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All Journal Jurnal Sains Materi Indonesia TELKOMNIKA (Telecommunication Computing Electronics and Control) Bulletin of Electrical Engineering and Informatics Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Indonesian Journal of Science and Technology ELECTRANS Pedagogia: Jurnal Pendidikan Momentum: Physics Education Journal JITTER (Jurnal Ilmiah Teknologi Informasi Terapan) CARADDE: Jurnal Pengabdian Kepada Masyarakat Journal of Educational Research and Evaluation TELEKONTRAN: Jurnal Ilmiah Telekomunikasi, Kendali dan Elektronika Terapan Journal of Vocational Education Studies (JOVES) Industrial Research Workshop and National Seminar Indonesian Journal of Physics (IJP) Wahana Fisika : Jurnal Fisika dan Terapannya Jurnal Elektronika dan Telekomunikasi
Budi Mulyanti
Universitas Pendidikan Indonesia
Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Other

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N-Type Conductivity in Wurtzite Mn-Doped GaN thin Films Grown by Plasma Assisted MOCVD Budi Mulyanti; Agus Subagio; Edi Supriyanto; Heri Sutanto; Fitri Suryani Arsyad; Pepen Arifin; Maman Budiman; Mohamad Barmawi
Jurnal Matematika & Sains Vol 11, No 2 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

Ferromagnetic semiconductor GaN:Mn thin films were successfully grown by plasma-assisted metalorganic chemical vapor deposition (PA-MOCVD) method on c-plane sapphire substrate. The films were grown at various Mn source flux in the range of 5 - 40 sccm and growth temperature which was lower than that of MOCVD themal, i.e. in the range of 625-700 °C. Cyclopentadienyl manganese tricarbonyl (CpMnT) was used as a source of Mn. X-ray diffraction patterns confirmed that GaN:Mn films are wurtzite and do not show second phase for film with Mn concentration up to 6.4% at 650 °C of growth temperature. Hall effect measurements show n-type characteristics. The carrier (electron) density tends to decreases and Hall mobility tends to with the increase of Mn concentration is increased. Hysteresis curves observed from VSM measurements indicated that all of the samples are ferromagnetic at room temperature.
Pengaruh Bentuk dan Fluktuasi Ukuran Dot terhadap Pelebaran Garis Spektral Inhomogen pada Quantum Dot Gallium Nitrida (QD GaN) Fitri Suryani Arsyad; Budi Mulyanti; Amiruddin Supu; Moehamad Barmawi
Jurnal Matematika & Sains Vol 12, No 4 (2007)
Publisher : Institut Teknologi Bandung

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Abstract

Theoretical analysis of the phenomena of the size fluctuation in Gallium Nitride quantum dot (GaN QD) is presented inthis paper. The effect of QD size fluctuation on the electron and hole energy level and the inhomogeneous linebroadening is studied. Analytical expressions for the inhomogeneous line broadening are derived for a Gaussian sizefluctuation distribution. Decreasing in the QD carrier energy level is observed when QD size increases. The peak ofoptical transition energy probability (Emax) is shifted to higher energy when dot size fluctuation (σL) increases. Theoptical transition energy distribution (fE) of cylindrical QD is at the higher energy with the inhomogeneous linebroadening (σE) wider than those of conical, ellipsoidal, as well as semi ellipsoidal QD.
Distance Learning in Vocational High Schools during the COVID-19 Pandemic in West Java Province, Indonesia Mulyanti, Budi; Purnama, Wawan; Pawinanto, Roer Eka
Indonesian Journal of Science and Technology Vol 5, No 2 (2020): IJOST: VOLUME 5, ISSUE 2, 2020
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v5i2.24640

Abstract

This study aims to investigate (1) the availability of learning facilities for distance learning (or online learning), (2) the ability of students and teachers to utilize the learning facilities, and (3) how distance learning activities take place at public or private vocational high schools, specifically whether it is perceived to be more interesting than ordinary learning. This study used a survey method to obtain data and a quantitative descriptive method to analyze the data. The type of data in this study was primary based on the responses of respondents or individuals from groups representing the population of public and private vocational high schools, especially in the Electrical Engineering Clusters in the entire areas of West Java. The results revealed that online learning has been carried out in many public and private vocational high schools in West Java. This study indicates that the availability of online learning facilities, the utilization of facilities, and the online learning process in public vocational high schools were better than those in private vocational high schools. In general, students of both public and private vocational high schools stated that online learning is not more interesting than ordinary learning, although most of them can understand the lessons taught and they were given an opportunity by their teachers to actively participate during the learning process.
A Design and performance analysis of a telemetry system for remote monitoring of turbidity of water during the COVID-19 pandemic Hasanah, Lilik; Hakim, Wahyu Luqmanul; Aminudin, Ahmad; Sahari, Siti Kudnie; Mulyanti, Budi
Indonesian Journal of Science and Technology Vol 5, No 2 (2020): IJOST: VOLUME 5, ISSUE 2, 2020
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v5i2.24705

