bluuebunny/crossref_metadata_2025_split huggingface dataset:
Implementation of ARCS models to improve teachers’ ability in flipped classroom learning
Authors: Bhakti Y B , Astuti I A D , Sumarni R A , Sulisworo D , Toifur M 
Published: March 2021

AbstractThis research aims to improve the ability of the teacher’s Junior High School in practicing flipped classroom learning in physics lessons. A quantitative approach with the type of descriptive was chosen to the research by modeling of one group pre-test and post-test design. The subject of the research was 34 physics teachers in Junior High School, which is 13 of male teachers and 21 female teachers. Data were collected by observed the activities, giving of questionnaires and holding of the test. In consequence, instrumentations used for the research were observation sheets, qestionnaires, and multiple-choice questions. The result showed that activities were slightly increased from meeting I with a percentage of 78%, meeting II with a percentage of 83.05% and meeting III with a percentage of 87.28%. According to the questionnaire, teachers’ motivation was good with a percentage of 79.81% and teachers’ interest was very good with a percentage of 82.73%. Therefore, it can be concluded that using of ARCS can improve not only learning outcomes but also the motivation and interest of teachers. This study may have contributed to the literature since there are few studies available regarding the flipped classroom approach adapted to the ARCS motivation model on physics learning at school.
Characterization of vickers hardness and corrosion rate of stainless steel-316L coated with hydroxyapatite-polyvinyl alcohol
Authors: Aminatun  , Tenong F F S B , Hikmawati D , Setiawati E M 
Published: March 2021

AbstractThis study aims to determine the effect of variations in the composition of the hydroxyapatite-Poly Vinyl Alcohol (HA-PVA) coating to the Vickers hardness and the corrosion rate of SS316L. Cylindrical stainless steel-316L (SS316L), which has a diameter of 8mm and a thickness of 5mm, was sterilized by immersion in ethanol then rinsed using distilled water. The coating material is made from a mixture of HA-PVA with variations in the composition of A (27: 3), B (25: 5), C (20:10) and D (15:15) (in wt%) dissolved in 70% distilled water (in wt%). HA-PVA solution was coated on SS316L using airbrush spraying method at a pressure of 3.5x105 Pa, a nozzle diameter of 0.4 mm and a nozzle-sample distance of 10 cm. The test results show that the variations of the HA-PVA composition affect the hardness and the corrosion rate of SS316L. The more HA coating on the SS316L, the more it protects the SS316L substrate from corrosion. The conclusion show that the sample A with the HA-PVA composition of 27: 3 (in wt%) is found to be the best composition with a Vickers hardness of 2.43 VHN and a corrosion rate of 0.004 mm/year.
Morphology study of Agave fiber surface by using scanning electron microscopy
Authors: Mulyaningsih N N , Widiyatun F , Dwitiyanti N 
Published: March 2021

Abstract
Agave plants can grow well in all weather conditions, so that they are very abundant in Indonesia. The appropriate processing technique is needed to develop the utilization of Agave plants, so that they have a higher value. The main purpose of this research is to conduct material engineering of Agave americana species, so that the Agave fiber has good quality when used as a natural composite material. The research method was used by giving 5% alkaline sodium hydroxide (NaOH) treatment for 30 minutes against Agave fiber (called T samples) and the results were compared with normal Agave fiber/not treated with alkaline (called UT samples). The parameters observed were the surface morphology of the fibers which were analyzed using Scanning Electron Microscopy (SEM) at magnifications of 250x, 500x and 1000x. SEM characterization results showed that Agave fiber treated with 5% NaOH alkaline had a denser surface morphology with an average cavity percentage of 9.015%, while untreated Agave fiber had a higher average cavity percentage of 29.795%. In addition, soaking with 5% alkaline NaOH also causes dirt that sticks to the fibers more easily, so the fibers were cleaner. The conclusion of the research shows that 5% alkaline NaOH treatment on Agave fiber could increase the strength and quality of Agave fiber.
Temperature and water level control in a multi-input, multi-output process using neuro-fuzzy controller
Authors: Akbariza M V , Handoko D , Prajitno P 
Published: March 2021

