bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stagnation-Point Flow and Heat Transfer Over an Exponentially Stretching/Shrinking Sheet in Hybrid Nanofluid with Slip Velocity Effect: Stability Analysis
Authors: Anuar N S , Bachok N , Arifin N M , Rosali H , Pop I 
Published: November 2019

Abstract
The effect of slip on stagnation point flow and heat transfer over an exponentially stretching/shrinking sheet filled with Copper-Alumina/water nanofluids is investigated numerically in this paper. The governing boundary layer equations are transformed into a set of ordinary differential equations using a similarity transformation and then solved numerically using the bvp4c function in Matlab. The effects of nanoparticle volume fraction, slip parameter and stretching/shrinking parameter on the flow pattern and heat transfer have been studied. It is found that dual solutions exist for hybrid nanofluid in the case of shrinking sheet. Furthermore, slip parameter and Copper nanoparticle acts in widening the range of solution. Hybrid nanofluids have the higher heat transfer rate compared to nanofluid and viscous fluid. A stability analysis showed that the first solution is linearly stable and physically realizable.
Malaysia’s 14th General Election via Twitter: An analysis using the epidemiological model
Authors: Noor N S M , Akil K A K , Shafie L A 
Published: November 2019

Abstract
Twitter has been prominently used during the electoral campaigns. Twitter helps the politicians to spread and share their political agenda. Through Twitter, every information is accessible to anyone and anybody around the world in keeping up with the latest information like a manifesto and others that relate to political issues. However, the popularity of political parties and leaders that could raise the winning opportunities in the election is not fully understood. This study aims to analyse the spreading of information during Malaysia’s 14th General Election via Twitter. This study employed an epidemiological model which is a system of differential equations known as Susceptible-Infected-Recovered (SIR). The model involves three state variables, which are active Twitter users (S), the transmission node (I) and immune Twitter users (R). The Twitter accounts owned by two political parties and two political leaders have been followed before and after the election. The influence of contact rate between active Twitter users and the transmission node of Twitter users on Malaysia’s 14th General Election was analysed. The results showed that the contact rate between active Twitter users and the transmission node of the Twitter users has a significant influence on Malaysia’s 14th General Election.
Natural convection flow of Sodium Alginate based Casson nanofluid about a solid sphere in the presence of a magnetic field with constant surface heat flux
Authors: Alwawi Firas A , Alkasasbeh Hamzeh T , Rashad Ahmad M , Idris Ruwaidiah 
Published: November 2019

Abstract
In this paper, we examined a free convection flow of Sodium Alginate (SA) as a host Casson fluid with three different types of nanoparticles specifically, Silicon Dioxide (SiO2), Copper oxide (CuO), and Copper (Cu) on a solid sphere in the presence of magnetic field along with prescribed surface heat flux. The Keller-box method was carried out for solving the transformed governing partial differential equations. Numerical results for the local skin friction coefficient are obtained and compared with literature. Also, the influences of Casson parameter, magnetic parameter, nanoparticles volume fraction, on local skin friction coefficient, local Nusselt number, temperature, and velocity are analyzed graphically. Our study revealed that the local Nusselt number, local skin friction coefficient and velocity profiles of SiO2 - SA based Casson nanofluid are higher than the other nanoparticles - SA based Casson nanofluid, as well as it has the lowest temperature profiles.
Pseudospecteral method with linear damping effect and de-aliasing technique in solving nonlinear PDEs
Authors: Alias Azwani , Nik Ismail Nik Nur Amiza , Harun Fatimah Noor 
Published: November 2019

