SNELL, JOHN snell, willebrord (15911626), commonly known as snellITJS, Dutchastronomer and mathematician, was born at Leiden in 1591. In http://84.1911encyclopedia.org/S/SN/SNELL_JOHN.htm
Extractions: American pit-vipers by the possession of a loreal shield, i.e. a shield intercalated between the two preoculars and the posterior nasal; below the loreal lies the pit. The moccasin and the water-viper have occasionally been mentioned under the name of Trigonocephalus cenchris, one of the many synonyms. Lachesis has the upper surface of the head covered, with very small shields, or with scales, and contains about 40 species, in S. and Central America, the Antilles and also in SE. Asia. The most ill-famed is L. s. Bothrops s. Craspedocephalus lanceolatus, which inhabits the greater part of S. America, extending into Mexico and the Lower Antilles. notably Martinique, Guadaloupe and Santa Lucia, where it is known as the Fer de Lance ; Mexicans call it rabo de hueso or bone-tail, on account of the curiously coloured and spike-like tip of the tail. It is a very quick and highly irascible beast and even known to turn on its pursuer. It grows to a length of 6 ft., lives in swamps, plantations, forests, on the plains and on the hills, and is very prolific, ploducing dozens of young, which at birth are 10 in. long and as vicious as their parents. L. s Trimeresurus gramineus s. viridis s. erythurus is one of the Asiatic species, ranging over the whole of India to Hong-kong, Timor and even to the Andaman and Nicobar Islands. It is arboreal, bright green above; the end of the prehensile tail is usually bright
Snell's Law and the angles that the reflected and transmitted rays make (the angles of reflectionand transmission, respectively) was discovered by willebrord snell. http://www.earth.nwu.edu/people/seth/demos/SNELL/snell.html
Extractions: Demonstrate Snell's Law Show that the the coefficients of reflection and transmission depend on incidence angle One of our most important methods for learning about the Earth's interior is the study of seismic waves ; energy that travels through the Earth in the form of sound. The existence of the Mohorovicic layer, the liquid outer core of the Earth and the solid inner core were all deduced from sound waves that had traveled through the Earth, interacting with the layers. Because of the way that seismic energy propagates through the Earth, we know that the entire interior, with the sole exception of the outer core, is solid. In mineralogy , the way that light is transmitted through a crystal is a diagnostic tool. By measuring the refractive index (the way the light bends as it moves from mineral to another) and the motion of Becke lines , a mineralogist can determine the difference between crystals of quartz and calcite. But how are these differences detected? And what causes them? When a wave of energy comes to a place where two layers meet (called an interface ), the energy can go two directions. If the energy bounces off of the interface and stays in the first medium, then it is said to be
SEISMOLOGY available soon. Related pages A biography of Joseph Fourier; A (welldone)snell's Law program; A Biography of willebrord snell; Seismic http://www.earth.nwu.edu/people/seth/demos/Slides/sseis.html
Extractions: Computer simulation of wave reflection and transmission on string (normal-mode simulation of waves on a string with an internal boundary [Geller and Stein, 1978]) Light beams in a tank with a protractor back, containing air and water, display both Snell's law (from the angles the beams make) and angle dependance of the reflection coefficient (from beams' brightness). Standard wave (ripple) tank demonstrations for basic wave propagation, and local variants including using the disk (from the moment of intertia demonstration) as a "core" about which diffractions can be seen. Classic "Slinky" shows P and S wave particle motions A stretched rubber band shows the effects of the shear modulus and density on shear wave velocity Finding room size with inexpensive electronic (acoustic) distance measurement device illustrates using travel times to infer structure Video simulation demonstrates relation between seismic waves in the earth and specific wave phases (e.g. ScS) [ Wysession and Shore, 1994 To Seth Stein's Homepage To John DeLaughter's Homepage Wave propagation on a string Snell's Law Wave speed on a rubber band Travel Time measurements
HOKIE.US willebrord snell. CHORUS willebrord snell, willebrord snell, studied pathsof rays When light move from a medium, it bends along the way Hey! http://www.hokie.us/
Extractions: Welcome... It took me a while, but I've finally secured my own little space on the internet. With an address like hokie.us , you would probably think that this site is about hokies or maybe the US, but you would be wrong...well, not necessarily wrong, but mostly not right. I guess this page is about a hokie who also happens to be a darned proud american, but that's about as far as that goes. It would have been more appropriate if this site were sonny.us or sonny.com because this site is all about me, Sonny. Unfortunately, those web addresses were all taken, so I'm going to squat here and hope that I'll be lucky enough to get some misdirected traffic. Enjoy...oh, and if you ever want to contact me, you can write me at slouie@vt.edu or find me on AOL instant messenger (CODENAME: thenewsonny). 24 March 2003 - 11:35 PM I just got back from class though, and I have a loooong day ahead of me tomorrow. So I think I'm going to split and I'll give you an update before week's end. Bye. 19 March 2003 - 9:55 PM - So have you all been watching the news? The President is supposed to address the nation in less than a half hour, and I've just been watching all of the news channels all afternoon. It's interesting seeing what everyone has to say, though I'm not sure exactly what to think about it all right now. I think back to the Gulf War a decade ago, and it's amazing how little I remember of it. I definitely have a different perspective on things these days, but I don't know. I don't know. I think I'll be up for a while though.
