,809 | Personal Blog | Science & Tech. | 73.702063 |
When we last checked in to the Nansen Sea Ice Graphs, it looked like they were heading towards the “normal” line in a hurry. Ice area seems to still be on that trend, while extent seems to be leveling off it’s growth rate. Area appears to be within about 200,000 square kilometers of the 1979-2007 monthly average and st... | <urn:uuid:c47cbe87-f48d-48de-a45a-14b4061cd61b> | 3.421875 | 659 | Knowledge Article | Science & Tech. | 60.164292 |
The Acoustic Search
In the field
ARU mounted on a tree (left) with its battery (right). Photo by Chris Tessaglia-Hymes
To search for acoustic evidence for Ivory-billed Woodpeckers in Arkansas and other states within the historical range, we record ambient sounds using autonomous recording units (ARUs). ARUs are program... | <urn:uuid:77b0bbf8-c845-462a-bae9-2a7692b39098> | 3.21875 | 1,193 | Knowledge Article | Science & Tech. | 34.158975 |
How the universe is erasing evidence of its beginnings and moving faster toward its end
In 1917, on the third floor of an apartment building in the Wilmersdorf borough of wartime Berlin, an ailing tenant named Albert Einstein sat focused on a lofty subject: the universe. In February of that year, he published a paper t... | <urn:uuid:71948182-97de-405f-ad9e-6111c2afa6e1> | 3.765625 | 2,494 | Knowledge Article | Science & Tech. | 43.823468 |
One method for verification of correctness is to compare algorithm implementations to STL sort for assurance of equivalent results, but that assumes STL sort is correct. To not rely on correctness of STL sort requires implementing a correctness test for sorting algorithms. Correctness requires that array[i] ≤ array[i+1... | <urn:uuid:65f4c07c-fb2f-4325-beb3-21abc9c0b1bb> | 3.171875 | 445 | Documentation | Software Dev. | 53.377581 |
For more information on the Concurrency Runtime Framework, see Concurrency Runtime: The Resource Manager.
Visual C++ 2010 comes with new features and enhancements to simplify more native programming. The Concurrency Runtime (CRT), for instance, is a framework that simplifies parallel programming and helps you write rob... | <urn:uuid:a8560120-dd89-457c-91b5-f91cc2a65d44> | 3.0625 | 914 | Documentation | Software Dev. | 20.351805 |
are gamma rays?
A gamma ray is a packet
of electromagnetic energy--a photon. Gamma photons are
the most energetic photons in the electromagnetic
spectrum. Gamma rays (gamma photons) are emitted from
the nucleus of some unstable (radioactive) atoms.
What are the properties
of gamma radiation?
Gamma radiation is very
rad... | <urn:uuid:b21545f5-462d-4679-b8fb-a45f9d675683> | 4.0625 | 1,048 | Knowledge Article | Science & Tech. | 41.566987 |
"That's not what I meant": human communication is fraught with misinterpretation. Written out in longhand, words and letters can be misread. A telegraph clerk can mistake a dot for a dash. Noise will always be with us, but at least a new JQI (*) device has established a new standard for reading quantum information with... | <urn:uuid:36bff55d-91aa-43fb-ad89-0f9a2f3528c4> | 2.984375 | 2,242 | Content Listing | Science & Tech. | 47.581177 |
I am looking through a piece of code and I cannot figure out what this does. I have seen it in other code but as I am just learning java, I was hoping someone could tell me about it. Here is the code snipet:
line = line.replaceAll("\t", " ");
My question is what does \t do in Java??? | <urn:uuid:1f31e17e-4422-4abf-b612-a066006dd45a> | 2.875 | 76 | Q&A Forum | Software Dev. | 79.939868 |
Students can learn how geologists use stratigraphy, the study of layered rock, to understand the sequence of geological events. As students watch baking soda-vinegar "lava" flow from their clay volcanoes, they will see that the lava follows different paths. They will also learn how to distinguish between older and newe... | <urn:uuid:99ce2c1f-fbae-47e1-a402-ab298e242ee3> | 3.75 | 95 | Tutorial | Science & Tech. | 39.331667 |
Daniel Botkin, emeritus professor of ecology at UC Santa Barbara, argues in the Wall Street Journal (Oct 17, page A19) that global warming will not have much impact on life on Earth. We’ll summarize some of his points and then take our turn:
Botkin: The warm climates in the past 2.5 million years did not lead to extinc... | <urn:uuid:e427ac79-68aa-493b-b504-a5492682a6f8> | 2.96875 | 740 | Comment Section | Science & Tech. | 52.143282 |
Last week we proposed a bet against the “pause in global warming” forecast in Nature by Keenlyside et al. and we promised to present our scientific case later – so here it is.
