地下金属矿山开采技术发展趋势探索

随着现代高新技术水平的不断提升，世界范围内的矿业发展和挖掘均获得全新的发展机遇，现阶段，各国矿业发展均高度依赖于科技的发展和进步。与国际相比，我国在进行矿产开采时，对于高科技开采技术的应用依赖度极高。为此，本次研究中以地下金属矿山的开采为例，分析了开采技术的未来发展趋势，旨在借此为相关人员提供参考。     

我国与西方各国的黄金开采状况比较研究

从我国和西方各国在黄金开采状况：产量增长状况、资源条件、开采技术与装备条件、经营管理与效益等方面进行了较详细的比较，并指出了开采技术的发展趋势与提高效益的途径，对我国的黄金工业具有指导意义．     

采用深孔水力开采技术对金山店铁矿东区进行开采的探讨

在介绍深不力开采技术的一般概念后，对金山店铁矿松软矿体应用该技术开采的可能性作了探讨，提出了采矿方法方案并对金山店东区使用该法的开拓形要主要工艺流程提出了方案设想，显示了该技术的极大技术经济效益。     

矿山开采地面沉降观测技术的应用策略

随着当今社会经济与科学技术的协同发展，各种先进的技术也开始在矿山开采工作中得到了广泛应用。尤其是地面沉降观测技术，更是在矿山开采工作中发挥出了关键的应用优势。为实现地面沉降观测技术在矿山开采中的良好应用，本文特对其应用策略进行分析，包括矿山开采中的地面沉降主要原因、地面沉降观测技术主要要求以及地面沉降技术的应用。希望通过本次的分析，可以让地面沉降观测技术在矿山开采作业中发挥出更好的应用优势，从而实现矿山开采作业质量、效率及其安全性的良好保障。     

深海多金属结核采集方法的经济评价

本文为“深海多金属结核采集方法的技术评价”《湖南有色金属》，Ｎｏ．６，１９９４）的姊妹篇，扼要介绍了太平洋Ｃ—Ｃ区锰结核资源，并分析了现有开采方法的经济可行性。对选择深海采矿方法、确立科研工作的主攻方向具有指导意义。     

井下开采贫损率指标的合理确定及实践

通过对黄沙坪矿近几年来技术经济指标、采掘选成本的统计分析，结合有关经济技术与采选成本的经验公式，以实现企业最佳经济效益为原则，确定出企业的现有技术、管理水平下合理的贫化与损失指标，通过在生产实践过程中的运用得以证明，并且总结了该矿在狠抓贫损管理、提高出矿品位良好企业效益方面的管理措施。     

地下矿山连续开采技术研究进展

本文简要介绍了地下矿山连续开采的概念，分析了国内外地下矿山连续开采技术的研究进展，展望了我国地下矿山连续开采技术的发展方向．     

浅析黄金矿山深部开采技术

随着科技的发展,我国的经济也随之发展,传统的金矿深部开采模式也得到了改善和提升。先进的技术和设备,不仅能有效提高井下采矿效率,还能有效保障采场工作人员的人身安全。本文我们将在综合讨论我国金矿地下开采技术现状和发展的基础上,对一些黄金矿山深部开采方法的选择及深部开采技术进行探究。     

铜绿山矿地下开采采矿方法探讨

本文根据铜绿山矿井下开采对象Ⅲ″、Ⅳ″、Ⅺ″及矿体的产状和开采技术条件，结合该矿胶结充填采矿技术现状、二期工程修改设计以及国内外采矿技术的发展，探讨了高效安全和经济合理开采井下各矿体的采矿技术。     

论我国目前黄金矿业开采现状及发展方向

通过对我国目前黄金矿山开采的技术分析、资源的合理开发利用及设备工艺的应用，探讨了采矿技术的发展方向。     

董东矿沿空留巷切顶卸压对底板受力影响分析

以董东矿50107工作面为研究对象,通过数值模拟软件FLAC3D建立模型,对比分析窄矿柱、宽矿柱以及切顶沿空留巷情况下围岩及底板受力特征,确定切顶沿空留巷切顶对围岩的卸压作用。对比分析围岩受力情况,表明切顶沿空留巷卸压效果比较明显,对比分析围岩塑性区的底板破坏深度,表明有利于切顶沿空留巷卸压效果明显,切顶沿空留巷有很好的卸压效果,有利于矿山巷道围岩控制。     

