检索结果-南通市图书馆

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

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 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 applications.However,the pristine Ag_(8)SnSe_(6)materials have low carrier concentration(<1017 cm^(−3)),resulting in low power factors.In 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 K.On 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 K.As 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

Identification and characterization of ZIP transporters from dwarf polish wheat(Triticum polonicum L.)

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

Identification and characterization of ZIP transporters from...

金融科技对小额贷款公司杠杆率的影响机制研究

第八届全国小麦基因组学及分子育种大会

作者： Yulin Jiang Chao Wang Ruijiao Wang yiran cheng Songyue Chai Wendi Shuai Yonghong Zhou Yi Wang Triticeae Research Institute Sichuan Agricultural University

In plants,increasing studies confirmed that the zinc-regulated transporters and iron-regulated transporter-like proteins(ZIPs) uptake and transport divalent metal ion and balance their homeostasis.To date,identification and characterization of ZIPs from wheat is still lacking.In the current study,six ZIPswere isolated from dwarf polish wheat(Triticum polonicum L.,AABB),and individually named as TpIRT1,TpZIP3,TpZIP6,TpZIP7,TpZIP8 and TpZIP9.Their different isoforms from A and B genome were identified,respectively.Most of TpZIPs have eight transmembrane(TM) domains,a highly conserved ZIP signature motif,anda variable region between TM-3 and TM-4.Yeast complementation analysis revealed that TpZIP3-A and TpZIP9-B increased the Zn sensitive in Zn-sensitive mutant(Δymc243).Expressing these genes in Cd-sensitivemutant(Δydr135) cells,TpZIP6 complemented the mutant;TpZIP3-A2,TpIRT1 and TpZIP9 increased the sensitive.Expressing in Co-sensitive mutant(Ayk40) cells,TpZDP3-B1,TpZIP6-A,TpZDP7-B2 and TpZIP9-A restored the growth of Ayk40 cells;while,TpIRTl and TpZIP3-A increased the sensitive.These results indicated that TpZIPs differentially function as Zn,Cd or Co transporters.

关键词： ZIP transporters Dwarfpolish wheat Zinc Cadmium Yeast

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

证券市场导报 2021年第7期 21-29页

作者：程毅然李永建西南交通大学经济管理学院四川成都610031 成都金控融资租赁有限公司四川成都610041

提升金融科技发展水平是提升普惠金融服务效率和质量的重要手段。小额贷款公司是我国普惠金融机构的重要组成部分,研究金融科技发展的影响具有重要理论和实践意义。本文在理论研究的基础上,采用零壹智库基于CRITIC方法,利用2010―2018... 详细信息

提升金融科技发展水平是提升普惠金融服务效率和质量的重要手段。小额贷款公司是我国普惠金融机构的重要组成部分,研究金融科技发展的影响具有重要理论和实践意义。本文在理论研究的基础上,采用零壹智库基于CRITIC方法,利用2010―2018年相关数据,构建各省金融科技发展指数进行实证检验。研究结果表明,金融科技发展对小额贷款公司杠杆率的影响存在“U”型非线性关系,金融科技发展的影响存在拐点,低于拐点时抑制小贷公司杠杆率,超过拐点后促进小贷公司杠杆率;其机制在于,金融科技抑制金融分权,促进科技创新、智能设备普及和银行网点增加,从而抑制或促进小贷公司杠杆率。

关键词：金融科技普惠金融小额贷款杠杆率小贷公司

老年人数字化社会网络利用困境与人际幸福感的关系

在线全文

学校读者我要写书评

暂无评论

循证护理 2022年第24期8卷 3339-3343页

作者：成一然郝习君陈长香华北理工大学护理与康复学院河北063210

目的:了解老年人数字化社会网络利用情况现状以及对人际幸福感的影响。方法:于2021年8月—2022年4月选取直属于唐山市工人医院所属的社区服务中心的辖区年龄≥60岁的老年人,采用自行设计的数字化网络利用情况调查表、人际幸福感量表进... 详细信息