This is why we do not think that the forecast is robust:
Figure 4 from Keenlyside et al ’08. The red line shows the observations (HadCRU3 data),... | <urn:uuid:f973850b-0d59-4abe-934c-cc3630e05790> | 2.8125 | 1,921 | Academic Writing | Science & Tech. | 45.906641 |
I have written the MATLAB code according to the algo given in he tutorials for edge detection.
Edge detection is a technique to locate the edges of objects in the scene. This can be useful for locating the horizon, the corner of an object, white line following, or for determing the shape of an object. The algorithm is ... | <urn:uuid:7ec9a08b-9de3-4992-90e5-5a26bd770fbb> | 2.828125 | 349 | Comment Section | Software Dev. | 44.770238 |
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Bacteria in termite gut... | <urn:uuid:78d4bdd4-5927-4e46-aae7-d92866dd56a2> | 2.703125 | 232 | Content Listing | Science & Tech. | 42.179545 |
April 19, 1996
This document contains a high-level proposal for embedding fonts in HTML documents on the World Wide Web. Clients interact with platform-specific services (called "embedding services" in this document) that provide much of the embedding functionality.
The embedding services used by the clients perform th... | <urn:uuid:c7b76406-7a9c-42c8-9d25-ffd8b8f77740> | 2.90625 | 857 | Documentation | Software Dev. | 41.88008 |
Sequential compression and decompression is done using the classes
BZ2Compressor and BZ2Decompressor.
Create a new compressor object. This object may be used to compress
data sequentially. If you want to compress data in one shot, use the
compress() function instead. The compresslevel parameter,
if given, must be a num... | <urn:uuid:d7610c1a-d921-4d75-9cab-62610b94415e> | 2.859375 | 281 | Documentation | Software Dev. | 50.375341 |
October 4, 2005: Intricate wisps of glowing gas float amid a myriad of stars in this image of the supernova remnant, N132D. The ejected material shows that roughly 3,000 years have passed since the supernova blast. As this titanic explosion took place in the Large Magellanic Cloud, a nearby neighbor galaxy some 160,000... | <urn:uuid:eb362c51-222d-4ae3-8b43-9b171d658de2> | 4.25 | 542 | Knowledge Article | Science & Tech. | 46.355431 |
(Submitted August 15, 1998)
I'm a middle school geography teacher with no formal expertise in,
but a lifelong fascination with, astronomy and space in general.
I seem to remember from a long ago college astronomy course
a discussion of Oblers' Paradox that explains
why we don't have perpetual daylight despite the billi... | <urn:uuid:50288173-7962-4a33-bd98-92118d6da69e> | 3.578125 | 297 | Q&A Forum | Science & Tech. | 46.477452 |
not like the gas carbon dioxide for which only 'crazies' consider a pollutant.
I suppose it could be said astronauts pollute their environment. They do not need to use the larger biosphere("to clean the air") which should tell you how easy it is. In addition to ground transport, air transport is a consideration. (We ca... | <urn:uuid:b0c003c3-8094-4242-b055-387bd1f23831> | 2.84375 | 1,511 | Comment Section | Science & Tech. | 26.738492 |
The computer (or more accurately the compiler) doesn't really care at all what number base you use in your source code. Most commonly used programming languages support bases 8 (octal), 10 (decimal) and 16 (hexadecimal) directly. Some also sport direct support for base 2 (binary) numbers. Specialized languages may supp... | <urn:uuid:0e08e071-3740-495f-909d-38d7f5336f7d> | 3.859375 | 807 | Q&A Forum | Software Dev. | 58.284539 |
Science Fair Project Encyclopedia
A ballistic missile is a missile, usually with no wings or fins, with a prescribed course that cannot be altered after the missile has burned its fuel, whereafter its course is governed by the laws of ballistics. In order to cover large distances ballistic missiles must be launched ver... | <urn:uuid:730f7132-a857-46c4-90e7-d4a007bfd253> | 3.921875 | 649 | Knowledge Article | Science & Tech. | 34.549926 |
Forests losing the ability to absorb man-made carbon
The sprawling forests of the northern hemisphere which extend from China and Siberia to Canada and Alaska are in danger of becoming a gigantic source of carbon dioxide rather than being a major "sink" that helps to offset man-made emissions of the greenhouse gas.