Abstract
Pseudospectral method is an alternative of finite differences and finite elements method to solve nonlinear partial differential equations (PDEs), especially in nonlinear waves. The Pseudospectal method is very efficient because it use the fast fourier transform to calculate discrete Fourier transform in the algorithm. In this paper, the Pseudospectral scheme is modified by adding the linear damping effect and de-aliasing technique, and has been tested in Ostrovsky equation, where Ostrovsky equation is a modified of Korteweg-de Vries equation with an addition of background Earth’s rotation. The addition of the linear damping is to prevent the possibility of radiated waves re-entering from the boundaries and disturbing the main wave structure. Most of the numerical simulations occur with the aliasing errors due to pollution of numerically calculated Fourier transform by higher frequencies component because of the truncation of the series. To prevent this, the de-aliasing technique is implemented on the nonlinear term and linear damping region by setting of the amplitudes to be zero at the end of both boundaries. Therefore, the simulation results of Pseudospectral method will be smooth without any high frequency errors even for the high amplitude of the waves from initial condition.
MHD stagnation point flow towards a quadratically stretching/shrinking surface
Authors: Nasir N.A.A.M. , Ishak A. , Pop I. , Zainuddin N. 
Published: November 2019

Abstract
A quadratically stretching/shrinking surface of two dimensional magnetohydrodynamics stagnation point flow is investigated numerically. The velocity of the surface is assumed in quadratic form and subject to a linear mass flux. The influences of the governing parameters namely stretching/shrinking parameter ⋋, suction/injection parameter S, fluid temperature index m, and magnetic parameter M on the flow and thermal fields are studied. The model of nonlinear ordinary differential equations is obtained by reducing the partial differential equations of the boundary layer using an suitable similarity transformation. The equations are then solved numerically by boundary value problem solver, bvp4c built in MATLAB software. The numerical results are verified by comparing them with previously reported results. The characteristics of the flow and heat transfer characteristics are shown graphically and analyzed for distinct values of the governing parameters. It is found that both magnetic and temperature index parameters reduce the velocity flow while the magnetic parameter enhances the heat transfer rate. There exist dual solutions for certain range of ⋋. A stability analysis is performed to determine which of these solutions are stable and which are not.
MHD Stagnation Point Flow of Micropolar Nanofluid with Soret and Dufour Effects
Authors: Binti Zulkifli Siti Norfatihah , Sarif Norhafizah Md , Salleh Mohd Zuki , Azmi Ezzatul Farhain 
Published: November 2019

Abstract
The effect of Soret and Dufour on magnetohydrodynamic (MHD) stagnation point flow of a micropolar nanofluid over a horizontal stretching sheet is considered. A boundary condition that assumed nanoparticle flux at the plate to be zero is applied in this study. The governing equations are in partial differential equations therefore a similarity transformation variable is employed to reduce the governing non-linear partial differential equations into non-dimensional ordinary differential equations. The ordinary differential equations are computed numerically using Runge-Kutta-Fehlberg (RKF45). Validation of the result is made by comparing the present results with the previous studies. Numerical results are presented in the graphical form for temperature and concentration profile to provide a better insight of this study. It is found that, temperature profile and nanoparticle volume fraction profile increase with an increasing values of Soret and Dufour effects.
The Lefkovitch Matrix of Aedes Aegypti with Rainfall Dependent Model for Eggs Hatching
Authors: Tokachil M N , Yahya A 
Published: November 2019

Abstract
Dengue is known as borne disease that was spread by a species of mosquito which is Aedes aegypti. This disease is considered as a dangerous disease since it can threat human life. Shah Alam city has the high reported dengue cases in Malaysia. Based on this situation, this research was done in order to simulate the population of the mosquito in the city which involved in dengue transmission. A stage-structured of the mosquito life cycle was interpreted into Lefkovitch matrix model which consist of possible rate relating to the mosquito life cycle. The egg hatching rate was set as the main factor which influence the number of mosquito population and it depends on water availability due to rainfall. In this research, the temperature was set as constant because the temperature in Malaysia does not show any significant different compared to the rainfall distribution. The validation of the result was made by doing comparison between the simulations of eggs number with the amount of rainfall in order to see the relationship of the trends for both variables. As a result, the dynamic of dengue cases might be possible related to the trend of rainfall which provide breeding site for the female mosquito to lay eggs which contribute to the increase in the number of mosquito population. However, for the further studies, the researcher should consider other factor such as humidity since it might influence the mosquito life cycle and thus can give more accurate results.
Hybrid nanofluid flow and heat transfer past a permeable stretching/shrinking surface with a convective boundary condition
Authors: Waini I , Ishak A , Pop I 
Published: November 2019

