试论如何依法管理地震科技档案     

贺建平 《山西地震》2007,(2):47-48

对地震科技档案目前在收集、接收等常规管理中存在的问题和如何解决这些问题进行了详细论述。认为,只有实现了档案材料形成积累和收集整理过程的一体化,才可保障档案材料的齐全完整,实现依法管理。  相似文献   

Turbidite bed thickness distributions: methods and pitfalls of analysis and modelling     

ZOLTÁN SYLVESTER 《Sedimentology》2007,54(4):847-870

Turbidite bed thickness distributions are often interpreted in terms of power laws, even when there are significant departures from a single straight line on a log–log exceedence probability plot. Alternatively, these distributions have been described by a lognormal mixture model. Statistical methods used to analyse and distinguish the two models (power law and lognormal mixture) are presented here. In addition, the shortcomings of some frequently applied techniques are discussed, using a new data set from the Tarcău Sandstone of the East Carpathians, Romania, and published data from the Marnoso‐Arenacea Formation of Italy. Log–log exceedence plots and least squares fitting by themselves are inappropriate tools for the analysis of bed thickness distributions; they must be accompanied by the assessment of other types of diagrams (cumulative probability, histogram of log‐transformed values, q–q plots) and the use of a measure of goodness‐of‐fit other than R², such as the chi‐square or the Kolmogorov–Smirnov statistics. When interpreting data that do not follow a single straight line on a log–log exceedence plot, it is important to take into account that ‘segmented’ power laws are not simple mixtures of power law populations with arbitrary parameters. Although a simple model of flow confinement does result in segmented plots at the centre of a basin, the segmented shape of the exceedence curve breaks down as the sampling location moves away from the basin centre. The lognormal mixture model is a sedimentologically intuitive alternative to the power law distribution. The expectation–maximization algorithm can be used to estimate the parameters and thus to model lognormal bed thickness mixtures. Taking into account these observations, the bed thickness data from the Tarcău Sandstone are best described by a lognormal mixture model with two components. Compared with the Marnoso‐Arenacea Formation, in which bed thicknesses of thin beds have a larger variability than thicknesses of the thicker beds, the thinner‐bedded population of the Tarcău Sandstone has a lower variability than the thicker‐bedded population. Such differences might reflect contrasting depositional settings, such as the difference between channel levées and basin plains.  相似文献   

浙东南火山银矿成矿规律     

邱鸿坤  梁修睦 《浙江国土资源》1998,(1)

本文综合了以往有关勘查和研究成果,总结浙江省江山—绍兴深断裂以南中生代火山岩区火山银矿床、点的时空分布、中型银矿床定位、成矿物质来源、成矿温度、矿石有用组分的垂直分带、矿物垂直分带、近矿围岩蚀变分带、矿体原生晕、稳定同位素、火山岩下的基本底物质组成差异与银矿的成矿关系等统计规律与成矿系列,认为浙东南火山岩区仍有良好的火山银（金、铅锌）矿找矿远景。  相似文献   

Land rights in conservation areas in Tanzania     

Ulrike Wanitzek  Harald Sippel 《GeoJournal》1998,46(2):113-128

Conflicts arise increasingly in Tanzania which involve claims in land located in conservation areas. These conflicts arise, in many cases, between members of the local communities and the state authorities in charge of the conservation areas. They concern customary land rights both of pastoral and of agricultural communities, a topic which also touches upon their identities. The article investigates the legal dimension of these disputes by discussing the law governing conservation areas in the wider context of land tenure legislation. Within this context, the legal framework of conservation areas is discussed from both historical and contemporary perspectives. Nature conservation must respect the needs of the local population affected. It is therefore argued that concepts of community-based conservation should be developed further to work towards the goal of integrating nature conservation and the sustainable use of natural resources. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

土壤重金属(镉、铅、铜)化学形态的地理分异研究^*   总被引：17，自引：1，他引：16  

罗金发  夏增禄  孟维奇 《地理研究》1998,17(3):265-272

文章以我国9种主要类型土壤和同一地域的棕壤和四种褐土亚类以及红壤带中的非地带性土壤,如酸、中、石灰性紫色土,探讨了在不同自然地理条件下的土壤中,重金属Cd、Pb、Cu形态赋存状态及形态的分异特征,如土壤Pb的水溶态、交换态和弱结合态的相对百分含量随土壤地理带的分布,具南高北低、东高西低的分异规律。而同一地域各亚类的土壤间差异相对较微小。也探讨了土壤性质,如pH值、有机质与土壤重金属形态区域分异的关系,从而揭示了土壤重金属Pb等元素的形态在南北和东西方向土壤序列中的区域性分异规律。  相似文献   

经济工作的主观愿望与客观实践     

张忠林 《吉林地质》1998,17(1):97-100

实践观点是马克思列宁主义认识论的第一和基本的观点。在经济工作中,坚持实事求是和一切从实际出发的工作作风和思想方法,按经济规律办事,勇于实践和探索,以科学的态度、切实可行的方法,追求经济工作的主观愿望与客观实践的完美统一。  相似文献   

The Henry's Law Constants of the Haloacetic Acids     

D. J. Bowden  S. L. Clegg  P. Brimblecombe 《Journal of Atmospheric Chemistry》1998,29(1):85-107

Henry's law constants K_H (mol kg^-1 atm^-1) have been measured between 278.15 K and 308.15 K for the following organic acids: CH₂FCOOH (ln(K_H[298.15 K]) = 11.3 ± 0.2), CH₂ClCOOH (11.59 ± 0.14), CH₂BrCOOH (11.94 ± 0.21), CHF₂COOH (10.32 ± 0.10), CHCl₂COOH (11.69 ± 0.11), CHBr₂COOH (12.33 ± 0.29), CBr₃COOH (12.61 ± 0.21), and CClF₂COOH (10.11 ± 0.12). The variation of K_H with temperature was determined for all acids except CH₂FCOOH and CBr₃COOH, with _r H° for the dissolution reaction ranging from –85.2 ± 2.6 to –57.1 ± 2.5 kJ mol^-1, meaning that their solubility is generally more sensitive to temperature than is the case for the simple carboxylic acids. The Henry's law constants show consistent trends with halogen substitution and, together with their high solubility compared to the parent (acetic) acid (ln(K_H[298.15 K]) = 8.61), present a severe test of current predictive models based upon molecular structure. The solubility of haloacetic acids and strong dissociation at normal pH mean that they will partition almost entirely into cloud and fog in the atmosphere (0.05–1.0 g H₂O m^-3), but can reside in both phases for the liquid water contents typical of aerosols (10^-5-10^-4 g H₂O m^-3).  相似文献   

论民间法对中国少数民族地区环境法制建设的贡献   总被引：1，自引：0，他引：1  

廖华 《云南地理环境研究》2007,19(5):50-54

创始于西方国家的环境法以工业化和民主政治为基础,在工业化程度不高、民主意识欠缺的少数民族地区开展环境法制建设必须尊重当地少数民族的自治权利及社会的法文化传统,发挥民间法对环境法制建设的贡献.因为民间法作为历史文化遗留有巨大的惯性力量,是实际存在于中国现代社会的有效秩序和规范来源.少数民族地区广泛存在的与环境保护相关的民间法能够成为地方环境立法的来源,帮助人们认同国家环境立法,并且弥补国家环境立法的空白,全面细致地规范人们开发利用环境的行为.  相似文献   

苏里格气田西区地层水成因、分布规律与控制因素     

杨仁超  董亮  张吉  王一  樊爱萍 《沉积学报》2022,40(1):267-280

苏里格气田西区气井产水严重,地层水成因、分布规律及控制因素不明确,成为制约该区致密砂岩气开发的关键科学问题.在大量测井数据、生产动态数据收集的基础上,分析了苏里格气田西部地层水性质及地球化学特征,结果发现:地层水矿化度高,整体属于盐水;水型主要为CaCl2型;pH值范围为6～6.9,呈弱酸性.分析认为:1)地层水主要为...  相似文献   

莒县国土资源局信访工作探析     

井富磊  卢守润  王龙增 《山东地质》2010,(2):52-53

莒县国土资源局干部职工通过走进基层、走进群众中间,摸排国土资源信访矛盾,查找信访苗头线索,及时制定应对方案,筑牢接访三道防线,努力将矛盾化解在萌芽状态,信访工作取得明显成效。  相似文献