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All Journal International Journal of Electrical and Computer Engineering Indonesian Journal of Geography Jurnal Ilmu Dasar POSITRON Jurnal Sains Materi Indonesia Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) JOURNAL AGRIBUSINESS Jurnal VOK@SINDO Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences JFA (Jurnal Fisika dan Aplikasinya) Jurnal Spektra JOURNAL ONLINE OF PHYSICS Science and Technology Indonesia JOIV : International Journal on Informatics Visualization Journal of Science and Applicative Technology Neutrino Jurnal Otomasi Kontrol dan Instrumentasi Jurnal Ilmu Fisika JURNAL METEOROLOGI DAN GEOFISIKA Jurnal Review Pendidikan dan Pengajaran (JRPP) Risalah Fisika Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Sainstek : Jurnal Sains dan Teknologi Community Development Journal: Jurnal Pengabdian Masyarakat Pillar of Physics: Jurnal Berkala Ilmiah Fisika PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Indonesian Journal of Physics (IJP) Newton-Maxwell Journal of Physics

Mitra Djamal

Institut Teknologi Bandung

Author-ID : 254743

Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

Published : 51 Documents Claim Missing Document

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Development of Visible Light Absorption Measurement for Concentrated Dye Solution based on Attenuated Total Reflection Technique and Improvement on its Analysis Method Hendro Hendro; Mitra Djamal; Wirawan Wirawan; Rahmat Hidayat
Indonesian Journal of Physics Vol 19 No 2 (2008): Vol. 19 No. 2, April 2008
Publisher : Institut Teknologi Bandung

An absorption measurement working in ATR (Attenuated Total Reflection) mode has been design for characterization of concentrate dye solution. The system consists of a visible light system as polychromatic wave source, an ATR plate made up from glass or polymer, a spectrometer with a CCD detector. The system is connected to a computer for measurement and data processing. Some commercial inks measured by this ATR system showed absorption spectra which are in agreement with the color of the inks. The absorption parameter will be determined from the incident and reflection beam intensities measured at incident angle larger than the critical angle. We have also carried out Poynting vector analysis and we will show that the energy flow in the normal direction of the interface is not zero. The energy flow, however, decreases along the normal direction of the interface, indicating energy loss due to light absorption in the sample medium. The amount of energy loss depends on the attenuation index or absorption parameters, which is important for formulating the relation between the measured intensities and absorption parameters.

Parallel Burnup Analysis of Long-life Fast Reactors Using Multi-core Programming Imam Taufiq; Zaki Su'ud; Abdul Waris; Mitra Djamal
Indonesian Journal of Physics Vol 21 No 1 (2010): Vol. 21 No. 1, January 2010
Publisher : Institut Teknologi Bandung

A scalable parallel program for burnup analysis of long-life fast reactor has been succesfully built. The scalability test was conducted by comparing the program performance on dual-core and quad-core platforms. The best speedup gain were 1.72 on dual core 2.0 GHz, 3.58 on quad-core 2.4 GHz and 3.05 on quad-core 3.2 GHz. The slight drop of the speedup on quad-core 3.2 GHz could be well explained in connection with communication-time needed in running parallel version of the program.

Effect of Voltage Bias at MEH-PPV Layer on SPR Wavelength observed during in-situ Measurement Method in Polymer Light Emitting Diode Hendro Hendro; Mitra Djamal; Rahmat Hidayat; Daniel Kurnia; Buchari Buchari
Indonesian Journal of Physics Vol 22 No 1 (2011): Vol. 22 No. 1, January 2011
Publisher : Institut Teknologi Bandung

The shifting of surface plasmon resonance (SPR) wavelength has been observed during in situ measurement in polymer light emitting diode (pLED). Examination is performed using an pLED sample which has an ITO/PEDOT:PSS/MEH-PPV/Au structure. When the voltage bias is increased from 0 to 9 volt the SPR wavelength shifts from 612 nm to 628 nm and the absorption curve shifts to lower absorbance value. From the theoretical analysis, it can be understood that the change of the SPR dip and the absorption curves correspond to the change of dielectric constant of the MEH-PPV layer. These results show that SPR wavelength depends on the metal and air dielectric constant as well as on the MEH-PPV layer. These results also imply that the SPR wavelength being evaluated can be controlled by varying the voltage bias.

