云南兰坪盆地古近系构造-层序岩相古地理特征分析

构造—层序岩相古地理编图就是将岩相古地理的研究和编图与层序地层学的研究、盆地构造发展演化紧密结合,利用层序界面和其他关键界面为相对等时界面,按相关界面划分体系域,并以体系域为成图单元,采用体系域压缩法编制构造—层序岩相古地理图。以云南兰坪盆地古近系为例,进行构造—层序岩相古地理分析研究并编制构造—层序岩相古地理图,进而揭示该区古近纪构造运动对沉积特征与湖平面变化的关系,更进一步阐明该区盆地沉积充填的时空演化特征。     

对样品含水结构的电阻率CT研究

采用高密度的电极阵列,对具含水结构样品的视电阻率值进行了测定,并重建了二维电阻率的图象．所得一系列CT图象揭示了样品内部由于裂隙和流体造成的真电阻率分布及其变化．这一方法用于岩石电性模拟实验,使导致样品电性变化的裂隙充水过程得以清楚地揭示．      

1999年山西大同-阳高5.6级地震灾害损失评估

１９９９年１１月１日在山西省大同县和阳高县间发生Ｍｓ５．６地震,通过野外调查,对这次地震灾害损失进行了评估。评估结果表明,这次地震受灾面积达３２４ｋｍ＾２,主要受灾村５６个,重伤１０人,轻伤６０人,总经济损失为１４０２３万元。指出灾区所有房屋经历了１９８９年、１９９１年１次或２次中强地震的破坏,抗震能力明显降低是这次震害较生的主要原因。并针对这次震害的特征,提出防御与减轻震害的经验、教训及有关建议     

Dopplergram Calibration

In this paper a procedure to calibrate dopplergrams is presented. This procedure is instrument independent and is based on the main topological characteristics of solar rotation. It is reliable in those regions on the solar disk where the sensitivity can be considered linear in the east-west direction (that is, out to 0.75 solar radius for most instruments) and, in principle, can be applied to all dopplergrams with medium spatial resolution (typically 8 arc sec pixel^–1). The aim of this calibration is to correct any variation of the sensitivity to the velocity signal caused by instrumental changes. The procedure is currently applied to data obtained at the Solar Observatory at Kanzelhöhe (Austria) with a sodium magneto-optical filter. The procedure, applied to a one-day run, shows how the low-degree five-min oscillations are recovered from the raw integrated Doppler signal over the whole CCD.     

Observation Study on Precursory Geosound: Extraction of Nucleation Information in the Earthquake Preparation Process

In this paper, the observation networks of precursory geosound and observation instruments are introduced first. Then it is mentioned, in particular, that audible precursory geosound was instrumentally recorded for the first time. The following section discussed the relation between the geosound and earthquake. Finally, the Nucleation time in earthquake preparation process is discussed.     

丽江高美古的天文观测条件

综述对丽江高美古的视宁度、天光亮度、消光系数进行观测的原理、仪器、观测方法和结果．结果表明,高美古是我国南方的优良光学天文台址,视宁度达到世界优良台址的水平     

北京地区风沙活动及其整治的初步研究

根据两年来北京地区的野外风沙考察,半定位风沙(尘)观测,室内风洞实验以及有关区域资料的分析研究得出:风沙问题是北京区域环境存在的严重问题之一,区域风沙活动由来已久,在频繁程度上不亚于半干旱区的河北坝上和乌盟后山地区。区内各地风沙活动均以春季为主,冬春两季风沙活动约占全年的80%以上。风沙天气的年际变化较大,五十年代最为频繁,六十年代最少,七十年代初期又有回升,中期以后至八十年代中期又逐渐趋于减少。风沙活动的形成及其盛衰变化,除与自然因素有关外,还与地表植被和土壤结构等因人类活动所造成的变化息息相关。风沙活动不仅使大气遭受污染,而且使土地资源遭受破坏。全区风沙危害严重的区域(风沙区)面积达342万亩,约占平原区总面积的35.6%,其中沙质地表因长期遭受风力作用所形成的风沙化土地面积约为136万余亩,占平原区面积的14.2%,以永定河冲积平原分布面积最大。研究证明,北京地区风沙主要来源于本地,系就地起沙。因此,风沙防治要立足于本地,特别是风沙土地的治理,对根治本区风沙危害、改善首都环境具有根本性意义。