This SD model has to be different from the one used in Homework 4 and 6.

这系统动态学(SD)模型必须不同于课后作业4和6的模型。

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Methods: Using the SD model to build the SD diagram and using VENSIM to do stimulation analysis and intervention.

方法：用流率基本入树建模法构建系统流图，用VENSIM软件进行模拟分析和干预。

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The study, based on the system of dynamics theory and SD model, simulated the balance between the water and soil of Ejina Oasis.

本文以系统动力学理论为基础，采用SD系统动力学模型，对额济纳绿洲水土资源平衡进行模拟研究。

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Samsung's Premium Blu-ray Player (model BD-F7500) features advanced upscaling capabilities, allowing users to experience ordinary SD and HD content in superior resolution.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first

Samsung's Premium Blu-ray Player (model BD-F7500) enhances the joy of watching your favorite movies by transforming ordinary SD and HD content into a superior resolution, such as that delivered by Ultra High Definition (UHD)-supported televisions.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first

Model AVR-990 features Anchor Bay Technologies ABT-2010 advanced video deinterlacing and upscaling, converting SD sources to HD.

ENGADGET: Denon outs 2009 line of Blu-ray players, AV receivers and headphones