关于处处没有导数的连续函数求分数阶导数的例子

范德瓦尔登给出了一个著名的处处没有导数的连续函数的例子,本文求出了这个函数的分数阶导数。     

地形图智能综合系统的设计

本文论述了在地图数据库的基础上如何进行地形图智能综合系统的设计。地形图的自动综合是一个困难的大课题,本文只是就全要素的大比例尺地形图作了较详细的研究,同时提出了有关其它方面的策略。     

地形图综合对数字化的需求

地形图综合必须以数字景观模型为基础,因此,数字化时必须保证目标的景观特征的完整性。本文在分析地形图自动综合的规律基础上讨论了在数字化地形图时应遵循的原则。     

中国大陆现今垂直形变特征的初步探讨

利用GPS观测资料进行大范围的垂直形变特征研究是本文研究的重点。通过网络工程基准站和基本站的GPS观测资料，绘制了中国大陆的垂直速率等值线图像，并对中国大陆垂直运动特征进行了定性的分析，结果表明：中国大陆垂直运动在70％以上的区域表现为沉降运动，在青藏高原和除北京外的整个华北块体及燕山块体的垂直运动表现为隆升的趋势。中国大陆西北和东南、西南和东北的整体垂直运动呈一种斜对称状态。对基于GPS观测所得的等值线图与基于水观测所得的等值线图进行了比较，比较结果显示，除了华南块体外，二者在整体趋势上比较一致。     

General Entropy Model of Line Segments Uncertainty in GIS

Spatial data uncertainty can directly affect the quality of digital products and GIS-based decision making. On the basis of the characteristics of randomicity of positional data and fuzziness of attribute data, taking entropy as a measure, the stochastic entropy model of positional data uncertainty and fuzzy entropy model of attribute data uncertainty are proposed. As both randomic-ity and fuzziness usually simultaneously exist in linear segments, their omnibus effects are also investigated and quantified. A novel uncertainty measure, general entropy, is presented. The general entropy can be used as a uniform measure to quantify the total un-certainty caused by stochastic uncertainty and fuzzy uncertainty in GIS.     

加强思想性理论性实践性教学努力培养工民建测量人才

测量学是中等专科技术学校工民建专业的专业基础课 ,又是一门实践性很强的技能课 ,通过学习可以使学生了解和掌握测量的基本知识 ,基本理论和基本技能。学生毕业后无论从事造房盖楼还是修桥铺路 ,在工程开始后 ,遇到的第一件事就是施工放样 ,它直接关系到工程能否保证按图施工 ,且施工测量贯穿于工程施工的全过程 ,是保证工程质量的重要技术环节。因此 ,测量是他们的看家本领 ,到现场第一炮能不能打响 ,可以说很大程度上靠测量。从我们生产实践及对历届毕业生追踪调查情况看 ,毕业生在“对点” ,“量距” ,“扶尺” ,打桩”以及“测量技术在…     

广义点摄影测量在建筑物立面轮廓重构中的应用

采用广义点摄影测量理论对建筑物立面框架轮廓进行重构。广义点是对当代线摄影测量以及无穷远点（灭点）理论的升华。实验结果表明,采用线面基元进行立面重构相比于经典的点云重构方法,不仅简洁、高效,还能获得清晰的三维边缘轮廓,且自动化程度较高。     

An Examination of ENSO’s Effect on the Monthly and Seasonal Climate of Hong Kong from a Statistical Perspective

This study aims to examine the effect of El Nino and La Nina on the monthly and seasonal climate of Hong Kong against the ENSO-neutral situation from a statistical perspective. Monthly and seasonal temperature and rainfall of Hong Kong and monthly number of tropical cyclones (TCs) coming within 500 km of the city over the 59-yr (1950-2008) period are examined under three ENSO situations, namely El Nino, La Nina, and ENSO-neutral. It is found that, compared with the ENSO-neutral situation, El Nino tends...     

ANALYSIS ON CODE MULTIPATH MITIGATION BY PHASE - AIDED SMOOTHING

Multipath influence on code range under static condition is described firstly in this paper, and the problem that to what extent the phase-aided smoothing can mitigate multipath interference is detailed. Some problems regarding smoothing and mitigation are discussed. Suggestions based on the analysis has been made.     

Numerical Simulation for Refraction-Diffraction of Waves in Water of Slowly Varying Current and Topography

A new numerical finite difference iteration method for refraction-diffraction of waves in waterof slowly varying current and topography is developed in this paper.And corresponding theoretical modelincluding the dissipation term is briefly described,together with some analysis and comparison ofcomputational results of the model with measurements in a hydraulic scale model(Berkhoff et al.,1982).An example of practical use of the method is given,showing that the present model is useful to engineeringpractice.