应用卫星资料分析和预报热带气旋强度的方法

1.引言利用卫星云图监视热带风暴差不多有20年的历史了。1963年首次提出利用云图确定风暴强度的方法,当时是根据风暴云的形状以及它的云带和眼的外貌来确定强度。六十年代后期开始,一天已有几次的云图用来观察热带气旋,极轨卫星上的红外探测设备开始提供昼夜的观测,而早期的地球静止卫星提供白天时刻的连续监视,用卫星云图分析其强度。但是风暴云的特征与它的强度之间的关系,随时间有很大的变化,而且其特征的短时间的波动很大,有时足以模糊风暴发展的总趋势。单用一张云图做分析时,往往会使强度估计产生很大的误差。为了解决这个问题,提出了根据一系列云图特征,而不是仅仅依靠一张云图特征来估计每天强度的技术。     

基于ArcGIS Engine的地震风险预报与评估系统的设计与实现

提出利用ArcGIS Engine技术结合地震相关分析理论进行地震风险预报与评估系统设计,阐述设计原理及优势,并编程实现。系统综合集成地震分析、空间分析、重力分析及统计检验等功能,能有效提高地震风险预测评估一体化程度及震前灾害预警效率,并为地震灾害预警研究提供参考。     

Geology and Human Relations in the Upper Huangho Region

1. The different geological formations and their ecouomie sigmficances. (a)Alluvium (b)Loess (c)Red beds (d)Upper coal series and Sandstone formations (e)Lower coal series (f)Metamorphic series     

气象数据的采集、检验及管理

1.引言在过去的十年间,气象研究技术的发展已导致了采集及检验有关环境大气参数的数值信息系统的应用。因此,目前已有可能把数据的获取及处理工作全部实现自动化。     

Notes on the Geological Structure of the Washan-Omeishan Region

I. INTRODUCTION Bordering the SW margin of the Red Basin of Szechuan runs a roughly N-S mountain range which includes such mountains as Washan, Omeishan and Talliangshan (Pl. I) and for the sake of convenience is designated with the name of Liangshan Range. Among these mountains only the geology of the Omeishan region is fairly well known in consequence of the works done by many a geologist; of the Washan region, though had been visited by     

Cross-borehole flowmeter tests for transient heads in heterogeneous aquifers

Cross-borehole flowmeter tests have been proposed as an efficient method to investigate preferential flowpaths in heterogeneous aquifers, which is a major task in the characterization of fractured aquifers. Cross-borehole flowmeter tests are based on the idea that changing the pumping conditions in a given aquifer will modify the hydraulic head distribution in large-scale flowpaths, producing measurable changes in the vertical flow profiles in observation boreholes. However, inversion of flow measurements to derive flowpath geometry and connectivity and to characterize their hydraulic properties is still a subject of research. In this study, we propose a framework for cross-borehole flowmeter test interpretation that is based on a two-scale conceptual model: discrete fractures at the borehole scale and zones of interconnected fractures at the aquifer scale. We propose that the two problems may be solved independently. The first inverse problem consists of estimating the hydraulic head variations that drive the transient borehole flow observed in the cross-borehole flowmeter experiments. The second inverse problem is related to estimating the geometry and hydraulic properties of large-scale flowpaths in the region between pumping and observation wells that are compatible with the head variations deduced from the first problem. To solve the borehole-scale problem, we treat the transient flow data as a series of quasi-steady flow conditions and solve for the hydraulic head changes in individual fractures required to produce these data. The consistency of the method is verified using field experiments performed in a fractured-rock aquifer.     

Theoretical infrared spectra of some model polycyclic aromatic hydrocarbons: effect of ionization

In order to test the hypothesis of ionized polycyclic aromatic hydrocarbons (PAHs) as possible carriers of the UIR bands, we realized a computational exploration on selected PAHs of small dimension in order to identify which changes ionization would induce on their IR spectra. In this study we performed ab initio calculations of the spectra of neutral and positively ionized naphthalene, anthracene, and pyrene. The results are significantly important. The frequencies in the cations are slightly shifted with respect to the neutral species, but no general conclusion can be reached from the three molecules considered. By contrast, the relative intensities of most vibrations are strongly affected by ionization, leading to a much better agreement between the calculated CH/CC vibration intensity ratios and those deduced from observations.