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Exact Bosonic Solutions of the Truncated Skyrme Model

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Chinese Physics Letters 2010年第6期27卷 35-36页

作者： SHI Chang-Guang hirayama Minoru Department of Mathematics and Physics Shanghai University of Electric Power Shanghai 200090 Department of Physics University of Toyama Gofuku 3190 Toyama Japan

A model defined by half the Lagrangian （the highly nonlinear part） of the Skyrme model is investigated. Two classes of bosonic solutions are obtained. It is shown that, although the field configurations of these two... 详细信息

关键词： SKyRME model BOSONS LAGRANGE equations FIELD theory (Physics) MATHEMATICAL physics FORCE & energy

Degradation of dibromophenols by UV irradiation

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Journal of Environmental Sciences 2014年第6期26卷 1284-1288页

作者： Keiko Katayama-hirayama Naoki Toda Akihiko Tauchi Atsushi Fujioka Tetsuya Akitsu Hidehiro Kaneko Kimiaki hirayama Interdisciplinary Graduate School of Medicine and Engineering University of Yamanashi 4-3-11 Takeda Kofu 400-8511 Japan Technology Development Division Toshiba Lighting and Technology Corporation Asahimachi 5-2-1 Imabari Ehime 794-8510 Japan

We examined the degradation of dibromophenols （DBPs）, i.e. 2,4-DBP, 2,6-DBP and 3,5-DBP by ultraviolet （UV） irradiation and estimated the relationship between degradability and molecular orbital properties of each dibromopbenol. The removal of DBPs under a UV lamp system was successfully performed in an aqueous solution. After 5 min of irradiation, the initial DBPs concentration of 20 mg/L was decreased to below 1 mg/L, and about 60% of bromide ion was released. A decrease in the concentration of dissolved organic carbon （DOC） suggested the mineralization of DBPs, The mineralization may occur after release of bromide ions because the decrease of DOC was slower than the release of bromide ions. The degradability of 3,5-DBP was slightly lower than 2,6-DBP and 2,4-DBE Molecular orbital calculation suggested that the electrophilic frontier density and the highest occupied molecular orbital （HOMO） energy may be related to the degradability of DBPs.

关键词： bromide ion dibromophenol DOC mineralization UV irration

Significant Deviations in the Configurations of Homologous Tandem Repeats in Prokaryotic Genomes

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Genomics, Proteomics & Bioinformatics 2009年第4期7卷 163-174页

作者： Shintaro hirayama Satoshi Mizuta Graduate School of Science and Technology Hirosaki University

We explored the possibilities of whole-genome duplication （WGD） in prokaryotic species, where we performed statistical analyses of the configurations of the central angles between homologous tandem repeats （TRs） on the circular chromosomes. At first, we detected TRs on their chromosomes and identified equivalent tandem repeat pairs （ETRPs）; here, an ETRP is defined as a pair of tandem repeats sequentially similar to each other. Then we carried out statistical analyses of the central angle distributions of the detected ETRPs on each circular chromosome by way of comparisons between the detected distributions and those generated by null models. In the analyses, we estimated a P value by a simulation using the Kullback-Leibler divergence as a distance measure between two distributions. As a result, the central angle distributions for 8 out of the 203 prokaryotic species showed statistically significant deviations （P〈0.05）. In particular, we found out the characteristic feature of one round of WGD in Photorhabdus luminescens genome and that of two rounds of WGD in Escherichia coli K12.

关键词： whole-genome duplication statistical analysis tandem repeat Kullback-Leibler divergence prokaryote

Atomic force microscopy imaging of dialyzed single-walled carbon nanotubes dispersed with sodium dodecyl sulfate

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International Journal of Smart and Nano Materials 2013年第2期4卷 119-127页

作者： Shigeyuki hirayama Takuya Hayashida Kazuo Umemura Biophysics Section Department of PhysicsFaculty of ScienceTokyo University of Science1-3 KagurazakaShinjukuTokyo 1628601Japan

The existence of excess sodium dodecyl sulfate(SDS)molecules in a single-walled carbon nanotube(SWNT)solution dispersed by hybridization with SDS leads to unstable atomic force microscopy(AFM)*** this study,we demonstrate sequential dialysis against pure water in order to remove excess SDS molecules from an SDS-SWNT hybrid dispersion.A 1:102 volume ratio of SDS-SWNT dispersion to water in the dialysis was found to be effective in realizing stable AFM observations of the SDS-SWNT hybrids despite imperfect filtering of SDS via *** the other hand,the SDS-SWNT hybrids were stable even when this volume ratio was 1:***,the SDS-SWNT hybrids were present in the solution even when the dialyzed samples were stored for 14 *** results reveal that dialysis under optimal conditions enables improved handling of SDS-SWNT hybrids,particularly for stable AFM observations.

