نتایج جستجو برای: subsynchronous resonance

تعداد نتایج: 214504  

Journal: :iranian journal of radiology 0
huseyin ozkurt department of radiology, sisli etfal education and research hospital, istanbul, turkey; department of radiology, sisli etfal education and research hospital, istanbul, turkey. tel: +90-5325958625, fax: +90-2122965467, e-mail:[email protected] firat keskiner department of radiology, sisli etfal education and research hospital, istanbul, turkey ozan karatag department of radiology, canakkale onsekiz mart university faculty of medicine, canakkale, turkey canan alkim department of gastroenterology, sisli etfal education and research hospital, istanbul, turkey sukru mehmet erturk department of radiology, sisli etfal education and research hospital, istanbul, turkey muzaffer basak department of radiology, sisli etfal education and research hospital, istanbul, turkey

background hepatic fibrosis is a typical complication of chronic liver diseases resulting in cirrhosis that remains a major public health problem worldwide. liver biopsy is currently the gold standard for diagnosing and staging hepatic fibrosis. percutaneous liver biopsy; however, is an invasive procedure with risks of complications. therefore, there is need for alternative non-invasive techniq...

2013
Toshiyuki Fujii Hiroyuki Masuda Yoshihiro Ogashi Masahiko Tsukakoshi Makoto Yoshimura

Electrical drives for large capacity compressors in a liquefied natural gas (LNG) plant have been investigated. There are mainly two topologies for such an electrical drive; load commutated inverters (LCIs) and voltage source inverters (VSIs). Due to commutation of the thyristors, LCIs produce current harmonics with variable frequencies, and their interharmonics are significant. Therefore, tors...

2017
Benfeng Gao Ruixue Zhang Ren Li Hongyang Yu Guoliang Zhao

High-voltage direct current (HVDC) lines with line-commutated converter (LCC) are being increasingly employed to transmit bulk wind power over long distance. However, this may cause the sub-synchronous torsional interaction (SSTI) between the wind farms and the LCC-HVDC system. The SSTI characteristics of wind farms with fixed-speed induction generator (FSIG) wind turbines connected to LCC-HVDC...

Journal: :Tribology in industry 2023

Gas foil bearing rotor (GFBR) systems have received significant interest in the field of rotordynamics and vibration analysis. GFBR a wide range high-speed turbomachinery applications. Due to high speed, these machines are susceptible rigorous instability. bearings instigate large amplitude vibrations at startup shut down severe subsynchronous motions during operations. Over years, numerous wor...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم پایه 1390

در این تحقیق اتصال پپتیدی نانولوله به صفحات گرافن مورد بررسی قرار گرفته است. از میان جنبه های مختلف قابل بررسی برای این ساختارها، مطالعات ساختاری، مطالعات مربوط به انرژی تشکیل پیوند، مطالعاتnmr) )neuclear magnetic resonance و nuclear quadrupole resonance (nqr)و molecular electrostatic potential (mep)، مطالعات مربوط به شکاف انرژی (band gap)هریک از این هیبریدهای نانولوله - گرافن و همچنین بررسی ان...

Journal: :Frontiers in Energy Research 2021

In the northwest of China, a strategy to transmit wind-thermal–bundled power from local grid and doubly fed induction generator (DFIG)–based wind farms through voltage source converter–based HVDC (VSC-HVDC) can be widely applied. However, since is usually weak, new type electrical oscillation in medium-frequency region may occur sending-end converter (SEC) VSC-HVDC with PQ-control. The mechanis...

Journal: :amirkabir international journal of electrical & electronics engineering 2015
f. a. namin

metallic nanoparticles can exhibit very large optical extinction in the visible spectrum due to localized surface plasmon resonance. spherical plasmonic nanoparticles have been the subject of numerous studies in recent years due to the fact that the scattering response of spheres can be analytically evaluated using mie theory. however a major disadvantage of metallic spherical nanoparticles is ...

Journal: :IEEE Transactions on Smart Grid 2021

Subsynchronous Interaction (SSI) phenomenon is known to be one of the most frequent and severe stability issues a Wind Park (WP), can potentially lead significant loss power generation. The broad impacts this on grid have made WPs interesting targets for cyber attacks. To initiate SSI, an adversary target either (external attacks) or system (internal attacks). This paper proposes mitigation sch...

R Hassannejad, Sh Amiri Jahed

In this paper, the effect of the crack on dynamic behavior of cracked micro-beam in the presence of DC and AC loads are investigated. By applying the residual axial stress and fringing field stress, a nonlinear analytical model of cracked micro-beam is presented and crack is modeled by a massless rotational spring. The governing equation of the system is solved using Galerkin procedure and shoo...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید