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沙尘暴区域大坝

城市环境设计 2013年第12期 142-143页

作者： ken Sei fong Katia Sei fong 乌拉圭共和国大学建筑学院

沙尘暴,严重地影响着城市以及城市居民的生活。设计者以这个问题作为契机,发明了一种能够自我消融的建筑,它只存在于沙尘暴夹载的沙粒中,是一种短暂的建筑,甚至短暂到不存在的建筑。从城市角度出发,设计者寻求兴建一系列的"大坝"来浸润... 详细信息

沙尘暴,严重地影响着城市以及城市居民的生活。设计者以这个问题作为契机,发明了一种能够自我消融的建筑,它只存在于沙尘暴夹载的沙粒中,是一种短暂的建筑,甚至短暂到不存在的建筑。从城市角度出发,设计者寻求兴建一系列的"大坝"来浸润城市,具体位置根据主要沙漠风向来确定。以影响最严重的地区建立的一个标准为例,这种小规模干预能够确保通过与一系列"大坝"协调

关键词：大坝沙尘暴建筑学院

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新型低beta超导腔调谐算法分析与测试

原子核物理评论 2018年第3期35卷 294-301页

作者：马腾飞薛鹏 ken fong 王贤武黄贵荣高郑宫正朱正龙中国科学院近代物理研究所兰州730000 中国科学院大学北京100049 西北师范大学兰州730070 TRIUMF:Canada's Particle Accelerator Center Vancouver V6T2A3British ColumbiaCanada

为了使腔体在复杂电磁环境下处于谐振状态,保持超导腔加速电压的幅度相位稳定,研发了一种应用于自激锁相模式的腔体新型调谐算法。利用正交电压Q值控制调谐器调谐,从而消除了输入和输出间的相位误差,给出了理论推导过程与该算法的可靠... 详细信息

为了使腔体在复杂电磁环境下处于谐振状态,保持超导腔加速电压的幅度相位稳定,研发了一种应用于自激锁相模式的腔体新型调谐算法。利用正交电压Q值控制调谐器调谐,从而消除了输入和输出间的相位误差,给出了理论推导过程与该算法的可靠性分析。该算法已应用于中国科学院近代物理研究所ADS项目超导加速器中,简化了传统控制模式中的信号采样数量,提高了系统控制精度与抗干扰能力,使腔体克服了在调谐过程中由于功率上冲引起的氦压波动。保证了超导腔在工作状态下,频率稳定在162.5 MHz,频率误差小于17 Hz。

关键词：超导腔闭环自激最小正交分量调谐算法

New aspects of a small GTPase RAB35 in brain development and function

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Neural Regeneration Research 2025年第7期20卷 1971-1980页

作者： Ikuko Maejima ken Sato Laboratory of Molecular Traffic Institute for Molecular and Cellular RegulationGunma UniversityMaebashiJapan

In eukaryotic cells,organelles in the secretory,lysosomal,and endocytic pathways actively exchange biological materials with each other through intracellular membrane trafficking,which is the process of transporting the cargo of proteins,lipids,and other molecules to appropriate compartments via transport vesicles or *** processes are strictly regulated by various small GTPases such as the RAS-like in rat brain(RAB)protein family,which is the largest subfamily of the RAS *** of membrane trafficking affects tissue homeostasis and leads to a wide range of diseases,including neurological disorders and neurodegenerative ***,it is important to understand the physiological and pathological roles of RAB proteins in brain ***35,a member of the RAB family,is an evolutionarily conserved protein in metazoans.A wide range of studies using cultured mammalian cells and model organisms have revealed that RAB35 mediates various processes such as cytokinesis,endocytic recycling,actin bundling,and cell ***35 is also involved in neurite outgrowth and turnover of synaptic *** generated brain-specific Rab35 knockout mice to study the physiological roles of RAB35 in brain development and *** mice exhibited defects in anxiety-related behaviors and spatial ***,RAB35 is required for the precise positioning of pyramidal neurons during hippocampal development,and thereby for normal hippocampal *** contrast,layer formation in the cerebral cortex occurred superficially,even in the absence of RAB35,suggesting a predominant role for RAB35 in hippocampal development rather than in cerebral cortex *** studies have suggested an association between RAB35 and neurodegenerative diseases,including Parkinson's disease and Alzheimer's *** this review,we provide an overview of the current understanding of subcellular functions of *** also provide insights into the phys

关键词： endocytosis endosomes hippocampal development neurodegenerative diseases RAB35

Exploring the novel role of oligodendrocyte precursor cells in phagocytosis:beyond myelinogenesis

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Neural Regeneration Research 2025年第2期20卷 473-474页

作者： Gen Hamanaka ken Arai Neuroprotection Research Laboratories Departments of Radiology and NeurologyMassachusetts General Hospital and Harvard Medical SchoolCharlestownMAUSA

Roles of oligodendrocyte precursor cells in the central nervous system:Oligodendrocyte precursor cells(OPCs)have long been recognized for their critical role as precursors to oligodendrocytes,the primary myelin-producing *** precursors,OPCs mature and differentiate into oligodendrocytes,which contribute significantly to the formation of myelin sheaths around *** myelination,which is critical for the conduction of salutatory nerve impulses in the cerebral white matter,underscores the classical role of oligodendrocytes in central nervous system(CNS)***,because oligodendrocytes are differentiated cells that cannot proliferate.

