方舱自动收扩系统研制

本文针对方舱液压扩展的不足，设计了电动控制系统，实现一扩三方舱的全自动扩展、撤收和自动调平，整个控制系统以PLC为核心，各传感器以现场总线连接。将时分复用技术用于主电路设计，实现4台变频器分时驱动10台电机，节约了成本。     

NMS2000系列网络型智能控制调度模拟屏在县级调度中的应用

随着电网的不断发展和无人值守变电站的实现，调度工作日益重要，调度模拟控制系统作为调度员日常工作的重要工具尤为突出，三水供电分公司于2001年对原有调度模拟屏进行了改造，使用的是NMS—2000系列网络型智能控制调度模拟屏控制系统，为此，本文探讨了网络型智能控制调度模拟屏系统的原理．系统结构和功能特点。NMS—2000系统投入运行后，大大提高了佛山三水区电网调度的自动化水平。     

PROFIBUS现场总线在润滑油包装线上的应用

本文介绍了PROFIBUS现场总线在润滑油包装线上的应用，重点介绍了PROFIBUS-DP的应用。     

城市轨道交通建设规划社会经济评价编制内容初探

随着我国经济的稳定快速发展和城市化进程的加快，越来越多的城市为了解决交通阻塞困扰或引导城市发展需要建设轨道交通。为此国务院办公厅颁发了“加强城市快速轨道交通建设管理的通知”，通知要求：拟建城轨交通项目的城市应组织制订城轨交通建设规划，明确远期目标和近期建设任务，以及相应的资金筹措方案。由于近几年才开始编制城市轨道交通建设规划，其编制内容还处于探索阶段。而社会经济评价作为城市轨道交通建设规划的重要组成部分，探索其编制内容对城市轨道交通建设规划的编制是非常有意义的。     

Design and testing of micro fluidic chemical analysis chip integrated with micro valveless pump

Micro fluidic analysis technology has been developed rapidly since the 1990s. The essentials of the technology are fabricating the micron structure (usually net channels, 20―100 μm wide and 10―30 μm deep) in chips by micro processing, and analyzing the fluids of samples or reagents chemically when they are controlled to flow and to be mixed in the micro structures. The occurrence of the technology makes the miniaturiza-tion, integration and portability of chemical detecting devices possibl…     

Sulfide assemblages in granulite xenoliths from Hannuoba Basalt, Hebei Province, China

Granulite xenoliths are important samples for understanding the forming and evolution of the crust. The granulite xenoliths enclosed in Cenozoic basalt of Hannuoba, Hebei Province, China, contain four types of sulfide assemblages: isolate rotundity enclosed sulfides, intergranular sulfides between minerals, secondary sulfide inclusions ranging in linear, and fissure-filling sulfides.Electron microprobe analysis shows that the components of sulfides are Ni-poor pyrrhotite with the molar ratios of (Ni Co Cu)/Fe less than 0.2. The molar ratios of (Fe Cu Co Ni)/S are less than 0.875 of normal pyrrhotite, and are less than those of mantle xenoliths, reflecting a sulfur-saturated environment. Pyrrhotite in various occurrences contains some Au and Ag, with the averages of 0.19wt%-0.22wt% Au and 0.01wt%-0.02wt% Ag, showing the gold mineralization related to the granulitization of low crust. Ni, Co and Cu have a normal correlation with S in pyrrhotite, indicating that heavy metal elements have a same source similar to sulfur because of the degasification of upper mantle.     

Synthesis of mesoporous carbon as electrode material for supercapacitor by modified template method

The pore structures and electrochemical performances of mesoporous carbons prepared by silica sol template method as electrode material for supercapacitor were investigated. The mean pore size and mass specific capacitance of the mesoporous carbons increase with the increase of mass ratio of silica sol to carbon source （glucose）. A modified template method, combining silica sol template method and ZnCl2 chemical activation method, was proposed to improve the mass specific capacitance of the mesoporous carbon with an improved BET surface area. The correlation of rate capability and pore structure was studied by constant current discharge and electrochemical impedance spectroscopy. A commercially available microporous carbon was used for comparison. The result shows that mesoporous carbon with a larger pore size displays a higher rate capability. Mesoporous carbon synthesized by modified template method has both high mass specific capacitance and good rate capability.     

Surface oxidation behavior of Mg-Y-Ce alloys at high temperature

After the Mg-Y-Ce magnesium alloy was exposed to air at a temperature up to 1173 K for 0.5 hours, the dense and compact oxide film formed on the surface. Accordingly, oxidation and ignition of magnesium alloys at elevated temperature was successfully retarded by the Y and Ce additions. Thermogravimetric measurements in air revealed that the oxidation dynamics curves measured at 673 and 773 K followed the parabolic-line law and the curve investigated at 873 K followed the complicate quartic law. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicated that the oxide film on the surface of Mg-Y-Ce alloys exhibited a duplex structure, which agreed with the results of thermodynamic analysis. The oxidation film included two layers: the outer layer was a multiple structure of Ce_0.202Y_0.798O_1.601 and Y₂O₃, and the inner layer mainly consisted of metal Mg and MgO.     

Characterization of (Y,Gd) BxV1-xO4-x:Eu Phosphor Prepared by Coprecipitation Reaction

White body-color (Y, Gd)BxV1- xO4-x :Eu3 phosphors were prepared by coprecipitation reaction. Under VUV excitation at 147 nm, the red emission colorimetric purity of (Y, Gd)BxV1- xO4-x :Eu3 phosphor is much better than that of commercial PDP (plasma display panels) phosphor (Y, Gd)BO3:Eu3 . But its relative emission intensity is only about 90% of the commercial phosphor.     

A new method for recovering valuable metals from low-grade nickeliferous oxide ores

A new method, the concentrated sulfuric acid acidolysis and water leaching (SAWL) of nickeliferous oxide ores, is proposed and the optimal conditions for recovery of nickel, cobalt and copper from a low-grade Chinese nickeliferous oxide ore are presented. A series of experiments were conducted which examined the effect of acid charge, acid curing temperature and acid curing time. Recoveries of up to 95%, 83% and 95% for Ni, Cu and Co, respectively were obtained with only the sulfuric acid at ambient temperature and atmospheric pressure. Comparing the percolation leaching with agitation leaching showed that percolation leaching was capable of extracting the valuable metals with water. The SAWL method was scaled to three-stages counter-current leaching tests using 1 kg of ore. The results indicate greater than 90% extraction for nickel and cobalt.