原水浮游生物调查及藻类水华的防治

目前一些大型水库相继出现藻类水华,对饮用水安全构成了威胁．通过对北方几座大型水库水体的浮游生物进行调查,提出了水华的防治措施：加强水源防护、进行深度处理、挖底泥、人工或机械捞取、采用化学方法、修复污染水体等．     

云系统垂直分层布隆过滤漂移数据删除技术

云系统中的漂移数据作为大量冗余数据的一种,对其有效及时的删除能保证云存储系统的稳定与运行。传统的云系统漂移数据删除技术采用全文件静态分块策略,由于操作粒度较小,对漂移数据的删除率不高。提出一种基于垂直分层布隆过滤的云系统漂移数据删除算法,设计基于客户端/服务器的云存储系统漂移数据删除机制体系构架,采用布隆过滤技术进行数据源端处理,引入热度垂直索引热度来衡量数据块边界偏移所造成用户的访问集中热点损失,文件根据内容划分成可变长度的数据块,进行垂直分层,得到备份集中数据对象的粒度,采用奇异值分解的方式对漂移数据序列的细节信号展示,根据矩阵奇异值分解矢量的唯一性,避免一些数据块边界偏移造成的误删和漏删。仿真实验表明采用该算法进行云系统的漂移数据删除,性能较好,执行效率和精度优越于传统算法。     

既有复线增建涵洞工字钢扣轨施工技术

株六复线贵阳枢纽C标增建二线线下工程,在既有路基处增建新建涵洞(采用明挖施工),设计要求采用P43钢轨加固线路,行车速度不能大于15km,但实际上路基处于曲线半径R=500及坡比是i=1.2%上坡地段,行车速度不低于45km,故采用P36工字钢取代P43钢轨做纵梁,进行扣轨加固施工。     

对《八月桂花遍地开》的考证

《八月桂花遍地开》这首著名的革命歌曲产生于何时？词作者是谁？至今说法不一。文章经过周密的考证后认为,其产生的时间为1929年9月,河南省商城县南乡地区（今安徽省金寨县境内）建立苏维埃政权之时,而不是在1929年12月25日红32师攻占商城县城以后;其词作者为商城县南乡斑竹园地区佛堂坳小学教师共产党员罗银卿,而不是商城县城里的王霁初。     

基于集合卡尔曼滤波的太湖叶绿素a浓度同化试验系统设计及实现

以太湖作为研究区,把数据同化技术引入蓝藻水华预测研究,设计并实现了太湖叶绿素a质量浓度同化试验系统,该系统结合基于WASP原理的二维水动力水质耦合模型,采用集合卡尔曼滤波方法同化空间分辨率为250 m的MODIS叶绿素a质量浓度反演数据. 结果表明,利用同化技术将衡量模型预报值、分析值和观测值之间的偏差指标RMSE减小了15.5%,可以有效地提高叶绿素a质量浓度的预测精度.     

南方湖库初春“水华”现象原因分析与对策

根据2004年3月海南省万泉河上游牛路岭水库“水华”事件调查监测结果，对此次“水华”现象发生原因进行了初步分析，并相应提出了防止“水华”现象再次发生的预防控制对策，对南方湖库初春“水华”现象控制有一定的借鉴作用．     

Mastering cognitive development theory in computer science education

To design an effective computer science curriculum, educators require a systematic method of classifying the difficulty level of learning activities and assessment tasks. This is important for curriculum design and implementation and for communication between educators. Different educators must be able to use the method consistently, so that classified activities and assessments are comparable across the subjects of a degree, and, ideally, comparable across institutions. One widespread approach to supporting this is to write learning objects in terms of Bloom’s Taxonomy. This, or other such classifications, is likely to be more effective if educators can use them consistently, in the way experts would use them. To this end, we present the design and evaluation of our online interactive web-based tutorial system, which can be configured and used to offer training in different classification schemes. We report on results from three evaluations. First, 17 computer science educators complete a tutorial on using Bloom’s Taxonomy to classify programming examination questions. Second, 20 computer science educators complete a Neo-Piagetian tutorial. Third evaluation was a comparison of inter-rater reliability scores of computer science educators classifying programming questions using Bloom’s Taxonomy, before and after taking our tutorial. Based on the results from these evaluations, we discuss the effectiveness of our tutorial system design for teaching computer science educators how to systematically and consistently classify programming examination questions. We also discuss the suitability of Bloom’s Taxonomy and Neo-Piagetian theory for achieving this goal. The Bloom’s and Neo-Piagetian tutorials are made available as a community resource. The contributions of this paper are the following: the tutorial system for learning classification schemes for the purpose of coding the difficulty of computing learning materials; its evaluation; new insights into the consistency that computing educators can achieve using Bloom; and first insights into the use of Neo-Piagetian theory by a group of classifiers.     

解读“日出江花红胜火”

文章由朱光潜对"日出江花红胜火"中"江花"的解读入手,分析了"江花"的颜色、内涵,提出了自己的观点:"江花"既指江边的鲜花,也指浪花。     

汉江发生"水华"的水文因素

对汉江中下游水体近年出现“水华”现象进行了回顾,并作了较全面的统计和比较分析,得出汉江水10文条件的变化是其发生的主要因素之一,最后从水文角度提出了汉江发生“水华”的预警水位及流量。     

田力宝微生物肥料对几种花卉生长和开花的影响

土壤施入较小量 (株施 5 0g以下 )固体威马牌田力宝微生物肥 (TLB)的大花美人蕉 (Cannageneralis)和白兰花 (Micheliaalba)的植株比通常施复合肥的矮 ,但施入量较大时反而高于施复合肥 ;施TLB对菊花 (Dendranthemamorifolium)的株高无明显影响。施TLB肥能使大花美人蕉的叶片数增多 ,并使菊花的叶片增大 ;施高浓度 (40 %～ 70 % )的TLB水肥不仅明显促进三色堇 (Violatricolorvar hortensis)的叶片增大 ,而且能使叶片的叶绿素含量增加。施TLB不仅可使大花美人蕉提前一周开花 ,还能使其开花总量增多 ;施TLB使白兰花幼株的开花比率提高和花量增加 ,但对花的大小无影响 ;施TLB对菊花和三色堇的开花无明显的效应。