Cumulative index to NASA Tech Briefs, 1963-1967

Cumulative index to NASA survey on technology utilization of aerospace research outpu

Cumulative index to NASA Tech Briefs, 1986-1990, volumes 10-14

Tech Briefs are short announcements of new technology derived from the R&D activities of the National Aeronautics and Space Administration. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This cumulative index of Tech Briefs contains abstracts and four indexes (subject, personal author, originating center, and Tech Brief number) and covers the period 1986 to 1990. The abstract section is organized by the following subject categories: electronic components and circuits, electronic systems, physical sciences, materials, computer programs, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences

A Mathematical Model To Simulate Small Boat Behaviour

The use of mathematical models and associated computer simulation is a well established technique for predicting the behaviour of large marine vessels. For a variety of reasons, mainly related to effects of scale, existing models are unable to adequately predict the manoeuvring characteristics of smaller vessels. The accuracy with which the performance of a boat under autopilot control can be predicted leaves much to be desired. The thesis provides a mathematical model to simulate small boat behaviour and so can assist with the design and testing of marine autopilots. The boat model is presented in six degrees-of-freedom, which, with suitable wave disturbance terms, allows motions such as broaching to be analysed. Instabilities in the performance of an autopilot arising from such sea induced yaw motions can be assessed with a view to improving the control algorithms and methodology. The traditional "regressional" style models used for large ships are not suitable for a small boat model since there exist numerous small boat types and diverse hull shapes. Instead, a modular approach has been adopted where individual forces and moments are categorised in separate sections of the model. This approach is still in its infancy in the field of marine simulation. The modular concept demands a clearer understanding of the physical hydrodynamic processes involved in the boat system, and the formulation of equations which do not rely solely upon approximations to, or multiple regression of, data from sea trials. Although many hydrodynamic coefficients have been introduced into the model, a multi-variable Taylor series expansion of the states about some equilibrium condition has been avoided, since this would infer an approximation to have been made, and the higher order terms rapidly become abstract in their nature and difficult to relate to the real world. The research rectifies the glaring omission of a small boat mathematical model, the framework of which could be expanded to encompass other marine vehicles. Additional forces and moments can be appended to the model in new modules, or existing modules modified to suit new applications. Much more work, covering a greater range and fidelity, is required in order to provide equations which accurately describe the true physical situation

Computer science: the hardware software and heart of IT

1st edition, 201

Terraces of the Tweed Valley

This study is concerned with an analysis of terrace forms in recently glacierised areas and in particular those existing in the Tweed Valley. It attempts to establish how significant terrace fragments are as records of geoaorphological evolution of an area, how easily they can be grouped and what has been the Late- and Post-Glacial history of the Tweed Valley. A review of some of the relevant literature on other, broadly comparable areas is followed by proposals for new definitions and a new classification of terrace fragments based on surface morphology and on downvalley gradient with cress valley height relationship respectively. The limits at which down and cross valley correlation can be carried out are discussed, along with the usual interpretations laid on the terrace sequences reported in the literature. A full discussion of both the possible and the employed means of mapping and heighting terrace fragments leads to the conclusion that, for the present purposes, only mapping on a scale of 1/10,560 and accurate levelling or tacheoraetric survey is suitable. As no recent account has summarised the geomorphological knowledge pertaining to the field area, the available literature has been summarised and added to in an analysis of the pre-terrace landscape elements, A detailed description of all of the mapped terrace fragments and associated fluvioglacial features is provided, arranged by splitting the Tweed Valley into three sub-areas. Virtually all of these terrace fragments were accurately heighted and the 11,000 resultant spot heights are reproduced in ap endix form and also on a series of vertical linear projection planes. The 'representative nature' of these results has been tested by taking a sample from the total number of fragments and statistically testing the variations in projected height and gradient possible by systematically excluding certain heights on a fragment. Correlation of individual fragments was carried out wherever possible, viewed in the light of distortions caused by the forms and distribution of the projection planes involved. A successful experiment involving the fitting of low order trend surfaces to individual fragments and the attempted correlation of these surfaces is reported. This employed spot heights in rectangular grid layouts on well-preserved fragments in the Fleurs Castle area. The value of steering these trend surfaces around valley meanders by changing the geographical coordinate system and the variation in trend surface form due to different point distribution patterns have also been investigated. The terrace sequence obtained for the whole valley is markedly different to those sequenoes often obtained in comparable areas, particularly in other parts of the British Isles. It consists essentially of several laterally-disparate suites of high gradient, ice-proximal outwash terraces, truncated at lower levels by low gradient ice-distant outwash terraces and Post-Glacial river terraces. The upstream extremities of the high gradient forms is believed to mark the approximate positions of still-stands or readvances of the downwasting ice mass formerly occupying the Tweed Valley

