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271	Physics	ABS-34
Bluino: Blind Arduino Sensor to Assist Students with Visual Impairment Rossy Andini Herindra Putri(a), Annisa Fadhila Nur Fikriah (a), Diana Ayu Latifah (a), Shafa Rihadatul Aisy (a), Eliyawati (a), Eka Cahya Prima (a*) a) Department of Science Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, Indonesia *ekacahyaprima[at]upi.edu Abstract People with visual impairment are part of our society who have the same rights as a citizen which has limited mobility. They need technology to help navigation. Arduino is a microcontroller based technology which can be used to be walking assistance. We hereby propose ‘Bluino’ as walking support for visual impairment students. It is equipped with an ultrasonic sensor HC-SR04 to detect an object within 50 cm, which will trigger the buzzer to produce sound. Bluino is packed into a custom box with a strap placed on the users leg. Three students have evaluated this device. The result shows that the tool can detect an object or obstacle in front of them so they can avoid it. The sensor can detect an object up to 4 meters and 15 degrees measuring angle. They suggested to improve Bluino by simplifying the model, and enabling the sensor to detect holes. Keywords: Visual Impairment, Bluino, Arduino, Ultrasonic Sensor PermaLink | Plain Format | Corresponding Author (Rossy Andini Herindra Putri)

272	Physics	ABS-35
Peak Ground Acceleration on Bedrock using Probability Seismic Hazard Analysis methods for Bandung city Anggun Mayang Sari (a*), Arifan Jaya Syahbana(a), Afnindar Fakhrurrozi(a) (a) Research Center For Technology, Indonesian Institute of Sciences (LIPI), Jl. Sangkuriang, Bandung 40135,Indonesia *anggunmayangsari[at]gmail.com Abstract As one of the largest cities in Indonesia, Bandung city consists of dense populations that geologically surrounded by earthquake hazard. Rapid structural-building and infrastructure facilities development forced the local government to put a concern about the dynamic impact. Therefore, a study on Peak Ground Acceleration (PGA) bedrock to analyse seismic hazard is a necessity. This study used the latest updated seismic sources data to model seismic ground motion to particular location. Here, Probability Seismic Hazard Analysis (PSHA) methods were applied using EZ-FRisk and OpenQuake software. These two methods developed to show some variety models of peak ground acceleration value on bedrock. Ez-FRisk models used randomly 9 points locations, while OpenQuake used gridded points to the whole Bandung city to generate PGA analysis. As a result, PGA bedrock using EZ-FRisk software ranged between 0,48-0,62g, while OpenQuake showed 0,46-0,63g. These results validated using Indonesian Hazard Map 2017 using PGA on 2475 years return period, represented similar values about 0.50-0.60g. In order to provide spatial information, these results visualised using Geographic Information System (GIS) application. Furthermore, this study expected to give contribution on scientific information for the development planning, especially for designing earthquake resistant buildings. Keywords: PGA Bedrock; PSHA; EZ-Frisk; OpenQuake; GIS PermaLink | Plain Format | Corresponding Author (Anggun Mayang Sari)

273	Physics	ABS-62
MODELING OF TUNNELING CURRENT IN BILAYER ARMCHAIR GRAPHENE NANORIBBON−TUNNELING FIELD EFFECT TRANSISTOR BY USING AIRY−WAVEFUNCTION APPROACH Shofi Dhiya Ulhaq*, Muhammad Fulki Fadhillah, Intan Anjaningsih, Amelia Fadhillah, Endi Suhendi dan Andhy Setiawan Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Bandung 40154, Indonesia Abstract Metal oxide semiconductor field effect transistors (MOSFETs) has an important role in electric circuits with its nanoscale sizes. But with its small size, MOSFETs have performance limitation to work in ultra-low data, leaky currents, short channel effects, and increased speed. This performance limitation makes the tunneling field effect transistor (TFET) an alternative to replace the MOSFET. In this study, a drain current on devices based on bilayer armchair graphene nanoribbon (BAGNR) was modeled using the Airy function approach. Schrödinger equation solved with the Airy function approach produces a transmittance value, from this transmittance the drain current value can be determined from the Landauer formula with the help of the Gauss Legendre Quadrature (GLQ) method. The results of the modeling show that the drain current value increases with increasing gate voltage (Vg), drain voltage (Vd) and width of BAGNR while the increase in oxide thickness and temperature makes the drain current decrease. Keywords: Airy−wavefunction, tunneling current, BAGNR, TFET. PermaLink | Plain Format | Corresponding Author (Shofi Dhiya Ulhaq)

274	Physics	ABS-323
Synthesis And Characterization of Nanoparticles CaCO3/MgO as Antibacterial Zahrotul Jannah, Lydia Rohmawati, and Woro Setyarsih Universitas Negeri Surabaya Abstract Nanoparticles CaCO3/MgO by variation percent weight of MgO (5, 21, 22, 23, 24, and 25) wt.% potentially antibacterial can be synthesized by mixing methods and calcination at temperature 800 oC, which synthesis CaCO3 from shell fish (Anadara granosa) using carbonation methods by flow velocity of CO2 gas 2.8 liter/min. The successful nanoparticles were characterized by BET, antibacterial activity and PSA. Variation percent weight of MgO was used to determine pore size, surface area and antibacterial activity on nanoparticles CaCO3/MgO. The results showed that weight percent variation of MgO have different pore size and surface area that are included in the mesoporous category. CaCO3/MgO (5wt.%) has the smallest surface area (3.24 m2/g) and the largest pore size (20.12-29.35 nm), while CaCO3/MgO (24wt.%) has the largest surface area (65.05 m2/g) and the smallest pore size (3.23-3.59 nm) by the closed end of curve. The tip end of curve obtained at the sample CaCO3/MgO (21wt.%) which has the largest antibacterial activity by inhibitor diameter 31.0 mm on Staphylococcus aureus and 33.0 mm on Escherichia coli bacteria. The optimal nanoparticles has particle size <200 nm. Keywords: synthesis, characterization, nanoparticles, CaCO3/MgO, antibacterial PermaLink | Plain Format | Corresponding Author (Lydia Rohmawati)

