Results 61 to 70 of about 178,348 (364)

The Future of Hydrogen‐Powered Aviation: Technologies, Challenges, and a Strategic Roadmap for Sustainable Decarbonization

Advanced Energy and Sustainability Research, EarlyView.
Hydrogen‐powered aviation offers a transformative pathway to zero‐emission flight by eliminating in‐flight CO2 emissions. Key considerations include propulsion systems (fuel cells and hydrogen combustion), cryogenic storage and insulation challenges, infrastructure and cost barriers, and supply‐chain constraints.
Mubasshira, Md Mahbubur Rahman, Karib Hassan Khan, Md Nizam Uddin, Dewan Hafiz Nabil   +4 more
wiley   +1 more source

Research on the characteristics of multi-infeed DC system with hybrid commutation converter suppressing successive commutation failure

International Journal of Electrical Power & Energy Systems
In view of the problem of successive commutation failure in multi-infeed direct current systems, this paper investigates the commutation characteristics of hybrid commutation convert technology and its application in mitigating successive commutation ...
Jian Cui, Zhichang Yuan, Kangsheng Cui, Long Zhang, Pengbo Zhao, Zhanqing Yu, Xiaoguang Wei, Xuejiao Han   +7 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

Spacetime is for SU(2) [PDF]

, 2010
The generators of rotations, boosts and translations are built up based on the commutation and anticommutation relations of the fundamental two dimensional representation of SU(2).
Shurtleff, Richard
core  

Soliton Solutions of the Toda Hierarchy on Quasi-Periodic Backgrounds Revisited

, 2007
We investigate soliton solutions of the Toda hierarchy on a quasi-periodic finite-gap background by means of the double commutation method and the inverse scattering transform.
Alonso, Egorova, Egorova, Egorova, Forest, Gesztesy, Gesztesy, Kamvissis, Kuznetsov, Lax, Pełka, Rubenstein, Shin, Shin, Teschl, Teschl, Teschl   +16 more
core   +1 more source

Participation for mental health service development in China: Conditions, challenges, facilitators, and outcomes

American Journal of Community Psychology, EarlyView.
Abstract This study analyzes a participatory project to develop peer support services for people with serious mental illnesses (SMIs) in China. Drawing on interviews with psychiatrists, social workers, service users, and a family caregiver, it examines the conditions, challenges, facilitators, and outcomes of participation in a paternalistic context ...
Zhiying Ma, Yu Fan, Xiyuan Chen, Lindsay Sheehan, Sang Qin, Aoxuan Cao, Liang Zhou   +6 more
wiley   +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

Supersymmetric Canonical Commutation Relations

, 2005
We present unitarily represented supersymmetric canonical commutation relations which are subsequently used to canonically quantize massive and massless chiral,antichiral and vector fields.
FLORIN CONSTANTINESCU, Grigore D. R., Srivastava P. P., Strocchi F., Wess J.   +4 more
core   +4 more sources

An Alternative Approach to Spontaneous Photon Triplets Generation

Advanced Physics Research, EarlyView.
Day by day, communication and computing technologies are progressing at a lightning speed, which is particularly true of the quantum version of these technologies (QIST). Increasingly, these technologies are emerging from unusual and sometimes bewildering quantum optical effects, which are based on exotic quantum physical theories.
Serge Gauvin
wiley   +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