Three model space experiments on chemical reactions

Three investigations conducted aboard Skylab IV and Apollo-Soyuz involved phenomena that are of interest to the biochemistry community. The formaldehyde clock reaction and the equilibrium shift reaction experiments conducted aboard Apollo Soyuz demonstrate the effect of low-g foams or air/liquid dispersions on reaction rate and chemical equilibrium. The electrodeposition reaction experiment conducted aboard Skylab IV demonstrate the effect of a low-g environment on an electrochemical displacement reaction. The implications of the three space experiments for various applications are considered

Student Success and the Impact of Social Media: Integrating and Regulating Boundaries

In this thesis, I will be examining the impact social media has on student success. I do not define success as only academic success. I believe success is a combination of mental and physical well-being, academic success, and the opportunities available to students during their time at the institution as well as after. The guiding question for my research is: how is social media negating students to reach their full potential? I will use the works of John Dewy, Paulo Friere, Arthur Chickering and others in hopes to address this question of concern. My overarching thesis is social media is negatively impacting student development and future success. To combat this concern, I have created a program that addresses how social media negates student success. The PAUSE program is a four-session workshop offered to first year and transfer students. The PAUSE program challenges students to pause before they post and ask themselves: is the post positive, authentic, unique, supportive or empathetic. The success of this program will be determined by the dedication of the advisor and mentors. The sessions will tackle stress, procrastination, and carelessness. Each of these adjectives negates the three aspects of success that I am trying to improve. Lastly, I will discuss what limitations and improvements could be made in the future to improve my intervention

Concepts for microgravity experiments utilizing gloveboxes

The need for glovebox facilities on spacecraft in which microgravity materials processing experiments are performed is discussed. At present such facilities are being designed, and some of their capabilities are briefly described. A list of experiment concepts which would require or benefit from such facilities is presented

The effect of residence type on adjustment to college

This study examined the difference in adjustment to college between Commuters (students who lived at home with their parents) and Boarders (students who lived on campus in residence halls). The study was conducted at a rural teachers college in West Virginia. The Student Adaptation to College Questionnaire (SACQ) was administered to 86 students from four English 102 classes. The results include 48 students who met the requirements of the study. The results of the SACQ were input into a SPSS computer program to produce a 2x2 design ANOVA. The Test of Between-Subject Effects showed three areas of significant difference between the Commuters and the Boarders. In this study. Gender had a significant effect on Academic Adjustment and Social Adjustment. Living Situation was found to have a significant effect on Attachment. The study did not indicate an interaction effect between Living Situation and Gender

Evaluation of AAFE apparatus to measure residual and transient convection in zero-gravity

An evaluation apparatus which photographs convective and diffusive flows in crystal growth experiments is presented. Results in the following catagories are reported: (1) Human factors; (2) Electrical and mechanical; (3) Optical performance; and (4) Thermal performance

Electrochemical deposition of silver crystals aboard Skylab 4

Silver crystals were grown aboard Skylab 4 by an electro-chemical reaction and subsequently returned to earth for comparison with crystals grown at 1- and 5-g. Both the Skylab and earth-grown crystals show a variety of structures. Certain tendencies in structure dependency on gravity level, however, can be discerned. In addition, downward growing dendrite streamers; upward growing chunky crystal streamers; growth along an air/liquid interface; and ribbon, film, and fiber crystal habits were observed in experiments conducted on the ground with solutions of varying concentrations. It was also observed that the crystal structures of space and ground electro-deposited silver crystals were very similar to the structures of germanium selenide and germanium telluride crystals grown in space and on the ground by a vapor transport technique. Consideration of the data leads to the conclusions that: (1) the rate of electrochemical displacement of silver ions from a 5 percent aqueous solution by copper is predominantly diffussion controlled in space and kinetically controlled in 1- and higher-g because of augmentation of mass transport by convection; (2) downward and upward crystal streamers are the result of gravity-driven convection, the flow patterns of which can be delineated. Lateral growths along an air/liquid interface are the result of surface-tension-driven convection, the pattern of which also can be delineated; (3) electrolysis in space or low-g environments can produce either dendritic crystals with more perfect microcrystalline structures or massive, single crystals with fewer defects than those grown on ground or at higher g-levels. Ribbons or films of space-grown silicon crystals would find a ready market for electronic substrate and photocell applications. Space-grown dendritic, metal crystals present the possibility of unique catalysts. Large perfect crystals of various materials are desired for a number of electronic and optical applications; and (4) vapor transport growth of germanium selenide and germanium telluride is affected by convection mechanisms similar to the mechanisms hypothesized for the electrochemical deposition of silver crystals. Evidence and considerations leading to the preceding summaries and conclusions are presented. The implications of the findings and conclusions for technological applications are discussed, and recommendations for further experiments are presented

