The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of buildin...The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of building air conditioning load were considered.The results,compared with the constant flow operation,indicate that the influence on the variations of porosity,hydraulic conductivity and confined water head is decreased by 48%,51% and 71%,respectively,under variable flow operation.The security of variable flow operation is superior to that of constant flow.It is also concluded that the climate region and function of the buildings are primary factors which affect the suitability of variable flow operation in GWSHP.展开更多
The genetic stability of variations of main agronomic characteristics in progenies from the regenerated plants of immature embryo culture in vitro was studied. The results showed that the variations of earliness in ma...The genetic stability of variations of main agronomic characteristics in progenies from the regenerated plants of immature embryo culture in vitro was studied. The results showed that the variations of earliness in maturity, high 1000-grain weight, plant height and grain weight per spike were heritable and tended to be stable in IE3 and completely stable in IE4 The wide variation of main agronomic characteristics induced by embryo culture in vitro provided the probability of selection in wheat improvement. Some somaclonal lines with useful variations could be used directly in wheat production.展开更多
本文基于2014~2016年华南前汛期(4~6月)广东省(简称粤)阳江市海陵岛风廓线雷达观测资料、地面自动观测站降水资料和ERA5再分析数据集,分析了粤西海岸低空急流的结构特征、日变化特征及其形成机制,并探讨了不同强度边界层低空急流对广东...本文基于2014~2016年华南前汛期(4~6月)广东省(简称粤)阳江市海陵岛风廓线雷达观测资料、地面自动观测站降水资料和ERA5再分析数据集,分析了粤西海岸低空急流的结构特征、日变化特征及其形成机制,并探讨了不同强度边界层低空急流对广东三个关键区域的地形降水时空分布影响。研究表明:(1)基于本文提出的低空急流四个等级判定标准,低空急流累计发生概率为21.2%,其中以1~3级低空急流为主,4级低空急流较为罕见。大部分(77.1%)低空急流的风速不超过14 m s^(-1),84.7%的低空急流风向为西南风,低空急流中心最大风速下方的风速垂直切变大多介于(5~25)×10^(-3)s^(-1)。低空急流最大风速出现的高度呈现出双峰结构,大部分低空急流出现在1 km以内的边界层。(2)天气尺度系统相关的低空急流日内发生频数表现为夜间单峰结构,而边界层急流发生频数为昼夜双峰结构。边界层急流夜间主峰值出现在上半夜至早晨,与局地海陆风触发的惯性振荡机制有关,白天次峰值主要出现在下午。近地面附近的低纬亚洲大陆低压与西北太平洋洋面高压两个高低值系统间的压力差对不同强度边界层急流形成起着关键的作用,白天大陆低压发展是强边界层急流午后峰值形成的主要原因。(3)边界层急流对广东地形降水分布和强度的影响机制复杂。粤中北部内陆和粤东沿海区域均以大尺度山脉迎风坡地形降水为主,边界层急流越强,地形降水越强;粤东沿海强地形降水落区稳定,而粤中北部内陆地形降水中心随边界层急流增强而西北移。粤西海岸带中小尺度地形的迎(背)风坡及尾流辐合区均可产生明显地形降水,强地形降水需在合适的低空入流风速背景下发生。(4)在地形降水日变化方面,粤中北部内陆区域降水在不同强度边界层急流影响下均出现了下午和早晨双峰结构,下午峰强度约为早晨峰的两倍,双峰强度随急流加强而增大;粤东沿海区域降水随着急流强度增强,降水由日内双峰结构演变为三峰结构;粤西海岸区域降水在较弱急流影响下为双峰,在4级强急流影响下为三峰结构,而在3级中等偏强急流影响下表现为中午单峰结构。展开更多
基金Project(2006BAJ01B05) supported by the National Science and Technology Pillar Program during the 11th Five-Year Plane Period
文摘The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of building air conditioning load were considered.The results,compared with the constant flow operation,indicate that the influence on the variations of porosity,hydraulic conductivity and confined water head is decreased by 48%,51% and 71%,respectively,under variable flow operation.The security of variable flow operation is superior to that of constant flow.It is also concluded that the climate region and function of the buildings are primary factors which affect the suitability of variable flow operation in GWSHP.
文摘The genetic stability of variations of main agronomic characteristics in progenies from the regenerated plants of immature embryo culture in vitro was studied. The results showed that the variations of earliness in maturity, high 1000-grain weight, plant height and grain weight per spike were heritable and tended to be stable in IE3 and completely stable in IE4 The wide variation of main agronomic characteristics induced by embryo culture in vitro provided the probability of selection in wheat improvement. Some somaclonal lines with useful variations could be used directly in wheat production.
文摘本文基于2014~2016年华南前汛期(4~6月)广东省(简称粤)阳江市海陵岛风廓线雷达观测资料、地面自动观测站降水资料和ERA5再分析数据集,分析了粤西海岸低空急流的结构特征、日变化特征及其形成机制,并探讨了不同强度边界层低空急流对广东三个关键区域的地形降水时空分布影响。研究表明:(1)基于本文提出的低空急流四个等级判定标准,低空急流累计发生概率为21.2%,其中以1~3级低空急流为主,4级低空急流较为罕见。大部分(77.1%)低空急流的风速不超过14 m s^(-1),84.7%的低空急流风向为西南风,低空急流中心最大风速下方的风速垂直切变大多介于(5~25)×10^(-3)s^(-1)。低空急流最大风速出现的高度呈现出双峰结构,大部分低空急流出现在1 km以内的边界层。(2)天气尺度系统相关的低空急流日内发生频数表现为夜间单峰结构,而边界层急流发生频数为昼夜双峰结构。边界层急流夜间主峰值出现在上半夜至早晨,与局地海陆风触发的惯性振荡机制有关,白天次峰值主要出现在下午。近地面附近的低纬亚洲大陆低压与西北太平洋洋面高压两个高低值系统间的压力差对不同强度边界层急流形成起着关键的作用,白天大陆低压发展是强边界层急流午后峰值形成的主要原因。(3)边界层急流对广东地形降水分布和强度的影响机制复杂。粤中北部内陆和粤东沿海区域均以大尺度山脉迎风坡地形降水为主,边界层急流越强,地形降水越强;粤东沿海强地形降水落区稳定,而粤中北部内陆地形降水中心随边界层急流增强而西北移。粤西海岸带中小尺度地形的迎(背)风坡及尾流辐合区均可产生明显地形降水,强地形降水需在合适的低空入流风速背景下发生。(4)在地形降水日变化方面,粤中北部内陆区域降水在不同强度边界层急流影响下均出现了下午和早晨双峰结构,下午峰强度约为早晨峰的两倍,双峰强度随急流加强而增大;粤东沿海区域降水随着急流强度增强,降水由日内双峰结构演变为三峰结构;粤西海岸区域降水在较弱急流影响下为双峰,在4级强急流影响下为三峰结构,而在3级中等偏强急流影响下表现为中午单峰结构。
