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Im doing this study and i have this question which I'm not 100% sure on, got me pretty stumped. anyone think they can help me?!
When a bowstring is pulled back in preparation in preparation for shooting an arrow, the string behaves like a spring. Suppose the string is drawn 0.700 m and held with a force of 450 N.
(a) W... | <urn:uuid:be100361-b747-432b-aa82-bae6a31a0f9c> | 3.0625 | 114 | Q&A Forum | Science & Tech. | 87.800794 |
Many curiosity values in atmospheric physics take on new life in the blogosphere. One of them is the value in Kiehl & Trenberth 1997 for the “atmospheric window” flux:
Here is the update in 2009 by Trenberth, Fasullo & Kiehl:
The “atmospheric window” value is probably the value in KT97 which has the least attention pai... | <urn:uuid:6a0ee484-7b19-408e-ac78-725428b86bbb> | 3.484375 | 3,308 | Personal Blog | Science & Tech. | 49.507164 |
University Consortium for Atmospheric Research (UCAR)
The Extreme Weather Sourcebook is a database maintained by the Societal Impacts Program (SIP) at NCAR of statistics on extreme weather events. The Sourcebook is intended as a resource for researchers, policy makers, the media, and the general public, among other use... | <urn:uuid:3221447c-95be-4fb8-9a41-4d1ab3a40267> | 2.78125 | 134 | Knowledge Article | Science & Tech. | 37.261664 |
DO YOU DO WITH A BEAR IN THE NEIGHBORHOOD?
Last week I heard about a dramatic environmental observation. The caller, Teresa, was a former colleague who had heard all kinds of environmental tales from people calling or emailing over the years when we worked together. So when she said, "I just saw something in our yard t... | <urn:uuid:15397127-b47f-4f8f-9edd-7cda43ce7aaf> | 2.765625 | 651 | Personal Blog | Science & Tech. | 55.919714 |
Remember in Jurassic Park when they got dinosaur DNA from an ancient mosquito’s stomach? Well, if they had been interested in dinosaur proteins, they only had to look at a dinosaur bone.
Dinosaur bones are at least 65 million years old. And all of the meat has turned to stone. Over this amount of time and with this muc... | <urn:uuid:3857fd43-a238-4918-89ae-7edb86e12353> | 3.390625 | 136 | Personal Blog | Science & Tech. | 58.679966 |
Old Faithful Geyser in Yellowstone National Park, Wyoming, derives its name and its considerable fame from the regularity (and beauty) of its eruptions. As they do with most geysers in the park, rangers post the predicted tiems of eruptions on signs nearby and people gather beforehand to witness the show. R.A. Hutchins... | <urn:uuid:7eae8e4b-b66b-4f54-8b4e-edebb11ec099> | 2.6875 | 164 | Knowledge Article | Science & Tech. | 57.38428 |
Computers powerful enough to model the electrical activity of the whole human brain, or to predict climatic disasters in time to prepare for them, will be available within four years. This claim was made independently by two supercomputer makers this month as they announced plans to build forerunners of such computers.... | <urn:uuid:4ef86ca5-9b65-4a25-a3a6-9eb9f0f3f558> | 3.84375 | 209 | Truncated | Science & Tech. | 40.656364 |
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Writes a string to a file
STRFILE(<cCharacterstring>, <cFile>, [<lOverwrite>],
[<nOffset>], [<lCutOff>]) --> nRecordedByte
<cCharacterstring> Designates the character string to write to a
<cFile> Designates a file name. Drive and path designations are
... | <urn:uuid:ee4d4ff7-9d34-4056-b04e-5c10dab9475a> | 3.140625 | 687 | Documentation | Software Dev. | 65.647003 |
Differential & Selective Bacterial Growth Media
MacConkey's, Mannitol Salt & Blood Agar
LAB NOTES from Science Prof Online
Bacterial growth media are used in labs to provide nutrients, moisture and a surface for bacteria to grow on. Some media will grow just about any type of bacteria, whereas other types are specializ... | <urn:uuid:3e6a32b6-7156-4846-9659-07fed261850c> | 2.984375 | 1,214 | Knowledge Article | Science & Tech. | 32.750738 |
[Carl Sagan speaking:] “There are in fact 100 billion galaxies, each of which contains something like a 100 billion stars.” Well, Carl Sagan would have loved to get the latest estimate of our galaxy’s planet count.
Caltech astronomers set their sites on a star called Kepler 32. It’s an M dwarf star, a class that’s smal... | <urn:uuid:8931d6cb-11d6-43f6-a5b2-7320883c317d> | 3.59375 | 267 | Truncated | Science & Tech. | 61.552839 |
|Previous||UML Classes||Table of Contents||UML Packages||Next|
A type constrains the values represented by a typed element.
PackageableElement (from Kernel ) on page 111
A type serves as a constraint on the range of values represented by a typed element. Type is an abstract metaclass.
No additional attributes
No additi... | <urn:uuid:e61aeabf-ab2e-4fc9-bd41-2ea3cceb92d7> | 2.6875 | 171 | Documentation | Software Dev. | 33.911665 |
This photo, taken from space, shows the Southeast Pacific Ocean on the left, with patches of stratocumulus clouds along the coast of South American. Moving to the right (east) one can see the low lying coastal Atacama Desert and the Andes Mountain Range.