Liquid encapsulated float zone process and apparatus

The process and apparatus for growing crystals using float zone techniques are described. A rod of crystalline materials is disposed in a cylindrical container, leaving a space between the rod and container walls. This space is filled with an encapsulant, selected to have a slightly lower melting point than the crystalline material. The rod is secured to a container end cap at one end and to a shaft at its other end. A piston slides over the rod and provides pressure to prevent loss of volatile components upon melting of the rod. Prior to melting the rod the container is first heated to melt the encapsulant, with any off-gas from this step being vented to a cavity behind the piston. The piston moves slightly forward owing to volume change upon melting of the encapsulant, and the vent passageway is closed. The container is then moved longitudinally through a heated zone to progressively melt sections of the rod as in conventional float zone processes. The float zone technique may be used in the microgravity environment of space

An Examination of PTSD in Ethnoracial Minorities

Ethnic and racial minorities make up a substantial portion of the population in the United States; however, relatively little is known about the prevalence of posttraumatic stress disorder (PTSD) in these populations. Research has consistently shown that the majority of individuals in the United States have experienced at least one traumatic event in their lifetime. Not all who are exposed to trauma go on to develop PTSD, but ethnoracial minorities have been found to have higher rates than their European American counterparts. This poster will review the current literature in this area and discuss implications for social justice

Impact of Agricultural Chemicals on Wetland Habitats and Associated Biota with Special Reference to Migratory Birds: A Selected and Annotated Bibliography

This bibliography documents the impact of pesticides and other agricultural chemicals on northern prairie wetlands and the migratory birds using the wetlands. It also recommends various practices or techniques which could mitigate, ameliorate, or prevent such impacts. Such a subject covers a variety of topics. Included are papers from basic laboratory research to determine the acute, and sometimes chronic, toxicity of a variety of chemical pesticides. Also included are papers covering alternative pest control and agricultural methods and various bioassay techniques

The Impact of Phorate on the Genetic Diversity of Wetland Aquatic Invertebraes

Impacts of the insecticide phorate on the genetic diversity of wetland invertebrates were investigated using field and laboratory studies in 1991. Electrophoretic methods were evaluated for revealing the impact of insecticides. Objectives were to determine the ability of electrophoresis to reveal the impact of phorate on invertebrates and to determine the influence of phorate on the genetic diversity in two common invertebrates. Amphipods, Hyallela azteca and mayflies, Callibaetis ferrugineus (Walsh) were placed in constructed mesocosms in wetlands and were exposed to varying amounts of phorate. Survivors and individuals from the parent population were genetically tested using cellulose acetate electrophoresis techniques. Allele frequencies were calculated for invertebrates in treatments and invertebrates from populations not exposed to phorate. Mortality of test invertebrates was significantly greater in phorate treatments than in controls (F = 5.97, P = 0.019). Chi-square analysis revealed differences in allele frequencies between the untreated populations and individuals of both species treated with phorate cx2 \u3e 8.5; df = 1,2; p \u3c 0.05). In addition, phorate appeared to eliminate, or reduce the frequency of certain genotypes in both species. Results indicate phorate selected against sensitive individuals and electrophoresis was effective at detecting differences between untreated populations and invertebrates that survived treatments. Genetic techniques should enable wetland scientists to detect the effects of pollution on invertebrate populations by monitoring genetic composition