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201 results on '"Dillingham R"'

5. ‘MOCT’: MHEALTH INTERVENTION TO IMPROVE ENGAGEMENT IN CARE AMONG PEOPLE WITH DRUG-RESISTANT TUBERCULOSIS, HIV, AND SUBSTANCE USE IN IRKUTSK, SIBERIA

Author

Ogarkov, O., primary, Hodges, J., additional, Zhdanova, S., additional, Koshkina, O., additional, Suzdalnitsky, A., additional, Moiseeva, E., additional, Waldman, A.L., additional, Koshcheev, M., additional, Schwendinger, J., additional, Vitko, S., additional, Dillingham, R., additional, and Heysell, S., additional

Published
2020
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13. R. Giles Dillingham.

Author

Dillingham, R. Giles

Subjects
MECHANICAL abrasion, COMPOSITE materials, MICROSTRUCTURE, COMPRESSIVE strength, CARBON fibers
Abstract

Surface preparation for aerospace bonding and coating operations are still largely manual processes which frequently include some combination of solvent wiping and abrasion. These processes can be very effective if implemented with proper process control feedbacks. However, recent experience with bonding and coating operations across a range of industries has revealed that processes that were successfully demonstrated in a materials and process laboratory don't always translate into reliable and repeatable processes in manufacturing. Root cause analysis has shown that this usually stems directly from a lack of knowledge of all of the variables that can affect the success of a surface preparation process. Process variables that are not identified cannot be measured and controlled. This paper presents a compendium of variables that have been uncovered during failure analysis of aerospace bonding operations, and shows how awareness of these variables permits implementation of simple process control steps that significantly increase bond reliability. [ABSTRACT FROM AUTHOR]

Published
2019

16. Impact of medical plurality on care engagement and treatment outcomes among people living with HIV in Limpopo, South Africa

Author

Boyd, T., primary, Wright, M., additional, Badejo, O., additional, Dillingham, R., additional, Santee Ann, C., additional, Mondlane, N., additional, Makhado, C., additional, Meskina, M., additional, Nevhutalu, P., additional, Bulled, N., additional, Masebe, T., additional, Mavhandu, L., additional, and Bessong, P., additional

Published
2016
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18. High anti-cryptosporidium parvum igg seroprevalence in hiv-infected adults in limpopo, south africa

Author

Bartelt, L.A., Samie, A., Guerrant, R.L., Warren, C.A., Sevilleja, J.E., Bessong, P.O., Barrett, L.J., and Dillingham, R.

Subjects
parasitic diseases
Abstract

A seroepidemiological study was performed to determine the seroprevalence of Cryptosporidium in human immunodeficiency virus (HIV)-infected adults and local university students in the Limpopo Province, South Africa. Using a custom anti-C. parvum immunoglobulin G (IgG) enzyme-linked immunosorbent assay (ELISA), the seroprevalence of Cryptosporidium was found to be significantly higher (75.3%; 146 of 193) in HIV-infected individuals compared with student volunteers (32.8%; 19 of 58) (P < 0.001). A more recent diagnosis of HIV was associated with anti-C. parvum IgG seropositivity, as was lower weight among HIV-infected women. This is the first seroepidemiologic study of Cryptosporidium in rural South Africa, and it shows high endemicity among the HIV-infected population. In addition to raising the possibility of significant Cryptosporidium-related morbidities, this finding reveals that in Limpopo and perhaps in other low-income, rural populations, interrupting waterborne pathogen transmission will require strategies effective against environmentally hardy parasites such as Cryptosporidium.

Published
2013
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24. Effect of Surface Engineering Processes on the Surface Properties and Adhesive Bonding of Graphite/Epoxy Composites (Preprint)

Author

CINCINNATI UNIV OH, Boerio, F. J., Roby, B., Dillingham, R. G., Bossi, R. H., CINCINNATI UNIV OH, Boerio, F. J., Roby, B., Dillingham, R. G., and Bossi, R. H.

Abstract

The effect of surface engineering processes such as grit-blasting and plasma etching on the surface energy and composition of graphite/epoxy composites that were cured at 177 C was determined. As-tooled composites had about 73% carbon, 20% oxygen, and 5% nitrogen on the surface. Grit-blasting with 80- or 220-grit garnet resulted in an increase of several percent in the carbon concentration and a similar decrease in the oxygen concentration. However, grit-blasting with 220-grit alumina resulted in a decrease in the carbon concentration of a few percent and a similar increase in oxygen concentration. Etching as-tooled composites in O2 plasmas resulted in a decrease in the carbon concentration and an increase in the oxygen concentration of about 10%. Derivatization of the composite surfaces with trifluoroacetic anhydride and pentafluorobenzalde-hyde enabled the relative numbers of hydroxyl and amino groups on the surfaces to be determined and showed that the surface properties of the composites were dominated by the hydroxyl groups. As-tooled composites had a total surface energy of approximately 35 mJ/sq m; the polar components were small, meaning that the surface energies were mostly dispersive. After grit-blasting with 80- or 220-grit garnet or 220-grit alumina, the polar component of the surface energy increased significantly and the total surface energy was approximately 50 mJ/sq m., To be published in the Proceedings of the Society for the Advancement of Materials Processing and Engineering (SAMPE).

Published
2007

35. Diarrhea and Reduced Levels of Antiretroviral Drugs: Improvement with Glutamine or Alanyl-Glutamine in a Randomized Controlled Trial in Northeast Brazil

Author

Bushen, O. Y., primary, Davenport, J. A., additional, Lima, A. B., additional, Piscitelli, S. C., additional, Uzgiris, A. J., additional, Silva, T. M. J., additional, Leite, R., additional, Kosek, M., additional, Dillingham, R. A., additional, Girao, A., additional, Lima, A. A. M., additional, and Guerrant, R. L., additional

Published
2004
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41. Surface treatment and adhesive bonding techniques for repair of high-temperature composite materials.

Author

Dillingham, R Giles, Oakley, Brietta R, Dan-Jumbo, Eugene, Baldwin, Joel, Keller, R, and Magato, James

Subjects
*COMPOSITE materials, *POLYIMIDES, *EFFECT of temperature on adhesives, *SURFACE preparation, *AIRPLANE materials, *CANTILEVERS, *MAINTENANCE
Abstract

Adhesive bonding of structural aircraft materials depends upon a thorough understanding of factors that affect bond strength and durability. It is well known that surface preparation is critical to adhesive bond performance. However, little information is available regarding the effect of surface preparation procedures on adhesive bonding of high-temperature polyimide composites. Mechanical treatments such as hand sanding are commonly used for composite materials, and in general are known to improve the wettability of the surface as well as effect contaminant removal. Less is known about the influence of mechanical treatments on the surface chemistry. This article discusses the effects of mechanical surface preparation on the adhesive bond strength, durability, and failure mode of several high-temperature polyimide-based composites and adhesives. [ABSTRACT FROM PUBLISHER]

Published
2014
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48. Correspondence

Author

Dillingham, R. H., Peter, W. P., Wright, Walter C., Shannon, Chas. R., Dillingham, R. H., Peter, W. P., Wright, Walter C., and Shannon, Chas. R.

Abstract

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49. Correspondence

Author

Dillingham, R. H., Peter, W. P., Wright, Walter C., Shannon, Chas. R., Dillingham, R. H., Peter, W. P., Wright, Walter C., and Shannon, Chas. R.

Abstract

1

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