Development of a New Data Processing System for Increasing the Accuracy of a Levitation Mass Method (LMM) based Measurement Eko Satria; Hendro Hendro; Yusaku Fujii; Mitra Djamal
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Levitation Mass Method (LMM) is the method as a material tester to evaluate the mechanical response of general objects against impact forces. In this method, a mass is made to collide with material to be tested and the impulse, i.e. the time integration of the impact force, is measured highly accurately as a change in momentum of the mass. To realize linear motion with sufficiently small friction acting on the mass, a pneumatic linear bearing is used. The inertial force acting on the mass is calculated from the velocity of the mass. The velocity is determined, highly accurately by means of measuring the Doppler shift frequency of a laser light beam reflected on the mass using an optical interferometer. To determine the Doppler frequency shift for LMM data processing, the method for estimating the frequency is necessary. Several methods have been developed to estimate the frequency for the LMM data processing with high accuracy, i.e. Zero-Crossing Average Method (ZAM), Zero-Crossing Fitting Method (ZFM), Sine Wave Fitting, and Zero-crossing Sine Wave Fitting. All methods realized using the zero-crossing point of the waveform obtained from the digitizer. A better method to estimate frequency on the digitized waveform will enable higher precision for a more accurate result. In this research, a new method that can improve the accuracy has been developed. The program was developed using data segmentation to obtain the frequency of the digitized waveforms. The developed program has the smallest error ( 1,98 X 10^-10 for N= 200) compare to other methods (2,31 X 10-3 for ZAM; 1,10X10-3 for ZFM; and 8,69 X10-4 for Zero-crossing Sine Wave Fitting).

Preliminary research: Gas mixture flowrate detector based on acoustic measurement Melany Febrina; Eko Satria; Mitra Djamal
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

In preliminary research, a system for detecting the flow rate of the gas mixture (N2 and CO2) has been successfully built using acoustic measurements. This detector consists of a speaker as a transmitter of ultrasonic waves, and 3 microphones as a receiver of the ultrasonic waves. The quantity measured in this detection system test is the phase difference of the ultrasonic waves captured by the left and right microphones. The flow rate of the gas mixture will affect the phase difference value between the left and right microphones. With the increase of the flow rate of the gas mixture, the phase difference between the two microphones will increase. The flowrate range tested was between 0 and 0.8 l/min, with a concentration of 20% CO2 in the gas mixture of N2 and CO2. In testing this detection system, the absolute error is 2,4 10-2 l/min.

Acoustic CO2 Gas Sensor Based on Phase Difference Measurement Melany Febrina; Eko Satria; Mitra Djamal; Wahyu Srigutomo; Martin Liess
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.680

In this research, an acoustic sensor has been successfully built to measure the concentration of CO2 gas in a mixture of gases (N2 and CO2). The nitrogen and carbon dioxide gases used are ultra-high purity (UHP) gas. The measurement parameter used is the speed of sound by utilizing the phase shift between ultrasonic wave signals that are sent and received continuously. The acoustic method in this research is by using the speaker as an ultrasonic wave transmitter, and the microphone as an ultrasonic wave receiver emitted by the speaker on the gas medium. This acoustic phase shift method is very sensitive to be used to determine the speed of sound on a gas medium. From the sensor testing, the sensor has good linearity in detecting changes in CO2 concentration in the gas mixture. The sensor test results have been validated theoretically and obtained an RMS error of 3.36 (3.36% with a maximum concentration of 100%), this proves that the work of the sensor is in accordance with the theory. In addition to theoretical validation, the work of the sensor has also been validated by looking at the direct relationship between sensor input and output through the inverse function, and an RMS error of 3.51 (3.51% with a maximum concentration of 100%) is obtained. From the overall results obtained, the acoustic CO2 gas sensor that is built can detect changes in CO2 concentrations in the gas mixture accurately, fabrication of the sensor is easy to do, and the costs required in the manufacturing process are cheap.

INOVASI PENERANGAN: LILIN SEBAGAI ALTERNATIF ENERGI LISTRIK BERBASIS TERMOELEKTRIK. SEBUAH KAJIAN EKSPERIMENTAL Harapan Marpaung; Mitra Djamal; Linus Pasasa; Alamta Singarimbun; Wahyu Srigutomo; Ni Ketut Lasmia
Jurnal Review Pendidikan dan Pengajaran (JRPP) Vol. 6 No. 4 (2023): Volume 6 No 4 Tahun 2023
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jrpp.v6i4.22628

