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Metals and acids
Many, but not all, metals react with acids. Hydrogen gas forms as the metals react with the acid to form salts. This is a well-tried standard class experiment often used in the introductory study of acids to establish that this behaviour is a characteristic property of acids.
The experiment is done fir... | <urn:uuid:2fcca0e9-6416-4c02-aec5-85301ec5884a> | 4.1875 | 2,233 | Tutorial | Science & Tech. | 52.275613 |
This Example shows how to create an empty DOM Document . JAXP (Java API for XML Processing) is an interface which provides parsing of xml documents. Here the Document BuilderFactory is used to create new DOM parsers. There are some of the methods used in code given below for creating an empty DOM Document :-
DocumentBu... | <urn:uuid:39dd6ece-2e4a-46cc-bdc9-8bb35b0c1111> | 3.40625 | 255 | Documentation | Software Dev. | 30.46943 |
The SAGE III instrument operates by measuring the amount of solar light as it passes through the limb or edge of the Earths atmosphere as the spacecraft views the rising and setting of the sun during each orbit. The instrument measures light at wavelenghts in the part of the electromagnetic spectrum visible to the huma... | <urn:uuid:dac3de57-4b55-4595-8403-433c52a5343f> | 3.796875 | 160 | Knowledge Article | Science & Tech. | 21.224059 |
Stephen James O'Meara's Secret Sky: Measure the Moon
March 2010: Don't let psychological tricks fool you when determining the Moon's size.
January 25, 2010
|In my January column, I challenged readers to look for some of the finest naked-eye features on the Moon during lunar perigee — when the Moon is closest to Earth i... | <urn:uuid:8fb53fad-1330-4216-b74f-87ac5727921e> | 3.59375 | 1,716 | Nonfiction Writing | Science & Tech. | 61.247125 |
'The Nymphalidae are members
of the Superfamily
Papilionoidea, the true butterflies. Distributed worldwide, butterflies of this family
are especially rich in the tropics. They are highly variable, and there are more species in this family than in any other. Adults
vary in size from small to large, and their front legs
... | <urn:uuid:885978b4-09c2-4476-aa31-26cf1edadc32> | 3.6875 | 1,040 | Knowledge Article | Science & Tech. | 41.940713 |
Tornadoes are rare at any one location, but out of anywhere in the United States, the central Oklahoma area has the greatest risk—and this day would prove no exception.
Can shifting tides trigger earthquakes? Research done by Maya Tolstoy, a geophysicist at Lamont-Doherty Earth Observatory, suggests they do.
Every indi... | <urn:uuid:c7b2a2e6-7f50-487a-ac94-63cb544b0697> | 2.859375 | 622 | Content Listing | Science & Tech. | 34.397429 |
Count some birds, shoot a wave, set out a rain gauge — the sky’s the limit
Today is the first day of the annual Great Backyard Bird Count, when people all over North America tally the birds they see and record their results on the GBBC website. It’s a simple citizen science project to try. Even if you don’t know your b... | <urn:uuid:6807e630-f5bd-44ff-8886-650369341690> | 3.515625 | 269 | Personal Blog | Science & Tech. | 67.353006 |
A constructive proof demonstrates the existence of a mathematical function, number or object by producing (constructing) it. This is in contrast with other styles of proof, such as proof by contradiction, which asserts the existence of an object by finding a contradiction if it did not exist. Such a proof is called non... | <urn:uuid:21464423-4405-46d5-8e0b-20704eebffa8> | 3.5625 | 238 | Knowledge Article | Science & Tech. | 27.553 |
This module implements the interface to NIST's secure hash
algorithm, known as SHA. It is used in
the same way as the md5 module: use new()
to create an sha object, then feed this object with arbitrary strings
using the update() method, and at any point you can ask it
for the digest of the concatenation of the strings ... | <urn:uuid:4b2149fb-f341-45f6-8f46-04478b023f7d> | 2.8125 | 375 | Documentation | Software Dev. | 62.031111 |
The forest, woodlands, shrublands, and heath of Southwest Australia are characterized by high endemism among plants and reptiles. Its unique vertebrate species include the numbat, honey possum, and the red-capped parrot. The western swamp turtle, which hibernates for nearly eight months of the year in response to dry c... | <urn:uuid:5447067d-524e-4a55-aca9-51969e8767e6> | 3.796875 | 146 | Knowledge Article | Science & Tech. | 25.624579 |
© Mike Matthews, JILA.
Atomic physics experiments routinely trap clouds of atoms, as described in Unit 5, but the atoms in these gas clouds are all distinct entities with separate quantum mechanical wavefunctions. This unit will describe how it is possible for the wavefunctions of all the atoms to merge into a single, ... | <urn:uuid:6b1382c5-cc9a-4f6e-9765-e5be55a0f46f> | 3.75 | 209 | Truncated | Science & Tech. | 40.948603 |
This site is full of cool facts. You will learn about physical change, chemical change, and what the science of food is. You will also be learning about protons, electrons, neutrons, and atoms. You may think this has nothing to do with food, but guess what, it has a lot to do with food.
Chemical change is when you chan... | <urn:uuid:8f93f429-4615-4311-bc15-85aebc98e28a> | 3.296875 | 261 | Knowledge Article | Science & Tech. | 76.979917 |
Simple math. Example: If there are 100,000,000 first generation spring migrants in the wild, very roughly around 5% (5,000,000) of them will be in Minnesota in May. If butterfly breeders ship around 300,000 adults and caterpillars per year for release, mostly in April-October, that’s only a maximum of 50,000 per month.... | <urn:uuid:d0753f00-90aa-421c-b7a2-78b3db01fa9e> | 3.484375 | 192 | Comment Section | Science & Tech. | 69.266939 |
Bacteria and Locomotion
Country: United States
Date: January 2008
Why do bacterium move not how but why? is it just to transfer?
