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Static Stability Analysis of a Single Planar Object Grasped by *** Hand

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Journal of Mechanics Engineering and Automation 2012年第10期2卷 606-627页

作者： Takayoshi yamada Manabu yamada Hidehiko Yamamoto Department of Human and Information Systems Faculty of Engineering Gifu University Gifu 501-1193 Japan Department of Mechanical Engineering Faculty of Engineering Nagoya Institute of Technology Nagoya 466-8555 Japan

In this study, the static stability of the grasp of a single planar object is analyzed using the potential energy method. In previous papers, we considered cases in which individual fingers were replaced by a multidimensional translational spring model, in which each finger is constructed with prismatic joints. Human hands and the most developed mechanical hands are constructed with revolute joints. In this paper, the effects of fingertip rotation and a revolute joint spring model are investigated. A grasp stiffness matrix is analytically derived by considering not only frictional rolling contact but also frictionless sliding contact. The difl＇erence between the frictional stiffness matrix and the frictionless one is analytically obtained. The effect of local curvature at contact points is analytically derived. The grasp displacement directions affected by the change in curvature and the contact condition are also obtained. The derived stiffness matrix of the revolute joint model is compared with that of the prismatic joint model, and then the stiffness relation is clarified. The gravity effect of the object is also considered. The effectiveness of our method is demonstrated through numerical examples. The stability is evaluated by the eigenvalues of the grasp stiffness matrix, and the grasp displacement direction is obtained by the corresponding eigenvectors. The effect of joint angle is also discussed.

关键词： Grasping multifingered hands static grasp stability revolute joint stiffness model.

Is a nasogastric tube necessary after transumbilical laparoscopic-assisted appendectomy in children with perforated appendicitis?

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World Journal of Pediatrics 2019年第6期15卷 615-619页

作者： Akinori Sekioka Koji Fukumoto Toshiaki Takahashi Hiromu Miyake Kengo Nakaya Akiyoshi Nomura Yutaka yamada Naoto Urushihara Department of Pediatric Surgery Shizuoka Children's Hospital860 UrushiyamaAoi-kuShizuoka 420-8660Japan

Background This study assessed the necessity of postoperative nasogastric tube(NGT)use in acute pediatric cases of per-forated *** All cases of acute pediatric perforated appendicitis managed with transumbilical laparoscopic-assisted appendec-tomy at our hospital from 2011 to 2017 were retrospectively ***-two cases were selected and divided into two groups based on NGT *** There were no significant differences between the two groups in most parameters of patient demographics,or surgi-cal ***,the mean time to first oral intake and to regular diet was significantly shorter in no-NGT group(1 day vs 3 days,P<0.0001;and 4 days vs 7 days,P=0.003,respectively).Postoperative length of stay was significantly shorter in no-NGT group(7 days vs 9 days,P<0.0001).Conclusion Considering the results of our analysis,we believe that routine NGT placement is not always necessary in these situations.

关键词： Children Perforated appendicitis Postoperative care

Japanese Mythology From Ethnological Perspectives

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History Research 2013年第5期3卷 309-316页

作者： Hitoshi yamada Tohoku University Sendai Japan

Comparative studies of Japanese mythology have developed since the 1920s above all through eftbrts of Japanese ethnologists. They have paid attention to the possible ethno-cultural complexes that brought mythological motifs into the archipelago. In the present paper the theories set forth by Nobuhiro Matsumoto, Akihide Mishina, and Masao Oka are examined in terms of retrospect. The result shows that they shared the view that at least three different complexes, based in ancient Yamato, Izumo, and Kyushu respectively, contributed to the formation of Japanese mythology compiled in the 8th century CE （Common Era）. Their assumptions were synthesized by Taryo Obayashi in 1961, the hypothesis which has survived until today. In future we should cooperate with other disciplines and address the formation process of Japanese mythology.

关键词： Japanese mythology retrospect ethnology ethnogenesis diffusion

Some Comments on the Real Meaning of Schrodinger’s Equation Revealed by the Fact that Electron Is Always a Particle

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Journal of Quantum Information Science 2012年第4期2卷 112-118页

作者： Hironari yamada Faculty of Science and Engineering Ritsumeikan UniversityKusatsuJapan

We all physicist have long been believed that an elementary particle is a wave as well as a particle, but we discuss in this paper that an electron (probably all fermions) is always a particle. Author claim that quantum mechanics (QM) is not such mysterious as Bohr stated that the wave turn to the particle by observation. We can understand QM by natural human sense. The wave nature of electrons is only an appearance or a phenomena but not intrinsic or substantial. An electron is an individual body, which interferes with other individual electrons. Interference is the key word instead of the wave to understand the quantum mechanics. Interference produces the wave nature and the uncertainty. When we determine that an electron is nothing but a particle, we will see the true meaning of wave function and the Schr?dinger’s equation.

