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Top White Papers
Collect User Input in a Bash Shell ScriptFeb 02, 2011, 12:04 (0 Talkback[s])
[ Thanks to Andrew Weber for this link. ]
"The read command is designed to read and then use in the script input from the user. The input that is provided by the user is stored as a variable. This is a builtin variable that wi... | <urn:uuid:6d66ee86-bcbf-4e69-bed7-b2fd38a23361> | 2.84375 | 171 | Content Listing | Software Dev. | 69.654585 |
The Deep Impact mission, which last year fired a massive projectile at the nucleus of comet Tempel 1, has inspired a proposal for a similar mission to Jupiter's moon Europa.
Evidence that Europa has a subsurface ocean, which would make it the only known "water world" besides Earth, emerged between 1996 and 2003 from NA... | <urn:uuid:6e5e569a-1328-450f-bd32-9dcc4f54b27a> | 4 | 201 | Truncated | Science & Tech. | 46.273269 |
When you think power, you probably DON’T think algae! But, believe it or not, algae—and its 50% oil content—is being considered as the next JET fuel. Experimentation is currently underway to convert the green sludge into renewable energy; Scientific America reports.
And this video shows how it’s being done. Via Nationa... | <urn:uuid:f3844918-ffa2-4868-b8b1-f80362b785d1> | 2.828125 | 141 | Personal Blog | Science & Tech. | 41.944706 |
Feb 18, 2013
For decades, the strange substance called dark matter has teased physicists, challenging conventional notions of the cosmos.
Today, though, scientists believe that with the help of multi-billion-dollar tools, they are closer than ever to piercing the mystery — and the first clues may be unveiled just weeks... | <urn:uuid:1775659a-624a-48c4-bdab-602d08facefa> | 3.15625 | 163 | Truncated | Science & Tech. | 33.66505 |
Making the Rounds
February 13, 2013
Early on Jan. 31, 2013, SDO observed a visual phenomena that most of us do not recall ever seeing before: a ring-shaped prominence that lay flat above the Sun's surface. Plasma streaming along the magnetic field lines appears to go in both directions at the same time along the field ... | <urn:uuid:23a47034-6edc-4011-a72d-d1d01d758848> | 3.375 | 135 | Truncated | Science & Tech. | 50.16 |
The 2010 Summer season has been extremely warm across the southeastern United States, with the State of Alabama experiencing one of the warmest summers on record. Statistics from this summer can be found here:
Central Alabama Summer Heat Statistics
NOAA Global Temperature Statistics
The Fall season officially begins at... | <urn:uuid:b2a78165-8a3b-4f9f-bedd-f136ec53f1fb> | 3.109375 | 195 | Knowledge Article | Science & Tech. | 39.46455 |
An unusual event playing out high in the atmosphere above the Arctic Circle is setting the stage for what could be weeks upon weeks of frigid cold across wide swaths of the U.S., having already helped to bring cold and snowy weather to parts of Europe.
This phenomenon, known as a “sudden stratospheric warming event,” s... | <urn:uuid:eb865a8e-2dd3-4cb3-b0b6-58ce302149bf> | 3.578125 | 596 | Truncated | Science & Tech. | 40.866 |
May 7, 2009
During the past decade, numerous discoveries have been made that have confirmed the hypothesis that birds evolved from dinosaurs. These fossils have given paleontologists important insight into how adaptations like feathers evolved, but one of the most hotly debated topics in paleobiology is how birds began... | <urn:uuid:4fd9d6c7-024f-4607-8c2a-c12c48a880f5> | 4.0625 | 452 | Personal Blog | Science & Tech. | 41.693814 |
What is in a plume?
CIOERT’s partner, UNCW has created a web page describing expected forms of oil, gas and chemical dispersants that may travel over Florida reefs.
How to detect a plume?
Oil and gas in the water takes many forms, from dissolved gases to large blobs (mousse) at the surface. Most mapping is done via sat... | <urn:uuid:278ed8be-5b27-46d1-b3db-baca297c1635> | 3.25 | 713 | Knowledge Article | Science & Tech. | 23.936794 |
In summer 1992, the south side of the Alaskan Peninsula and the
Kodiak Archipelago were surveyed for harbor porpoise (Phocoena phocoena) from
the NOAA John N. Cobb using line transect methodology. The shipboard platform
was 28.36 m (93 ft) in length with a bridge height of 4.27 m (14 ft). To obtain
data on seasonal mov... | <urn:uuid:08c97f1f-377d-4ce4-adc7-e5ef2f860701> | 3.296875 | 512 | Knowledge Article | Science & Tech. | 45.467044 |
I'm reading Goldstein's Classical Mechanics, the part on "Scattering" in the "Central Force" chapter.
In relation to the figure below, he says that angular momentum, $l$, is given by $$l=mv_0s$$ where $v_0$ is the velocity of the particle and $s$ is the distance from the line of the center of force(as shown in figure).... | <urn:uuid:d503f85f-396e-4df9-87c4-d35e5850c0e5> | 3.359375 | 185 | Q&A Forum | Science & Tech. | 62.247292 |
Henri Poincaré (1854-1912)
Born in 1854 in Nancy, France, Henri Poincaré was a visionary mathematician and philosopher whose innovative ideas continue to be used daily by engineers and scientists today.
