检索结果-南通市图书馆

Effect of Stress-Dependent Thermal Conductivity on Thermo-Mechanical Coupling Behavior in GaN-Based Nanofilm Under Pulse Heat Source

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2021年第1期34卷 27-39页

作者： Qicong Li Xiaoya Tang linli zhu Haihui Ruan Department of Engineering Mechanics and Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceZhejiang UniversityHangzhou310027China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

The thermal properties of a nanostructured semiconductor are affected by multi-physical fields,such as stress and electromagnetic fields,causing changes in temperature and strain distributions.In this work,the influence of stress-dependent thermal conductivity on the heat transfer behavior of a GaN-based nanofilm is investigated.The finite element method is adopted to simulate the temperature distribution in a prestressed nanofilm under heat pulses.Numerical results demonstrate the effect of stress field on the thermal conductivity of GaN-based nanofilm,namely,the prestress and the thermal stress lead to a change in the heat transfer behavior in the nanofilm.Under the same heat source,the peak temperature of the film with stress-dependent thermal conductivity is significantly lower than that of the film with a constant thermal conductivity and the maximum temperature difference can reach 8.2 K.These results could be useful for designing GaN-based semiconductor devices with higher reliability under multi-physical fields.

关键词： Multi-physical effect Stress-dependent thermal conductivity Prestress fields Heat transfer behavior GaN-based nanofilm Finite element method

Micromechanical simulation on strength and ductility of two kinds of Al-based nanostructural materials

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2017年第4期30卷 404-415页

作者： Xu He linli zhu Jinling Liu Linan An State Key Laboratory of Traction Power Southwest Jiaotong University Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong University Department of Engineering Mechanics and Key laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Department of Materials Science and Engineering and Advanced Materials Processing and Analysis Center University of Central Florida

The nanostructured Al-based composites possess the combination of high yield strength and good ductility. In this paper, a micromechanical model is presented to simulate the mechanical response of bimodal nanostructured A1 and the particle-reinforced aluminum matrix composite （PAMC）. The constitutive relations for different phases are addressed in the model, as well as the contribution of microcracks. Numerical results show that the model can successfully describe the enhanced strength and ductility of the bimodal nanostructured AI, and the predictions of the PAMC are in good agreement with the experimental data. It is worth noting that the strength and ductility are sensitive to the volume fraction of constituents and the distribution of rnicrocracks in both bimodal nanostructured A1 and PAMG. Therefore, the present theoretical results can be used to optimize the microstructure for improving the mechanical properties of nanostructured Al-based composites.

关键词： Nanocomposite Mechanism Microcrack Strength Ductility

Achieving high strength and high ductility in nanostructured metals: Experiment and modelling

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2012年第2期2卷 1-9页

作者： linli zhu Aiying Chen Jian LU Institute of Applied Mechanics School of Aeronautics and AstronauticsZhejiang University310007HangzhouZhejiang ProvinceChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina School of Material Science and Engineering Shanghai Institute of Technology201400ShanghaiChina Department of Mechanical and Biomedical Engineering City University of Hong KongKowloonHong KongChina

Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, Chinagrains to a^1-martensite nanograins with bimodal grain size distribution for lower strain rates to nanotwins in the ultrafine/coarse grained austenite phase for higher strain rates. Meanwhile, we will further address the mechanism-based plastic models to describe the yield strength, strain hardening and ductility in nanostructured metals with bimodal grain size distribution and nanotwinned polycrystalline metals. The proposed theoretical models can comprehensively describe the plastic deformation in these two kinds of nanostructured metals and excellent agreement is achieved between the numerical and experimental results. These models can be utilized to optimize the strength and ductility in nanostructured metals by controlling the size and distribution of nanostructures.

