Cyclic oxidation behavior of Ni3Al-7.8% Cr-1.3% Zr-0.8% Mo-0.025% B between 900 and 1100°C

A Ni₃Al-based alloy, the composition of which was Ni-16.0% Al-7.8% Cr-1.3% Zr-0.8% Mo-0.025%B, was cyclically oxidized in the temperature range of 900 to 1100°C in air for up to 500 hr. The alloy displayed good cyclic oxidation resistance up to 1000°C, with little scale spallation. It, however, lost cyclic oxidation resistance during oxidation at 1100°C after about 200 hr, displaying large weight losses due to serious scale spallation. NiO, α-Al₂O₃, NiAl₂O₄ and ZrO₂ were formed. The oxide scales consisted primarily of an outer Ni-rich layer which was prone to spallation, and (Al, Cr, Zr, Mo, Ni)-containing internal oxides which were adherent due mainly to the formation of (Al₂O₃, ZrO₂)-containing oxides that keyed the oxide scale to the matrix alloy.     

医院容灾备份系统的研究与实施

随着医院信息化建设的不断深入,所产生的医疗数据量也越来越大,数据类型也越来越复杂,数据安全成为了现代医院信息系统安全的重中之重,如何构建一个统一、高效、安全可靠的存储管理体系,已成为当前医院信息化建设推进过程中亟须解决的重要问题。在对医疗数据存储研究的基础上,提出了基于虚拟化的容灾备份设计理念,通过采用虚拟化和块级数据同步引擎等先进技术,建立了无中断、零数据丢失的层次化容灾备份管理系统。通过建设虚拟化容灾备份系统,信息系统稳定性、可靠性得到了显著提升,实现了业务连续性保护。结论:基于虚拟化容灾备份系统的建设,最终实现了医疗数据的远程实时备份、信息系统的无中断运行及数据零丢失,保障了医院业务的正常开展。     

太阳能驱动的压缩吸收式复合制冷循环分析

根据传统太阳能空调的不足，提出了一个由太阳能驱动的新型压缩－吸收式复合制冷循环，同时通过压缩式制冷和吸收式制冷热力系数的比较，建立了该新型循环的热力学模型，并以一个典型的太阳日照为例，将新循环的性能系数与传统循环进行比较后得出：新循环在节能，提高性能系数以及运行的稳定性方面都比传统循环有了较大的提高。     

电磁成像系统在煤矿中的应用研究

EH4电磁成像系统是一套双源型电磁法数据自动采集和处理的物探系统，它是MT和CSAMT的结合体，适合地面2D连续EMAP张量式电导率测量。本文介绍了EH4电导率成像系统的原理、特点和该系统初次在煤矿进行的采空区、断层和钻孔位置等物探实例及其效果。     

基于B/S模式的可自助式计量委托单管理系统的设计与实现

在计量工作中,委托方及检测方之间主要业务交流是通过委托单的方式来完成的,在过去的计量活动中,委托单基本是由计量检测机构填写和完成。针对委托单业务进行具体分析,设计并实现了一种基于B/S模式的可自助式计量委托单管理系统,可以让委托方自主填写委托单,检测人员审核通过后即可生效。在保证委托单中信息准确的同时,也能够大幅减少计量检测机构的工作量,提高机构工作效率。以Oracle为数据库支撑,基于SSH和Ext JS框架进行代码开发,确保了系统的稳定和高效。     

纯棉机织黏合衬的无甲醛防缩整理

研究壳聚糖对纯棉机织衬布的无甲醛防缩整理,探讨壳聚糖用量、交联剂用量、焙烘时间及温度等因素对整理效果的影响。结果表明:壳聚糖防缩整理的最优工艺为壳聚糖用量3 g/L、交联剂柠檬酸用量12 g/L、80℃预烘4 min、160℃焙烘90 s;整理后衬布的白度为89.0,撕破强力保留率为55.9%,经向水洗尺寸变化率为-0.69%,纬向水洗尺寸变化率为-0.60%。     

Mg-based nanocomposites with improved hydrogen storage performances

MgH₂ is one of the most attractive candidates for on-board H₂ storage. However, the practical application of MgH₂ has not been achieved due to its slow hydrogenation/dehydrogenation kinetics and high thermodynamic stability. Many strategies have been adopted to improve the hydrogen storage properties of Mg-based materials, including modifying microstructure by ball milling, alloying with other elements, doping with catalysts, and nanosizing. To further improve the hydrogen storage properties, the nanostructured Mg is combined with other materials to form nanocomposite. Herein, we review the recent development of the Mg-based nanocomposites produced by hydrogen plasma-metal reaction (HPMR), rapid solidification (RS) technique, and other approaches. These nanocomposites effectively enhance the sorption kinetics of Mg by facilitating hydrogen dissociation and diffusion, and prevent particle sintering and grain growth of Mg during hydrogenation/dehydrogenation process.     

热轧卷板开平板的消应工艺研究

通过金属磁记忆法检测应力,提供热轧开平板分别在振动消应、一次校平消应、二次校平消应、三次校平消应、一次校平＋喷砂消应、直接喷砂消应等不同工艺措施后的消应效果。比对热轧板的内应力,选择一次校平＋喷砂工艺为热轧开平板的消应校平工艺。     

波分复用无源光接入网生存性机制的分析与设计

在介绍波分复用无源光接入网(WDMPON)的基础上,对WDMPON的生存性机制进行了分析,设计完成了两个具体可行的WDMPON系统保护方案。     

The effect of small additions of Zr, Cr, Mg, Al, and Si on the oxidation of 6∶4 brass

The oxidation behavior of 60%Cu-40%Zn brass having small amounts of Zr, Cr, Mg, Al, and Si was studied between 873 and 1043 K in air. The alloying element of Mg was harmful, while other alloying elements were beneficial to oxidation resistance. Particularly, the simultaneous addition of Al and Si decreased the oxidation rate drastically. During oxidation, Zr formed ZrO₂ Cr formed CuCr₂O₄, Mg formed MgO, Al formed Al₂CuO₄, and Si formed amorphous SiO₂. These oxides were incorporated in the oxide scale composed predominantly of ZnO. The oxide scales formed on all the tested alloys were prone to cracking, wrinkling, and spallation.