War in the Great Northwest

"The author, W.V. Rinehart, was a well known pioneer of the Pacific northwest… He was a distinguished member of the Military Order of the Loyal Legion. This paper was read by him before the Tacoma, 1914, meeting of that organization.

Cyclical tests of selected space shuttle TPS metallic materials in a plasma arc tunnel Volume 1: Description of tests and program summary

Work, concerned with cyclical thermal evaluation of selected space shuttle thermal protection system (TPS) metallic materials in a hypervelocity oxidizing atmosphere that approximated an actual entry environment, is presented. A total of 325 sample test hours were conducted on 21 super-alloy metallic samples at temperatures from 1800 to 2200 F (1256 to 1478 K) without any failures. The 4 x 4 in. (10.2 x 10.2 cm) samples were fabricated from five nickel base alloys and one cobalt base alloy. Eighteen of the samples were cycled 100 times each and the other three samples 50 times each in a test stream emanating from an 8 in. (20.3 cm) diam exit, Mach 4.6, conical nozzle. The test cycle consisted of a 10 min heat pulse to a controlled temperature followed by a 10 min cooldown period. The TD-NiCrAl and TD-NiAlY materials showed the least change in weight, thickness, and physical appearance even though they were subjected to the highest temperature environment

Cyclical Tests of Selected Space Shuttle TPS Metallic Materials in a Plasma Arc Tunnel. Volume 2: Appendices - Data Tabulation

Calibration data are presented for heat flux and pressure profiles, model temperature histories, and model weight and thickness changes

Bottom-up or Top-down? Removing the Privacy Law Obstacles to Healthcare Reform in the National Healthcare Crisis

Issues of healthcare availability and quality are among the most profound facing our nation. If a high-quality, accessible healthcare system of a truly national nature is to be devised, electronic connectivity—including increased use of electronic medical records and similar technological advances—must be a key feature. Yet such connectivity may give rise to patients’ concerns regarding the privacy of their medical information. Because such concerns demand respect, a challenge lies in balancing patients’ privacy interests against the important information-sharing interests underlying a national healthcare network. The Health Insurance Portability & Accountability Act (HIPPAA) is a key federal law that addresses many privacy issues regarding patients’ medical information, but HIPAA does not preempt state laws that furnish greater privacy protection than HIPAA provides. Accordingly, there exists a patchwork quilt of differing privacy protection provisions. This Article explores the issues just outlined and stresses the importance of a stronger federal role in standardizing medical information privacy rules, so that the current patchwork quilt of privacy regulations does not impede the development of a national healthcare network

Bottom-up or Top-down? Removing the Privacy Law Obstacles to Healthcare Reform in the National Healthcare Crisis

Issues of healthcare availability and quality are among the most profound facing our nation. If a high-quality, accessible healthcare system of a truly national nature is to be devised, electronic connectivity—including increased use of electronic medical records and similar technological advances—must be a key feature. Yet such connectivity may give rise to patients’ concerns regarding the privacy of their medical information. Because such concerns demand respect, a challenge lies in balancing patients’ privacy interests against the important information-sharing interests underlying a national healthcare network. The Health Insurance Portability & Accountability Act (HIPPAA) is a key federal law that addresses many privacy issues regarding patients’ medical information, but HIPAA does not preempt state laws that furnish greater privacy protection than HIPAA provides. Accordingly, there exists a patchwork quilt of differing privacy protection provisions. This Article explores the issues just outlined and stresses the importance of a stronger federal role in standardizing medical information privacy rules, so that the current patchwork quilt of privacy regulations does not impede the development of a national healthcare network

Sensor Selection for Aircraft Engine Performance Estimation and Gas Path Fault Diagnostics

This paper presents analytical techniques for aiding system designers in making aircraft engine health management sensor selection decisions. The presented techniques, which are based on linear estimation and probability theory, are tailored for gas turbine engine performance estimation and gas path fault diagnostics applications. They enable quantification of the performance estimation and diagnostic accuracy offered by different candidate sensor suites. For performance estimation, sensor selection metrics are presented for two types of estimators including a Kalman filter and a maximum a posteriori estimator. For each type of performance estimator, sensor selection is based on minimizing the theoretical sum of squared estimation errors in health parameters representing performance deterioration in the major rotating modules of the engine. For gas path fault diagnostics, the sensor selection metric is set up to maximize correct classification rate for a diagnostic strategy that performs fault classification by identifying the fault type that most closely matches the observed measurement signature in a weighted least squares sense. Results from the application of the sensor selection metrics to a linear engine model are presented and discussed. Given a baseline sensor suite and a candidate list of optional sensors, an exhaustive search is performed to determine the optimal sensor suites for performance estimation and fault diagnostics. For any given sensor suite, Monte Carlo simulation results are found to exhibit good agreement with theoretical predictions of estimation and diagnostic accuracies

Sensor Selection for Aircraft Engine Performance Estimation and Gas Path Fault Diagnostics

This paper presents analytical techniques for aiding system designers in making aircraft engine health management sensor selection decisions. The presented techniques, which are based on linear estimation and probability theory, are tailored for gas turbine engine performance estimation and gas path fault diagnostics applications. They enable quantification of the performance estimation and diagnostic accuracy offered by different candidate sensor suites. For performance estimation, sensor selection metrics are presented for two types of estimators including a Kalman filter and a maximum a posteriori estimator. For each type of performance estimator, sensor selection is based on minimizing the theoretical sum of squared estimation errors in health parameters representing performance deterioration in the major rotating modules of the engine. For gas path fault diagnostics, the sensor selection metric is set up to maximize correct classification rate for a diagnostic strategy that performs fault classification by identifying the fault type that most closely matches the observed measurement signature in a weighted least squares sense. Results from the application of the sensor selection metrics to a linear engine model are presented and discussed. Given a baseline sensor suite and a candidate list of optional sensors, an exhaustive search is performed to determine the optimal sensor suites for performance estimation and fault diagnostics. For any given sensor suite, Monte Carlo simulation results are found to exhibit good agreement with theoretical predictions of estimation and diagnostic accuracies

Wake Structure Induced by Seal Whisker: Effects of Angle of Incidence

Seal whiskers have been found to produce unique wake flow structures that minimize self-induced vibration and reduce drag. The cause of these wake features are due to the peculiar three-dimensional morphology of the whisker surface. The whisker can be defined as an elliptical cross section with variation in the major and minor axis of the ellipse along the length of the whisker as well as rotation of the elliptical plane with respect to the whisker axis, angle of incidence. While the effects of several dominant parameters of the whisker morphology have been studied, the effect of the rotation of the elliptical plane has not been well understood. This paper will examine the influence of the angle of incidence on the wake flow structure through series of water channel studies. Several models of whisker-like geometries will be tested which isolate the rotation angle as the only variation between models. The wake structure behind each seal whisker model will be measured through particle image velocimetry (PIV). The different models wake structures will be compared identifying the effect of angle of incidence on the wake structure. Angle of incidence was found to influence the wake structure through reorganization of velocity patterns, reduction of recovery length and modification of magnitude of Tu. These results help provide a more complete understanding of the seal whisker geometry relationship to wake structure and can provide insight into design practices for application of whisker geometery to various engineering problems

War in the Great Northwest

"The author, W.V. Rinehart, was a well known pioneer of the Pacific northwest… He was a distinguished member of the Military Order of the Loyal Legion. This paper was read by him before the Tacoma, 1914, meeting of that organization.

Evaluation of the Maser-equipped Radar Set AN/MPS-34 and Area Precipitation Measurement Indicator: Final Report

published or submitted for publicationis peer reviewedOpe