Self-duality triggered dynamical transition

A basic result about the dynamics of spinless quantum systems is that the Maryland model exhibits dynamical localization in any dimension. Here we implement mathematical spectral theory and numerical experiments to show that this result does not hold, when the 2-dimensional Maryland model is endowed with spin 1/2 -- hereafter dubbed spin-Maryland (SM) model. Instead, in a family of SM models, tuning the (effective) Planck constant drives dynamical localization{delocalization transitions of topological nature. These transitions are triggered by the self-duality, a symmetry generated by some transformation in the parameter -- the inverse Planck constant -- space. This provides significant insights to new dynamical phenomena such as what occur in the spinful quantum kicked rotor.Comment: 18 pages, 6 figure

Laser field strength dependence of solid high-harmonic generation from doped systems

We have theoretically studied the field-strength dependent high-harmonic generation (HHG) in doped systems like nano-size or bulk materials. Our results show when the amplitude of the vector potential A_peak of the driving laser reaches the half-width of the Brillouin zone ({\pi}/a0), the harmonic yield of the undoped systems is larger than the doped systems. The band-climbing process enhances the interband transition of HHG for higher conduction bands. When A_peak is below {\pi}/a0 , the harmonic yield of the doped systems is stronger than the undoped systems. The atomic doping density also influences the field-strength dependent spectra.Comment: 10 page

Macrobenthic Community in Tolo Harbour, Hong Kong and its Relations with Heavy Metals

The present study investigated the macrobenthic community in Tolo Harbour, Hong Kong, aiming at linking heavy metal concentrations to differences in macrobenthic community. The stations investigated in Tolo Harbour have widely contrasting features, with some areas located in the Plove Cove displaying both high species richness and abundance while other areas displaying quite impoverished or even void of macrobenthos. High diversity and abundance of macrobenthos in areas with low heavy metal concentrations were recorded. Strong negative correlation between macrobenthic diversity and heavy metal concentrations was found, and this implicated the pollution-induced degradation of macrobenthos in some locations in Tolo Harbour. These results support the Pearson-Rosenberg model for succession along a pollution gradient. © 2010 Coastal and Estuarine Research Federation.published_or_final_versionSpringer Open Choice, 01 Dec 201

Summary of Professor Wang Xiaoyan's Experience in Treating Insomnia

Professor Wang Xiaoyan applied the theory of "monism of qi" in traditional Chinese medicine to study insomnia, and believed that insomnia was caused by a variety of pathogenic factors, which affected the normal rise and fall of qi in various organs of the human body, and eventually led to the rise of yang, which could not be submerged. Yang did not enter into yin, but became sleepless. By "supporting yang", the yang returned to its place, and this group of vitality moved slowly and orderly in the human body, and yin and yang combined to sleep peacefully

Professor Wang Xiaoyan's Experience in Treating Dementia

Dementia is a common Psychiatric disease, especially in the elderly group of high incidence, Professor Wang Xiaoyan thinks that the pathogenesis of this disease is the deficiency of upper qi, Yang qi can not access the brain body, the etiology is divided into two categories, including deficiency syndrome is divided into weak temper, kidney essence deficiency, positive syndrome is divided into phlegm turbidity and upper confusion, Yang Ming dry heat, etc.Clinical patients are mostly mixed with deficiency and reality, need to distinguish the primary and secondary, dialectical treatment, remarkable effect