Banach空间中的各种K可微性

引入了K -Gateaux可微、K -Fr啨ｃｈｅｔ可微、Ｋ -一致Gateaux可微、K -一致Fr啨ｃｈｅｔ可微等概念 ,并讨论了各种K可微性与对应的K光滑性的关系 ,给出一些等价条件。     

Effects of Ca on the distribution, structure and morphology of aluminum species in polyaluminum chloride

The flocculation efficiency of polyaluminum chloride (PAC) is closely related to the distribution and structure of its AI species, and Al13 is the optimal species in PAC for flocculation. A series of PAC containing Ca was prepared by adding Ca before and after the basifying reaction. The effects of Ca on the Al species were studied by ^27Al nuclear magnetic resonance (NMR) and atomic force microscope (AFM) techniques. The experimental results show that the introduction of Ca increases the content of Alm and Al13 in PAC and decreases their chemical shifts in NMR spectra due to the electric repulsion between the positive Ca species and AI species and the formation of AI-O-Ca complexes.With the rise of Ca/AI molar ratio, the AI species in PAC tend to scatter. It is observed that the formerly branch-aggregated clusters are tending to form granule-aggregated ones whose diameter gets smaller and smaller, and the floccule aggregates are formed at a higher Ca/Al molar ratio. The introduction of Ca to PAC, which increases the Al13 content, is certainly to enhance the flocculation efficiency of PAC in water treatment.     

RNA interference-mediated inhibition of Hepatitis B Virus replication

Persistent and recurrent infection of hepatitis B virus (HBV) represents one of the most common and severe viral infections of humans, and has caused a formidable health problem in the affected countries. Currently used antiviral drugs have a very limited success on controlling HBV replication and infection. RNA interference (RNAi), a process by which double-stranded RNA (dsRNA) directs sequence-specific degradation of target mRNA in mammalian and plant cells, has recently been used to knockdown gene expression in various species. In this study, we sought to determine whether RNAi-mediated silencing of HBV viral gene expression could lead to the effective inhibition of HBV replication. We first developed RNAi vectors that expressed small interfering RNA (siRNA) and targeted the HBV core or surface gene sequence. Our results demonstrated that these specific siRNAs efficiently reduced the levels of corresponding viral RNAs and proteins, and thus suppressed viral replication. Treatment with siRNA gave the greatest reduction in the levels of HBsAg (92%) and in HBeAg (85%) respectively in the cultured cell medium. Our findings further demonstrated that the RNAi-mediated antiviral effect was sequence-specific and dose-dependent. Therefore, our findings strongly suggest that RNAi-mediated silencing of HBV viral genes could effectively inhibit the replication of HBV, hence RNAi-based strategy should be further explored as a more efficacious antiviral therapy of HBV infection.     

光温水处理对龙胆草种子萌发的影响

以东北龙胆草为主要试材,研究了不同的光照、温度、水分条件对龙胆草种子萌发的影响.结果表明：在不同温度条件下,龙胆草种子萌发率和胚根生长速度明显不同,龙胆草种子的最适萌发温度为25℃;龙胆草种子是需光种子,光照对龙胆草种子萌发有促进作用,黑暗阻碍龙胆草种子的萌发;随着PEG-6000浓度的增加,龙胆草种子的萌发率和萌发势明显增强,适度的干旱处理有利于龙胆草种子的萌发.     

语法隐喻与概念隐喻的关系初探

本文主要讨论语法隐喻与概念隐喻二者之间的关系。论文首先分别简单介绍语法隐喻和概念隐喻的基本理论，然后重点论述二者的异同。在此基础上作者得出结论，认为语法隐喻和概念隐喻在运作机制上具有一定的互补性。     

Novel multiferroicity in orthorhombic SmCrO3

This paper reports the ferroelectricity in antiferromagnetic SmCrO_3 with a reasonably large value of spontaneous electric polarization(70μC/cm~2mC cm~(-2)at 50 K)based on the measurement of pyroelectric current.The experimental results showed that the temperature of the onset of polar order was evidently higher(about220 K)than the Neel temperature(T_N=197 K)in the magnetodielectric studies.The calculated magnetodielectric effect(MDE)value was explicitly negative with maximum|MDE|values of about 3.6%around 230 K.The absence of a convincing signature in MDE at antiferromagnetic ordering temperature T_Nindicated the absence of magnetoelectric coupling around this temperature regime.The results further confirmed that the onset of polar order can be attributed to the structural distortion,rather than the canted noncollinear magnetic structure.     

应急资源配送中Dijkstra改进算法的研究

路径规划问题是应急资源配送中的核心问题,最短路径算法在路径规划过程中起着决定性的作用,在众多路径规划算法中最经典且最具代表性的就是Dijkstra算法。以传统的Dijkstra算法分析为基础,从存储结构和算法过程两个方面进行一定程度的改进,目的是在节点数和边数较多的情况下,提高网络模型的处理效率。以真实道路交通数据为基础进行相关实验,结果证明,改进后的Dijkstra算法可以有效减少节点的计算量,提高算法的运行效率。     

货币账户带时滞的期权定价

在股票价格过程和货币市场账户均受时滞影响时,利用无风险对冲原理和鞅定价原理,得到了标准欧式期权的价格公式.研究表明,时滞对期权价格公式有明显的影响.     

井下车用零件多裂纹扩展的时变可靠性分析

针对工程中井下车用零件的多裂纹损伤问题，通过扭转疲劳试验模拟了车用零件中传动轴的疲劳损伤，并应用长焦显微镜与照相机相结合的测量法对零件一定疲劳循环次数后的表面裂纹进行了测量统计，同时以Paris模型及剩余强度估算模型对统计数据进行处理，得到了剩余强度.再应用所建立的时变可靠性数学模型，求取了零件时变强度的漂移率及波动率，并最终得出了该零件在一定疲劳循环后的可靠度.该方法从实际应用上解决了时变理论对零部件时变强度的动态检测问题，将时变理论向工程化应用推进一步，具有良好的应用前景.