275	Physics	ABS-72
Modeling of tunneling current of a bilayer armchair graphene nanoribbon-based p-n junction diode using Airy wave-function Amelia Fadhillah*, Intan Anjaningsih, Shofi Dhiya Ulhaq, Muhammad Fulki Fadhillah, Waslaluddin, Endi Suhendi Department of Physics Education, Universitas Pendidikan Indonesia, Bandung, Jawa Barat, Indonesia Abstract Armchair Graphene Nanoribbon (AGNR) is one of the Graphene Nanoribbon (GNR)’s type which can be role as a semiconductor or conductor depends on number of atoms that arrange its width . The unique of the electrical properties of AGNR attracted researchers to make graphene as material of semiconductor based device. Because of its tiny width, graphene is very good for application on devices with tunneling electron based. In this research, the author models the behavior of tunneling current on a bilayer armchair graphene nanoribbon-based p-n junction diode using Airy function. The modeling’s result show that the tunneling current has relation with bias voltage, temperature, and characteristic of BAGNR. The tunneling current is directly proportional to the forward-bias, the width of the BAGNR, and the intrinsic electric field. It is inversely proportional to the temperature. Its value on BAGNR is bigger than on MAGNR due to the effect of interlayer coupling γ_0 and γ_1 to the energi gap. The tunneling current using the Airy function method and the WKB method have the same tendency and slight different value. Keywords: BAGNR, p-n junction diode, tunneling current, Airy function PermaLink | Plain Format | Corresponding Author (Amelia Fadhillah)

276	Physics	ABS-94
ANALYSIS OF SOIL SPECIFIC GRAVITY ON PEAT SOIL IN LONGAN PLANTATIONS IN WEST KALIMANTAN REGION Gulistan Amalia Rahman(a*), Amalia Nurfitriani(a), Siti Inna Zainab(a), Aldi Rijaldi(a), Dwi Putri Desti Utami(a), Mimin Iryanti(a*), Ahmad Aminudin(a), Rossie Wiedya Nusantara(b) (a) Physics Study Program, Department of Physics Education, Faculty of Mathematics and Natural Science Education, Indonesia University of Education Jl. Dr. Setiabudi No.229 Bandung 40154, Indonesia. (b) Department of Soil Science, Faculty of Agriculture, Tanjungpura University. Jl. Prof Hadari Nawawi, Pontianak 78124 *gulistanrahman[at]gmail.com *mimin_iryanti[at]gmail.com Abstract Peat soils are soils that contain large amounts of organic matter. Utilization of peatlands as plantations has been carried out in West Kalimantan. One of the plants that is cultivated is Longan. Indicators that need to be known to determine the suitability of peatlands as plantations are specific gravity. Specific gravity is the ratio between the dry weight of the soil and the volume of the soil excluding the pores found between the particles. This study aims to determine the specific gravity characteristics of the longan peat estates in West Kalimantan. Measurement of specific gravity is done using ASTM D-854-02 - Pycnometer. The results obtained a specific gravity of 0.28 gcm-3 at depths of 03-350 cm and 0.38 gcm-3 at depths of 350-550 cm. The measurement results show that the specific gravity is getting bigger along with the increase in soil depth due to the reduced water content. Based on the results of research on peatlands in West Kalimantan suitable to be used as a Kelengkeng plantation land. Keywords: Specific gravity, water content, peat soil, longan PermaLink | Plain Format | Corresponding Author (Gulistan Amalia Rahman)

277	Physics	ABS-95
ANALYSIS OF SOIL AND ELECTRICAL PERMEABILITY IN GUAVA AND DRAGON FRUITS IN RASA Amalia Nurfitriani (a*) Mimin Iryanti (b), Ahmad Aminudin (b) Indonesia University of Education Jl. Dr. Setiabudi No.229, Isola, Sukasari,Bandung 40154 Abstract This Study has purpose of to determine the permeability characteristics and the electrical properties of the soil in guava and dragon fruit plantations. The measured land is peatland in the village of Rasau, West Kalimantan. The method for permeability (Falling Head) and electricity uses the Electrical Conductivity tool. Obtained from parameter values such as EC (Electrical Conductivity). At a depth of 350 cm -345 cm has a range of values of 0.02 ds -1 to 0.11 ds m-1, from that depth a soil permeability value of 4,198 x 10-5 cm s-1 is obtained. At a depth of 500 cm - 590 cm it has a range of values of 0.02 ds m -1 to 0.22 ds m-1 and gets a soil permeability value of 7,185 x 10-5 cm s-1. When the permeability value is small, the EC value will also be smaller so that the resulting porosity is also low. Keywords: Permeability, conductivity, porosity, peat soil PermaLink | Plain Format | Corresponding Author (Amalia Nurfitriani)

