This paper aims to explore the optimal control of the novel pandemic COVID-19 using non-clinical approach. We formulate a mathematical model to analyze the transmission of the infection through different human compartments. By applying a sensitivity test, we obtain the sensitivity indexes of the parameters involved in the transmission of the disease. We demonstrate the most active/sensitive parameters

The higher dimensional Fokas equation is the integrable expansion of the Kadomtsev-Petviashvili (KP) and Davey-Stewartson (DS) equations. The Fokas model has an important role in wave theory, to describe the physical phenomena of waves on the surface and inside the water. This article deals with the (4+1)-dimensional conformable space-time fractional-order Fokas partial differential equation. Two efficient

The safety of national traditional sports equipment is one of the basic conditions for the development of national traditional sports. Based on this, a fault detection technology of national traditional sports equipment based on optical microscope imaging technology is proposed. The concept of confocal fluorescence is integrated into the imaging system of an optical microscope to improve the axial

A novel passive frequency beam-steering linear antenna array is proposed in this paper to be utilized at the transmit side of a long-range wireless power transfer (WPT) system. To assure high power handling for a long-range transfer, the proposed antenna is designed based on stripline technology. Moreover, unlike other reported designs, the antenna array in this paper uses parallel feed while frequency

The novel coronavirus (COVID-19) could be described as the greatest human challenge of the 21st century. The development and transmission of the disease have increased mortality in all countries. Therefore, a rapid diagnosis of COVID-19 is necessary to treat and control the disease. In this paper, a new method for the automatic identification of pneumonia (including COVID-19) is presented using a proposed

The aim of this paper is to evaluate the potential improvement of classification results in the frame of discrete proportional fractional operator. The nonlocal kernel of the generalized proportional fractional sum depending on ĥ-discrete exponential functions defined on time scale ĥZ. This paper deals novel discrete versions of the Pólya-Szegö and ČebyšeV type inequalities via discrete ĥ-proportional

This paper contributes to develop a highly accurate numerical method for solving two-dimensional mass transfer equations during convective air drying of apple slices. The numerical scheme is based on the interpolating the solution of the mentioned equations over the roots of the orthogonal Jacobi polynomials (i.e., the Jacobi-Gauss-Lobatto points) in a nodal form. Moreover, for speeding up the procedure

In this study, a novel stochastic computational frameworks based on fractional Meyer wavelet artificial neural network (FMW-ANN) is designed for nonlinear-singular fractional Lane-Emden (NS-FLE) differential equation. The modeling strength of FMW-ANN is used to transformed the differential NS-FLE system to difference equations and approximate theory is implemented in mean squared error sense to develop

Fast and precise propagation of satellite orbits is required for mission design, orbit determination and payload data analysis. We present a method to improve the computational performance of numerical propagators and simultaneously maintain the accuracy level required by any particular application. This is achieved by determining the positional accuracy needed and the corresponding acceptable error

Through extenics-based case reasoning, this research puts forward a method to configure the modules of complex machine products. Firstly, the knowledge on the process of product design was represented, and the convergence modes of design plans were analyzed, with the aid of product semantics and the knowledge representation model of the primitives. Next, the semantic correlation function was constructed

To evaluate the effects and interactions of these factors in CIN in a Chinese cohort. A total of 180 participants, including 61 normal cervix (NC), 59 CIN-I, and 60 CIN-II/III women were enrolled. We measured the serum folate, expressions of hnRNP E2, HPV16 L1, and L2 protein. The levels of serum folate in CIN-I and CIN-II/III groups were lower than the NC group. The expression of hnRNP E2 in the CIN-Ⅱ/Ⅲ

Herein, laminar convective heat transfer from two horizontally arranged spheres has been evaluated by using numerical models inside water-based fluids incorporated with alumina (Al2O3), copper oxide (CuO), and copper (Cu) nanoparticles. The problem was simulated for different Rayleigh numbers ranging from 103 to 106 and various volume fractions including 2, 4, 6, and 8%. The evaluation process included

