课程文献中心 更多>>

关键词： 数字乡村   数字技术   农民创业活跃度   农民收入  

摘要： 基于2011—2018年全国省际面板数据构建回归模型,考察数字乡村的农民增收效应,同时探究农民创业活跃度在其中的调节作用及其区域异质性。结果表明,数字乡村对农民收入增长具有显著促进作用,主要通过互联网、电商平台、普惠金融等方式得以实现,而且农民创业活跃度对数字乡村增收效应的调节作用存在异质性,这源于农民创业活跃度易受区域资源禀赋、地理条件状况和经济发展水平等影响,若要充分发挥农民创业活跃度在数字乡村促进农民增收中的调节作用,需要对我国东、中、西部地区采取不同的措施,从而实现农民增收目的。

关键词： 分析师关注   企业社会责任   公司价值   有中介的调节作用  

摘要： 以2010-2017年上市公司为研究样本,实证检验分析师关注对公司价值的影响路径。通过构建有中介的调节作用模型,采用重新抽样自助法检验表明:分析师关注能够提高企业社会责任,企业社会责任的履行对于公司价值具有促进作用;分析师关注在产权性质的调节下以企业社会责任为中介影响公司价值。研究结论有助于厘清分析师关注对公司价值的作用机理,构建完善的内外部公司治理机制和信息披露机制,从而提高企业价值。

关键词： 共享平台   医技检验检查   结果互认   医疗管理   现状  

摘要： 分析部分地区医学检验检查互认工作发展现状以及受阻原因,从功能模块、搭建运维、参与主体、科技支撑等方面阐述医技共享平台构建,以促进实现检验检查结果互认。

关键词： 田间检验   油菜种子   种子认证   全程机械化   制种田   引领作用   襄阳   全国农技中心  

摘要： 3月20~21日,全国农技中心在湖北省襄阳市举办了油菜种子认证田间检验暨现场观摩活动,组织开展了油菜种子认证田间检验,观摩了高质量种子认证田和全程机械化制种田,总结交流了试点示范工作经验成效,研究提出了全面实施种子认证工作的思路和重点。

关键词： 电子商务   乡村振兴   农民增收   农村创业  

摘要： 本文将清华大学电子商务交易技术国家工程实验室等机构联合发布的"中国电子商务发展指数"与2016年和2018年中国家庭追踪调查(CFPS)数据库进行匹配,从需求与供给有效对接的角度考察了电子商务的发展对农村家庭增收的作用。研究结果表明:首先,电子商务的发展显著提高了农户的收入,且这种促进作用还有助于缩小农村内部收入差距和城乡收入差距;其次,电子商务的发展有助于缓解信息不对称,显著提升了城镇居民与衣食相关的消费水平,为扩大农村电商产品市场规模打下基础,推动了农村居民的就业和创业。最后,本文还考察了电商发展对农村家庭增收的异质性作用,发现从事乡村产业、家庭成员平均受教育程度更高的家庭和农村固定资产投资更高的地区更受益于电子商务的发展。

关键词： 检验实验室   质量体系   监督和控制   食品检测   检验检测   参与性   最大限度   管理水平  

摘要： 近年来,随着科学技术的不断进步和快速发展,人们的生活水平越来越高,对食品的需求也越来越多样化。而食品作为人们日常生活以及生存中必不可少的重要组成部分,其质量一旦不达标,就可能会引起严重的事故。因此,食品的检验检测工作至关重要,会直接影响到食品的质量安全。构建食品检验实验室的根本目的就是为了保证食品的安全质量检测效果,但由于目前的质量体系并不是很完善,相关人员的整体参与性普遍较差,缺少对质量管理的监督和控制,所以食品检验实验室的整体管理水平并不是很高。基于此,本文分析了质量体系在食品检验实验室管理中的作用,只有对质量体系进行不断完善和优化,在保证质量体系应用作用和价值有所发挥的基础上,才能最大限度保证食品检测质量的提升。