278	Physics	ABS-117
THE EFFECT OF TEMPERATURE TO CHANGE 3D ROCK STRUCTURE ON CAPROCK OF THE AREA OF GEOTHERMAL POTENTIAL IN KADIDIA - SIGI, CENTRAL SULAWESI Iqbal Assidiq UPI Abstract Kadidia-Sigi, Central Sulawesis geothermal potential area has impermeable hoods with a high level of clay minerals (illite) in alteration regions around geothermal manifestations. Breccia rock samples were taken from one of the wells that had been analyzed to see the effect of temperature on changes in 3D rock structure. Rock samples were given heat induction treatment with varying temperatures ranging from 24°C (room temperature), 100°C, 150°C, 200°C, to 250°C. Samples at room temperature that have been given treatment are scanned with a Micro-Computed Tomography Scan (µ-CT Scan) instrument. 300 images of the µ-CT Scan results were reconstructed and characterized by 3D changes in the pore structure, minerals, and fractures using digital image processing. The results obtained in the form of pore grain size distribution, mineral grain size distribution and porosity rock size {{(T)}, specific surface area {SsA (T)} which tends to increase polynomially in pore and mineral structures. The results of fracture are obtained in the form of the main parameters, namely aperture {e (T)}, density {? (T)}, and intensity {I (T)}. Changes in micro structure (Nfracture) which is the cause of changes in fractal properties in rock structures. Where fractal changes produce equations that show fractal dimensions as a function of temperature that occurs in the pore structure, minerals, and breccia rock fractures. Keywords: 3D rock structure, treatment of temperature, pore, minerals, fractures, fractal dimensions PermaLink | Plain Format | Corresponding Author (Iqbal Assidiq)

279	Physics	ABS-118
Determination Of Water Condition in Peat Soil Through Electrical Conductivity Value on Palm Oil Plantation Agriculture Area in West Kalimantan Region Aldi Rijaldi UPI Abstract Groundwater is a very important component in the hydrological cycle, and is a very important source and its existence is not affected by the evaporation process that occurs at the surface of the soil. Through measurement of the value of EC (Electrical Conductivity) using a conductivity meter by separating soil samples from a depth of 600 cm to 50 cm. Then measure the water content and C-Organic content by gravimetric method. Obtained parameter values such as EC values at depths of 0-400 cm (layer A) have a range of values of (0.2-0.11) dS m-1. Then at a depth of 401-550 cm (layer B) has a range of values of (0.04-0.13) dS m-1 and the last at a depth of 551-600 cm has a range of EC values of (0.7- 0.23) dS m-1. Then the C-Organic content values obtained for layer A are 37.50%, layer B 47.01% and layer C 6.85%. From the parameters measured namely the water content and C-Organic content have values that fluctuate based on the layer, but if the value of water content is high the value of C-Organic content will also be high. It can be said that the water content and C-Organic content are linear but inversely proportional to the EC value. Keywords: Peat soil, water content, organic content PermaLink | Plain Format | Corresponding Author (Aldi Rijaldi)

280	Physics	ABS-144
CHARACTERIZATION OF PEAT SOIL TEXTURE ON THE ALOE VERA LAND IN WEST KALIMANTAN Siti Inna Zainab (a*), Aldi Rijaldi(a), Amalia Nurfitriani(a), Dwi Putri Desti Utami(a), Gulistan Amalia Rahman(a), Mimin Iryanti(a), Ahmad Aminudin(a), Yuyu Rahmat Tayubi(a), Rossie Wiedya Nusantara(b). a) Departement of Physics Education, Indonesia University of Education Jalan Setiabudhi No.229, Isola, Bandung 40154, Indonesia *sitiinna85[at]gmail.com; mimin_iryanti[at]yahoo.com. b)Departement of Geology Tanjungpura University Jalan Prof. Hadari Nawawi, Pontianak 78124, Indonesia. Abstract The usage of peatland received great attention especially for the cultivation of plantation crops. Soil fertility is determined by the soil texture which had an ideal fraction composition. The texture can also be used as a criterion of land classification and land suitability. Aloe vera was one of the leading commodities in West Kalimantan which well grown in peatland rather than in another type of land. This research aimed to determine the texture characteristic of peat soil on the land of aloe vera in West Kalimantan. The research method used sieve analysis and hydrometer. These measurements were carried out at the TekMIRA Testing Laboratory. The sieve analysis test result can be classified as soil texture in which using the USDA (United States Department of Agriculture) gradation concept. According to the soil texture classification by using USDA, this research obtained the data of sand texture had an average sand portion of 96.54%, silt average of 2.65%, and clay average of 0.81%. The portion of sandy clay texture was 87.57% sand, 8.27% silt, and 4.16% clay. While the texture of clay soil had a proportion of sand 5.10%, silt 36.50%, and clay 58.20%. In sum, the characteristics of the peat soil texture on the aloe vera soil classified in the texture of sand, sandy clay, and clay. Keywords: Soil texture, Peat Soil, Aloe vera. PermaLink | Plain Format | Corresponding Author (Siti Inna Zainab)

281	Physics	ABS-149
UNIAXIAL MECHANICAL PRESSURE EFFECT TO THE PORE STRUCTURE DEFORMATION ON AN ALTERED BRECCIA ROCK Annisa Nadhira (a*), Iqbal Assidiq(a), Selly Feranie(a), Fourier Dzar Eljabbar Latief(b) a) Department of Physics Education, Indonesia University of Education Jalan Setiabudi No. 229 Bandung 40154, West Java, Indonesia *its.annisanadhira[at]gmail.com b) Physics of Complex Systems, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132, West Java, Indonesia Abstract Knowledge about the physical parameters of rocks is important in order to understand the properties associated with the fact that porous rocks are fluid storage media. The amount of the contained fluid can be estimated roughly by analyzing the pore fraction of rocks. To investigate the pore evolution, a series of uniaxial compression test was conducted on an altered breccia rock sample. The sample was obtained from a potential geothermal area at Kadidia-Sigi, Sulawesi Tengah. The uniaxial compression treatment started from the natural pressure 438,468 N/m2 then, 629,079 N/m2, 1,887,238 N/m2, 3,145,396 N/m2, 4,403,554 N/m2, and 5,032,633 N/m2. Digital image processing and analysis method were applied to record and analyze the deformation of pore and fracture structure. Qualitative analysis was conducted by investigating the produced 2D and 3D images, and it was shown that the pore intensity and the fractures intensity increases as the pressure increase. Quantitative analysis was conducted by investigating the porosity and specific surface area as a function of the applied pressure. It was found that porosity {ϕ(P)} is in the function of a positively second-degree polynomial and specific surface area {SA(P)} is in the function of a negative second-degree polynomial. Keywords: pore structure; uniaxial mechanical pressure; an altered breccia rock PermaLink | Plain Format | Corresponding Author (Annisa Nadhira)

