Indonesia Conference Directory

Corresponding Author
Rindi Wulandari

Institutions
Kelompok Keilmuan Fisika Nuklir dan Biofisika,
Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung,
Jl. Ganesha 10, Bandung 40132, Gedung Fisika FMIPA ITB Indonesia
Email: wulandarindi [at]gmail.com, psidik[at]fi.itb.ac.id

Abstract
PLTN generasi IV adalah reaktor daya hasil pengembangan inovatif dari PLTN generasi sebelumnya yang dikembangkan oleh the Generation IV Forum (GIF) dengan kriteria aspek ekonomi yang tinggi, tingkat keselamatan lanjut, menghasilkan limbah dengan kuantitas yang sangat rendah, dan tahan terhadap aturan NPT. Molten Salt Reactor (MSR) adalah salah satu reaktor nuklir generasi IV yang menggunakan molten salt sebagai bahan bakar dan pendingin, sehingga teknologi yang digunakan berbeda dengan reaktor berbahan bakar padat atau reaktor konvensional. Pada penelitian ini, penulis fokus pada analisis karakteristik sistem keselamatan MSR, dengan menggunakan persamaan poin kinetik dan heat transfer pada teras yang telah dimodelkan dengan pengembangan model matematika untuk MSR. Model ini diaplikasikan untuk analisis karakteristik keselamatan dari the molten salt actinide recycler and transmuter system (MOSART) dengan mensimulasikan kondisi transien dasar yaitu unprotected loss of flow (ULOF) dan unprotected overcooling accident (UOC). Hasil simulasi kecelakaan reaktor adalah distribusi daya dan temperatur pada teras reaktor terhadap waktu dan menunjukkan bahwa desain konseptual MOSART adalah desain reaktor yang stabil secara inheren. Penelitian ini bertujuan untuk memberikan pemahaman dasar tentang karakteristik keamanan MSR.

Keywords
Analsisi Keselamatan, ULOF, UOC, MSR

Topic
Physics

Link: https://ifory.id/abstract/whZFPcr3mDAd

Corresponding Author
Rifqo Anwarie

Institutions
1. Universitas Indonesia
2. Balai Besar Logam dan Mesin

Abstract
Abstrak Studi ini membandingkan hasil pengelasan plat aluminium seri 5083 dengan ketebalan 6 mm menggunakan Friction Stir Welding (FSW) dengan variasi welding speed, yaitu 22, 29 dan 38 mm/menit dan kecepatan rotasi 1555 rpm dengan hasil pengelasan konvensional Gas Tungsten Arc Welding (GTAW). Pengelasan FSW dilakukan dengan menggunakan mesin frais. Hasil FSW dan GTAW diidentifikasi menggunakan uji tarik, uji kekerasan dan analisa struktur mikro. Dari identifikasi Hasil analisa struktur mikro menunjukkan Heat Affective Zone (HAZ) hasil pengelasan FSW lebih kecil dari GTAW sehingga menyebabkan kekuatan tarik dan kekerasan hasil FSW lebih tinggi dibandingkan dengan GTAW. Maka dilihat dari perspektif industri proses FSW sangat kompetitif karena menghasilkan sifat mekanik yang lebih baik dibandingkan dengan proses GTAW.

Keywords
Aluminum Seri 5083, FSW, GTAW, welding speed, ujian tarik, uji kekerasan, struktur mikro.

Topic
Physics

Link: https://ifory.id/abstract/rpJkUTChXKvD

Corresponding Author
Andri Surya

Institutions
1. Universitas Indonesia
2. Balai Besar Logam dan Mesin

Abstract
Studi penelitian ini membandingkan hasil pengelasan ulang (welding repair) antara metode Friction Stir Welding (FSW) dengan Gas Tungsten Arc Welding pada sambungan las Aluminium 5083. Lima pasang sampel Aluminium dilas dengan metode FSW menggunakan mesin frais dengan kecepatan las 29 mm/menit, kecepatan rotasi 1555 rpm dan panjang pin tool 5,0 mm berbentuk silinder berulir. Dua sampel dari hasil pengelasan tersebut dilas ulang dengan metode FSW, dengan satu sampel posisi terbalik. Dua sampel lainnya dilas ulang dengan metode GTAW sebagian dan seluruhnya. Dari identifikasi menunjukkan bahwa kekuatan tarik, kekerasan dan struktur mikro hasil pengelasan FSW lebih baik dari proses GTAW. Hal ini dikarenakan temperatur proses pengelasan FSW lebih kecil dari GTAW sehingga Heat Affective Zone (HAZ) FSW lebih kecil dari GTAW. Hasil penelitian menunjukkan bahwa metode FSW dapat menghasilkan sifat mekanik yang baik pada sambungan las.

