【目的】硅能够缓解一些植物的非生物胁迫症状,但是硅能否缓解鸭茅的铝毒症状并不清楚。为明确硅缓解铝胁迫下鸭茅植株生长发育的调节机理。【方法】试验选取中国西南地区主栽鸭茅品种,德纳塔(Donata)、安巴(Amba)、宝兴(Baoxing)和牧友...【目的】硅能够缓解一些植物的非生物胁迫症状,但是硅能否缓解鸭茅的铝毒症状并不清楚。为明确硅缓解铝胁迫下鸭茅植株生长发育的调节机理。【方法】试验选取中国西南地区主栽鸭茅品种,德纳塔(Donata)、安巴(Amba)、宝兴(Baoxing)和牧友(Potomac)为供试植物,利用水培试验研究了不同添加量的外源硅(0、2 m M)对铝(0、10、30、50和100μM)胁迫下鸭茅(Dactylis glomerata L.)植株生长、形态构建及对铝离子吸收的影响。【结果】(1)外源加硅2 m M明显缓解了铝胁迫下鸭茅植株生长的受抑症状,在一定程度上增加了鸭茅根系干重及枝条干重,并改变了根冠比和叶片重量比的变化趋势;(2)外源加硅明显降低了鸭茅根系和茎叶吸收和积累铝的水平,并显著增加了鸭茅的总根体积、根毛数量和根系伸长率。(3)外源加硅对缓解铝离子胁迫下的根系形态参数根系长度、表面积及体积均具有一定的调节作用。【结论】硅有利于促进铝胁迫下鸭茅植株健康形态的重新构建,并降低植株对铝离子的吸收,从而降低植株的中毒症状。展开更多
Aluminum alloy is used as the support of final optical assembly because of its excellent mechanical properties,which constitutes th e“skeleton”of high-power laser system.Stray light reflected by weak optical element...Aluminum alloy is used as the support of final optical assembly because of its excellent mechanical properties,which constitutes th e“skeleton”of high-power laser system.Stray light reflected by weak optical elements in high power laser system will fall on the inner wall frame of aluminum alloy,which will cause damage and produce impurity particles,polluting the entire optical system.However,the research on the damage mechanism and protection technology of aluminum alloy under the action of high-power laser system is still in the initial stage.This paper introduces the interaction mechanism between laser and materials,analyzes the laser damage mechanism of aluminum alloy from the perspective of plasma nano metal particle ablation,reviews the progress of laser-induced damage protection of aluminum alloy,and prospects the future research direction of laser absorption and damage protection technology of aluminum alloy under the action of high-energy laser.展开更多
The dry modification of aluminum hydroxide powders with phosphoric acid and the effects of modification of technological conditions on thermal stability, morphology and oil absorption of aluminum hydroxide powders wer...The dry modification of aluminum hydroxide powders with phosphoric acid and the effects of modification of technological conditions on thermal stability, morphology and oil absorption of aluminum hydroxide powders were investigated. The results show that the increase of mass ratio of phosphoric acid to aluminum hydroxide, the decrease of mass concentration of phosphoric acid and prolongation of mixing time are favorable to the improvement of thermal stability of aluminum hydroxide; when the mass ratio of phosphoric acid to aluminum hydroxide is 5:100, the mass concentration of phosphoric acid is 200 g/L and the mixing time is 10 min, the initial temperature of loss of crystal water in aluminum hydroxide rises from about 192.10 to 208.66 ℃, but the dry modification results in the appearance of agglomeration and macro-aggregate in the modified powders, and the oil absorption of modified powders becomes higher than that of original aluminum hydroxide.展开更多
文摘【目的】硅能够缓解一些植物的非生物胁迫症状,但是硅能否缓解鸭茅的铝毒症状并不清楚。为明确硅缓解铝胁迫下鸭茅植株生长发育的调节机理。【方法】试验选取中国西南地区主栽鸭茅品种,德纳塔(Donata)、安巴(Amba)、宝兴(Baoxing)和牧友(Potomac)为供试植物,利用水培试验研究了不同添加量的外源硅(0、2 m M)对铝(0、10、30、50和100μM)胁迫下鸭茅(Dactylis glomerata L.)植株生长、形态构建及对铝离子吸收的影响。【结果】(1)外源加硅2 m M明显缓解了铝胁迫下鸭茅植株生长的受抑症状,在一定程度上增加了鸭茅根系干重及枝条干重,并改变了根冠比和叶片重量比的变化趋势;(2)外源加硅明显降低了鸭茅根系和茎叶吸收和积累铝的水平,并显著增加了鸭茅的总根体积、根毛数量和根系伸长率。(3)外源加硅对缓解铝离子胁迫下的根系形态参数根系长度、表面积及体积均具有一定的调节作用。【结论】硅有利于促进铝胁迫下鸭茅植株健康形态的重新构建,并降低植株对铝离子的吸收,从而降低植株的中毒症状。
基金Project(AUGA5630112723)supported by the Assistant Professor Research Initiation Project of Harbin Institute of Technology,China。
文摘Aluminum alloy is used as the support of final optical assembly because of its excellent mechanical properties,which constitutes th e“skeleton”of high-power laser system.Stray light reflected by weak optical elements in high power laser system will fall on the inner wall frame of aluminum alloy,which will cause damage and produce impurity particles,polluting the entire optical system.However,the research on the damage mechanism and protection technology of aluminum alloy under the action of high-power laser system is still in the initial stage.This paper introduces the interaction mechanism between laser and materials,analyzes the laser damage mechanism of aluminum alloy from the perspective of plasma nano metal particle ablation,reviews the progress of laser-induced damage protection of aluminum alloy,and prospects the future research direction of laser absorption and damage protection technology of aluminum alloy under the action of high-energy laser.
基金Project(06SK2011) supported by the Science and Technology Program of Hunan Province, China
文摘The dry modification of aluminum hydroxide powders with phosphoric acid and the effects of modification of technological conditions on thermal stability, morphology and oil absorption of aluminum hydroxide powders were investigated. The results show that the increase of mass ratio of phosphoric acid to aluminum hydroxide, the decrease of mass concentration of phosphoric acid and prolongation of mixing time are favorable to the improvement of thermal stability of aluminum hydroxide; when the mass ratio of phosphoric acid to aluminum hydroxide is 5:100, the mass concentration of phosphoric acid is 200 g/L and the mixing time is 10 min, the initial temperature of loss of crystal water in aluminum hydroxide rises from about 192.10 to 208.66 ℃, but the dry modification results in the appearance of agglomeration and macro-aggregate in the modified powders, and the oil absorption of modified powders becomes higher than that of original aluminum hydroxide.
