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Takahashi, Kazuo,Wu, Mincharn,Nakazawa, Satoshi Techno-Press 1998 Structural Engineering and Mechanics, An Int'l Jou Vol.6 No.8
Vibration, buckling and dynamic stability of a cantilever rectangular plate subjected to an in-plane sinusoidally varying load applied along the free end are analyzed. The thin plate small deflection theory is used. The Rayleigh-Ritz method is employed to solve vibration and buckling of the plate. The dynamic stability problem is solved by using the Hamilton principle to drive time variables. The resulting time variables are solved by the harmonic balance method. Buckling properties and natural frequencies of the plate are shown at first. Unstable regions are presented for various loading conditions. Simple parametric resonances and combination resonances with sum type are obtained for various loading conditions, static load and damping.
Analysis of Local Vibrations in the Stay Cables of the Hizen-Takashima Bridge
Kazuo Takahashi,Kensuke Tanaka,Shozo Nakamura 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.4
Local parametric vibrations of the stay cables of the Hizen-Takashima Bridge, which is currently under construction, are studied. This bridge is a composite cable-stayed bridge with a steel girder and concrete towers. The natural frequencies of the global vibration modes are obtained using a three-dimensional FEM model. Relations between global natural frequencies and the local natural frequencies of the stay cables are first demonstrated and the results are compared with other cable-stayed bridges. The local vibrations of the stay cables at the support during global motion are obtained and the properties of the local vibrations are discussed. Local parametric vibrations of the stay cables of the Hizen-Takashima Bridge, which is currently under construction, are studied. This bridge is a composite cable-stayed bridge with a steel girder and concrete towers. The natural frequencies of the global vibration modes are obtained using a three-dimensional FEM model. Relations between global natural frequencies and the local natural frequencies of the stay cables are first demonstrated and the results are compared with other cable-stayed bridges. The local vibrations of the stay cables at the support during global motion are obtained and the properties of the local vibrations are discussed.
Masatoh Takahashi,Kazuo Ogura,Hiroyuki Yoshimura,Hiroshi Iiduka,Akira Sugawara,Kiyoyuki Yambe,김원섭 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
Experimental studies of coaxial oversized backward wave oscillators (BWOs) are presented. The beam voltage is weakly relativistic less than 100 kV. The slow-wave structure (SWS) consists of a rectangularly corrugated oversized hollow waveguide and rectangularly corrugated inner conductor, whose target operating frequency due to Cherenkov interaction is in the K-band. The coaxial SWS can have two surface waves caused by the inner and outer corrugations. The oversized BWO operations under the influences of two surface waves are examined. An oscillation starting voltage decreases by introducing the rectangularly corrugated inner conductor. Output powers increase greatly as compared with those without the corrugated inner conductor. The inner corrugation improves the oversized BWO operation
Stent-graft placement for treatment of massive hemobilia caused by porto-biliary fistula
Masao Takahashi,Yozo Sato,Kazuo Hara,Nozomi Okuno,Ikuo Dejima,Shinichi Murata,Takaaki Hasegawa,Shohei Chatani,Hiroaki Onaya,Yoshitaka Inaba 소화기인터벤션의학회 2019 Gastrointestinal Intervention Vol.8 No.4
Proton beam therapy is a type of radiation therapy and a promising modality for cancer management because it involves few adverse effects and high therapeutic efficacy. However, there are reports of acute and late complications because of normal tissue damage. Hemobilia, known as bleeding from the biliary tree, is observed in various conditions, and it can also be of iatrogenic origin such as due to percutaneous hepatobiliary interventions. In most cases, it can be managed conservatively without significant hemorrhage. However, in a few cases with massive hemobilia, further intervention is necessary. We report the successful use of a stent-graft in the portal vein to treat massive hemobilia with porto-biliary fistula that was caused by previous proton beam therapy.
