A theoretical and an experimental study of the electromagnetic scattering from a perfectly conducting thin wire of V shape illuminated by a plane wave at an arbitrary incidence is presented. The distribution of curren...
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A theoretical and an experimental study of the electromagnetic scattering from a perfectly conducting thin wire of V shape illuminated by a plane wave at an arbitrary incidence is presented. The distribution of current on the wire is first determined by a method of moments with the aid of a computer program WIRANT (developed by Walter L. Curtis of The Boeing Company). The scattered field and backscattering cross section are then obtained by standard techniques. Numerical calculations include the backscattering cross sections for the case of h = \lambda/2 and \lambda (where h is arm length and \lambda is wavelength) as a function of incidence angle \phi with enclosed angle \theta as a parameter. To check the accuracy of the theory, an experiment is conducted inside an anechoic chamber, using the conventional method of cancellation. The frequency used in the experiment is 9.8 GHz. A number of experimental models were constructed of a copper wire of a circular cross section with a diameter d = 0.025". The agreement between theory and experiment is, in general, very good. The results of this investigation provide an insight into the coupling effect between the halves of wire when viewed as two-coupled wires.
作者：
GRANET, IRVINGGUMAN, WILLIAMMCILROY, WILLIAMIrving Granet received his B.M.E. from The Cooper Unionhis M.M.E. from Polytechnic Institute of Brooklynhas taken Pre-Doctoral Studies at Polytechnic Institute of Brooklynand is a graduate of the Oak Ridge School of Reactor Technology.He has worked in Republic's Plasma Propulsion Laboratory on nuclear propulsion systems
space radiators thermodynamic power cycle considerations for generating electric power and system design and operation for space propulsion. He was formerly Director of Staff Engineering Nuclear Energy Department of Foster Wheeler Corporation where he directed engineering design and analysis for complete nuclear plants. Mr. Granet has taught thermodynamics and heat transfer at the Polytechnic Institute of Brooklyn and at present is Adjunct Assistant Professor of Engineering and Physics at Long Island University. He has published over 40 articles in the fields of thermodynamics
applied mechanics heat transfer and nuclear energy. He is a member of the American Society of Mechanical Engineers National Society of Professional Engineers Pi Tau Sigma and Sigma Xi. He is a licensed Professional Engineer in the State of New York. Mr. Granet is listed in the 1960 edition of American Men of Science and is a reviewer for the American Chemical Society's technical publications. William J. Guman received degrees of B. Aero. E.
M. Aero. E. from and has completed courses for Ph.D. Aero. E. at Rensselaer Polytechnic Institute. Since coming to Republic in 1959 Mr. Guman has been conducting theoretical and experimental studies on non-steady interactions and flow processes in plasma engine configurations. Mr. Guman was Assistant Professor at Rensselaer Polytechnic Institute lecturing on fluid mechanics aerodynamics performance and stability and conducting laboratory courses in experimental fluid dynamics and wind tunnel research. He also investigated flow induction and was head of Rensselaer's supersonic wind tunnel laboratory. Mr. Guman performed a theoretical analysis in experimental aerodynamic
作者：
KINNEY, ETCONSTANT, AEdward T. Kinney
a native of Grand Rapids Michigan earned his Bachelor of Science degree with honors in Civil Engineering from Michigan State University in 1952. He began his career with the Bureau of Ships as a Naval Architect in the Hull Design Training Program in September 1952. Kinney has served as a Project Coordinator in the Machinery Systems Division and is currently Head of the Environmental Pollution Control Branch at the Naval Ship Engineering Center. He is a member of several committees including the Department of Defense Environmental Pollution Control Committee and the Interagency Committee on Vessel Pollution Standards. Alexander Constant graduated from Pennsylvania Military College in June 1960 with a B.S. in Civil Engineering. After two years with the U.S. Forest Services working as a Civil Sanitary Engineer designing recreational facilities
Constant joined the Vermont Water Resources Department as a Project Engineer. For the past five years he has been associated with the Naval Ship Engineering Center Piping System Branch responsible for design and development of systems and equipment to abate and control shipboard generated waste. He is presently Acting Head of the Sewage and Waste Water Section of the Environmental Pollution Control Branch NavSec.
The Navy, as well as other Federal Agencies and the private sector, has a clear mandate to stop polluting the environment, Various sources of environmental pollution caused by the operation of naval ships are discusse...
The Navy, as well as other Federal Agencies and the private sector, has a clear mandate to stop polluting the environment, Various sources of environmental pollution caused by the operation of naval ships are discussed and characterized by the following general categories: Sewage; Oil; Industrial; Combustion Products; and Other Mission Related Wastes. Existing procedures for controlling these pollutants and advanced concepts for more complete control are discussed. Currently a very small percentage of ships are equipped to control environmental pollution. Complete control of ship wastes will be very costly and technically challenging. The first steps to effect control have been taken but greater strides are required.
