Space Power Volume 11 Number 1 1992

Cover	1
Editors Page	2
Table of Contents	3
Extraterrestrial Resources:Implications From Terrestrial Experience by Stephen Gillett and David Kuck	5
Summary	5
Introduction	5
The Complexity of Natural Materials	6
Compositional complexity	6
Heterogeneity	8
Concentrating the Ore Mineral	10
Mine Development Stages	11
Exploration	11
Laboratory testing	11
Pilot Plant Test	11
Full Scale Mine and Plant Start Up	12
Exploration	12
Laboratory Testing	13
Pilot Plant Test	14
Full Scale Mine Concentrator and Recovery Plant Start Up	15
Conclusion	16
References	16
The Environmental Benefits of Solar Power Satellites by Raymond Lonard	19
Summary	19
Introduction	19
Environmental Impact of Building SPS	20
The Environment Benefit of SPS	21
SPS and the Industrialized Nations	23
Benefits to Developing Countries	25
Developmental Ethics	26
Moral Questions, Moral Justifications	27
Conclusions	27
Acknowledgements	28
References	28
Experimental Radiation Cooled Magnetrons for Space Use by William C "Bill" Brown	29
Summary	29
Introduction	29
Theoretical Study of Magnetron Directional Amplifier Radiation Cooling	32
Experimental Evaluation of the QKH 2244	38
Design and Testing of the Radiating Fin	39
Designing and Acquiring Suitable Permanent Magnets for High Temperature Operation	42
Typical Electrical Performance of the Radiation Cooled Magnetrons	44
Conclusion	44
Acknowledgements	44
References	44
Impact of the Space Program on the U.S. Economy: National and State Analyses by Roger Bezek and Robert Wendling	45
Summary	45
Introduction: Economic Effects of the Space Program	46
The Effects on Each State	60
A Distribution of the Benefits Among States	61
Detailed Effects on Louisiana and Indiana	63
Summary and Conclusions	64
Acknowledgements	65
References	65
Appendix: The MISI Approach Esitmating the Total Economic Benefit	66
Antenna Synthesis for the SPS Microwave Power Transmission System by VA Vanke, AA Zaporozhets and AV Rachnikov	69
Summary	69
Introduction	69
The SPS Microwave Power Transmission System with a Radially Polarized Field at the Antennas	70
Amplitude-phase Distribution Synthesis Method	73
Electricity Cost Minimization	80
Summary	81
References	81
Illumination Tapers Synthesis for Adaptive Microwave Power Transmission Systems with Variable Distance Between the Antennas by AA Zaporozhets	83
Summary	83
Introduction	83
Adaptive Microwave Power Transmission System Design	84
Antenna Theory	85
The Maximum Distance Between the Antennas	89
The Minimum Distance Between the Antennas	89
Range of Distance Change Maximization	92
Transmitted Power Maximization	95
Calculation of Systems Characteristics	96
Conclusion	97
Acknowledgments	98
References	98
Back Cover Contents	100

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