Keywords
Aluminum Seri 5083, Friction Stir Welding(FSW), Gas Tungsten Arc Welding (GTAW), ujian tarik, uji kekerasan, struktur mikro

Topic
Physics

Link: https://ifory.id/abstract/m7bAMq4VvLpU

Corresponding Author
Ruly Gumilar

Institutions
1Laboratorium Fisika Nuklir dan Energi,
Kelompok Keilmuan Fisika Nuklir Reaktor,
Fakultas Sains dan Teknologi, Universitas Islam Negeri Sunan Gunung Djati,
Jl. AH Nasution no. 105 Bandung, Indonesia, 40614

2Laboratorium Komputasi,
Pusat Teknologi dan Keselamatan Reaktor Nuklir,
Badan Tenaga Nuklir Nasional,
Kawasan Puspiptek, Gedung 80, Tanggerang Selatan, Indonesia, 15310

a) rulygumilar[at]gmail.com
b) zuhair[at]batan.go.id
c) nsubkhi[at]gmail.com

Abstract
Parameter kinetik reaktor nuklir merupakan salah satu aspek penting dalam analisis keselamatan reaktor nuklir karena berkaitan dengan sistem kontrol. Tiga parameter kinetik yang penting untuk diketahui secara akurat, yaitu fraksi neutron kasip efektif 〖(β〗_eff), waktu generasi neutron rerata (Λ) dan umur neutron serempak (l). Sehingga dalam studi ini dilakukan penghitungan ketiga parameter tersebut dari desain HTR (High Temperature Reactor) pebble-bed dengan memodelkan teras secara homogen untuk fraksi packing dan pengkayaan yang beda. Program transport Monte Carlo MCNPX260 digunakan untuk mendapatkan hasil perhitungan dengan tingkat akurasi yang tinggi. Hasil perhitungan menunjukan nilai parameter kinetik yang termasuk dalam kategori terkontrol dengan nilai β_eff kurang dari 1μs dan nilai error kurang dari 1%

Keywords
parameter kinetik, reaktor nuklir, monte carlo, MCNPX260

Topic
Physics

Link: https://ifory.id/abstract/p4PKDeZvJmfu

Corresponding Author
Anggara Budi Susila

Institutions
Department of Physics, Faculty Mathematics and Natural Science, State University of Jakarta, Jakarta 13220

Abstract
The synthesis of aluminum (Al) alloys, Al-Cu-Mg from mixture powder 88.4 wt% Al; 3.8 wt% Cu and 1.8 wt% Mg the adding 6.0 wt% up to 7.0 wt% of SiC on Al-Cu-Mg. After mixing the sample has been prepared by hot pressing process at a temperature of 350oC. After pressing sample has prepared by sintering one hour at a temperature 500oC and aging 16 hours. Al-Cu-Mg/SiC alloys samples has been investigated. The structure analysis were examined by X-Ray Diffractometer (XRD) and scanning electron microscope (SEM-EDX). The hardness was measured by hardness Vickers method. According to the results, it can be assumed that the 7 wt% of SiC content is prefer content to get better quality of hardness Vickers of Al-Cu-Mg alloys.

