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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 163 records · Page 9
All sourcesNASA NTRSDOE OSTI
NASA NTRS1975

Optimal policies for identification of stochastic linear systems

The problem of designing closed-loop policies for identification of multiinput-multioutput linear discrete-time systems with random time-varying parameters is considered in this paper using a Bayesian approach. A sensitivity index gives a measure of performance for the closed-loop laws. The computation of the optimal laws is shown to be nontrivial, an exercise in stochastic control, but open-loop, affine, and open-loop feedback optimal inputs are shown to yield tractable problems. Numerical examples are given. For time-invariant systems, the criterion considered is shown to be related to the trace of the information matrix associated with the system.

Lopez-Toledo, A. A.↗
NASA NTRS1976

Public policy for solar heating and cooling

Recent analyses indicated that solar heating and cooling systems for residential buildings are nearly economically competitive with conventional fossil fuel or electric systems, the former having higher initial cost but a lower operating cost than the latter. The paper examines obstacles to the widespread acceptance and use of solar space conditioning systems and explores some general policies which could help to overcome them. The discussion covers such institutional barriers limiting the adoption of solar technologies as existing building codes, financing constraints, and organizational structure of the building industry. The potential impact of financial incentives is analyzed. It is noted that a tax incentive of 25% could speed the use of solar energy by 7 to 8 years and produce an 8% reduction in fossil fuel use by 1990. A preliminary incentive package which could be helpful in promoting solar energy both at federal and state levels is proposed, and the necessary incentive level is analysed.

Hirshberg, A. S.↗
NASA NTRS1980

Federal policies to promote the widespread utilization of photovoltaic systems. Supplement: Review and critique

Review comments of the Congressional report entitled 'Federal Policies to Promote the Widespread Utilization of Photovoltaic Systems' are presented. Responses to the review comments by the Jet Propulsion Laboratory, preparer of the Congressional report, are also presented. The Congressional report discussed various issues related to promoting the deployment of photovoltaic systems through the Federal Photovoltaic Program. Various program strategies and funding levels were examined.

Smith, J. L.↗
NASA NTRS1979

NASA policy issues

U.S. remote sensing policy is discussed, with emphasis on problems associated with the development of operational systems. Certain economic and legislative aspects are examined.

Frosch, R. A.↗
NASA NTRS1981

International space policy and the interests of the United States and developing countries

The paper discusses principles which must be upheld in order to protect U.S. interests in space, the potential impact of the Moon Treaty on these principles, how to satisfy the legitimate needs of developing countries while protecting U.S. interests, and how to enhance the probability of success in future negotiations concerning space. It is suggested that, in order to preserve the rights of its citizens and industry to exploit space, the United States must make a strong effort to help solve the problems of the developing countries, maintain a strong space program, and develop and follow a space policy that reflects the interests of the American people.

Bon, B.↗
NASA NTRS1985

Orbital debris policy issues: Battelle involvement and some personal observations

The possible hazards presented by orbital debris have been a matter of concern since the early 1960s. The area of initial concern was the potential hazard of the Earth from reentering debris. In the very early days of the space program, it was believed that only specially protected objects would survive reentry. Subsequent events showed this to be incorrect. The recognition of the potential hazard of orbital debris to orbiting objects did not occur until the late 1970s. Concern over this potential hazard has increased, and has also given rise to a number of policy issues. These issues are, at present, largely unresolved.

Edgecombe, D. S.↗
NASA NTRS1986

Communications satellite business ventures - Measuring the impact of technology programmes and related policies

An economic evaluation and planning procedure which assesses the effects of various policies on fixed satellite business ventures is described. The procedure is based on a stochastic financial simulation model, the Domsat II, which evaluates spacecraft reliability, market performance, and cost uncertainties. The application of the Domsat II model to the assessment of NASA's ion thrusters for on-orbit propulsion and GaAs solar cell technology is discussed. The effects of insurance rates and the self-insurance option on the financial performance of communication satellite business ventures are investigated. The selection of a transportation system for placing the satellites into GEO is analyzed.

Greenberg, J. S.↗
NASA NTRS1987

Product assurance policies and procedures for flight dynamics software development

The product assurance policies and procedures necessary to support flight dynamics software development projects for Goddard Space Flight Center are presented. The quality assurance and configuration management methods and tools for each phase of the software development life cycles are described, from requirements analysis through acceptance testing; maintenance and operation are not addressed.

