The work deals with the thermal behavior of a conventional partition wall incorporating a phase change material(PCM).The wall separates two environments with different thermal properties.The first one is conditioned,w...The work deals with the thermal behavior of a conventional partition wall incorporating a phase change material(PCM).The wall separates two environments with different thermal properties.The first one is conditioned,while the adjacent space is characterized by a temperature that changes sinusoidally in time.The effect of the PCM is assessed through a comparative analysis of the cases with and without PCM.The performances are evaluated in terms of dimensionless energy stored within the wall,comfort temperature and variations of these quantities as a function of the amount of PCM and its emplacement.展开更多
探讨低剂量短波紫外线(ultraviolet-C,UV-C)处理对苹果抗病性的影响及作用机理,为UV-C处理技术应用于苹果抗病提供理论依据。以红富士苹果为试材,以波长为254 nm紫外杀菌灯为辐射源,分别给予0、2.5、5.0、7.5、10.0、12.5 k J/m2剂量照...探讨低剂量短波紫外线(ultraviolet-C,UV-C)处理对苹果抗病性的影响及作用机理,为UV-C处理技术应用于苹果抗病提供理论依据。以红富士苹果为试材,以波长为254 nm紫外杀菌灯为辐射源,分别给予0、2.5、5.0、7.5、10.0、12.5 k J/m2剂量照射,接种青霉菌,确定适宜照射剂量;以适宜照射剂量处理苹果,接种灰霉菌,探讨短波紫外线对灰霉病的抗病性;以适宜照射剂量处理苹果,分别贮藏于20℃和0℃条件下,定期取样,测定果实的总酚含量、丙二醛含量及保护酶活性。试验最佳UV-C照射剂量为7.5 k J/m2,与对照相比差异显著。常温与低温贮藏下,7.5 k J/m2 UV-C处理可有效减少丙二醛的积累,保护细胞膜,增加总酚类物质积累,增强抗病性;处理果实的苯丙氨酸解氨酶(phenylalanine ammonia lyase,PAL)、多酚氧化酶(polyphenol oxidase,PPO)活性在整个贮藏期内均高于对照,超氧化物歧化酶(superoxide dismutase,SOD)、过氧化物酶(peroxidase,POD)活性明显升高。不论是常温还是低温贮藏,7.5 k J/m2 UV-C处理均能提高苹果的抗病性,有效抑制青霉病和灰霉病的发生及扩展。研究结果为UV-C应用于采后苹果,提高抗病性,从而延长贮藏保鲜期提供理论依据和技术参考。展开更多
文摘The work deals with the thermal behavior of a conventional partition wall incorporating a phase change material(PCM).The wall separates two environments with different thermal properties.The first one is conditioned,while the adjacent space is characterized by a temperature that changes sinusoidally in time.The effect of the PCM is assessed through a comparative analysis of the cases with and without PCM.The performances are evaluated in terms of dimensionless energy stored within the wall,comfort temperature and variations of these quantities as a function of the amount of PCM and its emplacement.
文摘探讨低剂量短波紫外线(ultraviolet-C,UV-C)处理对苹果抗病性的影响及作用机理,为UV-C处理技术应用于苹果抗病提供理论依据。以红富士苹果为试材,以波长为254 nm紫外杀菌灯为辐射源,分别给予0、2.5、5.0、7.5、10.0、12.5 k J/m2剂量照射,接种青霉菌,确定适宜照射剂量;以适宜照射剂量处理苹果,接种灰霉菌,探讨短波紫外线对灰霉病的抗病性;以适宜照射剂量处理苹果,分别贮藏于20℃和0℃条件下,定期取样,测定果实的总酚含量、丙二醛含量及保护酶活性。试验最佳UV-C照射剂量为7.5 k J/m2,与对照相比差异显著。常温与低温贮藏下,7.5 k J/m2 UV-C处理可有效减少丙二醛的积累,保护细胞膜,增加总酚类物质积累,增强抗病性;处理果实的苯丙氨酸解氨酶(phenylalanine ammonia lyase,PAL)、多酚氧化酶(polyphenol oxidase,PPO)活性在整个贮藏期内均高于对照,超氧化物歧化酶(superoxide dismutase,SOD)、过氧化物酶(peroxidase,POD)活性明显升高。不论是常温还是低温贮藏,7.5 k J/m2 UV-C处理均能提高苹果的抗病性,有效抑制青霉病和灰霉病的发生及扩展。研究结果为UV-C应用于采后苹果,提高抗病性,从而延长贮藏保鲜期提供理论依据和技术参考。
