检索结果-南通市图书馆

African swine fever and meat prices fluctuation:An empirical study in China based on TVP-VAR model

Journal of Integrative Agricul.ure 2021年第8期20卷 2289-2301页

作者： lI Hui-shang Hu Chen-pei lÜZheng lI Mei-qi GuO xin-zhu Agricul.ural Information Institute/Key laboratory of Big Agri-Data of Ministry of Agricul.ure and Rural Affairs Chinese Academy of Agricultural SciencesBeijing 100081P.R.China International Statistical Information Center National Bureau of StatisticsBeijing 100826P.R.China School of Statistics and Mathematics Central University of Finance and EconomicsBeijing 100081P.R.China

African swine fever(ASF),a fatal disease outbroken in China in August 2018,has widely attracted social concern especially in the information *** occurrence of ASF led to an imbalance between supply and demand in pork and other meat *** a result,meat prices fluctuated greatly during the past year in *** measure ASF quantitatively,the internet public concern index about ASF was created using web crawler *** relationships between ASF and meat prices were analyzed based on time-varying parameter vector auto-regressive(TVP-VAR)*** results showed that there were some differences in the impact size,direction and duration of ASF on the prices of pork,chicken,beef and mutton,and the characteristics of time variability and heterogeneity were *** the same time,the impact of ASF on meat prices is not consistent with the trend and degree of *** impulse intensity is strongly correlated with the strength and duration of ASF,and it is generally weak in the early stage and much stronger in the middle and late *** results indicate that macro regulations,monitoring and early-warning system,standardizing production and circulation,and the public opinion monitoring and guidance about ASF should be given more attention in future to stabilize the market expectations and to promote a smooth functioning of the livestock markets.

关键词： African swine fever meat prices dynamic transmission TVP-VAR model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Verbascoside exerts an anti-atherosclerotic effect by regulating liver glycerophospholipid metabolism

引用

Food Science and Human Wellness 2023年第6期12卷 2314-2323页

作者： Peng lei Jialin lü Tie Yao Peng Zhang xin Chai Yuefei Wang Miaomiao Jiang State Key laboratory of Component-based Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Key laboratory of Pharmacology of Traditional Chinese Medicine Formulae Ministry of EducationTianjin University of Traditional Chinese MedicineTianjin 301617China

Verbascoside,abundant in olive mill wastewater,is a phenylethanolic glycoside with a wide range of pharmacological ***(AS)is a common metabolic disease and abnormal lipid metabolism in liver is inseparable from its formation and *** this study,the anti-atherosclerotic effect of verbascoside was evaluated by establishing an atherosclerosis model based on western diet feeding of apolipoprotein E-defi cient mice for 16 *** 12 weeks of administration during the feeding period,the levels of total cholesterol(TC),triglyceride(TG),low density lipoprotein cholesterol(lDl-C)in the plasma of mice were signifi cantly decreased,the formation of arterial plaques was delayed,and the levels of alanine aminotransferase(AlT),aspartate aminotransferase(AST)and lactate dehydrogenase(lDH)in plasma were alleviated,showing the hepatoprotective *** addition,based on untargeted lipidomic analysis,verbascoside stabilized glycerophospholipid metabolism,modulated lipid metabolism disorders and reduced lipid deposition in the liver to achieve the therapeutic effi cacy against atherosclerosis by regulating cardiolipin(Cl),ether-linked phosphatidylcholine(ether-PC),lysophophatidylcholine(lPC),phosphatidylcholine(PC),oxidized phosphatidylcholine(OxPC),oxidized phosphatidylethanolamine(OxPE),triacylglycerol(TG),sphingomyelin(SM)back to normal levels.

关键词： Atherosclerosis Verbascoside lipid deposition lipidomics Glycerophospholipid metabolism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

相干与路径信息

引用

物理学报 2020年第7期69卷 11-16页

作者：吕鑫六盘水师范学院物理与电气工程学院六盘水553000

近年来,随着对相干性量化的发展,相干与路径信息间的互补关系渐渐引起人们注意.这样的互补关系不仅在基础量子力学方面有重要的理论意义,同时也在量子信息技术中有实际应用.本文从Bures距离和明确量子态区分出发,系统地研究了二路径干... 详细信息

近年来,随着对相干性量化的发展,相干与路径信息间的互补关系渐渐引起人们注意.这样的互补关系不仅在基础量子力学方面有重要的理论意义,同时也在量子信息技术中有实际应用.本文从Bures距离和明确量子态区分出发,系统地研究了二路径干涉仪中的相干与路径信息,并建立了一个全新的互补关系.与已知的类似工作相比,本文的研究更为一般:既考虑纯态,也考虑混合态;既探讨了干涉仪本身的路径不对称性所提供的路径可预测性,也探讨了因路径探测器而生的路径可区分度.具体地说,路径可预测性的讨论只依赖于密度矩阵的半正定性质,而路径可区分度的讨论还需要利用保真度和Schur-Weyl不等式等工具.

