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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One of the most well-known climate patterns that we have come to recognize and better understand is the El Niño. Every three to seven years during the months of December and January, the balance between, wind, ocean currents, oceanic and atmospheric temperature and bioshpere breaks down, resulting in a severe impact on... | <urn:uuid:d2dd8c61-d87f-4655-8044-9f51dc417b8f> | 4.53125 | 1,451 | Knowledge Article | Science & Tech. | 32.679065 |
Referenced from the manual:
The standard DES-based crypt() returns the salt as the first two characters of the output. It also only uses the first eight characters of str, so longer strings that start with the same eight characters will generate the same result (when the same salt is used).
Both entries have got the sa... | <urn:uuid:93cd0ef1-78c5-41fb-836a-fcb1b9aea467> | 3.15625 | 126 | Q&A Forum | Software Dev. | 53.887438 |
James E. Hansen, who directs the NASA Goddard Institute for Space Studies and is a leading climate scientist, has a must-read op-ed in the Washington Post.
Here’s how “Climate Change Is Here — And Worse Than We Thought” opens:
When I testified before the Senate in the hot summer of 1988, I warned of the kind of future ... | <urn:uuid:94b69e96-d6d7-4795-9ea8-719c993f1315> | 2.90625 | 299 | Personal Blog | Science & Tech. | 36.601229 |
ABOUT THE MOON: The moon is Earth's only natural satellite, a cold, dry orb whose surface is studded with craters and strewn with rocks and dust. The moon's gravitational force is only 17 percent of the Earth's gravity. For example, a 100 pound (45 kg) person would weigh just 17 pounds (7.6 kg) on the Moon. The tempera... | <urn:uuid:357ff5b4-f8e6-4a2a-9ecc-08d0e9f78327> | 3.90625 | 386 | Knowledge Article | Science & Tech. | 67.847088 |
A faint young sun
Some 3.8 billion years ago was a mystery that scientists have long attempted to solve. Way back then, the Earth was a completely different place, and so was the solar system. The sun shined with less luminescence — as much as 30 percent weaker — which meant the Earth should have been really cold. So c... | <urn:uuid:757cd624-19e1-4bce-86eb-80db2f9017f5> | 4.5625 | 656 | Personal Blog | Science & Tech. | 45.816265 |
The striped dolphin is thriving in the Mediterranean, despite the viral epidemic that has wiped out hundreds of the mammals in the past two years. This is the preliminary conclusion of a joint survey carried out by Greenpeace and the University of Barcelona.
Scientists on board the Green peace ship Sirius counted 2485 ... | <urn:uuid:ecee9610-802e-4d78-a780-a2fc4a995cdb> | 3.15625 | 144 | Truncated | Science & Tech. | 42.418655 |
Zero Gravity on Earth
Is it true that on earth there isn't a room capable of
reproducing a 0-gravity enviroment? If i'm right, it is immpossible to
have one. The only method to simmulate it, is to fly really
fastly towards the ground from a very high altitude? I have money on
this statement, I hope that it is immpossib... | <urn:uuid:7f93b529-d7f6-44d6-bb46-1e6b352a5a63> | 2.765625 | 543 | Comment Section | Science & Tech. | 63.292717 |
This past year has been riddled with extreme weather across the country. From floods to droughts to hurricanes, there is no doubt the weather has been strangely brutal.
"Well the first one that comes to most people's mind is hurricane sandy, so that would be like the number one, billions of dollars in damage and many, ... | <urn:uuid:45e01e67-b9e6-4ae4-9025-f02987b1c844> | 2.796875 | 362 | Truncated | Science & Tech. | 55.57971 |
Solid objects that are large enough to see and handle are rarely composed of a single crystal, except for a few cases (gems, silicon single crystals for the electronics industry, certain types of fiber, and single crystals of a nickel-based superalloy for turbojet engines). Most materials are polycrystalline; they are ... | <urn:uuid:1ae83d4c-13b0-4258-a925-e62bd547a4be> | 4 | 1,490 | Knowledge Article | Science & Tech. | 30.797175 |
Oxidation of Cyclohexanol to Cyclohexanone
There are four basic types of chemical reactions in organic
chemistry: combination, elimination, substitution, and
rearrangement. Today, you will be conducting a
reaction in which you will convert cyclohexanol into
cyclohexanone (oxidation). Although some of the finer points o... | <urn:uuid:b316d09b-f085-44df-88fb-e01b09ba1007> | 4.3125 | 1,342 | Tutorial | Science & Tech. | 41.284892 |
Swift Gamma-Ray Burst Mission
|Organization||NASA/Goddard Space Flight Center|
|Major contractors||Spectrum Astro|
|Launch date||2004-11-20 17:16:00 UTC|
|Launched from||Space Launch Complex 17
Cape Canaveral Air Force Station
|Launch vehicle||Delta II 7320-10C|
|Mission length||6 years
(8 years, 6 months, and 24 days... | <urn:uuid:b0845062-58dd-4539-877b-4cdb46c63107> | 3.140625 | 3,567 | Knowledge Article | Science & Tech. | 62.121566 |
An identifier is a type used to uniquely identify a resource, target...
One can think of an identifier as something similar to a file path. An
identifier is a path as well, with the different elements in the path
/ characters. Examples of identifiers are:
The most important difference between an
Identifier and a file p... | <urn:uuid:9c5edb5b-d49e-46db-a740-cae52e7a15e5> | 3.328125 | 173 | Documentation | Software Dev. | 47.62 |
The low-gain antenna sends and receives information in every direction; that is, it is "omni-directional." The antenna transmits radio waves at a low rate to the Deep Space Network (DSN)(see communication) antennas on Earth.
