基于关键词分析我国图书馆焦虑研究态势

国内关于图书馆焦虑的研究已经开展多年，并取得一定的研究成果。以我国图书馆焦虑的研究文献的关键词为统计对象，基于共词分析，利用聚类方法和战略坐标图分析我国在该领域的研究现状。结果表明，目前该领域的研究集中于读者自身、图书馆环境和图书馆员三大因素的研究，从理论上研究图书馆焦虑起因的关注度在降低，图书馆焦虑缓解措施的可行性和有效性研究比较缺乏。最后给出了该领域在下一步研究中的可能方向，供研究人员参考。     

基于鱼刺图分析法的研究生导师师德师风建设研究 ——以河北工程大学为例

通过对国务院、教育部、河北省和河北工程大学出台的研究生导师立德树人与师德师风建设的系列规章制度进行研读、分析,梳理出研究生导师立德树人行为与师德师风建设的核心要素主要包括十六个维度;引入鱼刺分析图作为分析工具,将研究生导师立德树人与师德师风建设相应的十六个维度核心因素归纳整理为四大类、二十个小类因素,绘制成研究生导师立德树人与师德师风建设影响因素鱼刺分析图,给出了研究生导师立德树人与师德师风建设的影响因素一览表;结合河北工程大学实际,以研究生导师立德树人行为与师德师风建设影响因素鱼刺分析图为分析脉络,经过实地调查、走访,总结了该校研究生导师师德师风与立德树人建设所取得的成绩,发现了该校研究生导师师德师风与立德树人建设所存在问题;提出了优化研究生导师师德师风的实现路径和对策。     

基于DYNAFORM的轿车后背门冲压成形的仿真模拟

文章根据该外覆盖件特点运用CAE软件DYNAFORM进行精模拟,制定关键技术设计的方案,在此基础上,通过拉延筋的综合优化（拉延筋圆角半径和拉延筋筋高等）,达到制件无拉裂、少起皱、小回弹,保证冲压件质量,对实际生产起指导作用.较采用传统的“试错法”设计模具可以降低研发成本,从而增强企业在市场中的竞争力.     

Understanding Community Resilience from a PRA Perspective Using Binary Decision Diagrams

Probabilistic risk assessment (PRA) is a useful tool to assess complex interconnected systems. This article leverages the capabilities of PRA tools developed for industrial and nuclear risk analysis in community resilience evaluations by modeling the food security of a community in terms of its built environment as an integrated system. To this end, we model the performance of Gilroy, CA, a moderate‐size town, with regard to disruptions in its food supply caused by a severe earthquake. The food retailers of Gilroy, along with the electrical power network, water network elements, and bridges are considered as components of a system. Fault and event trees are constructed to model the requirements for continuous food supply to community residents and are analyzed efficiently using binary decision diagrams (BDDs). The study also identifies shortcomings in approximate classical system analysis methods in assessing community resilience. Importance factors are utilized to rank the importance of various factors to the overall risk of food insecurity. Finally, the study considers the impact of various sources of uncertainties in the hazard modeling and performance of infrastructure on food security measures. The methodology can be applicable for any existing critical infrastructure system and has potential extensions to other hazards.     

Why Frequency is Not Well Defined for Engineering Systems with Nonexponential Failure Times

Dr. Yellman proposes to define frequency as “a time‐rate of events of a specified type over a particular time interval.” We review why no definition of frequency, including this one, can satisfy both of two conditions: (1) the definition should agree with the ordinary meaning of frequency, such as that less frequent events are less likely to occur than more frequent events, over any particular time interval for which the frequencies of both are defined; and (2) the definition should be applicable not only to exponentially distributed times between (or until) events, but also to some nonexponential (e.g., uniformly distributed) times. We make the simple point that no definition can satisfy (1) and (2) by showing that any definition that determines which of any two uniformly distributed times has the higher “frequency” (or that determines that they have the same “frequency,” if neither is higher) must assign a higher frequency number to the distribution with the lower probability of occurrence over some time intervals. Dr. Yellman's proposed phrase, “time‐rate of events … over a particular time interval” is profoundly ambiguous in such cases, as the instantaneous failure rates vary over an infinitely wide range (e.g., from one to infinity), making it unclear which value is denoted by the phrase “time‐rate of events.”     

The generalized two-sided power distribution

The generalized standard two-sided power (GTSP) distribution was mentioned only in passing by Kotz and van Dorp Beyond Beta, Other Continuous Families of Distributions with Bounded Support and Applications, World Scientific Press, Singapore, 2004. In this paper, we shall further investigate this three-parameter distribution by presenting some novel properties and use its more general form to contrast the chronology of developments of various authors on the two-parameter TSP distribution since its initial introduction. GTSP distributions allow for J-shaped forms of its pdf, whereas TSP distributions are limited to U-shaped and unimodal forms. Hence, GTSP distributions possess the same three distributional shapes as the classical beta distributions. A novel method and algorithm for the indirect elicitation of the two-power parameters of the GTSP distribution is developed. We present a Project Evaluation Review Technique example that utilizes this algorithm and demonstrates the benefit of separate powers for the two branches of activity GTSP distributions for project completion time uncertainty estimation.     

空间格义背后的举意与旁观——《日用家当》中“家宅”的心理几何图解

在爱丽丝·沃克的短篇小说《日用家当》中,家宅被赋予了一定的格义属性,这可以被视为19世纪女性主义文学批评语境中的心理现象学介入。家宅格义背后的心理图解划清了个体＂生存空间＂的原型与流变,洋溢着深切的心理几何假设内涵。作者借助不同人物对于家宅的写实性解读,提供了一个富有曲面内涵的边缘记忆空间,揭示了主体的物我元一思想已然深植于家宅意象当中,并以拓扑图腾的同胚形式得以彰显。家宅的心理几何图解立体地刻画了个体在生存空间日渐缩限时的困顿与挣扎,更是直指个体守护本我世界时的一种精神重估,而这正是该部文学作品所隐含的原生代性旨归所在。     

T型非线性电阻网络功率转移图的图解法

本文论述了利用非线性电阻的伏安特性，作出T型非线性电阻网络中任一元件的功率转移图的图解法．     

Acute Middle Ear Infection in Small Children: A Bayesian Analysis Using Multiple Time Scales

The study is based on a sample of 965 children living in Oulu region (Finland), who were monitored for acute middle ear infections from birth to the age of two years. We introduce a nonparametrically defined intensity model for ear infections, which involves both fixed and time dependent covariates, such as calendar time, current age, length of breast-feeding time until present, or current type of day care. Unmeasured heterogeneity, which manifests itself in frequent infections in some children and rare in others and which cannot be explained in terms of the known covariates, is modelled by using individual frailty parameters. A Bayesian approach is proposed to solve the inferential problem. The numerical work is carried out by Monte Carlo integration (Metropolis-Hastings algorithm).