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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For the following code (Java):
double d = (double) m / n; //m and n are integers, n>0 int i = (int) (d * n); i == m
Is the last expression always true? If it's not is this always true?:
i = (int) Math.round(d * n); i == m
The second question you ask concerns how large an ulp is in Java.
If the ulp exceeds
The following... | <urn:uuid:92a66715-a1a7-4fa8-b21a-8c811190980d> | 2.953125 | 299 | Q&A Forum | Software Dev. | 75.0905 |
The Hubble Space Telescope image at the bottom of the page centers on the 100-million-solar-mass black hole at the hub of the neighboring spiral galaxy M31, or the Andromeda galaxy, the only galaxy outside the Milky Way visible to the naked eye and the only other giant galaxy in the local group. This is the sharpest vi... | <urn:uuid:61ce33ac-5e69-40cc-b0c2-878d8fe39ada> | 3.96875 | 396 | Nonfiction Writing | Science & Tech. | 45.299761 |
. "14 Phylogenetic Trees and the Future of Mammalian Biodiversity--T. JONATHAN DAVIES, SUSANNE A. FRITZ, RICHARD GRENYER, C. DAVID L. ORME, JON BIELBY, OLAF R. P. BININDA-EMONDS, MARCEL CARDILLO, KATE E. JONES, JOHN L. GITTLEMAN, GEORGINA M. MACE, and ANDY PURVIS." In the Light of Evolution, Volume II: Biodiversity and... | <urn:uuid:55cab3b1-1212-4892-bff8-7c0c11fabf06> | 3.21875 | 597 | Academic Writing | Science & Tech. | 39.620324 |
Where have all the barn swallows gone?
My mother used to predict the weather by looking at the flight patterns of barn swallows. "Low flies the swallow, rain to follow." I have childhood memories of growing up with the "hirondelles" in the South of France, and I remember the excitement we felt when we spotted a swallow... | <urn:uuid:fde81580-a95a-45ab-af87-ace368979eb8> | 3.296875 | 589 | Personal Blog | Science & Tech. | 48.37415 |
Global Electric Circuit of Mars
Even though several missions to Mars have passed through the Martian atmosphere and have had extended research programs on the surface, to date there have been no measurements of the vertical profiles of atmospheric conductivity, electric field, or current density. Therefore, any conclus... | <urn:uuid:c0a53ff6-c167-4c10-a83a-7eb010061be6> | 4.125 | 411 | Comment Section | Science & Tech. | 29.546454 |
In the right light, everything casts a shadow—even an atom. A large object creates a shadow by physically blocking the light flying past it, and even a miniscule atom or ion can prevent photons with specific wavelengths from reaching their destinations.
Australian researchers from Griffith University captured a relativ... | <urn:uuid:ef9d1360-68e9-4c44-8819-53d1253d5910> | 4.0625 | 143 | Truncated | Science & Tech. | 29.175409 |
|Cambodian kukri. Photo credit: Neang Thy/FFI.|
The Cambodian kukri (Oligodon kampucheaensis) snake has curved rear teeth to hold and help swallow eggs.
July 16, 2012
A new species of egg-eating snake has been discovered in the Cardamom Mountains in south west Cambodia. The snake, named the Cambodian kukri (Oligodon ka... | <urn:uuid:b0c54ade-b47e-4882-8060-7514682bb336> | 3.09375 | 326 | Personal Blog | Science & Tech. | 55.008393 |
Not going to write out the whole question but here's the basics:
h = -0.5t^2g + d
h = height
t = time
g = gravity
d = starting height (which is 100m)
Find how long it takes a rock to fall to a height of 25m on each planet.
gravity for mars is g = 3.7m/s^2, gravity for venus is g = 8.9m/s^2
so I've got 25 = -0.5t^2(3.7)... | <urn:uuid:664d5622-d7d8-44e8-a2e3-a350efe06902> | 3.453125 | 212 | Q&A Forum | Science & Tech. | 109.72188 |
eldavojohn writes "A new paper presented at NASA's Goddard Space Flight Center in Maryland shows the rapid heating of the atmosphere directly above the fault days before the devastating earthquake hit. This is theorized to be the Lithosphere-Atmosphere-Ionosphere Coupling mechanism that occurs when large amounts of rad... | <urn:uuid:72b9084a-538a-4d52-82ac-180e17928b46> | 3.375 | 192 | Comment Section | Science & Tech. | 28.946038 |
In turn 4 people throw away three nuts from a pile and hide a
quarter of the remainder finally leaving a multiple of 4 nuts. How
many nuts were at the start?
Factorial one hundred (written 100!) has 24 noughts when written in full and that 1000! has 249 noughts? Convince yourself that the above is true. Perhaps your me... | <urn:uuid:db566095-870b-4cb7-96da-ad55c838e61c> | 3.078125 | 129 | Tutorial | Science & Tech. | 96.011 |
In a study published in British science weekly Nature today, a US team has extracted a light-sensing gene from a germ called a cyanobacterium to make the film.
They have stitched it into the cell membranes of Escherichia coli (E coli) bacteria so exposure to red light switches off a gene that controls the production of... | <urn:uuid:5c3c9141-30fe-426b-8552-2c19f82ee54b> | 3.75 | 200 | Personal Blog | Science & Tech. | 35.621527 |
In the fields of Brunei Darussalam in North Borneo, once a crown colony of Great Britain, lies the pitcher plant. The pitcher plant is carnivorous, capturing and devouring insects that seek to harvest its nectar.