Snell Home Page willebrord snell By Brooke Metcalf Biography. http://www.angelfire.com/scifi/concordiasci/snell/snell.html
Science Experiments On File ( Save Experiment ). Key Terms, Topics, and Principles snell,willebrord . Historical Experiments. Light And Sound. http://www.fofweb.com/Onfiles/SEOF/MainPage.asp?SID=17&MainDesc=Snell, Willebror
Science Experiments On File Sap, Movement In Plants. Separation. Sex Linkage In Fruit Flies. snell, willebrord.Sound. Spontaneous Generation, Disproving Theory Of. Springs, Elasticity Of. http://www.fofweb.com/Onfiles/SEOF/MainPage.asp?SID=16&ExpType=Historical Experi
Extractions: Snell, George Davis Snell, George Davis, , American immunologist, b. Bradford, Mass., Ph.D. Harvard, 1930. He was associated with the Jackson Laboratory in Bar Harbor, Maine from 1935 to 1973. His identification of the H-2 gene complex in mice helped make future organ transplants possible. Snell, Jean Dausset , and Baruj Benacerraf shared the 1980 Nobel Prize in Physiology or Medicine for their discoveries concerning the genetic basis of immune system responses. His work greatly increased the understanding of autoimmune diseases and histocompatability (see transplantation, medical
Optics 5 Ray optics may be said to have begun as a science with the discovery of the lawof refraction by willebrord snell in 1621 and its description in mathematical http://www.ee.umd.edu/~taylor/optics5.htm
Extractions: ....Optics Highlights V Ray Optics, Corpuscles and Waves R Willebrord Snell René Descartes (1596-1650) was the great philosopher and mathematician of the first half of the 17 th century. Although he was nominally a Roman Catholic and held rank in the lower nobility, he spent much of his adult life outside of France, principally in the Protestant low countries, seemingly in fear of the persecutions of heretics that swept France. Indeed, his works were put on the proscribed list shortly after his death. Cartesian physics was mechanistic and deterministic, all matter and light consisted of infinitely divisible substances, set into initial vortice-like motion by God. Light was described as consisting of tiny globes that travel and bounce according to the laws of optics; color was due to the different spins of the globes Pierre de Fermat (1601-1665) the son of a leather merchant, studied law at the University of Toulouse and worked as a lawyer and councilor to the local parliament in Toulouse. He devoted his free time to mathematics. He only published one minor paper, and his work in number theory, probability, and geometry would have been lost had his son not published his letters and notes after his death. Fermat corresponded with both Descartes and Pascal. It is said that Descartes was enraged when he sent him his work on the principle of least time and criticized Descartes work on optics, which was based on the assumption that light travels faster in a denser medium.
Re: I Need Info On Snell!!!!!! I think it was willebrord wasn't it? Check out the site below, it has lots of goodbiographical info. willebrord van Roijen snell. Follow Ups Post a Followup. http://www.sasked.gov.sk.ca/forum/science/archive/messages/110.html
Extractions: Follow Ups Post Followup Evergreen Science Education Dicussion Area FAQ Posted by Lynn Anderson on April 24, 1997 at 08:46:44: In Reply to: I need info on Snell!!!!!! posted by Dale Smith on April 22, 1997 at 15:33:23: I think it was Willebrord wasn't it? Check out the site below, it has lots of good biographical info.
