The Method of Selection of Major-Shower Meteors Revisited     

L. Neslušan  J. Svoreň  V. Porubčan 《Earth, Moon, and Planets》2013,110(1-2):41-66

We apply so-called break-point method to select the dense cores of 10 major meteor showers from the photographic, video, and radio-meteor databases. The major showers can well be selected from photographic and video data, in a lesser degree from radio data. The obtained mean characteristics of Quadrantids, Lyrids, η-Aquarids, α-Capricornids, δ-Aquarids N, δ-Aquarids S, Perseids, Orionids, Leonids, and Geminids are presented. A test to indicate the existence of a suspected shower in radio database is suggested.  相似文献   

海水对海洋平台声发射传播特性影响研究     

贾光  杨国安  沈江  张淼 《海洋工程》2013,31(3):84-88

针对海洋平台水下钢结构无损检测的需要,研究在空气、淡水和海水作为耦合介质的情况下,声发射波在钢结构传播过程中幅值和能量的变化趋势,以及幅值和能量损失的原因。基于声发射波反射原理,分析声发射波在钢结构中传播的多径效应及波形转换特性,并解释了时域波形发生分离的原因。根据实验结果,分析了盐度对声发射波传播特性的影响。该项研究为提高海洋平台声发射检测中故障源的精确定位提供了实验依据。  相似文献   

石阡2020-05-20强降水天气气象服务经验总结和思考     

安承德  杜小玲  郎贵英  张吉  杨德强 《中低纬山地气象》2021,45(6):95-99

2020年5月20日的强降水是石阡县本年度最强降水天气过程,表现为强降水时段集中（20日02-07时）、降雨强度大（最大72.2mm/h）、影响区域广（全县范围）。文章首先利用CIMISS数据库降水资料分析了石阡2020-05-20大暴雨是由两轮短时强降水叠加造成的,尤其是第二轮强降水具有突发性强、雨强大、时间集中在1~2h的特点,其次介绍了此次强降水天气出现前、过程中的气象服务情况,然后总结了加强值班值守、做好短临监测、开展针对性气象服务有效弥补了预报上的不足,同时对存在的问题进行梳理,最后从预报预警的准确性、气象信息的及时性、灾害性天气的监测能力、业务人员专业水平、台站和部门间联动、气象工作宣传六方面进行思考,以期为今后开展气象服务提供一定的参考依据。  相似文献   

泰安市泰山区徐家楼强化土地监管的经验     

张广安  王坤  张伟 《山东地质》2010,(4):34-35,38

泰安市泰山区积极探索强化动态巡查,有效发现制止违法用地行为,组织联合执法,把各种国土资源违法行为消灭在萌芽状态。组建国土城建联合执法中队,采用及时发现、快速制止、依法拆除的有效手段;组建国土资源信息协管员队伍,以形成耕地保护网络组织;组建泰山国土资源保护青年志愿者队伍,以带动广大青年积极参与国土资源管理工作,有效形成了国土资源监管共同责任机制,延伸了国土资源管理的触角,共同营造了珍爱国土、保护耕地的良好氛围。  相似文献   

Inter-decadal Variability in Phytoplankton Community in the Middle Adriatic (Kaštela Bay) in Relation to the North Atlantic Oscillation     

Živana Ninčević Gladan  Ivona Marasović  Branka Grbec  Sanda Skejić  Mia Bužančić  Grozdan Kušpilić  Slavica Matijević  Frano Matić 《Estuaries and Coasts》2010,33(2):376-383

Evaluation of a 45-year data set of primary production (PP), a 30-year data set of phytoplankton biomass, and a 51-year data set of species composition shows an increase of phytoplankton biomass and abundance in the period from the mid-1980s to the mid-1990s. Phytoplankton biomass showed bimodal seasonal cycles, with winter and spring maxima, which did not change over the past 30 years. Diatoms were the most abundant functional group and they prevailed during the colder part of the year while the dinoflagellate contribution to the phytoplankton community increased in the warmer period from May to August. Diatoms showed a significant negative correlation with sea surface temperature (SST), while dinoflagellates were positively correlated with SST. An increase of phytoplankton abundance, particularly dinoflagellate, in the period from the mid-1980s to the mid-1990s coincided with years characterized by a high North Atlantic Oscillation (NAO) index. Primary production and chlorophyll a concentration in the spring period were negatively correlated with the NAO winter (DJFM) index, probably caused by increased precipitation associated with a low or negative NAO index. PP in winter during the mixing period was positively related to the NAO winter index associated with higher temperatures and dry conditions which brought more clear days and increased input of solar radiation.  相似文献   

