规划建筑漫游动画的计算机实现

利用计算机三维技术建立虚拟城市是很重要的城市规划内容,使用3ds max软件将二维图纸中的设计转化为虚拟的数字化建筑,将产生实体沙盘模型所达不到的仿真空间效果.能够全方位地、直观地给人们提供有关城市的各种具有真实感的场景信息.     

基于三维实体造型技术的机械制图教学体系的思考

针对三维实体设计的特点,分析机械制图课程学习三维实体造型技术的必要性及三维实体造型技术对机械制图教学的影响,指出应以三维实体造型技术构建全新的机械制图课程教学体系.     

“三软”煤层炮采放顶煤工作面矿压规律研究

通过对红旗井中厚煤层炮采放顶煤工作面矿压观测分析,得出“三软”中厚煤层炮采放顶煤工作面的矿压显现特征,综合评价其支架的适应性与工作状态,为工作面支架选型提供依据,对同类条件下放顶煤工作面开采具有指导意义.     

Analysis and evaluation of effects of processing steps on dimensional tolerance of PIM parts

The factors affecting the dimensional tolerance of powder injection molding (PIM), such as the selection of the powder and binder, the feedstock homogeneity, the feedstock thermal properties, the feedstock rheologic behavior, the debinding schedule and atmosphere and sintering temperature gradient were discussed. An attempt was made to develop a model to estimate the influence of important variables. The results show that a better understanding of these factors can provide some useful theoretical instructions for large scale production.     

Diagnostic categories or dimensions? A question for the Diagnostic and statistical manual of mental disorders--fifth edition.

The question of whether mental disorders are discrete clinical conditions or arbitrary distinctions along dimensions of functioning is a long-standing issue, but its importance is escalating with the growing recognition of the frustrations and limitations engendered by the categorical model. The authors provide an overview of some of the dilemmas of the categorical model, followed by a discussion of research that addresses whether mental disorders are accurately or optimally classified categorically or dimensionally. The authors' intention is to document the importance of this issue and to suggest that future editions of the Diagnostic and Statistical Manual of Mental Disorders give more recognition to dimensional models of classification. They conclude with a dimensional mental disorder classification that they suggest provides a useful model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Category Representation for Classification and Feature Inference.

This research's purpose was to contrast the representations resulting from learning of the same categories by either classifying instances or inferring instance features. Prior inference learning research, particularly T. Yamauchi and A. B. Markman (1998), has suggested that feature inference learning fosters prototype representation, whereas classification learning encourages exemplar representation. Experiment 1 supported this hypothesis. Averaged and individual participant data from transfer after inference training were better fit by a prototype than by an exemplar model. However, Experiment 2, with contrasting inference learning conditions, indicated that the prototype model was mimicking a set of label-based bidirectional rules, as determined by the inference learning task demands in Experiment 1. Only the set of rules model accounted for all the inference learning conditions in these experiments. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

关于国标中剖视图内容不断完善的分析与建议

运用逻辑学关于“划分”、“概念间的关系”和“下定义”的有关原理,分析了近30年中国家标准中关于剖视图分类演变的进程,对剖视图的分类趋向科学性予以肯定,指出近代国标中关于剖视图分类存在的问题。在此基础上,阐明符合逻辑学的剖视图定义结构,并对剖视图标注中剖切符号的图示提出了改进建议。使得各类剖视图的定义更确切、科学,表达更方便、明了,绘图更容易。     

基于非线性判别分析的故障分类方法研究

针对复杂机械故障的模式分类问题,提出一种基于非线性判别的多故障分类方法。与线性判别分析相比,基于核的判别分析更适于处理线性不可分的分类问题。分析了基于核的判别分析方法与核函数主元分析方法之间的联系与差异,指出了两者不同的应用背景,核函数主元分析适于检测机械设备异常状态的出现,而基于核的判别分析则适于在积累历史故障征兆基础上对多种机械故障进行分类识别。将上述方法应用于风机工作状态的分类识别与齿轮故障模式分类,结果表明该方法对于多种复杂的故障模式分类具有出色表现。     

开采引起地表沉陷规律的有限元分析

地表移动规律是采矿领域的重要研究内容。开采必将对覆岩、地表以及地表附属物造成影响,地表移动规律是反映影响程度的尺度。本文通过有限元分析计算得出哈拉钩矿开采后地表下状况,为研究该矿区地表移动规律提供定量的依据。     

有色金属矿山磨矿自动控制的探讨

阐述了矿山选矿自动控制技术要求及特点,并对选矿控制方案进行探讨。