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排序方式: 共有62条查询结果,搜索用时 15 毫秒
1.
Ryo Hashikawa Yasuhiro Fujii Atsushi Kinomura Takeshi Saito Arifumi Okada Takashi Wakasugi Kohei Kadono 《Journal of the American Ceramic Society》2019,102(4):1642-1651
Radiophotoluminescence phenomena have been widely investigated on various types of materials for dosimetry applications. We report that an aluminoborosilicate glass containing 0.005 mol% copper exhibits intense photoluminescence in the visible region induced by X-ray and γ-ray irradiation. The luminescence is assigned to the 3d94s1 → 3d10 transition of Cu+. The proportionality of the intensity of the induced photoluminescence to the irradiation dose was confirmed up to 0.5 kGy using 60Co γ-ray irradiation. Based on the spectroscopic results, a potential mechanism was proposed for the enhancement of the photoluminescence. The exposure to the ionizing radiation generates electron-hole pairs in the glass, and the electrons are subsequently captured by the Cu2+ ions, which are converted to Cu+ and emit the luminescence. For the glass containing 0.01 mol% copper, the pronounced enhancement of the photoluminescence was not observed because the reverse reaction, ie, the capture of the holes by the Cu+ ions, becomes prominent. The photoluminescence induced by the irradiation was stably observed for the glasses kept at room temperature and even for the glasses heat-treated at 150°C. However, the induced photoluminescence could be eliminated by the heat treatment at a temperature at 500°C, and the glass returned to the initial pre-irradiation state. The Cu-doped aluminoborosilicate glass is a potential candidate for use in dosimetry applications. 相似文献
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Crystallization peak temperature was measured for Li2O · 2SiO2 glass with various number densities of nuclei induced by long heat-treatment (405 h) at 460°C. Its crystallization process of Li2O · 2SiO2 glass was simulated numerically in order to examine the effect of the initial size of nuclei on crystallization behavior, and the relationship between crystallization peak temperature and the number density of nuclei in the glass was considered. It was found that the effect of nuclei size is not significant when the heat-treatment temperature is lower than 460°C. By considering the effect of nuclei size, number density of nuclus was evaluated by DTA method accurately. 相似文献
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5Na2O·95(SiO2 + TiO2 + ZrO2) gels together with Na2O-MO2 gels (MO2 = SiO2, TiO2, ZrO2) were synthesized and effect of Na2O addition to the gel formation and crystallization behavior were studied. From Si(OC2H5)4, Ti(iso-OC3H7)4, Zr(n-OC3H7)4 and NaOCH3 solutions in EtOH without H2O, transparent, opaque and heterogeneous gels were obtained. By SEM observation, it was found that the opague bulk gels, rich in TiO2 or ZrO2 component, contain agglomerated spherical particles of less than 10 m diameter. Crystallization temperature (Tc) measured by DTA decreased sharply from 1258°C (SiO2) to 613°C (30Na2O·70SiO2) due to the increasing non-bridging oxygens in the Na2O-SiO2 system. But in the Na2O-TiO2 and Na2O-ZrO2 systems, Tc increased as Na2O content was increased up to 10 mol%. The thermal stability, defined by Tc/TL ratio, decreased from Tc/TL = 0.77 (SiO2) to 0.57 (5Na2O·95SiO2) or increased from Tc/TL = 0.30 (TiO2) to 0.67 (30Na2O·70TiO2) with Na2O addition. In the 5Na2O·95(SiO2 + TiO2 + ZrO2) system maximum Tc was 891°C at 5Na2O·76SiO2·19ZrO2 composition and decreased as TiO2 or ZrO2 contents increased. Compared with the SiO2-TiO2-ZrO2 gels, Tc of the 5 mol%Na2O containing gels (Na2O-SiO2-TiO2-ZrO2) was lower in SiO2 rich composition and higher in TiO2 or ZrO2 rich compositions. It is assumed that addition of Na2O changed the structure of amorphous TiO2 and ZrO2 someway to increase their thermal stability or amorphous forming ability. After DTA run up to 1000°C, cystalline phases precipitated in the 5Na2O·95(SiO2 + TiO2 + ZrO2) gels were determined by XRD analysis. 相似文献
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Shigeyuki Nagata Kengo Fukuzawa Yukio Iwashita Akira Kabashima Tadahiko Kinoshita Kenzo Wakasugi Yoshihiko Maehara 《Nutrition journal》2009,8(1):24-8
Background
Many clinical studies have demonstrated that early postoperative enteral nutrition (EN) improved the postroperative course. Post-pancreaticoduodenectomy (PD), patients tend to suffer from postoperative nausea, abdominal distention, and diarrhoea, causing difficulty in the introduction of EN. In this pilot study, we investigated the appropriate nutritional mode post-pancreatic surgery. 相似文献7.
