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使用FD-NST-Ⅰ型液体表面张力系数测定仪,通过更换细铜丝加大吊环、细铜丝加小吊环、细棉线加大吊环、细棉线加小吊环四种组合的吊环测量了不同温度下纯净水和95%酒精的表面张力系数。由实验结果分析得到在使用细棉线加大吊环组合时,表面张力系数的测量结果相对于其他三种组合有最小的百分误差。 相似文献
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指出了磁场的描绘实验中所描绘的磁感线存在的系统偏差,提出并通过实验证明了另一种描绘磁感线的操作方法,可使其系统偏差减小,使描绘的磁感线更接近于理想磁感线。 相似文献
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Developing accurate self-assembly is the key for constructing functional materials from a bottom-up approach.At present, it is mainly hindered by building blocks and driving modes. We design a new self-assembly method based on the magnetic coupling between spin-polarized electrons. First-principles calculations show that spinpolarized electrons from different endohedral metallofullerene(EMF) superatoms can pair each other to ensure a one-dimensional extending morphology. Furthermore, without ligand passivation, the EMF superatoms maintain their electronic structures robustly in self-assembly owing to the core-shell structure and the atomic-like electron arrangement rule. Therefore, it should noted that the magnetic coupling of monomeric electron spin polarization can be an important driving mechanism for high-precision self-assembly. These results represent a new paradigm for self-assembly and offer fresh opportunities for functional material construction at the atomic level. 相似文献
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在相对论有效原子实势近似下,用密度泛函理论的B3LYP方法,对钯和铅采用LANL2DZ基函数,氢原子采用6-311 G**全电子基函数,对PdPb、PdPbH分子的结构进行优化.计算表明:PdPb分子的基态为X1∑ ,键长RPdPb=0.24536 nm,离解后Pd原子处于基态(单重态)而Pb原子处于激发态(单重态),离解能为3.107686 eV,引入开关函数拟合得到Murrell-Sorbie势能函数;PdPbH分子最稳态为Cs构型,电子组态为X2A′,键长RPdPb=0.2547 nm,RPdh=0.15919 nm,键角∠PbPdH=64.7856°,离解能De=4.79 eV.由微观过程的可逆性原理分析了分子的可能离解极限,并用多体项展开式理论方法分别导出基态PdPb和PdPbH分子的势能函数,其等值势能面图准确的再现了PdPb和PdPbH分子的结构特征和离解能,由此讨论了Pd Pb H分子反应的势能面静态特征. 相似文献
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