The pitcher plant is beguiling, attractive, and has evolved many ways to seduce its predator. Insect prey i... | <urn:uuid:d154c88e-a442-467d-b74e-e4d4f5b06d39> | 4.46875 | 814 | Personal Blog | Science & Tech. | 56.723477 |
Science Fair Project Encyclopedia
A Hill sphere approximates the gravitational sphere of influence of one astronomical body in the face of perturbations from another heavier body around which it orbits. It was defined by the American astronomer George William Hill. It is also called the Roche sphere because the French ... | <urn:uuid:f81d57af-26b0-417d-a3da-623b0520f487> | 4.09375 | 901 | Knowledge Article | Science & Tech. | 55.514798 |
One of the great missions for the 21st century could be FOCAL — a space probe sent to the Sun’s gravity lens some 550 AU out. Gravitational lensing is becoming a major tool for astronomers, and we’ve even seen planetary detections using microlensing, looking at targets in the direction of galactic center and the faint ... | <urn:uuid:67333be5-020d-425f-91a3-bab86f9e54a6> | 3.75 | 1,072 | Knowledge Article | Science & Tech. | 32.564517 |
Role of nitrite and nitric oxide in the processes of nitrification and denitrification in soil: Results from 15N tracer experiments
Recent research has proven soil nitrite to be a key element in understanding N-gas production (NO, N2O, N2) in soils. NO is widely accepted to be an obligatory intermediate of N2O formatio... | <urn:uuid:b196782e-e8c8-4a10-b069-be7de0350e9b> | 3.078125 | 571 | Academic Writing | Science & Tech. | 30.901399 |
How Does Microwave Radiation Affect Different Organisms?
Grade Level: 9th to 12th; Type: Biology
This experiment will determine how microwave radiation affects fungi, bacteria, and plant life.
- Does microwave radiation destroy all life?
- Will varying lengths of radiation affect organisms differently?
Microwave ovens ... | <urn:uuid:6f7ddad6-eaaa-4fe2-91a7-f33b14e29931> | 3.515625 | 781 | Tutorial | Science & Tech. | 50.343943 |
STEP 2: Respond to the request.
Ask " How Would I Find Out ? "
STEP 3: Generate the result.
Ask " What does the result tell me? "
Problem Source: http://www.lincoln.ac.nz/educ/tip/39.htm
Solution presentation copyright Howard C. McAllister, 1998.
Given two intersecting straight lines and a point P marked on one of them... | <urn:uuid:654ae97b-b206-4c2f-9900-6f648e1b912d> | 4.21875 | 304 | Tutorial | Science & Tech. | 72.463489 |
A new era of discovery in particle physics has opened in November 2009 with the start-up of the Large Hadron Collider (LHC) at CERN, the European Organization for Nuclear Research, in Geneva, Switzerland. The LHC, a circular proton-proton synchrotron, will operate at the highest energies any particle accelerator has ev... | <urn:uuid:93d844b2-0499-48c6-8c77-d3706c01f856> | 3.359375 | 411 | Knowledge Article | Science & Tech. | 27.837314 |
|Sep4-06, 01:10 AM||#1|
vague question about polar coordinate basis
I hae a kind of strange, vague question. We know that any vector in R^2 can be uniquely represented by unique cartesian coordinates (x, y). If we wish to be more rigorous in our definition of "coordinates" we consider them to be the coefficients of the... | <urn:uuid:afad00f2-a3fb-4866-8a30-2db5c3d64117> | 2.859375 | 785 | Comment Section | Science & Tech. | 44.163306 |
Anyone who has ever bought or sold a home knows the three most important factors in real estate: location, location, location. Traditionally, geneticists did not think this principle had much to do with the variability of biological traits, but recent research now suggests otherwise. In fact, it looks as if a gene’s lo... | <urn:uuid:ae62ecbd-86a8-43b6-9c93-b135943e4e3c> | 3.46875 | 641 | Knowledge Article | Science & Tech. | 31.28423 |
Ship in a bottle catalysts
by David Bradley
Zeolites, porous catalytic minerals are commonly used in refining crude oil and as molecular sieves. Chemists would like to be able to use them for more varied reactions but they come only with pores of a limited range of sizes and shapes. Writing in Chemical Communications (... | <urn:uuid:a1c33fb0-a687-4ae8-9975-e66aac25a683> | 3 | 2,015 | Content Listing | Science & Tech. | 36.563609 |
Observations of eight distant clusters of galaxies, the furthest of which is around 10 thousand million light years away, were studied by an international group of astronomers led by David Lumb of ESA's Space Research and Technology Centre (ESTEC) in the Netherlands. They compared these clusters to those found in the n... | <urn:uuid:7f5a06f3-523e-4465-bafd-32f7904e8b88> | 3.828125 | 689 | Knowledge Article | Science & Tech. | 34.741751 |
Halldor Bolbeins/AFP/Getty Images
The Fimmvorduhals volcano near the Eyjafjallajokull glacier in Iceland
There have been countless earthquakes around the globe. Now the volcanic eruption in Iceland leads many to wonder if California could be next. California is better known for its earthquakes, but there are volcanoes ... | <urn:uuid:89e88c7c-d1a6-4796-b14b-283e82d9ae05> | 2.953125 | 136 | Truncated | Science & Tech. | 32.247 |
An array is a data structure consisting of a group of elements that are accessed by indexing. In most programming languages each element has the same data type. However, ColdFusion, as we will see, is not strictly typed and therefore allows any data type to be stored in combination. This allows strings, integers, boole... | <urn:uuid:c864d9ba-9b57-4461-bbe2-72c6df016777> | 3.5 | 180 | Personal Blog | Software Dev. | 38.7525 |
by Jim Algar
Washington DC (UPI) Jul 16, 2012
When a huge solar flare Thursday sent a magnetic storm heading toward earth, Americans heard the usual warnings of possible power outages, disruption of satellite communications and other effects -- and for the most part ignored them.
