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Effects of Vertical Angle of Conical Punch on Stretch Flangeability of High Strength Steel

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Acta Metallurgica Sinica(English Letters) 2015年第12期28卷 1503-1509页

作者： Yasuhiro Ito Yoshiaki Nakazawa Yukihisa Kuriyama Katsuyuki Suzuk Noriyuki suzuki Nippon Steel and Sumitomo Metal Corporation The University of Tokyo

To clarify the effects of the vertical angle of a conical punch on stretch flangeability, hole expansion forming tests were conducted. Test results showed that the hole expansion ratio becomes larger as the vertical angle *** also showed that the fracture strain at the fracture location on the hole edge was constant and independent of the vertical angle. This is because the hole expansion ratio was controlled not only by the fracture strain, which is independent of the vertical angle, but also by deformation uniformity along the hole edge. From the result of numerical analyses, it was determined that deformation uniformity depends on the gradient of circumferential stress along the radius direction. When the vertical angle is sharp, the circumferential stress showed a steep decline and the deformation localization was suppressed. Consequently, the hole edge deformed more uniformly and the hole expansion ratio became larger. It is concluded that in order to improve stretch flangeability of high strength steel, it is important to uniformly deform the hole edge by applying a conical punch with a sharp vertical angle.

关键词： Formability Ductile fracture Finite element analysis Hole expansion test

Measurement of Shear Stress Acting on Flat Plate Using Oil Film Interferometry

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Open Journal of Fluid Dynamics 2023年第S1期13卷 217-225页

作者： Takamitsu Fujino Masaki Endo Hiromasa suzuki Yoko Sakakibara Mechanical Engineering Tokyo Denki University Saitama Japan Division of Mechanical Engineering Tokyo Denki University Saitama Japan Production Systems Engineering Course Tokyo Metropolitan College of Industrial Technology Tokyo Japan

Measurements of frictional resistance play an important role in engineering practice. There are several types of air resistance acting on an aircraft, for example. One of them, frictional resistance, accounts for half of the air resistance. Oil film interferometry is one of methods for measuring the frictional resistance. Oil dropped on an object is thinly stretched by the frictional resistance. The bright and dark fringe pattern is generated when monochromatic light is applied to the oil film. The gradient of the oil thickness decreases with the lapse of time, and thus the spacing between neighboring the dark lines increases. The rate at which the spacing increases is proportional to the frictional resistance. In this study, the frictional resistance acting on a small area on a plate was measured and compared with the theoretical value. As a result, these results qualitatively agree well with each other.

关键词： Oil Film Interferometry Fluid Friction Turbulent Flow Interference Fringes

Performance with Respect to Flue Gas Composition of a Combined Desulfurization/Denitration Process Using Powder-Particle Fluidized Bed

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Chinese Journal of Chemical Engineering 1999年第4期7卷 295-306页

作者：许光文王兵 Hironori suzuki Kunio Kato Department of Biological and Chemical Engineering Gunma UniversityKiryu 376-8515Japan

A new combined desulfarizatinn/denitraticon (DeSOx/DeNOx) procees was teeted in this study. The procees uses the so-called powder-partlcle fluidized bed (PPFB) as the major reactor in which a coarse DeNOx catalyst, several hundrsd micrometers in size, is fluidized by flue gas as the fluidization medium particles while a contlnuogsly supplied fine DeSOx sorbent, several to tens of micrometers in dianteter, is entrained with the flue gas. Ammonin for NOx reduction is fed to the bottom of the bed, thus, SOx and NOx are simultaneously removed in the single *** adopting a model gas, SO2-NO-HaO-N2-air, to simulate actual flue gas in a laboratory-scale PPFB, simultaneous SO2 and NO removals were explored with respect to various gas components of flue gas. It was found that the vaxlations of SO2 removal with concentrations (fractions) of oxygen, water vapor, SO2 and NO in flue gas are little affected by the simultaneous NOx reduction. However,the dependencles of NO removal upon such gas components are clveely related to the inter-actions between DeSOx sorbent and DeNOx catalyst.

