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Sir - DOAJ

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Last Updated: 20 September 2022

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A Study of SiR/EPDM Mixtures for Outdoor Insulators

This paper discusses the flashover voltages on samples of silicone rubber/ethylene propylene monomer mixtures under the influence of a uniform electric field.

Source link: https://doi.org/10.48084/etasr.1251


A Numerical and Analytical Study of a Stochastic Epidemic SIR Model in the Light of White Noise

This review examines a new SIR epidemic model that takes into account the effects of environmental white noise. According to the report, white noise has a significant effect on the disease. We'll go into detail later, but we'll explain that the stochastic basic production R0 is a determining factor that determines disease persistence or persistence.

Source link: https://doi.org/10.1155/2022/1638571


New Results and Open Questions for SIR-PH Epidemic Models with Linear Birth Rate, Loss of Immunity, Vaccination, and Disease and Vaccination Fatalities

Our paper introduces three new classes of models: SIR-PH, SIR-PH-FA, and SIR-PH-IA, along with state two problems we would like to solve about them. The deterministic mathematical epidemiology's central rule, as shown by R 0 alternative R 0 u201d of Van den Driessche and Watmough, states that the local stability condition of the disease-free environment can be expressed as R 0 0, where R 0 is the common basic reproduction number that also plays a key role in the theory of branching processes. When R 0 > 1, there exists a specific fixed endemic point, but 2. The local endemic point is relatively stable when R 0 > 1. One would like to establish these properties for a large group of realistic epidemic models. U201csimple U201d but a large number of u201c-PH modelsu201d with varying populations have been introduced recently, with the express intention of establishing these processes the two properties listed above. We have introduced a new class of u201c-PH-FAUD models, which may be interpreted as approximations for the SIR-PH models and include simpler models typically used in the literature, since that seemed to be too difficult, we have released a new series of u201c-PH-FAu201d models, which may be interpreted as approximations for the SIR-PH models. The goal of our paper is to bring attention to the two open problems identified above for the SIR-PH and SIR-PH-FA, as well as a second, more sophisticated u201cintermediate approximation (u201d SIR-PH-IA). We illustrate the present status quo by a new study that focuses on a generalization of the SAIRS epidemic model.

Source link: https://doi.org/10.3390/sym14050995


On a SIR Model in a Patchy Environment Under Constant and Feedback Decentralized Controls with Asymmetric Parameterizations

All the set of health centers in the United States studied believe that the vaccination controls are administered at each community health center of a particular patch, although either the complete or partial subpopulations, including the interchanging ones, are distributed by all the concerned health centers. In the case where not all of the details of the subpopulations distributions at other patches of each patch are known by the health center of each patch, the feedback vaccination policy would have a decentralized structure. If the reproduction number is constant, such a point coincides with the disease-free equilibrium point. According to the requirements of the disease reproduction number's ensuring both the unattainability and stability of the endemic equilibrium point, the longevity and stability of the disease-free equilibrium point are ensured.

Source link: https://doi.org/10.3390/sym11030430


Experimental Study and Modeling of the Effect of ESDD/NSDD on AC Flashover of SiR Outdoor Insulators

When soluble and nonsoluble materials coat the surface of an insulator, a decrease in its performance can result in a decrease in the product's efficiency. The common form of sodium chloride was used as a soluble pollutant and kaolin as a nonsoluble pollutant in this paper. For this research and fabrication at Cardiff University's Advanced High Voltage Engineering Research Centre, sample rubber insulators were chosen and fabricated. In addition, the AC voltage ramp method was used to achieve flashover voltage with various pollution levels. Using FOV electrical equations and experimental results, the aim of this study was to investigate the effect of nonsoluble materials on flashover characteristics in order to determine their interaction with dry-band arcs. Both ESDD and NSDD values increased with the increase in both ESDD and NSDD values. The test results reveal that the FOV voltage of the silicone rubber insulator dramatically decreased with the increase in both ESDD and NSDD values has significantly reduced.

Source link: https://doi.org/10.3390/en15103782


Miniaturized Bandpass Filter Using a Combination of T–Shaped Folded SIR Short Loaded Stubs

In modern life, the consumption of multimedia media is ubiquitous. Bandpass filters have become very popular, as they solve certain data transmission issues that have been hindering users of getting consistent access to their multimedia content. These BPFs are bulky, and they will perform with quarter-u2013wavelength short stubs. We introduce a compact BPF with a Tu2013-shaped stepped impedance transmission line and a folded SIR system in this article. The current BPF uses a T-shaped SIR connected to a JU2013inverter system; this T-shaped SIR unit is used to replace the u03bb g /4 transmission line seen in conventional stub BPFs. In addition, a folded SIR is attached to the short stubs seen in traditional stub BPFs. The new BPF's total length is 2. 44 mm u00d7 1. 49 mm. Due to its planar shape, the new BPF can be mass produced using semiconductors.

Source link: https://doi.org/10.3390/s22072708


SARS-COV-2: SIR Model Limitations and Predictive Constraints

Methods: The study found severe acute respiratory syndrome coronavirus 2 outbreak and dissemination patterns were calculated by reworking time series data extraction of daily new cases in terms of deviation consistency concerning variables that support COVID-19 transmission. Results: The key research findings are the elucidation of three birth- and death-forced seasonality persistence phases that can be used to explain COVID-19 skew patterns worldwide. Conclusions: Three forced seasonality phases were outlined in the predictive SIR model equations as a theoretical framework for explaining uncertainty that might differ between the disease's behaviour and the disease's behavior.

Source link: https://doi.org/10.3390/sym13040676


Computational Intelligent Paradigms to Solve the Nonlinear SIR System for Spreading Infection and Treatment Using Levenberg–Marquardt Backpropagation

Six different instances of SIR models are presented with the ready-built LMB neural network, providing the answers to both the categories of spreading disease and its treatment. With the Adam numerical system for each case of the spreading disease and its treatment, a reference database of the designed LMB neural network is established. Using the LMB, approximate results of the SIR system based on the spreading disease and its cure are presented in the education, authentication, and testing procedures to adapt the neural network by lowering the mean square error function.

Source link: https://doi.org/10.3390/sym13040618


Novel Method to Analytically Obtain the Asymptotic Stable Equilibria States of Extended SIR-Type Epidemiological Models

Based on the Markov chain technique, we describe a new analytical technique to determine the asymptotic stable equilibria states.

Source link: https://doi.org/10.3390/sym13071120

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions