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361	Mathematics Education	ABS-494
Analysis of Metacognition Ability in Mathematics Problem Solving for Junior High School Students Devita Anjarwati (a*), Riska Nur Aini (a) Faculty of Mathematics and Natural Sciences Education, Indonesian University of Education Abstract Metacognitive ability is an individual^s ability to be aware of the process and results of his thinking (cognition) as well as his ability to evaluate the process of cognition which includes the ability to plan (planning), monitor (monitoring), and evaluate (evaluating) the process and results of his thinking. A person^s mathematical ability will affect his thought process in problem solving. Based on the results of interviews, some students do not have good metacognitive abilities due to a lack of self-awareness in the thinking process, so they have not been able to know the shortcomings and strengths of their ability to solve problems. Furthermore, students also said that they had difficulty in learning mathematics so that they were not interested in learning mathematics. This study aims to describe students^ metacognitive abilities in solving mathematical problems in class VIII MTsN 2 Padang. This research is descriptive research with a quantitative approach. Sampling was based on the purposive sampling technique. The research instrument used was a metacognitive ability questionnaire and interviews. The stages of data analysis used include data reduction, data exposure, and conclusions. The results showed that the metacognitive ability of grade VIII MTsN 2 Padang students in solving mathematical problems as a whole were in the high category. Where the elements of developing planning are in high qualifications with an average of 65.3% of students involving this ability in problem solving, elements of conducting monitoring in high qualifications with an average of 69.85%, and elements of evaluating planning in low qualifications with an average of 26.5% of students involve this ability in solving mathematical problems. Keywords: Metacognition Ability- Problem solving Share Link | Plain Format | Corresponding Author (Devita Anjarwati)

362	Mathematics Education	ABS-501
Metacognitive Self-Management in Developing Student^s Rigorous Mathematical Thinking Skills S Asnawati1 *, S Firmasari2 1,2Program Studi Pendidikan Matematika, Universitas Swadaya Gunung Jati, Jl. Perjuangan No. 01, Cirebon 45132, Indonesia Abstract This study aims to describe the metacognitive self-management of students in developing rigorous mathematical thinking. This study uses a qualitative method with a case study approach. The subjects were three students from the third level mathematics education department selected and contracted Real Analysis lectures. The first subject experienced a significant change from the beginning of the meeting, resulting in the metacognitive self-management process being well-conditioned. He completed the task more confidently than the initial presentation, used several references and sources of information to complete the job, and better represented each answer in mathematical symbols. In the first subject, the cognitive function that appears is level-1 with qualitative thinking. For the 2nd subject, there is also a change in the learning process and the teacher^s motivation and guidance. The results of the interviews showed that students applied strategies in completing assignments. They answered them systematically, based on experience, and mastered the prerequisite material. Students show improved thinking skills related to mastery of concepts from new material, analyze the problems given, are critical and focus when answering, and look hard to get maximum evaluation results. This 2nd subject enters the level of quantitative thinking with precision. While the 3rd subject, self-management, seems stable, but it still seems lacking in adjusting the understanding of prerequisites with understanding concepts from new material. The development during the learning process shows that he can activate his mathematical knowledge, compose logical proofs of Real Analysis material problems, and build relationships between prerequisite concepts and new material. This type of student enters the level of abstract relational. Keywords: Metacognitive Self-Management, Rigorous Mathematical Thinking Share Link | Plain Format | Corresponding Author (Sri Asnawati)

363	Mathematics Education	ABS-248
Learning Obstacles in Solving Non-routine Problems of System of Linear Equation in Two Variables Ayu Dini Farhana (a*), Sufyani Prabawanto (a**), Kusnandi (a***) a) Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia *ayu.dfarhana[at]upi.edu *sufyani[at]upi.edu *kusnandi[at]upi.edu Abstract Student competency in solving non-routine problem is very important. In the other hand, some students have obstacles in solving the problem, especially in the topic of system of linear equation in two variables (SLTEV). This purpose of this research is to identify learning obstacle by students in solving non-routine problems of SLTEV. The subjects of this study were five students of 8th grade in a Junior High School in Jakarta. The method of this research was qualitative with case study research design. The data was collected by using test of non-routine problems test and interview guideline. The non-routine problem of SLETV test consists of three questions. The interview was conducted by asking related questions about solving the problems. This research was not held in offline situation because of pandemic, so the ontogeny obstacle could not be observed. The data was analyzed in depth to identify the learning obstacle. The research results are there two learning obstacles, which are epistemological and didactical obstacles. The epistemological obstacle that found is students get confused in formulating or transcribing non-routine problems. The didactical obstacle that found is the sources of learning in the school just have few examples of non-routine problems. Keywords: Learning obstacles, Non-routine problems, SLTEV. Share Link | Plain Format | Corresponding Author (Ayu Dini Farhana)

364	Mathematics Education	ABS-509
A Hermeneutic Phenomenological Study of Learning Obstacles on Combinatorics Rita Kusumawardani (a*), Didi Suryadi (b), Kusnandi (b) a) Department of Mathematics Education, Postgraduate School, Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia *rita_kusumawardani[at]yahoo.com b) Department of Mathematics Education, Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia Abstract Combinatorics is an important concept in Curriculum of Mathematics Education Department. Nevertheless, many students find some difficulties to learn combinatorics concept. This study aims to analyze the learning obstacles that cause the difficulties. This uses a qualitative method with hermeneutic phenomenological approach. This involves 26 students of Mathematics Education Department in Indraprasta PGRI University as research subjects that are selected by purposive sampling technique. The data are collected by test and interview then analyzed descriptively. Triangulation is used to verify the data validity. Generally, the results show that students have learning obstacles in combinatorics. The learning obstacles involve ontogenic obstacles, epistemological obstacles, and didactical obstacles. Keywords: Learning Obstacle- Hermeneutic Phenomenology- Combinatorics Share Link | Plain Format | Corresponding Author (Rita Kusumawardani)