Integrated seismic hazard evaluation and disaster management approach for Turkey     

Kasım Armağan Korkmaz 《Environmental Earth Sciences》2010,61(3):467-476

A significant proportion of the urban areas in Turkey is subject to high seismic risk. An important step for seismic risk mitigation is to define the hazard and damage after an earthquake. This paper proposes an integrated seismic hazard assessment and disaster management processes for Turkey. The proposed methodology utilizes information technologies in its seismic assessment component that provides fast results for assessment. First, image process methodology by using satellite images was implemented in the seismic assessment process for fast evaluation right after an earthquake. Second, the seismic assessment process was integrated with disaster management process. As a result, through integrated seismic hazard evaluation and disaster management procedure, an effective, fast and dependable estimation of loss for Turkey was planned.  相似文献   

火山碎屑岩储层特征及敏感性——以塔木察格盆地塔南凹陷为例     

郭欣欣  刘立  曲希玉  蒙启安  宋土顺 《东北石油大学学报》2013,(2):72-81,8,9

为了研究火山碎屑岩的储层特征及储层敏感性机理,以塔木察格盆地塔南凹陷铜钵庙组)南屯组火山碎屑岩为对象,运用普通薄片、铸体薄片和扫描电镜等技术,结合储层敏感性实验资料,根据《储层敏感性流动实验评价方法》(SY/T5358-2002),分析火山碎屑岩储层特征及其水敏、盐敏、速敏、碱敏、酸敏的特征和形成机理.结果表明:岩石类型包括凝灰岩、沉凝灰岩和凝灰质砂(砾)岩,主要敏感性黏土矿物有蒙脱石、伊利石、高岭石、绿泥石和伊/蒙混层,属于中低孔特低渗型储层;水敏性强弱与岩石类型关系密切,凝灰质砂(砾)岩水敏为中等偏强)强,凝灰岩和沉凝灰岩水敏为中等偏弱)中等偏强;盐敏程度绝大多数为中等偏强,临界盐度为5.126g/L;速敏为中等偏弱)弱速敏;碱敏为中等偏弱)中等偏强碱敏,临界碱度为7.43;酸敏程度范围较广;水敏程度与黏土矿物总量呈正相关;酸敏程度主要受绿泥石含量影响,酸敏指数与绿泥石含量呈正相关.该研究可为火山碎屑岩油气勘探提供借鉴.  相似文献   

基岩区寻找隐伏矿的地球化学方法:构造地球化学测量     

程志中  袁慧香  彭琳琳  卢国安  贾祥祥  邴明明  林成贵 《地学前缘》2021,28(3):328-337

构造地球化学测量是在基岩出露区发现深部矿化信息的一种较为有效的方法.本文介绍了构造地球化学的一些基本概念和构造地球化学测量方法的发展历程.为解决岩石样(构造岩样)的代表性和均匀性,提出了方格采样法,即在每个采样网格内多点采样组合分析采样方法,采集以构造破碎带物质、裂隙充填物、蚀变岩石、矿化岩石等为主的能反映深部矿化信息...  相似文献   

Laboratory Simulation of Vertical Hydrocarbon Microseepage     

WANG Guojian  an  CHENG Tongjin  FAN Ming  REN Chun  CHEN Weijun 《《地质学报》英文版》2011,85(1):223-232

Based on a conceptual model of hydrocarbon microseepage, a macro-sized experimental equipment used the matched mixtures of cement and quartz sand as simulated caprock and its overlying strata is first set up to simulate the processes of hydrocarbon microseepage and its near-surface expressions. The results of the simulation experiments suggest that simulated caprock and its overlying strata have a certain sealed capability; hydrocarbon microseepage is dominated by the pressure of point gas source, and temperature plays only a subordinate role; on the path of hydrocarbon microseepage, the distribution of hydrocarbon concentration is fan-shaped; differential adsorption of alkanes by the simulated caprock and its overlying strata results in the occurrence of a chromatographic effect. Different migrating patterns within simulated caprock are shown by the ratio of i-butane to n-butane. The concentration of hydrocarbon in the surface soil has good correspondence with the pressure of point gas source. These simulation results are significant to further study of the mechanism of anomalies recovered in surface geochemistry exploration.  相似文献