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相关概念视频

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...

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相关实验视频

Updated: Jul 20, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
12:08

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一个MEMS格子调制器,具有可调节的正弦格子,用于大规模可伸缩开口.

Datai Hui1, Dongpeng Li1, Binbin Wang1

  • 1Key Laboratory of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, 710072, Xi'an, China.

Microsystems & nanoengineering
|March 2, 2025
PubMed
概括

这项研究引入了一种新的微电子机械系统 (MEMS) 格子调制器,具有大光圈和高光学效率. 这种新的设计克服了以前的MEMS调制器的局限性,实现了更快,更高效的光通信.

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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相关实验视频

Last Updated: Jul 20, 2026

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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科学领域:

  • 光电学是指光电子产品.
  • 在 MEMS 设备中,MEMS 设备是非常重要的.
  • 纳米光子学 纳米光子学

背景情况:

  • 微电子机械系统 (MEMS) 格调节器提供光束方向,但在光学效率和光圈尺寸方面存在局限性.
  • 现有的设计使用可移动的带,导致与微镜设备相比的制造复杂性和成本问题.

研究的目的:

  • 开发一个具有增强光圈可扩展性和高光学效率的MEMS格子调制器.
  • 为了解决先进光学应用的传统MEMS调制器的局限性.

主要方法:

  • 该研究采用可调节的正弦格设计,具有宽侧受约束的连续带,远离末端受约束的带.
  • 这种方法有助于提高可扩展性和增加格子表面的填充因子.

主要成果:

  • 一个具有30x30mm光圈和高达90%光学效率的MEMS格子调制器被实验证明.
  • 该设备实现了1.1μs的机械沉降时间,>20dB的灭比率和>95%的动态调制对比度在250kHz.
  • 实现了宽波长调制 (635-1700nm) 和广泛的视野 (±30°).

结论:

  • 开发的MEMS格子调制器在光圈尺寸和光学效率上提供了显著的改进.
  • 它显示了高速光衰减和调制反射反射器自由空间光学 (MRR-FSO) 通信的巨大潜力.
  • 这项技术为未来的高速,节能,经济高效的通信网络铺平了道路.