Rational offset approximation of rational Bézier curves

INTRODUCTION Offset curves/surfaces, also called parallel curves/surfaces, are defined as the locus of the points which are at constant distance along the normal from the generator curves/surfaces. As for a planar gen- erator curve Γ:C(t)=(x(t),y(t)), the parametric speed and its norm σ(t) are defined respectively as (Farouki, 1992) C ′( t ) =( x ′( t ), y ′(t )),σ (t ) = x ′ 2 (t ) y ′2(t ). (1) Subsequently the offset curve of the generator curve, which is at constant distanc…     

The Historical Perspective on the Relationship between the Government and Higher Educational Institutes and Its Legal Foundation

This article tentatively has a research on the history of the relationship between the government and the higher educational institutes and its legal foundation since China＇s Reform and Opening. It also puts forward the best principles of the relationship between the government and the higher educational institutes at the present stage.     

Promoter trapping in Magnaporthe grisea

INTRODUCTION Magnaporthe grisea is a filamentous ascomy- cete that parasitizes economically important crops, such as barley, wheat, and rice (Talbot, 2003). It is also a good experimental model for studying fungal pathogenesis by both classical and molecular genetics (Dean, 1997). In recent years, many techniques have been developed to identify functional genes in M. grisea (Kamakura et al., 1999; Rauyaree et al., 2001; Takano et al., 2003; Irie et al., 2003; Lu et al., 2005). Of these…     

韩国出版业现状

韩国出版业现状中国出版科学研究所魏玉山，赵丛一、目前出版业的基本状况１．出版社的统计与分析据韩国文化体育部的统计，到１９９５年底共有出版社１１５７１家，比１９９４年多了１２４６家，其增长率为１２．１％。从１９８７年实行出版社登记制以来，在这８年内新登...     

晚报版切入市场的最佳点

城市中的日报设立晚报版,是日报走向市场、参与报业竞争的一块"试验田"。那么,其切入市场的最佳点在哪里呢?根据传统的晚报观念,重社会新闻,追求可读性似为正途。然纵观当今社会心态以及报业竞争发展的趋势,由于传媒众多,可读可视之信息令人应接不暇,而现代生活节奏日快,可读性已远不足以吸引读者,故一些先觉媒体已经提出"变可读性为要读性",而使读者"要读",其中信息必须与其工作生活息息相关;同时,社会新闻受众分散.层次不一,找不准固定的消费群体,商家做广告难     

留学生心理健康问题的关注与疏导

随着我国经济社会的快速发展,更多的国际学生选择来华读书。留学生来华学习由于自身适应能力、社会支持系统、教师和当地居民的态度、教育方式不同等因素不可避免地经历跨文化心理适应阶段,影响其在华学习生活。留学生辅导员应关注留学生的心理健康问题,帮助留学生顺利度过跨文化心理适应阶段。