Features of a CPT-based atomic clock with pumping by different-order sidebands of a VCSEL's frequency

2019 ◽  
Author(s):  
Daba Radnatarov ◽  
Sergey M. Kobtsev ◽  
Valerii Andryushkov ◽  
Sergey Khripunov
Keyword(s):  
Atomic Clock ◽  
Different Order

A Next-Generation, Miniaturized Rb Atomic Clock Reference for Mobile, GNSS-Denied Environments

2020 ◽  
Author(s):  
William Krzewick ◽  
Jamie Mitchell ◽  
John Bollettiero ◽  
Peter Cash ◽  
Kevin Wellwood ◽  
...  
Keyword(s):  
Atomic Clock ◽  
Next Generation

Magnetic shield integration for a chip-scale atomic clock

2020 ◽  
Vol 13 (10) ◽  
pp. 106504
Author(s):  
Hyun-Gue Hong ◽  
Jongcheol Park ◽  
Tae Hyun Kim ◽  
Hee Yeoun Kim ◽  
Sang Eon Park ◽  
...  
Keyword(s):  
Atomic Clock ◽  
Magnetic Shield

scholarly journals Fractional SIR-Model for Estimating Transmission Dynamics of COVID-19 in India

J ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 86-100
Author(s):  
Nita H. Shah ◽  
Ankush H. Suthar ◽  
Ekta N. Jayswal ◽  
Ankit Sikarwar
Keyword(s):  
Basic Reproduction Number ◽  
Reproduction Number ◽  
Transmission Rate ◽  
Sir Model ◽  
Time Dependent ◽  
Contact Rate ◽  
Distribution Maps ◽  
Fundamental Parameters ◽  
Different Order ◽  
The Basic Reproduction Number

In this article, a time-dependent susceptible-infected-recovered (SIR) model is constructed to investigate the transmission rate of COVID-19 in various regions of India. The model included the fundamental parameters on which the transmission rate of the infection is dependent, like the population density, contact rate, recovery rate, and intensity of the infection in the respective region. Looking at the great diversity in different geographic locations in India, we determined to calculate the basic reproduction number for all Indian districts based on the COVID-19 data till 7 July 2020. By preparing district-wise spatial distribution maps with the help of ArcGIS 10.2, the model was employed to show the effect of complete lockdown on the transmission rate of the COVID-19 infection in Indian districts. Moreover, with the model's transformation to the fractional ordered dynamical system, we found that the nature of the proposed SIR model is different for the different order of the systems. The sensitivity analysis of the basic reproduction number is done graphically which forecasts the change in the transmission rate of COVID-19 infection with change in different parameters. In the numerical simulation section, oscillations and variations in the model compartments are shown for two different situations, with and without lockdown.

scholarly journals Time-Domain Analysis of Fractional Electrical Circuit Containing Two Ladder Elements

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 475
Author(s):  
Ewa Piotrowska ◽  
Krzysztof Rogowski
Keyword(s):  
Fractional Derivative ◽  
Fractional Derivatives ◽  
Electric Circuit ◽  
Theoretical Models ◽  
Time Domain Analysis ◽  
Electrical Circuit ◽  
State Variable ◽  
State Space System ◽  
Derivatives Of ◽  
Different Order

The paper is devoted to the theoretical and experimental analysis of an electric circuit consisting of two elements that are described by fractional derivatives of different orders. These elements are designed and performed as RC ladders with properly selected values of resistances and capacitances. Different orders of differentiation lead to the state-space system model, in which each state variable has a different order of fractional derivative. Solutions for such models are presented for three cases of derivative operators: Classical (first-order differentiation), Caputo definition, and Conformable Fractional Derivative (CFD). Using theoretical models, the step responses of the fractional electrical circuit were computed and compared with the measurements of a real electrical system.

scholarly journals Berry-phase gates for fast and robust control of atomic clock states

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Yunheung Song ◽  
Jongseok Lim ◽  
Jaewook Ahn
Keyword(s):  
Robust Control ◽  
Berry Phase ◽  
Atomic Clock

Simulation of servo loops in Atomic Clock Ensemble in Space (ACES)

2010 ◽  
Author(s):  
J. K. Dam ◽  
W. Schafer ◽  
G. Hejc ◽  
M. P. Hess ◽  
L. Stringhetti ◽  
...  
Keyword(s):  
Atomic Clock
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