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亚铁离子与铁离子相互转变的实验设计 被引量:1
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作者 陈少康 《化学教学》 CAS 北大核心 2002年第7期13-14,共2页
关键词 亚铁离子 铁离子 相互转变 实验设计 中学 化学实验教学
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交接区双灶等频性并行心律相互转变呈间歇性二联律1例
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作者 徐黎伟 方炳森 《实用心电学杂志》 2004年第5期373-374,共2页
关键词 交接区 等频性并行心律 双灶相互转变 间歇性二联律 心电图 诊断
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紫花地丁两型花相互转变过程中花部形态结构的变化式样研究 被引量:1
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作者 李巧峡 黄小霞 +2 位作者 陈纹 王镛 孙坤 《植物生态学报》 CAS CSCD 北大核心 2017年第11期1190-1198,共9页
紫花地丁(Viola philippica)是具典型开放花与闭锁花混合繁育系统的植物,其两型花的形态差异为花器官发育研究提供了极好的模型。该文以不同光周期下生长的或在不同光周期间调换的紫花地丁植株为研究对象,基于形态解剖学方法,研究了过... 紫花地丁(Viola philippica)是具典型开放花与闭锁花混合繁育系统的植物,其两型花的形态差异为花器官发育研究提供了极好的模型。该文以不同光周期下生长的或在不同光周期间调换的紫花地丁植株为研究对象,基于形态解剖学方法,研究了过渡闭锁花的形态结构、开放花到完全闭锁花或完全闭锁花到开放花的变化式样,以及完全闭锁花与过渡闭锁花中不发育雄蕊与花瓣的位置效应。结果显示:该物种在短日照与中日照下均有开放花与过渡闭锁花形成,短日照下大多数花芽为开放花,少数为过渡闭锁花,中日照下大多数花芽为过渡闭锁花,少数为开放花;长日照下全为完全闭锁花。在过渡闭锁花芽中,存在着一系列雄蕊与花瓣数目不同的过渡类型,既有偏向开放花的5雄3瓣的过渡类型,也有偏向完全闭锁花的2雄1瓣的过渡类型。其中,前一种类型在短日照下的过渡闭锁花芽中所占比例较大,而后一种类型在中日照下所占比例较大。另外,过渡闭锁花与完全闭锁花的雄蕊与花瓣发育程度均存在一定的位置效应,其花芽腹侧的下花瓣(对应于开放花的下花瓣)与相邻的2枚雄蕊普遍发育最好,而后花瓣(相对于前花瓣)的发育与完全闭锁花的基本一样,为器官原基状,与后花瓣相邻的2枚雄蕊也普遍最小,而且也最容易发育为无小孢子发生的膜质状结构或原基状结构。同时,将具完全闭锁花的植株置于短日照下或将具开放花的植株置于长日照下一段时间后,重新诱导的花芽经历一系列过渡闭锁花类型后发生花型的相互转变。因此,不同光周期对紫花地丁两型花发育的影响是渐进的,长日照会抑制部分花瓣与雄蕊的发育,短日照能拮抗并破除长日照对雄蕊与花瓣的抑制。 展开更多
关键词 紫花地丁 两型花 过渡闭锁花 相互转变 位置效应
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关于导体同绝缘体的相互转变 被引量:1
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作者 杨大宇 《物理》 CAS 北大核心 2001年第12期751-751,共1页
关键词 凝聚态物理学 导体 绝缘体 相互转变 金属氢化物 YH2
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Study of nanoscratching of polymers by using molecular dynamics simulations 被引量:4
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作者 YUAN DanDan ZHU PengZhe +1 位作者 FANG FengZhou QIU Chen 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第9期1760-1769,共10页
Molecular dynamic simulations are performed to study the nanoscratching behavior of polymers.The effects of scratching depth,scratching velocity and indenter/polymer interaction strength are investigated.It is found t... Molecular dynamic simulations are performed to study the nanoscratching behavior of polymers.The effects of scratching depth,scratching velocity and indenter/polymer interaction strength are investigated.It is found that polymer material in the scratching zone around the indenter can be removed in a ductile manner as the local temperature in the scratching zone exceeds glass transition temperature Tg.The recovery of polymer can be more significant when the temperature approaches or exceeds Tg.The tangential force,normal force and friction coefficient increase as the scratching depth increases.A larger scratching velocity leads to more material deformation and higher pile-up.The tangential force and normal force are larger for a larger scratching velocity whereas the friction coefficient is almost independent of the scratching velocities studied.It is also found that stronger indenter/polymer interaction strength results in a larger tangential force and friction coefficient. 展开更多
关键词 POLYMER nanoscratching molecular dynamics
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Stimulus-responsive polymers for safe batteries and smart electronics 被引量:2
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作者 Jiaping Niu Zheng Chen +1 位作者 Jingwen Zhao Guanglei Cui 《Science China Materials》 SCIE EI CAS CSCD 2022年第8期2060-2071,共12页
Stimulus-responsive energy storage devices,which can respond to external stimuli,such as heat,pH,moisture,pressure,or electric field,have recently attracted intensive attention,aiming at the ever-increasing demand for... Stimulus-responsive energy storage devices,which can respond to external stimuli,such as heat,pH,moisture,pressure,or electric field,have recently attracted intensive attention,aiming at the ever-increasing demand for safe batteries and smart electronics.The most typical stimulus-responsive materials are polymers that can change their conformation by forming and destroying secondary forces,including hydrogen bonds and electrostatic interactions in response to external stimuli,accompanied by changes in the intrinsic properties such as conductivity and hydrophobicity.Although the applications of stimulus-responsive functions in rechargeable batteries are still in the early stage because of the complexity and compatibility of battery architectures,many new concepts of regulating the polymer structures upon applications of stimuli have already been developed.In this review,we discuss the recent progress of stimulus-responsive polymers on energy storage devices featuring thermal protection and intelligent scenarios,with a focus on the detailed structural transformations of polymers under a given stimulus and the corresponding changes in battery performance.Finally,we present perspectives on the current limitations and future research directions of stimulus-responsive polymers for energy storage devices. 展开更多
关键词 stimulus-responsive polymer energy storage safety
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Dynamical Properties of a Diluted Dipolar-Interaction Heisenberg Spin Glass
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作者 张开成 刘永 迟峰 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第2期257-262,共6页
Up to now the chirality is seldom studied in the diluted spin glass although many investigations have been performed on the site-ordered Edwards-Anderson model. By simulation, we investigate the dynamicaJ properties o... Up to now the chirality is seldom studied in the diluted spin glass although many investigations have been performed on the site-ordered Edwards-Anderson model. By simulation, we investigate the dynamicaJ properties of both the spin-glass and the chiral-glass phases in a diluted dipolar system, which was manifested to have a spin-glass transition by recent numerical study. By scaling we find that both phases have the same aging behavior and closer aging parameterμ. Similarly, the domains grow in the same way and both phases have a closer barrier exponent g2. It means that both the spins and the chirality have the same dynamical properties and they may freeze at the same temperature. 展开更多
关键词 CHIRALITY correlation length NONEQUILIBRIUM magnetic domain
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