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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Tundra is the global biome that consists of the treeless regions in the north (Arctic tundra) and high mountains (alpine tundra). The vegetation of tundra is low growing, and consists mainly of sedges, grasses, dwarf shrubs, wildflowers, mosses, and lichens. The word "tundra" is derived from the Finnish word "tunturi,"... | <urn:uuid:8e06b7ad-c5e6-40ab-a4dc-e267a9bf048a> | 4.1875 | 471 | Knowledge Article | Science & Tech. | 44.310217 |
|Main Problem: Where is the start address of the
buffer? This must be known in advance to overwrite the
copy of %i7 accordingly.
|Minimal variations (different C compiler, different
compilation options, different libraries, different
release of the operating system) cause this address
|The nop operations (no operation)... | <urn:uuid:cfed7016-3614-4aae-9f0b-efc7b569169d> | 3.125 | 233 | Documentation | Software Dev. | 41.999596 |
Netlink is a flexible, robust, wire-format communications channel typically used for kernel to user communication although it can also be used for user to user and kernel to kernel communications. Netlink communication channels are associated with families or "busses", where each bus deals with a specific service; for ... | <urn:uuid:70ba92bb-0571-4c5e-9b2c-f89e6d4ecefa> | 2.859375 | 224 | Knowledge Article | Software Dev. | 25.221509 |
Magnetic Free Fall
There are two cylindrical slugs of metal were allowed to free-fall down a
hollow vertical tube made of copper. One of the slugs, a magnet, took
significantly longer to fall through the tube than the other.
The moving magnetic field induces an electric current in the surrounding
conductor, and the mag... | <urn:uuid:90cece96-8f3b-495d-9ae5-2243babd5d32> | 3.890625 | 235 | Q&A Forum | Science & Tech. | 45.001703 |
Laser cooling of neutral atoms
The past year has seen major advances and surprises in laser cooling of neutral atoms in optical molasses— an arrangement of counterpropagating laser beams that strongly damps the motion of atoms. For atoms at rest in equal intensity, oppositely propagating laser beams, the total force is... | <urn:uuid:6f0aac18-fe2f-4336-80ba-4e53b0429204> | 3.046875 | 231 | Truncated | Science & Tech. | 38.018224 |
|May29-09, 10:14 PM||#1|
Torque on Baseball going through pitching machine
1. The problem statement, all variables and given/known data
I am designing a shaft for a pitching machine that uses a spinning tire to accelerate a ball and must determine the torque acting on the shaft when a ball goes through the machine. A 1... | <urn:uuid:b461929b-d6d8-40ad-9ff5-d803ac86bfb9> | 3 | 387 | Comment Section | Science & Tech. | 63.250668 |
Alternative Energy Nuclear
Nuclear energy is the electricity which is generated by turbines which uses the steam created by the heat produced by the uranium atoms through fission. Fission is basically the breaking up of unstable nuclei into a smaller and more stable nuclei. The sun’s energy is generated by nuclear fusi... | <urn:uuid:1d554673-bf19-41b1-8ec3-f78ceb9b5ee5> | 3.109375 | 655 | Knowledge Article | Science & Tech. | 49.761903 |
I wrote earlier about my trek to the northeastern corner of California to attend the Golden State Star Party. My objective was to photograph a galaxy, and after checking out the pristine skies during my first night of observing, I selected my targets: M81 and M82, a close-by pair of galaxies in Ursa Major (the Big Dipp... | <urn:uuid:05d83b86-8638-4b79-bc24-f773a3fdab54> | 2.765625 | 716 | Personal Blog | Science & Tech. | 39.416304 |
July 7, 2009 The goal of DNA barcoding is to find a simple, cheap, and rapid DNA assay that can be converted to a readily accessible technical skill that bypasses the need to rely on highly trained taxonomic specialists for identifications of the world's biota. This is driven by a desire to open taxonomic identificatio... | <urn:uuid:a43ef6ef-5806-47a7-8a5d-2f2a12913b8c> | 3.359375 | 898 | Truncated | Science & Tech. | 32.929685 |
A day at the beach is a wonderful way to spend time with your family and friends. You can swim, play games and build sand castles. But have you ever wondered how the beach you are standing on came to be? How, for example, did all of that sand get there? Beaches are formed and continually changed by the ocean's waves mo... | <urn:uuid:41e74442-2071-42a5-9706-a43aa4c9fd76> | 4.21875 | 919 | Tutorial | Science & Tech. | 62.333572 |
Following some discussion in last year's tutorials I found the following formula for Bayes' theorem.
The formula states that given that the event B has occurred, the probability that it was due to cause Ai,
In other words, the posterior probability of event Ai given that B has occured, is the joint probability of event... | <urn:uuid:7c71fb78-e661-4315-b025-f7ed9858132a> | 2.796875 | 185 | Personal Blog | Science & Tech. | 43.445671 |
A University of Rochester study shows that baboons are able to understand numbers. Experimenters showed the monkeys peanut-filled cups and the monkeys then chose which cup contained more peanuts. Read more about the experiment and its conclusions...
Mammoth Cave in Kentucky is the largest cave in the world, with more t... | <urn:uuid:c50e040a-a4f7-4d0e-830d-6290a5997a82> | 3.09375 | 255 | Content Listing | Science & Tech. | 47.678839 |
Further informationIs water blue?Water does absorb a tiny amount of light, but in small amounts, we don’t notice it. Water actually absorbs light that has a reddish color. When there’s a lot of water – like a whole lake full – we notice that red light from the Sun has actually been absorbed. So what color do we see whe... | <urn:uuid:801dfc23-faf8-43f2-85da-de64c4277380> | 3.1875 | 353 | Knowledge Article | Science & Tech. | 78.301389 |
This is an image of a mercury bulb thermometer. The temperature is measured by reading the number next to the thin black line that goes partly up the yellow tube.
Click on image for full size
Image courtesy of Wikipedia Creative Commons
Thermometers measure temperature. "Thermo" means heat and "meter" means to measure.... | <urn:uuid:fbf0ed96-5b36-4dd8-be59-c8481d7037fd> | 4.0625 | 650 | Knowledge Article | Science & Tech. | 45.068383 |
Seasonal to Interannual Forecasts
March 2005 archive copy
On This Page
For More Information
The Climate Impacts Group (CIG) translates global-scale climate forecasts and conditions into regional-scale climate forecasts for Pacific Northwest (PNW) resource managers and the general public. The El Niño/Southern Oscillatio... | <urn:uuid:5e1354f5-e4f7-4a8e-9a87-30dda5622ea0> | 2.84375 | 1,889 | Knowledge Article | Science & Tech. | 30.417413 |
Introducing parallel programming
Introducing .net parallel programming
This is about the parallel programming features of .NET 4, specifically the Task Parallel Library (TPL), Parallel LINQ, and the legion of support classes that make writing parallel programs with C# simpler and easier than ever before.
With the wides... | <urn:uuid:c2a33a2e-4dcb-4970-92e4-9b3aa6cf3c4e> | 2.75 | 452 | Tutorial | Software Dev. | 52.106843 |
You can define an inline function by using
defun. An inline function works just like an ordinary
function except for one thing: when you compile a call to the function,
the function's definition is open-coded into the caller.
Making a function inline makes explicit calls run faster. But it also has disadvantages. For o... | <urn:uuid:dde06310-3356-4181-910d-28f89127b460> | 3.171875 | 388 | Documentation | Software Dev. | 36.131661 |
See also the
Browse High School Calculus
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Maximizing the volume of a box.
Maximizing the volume of a cylinder.
Volume of a tank.
What is a derivative?
- Inverse of a Multivariate Function [05/30/2002]
... | <urn:uuid:8ac51e9c-5c6c-45ff-ae38-f4c3cd6d48d5> | 2.9375 | 1,897 | Q&A Forum | Science & Tech. | 87.64855 |
i have always thought was defined as , where is the principal square root. Now I heard that you can't take the square root of negative numbers. That makes me confused.
How do you solve this equation for example:
Do you have to specify that the solution can be complex as well? Is it okay then to take the square root of ... | <urn:uuid:dd0f6fef-43d1-4f5b-bf91-d9ee60e0c19e> | 2.75 | 128 | Q&A Forum | Science & Tech. | 68.059246 |
Let me try yet one more type of explanation, which I will confine to the PN junction diode (covers virtually all diodes used in modern circuits).
The diode consists of a p-doped region (p-type) slapped up against an n-doped region (n-type). In the p-type, the electron (e-) flow is largely accomplished by electrons movi... | <urn:uuid:f0a0b5d9-0d05-44b6-9231-20718b3f42a3> | 2.953125 | 497 | Q&A Forum | Science & Tech. | 55.132778 |
The mass of asteroid (21) Lutetia
Measurements obtained during the 10 July 2010 Rosetta flyby of asteroid (21) Lutetia enabled Rosetta scientists to determine the mass of Lutetia with greater precision than ever before. The mass estimate of 1.7 x 1018 kg turned out to be much lower than expected from ground-based obser... | <urn:uuid:43ec1246-f844-424d-b844-84bfb4459e9a> | 2.6875 | 105 | Knowledge Article | Science & Tech. | 56.424219 |
Trace gases and aerosols are major factors influencing the climate. With the help of highly complex installations, such as MIPAS on board of the ENVISAT satellite, researchers try to better understand the processes in the upper atmosphere. Now, scientists have completed a comprehensive overview of sulfur dioxide measur... | <urn:uuid:ae32bb21-4b21-41cf-a864-1e2942f956cf> | 3.078125 | 127 | Content Listing | Science & Tech. | 26.650055 |
The Signum Representation
I’ve just noticed that there’s a very important representation I haven’t mentioned. Well, actually, I mentioned it in passing while talking about Rubik’s group, but not very explicitly. And it’s a very important one.
Way back when I defined permutation groups I talked about a permutation being... | <urn:uuid:32196dce-b57f-46b7-8f0f-dc6523f622a1> | 2.8125 | 494 | Personal Blog | Science & Tech. | 44.75346 |
Science Fair Project Encyclopedia
The Myxozoa are a group of microscopic, parasitic animals. Originally they were considered protozoa, and included with other non-motile forms in the group Sporozoa. However, as their distinct nature became clear they were removed to their own phylum. They are now generally considered t... | <urn:uuid:306f6b4d-eace-4186-875b-9d315bf40a26> | 3.484375 | 497 | Knowledge Article | Science & Tech. | 22.592044 |
June 26, 2004
Arable lands constitute a 13.5% of the continental surface.
Permanent arable lands constitute a 4% of the world’s surface.
One third of the continental surface is bein deprived of the fertile layer of soil.
Since 1490 until now, more than 4 billion hectares of fertile soil have been destroyed by climate v... | <urn:uuid:e68234a4-8a16-470f-be28-f98ea1e19bac> | 3.703125 | 2,030 | Knowledge Article | Science & Tech. | 40.008656 |
The team used Fe3O4 nanoparticles to produce a diverse range of propargylamines at moderate to high yields. These compounds can serve as building blocks and skeletons of biologically active compounds, the researchers note.