关键词：性能烟道气直接脱硫脱硝工艺粉粒流化床 SOx NOx 环境保护

Investigation of microstructures of ZnCo_2O_4 on bare Ni foam and Ni foam coated with graphene and their supercapacitors performance

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Journal of Energy Chemistry 2017年第3期26卷 330-335页

作者： Jinlong Lv Tongxiang Liang Meng Yang suzuki Ken Miura Hideo Fracture and Reliability Research Institute School of EngineeringTohoku University School of Materials Science and Engineering Jiangxi University of Science and Technology

The graphene coating was deposited on the surface of Ni foam using the chemical vapor deposition process. A large amount of flower-like ZnCoOmicrospheres with short nanowires were formed on bare Ni foam by hydrothermal method, while large-scale ZnCoOnanowires arrays homogeneously aligned and separated adequately on Ni foam coated with graphene. This ZnCoOnanowire structure exhibited superior supercapacitors properties. The excellent supercapacitors were mainly attributed to the large specific surface and the porosity on the nanowires which promoted the electrons and ions transportation. In addition, graphene improved conductivity of substrate for current collecting.

关键词： Ni foam Graphene Supercapacitive Surface analysis Hydrothermal

Degradation of Reactive Yellow 86 with photo-Fenton process driven by solar light

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Journal of Environmental Sciences 2010年第9期22卷 1455-1461页

作者： Hideyuki Katsumata Syunya Koike Satoshi Kaneco Tohru suzuki Kiyohisa Ohta Department of Chemistry for Materials Graduate School of EngineeringMie UniversityTsu Environmental Preservation Center Mie UniversityTsu

The decolorization of Reactive Yellow 86 （RY 86）, one of reactive azo dyes, was investigated in the presence of Fenton reagent under solar light irradiation. The decolorization rate was strongly influenced by pH, initial concentrations of H202 and Fe（II）, and so on. An initial concentration of 40 mg/L was decolored more than 90% after 20 min under optimum conditions. The activation energy of the solar photo-Fenton reaction was 1.50 kJ/mol for RY 86 in the temperature range of 10-60℃. In the kinetic study, the rate constant of RY 86 with OH- radicals could be estimated to be 1.7 × 10^10 L/（***）. The decolorization efficiency of RY 86 under solar light irradiation was comparable to the artificial light irradiation. The decrease of TOC as a result of mineralization of RY 86 was observed during photo-Fenton process. The rate of RY 86 mineralization was about 83% under UV irradiation after 24 hr. The formation of chloride, sulfate, nitrate and ammonium ions as end-products was observed during the photocatalytic process. The decomposition of RY 86 gave two kinds of intermediate products. The degradation mechanism of RY 86 was proposed on the base of the identified intermediates.

关键词： reactive azo dye photo-Fenton reaction solar light irradiation decolorization mineralization

Comparison of the activities of binder-added and binder-free Mo/HZSM-5 catalysts in methane dehydroaromatization at 1073 K in periodic CH_4-H_2 switch operation mode

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Journal of Natural Gas Chemistry 2012年第6期21卷 729-744页

作者： Yuebing Xu Hongtao Ma Yo Yamamoto Yoshizo suzuki Zhanguo Zhang National Institute of Advanced Industrial Science and Technology (AIST) 16-10nogawa Tsukuba 305-8569 Japan Meidensha Co. Osaki 2-8-1 Shinagawa-ku Tokyo141-8565 Japan

Three industry-supplied, well-shaped Mo/HZSM-5 catalysts, two binder-added and one binder-free, were tested for the first time in methane dehydroaromatization to benzene at 1073 K and 10000 mL/（g·h） in periodic CH4-H2 switch operation mode, and their catalytic performances were compared with those of three self-prepared, binder-free powder Mo/HZSM-5 catalysts. XRD, 27Al NMR, SEM, BET and NH3-TPD characterizations of all the catalysts show that the zeolites in the two binder-added catalysts are comparable to those in the three binder-free powder catalysts in crystallinity, crystal size, micropore volume and Br{／o}nsted acidity. The test results, on the other hand, show that the catalytic performances of the two binder-added catalysts are worse than those of the four binder-free catalysts on both catalyst mass and zeolite mass bases. Then, TPO and BET measurements of all spent samples were conducted to get a deep insight into the negative effects of binder addition, and the results suggest that the binder additives functioned mainly to enhance the polyaromatization of formed aromatics to coke on their external surfaces and consequently lower the catalysts＇ benzene formation activity and selectivity.

