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Suppression of Vortex-Induced Vibration Caused by A Terebridae-Inspired Cylinder with Different Helical Angles

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China Ocean Engineering 2024年第5期38卷 739-754页

作者： yu qi-dong MAO Zhao-yong TIAN Wen-long WANG Wei Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina

Biomimetic design has recently received widespread *** by the Terebridae structure,this paper provides a structural form for suppressing vortex-induced vibration(VIV)*** different structural forms are shown,including the traditional smooth cylinder(P0),and the Terebridae-inspired cylinder with the helical angle of 30°(P_(30)),60°(P_(60)),and 90°(P_(90)).Computational fluid dynamics(CFD)method is adopted to solve the flow pass the Terebridae-inspired structures,and the vibration equation is solved using the Newmark-β*** results show that for P_(30),P_(60) and P_(90),the VIV responses are effectively suppressed in the lock-in region,and P_(60) showed the best VIV suppression *** transverse amplitude and the downstream amplitude can be reduced by 82.67%and 91.43%respectively for P_(60) compared with that for P0,and the peak of the mean-drag coefficient is suppressed by 53.33%.The Q-criterion vortices of P_(30),P_(60),and P_(90) are destroyed,with irregular vortices *** is also found that the boundary layer separation is located on the Terebridae-inspired *** twisted ribs cause the separation point to constantly change along the spanwise direction,resulting in the development of the boundary layer separation being completely *** strength of the wake flow is significantly weakened for the Terebridae-inspired cylinder.

关键词： vortex-induced vibration(VIV) Terebridae cylinder suppression helical angle

Integrated utilization of low-grade thermal energy in hot coal mine

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Journal of Coal Science & Engineering(China) 2013年第1期19卷 26-32页

作者： Wei-min CHENG yu-dong qi Yan-bin yu Gang PAN Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266590China Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Scienceand Technology Qingdao 266590 China

This paper explores the integrated utilization of low-grade thermal energy in hot coal mines, based on analysis of original heating, refrigerating, mine draining, bath draining and air exhaust systems, and in combination with the actual conditions of Tangkou Coal Mine in Shandong Province. It presents a set of comprehensive and integrated utilization schemes for the various different kinds of low quality heat energy. With heat pumps, the recycling of the low quality heat energy from the drainage, bathing water and the exhaust air can occur in winter, and in summer, there exists condensed heat of the refrigerating system. When in conjunction with solar collectors, the thermal utilization of solar power can be realized for the whole year. The system achieves mine drainage and bathing water purification and recycling, as well as purifying exhaust air by water spraying. It also satisfies the demands of a whole year＇s bathing heat for the coal mine, with refrigeration in summer, and heating for the ground house and shaft house in winter. It is able to integrate different kinds of low quality heat energy and low emission drainage and dust, and can replace the traditional boiler heating system. Finally, the system reduces conventional energy consumption and the amount of mine water drainage.

关键词： low-grade thermal energy high temperature mine integrated utilization energy conservation

Strength and fatigue properties of three-step sintered dense nanocrystal hydroxyapatite bioceramics

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Frontiers of Materials Science 2013年第2期7卷 190-195页

作者： Wen-Guang GUO Zhi-Ye qiU Han CUI Chang-Ming WANG Xiao-Jun ZHANG In-Seop LEE yu-qi dong Fu-Zhai CUI School of Materials Science and Engineering Tsinghua University Beijing 100084 China Beijing AIIgens Medical Science and Technology Co. Ltd. Beijing 100085 China Institute of Natural Science and Atomic-scale Surface Science Research Center Yonsei University Seoul 120-749 Korea Department of Orthopedics Renji Hospital Affiliated with Shanghai Jiao Tong University School of Medicine Shanghai 200127 China

Dense hydroxyapatite （HA） ceramic is a promising material for hard tissue repair due to its unique physical properties and biologic properties. However, the brittleness and low compressive strength of traditional HA ceramics limited their applications, because previous sintering methods produced HA ceramics with crystal sizes greater than nanometer range. In this study, nano-sized HA powder was employed to fabricate dense nanocrystal HA ceramic by high pressure molding, and followed by a three-step sintering process. The phase composition, microstructure, crystal dimension and crystal shape of the sintered ceramic were examined by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. Mechanical properties of the HA ceramic were tested, and cytocompatibility was evaluated. The phase of the sintered ceramic was pure HA, and the crystal size was about 200 nm. The compressive strength and elastic modulus of the HA ceramic were comparable to human cortical bone, especially the good fatigue strength overcame brittleness of traditional sintered HA ceramics. Cell attachment experiment also demonstrated that the ceramics had a good cytocompatibility.

