Zobrazeno 1 - 10
of 403
pro vyhledávání: '"ZhengMing Zhao"'
Publikováno v:
BMC Musculoskeletal Disorders, Vol 23, Iss 1, Pp 1-8 (2022)
Abstract Objective The use of cement or cementless femoral stem prosthesis for hip arthroplasty in elderly patients has been controversial. This study investigated the efficacy and safety of cementless femoral stem in elderly patients (age ≥ 65 yea
Externí odkaz:
https://doaj.org/article/ea42ebde7a3544ea81169222bab34bcc
Publikováno v:
Asian Journal of Surgery, Vol 46, Iss 9, Pp 4038-4039 (2023)
Externí odkaz:
https://doaj.org/article/2b521ff13f3a4b3eb863712c1f399d67
Publikováno v:
iEnergy, Vol 1, Iss 2, Pp 243-256 (2022)
A low-voltage ride-through (LVRT) control strategy for the multi-port power electronic transformer (PET) based on power co-regulation is proposed. During the sag and recovery of the grid-side voltage of the medium-voltage ac (MVac) port, the grid-con
Externí odkaz:
https://doaj.org/article/26d5bbc3d3944c1a8cf287076dee205d
Publikováno v:
IEEE Access, Vol 9, Pp 28573-28581 (2021)
Power electronic systems are intrinsically hybrid systems, consisting of continuous states and discrete events. The hybrid nature makes their accurate and efficient simulation challenging to achieve. A novel approach called discrete state event-drive
Externí odkaz:
https://doaj.org/article/ae829d3244fd4ea680ab53c5716491cb
Publikováno v:
IEEE Access, Vol 9, Pp 108329-108339 (2021)
Solid-state transformers (SSTs) enable electric energy distribution with higher flexibility, sustainability and efficiency, and the AC/DC hybrid microgrid (MG) is one of the representative applications. However, the design and analysis of SSTs and MG
Externí odkaz:
https://doaj.org/article/a2ff2bed86d84a61bb7a749f2b580253
Publikováno v:
IEEE Access, Vol 9, Pp 122207-122215 (2021)
In hard-switching applications, insulated gate bipolar transistors (IGBTs) always suffer from harmful turn-off peak voltages. To switch the devices safely, it is a common practice to use large enough drive resistances in conventional gate drives (CGD
Externí odkaz:
https://doaj.org/article/d65ff1a3f8634ce08a8b52e9672cb1b1
Publikováno v:
CES Transactions on Electrical Machines and Systems, Vol 4, Iss 4, Pp 275-284 (2020)
At present, power electronic transformers (PETs) have been widely used in power systems. With the increase of PET capacity to the megawatt level. the problem of increased losses need to be taken seriously. As an important indicator of power electroni
Externí odkaz:
https://doaj.org/article/37fa12360ce14665ae011778201165e5
Autor:
Zhengming Zhao
Publikováno v:
iEnergy, Vol 1, Iss 1, Pp 11-11 (2022)
Externí odkaz:
https://doaj.org/article/c5c1f89c0c254657af4729539c0c7e7e
Publikováno v:
CES Transactions on Electrical Machines and Systems, Vol 1, Iss 3, Pp 273-282 (2017)
In the analysis of power electronics system, it is necessary to simulate ordinary differential equations (ODEs) with discontinuities and stiffness. However, there are many difficulties in using traditional discrete-time algorithms to solve such equat
Externí odkaz:
https://doaj.org/article/7e16ee3779194b3fadf774d2c55cd74f
Autor:
Chunpeng Zhang, Zhengming Zhao
Publikováno v:
CES Transactions on Electrical Machines and Systems, Vol 1, Iss 3, Pp 315-321 (2017)
Power electronic zigzag transformer is an attractive solution for the flexible interconnection of smart distribution networks. It is constituted by slow-response and low-precision thyristor converters and fast-response and high-accuracy voltage sourc
Externí odkaz:
https://doaj.org/article/1374bcd6534c489cacfad0f0ed01c837