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陈卫平 《浙江大学学报(理学版)》1995,(Z1)
本文从钟慢效应方程和尺缩效应方程推导出时空互变方程:L_t=L_0t_0.它揭示了相对论四维时空相对性与绝对性相统一的内在原因.它指明,在机械运动中,钟慢效应必然与尺缩效应相互补偿. 相似文献
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氟两相催化反应的进展 总被引:6,自引:0,他引:6
对氟两相催化反应作一介绍。氟两相体系是一种新的相分离和固定化技术,全氟溶剂与大多数有机溶剂不互溶,而在催化剂分子中引入适当数量、大小和形状的氟尾能使之优先溶于全氟溶剂,在氟两相体系中进行催化反应就使催化剂的回收再用产物的纯化都变得极为方便。 相似文献
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Coercivity Ageing Effect on FePt Nanoparticles in Mesoporous Silica via Stepwise Synthesis Strategy 下载免费PDF全文
FePt nanoparticles in mesoporous silica are fabricated by a simple stepwise synthesis strategy.A pre-annealing temperature-dependent coercivity-ageing effect in FePt nanoparticles is observed at room temperature.For facecentered cubic(fcc)structured FePt nanoparticles,the ageing effect is sensitive to the pre-annealing temperature,especially when the temperature is close to the phase-transition.The special magnetic behavior of FePt nanoparticles reveals that the physical properties gradually change between fee and face-centered tetragonal structures,and will deepen our understanding of the mechanism of such magnetism in FePt nanoparticles. 相似文献