The high-gain antenna can send a "beam" of information in a specific direction and it is steera... | <urn:uuid:fa408335-2cc3-4ee0-8c0b-6312bdd7763b> | 3.640625 | 249 | Knowledge Article | Science & Tech. | 48.286658 |
Walter Kondratko [Steinmetz S, chemistry]
Identification of metallic ions using the flame test
Walter passed out a handout which was a modification of one he obtained as a participant in the Chemistry Van Project at Chicago State University.
Walter gave us his third mini-teach in as many sessions; he is our iron man th... | <urn:uuid:d647fdd0-eb6e-4fba-a018-bef28287e65f> | 3.359375 | 696 | Comment Section | Science & Tech. | 55.149078 |
Make a cube out of straws and have a go at this practical
Reasoning about the number of matches needed to build squares that
share their sides.
How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!
Count what you see:
how many ... | <urn:uuid:47a4129e-7b12-4c00-a3e6-e66fa3902a33> | 3.75 | 135 | Tutorial | Science & Tech. | 69.433125 |
Submerged Aquatic Vegetation, or SAV is an underwater garden for juvenile fish and small invertebrates and a barometer of water quality.
SAV produces oxygen and detritus that is exported to other habitats, and reduces moderate turbidity and turbulence. SAV is extremely dependent on clarity of the water column for its e... | <urn:uuid:f2115796-767b-4cca-8a26-2d896f966192> | 3.234375 | 413 | Knowledge Article | Science & Tech. | 31.822596 |
Shark bite scars on Sarasota Bay resident bottlenose dolphins
An analysis of shark bite scars on the Sarasota Bay resident bottlenose dolphin community and implications for habitat use
By Krystan Wilkinson, MS Student, University of Florida
January 2013 Nicks n Notches
Predator-prey relationships have long been an inte... | <urn:uuid:ca110d6c-e3a7-4e59-8468-e71902d4709e> | 2.921875 | 250 | Truncated | Science & Tech. | 26.48336 |
All Earth's water, liquid fresh water, and water in lakes and rivers. Credit: Howard Perlman, USGS
As human population grows and pollution levels rise, our demand for clean water increases but its supply dwindles. How long will it be before our planet cannot provide its population with enough clean water to survive?
So... | <urn:uuid:761f4b22-2834-46ef-8383-cada959a2647> | 3.703125 | 166 | Truncated | Science & Tech. | 51.039663 |
According to Newton's second law...
What does this mean?
Everyone unconsiously knows the Second Law. Everyone knows that heavier objects require more force to move the same distance as lighter objects.
However, the Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a... | <urn:uuid:0dbaf413-2390-4060-9852-eea72b1c38ce> | 3.953125 | 178 | Tutorial | Science & Tech. | 72.542541 |
Heliconius pardalinusMargarita Beltrán
Early stages: Eggs are yellow and approximately 1.4 x 0.9 mm (h x w). Females usually place eggs singly on growing shoots and tendrils of the host plant. Mature larvae have a white body and black spots, black scoli, and head and anal cap are orange; length is around 2 cm. Caterpil... | <urn:uuid:c6127d40-baf9-4118-9c3b-f7d4b5aa4cb1> | 2.84375 | 592 | Knowledge Article | Science & Tech. | 54.386364 |
The Chemists in the Library Working Group has compiled these electronic and print resources for further exploration of the theme of National Chemistry Week: Earth's Atmosphere and Beyond!. The resources have been classified by grade level and annotated.
- Composition of Earth's Atmosphere
- What the atmosphere is made ... | <urn:uuid:3f3a2129-7140-4c64-89ad-3b439bead4d3> | 3.796875 | 303 | Content Listing | Science & Tech. | 44.383024 |
An Entirely New Phase of Matter
A liquid crystal
In 1888, the Austrian chemist Friedrich Reinitzer, working in the Institute of Plant Physiology at the University of Prague, discovered a strange phenomenon. Reinitzer was conducting experiments on a cholesterol based substance trying to figure out the correct formula an... | <urn:uuid:fda62f66-5bb7-4a7c-91d9-5acfa6c2936a> | 3.796875 | 1,806 | Knowledge Article | Science & Tech. | 41.794194 |
The Impulse-Momentum Change Theorem
Improve your problem-solving skills with problems, answers and solutions from The Calculator Pad.Flickr Physics
Visit The Physics Classroom's Flickr Galleries and take a visual tour of the topic of momentum and collisions.Flickr Physics
Some photographers have too much phun, like the... | <urn:uuid:c2d45784-61a4-4829-8c44-1f55d422f3fa> | 4.21875 | 1,396 | Tutorial | Science & Tech. | 71.398065 |
This is a printer version of an UnderwaterTimes.com
To view the article online, visit: http://www.underwatertimes.com/news.php?article_id=80274351016
Squid (Gonatus onyx) carrying egg mass. (Image courtesy of Monterey Bay Aquarium Research Institute)
Rhode Island -- Squid have always been considered poor parents: they ... | <urn:uuid:ecee96e1-b448-48dd-b75b-0baa2de18577> | 3.703125 | 454 | Truncated | Science & Tech. | 41.913277 |
Small wetlands in this large area have hosted migratory birds for a long time, but with changes in agricultural practice and regional climate those habitats may not remain hospitable to the wild populations.
