Results 11 to 20 of about 1,809,050 (267)
Eletrônica de Potência, 2006 This paper proposes a new open-loop synchronization method for three-phase three-wire PWM converters connected to the utility grid. It presents a good performance under unbalanced and highly distorted grid voltages.
Robinson F. de Camargo +1 more
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BMC Plant Biology, 2023 Background Subtribe Swertiinae, a medicinally significant and highly speciose Subtribe of family Gentianaceae. Despite previous extensive studies based on both morphology and molecular data, intergeneric and infrageneric relationships within subtribe ...
Lucun Yang +3 more
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Current decoupling control strategy for unbalanced input 3-1 matrix converter
工程科学学报, 2017 The reasons for low-order harmonics in the input current of a 3-1 matrix converter (3-1MC) were analyzed, and the relationship of modulation function between the output side and power compensation side was derived.
XU Yu-xiang +3 more
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A sequence of positive solutions for sixth-order ordinary nonlinear differential problems
Electronic Journal of Qualitative Theory of Differential Equations, 2021 Infinitely many solutions for a nonlinear sixth-order differential equation are obtained. The variational methods are adopted and an oscillating behaviour on the nonlinear term is required, avoiding any symmetry assumption.
Gabriele Bonanno, Roberto Livrea
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The Performance of a Three-Phase Induction Motor under and over Unbalance Voltage
Tikrit Journal of Engineering Sciences, 2022 Voltage unbalance is an adverse global phenomenon impacting three-phase induction motor output. Three-phase source voltage may become imbalanced in a variety of respects, while a balanced system preserves stable voltage magnitude and angles in three ...
Abdulsatar H. Jassim +2 more
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On the Generating Functions of Totally Positive Sequences [PDF]
Proceedings of the National Academy of Sciences, 1951 A real matrix, finite or infinite, is called totally positive if and only if all its minors, of all orders = 1, 2,..., are non-negative. An infinite sequence $$ {a_0},{a_1},{a_2}, \ldots ,\quad \left( {{a_0} = 1} \right), $$ is said to be totally positive(2) if and only if the 2-way infinite matrix Open image in new window is totally ...
Aissen, Michael +3 more
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Positivity of Iterated Sequences of Polynomials [PDF]
SIAM Journal on Discrete Mathematics, 2018 In this paper, we present some criteria for the $2$-$q$-log-convexity and $3$-$q$-log-convexity of combinatorial sequences, which can be regarded as the first column of certain infinite triangular array $[A_{n,k}(q)]_{n,k\geq0}$ of polynomials in $q$ with nonnegative coefficients satisfying the recurrence relation $$A_{n,k}(q)=A_{n-1,k-1}(q)+g_k(q)A_{n-
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Positive solutions for nonlinear fractional differential equation with nonlocal boundary conditions
Universal Journal of Mathematics and Applications, 2018 In this paper, we study the boundary value problem of a class of fractional differential equations involving the Riemann-Liouville fractional derivative with nonlocal integral boundary conditions. To establish the existence results for the given problems,
Bouteraa Noureddine +2 more
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Admissible sequences of positive operators
Transactions of the American Mathematical Society, 2018 A scalar sequence ξ \xi is said to be ...
Kaftal, Victor, Larson, David R.
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Positivity of Three-Term Recurrence Sequences [PDF]
The Electronic Journal of Combinatorics, 2010 In this paper, we give the sufficient conditions for the positivity of recurrence sequences defined by $$a_nu_{n}=b_nu_{n-1}-c_nu_{n-2}$$ for $n\geqslant 2$, where $a_n,b_n,c_n$ are all nonnegative and linear in $n$. As applications, we show the positivity of many famous combinatorial sequences.
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