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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Scientists have figured out how to tell what color some dinosaurs were just by looking at their fossils.
Dr. Prum and his colleagues took advantage of the fact that feathers contain pigment-loaded sacs called melanosomes. In 2009, they demonstrated that melanosomes survived for millions of years in fossil bird feathers... | <urn:uuid:6a4c989a-6763-48d4-a1bd-22819dd2c9fa> | 3.84375 | 109 | Personal Blog | Science & Tech. | 41.393362 |
From Sidney Harris, http://www.sciencecartoonsplus.com/originals2.html, see also http://astro.wsu.edu/worthey/astro/html/lec-cartoons.html
Actually, in everyday life the distinctions between wave and particle behavior are seldom observed directly, which is why the concept did not become firmly established until early i... | <urn:uuid:3ab2ac1c-d180-4640-a7dc-5be695ea2e7a> | 3.359375 | 182 | Knowledge Article | Science & Tech. | 46.654558 |
See also the
Dr. Math FAQ:
Browse High School Triangles and Other Polygons
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Area of an irregular shape.
Pythagorean theorem proofs.
- Constructing a Segment [09/26/1999]
Given a 1" segment and a 2.5" s... | <urn:uuid:1c8a66b1-bf07-46f4-b327-2edcc9455167> | 3.359375 | 1,743 | Q&A Forum | Science & Tech. | 66.874563 |
When a battered, skinny tortoiseshell cat wandered into a yard in Florida earlier this year, she could have been any other stray, but she was nothing of the kind. She carried an implanted microchip—one put there by a loving owner—and it revealed an intriguing story: the cat belonged to a local family, had been lost on ... | <urn:uuid:ea273269-b908-4990-842e-a96f7e2b8e39> | 3.5625 | 1,504 | Nonfiction Writing | Science & Tech. | 37.653044 |
The GNU configure and build system can be used to build cross compilation tools. A cross compilation tool is a tool which runs on one system and produces code which runs on another system.
A compiler which produces programs which run on a different system is a cross compilation compiler, or simply a cross compiler. Sim... | <urn:uuid:af81768b-70f4-46aa-91f2-30a3b4432a0f> | 3.5625 | 3,427 | Tutorial | Software Dev. | 47.274499 |
From afar, the whole thing looks like an
A closer look at the
however, shows the
region is actually a window into the center of a larger dark shell of
Through this window, a brightly-lit
where a whole open cluster
of stars is being formed.
In this cavity
tall pillars and
round globules of dark dust and cold
remain wher... | <urn:uuid:81aebd6e-8a8a-4719-8ff3-c55d53ff4c90> | 2.78125 | 178 | Truncated | Science & Tech. | 47.140385 |
table of contents
An overview of the principles and methods in phytoremediation.
Biology Articles » Biotechnology » Green Biotechnology » Phytoremediation (a lecture) » The Principle
- Phytoremediation (a lecture)
- Use plants to "vacuum" heavy metals from the soil through their roots
- Certain species have the ability... | <urn:uuid:58cb2c56-1cb1-4342-855d-64709fc50eff> | 3.84375 | 191 | Truncated | Science & Tech. | 32.504394 |
|Themes > Science > Earth Sciences > Geology > Soils > Soil Composition > Components and Structure > The Soil Community|
The living part of the soil is just as critical to Plant growth as the physical soil structures. Soil microorganisms are the essential link between mineral reserves and plant growth. The cycles that ... | <urn:uuid:d32813c7-e993-4df5-ba37-6bb7e02dab7a> | 3.90625 | 432 | Knowledge Article | Science & Tech. | 29.17659 |
|Themes > Science > Physics > Atomic Physics > Spin|
In particle and atomic physics, there are two types of angular momentum: spin and orbital angular momentum:
1. Spin is a fundamental property of all elementary particles, and is present even if the particle is not moving:
2. Orbital angular momentum results from the ... | <urn:uuid:8af61329-3889-4c48-a6ed-1ef9abc47d9c> | 4.21875 | 420 | Knowledge Article | Science & Tech. | 37.279026 |
Hi Guys, Was asked this quesion by my lecturer(& was left speechless ) Heres' the question...
SUGGEST A WAY BY WHICH POINTERS CAN BE IMPLEMENTED IN Java...!!
The question expects a suggestion that has a mechenism that shows pointers being implemented logically in java code... I have heard that it can be done using inte... | <urn:uuid:46406f4c-6269-490d-b2f1-70896c6c3c48> | 2.96875 | 356 | Comment Section | Software Dev. | 72.355233 |
Global warming appears to have stalled. Climatologists are puzzled as to why average global temperatures have stopped rising over the last 10 years. Some attribute the trend to a lack of sunspots, while others explain it through ocean currents.
By Gerald Traufetter
At least the weather in Copenhagen is likely to be coo... | <urn:uuid:37751b4a-da58-4637-ab33-826a85444ae3> | 3.15625 | 209 | Truncated | Science & Tech. | 26.59885 |
Operators In PHP
Operators In PHP
This article is the second of a series of PHP guides that aim at teaching you the basics of PHP programming.
I hope you would have been practising the last lecture ( PHP Programming Basics ) as I am getting feedback from different students from different countries and I am very happy I... | <urn:uuid:85793f71-4e8a-48f1-89b9-dbdcca23e23e> | 3.796875 | 1,106 | Tutorial | Software Dev. | 41.080127 |
Lugo should have put the steps in reverse order or at least mention that each step is reversible.