Click on image for full size
Image Courtesy of NASA
What are VOCA... | <urn:uuid:2843f2be-f2d7-4222-a4d2-e8711cec9581> | 3.890625 | 551 | Knowledge Article | Science & Tech. | 59.946344 |
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2009 April 10
Explanation: These two frames, taken with a video camera and a telescope, reveal remarkable details of the International Space Station... | <urn:uuid:529567a3-03e9-42fa-96a3-38462c91af79> | 2.984375 | 283 | Knowledge Article | Science & Tech. | 32.271119 |
Structured Query Language (SQL)
The SQL Reference Guide is a multipart document designed to introduce the reader to the basics of SQL. In most Relational Database Management Systems [RDBMS] that use Structured Query Language [SQL] the following is the standard syntax. There are differences between SQL Server, MySQL, Or... | <urn:uuid:12ec4ee6-1e3e-46b2-98c8-9b180e62173f> | 3.71875 | 161 | Documentation | Software Dev. | 35.785989 |
There are five classes in an inheritance diagram, four of which represent synchronous servers of four types:
+------------+ | BaseServer | +------------+ | v +-----------+ +------------------+ | TCPServer |------->| UnixStreamServer | +-----------+ +------------------+ | v +-----------+ +--------------------+ | UDPServ... | <urn:uuid:08f765ad-0a8a-46cf-83df-f5e3eaac2257> | 3.234375 | 644 | Documentation | Software Dev. | 35.526051 |
Conic Sections/Types of Conic Sections
A conic section is defined as the locus of all points where the distance from the point to the focus and the point to a straight line known as the directrix is a constant ratio. This ratio is known as the eccentricity of the section.
- If the ratio is 1, the section is known as a ... | <urn:uuid:51d6b34f-aad4-4d1a-8853-bcd0b54dd827> | 3.78125 | 160 | Knowledge Article | Science & Tech. | 65.195122 |
The sched module defines a class which implements a general purpose event scheduler:
class class sched.scheduler(timefunc, delayfunc)
The scheduler class defines a generic interface to scheduling events. It needs two functions to actually deal with the “outside world” — timefunc should be callable without arguments, an... | <urn:uuid:43c8210c-fcca-4c42-b8cb-3a4d537ac4ff> | 3.1875 | 875 | Documentation | Software Dev. | 56.016109 |
Pulsars are objects in space that send out frequent burst of electromagnetic radiation, mainly in the form of radio waves or gamma rays. Pulsars receive their name from these pulses. Pulsars are rapidly spinning neutron stars (see Neutron star) which are surrounded by an extremely powerful magnetic field which surround... | <urn:uuid:a30530d6-bb47-4bd1-b593-ca2d81d84c9d> | 4.28125 | 271 | Knowledge Article | Science & Tech. | 45.708343 |
Source of Energy
Artificial tides, a Moon-based Source of Energy?
A method of having the Moon create artificial tides, for energy harvesting.
This presentation was conceptualized around 1998, but only
first placed on the Internet in March 2010.
Conceptualized around 1998, on the Internet March 2010|
- This is presented... | <urn:uuid:79aa6930-31b0-4ab6-bf34-50eb03176f84> | 3.65625 | 2,495 | Nonfiction Writing | Science & Tech. | 50.388643 |
According to the Cherubim particle model, the elementary particles that comprise every electron carry 1/4 of the electron's charge and can only move in an absolute 2-D plane. This limitation is at odds with experimental observations. In this post, I will describe the strange and fascinating properties of electrons, as ... | <urn:uuid:9b210c9c-d5a4-4b03-8efa-77c7eafea391> | 2.71875 | 936 | Personal Blog | Science & Tech. | 56.366476 |
by Monaca NobleRemember Snowmageddon 2010, the east coast storms that dumped up to three feet of snow over the mid-Atlantic? The February snowstorm was the largest in the region in nearly 90 years, resulting in the heaviest snowfall on record for Delaware (26.5 inches) and the third heaviest snowfall in Baltimore (24.8... | <urn:uuid:85c4153b-c253-46ae-90e9-2c456039d0e8> | 3.671875 | 803 | Academic Writing | Science & Tech. | 36.874264 |
Next: Representing the subsets I,
Previous: Linear Search : the Move-To-Front
Here the heuristic is slightly different from the Move-To-Front method : once
found, the transition is swapped with the immediately preceding one,
performing an incremental bubble sort at each access.
Of course, these two techniques provide a... | <urn:uuid:0b01cd4d-1c02-46d1-a198-f16d4a249bbf> | 3.0625 | 169 | Documentation | Software Dev. | 25.7052 |
[Full Text Link]
Chelonia mydas Species ID:
A hard-shelled sea turtle with a brown, green, or black oval shell (1) possessing two large curved flippers at the front of the body and two short rounded flippers at the rear (2). The head is small with a blunt snout (3) and two elongated rectangular scales (4) just above ea... | <urn:uuid:f0084a0b-6de4-4b42-8630-132779d3a1f4> | 3.234375 | 495 | Knowledge Article | Science & Tech. | 40.423225 |
Signal(Sig_Val val, ckt_time time): The Signal constructor accepts a signal value (which is simply an enumerated type) and the time at which the signal occurred. The corresponding private members of the Signal object are then initialized with these values.