This study consider the development of three dimensional analytical solutions for contaminant transport induced by a pumping well near a stream. The solutions were derived for both line-width and finite-width streams based on Green’s function approach. These solutions were implemented in an aquifer that was partially penetrated by the stream and were general enough to be applied to both unconfined

To bibliometrically analyze karst-related studies from 1990 to 2016. We collected data, and our findings revealed that the number of documents, authors, research institutes, participant countries, and English references dominant increased for karst-related studies. While geology, water resources, and ecology were leading categories of karst-related studies, environmental earth science karst-related

In this paper we like to explore the full power of Adomian decomposition method (ADM), specially its symbolic capability. We will demonstrate the standard ADM and ADM with integration factor to compute explicit closed form solutions of first order scalar partial differential equations with unprescribed initial conditions, and even with parameters. These features are those numerical methods fail to

Undeniably, the Novel Coronavirus 2019, (COVID-19), has disrupted the routine functioning of the global economic and social activities. In particular, vulnerable economies such as the Small Island Developing states (SIDs) are facing unprecedented health and financial crisis. In such critical situation, some in-depth statistical models can be helpful for proper planning in terms of identifying factors

The unprecedented Covid-19 pandemic has resulted in more than 14.75 million infections and 6, 10, 839 deaths in 212 countries. Appropriate interventions can decrease the rate of Covid-19 related mortality. Fast track clinical trials around the world are addressing the efficacy of individual pharmaceutical agent acting at various stages of pathogenesis. However, lessons learnt while dealing with past

The paper investigates Calogero-Degasperis-Fokas (CDF) equation, an exactly solvable third order nonlinear evolution equation (Fokas, 1980). All possible functions for the unknown function F(ν) in the considered equation are listed that contains the nontrivial Lie point symmetries. Furthermore, nonlinear self-adjointness is considered and for the physical parameter A≠0 the equation is proved not strictly

In a managerial position, the ultimate objective is to take the right decision for the decision maker (DM) when transportation parameters are uncertain due to the globalization and other uncontrollable influences. In this paper, fuzzy membership function tactic based on goal programming to obtain the desired compromise solution of a multi-objective transportation problem (MOTP) in uncertain environment

Hurghada city is a region in Egypt that has suitable potential for supplying energy by hybrid renewable sources. A combination of four different hybrid renewable sources of solar photovoltaics (SPV), wind turbines, diesel engines, and storage batteries is considered for residential systems. The simulation results, optimization, and modeling procedures are completed with the use of HOMER software. From

It is stated in the present study that extreme learning machines (ELM) will display a greater performance in solar radiation estimation compared to artificial neural networks (ANN). The data acquired from Karaman province during 2010–2018 were used for evaluating the performance of the suggested approach. It was put forth when results were compared that ELM has displayed a greater estimation performance

A simple arrangement of wheel-shaped copper microstrip antenna is presented for operation in the 24 GHz frequency band. In this structure, a coaxial feed probe was utilized to generate vertical polarization, and a wheel-shaped microstrip with four coupling arms was used to produce horizontal polarization. An antenna comprising of two copper sheets assembled between the air-substrate was manufactured

Data hiding technique using steganography prospered widely due to its high un-detectability, flexibility to the size of hidden data, and robustness against compression and other image processes. Accordingly, this paper aims to use a steganographic technique based on DICOM medical images, where one medical image is used as a cover image, and the other one is used as the secret message image. This method

This paper deals with the solution of system of 2D-fuzzy Fredholm integral equations (2D-FFIEs) depend upon the parametric form fuzzy number; using an efficient algorithm called Optimal Homotopy Asymptotic Method (OHAM). The efficiency and effectiveness of the proposed technique is tested upon some numerical example and the results are compared with modified homotopy perturbation method, 2D triangular

