[en] Tests were conducted to determine the electrical and magnetic characteristics of a superconductor shielded core reactor (SSCR). The results show that a closed-core SSCR is predominantly a resistive device and an open-core SSCR is a hybrid resistive/inductive device. The open-core SSCR appears to dissipate less than the closed-core SSCR. However, the impedance of the open-core SSCR is less than that of the closed-core SSCR. Magnetic and thermal diffusion are believed to be the mechanism that facilitates the penetration of the superconductor tube under fault conditions

[en] The authors detail a study of the effective interaction from a microscopic point of view. The main ingredient of such an interaction is the Brueckner G-matrix. The G-matrix interaction is obtained by solving the Bethe-Goldstone equation, where one may start from a realistic nucleon-nucleon potential such as the one-boson-exchange potential (OBEP). The authors discuss two effects which give rise to large changes of the G-matrix result and which are directly connected with the polarization inside the nucleus. The first correction follows from a consistent treatment of ''relativistic effects'' in the OBEP. The inclusion of the nuclear medium gives rise to changes in the effective meson coupling constants. The second correction to the G-matrix result arises from the inclusion of screening effects in the so-called ''crossed channel'' (induced interaction). The effect on the Δ-isobar nucleon-hole interaction is of crucial importance in connection with quenching effects in the spin-isospin channel. The spin-isospin resonances in the framework of a microscopic model are analyzed that the phenomenologically determined force parameters agree nicely with the theoretical results are demonstrated

[en] We calculate the γ decay from the isoscalar and isovector giant quadrupole resonances in ²⁰⁸Pb into the low-lying spectrum. Whereas the γ decay from the isoscalar giant quadrupole resonance into the first excited 3^- state is very small, the corresponding transition from the isovector giant quadrupole resonance is strongly enhanced. According to preliminary calculations, these results hold rather generally for other heavy mass nuclei. We suggest using this property in experimental investigation of the isovector giant quadrupole resonance

[en] Niobium superconducting bridges having a variable-thickness geometry consisting of a thin narrow implanted region joining two much thicker bulk films have been fabricated. The temperature dependence of the critical current is described well by the static theory of Likharev and Yakobson. The direct current and alternate current Josephson effects were observed at temperatures above the transition temperature T'/sub c/ of the bridge. The magnetic field period of the ''diffraction pattern'' dependence on magnetic field is analyzed taking into account demagnetizing effects in an approximate way. This field period H/sub p/ is found as a function of the bridge width w and the length L for wide bridges (w/L>>1), i.e., H/sub p/= (Phi₀/μ₀)/ 2/sup 2/3/w/sup 5/3/L/sup 1/3/

[en] The operational flexibility of the nuclear reactor is directly affected by reliability of the core protection system. In CPC (Core Protection Calculator) of CE-type nuclear power plants, the core axial power distribution is calculated to evaluate the safety-related parameters. The accuracy of the CPC axial power distribution highly depends on the quality of the so called shape annealing matrix (SAM). Currently, SAM is determined by using data measured during startup test and used throughout the entire cycle. An issue concerned with SAM is that it is fairly sensitive to measurements and there is no consistent, reliable way to determine SAM of high performance. In this paper, a novel method to determine a high-performance SAM is proposed, where both measured and simulated data are used in determining SAM and its effectiveness is demonstrated. (author). 9 refs., 2 tabs., 3 figs

[en] Neurologic impairments are very common among patients who get a recovery of spontaneous circulation after suffering from out-of-hospital cardiac arrest. Therapeutic hypothermia is established as a standardized therapeutic strategy for those patients in whom it decreases mortality rate and improves neurologic outcome. Herein, we report a case of patient who experienced out-of-hospital cardiac arrest with ischaemic heart disease and ventricular arrhythmia and got a full recovery without any neurologic impediments 2 months after being managed with therapeutic hypothermia. (author)

[en] We report the dielectric functions of InP at temperatures between 25 K and 700 K measured by using spectroscopic ellipsometry (SE) in the energy range from 1.19 to 6.57 eV. A blue shift and a separation of critical point (CP) structures were observed at low temperatures, which is explained by the reduced electron-phonon interaction and by the thermal expansion. The values of the CP energies were determined from numerically-calculated second energy derivatives of the data. Separation of the E₂ CP structures (4 - 6.5 eV), which could not be detected at room temperature, was clearly shown at low temperatures. We report the temperature dependences of the E'₂ and the E'₁ CP energies, which have not been observed so far by using SE.

[en] Neutron generation through Coulomb explosion of deuterium contained gas clusters is known as one of the very effective methods to produce fusion neutrons using a table top terawatt laser. The energy of ions produced through Coulomb explosions is very important factor to generate neutrons efficiently. Until the ion energy reaches around∼MeV level, the D D fusion reaction probability increases exponentially. The understanding of laser beam propagation and laser energy deposition in clusters is very important to improve neutron yields. As the laser beam propagates through clusters medium, laser energy is absorbed in clusters by ionization of molecules consisting clusters. When the backing pressure of gas increases, the average size of clusters increases and which results in higher energy absorption and earlier termination of laser propagation. We first installed a Michelson interferometer to view laser beam traces in a cluster plume and to measure spatial electron density profiles of a plasma channel which was produced by a laser beam. And then we measured the energy of ions distributed along the plasma channel with a translating slit to select ions from narrow parts of a plasma channel. In our experiments, methane gas was used to produce gas clusters at a room temperature and the energy distribution of proton ions for different gas backing pressure were measured by the time of flight method using dual micro channel plates. By comparing the distribution of ion energies and electron densities, we could understand the condition for effective laser energy delivery to clusters

[en] FAST code was developed to calculate the DNBR value and thermal margin in the reactor core of SMART. In the thermal margin analysis of whole core of SMART using FAST, 4-channel lumping model is applied to evaluate the minimum DNBR in the hot channel. There are two kinds of hot channel in SMART which is typical and thimble type. These hot channels have a similar hydraulic diameter in contrast with 16 by 16 type hot channel(OPR-1000 reactor) which is the thimble channel with a large guide tube. In this reason, a separate calculation according to the hot channel type assembly should be required on thermal margin analysis of SMART fuel. To reduce the time consuming process to look for the minimum DNBR value for a typical channel or a thimble channel, double channel method is suggested. The method is available to simultaneously calculate the minimum DNBR for two hot channels. As a result, single stage thermal margin calculation is available. Present study shows the double channel method and comparison results of MATRA-S thermal margin analysis

[en] This report described the experimental apparatus and the operation for the Na-CO₂ reaction experiments, and the analysis results through the experiments on the temperature and pressure of the sodium and gas flow