After initial studies in mathematics and engineering, Poincaré was appointed as Professor of Mathematics at the Unive... | <urn:uuid:b40f40ab-9983-400f-a9d8-c7a5eff4fa8e> | 3.515625 | 309 | Knowledge Article | Science & Tech. | 21.735 |
The Great Dane would leave a legacy that few would even dream of rivaling. Niels Bohr was a quiet and shy man, whose contribution to 20th century physics is so fundamental that, without it, the whole edifice would only be half built. His brilliant insights into physical problems not only gave solutions, but also taught... | <urn:uuid:a00e7afe-e74e-4072-9a21-0beb4eaeca7b> | 3.40625 | 698 | Personal Blog | Science & Tech. | 56.434521 |
by Denyse O'Leary
Well, isn't that the key epigenetics question - what we really want to know.
From "Why Does the Same Mutation Kill One Person but Not Another?" (ScienceDaily, Dec. 7, 2011), we learn:
The vast majority of genetic disorders (schizophrenia or breast cancer, for example) have different effects in differe... | <urn:uuid:ce1eacc4-eec9-4549-ba3d-1e8ec4d61e36> | 3.015625 | 896 | Personal Blog | Science & Tech. | 36.639335 |
Article on everything2 describing the topology of the Asteroids universe as a torus (donut shape).
…So the topological part is this: when you fly up off the top edge of the screen, you magically appear at the same position on the bottom of the screen, and vice-versa. The same is true of the left and right edges. So con... | <urn:uuid:6b58f858-51d4-4b89-8f5e-00aa0b4faab4> | 2.90625 | 396 | Truncated | Science & Tech. | 56.012429 |
Tag: "chloroplast" at biology news
Transgenic plants remove more selenium from polluted soil than wild plants, new tests show
...eveloped by plant geneticists -- such as modifying chloroplast
DNA rather than nuclear DNA -- will eventually reduce the need for such constant monitoring. Since chloroplast
DNA is maternally... | <urn:uuid:aa95e26d-e9e2-4acf-b0df-424e11e53a7d> | 2.6875 | 567 | Content Listing | Science & Tech. | 48.403884 |
What is Scribble?
Scribble is a language to describe application-level protocols among communicating systems. A protocol represents an agreement on how participating systems interact with each other. Without a protocol, it is hard to do a meaningful interaction: participants simply cannot communicate effectively, since... | <urn:uuid:8f1f5b18-47f3-476d-a5e5-85b2a7608598> | 3.28125 | 360 | Documentation | Software Dev. | 24.845956 |
Photo courtesy Agricultural Biotechnology Council
What is biotechnology?
Biotechnology is the name that has been given to a very wide range of agricultural, industrial and medical technologies that make use of living organisms (e.g., microbes, plants or animals) or parts of living organisms (e.g., isolated cells or pro... | <urn:uuid:439febd4-8b25-4481-b413-a4d375fbac66> | 3.53125 | 1,884 | Knowledge Article | Science & Tech. | 31.060349 |
Renewable Energy - Pros and Cons
During the 1960's and 1970's people began to fear that the main source of energy, the fossil fuels, would run out. Fossil fuels are finite or non-renewable and once they are used they cannot be replaced. In recent years, people realised that there was enough fossil fuels to last for sev... | <urn:uuid:8daf9b8e-d271-4da4-87fa-3c465ec53cd8> | 3.203125 | 1,023 | Tutorial | Science & Tech. | 36.775565 |
Massive Smash-Up at Vega
This artist concept illustrates how a massive collision of objects, perhaps as large as the planet Pluto, smashed together to create the dust ring around the nearby star Vega. New observations from NASA's Spitzer Space Telescope indicate the collision took place within the last one million year... | <urn:uuid:82577950-2996-4f93-aeaf-a4fd84278b17> | 3.84375 | 174 | Knowledge Article | Science & Tech. | 32 |
There are several cases where Python statements are illegal when used in conjunction with nested scopes that contain free variables.
If a variable is referenced in an enclosing scope, it is illegal to delete the name. An error will be reported at compile time.
If the wild card form of import -- "import *" -- is used in... | <urn:uuid:09713cff-2fe7-4bdc-9a15-fb07f9d2f4a5> | 2.703125 | 318 | Documentation | Software Dev. | 52.210497 |
An Earth-approaching asteroid discovered in 2002 will be passing through the neighborhood Sunday night (July 22). 2002 AM31, a leftover fragment of rock from the solar system’s youth, will fly safely by Earth at a distance of 3.2 million miles (13.7 times the distance to the moon) around 8 p.m. (CDT) July 22.
With a di... | <urn:uuid:4164aafc-5556-4b19-b4bb-aebc1348941a> | 3.265625 | 310 | Personal Blog | Science & Tech. | 74.033929 |
Thomas, J.A., Telfer, M.C., Roy, D.B., Preston, C.D., Greenwood, J. J. D., Asher, J., Fox, R., Clarke, R. T. and Lawton, J.H., 2004. Comparative Losses of British Butterflies, Birds, and Plants and the Global Extinction Crisis. Science, 303 (5665), pp. 1879-1881.
Full text not available from this repository.
Official U... | <urn:uuid:3583164a-beb5-4c3f-b0d5-9dec37d47cca> | 3.578125 | 378 | Academic Writing | Science & Tech. | 54.432433 |
XPath is a language for finding information in documents. XPath is generally used to navigate through elements and attributes in an XML document but can also be used as a powerful query language.
