B→X_sγ和B~0-~0混合对T2HDM参数的限制

在top夸克双Higgs模型(T2HDM)下,计算了荷电Higgs玻色子对B→Xsγ和B0-0混合过程的贡献,对模型的参数空间给出了限制.通过理论值和实验值的对比,我们发现:(1)B→Xsγ的实验值将质量小于200 GeV的荷电Higgs玻色子排除掉,且将T2HDM中出现的新CP破坏相角δ限制在较小的范围内;(2)当mH =400GeV,δ=[0°,60°]时,考虑强子参数的不确定性后,B0-0混合对tanβ的限制是tanβ≤30.(3)对mH 和tanβ的限制是相关联的,在tanβ比较小(大)时,实验所允许的荷电Higgs玻色子的质量下限就比较低(高).     

具边界记忆项的波方程解的指数衰减性

本文利用能量扰动法得到具边界记忆项波动方程初边值问题解的指数衰减性。     

从传统诗经学到现代诗经学

《诗经》的中国文化元典地位的确立，以儒家诗教为本，中国传统诗经学经历了两千多年的发展，其主要表现形式是以疏释文本为基础的传、序、笺、疏之学，总括地可分为训诂、考证、义理三类内容，是中国整个封建社会政治经济的反映，是其科学文化发展的产物。在中国向半封建半殖民地转化过程中。到20世纪初，传统诗经学也在求新、求变，酝酿内容、形式和方法论的重大变革。现代诗经学是历史发展的必然产物。     

从汉语借词看语言的发展

语言变化是不可避免的。对语言变化的态度和看法也是因人而异的。在语言相互交流中 ,不断吸收新成份 ,逐步发展、完善自身 ,促进语言文化的交流     

Swelling damage in clay-rich sandstones used in the church of San Mateo in Tarifa (Spain)

This study shows that the sandstone used in the construction of the Church of San Mateo in Tarifa (Cádiz, Spain) is highly sensitive to processes of decay because of a combination of factors that are intrinsic and extrinsic to the material. The mineralogy, texture and porous system of the sandstone and the proximity of the church to the sea all play a part in these processes. X-ray diffraction reveals that there are interstratified chlorite/smectite clays among the minerals that make up the rock. These mixed layer clays have been shown to undergo hydric expansion. This phenomenon may be accompanied and augmented by the presence of NaCl which acts as an electrolyte in osmotic swelling processes. Two varieties of sandstone were used in the construction of the church, namely grey sandstone and brown sandstone. The latter is more porous and undergoes greater hydric expansion, showing a higher degree of deterioration. Ultrasound analysis has demonstrated that both varieties are anisotropic because they contain bedding planes and are affected by the preferred orientation of the phyllosilicates in the rock. The anisotropic nature of these stones was confirmed by capillary suction tests. The capillary front reaches a relatively low height which means that when water is absorbed, the anisotropic textural properties combined with the presence of chlorite–smectite mixed layers in the sandstone result in mechanical (shear) stress between the first few centimetres of the wet stone and the dry area behind. The latter effect favours the development of flakes, so causing the decay of the ornamental stone and the church façade.     

人的觉醒的动人反映--论刘半农的新诗

本文通过刘半农新诗所作的对世道沦丧的哀吟,对时代狂飚的放歌,以及对人性存在的抒情,探讨了刘半农诗歌对人的觉醒的动人反映.     

腔损耗对规则泵浦单原子微激光的影响

1Introduction Theone atommicromaserhasattractedconsiderable interestsinceitwasrealizedexperimentallyin1985[1]. BecauseitdirectlyapprovestheJaynes Cummings modeloftwo level atominteractionwithasinglemode oftheelectromagneticfieldandexhibitsanumberof quantumfeaturesincludinggenerationofphotonnum bertrappingstates[2,3],highlypureFockstatesof cavityfieldsandPoissonian,sub Poissonianphoton distribution[4,5],etc.Itisatrulyquantum mechanical fieldandprovidesausefulapproachtothestudyofin teraction…     

A Study of Language Decay from the Perspective of Semantics

This research reports a study of language decay from the perspective of semantics, in an explicit sense, from perspec?tives of the relationship between the signifier and the signified which are Saussur...     

一曲法制与道德沦丧的挽歌——《金瓶梅》的主题与文化意蕴再探

自汉代董仲舒“独尊儒术”的建议被采纳后,儒家思想长期统治中国。儒家主张“礼治”,导致法制伦理化,伦理政治化。面对元、明时期法制和伦理道德的沦丧,《金瓶梅》的作者对此却无可奈何无力挽救,因而表达出了强烈的忧患意识．唱出了一曲法制与道德沦丧的挽歌。对法制与道德沦丧的忧患,正是这部小说的主题和文化意蕴所在。     

一类四阶波动方程的弱解

研究下列初边值问题:utt αΔ2u-bΔut ututr g(u)＝0 in Ω×(0,∞);u(x,0)＝u0(x),ut(x,0)＝u1(x,0),x∈Ω;u＝(u)/(υ), x∈Ω的整体解的存在性和不存在性,以及整体解的惟一性和能量估计.这里Ω是Rn(n≥1)中的有界区域.借助于乘子方程,推出了整体解的能量衰减率.借助于势井理论,得到了在有限时刻内爆破的充分条件.由Galekin 近似方法得到解的存在性.