This paper presents an extensive fault analysis for DC microgrids based on accurate representation of DC microgrid components. The DC microgrid incorporates photovoltaic system and wind energy system as renewable energy sources, batteries as energy storage devices, and constant power loads as a typical loading profile in DC systems. As a practical issue, all renewable energy sources are controlled

This paper presents a new hybrid algorithm of Harris hawks’ optimization with sequential quadratic programming (HHO-SQP) for optimal coordination of directional overcurrent relays to find optimal relays settings. The SQP procedure is employed in the hybrid algorism as a local search mechanism to enhance the performance of the original HHO method. The optimization problem is described based on a developed

This paper presents the parametric study for the flow characteristic and heat transmission of MHD TiO2-water nanofluid (NF) in a permeable channel with expanding or contracting walls with thermal radiation. The slip condition is imposed on the lower wall of the channel. The Tiwari-Das (TD) NF model is used to study the properties of the nanoparticles (NPs) considering water as base fluid (BF). Similarity

The behavior of Cattaneo-Hristov heat diffusion moving in a line segment under the influence of specified initial and source temperatures has been investigated. The Fourier method has been applied to determine the eigenfunctions thus allowing reducing the problem to a set of time-fractional ordinary differential equations. Analytical solutions by applying the Laplace transform method have been developed

This paper presents a new strategy for robotic manipulator inverse kinematics, which senses the final position error of the end-effector through an observational error model based on an Internet Protocol (IP) camera and calculates the joint variable errors through two fuzzy control techniques. Single Stage Fuzzy Controller (SSFC) and Three Stages Fuzzy Controller (TSFC) served as an inverse kinematic

In the process of wood surface processing, it is easy to cause safety accident. Therefore, it is very necessary to find a new and clean processing method instead. In this paper, the laser automatic processing method is used instead of manual work, exploring the ablation of milled wood surfaces with nanosecond pulse laser. Four commonly used kinds of wood were selected, and milled separately in three

This study aims to raise awareness of renewable energies' importance from an economic and environmental perspective and provide reference data for the investment decision in Tunisia's renewable energy. It focuses on the techno-economic analysis of a grid-connected photovoltaic-wind power system to supply residential load in 26 cities in Tunisia using the multi-year module. Three types of small wind

For obtaining numerical solutions of the system of ordinary differential equations (ODEs) of third order, a new numerical technique is proposed by using operational matrices of Bernstein polynomials. These operational matrices can be utilized to solve different problems of integral and differential equations. The System of third-order ODEs occur in various physical and engineering models. In this paper

Due to strict regulations on harmful emissions such as NOx and CO, many novel combustion techniques have been investigated in order to decrease emissions from gas turbines. One of these novel techniques is colorless distributed combustion (CDC) or flameless combustion (FC). CDC has been examined under reacting conditions using ANSYS Fluent at 27 different operating cases for the aim of developing design

The paper introduces a step-up multiple-input multi-stage dc-dc converter with a soft-switching for Photovoltaic (PV) applications. The proposed topology is constructed from series connection of switched capacitor circuits to minimize the effects of partial shading and mismatch between PV modules. A soft switching is achieved for the entire switches in the converter with no need for additional components

This study used heat-activated carbon (350 °C in the air) for the adsorption and removal of furfural from wastewater. The characteristics of air oxidation activated carbon (ACAOx) were tested. The results indicated that oxygen-containing functional groups were generated, with 1306 m2/g BET surface area of ACAOx. Salt concentration, temperature, and initial pH slightly affected the adsorption of furfural

A mathematical model for the transmission of buruli ulcer disease is proposed in this paper, incorporating three control strategies. Using the stability theory of differential equations, optimal control, and computer simulation, a nonlinear mathematical model for the problem is developed and qualitatively analyzed. Buruli ulcer free equilibrium and buruli ulcer present equilibrium were established

