Nonadiabatic theory of inelastic electron- hydrogen scattering

Nonadiabatic theory application to inelastic S-wave scattering of low energy electrons from atomic hydroge

Discussant\u27s response to Auditor evidential planning judgments

https://egrove.olemiss.edu/dl_proceedings/1029/thumbnail.jp

Changing patterns of mortality and hospitalized morbidity on the Navajo Indian Reservation.

This is the final report from the Navajo Area Indian Health Service (IHS) on mortality patterns and hospitalized morbidity on the Navajo Indian Reservation. The primary purpose of the study was to document changing causal patterns of morbidity and mortality of the Navajo in order to apprise the IHS of the types of services that are currently most needed, and of needs which may be projected in the near future. The data presented in this study was derived from three sources. The first came from the hospital discharge records of all Navajo patients seen in the IHS and IHS contract hospitals in the IHS Navajo, Phoenix, and Albuquerque Areas from 1972 to 1978. The second data set was population estimates of Navajos residing in different land management districts on the Reservation in 1975. The third set was economic data gathered from a random sample of households from each management district in 1974. The descriptive details of mortality and morbidity are presented in charts and graphic representations. The socioeconomic data were analyzed through multiple stepwise regression, and are presented in a set of regression tables. Relevant comparative and historic demographic data were drawn from the literature and presented in a series of charts and tables. The major findings of the study are as follows: 1) Navajo children\u27s physical health has improved since 1955; 2) the health of elderly patients has declined; 3) preceding observations may be explained as much by changing family, social, and economic patterns, as by any changes in the administration of Indian health care; 4) the incidences of infectious diseases has declined; 5) the instances of accidental death and injury, and mental health related problems have increased; 6) socioeconomic factors impact upon the Navajos in causal terms for most categories of disease or accident; and 7) these same factors affect the Navajo\u27s ability or inability to make themselves available to services. The authors suggest that services be expanded to provide care to the chronically ill and elderly both at home and in nursing homes. In addition, they recommend that IHS prepare to manage programs designed to provide services to children with behavioral, learning, and emotional problems. These children may be referred by families or the schools, which would require institutional linkages and community education programs. The report concludes by suggesting that the development of large scale extractive industries on the reservation increases the opportunity for occupational and environmental hazards, which may have direct impact on the health of the population

Size-Specific Emergence of the Marsh Snail, Littorina irrorata: Effect of Predation by Blue Crabs in a Virginia Salt Marsh

Marsh periwinkles of 5 to 7 mm in shell height were eaten regularly by blue crabs. Fractures marking unsuccessful crab attacks were present in about 25% of medium-sized (10-16 mm) snails and over 60% of larger snails (over 16 mm). Medium-sized snails, subject to predation, leave the water more frequently than larger snails, but only about a quarter of the snail population leaves the water during high tide. We found no evidence that the snails leave the water because they sense blue crabs in the water

Development feasibility study : 450 Western Avenue, Brighton, Massachusetts

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1986.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH.Bibliography: leaf 65.by Mark H. Temkin.M.S

Initial growth of interfacial oxide during deposition of HfO2 on silicon

doi:10.1063/1.1771457Interfacial chemistry of Hf∕Si, HfO2∕SiO2∕Si, and HfO2∕Si is investigated by x-ray photoelectron spectroscopy in order to understand the interfacial layer formation mechanism. Deposition of Hf and HfO2 films was carried out on Si wafers by electron-beam evaporation with oxygen backfill. We show that the interfacial layer formation takes place predominantly at the initial stage of the HfO2 film deposition. Temporary direct bonding between Hf metal and Si is proposed to be the source of the catalytic reaction resulting in formation of interfacial layer. Formation of interfacial layer was suppressed by chemically grown thin oxide blocking the direct Si-Hf bonding. We also demonstrate reduced interfacial layer after modified Shiraki surface etch, compared to the Radio Corporation of America clean. This indicates that a more complete hydrogen termination and atomically smoother surface can delay the onset of interfacial layer formation

Differential carrier lifetime in oxide-confined vertical cavity lasers obtained from electrical impedance measurements

Includes bibliographical references (page 901).Differential carrier lifetime measurements were performed on index-guided oxide-confined vertical cavity surface emitting lasers operating at 980 nm. Lifetimes were extracted from laser impedance measurements at subthreshold currents, with device size as a parameter, using a simple small-signal model. The carrier lifetimes ranged from 21 ns at 9 µA, to about 1 ns at a bias close to threshold. For a 6 × 6 µm2 oxide aperture device the threshold carrier density was nth ~ 2 × 1018cm-3. The effect of carrier diffusion was also considered. An ambipolar diffusion coefficient of D ~ 11 cm2s-1 was obtained.Work at Texas Tech is supported by BMDO (monitored by Lou Lome), DARPA, and the J. F. Maddox Foundation

Monte Carlo Simulation of the Rapid Crystallization of Bismuth-Doped Silicon

In this Letter we report Ising model simulations of the growth of alloys which predict quite different behavior near and far from equilibrium. Our simulations reproduce the phenomenon which has been termed 'solute trapping,' where concentrations of solute, which are far in excess of the equilibrium concentrations, are observed in the crystal after rapid crystallization. This phenomenon plays an important role in many processes which involve first order phase changes which take place under conditions far from equilibrium. The underlying physical basis for it has not been understood, but these Monte Carlo simulations provide a powerful means for investigating it

Flux networks in metabolic graphs

A metabolic model can be represented as bipartite graph comprising linked reaction and metabolite nodes. Here it is shown how a network of conserved fluxes can be assigned to the edges of such a graph by combining the reaction fluxes with a conserved metabolite property such as molecular weight. A similar flux network can be constructed by combining the primal and dual solutions to the linear programming problem that typically arises in constraint-based modelling. Such constructions may help with the visualisation of flux distributions in complex metabolic networks. The analysis also explains the strong correlation observed between metabolite shadow prices (the dual linear programming variables) and conserved metabolite properties. The methods were applied to recent metabolic models for Escherichia coli, Saccharomyces cerevisiae, and Methanosarcina barkeri. Detailed results are reported for E. coli; similar results were found for the other organisms.Comment: 9 pages, 4 figures, RevTeX 4.0, supplementary data available (excel