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创业导师对大学生创业能力影响的实证研究

创新与创业教育 2024年第1期15卷 56-64页

作者：汤海滨广州新华学院管理学院广东广州510520

创业导师参与创业项目和指导创业者这两种行为对于提升大学生的内在创业能力和获取外部资源的能力有重要影响。实证研究发现,创业导师参与创业项目对于提高大学生获取外部资源的能力具有显著相关性,但是对于提升大学生的内在创业能力没... 详细信息

创业导师参与创业项目和指导创业者这两种行为对于提升大学生的内在创业能力和获取外部资源的能力有重要影响。实证研究发现,创业导师参与创业项目对于提高大学生获取外部资源的能力具有显著相关性,但是对于提升大学生的内在创业能力没有显著性关系;创业导师指导创业者对提升创业者内在创业能力和获取外部资源的能力都具有显著相关性。在此基础上,从创业导师和创业者的角度分别提出对策建议,即创业导师需要谨慎参与创业项目,与大学生建立更多联接,帮助潜在创业者树立信心,而创业者首先需要提高自身内在创业能力。

关键词：创业导师大学生创业能力

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电推进粒子网格法模拟中计算加速方法的研究综述

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推进技术 2024年第8期45卷 1-25页

作者：汤海滨潘若剑毛仁凡崔云蔚任军学北京航空航天大学宇航学院北京102206 航天器设计优化与动态模拟技术教育部重点实验室北京102206 空间环境监测与信息处理工业和信息化部重点实验室北京102206 北京航空航天大学空间与环境学院北京102206

粒子网格法(PIC)模拟电推进装置等离子体时具有很强的第一性,但是模拟过程中计算负载很大,故PIC模拟的计算加速方法不可或缺。本文从电推进装置基本性质、低温等离子体物理特性和PIC算法特点作为切入点,明确了PIC方法在电推进装置模拟... 详细信息

粒子网格法(PIC)模拟电推进装置等离子体时具有很强的第一性,但是模拟过程中计算负载很大,故PIC模拟的计算加速方法不可或缺。本文从电推进装置基本性质、低温等离子体物理特性和PIC算法特点作为切入点,明确了PIC方法在电推进装置模拟过程中计算负载高的原因;结合国内外的研究现状,从建模、时空尺度、算法与并行三个层面介绍了对应计算加速方法的原理和效果;对各类计算加速方法进行了总结和展望。

关键词：电推进 PIC模拟计算加速方法并行计算综述

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在役高速公路大跨度斜拉桥荷载试验研究

四川建材 2024年第2期50卷 203-205页

作者：张扬徐冰雷张杰王敏汤海彬江苏宿淮盐高速公路管理有限公司江苏淮安223001 苏交科集团股份有限公司江苏南京210000 长大桥梁安全长寿与健康运维全国重点实验室江苏南京210000

淮安大桥为大跨度双索面斜拉桥,已服役18年,为掌握大桥当前结构状态和受力性能,对大桥进行荷载试验,针对主梁最大正负弯矩、主塔最大弯矩、主梁挠度、塔偏等设计加载工况。结果表明,淮安大桥测试截面的平均应变、挠度及塔顶偏位的校验... 详细信息

淮安大桥为大跨度双索面斜拉桥,已服役18年,为掌握大桥当前结构状态和受力性能,对大桥进行荷载试验,针对主梁最大正负弯矩、主塔最大弯矩、主梁挠度、塔偏等设计加载工况。结果表明,淮安大桥测试截面的平均应变、挠度及塔顶偏位的校验系数均处在合理范围内,相对残余均小于20%,大桥处于弹性工作阶段,受力性能良好,满足设计荷载的正常使用要求。

关键词：桥梁工程大跨度斜拉桥荷载试验承载能力评定

Selective laser melting of dense and crack-free AlCoCrFeNi_(2.1) eutectic high entropy alloy: Synergizing strength and ductility

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Journal of Materials Science & Technology 2022年第22期117卷 133-145页

作者： Lin He Shiwei Wu Anping Dong haibin tang Dafan Du Guoliang Zhu Baode Sun Wentao Yan Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering National University of Singapore117575Singapore School of Intelligent Manufacturing Nanjing University of Science and TechnologyNanjing 210094China