Keywords
Al-Cu-Mg/SiC, hot press, XRD, Hardness Vickers

Topic
Physics

Link: https://ifory.id/abstract/zjbvQmxVCeEc

Corresponding Author
Lydia Rohmawati

Institutions
Universitas Negeri Surabaya

Abstract
Nanoparticles CaCO3/MgO by variation percent weight of MgO (5, 21, 22, 23, 24, and 25) wt.% potentially antibacterial can be synthesized by mixing methods and calcination at temperature 800 oC, which synthesis CaCO3 from shell fish (Anadara granosa) using carbonation methods by flow velocity of CO2 gas 2.8 liter/min. The successful nanoparticles were characterized by BET, antibacterial activity and PSA. Variation percent weight of MgO was used to determine pore size, surface area and antibacterial activity on nanoparticles CaCO3/MgO. The results showed that weight percent variation of MgO have different pore size and surface area that are included in the mesoporous category. CaCO3/MgO (5wt.%) has the smallest surface area (3.24 m2/g) and the largest pore size (20.12-29.35 nm), while CaCO3/MgO (24wt.%) has the largest surface area (65.05 m2/g) and the smallest pore size (3.23-3.59 nm) by the closed end of curve. The tip end of curve obtained at the sample CaCO3/MgO (21wt.%) which has the largest antibacterial activity by inhibitor diameter 31.0 mm on Staphylococcus aureus and 33.0 mm on Escherichia coli bacteria. The optimal nanoparticles has particle size <200 nm.

Keywords
synthesis, characterization, nanoparticles, CaCO3/MgO, antibacterial

Topic
Physics

Link: https://ifory.id/abstract/Z34FjypnDW9x

Corresponding Author
anwar dolu

Institutions
Universitas Tadulako, Palu, Sulawesi Tengah
Institut Teknologi Bandung, Bandung, Jawa Barat

Abstract
Tanggap dinamis struktur linier maupun non linier merupakan fungsi dari karakteristik sistem dan fungsi pemaksa beban luar yang bekerja. Tanggap dinamis struktur berupa tipe deterministik dan stokastik berkaitan dengan fungsi pemaksa beban luar yang bekerja. Pemodelan struktur non linier dalam hal ini adalah struktur non linier kekakuan tipe persamaan Duffing. Pada model deterministik, gaya luar pada struktur adalah beban tetap dan sinusoidal (tipe deterministik). Tanggap deterministik dalam hal ini adalah perpindahan x (t) dan kecepatan v(t) . Identifikasi sistem dinamis linier dan non linier dengan tanggap deterministik serta gejala chaos (chaotic) berdasarkan tinjauan sejarah waktu (time history), bidang fase (phase plane), pemetaan Poincare(Poincare map), spektrum Fourier dan diagram bifurkasi. Penyelesaian persamaan diferensial nonlinier ini menggunakan metode numerik Runge � Kutta dengan aplikasi software MAPLE. Pada model stokastik, gaya luar pada struktur adalah beban acak tipe derau putih (white noise). Tanggap stokastik dalam hal ini adalah tanggap perpindahan x (t) dan kecepatan yang berupa nilai rata-rata (mean value), standar deviasi (standard deviation) dan fungsi kepadatan probabilitas (PDF). Penyelesaian persamaan diferensial stokastik ini secara analitik dengan aplikasi persamaan Fokker-Planck-Kolmogorov (FPK) dan secara numerik menggunakan simulasi Monte Carlo dan metode linearisasi statistik (statistical linearization) dengan aplikasi software MAPLE dan MATLAB.

Keywords
Persamaan Duffing, deterministik, chaos, stokastik, Runge-Kutta,time history, Poincare map, Fokker-Planck-Kolmogorov, Monte-Carlo, standar deviasi, PDF

Topic
Physics

Link: https://ifory.id/abstract/gjbh9xkd2Nnq

Corresponding Author
Afendi Fina

Institutions
Fakultas Matematika dan Ilmu Pengetahuan Alam
Universitas Advent Indonesia