Why does XPath matters? XPath is a major element in the W3C's XSLT standard - and XQuery and XPointer are both built on XPat... | <urn:uuid:5cf96609-4cb8-4c19-a88b-7a691989d612> | 3.203125 | 301 | Knowledge Article | Software Dev. | 50.435606 |
The astrophysically important wavelength region below ~ 1200 Å is still relatively unexplored, at least at low redshift where restframe observations must be obtained from space. Prior to the launch of FUSE (Moos et al. 2000), far-ultraviolet (far-UV) studies were limited to bright objects. The earliest spectral data fo... | <urn:uuid:44a802a5-5fb0-455b-a4bd-dbcf5e232cc1> | 3.421875 | 238 | Academic Writing | Science & Tech. | 54.109951 |
Short Summaries of Articles about Mathematics
in the Popular Press
"Error-Correcting Code Keeps Quantum Computers on Track," by by Barry Cipra.Science, 12 April 1996, page 199.
Today quantum computers are only a theoretical possiblity, but they have thepotential to surpass traditional computers by performing vast numbe... | <urn:uuid:5a24657e-fbc6-40e3-813f-f30013225ba2> | 2.8125 | 138 | Content Listing | Science & Tech. | 22.304825 |
Invasive comb jellyfish (M leidyi)
The American comb jellyfish (Mnemiopsis leidyi) invaded
the Black and Caspian Seas in large numbers in the 1980s. Its
presence and distribution led to major changes in the marine
ecosystem and resulted in economic losses, due to a decline in fish
and shellfish stocks.
In 2006 this spe... | <urn:uuid:a9683a31-8a70-4b3b-bd54-16112a8f6962> | 3.203125 | 647 | Knowledge Article | Science & Tech. | 35.397663 |
Weather and climate are different. Weather varies tremendously from day to day, week to week, season to season. Climate, on the other hand is average weather over a period of years; it can be thought of as the boundary conditions on the variability of weather. We might get an extreme cold snap, or a heatwave at a parti... | <urn:uuid:53d6d46c-c83b-44bb-ab60-58869ff55a1d> | 3.328125 | 2,717 | Personal Blog | Science & Tech. | 39.06733 |
Facts about Praseodymium
Facts about Praseodymium - Element included on the Periodic Table
Facts about the Definition of the Element Praseodymium
The Element Praseodymium is defined as...
A soft, silvery, malleable, ductile rare-earth element that develops a characteristic green tarnish in air. It occurs naturally with... | <urn:uuid:2717eb75-cc1b-412c-9e61-71e65dd3d26b> | 3.5625 | 857 | Knowledge Article | Science & Tech. | 27.619258 |
Planet Earth - Autumn 2007
NERC's award-winning free magazine, Planet Earth, is aimed at non-specialists with an interest in environmental science.
This issue is no longer in print.
* Unless specified, all articles are less than 1MB in size.
Leader Setting priorities.
News Summer floods, Antarctic monkeys and the origi... | <urn:uuid:a4910063-d7a4-4e4f-9557-dd5d3a3e7a75> | 2.953125 | 287 | Content Listing | Science & Tech. | 46.324365 |
|Feb24-13, 03:53 PM||#1|
Clarification of forces involved in electron shielding
In my chemistry class we just started doing stuff with ionization energy, atomic radius, etc., and I've heard the phrase "electron shielding" tossed around a lot. When I tried to look it up online, most places use "shield" as the verb descr... | <urn:uuid:9e3c8c29-b43a-4c96-afa6-296fb909c8d1> | 3.34375 | 404 | Comment Section | Science & Tech. | 42.542162 |
Source: Origins, A NOVA Presentation: "Where are the Aliens?"
Scientists have been looking for extra-solar planets for decades, but only recently, with better equipment and improved techniques, have they finally unveiled new and unusual planets. Since 1995, over 155 planets have been discovered orbiting stars other tha... | <urn:uuid:bd08f146-4e22-408c-bce0-e7cc36f15b72> | 4 | 707 | Knowledge Article | Science & Tech. | 36.106082 |
Biowaste to ethanol could soon power cars.
Converting a vehicle to run primarily on ethanol costs just a couple of hundred dollars. But ethanol won’t make much of a dent in gas use as long as the source of ethanol in the United States remains corn grain, which requires a lot of energy and land in order to grow. A much ... | <urn:uuid:404a4999-f68b-4a2a-960f-84a9154546aa> | 3.578125 | 692 | Content Listing | Science & Tech. | 35.107939 |
A thunderstorm, also known as an electrical storm, a lightning storm, thundershower or simply a storm, is a form of turbulent weather characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder. The meteorologically assigned cloud type associated with the thunderstorm i... | <urn:uuid:01b5a97a-7fb1-4720-849c-b401cd65e747> | 3.015625 | 320 | Content Listing | Science & Tech. | 49.272646 |
Hanny's Voorwerp / /, Dutch for Hanny's object, is an astronomical object of unknown nature. It was discovered in 2007 by Dutch school teacher Hanny van Arkel, while she was participating as an amateur volunteer in the Galaxy Zoo project. Photographically, it appears as a bright blob close to spiral galaxy IC 2497 in t... | <urn:uuid:ec559d8c-5054-450d-9fec-9a810d2a7b1b> | 3.59375 | 1,154 | Knowledge Article | Science & Tech. | 60.949696 |
See also the
Dr. Math FAQ:
Browse High School Constructions
Stars indicate particularly interesting answers or
good places to begin browsing.
- Drawing An Ellipse [11/24/1997]
How do you draw an ellipse with only a straight edge and a compass?
- Drawing Diagrams [08/02/1998]
I'm having trouble drawing a good geometry d... | <urn:uuid:dc7dfd0d-308c-4875-a5bb-967c68af5ddf> | 4.09375 | 1,699 | Q&A Forum | Science & Tech. | 61.799259 |
NGC 2903. - This galaxy has been observed by Burbidge et al. (1960a), who note a "hump" on the rotation curve along the northeast part of the major axis between 20" and 60" from the center. The only bright emission feature in this area is embedded in a broad dust lane which lies well inside of the luminous arm. Velocit... | <urn:uuid:d9f84f32-cb17-4828-abb9-10ecfb3ccb1d> | 2.84375 | 206 | Knowledge Article | Science & Tech. | 60.847818 |
Musical Instruments, Quality Characteristics
When the same musical note is played on a guitar and
violin, what makes violin and guitar sounds different?
