Results 31 to 40 of about 145,387 (305)

A New Bridgeless High Step-up Voltage Gain PFC Converter with Reduced Conduction Losses and Low Voltage Stress

Energies, 2018
Bridgeless power factor correction (PFC) converters have a reduced number of semiconductors in the current flowing path, contributing to low conduction losses.
Xiang Lin, Faqiang Wang, Herbert H. C. Iu   +2 more
doaj   +1 more source

Radiative Thermal Noise for Transmissive Optics in Gravitational-Wave Detectors

, 2014
Radiative losses have traditionally been neglected in the calculation of thermal noise of transmissive optical elements because for the most commonly used geometries they are small compared to losses due to thermal conduction.
Ballmer, Stefan W., Dwyer, Sheila
core   +1 more source

A Fault-Tolerant T-Type Multilevel Inverter Topology With Increased Overload Capability and Soft-Switching Characteristics [PDF]

, 2017
he performance of a novel three-phase four-leg fault-tolerant T-type inverter topology is introduced in this paper. This inverter topology provides a fault-tolerant solution to any open-circuit and certain short-circuit switching faults in the power ...
Demerdash, Nabeel, He, Jiangbiao, Katebi, Ramin, Wei, Lixiang, Weise, Nathan   +4 more
core   +2 more sources

Large volume buildings: Calculations of heat losses due to conduction

Journal of Civil Engineering and Management, 2006
The paper covers the questions associated with heating of large‐volume buildings using gas‐fired air heaters. Particular attention is given to horizontal and vertical distribution of interior temperatures.
Iwona Polarczyk, Pawel Malinowski
doaj   +1 more source

The response of hot wires in high Reynolds-number turbulent pipe flow [PDF]

, 2004
Issues concerning the accuracy of hot-wire measurements in turbulent pipe flow are addressed for pipe Reynolds numbers up to 6 × 106 and hot-wire Reynolds numbers up to Rew ap 250. These include the optimization of spatial and temporal resolution and the
Jiang, W., Li, J. D., McKeon, B. J., Morrison, J. F., Smits, A. J.   +4 more
core   +1 more source

Efficiency Performance of 7-Level Multiplexed and 3-Level Neutral Point Clamped (NPC) Converters

Energies
In medium-voltage AC applications, multilevel converters are essential due to their ability to achieve high efficiency and significantly reduce total harmonic distortion (THD), ensuring improved performance and power quality.
Shafquat Hussain, Simone Cosso, Massimiliano Passalacqua, Luis Ramon Vaccaro, Andrea Formentini, Mario Marchesoni   +5 more
doaj   +1 more source

Investigation of FACTS devices to improve power quality in distribution networks [PDF]

, 2011
Flexible AC transmission system (FACTS) technologies are power electronic solutions that improve power transmission through enhanced power transfer volume and stability, and resolve quality and reliability issues in distribution networks carrying ...
Rehman Shaikh, Muhammad Asim, Rehman Shaikh, Muhammad Asim   +1 more
core   +1 more source

T-NPC Soft-Commutated Inverter Based on Reverse Blocking IGBTs with the Novel Concept of a DESAT Control Circuit in the Gate Driver

Energies, 2023
This article presents the concept of switching and conduction loss reduction in a T-NPC inverter based on IGBT transistors. The method of limiting switching losses involves the connection of an LC circuit designed to cause transistors in vertical ...
Andrzej Mondzik
doaj   +1 more source

Stressful Events Reported by Childhood Cancer Survivors and Community Controls From the St. Jude Lifetime (SJLIFE) Cohort: A Mixed Method Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction Characterizing stressful events reported by childhood cancer survivors experienced throughout the lifespan may help improve trauma‐informed care relevant to the survivor experience. Methods Participants included 2552 survivors (54% female; 34 years of age) and 469 community controls (62% female; 33 years of age) from the St.
Megan E. Ware, Colter K. Clayton, Fang Wang, Sedigheh Mirzaei, Kyla Shelton, Tara M. Brinkman, Victoria Willard, Katianne M. Howard Sharp, Kevin Krull, Lindsay F. Schwartz, Melissa M. Hudson, Gregory T. Armstrong, Kirsten K. Ness, Rachel T. Webster   +13 more
wiley   +1 more source

A Novel Multilevel DC-Link Three-Phase T-Type Inverter

Energies, 2020
This research proposes a four-level T-type inverter that is suitable for low-power applications. The presented topology outranks other types of inverters in terms of a smaller number of semiconductor devices, absence of passive components such as ...
Saddam Shueai Alnamer, Saad Mekhilef, Hazlie Mokhlis, Nadia M. L. Tan   +3 more
doaj   +1 more source