矿山生态修复方法及工程措施研究

近几年,随着社会经济的快速发展,矿区的生态环境恢复已经引起了越来越多的重视。矿山生态修复工程的实施,是防止矿山生态环境持续恶化的一项重大举措。本文从矿山生态修复的方法与工程措施两方面,对其进行了系统的探讨,主要包括矿山生态环境的稳定性、植被的恢复、土壤的生物修复等方面,并对矿山生态修复中的矿山的生态恢复、尾矿库的恢复、煤矸石的生态恢复、排土场的复垦等问题进行了深入的探讨,并总结了矿山生态修复工程的改善策略,从而有效地恢复矿区生态环境,实现矿山生态环境的持续、健康发展。     

矿山生态环境恢复治理存在的困境及优化分析

本文主要对矿山生态环境恢复治理存在的困境及优化进行了研究,运用了文献调查法、资料收集法等研究方法,分析了矿山生态环境恢复治理存在的困境,结合相关现状提出一系列矿山生态环境恢复治理优化策略,包括明确治理目标、提升采矿业环保水平、借助民间力量强化矿山治理、积极构建开发式治理模式等。     

有色矿山景观恢复治理的国际案例借鉴与启示

有色矿山的景观恢复治理是改善矿山生态环境、合理利用矿山遗迹资源、实现废旧矿山功能价值的有效途径.通过分析美国、澳大利亚等西方国家在有色矿山景观治理方面的典型案例,总结矿山遗迹资源景观恢复的国际经验,并对我国废旧矿山的景观治理现状进行了简要梳理,分析了我国在矿山景观恢复方面存在的问题,认为目前我国的矿山景观恢复建成项目存在特色不明显和景观形式单一化等问题,最后从宣传力度、法律政策、原始景观利用、景观形式以及技术水平5个方面对我国有色矿山的景观恢复治理提出建议与对策.      

东坡煤矿矸石场生态恢复治理措施

对矸石场采取了灭火、挡护、边坡防护、平台整治、排水等工程措施及植被恢复措施,消除了矸石场安全隐患,恢复了矸石场的生态环境,本工程作为矿山生态环境恢复治理示范工程,以期为类似矸石场生态恢复治理工程提供借鉴。     

舞钢1260m3高炉长休风恢复炉况总结

对舞钢1 260 m~3高炉长休风及炉况恢复过程进行了总结。对休风前炉况和休风料的加入、休风过程的控制及复风后炉况的恢复过程进行了分析概述,并对本次长休风过程存在的焦比添加量较少、锰矿配吃较多、风口堵砖原则性失误等因素对高炉恢复生产的不利影响进行了分析,为以后的长休风过程及炉况恢复积累了丰富的经验。     

新建吕东沟钒矿生态环境恢复治理研究

在坚持“矿产资源开发利用与生态环境恢复并举”的原则基础上,以陕西省山阳县新建吕东沟钒矿的生态环境恢复治理为背景,开展了新建吕东沟钒矿生态环境恢复治理项目研究,进而提出了通过生物、工程、信息化和管理等措施为主的生态环境保护与恢复治理方案,通过科学、有序、合理的开发利用矿山资源,对开采造成的生态破坏失衡予以最大限度的恢复治理,为矿产资源开发与社会经济的协同高质量发展起到促进作用。     

环境影响评估方法对矿山地质环境恢复治理方案的影响

矿山开发所带来的破坏地形地貌、矿区异质性增强等地质环境问题急需恢复治理,环境影响评估能够对破坏情况加以评估与预测。为研究其影响效果,提出环境影响评估方法对矿山地质环境恢复治理方案的影响分析。通过对典型矿山地质环境恢复治理的分析,总结出影响效果及作用,以促进矿山地质环境恢复与综合治理的开展。     

某退出金矿地质环境影响评估与治理

为保护区域生态环境,对某退出金矿开展地质环境影响评估与治理。通过对矿山地质灾害、含水层破坏、地形地貌、水土环境污染等进行现状分析与预测评估,确定矿山地质环境影响程度,并采取了针对性治理措施,包括尾渣的无害化处置与渗滤液达标处理,覆土复绿恢复原有生态,采探矿场地采矿井的封堵,露天采坑的回填、整形及复垦等。该退出金矿生态环境恢复治理效果良好,可为类似矿山地质环境的治理和恢复提供借鉴和参考。     

武钢2、3号高炉中修开炉之比较

从原燃料质量、开炉操作等几个方面对武钢2、3号高炉中修开炉进行了比较,对2号高炉开炉恢复顺利及3号高炉送风初期恢复困难的原因进行了分析,为以后高炉的中修开炉提供了较好的经验。     

攀钢2号高炉长期休风后炉况快速恢复实践

对攀钢2号高炉,炉顶2米绳轮平台座子坍塌事故重负荷长期休风后,复风炉况快速恢复进行了总结。复风前根据炉况做了详尽的准备工作,复风时采取了使用优质的三期焦炭、提高炉温、稳定顺行、杜绝炉前事故等措施,缩短了恢复时间,实现了快速恢复炉况。     

国外尾矿坝安全与环境研究综述

安全与环境一直是国外尾矿坝研究的重点。笔者综述了自1990年以来国外涉及尾矿坝安全与环境方面有代表性的文献 ,内容包括尾矿坝溃坝、溃坝理论研究、安全管理、环境污染、污染监测、污染治理、污染理论研究及生态复垦 ,这些对提高我国尾矿坝管理、工程技术水平都有较好的参考价值     

榆钢1^#高炉快速复风实践

长期休风后能否快速全风作业是炉况成功恢复的关键。本文通过总结高炉长期休风前的准备及炉况恢复过程和失误,寻找了一种快速恢复炉况的方法。从而为钟式炉顶高炉更换大钟后快速恢复炉况奠定实践基础。     

