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Feynman variational path-integral theory was used to obtain the groud-state energy of a polaron in a quantum well in the presence of a Coulomb potential for arbitray values of the electron-phonon couplng constant α.Numerical and analytical results showed that the energy shift was more sensitive to α than to the Coulomb binding parameter(β) and increased with the decrease of effective quantum well width lZ.it was intersting that due to the electronic confinement in the quasi-2D(quantum well)structures,the lower bound of the strong coupling regime was shifted to smaller values of α.Comparison of the polaron in the quantum well with that in the quantum wire or dot showed that the polaronic effect strengthened with decrease of the confinement dimension. 相似文献
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针对传统医学影像可视化软件难以实现跨平台访问,以及有限的影像数据的存储和体绘制能力,且缺少协同可视化共享的机制,本文提出一个基于云平台的医学影像可视化平台.利用云平台超大的存储容量以及强大的图形图像处理能力,在云端进行医学图像的编解码、分割及高级体绘制,然后本文提出支持协同可视化的自适应医学元数据和图像数据传输协议,通过浏览器和云端的实时交互以及浏览器和浏览器的对等传输,实现了影像的各种二维和三维协同可视化交互功能.实验结果表明,我们的平台不仅能以协同方式支持大容量数据的二维实时浏览和伪彩映射,而且支持三维的高级分割和体绘制操作,并且有较好的实时交互性. 相似文献
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