检索结果-南通市图书馆

民营企业家多元文化经历、企业家创新精神与企业创新投入

在线全文

学校读者我要写书评

暂无评论

软科学 2022年第12期36卷 81-88页

作者：郝盼盼白茹山西财经大学会计学院太原030006

基于手工搜集的民营企业家多元文化经历数据,选取2009—2019年在沪、深A股上市且研发创新具有代表性的制造业、信息技术业与科学研究和技术服务业民营企业为研究样本,采用面板回归、2SLS检验等方法研究民营企业家多元文化经历、企业家... 详细信息

基于手工搜集的民营企业家多元文化经历数据,选取2009—2019年在沪、深A股上市且研发创新具有代表性的制造业、信息技术业与科学研究和技术服务业民营企业为研究样本,采用面板回归、2SLS检验等方法研究民营企业家多元文化经历、企业家创新精神与企业创新投入之间的关系。结果发现:拥有多元文化经历的民营企业家会促进企业创新投入;风险偏好、企业家社会网络关系、机会识别、动态创新4个维度的企业家创新精神均起到了中介作用;多元文化经历广度和文化距离均会正向影响企业创新投入,且多元地域、多元企业及多元教育文化经历均对企业创新投入产生积极影响。

关键词：多元文化经历企业家创新精神企业创新投入

配筋聚乙烯醇纤维增强水泥复合材料梁的曲率延性

在线全文

学校读者我要写书评

暂无评论

复合材料学报 2020年第2期37卷 451-460页

作者：刘曙光白茹张菊闫长旺内蒙古工业大学土木工程学院呼和浩特010051 内蒙古工业大学矿业学院呼和浩特010051

聚乙烯醇纤维增强水泥(Polyvinyl alcohol fiber reinforced cement, PVA/C)复合材料具有优越的受拉应变硬化特性,可显著提高结构的变形能力。本文以PVA纤维体积分数和受拉钢筋配筋率为研究参数,对6根配筋PVA/C梁和2根普通混凝土梁(RC)... 详细信息

聚乙烯醇纤维增强水泥(Polyvinyl alcohol fiber reinforced cement, PVA/C)复合材料具有优越的受拉应变硬化特性,可显著提高结构的变形能力。本文以PVA纤维体积分数和受拉钢筋配筋率为研究参数,对6根配筋PVA/C梁和2根普通混凝土梁(RC)进行四点弯曲试验,并对其曲率延性进行了试验研究和理论分析。试验研究表明:配筋PVA/C梁的荷载-挠度(P-δ)关系曲线所包围的面积是C梁的1.64~2.43倍,证明配筋PVA/C梁有较好的持荷变形能力;在PVA纤维体积分数一定的情况下,试验梁的曲率延性系数随受拉钢筋配筋率的增大而减小;在受拉钢筋配筋率一定的情况下,配筋PVA/C梁的曲率延性系数是C梁的1.56~2.02倍,证明掺入PVA纤维显著提高了试验梁的延性。建立了配筋PVA/C梁曲率延性系数的计算公式,并分析了PVA纤维体积分数对受压区高度系数和曲率延性系数的影响,试验结果与计算结果吻合较好。

关键词：配筋聚乙烯醇纤维水泥复合材料梁聚乙烯醇纤维曲率延性系数受压区高度系数混凝土

Evaluating CMIP6 models in simulating the North Pacific decadal variability in sea surface salinity

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第8期67卷 2661-2680页

作者： Jian CHEN Hailong LIU Pengfei LIN Wenrong bai Chengzu bai Lu WANG Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China State Key Laboratory of Geo-Information Engineering Xi’an 710054China Beijing Municipal Climate Center Beijing Meteorological BureauBeijing 100089China Space System Department Equipment Department Beijing 100096China

The North Pacific sea surface salinity(SSS)decadal variability(NPSDV)and its potential forcing were evaluated from 25 coupled models of the Coupled Model Intercomparison Project phase 6(CMIP6)considering the prospects for decadal climate *** results indicated that the CMIP6 models generally reproduced the spatial patterns of *** large standard deviation of the SSS anomaly over the strong current regions,such as the Kuroshio-Oyashio Extension(KOE),North Pacific Current(NPC),California Current System(CCS),and Alaskan Coastal Current(ACC),is reflected in the two leading modes of NPSDV:a dipole with out-of-phase loadings in the KOE-NPC versus CCS-ACC and a monopole with positive loading over the *** order of modes is sensitive to individual models that exhibit discrepancies,especially in temporal phases and power *** autoregressive model of order-1 was used to reconstruct the NPSDV with several forcing *** generally weaker influence of forcings in an autoregressive model of order-1 is partly related to the overestimated response time of NPSDV relative to *** NPSDV variances originate from the persistence of SSS anomalies,but the dominant forcing factors are diverse among *** model diversity for the NPSDV simulation mainly arises from the influence of the tropical El Ni?o-Southern Oscillation through teleconnection on the North Pacific Oscillation or Aleutian Low with timescale ***,models that can reproduce the NPSDV well are not dependent on those with larger impacts from the North Pacific oceanic processes.