282	Physics	ABS-167
Thermal Distribution Analysis of Heating System for Optimization of CO2 Gas Sensor Detection Dwi Putri Desti Utami (a*), Aldi Rijaldi (a), Amalia Nurfitriani (a), Gulistan Amalia Rahman (a), Siti Inna Zainab (a), Rossie Wiedya Nusantara (b), Yuyu Rahmat Tayubi (a), Ahmad Aminudin (a*), Mimin Iryanti (a*) a) Physics Study Program, Department of Physics Education, Faculty of Mathematics and Natural Science Education, Indonesia University of Education, Jalan Dr. Setiabudhi, No. 229, Bandung 40154, West Java, Indonesia *dwiputridu18[at]gmail.com; aaminudin[at]upi.edu; mimin_iryanti[at]yahoo.com b) Department of Soil Science, Faculty of Agriculture, Tanjungpura University, Jalan Prof. Hadari Nawawi, Pontianak 78124, West Kalimantan, Indonesia Abstract Soil takes a big role as a source of excess CO2 gas emissions that can be the cause of global warming, mainly peat soils that contain a lot of organic matter. One of the factors that influence is soil temperature. The research aims to analyze the temperature distribution at the surface of the soil to optimize the detection of CO2 gas sensor for soil by designing an appropriate heating system. The method used is an experimental method. Research using peat soil placed in the chamber, the heater was placed on it, and a number of thermometer-digitals are placed at several points on its surface in the x-axis and y-axis by plotted distance from the heater is 5cm, 10cm, and 15cm. Temperature alterations toward time can be observed by thermometer and stopwatch. The temperature distribution at the surface of soil occurs evenly in the radial direction, and further the distance of soil from the heater, the less its influence toward temperature alteration of soil. At plotted distance of 5cm, the temperature alteration toward time is 0.0019oC/s, at 10cm is 0.0004oC/s, and at 15cm is 0.0001oC/s. Based on it, the optimal distance used in the design of the heating system is 5cm and 10cm, and CO2 gas sensor successfully detected CO2 gas on it. This result can be used as supporting data in designing a heating system for portable CO2 concentration gauge for soil. Keywords: Temperature distribution; Temperature alteration; Peat soil PermaLink | Plain Format | Corresponding Author (Dwi Putri Desti Utami)

283	Physics	ABS-169
The Automatic Detection of Near-Earth Asteroids in Co-Orbital State with Terrestrial Planets by Implementing Motif Discovery Algorithm Judhistira Aria Utama (a*), Lala Septem Riza (b), Muhammad Naufal Fazanadi (b) a) Department of Physics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia *j.aria.utama[at]upi.edu b) Department of Computer Science Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia Abstract Orbital computation of 3,372 real near-Earth asteroids (NEAs) population was conducted and their orbital evolution was recorded every 1,000 years for the next 5 Megayears (Myr). This study is aimed to detect asteroids in 1:1 mean-motion resonance (MMR) with planets. In order to achieve our goal, we employed N-body numerical simulation with the use of Swift-RMVS (Regularized Mixed-Variable Symplectic) integrator. We found that NEAs population could have evolved into asteroids in a co-orbital state with Terrestrial planets (Mercury to Mars). For the detection of this co-orbital condition a time series of motif discovery algorithm known in computer science was applied to asteroids orbital elements. The predicted results of the experiments carried out were then compared with one of the standard tool in astronomy, which showed that our model could prove the location of the motif and the duration of the asteroid in co-orbital state with each Terrestrial planets. Keywords: Co-orbital state; Motif discovery; Near-earth asteroids; Orbital elements; Time series PermaLink | Plain Format | Corresponding Author (Judhistira Aria Utama)

284	Physics	ABS-185
Performace Test of Peristaltic Pump for Flow Fluid Measurement System Ahmad Aminudin, Fify Mapalita, Waslaludin Departemen Fisika, Universitas Pendidikan Indonesia Jl. Dr.Setiabudi No.229 Bandung, Jawa Barat Indonesia Abstract Peristaltic pump RPM counter using rotary encoder has been designed. Peristaltic pump is a pump which using flexible tube as a tool for transporting fluid due to the pressure roller on the rotor. The rate of fluid flow in the flexible tube is affected by the angular speed of the motor (ω) in RPM. There are many available peristaltic pumps with a various selection in the market but rarely equipped with RPM measurement system. In this research, the peristaltic pump used three rollers and a flexible tube with the inner radius (rd) 0.21cm. The two main part on the rotary encoder are encoder disk with an index of 36 and a sensor optocoupler chip. Output rotary encoder signal is processed in such a way on the microcontroller into the value of angular speed (ω) in RPM and the linear velocity (v) in cm / min. Then, the results of this calculation is displayed on the LCD. The operating voltage range of peristaltic pumps which can be used are 1.5 to 9.0 V. At this voltage range, the peristaltic pump produce angular speed in a range of 3.76-33.83 RPM. RPM counter system of the peristaltic pump which has been made could measure RPM well with a percentage of the average accuracy percentage of 99.51% and average error percentage of 0.49% of the value of RPM results of manual calculations. The volume flow rate which has been calculated was 8.9407 – 65.0959 ml/min and the volume flow rate which has been measured was 37.1518 – 66.5199 ml/min. Keywords: Performance Test, Peristaltic Pump, Flow Measurement, Encoder PermaLink | Plain Format | Corresponding Author (Ahmad Aminudin)

