Helium isotopes separation through double barrier systems

2020 ◽  
Author(s):  
Valentina Poteryaeva ◽  
Mikhail Bubenchikov ◽  
Alexander Lun-Fu
Keyword(s):  
Helium Isotopes ◽  
Double Barrier ◽  
Isotopes Separation

Efficient Helium and Helium Isotopes Separation by Phosphorus Carbide P 2 C 3 Membrane

2021 ◽  
pp. 2100327
Author(s):  
Min Li ◽  
Lu Wang ◽  
Huixia Lei ◽  
Yanmei Yang ◽  
Yong‐Qiang Li ◽  
...  
Keyword(s):  
Helium Isotopes ◽  
Isotopes Separation

scholarly journals On the Mechanism of Generation of Solar Cosmic Rays Enriched by Helium-3 and Heavy Elements

1981 ◽  
Vol 94 ◽  
pp. 393-394 ◽  
Author(s):  
L. G. Kocharov ◽  
G. E. Kocharov
Keyword(s):  
Cosmic Rays ◽  
Heavy Elements ◽  
Modern State ◽  
Helium Isotopes ◽  
Physical Processes ◽  
Solar Cosmic Rays ◽  
Plasma Effects ◽  
Helium 3 ◽  
Isotopes Separation ◽  
Concrete Model

The possible mechanism of helium isotopes separation in the solar atmosphere due to plasma effects have been proposed by G.E. Kocharov (1977), I. Ibragimov and G. Kocharov (1977). The cycle of papers: G. Kocharov and L. Kocharov (1978); L. Kocharov (1979 a,b,c,d, 1980); G. Kocharov, L. Kocharov and Yu. Charikov (1980) is devoted to the development of the theory and to the search of concrete model of corresponding physical processes in the solar plasma. Here we consider briefly the modern state of this problem.

Resonant tunnelling in AlInas/GaInAs double barrier diodes grown by MOCVD

1988 ◽  
Vol 24 (3) ◽  
pp. 187 ◽  
Author(s):  
P.D. Hodson ◽  
D.J. Robbins ◽  
R.H. Wallis ◽  
J.I. Davies ◽  
A.C. Marshall
Keyword(s):  
Double Barrier ◽  
Resonant Tunnelling

scholarly journals Path-integral calculation of the fourth virial coefficient of helium isotopes

2021 ◽  
Vol 154 (10) ◽  
pp. 104107
Author(s):  
Giovanni Garberoglio ◽  
Allan H. Harvey
Keyword(s):  
Path Integral ◽  
Virial Coefficient ◽  
Helium Isotopes

scholarly journals Enhancing finite difference approximations for double barrier options: mesh optimization and repeated Richardson extrapolation

2021 ◽  
Author(s):  
Luca Vincenzo Ballestra
Keyword(s):  
Finite Difference ◽  
Optimization Procedure ◽  
Richardson Extrapolation ◽  
Mesh Optimization ◽  
Option Prices ◽  
Barrier Option ◽  
Double Barrier ◽  
Finite Difference Approximations ◽  
Barrier Option Pricing ◽  
Richardson Extrapolation Technique

AbstractWe show that the performances of the finite difference method for double barrier option pricing can be strongly enhanced by applying both a repeated Richardson extrapolation technique and a mesh optimization procedure. In particular, first we construct a space mesh that is uniform and aligned with the discontinuity points of the solution being sought. This is accomplished by means of a suitable transformation of coordinates, which involves some parameters that are implicitly defined and whose existence and uniqueness is theoretically established. Then, a finite difference scheme employing repeated Richardson extrapolation in both space and time is developed. The overall approach exhibits high efficacy: barrier option prices can be computed with accuracy close to the machine precision in less than one second. The numerical simulations also reveal that the improvement over existing methods is due to the combination of the mesh optimization and the repeated Richardson extrapolation.

A Double-Barrier-Emitter Triangular-Barrier Optoelectronic Switch

2004 ◽  
Vol 40 (4) ◽  
pp. 413-419 ◽  
Author(s):  
D.-F. Guo ◽  
J.-Y. Chen ◽  
H.-M. Chuang ◽  
C.-Y. Chen ◽  
W.-C. Liu
Keyword(s):  
Double Barrier ◽  
Optoelectronic Switch

scholarly journals Helium Isotopes Quantum Sieving through Graphtriyne Membranes

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 73
Author(s):  
Marta I. Hernández ◽  
Massimiliano Bartolomei ◽  
José Campos-Martínez
Keyword(s):  
Low Temperatures ◽  
Quantum Tunneling ◽  
Transition State Theory ◽  
Selective Adsorption ◽  
State Theory ◽  
Helium Isotopes ◽  
Quantum Calculations ◽  
Approximate Methods ◽  
Helium Atoms ◽  
Quantum Behavior

We report accurate quantum calculations of the sieving of Helium atoms by two-dimensional (2D) graphtriyne layers with a new interaction potential. Thermal rate constants and permeances in an ample temperature range are computed and compared for both Helium isotopes. With a pore larger than graphdiyne, the most common member of the γ-graphyne family, it could be expected that the appearance of quantum effects were more limited. We find, however, a strong quantum behavior that can be attributed to the presence of selective adsorption resonances, with a pronounced effect in the low temperature regime. This effect leads to the appearance of some selectivity at very low temperatures and the possibility for the heavier isotope to cross the membrane more efficiently than the lighter, contrarily to what happened with graphdiyne membranes, where the sieving at low energy is predominantly ruled by quantum tunneling. The use of more approximate methods could be not advisable in these situations and prototypical transition state theory treatments might lead to large errors.

scholarly journals Aharonov-Bohm phase operations on a double-barrier nanoring charge qubit

2006 ◽  
Vol 74 (3) ◽  
Author(s):  
Yuquan Wang ◽  
Ning Yang ◽  
Jia-Lin Zhu
Keyword(s):  
Double Barrier ◽  
Charge Qubit ◽  
Aharonov Bohm

Effects of localized phonon modes on magnetotunneling spectra in double-barrier structures

1991 ◽  
Vol 44 (23) ◽  
pp. 12959-12963 ◽  
Author(s):  
P. J. Turley ◽  
S. W. Teitsworth
Keyword(s):  
Phonon Modes ◽  
Double Barrier
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