Common fixed points of a countable family of multivalued quasi-nonexpansive mappings in uniformly convex Banach spaces

In this paper, we introduce a one-step iterative scheme for finding a common fixed point of a countable family of multivalued quasi-nonexpansive mappings in a real uniformly convex Banach space. We establish weak and strong convergence theorems of the proposed iterative scheme under some control conditions.     

Function evaluation with feedforward neural networks

Much effort has previously been spent in investigating the decision making/object identification capabilities of feedforward neural networks. In the present work we examine the less frequently investigated abilities of such networks to implement computationally useful operations in arithmetic and function evaluation. The approach taken is to employ standard training methods, such as backpropagation, to teach simple three-level networks to perform selected operations ranging from one-to-one mappings to many-to-many mappings. Examples considered cover a wide range, such as performing reciprocal arithmetic on real valued inputs, implementing particle identifier functions for identification of nuclear isotopes in scattering experiments, and locating the coordinates of a charged particle moving on a surface. All mappings are required to interpolate and extrapolate from a small sample of taught exemplars to the general continuous domain of possible inputs. A unifying principle is proposed that looks upon all such function constructions as expansions in terms of basis functions, each of which is associated with a hidden node and is parameterized by such techniques as gradient descent methods.     

TLM modeling of a probe‐coupled cylindrical cavity based on compact wire model in the cylindrical mesh

This article describes an implementation of a compact wire model into the three‐dimensional transmission‐line matrix (TLM) cylindrical mesh for the purpose of an efficient analysis of probe‐coupled cylindrical microwave cavity devices. Because of a cylindrical grid structure and empirical nature of the compact model, this implementation has to take into account a change of wire model parameters with a variable cross section of the TLM nodes through which a wire conductor passes. The model accuracy has been experimentally verified and compared with the corresponding results reached by the TLM method based on a rectangular grid in order to consider its advantages. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2012.     

充填综采矸石-粉煤灰压实变形特性试验研究及应用

为了掌握矸石-粉煤灰充填开采中充填体的变形特性,采用MTS 815.02电液伺服岩石力学试验系统及自行设计的压实装置,通过一系列压实特性试验,比较分析了矸石-粉煤灰充填材料压实过程中的变形特征,研究了矸石-粉煤灰充填材料的基本变形规律,将其变形过程分为3个基本阶段,得出了矸石与粉煤灰充填体的最佳配比为1:0.3,并提出...     

关于土的压实系数的探析

对压实系数的概念展开了分析,并对目前压实系数存在的误区进行了研究,同时针对如何使压实系数达到施工压实标准提出了解决办法,从而使压实系数满足规范要求,保证土体回填质量。     

基于模糊最大散度差判别准则的自适应特征提取模糊聚类算法

指出皋军等人提出的基于模糊最大散度差判别准则(Fuzzy Maximum Scatter Difference Discriminant Criterion,FMSDC)的聚类算法(Fuzzy Maximum Scatter Difference Diseriminant Criterion Based Cluster...     

结构紧凑的弹簧配重系统

探讨了弹簧配重系统的基本形式及其一种变形形式,并从理论上分析了弹簧配重系统的工作原理,得出弹簧的弹性系数与螺旋线参数之间的关系。同时列举了一种使用实例,从实例中可以看出,弹簧配重系统与采用配重块的方法配重相比,弹簧配重系统的结构更为紧凑,更适用于小型且结构要求紧凑的机械设备。     

304不锈钢紧凑拉伸裂尖应力强度因子有限元分析

304不锈钢结构在工程应用中经常发生疲劳断裂.利用有限元数值模拟方法对304不锈钢制成的紧凑拉伸试样进行二维分析,通过J积分计算应力强度因子.使问题满足平面应力条件,通过对数据处理,分析载荷大小和裂纹长度对应力强度因子的影响.把有限元计算的结果和经验公式对比,分析误差及有限元方法的可行性.     

一种小型化八频段可重构手机天线设计

提出了一种新型频率可重构的手机天线,尺寸为43 mm×9 mm×3 mm.该天线由曲折馈电枝节、耦合枝节,以及多路射频开关(RF-Switch)组成.通过RF-Switch接入不同的电感改变天线的感抗值和带线的有效电长度,在低频段得到了四种不同的工作状态,天线的低频带宽显著增加.研究结果表明:所设计天线能够很好地覆盖长期演进(Long Term Evolution,LTE)、无线广域网(Wireless Wide Area Network,WWAN)八个频带且频段内回波损耗小于一6 dB.实测表明天线具有良好的辐射效率和辐射增益,能够实现全向覆盖,具有很好的应用前景.