An efficient method for tracing planar implicit curves

INTRODUCTION Tracing a planar implicit curve f(x, y)=0 on a rectangular region [xl, xr]×[yb, yt] is of great interest in Computer-Aided Design and Computer Graphics. While parametric curves are easy to plot, plotting implicit curves is a challenging problem. Planar im- plicit curve plotting method can be classified into two categories (Shou et al., 2005; Martin et al., 2002; Lopes et al., 2002). In the first category are subdivi- sion methods (Shou et al., 2005; Martin et al., 2002) …     

浅谈土钉墙的内部整体稳定性

本文对《建筑基坑支护技术规程》(JGJ120-99)和《基坑土钉支护技术规程》(CECS96:97)中有关土钉支护设计的计算方法,从土钉墙的内部整体稳定性分析这一个方面进行分析和比较,并给出了这两种规程的相对安全水平。     

La Maîtrise Intuitive des Relations entre Masse,Volume et Masse Volumique Chez des Elèves du Premier Cycle

Three experiments have been devoted to the application of the methodology developped by Anderson, N. H. (1981, 1982) in the framework of the Information Integration Theory to the problem of the mastery by children (14 old) of the relations between the notions of mass, volume and volumic mass. It appears that, having to judge of the mass values of diverses objects from given values of volume and volumic mass, a majority of pupils are able to take account of the positive link between the mass on the one part and the volume and the volumic mass on the other part but apply an additive type integration rule. However, a minority of pupils are able to apply a normatively correct multiplicative rule. Concerning the judgements of volume values from given mass and volumic mass values, and the judgements of volumic mass values from given mass and volume values, a majority of pupils apply a soustractive integration rule. In these two cases however the integration patterns are extremely variegated. The relation between the algebraic level of analysis of the judgement data and an information processing level of analysis of the same data is discussed. The use by teachers of the paradigm presented in the study with the aim of improving upon the current evaluation methods is proposed.     

习近平青年工作思想对高校辅导员专业化的指导价值

党的十八大以来,习近平总书记围绕青年和青年工作的重大理论和实践问题,进行了全面系统的战略谋划和决策部署,为做好新时代青年工作提供了价值导向、理论指引和方法路径。高校辅导员应遵循高校思想政治工作革新,把握贯彻习近平青年工作思想,顺应青年工作的"事""时""势",从增强职业认同、理顺职业角色、提升职业素养、提高职业能力和提高思政工作亲和力等方面,提升高校思想政治工作育人成效。     

Conditioned inhibition in feature negative discrimination learning with pigeons

Discrimination performance was investigated with pigeons using feature negative (FN) discrimination procedures which differed in the temporal arrangement of the stimuli on S? trials. In both procedures, a single common element was presented on reinforced (S+) trials. In thesimultaneous FN procedure, a distinguishing element was presented simultaneously with the common element of S? trials. In thesequential FN procedure, the distinguishing element preceded onset of the common element on S? trials. In two experiments, the sequential FN procedure yielded better discrimination performance. In Experiment 1, a summation test designed to separate learning and performance variables indicated that sequential FN subjects had learned the negative relationship between the distinguishing element and reinforcement while simultaneous FN subjects had not. In Experiment 2, summation and acquisition tests indicated that the distinguishing element developed inhibitory properties in the sequential FN procedure but not in the simultaneous FN procedure.     

浅议现代企业财务主管的角色转变

本文分析了随着现代企业制度的发展,财务主管在现代企业制度发展过程中角色的重要性以及其内涵的发展变化。     

反思五个方面 落实“三个代表”—在学校落实“三个代表”的一点想法

党中央提出,用两年左右的时间在乡镇一级开展"三个代表"的学习教育活动,如果学校--最基层的教育实体能借此东风,自觉认真地进行反思,解决好多年来沉积下来的种种问题,将是一个难得的机会.学校如何落实"三个代表"的重要思想,笔者认为,领导带头,进行如下五个方面的反思,是极为重要的.     

农村义务教育均衡发展需要充分发挥政府调控职能

促进农村义务教育均衡发展是政府的法定义务，各级政府应依法履行义务，明确自己的责任，建立严格的财政转移支付制度，完善农村义务教育经费的投入体制，发挥政府的调控职能，多渠道筹措教育经费，加强边远农村中小学建设，改革农村中小学人事和工资制度，保障农村基础教育均衡发展。只有真正解决了农村教育的经费投入和师资队伍建设问题．农村教育才可能步入均衡发展的轨道。     

转变教育思想深化实验教学改革

实验教学是全面实现人才培养目标的一个重要环节,必须转变教育思想,改革实验教学体系、实验教学方法,发挥实验室三大功能(教学、科研、社会服务),以利于培养创新型人才。