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。     

基于C++ Builder的串口通信程序实现方法

在工业控制领域,计算机经常通过串口实现与单片机、DSP、PLC等的通信,并被广泛应用。文章叙述了在C++ Builder 6环境下串口通信的3种实现方法,并着重介绍了Windows的API通信函数。     

煤层地质条件的开采工艺性评价软件研制及其应用

在煤层地质条件的开采工艺性评价的基础上，分析了评价结构和指标量化方法，建立了煤层开采工艺性评价的模糊数学模型重点介绍了软件研制的基本思想和技术途径通过调查获取了大量矿井地质、开采资料，并采用该软件进行评价，初步获得了现阶段我国缓倾斜、倾斜煤层开采工艺选择的客观判据，提出了矿井地质条件开采工艺性分类方案为进一步建立全国煤炭开采评价体系提供了先进的技术手段     

满足CE 要求和TUV 认证的励磁调节器设计及验证

为了使产品达到欧盟安全标准,进入欧盟的励磁系统设备必须通过CE认证。励磁调节器是励磁系统的控制核心。为了更进一步提高控制系统的要求,在满足CE的基础上,需要按照TUV认证的要求进行设计。通过分析励磁调节器的作用,在电器件选型、电磁兼容设计、结构件及柜体设计等方面与相关指令进行核对,完成了调节器装置的设计。该装置一次性通过TUV验证,证明装置设计的合理性,为电力系统其他装置进行CE及TUV认证提供参考。     

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     

基于Lab Windows/CVI的GPIB虚拟仪器的设计

利用Lab windows/CVI的GPIB虚拟仪器远程控制系统,由FSP频谱分析仪、信号发生器、功率放大器等仪器组成,并通过GPIB总线与主控计算机相连.主控计算机内安装IEEE488标准接口卡,通过软件可对各测控设备实现远控和自动或半自动操作,同时对重要数据进行分析和储存.     

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.     

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.     

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.     

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。