bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis Ag nanoparticle by laser fragmentation for high sensitive ammonia residue detection
Authors: Zahrah A N , Herbani Y , Tahir D 
Published: November 2019

Abstract
We have been synthesis silver nanoparticles by using chemical analysis and successfully reduce silver nanoparticles by femtosecond laser fragmentation method with various silver nanoparticles size ranges from 60 - 75 nm, 10 - 35 nm and 9-17 nm. Characterization is carried out by Modular UV-Vis Spectrometer (MayaPro200, Ocean Optics) and Transmission Electron Microscope (TEM FEI Tecnai G20 S-Twin 200kV). Based on the results, silver nanoparticles (particles size are 9-17 nm) is high potential for detection of ammonia residues by ammonia PPM enhancement (10 PPM, 100 PPM, 150 PPM, 200 PPM, 250 PPM, 300 PPM, 350 PPM, 400 PPM, 450 PPM, and 500 PPM) and a maximum shift of absorbance at a wavelength of 433.39 nm, while TEM characterization have the structure is round.
Fabrication and characterization starch/chitosan reinforced polypropylene as biodegradable
Authors: Jangong O S , Gareso P L , Mutmainna I , Tahir D 
Published: November 2019

Abstract
The production of bioplastic from starch/chitosan reinforced polypropylene with different ratio from 35/65, 50/50 and 65/35. In present study, bioplastic was investigated by using tensile strength test, X-Ray diffraction (XRD), and Fourier transform infra-red (FTIR) spectroscopy, and respectively. XRD analysis shows that the sample have amorphous phase structure with the main broad peaks 18° to 30°. FT-IR used to investigate functional group and the result analysis show that the main bonding is of O-H hydrogen bonds (carboxylic acid), C-H alkanes, C=C alkenes and C-O alcohols. The tensile strength obtained for bioplastic were 68.41Mpa at ratio 65/35, respectively. These bio plastics have exhibited mechanical properties with high biodegradability that makes them a suitable alternative for the existing conventional plastics.
Evaluation of Typical Dose Rate Values, Maximum Dose Rate in Air and Dose Rate in Surface Image Intensifier (Ii) in Dual Function Fluoroscopy (Fl)
Authors: Bariah K , Dewang S , Suryani S 
Published: November 2019

Abstract
This study aims to determine the value of the typical dose rate, the maximum dose rate in the air and the dose rate on the surface of Image Intensifier (II) in 3 types of dual function Fluoroscopy (FL). This study used a dual function Fluoroscopy, X-Ray safe multimeter, Pb plate, Cu plate, and phantom perspek. Typical dose rate measurement were carried out by placing a multimeter X-Ray of phanrom perspek of a thickness of 18 cm, so that the examination table distance from the detector was 18 cm and source distance from image of 96 cm according to normal patient position. Measuring the maximum dose rate in teh air is done by placing the detector at distance of 300 mm above the examination table, placing the Pb 2 mm below the collimator, the exposure is carried out at the maximum automatic kVp. Measuring the dose rate of the surface Image Intensifier (II) is done by placing the detector above II, the Cu plate with a thickness of 2 mmCu is affixed to the surface of the collimator and the exposure is carried out on the automatic kVp. Typical dose rated to test results from FL (A) and FL (C) with the same size II are 35 cm while FL (B) sized II is 23 cm. The results of the tipical dose rate test for FL (A), FL (B), and FL (C) are 11.428 mGy/minute, 11.712 mGy/minute and 12.518 mGy/minute, respectively. All results of the testing of the typical ESD dose rate are still within the test passes which are ⩽17 mGy/minute as required by BAPETAN Regulation No. 2 in 2018. The value of the maximum dose rate in air of each planes is very varied from the maximum value on FL (B) is 11.402 mGy/minutes, while the minimum value occur to FL (C) is 4.311 mGy/minutes. As for FL (A), the maximum dose rate in air is 7.998 mGy/minutes. All results of testing the maximum dose rate in air are still below the test pass value required by BAPETAN which is 50 mGy/minutes. The value of the dose rate of surface II varies greatly from FL (B) having a maximum value is 68.2 µGy/m inutes while FL (A) and FL (C) are 33.3 µGy/minutes and 2.4 µGy/minutes, resvectively. All results of testing the dose rate of the surface of Image Intensifier (II) are still below the test pass value required by BAPETAN which is 60 µGy/minute for size II 23 cm and 90 µGy/minute for size II ⩾ 23 cm.
Sensitivity Enhancement of Strain Sensor Based on Polymer Optical Fiber for Concrete Testing
Authors: Arifin A , Samsu A , Yunus M , Abdullah B , Tahir D 
Published: November 2019

