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Effects of uniaxial compressive strain on the electronic- transport properties of zigzag carbon nanotubes

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Nano Research 2016年第5期9卷 1267-1275页

作者： masato Ohnishi Ken Suzuki Hideo Miura Fracture and Reliability Research Institute Graduate School of Engineering Tohoku University Sendai 980-8579 Japan

Recently, substantial attention has been paid to the strain sensitivity of the carbon nanotubes＇（CNTs＇） electronic properties. In this study, the relationships between the geometric structures and electronic states of zigzag CNTs under uniaxial compressive strain were investigated. We found that different factors dominate the electronic states of zigzag CNTs depending on the strain regions： the initial stage of the strain loading, which lasts until column-buckling deformation begins, and the strain regions corresponding to column- and shell-buckling deformations. Because shell-buckling deformation significantly increases the re-orbital angle, the angle between the π orbital axis vectors of adjacent atoms, strong localization of the density of states （LDOS） occurs in the buckled area. We also analyzed the current able to pass through deformed CNTs using a tight-binding-based Green＇s function approach and determined that the current can be significantly suppressed by applying uniaxial compressive strain. Our method of predicting the electronic state of a deformed CNT based on the π-orbital angle is expected to be useful for predicting the electronic properties of CNT-based electronic devices and sensors.

关键词： carbon nanotube strain buckling deformation Green's function method electronic-transport property

Lessons from tenascin-C knockout mice and potential clinical application to subarachnoid hemorrhage

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Neural Regeneration Research 2019年第2期14卷 262-264页

作者： masato Shiba Hidenori Suzuki Department of Neurosurgery Mie University Graduate School of Medicine

Subarachnoid hemorrhage by a ruptured cerebral aneurysmremains the most devastating cerebrovascular disorderswith high morbidity and mortality (Suzuki et al.,2017), which are mainly caused by early brain injury anddelayed cerebral ischemia. Despite many experimentaland clinical research efforts, the mechanisms of earlybrain injury as well as delayed cerebral ischemia remainunclarified. However, recent works have suggested thattenascin-C, which is a special type of secreted extracellularmatrix proteins, is promising as a novel therapeutictarget against post-subarachnoid hemorrhage early braininjury and delayed cerebral ischemia.

关键词： cerebral clinical ischemia hemorrhage

Collective Hamiltonian for Multi-O（4） Model

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Communications in Theoretical Physics 2007年第2期47卷 309-316页

作者： GU Jian-Zhong masato Kobayasi China Institute of Atomic Energy P.O. Box 275 （18） Beijing 102413 China Department of Physics Graduate School of Science Kyoto University Kyoto 606-8502 Japan Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan

The collective Bamiltonian up to the fourth order for multi-O（4） model is derived based on the self-consistent collective-coordinate （SCC） method, which is formulated in the framework of the time-dependent Hartree-Bogoliubov （TDHB） theory. The validity of the collective Hamiltonian is checked in the two special cases of the multi-O（4） model： the case where the number of the shells is equal to one （a single j-shell case）, and the case where the Hartree-Bogoliubov equilibrium point is spherical （the spherical case）. The collective Hamiltonian constitutes a good starting point to study nuclear shape coexistence.

关键词： self-consistent collective-coordinate method multi-O(4) model time-dependent Hartree-Bogoliubov theory collective Hamiltonian

Perihilar cholangiocarcinoma:a surgeon's perspective

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iLIVER 2022年第1期1卷 12-24页

作者： masato Nagino Department of Gastroenterological Surgery Aichi Cancer Center1-1 KanokodenChikusa-kuNagoya464-8681Japan

