2,526 research outputs found
Guidebook of nondestructive evaluation techniques for materials and structures
Seventy nondestructive techniques for evaluating material and structures are described in guidebook. Standardized format facilitates comparison of their merits and limitations for solving various problems. Guide includes index of flaw types and tabulated guide to use of nondestructive evaluation techniques. Alternative technique names are cross-referenced
Capillary radiator Patent
Capillary radiator for carrying heat transfer liquid in planetary spacecraft structure
Radiant heater having formed filaments Patent
Refractory filament series circuitry for radiant heate
Thermionic converter with current augmented by self induced magnetic field Patent
Thermionic converter for converting heat energy directly into electrical energ
Cyclic switch Patent
High dc switch for causing abrupt, cyclic, decreases of current to operate under zero or varying gravity condition
Video enhancement of X-ray and neutron radiographs
System was devised for displaying radiographs on television screen and enhancing fine detail in picture. System uses analog-computer circuits to process television signal from low-noise television camera. Enhanced images are displayed in black and white and can be controlled to vary degree of enhancement and magnification of details in either radiographic transparencies or opaque photographs
High temperature heat source Patent
High temperature source of thermal radiatio
Minimizing Effective Many-Body Interactions
A simple two-level model is developed and used to test the properties of
effective interactions for performing nuclear structure calculations in
truncated model spaces. It is shown that the effective many-body interactions
sensitively depend on the choice of the single-particle basis and they appear
to be minimized when a self- consistent Hartree-Fock basis is used.Comment: (15 pages of text and 1 postscript figure (Figure available upon
request), Preprint Number not assigned ye
A review of issues and strategies in nondestructive evaluation of fiber reinforced structural composites
Techniques for quantitative assessment of the mechanical strength and integrity of fiber composites during manufacture and service and following repair operations are presented. Problems and approaches are discussed relative to acceptance criteria, calibrating standards, and methods for nondestructive evaluation of composites in strength-critical applications. Acousto-ultrasonic techniques provide the methods of choice in this area
Quantitative ultrasonic evaluation of engineering properties in metals, composites and ceramics
Ultrasonic technology from the perspective of nondestructive evaluation approaches to material strength prediction and property verification is reviewed. Emergent advanced technology involving quantitative ultrasonic techniques for materials characterization is described. Ultrasonic methods are particularly useful in this area because they involve mechanical elastic waves that are strongly modulated by the same morphological factors that govern mechanical strength and dynamic failure processes. It is emphasized that the technology is in its infancy and that much effort is still required before all the available techniques can be transferred from laboratory to industrial environments
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