基于ODMG—93标准的面向对象视图集成机制

模式集成多数据库系统中需要解决的关键问题之一，己存在的大多数面向多数据库系统都采用了面向对象视图机制来建立集成模式。为了满足基于ＣＯＲＢＡ的ＣＩＭＳ信息集成平台呆订成的需要，本文提出了一种基于数据库管理组ＯＤＭＧ的ＯＤＭＧ－９３标准的视图集成机制并通过一个完整的例子说明了这种视图机制在模式集成中的应用。     

电力配电网单相接地故障选线技术的发展

作为供电系统中的重要部分,电力配电网的重要性毋庸置疑。从实际情况来看单相接地故障是配电网建设与使用过程中经常出现的问题,要求专业人员提高对选线环节的重视,选择应用多种科学的选线方法以从根本上降低单相接地故障的发生风险。本文阐述了常见的几种故障选线方法,并就每一种线型的特性进行了分析。     

High-thermal conductivities of epoxy composites via p-phenylenediamine interfacial modification and process intensification

High loadings of fillers are usually needed to achieve high-thermal conductivity (TC) of polymer-based composites, which inevitably sacrifices processability and meanwhile causes high-cost. Therefore, it is of great significance to achieve high-TC composites under low-filler loading. Here, a novel p-phenylenediamine (PPD) modified expanded graphite (EG-PPD)/epoxy (EP) composite with high TC and low-filler content was successfully prepared via pre-dispersion and vacuum assisted mixing strategy. With the improved interfacial compatibility between EG and EP by PPD, the prepared EG-PPD/EP composite exhibited excellent thermal management performance, resulting in the TC of which reached 4.00 W·m⁻¹·K⁻¹ with only 10 wt% (5.59 vol%) of EG-PPD, which is approximately 19 times higher than that of pure EP. Meantime, the interface thermal resistance of EG-PPD/EP composite between EG-PPD and EP is reduced by 33% compared with EG/EP composite. This composite with excellent TC property is expected to be used in thermal management field.     

Preparation of a hydrophobically enhanced antifouling isotactic polypropylene/silicone dioxide flat‐sheet membrane via thermally induced phase separation for vacuum membrane distillation

Isotactic polypropylene (iPP) hydrophobic flat‐sheet membranes were fabricated for use in vacuum membrane distillation (VMD) through a thermally induced phase‐separation process with dispersing hydrophobically modified SiO₂ nanoparticles in the casting solution to achieve a higher hydrophobicity and to sustain a stable flux in VMD. The contact angle (CA) measurements indicated that the incorporation of nano‐SiO₂ into a casting solution mixture containing 20 wt % iPP had a 20.9% higher CA relative to that of SiO₂‐free membranes. The addition of nano‐SiO₂ also induced morphological changes in the membrane structure, including changes in the pore size distribution, porosity, and suppression of macrovoids. The pore size distribution of the iPP–SiO₂ membranes became narrower compared with that of the SiO₂‐free membranes, and the porosity also improved from 35.45 to 59.75% with SiO₂ addition. The average pore size and maximum pore size of the iPP–SiO₂ membranes both decreased. The ability of the membranes to concentrate an astragalus aqueous solution (a type of traditional Chinese medicine) with VMD was investigated. The surface hydrophobicity and antifouling performance of the iPP–SiO₂ membranes improved with nano‐SiO₂ addition to the membrane casting solution. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42615.     

武钢1号高炉强化冶炼实践

对武钢1号高炉大修开炉以来的操作经验进行了总结.通过采取精料、优化装料制度、调整风口布局、完善高炉操作及加强管理等措施,高炉实现了强化冶炼,同时取得了较好的技术经济指标.     

Effects of Treated Nano-Lanthanum Oxide on the Mechanical and Tribological Properties of PTFE Nanocomposites

The surface of nano-La2O3 was modified. Effects of various amount of treated nano-La2O3 on the mechanical and tribological properties of PTFE were investigated. Mechanisms that contribute to the properties of PTFE composites are also studied. Results indicate that treated nano-La2O3 can increase the mechanical and tribological properties of PTFE simultaneously. With 1wt.% of treated nano-La2O33, the rigidity, tensile strength, notched impact and wear resistance of PTFE nanocomposites were increased by 25.1%,14.1%,20.3% and 36.7% respectively over pure PTFE. The degradation temperature of PTFE was improved by 14℃ by adding only 5% nano-La2O3. The wear resistance reached the highest value when the composite contained 10% treated nano-La2O3, which is about 110 times higher than pure PTFE. Furthermore, treated nano-La2O3 strengthened the bonding between the transfer film and the counterpart surface. A coherent and smooth transfer film on the counterpart surface of PTFE composites can be observed, while pure PTFE can not do.     

吉林省水利水电工程硬基主要地质问题综述

我省大中型水电站及引水隧洞等建筑物多建于岩体内（上），主要工程地质问题有：坝基骨稳定、边坡稳定、围岩稳定和软岩强度问题，以及玄武岩的工程地质问题，本文对此问题做充分论述。     

空气中氚监测仪刻度器

空气中氚监测仪刻度器是参照加拿大 Osborne,R.V.工作研制的实验室专用刻度装置。其鼓泡器是一个φ40×300mm 的铜室,内装150ml 氚水,置于半导体冷阱中,冷阱工作温度在8—12℃之间时,恒温精度在±0.03℃以内。空气流速可高达61/min,鼓出空气中 HTO 的浓度在室温(15—30℃)下可在±3.1%以内预先确定。本文介绍了该刻度器的原理,结构性能及其在国产氘监测仪刻度中的实际应用。     

新疆某复杂低品位氧化铅锌矿选矿工艺

新疆某氧化铅锌矿,原矿含铅0.14%,含锌2.00%,铅氧化率37.86%,锌氧化率为35.42%,矿石铅锌含量低、氧化率较高,属低品位氧化铅锌矿。采用洗矿脱泥的浮选工艺方案,获得铅品位为43.18%、铅回收率为25.04%的铅精矿,锌品位为42.99%、锌回收率为90.3%的氧化锌精矿,实现铅锌资源的有效回收。     

硝酮类化合物环加成反应研究进展

硝酮类化合物是一类非常重要的有机合成中间体,它能够发生很多化学反应,其中最为重要的是加成反应,本文就硝酮类化合物其环加成反应做一简要评价。