Usually, it's to find better conditions for them to live – perhaps it
might be for food, for oxygen (or to get away from oxygen), for light,
or for nutrients. Bacteria can sense chemical grad... | <urn:uuid:ba686990-dc84-4a43-bb17-db4739f29284> | 3.328125 | 193 | Knowledge Article | Science & Tech. | 49.044198 |
Differential Equation (ODE) are among the most important mathematical
quantity used in engineering analysis.
They are used across the discipline for design
and simulation. The term "ordinary"
is used for mathematical quantities that are a
function of a single variable - velocity is a function
of time, pressure is a fun... | <urn:uuid:f9dfc551-41e2-4659-a2f5-9190e2d8e99f> | 3.703125 | 682 | Tutorial | Science & Tech. | 31.456393 |
Hubble, as well as numerous other professional telescopes, use the Ritchey–Chrétien design. What optical and instrumental advantages does this kind of telescope have for professional astronomy?
I think the first sentence from the Wikipedia article on Ritchey–Chrétien telescopes is one of the major compelling reasons:
E... | <urn:uuid:b3d323db-031d-4c19-bd7e-011e8e52d7dd> | 2.84375 | 333 | Q&A Forum | Science & Tech. | 36.031625 |
I know that's stupid question, but I'm really confused what my teachers says, so I need to check that theory. Here are just two ordinary connected containers, which are full of water. On grounds ...
When you fill a glass with water, water forms a concave meniscus with constant contact angle $\theta$ (typically $\theta=... | <urn:uuid:b94c69e4-2ec4-40ba-8e93-22e026ff09b7> | 2.953125 | 191 | Q&A Forum | Science & Tech. | 80.333727 |
Photo courtesy of NBC4 Washington
Yes and no. It depends on what type of prediction you're looking for. If you're willing to settle for predictions of the near future and can tolerate predictions in terms of probabilities, the goal is already at hand. But if you want definitive, long-range predictions of the precise we... | <urn:uuid:f0e839a3-27f4-47cb-9220-ca01db99aedc> | 2.84375 | 418 | Q&A Forum | Science & Tech. | 40.002974 |
Friday, June 20, 2008
Although we have been enjoying summer heat for nearly a month... technically it won't we summer until 7:59 tonight! That is when the sun will ascend to its highest latitude (Tropic of Cancer, 23.5 degrees north latitude) on the celestial sphere making today the longest day of the year in the north... | <urn:uuid:31ae74f6-61b9-437e-8431-fb0fa9319086> | 3.078125 | 1,178 | Personal Blog | Science & Tech. | 65.832991 |
Interfacing to GCC Output
GCC is normally configured to use the same function calling
convention normally in use on the target system. This is done with the
machine-description macros described ( Target Macros.).
However, returning of structure and union values is done differently
on some target machines. As a result, ... | <urn:uuid:bfa9d0d6-765e-4966-b5bd-08aa7ec36ba5> | 3.359375 | 999 | Documentation | Software Dev. | 45.107023 |
Science Fair Project Encyclopedia
Two dimensional gel electrophoresis
Two dimensional gel electrophoresis, commonly abbreviated as 2-DE or 2-D electrophoresis, is a form of gel electrophoresis commonly used to analyze proteins. In 1-D electrophoresis, proteins (or other analytes) are separated in one dimension, so that... | <urn:uuid:1bdd8985-3371-465d-8ea9-c2b4cd565ed0> | 3.671875 | 778 | Knowledge Article | Science & Tech. | 41.269173 |
The Arctic’s frozen waters have entered a radically new state.
How a deep-drilling experiment is fighting climate change.
Scientists analyze ancient glaciers to understand climate change today.
Drought stressed the groundwater stores of the southern United States in 2011 and 2012.
In 2010, El Niño switched quickly to a... | <urn:uuid:814d0e34-64a0-47bb-900f-c7db3e0b0d38> | 3.109375 | 158 | Content Listing | Science & Tech. | 46.884231 |
A 295 kg piano slides 4.5 m down a 30° incline and is kept from
accelerating by a man who is pushing back on it parallel to the
incline (Fig. 6-36). The effective coefficient of kinetic friction
is 0.40. I have tried for over 4 hours to get this problem right,
but no luck. I am
willing to give MAX Karma points to anyon... | <urn:uuid:f8c35e22-6992-4961-8527-838a27a5907d> | 2.859375 | 183 | Q&A Forum | Science & Tech. | 84.752692 |
The basic indentation command is <TAB>
indent-for-tab-command), which was documented in
Indentation. In programming language modes, <TAB> indents
the current line, based on the indentation and syntactic content of
the preceding lines; if the region is active, <TAB> indents each
line within the region, not just the curr... | <urn:uuid:c6175052-2408-4854-871c-88fa09ade7c4> | 3.5625 | 288 | Documentation | Software Dev. | 39.037067 |
...making Linux just a little more fun!
In the last article we saw some of the basic GCC options, and noted that it supports several CPU architectures. One of the topics we will cover in this article is how to turn on optimizations for different architectures and what happens when they are turned on. We will also look ... | <urn:uuid:e3b0f3ff-d9ae-4db1-b38b-fb9b4adf06c4> | 3.453125 | 2,001 | Personal Blog | Software Dev. | 56.650997 |
This approach predicted the design of alloys with roughly half the stiffness of current implants — promising to reduce pain for the millions of patients who receive hip transplants each year. It also opens opportunities for theory-guided design of future biomedical products.