Abstract
In this research, a simulation study for temperature and level control in a liquid (water) mixing process is proposed using MATLAB/Simulink. The objective of this control system is to maintain the temperature and water level at the set points in a liquid mixing process by controlling the flowrate of cold and hot water that enters the mixing tank. The mixing tank used in this study is assumed to have a volume of 80 liter, while the maximum flowrates of both water inputs are 15 liter/min, and the maximum temperature and level in the mixing tank are 90 C and 75 cm, respectively. The influence of one variable to the other is reduced using decoupling technique. In the development process of the controller, PI controller is used to generate the training data required by the ANFIS-based controller. The performance of the proposed controllers has been tested with several set points changes by observing its performances parameters, such as RMSE, rise time, settling time, and % overshoot as quantitative data. It also has been compared with a PI controller using the same set point changes as the ANFIS-based controller did. These results show that the ANFIS-based controller is generally better than the PI controller. It has the average RMSE values of 0.174 and 0.196 for temperature and level control respectively, while the PI controller has 0.21 and 0.20 average RMSE values for temperature and level control.
Concentrating yellow and red gambier fruit (Uncaria) in isopropyl alcohol to improve the performance of dye-sensitised solar cells
Authors: Nasyori A , Noor F A 
Published: March 2021

Abstract
The organic dyes used in dye-sensitised solar cells (DSSCs) possess a low efficiency, leading to problems in the development of more efficient and cheaper DSSCs. In this work, we analysed the effect of the concentrations of organic dye from yellow and red gambier (Uncaria) fruits. The concentrations were prepared with isopropyl alcohol at concentrations of 30, 50 and 70%, respectively. Titanium oxide (TiO2) is a semiconductor which was used in this work by utilising the method of the doctor blade, and indium tin oxide (ITO) was used as the conductive glass. The counter electrode and electrolyte were fabricated by burning candle and mixing KI + I2, respectively. The characteristic spectra of UV-Vis and FTIR were used to analyse the gambier fruit. We obtained that the tannins from red and yellow gambier fruit extract are highly potential to apply as a sensitiser in DSSCs. Furthermore, the measurement of current and voltage was employed under sun irradiation. We obtained that the highest efficiencies were 0.819924 % and 1.747999 % for red and yellow extract, respectively. It indicates that the concentration of the organic dye could improve the performance of DSSCs.
K+
Λ and K
0Λ photoproduction with High-Spin Nucleón Resonances
Authors: Luthfiyah N H , Mart T 
Published: March 2021

Abstract
A new model for photoproduction of KΛ, i.e. γ + p → K+
Λ and γ + n → K
0Λ has been constructed by using the Feynman diagrammatic approach. By using this approach, we have calculated the scattering amplitude analytically. In addition, we have also included a number of very-high-spin nucleon resonances, i.e. those with spins 11/2 and 13/2, which are listed by the Particle Data Group (PDG). The unknown parameters in the model, i.e., the hadronic coupling constants, were extracted by fitting the calculated observables to nearly 9000 experimental data points. The result of the model calculations is compared with those of previous investigations and experimental data. From the comparison we may conclude that the constructed model can nicely reproduce the experimental data.
Preliminary evaluation of chemical component in the 2004 indian ocean giant tsunami impacted soil using a Co2 Laser Induced Breakdown Spectroscopy (LIBS)
Authors: Mitaphonna R , Ramli M , Ismail N , Kurihara K , Subianto M , Gondal M A , Idris N 
Published: March 2021

