目的：观测颅底非孔裂薄弱区，为颅底骨折及颅内超声探查提供解剖学基础。
Objectives: Through observing skull bottom non-hole crack weak area, to provide anatomy foundation for the ultrasonic investigation in the skull and bone fracture in the skull bottom.
须芒草北美洲须芒草属，孔颖草属和裂稃草属的几种主要的草之一，其中一些为重要的大平原草。
Any of several chiefly North American grasses of the genera Andropogon, Bothriochloa, and Schizachyrium, some of which are important prairie grasses.
在石人沟铁矿的试验结果表明采用垂直深孔预裂爆破技术在该矿是一种可行方案。
The test results show that the technology of vertical deep hole presplitting blast is a feasible method in Shi Rengou Iron Mine.
结果表明，冷扩张过程所引入的切向残余压应力能保持足够的强度，以对钢轨螺栓孔起到显著的防裂和止裂作用。
It is concluded that, the residual stress induced by cold expansion can maintain enough strength to prevent and retard fatigue crack initiation and growth in rail bolt hole.
结果：为全部病例均有患骨的膨胀，并可伴有正常孔、裂、窦腔的变小或消失。
Results: All involved lone shouted expanded and complcated ly decrease or disappearence of nearly hole, fissure or cavity.
上述分析与认识，可以为油气层产能预测及低孔低渗油气层压裂改造决策提供依据。
Those analyses could be used in decision making for fracturing in low porosity and low permeability reservoirs.
通过大量的预裂爆破试验，得出了适用于该边坡的炮孔直径、炮孔间距、线装药密度、不耦合系数等一系列常规预裂爆破参数。
Pre-splitting blasting experiments were carried out to obtain normal pre-splitting blasting parameters such as hole diameter, hole space, gun- powder charge line density, and uncoupling factor.
主要介绍露天深孔大梯段预裂爆破、减震爆破、微差爆破、最大一次装药量的控制措施和关系。
The relationship between the pre-splitting, vibration reduction, millisecond blasting and the maximum single detonating charge in open deep-hole large stage is introduced.
结果为：原岩应力的存在有利于光面爆破的炮孔间贯通裂纹的形成，不利于预裂爆破的炮孔间贯通裂纹的形成。
Results indicate that the residual stress is useful to form the cracks between the shot-holes for smooth blasting, but not for pre-split blasting.
最后，对使用宽孔距的预裂爆破所产生的经济、社会效应进行了评价。
Finally, the economy, the social effect were used to appraise the pre-splitting blasting with wide pitch of holes.
最后总结了现有方法的特点，给出了低孔低渗储层压裂后产能预测的建议。
At last, the characteristic of present methods is summarized and some Suggestions for productivity prediction of the fractured reservoir with low porosity and low permeability are proposed.
针对吉林油田低孔、低渗的特点，开发了适合中等井温的新型无固相压裂液体系。
A novel solid residue-free fracture fluid system suitable to middle well temperature was developed for the geological feature of low porosity and low permeability in Jilin Oilfield.
川中香溪群储层普遍具低孔、低渗特性，大部分井只有通过压裂改造，才能获得商业开发价值。
Xiangxiqun Formation generally has the characteristic of low bore and low permeability in Chuanzhong oil field By fracturing reconstruct, most of Wells have acquired the business value.
采用异形销孔设计将是改变活塞内侧应力集中，提高裙部结构的安全系数，减少活塞裙部裂损的有效方法。
Using a special pin hole in design will be an effective method to change stress concentration on inside of piston, improve safety coefficient of skirt...
长期以来难以控制酸蚀蚓孔对酸化压裂施工造成的不良影响，其主要原因是不明确酸蚀蚓孔发育机理。
The main reason why the bad influence of acid wormhole on acid fracturing execution is hardly controlled in a long time, is that we do not master the acid wormhole propagation mechanism.
有必要针对中孔低渗油藏的地质特征开展提高压裂效果的理论与技术研究。
It is necessary to do some research into the fracturing theory and technology of medium porosity and low permeability reservoirs to enhance stimulation effects.
预裂爆破对爆孔上部岩体影响较大。
Presplit blasting mainly affects the upper part of rock mass.
在现场地应力测量过程中发现了岩芯饼裂、钻孔径缩和钻孔破碎塌孔等现象，分析了这些现象的力学机理。
During course of in situ stress measurement, some problems such as core discing, minification and caving of borehole due to horizontal stress are appeared, and their mechanism is studied.
煤层深孔预裂爆破近年来在瓦斯抽放中运用日益增多，但目前对其爆破理论研究较少。
The technique of deep-hole presplitting blasting in coal bed is widely used for gas predrainage recently; but its blasting theory is not clear up to now.
为提高炮采面块煤率 ，提出了松动预裂微差爆破的落煤方案 ，并对布孔参数和爆破参数进行了调整。
To increase lump coal ratio in stopes, a scheme is put forward for coal falling by loose pre-shearing millisecond blasting, and hole arrangement parameters and blasting parameters are adjusted.
彩南油田九井区储层属于中孔特低渗储层，为了形成产能进行了整体压裂。
The reservoir in well block 9 is middle porosity and specially low permeability one, fracturing was implemented in order to builds up productivity.
针对混凝土竖孔空心砌块存在的热、渗、裂等问题，本文提出并研究了一种混凝土横孔空心砌块。
There are many problems existing in the engineering application of concrete vertical-hole hollow block masonry, for instance poor thermal insulation, seepage and crack.
针对混凝土竖孔空心砌块存在的热、渗、裂等问题，本文提出并研究了一种混凝土横孔空心砌块。
There are many problems existing in the engineering application of concrete vertical-hole hollow block masonry, for instance poor thermal insulation, seepage and crack.
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