销钉根部裂纹产生原因分析

对TP304H钢管螺柱焊销钉根部产生的裂纹进行分析,寻找裂纹产生的原因并提出改进的方案。     

矿山地质构造沉降监测中水工环地质调查的作用分析

为了保障矿山企业的发展与矿山地质自然环境形成协调的发展模式,应对矿山深层水位的沉降进行检测,水工环地质调查是确定矿山地下水位深度的有效手段之一。基于此,开展对矿山地质构造沉降监测中水工环地质调查的作用分析研究,通过研究得出,水工环地质调查可以提高矿山地质构造沉降监测结果精准度、为矿山地质构造沉降提供应急方案、保障矿山地质构造沉降监测工作效率等作用,对实现矿山企业的精细化施工提供有利条件。     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.     

加强烧结过程控制与稳定烧结矿质量

烧结矿的金属性能包括机械强度、氧化还原性和强度稳定性项指标,而影响这些因素种类繁多、错中复杂。介绍了烧结厂通过加强对烧结全过程的控制,稳定烧结矿金属质量的方法和效果。     

铸造起重机端梁铰接轴联接固定结构的改进设计

八钢二炼钢区域的大吨位冶金铸造起重机为四梁四轨双小车结构,在使用过程中出现连接固定失效、铰接轴非正常磨损的情况。起重机端梁铰接点连接失效会造成起重机主梁与副梁分离的严重设备事故。介绍了对原设计的结构方式进行的改进设计,改进后消除了铰接连接失效的事故隐患。     

Structure of the attachment of the vocal ligament to the perichondrium of the thyroid cartilage

The ventral attachement of the ligamentum vocale of eleven larynges (new-born and adults has been studied in sagittal, frontal and horizontal sections. 1. Supplementary to the known structure of the ventral attachement of the ligamentum vocale we have noticed collagen fibers which ascend in the inner angle of the thyroid cartilage and which partly cross to the other side. Sometimes a few fibers which are running downward have been observed. This structure of the attachement must be more firm than the known structure. 2. Moreover it has been observed that a lot of the angles of the crossing collagen fibers in the cartilage of the lamina mediana (near the attachement of the ligamentum vocale) are right-angled, whereas the angles of the fibers which lie in the laminae laterales in their majority are acute-angled. This phenomenon also is interpreted as a structure which makes the lamina mediana firmer. The fact, that this structure is not so evident in the specimens of the new-born as in those of the adults indicates that there are postnatal changes in the structure of the lamina mediana.     

纳米SiO2含量对铜基摩擦材料摩擦学性能的影响

采用粉末冶金法制备了添加纳米SiO2的铜基粉末冶金摩擦材料,经湿式摩擦材料摩擦性能试验机测试,研究了纳米SiO2添加量对摩擦材料的摩擦系数、磨损率和耐热系数的影响.结果表明:随纳米SiO2质量分数从0增加到1.5%,材料的动摩擦系数先减小后增加,静摩擦系数无明显变化;耐热系数逐步提高;磨损率则先减小后增加;纳米SiO2质量分数为0.75%的材料性能最佳.研究认为:纳米SiO2对铜基湿式摩擦材料的摩擦学性能有显著影响,添加适量的纳米SiO2可使材料具有高而稳定的摩擦系数、优异的耐磨性和耐热性等综合性能.     

抛光时间和表面粗糙度对硬度测试数据的影响

本文讨论抛光时间和表面粗糙度对金属材料布氏硬度测试数据的影响。试验结果指出,随着样品抛光时间的延长,HB值波浪式地变化;随着表面粗糙度的降低,HB值逐渐变小。分析指出,前者与抛光过程中磨面金属的加工硬化和随后的消失、及其循环往复有关;后者则是由表面粗糙度降低后,磨面上加工硬化层的减薄引起的。上述变化规律还受金属材料原始硬度的明显影响。