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Editorial - belling the cat, revisited

IEEE Transactions on Reliability 2002年第1期51卷 2-2页

作者： R.A. Evans Technology (Huazhong University of Science and Technology) State Key Laboratory of Advanced Electromagnetic Engineering Wuhan Hubei Province P. R. China

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Experimental and theoretical analyses on laser-generated transient Lamb waves in an orthotropic plate

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AIP Conference Proceedings 2000年第1期509卷 1151-1158页

作者： J. C. Cheng S. Y. Zhang Y. Berthelot 1State Key Laboratory of Modern Acoustics and Institute of Acoustics Nanjing University Nanjing 210093 People’s Republic of China 2School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia 30332-0405

The technique of laser-generated and laser-detected Lamb waves is a powerful tool for characterizing elastic property of plates. However, the transient waveforms depend strongly on the longitudinal acoustic wavelength L and the plate thickness H. For a thick plate (bulk material), L/H≪1, a typical waveform consists of arrivals of longitudinal, shear, and surface wave pulses, if a detecting position is localized at the same side as the exciting laser beam. For a very thin plate L/H≫1, the transient waveform is characterized by the lowest Lamb wave modes, i.e., the first arrival of the spike signal from the lowest symmetric mode, and higher frequencies and the later lower frequency signal of the lowest antisymmetric mode. However, for thicker plates (H∼2.0 mm), the transient waveforms excited by a laser pulse are much more complicated, because of contributions of the higher-order Lamb wave modes, due to lower cut-off frequency. Thus, it is necessary to clarify theoretically dynamic response of the thicker composite plates for analyzing anisotropic behavior and extracting elastic constants of composite plates by fitting comparison of theory with experimental waveforms. In this paper, the theoretical and experimental studies are presented for a titanium graphite composite plate with thickness 1.44 mm, which can be modeled as transversely isotropic. The ultrasonic Lamb waves are excited by a laser pulse with an approximate duration of 10 nsec and energy of 5.7 mJ. The normal surface velocity of the ultrasonic Lamb waves are detected by a Michelson interferometer in fiber and cross fiber propagating directions for different propagating distances away from the excited laser to investigate the anisotropic property of the composite material and propagation characteristics of the ultrasonic Lamb waves. The results show that the detected waveforms consist of several Lamb wave modes and the theoretical calculations are in agreement with experiments.

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Contributory presentations/posters

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Journal of Biosciences 1999年第1期24卷 33-198页