The warnings seem to come with every su... | <urn:uuid:419acc2f-c8b4-4efb-8e02-474fe492f130> | 3.125 | 935 | Truncated | Science & Tech. | 41.128721 |
Natural Gas: The Transitional Energy Source Against Climate Change?
Natural gas holds a composition of different gases, but it is primarily composed of hydrocarbons. However unlike other fossil fuels such as petroleum, the chemical reactions involved in extracting energy from natural gas is quite different, thus produc... | <urn:uuid:e1ef283e-90cf-47d4-b4e9-0473c61c118e> | 3.5625 | 639 | Personal Blog | Science & Tech. | 32.828376 |
Materials Analysis Using New X-ray Microbeams
Materials ranging from massive steel girders to the microscopic aluminum wires in computer chips are made of grains - tiny crystals with diameters measured in millionths of a meter (microns). If scientists could "see" these individual grains, they could determine their orie... | <urn:uuid:5dc98c9e-6b80-437a-9dd4-f8c1067fccad> | 3.890625 | 842 | Academic Writing | Science & Tech. | 22.616504 |
We were fortunate to have hosted three species of giant silkmoths (family Saturniidae) in Butterfly Magic this year. They are spectacular insects, but so unique and short-lived that one cannot generalize to moths as a whole from their life cycle and behavior.
Estimates differ as to how many species are in the Saturniid... | <urn:uuid:0ce2a6b5-4335-4fcf-9b4c-53ae4a8c42fa> | 3.21875 | 952 | Personal Blog | Science & Tech. | 45.645217 |
NASA scientists say a rise in black soot concentrations on the Tibetan Plateau has caused increases in temperature and has accelerated glacial melting since the 1990s. This September 2009 NASA image — based on weather and air chemistry models that used satellite and ground observations of soot and other air pollution —... | <urn:uuid:29630ac3-7a47-4132-9380-f7822d087612> | 3.703125 | 215 | Truncated | Science & Tech. | 28.648316 |
Simple aromatic ring
Simple aromatic rings, also known as simple arenes or simple aromatics, are aromatic organic compounds that consist only of a conjugated planar ring system with delocalized pi electron clouds. Many simple aromatic rings have trivial names. They are usually found as substructures of more complex mol... | <urn:uuid:baf5fc9d-6545-43b4-876f-3042aced01b7> | 3.828125 | 649 | Knowledge Article | Science & Tech. | 32.303571 |
|Name, Symbol, Number||Darmstadtium, Ds, 110|
|Chemical series||Transition metals|
|Group, Period, Block||10[?], 7 , d|
|Appearance||unknown; probably metallic,|
silvery white or gray
|Atomic weight|| amu|
|Electron configuration||probably [Rn] 5f14 6d9 7s1|
a guess based upon platinum
|e- 's per energy level||2, 8, 18... | <urn:uuid:59e106d8-94de-42a3-8f1a-c29d655a9e8b> | 3.34375 | 384 | Knowledge Article | Science & Tech. | 53.128974 |
- Gosselin, Louis and Bejan, Adrian, Constructal heat trees at micro and nanoscales,
Journal of Applied Physics, vol. 96 no. 10
pp. 5852 - 5859 [1.1782278] .
(last updated on 2007/04/06)
We consider the problem of cooling a two-dimensional heat generating conducting volume with one heat sink, such that the smallest fea... | <urn:uuid:b9e21808-32b8-4c54-b1fb-6ac2853b43c0> | 2.828125 | 360 | Academic Writing | Science & Tech. | 33.914771 |
The USGS Water Science School
The ground beneath our feet is not just rock, or at least, not just one kind of rock. Many different types of rock exist, and they have very different properties. Often, different types of rocks exist in horizontal layers beneath the land surface. Some layers are more porous than others, a... | <urn:uuid:fd37c377-92f6-4a55-8986-65ce196746c0> | 4.09375 | 188 | Knowledge Article | Science & Tech. | 52.357358 |
Count the triangles of any size. Extend the sequence. Find a formula for the number of triangles corresponding to v dividing lines from the vertex and h horizontal dividing lines.
Construct a matrix to generate general formulas for each row and column. What would the formula be for h horizontal lines and v lines from t... | <urn:uuid:c8a7e93e-7706-47c0-b836-e6d4c394c061> | 3.359375 | 70 | Q&A Forum | Science & Tech. | 59.895054 |
Solve the following:
b) a bacterial culture starts with 1500 bacteria. After 5h, the estimated count is 35 000. What is the doubling period?
c) When the function f(x)=ax3+7x2+bx-8 is divided by (x+1) it has a remainder of 18; and (x-2) is a factor. Determine a and b. | <urn:uuid:017c2b7a-627f-428b-8b55-4682a0c7db8d> | 2.8125 | 85 | Tutorial | Science & Tech. | 100.302727 |
How scientists use DNA
Name: Peter and Edmund
We would like to know some ways that scientists use DNA.
For instance, we have heard that scientists used DNA to
change fruits and vegetables, such as tomatoes, so they
don't spoil so fast.
