该文旨在研究不同包装方式对杏与玫瑰花酱复合果丹皮在贮藏过程中品质变化的影响,并通过品质变化规律预测其货架期。首先采用糖纸包装(candy paper packaging,CW)、真空包装(vacuum packaging,VP)、保鲜袋包装(storage bag packaging,W...该文旨在研究不同包装方式对杏与玫瑰花酱复合果丹皮在贮藏过程中品质变化的影响,并通过品质变化规律预测其货架期。首先采用糖纸包装(candy paper packaging,CW)、真空包装(vacuum packaging,VP)、保鲜袋包装(storage bag packaging,WPB)和铝箔袋包装(aluminum foil bag packaging,ABP)4种包装方式对复合果丹皮进行包装,并在常温下贮藏180 d测定其在贮藏期间品质指标的变化值,以水分含量、可溶性糖含量、硬度和菌落总数为表征指标建立化学动力学模型以预测复合果丹皮的货架期。结果表明,采用VP方式能有效延缓复合果丹皮中可溶性糖、维生素C、活性成分等营养成分的降解、抑制复合果丹皮在贮藏期间被微生物的污染。可溶性糖和菌落总数的变化规律符合零级动力学模型、水分含量与硬度的变化规律符合一级动力学模型,验证结果表明,VP方式下复合果丹皮以4种表征指标建立的预测模型准确度较高,预测值与实测值相对误差较小,Arrhenius方程具有较好的拟合性。因此,VP方式的应用将会为复合果丹皮的包装和贮藏提供理论基础。展开更多
A two-dimensional spectral-difference mode (with vorticity and density equations) of internal tides isdeveloped for studying the genration and propagration of internal tides generated at the continentalshelf/slope. In...A two-dimensional spectral-difference mode (with vorticity and density equations) of internal tides isdeveloped for studying the genration and propagration of internal tides generated at the continentalshelf/slope. In general, internal tides propagate seaward in deep sea regions and shoreward on the shelf,and are dissipated rapidly. When the Vaisala frequency decreases vertically, waves may be mostly limited to thecontinental slope region. in deep sea region, motions may have either boam-like structure or modal structure,depending on the stratification strerigth and structure, whereas a modal structure may always exist onthe shelf. Waves show strong bottom intensification on the slope when strong stratification exists on thebottom. The barotropic tidal advection may affed the temporal character of internal tides at thecontinental slope, shelf break and shelf regions. but may have little influence on the energy density and energy flux of internal tides. ln the case of strong stratification, waverforms展开更多
文摘该文旨在研究不同包装方式对杏与玫瑰花酱复合果丹皮在贮藏过程中品质变化的影响,并通过品质变化规律预测其货架期。首先采用糖纸包装(candy paper packaging,CW)、真空包装(vacuum packaging,VP)、保鲜袋包装(storage bag packaging,WPB)和铝箔袋包装(aluminum foil bag packaging,ABP)4种包装方式对复合果丹皮进行包装,并在常温下贮藏180 d测定其在贮藏期间品质指标的变化值,以水分含量、可溶性糖含量、硬度和菌落总数为表征指标建立化学动力学模型以预测复合果丹皮的货架期。结果表明,采用VP方式能有效延缓复合果丹皮中可溶性糖、维生素C、活性成分等营养成分的降解、抑制复合果丹皮在贮藏期间被微生物的污染。可溶性糖和菌落总数的变化规律符合零级动力学模型、水分含量与硬度的变化规律符合一级动力学模型,验证结果表明,VP方式下复合果丹皮以4种表征指标建立的预测模型准确度较高,预测值与实测值相对误差较小,Arrhenius方程具有较好的拟合性。因此,VP方式的应用将会为复合果丹皮的包装和贮藏提供理论基础。
基金National Education Committee Foundation Program(9142305)National Science Foundation Program(49376257)
文摘A two-dimensional spectral-difference mode (with vorticity and density equations) of internal tides isdeveloped for studying the genration and propagration of internal tides generated at the continentalshelf/slope. In general, internal tides propagate seaward in deep sea regions and shoreward on the shelf,and are dissipated rapidly. When the Vaisala frequency decreases vertically, waves may be mostly limited to thecontinental slope region. in deep sea region, motions may have either boam-like structure or modal structure,depending on the stratification strerigth and structure, whereas a modal structure may always exist onthe shelf. Waves show strong bottom intensification on the slope when strong stratification exists on thebottom. The barotropic tidal advection may affed the temporal character of internal tides at thecontinental slope, shelf break and shelf regions. but may have little influence on the energy density and energy flux of internal tides. ln the case of strong stratification, waverforms
