Zobrazeno 1 - 10
of 517
pro vyhledávání: '"Frequency instability"'
Publikováno v:
Photonics, Vol 11, Iss 7, p 587 (2024)
High-precision time–frequency is widely used in time measurement, satellite navigation, scientific research, and other fields. With the rapid development of optical clock technology, the fractional frequency instability and uncertainty of optical c
Externí odkaz:
https://doaj.org/article/d9352a5d560d47a5a4539efb52b46fce
Publikováno v:
Zhejiang dianli, Vol 42, Iss 7, Pp 1-8 (2023)
The flexible DC transmission system is connected to the island grid， so the control mode needs to be changed according to the AC topology. In the process of grid-connected and island operation conversion， there are phenomena such as excessive dis
Externí odkaz:
https://doaj.org/article/1040e5971af64e9a8a0e72fe9d4bcb11
Publikováno v:
Aerospace, Vol 10, Iss 11, p 932 (2023)
This study numerically investigated the combustion instability and characteristics of a laboratory-scale gaseous hydrogen-fueled scramjet combustor. For this purpose, a numerical simulation with an improved detached eddy simulation and a detailed hyd
Externí odkaz:
https://doaj.org/article/4d842a35a6de4260a103c4a8ff1cbcbd
Autor:
Victor D. Hair
Publikováno v:
IEEE Access, Vol 10, Pp 124130-124153 (2022)
Mid-frequency instability (MFI) generally limits the application of step motors with constant-voltage drive to a speed range well below the theoretical limit imposed by inductance, back EMF, and friction torque. Analytical studies of MFI in specific
Externí odkaz:
https://doaj.org/article/e4d067ac9912497dbd794f5fe1c9fd36
Autor:
Sohail Sarwar, Hazlie Mokhlis, Mohamadariff Othman, Hussain Shareef, Li Wang, Nurulafiqah Nadzirah Mansor, Anis Salwa Mohd Khairuddin, Hasmaini Mohamad
Publikováno v:
Alexandria Engineering Journal, Vol 61, Iss 1, Pp 659-674 (2022)
Distributed Generation (DG) integration, especially based on renewable energy resources, has gained great attention by power utilities and frequently utilized in the electrical distribution systems. However, DG integration imposes some risks towards
Externí odkaz:
https://doaj.org/article/deccbb155262470a848af4f0c5d3aac1
Publikováno v:
Моделирование и анализ информационных систем, Vol 28, Iss 4, Pp 452-461 (2021)
Research in the field of efficient frequency estimation algorithms is of great interest. The reason for this is the redistribution of the role of additive and phase noise in many modern radio-engineering applications. An example is the area of measur
Externí odkaz:
https://doaj.org/article/4d8288b7e74a49f5810e41516023d989
Publikováno v:
Frontiers in Earth Science, Vol 10 (2022)
A multi-transmitting boundary is a local artificial boundary widely used for numerically simulating seismic site effects. However, similar to other artificial boundaries, the multi-transmitting boundary has instability issue in numerical simulation.
Externí odkaz:
https://doaj.org/article/9ddde5dcbd9f4d38a6405f5b002bbfc0
Autor:
Abdullah M. Eial Awwad, Mahmoud M. S. Al-Suod, Alaa M. Al-Quteimat, O.O. Ushkarenko, Atia AlHawamleh
Publikováno v:
International Journal of Electronics and Telecommunications, Vol vol. 67, Iss No 3, Pp 371-377 (2021)
The paper suggests an improved method of active power distribution among the gas-diesel generators operating in parallel; the method involves the control of torque and the angular positions of their rotors. The use of the suggested approach to the so
Externí odkaz:
https://doaj.org/article/5c54880171a1420ebd1513595269231f
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Autor:
Chenxia Liu, Jianming Shang, Zhuoze Zhao, Hao Gao, Jinting Cong, Junjie Shi, Bin Luo, Xing Chen, Song Yu
Publikováno v:
IEEE Photonics Journal, Vol 13, Iss 1, Pp 1-8 (2021)
In this paper, we demonstrate ultrastable radio-frequency (RF) transfer over long-haul optical fiber link. Our stabilized RF transfer technique is based on high-performance dual phase locked loops (dual-PLL) configuration which improves signal to noi
Externí odkaz:
https://doaj.org/article/55bf552f82c34439ac2a05225deeefad