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Waves, Sound and Light: Light Waves
Light Waves: Problem Set
Unless told otherwise, use 2.998x108 m/s as the value of the speed of light.
In 1957, the U.S. Naval Research Laboratory conducted the first ever radar measurements of the distance from the Earth to the moon. By reflecting light from an Earth-based source off... | <urn:uuid:02a3b886-6ab8-45ca-a6a5-7e6d15b0e8f3> | 3.734375 | 2,665 | Tutorial | Science & Tech. | 68.012279 |
Plasmonics: When silver is better than gold
Published online 20 June 2012
Silver nanostructures exhibit a resonance feature that is useful for a multitude of sensing applications
Scheme (top) of the dual-disk ring structure and scanning electron micrscosopy images of fabricated devices (bottom)
Reproduced with permissi... | <urn:uuid:dabca1aa-8095-4d2e-8704-5b165a62f9ac> | 3.234375 | 702 | Academic Writing | Science & Tech. | 25.213405 |
The universe doesn't do medium. In terms of what turns heads, you're either very, very big (think galactic clusters) or very, very small (think neutrinos and bosons). That's long been assumed to be the rule for black holes too. For 30 years, astronomers have been looking for evidence of a theorized class of black hole ... | <urn:uuid:5188f336-6a34-4adf-9b41-d9523b48f59d> | 3.75 | 1,162 | Truncated | Science & Tech. | 44.994919 |
Scandium, Sc, is a hard silvery transition metallic
element, found in
Group IIIa of the
- Atomic Number : 21
- Relative Atomic Mass : 44.9559
- Melting Point : 1540 degC
- Boiling Point : 2850 degC
- Relative Density : 3.0
Scandium was first discovered by Nilson in 1879AD.
Scandium is a more abundant element in the sun... | <urn:uuid:40a30021-bca2-4668-9f33-387f632d7ecb> | 3.375 | 175 | Knowledge Article | Science & Tech. | 64.941748 |
In 1971, Stephen Cook and Leonid Levin -- a pair of pioneering computer scientists on opposite sides of the Iron Curtain -- independently posed a question that has flummoxed generations of researchers since. It's called P vs NP, and essentially asks whether any problem whose answer can be quickly verified by a computer... | <urn:uuid:413a22ce-edab-41d1-8b13-69780e8605b0> | 3.25 | 1,073 | Knowledge Article | Science & Tech. | 41.074486 |
With Comet 168P/ Hergenrother still bright and perfectly placed high in the southeast at nightfall, I wanted to share an updated map for amateur astronomers with 6-inch and larger telescopes who’d like to track the comet. At around magnitude 9.5, it’s still the brightest fuzzball in the fall sky. For the next couple we... | <urn:uuid:9b78e413-c7a5-4ab5-97e0-49382f40e019> | 3.046875 | 1,009 | Personal Blog | Science & Tech. | 60.194691 |
It is happening frequently lately. A major weather event occurs---perhaps a hurricane, heat wave, tornado outbreak, drought or snowstorm-- and a chorus of activist groups or media folks either imply or explicitly suggest that the event is the result of human-caused (anthropogenic) global warming. Perhaps the worst offe... | <urn:uuid:2fc30220-379d-439a-be1f-049c9d8c4eed> | 3 | 1,449 | Personal Blog | Science & Tech. | 51.461918 |
What Might Have Been
In the new analysis, Newman and colleagues set out to predict ozone losses as if nothing had been done to stop them. The team started with the Goddard Earth Observing System Chemistry-Climate Model, an earth system model of atmospheric circulation that accounts for variations in solar energy, atmos... | <urn:uuid:1ca185ce-a761-4413-a41a-debfbc4ba062> | 3.90625 | 1,110 | Knowledge Article | Science & Tech. | 56.290256 |
Like the much-maligned and infamous black flies, mayflies require cold, clean oxygen-rich water, like that in Dublin Lake shown here. Photo by Jerry and Marcy Monkman, EcoPhotography
By Dave Anderson
By May, twilight arrives late. From the high and lonesome expanse of Interstate-89, evening alpenglow illuminates a flan... | <urn:uuid:b107180c-261c-4b34-b789-e4c8a9db83eb> | 2.84375 | 1,412 | Nonfiction Writing | Science & Tech. | 52.881339 |
It's been some time since we've heard cries for help regarding the degradation of the Earth's ozone layer and subsequent doom of life as we know it. But apparently, the keening has begun again.
In the HVACR industry, there probably isn't a single engineer, manufacturer, distributor, or contractor who doesn't know somet... | <urn:uuid:7760a45d-4978-4279-a403-8392ccb644c4> | 3.28125 | 704 | Personal Blog | Science & Tech. | 41.590724 |
Review for 2nd Lecture Test
Optical Mineralogy (Chapter 7)
1) What is an optic axis?† Compare and contrast uniaxial and biaxial minerals by describing differences in crystal structure and symmetry.† List the systems that belong in each group.†
2) Define and describe birefringence and the resulting interference colors.†... | <urn:uuid:7c50ef3d-6157-44ad-b2ca-0ba48f49b338> | 3.71875 | 1,230 | Tutorial | Science & Tech. | 31.417354 |
For number 2, I've successfully graphed it but how do I go about finding its area of the shaded region?
That looks to me like a trapezoid. Do you know the formula for area of a trapezoid?
If not, notice that if you draw a line at y= 3, you divide this figure into a rectangle, with length 6 and height 3 and a right tria... | <urn:uuid:e0d5b421-2b89-4df8-9296-958acfdb7ec3> | 2.703125 | 104 | Q&A Forum | Science & Tech. | 77.232814 |
how do you graph xy<12?
i can't find any examples in my book .