365	Mathematics Education	ABS-510
Challenges of Teaching and Assessment Methods for Online Mathematics Learning in the Pandemic Era Maria Zefanya Sampe Business Mathematics Program, School of Applied STEM, Universitas Prasetiya Mulya, Jalan BSD Raya Utama, BSD City, Tangerang 15339, Indonesia Abstract The focus of this research is to develop strategies to determine effective methods that can be applied in online mathematics learning and assessment during Covid-19 pandemic era. Various teaching challenges through distance education require lecturers to be able to use an e-learning platform as a means of online learning and assessment. This study uses a literature study method using several previous studies related to this topic. Based on the results of this study, there are some strategies and online mathematics assessments expected to be suitable for assessing students^ ability to identify complex problems by means of critical thinking to solve mathematical problems. The importance of interactive, creative, and innovative learning is an important indicator in the mathematics learning process in accordance with the current pandemic conditions. Keywords: mathematics, pandemic era, Covid-19, online learning, assessment, mathematical problem solving skills Share Link | Plain Format | Corresponding Author (Maria Zefanya Sampe)

366	Physics	ABS-269
The Signature of The Quadratic Generalized Uncertainty Principle on The Newtonian Gravity and Galaxy Mass Profile Feri Apryandi(a*), Idrus Husin Belfaqih(b), Anto Sulaksono(a) a)Department of Physics, Faculty of Mathematics and Natural Sciences, University of Indonesia, Depok 16424, Indonesia *feri.apryandi[at]ui.ac.id b)IoT and Physics Lab, Sampoerna University, Jakarta 12780, Indonesia Abstract In this study, we discuss the corrections implies by the presence of the general uncertainty principle (GUP) on Newton^s law of gravity by virtue of Verlinde^s proposal. We argue here that GUP leads to twofold modification, namely on the equipartition theorem and the holographic relation (Bekenstein-Hawking formula). Hence, following Verlinde^s proposal, we obtain quantum corrections term to the Newtonian gravity. In addition, we also report the quantum corrected mass profile of the galaxy. We restricted our derivation to first order in the GUP^s free parameter and compared it analytically with the other relevant works. Keywords: Generalized Uncertainty Principle (GUP)- Minimal Length- Entropic gravity Share Link | Plain Format | Corresponding Author (Feri Apryandi)

367	Physics	ABS-275
The development of the application of centrifugal force on the geometric design of the road for driving comfort Juang Akbardin, Qaedi Zulfahmi, Khilyatul Khoriyah, Asep Y Permana, Achmad Samsudin Department of Civil Engineering, Universitas Pendidikan Indonesia Department of Civil Engineering, Universitas Pendidikan Indonesia Education and Culture Office of Central Java Province Department of Architecture of Universitas Pendidikan Indonesia Department of Physic Education of Universitas Pendidikan Indonesia Abstract The development of inter-city road infrastructure development in Indonesia has already increased sharply along with economic growth and regional development. The geometrical design of the road has already been designed by the standard provisions and needs of the functions of the road services built. The application of physics concept in designing geometrical platform as a function in applying theoretical physics to the standardized-geometrical design. A centrifugal force in the physics concept is a basic principle in designing geometric horizontal alignments of the road. Conceptual understanding of engineering students in term of designing geometrical design perspective, has been based on the implementation of centrifugal force in the case of work on vehicles ride in the road bends. The implementation has ever been based on variables which were determined by understanding to apply logic of thinking constructively. The variables are determining the students^ conceptual understanding on the parameters of the centrifugal force equation which is working on the bend. The analytical method which is regarded on the categories of parameter functions used, is the approach of implementing centrifugal force. Civil engineering students^ conceptual understanding on geometrical designs through the implementation of centrifugal forces are able to increase the ability of analyzing process on the functions of comfort and driving safety. These procedures are collocating with reducing the effect of greater centrifugal force. Moreover, the application is also able to reduce accident-prone areas due to the influence of magnitude-centrifugal forces on the geometrical design of the road Keywords: Centrifugal Force, Geometrical design, Driving Comfort Share Link | Plain Format | Corresponding Author (JUang Akbardin)

368	Physics	ABS-276
Estimation of Wave Propagation in West Bandung Regency A M Sari1*, A Fakhrurrozi1, D Sarah1, B Setiadi1, M R Daryono1, A J Syahbana1,2, R A Bakar3, and J C Lee4 1Pusat Penelitian Geoteknologi, Lembaga Ilmu Pengetahuan Indonesia LIPI, Bandung, Indonesia 2Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung ITB, Bandung, Indonesia 3Universiti Kebangsaan Malaysia UKM, Kuala Lumpur, Malaysia 4Institute of Earth Science, Academia Sinica, Taipei, Taiwan Abstract Bandung Basin is one of the areas in West Java that is surrounded by active earthquake sources, which are the Lembang fault and the Cimandiri fault. The existence of these faults is now a concern, especially in West Bandung Regency, where development is starting to grow rapidly, i.e. the construction of tourist objects, housing clusters and government office buildings. Due to these conditions, the government began to consider the influence of these earthquake sources based on the geological conditions of the development area. This study analyzed the effect of wave propagation from the seismic ground motion to the surface ground. The method used is the non-linear earthquake response analysis method based on soil profile. The research located on West Bandung regency, which is spread over 14 CPTu points. The analysis results showed that the maximum value of surface PGA is on the Tanjung Jaya area, about 0.70g at the CPTu 04 point, while the lowest value is on Sindangkerta area, around 0.45g at the CPTu 05 point. The results of this analysis then visualized on a microzonation map. Furthermore, the results of this study can be used as a reference for calculating seismic risk to support disaster risk reduction programs. Keywords: Wave Propagation, Seismic Hazard, Ground Motion, Soil Profile, Bandung Barat Regency Share Link | Plain Format | Corresponding Author (Anggun Mayang Sari)

