检索结果-南通市图书馆

制度创新与企业全要素生产率——来自中国自由贸易试验区的证据

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

软科学 2020年第10期34卷 76-83页

作者：吕洪燕孙喜峰齐秀辉齐齐哈尔大学经济与管理学院黑龙江齐齐哈尔161006 辽宁大学经济学院沈阳110036

基于2012~2018年中国A股上市公司数据,利用多期双重差分模型考察了自由贸易试验区制度创新对地区企业全要素生产率的影响。研究发现:自由贸易试验区的制度创新能够显著提升地区企业全要素生产率,这一结论通过稳健性检验,进一步消除选择... 详细信息

基于2012~2018年中国A股上市公司数据,利用多期双重差分模型考察了自由贸易试验区制度创新对地区企业全要素生产率的影响。研究发现:自由贸易试验区的制度创新能够显著提升地区企业全要素生产率,这一结论通过稳健性检验,进一步消除选择性偏差,以PSM-DID法对企业特征变量进行匹配后结论依然成立。异质性分析表明自由贸易试验区的制度创新对非国有企业全要素生产率的提升有显著的促进作用,而对于国有企业全要素生产率的提升作用并不显著。进一步机制分析表明自由贸易试验区的制度优势可以通过加强企业研发创新提高企业全要素生产率。

关键词：制度创新企业全要素生产率多期双重差分模型倾向得分匹配法

Investigation of non-thermal atmospheric plasma for the degradation of avermectin solution

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2021年第5期23卷 126-138页

作者： Yue lv Liang ZOU Huidong LI Zilei CHEN Xiaolong WANG Ying SUN Liping FANG Tong ZHAO Yuantao ZHANG School of Electrical Engineering Shandong UniversityJi’nan 250061People’s Republic of China Institute of Agricultural Quality Standards and Testing Technology Shandong Academy of Agricultural SciencesJi’nan 250061People’s Republic of China

Increasing concern with regard to food safety in the presence of pesticide residues(PRs) on the surface of agricultural products has resulted in the rapid development of practical degrading technologies for corresponding PRs. In this paper, an unconventional method of degrading pesticides, non-thermal atmospheric plasma(NTAP), was proposed to degrade the avermectin(AVM) in aqueous solution. Optical emission spectroscopy shows that NTAP, consisting of filamentary streamers, contains a variety of reactive oxygen species(ROS) that may interact with AVM. The high-performance liquid chromatography(HPLC)-MS/MS results indicate that the efficiency of AVM degradation seriously depends on multiple operation parameters of the NTAP,including the applied voltage, treatment time and gas flow rate. The maximum degradation rate of AVM was observed to be 97.47% after 240 s exposure under NTAP with an applied voltage of 18 kV and gas flow rate of 1 l min-1. Molecular dynamics simulation based on a reactive force field for the interaction between O(ground state atomic oxygen) and AVM was performed to analyze the underpinning mechanisms. The simulation result shows the possible pathways of the NTAPgenerated O degrading AVM by destroying the glycosyl group or fracturing the ester group.

关键词： non-thermal atmospheric plasma pesticide degradation avermectins molecular dynamics simulation

Dynamic Observation of Cartilage Damage and Serum IL-1β, TNF-α, IL-6 and IL-17 in Post-traumatic Rat Osteoarthritis Model

在线全文

学校读者我要写书评

暂无评论

Journal of Northeast Agricultural University(English Edition) 2022年第3期29卷 59-65页

作者： lv Liang-yu Ma Tian-wen Yu Yue Jia Li-na Xu Xin-yu Zhao Ming-chao Chen Hong Sheng Xuan-bo Li Ting Xiao Jian-hua Gao Li College of Veterinary Medicine Northeast Agricultural UniversityHeilongjiang Key Laboratory Animals and Comparative MedicineHarbin 150030China

The pathogenesis of animal osteoarthritis(OA)is not *** aim of this study was to investigate the dynamic changes of cartilage lesions and serum IL-1β,TNF-α,IL-6 and IL-17 inflammatory factors in a post-traumatic osteoarthritis model in rats,and to explore their values in monitoring the progression of *** male SD rats were randomly divided into the control group(n=20)and the model group(n=20).The OA model was established by anterior cruciate ligament transection combined with partial medial meniscus resection(ACLT+PMMx)in the model group,and sham operation was performed in the control *** the 0th,10th,20th and 30th days after modeling,the degree of joint swelling and the number of white blood cells in the peripheral blood were evaluated,and tibia samples were taken for macroscopic observation score and pathological *** serum levels ofIL-1β,TNF-α,IL-6 and IL-17 concentration were detected by enzyme-linked immunosorbent assay(ELISA).The results showed that the cartilage damage in the tibial surface and pathological observations of rats in the model group gradually increased with time,the eye scores increased and increased significantly on the 20th and 30th days(P<0.01),and the joints of the rats were *** the swelling was extremely significant on the 30th day(P<0.01).Compared with the control group,the number of white blood cells in the peripheral blood of the model group gradually increased,and the increase was extremely significant on the 20th and 30th days(P<0.01).The serum IL-17 concentration in the model group tended to increase,and the increase was significant on the 20th day(P<0.05)and extremely significant on the 30th day(P<0.01);the serum TNF-αand IL-1βconcentrations in the model group showed an increasing trend,and the increase was extremely significant on the 10th,20th and 30th days(P<0.01);IL-6 concentration in the serum of the model group showed an increasing trend,and it increased significantly on the 30th da