Soft materials form organized systems at sca... | <urn:uuid:794c8675-4a1d-4fa1-a21d-d782985d740b> | 3.046875 | 448 | Knowledge Article | Science & Tech. | 28.355195 |
Episode 537: Preparation for the Deep Scattering and Quarks Topics
From the Institute of Physics, this topic gives clear evidence for the size of the nucleus and for the fact that nucleons are not fundamental particles but contain different parts. This leads onto Gell-Mann and Zweig’s quark model.
The learning episodes... | <urn:uuid:faf44bec-284d-4c2b-b310-9074c4b83c5c> | 4.15625 | 342 | Tutorial | Science & Tech. | 41.043971 |
Search our database of handpicked sites
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At more than 200 times sun’s mass, this giant sets a new record.
Found in: Astronomy and Atom & Cosmos
BLOG: A study showing a genetic basis for exceptionally long life in humans has come under fire from critics. (p. 10)
Found in: Body & Brain and Genes & Cells
The Rosetta orbiter makes its second swing past a relic of... | <urn:uuid:4a1b824c-df23-40df-8e54-b1cec7fbf808> | 3.0625 | 597 | Content Listing | Science & Tech. | 44.568942 |
The EPA has listed the Ventura River as an "impaired water body" for a variety of problems, including trash, bacteria, water diversion and pumping, and pesticides (DDT/PCBs). The Clean Water Act requires that government take action to solve the problems to ensure the river is fishable and swimable. The regulatory mecha... | <urn:uuid:fd7bc1cb-4298-4712-8d3a-384c8c14cdc8> | 3.484375 | 539 | Knowledge Article | Science & Tech. | 30.025 |
(1) In programming, a symbol or number used to identify an element in an array. Usually, the subscript is placed in brackets following the array name. For example, AR identifies element number 5 in an array called AR.
If the array is multidimensional, you must specify a subscript for each dimension. For example, MD ide... | <urn:uuid:49a7f8e3-e20f-4dcf-a2da-1a240797aa13> | 3.46875 | 80 | Structured Data | Software Dev. | 44.471125 |
Reprogrammed stem cells on Dipity.
Babies can be anything when they grow up, but it's a lot harder for a 45-year-old accountant to start a new life as a firefighter. Likewise, embryonic stem cells can become any kind of cell in the human body, but it's another thing entirely to force a specialized adult cell out of its... | <urn:uuid:687e4238-d466-46de-b18e-efdeb2ef4ac8> | 3.203125 | 733 | Personal Blog | Science & Tech. | 52.382733 |
Modern molecular phylogenetics, in conjunction with sensitive mineral surface geochemical analysis, was used to determine the quantitative and qualitative distribution of micro-organism in Dry Valley soils, the key environmental factors that determine microbial distribution and what the role of micro-organism in commun... | <urn:uuid:fab97332-37e4-4907-a25a-08c3cabab130> | 3.171875 | 569 | Academic Writing | Science & Tech. | 26.411957 |
Census of Antarctic Marine Life (CAML) Archive of Project DocumentationEntry ID: CAML_Project_Archive.Media_Education_Outreach
Abstract: The Census of Antarctic Marine Life (CAML) Project Archive is a collection of scanned documents, maps, videos, and other related material that comprise the organisation and management... | <urn:uuid:683e367e-dfe7-40b1-aa8a-341f87ee7936> | 2.6875 | 445 | Content Listing | Science & Tech. | 34.414149 |
||Reinforcement Learning and
Information and Resources
The ambition of this
page is to provide information and links for using Python.
Python Documentation, Tutorials and General Information
Tkinter (Python version of tk) (GUI)
Introduction to Tkinter (html)
- Also check the Python books; Tkinter has been the default G... | <urn:uuid:f32c00bb-0bf4-43ec-9edd-0cb1d810ce5b> | 2.875 | 1,154 | Tutorial | Software Dev. | 61.611065 |
Laws of Source Code and Software Development
I’ve worked in a variety of projects, in a myriad of languages, and have learned the following universal truths about software development the hard way.
- Commented out code are not comments – Use version control, don’t track code changes by commenting them out. Commented ou... | <urn:uuid:4ce0c887-a79c-4d83-824c-c21a21a24ab1> | 2.8125 | 725 | Listicle | Software Dev. | 51.357138 |
Auto-Implemented Properties (Visual Basic)
Auto-implemented properties enable you to quickly specify a property of a class without having to write code to Get and Set the property. When you write code for an auto-implemented property, the Visual Basic compiler automatically creates a private field to store the property... | <urn:uuid:f6392b81-89eb-4689-bb2c-a0a02a42a11d> | 3.296875 | 887 | Documentation | Software Dev. | 27.645722 |
Luiz Rocha, the curator of ichthyology at the California Academy of Sciences, writes from Belize, where he conducts research on the social wrasse, one of the world’s most endangered fish.
Tuesday, Dec. 17
The weather is much better, and we were able to do several dives and get a good grasp on just how bad the lionfish ... | <urn:uuid:efb1cf4f-0536-4e5e-8395-ce499a1fa21c> | 2.84375 | 693 | Personal Blog | Science & Tech. | 49.480097 |
Let's be honest, some mammals look bizarre - giant teeth, deadly feet, skin covered in everything from piercing quills to impenetrable plates of bony armor, and six-foot long hands.
