Process for preparing polyimide adhesives

High bonding strengths are obtained for metals and fiber-reinforced organic resin composites with no significant loss in thermo-oxidative stability of the adhesive resin

Assessment of Catalytic Function of Gold Nanorod-Bound TEMPO under NIR Irradiation

Gold nanoparticles are of interest to a number of fields due to their size-dependent optical properties, high stability, and large surface area. The combination of these properties allows for a variety of uses including photothermal therapy, drug delivery and catalysis. Gold nanorods (GNR) absorb light of a given wavelength which stimulates the oscillation of electrons on the surface and is known as the surface plasmon resonance effect. The localized heating of rods via irradiation may cause enhanced effectiveness of an attached organic catalyst which allows the oxidation of alcohols to occur at room temperature. Previously, similar catalytic systems required high temperatures that reduced the lifetime of the catalyst

Educator Stress in Terms of Selected Variables.

The purpose of this study was to determine if differences in the extent of educator stress were a function of the interaction between grade level taught, years experience, and level of job satisfaction. Data analysis was intended to reveal if differences in global stress scores of groups of educators assigned on the basis of selected variables were attributed to grade level taught, years of experience, and job satisfaction as a career choice. Educator responses were solicited concerning their attitudes toward stressful work related events thought to be associated with teaching. Educator responses were also obtained concerning grade level taught, years of experience in education, and whether or not they were satisfied with their careers in education. The subjects for this study consisted of graduate students enrolled in the Graduate Division of Education at Louisiana State University and extension classes off-campus. Each subject was assigned to one of eight groups on the basis of how each responded to a series of questions. One hundrend thirty-six subjects were then randomly selected from each of the eight groups to participate in the study. Each group included seventeen members. The Sources of Stress (SOS) Inventory was prepared after a review of the literature to determine stressful work related events which could be used to produce a global stress score. Permission of professors teaching graduate classes was obtained and educators were surveyed in thirty-one classes. Educator responses were categorized into eight groups: (1)Elementary educators with seven years or less experience who were satisfied with their careers in education, (2)elementary educators with more than seven years experience who were satisfied with their careers in education, (3)secondary educators with seven years or less experience who were satisfied with their careers in education, (4)secondary educators with more than seven years experience who were satisfied with their careers in education, (5)elementary educators with seven years or less experience who were dissatisfied with their careers in education, (6)elementary educators with more than seven years experience who were dissatisfied with their careers in education, (7)secondary educators with seven years or less experience who were dissatisfied with their careers in education, and (8)secondary educators with more than seven years experience who were dissatisfied with their careers in education. A 2 x 2 x 2 factorial design was used. The data were analyzed by the analysis of variance method. The independent variables were grade level taught, years of experience in education, and level of job satisfaction as a career choice. There were two levels of each variable. The dependent variable was the global stress score on the SOS Inventory. Based upon the results obtained, it was concluded that: (1)There was no significant difference between groups of educators in extent of stress by grade level. The null hypothesis was accepted. (2)There was no significant difference between groups of educators in extent of stress by years of experience. The null hypothesis was accepted. (3)There was a significant difference between groups of educators in extent of stress by job satisfaction. The null hypothesis was rejected. This result indicated that level of job satisfaction in education produced a significant difference in stress scores of educators (F = 17.94, p \u3c .05). (4)There was no significant interaction between grade level and years experience. The null hypothesis was accepted. (5)There was no significant interaction between grade level and job satisfaction. The null hypothesis was accepted. (6)There was no significant interaction between years of experience and job satisfaction. The null hypothesis was accepted. (7)There was no significant interaction among grade level, years of experience, and job satisfaction. This hypothesis was accepted

Volume I: The Technique and Results of Reimplementation of the Ureter. Volume II: Ureteral Reflux: With Special Reference to Vesico-Ureteral Reflux and With a Note on Colo-Ureteral Reflux