Perihilar cholangiocarcinoma(PHC)is defined anatomically as tumors located in the extrahepatic biliary tree proximal to the origin of the cystic ***,as the boundary between the extrahepatic and intrahepatic bile ducts is not well defined,PHC potentially includes two types of tumors:one is the extrahepatic type,which arises from the large hilar bile duct,and the other is the intrahepatic type,which has an intrahepatic component with invasion of the hepatic *** new American Joint Commission on Cancer tumor-node-metastasis staging system for PHC was well revised;an important revision is that the Bismuth type IV was removed from T4 stage *** patients with PHC present with obstructive jaundice,and preoperative biliary drainage is ***,percutaneous transhepatic biliary drainage was used in many centers;however,it has been accepted that endoscopic nasobiliary drainage is the most suitable method for ***,inside-stents have also been adopted for biliary drainage,with favorable *** vein embolization is widely performed as presurgical treatment for patients undergoing extended hepatectomy to minimize postoperative liver *** resection of PHC is technically demanding and continues to be the most difficult challenge for hepatobiliary *** of advances in diagnostic and surgical techniques,surgical outcomes and survival rates after resection have steadily ***,survival rates,especially for patients with lymph node metastasis,are unsatisfactory,and establishing a protocol for effective adjuvant chemotherapy is an urgent *** synergy of endoscopists,radiologists,oncologists,and surgeons is required to conquer this intractable disease.

关键词： Perihilar cholangiocarcinoma Biliary drainage Portal vein embolization Extended surgery

Angiogenesis and neuronal remodeling after ischemic stroke

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Neural Regeneration Research 2020年第1期15卷 16-19页

作者： Masahiro Hatakeyama Itaru Ninomiya masato Kanazawa Department of Neurology Brain Research Institute Niigata University

Increased microvessel density in the peri-infarct region has been reported and has been correlated with longer survival times in ischemic stroke patients and has improved outcomes in ischemic animal *** raises the possibility that enhancement of angiogenesis is one of the strategies to facilitate functional recovery after ischemic *** vessels and neuronal cells communicate with each other using various mediators and contribute to the pathophysiology of cerebral ischemia as a *** this mini-review,we discuss how angiogenesis might couple with axonal outgrowth/neurogenesis and work for functional recovery after cerebral *** occurs within 4 to 7 days after cerebral ischemia in the border of the ischemic core and ***-ischemic angiogenesis may contribute to neuronal remodeling in at least two ways and is thought to contribute to functional ***,new blood vessels that are formed after ischemia are thought to have a role in the guidance of sprouting axons by vascular endothelial growth factor and laminin/β1-integrin ***,blood vessels are thought to enhance neurogenesis in three stages:1)Blood vessels enhance proliferation of neural stem/progenitor cells by expression of several extracellular signals,2)microvessels support the migration of neural stem/progenitor cells toward the peri-infarct region by supplying oxygen,nutrients,and soluble factors as well as serving as a scaffold for migration,and 3)oxygenation induced by angiogenesis in the ischemic core is thought to facilitate the differentiation of migrated neural stem/progenitor cells into mature ***,the regions of angiogenesis and surrounding tissue may be coupled,representing novel treatment targets.

关键词： angiogenesis axonal outgrowth cerebral ischemia coupling functional recovery guidance neurogenesis stroke

Optimal calibration scheme for map-based control of diesel engines

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Science China(Information Sciences) 2018年第7期61卷 68-81页

作者： Yui NISHIO Yutaka MURATA Yukihisa YAMAYA masato KIKUCHI Automobile R & D Center Honda R & D Co. Ltd.

Map-based control has the advantage of a simple control structure. However, in the case of a complex plant, calibrating the map is difficult. Calibration methodology using plant model is increasing in engine calibration industries. However, the models are for steady-state operation and cannot simulate at transient operation well. This study introduces the dynamic empirical model and applies the transient corrective function of an electronic control unit to simulate more realistic behavior. The optimization problem for calibrating maps of diesel engines is constructed, and the formulation of cost function and constraints is discussed. Consequently, the proposed calibration scheme can find an optimal map in satisfied ***, the optimized maps are validated using mass production diesel engines.

