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Yamaguchi A.,Hyogo Prefectural Institute of Technology | Mitsutani Y.,Hyogo Science and Technology Association | Gotoh K.,Hyogo Prefectural Institute of Technology | Tomita T.,Hyogo Prefectural Institute of Technology | Fukumoto S.,Osaka University
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals | Year: 2010

The infiltration process of Cu-Sn alloy into indirect selective laser sintered (SLS) stainless steel preforms was investigated. The heating rate for the infiltration process was 0.17 K/s and the holding temperature was varied from 1293 to 1473 K for 3.6 ks. The process was carried out in an inert gas atmosphere. Although the volume of the preforms without infiltration decreased with increasing sintering temperature, the volume of the infiltrated parts remained constant at approximately -5%. The stainless steel particles were coarsened by the increasing holding temperature during infiltration; however, the area ratio of stainless steel particles remained constant at approximately 60% regardless of the holding temperature. The tensile strength and elongation of the infiltrated parts were approximately 540 MPa and 10%, respectively, regardless of the holding temperature. © 2010 The Japan Institute of Metals. Source

Nishino T.,Kobe University | Kotera M.,Kobe University | Suetsugu M.,Kobe University | Murakami H.,Kobe University | Urushihara Y.,Hyogo Science and Technology Association
Polymer | Year: 2011

Natural cellulosic ramie fiber was acetylated using supercritical carbon dioxide (sc-CO2) as a reaction medium. The structure and properties of the acetylated fibers were investigated using infrared spectroscopy, scanning electron microscopy, X-ray diffraction (including synchrotron microbeam X-ray diffraction), nano-Raman scattering, and a tensile test. The acetylation reaction proceeded without using an organic solvent, and it reached to the core part of the fiber within a short period while maintaining the fiber morphology. The crystallites of cellulose triacetate II and cellulose coexist in the fiber. The acetylated fiber with an average degree of substitution of 1.9 showed high modulus (34.5 GPa) and high strength (763 MPa), which are the highest values for cellulose diacetate so far reported to date. © 2010 Elsevier Ltd. All rights reserved. Source

Yamamoto Y.,Tohoku University | Chikawa J.,Hyogo Science and Technology Association | Uegaki Y.,Yamanashi Prefectural Fuji Industrial Technology Center | Usuda N.,Aichi University | And 2 more authors.
Cancer Science | Year: 2010

Exposure to internally deposited radionuclides is known to induce malignant tumors of various histological types. Thorotrast, a colloidal suspension of radioactive Thorium dioxide (232ThO2) that emits alpha-particles, was used as a radiographic contrast during World War II. Thorotrast is known to induce liver tumors, particularly intrahepatic cholangiocarcinoma (ICC) and angiosarcoma (AS), decades after injection. Therefore, patients injected with Thorotrast comprise a suitable study group to understand biological effects of internal ionizing radiation injury. Autoradiography and X-ray fluorescence spectrometry (XRF) were carried out on non-tumorous liver sections from Thorotrast-induced ICC (T-ICC) and Thorotrast-induced AS (T-AS). Autoradiography revealed that the slope of the regression line of the number of alpha tracks for the amount of deposited Thorium (232Th) was higher in non-tumorous parts of the liver with T-ICC than those with T-AS. XRF showed that the intensity ratio of Radium (Ra) to Thorium (Th) in non-tumorous liver tissue with T-ICC was significantly higher than that with T-AS. Furthermore, the mean 228Ra/232Th radioactivity ratio at the time of death calculated was also significantly higher in T-ICC cases than in T-AS cases. These suggest that the metabolic behavior of radionuclides such as relocation and excretion, as well as the content of deposited radionuclides, is a major factor in determining the histological type of Thorotrast-induced liver tumors. © 2009 Japanese Cancer Association. Source

Han S.-M.,Catholic University of Daegu | Chikawa J.-I.,Hyogo Science and Technology Association | Jeon J.-K.,Catholic University of Daegu | Hwang M.-Y.,Catholic University of Daegu | And 6 more authors.
Microscopy Research and Technique | Year: 2016

Nanoscopic synchrotron X-ray imaging was performed on scalp hair samples of patients with breast cancer and healthy individuals to investigate any structural differences as diagnostic tool. Hair strands were divided into 2-3 segments along the strands from root to tip, followed by imaging either in projection or in CT scanning with a monochromatic 6.78-keV X-ray using zone-plate optics with a resolving power of 60 nm. All the examined cancer hairs exhibited medulla loss with cancer stage-dependent pattern; complete loss, discontinuous or trace along the strands. In contrast, medullas were well retained without complete loss in the healthy hair. In the CT-scanned axial images, the cortical spindle compartments had no contrast in the healthy hair, but appeared hypointense in contrast to the surrounding hyperintense cortical membrane complex in the cancer hair. In conclusion, observation of medulla loss and cortical membrane enhancements in the hair strands of breast cancer patients demonstrated structural variations in the cancer hair, providing a new platform for further synchrotron X-ray imaging study of screening breast cancer patients. Microsc. Res. Tech. © 2016 Wiley Periodicals, Inc. Source

Hongo C.,Kobe University | Kotera M.,Kobe University | Urushihara Y.,Hyogo Science and Technology Association | Izumo D.,Kobe University | Nishino T.,Kobe University
16th European Conference on Composite Materials, ECCM 2014 | Year: 2014

Polymer laminate interfaces were analyzed with high spatial resolutions using scanning thermal microscopy, synchrotron micro-beam X-ray diffraction, and confocal laser nano-Raman spectroscopy. For poly-α-olefin laminates, such as linear low density polyethylene (LLDPE)/deuterated polyethylene (D-PE) and, LLDPE/isotactic polypropylene (it.PP) combinations, the interfacial thickness was evaluated as several micrometer, which changed by annealing. The adhesive strength was found to be correlated with the interfacial thickness. Source

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