Results 1 - 10 of 47188
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[en] Partial electron localization in a finite-size superlattice placed in an electric field is considered. The role of electric field in forming of quasilocalized states is investigated. A quantitative criterion for the degree of partial localization is suggested based on analysis of maximal probability density of finding an electron at a given point. It is found that with increase in the electric field the degree of localization does not increase monotonically. Furthermore, the localization is affected stronger by the amplitude of superlattice potential than by the electric field.
[en] The disturbances in a semi-infinite piezoelectric medium excited by a constant polarized tangential electric field for a finite interval of time and heated by sources of heat, distributed continuously over a plane parallel to the free surface of the medium, which vary according to a ramp-type function of time, are investigated. The problem is solved using methods of transform calculus and, finally, the results are plotted graphically. (author)
[en] In this paper, recent progressive studies on experimental analysis and theoretical models for turbulence phenomena around the transport barriers in high-performance magnetic confined fusion plasma are reviewed. The linkage of radial electric fields and turbulence, the importance of radial electric field curvature, and observations of spatiotemporal turbulence structures are described with related theoretical models. (paper)
[en] We propose the use of graphene chirped-superstructure bragg gratings for far infrared frequency. Grating structure is created by placing graphene layers between the silicon waveguide. We show that tuning of frequency band is possible by changing the graphene chemical potential, graphene layer’s period and gap between them. The reflectance is increased by increasing the graphene chemical potential. The electric field response show that energy is better filtered when number of graphene layers are increased. The proposed tunable chirped-superstructure gratings can be used as reflector, filter in far infrared frequency region. (paper)
[en] A number of recent papers describing a model of breakdown and high gradient limits should be directly applicable to all rf and DC applications. Although based on low frequency rf measurements, the model can explain and reproduce the effects of a wide range of variables, (B fields, gas pressure, materials, breakdown rate dependence on electric fields, frequency and pulse length, etc.), and also some superconducting rf behavior. Highlights of this program include: the highest accelerating gradients ever recorded, new models of breakdown and high gradient operation that seem to explain all high gradient behavior, and new technology for surface measurement and control.
[en] Semiconductors compounds TlGaTe2 belong to the group of compounds of type A3B3C62, has a body-centered tetragonal lattice with symmetry group D4h18. For measurements, the crystals were taken in parallelepiped form. After a smoothly polishing crystal surface, silver paste was applied to the surface parallel to axis c and ohmic contacts were attached.
[en] The 48.7 m sup(111m)Cd activity was implanted in Zn and Be single crystals which were soldered to the cold finger of a dilution refrigerator and kept below 0.2 K during implantation. Subsequent nuclear orientation experiments allowed the determmination of the quadrupole interaction frequency νsub(Q) of the 11/2- isomeric state of 111Cd in Zn and Be as -139(15)MHz and +43(16)MHz respectively. With these results we derive the quadrupole moment of the 5/2+ 245 keV level of 111Cd including sign as Q = +0.83(13) b and the sign of the electric field gradient for Cd in Be. The half-life of sup(111m)Cd was redetermined as 48.67(6) m. (orig.) 891 FKS/orig. 892 BRE
[en] Barium plasma injection experiments have revealed a number of features of electric fields in and near auroral forms extending from a few hundred to many thousands of km in altitude. There is evidence for V-type potential structures over some auroras, but not in others. For some auroral arcs, large E fields are found at ionospheric altitudes outside the arc but the E field inside the arc is near zero. In a few other auroras, most recently one investigated in an experiment conducted from Poker Flat on March 22, 1980, large, rapidly fluctuating E fields were detected by barium plasma near 600 km altitude. These E fields suggest that the motion of auroral rays can be an effect of low-altitude electric fields, or that V-type potential structures may be found at low altitudes
[en] The current-voltage characteristics and negative differential resistance of zigzag phosphorene nanoribbons are investigated in this paper. The origin of the negative differential resistance behaviour is explained by the inspection of the transmission eigenstates. Moreover, it is shown that the current-voltage characteristics and the negative differential resistance value can be changed by applying a perpendicular electric field thanks to the buckled structure of phosphorene nanoribbons. It is concluded that this peculiar electronically tunable differential resistance characteristics of phosphorene nanoribbons can be utilized in electronically controlled oscillator circuits in the near future nanoelectronics technology. (paper)