YS—80系列仪表通讯接口适配器

本文介绍实现YS－80仪表与适配器的设计思想，硬件构成，软件实现，其技术关键在于通讯软件实现。     

Pb（Fe2／3W1／3）O3的制备及其介电性能研究

本文采用半化学法，即硝酸铁代替传统氧化物混合法中的三氧化二铁与PbO和WO3浆料混合，经850℃，2h预烧，一步合成了钙钛矿单相的Pb(Fe2/3W1/3)O3(PFW)预烧粉体；再经870℃和2h烧结，得到了纯钙钛矿相的PFW陶瓷，其理论密度大于98%，在1kHz时的最大介电常数εmax为8000，高于二次合成法和传统氧化物法制备的PFW陶瓷，表明半化学法对制备PFW陶瓷是可行的。     

Isothermal Gas Forming of Mg Alloy AZ31 Sheet

There have been reports on sheet forming of Mg alloy in industry via the punch and die method;this paper is probably the first formal one for studying the sheet formability of AZ31 employing pressurized gas to press the sheet into a female die cavity at various elevated temperatures.The results indicate it is feasible to form a rectangular box via pressurized gas from extruded sheets of 0.5 and 1.7 mm thick.The formed box has 1:2 depth over width ratio,which should be large enough when dealing with realistic industrial sheet forming parts.Presently,forming a sheet of 0.5 mm thick is considered a technical challenge by industry,and it is conquered as demonstrated in this paper.Gas forming technique applied to Mg alloy is unprecedented and shows potential for industrial utilization.     

Influence of Ti Powder Characteristics on Combustion Synthesis of Porous NiTi Alloy

Porous NiTi shape memory alloy (SMA) is a novel biomedical material used for human hard tissue implant .The influence of elemental titanium powder characteristics such as powder morphology, particle size and specific surface area( SSA) on the minimal ignition temperature ,combustion temperature and final product of porous Ni-Ti SMA fabricated by combustion synthesis method was investigated in this paper by scanning electron microscopy (SEM) and laser diffraction.The preliminary data indicated that the titanium powder characteristics had a strong effect on combustion synthesis of porous NiTi SMA.     

用正电子湮没技术研究微量铝对铁基非晶态合金的影响

用正电子湮没技术研究了七种铁基非晶态合金，结果表明铝含量高的合金的正电子湮没参数大于铝含量低的合金，意味着铝的存在会造成铁基非晶态合金微观结构的不均匀性，很可能是较多的类空位缺陷出现。     

Development and Commercial Application of a Novel Catalyst DVR—1 for Catalytic Cracking of Daqing Vacuum Residue

A newly developed catalyst type DVR-1 for catalytic cracking of Daqing vacuum resid was put into use in a commercial VRFCC unit,This catalyst features uniquely active matrix and modified ultra-stable zeolite.The commercial application results show that the DVR-1 type catalyst has the advantage of high heavy oil conversion,good metal tolerance nd gooed stability for catalyst regeneration,The FCC tests have shown Favorable product distribution,acceptable product quality and enormaous economic benefits whe processing the feedstock containin 75%-100% Daqing VR.     

充分利用余热节约能源

提出一种综合利用蒸汽 的方法，对整体综合利用蒸汽的成功经验和技术问题进行分析，介绍一种降低生产运行成本，节约能源的方法。     

露天煤矿边坡稳定性研究的系统观

从系统的观点，提出在分析露天煤矿边坡稳定时，要从露天矿边坡力学系统的环境、边界、结构及参数等方面综合考虑，为露天矿边坡稳定性研究提供了新思路。     

Lattice Effects and Irreversible Magnetoresistance in Gd Doped La—Ca—Mn—O

The Gd substituting effects for La in La0.67Ca0.33MnO3 has been studied .With increasing the substituting amount of Gd,the phase transition temperature of metal-isolator for the samples decreases,the corresponding peak resistivity increases,the Curie temperature decreases monotonically.The substitution of La-Ca-Mn-O with 11% Gd for La improved the magnetoresistance ratio by an order of magnitude.The effects of substituting Gd can be explained in terms of the lattice effects.An irreversible MR behaviour was observed in Gd-substituting compounds.This effect became marked when the substituting amount of Gd was greater than 7%.A maximum irreversible increment of MR ratio as large as 91% was obtained when Gd substituting amount was 11%.     

基于MPLS第三层VPN

基于MPLS第三层VPN技术由于只和MPLS域的边缘路由器发生关系，使得用户在不需要了解VPN拓扑结构的情况下就能完成对用户边缘路由器和提供边缘路由器的配置，这一点对VPN的可扩展性至关重要。更为重要的是基于MPLS第三层VPN可以将用户提升为服务提供，实现多层VPN。本通过一个实例介绍基于MPLS第三层VPN的工作机制。