Cefditorene-Mediated Synthesis of Silver Nanoparticles and Its Catalytic Activity

Ag(0) NPs were prepared by chemical reduction method in which silver nitrate was taken as the metal precursor and cefditorene as a reducing/capping agent and NaOH as the catalyst for reaction enhancement. The formation of the Ag(0) NPs was monitored using UV–Vis absorption spectroscopy confirmed the formation of Ag(0) NPs by exciting the typical surface plasmon absorption maxima at 405 nm. Transmission electron microscopy (TEM) confirmed the spherical morphology of the (Ag(0) NPs). The crystallite (11 ± 3 nm) and particle size (14.1 ± 2.2 nm) obtained from TEM and XRD analysis were coinciding with each other. Prepared Ag(0) NPs were then used as catalyst against 2-nitroaniline, 3-nitroaniline and 4-nitroaniline, which all showed best catalytic activity.     

Nanoflower hydroxyapatite's effect on the properties of resin-based dental composite

To investigate the reinforcing effect of nanoflower-like hydroxyapatite (NFHA) in resin-based dental composites, we synthesized a novel NFHA using microwave irradiation (MW), hydrothermal treatment (HT), and sonochemical synthesis (SS). Silanized NFHA was then used as the reinforcing filler in dental resin composites. We characterized the structure and morphology of various HA nanostructures using x-ray diffraction, scanning electron microscope, and TEM. The mechanical performance of dental resin composites reinforced with silanized NFHA was measured using a universal testing machine. Spherical HA, synthesized through chemical precipitation (CP), served as the control group. One-way analysis of variance was employed for the statistical analysis of the acquired data. The results demonstrate that the nanoflower morphology significantly was improved mechanical and physical properties. After conducting trials, the NFHA synthesized using MW and HT showed a substantial enhancement in mechanical and physical properties compared to the other structures. Therefore, it can be concluded that NFHA can serve as a novel reinforcing HA filler, providing regenerative properties to resin composites with sufficient mechanical strength.     

硝基苯酚类炸药C-NO2键中点静电势最大值与其实验撞击感度关系的研究

利用从头算法，计算了硝基苯酚类炸药C－NO2键中点电热，诗集 了硝基苯酚类炸药C－NO2键中点静电势最大值Vmidmax与其实验撞击感度h50%之间的关系。根据静电势数据，实验撞击感度和分子结构了硝基和羟基的相对位置以硝基和羧基的多少对这类炸药感的影响，采用最小二科原理对h50%和Vmidmax之间的关系进行了拟合，给出了它们所满足的函数关系。     

51单片机在全自动倒计时控制器中的应用

从现场实际出发，设计以51系列单片机为核心的全自动倒计时控制器。介绍实现系统功能所采用硬件组成、特点和工作原理，特别对市电掉电保护、时钟脉冲产生和抗干扰措施给出较为详细的叙述，分析了其软件设计技巧，并介绍了针对特定工作环境下做一系列特殊处理，该系统在实际运动中，实现了预期的特定功能。     

三维编织材料在骨修复领域中的应用

综述了骨修复材料的发展历史和现在所使用的骨修复材料的一些缺点，介绍了三维编织材料；结构设计灵活，异型件一次编织成型，结构不分层，力学性能优良等特点，分析了其作为一种骨修复材料的优越性，包括和骨的结构相似性，力学相容性，生物相容性以及此种材料在骨修复中的应用等，最后提出了三维编织材料在骨修复应用中要解决的主要问题。     

利用分形求约束问题的全局最优解

给出了几种基本几何图形的分形构造方法，并利用这种方法给出一种求解约束优化问题全局最优解的直接解决，算例表明，与一般的优化问题解法相比较，分形算法具有完全不依赖初始点、适用于任何以任意多边形或多面体为约束条件的非线性优化问题的优点。该方法充分利用了分形可以填满任意三角形、四面体等基本几何图形的这一特性。它可以很容易地推广到约束条件为平行四边形、平面上任意多边形以及三维以上空间中任意多面体或超多面体的优化问题上。     

浅析施工企业内部控制的建设

就新形势下施工企业内部控制建设的重要意义和应重点着眼的相关问题谈了一些看法。     

微波法从茶叶中提取茶多酚

介绍了以绿茶叶为原料 ,用微波加热法提取茶多酚 ,并通过改变溶剂、提取温度、提取时间等条件对产品提取率的影响进行了探讨 ,获得最佳的提取条件。该方法与传统提取方法相比 ,具有工艺简便、成本低、时间短、节省能源、产品收率高等优点     

补硫延长渣油加氢催化剂的寿命

在渣油加氢处理催化剂的稳态失活阶段,将含有硫化剂的馏份油送入催化剂床层,以提高循环氢中的硫含量。中试结果表明,每次补硫可大大延长催化剂的使用寿命。该工艺可应用于工业装置紧急停工后的重新开工过程中,能为炼油厂带来可观的经济效益。