\ friend ostream &operator <<(ostream &os, const Signal &sig): ... | <urn:uuid:ff2a24b4-ec9f-4dbb-ac38-52e15a505cb7> | 2.75 | 209 | Documentation | Software Dev. | 36.249681 |
SQL Set Functions
Part of the SQL For Dummies Cheat Sheet
The SQL set functions give you a quick answer to questions you may have about the characteristics of your data as a whole. How many rows does a table have? What is the highest value in the table? What is the lowest? These are the kinds of questions that the SQL ... | <urn:uuid:6fc09772-7032-4181-8f20-0544a7c6cd55> | 2.734375 | 153 | Documentation | Software Dev. | 59.217455 |
The information presented in this chapter provides the reader with an understanding of ground water’s origin, environment, movement, and interaction with surface water. For all practical purposes, ground water is all water beneath the surface of the earth. Because ground water is hidden from view, many people think of ... | <urn:uuid:cff29f22-cf67-4f85-a183-de890bc959f0> | 4.15625 | 512 | Knowledge Article | Science & Tech. | 34.143111 |
Revised: May 2012
Were it not for a handful of hobbyists, space flight would never have gotten off the ground. The nuclei of the teams that launched the first satellites, cosmonauts, and astronauts were science fiction fans who took their interests in astronomy and space flight so seriously that, in spite of the worldw... | <urn:uuid:314aeda9-316d-4cc9-954a-9d50d669c1d6> | 2.96875 | 1,549 | Structured Data | Science & Tech. | 73.270234 |
22/08/12 | LONDON
Outdoor learning sites such as botanic gardens, zoos and wetlands offer unique locations for children to gain first hand experiences of inquiry based science education (IBSE.) This course at WAKEHURST PLACE introduces the concept of IBSE and places its delivery in a botanical garden, to visiting schoo... | <urn:uuid:527c5472-da6c-412e-b353-666ff8af472f> | 2.734375 | 228 | Content Listing | Science & Tech. | 35.668409 |
12 December 2010
Posted in Science Live!
Think about a shallow tide pool that is subject to enormous changes in salinity, temperature, and water level. Now try to imagine the deepest, coldest, darkest part of the ocean, which is over 36,000 feet underwater. The open ocean covers nearly 70% of our entire planet, with an... | <urn:uuid:58aa0096-ec34-4941-b4b3-376464be3290> | 3.765625 | 221 | Personal Blog | Science & Tech. | 54.861579 |
PHP Database Related Using PostgreSQL With PHP Tutorial
Top Tutorials related to:PHP Database Related Using PostgreSQL With PHP Tutorial What is PHP ?
What is PHP, a tutorial which gives you a small introduction to PHP language.
PHP Database: In this tutorial you will get to know about databases, tables, query and othe... | <urn:uuid:e521ce9a-59ac-4eac-b70a-e6a02881abba> | 2.734375 | 261 | Tutorial | Software Dev. | 48.286658 |
The landscape and weather change greatly during the year in regions that have four distinct seasons.
Click on image for full size
Images Courtesy of Corel
The Four Seasons
The Earth travels around the sun one full time per year. During this year, the seasons change depending on the amount of sunlight reaching the surfa... | <urn:uuid:497f12c1-7498-41f2-bba1-c99982682b27> | 3.65625 | 570 | Content Listing | Science & Tech. | 61.29529 |
2.2 Non-essential Built-in Functions
There are several built-in functions that are no longer essential to learn,
know or use in modern Python programming. They have been kept here to
maintain backwards compatibility with programs written for older versions
Python programmers, trainers, students and bookwriters should f... | <urn:uuid:a785827c-07c9-4e62-82ec-a66d46ad1876> | 3.109375 | 550 | Documentation | Software Dev. | 47.913364 |
To begin with let us recall what entropy is. It's a measure for the number of micro-states compatible with a given macro-state. The macro-state could for example be given by one billion particles with a total energy E in a bag of size V. You then have plenty of possibilities to place the particles in the bag and to ass... | <urn:uuid:475a185d-d262-4635-9610-dbf4859c74fc> | 3.21875 | 1,375 | Comment Section | Science & Tech. | 49.319198 |
Have you ever played the game Telephone? In this game, several people sit in a circle, and the first person whispers an arbitrary message to his or her neighbor, as quietly as possible. The message is passed by successive whispers around the circle, and the last person attempts to repeat the message out loud. Typically... | <urn:uuid:1db4f84c-5262-4766-b90e-73a1398d94ff> | 3.71875 | 642 | Knowledge Article | Science & Tech. | 27.69533 |
Mathematical Methods of Theoretical Physics →
Abstract: Course material for mathemathical methods of theoretical physics intended for an undergraduate audience. Table of Contents 1 Unreasonable effectiveness of mathematics in the natural sciences 23 2 Methodology and proof methods 27 3 Numbers and sets of numbers 31 Pa... | <urn:uuid:8652cdaa-97ed-4377-b897-4b74c622d98a> | 2.71875 | 246 | Content Listing | Science & Tech. | 58.221895 |
Humans have been exploring this planet for almost 70,000 years. We have all been born out of, what is now Northern Ethiopia, and migrated all over the planet.
This picture shows the genetic heritage and migration of my own mother's DNA over the past 70 -100,000 years. She was a member of Haplogroup K.
This picture show... | <urn:uuid:ab830eac-9995-461a-b87c-e51bf63ab79c> | 2.9375 | 548 | Personal Blog | Science & Tech. | 55.749312 |
Flooded Fields in Oakville, Iowa
Photograph by John Stanmeyer/VII
Flooded fields surround an Oakville, Iowa, farmstead in the wake of heavy rains that saturated the Midwest in the summer of 2008. Rivers topped their banks and broke through levees, flooding farms and cities alike—some 100 blocks of Cedar Rapids were sub... | <urn:uuid:517c6a40-4794-4dd9-82ca-7b7ffdfd214a> | 3.375 | 1,713 | Content Listing | Science & Tech. | 44.052652 |
Been at this for hours..
the temperature ,P, of a conductor at time, t, is given by
Where P^0 is the initial temperature and T is a constant.