The Fe3O4 nanoparticles were magnetically separated (Figure 1), washed with ethyl acetate, air dr... | <urn:uuid:319170d5-050b-400f-8b6a-ce6b0ed71db7> | 2.796875 | 122 | Truncated | Science & Tech. | 20.305 |
Taye, M.T. and Willems, P. 2012. Temporal variability of hydroclimatic extremes in the Blue Nile basin. Water Resources Research 48: 10.1029/2011WR011466.
The authors write that the upper Blue Nile basin is one of the most important river basins in Africa, because "it contributes about 60% of the Nile's flow at Aswan, ... | <urn:uuid:c298b494-ebfd-453d-9964-3fd27eac006b> | 3 | 637 | Knowledge Article | Science & Tech. | 56.201414 |
g_assert() is used for debugging. It's typically used in areas where an expression SHOULD evaluate to true, and if it's not, then it throws out an error to the console. So, if you see this:
g_assert (value == NULL)
Then the developer is expecting "value == NULL" to be a true expression. If value is not null, then an er... | <urn:uuid:889f8cd9-a545-47c8-996a-498497a7bfce> | 3.34375 | 493 | Comment Section | Software Dev. | 67.4355 |
Where's Tyche, the 10th 9th planet? Getting the full story.
John Matese and Daniel Whitmire of the University of Louisiana at Lafayette recently made the news when they announced the possible discovery of a gas giant planet they named Tyche
in the Oort Cloud, at the extreme edge of the Solar System (previously
). Now a... | <urn:uuid:4954e497-7069-4dbb-a6e6-9ca56bc17810> | 2.921875 | 1,043 | Comment Section | Science & Tech. | 51.633871 |
A rational function f(t) with coefficients in a field K is a fraction g(t)/h(t) where f(t), g(t) are in K[t].
a fraction whose numerator and denominator are both polynomials in X
a function formed by taking the ratio of two polynomials
a function that is expressed as the ratio of two polynomials
a function that looks l... | <urn:uuid:a2fc91ee-4638-4cff-b61e-32eb7f71e834> | 3.40625 | 209 | Structured Data | Science & Tech. | 51.023529 |
The Indexed Sequential Access Method, or ISAM , is a technique for organizing data and efficiently retrieving it. It is designed for efficient operation in two modes: random access and sequential access; hence the name Indexed Sequential Access Method.
The ISAM is implemented as a C function library. The purpose of the... | <urn:uuid:24869e18-4e5a-4d19-8168-52417a8bc7c0> | 3.875 | 2,035 | Documentation | Software Dev. | 48.738887 |
A collection is an object whose primary function is to store a number of like objects. An object called CarCollection may contain any number of Car objects. Collections can traditionally be accessed in the same manner as arrays, which means CarCollection[n] represents a particular Car object. This is true in C#, Java, ... | <urn:uuid:6cae00ca-d4ed-4299-96ea-72198473d2eb> | 2.90625 | 176 | Knowledge Article | Software Dev. | 45.152095 |
This image of irrigated agriculture in the deserts of central Saudi Arabia, 450 km west of Riyadh, was taken by the Landsat 7 satellite on February 5, 2000, while orbiting 700 km above the surface of the Earth at a speed of roughly 26,000 km/h. The Saudis manage to make the desert bloom by pumping fossil water from dee... | <urn:uuid:653293a5-1494-4a0e-b7f5-6af5ea497a8a> | 3.703125 | 388 | Knowledge Article | Science & Tech. | 34.06476 |
The alligator snapping turtle (Macrochelys temminckii) is one of the largest freshwater turtles in the world. It is not closely related to, but is often associated with, the common snapping turtle. The alligator snapping turtle is characterized by a large, heavy head, and a long, thick shell with three dorsal ridges of... | <urn:uuid:e17a8717-ae35-4662-b8fd-bb92f209b84c> | 3.109375 | 139 | Knowledge Article | Science & Tech. | 32.24359 |
Carbon-14 is present in all living things. When a living thing dies, the amount of isotope at that time starts to decay.
The function for radioactive decay is R(t)=R0(1/2)t/h, where R is the radioactivity/gram of carbon-14 at time t after death, R0 is the radioactivity/gram of carbon at the time of death, and h is the ... | <urn:uuid:06955cd6-93a1-479f-80cd-4bbb34109123> | 2.734375 | 159 | Q&A Forum | Science & Tech. | 82.919423 |
melted stone from Waidhofen/Thaya TV-Report in "Österreich Bild" ORF 28.8.2007
reference: Elisabeth Widensky
Ball lightning is an atmospheric phenomenon, the physical nature of which is still controversial. The term refers to reports of a luminous object which varies in size from golf ball to several meters in diameter... | <urn:uuid:c1b8e60a-af3d-4d0c-bdbd-fa36708157fa> | 3.109375 | 1,021 | Knowledge Article | Science & Tech. | 39.546824 |
Santa Barbara Field Guides - Butterflies|
wingspread 1.5-1.75 in.|
Recognition: Small; female is off-white with black FW tips and adjacent spot on leading edge of FW; male has same markings as the female but more yellow-toned, and also has pattern of patchy brownish yellow stripes on HW.
Flight period: The adults are a... | <urn:uuid:0009cd1e-5d69-4cd4-814b-0fdd672c2762> | 2.75 | 225 | Knowledge Article | Science & Tech. | 54.623811 |
Not far from milepost 200 on a stretch of the Pacific Coast Highway near the Oregon Dunes National Recreation Area is a humble water hole known in some biology circles as Slimy Log Pond. It was from this inauspicious pool that a water flea (Daphnia pulex) dubbed The Chosen One was plucked in 2000, and became the first ... | <urn:uuid:72425c06-f01e-4c68-b754-3279d27ecbe1> | 3.6875 | 1,021 | Knowledge Article | Science & Tech. | 33.606727 |
Phascinating PhysicsThis page contains answers to questions that have to do with physics. They explore time, the speed of light, the universal forces and much more! Click on a topic to see our "Quickie" questions archive or scroll down for more in-depth answers.