We appreciate your help with this investigation, because
we have found a lot of info... | <urn:uuid:e9e6cc39-e0df-45c8-8b41-472d3e1c8894> | 3.109375 | 551 | Comment Section | Science & Tech. | 53.347447 |
Okay, some textbooks I came across, and a homework assignment I had to do several years ago, suggested that the reason we can skate on ice is the peculiar $p(T)$-curve of the ice-water boundary. The reasoning is that due to the high pressure the skates put on the ice, it will melt at temperaturs below $273 K$ and thus ... | <urn:uuid:b56c835e-8a22-4246-bae8-5dce68557ee3> | 2.796875 | 210 | Q&A Forum | Science & Tech. | 54.567857 |
5.3.4 Classes and functions
Instances of the TestCase class represent the smallest
testable units in a set of tests. This class is intended to be used
as a base class, with specific tests being implemented by concrete
subclasses. This class implements the interface needed by the test
runner to allow it to drive the tes... | <urn:uuid:397b8e92-4508-4edf-95e7-4afadec61c13> | 3.265625 | 531 | Documentation | Software Dev. | 49.896721 |
If one side of a triangle is extended beyond the vertex, an exterior angle is formed. This exterior angle is supplementary with its adjacent, linear angle. Since the angle sum in a triangle is also 180 degrees, the exterior angle must have a measure equal to the sum of the remaining angles, called the remote interior a... | <urn:uuid:228e8bd0-d92b-4e9d-8abe-ef4145427a6a> | 4.09375 | 563 | Tutorial | Science & Tech. | 52.785616 |
Shrinking sea ice cover
Sea ice cover has been shrinking in the Barents Sea and the Arctic generally over the past 30 years. In 2012, a record level of ice melt was recorded in the Arctic. There had never been so little ice cover since satellite measurements started in 1979. The Greenland ice sheet and glaciers in Sval... | <urn:uuid:733d3c7e-64a1-4d97-81b9-70361c31da3d> | 3.90625 | 522 | Knowledge Article | Science & Tech. | 31.148111 |
Chatham / Challenger project - Voyage 2 Sea-bed Ecology - Chatham Rise
Planning for the biological sampling voyages in 2007 was complex and required a rigorous approach to designing a sampling programme that would result in measures of biodiversity and characterisation of habitats in the survey area. A pragmatic approa... | <urn:uuid:b0df2211-d661-43f6-96e1-c85e0234ed25> | 3.1875 | 353 | Knowledge Article | Science & Tech. | 45.766184 |
When the geometry of the part is relatively uncomplicated and
the orientation of a flaw is well known, the length (a)
of a crack can be determined by a technique known as tip diffraction.
One common application of the tip diffraction technique is to
determine the length of a crack originating from on the backside
of a ... | <urn:uuid:0a0f59ff-fe3e-4b62-b189-0fcaee7b3d1a> | 4.1875 | 386 | Tutorial | Science & Tech. | 36.689076 |
Report an inappropriate comment
Larger Drops Fall Faster Than Smaller Drops, Due To Their Greater Mass.
Sun May 17 04:55:48 BST 2009 by Evil Rocks
Small drops have lower terminal velocities because there's a non-linear relationship to surface area (which determines drag) and weight, meaning that as drops fragment their... | <urn:uuid:cf96f3dd-56d3-427b-b7f4-c8f8102a8964> | 3.0625 | 186 | Comment Section | Science & Tech. | 48.92 |
Although dispersed over a wide geographical area in the Holoarctic Region since the Late Pliocene, the Alceini group is difficult to study today because remains are typically few and sparsely distributed, as the social organisation of these animals was probably non-gregarious.
Cervalces latifrons never reached the sout... | <urn:uuid:bc51be9a-3fe5-4a2b-a7ec-cbb8f227c56f> | 3.71875 | 825 | Knowledge Article | Science & Tech. | 21.404364 |
This is undoubtedly the most popular physics equation ever. Its like even fuckin’ junkies out there know about it, but few actually understand it. My understanding goes as follows (the bold part is the answer to your question, the remaining part is for better understanding) :
E represents energy
M represents mass
c rep... | <urn:uuid:148d2cf9-d632-487e-b46d-c107cd39610b> | 3.078125 | 536 | Personal Blog | Science & Tech. | 51.709526 |
7.3.3 Buffer Objects
Python objects implemented in C can export a group of functions called
the ``buffer interface.'' These functions can
be used by an object to expose its data in a raw, byte-oriented
format. Clients of the object can use the buffer interface to access
the object data directly, without needing to copy... | <urn:uuid:7ae674e6-a01d-4433-b923-1f19f739f973> | 3.375 | 1,067 | Documentation | Software Dev. | 36.098331 |
Data Entry in ProgressThis describes a final project that consists of a poster session and a written report on a student-chosen topic related to chemistry in everyday life. The students are asked to describe the chemistry of something in the world around us, relate it to at least one chemical concept we learned about i... | <urn:uuid:344139e3-c306-4669-aac9-50f8df7191de> | 3.765625 | 249 | Knowledge Article | Science & Tech. | 35.271717 |
Early sample of Fleming’s mould, 1935/1936
Alexander Fleming discovered penicillin with the help of the arts. He was a self-taught painter, creating art from microbial cultures — a hobby that triggered a breakthrough in antibiotics. Fleming’s lab was cluttered with petri dishes of bacteria in search of natural pigments... | <urn:uuid:c39b5658-6047-443b-9eb1-f139c285ac3d> | 3.859375 | 171 | Knowledge Article | Science & Tech. | 40.68 |
why 360 degrees?
See also the
Dr. Math FAQ:
segments of circles
Browse High School Conic Sections, Circles
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Find the center of a circle.
Is a circle a polygon?
Volume of a tank.