浅谈球磨机轴承座走外圈的修复方法

指出了球磨机轴承座走外圈的原因,阐述了传统机加工修复及采用新型修补剂修复的两种修复方法,并对其技术经济作了分析,为大型设备备件的修复提供了新思路．     

System Identification of Base-Isolated Building using Seismic Response Data

Due to the complex nature of the excitation, and the inherent dynamics characteristics of restoring force of the base isolation systems, the response of base-isolated structures subject to strong earthquakes often experiences excursion into the inelastic range. Therefore, in designing base-isolated structures, the nonlinear hysteretic restoring force model of the base isolation system is frequently used to predict structural response and to evaluate structural safety. In this paper, the prediction error method system identification technique is used in conjunction with nonlinear state-space models for identification of a base-isolated structure. Using a variety of nonlinear restoring force models and bidirectional recorded seismic responses, several identification runs are conducted to evaluate the accuracy of the selected models. Several nonlinear restoring force models are utilized for the base-isolation system, including a multiple shear spring (MSS) model. Among all models used, results indicate that the trilinear hysteretic MSS model closely matches the actual hysteretic restoring force profile and time histories obtained directly from the observed data.     

宝钢3号高炉高煤比条件下快速复风操作实践

宝钢3号高炉实现高煤比操作后焦比大幅度降低，给休风后炉况的恢复带来了一些困难，主要是炉热不足、恢复时间长。为了确保高煤比条件下炉况快速安全恢复，对快速复风操作的可行性进行了探索和实践，取得了一定效果，由高煤比带来的复风困难问题从根本上得到解决，恢复时间明显缩短，复风过程炉热充沛，铁水质量和产量显著提高。     

运用堆焊工艺修复铝电解多功能天车轨道局部压溃

分析铝电解多功能天车轨道接头局部压溃的原因，介绍采用手工堆焊工艺修复方案之全过程。     

The first exon of the rat aldolase C gene is essential for restoring the chromatin structure in transgenic mice

A 13-kb fragment of the rat aldolase C gene contains sufficient information for gene expression. Transgenic mice carrying the 13-kb fragment showed restoration of chromatin structure and tissue-specific, copy number-dependent expression. To localize the regulatory elements responsible for restoring chromatin structure, several mutated constructs were used to produce transgenic mice. Three activities were examined: recreation of DNase hypersensitive sites, restoration of methylation status, and copy number-dependent expression. Deletions of the 3'-flanking region did not affect those activities. Deletion of seven introns affected the mRNA levels but not the restoration of the chromatin structure. The insertion of the LacZ gene into the first exon of the transgene interfered with both the restoration of the chromatin structure and the copy number-dependent expression in transgenic mice. DNase I footprinting assays revealed that brain-specific factors bind to the sequence disrupted by the LacZ insertion. These results suggest that the sequence in the first exon is essential for restoring the chromatin structure of the rat aldolase C gene.     

Nonparametric Identification of Nonlinear Hysteretic Systems

A nonparametric identification method for nonlinear hysteretic systems is presented. Making use of the Duhem hysteresis operator, the multivalued relationship of hysteretic restoring force with respect to displacement and velocity of the phase plane is mapped onto two single-valued surfaces in an appropriate subspace in terms of the state variables of displacement and hysteretic restoring force. The functions describing the surfaces need not be specified in specific expressions, so that both the form and parameters of the functions can be fine-tuned to match experimental results. They are identified by fitting the surfaces with the generalized orthogonal polynomials in terms of displacement and hysteretic restoring force. The proposed method is applied to the modeling of hysteretic behavior of a wire-cable vibration isolator from experimental data. Excellent agreement between the predicted and experimental hysteresis loops is obtained. Based on the established hysteretic model, the dynamic response characteristics of a wire-cable isolation system are evaluated.     

降低还原控制温度改善海绵钛结构的研究与实践

海绵钛结构致密，质硬是海绵钛生产中的一大难题，通过降低还原控制温度的试验，使海绵钛结构得到明显改善。使海绵钛还原生产工艺参数进一步优化。     

Analysis of obstetric complications reported to the National Patient Insurance Association in Finland from 1987 to 1995

OBJECTIVE: To review comparative studies evaluating oral propafenone for restoring sinus rhythm in recent onset atrial fibrillation. DATA SOURCES: A MEDLINE search of the English-language literature (1966 to 1996) along with any referenced articles not identified by MEDLINE. STUDY SELECTION: Because intravenous propafenone is not marketed in Canada, only studies evaluating oral propafenone were included. Studies were selected if they compared oral propafenone with placebo or other antiarrhythmic agents for converting recent onset atrial fibrillation to normal sinus rhythm. DATA SYNTHESIS: Propafenone is often used as a first-line agent for pharmacological cardioversion of atrial fibrillation. In earlier studies, the efficacy of propafenone in restoring sinus rhythm was reported to be low with conversion rates of 6% to 62%. Many of these studies were noncomparative and often included patients with refractory, chronic atrial fibrillation or employed suboptimal doses of propafenone. More recently propafenone has been evaluated in the treatment of recent onset atrial fibrillation by using a single 600 mg oral loading dose. Success rates of 76% at 8 h and 83% at 12 h following the loading dose are reported. The incidence of atrial flutter during active treatment was similar to that with placebo, with the majority exhibiting 2:1 or greater atrioventricular conduction ratios and heart rates 150 beats/min or less. CONCLUSIONS: A single 600 mg oral dose of propafenone is highly effective at restoring sinus rhythm in patients with acute onset atrial fibrillation with few adverse effects. The small studies reviewed cannot lead to definitive conclusions about the safety of propafenone without prior administration of agents for rate control.