利用VBA和Excel实现快速处理国产甚低频电磁仪DDS-1测量数据   总被引：4，自引：4，他引：0       下载免费PDF全文

李永兵  陈绪松  刘建明  张寿庭 《地球物理学进展》2005,20(1):225-230

本文在介绍甚低频数据计算原理和VBA编程技术的基础上,结合实际工作需要,利用电子表格软件Excel和VBA编程模型编制VLF数据处理程序,实现甚低频电磁仪测量数据的自动处理,并对程序实现细节作了必要说明.实践表明,应用该处理程序可大大缩短数据处理时间、提高工作效率、降低劳动强度.  相似文献   

Coastal risk adaptation: the potential role of accessible geospatial Big Data     

《Marine Policy》2017

Increasing numbers of people are living in and using coastal areas. Combined with the presence of pervasive coastal threats, such as flooding and erosion, this is having widespread impacts on coastal populations, infrastructure and ecosystems. For the right adaptive strategies to be adopted, and planning decisions to be made, rigorous evaluation of the available options is required. This evaluation hinges on the availability and use of suitable datasets. For knowledge to be derived from coastal datasets, such data needs to be combined and analysed in an effective manner. This paper reviews a wide range of literature relating to data-driven approaches to coastal risk evaluation, revealing how limitations have been imposed on many of these methods, due to restrictions in computing power and access to data. The rapidly emerging field of ‘Big Data’ can help overcome many of these hurdles. ‘Big Data’ involves powerful computer infrastructures, enabling storage, processing and real-time analysis of large volumes and varieties of data, in a fast and reliable manner. Through consideration of examples of how ‘Big Data’ technologies are being applied to fields related to coastal risk, it becomes apparent that geospatial Big Data solutions hold clear potential to improve the process of risk based decision making on the coast. ‘Big Data’ does not provide a stand-alone solution to the issues and gaps outlined in this paper, yet these technological methods hold the potential to optimise data-driven approaches, enabling robust risk profiles to be generated for coastal regions.  相似文献   

服务器虚拟化在数据中心的应用实践     

林洋  张颖 《华南地震》2015,35(1):62-66

通过虚拟化技术实现服务器整合,提高资源利用率、简化系统管理。基于四川省地震局数据中心服务器虚拟化应用,阐述了虚拟化平台的搭建过程,虚拟机部署,并介绍了虚拟化的应用经验。  相似文献   

龙滩水电站大坝强震动观测台网系统   总被引：1，自引：0，他引：1  

蒙陆斌  史水平  张忠利 《华南地震》2015,35(1):67-73

对红水河上游龙滩水电站大坝所安装的强震动监测台网技术系统进行了详细阐述,内容包括场地的工程概况、台网布局、仪器性能指标及技术系统、数据的采集分析等情况,为其他大坝强震监测台网设计作参考。  相似文献   

An integrated analysis of agricultural water-use efficiency: A case study in the Heihe River Basin in Northwest China     

《Physics and Chemistry of the Earth》2015

The water-use efficiency has direct impacts on the water consumption of agriculture production and is vital to water conservation at both local and regional extent. The agricultural water-use efficiency is a critical indicator that reflects the effective water allocation and water productivity improvement among different agricultural sectors. Taking the Heihe River Basin as the case study area, this study explores the changing trajectories of agricultural water use based on the input–output data of 2003–2012, and estimates the water-use efficiency with Data Envelopment Analysis, Malmquist Total Productivity Index and the decomposition of total factor productivity. Further, the influence of driving factors on the water-use efficiency is analyzed with the Tobit model. The research results indicate that the average agricultural water-use efficiency in different counties is all lower than 1 during 2003–2012, indicating that there is still improvement space in the agricultural water-use efficiency. In addition, there is obvious heterogeneity in the agricultural water-use efficiency among different counties, especially prior to 2009. The research results from the Tobit model indicate that agricultural investment and production, economic growth, industrial restructuring and agricultural plants structural adjustment have significant influence on the agricultural water-use efficiency. The research results can provide significant references for agricultural water-use management in the middle reaches of the Heihe River Basin and other similar regions in Northwest China.  相似文献   

Preliminary proposal of scientific data verification in CSES mission     

Lan-wei  Xu-hui Shen  Yu Zhang  Rui Yan 《地震科学（英文版）》2015,28(4):303-310

China Seismo-Electromagnetic Satellite(CSES)will be launched at the end of 2016 and the orbit is sunsynchronous and the altitude is about 500 km.The design of CSES satellite and ground segment are introduced in this paper first.And then the preliminary proposals of scientific data verification and cross-verification in CSES mission are given,which can be used to classify the payloads' operation state,and validate the reliability of data.  相似文献   

Spatially-resolved high-resolution spectroscopy of Venus 2. Variations of HDO, OCS, and SO₂ at the cloud tops     

