采矿方法选择的灰色关联分析法

本文将灰色系统理论中的灰色关联分析法应用于地下采矿方法的选择,提出了采矿方法方案优劣评判的灰色关联分析法。     

人为因素对矿山安全影响关系的灰色关联分析

基于灰色系统理论,建立了以安全综合评价得分为参考数列,以5种不同人为因素得分为比较数列的灰色关联分析体系。通过对构造的不同数据列的无量纲化处理,求取差序列,计算灰色关联系数,得到了不同人为因素对矿山安全影响的灰色关联度。结果表明,矿山职工素质和违反规程对各矿井安全影响最明显,为矿山企业管理者加强安全管理提供了理论和技术支持。     

四川省固定资产投资结构与产业结构的灰色关联分析

以灰色系统理论为基础,系统研究了四川省固定资产投资与三次产业,国内生产总值与各产业固定资产投资之间的关联度,并给出了相应的解释和政策建议.     

灰色关联分析在预裂爆破震动分析中的应用

引入灰色系统理论的关联分析方法，对某矿山预裂爆破的震动效应进行了多因素灰色关联分析。     

金属材料大气腐蚀与环境因素的灰色关联分析

应用灰色系统理论分析碳钢及低合金钢、不锈钢、铝及铝合金、铜及铜合金和特级纯锌等金属材料大气腐蚀与大气环境因素的灰色关联,从而确定各环境因素对这几类金属材料的大气腐蚀的影响程度,并评价了灰色关联分析方法的有效性     

德兴铜矿北山露天采场运输公路路基稳定性因素的灰色关联分析

本文使用灰色系统理论，对德兴铜矿北山露天采场不同材料公路路基稳定性进行了多因素关联分析研究，不但考虑构成路基介质的力学性质，而且考虑边坡结构和地下水的影响，为诸多因素对边坡稳定性系数影响的程度排序，为工程设计提供科学依据．     

郑州东区土层剪切波速影响因素的灰色关联分析

利用灰色关联分析法对郑州东区影响土层剪切波速的土层深度、物理性质指标进行了灰色关联度计算，获得了该区土层剪切波速诸多影响因素的灰色关联序，认为密度的影响最大，含水率的影响最小。     

利用关联分析方法寻找采掘关系控制的着力点

利用灰色系统理论中的关联分析方法寻找控制采掘比的着力点。实例表明，通过调整采掘力量，可达优化采掘关系之目的。     

应用灰色关联分析优选采矿方法

本文介绍了灰色关联分析的基本原理及其用于优选采矿方法的五个步骤．引用实例验。了该方法的可靠性、为相互交错的多个评价目标的方案决策，提供了一个简单、明晰的可行方法。     

A Generalized Continuum Theory and Its Relation to Micromorphic Theory

Classic continuum mechanics views a crystal as a homogeneous and continuous medium, in which the basic structural unit of the crystal is taken without structure and is idealized as point mass. Micromorphic theory views a material as a continuous collection of deformable point particles; each particle has finite size and additional nine internal degrees of freedom describing the stretches and rotations of the particle. This paper presents a multiscale field theory that views a crystalline material as a continuous collection of lattice points, while embedded within each point is a group of discrete atoms. The atomistic formulation of the field theory is briefly introduced. Its relation with the well-known micromorphic theory is derived. The applicability of the classical continuum theory, micromorphic theory, and the generalized continuum field theory is discussed.     

灰色关联分析法在地质取样中应用探讨

本文探讨了应用灰色关联分析法指导矿山地质取样工作的可行性。阐述了其基本原理和算法。     

煤焦显微结构特征与焦炭性质的关系

通过分析13种不同变质程度的单种煤的煤岩性质以及对应的40kg试验焦炉所炼焦炭的性质,结果表明:焦炭光学组织指数(OTI)与单种煤镜质组平均最大反射率存在正相关线性关系;通过多元线性回归分析,确定了镜质组反射率分布和焦炭光学组织组成的定量关系;同时也总结了焦炭抗碎强度M<,40>和反应性CRI与焦炭光学组织组成的关系:...     

Vertical and Radial Consolidation Analysis of Multilayered Soil Using the Spectral Method

A new, easy to implement, solution to the consolidation of multilayered soil based on the spectral method is presented. Combined vertical and radial drainage under instantaneous or single ramp loading is considered, ignoring well resistance. Flow in the vertical direction is based on the average hydraulic gradient at a particular depth which allows smear effects to be included. The excess pore-water pressure profile across all soil layers is described by a single expression calculated with common matrix operations. Average excess pore pressures within or across any number of layers are easily calculated from the single expression. The new model is verified against other solutions from the current literature indicating that the more general spectral method model can replace the separate solutions developed for specific problems.     