目的:了解老年人数字化社会网络利用情况现状以及对人际幸福感的影响。方法:于2021年8月—2022年4月选取直属于唐山市工人医院所属的社区服务中心的辖区年龄≥60岁的老年人,采用自行设计的数字化网络利用情况调查表、人际幸福感量表进行入户访谈。结果:老年人人际幸福感中低水平者占66.2%。社区老年人数字化社会网络利用困境各条目不能完成率为27.2%~69.3%。多因素分析显示,婚姻状况、经济水平满意度、性格、自评健康、不能在医院公众号预约挂号等就医、不能在养生群中分享健康保健知识是社区老年人人际幸福感的影响因素。结论:老年人应用数字化社会网络困境,尤其是就医困境和分享健康保健知识困境影响人际幸福感,应提升老年人数字化社会网络利用水平。

关键词：老年人数字化社会网络人际幸福感社区护理

运动干预联合“教师式”监督预防COPD患者骨骼肌功能障碍的效果分析

在线全文

学校读者我要写书评

暂无评论

护理实践与研究 2022年第7期19卷 1018-1022页

作者：郭欣欣吴洁程怡然席芳郑州大学人民医院(河南省人民医院)老年医学科河南省郑州市450000

目的探讨运动干预联合“教师式”监督预防慢性阻塞性肺疾病(COPD)稳定期患者骨骼肌功能障碍的价值。方法选取2019年1月—2020年12月收治的COPD患者160例为研究对象,按照组间基线资料可比的原则分为观察组与对照组,各80例。对照组给予... 详细信息

目的探讨运动干预联合“教师式”监督预防慢性阻塞性肺疾病(COPD)稳定期患者骨骼肌功能障碍的价值。方法选取2019年1月—2020年12月收治的COPD患者160例为研究对象,按照组间基线资料可比的原则分为观察组与对照组,各80例。对照组给予常规运动护理,观察组给予运动干预联合“教师式”监督护理方法。对比两组6 min步行实验(6MWT)、股四头肌最大收缩力(QWVC)、手握力(HGS)、肺功能及生活质量。结果两组患者干预前运动耐力与FEV;水平比较,差异无统计意义(P>0.05);干预后两组6 min步行距离与FEV;均提升,且观察组高于对照组,差异有统计意义(P<0.05);干预后两组QWVC与HGS水平均提高,且观察组高于对照组,差异有统计意义(P<0.05);干预后两组生活质量得分均高于干预前,观察组得分高于对照组,差异有统计意义(P<0.05)。结论运动干预结合“教师式”监督法能够改善COPD稳定期患者的运动耐力、肺功能及骨骼肌功能状态,提升患者生活质量。

关键词：运动干预 “教师式”监督慢性阻塞性肺疾病骨骼肌功能障碍运动耐力

Microstructure,elastic/mechanical and thermal properties of CrTaO_(4):A new thermal barrier material?

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2024年第3期13卷 373-387页

作者： Shuang Zhang Xiaohui Wang Chao Zhang Huimin Xiang Yingwei Li cheng Fang Mingliang Li Hailong Wang Yanchun Zhou School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Civil Engineering Wuhan UniversityWuhan 430072China

CrTaO_(4)(or Cr_(0.5)Ta_(0.5)O_(2))has been unexpectedly found to play a decisive role in improving the oxidation resistance of Cr and Ta-containing refractory high-entropy alloys(RHEAs).This rarely encountered complex oxide can effectively prevent the outward diffusion of metal cations from the RHEAs.Moreover,the oxidation kinetics of CrTaO_(4)-forming RHEAs is comparable to that of the well-known oxidation resistant Cr_(2)O_(3)-and Al_(2)O_(3)-forming Ni-based superalloys.However,CrTaO_(4)has been ignored and its mechanical and thermal properties have yet to be studied.To fill this research gap and explore the untapped potential for its applications,here we report for the first time the microstructure,mechanical and thermal properties of CrTaO_(4)prepared by hot-press sintering of solid-state reaction synthesized powders.Using the HAADF and ABF-STEM techniques,rutile crystal structure was confirmed and short range ordering was directly observed.In addition,segregation of Ta and Cr was identified.Intriguingly,CrTaO_(4)exhibits elastic/mechanical properties similar to those of yttria stabilized zirconia(YSZ)with Young’s modulus,shear modulus,and bulk modulus of 268,107,and 181 GPa,respectively,and Vickers hardness,flexural strength,and fracture toughness of 12.2±0.44 GPa,142±14 MPa,and 1.87±0.074 MPa·m^(1/2).The analogous elastic/mechanical properties of CrTaO_(4)to those of YSZ has spurred inquiries to lucrative leverage it as a new thermal barrier material.The measured melting point of CrTaO_(4)is 2103±20 K.The anisotropic thermal expansion coefficients areα_(a)=(5.68±0.10)×10^(-6)K^(-1),α_(c)=(7.81±0.11)×10^(-6)K^(-1),with an average thermal expansion coefficient of(6.39±0.11)×10^(-6)K^(-1).The room temperature thermal conductivity of CrTaO_(4)is 1.31 W·m^(-1)·K^(-1)and declines to 0.66 W·m^(-1)·K^(-1)at 1473 K,which are lower than most of the currently well-known thermal barrier materials.From the perspective of matched thermal expansion coefficient,CrTaO_(4)pertains to an eligible thermal barrier material fo

