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A variety of Advanced Propulsion Concepts (APC) is discussed. The focus is on those concepts that are sufficiently near-term that they could be developed for the Space Exploration Initiative. High-power (multi-megawatt) electric propulsion, solar sails, tethers, and extraterrestrial resource utilization concepts are discussed. A summary of these concepts and some general conclusions on their technology development needs are presented.
Sixth International Planetary Probe Workshop
Thick terms and concepts in ethics (e.g. selfish, cruel and courageous) somehow combine evaluation and non-evaluative description. The non-evaluative aspects of thick terms and concepts underdetermine their extensions. Many writers argue that this underdetermination point is best explained by supposing that thick terms and concepts are semantically evaluative in some way such that evaluation plays a role in determining their extensions. This paper argues that the extensions of thick terms and concepts are underdetermined by their meanings in toto, irrespective of whether their extensions are partly determined by evaluation; the underdetermination point can therefore be explained without supposing that thick terms and concepts are semantically evaluative. My argument applies general points about semantic gradability and context-sensitiv...
Research and advanced concepts - laminarization in nozzle flow, liquid metal magnetohydrodynamic power conversion, swirling and nonswirling gas flow, magnetic field effects in square channel
Machery (2009) suggests that the concept of “concept” is too heterogeneous to serve as a “natural kind” for scientific explanation, so cognitive science should do without concepts. I second the suggestion, and propose substituting, in place of concepts, inborn and acquired sensorimotor category-detectors and category-names combined into propositions that define and describe further categories.
Machery (2009) suggests that the concept of “concept” is too heterogeneous to serve as a “natural kind” for scientific explanation, so cognitive science should do without concepts. I second the suggestion, and propose substituting, in place of concepts, inborn and acquired sensorimotor category-detectors and category-names combined into propositions that define and describe further categories.
This short dialogue, in Socratic prose, explores some of the most fundamental constructs in cognition: Concepts, thinking and analogy. In short, concepts are the atoms of thought and analogy is the 'ether' of concept formation. Therefore, thinking is the process of triggering memories through analogy.
Avionics System Concepts to meet technology needs of advanced helicopter integrated cockpit design are identified. Specific avionics system concepts which should be conducted and/or support by NASA to most effectively aid industry in advanced helicopter integrated cockpit design are also identified. Candidate Missions and Mission Requirements to meet technology needs are considered.
An overview of microwave beamed power concepts is given in outline form. Concepts such as power transmission to operational satellites, spacecraft propulsion, lunar/planetary outpost power and planetary rover propulsion are listed in chart form and characterized in columns titled power level, benefits, and comments.
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