Specifying and calibrating instrumentations for wideband electronic power measurements

The wideband electric power measurement related topics of electronic wattmeter calibration and specification are discussed. Tested calibration techniques are described in detail. Analytical methods used to determine the bandwidth requirements of instrumentation for switching circuit waveforms are presented and illustrated with examples from electric vehicle type applications. Analog multiplier wattmeters, digital wattmeters and calculating digital oscilloscopes are compared. The instrumentation characteristics which are critical to accurate wideband power measurement are described

Optimization of fringe-type laser anemometers for turbine engine component testing

The fringe type laser anemometer is analyzed using the Cramer-Rao bound for the variance of the estimate of the Doppler frequency as a figure of merit. Mie scattering theory is used to calculate the Doppler signal wherein both the amplitude and phase of the scattered light are taken into account. The noise from wall scatter is calculated using the wall bidirectional reflectivity and the irradiance of the incident beams. A procedure is described to determine the optimum aperture mask for the probe volume located a given distance from a wall. The expected performance of counter type processors is also discussed in relation to the Cramer-Rao bound. Numerical examples are presented for a coaxial backscatter anemometer

Laser anemometry for hot section applications

Laser anemometers (LA's) for use in the study of the hot section components of turbomachinery are being developed. Specifically, laser anemometers are being developed for use in the 50.8-cm (20-in.) diameter warm turbine and high-pressure turbine (HPT) facilities at Lewis. A brief review of the status of the program along with some preliminary data taken in an open-jet burner are presented

Laser anemometers of hot-section applications

Laser anemometers are being developed for use in the turbine facilities at Lewis that are involved in the Turbine Engine Hot Section Technology Program. The status of the program is given along with some results accomplished since 1983

sj-docx-1-jdm-10.1177_87564793221123020 – Supplemental material for Utilizing Simulation as a Means to Teach Diagnostic Medical Sonography: A Multi-Site Discipline-Based Educational Research Project

Supplemental material, sj-docx-1-jdm-10.1177_87564793221123020 for Utilizing Simulation as a Means to Teach Diagnostic Medical Sonography: A Multi-Site Discipline-Based Educational Research Project by Kevin D. Evans, Sundus H. Mohammad, Nicole Stigall-Weikle, Qian Yang and Carolyn M. Sommerich in Journal of Diagnostic Medical Sonography</p

Competition and Conflict : Union Growth in the US Hospital Industry

The combination of the changes in the US hospital industry and resulting pressures on the workforce with the relative immobility of hospitals has led to the growth of unions in this industry while unions are losing members in most other industries. In the last four decades the vast majority of US hospitals have become organised into corporate systems along classically capitalist profit-making lines. Drawing on theoretical work that places changing work experience as a major factor in pro-union behaviour, the article will examine how the rise of competition among private hospital systems has led hospital managements to adopt ‘lean production’ methods borrowed from manufacturing. The consequent pressures on the workforce have encouraged workers to join unions. These same forces have shaped the content of collective bargaining and divergent styles of unionism. As the transformation of hospitals are a piece of the broader neoliberal era in which they occur, this analysis should be applicable to certain other industries as well.Peer reviewe