He has reversible steps in each of his examples. This corresponds to each statement being
equivalent to the next. This is logically the same as saying that if A,B,C,D are statements
then we have A <=> B <=> C <=> D. This b... | <urn:uuid:834bfdbd-3c1c-4e76-a45f-e5655c4d4cab> | 3.84375 | 1,239 | Comment Section | Science & Tech. | 70.30697 |
Please PLEASE read the following and solve this problem:
I am basically doing a frustrum of a cone, what i need to do in the question is re-arrange the volume for cone to make H the subject and substitute this H in the Surface area formula for cone. If u get what i mean!!!!!!!!! Now the problem is this, i made a diagra... | <urn:uuid:0faa3236-3a88-4192-a961-3db6ae77f06f> | 3.546875 | 399 | Q&A Forum | Science & Tech. | 102.645668 |
USING a mirror controlled by a single atom, physicists in California are on the brink of creating a photon molecule.
Photons do not normally interact with one another in the way that atoms in a molecule do. But Joseph Jacobson and his colleagues at Stanford University are confident that the device they are constructing... | <urn:uuid:f306e5f5-6458-4b5f-9fbc-f388bc3a943a> | 3.734375 | 210 | Truncated | Science & Tech. | 51.045837 |
Miragaia, named for the area in which it was found (Miragaia, Portugal), is a genus of stegosaurid dinosaur from the Late Jurassic Period (approximately 150 million years ago). A fairly complete half skeleton and partial skull were discovered. It was described by Octávio Mateus and his colleagues in 2009. The type spe... | <urn:uuid:22d5aa76-04ea-4a48-8af2-ebeab210f5aa> | 4.0625 | 257 | Knowledge Article | Science & Tech. | 41.198007 |
The Java Dateformat class is used to format the date/time in Java applications. You can use the Dateformat class while generating the report to format the date/time in required format.
To format a date for the current Locale, use one of the static factory methods:
String myString = DateFormat.getDateInstance().format(m... | <urn:uuid:22416ddb-c76f-4e44-9c95-e078790442a0> | 3.015625 | 186 | Documentation | Software Dev. | 36.67 |
Aug. 17, 2012 The forests of the coastal regions from California to British Columbia are renowned for their unique and ancient animals and plants, such as coast redwoods, tailed frogs, mountain beavers and the legendary Bigfoot (also known as Sasquatch). Whereas Bigfoot is probably just fiction, a huge, newly discovere... | <urn:uuid:cce9294d-a922-424d-9fe5-cbcf8bb9897f> | 3.578125 | 561 | Knowledge Article | Science & Tech. | 28.548726 |
A La Nina Like No Other Or Just A Big One
for NASA Global Climate Change Team
Pasadena CA (JPL) Feb 11, 2011
1. What is La Nina and why does it matter?
La Nina, "little girl" in Spanish, is the cool part of a naturally-occurring climate cycle called the El Nino/Southern Oscillation. El Nino is the warm part at the othe... | <urn:uuid:8ce62ed4-a8e5-4c5a-9135-90370cb3cdf8> | 3.4375 | 1,161 | Nonfiction Writing | Science & Tech. | 47.098785 |
A Module is a collection of methods and constants. The methods in a module may be instance methods or module methods. Instance methods appear as methods in a class when the module is included, module methods do not. Conversely, module methods may be called without creating an encapsulating object, while instance method... | <urn:uuid:7673106c-4d66-41b0-84a3-1881c543a4e1> | 3.25 | 151 | Documentation | Software Dev. | 52.276123 |
Delphi Programming RTL Reference|By Category|Alphabetically|By Unit
function Trim(const S: string): string;
Returns a string containing a copy of a specified string without both leading and trailing spaces and non-printing control characters.
String Types in Delphi
var s : string;
s:=' Delphi ';
s := Trim(s);
Understan... | <urn:uuid:f9dbec0a-243b-458a-b9cc-001fb058b6bb> | 2.796875 | 140 | Documentation | Software Dev. | 52.296292 |
A quick ecology quiz: Is there more life in cold waters or warm waters?
Our journey has provided some wonderful empirical evidence on this question. When we set out from Cape Town, water temperatures in the Atlantic hovered around 50 degrees Fahrenheit. When we reached Richards Bay in northeastern South Africa, the Ind... | <urn:uuid:6a45f0e5-86b8-409b-8813-340d2e8cb495> | 3.359375 | 393 | Personal Blog | Science & Tech. | 59.054685 |
Nature's Bank Account
Money doesn’t grow on trees, so how do we put a monetary value on nature?
BY STEPHEN POLASKY
The best things in life are free—an evening with friends, a summer day at the lake, hiking in the forest on a crisp autumn morning. But just because these things are free doesn’t mean we can take them for ... | <urn:uuid:862dd71e-8fcc-4786-9cfe-6d67bbd76318> | 3.125 | 824 | Nonfiction Writing | Science & Tech. | 30.726976 |
Every warm body emits electromagnetic radiation. In general, the warmer the emitter, the shorter the wavelength of the radiation. The Sun, with its photosphere of 6000° K, emits in a short wavelength band called ultraviolet to visible. Since the Earth's atmosphere is largely transparent to solar radiation, the Sun's ra... | <urn:uuid:3e30cb10-4d17-422c-ac17-5d6b14c1de76> | 4.03125 | 144 | Knowledge Article | Science & Tech. | 28.615 |
Recently, my wife and I went and saw Avatar in 3D at the local cinema. They used RealD 3D glasses that look just like sunglasses. Rather than dropping ours in the recycling bin after the movie, I took them back to the lab to play with, because they have some interesting optical properties.
Here’s a view through one of ... | <urn:uuid:91c9c097-d650-459e-a438-370ae0d426c0> | 3.25 | 1,694 | Personal Blog | Science & Tech. | 49.580048 |
Begin your search for information on properties with the resources listed here.