369	Physics	ABS-282
Design and Build Smartphone-Based Object Balance Applications W Setya, K Abdullah, and T S Putri Department of Physics Education, Universitas Islam Negeri Sunan Gunung Djati Bandung, Jl. AH. Nasution 105, Bandung 40614, West Java, Indonesia. Abstract The transformation of Technology and Information today is very fast. This progress makes it easy to be able to make a media. The concepts of physics that are known to be very abstract and difficult can be easily understood by providing a visual representation using a smartphone so that it can be learned anywhere and anytime. The research aims to design a media to make it easier to understand the concept of equilibrium of rigid bodies. The research method used is descriptive analysis method with observation techniques. The results of this study are in the form of media containing material, videos, simulations, examples of problem solving, and evaluations that are designed in such a way as to attract users in understanding the concept of equilibrium of rigid bodies. Based on this, students can explore knowledge broadly with the app offered, not just reading. Facilitating the teacher in facilitating learning is also the result of an easy evaluation. Keywords: learning Media, Object Balance, physic, Smartphone Share Link | Plain Format | Corresponding Author (WINDA SETYA)

370	Physics	ABS-283
Effect of Color Variations (Background and Letters) on Current Sources in Running Text P.10 Full Color W Setya, A Novia, D N Fariha, and M F Rizaldi. Department of Physics Education, Universitas Islam Negeri Sunan Gunung Djati Bandung, Jl. AH. Nasution 105, Bandung 40614, West Java, Indonesia. Abstract The depelopment and advancement of technology are increasing rapidly, especially in the electronics field to convey information. Running text boards are one of the technologies that are considered efficient to attract the attention of the public in conveying information in public places. The purpose of this study was to determine how the influence of current sources on variations in bacground color and font color variations in running text P.10 full color. This research was conducted by varying 6 color (bacground and letter writing) on the flow. Based on the data obtained, it shows that the color combination shows the number of different currents. The highest current is generated by a white background, especially yellow writing of 4.4 amperes and the lowest current by a black background, especially blue writing of 0.44 amperes. Keywords: Current, physic, Running Text Share Link | Plain Format | Corresponding Author (WINDA SETYA)

371	Physics	ABS-546
The Optimization of Koch Fractal Micromixer with Snowflakes Structure Devi Fitria Nurvadila1, Roer Eka Pawinanto2, Budi Mulyanti2, Ahmad Aminuddin1, Chandra Wulandari1,3, Lilik Hasanah1* 1Departement of Physics Education, Universitas Pendidikan Indonesia, Bandung 40154, Jawa Barat, Indonesia 2Departement of Electrical Engineering Education, Universitas Pendidikan Indonesia, Bandung 40154, Jawa Barat, Indonesia 3Engineering Physics, Institut Teknologi Bandung, Bandung 40132, Jawa Barat, Indonesia Abstract The development of micromixer device has grown rapidly due to significance in miniaturization of complex biological and chemical processing system. High mixing efficiency and low Reynolds (Re) number is a key performance expected from a micromixer device in microfluidic system. The performance could be enhanced by the complex structure of Koch fractal arranged at the top and bottom of the T-micromixer. In this work, the mixing efficiency of different level on Koch snowflake fractal are compared and the thickness of Koch fractal are optimized. COMSOL Multiphysics has been used to simulate the mixing process in microchannel and obtain the value of mixing efficiency for each geometries with thickness variations 0.01-0.19 mm. The influences of Re number on mixing efficiency was investigated in the range 0.05 - 100. The result has been indicated the higher level of fractal obtained better mixing efficiency. The homogenous mixing in the meander structure has showed as well as high mixing efficiency that reaches 0.99. The thickness linearly influences mixing efficiency, where the optimum performance obtained by 0.19 mm of thickness and Re 0.1. Therefore, it can be stated that the reported meander structure has a high performance and applicable to support the development of Lab on Chip for various application. Keywords: microfluidic mixer, Koch snowflakes fractal, mixing efficiency, Reynolds number Share Link | Plain Format | Corresponding Author (Lilik Hasanah)

