含优面搜索法原理

本文为我们的快速算法是一般原则，即让迭代总是在含优面内进行，并且每次迭代从当前含优面的基点搜索到更低维含优面上的基点，如此只须至多ｎ步迭代可收敛到一个极点最优解。文中讨论了含优面的基本性质。     

电位溶出速率常数物理意义的探讨

本文从理论和实验上证明,汞膜和金膜电极的电位溶出过程的速率,由溶液中的氧化剂在电极表面的极限流量所决定,与氧化剂本身的氧化—还原过程中的电子转移数无关,从而获得了完全的常规电位溶出的过渡时间方程式。     

一种面向大规模用户的组安全管理体系

为了解决大规模组播的安全性和可管理性等问题,提出了一种面向大规模用户的组安全管理体系结构MGSMA.依据现代网络分为核心网和接入网的构成特点,MGSMA方案将组播安全分为主干区域和叶子区域两个层次,组成员管理由各个叶子区域负责.叶子区域将大规模的用户分为多个分组,并部署多个密钥分发器来进行分布式管理,将单个分组的用户规模减小,从而实现对多组播组和大规模用户的管理.MGSMA具有防止单点故障,易于扩展和部署的优点.     

High-frequency giant magneto-reactance effect in a composite wire LC-resonator

The BeCu/Insulator/CoP composite wires were prepared by electroless-deposition on insulated BeCu wire. The composite wire constructs a serial LC resonant element by itself. Due to the LC resonance, very large high-frequency magneto-reactance effect is observed at near the LC resonance frequency, and the maximal magneto-reactance ratio for the composite wire with length of 5 cm is 1.08×107% at 58924500 Hz. The LC resonance frequency decreases with the increasing length of the composite wire. The practical working frequency, at which the very large high-frequency magneto-reactance effect is observed, can be controlled through controlling the LC resonance frequency. The LC resonance mechanism is also analyzed.     

Suppressor of RNA silencing encoded by Rice gall dwarf virus genome segment 11

Rice gall dwarf virus （RGDV） is an important rice pathogen in China and Southeast Asia. However, little is known about the molecular mechanisms of RGDV interactions with plant cells. Here, we have identified an RGDV protein, Pns11, which acts as a suppressor of RNA silencing in coinfiltration assays with the reporter, green fluorescent protein （GFP）in transgenic Nicotiana benthamiana line 16c carrying GFP. Pns11 suppressed local and systemic silencing induced by sense RNA. The spread of mobile RNA silencing signals was blocked or inactivated by Pns11. Expression of Pns11 also enhanced Potato virus X pathogenicity in IV. benthamiana. This suppressor could reduce, but not eliminate, siRNA in the local and systemic RNA silencing suppression assays, suggesting that Pns11 functions by interfering with initial stages of RNA silencing.     

催化裂化反应工艺技术进展

催化裂化工艺是炼油行业高效利用石油资源的一个重要手段。各炼油企业的原料性质差异和对产品分布的要求不同使催化裂化工艺的发展多样化。原油劣质化和环保要求越来越严格是催化裂化工艺发展的推动力;强化重油裂化能力、改善产品分布、提高产品质量、减少污染物排放和提高经济效益是其发展的出发点;提高剂/油比、缩短反应时间、让不同的反应分区进行、将部分待生催化剂循环等是其基本手段。     

Facile and environment friendly synthesis of hierarchical BiOCl flowery microspheres with remarkable photocatalytic properties

A facile and environment friendly approach to synthesis of unique hierarchical BiOC1 flowery micro- spheres （FMs） using a biodegradable surfactant polyvinyl alcohol （PVA） was reported herein for the first time. Com- pared to the BiOC1 nanosheets synthesized in the absence of PVA, hierarchical BLOC1 FMs consist of large amounts of interwoven polycrystalline nanosheets that assemble into a porous flowery structure. The formation mechanism of the hierarchical BiOC1 FMs was also proposed, whereby PVA was believed to play a key role in the crystal growth and the formation of the final microstructures. Compared with TiO2- P25 and BiOC1 nanosheets, hierarchical BiOC1 FMs dis- played remarkably enhanced photocatalytic activity, and 20 mg of BiOC1 FMs could completely degrade 50 mL of methyl orange solution （20 rag/L） within 30 min under UV- light irradiation. According to the comprehensive analysis, it can be concluded that the larger specific surface area, porosity, suitable band gap, and the enhanced light absorp- tion capacity may contribute to the remarkably enhanced photocatalytic activity. This facile and green approach to fabricating hierarchical BiOC1 FMs would give vital clues to develop new route for synthesizing other hierarchical structured materials.     

CECE法重水电解分离氚的热力学研究

文章研究了CECE法中D2-含氚重水同位素交换以及电解的热力学问题,即可逆分解电压和2个反应(19-1) 和(19-2)的热力学平衡条件。研究给出了H2O, HDO, D2O, DTO和T2O的可逆分解电压。H2O(0) 与T2O(4)的可逆分解电压的相差为0.047 V,如要保留T2O,则实际的分解电压不能大于H2O的分解电压。同时,导出了这5种氢同位素水的平衡蒸汽压和汽化热与温度(0～100 ℃)的函数关系。从热力学来讲,反应(19-1)和(19-2)的平衡常数都很小,在静态反应中难以实现,如果在流动系统中,则能符合条件Q < K,使反应进行。电解分离氢同位素水的最大的难点是选择性差,可以探索使用光催化分离的方法。     

有固相析出的多效两段蒸发 系统模型与过程模拟

建立了带有冷凝水闪蒸的有固相析出的多效两段蒸发系统的常规设计数学模型,模型将系统的相平衡关系用回归式表达,使模型可以用计算机编程求解,避免了手工计算结合查相图的烦琐的计算过程;利用矩阵方程具有结构清晰和高度模块化的特点,将系统的物料衡算和热量衡算方程组写成矩阵方程的形式,只要保留或舍弃矩阵方程中的相关块矩阵,模型就能代表没有冷凝水闪蒸或没有固相析出的多效两段蒸发系统常规设计模型;采用迭代法结合矩阵法来求解模型,算例表明,冷凝水闪蒸对多效两段蒸发系统是有效的节能措施,算法收敛速度快、收敛稳定性好。     

独轮自平衡电动车的建模与运动平衡控制

为了设计新型、环保、便捷的智能代步工具,搭建了一款独轮自平衡电动车物理系统。利用拉格朗日方法建立了人车一体的动力学模型,并对系统进行了特性分析。设计了独轮车系统的比例微分(proportional-differential,PD)平衡控制器,并对独轮车系统分别进行了自平衡、冲击干扰和阶跃干扰实验。实验结果表明,独轮自平衡电动车系统具有较好的鲁棒性和操控性,证明设计方案的合理性和有效性。