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MR尿路成像对可疑上段输尿管上皮癌的诊断

国际医学放射学杂志 2009年第3期 307-307页

作者： N.Takahashi a.kawashima J.F.Glockner R.P.Hartman B.Kim B.F.King 周炳 Department of Radiology Mayo Clinic200 First Street SWRochesterMN 55905USA

可疑上段输尿管上皮癌MR尿路成像关键的是冠状面平扫T2水成像以及肾实质期和肾盂期T1钆增强的3D扰相梯度回波序列。上段输尿管上皮癌基于生长方式和范围分为乳头型、平坦型以及浸润型。乳头状病变在T2加权水成像及T1WI的肾盂期表现为小... 详细信息

可疑上段输尿管上皮癌MR尿路成像关键的是冠状面平扫T2水成像以及肾实质期和肾盂期T1钆增强的3D扰相梯度回波序列。上段输尿管上皮癌基于生长方式和范围分为乳头型、平坦型以及浸润型。乳头状病变在T2加权水成像及T1WI的肾盂期表现为小的软组织信号充盈缺损。在肾实质期表现为均一强化。平坦型在肾实质期表现为输尿管壁节段区域的弥漫增厚及强化。

关键词： MRI 肾输尿管 MR尿路成像

小的(<4cm)肾脏肿块:利用MR成像鉴别无明显脂肪的血管平滑肌脂肪瘤与肾细胞癌

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国际医学放射学杂志 2012年第3期 282-282页

作者： K.Sasiwimonphan N.Takahashi B.C.Leibovich R.E.Carter T.D.Atwell a.kawashima 麻智慧 Department of Radiology King Chulalongkorn Memorial HospitalFaculty of MedicineChulalongkorn UniversityBangkokThailand

目的探讨联合MR多个参数是否有助于鉴别小的无明显脂肪的血管平滑肌脂肪瘤(AML)与肾细胞癌(RCC)。材料与方法这项符合HIPAA法案的回顾性研究已得到机构审查委员会的批准,69例男性病人和42例女性病人(平均59.7岁)接受了MR检查,其中包括1... 详细信息

目的探讨联合MR多个参数是否有助于鉴别小的无明显脂肪的血管平滑肌脂肪瘤(AML)与肾细胞癌(RCC)。材料与方法这项符合HIPAA法案的回顾性研究已得到机构审查委员会的批准,69例男性病人和42例女性病人(平均59.7岁)接受了MR检查,其中包括15例无明显脂

关键词：肾细胞癌 AML 延迟期动脉期血管平滑肌脂肪瘤 RCC MR 脂肪

双能量CT肾盂成像非强化虚拟成像显示泌尿系结石

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国际医学放射学杂志 2010年第5期 475-475页

作者： N.Takahashi T.J.Vrtiska a.kawashima R.P.Hartman A.N.Primak J.G.Fletcher 颜荣华 Department of Radiology Mayo Clinic 200 First St SW

关键词：泌尿系结石双能量虚拟成像肾盂 CT

Experiment on a Semi-Active In-Car Crib with Joint Application of Regular and Inverted Pendulum Mechanisms Using Scale Model

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第1期35卷 28-37页

作者： kawashima Takeshi Department of Mechanical Engineering Kanagawa Institute of Technology

To reduce the collision shock and risk of injury to an infant in an in-car crib(or in a child safety bed)during a car crash,it is necessary to limit the force acting on the crib below a certain allowable *** realize this objective,we propose a semi-active in-car crib system with the joint application of regular and inverted pendulum *** crib is supported by arms similar to a pendulum,and the pendulum system itself is supported by arms similar to an inverted *** addition,the arm acting as a regular pendulum is joined with the arm acting as an inverted pendulum through a linking mechanism for simplicity,and the friction torque of the joint connecting the base and the latter arm is controlled using a brake mechanism,which enables the proposed in-car crib to gradually increase the deceleration of the crib and maintain it at around the target *** system not only reduces the impulsive force but also transfers the force to the infant′s back using a spin control system,i.e.,the impulse force is made to act perpendicularly on the *** spin control system was developed in our previous *** present work focuses on the acceleration control system.A semi-active control law with acceleration feedback is introduced using the sliding mode control ***,a feedback system of the crib acceleration relative to the vehicle is proposed for the high-vibrational ***,a control experiment using scale model is conducted to confirm the effectiveness,and some results are reported.