关键词： methane dehydroaromatization Mo/HZSM-5 binder coke formation

Towards high degree of c-axis orientation in MgB_(2) bulks

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Journal of Magnesium and Alloys 2022年第8期10卷 2173-2184页

作者： M.A.Grigoroscuta G.V.Aldica M.Burdusel V.Sandu A.Kuncser I.Pasuk A.M.Ionescu T.S.suzuki O.Vasylkiv P.Badica National Institute of Materials Physics 405A Street AtomistilorMagurele 077125Romania National Institute for Materials Science 1-2-1 SengenIbarakiTsukuba 305-0047Japan

The paper presents fabrication and characterization of spark plasma sintered textured(001) MgB_(2)with a record degree of orientation of about 40% and 16% by high-energy ultra-sonication and slip casting in high magnetic field(12 T) and 0 T magnetic field, *** characterization was performed by X-ray diffraction, and electron microscopy. The analysis revealed unexpected preferred orientation also in the MgO secondary phase due to the epitaxial growth of(111) MgO on(001) MgB_(2). The influence of oriented microstructure on the superconducting characteristics expressed by critical current density(J_(c)), irreversibility field(H_(irr)), and on the pinning properties were assessed. High anisotropy versus sample orientation in applied magnetic field, H, was observed for J_(c), Hirr, pinning activation energy(U^(*))extracted from relaxation measurements. The zero-field critical current, J_(c0)and F_(p),maxare weakly or not dependent on the direction of H,while the other indicated parameters are significantly influenced. Results enable control of superconducting parameters by further optimization of microstructure through MgB_(2) texturing as a novel and viable strategy for development of bulk MgB2with enhanced properties when taking advantage of its anisotropy.

关键词： Textured MgB_(2)bulk Slip casting Spark plasma sintering Critical current density Pinning force Pinning activation energy

Role of androgen receptor in prostate cancer

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Asian Journal of Andrology 1999年第3期1卷 81-85页

作者： Hiroyoshi suzuki Haruo Ito Department of Urology Chiba University School of Medicine I-8-I Inohana Chuo-ku Chiba-shi Chiba 260-8670 JapanDepartment of Urology Chiba University School of Medicine I-8-I Inohana Chuo-ku Chiba-shi Chiba 260-8670 Japan

The growth of prostate cancer is sensitive to androgen, and hormonal therapy has been used for treatment of ad-vanced cancer. About 80% of prostate cancers initially respond to hormonal therapy, howerver, more than half of the re-sponders gradually become resistant to this therapy. Changes in tumors from an androgen-responsive to an androgen-unre-sponsive state have been widely discussed. Since androgen action is mediated by androgen receptor (AR), abnormalitiesof AR is believed to play an important role of the loss of androgen responsiveness in prostate cancer. This article focusedon the role of AR in the progression of prostate cancer. (Asian J Androl 1999 Sep; 1: 81-85)

关键词： androgen receptors prostatic neoplasms genetic change methylation

Nonalcoholic fatty liver disease: does sex matter?

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Hepatobiliary Surgery and Nutrition 2019年第2期8卷 164-166页

作者： Amedeo Lonardo Ayako suzuki Azienda Ospedalero-Universitaria di Modena Operating Unit of Internal MedicineOspedale Civile di BaggiovaraModenaItaly Division of Gastroenterology Duke UniversityDurhamNorth CarolinaUSA

Introduction The hallmark of nonalcoholic fatty liver disease(NAFLD)is the intrahepatocyte accumulation of lipids with or without necro-inflammatory changes and ballooning[i.e.,steatohepatitis or nonalcoholic steatohepatitis(NASH)],fibrosis,cirrhosis and hepatocellular carcinoma(HCC),which is observed in dysmetabolic individuals in the absence of competing causes of chronic liver disease such as excess alcohol consumption,viral infections,autoimmune or hereditary conditions and steatogenic medications(1).NAFLD represents an example of lipotoxicity caused by ectopic lipid *** relatively modest amounts of ectopic lipid accumulation in normally lean organs(e.g.,liver,pancreas,heart,kidney and muscle)can trigger functional disturbance in the affected organs and a subsequent vicious circle of adverse metabolic consequences in predisposed individuals(1);this will eventually result in those hepatic and extra-hepatic manifestations and co-morbid conditions which are frequently observed in NAFLD *** this perspective,NAFLD should be viewed as one of the systemic manifestations and consequences resulting from lipid overflow.

关键词： organs balloon consequences