关键词： osteoarthritis inflammatory factor cartilage injury rat

Recommendation for Cardiac Magnetic Resonance Imaging-Based Phenotypic Study:Imaging Part

在线全文

学校读者我要写书评

暂无评论

Phenomics 2021年第4期1卷 151-170页

作者： Chengyan Wang Yan Li Jun lv Jianhua Jin Xumei Hu Xutong Kuang Weibo Chen He Wang Human Phenome Institute Fudan University825 Zhangheng RoadPudong New DistrictShanghai 201203China Department of Radiology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina School of Computer and Control Engineering Yantai UniversityYantaiChina School of Data Science Fudan UniversityShanghaiChina Philips Healthcare.Co. ShanghaiChina Institute of Science and Technology for Brain-Inspired Intelligence Fudan University220 Handan RoadYangpu DistrictShanghai 200433China Key Laboratory of Computational Neuroscience and Brain-Inspired Intelligence(Fudan University) Ministry of EducationShanghaiChina

Cardiac magnetic resonance(CMR)imaging provides important biomarkers for the early diagnosis of many cardiovascular diseases and has been reported to reveal phenome-wide associations of cardiac/aortic structure and functionality in popula-tion ***,due to the complexity of operation and variations among manufactural vendors,magnetic field strengths,coils,sequences,scan parameters,and image analysis approaches,CMR is rarely used in large cohort *** guidelines mainly focused on the diagnosis of cardiovascular diseases,which did not aim to basic *** purpose of this study was to propose a recommendation for CMR based phenotype measurements for cohort *** classify the imaging sequences of CMR into three categories according to the importance and universality of correspond-ing measurable *** acquisition time and repeatability of the phenotypic measurement were also taken into consideration during the *** other guidelines,this recommendation focused on quantitative measurement of large amount of phenotypes from CMR.

关键词： Cardiac imaging Magnetic resonance imaging Phenotype Standardization

Fuzzy identification of T-S model for beam stability control for electron gun

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

Nuclear Science and Techniques 2015年第5期26卷 20-26页

作者：吕彬苏海军李德明 Shanghai Institute of Applied Physics Chinese Academy of Sciences

In this paper, Takagi-Sugeno(T-S) fuzzy control is proposed for stabilizing the output beam of accelerators. To model the nonlinear system, we proposed a hybrid optimization algorithm based on quantum-inspired differential evolution and genetic algorithm. Based on the T-S model identified, the corresponding statefeedback fuzzy controller is designed. The method is applied to the La B6 electron gun system in the industrial radiation accelerator and the simulation results show its effectiveness.

关键词：稳定控制电子枪 T-S模型模糊辨识 T-S模糊模型非线性系统模糊控制器混合优化算法

Impact of Different Aerosols on the Evolution of the Atmospheric Boundary Layer

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2012年第2期5卷 82-87页

作者： Sun Dan Duan Min-Zheng lv Da-Ren Wang Pu-Cai Wang Yong Zhang Xiao-Ling Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Institute of Urban Meteorology China Meteorological Administration Beijing 100089 China

The present work analyzes the effect of aerosols on the evolution of the atmospheric boundary layer (ABL) over Shangdianzi in Beijing.A one-dimensional ABL model and a radiative transfer scheme are incorporated to develop the structure of the *** diurnal variation of the atmospheric radiative budget,atmospheric heating rate,sensible and latent heat fluxes,surface and the 2 m air temperatures as well as the ABL height,and its perturbations due to the aerosols with different single-scattering albedo (SSA) are studied by comparing the aerosol-laden atmosphere to the clean *** results show that the absorbing aerosols cause less reduction in surface evaporation relative to that by scatting aerosols,and both surface temperature and 2 m temperature decrease from the clean atmosphere to the aerosol-laden *** greater the aerosol absorption,the more stable the surface *** 12:00 am,the 2 m temperature increases for strong absorption *** the meantime,there is a slight decrease in the 2 m temperature for purely scattering aerosols due to radiative *** purely scattering aerosols decrease the ABL temperature and enhance the capping inversion,further reducing the ABL height.

