渐开线少齿差齿轮副承载能力系数

渐开线少齿差齿轮副,由于是内啮合,齿轮副的齿对之间的间隙很小,在受力后轮齿变形而使得同时有多对齿啮合。本文用简明的几何推导,弹性力学的方法,推导出了轮齿受载弹性变形后同时啮合的确切齿对和承受载荷最大的齿对的载荷与总载荷的比例系数——承载能力系数。利用承载能力系数可算出更符合实际的各齿对分别承受的载荷。经样机的设计、制造和试验结果表明,本文提出的计算方法和公式是正确的,可以有效地提高齿轮副的承载能力。     

Emotion Regulation Strategies and Parenting Practices among Parents of Children With Clinic-Referred Conduct Problems

Objective. This study examined the cognitive-affective strategies used by parents of young children with conduct problems to regulate emotions. Key questions concerned the extent to which these emotion regulation strategies are associated with positive and negative parenting practices and predict quality of parenting through interplay with parental depression. Design. Participants were families of toddlers (n = 84) referred to a tertiary-level health service for the treatment of disruptive behavior problems. Parenting practices were indexed through observational coding of parent–child interactions and self-report data on multiple dimensions of positive and negative parenting. Parents self-reported their use of cognitive reappraisal and expressive suppression—the two emotion regulation strategies that are most robustly associated with psychosocial functioning in adults. Results. Associations between emotion regulation strategy and quality of parenting were moderated by parental depressive symptom severity, with distinct effects seen for positive and negative parenting practices. In terms of positive parenting, more frequent use of cognitive reappraisal was associated with increased use of labeled praise among parents with lower levels of depressive symptoms, whereas parents who had higher levels of depressive symptoms engaged in less such praise regardless of how frequently they used reappraisal. In terms of negative parenting, frequent use of cognitive reappraisal and expression suppression were associated with reduced levels of negative parenting, but only among parents with high levels of depression. Conclusions. These findings add to growing support for the integration of emotion regulation strategies into family process models of early-onset conduct problems and related clinical interventions.     

Child abuse potential inventory and parenting behavior: Relationships with high-risk correlates

The primary purpose of this research was to examine the construct validity of the Child Abuse Potential Inventory by comparing maltreating and high-risk parents' CAP Inventory abuse scores to their behavior during interactions with their children. A second purpose was to determine the degree to which CAP Inventory scores and parenting behavior were related to several known correlates of abuse, as measured by parent and teacher reports. Participants (n = 41) included abusive and high-risk parents and their children referred to a treatment group. Correlational analyses revealed that CAP Inventory scores and observed parenting style yielded highly related findings, supporting construct validity of the CAP Inventory. However, the CAP Inventory and observed behavior index showed a different pattern of relationships to the risk correlates. Implications for assessment of risk status are discussed and recommendations are provided for continued research.     

Dechlorination by combined electrochemical reduction and oxidation

INTRODUCTION Chlorinated phenols compounds used widely in industry were intentionally or inadvertently released into environment in large quantities. These chlorin-ated aromatic compounds have strong resistance to physical, chemical and biological treatments and have been listed as a priority pollutant by the U.S. Envi-ronmental Protection Agency (Lin and Tseng, 1999). Wastewater containing chlorophenols has malodor-ous odor, high toxicity, bioaccumulation and car-cinogenic potential. …     

基于马尔可夫模型的高校图书馆学科评价服务研究

随着"双一流"建设总体方案的提出，科研成果越来越受到重视，高校图书馆开展学科评价服务，对于提升图书馆的服务和地位具有至关重要的意义。本文在分析了吉林大学2010-2016年发表的论文总体情况的基础上，选取论文发表总量前10名的学科为研究对象，运用文献计量学方法和马尔可夫模型分析方法，与传统的评价指标相结合，构建相应的综合评价指标，消除学科间的基础差异，分析得出各个学科的发展速度和发展趋势情况。     