Abstract

A turbidity telemetry system for COVID-19 pandemic situations using nRF24L01+transceiver and SEN0189 water turbidity sensor-based microcontroller has been successfuly  developed.. The method used to characterize the sensor is by comparing sensor output voltages with the value of water turbidity. Turbid water used was created by adding distilled water with a concentration of sediment obtained from the filtered sediment with less than 60 μm in diameter. Data transmission performance for various transmit power was done by calculating the error percentages by comparing the number of messages sent by transmitter and received by receiver. The transmit power settings were 0, -6, -12, and 18 dBm and variations in the distance of data transmission from 10 to 80 m. The test results show that the water turbidity sensor has a good measurement range in measuring turbidity of water from 1.873 to 3500 NTU. Higher concentrations of sediment and turbidity of the water made the sensor output voltage decrease. There was a decrease in output voltage in the value, namely -0.0006 in turbidity sensor sensitivity. The results also show an increase in error percentages as the distance of data transmission increases, while the bigger the transmit power is used for data transmission, the smaller the percentage of errors occurs.
Low-Cost Fiber Optic Chemical Sensor Development for Fishpond Application Budi Mulyanti; Yuski Maolid Rizki Faozan; Ajuni B. Pantjawati; Roer Eka Pawinanto; Lilik Hasanah; Wahyu Sasongko Putro
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 6: December 2018
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v16i6.10493

Abstract

In this study, aimed to develop low-cost sensor based on fiber optic to assess ammonia index for fishpond application. Here, the simple design was proposed by using Evanescent wave type to assess ammonia index during acid rain event. The experiment result showed maximum absorption loss with variation ammonia mass 1~5% with wavelength 1310 nm from Optical Light Source (OLS) is 27.56 dBm while Optical Spectrum Analyzer (OSA) reached 25.86 dBm. We had calculated RMSE, MAE, and Percent Error (PE) value both of the device (Low-cost fiber optic chemical sensor and OSA) are 1.692%, 0.916%, and 98.833% respectively. A good result from low cost fiber optic chemical sensor has successful developed with lowest production less than 1,455 USD per-year.
Simple, Easy-use and Low-cost Software for Design of Single and Cascaded Microring Resonators Using Semi-numerical Method Budi Mulyanti; Lilik Hasanah; Tommi Hariyadi; Arjuni B Pantjawati; Heru Yuwono; P. Susthita Menon; Sahbudin Shaari
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 13, No 3: September 2015
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v13i3.1733

Abstract

Development of a simple, easy and low-cost software for designing of waveguide-coupled single and cascaded microring resonator (MRRs) using semi-numerical calculation based on transfer matrix method (TMM), is presented in this paper. The software uses a device model which is embedded on the high index contrast (HIC) structure of silicon-on-insulator (SOI) with monomodal cavity for TE-mode polarizations, operating around 1550 nm optical wavelength. The main aim of the software is to estimate the microring resonator performance parameters, such as free spectral range (FSR) and quality factor (Q-factor). The software is very simple and easy to use. With a standard laptop computer, it only takes few seconds to obtain transmission response, FSR and Q-factor of single MRR for varied waveguides separation distance and ring radius. The results were then verified using simulation method based on finite integration technique using 3D electromagnetic simulator, which need a high memory and processor of computer and take days to execute the simulation. We found only small discrepancy, which in averages are about 4.25% and 10.80% for FSR and Q-factor, respectively. In general, the results obtained from this software are closer to 3D electromagnetic simulation results.
SIFAT STRUKTUR SEMIKONDUKTOR FEROMAGNETIK GaN-Mn YANG DITUMBUHKAN DENGAN METODE PA-MOCVD Budi Mulyanti; Mujamilah Mujamilah; A. Subagio; F. S. Arsyad; Sukirno Sukirno; M. Barmawi; M. Budiman; P. Arifin
Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (169.5 KB) | DOI: 10.17146/jusami.2006.0.0.5184

