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Multimodal Analysis of Prompt and Delayed Neutron Emission in Fission
Takaaki Ohsawa,Atsushi Matsumoto 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The multimodal model of fission, in which the nucleus is considered tofollow a distinctive path on the deformation energy surface, finallyreaching a definite scission point configuration, has been proved to give agood description of the mass and kineticenergy distributions of fissionfragments. The Madland-Nix model of prompt fission neutron spectra (PFNS)considered the cooling of the fission fragments by neutron emission and theenergy dependence of the inverse reaction, providing a basic formalism forevaluation of the PFNS. Combination of the two models led to the multimodalMadland-Nix model. With further extension to consider the shell effects onthe level density and asymmetry in neutron multiplicity and nucleartemperature of the fragments, it was successfully applied to evaluation ofthe PFNS. On the other hand, the summation method of the delayed neutronyields (DNY) is the most fundamental approach to the estimation of thequantity. Combination of the method with the multimodal fission model led toa new approach to interpret the energy dependence of the DNY. Thisphysics-based approach has made it possible to understand the PFNS and DNYin a manner consistent with many other facets of fission physics. Someproblems about possible effects of scission neutrons, anisotropy of neutronemission in the center-of-mass system of the fragments, and neutron emissionduring acceleration are discussed.
Takaaki IGUCHI,Takumi UJIRO 한국소성가공학회 2010 기타자료 Vol.2010 No.6
A new stamping method developed by the authors, in which a temperature gradient is imposed on the workpiece during stamping, is capable of improving stretch formability in stamping of ferritic stainless steel sheets. Unlike the conventional warm stamping method, the temperature gradient is utilized in order to diffuse the strain distribution induced in the material. Basically, the portions of the sheets which are in contact with the top of the punch and die face are heated, while simultaneously, the portions in contact with the punch corners and die corners are intensively cooled The authors developed a finite element simulation model of stamping which analyzes mechanical and thermal behaviors simultaneously utilizing LS-DYNA3D. The numerical analysis, combined with a numerical model which evaluates the ductile fracture limit of the material in the high temperature region, confirmed that the new stamping method improves stretch formability and the optimal temperature gradient is given. In order to verify the numerical analysis, an experimental apparatus was constructed, comprising a set of stamping tools containing heaters and cooling circuits. The experiments demonstrated the correctness of the numerical analysis and the effectiveness of the new stamping method.
Central giant cell lesion of the mandible in a 2-year old girl
Takaaki Oda,Mikiko Sue,Yasuo Okada,Yoriaki Kanri,Junya Ono,Ichiro Ogura 대한영상치의학회 2017 Imaging Science in Dentistry Vol.47 No.3
Central giant cell lesions are rare, benign, osteolytic, pseudocystic, solitary, localized lesions that are common in the skeletal structure, but less so in the maxillofacial region. Furthermore, to perform panoramic radiography and cone-beam computed tomography, it is necessary to prepare patients properly and to position their heads carefully. However, this can be difficult in pediatric patients, who may be anxious. In this report, we describe the case of a central giant cell lesion of the mandible in a 2-year-old girl that was evaluated with multidetector computed tomography.
Potentiality of Oxygenated Fuels on Soot-Free Diesel Combustion
Takaaki Kitamura,Takayuki Ito,Jiro Senda,Hajime Fujimoto 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
Fuel/air equivalence ratio '??' and temperature 'T' have a significant effect on the quality of particulate formation. In other words, it is probable that smokeless diesel combustion is realized if ?? and T inside the burning plume could be controlled based on the dependence of those on soot formation. The purpose of this work is to extract smokeless ?? - T conditions for various kinds of fuels, including paraffinic hydrocarbon, aromatic hydrocarbon, and oxygenated hydrocarbon, and to discuss a possibility of smokeless diesel combustion avoiding a soot formation region on ?? - T diagram. Sooting ?? - T map, which shows the tendency to generate soot particles as a function of ?? and T, was made using a detailed soot formation model. The model was based on a combination of a detailed reaction mechanism to calculate the gas phase chemistry and a detailed kinetic soot model based on the method of moments. It was found that smokeless ?? - T condition becomes more widespread especially for oxygenated fuels, due to the notable reduc-tion of both acetylene and PAHs. As a result of this work, a new concept for diesel combustion has been developed that utilizes the smokeless nature of oxygenated fuels.
Place of Death and Density of Homecare Resources: A Nationwide Study in Japan
Takaaki Ikeda,Toru Tsuboya 대한노인병학회 2021 Annals of geriatric medicine and research Vol.25 No.1
Background: Although more than half of the population of Japan wants to spend their last days at home, approximately only 10% are able to do so. This study examined the associations between death at home and healthcare facility density by municipality based on the analysis of nationwide observed data in Japan. Methods: We used data on deaths at home and healthcare resources in municipalities across Japan for the fiscal years 2014 and 2017. The proportions of deaths at home by municipality were used as the dependent variable, while healthcare resources (e.g., hospital density) divided by the population of older people in each municipality and municipality-level income were used as independent variables. We applied a fixed-effects regression analysis to examine the association of healthcare resources and municipality-level income with death at home. Results: Clinics providing home medical care and facilities providing visiting nursing services were positively associated with death at home, with coefficients (95% confidence intervals) of 2.14 (1.12 to 3.15) and 2.19 (0.99 to 3.39), respectively. Stratified analysis showed that these associations were observed in higher income-level municipalities but not in lower income-level municipalities. Conclusion: Municipalities with a higher density of home care services had higher rates of death at home, whereas municipalities with a higher density of hospitals had lower rates. We recommend the development of policy that allows hospitals to be converted into home care providers so that more people can spend time in peace at home at the end of their lives.
Pediatric food impaction detected through point-of-care ultrasonography
Takaaki Mori,Takateru Ihara,Yusuke Hagiwara 대한응급의학회 2018 Clinical and Experimental Emergency Medicine Vol.5 No.2
A previously healthy 1-year-old boy suddenly began coughing while eating a dried sweet potato. Because he continued gagging after vomiting a piece of the dried sweet potato, his mother brought him to our emergency room. Upon arrival, despite normal pulmonary findings, he was drooling and gagging. Ultrasonography was performed because food impaction at the upper esophagus was suspected based on his medical history and physical examination, and results showed that a linear hyperechoic lesion was obstructing the posterior esophageal wall. Computed tomography was also considered for a detailed examination of the foreign body. However, the patient vomited the dried sweet potato before the test was performed. After vomiting the foreign body, the patient stopped gagging, and his ultrasonographic findings were normal. Therefore, the patient was discharged without any complications.