Stu... | <urn:uuid:12b97da4-0dc3-412d-bf88-6b446af586a6> | 3.34375 | 1,086 | Truncated | Science & Tech. | 44.760553 |
Fig 19-17. Section through a young leaf of F. chiloensis. A) stomata, B) air space, C) thick cuticle of upper leaf surface, D) upper epidermal cell, E) palisade cell, F) mesophyll cell. The interior cell surface exposed to air space is from 2.2 to 4.4 times greater than the exposed outer surface; in F. chiloensis it is... | <urn:uuid:991a7d05-5364-4b8c-8798-05739ff3adbc> | 3 | 138 | Knowledge Article | Science & Tech. | 74.59725 |
Color and Vision
Visit The Physics Classroom's Flickr Galleries and enjoy a photo overview of the topic of light and color.Color Television
Explore how a television uses R, G, and B pixels to produce ... millions of colors.PhET Simulation: Color Vision
Mix R, G and B light with varying intensities using this Java apple... | <urn:uuid:5801114e-0305-4468-91c9-85706beda87e> | 3.96875 | 1,365 | Tutorial | Science & Tech. | 50.931962 |
Eutrophication is the biological response of water to overenrichment by plant nutrients, particularly nitrogen and phosphorus. Public concern began to rise in the 1960s (although the term "eutrophication" is older), when nutrient enrichment was rapidly making many bodies of water increasingly fertile. This eutrophicati... | <urn:uuid:459653bf-4a69-4a13-a131-f6816c893a85> | 3.671875 | 1,369 | Knowledge Article | Science & Tech. | 26.41734 |
This section illustrates you how to read and write from/to a serialized file through the hash table in Java. This section provides an example with the complete code of the program. Following program has the facility if the specified serialized file does not exist the the program creates the serialized file otherwise. T... | <urn:uuid:8bf2a0d8-e6d7-4ad2-951d-82b0850b5ff7> | 3.203125 | 211 | Documentation | Software Dev. | 41.85219 |
global - Define global variable
Ordinarily, each Scilab function, has its own local variables and can "read" all variables created in the base workspace or by the calling functions. The global keyword allow to make variables read/write across functions. Any assignment to that variable, in any function, is available to ... | <urn:uuid:a188654e-4c2d-433f-bd66-5251cc50bb99> | 2.734375 | 243 | Documentation | Software Dev. | 38.765388 |
The fputcsv() function formats a line as CSV and writes it to an open file.
This function returns the length of the written string, or FALSE on failure.
|file||Required. Specifies the open file to write to|
|fields||Required. Specifies which array to get the data from|
|separator||Optional. A character that specifies t... | <urn:uuid:5d43d039-7c25-4be0-b2cf-9d5c06f7d319> | 3.34375 | 149 | Documentation | Software Dev. | 55.31249 |
- What is a Cetacean?
- Common Species
- Rare Species
- Other Species
Key FactsLength: Up to 3.8 metres
Range: Widely distributed in all major oceans, absent in polar regions
Threats: Marine litter, pollution, acoustic disturbance
Diet: Manly squid, some octopus and cuttlefish
Latin: Grampus griseus
The Risso's dolphin... | <urn:uuid:e4f04983-806c-4797-b4d7-884e285ff216> | 3.734375 | 729 | Knowledge Article | Science & Tech. | 44.97615 |
Changing Planet: Fading Corals
The delicate balance of life and environment which sustains coral reefs globally is under threat. The dramatic increase in atmospheric CO2 in the past few decades has produced an increase in ocean temperature and acidity. Coral diseases have also been on the increase, due to changes in th... | <urn:uuid:e6b09bbb-6c74-4ab8-96fd-04edf5ee6680> | 3.65625 | 516 | Tutorial | Science & Tech. | 56.299395 |
(rebroadcast of live show)
Target: Grades 3-5
Length: 60 minutes
Guide: Online, see Internet site
Internet: http://scifiles.larc.nasa.gov ⇒
Floating tennis shoes and oil globs wash up on the beach to set the tree house detectives in motion to investigate a unique world under the sea. Join them as they dive into learnin... | <urn:uuid:787072b5-3502-4831-964e-0e0de0d635d8> | 2.6875 | 140 | Truncated | Science & Tech. | 54.898182 |
Using a simple algorithm, Belokurov et. al discovered this almost perfect Einstein-ring around a luminous red galaxy in the SDSS database:
They called it the Cosmic Horseshoe. The ring has a diameter of 10 arcseconds, which counts as large. The lensing galaxy has a mass of about 5 x 1012 solar mass - about ten times th... | <urn:uuid:4812e8bb-6c3e-4b20-9dea-fdf47f61876d> | 2.890625 | 187 | Personal Blog | Science & Tech. | 61.626848 |
Use the following tips and techniques when you design a UML 2.0 Activity Diagram. Usually you create Activity Diagrams after State Machine Diagrams.
