基于ＡＨＰ和模糊综合评价法在精品课程建设中的应用

针对原有的指标体系,以及对各高校精品课程建设质量评估指标体系进行综合分析,建立了重庆师范大学精品课程建设质量评估指标体系,通过对各评价方法优劣的分析,提出了精品课程建设质量的AHP和模糊综合评价法,以重庆师范大学一门精品课程为例进行了实证分析,证实了方法的有效性和合理性。     

酸性染料比色法测定千里光总生物碱含量

目的:研究测定千里光中总生物碱含量的方法。方法:以氧化苦参碱为对照品,采用酸性染料比色法,在422 nm波长处测定千里光中总生物碱含量。结果:氧化苦参碱在6.75~135μg与吸光度呈良好的线性关系(r=0.999 2),平均回收率100.0%(RSD=1.54%)。结论:该方法简便、准确,可用于千里光中总生物碱的测定。     

The dam design of Three Gorges Project

The dam of Three Gorges Project is a concrete gravity dam with the crest elevation of 185 m, the maximum height of 181m and dam axis length of 2 309.5 m. The dam consists of spillway, powerhouse, non-over flow, ship-lift, temporary ship-lock, left diversion wall and longitudinal cofferdam blocks. Some key techniques relating to dam structure design are presented, including hydraulics of flood discharge structure, dam joint design, layout and structural type of penstock, deep anti-sliding stability of dam foundation, reconstruction of temporary ship-lock and closed drainage and pumping of dam foundation.     

基于优化逆问题的Web服务选择

为提高服务提供商的服务被选率,将优化逆问题应用到Web服务选择领域,提出了Web服务选择优化逆问题,描述了此问题的解决步骤,比较了割平面法和Huang法的优劣,给出了改进方法.为提高Web服务选择优化的求解效率和优度,基于Web服务选择优化逆问题,设计出Web服务选择优化算法--逆选择算法,为服务请求者提供最优或近似最...     

Fibonacci数列推广

Fibonacci数列是从兔子繁殖问题引出的经典数列,从兔子繁殖角度出发,将经典Fibonacci数列进行多种形式的推广,总结出一般形式.利用k维空间上的变换方法,将代数学与几何学相结合,求出广义k阶Fibonacci数列的通项公式.结果表明,该通项公式可用数列的特征方程的解来表示.     

提高中药疏水性抗肝炎有效成分锚口山酮总苷溶出度

针对某些中药有效成分因水溶性差而引起药物生物利用度低的问题,选取具有抗肝炎活性的花锚总苷为研究对象,运用熔融法或溶剂法分别制备了4种不同载体组成的花锚总苷固体分散体,通过HPLC方法测定溶出度.研究结果表明,聚乙二醇4000、聚乙二醇6000、泊洛沙姆188、聚乙烯基吡咯烷酮k30均能与花锚总苷制备固体分散体,相对于花...     

毫米波MEMS开关自激励机理实验验证结构的模拟与设计

提出了一种新型的毫米波MEMS开关自激励机理的实验验证结构,该结构由一分四功率分配器和5个相同开关形成的阵列组成.通过CST Microwave Studio和HFSS电磁仿真软件完成了一分四功率分配器和开关阵列的设计.在频率为35 GHz时,一分四功率分配器的4个输出端口的隔离度小于-48 dB,同时由于结构的对称性...     

Enhanced low-temperature performance of slight Mn-substituted LiFePO<Subscript>4</Subscript>/C cathode for lithium ion batteries

Low temperature performance of LiFePO₄/C cathode was remarkably improved by slight Mn-substitution. Electrochemical measurements showed that about 95% of the discharge capacity of LiFe_0.98Mn_0.02PO₄/C cathode at 20°C was obtained at 0°C, compared to 85% of that of LiFePO₄/C cathode. The LiFe_0.98Mn_0.02PO₄/C sample also presented enhanced rate performance at −20°C with the discharge capacities of 124.4 mA h/g (0.1C), 99.8 mA h/g (1C), 80.7mAh/g (2C) and 70 mA h/g (5C), respectively, while pristine LiFePO₄/C only delivered capacities of 120.5 mA h/g (0.1C), 90.7 mA h/g (1C), 70.4 mA h/g (2C) and 52.2 mA h/g (5C). Cyclic voltammetry measurements demonstrated an obvious improvement of the lithium insertion-extraction process of the LiFePO₄/C cathode by slight Mn-substitution. The results of FSEM observation and electrical conductivity measurement indicated that slight Mn-substitution minimized the particle size of LiFe_0.98Mn_0.02PO₄/C and also obviously improved the electrical conductivity of the compound, thus obviously enhances the interface reaction process on the cathode.     

A broadcast signcryption protocol for ad hoc networks

Many previous broadcast encryption schemes can only guarantee confidentiality but cannot verify integrity and authenticity for broadcast messages.In this paper,a broadcast signcryption protocol for ad hoc networks is proposed based on cluster-based structure.The proposed protocol not only guarantees confidentiality but also verifies integrity and authenticity for broadcast messages.More importantly,the proposed scheme enables the cluster head to robustly add or remove any cluster member without changing secret key of other cluster members.Moreover,the proposed protocol avoids massive message exchange for key setup among cluster members.The analysis of security and performance shows that the proposed protocol is secure,efficient,and more practical protocol for ad hoc networks.     

青少年红色旅游产品开发研究——以湖南省为例

由于红色旅游具有思想性、知识性、时代性、观赏性和产品性等基本属性,因此,在青少年中开展红色旅游意义十分重大。青少年红色旅游产品的开发应围绕青少年旅游市场的特点和对红色旅游产品的基本要求进行。湖南省具有红色旅游资源数量丰富,类型多样;红色旅游资源品位高,分布相对集中;红色旅游品牌突出,在全国有相当品牌影响力等青少年红色旅游产品开发的良好条件,其开发的基本思路是:构建红色旅游产品体系,培养全国红色旅游第1品牌,打造毛泽东成长之路、重上井冈山之旅、红色根据地之旅等红色旅游精品线路,策划红色记忆.印象韶山实景表演、经典红歌大家唱广场晚会、红色军体休闲营地、第一军规综合园区等红色旅游重大开发项目。