Abstract
Produksi susu sapi perah segar perlu terus menerus ditingkatkan mengingat manfaat nutrisinya dan jumlah kebutuhannya yang sangat tinggi serta terus menerus meningkat. Penambahan jumlah sapi perah dan penambahan jumlah peternak telah dilakukan sebagai salah satu solusi untuk mendorong peningkatan kapasitas produksi susu. Namun kendala masih ada yang dihadapi oleh para peternak yaitu susu sapi perah segar yang dihasilkan dalam waktu cepat (hitungan jam) mengalami kebasian sebagai akibat berkembangnya bakteri di dalam susu. Kendala ini berpotensi membuat peternak merugi dan pada akhirnya harus gulung tikar dari usahanya. Ketika telah mengalami kebasian, susu tidak dapat lagi dijual. Peternak belum memiliki solusi sederhana untuk mengatasi hal ini. Suatu pendekatan baru yang sederhana telah dicoba dilakukan, yaitu dengan menyuntikan gelembung udara berdiameter rata-rata dalam orde mikro hingga nano meter dengan kerapatan yang tinggi ke dalam susu. Kehadiran gelembung udara dengan ukuran yang dimaksud dalam jumlah yang sangat tinggi dapat menghasilkan spesies oksidasi berjumlah tinggi pula yang dapat mematikan seluruh mikroorganisme yang ada di dalam susu, termasuk bakteri, sehingga bakteri tidak dapat hidup dan berkembang di dalam susu. Dari data penelitian yang diperoleh menunjukan bahwa bakteri pada susu dapat dibasmi dengan menghadirkan gelembung udara mikro-nano meter. Pendekatan ini tidak melibatkan zat-zat kimia yang bersifat berbahaya dan prosesnya sangat sederhana. Pada paper ini mekanisme penyuntikan gelembung udara yang dimaksud dan fenomena yang dihasilkan terhadap sterilisasi susu, selengkapnya diterangkan.

Keywords
Sterilisasi susu, susu sapi perah segar, gelembung udara mikro-nano meter

Topic
Physics

Link: https://ifory.id/abstract/QYzVGZumKaLD

Corresponding Author
Judhistira Aria Utama

Institutions
a) Department of Physics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia
*j.aria.utama[at]upi.edu
b) Department of Computer Science Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi 229, Bandung 40154, Indonesia

Abstract
Orbital computation of 3,372 real near-Earth asteroids (NEAs) population was conducted and their orbital evolution was recorded every 1,000 years for the next 5 Megayears (Myr). This study is aimed to detect asteroids in 1:1 mean-motion resonance (MMR) with planets. In order to achieve our goal, we employed N-body numerical simulation with the use of Swift-RMVS (Regularized Mixed-Variable Symplectic) integrator. We found that NEAs population could have evolved into asteroids in a co-orbital state with Terrestrial planets (Mercury to Mars). For the detection of this co-orbital condition a time series of motif discovery algorithm known in computer science was applied to asteroids orbital elements. The predicted results of the experiments carried out were then compared with one of the standard tool in astronomy, which showed that our model could prove the location of the motif and the duration of the asteroid in co-orbital state with each Terrestrial planets.

Keywords
Co-orbital state; Motif discovery; Near-earth asteroids; Orbital elements; Time series

Topic
Physics

Link: https://ifory.id/abstract/crY8VdbXGZRt

Corresponding Author
Dyah Marganingrum

Institutions
a) Reserach Centre for Geotechnology – Indonesian Institute of Sciences
b) Kelompok Studi Media Energi Nusantara

Abstract
Bottom ash (BA) is waste categorized as B3 and requires special handling and costs. BA become as an interesting issue since the coal using increase in various industries as a fuel. In another case, municipal solid waste (MSW) generation become the environmental problem in the urban area. This paper aims to utilize these two wastes to products and solution of environmental problems as well. The method used in this study is briquetting from BA and fermented of MSW called Biomassed Coal Fermented (BCF) briquettes. The formulations used 60% BA and 40% MSW. The BCF briquettes were tested in boiler 1 which fixed bed type at the kind textile industry. The results showed that with 10% substitution of BCF briquettes for coal use, combustion efficiency increased by 48%. The measurements of air emissions showed a value below of the air quality standard for particulate, SO2, and NO2. When compared with boiler 2 which is without substitution (100% using coal) the particulates and NO2 increased 28% and 2% respectively then SO2 decreased 67%. This interim trial showed the potential of BCF briquettes can be an alternative fuel while reducing the generation of BA and MSW.

