GPS signal acquisition using the repeatability of successive code phase measurements

This paper introduces a new method for GPS signal acquisition, which is based on the repeatability of successive code phase measurements and the M-of-N search algorithm. The performance of the proposed method in terms of probability of signal detection is similar to that of traditional methods, except that the calculation of the probability of detection does not rely on the noise distribution or the Carrier-to-Noise ratio (C/N₀). The code phase repeatability-based method is presented along with equations for probability of detection and probability of false detection. If the distribution of the noise is known, it also provides an estimate of the C/N₀. The proposed method is illustrated for coherent and non-coherent acquisition and C/N₀ estimation.     

Dynamic data integration for structural modeling: model screening approach using a distance-based model parameterization

This paper proposes a novel history-matching method where reservoir structure is inverted from dynamic fluid flow response. The proposed workflow consists of searching for models that match production history from a large set of prior structural model realizations. This prior set represents the reservoir structural uncertainty because of interpretation uncertainty on seismic sections. To make such a search effective, we introduce a parameter space defined with a “similarity distance” for accommodating this large set of realizations. The inverse solutions are found using a stochastic search method. Realistic reservoir examples are presented to prove the applicability of the proposed method.     

Developing a SPASE Query Language

The advent of the Virtual Observatory has begun an evolution in the space physics data environment. A number of nascent and discipline specific Virtual Observatories have started to emerge with an emphasis on data search and retrieval. As this new data environment takes shape an emphasis will be placed on interdisciplinary communication in attempts to address large scale and global problems. To this end we formulate the development of a query language to facilitate Virtual Observatory to Virtual Observatory communication. Furthermore, we outline the goals of such a language, how it would work and how existing community efforts can be leveraged to speed the development of this query language.

应用VB+MapInfo开发的地震定位程序

利用OLE自动化方法，将MapInfo集成在VB中，在手工地震交切定位的基础上，开发了计算机定位程序，该程序与传统的定位方法相比，精度和效率都有较大幅度的提高。并在地震应急中发挥了作用。     

洪水演进三维模拟仿真系统可视化研究

洪水演进仿真系统的研制，是实施“数字流域”工程的重要组成部分；结合洪水演进可视化目标的分析，基于Visual C 系统开发平台，融GIS技术和Opengl开发技术，采用三角形逼近、光滑处理和加入法向量以控制光照的方式，实现了流域地形及河床的三维可视化仿真；应用广度优先搜索算法确定了运动水体与流域河床形态的自适应与自相依的关系，使流域洪水演进模拟具有真实自然的可视化效果。所研制的系统雏形，可有效的模拟流域洪水的三维演进过程；     

美国城市搜索与救援体系的组成及运作模式概述

美国城市搜索与救援体系是世界上最完善的体系之一，多年来在城市救灾和应对突发事件中发挥了重要作用，减轻了生命和财产的损失。文章概述了美国城市搜索与救援体系的组成、任务、运作原则和管理机构及支援机构。     

火山空降碎屑灾害预测软件包的研制

简述了火山空降碎屑灾害的危害性 ,指出研制火山空降碎屑灾害预测软件包的实际意义。介绍了软件的主要结构框图、软件设计的基本思路和结构设计时的几点考虑。介绍了在VisualBasic6 .0平台下 ,碎屑粒径参数、岩浆黏度、结晶压力、喷出压力、给定时间段和特定区域的各高度层风参数、岩浆动力学参数、喷出物总量、抛射体分布、坍塌阶段碎屑分布和扩散阶段碎屑分布计算等各程序的主要结构及主要功能。介绍了在Mapinfor 6 .0平台下软件的主要功能。给出了实现该软件包各项功能的理论基础和科学依据 ,并展示了 1980年 5月 18日美国圣海伦斯火山喷发的空降碎屑分布计算的实例 ,同时把计算结果与实际观测数据进行了对比 ,从而使模型的改进工作和软件的正确性得到了验证。最后 ,对软件存在的缺陷和需要进一步改进之处进行了细致的分析     

非线性编辑与线性编辑在气象电视节目中的使用

通过对非线性编辑与线性编辑两者的概念及其特点、优势的介绍,指出在气象电视节目的后期制作中,怎样恰当地选择使用非线性编辑、线性编辑或二者同时使用。     

航空短波红外分光谱遥感技术直接寻找油气藏的有效性及应用实例

采用航空短波红外分光谱遥感技术，在新疆准噶尔盆地和塔里木盆地某些油气区，进行直接寻找油气资源的试验研究后发现，油气区含油岩系，油气藏上方盖层土壤的光谱在２３００和２３５０ｎｍ波段具有双吸收特征。     

北秦岭二郎坪群低压变质作用研究

在对二郎坪群低压变质带进行相图分析后发现，二郎坪群低压变质带是叠加变质带，低压变质作用是在早期中压变质的抬升过程中发生的，中压变质的温压条件为0．5-0．6GPa、560～580℃，低压变质的压力为0．3-0．45GPa，红柱石-十字石带的温度为510～580℃，堇青石带为590-620℃。pT视剖面图在区分岩石中不同条件和期次的矿物组合及分析岩石温压演化历史和温压条件时显得更行之有效。