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All Journal The Journal of Pure and Applied Chemistry Research Journal of ICT Research and Applications Jurnal Spektra Spektra: Jurnal Fisika dan Aplikasinya Jurnal Otomasi Kontrol dan Instrumentasi PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Indonesian Journal of Physics (IJP)
Suprijadi Suprijadi Suprijadi Suprijadi
Physics Department, Faculty of Mathematics and Natural Science, Institut Teknologi Bandung
Aerospace Engineering Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics Other

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PREPARASI DAN KARAKTERISASI SIFAT FISIS ION Nd3+ DIDOPING PADA GELAS Na2O-PbO-ZnO-Li2O-B2O3 Rajagukguk, Juniastel; Simamora, P.; Aminudin, A.; Djamal, M.; Suprijadi, -; Hidayat, R.
Jurnal Spektra Vol 16, No 3 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

AbstrakTelah berhasil dilakukan pembuatan medium gelas dengan komposisi (65-x)B2O3-15Na2O-10PbO-5ZnO-5Li2O (x = 0,05; 0,1; 0,5; 1,0; 2,0 dam 4,0 mol%) dan didoping oleh ion aktif xNd2O3. Melalui pendopingan ion Nd3+ ini diharapkan diperoleh medium aktif berupa gelas yang dapat diaplikasikan sebagai penguat optik atau medium laser untuk rentang panjang gelombang pada near infra red (NIR). Semua senyawa kimia berbentuk serbuk dengan massa total 20 gram dicampur di dalam wadah alumina (alumina crucible) dan dibuat dengan metode melt-quenching. Untuk mendapatkan bentuk dan ukuran yang optimum, maka sampel gelas dipotong menjadi tiga ukuran berbeda yakni: 20 x 10 x 3 mm3, 15 x 5 x 3 mm3 dan 10 x 10 x 3 mm3. Selanjutnya gelas dihaluskan untuk memperoleh permukaan yang rata dan transparansi yang tinggi. Untuk mengetahui performa material, maka dilakukan pengukuran dan perhitungan terhadap sifat fisis antara lain: kerapatan, volume molar, indeks bias, konsentrasi ion Nd3+, refraktivitas molar dan suseptibilitas. Sedangkan suhu transisi di dalam gelas diperoleh dengan menggunakan thermo-gravimetric analysis (TGA). Dari hasil pengukuran di peroleh indeks bias gelas meningkat secara bertahap dari 1,570 untuk gelas undoped menjadi 1.625 untuk gelas 4,0 Nd3+. Kerapatan dan volume molar sampel juga meningkat secara perlahan mengikuti kenaikan konsentrasi ion Nd3+.Kata kunci: ion Nd3+,gelas, didoping, sifat fisis. AbstractGlasses medium with composition (65-x)B2O3-15Na2O-10PbO-5ZnO-5Li2O (x = 0,05; 0,1; 0,5; 1,0; 2,0 and 4,0 mol%) doped by xNd2O3 active ion have been successfully prepared. Through the insertion of Nd3+ is expected to obtain the active medium in the form of glass that can be applied as optical amplifier or laser medium for near infrared (NIR) range. The chemical compounds in this work were used in the powder form with 20 gr total mass mixed in the alumina crucible and prepared by melt-quenching method. Then to obtain the optimum uniform, glass samples were cut into three different sizes 20 x 10 x 3 mm3, 15 x 5 x 3 mm3 and 10 x 10 x 3 mm3. Finally, the glasses were polished to get the flat surface and high transparency. The physical parameters such as density, molar volume, refractive indices, Nd3+ ion concentration, molar refractivity and susceptibility are measured for the observed glass material performance. From the measurement results obtained that refractive indices is gradually increased from 1.570 up to 1.625 refer to un-doped glass to 4.0 Nd3+ glass. Also, density and molar volume of the glasses are slightly increased by following increase of Nd3+ ion concentration.Key words: Nd3+ ion, glasses, doped, physical properties.
Spectroscopic and Radiative Properties of Several Nd3+ Ions in Borate Glass System Juniastel Rajagukguk; M. Djamal; R. Hidayat; Suprijadi Suprijadi; A. Aminudin; J. Kaewkhao
The Journal of Pure and Applied Chemistry Research Vol 5, No 2 (2016)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (842.912 KB) | DOI: 10.21776/ub.jpacr.2016.005.02.265

