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241	ABS-249	Mathematics Education
ANALYSIS OF STUDENTS MATHEMATICAL THINKING BASED ON THEIR LEARNING STYLE Nita Delima (a*), Mariam Ar Rahmah (b), Muchamad Subali Noto (C) (a) Universitas Subang, Jln. RA. Kartini Km. 3 Subang 41214, Indonesia * nitadelima1985[at]gmail.com (b) Universitas Subang, Jln. RA. Kartini Km. 3 Subang 41214, Indonesia (c) Universitas Swadaya Gunung Djati, Jln. Perjuangan No. 01 Karyamulya Kesambi Cirebon Indonesia 45131 Abstract The purpose of this study is to describe the students mathematical thinking based on their own learning style. The second objective of this research is to find out which one of the learning style which has the highest mean score of the students mathematical thinking. In addition, this study also aims to find out whether there is a relationship between the students mathematical thinking with the learning style they have. Based on the result of research, the students mathematical thinking mostly in the medium level. Meanwhile, the dimension of learning style possessed by the majority of students is an assimilating learning style. Students with medium level of mathematical thinking, have an assimilating style. The highest mean score of the students mathematical thinking test is obtained by group of students who have converging style. Although there is a difference in the statistical description, but the relationship between students mathematical thinking with their own learning styles is not significant. Nevertheless, the knowledge of the description of these two variables can serve as a good enough reference for determining the students self-development direction in the future Keywords: students mathematical thinking,learning style PermaLink | Plain Format | Corresponding Author (Nita Delima)

242	ABS-250	Mathematics Education
Enhancing Students Mathematical Synthesis Ability By Superitem Learning Model Vara Nina Yulian(a,b*), Wahyudin(a) a) Study Program of Mathematics Education, School of Postgraduate Studies, Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi 229, Bandung, Indonesia *varanina15[at]student.upi.edu b) Study Program of Mathematics Education, Universitas Subang Jl. RA Kartini Km 3 Subang, Subang, Indonesia Abstract This study aims to determine the improvement of students mathematical synthesis ability and student attitudes toward learning mathematics with superitem learning model. This research was quasi experiment in nature, with pretest posttest control group design. The experimental class is given in the form of learning with superitem learning model and control classes are given learning with conventional learning model. The populations of this study are students of 8th grade public junior high school at North Bandung, with the research sample is selected two classes. Two classes are selected to be used as experimental class and control class. The instrument used consisted of mathematical synthesis ability test and attitude scale. The results of this study conclude that students mathematical synthesis ability thats learning with superitem learning model better than students who received learning with conventional model. Students give positive responses and attitudes toward learning with superitem learning model. Keywords: Mathematical Synthesis Ability; Superitem PermaLink | Plain Format | Corresponding Author (Vara Nina Yulian)

243	ABS-254	Mathematics Education
Mathematical Communication Using Quantum Teaching based on Hypnoteaching (QTH) in the Primary School Teacher Education (PSTE) Students Idha Novianti (a*), Endang Cahya Mulyaning A. (b), Nanang Priatna (b) a. Indonesia Open University b. Indonesia University of Education Abstract The lack of mathematical communication ability of the students is the result of less precisely applied learning model. Quantum Teaching based on hypnoteaching is a learning that is expected to improve students mathematical communication because by this model the material is explained in an effective and efficient way, and also the provision of hypnoteaching during learning its cause students eager to learn. This study is an experimental research. There are 50 seventh semester students of PSTE student as sample in this experiment selected randomly. An experimental class is provided with Quantum Teaching based on hypnoteaching (QTH), and a control class is given Ordinary Learning (OL). The instruments used are: test, observation sheet, and interview guide. Techniques of data analysis in this study using two-way Analysis of Variance with unequal cells. The result of this research is QTH learning have a better mathematical communication ability than student with OL. Based on the level of mathematical ability (high, medium, and low), medium and low-ability students show significant differences, but not for high-ability students. Based on the response shown through the test, students with QTH showed activity, and better performance compared to OL. Keywords: Mathematical communication, Quantum Teaching based on hypnoteaching, math ability, PSTE Students PermaLink | Plain Format | Corresponding Author (Idha Novianti)

244	ABS-255	Mathematics Education
Reflective Inquiry: Why Area is Never Negative? Almas Fitri Hanifat(a*) , Didi Suryadi (b), Encum Sumiaty (b) a) Faculty of Mathematics Education, Indonesia Unversity of Education Jalan Dr. Setiabudhi No. 229, Bandung 40154, Indonesia *almasfitri[at]gmail.com b) School of Postgraduate, Indonesia, University of Education Jalan Dr. Setiabudhi No. 229, Bandung 40154, Indonesia Abstract Reflective Thinking is an important process for an educator to be more professional. Educator can practice reflective thinking with doing reflective inquiry. The reflective inquiry gas a doctrine, that we not receive immediately something into information, but its require examined and proven to be accepted as information. Information that examine in this inquiry is statement about area is never negative. A deep inquiry to prove that area is never negative lead to a re-reconstruction of the belief system within self, thereby generating new perspective and providing alternative solution to answer why area is never negative? Although its not clearly defined that area is never negative, why people accept is as a common sense? What underlies that area is never negative, even teacher itself dont know the reason? Doesnt teaching without understanding is consider as irresponsible action to student? Worried with this condition researcher try to figure it out and prove area is never negative with relation between measure, metric, dimension, length, and area in real set. Measure is foundation in this relation, with measure defined nonnegative, causes metric and dimension defined with nonnegative value. Resulting length as measure in dimension one is nonnegative and proven that area is never negative Keywords: reflective inquiry, area, measure, dimension PermaLink | Plain Format | Corresponding Author (Almas Fitri Hanifat)

