基于时间近邻拉氏正则的多工况软测量回归

针对流程工业中,工况改变导致传统软测量模型预测精度下降的问题,考虑到工业数据连续性、序列性、多重共线性、数 据量庞大等特殊性对模型建立的影响,提出一种基于时间近邻拉普拉斯正则的多工况软测量回归模型框架。 针对工业数据的 多重共线性,回归框架采用非线性迭代偏最小二乘方法,同时引入域适应正则项改善工况变化对模型的影响,在此基础上,提出 时间近邻拉普拉斯正则项,能够在映射过程中保持住数据的序列结构,并且大幅度减少模型训练时间以满足工业实时性要求。 实验部分以三聚氰胺聚合过程多工况数据集为例,对本文模型的预测有效性以及减少训练时间的有效性进行了实验和分析。 结果表明,与传统方法偏最小二乘回归相比,当目标工况为工况 1 到工况 4 时,本文方法使平均均方根误差分别降低了 30. 3% 、 31. 4% 、29. 3% 和 24. 1% 。 且相较于传统全连接法,时间近邻法构建拉普拉斯正则项能够使得四个工况上模型训练时间分别降 低 14. 11、 1. 01、 26. 43 和 0. 71 s,表明该模型的预测准确性和训练时间均得到有效改善.     

φ8mm钨球破片速度预测不确定度的评定方法

介绍了破片速度衰减规律模型的建立方法,阐明了破片速度预测不确定度的研究意义,探讨了影响破片速度预测不确定度的主要因素,根据破片速度衰减规律试验数据得到了破片速度预估的经验公式.建立了破片速度预测不确定度评定模型,分别探讨了各不确定度分量的计算方法.φ8 mm钨球破片试验验证了破片速度预测经验公式的准确性,并给出了其预测不确定度的计算公式.     

On generalized logistic equations with a non-homogeneous differential operator

We consider a generalized logistic equation of superdiffusive type, driven by a non-homogeneous nonlinear differential operator, which incorporates the p-Laplacian, the (p, q)-differential operator and the generalized p-mean curvature differential operator. Using variational methods coupled with truncation and comparison techniques, we prove a bifurcation-type theorem describing the dependence of positive solutions on the parameter λ > 0.     

弱胶结地层条件下垮落带岩层破碎冒落特征与压实变形规律试验研究

采空区顶板岩层的破碎、冒落、压实、类固结等性能是影响垮落带高度变化的重要因素。通过破碎岩石压缩实验和岩石崩解实验,研究了不同类型岩石的破碎、崩解性能,分析了岩石膨胀变形—破碎冒落—充填压实—蠕变固结的变形过程及特征,揭示了我国东部和西部矿区岩石变形破坏的差异性。研究结果表明:弱胶结岩石具有强碎胀、易崩解的特性,西部弱胶结岩石较中东部岩石更易破碎,耐崩解指数较中东部岩石偏小,岩石耐崩解指数随崩解循环次数增加呈线性递减关系;相同采高条件下,西部弱胶结地层工作面初始垮落带高度较中东部岩层工作面小,弱胶结地层工作面垮落带趋于稳定后垮落带高度的变化量大,弱胶结岩石的胶结性越差这种特性越强。相似模拟试验结果证明了理论分析的可靠性。     

A simple example of an indirect estimator with discontinuous limit theory in the MA(1) model

Indirect estimators usually emerge from two‐step optimization procedures. Each step in such a procedure may induce complexities in the asymptotic theory of the estimator. In this note, we are occupied with a simple example in which the estimator defined by the inversion of the binding function has a ‘discontinuous’ limit theory even in cases where the auxiliary one does not. This example lives in the framework of estimation of the MA (1) parameter. The ‘discontinuities’ involve the dependence of the rate of convergence on the parameter, the non‐continuity of the limit distribution w.r.t. the parameter and the estimator's non‐regularity. We are also occupied with a more complex example where the discontinuities occur because of complexities induced in any step of the defining procedure. We present some Monte Carlo evidence on the quality of the approximations from the limit distributions. Copyright © 2014 Wiley Publishing Ltd     

长江口水域砂矿资源及其合理开发利用

长江河口地区水下砂体发育形成了良好的砂矿资源,具有开发利用前景.分析砂矿资源的分布特点、沉积规律与物质组成,探讨合理利用的途径及其开发过程中须注意的环境地质问题.水域砂矿资源可为长江口岸带经济圈的基础建设与土地增殖提供重要物质来源.     

3—THE FINITE-DEFORMATION THEORY OF PLAIN-WEAVE FABRICS PART I: THE BIAXIAL-DEFORMATION THEORY

Theories of the biaxial tensile properties, the uniaxial tensile properties, and the shear-deformation properties of plain-weave fabrics are presented in a general form, a simplified stereo-model of the structure of plain-weave fabrics being used throughout these theories.

In the first part of this series, the biaxial tensile-deformation theory is presented with the aid of the model, and the forces required to stretch the fabric along the warp and weft directions at the same time are theoretically calculated from the properties of yarns and from the structure of the fabrics. In this biaxial theory, both warp and weft yarns are assumed to be perfectly flexible, and the forces caused by yarn-bending are ignored. The compressibility of the yarn under the action of a lateral compressive force is also introduced into the theory, and it is shown that the compressive properties of yarns have a great influence on the tensile properties of the fabrics.     

平煤集团十矿己15—22210工作面瓦斯涌出规律

通过对工作面瓦斯涌出参数的测定，得出了工作面瓦斯涌出规律。为相似工作面瓦斯治理提供了参考数据。     

云南省金平县亚拉寨铜镍矿区煌斑岩脉分布特征及其与矿体的关系

金平县亚拉寨铜镍矿区经历多种岩浆岩频繁侵入，尤其是煌斑岩脉，在矿体中及近矿围岩中较发育，侵入穿插，对矿体的切割破坏作用十分明显，不仅极大地破坏了矿体的连续性和完整性，而且同时由于此种脉岩一般与矿体斜交，对矿体的开采带来很大的困难。因此，了解和掌握其分布规律，讨论和研究脉岩的特征，掌握脉岩与矿体的关系，具有重要的意义。     

Recursive estimation of quantitles using recursive kernel density estimators

Recursive estimation of quantiles may be obained via adaptive stochastic approximation

approximation theorms can be used to obtained the asympotic properties when the obervation are independent. for dependent sequences matingale theory cannot be applied straight forwardly as the tool for asympototic analysis.In this paper we consider both the case when the observation are i.i.d. and when they form a stationary and strongly regular process.the main result is sufficient condition for almost sure convergence in the strongly regular case.