Abstract
Research has been carried out about sensitivity enhancement of strain sensor based on polymer optical fiber used for concrete testing. Strain sensor testing was done by applying of pressure to the concrete using the Ultimate Testing Machine (UTM). Strain sensor was made from polymer optical fiber without coat with straight, U and rectangular configurations. At both ends of the sensor connected with Light Emitting Diode (LED), phototransistor and amplifier circuit that produces output value in the form of analog voltage that is converted by the Arduino Uno microcontroller into the digital voltage value displayed on the computer. The results showed that the greater the load given on the concrete, the greater the strain on the sensor, so that the output voltage read on the computer gets smaller. The best sensitivity value obtained at rectangular configuration with 3 cm amplitude is 0.117 V/cm with 0.008 cm resolution. Strain sensor in the concrete structures testing based on polymer optical fiber has advantages including low cost, simple measurement system, easy fabrication with high sensitivity.?
Three Decades State of the Tombolo Related to Wind Climate (1985 to 2015): Case of Galesong Beach, Takalar Regency
Authors: Pada B T , Suriamihardja D A , Sakka  , Paharuddin  , Assegaf M A H 
Published: November 2019

Abstract
Tombolo-shaped beach in Galesong District orientated westward is a nice morphology behind the detached Sanrobengi Island in front of mainland of Takalar Regency. Our main interest is formulated as the problem of how the tombolo whether is experiencing continual growth or retreated. This study aims to explain changes of shape and its area of the tombolo morphology for each five-year period along the shoreline based on the influence of wind directions. This study uses Google Earth Pro Image from 1985 to 2015 to map key changes of the shoreline, where the obtained data are analysed using ArcGIS 10.3. Wind data is obtained from the European Centre Medium-Term Weather Forecast (ECMWF) from 1985 to 2015 where the wind data is analysed using Ocean Data View, and WRPlot 5.3 is used to form wind rose diagrams. Shoreline of the tombolo is divided into six segments and studied into five-year periods from 1985 to 2015. The obtained results showed that the wind direction is enough to influence the change of shorelines in the area of the Tombolo. From 1985 to 2015, the dominant wind direction is from the West and Northwest. Overall changes are as follow, the area of tombolo is developed during the period of 1985 to 1995; while the area of tombolo is retreated in the period of 1995 to 2015.
Modeling of Extreme Rainfall Recurrence Using Conditional Probability Approach
Authors: Sunusi N 
Published: November 2019

Abstract
Forecasts for the occurrence of extreme rainfall are related to time lapse estimates until the next extreme rain event. The accuracy of these estimates depends on the choice of interevent time distributions of extreme rain events. The aim of this research is to estimate the probability of time recurrence of extreme rainfall. In this research, we observed the time between extreme rain events distributed by Weibull and Pareto. Let T be the time interval for the next extreme rain and it is assumed that there has been no extreme rain at time interval (0, t
0]. To analyze the occurrence of the next extreme rain event, the concept of conditional probability P(Δt
0|t
0) is used. P(Δt
0|t
0) is the probability of extreme rain occurrence during the time interval Δt
0. The results show that by using three models, we found that the next extreme rain event is not depending on the time interval Δt
0 since the last extreme rain event. Other results show that for case studies of extremerain events in South Sulawesi it was found that the time of occurrence of extreme rainfall was influenced by parameter value for each model.
Prediction of currency crisis in Indonesia using combined volatility and Markov regime switching models based on lending interest rate / deposit interest rate indicator
Authors: Sugiyanto  , Zukhronah E , Slamet I 
Published: November 2019

