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.     

区块链背景下智能包装产业新模式

区块链具有数据防篡改、可溯源等特点,智能包装具有数据采集、信息互动等优势,区块链可以为智能包装的进一步发展与应用提供新技术,而智能包装则可以拓宽区块链的应用领域,两者的融合必将引发智能包装产业模式的新一轮变革。在深入解析区块链发展阶段、分类、特点,以及智能包装功能、作用、发展现状与问题之基础上,努力探索两者融合发展的融合点、融合路线以及融合模式,能够为智能包装产业发展提供切实的理论指导。     

论数字期刊的整合营销传播

数字期刊随着互联网的快速发展而迅速普及,对高校和科研院所的教学及研究有着十分重要的作用.由于国内外现在对传统期刊,尤其是学术期刊的经费支持力度减弱,迫使传统期刊社结合数字期刊,利用互联网市场进行营销寻找出路.以国内"中国知网"、"维普"、"万方"三家数字期刊经营企业为重点,运用整合营销传播理论,从产品、价格、渠道、促销四个方面的横向整合以及内容结构、互动服务、编辑流程三个方面的纵向整合为路径,分析数字期刊的经营举措和营销方法,从而揭示其未来发展方向.     

Research approaches to networked employment services: A systematic review

Research on networked services aimed at the (re)employment of groups marginalised from the labour market has gained momentum in different scholarly traditions (e.g., public administration, healthcare and social policy), but the topic remains somewhat fragmented. In this paper, we systematise and synthesise this research with the aim of outlining distinct research approaches, facilitating increased cross-disciplinary understandings and promoting interdisciplinary research. Based on a systematic review of the literature (1990–2018, n = 273), we highlight four dominant research approaches: rehabilitation, disability, welfare and governance. We show that these research approaches involve distinct conceptualisations of labour market inclusion, networked services and the target groups. Nevertheless, the research approaches also apply similar terms and concepts (e.g., partnership, collaboration) but with different (more or less implicit) connotations, which lead to fragmentation. We do not suggest that there be a unified use of concepts across traditions; however, we argue for the necessity of increased awareness of the similarities and differences between these research traditions in order to increase understanding of the networked employment services available to marginalised groups.     

Diversity of romantic experiences in late adolescence and their contribution to identity formation

Romance constitutes a central experience in adolescence, which can take several forms including (a) serious romance with a steady partner, (b) casual and short‐lived dating, and (c) pending experiences of romantic thoughts and attempts. Using a three‐way longitudinal design, the present study examined the gender differences and developmental changes of these romantic experiences, and their cross‐lagged associations with identity processes, throughout one year in late adolescence. 389 students (63% girls) filled out questionnaires about their romantic experiences and identity processes. Girls reported more serious romance than did boys, who reported more casual dating and pending experiences. Serious romance increased over the year for both genders whereas casual dating and pending experiences continued to rise only for boys. The cross‐lagged model highlighted that serious romantic experience positively predicted identity commitments and exploration in depth whereas identity exploration in breadth positively predicted casual dating. This pattern was stable over the three time points and across gender and age groups. Overall, this study invites consideration of more diverse romantic experiences than those associated with tangible involvement. We discuss the contribution of romantic experiences to the identity dynamic.     

Sharpest Tool in the Shed - Accounting Concepts for Managing the Collections Budget

Abstract

This segment of Sharpest Tool in the Shed provides an overview of acquisitions accounting principles and how these concepts can help acquisitions staff and budget managers monitor, track, and project the collections budget to prevent overspending or underspending. Focusing primarily on encumbrances, this article will review the basic accounting equation for library funds, identify common encumbrance problems and pitfalls, and briefly discuss the impact of library system migrations on encumbrances and fund data.     

儿童语音习得中的语音处理策略

语音处理策略是用一些简单的音替代那些与之具有共同特征但对个人发音能力构成困难的音的心理操作过程。语音处理策略是儿童发音器官运用能力低,认知能力等资源受限的一大体现。文章在回顾国内外主要相关研究的基础上,对一名汉语普通话儿童1岁8个月时使用的语音处理策略进行了系统分析,试图探讨儿童语音习得中普遍趋势、语言环境和个人偏好所起的作用,以及儿童语音习得是否受天生的音系规则支配的问题。     

Convergence of compensators of simple point processes

Processes are viewed as random variables with values in the space of càdlàg functions endowed with the J₁ topology. For a sequence of point processes with their minimal filtration, the convergence of their compensators is studied. It is shown that convergence in probability of the processes and of the corresponding conditional distributions of their jump times implies, with some additional hypothesis, the convergence in probability of the compensators. The result is then applied to convergence to a quasi-left-continuous point process with independent increments.     

A product-limit estimator for use with length-biased data

The following life-testing situation is considered. At some time in the distant past, n objects, from a population with life distribution F, were put in use; whenever an object failed, it was promptly replaced. At some time τ, long after the start of the process, a statistician starts observing the n objects in use at that time; he knows the age of each of those n objects, and observes each of them for a fixed length of time? ∞, or until failure, whichever occurs first. In the case where T is finite, some of the observations may be censored; in the case where T =∞, there is no censoring. The total life of an object in use at time ∞ is a length-biased observation from F. A nonparametric estimator of the (cumulative) hazard function is proposed, and is used to construct an estimator of F which is of the product-limit type. Strong uniform consistency results (for n → ∞) are obtained. An “Aalen-Johansen” identity, satisfied by any pair of life distributions and their (cumulative) hazard functions, is used in obtaining rate-of-convergence results.