研究生奖助学金评定方法的研究与系统实现

针对研究生奖助学金评定方法存在着一定不科学和不规范的缺陷,提出了奖助学金评定的改进方法,该方法取全部学生的平均成绩作为基准平均分,利用课程平均分与基准平均分的比例关系,把学生的实际成绩换算为同一标准下的换算成绩,再求出学生单学分下平均成绩,加上学生其它相关成绩,则可得到研究生奖助学金评定的综合成绩。系统结合学校研究生管理需求,以数据库为基础,VC为编程语言环境,实现了基于C/S架构的研究生奖助学金评定系统。实践证明,该方法公平、合理、科学,可更有效地发挥奖助学金作用。系统稳定、可靠,可大幅度提升评定的工作效率。     

国土资源涉密计算机泄密隐患分析与防范——以费县国土资源局为例

依据信息安全等级保护有关政策和标准,结合费县国土资源局信息化建设中涉密计算机管理工作实际,探讨如何从计算机信息输入和输出2个方面有效预防计算机失窃密。从计算机身份认证与访问控制、网口、UBS口电磁辐射,办公设备5个方面分析泄密隐患,并提出相应的应对措施,强调了在国土资源系统涉密计算机管理方面要加强保密意识,提高防范技能。     

泰安市岩盐资源开发利用与保护工作探析

随着岩盐资源开发强度逐年加大,开发利用保护任务日渐繁重,由于岩盐独特开采方法和工艺,应探索相应的监管措施和手段。通过对大汶口岩盐资源赋存特点和开发利用现状分析,指出其开发过程中存在的问题,就岩盐开采方法和工艺的监管措施和手段进行探索,提出开发利用和保护建议,从而有利于促进加强岩盐资源的开发利用和保护工作。     

A niche model to predict Microcystis bloom decline in Chaohu Lake, China

Cyanobacterial blooms occur frequently in lakes due to eutrophication. Although a number of models have been proposed to forecast algal blooms, a good and applicable method is still lacking. This study explored a simple and effective mathematical-ecological model to evaluate the growth status and predict the population dynamics of Microcystis blooms. In this study, phytoplankton were collected and identified from 8 sampling sites in Chaohu Lake every month from July to October, 2010. The niche breadth and niche overlap of common species were calculated using standard equations, and the potential relative growth rates of Microcystis were calculated as a weighted-value of niche overlap. In July, the potential relative growth rate was 2.79 (a.u., arbitrary units) but then rapidly declined in the following months to -3.99 a.u. in September. A significant correlation (R=0.998, P<0.01) was found in the model between the net-increase in biomass of Microcystis in the field and the predicted values calculated by the niche model, we concluded that the niche model is suitable for forecasting the dynamics of Microcystis blooms. Redundancy analysis indicated that decreases in water temperature, dissolved oxygen and total dissolved phosphorus might be major factors underlying bloom decline. Based on the theory of community succession being caused by resource competition, the growth and decline of blooms can be predicted from a community structure. This may provide a basis for early warning and control of algal blooms.     

四川省小麦条锈病春季流行的农业气候风险区划

针对当前从气象风险角度开展小麦条锈病与气象关系研究甚少的状况,从农业气象灾害风险分析理论出发,采用相关分析、层次分析和极差正规化等方法,建立了包含气候条件和寄主存在数量两个环境因子的四川省小麦条锈病春季流行农业气候风险模型,并划分了高、中、低风险等级的指标.在此基础上,利用GIS技术对四川省小麦条锈病春季流行的农业气候风险进行了区划.结果表明,四川省的川西高原地区、川西南山地和盆地西南部是小麦条锈病春季流行低风险区,盆地大部地区是中、高风险的集中区.区划结果为进一步做好四川省小麦条锈病的分区预报和综合防治方面提供科学依据.     

Hematological changes in white spot syndrome virus-infected shrimp, Fenneropenaeus chinensis (Osbeck)

The pathological changes of hemocytes in the haemolymph and hepatopancreas were examined in experimentally and naturally WSSV (white spot syndrome virus) infected Fenneropenaeus chinensis. The results showed that the pathological manifestations of hemocytes were similar among moribund shrimps infected via injection, feeding and by nature. Firstly, the total hemocyte counts (THCs) in WSSV-infected shrimp were significantly lower than those in healthy shrimp. Secondly, necrotic, broken and disintegrated cells were often observed, and a typical hematolysis was present in the haemolymph smear of WSSV-infected shrimp. Thirdly, necrosis and typical apoptosis of hemocytes were detected with TEM in the peripheral haemolymph of WSSV-infected shrimp. Hyalinocytes and semi-granulocytes with masses of WSSVs in their nuclei often appeared, whereas no granular hemocytes with WSSV were found in the hepatopancreas of moribund infected shrimps. All our results supported that hemocytes were the main target cells of WSSV, and hyalinocytes and semigranular hemocytes seemed to be more favorable for WSSV infection in F. chinensis.     

宁阳县蒋集镇彩山小流域水土保持技术研究

该文分析研究了彩山小流域的区域坡度和土壤特性,并根据区内土壤性质划分出4个小区域,即:自然坡度在20.～25°内为V1区,15°～20°内为V2区,10°～15°内为V3区,5°～10°内为V4区,分别反映了不同的土壤等级及土壤抗冲能力.同时,也研究出了一个系统化、理论化的科学依据i=V1035B,并对所有砂石山区水土保持治理工作具有借鉴性和实用性.     

基于MRPs无陀螺卫星姿态确定的抗差估计算法

针对精确航天器姿态问题,采用修正罗德里格参数(MRPs)表示姿态,用动力学方程进行角速率的传播,分别基于等价协方差和观测残差统计特性的协方差调整方法,实现UKF算法的抗差效果,并通过仿真验证该方法的有效性。仿真结果表明：在含有粗差的情况下,两种抗差UKF算法均能得到稳定的状态估计值,而第二种方法计算效率更高。     

һ�ֹ������ǵ���ϵͳ����˥�����ӵ��·���

????????????λ????????????????DOP????????????????????????????????????伸?η????????????????????á????t?????????????????μ????????????????????????????????????????????????????б?????????μ????????????????????     

Nitrogen and phosphorus intake by phytoplankton in the Xiamen Bay

This paper describes a time series experiment examining the nitrogen and phosphorus intake of natural phytoplankton communities by a microcosms approach.Seawater samples containing natural phytoplankton communities were collected from waters around Baozhu Islet in inner Xiamen Bay and around Qingyu Islet in the outer bay.The goal was to elucidate the relationship between phytoplankton population enhancement,the biological removal of nitrogen and phosphorus from the seawater,and the phytoplankton nitrogen an...