ETSI EN 301893 V2.1.1中自适应测试方法及要点

介绍了ETSI EN 301893 V2.1.1:2017中的新增自适应测试参数,该测试是5G WiFi测试中的一个难点。通过对测试中遇到的常见问题及测试结果分析,指出了测试中需要注意的测试环境搭建细节。     

Dendrimer as nanocarrier for drug delivery

Dendrimers are novel three dimensional, hyperbranched globular nanopolymeric architectures. Attractive features like nanoscopic size, narrow polydispersity index, excellent control over molecular structure, availability of multiple functional groups at the periphery and cavities in the interior distinguish them amongst the available polymers. Applications of dendrimers in a large variety of fields have been explored. Drug delivery scientists are especially enthusiastic about possible utility of dendrimers as drug delivery tool. Terminal functionalities provide a platform for conjugation of the drug and targeting moieties. In addition, these peripheral functional groups can be employed to tailor-make the properties of dendrimers, enhancing their versatility. The present review highlights the contribution of dendrimers in the field of nanotechnology with intent to aid the researchers in exploring dendrimers in the field of drug delivery.     

Carbon nanotube–polyaniline composites

The last decade has seen a growing interest in hybrid electrically conducting nanocomposites. This article aims to provide a detailed overview of the present status of research in carbon nanotube–polyaniline (CNT/PANI) composites, from processing to structural and property evaluations. CNT/PANI are synthesized by electrochemical and chemical processing. When chemical methods are used, the main challenge is to obtain processable CNT/PANI in the emeraldine salt (ES) form composites. Stable dispersions of ES–CNT in organic media are prepared using the post doping method, inverse emulsion polymerization, or ex situ polymerizations. On the contrary, stable water dispersions of CNT/ES are prepared using hydrophilization of a preformed CNT/ES composite, direct synthesis of micelle–CNT hybrid templates, interfacial polymerization, covalent functionalization of CNT with a water soluble polymer, or using electrostatic interactions between two oppositely charged ES and CNT aqueous colloids. Moreover, the strategies for the synthesis of ternary CNT/PANI composites incorporating noble metal nanoparticles, metal oxide, or graphene sheets are also presented and analyzed in depth. Finally, we give a review of potential applications, including chemical sensors, capacitors, fuel cells and electronic devices.     

糖醇的选择性衍生-毛细管电泳检测法

建立了糖醇的CE-紫外衍生法:以三氧化二铝/甲烷磺酸为催化体系,苯甲酸为衍生化试剂,选择性酯化糖醇。以新型混合取代环糊精衍生物添加剂,分离检测不同糖醇。木糖醇、甘露醇、山梨醇、阿拉伯糖醇均得到较好分离,且木糖醇、甘露醇、山梨醇这三个糖醇的检测限分别达到9.1 ng/L,6.3 ng/L,10.2 ng/L。     

基于EVT的GPS RTK接收机研制

本文介绍了GPSRTK接收机的主要结构及其通讯功能 ,重点阐述WindowsCE编程的主要特点和编制接收机程序的关键技术。论证了运行WindowsCE的PDA结合GPSOEM板可以开发性能优越的GPSRTK接收机的可行性     

Apatite ore mine tailings as an amendment for remediation of a lead-contaminated shooting range soil

This study investigated the use of tailings from apatite ore beneficiation in the remediation of a heavily contaminated shooting range soil. The tailings originating in Siilinjärvi carbonatite complex, Finland, consist of apatite residues accompanied by phlogopite and calcite. In a pot experiment, organic top layer of a boreal forest soil predisposed to pellet-derived lead (Pb) was amended with tailings of various particle-sizes (Ø > 0.2 mm, Ø < 0.2 mm and unsieved material) differing in their mineralogical composition. After 9-, 10-, 14- and 21-month incubation, the samples were monitored for tailings-induced changes in the different Pb pools by means of sequential fractionation. Following the incubation, the samples were extracted with water and the extracts were analyzed for Pb species distribution by means of a cation exchange resin. The results revealed that Pb was continuously released from the shotgun pellet fragments due to weathering. However, the apatite and calcite compartments in the tailings counteracted the mobility of the released Pb through the formation of sparingly soluble fluorpyromorphite and cerussite. Furthermore, the tailings efficiently reduced the bioavailability of Pb by transferring it from the water-soluble and exchangeable pools into the organic one. The material also increased the proportion of the less toxic non-cationic Pb to the total dissolved Pb from the initial level of 5% to 9-12%. The results suggest that the tailings-induced stabilization of Pb may be an environmentally sound remediation technique at polluted sites.     

Transport of pollutant in shallow flows: A space–time CE/SE scheme

This paper focuses on implementation of space–time CE/SE scheme for computing the transport of a passive pollutant by a flow. The flow model comprises of the Saint-Venant system of shallow water equations and the pollutant propagation is described by a transport equation. The one-dimensional and two-dimensional flow equations are numerically investigated using the CE/SE scheme. A number of test problems are presented to check the accuracy and efficiency of the proposed scheme. The results of CE/SE scheme are compared with the central scheme. Both the schemes are found to be in close agreement. However, our proposed CE/SE scheme accurately captures shocks and discontinuous profiles.     

拉细羊毛微悬浮体染色

采用Lanasol CE型系列染料以微悬浮体形式对拉细羊毛进行染色，并与传统染色工艺比较。确定微悬浮体染色优化工艺为：甲酸用量1．5％（omf），微悬浮体化助剂WRJE量1．0％（omf），微悬浮体化助剂TS用量0．5％（omf），染色实验染料用量为5％（omf）。结果表明，采用微悬浮体染色工艺，可显著提高染料的上染百分率和固色率，同时在保证染色织物牢度的同时提高了手感和蓬松度。     

基于APAX5520的模拟训练系统

介绍某型舰艇动力模拟训练系统的组成与基本工作原理，阐述I／O设备的选型依据，介绍APAX5520CE的基本性能，及其在模拟器中的硬件配置方法和主要软件的编制思想。实践证明，基于APAX5520CE所设计的模拟训练系统运行稳定、扩展灵活。完全满足装备训练需求。     

并行工程下的面向制造的设计

结合并行工程的思想,对面向制造的设计进行了较详细的分析,指出面向制造的设计与并行工程的关系,提出了并行工程环境下面向制造的设计技术中存在的问题及对策,全面合理地对零件的面向制造的设计进行了评价,从而指导产品设计。