Results 91 to 100 of about 9,973,806 (349)

Improving Microgrid Frequency Regulation Based on the Virtual Inertia Concept while Considering Communication System Delay

Energies, 2019
Frequency stability is an important issue for the operation of islanded microgrids. Since the upstream grid does not support the islanded microgrids, the power control and frequency regulation encounter serious problems.
Gholam Ali Alizadeh, Tohid Rahimi, Mohsen Hasan Babayi Nozadian, Sanjeevikumar Padmanaban, Zbigniew Leonowicz   +4 more
doaj   +1 more source

Joint Timekeeping of Navigation Satellite Constellation with Inter-Satellite Links

Sensors, 2020
As a system of ranging and positioning based on time transfer, the timekeeping ability of a navigation satellite constellation is a key factor for accurate positioning and timing services. As the timekeeping performances depend on the frequency stability
Leyuan Sun, Wende Huang, Shuaihe Gao, Wei Li, Xiye Guo, Jun Yang   +5 more
doaj   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

Comparative Analysis of Current Control Techniques to Support Virtual Inertia Applications

Applied Sciences, 2018
The rapid transition towards an inverter-dominated power system has reduced the inertial response capability of modern power systems. As a solution, inverters are equipped with control strategies, which can emulate inertia by exchanging power with the ...
Ujjwol Tamrakar, Dipesh Shrestha, Naresh Malla, Zhen Ni, Timothy M. Hansen, Indraman Tamrakar, Reinaldo Tonkoski   +6 more
doaj   +1 more source

Atomic frequency standards for ultra-high-frequency stability [PDF]

The general features of the Hg-199(+) trapped-ion frequency standard are outlined and compared to other atomic frequency standards, especially the hydrogen maser.
Dick, G. J., Maleki, L., Prestage, J. D.
core   +1 more source

Performance of a prototype atomic clock based on lin||lin coherent population trapping resonances in Rb atomic vapor

, 2009
We report on the performance of the first table-top prototype atomic clock based on coherent population trapping (CPT) resonances with parallel linearly polarized optical fields (lin||lin configuration).
Belcher, Ben-Aroya, Breschi, Cyr, Erhard, Eugeniy E. Mikhailov, Fleischhauer, Griffith, Irina Novikova, Jau, Jau, Kazakov, Knappe, Knappe, Knappe, Knappe, Kominis, Kornack, Ledbetter, Merimaa, Mikhailov, Nathan Belcher, Novikova, Novikova, Phillips, Shah, Shah, Taichenachev, Taichenachev, Taichenachev, Travis Horrom, Vanier, Vanier, Xiao, Xiao, Yashchuk, Zanon, Zibrov, Zibrov   +38 more
core   +1 more source

Liquid Hydroxyurea (Xromi) for Children With Sickle Cell Anemia: A New Solution Compounding Existing Problems

Pediatric Blood &Cancer, EarlyView.
Alexandra Power‐Hays, Charles T. Quinn
wiley   +1 more source

An intracellular transporter mitigates the CO2‐induced decline in iron content in Arabidopsis shoots

FEBS Letters, EarlyView.
This study identifies a gene encoding a transmembrane protein, MIC, which contributes to the reduction of shoot Fe content observed in plants under elevated CO2. MIC is a putative Fe transporter localized to the Golgi and endosomal compartments. Its post‐translational regulation in roots may represent a potential target for improving plant nutrition ...
Timothy Mozzanino, Meijie Li, Cécile Fizames, Mattia Adamo, Laurence Lejay, Christian Dubos, Matthieu Platre, Antoine Martin   +7 more
wiley   +1 more source

Analysis of the Phase Noise for Frequency Controlled Cryogenic Sapphire Oscillators

IEEE Access
Cryogenic sapphire oscillators (CSO) typically require frequency stabilization and noise reduction servos to achieve ultra-high frequency stability and ultra-low phase noise.
Encai Zhong, J.-M. Le Floch, Hongli Liu, Ke Deng, Jie Zhang, Zehuang Lu   +5 more
doaj   +1 more source

DSS 13 frequency stability tests [PDF]

In a previous article, the results of frequency stability tests at DSS 13 were presented in table form for tau = 1000 s for the test period May 1985 through March 1986. This article is a continuation of that initial report and presents specially selected
Franco, M. M., Otoshi, T. Y.
core   +1 more source