285	Physics	ABS-231
GOTO TELESCOPE MOTION CONTROL SYSTEM RIGHT ASCENSION AND DECLINATION DIRECTION WITH THREE MODES OF SPEED USING MICROCONTROLLER ATMEGA2560 Ilham Hidayat Kurniawan, Mochamad Irfan,M.Si , Dr. Ahmad Aminudin, M.Si Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Indonesia Observatorium Bosscha, Institut Teknologi Bandung, Indonesia Abstract A GOTO telescope motion control system in right ascension and declination direction with three modes of speed using microcontroller ATMega2560 has been made.. This research was pursed in a telescope motion control system that leads to right ascension and declination. The telescope used is one of the telescopes at Bosscha Observatory, the GOTO telescope. The current condition of the GOTO telescope has decreased. This is caused by the motion control system that was applied previously doesn’t work optimally. Therefore this research will discuss and create a new system for telescopes which will use the ATMega2560 microcontroller which is embedded in the Arduino Mega board as the brain of this system. The way this system works is first the ATmega2560 microcontroller will read the first position of the telescope after that the telescope will be moved by the handbox towards right ascension or declination and then the last position of the telescope will be read by the microcontroller. By using this latest system the servo motor in the GOTO telescope can move with three speed modes namely guide, set and slew where the speed of the guide requires a frequency of 1604 Hz, the speed of the set requires a frequency of 51.340 Hz and the slew speed requires a frequency of 501,368 KHz. Keywords: GOTO telescope, ATMega2560, control system, declination, right ascension PermaLink | Plain Format | Corresponding Author (Ilham Hidayat Kurniawan)

286	Physics	ABS-249
Effects of Applied M-Filter on the Indonesian Tsunami Early Warning Application (Ina-TEWA) Performance Madlazim, Tjipto Prastowo, Supardiyono Universitas Negeri Surabaya Abstract A reliable method of detecting tsunami generation in the ocean for effective tsunami early warning requires rapid and accurate tsunami-discriminant calculations, which include rupture duration (Tdur), the duration exceeds 50 seconds (T50ex), and the dominant period (Td) of first P-wave arrivals extracted from seismic signals induced by earthquakes of varying magnitudes. In this context, this study is thus aimed to analyze the effects of M-filter implemented on the existing Tsunami Early Warning Application (Ina-TEWA) performance in terms of accuracy in determining such discriminants. A method of real-time experiments was developed in this study, where tsunami parameters obtained before and after M-filter implementation were analyzed for the number of false warnings issued. A total of 300 Indonesian events striking regions throughout the country with a range of magnitudes from 5.0 to 7.9 during 2018-2019 years were examined. The results showed that prior to M-filter installation 15 of all cases considered were falsely issued, confirming for a total of 95% assessment being adequately accurate. However, accuracy in the Ina-TEWA performance was found to improve as false alerts reduce to zero when M-filter was introduced, implying a 100% level of accuracy. Hence, the use of M-filter in the Ina-TEWA makes its performance better, providing with reduction in false warnings and hence improved accuracy. Keywords: Keywords: M-filter, Ina-TEWA, improved accuracy, false warning, tsunami parameters PermaLink | Plain Format | Corresponding Author (Madlazim Madlazim)

287	Physics	ABS-252
Graphene/SiO2 Nanocomposite From Natural Material M Munasir(a,*); Mahdalisa Dayu (a) (a)Physics Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya Kampus Unesa-Ketintang, Jl. Ketintang, Surabaya, 60231 (*)munasir_physics[at]unesa.ac.id Abstract This work, reports on the results of research, fabrication of natural-based Graphene/SiO2 nanocomposites; graphene (GO) was prepared from coconut shells using the Hamers method and silica nanoparticles (SiO2) derived from Tetraethyl-orthosilicate precursors. Graphene/SiO2 nanocomposite fabrication using the one-pot process. The Crystal structure was analyzed using XRD, functional groups with FTIR and D-band and G-band that identified sp2 orbitals with Raman Spectroscopy. The analysis of adsorption properties of methylene blue dyes dissolved in water studied by UV-Vis spectroscopy. Graphene/SiO2 characteristics are obtained both in terms of structure and adsorption power of colours in the water, which is characterized by a trend of decreasing adsorption intensity on the UV-Vis curve. Keywords: graphene (GO); Fe3O4/rGO; nanoparticle PermaLink | Plain Format | Corresponding Author (M Munasir)

