面向高空作业采摘果实机器人设计

针对果品采摘作业的复杂性以及自动化程度低的情况,提出高空采果机器人的设计和制造。机器人采用坦克式 双履带行走驱动方式,所有的原动件安在机身上,使重心下移,保持行走稳定;手臂采用硬塑料板及铝质型材支撑多段折 叠式手臂,通过底部的3个马达绕绳实现手臂的展开与收缩;手臂顶端为1个三自由度高度灵活的夹子,可以方便地采 摘果实;夹子下方一个口袋作为收集装置。应用结果表明,文章设计的机器人具有质量轻,机身小,造价低,实用性好等 优点,能满足高空采摘作业要求。     

社会学视角下女性犯罪的思考

从构建和谐社会的高度来思考女性犯罪的预防,就是通过关注女性这个弱势群体的教育状态与就业发展空间,正视女性犯罪的诱发因素,进而从提高女性自身素质与关注女性就业方面进行女性犯罪预防,以维护社会稳定,构建和谐社会.     

北流白话的介词及其用法

文章通过与现代汉语普通话介词的比较,确定了北流白话介词的数量和类型,并且比较全面地描写了北流白话的17个介词。     

现代学者旧体诗词创作与其学术之关系

在现代学术史上有一个特殊的现象,一大批有影响的现代中国学者,除了从事本专业的学术研究之外,还写有数量不等的旧体诗词。这些旧体诗词的最大特点在于“以现代学术入传统诗词”,从而使得他们的学术研究与旧体诗词创作发生了前所未有的密切联系。现代学者的学术与其旧体诗词的相互关系,大体可分为三种类型:一是“先有诗,后有学”模式,即在旧体诗中先有了某个“心理意象”,然后才逐渐展开为某个重要的学术方向;二是“先有学,后有诗”模式,即先有了某种知识结构与学理基础,才发而为充满现代学术与思想的诗篇;三是在“学”与“诗”之间“如盐入水”、融合无间,这代表着现代学者旧体诗词的最高境界。由于学术与诗的密切联系,还有“学术变,诗也变”的现象。现代学者的旧体诗词不同于一般的遗老遗少之作,在现代中国思想学术文化史研究中具有重要的价值。     

户籍类型与城乡居民医疗服务利用 ——基于Andersen模型的经验分析

本文利用中国社会科学院经济研究所2018年城乡居民入户调查数据,从户籍改革角度分析户口类型改变对城乡居民医疗服务利用的影响。研究发现:与户口类型未发生改变的城乡居民相比,户口类型发生过改变(农转非)的城乡居民门急诊服务利用的可能性更高,住院医疗服务支出水平更低。从户籍改革与参保类型交互效应看,相对于户口类型未发生过改变的居民医保参保人群,户口类型发生改变(农转非)会显著提高居民医保参保人群门急诊服务利用,同时降低其住院服务利用。进一步采用PSM方法进行稳健性检验,户籍改革对提高城乡居民门急诊服务利用,降低住院医疗服务利用的结论依然成立。此外,本文还发现,直接结算提高了城乡居民门急诊和住院的就诊概率;健康自评状况越差,门急诊和住院医疗服务利用可能性越高,门急诊医疗支出、住院医疗支出和跨省异地就医支出也越高。本文认为,相对于推行基层分级诊疗制度,以户籍改革推动农村居民自由流入医疗资源更丰富的城镇地区,改革基层卫生院制度,以及改变基层医疗服务提供激励机制,可能更有助于改善农村居民健康状况。     

网络社会问题与控制

网络社会问题是当今社会日益严重的全球性问题.网络社会问题的类型有:网络犯罪和网络黑客、网络色情、信息化污染、网络沉溺、信息垄断与两极分化等等.网络社会问题具有以下特征:全球性、高技术性、主观认定上的文化差异性、后果控制的艰难性.根据这些特征,网络社会问题的控制要诉诸技术、法律、道德和人文观念的力量.     

论早期巴文化

本文首先提出了对巴文化起源地的观点,认为巴文化的起源就是居住在巫山、巫溪境内的原大溪文化的居民.其次阐述巴文化的形成阶段,并论证它就是由峡江内的新石器时代文化发展而来.再次提出了巴文化的扩张阶段,是由峡内分别向东、向西扩张,并且提出了早期巴文化向东发展的路家河类型和向西发展的中坝子类型.最后解释了巴文化为什么会向不同方向扩张的原因.     

The laws of large numbers for Pareto-type random variables with infinite means

In this paper, we consider the laws of large numbers for NSD random variables satisfying Pareto-type distributions with infinite means. Based on the Pareto-Zipf distributions, some weak laws of large numbers for weighted sums of NSD random variables are obtained. Meanwhile, we show that a weak law for Pareto-Zipf distributions cannot be extended to a strong law. Furthermore, based on the two tailed Pareto distribution, a strong law of large numbers for weighed NSD random variables is presented. Our results extend the corresponding earlier ones.     

A comparative study of confidence intervals to assess biosimilarity from analytical data

Assessment of analytical similarity of tier 1 quality attributes is based on a set of hypotheses that tests the mean difference of reference and test products against a margin adjusted for standard deviation of the reference product. Thus, proper assessment of the biosimilarity hypothesis requires statistical tests that account for the uncertainty associated with the estimations of the mean differences and the standard deviation of the reference product. Recently, a linear reformulation of the biosimilarity hypothesis has been proposed, which facilitates development and implementation of statistical tests. These statistical tests account for the uncertainty in the estimation process of all the unknown parameters. In this paper, we survey methods for constructing confidence intervals for testing the linearized reformulation of the biosimilarity hypothesis and also compare the performance of the methods. We discuss test procedures using confidence intervals to make possible comparison among recently developed methods as well as other previously developed methods that have not been applied for demonstrating analytical similarity. A computer simulation study was conducted to compare the performance of the methods based on the ability to maintain the test size and power, as well as computational complexity. We demonstrate the methods using two example applications. At the end, we make recommendations concerning the use of the methods.     

Underlying processes of SCCT: Mediating roles of preventability,blame, and trust

Despite the prevalence of the situational crisis communication theory (SCCT; Coombs, 2007) in crisis communication research, few SCCT-based studies have examined how different crisis types affect post-crisis reputation. This study, therefore, attempts to uncover the underlying processes of SCCT. Specifically, this study examined preventability, blame, and trust as potential mediators of crisis type and organizational post-crisis reputation. A between-subjects experimental study (crisis type: victim vs. accidental vs. preventable) was conducted with 329 college students. The results revealed that crisis type had no direct effects on reputation, but it did affect preventability, blame, and trust. More significantly, the results showed that crisis type indirectly affected reputation in two distinct ways: (1) via a sequence of preventability and blame and (2) via trust. The study includes a discussion of theoretical and practical implications.