| 1. | Pib . polyisobuthylene roofing felt with backing ; requirements
带衬料的聚异丁烯 |
| 2. | Standard specification for reinforced white pib sheet used in roofing membrane
屋顶隔板用增强白色pib板材的标准规范 |
| 3. | Pib processor in a box
盒装处理器 |
| 4. | Pib processor in a box
盒装处理器 |
| 5. | Conclusion : [ 11c ] pib - pet detected an increased amyloid plaque load in 89 % of patients with clinically probable alzheimer disease ( ad )
结论： pib - pet检测显示淀粉样蛋白沉积增加占临床诊断“很可能” ad的89 。 |
| 6. | The high frontal amyloid load detected by [ 11c ] pib - pet in ad in the face of spared glucose metabolism is of interest and suggests that amyloid plaque formation may not be directly responsible for neuronal dysfunction in this disorder
额叶较高的淀粉样蛋白沉积却不伴有相应的脑葡萄糖代谢率下降提示其对神经元退变影响的非直接作用。 |
| 7. | The frequently used parameters such as the power in bucket ( pib ) , the beam width , the curvature radius , the far field divergence , the m2 - factor , the rayleigh length and the kurtosis are calculated in term of the intensity moments
第二章用强度矩的方法研究了hchg光束，研究了hchg光束的pib系数、陡峭度在传输过程中的变化以及偏心系数b和厄米多项式阶数m对光束质量的影响。 |
| 8. | Chapter 4 : applying the definitions of the generalized second and fourth order moments , the beam propagation m2 - factor and the kurtosis parameter of coherent and incoherent combinations of two - dimensional off - axis elegant hermite - gaussian ( ehg ) beams are derived analytically and numerically . and the power in bucket ( pib ) is also presented numerically . our results illustrate the propagation properties of the beam through a first - order optical abcd system
第四章：讨论了相干和非相干离轴完美厄密高斯( eleganthermitegaussian ( ehg ) )光束组的传输特性，通过解析推导和数值模拟，研究了相干和非相干的离轴ehg光束组的传输，得出并比较了相干和非相干的离轴ehg光束组的光束质量因子、陡峭度和筒内的功率( powerinbucket ) 。 |
| 9. | Based on the generalized huygens - fresnel diffraction integral and in consideration of the effect introduced by astigmatism , the transformation properties of gaussian beams passing an astigmatic lens are studied analytically , the beam quality of astigmatic gaussian beams is analyzed in terms of the beam propagation factor ( m2 - factor ) and power in the bucket ( pib ) , and illustrated with numerical examples
基于广义惠更斯-菲涅尔衍射积分，并考虑了像散的影响，对高斯光束通过像散透镜后的传输特性作了解析研究，以光束传输因子和桶中功率为参数分析了像散高斯光束的光束质量，并以数值计算例加以说明。 |
| 10. | In chapter 3 , the elegant hermite - cosh - gaussian beams as another special case in hermite - sinusodiol - gaussian family is introduced and its propagation properties through a first - order optical abcd system are investigated . an analytical solution of the elegant herimite - cosh - gaussian beam propagating through a first - order abcd system is derived , and correspondingly , the closed - form m2 - factor , the beam width , the curvature radius and the power in bucket are presented analytically . the numerical investigations are carried out and show that the m2 - factor of elegant hermite - cosh - gaussian beam is greater than that of elegant hermite - gaussian beams and less than that of hermite - gaussian beams approximately
本文得到的主要结果可归纳为：首次用强度矩的方法研究了hermite - cosh - gaussia ( hchg )光束，得到了hchg光束的束宽、曲率半径、 m ~ 2因子、瑞利距离等的解析表达式；用陡峭度和pib参数去衡量hchg光束的光束质量，找到了hchg光束在传输过程中影响光束质量的因素并得到了变化规律；证明了hchg光束在传输过程中的重心和对称性都会得到保持。 |
