Survey and documentation of emerging technologies for the Satellite Power System (SPS)

The genesis of the solar power satellite (SPS) concept is reviewed historically and the original assumptions and guidelines which led to development of the SPS reference system design concept are discussed. Some guidelines are applicable to almost any SPS design, but others can be changed, leading to new and perhaps preferable systems. In order to stimulate new SPS concepts and to facilitate comparative assessment of emerging SPS technologies, one useful approach is to break the overall system into functional parts. The system functions which must be performed by any SPS concept and the interrelations between them are discussed and a systematic framework is presented for assessing the wide variety of system concepts and subsystem technologies which have been proposed. About 80 alternative SPS technologies are reviewed

Orbital dynamics of large solar power satellites

Designs for geostationary SPS are extremely large in scale, more than an order of magnitude larger than the International Space Station. The problem of how to control the orbital motion of such large structures, accounting for various perturbing forces, is therefore a topic worthy of further study. The primary objective of the proposed research is to perform a detailed study of SPS orbit dynamics, obtaining a comprehensive understanding of the effect of perturbations on orbits of large SPS structures over a time-frame commensurate with proposed SPS lifetimes (30-40 years). Analytical equations derived by the process of averaging of the SPS equations of motion shall be used in determining the long-term orbital behaviour. Previous studies have simply assumed a geostationary orbit (GEO) then designed control systems for maintaining it thus. It is found that an alternative SPS orbital location known as the geosynchronous Laplace plane (GLP) is superior to GEO. An SPS in GLP requires virtually no fuel to maintain its orbit, avoids the main orbital debris population originating from GEO satellites and is extremely robust, i.e. loss of control is inconsequential. The GLP SPS saves of order 10<sup>4</sup> to 10<sup>5</sup> kg per year in fuel compared to a GEO SPS for equivalent power delivery compared to GEO

Acute hypocalcemia and metabolic alkalosis in children on cation-exchange resin therapy

Background. Sodium polystyrene sulfonate (SPS) is a chelating agent used for the treatment of hyperkalemia. SPS has a wide range of exchange capacity requiring close monitoring of serum electrolytes. We observed two patients who developed acute hypocalcemia and increased metabolic alkalosis after initiating SPS therapy. We report these cases to draw attention to the potential risk of this medication in pediatric patients. Case Diagnosis/Treatment. Two children with chronic kidney disease on dialysis were started on SPS for hyperkalemia. Within a week after initiation of the medication, both patients developed hypocalcemia on routine labs without overt clinical manifestations. The hypocalcemia was rapidly corrected with oral supplementation and discontinuation of SPS. Conclusions. Severe hypocalcemia can develop after SPS therapy. The metabolic alkalosis in these patients associated with the hypocalcemia put them at increased risk for complications. Hence, careful attention must be paid to the state of calcium metabolism in all patients receiving SPS. Often calcium supplementation is required to maintain normal calcium levels

Fortified foods with Sangkap Pinoy Seal and the micronutrient intake among selected households in Punta, Sta. Ana, Manila, Philippines : a thesis presented in partial fulfillment of the requirements for the degree of Master of Science in Nutritional Science, Institute of Food, Nutrition and Human Health, Massey University

Text in English with some TagalogThis study evaluated the food fortification program (Sangkap Pinoy Seal Program-SPS) in the Philippines in terms of determining the rate of awareness, attitude and considerations and the factors associated with purchase of fortified foods with SPS among women in a poor urban area in Manila. This study also determined the contribution of SPS foods to total iron and vitamin A intake of their preschool children. A survey was conducted through personal interviews among 134 mothers who were randomly selected from all villages of Punta, Sta. Ana, Manila. Descriptive data showed that around 60% of the participants were aware of SPS foods. In general, a positive perception on SPS foods was demonstrated by the women as reflected in their comments. Majority of these comments associated SPS foods as foods accepted/recommended by the Department of Health, foods with added nutrients and nutritious and safe food to eat. Around 89% of those who were aware exhibited a positive attitude towards fortified foods. Awareness of fortified foods and foods with SPS were significant predictors of purchase of SPS foods. However, even if income was the stronger determinant of purchase than awareness, awareness still had some effect. Around 3% and 6% of the variation in purchase of SPS foods could be attributed to the effects of attitude to fortified foods and total opinion to food and health, respectively. The results of this study also showed that preference of the family and taste were major considerations in purchasing SPS foods among more than half of the sample. These findings suggest that the participants purchased SPS foods not mainly because of added nutrients. Intakes of energy and vitamin A among the respondents' preschooler children were considered adequate. However, their iron intake was found to be less adequate. A remarkable finding of this research study was the significant contributions of SPS foods to iron and vitamin A intakes of the children in achieving the RDA. There was 53% increase on the number of children whose vitamin A intake was less than 50% of the RDA if SPS foods were taken out from the diet. SPS foods contributed around 27.6% to total vitamin A intake of the children. Without, the contribution of iron from SPS foods, there was 44% decrease on the number of children whose iron intake was greater than 75% of the RDA and 100% increase on the number of children whose iron intake was less than 50% of the RDA. Hence, iron and vitamin A from SPS foods did have an impact in the nutritional status of the children. The findings of the study may provide vital information to the food fortification program and pose a challenge to nutrition educators. The results are discussed in relation to the previous literature and recommendations are presented with particular emphasis on the implications for future research. In conclusion, SPS foods may have a good potential to improve the nutritional status of the children

