检索结果-南通市图书馆

The Impact of Digital Finance on High-Quality Development of the Chengdu-Chongqing Economic Circle

在线全文

学校读者我要写书评

暂无评论

Contemporary Social Sciences 2024年第2期9卷 1-15页

作者： Wei Liangyi bai xiaobo Li Qin Sichuan Academy of Social Sciences ChengduSichuan610072China Central University of Finance and Economics

This paper developed a comprehensive evaluation system that was able to quantify the levels of high-quality development across the cities within the Chengdu-Chongqing economic circle,and investigate the impact that digital finance had on the cities’high-quality development and the underlying mechanisms through which it achieved *** comprehensive evaluation system was constructed using statistical data from these cities for the period 2014 to 2020 while also taking China’s high-quality development philosophy into *** key findings revealed that:(a)Digital finance was able to significantly promote high-quality development in the Chengdu-Chongqing economic circle;(b)Digital finance had a significant positive effect in promoting innovative,coordinated,green,open,and shared development;(c)Digital finance was able to stimulate the high-quality development in the Chengdu-Chongqing economic circle by boosting entrepreneurial dynamism;(d)Digital finance had a significant impact on the high-quality development of the axis areas,while its impact was less discernible in non-axis *** insights from this research offer a deeper understanding of the factors that drive high-quality development,the role digital finance plays,and the mechanisms through which digital finance is able to propel high-quality development at the city cluster scale.

关键词： digital finance Chengdu-Chongqing economic circle high-quality development

Effects of Binder Phase Content and Substrate Hardness on Deposition Behavior of Cermet Particles in Cold Spraying Process

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2012年第S1期41卷 384-387页

作者： Wang Hongtao Ji Gangchang Chen Xiao Chen Qinyu bai xiaobo Jiujiang Univ JiuJiang Key Lab Green Remfg Jiujiang 332005 Peoples R China

In this paper,three kinds of cermet particles with different binder phase and content,namely WC-12Co,WC-17Co and Cr3C2-25NiCr were deposited on the Q235 low carbon steel and WC-12Co coating substrates to investigate the effect of binder phase content and substrate hardness on deposition behavior of cermet particle during cold *** morphology of the deposited particles was examined by scanning electron microscopy(SEM)from the particle surface and *** was found that with increasing substrate hardness,the deposition behavior of cermet particles transformed from completely embedding into substrate to partially flattening and even *** the Co content from 12 wt%to 17 wt% influenced significantly the deposition deformation behavior of the WC-Co particles,the higher Co content brought about a fuller flattening of WC-Co ***,Cr3C2-25NiCr particle exhibited the relatively lower flattening ratio and significant rebounding of Cr3C2 even with the highest binder phase content,which may be attributed to the bigger Cr3C2 size and weak bonding between Cr3C2 and NiCr.

关键词： cold spraying ball milling aluminum matrix composites microstructure

Substantial thermoelectric enhancement achieved by manipulating the band structure and dislocations in Ag and La co-doped SnTe

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2021年第4期10卷 860-870页

作者： Wenjing XU Zhongwei ZHANG Chengyan LIU Jie GAO Zhenyuan YE Chunguang CHEN Ying PENG xiaobo bai Lei MIAO Guangxi Key Laboratory of Information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsSchool of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo 135-8548Japan

Eco-friendly SnTe based thermoelectric materials are intensively studied recently as candidates to replace PbTe;yet the thermoelectric performance of SnTe is suppressed by its intrinsically high carrier concentration and high thermal *** this work,we confirm that the Ag and La co-doping can be applied to simultaneously enhance the power factor and reduce the thermal conductivity,contributing to a final promotion of figure of *** one hand,the carrier concentration and band offset between valence bands are concurrently reduced,promoting the power factor to a highest value of-2436μW·m^(-1)·K^(-2) at 873 *** the other hand,lots of dislocations(~3.16×10^(7)mm^(-2))associated with impurity precipitates are generated,resulting in the decline of thermal conductivity to a minimum value of 1.87 W·m^(-1)·K^(-1) at 873 *** a result,a substantial thermoelectric performance enhancement up to zT≈1.0 at 873 K is obtained for the sample Sn0.94Ag0.09La0.05Te,which is twice that of the pristine SnTe(zT≈0.49 at 873 K).This strategy of synergistic manipulation of electronic band and microstructures via introducing rare earth elements could be applied to other systems to improve thermoelectric performance.

