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Electronic structure and exotic exchange splitting in spin-density-wave states of BaFe2As2

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Electronic structure and exotic exchange splitting in spin-d...

Electronic structure, Dirac points and Fermi arc surface states in three-dimensional Dirac semimetal Na_3Bi from angle-resolved photoemission spectroscopy

中国真空学会2008年学术年会

作者： m.arita K.Shimada m.Taniguchi

The magnetic properties in the parent compounds are often intimately related to the microscopic mechanism of *** we report the first direct measurements on the electronic structure of a parent compound of the newly discovered iron-based superconductor,BaFe2As2,which provides a foundation for further *** show that the energy of the spin density wave (SDW) in BaFe2As2 is lowered through exotic exchange splitting of the band structure,rather than Fermi surface nesting of itinerant *** clearly demonstrates that a metallic SDW state could be solely induced by interactions of local magnetic moments,resembling the nature of antiferromagnetic order in cuprate parent compounds.

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Chinese Physics B 2016年第7期25卷 76-88页

作者：梁爱基陈朝宇王志俊石友国冯娅伊合绵谢卓晋何少龙何俊峰彭莹莹刘艳刘德发胡成赵林刘国东董晓莉张君 m Nakatake H Iwasawa K Shimad m arita H Namatame m Taniguchi 许祖彦陈创天翁红明戴希方忠周兴江 Beijing National Laboratory for Condensed matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Hiroshima Synchrotron Radiation Center Hiroshima University 2-313 Kagamiyama Higashi-Hiroshima City 739-0046 Japan Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum matter Beijing China

The three-dimensional（3D） Dirac semimetals have linearly dispersive 3D Dirac nodes where the conduction band and valence band are connected. They have isolated 3D Dirac nodes in the whole Brillouin zone and can be viewed as a 3D counterpart of graphene. Recent theoretical calculations and experimental results indicate that the 3D Dirac semimetal state can be realized in a simple stoichiometric compound A3Bi（A = Na, K, Rb）. Here we report comprehensive high-resolution angle-resolved photoemission（ARPES） measurements on the two cleaved surfaces,（001） and（100）, of Na3Bi. On the（001） surface, by comparison with theoretical calculations, we provide a proper assignment of the observed bands, and in particular, pinpoint the band that is responsible for the formation of the three-dimensional Dirac cones. We observe clear evidence of 3D Dirac cones in the three-dimensional momentum space by directly measuring on the kx–ky plane and by varying the photon energy to get access to different out-of-plane kzs. In addition, we reveal new features around the Brillouin zone corners that may be related with surface reconstruction. On the（100） surface, our ARPES measurements over a large momentum space raise an issue on the selection of the basic Brillouin zone in the（100） plane. We directly observe two isolated 3D Dirac nodes on the（100） surface. We observe the signature of the Fermi-arc surface states connecting the two 3D Dirac nodes that extend to a binding energy of ~150 me V before merging into the bulk band. Our observations constitute strong evidence on the existence of the Dirac semimetal state in Na3Bi that are consistent with previous theoretical and experimental work. In addition, our results provide new information to clarify on the nature of the band that forms the3 D Dirac cones, on the possible formation of surface reconstruction of the（001） surface, and on the issue of basic Brillouin zone selection for the（100） surface.

关键词： Dirac semimetal Na3Bi photonemission surface state

In Vitro mitral Simulator to Evaluate Effectiveness of Valvoplasty Technique

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上海大学学报（自然科学版） 2004年第B10期10卷 29-31页

作者： H.Doi m.arita m.Okuda R.Noda K.Iwasaki T.Tanaka H.Kasegawa m.Umezu IntegrativeBioscienceandBiomedicalEngineering GraduateSchoolofWasedaUniversityTokyoJapan YasuhisaBiomechanics TokyoJapan HanzomonCardiovascularClinic TokyoJapan

The edge-to-edge technique is one of the surgical procedures for anterior mitral leaflet prolapse. The purpose of this study is to evaluate the effect of this technique by using an in vitro mitral simulator. The resul... 详细信息

关键词：二尖瓣模拟外科技术吻合技术计算机模拟

Biomedical Engineering Approach to Evaluate Anastomosis methods for Coronary Artery Bypass Grafting

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Biomedical Engineering Approach to Evaluate Anastomosis Meth...