245	ABS-4	Physics
Sensitivity of Earthquake Input Motion correlation with Arias Intensity and Amplification, Case Study: Yogyakarta Special Region Arifan Jaya Syahbana(a,b*), Anggun Mayang Sari(b), Eko Soebowo(b) a) Department of Civil Engineering, Bandung Institute of Technology, Bandung, Indonesia arifanjaya[at]s.itb.ac.id b) Geotechnology Research Center, Indonesian Institute of Sciences, Bandung, Indonesia Abstract Earthquake problems are a hot topic that is being discussed in the scientific and academic world, one of them is parameter sensitivity. In this study, the sensitivity level of earthquake input motion in bedrock will be encorrelated with intensity arias and amplification occurring at surface. The location of the study selected is an earthquake prone area with the last record of a major earthquake in 2006, Yogyakarta Special Region. The areas to be analysed are 3 (three) points with different geological environments. Testing is conducted by: (1) declustering and completeness analysis of earthquake catalogue (2) deagregation (3) selection of motion input and (4) wave propagation analysis to obtain graph of arias intensity and amplification value. These steps are aided by Zmap and DeepSoil software. The expected result in this study is the quantification of the input motion sensitivity in each geological environment based on amplification value and arias intensity. The softer the local geology environment the higher the amplification value and the effective time on arias intesity will increase. Keywords: Sensitivity, arias intensity, amplification PermaLink | Plain Format | Corresponding Author (Arifan Jaya Syahbana)

246	ABS-6	Physics
PETROGAFI and XRD ROCK DOLOMITES, PACIRAN FORMATION, DISTRICT OF LAMONGAN, EAST JAVA Dedi Mulyadi, Haryadi Permana, Solihin, Mutia Dewi yuniati Puslit Geoteknologi LIPI Bandung Abstract Batugamping area research in Paciran area has attracted many geologists. Limousine Paciran is known to have more dolomite composition than limestone located in Tasikmalaya or other areas. The limestone facies in the area consisting of Packstone, wackestone and mudstone of Xrd analysis on the dolomite limestone are almost 31.02%, diagenes of limestone include dissolution, dolomitization and cementation. At this time the limestones Paciran continues to be explored by miners for mining needs, dolomite as building construction, cement making, Neutralizing acid in the chemical industry, magnesium and calcium sources in animal feed, flux in metal processing industry, glass making base material, ceramic, as fertilizer in paper industry Keywords: limestone paciran, dolomite, Xrd PermaLink | Plain Format | Corresponding Author (Dedi Mulyadi)

247	ABS-270	Physics
Character of interface dislocation in ZnO films grown by P-MBE on c-sapphire with MgO buffer Agus Setiawan Department of Mechanical Engineering Education, Universitas Pendidikan Indonesia Abstract ZnO is a promising photonic material for exciton devices in the wavelengths ranging from blue to ultraviolet. Challenges of moving toward device applications are the difficulty in achieving high crystal quality ZnO by reducing dislocations. Therefore, efforts for reducing dislocations are very important. This paper addresses character of interface dislocations in ZnO film grown on c-sapphire with MgO buffer by P-MBE method. The ZnO films ware characterized, mainly by HRXRD and TEM. A high density interfacial threading dislocations was observed in the ZnO film with domination of edge-type as compared to screw and mixed types dislocations. Furthermore, crystalline quality of the ZnO films have increased by increasing of film thickness, indicating these threading dislocations are not along the c-axis so that they strongly interact with each other and annihilated. This result implies the important of initial growth control and role of buffer layer. Keywords: ZnO films, dislocations, HRXRD, TEM PermaLink | Plain Format | Corresponding Author (Agus Setiawan)

248	ABS-272	Physics
Preliminary Results of Magnetic Mineral Identification of sand deposits in the Northern Coast of Manokwari, West Papua by Rock Magnetism Sangaji Hasmi Maharani Ipa (a*), Innaa Uswatun Hasanah (a), Siti Hadjar Kubangun (b), Satria Bijaksana (c) and Darharta Dahrin (c) (a) Department of Physics, University of Papua, Manokwari 98314, Indonesia *ajiipa2012[at]gmail.com (b) Department of Soil Science and Land Resources, University of Papua, Manokwari 98314, Indonesia (c) Department of Geophysics Engineering, Bandung Institute of Technology, Bandung 40132, Indonesia Abstract Magnetic minerals contained in iron sand deposits are widespread natural resources in the territory of Indonesia and their management into high value mineral resources has been conducted in most areas. However, there are still areas that have not been well inventoried of the data of potential, reserves, and management of the iron sand mineral resources. Sand deposits in the northern coast of Manokwari, West Papua has a gray to blackish color and potentially contained iron sand but its existence is still used only as a building material. This research is a preliminary study focusing on identifying magnetic mineral as an indicator of magnetic mineral potential in samples from Kaironi, Warbefor, and Amban. The identifications using the rock magnetism technique are done by determining distributions of grain size, magnetic degree, density, magnetic susceptibility, and also SEM and EDS testing. The results showed that the distribution of grain size varies from very fine ( less than 0.044 mm) to very coarse (more than 1 mm). Sand sample with the magnetic degree above 30% is from Amban 2. This sample has about 5.00 g/cm3 of density, the magnetic susceptibility reaches 112.863 cm3/kg and the highest percentage of Fe element is 35.39%. Further research on that site should be undertaken to obtain the magnetic mineral distribution data located along the coast in a better management effort. Keywords: magnetic mineral, grain size, magnetic degree, density, magnetic susceptibility, SEM, EDS, Northen Coast of Manokwari, West Papua PermaLink | Plain Format | Corresponding Author (Sangaji Hasmi Maharani Ipa)

