Free-flight measurements of stagnation-point convective heat transfer at velocities to 41,000 ft/sec

Free flight measurements of stagnation point convective heat transfer in air at hypersonic speed

Radiation effects on lasers Technical report, Jul. 1, 1965 - May 31, 1966

Effects of space radiation on laser

Isotopes and Horses

This presentation for the Natural Sciences Poster Session at Parkland College defines isotopes and summarizes an experiment conducted on a modern horse to examine the seasonal shifts of trace elements by measuring the oxygen and carbon isotopes in tooth enamel

KNOWLEDGE AND ACKNOWLEDGEMENT OF POSTTRAUMATIC STRESS DISORDER AND EFFECTS ON MILITARY COUPLES

This study used mixed methods to examine the impact of service-members‟ knowledge and acknowledgement of Posttraumatic Stress Disorder (PTSD) on relationship satisfaction of both the service-members and their spouses. Family stress theory was used to conceptualize the relationship between the occurrence of PTSD and relationship satisfaction. Forty individuals (i.e., 20 couples) completed questionnaires containing self-report measures of knowledge of PTSD, experience of PTSD symptoms, severity of PTSD symptoms, and relationship satisfaction. Participants also completed semi-structured interviews concerning PTSD symptoms, impact of PTSD symptoms on their relationship, and attitudes observed about PTSD. No significant links were found between knowledge, acknowledgement, and relationship satisfaction. Qualitative analysis of semi-structured interviews found that the couples‟ experiences of PTSD symptoms and the impact of PTSD on the couple relationships were consistent with the existing literature. Common attitudes regarding PTSD were reported by the couples, indicating a persistent negative attitude of PTSD

Independent Orbiter Assessment (IOA): FMEA/CIL assessment

The results of the Independent Orbiter Assessment (IOA) of the Failure Modes and Effects Analysis (FMEA) and Critical Items List (CIL) are presented. Direction was given by the Orbiter and GFE Projects Office to perform the hardware analysis and assessment using the instructions and ground rules defined in NSTS 22206. The IOA analysis features a top-down approach to determine hardware failure modes, criticality, and potential critical items. To preserve independence, the anlaysis was accomplished without reliance upon the results contained within the NASA and prime contractor FMEA/CIL documentation. The assessment process compares the independently derived failure modes and criticality assignments to the proposed NASA Post 51-L FMEA/CIL documentation. When possible, assessment issues are discussed and resolved with the NASA subsystem managers. The assessment results for each subsystem are summarized. The most important Orbiter assessment finding was the previously unknown stuck autopilot push-button criticality 1/1 failure mode, having a worst case effect of loss of crew/vehicle when a microwave landing system is not active

Multi-Gain-Stage InGaAs Avalanche Photodiode with Enhanced Gain and Reduced Excess Noise

We report the design, fabrication, and test of an InGaAs avalanche photodiode (APD) for 950-1650 nm wavelength sensing applications. The APD is grown by molecular beam epitaxy on InP substrates from lattice-matched InGaAs and InAlAs alloys. Avalanche multiplication inside the APD occurs in a series of asymmetric gain stages whose layer ordering acts to enhance the rate of electron-initiated impact ionization and to suppress the rate of hole-initiated ionization when operated at low gain. The multiplication stages are cascaded in series, interposed with carrier relaxation layers in which the electric field is low, preventing avalanche feedback between stages. These measures result in much lower excess multiplication noise and stable linear-mode operation at much higher avalanche gain than is characteristic of APDs fabricated from the same semiconductor alloys in bulk. The noise suppression mechanism is analyzed by simulations of impact ionization spatial distribution and gain statistics, and measurements on APDs implementing the design are presented. The devices employing this design are demonstrated to operate at linear-mode gain in excess of 6000 without avalanche breakdown. Excess noise characterized by an effective impact ionization rate ratio below 0.04 were measured at gains over 1000

Independent Orbiter Assessment (IOA): Analysis of the landing/deceleration subsystem

