Fractional dynamical model to assess the efficacy of facemask to the community transmission of COVID-19

2022 ◽  
pp. 1-11
Author(s):  
Isa Abdullahi Baba ◽  
Musbahu Aminu Sani ◽  
Bashir Ahmad Nasidi
Keyword(s):  
Dynamical Model ◽  
Community Transmission

BUILDING A DYNAMIC MODEL OF A HELICOPTER POWER SUPPLY SYSTEM

2019 ◽  
Author(s):  
Dmitriy Krasnov ◽  
Vyacheslav Novoselsky
Keyword(s):  
Dynamic Model ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Dynamical Model ◽  
Matlab Simulink

This work is devoted to the analysis of the possibility of constructing a dynamical model of a helicopter power supply system in the MATLAB SIMULINK program.

Effective infection prevention and control strategies in a large accredited psychiatric facility in Singapore

2020 ◽  
Author(s):  
Daniel Poremski ◽  
Sandra Henrietta Subner ◽  
Grace Lam Fong Kin ◽  
Raveen Dev Ram Dev ◽  
Mok Yee Ming ◽  
...  
Keyword(s):  
Mental Health ◽  
Prevention And Control ◽  
Infection Prevention ◽  
Control Strategies ◽  
Infection Prevention And Control ◽  
Psychiatric Facility ◽  
Essential Services ◽  
Community Transmission ◽  
And Control

The Institute of Mental Health in Singapore continues to attempt to prevent the introduction of COVID-19, despite community transmission. Essential services are maintained and quarantine measures are currently unnecessary. To help similar organizations, strategies are listed along three themes: sustaining essential services, preventing infection, and managing human and consumable resources.

The Plausible role of Indian Traditional Medicine in combating Corona Virus (SARS-CoV 2): a mini-review

2020 ◽  
Vol 21 ◽  
Author(s):  
Adithya J ◽  
Bhagyalakshmi Nair ◽  
Aishwarya S ◽  
Lekshmi R. Nath
Keyword(s):  
Specific Treatment ◽  
Ocimum Sanctum ◽  
Drug Candidate ◽  
Asparagus Racemosus ◽  
Traditional System ◽  
Traditional Medicines ◽  
Contagious Nature ◽  
Community Transmission ◽  
Novel Virus

: SARS-CoV 2 is a novel virus strain of Coronavirus, reported in China in late December 2019. Its highly contagious nature in humans has prompted WHO to designate the ongoing pandemic as a Public Health Emergency of International Concern. At this moment, there is no specific treatment and the therapeutic strategies to deal with the infection are only supportive, and prevention aimed at reducing community transmission. A permanent solution for the pandemic, which has brought the world economy to the edge of collapse, is the need of the hour. This situation has brought intense research in traditional systems of medicine. Indian Traditional System, Ayurveda has a clear concept of the cause and treatment of pandemics. Through this review, information on the potential antiviral traditional medicines along with their immunomodulatory pathways is discussed. We have covered the seven most important Indian traditional plants with antiviral properties :Withaniasomnifera (L.) Dunal(family: Solanaceae),Tinosporacordifolia(Thunb.)Miers (family:Menispermaceae),Phyllanthusemblica L.(family:Euphorbiaceae),Asparagus racemosus L.(family:Liliaceae), Glycyrrhizaglabra L.(family:Fabaceae), Ocimum sanctum L.(family:Lamiaceae) and Azadirachta indica A.Juss(family:Meliaceae)in this review. An attempt is also made to bring into limelight the importance of dietary polyphenol, Quercetin which is a potential drug candidate in the making against the SARS-CoV2 virus.

scholarly journals Complexity and Chimera States in a Network of Fractional-Order Laser Systems

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 341
Author(s):  
Shaobo He ◽  
Hayder Natiq ◽  
Santo Banerjee ◽  
Kehui Sun
Keyword(s):  
Numerical Simulation ◽  
Numerical Solution ◽  
Bifurcation Diagram ◽  
Fractional Order ◽  
Dynamical Model ◽  
Chimera States ◽  
Laser Systems ◽  
Complexity Algorithm ◽  
Derivative Order

By applying the Adams-Bashforth-Moulton method (ABM), this paper explores the complexity and synchronization of a fractional-order laser dynamical model. The dynamics under the variance of derivative order q and parameters of the system have examined using the multiscale complexity algorithm and the bifurcation diagram. Numerical simulation outcomes demonstrate that the system generates chaos with the decreasing of q. Moreover, this paper designs the coupled fractional-order network of laser systems and subsequently obtains its numerical solution using ABM. These solutions have demonstrated chimera states of the proposed fractional-order laser network.

scholarly journals Computational Analysis of Ca2+ Oscillatory Bio-Signals: Two-Parameter Bifurcation Diagrams

Entropy ◽  
2021 ◽  
Vol 23 (7) ◽  
pp. 876
Author(s):  
Wieslaw Marszalek ◽  
Jan Sadecki ◽  
Maciej Walczak
Keyword(s):  
Equilibrium Points ◽  
Autonomous Systems ◽  
Cytosolic Calcium ◽  
Calcium Oscillations ◽  
Dynamical Model ◽  
Bifurcation Diagrams ◽  
Step Size ◽  
Oscillatory Systems ◽  
Two Parameter ◽  
Parameter Bifurcation

