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Flow Through Aerodynamic Torque Converter Installed in New Type Turbofan Engine

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Journal of Thermal Science 2007年第1期16卷 14-18页

作者： Toshiaki Kanemoto Dai Sakihama seita seki Ahmed Mohamed Galai FengQin Hant YeXiang Xiao Kyushu Institute of Technology： Sensui 1-1 Tobata Kitakyushu 804-8550 Japan South China University of Technology 381 WuShan Road Guangzhou China

It is desired to increase the core engine speed of the turbofan, to get the best efficiency for the next leap of the engine technology. The conventional mechanism in which the front fan is directly connected to the output shaft of the core engine has a limit of increasing the spool speed because the fan diameter is very large. The authors have proposed a new driving system in which the front fan is driven through the aerodynamic torque converter. The front fan can work at the conventional speed while the core engine runs more efficiently at higher speed. Continuously, in this paper, the flow through the converter is simulated numerically by CFX-5 with the k-εturbulence model of the commercial CFD code. The secondary flow occurred on the hub wall affects markedly the flow condition on the blade surfaces, and the flow along the suction surface of the driver blade separates near the trailing edge, which is deviated to the blade tip by the centrifugal force due to the wheel rotation.

关键词： turbofan engine torque converter front fan numerical simulation secondary flow separation

A machine learning approach to map crystal orientation by optical microscopy

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npj Computational Materials 2022年第1期8卷 70-78页

作者： Mallory Wittwer Matteo seita School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingaporeSingapore School of Materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore

Mapping grain orientation in crystalline solids is essential to investigate the relationships between local microstructure and crystallography and interpret materials *** of the main techniques used to perform these studies is electron backscatter diffraction(EBSD).Due to the limited measurement throughput,however,EBSD is not suitable for characterizing samples with long-range microstructure heterogeneity,nor for building large material libraries that include numerous *** present a machine learning approach for high-throughput crystal orientation mapping,which relies on the optical technique called directional reflectance *** successfully apply our method on Inconel 718 specimens produced by additive manufacturing,which exhibit complex,spatially-varying *** results demonstrate that optical orientation mapping on a metal alloy is *** our method is data-driven,it can be easily extended to different alloy systems produced using different manufacturing processes.

关键词： alloy microstructure crystal

Topology optimization of supporting structure for seismic response reduction of an arch

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Science China(Technological Sciences) 2016年第6期59卷 852-861页

作者： MIYAZU Yuji OHSAKI Makoto TSUDA seita Department of Architecture Hiroshima University Department of Architecture and Architectural Engineering Kyoto University Department of Design and Technology Okayama Prefectural University

A flexible supporting structure that reduces seismic response of an arch is proposed. Topology and cross-sectional areas of the supporting structure modeled as a truss structure are optimized through two steps of static and dynamic optimization problems. In the first step, a flexible supporting structure that has diagonal displacement at the top under horizontal load is obtained by solving static optimization problems. Then, in the second step, the cross-sectional area of the flexible member is optimized to minimize the seismic response acceleration of the arch evaluated by the complete quadratic combination(CQC) method. Time-history seismic response analysis is carried out to show that the response in the normal direction of the roof successfully decreases due to flexibility of the supporting structure; in addition, installing passive energy dissipation devices into the flexible supporting structure is very effective in reducing the tangential response of the arch.

关键词： topology optimization arch supporting structure truss nonlinear programming problem CQC method

Impacts of Global Warming on Hydrological Cycles in the Asian Monsoon Region

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Advances in Atmospheric Sciences 2008年第6期25卷 960-973页

作者： Koji DAIRAKU seita EMORI Toru NOZAWA Storm Flood and Landslide Research Department National Research Institute for Earth Science and Disaster Prevention Climate Risk Assessment Research Section Center for Global Environmental Research National Institute for Environmental Studies Atmospheric Physics Section Atmospheric Environment Division National Institute for Environmental Studies