249	ABS-23	Physics
THE ANALYSIS OF WASTED GREASE AMOUNT TOWARDS FILTERING MACHINES SPINNING RATE Siska Nuraidah*, Ahmad Aminudin, Waslaluddin Program Studi Fisika, Universitas Pendidikan Indonesia Jl Dr.Setiabudhi No 229, Bandung, Indonesia. *Email: siska.nuraidah[at]student.upi.edu Abstract Grease amount inside a food can influence humans health. Grease amount in a food has correlation with cholesterol amount which could lead to various diseases, as stated in Regulation of the Minister of Health number 30, year 2013, clause number 4, and verse number 2 which said that more than 67 grams of total fat per day for each person leads to hypertension, stroke, diabetes, and cardiac arrest risk. This research purposed to characterize wasted grease amount of food towards various spinning cycle of grease filtering machine. Various methods could be implemented to decrease the grease amount in a food, potato chips. Using the influence of centripetal force by applying motors spinning rate became the method which was implemented in this research. Determining volume of wasted grease amount was done by scaling food before grease filtering process then re-scale after filtering process was done. In order to find out the volume of wasted grease was through a division between the mass of wasted grease with the density of grease which is 0.8 g/cm3. Examination result shows potato chips grease amount decreased up to 10%. Wasted grease amount towards linear spinning rate with 0.99 determination coefficient graph also found based on experiments implementation. The result of research determines for each 1 rpm increase from spinning cycle, the numbers of wasted grease amount is 10.9 grams. Keywords: Spinning rate, Wasted Grease Amount, Filtering Machine PermaLink | Plain Format | Corresponding Author (Siska Nuraidah)

250	ABS-24	Physics
THE ELECTRICAL PROPERTIES CHARACTERIZATION OF MG-811 GAS SENSOR TOWARD THE TEMPERATURE ALTERATION OF SOIL TESTING CHAMBER Peny Saptiani, M Haidzar Aziz, Mimin Iryanti, Ahmad Aminudin Universitas Pendidikan Indonesia Abstract The concentration of CO2 in soil and air is strongly influenced by temperature. When the temperature increase, the thermal energy will increase too and make the particle motion faster . In detecting CO2 gases, the MG-811 gas sensor has a high sensitivity in detecting CO2 gases in the air. The purpose of the research is characterized the electrical properties of MG-811 gas sensor toward temperature alteration. The used method is the experimental method, where the chamber is made of iron filled with CO2 derived from the CO2 gas tube. In the chamber has been paired digital thermometer and MG-811 gas sensor. The temperature alteration in the CO2 gas is regulated by the heater element attached to the chamber. The output of the MG-811 gas sensor will be processed by microcontroller, so it measures the CO2 concentration in units of parts per millions (ppm). The higher the measured temperature on the gas causes faster particle motion, the measured CO2 gas concentration is high and the resulting output voltage is low. But it happens if the temperature change high, because the gas sensor response is slower than the temperature sensor used. Keywords: CO2 gases, heater element, MG-811 gas sensor, concentration PermaLink | Plain Format | Corresponding Author (Peny Saptiani)

251	ABS-34	Physics
DESIGN AND CHARACTERIZATION OF CAPACITIVE SENSORS FOR SOIL WATER CONTENT MEASUREMENT Eneng Riska Rahayu P.*, Ahmad Aminudin, Mimin Iryanti. Physics Program, FPMIPA Universitas Pendidikaan Indonesia Jl. Dr. Setiabudhi No.229 Bandung *Email : erahayuputri[at]gmail.com Abstract Soil water content is one of the measurable parameters which can be used as a reference in the selection of efficient land use. The methods used for measure the soil water content is gravimetric method which is commonly used for direct measuring and indirectly method with the measurement of traits related to water content, namely the dielectric constant (relative permittivity). Interdigital capacitor sensor is designed as a unit of measurement of soil water content. Interdigital capacitor sensor (IDC-S) is a capacitive sensor which is able to change the value of the physical parameters to electrical quantities (capacitance). The measurement of IDC-S capacitance value of soil water content variety was done. It is shown that greater percentage of soil water content cause greater value of capacitance. The greater number of sensor electrode increase its sensitivity. IDC-S has sensitivity of 5.589 pF for N= 200 electerodes, 4.6362 pF/% for N=150 electrodes and 3.8865 F/% for N=100 electrodes. Keywords: Capacitive Sensor; Interdigital Capacitor Sensor; Diectric; Soil Water Content. PermaLink | Plain Format | Corresponding Author (Eneng Riska Rahayu P.)