Quickie Phascinating Physics
|Particle Physics||(15 quest... | <urn:uuid:3966cd3d-58af-4d96-b1f5-a50b938ddc2a> | 3.203125 | 364 | Q&A Forum | Science & Tech. | 75.881758 |
This colorful supernova remnant is called W49B, and inside it astronomers think they may have found the Milky Way’s youngest black hole. It’s only 1,000 years old, as seen from Earth, and 26,000 lightyears away.
From a vantage point on NASA’s Chandra X-ray Observatory, astronomers observed and measured the remnant and ... | <urn:uuid:de9ed0f3-8cee-4566-b38c-7e4bcbe40f91> | 3.828125 | 642 | Content Listing | Science & Tech. | 45.382146 |
Balancing Chemical Equations
We have now determined symbols and formulas for all the ingredients of chemical equations, but one important step remains. We must be sure that the law of conservation of massA measure of the force required to impart unit acceleration to an object; mass is proportional to chemical amount, w... | <urn:uuid:19e73aac-9831-4271-906d-2f943f0981d1> | 4.59375 | 2,275 | Tutorial | Science & Tech. | 47.07357 |
The Who, What, When, Where and Why of Chemistry
Chemistry is not a world unto itself. It is woven firmly into the fabric of the rest of the world, and various fields, from literature to archeology, thread their way through the chemist's text.
Stephen Davey, associate editor for Nature Chemistry, blogged at the Sceptica... | <urn:uuid:08406da4-416f-479f-8f77-4b0e26ebe4d2> | 3.25 | 549 | Personal Blog | Science & Tech. | 49.786346 |
The data are 3He exposure ages from lateral moraine bands on Mount Waesche, a volcanic nunatak in Marie Byrd Land, West Antarctica. The proximal part of the moraine is up to 45 meters above the present ice level was deposited approximately 10,000 years ago, well after the glacial maximum in the Ross Embayment. The uppe... | <urn:uuid:a1d4bea3-3924-4330-9c23-2983285fd5bc> | 2.96875 | 151 | Knowledge Article | Science & Tech. | 45.654578 |
From MicrobeWiki, the student-edited microbiology resource
Higher order taxa
Domain (Bacteria); Phylum (Actinobacteria); Class (Actinobacteria); Order (Actinomycetales); Suborder (Catenulisporineae); Family (Catenulisporaceae); Genus (Catenulispora)
Description and significance
The Actinobacteria phylum is known to inc... | <urn:uuid:a1e9ee0a-e412-4395-a340-8fbe37fd272d> | 3.234375 | 1,133 | Knowledge Article | Science & Tech. | 40.955064 |
An active object framework
is a callback
-based form of multitasking
for computer systems. Specifically, it is a form of cooperative multitasking
and is an important feature of the Symbian
Within the framework, active objects
may make requests of asynchronous
services (e.g. sending an SMS
message). When an asynchronous... | <urn:uuid:935b9938-5c1d-461c-a26b-f084d8e5cb67> | 3.109375 | 302 | Knowledge Article | Software Dev. | 47.31 |
Constructor Overloading In this article we will combine two techniques to allow a number of constructors to be defined for a single class. This gives the class the flexibility to construct objects in a variety of ways according to the manner in which they are to be used. Creating Overloaded Constructors Creating an ove... | <urn:uuid:bc66e6f3-5122-4632-bce7-adb004f9194d> | 2.828125 | 122 | Truncated | Software Dev. | 35.301429 |
April 16, 2010
The very first exercise at Programming Praxis evaluated expressions given in reverse-polish notation. In today’s exercise, we write a function to evaluate expressions given as strings in the normal infix notation; for instance, given the string “12 * (34 + 56)”, the function returns the number 1080. We d... | <urn:uuid:e2e4cd22-6e19-4742-a81f-7c644960cfb5> | 3.65625 | 346 | Tutorial | Software Dev. | 30.871613 |
Our analysis points to a primarily natural cause for the Russian heat wave. This event appears to be mainly due to internal atmospheric dynamical processes that produced and maintained an intense and long-lived blocking event. Results from prior studies suggest that it is likely that the intensity of the heat wave was ... | <urn:uuid:b1fd5ffa-19fb-45eb-9627-13c5df417b35> | 3.09375 | 246 | Personal Blog | Science & Tech. | 22.228204 |
In mathematics, you don’t understand things. You just get used to them. -Johann von Neumann
Sometimes, I have to deal with series: lots of numbers all added together. Some series clearly approach a limit, like the following:
1 + 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + …
I can visualize this in terms of pies. (What do you want?... | <urn:uuid:9cec421c-b3ab-4786-81cd-60e73a452436> | 2.921875 | 1,036 | Personal Blog | Science & Tech. | 88.819815 |
What is Renewable Energy?
Our country currently relies heavily on fossil fuels, such as coal, oil, and natural gas for its energy. These fossil fuels are nonrenewable, that is, they will eventually run out, becoming too expensive or too environmentally damaging to develop. Contrastingly, renewable energy resources—like... | <urn:uuid:259880cc-dbf4-4ff1-a431-349717409743> | 3.828125 | 568 | Knowledge Article | Science & Tech. | 28.277634 |
Science Fair Project Encyclopedia
| style="text-align:center;" |
Harbour Porpoise range The Harbour Porpoise (Phocoena phocoena) is one of six species of porpoise, and so one of about eighty cetacean species. The Harbour Porpoise, as its name implies, stays close to coastal areas or river estuaries and as such is the m... | <urn:uuid:4986fb50-0b3c-4139-83f5-9fd09429a75c> | 3.640625 | 680 | Knowledge Article | Science & Tech. | 48.68348 |
La Niña events greatly influence Australia’s climate.
