云南盈江遮坎多金属矿床成矿条件分析

通过分析云南省盈江遮坎多金属矿区区域及矿床地质特征,确定了该矿床为燕山期花岗岩体沿断裂构造、层间滑动构造贯入形成,从岩浆岩条件、构造条件、围岩条件综合分析了该矿床的成矿条件,从而指出了在该区进行下一步找矿的找矿标志。     

尤溪县铁炉亭矿区铅锌矿地质特征及其矿床成因分析

文章通过对铁炉亭矿区地层、区域构造、成矿特征的介绍,阐述该区铅锌矿找矿的思路,总结出区内的找矿标志及成矿类型,并分析该区矿床的成因,对其它铅锌矿区找矿工作有一定的实际意义。     

尤溪县铁炉亭矿区铅锌矿地质特征及其矿床成因分析

文章通过对铁炉亭矿区地层、区域构造、成矿特征的介绍,阐述该区铅锌矿找矿的思路,总结出区内的找矿标志及成矿类型,并分析该区矿床的成因,对其它铅锌矿区找矿工作有一定的实际意义。     

西岭秋喝银多金属矿矿床地质特征及找矿前景分析

西岭秋喝银多金属矿位于鄂拉山中段,是青海省铜、铅、锌、锡、金、银矿的重点规划区之一。长期以来,矿区仅进行金矿的普查工作,工作思路单一、局限性大,虽发现了多处金异常区,但没有实质的突破。通过对区内的以往资料的综合研究分析,结合邻区(索拉沟银多金属矿床)的找矿模式,进行了综合找矿,并取得了一定的突破。但从目前的矿体规模看,均为小矿体,因此能否在已有矿体的周围找到新类型矿床(就矿找矿),在浅成热液矿床或矿化蚀变的深部取得找矿的重大突破十分必要。在此基础上建立了该区的成矿地质特征,并对该区的成矿前景进行了浅析。     

四川省马思罗金矿地质特征及成矿模式研究

"四川省马思罗金矿地质特征及成矿模式研究"为系统查明马思罗金矿的地质特征及矿床成矿模式,争取在成矿理论上取得新的突破来指导下一步找矿与勘查工作。在系统收集研究区内以往所取得成果资料的基础上,通过野外地表和坑道地质观察,应用室内综合研究工作,结合现代成矿理论,研究了马思罗金矿床的区域地质背景、矿床地质等问题,又结合矿床的成矿物质和成矿流体来源研究,探讨了矿床的成因,对该地区的下一步的找矿与勘查工作具有一定的现实指导意义。     

广西大明山钨矿区隐伏斑岩型铜矿找矿前景与新方法

2009年地质勘查工作会上明确指出,必须加强深部找矿工作,以应用深部矿床成矿与找矿理论的突破和先进找矿方法技术为基础,努力实现深部找矿重大突破。近年来我院在大明山钨矿区南段那汉沟、北西段甘高一带开展了多项地质普查工作,在深部的斑岩体内及附近发现了多条合钨、铜石英矿脉。文章结合大明山钨区区域成矿地质背景、岩浆岩构造地质特征,对比癍岩型铜矿床的地质特征及成矿模式,认为大明山矿区外围那汉沟和甘高矿段的铜矿与燕山晚期石英斑岩、花岗斑岩具有成因联系,表现出斑岩型铜矿的特征。有利的地质条件及找矿信息显示本区有较好的找矿前景,通过新一轮的找矿工作,运用新的找矿方法,可望在本区找到大中型隐伏斑岩型铜矿床。     

山峰岭矿区铅锌多金属矿的地质特征和矿床特征分析

山峰岭矿区矿产资源丰富,该矿区由于地处山区,地质结构复杂多变,所以给找矿工作造成严重困难。金属矿区地质结构通常复杂多样,对采矿工作造成严重困难,所以开采之前的地质特征及矿床特征分析是必备的环节。文章就山峰岭矿区铅锌多金属矿的地质特征和矿床特征进行分析,以供参考。     

湖南桃坪矿区某矿段铅锌矿成矿条件浅析

桃坪矿区位我国著名的北东向跨省金多金属成矿区带———钦杭成矿带中。文章通过研究区域成矿地质条件和主要成矿因素,分析了区域成矿远景;对矿区内的地质情况、构造特征及其控矿作用进行研究分析;通过对矿体形态、产状、规模和分布规律等矿床特征分析,综合地球化学特征及区构造岩浆演化特征和构造控矿特点,对该矿床成矿条件进行了研究分析,文章认为该矿床成因类型为中低温热液交代充填铅锌矿床。     