关键词： nanostructured metal bimodal grain size distribution nanotwinned metal yield strength,ductility strain hardening

On the role of piezoelectricity in phonon properties and thermal conductivity of GaN nanofilms

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2016年第6期6卷 277-281页

作者： linli zhu Haonan Luo Department of Engineering Mechanics and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University

The effect of piezoelectricity on phonon properties and thermal conductivity of gallium nitride （GaN） nanofilms is theoretically investigated. The elasticity model is utilized to derive the phonon properties in spatially confined GaN nanofilms. The piezoelectric constitutive relation in GaN nanofilms is taken into account in calculating the phonon dispersion relation. The modified phonon group velocity and phonon density of state as well as the phonon thermal conductivity are also obtained due to the contribution of piezoelectricity. Theoretical results show that the piezoelectricity in GaN nanofilms can change significantly the phonon properties such as the phonon group velocity and density of states, resulting in the variation of the phonon thermal conductivity of GaN nanofilms remarkably. Moreover, the piezoelectricity of GaN can modify the dependence of thermal conductivity on the geometrical size and temperature. These results can be useful in modeling the thermal performance in the active region of GaN-based electronic devices.

关键词： GaN nanofilm Phonon properties Elastic model Piezoelectricity Phonon thermal conductivity

国际研发伙伴地理特征与创新成功和创新失败——“多多益善”还是“舍近求远”?

在线全文

学校读者我要写书评

暂无评论

科技管理研究 2024年第5期44卷 72-81页

作者：李凡杨林丽朱缤绮北京第二外国语学院商学院北京100024

基于2015—2021年161家中国高技术产业企业的观测数据,以地理特征为核心,科学度量研发伙伴的地理邻近性和地理多样性,运用双变量Probit模型检验和比较不同情境下研发伙伴选择对创新成功和创新失败的影响,拓展经济地理学和知识基础观理... 详细信息

基于2015—2021年161家中国高技术产业企业的观测数据,以地理特征为核心,科学度量研发伙伴的地理邻近性和地理多样性,运用双变量Probit模型检验和比较不同情境下研发伙伴选择对创新成功和创新失败的影响,拓展经济地理学和知识基础观理论在国际研发伙伴选择中的应用。结果表明:(1)研发伙伴地理邻近性和多样性均会对创新成功和创新失败产生正向影响;(2)地理邻近性较高的研发伙伴对创新成功的促进作用更强,地理邻近性较低的研发伙伴对创新失败的促进作用更强;(3)地理多样性较低的研发伙伴对创新成功的促进作用更强,地理多样性较高的研发伙伴对创新成功和创新失败均有显著正向影响,但影响差异不明显。

关键词：研发伙伴地理邻近性地理多样性创新成功创新失败

在线全文

学校读者我要写书评

暂无评论

人乳头瘤病毒疫苗的研究现状与展望

中国肿瘤 2024年第2期33卷 153-160页

作者：卢林丽方佳琦阴建党乐朱兰中国医学科学院北京协和医学院群医学及公共卫生学院北京100730 国家癌症中心/国家肿瘤临床医学研究中心/中国医学科学院北京协和医学院肿瘤医院北京100021 国家妇产疾病临床医学研究中心中国医学科学院北京协和医学院北京协和医院北京100730

宫颈癌严重危害女性生命健康,近年来针对宫颈癌的一系列预防手段不断被探索开发,其中,疫苗是消除宫颈癌的有效手段。预防性人乳头瘤病毒(human papillomavirus,HPV)疫苗可从根本上阻断HPV的传播,是消除宫颈癌的第一道防线,目前多个疫苗... 详细信息

宫颈癌严重危害女性生命健康,近年来针对宫颈癌的一系列预防手段不断被探索开发,其中,疫苗是消除宫颈癌的有效手段。预防性人乳头瘤病毒(human papillomavirus,HPV)疫苗可从根本上阻断HPV的传播,是消除宫颈癌的第一道防线,目前多个疫苗已上市并被广泛应用。针对逆转HPV持续感染和宫颈病变的治疗性HPV疫苗的研发及验证研究正在陆续开展。疫苗对于宫颈癌的防治至关重要,全文综述HPV疫苗的研究进展。

关键词：人乳头瘤病毒宫颈癌预防性疫苗治疗性疫苗

Ternary ZnO/Co_(3)O_(4)/NiO inherited layered core-shell structure from a double template for high performanced supercapacitor

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2021年第4期7卷 708-720页

作者： linli zhu Chen Hao Saisai Zhou Xiaohong Wang Tiantian Zhou Yaning Guo School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiangJiangsu212013China

