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创新生态系统视角下企业数字化转型研究述评与展望

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科技进步与对策 2024年第13期41卷 151-160页

作者：李律成曾媛杰柯小俊武汉理工大学创业学院湖北武汉430070 华中科技大学新闻与信息传播学院湖北武汉430074

近年来,企业数字化转型成为学界研究热点,主要聚焦企业主体视角下数字化转型过程与结果。然而,数字化转型是一项复杂系统工程,现有研究对创新系统复杂性与主体交互性的考虑不足,未基于系统观构建理论框架。利用CiteSpace对国内外企业数... 详细信息

近年来,企业数字化转型成为学界研究热点,主要聚焦企业主体视角下数字化转型过程与结果。然而,数字化转型是一项复杂系统工程,现有研究对创新系统复杂性与主体交互性的考虑不足,未基于系统观构建理论框架。利用CiteSpace对国内外企业数字化转型相关研究进行文献计量分析,基于创新生态系统视角从微观企业层面(技术进步、组织变革、绩效影响)、中观产业层面(同群效应、平台赋能、产业升级)、宏观国家层面(政策支持、文化营造、社会风险)对相关研究进行梳理与评述,构建创新生态系统视角下企业数字化转型研究框架。结果表明:企业数字化转型研究主题呈现从微观企业层面向中观产业层面与宏观国家层面拓展的趋势。同时,上述3个层面的研究主题相互关联,构成立体式数字化转型研究体系。最后,从创新系统层面对未来研究方向进行展望,并提出中国情境下企业数字化转型议题,展示企业数字化转型研究脉络,深化企业数字化转型理论认知,推动该领域研究深入发展。

关键词：数字化转型数字创新创新生态系统文献综述文献计量分析

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高性能混凝土三向受压力学性能试验研究

混凝土 2024年第2期 64-67页

作者：杨渊张绮雯罗松俭柯晓军广西建工第一建筑工程集团有限公司广西南宁530001 广西大学土木建筑工程学院广西南宁530004

设计了60个不同围压及混凝土强度的高性能混凝土圆柱体试样进行常规三轴受压试验,以研究其在三向应力下的力学性能。结果表明:试件在单、三向受压状态下分别发生纵向劈裂、斜向剪切破坏;试样应力-应变曲线可分为:弹性上升段、塑性上升... 详细信息

设计了60个不同围压及混凝土强度的高性能混凝土圆柱体试样进行常规三轴受压试验,以研究其在三向应力下的力学性能。结果表明:试件在单、三向受压状态下分别发生纵向劈裂、斜向剪切破坏;试样应力-应变曲线可分为:弹性上升段、塑性上升段、软化下降段。其中,软化下降段比单轴受压状态更平滑,表明延性更高;随着侧向压力的增加,试件弹性模量、峰值应力及峰值应变均显著增大;最后由最小二乘法建立了侧向压力关于峰值应力、峰值应变的计算式。

关键词：高性能混凝土三轴受压破坏特征力学性能

RC框架梁端负弯矩纵筋部分置于梁侧楼板对性能的影响及构造问题分析

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建筑结构 2024年第6期54卷 74-77,31页

作者：郑宏宇黄林普柯晓军许成浩范博文广西大学土木建筑工程学院工程防灾与结构安全教育部重点实验室南宁530004

为适应建筑多功能、大跨度、重荷载、高抗震的发展要求,框架梁端部负弯矩纵筋配筋率通常较高,节点区钢筋过于密集,混凝土施工质量不易保证,对结构综合性能有不利影响。先对梁端负弯矩纵筋部分设置于梁侧楼板内(简称APNRFS)的布筋方式进... 详细信息

为适应建筑多功能、大跨度、重荷载、高抗震的发展要求,框架梁端部负弯矩纵筋配筋率通常较高,节点区钢筋过于密集,混凝土施工质量不易保证,对结构综合性能有不利影响。先对梁端负弯矩纵筋部分设置于梁侧楼板内(简称APNRFS)的布筋方式进行阐述,然后基于试验结果分析探讨了该配筋方式对结构性能带来的变化及相关构造问题。研究表明:梁端采用APNRFS布筋方式一般不会降低框架梁的承载力;梁端的弯曲变形能力和结构抗震性能有一定提高;移至板内的梁负筋布置宽度宜小于有效翼缘宽度范围;移至板内的梁端负筋宜同时兼作楼板负筋;横向分布筋参与受力,设计中应适当增配。

关键词：钢筋混凝土框架梁负弯矩纵筋楼板钢筋布置剪力滞

Highly cycle-stable VOPO_(4)-based cathodes for magnesium ion batteries:Insight into the role of interlayer engineering in batteries performance

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Nano Research 2024年第7期17卷 6127-6138页

作者： Jiahe Zhang Jing Shang xiaojun Zhang ke Wang Yihe Zhang Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences(Beijing)Beijing 100083China