252	ABS-299	Physics
Application of Kirchhoff Prestack Time Migration Method of the 2D Marine Seismic Data for Mapping the Subsurface Structures in Dip Case Southern Aru, West Papua, Indonesia Hani Yusrina Safura (a*), Andrian Wilyan Djaja (b), Nanang Dwi Ardi (a), Priatin Hadi Wijaya (b) a) Physics Studies Program, Indonesia University of Education , Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia *haniyusrina.19[at]student.upi.edu b) Center for Research and Development of Marine Geology, Jl. Dr. Djunjunan No.236, Bandung 40174, Indonesia Abstract The natural resources of oil and gas potential in the West Papua waters constitute a significant expansion of oil and gas investments in Indonesias maritime specifically the eastern region. South Aru is located at the eastern edge of the basin trough Aru and includes one of the most potential oil and gas basins. Complex geological structures such as the case of large dip make seismic cross section results do not represent the subsurface structure of the earth nearing the actual subsurface geological conditions. The working principle of Kirchhoff Prestack Time Migration is looking for reflector positions using delay time of wave energy reflection to get a better seismic section on the tilted reflector with less diffraction effect and have little effect arch (smiling effect) which generates seismic section that can represent the subsurface structure of the earth. However, Kirchhoff Prestack Time Migration has a weakness, namely the inability to represent seismic sections accurately when there is a complex velocity structure due to approximations used in representing and calculating green functions, wave travel time and amplitude. The research data were analyzed is multichannel reflection seismic data of marine zones, namely the line 12th of the South Aru, West Papua waters. The results obtained in the form of time migrated section are analyzed based on their reflectivity In this research found that the cross section of the subsurface structure represented by a migrated seismic section amounted overall in 6107 CDP, along the path as far as 110 km with CDP space is 12.5 m with reflectivity cross section of generally more clearly observed after the migration process is carried out so that the resolution of cross section seismic better than that have not been migrated seismic section, which can be useful as the data is ready to be interpreted as the purposes of determination prospects of natural resources, especially regarding the hydrocarbon potential of the South Aru, West Papua waters. Keywords: Kirchhoff Prestack Time Migration, Seismic Reflection, Time Migrated Section, Dip, Complex PermaLink | Plain Format | Corresponding Author (Hani Yusrina Safura)

253	ABS-53	Physics
DESIGN SYSTEM OF PLANTING FLOORING SYSTEM ON GREEN HOUSE WITH MICROCONTROLLER MATRICES BASED Ririn Mudiyanti (a*), Lilik Hasanah (b), Ahmad Aminudin (b) a) Program Studi Fisika, Universitas Pendidika Indonesia Jl. Dr. Setiabudhi No.229, Bandung *Rmudiyanti21.rm[at]gmail.com b) Program Studi Fisika, Universitas Pendidika Indonesia Jl. Dr. Setiabudhi No.229, Bandung Abstract Chilli commodities are urgently required by Indonesian citizens. Planting a chilli are using two ways, with an open land such as a rich field and close land which is a greenhouse. In order to develop the highest quality for chilli using greenhouse method, we need a right treatment to watering. Nowadays, many people still using a manual method to water plants with a long hose to reach all the plants in the garden. The purpose of this research is to give a solution regarding that issue which to make a new technology at watering plants using the automatic watering tool, therefore, we could save time and energy, also knowing the accuracy of motor stepper movement. This method research is designed and builds automatic watering tool with 3 rows x 3 columns with a total of 9 plants and method using soil moisture sensor. The result of this research proving that accuracy of the stepper motor is 99,48%, errors that occur in the movement of the stepper motor is very minimal and this watering system is working when the moisture content in a soil is less than 51%. Keywords: Plant chili, automatic watering, stepper motor, accuracy, soil moisture sensor PermaLink | Plain Format | Corresponding Author (Ririn Mudiyanti)

254	ABS-323	Physics
The properties of zinc sodium phosphate glass system with various concentration of chromium oxide doped A S Budi(1)*, A H Permana(1), D Muliyati(1), N Primasari(2), E S Sazali(3) and D Ambarwulan(1) (1)Department of Physics, Universitas Negeri Jakarta, Jakarta, Indonesia (2)Department of Informatics Engineering, Universitas Presiden, Bekasi, Indonesia (3)Department of Physics, Universiti Teknologi Malaysia, Skudai, Malaysia *Corresponding e-mail: agussb[at]unj.ac.id Abstract In this research, we investigate the properties of zinc sodium phosphate glass system with various concentration of chromium oxide doped. The glass system was synthesized using melt quenching technique. The concentration of chromium oxide varying from 0.5% to 2.5%. We perform the vicker hardness test using 980 mNewton pressure. The test results show the concentration of chromium oxide effect to the hardness scale of glass system. We also perform FTIR test for knowing the relationship between the wavenumber and percentage of transmittance. Keywords: zinc sodium phosphate glass, chromium oxide doped PermaLink | Plain Format | Corresponding Author (Diah Ambarwulan)

255	ABS-79	Physics
Application of Gravity Theory on the Inter-Regional Internal Zones Movement Based on the Movement Generating of Land fishery Production Result in Central Java Province Juang Akbardin,Ahmad Samsudin, Khilyatul Khoiriyah Abstract The land fishery commodity producing zones and their products have limited characteristics within the limited distribution capability due to limited availability of infrastructure conditions. The condition of the transport infrastructure affecting the fishery feedstock production generation zones is identified as the influencing variable in the formation of the generation model. Regression analysis method with multiple variable of transportation infrastructure condition based on service level and quantitative capacity is determined as model variable formed. The result of modeling with multiple regrestion method gradually the model resulted from the modeling of the transportation movement production on the commodity frights the land fishery based on condition of infrastructure and production zones that is Ln Yi = 3,27 + 0,935 Ln X1 + 0,124 Ln X 2 + 0,0183 Ln X 3 + 0.0349 Ln X 4 + 0.005 Ln X 5 - 0.083 Ln X 6 + 0.0167 Ln X 7 - 0.0482 Ln X 8 + 0.0262 Ln X 9 - 0.0182 Ln X 10 - 0.107 Ln X 13 with the model significance of the determination test R2 = 0.86. The dominant factor of the infrastructure affecting the movement generating is the need for long-term capacity of roads in production zones to improve the accessibility and service of road pavement in good condition to support rising in the movement of land fisheries commodities and the results. Keywords: Movement Generating, Land Fishery, Production Zone, Gravity Theory PermaLink | Plain Format | Corresponding Author (Juang Akbardin)