The hydrologic changes and the impact of these changes constitute a fundamental global-warmingrelated concern. Faced with threats to human life and natural ecosystems, such as droughts, floods, and soil erosion, water resource planners must increasingly make future risk assessments. Though hydrological predictions associated with the global climate change are already being performed, mainly through the use of GCMs, coarse spatial resolutions and uncertain physical processes limit the representation of terrestrial water/energy interactions and the variability in such systems as the Asian monsoon. Despite numerous studies, the regional responses of hydrologic changes resulting from climate change remains inconclusive. In this paper, an attempt at dynamical downsealing of future hydrologic projection under global climate change in Asia is addressed. The authors conducted present and future Asian regional climate simulations which were nested in the results of Atmospheric General Circulation Model （AGCM） experiments. The regional climate model could capture the general simulated features of the AGCM. Also, some regional phenomena such as orographic precipitation, which did not appear in the outcome of the AGCM simulation, were successfully produced. Under global warming, the increase of water vapor associated with the warmed air temperature was projected. It was projected to bring more abundant water vapor to the southern portions of India and the Bay of Bengal, and to enhance precipitation especially over the mountainous regions, the western part of India and the southern edge of the Tibetan Plateau. As a result of the changes in the synoptic flow patterns and precipitation under global warming, the increases of annual mean precipitation and surface runoff were projected in many regions of Asia. However, both the positive and negative changes of seasonal surface runoff were projected in some regions which will increase the flood risk and cause a mismatch between water

关键词： hydrologic change dynamical downscaling regional climate model Asian monsoon region

Effects of metronomic sounds on a self-paced tapping task in budgerigars and humans

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Current Zoology 2019年第1期65卷 121-128页

作者： Yoshimasa seki Kenta Tomyta Department of Psychology Aichi University Machihatacho Toyohashi Aichi Japan

The origin of rhythmic synchronization or entrainment to a musical beat in animals has been widely discussed. Parrots are suitable animals to exami ne the relati on ship betwee n the capability of vocal learning and spontaneous rhythmic synchronization. In this study, budgerigars Melopsittacus undulatus learned to tap (peck) 2 keys alternately at a self-paced rate. Then, the metronomic sounds were played in the background during test sessions while the birds were performing the key pecking task, although they were not required to synchronize tap timing with the metronome. We found modest but significant effects of the metronome rhythms on the tap timing in some subjects. We also tested humans Homo sapiens using almost the same method. In contrast to the birds, a number of huma n subjects synchr on ized tap timing to the on set of the metronome without verbal or documented instructions. However, we failed to find an effect of the metronome on self-paced tap timing in some human subjects, although they were capable of rhythmic synchronization. This is the first report describing the effects of metronomic sounds on self-paced tapping in nonhuman vocal learners. This study introduces a new method that can be used in future research comparing birds that differ in vocal learning capacities, social structure, age, sex, hormonal status, and so on as part of exami nations of the evolutionary foun dati ons of beat processing.

关键词： opera nt con ditioning parrots rhythm synchronization vocal learning

WWW Business Applications Based on the Cellular Model

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Journal of Computer Science & Technology 2008年第2期23卷 176-187页

作者： Toshio Kodama Tosivasu L.Kunii Yoichi seki Venture Business Department Maeda Corporation2-10-26 FujimiChiyoda-kuTokyo 102-0071Japan Morpho Inc.The University of TokyoEntrepreneur Plaza 5F 7-3-1 HongoBunkyo-ku Tokyo 113-0033Japan Software Consultant 3-8-2 SakaemachiHino CityTokyo 191-0001Japan

A cellular model based on the Incrementally Modular Abstraction Hierarchy （IMAH） is a novel model that can represent the architecture of and changes in cyberworlds, preserving invariants from a general level to a specific one. We have developed a data processing system called the Cellular Data System （CDS）. In the development of business applications, you can prevent combinatorial explosion in the process of business design and testing by using CDS. In this paper, we have first designed and implemented wide-use algebra on the presentation level. Next, we have developed and verified the effectiveness of two general business applications using CDS： 1） a customer information management system, and 2） an estimate system.