关键词： optimization Gaussian SQP Diesel engine calibration DoE

Vertical impedance functions of pile groups under low-to-high loading amplitudes:numerical simulations and experimental validation

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 647-666页

作者： Usama Zafar Chandra Shekhar Goit masato Saitoh Riku Fukuda School of Science and Engineering Saitama University255 Shimo-OkuboSaitamaJapan

Piles in a group experience additional displacements in soil due to pile-to-pile interactions apart from those resulting from the external *** effect of these interactions determined assuming soil as an elastic and/or viscoelastic material on pile head impedance functions of the pile group is studied by relating the group stiffness to the static stiffness of a single ***,the prevailing elastic solutions may misestimate the resulting pile group response due to the lack of consideration for either soil(material)and/or soil-pile interface *** is well established that soil behaves nonlinearly under moderate-to-high loading amplitudes,and besides,the soil-pile interface nonlinearity can exist even at small loading *** study addresses the effects of these nonlinearities on the vertical impedance functions of a 3×3-pile group using numerical methods by direct analyses and superposition using pile-to-pile interaction *** numerical results are validated using scaled model tests under 1 g *** results highlight the overestimation of pile-to-pile interactions in the pile group when assuming elastic soil *** cases either by direct analyses or superposition approach involving soil and soil-pile interface nonlinearities agree well with the experimental pile group responses under close-to-elastic and nonlinear conditions.

关键词： impedance functions numerical simulations model-scale experiment superposition approach soil-pile interface nonlinearity

Is germinal center selection required for influenza vaccination?

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Cellular & Molecular Immunology 2017年第8期14卷 655-657页

作者： Kosuke Miyauchi masato Kubo Laboratory for Cytokine Regulation Research Center for Integrative Medical Science(IMS)RIKEN Yokohama InstituteYokohamaKanagawa 230-0045Japan Division of Molecular Pathology Research Institute for Biomedical ScienceTokyo University of ScienceNodaChiba 278-0022Japan

It has long been believed that the generation of high-affinity neutralizing antibodies is critical for antiviral humoral *** production of high-affinity antibodies depends on the formation of germinal centers(GC)in ly... 详细信息

关键词： centers center neutral

Effect of diethylstilbestrol on polyamine metabolism in hamster epididymis

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Asian Journal of Andrology 2003年第4期5卷 301-306页

作者： masato Ohe Shigeru Matsuzaki Department of Biochemistry Dokkyo University School of Medicine Mibu 321-0293 Tochigi JapanDepartment of Biochemistry Dokkyo University School of Medicine Mibu 321-0293 Tochigi Japan

Aim: To investigate the effect of diethylstilbestrol (DES), one of the most potent endocrine disruptors, on the metabolism of polyamines in hamster epididymis. Methods: Male golden hamsters of 7-week-old were kept under a light and dark cycle of 14 h and 10 h for 1 week to stimulate maximally the gonadal function. DES was injected subcutaneously at doses of 0.01 mg·kg-1·day-1, 0.1 mg·kg-1·day-1 and 1 mg·kg-1·day-1 for one week. Results: DES treatment caused a significant decrease in the weight of epididymis. The activity of epididymal ornithine decar boxylase (ODC) increased 1 day after DES treatment, kept at a high level for 4 days and then decreased to nearly normal level at day 7. The activity of spermidine/spermine N1-acetyltransferase (SSAT) also increased transiently after DES treatment. The contents of putrescine, spermidine, spermine and N1-acetylspermidine were increased 1 day -4 days after DES treatment and restored to normal at day 7. All these changes showed a marked difference between the caput and the cauda. Conclusion: The polyamine biosynthesis in the hamster epididymis can be affected by DES, a xenoestrogen. DES may probably affect polyamine metabolism in the epididymis by regulating the rate-limiting enzymes involved in the polyamine biosynthesis.

关键词： diethylstilbestrol polyamines ornithine decarboxylase spermidine/spermine N1-acetyltransferase