Unsaturated Soil Seepage Analysis Using a Rational Transformation Method with Under-Relaxation

The finite-element method provides a convenient and effective means for solving problems of seepage in unsaturated soils. However, convergence difficulties exist in numerical simulations of unsaturated flow analyses because of the high nonlinearity of the soil hydraulic properties. This technical note presents a combination approach consisting of a rational function transformation method and a common under-relaxation technique to solve the h-based form of Richards equation. Numerical studies show that this combined method can use a larger time step and corresponding oscillation-free mesh size to produce acceptable results and also converge to a stable solution quickly in each time step.     

基于粗集理论的大曲理化指标对白酒质量和产量影响的重要因素分析

运用粗集理论方法对采集到的大曲参数(各理化指标)和用其酿造的白酒质量与产量数据进行了分析,通过对数据进行等间隔离散化处理,得到大曲理化指标与白酒质量和产量的决策表,并用属性重要性方法对决策表进行属性约简,得到了大曲理化指标中影响白酒质量和产量的重要因素.     

A Numerical Method for Microstructure Generation of a Binary Aluminum Alloy and Study of Its Mechanical Properties Using the Finite Element Method

A numerical method for the generation of the microstructure of a binary aluminum copper alloy is presented. This method is based on the repeated addition of some basic grain shapes into a representative volume element. Depending of the orientation of adjacent grains, different type of grain boundaries can be formed. The primary and secondary phases are distinguishable in our model and have distinct properties, reflecting the heterogeneous nature of the microstructure. The digital microstructure was then transformed into a finite element model. Using the finite element software ABAQUS, the stress distribution inside our heterogeneous material model has been studied and its mechanical properties have been found. That also makes possible to study and to visualize the cracks generated during the loading of the material where the local stress was sufficiently high. As a result of these analyses, the elastic modulus of such a heterogeneous domain and the effect of crack formation on ductility were evaluated.     

演化增长理论与内生增长理论的差异分析

内生增长理论和演化增长理论都是为解决新古典增长理论在解释技术进步方面的缺陷而发展起来的,但内生增长理论仍然是在新古典的框架内对新古典增长理论的修补和完善,而演化增长理论却是对新古典分析方法的否定和变革,它和内生增长理论在前提假设、变量处理、方法论等方面存在本质的区别.     

Analysis of Soil Disturbance Associated with Mandrel-Driven Prefabricated Vertical Drains Using an Elliptical Cavity Expansion Theory

The installation of mandrel-driven prefabricated vertical drains and resulting disturbance of soft saturated clays are analyzed with a new elliptical cavity expansion theory. This formulated theory accounts for a concentric progression of elliptical cavities in an undrained condition and the large-strain effects in the plastic zone incorporating the modified Cam clay parameters. The total and effective stresses and excess pore water pressure in the soils surrounding the mandrel are predicted taking into account the mandrel installation rate, mandrel dimensions and the time factor. The theoretical variation of excess pore pressure is then compared with the results of large-scale consolidometer tests, which show that the estimated and measured pore pressures are almost the same. The plastic shear strain normalized by the rigidity index is then used to identify the zone of disturbance around the vertical drains. This formulation has been applied to a case history from the Muar clay region in Malaysia, and the results verify the usefulness of the method for determining the extent of the smear zone.     

Comparison of Ordinary Kriging, Regression Kriging, and Cokriging Techniques to Estimate Soil Salinity Using LANDSAT Images

The objectives of this study are: (1) to evaluate the LANDSAT best band combinations to estimate soil salinity with different crop types; (2) to compare ordinary kriging, regression kriging, and cokriging techniques to generate accurate soil salinity maps when applied to LANDSAT images; and (3) to compare the performance of different crop types: alfalfa, cantaloupe, corn, and wheat as indicators of soil salinity. This study was conducted in an area in the southern part of the Arkansas River Basin in Colorado. Six LANDSAT images acquired during the years: 2000, 2001, 2003, 2004, 2005, and 2006 in conjunction with field data were used to estimate soil salinity in the study area. The optimal subsets of band combinations from the LANDSAT images that correlate best with the soil salinity data sets were selected. Ordinary kriging, regression kriging, and cokriging were applied to 2,914 soil salinity data points collected in alfalfa, cantaloupe, corn, and wheat fields in conjunction with the selected LANDSAT image band combination subsets. Ordinary least-squares (OLSs) were used to regress the correlated band combinations to generate a soil salinity surface. The residuals of the OLS multiple regression model were kriged and combined with the soil salinity surface generated using the OLS multiple regression model to produce the final soil salinity surface of the regression kriging model. The same LANDSAT band combinations used with the regression kriging technique were used as secondary data variables with the cokriging technique, while the soil salinity data was used as a primary variable. The results show that the best band combinations for estimating soil salinity with different crops are as follows: alfalfa [red, near infrared, and normalized difference vegetation index (NDVI)]; cantaloupe (blue and green); corn (near, thermal, and NDVI); and wheat (blue and thermal). The performance of the different geostatistical models used in this study is: (1) ordinary kriging; (2) regression kriging; and (3) cokriging. Estimation of soil salinity works best for corn, then wheat, cantaloupe, and alfalfa.