Abstract

Radiative properties and spectroscopic studies of several Nd3+ doped Borate glass system have been reported. Judd-Ofelt intensity parameter and other parameters like oscillator strength (f), effective bandwidth (Dleff), radiative transition probabilities (AR), stimulated emission cross section (s), branching ratio (bR), radiative lifetime (tR) and  experimental lifetime (texp) for the hypersensitive Nd3+ doped Borate Glass are listed and discussed. The variation of W2 values for the different host matrix are expressed their covalency among Nd3+ ions in the glass matrix. In this study, reported that the hypersensitive transition achieved at 4I9/2 ® 4G5/2, 2G7/2 centered at 580 – 585 nm range.
Optical Properties of Nd3+ Doped Phosphate Glasses at 4F3/2 -> 4I11/2 Hypersensitive Transitions Juniastel Rajagukguk; M. Djamal; R. Hidayat; Suprijadi Suprijadi; A. Amminudin; Yotsakit Ruangtaweep; Jakrapong Kaewkhao
The Journal of Pure and Applied Chemistry Research Vol 5, No 3 (2016)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1181.028 KB) | DOI: 10.21776/ub.jpacr.2016.005.03.266

Abstract

The lasing transition 4F3/2®4I11/2 for Nd3+ doped phosphate glass centered around 1.05 – 1.07mm is referred as hypersensitive transition. The radiative properties such as effective linewidth (Dleff), radiative transition probability (AR), branching ratio (bR), radiative lifetime (tR), quantum efficiency (h) and stimulated emission cross section have been obtained for several phosphate and fluorophosphate glass contained Nd3+. The experimental and calculated oscillator strength were used to analysis Judd-Ofelt parameters (W2, W4 and W6) also to predict the quality of factor c. The phosphate glass material with the approximately 69P2O5-15Na2O-15K2O-1Nd2O3 composition at 4F3/2 ®4I11/2 transition  is suitable for laser medium. The enhanced radiative transition probability as well as branching ratio and stimulated emission cross section in this glass are 3694 s-1, 52% and 8.67 x10-20 cm2 respectively.  As in commercial laser, the magnitudes of the emission cross section in this study achieved in the range 4.0-5.0 x 10-20 cm2.
Improvement of Fluid Simulation Runtime of Smoothed Particle Hydrodynamics by Using Graphics Processing Unit (GPU) Wahyu Srigutomo; Ruddy Kurnia; Suprijadi Suprijadi
Journal of ICT Research and Applications Vol. 11 No. 3 (2017)
Publisher : LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.ict.res.appl.2017.11.3.2

Abstract

This study concerns an implementation of smoothed particle hydrodynamics (SPH) fluid simulation on a graphics processing unit (GPU) using the Compute Unified Device Architecture's (CUDA) parallel programming. A bookkeeping method for the neighbor search algorithm was incorporated to accelerate calculations. Based on sequence code profiling of the SPH method, particle interaction computation "“ which comprises the calculation of the continuity equation and the momentum conservation equation "“ consumes 95.2% of the calculation time. In this paper, an improvement of the calculation is proposed by calculating the particle interaction part on the GPU and by using a bookkeeping algorithm to restrict the calculation only to contributed particles. Three aspects are addressed in this paper: firstly, speed-up of the CUDA parallel programming computation as a function of the number of particles used in the simulation; secondly, the influence of double precision and single precision schemes on the computational acceleration; and thirdly, calculation accuracy with respect to the number of particles. Scott Russell's wave generator was implemented for a 2D case and a 3D dam-break. The results show that the proposed method was succesfull in accelerating the SPH simulation on the GPU.
A Simulation of Fuzzy Logic Based Fuel Control Unit on Aircraft Engine System A Ramaniya; Suprijadi Suprijadi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 1 No 1 (2009): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2009.1.1.2

