实验仪器和教学方法优化研究

针对大学生物理知识减少和仪器设备智能化的现状,在综合分析的基础上,提出了相应的对策.     

Ba/Ag双掺杂对Ca3Co4O9基热电氧化物热传输性能的影响

采用溶胶-凝胶结合放电等离子烧结的方法制备了Ba, Ag双掺杂的Ba_xAg_yCa_2.8Co₄O₉块体热电氧化物材料, 利用X射线衍射仪, 扫描电子显微镜和热参数测试仪分析了所得样品的物相、微观组织结构和热输运性能. 结果表明, 通过Ba, Ag双掺杂有效调制了Ca₃Co₄O₉的热传输性能, 增加Ba掺杂量能有效降低其热导率. 分析结果表明, Ba, Ag双掺杂对热导率的调制来源于对晶格热导率的调制, 其中Ba, Ag等量掺杂所得样品热导率最低, 其总热导率和晶格热导率在973 K时分别达到了1.43 W/mK和1.10 W/mK. 关键词： 3Co₄O₉')" href="#">Ca₃Co₄O₉ 双掺杂 热导率     

直接带隙Ge耦合双量子阱中的光吸收系数

在有效质量近似下,详细研究了直接带隙Ge/GeSi耦合双量子阱中带间光跃迁吸收系数和阈值能量随量子阱结构参数的变化情况。结果表明：随着量子阱阱宽增大,带间光跃迁吸收强度会逐渐减弱,阈值能量减小,吸收曲线向低能方向移动,出现了红移现象。增强耦合量子阱间的耦合效应使得带间光吸收强度显著提升。此外,与非对称耦合量子阱相比,耦合效应对对称耦合量子阱中光吸收系数的影响更为显著。     

Methyl orbital signatures in 2-amino-1-propanol

Electron density distributions of 2-aminoethanol (2AE) and 2-amino-1-propanol (2AP) are calculated in both the coordinate and the momentum spaces using the B3LYP/TZVP method. Using the dual space analysis, molecular orbital signatures of the methyl substituent in 2AP are identified with respect to 2AE. Relaxations of the geometry and the valence orbital in 2AP are found to be due to the insertion of the methyl group. Five orbitals, not four orbitals, are identified as the methyl signatures. They are orbital 5a in the core shell, orbitals 9a and 10a in the inner valence shell, and orbitals 15a and 16a in the outer valence. In the inner valence shell, the attachment of methyl to 2AE causes a splitting of its orbital 8a into orbitals 9a and 10a of 2AP, whereas in the outer valence shell, the methyl group results in the insertion of an additional orbital pair of 15a and 16a. The frontier molecular orbitals 21a, 20a, and 19a are found to have no significant role in the methylation of 2AE.     

外电场对直接带隙Ge量子阱中的光学性质的影响

在有效质量近似下,考虑到外电场的影响,详细研究了直接带隙Ge/GeSi量子阱中带间光跃迁吸收系数和阈值能量随量子阱阱宽,外电场强度的变化情况。结果表明：随着外电场的增强,带间光跃迁吸收强度会逐渐减弱,阈值能量减小,吸收曲线向低能方向移动,出现了红移现象。此外,当量子阱比较大时,外电场对量子阱中带间光跃迁阈值能量的影响更加明显。     

Methyl orbital signatures in 2-amino-l-propanol

Electron density distributions of 2-aminoethanol （2AE） and 2-amino-l-propanol （2AP） are calculated in both the coordinate and the momentum spaces using the B3LYP/TZVP method. Using the dual space analysis, molecular orbital signatures of the methyl substituent in 2AP are identified with respect to 2AE. Relaxations of the geometry and the valence orbital in 2AP are found to be due to the insertion of the methyl group. Five orbitals, not four orbitals, are identified as the methyl signatures. They are orbital 5a in the core shell, orbitals 9a and 10a in the inner valence shell, and orbitals 15a and 16a in the outer valence. In the inner valence shell, the attachment of methyl to 2AE causes a splitting of its orbital 8a into orbitals 9a and 10a of 2AP, whereas in the outer valence shell, the methyl group results in the insertion of an additional orbital pair of 15a and 16a. The frontier molecular orbitals 21a, 20a, and 19a are found to have no significant role in the methylation of 2AE.     

直接带隙Ge耦合双量子阱中的光吸收系数

在有效质量近似下,详细研究了直接带隙Ge/Ge Si耦合双量子阱中带间光跃迁吸收系数和阈值能量随量子阱结构参数的变化情况.结果表明:随着量子阱阱宽增大,带间光跃迁吸收强度会逐渐减弱,阈值能量减小,吸收曲线向低能方向移动,出现了红移现象.增强耦合量子阱间的耦合效应使得带间光吸收强度显著提升.此外,与非对称耦合量子阱相比,耦合效应对对称耦合量子阱中光吸收系数的影响更为显著.     

有效数字在工科大学物理实验中的应用探讨

基于有效数字的概念分析,首先对有效数字的读数和运算规则进行了解释和简化,其次归纳出有效数字修约的一般原则,最后明确了物理实验中有效数字的教学目标。     

焦利氏称测液体表面张力系数的探讨

在精确推导焦利氏称测液体表面张力系数测量公式的基础上,分析了各物理量对实验结果的影响,探讨了金属 型框与实验精确度的关系,进而提出提高实验精确度的建议。