372	Physics	ABS-548
Effects of Milling Time and 0.1% Y2O3 Additions on Sandvik Sanergy High Temperature (SSHT) Qolby Sabrina*, Nurhalis Majid , Ahmad Afandi Research Centre for Physics, Indonesian Institute of Sciences, Kawasan Puspiptek Serpong Tangerang Selatan, 15314, Banten INDONESIA Abstract Improving oxidation resistance and enhancing mechanical properties of interconnect materials for Solid Oxide Fuel Cell (SOFC) has been becoming major investigation recently. One special material developed for interconnect is sandvik sanergy high temperature (SSHT) which contains major elements of Fe, Cr, Ti, Ni, Mn. To improve oxidation resistance 0.1% of Y2O3 was added, and finally mechanical alloying was performed to refine the grain size. It has been well accepted that the finer grains will improve mechanical properties of materials, thus high energy milling (HEM) was employed with different time milling from 4, 8, and 16 hr. HEM was set 30 Hz constant, using ball milling, and the vial made of alumina with constant ball to powder ratio of 10:1. The pure SSHT powder, and the milled powders were further analysis with X-Ray Diffraction, Rigaku Smartlab operated at 30 mA, and 40 kV, using 0.02o step, and scanning speed of 4o/min. The line profile analysis was conducted to analyze the evolution of lattice parameters, micro strains, and crystallite size using Williamson-Halls and Scherer method. The microstructure morphology of milled SSHT was analyzed using Scanning Electron Microscopy (SEM) Hitachi SU3500. The particle size of the milled SSHT was further investigated using imageJ software, the result was compared and discussed with crystallite size measured by XRD. Keywords: SSHT, Yttria, YTiO3, crystal size, lattice strain, morphology material Share Link | Plain Format | Corresponding Author (Qolby Sabrina)

373	Physics	ABS-109
Graphical analyzer for misconception of angle 45° as optimal angle of parabolic motion R D Agustina*, W Setya, A Malik, R P Putra, S Andhika, A N Fitriani, and Y Cesariyanti Department of Physics Education UIN Sunan Gunung Djati Bandung Jl.A.H.Nasution No.105 Cibiru, Bandung 40614, Indonesia Abstract Misconceptions still often occur when learning physics, especially in conducting a study that is not consistently detailed in identifying an observation. In the material of parabolic motion, it is known that is the special angle that produces the farthest distance. The misconception that 45 ° is the angle that produces the farthest distance has become a reference in learning in various educational institutions to this day. The aim of this research is to identify and prove that the 45 ° angle is not the elevation angle which results in the farthest distance in a vacuum which ignores the initial position of the thrower. The method used is Data analytics, and compared based on Graphics Analytics using PhET virtual laboratory media. This study will test an elevation angle of 42°, 45°, 48° based on a height of 0 m, 1 m, 2 m. The results of the research will be analyzed based on the functional analyzer approach which is made from equations into function graphs to make it easier for readers to read the data. In this research, it is found that is the farthest distance producer and also gets a travel time that is relatively faster than the angle which we know so far as the special angle that produces the farthest distance in non-vacuum conditions. In this study, it is hoped that the readers will be able to reexamine the earning angle of the furthest distance which is still a misconception in various educational institutions. Keywords: Misconception- parabolic motion- virtual laboratory, Share Link | Plain Format | Corresponding Author (Rena Denya Agustina)

374	Physics	ABS-116
Application LTD Device to detect Laminar and Turbulance on plane wing prototype Riki Purnama Putra(a)*, Rizki Hidayatulloh(a), Rena Denya Agustina(a), Herni Yuniarti Suhendi(a), Reginald Rasyid(a) 1Program Studi pendidikan Fisika, Fakultas Tarbiyah dan Keguruan, UIN Sunan Gunung Djati Bandung. Kampus 2 UIN Sunan Gunung Djati Bandung, Panyileukan, Jl. Cimencrang, Kec. Gedebage. Kota Bandung, Jawa Barat, 40292. Indonesia Abstract A turbulence often occur during a plane^s flight especially on the wing^s part. This matter is influenced by several factors, for example the air density, altitude and air pressure. Furthermore, the wing^s shape will influence factors mentioned above. In this experiment we used different shaped plane wing prototypes that will be tested using X device. This experiment will indicate the air output whether it was laminar or turbulence. Moreover, we will look at how much the laminar and turbulence has on the effectiveness of the plane wing being tested. The purpose of this research is to know how much influence a plane wing^s shape has on the occurred turbulence, furthermore identifying which wing causes the most minimum turbulence. We used 3 different plane wing model, which are A model, B model, and C model with each model has different extent of area. Our results indicate that device X is able to show the turbulence difference on each plane wing model Keywords: Turbulence- Laminar- Air Density- Altitude- Air Pressure- LTD Device- Wing Prototype Share Link | Plain Format | Corresponding Author (Riki Purnama Putra)

375	Physics	ABS-179
Earthquake surface acceleration with slope function amplification approach in Bandung Basin, Indonesia A J Syahbana1,2*, O F Saputra1, A M Sari1, A Fakhrurrozi1, C M Azwar3, M Asrurifak4, Hendriyawan2, and M Irsyam2 1Pusat Penelitian Geoteknologi, Lembaga Ilmu Pengetahuan Indonesia, Jl. Sangkuriang No.1, Bandung 40135, Indonesia 2Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia 3Fakultas Ilmu dan Teknologi Kebumian, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia 4Sekolah Teknik Sipil, Institut Sains dan Teknologi Nasional, Jl. Moh Kahfi II, Jakarta Selatan 12640, Indonesia Abstract The Bandung Basin is an area located in the middle of the mountains of West Java, Indonesia. Located at the coordinates of 7 ° N - 7 ° S and 107 ° -108 ° East, the area has a large area and is relatively flat. The area is planned to become an Urban Area. The area is threatened by natural disasters, an earthquake caused by the Lembang Fault and a source of shallow and deep background earthquakes. This natural phenomenon can cause a high surface acceleration of the earthquake, causing infrastructure damage. Therefore, earthquake mitigation efforts need significant attention. In this study, the surface acceleration of the earthquake will be analyzed using the Probabilistic Seismic Hazard Analysis (PSHA) method for the 2500-year return period combined with the amplification function of the slope effect. The results obtained are that the highest surface acceleration is in the area near the Lembang Fault, which reaches> 2.0g and is followed by the area in the middle of the Bandung Basin, which reaches 1.0g and a small part of the west side reaches 2.0g. Amplification occurs in relatively flat areas and vice versa- deamplification occurs on the south-central side of the Bandung Basin, associated with hilly/mountainous areas. Keywords: earthquake surface acceleration, slope function amplification, Bandung Basin Share Link | Plain Format | Corresponding Author (Arifan Jaya Syahbana)

