Based on Image Theory and tube-tree method, an applicable ray tracing method based on virtual source tree was presented in this paper.

本文在参照了镜像法、射线管法等射线跟踪思想的基础上，提出了一种有效的基于虚拟源树的射线跟踪模型。

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Combining the wavenumber integral model and virtual source method, a software for 3d scattering field from the buried target was developed.

基于波数积分声场模型和虚源方法，开发了可计算海底掩埋物体三维散射声场的模型软件。

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The proposed photon virtual source model is suitable for accurately simulating arbitrary shape and intensity distributions of external beam.

本文提出的光子虚拟源模型能够较为精确地模拟计算任意形状和强度的外照射放射治疗射束分布。

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But others, currently authorized through a local district but serving hundreds of students who come from other districts, use the establishment of a virtual charter school as a source of cash.

FORBES: The Next Step in Scott Walker’s Corporate Education Reform Agenda: Diploma Mills

Following a federal investigation, Second Life's parent company, Linden Lab, banned all gambling in the virtual world--a major source of its business.

FORBES: Magazine Article

The software leviathan stunned a rookery of Linux users yesterday at a conference and expo in Boston with the revelation that it will now provide technical support for the open-source software running on Virtual Server, and would make Virtual Server 2005 R2 available free.

FORBES: Magazine Article