I suppose you could do this:
Transform xy<12 to y<12/x.
Sketch the graph y = 12/x, a hyperbola if I am correct.
Change your curves to dotted boundaries.
Select some test points to find regions where xy<12.
Shade the areas for which xy<12.
I think you will h... | <urn:uuid:ba4c9ab4-91ce-4485-ba65-e1a1d442e739> | 3.40625 | 111 | Q&A Forum | Science & Tech. | 94.671375 |
The Higgs Boson, Part III: How to Discover a Particle
About this video
600 million collisions, every second, for two years.
Guest featuring John Green of Crash Course this Minute Physics episode looks at exactly how one goes about 'discovering' a particle such as the Higgs Boson – or should we really say scientific 'fa... | <urn:uuid:b4afff75-2c87-4412-86d5-6384e05c51a8> | 2.734375 | 171 | Truncated | Science & Tech. | 36.766625 |
Reports and Articles on Climate Change (6-18-02)
This page contains summaries of or links to a variety of reports and articles relevant to climate change and its relationship to policy:
National Research Council (NRC): Abrupt Climate Change: Inevitable Surprises, December 2001
Recognizing that there has been no plan fo... | <urn:uuid:805d027c-ee42-46fb-83f5-f5939e14717c> | 2.953125 | 2,284 | Content Listing | Science & Tech. | 22.824235 |
BEE DIVERSITY AND THE DEVELOPMENT OF HEALTHY, SUSTAINABLE BEE POLLINATION SYSTEMS
Location: Pollinating Insects-- Biology, Management and Systematics Research
Title: The montane bee fauna of north central Washington, USA, with floral associations
Submitted to: Western North American Naturalist
Publication Type: Peer Re... | <urn:uuid:41104655-7824-4b09-bea5-c65279a08fff> | 3.109375 | 480 | Academic Writing | Science & Tech. | 32.123245 |
wonders Where’s the warming?:
Global greenhouse gas emissions have risen even faster during the past decade than predicted by the United Nations Intergovernmental Panel on Climate Change (IPCC) and other international agencies. According to alarmist groups, this proves global warming is much worse than previously feare... | <urn:uuid:5f3cefc2-5af5-45d6-aef5-809a51f9044e> | 3 | 799 | Comment Section | Science & Tech. | 45.706218 |
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.
...in the control of insect pests. Apanteles glomeratus, for example, parasitizes the larvae of the cabbage butterfly (Pieris rapae) and the cabba... | <urn:uuid:9507f2ab-1bdd-462e-b2d7-00c5f604c5b5> | 3.171875 | 235 | Knowledge Article | Science & Tech. | 40.2804 |
An overview of the Chandra mission and goals, Chandra's namesake, top 10 facts.
Classroom activities, printable materials, interactive games & more.
Overview of X-ray Astronomy and X-ray sources: black holes to galaxy clusters.
All Chandra images released to the public listed by date & by category
Current Chandra press... | <urn:uuid:16ba9467-6cb6-4e69-bdfd-1a3d7fa6c069> | 3.015625 | 865 | Content Listing | Science & Tech. | 44.552821 |
Fewer Cold Nights and Cold Days
More Warm Nights and Hot Days
Global warming is increasing the frequency and intensity of some types of extreme weather. For example, warming is causing more rain to fall in heavy downpours. There are also longer dry periods between rainfalls. This, coupled with more evaporation due to h... | <urn:uuid:9ab8e0d2-ccf5-446c-b3b9-c95f6ce83533> | 3.703125 | 123 | Knowledge Article | Science & Tech. | 39.02 |
Date: 10/24/00 2:39:27 PM Pacific Daylight Time
Just looked at the "tubes" you have on your site. Of course it is
impossible to say exactly what they are unless someone can remote view
them, but I would like to offer a few observations.
Looking at http://ida.wr.usgs.gov/fullres/divided/m04002/m0400291a.jpg
we see what ... | <urn:uuid:a817adca-6e0e-4904-8986-130ffb2069bd> | 2.765625 | 587 | Comment Section | Science & Tech. | 59.989209 |
Gravity is an invisible force that pulls
everything towards the earth. No matter how hard an object is thrown
it starts to come back down to earth. This is an example of gravity
at work. Gravity pulls everything down with the same force. It
doesn't matter how heavy or how light the object is. It is the same
for all obj... | <urn:uuid:99b8cfaa-9093-4c73-a971-d77d1ed3a2d5> | 3.75 | 197 | Knowledge Article | Science & Tech. | 72.03625 |
December 21, 2009 (New 2011 reference added.)
Celebrated Moon Rocks--- Overview and status of the Apollo lunar collection: A unique, but limited, resource of extraterrestrial material.
Written by Linda M. V. Martel
Hawaii Institute of Geophysics and Planetology
The Need for Lunar Samples and Simulants: Where Engineerin... | <urn:uuid:2b020090-4695-4e40-ad26-4708047cf3e5> | 3.40625 | 2,210 | Knowledge Article | Science & Tech. | 32.589078 |
The solid state of water is known as ice; the gaseous state is known as water vapor (or steam). The units of temperature (formerly the degree Celsius and now the Kelvin) are defined in terms of the triple point of water, 273.16 K (0.01 °C) and 611.2 Pa, the temperature and pressure at which solid, liquid, and gaseous w... | <urn:uuid:312c735c-3573-47f1-82b5-a5a9dbaa7a96> | 4.125 | 1,914 | Knowledge Article | Science & Tech. | 32.833679 |
The study of processes that make life possible is hardly a leisurely pursuit, but that doesn't preclude researchers from taking advantage of the most advanced video gaming technology available to aid in their work. A team of University of Illinois at Urbana–Champaign (U.I.U.C.) physicists has assembled a supercomputer ... | <urn:uuid:769238e1-d96e-48b6-a43f-acb5111218a1> | 3.53125 | 337 | Content Listing | Science & Tech. | 39.173269 |
Wild Thing is an occasional series where JHU Press authors write about the flora and fauna of the natural world—from the rarest flower to the most magnificent beast.