The 2010–11 and 2011–12 La Niña events were two of the most significant in Australia’s recorded meteorological history.
The following pages explore the ‘story’ and ‘background’ of these La Niña events. The ‘story’ section follows the evolution of these extraordinary... | <urn:uuid:971c4fd6-16a2-4742-b5ef-4b2ec35abfb0> | 3.53125 | 497 | Knowledge Article | Science & Tech. | 49.616579 |
Carbon dioxide (CO2) is a chemical molecule consisting of one carbon atom covalently bonded to two oxygen atoms. At atmospheric pressure and temperature, carbon doixode is a colorless, odorless gas that exists naturally as a trace gas in the Earth's atmosphere. It is a fundamental component of the Earth's carbon cycle,... | <urn:uuid:6d9ffe77-05d7-410c-8782-2e57d322d59e> | 3.875 | 1,275 | Knowledge Article | Science & Tech. | 41.67117 |
The International Astronautical Congress is in full swing in Prague today, with regular updates flowing over #IAC2010 on Twitter and the first session of interstellar import now in progress as I write this. It’s a session on interstellar precursor missions that includes, in addition to Ralph McNutt (JHU/APL) on the imp... | <urn:uuid:a756587a-4833-4798-8d53-a2ff5b459748> | 2.859375 | 1,133 | Personal Blog | Science & Tech. | 35.598614 |
William Henry Perkin
A photograph that William Henry Perkin took of himself at the age of 14—four years before he discovered the first synthetic dyestuff. CHF Collections.
In 1856, during Easter vacation from London’s Royal College of Chemistry, 18-year-old William Henry Perkin (1838–1907) synthesized mauve, or aniline... | <urn:uuid:c27f0459-5053-46a6-a0b5-067e32bb83f7> | 3.359375 | 375 | Knowledge Article | Science & Tech. | 29.025495 |
This site contains 25 questions on the topic of plate tectonics, which covers the development of the theory, crustal movements, geologic features associated with tectonics, and plate boundaries (convergent, divergent, transform). This is part of the Principles of Earth Science course at the University of South Dakota. ... | <urn:uuid:7b2c6690-49b8-4470-a9c0-82875eac4363> | 3 | 171 | Content Listing | Science & Tech. | 22.109414 |
Converting to String
String class provides us with the method String.valueOf(some stuff) that basically converts "some stuff" into a string..
But we can also concatenate "some stuff" with an empty String ("").
Both these methods result in a String representation of an object(or other data type) so my question is what i... | <urn:uuid:125603ae-4029-47a4-9c6a-ac466f59ced6> | 2.859375 | 189 | Q&A Forum | Software Dev. | 56.506091 |
US usage, definition 1: A quadrilateral which has a pair of opposite
sides which are parallel. The parallel sides are called the bases,
and the other two sides are called the legs.
US usage, definition 2: A quadrilateral which has one parallel pair of opposite sides and one non-parallel pair of opposite sides. The para... | <urn:uuid:49efa30f-0e13-4411-9f52-666331e348ce> | 3.78125 | 213 | Knowledge Article | Science & Tech. | 37.170952 |
is a very large ciliate measuring from 500-2000 microns long when
extended. There are a variety of species of Stentor.
coeruleus is a very large trumpet shaped, blue to blue-green ciliate
with a macronucleus that looks like a string of beads (dark connected dots
on the left). With many myonemes, it can contract into a ... | <urn:uuid:88e17127-6ef4-4f46-9866-2cfe2faedbb8> | 2.890625 | 241 | Knowledge Article | Science & Tech. | 50.62878 |
co-leader of the new DOE Center for Research on Enhancing Carbon
Sequestration in Terrestrial Ecosystems (CSITE), Gary Jacobs of
ORNL's Environmental Sciences Division (ESD) explains some of the
concepts that the center's 28 scientists are studying and some of
the questions they seek to answer.
Vegetation and Soil:
Nat... | <urn:uuid:b83112ba-fb84-4b7c-b9b5-0b2dd8d091b1> | 3.875 | 2,402 | Audio Transcript | Science & Tech. | 24.645075 |
A new research paper
(PDF format) suggests that astrobiologists and geologists should work in
a virtual world that extends their senses rather than using traditional
approaches. The paper presents the argument using the Matrix films as an
analogy. As an example, they offer the idea of a human with ViA wearable
computer... | <urn:uuid:3982dafc-ea84-483f-8f25-4485d19d5323> | 2.6875 | 325 | Comment Section | Science & Tech. | 57.316929 |
These procedures are in structures
(make-time integer) -> time
(current-time) -> time
(time? x) -> boolean
(time-seconds time) -> integer
timerecord contains an integer that represents time as the number of second since the Unix epoch (00:00:00 GMT, January 1, 1970).
make-time's using its argument while
current-time's ... | <urn:uuid:480099e6-6199-46a7-b3b4-a05e0201b228> | 3.28125 | 195 | Documentation | Software Dev. | 49.079757 |
Hardness and specific gravity are two of the major characteristics of rocks. Hardness of a rock or minneral is its resistance to scratching and may be described relative to a standard scale of 10 minerals known as the Mohs scale. F. Mohs, an Austrian mineralogist, developed this scale in 1822.
