智能量仪的发展动向和对策

文章分析了国内外量仪发展的趋势,指出创新量仪传感器和提高测量系统智能化是智能量仪发展的两个动向,提出发展PCI、SCI、ASIC和RFM做为振兴我国智能量仪的对策。     

基于关联维数的发动机转子振动故障模式判别

通过模拟双转子航空发动机的几种典型振动故障模式，根据计算分析验证了借助于关联维数辨别不同故障模式方法的可行性，并将分形方法应用于实测的涡扇发动机转子振动信号分析之中。初步分析结果表明，由于不同故障形式的动力学形成机制不同，振动信号在相空间具有不同的特性，通常也具有不同的关联维数。     

三维数字地形图生成技术研究

在论述三维真实感数字地形图生成算法的基础上,结合数字高程模型(DTM)数据,用OpenGL在计算机上实现三维数字地形图的显示。     

巴拉克·奥巴马胜选演说翻译的生态学视角

从生态学视角研究翻译的整合性。基于翻译适应选择论,分别从语言维、文化维和交际维分析奥巴马胜选演说三个中译本的适应性选择转换情况,指出应注重体现翻译生态系统的整体性,注意语言维、文化维和交际维等多维度的有机结合。在翻译过程中力求做出与翻译生态环境相适应的选择,达到兼顾原文原语、译语和译语读者之间平衡和协调的目的。     

引用形定义与图像控件菜单交互标注形位公差

实现形位公差交互标注的方法有多种，但基本上都是用ＡｕｔｏＬＩＳＰ语言和菜单文件结合编程实现的，本文介绍的方法是在ＡｕｔｏＣＡＤ１４．０中，用引形定义与图像控件菜单交互标注形位公差。     

Verb Semantics Affects the Interpretation of Spatial Prepositions

Abstract

Spatial prepositions, more specifically projective prepositions, such as in front of or behind can be interpreted in different ways. Their interpretation depends on the spatial perspective taken as the basis for determining the reference frame's orientation. In 3 series of placement experiments with German speakers, we examined whether the interpretation of projective prepositions in a motion context is affected by the verb used in a spatial instruction. Results suggest that verb semantics is a factor accounting for previously observed seemingly social-situational differences in the interpretation of projective prepositions. Specifically, the findings indicate that, relative to a car as reference object, the semantic aspect of motion interruption associated with some verbs leads to a higher proportion of deictic interpretations determined by the direction from which one is approaching the car. This verb effect on the interpretation of spatial prepositions can be explained by an activation of the temporal dimension through stop-implying verbs, which is integrated into the spatial situation model of the perceived dynamic scene making the deictic frame of reference more compatible. The experimental evidence also shows that verb semantics can account for previously unexplained cross-linguistic differences, and is related to patterns concerning the prepositional inventory of languages.     

容积分维用于临界参数的识别

分形和混沌作为两种常见的非线性现象，它们之间是否存在什么联系？本文通过Lorenz方程的研究，得出利用随参数变化的时间序列分维图，可以很好地识别非线性模型从确定性状态到混沌状态的临界参数点或区域。     

基于降维STAP 的自适应单脉冲测角算法

将空域广义单脉冲测角算法扩展至空时二维,提出基于降维STAP的自适应单脉冲测角算法,通过实时自适应修正鉴角曲线来降低角误差,实现杂波环境下的目标角误差估计,并且计算复杂度较低,从而保证机载平台在强杂波环境下对目标的稳定跟踪.仿真结果验证了该方法的有效性与性能优势.     

Lineament mapping and fractal analysis using SPOT-ASTER satellite imagery for evaluating the severity of slope weathering process

The present study describes a remote sensing approach for preparing lineament map that subsequently indicates the influence of lineament density in the severity of weathering development. In this study, SPOT-5 data, the integration of SPOT-ASTER and Digital Elevation Model (DEM) data were used and processed. The existence of an active fault system in the south of Mashhad city, NE Iran and presence of schistose rocks in this area result in the development of numerous lineament features. This region was selected for this research. Lineament features including fractures, bedding plane, cleavage, shear zones and schistosity were mapped in the study area. The results indicate that the highest concentration of lineaments occurred in the central-western and south-eastern parts of the study area, which coincide with metamorphic outcrops and NW-SE trending fault system. A comparison of lineament statistical analysis and field survey demonstrated that the structural discontinuities have a significant effect on forming and distribution of weathering profiles. It was observed that increasing the number, length and density of structural discontinuities led to strong severity in weathering, which can produce deep residual soils susceptible to landslide occurrence. The remote sensing approach developed in this study can be applicable for preparing lineament maps and evaluating the severity of weathering development in other active fault zones around the world.     

月球表面粗糙度的分形表征

文中采用"嫦娥一号"卫星探测器返回的激光高程计的数据,从研究月球表面的分形特征出发,选取月球表面的湿海区域进行研究,通过对激光高度计的原始数据进行处理,并利用SPSS统计软件对这两组数据进行拟合得到最佳的拟合模型。结果指出:1)分维可以作为一个独立的表征参量来表征粗糙表面的平缓程度。2)由拟合结果图可知,对于月球表面的湿海区域,分维与粗糙度存在单调递增关系,即分维值越大,区域表面越粗糙,表面起伏变化也越剧烈;并通过分析得出湿海区域的地形起伏较大。3)通过分维值D与粗糙度之间的关系式,对于某区域的任意一段轮廓,可以通过计算分维值D得出该轮廓的粗糙度值。同样的,对任一粗糙度值,可以求出相应的分维值以及该轮廓的具体纬度值位置。4)对于月球表面的其他区域,同样可以得出他们之间的相关性,从而达到研究月表地貌演化过程的目的。