Guest post by Uldis Roze
Having grown up in large cities where porcupines are absent, I was in my 30s before I saw my first porcupine in the wild. We met ... | <urn:uuid:fe8cb036-7141-4523-893c-7fd1093292a7> | 3.40625 | 1,254 | Personal Blog | Science & Tech. | 51.272735 |
There are many examples from computing but I guess you're after areas that have mathematical interest in their own right.
I think I good one is the Monte Carlo method. The idea has been around since Buffon's idea of estimating $\pi$. But it became important leading up to, and during the Manhattan Project, when Fermi an... | <urn:uuid:463a875b-754b-4085-8171-2b35f7c4436a> | 2.875 | 272 | Comment Section | Science & Tech. | 38.306017 |
Genetic Studies of Bats Impacted by Wind Farms
There is increasing evidence that turbines used for power generation at wind farms can cause significant mortality of bats. Several migratory species, including Red Bats (Lasiurus borealis and Lasiurus blossevillii), Hoary Bats (Lasiurus cinereus) and Silver-haired Bats (L... | <urn:uuid:3c314fa2-0392-455f-af88-c886d5dc9279> | 3.453125 | 451 | Academic Writing | Science & Tech. | 21.084963 |
Science Fair Project Encyclopedia
Asian Tiger Mosquito
|- valign=top |Suborder:||Culicomorpha
Aedes albopictus (Family Culicidae), the Asian Tiger Mosquito or Forest Day Mosquito, is characterized by its black and white striped legs and small, black and white body. Other North American mosquitoes such as Ochlerotatus c... | <urn:uuid:c1eb2f67-fa9b-464c-a993-cebf1cf18023> | 3.546875 | 794 | Knowledge Article | Science & Tech. | 48.648848 |
Promise meeting potential
In their model, the team identified three crucial variables to controlling an MFC: the amount of waste material (fuel), the accumulation of biomass on the anode, and the electrical potential in the biofilm anode. The third factor is a totally novel concept in MFC research.
"Modeling the potent... | <urn:uuid:1452cacb-6472-43b7-bb4a-49b044e0fd51> | 3.03125 | 276 | Knowledge Article | Science & Tech. | 43.545415 |
The semaphore class works similar to the
Monitor and Mutex class but lets you set a limit on how many threads have access
to a critical section. It's often described as a nightclub (the semaphore) where
the visitors (threads) stands in a queue outside the nightclub waiting for
someone to leave in order to gain entrance... | <urn:uuid:ec519b6c-3250-4e20-afea-c9a9d9b758ac> | 3.046875 | 1,108 | Documentation | Software Dev. | 31.613025 |
The United States is pushing for an Arctic agenda that promotes resource cooperation among Arctic and non-Arctic countries as part of a broader effort to foster diplomatic engagement in the High North. During a recent visit to Tromso, Norway in the Arctic Circle, Secretary of State Hillary Rodham Clinton emphasized tha... | <urn:uuid:869cf791-df12-43f1-9b2e-3f7ba1d08bca> | 2.71875 | 2,179 | Personal Blog | Science & Tech. | 27.946717 |
This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
Thread safety means that the object that is accessed by multiple threads is always in the valid and the consist... | <urn:uuid:94230cdd-6f5e-4e2c-87c4-e056a79b34e2> | 3.125 | 579 | Comment Section | Software Dev. | 61.425268 |
Extraction of Metals
Extraction of Copper - Purification by Electrolysis.
The anode is a block of impure copper.
The cathode is a thin piece of pure copper.
When electricity is passed through the cell
copper is dissolved at the anode by oxidation
and Cu2+ ions go into solution.
Cu(s) - 2e- Cu2+(aq)
At the cathode, copp... | <urn:uuid:08554384-f423-4049-a9b3-c42bcb21acb6> | 3.5625 | 183 | Knowledge Article | Science & Tech. | 55.133333 |
Internally and externally induced climate variability
Climate variations, both in the mean state and in other statistics such as, for example, the occurrence of extreme events, may result from radiative forcing, but also from internal interactions between components of the climate system. A distinction can therefore be... | <urn:uuid:1156523f-6279-497e-bc4f-833cca1361e8> | 3.421875 | 1,608 | Knowledge Article | Science & Tech. | 20.228532 |
Quantum Physics & Consciousness
In the most simple terms consciousness refers to the unified sense of awareness that we all have of who we are and what we are. It is the unique subjective inner world that we all experience during our daily lives. Understanding the nature of consciousness and the self, has become one of... | <urn:uuid:c2e4b3b1-a8de-4f7f-92d5-f896f7658e97> | 2.859375 | 492 | Knowledge Article | Science & Tech. | 31.111673 |
Mars Hoax Day is once again here, so if you get an email telling you to look for a giant red planet in the night sky, just ignore it.
For nearly a decade, Mars Hoax Day has turned up each August 27, spreading by email and claiming that Mars will appear in the sky just as large as the full moon.