Specific gravity is the n... | <urn:uuid:d072aa65-14b9-4720-a3bd-85b8f3836cd7> | 3.8125 | 160 | Knowledge Article | Science & Tech. | 48.201585 |
Sea Fan Corals
- This species of coral is of the “gorgonian soft coral family”, hence they are commonly known as the “Sea Fan”. They have a flower like appearance as they grow colonially flat fan like pattern. All species grow about 2 feet high and the colonies may grow up to 5 feet tall. This coral has a flexible stru... | <urn:uuid:65369870-d7fa-405f-af56-b4ef11eeb154> | 3.234375 | 711 | Knowledge Article | Science & Tech. | 53.457563 |
These images show two Jupiter-sized sunspot groups on the face of the Sun (left) and an extreme close-up of a different, smaller sunspot group (right). The lefthand image was taken on Oct. 24, 2003 by the SOHO (Solar & Heliospheric Observatory) spacecraft. The righthand image was taken on July 15, 2002 by the Swedish 1... | <urn:uuid:1c0943b4-6122-4dfb-a2da-d15817f8d32b> | 2.9375 | 156 | Knowledge Article | Science & Tech. | 65.511261 |
Technical Summary for Mathematicians
This is an introduction to finite fields, rings, and groups, with applications to modern cryptography.
The examples used here are all ultimately derived from Z/nZ, by means of constructions like products, field extensions, and groups of invertibles.
The RSA cryptosystem, probably th... | <urn:uuid:2e95c3d0-d803-4fa0-8307-c94271682cda> | 3.046875 | 258 | Knowledge Article | Science & Tech. | 39.603304 |
Since no one else did, here is the explanation of uranium series,
electron spin resonance and optically stimulated luminescence.
Uranium series dating dates the uranium and thorium which is
incorporated into travertine (cave limestone) deposits. Ground water,
seeping into caves, contains uranium 238 and 234, which are ... | <urn:uuid:6c66cdb2-a91b-4e29-b80f-9fb8f0a956f1> | 3.828125 | 574 | Knowledge Article | Science & Tech. | 47.615145 |
A molecular sieve is a material with very small holes of precise and uniform size. These holes are small enough to block large molecules and allow small molecules to pass. Many molecular sieves are used as desiccants. Examples: Activated charcoal and silica gels are molecular sieves.
According to IUPAC notation,micropo... | <urn:uuid:8a34d557-1b83-4467-b723-dac66a556bd1> | 4.09375 | 1,864 | Knowledge Article | Science & Tech. | 49.765983 |
Global warming is increasingly rendering Inuit and other Arctic peoples at a loss for words. They simply do not have names in their languages for the temperate species flocking up from the south.
They have plenty of ways of describing their own wildlife - some have more than 1,000 words for reindeer - but none for, say... | <urn:uuid:1db999c5-491b-451a-871a-ff303516375b> | 3.015625 | 547 | Comment Section | Science & Tech. | 39.312279 |
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.
- Area of an Octagon [10/26/2001]
I am trying to figure out the squar... | <urn:uuid:4da58a0c-e987-4403-9dc3-a73d7789a627> | 3.328125 | 1,664 | Q&A Forum | Science & Tech. | 69.396646 |
I wish just to present the problem and then muse on its educational significance both for my personal learning of mathematics, and for that of my students.
N is the 4-digit integer 6_9_. If these two digits are reversed, explain why the resulting number must be 2970 more?
(posted by @dmarain to @cuttheknotmath)
I immed... | <urn:uuid:c22cd389-ed16-4e17-bc0e-874256cb55f1> | 3.46875 | 538 | Personal Blog | Science & Tech. | 60.791467 |
Starting with the second session, there will be a brief quiz during each session. Each review quiz counts for 5% of the course grade.
In a house in Cambridge, the water from the faucet suddenly started showing some particulate matter, which is suspected to be copper from a pipe. It was brought to the MIT Reactor for an... | <urn:uuid:ee3d6991-9a57-4a9b-acc9-c46aed4d540d> | 3.765625 | 905 | Academic Writing | Science & Tech. | 73.167048 |
Electric current and magnetism
When two magnets are close together, magnetic
forces are at work. Two magnets repel or attract each
other. A wire carrying an electric current and a magnet
also repel or attract, because electric current makes a
solder wire, enameled wire, horseshoe magnet, battery, switch, conducting wir... | <urn:uuid:bfd79203-2f63-4f9e-a29d-255807aea70a> | 3.4375 | 93 | Knowledge Article | Science & Tech. | 33.705682 |
The Physics Philes, lesson 16: Appreciate the Gravity of the Situation
In which balls are thrown, gravity works, and energy is added.
