Results 21 to 30 of about 1,151,086 (296)

Transport Gap in Suspended Bilayer Graphene at Zero Magnetic Field [PDF]

open access: yes, 2012
We report a change of three orders of magnitudes in the resistance of a suspended bilayer graphene flake which varies from a few k$\Omega$s in the high carrier density regime to several M$\Omega$s around the charge neutrality point (CNP).
Maan, J. C.   +5 more
core   +5 more sources

An Optimized Carrier Phase-Shifted Modulation Strategy for Cuk PV Inverter

open access: yesIEEE Access, 2023
There exists the problems of output voltage zero-point drift and high even harmonic content of the three-phase Cuk liftable voltage photovoltaic (PV) inverter when it adopts the conventional carrier modulation method.
Renxi Gong, Cheng Zhao
doaj   +1 more source

Optical Spectroscopy of X-Mega targets in the Carina Nebula - VI. FO 15: a new O-Type double-lined eclipsing binary [PDF]

open access: yes, 2006
We report the discovery of a new O-type double-lined spectroscopic binary with a short orbital period of 1.4 days. We find the primary component of this binary, FO 15, to have an approximate spectral type O5.5Vz, i.e. a Zero-Age-Main-Sequence star.
Barba, R.   +5 more
core   +2 more sources

Application of symmetrical component method in protection system of bolter-miner

open access: yesGong-kuang zidonghua, 2017
In view of problems of low reliability and accuracy of fault diagnosis of asynchronous motor in bolter-miner, symmetrical component method was purposed to apply in protection system of bolter-miner to realize asymmetry over-current fault diagnosis. Three-
JIAO Xiaofeng
doaj   +1 more source

Periodic conservative solutions for the two-component Camassa-Holm system [PDF]

open access: yes, 2013
We construct a global continuous semigroup of weak periodic conservative solutions to the two-component Camassa-Holm system, $u_t-u_{txx}+\kappa u_x+3uu_x-2u_xu_{xx}-uu_{xxx}+\eta\rho\rho_x=0$ and $\rho_t+(u\rho)_x=0$, for initial data $(u,\rho)|_{t=0 ...
Grunert, Katrin   +2 more
core   +1 more source

A new leakage protection method for mine power network

open access: yesGong-kuang zidonghua, 2016
A new leakage protection method was proposed which was based on least-square matrix algorithm. In the method, zero sequence current signal of each brance is extracted on the basis of additional DC source system, and DC component of the zero sequence ...
ZHAO Jianwen   +6 more
doaj   +1 more source

ASSESSMENT OF CONSUMER IMPACT ON VOLTAGE ASYMMETRY BY THE ZERO SEQUENCE AT THE POINT OF COMMON CONNECTION

open access: yesВестник Северо-Кавказского федерального университета, 2022
The article presents a technique for assessment the level of consumers’ impact on the voltage asymmetry by the zero sequence at the point of common connection. The results of a computational experiment that determine the possibility of using the level of
Dmitrii Kostyukov
doaj  

Genetic integrity of the Dark European honey bee (Apis mellifera mellifera) from protected populations: a genome-wide assessment using SNPs and mtDNA sequence data [PDF]

open access: yes, 2014
The recognition that the Dark European honey bee, Apis mellifera mellifera, is increasingly threatened in its native range has led to the establishment of conservation programmes and protected areas throughout western Europe.
Carreck, Norman L   +11 more
core   +1 more source

Optimization research on carrier phase-shifting modulation method of cascade multi-level inverter

open access: yesGong-kuang zidonghua, 2014
The traditional carrier phase-shifting modulation method of cascade high-voltage inverter has the problems of large switching loss and low utilization rate of DC voltage, and modulation method based on combination of carrier phase-shifting and vector ...
ZHENG Zheng, YAN Fei, ZOU Jin
doaj   +1 more source

Magnetic force microscopy study of magnetization reversal in sputtered FeSiAl(N) films [PDF]

open access: yes, 2001
The magnetization reversal in a series of rf-sputtered FeSiAl(N) films has been studied using magnetic force microscopy. A system has been developed which has the capability to image domain structure while an in-plane magnetic field is applied in situ ...
Chen, R.   +8 more
core   +3 more sources

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