Despite our differences, all mammals inherited the same basic body features - some type of hair or fur; backbones; and mammary glands, amo... | <urn:uuid:44688fc4-4f52-45fc-8ca8-f9584d1ceee9> | 3.984375 | 432 | Knowledge Article | Science & Tech. | 53.85351 |
Earth Sciences: Year In Review 2012Article Free Pass
Heat persisted over a vast area of the U.S. in 2012. Across the contiguous states, 2011–12 saw the fourth mildest meteorological winter (December–February) in 118 years of record keeping, with the third smallest snow cover. The unusually warm winter heralded the warm... | <urn:uuid:5ce70066-70a3-488d-a95e-a007178652e0> | 3.640625 | 1,204 | Knowledge Article | Science & Tech. | 54.044308 |
Simply begin typing or use the editing tools above to add to this article.
Once you are finished and click submit, your modifications will be sent to our editors for review.
Pogonophorans were first classified as a distinct phylum in the middle of the 20th century. The first species, Siboglinum weberi, described in 191... | <urn:uuid:3084ba60-be90-47ee-91e4-08589250533a> | 3.015625 | 161 | Knowledge Article | Science & Tech. | 49.174872 |
Sciurus niger, the eastern fox squirrel, is the largest tree squirrel in North America. Squirrels are interesting in that their skulls are highly conserved, having changed little since the oldest-known squirrel (Protosciurus) appeared in the late Oligocene. This can be easily seen by comparing Sciurus to Cynomys ludovi... | <urn:uuid:8cad3c8a-8bf9-4659-ae1d-8e26d4aa86be> | 3.015625 | 683 | Knowledge Article | Science & Tech. | 50.893199 |
||This article needs additional citations for verification. (July 2009)|
Half-life (t½) is the time required for a quantity to fall to half its value as measured at the beginning of the time period. In physics, it is typically used to describe a property of radioactive decay, but may be used to describe any quantity wh... | <urn:uuid:282fa41a-298d-476c-bfe2-b689e74d837c> | 3.84375 | 2,151 | Knowledge Article | Science & Tech. | 39.649331 |
The proposed mechanism for increased amounts of the sun's geomagnetic activity having an impact on the Earth's Climate is quite complicated, since there are many ways in which the sun can impact the climate.
One of the most famous ways is with the reduction in Cosmic Rays reaching Earth. The reduction in Cosmic Rays cr... | <urn:uuid:08819b34-8b64-4b30-929c-6a2dde184d66> | 3.828125 | 1,804 | Comment Section | Science & Tech. | 40.912163 |
fluid mechanics, branch of mechanics dealing with the properties and behavior of fluids, i.e., liquids and gases. Because of their ability to flow, liquids and gases have many properties in common not shared by solids. The special study of fluids in motion, or fluid dynamics, makes up the larger part of fluid mechanics... | <urn:uuid:6ae17013-8572-427a-b5b3-2472fc5418e4> | 3.546875 | 220 | Knowledge Article | Science & Tech. | 38.358168 |
Learn math by playing with it!
In math class, which is the most common delivery method for the math questions you need to do?
On the board
Votes so far: 1181
Easy to understand algebra lessons on DVD. Try before you commit. More info:
Solve your algebra problem step by step!
Online Algebra Solver »
Share this page.
A M... | <urn:uuid:bcd8e7f5-99f7-4830-90f6-4de08ad42551> | 2.953125 | 213 | Content Listing | Science & Tech. | 66.707784 |
1. Gravity is an invisible force that occurs between two objects.
2. The reason things stay on the Earth’s surface is because of the gravitational pull toward the Earth’s center.
3. Gravity is also the reason the Earth spins around the sun.
4. The bigger the object's mass the more gravity it will have, and the smaller ... | <urn:uuid:6e9e4fd1-7149-4f1a-a45a-6ceac2a32866> | 3.5625 | 227 | Listicle | Science & Tech. | 69.97587 |
Oh, to catch a rainbow. Well, it's been done for the first time ever – and with just a simple lens and a plate of glass at that. The technique could be used to store information using light, a boon for optical computing and telecommunications.
All-optical computing devices promise to be faster and more efficient than c... | <urn:uuid:7b634f66-2a2e-4b8a-8f14-42effa78f84c> | 4 | 1,514 | Comment Section | Science & Tech. | 65.458352 |
Element 106 finally has a name, twenty years after its discovery. The name - seaborgium (or Sg) - was announced on Sunday at a meeting of the American Chemical Society in San Diego. It was chosen in honour of Nobel laureate Glenn Seaborg, co-discoverer of plutonium and nine other 'transuranic elements': americium, curi... | <urn:uuid:36902ff6-e16b-4d04-a77a-383e798f2db1> | 3.3125 | 237 | Truncated | Science & Tech. | 27.21125 |
The same material that formed the first primitive transistors more than 60 years ago can apparently be modified in a new way to advance future electronics.
French scientists have combined two materials with advantageous electronic properties - graphene and molybdenite - into a flash memory prototype that offers signifi... | <urn:uuid:88fe732b-4f1c-43c9-be12-d1c78fe6ccf1> | 3.546875 | 638 | Content Listing | Science & Tech. | 22.75597 |
Study addresses questions and concerns related to limited sand resources along the Louisiana shelf and their implications to long-term relative sea-level rise and storm impacts, using newly acquired geophysical and vibracore data.
