Heat pipe cooling of power processing magnetics

A heat pipe cooled transformer and input filter were developed for the 2.4 kW beam supply of a 30 cm ion thruster system. This development yielded a mass reduction of 40% (1.76 kg) and lower mean winding temperature (20 C lower). While these improvements are significant, preliminary designs predict even greater benefits to be realized at higher power. The design details are presented along with the results of thermal vacuum operation and the component performance in a 3 kW breadboard power processor

Monte Carlo simulation of the classical two-dimensional one component plasma

Monte Carlo simulation, lattice dynamics in the harmonic approximation, and solution of the hypernetted chain equation were used to study the classical two-dimensional one component plasma. The system consists of a single species of charged particles immersed in a uniform neutralizing background. The particles interact via a l/r potential, where r is the two dimensional separation. Equations of state were calculated for both the liquid and solid phases. Results of calculation of the thermodynamic functions and one and two particle correlation functions are presented

Analysis of the treatment of World War II in ten junior high school American history textbooks.

Thesis (M.A.)--Boston Universit

Hail Dartmouth : March Song

https://digitalcommons.library.umaine.edu/mmb-ps/1786/thumbnail.jp

An intelligent allocation algorithm for parallel processing

The problem of allocating nodes of a program graph to processors in a parallel processing architecture is considered. The algorithm is based on critical path analysis, some allocation heuristics, and the execution granularity of nodes in a program graph. These factors, and the structure of interprocessor communication network, influence the allocation. To achieve realistic estimations of the executive durations of allocations, the algorithm considers the fact that nodes in a program graph have to communicate through varying numbers of tokens. Coarse and fine granularities have been implemented, with interprocessor token-communication duration, varying from zero up to values comparable to the execution durations of individual nodes. The effect on allocation of communication network structures is demonstrated by performing allocations for crossbar (non-blocking) and star (blocking) networks. The algorithm assumes the availability of as many processors as it needs for the optimal allocation of any program graph. Hence, the focus of allocation has been on varying token-communication durations rather than varying the number of processors. The algorithm always utilizes as many processors as necessary for the optimal allocation of any program graph, depending upon granularity and characteristics of the interprocessor communication network

Birth Outcomes In Georgia: Socioeconomic and Ecological Analyses of Low Birth Weight, 2000-2006

Despite advances in medical and preventive care in the U.S., the low birth weight percentage continues to rise in the U.S. and the state of Georgia. The purpose of this study was to examine the relationship of socioeconomic status, county type (rural vs. urban), and adequacy of prenatal care on low birth weight in the state of Georgia for the years 2000 to 2006. The study also applied practical methods such as spatial analysis and geographic information systems (GIS) in order to pinpoint the at-risk populations for adverse birth outcomes. This study involved the use of secondary data analysis, specifically vital records, to examine the relationships between socioeconomic status, adequate prenatal care, gestational age, and birth weight, controlling for certain maternal characteristics such as age, race, marital status, and education, for infants born in the state of Georgia. Ecological analyses were also conducted using the Georgia OASIS Mapping Tool from the Georgia Division of Public Health. Statistically significant associations were found for the maternal characteristics of age, race, and marital status. Mean birth weight was lower for those mothers who were African American, unmarried, and were either under the age of 19 or over the age of 40. The number of education years completed by the mother was also significant; as the level of education increased birth weight of the infant also increased. Logistic regression results found that there were associations between the three variables of interest and birth weight; socioeconomic status, county type, and adequacy of prenatal care. Based on the analyses, the women in the study population with the worst low birth weight outcomes were: women of advanced maternal age, unmarried women, African American women, women with adequate plus level of prenatal care, lower middle and lower socioeconomic strata, and women living in rural counties. Based on the results of the ecological analysis, the women who are most at-risk can be found primarily in southwestern counties of Georgia. Future research is needed to evaluate existing programs throughout Georgia that may provide additional important pieces of data to confirm the results of this study