关键词：相干互补性波粒二象性明确量子态区分

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Improvement of mechanical properties of Sn-58Bi alloy with multi-walled carbon nanotubes

引用

中国有色金属学会会刊：英文版 2012年第S3期22卷 692-696页

作者： HE Peng lü Xiao-chun lIN Tie-song lI Hai-xin AN Jing MA xin FENG Ji-cai ZHANG Yan lI Qi QIAN Yi-yu State Key laboratory of Advanced Welding and Joining Harbin Institute of Technology Department of Materials Science and Engineering Shenzhen Graduate SchoolHarbin Institute of Technology Yik Shing Tat Industrial Company limited CNano Technology (Beijing) limited

Carbon nanotubes (CNTs) reinforced Sn-58Bi composites were successfully fabricated through ball-milling method and low temperature melting *** influence of multi-walled carbon nanotubes (MWCNTs) on the mechanical strength and ductility of Sn-58Bi lead-free alloy was *** mechanical test results show that the bending strength of Sn-58Bi-0.03CNTs (mass fraction,%) composite is increased by 10.5% than that of the Sn-58Bi alloy,which can be attributed to the reduction of Sn-rich segregation and the grain *** toughness of Sn-58Bi-0.03CNTs composite is increased by 48.9% than that of the matrix *** is indicated that the influence of CNTs on the strength of Sn-58Bi-xCNTs composite is *** addition,the fracture mechanism of CNTs reinforced Sn Bi composite was *** corresponding fracture surface comparison between the Sn-58Bi-0.03CNTs composite and the monolithic Sn-58Bi alloy was made to identify the influence of CNTs on the fracture behavior and the reinforcing effect of CNTs.

关键词： carbon nanotubes metal-matrix composites mechanical properties fracture mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tensor Charge of the Nucleon from QCD Sum Rules

引用

Chinese Physics letters 1996年第12期13卷 889-892页

作者： HE Han-xin China Institute of Atomic Energy Beijing 102413 also Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080

The nucleon's tensor charges(isovector g_(T)^(v)=δu-δd and isoscalar g_(T)^(s)=δu+δd)are cal.ulated using the QCD(quantum chromodynamics)sum rules in the presence of an external tensor *** combining the mass sum rule of nucleon,we derive a simplified form for proton tensor charges,which gives g_(T)^(v)=1.27 and g_(T)^(s)=1.31,or δu=1.29 and δd=0.02 at the scale of nucleon mass,with an uncertainty about 20%.

关键词： field tensor charges

来源：

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

Sustainable graywater reuse for residential landscape irrigation-a critical review

引用

Chinese Journal of Population,Resources and Environment 2015年第3期13卷 250-264页

作者： u.Pinto B.l.Maheshwari School of Science & Health University of Western Sydney

The demand for potable water is rising rapidly due to an ever-increasing population,economic activities,and dwindling water *** provide adequate water supplies in the future,understanding the issues and challenges in the reuse of water and developing appropriate strategies for reuse will be *** way to augment water supplies for residential.use is to reuse graywater- the wastewater from kitchens,bathrooms,and *** this article,we critically review the evolution of water reuse,the definition of graywater,graywater reuse practices,volumes and flow in different situations,and graywater *** then examine the issues associated with different graywater treatment methods and how using graywater for irrigation around homes affects soil quality and plant *** study concludes that graywater treatment costs,human health risks,and its effect on soil quality are some of the challenges that need to be addressed in the future for widespread and sustainable reuse of graywater for irrigation around homes.

关键词： water reuse graywater irrigation sustainability urban water water treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

lindeberg's central limit theorems for martingale-like sequences under sub-linear expectations

引用

Science China Mathematics 2021年第6期64卷 1263-1290页

作者： li-xin Zhang School of Mathematical Sciences Zhejiang UniversityHangzhou 310027China

The central limit theorem of martingales is the fundamental tool for studying the convergence of stochastic processes,especially stochastic integrals and differential *** this paper,the central limit theorem and the functional central limit theorem are obtained for martingale-like random variables under the sub-linear *** applications,the lindeberg's central limit theorem is obtained for independent but not necessarily identically distributed random variables,and a new proof of the lévy characterization of a GBrownian motion without using stochastic cal.ulus is *** proving the results,Rosenthal's inequality and the exponential inequality for the martingale-like random variables are established.

