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Development of sensor-based learning tool for the study induction magnetic force for high school students

AIP Conference Proceedings 2021年第1期2320卷

作者： Bambang Heru Iswanto Tugu Arip Pianto S. Sunaryo 1Master Program of Physics Education FMIPA Universitas Negeri Jakarta Indonesia

Important fundamental concepts in magnetostatics are the magnetic field and the magnetic force. However, students often experience misconceptions about these concepts because of differences in their understanding and interpretation. In this study, a learning tool is designed to demonstrate the inductive magnetic force to objects due to an induced magnetic field. This learning tool is an integrated system consisting of a magnetic sensor, an Arduino microcontroller, and an electric coil. To demonstrate the magnetic force, an object of mini cylindrical metal is inserted into a straw that is placed in the electric coil. The experimental data show a positive correlation between the object displacement with magnetic field strength, as well as magnetic fields to the electric currents in the coil. This toolkit may be used as a magnetostatic learning tool for students in high schools.

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The effect of inquiry models and motivation to study on students’ cognitive learning outcomes in straight motion learning at senior high school (A case study)

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AIP Conference Proceedings 2021年第1期2320卷

作者： Nokadela Basyari Cecep E. Rustana Bambang Heru Iswanto 1Master Program of Physics Education FMIPA Universitas Negeri Jakarta Jl. Rawamangun Muka Jakarta Indonesia 13220

The effectiveness of learning on physics learning outcome is influenced by various factors, including the learning model used and student learning motivation. This research is a case study of the implementation of the inquiry learning model on straight motion material with the research subjects of Class X students at SMAN 1 Basa Ampek Balai, Pesisir Selatan, West Sumatra. The research objective was to determine the effect of inquiry learning models and learning motivation on student cognitive learning outcomes. The research was conducted using a quasi-experimental research method with a pre-test post-test design using two groups, the experimental group and the control group as a comparison. The sample of this research was 70 students and divided into two groups, the experimental group was given an inquiry learning model and the control group with conventional learning. Both groups were measured their learning motivation using a questionnaire. The results showed that there were significant differences in student learning outcomes with conventional inquiry and learning models. This is based on the results of The Mann-Whitney test with W = 1831.0 which corresponds to a p-value < 0.05, which means that the medians of the two groups are significantly different at α = 0.05. Inquiry learning model improves Straight Motion learning outcomes by obtaining an average N-gain score of 41.95%. In addition, the study also found that there was a significant interaction effect between the inquiry learning model and learning motivation on students' cognitive learning outcomes.

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Preliminary analysis and the need for physics learning in SMAN 1 Koto Baru

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AIP Conference Proceedings 2021年第1期2331卷

作者： Irena Retno Damayanti Yohandri 1Master Program of Physics Education Faculty of Mathematics and Natural Science Universitas Negeri Padang Jl. Prof. Hamka Padang Sumatera Barat Indonesia 25131

This article describes a preliminary study on students’ characteristics and their needs in physics learning at SMAN 1 Koto Baru. This study was conducted to evaluate the characteristics of the students and to analyze the need of teacher responses assessment in physics learning activities. The sort of research to be used is research and development. This research uses descriptive statistical methods. Items developed in the form of E-Book based on Project Based Learning (PJBL) models sponsored by the Science Laboratory Kit, physics content class X. The model of growth uses the Plomp model. Researchers used interview cards, instructor questionnaires and student questionnaires to collect initial data. Initial data collection was carried out at SMAN 1 Koto Baru. Based on the findings of the survey observations, the results of the analysis on students’ characteristics shows the percentage of attitudes at 66.67%, initial ability at 62.50%, learning styles at 70%, learning interest at 58.3%, and the motivation at a percentage of 68.75%. Analysis of the needs reflected in the performance analysis at 82.14%, the standard graduation analysis is based on the analysis of attitudes at 80%. The acquisition of knowledge at 54.16% and the skill at 46.43%. E-Book can encourage students to participate actively in the materials discussed. The Science Laboratory Kit will help teachers understand. Such work will produce true, realistic and efficient products. Therefore, the learning activities becomes meaningful, and can improve students' competence.

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Coefficient of restitution dependence of intruder rise time in two-dimensional Brazil-nut effect

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AIP Conference Proceedings 2016年第1期1723卷

作者： T. Kesuma D. P. Purwa Aji S. Viridi Suprijadi 1Master Program in Computational Science Institut Teknologi Bandung Bandung 40132 Indonesia 2Master Program in Computational Science Institut Teknologi Bandung Bandung 40132 Indonesia 3Department of Physics Institut Teknologi Bandung Bandung 40132 Indonesia 4Department of Physics Institut Teknologi Bandung Bandung 40132 Indonesia

Brazil-Nut Effect (BNE) is a granular material phenomenon, where larger grains (usually known as intruder) rise to the top when the granular system vibrated. We observe a single intruder rise time of BNE phenomenon in a two-dimensional molecular dynamics simulation of hard spheres collision scheme. Some experiments have shown that some granular properties, such as size and density ratio, play an important role to determine the rise time. However, other property, such as coefficients of restitution, is considered not to have a measurable impact. We explore the intruder inelasticity dependence of the rise time by varying its coefficient of restitution. We found that the intruder rise time tends to be flat for relatively high coefficient of restitution and increases exponentially below a certain deflecting point for low coefficient of restitution. This holds for specific mass ratio.

