井水位地震效应特征研究

震后效应是较普遍和复杂的自然现象,各种物理、化学量的变化动态隐含着丰富的地壳活动的动力学信息,对其研究具有重要的理论和实际意义.本研究以典型观测井的水位震后效应为研究对象,分析震后效应的动态规律及其与构造应力环境的关系.系统的研究结果表明:①同一口井的震后效应方式与地震的强度和位置无关,对于同一口井不同地震引起的效应总是同向的,即总是上升或下降;②对于水位效应较显著震例,水位变化幅值与震级、距离之间具有很好的统计关系;③井点附近发生强震后的若干年内,井水位无后效,也就是说井水位响应灵敏度要受本地的应力状态的影响而随时间发生变化,本地发生中强以上地震后,响应灵敏度会降低;④对某些特定地区或方位的地震,井水位的后效幅值偏小.这些结果说明,井水位的地震后效除了与震级、距离有关外,更重要的是可能与水井所在地区的应力状态及地震波传播途径的地质背景有关.     

云南省新平县哀牢山地区富硒土壤成因及其影响因素研究

以云南省新平县者竜—戛洒地区1∶5万土地质量地球化学调查评价结果为基础,对该地区富硒土壤的成因及其影响因素进行分析,结果表明,研究区土壤硒平均含量为0.38 mg/kg,高于全国土壤硒平均含量0.29 mg/kg,按0.4 mg/kg相似文献   

MICAPS卫星云图的二次开发

ＭＩＣＡＰＳ卫星云图文件不具有通用性,该文介绍了采用“ｓｈｅｌｌ”函数调用Ｍｉｃａｐｓ操作程序、用剪贴板“抓”图和直接将卫星云图文件的数据格式转换为ｂｍｐ位置的三种方法对卫星云图进行二次开发的具体操作。     

试用极轨气象卫星遥感监测土壤墒情

讨论了用极轨气象卫星资料监测表层土壤湿度的方法。在建立土壤湿度与卫星遥感资料的关系时，为了消除土壤条件的影响，把全省分为４个区域来研究。考虑了气候条件，植被状况不同的影响，并给出了简单的订正方法，同时也给出了卫星资料的重新地理校正，资料的输出及存储方法等。     

超微量钐同位素的热表面电离质谱分析

采用双带测量方式,法拉第杯和离子计数器同时接收与跳峰接收相结合,建立了超微量钐同位素的热表面电离质谱的测量方法。优化了制样程序和质谱测量程序,研究了蒸发带电流对离子流强度的影响,考察了从纳克至微克不同样品用量的测量效果及其中Nd、Eu干扰核素的情况。对4 ng~2μg的天然丰度钐样品进行了同位素比值分析,相对标准偏差均小于1.1%。     

贺兰山奥陶系研究的新进展

近年来,作者对贺兰山区奥陶系进行了岩石地层及生物地层学的研究,取得了新的进展。确证该区寒武系与奥陶系为连续沉积,对奥陶系进行了合理划分和时代厘定,初步建立了11个化石带或生物组合。该区是华北地台西缘奥陶系发育最好、生物地层研究最清楚的地区。根据沉积物及生物特征,确认本区中奥陶统为大陆边缘斜坡相沉积,浊流特征颇为典型。是研究斜坡沉积作用及其相模式、古构造古地理演化及其含矿性的理想地区。     

2012年夏季秦巴山区暴雨过程的地形作用诊断

利用NCEP/NCAR的1°×1° FNL再分析资料对2012年7月3—4日发生在陕西南部秦巴山区暴雨过程的成因及地形对暴雨的作用进行了诊断研究,同时利用中尺度模式WRFV331模拟了暴雨过程,结果表明：500 hPa高原槽、700、850 hPa的低涡切变线和副高外围西南气流是暴雨的主要影响天气系统。700 hPa副高外围的西南气流从云贵高原推进到秦岭南坡并沿坡爬升,同时还与山前的偏东气流汇合而形成气流辐合区,致使气旋性涡度增大,辐合抬升作用造成强垂直上升运动,低层低涡切变线得以发展和维持,秦岭南坡产生了大暴雨,秦巴山区地形对暴雨有显著的增幅作用。高原槽中冷空气从秦岭以北向南侵入,大巴山以南的西南暖湿气流向北推进,在冷暖空气的交汇地带形成斜压锋区;地形的辐合抬升作用加强中低层大气锋生,增大大气斜压不稳定性,触发不稳定能量的释放,有利于暴雨的发生。暴雨发生期间秦巴山区在垂直方向上,雨水、云水、冰晶的大值中心相互对应,存在“播撒—供给”效应,有利于雨水粒子增多,导致山区出现了强降雨。     

A Euler number-based topological computation model for land parcel database updating

Intersection relations are important topological considerations in database update processes. The differentiation and identification of non-empty intersection relations between new updates and existing objects is one of the first steps in the automatic incremental update process for a land parcel database. The basic non-empty intersection relations are meet, overlap, cover, equal and inside, but these basic relationships cannot reflect the complex and detailed non-empty relations between a new update and the existing objects. It is therefore necessary to refine the basic non-empty topological relations to support and trigger the relevant update operations. Such relations have been refined by several researchers using topological invariants (e.g., dimension, type and sequence) to represent the intersection components. However, the intersection components often include only points and lines, and the refined types of 2-dimensional intersection components that occur between land parcels have not been defined. This study examines the refinement of non-empty relations among 2-dimensional land parcels and proposes a computation model. In this model, an entire spatial object is directly used as the operand, and two set operations (i.e., intersection (∩) and difference (\)) are applied to form the basic topological computation model. The Euler number is introduced to refine the relations with a single 2-dimensional intersection (i.e., cover, inside and overlap) and to distinguish the refined types of 2-dimensional intersection components for the relations with multiple intersections. In this study, the cover and overlap relations with single intersections between regions are refined into seven cases, and nine basic types of 2-dimensional intersection components are distinguished. A composite computation model is formed with both Euler number values and dimensional differences. In this model, the topological relations with single intersections are differentiated by the value of the dimension and the Euler number of the resulting set of the whole-object intersection and differences, whereas the relations with multiple intersections are discriminated by the value of the resulting set at a coarse level and are further differentiated by the type and sequence of the whole-object intersection component in a hierarchical manner. Based on the refined topological relations, an improved method for automatic and incremental updating of the land parcel database is presented. The effectiveness of the models and algorithms was verified by the incremental update of a land cover database. The results of this study represent a new avenue for automatic spatial data handling in incremental update processes.     

六安地区BBVS-60与KS-2000宽带地震计系统性能分析

通过对六安地区BBVS-60与KS-2000地震计系统记录台基噪声功率谱密度计算,和正弦标定数据处理,尤其通过对仪器系统记录地震震相分析,比较两种类型宽频带地震计系统的性能差异,为台站地震记录震相分析与仪器维护提供技术支持.