58 research outputs found
Parabolic negative magnetoresistance in p-Ge/Ge1-xSix heterostructures
Quantum corrections to the conductivity due to the weak localization (WL) and
the disorder-modified electron-electron interaction (EEI) are investigated for
the high-mobility multilayer p-Ge/Ge1-xSix heterostructures at T = (0.1 -
20.0)K in magnetic field B up to 1.5T. Negative magnetoresistance with
logarithmic dependence on T and linear in B^2 is observed for B >= 0.1T. Such a
behavior is attributed to the interplay of the classical cyclotron motion and
the EEI effect. The Hartree part of the interaction constant is estimated
(F_/sigma = 0.44) and the WL and EEI contributions to the total quantum
correction /Delta /sigma at B = 0 are separated (/Delta /sigma_{WL} ~ 0.3/Delta
/sigma; /Delta /sigma_{EEI} ~ 0.7/Delta /sigma).Comment: 3 pages, 4 figure
Conductivity enhancement of binder-based graphene inks by photonic annealing and subsequent compression rolling
This paper describes a combination of photonic annealing and compression rolling to improve the conductive properties of printed binder-based graphene inks. High-density light pulses result in temperatures up to 500°C that along with a decrease of resistivity lead to layer expansion. The structural integrity of the printed layers is restored using compression rolling resulting in smooth, dense, and highly conductive graphene films. The layers exhibit a sheet resistance of less than 1.4Ω□-1 normalized to 25μm thickness. The proposed approach can potentially be used in a roll-to-roll manner with common substrates, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and paper, paving thereby the road toward high-volume graphene-printed electronics.</p
Hole-hole interaction in a strained InGaAs two dimensional system
The interaction correction to the conductivity of 2D hole gas in strained
GaAs/InGaAs/GaAs quantum well structures was studied. It is shown
that the Zeeman splitting, spin relaxation and ballistic contribution should be
taking into account for reliable determination of the Fermi-liquid constant
. The proper consideration of these effects allows us to describe
both th temperature and magnetic field dependences of the conductivity and find
the value of .Comment: 7 pages, 6 figure
Upgraded LED illuminator for colorimetric research
В статье описана экспериментальная осветительная установка с использованием стандартных светоизлучающих диодов. Управление яркостью светодиодных компонентов осуществляется при помощи автоматизированной системы, представляющей собой комплекс драйверов с широтно-импульсной модуляцией. Исследуемая экспериментальная осветительная установка предназначена для регулирования значения индекса цветопередачи при фиксированных цветности и общей яркости, что позволяет управлять визуально-воспринимаемой насыщенностью зелёных и красных цветов отражающих объектов.The article describes an experimental lighting system using standard light-emitting diodes. Brightness of light-emitting iodes components are managed using an automated system, which is a set of drivers with pulse width modulation. The researched experimental lighting system designed to regulate the value of the color rendering index at fixed chromaticity and brightness that makes possible to control visually perceived saturation of green and red colors reflecting objects
Pathogenic marine microbes influence the effects of climate change on a commercially important tropical bivalve
- …