Abstract
In mid of 1997, a currency crisis had a severe impact on the economy in Indonesia. Based on this situation, it is necessary to build an early warning system to anticipate the crisis events. The crisis occurred due to some macro-economic indicators fluctuated very high and the change of regime. Combined volatility and Markov regime switching models suited to explain the crisis. In this article it was used indicator of lending interest rate / deposit interest rate from 1990 to 2018. The results showed that MRS-GARCH (3,1,1) model can explain the crisis. Based on this model, it can be predicted that in 2019 there was no sign of a currency crisis in Indonesia.
Numerical Study of Mixed Convection Heat Transfer in Methanol based Micropolar Nanofluid about a Horizontal Circular Cylinder
Authors: Swalmeh M Z , Alkasasbeh H T , Hussanan A , Mamat M 
Published: November 2019

Abstract
In this article, the mixed convection boundary layer flow about a horizontal circular cylinder with a micropolar nanofluid, which is maintained at a constant surface heat flux, has been investigated. Three types of nanoparticles with distinct conductivities, namely, graphene oxide, copper and copper oxide are considered and suspended in methanol based micropolar nanofluid. The governing equations are transformed into nonlinear PDEs by applying the similarity transformations and then solved numerically by an implicit finite difference scheme known as Keller-box method. The results for the local wall temperature, local skin friction coefficient, temperature, velocity and angular velocity are plotted and discussed for different parameters such as nanoparticles volume fraction and mixed convection parameter in view of thermo-physical properties of nanoparticles and base fluid. Moreover, numerical results for the local wall temperature and local skin friction coefficient are obtained. It is found that copper (Cu) suspended methanol based micropolar nanofluid have higher velocity than the copper oxide (CuO) or graphene oxide (GO) methanol based micropolar nanofluid. Comparison have been made with published results on Newtonian fluid under special cases and obtained in close agreement.
Williamson nanofluid flow over a stretching sheet with varied wall thickness and slip effects
Authors: Razi Shazwani Md , Soid Siti Khuzaimah , Abd Aziz Ahmad Sukri , Adli Noorashikin , Ali Zaileha Md 
Published: November 2019

Abstract
This study investigates the effects of slip parameters and velocity power index parameter along with wall thickness on the magnetohydrodynamic (MHD) boundary layer flow of a Williamson nanofluid through a stretching sheet in porous medium. The governing partial differential equations are transformed into nonlinear ordinary differential equations (ODEs) using the relevant similarity variables. These nonlinear ODEs are solved numerically using the Runge-Kutta Fehlberg in MAPLE software. The effects of the pertinent parameters on the velocity, temperature and nanoparticle volume fraction profiles are presented graphically. The impact of the physical parameters on the skin friction coefficient, the local Nusselt number and the local Sherwood number are computed and analyzed. The velocity profile increases when the velocity slip parameter increases. The temperature slip and nanoparticle fraction slip parameters reduce the temperature and the nanoparticle volume fraction profiles respectively. The temperature and the nanoparticle volume fraction profiles significantly increase due to the increase in the velocity power index. An opposite behaviour is observed on different values of the wall thickness parameter when the power index is less than one compared to greater than one.
MHD boundary layer flow over a permeable flat plate in a ferrofluid with thermal radiation effect
Authors: Anuar Mohamed Muhammad Khairul , Abas Farah Nadia , Salleh Mohd Zuki 
Published: November 2019

Abstract
Adaptation from the thermal management with limited gravitational acceleration and excesses of radiation such as in aerospace, present study investigated the magnetohydrodynamic (MHD) boundary layer flow and heat transfer of ferrofluid past a permeable flat plate with thermal radiation effects. The mathematical model which is in non-linear partial differential equations are transformed to a more convenient form by similarity transformation approach before being solved numerically using the Runge-Kutta-Fehlberg (RKF45) method in MAPLE software. The characteristics and effects of pertinent parameters which are Prandtl number, magnetic parameter, thermal radiation parameter and the permeability parameter on the variation of Nusselt number and skin friction coefficient are analyzed and discussed. Three selected ferroparticles which are magnetite (Fe3O4), cobalt ferrite (CoFe2O4) and Mn-Zn ferrite (Mn-Zn Fe2O4) with water-based fluid are examined numerically.
Mathematical Modeling of Cancer Growth Process: A Review
Authors: Tabassum Shabana , Rosli Norhayati Binti , Binti Mazalan Mazma Sayahidatul Ayuni 
Published: November 2019

