Large Deployable Reflector (LDR) system concept and technology definition study. Volume 2: Technology assessment and technology development plan

A study was conducted to define reasonable and representative LDR system concepts for the purpose of defining a technology development program aimed at providing the requisite technological capability necessary to start LDR development by the end of 1991. This volume presents thirteen technology assessments and technology development plans, as well as an overview and summary of the LDR concepts. Twenty-two proposed augmentation projects are described (selected from more than 30 candidates). The five LDR technology areas most in need of supplementary support are: cryogenic cooling; astronaut assembly of the optically precise LDR in space; active segmented primary mirror; dynamic structural control; and primary mirror contamination control. Three broad, time-phased, five-year programs were synthesized from the 22 projects, scheduled, and funding requirements estimated

Beak Doctor

Beak Doctor is an excerpt from a novel in progress concerning the life of Brennan Madigan as he grows up in northeastern Ireland and later works as a plague doctor in Venice during the Thirty Years War. The excerpt\u27s primary themes are loss, madness, mythology, religion, and mortality

THE USE OF QUALITY AND RATING SCALES FOR EVALUATING INDUSTRIAL ARTS PROJECTS

The main objective of this study is to present to those who may be interested a means of objectively evaluating (grading) industrial art projects. The means used in this study were project rating and quality scales. The information that was used in developing this study was acquired through research in the library on the campus of Kansas State Teachers College, Pittsburg, Kansas, and experiments carried out on the same campus

Large Deployable Reflector (LDR) system concept and technology definition study. Analysis of space station requirements for LDR

A study was conducted to determine how the Large Deployable Reflector (LDR) might benefit from the use of the space station for assembly, checkout, deployment, servicing, refurbishment, and technology development. Requirements that must be met by the space station to supply benefits for a selected scenario are summarized. Quantitative and qualitative data are supplied. Space station requirements for LDR which may be utilized by other missions are identified. A technology development mission for LDR is outlined and requirements summarized. A preliminary experiment plan is included. Space Station Data Base SAA 0020 and TDM 2411 are updated

A wide family of singularity-free cosmological models

In this paper a family of non-singular cylindrical perfect fluid cosmologies is derived. The equation of state corresponds to a stiff fluid. The family depends on two independent functions under very simple conditions. A sufficient condition for geodesic completeness is provided.Comment: 7 pages, RevTeX

A Model for Energy Supply Systems Alternatives and their General Environmental Impact

The overall objective of the energy strategies modelling effort within IIASA's Energy Systems Program is to construct a set of multiregional models of the world to assist in the analysis and evaluation of regional and global energy strategies for the next 15 to 50 years. The energy system of each world region is characterized by a set of interrelated models, each dealing with a different aspect of energy systems analysis. These include (1) models of the macroeconomy; (2) inter-industry product flows; (3) energy demand; (4) primary energy resources; (5) energy supply technologies and their environmental impact; and of (6) the direct and indirect investment and operational requirements of energy systems. A global balance model of interregional trade in energy resources is under preparation for linking the set of regional models together. The present paper is concerned with item 5 above, namely the model MESSAGE, a Model for Energy Supply System Alternatives and Their General Environmental Impact. MESSAGE is formulated as a dynamic linear program for the comparison of new and existing supply technologies for the primary, secondary and end-use conversion and distribution of energy to satisfy each of the different components of a given energy demand. Constraints are imposed by the availability of primary energy resources and the carrying capacity of the environment. MESSAGE is an instrument designed to compare different energy supply and end-use technologies and to explore the consequences of pursuing a wide range of possible energy supply strategies under various assumptions concerning: the availability of primary energy supply; future energy conversion technologies; different levels of energy demand and end-use patterns; environmental control; and conservation of energy. The purpose of MESSAGE in particular, and of the modelling effort of the Energy Systems Program in general, is not to make predictions or forecasts but to clarify some of the major worldwide consequences of taking alternative energy policy choices at the regional and global levels. Although the model described here was conceived as an integral part of the multiregional energy study of the Energy Systems Program, it is a consistent entity which could be used independently of the other models in evaluating the energy supply strategies of individual nations