USGS project to understand coastal evolution and modern beach behavior; to identify and m... | <urn:uuid:6ed66469-9981-4edc-a5dc-07273be1e6cf> | 3.125 | 214 | Content Listing | Science & Tech. | 25.633746 |
Permitted Context: %Body.Content
Content Model: %text
HTML defines six levels of headings. A heading element implies all
the font changes, paragraph breaks before and after, and any white
space necessary to render the heading. The heading elements are H1, H2,
H3, H4, H5, and H6 with H1 being the highest (or most import... | <urn:uuid:76e8d5a0-cf12-424a-84a1-d238c1d8e378> | 3.328125 | 1,711 | Documentation | Software Dev. | 53.202715 |
Image of Europa taken by Galileo.
Click on image for full size
Courtesy of NASA
Galileo is Still Going Strong!
News story originally written on January 7, 2000
The spacecraft Galileo is almost done with its mission! Galileo has been flying for ten years. It studied the planet Jupiter and its moons.
Galileo just went to... | <urn:uuid:e0e380f1-edcd-4699-b964-7a391f6ec281> | 3.359375 | 516 | Content Listing | Science & Tech. | 64.201007 |
What Lies Beneath
After a decade of research and exploration, the Census of Marine Life has released incredible new knowledge about life in our Earth's oceans. The study involved 2,700 scientists from 80 countries and more than 9,000 days at sea, ultimately revealing more than 6,000 potentially new species. Among the d... | <urn:uuid:07fcfccb-11a9-45a6-949a-fbf951de0f2a> | 3.46875 | 188 | Content Listing | Science & Tech. | 44.092696 |
Friday, November 03, 2006
Fill the Bill
Third graders from Williams Memorial Elementary School learned about bird bill adaptations through practical experience. They each had a bill type represented by either a stapler remover, an eyedropper, a nail, tongs, tweezers, or a clothespin. There were various food items repre... | <urn:uuid:6f0dd573-6692-4303-ba4d-baa7135141f3> | 3.578125 | 256 | Personal Blog | Science & Tech. | 50.921148 |
I understand that the atmospheric temperature is sensed relative to external body temperature. However, is the sensation of warmth registered linearly, or is it on a logarithmic scale, similar to sound that works on the Decibel scale? Or is it on another scale entirely?
A more general answer/comment is that technically... | <urn:uuid:2362f6dc-a751-43c4-9f27-5d6300dc65cd> | 2.8125 | 441 | Q&A Forum | Science & Tech. | 35.432765 |
I’ve had a few requests to comment on Eli Rabett’s recent post, observing that he was unable to observe a Medieval Warm Period in the bristlecone chronology reported in Salzer and Hughes 2006.
Looking at the tree ring index one can clearly see many large eruptions, the little ice age, but no European Warm Period, often... | <urn:uuid:15643d03-6db8-45ac-9f49-29a664ff1299> | 3 | 1,698 | Personal Blog | Science & Tech. | 47.860265 |
How long does it take the Big Dipper to move in the sky?
What length of time is required for the Dipper to change from one position to the other?
It depends on which is the "one position" and which is the "other position". :)
In the Northern Hemisphere, all of the stars appear to rotate about a point in the sky that is... | <urn:uuid:49d2d028-a8eb-4d53-9985-60882446db78> | 3.546875 | 432 | Q&A Forum | Science & Tech. | 67.775217 |
Climate Change · Part One
Climate Change · Part Two
Introduction to Astronomy
Introduction to Astronomy Syllabus
1.0 - Introduction
2.0 - How Science is Done
3.0 Big Bang, Elements & Radiation
· 3.1 - The Big Bang
· 3.2 - The Formation of Elements
4.0 - Discovery of the Galaxy
5.0 - Age and Origin of the Solar System
6... | <urn:uuid:f041af74-f9a5-4496-a124-6e64dae5209d> | 3.671875 | 879 | Content Listing | Science & Tech. | 55.854213 |
Page:Popular Science Monthly Volume 4.djvu/706
THE POPULAR SCIENCE MONTHLY.
ALTHOUGH not by a balloon, yet the Atlantic has been crossed in the air, and "what has been can be." There are enough well-authenticated cases of the occurrence of American wild birds on the west coast of Europe to prove that the trip can be ma... | <urn:uuid:1f337787-c802-4b76-8faa-0981fdf8bf86> | 2.90625 | 608 | Truncated | Science & Tech. | 42.90724 |
In a data transfer statement, a simple list of items takes the following form:
The variable must not be an assumed-size array, unless one of the following appears in the last dimension: a subscript, a vector subscript, or a section subscript specifying an upper bound.
Any expression must not attempt further I/O operati... | <urn:uuid:7f922293-65df-4ac5-a38e-324f600b6cb0> | 3.078125 | 590 | Documentation | Software Dev. | 58.920481 |
PURPOSE: To aid in illustrating how a siphon works.
DESCRIPTION: A chain passes over a pulley between two beakers. When one of the beakers is raised, the chain flows from the higher into the lower beaker, just as water flows from the higher to the lower container of a siphon. This is due the greater weight of the chain... | <urn:uuid:769be8f0-d3ed-4d10-8508-564559d072d1> | 3.953125 | 190 | Tutorial | Science & Tech. | 61.267081 |
Of course you never want to look at an eclipse directly. Unless you have the correct solar filters, your best bet would be use an indirect means of observing. There are many ways to do this. The simplest way to observe a solar eclipse would be to make a pinhole through some cardboard and allow the sunlight to pass thro... | <urn:uuid:a26e7e42-4921-4363-84fa-fbf818faa969> | 2.953125 | 257 | Personal Blog | Science & Tech. | 54.925794 |
Cosmic Rose Blooms In Star Cluster Photo
The photo depicts the star cluster NGC 371, a stellar nursery in our neighboring galaxy the Small Magellanic Cloud, a dwarf galaxy about 200 000 light-years from Earth. Such regions of ionized hydrogen--known as HII regions--are sites of recent star birth. NGC 371 is an open clu... | <urn:uuid:65a145e1-53c7-45e2-95bb-870d4a7181cd> | 2.96875 | 145 | Truncated | Science & Tech. | 45.812763 |
Is it really greener to go on the bus, or to buy local?
