Results 41 to 50 of about 12,015,384 (327)

Universal flattening of Frobenius

, 2011
For a variety $X$ of positive characteristic and a non-negative integer $e$, we define its $e$-th F-blowup to be the universal flattening of the $e$-iterated Frobenius of $X$.
Yasuda, Takehiko
core   +1 more source

Representation of Distributions by Harmonic and Monogenic Potentials in Euclidean Space [PDF]

, 2014
In the framework of Clifford analysis, a chain of harmonic and monogenic potentials in the upper half of (m+1)-dimensional Euclidean space was recently constructed, including a higher dimensional analogue of the logarithmic function in the complex plane,
Brackx, Fred, De Bie, Hendrik, De Schepper, Hennie   +2 more
core   +2 more sources

Orientable and Negative Orientable Sequences

Discrete Applied Mathematics
Analogously to de Bruijn sequences, orientable sequences have application in automatic position-location applications and, until recently, studies of these sequences focused on the binary case. In recent work by Alhakim et al., a range of methods of construction were described for orientable sequences over arbitrary finite alphabets; some of these ...
Chris J. Mitchell, Peter R. Wild
openaire   +2 more sources

Negative Sequence Voltage Compensating for Unbalanced Standalone Brushless Doubly-Fed Induction Generator

IEEE transactions on power electronics, 2020
During the unbalance operation of a standalone brushless doubly-fed induction generator (BDFIG), the negative sequence component causes significant unbalanced effect on the voltage and current of the power winding (PW).
W. Xu, Omer Mohammed Elbabo Mohammed, Yi Liu, Md. Rabiul Islam   +3 more
semanticscholar   +1 more source

The negative sequence impedance as fault indicator in induction motors

Revista Facultad de Ingeniería Universidad de Antioquia, 2013
An algorithm to detect inter-turn faults in induction motors based on the negative sequence impedance is presented in this paper. The implementation through a digital prototype is also explained and its results are tested using a 3 Hp induction motor ...
Fernando Villada, Diego Raúl Cadavid, José Edinson Aedo, Bernardo Andrés Benavides, Esteban Velilla   +4 more
doaj   +3 more sources

Sequence-specific protein aggregation generates defined protein knockdowns in plants [PDF]

, 2016
Protein aggregation is determined by short (5-15 amino acids) aggregation-prone regions (APRs) of the polypeptide sequence that self-associate in a specific manner to form beta-structured inclusions.
Aesaert, Stijn, Betti, Camilla, Coutuer, Silvie, De Rycke, Riet, De Smet, Frederik, Gallardo, Rodrigo, Inzé, Dirk, Mishev, Kiril, Rombaut, Debbie, Rousseau, Frederic, Russinova, Eugenia, Schymkowitz, Joost, Van Breusegem, Frank, Van Lijsebettens, Maria, Vanhoutte, Isabelle, Vuylsteke, Marnik, Xu, Jie   +16 more
core   +2 more sources

Sequences with finitely many negative squares

Journal of Functional Analysis, 1988
Let \({\mathbb{N}}_ 0=\{all\) nonnegative integers\(\}\), \({\mathbb{Z}}=\{all\) integers including zero\(\}\), \({\mathbb{R}}=\{all\) real numbers\(\}\). The following theorems typify the nature of the results of this paper: Theorem. Suppose that the sequence \(f:{\mathbb{N}}_ 0\to {\mathbb{R}}\) has K negative squares and is polynomially determinate.
Berg, C, Christensen, J.P.R, Maserick, P.H   +2 more
openaire   +2 more sources

Positive-Negative Sequence Current Controller for LVRT Improvement of Wind Farms Integrated MMC-HVDC Network

IEEE Access, 2020
Positive and negative sequence based current control strategy is developed for the modular multilevel converter (MMC), which complies with the grid code requirements during the balanced and unbalanced faults at the point of common coupling of AC grids ...
M. Hossain, M. A. Abido
semanticscholar   +1 more source

Performance Evaluation of a Novel Sequence-Based Directional Detection Strategy for Protection of Active Distribution Networks

IEEE Access
Directional elements are relied on to achieve selectivity in fault detection in power systems. Although such elements have been deployed successfully for many years, there is an increased need for novel methods to deal with the unique challenges of ...
Kwasi Opoku, Aleksandar Dimitrovski, Maximiliano Ferrari   +2 more
doaj   +1 more source

Impact of Solar Inverter Dynamics during Grid Restoration Period on Protection Schemes Based on Negative-Sequence Components

Energies, 2022
The growing penetration of renewable resources such as wind and solar into the electric power grid through power electronic inverters is challenging grid protection.
Almir Ekic, Di Wu, John N. Jiang
doaj   +1 more source