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1Up Info > Mathematics, Biographies - Encyclopedia Riemann, Georg Friedrich Bernhard Sacrobosco, Johannes de Shannon, Claude Smith, Henry John Stephen snell, willebrord snellius, willebrord http://www.1upinfo.com/encyclopedia/categories/mathbio.html
Extractions: Content on this web site is provided for informational purposes only. We accept no responsibility for any loss, injury or inconvenience sustained by any person resulting from information published on this site. We encourage you to verify any critical information with the relevant authorities. Home Contact Us
Il Giardino Di Archimede snell, willebrord - Doctrinae triangulorum canonicae libri quattuor. http://www.math.unifi.it/archimede/archimede/CD_rom/elenco_CD.html
Faces snell, willebrord snell discovered the law of refraction. Stefan, JosephStefan. The StefanBoltzmann law. Stokes, George Stokes. Stokes' theorem. http://faculty.rmwc.edu/tmichalik/faces.htm
Extractions: PHYSICS FACES Ampere Andre Marie Ampere made fundamental contributions to electricity and magnetism. Anderson Carl D. Anderson discovered the positron and the muon in 1932. Balmer Johann Balmer discovered the formula for the hydrogen spectrum. Becquerel Henri Becquerel discovered radioactivity in 1896. Bessel Friedrich Bessel. Bessel functions. Biot Jean-Baptiste Biot. Co-discoverer of the Biot-Savart Law. Bohr Niels Bohr made fundamental contributions to quantum theory. Boltzmann Ludwig Boltzmann made fundamental contributions to statistical mechanics. Born Max Born made fundamental contributions to quantum mechanics. Bose Satyendranath Bose. Bose-Einstein statistics. Bosons! Carnot Sadi Carnot: a pioneer in thermodynamics. Cerenkov Pavel Cerenkov discovered what is now called "Cerenkov radiation". Chadwick James Chadwick discovered the neutron in 1932. Christoffel Elwin Christoffel. Christoffel symbols. Clebsch/Gordan Rudolf Clebsch and Paul Gordan. Clebsch-Gordan coefficients. Compton Arthur Compton explained x-ray scattering from electrons in 1923.
Snell Physics Faces. willebrord snell (15801626) discovered the law of refraction. http://faculty.rmwc.edu/tmichalik/snell.htm
The Science Bookstore - Chronology 1621 AD, snell, W. willebrord snell discovers that light moving fromrarer to denser medium is bent towards vertical snell's Law. http://www.thesciencebookstore.com/chron.asp?searchstring=Snell
The Science Bookstore - Chronology Harriot, Thomas Died 7/2/1621, 1621 AD, Willis, Thomas Born 1/27/1621, 1621 AD,1621 AD, snell, W. willebrord snell discovers and states his law of refraction. http://www.thesciencebookstore.com/chron.asp?pg=4
Pedro Nunes, 1502-1578: Conhecimento Europeu Da Obra Translate this page Nesta obra o famoso matemático holandês willebrord snell (1580-1626)desenvolve as ideias originais de Pedro Nunes sobre a linha de rumo. http://bnd.bn.pt/ed/pedro-nunes/obras/p-nunes-na-europa/pn_conhecimento_manuscri
Why You Dont Believe Fermats Principle Finally, in 1621, willebrord snell, a leading mathematical physicistof the Dutch republican tradition, found the solution. The http://www.21stcenturysciencetech.com/articles/fall01/fermat/Fermat.html
Extractions: Why You Don't Believe Fermat's Principle Laurence Hecht (Full text of editorial from Fall 2001 21st Century Snell's Discovery Fermat's Principle Intention in Nature Confusion over the meaning of the term universal physical principle may be more prevalent in science today than at any time in history. In former times, although great differences existed on this matter, they were usually discussed. Today, we don't even bother. Hence, the most contradictory views coexist within the body of knowledge mis-termed modern science. One of the clearest dividing lines is over the matter of intention in nature. Despite the overwhelming evidence of a purposefulness in natural development, the modern view has replaced the idea of intention with that of mechanism. A theory is called scientific if it provides a credible mechanism, or model, to describe an observable natural phenomena. In one such model, dead objects (often called particles) are assumed to exist and are assigned certain properties, such as attraction, repulsion, or inertia
Snell's Law Related Links Demonstration of the snell's Law , Northwestern University, USA. Biographyof willebrord van Roijen snell , University of St. Andrews, Scotland. http://www.geophys.washington.edu/People/Faculty/kcc/gphys202/links_snells.html
Extractions: Demonstration of the Snell's Law , Northwestern University, USA. Biography of Willebrord van Roijen Snell , University of St. Andrews, Scotland. Circles of Light: The Mathematics of Rainbows , University of Minnesota, USA. Snell's Law from the "The Joy of Visual Perception: A Web Book" by Peter K.Kaiser at York University, Canada. Pacific Northwest United States Sesmicity for the past 30 days from the University of Washington. Reflection and Refraction from the University of New Brunswick, Canada course in Physics 1940. Go Back to the GPHYS202 page.
