电子商务模式分析过程研究

本文对电子商务模式的基本概念进行科学界定的基础上,对电子商务模式进行较系统的描述,同时建立电子商务模式分析模型,并对此模型的思路与方法进行系统阐述。     

平菇多糖提取方法的比较

以平菇为原料, 分别采用破碎、 超声波和超声辅助复合酶3种提取方法提取平菇水溶性多糖. 正交优化结果表明： 提取温度90 ℃, 剪切速率11 350 r/min, 提取时间20 min, 提取3次, 破碎法提取多糖得率为11.20%; 提取温度60 ℃,  超声功率450 W, 提取时间60 min, 提取3次, 超声法提取多糖得率为9.75%; 提取温度30 ℃, 超声功率350 W, 提取时间60 min, 溶液pH=5, 超声辅助复合酶法提取多糖得率为12.05%. 综合考虑提取得率、 节能环保、 操作方法等因素, 选用破碎法提取平菇多糖较理想.     

双阻带小型化频率选择表面的设计

设计了一种通过加载电容和增加电长度的方法实现小型化的双阻带频率选择表面。这种频率选择表面单元具有双周期结构,从而实现了双阻带特性。在十字单元结构之间加载集中电容,可以大大降低单元结构的串联谐振频率,实现S及C波段的带阻特性;金属短线的扭曲结构则通过增加电长度提高等效电感,得到Ku波段的带阻特性。仿真结果表明：对不同角度入射波该结构保持了十分稳定的传输特性,同时由于良好的对称性,该结构对平面波的2种模式——TE及TM模式传输特性基本相同，验证了通过加载电容和增加电长度实现小型化的方法,对FSS的设计具有很好的参考价值。     

复杂疾病的系统医学视角:内源性网络理论

随着分子生物学的发展,对表型背后复杂的分子调控机制进行系统和定量分析成为当前重要研究方向之一。内源性网络理论提供了一种可行的方法,可以通过总结已有的生物学知识构建系统核心调控网络,并利用非线性随机动力系统对网络进行定量分析。本文主要回顾了内源性网络理论的核心内容及迄今为止基于该理论框架下所取得的成果。在内源性网络理论框架下,我们可以利用功能性景观理解复杂疾病的发生发展过程,作出可验证的全新预测,进而为复杂疾病预防、诊断、治疗提供一系列潜在的思路和方案。     

Sn-Co薄膜电极界面过程原位傅里叶变换红外光谱表征

锂离子电池的界面反应对电池的循环性能、寿命、化学和物理稳定性,以及不可逆容量有重要的影响.运用显微傅里叶变换红外光谱(microscope FTIRS,MFTIRS)深入地研究了Sn-Co电极的界面反应和过程.结果表明,原位显微傅里叶变换红外光谱可清楚地给出Sn-Co合金的嵌锂和脱锂过程中的溶剂化和去溶剂化信息.     

Ultrafast dynamics and dissociative ionization of CS<Subscript>2</Subscript> molecules studied via the femtosecond pump-probe method

The ultrafast dynamics and dissociative ionization of CS2 were studied using the pump-probe method with time-of-flight mass spectroscopy. The transient behavior of both parent ion (CS2+) and fragment ions (S+ and CS+) was observed. It was found that all the ionic signals decay exponentially with lifetimes that were different for delay times, t>0 and t<0, which can be attributed to the evolution of different Rydberg states pumped by 267-nm and 400-nm laser pulses. The lifetimes of two Rydberg states were obtained simultaneously from one fitting of the transients. The fragment ions were produced by the dissociation of CS2+, and it is suggested that the final ionic state is the C2Σg+ state of CS2+ based on the measured S+/CS+ branching ratio. The S+/CS+ ratio is dependent on the delay time of the two lasers, indicating that the dissociation process of CS2+ is related to the evolution of the intermediate Rydberg state.     

武汉市屋顶农业调查研究——以武汉市汉阳十里铺社区为例

从设施结构、生产方式、栽培植物种类、栽培技术、环境及其调控等方面对武汉市汉阳十里铺一处屋顶农业示范基地进行实地调查,分析了武汉市屋顶农业的发展现状以及存在的问题,并对武汉市屋顶农业发展中的共性关键技术进行探讨,并提出了相应的改进建议,以期为武汉市屋顶农业建设提供参考依据.     

管模用21CrMo10材料的研制

研制了新型管模用２１ＣｒＭｏ１０钢,试验结果表明该钢具有良好的淬透性,焊接性能和综合机械性能。     

中主应力对土体本构关系的影响

本文根据常规三轴试验和平面应变试验结果,对以常规三轴试验为基础的土体本构模型在平面变形问题中的适用性进行了研究.文中用双曲线模型和双屈服面弹塑性模型对两种试样的变形进行了计算比较.结果表明,两种模型用于平面问题都有误差,主要是由于两模型中所含破坏准则没有很好反映中主应力影响所致;中主应力主要通过对破坏准则的影响来影响本构关系.改进破坏准则,变形计算可得到很大改善.     

Recursive Algorithm Based Reliability Analysis of Multiphase Satellite Systems with Propagated Failures

Modern satellite systems are generally designed to fulfill multiphase-missions. Component /subsystem redundancies are commonly used to achieve high reliability and long life of modern satellite systems. These characteristics have leaded to a critical issue of reliability analysis of satellites that is how to deal with the reliability analysis with multiphase-missions and propagated failures of redundant components. Traditional methods based on the binary decision diagram( BDD) can hardly cope with these issues efficiently. Accordingly, a recursive algorithm method was introduced to facilitate the reliability analysis of satellites. This method was specified for the analysis of static fault tree and it was implemented by generating combination of component failures and carrying out a backward recursive algorithm. The effectiveness of the proposed method was demonstrated through the reliability analysis of a multiphase satellite system with propagated failures.The major advantage of the proposed method is that it does not need composition of BDD and its computational process is automated.