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相关概念视频

Control Systems01:10

Control Systems

Control systems are everywhere in contemporary society, influencing diverse applications from aerospace to automated manufacturing. These systems can be found naturally within biological processes, such as blood sugar regulation and heart rate adjustment in response to stress, as well as in man-made systems like elevators and automated vehicles. A control system is essentially a network of subsystems and processes that collaboratively convert specific inputs into desired outputs.
At the heart...
Control Systems: Applications01:25

Control Systems: Applications

Electrical engineering plays a pivotal role in our daily lives, with control systems at the heart of many applications, from home appliances to sophisticated space shuttles. Control systems manage and regulate the behavior of devices and processes, ensuring they function safely, correctly, and efficiently.
In modern vehicles, control systems manage various functions to enhance performance and safety. The steering wheel and accelerator are primary inputs in a car's control system. The direction...
Electro-mechanical Systems01:19

Electro-mechanical Systems

Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
Bioreactor Controls-I01:28

Bioreactor Controls-I

Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly monitored using...
Bioreactor Controls-II01:18

Bioreactor Controls-II

In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
Bioreactor Controls-III01:22

Bioreactor Controls-III

Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...

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相关实验视频

Updated: May 11, 2026

Application of Design Aspects in Uniaxial Loading Machine Development
05:23

Application of Design Aspects in Uniaxial Loading Machine Development

Published on: September 19, 2018

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使用Bravos控制软件v1.2的环应用器组件类型的环应用器调试的实践经验.

Xiuxiu He1, Michael A Trager1, Gil'ad N Cohen1

  • 1Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, USA.

Journal of applied clinical medical physics
|May 3, 2025
PubMed
概括
此摘要是机器生成的。

为Bravos v1.2环应用器组件类型 (ACT) 开发了一种新的调试方法. 最佳的0.2厘米偏移将剂量测量差异最小化,比传统的刚性ACT提高了准确性.

关键词:
欧盟委员会 欧盟委员会妇产科医生内腔支臂疗法 (GYN intracavity brachytherapy) 是一种治疗方法.戒指应用器的应用器

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相关实验视频

Last Updated: May 11, 2026

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Published on: September 19, 2018

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Intermediate Strain Rate Material Characterization with Digital Image Correlation
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科学领域:

  • 医学物理 医学物理
  • 辐射瘤学 辐射瘤学
  • 支臂疗法技术 支臂疗法技术

背景情况:

  • 支臂疗法治疗的准确性受源位置的影响.
  • 布拉沃斯v1.2系统引入了一个环应用器组件类型 (ACT),以提高几何精度.
  • 几何和剂量测量差异可能来自源定位的不准确性.

研究的目的:

  • 为了调试CT/MRI兼容的Bravos v1.2.2.版本的环应用器.
  • 为了评估与传统的刚性ACT相比,新环ACT的性能.
  • 研究一种用于准确定位源的新型调试方法.

主要方法:

  • 在三个Bravos后装机中评估了两种调试方法.
  • 修改后的Varian调试涉及更小的步骤尺寸,交替的停留时间,包括奇偶/偶位.
  • 在30度,45度和60度的环上,用不同的偏移 (0.0-0.2厘米) 进行了片分析.

主要成果:

  • 确定了0.2厘米的最佳偏移,最大限度地降低了所有环和后载机的计划和交付的居住位置之间的偏差.
  • 刚性ACT与环形ACT相比,呈现出更大的位置差异.
  • 在关键临床指标 (D95,D90,D2cc) 和EQD2值方面,最佳偏移减少了剂量测量差异 (<1%).

结论:

  • 一种新的调试程序有效地确定了一个最佳的偏移,以准确地定位源与环ACT.
  • 这种方法显著降低了剂量测量差异,提高了治疗的准确性.
  • 开发的程序标准化了使用v1.2控制系统的Bravos后装载机的调试,其性能优于刚性ACT.