Abstract
The steady flow and heat transfer past a permeable stretching/shrinking surface in a hybrid nanofluid with a convective boundary condition is studied. The governing equations of the problem are transformed to the similarity equations by using similarity transformation technique. The problem is solved numerically using the boundary value problem solver (bvp4c) in Matlab software. The plots of the skin friction coefficient and the local Nusselt number as well as the velocity and temperature profiles for selected parameters are presented. Results show that dual solutions exist for a certain range of the stretching/shrinking and suction parameters. The critical values of these parameters decrease with the increasing of the copper (Cu) nanoparticle volume fractions. It is found that the heat transfer rate for hybrid nanofluid is higher than that for nanofluid for the impermeable stretching surface. It is also found that the increasing of the copper (Cu) nanoparticle volume fractions enhances the skin friction coefficient and reduces the local Nusselt number for the shrinking surface. The rise in Biot number leads to the increment of the temperature at the surface and widen the thermal boundary layer for both branches. A temporal stability analysis is performed to determine the stability of the dual solutions in a long run, and it is revealed that only one of them is stable while the other is unstable.
Rayleigh–Bénard convection in rotating nanofluids layer with feedback control subjected to magnetic field
Authors: Khalid Izzati Khalidah , Mohd Mokhtar Nor Fadzillah , Ibrahim Zarina Bibi 
Published: November 2019

Abstract
Magnetic field on Rayleigh–Bénard convective instability in rotating feedback–controlled nanofluids layer heated from below has been examined for the boundaries of free–free, rigid–free and rigid–rigid. Model applied to nanofluids associated with the Brownic movement and thermophoresis mechanism. A normal–mode linear stability assessment has been performed, the eigenvalue solution has been extracted by using single term Galerkin technique and computed by employing Maple software. It is found that the influences of magnetic field, feedback control, rotation are to slow down the thermal instability.
Effect of magnetohydrodynamic Casson fluid flow and heat transfer past a stretching surface in porous medium with slip condition
Authors: Wahid N S , Arifin N M , Turkyilmazoglu M , Rahmin N A A , Hafidzuddin M E H 
Published: November 2019

Abstract
In this paper, we investigate the flow of magnetohydrodynamic Casson fluid over a linear stretching surface in porous medium with slip condition. The governing partial differential equations are reduced to non-linear ordinary differential equations with the aid of similarity transformation. The transformed equations and boundary conditions are then solved by using exact analytical method. The flow field is affected by the presence of physical parameters, such as Casson fluid parameter, magnetohydrodynamic parameter, velocity slip parameter, porosity parameter, and suction/injection, whereas the temperature field is additionally affected by magnetohydrodynamic, thermal radiation, Prandtl and Eckert numbers. The effects of the pertinent physical parameters on the velocity and temperature fields are presented through graphs and discussed. Skin friction and heat transfer coefficients are tabulated and analyzed.
Equilibrium Isotherm Models for the Adsorption of Methylene Blue from Wastewater
Authors: Othman M S , Sheikh Hussin S A , Rambli A , Zahid Z 
Published: November 2019

Abstract
This research evaluates the equilibrium isotherm models for the adsorption of Methylene Blue (MB) from wastewater by using sawdust red wood and beech wood. The sawdust acts as the low-cost adsorbent by using agriculture by product in order to treat the wastewaters. The objectives for this study are two folds. Firstly, to choose the significant factors (parameters) for the adsorption process. The factors applied in this study are mass of the adsorbent, concentration of the MB solution, pH of the MB solution and contact time between adsorbent and adsorbate. Secondly to determine the best isotherm model on the adsorption process of MB by sawdust. The isotherm models used in this research are Langmuir, Freundlich, Dubinin-Radushkevich and Temkin. Results show that concentration of MB solution is the one and only significant factor for the adsorption process to occur using red wood. Mass of adsorbate, concentration of MB solution and pH of MB solution are the significant factors for the adsorption process to occur using beech wood. The result for the second objective shows that Freundlich is the best model that describe the adsorption process of beech wood as for MB by red wood, Temkin is the best model.
LINTAS-LC 1.0: Modeling and Simulation of Traffic in Lingkar Cileunyi Bandung Indonesia
Authors: Harahap E , Darmawan D , Badruzzaman FH 
Published: November 2019