Stringed instruments sound different for many reasons. What you hear depends
on how and of what the string is made, how the string is vibrating, how long
it vibrates, ... | <urn:uuid:b34d7b8b-91e0-40c4-bf36-30c7ec788184> | 3.515625 | 1,452 | Q&A Forum | Science & Tech. | 48.334166 |
Taxonomy: Class Blastocystea
Animal: Blastocystis hominis 5 05.jpg
Blastocystis hominis granular form. Cationized ferritin dispersed in central vacuole. Avacuolar forms change to multi-vacuolar forms and then central vacuolar forms and then granular forms (all 5-20 microns with 1-4 nuclei) when cultured or passed in fa... | <urn:uuid:5b536ad1-1d3e-4e43-81e2-af4004c85ff1> | 2.765625 | 143 | Knowledge Article | Science & Tech. | 50.062651 |
How to cool polar molecules
By Hamish Johnston
Talks at the APS are very hit and miss — especially for someone like me who wants a gentle introduction to a field rather than a full-on blitz of data and equations.
However, some talks are pure gold…it was definitely worth getting up early to hear Silke Ospelkaus’s 8 am l... | <urn:uuid:713832c7-b078-46a7-8e1b-e86358020b24> | 3 | 521 | Nonfiction Writing | Science & Tech. | 37.496408 |
float.h - floating types
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.
The characteristics of floating types are d... | <urn:uuid:de58604f-3a8f-4ab9-91f9-d69eb47ed5a7> | 3.375 | 1,174 | Documentation | Software Dev. | 39.782707 |
The central dogma of molecular biology DNA-> RNA-> Protein shows the direction of flow of information of how the cells use the information stored in our DNA to make the necessary proteins. But the situation in most eukaryotes is a little more complex than that simple statement. In most eukaryotes, a gene sequence in a ... | <urn:uuid:ea423ac5-aa50-44dc-aef8-7d48092e4367> | 4.09375 | 1,177 | Personal Blog | Science & Tech. | 51.282158 |
This is used to describe a class method. This is a function which takes
an extra argument as its first argument, for the
If the ‘#’ is immediately followed by another ‘#’, the second one will be followed by the return type and a semicolon. The class and argument types are not specified, and must be determined by demang... | <urn:uuid:3886fadf-0ab3-4fd2-9bad-b02bf0d619b1> | 2.953125 | 232 | Documentation | Software Dev. | 41.053589 |
Octopuses Carry Coconuts as Instant Shelters
Octopuses have been discovered tip-toeing with coconut-shell halves suctioned to their undersides, then reassembling the halves and disappearing inside for protection or deception, a new study says. “We were blown away,” said biologist Mark Norman of discovering the octopus ... | <urn:uuid:0dd49b18-2caf-41a3-b1b3-1e3a51d10207> | 3.71875 | 356 | Truncated | Science & Tech. | 32.353128 |
Jupiter Distant Encounter
Ulysses's orbit brought it into the vicinity of Jupiter during 2003 and 2004. During this encounter it made a unique path that reached high Jovian latitudes. Ulysses investigators made detailed observations in order to take advantage of this unique opportunity. Details of the encounter are giv... | <urn:uuid:32358603-c1b0-45bc-a7b0-12e54d6ba3cb> | 2.703125 | 733 | Structured Data | Science & Tech. | 45.355658 |
Climate Literacy Essential Principle 7
*7a. Melting of ice sheets and glaciers, combined with the thermal expansion of seawater as the oceans warm, is causing sea level to rise. Seawater is beginning to move onto low-lying land and to contaminate coastal fresh water sources and beginning to submerge coastal facilities ... | <urn:uuid:4b6f218a-962a-4cf0-a112-ebb52c789db7> | 3.84375 | 501 | Knowledge Article | Science & Tech. | 30.747647 |
I think it is called overloading. I'm not to sure what the first one is doing, but the second one is creating a new operator for the class A with the symbol =. This is done so that the members of the class can use that symbol in place of some more tedious operations.
Just to add on to what Smac said those are called th... | <urn:uuid:ff648592-194c-4a13-9120-739ac4ff8bdd> | 3.109375 | 178 | Comment Section | Software Dev. | 62.651554 |
Often in nature, the things with the least-impressive appearance prove to be the most significant. Take the case of the tiny Anopheles mosquito. At a fraction of an inch in length, it appears far less threatening to humans than, say, a great white shark or a grizzly bear. But appearances can be deceiving. Perhaps no ot... | <urn:uuid:d5346c7c-0ffd-41df-b856-f51567608c17> | 4.03125 | 693 | Knowledge Article | Science & Tech. | 25.950754 |
The Columns Strike Back
Table rows tend to make table columns look rather stupid. They do all the work, as the table is built row by row, leaving the columns feeling quite rejected.
Luckily for those eager columns though, the
col tags have come to their rescue.
These tags allow you to define the table columns and style... | <urn:uuid:a9aed1de-fa3f-4291-a884-eba49ee6a941> | 2.796875 | 621 | Tutorial | Software Dev. | 65.7575 |
Earlier this week, I visited GE’s Global Research Center in Niskayuna, New York, near Albany. Cool place, the home base for about 1,900 scientists, and one of four GE research centers around the world. The others are in Bangalore, Munich and Shanghai.