Abstract

SIFAT STRUKTUR SEMIKONDUKTOR FEROMAGNETIK GaN-Mn YANG DITUMBUHKAN DENGAN METODE PA-MOCVD. Semikonduktor feromagnetik film tipis GaN-Mn yang ditumbuhkan dengan metode Plasma-Assited Metalorganic Chemical Vapor Deposition (PA-MOCVD) di atas substrat safir bidang-c. Efek inkorporasi Mn dalam film tipis GaN-Mn terhadap sifat struktur dan magnetik akan dibahas dalam makalah ini. Trimethylgallium (TMGa), nitrogen (N2) dan Cyclopentadienyl Manganese Tricarbonyl (CpMnTc) masing-masing digunakan sebagai sumber Ga, N dan Mn, dan gas hidrogen digunakan sebagai gas pembawa untuk TMGa dan CpMnT. Penumbuhan dilakukan dengan cara memvariasikan suhu penumbuhan, rasio fluks V/III dan fraksi molar Mn/Ga masing-masing dalam selang 625 oC sampai dengan 700 oC, 440 sampai dengan 1080, dan 0,1 sampai dengan 0,6. Pola difraksi sinar-X dari film tipis GaN-Mn yang ditumbuhkan pada suhu 650 oC memperlihatkan satu puncak GaN-Mn (0002) untuk konsentrasi Mn 6,4 % yang mengindikasikan bahwa film ini berorientasi kristal tunggal. Sementara pada suhu yang lebih tinggi (Tg = 700oC) diperoleh fase kristal tunggal untuk film dengan konsentrasi Mn 3,2 %. Harga konstanta kisi dan FWHM (Full-Width at Half Maximum) dari film kristal tunggal sangat bergantung pada konsentrasi Mn. Hasil pengukuran magnetisasi film GaN-Mn menunjukkan perilaku histeresis pada suhu kamar. Harga momen magnetik per atom Mn tertinggi diperoleh sampel dengan konsentrasi Mn 2,5 %. Kenaikan konstanta kisi pada konsentrasi Mn di atas 2,5% bersama-sama dengan penurunan momen magnetik mengindikasikan bahwa harga solubilitas Mn maksimum mensubstitusi Ga dalam GaN-Mn adalah sebesar 2,5 %.
Rancang Bangun Antena Unidirectional Ultra-Wideband dengan Desain Fork-Shaped Tuning Stub menggunakan Bahan Dielektrik Fr-4 Yusron Tri Huda; Tommi Hariyadi; Budi Mulyanti
ELECTRANS Vol 14, No 1 (2016): Volume 14, Nomor 1, Tahun 2016
Publisher : Universitas Pendidikan Indonesia

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Abstract

In this paper, Ultra Wide Band (UWB) mictrostrip antenna was designed for through-wall-imaging radar. The simulation was carried out using CST Studio. The FR-4 substrate with dielectric constant of 4,3 and thickbess of 1,6 mm is used in this project. The simulation result confirm that antenna have 4,8 GHz of bandwidth from 4,2 to 9 GHz with -10dB return loss. The measured result confirm that antenna have 5 GHz bandwidth from 3,8 to 8,8 GHz with a same return loss.
ANTENA MIKROSTRIP MONOPOLE PITA LEBAR SEGI EMPAT UNTUK APLIKASI DVB-T Ratna Nurvitasari; Tommi Haryadi; Budi Mulyanti
ELECTRANS Vol 13, No 2 (2014): Volume 13, Nomor 2, Tahun 2014
Publisher : Universitas Pendidikan Indonesia

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Abstract

Pada makalah ini dilakukan perancangan dan fabrikasi antena mikrostrip monopole berbentuk segi empat untuk aplikasi Digital Video Broadcasting-Terestrial (DVB-T) pada frekuensi 478-694 MHz. Sebelum fabrikasi, terlebih dahulu dilakukan simulasi menggunakan perangkat lunak 3D Electromagnetic Simulator. Berdasarkan hasil simulasi, nilai return loss kurang dari -10 dB diperoleh  pada rentang  frekuensi 478-882 MHz, gain antena sebesar 1-3 dBi, dan pola radiasi omnidirectional. Fabrikasi Antena mikrostrip menggunakan substrat FR-4 dengan konstanta dielektrik 4,65 dan tebal 1,6 mm. Hasil pengukuran menunjukkan bahwa antena ini dapat diaplikasikan untuk DVB-T di Indonesia.
RANCANG BANGUN BAND PASS FILTER MIKROSTRIP HAIRPIN DENGAN OPEN STUB DAN DEFECTED GROUND STRUCTURE (DGS) UNTUK FREKUENSI UMTS 3G (1920-1980 MHz) Agus Setiawan; Tommi Haryadi; Budi Mulyanti
ELECTRANS Vol 13, No 2 (2014): Volume 13, Nomor 2, Tahun 2014
Publisher : Universitas Pendidikan Indonesia