Why is a circle 360 deg... | <urn:uuid:208ab689-1499-4d45-9ef9-a6d21aef4b93> | 3.71875 | 1,780 | Q&A Forum | Science & Tech. | 67.187904 |
GHCN Temperature Adjustments Affect 40% Of The Arctic
By Paul Homewood
There has been much discussion recently about temperature adjustments made by GHCN in Iceland and Greenland, which have had the effect of reducing historic temperature levels, thereby creating an artificial warming trend. These can easily be checked... | <urn:uuid:886b6c76-3303-460e-8aea-43de863a45a1> | 3.21875 | 2,308 | Personal Blog | Science & Tech. | 71.183102 |
Does anyone know ......
lemstra at worldonline.nl
Mon Feb 23 04:23:23 EST 1998
Actually, even at the most deepest point of the ocean there is life. This
point is called the Mariana depth and is located east off the phillipines,
close to the island of Guam. (Please look up for correct depth and name)
The deepest part is... | <urn:uuid:4ef3b490-5ba6-4361-a50d-c36e5e71dc74> | 2.84375 | 446 | Comment Section | Science & Tech. | 70.20857 |
Positrons, Alpha Particles, and Gamma Rays
That's the case with beryllium 7, 7Be4.
Click on it in the applet and see what happens.
It decays to lithium 7--so a proton turns into a neutron. That makes sense...but how do you deal
with the electric charge problem now? Going from Be to Li, you lose charge; emitting an
elec... | <urn:uuid:913b4da6-4bad-410a-844c-25cda56081b4> | 3.671875 | 223 | Tutorial | Science & Tech. | 63.228556 |
It's fun to toss around theories about how there might be other universes out there, and there may even be some evidence that at least four of them have smashed headlong into our universe. You'd think proving that this is the case would be tricky, but neutrons may be taking trips to other universes all the time.
A few ... | <urn:uuid:b9af9da4-18ec-41ef-9edd-b4943fdd626a> | 3.109375 | 424 | Personal Blog | Science & Tech. | 42.224549 |
Spinner Dolphins, Stenella longirostris
Taxonomy Animalia Chordata Mammalia Cetacea Delphinidae Stenella longirostris
Description & Behavior
Spinner dolphins, Stenella longirostris (Gray, 1828), aka long-snouted spinner dolphins, measure about 2 m in length and weigh about 90 kg. They have small, pointed flippers and c... | <urn:uuid:b6759d84-a0f0-408a-8fa8-587dbc792175> | 3.15625 | 1,284 | Knowledge Article | Science & Tech. | 39.770552 |
Teen scientist Priyanka Satpute is using her scientific prowess and research skills to come up with a way to benefit communities in developing countries. With help from her classmates, the Nashua High School North student is designing a new electrical source: a battery powered entirely by bacteria.
A 50-gallon tub stor... | <urn:uuid:31f23041-a734-45e4-829b-418ac89aa492> | 2.796875 | 122 | Truncated | Science & Tech. | 37.192545 |
Simplified DNA Extraction from Cell or Tissue
|Author: Long-Cheng Li|
|Source: Protocol Online|
|Date Added: Tue May 14 2002|
|Date Modified: Thu Apr 29 2004|
|Abstract: This method doesn't require organic extraction and centrifugation. It's the most simplest way of preparing DNA and works great.|
DNA extraction withou... | <urn:uuid:d57d41e2-02ae-489d-83f0-cb282f25e3f3> | 3.0625 | 418 | Truncated | Science & Tech. | 65.763846 |
Web edition: August 8, 2012
Print edition: September 8, 2012; Vol.182 #5 (p. 10)
A handful of thirsty countries are guzzling their groundwater reserves much faster than those resources can be renewed.
India, Pakistan, Saudi Arabia, Iran, Mexico, and the United States lead the global pack of water-thirsty nations, resea... | <urn:uuid:4c1ec6b8-475b-452c-b5a3-17f71ef07782> | 3 | 430 | Knowledge Article | Science & Tech. | 58.958445 |
Call a large company these days, and you will probably start by having a conversation with a computer. Until recently, such automated telephone speech systems could string together only prerecorded phrases. Think of the robotic-sounding "The number you have dialed ... 5 ... 5 ... 5 ... 1 ... 2 ... 1 ... 2...." Unfortun... | <urn:uuid:b9928216-044d-41e2-82a1-7c3ff2a53cd6> | 2.796875 | 347 | Truncated | Science & Tech. | 41.566796 |
What causes or triggers the earths auroras (the Northern and Southern Lights)? The Earths fast plasma jet causes spacequakes and these trigger the aurora, also known as the Northern Lights (Southern Lights are called the Aurora Australis). Although the Solar plasma wind is part of the process, the solar wind is not the... | <urn:uuid:02c3b92a-5ccf-4835-8d67-9be509285e0b> | 3.71875 | 152 | Knowledge Article | Science & Tech. | 46.945 |
Mercury’s high density has been a longstanding puzzle in planetary science. Its density means that it must have a significantly higher iron abundance than Venus, Earth, Mars, or the asteroids, probably in the form of a large iron core. NASA’s MESSENGER mission has challenged many of the hypothesized ways to create an i... | <urn:uuid:52cc15ca-5132-449e-80e1-148f1eb206fc> | 3.46875 | 691 | Personal Blog | Science & Tech. | 44.784306 |
Things in Boo but Not Python
- quickly compile boo script to standalone cross-platform exe
- easy super(), and constructor automatically calls super() for you. If you don't have a constructor, one is created for you.
- set class properties via the constructor (constructor doesn't have to handle them explicitly):
x = My... | <urn:uuid:606e0ed4-90eb-4136-90f8-85e196fb30cb> | 3.046875 | 466 | Documentation | Software Dev. | 47.255485 |
Shakarad, M and Gadagkar, R (1997) Do Social Wasps Choose Nesting Strategies Based on Their Brood Rearing Abilities? In: Naturwissenschaften, 84 (2). pp. 79-82.
