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Multi-Detector-Row CT Diagnosis of Adrenal Incidentaloma in Patients with Hepatocellular Carcinoma

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Advances in Computed Tomography 2013年第1期2卷 34-40页

作者： Taisuke Harada Tamotsu Kamishima Satoshi Terae yuya Onodera Hiroki Shirato Department of Diagnostic and Interventional Radiology Hokkaido University Hospital Sapporo City Japan Department of Radiation Medicine Hokkaido University Graduate School of Medicine Sapporo City Japan Department of Radiology Keiyukai Sapporo Hospital Sapporo City Japan Faculty of Health Science Hokkaido University Sapporo City Japan

We investigate the diagnostic reliability of differentiating between lipid-poor adrenal adenomas and metastatic adrenal tumors originating from hepatocellular carcinoma (HCC) using a routine dynamic CT protocol for liver imaging. Eighteen metastatic adrenal tumors originating from HCC and 13 lipid-poor adrenal adenomas were identified. Dynamic CT data were analyzed for CT attenuation of adrenal lesions before and after contrast administration. When a cutoff of 36 HU was set for adrenal lesions at pre-contrast attenuation, the sensitivity and specificity for the diagnosis of metastatic lesions were 94.4%and 92.3%, respectively. Attenuation criteria on pre-contrast CT may help optimize the differentiation between these lesions.

关键词： CT Adrenal Incidentaloma Hepatocellular Carcinoma Lipid-Poor Adrenal Adenomas Metastatic Adrenal Tumors

Influence of Surface Properties Modified with Fine Shot Peening on Scuffing

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Journal of Surface Engineered Materials and Advanced Technology 2018年第3期8卷 58-69页

作者： yuya Omiya Masahiro Fujii Ryo Ochiai Koshi Ishimoto Akihiro Ueda Graduate School of Natural Science and Technology Okayama University Okayama Japan Research Laboratory Machine Elements Department IHI Corporation Yokohama Japan

Recently, gears of high strength, reliability, and surface-damage-resistant under severe service conditions are required to achieve the weight saving and downsizing of a product. For the high-speed condition in particular, it is important to understand the influence of the surface properties on the scuffing resistance. If the effective surface profile to improve the lubrication property was found, the metal surfaces could be obtained with both surface strength and surface lubricity. Herein, the influence of surface properties modified with fine shot peening, which can form the arbitrary surface profile, on the scuffing resistance in the rolling-sliding contact machine element, was investigated. The scuffing test was performed using a two-cylinder rolling contact test machine. In a specific sliding, a faster roller of 60% and a sliding velocity of 1.75 m/s were utilized. The scuffing test results with shot-peened test rollers and those with non-shot-peened test roller were compared. The influence of the surface roughness of the shot-peened test roller was also discussed. We found that the shot-peened roller had a better scuffing resistance compared with the roller without the shot-peening process.

关键词： Contact Element Scuffing Shot Peening Surface Properties Surface Roughness Micro Dimples

Photoluminescence Properties of Thulium and Cerium Co-Doped Tantalum-Oxide Films Prepared by Radio-Frequency Co-Sputtering

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Materials Sciences and Applications 2015年第4期6卷 263-268页

作者： Kenta Miura Takumi Osawa yuya Yokota Tetsuhito Suzuki Osamu Hanaizumi Graduate School of Science and Technology Gunma University Kiryu Japan

We prepared thulium and cerium co-doped tantalum-oxide (Ta2O5 :Tm, Ce) thin films by radiofrequency co-sputtering of Tm2O3 and CeO2 pellets on a Ta2O5 disc for the first time, and photoluminescence (PL) properties of the films annealed at 700°C, 800°C, 900°C, or 1000°C for 20 min were evaluated. PL peaks around a wavelength of 800 nm due to Tm3+?were observed for films annealed at 900°C or 1000°C. The peak intensities of films prepared using one Tm2O3 pellet and one CeO2 pellet were much stronger than those of films prepared using one Tm2O3 pellet and two CeO2 pellets or films prepared using two Tm2O3 pellets and one CeO2 pellet. To obtain the strongest PL intensity from the film, the proper Tm concentration was estimated to be around 1.0 mol%, and the proper Ce concentration was estimated to be around 1.3 mol%. Such Ta2O5:Tm, Ce co-sputtered thin films can be used as high-refractive-index materials of autocloned photonic crystals that can be applied to novel light-emitting devices, and they will also be used as anti-reflection and downconversion layers for realizing high-efficiency silicon solar cells.