关键词： nanocrystal hydroxyapatite ceramic three-step sintering mechanicalproperty fatigue strength cytocom patibility

新时代企业社会责任的创新与治理--专栏导语

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中山大学学报（社会科学版） 2023年第1期63卷 163-164页

作者：戚聿东北京师范大学经济与工商管理学院北京100875

党的二十大报告提出“高质量发展是全面建设社会主义现代化国家的首要任务”,《中华人民共和国国民经济和社会发展第十四个五年规划和2035年远景目标纲要》将“推动高质量发展为主题”,并作为我国“十四五”时期经济和社会发展的重要指... 详细信息

党的二十大报告提出“高质量发展是全面建设社会主义现代化国家的首要任务”,《中华人民共和国国民经济和社会发展第十四个五年规划和2035年远景目标纲要》将“推动高质量发展为主题”,并作为我国“十四五”时期经济和社会发展的重要指导思想和战略导向。企业是经济社会的微观主体与基本单元,企业的高质量发展是实现整体经济高质量发展的必然要求和内在体现。立足新发展阶段,更好履行社会责任,进而实现企业价值与社会价值的有机统一,业已成为现代企业的目标追求和战略行动。

关键词：企业社会责任新发展阶段经济和社会发展战略导向高质量发展履行社会责任五年规划微观主体

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中性Top介子与轻子味破坏衰变过程

高能物理与核物理 2005年第11期29卷 1027-1032页

作者：岳崇兴于东麒辽宁师范大学物理与电子技术学院大连116029

在顶色辅助的人工色(TC2)模型框架下,研究了中性top介子π_t^0对轻子味破坏(LFV)过程l_i→l_jγ,l_i→l_Jl_kl_l和t→cl_il_j的贡献。考虑到当前μ→eγ过程的实验上限对TC2模型中自由参数的一些限制,进一步计算了top介子对过程l_i→l_j... 详细信息

在顶色辅助的人工色(TC2)模型框架下,研究了中性top介子π_t^0对轻子味破坏(LFV)过程l_i→l_jγ,l_i→l_Jl_kl_l和t→cl_il_j的贡献。考虑到当前μ→eγ过程的实验上限对TC2模型中自由参数的一些限制,进一步计算了top介子对过程l_i→l_jl_kl_l和t→cl_il_j分支比的量子修正。数值结果表明,在大部分参数空间内分支比的值可提高几个量级。top介子对某些过程的修正效应也许可被将来的实验观测到。

关键词：中性top介子(πt^0) 轻子味破坏(LFV) 分支比中性Top介子衰变过程轻子中性top介子实验观测 TC2模型模型框架

中国垄断行业引入竞争机制的国际背景、进程和模式选择

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首都经济贸易大学学报 2009年第4期11卷 28-39页

作者：戚聿东首都经济贸易大学工商管理学院北京100070

深化垄断行业改革是现阶段国有企业改革的主要内容,引入竞争机制是垄断行业改革的前提和关键。本文介绍了发生于世界范围内的垄断行业改革的技术经济背景,阐述了国外在垄断行业引入竞争机制的五种模式和路径,在此基础上介绍中国主要垄... 详细信息

深化垄断行业改革是现阶段国有企业改革的主要内容,引入竞争机制是垄断行业改革的前提和关键。本文介绍了发生于世界范围内的垄断行业改革的技术经济背景,阐述了国外在垄断行业引入竞争机制的五种模式和路径,在此基础上介绍中国主要垄断行业改革的进程和竞争状况,最后指出了中国垄断行业的竞争模式选择。

关键词：垄断行业竞争机制模式

Multilevel analysis of the central-peripheral-target organ pathway:contributing to recovery after peripheral nerve injury

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Neural Regeneration Research 2025年第10期20卷 2807-2822页

作者： Xizi Song Ruixin Li Xiaolei Chu qi Li Ruihua Li qingwen Li Kai-yu Tong Xiaosong Gu dong Ming Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina Haihe Laboratory of Brain-Machine Interface and Human-Machine Fusion TianjinChina Department of Rehabilitation Tianjin University Tianjin HospitalTianjinChina Department of Hand Microsurgery Tianjin University Tianjin HospitalTianjinChina School of Exercise and Health Tianjin University of SportTianjinChina Department of Biomedical Engineering the Chinese University of Hong KongHong Kong Special Administrative RegionChina

