In China, there are massive scenic spots located in mountain areas where debris flow of small watershed, landslide, collapse ,and other disasters are well *** debris flow disaster does not only harm the quality of the...
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In China, there are massive scenic spots located in mountain areas where debris flow of small watershed, landslide, collapse ,and other disasters are well *** debris flow disaster does not only harm the quality of the...
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In China, there are massive scenic spots located in mountain areas where debris flow of small watershed, landslide, collapse ,and other disasters are well *** debris flow disaster does not only harm the quality of the downstream scenic landscape resources, but also threaten the visitors' life safety. This paper analyzed the features of debris flow disaster in the Tianchi Lake Nature Reserve in *** on the previous study of debris flow prevention and control pattern, and the concept of river ecological landscape remediation, this paper scientifically proposed the ecological landscape remediation countermeasures through comprehensively utilization of geological disaster ruined landscape resources, in order to protect natural ecological landscape in the scenic debris flow area. In the disaster area, the method of engineering protection is taken to control debris flow, and in the downstream area the integrated prevention and control pattern are taken, which is combining artificial landscape intervention with natural landscape coordination, in order to reach the aim of the remediation of debris flow disaster in scenic spot and an effective integration of scenic resources in the spots.
作者：
Joshi, CHLindberg, JFClark, AEDr. Chad H. Joshi:is president of Energen
Incorporated an engineering and development firm specializing in cryogenic and electromechanical systems. The research presented here was conducted while he was employed at American Superconductor Coporation where he held both technical and program management positions. While there Dr. Joshi managed the development of several demonstration products including the sonar transducer presented here. He holds M.S. and Sc.D. degreesfrom the Massachusetts Institute of Technology and a B.S. degree from the Worcester Polytechnic Institute. He has worked in several diverse fields including solar energy fluidized bed technology and superconductivity. His work on stochastic analysis of solar insolation was recognized by the ASME and his doctoral research was accorded international recognition for its unique contribution to understanding quenching in superconducting magnets. Dr. Joshi has numerous patents and more than thirty-five technical publications to his credit. He is a registered Professional Engineer in Massachusetts and an active member of ASME and IEEE. He is a co-founder and treasurer of the New England Chapter of the Cryogenics Society of America. He will be listed in Whos Who in the East in 1997. Jan Lindberg:is a physicist in the Transducers and Arrays Division of the Naval Undersea Warfare Center in New London
Connecticut. He leads NUWC'S exploratory development efforts for transduction science and currently is spearheading an effort to introduce high-energy density active materials into tactical sonar systems. With the discovery of high temperature superconductivity he saw the potential benefit of integrating several emerging technologies and enticed American Superconductor Corp. to develop a high temperature superconducting transducer which resulted in the March 1993 demonstration of the world's first integrated high temperature superconducting device. Mr. Lindberg's current interests involve design of high power ultrasonic copolymer arrays characterization of
A low-frequency underwater acoustic transducer integrating high-temperature superconducting (HTS) coils and terbium-dysprosium (TbDy) magnetostrictive material was designed, fabricated and tested. This represents a no...
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A low-frequency underwater acoustic transducer integrating high-temperature superconducting (HTS) coils and terbium-dysprosium (TbDy) magnetostrictive material was designed, fabricated and tested. This represents a novel application for high-temperature superconductivity and is a first example of an integrated system involving HTS coils cooled by a mechanical cryocooler. It also brings HTS technology together with a novel magnetic materials technology. The I-ITS coils were fabricated using react-and-wind BiSrCaCuO-2223 HTS wires. They produce a peak field of 0.1 Tesla at 50 K. A single-stage, Stirling-cycle cryocooler was used to cool the coils and the TbDy driver to cryogenic temperatures (50-65K). The coils provide an AC magnetic field superimposed on a DC bias field, which produces oscillatory strain within the magnetostrictive rod;this motion is transmitted through a cryostat to two head masses which project sound into the surrounding environment. High power acoustic output can be obtained by operating the transducer at its resonance frequencies of 520 Hz in air and 430 Hz underwater. This development demonstrates that, unlike low temperature superconductors, HTS wires can be considered for AC applications due to the low losses in these superconductors and the higher heat capacities of materials at temperatures above liquid helium.
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