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Primitively eusocial wasp nests may be founded by one or a group of females. The solitary ... | <urn:uuid:4351aca8-ee3c-4729-9299-7ff8cab59b13> | 2.734375 | 264 | Truncated | Science & Tech. | 42.104329 |
When a large outlet glacier of North Greenland (Petermann Gletscher) discharged an ice island four times the size of Manhattan in August of 2010, the United States’ Congress held formal inquiries on its cause within days of the event. Congressmen, scientists, and the global media speculated that this event and concurre... | <urn:uuid:441a14d7-016b-443a-8d54-917c22f86c57> | 3.265625 | 1,029 | Comment Section | Science & Tech. | 63.46259 |
PDB EDUCATION CORNER: EARLY PROTEIN STRUCTURES
Part of the RCSB-Rutgers Open House (described in this newsletter's
Message from the RCSB PDB) was a celebration marking the opening of
the Molecular Art Mural. Painted by local artist Jessica Milazzo onto
the walls of RCSB-Rutgers, this mural depicts some of the earliest
... | <urn:uuid:91854a5c-9bb0-4b50-8bcd-0930adaab1b8> | 3.390625 | 1,202 | Knowledge Article | Science & Tech. | 56.045843 |
Respiration—gas exchange between blood and an outside medium (air or water)—always takes place across a wet membrane whether the organ hosting the blood is a gill or a lung. There is no fundamental difference between gills and lungs. Their essential anatomy is the same: a large surface area overlaying blood vessels. To... | <urn:uuid:fdba3b96-f5e2-4a8b-b711-469805834f36> | 3.9375 | 304 | Personal Blog | Science & Tech. | 44.531538 |
This section describes six possible topics on ocean life that can be incorporated into your science curriculum.
Origins and evolution of life: History of Marine Life
In certain areas, the Hall takes an historical approach to our knowledge about marine life, a kind of study known as phylogenetic evolution. All life on E... | <urn:uuid:75e0d8ed-00a4-4fce-b559-e6fdc0e2afe0> | 3.78125 | 1,164 | Tutorial | Science & Tech. | 26.800979 |
Solving Triangles by Reflection
A 5ft ladder leans against a wall as shown.
What is the angle between the ladder and the wall?
This is surprisingly easy to solve by using Reflection:
Here is the triangle with its reflection
Together they make an equilateral triangle (all sides equal).
|The angles in an
are all 60°
So t... | <urn:uuid:cfd3443e-80f8-42aa-a812-27a48f711820> | 3.25 | 200 | Tutorial | Science & Tech. | 64.793326 |
World's Fastest Road
Today, I'm going to get into a car and drive faster than I've ever driven before.
What is special, is not the car, but the road I'm going to be driving on. It may look like a perfectly normal road, but it's got two particular features. It's location and the direction it's heading.
This road is righ... | <urn:uuid:ff53844d-eb4f-4efc-aa2d-0d2c2925273c> | 2.796875 | 317 | Personal Blog | Science & Tech. | 69.692124 |
ICESat has provided a critical look at ice thickness at Earth's polar regions over the course of its seven-year life. That mission has now ended.
02.24.10 - ICESat has provided a critical look at ice thickness at Earth's polar regions over the course of its seven-year life. That mission is now coming to an end.
10.19.0... | <urn:uuid:376d4651-19a0-4b78-8a4d-985c26720709> | 3.734375 | 356 | Content Listing | Science & Tech. | 71.874403 |
Vincent J. Abreu, Paul B. Hays, and Wilbert B. Skinner
The distributions of most chemical species in the stratosphere are affected by both dynamical and chemical processes. Conversely, the distribution of certain photochemical species, such as ozone, can influence the radiative budget of the stratosphere, affecting tem... | <urn:uuid:847e10f0-9d8e-4e2a-9e0b-30e00f832315> | 3.203125 | 150 | Truncated | Science & Tech. | 23.823467 |
Sylon hippolytes M. Sars, 1870
|Sylon hippolytes on a Pandalus goniurus shrimp captured at 75 m depth, San Juan Channel.|
|(Photo by: Dave Cowles, August 2008 )|
How to Distinguish from Similar Species: This may be the only Sylon species. Its characteristic sack-like shape is distinctive.
Geographical Range: Arctic, Be... | <urn:uuid:93fc102a-fcfe-4a48-a039-699aefc29143> | 3.125 | 1,027 | Knowledge Article | Science & Tech. | 51.048788 |
This is an image showing the cratered surface of the planet Mercury.
Click on image for full size
In addition to being hot, the surface of the Earth was being cratered.
Even though the solar system was finished forming, there were still probably a lot of smaller planetesimals
debris around, too.
gravity of the large pl... | <urn:uuid:d929a63d-464f-47da-932d-0f4677c47132> | 4.5 | 288 | Knowledge Article | Science & Tech. | 38.204 |
In electron microscopy, scientists bounce electrons off of objects and track their rebound to form images, including 3D models, of the objects in very fine detail, down to picometer scales. While these highly detailed pictures can tell us a lot about how things are, they say somewhat less about how they got that way. T... | <urn:uuid:b35eb37a-3c69-4030-836d-ab21a115fd95> | 3.75 | 961 | Knowledge Article | Science & Tech. | 34.476805 |
We can see because neurons in our eyes take in visible light and relay electric signals to the brain. But some of the neurons in our retinas detect light that we cannot actually see. In fact, people who lose all their other retinal cells except these neurons are blind. If you shine a light in their eyes and ask them to... | <urn:uuid:5b25c20d-eb3f-4a12-984f-7159e3302081> | 3.046875 | 149 | Personal Blog | Science & Tech. | 66.397648 |
This module implements a file-like class, StringIO, that reads and writes a string buffer (also known as memory files). See the description of file objects for operations (section File Objects). (For standard strings, see str and unicode.)