Keywords
air quality standards; bottom ash; emission; fermentation; municipal solid waste

Topic
Physics

Link: https://ifory.id/abstract/b74kxF6Wa2Xr

Corresponding Author
Humaira Ihda Rahmi

Institutions
(a) Fisika, FMIPA, Universitas Negeri Jakarta
*ce.rustana[at]yahoo.com
(b) Fisika, FMIPA, Universitas Negeri Jakarta
(c) Pusat Penelitian Fisika, Lembaga Ilmu Pengetahuan Indonesia

Abstract
In this research to reduce energy consumption of the electrolytic hydrogen production process, on the other hand still increase the efficiency, durability, and safety, we propose a catalyst from CO2 that decrease the use of energy and still produce the same amount of hydrogen. Wherein hydrogen and oxygen is produced from splitting carbonic acid (H2CO3) which comes from mixing CO2 and water (H2O). Based on the research conducted, hydrogen production rate when using CO2 as catalyst in lower voltage variation compensated the higher voltage. The best result regarding CO2 as catalyst after 300 minutes of electrolysis process, the lower voltage generate higher hydrogen volume.

Keywords
Hydrogen; electrolysis; CO2 as catalyst; carbonic acid

Topic
Physics

Link: https://ifory.id/abstract/DqzNAByrkvwR

Corresponding Author
Estiyanti Ekawati

Institutions
(1) Center for Instrumentation Technology and Automation, Institut Teknologi Bandung
(2) Engineering Physics Program, Faculty of Industrial Technology, Institut Teknologi Bandung

Abstract
This paper reports the design and implementation of piezoelectric mat to harvest energy from human walking and jumping activities on the mat. The mat consisted of a rubber mat loaded with an array of piezoelectric chips. These chips produced electrical voltage when receiving a pressure. Connecting these chips to a closed electrical circuit would let the electrical current flows. The current was flown to a rectifier, and the respective electrical charge could be collected in a super capacitor. The module was also complemented with a human machine interface to monitor the capacitor�s voltage. This application was programmed in Java platform and was integrated with a serial communication RS232 and a microprocessor that function as a data acquisition module. Evaluation of the overall module consisted of chip characteristic, capacitor charging and discharging. The chip characteristic test helped to select the piezoelectric type t use underneath the carpet. The selected chips were covered by resin to protect them from excessive pressure. The ability to charge capacitor was tested by performing walking and jumping on top of the carpet in 5 minutes. These activities generated in 1.1V potential at the capacitor. Varying and intensifying these activities produced 3V and managed to light of � Watt LED. On the other hand, the time constant of capacitor discharge was 76.92 minutes.

Keywords
Piezoelectric, Energy Harvesting

Topic
Physics

Link: https://ifory.id/abstract/fbdW2yUMrDjQ

Corresponding Author
nur hidayah

Institutions
1Physics Study Program, Jambi University, Jambi –Ma. Bulian Street KM 15, Mendalo Darat Jambi 36361, Indonesia
2D3 Study Program, Sains Laboratory, Bengkulu University, WR. Supratman Kandang Limun Street, Muara Bangka Hulu Bengkulu 38371, Indonesia
3Chemistry Study Program, Jambi University, Jambi –Ma. Bulian Street KM 15, Mendalo Darat Jambi 36361, Indonesia

Abstract
Temperature control is very prominent to be done in producing biochar, because the quality of biochar depends on combustion temperature and the amount of oxygen existing when the combustion process is happening. In this research, the designing of furnace for biochar production by using vacuum pump and temperature manual control had been done. The fuel used was LPG gas. The furnace was designed by having two parts which are cylinder tube for biochar production and tube feet as the holder of the kiln. The calibration of the furnace for biochar production was done to find out the temperature and the pressure that can be generated and its effect toward produced biochar. The calibration was done by using vacuum pump to vacuum the combustion chamber and temperature manual control as temperature indicator. There were two steps for this furnace calibration, first, the leakage test and second, combustion test of biochar production. The leakage test was done by using bubble test method. The result showed that there were still some leakages happened, but they were fixed with glue on the leak parts. As the final result of the leakage calibration, the vacuum condition obtained was -25 cmHg. And as the result of biochar combustion as long as one and two hour, the temperature reached 2800C and 2500C.