Gallium arsenide (GaAs) power conversion concept

A summary design analysis of a GaAs power conversion system for the solar power satellite (SPS) is presented. Eight different satellite configuration options for the solar arrays are compared. Solar cell annealing effects after proton irradiation are considered. Mass estimates for the SPS and the effect of solar cell parameters on SPS array design are discussed

Integration of SPS with utility system networks

The integration of Satellite Power System (SPS) power in electric utility power systems is discussed. Specifically, the nature of the power output variations from the spacecraft to the rectenna, the operational characteristics of the rectenna power, and the impacts on the electric utility system from utilizing SPS power to serve part of the system load are treated. It is concluded that if RF beam control is an acceptable method for power control, and that the site distribution of SPS rectennas do not cause a very high local penetration (40 to 50%), SPS may be integrated into electric utility system with a few negative impacts. Increased regulating duty on the conventional generation, and a potential impact on system reliability for SPS penetration in excess of about 25% appear to be two areas of concern

Barriers against Agricultural Exports from Pakistan: The Role of WTO Sanitary and Phytosanitary Agreement

There has been growing recognition that Sanitary and Phytosanitary (SPS) agreement can impede trade in agricultural and food products. Pakistan, in particular experiences problems in meeting the SPS requirements of developed countries and, it is claimed, this can seriously impede its ability to export agricultural and food products. Attempts have been made to reduce the trade distortive effects of SPS measures through, for example, the World Trade Organisation (WTO) SPS Agreement, although it is claimed that current initiatives fail to address many of the key problems experienced by Pakistan and other developing countries. The present paper explores implications of Sanitary and Phytosanitary (SPS) agreement on exports of agricultural and food products from Pakistan. It identifies the problems that Pakistan faces in meeting SPS requirements and how these relate to the nature of SPS measures and the compliance resources available to Government of Pakistan and the supply chain. The paper examines the impact of SPS agreement on the extent to which SPS measures impede exports from Pakistan. It identifies the problems that limit participation of Pakistan in the SPS agreement and its concerns about the way in which it currently operates. The paper is organised into seven sections. In Section II salient features of the SPS agreement are highlighted. Section III delineates key issues arising from the implementation of SPS measures. Section IV summarises factors determining limits to effective participation of Pakistan and other developing countries in the SPS agreement. Section V outlines main concerns of Pakistan to the adoption and implementation of SPS measures. Section VI presents brief note on wider implications of SPS agreement for Pakistan. And finally Section VII summarises main conclusions and outlines policy measures

Comparison of space-time evolutions of hot/dense matter in sNN\sqrt{s_{NN}}=17 and 130 GeV relativistic heavy ion collisions based on a hydrodynamical model

Based on a hydrodynamical model, we compare 130 GeV/$A$ Au+Au collisions at RHIC and 17 GeV/$A$ Pb+Pb collisions at SPS. The model well reproduces the single-particle distributions of both RHIC and SPS. The numerical solution indicates that huge amount of collision energy in RHIC is mainly used to produce a large extent of hot fluid rather than to make a high temperature matter; longitudinal extent of the hot fluid in RHIC is much larger than that of SPS and initial energy density of the fluid is only 5% higher than the one in SPS. The solution well describes the HBT radii at SPS energy but shows some deviations from the ones at RHIC.Comment: 28 pages, 21 figures, REVTeX4, one figure is added and some figures are replace

A power satellite sonic simulator

A simulator is described which generates and transmits a beam of audible sound energy mathematically similar to the solar power satellite (SPS) power beam. The simulator provides a laboratory means for analysis of ground based closed loop SPS phase control and of ionospheric effects on the SPS microwave power beam