Abstract
Preliminary evaluation of chemical component in soil impacted by 2004 Indian Ocean giant tsunami using LIBS has been carried out. The sampling of the tsunami impacted soil was carried out in several points in Aceh, Indonesia. In this study, the sample soil was pretreated to turn into pellets. The beam of a TEA CO2 laser (10.6 µm, 3 J, 200 ns, 10 Hz) is sent onto surface of pellet using focusing lens under air at atmospheric pressure for producing a plasma. The emission spectral lines from plasma that generated were discovered when testing with Optical Multichannel Analyzer (OMA) system. It shows many emission lines because of various elements could clearly be detected and be identified. It was found that both the tsunami impacted and unimpacted soil sample contain chemical signatures of tsunami event such as saltwater signal (Na), carbonate markers (Ca, Mg, Sr), terestrial markers (Fe, Mn, Si Ti, Ba), and other heavy metal elements. However, it is found that emission intensities of the spectral lines are far higher for the tsunami impacted soil samples compared to the case of tsunami unimpacted soil. The qualitative observation finding implies that the chemical elements such as calcium (Ca), then followed by magnesium (Mg), and sodium (Na) are good candidate for chemical proxies of tsunami event. Since the measurement allows to simultaneously observe these elements in a single measurement, thus LIBS is a potential, simultaneous, efficient, and versatile spectroscopic technique not only for analyzing chemical component in soil affected by the tsunami but also to identify the tsunami impacted soil from the impacted soilThe first section in your paper.
The effect of a causalitic-learning model on problem-solving abilities reviewed from creativity
Authors: Anshori I A , Rokhmat J , Gunada I W , Wahyudi  , Ayub S 
Published: March 2021

Abstract
The purpose of this study was to investigate the effect of the implementation of the Causalitic-learning Model (CLM) on Problem-solving Ability (PSA) in terms of creativity. This study used an untreated control group design with pre-test and post-test. The sampling technique used purposive sampling and obtained students from XI-MIA-3 as the experimental class (11 male and 22 female) and XI-MIA-2 as the control class (14 male and 20 female). The assessment instrument uses 6 items in the essay test in physics. Data analysis used a two-way ANOVA test with a 2 x 2 factorial design. The results show homogeneous data (F
table = 1.75), and normally distributed (X
2t
able = 7.81), for the control class and experimental class, Hypothesis test results, with a significance level of 0.05, obtained Ha (sig.-value 0.01) and Hb (sig.-value 0.01) so that Ha and Hb are accepted, while for Hc (sig.-value 0.80) so Hc is rejected. Conclusion CLM affects PSA, creativity affects PSA, and there is no effect on the interaction between CLM and creativity on PSA. It is recommended to improve students’ PSA through CLM and or the development of student creativity.
Analysis of optical transition rules in buckled and puckered bismuthene monolayers based on electron-photon dipole vectors
Authors: Prakoso M J , Cahaya A B , Nugraha A R T , Majidi M A 
Published: March 2021

Abstract
When a material absorbs incident light, electrons can undergo an optical transition between valence and conduction bands depending on the frequency and polarization of light. In atomic-layered materials such as bismuthene, even a small change in its geometrical structure, e.g. from the buckled to puckered lattices, completely alters its electronic properties and, accordingly, its possible optical transitions. Since the strength and selection rule of optical transitions can be understood by analyzing the electron-photon dipole vectors, we calculate dipole vectors as a function of electronic wave vector between two quantum states in buckled and puckered bismuthene monolayers. We find that each of the bismuthene structures has its own, unique dipole vectors, implying a certain geometrical dependence of the dipole vectors. These materials are expected as a potential candidate for optoelectronics applications. Furthermore, one would consider applying various light polarization in these materials when the optical transition rules are well understood.
Ultrafast optical absorption and coherent phonon generation in monolayer and bilayer transition metal dichalcogenides
Authors: Nugraha A R T , Cahaya A B , Majidi M A 
Published: March 2021