I wrote a column for FORTUNE’s website about GE’s venture investment... | <urn:uuid:476cd74b-ae19-465c-b03f-5530a70235fb> | 3.140625 | 383 | Personal Blog | Science & Tech. | 50.013069 |
State of the Climate
The State of the Climate is a collection of monthly summaries recapping climate-related occurrences on both a global and national scale.
- Global Analysis — a summary of global temperatures and precipitation, placing the data into a historical perspective
- Upper Air — tropospheric and stratospheri... | <urn:uuid:767902cf-7e28-48c3-93d5-203fd13a5e39> | 3.109375 | 1,533 | Knowledge Article | Science & Tech. | 51.018485 |
A tiny wind turbine in a test tank at Teddington, Middlesex, could hold the key to wind power's most difficult public relations problem: making this form of renewable energy environmentally acceptable to all.
The model turbine, which stands around 3 metres high, was developed as the first part of a three-stage research... | <urn:uuid:67da60de-95da-4e38-a31a-62f44d43aadc> | 3.234375 | 215 | Truncated | Science & Tech. | 48.807132 |
Developing a comprehensive picture of the geographic location and monitoring the health status of the earth's coral reefs is an enormous task, but one necessary to the development of sustainable resource managment strategies, practices and policies. Below is a list of mapping and monitoring techniques currently employe... | <urn:uuid:84a23c37-9dea-42e2-8216-7db2b43b69f7> | 3.921875 | 856 | Knowledge Article | Science & Tech. | 21.947817 |
var thetime=new Date();
As you can see, we are not assigning the new variable a direct value. Instead, the code above defines the variable as a new instance of the date object. This means we can use this variable in order to access the method functions of the date object. What are the method functions? Well, here a lis... | <urn:uuid:72dabbdd-d61e-42cb-98ab-8aafad4527d4> | 4.28125 | 1,587 | Tutorial | Software Dev. | 76.098962 |
Often, singleton pattern classes are used to broker concurrent access to a shared resource. You will see it in quite a few logger implementations. The pattern particularly useful if you have a an "expensive" resource that might not be needed during the course of the application. Since the singleton supports "lazy initi... | <urn:uuid:9220709d-bf5e-4f81-be84-6d0d57a9c82d> | 2.796875 | 316 | Comment Section | Software Dev. | 38.719543 |
Synonymous Platform Names:
Student Nitric Oxide Explorer
LEO > Low Earth Orbit > Polar Sun-Synchronous
Related Data Sets
There are no related records to this platform.
SNOE ("snowy") was a small scientific satellite that measured the effects of energy from the sun and from the magnetosphere on the density of nitric oxi... | <urn:uuid:dbd9f191-8458-41e1-b1fc-bbcd0a3b285f> | 2.953125 | 230 | Knowledge Article | Science & Tech. | 35.596648 |
Goddard’s First Homegrown Satellite, Explorer 10, Was Launched 50 Years Ago Today: We Talk to the Father of Explorer 10, James Heppner, About the ‘Opportunity Years’ at the Dawn of NASA
This photo from the early 1960s shows Goddard employees Earl Angulo (at left) and Ron Browning examining an Explorer 10 model attached... | <urn:uuid:972bf9f7-5fdd-41f6-9d0a-b682b8fa38dc> | 3.5 | 1,651 | Personal Blog | Science & Tech. | 47.322058 |
The manner of interaction (termed according to the Greek 'to hold or clasp to oneself as a shield
') of a coordinatively unsaturated metal atom with a ligand, when the metal atom draws the ligand towards itself. An important type of agostic
interaction is the C–H–Metal coordination
providing for the activation
of the C... | <urn:uuid:8dac6743-5a23-4a54-ab3a-68588562ea58> | 2.8125 | 191 | Knowledge Article | Science & Tech. | 68.632985 |
Earth System Science
All physical, chemical, and biological components (give examples) of the Earth are inter-twinned and therefore must be studied simultaneously to be understood from a process-oriented point of view
Life history, therefore, is best understood in the context of a changing and evolving Earth System.
Th... | <urn:uuid:b284577a-0058-4941-8def-0846e381f97d> | 3.5625 | 702 | Academic Writing | Science & Tech. | 32.072639 |
Pub. date: 2008 | Online Pub. Date: April 25, 2008 | DOI: 10.4135/9781412963893 | Print ISBN: 9781412958783 | Online ISBN: 9781412963893| Publisher:SAGE Publications, Inc.About this encyclopedia
PERU'S 0.5 PERCENT contribution of greenhouse gases to the world's atmosphere is small, compared to the impact on Peru expect... | <urn:uuid:839f7399-2475-459c-b35f-71f5e2497b4a> | 3.765625 | 252 | Truncated | Science & Tech. | 69.411591 |
An infinite series is an expression such as:
the dots imply that an infinite number of terms will be added.
To find the sum of an infinite series, we exam the
partial sums. The sum of the series will be the
limit of the partial sums (that is, the number that the
partial sums are approaching, if, in fact, they do approa... | <urn:uuid:962923d6-5ff3-4113-8a9b-52858d463e5d> | 2.984375 | 127 | Tutorial | Science & Tech. | 58.79 |
Math in the News
Scanning the Brain for Impending Error
Federico Cirett, a computer science doctoral student at the University of Arizona, is studying brain wave activity to predict when students will make mistakes.
