负载Fe的ZSM-5分子筛催化剂的显微结构研究

ZSM-5是一种由Si(Al)O4四面体单元构成的沸石分子筛，具有正交结构，n=2．010nm、b=1．910nm、c=1．340nm。沿着[010]和[100]方向分别有直线型和正弦型的十圆环孔道，已有研究提出ZSM-5中掺入过渡族金属会促进烷烃的脱氢反应。本工作利用高分辨电子显微学方法配合EDS分析研究了在Fe掺杂     

长沙市太阳能热水器利用现状与前景

<正>1国内外太阳能资源开发利用现状自上世纪70年代以来,随着常规能源供给的有限性和环保压力的增加,世界许多国家掀起了开发利用太阳能的热潮,纷纷制定明确的长、中、短期战略发展目标。美国、日本、德国相继实施了"阳光计划"和"万户、百     

超临界抗溶剂法制备维生素D3脂质体前体及其表征（英文）

Vitamin D3 (VD3) proliposomes (VDP), consisted of hydrogenated phosphatidycholine (HPC) and VD3, were prepared using supercritical anti-solvent technology (SAS). The effects of operation conditions (temperature, pressure and components) on the VD3 loading in VDP were studied. At the optimum conditions of pressure of 8.0 MPa, temperature of 45 ℃, and the mass ratio of 15.0% between VD3 and HPC, the VD3 loading reached 12.89%. VD3 liposomes (VDL) were obtained by hydrating VDP and the entrapment efficiency of VD3 in VDL reached 98.5%. The morphology and structure of VDP and VDL were characterized by SEM (scanning electron micro-scope), TEM (transmission electron microscope) and XRD (X-ray diffractometer). The structure of VD3 nanoparti-cles in HPC matrix was formed. The size of VDL with an average diameter of about 1μm was determined by dynamic light scattering instrument (DLS). The results indicated that VDP can be made by SAS and VDL with high entrapment efficiency can be formed easily via the hydration of VDP.     

长沙市新能源发展思路探讨

近年来,伴随着经济快速发展对能源的需求,传统的煤炭、石油等能源开采利用越来越受到资源、环境和运输等条件的制约。新能源、可再生能源作为重要的战略替代能源,对增加能源供应,改善能源结构,保障能源安全,保护生态环境具有重要的作用,是可持续发展的必然选择。