No abstract available

[en] Although retrograde jejunogastric intussusception is rare as a post-gastrectomy complication, it is important that it be diagnosed as early as possible because of the high mortality in the acute type if surgery is not performed immediately. The clinical manifestations give some clue to the diagnosis, but a definite diagnostic method is Barium-meal examination. Three cases of retrograde jejunogastric intussusception are reported with a brief review of the literature. Among the three cases, two were the acute delayed type, and one was the acute postoperative type. Also, two of the three were the efferent loop type

[en] We present a complete set of conjectures for the exact boundary reflection matrix for ade affine Toda field theory defined on a half line with the Neumann boundary condition. (author)

[en] A library for shielding analysis has been developed, which is the MATXS-format and has a coupled structure of neutron 175 and gamma 47 groups. The PCA-REPLICA and NESDIP2 benchmarks which simulated LWR pressure vessel, the Winfrith Iron and Iron88 for validation of iron data and the Winfrith Graphite for validation of graphite data have been analyzed with the TRANSX/DANTSYS code systems. The differences between the calculated/measured dosimetry reaction rates are around 15% in the RPV, about 15% in the iron within 50cm thickness and about 10% in the graphite within 60cm thickness. These results are acceptable, considering the standard deviations of the measured data

[en] 112 cases of spontaneous penumoperitoneum, the causes of which were confirmed by clinical and surgical procedure at Presbyterian Medical Center from January, 1977 to July, 1981 were reviewed radiologically. The results were as follows: 1. Perforation of duodenal ulcer (46/112: 41.1%), stomach ulcer (22/112: 19.6%), and stomach cancer (11/112: 9.8%) were the three most common causes of spontaneous penumoperitoneum. These were 70.5% of all causes. 2. The most common site of free gas was both subdiaphragmatic areas (46: 41.1%). Others were Rt. subdiaphragmatic only (31: 27.7%), both subdiaphragmatic with subhepatic (16: 14.3%), Rt. subdiaphragmatic with subhepatic (7: 6.2%), Rt. subdiaphragmatic only (5: 4.4%), diffuse in abdomen (4: 3.6%), and subhepatic only (3: 2.7%). So 92.0% (103/112) were located in RUQ. 3. The radiological shape of free gas was classified: crescent (52: 46.4%) of small amount; half-moon (21: 18.8%) of moderate amount; large or diffuse (39: 34.8%) of large amount.4. The age between 31 and 60 occupied 69.1% (77/112), and male was predominant (5.2 times). 5. The patient's position showing free air most frequently was erect

[en] A continuous-energy neutron data library, called KNE68, has been generated for MCNP4C. The KNE68 library contains ACE format data processed from ENDF/B-V1 release 8 using the latest NJOY99.67 code. The continuous-energy monte carlo code MCNP4C supports the use of probability tables for handling the effects of self-shielding in the unresolved resonance energy range. These tables were generated using the PURR module of NJOY and merged into the new library. The validation process for KNE68 has been performed for a suite of criticality benchmarks established for validation nuclear data by Los Alamos National Laboratory

[en] The benchmark calculations with TRANSX/DANTSYS code system was performed against PNL30∼35 critical experiments to verify the code system's applicability to LWR MOX core. The MATXS library of 69 neutron groups for light-water-reactor problem was generated using NJOY code through processing the recent release of ENDF/B-VI nuclear data. Relative power distributions except outermost lattice fuel rods showed reasonable results, and the calculated k_eff of all cases showed good consistency with benchmark-model values or MCNP results. Moreover, calculated results indicate that there is an increase in k_eff with increasing lattice pitch, and showed the tendency that k_eff value for the borated case was higher than that for the unborated case with the same pitch

[en] The KERMA and damage data of lead, iron and silicon were generated from ENDF/B-VI.8, JENDL-3.3 and JEFF-3. The KERMA by the elastic, inelastic and disapperance reactions were calculated, respectively. The damage data by neutron irradiation were also generated and tried to calculate DPA of the materials. The material damage is mainly made by absorption reaction at lower energy, elastic next and inelastic scattering reactions at higher energy

[en] The scattering laws and MCNP thermal libraries for liquid hydrogen and deuterium are comparatively calculated on HP715 (32-bit computer) and SGI IP27 (64-bit computer) using NJOY97. The results are also compared with the experimental data. In addition, MCNP calculations for the nuclear design of a cold neutron source at HANARO are performed with the newly generated MCNP thermal libraries from two different computers and the results are compared

[en] The comparative study on the neutron data libraries processed for MCNP4C code has been performed with the latest evaluated nuclear data libraries ENDF/B-VI.8, JENDL-3.3, and JEFF-3.0. The benchmark calculations for the libraries have been conducted for 91 criticality benchmarks established for validating MCNP library by LANL. Out of these benchmarks, 11 assemblies have been selected to clarify the cause of large differences among three MCNP4C libraries. For the fast systems loaded with highly enriched U-233 or U-235, the effective multiplication factors resulting from the use of JENDL-3.3 or JEFF-3.0 have been increased due to the large U-235 fission reaction rates in the fast energy region. For the fast assemblies reflected with normal uranium, the k_eff's by JENDL-3.3 or JEFF-3.0 have a tendency to decrease from the large capture and small fission rates of U-238. Considering the use of unresolved-resonance probability tables, the benchmark results for fast assemblies including W-isotopes of ENDF/B-VI.8 or U-238 of JENDL-3.3 tend to excessively increase the k_eff's because of the small U-238 capture rates or the large U-235 fission rates