Distributed time delay sensing in a random fiber grating array based on chirped pulse φ-OTDR

2020 ◽  
Vol 45 (13) ◽  
pp. 3423 ◽  
Author(s):  
Yuan Wang ◽  
Ping Lu ◽  
Stephen Mihailov ◽  
Liang Chen ◽  
Xiaoyi Bao
Keyword(s):  
Time Delay ◽  
Fiber Grating ◽  
Chirped Pulse ◽  
Distributed Time Delay ◽  
Grating Array

Loading condition estimation using long-period fiber grating array

2020 ◽  
pp. 1-1
Author(s):  
Felipe Oliveira Barino ◽  
Renato Faraco-Filho ◽  
Deivid Campos ◽  
Vinicius N. H. Silva ◽  
Andres P. Lopez-Barbero ◽  
...  
Keyword(s):  
Loading Condition ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Condition Estimation ◽  
Grating Array ◽  
Period Fiber Grating

Wideband true-time-delay beam former that employs a tunable chirped fiber grating prism

2003 ◽  
Vol 42 (13) ◽  
pp. 2273 ◽  
Author(s):  
Yunqi Liu ◽  
Jianping Yao ◽  
Jianliang Yang
Keyword(s):  
Time Delay ◽  
Fiber Grating ◽  
True Time Delay ◽  
True Time ◽  
Chirped Fiber Grating

Comparison of two different types of fractional-order COVID-19 distributed time-delay models with real data application

2021 ◽  
pp. 2150219
Author(s):  
Liangli Yang ◽  
Yongmei Su ◽  
Xinjian Zhuo
Keyword(s):  
Time Delay ◽  
Fractional Order ◽  
Distributed Delay ◽  
Real Data ◽  
Least Square ◽  
Order Model ◽  
The Real ◽  
Fractional Order Model ◽  
Different Types ◽  
Distributed Time Delay

The outbreak of COVID-19 has a great impact on the world. Considering that there are different infection delays among different populations, which can be expressed as distributed delay, and the distributed time-delay is rarely used in fractional-order model to simulate the real data, here we establish two different types of fractional order (Caputo and Caputo–Fabrizio) COVID-19 models with distributed time-delay. Parameters are estimated by the least-square method according to the report data of China and other 12 countries. The results of Caputo and Caputo–Fabrizio model with distributed time-delay and without delay, the integer-order model with distributed delay are compared. These show that the fractional-order model can be better in fitting the real data. Moreover, Caputo order is better in short-term time fitting, Caputo–Fabrizio order is better in long-term fitting and prediction. Finally, the influence of several parameters is simulated in Caputo order model, which further verifies the importance of taking strict quarantine measures and paying close attention to the incubation period population.

scholarly journals Minimal Wave Speed in a Predator-Prey System with Distributed Time Delay

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Fuzhen Wu ◽  
Dongfeng Li
Keyword(s):  
Time Delay ◽  
Traveling Wave ◽  
Wave Speed ◽  
Upper And Lower Solutions ◽  
Traveling Wave Solutions ◽  
Predator Prey ◽  
Wave Solutions ◽  
Prey System ◽  
Minimal Wave Speed ◽  
Distributed Time Delay

This paper is concerned with the minimal wave speed of traveling wave solutions in a predator-prey system with distributed time delay, which does not satisfy comparison principle due to delayed intraspecific terms. By constructing upper and lower solutions, we obtain the existence of traveling wave solutions when the wave speed is the minimal wave speed. Our results complete the known conclusions and show the precisely asymptotic behavior of traveling wave solutions.

scholarly journals Complicated dynamics of tumor-immune system interaction model with distributed time delay

2020 ◽  
Vol 25 (7) ◽  
pp. 2391-2406
Author(s):  
Min Yu ◽  
◽  
Gang Huang ◽  
Yueping Dong ◽  
Yasuhiro Takeuchi ◽  
...  
Keyword(s):  
Immune System ◽  
Time Delay ◽  
Interaction Model ◽  
Distributed Time Delay

scholarly journals Overlapping Decentralized Controller Design for Descriptor-type Systems with Distributed Time-delay

2021 ◽  
Vol 20 ◽  
pp. 257-263
Author(s):  
Altug Iftar
Keyword(s):  
Time Delay ◽  
Large Scale ◽  
Controller Design ◽  
Original System ◽  
Type Systems ◽  
Large Scale System ◽  
Decentralized Controllers ◽  
Distributed Time Delay

Decentralized controller design using overlapping decompositions is considered for descriptor-type systems with distributed time-delay. The approach is based on the principle of extension. In this approach, a given large-scale system is decomposed overlappingly into a number of subsystems and expanded such that the overlapping parts appear as disjoint. A decentralized controller is then designed for the expanded system. This controller is then contracted for implementation on the original system. It is shown that if the decentralized controllers are designed to stabilize the expanded system and to achieve certain performance, then the contracted controller, which would have an overlapping decentralized structure, will stabilize the original system and will achieve corresponding performance

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