Abstract
Smooth traffic is one of the parameters of the government’s good performance in managing the transportation system. The smoothness of traffic plays an important role in improving community development which covers the fields of economy, social, culture, education and technology. Along with the increase in population, traffic becomes more congested and occurs in various places. This situation will reduce the level of productivity, economy, social and welfare of the community, while increasing air pollution and waste of fuel. One of the congested locations that make concern is the path of Cileunyi road, which is located in the Cibiru sub-district and Cileunyi district bordering Bandung City and the Regency, Indonesia. The traffic congestion occurs starting from the starting point of Cinunuk road to the end by length 2.9 Km. The Cinunuk road is the only non-highway road that connects traffic in the northern region the south and east region. This resulted in a high volume of vehicles going through the route, so that traffic congestions occur every day from 6am to 11pm, and it’s getting worst on the day before weekend or holiday. An alternative solution that is relatively appropriate, effective, and efficient to solve the congestion problem is to build an alternative route known as the circle lane of cileunyi (lingkar cileunyi - LC). This route is a new road that planned by government through a different area with the Cinunuk road for the purpose of breaking down the traffic congestion. In this article, we propose a traffic simulation system to preview the traffic situation on the Cinunuk and the LC road, which is named as “LINTAS-LC 1.0”. The simulator is intended to analyse and simulate the level of congestion that occurs in the Cinunuk road, and make a feasibility study on the discourse on the development of the LC road. Through the LINTAS-LC simulator, it is expected to predict the effectiveness of LC road development in describing congestion in the Cinunuk road. The LINTAS-LC simulator is compiled using the SimEvents-MATLAB toolbox on the basis of Mathematics, specifically the queuing theory.
G-Jitter Induced Natural Convection Nanofluid Flow with Mass Transfer in The Stagnation Point Region of a Three Dimensional Body
Authors: Ahmad Kamal Mohamad Hidayad , Rawi Noraihan Afiqah , Ali Anati , Shafie Sharidan 
Published: November 2019

Abstract
The laminar flow near a stagnation point at the boundary layer is studied numerically in this paper. Viscous nanofluid with copper nanoparticles is considered in microgravity environment. The problem is described in term of mathematical formulation and the nanofluid studies is focusing on the volume fraction of the nanoparticles. After going through Boundary Layer and Boussinesq approximations, the dimensional governing equation is then transformed into dimensionless governing equation by using semi-similar transformation technique together with its initial and boundary conditions. In a way to solve the coupled dimensionless equations, implicit finite different method known as Keller-box methid is used in studying the transportation phenomena in terms of physical quantities of physical interest which are skin frictions that describe the flow behaviour, Nusset number represent the heat transfer coefficient and Sherwood number that refer to concentration distribution. It is found that stagnation point parameter which is curvature ratio, provide a different type of nanofluid flow cases. On the other hand, with the presence of g jitter which correspond to the microgravity environment, the parameter frequency of oscillation effects the convergence of the problem which the convergence occurs more frequently with bigger frequency. The enhancement of thermal conductivity is found by comparing the result of conventional fluid with nanofluid.
Approximate Solutions of Some Linear Boundary Value Problems Using the Homotopy Analysis Method Combined with Sumudu Transform
Authors: Nemrat Asem AL , Hailat Ibrahim , Zainuddin Zarita 
Published: November 2019