Assessment of the importance of the Conservation Reserve Program in preventing the decline of grassland breeding... | <urn:uuid:253c45e3-4f25-4434-a71f-6ca7a5ffb55d> | 3.265625 | 368 | Content Listing | Science & Tech. | 29.845862 |
TRMM Observatory and Instruments
GSFC designed, built and tested the observatory "in house" at its Greenbelt, Md., facility. At launch, the observatory weighed 7,920 lbs. (3,600 kg). It is about 17 feet tall (approximately 5 meters) and 12 feet (3.6 meters) in diameter. A gallium arsenide solar array/nickel cadmium bat... | <urn:uuid:049b81f3-e142-4036-a6e0-76c2a6c233f5> | 3.0625 | 612 | Knowledge Article | Science & Tech. | 35.1425 |
I really dont get this, and need someone professional to explain this to me.
XYZ has coordinates X(12,9), Y(-1,4), and Z(8,16). After a dialation with a center at 0, X' is (3,1.8). What is the scale factor? What coordinate is Y' & Z'?
I can see why you are confused by this problem! But first, let's review dilations.
A ... | <urn:uuid:2dba80ba-d33d-4bfd-9807-7f203da3a64e> | 3.6875 | 861 | Q&A Forum | Science & Tech. | 85.486299 |
|What Is The Madison Aquifer?
The Madison aquifer is that part of the Madison Limestone that is saturated with ground water. The Madison Limestone is a rock formation, composed of limestone, that is exposed in the Black Hills area. It is sometimes called Pahasapa Limestone. It is a hard, crystalline rock that is compos... | <urn:uuid:50b5eeb5-5e1d-48c3-b883-ccd22de37fc6> | 3.71875 | 1,005 | Knowledge Article | Science & Tech. | 42.939544 |
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.
2007 May 14
Explanation: When passing Earth on your way to Jupiter, what should you look for? That question arose for the robotic Galileo spacecraft... | <urn:uuid:ed6d5948-2907-456c-91a8-8ac7854bdfab> | 3.140625 | 303 | Knowledge Article | Science & Tech. | 39.203048 |
Building on my recent discussion of common method names, I wanted to add a little more detail on factory methods. Of course, this relates to Java - other languages have different conventions.
One of the habits I have got into is using factory methods for immutable classes and constructors for mutable ones. Like all rul... | <urn:uuid:d09e25aa-2cb8-4e2b-91d2-2e7b46fb6d5f> | 2.71875 | 814 | Personal Blog | Software Dev. | 46.541694 |
Chemistry of Hydrogen
Hydrogen is one of the most important elements in the world. It is all around us. It is a component of water (H2O), fats, petroleum, table sugar (C6H12O6), ammonia (NH3), and hydrogen peroxide (H2O2)—things essential to life, as we know it. This module will explore several aspects of the element a... | <urn:uuid:8a734d9f-95d6-4f36-a7ae-1b9ddcd77d77> | 4.09375 | 1,974 | Knowledge Article | Science & Tech. | 44.933 |
data: heavy metals in till.
includes 1407 samples from till (moraine) over the area of 100
x 100 kilometers. Variables are: X, Y (sample coordinates, m),
Cu (copper), Co (cobalt), Ni (nickel), Pb (lead), V (vanadium),
Zn (zinc) (contents, ppm=parts per million). Glacial till is a
mixture of rock material, and the level... | <urn:uuid:1d97e066-2896-4980-a926-b92e4467e3eb> | 3.375 | 949 | Academic Writing | Science & Tech. | 48.824327 |
Indeed, one theory proposes that the Tunguska object was a fragment of Comet Encke. This ball of ice and dust is responsible for a meteor shower called the Beta Taurids, which cascade into Earth's atmosphere in late June and July - the time of the Tunguska event.
Does Lake Cheko have anything to do with the Tunguska bl... | <urn:uuid:12959d28-9076-4cea-b9a1-60735a553407> | 3.359375 | 423 | Personal Blog | Science & Tech. | 42.274977 |
this is a true/false question, and i know i can use a graphing calculator, but i dont quite remember how to do it, or what signifies this to be true or false. help please!
two runners are 100 ft. apart. On a signal, they run to a flag on the ground midway between them. The faster runner hesitates for 0.1 sec. The follo... | <urn:uuid:a9e00467-0e1f-48fe-aca5-0941b7e9b25f> | 2.6875 | 116 | Q&A Forum | Science & Tech. | 71.066728 |
2.4 Lyman Continuum Optical Depth
An additional, important piece of information about the gas distribution and optical depth comes from studying the wavelength region around the Lyman limit, at 912 Å. This wavelength range has been observed only in high luminosity AGNs and most of these objects do not show any signific... | <urn:uuid:aa887f76-4515-4f1e-a31d-525f2f075173> | 2.796875 | 437 | Academic Writing | Science & Tech. | 42.636176 |
A didactic question publish in The Physics Teacher (http://tpt.aapt.org/resource/1/phteah/v41/i1/p8_s1) asks which will melt more ice: 100g of metal at 100C or 100g of wood at 100C. (The particular ...
What is the dominant form of heat transfer between warm water and cold air? If a $100 mg$ drop of water falls through ... | <urn:uuid:f7157ab2-c051-40bf-ae74-90da78df8626> | 3.34375 | 206 | Q&A Forum | Science & Tech. | 80.998324 |
The link between the seasons and the Sun is pretty obvious on a blazing July day: more sunlight means hotter weather. But the link between the amount of sunlight and Earth's climate is a bit more complicated and subtle than that. Changes in the Sun's energy output may create regional or even global changes in Earth's c... | <urn:uuid:f457c554-de90-44c6-99d6-ceab3e98b1ba> | 4.03125 | 322 | Truncated | Science & Tech. | 57.042898 |
Coastal vegetative shingle
What is it?