Practice your skills of measurement and estimation using this interactive measurement tool based around fascinating images from biology.
Andy wants to cycle from Land's End to John o'Groats. Will he be able to eat enough to keep him going?
When you change the unit... | <urn:uuid:fd03049f-f42f-4023-8367-e2c91266b205> | 2.96875 | 141 | Content Listing | Science & Tech. | 57.306883 |
General remarks on the temperature of the earth and outer space
General remarks on the temperature of the earth and outer space. American Journal of Science. 32, 1-20 (1837) by Ebeneser Burgess. English translation of "Remarques générales sur les températures du globe terrestre et des espaces planétaires." Annales de C... | <urn:uuid:b8ab6ba0-eba0-4f07-8561-c43fe11ef208> | 3.6875 | 1,103 | Knowledge Article | Science & Tech. | 52.279006 |
Dynamics of Channel Erosion
The physical processes that create eroded channels and drainage networks are recreated to study the physics of channelization. The depth of channels as a function of time is measured using a specialized laser-aided topography technique. Water is fed from a reservoir and the pressure is maint... | <urn:uuid:a80ce144-0976-4257-8aaf-9a075dadc153> | 3.21875 | 202 | Knowledge Article | Science & Tech. | 26.365734 |
You are hereLaunch Vehicles - Aero High
Launch Vehicles - Aero High
Aero High was a sounding rocket used to study the upper atmosphere.
Its main purpose was to investigate chemiluminescent reactions. Twenty One (21)
launches were made from 1964 to 1972. The program was concluded in
1972. The Aero High was superceeded b... | <urn:uuid:ee2d6a4b-8451-482d-ba14-ca494947d2f9> | 2.8125 | 148 | Knowledge Article | Science & Tech. | 86.959367 |
How would you change the course of an
One idea - a massive spacecraft that uses gravity as a towline -
is illustrated in this dramatic artist's view of a gravitational
tractor in action.
In the hypothetical
scenario worked out
in 2005 by Edward Lu and Stanley Love at NASA's
Space Center, a 20 ton
spacecraft tows a 200 ... | <urn:uuid:c6131eca-7c6f-4dcb-87f6-7e964cb10be7> | 3.53125 | 177 | Knowledge Article | Science & Tech. | 35.057302 |
Concerns about rising wildfire fuels may be overblown
Many fear that fire suppression efforts in the U.S. have made forests denser, increasing the risk of catastrophic wildfires. But a study in Forest Ecology and Management suggests that this assumption doesn’t hold true for all forests.
Fuel-reduction schemes, which a... | <urn:uuid:b639d0d3-e3af-4c16-a0c1-b9f7d86ebd75> | 3.484375 | 285 | Truncated | Science & Tech. | 53.498278 |
the process of combining two light nuclei to form a heavy nucleus is known as nuclear fusion
when two light nuclei (having low binding energy the nucleon)are combined to form a heavy nucleus there
occurs a small mass defect which gets converted in to energy
process requires very high temperature for occurnce.
why such ... | <urn:uuid:20cc0774-24a6-4479-808c-1d2f54be561d> | 4.125 | 614 | Q&A Forum | Science & Tech. | 53.466538 |
Maximum Likelihood is a method for the inference of phylogeny. It evaluates a hypothesis about evolutionary history in terms of the probability that the proposed model and the hypothesized history would give rise to the observed data set. The supposition is that a history with a higher probability of reaching the obser... | <urn:uuid:6e523db7-9de9-4c13-ad46-c9525c516ece> | 3.796875 | 1,020 | Knowledge Article | Science & Tech. | 54.128067 |
Arene substitution patterns
are part of organic chemistry IUPAC nomenclature
and pinpoint the position of substituents
other than hydrogen
in relation to each other on an aromatic hydrocarbon
Ortho, meta, and para substitution
- In ortho-substitution, two substituents occupy positions next to each other, which may be n... | <urn:uuid:d1c9ac86-cbd2-4f1f-a5c4-484fd6b809b1> | 3.40625 | 642 | Knowledge Article | Science & Tech. | 21.968448 |
Apr. 12, 2008 As useful as nanotubes may be, the process of making them may have unintentional and potentially harmful impacts on the environment. Carbon nanotubes are 10,000 times thinner than a human hair, yet stronger than steel and more durable than diamonds. They conduct heat and electricity with efficiency that r... | <urn:uuid:fa0931ed-e83e-4dcd-ab43-b82d08677286> | 3.8125 | 538 | Truncated | Science & Tech. | 25.829402 |
Most people connect twisters with Tornadoes, but tropical actually come twisters from the hurricanes. Hurricanes are, which scientists call “strong tropical eddy towers”. They are formed, if large ranges of the ocean are heated, and the air pressure surplus this range drop. This causes Thunderstorms and strong surface ... | <urn:uuid:77d5c3e2-8384-4f7d-9130-eba21fa7b158> | 3.484375 | 144 | Listicle | Science & Tech. | 49.175317 |
In certain calculations in mathematics andrelated sciences, it is necessary to perform operations with numbers unlike any mentioned thus far in this course. These numbers, unfortunately called "imaginary" numbers by early mathematicians, are quite useful and have a very real meaning in the physical sense. The number sy... | <urn:uuid:926848d7-f03f-47dc-ba29-6ddc5c8ceab0> | 4.1875 | 844 | Knowledge Article | Science & Tech. | 43.112368 |
A microscope equivalent to the Hubble telescope has been installed at the Canadian Centre for Electron Microscopy at McMaster. It is said to be the most powerful and advanced electron microscope. It is called the Titan 80-300 and has been put to use already. The university is the first university with a microscope of t... | <urn:uuid:08a4f9a4-e0d3-4a92-8e0f-7675de854fc4> | 2.875 | 185 | Personal Blog | Science & Tech. | 50.257948 |
Gyre, without getting into a big long explanation, the source of the energy is generally referred to as "zero point energy". There are various claims for it's density. One claim is that "if all the energy contained in 1 cubic centimeter was changed into matter, it would produce more matter than exists in the observable... | <urn:uuid:ed7017d9-f8e2-4315-8984-cce6e6e15a87> | 2.703125 | 434 | Comment Section | Science & Tech. | 47.873753 |
Choose any three by three square of dates on a calendar page.