Additively manufactured high-entropy alloys generally suffer from low strength and/or poor *** this work,by leveraging the good castability of eutectic high entropy alloys and high cooling rate of selective laser melting(SLM),we report a nearly fully dense and crack-free as-SLM AlCoCrFeNi_(2.1) eutectic high entropy alloy with an exceptional strength-ductility synergy,showing an ultrahigh yield strength of 982.1±35.2 MPa and an ultimate tensile strength of 1322.8±54.9 MPa together with an elongation to fracture of 12.3±0.5%.Such strength-ductility enhancement is owing to the heterogeneous eutectic microstructure consisting of the columnar,equiaxed,and“L-shape”cells with much refined sizes down to *** morphology of cells in the transition zone is related to the misorientation between the growth direction of adjacent *** heterogeneous eutectic microstructure is the result of the graingrowth behavior dominated by the mechanisms of the epitaxial growth and growth of heterogeneous nuclei in *** current results provide a new methodology for the future design of ultrahigh-strength and ductile SLM-fabricated metallic materials including HEAs,and other printable alloys for various structural applications.

关键词： Additive manufacturing High entropy alloy Microstructure Mechanical properties Laser Crack-free

The azimuthal currents in the ion-driven magnetic nozzle

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Propulsion and Power Research 2022年第4期11卷 457-472页

作者： Zhiyuan Chen Yibai Wang haibin tang Junxue Ren Min Li Peng Wu Jinbin Cao School of Astronautics Beihang UniversityBeijing102206China Key Laboratory of Spacecraft Design Optimization and Dynamic Simulation Technologies Ministry of EducationBeijing102206China Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing102206China Innovation Academy of Microsatellites Chinese Academy of SciencesShanghai201203China School of Space and Environment Beihang UniversityBeijing102206China

Ion-driven magnetic nozzles(Ti>Te)are designed as intrinsic parts of cutting-edge propulsive technologies such as variable specific impulse magnetoplasma rockets(VASIMRs)and applied-field magnetoplasmadynamic *** a two-dimensional axisymmetric particle-in-cell(PIC)code,in the ion-driven magnetic nozzle,the compositions and distributions of azimuthal currents in different axial regions are investigated under various inlet ion temperatures Ti0 and found to differ dramatically from that in the electron-driven magnetic *** reported to be all paramagnetic and vanishing under a high magnetic field,the azimuthal currents resulting from the E 3 B drift are shown to turn diamagnetic and sustain a considerable magnitude when Ti0 is *** previously reported profile of diamagnetic drift current is altered by the introduction of inlet ion temperature,and the paramagnetic part is significantly ***,a wide range of paramagnetic currents appear downstream due to the inward detachment of ions,which can also be reduced by increasing inlet ion *** considered in this paper,the azimuthal currents resulting from grad-B and curvature drift are still negligible in all cases of *** magnitude of diamagnetic azimuthal currents increases with amplifying Ti0,indicating a clear physical image of energy transformation from ion thermal energy to the directed kinetic energy through electromagnetic processes in the magnetic ***,the magnetic inductive strength also has noticeable impacts on the azimuthal currents,the current magnitude tends to decrease as the magnetic field increases,and over-increment of it may result in larger divergence angles and lower nozzle efficiency.

关键词： Magnetic nozzle Azimuthal current Ion temperature Electric propulsion

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离子液体电喷推力器工作机理研究进展

上海航天（中英文） 2024年第3期41卷 130-142,149页

作者：陈宇翔程玉峰张金瑞张广川汤海滨王伟宗北京航空航天大学宇航学院北京102206

离子液体电喷推力器易于小型化,具有比冲高、推力精度高的特点,适用于微小卫星、太空引力波探测等领域,具有较大发展潜力。对电喷工作机理的认识与研究,不仅能够促进离子液体电喷推力器在工程中的应用,同时也为未来的进一步发展奠定基... 详细信息

离子液体电喷推力器易于小型化,具有比冲高、推力精度高的特点,适用于微小卫星、太空引力波探测等领域,具有较大发展潜力。对电喷工作机理的认识与研究,不仅能够促进离子液体电喷推力器在工程中的应用,同时也为未来的进一步发展奠定基础。基于此,本文首先回顾了电喷推力器的发展历程及现状;其次以离子液体电喷推力器3个基础工作过程为出发点,对其锥射流形成及发射机理、束流模式及引出特性、羽流自中和机制进行了基础理论介绍与研究现状的总结;最后对离子液体电喷推力器未来的工作机理研究方向和工程应用发展方向提出展望。

关键词：电推进电喷推力器离子液体工作机理锥射流

Coupling plasma plume of a low-power magnetically shielded Hall thruster with a hollow cathode