Wikipedia breaks it down... | <urn:uuid:e7a395fb-2efa-47a2-ba43-166dd1b64cc5> | 3.234375 | 604 | Nonfiction Writing | Science & Tech. | 74.230303 |
Optimize with a SATA RAID Storage Solution
Range of capacities as low as $1250 per TB. Ideal if you currently rely on servers/disks/JBODs
All integer types supported by the JVM -- bytes, shorts, ints, and longs -- are signed two's-complement numbers. The two's-complement scheme allows both positive and negative integer... | <urn:uuid:04d2e2fe-f800-4af7-9318-01eb1daaa60a> | 3.296875 | 564 | Documentation | Software Dev. | 63.01434 |
|An Alabama Copperhead|
2. Those Who Do Not Learn From the Past... Biologists, and even conservation biologists, historically had some curious views regarding their study organisms, views that seem very odd today. The classic example, to me at least, is that of Sir Alfred Russell Wallace (1823-1913), a pioneering biolo... | <urn:uuid:f5aee1c3-b44a-4b6f-8bcb-fb9f0f661917> | 2.828125 | 1,199 | Personal Blog | Science & Tech. | 52.149143 |
Greater Bamboo Lemur, Prolemur simus
The greater bamboo lemur (Prolemur simus) is native only to the island of Madagascar. Its other common names include the broad-nosed gentle lemur and the broad-nosed bamboo lemur. It has a small range in southwestern Madagascar, although it is thought that its range was much larger ... | <urn:uuid:86d3c655-a467-4849-b3a2-9d33710ed39e> | 3.625 | 525 | Knowledge Article | Science & Tech. | 50.41531 |
In about five billion years, Earth is going into the broiler. The sun will swell up into a red giant, engulfing us and the other inner planets. And that'll be that.
Or will it? Astronomers recently found two small planets orbiting very close to a star about 4,000 light-years away. The star has already passed through it... | <urn:uuid:cdd72f82-29e8-402e-ab5e-df2ddd08a2c0> | 3.453125 | 290 | Truncated | Science & Tech. | 63.029954 |
Chemical study resolves art controversy: Scientists
(NEWSER) – Picasso's great works had humble origins: They were painted using house paint, scientists say. Art historians have long debated whether Picasso was one of the first painters to use the standard enamel-based stuff rather than oil paints, but past paint-chip ... | <urn:uuid:cccf3753-f435-42e7-8b57-a0e65b87fbe9> | 2.984375 | 126 | Truncated | Science & Tech. | 23.30386 |
Light Clock Relations
Physics Front Related Resources
A link to the full collection of Galileo and Einstein Physics Flashlets, by the same authors.
A set of multimedia resources targeting high school and lower-level undergraduate students. It presents the physics of special relativity plus simulations to visualize how ... | <urn:uuid:cc3ca6a9-88f5-4247-b082-eaf2c3690862> | 2.921875 | 91 | Content Listing | Science & Tech. | 28.368421 |
Thu Feb 5 17:29:21 CET 2009
For a simple static C program with a bit of dynamic data, this is a
simple list structure based only on concatenation, with "next"
pointers embedded in the objects.
This works for pure trees (flat trees).
Conceptually, only these operations are necessary:
* a PUSH operation of a singleton to... | <urn:uuid:73024876-2f2c-48fa-8842-983ba54e3972> | 2.6875 | 343 | Comment Section | Software Dev. | 57.517721 |
Kepler finds red giants with rapidly spinning cores.
"An international team of astronomers led by PhD student Paul Beck from Leuven University in Belgium have managed to look deep inside some old stars and discovered that their cores spin at least ten times as fast as their surfaces. The result appeared today in the jo... | <urn:uuid:ec2197d6-6080-4464-b715-3fdb10f54eb4> | 3.046875 | 1,379 | Comment Section | Science & Tech. | 53.976668 |
I = ∫∫R (x + y)dA where R is the region bounded by the curve y = x² and the line y = 1.
(a) Calculate I by integrating first in y and then in x.
(b) Calculate I by integrating first in x and then in y.
This is what I got for (a): Limits for y are x² =< y =< 1, making this a parabola from origin to y=1. solving x²=1 (up... | <urn:uuid:949719e6-13d9-461f-8153-27bef5b8514f> | 2.75 | 211 | Q&A Forum | Science & Tech. | 97.715807 |
Dec. 31, 2009
NASA's Mars rover Spirit is about to mark six years of Red Planet exploration. However, the upcoming Martian winter could end the roving career of the beloved, scrappy robot.
Dec. 29, 2009
Party planners take note. For the first time in almost twenty years, there's going to be a Blue Moon on New Year's Ev... | <urn:uuid:b266aab9-4efd-4c85-8aba-1fae4bcafee8> | 2.859375 | 453 | Content Listing | Science & Tech. | 62.135882 |
Glen Whitney wants to change that. Whitney is the founder and executive director of New York City’s Museum of Mathematics, or MoMath. His goal? Create a museum that presents math as more than just numbers and arithmetic.
“The way math is taught today is like teaching music education by forcing students to learn musical... | <urn:uuid:13e58da0-2cc6-442d-b9b5-f4dde6108888> | 3.421875 | 362 | Personal Blog | Science & Tech. | 53.14206 |
A new paper in Geophysical Research Letters presents “a 6800–year, decadally-resolved biomarker and multidecadally-resolved hydrogen isotope record of hydroclimate from a coastal Maine peatland.”
The researchers say that “Regional moisture balance responds strongly and consistently to solar forcing at centennial to mil... | <urn:uuid:d04ec01e-c978-4b77-966d-f843940e8d07> | 2.796875 | 268 | Truncated | Science & Tech. | 33.272353 |
Science Fair Project Encyclopedia
This subfamily is widely distributed and members are adapted to a wide varitely of environments. Faboideae may be trees, shrubs or herbs. Flowers are classically pea shaped and root nodulation is very common.