Shingle is defined as sediment with particle sizes in the range 2-200 mm. It is a globally restricted coastal sediment type with few occurrences outside North West Europe, Japan and New Zealand. Shingle beaches are widely distributed round the coast of the UK, where they develop i... | <urn:uuid:9a41d030-2c97-4a57-8963-456743ae4428> | 3.8125 | 1,561 | Knowledge Article | Science & Tech. | 27.772387 |
Ever wondered how relative humidity affects how hot it really feels outside? Confused about what the dew point is? Learn all about these and other weather terms with our interactive ABC15.com Weather Calculators below.
Related weather definitions from ABC15:
• temperature – the amount of heat or cold measured on a ther... | <urn:uuid:fd038ec0-f0bc-49d8-8e13-234c17b884bc> | 3.859375 | 548 | Tutorial | Science & Tech. | 44.197766 |
What's the Harm?
Invasive plants cause billions of dollars of damage each year to native habitats, wetlands and waterways, crops, and parks and other preserved areas. Some of our most endangered species fight a losing battle with invasive plants to maintain their populations.
Invasive plants can crowd out or even cause... | <urn:uuid:fa25a12f-dead-4cca-b5bf-8bd76bb68d26> | 3.578125 | 295 | Knowledge Article | Science & Tech. | 32.491144 |
Embedding an SQL Database with SQLite
SQLite has an extremely easy-to-use API that requires only three functions with which to execute SQL and retrieve data. It is extensible, allowing the programmer to define custom functions and aggregates in the form of C callbacks. The C API is the foundation for the scripting inte... | <urn:uuid:8b4e57e1-c2ec-4709-9433-315ef65bac85> | 3.28125 | 1,325 | Knowledge Article | Software Dev. | 47.875714 |
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Looking for a great physics site? We've tracked down the very best and checked them for accuracy. Just fill out the fields below and we'll do the rest.
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41 are Websites,
1 is a Videos,
and 0... | <urn:uuid:8340b6fe-5d5d-488f-913a-c7857fa52c7f> | 2.953125 | 297 | Content Listing | Science & Tech. | 61.106892 |
Electric rocket engines known as Hall thrusters, which use a super high-velocity stream of ions to propel a spacecraft in space, have been used successfully onboard many missions for half a century. Erosion of the discharge channels walls, however, has limited their application to the inner solar system. A research tea... | <urn:uuid:173b5802-cc35-437c-925d-146d598ed74c> | 3.59375 | 1,801 | Content Listing | Science & Tech. | 40.188796 |
Mar. 13, 2013 Diving and plunging through the waves to feed, some whales throw their jaws wide and engulf colossal mouthfuls of fish-laden water while other species simply coast along with their mouths agape (ram or skim feeding), yet both feeding styles rely on a remarkable substance in the whales' mouths to filter nu... | <urn:uuid:ae1f6ef4-6c1a-4877-81ad-43071a53e308> | 3.59375 | 885 | Truncated | Science & Tech. | 44.613471 |
The use of web application frameworks by developers has gained a significant market share in the last few years.
These frameworks allow developers to significantly increase their productivity by minimizing the amount of time they spend writing and compiling code. One of the preferred and most exciting web application f... | <urn:uuid:c8815571-f3fa-4628-bf66-1db8415ffb8d> | 3.046875 | 811 | Knowledge Article | Software Dev. | 32.365712 |
A University of Delaware engineer’s solar-powered, hydrogen-producing reactor may solve the energy crisis.
We live in an era that has seen more technological progress than all the centuries before it combined but we are still at the mercy of batteries and hydrocarbons (fossil fuels such as gasoline). (There are already... | <urn:uuid:53b4e859-9814-4bf6-84d1-ce6dd8db2862> | 4.125 | 766 | Personal Blog | Science & Tech. | 40.839505 |
Photosynthesis is a process in plants, algae, and some prokaryotes, that coverts solar insolation into chemical energy stored in glucose or other organic compounds. Photosynthesis occurs in slightly different ways in higher plants relative to photosynthetic bacteria.
|Photosynthesis (Source: Wikimedia Commons)|
Photosy... | <urn:uuid:d9ff77fe-e45e-473a-b3f5-b60b2e59606c> | 3.953125 | 1,481 | Knowledge Article | Science & Tech. | 20.637884 |
Branch of earth science that deals with water as it occurs in the atmosphere, on the surface of the ground, and underground.
California Water-Quality Assessment [ More info] Results of activities in California conducted under the National Water-Quality Assessment Program (NAWQA): maps, publications and data.
California... | <urn:uuid:aa8fd955-405c-4d16-99d0-9b694de1b3a9> | 3.15625 | 607 | Content Listing | Science & Tech. | 22.518192 |
Broadcast meterologists such as Alan Sealls (WKRG, Mobile, Alabama) operate in studios far more technologically advanced than those of a generation ago.
Perhaps nothing about television weather has changed more in the last several decades than the look of it. A typical early-1950s weathercast featured crude hand-drawn ... | <urn:uuid:5a309d6b-7563-4ac8-b6fe-168f6694d8a5> | 2.96875 | 263 | Truncated | Science & Tech. | 22.564923 |
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.
2000 April 14
Explanation: Not all stars form a big Q after they explode. The shape of supernova remnant E0102-72, however, is giving astronomers a ... | <urn:uuid:2cc5cd8d-85c1-4047-8bde-c3e3f357f10f> | 3.328125 | 269 | Knowledge Article | Science & Tech. | 50.901696 |
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.
March 6, 1997
Explanation: Why put observatories in space? Most telescopes are on the ground. On the ground, you can deploy a heavier telescope and ... | <urn:uuid:26029290-ccae-4446-909e-29b8990deb3c> | 3.765625 | 287 | Knowledge Article | Science & Tech. | 47.462292 |
NULL is a concept in SQL databases (exact implementation can vary) that is used to represent unknown, missing or inapplicable data. Normally it is considered to be a state of the data as opposed to the value of the data.