关键词： North Pacific Sea surface salinity Decadal variability CMIP6 Leading mode

在线全文

学校读者我要写书评

暂无评论

基于多色集合理论的印刷工艺规划建模研究

计算机应用 2009年第7期29卷 1970-1973页

作者：罗如柏周世生西安理工大学印刷包装工程学院西安710048

在研究印刷工艺的加工需求和加工工序的基础上,将计算机辅助工艺设计引入印刷制造系统,并应用多色集合理论建立印刷工艺规划的数学模型,提出了一种基于此模型的印刷工艺路径求解算法。此数学模型包括围道矩阵和多色图两部分。围道矩阵... 详细信息

在研究印刷工艺的加工需求和加工工序的基础上,将计算机辅助工艺设计引入印刷制造系统,并应用多色集合理论建立印刷工艺规划的数学模型,提出了一种基于此模型的印刷工艺路径求解算法。此数学模型包括围道矩阵和多色图两部分。围道矩阵描述了印刷工序实现印刷加工需求的关系,多色图描述了印刷工序的相互作用。该算法便于计算机编程的实现,能根据印刷加工需求搜索所需的工艺算子,然后求解出印刷品的印刷工艺路线。最后,通过简例分析,对所提出的模型与算法进行了验证。

关键词：多色集合多色图印刷工艺规划计算机辅助工艺设计

在线全文

学校读者我要写书评

暂无评论

日本灾后财政和债务前景展望

现代日本经济 2011年第6期30卷 1-6页

作者：那明白如纯合肥工业大学经济学院安徽合肥230009 中国社会科学院日本研究所北京100007

日本是发达经济体中财政赤字和政府债务负担最严重的国家。接二连三的欧洲主权债务危机和美国主权债务问题使市场不得不对日本是否将是下一个债务危机发生国产生隐忧。在2008年全球金融危机爆发前,日本的债务结构和低利率环境还可以使... 详细信息

日本是发达经济体中财政赤字和政府债务负担最严重的国家。接二连三的欧洲主权债务危机和美国主权债务问题使市场不得不对日本是否将是下一个债务危机发生国产生隐忧。在2008年全球金融危机爆发前,日本的债务结构和低利率环境还可以使其维系高额的财政赤字和债务负担。然而2008年之后,在全球经济疲软和日本经济萎靡不振的背景下,日本处在了主权债务风险一直上升的阶段。更令日本祸不单行的是"3.11"大地震、海啸和核泄露事件,这一连串灾难更令日本在财政赤字和举债问题上如履薄冰。如果日本政府还不尽快实施有效的债务管理政策和可信的财政整顿计划,短期日本经济会难于运转,中长期日本将爆发主权债务危机。

关键词：财政赤字债务负担主权债务危机债务管理金融危机

Microphysical Insights into a Tornadic Supercell from Dual-Polarization Radar Observations in Jiangsu, China on 14 May 2021

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2024年第2期38卷 303-320页

作者： Chao YUAN Yang bai Pengfei SUN Hua bai Lu XIA China Meteorological Administration Tornado Key Laboratory Foshan 528315 Institute of Atmospheric Environment China Meteorological AdministrationShenyang 110166 Panjin National Climate Observatory Panjin 124010 Yangzhou Meteorological Bureau of Jiangsu Province Yangzhou 225100 Yichun Meteorological Bureau of Heilongjiang Province Yichun 153000

Tornadoes are incredibly powerful and destructive natural events,yet the microphysical characteristics of the parent storm and its effects on tornadogenesis remain *** study analyzed polarization radar data of a tornadic supercell that occurred in Jiangsu Province of China on 14 May 2021,in comparison with another tornadic supercell and two non-tornadic supercells that occurred in the same region in *** two tornadic supercells exhibited lower differential reflectivity(ZDR)in the hook echo region compared with the non-tornadic supercells,indicating smaller median drop sizes.A distinct increase in ZDR from the melting of frozen hydrometeors,observed between2.5-and 4.0-km altitude in the non-tornadic storms,was absent in the tornadic *** non-tornadic supercells also displayed substantially higher specific differential phase(KDP)below the melting level,likely aroused from enhanced melting and *** findings suggest fundamental microphysical contrasts between tornadic and nontornadic ***,tornadic supercells have smaller droplets and may reduce melting in hook ***,greater separation between the ZDR arc and the KDP foot was observed during *** vertical gradient of KDP related to the cooling pool strength of the hook echo,regulating rear-flank downdraft *** the limited number of cases investigated,the findings of this study indicate that monitoring ZDR,KDP,and drop size distribution trends could assist with tornado prediction and warnings.