Relying on seed method,a double template ZIF-8@ZIF-67 with a layered core-shell structure was made,which is used as a sacrificial template in the next steps.After going through loading process with solvent thermal method and calcination process,ZIF-8@ZIF-67 was etched and calcined into ternary ZnO/Co_(3)O_(4)/NiO successfully.Besides,benefiting from right amount of the addition of inorganic salts,the optimized ZnO/Co_(3)O_(4)/NiO-2(ZCN-2)shows the outstanding performance in its morphologic structure and electrochemical performance.In the case of a current density of 1 Ag^(-1),the high specific capacitance of 1119.11 Cg^(-1) can be calculated in ZCN-2.In addition,at 10 Ag^(-1),the capacitance value can maintain 93.75%after experiencing 5000 cycles of charging and discharging.The maximum energy density of the assembled ZCN-2//activated carbon(AC)asymmetric supercapacitor can reach 95.82 Wh kg^(-1),which is really outstanding in the present research achievements.After experiencing charge-discharge cycles with the number of 10,000 times in the case of a current density of 10 Ag^(-1),the cycling stability of this supercapacitor can reach 94.53%of the initial value.And after a charge,the device connected by two supercapacitors can make a light emitting diode(LED)shine up to 30 min successfully.

关键词： Seed method ZIF-8@ZIF-67 Multi-metal oxide Stability Supercapacitor

高质量发展目标下湖南省物流枢纽城市综合评价

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

对外经贸 2024年第3期 43-47页

作者：陶林利朱佩芬湘南学院经济与管理学院湖南郴州423000

我国经济已由高速增长阶段转向高质量发展阶段,在相关政策的推动下,物流业的高质量发展成为湖南省促进经济发展、提升全要素生产率的重要举措。通过分析高质量发展目标下湖南省物流枢纽城市的现实基础与存在的问题,运用面板熵权法对湖... 详细信息

我国经济已由高速增长阶段转向高质量发展阶段,在相关政策的推动下,物流业的高质量发展成为湖南省促进经济发展、提升全要素生产率的重要举措。通过分析高质量发展目标下湖南省物流枢纽城市的现实基础与存在的问题,运用面板熵权法对湖南省五个重点物流枢纽城市进行综合评价,表明湖南省物流枢纽格局呈“一核多中心”分布,在此基础上提出完善物流基础、协同产业发展、强化数字驱动等方面的建议。

关键词：高质量发展物流枢纽城市综合评价发展对策

番鸭VIPR1和miR-317以及MAP3K7和miR-244靶向关系的研究

在线全文

学校读者我要写书评

暂无评论

中国家禽 2024年第6期46卷 15-19页

作者：李丽辛清武章琳俐缪中纬朱志明梁阿政郑嫩珠福建省农业科学院畜牧兽医研究所福建省畜禽遗传育种重点实验室福建福州350013 漳州昌龙农牧有限公司福建漳州363100

试验旨在验证番鸭就巢相关miRNA与靶基因靶向关系。试验利用miRanda、PITA和RNAhybrid三个软件的交集预测miR-317和miR-244靶基因,构建VIPR1-pmirGLO/MAP3K7-pmirGLO野生型和突变型双荧光素酶重组载体,将miR-317/VIPR1-Wt和miR-244/MAP3K7-Wt分别共转染至鸭胚成纤维细胞,检测双荧光素酶活性。结果显示:与miR-NC组相比,miR-317/VIPR1-Wt共转染组相对荧光值显著降低(P0.05),说明突变后完全抑制miR-317对VIPR1的结合作用,VIPR1与miR-317之间存在相互结合作用。与miR-NC组相比,miR-244/MAP3K7-Wt共转染组相对荧光值无显著性差异(P>0.05);MAP3K7突变后,miR-NC组与miR-244组的相对荧光值差异不显著(P>0.05),表明MAP3K7与miR-244之间不存在相互结合作用。研究提示,miR-317与VIPR1存在确切靶向结合位点,即VIPR1是miRNA miR-317的靶基因,而miR-244与MAP3K7不存在靶向关系。

关键词：番鸭就巢 miR-317 miR-244 MAP3K7 VIPR1