现场总线控制网络中OPC服务器的设计与应用

介绍了OPC（OLF for Process Control)技术及其在现场总线中的应用模式。给出OPC服务器的设计与实现的一种方法,并讨论了客户程序通过OPC服务器与现场设备的交互过程及OPC技术对现场总线的巨大影响。     

聚吡咯／聚合物固体电解质双层复合膜研究

在聚合物固体电解质（聚乙二醇不饱和聚酯网络－LiClO4)中进行吡咯聚合原位制得了聚吡咯／聚合物固体电解质双层复合膜。用扫描电镜观察复合膜的界面结构,用循环伏安和交流阻抗法研究了复合膜的电化学杂脱掺杂性能。结果表明,聚吡咯／聚合物固体电解质双层复合膜具有相互穿插渗透的固／固密接界面结构,这种界面结构改善了聚吡咯和聚俣物固体电解质间的界面接触,提高了聚吡咯在聚俣物固体电解质中的电化学掺杂脱掺杂性能。     

电化学聚合漆酚-锌金属螯合物合成及性质研究

以电化学方法合成了聚合漆酚（ＥＰＵ）,并用ＥＰＵ与二异丙氧基锌作用生成漆酚金属螯合物「ＥＰＵ－Ｚｎ（Ⅱ）」,采用原子发射光谱（ＡＥＳ）、ＦＴ－ＩＲ、ＤＭＴＡ、ＴＧ－ＤＴＡ和ＸＰＳ等对其进行表征,探讨其结构与性质。证明了螯合物中存在着因Ｚｎ（Ⅱ）和ＥＰＵ配位作用而引起的交联,故难溶于绝大多数的有机溶剂,玻璃化转变温度和耐热性能的提高。     

聚乙烯醇在α-Al_2O_3颗粒上的吸附平衡

考察了温度、悬浮液浓度、相对分子质量对聚乙烯醇 ( PVA)在 α- Al2 O3颗粒上吸附的影响 ,实验测定了相对分子质量为 80 0 0 0和 56 0 0的 PVA在 2 88.1 5K、2 98.1 5K和 30 8.1 5K、α- Al2 O3悬浮液质量浓度为 0 .0 5、0 .1 0和 0 .1 5时的吸附等温线 ,用 Langmuir吸附模型对实验数据进行了关联。结果表明 ,吸附量随悬浮液浓度的增加或温度的升高而降低 ,随 PVA相对分子质量的增加而增加。PVA相对分子质量越大 ,其吸附等温线受温度、悬浮液浓度的影响也越大。     

电化法研究壳聚糖树脂与游离酸的相互作用

利用电化学实验技术跟踪交联壳聚糖树脂吸附低浓度游离酸的行为,讨论了不同盐酸浓度和不同甲醇浓度两种因素对吸附的影响,并利用固液相互作用方程,求取吸附剂－吸附质相互作用能。实验结果表明,交联壳聚糖树脂吸附低浓度游离酸的过程是遵循单分子 机制进行的。     

Chloride Ion-Containing Polymeric Ionic Liquids for Application as Electrolytes in Solid-State Batteries

Organic, solid-state batteries require efficient solid electrolytes able to provide stable ion conduction. Here, solid electrolytes based on ionic liquid (IL) polymers with chloride counterions as electrolyte materials for batteries are presented. Acrylic monomers with imidazolium substituents with alkyl side groups that are linked by alkyl spacers to the acrylic group are employed. The IL monomers with chloride counterions are either converted by thermally initiated radical polymerization into linear homopolymers or incorporated into polymer networks by UV-initiated copolymerization utilizing a bifunctional, non-ionic cross-linker. Both procedures successfully yielded the desired materials, which is confirmed by NMR spectroscopy (linear homopolymers) or Raman spectroscopy (IL networks). The ionic conductivities at room temperature are measured by Electrochemical Impedance Spectroscopy. The ionic conductivities of the linear homopolymers are in the range of 10⁻⁴ to 10⁻⁶ S cm⁻¹, while those of the IL networks are about two orders of magnitude lower. They increase to 10⁻⁴ S cm⁻¹ at 70 °C. The electrochemical stability is examined by Linear Sweep Voltammetry and is proven in the voltage range of −2 to +2 V. The results reveal that the materials represent promising electrolytes for potential solid-state battery applications.     

An Integrated Micromachined Electrochemical Pump and Dosing System

In this paper a micromachined electrochemically driven pump capable of dosing precise nanoliter amounts of liquid is presented. The pump consists of a micromachined channel structure realized in silicon by reactive ion etching. On top of this structure a Pyrex((R)) cover piece with noble metal electrodes was bonded. The fluid to be dispensed is stored in a meander shaped reservoir which is part of the channel structure. This meander starts in an electrolyte solution containing reservoir, on top of which two noble metal electrodes are positioned. By the electrochemical production of gas bubbles by electrolysis of water at these electrodes, liquid can be driven out of the meander. The measured volume displacements were in close agreement with theory. Pump rates as low as a few nl/s could accurately be controlled via the actuation current through the electrodes. By applying current pulses rather than a continuous current, preset amounts of fluid in the nanoliter range could be dosed successfully. Because the resulting device consists of simple channel structures and metal electrodes it can easily be integrated in miniaturized chemical analysis systems to dose reagents or calibration solutions.     

A new surgical technique for deep stromal, anterior lamellar keratoplasty

AIMS: To describe a new surgical technique for deep stromal anterior lamellar keratoplasty. METHODS: In eye bank eyes and sighted human eyes, aqueous was exchanged by air, to visualise the posterior corneal surface--that is, the "air to endothelium" interface. Through a 5.0 mm scleral incision, a deep stromal pocket was created across the cornea, using the air to endothelium interface as a reference plane for dissection depth. The pocket was filled with viscoelastic, and an anterior corneal lamella was excised. A full thickness donor button was sutured into the recipient bed after stripping its Descemet's membrane. RESULTS: In 25 consecutive human eye bank eyes, a 12% microperforation rate was found. Corneal dissection depth averaged 95.4% (SD 2.7%). Six patient eyes had uneventful surgeries; in a seventh eye, perforation of the lamellar bed occurred. All transplants cleared. Central pachymetry ranged from 0.62 to 0.73 mm. CONCLUSION: With this technique a deep stromal anterior lamellar keratoplasty can be performed with the donor to recipient interface just anterior to the posterior corneal surface. The technique has the advantage that the dissection can be completed in the event of inadvertent microperforation, or that the procedure can be aborted to perform a planned penetrating keratoplasty.