东朗水电站坝型方案比选

本文根据东朗水电站坝址地形地质条件及工程区料场料源状况,选取混凝土面板堆石坝、沥青混凝土心墙堆石坝和碾压混凝土重力坝三种坝型进行比选,最终选择混凝土面板堆石坝。     

焦家金矿矿体形态的变化对运输系统的影响

通过对焦家金矿主矿体形态及位置的探采对比，指出导致中段主沿脉运输巷道向矿体下盘移动的原因，得出了深部中段设计时，主沿脉运输巷距主参考面——主断层面的最小距离为１１０ｍ的统计参考值。     

Coke deposition mechanism on the pores of a commercial Pt-Re/γ-Al2O3 naphtha reforming catalyst

Coke deposition mechanism on a commercial Pt-Re/γ-Al₂O₃ naphtha reforming catalyst was studied. A used catalyst that was in industrial reforming operation for 28 months, as well as the fresh catalyst of the unit were characterized using XRD, XRF, and nitrogen adsorption/desorption analyses. Carbon and sulfur contents of the fresh and the used catalysts were determined using Leco combustion analyzer. The pore size distributions (PSD) of the fresh and the used reforming catalysts were determined using BJH and Comparison Plot methods. The Comparison Plot method produced the most reasonable PSDs for the catalysts. Through comparison of the PSDs of the fresh and the used catalysts, it was revealed that coke deposited on both micropores and mesopores of the catalyst at a constant thickness of 1.0 nm. The constant coke thickness on the catalyst pore walls in the naphtha reforming process (temp. ∼ 500 °C) implies that coke deposition reaction is the slow controlling step in comparison to the fast mass transfer rate of coke ingredients into the pores. The bulk density of the deposited coke on the used catalyst was calculated as 0.966 g/cm³.     

各种形状的两叶圆弧型转子罗茨鼓风机的比较

罗茨鼓风机圆弧型转子有三种不同的型线组合。本文给出两叶罗茨鼓风机这三种不同的圆弧型转子型线的设计方程，并指出它们的优缺点及应用范围。     

Intercomparison of the Realizations of the ITS-90 from 83.8058 K to 692.677 K among European NMIs

The EUROMET.T-K3 comparison is the regional extension of CCT-K3. The comparison involved the six European national metrology institutes (NMIs) previously involved in CCT-K3 (LNE-INM/CNAM, SMU, INRiM, NMi-VSL, NPL, PTB) and 18 additional European national laboratories. The comparison was divided into five different loops, each coordinated by a co-pilot chosen from the laboratories having participated in the CCT-K3 comparison. LNE-INM/CNAM played the role of pilot in linking the five loops. In each loop, an artifact in the form of a standard platinum resistance thermometer (SPRT, 25 Ω) was circulated among the participating laboratories. To have sufficient information about the possible drift of the SPRTs, the co-pilots performed a calibration over the full temperature range at the beginning and at the end of the loop. A EUROMET reference value (ERV), taking into account the whole comparison, was defined, and the differences (T _Lab − T _ERV) were calculated with the associated uncertainties. The method for establishing the link between the participants in CCT-K3 and in EUROMET.T-K3 is described. Institut National de Métrologie (BNM-INM/CNAM at the time of the comparison, LNE-INM/CNAM since 1 January 2005), Paris, France.     

滑动水口综述

介绍了滑动水口的起源和发展概况,阐述了滑动水口工作原理、水口结构形式及配套机构组成.滑动水口种类很多,分类方式也不同.国内使用的水口系列产品,大多是由国外引进消化而来,也有些是自行设计的.但国内外水口产品还存在着一些区别,直接影响水口国产化进程,这需要做更多的工作,来发展国内水口系列.     

A comparison of several reanalysis methods for structural layout modifications with added degrees of freedom

The goal of this paper is to compare several reanalysis methods for structural layout modifications with added degrees of freedom. These methods include the modified initial analysis methods, the modified initial analyses method with a scalar multiplier, and the preconditioned conjugate gradient method. These reanalysis methods are compared in terms of condition numbers of the preconditioned system and their computational accuracy. It is concluded in this paper that the preconditioner of the first method is not positive definite in general, while for the second method a positive definite preconditioner for a small scalar multiplier can be obtained, but the condition number of the preconditioned system is still large. For the third method, the condition numbers of the preconditioned system are significantly reduced, and highly accurate approximate solutions can be obtained in a few iterations.     

川西民居与徽州民居街巷空间比较研究

该文选取四川省峨眉山市罗目古镇与安徽省黄山市郭村作为研究对象,基于测绘数据对民居街巷空间进行比较分析,川西民居街巷空间注重内外空间的渗透,尺度亲切,形成活跃的商业氛围。徽州民居街巷空间与水系结合紧密,街巷界面相对封闭,与其居住功能相适应,整体空间静谧单纯。两者特点的形成并非早期移民文化对当地文化单向的冲击,而是在自然环境、生产生活方式、审美品味与社会伦理等地域性因素影响下,与本土文化有机融合的结果。     

降低业务平台TCO的解决方案

从介绍业务平台的现状和总体拥有成本（TCO）的组成入手,分析了现网TCO,给出了ZTEiVAS平台解决方案,最后对ZTEiVAS平台与传统业务平台进行了对比。     

迪朗和他的类型学

该文旨在阐述迪朗的类型学,及他重新构建建筑学科知识体系的重要方法。