ON STOCHASTIC CONVERGENCE THEOREMS FOR THE FUZZY C-MEANS CLUSTERING PROCEDURE∗

The fuzzy c-means clustering algorithm has been well studied for equal weight distributions on a finite set. Suppose that this situation is generalized to an arbitrary probability distribution on a finite dimensional Euclidean space, assuming that the second moment of the distribution is finite. Now choose ever larger finite random samples from this distribution and compute the standard optimal membership functions for a fuzzy partition into c clusters. Then the convergence of the cluster center points is established in the Hausdorff sense with probability one, provided that there is a unique optimal center point set. These optimal center points are the fixed point of a simple operator, and there is a corresponding iterative algorithm that generalizes the usual procedure.     

GFC-32型固定沸腾床使用情况总结

简述了GFC-32型固定沸腾床的特点和良好的使用效果，同时提出改进设想，以便更好地在制盐行业上发挥作用。     

STEAM DRYLNG OF WOOD FUELS

ABSTRACT

The objective of this work is to investigate some of the important aspects in the design of a steam band dryer for wood fuels. For this purpose the drying of the material in a bench-scale fixed bed dryer has been studied.

Drying times and thermal efficiencies for experiments conducted under different conditions are compared. The investigated materials are soft-and hardwood chips and softwood bark.

The thermal efficiency, the part of the sensible heat which is used during one passage of the steam through the bed, increases with increasing mass load (mass of dry matter per unit area) and with decreasing steam mass flux. At a mass load of 30 kg/m the thermal efficiency is about 0.85 even at steam mass fluxes as high as 0.6 kg/m² s (1.2 m/s). The thermal efficiency proves to be almost independent of pressure and temperature of the steam.

Due to the very inhomogeneous materials the steam mass flow distribution was uneven. This causes a decreased thermal efficiency. When bark     

浅议标底包死合同在工程结算中应注意的问题

施工合同价款是支付承包方按合同要求完成工程内容的价款总额，介绍了在施工中会引起工程总造价增加常遇到的几个问题，指出参与者要提高业务素质，增强投资控制观念。     

U.v. irradiation-induced crosslinking of solid poly(ethylene oxide) modified with tetraalkyl ammonium salt

Crosslinked poly(ethylene oxide) (PEO) modified with a quaternary tetraalkyl ammonium salt, ethyl methacrylate dimethyldodecylammonium bromide, was prepared by exposure of the solid blend to ultraviolet radiation from a high-pressure 150 W mercury lamp. The photochemical crosslinking of the blends proceeded in the presence of benzophenone as a hydrogen-abstracting agent. Gel fraction yield exceeded 85%, equilibrium swelling in water varied from 3.0 to 5.0, and the equilibrium swelling in chloroform from 6.5 to 12.5. The networks obtained have been characterized by elemental analysis, i.r.,¹H n.m.r., and d.s.c. measurements and their microstructure, water absorption and equilibrium swelling have been discussed.     

带有非局部条件发展包含的可控性

研究带有非局部条件发展包含的可控性,在多值函数F(t,x)取凸情形时将所讨论的问题转化为集值积分算子的不动点问题,利用凝聚映射不动点定理给出发展包含可控性的充分条件.     

不等式约束二次规划的不动点迭代

提出了不等式约束二次规划问题的一个光滑型方法。通过分析最优解满足一线性互补问题这一特征，利用信息论中的极大熵原理求解并获得了基于不动点的光滑迭代算法。分析了解存在的必要条件及迭代算法收敛性，给出了算法的迭代格式，通过数值模拟证明该算法的有效性，从而为不等式约束二次规划问题的求解提供了新途径。     

有效配置人力资源推动企业高效发展

作为一个老矿山,在竞争日益激烈的市场面前,面临的困难是多方面的,其中人力资源配置问题尤为突出。着眼于未来的发展,企业需要合理利用人力,充分发挥人在企业中的主导地位,实现“人、岗、事”之间的合理安排,推动企业高效发展。     

确定管板限定圆最大布管数的新方法

采用迭加的方法,使用Ｃ语言编程在微机上实现管板布管限定圆最大布管数的确定．该方法可根据中心布管数是奇排列还是偶排列来确定最大布管数,简便易行,计算速度快,对换热器的设计及工艺计算具有实用价值．     

单调自映射不动点的存在性及不动点处的连续性

讨论了单调自映射的不动点存在性,给出了不动点存在性和唯一性的条件,并讨论了在不动点处自映射的连续性。证法具有一般性,可推广到一般的凸集上。