Cirett observed university students who spoke English as a second language while they took the math port... | <urn:uuid:ac7d2149-c3b0-4ce6-8128-a498125e413b> | 2.765625 | 218 | Content Listing | Science & Tech. | 32.510345 |
Hosted by The Math Forum
Problem of the Week 1135
A "vampire number" is an integer with 2n digits that is the product of two n-digit numbers — the fangs — whose digits, when combined, form a permutation of the original digits (thus, multiplicity counts). The smallest vampire numbers are
Technical point: The fangs canno... | <urn:uuid:29e7a888-fb8b-4367-80da-3c18c9f575e2> | 2.75 | 179 | Content Listing | Science & Tech. | 60.824237 |
How to: Access Settings Events
Settings events allow you to write code in response to changes in application- or user-scoped settings. Settings events include the following:
The SettingChanging event is raised before a setting's value is changed.
The PropertyChanged event is raised after a setting's value is changed.
T... | <urn:uuid:0f104e9a-013d-47cd-89b5-bdb1b7001b19> | 3.1875 | 201 | Documentation | Software Dev. | 44.574796 |
4.5. Comparing clusters
In comparing the different clusters, it must be taken into account to which limit sources can be detected. Low-luminosity low-mass X-ray binaries with a neutron star tend to be more luminous than cataclysmic variables, which in turn tend to be more luminous than magnetically active binaries. Thi... | <urn:uuid:f2b9ef43-0e01-4d73-a548-f0aa48733bc3> | 2.953125 | 535 | Academic Writing | Science & Tech. | 54.191485 |
To encrypt data, enter the data ("plaintext") and an encryption key to the encryption portion of the algorithm. To decrypt the "ciphertext," a proper decryption key is used at the decryption portion of the algorithm. Those keys, which contains simply a string of numbers, are called public key and private key, respectiv... | <urn:uuid:f4ad4c44-8f51-4d27-b5f7-5fd819e4c420> | 4.3125 | 461 | Tutorial | Science & Tech. | 51.689 |
Symmetry breaking during flapping generates lift
New phenomenon in nanodisk magnetic vortices
(Phys.org) -- The phenomenon in ferromagnetic nanodisks of magnetic vortices hurricanes of magnetism only a few atoms across has generated intense interest in the high-tech community because ...
Tying light in knots
(PhysOrg.c... | <urn:uuid:8a4152a3-6dd6-4a7a-95f8-9d877363be90> | 2.71875 | 605 | Content Listing | Science & Tech. | 33.833721 |
Kate Stafford, an oceanographer at the Applied Physics Laboratory at the University of Washington, writes from Alaska, where she is participating in a visual census of bowhead whales.
We have been seeing a lot of polar bears lately. The first three weeks I was up here, I saw three. One was napping on a large ice floe t... | <urn:uuid:4b19ffc0-e364-41c6-9595-58ab8ecc4b08> | 3.0625 | 688 | Personal Blog | Science & Tech. | 44.901913 |
Left second from top: Kakapo
Left third from top:
Left fourth from top:
Crown Copyright, DoC
Left sixth from top:
Kauri, Alexander Turnbull Library
Top right: An immature
North Island saddleback,
Geoff Moon Illustration Credit
Left above top:
John Gerrard Keulemans
1842-1912, Huia (male
and female) Heteralocha
John Ger... | <urn:uuid:5c323ef3-9e08-4807-897b-32cb5ebeb2d0> | 3.734375 | 890 | Knowledge Article | Science & Tech. | 34.383698 |
|Java IO Introduction|
|Java IO Overview|
|Java Byte + Char Arrays|
|Java System.in / .out / .error|
|Java Readers / Writers|
|Java Input Parsing|
|Java Concurrent IO|
|Java IO Exception Handling|
File class in the Java IO API gives you access to the underlying file system. Using the
File class you can:
This text will ... | <urn:uuid:da71a81d-440e-4187-8748-9dce193c26ca> | 3.984375 | 819 | Documentation | Software Dev. | 52.212645 |
Science Fair Project Encyclopedia
If you're looking for the revolutionary communist Weather Underground Organization, see Weathermen
Weather forecasting is the science of making predictions about general and specific weather phenomena for a given area based on observations of such weather related factors as atmospheric... | <urn:uuid:7d7fe50b-2f73-4304-9e8f-611cb653e94d> | 3.875 | 813 | Knowledge Article | Science & Tech. | 32.298706 |
This is part of the Regional Summary series at www.appinsys.com/GlobalWarming
The Baltic Sea area has very few long-term stations in the GHCN database – and most are urban. The Baltic Sea area is interesting since it is a sea in the northern hemisphere with the countries to the north reaching the Arctic Circle. Accordi... | <urn:uuid:a2ee94a6-5424-49f6-b084-ad49566b5e45> | 3.78125 | 774 | Knowledge Article | Science & Tech. | 52.26736 |
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C IS USUALLY FIRST
The programming language C was originally developed by Dennis Ritchie of Bell Laboratories and was designed to run on a PDP-11 with a UNIX operating system. Although it was originally intended to run under UNIX, there has been a great interest in running it under the MS-DOS operating system on the IB... | <urn:uuid:c5e35e64-dd5b-4e52-9a15-550563f10019> | 3.234375 | 1,464 | Tutorial | Software Dev. | 36.120043 |
About Chlamydomonas reinhardtii
Chlamydomonas reinhardtii is a unicellular green alga from the phylum Chlorophyta, which diverged from land plants over a billion years ago. C. reinhardtii is a model species for studying a broad range of fundamental biological processes including the evolution of chloroplast-based phyto... | <urn:uuid:240ad128-338d-4a9a-a109-ad319ceffce6> | 3 | 239 | Knowledge Article | Science & Tech. | 20.345625 |
Such is the case at UC Santa Barbara, where theoretical physicists at the Kavli Institute for Theoretical Physics (KITP) cover the range of questions in physics.