Teknologi pembangkit listrik berbasis termoelektrik (Thermoelectric Generator /TEG) adalah salah satu metode konversi energi panas menjadi energi listrik secara langsung jika terjadi perbedaan suhu antara sisi panas Th dan sisi dingin Tc antara kedua sisi TEG. Salah satu penyebab perkembangan teknologi termoelektrik belum menggembirakan, karena efisiensi TEG yang tersedia saat ini secara komersil masih relatip rendah, umumnya masih berkisar antara 4 % hingga 5%, dan efisiensinya akan masih berkurang jika sudah menghasilkan listrik. Pemanfaatan teknologi ini masih terbatas pada suhu tinggi (>200 °C) sedangkan untuk suhu rendah (<150 °C) belum banyak menarik minat para peneliti. Karakteristik termoelektrik yang khas yakni sekecil apapun beda suhu antara sisi panas dan sisi dingin pasti akan menghasilkan energi listrik dan dalam penelitian ini akan dikembangkan suatu perangkat yang dapat menghasilkan energi listrik hingga 1 watt dengan sumber panas dari lilin. Pada eksperimen ini akan dikaji bahwa lilin dapat menjadi sumber energi listrik berbasis termoelektrik untuk penerangan masa depan. Tipe termoelektrik yang digunakan pada eksperimen ini adalah TEC1-12706, SP1848 dan TEG1-241-01.4-1.2.

Application of Unmanned Aerial Vehicles for Micro-Small and Medium Enterprises Agricultural in West Java Sawita, I Kadek Agus Sara; Evita, Maria; Kane, Hansel; Rausyanfikr, Fadhil; Djamal, Mitra
POSITRON Vol 12, No 2 (2022): Vol. 12 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Agricultural Micro-Small and Medium Enterprises (MSMEs) play a vital role in maintaining national food security. In terms of sources of economic growth, the agricultural sector is the largest contributor to West Java's economic growth in the first quarter of 2021. The agricultural business sector contributed as much as 0.94%, greater than its contribution in the fourth quarter of 2020 which amounted to 0.39%. MSMEs still have external and internal constraints, especially in terms of financing, product marketing, and lack of access to information. These constraints often hinder MSMEs in developing their business and expanding their market share. From various cases of marketing agricultural MSME products in West Java, it is necessary to implement technology to market agricultural commodities. One of them is a map application, which is useful in providing the location of agricultural MSMEs and how to reach that location from the customer's current location. So that sellers/farmers and buyers can do direct transactions. Therefore, map applications using Unmanned Aerial Vehicles (UAV) can be used as the alternative technology to solve that problem. While, this research only focuses on generating the map. UAV - DJI Phantom 4 Pro has been used in this research to take images at each location of the sample locations. To control the UAV automatically for each mission, it used Pix4D capture flight plans. The data were processed by Agisoft Metashape Professional software. The location of image data collection was carried out in various areas: a building, an open space area and a real small and medium agriculture enterprises location. Two-dimensional maps and 3D maps of these areas have been successfully created. The average RMS error is 0.17 (2.88 pixels) indicating under 1% of the average error.

PEMBERDAYAAN MASYARAKAT NELAYAN MELALUI EDUKASI SAMPAH Ismirawati, Nur; Amir, Ashadi; Pratami Irwan, Irninthya Nanda; Djamal, Mitra; Siti Aminah, Nina
Community Development Journal : Jurnal Pengabdian Masyarakat Vol. 4 No. 6 (2023): Volume 4 Nomor 6 Tahun 2023
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cdj.v4i6.21021

Sampah merupakan salah satu permasalahan yang dihadapi oleh masyarakat. Keberadaan sampah yang tidak dikelola dengan baik dapat memberikan dampak negatif bagi lingkungan. Permasalahan sampah yang dihadapi oleh masyarakat nelayan adalah pencemaran air laut akibat sampah. Sampah plastik dapat menghasilkan mikroplastik yang dapat mengganggu ekosistem yang ada di laut yang akan secara otomatis berdampak bagi kesehatan jika mengkonsumsi ikan dan hewan laut lainnya. Pemahaman masyarakat terkait dengan pengelolaan sampah juga masih sangat minim. Sehingga melalui kegiatan pengabdian kepada masyarakat ini dilakukan edukasi kepada masyarakat nelayan terkait dengan sampah. Kegiatan ini dilaksanakan di Kelurahan Watang Suppa, Kecamatan Suppa, Kabupaten Pinrang terbagi atas dua tahapan utama yaitu observasi permasalahan masyarakat nelayan terkait dengan sampah dan pemberian materi edukasi terkait dengan sampah. Materi yang diberikan berupa pembahasan tentang jenis-jenis sampah, dampak lingkungan yang ditimbulkan akibat sampah dan dampak ekonomi yang didapatkan dari pengelolaan sampah. Masyarakat juga mendapatkan informasi tentang pengelolaan sampah dengan metode 3R Reduce, Reuse, Recycle. Peningkatan kesadaran masyarakat terkait sampah membutuhkan sinergitas antara pemerintah dan perguruan tinggi dalam melakukan edukasi dan pendampingan.