关键词： capacity central limit theorem functional central limit theorem martingale difference sub-linear expectation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

WOlA滤波器组信道化接收机技术

引用

电子科技大学学报 2008年第1期37卷 43-46页

作者：王洪吕幼新汪学刚电子科技大学电子工程学院成都610054

多相DFT滤波器组是实现信道化接收机的一种高效结构,但是该结构要求信道数目与抽取倍数必须相等,限制了接收机参数设计的灵活性。该文将WOlA滤波器组引入信道化接收机,以信号的平移代替窗函数的平移,对加权、叠接、相加后的信号进行DFT... 详细信息

多相DFT滤波器组是实现信道化接收机的一种高效结构,但是该结构要求信道数目与抽取倍数必须相等,限制了接收机参数设计的灵活性。该文将WOlA滤波器组引入信道化接收机,以信号的平移代替窗函数的平移,对加权、叠接、相加后的信号进行DFT变换,实现了多相DFT滤波器组的相同功能,又解除了抽取倍数与信道数目的约束关系,是多相DFT滤波器组的一种推广形式。仿真结果验证了WOlA滤波器组在实现信道化接收机时的有效性。

关键词：信道化接收机多相DFT滤波器组短时傅里叶变换 WOlA滤波器组

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Financial Resources Allocation and Its Economic Impact in Belt and Road Countries

引用

Social Sciences in China 2022年第2期43卷 125-143页

作者： li xin Tao Ran Zhou lü Shao Yanan School of Finance Capital University of Economics and Business the School of Foreign languages at Tianjin Chengjian university

The purpose of this paper is to explore a model of efficient allocation of financial resources in China and other Belt and Road countries to ensure it plays the most effective economic *** terms of financial resources,this paper uses a fixed effects model to conduct an empirical study of 2006-2019 panel data on the financial resources of Belt and Road *** paper finds that the role of financial resources varies from country to country along the Belt and Road.1) In some regions,increased bank credit is playing a less important role in driving the economy;2) Securities markets have an important role in promoting economic growth;3) The insurance industry has great potential for economic development;4) Foreign direct investment has boosted economic *** we need to face up to the fact that the role of financial resources in economic growth varies from country to country along the Belt and Road,so we need to formulate the corresponding strategies to optimize financial resources and promote the sustainable development of Belt and Road economies.

关键词： financial resources Belt and Road Initiative economic growth panel data

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Compressive properties of a novel slurry-infiltrated fiber concrete reinforced with arc-shaped steel fibers

引用

Journal of Zhejiang university-Science A(Applied Physics & Engineering) 2023年第6期24卷 543-556页

作者： Hedong lI Yabiao lI Yunfeng PAN P.l.NG Christopher K.Y.l.uNG xin ZHAO School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhou 310018China Department of Civil Engineering The University of Hong KongHong Kong 999077China Faculty of Civil Engineering Vilnius Gediminas Technical UniversityVilnius LT-10223Lithuania Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China

Slurry-infiltrated fiber concrete(SIFCON)is a sort of strain hardening cement-based composite material,typically made with 5%–20%steel *** study focused on a novel type of SIFCON in which hooked-end steel fibers were replaced by arc-shaped steel *** quasi-static compressive properties of the SIFCON were first *** results suggested that using arc-shaped steel fibers in lieu of hooked-end steel fibers increased the quasi-static compressive strength by 47.1%and the strain at peak stress by 56.3%.We attribute these improvements to new crack-resisting mechanisms,namely“fiber crosslock”,“dual bridging”,and“confinement loops”,when the arc-shaped steel fibers are introduced into *** high impact resistance is a special property of SIFCON that is of practical significance,the dynamic compressive properties of arc-shaped steel fiber SIFCON were studied by using an 80-mm-diameter split Hopkinson pressure bar(SHPB).The results showed that the dynamic compressive strength,dynamic increase factor(DIF),and dynamic toughness of SIFCON all increased with the strain *** SIFCON incorporating arc-shaped steel fibers proved to have significant advantages in structural applications requiring high impact resistance.

关键词： Slurry-infiltrated fiber concrete(SIFCON) Arc-shaped steel fiber Quasi-static compressive properties Spilt Hopkinson pressure bar(SHPB) Dynamic compressive properties

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：