It is the sluggish ion migration kinetics that seriously affects the practical performance of the magnesium ion *** though an electrode material design using rational interlayer engineering method could effectively solve this issue,the optimal interlayer distance remains ***,various VOPO_(4)-based electrodes with expanded interlayer spacing were fabricated and the relationship between interlayer structure and battery performance was *** analysis combined with computations unveils the existence of an optimal interlayer structure,as inadequate expansion failed to fully utilization of the material performance,while excessive expansion degraded the electrode *** them,the electrode with triethylene glycol(TEG)intercalation exhibited optimized performance,maintaining excellent cycling stability(191.3 mAh·g^(−1)after 800 cycles).Density functional theory(DFT)demonstrated the effectiveness and limitations to lowering the migration energy barrier by expanding the interlayer *** addition,systematic mechanism research revealed the Mg^(2+)storage process:The stepwise shuttling of Mg^(2+)along the directions that lie in(001)plane triggers two pairs of redox processes,namely V^(5+)/V^(4+)and V^(4+)/V^(3+).This study,regulation of layer spacing to achieve the best integrated performance of electrodes,could deepen the understanding of interlayer engineering and guide the design of advanced multivalent-ion batteries.

关键词： magnesium ion batteries layered electrodes interlayer engineering energy storage mechanisms high kinetics

Experimental and numerical study of buckling-restrained braces configured with out-of-plane eccentricity under cyclic loading

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 957-971页

作者： Cao, Yongsheng Zhou, Yun Takagi, Jiro Jiang, ke Deng, Xuesong Fang, xiaojun Earthquake Engineering Research & Test Center Guangzhou University Guangzhou China Guangdong Provincial key Laboratory of Earthquake Engineering and Applied Technology Guangzhou China key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education Guangzhou China School of Civil Engineering Guangzhou University Guangzhou China Graduate School of Urban Environmental Sciences Tokyo Metropolitan University Tokyo Japan Department of Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand

This study focuses on variations in the hysteretic behavior of buckling-restrained braces (BRBs) configured with or without out-of-plane eccentricity under cyclic loading. Quasi-static experiments and numerical simulations were carried out on concentrically and eccentrically loaded BRB specimens to investigate the mechanical properties, energy dissipation performance, stress distribution, and high-order deformation pattern. The experimental and numerical results showed that compared to the concentrically loaded BRBs, the stiffness, yield force, cumulated plastic ductility (CPD) coefficient, equivalent viscous damping coefficient and energy dissipation decreased, and the yield displacement and compression strength adjustment factor increased for the eccentrically loaded BRBs. With the existence of the out-of-plane eccentricity, the initial yield position changes from the yield segment to the junction between the yield segment and transition segment under a tensile load, while the initial high-order buckling pattern changes from a first-order C-shape to a second-order S-shape under a compressive load.

关键词： buckling-restrained brace out-of-plane eccentricity experiment numerical simulation mechanical properties

加载角度对T形SRC短肢剪力墙承载力的影响

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华中科技大学学报（自然科学版） 2020年第5期48卷 49-54页

作者：柯晓军陈世杰广西大学土木建筑工程学院广西南宁530004 广西大学工程防灾与结构安全教育部重点实验室广西南宁530004

为解决方向随机的地震作用下异形短肢剪力墙损伤机理复杂的问题,通过3片T形截面型钢混凝土(SRC)短肢剪力墙进行拟静力试验,利用有限元软件DIANA进行60种工况下的数值计算,研究水平加载角度、轴压比和剪跨比对墙肢受力性能的影响.研究结... 详细信息

为解决方向随机的地震作用下异形短肢剪力墙损伤机理复杂的问题,通过3片T形截面型钢混凝土(SRC)短肢剪力墙进行拟静力试验,利用有限元软件DIANA进行60种工况下的数值计算,研究水平加载角度、轴压比和剪跨比对墙肢受力性能的影响.研究结果表明:与沿0°方向加载试件相比,沿45°方向加载试件的水平承载力降低、延性和抗倒塌能力提高,增大剪跨比更为显著;试件水平承载力受轴压比的影响不大,但与加载角度的相关性较强.以加载角度0°为基准,正向承载力在0°~50°范围内相对稳定,在51°~90°范围内逐渐降低,变幅约在-25%~8%之间;以加载角度180°为基准,负向承载力逐渐上升、稳定再逐渐降低的临界点依次为130°和150°,变幅约在-23%~14%之间.

关键词：短肢剪力墙 T形截面型钢混凝土(SRC) DIANA软件加载角度

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钢管混凝土组合柱受剪承载力分析模型

工程科学与技术 2021年第3期53卷 125-131页

作者：柯晓军丁文广西大学土木建筑工程学院广西南宁530004 广西大学工程防灾与结构安全教育部重点实验室广西南宁530004

为分析钢管混凝土组合柱构件受剪承载力,通过组合柱受剪试验研究,探讨采用桁架-斜压场理论计算受剪承载力的适用性,并与中国规范T/CECS 188、美国规范AISC、欧洲规范EC4进行对比分析。其中,修正桁架-斜压场模型是基于管内外混凝土不同... 详细信息