Circle any number on the top row, put a line through the other
numbers that are in the same row and column as your circled number.
Repeat this for a number of your choice from the second row. You
should now have just one number left on the bottom row, circle... | <urn:uuid:47fb2bc3-92a1-4591-aee5-baaa20f7ba36> | 3.890625 | 254 | Tutorial | Science & Tech. | 71.394341 |
A simple accelerometer
You tape one end of a piece of string to the ceiling light of your car and hang a key with mass m to the other end (Figure 5.7). A protractor taped to the light allows you to measure the angle the string makes with the vertical. Your friend drives the car while you make measurements. When the car... | <urn:uuid:3474766e-7995-4e03-9e99-8bb3285fa050> | 3.859375 | 337 | Q&A Forum | Science & Tech. | 67.761758 |
Nobel Scientists | Interviews with Nobel Prize winning scientists
The 20th Century was a time that saw significant advances in all branches of science. In the 1980s, the BBC decided to preserve a record of some of the great minds behind these remarkable developments and recorded a series of in-depth interviews with Nob... | <urn:uuid:4ff1e2a6-f620-427c-ba02-030e2f3e89f3> | 3.1875 | 272 | Content Listing | Science & Tech. | 48.215676 |
Creating a dynamically named verb is rather simple, simply add the verb like you would a new object, supplying the name as an argument of new().
Now instead of the verb being named 'Activate' it will be called 'One' but it'll still execute Activate() when used. Pretty handy, huh?
The new() proc for verbs can take three... | <urn:uuid:fd66cae2-e8b4-480e-b140-1b07efe5b99a> | 2.765625 | 387 | Comment Section | Software Dev. | 62.729068 |
|Example of JL Component Composition|
illustrate an example of JL component composition using the TransportIfc
We now define three layers that use this interface. The TCP layer exports TransportIfc and provides data transport using TCP. The Secure layer provides data encryption/decryption and the KeepAlive layer automa... | <urn:uuid:927e45cb-de33-4c84-8b61-25c1890997da> | 2.859375 | 466 | Documentation | Software Dev. | 31.991081 |
From our childhood days in elementary school science class we have been taught that matter exists in three states: namely solids, liquids and gases. Recently an additional state known as plasma has been recognized but it is more theoretical than practical importance at present.
H2O can exist in any of the three common ... | <urn:uuid:557086e3-a398-454b-a94d-11654d2640ee> | 3.953125 | 3,219 | Knowledge Article | Science & Tech. | 41.721342 |
Probability (part 1) What probability is.
Probability (part 1)
⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles.
- Good morning or evening or whatever it is where you are,
- wherever you're happening to... | <urn:uuid:87570c61-39a2-41d6-9090-3a869fbc640c> | 3.21875 | 2,882 | Truncated | Science & Tech. | 72.646747 |
A team of ceramists pinpoints a hitherto unknown internal phase transition.
Why does a solid metal that is engineered for ductility become brittle in the presence of certain liquid metal impurities?
The phenomenon, known as liquid metal embrittlement, or LME, has baffled metallurgists for a century.
Now, ceramics resea... | <urn:uuid:3aa291fd-4719-4ef3-914f-9e6c94cb558a> | 3.375 | 873 | Knowledge Article | Science & Tech. | 38.512764 |
GREENLAND lost 1500 cubic kilometres of ice between 2000 and 2008, making it responsible for one-sixth of global sea-level rise. Even worse, there are signs that the rate of ice loss is increasing.
Michiel van den Broeke of Utrecht University in the Netherlands and colleagues began by modelling the difference in annual... | <urn:uuid:6180b7eb-f411-4f9e-b935-57b0620072e2> | 4.0625 | 223 | Truncated | Science & Tech. | 58.318788 |
Date: Saturday, April 20, 2002
How do I tell the sex of my frog or toad?
It depends on the species. Males of many species have enlarged thumb or
forefinger, some have enlarged pads on those limbs, or harder spots, used
for grasping the female during mating. Other species have differences in the
throat sac. There is a s... | <urn:uuid:8505d4bb-e16e-4ab7-869a-17e91de2568e> | 3.234375 | 135 | Knowledge Article | Science & Tech. | 63.509412 |
Physical chemist whose investigations of dipole moments, X rays, and
light scattering in gases brought him the 1936 Nobel Prize for Chemistry.