Biomedical Engineering Approach to Evaluate Anastomosis methods for Coronary Artery Bypass Grafting

2004年生命系统建模仿真国际会议暨第一届全国生命系统...

作者： m.Umezu J.Kawai J.Suehiro m.arita Y.Shiraishi K.Iwasaki T.Tanaka H.Niinami Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Integrative Bioscience and Biomedical Engineering Graduate School of Waseda University Tokyo Japan Yasuhisa Biomechanics Inc. Tokyo Japan Dept. of Cardiovascular Surgery Juntendo Medical University Tokyo Japan

＜正＞There are two different methods for coronary artery bypass grafting: end-to-side and side-to-side anastomosis. In vitro mock test, flow visualization and animal experiments were performed in parallel to compare the hemodynamic effect between two methods. Thus, bioengineers can provide practical useful information to the clinical team.

关键词： coronary artery bypass grafting coronary simulator side-to-side anastomosis flow visualization

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上海大学学报（自然科学版） 2004年第B10期10卷 25-28页

There are two different methods for coronary artery bypass grafting: end-to-side and side-to-side anastomosis. In vitro mock test, flow visualization and animal experiments were performed in parallel to compare the hemodynamic effect between two methods. Thus, bioengineers can provide practical useful information to the clinical team.

关键词：生物医学工程接合方法冠状动脉分流嫁接法面对面接合冠心病

Optical trapping with structured light: a review

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Advanced Photonics 2021年第3期3卷 4-43页

作者： Yuanjie Yang Yu-Xuan Ren mingzhou Chen Yoshihiko arita Carmelo Rosales-Guzmán University of Electronic Science and Technology of China School of PhysicsChengduChina University of Hong Kong Department of Electrical and Electronic EngineeringHong Kong SARChina University of St Andrews SUPASchool of Physics and AstronomySt AndrewsUnited Kingdom Chiba University Molecular Chirality Research CenterChibaJapan Centro de Investigaciones enÓptica A.C.LeónGuanajuatoMexico Harbin University of Science and Technology Wang Da-Heng Collaborative Innovation Center for Quantum Manipulation and ControlHarbinChina

Optical trapping describes the interaction between light and matter to manipulate micro-objects through momentum *** the case of 3D trapping with a single beam,this is termed optical *** tweezers are a powerful and noninvasive tool for manipulating small objects,and have become indispensable in many fields,including physics,biology,soft condensed matter,among *** the early days,optical trapping was typically accomplished with a single Gaussian *** recent years,we have witnessed rapid progress in the use of structured light beams with customized phase,amplitude,and polarization in optical *** beam properties,such as phase singularities on-axis and propagation invariant nature,have opened up novel capabilities to the study of micromanipulation in liquid,air,and *** summarize the recent advances in the field of optical trapping using structured light beams.

关键词： optical trapping structured beams vortex beam optical angular momentum.

Diameter measurements of the Upper Parts of Trees Using an Ultra-Telephoto Digital Photography System

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Open Journal of Forestry 2014年第4期4卷 316-326页

作者： Akira Shimizu Shigeki Yamada Yuichiro arita Forestry and Forest Products Research Institute Tsukuba Japan Kyushu Research Centre Forestry and Forest Products Research Institute Kumamoto Japan Ogunimachi Forestry Cooperative Oguni-Machi Japan

We develop a new technique to measure the exact upper diameters of trees that is comparatively simple and inexpensive. We can measure the diameters of entire tree trunks efficiently and with high precision. The system uses a digital camera with a ~15 - 30× telephoto lens to take a photograph that can be used for measuring the diameter of the upper part of a comparatively slender tree trunk. Since this method requires a measuring distance and the height of the target point in the image, a range finder capable of measuring angles was combined with the main digiscoping system. A range finder sensor uses a laser and makes a 360 degree angle of observation possible. The diameter of a target position of the objective tree can be obtained by measuring the digital image using image editing software and calculations from spreadsheet software. We focus on the Japanese cedar species in the southwestern part of Japan. Photographic measurements were obtained prior to thinning. The estimates that we obtained largely agree with the true measurements of all trees. With regard to the estimated accuracy of all measured trees, the maximum error ratio was 7.0% (1.45 cm), with a ~2% - 4% error for most of the estimated results. Although the absolute value of the estimation error was 1.87 cm (5.3%) at the maximum (9.87 m in height and 35.5 cm in diameter), an estimation accuracy of m was reproduced in almost all measurements except for the extreme hypertrophy portion by butt swelling.

