Recoil

Summary

Recoil (often called knockback, kickback or simply kick) is the rearward thrust generated when a gun is being discharged. In technical terms, the recoil is a result of conservation of momentum, as according to Newton's third law the force required to accelerate something will evoke an equal but opposite reactional force, which means the forward momentum gained by the projectile and exhaust gases (ejectae) will be mathematically balanced out by an equal and opposite momentum exerted back upon the gun. Basics Any launching system (weapon or not) generates recoil. However recoil only constitutes a problem in the field of artillery and firearms due to the magnitude of the forces at play. Gun chamber pressures and projectile acceleration forces are tremendous, on the order of tens to hundreds megapascal and tens of thousands of times the acceleration of gravity (g's), both necessary to launch the projectile at useful velocity during the very short time (typically only a few m

Official source

https://en.wikipedia.org/wiki/Recoil

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Feasibility of a Dielectric Elastomer Augmented Aorta

Morgan Almanza, Jonathan André Jean-Marie Chavanne, Yoan René Cyrille Civet, Francesco Clavica, David Moser, Yves Perriard

Although heart transplantation is a gold standard for severe heart failure, there is a need for alternative effective therapies. A dielectric‐elastomer aorta is used to augment the physiological role of the aorta in the human circulatory system. To this end, the authors developed a tubular dielectric elastomer actuator (DEA) able to assist the heart by easing the deformation of the aorta in the systole and by increasing its recoil force in the diastole. In vitro experiments using a pulsatile flow‐loop, replicating human physiological flow and pressure conditions, show a reduction of 5.5% (47 mJ per cycle) of the heart energy with this device. Here, the controlled stiffness of the DEA graft, which is usually difficult to exploit for actuators, is perfectly matching the assistance principle. At the same time, the physiological aortic pressure is exploited to offer a prestretch to the DEA which otherwise would require an additional bulky pre‐stretching system to reach high performances.

2021

Charged excitons in modulation-doped quantum wires

Marc-André Dupertuis, Benjamin Dwir, Elyahou Kapon, Nicolas Moret, Daniel Oberli

We report on the observation of negatively- and positively-charged excitons in the photoluminescence spectra of V-groove quantum wires. The. charged exciton binding energy increases with the strength of the quantum confinement. We demonstrate that fluctuations of the confinement potential cause the localization of the exciton and of the charged exitons on the same location. We discover that a large fraction of the enhancement of the charged exciton "binding energies" has a kinetic origin associated with the recoil energy transferred to the remaining carrier during the emission process.

American Institute of Physics2005

, ,

The feasibility of a new, 2-laser, isotope sepn. scheme was tested. The 1st laser induces isotopically selective condensation in the collisional region of a free jet of SF6 dild. in Ar. Thus, a mol. beam contg. non-clustered 32SF6 and clustered 34SF6{m}Ar{n} is produced. The 2nd laser, which acts in a 2nd chamber in the collision-free part of the mol. beam, then seps. the SF6 isotopomers in space by IR vibrational predissocn. of the clusters, which is followed by the recoil of the fragments contg. 34SF6 away from the beam centroid. The magnitude of the fragment recoil is measured, as well as the effect of SF6 diln. on the vibrational predissocn. spectrum in the 9-11 mm region.

1985