288	Physics Education	ABS-2
The Influence of STEM-Integrated Learning Cycle 7E on Students’ Creative Thinking Skills in The Topic of Temperature and Heat Parno (a*), Lia Yuliati (a), Edi Supriana (a), Ahmad Taufiq (a), Marlina binti Ali (b), Anula Ning Widarti (c), and Umi Azizah (c) (a) Physics Education, Universitas Negeri Malang, Jl.Semarang No.5, Malang 65145, Indonesia *parno.fmipa[at]um.ac.id (b) Department of Educational Science, Mathematics and Creative Multimedia, Faculty of Education, Universiti Teknologi Malaysia, 81310 Skudai Johor, Malaysia (c) Graduate School Universitas Negeri Malang, Jl.Semarang No.5, Malang 65145, Indonesia Abstract This research aims to study the influence of STEM-Integrated Learning Cycle 7E on students’ creative thinking skills in the topic of temperature and heat using a quasi experimental research with Pre- and Posttest Design. The research subject is 66 grade XI students of MAN II Batu Indonesia. They are distributed in the experiment (n=30) and the control (n=36) classes and received, respectively, STEM-Integrated Learning Cycle 7E, and Learning Cycle 7E models. The research instrument is students’ Creative Thinking Skills Test with 0.803 alpha Cronbach reliability. The data is analyzed using descriptive, t test, N-gain, and effect size. The result shows that the STEM approach can increase creative thinking skills as indicated by the significantly higher average skill score obtained by the experiment class. Beside that, both classes increase the skill from Almost Not Creative to Creative levels. Also, both classes increase it at a medium category. Furthermore, especially for fluency indicator, the experiment class obtains a high category. The practical implementation of STEM-Integrated Learning Cycle 7E model has a very large impact than Learning Cycle 7E class in increasing the students’ creative thinking skills. The experiment class students give higher positive response than control class for learning process. Keywords: STEM, Learning Cycle 7E, Creative Thinking Skills, Temperature and Heat PermaLink | Plain Format | Corresponding Author (Parno Parno)

289	Physics Education	ABS-258
THE IMPACT OF MODEL BASED LEARNING (MBL) IN IMPROVING STUDENTS’ UNDERSTANDING IN HEAT AND HEAT TRANSFER CONCEPT MUTIA HARIZA LUBIS(a*), IKA MUSTIKA SARI (b), PARLINDUNGAN SINAGA (b) a) Department of Physics Education, Faculty of Mathematics and Natural Sciences Education, Universitas Pendidikan Indonesia *) mutia.hariza[at]student.upi.edu b)Department of Physics Education, Faculty of Mathematics and Natural Sciences Education, Universitas Pendidikan Indonesia Abstract Heat and their transferred contain abstract concepts that are difficult for students to understand. This is a factor in the lack of students understanding concepts, even a factor in misconceptions. Therefore, efforts are needed to improve the students’ understanding concepts and minimize misconceptions. One of them is the learning model which presents a scientific model as an illustration of an abstract concept and facilitates students to reconstruct their own model. The learning model is known as the Model Based Learning (MBL). This study aims to see an increase students understanding concept in the heat and their transferred after the application of Model Based Learning (MBL). This study uses Pre-Experimental Design with the One Group Pretest-Posttest Design method. The sample in this study consisted of 34 class X students of one of the state high schools in Bungo Regency, Jambi Province, taken by convenience sampling. The instruments used were 18 multiple choice questions that measure students understanding concepts. The results showed that there was an increase in students understanding concepts in the heat and their transferred which was included in the medium category after the application of Model Based Learning (MBL). Keywords: Model Based Learning (MBL); Students’ Understanding Concepts PermaLink | Plain Format | Corresponding Author (MUTIA LUBIS LUBIS)

290	Physics Education	ABS-259
The Development of Model Based Learning in Introductory Physics: The effectiveness in improving Students Understanding in Heat and Heat Transfer Ika Mustika Sari, Saeful Karim, Mutia Hariza, Duden Saepuzaman Department of Physics Education, Science and Math Education Faculty, Universitas Pendidikan Indonesia Abstract Heat and heat transfer is still becoming a difficult concept to students due to its characteristic as an abstract concept. This fact leads students to have misconception in the topic. Introductory Physics as a mandatory subject to Pre-service Physics Teacher has an important role in constructing and developing studentss scientific concept. Model based learning (MBL) was developed and has been implementing in this course. Design based research as a research method, was used in examining the effectiveness of MBL. Results show that MBL has an impact in improving students understanding in heat and heat transfer. Both the effect size and normalised gain showed the positive increase in medium category. Keywords: Model based learning, heat, heat transfer, introductory physics PermaLink | Plain Format | Corresponding Author (Ika Mustika Sari)

291	Physics Education	ABS-262
Re-Design of Physics Learning Chapter Optical Instruments to Train Scientific Literacy (SL) through Marzano’s Learning Dimensions (MLD) and Reading Infusion Strategies. S Utari, A N Mufid, S Karim, D Saepuzaman, E C Prima, M G Nugraha Departement of Physics Education Indonesia University of Education Abstract This re-design of physics learning chapter optical instruments for senior high school level is designed based on the analysis of students responses to the competency domain of scientific literacy, the aspects of this domain are explaining scientific phenomena (K1), evaluating and designing scientific research (K2) and interpreting data and scientific evidence (K3). The results of the study from the samples showed indications of difficulties in the domain of competence in aspects K2 and K3 so that competency could not be achieved properly. The Marzano’s Learning Dimension (MLD) can build positive attitudes and perspectives both in the formation, refinement, and application of knowledge to produce Habits of Mind (productive thinking habits). In order for better learning interaction process, students need to be given sufficient knowledge through the use of reading infusion strategies. In order to practice scientific literacy competencies, it is necessary to build an investigation through contextual experimental activities, therefore in this optical instrument chapter, several experiments are built which are about determining the strength of eyeglass lenses, making simple projectors and making simple microscope designs. Keywords: Scientific Literacy Competency, Marzano’s Learning Dimension, Reading Infusion Strategy, Optical Instruments. PermaLink | Plain Format | Corresponding Author (Athif Naufal Mufid)

