High Temperature Chemical Degradation of PMR-15 Polymer Resins

PMR-15 is a polymer resin for glass and carbon reinforced composites used for high temperature, civilian and military aerospace applications. The harsh environments of PMR-15 applications lead to long term structural degradation and, in turn, impact the readiness capabilities of the system. This study investigated the thermal and oxidative degradation of PMR-15 neat resin powder through the use of thermal gravimetric analysis (TGA) in oxygen, argon and air at isothermal hold temperatures of 260, 288, 316, and 343 °C for 250 hours. The TGA measured the degradation by recording the change in neat resin powder mass versus time. The qualitative results were similar for all tests. The specimens initially lost weight at a rapid rate followed by a reduction in the weight loss rate to a near constant value that was dependent upon the isothermal temperature and the gaseous environment. The data from these tests will be used by researchers in the Air Force Research Laboratory Materials and Manufacturing Directorate to further efforts made towards developing a constitutive law and the associated models to predict the behavior of polymer matrix reinforced composites

Discovery of orbital decay in SMC X-1

The results are reported of three observations of the binary X ray pulsar SMC X-1 with the Ginga satellite. Timing analyses of the 0.71 s X ray pulsations yield Doppler delay curves which, in turn, provide the most accurate determination of the SMC X-1 orbital parameters available to date. The orbital phase of the 3.9 day orbit is determined in May 1987, Aug. 1988, and Aug. 1988 with accuracies of 11, 1, and 3.5 s, respectively. These phases are combined with two previous determinations of the orbital phase to yield the rate of change in the orbital period: P sub orb/P sub orb = (-3.34 + or - 0.023) x 10(exp -6)/yr. An interpretation of this measurement and the known decay rate for the orbit of Cen X-3 is made in the context of tidal evolution. Finally, a discussion is presented of the relation among the stellar evolution, orbital decay, and neutron star spinup time scales for the SMC X-1 system

A cognitive‐behavioural perspective on Personality disorders with over‐regulation of emotions and poor self‐reflectivity: The case of a man with avoidant and not‐otherwise specified personality disorder, social phobia and dysthymia treated with Metacognitive Interpersonal Therapy

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/92051/1/pmh1195.pd

UA35/8 The Topper

Newsletter published by WKU Veterans Upward Bound includes articles and calendar of events

Racial Justice at Home: The Case for Opportunity-Housing Vouchers

On July 14, 2009, Secretary of Housing and Urban Development Shaun Donovan delivered a speech in which he laid out for the first time the Obama Administration\u27s vision for neighborhood transformation for the 21st century. The centerpiece of Secretary Donovan\u27s remarks, and of the new Administration\u27s approach to urban poverty, is the Choice Neighborhoods initiative, a $250 million grant program to stimulate the revitalization of poor, inner-city areas. Under Choice Neighborhoods, the Department of Housing and Urban Development (HUD) will extend grants to public, private, and nonprofit organizations to provide public housing and other community services (e.g., after-school programs, childcare, and job counseling) to residents of urban communities. The philosophy behind Choice Neighborhoods, in the words of Secretary Donovan, is that not only is housing in ghetto areas substandard, the communities themselves [are] substandard

Firm-On-Firm Review Directory, April 1989

https://egrove.olemiss.edu/aicpa_assoc/1600/thumbnail.jp

Moonchildren with CATCO

The play chronicles a year in the life of the moonchildren referred to in the title: eight college students living communally together in an off-campus attic in the mid-1960s.https://digitalcommons.otterbein.edu/production_1997-1998/1005/thumbnail.jp