Express T in terms of P,P^0 and t and determine its value when p^0 = 190, P= 20 and t = 40
Any help would be much appreciated...Thanks | <urn:uuid:687bf1a2-35c7-4e86-88a9-60ed4a1c7460> | 2.75 | 79 | Comment Section | Science & Tech. | 100.78298 |
Video: Leo on Bioluminescence
Beyond the reach of sunlight, thousands of feet below the surface of the ocean, some creatures create their own light known as "bioluminescence." Take a trip through the mind of Leo Smith, who asks questions about deep sea fish evolution. Patterns in diversity can offer clues to why fish h... | <urn:uuid:9a304e1c-4993-4c6b-8b09-5331265c3adf> | 3.21875 | 141 | Truncated | Science & Tech. | 56.701468 |
What’s in an animal’s scientific name? Tributes to dead presidents, professions of love, and sometimes even adolescent humor.
I got to thinking about taxonomy—or how scientists name new species—after reading that a species of rugged darkling beetle, Stenomorpha roosevelti, had been named after President Theodore Roosev... | <urn:uuid:a58cc8df-9e09-4f81-9e21-5e847f6d2efd> | 3.1875 | 954 | Nonfiction Writing | Science & Tech. | 31.237717 |
Phil Gentry has provided us with the June global lower temperature anomaly analysis from the MSU data.
Global temperatures continue to rise
Global Temperature Report: June 2011 Global climate trend since Nov. 16, 1978: +0.14 C per decade
June temperatures (preliminary)
Global composite temp.: +0.31 C (about 0.56 degree... | <urn:uuid:107df935-0088-4ca4-b916-e342afdc1279> | 2.734375 | 531 | Academic Writing | Science & Tech. | 46.287272 |
NEW HAVEN, Conn.--In an ambitious attempt to replicate nature, various researchers are seeking to create fuels from water and sunlight, much the way plants do.
California Institute of Technology professor Nate Lewis on Saturday gave a snapshot of the "swing for the fences" research his lab is pursuing to make fuels dir... | <urn:uuid:c7cf1954-dad2-4a12-a28b-e7e5f3a3cf4e> | 3.421875 | 371 | Truncated | Science & Tech. | 36.02012 |
WA) or a designated USGS station name, if the site has a gaging station. The station identification number is the designated USGS station number. The full names of all sampling crew members should be entered as the investigators, with the crew leader's name in parentheses. Information on reach conditions is also noted ... | <urn:uuid:066328c6-dd2e-433b-a420-8e490d1b42c3> | 2.75 | 631 | Documentation | Science & Tech. | 23.920243 |
The Linux kernel is the core of the operating system and offers an interface for programs to access the hardware. The kernel contains most of the device drivers.
To create a kernel, it is necessary to install the kernel source code first. The recommended kernel sources for a desktop system are sys-kernel/gentoo-sources... | <urn:uuid:87eca8e0-5304-4fde-9562-e8c79b253145> | 3.40625 | 371 | Documentation | Software Dev. | 32.767967 |
A planet moves around the Sun in an elliptical orbit (see Fig. 8.39). (a) Show that the external torque acting on the planet about an axis through the Sun is zero, (b) Since the torque is zero, the planet’s angular momentum is constant. Write an expression for the planet’s angular momentum in terms of its mass m, its d... | <urn:uuid:fd9fd017-e012-4a52-aa26-be6e12d69235> | 3.71875 | 184 | Tutorial | Science & Tech. | 79.224545 |
Thanks to Gristmill for pointing to this amazing advertisment from a 1962 issue of Life Magazine. Humble Oil later merged with Standard to become Exxon.
And it's all true!
Reporting in the journal Nature in September, researchers from British Antarctic Survey and the University of Bristol describe how analysis of milli... | <urn:uuid:79d45b39-b74f-417b-a89c-fd2b07fbe7e8> | 2.984375 | 183 | Personal Blog | Science & Tech. | 38.710861 |
A motorist suddenly notices a stalled car and slams on the brakes, decelerating at the rate of 6.3 . Unfortunately this isn't good enough, and a collision ensues. From the damage sustained, police estimate that the car was moving at 18 at the time of the collision. They also measure skid...
A source of emitting sound o... | <urn:uuid:56f638c2-5f38-46fc-a211-c03653343b48> | 2.9375 | 917 | Q&A Forum | Science & Tech. | 71.919302 |
Echoes of Greenland
by Eve Lamborn
Editor's Note: The world's oceans are rising every year, and scientists are watching polar ice sheets carefully. Perhaps melting caused by global warming is contributing to the increase in water level. Come along with University of Kansas student Eve Lamborn now, as she recounts her F... | <urn:uuid:818a85c2-0247-419a-a3ee-29adff58358b> | 3.515625 | 1,218 | Truncated | Science & Tech. | 55.805723 |
isolating cells from Cockroach - (Mar/05/2012 )
I have been given the following task: you have cockroaches and in these cockroaches you will find unicellular eukaryotic cells that are visable with the naked eye, how would you isolate these cells and grow then?
This is what I came up with:
since they are visable with th... | <urn:uuid:5faf110d-e49e-4ae7-9adb-e2c7165b66c7> | 2.875 | 213 | Q&A Forum | Science & Tech. | 54.356111 |
Forest fertilization has increased 800% in the southeastern United States from 1990 to 1999, according to a story in today’s ScienceDaily. The move to more intensive forest practices is designed to increase productivity, but at what cost?
