Using the new definition of factor M2, the propagation of chromatic beams can be analyzed by the beam propagation factor M2 as same as that of monochromatic beams. 利用单色光束传输特性的研究方法,我们可以通过新定义的彩色光束M2因子来研究彩色光束的传输特性。
The Beam Propagation Factor and the Focal Shift of Truncated Gaussian Beams 截断高斯光束的光束传输因子和焦移
The generalized beam propagation factor ( M G 2 factor) of circularly symmetric truncated Laguerre-Gaussian beams is studied using the generalized truncated second-order moments method. 用广义截断二阶矩方法对截断圆对称拉盖尔高斯光束的广义光束传输因子(MG2因子)作了研究,得到了MG2因子的解析公式,并用数值计算例作了说明。
The mechanical conditions of joint propagation are determined by stress intensity factor and the length of damage and strain localization zone. 利用裂纹尖端的应力强度因子、损伤局部化区的长度确定了节理扩展和贯通的力学条件。
The results show that the curves of crack propagation velocity vs stress intensity factor have typical two-stage characteristics. In the first stage, crack growth velocity ( da/ dt) does not increase significantly with stress intensity factor K ⅰ. 结果表明该合金的裂纹扩展分两个阶段:在第1阶段中,裂纹扩展速率da/dt随着应力强度因子KⅠ的增加而稍稍增加(室温下)或者不变(100℃时);
The results reveal that both the second-order-moment transversal beam widths follow a simple hyperbolic law for propagation. The analytical expression of the beam propagation factor is presented. 结果表明,基于二阶矩定义的横向光束宽度在光束传播过程中满足简单的双曲线变化规律,并且给出了光束传输因子的解析表达式。
By using Wigner distribution function, the beam combination characteristics of general astigmatic Gaussian beams are studied. The analytical formulas of intensity profiles and beam propagation factor ( M 2) for incoherent and coherent combinations are derived. 利用Wigner分布函数,对复杂像散高斯光束的并合问题进行了详细研究,得到了相干和非相干并合光束的光强分布和M2因子的解析表达式。(2)总论;
On the problems of the beam propagation factor m~ 2 激光光束传输因子M~2的一些问题
The self convergent beam width method is used to study the beam parameter propagation and M 2 factor of two dimensional hard edge diffracted Laguerre Gaussian beams. 将自收敛束宽法用于研究硬边衍射二维拉盖尔高斯光束的光束参数传输规律和M2因子。
The relationships between crack propagation resistant factor K10, the compositions of PMMA organic glasses, and cross-head rates of clamps were determined by conducting tensile testing of centrical notched samples. 测定了有机玻璃的抗裂纹增长因子K(1C)与材料组份、拉力机夹头速度的关系。
Propagation factor m~ 2 of axial coherent superposition of Gaussian beams 轴向相干叠加高斯光束的M~2传输因子
Mixed crack propagation principal stress factor model and ⅰ-ⅲ mode crack propagation 复合型裂纹扩展的主应力因子模型及Ⅰ-Ⅲ复合型裂纹扩展
And the electric properties of the fluid media would determine the propagation factor of the guided wave and affect the distribution state of the electromagnetic field. 油井内流体介质的电性质将决定导波的传播常数,影响电磁场在井的轴向上和横向上的分布状态和波的传播特性。
Design of EMC must be considered from three aspects: reducing intensity of interference source, attenuating propagation factor and enhancing anti-jamming capability of interfered equipment. EMC设计须从减弱干扰源(传导源)强度、衰减传播因子、提高受扰设备抗干扰能力三方面进行综合考虑。
The wavelength-to-characteristic fractural scale ratio is an important factor whether the equivalent medium theory is correct or not, the anisotropic degree decreased when the fracture is water saturated, the fractural density has certain influence on P-wave propagation velocity and attenuation factor. 波长和裂缝特征尺度的比值是等效介质理论能否成立的一个重要因素,裂缝饱和水后各向异性程度下降,裂缝密度对纵波传播速度及衰减因子有一定的影响。
As for the multi-floor propagation environment, the empirical attenuation factor model is introduced in order to provide some references for indoor field strength prediction and mobile network planning in multi-floor buildings. 对多楼层传播环境,给出经验性的衰减因子模型,为工程实践中多层建筑物的室内场强预测和移动网络规划提供参考。
