一种基于Web挖掘的远程教学系统的研究与实现

通过Web 日志挖掘与内容挖掘的有机结合,给出了一种个性化远程教学系统的模型,通过分析学生的兴趣给出相应的导航推荐,为学生提供个性化的教学服务,使得整个教学活动成为丰富有机的整体.     

2种保存方法对五唇兰基因组DNA提取质量的影响

采用改良CTAB法研究经硅胶干燥法和保鲜法保存的五唇兰叶片DNA降解规律,并比较两种保存方法叶片DNA的保存时间,为叶片的野外远距离采集提供指导。结果显示,采取硅胶干燥法进行保存的五唇兰叶片DNA和SOD以及POD的含量下降迅速,第1天DNA的产率已经下降到65.4 ng/g,ISSR引物可以检测出7条清晰的条带,第2天DNA则降解完全,SOD和POD含量2 d内快速较少,第2天分别降到68%和27%;采取叶片保鲜法保存的五唇兰叶片DNA一周内保存完好,产率较高,为71 ng/g左右,ISSR引物可以检测出7条清晰的条带,7 d之后DNA开始降解,ISSR引物扩增出的条带变得模糊,随着叶片衰老进程的加剧以及叶片开始出现腐烂等性状,DNA降解逐渐加速,第13天降解完全,SOD和POD含量的变化呈现出与DNA产率一致的趋势,先上升后下降,在第9天达到峰值。叶片DNA的降解规律和衰老规律呈现出一致性,离体五唇兰叶片DNA降解主要原因来自于叶片衰老的加剧以及期间产生的有毒物质的积累,野外远距离采集五唇兰叶片可采用保鲜法保存以防止DNA的快速降解。     

高等植物体内铁运输机制研究进展

铁是植物所必需的微量矿质元素,在光合作用、呼吸作用等过程中发挥着重要的作用。虽然铁在地壳中含量丰富,但生物有效获取率非常低。因此,探索高等植物铁吸收及运输机制一直是植物铁营养领域研究的热点问题。近几年来,人们对于高等植物体内铁运输,尤其是细胞内铁运输又有了新的认识。本文主要对高等植物体内长距离铁运输（木质部,韧皮部）和细胞内的铁运输（液泡,叶绿体和线粒体）两方面的运输机制进行了综述,这将帮助我们进一步了解植物铁代谢机制,对我们培育高铁含量作物和提高植物抗逆性有着重要意义。     

长跑锻炼促进大学生体质的研究

根据近年来国内外有关跑步增强体力的报道，结合甘肃农业大学的实际情况，运用长跑提高有氧代谢功能的有效运动方式，对长跑促进大学生体质的作用进行了研究。     

基于T-S模糊神经网络预测算法的管道泄漏定位研究与分析

长输管道的泄漏检测和定位对管道安全平稳运行意义极其重大,在以软件计算为主的检测方法里,模糊神经网络模型综合了模糊算法和神经网络模型的优点,能较好地适应长输管道的非线性特征。本文采用中亚地区某管道某相邻两站场的历史数据训练基于高木-关野（Takagi-Sugeno）模糊神经网络的预测模型,使用STONER管道仿真软件产生实时数据,用一种较简单的软方法较好的实现管道泄漏定位,该种方法对中亚某长输管道这类没有专门硬件泄漏检测设备和系统的管线有一定的实用意义。     

新时期高校图书馆为教学科研工作提供服务的新趋势

指出为了发展高等教育,新时期高校图书馆在教学、科研上的服务方向应重点放在学科建设、跟踪服务、研究生培养及创新教育几个方面,并提出如何发挥高校图书馆的潜能和做好教学科研服务工作的途径.     

Migration of diamondback moth,Plutella xylostella,across the Bohai Sea in northern China

The diamondback moth, Plutella xylostella (L.), is one of the most destructive pest species of cruciferous vegetables worldwide. Previous studies on the migration of P. xylostella in China were mostly carried out in its ‘year-round breeding region’ (YBR) or ‘winter diapause region’ (WDR). However, the pattern of monthly movements in its ‘summer breeding region’ (SBR) (i.e. northern China, where they cannot overwinter) remains unknown. Here we present data from an 11-year study of P. xylostella made by searchlight trapping on Beihuang (BH) Island in the center of the Bohai Strait, which provides direct evidence that P. xylostella moths must have been migrants, and undertook regular long-distance migration across the sea. There was considerable annual and monthly variation in the number of P. xylostella trapped on BH, with the vast majority was trapped in the summer. The mean time from the earliest trapping to the latest trapping within a year was 117 ± 19 d in the five mass-migration years, with the shortest time span of 51 d in 2005 and the longest of 157 d in 2010. Some females trapped in May and June showed a relatively higher proportion of having mated and a degree of ovarian development suggesting that the migration of this species is not completely bound by the ‘oogenesis-flight syndrome’. These findings provide a good starting point of research on P. xylostella migration between its WDR (or YBR) and SBR, which will help us develop more effective regional management strategies against this pest.     

智能电力监控系统远程数据传输的方案设计

介绍一种单片机控制实现远程数据传递的通讯方案,该通信使用单片机资源较少,只使用3根线(RD,TD,GND)就可以进行控制,特别适合于智能仪表的远程监控。同时还介绍了为保证数据传送正确而提供的类XMODEM协议。在电力监控系统应用该方案表明,其实现简单、可靠。     

斑点叉尾鮰鱼苗长途运输试验初报

2012年6月进行了斑点叉尾鮰(Ietalurus punetaus)鱼苗乌仔、夏花的运输试验,鱼苗装运使用常规运输鱼苗塑料袋(70cm×40cm),外包装分别采用普通纸箱包装和泡沫箱包装,运输方式为汽车和飞机空运相结合,装运密度分别为8000尾/箱和3000尾/箱,12h内运输成活均达到92%以上,证明使用塑料袋长途运输鮰鱼苗是可行的。     

Insights into the management of sea turtle internesting area through satellite telemetry

Female sea turtles typically lay several clutches during each nesting season and rest in the time between laying clutches (the internesting period) in the waters off the nesting beach. Adequate protection of turtles in the internesting area requires knowledge on their spatial behaviour and was so far hampered by methodological limitations. Satellite telemetry data of exceptionally high quality allowed us to scrutinize internesting area use of four loggerhead sea turtles nesting in the Bay of Laganas (Zakynthos, Greece). We assessed the efficacy of two zones of a marine reserve with distinct levels of protection (boats are excluded from one zone). Most of the obtained locations of three of the four turtles were within the bay, a result consistent with a strategy to minimize energy expenditure. Turtles showed no obvious preference for the highly protected area of the bay. The availability of warmer water in the less protected area may be more crucial than avoidance of boat disturbance.