I was fully expecting the report to indicate damning impacts on water quality in ... | <urn:uuid:419d3211-9f44-44e2-9d6e-2619cbde0c17> | 3.015625 | 369 | Personal Blog | Science & Tech. | 32.531402 |
Strombus, common name the true conches, is a genus of medium to large sea snails with an operculum, marine gastropod mollusks in the family Strombidae, the true conchs and their immediate relatives.
The genus Strombus was named by Carl Linnaeus in 1758. There were around 50 living species recognized, which vary in size... | <urn:uuid:2cfd196d-4377-4f8d-a50f-ce600b21b558> | 4.09375 | 1,942 | Knowledge Article | Science & Tech. | 30.780486 |
Spreading like the ``Harlem Shake’’ meme, it seems every math classroom across the land now observes an in-school holiday called Pi Day. For the uninitiated, Pi Day is cleverly celebrated on March 14, or 3/14. A quick trip over to Pinterest regales you with endless examples of the hackneyed puns, cartoons, song lyrics,... | <urn:uuid:665ad377-a72a-4e46-881d-d1cc7e0ff4a1> | 2.859375 | 2,733 | Personal Blog | Science & Tech. | 53.337072 |
New in version 2.0.
Source code: Lib/xml/dom/minidom.py
xml.dom.minidom is a minimal implementation of the Document Object Model interface, with an API similar to that in other languages. It is intended to be simpler than the full DOM and also significantly smaller. Users who are not already proficient with the DOM sho... | <urn:uuid:994ac003-74cb-4d9d-81d9-af7117a337e5> | 3.015625 | 1,928 | Documentation | Software Dev. | 47.551603 |
Siamese Fighting Fish, commonly and incorrectly referred to as Betta fish (this is just a sub-species), inhabit Thai rice paddies in the wild and have become popular pets. They have aggressive behavior (thus the name) and are often hostile towards one another, especially between two males. Males are bigger than females... | <urn:uuid:85f2bec3-8c18-40e4-8b22-ef5e1bf034ad> | 2.9375 | 631 | Knowledge Article | Science & Tech. | 25.058451 |
Sorgenfrey line (idea)
Return to Sorgenfrey line (idea)
|The Sorgenfrey line, named after Robert Sorgenfrey (1915-1996), is the lower limit topology on the real numbers, R.
This topology has as its basis the collection of all half-open intervals [a, b) where a < b. The collection of open sets in R that comprises this t... | <urn:uuid:84f5dbed-1738-40cb-8059-b77b32f54bf2> | 3.125 | 264 | Personal Blog | Science & Tech. | 37.721 |
Summer is a critical time for polar bears and climate change is lengthening Arctic summers, which could have a substantial effect on bear populations. However, much of what is known about polar bears comes from studying them out on Arctic sea ice during late winter and spring. During summer, most sea ice retreats far t... | <urn:uuid:9155e62a-aae5-4e5f-afd1-fac090d491e9> | 4.03125 | 254 | Knowledge Article | Science & Tech. | 41.038035 |
In a previous post, the hunt for the roots, I showed how to develop the formula for the second degree polynomial. In this post I want to develop the formulas for the third and forth degree. Unfortunately this means that this whole post will be algebra and nothing else. This formulas were originally developed in the 16 ... | <urn:uuid:ef9707dc-70d4-4e86-9cb6-63ce51d357fa> | 3.171875 | 339 | Tutorial | Science & Tech. | 65.90835 |
- number and height of the barriers as well as the wells between barriers can easily be modified
- A single quantum well formed by two finite barriers result in resonance transmissions.
- A double quantum well slits the resonance peaks into two components.
- For N barriers, one gets N-1 quantum wells, resulting in reso... | <urn:uuid:39f340c7-f57e-487f-85a2-035b5b32f17e> | 3.25 | 177 | Knowledge Article | Science & Tech. | 41.675595 |
By Jason Palmer
Science and technology reporter, BBC News
Even the bonds to the hydrogen atoms at the pentacene's periphery can be seen
The detailed chemical structure of a single molecule has been imaged for the first time, say researchers.
The physical shape of single carbon nanotubes has been outlined before, using ... | <urn:uuid:a8c29b3e-d0ef-45ec-98b3-0898ece3d0bf> | 3.265625 | 691 | Truncated | Science & Tech. | 33.091705 |
Let's assume the following for conceptual simplicity:
The plate is an insulator with uniform surface charge density $\sigma$.
The electric field $\mathbf E(\mathbf x)$ is uniform, so there exists some vector $\mathbf E_0$ for which $\mathbf E(\mathbf x) = \mathbf E_0$ for all $\mathbf x$.
In both cases, the force on th... | <urn:uuid:2eb8ae3c-7aaf-4745-827d-3cf031f665c6> | 2.78125 | 231 | Q&A Forum | Science & Tech. | 56.35176 |
There are generally 4 uses for the parentheses
() in Python.
- It acts the same way as most of the other mainstream languages - it's a construct to force an evaluation precedence, like in a math formula. Which also means it's only used when it is necessary, like when you need to make sure additions and subtractions hap... | <urn:uuid:2167e400-cc5d-48f2-bff9-759cd0ed8988> | 4.0625 | 460 | Q&A Forum | Software Dev. | 43.926356 |
Kaggle recently ran another great competition, which I was very fortunate to win. The goal of this competition: detect clouds of dark matter floating around the universe through their effect on the light emitted by background galaxies.