Note: The type genus, Faba, is a synonym for Vicia and is listed here as Vici... | <urn:uuid:81dc8e81-4882-4dcf-9dac-6f3239a7c7a1> | 3.015625 | 107 | Knowledge Article | Science & Tech. | 37.6675 |
Earth Flips Magnetic Poles All the Time
Reversals are the rule, not the exception. Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that long since the last reversal. A reversal happens over hundreds or thousands ... | <urn:uuid:48473196-dd1a-4894-ab9c-36d5498fd57d> | 4.15625 | 608 | Knowledge Article | Science & Tech. | 34.302436 |
Lurking behind dust and stars near the plane of our
Milky Way Galaxy,
IC 10 is
a mere 2.3 million light-years distant.
Even though its light is dimmed by intervening dust,
the irregular dwarf galaxy still shows off vigorous star-forming regions
that shine with a telltale reddish glow in
In fact, also a member of the Lo... | <urn:uuid:1a5ac452-d6c6-4444-a81f-6834a7288055> | 2.765625 | 155 | Knowledge Article | Science & Tech. | 38.500402 |
We have seen how Riemann sums can be used to approximate areas and volumes. The definite integral, as the limit of a Riemann sum as the slice width goes to zero and the number of slices goes to infinity, provides a way to find the actual area or volume. We can use the same technique to find the length of the graph of a... | <urn:uuid:0354d4ee-586c-4b3a-818e-bf03baf6d81d> | 3.6875 | 982 | Tutorial | Science & Tech. | 54.256667 |
Elon Musk, the founder of PayPal and chairman of electric car company Tesla, recently said that he believed most of the world's power would come from solar by 2040. That seems remarkably optimistic to me.
At the Future in Review Conference, Musk said that in 30 years, solar thermal and solar photovoltaic power will, co... | <urn:uuid:c5314f67-47c2-4a5b-82aa-fbc0f78b7576> | 2.828125 | 424 | Personal Blog | Science & Tech. | 56.035539 |
Weather prediction improvements come from a balanced program of improved observations, improved understanding of phenomena, and improved numerical modeling. In addition to NOAA’s primary efforts in tropical storm prediction, there are efforts at Earth System Research Laboratory to make improvements in all three areas. ... | <urn:uuid:7f2df0c1-8b1f-4f34-a17a-fd630f9f8a5e> | 2.921875 | 203 | Academic Writing | Science & Tech. | 21.998257 |
The Blue Brain Project (BBP)
According to the EPFL website:
"The first phase of BBP will be to replicate in software, a column of the Neocortex (NCC) with 10,000 morphologically complex neurons with unprecedented detail for high-speed simulations.Today's IBM press release reads in part:
The second and subsequent phases... | <urn:uuid:1026af49-ddfd-4e4a-b726-8bddeee50652> | 2.75 | 526 | Personal Blog | Science & Tech. | 36.369412 |
Named Vector Members
We can assign names to vector members.
For example, the following variable v is a character string vector with two members.
We now name the first member as First, and the second as Last.
Then we can retrieve the first member by its name.
Furthermore, we can reverse the order with a character string... | <urn:uuid:a2e6a1fb-18d6-46cc-8ea9-efe074bd7a58> | 3.21875 | 73 | Tutorial | Software Dev. | 62.939356 |
I am guessing you are referring to the experiment on this page: http://www.sciencebuddies.org/science-f ... p011.shtml
I will try to answer as many of these as I can. I believe most of these are answered in the webpage already though though.
2. What if the reflected ray isn't equal to θi ? Shall the reflected ray be or... | <urn:uuid:caf2c9de-0186-4872-a789-8b58b630f4d5> | 3.0625 | 766 | Q&A Forum | Science & Tech. | 79.595132 |
Lots of Water, but Not Always Where It Is Needed
One hundred and ten thousand cubic kilometers of precipitation, nearly 10 times the volume of Lake Superior, falls from the sky onto the earth’s land surface every year. This huge quantity would be enough to easily fulfill the requirements of everyone on the planet if th... | <urn:uuid:a5e51d45-66e0-4475-868d-8aa67f8a56ac> | 3.921875 | 306 | Knowledge Article | Science & Tech. | 29.723714 |
King crabs migrate to the Antarctic due to climate change.
A new study published in the Proceedings of the Royal Society B by researchers at the University of Hawaii at Manoa in the USA has found that King crabs have been moving constantly in response to underwater temperature increases, driving them toward the previou... | <urn:uuid:86576b11-9926-4db3-a908-f7f2e2f9bbd4> | 3.359375 | 694 | Content Listing | Science & Tech. | 53.127251 |
Living Planet Index
The Living Planet Index and the Living Planet Report are produced by the Worldwide Wildlife Foundation, whose mission is "to stop the degradation of our planet's natural environment, and build a future in which humans live in harmony with nature."
The Living Planet Index is one of the longest-runnin... | <urn:uuid:40d5bf34-6287-4015-808d-a3bde307c835> | 3.4375 | 668 | Knowledge Article | Science & Tech. | 41.225386 |
Water and pH
The Water Molecule. All substances are made up of millions of tiny atoms.
These atoms form small groups called molecules. In water,
for example, each molecule is made up of two hydrogen atoms and
one oxygen atom. The formula for a molecule of water is H2O.
"H" means hydrogen, "2" means 2 hydrogen
atoms, an... | <urn:uuid:21e8b524-a4a8-4bb5-b000-1b2c8e31eacc> | 3.859375 | 172 | Knowledge Article | Science & Tech. | 63.927273 |
Operators manipulate individual data items (operands) and return a result. Mimer SQL uses the following operators:
UNION or UNION ALL
Derives a final result set by combining two other result sets.
If you specify UNION ALL, the result consists of all rows in both results sets.
