Thermal and ablative lag induced by a periodic heat input.

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76422/1/AIAA-1967-336-421.pd

GENERALIZED CYTOMEGALIC INCLUSION DISEASE

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“I Knew These Marvelous People”: Gay Men’s Experiences of Long-Term HIV/AIDS Survival

The gay and bisexual men who were diagnosed with HIV/AIDS before the pharmaceutical breakthroughs of the mid-1990s were given what was expected to be a death sentence. Instead, the majority of those who began the newly available treatments outlived not just their initial prognoses but their lovers, friends, and community members who had already perished. This study used grounded theory analysis of semi-structured interviews with a sample of 10 self-identified gay men who are long-term HIV/AIDS survivors to explore experiences of trauma, loss, and mourning in relation to current psychological wellbeing. Qualitative thematic analysis indicated that despite demographic variance among this group of men, they reported common formative traumas related to both minority stress and grief, as well as common joys. Participants described a robust range of experiences with regards to whether and how they mourned their losses as well as the ways they relate to the past, revealing a broad spectrum of underlying emotional defenses. Those who exhibited the broadest range of defensive styles and orientations toward the past exhibited the greatest psychological wellbeing in terms of flexibility and emotion tolerance. Their experiences shed light on psychological processes that are both universal to the human experience and specific to this population

Effect of the boundary layer upon the flow in a conical hypersonic nozzle

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76641/1/AIAA-2269-288.pd

Explaining a Productive Decade

This paper analyzes the sources of recent U.S. productivity growth using both aggregate and industry-level data. The paper confirms the central role of information technology in the productivity revival during 1995-2000 and shows that it played a significant, although smaller, role after 2000. Productivity growth after 2000 appears to have been boosted by industry restructuring and cost cutting in response to profit pressures, an unlikely source of future strength. In addition, the incorporation of intangible capital into the growth accounting framework somewhat diminishes estimates of labor productivity's performance since 2000 and makes the gain during 1995-2000 look larger than in the official data. Finally, the paper examines the outlook for trend growth in labor productivity; the resulting estimate, which is subject to much uncertainty, is centered at 2 1/4 percent a year, faster than the lackluster pace that prevailed before 1995 but somewhat slower than the 1995-2000 average.macroeconomics, productivity growth, labor productivity

The ground impulse generated by a plane fuel-air explosion with side relief

Detonations can be initiated in unconfined fuel-oxidizer clouds by blast waves of sufficient energy. The ground impulse generated by such detonations can cause considerable damage. An analytical theory is developed in the present paper, which makes it possible to predict this impulse, and experimental measurements which verify the theory are reported.A plane detonation wave propagating through a one-dimensional fuel-air cloud in contact with the ground and with the inert atmosphere at height h is considered. The wave is followed by an expansion wave which propagates from the inert gases into the combustion products, and an oblique shock is induced in the inert bounding the explosive. In computing the impulse only the region behind the detonation where the expansion is reflected from the ground is considered. The impulse per unit area is found to be the product of p2(h/C) and a universal impulse function Us([xi]), where p2 is the pressure behind the detonation and C is the Chapman-Jouguet velocity, and [xi] = x/l is the dimensionless distance from the detonation.Experimental values of the pressure and impulse behind a plane wave were obtained using a plastic bag, 4 x 4 x 20 ft long, filled with a stoichiometric MAPP-air mixture. The detonation was initiated using an explosive initiator at one end of the bag. Pressure transducers placed on the ground plane along the center of the bags were used to determine the variation of the pressure and impulse per unit area with time. Theory and experiment were found to be in excellent agreement.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/23617/1/0000580.pd

Detonability of RDX dust in air/oxygen mixtures

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77369/1/AIAA-9528-470.pd

Mineral carbonation of peridotite fueled by magmatic degassing and melt impregnation in an oceanic transform fault

Most of the geologic CO2 entering Earth's atmosphere and oceans is emitted along plate margins. While C-cycling at mid-ocean ridges and subduction zones has been studied for decades, little attention has been paid to degassing of magmatic CO2 and mineral carbonation of mantle rocks in oceanic transform faults. We studied the formation of soapstone (magnesite-talc rock) and other magnesite-bearing assemblages during mineral carbonation of mantle peridotite in the St. Paul's transform fault, equatorial Atlantic. Clumped carbonate thermometry of soapstone yields a formation (or equilibration) temperature of 147 ± 13 °C which, based on thermodynamic constraints, suggests that CO2(aq) concentrations of the hydrothermal fluid were at least an order of magnitude higher than in seawater. The association of magnesite with apatite in veins, magnesite with a δ13C of -3.40 ± 0.04‰, and the enrichment of CO2 in hydrothermal fluids point to magmatic degassing and melt-impregnation as the main source of CO2. Melt-rock interaction related to gas-rich alkali olivine basalt volcanism near the St. Paul's Rocks archipelago is manifested in systematic changes in peridotite compositions, notably a strong enrichment in incompatible elements with decreasing MgO/SiO2. These findings reveal a previously undocumented aspect of the geologic carbon cycle in one of the largest oceanic transform faults: Fueled by magmatism in or below the root zone of the transform fault and subsequent degassing, the fault constitutes a conduit for CO2-rich hydrothermal fluids, while carbonation of peridotite represents a vast sink for the emitted CO2