From the competition website:
There is more to the Universe than meets the eye. Out ... | <urn:uuid:4564838e-b6e7-4ba4-a4b7-dc159ac71597> | 3.15625 | 1,030 | Personal Blog | Science & Tech. | 46.224805 |
For the first time, scientists at Exeter University have captured on film the process by which plants alert each other to possible dangers. When a plant is under attack it releases a gas which warns neighbouring plants to protect themselves.The ability of plants to communicate with one another isn't new; the novelty is... | <urn:uuid:c319e6b6-416b-49f8-817c-1305f897ed7f> | 2.96875 | 240 | Personal Blog | Science & Tech. | 55.534993 |
A) A ring with a 15cm radius and with a uniform charge of 20
microcoulombs is in the yz-plane with the origin at its center.
What isthe force on a -3 micro coulombs charge on the x-axis at
I tried to plug in the numbers for the above equations and
can'tseem to get the right answer. I first solved for E and
thenmultipli... | <urn:uuid:ffc98d53-eb57-4b1d-b251-be2d36b900b7> | 2.796875 | 208 | Q&A Forum | Science & Tech. | 83.83452 |
Major Section: HISTORY
Examples: :pc 3 ; print the third command executed :pc :max ; print the most recent command :pc :x ; print the most recent command :pc fn ; print the command that introduced fnSee command-descriptor.
Pc takes one argument, a command descriptor, and prints the command
identified by that descriptor... | <urn:uuid:db71ebea-2115-4eea-9c50-8f7c7df590fc> | 3.40625 | 1,042 | Documentation | Software Dev. | 57.583128 |
Pacific Rocky Intertidal Monitoring: Trends and Synthesis
Click here for Long-Term trends
Click here for Biodiversity Survey findings
East Point is located in the Northern Channel Islands, within the Channel Islands National Marine Sanctuary, on Santa Rosa Island, California. This site is located in an Area of Special ... | <urn:uuid:d2f0fbf1-2928-4342-8acb-7a7658d96d9e> | 2.859375 | 424 | Knowledge Article | Science & Tech. | 36.925235 |
MARSES Project Information
MARSES is an integrated research experiment devoted to searching for water, water-ice or permafrost layers believed to exist at some depth under the visible surface of Mars. There is much evidence that water once was abundant on Mars. There are stream lined islands formed by flowing water, fl... | <urn:uuid:98da7851-bedf-4961-a726-d4f33cb4a508> | 3.796875 | 481 | Knowledge Article | Science & Tech. | 33.365664 |
Hello, I am fairly new at Java and just have a couple of questions to help me understand exactly what kind of program, class I am supposed to write.
Create an Interval class that represents an interval of numeric values. For example, it could represent the interval [1,2].
This class will be used to perform computations... | <urn:uuid:76724f32-1d6c-4d95-9818-da534f13679a> | 2.828125 | 506 | Q&A Forum | Software Dev. | 63.840086 |
Hal Weaver Eyes
Astronomers have been treated to an amazing display of two
spectacular comets over the past year, and the grand finale is
coming in early April.
That's when comet Hale-Bopp, the largest and one of the most unusual comets ever observed by astronomers, will peak in brightness as it makes its closest appro... | <urn:uuid:faf8431b-f9fd-4eb1-ae56-fab0208adda8> | 2.96875 | 2,175 | Knowledge Article | Science & Tech. | 43.573435 |
Data and reporting
In this section:
Information about our local wildlife is essential for us, if we are to identify those species which most urgently require conservation action. This information is gathered by professional ecologists, local naturalist groups and members of the public, and is collected by local biologi... | <urn:uuid:604e10de-b22e-4c47-a0c9-41f84e8bf454> | 3.203125 | 449 | Knowledge Article | Science & Tech. | 32.322583 |
Q 'n A
Answers To Your Questions
SPACE TODAY ONLINE ~~ COVERING SPACE FROM EARTH TO THE EDGE OF THE UNIVERSE
Q. How old is the Universe? — Ashley B.
A. Many astronomers say the Universe is 13.7 billion years old, plus or minus 10 percent.
How do they know? There are four approaches to calculating the age.
1. One method... | <urn:uuid:0db0de51-3827-4c13-b0c5-efe64e7d71a6> | 3.578125 | 684 | Q&A Forum | Science & Tech. | 55.332383 |
What is Phenology?
What is Phenology?
Literally, phenology refers to “the science of appearance.” In the simplest terms, phenology is the study that measures the timing of life cycle events in all living things. The life cycle of an organism is the period of time involving a single generation through reproduction. So, ... | <urn:uuid:0da06caf-c818-4a21-9952-430647ad7bb3> | 3.609375 | 2,584 | Knowledge Article | Science & Tech. | 30.966608 |
Chapter 1 - Windows Controls
IN THIS CHAPTER
One of the early premises of the Windows operating system was to define a common set of user interface elements to be shared by all applications. The idea was that a user could learn one application and apply that knowledge to other applications. Each application shared comm... | <urn:uuid:0e78782d-fe4c-428a-b8cb-5a4457be25dd> | 3.3125 | 386 | Truncated | Software Dev. | 29.826717 |
Abstract written by OBIS-USA using Excerpts from CRED Homepage
The need for conservation of coral ecosystems throughout the world requires knowledge concerning the ecological requirements of species that make up the system, causes for the loss of any of the component organisms, and the requirements for the survival of ... | <urn:uuid:3b5cdbaf-bf42-4e45-a4f3-58e6aa5c149f> | 3.578125 | 412 | Knowledge Article | Science & Tech. | 23.653394 |
Chemical reaction in which at least one of the reactants is a high-molar-mass substance.
