Synthesis and Morphology of TiO2 Nanotube Arrays by Anodic Oxidation Using Modified Glycerol-Based Electrolytes

Titanium dioxide (TiO₂) nanotube arrays were prepared by electrochemical anodization of titanium sheets in the glycerol 176 mL/H₂O 44 mL/NH₄F 0.5 wt% electrolytes modified with H₂SO₄ and NaAc addition. The surface morphologies, average inner diameter, and the length of the nanotube arrays changed with the solution pH in the range from 5.6 to 4.0 by adding H₂SO₄. A uniform surface morphology of the nanotubes with average inner diameter of ∼80 nm and a length of ∼1000 nm was obtained when the solution pH was 5.0. The growth rates of the nanotubes were remarkably enhanced by NaAc addition in the range of 0.04–0.14 M . With NaAc addition of 0.10 M , the length of the nanotube arrays reached 4.16 μm after an 8-h anodization, increasing 3.23 μm compared with no NaAc addition. The relationship between solution pH and growth of TiO₂ nanotubes was analyzed by current–time curves, solution electrical conductivities, and scanning electron microscopy (SEM), and the role of NaAc was also discussed based on SEM and solution electrical conductivities.     

液相合成纳米氧化锌及其光催化性能探讨

以硝酸锌和氢氧化钠为原料,分别以水和醇作为溶剂,采用液相直接沉淀法合成纳米氧化锌。在以水为反应溶剂条件下,研究了反应时间、反应温度、反应物浓度和反应物配比对纳米氧化锌中位径和形貌的影响,得到制备较小中位径及合适长径比纳米氧化锌的最优反应条件,即:反应时间为3 h、反应温度为70 ℃、锌离子浓度为0.5 mol/L、锌离子与氢氧根浓度比为1:2。在上述最优反应条件下,研究了不同醇溶剂对纳米氧化锌中位径、形貌及其光催化性能的影响。研究发现,随着溶剂碳链长度的增长,纳米氧化锌中位径呈现上下波动,无明显变化规律,形貌由球状向柱状发展,光催化性能总体不断减弱。     

基于大数据的电力信息技术发展探讨

电力行业大数据是综合电力企业生产、运营及销售等数据的信息系统,也是近年来电力发展的重要方向之一,如何提高大数据的分析利用能力也成为了电力企业发展中亟待解决的问题。本文主要阐述了大数据的定义及其对电网发展的影响,分析了电力企业业务信息中的大数据,重点研究额大数据的电力信息技术发展,以期为电力信息技术的发展提供理论指导。     

架空在“云”端的网络体系结构

随着近年来云技术的飞速发展,常规的数据网络在扩展性、带宽、规模、成本等方面都明显处于劣势地位,已经无法适应未来的发展需求。在这种情况下,云端网络技术在节约运算成本、提升公司运行效率方面有很好的效果。受到了企业的青睐。基于此本文对架空在“云”端的网络体系结构进行探讨。     

Random arithmetic formulas can be reconstructed efficiently

Informally stated, we present here a randomized algorithm that given black-box access to the polynomial f computed by an unknown/hidden arithmetic formula ? reconstructs, on the average, an equivalent or smaller formula \({\hat{\phi}}\) in time polynomial in the size of its output \({\hat{\phi}}\) . Specifically, we consider arithmetic formulas wherein the underlying tree is a complete binary tree, the leaf nodes are labeled by affine forms (i.e., degree one polynomials) over the input variables and where the internal nodes consist of alternating layers of addition and multiplication gates. We call these alternating normal form (ANF) formulas. If a polynomial f can be computed by an arithmetic formula μ of size s, it can also be computed by an ANF formula ?, possibly of slightly larger size s ^O(1). Our algorithm gets as input black-box access to the output polynomial f (i.e., for any point x in the domain, it can query the black box and obtain f(x) in one step) of a random ANF formula ? of size s (wherein the coefficients of the affine forms in the leaf nodes of ? are chosen independently and uniformly at random from a large enough subset of the underlying field). With high probability (over the choice of coefficients in the leaf nodes), the algorithm efficiently (i.e., in time s ^O(1)) computes an ANF formula \({\hat{\phi}}\) of size s computing f. This then is the strongest model of arithmetic computation for which a reconstruction algorithm is presently known, albeit efficient in a distributional sense rather than in the worst case.     

有机-无机(硅溶胶)复合涂料的制备

有机-无机(硅溶胶)复合涂料，既具有硅溶胶耐候性好、硬度高、附着力强、耐水、耐碱、耐沾污等特点，又具有有机聚合物成膜性好、韧性大、光泽高等特点。本法选用江阴国联化工有限公司生产的交联改性的苯乙烯-丙烯酸酯乳液与硅溶胶通过物理混拼法，并辅以适当的颜填料、助剂制备的涂料，可作为外墙封闭型底漆用于水泥砂浆、混凝土等硅酸盐基材及用于外墙装饰。文章还述及制备工艺及注意事项。     

利用仿真软件优化电磁场与电磁波教学

针对电磁场与电磁波课程理论公式复杂、相关概念模型抽象的特点,结合长期积累的教学经验,利用软件仿真将电磁场定理模型、分布特性可视化,简化推导计算过程,优化课程结构、节省课时的同时提高了教学效果。     

丙溴磷,杀螨隆,氟铃脲等防治小菜蛾及菜青虫试验

试验结果表明，丙溴磷、杀螨隆、氟铃脲等对小菜蛾均有效，且持效期长，丙溴磷具有速效性及对菜青虫高效。     

CC430F5137的低功耗无线数据采集节点设计

随着无线传感器网络的发展,无线网络数据采集节点的低功耗要求也不断提高。针对这一要求,利用内部集成了射频模块的CC430F5137设计并实现了一种低功耗无线数据采集节点。利用无线模块唤醒功能降低了系统功耗,同时根据载波监听功能改进了射频发送函数,提高了抗干扰能力。实验结果表明,该设计的低功耗和抗干扰方法是可行的。