[en] Lead phosphorus triselenide, M_r=475.04, monoclinic, P2₁/n, a=6.897(3), b=7.642(3), c=9.696(4) A, β=91.51(1)⁰, V=510.9 A³, Z=4, D_x=6.174 g cm^-3, λ(MoKα₁)=0.7093 A, μ=545.7 cm^-1, F(000)=780.61 (including anomalous dispersion), T=123 K, R(F²)=0.070 for 1301 averaged reflections (including those having F₀²<0), R(F)=0.034 for 1062 reflections having F₀²>3σ(F₀²). The compound can be formulated as Pb₂(P₂Se₆) and the crystal structure consists of the packing of Pb²⁺ and P₂Se₆^4- ions. The Pb²⁺ ions are coordinated by eight Se atoms at the corners of a distorted bicapped trigonal prism. The P₂Se₆^4- ion has crystallographically imposed anti 1 symmetry and approximate anti 3m molecular symmetry. An earlier structure determination of PbPSe₃ in space group Pn appears to be in error. (orig.)

[en] Molten salt oxidation, MSO for short, is a robust technology that can effectively treat mixed waste (radioactive waste including hazardous metals or organics). It can safely and economically treat the difficult wastes such as not-easily destroyable toxic organic waste, medical waste, chemical warfare and energetic materials such as propellant and explosives, all of which are not easily treated by an incinerator or other currently existing thermal treatment system. Therefore, molten salt oxidation technology should be developed and utilized to treat a lot of niche waste stored in the nuclear and environmental industries. So, if we put the MSO technology to practical use by Korea-Vietnam joint research, we can reduce R and D fund for MSO technology by ourselves and we can expect an export of the outcome of nuclear R and D in Korea. For Establishment of cooperation basis of joint research concerning molten salt oxidation technology between KOREA and VIETNAM, in this research, We invited two Vietnamese researchers and we introduced our experimental scale molten salt oxidation system in order to let them understand molten salt oxidation technology. We also visited Viet man and we consulted about molten salt oxidation process. We held seminar on the mixed waste molten salt oxidation technology, discussed on the joint research on the mixed waste molten salt oxidation technology and finally we wrote MOU for joint research

[en] The structure of the new pentanary thiophosphate rubidium silver diniobium tris(disulfide) tetrathiophosphate, Rb_0.38Ag_0.5Nb₂PS₁₀, is made up of one-dimensional ¹_∞[Nb₂PS^-₁₀] chains along the [001] direction. These chains are separated from one another by Ag⁺ and disordered Rb⁺ ions. The Nb₂PS^-₁₀ chain is built up from bicapped trigonal prismatic Nb₂S₁₂ units which lie about inversion centres and tetrahedral PS₄ groups. The Nb₂S₁₂ units are linked together to form linear Nb₂S₉ chains by sharing S-S prism edges. Short [2.898 (1) and 2.908 (1) Aa] and long [3.724 (1) Aa] Nb..Nb distances alternate along the chains, and S₂^2- and S^2- anionic species co-exist in the structure. The Ag⁺ cation lies on an inversion centre and has distorted octahedral coordination described as a [2+4]- bonding interaction

[en] This paper introduces an advanced liquid metal microcirculation system that uses a liquid metal cycle driven by an electromagnetic pump to achieve heat dissipation. The overall thickness of the structure can be as flimsy as 0.9mm, and the heat dissipation capacity is more than twice that of the corresponding ultra-thin heat pipe. This paper analyzes the performance of the complex by experimenting with the sample and comparing it with the software simulation results, and demonstrates the theoretical analysis method of the liquid metal microcirculation system. (paper)

[en] The KNGR is an evolutionary reactor and is under development. This paper briefly describes standard design license system and primary design features of the Computerized Procedure System (CPS) and compares the CPS of the KNGR with other computer-based procedure systems. From a literature survey and an informal study, we firstly derive the review issues for safe plant operation - safety impact on operation personnel and shift performance, design for situation assessment and response planning, utilization during complex situations including the CPS failure, design for navigation and communication, and software quality. Then we present the preliminary evaluation results. From the literature survey of design and evaluation documents and an informal study, we found that CBP is a design trend and can support and enhance operator performance effectively. However there exist a few open issues too. That is why the designers need to implement CBP system thoughtfully. This paper addressed five issues for the review of the CPS for safe plant operation, but we will not limit to the review issues that are listed here. This paper also described the preliminary evaluation results. That is, we are on the long way of safety review. (authors)

