Joule-Thomson expansion of the regular(Bardeen)-AdS black hole

We study the Joule-Thomson expansion of the regular black hole in an anti-de Sitter background,and obtain the inversion temperature for the Bardeen-AdS black hole in the extended phase space.We investigate the isenthalpic and inversion curves for the Bardeen-AdS black hole in the T-P plane and find that the intersection points between them are exactly the inversion points discriminating the heating from the cooling process.The inversion curve for the regular(Bardeen)-AdS black hole is not closed and there is only a lower inversion curve,in contrast to the Van der Waals fluid.Most importantly,we find that the ratio between the minimum inversion temperature and the critical temperature for the regular(Bardeen)-AdS black hole is 0.536622,which is larger than any known ratio for the singular black hole.The large ratio for the Bardeen-AdS black hole may be due to the repulsive de Sitter core near the origin of the regular black hole.     

Rear-surface light intensification caused by Hertzian-conical crack in 355-nm silica optics

Theoretical studies show that the Hertzian-conical crack can be considered to be composed of double cone faces for simplification. In the present study, the three-dimensional finite-difference time-domain method is employed to quantify the electric-field distribution within the subsurface in the presence of such a defect under the normal incidence irradiation. Both impurities (inside the crack) and the chemical etching have been investigated. The results show that the maximum electric field amplitude |E| _max is 9.57374 V/m when the relative dielectric constant of transparent impurity equals 8.5. And the near-field modulation will be improved if the crack filled with remainder polishing powders or water vapor/drops. Meanwhile, the laser-induced initial damage is moving to the glass-air surface. In the etched section, the magnitude of intensification is strongly dependent on the inclination angle θ. There will be a highest modulation when θ is around π /6, and the maximum value of |E| _max is 18.57314 V/m. When θ ranges from π /8 to π /4, the light intensity enhancement factor can easily be larger than 100, and the modulation follows a decreasing trend. On the other hand, the modulation curves become smooth when θ > π /4 or θ < π /8.     

关于桑叶粉的综合利用和开发

本文介绍了桑叶粉综合利用和开发的最新进展，内容包括桑叶粉概述、桑叶在食品、医药和动物饲养中的开发应用四个方面，旨在为汉中蚕桑产业的发展提供一定的参考价值。     

求解多项式方程所有实根的算法及程序实现

多项式方程求根问题在工程实践中有着举足轻重的地位,牛顿迭代法由于其良好的收敛速度而被广泛应用。文章介绍了根据牛顿迭代法的全局收敛定理,结合函数的一阶导数、二阶导数信息求得多项式方程在某一区间内的所有实根,以及每一个实根的重数。最后利用C/C＋＋语言实现了算法。例证表明,该方法能有效的求得多项式方程在某一给定区间内的所有实根及实根重数。     

复合材料中央翼结构构型优化设计

本文分别计算梁式、单块式、多腹板式结构的承载能力和质量,提出通过绘制载荷密度和质量密度的关系图指导中央翼选型的方法,并在中央翼结构设计中应用。     

Ab initio Study of He Stability in hcp-Ti

Tile stability of He in hep-Ti is studied using the a5 initio method based on the density functional theory. The results indicate that a single He atom prefers to occupy the tetrahedral site rather than the octahedral site. The interaction of He defects with Ti atoms is employed to explain the relative stabilities of He point defects in hcp-Ti. The relative stability of He defects in hcp-Ti is useful for He clustering and bubble nucleation in metal tritides, which provides the basis for development of improved atomistic models.     

Ne-Xe体系势能曲线和光谱研究

本论文对Ne-Xe体系的势能曲线和束缚态能级作了系统的研究.采用耦合簇CCSD(T)方法和超分子近似,以及aug-cc-PVXZ(X=T,Q,5)基组,计算了Ne-Xe体系的相互作用势,并采用三种方案外推得到基底限值,给出了不同基底和外推方法下的势能曲线平衡位置和势阱深度.计算了Ne-Xe体系振转能级和各同位素基振动态的纯转动跃迁频率,及相应的光谱常数,并与实验结果进行了比较.     

大蒜素天然广谱抗生素

说到大蒜,人们会津津乐道。在没有抗生素的年代,它可是行军必备物之一,专门用来杀菌和预防疾病。宫廷里有人用大蒜来消除脚气,民间有人用大蒜来治疗牙龈炎和腹泻,《本草纲目》中就记载了大蒜的医用价值。可说到大蒜素,恐怕了解的人就不多了。大蒜素是一种什么成分？对人体有什么作用？吃大蒜有什么讲究吗？     

板带轧机轴承座调心机构的研究及改进

在分析板带冷轧机下支撑辊轴承频繁破损原因的基础上,设计出一种新的调心机构.改造成功后的下支撑辊轴承座调心机构在轧辊轴线倾斜或挠曲时,最大等效应力大大减小,机构的承载能力大为提高,从而增加机构刚性,提高了机器的承载能力,可以实现轴承轴向的均载,起到很好的调心效果.     

葛根黄酮提取物诱导HL-60细胞凋亡调控研究

用RT-PCR技术和蛋白质免疫印迹技术,检测caspase-8和caspase-3基因转录和蛋白质翻译水平的变化,以探讨葛根黄酮提取物诱导HL-60细胞凋亡的调控途径。结果表明,50μg/mL葛根总黄酮提取物可以上调caspase-8和caspase-3基因转录和蛋白质翻译水平,且其能力分别强于葛根素和大豆甙元单体;说明葛根黄酮提取物诱导HL-60细胞凋亡可能通过经F as死亡受体和/或线粒体途径共同介导执行,葛根黄酮提取物抑制诱导凋亡能力强于葛根素和大豆甙元单体。