Keywords
Biochar; furnace; temperature control manual;vacuum pump

Topic
Physics

Link: https://ifory.id/abstract/cZ8MNmqu7PGW

Corresponding Author
helga dwi fahyuan

Institutions
1Physics Study Program, Jambi University, Jambi – Ma. Bulian Street, KM 15, Mendalo Darat Jambi 36361, Indonesia
2D3 Study Program, Sains Laboratory, Bengkulu University, WR. Supratman Kandang Limun Street, Muara Bangka Hulu Bengkulu 38371, Indonesia
3Energy and Nanomaterial Laboratory, Jambi University, Tri Brata Street, KM 11 Pondok Meja Mestong, Muaro Jambi, Indonesia
4Chemistry Study Program, Jambi University, Jambi – Ma. Bulian Street, KM 15, Mendalo Darat Jambi 36361, Indonesia

Abstract
Abstract. The biochar/TiO2 thin layer has been made by sol-gel method and the coating technique by Doctor Blade method. The variation of biochar on TiO2 were 0%, 1%, 2%, 3% and 4%. The characterization was done by XRD (X-Ray Diffractometer) to see the crystal structure of samples. Also, the characterization by UV-Vis spectrophotometer to obtain the value of energy gap. Based on XRD data, it was obtained that the crystal structure of all samples is anatase TiO2. The crystalline size of all samples has no significant different by the increasing of percentage doping. The smallest crystal size was at the addition of 3% and 4% biochar which was 118.22 nm. The results of UV-Vis characterization showed the lowest value of energy gap was at sample doping 1% biochar which was 3.25 eV. Bandgap energy value for doping sample above 1% showed an increase of bandgap energy of Biochar-TiO2.

Keywords
biochar/TiO2; bandgap energy; TiO2; Doping

Topic
Physics

Link: https://ifory.id/abstract/kUCGMufPmYgK

Corresponding Author
Iqbal Assidiq

Institutions
UPI

Abstract
Kadidia-Sigi, Central Sulawesis geothermal potential area has impermeable hoods with a high level of clay minerals (illite) in alteration regions around geothermal manifestations. Breccia rock samples were taken from one of the wells that had been analyzed to see the effect of temperature on changes in 3D rock structure. Rock samples were given heat induction treatment with varying temperatures ranging from 24°C (room temperature), 100°C, 150°C, 200°C, to 250°C. Samples at room temperature that have been given treatment are scanned with a Micro-Computed Tomography Scan (µ-CT Scan) instrument. 300 images of the µ-CT Scan results were reconstructed and characterized by 3D changes in the pore structure, minerals, and fractures using digital image processing. The results obtained in the form of pore grain size distribution, mineral grain size distribution and porosity rock size {{(T)}, specific surface area {SsA (T)} which tends to increase polynomially in pore and mineral structures. The results of fracture are obtained in the form of the main parameters, namely aperture {e (T)}, density {? (T)}, and intensity {I (T)}. Changes in micro structure (Nfracture) which is the cause of changes in fractal properties in rock structures. Where fractal changes produce equations that show fractal dimensions as a function of temperature that occurs in the pore structure, minerals, and breccia rock fractures.

Keywords
3D rock structure, treatment of temperature, pore, minerals, fractures, fractal dimensions

Topic
Physics

Link: https://ifory.id/abstract/2nRYBUawF4fb

Corresponding Author
Annamaria Bupu

Institutions
Department of Physics, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia, Depok 16424, Indonesia

Abstract
Anatase TiO2 is one of the most attractive transition metal oxides due to its properties and its potential applications. However, transport properties of this material is still need to be explored. Recent experimental study on this materials shows that carrier concentrations and temperature affects the transport properties of anatase TiO2, but the mechanism that govern the properties have not been explained yet. Thus, in this work we present a theoretical study which investigates the transport properties of anatase TiO2 in order to model the previous experimental results. We hypothesize that electron-phonon coupling with intermediate coupling constant (large polaron) play a role on the transport properties of this material. We use Holstein model of electron-phonon interactions which then solve within Dynamical Mean Field Theory (DMFT). In this model, we tune the electron-phonon coupling constant into a value that represent the large polaron then calculate the transport properties, that is, the temperature dependent resistivity of anatase TiO2.

