研究背景 介入导管在现代医学中应用非常广泛,但在应用过程中普遍存在的细菌感染是一个严重的问题,要采取预防大于救治的措施.即介入导管除了需要具有优异的生物和组织相容性外,还需要具备优异的抗菌性能.而构建抗菌型表面是提高介入导管抗菌性能一种有效的方法.抗菌多肽与传统抗生素、化学药物相比,因其有明显差异的特殊的作用机制,具有抗菌谱广、作用强且迅速、不易产生耐药等优点,而使多肽类药物的研发越来越受到重视.
镍对金属碳化物如WC及石墨等具有良好的润湿性,并具有良好的压制、烧结性能,以镍粉、碳化钨粉末为骨架粉末制备的PDC(聚晶金刚石复合片)钻头性能优异.随着PDC钻头结构的改进及质量的提高,PDC钻头对地层的适用范围在不断扩大,需求越来越大,随之对镍粉的需求亦日益增加,性能要求越来越高.水雾化技术是另一种制备金属粉末的主要方法,相比于气雾化,水雾化38μm以下粉末收得率更高,生产成本更低.其原理是以高
Understanding the behavior of host lattice defects is essential to the successful application of persistent luminescence materials, because the optical properties of any insulating solid compound are
A two-dimensional cellular automaton (CA) model is adopted to simulate the ferrite (α)-austenite (γ) transformation in low-carbon steels.The nucleation of austenite, the driving force of phase transfo
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Recently, a new class of TRIP steels without Si or Al but containing 5-10 wt% Mn have been considered as potential third-generation automotive steels.This Mn-TRIP steel exhibits an excellent combinati
Previous diffusion-controlled quantitative phase-field simulations of Al-4wt.%Cu alloy during the initial transient directional solidification have demonstrated that the shape of the non-planar solid-
The hydraulic turbine runner equipped in Three Gorges Power Station has the biggest size and strictest mechanical properties requirement in the world.The turbine runner consists of crown, band,and bla