基于支持向量机的非概率可靠性分析

针对具有隐式极限状态函数的不确定性结构的非概率可靠性分析,提出一种基于支持向量机回归的不确定性结构非概率可靠性分析方法,并给出了该方法的分析流程.抽取数据样本,优化支持向量机回归参数,使用训练后的支持向量机替代隐式极限状态函数.利用非概率集合理论中的区间分析法,引入尺寸比例因子,构造合适的不确定性结构非概率可靠性指标迭...     

Resilience to traumatic exposure among soldiers deployed in combat.

We examined the influence of positive psychological capital (PsyCap), a metaconstruct that combines established psychological predispositions to be resilient to stress, on the well-being of soldiers during combat deployment. Among U.S. Army personnel deployed in Iraq, cognitive appraisal of stress mediated the effects of trait PsyCap on health symptoms. The indirect effects through appraisal were moderated by levels of exposure to potentially traumatic stimuli. Trait PsyCap covaried more strongly with cognitive appraisals, and had stronger indirect effects through appraisal on health, among soldiers in units with higher levels of potentially traumatic exposures. We discuss implications for research on resilience to trauma in the workplace and for helping workers cope with potentially traumatic exposures. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

顾客需求对服装产品质量的影响

通过对服装制造业各阶段顾客需求、生产方式、产品质量及其管理的分析，指出顾客需求影响服装产品质量观，并推动产品质量的提高，服装企业的质量管理只有以顾客需求为导向，才能最大程度地实现顾客满意。     

隐曲线的线性和旋转插补

基于数控五轴刀具运动分析,提出了旋转插补的概念,给出了旋转插补的相关定义,在此基础上提出了隐曲线的线性和旋转插补原理和方法,并进一步提出了改进的插补方法。     

工业缝纫机模块化设计方法探究

目前,工业缝纫机的发展日新月异,用户的需求也趋向多样化,小批量、多品种已经成为一种需求,传统的设计方法已经不能够满足用户的需求.模块化设计作为工业缝纫机设计的一种全新的方法,将会在未来的设计中起到至关重要的作用.本文对工业缝纫机模块化设计的概念、设计原理、特点进行了论述.     

大型隔膜泵橡胶隔膜的有限元分析

针对隔膜腔的隔膜工作过程,建立简化的二维轴对称结构隔膜有限元模型,对其进行隐式动力学分析,同时建立三维对称结构的隔膜腔及隔膜整体有限元模型,对其进行流固耦合分析,最后针对两种不同的方法和结果展开对比,以此期望得出模拟隔膜运动中应力和位移变化的合理数值模拟方法,以指导隔膜设计。     

A Crank–Nicolson Scheme with ADI to Compute Heat Conduction in Laser Surface Hardening

In this article, a two‐dimensional (2D) numerical model of a Crank–Nicolson scheme with alternating‐direction implicit (ADI) is developed for a heat conduction model in the laser surface hardening process. A numerical solution is compared to the analytical solution and shows a better suitability. Numerical experiment of the repetitive heating is carried out using the present model in order to investigate influences of processing parameters on temperature profiles. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 43(6): 522–541, 2014; Published online 11 November 2013 in Wiley Online Library ( wileyonlinelibrary.com/journal/htj ). DOI 10.1002/htj.21085     

MATLAB在解析几何教学中的应用

深入研究MATLAB软件在解析几何中的应用,讨论了二元隐函数和三元隐函数作图的一般方法。将MATLAB的动画功能应用于解析几何的教学中,使教学形象生动,学生易于理解。研究把不同的图形作于同一坐标系下,学生可对图形的位置关系一目了然,让学生从繁琐的计算中解脱出来。     

Resolution Adaptive Volume Sculpting

We propose a sculpture metaphor based on a multiresolution volumetric representation. It allows the user to model both precise and coarse features while maintaining interactive updates and display rates. The modelled surface is an iso-surface of a scalar field, which is sampled on an adaptive hierarchical grid that dynamically subdivides or undivides itself. Field modifications are transparent to the user: The user feels as if he were directly interacting with the surface via a tool that either adds or removes “material.” Meanwhile, the tool modifies the scalar field around the surface, its size and shape automatically guiding the underlying grid subdivision. In order to give an interactive feedback whatever the tool's size, tools are applied in an adaptive way, the grid being always updated from coarse to fine levels. This maintains interactive rates even for large tool sizes. It also enables the user to continuously apply a tool, with an immediate coarse-scale feedback of the multiple actions being provided. A dynamic level-of-detail (LOD) mechanism ensures that the iso-surface is displayed at interactive rates regardeless of the zoom value; surface elements, generated and stored at each level of resolution, are displayed depending on their size on the screen. The system may switch to a coarser surface display during user actions, thus always ensuring interactive visual feedback. Two applications illustrate the use of this system: First, complex shapes with both coarse and fine features can be sculpted from scratch. Second, we show that the system can be used to edit models that have been converted from a mesh representation.     

水库水电站中长期隐随机优化调度综述

随着中国水电开发积极有序推进,大型梯级水电格局逐渐形成,对水电站群的实际调度运行提出了一系列新的需求和挑战。文中概述了水库水电站确定性优化调度理论的发展历程和2种随机优化理论思想,在阐述隐随机优化调度原理的基础上,对目前国内外常用的隐随机调度决策与自变量因子进行了归纳分析。重点介绍了多元线性回归法、智能算法、贝叶斯网络法和模糊集方法这4类调度规则制定方法,并分别对各方法的优缺点进行了总结评价。最后,提出水库水电站隐随机优化调度研究的几点展望,为进一步提高水库水电站实际调度水平提供技术支撑。