Results 31 to 40 of about 776,968 (306)

Resonant symmetry lifting in a parametrically modulated oscillator

, 2006
We study a parametrically modulated oscillator that has two stable states of vibrations at half the modulation frequency $\omega_F$. Fluctuations of the oscillator lead to interstate switching.
D. Ryvkine, J. Guckenheimer, L. D. Landau, M. I. Dykman, M. I. Dykman, M. I. Freidlin   +5 more
core   +1 more source

Switching control between variable frequency and power frequency of emulsion pump in coal mine

Gong-kuang zidonghua, 2017
In view of problem of high impulse current when scheme of multiple pumps linkage with one frequency converter applied in coal mine emulsion pump station, asynchronous switching and synchronous switching control scheme between variable frequency and power
FU Xiang, WANG Ranfeng, YUAN Jicheng, DONG Zhiyong   +3 more
doaj   +1 more source

Improved carrier phase shift modulation and voltage equalization control strategy in modular multilevel converter [PDF]

Archives of Electrical Engineering, 2019
In order to solve the problem of traditional carrier phase-shift modulation with multiple ratios or PI controllers and cumbersome tuning parameters, this paper uses improved carrier phase-shift modulation.
Hongtao Jin, Yinghong Luo, Yuheng Fan, Shengxiong Pan   +3 more
doaj   +1 more source

Comparison of Hysteresis Based PWM Schemes ΔΣ-PWM and Direct Torque Control

Applied Sciences, 2021
This paper presents the differences and similarities of ΔΣ-PWM as a hysteresis-based PWM scheme with direct torque control (DTC) using simulation models.
Kevin Klarmann, Malte Thielmann, Walter Schumacher   +2 more
doaj   +1 more source

X-ray-frequency modulation via periodic switching of an external magnetic field

, 2018
Single x-ray photons can be resonantly scattered and stored with the help of suitable transitions in the atomic nucleus. Here, we investigate theoretically means of mechanical-free modulation for the frequency spectra of such x-ray photons via periodic ...
Gunst, Jonas, Kong, Xiangjin, Pálffy, Adriana, Ramien, Gregor   +3 more
core   +1 more source

A Design of a 100-MHz Fully Integrated Digital Pulse Width Modulation Three-Level Buck Converter Using Package Bond-Wire Inductor

IEEE Access
This paper presents a fully integrated digital pulse-width-modulation three-level DC-DC buck converter. An internal switching frequency of 100 MHz is selected to minimize the value of passive components, and the package bond-wire based inductor is ...
Sung-Jae Lee, Ju Hyoung Kim, Yun-Gwan Kim, Jeong Seop Lee, Ji Hoon Song, Dong Gyun Kim, Jong-Wan Jo, Young-Gun Pu, Kang-Yoon Lee, Jun-Eun Park   +9 more
doaj   +1 more source

Frequency shifting with a solid-state switching capacitor [PDF]

, 1973
Frequency shifting, commonly used in electronic signal processing, is applied in tuning, automatic frequency control, antenna element switching, phase shifting, etc.
Mattauch, R. J., Viola, T. J., Jr.
core   +1 more source

Fatigue effect in ferroelectric crystals: Growth of the frozen domains [PDF]

, 2012
The model of the fatigue effect during cyclic switching caused by growth of the frozen domain area with charged domain walls has been proposed. It was claimed on the basis of the previous experimental results that for switching in increasing field the ...
Akhmatkhanov, A. R., Baturin, I. S., Shur, V. Ya., Шур, В. Я.   +3 more
core   +1 more source

Why and When Are Evidence‐Based Interventions Adopted in Paediatric Supportive Care? A Qualitative Exploration of the Determinants of Photobiomodulation Implementation

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Oral mucositis is a common and debilitating side effect of childhood cancer and stem cell transplant treatments. It affects the quality of life of children and young people (CYP) and places a strain on services. Photobiomodulation is recommended for oral mucositis prevention in international guidance but is poorly implemented in UK ...
Claudia Heggie, Kara A. Gray‐Burrows, Peter F. Day, Bob Phillips, Carl A. Thompson   +4 more
wiley   +1 more source

FLEXIBLE SYNCHRONOUS REGULATION OF POWER ELECTRONIC BLOCKS OF TRANSFORMER-BASED PHOTOVOLTAIC STATIONS

Journal of Engineering Science (Chişinău)
The paper presents the results of developing a scheme for synchronous pulse-width modulation (PWM) of signals in dual voltage source diode-clamped inverters (VSDCIs) used in grid-tied, transformer-based photovoltaic (PV) stations.
OLESCHUK, Valentin
doaj   +1 more source