376	Physics	ABS-444
HYPOTHETICAL PLANET IN THE ASTEROID BELT: AN UNDERGRADUATE EXERCISE IN CELESTIAL MECHANICS JUDHISTIRA ARIA UTAMA (a*), LALA SEPTEM RIZA (b), TAUFIQ HIDAYAT (c) a) Department of Physics Education, Faculty of Mathematics and Natural Sciences Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia * j.aria.utama[at]upi.edu b) Department of Computer Science Education, Faculty of Mathematics and Natural Sciences Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia c) Astronomy Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Abstract This paper presents a computational laboratory activity as a mini research project in the celestial mechanics course for undergraduate students. Utilizing the ORBE (ORBit Evolution) orbital integrator package to solve the 2nd order differential equation in the N-body problem, we have exemplified the orbits evolution of the Solar System over the next 100 mega years (My) into the future since epoch JD2459000.0 to investigate the effect of the presence and absence of hypothetical planet resides in Asteroid Belt to the orbit of the Earth. Computation results are compared then to assess the orbits evolution experienced by the Earth in relation to the planet^s ability to support life. Keywords: Celestial Mechanics- ORBE- Habitable Planet Share Link | Plain Format | Corresponding Author (JUDHISTIRA ARIA UTAMA)

377	Physics	ABS-192
MQ-2 gas sensor using micro controller Arduino Uno for LPG leakage with short message service as a media information. Sohibun (a*), Yeza Febriani (b), Ika Daruwati (b), Rindi Genesa Hatika (b), Dedi Mardiansyah (b) a) Departement of Physics Education, Pasir Pengaraian University, jalan Tuanku Tambusai Pasir Pengaraian Rokan Hulu, Riau 28557 Indonesia. *bie.idsohib[at]gmail.com b) Departement of Physics Education, Pasir Pengaraian University, jalan Tuanku Tambusai Pasir Pengaraian Rokan Hulu, Riau 28557 Indonesia. Abstract This research was to detect leakage of LPG gas automatically. Design of this device consists of a gas detection sensors LPG MQ-2, which serves to detect the levels of LPG in the air, the sensor signal analog is converted to digital by the ADC and processed by a microcontroller Arduino Uno to command activation of the buzzer and SMS (Short Message Service), sensor system is also capable of displaying a LPG gas concentration detected by the LCD in ppm. The study was conducted at three different space conditions of the open, semi-open and closed, based on the distance detection and characterization. The analysis of the data obtained, that the tool to work optimally at a distance of 3 cm closer to the source of the leak tool then the maximum LPG gas leak detection tools. Based on the characterization of the sensor that is an accuracy of 1 to 2.6 volts and repeatability error of the three conditions of the room is <10%, so that the tool is expected to cope with and anticipate the risk of accidents due to leakage of LPG gas early and real time. Keywords: LPG, MQ-2 Gas Sensor, Microcontroller, Arduino Uno, SMS (short message services) Share Link | Plain Format | Corresponding Author (sohibun sohibun)

378	Physics	ABS-458
Energy Efficiency Comparsion in Boiling Water using Gas, Electric, and Induction Cooktops and Determination of Container Emissivity Coefficient A W Hasanah 1, A S Sunarya 2, S Viridi 3 1 Department of Electrical Engineering, Faculty of Electric Power and Renewable Energy, Institut Teknologi PLN, Jakarta 11750, Indonesia 2 Department of Manufacturing Automation Engineering and Mechatronics, Politeknik Manufaktur Bandung, Bandung 40135, Indonesia 3 Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia Abstract A 1.315 kg stewpan is used to boil 1 kg water using three different type cooktops, i.e. gas, electrik, and induction. Power of the electric cooktop is 600 W, gas cooktop uses maximum setting (large burner in control knob), and induction cooktop has maximum power of 1200 W. We have observed to two different setting of power: 600 W and 1200 W. In the first setting we compare induction and electric cookops, while in the second one induction and gas cooktops are compared. We obtain energy efficiency about 67.24% and 56.2% for the first setting and 74.03% and 38.55%, which show that induction cooktop always gives the better performance compared to the other cooktops. Besides this we always investigate to energy leak from the stewpan to the environment through radiation, which should be the same since all four observation were using the same container to boil the water. Keywords: gas cooktop, electric cooktop, induction cooktop, energy efficiency, radiation, emissivity. Share Link | Plain Format | Corresponding Author (Aas Wasri Hasanah)

379	Physics Education	ABS-1
Misconceptions on the electricity and magnetism R Meikana- S Syuhendri- N Andriani Universitas Sriwijaya Abstract It has been categorized the senior high school students^ conceptions on the electricity and magnetism topics in Indonesia. The research used descriptive qualitative method by Certainty of Response Index (CRI) technique analysis. The instrument used was Electricity and Magnetism Conceptual Assessment, comprising of 20 multiple choice questions with open reasoning. The research found that 58,5% of the participants hold misconceptions on the topic of electricity and magnetism, 27,5% of them experience lack of knowledge, and only 14% understand the concepts correctly. These revealed that the students experienced some strong misconceptions on the electricity and magnetism topic. The most common misconceptions experienced were about electric charge, i.e. 75% and circuit distribution, i.e 69.2%. While the lowest one was on the electric fields, i.e. 35%. The results are expected to provide information about students^ misconceptions on the electricity and magnetism and can serve as a guide for further research to find out the appropriate conceptual change teaching strategies to recover the misconceptions and to improve students^ conceptual understandings Keywords: Misconceptions, electricity and magnetism. Share Link | Plain Format | Corresponding Author (Syuhendri Syuhendri)

