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tensioned Metastable Fluid Detectors in Nuclear Security for Active Interrogation of Special Nuclear Materials―Part B

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World Journal of Nuclear Science and Technology 2011年第3期1卷 66-76页

作者： Jeffrey A. Webster Rusi P. Taleyarkhan 不详

This paper (constituting Part B) addresses active interrogation for detecting Special Nuclear Materials (SN- Ms) and includes description of the transformational tensioned Metastable Fluid Detector (TMFD) based method for optimal monitoring. One of the greatest difficulties in detection of SNMs by active interrogation is the task of distinguishing between the probing particles and the secondary particles that indicate the presence of SNMs. The TMFD’s selective insensitivity and γ photon blindness features are advantageous for alleviating this problem. The working principle of the TMFD is discussed along with its applications for security. The experimental work to date involving detection of small quantities of uranium with conventional detectors is discussed along with results of fission neutron detection. Statistically significant detection was achieved within 5 minutes of counting to ascertain and measure conclusive evidence for the presence of a 55g sample of uranium containing 235U. Results of simulations of three active detection techniques utilizing a TMFD system are presented. The process for using the TMFD to discriminate active source particles using timing and energy are described. These simulations indicate that it should be possible to utilize the TMFD system for optimal neutron-based interrogation of SNMs.

关键词： tensioned Metastable Fluid Detector Active Interrogation TMFD SNM Detection

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Approach to Determine Corrosion Propensity in Post-tensioned Tendons with Deficient Grout

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Open Journal of Civil Engineering 2013年第3期3卷 182-187页

作者： Juan Carlos Rafols Kingsley Lau Ivan Lasa Mario Paredes Adel ElSafty CONCORR Florida Inc. Merritt Island USA Florida Department of Transportation Gainesville USA Florida International University Miami USA University of North Florida Jacksonville USA

After corrosion failure of post-tensioned tendons was identified in a Florida bridge in early 2011, laboratory tests were conducted in this study on extracted sections from the failed tendons to identify the grout properties and makeup leading to the failure and also to elucidate the mechanism of corrosion. The initial steps in identification of PT tendons with a high propensity for corrosion initiation or damaged included a detailed visual inspection and identification of voids in the grout. Voids in tendon can be a result of bleed water formation or construction problems. General characteristics of the deficient grout and corrosion behavior of steel in the affected bridge gave a first approach to assessing grout deficiency and corrosion susceptibility. However, refinements in the understanding of the mechanisms causing grout segregation and the elucidation of the role of sulfates, oxygen content, and pore water pH in corrosion development are required.

关键词： Post tensioned Grout Dissimilar Tendon Corrosion

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Tensegrities and tensioned Structures

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Journal of Architectural Environment & Structural Engineering Research 2020年第3期3卷 10-16页

作者： MªDolores Alvarez Elipe CEIPSO Salvador Dalí Spain

“Push-and-pull”efficient structures have been inconceivable between XVIII *** is because of the incapacity of obtain an efficient behaviour of tensioned *** XVIII centuries,architecture developed some structural knowledge generating novel structural forms in the architecture and engineering that were not known *** and tensioned structures were studied due to the knowledge of geometry and *** investigations about tensegrities and tensioned structures have been developed since that *** are bar and cable structures that work only in compression or tension *** and cables are balanced,but in appearance the growth is *** of deployable structures are based on tensegrity *** research is focused in presenting a summary of tensegrities and tensioned architectures that have been used in the structural design of novel *** research of adequate materials to tension efforts will be crucial in this *** investigation presents an important state of the art that provides technical solutions to apply on novel architectures based on tensegrities and tensioned *** research is useful to produce the current constructive solutions based on these constructive systems.

关键词： Tensegrity tensioned Geometry Structure Compression Tension Effort

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