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Related Concept Videos

Rocket Propulsion in Gravitational Field - II01:03

Rocket Propulsion in Gravitational Field - II

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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 Empty Space - I01:13

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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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Rocket Propulsion In Empty Space - II01:12

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The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket...
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The physiology of the gastrointestinal system begins with ingestion as food enters the mouth.
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Rocket Propulsion in Gravitational Field - I01:20

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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.
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Biocompatible propulsion for biomedical micro/nano robotics.

Arnab Halder1, Yi Sun1

  • 1Department of Health Technology, Technical University of Denmark, DK-2800, Kgs Lyngby, Denmark.

Biosensors & Bioelectronics
|May 26, 2019
PubMed
Summary

Micro/nano robots offer great potential in biomedicine. This review summarizes biocompatible propulsion techniques for these robots, highlighting their applications, advantages, and disadvantages.

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Area of Science:

  • Biomedical Engineering
  • Robotics
  • Nanotechnology

Background:

  • Micro/nano robots are emerging tools for biomedical applications like targeted delivery and minimally invasive surgery.
  • Their operation extends to previously inaccessible biological locations.
  • Effective propulsion and precise control are crucial for their in vivo use.

Purpose of the Study:

  • To review recent advancements in biocompatible propulsion techniques for micro/nano robotic devices.
  • To discuss the applications, advantages, and disadvantages of various propulsion methods.
  • To explore current challenges and future perspectives in the field.

Main Methods:

  • Literature review of recent progress in micro/nano robot propulsion.
  • Categorization of propulsion techniques: self-propulsion, external stimuli-based propulsion, and bio-hybrid propulsion.
  • Analysis of the advantages and disadvantages of each technique.

Main Results:

  • Summarized various biocompatible propulsion strategies for micro/nano robots.
  • Detailed applications in targeted drug delivery, biosensing, and cell manipulation.
  • Comparative analysis of different propulsion methods' efficacy and limitations.

Conclusions:

  • Biocompatible propulsion is key to unlocking the full potential of micro/nano robots in medicine.
  • Further research is needed to overcome challenges in precise controllability and long-term biocompatibility.
  • Future directions include developing novel propulsion systems and integrating them into clinical applications.