380	Physics Education	ABS-513
Using Weather and Climate Electronic Learning Materials Contain Religious Values to Improve Students^ Spiritual Attitudes A Suhandi (a*), A Samsudin(a), D C Nugraheny(b), D Rukmana(c) a) Departemen Pendidikan Fisika FPMIPA UPI, Jl Dr. Setiabudhi No 229 Bandung, Indonesia b) Prodi S3 Pendidikan dasar SPs UPI, Jl Dr. Setiabudhi No 229 Bandung, Indonesia c) Prodi S3 Pendidikan IPA SPs UPI, Jl Dr. Setiabudhi No 229 Bandung, Indonesia Abstract Abstract. The aim of this study was to obtain an overview of the effect of using weather and climate electronic learning material contain religious values in earth and space science learning towards improving the spiritual attitude of prospective elementary school teacher students. Weather and climate electronic learning material consists of five section. In the third part of the electronic learning material, the content of religious values in the context of weather and climate is presented, aided by a serial dialogical question format. The method used in this study is a pre-experiment with one group pretest-posttest design. The number of research subjects was 30 students in the PGSD program at one university in West Java province. The subjects were selected by purposive sampling technique. Data were collected by The SAI (The spiritual assesment inventory) instrument. The results showed that the use of weather and climate electronic learning material contain religious values in earth and space science learning can improve every aspect of the spiritual attitude of almost all elementary student teacher candidates. These results indicate that the use of the electronic learning material has a high effectiveness in improving the spiritual attitude of prospective elementary school teacher students. Keywords: Weather and Climate, electronic learning materials, religious values, spiritual attitude Share Link | Plain Format | Corresponding Author (Andi Suhandi)

381	Physics Education	ABS-514
Critical Thinking Skills Enhancement: Implementation of CLIS Learning Models on Work and Energy Erwina Oktavianty (a*), Haratua Tiur Silitonga (a), Reni Marlina, Indah Sanita Dirsa(b) Universitas Tanjungpura Abstract The purpose of this study was to improve critical thinking skills using the Children Learning In Science (CLIS) model of students about work and energy at Junior Secondary School in one district of West Kalimantan. The form of research used a pre-experiment with a one-group pretest-post-test design. The research sample was selected by using the intact group technique randomly. The research instrument consisted of 6 essay questions. The pretest data was 49% in the medium category, while at the post-test it was 63% with the high category. (t count> t table), so that Ho is rejected. This shows a significant increase in the critical thinking skills of students. The increase in critical thinking skills in the CLIS model uses a gain score of 0.3 in the moderate category. So, it can be concluded that the application of the CLIS model can improve critical thinking skills in energy and work materials. The CLIS model can be used as an alternative in the learning process to improve students^ critical thinking skills in work and energy materials Keywords: CLIS, critical thinking skills, work and energy Share Link | Plain Format | Corresponding Author (Erwina Oktavianty)

382	Physics Education	ABS-516
Undergraduate Student^s Misconception About Projectile Motion After Learning Physics During The Covid-19 Pandemic Era Aprina Defianti, Puspo Rohmi Universitas Bengkulu, UIN Sunan Kalijaga Abstract This research aimed to describe undergraduate students^ misconception about projectile motion after learning physics during the covid-19 pandemic era. This research was qualitative research with a descriptive method. The subjects were 52 first-year undergraduate students who took physics courses. Data collecting methods used in this research were a test, questionnaires, and interviews. The test was taken from Physics by Giancoli with an additional question about certainty of response index (CRI). Data from the test were analyzed by categorizing it into lack of knowledge, knowledge of correct concepts, and misconception while open-ended questionnaires and interviews were used to help to clarify the condition. The test results indicated that 5.13% of students in lack knowledge, 28.85% the knowledge of correct concepts, and 66.02% in misconception. The questionnaire responses showed that students learned physics via online meeting with direct instruction model and ask-answer method, exercised with only applied problem (C3), and virtual practicum. The interviews showed that only a few of the students learned physics and responded to the lecturer during the online meeting. From the results, it can be concluded that the majority of first-year undergraduate students are in misconception after learning physics during the covid-19 pandemic era and need remedial learning about projectile motion. Keywords: Misconception, Projectile Motion, Learning Physics, Covid-19 Pandemic Era Share Link | Plain Format | Corresponding Author (Aprina Defianti)