292	Physics Education	ABS-263
Didactic Design Based on Student Responses to Practice Scientific Literacy with Using Marzano Learning Dimensions and Reading Infusion on Momentum Content Setiya Utari,Rattila Arinal Haque,Saeful Karim, Duden Saepuzaman,Muhamad Gina Nugraha,Eka Cahya Prima Department of Physics Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, Indonesia. Abstract Abstract. This didactic was designed based on the results of students responses to scientific literacy (SL) competencies. Some of the student’s low responses related to the competencies of explaining scientific phenomena in aspects of building hypotheses,competencies in evaluating and designing the research results on aspects of exploring inquiry questions and competencies of interpreting data and evidence scientifically on the aspects of analyzing and interpreting data and drawing right conclucion. Marzanos learning dimension has five dimensions that are closely related to training scientific literacy (SL) competencies and the reading infusion is chosen so that students have supporting knowledge for the learning process. Didactic design focused on studying momentum related to determining the velocity of the center of the particle system, in order to prove the validity of momentum conservation law, and the relation between rocket speed and emitted gas. The experiment has been tested in the laboratory so it is possible to build tasks and right didactics design, so that students have a positive perception in facilitating scientific literacy (SL) competencies. Keywords: Keywords: Scientific literacy competency,dimensions of Marzano learning and reading infusion. PermaLink | Plain Format | Corresponding Author (Rattila Arinal Haque)

293	Physics Education	ABS-12
Using the rasch model to validate electricity and magnetism achievement test items Rahmawati (a,b*), N Y Rustaman (b), I Hamidah (b), D Rusdiana (b) a) Program Studi Pendidikan Fisika, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Muhammadiyah Makassar, Jl. Sultan Alauddin No. 259, Makassar 90222, Indonesia b) Program Studi Pendidikan IPA, Sekolah Pascasarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract One of the ways that can be used to validate test items is by Rasch Model application. Validation aspects used in this research consist five aspects, such as (1) item measure, (2) item fit, (3) differential items, (4) person measure, and (5) person fit. The test was given in the form of multiple choice as many as 40 items consisting of 23 items about electricity and 17 items about magnetism. The participants were 60 physics students who were given 60 minutes to do the test. Items was analyzed using WINSTEPS version 3.68.2. The results showed that the test items are valid. Reliability alpha of items is 0.90. It means that the quality of test items is very good. Keywords: Validation, Rasch Model, Electricity and Magnetism Achievement Test PermaLink | Plain Format | Corresponding Author (Rahmawati -)

294	Physics Education	ABS-13
Development of E-Learning on Thermodynamics Subject to Increase Analytical Skill of Students Vina Serevina, Raihanati and Virgiana Tinura State University of Jakarta Abstract This research aims to develop E-learning on thermodynamics subject to increase analytical skill of students. E-learning can be accessed via computer or smartphone. Thermodynamics is a subject which learned the relationship between heat and work also properties that support those relationship. This research method used ADDIE method: Analyze, Design, Development, Implementation, and Evaluation. Research was conducted in Laboratory of Media State University of Jakarta for six months, from October 2018 to April 2019 with physics education students of State University of Jakarta as object of research. Students analitycal skill improvement test was conducted by pre-test and post-test in two classes (class A and class B). Analytical skill is an ability to identify, separate, and distinguish components or elements of a fact, concept, opinion, assumption, conclusion and to check every components to see whether there is a contradiction. Material expert validation results show 91,28%,media expert validation 91,11%,learning expert 91,85%. N-gain test show a score 0,67 (medium category) for class A and 0,5 (medium category) for class B. Conclusion of this research is developed E-learning can increase Analytical Skill of Students. Keywords: Development of E-Learning, Thermodynamics, Analytical Skill PermaLink | Plain Format | Corresponding Author (Vina Serevina)

295	Physics Education	ABS-14
Application of a Guided Inquiry Model to Improve the Learning Outcomes of Class XI Physics Students Vina Serevina, Nada Yolanda and Virgiana Tinura State University of Jakarta Abstract This study aimed to determine the application of guided inquiry learning models to improve student learning outcomes at class XI Mathematics and Natural Sciences 2, in 42 Public High School, Jakadrta. The research method used classroom action research. This research was conducted in two cycles, where each cycle consisted of planning, implementation, observation, and reflection. The minimum completeness criteria (KKM) indicators of learning outcomes that must be achieved are 70 with affective, cognitive, and psychomotor domains. The results showed that the average score increased in all three domains. The results of this study indicate that the average score of student learning outcomes in the affective domain of the first cycle is 68.73%, the cognitive domain of the first cycle is 60.33%, and the psychomotor domain of the first cycle is 70.17%. While the average score of affective domain student learning outcomes from the second cycle 72.33%, the cognitive domain of the second cycle 78.23%, and the psychomotor domain of the second cycle 76.61%. Based on these results, it can be concluded that the application of a guided inquiry learning model can improve student learning outcomes. Keywords: guided inquiry learning model, learning outcomes PermaLink | Plain Format | Corresponding Author (Vina Serevina)

296	Physics Education	ABS-274
Redesign Physiscs Learning Based on Students Response To Train Scientific Literacy (SL) Using The Marzano’s Learning Dimension and Reading Infusion On Sound Wave Chapter Saeful Karim, Muhammad Alimahdi, Setiya Utari, Duden Saepuzaman, Muhamad Gina Nugraha, Eka Cahya Prima Indonesia University Of Education Abstract This didactic redesign apply strategy reading infusion (SRI) and using Marzano’s Learning Dimension (MLD) is based on student responses to literacy scientific competencies (LS) which is indicate that students still weak related to aspects of evaluate and design (K2) and interpreting data and scientific evidence (K3) on sound wave chapter. To train this competence learning develop experimental topic that is contextual like experiment of analyzing sound wave damping material, determine standard tuning on the guitar, and calculate velocity of sound wave with doppler effect through the use of smartphones, the experiments that were presented is designed to facilitate scientific literacy competence and reading infusion is used to insert knowledge so that the students have enough knowledge, this is as able to develop attitudes and positive perspectives and productive thought process during knowledge formation, refinement of knowledge and application of knowledge. Keywords: Literacy scientific competence, Marzano,s learning dimension, and reading infusion PermaLink | Plain Format | Corresponding Author (Muhammad Alimahdi)