不同情境下老年人对健康信息源的选择差异研究

[目的/意义] 揭示老年人健康信息源选择因情境不同而存在的差异,为助力图书情报机构更好地开展面向老年人的健康信息服务提供理论依据和对策建议。[方法/过程] 参考信息源视野理论对信息源的分类,采用访谈法,分析老年人在处理健康危险状况、参与医疗决策、改变或预防不良健康行为这3种不同健康情境下获取健康信息的信息源选择差异,并结合人口学特征探究老年人在信息源选择数量上的群体间差异。[结果/结论] 研究结果表明：①3种情境下,组织信息源和人际信息源均是老年人主要使用的信息源;②随着年龄的增长,老年人对人际信息源的依赖性逐渐增加;③3种情境下老年人对网络信息源、印刷信息源的使用程度都不高;④不同文化水平和自评经济状况的老年人群在信息源选择数量上存在明显差异,其中文化水平造成的差异在3种情境中均有体现,自评经济状况造成的差异体现在参与医疗决策和处理健康危险境况两种情境中。     

基于深度学习的期刊分群与科学知识结构测度方法研究

准确地研究和测度科学知识之间的逻辑关系和结构体系,是进行科学政策研究和科研项目资助布局等科研管理活动的重要基础。学术期刊作为科学知识传播和交流的重要平台,是探测科学知识结构的一种有效载体,但是不同的学术期刊分类体系对科学知识结构的测度结构会产生直接而广泛的影响。文章从学术期刊分群的角度出发,考虑期刊在共被引过程中的距离因素,通过采用深度学习算法,来进行期刊的相似度计算与分群问题研究,在此基础上进行科学知识结构测度方法研究,并以中国人文社会科学期刊引文数据库为实验对象进行了实证研究。从实证结果来看,我国人文社会科学学科知识结构存在较为明显的结构划分,不同学科类别或不同研究领域的期刊都被分到了相应的群组,表明从期刊使用的角度来看,我国人文社会科学知识结构边界是相对较为清晰的。在此基础上重点对法学期刊的两个群组的科学研究主题进行了挖掘,从关键词的共现网络中可以明显看出,两个期刊群体内的研究主题虽有一定的交叉,但是两者在具体研究内容上也存在着显著区别。     

国外高校图书馆学术出版数字化转型路径研究

近年来,为应对学术出版数字化变革引发的学术资源垄断和用户需求变化,国外的高校图书馆已经投入到学术出版数字化活动中去,并积累了丰富的技术经验,成为了关键参与者。本文以《图书馆出版名录》为参考进行数据统计分析,分别从内容收集、内容存储、开放存取和出版平台等方面展示国外高校图书馆学术出版数字化转型路径,并提出我国高校图书馆可以从利用高校资源、谋求合作伙伴、支持开放存取、合理选择保存系统和出版平台等方面进行学术出版数字化实践。     

Focus-on-form instructional methods promote deaf college students' improvement in English grammar

Focus-on-form English teaching methods are designed to facilitate second-language learners' noticing of target language input, where "noticing" is an acquisitional prerequisite for the comprehension, processing, and eventual integration of new grammatical knowledge. While primarily designed for teaching hearing second-language learners, many focus-on-form methods lend themselves to visual presentation. This article reports the results of classroom research on the visually based implementation of focus-on-form methods with deaf college students learning English. Two of 3 groups of deaf students received focus-on-form instruction during a 10-week remedial grammar course; a third control group received grammatical instruction that did not involve focus-on-form methods. The 2 experimental groups exhibited significantly greater improvement in English grammatical knowledge relative to the control group. These results validate the efficacy of visually based focus-on-form English instruction for deaf students of English and set the stage for the continual search for innovative and effective English teaching methodologies.     

Commentary: the coalition for improving maternity services:

A consumer advocate, two childbirth educators, and a certified nurse-midwife each provide commentary on the effectiveness of and potential uses for the Evidence Basis for the Ten Steps of Mother-Friendly Care.