新疆地下流体数字化改造项目中的几个特点

新疆地下流体数字化改造只对温泉、库尔勒和乌什3个观测站进行了改造.这3个观测站所处的环境和条件相差很大,各有特色,在改造中没有统一的模式,而是根据各自的特点结合新疆的实际情况,采取了观测室与水井分离、用水位仪观测流量、扩频微波传输和同孔多项综合观测等措施进行了改造.实践表明这些措施的技术和方法在地下流体台网建设中有较大的参考和推广价值.     

磁纬20°以下地区哨声多台宽带定向观测及其初步结果

武汉大学哨声组与日本名古屋大学空电研究所合作于1988年1月在我国南方进行了哨声多台宽带定向测量。利用近两年研制的宽带数字化频率追踪定向分析系统,首次获得了磁纬20°以下地区哨声波出口区与偏振状态的实验结果。初步分析发现,在湛江附近（磁纬约10°N）存在一个比较稳定的哨声路径出口区,三台同时接收到的哨声大多从这同一出口区透射出来;有时存在两个出口区,一个仍位于湛江附近,另一个位于桂林和武昌之间;沿两条不同路径传播的同源哨声具有几乎相同的色散。本文所做的非导管射线追踪计算能比较满意地解释定向实验结果。另外,此次观测中还发现一些新的有意义的现象,如记录到近百例两跳、三跳及五跳回波等,这在低纬地区是非常少见的。     

The lunar exosphere: The sputtering contribution

We have extended our Monte Carlo model of exospheres [Wurz, P., Lammer, H., 2003. Icarus 164 (1), 1-13] by treating the ion-induced sputtering process from a known surface in a self-consistent way. The comparison of the calculated exospheric densities with experimental data, which are mostly upper limits, shows that all of our calculated densities are within the measurement limits. The total calculated exospheric density at the lunar surface of about 1×¹⁰⁷ m⁻³ as result of solar wind sputtering we find is much less than the experimental total exospheric density of about ¹⁰¹² m⁻³. We conclude that sputtering contributes only a small fraction of the total exosphere, at least close to the surface. Because of the considerably larger scale height of atoms released via sputtering into the exosphere, sputtered atoms start to dominate the exosphere at altitudes exceeding a few 1000 km, with the exception of some light and abundant species released thermally, e.g. H₂, He, CH₄, and OH. Furthermore, for more refractory species such as calcium, our model indicates that sputtering may well be the dominant mechanism responsible for the lunar atmospheric inventory, but observational data does not yet allow firm conclusions to be drawn.     

国家基础多源数字正射影像数据库的设计与建立

数字正射影像直观而详细地记录了地表的自然现象,具有良好的可判读性和可测量性,从而成为现代GIS应用越来越重要的数据源。本文针对国家基础数字正射影像数据库安全存储、集成管理、分发服务和提供应用的技术要求,通过对海量数字正射影像数据建库的数据源分析与探讨,提出了适合多源数字正射影像建库的数据组织方式和数据存储模式,最后设计建立了国家基础多源数字正射影像数据库系统．实现了国家级海量多源数字正射影像数据的存储管理和数据服务。     

Digital Geological Mapping of Sinus Iridum Area of the Moon Based on the Chang’E-I Data

Based on the CCD images,IIM data and DEM data of China＇s lunar exploration project （Chang＇E-Ⅰ） and related processed and analytic results,an integrated study of regional geology of Sinus Iridum and its adjacent area was conducted,and a series of relevant researches and analyses were carried out,including analysis of impact craters and their extrusive and accumulative materials,division of stratigraphic and tectonic units and classification of rock types,integrated analysis of chronology and lunar evolution history.In consideration of crater＇s shape features,quantity and preserving status of filling materials,the lunar impact craters can be divided into 7 types and 11 subtypes,and the accumulative materials of craters are divided into 6 types and 9 accumulative groups.According to the content and distribution of TiO2 and image characteristics,the basalts are divided into high-TiO2,medium-TiO2 and low-TiO2 basalts.Discussion was made on division of tectonic units and evolution features in the study area.The geological map of the Sinus Iridum Quadrangle （LQ-4） at a scale of 1∶2.5 M was preliminarily compiled with the ArcGIS system,and the spatial database of the map was established.Related technical specification,procedure and method for lunar geological mapping have been worked out,so as to lay a foundation for the forthcoming geological mapping of the global Moon in China by using the data of Chang＇E-Ⅱ and also for comprehensive study and geological mapping of other celestial bodies in the future.     