The results of the Independent Orbiter Assessment (IOA) of the Failure Modes and Effects Analysis (FMEA) and Critical Items List (CIL) are presented. The IOA approach features a top-down analysis of the hardware to determine failure modes, criticality, and potential critical items. To preserve independence, this analysis was accomplished without reliance upon the results contained within the NASA FMEA/CIL documentation. This report documents the independent analysis results corresponding to the Orbiter Landing/Deceleration Subsystem hardware. The Landing/Deceleration Subsystem is utilized to allow the Orbiter to perform a safe landing, allowing for landing-gear deploy activities, steering and braking control throughout the landing rollout to wheel-stop, and to allow for ground-handling capability during the ground-processing phase of the flight cycle. Specifically, the Landing/Deceleration hardware consists of the following components: Nose Landing Gear (NLG); Main Landing Gear (MLG); Brake and Antiskid (B and AS) Electrical Power Distribution and Controls (EPD and C); Nose Wheel Steering (NWS); and Hydraulics Actuators. Each level of hardware was evaluated and analyzed for possible failure modes and effects. Criticality was assigned based upon the severity of the effect for each failure mode. Due to the lack of redundancy in the Landing/Deceleration Subsystems there is a high number of critical items

rLOAD: does sex mediate the effect of acute antiplatelet loading on stroke outcome.

BackgroundBiologic sex can influence response to pharmacologic therapy. The purpose of this proof-of-concept study was to evaluate the medicating effects of estrogen in the efficacy of acute antiplatelet loading therapy on stroke outcome in the rabbit small clot embolic model.MethodsFemale and male (20/group) New Zealand White rabbits were embolized to produce embolic stroke by injecting small blood clots into the middle cerebral artery via an internal carotid artery catheter. Two hours after embolization, rabbits were treated with standard dose antiplatelet loading (aspirin 10 mg/kg plus clopidogrel 10 mg/kg). Primary outcome measures were platelet inhibition, behavioral outcome P 50 (the weight of microclots (mg) that produces neurologic dysfunction in 50% of a group of animals), and effect of endogenous estrogen on outcome.ResultsFor the first time in a non-rodent model of stroke, it was found that higher endogenous estrogen levels resulted in significantly better behavioral outcome in female subjects (r s -0.70, p < 0.011). Platelet inhibition in response to collagen, arachidonic acid, and adenosine diphosphate (ADP) was not significantly different in females with higher vs. lower estrogen levels.ConclusionsBehavioral outcomes are improved with females with higher endogenous estrogen levels treated with standard dose antiplatelet loading. This is the first non-rodent study to demonstrate that higher endogenous estrogen levels in female rabbits appear to be neuroprotective in ischemic stroke. This research supports the further study of the effect of endogenous estrogen levels on outcome with standard dose antiplatelet loading in stroke patients not eligible for revascularization therapies

Women living with Crohn\u27s disease.

Crohn\u27s disease (CD) is one of the conditions that is classified under inflammatory bowel disease. Crohn\u27s disease is a chronic condition that is increasing in incidence in women. Four women were interviewed on three or four occasions over a two year period. All interviews were transcribed verbatim. The purpose of this grounded theory study was to provide an understanding of the experience of women living with Crohn\u27s disease (CD). This study also verified, through the emergent fit mode, that Hernandez\u27 theory of integration was useful in explaining the phases that women went through in learning to live with CD. The three phases of integration identified in this study were the having CD phase, turning point phase and science of one phase. This three-phase process involved the integration of the personal self that existed prior to the diagnosis of CD and the CD self, which emerged after diagnosis. The common problem was discovered to be the necessity of dealing with the two selves. Lifeways, or characteristic patterns of thinking or acting, were found in the first phase and the third phase that kept individuals in that particular phase. Having CD consisted of the lifeways of denying, normalizing, minimizing and personifying. The science of one phase consisted of the lifeways of tuning in and engaging others. Three women were found to be in the having CD phase and one was in the science of one phase. Although more research is required to explore and confirm the study findings, the theory of integration does have potential for use by the advanced practice nurse to improve the physical health and quality of life of individuals living with CD. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2002 .C65. Source: Masters Abstracts International, Volume: 41-04, page: 1056. Adviser: Cheri Hernandez. Thesis (M.Sc.)--University of Windsor (Canada), 2002