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Synthesis of silver nanoparticles using laser ablation method utilizing Nd:YAG laser

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AIP Conference Proceedings 2019年第1期2202卷

作者： Mohammad Zamakhsari Alhamid Beny S. Hadi Ali Khumaeni 1Master Program of Physics Department of Physics Faculty of Science and Mathematics Diponegoro University Tembalang Semarang 50275 Indonesia 2Department of Physics Faculty of Science and Mathematics Diponegoro University Jl. Prof. Soedharto SH Tembalang Semarang 50275 Indonesia

Silver nanoparticles (AgNPs) have attracted many researchers and scientist within the past decade due to their unique characteristics in physical, chemical, and biological properties compared to their macro scale. The AgNPs have been important subject of interest in applied science and material field and widely applied for various applications in the field of physics, chemistry, biology, environment, and medicine. The techniques usually used to synthesize silver nanoparticles are chemical, biological, and physical methods. However, chemical and biological methods still suffer from tedious sample pretreatment, contamination from additional agents during synthesis process, and quiet hazard and expensive. In this study, silver nanoparticles was synthesized using pulse laser ablation method. Experimentally, a high-purity silver plate (99, 95 %) was immersed in 25 ml pure aquades placed in a petri dish with a diameter 50 mm. A pulsed (Nd : YAG) laser (New Polaris II 1064 nm, max energy of 50 mJ, 7 ns) was focused on the gold sample target by a convex lens with a focal length of 30 mm. The laser repetition rate was 10 Hz, and the duration of laser bombardment was 13 hours. The results show that colloidal silver nanoparticles has yellowish colour. Furthermore, the produce silver nanoparticles have spherical shape with an averaged diameter size of tens nm. Detail results and discussion will be presented during presentation.

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Comparative analysis of median and Laplacian filter to detect edges of non-contrast cardiac CT image

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AIP Conference Proceedings 2022年第1期2391卷

作者： Nur Endah Sari Prawito Prajitno Djarwani Soeharso Soejoko 1Master Program of Science Department of Physics Faculty of Mathematics and Natural Science Universitas Indonesia Kampus UI Depok Jawa Barat Indonesia 2Department of Physics Faculty of Mathematics and Natural Science Universitas Indonesia Kampus UI Depok Jawa Barat Indonesia

The incidence of heart disease is increasing every year. One of the preventive actions is through early detection of the disease to take further action. Computer-Aided Diagnosis (CAD) helps doctors and cardiologists detect heart abnormalities seen in non-contrast cardiac CT images faster than manual detection. This study aims to detect the edges of non-contrast cardiac CT images. The method used is the Median and Laplacian filter algorithm using Matlab. The result shows that there is an automatic edge detection of non-contrast cardiac CT images. The conclusion obtained by the Laplacian filter with -8 kernel at its centre is clearer to detect edges of non-contrast cardiac CT images than the Median and Laplacian filters with -4 kernel at the centre. The study results are useful for medical image processing to facilitate the subsequent image analysis stage.

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Gravity data inversion to determine 3D topographycal density contrast of Banten area, Indonesia based on fast Fourier transform

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AIP Conference Proceedings 2015年第1期1656卷

作者： Ayuty Windhari Gunawan Handayani 1Master program of Physics Departement ITB Indonesia E-mail address :EstyWindhari88@*** 2Departement of Physic ITB Jl. Ganesha 10 Bandung 40132 Tel & Fax: +62-22-250 0935 Indonesia E-mail address :GunawanHandayani@***

The 3D inversion gravity anomaly to estimate topographical density using a matlab source code from gridded data provided by Parker Oldenburg algorithm based on fast Fourier transform was computed. We extend and improved the source code of 3DINVERT.M invented by Gomez Ortiz and Agarwal (2005) using the relationship between Fourier transform of the gravity anomaly and the sum of the Fourier transform from the topography density. We gave density contrast between the two media to apply the inversion. FFT routine was implemented to construct amplitude spectrum to the given mean depth. The results were presented as new graphics of inverted topography density, the gravity anomaly due to the inverted topography and the difference between the input gravity data and the computed ones. It terminates when the RMS error is lower than pre-assigned value used as convergence criterion or until maximum of iterations is reached. As an example, we used the matlab program on gravity data of Banten region, Indonesia.

