Measurement of neutron spectra in liquid hydrogen final report

Neutron spectrum measurement in liquid hydrogen and wate

A Modern Approach to Elementary Analysis

Recall, on the one hand, that mathematics has grown up in the past one hundred fifty years. With the acceptance of non-euclidean geometrics, of algebraic structures beginning with groups, and of symbolic logic, the very idea of what mathematics is had to change. It took a while for mathematicians to digest the ideas of men like Lobachevski, Galois, and Boole. The Bourbaki notion of mathematics as a \u27storehouse of structures\u27 is new in the last few decades

The Mediating Influence of Role Stress on the Relationship between Adult Attention Deficit and Self-Efficacy

Adult Attention Deficit Disorder (AAD) and stress are pervasive and significant experiences with harmful consequences for both employees and organizations as a whole. This research study proposes a network of significant relationships between AAD, role stress, and self-efficacy. Adults who are experiencing the core symptoms of AAD (difficulties with task activation, concentration, effort, emotional interference, and accessing memory) are less likely to manage their role effectively and develop selfefficacy. The correlations between AAD and both role stress (r = 0.49, p \u3c 0.01) and self-efficacy (r = -0.32, p \u3c 0.01) were statistically significant, as was the correlation between role stress and self-efficacy (r = -0.44, p \u3c 0.01). The Sobel test (Z = 6.57, p \u3c 0.00) provides support for the hypothesis that role stress mediates the relationship between AAD and self-efficacy. A significant partial correlation between AAD and self-efficacy (r = -0.15, p = 0.02) remains after inclusion of the mediator (role stress), which limits the finding to partial mediation. Future research needs to draw samples from a variety of work situations

Agile: From Software to Mission System

The Resource Prospector (RP) is an in-situ resource utilization (ISRU) technology demonstration mission, designed to search for volatiles at the Lunar South Pole. This is NASA's first near real time tele-operated rover on the Moon. The primary objective is to search for volatiles at one of the Lunar Poles. The combination of short mission duration, a solar powered rover, and the requirement to explore shadowed regions makes for an operationally challenging mission. To maximize efficiency and flexibility in Mission System design and thus to improve the performance and reliability of the resulting Mission System, we are tailoring Agile principles that we have used effectively in ground data system software development and applying those principles to the design of elements of the mission operations system

Letter from Eiler Freece

Letter concerning qualifications for a position at the Utah Agricultural College, including references

The Adsorption of Negative Ions by Colloidal Suspension of Aluminum Hydroxide

The adsorption of Ferricyanide and Oxalate ions by colloidal aluminium hydroxide at concentrations below and above the coagulation values is measured. The plot of the amount adsorbed as a function of the total concentration of the electrolyte shows three characteristic breaks. The results are of the same general type as obtained by Storks in the adsorption of the Chromate ion by the same suspension. The adsorption is considered as of two types; first, a neutralization of the positive charges on the colloidal particle, followed by surface adsorption by the coagulated particle. The second break is due to a combination of the two types of adsorption

Core-Collapse Simulations of Rotating Stars

We present the results from a series of two-dimensional core-collapse simulations using a rotating progenitor star. We find that the convection in these simulations is less vigorous because a) rotation weakens the core bounce which seeds the neutrino-driven convection and b) the angular momentum profile in the rotating core stabilizes against convection. The limited convection leads to explosions which occur later and are weaker than the explosions produced from the collapse of non-rotating cores. However, because the convection is constrained to the polar regions, when the explosion occurs, it is stronger along the polar axis. This asymmetric explosion can explain the polarization measurements of core-collapse supernovae. These asymmetries also provide a natural mechanism to mix the products of nucleosynthesis out into the helium and hydrogen layers of the star. We also discuss the role the collapse of these rotating stars play on the generation of magnetic fields and neutron star kicks. Given a range of progenitor rotation periods, we predict a range of supernova energies for the same progenitor mass. The critical mass for black hole formation also depends upon the rotation speed of the progenitor.Comment: 16 pages text + 13 figures, submitted to Ap