查询词典 seam blasting

Mechanism of blasting effect is specified,and mechanism of directional breaking controlled blasting effect of cutting seam cartridge is analyzed and discussed and dynamic strain for dandification of rock is tested and analyzed.

分析了塑料单向阀的结构特点及工艺要求，介绍了塑料单向阀注射模的结构及工作过程，并重点介绍了该模具的切缝功能，对类似模具的设计有一定的参考作用。

Mechanism of blasting effect is specified, and mechanism of directional breaking controlled blasting effect of cutting seam cartridge is analyzed and discussed and dynamic strain for dandification of rock is tested and analyzed.

分析和讨论了切缝药包定向断裂控制爆破作用机理，及其与光面爆破的对比试验。

We focus on offering a complete list of services, such as industrial workshop consulting,development, design, sales, general contract ,steel construction, industrial equipment and Accessories , Export of Labour ,etc We have an H-STEEL automatic submerged arc welding production line, AV-475 type rolling machine which can do 360 degrees of rolling work with unreeling and double-lock seam roofing panels, straightening, rust removal and sand blasting and other related equipment.

属下的江门共盈钢结构厂、新会共盈机械厂等，面积超过2万平方米，拥有H钢自动埋弧焊接生产线、AV-475型360°度回卷双锁缝合屋面板现场轧制机等专业设备，主要为客户提供钢铁类的建筑构配件、工业设施和产品配套加工服务，包括钢结构、集装箱旅游组合屋的设计、生产加工、安装施工、翻新保养，及金属构配件、夹层平台、塔架、天车梁、H钢、T钢等的订造、加工、出口。

The selection principle of the roof control parmeters is introduced at the blasting caving coal face in three soft coal seam.

介绍了三软不稳定煤层炮采放顶煤工作面顶板控制参数的选择原则。

Mechanism of rock cutting seam cartridge blasting is introduced.

分析和讨论了切缝药包定向断裂控制爆破作用机理，及其与光面爆破的对比试验。

By the measures such as measuring the risk tendency of underground pressure eruption, evaluating risk index of underground pressure eruption, observing electromagnetic radiation, water injection in coal seam, long drill hole blasting, roof broken in gob area etc., realized safe coal production.

近年来鹤岗矿业集团公司的南部5个煤矿相继发生冲击地压现象，且造成不同程度的财产损失，通过采用冲击危险倾向性测试、冲击危险指数评估、电磁辐射观测方法，采用煤体注水、深孔爆破、采空区断顶等解危手段，实现了煤矿的安全生产。

According to two coal mining practics by Xinshan Mine of Hegan Mining Bureau, through economic technique analysis, the article proves that suspend-shift support mining with sublevel caving is superioror to with slice-blasting mining in mining thick coal seam.

根据鹤岗局兴山矿两种采煤方法的实践比较，通过经济技术分析，证明开采厚煤层选用悬移支架放顶煤比分层炮采优越。

The paper introduces roof control methods of goaf of large mining height fully-mechanized face by artificial forced caving with deep-hole blasting at seam 14 of Silaogou Mine and analyzes the effect.

介绍大同煤矿集团公司四老沟矿14#层404盘区8402大采高综采工作面人工强制深孔爆破处理采空区顶板的技术，并对其效果进行了分析。

Through methane simulation experiment on ignition and blasting due to seam roof rock friction in Qinshui Coal Mining District of Yangcheng, it is shown that sparks will be generated through friction while caving ,causing gas and water mixture to fire, it is big hidden sources which cause methane blasting accident in goaf.

通过对阳城沁水矿区煤层顶板岩石相互摩擦引燃引爆瓦斯模拟实验，得出&岩石在冒落过程中相互撞击摩擦产生火花，可能引起瓦斯与空气混合物着火，是造成采空区瓦斯爆炸事故引爆源&的结论。

Using RFPA2D-Flow stereo-gasses coupled system to simulate the process of gas draiange in lower air permeability coal seam by loose blasting,it interprets that loose blasting is a effective ways to increase air permeability in low air permeability coal seam .

运用RFPA2D-Flow固气耦合系统模拟了松动爆破抽放低透气性煤层内瓦斯的过程，解释了爆破松动是增加低透气性煤层透气性的有效途径，本文对松动爆破前后抽放过程中煤层内瓦斯压力和瓦斯渗流场的变化规律进行了数值模拟对比，为进一步理解瓦斯抽放、松动爆破增透机理等提供理论基础和科学依据。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。