When a StringIO object is created, it can be initialized to an existing string b... | <urn:uuid:849ddf84-9bbd-4596-9111-26d14f3d39a4> | 3.171875 | 597 | Documentation | Software Dev. | 52.0125 |
The illumination from a bulb varies directly as the intensity of the light and Intensity varies inversely as the square of the distance from the source. Two bulbs are placed 54 feet apart. The intensity, Ia, of bulb A is 64cd, and the intensity, Ib, of bulb B is 125cd. At how many feet from bulb A along the line betwee... | <urn:uuid:cbffcca7-aabb-4730-8895-b0d4e15e737f> | 3.28125 | 108 | Q&A Forum | Science & Tech. | 67.514565 |
ASP.NET books Page2 Posted on: February 14, 2008 at 12:00 AM
ASP.NET is a web programming platform developed by Microsoft. It is the successor to Active Server Pages.
ASP.NET books Page2
Introduction of ASP.NET ASP.NET is a web programming platform developed by Microsoft. It is the successor to Active Server Pages. The... | <urn:uuid:a155225e-a562-4b85-bb57-377d2b88302f> | 2.765625 | 407 | Truncated | Software Dev. | 38.637604 |
Specify the font of text:
The face attribute is supported in all major browsers.
The <font> tag is not supported in HTML5. Use CSS instead.
The face attribute of <font> is deprecated in HTML 4.01.
The face attribute specifies the font of the text inside a <font> element.
Tip: The value of the face attribute can hold se... | <urn:uuid:a9893c15-9ef0-4036-8d20-cb19bcbab06c> | 2.6875 | 275 | Documentation | Software Dev. | 63.418 |
Science subject and location tags
Articles, documents and multimedia from ABC Science
Thursday, 26 July 2012
About half the protected tropical forest areas in the world are losing biodiversity due to pressures both within and from outside the reserves, according to a new study.
Thursday, 15 September 2011
There's no su... | <urn:uuid:2c562245-8c10-4f14-8b34-ed5bb697ce23> | 3.171875 | 499 | Content Listing | Science & Tech. | 48.430269 |
Science Fair Project Encyclopedia
Once a local coordinate system xi is chosen, the metric tensor appears as a matrix, conventionally denoted G. The notation gij is conventionally used for the components of the metric tensor (i.e. the elements of the matrix). In the following, we use the Einstein notation for implicit s... | <urn:uuid:a212887d-518c-4b04-9bca-2cee4f23ebd8> | 3.46875 | 282 | Knowledge Article | Science & Tech. | 54.441905 |
Adding a tree parser stage
In the section about the token parser we revealed the structure of an XML document to be a tree. You did not see pretty much of it, though. The reason is that you did not actually build up any data structure from what you revealed. Such a data structure usually is described as an AST (abstrac... | <urn:uuid:16ef81ad-52f4-4d48-bd17-3b271455cc7d> | 3.1875 | 1,172 | Tutorial | Software Dev. | 57.711686 |
Over a period of time the perception of building
applications is changing very rapidly whatever it may be either desktop
applications, web applications or distributed applications. Now a days it has
become the practice to build applications as set of components that are
distributed across a network of machines and work... | <urn:uuid:69873a97-58c6-429e-bf68-6d0de914cbc7> | 2.75 | 2,708 | Documentation | Software Dev. | 38.046426 |
There are a huge number of effects of climate change.
Already, millions of people are dying each year.
The latest reports predict that over 100 million people could die by 2030 if the world fails to take action.
Each year, an increasingly larger amount of people will be affected with over 90 % of victims living in deve... | <urn:uuid:68e70d57-ea0d-421f-819d-76a386e0dbce> | 3.9375 | 1,597 | Personal Blog | Science & Tech. | 43.115784 |
The patterns of anomalous ocean temperatures,
atmospheric circulation and precipitation are consistent in indicating La Niña
conditions in the tropical Pacific.
During January negative equatorial SST anomalies less than –0.5ºC were
observed at most locations between the date line and the South American
coast, while ano... | <urn:uuid:0a742f85-526a-483b-b485-f0bfc6244e5d> | 2.71875 | 687 | Academic Writing | Science & Tech. | 26.180756 |
April 15, 2011
Insects have a highly sensitive sense of smell. Extremely low concentrations of odour molecules in the air are sufficient to be detected by receptor neurons on their antennae. Specific proteins, so-called receptor proteins, expressed in these neurons recognize the odours. The odour molecules bind to the ... | <urn:uuid:c9b249b5-351e-4111-81b0-077fbdf26506> | 3.953125 | 779 | Knowledge Article | Science & Tech. | 25.848158 |
Simple Harmonic Motion
All of the statements in Section B, aside from those dealing
with the terminology utilized in this work, can be deduced directly from
the postulates. Hereafter, the deductions will be cumulative; that is,
each statement may be a consequence, wholly or in part, of some conclusion
or conclusions pr... | <urn:uuid:96266945-9336-4d6e-9a7c-899300d5ee51> | 3.609375 | 1,314 | Academic Writing | Science & Tech. | 26.903189 |
Problem : If triangles JGS and RPC are congruent, to which segment is segment SJ congruent?
Problem : If triangles JHF and TLG are congruent, which angle is congruent to angle L?
Problem : Why aren't two triangles with three pairs of congruent angles necessarily congruent?
Problem : When the lengths of the sides of two... | <urn:uuid:7aa1c6ec-0ad1-48f4-ba58-a2a96cceddc3> | 2.859375 | 144 | Q&A Forum | Science & Tech. | 60.755107 |
Polymer chemistry or macromolecular chemistry is a multidisciplinary science that deals with the chemical synthesis and chemical properties of polymers or macromolecules.1 According to IUPAC recommendations,23 macromolecules refer to the individual molecular chains and are the domain of chemistry. Polymers describe the... | <urn:uuid:55a89ae6-f028-4553-a2cf-0c1c80ad2959> | 3.21875 | 1,319 | Knowledge Article | Science & Tech. | 25.97752 |
Definition: A string matching algorithm which builds a deterministic finite state machine to recognize the search string. The machine is then run at each location in turn. If the machine accepts, that is a match.