Two types of bifurcation diagrams of cytosolic calcium nonlinear oscillatory systems are presented in rectangular areas determined by two slowly varying parameters. Verification of the periodic dynamics in the two-parameter areas requires solving the underlying model a few hundred thousand or a few million times, depending on the assumed resolution of the desired diagrams (color bifurcation figures). One type of diagram shows period-n oscillations, that is, periodic oscillations having n maximum values in one period. The second type of diagram shows frequency distributions in the rectangular areas. Each of those types of diagrams gives different information regarding the analyzed autonomous systems and they complement each other. In some parts of the considered rectangular areas, the analyzed systems may exhibit non-periodic steady-state solutions, i.e., constant (equilibrium points), oscillatory chaotic or unstable solutions. The identification process distinguishes the later types from the former one (periodic). Our bifurcation diagrams complement other possible two-parameter diagrams one may create for the same autonomous systems, for example, the diagrams of Lyapunov exponents, Ls diagrams for mixed-mode oscillations or the 0–1 test for chaos and sample entropy diagrams. Computing our two-parameter bifurcation diagrams in practice and determining the areas of periodicity is based on using an appropriate numerical solver of the underlying mathematical model (system of differential equations) with an adaptive (or constant) step-size of integration, using parallel computations. The case presented in this paper is illustrated by the diagrams for an autonomous dynamical model for cytosolic calcium oscillations, an interesting nonlinear model with three dynamical variables, sixteen parameters and various nonlinear terms of polynomial and rational types. The identified frequency of oscillations may increase or decrease a few hundred times within the assumed range of parameters, which is a rather unusual property. Such a dynamical model of cytosolic calcium oscillations, with mitochondria included, is an important model in which control of the basic functions of cells is achieved through the Ca2+ signal regulation.

scholarly journals Structural Mapping of Mutations in Spike, RdRp and Orf3a Genes of SARS-CoV-2 in Influenza Like Illness (ILI) Patients

Viruses ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 136
Author(s):  
Bandar Alosaimi ◽  
Asif Naeem ◽  
Majed F. Alghoribi ◽  
Lilian Okdah ◽  
Maaweya E. Hamed ◽  
...  
Keyword(s):  
Surveillance Systems ◽  
Case Definitions ◽  
Structural Mapping ◽  
Policy Makers ◽  
Influenza Like Illness ◽  
Spike Gene ◽  
Ambulatory Patients ◽  
Community Transmission ◽  
Next Generation Sequencing Ngs ◽  
Epidemiological Link

In December 2019, the emergence of SARS-CoV-2 virus in China led to a pandemic. Since both Influenza Like Illness (ILI) and COVID-19 case definitions overlap, we re-investigated the ILI cases using PCR for the presence of SARS-CoV-2 in 739 nasopharyngeal swabs collected from November 2019 to March 2020. SARS-CoV-2 RNA was found in 37 samples (5%) collected mostly during February 2020. It was followed by confirmation of evolutionary and spatial relationships using next generation sequencing (NGS). We observed that the overall incidence of ILI cases during 2019–2020 influenza season was considerably higher than previous years and was gradually replaced with SARS-CoV-2, which indicated a silent transmission among ambulatory patients. Sequencing of representative isolates confirmed independent introductions and silent transmission earlier than previously thought. Evolutionary and spatial analyses revealed clustering in the GH clade, characterized by three amino acid substitutions in spike gene (D614G), RdRp (P323L) and NS3 (Q57H). P323L causes conformational change near nsp8 binding site that might affect virus replication and transcription. In conclusion, assessment of the community transmission among patients with mild COVID-19 illness, particularly those without epidemiological link for acquiring the virus, is of utmost importance to guide policy makers to optimize public health interventions. The detection of SARS-CoV-2 in ILI cases shows the importance of ILI surveillance systems and warrants its further strengthening to mitigate the ongoing transmission of SARS-CoV-2. The effect of NS3 substitutions on oligomerization or membrane channel function (intra- and extracellular) needs functional validation.

scholarly journals Genomics and epidemiology of the P.1 SARS-CoV-2 lineage in Manaus, Brazil

Science ◽  
2021 ◽  
pp. eabh2644 ◽  
Author(s):  
Nuno R. Faria ◽  
Thomas A. Mellan ◽  
Charles Whittaker ◽  
Ingra M. Claro ◽  
Darlan da S. Candido ◽  
...  
Keyword(s):  
Molecular Evolution ◽  
Genome Sequencing ◽  
Immune Evasion ◽  
Molecular Clock ◽  
Spike Protein ◽  
Dynamical Model ◽  
Mortality Data ◽  
Clock Analysis ◽  
Protection Against Infection ◽  
Molecular Clock Analysis

Cases of SARS-CoV-2 infection in Manaus, Brazil, resurged in late 2020, despite previously high levels of infection. Genome sequencing of viruses sampled in Manaus between November 2020 and January 2021 revealed the emergence and circulation of a novel SARS-CoV-2 variant of concern. Lineage P.1, acquired 17 mutations, including a trio in the spike protein (K417T, E484K and N501Y) associated with increased binding to the human ACE2 receptor. Molecular clock analysis shows that P.1 emergence occurred around mid-November 2020 and was preceded by a period of faster molecular evolution. Using a two-category dynamical model that integrates genomic and mortality data, we estimate that P.1 may be 1.7–2.4-fold more transmissible, and that previous (non-P.1) infection provides 54–79% of the protection against infection with P.1 that it provides against non-P.1 lineages. Enhanced global genomic surveillance of variants of concern, which may exhibit increased transmissibility and/or immune evasion, is critical to accelerate pandemic responsiveness.

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