广西隆或金矿地质特征及外围找矿前景

本文通过对隆或金矿区地质背景、矿床地质特征、控矿因素的综合分析,结合成矿地质条件和矿化特征,对本区金矿成因进行了分析,为进一步开展该区及外围的找矿工作提供了理论和实际资料依据。     

黔东松桃下院子大型锰矿床地质特征及深部找矿标志

下院子锰矿产于南华系下统大塘坡组第一段下部,冷水溪犁式正断层(F1)的上盘,矿体呈层状、似层状缓倾斜顺层产出。文章通过对下院子锰矿系统的研究,对本区锰矿提出以下找矿标志:地层标志(大塘坡一段碳质页岩);含锰岩系厚度标志(17 m);沉积相标志(成锰盆地);两界河组的厚度和岩性组合关系(厚度大,岩性组合复杂);构造标志(古断裂);地化标志(Mn/Cr≈40)。     

The Nexus of Population,Energy, Innovation,and Complexity

For the past 200 years, humans have benefited from the abundant, inexpensive, and easily obtained energy of fossil fuels. Energy surpluses such as this are unusual in human history. In systems with little surplus energy, population growth is low and complexity emerges slowly due to the energetic costs it carries. On the rare occasions when energy is readily available, societies respond by growing rapidly. They must become more complex in response to the social, economic, and resource challenges of dense population. More complex societies are more expensive, requiring greater energy per capita. The process of increasing complexity necessitates greater energy production, creating a positive feedback cycle. Past societies have collapsed under such pressures. Population and complexity grew rapidly when the Industrial Revolution replaced economies based on annual solar radiation with economies fueled by fossil energy. The Green Revolution of the 20^th century is credited with preventing mass starvation, but it has made food production and sustaining population ever‐more dependent on high‐energy (low‐entropy) inputs. Some believe innovation will overcome the limitations of resources and permit unchecked growth. However, increases in complexity, innovation, and fossil energy are all subject to diminishing returns, and cannot continue to support population at current levels.     

我国人口资源环境与经济的可持续发展

为了保持经济又好又快的发展,应该正确处理人口、资源、环境与经济的关系;必须长期坚持计划生育的基本国策,控制人口增长的数量,提高人口的质量,减轻过多的人口对资源和环境的压力;提高自主创新能力,转变经济增长方式,发展循环经济,节能减排,建设资源节约型、环境友好型社会,走新型工业化道路,实现可持续发展战略。     

Transversals, systems of distinct representatives, mechanism design, and matching

A transversal generated by a system of distinct representatives (SDR) for a collection of sets consists of an element from each set (its representative) such that the representative uniquely identifies the set it belongs to. Theorem 1 gives a necessary and sufficient condition that an arbitrary collection, finite or infinite, of sets, finite or infinite, have an SDR. The proof is direct, short. A Corollary to Theorem 1 shows explicitly the application to matching problems. In the context of designing decentralized economic mechanisms, it turned out to be important to know when one can construct an SDR for a collection of sets that cover the parameter space characterizing a finite number of economic agents. The condition of Theorem 1 is readily verifiable in that economic context. Theorems 2–5 give different characterizations of situations in which the collection of sets is a partition. This is of interest because partitions have special properties of informational efficiency.     

ICP测定土壤中的K,Na,Ca,Mg,Fe

本论文采用等离子体发射光谱法(ICP-AES)土壤中的K,Na,Ca,Mg,Fe进行了测定,样品以四酸体系溶矿,不经分离杂质,即可直接测定。本法通过优化实验条件确定了最佳分析波长,该测定方法检出限为:0.006~0.0186mg/ml,RSD%为:0.5032%~1.030%,双差均小于1,回收率为99.41%~100%。准确度和精密度较高,方法快速简单,预处理简单,分析流程短,完全满足地质工作要求。     

Structural estimation of caloric intake,exercise, smoking,and obesity

The escalating rate of obesity in the US highlights the importance of understanding the causes for this rise. In this paper I employ the First, Second, and Third National Health and Nutrition Examination Surveys to estimate a structural model of the determinants of adult obesity. To control for the potential endogeneity of some explanatory variables, such as caloric intake (adjusted for activity level) and smoking, a set of reduced form equations for these outcomes is estimated simultaneously with the obesity equation. To identify each equation, I use an array of state-level characteristics as instrumental variables. Trends in these variables shed light on the sources of the rapid increase in obesity since 1980.