383	Physics Education	ABS-5
Technical-Vocational Education (TVE) High School Students Conceptual Understanding and Mental Models about Electric Circuits Jasmin Eléna B. Orolfo (a), Voltaire M. Mistades (b*) a) Nemesio I. Yabut Senior High School, Makati, Philippines b) De La Salle University, Manila, Philippines *voltaire.mistades[at]dlsu.edu.ph Abstract The study investigated the robust conceptions of Technical-Vocational Education (TVE) high school students about electric circuits to identify their mental models and to enumerate the teaching and learning implications of these conceptions and mental models. Using a descriptive design in snapshot approach, one hundred and ninety-five (195) students, specializing in Electrical Installation and Maintenance (EIM) from Grade 8 (n=88), Grade 9 (n=88), Grade 10 (n=4), and Grade 11 (n=15), took the diagnostic test Determining the Resistive Electric Circuits Concepts Test (DIRECT). Interview was used as follow-up tool to qualitatively assess the students^ reasoning. The results were interpreted using both quantitative and qualitative analysis. The study showed that majority of the students have misconceptions and incomplete conceptions about electric circuits and the elements that make a circuit work. While they showed familiarity with actual circuit elements, they lacked familiarity with the symbols used in an electric circuit. The TVE students had varied understanding about how energy flows in an electric circuit. Some students subscribed to the Unipolar Model, the idea that electrical energy flows from the negative terminal only. The Bipolar Model was also present among the students, with the students describing the current from the positive terminal moving faster than the current that flows out of the negative terminal. The students^ self-constructed idea about what happens when the energy reaches the load is analogous to a two-way traffic model. In teaching the TVE high school students, there is a need to reinforce their technical learning by acquiring conceptual understanding of electric circuits in their Physics classes. Keywords: Technical Vocational Education- conceptual understanding- mental models- electricity- electric circuits- high school students Share Link | Plain Format | Corresponding Author (Voltaire Mistades)

384	Physics Education	ABS-517
Cooperative Learning Model in Science Online Learning for 9th Grade Students Shafa Namira Nur Rachmadewi, Hana Luthfiyah Nurulita, Rakhil Nur Filhak, Salsabilla Az Zahra, Anna Pemanasari, Eliyawati International Program on Science Education, Universitas Pendidikan Indonesia, Jl. Dr. Setia Budhi No. 229, Bandung 40154, Indonesia Abstract Many instructional strategies play important role in science learning, especially for cooperative learning. This research study is to observe and analyze how the student cooperates in teaching and learning of science in online learning. This research used observation and interviews as a tool to collect the data. The observations conducted at an international junior high school in Kota Bandung. Instruments of research that we used are the rubric of the teaching-learning process, the rubric of student activity, and the rubric of cooperative learning model. From the data analysis, the learning model used in this online class meeting is proper enough for it is fulfilled the syntax of cooperative learning. Keywords: cooperative learning, learning model, online learning, science. Share Link | Plain Format | Corresponding Author (Shafa Namira Nur Rachmadewi)

385	Physics Education	ABS-270
Scrutinizing Metacognition Relation with Students Achievement in Physics Classroom Through SEM-PLS: A Preliminary Research Firman Nugraha (a*), Irma Rahma Suwarma (a) Physics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40132, Indonesia *firmannugraha[at]upi.edu Abstract Research on metacognition have been trending across this decade. Researchers claim that fostering this ability would lead to better learning performance. The aim of this study is to give some brief description about how self-assessed metacognitive skills relate to students achievements in physics classroom. This study uses Physics Metacognitive Inventory (PMI) as instrument to give information about students metacognitive ability. This instrument assessing the ability of metacognitive knowledge, planning, monitoring, evaluating, debugging, and managing information. 103 students consist of 46 males and 47 females being chosen as subject for this study. Results show that self-reported metacognitive ability has average positive correlation on students achievement. Some aspects like metacognitive knowledge, planning, and evaluating yield a positive correlation while debugging, monitoring and managing information need further analysis. Keywords: Metacognition, Share Link | Plain Format | Corresponding Author (Firman Nugraha)

386	Physics Education	ABS-18
Identifying Javanese students conceptions on fluid pressure with Wright Map analysis Achmad Samsudin1, Andi Suhandi1, Adam Hadiana Aminudin1, Nuzulira Janeusse Fratiwi1, Rizal Adimayuda2, Mohammad Noor Faizin3, Suharto Linuwih4, Bayram Costu5 1 Departemen Pendidikan Fisika, Universitas Pendidikan Indonesia, Bandung, Indonesia 2 Prodi Pendidikan Fisika, Institut Pendidikan Indonesia, Garut, Indonesia 3 SMP Negeri 2 Kudus, Kudus, Indonesia 4 Jurusan Fisika, Universitas Negeri Semarang, Semarang, Indonesia 5 Department of Science Education, Yildiz Technical University, İstanbul, Turkey Abstract This research aims to identify the conception of Central Javanese students on fluid pressure. The survey was conducted in Central Java involving 515 participants (eight grade students about 14 years old) consisting of 177 Male and 338 Female. The instrument consists of six questions in a four-tier format about fluid pressure and is distributed via Microsoft Form. The analysis was carried out with Rasch analysis and percentages with six categories of conceptions: CU (Conceptual Understanding)- PP (Partial Plus)- PM (Partial Minus)- NU (No Understanding)- MC (Misconception)- and NC (No Coding). The Rasch analysis show the Cronbach alpha is 0.68 (Enough) and the distribution of students^ conceptions on fluid pressure forms a normal curve. Meanwhile, the percentage are: CU (17%), PP (4%), PM (39%), NU (13%), MC (27%), and NC (0%). This indicate that students^ conceptions are still dominated by PM and MC, thus, the action is needed to overcome. Keywords: Javanese students conceptions- fluid pressure- wright map Share Link | Plain Format | Corresponding Author (Achmad Samsudin)

