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Concepts and analysis for precision segmented reflector and feed support structures

Several issues surrounding the design of a large (20-meter diameter) Precision Segmented Reflector are investigated. The concerns include development of a reflector support truss geometry that will permit deployment into the required doubly-curved shape without significant member strains. For deployable and erectable reflector support trusses, the reduction of structural redundancy was analyzed to achieve reduced weight and complexity for the designs. The stiffness and accuracy of such reduced member trusses, however, were found to be affected to a degree that is unexpected. The Precision Segmented Reflector designs were developed with performance requirements that represent the Reflector application. A novel deployable sunshade concept was developed, and a detailed parametric study of various feed support structural concepts was performed. The results of the detailed study reveal what may be the most desirable feed support structure geometry for Precision Segmented Reflector/Large Deployable Reflector applications

Developing Broad Business Perspective Competencies By Partnering With Practitioners

The CPA Vision Project - 2011 and Beyond) is a blueprint for the accounting profession of the 21st Century. From this visioning process the AICPA Core Competency Framework for Entry into the Accounting Profession (1999) was developed. It is from this framework that accounting educators are invited to adjust curriculum to provide students with the opportunity to develop these functional, personal, and broad business perspective core competencies so that students can meet the accounting profession challenges of the 21st century. This paper provides a specific model for developing broad business perspective competencies by partnering with a practitioner. Although using professionals in the classroom is not a new idea, this paper offers a unique perspective of the process by juxtaposing the perspectives of the academic and the practitioner in the processes of developing the partnership, planning the classroom event (which includes developing the broad business perspective competencies), designing and collecting student feedback, and evaluating the results of the classroom event and partnership

Drivers of the Value of the Firm: Profitability, Growth, and Capital Intensity

Value-based management systems focus on wealth and the wealth creation process and promote the generation of value for the shareholders. A valuation model for the firm is extended analytically to focus explicitly on profitability, growth, and capital intensity as drivers of the value of the firm. The extended model provides information about the sensitivities of the value of the firm to changes in the firm\u27s profitability, growth, and capital intensity. These sensitivities are presented in terms of changes per dollar of sales and actual dollar changes. The changes per dollar of sales show the relative sensitivities of the changes in the value of the firm resulting from changes in the measures for profitability, growth, and capital intensity. Each dollar amount shows the total dollar changes in the value of the firm resulting from changes in the profitability, growth, and capital intensity measures. These sensitivities show the impact of changes in the profitability, growth, and capital intensity measures on the value of the firm. This information is valuable in helping managers determine a desired course of action to improve the wealth generating ability of the firm by managing these value drivers more effectively

Kansas refraction profiles

Historically, refraction surveys have been conducted in hopes of mapping distinct layers within the earth. Refraction is a useful tool provided its limitations and the assumption that layers increase in seismic velocity with increasing depth are kept in mind. A traditional reversed-refraction profile was conducted along a 500-km (300- mi)-long east-west line extending from Concordia, Kansas, to Agate, Colorado. Analysis of the data showed an average crustal velocity of 6.1 kmlsec (3.7 milsec) and an average upper-mantle P phase velocity of 8.29 kmlsec (4.97 milsec) with a Moho depth calculated to be 36 km (23 mi) on the eastern end and 46 km (29 mi) on the western end. Some evidence suggests velocities as high as 7.2 kmlsec (4.3 milsec) in the crust at various locations along the survey line. The strong east-west regional gravity gradient of -0.275 mgalb supports the seismically drawn conclusion of a thinning of crust in north-central Kansas. In order to supplement the data from this refraction survey, we took advantage of the Kansas earthquake seismograph network. A crustal study using earthquakes as energy sources and a regional earthquake network as seismometer locations resulted in a crustal-velocity model that will improve determination of local earthquake locations. A large anomalous body in the upper mantle/lower crust, assumed to be related to the Precambrian-aged Midcontinent Geophysical Anomaly (MGA), resulted in early Pwave arrivals from refracted energy from the Moho recorded at Concordia, Salina, Tuttle Creek, and Milford. An omnidirectional positive P residual zone near El Dorado may be related to the Wichita geomagnetic low. Some evidence suggests the presence of a lower velocity material on the western and eastern flanks of the MGA, possibly representing the Rice Formation. A P velocity of 8.25 krn/sec±0.1k m/sec (4.95 mi/sec+0.09m i/sec) with the crust thinning from west to east and an apparent thinning from the north and from the south was determined from the 16 regional earthquakes studied. Crustal thickness from central Kansas through western Missouri seems to be relatively consistent