A SURVEY OF LARGE SPACE CHAMBERS

Survey of large space chambers - vacuum chambers to simulate space environmen

Transport of Mars atmospheric water into high northern latitudes during a polar warming

Several numerical experiments were conducted with a simplified tracer transport model in order to attempt to examine the poleward transport of Mars atmospheric water during a polar warming like that which occurred during the winter solstice dust storm of 1977. The flow for the transport experiments was taken from numerical simulations with a nonlinear beta-plane dynamical model. Previous studies with this model have demonstrated that a polar warming having essential characteristics like those observed during the 1977 dust storm can be produced by a planetary wave mechanism analogous to that responsible for terrestrial sudden stratospheric warmings. Several numerical experiments intended to simulate water transport in the absence of any condensation were carried out. These experiments indicate that the flow during a polar warming can transport very substantial amounts of water to high northern latitudes, given that the water does not condense and fall out before reaching the polar region

Numerical simulations of dust transport into northern high latitudes during a Martian polar warming

The formation and evolution of the polar laminated terrain depends on rates of dust transport to the polar caps. A simplified dynamical model is shown similar to models used to simulate terrestrial stratospheric polar warmings could simulate certain observed features of the circulation during Martian global dust storms. Model simulations of dust transport showed that substantial quantities of dust, enough to produce optical depths of approx. 1, could reach the pole during these storms

Communication responses to positive or neutral facial expressions between the genders

The purpose of this thesis was to determine whether or not college students would respond with any communication to a stimulus of nonverbal communication of either eye contact alone or paired with smiling to the same or opposite gender. The characteristics of this study may have implications on how successful nonverbal communication can be. One-hundred-sixty students, 8 groups within, were randomly stimulated by either a female or male with either a positive or neutral facial expression and their natural responses were recorded. The responses were coded on a Likert scale and analyzed with a 3 way ANOVA. The data presented in this study allows this researcher to reject the second null hypothesis and accept the alternate hypothesis that a particular gender providing the nonverbal communication stimuli will gain more responses from the participants. A significant difference was found among the female providing nonverbal communication stimuli

Molecular characterization of mesophilic and thermophilic sulfate reducing microbial communities in expanded granular sludge bed (EGSB) reactors

The microbial communities established in mesophilic and thermophilic expanded granular sludge bed reactors operated with sulfate as the electron acceptor were analyzed using 16S rRNA targeted molecular methods, including denaturing gradient gel electrophoresis, cloning, and phylogenetic analysis. Bacterial and archaeal communities were examined over 450 days of operation treating ethanol (thermophilic reactor) or ethanol and later a simulated semiconductor manufacturing wastewater containing citrate, isopropanol, and polyethylene glycol 300 (mesophilic reactor), with and without the addition of copper(II). Analysis, of PCR-amplified 16S rRNA gene fragments using denaturing gradient gel electrophoresis revealed a defined shift in microbial diversity in both reactors following a change in substrate composition (mesophilic reactor) and in temperature of operation from 30 degrees C to 55 degrees C (thermophilic reactor). The addition of copper(II) to the influent of both reactors did not noticeably affect the composition of the bacterial or archaeal communities, which is in agreement with the very low soluble copper concentrations (3-310 microg l(-1)) present in the reactor contents as a consequence of extensive precipitation of copper with biogenic sulfides. Furthermore, clone library analysis confirmed the phylogenetic diversity of sulfate-reducing consortia in mesophilic and thermophilic sulfidogenic reactors operated with simple substrate

Letter to Cammie Williams

Letter to Cammie Williams from his cousin, Willie R. Hollingsworth, in Chicago, Illinois, regarding politics and his support of Grover Cleveland over the Republican (Benjamin Harrison) and Populist (James Weaver) party candidates.https://scholarsjunction.msstate.edu/mss-williams-papers/1078/thumbnail.jp

Letter to Cammie Williams

Letter to Cammie Williams from his cousin, Willie R. Hollingsworth, in Chicago, Illinois, regarding courtship and politics - particularly his support of the Democratic party and Grover Cleveland.https://scholarsjunction.msstate.edu/mss-williams-papers/1091/thumbnail.jp

Letter to Cammie Williams

Letter to Cammie Williams from his cousin, Willie R. Hollingsworth, in Fairfield, Texas, 1878.https://scholarsjunction.msstate.edu/mss-williams-papers/1101/thumbnail.jp

Letter to Cammie Williams

Letter to Cammie Williams from his cousin, W. R. Hollingsworth, in Clinton, Mississippi, regarding farming, keeping books, and courtship.https://scholarsjunction.msstate.edu/mss-williams-papers/1081/thumbnail.jp

The coverage and frequency of mass drug administration required to eliminate persistent transmission of soil-transmitted helminths

A combination of methods, including mathematical model construction, demographic plus epidemiological data analysis and parameter estimation, are used to examine whether mass drug administration (MDA) alone can eliminate the transmission of soil-transmitted helminths (STHs). Numerical analyses suggest that in all but low transmission settings (as defined by the magnitude of the basic reproductive number, R0), the treatment of pre-school-aged children (pre-SAC) and school-aged children (SAC) is unlikely to drive transmission to a level where the parasites cannot persist. High levels of coverage (defined as the fraction of an age group effectively treated) are required in pre-SAC, SAC and adults, if MDA is to drive the parasite below the breakpoint under which transmission is eliminated. Long-term solutions to controlling helminth infections lie in concomitantly improving the quality of the water supply, sanitation and hygiene (WASH). MDA, however, is a very cost-effective tool in long-term control given that most drugs are donated free by the pharmaceutical industry for poor regions of the world. WASH interventions, by lowering the basic reproductive number, can facilitate the ability of MDA to interrupt transmission