With Continuous Beam Column Theory, the mechanics features of offset-axes BHA in2-D hole are analyzed. 文章运用纵横弯曲连续梁理论,分析井斜平面二维井眼中的偏轴钻具组合的力学特性。
Probe into Improving Recovery Ratio of Caving Coal at π Steel Beam Caving Coal Face by Deep Hole Pre-Fracture Blasting 深孔预裂爆破提高π型钢梁放顶煤回采率可行探讨
It has been found that a beam of light produced by a laser can burn a hole in a diamond. 人们发现,由激光器产生的一道光束能在金刚石上打孔。
He worked in a darkened room and obtained the beam through a hole in the shutter. 他在黑暗屋子里做实验,从百叶窗的一个小孔处得到了光束。
But a moment later the light beam is blocked until the next hole is in place. 但稍后该光束被阻塞,直到下一下孔转动到这个位置。
Based on construction of large-span post-stressed T-beam, the hole forming technique by adopting high-pressure rubber pipe ( by lossing core) is summarized emphatically, and a feasible arc hole forming technique is found out. 通过大跨径后张法预应力T形梁的施工,重点总结了采用高压橡胶管抽芯法孔道成型工艺,探索出切实可行的弧形孔道成型技术。
When a Gaussian beam is used to drill a small hole, its depth of filed is small. 当高斯激光束用于打小孔时,焦深很小。
When the nodal degrees of freedom in beam element increase from 6 to 8 by the use of Hermit interpolation function, the second derivative for expressing hole curvature becomes continuous, and the calculation precision is improved. 利用二阶埃尔米特插值函数把空间梁单元的结点自由度由6个扩充到8个,使井眼曲线的二阶导数连续,提高了计算精度。
This program can calculate the following: flux, energy spectral, dose ration of neutron and flux, dose ration of photon in pipe, beam hole, gap for research reactor and nuclear power reactor shielding design and analysis. NPDMC程序可以计算各种类型的研究性反应堆和动力堆中的管道、束孔和缝隙的中子通量、能谱、剂量率和γ光子通量及剂量率等。
The computing method of single span wall beam without hole 单跨简支无洞口墙梁内力计算方法
Application of Joint Support of Anchor Craning Beam in Combined Mining Cut Hole 锚索梁联合支护在综采切眼施工中的应用
Electron beam in accelerators can exceed the transferring hole as a result of beam divergence or eccentricity. 加速器内电子束团在传输过程中因束流传输截面发散或偏离中心,会超出尺寸一定的传输器件。
Bending behaviors of single crystalline nano-copper cantilever beam models with hole are simulated by MD using embedded atom potential. 应用分子动力学方法模拟了带孔纳米单晶铜悬臂梁的弯曲过程。
Utilizing convergent beam of large aperture can realize inversion of circular hole diffraction and circular disk diffraction. 利用这种光束可以对微小的衍射物体进行反演放大。
Optimun design of composite tail beam with open hole using FEM method 复合材料尾梁开口区有限元优化设计
Calculation of internal stress of continuous beam having hole in mid of wall by finite element method 有限元法计算开洞连续墙梁的内应力
For the purpose of a contrast analysis, the author made three experimental beams, one was hexagon hole castellated beam and the other two were circular hole castellated beams. 为了做对比研究,笔者还制作了三根试验梁,其中一根六边形孔蜂窝梁和二根圆形孔蜂窝梁。
In the process of duplicate laser boring, the crosswise pattern of laser beam determines the precision of the processing hole's shape and size. 在复制法激光打孔中,激光束的横向模式决定着加工孔的形状和尺寸精度。
The measurement of hel beam far field with hole grating beam sampler 孔栅分束镜测量强激光远场光束质量的研究
Electron beam induced current technique is used to determine the hole diffusion length of N-type substrate at 100K for InSb multi-element arrays with DX-3A SEM. 用DX-3A型扫描电镜,在100K采用EBIC技术确定了InSb多元探测器N型基底的空穴扩散长度。
Dynamic photoelastic research on explosive effects of circular beam hole blasting and equivalent hole blasting 圆型束孔与当量大孔爆破效应的动光弹研究
The effects of average power density, laser frequency, processing times, beam defocus and scanning speed on the drilling hole diameter and the etching entrance width as well as depth of the straight line were analyzed. 研究分析了激光平均功率密度、重复频率、加工次数、光斑离焦量、扫描速度等工艺参数对小孔孔径、直线的线深及线宽入口尺寸的影响规律。
Then base on beam propagation method ( BPM), the characteristics of photonic crystal fiber grating in fiber grating cavity is researched. The effect of the parameters of grating structure and filler in hole on photonic crystal fiber grating has been especially discussed. 利用光束传播法,研究了光纤光栅谐振腔中光子晶体光纤光栅的特性,重点分析了光栅结构参数和空气孔中填充物质对光子晶体光纤光栅的影响。
The discharge mode and variation of plasma parameters are also studied by changing the beam hole downstream the resonance region. 通过改变等离子体束孔大小研究了等离子体放电模式的转变和等离子体参数的变化。
But beam quality of slow axis is easily affected by space burned hole, self-focusing and thermal lens effect, which lead to big slow axis divergent angle under high output power. 然而由于其慢轴方向输出光束质量极易受到空间烧孔、自聚焦、热透镜等效应的影响,致使其在高功率工作条件下,输出的慢轴方向发散角较大。