The Fourier amplitude spectrum used in a seismological model can be expressed as a product of source spectrum, propagation path factor and site effect in frequency domain. 在频域内,场地的地震动傅立叶幅值谱,可以表示为震源谱、传播路径影响因子和场地效应的乘积。
The model describes the measure for these uncertainty factors in user authentication procedure. Aiming at some important and especially secure systems needing several authentication mechanisms, this paper gives and demonstrates the parallel propagation formula of authentication trustworthiness factor. 该模型对认证过程存在的不确定性因素给出了度量,针对需要多种认证机制的重要、特殊系统给出了认证可信度因子在多认证机制之间的传播公式,并进行了证明。
For the reasonable-probabilistic safety assessment in entire stress intensity factor range, a probabilistic model was presented for characterizing the random-long fatigue crack propagation rates covering the factor range from threshold to fracture roughness. 为实现在全应力强度因子范围合理进行结构安全性分析,提出了概全门槛值和断裂韧度的随机疲劳长裂纹扩展率的新概率模型。
As multi-path propagation exists on low Rice factor channel, the received signal is a compound signal with time attenuation and propagation delay, fading and ISI ( inter-symbol interference) will occur on the received signals. 由于低莱斯因子信道存在着多径传播,在信道上经多径传播后的接收信号是衰减和时延都随时间变化的各路径信号的合成,所以接收信号会发生衰落和产生码间干扰。
Based on the Wigner distribution function and intensity moments methods, the analytical equations of beam propagation factor ( M 2 factor) and kurtosis parameter ( K parameter) of the resulting beam are derived in the general case. 借助Wigner分布函数和强度矩方法推导出在普遍情况下合成光束M2因子和K参数的解析公式。
Super Gaussian Schell model ( SGSM) beams have been used for describing the flat top beams with partial coherence. The beam propagation factor M 2 factor has been derived. 采用超高斯-谢尔模型光束来描述部分相干平顶光束,推导出光束传输M2因子。
Propagation Affects of Bifid Factor ( Weiweile) to the Growth of Bifidobacterium 双歧因子对双歧杆菌增殖的影响
The beam propagation factor ( M~ 2-factor) is taken as the characteristic parameter of beam quality, and the M~ 2-factor of ChG array beams propagating through atmospheric turbulence is studied. 采用光束传输因子(M~2因子)作为光束质量的评价参数,研究了ChG列阵光束通过大气湍流传输的M~2因子。
For the local dynamic stability of structure, the propagation of stress wave is an important factor. 对于结构局部的动力稳定性,应力波的传播是一个重要因素。
The influence of turbulence on the spreading and beam propagation factor of the partially coherent and fully coherent cosh-Gaussian ( ChG) array beams has been studied in this thesis. 本文研究了湍流对部分和完全相干双曲余弦高斯(ChG)列阵光束扩展和光束传输因子的影响。
Based on the theory of the second intensity moment, the analytic expressions of the far-field divergence angle, near-field divergence angle, waist width and beam propagation factor of non-paraxial Lorentz beams are derived, and the transform characteristics are discussed. 基于光强的二阶矩理论,得出了非傍轴洛伦兹光束的远场发散角、近场发散角、束腰宽度以及光束传输因子的解析表达式,讨论了它们的变换规律。
By ANSYS/ LS-DYNA analyzed the process of the fatigue crack propagation and the factor influenced on crack growth rate, the influencing factor including average cyclic stress. Stress ratio, loading frequency and amplitude changeless. 用ANSYS/LS-DYNA模拟了疲劳裂纹扩展的过程,分析了影响裂纹扩展速率的因素,其影响因素有平均循环应力,应力比,加载频率和变幅等。
First, the calculation of atmospheric attenuation module and the calculation of the propagation factor module are designed. 首先设计了大气衰减计算模块和传播因子计算模块。
The effect of various factors on the pulse propagation is analyzed by introducing a weighting factor in finite-difference time-domain method. Finally, the dispersion regulation mechanism of two-dimensional photonic crystal is investigated. 引入频率权重因子,利用时域有限差分法分析了各种因素对脉冲传输的影响。最后,研究了二维光子晶体的色散调控机制。