256	ABS-341	Physics
Microcapsule Efficiency of Ethanol Extract of Sepal Flower (Hibiscus sabdariffa Linn) Coated Crude Carrageenan (Eucheuma cottoni) Ni Ketut Sumarni*, Yana Silvia Mauru*, Evi Sulastri**, Erwin Abd Rahim* *)Laboratory of Physics Chemistry, Faculty of Mathematics and Natural Science, Tadulako University **)Laboratory of Pharmacy Chemistry, Faculty of Mathematics and Natural Science, Tadulako University Abstract The research of microcapsule efficiency of ethanol extract of sepal flower (Hibiscus sabdariffa Linn) coated crude carrageenan has been done. The aim of research is to determine the highest eficiency microencapsulation based on the ratio of ethanol extract of the sepal flower toward seaweed crude carrageenan (Eucheuma cotonii ) as coating substance. The microencapsulation was carried out by using freeze drying technique. This encapsulation may preserve the active compound of ethanol extract. Ratio of ethanol extract of the sepal flower toward seaweed crude carrageenan were set at 1:3 1:4 1:5 1:6 dan 1:7 (w/w). The result of research obtained that the highest eficiency ratio is at 1:7 with percentage of 86,01%. Keywords: Ethanol extract , crude carrageenan, efficiency microcapsule PermaLink | Plain Format | Corresponding Author (Ni Ketut Sumarni)

257	ABS-342	Physics
AIR PRESSURE IN MINI HOVERCRAFT Ria Triayomi Primary School Teacher Education, Catholic University of Musi Charitas, Jl. Bangau No.60 Palembang 30113, Indonesia. Abstract Hovercraft is a vehicle that glides over a smooth surface by hovering over an air cushion. Therefore, hovercraft is also called Air-Cushion Vehicle or ACV. Hovercraft creates air vents, which are trapped under the vehicle with a curtain around the base. Air currents can make air cushion on the soil, smooth surface or water. A simple mini hovercraft that used for physics learning media on the pressure principal explains the utilization of air pressure on the mini hovercraft. The making of this mini hovercraft as a learning media is aimed to show the concept of pressure. From the results of observation and analysis of the data, it was proved that air pressure generated can produce bigger lift than the mini hovercraft weight. The air flowing out from the balloon in the bottom caused the mini hovercraft to be pushed upward. Keywords: Mini hovercraft, learning pressure PermaLink | Plain Format | Corresponding Author (Ria Triayomi)

258	ABS-94	Physics
EFFECTS OF TROPICAL CYCLONE ON THE PARAMETERS OF WEATHER TEMPERATURE, PRESSURE, AND HUMIDITY IN THE UNIVERSITY OF EDUCATION INDONESIA Harbi Setyo Nugroho, Cahyo Puji Asmoro, Arief Rizqiyanto Achmad, Nanang Dwi Ardi, Agus Fany Chandra Wijaya Laboratorium Bumi & Antariksa, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi 229, Bandung 40154, Jawa Barat e-mail: cp.asmoro[at]upi.edu Abstract The tropical cyclone that occurred in indian ocean can influence the weather parameters such as temperature, pressure, and humidity in some regions of Indonesia such as an area of Universitas Pendidikan Indonesia which is located in West Java so that the influenced of the tropical cyclone was studied. The study was done by processing the data generated through the Automatic Weather Station then analize the behavior of the weather parameters such as temperature, pressure, and humidity in the area of Universitas Pendidikan Indonesia throughout 15th November 2017 until 15th December 2017. This study concluded that the tropical cyclone can influence the weather parameters such as temperature, pressure, and humidity in the area of Universitas Pendidikan Indonesia. Keywords: The Tropical Cyclone, Weather Parameter; Automatic Weather Station PermaLink | Plain Format | Corresponding Author (Cahyo Puji Asmoro)

259	ABS-96	Physics
Analysis on meteorological parameters wind speed, temperature, and pressure profiles during Tropical Cyclone Cempaka Dahlia 2017 using time series clustering Cahyo Puji Asmoro, Lala Septam Reza, Nanang Dwi Ardi, Hikmat, Amsor, Yuyu Rachmat Tayubi 1 Department of Physics Education, Universitas Pendidikan Indonesia 2 Department of Computer Science Education, Universitas Pendidikan Indonesia Abstract Meteorological parameters such as wind speed, air temperature and pressure have been measured in the Menara Timur, FPMIPA UPI, Bandung, Indonesia during the Tropical Cyclone Cempaka Dahlia (TCCD) from November 27 until December 2, 2017. In this paper, we propose to analyze them by using time series clustering. The following steps are conducted : data collecting, splitting, smoothing, distance calculation, and clustering. The final results show cluster memberships of the three parameters on 3 time frames: one week before, the TCCD week, and one week after. After doing some simulations, it can be seen that profiles of wind speed, air temperature and pressure on TCCD week are on diffrent cluster from the one week before and one week after. Keywords: Meteorological Parameters, Time Series Clusttering, Tropical Cyclone PermaLink | Plain Format | Corresponding Author (Cahyo Puji Asmoro)

