SPA-2014 - 37th Conference on Stochastic Processes and their Applications
Pierre Bosch, LilleInfinite divisibility of the negative powers of the Beta distributions I propose to study the infinite divisibility of the negative powers of the Beta and the Gamma distributions. Marcelo Magnasco, RockefellerA phase transition in the first passage of a Brownian process through a fluctuating boundary with implications for neural coding Finding the first time a fluctuating quantity reaches a given bound- ary is a deceptively simple-looking problem of vast practical im- portance in physics, biology, chemistry, neuroscience, economics, and industrial engineering
Top of page How do people come in contact with plutonium? Residual plutonium from atmospheric nuclear weapons testing is dispersed widely in the environment. Top of page Protecting People from Plutonium What can I do to protect myself and my family from plutonium? Since plutonium levels in the environment are very low, they pose little risk to most people
The primary cellular components are lymphocytes and macrophages, and the primary molecular components are antibodies and lymphokines; granulocytes and complement system are also involved in immune responses, although they are not always considered as part of the immune system per se. The great, or gastrocolic, omentum forms, in most mammals, a great sac, which is attached to the stomach and transverse colon, is loaded with fat, and covers more or less of the intestines
In most applications (such as textile mills) this use has been replaced by safer beta emitters, but it has remained in use in applications where products are very sensitive to radiation exposure especially photographic film plants. This occurs automatically in the vast majority of the world's reactors since they use low-enriched or natural uranium as fuel, which consists mostly of U-238
Ask the Physicist!
This problem has recently been solved by measurements which find that the neutrino is not really massless but has an extremely small mass (much smaller than the electron, the lightest of "everyday" particles). The high temperatures are required so that the positive ions have enough energy (that is enough speed) to overcome the electric repulsion from other positive ions
Trigonometric functions Originally, the names given to the 6 possible ratios between pairs of sides in a right-angled triangle (sine, cosine, tangent, cotangent, secant, cosecant). Inclination, orbital--the angle between the orbital plane of a satellite or planet and some reference plane, usually linked to the center of attraction (e.g
Health effects of ionizing radiation
In the first process, a uranium or a plutonium atom captures a neutron and splits (undergoes nuclear fission) into two radioactive fission fragments plus two or three neutrons. Radioactive material can also reach surface waters when airborne radioactive materials settle to the earth or are brought down by rain or snow, and when soil containing radioactive material is washed away into a river or lake
Nuclear energy and binding energies In the same way that chemical reactions can be classified as exothermic (releasing energy) or endothermic (requiring energy to react), so nuclear reactions may either release or use up energy. If the early universe was almost nothing but hydrogen atoms, whose nuclei are protons, where did all those neutrons come from? The answer is that there is another nuclear force, the weak nuclear force, that is capable of transforming neutrons into protons and vice-versa
Build an Atom - Atomic Structure, Atoms, Atomic Nuclei - PhET
Excellence Center of Science and Mathematics Education at King Saud University King Saud University seeks to become a leader in educational and technological innovation, scientific discovery and creativity through fostering an atmosphere of intellectual inspiration and partnership for the prosperity of society. Original Sim and Translations About Topics Atoms Atomic Structure Isotope Symbols Atomic Nuclei Description Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change
In 1886, Eugen Goldstein discovered canal rays (also known as anode rays) and showed that they were positively charged particles (ions) produced from gases. Chadwick in England repeated the experiments and found that they could be explained if one made the assumption that uncharged particles of mass approximately equal to that of a proton were emitted from the nuclei of the bombarded material
Beta Decay - Beta Decay, Radioactivity, Antineutrinos - PhET
Excellence Center of Science and Mathematics Education at King Saud University King Saud University seeks to become a leader in educational and technological innovation, scientific discovery and creativity through fostering an atmosphere of intellectual inspiration and partnership for the prosperity of society
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