PEMODELAN DINAMIKA SUMBER TEKANAN GUNUNG SINABUNG DENGAN SKEMA INVERSI VERY FAST SIMULATED ANNEALING (VFSA) Kumalasari, Ratih; Srigutomo, Wahyu; Djamal, Mitra; Meilano, Irwan; Gunawan, Hendra
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 1 (2024): JOP (Journal Online of Physics) Vol 10 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i1.36661

Gunung Sinabung mulai erupsi pada tahun 2010 hingga saat ini (2021), berdasarkan hal tersebut maka perlu dilakukan analisis terkait Gunung Sinabung guna memprediksi posisi dan perubahan sumber tekanan dari Gunung Sinabung. Untuk mengetahui kondisi bawah permukaan dari Gunung Sinabung maka dilakukan inversi dari data diatas pernukaan yang dimiliki salah satunya yaitu data GPS (Global Positioning System), yang kemudian dat tren perubahan posisi dari GPS diinversi dengan metode Very Fast Simulated Annelaing (VFSA). Data yang digunakan dalam penelitian ini adalah data pada tahun 2015 hingga 2016 dikarenakan pada tahun tersebut terjadi erupsi yang kontinyu sehingga perubahan data terlihat dengan jelas. Dari hasil inversi diketahui bahwa sumber tekanan pada Gunung Sinabung terletak pada kedalaman dangkal yaitu 0,5km hingga 1,5km dibawah permukaan laut dibawah Gunung Sinabung, dan diketahui juga adanya perubahan sumber tekanan yang fluktuatif yaitu adanya kenaikan dan penurunan perubahan sumber tekanan yang berasosiasi dengan adanya inflasi dan deflasi pada tubuh Gunung Sinabung

Co-Authors Abdul Muid Abdul Muid Abdul Waris Achmad, Fariz Aditya Alviori Ahmad Aminudin Alamta Singarimbun Ambran Hartono Aminah, Nina Siti Ari Setiawan Ashadi Amir Azizah Ghina Arifah Bergita Gela M. Saka Buchari Buchari Costrada, Aldo Novaznursyah Cut Novianti Rachmi, Cut Novianti Dadang Dadang Danang Trihatmoko, Danang Daniel Kurnia Daryono Hadi Tjahyono Dasapta Erwin Irawan, Dasapta Erwin Deddy Kurniadi Deny Juanda Puradimaja Dhani Herdiwijaya Dhani Herdiwijaya Emanuel Sungging Mumpuni Evita, Maria Fatahah Dwi Ridhani Fitrilawati Fitrilawati Freddy Haryanto H Mahfudz Hafizh Prihtiadi Harapan Marpaung Harmadi Harmadi Hendro Hendro Hendro Hendro Hendro Hendro Herlan Darmawan Herman Bahar Hong Joo Kim Hufri Hufri Husein H I Kadek Agus Sara Sawita I Made Astra Iful Amri Imam Suyanto Imam Taufiq Inggi Dwi Putri Irninthya Nanda Pratami Irwan irwan meilano Irzaman, Irzaman Ismail Rizka Pambudi Ivan Limansyah Jakrapong Kaewkhao Jayawarsa, A.A. Ketut Juneman Abraham Juniastel Rajagukguk Juniastel. R Kane, Hansel Khairurrijal Khairurrijal Kim, Hong Joo Kumalasari, Ratih Lia Yuliantini Lia Yuliantini Linus Pasasa M. Barmawi Maman Budiman Maman Budiman Maria Evita Maria Evita Maria Evita Martin Liess Martin Liess Melany Febrina Moch Tanzil Multazam Moh Yasin Mukhlizar, Mukhlizar Mukti, Rino Rakhmata Mulyaningsih, Indrya Murhaban Ni Ketut Lasmia Nina Aminah Nina Siti Aminah Nur Ismirawati, Nur Putra, Heriansyah R. N. Setiadi Rahmat Hidayat Rahmat Hidayat Rahmondia N. S Rahmondia N. Setiadi Rahmondia Nanda Ramli Ramli Ramli Ramli Rausyanfikr, Fadhil Retna Apsari Riko Rakhmat Sanjaya, Yogie Sari, Mona Berlian Sari, Mona Berlian Satria, Eko Sawita, I Kadek Agus Sara Siti Aminah, Nina Sony Wardoyo Sparisoma Viridi Suparno Satira Suprijadi Suprijadi Suprijadi Suprijadi Suryanto, Wiwit Suyatno Suyatno Suyatno, Suyatno Thomas Djamaluddin Togar Saragi Tri Siswandi Syahputra Umiatin, Umiatin Wahyu Srigutomo Wahyudi Wahyudi Widyaningrum Indrasari Wilson Jefriyanto Wirawan Wirawan Wirawan, Rahadi Yudi Nugraha Yuliantini, Lia Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yusaku Fujii Zaki Suud Zannuraini Zannuraini Zul Anwar

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