Mikrajuddin Abdullah
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View article: Analyzing the Determinants of Women’s First Birth Interval in Bangladesh: An Application of the Log-normal AFT Model
Analyzing the Determinants of Women’s First Birth Interval in Bangladesh: An Application of the Log-normal AFT Model Open
The waiting time to first birth is considered to be an economic empowerment indicator of women in any country. It plays a crucial role in determining population growth, demographic changes, and age structure. It is also linked up with the …
View article: Click, Watch, Learn: Motivational Drivers of YouTube Usage among Economics Students
Click, Watch, Learn: Motivational Drivers of YouTube Usage among Economics Students Open
View article: Optimalisasi Manajemen Kinerja dan Teknologi Digital dalam Meningkatkan Kualitas Pelayanan Publik pada Disdukcapil Kota Surabaya
Optimalisasi Manajemen Kinerja dan Teknologi Digital dalam Meningkatkan Kualitas Pelayanan Publik pada Disdukcapil Kota Surabaya Open
This study aims to analyze strategies for improving service quality at the Population and Civil Registration Office (Disdukcapil) of Surabaya City through performance management of apparatus, optimization of digital technology utilization,…
View article: Green synthesis of ZnO-red betel nanocomposites (<i>Piper crocatum Ruiz & Pav</i>) and their antibacterial activity
Green synthesis of ZnO-red betel nanocomposites (<i>Piper crocatum Ruiz & Pav</i>) and their antibacterial activity Open
Antibacterial resistance has been a major global health problem, requiring the development of alternative antimicrobial agents. This research studied the synthesis and properties of zinc oxide (ZnO)-red betel nanocomposites, mainly focused…
View article: A Comparison between Methods for Estimating the Restricted Gamma Ridge Regression Model Using the Simulation
A Comparison between Methods for Estimating the Restricted Gamma Ridge Regression Model Using the Simulation Open
In this paper, we discuss estimating the parameters of the restricted gamma ridge regression model by combining gamma ridge regression with restricted maximum likelihood. The characteristics of the new estimator and its superiority over th…
View article: THE IMPACT OF INTER-AGENCY COLLABORATION TOWARD BORDER SECURITY IN MALAYSIA
THE IMPACT OF INTER-AGENCY COLLABORATION TOWARD BORDER SECURITY IN MALAYSIA Open
Since Malaysia's independence, several government agencies have been established to regulate border security, including the Malaysian Armed Forces, Royal Malaysian Police, Malaysian Maritime Enforcement Agency, Immigration Department of Ma…
View article: DRIED NATA DE COCO WITH WATER ABSORPTIVITY COMPETING SILICA GEL
DRIED NATA DE COCO WITH WATER ABSORPTIVITY COMPETING SILICA GEL Open
Nata de Coco (NDC) is a network of cellulose fibers that traps abundant of water. If a freshly made NDC is dried to remove nearly all trapped water, we will get a very hygroscopic material. This material is potential for making water adsor…
View article: Facile Synthesis of Nanocomposite ZnO and Red Betel (Piper crocatum Ruiz & Pav)
Facile Synthesis of Nanocomposite ZnO and Red Betel (Piper crocatum Ruiz & Pav) Open
Green synthesis of zinc oxide nanoparticles is one of the most widely conducted research nowadays. The need for a facile and environmental synthesis method for nanomaterial is something interesting to develop. Red betel, which is a typical…
View article: Theoretical foundation for the Pareto distribution of international trade strength and introduction of an equation for international trade forecasting
Theoretical foundation for the Pareto distribution of international trade strength and introduction of an equation for international trade forecasting Open
I propose a new terminology, international trade strength, which is defined as the ratio of a country's total international trade to its GDP. This parameter represents a country's ability to generate international trade by utilizing its GD…
View article: A New Approach to Overcoming Zero Trade in Gravity Models to Avoid Indefinite Values in Linear Logarithmic Equations and Parameter Verification Using Machine Learning
A New Approach to Overcoming Zero Trade in Gravity Models to Avoid Indefinite Values in Linear Logarithmic Equations and Parameter Verification Using Machine Learning Open
The presence of a high number of zero flow trades continues to provide a challenge in identifying gravity parameters to explain international trade using the gravity model. Linear regression with a logarithmic linear equation encounters an…
View article: The stable and unstable oscillations of a rod attached to many springs
The stable and unstable oscillations of a rod attached to many springs Open
The oscillation equations of a multi-spring system connected to a rod are developed. Oscillations can be stable or unstable depending on the distribution of the spring constant and the number of springs. The symmetrical spring distribution…
View article: Trajectories of electric charges passing through an ideal solenoid and a thin conducting pipe arranged coaxially
Trajectories of electric charges passing through an ideal solenoid and a thin conducting pipe arranged coaxially Open
We discuss the effect of fields produced by a coaxially arranged ideal solenoid and thin conducting pipe on electric charge trajectories. The electric charges released from positions outside the solenoid/pipe are trapped by electric and ma…
View article: Nanosilica Particulate Magnetic as Alternative Filler on Natural Rubber Composites with Human-Tissue-Like Mechanical Characteristic
Nanosilica Particulate Magnetic as Alternative Filler on Natural Rubber Composites with Human-Tissue-Like Mechanical Characteristic Open
There have been no reports of the simultaneous application of natural fillers, such as magnetite and natural zeolites, to increase the strength of composites containing silica (SiO2) fillers as reinforcing fillers in natural rubber. This s…
View article: Introducing Cashless Transaction Index based on the Effective Medium Approximation
Introducing Cashless Transaction Index based on the Effective Medium Approximation Open
The effective medium approximation (EMA) method is commonly used to estimate the effective conductivity development in composites containing two types of materials: conductors and insulators. The effective conductivity is a global paramete…