关键词： tornado polarimetric radar supercell hook echo drop size distribution

Effect of stress-relief annealing on thermal fatigue cracks for die-casting die steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第5期31卷 1164-1176页

作者： Zhi-xiong bai Xiao-chun Wu School of Materials Science and Engineering Shanghai UniversityShanghai200444China

The effect of stress-relief annealing at different stages of thermal fatigue tests on crack growth was investigated using a self-built thermal cycle *** results showed that annealing could limit crack expansion *** reduced dislocation density and released the accumulation of residual *** addition,the strain accumulation in carbides was reduced by this *** was also found that double annealing was even more effective at inhibiting crack expansion compared to single stress-relief *** 1000 cycles,the maximum crack length was reduced by 31.1%and 45.2%for the samples after using the optimal single and double annealing processes,*** single stress-relief annealing,earlier annealing provides more benefit in delaying crack ***,effective double stress-relief annealing requires a suitable time interval between the annealing ***,after 800 cycles,surface hardness decreased significantly accompanied by an increase in the size and number of carbides,and cracks expanded predominantly along grain boundaries.

关键词： Thermal fatigue Steel Carbide Stress-relief annealing Dislocation Residual stress

Evolution of pore systems in low-maturity oil shales during thermal upgrading--Quantified by dynamic SEM and machine learning

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

Petroleum Science 2024年第3期21卷 1739-1750页

作者： Jun Liu Xue bai Derek Elsworth Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065SichuanChina International Quantum Academy Shenzhen518048GuangdongChina Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055GuangdongChina Department of Energy and Mineral Engineering Pennsylvania State University ParkPA 16802USA

In-situ upgrading by heating is feasible for low-maturity shale oil,where the pore space dynamically *** characterize this response for a heated substrate concurrently imaged by *** systematically follow the evolution of pore quantity,size(length,width and cross-sectional area),orientation,shape(aspect ratio,roundness and solidity)and their anisotropy—interpreted by machine *** indicate that heating generates new pores in both organic matter and inorganic ***,the newly formed pores are smaller than the original pores and thus reduce average lengths and widths of the bedding-parallel pore ***,the average pore lengths and widths are increased in the bedding-perpendicular ***,heating increases the cross-sectional area of pores in low-maturity oil shales,where this growth tendency fluctuates at300℃.In addition,the orientation and shape of the newly-formed heating-induced pores follow the habit of the original pores and follow the initial probability distributions of pore orientation and ***,limited anisotropy is detected in pore direction and shape,indicating similar modes of evolution both bedding-parallel and *** propose a straightforward but robust model to describe evolution of pore system in low-maturity oil shales during heating.

关键词： Low-maturity oil shale Pore elongation Organic matter pyrolysis In-situthermal upgrading Scanning electron microscopy(SEM) Machine learning

温和灸对中老年部分雄激素缺乏综合征大鼠模型影响的实验研究

在线全文

学校读者我要写书评

暂无评论

针刺研究 2007年第4期32卷 229-233,236页

作者：白如鑫李沛福建中医学院福州350003

目的:观察温和灸对于中老年部分雄激素缺乏综合症(PADAM)模型大鼠生殖内分泌的影响。方法:根据测定大鼠血清的总睾酮(TT)和血清游离睾酮(FT)的水平,选择符合标准PADAM的中老年SD大鼠模型30例,按照随机分组的原则分为3组:艾灸组(灸"肾俞"... 详细信息

目的:观察温和灸对于中老年部分雄激素缺乏综合症(PADAM)模型大鼠生殖内分泌的影响。方法:根据测定大鼠血清的总睾酮(TT)和血清游离睾酮(FT)的水平,选择符合标准PADAM的中老年SD大鼠模型30例,按照随机分组的原则分为3组:艾灸组(灸"肾俞""命门""关元")、对照组Ⅰ(丙酸睾丸素组)、对照组Ⅱ(模型组),并测定各组治疗后血清中TT和FT的水平,观察各组大鼠一般情况的变化及通过悬尾实验和力竭游泳实验及取得其相关脏器指数等评价大鼠的自身状况,进行统计分析。结果:两治疗组经治疗后血清中TT、FT的含量较治疗前均显著提高(P0.05),而模型组FT显著下降(P<0.05)。两治疗组经治疗后悬尾实验不动时间均显著缩短(P<0.05),力竭游泳实验时间与模型组比较显著延长(P<0.01)。结论:温和灸法可阻止PADAM大鼠血TT、FT的下降,减轻腹部脂肪堆积,调节免疫功能,改善抑郁状态和肌张力,其作用与丙酸睾丸素相当。

关键词：温和灸 PADAM 丙酸睾丸素血清总睾酮血清游离睾酮