氮掺杂纳米TiO_2改性涂料及其抗菌性能

将自制的氮掺杂锐钛矿型纳米二氧化钛光催化剂作为功能性组分,加入耐光催化氧化的硅丙乳胶涂料中,制备出一种新型光催化功能性建筑涂料,实现了可见光光催化效应。使用紫外-可见光吸收光谱研究该功能性涂料对紫外线的吸收能力;采用菌落计数法研究该涂料在可见光照射下对金黄色葡萄球菌的杀灭性能。同时分析了纳米粉体种类、引入量及方式对涂料紫外线的吸收性能和抗菌性能的影响。     

NPHMC: An R-package for estimating sample size of proportional hazards mixture cure model

Due to advances in medical research, more and more diseases can be cured nowadays, which largely increases the need for an easy-to-use software in calculating sample size of clinical trials with cure fractions. Current available sample size software, such as PROC POWER in SAS, Survival Analysis module in PASS, powerSurvEpi package in R are all based on the standard proportional hazards (PH) model which is not appropriate to design a clinical trial with cure fractions. Instead of the standard PH model, the PH mixture cure model is an important tool in handling the survival data with possible cure fractions. However, there are no tools available that can help design a trial with cure fractions. Therefore, we develop an R package NPHMC to determine the sample size needed for such study design.     

SiC陶瓷及其复合材料连接的研究进展

SiC陶瓷及其复合材料（SiCf／SiC、Cf／SiC）由于具有优良的高温强度、耐磨和抗腐蚀的性能而被广泛关注，而SiC陶瓷及其复合材料的连接是获得这一性能的关键技术之一。综述了SiC陶瓷及其复合材料连接的一般方法和连接技术，同时指出了连接技术的发展趋势。     

Zeolite‐catalyzed isomerization of oleic acid to branched‐chain isomers

Branched‐chain (bc) saturated fatty acids (SFA) have potential as oleochemical intermediates since they have better oxidative stability than linear unsaturated fatty acids (UFA) and have better low‐temperature properties than linear SFA. Previous studies in converting UFA to bc‐FA using clay catalysts have resulted in only modest yields and conversions. Recent reports, however, have suggested that certain zeolites can be effective catalysts for converting UFA to bc‐FA in higher yields and conversions. In this work, we examined the scope and potential of the zeolite‐catalyzed synthesis of bc‐FA starting from readily available monounsaturated linear FA. Our results show that common UFA such as oleic acid can be converted to bc‐isomers using modified Ferrierite zeolite catalysts with high conversions (98%) and high selectivity (85%) and that the zeolite catalysts are reusable for at least three cycles. The positions of branching (methyl) on the FA chain were determined from the GC‐MS spectra of the picolinyl esters of the bc‐FA.     

腐植酸类液体肥料生产技术和产品质量中的几个问题

本文通过胶体化学基本原理和实验数据，对水剂型腐植酸类液体肥料的组分、性质、浓度、流动性、稳定性、抗絮凝性等若干技术和质量问题进行了探讨，并提出一些改进建议。     

铝合金微弧氧化陶瓷膜的形成过程及其特性

分析了微弧氧化陶瓷膜形成过程，描述了样品表面微区弧光放电现象，并采用Ｘ射线衍射法（ＸＲＤ）和扫描电镜（ＳＥＭ）研究了ＬＹ１２铝合金微弧氧化陶瓷膜的相组成及形貌特征。结果表明，铝合金微弧氧化陶瓷膜主要α－Ａｌ２Ｏ３、γ－Ａｌ２Ｏ３组成，陶瓷氧化膜具有表面疏松层、致密层两层结构。微弧氧化技术是一种非常有前途的新技术。     

移动环境下一种缓存管理策略

移动计算环境中带宽具有非对称性,并且移动设备资源有限,传统的缓存管理策略需要占用大量的设备计算资源和网络带宽,有效的缓存管理技术能够极大提高移动计算的性能。对此提出一系列的针对移动计算的缓存管理策略。首先根据用户访问频率建立对应的具有生命周期的数据项缓存,然后使用自适应一致性维护策略维护缓存的一致性。通过实验分析,提出的管理策略能够很好地降低带宽占用,并且有效地减少对移动客户端的资源需求。     

室温超快速制备HKUST-1及其对甲苯的吸附性能

以硝酸铜和均苯三甲酸为原料,通过水滑石法室温10 s快速制备了一种金属有机骨架材料HKUST-1,对其进行了XRD、SEM和N_2吸附表征,测定了甲苯在HKUST-1上的吸附等温线、动力学和吸附-脱附循环性能。结果表明,水滑石的添加使HKUST-1可在室温10 s内快速合成,HKUST-1的BET比表面积达到2170.7 m~2/g,总孔容为0.97 cm~3/g。HKUST-1在25℃时对甲苯的饱和吸附量达到6.67 mmol/g,在低相对分压(p/p_0≈0.029)下,HKUST-1对甲苯的吸附量高于其他材料约10倍。经5次吸附-脱附循环后,HKUST-1的甲苯饱和吸附量几乎不变,具有很好的再生性能。     

中国零售业大数据应用现状与趋势探析

大数据几乎正在颠覆每一个行业,特别是零售业。2014年,零售业面临着市场环境和新一代消费者需求的巨大变化。本文主要以国内零售业大数据应用为重点进行研究,包括零售业发展周期、零售业大数据的类型和价值维度,分析了大数据在用户、市场、产品、供应链、运营等企业发展各个方面的应用,并对零售业大数据的发展趋势进行了预测。