Damping capacity of materials, volume I

Damping capacity in materials - annotated bibliograph

Ultrasound propagation and binding in solids

Measurement of sound wave velocity and attenuation by the ultrasonic pulse-echo technique are used to obtain insight into the nature of weak interatomic binding forces which are present or develop in certain materials. In particular, anomalies are found in both the elastic and anelastic properties in the vicinity of the martensitic phase transformations which occur in TiNi andIndium-thallium alloys. Considerable differences found between the elastic moduli of the two phases of TiNi are shown to arise Mainly from a variation in the free carrier density. Previously reported elastic constant data of some fcc indium-thallium alloysAre complemented by the present results and an overall picture of the compositional dependence of the elastic properties of theseAlloys in both the tetragonal and cubic phases are provided. Zirconia can be forced into a cubic structure by the addition of more than 7 mole % yttria: elastic constant data of two zirconia-yttria solid solutions, technologically important materials, provides a basis for the discussion of the stability of the cubic phase. Finally, on the basis of an evaluation of the elastic moduliof arsenic, a pronounced layer-type crystal, the ultrasonic wave propagation characteristics in this material are extensively compared and contrasted with those of the other two rhombohedral elemental semimetals antimony and bismuth, neither of which are themselves layer-like. The elastic wave propagation in antimony and bismuth is shown to differ not only in degree but also in kind from that in arsenic which exhibits the characteristics expected for a layer-like crystal. The weak binding forces in each of the materials studied are shown to play a dominant role in their elastic behaviour

NASA thesaurus. Volume 1: Hierarchical Listing

There are over 17,000 postable terms and nearly 4,000 nonpostable terms approved for use in the NASA scientific and technical information system in the Hierarchical Listing of the NASA Thesaurus. The generic structure is presented for many terms. The broader term and narrower term relationships are shown in an indented fashion that illustrates the generic structure better than the more widely used BT and NT listings. Related terms are generously applied, thus enhancing the usefulness of the Hierarchical Listing. Greater access to the Hierarchical Listing may be achieved with the collateral use of Volume 2 - Access Vocabulary and Volume 3 - Definitions

NASA Thesaurus. Volume 1: Hierarchical listing

There are 16,713 postable terms and 3,716 nonpostable terms approved for use in the NASA scientific and technical information system in the Hierarchical Listing of the NASA Thesaurus. The generic structure is presented for many terms. The broader term and narrower term relationships are shown in an indented fashion that illustrates the generic structure better than the more widely used BT and NT listings. Related terms are generously applied, thus enhancing the usefulness of the Hierarchical Listing. Greater access to the Hierarchical Listing may be achieved with the collateral use of Volume 2 - Access Vocabulary

NASA thesaurus. Volume 2: Access vocabulary

The access vocabulary, which is essentially a permuted index, provides access to any word or number in authorized postable and nonpostable terms. Additional entries include postable and nonpostable terms, other word entries and pseudo-multiword terms that are permutations of words that contain words within words. The access vocabulary contains almost 42,000 entries that give increased access to the hierarchies in Volume 1 - Hierarchical Listing

NASA multidisciplinary research grant

Research is discussed in the multidisciplinary areas of space and planetary science; materials and radiation; systems, instrumentation, and structures; and technology and man. Highlights are identified as an alpha-recoil track method of archeological dating; infrared astronomical telescope; reaction rates data, semiconductor radiation detectors, and analysis of time-dependent systems; Gunn effect devices for microwave generation and detection, mode-locked lasers, and radiation theory; and the application of a satellite communication system to educational development. Detectors to be flown on Apollo 16 to measure heavy particle flux in the solar wind and to be part of the HEAO-A experiment on extremely heavy nuclei in cosmic rays were developed. The impact of the multidisciplinary research on university activities is described, and individual departmental reports are included

NASA thesaurus. Volume 2: Access vocabulary

The Access Vocabulary, which is essentially a permuted index, provides access to any word or number in authorized postable and nonpostable terms. Additional entries include postable and nonpostable terms, other word entries, and pseudo-multiword terms that are permutations of words that contain words within words. The Access Vocabulary contains 40,738 entries that give increased access to the hierarchies in Volume 1 - Hierarchical Listing

Research in materials, science and engineering Annual report 1965-1966

Research projects in materials engineering and science, and solid state, plasma, and low temperature physic