Precritical calculations for the 2.9 in. pitch, twmr critical assembly

Critical loadings and precritical calculations for 2.9 inch pitch core in determining feasibility of isotopically enriched tungsten water moderated reactor for use as nuclear rocke

NATURAL HISTORY AND MERISTICS OF AN ALLOPATRIC POPULATION OF RED CORNSNAKES, PANTHEROPHIS GUTTATUS (LINNAEUS, 1766) IN CENTRAL KENTUCKY, USA

Life history, morphological variation, and basic biology of Pantherophis guttatus (Linnaeus, 1766), the Red Cornsnake, are not well known, particularly for the allopatric populations in Kentucky. To address some of the information gaps for this species, we report field observations, including activity patterns, reproduction, and meristics of P. guttatus in Kentucky. In 2003 and 2004 we conducted field surveys using drift fences, artificial cover, manual searching, and driving on roads and captured 101 P. guttatus in Edmonson and Hart counties, Kentucky. We found that artificial cover was the best method of detection with 77% of snakes captured using this method. Numbers of encounters peaked in April-May and August-September suggesting bimodal activity patterns similar to other colubrid snakes. Males had signifi cantly higher subcaudal scale counts than females while females had significantly higher ventral scale counts than males. We detected more individuals in 2003 than in 2004, most likely influenced by severe drought conditions in Kentucky during 2004. Size-class distribution of snakes was skewed towards large individuals (> 70 cm SVL). The absence of individuals in juvenile size classes (30 cm -70 cm) may be an artifact of lower detection probabilities for smaller size classes, different habitat use by juveniles, or may indicate low recruitment

Temperature acclimation in Tilapa Sparrmanii: some effect of Thiourea

Zoologia Africana 3(1): 95-10

Precritical calculations for the 3.0 in. pitch, beryllium reflected, TWMR critical assembly

Feasibility of isotopically enriched tungsten, water moderated reactor for nuclear rocke

Problem Set #10

Blackbod

Structure of matter, 3

The particle zoo Prior to the 1930s the fundamental structure of matter was believed to be extremely simple: there were electrons (each with mass about 0.5 MeV), e− , photons (no mass), γ , and protons (mass about 938 MeV), p+ . Starting in 1932 the world began to get a lot more complicated. First came Dirac’s positron ( e+ , with same mass as the electron), postulated in 1928 but mostly ignored until Anderson’s accidental discovery (see SM 1). Soon after, the neutron ( n ) was identified (mass about 940 MeV). In beta decay, the neutron transforms into a proton and an electron. The energy of the electron in beta decay has a maximum cutoff and is otherwise “never” observed to be the same–as it would be if there were only two products. It is almost as if energy is not conserved in beta decay. In 1930, Wolfgang Pauli proposed that a third, unseen, particle was also emitted and that the three products conserved energy and momentum by sharing them in a variety of unpredictable ways. The new particle would have to have spin-1/2 (because the neutron, proton, and electron all have spin-1/2 and not even the crazy rules of addition in quantum mechanics allow 1/2 +1/2 = 1/2 ) and be electrically neutral (because the neutron is neutral and the proton plus electron is also neutral). Eventually, Pauli’s particle–the neutrino, ν –was directly detected in the 1950s. This set of particles was all that was needed to make sense of nuclei and their properties

Special relativity, 3

A few kinematic consequences of the Lorentz transformations How big is gamma

Special relativity, 4

More kinematic consequences of the Lorentz transformations Light cones: A “light cone” is a set of world lines corresponding to light rays emanating from and/or entering into an event

Physics 3710: Intermediate Modern Physics

Physics 3710 is about the principles and applications of special and general relativity and of the nuclear and sub-nuclear structures of matter. Though some of the topics of 3710 are more than 100 years old, others continue to rapidly evolve—and their interplay provides a fascinating, living example of science at work. Moreover, the course is predicated on, and aspires to convey, two thoroughly modern, coherent, and interconnected themes: (1) the largest (e.g., stars, galaxies, and galactic clusters) and smallest (e.g., quarks, leptons, and force-carrying bosons) observed forms of matter are intimately related to one another; and (2) dynamics, conservation laws, and symmetry are all essentially equivalent