Stent-graft placement for treatment of massive hemobilia caused by porto-biliary fistula
Masao Takahashi,Yozo Sato,Kazuo Hara,Nozomi Okuno,Ikuo Dejima,Shinichi Murata,Takaaki Hasegawa,Shohei Chatani,Hiroaki Onaya,Yoshitaka Inaba 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.4
Proton beam therapy is a type of radiation therapy and a promising modality for cancer management because it involves few adverse effects and high therapeutic efficacy. However, there are reports of acute and late complications because of normal tissue damage. Hemobilia, known as bleeding from the biliary tree, is observed in various conditions, and it can also be of iatrogenic origin such as due to percutaneous hepatobiliary interventions. In most cases, it can be managed conservatively without significant hemorrhage. However, in a few cases with massive hemobilia, further intervention is necessary. We report the successful use of a stent-graft in the portal vein to treat massive hemobilia with porto-biliary fistula that was caused by previous proton beam therapy.
[New insights into the pathogenesis of neuromyelitis optica]
Misu, Tatsuro,Takahashi, Toshiyuki,Nishiyama, Shuhei,Takano, Rina,Nakashima, Ichiro,Fujihara, Kazuo,Itoyama, Yasuto 醫學書院 2010 Brain and nerve Vol.62 No.9
<P>Recently, the disease-specific antibody was found in the sera from neuromyelitis optica (NMO) patients, and its target was identified as aquaporin-4 (AQP4), mainly expressed in astroglial foot processes. In our immunohistochemical studies, loss of AQP4 and glial fibrillary acidic protein (GFAP) was evident in about 90% of NMO lesions, especially in perivascular areas of acute inflammatory lesions where immunoglobulins and complements were deposited. In contrast, myelin basic protein (MBP)-stained myelinated fibers were relatively preserved in those lesions, which probably suggested the secondary damage of myelin sheaths following astrocytic damage. Recently, there are developing evidences of the effect of AQP4 antibody in vitro or in vivo. In HEK293 cells transfected with AQP4, AQP4 antibody could bind to the membrane AQP4, and induced the degradation and endocytosis of AQP4 in complement-dependent manner. In vitro experiments by primary cultured astrocytes, AQP4 antibody had cytotoxic effects with complement, and also could impair the astrocytic function such as the maintenance of the blood brain barrier or glutamate homeostasis. In vivo study, the lesions lacking AQP4 and GFAP was appeared by passive-transferred Lewis rats with human purified IgG from NMO patients. Furthermore, in cerebrospinal fluid (CSF) biomarker study, astrocytic damage reflected by marked increase of CSF-GFAP, far severe than demyelination (CSF-MBP), was evident in NMO but not in classical multiple sclerosis (MS). These evidences suggested the pathogenic role of AQP4 antibody with astrocytopathy in NMO. Now it is indispensable to check the AQP4 antibody,and is important to reconsider the role of astrocyte in demyelinating disorders.</P>
Wu, Qingxiong,Takahashi, Kazuo,Chen, Baochun Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.30 No.1
This paper focuses on the nonlinear vibrations of stay cables and evaluates the dynamic characteristics of stay cables by using the nonlinear enhanced MECS approach and the approximate approach. The nonlinear enhanced MECS approach is that both the girder-tower vibrations and the cable vibrations including parametric cable vibrations are simultaneously considered in the numerical analysis of cable-stayed bridges. Cable finite element method is used to simulate the responses including the parametric vibrations of stay cables. The approximate approach is based on the assumption that cable vibrations have a small effect on girder-tower vibrations, and analyzes the local cable vibrations after obtaining the girder-tower responses. Under the periodic excitations or the moderate ground motion, the differences of the responses of stay cables between these two approaches are evaluated in detail. The effect of cable vibrations on the girder and towers are also discussed. As a result, the dynamic characteristics of the parametric vibrations in stay cables can be evaluated by using the approximate approach or the nonlinear enhanced MECS approach. Since the different axial force fluctuant of stay cables in both ends of one girder causes the difference response values between two approach, it had better use the nonlinear enhanced MECS approach to perform the dynamic analyses of cable-stayed bridges.