[en] The purpose of this study is to assess the compatibility of DUPIC (Direct Use of Spent PWR Fuel in CANDU Reactors) fuel with the current CANDU 6 reactor, which is one of the technology being developed to utilize the spent PWR fuel in CANDU reactors. The Phase II study of this project includes the analysis of impact on the reactor safety, the development of core design technology, the development of fuel supply technology of optimal composition, and feasibility analysis on localization and license of DUPIC fuel. From the reactor safety analysis results, it is known that DUPIC fuel satisfies the safety limit of reactor containment and public dose for single failure. But, the safety limit may be exceeded for dual failure. Therefore, more analysis is needed for the removal of excessive conservatism in accident analysis methodology and modification of transient fuel behavior analysis methodology. The results of the validation calculations of core design methodology have confirmed that the current core analysis system is acceptable for the feasibility study of the DUPIC fuel compatibility analysis. The results of compatibility and fuel fabrication have shown that DUPIC fuel is technically feasible. For practical use and licensing, however, more research items required in the practical use, fuel rod and bundle design and fuel loading are should be performed. When these items are performed and resolved, the compatibility of the DUPIC fuel is achieved, and, eventually, the possibility of DUPIC fuel licensing can be confirmed

[en] The hybrid coupled shear wall system is more efficient and economical than individual structural walls because the steel coupling beams connected shear walls significantly increase the strength, stiffness and energy dissipation capacity of the system. In this study, experimental studies on the steel coupling beam were carried out. The main test variables were the ratios of the coupling beam strength to the connection strength. In addition, the seismic design methods are presented for steel coupling beam-wall connection and shear critical and flexure critical steel coupling beams in hybrid coupled shear wall system consisting of steel coupling beams and reinforced concrete shear walls. Finally, this paper provides background for design guidelines in hybrid coupled shear walls that include steel coupling beam-wall connections and steel coupling beams

[en] The formation behavior of YBa₂Cu₃O_7-x(Y123) and CuO phases in the heat-treated Cu-sheathed YBCO thick films was studied. The thick films were prepared by screen-printing method using BaCO₃ and Y211 powders on Cu tapes. The screen-printed thick films were placed at the center of the tube furnace, heated to 930 degree C in air atmosphere and then maintained at the temperature for 60 sec - 300 sec. The microstructure and phases formed in the thick films were investigated by using optical microscope, X-ray diffraction (XRD) and SEM image analysis. During the heat treatment, partial melting occurred rapidly in the printed layers by peritectic reaction between CuO and precursor powders, and then YBCO superconducting phases nucleated from the Cu tapes and grew in a form of thick films.

[en] Intra- and inter-particle coupling effects are important but have not been properly taken into account in modeling the optical response of an array of nano-objects. In this paper, we present a method to analyze the impact of electric quadrupolar coupling on the optical response of a layer of silver nanorods fabricated with oblique-angle deposition (OAD). Our technique can render the non-locally coupled nano-objects into an array of coarse-grained induced charges. The retrieved polarizability tensor of the silver nanorods exhibits non-zero off-diagonal components, revealing information about the array structure and inter-particle quadrupolar couplings. Thus, a more transparent picture of the correlation between the function and structure of an optical metamaterial can be yielded.

[en] A comprehensive decontamination scheme of the chemical and biological agents, including airborne agents and surface contaminating agents, is presented. When a chemical and biological attack occurs, it is critical to decontaminate facilities or equipments to an acceptable level in a very short time. The plasma flame presented here may provide a rapid and effective elimination of toxic substances in the interior air in isolated spaces. As an example, a reaction chamber, with the dimensions of a 22 cm diameter and 30 cm length, purifies air with an airflow rate of 5000 l/min contaminated with toluene, the simulated chemical agent, and soot from a diesel engine, the simulated aerosol for biological agents. Although the airborne agents in an isolated space are eliminated to an acceptable level by the plasma flame, the decontamination of the chemical and biological agents cannot be completed without cleaning surfaces of the facilities. A simulated sterilization study of micro-organisms was carried out using the electrolyzed ozone water. The electrolyzed ozone water very effectively kills endospores of Bacillus atrophaeus (ATCC 9372) within 3 min. The electrolyzed ozone water also kills the vegetative micro-organisms, fungi, and virus. The electrolyzed ozone water, after the decontamination process, disintegrates into ordinary water and oxygen without any trace of harmful materials to the environment