Perry, Sandra↗
NASA NTRS1986

Commercial space policy - Theory and practice

NASA policy toward commercial space ventures is summarized and illustrated with a proposed system for mobile communications through satellite links (MSAT). The government's, i.e., NASA's, role in commercial space ventures is to provide funding and expertise to high risk projects with prospective large returns, provided no vital public services are displaced. MSAT would be realized with a relay spacecraft in GEO, linking mobile radios costing in the range $500-2500. The experimental ATS-6 satellite would be the first generation relay. It is estimated that by the 1990s a spacecraft with a 20-55 m antenna could provide transmission relays for between 640,000 to about 2.5 million nonurban communications units.

Freibaum, Jerry↗
NASA NTRS1989

Safety policy and requirements for payloads using the space transportation system

The safety policy and requirements are established applicable to the Space Transportation System (STS) payloads and their ground support equipment (GSE). The requirements are intended to protect flight and ground personnel, the STS, other payloads, GSE, the general public, public-private property, and the environment from payload-related hazards. The technical and system safety requirements applicable to STS payloads (including payload-provided ground and flight supports systems) during ground and flight operations are contained.

Source record↗
NASA NTRS1991

Policy opportunities

Recommendations are given regarding National Science Foundation (NSF) astronomy programs and the NASA Space Astrophysics program. The role of ground based astronomy is reviewed. The role of National Optical Astronomy Observatories (NOAO) in ground-based night-time astronomical research is discussed. An enhanced Explored Program, costs and management of small and moderate space programs, the role of astrophysics within NASA's space exploration initiative, suborbital and airborne astronomical research, the problems of the Hubble Space Telescope, and astronomy education are discussed. Also covered are policy issues related to the role of science advisory committees, international cooperation and competition, archiving and distribution of astronomical data, and multi-wavelength observations of variable sources.

Mccray, Richard↗
NASA NTRS1990

NASA secondary payload plans, policies and requirements

A review is presented of the secondary or piggyback flight opportunities that are presently available along with an overview of NASA's secondary payload plans, policies and requirements. When there is excess capacity on either the Space Shuttle or an expendable launch vehicle (ELV), a logical step is to carry a secondary payload to provide a relatively low-cost launch for small satellites. NASA has already flown more than a dozen piggyback payloads on the Delta rocket. The Small Expendable Deployment system experiment is currently planned as the first of small space experiments launched as a piggyback on an ELV. Some details are provided on various secondary payload flight opportunities aboard the Space Shuttle including the Get-Away Special Canister Program, the complex autonomous payload, the Hitchhiker Program, and the middeck lockers concept. Also described are several secondary payload possibilities utilizing ELVs.

Poniatowski, Karen S.↗
NASA NTRS1991

A spacefaring nation - Perspectives on American space history and policy

The present volume on perspectives on American space history and policy discusses decision-making, space science and scientific communities, postwar aeronautical research in the federal laboratory, and civilian and military remote sensing and reconnaissance. Attention is given to the interpenetration of science, technology, and politics; space 'sociology'; and space technology and planetary science from 1950 to 1985. Other topics addressed include the aeronautics infrastructure as it applies to aeronautics history, the Lewis Research Center and its transition to space, the relationship between NASA and the users of earth resources data, and methodology for researching a classified system for space reconnaissance.

Collins, Martin J.↗
NASA NTRS1992

NASA/DOD Aerospace Knowledge Diffusion Research Project. Report 11: Chronology of selected literature, reports, policy instruments, and significant events affecting Federal Scientific and Technical Information (STI) in the United States

The chronology is a comprehensive bibliography. It contains 512 entries covering a variety of selected literature, reports, policy instruments, and significant events affecting Federal Scientific and Technical Information (STI) from 1945 to 1990. It includes some publications and events of historic interest which relate to the evaluation of aerospace and aerospace knowledge diffusion. Each entry has been given an item number and items are arranged by columns. To provide an overview of Federal STI developments, the entries are generally arranged by date of publication and event.

Pinelli, Thomas E.↗
NASA NTRS1991

Software Engineering Laboratory (SEL) data and information policy

The policies and overall procedures that are used in distributing and in making available products of the Software Engineering Laboratory (SEL) are discussed. The products include project data and measures, project source code, reports, and software tools.

Mcgarry, Frank↗
NASA NTRS1992

From a lunar outpost to Mars - Science, policy and the U.S. Space Exploration Initiative

The technological developments required for the Space Exploration Initiative (SEI) objectives are discussed in terms of scientific investigation and present U.S. space policy. The results of the 90-Day Study are listed which include explicit suggestions for the successful exploration of the moon and Mars. The Outreach/Synthesis program is described which provides four methods for eliciting ideas, technologies, and research venues for lunar and Martian missions. The results of the studies include 5 scientific objectives such as the relationship between the sun, planetary atmospheres, and climate. The protection of human life from potential extraterrestrial hazards such as radiation is also found to be a key objective of SEI as are the theoretical and practical issues of scientific research.

Pilcher, Carl B.↗