Keywords
anatase TiO2; large polaron; Holstein Model; DMFT

Topic
Physics

Link: https://ifory.id/abstract/N7DcCjbAvh68

Corresponding Author
Tati Rohayati

Institutions
Faculty of Agriculture, Universitas Garut, Jl. Raya Samarang 52 A Garut, Indonesia, tatirohayati[at]uniga.ac.id

Abstract
This study aims to determine the amount of Indigofera zollingerianaand banana hump that fermented byTrichoderma harzianumas a substitute for soybean meal and rice bran in ration on the physical qualities of pellets. The research method was experimental using a completely randomized design with a factorial pattern consisting of two factors and each five treatment andtwo replications. Experimental data were analyzed by analysis variance, then to find out the differences between treatments were analyzed by Duncans Multiple Range Test. The results showed that there was an interaction between the use of Indigofera zolingeriana and banana hump durability and density of pellet. The highest pellet durability was obtained by using 26% Indigofera zollingeriana and 1.25% banana hump, while the highest pellet density was obtained using 0% Indigofera zollingeriana and 1.25% banana hump.

Keywords
Pellet, physic, durability, density

Topic
Physics

Link: https://ifory.id/abstract/3mNqdb8j7QDn

Corresponding Author
Abdurrohman Abdurrohman

Institutions
a) Politeknik STTT Bandung
Jalan Jakarta No.31 Bandung, Indonesia
*ikhwan10021991[at]gmail.com

Abstract
In the weaving process, weft insertion (picking motion) is a factor of the formation of the fabric. Weft insertion is done by various types of media from shuttle, gripper, water jet, air jet, and the projectile. The use of media types weft insertion affects the speed of fabric production. Air jet is the most popular media in terms of weft insertion, because it has high speed and simple machine construction. In this research it can be shown the modeling of yarn movement during weft insertion on the Air Jet Loom machine from main nozzle until the end of fabric by physics.

Keywords
Air Jet Loom, Weft Insertion, Picking Motion

Topic
Physics

Link: https://ifory.id/abstract/wcV7dHmKq8Uj

Corresponding Author
Arifan Jaya Syahbana

Institutions
a) Department of Civil Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia
* arifanjaya[at]s.itb.ac.id
b) Center for Earthquake Science and Technologi Indonesia, Bandung, Indonesia
c) Research Center for Geotechnology, Indonesian Institute of Sciences, Bandung, Indonesia
d) Department of Ocean Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia
e) Research Center for Disaster Mitigation, Institut Teknologi Bandung, Bandung, Indonesia

Abstract
Special Region of Yogyakarta is one of a big cities in Indonesia which has important meaning from the political, social, economic and cultural aspect. This area is located in a high earthquake hazard zone based on the 2017 Earthquake Hazard Map. This location also mentioned has accelerated bedrock acceleration up to 0.6g. In this study, a re-analysis of PSHA will be carried out using the OpenQuake software with the GEM database and the latest attenuation to see the number of acceleration differences generated in the bedrock. Simulation is done by making two logic tree attenuation scenarios, later called the Pusgen scenario (1) and the Cummins scenario (2). The result of this study is the first scenario will result in an acceleration greater than the second scenario. Bedrock PGA based on Pusgen scenario range from 0.431-0.720g in another hand Cummins scenarios ranges from 0.405 to 0.709g.

Keywords
sensitivity; attenuation; bedrock; PGA; PSHA; Yogyakarta

Topic
Physics

Link: https://ifory.id/abstract/z9mDXEMRFQGp

Corresponding Author
Mutia Delina

Institutions
(a) Physics Department, Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta
Jl. Rawamangun Muka No 1, Jakarta Timur 13220, Indonesia
*mutia_delina[at]unj.ac.id
(b) Educational Physics Department, Faculty of Mathematics and Natural Science. Universitas Negeri Jakarta
Jl. Rawamangun Muka No 1, Jakarta Timur 13220, Indonesia
(c) Ministry of Foreign Affair Republic Indonesia.
Jl. Taman Pejambon No 6. Jakarta Pusat, Indonesia

Abstract
The quantum key distribution provides a secure information exchange. The system employed a photon as the messenger. In this study one-time-pad (OTP) quantum key distribution provide a key which is use one time only. For example, in a war. Therefore, it is not possible to share the secrete key in this condition. This paper discusses the simulation of a one-time pad quantum key distribution.