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Chinese Journal of Aeronautics 2020年第12期33卷 3018-3026页

作者： Guangchuan ZHANG Junxue REN Wei LIANG Ning OUYANG Chao LU haibin tang School of Space and Environment Beihang UniversityBeijing 100083China School of Astronautics Beihang UniversityBeijing 100083China Shanghai Institute of Space Propulsion Shanghai 201112China Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies Ministry of EducationBeijing 100083China Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100083China

The coupling region of a Hall thruster with a hollow cathode is the region between the cathode and the thruster *** characteristics of plasma in that region are complicated and strongly associated with the thruster working conditions and the cathode *** this paper,a laboratory 100 W class magnetically shielded Hall thruster was coupled with a hollow *** imaging and electrostatic probe were employed to monitor and scan the plasma *** characteristics in the coupling region in non-self-sustained mode and self-sustained mode were *** of the coupling plume with the cathode position was *** show that,when turning the thruster into self-sustained mode or moving the cathode further away axially,the discharge current can be reduced by 6.4–10.6%restraining the electron current and improving *** particular,when the cathode is moved further,the electron conduction near the channel walls is *** electron current is reduced by 27.4%and the ion beam current is increased by 7%.Overall,this work shows that the working mode of the thruster and the position of the cathode greatly affect the coupling plasma *** play an important role in improving the utilizations of propellant and current.

关键词： Coupling region Electron conduction Hall thruster Hollow cathode Utilizations of propellant and current

CRISPR/Cas9 system and its applications in nervous system diseases

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Genes & Diseases 2024年第2期11卷 675-686页

作者： haibin Jiang Mengyan tang Zidi Xu Yanan Wang Mopu Li Shuyin Zheng Jianghu Zhu Zhenlang Lin Min Zhang The Second School of Medicine Wenzhou Medical UniversityWenzhouZhejiang 325035China The First School of Medicine Wenzhou Medical UniversityWenzhouZhejiang 325035China Department of Pediatrics The Second School of MedicineThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouZhejiang 325027China Key Laboratory of Perinatal Medicine of Wenzhou WenzhouZhejiang 325027China Key Laboratory of Structural Malformations in Children of Zhejiang Province WenzhouZhejiang 325000China Zhejiang Provincial Clinical Research Center for Pediatric Disease WenzhouZhejiang 325027China

The clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein 9(Cas9)system is an acquired immune system of many bacteria and archaea,comprising CRISPR loci,Cas genes,and its associated *** system can recognize exogenous DNA and utilize the Cas9 protein's nuclease activity to break DNA double-strand and to achieve base insertion or deletion by subsequent DNA *** recent years,multiple laboratory and clinical studies have revealed the therapeutic role of the CRISPR/Cas9 system in neurological *** article reviews the CRISPR/Cas9-mediated gene editing technology and its potential for clinical application against neurological diseases.

关键词： CRISPR/Cas9 Gene editing Mutation Neurological diseases Therapeutics

Origin of strong and narrow localized surface plasmon resonance of copper nanocubes

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Nano Research 2019年第1期12卷 63-68页

作者： Peng Zheng haibin tang Botong Liu Sujan Kasani Ling Huang Nianqiang Wu Departm ent of Mechanical and Aerospace Engineering West Virginia UniversityMorgantownWest Virginia 26506-6106USA Institute of Advanced Materials Nanjing Tech UniversityNanjing 211816China Lane Department of Computer Science and Electrical Engineering West Virginia UniversityMorgantownWest Virginia 26506USA

Inexpe nsive copper nano particles are generally thought to possess weak and broad localized surface plasm on resonance(LSPR).The,present experimental and theoretical studies show that tailoring the Cu nanoparticle to a cubic shape results in a single intense,narrow,and asymmetric LSPR line shape,which is even superior to round-shaped gold *** this study,the dielectric function of copper is decomposed into an interband transition component and a free-electron *** allows interband transition-induced plasmon damping to be visualized both spectrally and by surface polarization *** results reveal that the LSPR of Cu nanocubes originates from the comer mode as it is spectrally separated from the interb and *** additi on,the interband tran sitions lead to severe damping of the local electromagnetic field but the cubic corner LSPR mode *** nanocubes display an extinction coefficient comparable to the dipole mode of a gold nanosphere with the same volume and show a larger local electromagnetic field enhancement These results will guider-development of in expensive plasmonic copper-based nano materials.

关键词： copper nanocube localized surface plasmon resonance discrete dipole approximation interband transition