If you only specify UNION, the final result... | <urn:uuid:73187822-a304-4877-b2dd-50d178c2c01a> | 3.578125 | 330 | Documentation | Software Dev. | 26.058985 |
Scope and Qualifiers
Go Up to Using the object model Index
Scope determines the accessibility of an object's fields, properties, and methods. All members declared in a class are available to that class and, as is discussed later, often to its descendants. Although a method's implementation code appears outside of the c... | <urn:uuid:9c4fc27a-9715-495c-9a10-d191e40e5ff1> | 3.296875 | 439 | Documentation | Software Dev. | 49.363193 |
(PHP 3 >= 3.0.6, PHP 4, PHP 5)str_replace -- Replace all occurrences of the search string with the replacement string
This function returns a string or an array with all occurrences of
replaced with the given
replace value. If you
don't need fancy replacing rules (like regular expressions), you should
always use this f... | <urn:uuid:663c918c-ba21-4de1-8bde-ba099e808915> | 3.03125 | 338 | Documentation | Software Dev. | 65.791226 |
By courtesy of Image Google
The Culebra Island giant Anole is another fascinating animal. The scientific name is Anolis Roosevelti. An another name for the Giant Anole is Xiphosurus Roosevelt. They where listed as endangered on July 21, 1977. The Anole is extremely rare, but some people think that they can even be exti... | <urn:uuid:e3f92d38-2b5a-474a-9c8c-a06fb501def2> | 2.96875 | 151 | Knowledge Article | Science & Tech. | 55.006105 |
Table of Contents:
e is one of those special numbers in mathematics, like pi, that keeps showing up in
all kinds of important places. For example, in Calculus, the function f(x) = c(ex) for any constant c is the one function (aside from the zero function) that is its own derivative. It is the base of the natural logari... | <urn:uuid:0d4cd3d8-d468-4973-b6a8-5d4d864579f6> | 3.4375 | 240 | Knowledge Article | Science & Tech. | 53.8325 |
(sorry about bad drawing - my GIMP skills are hopeless)
But yeah, that hopefully explains depression and elevation. Looking up from the direct line - that is the horizontal area that is 0 degrees is the elevation point (so it's out of proportion on my picture).
Now Height X is equal to 50.2 metres (which is given in th... | <urn:uuid:8b3c1e96-9790-4a7f-833c-5d0f4f9d86fd> | 3.4375 | 235 | Q&A Forum | Science & Tech. | 86.959367 |
Phys. Rev. Focus28, 12 (2011) – Published September 23, 2011
Experimentalists have mapped the quantum states (band structure) of cold atoms mimicking electrons in a crystal. The technique should allow researchers to study new aspects of electrons in crystals using the atoms as a model.
Phys. Rev. Focus26, 25 (2010) – P... | <urn:uuid:8cd230ed-a192-4764-b92e-2e06e10ed1c4> | 3.703125 | 250 | Content Listing | Science & Tech. | 53.246854 |
The classic Poisseuille flow approach is a fine approximate solution for situations that satisfy its assumptions. The effect of gravity can be accounted for well by including it in the pressure-drop term. It should work fine for water being sucked through a soda-straw.
Surface tension forces won't be large for water or... | <urn:uuid:84e52bbe-cea0-403f-9cbb-cab4d11185b5> | 2.796875 | 375 | Q&A Forum | Science & Tech. | 50.813513 |
Our office has recently discovered the brilliance of StumbleUpon
. We realized that we can not only use it to discover some great news and information on the very things PNS Energy is interested in, but we can also use it to waste some time when the brain can handle no more.
Among the first things we “stumbled” upon we... | <urn:uuid:2c36c7d6-4fb4-42dd-a51f-561f3c99fe7b> | 2.875 | 829 | Personal Blog | Science & Tech. | 45.812464 |
Fun Solar System Facts
The solar system has provided mysteries for scientists, philosophers, and religious leaders to ponder for millennia. In ancient times, the visibility of planets in the sky signified omens, while in the twentieth century, man landed ships on the moon and explored Mars and beyond with space probes.... | <urn:uuid:75c1bf26-ff10-49b9-bff8-1ac4818cc180> | 3.65625 | 913 | Listicle | Science & Tech. | 46.936818 |
Today the Sun stands still at 05:30 UT.
Halting its steady march toward southern declinations and
begining its annual journey north, the event is known as
In the northern hemisphere
December's solstice marks
the astronomical start of winter.
And if you're in
the Great Basin Desert outside of
Lucin, Utah, USA, near sols... | <urn:uuid:ed9cc109-fe40-406a-9f7d-b07775bf71a8> | 3.28125 | 251 | Knowledge Article | Science & Tech. | 52.055323 |
calculusArticle Free Pass
calculus, branch of mathematics concerned with the calculation of instantaneous rates of change (differential calculus) and the summation of infinitely many small factors to determine some whole (integral calculus). Two mathematicians, Isaac Newton of England and Gottfried Wilhelm Leibniz of G... | <urn:uuid:b67f09fa-051d-4489-b241-eab3699be279> | 3.75 | 951 | Knowledge Article | Science & Tech. | 41.546316 |
Microsoft introduced table variables in SQL Server. Table variables are used instead of temporary tables. Similar to temp tables, we can use table variables to store data that we used to store in temp tables.