387	Physics Education	ABS-530
THE EFFECTIVENESS OF STUDENT^S WORKSHEET ABOUT PHYSICS OF BIOLOGY TO IMPROVE STUDENT^S SCIENTIFIC LITERACY Dewi Dewantara, Saiyidah Mahtari, M Misbah, Surya Haryandi Physics Education Study Program, Universitas Lambung Mangkurat Abstract This article focused on describing the student worksheets^ effectiveness in Biology Physics courses in order to improve student scientific literacy. This article is a part of the research development of student worksheets in Biology Physics courses to train student scientific literacy as a disseminate stage. The effectiveness of the student worksheets is based off pretest and posttest. The students of Biology Physics at Lambung Mangkurat Universityform Physics Education Study Program of the 2019/2020 academic year is a subject research. The pretest and posttest data were tested for normality and homogeneity showed that the data were normally distributed and the variants were homogeneous. Then, it tested for the significance differences using the paired t test. The t-test result shows a significant difference between the pretest and posttest results. The effectiveness of student worksheet implementation is tested by the N-gain test to determine its effectiveness category. The Ngain test result is 0.724 and categeorized as high category. Thus, it can be concluded that the student worksheets is effective toimproving scientific literacy in Biology Physics courses within high effectiveness category. Keywords: Scientific literacy, students worksheet, biology physics, efectiveness, development Share Link | Plain Format | Corresponding Author (Dewi Dewantara)

388	Physics Education	ABS-533
Analysis of students^ conceptual understanding profile using Rasch Model on Newton^s Law material Rita Febriana(a)*, Selly Feranie(b), Ida Kaniawati(b) a*) Master of physics education study program, Universitas Pendidikan Indonesia, Jl. Setia Budhi No. 229, Bandung 40154, Indonesia *ritafebriana[at]upi.edu b) Department of physics education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia Abstract This study aims to determine the profile of students^ conceptual understanding in the material of Newton^s laws. Understanding the concept is a very important component in learning physics. The research design used was a post-test only one group design. The research subjects consisted of 36 students in class X SMA, 19 female and 17 male, students with an average age of 16-17 years. The research instrument consisted of 15 multiple choice questions about material of Newton^s laws. The results showed that most of the students still had a concept understanding that was lower than 0.0 logit. There are differences in conceptual understanding between female and male students at certain cognitive levels. The results of this study can contribute information and descriptions to the teacher about the condition of students^ conceptual understanding abilities. Teachers can make various kinds of efforts and innovations in improving students^ conceptual understanding. Keywords: Analysis, conceptual understanding, rasch model Share Link | Plain Format | Corresponding Author (Rita Febriana)

389	Physics Education	ABS-280
Implementation of Higher Order Thinking Laboratory (HOTLAB) on magnetic field with real blended virtual laboratory to improve students critical thinking skills W Setya, R D Agustina, R P Putra, S Prihatini, R Hidayatulloh, P S Isnaeni, and A Malik. Department of Physics Education, Universitas Islam Negeri Sunan Gunung Djati Bandung, Jl. AH. Nasution 105, Bandung 40614, West Java, Indonesia. Abstract During the Covid-19 pandemic, which still hit Indonesia, the teaching and learning process took place online and students were still required to have critical thinking skills, problem solving, and communication skills. These skills can be trained and developed through Higher Order Thinking Virtual Laboratory (HOT-V Lab) activities. This study aims to determine the effect of HOTVL laboratory activities on improving critical thinking skills of magnetic field material. The experimental class and control class were given a pretest and posttest in both classes. The results of this study indicate that the magnetic field practicum activity using the HOT-V Lab model in the experimental class has increased significantly in fulfilling the learning characteristics oriented to providing critical thinking skills. Keywords: Higher Order Thinking, magnetic field, online learning, physic, virtual laboratory Share Link | Plain Format | Corresponding Author (WINDA SETYA)

390	Physics Education	ABS-28
The Effectiveness of Using E-book Based on Multimodal Representation and Technological Pedagogical and Content Knowledge (TPACK) to Improve Information and Communication Technology (ICT) Literacy of Physics Teachers Masrifah Masrifah (a*), Agus Setiawan (b), Parlindungan Sinaga (b) and Wawan Setiawan (b) a) Program Studi Pendidikan Fisika, Universitas Khairun Ternate, Jl. Bandara Baabullah, Kota Ternate, 97728, Indonesia *masrifah[at]student.upi.edu b) Sekolah Pasca Sarjana, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia. Abstract This research aims to determine the effectiveness of using the Physics teacher^s guide e-book based on multimodal representation and Technological Pedagogical and Content Knowledge (TPACK) in improving teachers^ ICT literacy. Given the important role of technology in the learning process, especially in the current of Covid 19 pandemic era. The research method used was experimental research with a nonequivalent control group design. This research involved 61 in-service physics teachers (44 female and 17 male) as participants who were taken by purposive sampling. In addition to in-service teachers, the research also involved 40 pre-service teachers that consisting of 7 male and 33 female. The instruments used included questions on the ICT literacy test on the knowledge aspect, and a four-scale questionnaire. Teacher literacy data were analyzed using normalized gain test, average difference test and effect size test to determine the effectiveness of e-books in improving teacher ICT literacy. The physics teacher^s guide e-book used in this study is in an e-Pub format that can display simulation and animation videos that can be accessed offline so that it is easy to learn anytime and anywhere by the teacher. The analysis of ICT literacy data was carried out with the help of the IBM SPSS.20 software. The results showed that the Physics teacher^s guide e-book was effective in increasing teachers^ ICT literacy. This product has a greater impact on the increase of literacy compared to the teacher^s commonly used books. In addition, the results of the questionnaire data analysis showed that the teacher^s response stated that they strongly agreed with the Physics teacher^s guide e-book that was used to improve their ICT literacy. Keywords: E-book,ICT Literacy, Physics teacher Share Link | Plain Format | Corresponding Author (Masrifah Masrifah)

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