[en] The soil-structure interaction (SSI) analyses are being performed for the Korean next generation reactor (KNGR) design, because the KNGR is developed as a standard nuclear power plant concept enveloping various soil conditions. The SASSI program, which adopts the flexible volume method is used for the SSI analyses. Since the impedances are computed based on the assumption of a rigid foundation in the KNGR design, the impedances are computed at a single point around the center of the basemat. The base model used in the SSI analyses assumed that the subsurface slabs are free and not connected to the exterior walls. This results in a more flexible structure than reality. This study is performed to address the concern of the potential dynamic effect of this modeling assumption on the overall structural response. The super-structure model is modified with the subsurface portions of the sticks being laterally rigid, so that the entire subsurface cavity together with the super-structure model acts laterally rigid. For the comparison, the in-structure response spectra using the rigid subsurface model are compared with the original spectra without considering the connection effects

[en] Highlights: • Customized thermoelectric modules are fabricated for waste heat recovery. • A thermal resistance model is developed to simplify numerical simulations. • A plate fin structure is numerically optimized to improve conversion efficiency. • The numerical results are validated using experimental results and a correlation. • An equation is proposed to predict thermal resistances of fins in heat absorption. - Abstract: Thermoelectric modules (TEMs) are fabricated for a low-temperature waste heat recovery application. Each module has a surface area of 44 × 44 mm and a thickness of 3.6 mm, including a 1-mm-thick ceramic substrate on each side. Prior to fabrication of the system, a series of numerical simulations are conducted to optimize the design of the internal finned structures of a thermoelectric generator. To reduce the difficulty of designing the numerical models, a thermal resistance model is employed to determine the thermal conductivity of the TEM. The optimal number and thickness of the fin structures are determined with respect to the maximum allowable module temperature and the pressure drop characteristics. The accuracy of the numerical model is validated using an existing friction factor correlation and experimental results. The numerical results show that having six 2-mm-thick plate fins on the hot surface of each TEM would provide the most effective temperature fields for TE power generation while keeping the surface temperature of the TEM from exceeding the allowable maximum of ∼473 K. The pressure drop across the fins is found to increase with increasing number and thickness of fins. However, the module-level pressure drop is in the range of several pascals, which has a negligible effect on the combustion characteristics of the engine. A thermal resistance equation is proposed to predict the heat transfer characteristics of plate fins employed for thermoelectric generators for heat absorption.

[en] Power and hydrogen (H₂) production by burning and reforming ammonia (NH₃) in a micro-TPV (microscale-thermophotovoltaic) device integrated with a micro-reformer is studied experimentally. A heat-recirculating micro-emitter with the cyclone and helical adapters that enhance the residence time of fed fuel-air mixtures and uniform burning burns H₂-added NH₃-air mixtures. A micro-reformer that converts NH₃ to H₂ using ruthenium as a catalyst surrounds the micro-emitter as a heat source. The micro-reformer is surrounded by a chamber, the inner and outer walls of which have installations of gallium antimonide photovoltaic cells and cooling fins. For the micro-reformer-integrated micro-TPV device the maximum overall efficiency of 8.1% with electrical power of 4.5 W and the maximum NH₃ conversion rate of 96.0% with the H₂ production rate of 22.6 W (based on lower heating value) are obtained, indicating that the overall efficiency is remarkably enhanced compared with 2.0% when the micro-TPV device operates alone. This supports the potential of improving the overall efficiency of a micro-TPV device through integrating it with a micro-reformer. Also, the feasibility of using NH₃ as a carbon-free fuel for both burning and reforming in practical micro power and H₂ generation devices has been demonstrated. - Highlights: • Performance of micro-TPV device integrated with micro-reformer is evaluated. • Feasibility of using NH₃–H₂ blends in integrated system has been demonstrated. • Integration with micro-reformer improves performance of micro-TPV device. • Maximum overall efficiency of 8.1% is found compared with 2.0% without integration

[en] In 1968 total 94,660 mc of radioactive iodocompound were prepared and distributed to the urers. In order to obtain an effective liver scanning ^113mIncolloidal of even partical size from a ¹¹³Sn-^113mIn cow, the eluate(pH; 1.5) was examined by a radio paper partition chromatography. It was found that the eluate was composed of two components, ionic from and colloidal form. The ionid from could be eliminated by cation exchange resine and the eluate from the ion exchange resine was of even particle size to give an excellent liver scanning results. Labelling of ^113mIn to human serum albumine was attempted.

