A Strategy for Dramatically Enhancing the Selectivity of Molecules Showing Aggregation‐Induced Emission towards Biomacromolecules with the Aid of Graphene Oxide

By intelligently utilizing the different interacting strengths between different moieties according to the displacement method, general biosensors with aggregation‐induced emission (AIE) characteristics for biomacromolecules without selectivity were converted to excellent, highly selective probes for one specific biomacromolecule with the aid of graphene oxide (GO) in an aqueous medium. Importantly, thanks to the different interactions between the AIE molecule and biomacromolecules, just by simply changing the AIE molecule the sensing system could detect different types of biomacromolecules, thereby providing a new approach to the development of AIE‐based sensors with high selectivity and sensitivity. More specifically, the complex of A₂HPS?HCl—a derivative of hexaphenylsilone (HPS) functionalized by two amino (A₂) groups (N(CH₂CH₃)₃)—and GO only gives an “off–on” response to DNA, with a detection limit of 2.3 μg mL^?1 toward DNA‐CT (calf thymus); interestingly, the complex of TPE‐N₂C₄ (1,2‐bis{4‐[4‐(N,N,N‐triethylammonium)butoxy]phenyl}‐1,2‐diphenylethene dibromide) and GO could only detect the presence of bovine serum albumin (BSA), whereas other biomacromolecules, including DNA, RNA, and even other proteins have very little influence.     

3-D numerical simulation of fracture processes in heterogeneous brittle materials

By using the lattice model combined with finite element methods and statistical techniques, a numerical approach is developed to establish mechanical models of three-dimensional heterogeneous brittle materials. A special numerical code is introduced, in which a lattice model and statistical approaches are used to simulate the initial heterogeneity of material properties. The size of displacement-load step is adaptively determined so that only few elements would fail in each load step. When the tensile principal strain in an element exceeds the ultimate strain of this element, the element is considered broken and its Young's modulus is set to be very low. Some important behaviors of heterogeneous brittle materials are indicated using this code. Load-displacement curves and figures of three-dimensional fracture patterns are also numerically obtained, which are similar to those observed in laboratory tests.     

模糊随机荷载激励下模糊桁架结构的模糊随机动力响应的双因子分析方法

采用了一种新的双因子分析法研究了模糊参数桁架结构在模糊随机荷载激励下的动力响应问题.同时考虑结构参数模糊性和外载荷幅值的模糊随机性,利用模糊因子法和振型迭加法求出了动力响应模糊随机变量;进而基于随机因子法推导了动力响应的模糊数字特征.最后通过算例考察了结构参数和荷载的不确定性对动力响应的影响.     

气固耦合振动叶栅非定常流动分析研究

引入结构动力学方程建立了二维N-S/结构振动耦合方程组,采用双时间法建立了气固耦合方程组的非定常数值求解体系,研究了叶栅间的二维非定常粘性流动及叶栅振动特性。对两种叶型分别计算了不同折合振动频率下的流场,振动叶栅位移随时间变化的曲线表明,采用气固耦合得到的叶栅振动频率与非耦合自振频率相比均有所下降;振动位移-时间曲线在不同振动折合频率下有显著差别。在气固耦合情况下叶栅振动规律及其稳定性与非耦合情形差异较大,因此研究叶栅振动稳定性应当考虑气动/结构的耦合。     

BM6201FS在无叶风扇控制系统中的应用设计

针对当前无叶风扇控制器存在成本高、稳定性差等问题,设计了一种低成本高稳定性的无叶风扇控制器;以 R5F104A单片机为控制核心,无位置传感器的三相无刷直流电机为控制对象,采用高耐压快速大功率MOS集成电路BM6201FS为电机功率驱动电路,降低无叶风扇电路系统成本,采用反电动势过零点检测法确定电机转子的位置信息,软件补偿硬件滤波电路产生的电机换相相移,提高控制器的可靠性;实验结果表明控制器工作稳定可靠,性价比高。     

Cu(DMBC)2(H2O)2(DMBC:3,5-二甲基苯氧基乙酸)配合物层状超分子的水热合成、结构及生物活性

用聚乙二醇400为相转移催化剂,由3,5-二甲基苯酚和氯乙酸合成了3,5-二甲基苯氧基乙酸(DMBC),用水热法将它与氯化铜合成了配合物Cu(DMBC)2(H2O)2,通过元素分析、红外光谱对其进行了表征;采用X射线单晶衍射法测定了其晶体和分子结构。其晶体属单斜晶系,P21/c空间群。晶胞参数:a=1.526(2)nm,b=0.7092(11)nm,c=1.0942(17)nm,β=104.567(15)°,V=1.146(3)nm3,Z=2,F(000)=478。在分子中,Cu(Ⅱ)分别与2个配体的羧基氧原子和2个水分子配位,中心离子构成稍微变形的平面四边形配位构型。分之间通过氢键和π-π相互作用自组装成稳定的二维层状超分子。利用Gauss03程序,在B3LYP/6-31G水平上对标题化合物进行了量化计算,给出了配合物分子中各原子的净电荷布居,计算结果与测定结果吻合。测试了该配合物对油菜籽发芽生长促进活性和抑菌作用。CCDC:909139