Results 61 to 70 of about 142,078 (293)

Simulation of commutation process DC traction motor of quarry dump truck [PDF]

open access: yesОмский научный вестник, 2020
The article considers a nonlinear multiple regression model based on which a model of the commutation process of the DC traction motor of a quarry dump truck.
V. V. Kharlamov   +2 more
doaj   +1 more source

Weak commutation relations of unbounded operators: nonlinear extensions

open access: yes, 2012
We continue our analysis of the consequences of the commutation relation $[S,T]=\Id$, where $S$ and $T$ are two closable unbounded operators. The {\em weak} sense of this commutator is given in terms of the inner product of the Hilbert space $\H$ where ...
Antoine J.-P.   +6 more
core   +1 more source

Young children's right to be heard on the quality of their education: Addressing potential misunderstandings in the context of early childhood education

open access: yesBritish Educational Research Journal, EarlyView.
Abstract In early childhood education many researchers and professionals across the world have embraced the United Nations Convention on the Rights of the Child's requirement to include young children in decision‐making. In the context of ongoing discussion about young children's capacity to share their views and opinions about matters affecting them ...
Laura Lundy   +3 more
wiley   +1 more source

A Quantitative Index to Evaluate the Commutation Failure Probability of LCC-HVDC with a Synchronous Condenser

open access: yesApplied Sciences, 2019
Since thyristor cannot turn off automatically, line commutated converter based high voltage direct current (LCC-HVDC) will inevitably fail to commutate and therefore auxiliary controls or voltage control devices are needed to improve the commutation ...
Jiangbo Sha   +3 more
doaj   +1 more source

Exactness of the Fock space representation of the q-commutation relations

open access: yes, 2010
We show that for all q in the interval (-1,1), the Fock representation of the q-commutation relations can be unitarily embedded into the Fock representation of the extended Cuntz algebra.
A. Nou   +11 more
core   +1 more source

Making teaching an attractive profession: What are the challenges and opportunities for minority ethnic teachers in England?

open access: yesBritish Educational Research Journal, EarlyView.
Abstract This paper explores the challenges and opportunities surrounding the recruitment and retention of minority ethnic teachers in England. Drawing on interview data from 33 teachers and school leaders of diverse ethnic backgrounds, it investigates whether racialised barriers identified in earlier research have shifted in the current context of ...
Antonina Tereshchenko   +5 more
wiley   +1 more source

Two-channel microwave power switch construction on the basis of electrically active semiconductor structures

open access: yesTekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2014
When constructing the fast-acting two-channel microwave switch, it is difficult to use p–i–n-diodes due to inertia of processes in such structures at change of control voltage polarity for providing of deep modulation.
Yu. N. Lavrich   +4 more
doaj   +1 more source

The Problem of Constructing the Current Operators in Quantum Field Theory [PDF]

open access: yes, 1995
Lorentz invariance of the current operators implies that they satisfy the well-known commutation relations with the representation operators of the Lorentz group.
Lev, Felix M.
core   +2 more sources

A mechanism for unipolar resistance switching in oxide non-volatile memory devices

open access: yes, 2007
Building on a recently introduced model for non-volatile resistive switching, we propose a mechanism for unipolar resistance switching in metal-insulator-metal sandwich structures.
Baek I. G.   +4 more
core   +1 more source

N-commutators

open access: yesCommentarii Mathematici Helvetici, 2004
Consider an associative algebra of differential operators in \(n\) indeterminates (with smooth or polynomial coefficients) with respect to composition. Its subspace \(W(n)\) of vector fields (i.e. first-order differential operators) constitutes a famous Lie algebra of general Cartan type with respect to commutator.
openaire   +2 more sources

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