To design a UML 2.0 Activity Diagram, follow this general procedure:
- Create one or more activities. You can place several activities on a single diagram, or create a sep... | <urn:uuid:fbb7db04-6d16-42b2-a184-8155e07ac796> | 3.328125 | 472 | Tutorial | Software Dev. | 41.476515 |
When two declarations in the same scope describe the same object or function, the two declarations must specify compatible types. These two types are then combined into a single composite type that is compatible with the first two. More about composite types later.
The compatible types are defined recursively. At the b... | <urn:uuid:9c2223f5-6614-4c73-9814-2eafabe7e1d3> | 3.09375 | 144 | Documentation | Software Dev. | 28.725081 |
Expression statements are used (mostly interactively) to compute and
write a value, or (usually) to call a procedure (a function that
returns no meaningful result; in Python, procedures return the value
None). Other uses of expression statements are allowed and
occasionally useful. The syntax for an expression statemen... | <urn:uuid:a966e3c7-a27a-4567-bbdc-1763d4e67c8a> | 3.265625 | 168 | Documentation | Software Dev. | 39.1603 |
Date: Jan 27, 2013 7:06 PM
Author: Jerry P. Becker
Subject: SAYINGS XLII
Taken from many sources ... some of them identified.
"Hope is a good thing, maybe the best thing. And a good thing never dies."
(Andy Dufrene, from Shaw Shank Redemption/movie)
"If a child can't learn the way we teach, then maybe we should teach
t... | <urn:uuid:ddb7f18d-54de-4e1d-aeb8-435d55053d6f> | 2.6875 | 1,767 | Comment Section | Science & Tech. | 60.217948 |
|Official NOAA climate monitoring station with warm|
air conditioning exhaust blowing on temperature sensor.
Courtesy: Dr. Roger Pielke, Sr.
Also in the news the last two days is that the IPCC (the folks that won the Nobel Prize) have been wrong about increasing malaria due to global warming.
A recent example is the ca... | <urn:uuid:61e1ae79-2715-4427-865f-dcd7043d2300> | 2.875 | 397 | Personal Blog | Science & Tech. | 37.299743 |
Three set of test procedures are used: the first only inserts n random integers into the tree / hash table. The second test first inserts n random integers, then performs n lookups for those integers and finally erases all n integers. The last test only performs n lookups on a tree pre-filled with n integers. All looku... | <urn:uuid:ab19f71f-12f8-44ea-a83f-9fb3639e2e28> | 2.890625 | 844 | Documentation | Software Dev. | 67.187473 |
But electrons in two dimensions can also behave as classical particles that interact only through the mutual repulsion of their negative charges. This occurs when they are spread much farther apart and has been difficult to achieve in the lab, so researchers are still seeing new phenomena. David Rees of RIKEN, a Japane... | <urn:uuid:8056347b-afb8-4458-a201-2e8f6403ea78> | 3.25 | 245 | Personal Blog | Science & Tech. | 43.095385 |
The Earth has one Moon, but it’s not the only rocky thing orbiting us…..Posted: December 21, 2011
I spend far too much time at pub quizzes. Perhaps it’s because I’m an irritating know-it-all or I just like a vaguely intellectual pretense for going to the pub. One of the more geeky parts of it is correcting the quiz-mas... | <urn:uuid:e129c807-068b-4949-a081-bfc5b3ed05f5> | 3.265625 | 833 | Personal Blog | Science & Tech. | 55.906262 |
An important concept that comes from sequences is that of series and summation. Series and summation describes the addition of terms of a sequence. There are different types of series, including arithmetic and geometric series. Series and summation follows its own set of notation that is important to memorize in order ... | <urn:uuid:812b542f-d4de-4cf3-9bff-52518cbabffb> | 4.40625 | 402 | Tutorial | Science & Tech. | 86.384637 |