See also resources listed by
properties, materials and substance. Tip: Look for the substance (e.g. Gallium Arsenide) in a handbook or encylopedia. Often there is a section on properties. You may need to back up further (e.g. Gallium) to fi... | <urn:uuid:93122771-d486-43ce-b032-c54f863ef5b0> | 2.921875 | 349 | Content Listing | Science & Tech. | 47.296138 |
The Apache distribution comes with a script to control the server called apachectl, installed into the same location as the httpd executable. For the sake of the examples, let's assume that it is in /home/httpd/httpd_perl/bin/apachectl.
All the operations that can be performed by using signals can also be performed on ... | <urn:uuid:dad35ba8-7f49-41d2-a09e-33fac4862097> | 3.234375 | 615 | Documentation | Software Dev. | 45.115588 |
Copyright © University of Cambridge. All rights reserved.
The picture above shows four equal weights on one side of the scale and an apple on the other side.
What can you say that is true about the apple and the weights?
If the apple weighs $180g$, how heavy must one weight be?
If the apple weighed $375g$, how heavy wo... | <urn:uuid:29dd6470-f3ba-4449-bca8-0d2bb75ee9c9> | 2.9375 | 119 | Q&A Forum | Science & Tech. | 80.133889 |
Titan may have an icy surface
Apr 25, 2003
The surface of Titan, Saturn’s largest moon, may contain frozen water. Caitlin Griffith at the University of Arizona and colleagues at the Institute for Astronomy in Honolulu, the Gemini Observatory and the Université Pierre et Marie Curie measured the infrared spectrum of the... | <urn:uuid:85e5c01d-d843-4eba-bc9b-45678b3e58ec> | 3.71875 | 460 | Truncated | Science & Tech. | 50.004476 |
Major Section: PROGRAMMING
See hard-error, see illegal, and see cw for examples of functions
to call in the first argument of
(Prog2$ x y) equals
y; the value of
x is ignored.
x is first evaluated for side effect. Since the ACL2
programming language is applicative, there can be no logical impact
x may involve a call of... | <urn:uuid:9774162a-ffb3-4464-b81c-50042669fd14> | 2.8125 | 507 | Documentation | Software Dev. | 59.807571 |
Question: Would it be theoretically possible to deduce the masses and distances of the other planets in our Solar System solely by observing the movement of our Sun? (Looking at the movement of the parent star is one way to detect exoplanets, isn't it?)
It is a bit harder because we are ‘in’ the Solar System, but techn... | <urn:uuid:3e653741-f44e-4e3a-8d44-c2f399808303> | 3.015625 | 283 | Q&A Forum | Science & Tech. | 56.907704 |
Google introduced a new component called Web which gives you the functionality to send and fetch data from a server or a website through GET and POST requests. This component can decode both JSON and HTML formatted data. We will be writing an app called iRead that will ask a user to type in a full or partial book name ... | <urn:uuid:2ec4766c-7c87-4401-9710-a69d0a467dec> | 2.828125 | 816 | Tutorial | Software Dev. | 64.107931 |
A manipulative parasitic wasp
Back to spider home
William Eberhard (2000) describes an interesting relationship between a
female wasp parasite, Hymenoepimecis sp., (Ichneumonidae) and its spider host, Plesiometa
argyra (Araneidae). Although these species do not occur in southern
Africa, they illustrate an interesting i... | <urn:uuid:827b8d0a-489c-467f-9c1d-bec4d300c418> | 2.765625 | 578 | Knowledge Article | Science & Tech. | 49.617983 |
Volume 8, Number 49: 7 December 2005
Climate alarmists have long contended that the historical and still-ongoing rise in the air's CO2 content - aided and abetted by the historical increase in atmospheric methane concentration - will lead to dangerous global warming that could rival temperature increases experienced du... | <urn:uuid:fa378482-ccc8-4869-bf7d-7735392cf5f9> | 3.203125 | 1,609 | Academic Writing | Science & Tech. | 67.849604 |
Optimize with a SATA RAID Storage Solution
Range of capacities as low as $1250 per TB. Ideal if you currently rely on servers/disks/JBODs
And so it is with type and class. In the seminal work Object Oriented Analysis and Design with Applications, (Addison Wesley, 1994), Grady Booch declares, "For our purposes, we will ... | <urn:uuid:cb2bffc7-d6b1-4fd5-9811-579f2037ac96> | 2.96875 | 586 | Documentation | Software Dev. | 22.272431 |
The dream of faster-than-light travel has been on the mind of humanity for generations. Until recently, though, it was restricted to the realm of pure science fiction. Theoretical mechanisms for warp drives have been posited by science, some of which actually jive quite nicely with what we know of physics. Of course, t... | <urn:uuid:f5dcfd5c-8f20-4bc4-b97f-b1d173f230b3> | 3.453125 | 696 | Comment Section | Science & Tech. | 46.537222 |
Search our database of handpicked sites
Looking for a great physics site? We've tracked down the very best and checked them for accuracy. Just fill out the fields below and we'll do the rest.
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We found 16 results on physics.org and 112 results in our database of sites
111 are Websites,
1 is a Videos,
an... | <urn:uuid:ac5b6421-1053-432c-97c3-23a88ad3fd4b> | 3.09375 | 351 | Content Listing | Science & Tech. | 50.22521 |
Web edition: July 20, 2012
Thirty years ago, the California condor came dangerously close to extinction. Biologists took action, and their efforts worked. The big, bald birds lived, and their numbers grew — from 22 in 1982 to several hundred today.
