试论设计素描的艺术特性及与传统绘画素描的差异

怎样使学生从传统的绘画素描到具有创新的设计素描的过渡,分析两者之间的差异性是十分必要的。有效区分二者的差别和具体内涵,了解设计素描独特的艺术特性,从而能促进基础素描教学改革的发展。     

The Relationships of Perceived Health Professionals’ Communication Traits and Credibility with Perceived Patient Confidentiality

Patients at a large medical clinic provided data permitting an analysis of the relationships of perceived communication behaviors (nonverbal immediacy, assertiveness, and responsiveness) and source credibility (competence and caring) with perceptions of the confidentiality of their medical records. Perceptions of physicians, nurses, and support staff were employed. The results indicate that patients’ perceptions of the communication behaviors and credibility of physicians, nurses, and support staff are meaningfully related to patients’ perceptions of confidentiality. The problems of actual confidentiality and perceived confidentiality are discussed in relation to the role of communication as part of the problem and a potential part of the solution.     

Simulation of biatrial conduction via different pathways during sinus rhythm with a detailed human atrial model

In order to better understand biatrial conduction, investigate various conduction pathways, and compare the differences between isotropic and anisotropic conductions in human atria, we present a simulation study of biatrial conduction with known/assumed conduction pathways using a recently developed human atrial model. In addition to known pathways: (1) Bachmann’s bundle (BB), (2) limbus of fossa ovalis (LFO), and (3) coronary sinus (CS), we also hypothesize that there exist two fast conduction bundles that connect the crista terminalis (CT), LFO, and CS. Our simulation demonstrates that use of these fast conduction bundles results in a conduction pattern consistent with experimental data. The comparison of isotropic and anisotropoic conductions in the BB case showed that the atrial working muscles had small effect on conduction time and conduction speed, although the conductivities assigned in anisotropic conduction were two to four times higher than the isotropic conduction. In conclusion, we suggest that the hypothesized intercaval bundles play a significant role in the biatrial conduction and that myofiber orientation has larger effects on the conduction system than the atrial working muscles. This study presents readers with new insights into human atrial conduction.     

基于高考的学校增值评价研究

为探索既具科学性又具可操作性的学校评价方法,本研究选取某省544所中学2006年至2010年高考成绩,采用多层线性模型（HLM）,对单一学校、某一区域学校的效能增值情况进行评价,并对不同学校群体之间的效能增值差异进行比较。研究结果表明,同一学校在学科、总分及不同年度的增值表现不同;同一区域的学校在学科、总分及不同年度的增值表现也不同;不同类型学校：之间在效能增值上存在差异。     

基于XML Schema的数据建模应用研究

数据交换是XML最重要的用途之一,只有XML文档的格式/结构得到交互各方的一致认可,这个目标才有可能实现。DTD/XML Schema被用来定义XML文档的结构,描述XML文件所能包含的内容的类型。通过对XML文档的结构进行定义,应用程序能够在执行任何计算和转换之前对文档进行验证,从而保证文档格式的有效性,以利于数据的传输和交换。本文首先介绍XML数据模式语言,然后以某高校研究生招生管理系统为例,使用XML Schema对研究生招生专业目录进行数据建模。     

结构方程模型(SEM)的原理及操作

结构方程模型(SEM)是应用线性方程系统表示观测变量与潜在变量之间及潜在变量之间关系的一种统计方法。当前，SEM及相应的LISREL软件已成为心理学等社会学科中广泛应用的一种分析思想和技术。文章简要介绍了SEM的特点、原理及LISREL的操作方法。     

融入三维建模的工程图学教学改革与实践

将三维建模引入工程图学教学中是当今图学教育的一个热点。本文介绍了作者在这方面教学改革试点的情况。     

Combinatorial model of solute transport in porous media

Modeling of solute transport is a key issue in the area of soil physics and hydrogeology. The most common approach (the convection-dispersion equation) considers an average convection flow rate and Fickian-like dispersion. Here,we propose a solute transport model in porous media of continuously expanding scale, according to the combinatorics principle. The model supposed actual porous media as a combinative body of many basic segments. First, we studied the solute transport process in each basic segment body, and then deduced the distribution of pore velocity in each basic segment body by difference approximation, finally assembled the solute transport process of each basic segment body into one of the combinative body. The simulation result coincided with the solute transport process observed in test. The model provides useful insight into the solute transport process of the non-Fickian dispersion in continuously expanding scale.     

高精度伺服系统Stick-Slip摩擦的机理建模与非线性动力学分析

低速摩擦问题是高精度伺服系统设计所面临的难点之一,直接影响系统的稳态精度和稳定性,不仅会使系统产生稳态误差,而且还会导致Stick-Slip运动,甚至会使系统进入混沌状态.为了能提高系统性能,很多学者对含摩擦环节的伺服系统进行了大量研究,得出了很多有益的结论.本文主要综述近年来在摩擦特性和机理研究、摩擦建模以及摩擦非线性动力学三个方面的研究现状,并对今后的研究方向进行了分析.     

Using Harvesting Models to Teach Modeling with Differential Equations

Abstract: Harvesting models based on ordinary differential equations are commonly used in the fishery industry and wildlife management to model the evolution of a population depleted by harvest mortality. We present a project consisting of a series of scenarios based on fishery harvesting models to teach the application of theoretical concepts learned in a differential equations course to scenarios encountered in real fisheries. These projects require a thorough understanding of simplifying assumptions inherent in various models, as well as a qualitative analysis of phase portraits, bifurcations, and stability of steady states. Parameters are estimated and equations are sometimes solved both analytically and numerically. Students learn to respond to a professional request from a fishery in the form of a scientific report, which requires organizing and communicating assumptions, models, solution methods, results, and a final recommendation with clarity and professionalism.