PAC, 2004, 76, 889
(Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003))
on page 894
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compil... | <urn:uuid:25c10637-63e6-4ea5-8d59-1ef373e72a19> | 2.859375 | 171 | Knowledge Article | Science & Tech. | 76.434444 |
“Examples of animals exhibiting maladaptive responses to evolutionary novel objects and becoming trapped. (A) A Cuban tree frog (Osteopilus septentrionalis) ingesting a decorative light that mimics the bioluminescent qualities of its insect prey. (B) A black-footed albatross (Phoebastria nigripes) killed by the ingesti... | <urn:uuid:c346205e-c681-4a94-982e-0412ed2d749a> | 3.359375 | 518 | Knowledge Article | Science & Tech. | 25.391169 |
The importance of the Laplacian is a reflection of the importance of Riemannian geometry, both for its own sake and in these other fields. (Obviously, absent a generalization, you can't have a Laplacian without a Riemannian metric.) In Riemannian geometry, the Laplacian is the first scalar linear differential operator ... | <urn:uuid:cb7bdc9a-fceb-4f16-b1ed-f2f1c445c099> | 3.203125 | 334 | Q&A Forum | Science & Tech. | 42.5212 |
Assembly: System.Windows.Forms (in system.windows.forms.dll)
/** @property */ public Color get_ForeColor () /** @property */ public void set_ForeColor (Color value)
public override function get ForeColor () : Color public override function set ForeColor (value : Color)
Property ValueA Color that represents the foregrou... | <urn:uuid:dba4e938-b7f7-408a-96f9-1aefc455d671> | 2.890625 | 333 | Documentation | Software Dev. | 30.062815 |
Chapter 15 - Numerical Models
- Numerical models are used to simulate oceanic flows with realistic
and useful results. The most recent models include heat fluxes through
the surface, wind forcing, mesoscale eddies, realistic coasts and sea-floor
features, and more than 20 levels in the vertical.
- Recent models are now... | <urn:uuid:d0171134-779a-4c01-be68-f7561cfdab17> | 3.453125 | 270 | Knowledge Article | Science & Tech. | 23.622841 |
cutting and burning trees
Why are scientists in Panama acting like Tarzan? Why are they climbing trees in the jungles of South America and Asia? It is well known that tropical rain forests all over the world are disappearing. People are cutting and burning them so they can use the land for farms. Unfortunately, they ar... | <urn:uuid:a1e530c4-1594-4747-a939-9283029974b0> | 3.046875 | 349 | Nonfiction Writing | Science & Tech. | 66.651451 |
A massive iceberg that had been blocking traditional shipping routes to McMurdo Station, the National Science Foundation’s research station in Antarctica, snapped in two seemingly overnight. The B-15A iceberg seemed to be intact in the Terra MODIS image recorded on October 7, 2003. But Moderate Resolution Imaging Spect... | <urn:uuid:1315f1b0-c1fe-49e3-8228-a963f3344e4f> | 3.859375 | 465 | Knowledge Article | Science & Tech. | 64.931171 |
The Tunguska Comet
Space shuttle science shows how 1908 Tunguska explosion was caused by a comet
The research, accepted for publication June 24, 2009 by the journal Geophysical Research Letters, connects the two events by what followed each about a day later: brilliant, night-visible clouds, or noctilucent clouds, that... | <urn:uuid:86f6820c-b936-4a2a-8e44-54de4254438c> | 3.4375 | 696 | Knowledge Article | Science & Tech. | 37.630563 |
Methods can accept properties and values that tell the method more specifically what to do, these go in the parenthesis. For instance, you might tell a child to sit down or you might want to tell them to sit down right now in the blue chair. The "right now" and "blue chair" part would be properties and values. Just lik... | <urn:uuid:4ca8b9fe-fb39-4434-b974-9f9a5eeb40d3> | 3.125 | 159 | Documentation | Software Dev. | 70.9699 |
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Global Warming, I’m certain by now most of the public worldwide know what this concept is about, and most probably tired of hearing what a huge problem it is but no long term solutions are being proposed. Unfortunately that is still a working progress, but in the m... | <urn:uuid:7be16f0d-3f96-45d5-88f2-b99146054ca4> | 3.640625 | 1,846 | Personal Blog | Science & Tech. | 41.301095 |
Study Estimates Land Available for Biofuel Crops
ScienceDaily (Jan. 10, 2011) — Using detailed land analysis, Illinois researchers have found that biofuel crops cultivated on available land could produce up to half of the world's current fuel consumption -- without affecting food crops or pastureland.
Published in the ... | <urn:uuid:4d021a48-c1af-4a97-b0d8-fa3a40c5dbd6> | 2.96875 | 242 | Truncated | Science & Tech. | 41.76391 |
DNA Walk is a vectorial representation of DNA sequences transformed into a planer trajectory. Two pairs of complementary nucleotides (A-T, G-C) is suitable for two dimensional vectorization, so the DNA sequence is moved upwards for A, downwards for T, to right for G, and to left for C, visualizing the trajectory.
DNA W... | <urn:uuid:7d43515d-cdf4-4038-96d3-cd546356dde4> | 3.28125 | 559 | Knowledge Article | Science & Tech. | 42.554217 |
A draft solution to the so-called "P versus NP" problem generated excitement in 2010 – will 2011 bring a correct proof?
Vinay Deolalikar made waves in August when his draft solution to a mathematical problem that haunts computer science hit the internet.
It's known as "P versus NP", and a correct solution is worth $1 m... | <urn:uuid:c7c0a27b-9a01-4986-9d16-e7a8b98b9f1f> | 3.046875 | 2,591 | Comment Section | Science & Tech. | 56.884296 |
Whiteflies have a strange life cycle that involves spending almost their entire lives in a sessile (immobile) state.
