Results 1 - 10 of 87645
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[en] Fuel Safety Research Specialists' Meeting, which was organized by Japan Atomic Energy Research Institute, was held on March 4-5, 2002 at JAERI in Tokai Establishment. Purposes of the Meeting are to exchange information and views on LWR fuel safety topics among the specialist participants from domestic and foreign organizations, and to discuss the recent and future fuel research activities in JAERI. In the Meeting, presentations were given and discussions were made on general report of fuel safety research activities, fuel behaviors in normal operation and accident conditions, FP release behaviors in severe accident conditions, and JAERI's ''Advanced LWR Fuel Performance and Safety Research Program''. A poster exhibition was also carried out. The Meeting significantly contributed to planning future program and cooperation in fuel research. This proceeding integrates all the pictures and papers presented in the Meeting. The 10 of the presented papers are indexed individually. (J.P.N.)
[en] The first part of this research thesis describes radio-frequency quadrupolar (RFQ) cavities in terms of electrostatic and electro-dynamic properties. It describes the construction of a RFQ four-wire model which leads to a differential equation describing the cavity electromagnetic behaviour. The operator spectral theory allows the eigenvalue problem to be solved. An experimental methodology applied to this cavity is presented, and experimental studies are reported with a good correlation between the model resonance modes and measurements performed on the mock-up. The second part reports the development of a mathematical formulation based on the perturbation of line parameters of the previously developed model. This allows the assessment of mechanical defects and of tuning piston control
[en] This research thesis deals with the modelling and numerical resolution of problems related to plasma physics. The interaction of charged particles (electrons and ions) with electromagnetic fields is modelled with the system of unsteady Vlasov-Maxwell coupled equations (the Vlasov system describes the transport of charged particles and the Maxwell equations describe the wave propagation). The author presents definitions related to singular domains, establishes a Helmholtz decomposition in a space of electro-magnetostatic solutions. He reports a mathematical analysis of decompositions into a regular and a singular part of general functional spaces intervening in the investigation of the Maxwell system in complex geometries. The method is then implemented for bi-dimensional domains. A last part addressed the study and the numerical resolution of three-dimensional problems
[en] Random amplified polymorphic DNA (RAPD) and inter simple sequence repeat (ISSR) markers were used to study the DNA polymorphism in 12 gamma ray induced morphological mutants of blackgram [Vigna mungo (L.) Hepper]. Of the 35 random and eight ISSR primers used, 15 random and five ISSR primers detected polymorphism among the mutants. Total number of bands varied from 2 to 9 for RAPD and from 6 to 10 for ISSR. The number of polymorphic bands varied from 1 to 3 for RAPD and from 1 to 6 for ISSR. Percentage of polymorphism ranged from 12.5 to 50.0 for RAPD and 12.5 to 44.4 for ISSR. Significant DNA polymorphism among the mutants were observed using RAPD (25.8%) and ISSR (33.3%) marker. An young leaf chlorine mutant and a smooth pod mutant showed more DNA polymorphism as compared to the parent. DNA polymorphism data revealed by RAPD and ISSR could facilitate selection of mutants to be involved in cross breeding and genome mapping
[en] The IMEF, PIEF and chemical analysis facilities were operated to examine irradiated fuels and materials as well as to keep operators safely under the strict radiological safety control. The major items performed are the hot cell examination of PIE for the domestically fabricated HANARO fuels, power reactor pressure vessel surveillance specimen tests and development of the hot cell test equipment and hot cell examination techniques. All of the radioactive wastes generated in 2002 from the facilities and the laboratories in KAERI were collected, treated and stored. To maintain the performance of the radioactive wastes treatment facility, the periodic inspection and maintenance of the process facilities was also carried out.
[en] The midday depression of CO2 assimilation in leaves of two cultivars of hazelnut. Effect of UV-B radiation on decay kinetics of long-term delayed luminiscence of green algae Scenedesmus quadricuda. Effects of irradiance on biomass allocation and needle photosynthetic capacity in silver fir seedlings originating from different localities. Chlorophyll fluorescence of UV-B irradiated bean leaves subjected to chilling in light. Preliminary studies on susceptibility of selected varieties of oats to high UV-B radiation dose. Influence of light conditions on oxidative stress in maize callus
[en] Present article is devoted to content of rare earth elements in fluorite. The data on content of rare earth elements in fluorite was systematized and generalized. The 446 analysis results were used. The rare earth elements content in fluorite of geologic deposits of various mineralogical and genetic type was defined.
[en] This proceedings contains articles of the Second China-Japan-Korea Joint Symposium on Optimization of Structural and Mechanical System. It was held on November 4-8, 2002 in Busan, Korea. This proceedings is comprised of 30 sessions. The main subject titles of session are as follows: Topology optimization, Structural optimization, Design with civil structures, Intelligent system, Automotive engineering, MDO, Vehicle and design engineering, MEMS, Genetic algorithms, Application to electronic devices, Damage identification, Emerging methods, Nuclear and design engineering, Optimization method, Reliability based design, Aerospace and design engineering, Aerodynamic optimization, Composite/Smart structures, Shape optimization, Structural systems and so on. (Yi, J. H.)
[en] This paper presents structural optimization for a micro optical switch based on the concept of a laterally driven electromagnetic microactuator (LaDEM). This utilizes a nonlinear behavior of a snap-through buckling occurring in two arch-shaped leaf springs of the switch, when actuated by a distributed Lorentz force induced along the leaf springs. An important objective in the design of the micro optical switch is to achieve a large displacement with low actuation force. For this purpose, a parametric study is first made. The most important parameters are found the initial rise and two sizes of the meander and chosen as design variables. The nonlinear displacement-load response is calculated by a modified Riks method in ABAQUS. Two formulations of structural optimization were studied. In the first formulation, the load needed for the micro mirror to reach a specific displacement is minimized subject to natural frequency and stress constraints. In the other optimization, the displacement was maximized for an applied load subject to the same constraints in the first approach. Nonlinear FE techniques and optimizations are found to be valuable tools for analysis and design of microactuators which utilize a complex nonlinear snap-through buckling behavior