Surveyor soars toward red planet
Satellite to map Martian surface
November 7, 1996
Web posted at: 1:30 p.m. EST
CAPE CANAVERAL, Florida (CNN) -- NASA launched a 10-month,
unmanned mission to Mars Thursday, the first step in a
multi-spacecraft bid to determine if there is -- or ever was
-- life on the fourth rock from t... | <urn:uuid:88e90af8-1d5c-43bb-99f9-5e5d90cac14b> | 3.0625 | 757 | Truncated | Science & Tech. | 57.151778 |
My Saved Article
|Atomic Number:||33||Atomic Symbol:||As|
|Atomic Weight:||74.9216||Electron Configuration:||2-8-18-5|
|Melting Point:||817 @ 28 atm.oC||Boiling Point:||sublimes @ 613oC|
|Uses:||LEDs, deadly poison, semiconductors|
History(L. arsenicum, Gr. arsenikon, yellow orpiment, identified with
arenikos, male, fr... | <urn:uuid:a283feed-f052-4dc2-bd51-f6d4be44bf24> | 3.140625 | 442 | Knowledge Article | Science & Tech. | 29.915592 |
Technology Transfer Sponsored by
Most consumer attention to oysters and mussels has centered on their taste, beautiful by-products or aphrodisiac effects; however, their adhesive properties are what caught the attention of Jonathan Wilker, PhD, associate professor of chemistry, and his research team at Purdue Universit... | <urn:uuid:19ffe944-e7e9-4824-81bd-a8e9654374da> | 3.71875 | 506 | Knowledge Article | Science & Tech. | 25.190049 |
Dewar flask [for Sir James Dewar], container after which the common thermos bottle is patterned. It consists of two flasks, one placed inside the other, with a vacuum between. The vacuum prevents the conduction of heat from one flask to the other. For greater efficiency the flasks are silvered to reflect heat. The subs... | <urn:uuid:15865bbc-b557-4f4b-9456-d71459f377db> | 3.3125 | 139 | Knowledge Article | Science & Tech. | 53.444167 |
Couple is a system of forces whose magnitude of the resultant is zero and yet has a moment sum. Geometrically, couple is composed of two equal forces that are parallel to each other and acting in opposite direction. The magnitude of the couple is given by
Where are the two forces and is the moment arm, or the perpendic... | <urn:uuid:ff5ee6c4-71e3-4c99-9025-e5f95a169681> | 3.78125 | 169 | Knowledge Article | Science & Tech. | 41.345625 |
Hurricane Philippe and tropical storm Rita formed in the North Atlantic on Sunday, making them the eighth hurricane and seventeenth tropical storm of the season. The US National Hurricane Center (NHC) expects Rita to become a full-fledged hurricane this week, amid fears that it could affect areas hard-hit by deadly Hur... | <urn:uuid:9014c37e-3560-4227-a303-34e756270f12> | 3 | 438 | Truncated | Science & Tech. | 41.756367 |
Assume 14 < n < 30. Make boxes labelled 16-n to 30-n. Let Si be the set of the first i elements. Let si be the sum of the elements of Si. If si is less than or equal to 30-n, put Si in the box labelled si. Otherwise, put it in the box labelled si-n. There are 15 boxes, and 16 subsets, so at least one box has two subset... | <urn:uuid:1294ddef-6dd8-4747-94c9-62093f81d332> | 3 | 189 | Q&A Forum | Science & Tech. | 89.103562 |
Radiation & fractionation
I have been reading up on radiation, but have some trouble fully understanding fractionation. Is there any simple approximation of the relation of fractionation and recovery, or some sort of adjusted effective dose?
A single continuous exposure of 1 Gy over 1 hour, compared to 20 acute doses o... | <urn:uuid:fc9ecbc3-dc48-43b3-bb27-c79c4c9ad985> | 2.734375 | 231 | Comment Section | Science & Tech. | 42.223781 |
More About Ellipses
Steven Dutch, Natural and Applied Sciences,
University of Wisconsin - Green Bay
First-time Visitors: Please visit Site Map and Disclaimer. Use
"Back" to return here.