Abstract Not Provided

Being occupied in the everyday

This chapter draws on the stories told by elder New Zealanders as a way of illuminating the deeply contextual, habitual, relational and precarious nature of engaging in everyday occupations. In the telling we hear how routines matter because they give shape and structure to a day. Having a purpose, however, calls one into engaged activity with enthusiasm. Everyday occupations offer connectedness in time and with others. They can give a sense of continuity which stretches back into the distant past and which projects forward into the future. Memories and deeply held social customs matter. As such, those important to one‟s life who have died still stay as part of the livings‟ relational context. Paradoxically, we also hear how the ordinariness of familiar occupations is the context for the unfamiliar to be made visible. Precariousness is ever-present. These and other complexities of being in the everyday in advanced age, such as aloneness, and intergenerational relationships are analyzed vis-à-vis occupation using both a phenomenological and a transactional perspective. It is only by understanding the holistic, contextual nature of engaging in everyday occupations that one comes to recognize that when working with older people one must sensitively listen and think before acting. A transactional perspective provides the conceptual tools to support this practice

Solvent resistant copolyimide

A solvent resistant copolyimide was prepared by reacting 4,4'-oxydiphthalic anhydride with a diaimine blend comprising, based on the total amount of the diamine blend, about 75 to 90 mole percent of 3,4'-oxydianiline and about 10 to 25 mole percent p-phenylene diamine. The solvent resistant copolyimide had a higher glass transition temperature when cured at 350.degree. , 371.degree. and 400.degree. C. than LaRC.TM.-IA. The composite prepared from the copolyimide had similar mechanical properties to LaRC.TM.-IA. Films prepared from the copolyimide were resistant to immediate breakage when exposed to solvents such as dimethylacetamide and chloroform. The adhesive properties of the copolyimide were maintained even after testing at 23.degree., 150.degree., 177.degree. and 204.degree. C

Copolyimides prepared from ODPA, BTDA and 3,4'-ODA

A copolyimide was prepared by reacting 3,4'-oxydianiline (3,4'-ODA) with a dianhydride blend comprising, based on the total amount of the dianhydride blend, about 67 to 80 mole percent of 4,4'-oxydiphthalic anhydride (ODPA) and about 20 to 33 mole percent of 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA). The copolyimide may be endcapped with up to about 10 mole percent of a monofunctional aromatic anhydride and has unbalanced stoichiometry such that a molar deficit in the dianhydride blend is compensated with twice the molar amount of the monofunctional aromatic anhydride. The copolyimide was used to prepare composites, films and adhesives. The film and adhesive properties were significantly better than those of LaRC.TM.-IA

Integration of irradiation with cytoplasmic incompatibility to facilitate a lymphatic filariasis vector elimination approach

<p>Abstract</p> <p>Background</p> <p>Mass drug administration (MDA) is the emphasis of an ongoing global lymphatic filariasis (LF) elimination program by the World Health Organization, in which the entire 'at risk' human population is treated annually with anti-filarial drugs. However, there is evidence that the MDA strategy may not be equally appropriate in all areas of LF transmission, leading to calls for the augmentation of MDA with anti-vector interventions. One potential augmentative intervention is the elimination of vectors via repeated inundative releases of male mosquitoes made cytoplasmically incompatible via an infection with <it>Wolbachia </it>bacteria. However, with a reduction in the vector population size, there is the risk that an accidental female release would permit the establishment of the incompatible <it>Wolbachia </it>infection type, resulting in population replacement instead of population elimination. To avoid the release of fertile females, we propose the exposure of release individuals to low doses of radiation to sterilize any accidentally released females, reducing the risk of population replacement.</p> <p>Results</p> <p><it>Aedes polynesiensis </it>pupae of differing ages were irradiated to determine a radiation dose that results in sterility but that does not affect the survival and competitiveness of males. Laboratory assays demonstrate that males irradiated at a female sterilizing dosage of 40 Gy are equally competitive with un-irradiated males. No effect of irradiation on the ability of <it>Wolbachia </it>to affect egg hatch was observed.</p> <p>Conclusion</p> <p>An irradiation dose of 40 Gy is sufficient to cause female sterility, but has no observed negative effect on male fitness. The results support further development of this approach as a preventative measure against accidental population replacement.</p