查询词典 roof

Aiming at bottom roof caving and support impact problems induced with abrupt large scale caving upper roof in face 21303 of Daliuta mine, this paper put forward the motion parameter at roof caving and calculation formula of roof shear breaking force with the help of theorem of momentum, theorem of moment of momentum and D' Alembert principle. Roof caving process was simulated by Ansys Ls-DYNA program, and maxim impact force was got. The theoretical research outcomes in the paper were applied in face 21303 of Daliuta mine, and were accordant with actual observing status of roof caving process.

针对神东煤炭公司大柳塔煤矿活井21303综采工作面，上层采空区顶板突然大规模垮落对下层顶板及支架的突然冲击问题，文章采用动量定理、动量矩定理、达朗伯原理推出了顶板垮落瞬间的运动量及顶板切顶垮落所需要的剪力值计算公式，用ANSYS LS-DYNA程序对顶板垮落过程进行了数值计算，得到了最大冲击力，在大柳塔煤矿活井21303综采工作面对顶板垮落特征进行了实际观测和理论成果验证。

Common form of the roof surface: arch roof , shell-shaped roof of shoes, V-shaped hull roof , flat roof shell, wheel-shaped cable roof , saddle -shaped roof .

曲面屋顶常见形式有：拱屋顶、球鞋形网壳屋顶、V 形壳屋顶、扁壳屋顶、车轮形悬索屋顶、鞍形屋顶。

The cast-in-place reinforced concrete spatial core beamless roof is one kind of new beamless roof system, it is self-possessed lightly, the span is big, after is continues the belt capital of column the beamless roof, the plate beamless roof, the dense rib beamless roof, complies with the time to the beamless roof system request new beamless roof system, at present already entered the use in some engineering project upthrow, has obtained the good economic efficiency and the social efficiency.

现浇钢筋混凝土空心板无梁楼盖是一种新型的无梁楼盖体系，它自重轻，跨度大，是继带柱帽的无梁楼盖、平板无梁楼盖、密肋无梁楼盖之后，顺应了时代对无梁楼盖体系要求的新型无梁楼盖体系，目前已经在一些工程项目上投入使用，取得了良好的经济效益和社会效益。

The trial results show that with the disposal of induced caving roof by presplitting blasting and induced caving roof blasting, about 17.8 m in thickness of rock cushion is successfully formed in the inferior abandoned stope, which can bring down the harm of dashing blast of an explosion caused by roof collapse; apparent run-through flaws arise between presplitting blasting holes, and controllable caving is formed in the roof, abrupt collapse of large area roof is prevented, the productional safe surroundings of underground mining is improved; eventually, the resources' reclamation rate is improved from about 70% to 84.6%, and the dilution rate is abated from 25%40% to below 15%, so efficiently withdrawing is actualized.

试验结果表明：采用预裂爆破与诱导崩顶爆破的方法，通过对顶板的诱导崩落处理，成功地在下方采空区形成了厚度为17.8 m左右的岩石缓冲垫层，有效地降低顶板冒落带来的冲击气浪危害；在预裂孔间产生明显的贯通裂隙，从而在顶板上形成诱导可控崩落，防止顶板大面积的突然垮落，改善地下开采安全生产环境；最终资源的回收率由70%左右提高到84.6%，贫化率由25%~40%降低到15%以下，实现了资源的高效回收。

George writes: To get an idea of the crowds, here are our bivuoac sites and the total number of climbers sleeping on them that night: El Cap Tower (7 people), Camp 4 (5 people), Camp 5 (7 people). A party of 3 very slow Japanese ahead of us caused many problems because it took them 6 days to climb the route. Everyone was snarling below them. For example, we reached Camp 4 fairly early, but the Japanese were at the great roof having started that day from Camp 4!!

George写说：『要晓得人数概念，这里有些我们过夜处和人数的资料： El Cap Tower，第四营，第五营，有个三人的日本队伍在我们前头且爬得很慢造成很多问题，因为他们要花六天的时间爬这条路线，每个人在他们后面纠结住了；譬如我们到达第四营相当早，但日本人在 great roof

George writes: To get an idea of the crowds, here are our bivuoac sites and the total number of climbers sleeping on them that night: El Cap Tower (7 people), Camp 4 (5 people), Camp 5 (7 people). A party of 3 very slow Japanese ahead of us caused many problems because it took them 6 days to climb the route. Everyone was snarling below them. For example, we reached Camp 4 fairly early, but the Japanese were at the great roof having started that day from Camp 4!!

George写说：『要晓得人数概念，这埵钓ロ畯拊L夜处和人数的资料： El Cap Tower，第四营，第五营，有个三人的日本队伍在我们前头且爬得很慢造成很多问题，因为他们要花六天的时间爬这条路线，每个人在他们后面纠结住了；譬如我们到达第四营相当早，但日本人在 great roof

Discussion on concept design of long span special steel roof structures

钢结构屋面，Steel roof，在线英语词典，英文翻译，专业英语

For two homoatomic Sb42- and Bi42- species, there are three stable isomers: square (D4h), roof-shaped (C2v-1), and C2v-2 structure with the square isomer being the ground state.

计算结果表明Sb42-和Bi42-团簇有三种稳定的结构：正方形(D4h)、屋顶型(roof，C2v-1)和C2v-2结构，其中正方形结构是基态。

For the heteroatomic dian- ionic22- species, there are also three stable isomers: rhombus (D2h), roof-shaped (C1), and C2v structures with the rhombic isomer being the ground state.

由异原子组成的22-团簇也有三种稳定结构：菱形(D4h)、屋顶型(roof，C1)和C2v结构，其中菱形结构是基态。

We would hike to the top of El Capitan, rappel down to the Great Roof for the photo shoot and spend a few extra days checking out the free climbing possibilities on the pitch above Camp Six.

我们将健行到El Capitan的顶站，垂降到Great Roof照相，然后多花一天到第六营上面看是否可能自由攀登而上。

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。