Orbital transfer vehicle concept definition and system analysis study. Volume 2: OTV concept definition and evaluation. Book 1: Mission and system requirements

The mission and system requirements for the concept definition and system analysis of the Orbital Transfer Vehicle (OTV) are established. The requirements set forth constitute the single authority for the selection, evaluation, and optimization of the technical performance and design of the OTV. This requirements document forms the basis for the Ground and Space Based OTV concept definition analyses and establishes the physical, functional, performance and design relationships to STS, Space Station, Orbital Maneuvering Vehicle (OMV), and payloads

Orbital transfer vehicle concept definition and system analysis study. Volume 2: OTV concept definition and evaluation. Book 3: Subsystem trade studies

The technical trade studies and analyses reported in this book represent the accumulated work of the technical staff for the contract period. The general disciplines covered are as follows: (1) Guidance, Navigation, and Control; (2) Avionics Hardware; (3) Aeroassist Technology; (4) Propulsion; (5) Structure and Materials; and (6) Thermal Control Technology. The objectives in each of these areas were to develop the latest data, information, and analyses in support of the vehicle design effort

Human Jurisprudence: Public Law as Political Science

This book provides a rare view of a creative scholar at work during a highly productive phase of his career. It shows him as an innovator, theorist, methodologist, “missionary,” critic, and scientist, but he remains, withal, in his fashion, a humanist. He believes that institutions and processes—particularly law, politics, and scholarship—are best understood in human terms. With Holmes, he believes that law is a prediction of what courts will do; hence, to understand law it is necessary to understand judicial behavior. A full explanation of a judge’s behavior would take into account his health (both physical and mental), his personality, his culture and society, and his ideology. Glendon Schubert concedes this but focuses primarily on ideology because he believes the other variables are sublimated in it. Therefore, to him, ideology—attitudes toward human values—is the basic explanation of judicial behavior, and jurisprudence is necessarily human. The studies in this volume are important in the study of judicial behavior, for they broke new ground, and some were forerunners of major books, such as The Judicial Mind, which was published in 1965. Each shows Professor Schubert’s concern at the time they were written, and taken together they show the movement and growth of his ideas and interests

List of Bureau of Mines publications and articles, January 1, 1965, to December 31, 1969, with subject and author index

"This compilation supplements the 50-year list of Bureau publications issued from July 1, 1910, to January 1, 1960; the 50-year list of articles by Bureau authors published outside the Bureau from July 1, 1910, to January 1, 1960; and the 5-year list of Bureau publications and articles published from January 1, 1960, to December 31, 1964. It includes all the material in the four annual lists of Bureau publications and articles for January 1, 1965, to December 31, 1968, as well as the Bureau publications and articles for 1969. More than 2,500 publications by Bureau authors published in the regular Bureau of Mines series, in scientific, technical, or trade journals, or in other media are listed and summarized; those available from the Bureau of Mines are indicated. Libraries which maintain files of Bureau publications are listed. Cooperative publications issued by organizations with which the Bureau conducted joint research are described. Patents issued to Bureau personnel are also listed, and instructions are given on how to apply for permission to use them. One of the outstanding features of this special publication is an exhaustive subject and author index." - NIOSHTIC-2NIOSHTIC no. 1000888719701171