关键词： Tantalum Oxide Thulium Cerium Co-Sputtering Photoluminescence

Development of a Freeze-Dried Skin Care Product Composed of Hyaluronic Acid and Poly(γ-Glutamic Acid) Containing Bioactive Components for Application after Chemical Peels

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Open Journal of Regenerative Medicine 2014年第3期3卷 45-53页

作者： Yuka Isago Ryusuke Suzuki Eri Isono yuya Noguchi Yoshimitsu Kuroyanagi R&D Center for Artificial Skin School of Allied Health Sciences Kitasato University Sagamihara Japan

Eight types of spongy sheet were prepared by freeze-drying aqueous solutions of hyaluronic acid (HA) and poly(γ-glutamic acid) (PGA) with or without bioactive components including vitamin C derivative (VC), glucosylceramide (GC), and epidermal growth factor (EGF). Spongy sheets were categorized into the following groups: Group I (HA/PGA), Group II (HA/PGA + VC), Group III (HA/PGA + GC), Group IV (HA/PGA + VC, GC), Group V (HA/PGA + EGF), Group VI (HA/PGA + VC, EGF), Group VII (HA/PGA + GC, EGF), and Group VIII (HA/PGA + VC, GC, EGF). In the first experiment, we examined fibroblast proliferation in conditioned medium that had been prepared by immersing each spongy sheet in a conventional culture medium. EGF-incorporating spongy sheets (Groups V-VIII) enhanced fibroblast proliferation more than EGF-free spongy sheets (Groups I-IV). In the second experiment, cytokine production by fibroblasts was evaluated using a wound surface model. This involved elevation of fibroblasts-incorporating collagen gel sheets to the air-liquid interface, on which a spongy sheet (Groups I, IV, V and VIII) was placed and cultured for 1 week. EGF-incorporating spongy sheets (Groups V and VIII) enhanced the production of vascular endothelial growth factor (VEGF) and hepatocyte growth factor (HGF) by fibroblasts more than EGF-free spongy sheets (Groups I and IV). The effect of these four types of spongy sheet on wounds was investigated in animal experiments. Chemical peel was performed by contacting 50% trichloroacetic acid (TCA) on the dorsal region of mice, after which a spongy sheet was placed, and the wound condition was then observed in a two-week period. Angiogenesis was facilitated to a greater degree in Group VIII compared with Groups I, IV and V. This finding indicates that Group VIII spongy sheet is a promising aid for skin recovery after chemical peel.

关键词： Chemical Peel Skin Care Product Hyaluronic Acid Poly(γ-Glutamic Acid) Vitamin C Derivative Glucosylceramide Epidermal Growth Factor

A New Method for the Exact Solution of Duffing Equation

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Journal of Applied Mathematics and Physics 2018年第12期6卷 2718-2726页

作者： Ossou Nazila Fred Nelson Zheng Yu Bambi Prince Dorian yuya Wang College of Economics Shanghai University Shanghai China School of Economics & Management Tongji University Shanghai China

A lot of methods, such as Jacobian elliptic function analysis, are used to look for the explicit exact solution of Duffing differential equation. The key of the analysis is to construct quotient trigonometric function, and then nonlinear algebraic equation set theory and method are used for the solution of some kinds of nonlinear Duffing differential equation. In this paper, the exact solution of Duffing equation is obtained by using constant variation method, making use of the formula to solve cubic equations and general solution of the homogeneous equation of Duffing equation with appropriate Constant m and function f(t) .

