Influence of heat treatment on mechanical properties of 300M steel

Tests show that 300M steel should be austenitized at temperatures above 1,800 deg. F to yield best combintion of strength and thickness. Tempering should be performed at temperatures between 400 and 600 deg.

Active control of primary mirror of an orbiting telescope with thermal excitation

The generalization is presented that was made to model a layered structure of a kind that represents a light-weighted mirror. This theory is presented along with the strategy for error suppression. The results of a variety of error-suppression studies are also presented. The computer programs for all parts of this study are included

Design and analysis of unloading and tiedown systems. Apollo logistics support systems MOLAB studies Technical report, 1 Oct. - 7 Dec. 1964

Remote control systems for unloading lunar mobile laboratory from lunar excursion module truck - logistic

Eigenvalue assignment strategies in rotor systems

The work done to establish the control and direction of effective eigenvalue excursions of lightly damped, speed dependent rotor systems using passive control is discussed. Both second order and sixth order bi-axis, quasi-linear, speed dependent generic models were investigated. In every case a single, bi-directional control bearing was used in a passive feedback stabilization loop to resist modal destabilization above the rotor critical speed. Assuming incomplete state measurement, sub-optimal control strategies were used to define the preferred location of the control bearing, the most effective measurement locations, and the best set of control gains to extend the speed range of stable operation. Speed dependent control gains were found by Powell's method to maximize the minimum modal damping ratio for the speed dependent linear model. An increase of 300 percent in stable speed operation was obtained for the sixth order linear system using passive control. Simulations were run to examine the effectiveness of the linear control law on nonlinear rotor models with bearing deadband. The maximum level of control effort (force) required by the control bearing to stabilize the rotor at speeds above the critical was determined for the models with bearing deadband

Study on application of aerospace technology to improve surgical implants

The areas where aerospace technology could be used to improve the reliability and performance of metallic, orthopedic implants was assessed. Specifically, comparisons were made of material controls, design approaches, analytical methods and inspection approaches being used in the implant industry with hardware for the aerospace industries. Several areas for possible improvement were noted such as increased use of finite element stress analysis and fracture control programs on devices where the needs exist for maximum reliability and high structural performance

Surviving The Affair: A Qualitative Phenomenological Case Study Of The Strategies Couples Utilize To Repair Their Marriage Successfully After The Occurrence Of Infidelity

This research explores couples\u27 strategies in reconstructing their marriage after infidelity, thereby avoiding divorce. The research questions provide a clear focus on the discovery process through a phenomenological design and the use of semi-structured interviews. The literature review illustrates the history of marriage, fidelity, infidelity, predictors, general reasons for infidelity, the impact on the marriage, and tools utilized by couples who successfully repair their marriage after infidelity. The methods section provides a framework for implementing the study and includes details about the process of recruiting participants, interviewing participants, transcript review, codes, and theme development. The presentation of the findings illuminates the themes that cultivate a deeper understanding of the phenomenon through the lens of the clinicians and married participants. Implications for further study, limitations, and implications are described in the conclusions

1980 Survey of International Law in the Second Circuit

The purpose of this article is to survey those cases decided in 1980 by the Second Circuit Court of Appeals and federal district courts in New York that involved or impacted upon international law, international relations, or international commerce