Recently, theoretical physicists at KITP have made important strides in studying a concept in quantum physics called quantum entanglement, in which electron s... | <urn:uuid:e9fd60f0-c823-4ba2-8e81-99eab7cd251f> | 2.765625 | 143 | Truncated | Science & Tech. | 21.434053 |
How to synthesize a new kind of yeast cell — or person
September 19, 2011 by Amara D. Angelica
Scientists, in theory, could one day create whole new lifeforms, going way beyond simple cloning, new research at Johns Hopkins University School of Medicine suggests.
The scientists have now replaced the DNA in a yeast chrom... | <urn:uuid:9225ec42-e225-460b-9414-6d56f2dd81cd> | 3.234375 | 629 | Personal Blog | Science & Tech. | 46.097034 |
Try This: Space of Air
Does air take up space?
Balloon (minimum 9 inches)
Glass bottle with a small mouth
Pot of boiling water
Pot of ice water
These links below will take you into the world of astronomy and will help you learn more about the planets and stars:
Visit Astronomy magazine at
Visit Sky and Telescope magazi... | <urn:uuid:0845e953-2b51-4158-8309-a416cd60b4f6> | 3.4375 | 1,075 | Tutorial | Science & Tech. | 69.3978 |
Wave motions through a medium such as the ocean, that the physical
characteristics change with position in it, can create reflection within
these changes, so that the waves are trapped within. This trapping of the
waves is called a wave guide. Equatorial Kelvin Waves are non-dispersive
due to traveling within a wave gu... | <urn:uuid:dea76acd-104c-4978-ba51-3f9428bca1c5> | 2.71875 | 69 | Knowledge Article | Science & Tech. | 38.165 |
Curassanthura bermudensis Wägele & Brandt, 1985
Curassanthura bermudensis: lateral & dorsal view, after Wägele & Brandt, 1985
Taxonomic Characterization: Curassanthura bermudensis is a blind, unpigmented paranthurid. The body is 13 times longer than wide. The cephalothorax is longer than wide, with a pronounced rostral... | <urn:uuid:3ed01698-81f6-48a5-af88-6ad8795649de> | 2.921875 | 703 | Knowledge Article | Science & Tech. | 32.364368 |
The desert soil is alive! Well, the soil itself isn’t really living, but life occurs throughout the soil of the Mojave Desert, so it’s important to always stay on designated trails and roads when you are in the desert.
Small microorganisms called cyanobacteria, which are from the same family as blue-green algae, actual... | <urn:uuid:25b6930f-8f79-43ef-9d35-0ed4b7624093> | 3.71875 | 620 | Personal Blog | Science & Tech. | 43.052089 |
Fish farms have their proponents and their critics. But whether you're of the view that they provide an important source of protein or you think that fish farms breed diseases, there is one fact that's not under dispute: they have to be moved around every so often. That is because conventional fish farms are set up in ... | <urn:uuid:22192a0e-2809-4665-98e0-9847605c6323> | 3.484375 | 288 | Truncated | Science & Tech. | 38.377727 |
Taking Derivatives of Parametric Systems
Just as we are able to differentiate functions of x, we are able to differentiate x and y, which are functions of t. Consider:
We would find the derivative of x with respect to t, and the derivative of y with respect to t:
In general, we say that if
It's that simple.
This proces... | <urn:uuid:ee3b020e-6058-451c-9161-2e546b7b840a> | 3.8125 | 358 | Tutorial | Science & Tech. | 47.629696 |
(For previous posts in this series, see here.)
In my series on the logic of science, I recounted how philosopher of science Pierre Duhem had pointed out as far back as 1906 that the theories of science are all connected to each other and changes in one area will have unavoidable effects on others that should be discern... | <urn:uuid:842e052d-9e12-4d12-b938-66839c2b6f00> | 3.421875 | 1,001 | Personal Blog | Science & Tech. | 44.525166 |
Back to Project Listings
Objective: To introduce students to basic concepts of DC Electricity
Atoms, the fundamental building blocks of matter, are made of three kinds of particles:
The figure above shows a particularly simple atom (an "isotope" of hydrogen, called deuterium, which just happens to have one particle of ... | <urn:uuid:abfdb595-f8ef-4f4f-bb96-466a6b43ec04> | 4.3125 | 2,219 | Tutorial | Science & Tech. | 47.818421 |
What is method?
In programming language, method is something that you do to an object.
For example, the object is ‘door‘ and you want to apply an action ‘open‘.
In python you can write as: door.open().
door = object
open = method
( ) = argument
Argument is the place for parameters that you apply to the method.
For exam... | <urn:uuid:413ccabc-a30e-4365-84fe-9fb6d9f6c00d> | 4.03125 | 138 | Personal Blog | Software Dev. | 68.559473 |
WHAT IS WIND ENERGY? Wind is a form of solar energy, caused by the uneven warming of the earth's surface. This is why air masses have different temperatures and pressures, and are constantly moving to find a balance. The greater the difference in pressure, the swifter the air moves and the stronger the wind. People hav... | <urn:uuid:652a94bc-374a-4e43-b231-a93e1bf0b87d> | 3.5625 | 364 | Knowledge Article | Science & Tech. | 32.448693 |
Mid-19th century tool for converting between different standards of the inch
An inch is an Imperial unit of length. Sweden also briefly had a "decimal inch" based on the metric system: see below for more.