[en] In 1969 this laboratory had prepared 131 mc. of radiopharmaceuticals in total (Hippuran and other four kinds) and distributed to the major medical establishment. The quality and stability of these products were reviewed by means of radio paper partition chromatography and thin layer chromatography and results were compared to those of foreign products. Generally, the quality and stability of the product of this laboratory were better than those of the foreign product, even though the properties of the radiopharmaceutical were varied by the procedure of the preparation adopted. Various precautions for handling radiopharmaceuticals for clinical use were also described with a view of quality control and stability test there of.

[en] Spent solder-stripping solutions containing tin, copper, iron, and lead in nitric acid solution, are by-products of the manufacture of printed-circuit boards. The recovery of these metals and the nitric acid, for re-use has economic and environmental benefits. In the spent solder-stripping solution, a systematic method to determine a suitable process for recovery of valuable metals and nitric acid was developed. Initially, more than 90% of the tin was successfully recovered as high-purity SnO_2 by thermal precipitation at 80 ℃ for 3 hours. About 94% of the nitric acid was regenerated effectively from the spent solutions by diffusion dialysis, after which there remained copper, iron, and lead in solution. Leakage of tin through the anion-exchange membrane was the lowest (0.026%), whereas Pb-leakage was highest (4.26%). The concentration of the regenerated nitric acid was about 5.1 N.

[en] Highlights: • A novel heat-recirculating combustor for TPV power conversion is suggested. • The combustor consists of multi injectors, an emitter a shield and a recuperator. • The combustor with closer injectors shows an extended stable-burning regime. • The SiC emitter shows higher spectral emissive power density than the SUS emitter. • The suggested combustor is acceptable for practical TPV applications. - Abstract: A novel configuration of a heat-recirculating combustor with multiple injectors for 10–30 W power-generating thermophotovoltaic (TPV) systems is suggested. For the combustor as a heat source the combustion stability limits of premixed butane-air flames, the temperature distribution on the outer wall surface and the spectral emissive power density onto photovoltaic cells are measured to evaluate the combustion and radiation performance. Results show that the combustor can sustain stable burning and effective and uniform heat transfer for a wide operating range, due to the heat-recirculation using a cylindrical emitter with a quartz shield and a recuperator. Two distinct combustion stability limits, i.e., flashback and blowout limits, are observed, and a somewhat extended stable-burning regime is found for the combustor with a finned recuperator and closer injectors. The recuperator and injector geometry also affects the temperature distribution on the emitter wall surface. A silicon carbide (SiC) emitter shows higher spectral emissive power density than the stainless steel emitter, due to higher surface temperature and emissivity, and the emissive power density is further enhanced by applying the photonic crystal structure on the SiC emitter surface, due to the optical resonance effects. Thus, the present combustor configuration can be used in practical TPV power systems.

[en] Odontogenic keratocyst (OKC) with secondary inflammation involving the maxillary sinus was presented. Radiological diagnosis of this case was made based on the various findings from the cone-beam computed tomography, computed tomography and magnetic resonance images. There were calcified materials and impacted tooth within the lumen of the lesion, which is not uncommon in OKC. Histopathologic findings confirmed this lesion as OKC with secondary inflammation.

[en] Mercury bromo hydroxy propane-Hg²⁰³, ^99mTc colloidal, ^99mTc pertechnate (from ^99mTc Generator) were prepared and prepared products were tested their clinical usability to give agreeable results. Labelling of HSA by ^99mTc and coagulation of HSA to MAA were conducted on a lab. scale. The iodine containing Radiopharmaceuticals; Hippuran, Sodiumiodide (inj), RISA, MAA, Rosebengal, Triolein, Phosphorus protein and Mercury²⁰³ neohydrine were prepared by the conventional procedure. Total 206. 4 mC of Radiopharmaceuticals were prepared and 141.910 mC of them were distributed to the major users in this country.

[en] The purpose of this study is to evaluate ultimate pressure capacity of test model which is 1:4 scale structure of a 540 MWe pressurized heavy water reactor containment building. PHWR containment building is pre-stressed concrete structure with bonded tendon system, and inside surface of the structure is coated with epoxy. Two steam generator openings in dome along with main airlock, fuelling machine airlock and emergency airlock barrel openings in cylindrical wall are included in this structure, and that is designed for an internal pressure of 0.142 MPa. In this study, PHWR containment building is idealized as three-dimensional finite element model, and a nonlinearity of the materials is considered for estimation of structural failure. Concrete structure is modeled using 4-node tetra solid elements, and damaged plasticity concrete model is applied for material behavior of concrete. Bonded tendon and reinforcement are modeled as truss elements, and they are embedded in concrete model. Therefore, the tendons are completely bonded with concrete without friction behavior, and compressive stresses also are directly induced to the concrete through pre-stressing forces in tendon. This paper represents structural failure modes of the containment structure under high pressure, and summarizes the analysis result