为分析钢管混凝土组合柱构件受剪承载力,通过组合柱受剪试验研究,探讨采用桁架-斜压场理论计算受剪承载力的适用性,并与中国规范T/CECS 188、美国规范AISC、欧洲规范EC4进行对比分析。其中,修正桁架-斜压场模型是基于管内外混凝土不同约束条件,以钢管为界划分构件截面区域,且考虑了轴压力作用下,钢管约束对管内混凝土强度的影响。研究表明:修正桁架-斜压场理论分析方法的计算结果与36组试验数据吻合度高,不仅能够较好反映组合柱构件的受剪机理,且模型计算敏感性受剪跨比、体积配箍率、混凝土强度、轴压比、套箍指标和钢管径厚比等变化参数的影响不大,绝大部分试件的计算值与试验值比值介于0.85~1.15。采用中国规范T/CECS 188的计算值普遍低于试验值,未能准确预估构件的实际承载力;采用美国规范AISC、欧洲规范EC4的计算值的离散性较大。

关键词：钢管混凝土组合柱受剪承载力修正桁架–斜压场模型

Experimental and numerical study of buckling-restrained braces configured with out-of-plane eccentricity under cyclic loading

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Earthquake Engineering and Engineering Vibration 2024年第04期 957-971页

作者： Cao Yongsheng Zhou Yun Takagi Jiro Jiang ke Deng Xuesong Fang xiaojun Earthquake Engineering Research&Test Center Guangzhou University Guangdong Provincial key Laboratory of Earthquake Engineering and Applied Technology key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural Safety Ministry of Education School of Civil Engineering Guangzhou University Graduate School of Urban Environmental Sciences Tokyo Metropolitan University Department of Civil and Natural Resources Engineering University of Canterbury

This study focuses on variations in the hysteretic behavior of buckling-restrained braces(BRBs) configured with or without out-of-plane eccentricity under cyclic loading. Quasi-static experiments and numerical simulations were carried out on concentrically and eccentrically loaded BRB specimens to investigate the mechanical properties, energy dissipation performance, stress distribution, and high-order deformation pattern. The experimental and numerical results showed that compared to the concentrically loaded BRBs, the stiffness, yield force, cumulated plastic ductility(CPD) coefficient, equivalent viscous damping coefficient and energy dissipation decreased, and the yield displacement and compression strength adjustment factor increased for the eccentrically loaded BRBs. With the existence of the out-of-plane eccentricity, the initial yield position changes from the yield segment to the junction between the yield segment and transition segment under a tensile load, while the initial high-order buckling pattern changes from a first-order C-shape to a second-order S-shape under a compressive load.

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Effects of dense planting patterns on photosynthetic traits of different vertical layers and yield of wheat under different nitrogen rates

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The Crop Journal 2024年第2期12卷 594-604页

作者： Cuicun Wang ke Zhang Qing Liu Xiufeng Zhang Zhikuan Shi Xue Wang Caili Guo Qiang Cao Yongchao Tian Yan Zhu xiaojun Liu Weixing Cao National Engineering and Technology Center for Information Agriculture Nanjing Agricultural UniversityNanjing 210095JiangsuChina MOE Engineering Research Center of Smart Agricultural Nanjing Agricultural UniversityNanjing 210095JiangsuChina MARA key Laboratory for Crop System Analysis and Decision Making Nanjing Agricultural UniversityNanjing 210095JiangsuChina Jiangsu key Laboratory for Information Agriculture Nanjing Agricultural UniversityNanjing 210095JiangsuChina Institute of Smart Agriculture Nanjing Agricultural UniversityNanjing 210095JiangsuChina

A two-year field experiment was conducted to measure the effects of densification methods on photosynthesis and yield of densely planted ***-plant and inter-row distances were used to define ratefixed pattern(RR)and row-fixed pattern(RS)density ***,four nitrogen(N)rates(0,144,192,and 240 kg N ha-1,termed N0,N144,N192,and N240)were applied with three densities(225,292.5,and 360×10^(4)plants ha^(-1),termed D225,D292.5,and D360).The wheat canopy was clipped into three equal vertical layers(top,middle,and bottom layers),and their chlorophyll density(Ch D)and photosynthetically active radiation interception(FIPAR)were *** showed that the response of Ch D and FIPAR to N rate,density,and pattern varied with different layers.N rate,density,and pattern had significant interaction effects on Ch *** maximum values of whole-canopy Ch D in the two seasons appeared in N240 combined with D292.5 and D360 under RR,*** two growing seasons,FIPAR values of RR were higher than those of RS by 29.37%for the top layer and 5.68%for the middle layer,while lower than those of RS by 20.62%for the bottom layer on *** a low N supply(N0),grain yield was not significantly affected by density for both *** N240,increasing density significantly increased yield under RR,but D360 of RS significantly decreased yield by 3.72%and 9.00%versus D225 in two seasons,*** an appropriate and sufficient N application,RR increased the yield of densely planted wheat more than ***,the maximum yield in two seasons appeared in the combination of D360 with N144 or N192 rather than of D225 with N240 under both patterns,suggesting that dense planting combined with an appropriate N-reduction application is feasible to increase photosynthesis capacity and yield.

关键词： Chlorophyll density Densification method Nitrogen Photosynthetically active radiation interception Wheat