Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Rocket Propulsion in Gravitational Field - II01:03

Rocket Propulsion in Gravitational Field - II

2.8K
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...
2.8K
Rocket Propulsion in Empty Space - I01:13

Rocket Propulsion in Empty Space - I

3.8K
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...
3.8K
Rocket Propulsion In Empty Space - II01:12

Rocket Propulsion In Empty Space - II

3.5K
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...
3.5K
Korotkoff Sounds01:12

Korotkoff Sounds

8.3K
Korotkoff sounds are the specific sounds heard while measuring blood pressure using a sphygmomanometer, typically with a stethoscope or a Doppler device. They are named after Russian physician Nikolai Korotkov, who first described them in 1905. These sounds correspond to turbulent blood flow in the artery as the blood pressure cuff is gradually released after inflation.
During blood pressure assessment, inflating the cuff 30 millimeters of mercury above the patient's systolic blood pressure...
8.3K
Heart Sounds01:15

Heart Sounds

3.7K
Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V)...
3.7K
Soundness of Cement01:17

Soundness of Cement

573
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
573

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Micrometer-Scale Graphene-Based Liquid Cells of Highly Concentrated Salt Solutions for In Situ Liquid-Cell Transmission Electron Microscopy.

ACS omega·2024
Same author

Nonmagnetic framboid and associated iron nanoparticles with a space-weathered feature from asteroid Ryugu.

Nature communications·2024
Same author

Machine Learning Refinement of In Situ Images Acquired by Low Electron Dose LC-TEM.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2024
Same author

Chiral Spinodal-like Ordering of Homoimmiscible Water at Interface between Water and Chiral Ice III.

The journal of physical chemistry letters·2024
Same author

Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium.

Science (New York, N.Y.)·2023
Same author

Dissolution enables dolomite crystal growth near ambient conditions.

Science (New York, N.Y.)·2023

Related Experiment Video

Updated: Feb 5, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

13.3K

Sounding-rocket microgravity experiments on alumina dust.

Shinnosuke Ishizuka1, Yuki Kimura2, Itsuki Sakon3

  • 1Institute of Low Temperature Science, Hokkaido University, Hokkaido, Sapporo, 060-0819, Japan.

Nature Communications
|September 21, 2018
PubMed
Summary
This summary is machine-generated.

Scientists experimentally reproduced a key infrared feature from evolved stars. This finding supports the theory that alumina nanoparticles are responsible for the 13 μm band observed around these celestial objects.

More Related Videos

Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
07:54

Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas

Published on: April 3, 2018

8.7K
In Vitro Growth of Mouse Preantral Follicles Under Simulated Microgravity
10:48

In Vitro Growth of Mouse Preantral Follicles Under Simulated Microgravity

Published on: December 17, 2017

8.8K

Related Experiment Videos

Last Updated: Feb 5, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

13.3K
Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
07:54

Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas

Published on: April 3, 2018

8.7K
In Vitro Growth of Mouse Preantral Follicles Under Simulated Microgravity
10:48

In Vitro Growth of Mouse Preantral Follicles Under Simulated Microgravity

Published on: December 17, 2017

8.8K

Area of Science:

  • Astronomy
  • Astrophysics
  • Materials Science

Background:

  • Alumina (Al2O3) is a suspected primary condensate in evolved stars.
  • The stable polymorph, alpha-alumina (α-Al2O3), is a candidate for a 13 μm infrared feature near stars.
  • This 13 μm feature has remained unidentified due to lack of experimental reproduction.

Purpose of the Study:

  • To experimentally reproduce the 13 μm infrared feature associated with evolved stars.
  • To investigate the nucleation of alumina nanoparticles under conditions simulating evolved stars.
  • To identify the specific alumina polymorph responsible for the observed spectral feature.

Main Methods:

  • Nucleation experiments of Al2O3 nanoparticles were conducted.
  • Experiments were performed in a microgravity environment using a sounding rocket.
  • Infrared spectroscopy was employed to monitor the nucleated nanoparticles.

Main Results:

  • The study successfully reproduced a sharp 13.55 μm spectral feature.
  • The experimental feature's width closely matches observations near oxygen-rich AGB stars.
  • Alpha-alumina (α-Al2O3) nucleation was confirmed under simulated stellar conditions.

Conclusions:

  • The experimental reproduction of the 13 μm feature provides strong evidence for α-Al2O3 as its source.
  • This finding validates models of dust condensation around oxygen-rich evolved stars.
  • The study offers a basis for refining condensation models in stellar environments.