But the bird’s apparent success story may be misleading, a new study fi... | <urn:uuid:775fd7de-61f5-4321-b16a-1521b03ebeb8> | 3.640625 | 96 | Truncated | Science & Tech. | 59.634 |
INSPIRATION for Ibis Therapeutics's broad-scan biodetector came when company president David J. Ecker realized that a method used to screen for potential RNA-binding drugs might provide a means of looking for pathogens. Image: Courtesy of ISIS PHARMACEUTICALS
Chance is often the best inventor. Isis Pharmaceuticals neve... | <urn:uuid:db392a0f-4181-472d-aa6b-527b18a73744> | 2.734375 | 1,087 | Truncated | Science & Tech. | 32.567584 |
DailyDirt: Life, Life Everywhere
from the urls-we-dig-up dept
Evidence of life hasn't been found outside of our planet (yet?), but life seems to be getting into nearly every nook and cranny of our dear Earth. Places that seem too cold or hot or dark have been shown to harbor life forms that survive in unusual ways, eat... | <urn:uuid:5ec7f245-38c2-4376-949c-1cc856c2a749> | 2.796875 | 291 | Listicle | Science & Tech. | 49.019692 |
Orion shows us colorful examples of stars that astronomers designate red, white and blue, Teske says. Decide for yourself if each stars color lives up to its advertised hue.
Betelgeuse, marking Orions left (eastern) shoulder, is extremely red according to the way astronomers determine star color, Teske explains. Bellat... | <urn:uuid:6f348d54-acbe-49cc-9d51-c440edad940f> | 3.90625 | 647 | Knowledge Article | Science & Tech. | 42.493205 |
du - estimate file space usage
du [-a| -s][-kx][-r][file ...]
By default, the du utility writes to standard output the size of the file space allocated to, and the size of the file space allocated to each subdirectory of, the file hierarchy rooted in each of the specified files. The size of the file space allocated to ... | <urn:uuid:97c43983-58f9-4a06-bf06-589eeb118183> | 2.953125 | 645 | Documentation | Software Dev. | 36.173675 |
An acorn worm appears as a bright orange or red acorn sticking out of the surface of muddy or sandy shores. Learn about acorn worms.
Acorn worm is the name for many similar animals of the phylum Hemichordata. Within its natural habitat an acorn worm appears as a bright orange or red acorn sticking out of the surface of... | <urn:uuid:3f409024-97c4-47d3-a22c-db3a79a71fdd> | 4.09375 | 759 | Knowledge Article | Science & Tech. | 52.078804 |
Eomaia scansoria: discovery of oldest known placental mammal
In Nature 416 816 - 822, Ji et al report a fossil of the earliest known eutherian (placental) mammal (1).
|Eomaia scansoria (Chinese Academy of Geological Sciences (CAGS) 01-IG-1a, b; holotype). a, Fur halo preserved around the skeleton (01-IG-1a, many struct... | <urn:uuid:4f7dc697-fd6f-404f-b8da-ef106126dacc> | 3.265625 | 1,092 | Knowledge Article | Science & Tech. | 39.234759 |
In a solution, the solvent is generally a liquid, which can be a pure substance or a mixture. The species that dissolves, the solute, can be a gas, another liquid, or a solid. Solubilities range widely, from infinitely soluble such as ethanol in water, to poorly soluble, such as silver chloride in water. The term insol... | <urn:uuid:08416d03-24f6-4faf-9ca7-827ba533783b> | 4.0625 | 2,372 | Knowledge Article | Science & Tech. | 28.745806 |
“If there is a tragic figure in modern physics it has to be George Sudarshan from Kerala. Sudarshan has been passed over for the Physics Nobel Prize on more than one occasion, leading to controversy in 2005 when several physicists wrote to the Swedish Academy, protesting that Sudarshan should have been awarded a share ... | <urn:uuid:cb86501c-b83b-4f7a-9c85-50a8b84c7509> | 3.34375 | 3,179 | Personal Blog | Science & Tech. | 46.545246 |
In organic chemistry, cis/trans isomerism (also known as geometric isomerism) is a form of stereoisomerism describing the relative orientation of functional groups within a molecule. It is not to be confused with E/Z isomerism which are related absolute stereochemical descriptors, only to be used with alkenes. In gener... | <urn:uuid:20a2ec9c-4d2c-4e8e-85e9-90835318353d> | 3.890625 | 2,250 | Knowledge Article | Science & Tech. | 45.789219 |
I wanted to ask under what conditions will charges not flow in a closed circuit. Or when is current through the circuit zero even when an EMF is applied? Like in the case of potentiometer, we say that we are measuring the emf of the battery because current through the secondary circuit is 0? So what condition are we fu... | <urn:uuid:79ed96d1-5fb4-4619-9314-a6c37228459c> | 2.75 | 227 | Q&A Forum | Science & Tech. | 37.02799 |
Individual differences |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
A membrane protein is a protein molecule that is attached to, or associated with the membrane of a cell or an organelle. More than half of all proteins interact with membranes. Membrane proteins... | <urn:uuid:0d5641f4-4b95-4227-92cc-abf4d1717af0> | 3.5 | 1,032 | Knowledge Article | Science & Tech. | 32.647026 |
Check out the picture accompanying this post (courtesy NASA). It is a graphical timeline of the history of our universe. Let's walk through it step by step - from left to right.
