GPS水准高程拟合精度探讨

论述了应用GPS定位技术,求定地面点的正常高的方法,并对应用最广泛的GPS水准方法做了论述,找出了影响这种方法的主要原因并通过实例对如何提高精度作了详细的探讨。     

华南板块泥盆纪层序地层及海平面变化

华南板块在泥盆纪时期属东亚古特提斯泛大洋中华夏古陆群的一部分,它和冈瓦那大陆与北方大陆群(北美、东欧、西伯利亚等)处于不同的构造背景下。华南泥盆系分布广泛、发育齐全,可以作为东亚泥盆系的典型地区。本文根据华南黔桂、龙门山及南秦岭泥盆系10余条部面层序地层划分和对比,识别出21个与二级海平面变化响应的层序和T—R旋回,并与Johnson (1985,1992)和Ross (1988)以欧美大陆为代表的泥盆纪的T—R旋回进行了对比,并讨论二者之间的异同及其控制因素。     

Excel VBA数据处理软件开发

ExcelVBA编程通过对Excel自身功能的集成和扩展可以较为快捷地形成一个完整的数据处理软件。本文以地下流体数据处理软件开发为实例,简要论述了ExcelVBA开发数据处理软件的思路、方法和技术要点,同时还列举了一些通用代码供大家参考和使用。     

A study of biases in simulation of the Indian Ocean basin mode and its capacitor effect in CMIP3/CMIP5 models

Based on 15 Coupled Model Intercomparison Project (CMIP) phase 3 (CMIP3) and 32 CMIP phase 5 (CMIP5) models, a detailed diagnosis was carried out to understand what compose the biases in simulation of the Indian Ocean basin mode (IOBM) and its capacitor effect. Cloud-radiation-SST (CRS) feedback and wind-evaporation-SST (WES) feedback are the two major atmospheric processes for SST changes. Most CMIP models simulate a stronger CRS feedback and a weaker WES feedback. During boreal fall of the El Niño/Southern Oscillation developing year and the following spring, there are weak biases of suppressed rainfall anomalies over the Maritime Continent and anomalous anticyclone over South Indian Ocean. Most CMIP models simulate reasonable short wave radiation (SWR) and weaker latent heat flux (LHF) anomalies. This leads to a weak bias of atmospheric processes. During winter, however, the rainfall anomalies are stronger due to west bias, and the anomalous anticyclone is comparable to observations. As such, most models simulate stronger SWR and reasonable LHF anomalies, leading to a strong bias of atmospheric processes. The thermocline feedback is stronger in most models. Though there is a deep bias of climatology thermocline, most models capture reasonable sea surface height-induced SST anomalies. Therefore, the effect of oceanic processes offset the weak bias of atmospheric processes in spring, and the tropical Indian Ocean warming persists into summer. However, anomalous northwest Pacific (NWP) anticyclone is weaker due to weak and west bias of the capacitor effect. The unrealistic western Pacific SST anomalies in models favor the westward extension of Rossby wave from the Pacific, weakening the effect of Kelvin wave from the Indian Ocean. Moreover, the western Pacific warming forces the NWP anticyclone move farther north than observations, suggesting a major forcing from the Pacific. Compared to CMIP3, CMIP5 models simulate the feedbacks more realistically and display less diversity. Thus, the overall performance of CMIP5 models is better than that of CMIP3 models.     

网购时代广州市居民购买食品行为特征

基于广州市居民食品购物行为问卷调查数据,利用交叉频数、卡方检验和对应分析,通过网购食品者同不网购食品者、不同区位网购食品者、不同网购食品频率者的对比,分析了网络购物影响下广州市居民购买食品行为的一般特征和空间特征。结果发现:1)网络购买食品的接受度总体不高,传统实体购物模式仍占主导,网络购买食品对实体店购买食品有一定的替代沁。2)网络购买食品对居住地周边商店负面影响较大,对商业区影响很小,超市和百货公司休闲零食、地方特产类食品销售会受到一定负面影响,生鲜类商店所受影响较小。3)不同区位居民网购食品的频率差异较小,单次花费、时间和网购原因空间差异较大,实体购物条件差的居民更倾向于网络购买食品,验证了Anderson等提出的“效率假说”。4)网购食品者的实体购物出行目的休闲性增加,周末购物出行更频繁,网购食品频率高的居民购物出行时间更短。     

An intelligent agent based on virtual geographic environment system

On the basis of previous work, this paper designs an intelligent agent based on virtual geographic environment (VGE) system that is characterized by huge data, rapid computation, multi-user, multi-thread and intelligence and issues challenges to traditional GIS models and algorithms. The new advances in software and hardware technology lay a reliable basis for system design, development and application.     

The effect of cemented soil strength on the frictional capacity of precast concrete pile–cemented soil interface

Acta Geotechnica - The pre-bored grouted planted (PGP) pile is a composite pile consisting of a precast concrete pile and the cemented soil around the pile. Thus, the PGP pile shaft capacity is...     

武当-桐柏-大别成矿带铜矿成矿规律

武当-桐柏-大别成矿带可分为南秦岭造山带、北淮阳构造带、桐柏-大别构造带三个二级构造单元,在南秦岭造山带广泛分布变质热液型铜矿,北淮阳构造带内产出VMS型、岩浆熔离型及斑岩型铜矿,桐柏-大别构造带则分布有岩浆热液型和矽卡岩型铜矿。构造单元的性质对区内产出的铜矿类型具有较强的控制作用。变质热液型铜矿主要与浅变质作用有关,变质流体以断层为运移通道并最终就位于黑色岩系内的次级断层。VMS型、岩浆熔离型、斑岩型铜矿与岩浆作用密切相关,产出在岩体内部及与围岩的接触带。岩浆热液型及矽卡岩型铜矿形成于岩浆作用晚期阶段,分布在岩体与围岩接触带及附近构造裂隙带等部位。