吉林省煤炭资源供需形势及对策     

刘颖鑫  吴克平  鲁艳平 《吉林地质》2008,27(3)

煤炭工业可持续发展必须有煤炭资源作为基础和支撑。近年来我省煤炭资源开发强度大,尚未利用资源中可供建井的资源、储量严重不足,受我省煤炭资源聚煤规律、赋存总量、地质条件和主要预测区勘查程度低等条件的限制,资源勘查形势严峻。通过对吉林省煤炭资源开发情况、煤炭供需形势及预测和存在的突出问题进行分析、研究,提出建议和对策以加大、加快地质勘查力度,保证煤炭资源的接续和供给。  相似文献   

我国煤炭资源开发利用中某些问题的探讨   总被引：3，自引：0，他引：3  

罗景一  牛建英 《中国煤田地质》2006,18(3):6-10

针对我国煤炭资源开发利用中存在的诸如煤炭资源的低效率应用、无序开采、生态环境恶化等问题，指出了我国煤炭资源管理法规中存在的问题，提出了加强煤炭资源开发管理、构建煤炭循环经济体系、加大安全投入、加强煤炭矿区环境的治理和保护、健全有偿使用资源法规制度等对策。  相似文献   

河北省煤炭资源勘查及开发现状     

杨森丛 《中国煤田地质》2006,18(4):5-7,10

河北省含煤面积广，煤类齐全，从晚古生代到新生代共有6个聚煤期，是我国主要产煤省之一，根据河北省煤炭资源特征、开发利用情况，指出目前河北省煤炭工业发展中存在的诸如探采比例失调、新建井基地严重不足、后备资源不足等的问题，以及加强煤炭资源管理的建议。  相似文献   

金刚石中分子氢的赋存状态研究   总被引：1，自引：0，他引：1  

杨志军  彭明生 《矿物岩石》2003,23(3):9-12

金刚石中分子氢的定向红外光谱研究表明在垂直于(100),(110)和(111)三个方向上所测得分子氢的浓度是不相同的,且不同样品中的变化趋势也不同,即分子氢在金刚石中的定向性不明显;MNDO法计算结果显示分子氢在金刚石中的稳定程度大小关系依次为沿〈111〉定向的键心与反键心组合(a.b+b.c)〉六角体空隙(H)〉四面体空隙(T1)〉菱形中心(C1＝C2)〉四面体空隙(T2).  相似文献   

Inelastic displacement ratios for evaluation of existing structures     

Jorge Ruiz‐García  Eduardo Miranda 《地震工程与结构动力学》2003,32(8):1237-1258

Results of a detailed statistical study of constant relative strength inelastic displacement ratios to estimate maximum lateral inelastic displacement demands on existing structures from maximum lateral elastic displacement demands are presented. These ratios were computed for single‐degree‐of‐freedom systems with different levels of lateral strength normalized to the strength required to remain elastic when subjected to a relatively large ensemble of recorded earthquake ground motions. Three groups of soil conditions with shear wave velocities higher than 180m/s are considered. The influence of period of vibration, level of lateral yielding strength, site conditions, earthquake magnitude, distance to the source, and strain‐hardening ratio are evaluated and discussed. Mean inelastic displacement ratios and those associated with various percentiles are presented. A special emphasis is given to the dispersion of these ratios. It is concluded that distance to the source has a negligible influence on constant relative strength inelastic displacement ratios. However, for periods smaller than 1s earthquake magnitude and soil conditions have a moderate influence on these ratios. Strain hardening decreases maximum inelastic displacement at a fairly constant rate depending on the level of relative strength for periods of vibration longer than about 1.0s while it decreases maximum inelastic displacement non‐linearly as the period of vibration shortens and as the relative‐strength ratio increases for periods of vibration shorter than 1.0s. Finally, results from non‐linear regression analyses are presented that provide a simplified expression to be used to approximate mean inelastic displacement ratios during the evaluation of existing structures built on firm sites. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

