二氧化钛固载杂多酸催化剂的制备及其光催化性能研究

采用浸渍法以TiO2为载体制备了固载型杂多酸光催化剂--H3PW12O40/TiO2,H8SiW12O42/TiO2,H7PMo12O42/TiO2.通过Hammett指示剂与紫外光谱相结合的方法测定固体杂多酸催化剂的酸度,分别考察杂多酸种类、浸渍时间、浸渍浓度、烧结方式、烧结温度对催化剂酸度的影响,并对所制备的催化剂进行了红外光谱和光催化活性测试.结果表明,杂多酸固载到TiO2的表面,得到了催化活性较TiO2更强的复合杂多酸光催化剂,其对酸性大红3R的降解率从纯TiO2的79%提高到91%.以磷钨酸水溶液浸渍TiO2,浸渍浓度为0.10 mol·L-1 ,浸渍时间为28 h,烘干温度为120℃,微波炉焙烧功率为650 W,烧结时间为40 min制得的催化剂活性最高.在HPA-TiO2光催化系统中,杂多酸显著加速电子从TiO2表面到O2分子的传递,改变了TiO2光催化反应历程,从而提高光催化效率.     

基于STM32F103的随钻测量系统

本文在仔细分析了随钻测量系统的工作原理之后,给出了随钻姿态测量的具体方法. 并使用STM32F103RET7和LSM303完成核心电路的设计. 完成数据采集和处理的工作. 最后给出上位机Labview程序实现数据的实时显示. 实验表明本文设计的嵌入式随钻测量系具有集成度高,精度高等特点.     

“A+一+X,B+一+Y”构式的分类及释义模板

该文以现代汉语中的“A+一+X,B+一+Y”格式为例,介绍了构建《现代汉语构式知识库》的初步工作。“A+一+X,B+一+Y”格式可根据其表义功能不同分为三个大类,十个小类。该文重点阐释了该构式表达“因果倚变义、事物交错义、状态交替义、动作行为交替义、周遍大量义、让步小量义”等6种意义的判定条件及相应的释义模板。     

Synthesis and characterization of biodegradable polyethylene by graft copolymerization of starch using glucose–Ce(IV) redox system

Graft copolymerization of low‐density polyethylene (LDPE) onto starch was carried out with glucose–cerium(IV) redox initiator in an aqueous sulfuric acid medium under nitrogen atmosphere. The graft yield was influenced by various parameters like reaction time, temperature, and concentrations of acid, glucose, polyethylene (PE), starch, and initiator. A maximum graft yield of 85.66% was obtained at a temperature of 50°C and at higher concentration of starch. Effect of grafting on crystallinity, morphology, and thermal properties of modified PE has been evaluated using X‐ray diffraction, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA/DTA). Biodegradability of starch‐grafted PE has been tested applying soil‐burial test. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3229–3239, 2006     

采用读卡机芯片FM1715SL设计的RFID读卡机

根据车辆管理系统对身份识别需求,提出基于国产芯片的RFID读卡机方案。数据接口设计为ISO14443TypeB的设备,在满足安全保密前提下,很好地兼顾了使用方便和高效便捷,大规模的车载应用验证了该方案的可靠性。     

Win7控制面板三大功能应用技巧

每个市场客户的需求是不一样的,使用情况也有差异.Win7的推出也是褒贬不一.Win7系统是微软开发的操作系统,在桌面、主题、功能、安全上相对于上一代系统有着很大的改进.以功能的强大及全面、存储空间小、操作系统简单和新增功能的人性化而受到用户的喜爱,且智能性上来说,Win7比XP要好很多.但是通过调查研究地发现,很多的用户对于Win7系统的使用仅仅停留在了表面阶段,对于系统中很多新的、提高便捷性的功能了解不足.因此,笔者通过这篇文章来研究和探讨win7系统的控制面板中三大功能的应用技巧,让win7系统能更好的为用户服务.     

基于R软件的金融资产收益波动率建模分析

金融资产收益波动率是金融计量分析的核心议题,该文考虑对其建模分析的计算机实现问题。利用R软件的强大计算与绘图功能,给出金融资产收益波动率各个模型的模拟实现以及对实际金融市场数据的各种建模分析。     

Characterization of Pheromone Blend for Grapevine Moth, Lobesia botrana by Using Flight Track Recording

The behavioral responses of Lobesia botrana males to calling females, pheromone gland extracts, and synthetic sex pheromones were recorded in a wind tunnel. Gland extracts and synthetic pheromones were released from a pheromone evaporator. The numbers of males reaching the source and their flight tracks in response to calling females and pheromone gland extracts were compared to those of synthetic blends. Upwind flights to natural sex pheromone were straighter and faster than to a three-component blend of (E)-7,(Z)-9-dodecadienyl acetate (E7,Z9–12:Ac), (E)-7,(Z)-9-dodecadien-1-ol (E7,Z9–12:OH), and (Z)-9-docecenyl acetate (Z9–12:Ac) (100:20:5). The optimum ratio of E7,Z9–12:OH and Z9–12:Ac to E7,Z9–12:Ac was found to be 5% and 1%, respectively. An additional seven compounds identified in the sex pheromone gland were investigated for their biological activity. Two unsaturated acetates, i.e., (E)-9-dodecenyl acetate (E9–12:Ac) and 11-dodecenyl acetate (11–12:Ac), increased the number of males reaching the source as well as straightness, linear velocity, and decreased the track angle of upwind flight. Optimum response was obtained by releasing 10 pg/min E7,Z9–12:Ac in a mixture with 0.5 pg/min E7,Z9–12:OH, 0.1 pg/min Z9–12:Ac, 0.1 pg/min E9– 12:Ac and 1 pg/min 11-12–Ac. The saturated acetates previously identified in the female glands were biologically inactive.     

3—乙酰基—5—溴 酚酮的合成

2-乙酰基-7-甲氨基酮1与溴反应得2-乙酰基-7-甲氨基-4-溴酮2。2与氢氧化钠反应得3-乙酰基-5-溴酚酮3。化合物2和3是两种新化合物,其结构已经红外光谱、核磁共振谱及元素分析证实。     

基于消息的Parlay X网关过载控制算法

为了解决目前Parlay X网关过载算法灵活性低、不能有效地使会话量最大化的问题,给出了基于合约的Parlay X网关系统架构。根据Parlay X消息类型特点设置消息优先级,根据消息优先级选择丢弃或者缓存消息,之后根据负载情况进行负载均衡以及接入控制,通过四个阶段来实现过载控制过程。实验结果表明,相比较于传统过载控制,该机制能在保证新建会话消息接收数量的同时提高其他类型消息的接收数量,减少平均服务时间,在满足合约限制的情况下,保证最大会话数量。