关键词： carbon nanotube atomic force microscopy sodium dodecyl sulfate dialysis

Nanotwin-assisted nitridation of quenched FeNi alloy nanopowders for rare-earth-free magnets

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Journal of Materials Science & Technology 2023年第34期165卷 244-252页

作者： Jian Wang yusuke hirayama Kazuyuki Suzuki Kwangjae Park Zheng Liu Kenta Takagi Kimihiro Ozaki Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology4-205SakurazakaMoriyamaNagoya463-8560Japan

L1_(0)-ordered FeNi alloy with a high uniaxial magnetic anisotropy and large magnetic moment is a promising candidate for rare-earth-free permanent magnets ***,the synthesis of this chemically ordered phase remains a longstanding challenge because of its low chemical order-disorder transition temperature(200-320℃).Although a non-equilibrium synthetic route based on a nitrogen topotactic reaction has been proposed as a valid approach,the volume fraction and degree of chemical ordering of the product phase are ***,we propose a promising approach that promotes the efficient formation of L1_(0)-ordered nitride phase in FeNi nanopowders by introducing a quenching treatment during a low-oxygen induction thermal plasma *** quenched FeNi nanopowders possessed much smaller powder sizes(40.4 vs 74.0 nm),exhibited higher number densities of nanotwins(39.8%vs 24.1%)and formed much larger volume fraction(33.6 wt.%vs 0.6 wt.%)of ordered phase than the unquenched ***,quenching-induced high-density nanotwins led to the dominant coverage of serrated{001}crystal facets over the surfaces of the FeNi *** unique features substantially accelerated the formation of the L1_(0)-ordered nitride phase in the FeNi nanopowders because the{001}crystallographic orientation had the highest nitrogen *** work provides not only a valid synthetic approach for mass production of the L10-ordered nitride phase in FeNi nanopowders but also novel insights into the crystal-defect-assisted nitridation of nanomaterials.

关键词： Rare-earth-free Permanent magnet FeNi Nitridation Nanotwin

Complete response to multidisciplinary therapy in a patient with primary gastric choriocarcinoma

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World Journal of Gastroenterology 2013年第31期19卷 5187-5194页

作者： Kazuhiro Takahashi Shigeki Tsukamoto Ken Saito Nobuhiro Ohkohchi Katsu hirayama Division of Gastro-enterological and Hepatobiliary Surgery and Organ Transplantation Department of Surgery University of Tsukuba Tsukuba 3058575 Japan Department of Surgery Hiraka General Hospital Yokote 0138610 Japan

Primary gastric choriocarcinoma is a rapidly growing neoplasm with an average survival of several months in untreated *** with lymph node dissection followed by chemotherapy is the treatment of *** used for gastric adenocarcinoma are usually ***,median survival remains less than six *** this case report,we describe a case of primary gastric choriocarcinoma with a clinical complete response to multidisciplinary treatment including surgery,chemotherapy,and radiofrequency ablation(RFA).The patient was originally referred for general *** demonstrated a large tumor occupying the fornix,and total gastrectomy with lymph node dissection was *** days later,multiple liver metastatic recurrences with high serum levels of beta-human chorionic gonadotropin(β-hCG) were *** with a gonadal choriocarcinoma regimen consisting of etoposide,methotrexate,actinomycin D,cyclophosphamide,and vincristine(EMA/CO),was *** three cycles,serum β-hCG decreased markedly and the tumors *** months later,multiple lung metastatic recurrences were *** one cycle of EMA/CO,only one nodule *** tomography-guided RFA was performed for this oligometastatic *** patient has been alive with no evidence of disease for 10 years after the initial *** the best of our knowledge,this patient with recurrent primary gastric choriocarcinoma has achieved the longest *** present case is the first report of choriocarcinoma metastatic to the lung successfully treated with *** our retrospective analysis of recurrent or unresectable primary gastric choriocarcinoma,we propose that gonadal choriocarcinoma regimens can be considered as first-line for primary gastric choriocarcinoma.

