温度和包装对冬枣果实贮藏品质的影响

以初红果期的冬枣为材料,研究了不同贮藏温度(常温、5℃和0℃)和包装(30μm PE和50μm PVC膜)条件下果实失重率、转红率及内含物变化情况。结果表明,低温和包装能够显著抑制果实水分蒸发和果面转红速度,延缓可溶性糖和可滴定酸的转化,保持了较高的维生素C 含量。不同贮藏温度间以0℃效果最好,5℃次之,常温最差;30μm PE包装贮藏效果较好,50μm PVC包装贮藏期不宜超过30d。

芥末精油对冬枣抑菌保鲜效果研究

以冬枣为试材,研究测定了芥末精油熏蒸处理对冬枣采后主要病原菌的抑制效果,及对其贮藏期腐烂率和转红率的影响。结果表明:芥末精油熏蒸处理对冬枣采后3种病原菌抑制效果较好。10μL/L芥末精油熏蒸处理对3种病原菌的抑制效果高于其他组;20μL/L芥末精油熏蒸处理可明显抑制冬枣转红,而80μL/L芥末精油熏蒸处理会促进冬枣的后熟。虽然浓度越高对冬枣采后腐烂率抑制越好,但是结合对病原菌的抑制效果、转红率、腐烂率等指标综合考虑,30μL/L芥末精油熏蒸处理对冬枣采后具有一定的抑菌保鲜作用。

Photoelectric Conversion Efficiency Enhanced by Tilting Monocrystalline Silicon Photovoltaic Devices

Based on the idea of tilting a photoelectric conversion device,the monocrystalline silicon p-n junction device was tilted to make light incident upon the device at an angle of 45° with the normal of the device surface,resulting in infrared multiple-internal-reflection inside the device.The internal reflection leads to path length increase of infrared light,making the enhancement of infrared absorption of the device.An increase of 11% in energy conversion efficiency has been obtained through tilting the device.