中小型高炉喷煤自动化PLC解决方案

介绍了利用西门子S7-300系统及工业以太网实现中小型高炉喷煤的设计方法,阐述了系统硬件及设备设计和网络系统方案。此项目已成功应用,在高炉炼铁、系统稳定性、工作效率、可靠性及可操作性等方面,取得了良好的经济效果;     

关于自来水厂滤池自动控制的设计

本文来自大型市政供水工程设计一线多年积累的水厂气水反冲滤池的自动控制系统和仪表选型的设计思想和心得。     

通过计算评估变压器的使用寿命

变压器的寿命评估,对电力运行,电力系统单位非常重要(既能减少经济损失,又可以保证人身安全)。直接影响我们对变压器故障预防,和输变电网的调配。通过对变压器绝缘材料老化的分析、变压器使用温度、负载实时监测统计,利用计算机动态计算出变压器的使用寿命,实现对变压器寿命评估。     

The temperature of a vibrated granular gas

The temperature of a granular medium is defined, in a manner analogous to that of a molecular gas, as the root mean squared kinetic energy of the grains. Using a novel two-layer granular experiment, we have made a systematic study of the granular temperature as a function of driving parameters in order to determine whether the behavior of the granular temperature is truly analogous to the temperature of a molecular gas. By examining the behavior of this particular system in detail, where two fluctuating granular media are in thermal contact, we also suggest general conditions under which such analogies can be extended to other driven systems.     

基于PROFIBUS的6SE70变频器在连铸拉矫机中的应用

济钢第三炼钢厂1＃连铸机引进的是VAI（奥钢联）的板坯连铸机，为了实现对多达20台拉矫电机的控制，它用了负载分配控制技术。为实现负载分配技术，拉矫系统采用了基于PROFIBUS的西门予6SE70变频器构成的现场总线控制系统。本文介绍了该系统PROFIBUS硬件配置、软件编程和116SE70变频器通讯参数的设置.     

Strategies to Improve Field Emission Performance of Nanostructural ZnO

Nanostructural ZnO is a good candidate for field emission (FE) because of its high aspect ratio, controllable electrical conductivity, and good thermal and chemical stability. In order to improve the FE performance, ZnO nanopins, gallium-doped nanofibers, periodic nanorod arrays, and aligned nanotubes were designed and fabricated by a vapor-phase transport method using ZnO + C and ZnO + C + Ga₂O₃ powder mixtures, electrochemical deposition, and hydrothermal decomposition, respectively. The FE behaviors including threshold of electric field, emission current density, field enhancement factor, and stability are reviewed in this paper based on our previous works. Some strategies to improve the performance of the nanostructural ZnO field emitters are demonstrated.     

Carbon Nanotube Field‐Effect‐Transistor‐Based Biosensors

There is an explosive interest in 1D nanostructured materials for biological sensors. Among these nanometer‐scale materials, single‐walled carbon nanotubes (SWNTs) offer the advantages of possible biocompatibility, size compatibility, and sensitivity towards minute electrical perturbations. In particular, because of these inherent qualities, changes in SWNT conductivity have been explored in order to study the interaction of biomolecules with SWNTs. This Review discusses these interactions, with a focus on carbon nanotube field‐effect transistors (NTFETs). Recent examples of applications of NTFET devices for detection of proteins, antibody–antigen assays, DNA hybridization, and enzymatic reactions involving glucose are summarized. Examples of complementary techniques, such as microscopy and spectroscopy, are covered as well.