Ordinary equivalence comparisons do not work with
NULL for the above reason. A
field IS NULL as opp... | <urn:uuid:7de8c6da-fd09-43d8-961a-23b2858c94f8> | 2.984375 | 287 | Knowledge Article | Software Dev. | 62.538934 |
Xray Crystallography/Radiation Damage
The problem of radiation damage to crystals, even to cryocooled crystals, has become a major problem again since the advent of the brilliant beam 3rd generation synchrotrons.
Basis of Radiation Damage
It has long been known that radiation damage to proteins is important, in 1962 B... | <urn:uuid:f2f2eec5-dddc-4f1d-8e55-8fc2f0512110> | 3.375 | 881 | Knowledge Article | Science & Tech. | 32.327145 |
Lead, because of its large Z number
, high density and low cost, is a popular shielding material in radiation labs
. It is used to protect the lab and its environment from highly radioactive objects and processes, but it is also used to protect sensitive detectors and counting chambers
from background radiation
. For t... | <urn:uuid:de952b17-28d5-4955-9c0f-bb1d8f68dc15> | 3.703125 | 558 | Personal Blog | Science & Tech. | 42.394238 |
The Cambrian Explosion Never Happened.
Blair and Hedges just published an article where they use molecular clocks to examine the validity of the Cambrian explosion. They conclude, "molecular clocks continue to support a long period of animal evolution before the Cambrian explosion of fossils." Their results indicate th... | <urn:uuid:8605d83e-ebb0-4798-98f0-9d3f987b31e2> | 2.84375 | 688 | Personal Blog | Science & Tech. | 27.366517 |
Select a fraction k between 0 and 1 and mark a length on the hypotenuse that is k times the distance from the end of the segment of length t.
Construct a perpendicular from this point to the segment of length t to construct a similar triangle with sides of length ka, kh, and kt.
Another SIMILAR triangle can be construc... | <urn:uuid:02cc8623-3013-4edd-ac8d-8bf420059a8a> | 3.578125 | 137 | Tutorial | Science & Tech. | 57.415382 |
it's not just for math teachers!
If you like to learn new things and play around with ideas, you're sure to find something intriguing here. Don’t try to read all 40(!) posts at once; take the time to enjoy browsing. Savor a few posts today, and then come back for another helping tomorrow or next week.
At my fortieth bi... | <urn:uuid:7fc88f7b-5b39-411b-a8dc-aa43228fe541> | 3.375 | 1,850 | Personal Blog | Science & Tech. | 61.158559 |
In the deep, sticky jungles of Cameroon lives a rare type of gorilla — one which has been hunted nearly to extinction by indigenous peoples and has never been placed on film.
Until recently, when a camera crew spotted the gorillas hanging out high off the ground in its natural habitat:
“These gorillas are extremely war... | <urn:uuid:5903cc95-8292-4ac9-be80-c9b56056fe43> | 2.6875 | 293 | Personal Blog | Science & Tech. | 36.006632 |
The quark gluon plasma is explored at LHC with the ion experiments there. A description can be found here.
In heavy-ion collisions, the first evidence for jets was seen in 2003 in the STAR and PHENIX experiments at Brookhaven National Laboratory’s Relativistic Heavy Ion Collider (RHIC) in the US. These jets showed a re... | <urn:uuid:90526f19-a2f2-499c-940a-7de335efa5fa> | 3.3125 | 376 | Q&A Forum | Science & Tech. | 32.53827 |
"A novel genetic programming (GP) technique, a new method of evolutionary algorithms, was applied to a small data set to predict the water storage of Wolonghu wetland in response to the climate change in the northeastern part of China. Fourteen years (1993-2006) of annual water storage and climatic data of the wetland ... | <urn:uuid:a7f10097-9572-4a20-a12c-eb1b4363c5fc> | 2.6875 | 203 | Academic Writing | Science & Tech. | 37.217977 |
Guest post from Stephen Wilde:
Greenhouse Gases and the Ideal Gas Law
Stephen Wilde – Jan 2013
This is the usual form of the Ideal Gas Law:
where P is the pressure of the gas, V is the volume of the gas, n is the amount of substance of gas (also known as number of moles), T is the temperature of the gas and R is the id... | <urn:uuid:051a0b5a-9741-4383-bc6f-d8641d1e5061> | 3.53125 | 2,196 | Personal Blog | Science & Tech. | 47.239949 |
In this article I will try to introduce one of the more controversial and interesting to the general public questions in Astrobiology. This is the Fermi Paradox.
Enrico Fermi was a very prominent scientist of the 20th century. He was not very involved in the field of astrobiology (exobiology, as it was called back then... | <urn:uuid:425ec99a-7945-4705-b385-6856168868e7> | 3.03125 | 1,141 | Personal Blog | Science & Tech. | 43.983696 |
A vertical string with weights attached at spacings that correspond to increasing squares (4 inches, 9 inches, 16 inches, etc.) is dropped, either by the demonstrator or a member of the audience. The weights don’t need to be heavy, they just need to make a notable sound when they hit the floor. The sounds of the weight... | <urn:uuid:0b46725b-bb0f-4708-8d2e-d99ae977954a> | 3.8125 | 284 | Tutorial | Science & Tech. | 60.561758 |
|Here is one of the
largest objects that anyone will ever see on the sky.
Each of these fuzzy blobs is a galaxy, together making up the
Perseus Cluster, one of the closest
The cluster is seen through a foreground of faint stars in our own
Milky Way Galaxy.