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Subsurface characterization of Diwak-Derekan geothermal field by HVSR analysis method based on mictrotremor data

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AIP Conference Proceedings 2020年第1期2296卷

作者： Vithya Arintalofa Gatot Yuliyanto Udi Harmoko 1Master Program of Energy School of Postgraduate Studies Diponegoro University Jl. Imam Bard}o SH No.5 Pleburan Semarang 50241 Indonesia 2Department of Physics Faculty of Science and Mathematics Diponegoro University Jl. Prof. Soedharto SH Tembalang Semarang 50275 Semarang Indonesia

The research aims to analyze the subsurface structures that are manifested in geothermal represented by using the Horizontal to Vertical Spectral Ratio (HVSR) method. The data is obtained by microtremor recording, which obtains the dominant frequency value and amplification factor that will give the value of the wave velocity P (Vp) and the wave velocity S (Vs). The results of the study at 52 measurement points were processed using Geopsy and Surfer 13. The results of microtremor data processing using the HVSR method obtained the distribution of dominant frequency values around 0.08 to 9.29 Hz, the distribution of amplification factor values around 0.03 to 7.07, the distribution of Vp values around 390 m/s to 4993 m/s and the distribution of Vs values around 190 m/s to 3054 m/s. Manifestation area of Diwak- Derekan is located on the weak zone, based on the subsurface structural analysis, a possibility of normal fault is also identified, it causes manifestation of hot water springs on the surface. The Poisson's Ratio shows subsurface lithology mostly in the form of sandy loam, and a small portion of silt and saturated clay. The analysis of Poisson's Ratio shows the geothermal manifestation area is possibly a geothermal system that the fluid type is dominated by vapor/steam. The result explains that microtremor analysis by HVSR method can be utilized to subsurface interpretation for characterization purpose of the study area.

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2D simulation analysis of electron distribution in p+-Si/n+-GaAs heterojunction using Archimedes 2.0.1, Monte Carlo simulator

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AIP Conference Proceedings 2020年第1期2314卷

作者： Dita Puspita Lutfi Rohman Agus Subekti Herri Trilaksana 1Master Student Program Department of Physics Faculty of Mathematics and Natural Sciences University of Jember Jl. Kalimantan No 37 Jember 68121 Indonesia 2Advance Research Group Department of Physics Faculty of Mathematics and Natural Sciences University of Jember Jl. Kalimantan No 37 Jember 68121 Indonesia 3Advance Research Group Department of Physics Faculty of Sciences and Technology Airlangga University Jl. Mulyorejo Surabaya 60115 Indonesia

The results of simulations and analyzes that have been carried out using Archimedes 2.0.1 are compared to the results of experiments that have been published. The characteristic is a current-voltage graph at p+-Si / n+-GaAs heterojunction. The comparison shows very good accuracy, 99.99%. The purpose of our study is to determine and explain the distribution of electrons in the depletion region, and their effects on the bias voltage applied to p+-Si / n+-GaAs heterojunction. From the simulation and analysis results obtained the depletion region is indicated at around the point 515 to 520 µm. Also, there is an influence on the bias voltage applied to p+-Si / n+-GaAs heterojunction, which is indicated by increasing the electron density value in the depletion region, because there are more electrons flowing in the device.

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Reducing room noise using polyurethane-urea biofoam/industrial plywood sawdust waste (PUU/IPSW)

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AIP Conference Proceedings 2020年第1期2296卷

作者： Herlina Nofitasari Mohammad Masykuri Ari Handono Ramelan 1Master of Environmental Science Study Program Postgraduate Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta Indonesia 2Chemistry Education Department Faculty of Teacher Training and Education Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta Indonesia 3Physics Department Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta Indonesia

Rapid industrial growth leads to environmental problems, including room noise problems. Noise-reducing materials in the market have not fully reduced the maximum noise intensity to 85 dB yet according to the standard quality of room noise. On the other hand, the plywood industry produces sawdust waste that has not been widely used. The synthesis of noise reduction material with sawdust waste additives is the right alternative. This research aims to synthesize and characterize the polyurethane-urea/plywood sawdust waste (PUU/IPSW) biofoam as a noise reducing material. The PUU/IPSW biofoam synthesis method is performed using a one shot process technique with variations in waste composition of 0 - 5% (w/w), maleic anhydric (MAH) 0.1% (w/w) as a coupling agent and ethylenediamine (EDA) of 1% (w/w) as a chain extender. Structural identification of biofoam was carried out using Fourier Transform Infra-red Spectroscopy (FTIR). The acoustic test was carried out according to ASTM-E1050 standards. From the visual observation, it shows that PUU/IPSW biofoam has physical characteristics of the yellow-brown color and soft-hard texture. Based on FTIR spectra identification, biofoam contains CH, CO and OH chemical groups. The results of acoustic performance test show that the biofoam noise absorption coefficient is very good.

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