Tremella Quality of Combined Hot-air and Vacuum Drying and Its Effect on Micro-structure A New Technique of Fast Paraffin Sectioning in Plant Tissues Process Optimization of Freezing-vacuum Drying for Fresh Pumpkin Slices Analysis on drying process, equipment application status and problem of Chinese materia medica pills Effect of Different Drying Methods on the Liquid Impregnation of Chinese Fir Plantation Wood