Abstract
Although cancer is a leading cause of death, a little is known about the mechanism of its growth and destruction. Mathematical models explaining these mechanisms are crucial to predict the behaviour of cancer cells proliferation. Perusal of the literature dealing with mathematical modelling of cancer initiation, proliferation and metastases is abundant. Mathematical models to simulate the growth rate of the cancer cells have been derived from both deterministic and stochastic considerations. Early model of tumor growth by diffusion was first introduced and then set the scene for many later mathematical models for solid tumors. In this article we review the deterministic and stochastic models that have been developing to discuss the tumor growth initiation and proliferation. The findings and interpretations are summarized, and the main research issues are highlighted.
Reflection and transmission coefficients from the superposition of various potentials
Authors: Boonserm P , Ngampitipan T , Sansuk K 
Published: November 2019

Abstract
The reflection and transmission coefficients describe the behavior of the matter wave incident on a potential barrier. They can be expressed in terms of the probability with which the matter wave can be reflected or transmitted. The central equation accounting for the behavior of the matter wave is the Schrödinger equation. The Schrödinger equation is the second order partial differential equation. However, in a stationary state, the Schrödinger equation is reduced to the time independent Schrödinger equation. This time independent Schrödinger equation is the second order linear ordinary differential equation. Since the time independent Schrödinger equation is linear, superposition of any of the two solutions to the time independent Schrödinger equation is also a solution. In this paper, we focus on the superposition of various potentials. The reflection and transmission coefficients from the superposition of various potentials are obtained. A comparison between the exact coefficients and those obtained by the 2 × 2 transfer matrix is made. The relationship between the transmission coefficient of the superposed potential and that of each individual potential is found. The results show that the transmission coefficient obtained from the 2 × 2 transfer matrix is of a lower bound on the exact transmission coefficient.
Non-uniqueness of solutions to a MHD stagnation-point flow over an exponentially permeable stretching/shrinking sheet with velocity slip
Authors: Jamaludin A , Nazar R , Pop I 
Published: November 2019

Abstract
In this study, a magnetohydrodynamic (MHD) stagnation-point boundary layer flow over an exponentially stretching/shrinking sheet with suction/injection and velocity slip effects is presented. The governing equations were first transformed into a non-linear ordinary differential equations with the help of similarity transformations. Following from there, the equations obtained were solved numerically utilizing the bvp4c programme in MATLAB. It was determined that the non-linear ordinary differential equations possessed non-uniqueness of solutions (dual solutions). Stability analysis was performed to verify the stability of the dual solutions obtained. The results revealed that the first solution was stable while the second solution was unstable. Apart from that, it was also found that as the magnetic, suction and velocity slip parameters increased, the range of the non-uniqueness of solutions increased correspondingly. Hence, it is proposed that the existence of magnetic, suction and velocity slip effects delayed the boundary layer separation.
Flow and heat transfer of MHD non-Newtonian power-law fluids due to rotating disk
Authors: Rosli N D K , Kechil S A 
Published: November 2019

Abstract
In flows over rotating disk, substantial additional flow phenomena arise due to the rotational forces or due to the nature of the three-dimensional boundary layer flows. The resulting flow characteristics can be very complex and almost every rotating system reveals novel and unexpected flow characteristics over a sufficiently wide range of variables which affect the hydrodynamic phenomena. This paper focuses on the flow and heat transfer in non-Newtonian power law fluids due to a rotating disk in the presence of magnetic field. The number of independent variables in the highly non-linear partial differential equations was reduced by suitable similarity transformations. The coupled non-linear ordinary differential equations were solved numerically using the finite difference collocation method of MATLAB bvp4c. The effects of the magnetic parameter and Prandtl number on the flow fields and heat transfer rate were investigated for the cases of shear thinning and shear thickening power law fluids. The heat transfer rate reduces as the magnetic field strength increases but increases as the Prandtl number increases for both types of shear thickening and shear thinning fluids. The effects are more significant in the case for shear thinning fluids.
Efficacy of Cupping in the Treatment of Hypertension Disease Using Graph Colouring
Authors: Elizabeth Marta a/p , Yusof Yuhani Binti , Bin Mohamad Mohd Sham , Abu Bakar Muhamad Faiz , Ibrahim Mohd Adhha 
Published: November 2019

