Preparation and characterization of Ni/Co bimetallic nano-clusters

Ni/Co bimetallic nano-cluters have been prepared from the aqueous solution by reducing their corresponding metal salts under suitable conditions. The experimental conditions including the type and concentration of protective agent, feeding order and the pH of the solution that influence the average particle size have been studied in detail. Transmission electron microscopy (TEM) indicates that the shape of those bimetallic nano-cluster particles is spheroid. The alloy structure has been shown by X-ray powder diffraction (XRD). The X-ray photoelectron spectroscopic (XPS) data have confirmed that the nickel and cobalt in the bimetallic nano-clusters are in the zero-valence state.     

配料车间Modbus plus网络控制系统设计

本文简要介绍了Modbus plus总线协议，分析了基于Modbus plus总线协议的某炼铁厂配料车间，配料闭环现场总线控制系统的网络设计。     

Effects of Deposition Temperature on the Properties of Fluorinated Amorphous Carbon Films

Fluorinated amorphous carbon films (a-C:F) were prepared at different temperatures using a microwave electron cyclotron resonance chemical vapor deposition (ECR-CVD) reactor with CHF3 and C2H2 as source gases. Films were annealed at 500℃ in vacuum ambience inorder to investigate the relationship of their thermal stability, optical and electrical propertieswith deposition temperature. Results indicate that the films deposited at high temperature have a less CFx bonding and a more cross-linking structure thus a better thermal stability. They also have a lower bandgap, higher dielectric constant and higher leakage current.     

Flow Simulation and Optimization of Plasma Reactors for Coal Gasification

This paper reports a 3-d numerical simulation system to analyze the complicated flow in plasma reactors for coal gasification, which involve complex chemical reaction, two-phase flow and plasma effect. On the basis of analytic results, the distribution of the density, tempera-ture and components‘ concentration are obtained and a different plasma reactor configuration is proposed to optimize the flow parameters. The numerical simulation results show an improved conversion ratio of the coal gasification. Different kinds of chemical reaction models are used to simulate the complex flow inside the reactor. It can be concluded that the numerical simulation system can be very useful for the design and optimization of the plasma reactor.     

低压断路器的新材料和新工艺应用

对引进德国西门子公司技术制造的3WE系列断路器在新材料和新工艺应用方面与国内此领域传统使用的材料和工艺进行了分析、对比。期望能对国内同行在产品设计、制造和改进过程中起到借鉴和参考作用。     

传感器的真空循环注油法

根据实际要求和目前的注油方法及装置的情况，提出了真空循环注油的思想，设计并研制成功了这种注油装置；介绍了它的工作过程原理、特点及应用情况．     

基于电压波形分析的十二相整流装置故障诊断

通过对十二相整流装置正常工作和故障运行时，整流元件电压波形的分析，提出了用以判断整流元件工作状态的特征函数，根据由该函数求出的特征值，可以对十二相整流装置的故障（包括复合故障）进行在线诊断，确定故障性质，并能准确定位到具体元件。     

STD总线多功能CPU板的设计

ＳＴＤ总线工业控制机目前在工业现场中应用极为普遍，但所利用的ＣＰＵ板的功能却比较单一，不能单独形成系统，本文介绍一种ＳＴＤ总线多功能ＣＰＵ板的功能和电路设计．     

造纸过程中定量检测系统的研究

介绍了以MCS－51系列单片机为核心的定量检测系统的基本原理。并对其硬件结构和软件设计进行了详细地介绍。     

无线环境下一种新的证书状态查询方案

分析有线环境现有证书状态查询方案的基础上,提出了一种对传统的 O C S P进行了改进的方案-用户端部分缓存的ocsp方案,并将其与其他证书状态查询方案进行了比较。该方案借鉴了哈希链的思想,具有很高的安全性,可以有效减少用户端及服务器端的运算量,降低带宽负荷,适合用作无线环境下的证书状态查询方案。