多层微带线路板制造技术研究

对一种玻璃微纤维增强聚四氟乙烯高频介质材料,制造通讯用多层微带线路板的工艺流程,进行简单的介绍,对所选用的制造工艺技术进行了较为详细的论述.     

利用ICP-AES中钙的主次灵敏线同时测定各种盐湖卤水中的钙

等离子发射光谱（ICP-AES）已广泛应用于医学,地质,水质,环境等领域的检测。本文利用钙的主、次灵敏线同时测定盐湖卤水及盐水中各种不同含量的钙,其加标回收率在94.0%—100.8%范围内,与经典的容量法对比,数据能满足要求,样品浓度小于100mg/L时用灵敏线Ca317.9nm测定,样品浓度大于100mg/L时用次灵敏线Ca210.3nm测定。此法快速、准确,结果令人满意。     

The hyperfine and isotope structure of the Cd intercombination line – revisited

Careful analysis of the intercombination 5¹S₀–5³P₁ line of the ¹¹³Cd isotope with two hfs components and was carried out. The hyperfine splitting of this line was determined to uncertainty less than 10^-3 cm^-1 using neon-perturbed Doppler limited spectra.     

二维光子晶体功率分配与合成的仿真

利用平面波展开法,绘出了光子晶体的能带结构图,揭示了光子晶体能带结构的特点.在带隙结构中引入线缺陷,实现了对电磁波传播方向的控制.通过设计不同的线缺陷分布,实现了对电磁波传输能量的分配与合成.最终完成了对电磁波传播方向的控制和功率分配及合成的引导.采用Comsol Multiphysics软件对空气背景不同形状的介质光子晶体进行功率分配与合成的仿真,结果表明,在光子晶体中通过对线缺陷的设计,可实现功率的分配与合成.     

Uniform theory of the boundary diffraction wave

A uniform version of the potential function of the Maggi-Rubinowicz boundary diffraction wave theory is obtained by using the large argument expansion of the Fresnel integral. The derived function is obtained for the problem of diffraction of plane waves by a circular edge. The results are plotted numerically.     

Line intensities of C2H2 in the 7.7 μm spectral region

Absolute intensities of 414 lines are measured in eight bands of the 7.7 μm spectral region of the ¹²C₂H₂ molecule, with an average accuracy of 5%. Vibrational transition dipole moment squared values and empirical Herman–Wallis coefficients are obtained in order to model the rotational dependence of the transition dipole moment squared, except for some forbidden bands for which smoothed values are given. These data are used to calculate a line list for atmospheric or astrophysical applications.     

N2-, O2-, and air-broadened half-widths, their temperature dependence, and line shifts for the rotation band of H2O

Complex Robert–Bonamy (CRB) calculations of the half-width, its temperature dependence, and the line shift have been made for the rotation band transitions of H₂¹⁶O for N₂ or O₂, as the bath molecule. First the atom–atom component of the intermolecular potential was adjusted to reproduce the half-widths of the 22 and 183 GHz transition determined by Payne et al. (IEEE Trans. Geosci. Remote Sensing 46 (2007) 3601–3617). Then the line shape parameters were determined at seven temperatures (200, 225, 275, 296, 350, 500, and 700 K) for the H₂O–N₂ and H₂O–O₂ systems. The air-broadened values were determined at each temperature by the standard method. The half-widths, their temperature dependence, and the line shifts were studied as a function of the rotational quantum numbers. Estimating line shape parameters by scaling from one perturbing gas to another was investigated. The calculations were compared with measurement.     

上层大气中铁质流星尾迹的紫外光谱模拟

基于 Sparrow理论 ,计算了海拔 90— 95 km高空的不同初始地心坐标速度的典型铁质流星的有效温度 ,获得初速 72 km/ s的该类流星尾迹主要成分的粒子数密度 ,以 Cloudy程序模拟了该流星尾迹的 2 0 0—4 0 0 nm波段紫外辐射 ,给出了若干预期的强谱线的相对强度     

Calculating the surface tension between a flat solid and a liquid: a theoretical and computer simulation study of three topologically different methods

We discuss three topologically different methods for calculating the surface tension between a flat solid and a liquid from theoretical and computer simulation viewpoints. The first method, commonly used in experiments, measures the contact angle at which a static droplet of liquid rests on a solid surface. We present a new analysis algorithm for this method and explore the effects of line tension on the contact angle. The second method, commonly used computer simulations, uses the pressure tensor through the virial in a system where a thick, infinitely extended slab of liquid rests on a solid surface. The third method, which is original to this paper and is closest to the thermodynamic definition of surface tension, applies to a spherical solid in contact with liquid in which the flat solid is recovered by extrapolating the sphere radius to infinity. We find that the second and third methods agree with each other, while the first method systematically underestimates surface tension values.     

一个带有线搜索的新信赖域方法及其收敛性

本文利用一个修正的BFGS公式,提出了一个结合Armijo线搜索条件技术的BFGS信赖域方法,并在一定条件下证明了该方法的全局收敛性和超线性收敛性.初步的数值实验结果表明该方法是有效的.