Abstract
When ultrashort laser pulses are applied to the solid-state material within a time scale less than the period of a particular phonon mode, the energy and momentum of the absorbed light are used by photo-excited carriers to interact collectively with the crystal lattices and generate lattice oscillations coherently, known as the coherent phonons. The Fourier transform of the absorption modulation due to the coherent phonon oscillations gives the coherent phonon intensity. In this work, we theoretically investigate the shape of coherent phonon intensity for transition metal dichalcogenides as a function of the polarization angle of the laser pulses. In particular, we focus on the E2g and A1g phonons in monolayer and bilayer molybdenum disulfides. Within the simplified theory of displacive excitation of coherent phonons, we find that the laser pulses uniquely select the electronic states in monolayer and bilayer molybdenum disulfides, resulting in a rich feature of the polar plots of the energy-dependent coherent phonon intensity of these materials.
The electrical properties of poly(dA)-poly(dT) DNA molecule: electrical current influenced by magnetic field and electric field
Authors: Yudiarsah E , Adiansyah T 
Published: March 2021

Abstract
This theoretical study aims to determine the electrical properties of poly(dA)-poly(dT) DNA molecule under influence of electric and magnetic fields as external disturbances. The electrical properties of the DNA is investigated using a tight-binding model in the second quantization form. Then, the Landauer-Buttiker formalism is used in calculating electric current from the transmission probability which is calculate using the green function approach. While the external interference is considered by modelling the magnetic dependent hopping phase and the electric field dependent hopping amplitude in the tight binding Hamiltonian. The calculation results shows that the electric field applied along the DNA decreases sharply the peak of the transmission band. This means that the electric field significantly weakening the quality of transmission in poly(dA)-poly(dT) DNA molecule. On the other hand, the increase in magnetic field results in the increment of maximum current and the decrement of threshold voltage.
Room temperature electrical impedance analysis of LaFe1-x
MgxO3 (x = 0.01 and 0.05) ceramics
Authors: Ilham F , Triyono D , Abdillah M N 
Published: March 2021

Abstract
The effect of Mg-small doped on the structural and electrical properties of LaFe1-x
MgxO3 ceramic materials was studied. A series of LaFe1-xMgxO3 (x= 0.01 and 0.05) perovskite material was synthesized via sol-gel method following by sintering process. Structural properties were investigated by using X-Ray diffraction (XRD). Rietveld refinement analysis have been done using Fullprof software. All of the samples are single-phase with orthorhombic crystal structure and Pnma space group. Lattice parameter slightly increases as the Mg-doping concentration increase. The impedance spectroscopy of the sample was characterized by using the RLC-Meter at a frequency range of 100 Hz - 1 MHz at room temperature. The electrical parameters such as impedance, dielectric constant, tan loss, and conductivity was analyzed using impedance spectroscopy method. The value of the dielectric constant (∊) decreases with increasing frequency and remains constant at higher frequencies. The dielectric loss shows a decrease in the dielectric constant with increasing Mg doping.
Preliminary study of HVSR forward modeling: parameters properties and non-uniqueness of subsurface models
Authors: Zaenudin A , Rustadi  , Iswan  , Yogi I B S 
Published: March 2021

Abstract
The application of horizontal to a vertical spectral ratio (HVSR) in Indonesia is often analyzed using theoretical equations that only focus on Vs. or the two rock layers’ thickness. On the other hand, there are already HVSR modeling programs that involve other parameters such as VP, density, QP, and Qs for multiple layers. Armed with existing modeling, the effect of each parameter and test the possible non-uniqueness of HVSR modeling is found. In the end, the right inversion method to get satisfactory results is found. Modeling is done by calculating the wave amplification of the transfer function, the phenomenon of attenuation, and dispersion. A synthetic model will be made from the modeling scheme, which is approached with various possible parameters using a random test of 200000 models for each test. From the existing parameters, it is found that only the parameters Vs, thickness, and Qs affect the position f0. Meanwhile, the parameters VP, density, and QP only affect the amplitude of the curve. The parameters VP, Vs, density, and thickness have a consistent relationship between parameters, but not for QP and Qs. From the various tests carried out, it was found that many combinations can produce similar responses, both parameter combinations, and combinations of parameters with a different number of layers. Inversion modeling is needed to produce a precise subsurface model that can reduce the non-uniqueness results, such as optimization with a global approach, a statistical approach, or a hybrid inversion method.
One hadron exchange non-relativistic model for potential
Authors: Glenno  , Fachruddin I , Salam A 
Published: March 2021