297	Physics Education	ABS-275
Development and Validation of Critical Thinking Skills Instruments of Physics Subjects Khaeruddin (a), Bunga Dara Amin (a) a) Department of Physics Education, Faculty of Math. and Natural Science, Universitas Negeri Makassar, Indonesia Abstract The Indonesian curriculum explicitly states that critical thinking skills as Higher Order Thinking Skills (HOTS) and future competencies must be taught to students to answer the challenges of globalization and be able to adapt to changes and respond to the demands of the 21st century. Therefore, this paper explains the development and validation of instruments of critical thinking skills to assess the ability to interpret, the ability to analyze and the ability to infer students. Specifically, critical thinking skills tests are designed based on the basic competencies of senior high school physics subjects in the form of essays that are equipped with an assessment rubric. Evidence of content validity, construct validity, and reliability is presented as the reliability of the critical thinking test instrument. Keywords: Critical thinking skills, instrument development, validation. PermaLink | Plain Format | Corresponding Author (Khaeruddin Khaeruddin)

298	Physics Education	ABS-22
Pedagogical Content Knowledge Ability of Pre-service Physics Teachers in Reflecting Project Based Learning on Physics Concepts S Efwinda (a*) dan MN Mannan (b) a) Physics Education, Faculty of Teachers Training and Education, Universitas Mulawarman, Jl.Muara Pahu Kampus Gunung Kelua, Samarinda 75123, Indonesia *shelly.efwindaa[at]gmail.com b) Science Education, School of Postgraduate Studies of Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No.229, Bandung 40154, Indonesia Abstract Pedagogical Content Knowledge (PCK) is the ability to teach a content on a particular concept so students can master the concept correctly. One characteristic of qualified teacher is having excellent PCK ability. The purpose of this study is to obtain an PCK ability profile of prospective physics teachers in reflecting project-based learning (PjBL) that had been carried out. This research is a qualitative research with narrative research design. The data collection instrument in this study is Pedagogical and Professional-experience Repertoires (PaP-eRs). The subjects in this study are 13 physics students (prospective teachers) in one of State University of East Kalimantan. The results shows that the average value of PCK ability of prospective physics teachers in reflecting PjBL is 50% in sufficient category. Based on the results of study, academics or stakeholders need to add adequate facilities as a means for students to practice teaching, develop teaching materials, and master the concept of physics better. Keywords: Pedagogical Content Knowledge (PCK); Project based Learning (PjBL); Professional-experience Repertoires (PaP-eRs) PermaLink | Plain Format | Corresponding Author (Shelly Efwinda)

299	Physics Education	ABS-278
Physics Textbook Enriched Augmented Reality: Easy Way to Understand The Physical Concept Dewi Muliyati, Diniar Hikayah Baiti, Fauzi Bakri, Handjoko Permana Physics Education Department, Universitas Negeri Jakarta Abstract This study aims to produce a physics textbook enriched Augmented Reality. The book that has been produced can be used as a technology-based source of learning for high school students 10th grade 1st semester. The book is presented in multi-representation in the form of pictures, tables, graphics, exposure, sample problems, 3D animation, and video. 3D animations or videos are displayed through Augmented Reality application with android operating system. The research was conducted by research and development method of Dick and Carey model. Instruments used in the form of Likert scale questionnaire. The research data were obtained from material experts, media experts, physics teachers, and high school students 10th grade then analyzed using a Likert scale and gain test. The results of validation by material experts get a value of 88,16% for the nature of physics and measurement; 94,06% for vectors; 94,96% for linear motion kinematics; 88,5% for two-dimensional motion (parabolic motion); and 88,76% for circular motion. The results of validation by instructional media expert get a value of 88,17%. User trials by teachers get a value of 92,86% and by students get a value of 90% and an increase in the cognitive abilities of high school students 10th with a value of 0,35. It can be concluded that this physics textbook enriched with augmented reality technology is worthy of being used as a learning source in physics learning. Keywords: textbook, augmented reality, physics PermaLink | Plain Format | Corresponding Author (Dewi Muliyati)

300	Physics Education	ABS-279
QR-Code Assisted Learning Book: Scientific-Based Physical Learning Solution Fauzi Bakri, Sarah Salsabila, Dewi Muliyati Physics Education Department, Universitas Negeri Jakarta Abstract Understanding physics concept will be easier if the material can be presented in various forms. Quick Response Code (QR–Code) can provide additional material in the form of videos, PPTs, or website to facilitate the learning of physics concept. The methods used in this study is research development (Research and Development), Dick and Carey model with the following steps: identify instructional goals, conduct instructional analysis, identify entry behaviors and learner characteristics, write performance objectives, develop criterion-referenced test items, develop instructional strategy, develop and select instructional materials, develop and conduct formative evaluation, revise instruction, develop and conduct summative evaluation. This study produced textbooks equipped with QR–Code for 12th-grade physics in the odd semester to display physics the materials enriched with various forms of media making it easier for students to understand the concepts learned. Keywords: Textbook, Research and Development, QR code, High School Physics PermaLink | Plain Format | Corresponding Author (Dewi Muliyati)

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