260	ABS-361	Physics
Pore Structure Characterization of Concrete Mixtures With Different Aggregates Using Digital Image Processing Analysis Fourier Dzar Eljabbar Latief (a*), Imran Hilman Mohammad (b), Ayomi Dita Rarasati (c), Nuraziz Handika (c) a) Physics of Earth and Complex Systems, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132, Indonesia *fourier[at]fi.itb.ac.id b) Department of Geophysics, Universitas Padjadjaran, Jalan Raya Bandung Sumedang KM 21, Jatinangor, Sumedang 45363 Indonesia c) Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia Abstract The presence of pores in a volume of concrete obviously affects the compressive strength of concrete (fc). Furthermore, characteristics of pores formed in concrete may vary, such as in shape, in size, in volume, and/or in its orientation tendencies. These characteristics also depend on the ingredient materials and the concrete casting process. In this research, three types of concrete in a form of cylindrical sample were analysed in order to investigate their pore structure characteristics. The first type of specimen is a core sample taken from a beam of an existing reinforced concrete structure building. It has 18 MPa of compressive strength. For the second type, an instant concrete with 40 MPa of designed compressive strength and 9 cm of slump test was chosen. The third sample is a concrete with Oil Palm Shell (OPS) as coarse aggregate substitution with 17 MPa of compressive strength. These three kinds of sample were scanned with a Bruker Micro-CT SkyScan 1173 device. The scanning process produced a set of projection images which were then reconstructed to obtain three-dimensional digital grayscale images. The pores inside the concrete sample are detected as dark pixels which represent low density structure. Based on the detected pores, the characteristics such as the volume distribution, the size distribution, the spatial distribution, as well as several structural descriptors such as shape, orientation and eccentricity of the pores were analysed. This study concludes that the type of aggregate greatly influences the characteristics of the pore formed in a concrete. Keywords: pore structure; digital image processing analysis; instant concrete; normal concrete; oil palm shell concrete; cylindrical specimen PermaLink | Plain Format | Corresponding Author (Fourier Dzar Eljabbar Latief)

261	ABS-366	Physics
Development of Static Solar Panel Equipped by an Active Reflector Based on LDR Sensors Widyaningrum Indrasari, Riser Fahdiran, Esmar Budi, Umiatin, Nur Salma Yusuf Hasanah Physics Department, Faculty of Mathematics and Science, Universitas Negeri Jakarta JL. Rawamangun Muka No.1 Jakarta, Indonesia Abstract Solar panels are a very effective source of renewable energy in Indonesia. To increase the output power of solar panels, especially on the static solar panels, a reflector is required as an additional device. This paper describes development of a static solar panel equipped with an active reflector. Five LDR sensors are mounted on the top of the reflector, to detect the highest solar intensity. Meanwhile, a DC motor as a reflector drive system is mounted on the bottom of the reflector. The slope angle of the solar panel is 45 and the reflector is 105 to the negative axis. The reflector will move in a semi-circular path, following the direction of the highest solar intensity detected by the LDR sensor. Three different reflectors used to optimize the output power, there are stainless steel, aluminum foil, and mirror. Solar panel with mirror reflector produces the largest output power compared to other reflectors. The output power of this device increases 1.6 times to the solar panels without reflector. Keywords: static solar panel, active reflector, LDR sensor, reflector drive PermaLink | Plain Format | Corresponding Author (Widyaningrum Indrasari)

262	ABS-113	Physics
Design of Carbon Dioxide Level Measures on Peat soil With MG 811 Sensor Muhamad Haidzar Aziz, Mimin Iryanti, Ahmad Aminudin Indonesia University of Education St. Dr. Setiabudhi No.229, Bandung Abstract Carbon dioxide (CO2) pollution is already in a dangerous state. CO2 pollution has an effect on increasing global warming. one of the causes of carbon dioxide pollution is peat soil. Indonesia is one of the countries with the largest peatlands in southeast asia. However, it is still rare to measure CO2 levels in peat soil. For the laboratory scale, this research makes measuring CO2 in peat soil. Measuring instrument of CO2 pollution level there are three parts, gas transmitter CO2 parts, peat soil reservoirs and sensor system. For sensor systems, using mg 811 sensor integrated with arduino and output from sensor in the form of voltage will be processed into PPM (Part Per Million). The method used is CO2 gas will be channeled to peat soil through transmitter and CO2 gas in peat soil will be measured by gas sensor. The result of this research has been made a measure of CO2 on peat soil with a length of 70 cm and width of 40 cm.To detect CO2 gas used mg 811 sensor, gas sensors can be used in the temperature range -20 to 50o C and sensitive at levels of 350 to 10000 ppm. Keywords: mg 811 sensor; CO2; global warming; peat soil; pollution PermaLink | Plain Format | Corresponding Author (Muhamad Haidzar Aziz)

263	ABS-117	Physics
CHARACTERIZATION OF ELECTRIC ENERGY ON MOTOR TO THE LOAD AND CONVEYOR SLOPE Jihan Pratiwi (a*), Ahmad Aminudin (b), Judhistira Aria Utama (b) a)Study of physics, Indonesia University of Education St. Dr. Setiabudhi No.229, Bandung 40154, Indonesia jihanpratiwi36[at]gmail.com b)Faculty of Mathematics and Natural Sciences Education, Indonesia University of Education St. Dr. Setiabudhi No.229, Bandung 40154, Indonesia Abstract Conveyor widely used in the industrial world such in factories which have a function to move goods. The disadvantage of electric energy on conveyor can caused by the load, motor, and time of conveyor operation. This research is focused on efficiency of electric energy on motor conveyor with doing characterization of electric energy on motor to the load and conveyor slope. This research is conducted in order can use electric energy on motor conveyor exactly as needed. Conveyor is made automatic using LDR sensor (Light Dependent Resistor) and laser, in order to save electricity. The conducted method is by transporting load with the variation of angle slope, there are 0, 20, 30, and 40. The result of the research obtained prototype automatic conveyor which equipped with load mass 2kg, 4kg, 6kg, 8kg, 10kg, and 12kg. The relation of electric energy to the transported load at the angle of conveyor slope is the greater angle of the conveyor, so the greater electric energy required Keywords: Characterization of electric energy on motor, automatic conveyor, LDR, laser, load mass, angle slope PermaLink | Plain Format | Corresponding Author (Jihan Pratiwi)