Abstract
One of the KN Interaction is K+p interaction which one we’re interested in. K+p potential is described as one hadron exchanges. The hadrons being exchanged include scalar meson (σ), vector mesons (ω, ρ ), hyperons (Λ, Σ), and their resonances ( Λ* (1600), Σ*(1385)). This interaction model is derived for non-relativistic calculations within Blankenbecler-Sugar reduction. The values of the potential parameters are fixed by fitting to experimental data of K+p spin-averaged differential cross section for kaon laboratory energies from 88.13 MeV to 3683.22 MeV. Scattering calculations are performed by using a 3D technique without partial wave expansion.
Charged Black Holes with exponential type nonlinear electromagnetic
Authors: Dipamanggala M A , Ramadhan H S 
Published: March 2021

Abstract
We study spherically-symmetric Einstein gravity coupled to nonlinear electrodynamics. In particular, we consider an exponential kinetic for of gauge field lagrangian. We found that the solution approaches Reissner-Nordstrom black hole asymptotically, but shows a distinct property near the origin.
Spin accumulation induced anisotropic RKKY interaction
Authors: Cahaya A B , Majidi M A 
Published: March 2021

Abstract
In a spin-valve structure, the magnetizations of the ferromagnetic layer are influenced by the RKKY exchange interaction. The RKKY exchange interaction is an indirect exchange interaction mediated by the conduction electron of the non-magnetic spacer. The RKKY exchange interaction has been widely studied both theoretically and experimentally. However, the effect of the spin accumulation in the spacer on the exchange interaction has not been studied yet. While the spin accumulation in the non-magnetic spacer is generally small, recent experiment show that non-magnetic metallic layer in magnetic multilayers can have a large spin accumulation. Utilizing linear response theory, we discuss the effect of the spin accumulation on the spin density of the conduction electron in the spacer and show that the spin accumulation induces an anisotropic exchange.
Perhaps a feasibility study of pocket book learning media in Newton law materials for class X Senior High School
Authors: Rahmandita A , Saraswati D L , Mulyaningsih N N , Ningsih R , Agustina L , Sari T A , Dinihari Y , A’ini Z F , Wiyanti E 
Published: March 2021

Abstract
The number of learning media at this time is still deemed insufficient that students can use to study independently anywhere and anytime. So we need a media companion to the main book that students can use, namely in the form of pocket books. The feasibility test was carried out by material experts, media experts, design experts and Senior High School Physics Teachers. the results of the product media expert test were quite good with a proportion of 70%, the material expert test was declared good with a proportion of 84%, the product design expert test was not good with a proportion of 64% and by education practitioners namely high school physics teachers declared good with a proportion of 88%. So that the overall feasibility of the product is 76.5% in the good category. So it can be concluded that the pocket book of Newton’s law material on Physics for class X senior high school students is in accordance with the appropriate syllabus and is suitable for use as a supporting book for learning physics.
Development of physics learning tools based on inquiry to increase creative thinking skills
Authors: Asy’ari M , Prayogi S , Mirawati B , Syarifuddin  , Hunaepi  , Syahrir  , Suhirman  
Published: March 2021

AbstractThis study aimed to produce physics learning tools based on inquiry that are valid, practical, and effective to improve students’ creative thinking skills on heat material. This study is a developmental research using the 4D (define, design, develop, disseminate) model. Learning tools in the form of syllabus, lesson plan, student activity sheets, student textbooks, and test instruments were validated by 2 experts before being implemented on 22 students. The research data were collected using instruments of validation, observation, questionnaires, and tests which were then analyzed descriptively and statistically. The results showed that the learning tools produced was valid in terms of content and construct, was practical based on the implementation of learning and student responses, and was effective in improving students’ creative thinking skills. Research findings based on indicators of creative thinking skills such as fluency, flexibility, originality, and elaboration are also described in this paper.