Consider a lessor (service provider) offering a multi-period lease contract (LC) for remanufactured products. The LC proposed has two attributes –i.e. mperiods, m⩾1 and a usage threshold (a limitation of usage allowed). If the total usage of the product is below the usage threshold during the LC periods, then no extra charge is required. Otherwise the lessee needs to pay some extra charge. The lessor

Earth wall reinforced with geogrids (a type of Mechanically Stabilizes Earth wall) are used widely nowadays in varies geotechnical applications. However, applications of reinforced earth are still very limited in marine works such as harbor structure (quay walls) or coastal protection (sea walls). This paper presents numerical investigation to evaluate the behavior of reinforced earth retaining walls

A 1:15 3/4 open-jet scaled wind tunnel was used for experimental test. By arranging the synthetic jet actuator around the nozzle, the experimental method was used to analyze the flow field after the active flow control was implemented. The effects of the excitation frequency fJ of different input signals and the excitation velocity V0 of different jet nozzles on the jet shear layer and the flow field

In house CFD code, FVHT has been used to solve the dimensionless form of the governing equations of heat transfer utilizing a hybrid TDMA method within a high-order finite volume approach. Enclosures with different aspect ratios (0.25 to 8) have been studied with different heat generation rates (6 to 14) in dimensionless form. The enclosures were in natural convection heat transfer mode filled with

In the design of flow geometries consisting of channels such as high-temperature gas heat exchangers, a great number of design parameters can be chosen, why solving the turbulent Reynolds Averaged Navier-Stokes (RANS) equations by CFD coupled with other physics can become computational demanding. Therefore, we here propose a method for a significant reduction of computational resources and consequent

In this work, a novel ZnS/chitosan composite was fabricated as an effective catalyst for the photodegradation of Acid Brown 5G and Acid Black 2BNG carcinogenic azo dyes in the presence of ultraviolet irradiations. The as-fabricated ZnS/chitosan composite was investigated using different spectroscopic tools such as FT-IR, XRD, UV–Vis, HR-TEM, and FE-SEM. The successful synthesis of the ZnS/chitosan

The reduction of the Nile River Nile flow to Egypt is expected due to the construction and potential improper filling of various projects in the Nile River basin such as the Grand Ethiopian Renaissance Dam (GERD). Therefore, this research investigates the potential impacts of the GERD on the groundwater level in the Nile Valley aquifer in El-Minia Governorate. Three filling scenarios of 2, 3 and 6 years

In the present study, an improved adaptive neuro fuzzy inference system (ANFIS) and multilayer perceptron (MLP) models are hybridized with a sunflower optimization (SO) algorithm and are introduced for lake water level simulation. The Urmia Lake water level is predicted and assessed using the potential of the proposed advanced artificial intelligence (AI) models. The sunflower optimization algorithm

Electrical discharge turning (EDT) process is finding its application in machining of rotary elements that is usually difficult to be machined with conventional processes. In order to perform the process more efficient, in the present work a new modification through assistance of magnetic field with EDT process was adopted. Here, an experimental study was made to investigate effect of magnetic field

Bimetallic nanoparticle formation by applying pulsed laser ablation on the gold (Au) - titanium (TiO2) film was demonstrated. Experiments were conducted at room temperature. Au and TiO2 nanoparticles were mixed in different ratios and deposited as the starting material on silicon wafer plates, which were dried and placed in a beaker with distilled water. After a pulsed laser beam was applied, the collected

Effects of electrolyte solution (i.e., KOH, NaOH, NaCl, and HCl) with various concentrations (from 0 to 0.71 M) on corrosion and mechanical properties of the copper alloys were investigated. Experimental results showed that the increases in the concentration of electrolytes allowed faster corrosion process. However, too high concentration of electrolytes has no further impacts on the corrosion profile

This paper deals with the photothermal interaction of an isotropic, homogenous, semiconducting, viscothermoelastic solid cylinder in the context of Lord-Shulman's of generalized thermoelasticity theory. The cylinder rotates around its axis with constant angular velocity. The bounding surface of the cylinder has been thermally shocked. The governing equations have been constructed in the Laplace transform

