Orbiter based construction equipment

Many orbiter based activities need equipment to hold a payload steady while it is being worked on. This work may be construction, updating, repair, services, check out, or refueling operations in preparation for return to Earth. The Handling and Positioning Aid (HPA) is intended for use as general purpose equipment. The HPA provides a wide choice of work station positions, both immediately above the orbiter cargo bay and beyond. It can act in a primary docking role and, if required, can assist actively in the berthing process. From an analysis of ten reference missions, it was determined that two types of HPA mobility are needed; a tilt table, which simply swings out of the cargo bay, pivoting about an athwartships y axis, and an articulated arm. Illustration of the aid are provided

Price Dynamics in International Wheat Markets

Vector autoregressions are used to evaluate dynamic relationships among prices in six important international wheat markets. The effects of freight rates and exchange rates are also considered. The results indicate that Canada is the dominant market, supporting views that Canada is an oligopolistic price leader.international trade, vector autoregressions, wheat markets, International Relations/Trade,

PRICE TRANSMISSION, THRESHOLD BEHAVIOR, AND ASYMMETRIC ADJUSTMENT IN THE U.S. PORK SECTOR

The US pork sector has experienced many significant structural changes in recent years. Such changes may have influenced price dynamics and transmission of shocks through marketing channels. We investigate linkages among farm, wholesale, and retail markets using weekly price data for the period covering 1987 through 1998. Our analysis uses a threshold cointegration model that permits asymmetric adjustment to positive and negative price shocks. Our results reveal important asymmetries. Our results are consistent with existing literature which has determined that price adjustment patterns are unidirectional and that information tends to flow from farm, to wholesale, to retail markets.asymmetric price transmission, vertical price transmission, error correction, thresholds, pork markets, Demand and Price Analysis, Livestock Production/Industries,

Apollo PLSS: Environmental control of the smallest manned space vehicle

The production of a portable life support system (PLSS) and associated backup equipment for supporting an astronaut working outside of the lunar module (LM) either in space or on the lunar surface is reported. Described are the system, the philosophy behind its design, basic requirements imposed on the system, and some of the evolutionary processes that led to the present configuration

Expert system verification concerns in an operations environment

The Space Shuttle community is currently developing a number of knowledge-based tools, primarily expert systems, to support Space Shuttle operations. It is proposed that anticipating and responding to the requirements of the operations environment will contribute to a rapid and smooth transition of expert systems from development to operations, and that the requirements for verification are critical to this transition. The paper identifies the requirements of expert systems to be used for flight planning and support and compares them to those of existing procedural software used for flight planning and support. It then explores software engineering concepts and methodology that can be used to satisfy these requirements, to aid the transition from development to operations and to support the operations environment during the lifetime of expert systems. Many of these are similar to those used for procedural hardware

REGIONAL FED CATTLE PRICE DYNAMICS

The lead-lag relationships present in the regional price discovery process are important indicators of market performance. Differences across markets in the speed of adjustment to evolving information may have implications for pricing efficiency within these markets. This study estimates intertemporal price relationships among 11 regional slaughter cattle markets. Larger volume markets, located in the major cattle feeding regions, were the dominant price discovery locations. Price adjustments across markets were complete in one to two weeks in the large volume markets located relatively close to each other and in two to three weeks in the more remote, smaller volume markets.Demand and Price Analysis, Livestock Production/Industries,

Analysis of a communication satellite for lunar far-side exploration

Analysis of communication satellite for lunar far-side exploration relaying color television, voice, high-bit-rate telemetry data, and ranging code from command and service, and lunar module

Living up to our students’ expectations – using student voice to influence the way academics think about their undergraduates learning and their own teaching

Understanding the student learning experience is essential if Higher Education Institutions (HEI) are to provide an education for the 21st century. This study investigated students’ perspectives on their learning experiences and offered undergraduates a chance to influence the way academics think about learning and teaching.Participants were drawn from two UK HEIs and a semi structured focus group approach was adopted. A total of nine focus groups consisting of 3-7 participants were drawn from across all Sport degree year groups in both institutions. Assessment, pedagogy and teacher characteristics emerged as primary concerns across both institutions. Assessment was appreciated by all students as key to their learning but was exposed as being overly traditional and rigid in its application. Students were unanimous in their support for small group pedagogies, rejecting traditional powerpoint dominated lecturing styles. The emphasis on the behaviour of, and delivery by, tutors was noteworthy.Students appraised the development of their academic skills and confidence, linking these to motivation, knowledge, self-awareness and critical reflection. In doing so they understood the impact of inconsistencies in tutors’ teaching practices. The onus is on every tutor to combine imaginative assessment with dynamic and relational experiences in order to provide a strong foundation for flexible, reflective and creative graduates