Near the cluster center, roughly 250 million light-years
away, ... | <urn:uuid:e05ce76f-8bdf-4352-8925-a5ca7fc4b366> | 3.0625 | 199 | Knowledge Article | Science & Tech. | 51.921 |
Conceptual sketch of a Wayland Mk I starship leaving the Solar System
Wayland is a set of design sketches for a manned starship.
These unofficial notes have been produced in parallel with the Icarus project, itself an updating of the Daedalus project of the 1970s. Daedalus produced a detailed design for a robotic probe... | <urn:uuid:d505cf76-711c-44e4-af6f-f2b60a65117e> | 2.828125 | 632 | Personal Blog | Science & Tech. | 34.203568 |
What are "currents"?
Is it true that sand piles up on the bottom of the ocean only 1 centimeter every 1000 years?
What’s the difference between the current and the tide?
What is a warm water current?
How do whirlpools form?
What is a riptide?
What is a whirlpool?
What are upwellings?
Why do hurricanes hit Florida a lot... | <urn:uuid:a621355e-83a2-4e8b-9944-52607207c4dd> | 2.953125 | 185 | Q&A Forum | Science & Tech. | 77.325981 |
Part 1 - Setup
Each student must complete this section before working with any chemicals in this lab.
|my partner is:||_________________________|
|name of compound:||_________________________|
|volume of solution to make:||_________________________||_____|
|chemical formula for compound:||_________________________|
|mo... | <urn:uuid:1136a5d2-eb41-4ca9-8db3-8cdfe586a10f> | 3.734375 | 401 | Tutorial | Science & Tech. | 54.592719 |
Definitions for magnetic azimuth
The Standard Electrical Dictionary
The angle, measured on a horizontal circle, between the magnetic meridian and a great circle of the earth passing through the observer and any observed body. It is the astronomical azimuth of a body referred to the magnetic meridian and therefore subje... | <urn:uuid:9c8b8246-e968-495b-8d5a-3530c34eb5e3> | 3.25 | 140 | Structured Data | Science & Tech. | 40.285899 |
A new study by engineering researchers at Rensselaer Polytechnic Institute demonstrates how introducing certain polymers—like those found in human mucus and saliva—into the environment makes it significantly more difficult for H. pylori and other microorganisms to coordinate.
“In the human body, microorganisms are alwa... | <urn:uuid:50d07b82-9a3c-4870-8ebc-1c835e407e97> | 3.15625 | 217 | Truncated | Science & Tech. | 30.069778 |
Even prior to the oil spill, decades of over-harvesting, disease, pollution and declining habitat have decimated the massive oyster reefs that once dominated the country’s coastal estuaries. Globally, 85 percent of reefs have been lost, making oyster reefs the most severely impacted marine habitat on Earth.
Because oys... | <urn:uuid:c0b9244d-5f4a-4ef0-8cd2-e73f7ab757e3> | 4.03125 | 1,203 | Knowledge Article | Science & Tech. | 33.016101 |
Future Earth Prosperity Will Depend on Resources in Space
By Mark Hopkins
THE LATE PRINCETON PHYSICS PROFESSOR GERARD O'NEILL first published his ideas concerning the construction of space settlements in a now classic Physics Today article in 1974. His ideas led to the establishment of the L5 Society, which in 1987 mer... | <urn:uuid:96694086-c40b-453b-b50a-107a71cc2acf> | 4.03125 | 795 | Nonfiction Writing | Science & Tech. | 48.94366 |
In honour of the hundredth anniversary of Einstein\'s \'miraculous year\', I will describe the modern view of space and time. I will start with special relativity, then describe how space and time are modified in Einstein\'s general theory of relativity, and end with recent ideas coming out of string theory. In all cas... | <urn:uuid:816fdd7a-5a98-4744-add5-c336157c466e> | 3.390625 | 351 | Truncated | Science & Tech. | 31.484454 |
IN PHYSICS I OFTEN GET STRUCK OF A QUESTION OF NOT A SINGLE TEACHER OR MY FRIENDS COULD ANSWER ME THE QUESTION IS THAT
“IF SPEED OF LIGHT IS 3 x 108 METRE PER SEC, THAN WHAT IS THE SPEED OF DARKNESS????….”
Asked Taoqeer Nezam
Can you see your image when you are travelling at the speed of light?
Visitors and students ar... | <urn:uuid:b65e75d9-cf44-4119-83df-1077124b8e3e> | 3.34375 | 1,329 | Q&A Forum | Science & Tech. | 42.711114 |
“We ‘killed’ five people to make No Pressure – a mere blip compared to the 300,000 real people who now die each year from climate change,”
The message from the child snuff film makers being that it is OK to kill children of your choice – if you believe their deaths are for the greater good. (See Germany, 1939)
So let’s... | <urn:uuid:db807b5e-fdc9-4c39-b6db-15c344880306> | 2.890625 | 409 | Nonfiction Writing | Science & Tech. | 69.258938 |
Dennis Tito’s 500-Day Mission to Mars – the Orbital Mechanics
You'll all have heard of Dennis Tito's idea about sending a manned mission to Mars that would take 500 days (well, 501, actually). Launched in January 2018, a small manned spacecraft would fly to Mars, skim past the red planet and use its gravity to send it ... | <urn:uuid:423baac9-fbaf-40de-afee-50023558b581> | 2.8125 | 1,309 | Personal Blog | Science & Tech. | 58.173599 |
Exploding Chromosomes Fuel Research About Evolution
Chicago IL (SPX) Aug 26, 2008
Human cells somehow squeeze two meters of double-stranded DNA into the space of a typical chromosome, a package 10,000 times smaller than the volume of genetic material it contains.