Abstract

Gas turbine engine plays an important role in many technical area such as aviation engine and power turbine generator. The basic fundamental of this engine is to maintain stability of the engine rotation speed(RPM) during all cycle of engine operation. To control the rpm, a Fuel Control Unit is installed. This device controls the rpm and also the fuel flow consumption through a fuel injector in the combustion chamber. In the past decade, the pneumatic fuel control unit is starting to be replaced by electronic fuel control unit. An electronic fuel control unit is believed to have better performance compared to pneumatic controllers. In this paper, a simulation of a fuzzy logic based fuel control unit on Allison Bendix 250 engine was done using MATLAB 7.0. From this simulation, it can be observed that the fuzzy logic based fuel control unit was able to stabilize the engine under disturbances. Results of this simulation will be discussed in this paper.                                                                                                                                          Keywords: Gas Turbine Engine, Allison Bendix 250, Fuzzy Logic, Fuel Control Unit, RPM, Fuel Flow.
Sistem Kontrol Nutrisi Hidroponik Dengan Menggunakan Logika Fuzzy Suprijadi Suprijadi; N Nuraini; M Yusuf
Jurnal Otomasi Kontrol dan Instrumentasi Vol 1 No 1 (2009): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2009.1.1.6

Abstract

Kadar nutrisi untuk tumbuhan berbeda sesuai dengan usia tumbuhan dan tujuan penumbuhannya. Misalnya pada usia kecambah berbeda kadar nutrisinya dengan saat tanaman sedang berbuah. Hidroponik berbasis aliran nutrisi (Nutritent Film Techniques) sangat tergantung pada kadar nutrisi ini setiap saat jika ingin menghasilkan tumbuhan yang sehat dan menghasilkan buah yang baik. Dalam makalah ini, kadar nutrisi dikontrol menggunakan logika sumir (fuzzy logic), uji coba dilakukan untuk tumbuhan tomat. Keywords: NFT, hidroponik, fuzzy logic
Simulasi Kontrol Temperatur Berbasis Fuzzy Logic Untuk Tabung Sampel Minyak Bumi Pada Metode Direct Subsurface Sampling Irkhos Irkhos; Suprijadi Suprijadi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 4 No 1 (2012): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2012.4.1.5

Abstract

Telah dilakukan simulasi kontrol temperatur untuk model tabung pengambilan sampel minyak bumi pada metode Direct  Subsurface Sampling menggunakan Fuzzy Logic Control (FLC). Temperatur tabung sampel dikontrol agar selalu stabil pada temperatur 50oC. Simulasi didesain menggunakan toolbox fuzzy logic dan matlab simulink. Hasil simulasi menggunakan FLC menunjukkan kestabilan kontrol yang lebih baik bila dibandingkan dengan hasil simulasi kontrol menggunakan metode control PID dan kontrol on/off. Simulasi kontrol menggunakan FLC diperoleh nilai error sebesar 1,153 oC dan settling time sebesar 0,5 s. Simulasi kontrol metode PID diperoleh nilai error sebesar 3,127 oC dengan settling time 4 s, sedangkan simulasi kontrol on-off diperoleh error sebesar 4,248 oC dengan settling time 4 s.Kata Kunci:kontrol temperatur, tabung sampel minyak bumi, Simulasi Fuzzy logic Kontrol
Aplikasi Metoda Random Walks untuk Kontrol Gerak Robot Berbasis Citra R Febriani; Suprijadi Suprijadi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 2 No 1 (2010): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2010.2.1.3

Abstract

Algoritma merupakan bagian penting dalam sistem kontrol robot. Terdapat banyak metode yang biasa digunakan untuk keperluan ini, salah satunya adalah random walks. Metode ini menitikberatkan pada estimasi gerakan berdasarkan bilangan random (acak). Disisi lain aplikasi pengolahan citra masih belum banyak digunakan sebagai alat kontrol. Makalah ini akan membahas model dan simulasi metode random walks untuk kontrol gerak robot pada citra yang sederhana. Kata Kunci:random walks, citra
Alat Ukur Curah Hujan Tipping-Bucket Sederhana dan Murah Berbasis Mikrokontroler Maria Evita; H Mahfudz; Suprijadi Suprijadi; Mitra Djamal; Khairurrijal Khairurrijal
Jurnal Otomasi Kontrol dan Instrumentasi Vol 2 No 2 (2010): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2010.2.2.1

