Space shuttle main engine vibration data base

The Space Shuttle Main Engine Vibration Data Base is described. Included is a detailed description of the data base components, the data acquisition process, the more sophisticated software routines, and the future data acquisition methods. Several figures and plots are provided to illustrate the various output formats accessible to the user. The numerous vibration data recall and analysis capabilities available through automated data base techniques are revealed

High frequency data acquisition system for space shuttle main engine testing

The high frequency data acquisition system developed for the Space Shuttle Main Engine (SSME) single engine test facility at the National Space Technology Laboratories is discussed. The real time system will provide engineering data for a complete set of SSME instrumentation (approx. 100 measurements) within 4 hours following engine cutoff, a decrease of over 48 hours from the previous analog tape based system

Space shuttle main engine vibration data base

In order to evaluate Space Shuttle Main Engine (SSME) vibration data without having to constantly replay analog tapes, the SSME Vibration Data Base was developed. This data base contains data that have been digitized at a high sample rate for the entire test duration. It provides quick and efficient recall capabilities for numerious computation and display routines. The data base components are described as well as some of the compution and display features

Trajectory optimization using regularized variables

Regularized equations for a particular optimal trajectory are compared with unregularized equations with respect to computational characteristics, using perturbation type numerical optimization. In the case of the three dimensional, low thrust, Earth-Jupiter rendezvous, the regularized equations yield a significant reduction in computer time

Why Congressional Republicans may come to regret moving so quickly with their Obamacare repeal and replacement bill.

Congressional Republicans are now moving rapidly to push through the American Health Care Act, which would repeal and replace President Obama’s signature health care reform, Obamacare. Jonathan Lewallen writes that the GOP’s haste could backfire on them. Writing legislation is a skill, he argues, and in a time of both unified government and budget cuts to Legislative Counsel offices, the chances of the party making a legislative mistake are considerably increased

Poverty and Cataract—A Deeper Look at a Complex Issue

Susan Lewallen discusses a new study that shows an association between visual impairment from cataract and poverty in three low-income countries

Improving Nurses Knowledge of Delirium and Implementation of the R.A.D.A.R. Screening Tool at two Post Acute Care Facilities in the United States

Delirium in post acute care patients is under-recognized and linked to poor patient outcomes. Nurses in the post acute care setting are currently not using a standardized tool for assessing delirium, but the literature suggests they should do this routinely. The purposes of this study were to evaluate methods for improving the management of delirium in post acute care and to evaluate the implementation of a new screening tool for delirium (Recognizing Active Delirium As Routine or R.A.D.A.R.). This quasi-experimental study was conducted at two post acute care facilities in an urban location. The study included the implementation of a delirium education program, as well as information on the administration of the R.A.D.A.R. Delirium knowledge improvement was evaluated by comparing pre and post test scores. The post test scores were measured twice; the first time immediately after the education session, and then three months later. The results demonstrated that the nurses’ knowledge of delirium improved significantly at both post tests (

When Image Isn’t Everything: The Effects of Instagram Frames on Social Comparison

In recent years visual social media have become increasingly popular mechanisms for communication.  Past research suggests links between using social media, upward social comparison, and negative affect.  The present online experiment of U.S. women (N = 58) takes a media psychology approach to understanding how text frames on image-based social media contribute to social comparison and perceptions of the self. Findings suggest that individuals who were in a body-positive experimental condition reported higher levels of self-esteem than did the women in a body-negative experimental condition. Those in the negative conditions ranked significantly higher on state social comparison with the images than those in the positive condition. Additionally, women who compared themselves to the women in the experimental images were also more likely to fantasize that they could achieve the look and lifestyle of the women featured in the images. Findings are discussed in light of framing theory and social comparison theory and suggestions are made for future experimental work