The following statement is used to declare a Table variable, which is pretty similar to a CREATE TABLE statemen... | <urn:uuid:1564cddd-ab86-40af-bedf-78e6a24a3be3> | 3.015625 | 326 | Tutorial | Software Dev. | 29.419333 |
Whether it's true or false value returned by >>> will never be negative Answer is false and they give following explantion. for RHS of 32, no shifting will be done and same(if-ve then -ve and if +ve then +ve) Can somebody explain me what is mean by RHS of 32 by giving an example. Is this related to int widht? Thanks in... | <urn:uuid:c4691731-c76f-4fbc-85ab-28585dab9e3b> | 3.5625 | 193 | Q&A Forum | Software Dev. | 91.713851 |
| VOL. 23, NO. 18||MARCH 27, 1998 |
Prof. Brian Greene:
A Universe of at Least 10 Dimensions
String Theory Finally Reconciles Theories of Relativity and Gravity
BY VIRGIL RENZULLI
|String theory requires at least six extra spatial dimensions tightly curled-up to microscopic size. Here we see two such dimensions, curled... | <urn:uuid:ca041187-16fb-4e33-ae7e-f2b5babca7c2> | 3.015625 | 1,994 | Audio Transcript | Science & Tech. | 43.795419 |
Ice age to warming - and back?
The Little Ice Age and "the 8,200-year event" are not exactly household terms. Once only a handful of climate scientists puzzled over these episodes of abrupt climate change. Now, the topic is getting close scrutiny from the Pentagon, the halls of Congress, and even Hollywood - where a di... | <urn:uuid:77f1a2b3-152f-4c4d-918e-048d5e8f5fd3> | 3.1875 | 830 | Truncated | Science & Tech. | 40.558588 |
Physics jokes, humor, and cartoons from Jupiter Scientific; Links to science jokes, astronomy jokes, biology jokes, and chemistry jokes.
Press Releases |
If you didn't get the joke, you probably didn't understand the science behind it. If this is the case, it's a chance for you to learn a little physics.
Physics Joke 1... | <urn:uuid:29954a06-02e8-4ffc-87ac-6b712614914e> | 2.953125 | 3,790 | Content Listing | Science & Tech. | 56.044996 |
- Inferring extinction of mammals from sighting records, threats, and biological traitsDiana O Fisher
The University of Queensland, School of Biological Sciences, St Lucia 4072, QLD, Australia
Conserv Biol 26:57-67. 2012..Our new method can be used to test whether species with few records or recent last-sighting dates ... | <urn:uuid:b5d2c02c-82b1-46bb-96ac-7d5a77ca894f> | 2.953125 | 228 | Content Listing | Science & Tech. | 44.542632 |
Physical Science: Session 7
A Closer Look: Why do We Need Heated Towel Racks?
In this video, weather forecaster Bill Babcock tells us that, when we step out of the shower, it takes energy from our skin to turn liquid water into water vapor via evaporation. To understand this process better, let's take a closer look at ... | <urn:uuid:3dc1f776-5840-44ac-a585-d39200a1c375> | 3.5 | 427 | Tutorial | Science & Tech. | 48.432732 |
catch tag form* => result*
Arguments and Values:
tag---a catch tag; evaluated.
forms---an implicit progn.
results---if the forms exit normally, the values returned by the forms; if a throw occurs to the tag, the values that are thrown.
catch is used as the destination of a non-local control transfer by throw. Tags are ... | <urn:uuid:36821fd4-14ce-49b4-aa63-6bc823da420f> | 3.4375 | 435 | Documentation | Software Dev. | 68.163816 |
Science Behind the Energy Network
|Dr. Robert Ulanowicz, creator of the Energy Network for the
All the essential components of life — DNA, proteins, enzymes, fats, and most notably, carbohydrates (sugars) — are built with carbon molecules. Carbon supports every living thing on our planet, beginning with plants, which p... | <urn:uuid:1cf9166d-1f44-42ac-933e-473b22cbf4e7> | 3.734375 | 560 | Knowledge Article | Science & Tech. | 35.511899 |
Crystal System: Hexagonal,Trigonal
Status of Occurrence: Confirmed Occurrence
Distribution: Locally Abundant
Chemical Composition: Magnesium silicate hydroxide
Chemical Formula: Mg3Si2O5(OH)4
Method(s) of Verification: Anglesey – XRD (Maltman, 1977); Rhiw – XRD (Natural History Museum, no. 5920F).
- Hydrothermal: serpe... | <urn:uuid:a1a60bcc-2f71-49cc-87eb-b6252677fa94> | 2.984375 | 497 | Knowledge Article | Science & Tech. | 20.799032 |
The wooden hearts of two cedar trees hold a 1200-year-old cosmic mystery – evidence of an unexplained event that rocked our planet in the 8th century.
Cosmic rays are subatomic particles that tear through space. When they reach Earth they react with the oxygen and nitrogen in the atmosphere, producing new particles. On... | <urn:uuid:befec93b-23a0-456f-9cef-17fe8aa2044f> | 3.890625 | 839 | Comment Section | Science & Tech. | 56.399516 |
The Earth and the dark star that is the second foci of the 12th Planet's orbit do not rotate around each other any more than the planets in your Solar System rotate around each other. The reason for the latter is that the Sun dominates the planets, and their influence on each other becomes the lesser voice.
In like man... | <urn:uuid:a03bf646-08d3-4c28-b897-f56f4c5dad1a> | 2.96875 | 503 | Nonfiction Writing | Science & Tech. | 51.972634 |
[Click to envioletenate.]
Pretty cool. First, of course, the purple color is not real. It’s just the color Andre chose for this picture when he processed it. Second, he used an Hα filter, which lets through a very narrow slice of light (actually in the red part of the spectrum). This color is emitted by warm hydrogen, ... | <urn:uuid:a2e5f62d-640b-4700-b51f-90476d78e906> | 2.875 | 355 | Personal Blog | Science & Tech. | 63.211283 |
Electromagnetic Radiation & Electromagnetic SpectrumThe word light usually makes one think of the colors of the rainbow or light from the Sun or a lamp. This light, however, is only one type of electromagnetic radiation. Electromagnetic radiation comes in a range of energies, known as the electromagnetic spectrum. The ... | <urn:uuid:c7be2f21-5a79-42a7-be0f-13d2128e8136> | 3.875 | 277 | Knowledge Article | Science & Tech. | 42.838725 |
1 Using HTML and CSS
Formatting and semantic markup
You can set the font to whatever typeface you wish, but be aware that obscure fonts are unlikely to exist on most people's computers. Also note that fonts whose names have spaces in them must be surrounded by single quotes.