Vladimir A. Krasnopolsky 《Icarus》2010,209(2):314-322

While CO, HCl, and HF, that were considered in the first part of this work, have distinct absorption lines in high-resolution spectra and were detected four decades ago, the lines of HDO, OCS, and SO₂ are either very weak or blended by the telluric lines and have not been observed previously by ground-based infrared spectroscopy at the Venus cloud tops. The H₂O abundance above the Venus clouds is typically below the detection limit of ground-based IR spectroscopy. However, the large D/H ratio on Venus facilitates observations of HDO. Converted to H₂O with D/H ≈ 200, our observations at 2722 cm⁻¹ in the Venus afternoon show a H₂O mixing ratio of ∼1.2 ppm at latitudes between ±40° increasing to ±60° by a factor of 2. The observations in the early morning reveal the H₂O mixing ratio that is almost constant at 2.9 ppm within latitudes of ±75°. The measured H₂O mixing ratios refer to 74 km. The observed increase in H₂O is explained by the lack of photochemical production of sulfuric acid in the night time. The recent observations at the P-branch of OCS at 4094 cm⁻¹ confirm our detection of OCS. Four distributions of OCS along the disk of Venus at various latitudes and local times have been retrieved. Both regular and irregular components are present in the variations of OCS. The observed OCS mixing ratio at 65 km varies from ∼0.3 to 9 ppb with the mean value of ∼3 ppb. The OCS scale height is retrieved from the observed limb darkening and varies from 1 to 4 km with a mean value of half the atmospheric scale height. SO₂ at the cloud tops has been detected for the first time by means of ground-based infrared spectroscopy. The SO₂ lines look irregular in the observed spectra at 2476 cm⁻¹. The SO₂ abundances are retrieved by fitting by synthetic spectra, and two methods have been applied to determine uncertainties and detection limits in this fitting. The retrieved mean SO₂ mixing ratio of 350 ± 50 ppb at 72 km favors a significant increase in SO₂ above the clouds since the period of 1980-1995 that was observed by the SOIR occultations at Venus Express. Scale heights of OCS and SO₂ may be similar, and the SO₂/OCS ratio is ∼500 and may be rather stable at 65-70 km under varying conditions on Venus.  相似文献   

汶川地震前后的气象异常   总被引：1，自引：0，他引：1  

石俊  王维侠  温敬霞 《天文研究与技术》2010,7(1)

有研究认为局地气象异常与地震之间存在着一定的相关性,那么震惊中外的汶川大地震前后有没有气象异常呢?应用NCEP再分析资料,以1988～2007年20年间局地气象要素的平均值和标准偏差为基准,通过构建气象异常指数对2008年5月12日汶川发生的大地震前后的日平均气温、日最高气温、日最低气温、日平均降水强度和日平均气压等5项气象要素指标的异常状况进行了分析,结果表明在地震前2个月的时间内有异常状况出现,并且其变化幅度和持续时间都比较长,在地震过后这些异常并未立即消失;从5项气象要素异常空间分异来看,汶川是气象异常的中心地带,表征了汶川地震与局地气象之间存在着一定的相关性。尽管气象异常是否是地震发生的必然前兆尚待进一步考证,但出现在汶川特大地震前后的气象异常再次给我们一个提示,即气象异常与地震的关系值得深入研究。  相似文献   

Dependence of Mean Sea Surfaces from Altimeter Data on the Reference Model Used     

G. Rodríguez-Velasco  M. J. Sevilla  C. De Toro 《Marine Geodesy》2013,36(4):289-312

A mean sea surface model is used as the frame of reference in processing altimeter data. This article focuses on ascertaining the extent to which results depend on the different mean sea surface models used. In particular, we have analyzed the results from the OSU95MSS and the CLS_SHOMv.98.2 models in an area in the North Atlantic Ocean comprising the Canary and Azores Islands. Special attention has been paid to data editing and several criteria were proposed. The amount of detected data is quite small because we used a well corrected data set. However, it was enough to show important relations between the applied criteria and the kind of area. Therefore we analyzed the best way to apply these criteria according to the areas where the points have been found. Singular areas related to several factors have been detected by all the suggested criteria. In particular, rough sea bottom features, dynamic circulation, and amphidromic points of the tidal waves, among others. As a result of this analysis, we have not considered it appropriate to remove all the detected points. Two time-averaged and corrected mean sea surfaces were determined in the test area.  相似文献   

基于GIS模式的数据仓专题图研究     

孙秋瑞  赵学辉 《东北测绘》2012,(1):43-46

针对基于GIS的BTEX油气化探数据仓地质专题图制作系统进行研究,分析了基于自动化制图理念的数据流,提出了系统的总体构架及基于国家标准的地质符号库,并根据油田地质成果图规范开发了BTEX油气化探数据仓数据挖掘成果图的制图模板。将该系统应用于渤中凹陷的BTEX数据综合评价图的制作,结果表明该软件具有较好的人机交互性和扩展性,在满足BTEX油气化探数据仓的处理结果专题地图的制作与成果展示的基础上,能够提高BTEX油气化探地质专题图的制图效率。  相似文献