关键词： cyberworlds incrementally modular abstraction hierarchy formula expression topological space adjunction space cellular space presentation level

Reachability of Patterned Conditional Pushdown Systems

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Journal of Computer Science & Technology 2020年第6期35卷 1295-1311页

作者： Xin Li Patrick Gardy Yu-Xin Deng Hiroyuki seki Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062China Graduate School of Informatics Nagoya UniversityNagoya 464-8601Japan

Conditional pushdown systems (CPDSs) extend pushdown systems by associating each transition rule with a regular language over the stack alphabet. The goal is to model program verification problems that need to examine the run-time call stack of programs. Examples include security property checking of programs with stack inspection, compatibility checking of HTML5 parser specifications, etc. Esparza et al. proved that the reachability problem of CPDSs is EXPTIME-complete, which prevents the existence of an algorithm tractable for all instances in general. Driven by the practical applications of CPDSs, we study the reachability of patterned CPDS (pCPDS) that is a practically important subclass of CPDS, in which each transition rule carries a regular expression obeying certain patterns. First, we present new satura-tion algorithms for solving state and configuration reachability of pCPDSs. The algorithms exhibit the exponential-time complexity in the size of atomic patterns in the worst case. Next, we show that the reachability of pCPDSs carrying sim-ple patterns is solvable in fixed-parameter polynomial time and space. This answers the question on whether there exist tractable reachability analysis algorithms of CPDSs tailored for those practical instances that admit efficient solutions such as stack inspection without exception handling. We have evaluated the proposed approach, and our experiments show that the pattern-driven algorithm steadily scales on pCPDSs with simple patterns.

关键词： conditional pushdown system pattern reachability saturation algorithm

Molecular mechanism of noradrenaline during the stress-induced major depressive disorder

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Neural Regeneration Research 2018年第7期13卷 1159-1169页

作者： Kenjiro seki Satomi Yoshida Manoj Kumar Jaiswal Department of Pharmacology School of Pharmaceutical ScienceOhu University Department of Psychiatry Icahn School of Medicine at Mount Sinai

Chronic stress-induced depression is a common hallmark of many psychiatric disorders with high morbidity ***-induced dysregulation of noradrenergic system has been implicated in the pathogenesis of *** of monoamine in the brain has been believed to be the main causative factor behind pathophysiology of major depressive disorder（MDD） and several antidepressants functions by increasing the monoamine level at the synapses in the ***,it is undetermined whether the noradrenergic receptor stimulation is critical for the therapeutic effect of *** to noradrenergic receptor stimulation,it has been suggested that the desensitization of β-adrenoceptor is involved in the therapeutic effect of *** addition,enhanced noradrenaline（NA） release is central response to stress and thought to be a risk factor for the development of ***,fast acting antidepressant suppresses the hyperactivation of noradrenergic neurons in locus coeruleus（LC）.However,it is unclear how they alter the firing activity of LC *** inconsistent reports about antidepressant effect of NA-reuptake inhibitors（NRIs） and enhanced release of NA as a stress response complicate our understanding about the pathophysiology of *** this review,we will discuss the role of NA in pathophysiology of stress and the mechanism of therapeutic effect of NA in *** will also discuss the possible contributions of each subtype of noradrenergic receptors on LC neurons,hypothalamic-pituitary-adrenal axis（HPA-axis） and brain derived neurotrophic factor-induced hippocampal neurogenesis during stress and therapeutic effect of NRIs in MDD.

关键词： major depression stress noradrenaline noradrenaline-reuptake inhibitors serotonin receptors hypothalamic-pituitary-adrenal axis locus coeruleus selective serotonin reuptake inhibitors serotonin noradrenaline-reuptake inhibitors

Methods of induced pluripotent stem cells for clinical application

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World Journal of Stem Cells 2015年第1期7卷 116-125页

作者： Tomohisa seki Keiichi Fukuda Department of Cardiology Keio University School of Medicine Tokyo 160-8582 Japan Department of Emergency and Critical Care Medicine Keio University School of Medicine Tokyo 160-8582 Japan

Reprograming somatic cells using exogenetic gene expression represents a groundbreaking step in regenerative medicine. Induced pluripotent stem cells(i PSCs) are expected to yield novel therapies with the potential to solve many issues involving incurable diseases. In particular, applying i PSCs clinically holds the promise of addressing the problems of immune rejection and ethics that have hampered the clinical applications of embryonic stem cells. However, as i PSC research has progressed, new problems have emerged that need to be solved before the routine clinical application of i PSCs can become established. In this review, we discuss the current technologies and future problems of human i PSC generation methods for clinical use.

关键词： Induced pluripotent stem cells Cell reprogramming