关键词： SnTe band convergence dislocation Ag and La co-doping thermoelectric performance

Carrier and microstructure tuning for improving the thermoelectric properties of Ag_(8)SnSe_(6)via introducing SnBr_(2)

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第7期11卷 1144-1152页

作者： Zhonghai YU Xiuxia WANG Chengyan LIU Yiran CHENG Zhongwei ZHANG Ruifan SI xiaobo bai Xiaokai HU Jie GAO Ying PENG Lei MIAO Guangxi Key Laboratory of Information Materials Electronical Information Materials and Devices Engineering Research Center of Ministry of EducationSchool of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China

The argyrodite compounds(2 A(12)/B X6 m n n^(m+)+--(Am+=Li^(+),Cu^(+),and Ag^(+);Bn^(+)=Ga^(3+),Si^(4+),Ge^(4+),Sn^(4+),P^(5+),and As^(5+);and X^(2−)=S^(2−),Se^(2−),or Te^(2−)))have attracted great attention as excellent thermoelectric(TE)materials due to their extremely low lattice thermal conductivity(κl).Among them,Ag_(8)SnSe_(6)-based TE materials have high potential for TE ***,the pristine Ag_(8)SnSe_(6)materials have low carrier concentration(<1017 cm^(−3)),resulting in low power *** this study,a hydrothermal method was used to synthesize Ag_(8)SnSe_(6)with high purity,and the introduction of SnBr_(2)into the pristine Ag_(8)SnSe_(6)powders has been used to simultaneously increase the power factor and decrease the thermal conductivity(κ).On the one hand,a portion of the Br−ions acted as electrons to increase the carrier concentration,increasing the power factor to a value of~698 mW·m^(−1)·K^(−2)at 736 *** the other hand,some of the dislocations and nanoprecipitates(SnBr_(2))were generated,resulting in a decrease ofκl(~0.13 W·m^(−1)·K^(−1))at 578 *** a result,the zT value reaches~1.42 at 735 K for the sample Ag8Sn1.03Se5.94Br0.06,nearly 30%enhancement in contrast with that of the pristine sample(~1.09).The strategy of synergistic manipulation of carrier concentration and microstructure by introducing halogen compounds could be applied to the argyrodite compounds to improve the TE properties.

关键词： Ag_(8)SnSe_(6) thermoelectric(TE)performance lattice thermal conductivity SnBr_(2) introduction hydrothermal method

Superior multiphase interfaces in AgCuTe-based composite with significantly enhanced thermoelectric properties

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

Journal of Advanced Ceramics 2023年第8期12卷 1511-1520页

作者： Wenpei Li Zhonghai Yu Chengyan Liu Ying Peng Baoquan Feng Jie Gao Guojing Wu xiaobo bai Junliang Chen Xiaoyang Wang Lei Miao Guangxi Key Laboratory of Information Materials Electronical Information Materials and Devices Engineering Research Center of Ministry of EducationSchool of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory of Precision Navigation Technology and Application School of Information and CommunicationGuilin University of Electronic TechnologyGuilin 541004China

It is common sense that a phase interface(or grain boundary)could be used to scatter phonons in thermoelectric(TE)materials,resulting in low thermal conductivity(k).However,a large number of impurity phases are always so harmful to the transport of carriers that poor TE performance is ***,we demonstrate that numerous superior multiphase(AgCuTe,Ag_(−2)Te,copper telluride(Cu_(2)Te and Cu_(2−x)Te),and nickel telluride(NiTe))interfaces with simultaneous strong phonon scattering and weak electron scattering could be realized in AgCuTe-based TE *** to the similar chemical bonds in these phases,the depletion region at phase interfaces,which acts as carrier scattering centers,could be ***,the power factor(PF)is obviously enhanced from~609 to~832μW·m^(−1)·K^(−2),and k is simultaneously decreased from~0.52 to~0.43 W·m^(−1)·K^(−1) at 636 ***,a peak figure of merit(zT)of~1.23 at 636 K and an average zT(zTavg)of~1.12 in the temperature range of 523–623 K are achieved,which are one of the best values among the AgCuTe-based TE *** study could provide new guidance to enhance the performance by designing superior multiphase interfaces in the TE materials.

关键词： thermoelectric(TE)materials AgCuTe phase interface carrier scattering phonon scattering

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

多工况条件下滚针轴承的改进粒子群优化方法

计算机辅助设计与图形学学报 2014年第10期26卷 1900-1908页

作者：白晓波吉晓民胡刚西安理工大学艺术与设计学院工业设计系西安710048

为了获得在复杂工况下滚针轴承的最优尺寸参数,提出了一种利用改进粒子群算法优化滚针轴承尺寸参数的方法.在考虑了污染、载荷、润滑、转速、游隙、倾斜、滚针修形等工况的前提下,建立了以滚针轴承额定修正寿命为目标函数的有约束优化模... 详细信息

为了获得在复杂工况下滚针轴承的最优尺寸参数,提出了一种利用改进粒子群算法优化滚针轴承尺寸参数的方法.在考虑了污染、载荷、润滑、转速、游隙、倾斜、滚针修形等工况的前提下,建立了以滚针轴承额定修正寿命为目标函数的有约束优化模型;采用随机权重策略改进惯性权重值,以反余弦策略来调整学习因子大小,用保证粒子合法性的方法求解约束的问题,从而实现了多工况下滚针轴承非线性优化设计;最后通过对优化结果进行对比分析,验证了该方法是一种有效的轴承设计方法.