关键词： Primary gastric choriocarcinoma Betahuman chorionic gonadotropin Etoposide,methotrexate,actinomycin D,cyclophosphamide,and vincristine Oligometastatic Radiofrequency ablation

A new scorpion polypeptide enhances the binding of radiolabeled-ryanodine on ryanodine receptor in sarcoplasmic reticulum of rabbit skeletal muscle

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Chinese Science Bulletin 1997年第2期42卷 147-151页

作者： Seiko Kawano yoshiyuki hirayama Masayasu Hiraoka Akihiko Kuniyasu Hitoshi Nakayama Department of Cardiovascular Diseases M R 1 Tokyo Medical and Dental University JapanDepartment of Cardiovascular Diseases M R 1 Tokyo Medical and Dental University JapanDepartment of Cardiovascular Diseases M R 1 Tokyo Medical and Dental University JapanFaculty of Pharmaceutical Science Hokkaido University Japan Faculty of Pharmaceutical Science Kumamoto University Japan

RyANODINE is a toxic alkaloid from the plant Ryania speciosa Vahl. It selectively binds to the Ca2+ release channel on skeletal and cardiac heavy sarcoplasmic reticulum （HSR） and has

关键词： scorpion Buthus martensi Karsch ryanodine receptor toxic polypeptide.

Steering performance of an inverted pendulum vehicle with pedals as a personal mobility vehicle

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Theoretical & Applied Mechanics Letters 2013年第1期3卷 71-76页

作者： Chihiro Nakagawa Kimihiko Nakano yoshihiro Suda yuki hirayama Mechanical Engineering Osaka Prefecture University Interdisciplinary Information Studies University of Tokyo Institute of Industrial Science University of Tokyo

From the viewpoints of environmental protection, support for the aged and ensuring the right to mobility, there is a need to develop a new type of mobility vehicle that provides more effective transportation. The authors propose an inverted pendulum vehicle with pedals as one of the forms of personal mobility vehicles （PMVs）. In this paper, the steering performance of the inverted pendulum vehicle with pedals is discussed based on experiments on a prototype. From the experimental results, it was confirmed that the errors from the five subjects for the target trajectory and the five-grade evaluation of the maneuverability were similar. Finally, we created an inverted pendulum vehicle with pedals to which was added a reaction actuator for the steering system. From the experimental results, it was found that setting appropriate feedback gains for the handle steering angle and its rate of rotation, which control the right and left wheel driving torques, resulted in greatly improved maneuverability. C 2013 The Chinese Society of Theoretical and Applied Mechanics. [doi：10.1063/2.1301309]

关键词： steering control stability inverted pendulum vehicle

Case of colonic intussusception secondary to mobile cecum syndrome repaired by laparoscopic cecopexy using a barbed wound suture device

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World Journal of Gastroenterology 2017年第35期23卷 6534-6539页

作者： Tetsu yamamoto yoshitsugu Tajima Ryoji Hyakudomi Takanori hirayama Takahito Taniura Kazunari Ishitobi Noriyuki Hirahara Department of Digestive and General Surgery Shimane University Faculty of Medicine

A 27-year-old man with recurrent right lower quadrant pain was admitted to our hospital. Ultrasonography and computed tomography examination of the abdomen revealed a target sign in the ascending colon, which was compatible with the diagnosis of cecal intussusception. The intussusception was spontaneously resolved at that time, but it relapsed 6 mo later. The patient underwent a successful colonoscopic disinvagination; there was no evidence of neoplastic or inflammatory lesions in the colon and terminal ileum. The patient underwent laparoscopic surgery for recurring cecal intussusception. During laparoscopy, we observed an unfixed cecum on the posterior peritoneum(i.e. a mobile cecum). Thus, we performed laparoscopic appendectomy and cecopexy with a lateral peritoneal flap using a barbed wound suture device. The patient's post-operative course was uneventful, and he continued to do well without recurrence at 10 mo after surgery. Laparoscopic cecopexy using a barbed wound suture device is a simple and reliable procedure that can be the treatment of choice for recurrent cecal intussusception associated with a mobile cecum.

关键词： Colonic intussusception Adult Mobile cecum Cecopexy Barbed wound suture device