关键词： critical system conduction

Local charge neutrality condition,Fermi level and majority carrier density of a semiconductor with multiple localized multi-level intrinsic/impurity defects

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Journal of Semiconductors 2011年第11期32卷 1-8页

作者： ken K.Chin Department of Physics and Apollo CdTe Solar Energy Research Center New Jersey Institute of Technology Department of Photonic and Information Engineering School of Electronic and Information EngineeringBeihang University

For semiconductors with localized intrinsic/impurity defects, intentionally doped or unintentionally incorporated, that have multiple transition energy levels among charge states, the general formulation of the local charge neutrality condition is given for the determination of the Fermi level and the majority carrier density. A graphical method is used to illustrate the solution of the problem. Relations among the transition energy levels of the multi-level defect are derived using the graphical method. Numerical examples are given for p-doping of the CdTe thin film used in solar panels and semi-insulating Si to illustrate the relevance and importance of the issues discussed in this work.

关键词： multi-level defects defect complex intrinsic impurity semiconductor Fermi level majority carrier density

Approximate graphical method of solving Fermi level and majority carrier density of semiconductors with multiple donors and multiple acceptors

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Journal of Semiconductors 2011年第6期32卷 1-6页

作者： ken K.Chin Department of Physics and Apollo CdTe Solar Energy Research Center New Jersey Institute of Technology

We present a generic approximate graphical method for determining the equilibrium Fermi level and majority carrier density of a semiconductor with multiple donors and multiple acceptors compensating each other. Simple and easy-to-follow procedures of the graphical method are *** graphically plotting two wrapping step functions facing each other,one for the positive hole-ionized donor and one for the negative electron-ionized acceptor,we have the crossing point that renders the Fermi level and majority carrier *** the graphical method,new equations are derived,such as the carrier compensation proportional to N;/N;,not the widely quoted N;-N;.Visual insight is offered to view not only the result of graphic determination of Fermi level and majority carrier density but also the dominant and critical pair of donors and acceptors in *** graphical method presented in this work will help to guide the design,adjustment,and improvement of the multiply doped *** of this approximate graphical method with previous work on compensation,and with some experimental results,is *** work in the field is proposed.

关键词： doping compensation Fermi level carrier density graphical method ionization

The Structure and Mechanical Properties of Cr4Mo4V Steel Treated by PIII Carbonitriding

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稀有金属材料与工程 2012年第S1期41卷 176-179页

作者： ken Yukimura Harbin Institute of Technology Harbin 150001China

The composition and structure of PIII(plasma immersion ion implantation)carbonitrided Cr4Mo4V steel were analyzed using X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),optical microscopy(OM)and *** results indicate that the nitride and carbide are dispersion phase precipitation and except formation of compound other implantation atoms dissolve into martensite *** total concentration of carbon and nitrogen is about 30 at%near the surface,and still keeps at about 20 at%even at the depth of 8μ*** effect of treatment temperature,implantation time and ratio of N2 to CH4 on the hardness and wear resistance of carbonitrided layer are *** is found that the hardness of Cr4Mo4V steel increases after *** highest hardness of samples is 22.3 GPa,which is about 1.8 times than initial *** dry-wear resistance of the samples is also improved after treatment,and the sample with higher hardness shows the better wear resistance.

关键词： Cr4Mo4V steel PBII carbonitriding hardness wear resistance

Analysis of the stress wave and rarefaction wave produced by hypervelocity impact of sphere onto thin plate

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Defence Technology（防务技术） 2020年第5期16卷 969-979页

作者： ken Wen Xiao-wei Chen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Institute of Systems Engineering China Academy of Engineering PhysicsMianyangSichuan621999China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing100081China

Shock wave is emitted into the plate and sphere when a sphere hypervelocity impacts onto a thin *** fragmentation and phase change of the material caused by the propagation and unloading of shock wave could result in the formation of debris cloud *** models are deduced based on one-dimensional shock wave theory and the geometry of sphere,which uses elliptic equations(corresponding to ellipsoid equations in physical space)to describe the propagation of shock wave and the rarefaction ***“Effective thickness”is defined as the critical plate thickness that ensures the rarefaction wave overtake the shock wave at the back of the ***“Effective thickness”is directly related to the form of the debris *** relation of the“Effective thickness”and the“Optimum thickness”is also *** impacts of Al spheres onto Al plates are simulated within SPH to verify the propagation models and associated *** results show that the wave fronts predicted by the propagation models are closer to the simulation result at higher impact *** curvatures of the wave fronts decrease with the increase of impact *** predicted“Effective thickness”is consistent with the simulation *** analysis about the shock wave propagation and unloading in this paper can provide a new sight and inspiration for the quantitative study of hypervelocity impact and space debris protection.

关键词： Hypervelocity impact Debris cloud Shock wave Rarefaction wave Effective thickness of plate

Emissivity of La_(1-x)Sr_xMnO_3/acrylic Resin Thermal Control Coating

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稀有金属材料与工程 2012年第S1期41卷 253-255页

作者： Yukimura ken Harbin Institute of Technology Harbin 150001China

Thermal control coatings were fabricated by mixing of La1-xSrxMnO3(LSMO)powder and acrylic resin and brushed on Al alloy *** powders of La0.7Sr0.3MnO3 and La0.8Sr0.2MnO3 were prepared using sol-gel *** results reveal the phase structure of LSMO powders are *** transition temperature from metal to insulator of La0.7Sr0.3MnO3 and La0.8Sr0.2MnO3 are 300 and 275 K,*** emissivity evolution with temperature of the coatings was *** La0.7Sr0.3MnO3/acrylic resin coating,the emissivity increases from 0.56 to 0.88,and for La0.7Sr0.3MnO3/acrylic resin coating from 0.50 to 0.90.

关键词： thermal control coatings LSMO emissivity