松香基双子表面活性剂合成及应用进展

松香是一种重要的天然化工原料,无毒、可再生,应用十分广泛。松香系列双子表面活性剂主要是以松香酸及其衍生物合成,属于生物基表面活性剂,具有天然松香绿色环保、良好的表面性能以及良好的生物降解性能等特点,其分子设计合成、性能检测及应用开发成为研究热点。根据松香基双子表面活性剂亲水基的解离性质不同,按照阴离子型、阳离子型、两性型和非离子型对松香基双子表面活性剂进行分类,概括了近年来松香基双子表面活性剂的研究进展,探讨了松香基双子表面活性剂的各种性能,简述了各类松香基双子表面活性剂的合成方法、性能特点及应用领域,展望了松香基型双子表面活性剂的发展趋势。

Analysis on stochastic dynamics of two-consumers-one-resource competing systems with Beddington-DeAngelis functional response

In this paper,stochastic dynamics with Lévy noise of two-consumers-one-resource competing systems with Beddington–DeAngelis functional response are considered.We first show the existence of the global positive solution,then discuss the effects of noises on the extinction of the species and the stochastic persistence of the species.In the meanwhile,numerical simulations are carried to support results.Finally,we show the existence of the stationary distribution for a special case.