关键词： shock control occupant crash protection passive safety device child restraint system impact relaxation

A fast convergence fourth-order Vlasov model for Hall thruster ionization oscillation analyses

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Plasma Science and Technology 2022年第2期24卷 117-126页

作者： Zhexu WANG Rei kawashima Kimiya KOMURASAKI Univ Tokyo Bunkyo Ku 7-3-1 Hongo Tokyo 1138656 Japan

A 1D1 V hybrid Vlasov-fluid model was developed for this study to elucidate discharge current oscillations of Hall thrusters(HTs).The Vlasov equation for ions velocity distribution function with ionization source term is solved using a constrained interpolation profile conservative semiLagrangian *** fourth-order weighted essentially non-oscillatory(4 th WENO)limiter is applied to the first derivative value to minimize numerical oscillation in the discharge oscillation *** fourth-order accuracy is verified through a 1 D scalar test *** and high-resolution features of the Vlasov model are confirmed by simulating the test cases of the Vlasov–Poisson system and by comparing the results with a particle-in-cell(PIC)method.A1 D1 V HT simulation is performed through the hybrid Vlasov *** ionization oscillation is *** oscillation amplitude and plasma density are compared with those obtained from a hybrid PIC *** comparison indicates that the hybrid Vlasov-fluid model yields noiseless results and that the steady-state waveform is calculable in a short time period.

关键词： Hall thruster ionization oscillation Vlasov equation semi-Lagrangian method

Dissipative structure for symmetric hyperbolic systems with memory

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Science China Mathematics 2018年第11期61卷 2053-2064页

作者： Shuichi kawashima Shogo Taniue Faculty of Mathematics Kyushu University Graduate School of Mathematics Kyushu University

We study symmetric hyperbolic systems with memory-type dissipation and investigate their dissipative *** treat two cases:memory-type diffusion and memory-type relaxation,and observe that the dissipative structures of these two cases are essentially ***,we show that the dissipative structure of the system with memory-type diffusion is of the standard type,while that of the system with memory-type relaxation is of the regularity-loss type.

关键词： hyperbolic systems memory-type dissipation dissipative structure

New Aspects in the Chemistry of Three-membered Ring Compounds Containing a Highly Coordinate Main Group Element

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Chinese Journal of Chemistry 2005年第9期23卷 1267-1269页

作者： TAKAYUKI kawashima Department of Chemistry Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113 Japan

The title compounds were synthesized by taking advantage of the Martin ligand. Their structures were determined by X-ray crystallography. Pentacoordinate thiasiliranides were hydrolyzed to give the corresponding thiol. Pentacoordinate chalcogenaphosphiranes were found to have polar P-chalcogen bonds, which were confirmed by their reactions with CF3SO3Me to give the corresponding 1-（methylchalcogena）alkylphosphonium triflates and by the solvent-dependent NMR studies.

关键词： Martin ligand P-chalcogen bond three-membered ring compound

Approaches to Stable Operation of Shaftless Centrifugal Pump

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Journal of Thermal Science 2009年第1期18卷 48-53页

作者： Ryunosuke kawashima Mitsuo Uno Toshiaki Kanemoto Department of mechanical engineering Kyushu Kyoritsu University 1-8 Jiyugaoka Faculty engineering Kyushu Institute of Technology

The shaft-less impeller of the centrifugal pump, which is driven by the magnetic induction, was developed. Theimpeller rotates under the floating condition without any control device. The floating condition of the impeller isrealized by utilizing the pressure in pump casing. The pump performance and the rotational behavior of the impellerwere investigated experimentally. It has found that the floating position of the impeller become quite unstablein a partial flow rate operation. And the pressure distribution at the casing wall affects the rotational posture ofthe impeller. This paper presents the effect of the casing treatment on the rotational posture of the impeller and thepressure distribution. The reasonable casing treatment is available for the stable rotational posture of the impeller.

关键词： Centrifugal pump Impeller Magnetic induction Casing treatment Passive control

Photodynamic Therapy of Cancer Cells with Methanesulfonate Salts of 5-Aminolevulinic Acid and Its Derivatives

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Chemical Research in Chinese Universities 2010年第1期26卷 66-69页

作者： QIU Xue-peng KOSOBE Toshiyuki kawashima Norimichi Faculty of Biomedical Engineering Toin University of Yokohama 1614 Kurogane-cho Aoba-ku Yokohama 225-8502 Japan Laboratory of Polymer Engineering Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

A series of 5-aminolevulinic acid and its alkylester methanesulfonates was exploited to photodynamic therapy（PDT） of human lymphocytic cells, U-937 in vitro. The PDT efficiency is influenced by the concentration and incubation time. Generally, for ALA and its alkylester methanesulfonates, the cell survival rate decreases and the accumulation ability of PplX increases with the concentration and incubation time. We found that the longer carbon chain methanesulfonates（C5-S, C6-S, C8-S） exhibit better PDT effect than ALA methanesulfonate. This possibly provides a promising route to the clinical application ofPplX-mediated PDT to cancer cell.

关键词： Photodynamic therapy Methanesulfonate salt 5-Aminolevulinic acid Derivative Cancer cell