First-stage nymphs - termed "crawlers"
- hatch from eggs
- can walk short distances
- or are carried by air currents
Once the crawler has selected a feeding site under a suitable leaf it undergoes its fi... | <urn:uuid:d7e2a935-b75b-430a-b698-b2761d6579d5> | 3.40625 | 194 | Knowledge Article | Science & Tech. | 34.415205 |
The cold dry air of winter is perfect for some hair-raising experiments. Have you ever noticed how your hair sometimes stands straight up when you pop out from under your snuggly blankets in the morning? When you try to comb your hair, it might even get worse! Did you ever wonder why this happens?
In the photo, the boy... | <urn:uuid:7d93b9e7-b145-4c9d-9a7f-f31d83b2ff00> | 3.625 | 991 | Tutorial | Science & Tech. | 56.97227 |
[ edit ] Haskell :: Functional Programming with Types Haskell is a functional programming language. If you have programmed before and would like to see a little bit of how Haskell works and is different from other programming languages, you can get an overview . Haskell is unique for two reasons. The first is that it i... | <urn:uuid:602bdff8-c087-4243-9b32-fb9578e288c0> | 2.75 | 185 | Knowledge Article | Software Dev. | 40.020519 |
Scientists at the Bureau of Reclamation have increased the spatial resolution of the newest climate models to make them more useful for water managers.
Heat from cities can have far-reaching effects, disrupting circulation patterns and changing surface air temperatures thousands of miles away, according to a new study ... | <urn:uuid:0fa683a7-f61a-46aa-a000-564b7d616098> | 3.578125 | 284 | Knowledge Article | Science & Tech. | 27.827045 |
The ASSEMBLY sample program demonstrates how to construct an assembly between two products. An assembly relationship is constructed to relate the configuration management instances as well as the geometry. The program is broken down into functions which handle portions of the complete relationship. The input file for t... | <urn:uuid:463e196b-3838-494e-be91-775e100d339f> | 3.046875 | 461 | Tutorial | Software Dev. | 48.326727 |
Conservationists warned the rare Chinese white dolphins, also known as pink dolphins for their unique colour, face extinction unless urgent action against pollution and other threats is taken.
Nicky Phillips For more than 3 billion years since single-celled organisms first appeared on the planet, life has evolved in on... | <urn:uuid:0e584f43-a7a7-4f50-915c-0fbb701c443f> | 2.859375 | 731 | Content Listing | Science & Tech. | 40.040623 |
have incorporated an aerosol module into the NASA GMAO GEOS-4 general
circulation model and data assimilation system. Aerosols are
particles and droplets suspended in the atmosphere and transported by
the winds. Including the aerosols in the GEOS-4 model allows us
to simulate their global distributions. Aerosols play i... | <urn:uuid:24f642f8-0909-4222-88b8-bcfc1040c3b2> | 3.421875 | 184 | Academic Writing | Science & Tech. | 23.160611 |
To find out what tree rings are telling us about droughts in the Colorado Basin, and to get some current perspective on the current eleven-year drought in the region, listen to my radio story for The California Report and view the slide show of my journey to the region. — Gretchen Weber
Abbie Tingstad is a paleoclimato... | <urn:uuid:30222697-321c-4da8-a3f6-ed24b36dc378> | 3.4375 | 993 | Nonfiction Writing | Science & Tech. | 33.620021 |
Cosmic X-rays May Reveal New Form of Matter
Chandra observations of RX J1856.5-3754 and the pulsar in 3C58 suggest that the matter in these collapsed stars is even denser than nuclear matter, the most dense matter found on Earth. This raises the possibility that these stars are composed of free quarks or crystals of su... | <urn:uuid:7635515f-82ab-41cc-8187-b5e1139c8a3d> | 3.3125 | 281 | Knowledge Article | Science & Tech. | 46.931187 |
The hybridization for both of the oxygen atoms will be sp2 and the hybridization of the carbon atom will be sp. Remember when there is a multiple bond you only count the attached atom as one atom, because the pi-bond will require unhybridized p orbitals. Thus each oxygen atom has a carbon atom and two non-bonded pairs ... | <urn:uuid:6d466cff-ca35-48a7-8561-1e5d863bc5f4> | 3.75 | 262 | Knowledge Article | Science & Tech. | 54.939444 |
Groovy Science is a symbolic manipulation library for Groovy that is intended to be easy to "glue" to existing scientific Java (and Groovy) libraries.
There are no archive releases of Groovy Science yet, but the current source can be found at http://svn.codehaus.org/groovy-contrib/science/. To use it, you can do any of... | <urn:uuid:866fffb9-843d-41be-998c-36d426ffa4aa> | 2.859375 | 795 | Documentation | Software Dev. | 36.241944 |
|CONTENTS | PREV | NEXT||Java Remote Method Invocation|
The Java SE platform's distributed object model is similar to the Java SE platform's object model in the following ways:
- A reference to a remote object can be passed as an argument or returned as a result in any method invocation (local or remote).
- A remote ob... | <urn:uuid:f664af41-5876-4f9f-995f-4dbcf3af7c83> | 2.90625 | 286 | Documentation | Software Dev. | 23.034167 |
North American Ecology (US and Canada)
Resident in western North America, north to Alaska, with isolated populations in New Brunswick and Quebeck (Scott 1986). Habitats are mostly transition to lower Hudsonian Zone woodland openings, sometimes chaparral. Host plants are usually herbaceous and include many species, but ... | <urn:uuid:999db8cc-9f9f-45ff-925e-201ed5cc5100> | 2.90625 | 173 | Knowledge Article | Science & Tech. | 45.254451 |