开采

The paper researched the stress fields and the deformation and breakage characters of wall rock of laneway along the gob about the fully mechanized in deep mine, which establish the theory basis of the wall rock transmogrification of the laneway along the gob.

本文研究了深井综放开采沿空掘巷的围岩的应力场及破坏特征，为探讨沿空掘巷围岩变形奠定了一定的理论基础。

In 1898 alone, several million cubic yards of traprock provided building material for the growth of nearby Manhattan Island, by exploding more than150 tons of dynamite in the mountain rock.

仅1898年就有数吨炸药用来开山取石，数百万立方码的玄武岩被开采运走作为曼哈顿城区的建材。

Currently in the whole world,Beypazari trona solution project is the largest mining engineering with the methods of solution mining and intersected well drilling.

土耳其贝帕扎里天然碱矿采卤工程是目前世界范围内采用对接井水溶开采方法进行采矿的最大规模的天然碱采矿工程。

Carlin is where gold mining began for Newmont. In 1961, Newmont geologists began probing the high desert area around the Tuscarora Mountains in search of finely disseminated gold - gold that could be seen only in a microscope and, thus, had eluded earlier prospectors.

历史概述 Carlin是纽蒙特金矿的发源地。1961年，纽蒙特的地质人员开始在Tuscarora山四周的高沙漠地带寻找细颗粒浸染型金—一种极为细小，只有用显微镜才能看见的金子，所以以往的勘探人员都未能发现。1963年夏季通过钻孔和化验划定了一个 300万盎司的矿床，即使当时的金价每盎司只有35美元，该矿山也具有开采价值。

Analysis is made on the influences of the main constructions in the mine on the roof wall rock and the water containing layer, the ubiety between the roof and the interlayer or relative interlayer, the influence of the water containing layer and exploration drilling on jamb mining. The safety mining depth as well as the height of collapsed belt and the cranny guiding water are calculated. Furthermore, the ANSYS software is adopted to simulate the stability of the cover terrane and the maximum permit exposure area.

分析了矿区内主要构造对顶板围岩及含水层影响、顶板与隔水层和相对隔水层位置关系、含水层及勘探钻孔对矿柱回收的影响；计算了冒落带和导水裂隙高度及安全开采深度；用ANSYS有限元软件模拟了空区上覆岩层稳定性及最大允许暴露面积。

There are many man-made factors relate to it such as the lacking of geohydrological reconnaissance,the unbefitting mining systems,the supervisal and preventions besides the natural geology condition s.

突水事故发生原因，除自然地质条件外，还与矿区水文地质勘探程度不高、开采方法不当以及监测防治不力等人为因素密切相关。

Since any frequent itemset is a subset of a maximal frequent itemset (an itemset is maximal frequent if it has no superset that is frequent), this paper proposes the DMFI (Discovery of Maximal Frequent Itemsets) algorithm for mining all the maximal frequent itemsets from data sets. This algorithm searches the maximal frequent itemsets in data sets from both bottom-up and top-down directions in the meantime. This paper proposes an algorithm that evaluates the boundaries on the support and confidence of uncalculated itemsets by exploiting the information provided by the calculated itemsets.

本文在经典关联规则的基础上，提出了一系列扩展的关联规则开采算法：发现关联规则的难度体现在发现频繁项目集上，事实上最大频繁项目集（其所有的超集都为非频繁项目集的频繁项目集）的集合已经包含了所有的频繁项目集，本文提出一种发现最大频繁项目集的算法DMFI(Discovery Maximal Frequent Itemsets)，该算法采用自底向上和自顶向下相结合的搜索策略对数据空间进行有效的搜索。

Sand control is the most difficult issue faced by operation of the unconsolidated sand reservoirs .

油气井出砂是疏松砂岩油气藏开采的主要矛盾，传统的防砂技术在防砂的同时影响了油气井产能，并且防细粉砂的效果也不理想。

We should remember 1998 as a result of the uncontrolled exploitation of forest resources caused by the floods.

我们应该记得1998年因无节制的开采森林资源而造成的洪涝灾害。

The results show that underground dam with radiation well as the intercepting underflow project play an important role in groundwater exploitation.

通过实际工程的检验表明：地下截水坝配合辐射井这种截潜流工程在地下水开采中具有重要的作用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。