RUSAP: A computer program for the calculation of Roll-Up Solar Array Performance characteristics

RUSAP is a FORTRAN 4 computer program designed to determine the performance characteristics (power-to-weight ratio, blanket tension, structural member section dimensions, and resonant frequencies) of large-area, roll-up solar arrays of the single-boom, tensioned-substrate design. The program includes the determination of the size and weight of the base structure supporting the boom and blanket and the determination of the blanket tension and deployable boom stiffness needed to achieve the minimum-weight design for a specified frequency for the first mode of vibration. A complete listing of the program, a description of the theoretical background, and all information necessary to use the program are provided

Parametric study of the performance characteristics and weight variations of large-area roll-up solar arrays

Performance characteristics and weight variations of large area, roll-up, solar array

Design and use of multiple blade slurry sawing in a production atmosphere

The technique and uses of the multiple blade slurry (MBS) saw are considered. Multiple bands of steel are arranged in a frame and the frame is reciprocated with the steel bands to a workpiece, while simultaneously applying abrasive at the point of contact. The blades wear slots in the workpiece and progress through the piece resulting in several parts of wafers. The transition to MBA from diamond slicing is justified by savings resulting from minimized kerf losses, minimized subsurface damage, and improved surface quality off the saw. This allows wafering much closer to finished thickness specifications. The current state of the art MBS technology must be significantly improved if the low cost solar array (LSA) goals are to be attained. It is concluded that although MBS will never be the answer to every wafering requirement, the economical production of wafers to LSA project specifications will be achieved

Investigation of passive shock wave-boundary layer control for transonic airfoil drag reduction

The passive drag control concept, consisting of a porous surface with a cavity beneath it, was investigated with a 12-percent-thick circular arc and a 14-percent-thick supercritical airfoil mounted on the test section bottom wall. The porous surface was positioned in the shock wave/boundary layer interaction region. The flow circulating through the porous surface, from the downstream to the upstream of the terminating shock wave location, produced a lambda shock wave system and a pressure decrease in the downstream region minimizing the flow separation. The wake impact pressure data show an appreciably drag reduction with the porous surface at transonic speeds. To determine the optimum size of porosity and cavity, tunnel tests were conducted with different airfoil porosities, cavities and flow Mach numbers. A higher drag reduction was obtained by the 2.5 percent porosity and the 1/4-inch deep cavity

Research poster: Vegetation change in the Newberry Mountains of southern Nevada

Research poste

Buyer Monitoring: A Means to Insure Personalized Service

Marketing scholars propose that service employees play a primary role in delivering service quality. However, the question of how to motivate service employees to enhance service production has received little research attention. The authors address this gap by advocating a control mechanism first discussed in the economics literature—buyer monitoring. The authors focus on a pervasive form of buyer monitoring, voluntary tipping, and examine the effectiveness of this control mechanism as a means of improving service in two different contexts: leisure cruises and restaurant dining. Despite a substantial interdisciplinary literature reporting a weak relationship between customer perceptions of service and their tipping behavior, results show that a policy of voluntary tipping has positive effects on the motivation and behavior of service workers and on customers’ perceptions of the service those workers provide. These findings call attention to buyer monitoring as both a topic for academic research and a practical mechanism for motivating service employees. The findings also call into question trends away from tipping in service contexts such as the cruise industry and suggest that many service businesses for which tipping is not viable may benefit from alternative forms of buyer monitoring