Using the entropy-based width, asymptotic analysis and encircled power in the bucket, the waist width w, far-field divergence angle θ 0 and M2 factors of a truncated flatted Gaussian beam ( FGB) were studied and compared. 使用熵束宽、渐近分析和环围功率法对截断平顶高斯光束的束腰宽度w、远场发散角θ0和M2因子作了比较研究。
Conclusion FgB β-148 and 448 mutational genotypes have impact on Fg concentration, and therefore increase the risk of MCI. 结论FgBβ-148、448基因型发生变异后可通过影响Fg浓度而使此人群发生脑动脉主干支梗塞组的危险性升高。
NA-match was realized in terms of ray optics, and by assuming a fundamental Gaussian beam ( FGB) with same spot size as the Gaussian-like beam, the propagation principle of FGB was used to simplify the optimum design process of lens-coupling system in high power fiber lasers. 本文用几何光学的方法保证数值孔径的匹配,以类高斯光束光斑尺寸作为基模高斯光束束腰,用基模高斯光束传播规律来简化大功率光纤激光器透镜耦合系统的优化设计。
In order to find a new method for studying and analyzing the output beams of TEA CO_2 lasers, according to the FGB theory, the energy density distribution of the measured flat-top beam output by a TEA CO_2 laser was expanded in Hermit-Gauss functions. 为了给研究和分析TEACO2激光器输出光束提供一种新的处理方法,采用FGB理论,对实验测量的一台TEACO2激光器输出的实际平顶型光斑的能量密度分布按厄米-高斯函数进行了展开。
The comparison of the two mathematical-physical models describing flat-topped beams, i. e., the flattened Gaussian beam ( FGB) and flat-topped multi-Gaussian beam ( FMGB) is made. 对描述平顶光束的两种数学物理模型,即平顶多高斯光束(FMGB)和平顶高斯光束(FGB)作了比较,给出了数值计算结果并作了物理分析。
Objective To study the association of beta-fibrinogen ( Fg) gene-148 C/ T and 448 G/ A polymorphisms, plasma Fg concentration, molecular reactivity and the type of cerebral infarction. 目的研究纤维蛋白原(fibrinogen,Fg)浓度、分子聚合功能及FgBβ-148、448基因多态性与脑梗塞类型的关系。
It is shown that two FGB and SGB with the same M 2-factor but different waist width exhibit similar intensity distributions at the position of the equal generalized Fresnel number, as they propagate through an unapertured ABCD optical system. 研究表明,当有相同的M2因子但束宽不同的平顶高斯光束和超高斯光束通过光阑效应可忽略ABCD光学系统传输时,在广义菲涅尔数F相等处有相似的光强分布。
Objective: To study the relationships between the FgB β 448 polymorphisms and their mRNA expression and fibrinogen ( Fg) level in patients with coronary heart disease ( CHD) complicated with or without obstructive sleep apnea-hypopnea syndrome ( OSAHS). 目的:研究冠心病(CHD)合并或不合并阻塞性睡眠呼吸暂停低通气综合征(OSAHS)患者纤维蛋白原(Fg)含量与FgBβ448位点基因多态性及表达的关系。