Results 101 to 110 of about 25,508 (290)
Energies, 2019 Ultra-high voltage direct current (UHVDC) systems under hierarchical connection schemes (HCSs) linked to AC grids with different voltage levels (500 and 1000 kV) have been a great concern for power utilities to transfer bulk power.
Atiq Ur Rehman +2 more
doaj +1 more source
Towards a quantum theory of de Sitter space
, 2006 We describe progress towards constructing a quantum theory of de Sitter space in four dimensions. In particular we indicate how both particle states and Schwarzschild de Sitter black holes can arise as excitations in a theory of a finite number of ...
A. Ashtekar +15 more
core +1 more source
Advocating for Native‐Centric Financial Aid: Lessons From the Native Student Aid Portal
New Directions for Student Services, EarlyView.ABSTRACT Native‐centric financial aid is an essential tool promoting college access and success for Native American students and a component of Native nation building. Yet, a small but growing body of literature indicates existing financial aid opportunities do not fully meet the lived realities of Native students. This article offers insights from the
Misti R. Jeffers, Gresham D. Collom
wiley +1 more source
Quons, an interpolation between Bose and Fermi oscillators [PDF]
After a brief mention of Bose and Fermi oscillators and of particles which obey other types of statistics, including intermediate statistics, parastatistics, paronic statistics, anyon statistics, and infinite statistics, I discuss the statistics of ...
Greenberg, O. W.
core +1 more source
Wildlife Biology, EarlyView.Abundant deer populations often cause conflicts in suburban communities, yet traditional population reduction methods, such as controlled hunting, can be challenging to implement. Fertility control, specifically through ovariectomy, can limit reproduction and reduce populations in certain settings, but its effect on movement behavior remains poorly ...
Vickie DeNicola +2 more
wiley +1 more source
Multiterminal High‐Voltage Direct Current Projects: A Comprehensive Assessment and Future Prospects
High Voltage, EarlyView.ABSTRACT Multiterminal high‐voltage direct current (MT‐HVDC) systems are an important part of modern power systems, addressing the need for bulk power delivery and efficient renewable energy integration. This paper provides a comprehensive overview of recent advances in MT‐HVDC technology, including launched projects and ongoing initiatives.
Mohammad Hossein Mousavi +3 more
wiley +1 more source
CSEE Journal of Power and Energy Systems, 2019 Hierarchical connection (HC) is a very attractive mode for ± 800 kV line commutated converter based ultra high voltage direct current (LCC-UHVDC) system connected to different AC voltage levels because of its ability to reduce the scale factor of a ...
Ali Aamir +4 more
doaj +1 more source
IEEJ Transactions on Industry Applications, 2007 This paper proposes the safest novel commutation method for a matrix converter. There are two conventional commutation methods which depend on the polarity of the input line voltage (it is called “voltage commutation”) and depend on the polarity of the output current (it is called “current commutation”).
Koji Kato, Jun-ichi Itoh
openaire +2 more sources
High Voltage, EarlyView.ABSTRACT This paper presents a simplified equivalent circuit model (ECM) for the post‐arc sheath stage in DC vacuum circuit breakers and outlines the method for calculating circuit parameters using the particle‐in‐cell Monte Carlo collision (PIC‐MCC) method. The post‐arc sheath is modelled as a parallel combination of a variable resistor and a variable
Xubin Li +5 more
wiley +1 more source
Analysis of Transient Voltage-Frequency Dynamic Coupling Mechanism of High-Proportion Renewable Energy Sending End System Under Commutation Failure Faults [PDF]
Dianli jianshe[Objective] Aiming at the new challenge of unclear transient voltage and system frequency operation risks faced by sending-end power systems with a high proportion of renewable energy after commutation failure， this paper reveals the dynamic coupling ...
GAO Shang, YIN Chunya, LIU Wan, LI Xiaozhu, HAN Lu, ZHANG Gaohang
doaj +1 more source