作者： N. Manoj V. R. Srinivas A. Surolia M. Vijayan K. Suguna R. Ravishankar R. Schwarzenbacher K. Zeth Diederichs G. M. Kostner A. Gries P. Laggner R. Prassl Madhusudan Pearl Akamine Nguyen-huu Xuong Susan S. Taylor M. Bidva Sagar K. Saikrishnan S. Roy K. Purnapatre P. Handa U. Varshney B. K. Biswal N. Sukumar J. K. Mohana Rao A. Johnson Vasantha Pattabhi S. Sri Krishna Mira Sastri H. S. Savithri M. R. N. Murthy Bindu Pillai Kannan M. V. Hosur Mukesh Kumar Swati Patwardhan K. K. Kannan B. Padmanabhaa S. Sasaki-Sugio M. Nukaga T. Matsuzaki S. Karthikevan S. Sharma A. K. Sharma M. Paramasivam P. Kumar J. A. Khan S. Yadav A. Srinivasan T. P. Singh S. Gourinath Neelima Alam A. Srintvasan Vikas Chandra Punit Kaur Ch. Betzel S. Ghosh A. K. Bera S. Bhattacharya S. Chakraborty A. K. Pal B. P. Mukhopadhyay I. Dey U. Haldar Asok Baneriee Jozef Sevcik Adriana Solovicova K. Sekar M. Sundaralingam N. Genov Dong-cai Liang Tao Jiang Ji-ping Zhang Wen-rui Chang Wolfgang Jahnke Marcel Blommers S. C. Panchal R. V. Hosur Bindu Pillay Puniti Mathur S. Srivatsun Ratan Mani Joshi N. R. Jaganathan V. S. Chauhan H. S. Atreya S. C. Sahu K. V. R. Chary Girjesh Govil Elisabeth Adjadj Éric Quinjou Nadia Izadi-Pruneyre Yves Blouquit Joël Mispelter Bernadette Heyd Guilhem Lerat Philippe Milnard Michel Desmadreil Y. Lin B. D. Nageswara Rao Vidva Raghunathan Mei H. Chau Prashant Pesais Sudha Srivastava Evans Coutinho Anil Saran Leizl F. Sapico Jayson Gesme Herbert Lijima Raymond Paxton Thamarapu Srikrishnan C. R. Grace G. Nagenagowda A. M. Lynn Sudha M. Cowsik Sarata C. Sahu S. Chauhan A. Bhattacharya G. Govil Anil Kumar Maurizio Pellecchia Erik R. P. Zuiderweg Keiichi Kawano Tomoyasu Aizawa Naoki Fujitani Yoichi Hayakawa Atsushi Ohnishi Tadayasu Ohkubo Yasuhiro Kumaki Kunio Hikichi Katsutoshi Nitta V. Rani Parvathy R. M. Kini Takumi Koshiba Yoshihiro Kobashigawa Min Yao Makoto Demura Astushi Nakagawa Isao Tanaka Kunihiro Kuwajima Jens Linge Seán O. Donoghue Michael Nilges G. Chakshusmathi Girish S. Ratnaparkhi P. K. Madhu R. Varadarajan C. Tetreau Molecular Biophysics Unit Indian Institute of Science Bangalore India Austrian Academy of Sciences Institute of Biophysics and X-ray Structure Research Graz Austria Faculty of Biology University of Konstanz Germany Institute of Medical Biochemistry University of Graz Austria Howard Huges Medical Institute Department of Chemistry & Biochemistry University of California La Jolla USA Department of Chemistry & Biochemistry University of California San Diego La Jolla USA Molecular Biophysics Unit India Department of Microbiology &Cell Biology Indian Institute of Science Bangalore India Macromolecular Structure Laboratory NCI - Frederick Cancer Research and Development Center ABL - Basic Research Program Frederick USA Department of Crystallography and Biophysics University of Madras Chennai Biochemistry Department Indian Institute of Science Bangalore India Condensed Matter Physics Division B.A.R.C. Trombay Mumbai Condensed Matter Physics Division Bhabha Atomic Research Centre Trombay Mumbai IMCB The University of Tokyo Tokyo Japan Mitsubishi Chemical Corporation Yokohama Research Center Yokohama Japan Faculty of Pharmaceutical Sciences Chiba University Chiba Japan Department of Biophysics All India Institute of Medical Sciences New Delhi India Department of Biophysics All India Institute of Medical sciences New Delhi India Institüt Physiologische Chemie Hamburg Germany Biophysics Department Bose Institute Calcutta India Slovak Academy of Sciences Institute of Molecular Biology Bratislava Slovakia Indian Institute of Science Bioinformatics Centre Bangalore Departments of Chemistry and Biochemistry Biological Macromolecular Structure Center USA Bulgarian Academy of Sciences Institute of Organic Chemistry Sofia Bulgaria Chinese Academy of Sciences Institute of Biophysics Beijing China Novartis Pharma AG Preclinical Research Basel Switzerland Department of Chemical Sciences Tata Institute of Fundamental Research Mumbai India Solid State Physics Div

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CHANNEL ACCESS PROTOCOLS FOR KU-BAND VSAT NETWORKS - A COMPARATIVE-EVALUATION

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IEEE COMMUNICATIONS MAGAZINE 1988年第5期26卷 34-44页

作者： RAYCHAUDHURI, D JOSEPH, K State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The performance of candidate protocols for first-generation Ku-band very small aperture terminal (VSAT) satellite networks is compared. The goal is to assist the process of selecting a protocol. The performance comparison is carried out over a range of possible traffic, channel and satellite parameters, leading to an understanding of the appropriate regime for each of the protocols under consideration. The protocols considered are unslotted Aloha, slotted Aloha, selective-reject (SRE) Aloha, and demand-assigned time-division multiple-access (TDMA) or DAMA.< >

关键词： Access protocols Satellite broadcasting Costs Satellite ground stations Artificial satellites Time division multiplexing Local area networks Apertures Wide area networks Power generation economics

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A TECHNIQUE FOR DETECTING RESONANCE

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 1988年第2期37卷 326-326页

作者： LAFFERTY, RE State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The dip-meter for detecting resonance in L-C circuits and transmission lines has all but disappeared. For those who occasionally have need to explore resonant conditions, the author has found a suitable substitute in a wideband signal generator and a sensitive RF millivoltmeter. Measurements have been made from low radio frequencies to over 2 GHz.