Result: Times New Roman
You can (and usually... | <urn:uuid:7c6ee958-9be5-49ce-820c-db453e93a205> | 3.25 | 646 | Tutorial | Software Dev. | 46.390099 |
||This article needs additional citations for verification. (April 2013)|
An approximation is a representation of something that is not exact, but still close enough to be useful. Although approximation is most often applied to numbers, it is also frequently applied to such things as mathematical functions, shapes, and... | <urn:uuid:afb43d97-6b36-4686-939c-20e6a1159c80> | 4.0625 | 1,096 | Knowledge Article | Science & Tech. | 22.522635 |
Black Holes seem to have bad press that is largely undeserved. This lecture with professor Ian Morison explains what Black Holes are, and how we can discover them even through they can’t be seen.
This program was recorded in collaboration with Gresham College, on October 27, 2010.
Gresham Professor of Astronomy Ian Mor... | <urn:uuid:406a3f7f-d821-4560-8d86-14aa65ba3f34> | 3.390625 | 243 | Content Listing | Science & Tech. | 34.047292 |
Tag: "rainforest" at biology news
Endangered frogs coexist with fungus once thought fatal
...that remaining populations of T. eungellensis , a rainforest
frog listed as endangered, can persist in the wild...ocused on six species living in the high-elevation rainforest
streams of Eungella National Park in Queensland, Au... | <urn:uuid:0a1903c4-dba6-4848-8cfd-7d99b711e780> | 2.734375 | 1,571 | Content Listing | Science & Tech. | 52.362463 |
Go behind the scenes and into SERC’s photobiology lab. This is where photobiologist Pat Neale spends a great deal of time examining the impact of UV radiation on photosynthesis. In this video you’ll get a look at one experiment that seeks to determine what would happen to the ocean’s phytoplankton if the ozone layer wa... | <urn:uuid:860fdba3-5704-4d56-876e-0a69bc7454fb> | 3.0625 | 123 | Truncated | Science & Tech. | 40.83514 |
What is the basic difference between Factory and Abstract Factory Patterns?
With the Factory pattern, you produce implementations (
With the Abstract Factory pattern, you produce implementations of a particular Factory interface -- e.g.,
Factory pattern: The factory produces IProduct-implementations
Abstract Factory Pa... | <urn:uuid:199abad0-449a-4a41-8d6c-837ed64c6025> | 3.8125 | 1,461 | Q&A Forum | Software Dev. | 37.908879 |
Science subject and location tags
Articles, documents and multimedia from ABC Science
Tuesday, 30 April 2013
Proto-dinos Ten million years after the world's largest mass extinction, a lineage of animals thought to have led to dinosaurs took hold in what is now Tanzania and Zambia, according to new research.
Friday, 19 ... | <urn:uuid:73da7f80-3b37-4bd8-96d5-ce20ad388087> | 2.78125 | 521 | Content Listing | Science & Tech. | 34.284428 |
A demonstration in chemistry class goes awry when open flame sets off the sprinkler system.
A simple chemical reaction, known around the world for decades, has the ability to send chills down your spine if you've never seen it before.
Low fat chocolate is an abomination. Chocolate is more than a flavor: that luscious m... | <urn:uuid:68dcc29e-30a4-4615-9285-061cd8de8c91> | 3.109375 | 498 | Content Listing | Science & Tech. | 54.959058 |
Click on the headline (link) for the full text.
Many more articles are available through the Energy Bulletinhomepage
How to survive the coming century
Gaia Vince, New Scientist
... Fearing that the best efforts to curb greenhouse gas emissions may fail, or that planetary climate feedback mechanisms will accelerate warm... | <urn:uuid:748cd896-fd3d-446b-9b9f-b7d4bd9fdbba> | 3.28125 | 1,003 | Content Listing | Science & Tech. | 39.772522 |
The International Space Station - The Cost Of Waiting
shuttle crew iss progress
In mid-2003 the U.S. Congress asked the General Accounting Office (GAO) to assess the effects of shuttle launch delays on the ISS. The GAO is an investigatory agency of the Congress. In September 2003 the GAO released a report titled Space ... | <urn:uuid:9bfbc0da-138f-4815-9ae3-22629e006c16> | 2.984375 | 2,482 | Knowledge Article | Science & Tech. | 67.874303 |
Courtesy Mark RyanLast October, I attended the Geological Society of America’s annual meeting held here in Minneapolis. The convention presented plenty of opportunities to hear the latest ideas in geology, paleontology, and planetary science but the highlight for me was being able to join a GSA field trip on Lake Super... | <urn:uuid:0b1818d0-5889-4993-afb9-1d2eb399dc7d> | 2.75 | 2,580 | Personal Blog | Science & Tech. | 43.100063 |
Putting Nature’s Power to Work (Aug, 1932)
Putting Nature’s Power to Work
Methods of Harnessing Natural Energy Described by DICK COLE
Upward of 40,000 inventions a year are granted patents by Uncle Sam, but not one of these offers a practical solution of the problem which scientists agree is the most pressing of them a... | <urn:uuid:7c235f07-d18d-4504-9a3a-cadca3bd6a29> | 3.046875 | 2,492 | Personal Blog | Science & Tech. | 48.263128 |