采空区体积三角网模型剖面的微积分算法

为了准确获取采空区空间体积,以采空区三维激光扫描系统探测到的原始数据为依据,提出采空区体积的三角网模型微积分算法.算法首先确定模型剖切的主轴方向,用一组等间距平行面对模型进行相切并获得剖面的无序点集,运用所提出的凸包压入法生成采空区剖面的初始边缘轮廓线;再将初始边缘轮廓线内的其他交点添加到剖面中,形成完整的采空区剖面形态;最后利用平面三角形有向面积叠加计算剖面面积,将剖面面积与微小间距进行积分获取采空区的体积.工程应用表明,所研究的采空区体积算法稳定性好,精度高,可实现对复杂采空区体积的有效计算.      

洛坝铅锌矿复杂隐蔽采空区低成本充填治理方案研究

铅锌矿多年来一直沿用空场法开采产生了规模庞大的采空区群,极易诱发大规模地压灾害、引起地表沉降和塌陷。通过深入的采空区分布现状调查,提出了针对性的复杂隐蔽采空区低成本充填治理方案,包括充填系统方案、充填体强度指标、充填配比参数、充填动力方式、充填通道布设方案、充填挡墙构筑、采空区接顶等,为国内复杂隐蔽采空区低成本充填治理提供了典型解决方案和有益借鉴。     

全尾砂胶结充填技术在金属矿山的应用

本文主要对全尾砂胶结充填技术的现状进行有效的分析,通过利用全尾砂胶结的充填工艺对相关参数数据进行有效的确定,随后利用全尾砂胶结进行充填采空区,将尾矿弄至井下以此来降低开采矿区地质带来的灾害。同时还可以进行二次利用矿产资源,减少固体废料后期对环境带来不必要的污染。     

某矿空场法开采嗣后充填采空区稳定性分析

结合某矿采用分段空场法开采,嗣后全尾砂胶结充填采空区的生产实际,利用FLAC-3D软件建立了三维数值模型并进行数值模拟计算,对充填前后采空区围岩应力、位移进行比较分析,揭示了嗣后全尾砂胶结充填对采空区稳定性的影响机理,对类似矿山采空区治理具有重要的指导意义。     

南矿地表移动变形影响及保安矿柱开采安全分析

对锡矿山南矿地表及井下岩移进行了观测研究,利用不同手段判断地表移动的变形量,从而了解充填质量和保安矿柱安全开采的情况,结合本矿山实际情况,利用观测数据来确定采空区上部建筑物的稳定性。     

露天矿山采空区高效治理技术研究

采空区的治理历来是露天矿山安全生产重点、难点,利用采空区作为爆破补偿空间,发挥其多向自由面优势。对浅埋采空区通过顶部强制崩落,侧向抛掷爆破等进行多向充填。对深埋采空区,采用露天深孔爆破与地下VCR法协同爆破,提高爆破质量及散体流动性及采空区充填体稳定性。实践表明,采用一次性采空区爆破充填,可大幅减小后期人工充填工程量和场平工程量,有效降低工程成本和对矿山生产组织的干扰,为后续穿爆、采装工序创造良好的生产条件。     

上向分层充填采矿法尾砂充填体沉缩变形试验研究

尾砂充填体沉缩变形量较大且难于确定。基于大尹格庄金矿水砂充填生产实践,在室内试验测定分级尾砂粒级组成、孔隙率、载荷作用下沉缩变形量的基础上,通过采场内尾砂充填体厚度计算、回采作业前后充填面标高等参数的计算,推算出尾砂充填体最终沉缩率为11.6%。试验结果可为尾砂充填采场的清底标准提供依据,并根据生产需要适当采用胶结充填方式减少采矿贫化损失。     

采空区失稳辨析的RS-CPM方法研究及应用

采空区稳定性受静态和动态等多种因素影响,且破坏机理复杂,为了有效辨识金属矿山采空区危险性等级,研究采取了基于粗糙集和突变级数的采空区危险性辨识（RS-CPM）方法。根据突变级数法将选取影响金属采空区稳定性的6个主要因素,即抗拉强度、泊松比、采空区体积、采空区宽高比、埋藏深度和空区群影响系数等构建起具有3个层次的辨析指标体系。根据粗糙集理论确定各个层次指标的相对重要性并进行排序,运用突变理论计算得到突变级数值,从而实现对采空区危险性的辨析。实际应用表明,该模型的辨析结果与实际情况相吻合,因而为金属矿采空区的危险性辨析提供了一种新方法。     

中厚煤层充填效果模拟分析

结合某矿22-2煤层地质条件,采用COMSOL Multiphysics数值模拟软件,建立了模型,对采空区进行完全不充填、完全充填、"充五留十"和"充十留十"4种不同情况进行数值模拟。当采取完全充填的方式,和"充十留十"的充填方式处理采空区时,可以有效地控制地表下沉量,维持上覆岩层稳定性,起到保护地面建筑的作用。     

采空区处理新技术的理论研究及应用实践

空场采矿法所形成的采空区,当其体积或面积达到一定数量之后,应使用充填、崩落或支撑等方法进行处理。结合河台金矿采矿方法综合试验研究,发明类框架结构支撑空区的处理新技术,经过力学稳定性分析研究后认为,独立小体积采空区是稳定的,在云西矿区首先应用后,提高出矿品位,产生很好效果,现在高村矿区正在推广应用。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.