Results 91 to 100 of about 95,064 (281)

Investigation and analysis of interleaved dc-dc boost converter for grid-connected photovoltaic energy system

open access: yesMANAS: Journal of Engineering, 2023
The installation of photovoltaic energy system has been increasing in recent years with the increment of the demand to the electrical power. PV system can be installed as either standalone or grid-connected.
Mehmet Buyuk
doaj  

A comprehensive analysis of SVPWM for a Five-phase VSI based on SiC devices applied to motor drives [PDF]

open access: yes, 2019
© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new ...
Acosta Cambranis, Fernando Geovany   +2 more
core   +1 more source

Static and Dynamic Analysis of Porous Gas Bearings Lubricated With Air, Refrigerant R‐134a, Helium and Hydrogen

open access: yesLubrication Science, EarlyView.
ABSTRACT Porous gas bearings (PGBs) enable high‐speed, oil‐free operation in modern rotating machinery. This study develops a coupled thermo‐hydrodynamic (THD) model for a cylindrical porous gas bearing lubricated with four working fluids—air, R‐134a, helium and hydrogen.
S. Bechiri, B. Bouchehit, B. Bou‐Saïd
wiley   +1 more source

Construction and Application of Online Vibration Frequency Response Analysis Method for Converter Transformer Winding

open access: yesHigh Voltage, EarlyView.
ABSTRACT The harmonic current and vibration of a converter transformer are effective pieces of information for detecting mechanical faults in the winding. In this paper, the ratio of vibration acceleration to the current squared is defined as the vibration frequency response function (VFRF) of the winding, and then, a novel online vibration frequency ...
Shuyu Wu, Fan Zhang, Shengchang Ji
wiley   +1 more source

Evolution of kinklike fluctuations associated with ion pickup within reconnection outflows in the Earth's magnetotail

open access: yes, 2009
Magnetic reconnection (MR) in Earth's magnetotail is usually followed by a systemwide redistribution of explosively released kinetic and thermal energy.
A. Runov   +11 more
core   +1 more source

Assessing Major Adverse Liver Outcomes With Baclofen Compared to Acamprosate in Compensated Alcohol‐Associated Cirrhosis

open access: yesAlimentary Pharmacology &Therapeutics, EarlyView.
We conducted a nationwide, multicenter cohort study using a target trial emulation framework to compare baclofen and acamprosate in patients with compensated alcohol‐associated cirrhosis. After matching, baclofen initiation was associated with a higher 1‐year risk of major adverse liver outcomes, driven primarily by hepatic encephalopathy, particularly
Yee Hui Yeo   +13 more
wiley   +1 more source

Performance comparison between optimization algorithms for asymmetrical cascaded multilevel inverter control

open access: yesAutomatika, 2020
This paper discusses the hardware and control system design of the asymmetric cascade multilevel inverter. The asymmetric cascaded multilevel inverter structure is adopted to minimize bridges, gate drive circuits and DC power source number.
Lazhar Manai, Faouzi Armi, Mongi Besbes
doaj   +1 more source

Topics as Outcomes: Modeling the Influence of Intergovernmental Grants on Policy Diffusion

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT Intergovernmental grants stimulate the diffusion of policy reforms, as the federal government provides states with a financial incentive to adopt policies aligned with federal priorities. Less is known about the extent to which these grants also stimulate horizontal diffusion across states.
NaLette Brodnax, Sarah James
wiley   +1 more source

Classifying Superconductivity in ThH-ThD Superhydrides

open access: yes, 2019
Satterthwaite and Toepke (1970 Phys. Rev. Lett. 25 741) discovered that Th4H15-Th4D15 superhydrides exhibit superconductivity and have no isotope effect. The latter is fundamental contradiction with the concept of electron-phonon mediated superconductivity of Bardeen-Cooper-Schrieffer (BCS) theory.
openaire   +2 more sources

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