Abstract
This paper considers a combined form of the Sumudu transform with the modified homotopy analysis method (MHAM) to find approximate and analytical solutions for linear two-point boundary value problems. This method is called the modified Sumudu transform homotopy analysis method (MSTHAM). The suggested technique relies on the freedom of the homotopy analysis method (HAM) by introducing an appropriate initial approximation and furthermore, the residual error will be canceled in some points of the interval (RECP). Only a first order approximation of MSTHAM will be required, as compared to STHAM, which needs more iterations for the same cases of study. The proposed method has been applied to solve two examples and the results have been compared with those obtained by the standard STHAM and the exact solutions, where it is found that the proposed solutions are of high accuracy and, therefore, MSTHAM is extremely efficient, simple and can be applied to other types of problems.
Mathematical modelling of wave overtopping at vertical structures
Authors: Abdul Ghani Fadhlyya Arawaney , Ramli Mohd Shahridwan , Md Noar Nor Aida Zuraimi , Mohd Kasim Abdul Rahman 
Published: November 2019

Abstract
Considering the threats of wave overtopping that can cause flooding in the coastal area and hence implying various damages to the inland properties, this paper provides a simplified mathematical modelling of wave overtopping calculation at vertical seawall as proposed by Cooker. Taking the assumption that the water jet particles projected against the seawall move as free projectiles, a simple estimation is made from the computation of the water displacement which can pass over top of the wall of finite height by applying the trapezoidal rule to the equations derived from both energy conservation and the pressure impulse, P previously proposed by Cooker. The results indicate that the overtopping volume per wave is exponentially decaying with the height of the wall above the still water level and is in good agreement to previous researcher and is used to estimate the overtopping discharge for berm and ditch structures. Both cases are comparable for corresponding freeboard values which concluded that the water jet onto the seawall with berm structure will reach higher in the air compared to that of with ditch.
Sensitivity Analysis in a Dengue Fever Transmission Model: A fractional order system approach
Authors: Hamdan N I , Kilicman A 
Published: November 2019

Abstract
The main purpose of the study of dengue fever transmission is to be able to determine the best approach to reduce human mortality and morbidity caused by the disease. Therefore, it is essential to identify the relative importance of the different factors that contribute to disease transmission and prevalence. Here, a fractional order epidemiological model describing the dengue fever transmission is presented, as well as the basic reproduction number, denoted by R
0. The initial disease transmission is highly significant with the basic reproduction number, R
0. Thus, the needs for conducting an analysis that tells us how sensitive the threshold quantity of R
0 is, with respect to its parameters, is very crucial. The sensitivity analysis is performed to calculate the sensitivity indices of the reproduction number R
0, that measures the disease transmission and the endemic equilibrium point, that measures disease prevalence to the parameters model. It has been shown that for the reproduction number, the most sensitive parameters are the mortality rate of the adult mosquito and the mosquito biting rate. However, the equilibrium proportion of infected humans is very sensitive to the transition rate from the immature vector stage to the adult stage, and human recovery rate. These suggest that dengue control policies that target the vector population and recovery rate of individuals can be a great resolution in controlling dengue.
Nonlinear partial differential equations model related to ethanol production
Authors: Fakhruddin Azimi Ahmad Izul , Jamil Norazaliza Mohd 
Published: November 2019

Abstract
The study presents a mathematical model of an ethanol production system via fermentation. This model was extended from the established model to examine mass transfer and the inhibition effects on microbial such as yeasts or bacteria, sugar as its substrate and ethanol for the product. In this study, two types of laboratory-scale fermentation are considered, i.e. shaker fermentation and shaker-free fermentation. This led to studying the coupled diffusionreaction and coupled diffusion-reaction-advection models from a previous mathematical model which describes mass transfer. A better understanding of those model able to predict the behaviour of mass transfer effect on fermentation scenarios. The effect of the diffusion coefficient and the advection coefficient are investigated to simulate the dynamical behaviour of the system. Since the model is nonlinear partial differential equations (PDEs), Gear’s algorithm, a numerical method was employed to solve the system while the Nelder–Mead method is utilised to estimate the value of the parameters. The result shows that the diffusion does not have a huge impact on the whole ethanol production system but is contrary to advection. In order to affect the ethanol production system, only tiny advection value is needed, however, a big diffusion value is necessary to achieve the same effect.