Scattering of Surface Waves by the Edge of a Small Undulation on a Porous Bed in an Ocean with Ice-cover

Scattering of surface waves by the edge of a small undulation on a porous bed in an ocean of finite depth, where the free surface has an ice-cover being modelled as an elastic plate of very small thickness, is investigated within the framework of linearized water wave theory. The effect of surface tension at the surface below the ice-cover is neglected. There exists only one wave number propagating at just below the ice-cover. A perturbation analysis is employed to solve the boundary value problem governed by Laplace＇s equation by a method based on Green＇s integral theorem with the introduction of appropriate Green＇s function and thereby evaluating the reflection and transmission coefficients approximately up to first order. A patch of sinusoidal ripples is considered as an example and the related coefficients are determined.

张永康应用小青龙汤治疗干咳经验

小青龙汤是《伤寒论》中治疗风寒外束、内有水饮的名方,本多用于咳嗽伴痰液清稀色白或泡沫痰者的治疗。张永康教授擅用小青龙汤治疗干咳、无痰、咽痒、舌淡胖苔水滑者,疗效满意,其认为干咳由'冰伏'所致。冰伏是指感受寒邪或过用寒凉药物导致内邪不能外散而被遏制于体内形成寒邪积聚,不能透发而出,如同被冰层覆盖一般。外感内伤均可致病。