高温超导体Josephson阵列在磁场中的微波响应与磁通涡旋激发

本文从分析相变电阻率 ρP 和磁通蠕动电阻率 ρF 出发 ,指出当T小于某一温度T0 时 ,ρF>ρP,而当T >T0 时 ,ρF 远小于 ρP,并进一步分析了 ρF 与 ρP 随温度的变化率分布图 ,得出磁通蠕动电阻率 ρF 随温度的变化率分布图跟微波响应曲线具有相似的分布特征 ,结果表明 :高温超导体的非平衡微波响应机制可能与磁通涡旋的激发有关 .     

Burgers方程的MPS-MAFL数值解法

使用一种粒子无网格线混合格式MPS-MAFL方法对Burgers方程进行了数值求解,给出了算法的详细过程对计算结果进行了分析,计算结果与解析解相吻合.进行了变参数初步计算,给出了在不同粒子数目及不同粒子作用半下的计算结果.计算表明,使用MPS-MAFL方法求解Burgers方程具有较高的通用性及稳定性,且方法简单易行.     

SOFC/MGT混合系统耦合特性研究

在SOFC/MGT混合分布式能源系统中,选择不同的系统参数将对SOFC乃至SOFC/MGT混合系统的输出特性、安全运行等造成很大的影响。本文建立了一个典型的SOFC/MGT混合系统计算模型,研究了透平入口温度及燃气轮机压比对混合系统性能的影响。结果表明,透平入口温度和压比增大时,系统的输出功率和效率都会下降,而透平入口...     

基于光纤布拉格光栅的智能服装人体测温模型研究

根据热量传递机理建立了智能服装中光纤布拉格光栅人体测温的热传递物理模型,对人体、空气层和服装之间的热传递进行了有限元建模和稳态热分析,确定了智能服装中光纤布拉格光栅温度场的数学模型,利用该数学模型对光纤布拉格光栅测量温度值进行了修正.在多点加权皮肤平均温度的基础上,提出了由左右胸、左右腋和后背五处皮肤温度构成的智能服装...     

时间倾斜算子在离心压缩机动/静相干非定常模拟中的应用

本文介绍了用时间倾斜算子来处理非定常计算中非等栅距的方法。通过引入时间倾斜算子对N-S方程进行转化,而不对几何结构作任何改变,且所计算的叶片通道数小,以确保有较好的计算效率。粘性的影响被归类到源项中来进行求解,在作时间倾斜的方程转换时,就不用忽略粘性应力项的影响,使得方程的求解更为真实。同商用软件的计算结果进行了比较,结果表明应用本文所发展的程序,能很好的预测离心压缩机级的非定常流动。     

对偶超导模型n=90—110的近似解析解

研究了对偶超导模型的大n涡旋。 基于变分原理得出了Abelian Higgs模型在n=90—110的近似涡旋解析解, 并计算了涡旋张力对n的依赖性。 发现, 每根涡旋的张力大致随n线性增长。 期望该解对理解Abelian Higgs模型中的大量子数涡旋的墙行为具有一定价值。 The large n vortices in the dual superconductor model was investigated. An approximate analytical solution was obtained for n fold quantized vortices with n=90—110 by variationally solving the AbelianHiggs model, and the vortex tension was calculated as a function of n. It was found that the vortex tension rises linearly as n grows. It is hoped that our solution shines light on the understanding of the wall behavior of the large n vortices in Abelian Higgs model.     

Analysis on FM-to-AM conversion induced by spatial filter in a high-power laser system

In order to avoid stimulated Brillouin scattering and smooth the final focal spot that reaches the D-T capsule, spectral broadening is essential. However, the modulation of spectral structure might result in frequency-to-amplitude modulation (FM-to-AM) conversion. The spatial filter pinhole is used to cut off the high-frequency transmission laser, and to ensure the desired pass. Improper parameter of pinhole would lead a negative impact. Using the spatial filter pinhole, we analyze the characteristic of intensity modulation using several pinholes of improper parameters. We then compare these results with the intensity modulation obtained from an experiment. Experimental diagnosis and design of an appropriate pinhole parameter would be highly beneficial to the field of high-power lasers.     

蒙药材肋柱花中盐酸小檗碱的反相高效液相色谱法分析

用高效液相色谱法测定蒙药材肋柱花中小檗碱的含量.色谱流动相为乙腈:水(V:V=30:70,每1000mL水中加入KH2PO43.4g),流速为0.8mL/min,紫外检测波长为345nm.结果表明,盐酸小檗碱在6.25-50μg/mL范围内具有良好的线性关系,相关系数为0.9992,实验测得平均回收率为97.7%,RSD=0.94%(n=6).方法操作简便,灵敏度高,结果准确可靠.     

Centimetre-Long Single Crystalline ZnO Fibres Prepared by Vapour Transportation

Centimetre-long ZnO fibres are synthesized by vapour transportation via thermal evaporation of ZnO powders. The growth process is carried out in a graphite crucible, in which ZnO powder is loaded as the source material, and a silicon wafer is positioned on the top of the crucible as the growth substrate. During the growth process, the source temperature is kept at 800℃ and the substrate temperature is kept at 600℃. Typical growth time to obtain centimetre-long ZnO fibres is 5-10 hours. Scanning electron microscopy （SEM）, x-ray diffraction （XRD）, transmission electron microscopy （TEM）, and selected area electron diffraction （SAED） measurement results show that ZnO fibres are single crystalline with high crystalline quality and very low defects concentration.     

GeⅩⅪ-SeⅩⅩⅢ离子n=3,Δn=0跃迁谱线和振子强度的计算

用HFR方法对CaⅨ-KrⅩⅩⅤ离子3s2,3s3p,3s3d,3p2组态能级结构进行了理论计算.在已有实验研究的基础上,通过分析离子能级沿等电子序列的变化规律,运用最小二乘拟合方法预言计算了GeⅩⅪ-SeⅩⅩⅢ离子3s2,3s3p,3s3d,3p2组态14条精细结构能级值.在此基础上,进一步计算了GeⅩⅪ-SeⅩⅩⅢ离子3s2-3s3p,3s3p-3s3d和3s3p-3p2跃迁的23条谱线波长和相应的振子强度.计算结果与已有的实验值十分吻合,波长的最大不确定度为0.008 nm.