According to some sources, the inch was originally defined informally as the distance between the tip of the thumb ... | <urn:uuid:af2bf7ba-5e53-45ce-9cb9-f76c43fc25f1> | 3.421875 | 898 | Knowledge Article | Science & Tech. | 62.452159 |
On covering a figure with diamonds
In the American Mathematical Monthly (May 1989, pp.429–431), under the title “The Problem of the Calissons”, Guy David and Carlos Tomei present the theorem given below. Before formulating the theorem, we introduce some terminology.
We consider a regular triangularization of the Euclid... | <urn:uuid:c02a0f48-788c-46e0-85a8-2872a7ca6e07> | 2.6875 | 627 | Academic Writing | Science & Tech. | 48.539582 |
A sungrazing comet is a comet that passes extremely close to the Sun at perihelion – sometimes within a few thousand kilometres of the Sun's surface. While small sungrazers can be completely evaporated during such a close approach to the Sun, larger sungrazers can survive many perihelion passages. However, the strong e... | <urn:uuid:c4321242-98c1-403c-8200-ea03132de728> | 3.625 | 994 | Knowledge Article | Science & Tech. | 60.262249 |
Students can learn about the conditions necessary for hurricanes to form and sustain themselves. The discussion is accompanied by remote imagery and an animation showing how wind shear can retard the development of a hurricane. Links to more detailed information are embedded in the text.
Intended for grade levels:
Type... | <urn:uuid:68e2cf66-2896-4b10-897c-cec4e0d726b5> | 3.359375 | 212 | Structured Data | Science & Tech. | 23.564212 |
First-of-Its-Kind Map Details the Height of the Globe's Forests
ScienceDaily (July 21, 2010) — Using NASA satellite data, scientists have produced a first-of-its kind map that details the height of the world's forests. Although there are other local- and regional-scale forest canopy maps, the new map is the first that ... | <urn:uuid:6deb6827-1868-4c55-8279-ea7c2c373be7> | 3.515625 | 586 | Truncated | Science & Tech. | 49.037534 |
A celestial speck that astronomers thought was a meteoroid is in fact Jupiter's 17th moonits smallest, and the first found for 26 years. University of Arizona astronomers used the 36-inch telescope at Kitt Peak to track the object for a month last year. They estimate that the object orbits Jupiter once every two years ... | <urn:uuid:fac61dab-ddd3-4679-8a9b-fe15986909a4> | 3.03125 | 136 | Truncated | Science & Tech. | 50.101322 |
Look closely to see these tiny skeleton shrimp clinging to bryozoans, hydroids or algae. Their body shape and color help the shrimp to blend into their background. Their bodies are long, cylindrical and range from pale brown and green to rose. Some species can quickly change color to blend into their backgrounds.
Skele... | <urn:uuid:daf184fe-c00d-4cf2-91b8-eb867492fe3c> | 3.25 | 430 | Knowledge Article | Science & Tech. | 59.617054 |
Friday, September 14, 2012
The Sun rotates more rapidly at its equator than near its poles. The magnetic fields near sunspots reverse polarity from one eleven-year sunspot cycle to the next.
Changing Speed Polar Fields
In this model, electric current passes through both poles of the star. It then flows in long tubes em... | <urn:uuid:fb80a79a-2323-49d3-9778-4ead9932f00d> | 3.9375 | 1,079 | Personal Blog | Science & Tech. | 55.447692 |
June 16, 2004 ANN ARBOR, Mich. -- As our planet's population swells and increases demands on natural resources, ecological scientists should work with other experts to make sure our basic survival needs are met.
That's the conclusion of a group of researchers who have been pondering ways for ecological science to tackl... | <urn:uuid:90424c48-540f-4e82-990c-ef6777ec76d1> | 3.5 | 574 | Truncated | Science & Tech. | 29.169651 |
Want to stay on top of all the space news? Follow @universetoday on Twitter
Superstring theory is a theory in theoretical physics that seeks to reconcile quantum mechanics with the theories of relativity especially in the case of gravitation. The attempt to unite these two disparate disciplines of physics has been a so... | <urn:uuid:08baa1ae-08e7-48b1-8b61-62ae8fdfa752> | 3.78125 | 515 | Truncated | Science & Tech. | 42.606222 |
Scientists in the US have demonstrated a new technique for generating photons for use in optical quantum information processing: using a laser to excite a single photon from a cloud of rubidium gas.The technique, developed at the Georgia Institute of Technology Research, exploits the properties of an atom in which one ... | <urn:uuid:5f91c5db-3a8d-420b-b269-ad9a186e8e4a> | 3.328125 | 793 | Content Listing | Science & Tech. | 31.277816 |
Assassin bugs (Reduviidae) belong to the Hemipteran order, sometimes referred to as “true bugs.” Hemipterans also include aphids, leafhoppers, and cicadas. Like all Hemipterans, assassin bugs feed using a specialized proboscis, called a rostrum. However, unlike their vegetarian, sap-sucking cousins, assassins use their... | <urn:uuid:cfdc6a54-0fc5-486a-92bc-4f8615784fac> | 3.359375 | 1,119 | Personal Blog | Science & Tech. | 39.328582 |
Document: Diagram of seismic wave movement
There are two types of waves that can be used to study the Earth's interior:
- P-waves are Primary or Compressional Waves. Faster waves that have speeds of 5 km/s at the top of the crust, 8 km/s at the top of the mantle, and 14 km/s at the bottom of the mantle. They can travel... | <urn:uuid:2a0a22b8-1f00-445f-90a4-d8cc203549e1> | 3.984375 | 150 | Truncated | Science & Tech. | 73.026324 |