关键词： Digital Camera Image Editing Software magnifications Spotting Scope Taper Curve Upper Diameter

Electronic Structure Reconstruction across the Antiferromagnetic Transition in TaFe1.23Te3 Spin Ladder

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Chinese Physics Letters 2015年第2期32卷 127-130页

作者：徐敏王莉敏彭瑞葛青亲陈飞叶子荣张焱陈苏迪夏淼刘荣华 arita m. Shimada K. Namatame H. Taniguchi m. matsunami m. Kimura S. 史明陈仙辉尹卫国顾威谢斌平封东来 State Key Laboratory of Surface Physics Department of Physicsand Advanced Materials LaboratoryFudan University Condensed matter Physics and materials Science Department Brookhaven National Laboratory Collaborative Innovation Center of Advanced microstructures Hefei National Laboratory for Physical Sciences at microscale and Department of Physics University of Science and Technology of China Hiroshima Synchrotron Radiation Center Hiroshima University UVSOR Facility Institute for Molecular Science Swiss Light Source Paul-Scherrer Institute

Employing the angle-resolved photoemission spectroscopy, we study the electronic structure of TaFe1.23Te3, a two-leg spin ladder compound with a novel antiferromagnetic ground state. Quasi-two-dimensional （2D） Fermi surface is observed, with sizable inter-ladder hopping. moreover, instead of observing an energy gap at the Fermi surface in the antiferromagnetic state, we observe the shifts of various bands. Combining these observations with density-functional-theory calculations, we propose that the large scale reconstruction of the electronic structure, caused by the interactions between the coexisting itinerant electrons and local moments, is most likely the driving force of the magnetic transition. Thus TaFe1.23Te3 serves as a simpler platform that contains similar ingredients to the parent compounds of iron-based superconductors.

关键词： Ta der Electronic Structure Reconstruction across the Antiferromagnetic Transition in TaFe AFm

Chemoradiotherapy with twice-weekly administration of low-dose gemcitabine for locally advanced pancreatic cancer

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World Journal of Gastroenterology 2008年第34期14卷 5311-5315页

作者： Hisato Igarashi Tetsuhide Ito Ken Kawabe Terumasa Hisano Yoshiyuki arita Toyoma Kaku Ryoichi Takayanagi Department of medicine and Bioregulatory Science Graduate School of Medical ScienceKyushu University

AIm:To evaluate the chemoradiotherapy for locally advanced pancreatic cancer utilizing low dose gemcitabine as a radiation sensitizer administered twice weekly. mETHODS: We performed a retrospective analysis of chemoradiotherapy utilizing gemcitabine administered twice weekly at a dose of 40 mg/m2. After that, maintenance systemic chemotherapy with gemcitabine, at a dose of 1000 mg/m2, was administered weekly for 3 wk with 1-wk rest until disease progression or unacceptable toxicity developed. RESULTS: Eighteen patients with locally advanced unresectable pancreatic cancer were enrolled. Three of those patients could not continue with the therapy; one patient had interstitial pneumonia during radiation therapy and two other patients showed liver metastasis or peritoneal metastasis during an early stage of the therapy. The median survival was 15.0 mo and the overall 1-year survival rate was 60%, while the median progression-free survival was 8.0 mo. The subgroup which showed the reduction of tumor development, more than 50% showed a tendency for a better prognosis; however, other parameters including age, gender and performance status did not correlate with survival. The median survival of the groups that died of liver metastasis and peritoneal metastasis were 13.0 mo and 27.7 mo, ***: Chemoradiotherapy with low-dose gemcitabine administered twice weekly could be effective to patients with locally advanced pancreatic cancer; however, patients developing liver metastases had a worse prognosis. Another chemoradiotherapy strategy might be needed for those patients, such as administrating one or two cycles of chemotherapy initially, followed by chemoradiotherapy for the cases with no distant metastases.

关键词：胰腺癌化学疗法肿瘤标志物药物剂量管理