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关于提高学生实验兴趣的探讨 总被引:1,自引:0,他引:1
人对事物的兴趣大多源于客观事物本身对人的一种吸引力,从而导致了人们对该事物的关心和研究,兴趣对于学生在学习上起着不可估量的推动作用,能收到事半功倍的显著效果.那么,怎样看待学生对物理实验的兴趣大小呢?笔者就此对我院2002级的200名大学生进行了问卷调查,本文就存在问题原因分析和改进途径进行了探讨. 相似文献
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计算机科学的发展,为物理实验教学和管理的改革开辟了广阔的天地.从教学管理的科学化到教学方式的多样化,都成为可能.从近年的教研和实践来看,计算机技术作为一种有效的辅助教学和管理手段,充分展现出特有的扩展信息量、节省课时、便于启发思维和活跃课堂气氛的优点,尤其是把图、文、声、像高度集于教学中,是一种有意义的、值得不断尝试的工作. 相似文献
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The population transfer in a ladder-type atomic system driven by linearly polarized sech-shape femtosecond laser pulses is investigated by numerically solving Schr6dinger equation without including the rotating wave approximation (RWA). It is shown that population transfer is mainly determined by the Rabi frequency (strength) of the driving laser field and the chirp rate, and that the ratio of the dipole moments and the pulse width also have a prominent effect on the population transfer. By choosing appropriate values of the above parameters, complete population transfer can be realized. 相似文献
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This paper investigates the control role of the relative phase between the probe and driving fields on the gain, dispersion and populations in an open A system with spontaneously generated coherence (SGC). It shows that by adjusting the value of the relative phase, a change from lasing with inversion to lasing without inversion can be realized; the values and frequency spectrum regions of the inversionless gain and dispersion can be obviously varied; high refractive index with zero absorption and electromagnetically induced transparency can be achieved. It is also found that when the driving field is resonant, the shapes of the dispersion and the gain curves versus the probe detuning are very similar if the relative phase of the dispersion lags π/2 than that of the gain, however for the off-resonant driving field the similarity will disappear; the gain, dispersion and populations are periodical functions of the relative phase, the modulation period is always 2π; the contribution of SGC to the inversionless gain and dispersion is much larger than that of the dynamically induced coherence. 相似文献
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物理实验室的开放和精细化管理,是各高校必须面对的问题。从实验室开放的作用和方法以及实验项目改革等方面进行了简要的论述和探索。 相似文献
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In an open A type system with the spontaneously generated coherence (SGC), when the probe and driving fields have different frequencies, the switching of the group velocity of the probe pulse from subluminal to superluminal is realized not only by adjusting values of the relative phase between the probe and driving fields but also by varying values of the incoherent pumping rate. For the subluminal propagation, the system always exhibits the probe absorption, however, the superluminal propagation is always companied with gain of the probe field. 相似文献
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铽(Ⅲ)(Tb3+)与诺氟沙星能生成二元配合物,在272 nm紫外光照射下配合物中的配体诺氟沙星能吸收能量并将其能量转移给稀土铽(Ⅲ)离子,产生铽(Ⅲ)离子的特征荧光峰,最大峰位于545 nm。而配合物的二级散射峰也恰好在545 nm。当一定浓度和一定大小颗粒的银纳米粒子加入到二元体系中时,不仅增强了铽(Ⅲ)与诺氟沙星配合物分子间的能量传递,同时也增大了体系的二级散射光强度,使得体系在545 nm处的总发射光强度大大增加,且体系的发光强度与诺氟沙星的浓度在一定浓度范围内成正比。 据此建立了一种新的诺氟沙星的分析方法。实验研究了银纳米粒子-铽(Ⅲ)-诺氟沙星体系测定诺氟沙星的最佳实验条件,线性范围为6.0×10-9~1.0×10-5 mol·L-1,检出限为4.4×10-9 mol·L-1。由于产生的发射光谱是长波区的锐线光谱,该方法干扰少、灵敏度高、选择性好, 用于测定胶囊和眼药水中诺氟沙星的含量,其回收率在93.2%~102.0%。 相似文献