Holy cow, you guys. This is the 16th post of this series and, frankly, I long ago ran out of clever ways to introduce each installment. (You may have noticed.) So I’m just going to jump ... | <urn:uuid:144eb709-1fbd-42a9-812a-273606ddce50> | 3.9375 | 1,115 | Personal Blog | Science & Tech. | 74.258697 |
|Breakthrough Research on Platinum–Nickel Alloys|
Two out of three of the kinetic barriers to the practical use of polymer electrolyte membrane (PEM) hydrogen fuel cells in automobiles have been breached: the impractically high amount of extra energy needed for the oxidation reduction reaction (ORR) on the catalyst and... | <urn:uuid:b7b238c4-ce6e-4acf-b528-e86adc73ed8d> | 2.703125 | 1,137 | Academic Writing | Science & Tech. | 41.413957 |
Science Fair Project Encyclopedia
Civil defense siren
A civil defense siren, air raid siren, or tornado siren is a electrically-powered mechanical device for generating sound to provide warning of approaching danger and to indicate when the danger has passed. Initially designed to warn of air raids they were adapted to... | <urn:uuid:7a803179-4e71-465f-b96f-3c7cae929281> | 3.609375 | 635 | Knowledge Article | Science & Tech. | 45.353991 |
Science Fair Project Encyclopedia
The Garnet group of minerals show crystals with a habit of dodecahedrons and trapezohedrons. They are nesosilicates with the same general formula, A3B2(SiO4)3. The chemical elements in garnet include calcium, magnesium, aluminium, iron2+, iron3+, chromium, manganese, and titanium. Garn... | <urn:uuid:6064674a-3b71-4ae7-8528-16e74c2c32cc> | 3.75 | 1,879 | Knowledge Article | Science & Tech. | 32.477286 |
Science Fair Project Encyclopedia
The Osmundaceae family of ferns is the only family of the order Osmundales, which in turn is the only order in the class Osmundopsida. This is an ancient and fairly isolated group, often known as the "flowering ferns" because of the striking aspect of their ripe sporangia. The sporangi... | <urn:uuid:5dbaf966-c857-4f70-b64e-a859cb33e25f> | 3.453125 | 236 | Knowledge Article | Science & Tech. | 43.987494 |
Since the early 80's, it has been discovered a massive dysfunction of reef organs. It affects not only corals, but also other algae's. Coral loses its colors, hence the common name "Bleaching".
The first described mass bleaching began in Bonaire in June 1979 and ended in February 1980. It occurred on the windward coast... | <urn:uuid:52460cbb-e7b1-407e-b600-0cd315dc6c49> | 3.953125 | 834 | Knowledge Article | Science & Tech. | 31.162143 |
The following examples show you how to use string literals. String literals are widely used to identify filenames or when messages are displayed to users. First, we'll look at single-quoted strings, then double-quoted strings.
A single-quoted string is pretty simple. Just surround the text that you'd like to use with s... | <urn:uuid:814da631-e911-43bb-94ab-da4bc2f6bda6> | 4.28125 | 378 | Documentation | Software Dev. | 59.833333 |
How a solar flare could send us back to the Stone Age
A powerful enough solar flare could knock out our power grids, disrupt our GPS satellites, and bring the global economy to a halt, warns a British scientists.
(Page 2 of 2)
The storms can also disrupt communications on transoceanic flights. Sometimes when that happe... | <urn:uuid:adfe378a-800d-4e61-81fc-c7e56c282e11> | 3.296875 | 914 | Audio Transcript | Science & Tech. | 69.761794 |
Let's have some time to think about that.
Tick, tock, tick, tock, tick, tock...
Large amounts of ozone -- around 50% more than predicted by the world's state-of-the-art climate models -- are being destroyed in the lower atmosphere over the tropical Atlantic Ocean. This startling discovery was made by a team of scientis... | <urn:uuid:c937c291-6a47-44ca-94cb-b64842f57efa> | 3.375 | 684 | Personal Blog | Science & Tech. | 29.353044 |
There are a couple of points to be made with our simple JSP. First the
shows the use of the
ApplicationResource file that we mentioned earlier. This frees you from hard-coding text into your application.
<html:errors/> is what uses the
ActionErrors collection that we created to return any errors that occurred during va... | <urn:uuid:b4888ed8-71cb-4e2b-98ed-88a0c2ab1e7f> | 2.921875 | 1,172 | Documentation | Software Dev. | 61.261043 |
Why we have a scientific consensus on climate change
Posted on 23 March 2011 by Thomas Stemler
A short piece for the general audience of RTR radio, Perth, Australia.
(listen to the original audio podcast)
Recently a research group analysed the current literature on climate science. Their aim was to find out how many of... | <urn:uuid:55cb24fb-2b28-4dd6-9370-cefc037b840d> | 3.25 | 606 | Personal Blog | Science & Tech. | 42.823571 |
Story : http://www.msnbc.msn.com/id/46486262/ns/technology_and_science-space/
Anyone out under the stars in the early evening lately likely cannot help but notice two brilliant objects dominating the western sky: the planets Venus and Jupiter.
Venus, because it is closer to the sun than Earth, never strays far from the... | <urn:uuid:b6eb7b1b-11d1-4320-bbda-093f75f78a4b> | 3.1875 | 226 | Comment Section | Science & Tech. | 67.162328 |
The following HTML text is provided to enhance online
readability. Many aspects of typography translate only awkwardly to HTML.
Please use the page image
as the authoritative form to ensure accuracy.
Surface Temperature Reconstructions for the last 2,000 Years
8000 B.C. Such recession has thus occurred in the past due ... | <urn:uuid:916d9549-ba5e-4bf3-b010-01df163ba94d> | 3.90625 | 345 | Knowledge Article | Science & Tech. | 46.701174 |
In one e-mail from 1999, the center's director, Phil Jones, alludes to one of Mann's articles in the journal Nature and writes, "I've just completed Mike's Nature trick of adding in the real temps to each series for the last 20 years (i.e., from 1981 onwards) and from 1961 for Keith's to hide the decline."
Mann said th... | <urn:uuid:aaa3e48c-4819-4c3d-aca6-b65c27fba699> | 2.75 | 354 | Personal Blog | Science & Tech. | 48.366705 |
In 1903 the word on the street was that Pierre and Marie Curie were the front-runners for the Nobel Prize in Physics for their work on radioactivity — inherent in which was the hypothesis that the atom was not the most basic particle but could emit subatomic particles. Some were affronted by the idea that a woman could... | <urn:uuid:73b94ed9-b33b-4f57-875f-1d09f0874d65> | 3.0625 | 683 | Personal Blog | Science & Tech. | 41.125928 |
over the rainbow!