The conventional solution for the optimal control of a linear-stationary regulator with quadratic performance index and fixed terminal time leads to a linear control law with time-varying gain coefficients [1]. In add...
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The conventional solution for the optimal control of a linear-stationary regulator with quadratic performance index and fixed terminal time leads to a linear control law with time-varying gain coefficients [1]. In addition to the usual disadvantages of time-variable controllers, some of the time-varying gain coefficients approach infinity as the specified terminal time is approached. In the present paper, it is shown that the optimal control for the above problem can be expressed in the form of a time-invariant non-linear control law. Certain parameters in the nonlinear control law are functions of the initial time and initial state of the system. The conventional time-varying linear control law can be obtained directly from the time-invariant nonlinear control law. The results of the present paper are applicable to a more general class of optimal control problems involving linear and nonlinear systems. Two examples are given to illustrate the method.
作者：
DANGEL, RTHE AUTHOR:was born in New York City in 1933
he received his Bachelor's degree from the school of Industrial Management of the Massachusetts Institute of Technology in 1955. He has also completed all course work for a masters in Engineering Administration at George Washington University. Since graduation he has spent 11 years in private industry with companies in the DOD engineering research and development area. His last position before coming to the Navy in 1966 was with the Washington Technological Associates in Rockville Md. as a Program Manager responsible for engineering development of training weapons weapon handling equipment and logistic policy. This position involved engineering direction of project engineers and department managers budget control and work authorization negotiation and contract administration. Since joining the Navy in August 1966 he worked as an engineer in the Talos/Terrier weapons installations branch for approximately 6 months. He then joined the LHA Project as an Assurance Engineer on the staff of the Project Manager responsible for the development of requirements contractor direction and monitoring of the Reliability Maintainability System Safety Engineering Value Engineering and Quality Assurance Programs throughout the LHA's contract definition phase. In October of 1968 he became head of the Integrated Logistic Support system development section of the Technical Concepts Office. In this capacity he has been responsible for implementing integrated logistic support planning policy and procedures in NAVSHIPS.
TheAsiaInformationRetrievalSymposium(AIRS)wasestablishedbytheAsian information retrieval community after the successful series of Information - trieval with Asian Languages (IRAL) workshops held in six di?erent locati...
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ISBN:
(数字)9783540318712
ISBN:
(纸本)9783540250654
TheAsiaInformationRetrievalSymposium(AIRS)wasestablishedbytheAsian information retrieval community after the successful series of Information - trieval with Asian Languages (IRAL) workshops held in six di?erent locations in Asia, starting from 1996. While the IRAL workshops had their focus on inf- mation retrieval problems involving Asian languages, AIRS covers a wider scope of applications, systems, technologies and theory aspects of information retrieval in text, audio, image, video and multimedia data. This extension of the scope re?ects and fosters increasing research activities in information retrieval in this region and the growing need for collaborations across subdisciplines. We are very pleased to report that we saw a sharp increase in the number of submissions and their quality, compared to the IRAL workshops. We received 106papersfromninecountriesinAsiaandNorthAmerica,fromwhich28papers (26%) were presented in oral sessions and 38 papers in poster sessions (36%). It was a great challenge for the Program Committee to select the best among the excellent papers. The low acceptance rates witness the success of this year’s conference. After a long discussion between the AIRS 2004 Steering Committee and Springer, the publisher agreed to publish our proceedings in the Lecture Notes in Computer Science (LNCS) series, which is SCI-indexed. We feel that this strongly attests to the excellent quality of the papers.
The interest in climbing and walking robots (CLAWAR) has intensified in recent years, and novel solutions for complex and very diverse applications have been anticipated by means of significant progress in this area o...
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ISBN:
(数字)9783540264156
ISBN:
(纸本)9783540264132;9783662500408
The interest in climbing and walking robots (CLAWAR) has intensified in recent years, and novel solutions for complex and very diverse applications have been anticipated by means of significant progress in this area of - botics. Moreover, the amalgamation of original ideas and related inno- tions, search for new potential applications and the use of state of the art support technologies permit to foresee an important step forward and a significant socio-economic impact of advanced robot technology in the - ture. This is leading to the creation and consolidation of a mobile service robotics sector where most of the robotics activities are foreseen in the - ture. The technology is now maturing to become of real benefit to society and methods of realizing this potential quickly are being eagerly explored. Robot standards and modularity are key to this and form key components of the research presented here. CLAWAR 2005 is the eighth in a series of international conferences - ganised annually since 1998 with the aim to report on latest research and development findings and to provide a forum for scientific discussion and debate within the mobile service robotics community. The series has grown in its popularity significantly over the years, and has attracted - searchers and developers from across the globe. The CLAWAR 2005 p- ceedings reports state of the art scientific and developmental findings p- sented during the CLAWAR 2005 conference in 131 technical presentations by authors from 27 countries covering the five continents.
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