Results 41 to 50 of about 16,769 (309)

De la gestion des contraintes de commutation à la commutation douce

, 2008
Cet article a pour objet l’étude des contraintes de commutation. En pratique, les composants semi-conducteurs, avec leurs caractéristiques et leurs imperfections, impactent grandement les paramètres de fonctionnement de la cellule, comme la vitesse de ...
Foch, Henri, Meynard, Thierry, Richardeau, Frédéric, Metz, Michel, Piquet, Hubert   +4 more
core   +2 more sources

GPS-Free Wireless Precise Positioning System for Automatic Flying and Landing Application of Shipborne Unmanned Aerial Vehicle

Sensors
This research is dedicated to developing an automatic landing system for shipborne unmanned aerial vehicles (UAVs) based on wireless precise positioning technology.
Tsu-Yu Lo, Je-Yao Chang, Tan-Zhi Wei, Pin-Yen Chen, Shih-Ping Huang, Wei-Ting Tsai, Chong-Yi Liou, Chun-Cheng Lin, Shau-Gang Mao   +8 more
doaj   +1 more source

Interaction influence of harmonics in MIDC transmission systems

The Journal of Engineering, 2019
Owing to the particular distribution of energy and load, the high-voltage direct current transmission system has been greatly developed in China. A number of areas have formed the multi-infeed direct current (MIDC) transmission systems.
Wang Ling, Chen Dong, Xue Yinglin, Wu Fangjie   +3 more
doaj   +1 more source

Commutation failure caused by AC filter switching In HVDC system

The Journal of Engineering, 2019
Switching AC filter may cause harmonic impact, which may lead to commutation failure of HVDC system. Here, the commutation failure mechanism of HVDC system caused by AC filter switching is studied.
Meng Liu, Lei Zheng, Fangfang Shi, Kuan Li   +3 more
doaj   +1 more source

COMMUTATIVITY THEOREMS FOR RINGS WITH CONSTRAINTS ON COMMUTATORS

Tamkang Journal of Mathematics, 1995
Let $R$ be a left (resp. right) $s$-unital ring and $m$ be a positive integer. Suppose that for each $y$ in $R$ there exist $J(t)$, $g(t)$, $h(t)$ in $Z[t]$ such that $x^m[x,y]= g(y)[x,y^2f(y)]h(y)$ (resp. $[x,y]x^m= g(y)[x,y^2f(y)]h(y))$ for all $x$ in $R$. Then $R$ is commutative (and conversely).
Abujabal, H. A. S., Ashraf, Mohd.
openaire   +3 more sources

Arc root commutation from moving contacts in low voltage devices

, 2000
This paper focus on the arc commutation from a moving contact and in particular on the anode motion of a high current arc in low voltage current limiting circuit breakers.
Weaver, P.M., J.W. McBride, Pechrach, K., K. Pechrach, McBride, J.W., P.M. Weaver   +5 more
core   +1 more source

Solution to reduce voltage stress of sub-module in LCC–MMC transmission system at the condition of communication fault

The Journal of Engineering, 2018
Line commutate converter–modular multilevel converter (LCC–MMC) hybrid high voltage direct current (HVDC) system combines the advantages of both LCC-HVDC and MMC-HVDC, and will be wildly used in the future.
Dengjiang Xing, Jianjun Su, Dingwen Hu, Shumin Sun, Yan Chen, Xianwei Wang, Jun Zhang, Weizheng Yao, Jinlong Wu   +8 more
doaj   +1 more source

Line‐of‐sight probability for UAV communications in 3D grid urban streets

Electronics Letters, 2023
In this letter, the authors present a novel expression for the probability of line‐of‐sight (LoS) between a UAV and ground users situated on a gridded street within urban and dense urban environments.
Mengan Song, Zhonghua Liang, Yiming Huo, Ren Liu   +3 more
doaj   +1 more source

A Highly Efficient Single-Phase Three-Level Neutral Point Clamped (NPC) Converter Based on Predictive Control with Reduced Number of Commutations

Energies, 2018
This paper proposes a highly efficient single-phase three-level neutral point clamped (NPC) converter operated by a model predictive control (MPC) method with reduced commutations of switches. The proposed method only allows switching states with none or
Eun-Su Jun, Sangshin Kwak
doaj   +1 more source

On commuting and semi-commuting positive operators [PDF]

Proceedings of the American Mathematical Society, 2014
Let K K be a positive compact operator on a Banach lattice. We prove that if either
openaire   +2 more sources