Abstract

Telah dirancang dan dibangun alat pengukur curah hujan tipe tipping-bucket (TB) berbasis mikrokontroler AT89S8252. Alat ini menghasilkan tetesan 0,21 mm untuk daerah tabung kecil terpancang sebagai penerima tetesan (tipping-bucket/TB) dari kerucut penampung air hujan seluas 2837,54 mm2. Untuk mencacah TB-nya, sensor tipe reed switch digunakan dan dibaca oleh data logger berbasis mikrokontroler AT89S8252. Data logger tersebut dilengkapi sebuah real time clock dan komunikasi serial agar dapat mengirimkan data ke komputer. Curah hujan maksimum yang bisa diukur adalah 914,4 mm/jam. Kata kunci: Curah hujan, sensor reed switch, mikrokontroler AT89S8252AbstractA Tipping-bucket (TB) rain gauge using AT89S8252 microcontroller has been designed and built. This device produces 0,21 mm drops of water for the small tube receiver (tipping bucket/TB) from the rain water cone area of 2837,54 mm2. Reed switch sensor is used for sampling TB and the sampling data will be read by data logger system using AT89S8252 microcontroller. Data logger system is provided with real time clock and communication serial for sending the data to the computer. Maximum rainfall that can be measured is 914.4 mm/hr. Keywords: Rainfall, reed switch sensor, microcontroller AT89S8252
Pengembangan Model Pengukuran Intensitas Cahaya dalam Fotometri W Hartati; Suprijadi Suprijadi
Jurnal Otomasi Kontrol dan Instrumentasi Vol 2 No 2 (2010): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2010.2.2.3

Abstract

Cahaya merupakan salah satu besaran fisis yang harus dipahami fenomenanya sejak dini. Pemahaman fenomena fisis di tingkat sekolah menengah pada umumnya berbasis pada teori, dikarenakan kurangnya peralatan eksperimen cahaya yang berharga cukup mahal. Pada penelitian ini dikembangkan model eksperimen pengukuran intensitas cahaya yang menggunakan alat ukur yang dikembangkan secara mandiri. Dengan menggunakan kombinasi Fotosel dan mikrokontroler telah dibangun sistem pengukuran intensitas cahaya dengan kesalahan relatif 3,5% pada rentang pengukuran 100 lux sampai dengan 5000 lux. Kata kunci: intensitas cahaya, fotometri, fotosel, mikrokontroler AbstractLight is one of physical quantities which its phenomena must be introduced from an early age. A theoretical based approach is generally used to teach about lighting phenomena at the junior and high school level, but lack of experiments because of the equipments are quite expensive. This research has developed a light intensity measurement model using the instruments which assembled independently. Light intensity measurement system is built by combination of photocell and microcontroller, and has 3.5% relative error at range 100 "“ 50000 lux. Keywords: light intensity, photometry, photocell, microcontroller
Co-Authors A Ramaniya A. Aminudin A. Aminudin A. Aminudin, A. A. Amminudin Adhitya Alkautsar Ahmad Aminudin Daryono Hadi Tjahyono Deni Kartika Freddy Haryanto Galih Restu Fardian Suwandi H Mahfudz Indra Wahyudin Fathonah Irkhos Irkhos J. Kaewkhao J. Rajagukguk Jakrapong Kaewkhao Juniastel Rajagukguk Juniastel Rajagukguk, Juniastel Juniastel. R Khairurrijal Khairurrijal M Yusuf M. Djamal M. Djamal M. Djamal M. Djamal, M. Maman Budiman Maria Evita Mitra Djamal N Nuraini Nur A. Aprianti P. Simamora P. Simamora, P. R Febriani R. Hidayat R. Hidayat R. Hidayat Rahayu, Mina Ismu Ruddy Kurnia Siti Nurul Khotimah W Hartati Wahyu Srigutomo Yotsakit Ruangtaweep