气田地层结盐机理试验研究及影响因素分析

含高矿化度地层水气田在开发中后期由于地层压力下降。井筒和地层结盐加剧．严重影响此类气田开发。为研究此类气田地层盐垢的形成条件与机理，室内采用天然岩心与人造岩心模拟了不同压力条件下地层结盐过程。研究发现，随压力变化，地层结盐可分为初始期、平衡期以及加剧期，且越到开发后期。结盐越严重。对产能影响越大；低渗透率地层结盐上限压力低，但结盐对岩心伤害程度大。孔喉尺寸越小，结盐对岩心伤害越大。研究结论与现场动态变化符合。对气井结盐预测和防治具有指导意义。     

新型皮鞋楦帮胶的研制

本文介绍了研制新型皮鞋楦帮胶的目的、意义和原则,提出了最佳配方和工艺控制条件,对影响其质量的诸因素进行了分析。     

水牛磨砂压花摔纹鞋面革生产工艺的探讨

叙述了加工过程中主要工序的实际操作和质量控制要求 ,以及对生产工艺的探讨     

桩挤土效应的极值原理分析方法

根据沉桩时桩周土体的受力及变位特性 ,文章运用了极值原理分别从静力学和考虑速度场两方面出发 ,推导并给出了桩挤土效应的计算公式。同时结合工程实例进行了计算和分析 ,与试验结果进行了比较 ,可满足工程精度     

基于Rough集理论的Self集的构造和演化算法

提出了一种基于Rough集理论的Self集构造和演化算法。利用Rough集约简算法，对用户的安全访问行为的数据作规范化处理并进行约简，从中提取有效的最简规则，降低了安全数据的冗余，减轻了特征码构造的负担。使用Rough集上、下近似集原理，构造了上、下近似Self集，实现了Self的优化和扩展，有效地解决了Self集的自动演化问题。     

滚切式双边剪啃边问题的探讨

介绍了韶钢具有国际先进水平的滚切式双边剪及剪切原理,对剪切时啃边问题进行了探讨,并提出了改进措施,使得啃边板从1998年10月至1999年9月的930块减少到1999年10月至2000年9月的41块.     

The Effect of Size of Testing Samples on Notch Toughness of Structural Steels

We analyze notch toughness assessment of full scale testing samples (FS) form the upper bound toughness of sub-sized (SS) samples of structural carbon-manganese steels. The relations proposed by Schindler (2000) are in good agreement with experimental data. Empirical proportionality constant q* = 0.54 between notch toughness of full scale and sub-sized samples of studied structural steels agrees well with theoretically estimated constant q* = 0.50-0.54. More precise knowledge of the size effect of testing samples on temperature dependence of notch toughness requires an analysis of scatter in experimental data.     

Anisotropic Properties of Bi2Sr2?xLaxCu1O6+δ Thin-Films Grown on Vicinal SrTiO3 Substrates

Epitaxial Bi₂Sr_2–xLa _x Cu₁O₆₊ thin films were grown on vicinal substrates by magnetron sputtering. The growth mode and the superconductivity of the thin films were studied. The films were deposited on 5–7° misoriented (100) SrTiO₃ (STO). The surface of misoriented substrate is tilted to the 111 azimuth. The topographies of the Bi-2201 films show strip-like shapes. The transmission electron microscopy (TEM) study revealed that the films grew with very good in-plane alignments which were comparable to those of single crystals. Both of the temperature dependence of the a- and c-axis resistivities were studied under magnetic fields. The corresponding anisotropic activation energies and upper critical magnetic fields were investigated.     

方形预应力板开方形洞口加固估算公式的推导

通过建立有限元模型进行计算 ,总结出了方形板开方形洞口粘钢加固的估算公式     

An application of ispahan to the typological classification of some Italian upper Paleolithic end-scrapers

In this communication we show some of the results obtained applying the interactive system ispahan to a specific archaeological problem, i.e. the classification of some very characteristic stone tools of the upper Paleolithic: the end-scrapers.Following a general project already presented in the 1980 Symposium “Pattern Recognition in Practice” we have analyzed two samples of end-scrapers: one coming from S.E. Italy (Apulia) and the other from Central Italy (Latium) both approximately dated from 8000 to 9000 years B.C.Being a classification problem, the supervised decision logic of ispahan has not been employed at this stage, but the use of simple t-test, transormations like the principal component analysis and especially some mapping algorithms have proved very useful in our case, even for a possible better choice of the features considered.