264	ABS-141	Physics
Design of Temperature Measuring Instrument Using NTC Thermistor of Fe2TiO5 Sensor Based on Microcontroller Atmega 328 Siti Sarah Munifah (a*), Wiendartun (a), Ahmad Aminudin (a) a) Physics Program, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia Abstract Thermistor is one of temperature sensor which works based on resistance changes. In a previous study, an NTC thermistor of Fe2TiO5 was made in the form of raw pellet without doping, sintered at a temperature of 1200 \(^{o}\)C for 2 hours in oxygen. A thermistor constant value that obtained from the characterization process is 3642.7 MOhm. This result showed that the thermistor has good quality because it has relatively large constant thermistor. Fe2TiO5 is one of semiconductors that used as basic material for main fabrication component of NTCs as temperature sensor. In this study, temperature measuring instrument using NTC Fe2TiO5 sensor based on microcontroller was made. The NTC is assembled in parallel with a fixed resistor and then assembled on ICLM741 and microcontroller ATMEGA 328. The magnitude of the resistor varies at 1 MOhm, 2 MOhm, and 3 MOhm with each resistor having a tolerance value of 1%. From these variations we get sensitivity value with the value of 0.0026 MOhm/ \(^{o}\)C, 0.0091 MOhm/ \(^{o}\)C, and 0.0155 MOhm/ \(^{o}\)C, respectively. As result, this temperature measuring instrument shows good sensitivity when assembled in parallel using 3 MOhm fixed resistor and capable of measuring the temperature in the range 26.3\(^{o}\)C until 134.5\(^{o}\)C. Keywords: NTC Thermistor; Fe2TiO5; Temperature Sensor; Sensitivity; Temperature Range PermaLink | Plain Format | Corresponding Author (Siti Sarah Munifah)

265	ABS-156	Physics
Classification of Tomato Maturity Level with Light Reflection Method using LDR Sensor Muhammad Hafizhankarim Wachid (a), Lusianti Surya Ningsih (a), R. Silvia Putri Raharja Effendi (a), Dian Ahmad Hapidin (a,b), Khairurrijal Khairurrijal (a,b) a)Department of physics, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia b) Research Center for Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Abstract Tomato is one of the most popular plants in home-scale plantations because it is relatively easy to grow especially in tropical climates. Tomatoes production and distribution are high but the process of maturity is quick. Farmers require to classify the level of tomato maturity accurately in order to reduce the risk of decay during the distribution and storage process. Many tomato maturity classification methods utilize reflected light such as Linear Discriminant Analysis (LDA), Color Blob, Learning Vector, and Artificial Neural Network (ANN). However, these methods have disadvantages in cost, complicated data processing, and time of processing data. Therefore, a low cost and reliable system for classifying the tomato maturity is needed. This paper discusses a system to classify tomato maturity with light reflection using light dependence resistor (LDR) sensor. The tomato maturity classification was based on reflected light received by the LDR with the light source was from red-green-blue (RGB) LED. LDR and LED were covered with a non-transparent black container to isolate the sensor from ambient light. The light emitted from the LED would be reflected by the tomato skin, then the reflected light was captured by the LDR. LDR was connected to a circuit containing a Wheatstone bridge and a differential amplifier with an output connected to Arduino module. The LDR resistance will change followed by the change in the output voltage of the Wheatstone bridge, which will be amplified by the differential amplifier. In this study, we used the method of comparison of experimental results with the results of reference color measurements that printed on paper. This method is able to classify the maturity of tomatoes into 6 level based on United States Standards for Grades of Fresh Tomatoes. There are red, light red, pink, turning, breakers, and green. Experimental data and reference data were obtained with the same pattern for each level of maturity. This device has a high precision with output standard deviation of 0.0786 V for red reflection, 0.0375 V for green reflection, and 0.0033 V for blue reflection. A light reflecting method using LDR sensor is good enough for the classification of tomato maturity level. The instrument design allowed the measurement result unaffected by the intensity of ambient light so that higher accuracy and precision can be achieved. Keywords: Tomato; Light reflection; LDR sensor; RGB PermaLink | Plain Format | Corresponding Author (Muhammad Hafizhankarim Wachid)

266	ABS-162	Physics
Design and manufacture of characteristic test instrument for NTC thermistor sensor based microcontroller ATmega328 Robby Salam, Wiendartun, Ahmad Aminudin Physics Program, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia Abstract Testing of sensor characteristic is important in the design and manufacture of instrumentation system. NTC thermistor sensors are sensors that often used in the manufacture of measuring tools or control system of temperature. Nowadays, NTC have developed in various materials and forms. All of the NTC sensors that are made, require a characterization process to know the electrical characteristics, i.e. the relation between temperature and resistance of the NTC. Manual characterization process is complicated, takes a long time and the result are uncertain accuracy and precision. In this study, an NTC sensor characteristic test instrument was made. The test instrument can make the characterization process simpler and take a shorter time. The characterization test instrument was made with length, width and height of 200 mm, 100 mm and 100 mm respectively. The test instrument can be used to characterize any thermistor with shape of pellet with a maximum 5 mm of thickness and 12 mm of diameter. This instrument can use to characterize in temperature range 25 \(^{o}\)C to 300 \(^{o}\)C. Keywords: Characterization; NTC Thermistor; Test Instrument PermaLink | Plain Format | Corresponding Author (Robby Salam)