Find the Center of an Ellipse
Sometimes you have an ellipse but don't know the center. Finding the
center is easy.
- Draw two arbitrar... | <urn:uuid:f07108cc-2222-4284-a944-4269d648096b> | 3.859375 | 439 | Tutorial | Science & Tech. | 48.585211 |
A baseball speeds from the hands of a pitcher, a slave to Newton’s laws. But in the brain of the batter who is watching it, something odd happens. Time seems to dawdle. The ball moves in slow motion, and becomes clearer. Players of baseball, tennis and other ball sports have described this dilation of time. But why doe... | <urn:uuid:5db5cf11-115e-49eb-aa80-55ef0dca96ad> | 3.3125 | 1,364 | Nonfiction Writing | Science & Tech. | 58.192157 |
Because is only 0.7 percent of naturally occurring uranium, its supply is fairly limited and could well only last for about 50 years of full-scale use. The other 99 percent of the uranium can also be utilized if it is first converted into plutonium by neutron bombardment:
The production of plutonium can be carried out ... | <urn:uuid:81fa5386-755b-45d4-a2c0-8d9005faa120> | 3.40625 | 375 | Knowledge Article | Science & Tech. | 35.239351 |
Our knowledge concerning the surface of Venus comes from a limited amount of information obtained by the series of Russian Venera landers, and primarily from extensive radar imaging of the planet. The radar imaging of the planet has been performed both from Earth-based facilities and from space probes. The most extensi... | <urn:uuid:98f84e8a-c73e-4cf2-9c53-4b613f94b23a> | 4.34375 | 622 | Knowledge Article | Science & Tech. | 38.611933 |
A link from one of readers (thanks Ashley!) pointed us to a story on MSNBC about a very large Lion’s Mane jellyfish (Cyanea capillata) that broke apart and stung up to 100 people on a New Hampshire beach last Wednesday. Lion’s Manes can get very big, their bell can be over 3 feet. Their tentacles though are another sto... | <urn:uuid:f918762f-3b67-4ad1-afde-567aa6fdb2e8> | 2.921875 | 863 | Comment Section | Science & Tech. | 63.064304 |
The standard 'Scientific
' explanation is that the carbon-carbon bond
s in diamond are too stable, no enzyme
would be able to overcome the energy barrier
necessary to disassemble diamond.
However, diamond is something of a special case for carbon compounds (oh, fullerenes are probably pretty inedible). There are organi... | <urn:uuid:38c25a29-31f8-41e3-857d-ec29ed46d1b5> | 2.9375 | 165 | Personal Blog | Science & Tech. | 36.135085 |
If you guys remember all of the big genome sequencing projects of the 90s and the early aughts, they’ve been continuing and the amount of raw data they have been giving back to us has exponentially accelerated. However, those of us trying to understand the biological realities of what all of those sequences actually me... | <urn:uuid:3ef7c364-d1af-4794-b165-540dfb009e63> | 2.796875 | 2,487 | Personal Blog | Science & Tech. | 30.832799 |
Marc Buie of the Lowell Observatory describes observations of Pluto in 1996 and their comparison with the 1994 observations that were reported in a 1996 press release. They showed structure on Pluto's surface. He has also compiled a list of "good Pluto WWW Pages," assigning grades of A+ to C for them.
JPL continues to ... | <urn:uuid:50e9f3b6-a817-42e1-b7c1-88d70e105e66> | 3.109375 | 609 | Knowledge Article | Science & Tech. | 46.01259 |
Science subject and location tags
Articles, documents and multimedia from ABC Science
Thursday, 16 December 2010
StarStuff Podcast After a 33-year odyssey, NASA's Voyager 1 spacecraft reaches the very edge of our solar system. Plus: new theory explains rings and ice moons of Saturn; mysterious carbon-rich planet raises... | <urn:uuid:e4fac495-a61c-4e9f-95b0-b3f65fb09b40> | 2.875 | 527 | Content Listing | Science & Tech. | 74.886751 |
Virtual file system Part 1
Virtual File System is an interface providing a clearly defined link between the operating system kernel and the different File Systems. The VFS supplies the applications with the system calls for file management (like “open”, “read”, “write” etc.), maintains internal data structures (the adm... | <urn:uuid:cdb2f748-eadb-46e4-a8f9-7ce30a54c3bf> | 3.640625 | 521 | Documentation | Software Dev. | 34.966883 |