关键词： Duffing Equation Exact Solution Constant Variation Method

Preparation of CuO-Ta2O5Composites Using a Simple Co-Sputtering Method

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Journal of Materials Science and Chemical Engineering 2015年第9期3卷 47-51页

作者： Kenta Miura Takumi Osawa yuya Yokota Zobaer Hossain Osamu Hanaizumi Graduate School of Science and Technology Gunma University Kiryu Japan

We prepared CuO-Ta2O5 composite films using our simple co-sputtering method for the first time. Four specimens were prepared from an as-deposited CuO-Ta2O5 sample by cutting it using a diamond- wire saw, and the specimens were subsequently annealed at 600°C - 900°C. The X-ray diffraction and photoluminescence (PL) of the annealed specimens were evaluated. The CuO-Ta2O5 film annealed at 600°C seemed to be primarily amorphous phase, and a sharp PL peak at a wavelength of 450 nm, due to the existence of Cu2+, was observed from the film. In contrast, the CuO-Ta2O5 films annealed at 700°C, 800°C, and 900°C seemed to be tetragonal CuTa2O6 phases. We expect that good-quality CuTa2O6 films can be obtained using our very simple co-sputtering method and subsequent annealing above 900°C. Such CuTa2O6 films can be used in chemisorptions conductometric gas sensors.

关键词： Ta2O5 CuO Co-Sputtering X-Ray Diffraction Photoluminescence

Development of the Triode-type MCP-based Compact Ion Detector for High Pressure Operation in Miniature Mass Spectrometer

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Development of the Triode-type MCP-based Compact Ion Detecto...

Root Reconstruction with Total Replacement of Ascending Aorta Using Hypothermic Circulatory Arrest and Selective Cerebral Perfusion for Moderately Dilated Distal Ascending Aorta

2018年中国质谱学术大会（CMSC2018）

作者： Masahiro Hayashi yuya Washiyama Joji Sakakiyama Hayato Inoue Toshiyuki Uchiyama Hamamatsu Photonics K.K.

Recent interest in fieldable mass spectrometric applications has spurred a great deal of research into the development of a miniature mass spectrometer(MS). Since the advantage of the miniature MS is its portability, size reduction is required for composed parts. Vacuum pumps have to be small, therefore the miniature MS used in the system have to be operated under high pressure(up to 0.1 Pa). The conventional MCP-based ion detectors cannot be adapted to high pressure condition, because of ion feedback which causes discharges and decreases in signal-tonoise ratio. The new method is introduced which enables to operate an MCP-based ion detector stably in high pressure condition. Novel Aspect: The MCP-based compact ion detector for high pressure operation was developed by combining the triode structure with a novel potential mode.

关键词： miniature MS Vacuum high pressur ion feedback triode structure

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World Journal of Cardiovascular Surgery 2013年第3期3卷 101-105页

作者： Satoshi Yamashiro Ryoko Arakaki yuya Kise Hitoshi Inafuku Yukio Kuniyoshi Department of Thoracic and Cardiovascular Surgery University of the Ryukyus Nishihara Okinawa Japan

Objective: We have occasionally encountered a moderately dilated distal ascending aorta while reconstructing an aortic root. We describe reconstruction of an extended root and ascending aorta using our current strategy. Patients and Methods: Between March 2011 and December 2012, 15 (11 men;mean age, 70.1 ± 7.3 years) patients underwent root reconstruction with hemi-arch replacement under hypothermic circulatory arrest with antegrade selective cerebral perfusion. The maximum diameter of the aortic root was 52.5 ± 4.4 mm. The distal ascending aorta just below innominate artery was moderately dilated to 41.7 ± 1.4 mm in diameter. Results: Operative outcomes excluding the diameter of the distal ascending aorta did not significantly differ from those of patients who had undergone root reconstruction under distal ascending aortic clamping during the same period. Postoperative computed tomography confirmed complete resection of the dilated ascending aorta in the patients, and did not develop neurological dysfunction or stroke. Conclusion: Postoperative computed tomography confirmed complete resection of dilated ascending aortae. We considered that complete resection under hypothermic circulatory arrest and selective cerebral perfusion might help to avoid repeated surgery to treat dilation of the distal ascending aorta over the long-term.

关键词： Annulo-Aortic Ectasia Re-Operation

Recognition Ability of Three-Dimensional Shapes from Drawings——First Report:Analysis of Percentage of Correctness and Answering Time

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Recognition Ability of Three-Dimensional Shapes from Drawing...