Quantum Fluctuations: the universe starts off as a tiny blob of quantum fuzz, perhaps 0.000...thirty more zeroes...1 centimeters in size; basi... | <urn:uuid:476b5396-e9f7-45ff-aad0-0fba58f7e748> | 3.546875 | 617 | Personal Blog | Science & Tech. | 48.592566 |
Most land snail species that have teeth or lamellae in the apertures of their shells develop them as they near sexual maturity. In a handful of species, such apertural formations are present in young snails, but diminish in number and size or disappear completely in adults. The North American snail Ventridens suppressu... | <urn:uuid:93474e33-0fea-405d-b912-c453889fc9e6> | 3.5625 | 318 | Personal Blog | Science & Tech. | 52.233406 |
I am reading a book for Java that I am trying to learn, and I have a question. I can't understand which is the difference between the variable type "char" and "string". For example, there is a difference between "int" and "short", the bytes at the memory and the area of numbers that they have.
But what is the differenc... | <urn:uuid:a9c1e09c-3d8a-4b8d-ba6e-26f4a28c2a44> | 3.078125 | 126 | Q&A Forum | Software Dev. | 69.633871 |
Substring is O(n) rather than the O(1) of Java. This is because in .NET, the String object contains all the actual character data itself1 - so taking a substring involves copying all the data within the new substring. In Java,
substring can just create a new object referring to the original char array, with a different... | <urn:uuid:f92b9dd8-6888-4d53-9eb9-232aa3734689> | 2.71875 | 348 | Q&A Forum | Software Dev. | 53.869692 |
Credit: Herb Thornby
As you may know, I’m teaching a General Relativity course this term, and so I have spacetime on the brain. So it’s particularly fun when I get relativity-oriented emails. This morning, for instance, I found a question from a reader named Dawn who asks:
Okay, the info out there seems to be all about... | <urn:uuid:4af66427-855d-4979-a1ec-7fef4b1a6e45> | 3.078125 | 3,512 | Personal Blog | Science & Tech. | 57.014127 |
Ask a question about 'Perilla ketone'
Start a new discussion about 'Perilla ketone'
Answer questions from other users
is a natural terpenoid
The terpenoids , sometimes called isoprenoids, are a large and diverse class of naturally occurring organic chemicals similar to terpenes, derived from five-carbon isoprene units ... | <urn:uuid:187290eb-8b1d-4ed2-aebb-3f695c3915f7> | 2.71875 | 484 | Q&A Forum | Science & Tech. | 39.214209 |
How do you make a hurricane? The recipe calls for two key ingredients: heat and moist air. Hurricanes are caused when intensely low pressure areas form over warm ocean waters, usually in the summer and early fall.
Warm sea surface temperatures of at least 80 degrees fuel hurricanes. Water evaporates off the ocean's sur... | <urn:uuid:a1ae16b7-56ee-4665-a2bc-278d19b13cb3> | 4.21875 | 323 | Knowledge Article | Science & Tech. | 59.339167 |
An unstrained horizontal spring has a length of 0.30 m and a spring constant of 240 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes. Because of these charges, the spring stretches by 0.031 m relative to its unstrained length. Determine (a) th... | <urn:uuid:ead9dd8e-cd73-4e4a-ae0b-1eb77722e93a> | 3.46875 | 90 | Tutorial | Science & Tech. | 75.447391 |
When a variable is declared, it is declared with a particular type. The type tells what kind of values the variable can have, and what the possible operations on that type are.
There are eight primitive types in Java; these are the basic building blocks from which all other types are constructed. In addition, Java defi... | <urn:uuid:90f1d1b4-c306-4380-b849-89823dd8d21d> | 3.796875 | 156 | Documentation | Software Dev. | 34.136429 |
The main benefit of Object Oriented Design (that is, designing a program using classes) is that you can model your program towards real life creating separate components and that these components.
In practice, let's consider a game, like pacman.
If you would describe pacman to someone, you could say "pacman is a game w... | <urn:uuid:74e446cc-691f-4cce-8558-b20bb5dea40b> | 3.625 | 588 | Comment Section | Software Dev. | 61.495079 |
all, section 5.
5. Class Relationships
Class declarations define new
reference types and describe how they are implemented.
Constructors are similar to methods,
but cannot be invoked directly by a method call; they are used to
initialize new class instances. Like methods, they may be overloaded.
Static initializers are... | <urn:uuid:e91054e1-8cf5-4ba9-b19c-e8f87e2ad2a9> | 3.640625 | 290 | Documentation | Software Dev. | 35.150883 |
A teacher friend called recently with a strange message. “I just found out that a lot of people don’t know what tree acorns grow on.”
He (I will call him John because that’s his name) first became aware of this strange phenomenon after another teacher asked him the question. The other teacher didn’t know. John got to w... | <urn:uuid:13dfaa57-1cc0-44c2-a79f-de7af3556843> | 2.84375 | 896 | Personal Blog | Science & Tech. | 56.751393 |
Last year about 300 million compact fluorescent bulbs (CFLs) were sold in the U.S., thanks to people being more concerned about global warming.
The only bad thing about CFLs is that they contain small amounts of mercury in them, so when they are thrown away and broken the toxic vapors from the mercury can be inhaled by... | <urn:uuid:29c91ff3-0de0-44b8-ad1d-86541d04c857> | 3.6875 | 249 | Knowledge Article | Science & Tech. | 54.235714 |
BIOTIC Species Information for Balanus spp.
|Click here to view the MarLIN Key Information Review for Balanus spp.|
|Researched by||Dan Bayley|
|Refereed by||This information is not refereed.|
|Growth form||Feeding method||Active suspension feeder
|Typical food types||Zooplankton, detritus||Habit||Attached|
|Bioturbato... | <urn:uuid:e6e878b4-045e-4dfc-aee2-773bc64cf118> | 3.15625 | 314 | Knowledge Article | Science & Tech. | 29.705803 |
Introduction of Cloud in Visual Studio 2010
In this article I am going to
explain a brief introduction of cloud programming in Visual Studio 2010.
