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相关概念视频

Mechanism of Ciliary Motion01:05

Mechanism of Ciliary Motion

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
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Rocket Propulsion in Gravitational Field - II01:03

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A rocket's velocity in the presence of a gravitational field is decreased by the amount of force exerted by Earth's gravitational field, which opposes the motion of the rocket. If we consider thrust, that is, the force exerted on a rocket by the exhaust gases, then a rocket's thrust is greater in outer space than in the atmosphere or on a launch pad. In fact, gases are easier to expel in a vacuum.
A rocket's acceleration depends on three major factors, consistent with the...
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Rocket Propulsion in Gravitational Field - I01:20

Rocket Propulsion in Gravitational Field - I

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Rockets range in size from small fireworks that ordinary people use to the enormous Saturn V that once propelled massive payloads toward the Moon. The propulsion of all rockets, jet engines, deflating balloons, and even squids and octopuses are explained by the same physical principle: Newton's third law of motion. The matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
The motion of a rocket in space changes its velocity (and hence its...
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Rocket Propulsion in Empty Space - I01:13

Rocket Propulsion in Empty Space - I

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The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the...
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Inertial Frames of Reference01:03

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Gyroscope: Precession01:24

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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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相关实验视频

Updated: Jun 16, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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光学推进的元结构.

Senlin Rao1,2, Wendi Yi1, Haoqing Jiang3

  • 1The Institute of Technological Sciences, Wuhan University, Wuhan, 430072, P. R. China.

Advanced materials (Deerfield Beach, Fla.)
|August 16, 2024
PubMed
概括

一个新的石墨烯金属元结构 (GMM) 增强了用于航天器的脉冲激光微推进 (PLMP). 这种GMM-(HKUST-1) 材料提高了效率和稳定性,为传统推进剂提供了有希望的替代品.

关键词:
能量的转换和稳定性.金属有机框架的框架.纳米结构的推进剂 纳米结构的推进剂脉冲激光微型推进器的脉冲激光.

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Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities
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科学领域:

  • 材料科学 材料科学 材料科学
  • 航空航天工程 航空航天工程
  • 纳米技术 纳米技术

背景情况:

  • 脉冲激光微推进 (PLMP) 对小型航天器至关重要.
  • 传统的PLMP推进剂在效率和稳定性方面存在局限性.
  • 需要新的材料来克服这些挑战.

研究的目的:

  • 开发和评估一个新的光学推进元结构战略,以加强PLMP.
  • 研究由金属有机框架 (MOFs) 衍生的石墨烯金属元结构 (GMMs) 的性能.
  • 评估GMM-(HKUST-1) 材料的特异冲动,剥离效率和稳定性.

主要方法:

  • 使用MOF制造石墨烯金属元结构 (GMM),特别是GMM-(HKUST-1).
  • 包括纳米粒子大小,石墨烯层和粒子间隙在内的GMM属性的表征.
  • 实验和数值分析以测量PLMP绩效指标.
  • 在各种条件下评估光吸收效率和材料稳定性.

主要成果:

  • GMM-(HKUST-1) 实现了1072.94秒的特异冲动和51.22%的废弃效率.
  • 每个质量的冲动推力达到了105.15 μN μg-1 ,超过了传统推进剂.
  • 超结构显示了99%的光吸收效率,并在大气和湿度条件下保持稳定性.
  • 优化的纳米颗粒尺寸 (≈12 nm) 和密度 (0.958 g cm-3) 有助于提高性能.

结论:

  • 开发的基于GMM的光学推进策略显著提高了PLMP的性能.
  • 石墨烯纳米层和金属纳米结构协同改善激光能量吸收,转换和材料稳定性.
  • 这种方法有可能彻底改变微型航天器的推进和能源系统.