Abstract
Cupping therapy also well known as Hijama is an ancient and holistic method for treatment variety of infirmities particularly cardiovascular diseases such as hypertension. In this method, suction mechanism used to create partial vacuum inside the cup that mobilizes the blood flow and promotes effective healing at the specific point. As practise, the selection of the points based is on patient’s complaints. The aim of this study is to identify the least number yet the most effectiveness point at minimal cost to treat hypertension disease. The graph colouring method is applied, besides C# language is used to validate the result. The finding of this research indicates that the optimum number of hypertension medical cupping points is two.
Turbulent natural convection combined with entropy generation in a nanofluid cavity with non-uniformly heated side walls
Authors: Pop I , Sheremet M A 
Published: November 2019

Abstract
The two-dimensional turbulent natural convection and entropy generation within an alumina-water nanoliquid chamber in the presence of sinusoidal temperature profiles at vertical walls is calculated. The considered process has been modelled using the RANS (Reynoldsaveraged Navier–Stokes) approach for turbulent regime and Boussinesq approximation for the buoyancy force. The control equations written using the non-dimensional stream function, vorticity and temperature variables combined with parameters of standard κ-ε turbulence model have been solved by the finite difference method with non-uniform computational mesh. The special algebraic transformation has been used for an introduction of the non-uniform mesh in physical domain. The influence of the nano-sized particles concentration and Rayleigh number on the nanofluid circulation and energy transport patterns has been examined.
About existence of quasi-double lines of the partial mapping of space En
Authors: Matieva Gulbadan , Abdullayeva Cholpon , Ahmedov Anvarjon 
Published: November 2019

Abstract
In domain Ω ⊂ En it is considered a set of smooth lines such that through a point X ∈ Ω passed one line of given set. The moving frame

ℜ
=

(

X
,

e
→

i

)

(

i
,
j
,
k
=

1
,
n

¯

)

is frame of Frenet for the line ωi of the given set. Integral lines of the vector fields

e
→

i

are formed net ∑n of Frenet. There is exist the point

F
i
n

∈

(

X
,

e
→

1

)

on the tangent of the line ωi. When the point X is shifted in the domain Ω, the point

F
i
n

describes it’s domain

Ω
i
n

in E
n. It is defined the partial mapping

f
i
n

:
Ω
→

Ω
i
n

such that

f
i
n

:

(
X
)

=

F
i
n

Necessary and sufficient conditions of of quasi-double lines of the partial mapping

f
i
n

of space En are proved.
Solving the Goods Transportation Problem Using Genetic Algorithm with Nearest-Node Pairing Crossover Operator
Authors: Rahman Amirah , Shahruddin Nazmi Syazwan , Ishak Ismail 
Published: November 2019

Abstract
Goods transportation is a critical part of supply chain management and the distance covered in the delivery process indirectly reflects the sustainability level of the supply chain, especially in the environmental aspect. In the wake of climate change issues faced worldwide and the increasing public concern in pollution reduction, it would be in the best interest of companies to not just minimize their operational costs but to also do their part in reducing externalities such as air pollution and noise pollution. In this study, a goods transportation problem is tackled to reduce the distance covered in the transportation process by modelling the problem as a Travelling Salesman Problem (TSP) and solving it using Genetic Algorithm. We propose a new crossover operator namely the Nearest-Node Pairing Crossover (NNPX) that is specifically designed to tackle a Travelling Salesman Problem (TSP) by exploiting the distance aspect of the problem. We evaluate the performance of NNPX compared to two other crossover operators: Order Crossover (OX) and Position-Based Crossover (PBX). The results reveal that the performance of NNPX is outstanding compared to OX and PBX. We found that NNPX has a better rate of convergence as it consistently yields lower distances in fewer iterations. In addition, NNPX does not depend on a large population size for faster convergence. In a nutshell, this study proposes a new crossover operator NNPX that is comparatively more efficient when used to solve the goods transportation problem, thus reducing the associated operational cost and externalities.