Cyclic tests on large‐scale models of existing bridge piers with rectangular hollow cross‐section     

A. V. Pinto  J. Molina  G. Tsionis 《地震工程与结构动力学》2003,32(13):1995-2012

Cyclic tests on two large‐scale models of existing bridge piers with rectangular hollow cross‐section were performed in the ELSA laboratory. The prototype structure is an existing reinforced concrete highway bridge constructed in Austria in 1975. The piers presented several seismic deficiencies and consequently they showed poor hysteretic behaviour and limited deformation capacity as well as undesirable failure modes that do not comply with the requirements of modern codes for seismic‐resistant structures. Experimental data are compared to numerical and empirical predictions. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

湖南黄金洞金矿毒砂中Au赋存状态的电子探针研究   总被引：1，自引：0，他引：1  

张文兰  胡文宣 《高校地质学报》1997,3(3):256-262

本文利用ＪＸＡ－８８００Ｍ超大型电子探针，以湖南黄金洞金矿含金毒砂为研究对象。利用金特征Ｘ－射线扫描方法和微区含金含量，对不可见金赋存状态的研究方法和温试条件进行了探索，先观察背散射电子图像，排除金在含金矿物毒砂中呈显显微颗粒存在的可能性，继而用ＬｉＦ晶体测定金Ｌ＝８８．７６Ｌａｌ峰位，然后逐渐放大倍数（ｘ３００，ｘ１０００，ｘ５０００，ｘ３００００，ｘ２０００００）进行金特征，Ｘ－射线连续测量，，结果发现金元素总 是均匀分布在重砂中，从而证实了金呈品格金形式存在的推测。  相似文献   

The hydrocarbon generation mechanism and the three-stage type model of hydrocarbon generation for carbonate source rocks   总被引：1，自引：0，他引：1  

Zhaoyun Wang  Keming Cheng 《中国科学D辑(英文版)》1997,40(3):232-238

The diagenetic mechanism and process of carbonate rocks, which is different to that of clastic rocks, decides the existence of different existing state organic matters in carbonate rocks. This has been verified by both the microscopic observation of organic petrology and the analysis of organic geochemistry of many samples. Based on the hydrous pyrolysis simulation experiment of the low-mature carbonate rocks, the contrasting study on the yield and their geochemistry characteristics of different existing state soluble organic matters of a series of various maturity samples shows that the different existing state organic matters make different contributions to hydrocarbon generation during every evolution state. So that, the hydrocarbon generation process of carbonate rocks can be summarized as the following three stages: the first is the direct degradation of biogenic bitumen macromolecules during the immature stage, the second is the thermal degradation of a large amount of kerogen at the mature stage, the last stage is the expulsion or release of inclusion organic matter owing to the increased thermal expansion pressure during the high evolution stage. Part of achievements of the Eighth Five-Year National Science-Technology Key-Task Project “85-102-02-07”.  相似文献   

晋城境内河流污染现状分析及防治对策   总被引：2，自引：0，他引：2  

申富生  任焕莲 《地下水》2004,26(4):242-244,289

以2003年枯水期化验资料为基础,对现状条件下的晋城市地表水环境质量进行了分析评价,并采用综合污染指数法定量地对河流污染程度给予了分析评价,发现地表水体大部分严重污染、地下水也不同程度受到污染,分析了污染原因并提出防治措施.  相似文献   

综合分析技术在微细粒浸染型金矿金赋存状态研究中的应用   总被引：3，自引：0，他引：3  

熊英  林滨兰  郑存江  李谷林  柏全金  杨红霞  胡建平 《岩矿测试》2004,23(1):62-66

采用化学组分分析、物相分析、粒度筛析、X射线面扫描分析、矿物分离分析并结合数理统计分析等综合分析技术对微细粒浸染型金矿进行工艺矿物学研究,较为快速、准确地查明该金精矿金的赋存状态.几种分析方法互为补充,结果吻合.  相似文献