为验证数值模拟结果的正确性,建立了氯碱工业离子膜电解槽冷模实验装置,对电解槽内液体速度和气含率进行了实验测量,实验数据验证了模拟结果。利用实验和数值模拟方法对不同工况下气含率和气体体积分布进行了研究;对循环板上开口处膜侧...为验证数值模拟结果的正确性,建立了氯碱工业离子膜电解槽冷模实验装置,对电解槽内液体速度和气含率进行了实验测量,实验数据验证了模拟结果。利用实验和数值模拟方法对不同工况下气含率和气体体积分布进行了研究;对循环板上开口处膜侧瞬时压力进行了监测,分析了该处压力波动特性。结果表明,随着气液流量增大,电解槽内气含率增大,顶部气体滞留层增厚。当电流密度为10 k A×m^(-2)时,槽内气含率达到9.08%,为4.5 k A×m^(-2)时的近3倍。气体体积分数沿电解槽竖直方向逐渐增大,在膜与槽板夹角处最大。循环板上开口处膜侧压力信号波动明显,高频脉动主要由液体流动引起,低频脉动主要由气体流动引起。展开更多
High temperature is one of the major abiotic stresses that limit edible mushroom growth and development. The understanding of physiological alterations in response to heat stress and the corresponding mechanisms invol...High temperature is one of the major abiotic stresses that limit edible mushroom growth and development. The understanding of physiological alterations in response to heat stress and the corresponding mechanisms involved is vital for the breeding of heat-resistant edible mushroom strains. Although trehalose functions as a protectant against abiotic stresses in fungi, the putative role of trehalose in thermotolerance remains to be elucidated. In this study, we found heat stress inhibited the growth of two Pleurotus pulmonarius strains, heat-sensitive and less-sensitive, and the inhibition was more significant for the sensitive strain. Heat stress leads to the increase of lipid peroxidation and intracellular trehalose accumulation, with a higher level in the heat-sensitive strain, and this effect is independent of exogenous trehalose application. In addition, a lower concentration of exogenous trehalose application in sensitive strain than in less-sensitive strain was found to alleviate the inhibition of mycelium growth and further increase the intracellular trehalose concentration by heat stress. Thus, the protective effects of trehalose were more remarkable in the sensitive strain. The activities of intracellular trehalose metabolic enzymes, i.e., trehalose-6-phosphate synthase, trehalose phosphorylase and neutral trehalase, were determined, and our data indicated that the changes of these enzymes activities in the sensitive strain were more beneficial to accumulate trehalose than that in the less-sensitive strain.展开更多
探索古土壤层磁化率低值的原因,选取Kurtak剖面的20个典型黄土-古土壤样品测量等温剩磁(IRM)获得曲线.基于样品的IRM获得曲线符合累积对数高斯模型,所有样品拟合出3个矫顽力组分.组分1 (<30 m T)是成壤组分,组分2 (60~100 m T)是碎...探索古土壤层磁化率低值的原因,选取Kurtak剖面的20个典型黄土-古土壤样品测量等温剩磁(IRM)获得曲线.基于样品的IRM获得曲线符合累积对数高斯模型,所有样品拟合出3个矫顽力组分.组分1 (<30 m T)是成壤组分,组分2 (60~100 m T)是碎屑组分,组分3 (>100 m T)是赤铁矿或针铁矿;组分2是Kurtak黄土的主要磁性矿物,其含量变化受控于风速变化. CBD处理后所有样品只拟合出组分2,且CBD处理前后样品的磁化率值呈正相关性,指示碎屑组分是影响剖面磁化率的主要因素.黄土-古土壤层中都存在针铁矿,但针铁矿的含量不足以影响整个剖面磁化率的变化;而Kurtak黄土中的赤铁矿与针铁矿也可能是在源区生成,表明组分3也能指示源区信号.展开更多
文摘为验证数值模拟结果的正确性,建立了氯碱工业离子膜电解槽冷模实验装置,对电解槽内液体速度和气含率进行了实验测量,实验数据验证了模拟结果。利用实验和数值模拟方法对不同工况下气含率和气体体积分布进行了研究;对循环板上开口处膜侧瞬时压力进行了监测,分析了该处压力波动特性。结果表明,随着气液流量增大,电解槽内气含率增大,顶部气体滞留层增厚。当电流密度为10 k A×m^(-2)时,槽内气含率达到9.08%,为4.5 k A×m^(-2)时的近3倍。气体体积分数沿电解槽竖直方向逐渐增大,在膜与槽板夹角处最大。循环板上开口处膜侧压力信号波动明显,高频脉动主要由液体流动引起,低频脉动主要由气体流动引起。
基金supported by the National Basic Research Program of China (2014CB138303)the earmarked fund for China Agriculture Research System (CARS20)
文摘High temperature is one of the major abiotic stresses that limit edible mushroom growth and development. The understanding of physiological alterations in response to heat stress and the corresponding mechanisms involved is vital for the breeding of heat-resistant edible mushroom strains. Although trehalose functions as a protectant against abiotic stresses in fungi, the putative role of trehalose in thermotolerance remains to be elucidated. In this study, we found heat stress inhibited the growth of two Pleurotus pulmonarius strains, heat-sensitive and less-sensitive, and the inhibition was more significant for the sensitive strain. Heat stress leads to the increase of lipid peroxidation and intracellular trehalose accumulation, with a higher level in the heat-sensitive strain, and this effect is independent of exogenous trehalose application. In addition, a lower concentration of exogenous trehalose application in sensitive strain than in less-sensitive strain was found to alleviate the inhibition of mycelium growth and further increase the intracellular trehalose concentration by heat stress. Thus, the protective effects of trehalose were more remarkable in the sensitive strain. The activities of intracellular trehalose metabolic enzymes, i.e., trehalose-6-phosphate synthase, trehalose phosphorylase and neutral trehalase, were determined, and our data indicated that the changes of these enzymes activities in the sensitive strain were more beneficial to accumulate trehalose than that in the less-sensitive strain.
文摘探索古土壤层磁化率低值的原因,选取Kurtak剖面的20个典型黄土-古土壤样品测量等温剩磁(IRM)获得曲线.基于样品的IRM获得曲线符合累积对数高斯模型,所有样品拟合出3个矫顽力组分.组分1 (<30 m T)是成壤组分,组分2 (60~100 m T)是碎屑组分,组分3 (>100 m T)是赤铁矿或针铁矿;组分2是Kurtak黄土的主要磁性矿物,其含量变化受控于风速变化. CBD处理后所有样品只拟合出组分2,且CBD处理前后样品的磁化率值呈正相关性,指示碎屑组分是影响剖面磁化率的主要因素.黄土-古土壤层中都存在针铁矿,但针铁矿的含量不足以影响整个剖面磁化率的变化;而Kurtak黄土中的赤铁矿与针铁矿也可能是在源区生成,表明组分3也能指示源区信号.