"It is like compacting your entire wardrobe into a shoeb... | <urn:uuid:5abb3244-176f-4575-9841-58f0cba5c251> | 3.34375 | 1,100 | Truncated | Science & Tech. | 20.918622 |
Genetics and Genomics Glossary
The following glossary was obtained with permission from the following resource: Allendorf, F.W., and G. Luikart. 2007. Conservation and the Genetics of Populations. Blackwell Publishing. 642 pp.
The principle that the least complicated explanation (most parsimonious hypothesis) generally... | <urn:uuid:3fe1730b-607b-4534-99d9-6243b1da8788> | 2.796875 | 203 | Structured Data | Science & Tech. | 39.244381 |
During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well. The level of atmospheric greenhouse gases continues to increase, now over 120 ppm since the Industrial Revolution began. For mo... | <urn:uuid:cfe448ba-9ced-49af-bd1c-cc46f9b43995> | 2.953125 | 497 | Content Listing | Science & Tech. | 58.605864 |
- Scope of the Challenge
- Strengths and Weaknesses
- U.S. Climate Change Policy Issues
- Recent Developments
- Options for Strengthening the Climate Change Regime
Climate change is one of the most significant threats facing the world today. According to the American Meteorological Society, there is a 90 percent probab... | <urn:uuid:5ff86e93-b5f7-4a44-b942-27678857ccec> | 3.390625 | 335 | Knowledge Article | Science & Tech. | 25.597961 |
|Start of Tutorial > Start of Trail > Start of Lesson||
The basic format of the command for creating a JAR file is:Let's look at the options and arguments used in this command:jar cf jar-file input-file(s)
- The c option indicates that you want to create a JAR file.
- The f option indicates that you want the output to ... | <urn:uuid:b37d229c-b9cb-4e3a-b0bb-3b5909c2c73d> | 3.40625 | 1,698 | Tutorial | Software Dev. | 59.703906 |
Previous Next Edit Rename Undo Search Administration
Function String ( Source As String [ , Level As Integer, AllowGrow As Boolean ] ) As String
This function returns a string compressed using the algorithm defined by the Type Vetia
- Source: string to be compressed.
- Level: compression level, a value from Min value t... | <urn:uuid:6d1ef82f-0c0e-4894-87d2-e8a7e4f7b8c2> | 2.953125 | 253 | Documentation | Software Dev. | 55.240227 |
Data modeling is the science (and art) of creating the database schema that most purely matches the real world objects involved in your project. Part of this is defining how the objects relate to one another. Let’s say your application tracks Items and Categories. If each item can only belong to one category, then you ... | <urn:uuid:1e163c0d-67ae-4bf9-97ec-8b8cb6fb34a3> | 3.34375 | 1,086 | Tutorial | Software Dev. | 37.797023 |
4th March 2007 - 11:13 AM
I was trying to solve a problem of motion with mass changing along the way , such as in rocket : gas is going down and gaining mass while the rocket lose mass and going up.
Lets call the rocket #1 and the gas #2.
Lets say the derivative of M1 , the velocity of the gas relating to the rocket V0... | <urn:uuid:e952cd7b-8ea4-4ad3-9b34-87b51699c6cc> | 3.0625 | 1,133 | Comment Section | Science & Tech. | 79.193632 |
Table of Contents:
Beckman, P. A History of Pi. New York: Dorset. 1989.
Bell, E. T. Men of Mathematics. New York: Simon & Schuster. 1986.
Boyer, C. B. A history of mathematics. New York, Wiley. 1968.
Dorrie, Heinrich. 100 great problems of elementary mathematics: their history and solution. New York: Dover. 1965.
Eves,... | <urn:uuid:b090e389-b70d-4b3f-a560-06b3e18d5a50> | 3.234375 | 264 | Content Listing | Science & Tech. | 68.231092 |
Modular Exponentiation by Repeated Squaring
Hello, I have the following problem:
Suppose we are given and exponents where the binary length of the is at most . Show how to compute using at most squarings and multiplications.
Just in case: if the binary length of is , using repeated squaring to compute uses at most squa... | <urn:uuid:f1b910d6-9331-4712-8aac-91f263d20111> | 2.71875 | 219 | Q&A Forum | Science & Tech. | 46.888333 |
15 Answers votes newest views recent 3analogue of a set with n binary operations 0Euclidean inside Hyperbolic 2Time scale calculus vs Lebesgue–Stieltjes calculus 4What are some examples of colorful language in serious mathematics papers? 3Proofs that require fundamentally new ways of thinking 5More open problems 2Sugge... | <urn:uuid:c5798a19-f022-4151-b0ba-15a21f66d468> | 2.8125 | 172 | Q&A Forum | Science & Tech. | 22.262529 |
Explore the effect of reflecting in two intersecting mirror lines.
Explore the effect of reflecting in two parallel mirror lines.
Explore the effect of combining enlargements.
A red square and a blue square overlap so that the corner of the red square rests on the centre of the blue square. Show that, whatever the orie... | <urn:uuid:3ba9d42e-0073-4076-9685-41d6152feacd> | 4.21875 | 1,532 | Content Listing | Science & Tech. | 73.036803 |
T-79: Taking Titan's Temperature
The composite infrared spectrometer (CIRS) got prime time during the Titan ‘T-79’ flyby on Dec. 13, 2011, a day after the Cassini spacecraft visited Dione.
