新一代大学英语教材的编写原则

随着"十一五"国家规划教材工作的开展,一轮新的教材编写高潮出现了.自1961年,大学英语教材已经走过了近半个世纪的历程,出现了不同编写理念的四代教材.尽管20世纪90年代后期出现的第四代教材已经注重语言技能的培养,但无论在教材编写目的、课文选材、原文处理上还是练习设计上,离真实性这一现代外语教材编写重要原则还有距离.随着<大学英语课程教学要求>制定了培养学生应用综合能力的教学目标,<高中英语课程标准>提出了和大学英语几乎相同的能力要求,大学英语教学的发展呼唤第五代教材.新一代教材必须体现实用性,主题化、重内容,立体化、多样化、任务型,以学生为中心等编写原则.     

回想春天的气味

又是一年春光好。春天,总能让人心生许多美好,让人朝气蓬勃,充满希望。回想春天的气味,唐敏感觉是"潮湿的,带着野蛮的青草的生涩气息"。是回忆,让春天如此美丽,不可形容吗?同样是回忆,通过窗外的春光,庐隐撩拨起童年的眷恋,对于孩子,那窗外的世界一切都是美丽的、和谐的、自由的,但愿这窗外的春光,永驻人间。     

师范院校实验室管理模式探讨

介绍了实验室管理的重要性，分析了师范院校现行实验室管理模式存在的问题，提出了几种新的管理模式。     

昨天 今天 明天

昨天，蓝天妈妈一碧如洗。娇艳的朝霞、绚烂的彩虹、调皮的星星、多变的云朵。都陶醉在她的怀抱里。     

Intersections of two offset parametric surfaces based on topology analysis

INTRODUCTIONTheOSSI(OffsetSurface/SurfaceIntersection)problemisasub-problemofgeneralSSI.AlthoughtheOSSIproblemcanberesolvedbyapplyinggeneralSSIalgorithm,itiscomputationallyexpensiveandexhaustive.Inrecentdecades,effortshavebeenfocusedoncomputingSSIexactly,efficiently,androbustlyinageneralsetting(Abdel-MalekandYeh,1997;Changetal.,1994;BurkeandSabharwal,1996;Mullenheim,1991).Thesetechniquescanbeclassifiedmainlyintofivecategories:algebraic,latticeevaluation,marching(tracing)method,…     

Distributed collaborative CAD system based on Web Service

INTRODUCTION Computer Supported Collaborative Work(CSCW) refers to technologies that use computertechnologies, multimedia technologies and networkcommunication technologies to support geogra-phically distributed users to collaborate with designtasks under shared environments. It is argued thatthe product development period may be shortenedgreatly when users independently and collabora-tively join in the designing, planning and assemblyprocess with the same product under a distributedenv…     

Investigation on apoptosis of neuronal cells induced by Amyloid beta-Protein

INTRODUCTION Senile dementia of the Alzheimer type calledin short Alzheimer’s Disease (AD), is the mostcommon type of senile dementia. The pathologicalcharacters of AD are neuron loss, accumulation of senile lipofuscin pigment (SP) caused by the ex- tracellular deposition of Amyloid beta-Protein (Aβ) and neurofibrillary tangles (NFT) caused by ac-t cumulation of excessively …     

Intersections of two offset parametric surfaces based on topology analysis

Conventional methods for solving intersections between two offset parametric surfaces often include iteratively using computationally expensive SSI (surface/surface intersections) algorithm. In addition, these methods ignore the relations between the intersection curves of parametric surfaces with different offset distances. The algorithm presented in this paper, makes full use of the topological relations between different intersection loops and calculates intersection loops with the help of previously calculated intersection loops. It first pre-processes two parametric surfaces to obtain the characteristic points, called topology transition points (TTPs), which can help in the subsequent finding of the topologies of the intersection curves. Then these points are categorized into several distinct groups, and we can determine the calculation strategy for searching initial points by analyzing the properties of these TTPs on the surfaces. Hence, all intersection curves can be marched from initial points by the tracing algorithm. The proposed algorithm could calculate intersection curves robustly and effectively, and has been tested to be capable of overcoming the degenerate conditions such as loop and singularities leaking that occur frequently in conventional algorithms. Project supported by the National Research Foundation for the Doctoral Program (No. 2000033554) of Higher Education of China and the Natural Science Foundation of Zhejiang Province, China (No. 6001107)     

彰武水库水体营养化状态及发展趋势分析

为了解安阳市供水水源地-彰武水库的水质营养化状态的变化情况,利用2006-2015年安阳市环境保护监测中心站对该库区水质的监测数据,采用综合营养状态指数法(TLI法)对其富营养化状态进行评判,并运用Daniel趋势校验法对水库富营养化状态变化趋势进行了分析研究,并提出改善水库水体质量的综合治理措施.结果表明,2006-2015年间,安阳市彰武水库综合营养状态指数在41.0~55.5之间波动变化,在中营养至轻度富营养状态区间波动,水体营养状态变化呈上升、显著变化趋势.     

危害四季豆生产的土壤根结线虫生态地理居群的研究

通过已感土壤根结线虫病的四季豆田间取样研究 ,结果表明 :危害四季豆生产的土壤根结线虫居群为南方根结线虫 (M .incognita)种 ;造成四季豆感病的直接原因是四季豆属于南方根结线虫的寄主植物