Nowadays, microgrids play a significant role in the development of modern distribution networks (DNs). In this context, the ever increasing presence of renewable distributed generation (DG) in microgrids has imposed new challenges in protection coordination, rendering traditional coordination schemes inefficient. Thus, it is essential to explore new approaches for protection coordination that take

“Wash hands frequently, reduce aggregation, and wear masks” is an important measure for the prevention and control of the new crown pneumonia epidemic. Rail transit is the basic means of transportation to ensure the daily travel of citizens. Carriages and stations are both densely populated places. Reducing the density of carriages and platforms is an urgent problem for rail transit operations in the

A numerical simulation of a two-dimensional Eyring-Powell nanofluid flow is carried out through a Riga plate with radiative walls. Simultaneous contributions of chemical reaction and activation energy have also been taken into account on the mixed convection flow. Lubrication effects are applied by considering second order slip boundary condition in order to reduce the role of skin friction. A set

Focusing on the selection of green and low carbon (GLC) innovation, this paper builds an evolutionary game between manufacturing enterprises, and another model between an enterprise and the government. Based on the models, the dynamic evolution of the selection process was analyzed in details. The results show that the game between manufacturing enterprises will eventually converge, due to the cost

Drawing on complex network theory, this paper combines bus network and subway network into a multi-subnet composited complex network (MSCCN) of urban public transport (UPT). Then, the cascading failure of the MSCCN nodes and edges was modelled, and the passenger flow transfer rules were established under node and edge failures. Considering the impact of extreme weather on the UPT, a synthetic operator

Given a finite group G and a positive integer r, an r-coloring of G is any mapping χ:G→{1,…,r}. Colorings χ and φ are equivalent if there exists g∈G such that χ(xg-1)=φ(x) for all x∈G. A coloring χ is symmetric if there exists g∈G such that χ(gx-1g)=χ(x) for every x∈G. We compute the number of symmetric r-colorings and the number of equivalence classes of symmetric r-colorings of an elementary Abelian

A mathematical model of the Green-Naghdi photo-thermoelastic model due to ramp-type heating is presented to study the photo- thermo-elastic waves in a two-dimension semi-conductor material. By using Fourier and Laplace transforms with the eigenvalue scheme, the variables are analytically obtained. A semiconductor media such as silicon is investigated. Numerical outcomes for all the physical quantities

This paper presents dynamic model of COVID-19 and citizens reaction from a fraction of the population in Nigeria using fractional derivative. We consider the reported cases from February to June 2020 using fractional derivative. The Stability analysis of the model was carried out and the basic reproduction number was calculated via the next generation matrix. The fractional derivative model was solved

This paper presents a modified Neutron Computerized Tomography reconstruction method for solving three main problems facing the Inverse Radon Transform based reconstruction method. The three problems are poor contrast of the reconstructed slice, the duplication of slice and the error in the center of rotation position in the images. The paper aims to solve all of these problems automatically without

Recent years have witnessed the growing popularity of deep eutectic solvents (DESs) in the extraction of functional components. As a novel green alternative to organic reagents, DESs are environmentally friendly, non-toxic, inexpensive, and biodegradable. In the present study, tailor-made DESs were prepared and applied for the first time to extract flavonoids from rhizomes of Polygonatum odoratum.

To solve the problems of small area, slow calculation speed and low precision in the projection transformation algorithm of raster data, the idea of using Kriging interpolation approximate grid algorithm for raster data projection transformation is proposed. Through the experimental results of point-to-point transformation and Kriging interpolation approximate grid algorithm transformation under the

Accurate monitoring of air quality is of great importance to our daily life. By predicting the air quality in advance, we can make timely warnings and defenses to minimize the threat to life. With a large number of environmental data, the air quality prediction based on deep learning technology is studied in depth. Based on long short-term memory (LSTM), a comprehensive prediction model with multi-output