G2连续的截面数据重构

针对特征间G2连续约束条件难于满足,导致截面重构质量不理想的问题,提出了一种有效的G2连续截面数据重 构方法。文章重点研究圆弧特征与自由特征间边界约束为G2连续的截面数据重构。优先重构圆弧特征,然后基于边界Gl连续约束模型重构自由特征;插入最优节点,微调控制点满足严格C2连续约束条件。实例表明该方法能够保证截面 重构质量,缩短截面重构周期。从而解决包含圆弧与B样条曲线的截面特征重构问题。 关键词：逆向工程;截面数据重构;G2连续;特征;约束     

1959—1961中国大饥荒:成因、分布与解释

1959—1961年中国发生了现代人类史上最为惨重的饥荒,导致了人口大量非正常死亡。本文对大饥荒成因、终结和分布差异原因进行了系统回顾和评述,指出现有研究的解释力度不足,存在诸多可疑之处。在此基础之上,提出了一个能融合多个观点的解释性框架,构建了一个中央决策层、地方政府实施层和农民反馈层互动博弈圈,分析了信息流交换异常与否对饥荒蔓延、缓解和终结的影响。     

从原始文字到现代图案:象形文字的图形创意研究

从原始文字到现代图案,象形文字作为原始文字的一种对象形文字图形的运用与设计研究,一直是现代图案设计的重要研究课题。作为一种原始文字,象形文字有着独特的原始形式,因此为图形创意提供了丰富的想象空间,具有无穷的魅力。通过分析原始文字的图形语言表达和图像的文化感知,进而以古代甲骨文字、东巴象形文字和克雷特文字为例,进行象形文字图形创意的可变性研究,最后将结果运用到创意设计中,实现象形文字资源的推陈出新。     

论荀子哲学中的“听”

"听"作为荀子哲学中一个重要的概念范畴,有着丰富而深切的含义,与荀子关注的一些核心概念和问题有着密切的关联。荀子认为,当耳与声相遇,同时,"心"发挥作用时,"听"才能真正发生。并非所有的内容都需"听","听"与"不听"的标准在于,其内容是否顺乎礼义,符合广义的"道",能否"合先王"、"及后王"。听的重要性和必要性彰显在"听"的内容,产生的效果,"听"的内涵和外延,以及"听"与乐的关系等方面。要想做到真正的听,应遵循"听"的原则,守持"听"的态度,做到"兼听"与"衡听",并在这一过程中不断克服人"好听"的本性。     

Tables for computing shortest confidence intervals involving the f-distribution

Tables of multipliers necessary for computing the shortest confidence interval in situations involving the F-distribution are presented. Such situations are illustrated with several examples.     

Changing Residence: Comparative Perspectives on its Relationship to Age,Sex, and Marital Status

Change of usual dwelling unit (house, flat, etc.) during a fixed period of time is the common denominator to measuring the amount of spatial mobility within different countries. Around 1980 or 1981, the percentage of population who moved from one dwelling unit to another in one year was over 19 per cent in New Zealand, 17–18 per cent in the United States, Canada, and Australia, 9–10 per cent in Great Britain, Sweden, Japan and France, 7–8 per cent in the Netherlands and Belgium, and 6 per cent in Ireland. Evaluation of ‘age schedules’ of local and non-local movement reveals especially high mobility among U.S. children, and a narrowing of mobility differences for older people between countries, particularly over local distances. Life-table techniques help to quantify the amount of mobility associated with different marital statuses, and bring into focus some of the sequelae of these statuses for men and women in different countries.     

信息瀑布中的动物精神

信息瀑布行为已被研究者逐渐接受并作为经典金融市场理论的有力补充,但现有"一次决策"信息瀑布实验很难刻画这种信念依赖现象;赋予决策者对同一事件一次以上序贯选择机会的多决策信息瀑布实验更符合实际.结果表明:第二次决策阶段信息瀑布发生率显著提高,但决策正确率却有所下降,这为凯恩斯的"动物精神说"提供了实验证据.此外,平衡状态下位于决策序位中部的决策者系统性地背叛了自己的私人信息.     

混凝土拉压杆模型最小拉压杆夹角取值范围研究

混凝土深梁抗剪设计和应力非规则区设计一直是工程界的难题，目前普遍认为拉-压杆模型法是设计混凝土深梁和应力非规则区比较有效的方法之一，已经被多国规范所采纳。虽然各规范都认识到拉、压杆之间的夹角取值对设计和验算结果的影响，并对此做了相应的规定，但都没有明确地将腹板的配筋率，腹板钢筋的屈服强度和混凝土的极限抗压强度等因素联系起来，因此有必要对此做进一步深入的研究。通过控制腹板钢筋屈服先于混凝土压杆的破坏，防止结构发生脆性破坏为条件，推导了拉、压杆之间最小夹角与腹板的配筋率，腹板钢筋的屈服强度和混凝土的极限抗压强度等因素之间的关系表达式，得到了一些有意义的结论。     

关于我国中小学教师继续教育课程现代化的构想

课程现代化是中小学继续教师继续教育改革的核心.从目前的情况来看,我国中小学继续教育课程现代化应包括四个方面的内容,即课程内容的时代化、课程体系的科学化、课程底蕴的人文化、课程结构的多样化.     

Rejoinder

Kaplan–Meier graphs of survival and other timed events are an extremely effective way to summarize outcome data from some types of clinical studies, but information on dates and the interaction among events is lost. A new mode for presenting such data is proposed, an Eventchart, that aids in looking at the study as a whole by simultaneously displaying the timing of 2–3 different types of events, including censoring and time-dependent covariate events. The chart helps to monitor accrual and can be used to “guesstimate” the amount of information resulting from additional enrollment and/or follow-up. Eventcharts are designed to supplement, not replace, quantitative methods of analysis or conventional survival graphs. Data from bone marrow transplantation and AIDS studies are used to illustrate the method. Terminology is suggested for describing the concepts and distinguishing among the complex of events studied in modern clinical trials, including timed events, loss and date censoring, and time-braided events.