关键词： aerosols atmospheric boundary layer radia-tion

Fine particulate matter(PM_(2.5)/PM_(1.0)) in Beijing,China: Variations and chemical compositions as well as sources

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第11期34卷 187-198页

作者： Lining Luo Xiaoxuan Bai Shuhan Liu Bobo Wu Wei Liu Yunqian lv Zhihui Guo Shumin Lin Shuang Zhao Yan Hao Jiming Hao Kai Zhang Aihua Zheng Hezhong Tian State Key Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Center for Atmospheric Environmental Studies Beijing Normal UniversityBeijing 100875China School of Environment Tsinghua UniversityBeijing 100084China Department of Environmental Health Sciences School of Public Health University at Albany State University of New York One University Place RensselaerNY 12144USA Analysis and Testing Center Beijing Normal UniversityBeijing 100875China

Particulate matter(i.e.,PM_(1.0) and PM_(2.5)),considered as the key atmospheric pollutants,exerts negative effects on visibility,global climate,and human health by associated chemical ***,our understanding of PM and its chemical compositions in Beijing under the current atmospheric environment is still not complete after witnessing marked alleviation during 2013–*** measurements can be crucial for further air quality improvement by better characterizing PM pollution and chemical compositions in ***,we conducted simultaneous measurements on PM in Beijing during 2018–*** indicate that annualmean PM_(1.0) and PM_(2.5) concentrations were 35.49±18.61μg/m^(3) and 66.58±60.17μg/m^(3),showing a positive response to emission *** contribution of sulfate,nitrate,and ammonium(SNA)played an enhanced role with elevated PM loading and acted as the main contributors to pollution *** observed among chemical species between PM_(1.0) and PM_(2.5) in spring suggest that sand particles trend to accumulate in the range of 1–2.5μ*** episodes occurred accompanied with southerly clusters and high formation of SNA by heterogeneous reactions in summer and winter,*** from positive matrix factorization(PMF)combined with potential source contribution function(PSCF)models showed that potential areas were seasonal dependent,secondary and vehicular sources became much more important compared with previous studies in *** study presented a continuous investigation on PM and sources origins in Beijing,which provides a better understanding for further emission control as well as a reference for other cities in developing countries.

关键词： Fine particles Haze Chemical species Seasonal variation Source apportionment

在线全文

学校读者我要写书评

暂无评论

视觉文化视域中的陇东农耕文化传播研究

陇东学院学报 2022年第4期33卷 33-36页

作者：吕超楠陇东学院美术学院甘肃庆阳745000

以视觉文化的相关理论审视陇东地区的农耕文化,发现文化传播视角中的陇东农耕文化在现当代文化形态中呈现一种“视觉传播”现象;具体表现为以“文化节”“电子媒介宣传”“旅游”“工艺展示”为主要方式的陇东农耕文化之视觉传播现象与... 详细信息

以视觉文化的相关理论审视陇东地区的农耕文化,发现文化传播视角中的陇东农耕文化在现当代文化形态中呈现一种“视觉传播”现象;具体表现为以“文化节”“电子媒介宣传”“旅游”“工艺展示”为主要方式的陇东农耕文化之视觉传播现象与行为。陇东农耕文化之视觉传播的动力主要有:农耕文化的现代渴望是陇东农耕文化视觉传播的时代动力;农耕文化的产业化发展需求是陇东农耕文化视觉传播的生产动力;政府行为则是陇东农耕文化视觉传播的国家力量。

关键词：视觉文化陇东农耕文化传播

生态链视域下职业教育产教深度融合的政策环境及其创设

在线全文

学校读者我要写书评

暂无评论

职业技术教育 2019年第19期40卷 61-66页

作者：吕银芳王志远祁占勇陕西学前师范学院教育科学学院西安710062 陕西师范大学教育学院

基于多重要素打造互联互动、共生共担的政策环境生态链是创设可持续职业教育产教深度融合政策环境的重要保障。目前,我国产教深度融合政策环境存在着经济环境内生动力不足、政治环境政策供给滞后、文化环境价值取向偏差、社会环境规则... 详细信息

基于多重要素打造互联互动、共生共担的政策环境生态链是创设可持续职业教育产教深度融合政策环境的重要保障。目前,我国产教深度融合政策环境存在着经济环境内生动力不足、政治环境政策供给滞后、文化环境价值取向偏差、社会环境规则意识不强、制度环境支持力度不够等问题。在生态链视域下,职业教育产教深度融合政策环境的创设要聚焦以共享为价值导向的产教深度融合政策理念、秉持以共存为基本遵循的产教深度融合政策原则、构建以共建为目标取向的产教深度融合政策机制、搭建以共治为行动指南的产教深度融合政策平台。

关键词：职业教育产教融合生态链政策环境