Cloud computing is internet
based computing, whereby shared resources, software and information are provided
Windows Azure: Windows Azure is a Microsoft
cloud computing plat... | <urn:uuid:feb4200d-f897-4f54-b55b-d0b718420301> | 2.9375 | 785 | Truncated | Software Dev. | 30.533373 |
Joined: 03 Oct 2005
|Posted: Wed Dec 21, 2005 10:29 am Post subject: Nanoparticle Drug-Release in Response to pH Level in Cells
|Researchers at Georgia Institute of Technology Use Polymeric Nanoparticles to Release a Drug in Response to a Cancer Cell’s pH Environment
One of the characteristics that distinguish a cancer... | <urn:uuid:e5a9a882-5cfe-4ee6-b848-41fdf166530a> | 3 | 378 | Comment Section | Science & Tech. | 35.311531 |
THERE'S water, water, everywhere in the cosmos, but how it comes about in the interstellar clouds that give birth to stars, planets and even life is a bit of a mystery. The answer, it seems, may lie on the surface of frosty dust grains.
When hydrogen and oxygen exist as gases water forms easily, but models of interstel... | <urn:uuid:26f0f7ba-2972-4e5e-8eea-1922c48e8686> | 4.09375 | 210 | Truncated | Science & Tech. | 44.025868 |
I wonder if you can help, I work with science teachers and
have recently been given an Aepinus condenser. I have never come
across one before and having searched for ages on the Internet
cannot find out how to use the equipment. Can you please explain to
me how you operate one?
How about presenting it as a simple charg... | <urn:uuid:899989dc-718b-4dc7-acb5-6432bf13f39c> | 3.296875 | 392 | Q&A Forum | Science & Tech. | 43.803446 |
J. Craig Venter, one of the first geneticists to sequence the human genome, has been called many things arrogant, antagonistic, even daring to play God. But no matter how polarizing he may be, few of his colleagues or critics would deny that he has made monumental advancements in the world of science. This year Venter ... | <urn:uuid:f685c212-927b-425d-8952-df36cf1c1923> | 2.859375 | 218 | Truncated | Science & Tech. | 38.55566 |
It is often observed that girls do not perform as well as boys in mathematics. This difference is often overstated and it’s cause is often highly debated. Many people have suggested that the basis for this difference is essentially biological.
It is now well established that a society’s attitude toward gender will sign... | <urn:uuid:9ec879ca-8ad7-4b97-a4ae-98dfff6f1017> | 3.46875 | 258 | Knowledge Article | Science & Tech. | 36.208109 |
Thursday, May 3, 2012 - 14:30 in Earth & Climate
WASHINGTON (AP) -- Greenland's glaciers are hemorrhaging ice at an increasingly faster rate but not at the breakneck pace that scientists once feared, a new study says....
- Greenland ice cap melting faster than everThu, 12 Nov 2009, 14:47:21 EST
- Fast-shrinking Greenla... | <urn:uuid:2bb9f182-d9aa-49e0-b126-f97f2cc48309> | 2.71875 | 173 | Content Listing | Science & Tech. | 68.458523 |
1. You encounter many organic compounds everyday. Some organic compounds are ethanol (grain alcohol) and acetone (nail polish remover). Please, list other organic compounds which can be found around you in everyday life.
2. Hydrocarbon is one of the organic compound that mainly contains carbon and hydrogen. Which of th... | <urn:uuid:80584ca9-232b-4a75-93e4-5bd3865702a4> | 3.734375 | 632 | Tutorial | Science & Tech. | 41.170669 |
Of the new candidates, 68 are one-and-a-quarter times the size of the Earth or smaller — smaller, that is, than any previously discovered planets outside the solar system. Another 50 of these so-called exoplanets are in the habitable zones of their stars, where temperatures should be moderate enough for liquid water, t... | <urn:uuid:9c4b54e9-62c2-4c91-99cf-64946a1c96d0> | 2.953125 | 177 | Truncated | Science & Tech. | 31.877911 |
Have you ever wondered how electricity is produced by a photovoltaic — what we often call a PV or solar electric — system? We'll help you understand by covering the basics of PV technology, which includes the underlying physics, how various PV devices are designed and become fully functional systems, and what's happeni... | <urn:uuid:4472f7db-11e8-4d78-85cd-3095167edaf2> | 3.6875 | 2,104 | Knowledge Article | Science & Tech. | 30.781454 |
Sampling ocean, seep, and hot-spring fluids in the deep sea
During this expedition, as the R/V Thompson transits from near shore to blue water environments, we will be sampling at depths of <500 to >2500 m to investigate the chemistry of ocean water. Specific sites include those off Grays Harbor, Washington, Newport, O... | <urn:uuid:62ea4618-032f-4b00-9a39-593c3a2ef41c> | 2.953125 | 445 | Knowledge Article | Science & Tech. | 29.031106 |
During the 70s and into the early 80s, C compilers were relatively easy to come by for personal computers, although most only did a subset of C (which is why you'll see so many different "tiny C" compilers adverts in the older magazines). Pascal was a larger more cumbersome language back in the days when only the wealt... | <urn:uuid:811b0bb6-e3d6-4950-8c92-4b4eab75d4b9> | 2.703125 | 423 | Q&A Forum | Software Dev. | 40.253221 |
Reverse Every K Nodes Of A Linked List
August 26, 2011
Here is another from our collection of interview questions:
Given a list of elements and a block size k, return the list of elements with every block of k elements reversed, starting from the beginning of the list. For instance, given the list 1, 2, 3, 4, 5, 6 and ... | <urn:uuid:7e29a6a4-d963-4cb2-9819-b57257992062> | 2.6875 | 154 | Tutorial | Software Dev. | 62.180636 |
Observing Basics: Finder Scopes
In this episode, learn how this small auxiliary telescope helps you better tour the night sky.
