【正】Dear Editor,We congratulate Zeng et al[1]for their study entitled"Amniotic membrane covering promotes healing of cornea epithelium and improves visual acuity after debridement for fungal keratitis".The...【正】Dear Editor,We congratulate Zeng et al[1]for their study entitled"Amniotic membrane covering promotes healing of cornea epithelium and improves visual acuity after debridement for fungal keratitis".The authors endeavored to present an alternative method for ophthalmologists in the treatment of a challenging case.We would like to express our reservations and ask for the attitudes of the authors about展开更多
In this paper, acoustical characteristic of a perforated panel with cover membranes is theoretically investigated. Based on the fundamental principle of acoustics, the expressions of reflecting the sound transmission ...In this paper, acoustical characteristic of a perforated panel with cover membranes is theoretically investigated. Based on the fundamental principle of acoustics, the expressions of reflecting the sound transmission of this construction are derived and the formulas of calculating the specific acoustic impedance are obtained, We also discuss the changes of specific acoustic resistance with some important parameters, such as the frequency, the thickness of air layer and the surface density of the membrane. A good agrecment between predicted results and measured data is illustrated.展开更多
文摘【正】Dear Editor,We congratulate Zeng et al[1]for their study entitled"Amniotic membrane covering promotes healing of cornea epithelium and improves visual acuity after debridement for fungal keratitis".The authors endeavored to present an alternative method for ophthalmologists in the treatment of a challenging case.We would like to express our reservations and ask for the attitudes of the authors about
文摘In this paper, acoustical characteristic of a perforated panel with cover membranes is theoretically investigated. Based on the fundamental principle of acoustics, the expressions of reflecting the sound transmission of this construction are derived and the formulas of calculating the specific acoustic impedance are obtained, We also discuss the changes of specific acoustic resistance with some important parameters, such as the frequency, the thickness of air layer and the surface density of the membrane. A good agrecment between predicted results and measured data is illustrated.
