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相关概念视频

Glassware Calibration01:11

Glassware Calibration

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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Instrument Calibration01:12

Instrument Calibration

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Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
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Bringing the Visible Universe into Focus with Robo-AO
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两个孔径测量GEO-feeder自适应光学预补偿优化预补偿.

Perrine Lognoné, Jean-Marc Conan, Ghaya Rekaya

    Optics letters
    |September 1, 2023
    PubMed
    概括

    我们开发了一种新方法,使用两个地面站来估计地球静止轨道 (GEO) 卫星的光学链接相位. 这通过减少大气扭曲来提高电信性能,特别是在恶劣的条件下.

    科学领域:

    • 光学通信是一种光学通信.
    • 大气物理大气物理学
    • 太空工程 太空工程

    背景情况:

    • 从地面到地球静止轨道 (GEO) 的光学链接对于卫星通信至关重要.
    • 由大气动荡引起的前沿异行星主义,降低了电信性能.
    • 目前的方法在恶劣的大气条件下扎.

    研究的目的:

    • 提出一种新的方法来估计地面到GEO光学链路的预补偿阶段.
    • 为了减轻对GEO-feeder链路性能的影响.
    • 改进卫星通信的合流量统计.

    主要方法:

    • 使用两个地面孔的下行链路相位和日志振幅测量.
    • 估计预补偿阶段以抵消大气影响.
    • 将性能与单孔估计方法进行比较.

    主要成果:

    • 减少了50%的异平平相变异.
    • 在恶劣的大气条件下,在单孔方法中表现出优越的性能.
    • 表明低分辨率的振幅测量足以用于第二个光圈.

    结论:

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  • 拟议的双孔方法有效地减少了地面到GEO光学链路中的异平面主义.
  • 这种技术提高了卫星电信性能和合流量.
  • 该方法非常稳固,特别是在具有挑战性的大气流下.