关键词： radiofrequency broadband signal Power cables RESONANCE Writers Generator Substitute Electric circuits Transmission Lines dynamos

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Viruses in Marine Invertebrate Holobionts: Complex Interactions Between Phages and Bacterial Symbionts

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Marine Science 1000年第1期16卷 467-485页

作者： Kun Zhou Ting Zhang Xiao-Wei Chen Ying Xu Rui Zhang Pei-Yuan Qian 2Department of Ocean Science Hong Kong University of Science and Technology Hong Kong China 1Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) Guangzhou China email: boqianpy@ust.hk 3State Key Laboratory of Marine Environmental Science College of Ocean and Earth Sciences Institute of Marine Microbes and Ecospheres Xiamen University (Xiang'an) Xiamen Fujian China 4Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science College of Life Sciences and Oceanography Shenzhen University Shenzhen China email: boxuying@*** 5Institute for Advanced Study Shenzhen University Shenzhen China email: ruizhang@***

Marine invertebrates are ecologically and economically important and have formed holobionts by evolving symbiotic relationships with cellular and acellular microorganisms that reside in and on their tissues. In recent decades, significant focus on symbiotic cellular microorganisms has led to the discovery of various functions and a considerable expansion of our knowledge of holobiont functions. Despite this progress, our understanding of symbiotic acellular microorganisms remains insufficient, impeding our ability to achieve a comprehensive understanding of marine holobionts. In this review, we highlight the abundant viruses, with a particular emphasis on bacteriophages; provide an overview of their diversity, especially in extensively studied sponges and corals; and examine their potential life cycles. In addition, we discuss potential phage–holobiont interactions of various invertebrates, including participating in initial bacterial colonization, maintaining symbiotic relationships, and causing or exacerbating the diseases of marine invertebrates. Despite the importance of this subject, knowledge of how viruses contribute to marine invertebrate organisms remains limited. Advancements in technology and greater attention to viruses will enhance our understanding of marine invertebrate holobionts.

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Groundwater Quality and Public Health

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Environment and Resources 1000年第1期48卷 395-418页

作者： Xianjun Xie Jianbo Shi Kunfu Pi Yamin Deng Bing Yan Lei Tong Linlin Yao Yiran Dong Junxia Li Liyuan Ma Chunmiao Zheng Guibin Jiang 2State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Wuhan China 1State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution School of Environmental Studies China University of Geosciences Wuhan China 3State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing China email: gbjiang@*** 4State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China

Groundwater deterioration due to enrichment with contaminants of either geogenic or anthropogenic origin has adversely affected safe water supply for drinking and irrigation, with pervasive impacts on human health and ecosystem functions. However, the spatiotemporal evolution and public health effects of groundwater quality remain unclarified, posing a grand challenge for the safe and sustainable supply of global groundwater resources. This article provides a state-of-the-art review of the complexity and dynamics of groundwater quality, as well as the impacts of various groundwater substances on human health. In particular, knowledge is growing about the health impacts of key substances ranging from nutritional elements (e.g., Ca2+, Mg2+) to pollutants (e.g., heavy metals/metalloids, persistent organic pollutants, and emerging contaminants) and, further, to pathogenic microorganisms to which the human body can be exposed through multiple patterns of groundwater use. Proliferating concerns at the same time call for enhancing science-based governance directives, economic policies, and management strategies coordinating groundwater quality. We propose that safeguarding groundwater-dependent public health needs concerted efforts in source control, cross-scale rehabilitation, and social hydrology-based groundwater governance.

关键词： groundwater quality geogenic contaminants emerging contaminants key substances human health sustainable groundwater management

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Space-Time Correlations and Dynamic Coupling in Turbulent Flows

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Fluid Mechanics 1000年第1期49卷 51-70页

作者： Guowei He Guodong Jin Yue Yang 1State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China email: hgw@*** 2State Key Laboratory of Turbulence and Complex Systems and Center for Applied Physics and Technology College of Engineering Peking University Beijing 100871 China

Space-time correlation is a staple method for investigating the dynamic coupling of spatial and temporal scales of motion in turbulent flows. In this article, we review the space-time correlation models in both the Eulerian and Lagrangian frames of reference, which include the random sweeping and local straining models for isotropic and homogeneous turbulence, Taylor's frozen-flow model and the elliptic approximation model for turbulent shear flows, and the linear-wave propagation model and swept-wave model for compressible turbulence. We then focus on how space-time correlations are used to develop time-accurate turbulence models for the large-eddy simulation of turbulence-generated noise and particle-laden turbulence. We briefly discuss their applications to two-point closures for Kolmogorov's universal scaling of energy spectra and to the reconstruction of space-time energy spectra from a subset of spatial and temporal signals in experimental measurements. Finally, we summarize the current understanding of space-time correlations and conclude with future issues for the field.

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