Debye was a dominant figure in physical chemistry and chemical physics during the first half of the 20th century. Debye's first important research, his dipole moment studies, ad... | <urn:uuid:18d4305b-d34c-4732-bfdc-6273f4c104a2> | 3.5625 | 262 | Knowledge Article | Science & Tech. | 37.058422 |
|Sep20-12, 06:59 PM||#1|
Control of RH and Temp of Air
I am trying to provide a humid air stream along some ¼” tubing, where I can roughly control the relative humidity and temperature, this doesn't need to be exact.
I already have a compressed air tank, regulator and flow meter to provide the correct flow rate.
I need... | <urn:uuid:af5ec1f8-8b19-4006-ad26-b333ddccbda2> | 2.71875 | 311 | Comment Section | Science & Tech. | 33.622471 |
To be sure the science is extremely exciting. The Higgs was first proposed in the 1960s and is thought to be the remnant of a ubiquitous interaction common to all objects with mass. The Higgs discovery is solidly grounded in concrete, observable phenomena.
It took a colossal new scientific instrument, the Large Hadron ... | <urn:uuid:b1e29008-0b62-4e82-b3ca-d6baf33864ef> | 3.171875 | 554 | Nonfiction Writing | Science & Tech. | 49.886481 |
Solar Storm Dumps Gigawatts into Earth's Upper Atmosphere
March 22, 2012
A recent flurry of eruptions on the sun did more than spark pretty auroras around the poles. NASA-funded researchers say the solar storms of March 8th through 10th dumped enough energy in Earth’s upper atmosphere to power every residence in New Yo... | <urn:uuid:960b8e31-64d2-4f57-80a8-ab39506aa1f0> | 3.078125 | 1,076 | Comment Section | Science & Tech. | 48.783193 |
Carolyn Porco Carolyn, leader of the imaging science team on the Cassini mission at the Google Tech Talks in May 23, 2007
A glistening spaceship, with seven lonely years and billions of miles behind it, glides into orbit around a ringed, softly-hued planet. A flying-saucer shaped machine descends through a hazy atmosph... | <urn:uuid:ba8ed166-6227-493a-8182-d60d838497c1> | 3.390625 | 247 | Truncated | Science & Tech. | 33.683947 |
Last year, astronomers saw the violent death throes of a star as it was literally torn apart by a black hole (see here, and links within). And now, they’ve seen it again: observations across the electromagnetic spectrum caught another star that wandered too close to a supermassive black hole, and suffered the ultimate ... | <urn:uuid:05d5ff17-6a6f-4a11-aa51-fa08f65e436f> | 3.3125 | 367 | Personal Blog | Science & Tech. | 51.613819 |
If you're a long-time reader of this site, you're probably already aware of the existence of tardigrades or water bears, microscopic stumpy-legged invertebrates. Previous posts on Tardigrada have given an overview of the main subgroups of tardigrades, and suggested how you might find your own specimens. The next logica... | <urn:uuid:f20122e3-ded0-4523-8c26-cbf69193cd4d> | 3.03125 | 1,033 | Knowledge Article | Science & Tech. | 49.120513 |
Sieve of Eratosthenes
In mathematics, the sieve of Eratosthenes (Greek: κόσκινον Ἐρατοσθένους), one of a number of prime number sieves, is a simple, ancient algorithm for finding all prime numbers up to any given limit. It does so by iteratively marking as composite (i.e. not prime) the multiples of each prime, startin... | <urn:uuid:d9989885-7994-444e-8b35-61a34943bbaa> | 4.34375 | 2,809 | Knowledge Article | Science & Tech. | 77.734465 |
Climate change threatens endangered freshwater turtle
The Mary river turtle (Elusor macrurus), which is restricted to only one river system in Australia, will suffer from multiple problems if temperatures predicted under climate change are reached, researchers from the University of Queensland have shown. The scientist... | <urn:uuid:5492f0cb-d8f2-491b-b9cd-7e2ac1ca74a7> | 3.546875 | 807 | Truncated | Science & Tech. | 23.503846 |
Need HELP on THIS PLEASE!!!!!!
I'm stuck and I hate this. Someone help me out please.
Write a graphics program that asks the user to specify the radii of two circles. The first circle has center (100,200), and the second circle has center(200,100). Draw the circles. If they intersect, then display a message "Circles in... | <urn:uuid:42ee6b20-6551-4b1c-90b7-8586f739fa8d> | 3.359375 | 723 | Comment Section | Software Dev. | 67.872592 |
Measuring Edge Effects on Nest Predation in Forest Fragments: Do Finch and Quail Eggs Tell Different Stories?
American Midland Naturalist
Experiments assessing rates of avian nest predation often find that nests near forest edges are at high risk of predation, suggesting the importance of forest fragmentation in recent... | <urn:uuid:05870779-bcdd-41ba-b5a6-ba9c2bd285e7> | 3.5 | 405 | Academic Writing | Science & Tech. | 30.285923 |
Search Loci: Convergence:
There is more in Mersenne than in all the universities together.
In G. Simmons Calculus Gems, New York: McGraw Hill Inc., 1992.
A Euclidean Approach to the FTC
This article is dedicated to all those students for whom the limit is their most bitter memory of calculus. I grant that the limit rea... | <urn:uuid:0fa25e73-ebdf-4830-a0d3-b93dc1439aeb> | 2.828125 | 365 | Academic Writing | Science & Tech. | 35.902092 |