关键词：滚针轴承额定修正寿命改进粒子群算法尺寸优化设计

在线全文

学校读者我要写书评

暂无评论

纳米羟基磷灰石/钛复合粒子冷喷沉积行为

稀有金属 2018年第12期42卷 1332-1338页

作者：陈枭白小波纪岗昌邹岩龙新余学院机电工程学院江西新余338004 九江学院江西省表面绿色再制造工程技术中心江西九江332005

运用冷喷涂技术在不同喷涂温度和不同硬度基体上沉积单个纳米羟基磷灰石/钛(nHA/Ti)复合粒子,研究喷涂温度与基体硬度对复合粒子冷喷沉积行为的影响规律。采用扫描电子显微镜(SEM)观察沉积后复合粒子的表面形貌及结合形态,结合能谱分析(... 详细信息

运用冷喷涂技术在不同喷涂温度和不同硬度基体上沉积单个纳米羟基磷灰石/钛(nHA/Ti)复合粒子,研究喷涂温度与基体硬度对复合粒子冷喷沉积行为的影响规律。采用扫描电子显微镜(SEM)观察沉积后复合粒子的表面形貌及结合形态,结合能谱分析(EDS)沉积后复合粒子中HA的Ca/P比。结果表明,基体为Ti6Al4V和316L不锈钢基体时,粒子碰撞后发生了一定的塑性变形呈现中部隆起的扁平状,粒子周边出现了环形薄带。随着加速气体温度升高,复合粒子变形程度有所增加;基体为HA+Ti涂层基体时,碰撞后粒子呈现近球形嵌入至涂层基体中,随着加速气体温度升高,复合粒子嵌入至涂层基体中深度有所增加,粒子在基体表面粘附率增加。通过对沉积后复合粒子中HA的Ca/P比发现,冷喷沉积后复合粒子中的Ca/P比与原始粉末中基本相同。

关键词：冷喷涂加速气体温度基体硬度 Ca/P 沉积行为

广义带多参Bézier-like曲面及其拼接条件

在线全文

学校读者我要写书评

暂无评论

计算机集成制造系统 2016年第2期22卷 501-515页

作者：胡钢吉晓民白晓波西安理工大学理学院陕西西安710054 西安理工大学机械与精密仪器工程学院陕西西安710048

基于一组带形状参数的Bernstein-like基函数,提出一种带多形状参数的高次广义Bézier-like曲面,该曲面既继承了高次Bézier曲面的许多性质,又具有十分灵活的形状可调性,特别是以高次Bézier曲面为其特殊情形;详细分析了Bézier-like曲... 详细信息

基于一组带形状参数的Bernstein-like基函数,提出一种带多形状参数的高次广义Bézier-like曲面,该曲面既继承了高次Bézier曲面的许多性质,又具有十分灵活的形状可调性,特别是以高次Bézier曲面为其特殊情形;详细分析了Bézier-like曲面的基本性质,讨论了该曲面形状参数的几何意义和一些特殊曲面的构造;为解决工程复杂曲面难以用单一曲面构造的问题,进一步研究了广义Bézier-like曲面的拼接技术,推导了相邻两片广义Bézier-like曲面间G1光滑拼接的几何条件,给出了拼接的具体步骤与实例,并分析了形状参数对拼接后曲面形状的影响规律。数值实例表明,所提方法不仅简单有效、易实现,而且形状方便可调,对CAD/CAM系统中复杂曲面的设计是一种有力的补充。

关键词：拟伯恩斯坦基函数拟Bézier曲面形状参数几何连续

在线全文

学校读者我要写书评

暂无评论

远程视频传输在采砂执法中的应用

中国水利 2009年第8期 29-29,34页

作者：白晓波上海市水务行政执法总队上海200081

近年，长江河道采砂执法逐渐成为长江中下游各省（自治区、直辖市）水行政执法的重点和难点。采砂管理涉及面广、管理难度大，违章采砂活动严重，暴力抗法时有发生。随着执法力度的提高，对于事件现场的实时情况取证比以往更为重要。

关键词：执法系统视频