The agitation of the charged particles that are present in all
matter causes all objects to emit electromagnetic radiation. The
objects emit this energy, but can also transmit, absorb, and reflect
it. The sun is one of the main natural sources of the electromagnetic
energy on Earth, but there are also... | <urn:uuid:ca020fe5-638b-4d9e-98f2-3dbf5c32f417> | 3.8125 | 872 | Knowledge Article | Science & Tech. | 43.331417 |
First. Lets write what do we know about each voxel :
voxel = (x, y, z, color) // or some other information
General way is simply this:
set of voxels = set of (x,y,z, color)
Note, that triplet (x,y,z) identify each voxel uniquely, since voxel is point in space and there is no way two points occupy one place (I believe w... | <urn:uuid:c860b347-39cc-49a8-9712-d57d5ff1d08a> | 2.828125 | 781 | Q&A Forum | Software Dev. | 64.916864 |
The mittenpunkt or middlespoint of a
triangle ABC is the point of concurrence of the lines from the
excenters D, E, F through the corresponding triangle side
midpoints G, H, N. The mittenpunkt of triangle ABC is the
symmedian point of the excentral triangle DEF. The point was
studied by Christian Heinrich von Nagel in ... | <urn:uuid:03c43a87-015c-4d0f-a928-37c027b440da> | 2.6875 | 88 | Knowledge Article | Science & Tech. | 68.541905 |
Writes a byte to the current position in the stream and advances the position within the stream by one byte.
Assembly: mscorlib (in mscorlib.dll)
For an example of creating a file and writing text to a file, see How to: Write Text to a File. For an example of reading text from a file, see How to: Read Text from a File.... | <urn:uuid:067f9f74-23d7-41d5-aa46-94cb4212bdfd> | 3.03125 | 302 | Documentation | Software Dev. | 51.865158 |
Argument Passing and Naming Conventions
All arguments are widened to 32 bits when they are passed. Return values are also widened to 32 bits and returned in the EAX register, except for 8-byte structures, which are returned in the EDX:EAX register pair. Larger structures are returned in the EAX register as pointers to ... | <urn:uuid:3dc725ce-dab8-42ff-8063-d3324dfee408> | 2.71875 | 319 | Documentation | Software Dev. | 38.571034 |
Methane gas hydrate forming below a rock overhang at the sea floor on the Blake Ridge diapir. This image, taken from the DSV Alvin during the NOAA-sponsored Deep East cruise in 2001, marked the first discovery of gas hydrate at the sea floor on the Blake Ridge. Methane bubbling out of the sea floor below this overhang ... | <urn:uuid:4b40bda0-c614-430a-8a8a-348c72fc02e1> | 3.390625 | 558 | Content Listing | Science & Tech. | 50.209789 |
|IODP publications Expeditions Apply to sail Sample requests Site survey data Search|
Subduction zones account for 90% of global seismic moment release, generating damaging earthquakes and tsunamis with potentially disastrous effects on heavily populated coastal areas (e.g., Lay et al., 2005). Understanding the process... | <urn:uuid:995fa049-9a50-4e0f-a1e0-a742bcbe056a> | 2.875 | 1,145 | Academic Writing | Science & Tech. | 35.577857 |
The smallest fish on record is no longer the 8mm Indo-Paciffic gobby, but rather a 7.9mm member of the carp family known as Paedocypris progenetica. Discovered in a peat bog on Sumatra island by Switzerland’s Maurice Kottelat and Singapore’s Tan Heok Hui, this fish is remarkable not only because it is so small, but bec... | <urn:uuid:8c6a180a-33dc-443b-8d3c-dcad2b84e450> | 3.171875 | 300 | Personal Blog | Science & Tech. | 41.551764 |
Birds have a lousy sense of smell, right? That common perception may apply to some modern-day birds, but that wasn’t always the case. Early birds, frankly, smelled like dinosaurs, meaning that they inherited a pretty respectable sense of smell from their dinosaurian kin. The typical scenario had been that as birds evol... | <urn:uuid:4cd22e89-eebf-43a5-acc1-f40d41322454> | 3.21875 | 1,396 | Personal Blog | Science & Tech. | 40.326064 |
In southern Vermont, researchers study the at-risk Bicknell’s Thrush
Bryan Pfeiffer / Wings Photography
It’s 3:30 a.m. on the summit of Stratton Mountain. The sun won’t rise for another two hours, but scientists from the Vermont Center for Ecostudies (VCE) have already begun their search for “the canary of the mountain... | <urn:uuid:37148477-b131-4d99-b826-eca7a4ba94b2> | 3.359375 | 2,545 | Truncated | Science & Tech. | 54.958469 |
Ask a question about 'Phase response'
Start a new discussion about 'Phase response'
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In signal processing
Signal processing is an area of systems engineering, electrical engineering and applied mathematics that deals with operations on or analysis of signals, in either discrete or conti... | <urn:uuid:b4c96fc1-a5e5-4606-a7b2-3dcb837db54c> | 3.328125 | 406 | Q&A Forum | Science & Tech. | 30.902455 |
methaneArticle Free Pass
methane, also called marsh gas, colourless, odourless gas that occurs abundantly in nature as the chief constituent of natural gas, as a component of firedamp in coal mines, and as a product of the anaerobic bacterial decomposition of vegetable matter under water (hence its alternate name, mars... | <urn:uuid:dcc9cf30-6ec8-4146-bbc9-bef06b6f1329> | 3.828125 | 522 | Knowledge Article | Science & Tech. | 37.295969 |