CIRS performed a wide variety of observations, including mapping of surface and atmospheric temperatures. It also took “limb soundi... | <urn:uuid:620b3348-175c-4c43-a006-fc1e4500a98b> | 3.109375 | 248 | Knowledge Article | Science & Tech. | 23.957273 |
The Miconia plant has taken root on an island far from its origins in native Mexico. The islands of Hawai’i are the unlucky recipients of the Miconia, a plant that seems determined to take over the vegetation of the tropic islands. It was first transported from Mexico as a decorative plant, considered beautiful because... | <urn:uuid:4d2d15bc-0d56-4c07-bf2e-0bf3ad04d6c4> | 3.90625 | 595 | Personal Blog | Science & Tech. | 34.980667 |
Guest post by Clive Best
Perhaps like me you have wondered why “global warming” is always measured using temperature “anomalies” rather than by directly measuring the absolute temperatures ?
Why can’t we simply average the surface station data together to get one global temperature for the Earth each year ? The main ar... | <urn:uuid:ddb1fc29-feed-43f5-a785-dde65258abb9> | 3.515625 | 1,132 | Personal Blog | Science & Tech. | 32.524024 |
Author: Scott Salom
Dr. Lee Humble, a scientist with the Canadian Forest Service in British Columbia who searches for natural enemies of HWA and the balsam woolly adelgid, observed that the small, little-known beetle, Laricobius nigrinus Fender (Coleoptera: Derodontidae), consistently feeds on HWA in western hemlock se... | <urn:uuid:6f50f5a8-5833-4aa0-b2ed-a72437d492c1> | 3.109375 | 876 | Knowledge Article | Science & Tech. | 50.35046 |
|Science Home News in Science Features Explore TV & Radio Dr Karl Play Podcasts|
Uranus, the 7th planet out from the Sun was discovered accidentally in 1781 when William Herschel was trying out the 7" telescope that he had built. It is barely visible to the naked eye, but through a telescope it looks like a blue-green ... | <urn:uuid:7ae535ba-7f22-48dd-b890-dadd834ae117> | 3.640625 | 515 | Knowledge Article | Science & Tech. | 64.407719 |
Science subject and location tags
Articles, documents and multimedia from ABC Science
Wednesday, 17 April 2013
Astronomers have found a mysterious new type of the most powerful explosions in the universe since the Big Bang.
Thursday, 14 March 2013
Distant starburst galaxies were more numerous and forming stars far earl... | <urn:uuid:90c9b73e-ad93-4413-bea2-cf566310140d> | 3.015625 | 486 | Content Listing | Science & Tech. | 39.725694 |
In the North Atlantic, Oceanic Currents Play a Greater Role in the Absorption of Carbon Than Previously Thought
ScienceDaily (Mar. 9, 2011) — The ocean traps carbon through two principal mechanisms: a biological pump and a physical pump linked to oceanic currents. A team of researchers from CNRS, IRD, the Muséum Nation... | <urn:uuid:c61cae0e-c779-40cd-a448-1108b029b771> | 3.765625 | 587 | Truncated | Science & Tech. | 37.004713 |
Program in Modeling and Decision Support
Capability/Technical Service - Empirical and simulation modeling.
Conserving populations of sensitive aquatic species often requires a better understanding of the anthropogenic and natural factors (ecological context) that affect persistence. Often, basic empirical data are lack... | <urn:uuid:10b8a89e-a94d-4ac9-a960-290ea6c0c190> | 2.765625 | 1,267 | Academic Writing | Science & Tech. | 25.386497 |
<electronics> The absence of an electron in a semiconductor material. In
the electron model, a hole can be thought of as an incomplete outer electron
shell in a doping substance. Holes can also be thought of as positive charge
carriers; while this is in a sense a fiction, it is a useful abstraction.
HOL « HOL-88 « HOL-... | <urn:uuid:b16ea339-3f98-47b5-b79e-3d8307166244> | 2.984375 | 98 | Structured Data | Science & Tech. | 33.864872 |
A REMOTE region of Antarctica has yielded what may be the best-preserved comet dust yet found, perhaps in better condition than the samples NASA's Stardust mission brought back from a comet's tail.
A team of meteorite experts led by Jean Duprat of the University of Paris South, France, found the dust in snow collected ... | <urn:uuid:96443134-1f09-4bd5-a512-6282628411e1> | 3.890625 | 215 | Truncated | Science & Tech. | 50.009558 |
Crystal moss animal
Colonies can reach up to 1cm in diameter and collectively cover large areas of substratum when growing conditions are favourable.
Growth occurs by budding of new zooids.
Colonies can divide and slowly glide apart to form new daughter colonies.
Unusually for freshwater bryozoans, L. crystallinus is c... | <urn:uuid:46ee3035-3a08-4d5d-993d-2bfc3613e8cd> | 3.609375 | 216 | Knowledge Article | Science & Tech. | 30.102673 |
The Monterey Accelerated Research System (MARS) is part of the the Monterey Ocean Observing System (MOOS) ocean initiative developed at the Monterey Bay Aquarium Research Institute (MBARI). MBARI was an inaugural member of the University of Washington-led partnership known as NEPTUNE that was formed in 2000 with the go... | <urn:uuid:1e745a4b-a350-4ee5-892b-c9b70d6558c7> | 3.359375 | 426 | Knowledge Article | Science & Tech. | 24.711613 |
The final shuttle launch has been getting so much last minute attention one would think that the 130+ that came before were widely covered, too. Not so. Except for the first few and the two tragic disasters, the media has been loosing interest for years. And I guess so has the space industry.
The shuttle is like a came... | <urn:uuid:effc65e4-7875-4e29-a7de-b5b3cc616005> | 3.03125 | 323 | Personal Blog | Science & Tech. | 66.554719 |