基于Matlab语言的有限元法及其应用

介绍了有限元法的本质特征及用变分试函数法和残值试函数法导出有限元法的过程,给出了在Matlab语言环境下实现有限元法的步骤.利用Matlab语言中的PDE工具箱求解偏微分方程具有简便、快速、可视化程度高等优点,能满足精度要求,并以一个工程实例说明了利用有限元法求解偏微分方程从而解决实际问题的方法.     

二维非稳态晶体生长问题解的稳定性

对在均匀流场作用下的二维非稳态晶体生长控制方程进行了分析,证明了原定解问题的解是稳定的.     

基于"簿记"理论的我国IPO抑价实证研究

利用我国询价发行的新股数据,从新股的价格行为特征入手,借助“簿记”理论,可研究我国累积投标询价方式发行新股的IPO抑价现象。研究结果表明:我国询价制度在收集发行前新股信息方面是有效的,但有效性受制度限制而低于国外;IPO抑价是对揭示真实信息投资者的一种价格补偿;由于数量补偿机制受限,导致IPO抑价高于国外。     

Local Linear Estimation for Time-Dependent Coefficients in Cox's Regression Models

This article develops a local partial likelihood technique to estimate the time-dependent coefficients in Cox's regression model. The basic idea is a simple extension of the local linear fitting technique used in the scatterplot smoothing. The coefficients are estimated locally based on the partial likelihood in a window around each time point. Multiple time-dependent covariates are incorporated in the local partial likelihood procedure. The procedure is useful as a diagnostic tool and can be used in uncovering time-dependencies or departure from the proportional hazards model. The programming involved in the local partial likelihood estimation is relatively simple and it can be modified with few efforts from the existing programs for the proportional hazards model. The asymptotic properties of the resulting estimator are established and compared with those from the local constant fitting. A consistent estimator of the asymptotic variance is also proposed. The approach is illustrated by a real data set from the study of gastric cancer patients and a simulation study is also presented.     

论三个环节两度否定

要对三个环节两度否定的理论取得共识，需作更深入的分析研究，从辩证法学说史和现实世界的辩证本性两个方面作系统的分析研究，可以肯定三个环节两度否定具有普适性，否定之否定规律具有普效性，同时明确这一规律在辩证法科学体系中的地位与作用。三个环节两度否定的客观真理性勿庸置疑。     

元语否定复句结构式析因

元语否定作为一种标记否定,它的标记形式一般为由本句和义句构成的复句结构式。这与否定句辖域的宽泛性、焦点确定的单一性和存在的优先解读现象密切相关。元语否定因其否定的对象一般呈非显性状态而不属于优先解读的范围,那么在否定辖域内的诸多潜在解读中就需要通过附加义句的形式特别予以明示。     

A new axiomatic foundation of partial comparability

The paper presents some results obtained in searching for a new axiomatic foundation for partial comparability (PC) in the frame of non-conventional preference modeling. The basic idea is to define an extended preference structure able to represent lack of information, uncertainty, ambiguity, multidimensional and conflicting preferences, using formal logic as the basic formalism.A four-valued paraconsistent logic is therefore described in the paper as a more suitable language for the purposes of the research. The concepts of partition, general binary relations properties, fundamental relational system of preferences (f.r.s.p.), maximal f.r.s.p. and well founded f.r.s.p. are then introduced and some theorems are demonstrated in order to provide the axiomatic foundation of PC. The main result obtained is a preference structure that is a maximal well founded f.r.s.p. This preference structure facilitates a more flexible, reliable and robust preference modeling. Moreover it can be viewed as a generalization of the conventional approach, so that all the results obtained until now can be used under it.Two examples are provided at the end of the paper in order to give an account of the operational potentialities of the new theory, mainly in the area of multicriteria decision aid and social choice theory. Further research directions conclude the paper.This research has been done while the first author was in the Université Libre de Bruxelles under the Research in Brussels actions.     

Object relations theory: Cultural and social implications for psychotherapy with individuals who are deaf

The case of Rita highlights the importance of integrating a multicultural perspective with psychodynamic theory for individuals who are deaf or hard of hearing. Social constructivist theory suggests that the meaning and stigma of deafness influences the parent‐child relationship as well as the numerous socialization experiences that an individual encounters. As this paper shows, the Deaf community, with its unique linguistic, cultural, and social processes, played an integral role in developing whole object relations for Rita. This case exemplifies the importance of integrating psychological, sociocultural, and linguistic components, which are essential to the development of those who are deaf.     

A general result in almost sure central limit theory for random fields

In this note, we investigate, under some mild conditions, the almost sure central limit theorem for random fields with general weight sequences.     

Inference for Parameters Defined by Moment Inequalities: A Recommended Moment Selection Procedure

This paper is concerned with tests and confidence intervals for parameters that are not necessarily point identified and are defined by moment inequalities. In the literature, different test statistics, critical‐value methods, and implementation methods (i.e., the asymptotic distribution versus the bootstrap) have been proposed. In this paper, we compare these methods. We provide a recommended test statistic, moment selection critical value, and implementation method. We provide data‐dependent procedures for choosing the key moment selection tuning parameter κ and a size‐correction factor η.