Integrity monitoring-based ambiguity validation for triple-carrier ambiguity resolution

GPS Solutions - Frequency diversity is expected to benefit the ambiguity resolution (AR) with the modernization of global navigation satellite system. As one classic AR method, triple-carrier AR...     

皖江城市带植被NPP时空变化及其气候响应

针对现有植被净初级生产力研究对城市圈、城市带尺度缺乏关注的问题,基于MODIS遥感数据、地面气象资料等,利用改进的CASA模型,结合回归分析、相关分析等方法探究了2000—2013年皖江城市带植被NPP的时空变化及其对气候因子的响应,为区域生态环境质量评价提供参考。结果表明:近14年来,皖江城市带植被NPP总体呈增加趋势;不同土地利用类型NPP差异显著,林地草地耕地建设用地未利用土地水体;年NPP均值呈现由南部向西北部减少的空间分布特征;植被NPP年际变化率较小,介于±10gC·m-2·a-1范围内;温度是影响研究区植被NPP时空变化的主要气候因子。     

Performance of RegCM4 over Major River Basins in China

A long-term simulation for the period 1990–2010 is conducted with the latest version of the International Centre for Theoretical Physics' Regional Climate Model(RegCM4), driven by ERA-Interim boundary conditions at a grid spacing of 25 km. The Community Land Model(CLM) is used to describe land surface processes, with updates in the surface parameters,including the land cover and surface emissivity. The simulation is compared against observations to evaluate the model performance in reproducing the present day climatology and interannual variability over the 10 main river basins in China,with focus on surface air temperature and precipitation. Temperature and precipitation from the ERA-Interim reanalysis are also considered in the model assessment. Results show that the model reproduces the present day climatology over China and its main river basins, with better performances in June–July–August compared to December–January–February(DJF).In DJF, we find a warm bias at high latitudes, underestimated precipitation in the south, and overestimated precipitation in the north. The model in general captures the observed interannual variability, with greater skill for temperature. We also find an underestimation of heavy precipitation events in eastern China, and an underestimation of consecutive dry days in northern China and the Tibetan Plateau. Similar biases for both mean climatology and extremes are found in the ERA-Interim reanalysis, indicating the difficulties for climate models in simulating extreme monsoon climate events over East Asia.     

Applicability of Kinetic Models for In Situ Combustion Processes with Different Oil Types

The in situ combustion (ISC) process is of interest as an enhanced oil recovery method because it is an alternative to traditional steam-based processes for heavy oil and bitumen recovery. ISC is a technique applicable outside the window of reservoir conditions deemed appropriate for steam injection (such as deeper and thinner reservoirs). The process involves complex chemical reactions and physical recovery mechanisms, and predicting the likelihood of successful ISC in field applications remains challenging. This paper describes a numerical investigation of the capability of different ISC kinetic models to predict the combustion behaviors of different types of oils (light oil, heavy oil, and bitumen). Three kinetic models (of Coats, Crookston, and Belgrave) were selected from literature and compared using data from four published combustion-tube experiments. The comparison procedure is as follows: (1) validate the numerical modeling of each kinetic model by matching the selected experimental results or duplicating the numerical results found in published literature; (2) adjust fluid viscosities and densities to match the fluid properties of each experiment;and (3) use each validated kinetic model to predict the performance of the other experiments without further tuning the kinetic parameters. The knowledge derived from the experiments provides guidance for choosing the appropriate kinetic model when no other data are available and for the preliminary design and screening study of a potential ISC project.     

中国陆区S波分型与上地幔地震各向异性

本文利用中国大陆区共8个台站所观测到地震事件的S波数据，采用相关分析的手段以 观测数据重建的技术，进行了S波分裂参数－快慢波延迟时间与快波偏振方向的计算，并分析了S波分裂参数与中国陆区上地幔物质运动的相互关系，研究了结果表明，兰州台下的S波分裂时差最小，北京台下的最大，中国东部地区上地幔运动方向以西北向为主，西部地区以北偏西为优势。     

地理信息系统开发方法的演进

随着计算机科学和软件工程技术的进步 ,GIS软件工程方法在不断地演进 ,越来越适合于GIS的开发。文中介绍和回顾了GIS在自身的发展过程中使用的一些软件工程方法 ,并初步探讨了为GIS项目选用软件开发方法的问题。     

隔河岩大坝GPS形变监测数据分析

针对隔河岩大坝外观变形GPS自动化监测系统提供的数据资料，用逐步回归分析法进行数据分析，研究了大坝短期和长期的形变规律。     

卫星遥感结合地面资料对区域表面动量粗糙度的估算

利用地面湍流观测资料估算了黑河实验区几个典型下垫面的局地地表动量粗糙度，与卫星观测Landsat TM资料相结合得到了由标准化差值植被指数(NDVI)计算地表动量粗糙度的经验关系式，进而估算了实验区夏季和近冬季的地表粗糙度的区域分布，并对所得关系式进行了合理性检验。     

偶氮胂Ⅲ—重铬酸钾动力学光度法测定痕量锡

基于0.02mol/L H2SO4介质中，以抗坏血酸为活化剂，痕量Sn对K2Cr2O7氧化偶氮胂Ⅲ裉色反应的催化作用，建立了测定痕量锡的动力学光度法，方法检出限为0.05μg/L，线性范围为0～4.0μg/L,终止反应后，吸光度可稳定4h。结合磷酸三丁酯色谱分离，对水系沉积物国家一级标准物质进行分析，结果与标准值相符。以ω（Sn）为10^-6水平的试样进行精密度检测，其RSD(n=6）≤6.0%。     

乌鲁木齐旅游业与旅游资源开发

发展乌鲁木齐的旅游业要以资源为基础、市场为导向，重点开发博格达峰冰川公园景区、南山西景区、南山东景区、亚洲大陆中心景区、水磨沟景区、天山一号冰川景区、达坂城景区、月亮台子景区。以博格达峰冰川公园、亚洲大陆中心、南山二个滑雪场开发为先导，重点规划设计，重点投资建设。完善已有的南山东、西两个景区建设，使旅游业产生新的经济动力。同时，发挥乌鲁木齐市的枢纽和纽带作用，促进新疆旅游业的全面发展。