A finder scope has a lower magnification than your main telescope so it can provide a wider view of the sky, which allows you to more easily star-hop your way from target to target. These instr... | <urn:uuid:a04cc19f-addb-4d5d-951f-a8185b43b340> | 3.46875 | 283 | Tutorial | Science & Tech. | 53.509916 |
POLAR BEAR } Ursus maritimus
HABITAT: Polar bears live throughout the ice-covered waters of the circumpolar Arctic, with distribution dependent on food availability and sea-ice conditions; they are most often found at the convergence of sea ice and open water, and where seals congregate. These bears are totally reliant... | <urn:uuid:f95ab735-f350-40b4-a94d-f5392366eb91> | 3.8125 | 964 | Knowledge Article | Science & Tech. | 33.193977 |
What you are looking at is a faint planetary nebula. A planetary nebula is a star near the end of its life cycle. It has already burned up all its hydrogen, helium, and carbon that once fueled the star, and is left with only a very white carbon star. Therefore it still emits intense ultraviolet radiation and this radia... | <urn:uuid:08962fcc-4a45-4c61-8dc9-a2a71eea6da8> | 3.671875 | 409 | Knowledge Article | Science & Tech. | 61.285092 |
Thank you for the opportunity to talk with you today about invasive species. I am David Strayer, a Senior Scientist at the Cary Institute of Ecosystem Studies, an independent ecological think-tank in Millbrook, New York. I have a Ph.D. in Ecology and Evolutionary Biology from Cornell University, and have been doing res... | <urn:uuid:d1ae7559-af13-4fe2-889b-823cd7f5aadc> | 3.375 | 1,357 | Audio Transcript | Science & Tech. | 33.078097 |
What Happens After A Failure?
Last week , I distinguished between two kinds of software failure. In one kind, the program fails to produce a correct result; in the other, it produces an incorrect result. The difference between these two cases is whether the software's user can tell that the program has failed. For now,... | <urn:uuid:8aa0a94b-da0a-4dc6-b595-dec472f91a64> | 2.96875 | 819 | Personal Blog | Software Dev. | 48.57979 |
from the Charles-plans-new-use-for-his-sailing-skills dept.
Senior Associate Charles Vollum reports "An article on CNN's website discusses recent successful demonstrations of sails for space propulsion at JPL and Wright-Patterson Air Force Base."
This entry was posted
on Thursday, July 6th, 2000 at 4:35 PM and is filed... | <urn:uuid:4d3ecbe7-5cb2-4735-b96d-c36de3b514aa> | 2.828125 | 116 | Comment Section | Science & Tech. | 72.253577 |
This week's element is molybdenum, which will please the biologists who are reading because it is essential for life. Molybdenum has the symbol Mo and atomic number 42. It is a beautiful, lustrous silver-coloured metal that was often confused with lead, hence its name, which comes from the Greek, molybdos, for lead.
Mo... | <urn:uuid:2bb59b63-a342-485c-9cbd-ff6c1f33adcb> | 4.375 | 997 | Listicle | Science & Tech. | 49.651892 |
SCIENCE IN THE NEWS
I'm Bob Doughty with Sarah Long, and this is the VOA Special English program SCIENCE IN THE NEWS.
This week -- a report on the powerful storms of this past month ... news of a new dinosaur, and the oldest modern European ... and, a look at one way feeling happy may be good for the health.
Earlier th... | <urn:uuid:aef53e58-6937-4fa2-995b-6dd132d20cf5> | 3.171875 | 1,617 | Audio Transcript | Science & Tech. | 51.145954 |
Aegagrophila linnaei is a filamentous green algae in freshwater and some brackish-water coastal habitats and has three different growth forms:
The lake balls have been the source of much fascination and are on stamps issued in Iceland and Japan. In the Hokkaido district of Japan they are part of the local folklore wher... | <urn:uuid:8e52db01-06f5-4903-9847-9ea8df5301ea> | 3.015625 | 381 | Knowledge Article | Science & Tech. | 38.832899 |
1. Why use Producer/Consumer?
The Producer/Consumer pattern gives you the ability to easily handle multiple processes at the same time while iterating at individual rates. What makes this pattern unique is its added benefit of buffered communication between application processes. When there are multiple processes runni... | <urn:uuid:39b796f8-7314-4e01-8b6d-1b724d4b8532> | 3.734375 | 862 | Tutorial | Software Dev. | 35.400814 |
Courtesy Staplegunther via Wikimedia Commons
Courtesy Ceinturion via Wikimedia Commons
We use lots of energy. And, as world population grows and countries develop, we're going to be using a lot more. Most of our energy comes from fossil fuels—materials in limited supply that will take millions of years to replenish. An... | <urn:uuid:c333471e-045a-4a40-82e8-1efdfcd7b19f> | 4 | 401 | Knowledge Article | Science & Tech. | 31.775695 |
The kilogram is defined by a lump of metal in Paris but several comparisons with identical copies showed that its mass is changing. That’s why the kilogram needs to be redefined.
Scientists want to redefine the SI units in terms of fundamental constants of nature. To redefine the kilogram scientists use the Quantum-Hal... | <urn:uuid:af674fe1-fe18-4358-aca4-3b5d0b3131a9> | 3.546875 | 113 | Knowledge Article | Science & Tech. | 50.385 |
Department of Astronomy and Astrophysics
University of Chicago
Recession of the galaxies: distant objects
appear to be moving away from us.