关键词： Quantum Mechanics Interference Uncertainty Principle Pauli Exclusive Principle Schrodinger’s Equation

Cases of pediatric intra-abdominal solid organ injury induced by blunt trauma experienced over a 15-year period at two centers in Japan

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World Journal of Pediatric Surgery 2023年第3期6卷 168-174页

作者： Mayu Matsui Koshiro Sugita Takafumi Kawano Nanako Nishida Ayaka Nagano Masakazu Murakami Keisuke Yano Toshio Harumatsu Shun Onishi Koji yamada Waka yamada Mitsuru Muto Tatsuru Kaji Satoshi Ieiri Department of Pediatric Surgery Kagoshima City HospitalKagoshimaJapan Department of Pediatric Surgery Research Field in Medical and Health SciencesMedical and Dental AreaResearch and Education AssemblyKagoshima UniversityKagoshimaJapan Department of Pediatric Surgery Kurume University School of MedicineKurumeJapan

Objective The present study attempts to clarify the clinical features of pediatric intra-abdominal solid organ injury at two *** The injured organ,patient age,sex,injury grade,imaging findings,intervention,length of hospital stay,and complications were retrospectively reviewed using medical records at two centers from 2007 to *** There were 25 cases of liver injury,9 of splenic injury,8 of pancreatic injury,and 5 of renal *** mean age of all patients was 8.6±3.8 years old,with no difference between organ injury *** intervention was performed in four cases of liver injury(16.0%)and one case of splenic injury(11.1%),and surgery was performed in two cases of liver injury(8.0%)and three cases of pancreatic injury(37.5%).All other cases were treated *** included adhesive ileus in one case of liver injury(4.0%),splenic atrophy in one case of splenic injury(11.1%),pseudocysts in three cases of pancreatic injury(37.5%),atrophy of the pancreatic parenchyma in one case of pancreatic injury(12.5%),and urinoma in one case of renal injury(20.0%).No mortalities were *** Pediatric patients with blunt trauma had favorable outcomes at two pediatric trauma centers covering a broad medical area,including remote islands.

关键词： pediatric trauma injury

Multiphase surfactant-assisted reaction-separation system in a microchannel reactor

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Frontiers of Chemical Science and Engineering 2009年第1期3卷 33-38页

作者： Saah ALJBOUR Tomohiko TAGAWA Mohammad MATOUQ Hiroshi yamada Department of Chemical Engineering Nagoya UniversityChikusaNagoya 464-8603Japan 2 Faculty of Engineering TechnologyAl-Balqa Applied UniversityAmman 11134Jordan

The Lewis acid-catalyzed addition of tri-methylsilyl cyanide to p-chlorobenzaldehyde in a micro-channel reactor was *** microchannel was integrated to promote both reaction and separation of the biphase ***3 and Cu(triﬂate)2 were used as water-stable Lewis acid *** dodecyl sulfate was incorporated in the organic-aqueous system to enhance the reactivity and to manipulate the multiphaseﬂow inside the *** was found that the dynamics and the kinetics of the multiphase reaction were affected by the new micellar *** multiphaseﬂow inside the microchannel was obtained,allowing for continuous and acceptable phase *** selectivity was achieved by operating at lower conversion values.

关键词： Lewis acid catalysis multiphase reactions process intensiﬁcation microchannel reactor green engi-neering

Buckling Load Evaluation Method for Single Layer Cylindrical Lattice Shells

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Journal of Civil Engineering and Architecture 2012年第3期6卷 268-279页

作者： Seishi yamada Department of Architecture and Civil Engineering Toyohashi University of Technology Toyohashi 441-8580 Japan

A rational design evaluation procedure is investigated for the elastic overall buckling load carrying capacity of single layer cylindrical lattice shell roof structures. The nature of the imperfection sensitivity of these structures is for the first time reviewed in this paper. This allows the development of the reduced stiffness buckling analytical concept for the lattice shells based upon the introduction of a simple lower bound estimation equation through the use of the so-called continuum shell analogy theory. The linear and nonlinear buckling loads found from conventional finite element analyses are compared with the present estimations. Finally, the elastic-plastic load carrying capacity estimation method through the use of the present elastic lower bound criteria is also proposed.

关键词： Metal lattice shell Buckling design formula cylindrical barrel vault roof structure.

Z-bpy,a New C2-Symmetric Bipyridine Ligand and Its Application in Enantioselective Copper(Ⅰ)-Catalyzed Cyclopropanation of Olefins

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Chinese Journal of Chemistry 2019年第8期37卷 807-810页

作者： Yizhao Ouyang Miao Zhan Jing Zhou Jiao Jiao Hao HU Yoichi M.A.yamada Pengfei Li Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'anShaanxi 710054China Department of Applied Chemistry School of ScienceXi'an Jiaotong UniversityXi'anShaanxi 710049China Xi'an Key Laboratory of Sustainable Energy Materials Chemistry Xi'an Jiaotong UniversityXi'anShaanxi 710049China RIKEN Center for Sustainable Resource Science WakoSaitama 3510198Japan

Summary of main observation and conclusion A rigid C2-symmetric chiral bipyridine ligand Z-bpy with a triptycene-like backbone was designed and synthesized from simple chemicals in a scalable *** this new ligand,copper(Ⅰ) catalyzed cyclopropanation of styrenes with commercial ethyl diazoacetate produced various corresponding cyclopropanes in high yields,diastereoselectivity and enantioselectivity up to 97% ee.

关键词： Its was

新型糖基聚合物的合成及其作为高效液相色谱手性固定相的应用(英文)

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色谱 2016年第1期34卷 4-9页

作者： Tomoyuki IKAI Takayuki yamada Graduate School of Natural Science and Technology Kanazawa University

Two novel polymers containing glucose units as the main-chain that only differ in terms of their regioregularity were synthesized to evaluate their chiral recognition abilities as chiral stationary phases(CSPs)for high performance liquid chromatography(HPLC).The regioregular polymer(poly-5)shows clear resolution ability for the racemate of cobalt(Ⅲ)acetylacetonate(Co(acac)3),whereas the corresponding regioirregular polymer(poly-3)does not show any chiral recognition for Co(acac)*** regioregular polymer main-chain seems to play an important role not only in providing an efficient interaction with the racemate but also in expressing the chiral recognition ability as a CSP for HPLC.

关键词：金属有机骨架化合物手性分离对映异构体选择性苇墩