If you have suggestions, corrections, or comments, please get in touch with Paul E. Black.
Entry modified 1... | <urn:uuid:ac3a7c68-1e3a-45c3-8e90-1696858b6d07> | 3.140625 | 173 | Structured Data | Software Dev. | 65.304944 |
|San José State University|
& Tornado Alley
the Nucleons of Nuclei are, Where Possible,
Organized into Alpha Particles: The Proton Data
An alpha particle, composed of two neutrons and two protons, is an amazing structure. It is relatively compact and has an extraordinary level of binding energy compared with smaller nu... | <urn:uuid:30c32df9-8be5-4520-b8fa-ab4bea888fb7> | 3.78125 | 1,073 | Knowledge Article | Science & Tech. | 41.806385 |
Before you begin
Before you can use the Administration Console to install, start, and configure WebLogic Web Services, you must create one.
The WebLogic Web Services programming model centers around JWS
files and Ant tasks that execute on the JWS files. JWS files are
Java files that use Java Web Service (JWS) metadata ... | <urn:uuid:82ab5226-0726-4777-9eb1-b82eb36da3a7> | 2.859375 | 574 | Documentation | Software Dev. | 24.47286 |
The tuatara Sphenodon punctatus is one of the real treasures of the zoology museum. Tuataras (from the Maori word for peaks on the back) are only found in New Zealand and are seriously endangered.
Tuatara Sphenodon punctatus
Photograph: Martyn L Gorman
Tuataras may be grey, olive, or brickish red in color. They range i... | <urn:uuid:d4e77875-dd22-4423-829a-427951aacf07> | 3.703125 | 597 | Knowledge Article | Science & Tech. | 40.594697 |
Long-term consequences for Northern Norway of a hypothetical release from the Kola nuclear power plant
Howard, B.J.; Wright, S.M.; Salbu, B.; Skuterud, K.L.; Hove, K.; Loe, R.. 2004 Long-term consequences for Northern Norway of a hypothetical release from the Kola nuclear power plant. Science of the Total Environment, ... | <urn:uuid:b31c25a0-1424-473f-9e69-abde681a8aca> | 2.703125 | 602 | Academic Writing | Science & Tech. | 30.883899 |
During all the recent discussion around Neandertals and modern humans, it’s often pointed out that Homo sapiens is the sole extant representative of the genus Homo. I began to wonder “how unusual is this?” in a FriendFeed comment thread. What resources exist that could help us to answer this question?
Genera that conta... | <urn:uuid:0f37e09a-ea77-4cf6-81a9-f1c074397f29> | 3.28125 | 960 | Personal Blog | Science & Tech. | 49.729525 |
Classification of Differential Equations
While differential equations have three basic types—ordinary (ODEs), partial (PDEs), or differential-algebraic (DAEs), they can be further described by attributes such as order, linearity, and degree. The solution method used by DSolve and the nature of the solutions depend heav... | <urn:uuid:a1e29adf-d453-4c0d-9364-e6a558a63121> | 3.1875 | 874 | Tutorial | Science & Tech. | 29.686169 |
SOHO's unique view of a comet that fell to pieces
18 May 2001When Spain's Instituto de Astrofisica de Canarias reported on 28 July 2000 that an ordinary-looking comet was breaking up, some of the world's top telescopes watched its subsequent disintegration till nothing was left. The French-Finnish SWAN instrument on th... | <urn:uuid:bad799e9-f93b-4291-af48-9ac35a925990> | 2.984375 | 1,213 | Knowledge Article | Science & Tech. | 45.771008 |
pycrc provides a CRC reference implementation in Python and a source code generator for C.
The used CRC variant can be chosen from a fast but space-consuming implementation to slower but smaller implementations suitable especially for embedded applications.
The following functions are implemented:
- generate the checks... | <urn:uuid:6c2baf0c-563d-40f4-a14c-f98ad2c3e048> | 2.796875 | 358 | Documentation | Software Dev. | 38.882913 |
Peter Seligmann, Chairman and CEO of Conservation International.
You may have read last week's news of a ‘lost world' harboring scores of rare and previously unknown animals and plants, unearthed in a remote Indonesian rainforest, or the recent announcement of exciting undersea discoveries in the Caribbean off the Saba... | <urn:uuid:29d9f66e-58e3-4097-af51-5978fb8ab4e1> | 3.203125 | 836 | Nonfiction Writing | Science & Tech. | 44.33926 |
Ursi's Eso Garden
Your Competent Esoteric Guide
Friday, 26. October 2007
Comet Holmes Undergoes Huge OutbursOn Oct. 24, 2007, Comet Holmes shocked sky watchers with a spectacular eruption, brightening almost a million-fold from 17th to 2.5th magnitude in a matter of hours. The comet is now visible to the naked eye - ev... | <urn:uuid:b1f9514f-aec9-463f-8e89-9900006a65ba> | 3.109375 | 755 | Comment Section | Science & Tech. | 50.187526 |
Android Programming with App Inventor
Drag and drop your way to Android programming.
MIT App Inventor, re-released as a beta service (as of March 5, 2012) by the MIT Center for Mobile Learning after taking over the project from Google, is a visual programming language for developing applications for the Android mobile ... | <urn:uuid:08a024bb-2671-4b73-a537-951a5d93cb31> | 3.109375 | 2,430 | Content Listing | Software Dev. | 51.721129 |