NCDSN台站DIMAS系统中震相标识的再现

NCDSN台站的数字地震资料在PC机上通常使用DIMAS系统进行处理,当用户使用WGSNPLOT.EXE图形分析软件分析处理完一个地震,它不会像SUN工作站上使用的ARS系统那样能对处理过的波形及标识进行存储,以便需要时重新显示于屏幕上,本文在这方面作了一些探索,所开发的软件能使数字地震波形的标识重新显示在波形图上,使得再次分析使用变得简单易行。     

短周期与宽频带数字地震计记录波形相关分析

为了研究短周期与宽频带数字地震观测系统的一致性,分别对山东地震台网青岛、济南、荣成、五莲、烟台的5个同一摆墩上安装的两套观测系统记录的同一地震事件波形资料进行了相关性分析。先将宽频带记录通过等波纹带通滤波器进行频带为1~20 Hz的滤波处理,再将短周期记录进行过采样处理,实现与宽频带记录的采样率一致。分析表明,宽频带和短周期地震计记录近震、地方震和非天然近距离地震波形在形态上一致,地震波形的振幅和相位存在较好相似性,震中距越近地震波形振幅和相位的相似度越高,宽频带和短周期地震计得到速度震级间差别不大,一致性较好。     

新疆数字测震台网的监测能力及其构造意义

新疆地震监测台网从1970年前的4个台发展到2008年数字测震台网建设完成以后,共有测震台站63个,结合邻省的15个地震台站的实时数据,地震监测能力得到极大的提高。阿勒泰构造小区、西准噶尔小区、北天山西段、南天山东段和西段现今的地震监测能力为1.5~2.0级,东天山为2.0~2.5级,西昆仑、阿尔金和交汇区为2.5~3.0级,乌鲁木齐和喀什附近地区的现今监测能力为0.5~1级。新疆数字测震台网的建设着重考虑了对新疆活动构造的监测,目前对新疆大部分活动断裂带的监测能力都在1.0~1.5级,这对今后的地震监测预报和防震减灾工作有十分重要的意义。     

新疆数字化形变观测的潮汐参数及稳定性分析

利用潮汐分析的方法,分析和评价了新疆数字化形变观测资料的精度和稳定性.结果表明,主波M2波、O1波的潮汐因子的纬度分布与理论值有较好的一致性,中误差小;各台仪器的观测精度达到并超过了中国地震局形变Ⅰ类台的标准;地倾斜类观测仪器精度高,稳定性好,尤其是水管倾斜仪的各项指标普遍高于其他类仪器,mγ<0.005;硐体应变仪的δα/α＜0.03,体应变仪的δα/α＜0.01,超过δα/α＜0.05的指标.研究还发现,个别台站仪器定向和方位角存在较大偏差.     

Distribution of Olivine and Pyroxene Derived from Clementine Data in Crater Copernicus

In order to derive the distribution of olivine and pyroxene in Crater Copernicus,we compute two band ratios(950/750 and 2 000/1 500 nm) ,percent content of elements(Al%,Ca%,Mg%,FeO%) and maturity(Is/FeO) based on Clementine UVVIS and NIR image data.The central peaks of Copernicus,which are known to be olivine-rich or pyroxene-rich,are chosen as ground truth and ROIs used to derive the distribution of olivine and pyroxene with a decision tree and spectral angle mapper(SAM) .Additionally,we compared previous ...