Cosmic Microwave Background: we are bathed
in primordial light.
The big bang or hot expanding model of cosmology finds strong
support from the recession of the galaxies, that is, w... | <urn:uuid:6c3e2a86-6c66-4baf-92c4-a26fb3cd25ab> | 2.828125 | 486 | Nonfiction Writing | Science & Tech. | 42.791913 |
Scientists from Germany and Ireland have been studying types of bacteria that are prominent in bogs and sewage plants to research the link between bacteria cells and cells with a nucleus, the eukaryotes. Prior to these studies it was widely suggested that there was perhaps not some intermediate cell, rather a type of f... | <urn:uuid:1d310e88-7769-479b-8885-27092c8a0167> | 3.40625 | 187 | Truncated | Science & Tech. | 48.630156 |
I am mostly interested in this article, describing what cuttlefish are. I find it very cool that the flamboyant cuttlefish can change colors, and how the lines move on the cuttlefish body. Most people say that they are the most advanced vertebrate found. Even though they are closely related to slugs, they have much bet... | <urn:uuid:b35b0915-b8f0-4dba-88f6-995be4f6639b> | 2.8125 | 193 | Personal Blog | Science & Tech. | 45.226091 |
|Jmol-3D images||Image 1|
|Molar mass||182.22 g mol−1|
48.5 °C, 322 K, 119 °F ()
305.4 °C, 579 K, 582 °F ()
|Solubility in water||Insoluble|
|Solubility in organic solvents||1 g/ 7.5 mL in ethanol
1 g/ 6 mL in diethyl ether
|MSDS||External MSDS by JT Baker|
|Main hazards||Harmful (XN)|
| (what is: / ?)
Except where not... | <urn:uuid:5e2cf9be-0633-4be9-8ac6-8963e3d22bd6> | 3 | 1,040 | Knowledge Article | Science & Tech. | 51.452724 |
DistributionRead full entry
Range DescriptionSouth American Sea Lions are widely-distributed, occurring more or less continuously from northern Peru south to Cape Horn, and north up the east coast of the continent to southern Brazil. They also occur in the Falkland/Malvinas Islands. The northernmost breeding distributi... | <urn:uuid:11dcfeda-65af-44ac-8de5-71329bd47530> | 3.0625 | 193 | Knowledge Article | Science & Tech. | 39.813929 |
Guides to (mostly) Harmless Hacking
Volume 5 Number 5:
Amit Rawat's Guides to Kernel Hacking, #3: Memory Management
Each process has its own private address space. The address space is initially divided into three logical segments: text, data, and stack. The text segment is read-only and contains the machine instructio... | <urn:uuid:79850321-f243-489d-b9cc-61d0b746cd3c> | 3.484375 | 2,576 | Documentation | Software Dev. | 41.938707 |
Griffiths, R.A. and Dewijer, P. and Brady, L. (1993) The effect of ph on embryonic and larval development in smooth and palmate newts, Triturus-Vulgaris and T-Helveticus. Journal of Zoology, 230 . pp. 401-409. ISSN 0952-8369.
|The full text of this publication is not available from this repository. (Contact us about th... | <urn:uuid:cc12eb9b-7852-4e4e-ab7d-8b2a1f62c2be> | 2.75 | 442 | Academic Writing | Science & Tech. | 45.726044 |
Researchers say bubble fusion
more difficult to reproduce than once thought
By Charles Choi
United Press International
July 24, 2002
CHAMPAIGN-URBANA, Ill. - Although sound
waves can generate temperatures as hot as the surface of the sun simply by
squishing bubbles, the potential of tabletop nuclear "bubble fusion" rai... | <urn:uuid:91fab116-3dc8-4cf9-bef2-c0c422039b34> | 3.171875 | 897 | Truncated | Science & Tech. | 21.20777 |
A talk by Doug Given, US Geological Survey Earthquake Early Warning Coordinator
Millions of Japanese citizens received warning of the 2011 magnitude 9.0 Tohoku earthquake. Can such a system be built for use in California?
University researchers and government agencies are working together to create an Earthquake Early ... | <urn:uuid:9df17a14-0ae8-4c6e-b80e-00762f8fd5e0> | 3.125 | 87 | Audio Transcript | Science & Tech. | 29.178 |
The Savannah River Site is an 803-km2 Department of Energy (DOE) facility located on the Upper Coastal Plain of South Carolina, near Aiken, SC. The site is bordered on one side by the Savannah River. Approximately 10% of the site is developed for DOE industrial activities; the remaining 720 km2 is primarily forested.
T... | <urn:uuid:3b927495-f678-4d16-8593-5eac97c4e216> | 3.03125 | 396 | Knowledge Article | Science & Tech. | 25.760319 |
Today, a silent arrival. The University of Houston's College of Engineering
presents this series about the machines that make our civilization
run, and the people whose ingenuity created them.
Today's New York Times Science section had
yet another article on energy being taken from wave motion. We've heard a lot
about ... | <urn:uuid:398024a9-311d-467c-a602-1e496316aa0f> | 3.140625 | 757 | Personal Blog | Science & Tech. | 47.587575 |
the Physics Central
the American Physical Society
Find out how scanning tunneling microscopes can be used to see atoms, which are too small to see with optical instruments. This same microscope can actually move atoms and locate them precisely on a surface--check out this site to see a circle of atoms and the electron ... | <urn:uuid:5dff253e-54e6-4883-aaf7-52701381a22b> | 2.9375 | 171 | Truncated | Science & Tech. | 42.909985 |