Peripheral nerve injury is a common neurological condition that often leads to severe functional limitations and *** on the pathogenesis of peripheral nerve injury has focused on pathological changes at individual injury sites,neglecting multilevel pathological analysis of the overall nervous system and target *** has led to restrictions on current therapeutic *** this paper,we first summarize the potential mechanisms of peripheral nerve injury from a holistic perspective,covering the central nervous system,peripheral nervous system,and target *** peripheral nerve injury,the cortical plasticity of the brain is altered due to damage to and regeneration of peripheral nerves;changes such as neuronal apoptosis and axonal demyelination occur in the spinal *** nerve will undergo axonal regeneration,activation of Schwann cells,inflammatory response,and vascular system regeneration at the injury *** damage to target organs can occur,including skeletal muscle atrophy and sensory receptor *** then provide a brief review of the research advances in therapeutic approaches to peripheral nerve *** main current treatments are conducted passively and include physical factor rehabilitation,pharmacological treatments,cell-based therapies,and physical ***,most treatments only partially address the problem and cannot complete the systematic recovery of the entire central nervous system-peripheral nervous system-target organ ***,we should further explore multilevel treatment options that produce effective,long-lasting results,perhaps requiring a combination of passive(traditional)and active(novel)treatment methods to stimulate rehabilitation at the central-peripheral-target organ levels to achieve better functional recovery.

关键词： central nervous system central peripheral target organ multilevel pathological analysis nerve regeneration peripheral nerve injury peripheral nervous system target organs therapeutic approach

人工智能产业的包容审慎监管:理论内涵与实现路径

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兰州大学学报（社会科学版） 2024年第4期52卷 154-165页

作者：戚聿东刘健北京师范大学经济与工商管理学院北京100875 北京物资学院经济学院北京101149

人工智能产业是具有“新技术、新产品、新经济、新风险”等新特征的新兴产业,对人工智能产业监管模式与监管路径的研究是实现创新与风险相平衡的核心与关键。包容审慎监管是集包容创新与风险防范于一体的监管模式,具有有效市场与有为政... 详细信息

人工智能产业是具有“新技术、新产品、新经济、新风险”等新特征的新兴产业,对人工智能产业监管模式与监管路径的研究是实现创新与风险相平衡的核心与关键。包容审慎监管是集包容创新与风险防范于一体的监管模式,具有有效市场与有为政府相融合的理论内涵,是市场与政府关系理论在监管领域的实践表出。按照分层分类的研究思路与方法,人工智能产业基础层、技术层与应用层具有不同的技术、经济、风险特征,包容审慎监管契合人工智能产业跨领域、跨主体、跨行业的技术经济特征,能有效防范人工智能产业多层次、多元化、复合型的风险属性,是适合于人工智能产业等新经济的有效监管模式。应以底线思维和以人为本为监管原则,以监管沙盒为主要运行机制,以分级分类、全过程动态和多主体协同为主要手段,有效实施对人工智能产业的包容审慎监管。

关键词：人工智能产业包容审慎监管理论内涵适应性实现路径

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域观范式下中国数字经济发展战略与路径探索

北京社会科学 2023年第5期 95-105页

作者：戚聿东郝越北京师范大学经济与工商管理学院

数字经济作为一种新经济形态,使得现有经济理论体系“宏观—微观”范式的局限性突显。基于域观范式,可以从多维视角探究数字经济的发展特征,构建包含核心层、产业层、平台层、应用层和生态层五个层面的数字经济分析范式。以此为逻辑起点... 详细信息

数字经济作为一种新经济形态,使得现有经济理论体系“宏观—微观”范式的局限性突显。基于域观范式,可以从多维视角探究数字经济的发展特征,构建包含核心层、产业层、平台层、应用层和生态层五个层面的数字经济分析范式。以此为逻辑起点,梳理中国的制度形态优势和价值文化优势,重构中国数字经济发展的战略框架与实现路径,具体包括:加强核心数字技术攻关,推动数字经济标准化建设,加快数字基础设施建设,激发数据要素活力,推进产业数字化转型,加强数字领域国际合作。

关键词：数字经济域观范式技术-经济范式发展战略

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