267	ABS-163	Physics
THE EFFECT OF TEMPERATURE ON 3D ROCK STRUCTURE OF ANDESITE ROCK SAMPLE TAKEN FROM POTENTIAL GEOTHERMAL AREA, SULAWESI-INDONESIA Mardiannisa Fitri (a*), Lilik Hasanah (a), F.D.E Latief (b,c) , Selly Feranie (a) a. Digital Rock Physics and Soil Mechanical Laboratory, Departement of Physics Education, Indonesia University of Education, Jalan Dr. Setiabudhi 229 Bandung 40154, Indonesia *mardiannisaf[at]gmail.com b. Laboratory of Porous Medium and Fluid Dynamics, Physics Earth and Complex System, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia c. Laboratory of Micro-CT, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Abstract Keywords: pore structure, mineral structure, fractal dimention, permeability PermaLink | Plain Format | Corresponding Author (Mardiannisa Fitri)

268	ABS-164	Physics
CITRUS RETICULATA SORTATION SYSTEM BASED ON WEIGHT, SIZE AND COLOR USING LOAD CELL SENSOR, ULTRASONIC SENSOR AND WEBCAM WITH MATLAB AND ARDUINO BASED Siti Marya Darmawati(a*), Waslaluddin(a), Yuyu Rachmat Tayubi(a) a) Departement of Physics Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia * sitimaryadarmawati[at]gmail.com Abstract Sensor and image processing is frequently used on crop quality control process, among others is on citrus reticulata. The weight, the size and the color of this fruit are some of the factors being monitored on sortation process. From these factors, citrus quality and class can be determined. A system consisting of load cell sensor, ultrasonic sensor and webcam camera is designed to determine the quality of a citrus based on its weight, size and color. This system using Matlab as image data processor to find out the ripeness level based on the surface area of yellow color region of the fruit. The greater surface area indicates the fruit is getting ripe. These three factors are compared to the estimated criteria to classify the fruit class. The result of experiment revealed that system can measure weight and size of citrus then classify citrus to its suitable class. The result of image processing shows that the value of surface area is increasing due to the enlargement of the yellow color region of the fruit. Keywords: Citrus Reticulata, Load Cell Sensor; Ultrasonic Sensor; Image Processing; Sortation. PermaLink | Plain Format | Corresponding Author (Siti Marya Darmawati)

269	ABS-165	Physics
Analysis of Complexity of the Connected Pore Structure 3D Porous Medium using Tortuosity and Permeability Nur Rahmi (a*), Fourier Dzar Eljabbar Latief (b), Selly Feranie (a) a) Digital Rock Physics and Soil Mechanical Laboratory, Department of Physics Education, Indonesia University of Education, Jalan Dr. Setiabudhi 229 Bandung 40154, Indonesia b) Rock Physics and Complex System Laboratory, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia Abstract The complexity of the connected pore structure of porous medium samples has been analyzed using tortuosity and permeability parameter. In measuring the tortuosity and absolute permeability in this porous medium samples, porosity is made equal to four models, which is 15%. Porous medium samples are arranged by placing grains of varying radius (10, 15, 20, 25 pixels) that are randomly distributed and overlapping in a 200 x 200 x 200 medium. The fluid flows of the rock models were analyzed on the y-direction. Connected pore tracing for porous medium was done using the Simple Neurite Tracer which produces the coordinate of the connected pore path which is then used to calculate the value of tortuosity. Tortuosity is calculated by using the definition of the ratio between the sum of the curvaceous angles of the connected pore path to the distance between two facing sides of the sample. Absolute permeability is calculated by using Lattice Boltzmann Method. For four sample models, it was found that tortuosity value is inversely proportional to the permeability value. Keywords: Tortuosity; Permeability; Simple Neurite Tracer; Porous Medium PermaLink | Plain Format | Corresponding Author (Nur Rahmi)

270	ABS-167	Physics
Velocity measurements using LDR Sensor Khairurrijal Khairurrijal (a,b), Dian Ahmad Hapidin (a), Abas Syahbana (a), Fery Krisnanto (a), Muhamad Zia Pratama Hernawan (a), Muhammad Isro Fiordi (a) a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia b) Research Center for Bioscience and Biotechnology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia Abstract Velocity is a physical quantity that is widely used in everyday life. The adverse utilization of the quantity makes the methods and measurement devices are necessary. The most common methods to obtain velocity is by measuring distance traveled by an object in a spesific interval of time. Another way to do this, one could take an advantage from any material that could interact with light in such way there exist a change of physical quantity when the intensity of light modified. This velocity measuring devices work by utilizing the sensor response when an objects pass through it. The commonly used sensors are infrared sensors. By observing the start and end times, at least two such sensors are required in the speed measurement. One sensor that can substitute infrared sensors also rarely used in the velocity measurement is the LDR. LDR is an electric component which its resistance value rises if the intensity of the light on it decreases. This means that the resistance will increase if any object passes through a light-illuminated LDR. In this paper, we discuss velocity measurement using single LDR sensor. To observe the start-finish response, the light sensitive part of LDR sensor will be partially covered (1 x 2.1 cm2), allowing single LDR sensor to detect the velocity of an object. The response of the sensor design will be seen in the graph of the voltage-time graph reading from the bridge circuit and the signal conditioning. In the experiments that performed, the sensor is passed by an objects of different sizes (3.5 x 5.1 cm2 and 3.5 x 0.35 cm2). This size differences produce different outputs. So that the effect of the object size to the device responses can be analyzed. In addition, by placing the cover that unequally divided the LDR light-sensitive part, the object motion direction could be predicted from the time-voltage graph pattern. By applying graph pattern analysis algorithms to the processing unit, the device can be used to measure both speed and motion direction of the object. The resulting output signal depended on the size of the object passing through the sensor, the size of the LDR, and the LDR cover size. Keywords: Velocity; Measurement; Electronic circuit; LDR PermaLink | Plain Format | Corresponding Author (Muhammad Isro Fiordi)

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