关键词： 动物检验检疫   食品安全   作用  

摘要： 动物检验检疫可以从源头上确保动物食品的安全,对保护人们的健康,促进社会的和谐稳定发展具有重要意义。为了加强动物检验检疫工作,应从提高人力专业水平、加强宣传、完善有关制度等各个方面着手,以促进食品工业的健康发展。

关键词： Student-faculty interactions   Career attitudes   Higher education  

摘要： This study examined the relationship between student-faculty interaction in college and students' fourth-year career attitudes toward professional success. Results suggest that some interactions with faculty, such as frequency of student-faculty interaction, are positively associated with students' fourth-year career attitudes toward professional success. Other interactions, such as personal discussions with faculty and research with a faculty member, are negatively associated with certain attitudes about professional success such as students' desire to make a lot of money. These mixed findings suggest that faculty may have a role to play in shaping students' career attitudes, but that interactions with faculty, depending on the type and context of the interaction, may encourage or discourage students' attitudes regarding professional success.

关键词： Autism spectrum disorder   Autism diagnostic observation schedule   Conditional random forest   Functional connectivity   fMRI   Symptom severity   Machine learning   Heterogeneity  

摘要： Autism spectrum disorders (ASDs) are heterogeneous neurodevelopmental conditions. In fMRI studies, including most machine learning studies seeking to distinguish ASD from typical developing (TD) samples, cohorts differing in gender and symptom severity composition are often treated statistically as one 'ASD group.' Using resting-state functional connectivity (FC) data, we implemented random forest to build diagnostic classifiers in four ASD samples including a total of 656 participants (N-ASD = 306,N-TD = 350, ages 6-18). Groups were manipulated to titrate heterogeneity of gender and symptom severity and partially overlapped. Each sample differed on inclusionary criteria: (1) all genders, unrestricted severity range;(2) only male participants, unrestricted severity;(3) all genders, higher severity only;and (4) only male participants, higher severity. Each set consisted of 200 participants per group (ASD, TD;matched on age and head motion): 160 for training and 40 for validation. FMRI time series from 237 regions of interest (ROIs) were Pearson correlated in a 237 x 237 FC matrix, and classifiers were built using random forest in training samples. Classification accuracies in validation samples were 62.5%, 65%, 70%, and 73.75%, respectively, for samples 1-4. Connectivity within cingulo-opercular task control (COTC) network, and between COTC ROIs and default mode and dorsal attention network contributed overall most informative features, but features differed across sets. Findings suggest that diagnostic classifiers vary depending on ASD sample composition. Specifically, greater homogeneity of samples regarding gender and symptom severity enhances classifier performance. However, given the true heterogeneity of ASDs, performance metrics alone may not adequately reflect classifier utility.

关键词： Thermostimulated exo-electron emission   Desorption   UV irradiation   Low temperature   KBr  

摘要： Potassium bromide (KBr) is a material with many potential uses in various branches of physics and technology (in scintillators, for a Fourier spectrometer, electro-optical elements such as IR laser windows, sensors and optical fibers). We conducted a series of combined measurements of thermally stimulated exo-electron emission (TSEE) and thermally stimulated desorption (TSD). At low doses of UV irradiation, the most prominent process is the combined emission of negative charges with desorption of the components of O, H2O and mainly K, KOH and Br, as described below. At higher irradiation doses, the KBr F-center plays the most important role (Tm =160 degrees C) and at temperatures above +200 degrees C also the decomposition of chemically bonded atoms and other components occurs. This process is accompanied by the corresponding emission of electrons and at the same time some of the already chemically bonded structures such as HBr3 are released. TSD maxima are defined and the same temperature maxima for TSD and TSEE are shown, mainly at the already mentioned higher temperatures. These maxima are linked to the defects and interactions in the surface layer. The obtained results fully confirm the applicability of our apparatus for combined measurements of TSD, TSEE, thermally stimulated luminescence (TSL) and possibly also thermally stimulated conductivity (TSC).