关键词： microstructure synthesis thermal conductivity thermal expansion coefficient melting point CrTaO_(4) mechanical and thermal 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

商品中知识密集程度的测度

科技管理研究 2019年第3期39卷 246-251页

作者：丁胜利李永建程毅然西南交通大学经济管理学院四川成都610031

针对关于商品中知识密集程度的计量分析不充分问题,提出以知识量表征商品中知识密集程度的原理和方法。通过案例说明商品中知识密集程度的测度方法,计算出汽车发动机修理和自行车维修两种服务的知识密集程度和换算比例:如果前者的知识... 详细信息

针对关于商品中知识密集程度的计量分析不充分问题,提出以知识量表征商品中知识密集程度的原理和方法。通过案例说明商品中知识密集程度的测度方法,计算出汽车发动机修理和自行车维修两种服务的知识密集程度和换算比例:如果前者的知识密集程度定为100%,则后者只有4.07%。由此实现知识密集具有量的可比性,为商品及企业的知识密集程度测度提供思路和方法。

关键词：知识密集程度知识门槛知识量

智慧赋能云端设计——寒地乡村建筑计算性设计研究

在线全文

学校读者我要写书评

暂无评论

新建筑 2024年第1期 4-8页

作者：周亦然孙澄韩昀松哈尔滨工业大学建筑与设计学院寒地城乡人居环境科学与技术工业和信息化部重点实验室哈尔滨150081

面向乡村振兴和建筑工业化国家重大需求,聚焦国内乡村建筑设计痛点问题,基于建筑计算性设计思维,立足人工智能时代语境,综合应用文图生成与建筑信息建模等技术,提出了可实现云端交互的乡村建筑计算性设计方法,构建了乡村建筑云端计算性... 详细信息

面向乡村振兴和建筑工业化国家重大需求,聚焦国内乡村建筑设计痛点问题,基于建筑计算性设计思维,立足人工智能时代语境,综合应用文图生成与建筑信息建模等技术,提出了可实现云端交互的乡村建筑计算性设计方法,构建了乡村建筑云端计算性设计平台,最终实现基于数据链生态的产业多赢模式,发挥人工智能技术优势,支撑乡村建筑设计、建造和运维过程,并结合案例实践介绍了平台应用效果,助力乡村建筑设计的信息化升级与工业化转型。

关键词：计算性设计乡村振兴装配式建筑绿色建筑

Recent progress in synthesis and properties of 2D room-temperature ferromagnetic materials

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第11期66卷 3054-3069页

作者： Lixuesong Han Tingting cheng yiran Ding Mengqi Zeng Lei Fu College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

Two-dimensional(2D)ferromagnetic materials have important applications in optics,spintronics,biomedicine,and energy conversion fields.To achieve higher integration and continue Moore's Law,it is necessary to search for 2D ferromagnetic materials.However,the low Curie temperature(Tc)of most 2D ferromagnetic materials seriously hinders their practical applications.Therefore,the search for room-temperature 2D ferromagnetic materials is of great significance for the advancement of technological applications.This article provides a systematic and comprehensive review of the synthesis methods of room-temperature 2D ferromagnetic materials that have been discovered and created to date,as well as an overview of the physical properties of the 2D ferromagnetic materials.Finally,the challenges and prospects of the room-temperature 2D ferromagnetic materials in the fields of synthesis and application are briefly summarized.

关键词： two-dimensional ferromagnetic room-temperature synthesis