View article: The effect of TiO<sub>2</sub> photocatalyst towards methylene blue degradation using simple dip coating
The effect of TiO<sub>2</sub> photocatalyst towards methylene blue degradation using simple dip coating Open
The purpose of a recent study is to evaluate the performances of TiO 2 in destroying organic effluent. TiO 2 photocatalyst presented a high performance in eliminating methylene blue (MB). Technical anatase of titania was employed. Dip coat…
View article: The slope of dry granular materials surface is generally curved
The slope of dry granular materials surface is generally curved Open
View article: Physics of Bamboo Rifle
Physics of Bamboo Rifle Open
We conducted simple experiments and derived physics equations to explain the working principle of a bamboo rifle. This toy is often played by children in many places that have bamboo plants, such as in ASEAN countries. We identified two ma…
View article: Coulomb-like Model for International Trade Flow and Derivation of Distribution Function for Trade Flow Strength
Coulomb-like Model for International Trade Flow and Derivation of Distribution Function for Trade Flow Strength Open
To describe international trade flows, we propose the coulomb force formulation, in which the magnitude of the charge represents gross domestic product (GDP) and the distance between countries is the bilateral distance, the product of spat…
View article: Kite festival: the physics behind the oscillations of a kite’s long tail
Kite festival: the physics behind the oscillations of a kite’s long tail Open
When we watch a flying kite with a long tail hanging beneath, the tail sometimes oscillates and sometimes maintains a static shape. Generally, the tail portion deviates more when moving toward the free (bottom) end. The shape of the tail i…
View article: Physics Model for Rope Jumping Game
Physics Model for Rope Jumping Game Open
We developed a simple physics model to explain the profile of the rope played in the rope jumping game. Firstly, we derived a second order non-linear differential equation to explain the rope motion. Analytical solutions can be obtained if…
View article: Bending of Spaghetti Beams and Columns Exposed to Hot Steam Reveals Several Physical Properties of the Spaghetti
Bending of Spaghetti Beams and Columns Exposed to Hot Steam Reveals Several Physical Properties of the Spaghetti Open
In this paper, we show that bending of spaghetti beams and columns exposed to hot steam reveals the time evolution of young modulus, the diffusion coefficient of water molecules penetrating the spaghetti, the partial Fickian behavior of wa…
View article: Landscape geometry-based percolation of traffic in several populous cities around the world
Landscape geometry-based percolation of traffic in several populous cities around the world Open
We described the average traffic congestion in several populous cities around the world from a new concept, namely landscape percolation. The ratio of the residential area size to road width is a fundamental parameter that controls the tra…
View article: Inexpensive solar cell using TiO<sub>2</sub>/coffee composite as photon absorbing material
Inexpensive solar cell using TiO<sub>2</sub>/coffee composite as photon absorbing material Open
Solar cell using TiO 2 /coffee composite as photon absorbing material has been successfully fabricated. A suspension of TiO 2 /coffee was dropped on Fluorine Tin Oxide substrate which was previously heated on a hotplate with temperature of…
View article: Why the same key can open different padlocks?
Why the same key can open different padlocks? Open
We accidentally observed that one key can open two padlocks from different brands. Based on this observation, here we derived equations to estimate the number of different padlocks that can be produced. We focus on simple padlocks that are…
View article: Size-dependent electron chemical potential in nanostructures derived from statistical configuration
Size-dependent electron chemical potential in nanostructures derived from statistical configuration Open
We rederived the fermion distribution function by considering the effect of assembly size. We did not use Stirling approximation to avoid the deviation generated by this approximation for a small number of constituents and small assembly s…
View article: Experiment and modeling of the rice winnowing process: granular segregation method from an ancient era
Experiment and modeling of the rice winnowing process: granular segregation method from an ancient era Open
View article: Coating of TiO<sub>2</sub> nanoparticles in the surface of transparent plastic grains and its aplication for photocatalyst under solar irraidation
Coating of TiO<sub>2</sub> nanoparticles in the surface of transparent plastic grains and its aplication for photocatalyst under solar irraidation Open
A cylinder milling has been modified by adding a heating controller for coating TiO 2 photocatalyst on the surface of polymer at constant temperature. By testing the polystyrene, polypropylene, and linear-low-density polyethylene polymer d…
View article: Second-order phase transition and universality of self-buckled elastic slender columns
Second-order phase transition and universality of self-buckled elastic slender columns Open
Self-buckling is an interesting phenomenon that is easily found around us, either in nature or in objects made by human. Palm fronds which initially directed upward when they were short and turned into bending after appreciably longer is a…
View article: Dried nata de coco for extend the shelf life of fruits
Dried nata de coco for extend the shelf life of fruits Open
We reported preliminary study about dried nata de coco for extend the shelf life of fruits We made nata de coco by mixing coconut water and adding Acetobacter xylinum. Nata de coco was dried and compacted with hot press. The design of nata…
View article: TiO<sub>2</sub> Photocatalytic Degradation of Methylene Blue Using Simple Spray Method
TiO<sub>2</sub> Photocatalytic Degradation of Methylene Blue Using Simple Spray Method Open
The present work focused on the effects of TiO 2 in degrading organic wastewater. Technical TiO 2 of anatase crystalline phase was used. TiO 2 photocatalyst showed a powerful result in destroying organic effluent. Spray coating was conduct…