Wakasugi K. Naru-Fumi Kishi Matsuo M. 《Geoscience and Remote Sensing, IEEE Transactions on》1986,(5):732-737
An analytic model of the ocean surface SAR images with a three-dimensional framework is developed following the formalism presented by Swift and Wilson (1979); a trochoidal swell propagates through a uniform field of Bragg-type distributed scatterers. Two- dimensional SAR images are calculated for the interpretation and prediction of actual SAR images of the ocean surface as a function of ocean wave amplitude, wave frequency, propagation direction, and radar frequency, off-nadir angle of the antenna, and spatial resolutions. 相似文献
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In view of the importance of tramp element contamination of steel products through a large volume of scrap consumption in the near future, the thermodynamic behaviour of Sb, As, Sn and Cu in CaO—CaF2 melts under reducing conditions was studied by examining the dependences of distribution of each element between Cu, Ag or Sn alloys and CaO—CaF2 melts on the CaO activity, oxygen partial pressure and temperature around 1 500°C. As a result, the reaction products on treatment by Ca compounds were demonstrated to be Ca3Sb2, Ca3As2, Ca2Sn and CaCu. Experimentally obtained distributions were extrapolated to lower oxygen partial pressures less than 10?18 atm to estimate the feasibility of removing those tramp elements from molten iron. It is thermodynamically indicated that if the prevailing oxygen partial pressure of the environment is below 10?23 atm, these impurities, except Cu, would be substantially removed from molten steel. 相似文献
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H Wakasugi K Koyama M Gyotoku M Yoshimoto S Hirohashi T Sugimura M Terada 《Canadian Metallurgical Quarterly》1995,86(11):1086-1096
Tumors developed quite frequently in some of the visceral organs, including spleen and liver, in BALB/c nude mice upon subcutaneously xenografting surgical specimens from five different inflammatory breast cancer patients. All of these tumors developed within two and a half months to one year after the subcutaneous inoculation of surgical specimens. From these tumors, five independent transplantable tumors, including tMK-2, tHK-1, tYK-1, tYK-2 and tTY-1 have been established. Chromosome analysis, morphologic studies by light and electron microscopy and phenotype analysis indicated that these tumors are of mouse origin. The tMK-2 tumor was highly metastatic to the spleen and liver when it was subcutaneously transplanted into the right scapular region. In addition, the region where the tMK-2 tumor cells were subcutaneously inoculated showed an apparently inflammatory process represented by erythema. After subcutaneous inoculation into the right scapular region, tHK-1, tYK-1, 2, and tTY-1 tumors also metastasized to some of the visceral organs, including spleen and liver. From these tumors, in vitro cell lines were established. The cells grew in a stromal-cell dependent manner under in vitro culture conditions. The cells were again tumorigenic at the inoculated region and metastasized to various organs, including liver and spleen, of BABL/c nude mice. Histological examination revealed that the tumors showed features of malignant lymphoma. Phenotypically, these five tumors expressed early T lymphocyte markers as revealed by anti-mouse anti-TcR alpha/beta, anti-CD3, CD4 and CD8 monoclonal antibodies. To our knowledge, these cell lines are the first T-cell lines showing the phenotype of extrathymically differentiated T-cells in the liver. 相似文献