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Abstract

Pada penelitian ini telah dirancang Band Pass Filter (BPF) dengan frekuensi tengah 1950 MHz. Disain BPF dilakukan pada saluran mikrostrip dengan open stub dan defected  ground  structure (DGS) menggunakan metode hairpin. Simulasi dilakukan dengan menggunakan CST Studio Suite 2012 pada substrat rogers RT5880 yang memiliki permitivitas relatif 2,2 dan ketebalan 1,58 mm. Hasil simulasi BPF menggunakan elemen chebyshev orde ke empat menunjukan BPF memiliki bandwidth sempit dan terjadi sedikit peningkatan return loss. Sementara itu, hasil simulasi BPF  yaitu frekuensi kerja 1918-1979 MHz, insertion loss -1,3 dB, return loss -10,82 dB, impedansi karakteristik 50,3 ohm,dan bandwidth 61 MHz. Sedangkan  hasil pengukuran menunjukan bahwa frekuensi kerja 1926-1986 MHz, insertion loss -1,7 dB, return loss -19 dB, VSWR 1,28, dan bandwidth 60 MHz.
Co-Authors A. Subagio A. Subagio ACHEAMPONG, KENNEDY Ade Gafar Abdullah, Ade Gafar Ade Gaffar Abdulah Adjei, Albert Agus Subagio Ahmad Aminudin Aip Saripudin Ajuni B. Pantjawati Al Husaeni, Dwi Fitria Amiruddin Supu Ampimah, Benjamin Chris Andi Suhandi Andrivo Rusydi Apri Wiyono Arjuni B Pantjawati Arjuni Budi Pantjawati Asep Barnas Simanjuntak Ayub Subandi Baiquni, Muhammad Azhar Bambang Trisno Bonsu, Prince Osei- Brian Yuliarto Budi, Agus Heri Setya Chandra Wulandari Dadang Lukman Hakim Dedi Rohendi Edi Supriyanto Eka Fitrajaya Rahman Eka Pawinanto, Roer Elih Mulyana, Elih Enjang Akhmad Juanda F. S. Arsyad F. S. Arsyad Fauzan, Jahril Nur Febriana, Iqbal Fitri S. Arsyad Fitri S. Arsyad Fitri Suryani Arsyad Henny Henny Heri Sutanto Heru Yuwono Ida Hamidah Ida Hamidah Ida Hamidah Iqbal Febriana Irzaman, Irzaman Jumril Yunas Jumril Yunas, Jumril Kardiawarman Kardiawarman Khoeriah, Ira Herli Lala Septem Riza Lia Muliani Lia Muliani Lilik Hasanah Luqmanul Hakim M. Barmawi M. Barmawi M. Barmawi M. Barmawi M. Budiman M. Budiman Maman Budiman Mariya Al Qibtiya Markus Diantoro Moehamad Barmawi Mohamad Barmawi Muhammad Fadli Nasution Mujamilah Mujamilah Nada Sadidah Naftalia Trivenia Simbolon Nurhidayatulloh Nurhidayatulloh Nurhidayatulloh, Nurhidayatulloh Oduro-Okyireh, George Oduro-Okyireh, Theodore P. Arifin P. Arifin P. Arifin P. Susthita Menon Pangestu, M. Assadillah Pepen Arifin Pratiwi Pratiwi Rafi Jatnika Ramdhani Ramdhani Ratna Nurvitasari Rifqi Md Zain, Ahmad Roer Eka Pawinanto, Roer Eka Sahari, Siti Kudnie Sahbudin Shaari Setiawan, Agus Setyo Nugroho, Harbi Silmi At Thahirah Al Azhima Soegianto S Sri Jatno W Sri Jatno W Sugandi, Gandi Sukirno Sukirno Sulistiyono, Yakub Eriyanto Supriyadi, Tata Tommi Hariyadi, Tommi Tommi Haryadi Tommi Haryadi Tuti Suartini U. Hashim Wahyu Sasongko Putro Wawan Purnama Wawan Purnama Widyaningrum Indrasari Wulandari, Chandra Yadi Mulyadi Yuski Maolid Rizki Faozan Yusron Tri Huda Z. Jamal