Keywords
simulation, quantum key, one time pad

Topic
Physics

Link: https://ifory.id/abstract/cZj3AfgNz6Ek

Corresponding Author
Desyani Ambarwanti

Institutions
(1)Program Magister Pendidikan Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun muka no. 01, Rawamangun, Jakarta Timur 13220, Indonesia
(2)Laboratorium kontrol, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun muka no. 01, Rawamangun, Jakarta Timur 13220, Indonesia
(3)Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun muka no. 01, Rawamangun, Jakarta Timur 13220, Indonesia

Abstract
Physics learning is taught to equip students with knowledge and understanding of various natural phenomena. In order to improve comprehensive understanding of waves principle for student class of XI, we implement science, technology, engineering, and mathematics (STEM) in physics learning by using theremin based light dependent resistor (LDR). In this paper, theremin as music instrumental non-contact will be used as teaching aid. Physics understanding of the students will be observe and investigated during a class. Analyses will be focus on adjustment of frequency will provide pitch of tones. As results, by theremin, student will have better understanding of waves principles.

Keywords
Theremin, STEM, LDR, Frequency, waves

Topic
Physics

Link: https://ifory.id/abstract/DRkKLPcdXAHf

Corresponding Author
Dwi Putri Desti Utami

Institutions
a) Physics Study Program, Department of Physics Education, Faculty of Mathematics and Natural Science Education, Indonesia University of Education, Jalan Dr. Setiabudhi, No. 229, Bandung 40154, West Java, Indonesia
*dwiputridu18[at]gmail.com; aaminudin[at]upi.edu; mimin_iryanti[at]yahoo.com

b) Department of Soil Science, Faculty of Agriculture, Tanjungpura University, Jalan Prof. Hadari Nawawi, Pontianak 78124, West Kalimantan, Indonesia

Abstract
Soil takes a big role as a source of excess CO2 gas emissions that can be the cause of global warming, mainly peat soils that contain a lot of organic matter. One of the factors that influence is soil temperature. The research aims to analyze the temperature distribution at the surface of the soil to optimize the detection of CO2 gas sensor for soil by designing an appropriate heating system. The method used is an experimental method. Research using peat soil placed in the chamber, the heater was placed on it, and a number of thermometer-digitals are placed at several points on its surface in the x-axis and y-axis by plotted distance from the heater is 5cm, 10cm, and 15cm. Temperature alterations toward time can be observed by thermometer and stopwatch. The temperature distribution at the surface of soil occurs evenly in the radial direction, and further the distance of soil from the heater, the less its influence toward temperature alteration of soil. At plotted distance of 5cm, the temperature alteration toward time is 0.0019oC/s, at 10cm is 0.0004oC/s, and at 15cm is 0.0001oC/s. Based on it, the optimal distance used in the design of the heating system is 5cm and 10cm, and CO2 gas sensor successfully detected CO2 gas on it. This result can be used as supporting data in designing a heating system for portable CO2 concentration gauge for soil.

Keywords
Temperature distribution; Temperature alteration; Peat soil

Topic
Physics

Link: https://ifory.id/abstract/FgXQrPJybKH4

Corresponding Author
Sparisoma Viridi

Institutions
Prodi Fisika, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
Penggunaan toilet tidak dengan benar sehingga keadaan toilet tidak kembali bersih seperti semula kadang amat menjengkelkan bagi pengguna yang terakhir. Terdapat berbagai penyebab hal ini dapat terjadi termasuk kebiasaan tidak bersih, berbeda kultur dan jenis toilet yang digunakan, serta ketidaktahuan. Dalam karya ini ingin diperkenalkan suatu sistem yang dapat dipasangkan pada toilet yang sudah ada sehingga tidak perlu merombak secara keseluruhan toilet. Dengan sistem Toilet Bersih dan Pintar (TBP) ini diharapkan pengguna dapat diarahkan untuk menggunakan toilet dengan baik sehingga keadaan akhir setelah digunakan sama bersihnya dengan keadaan awal sebelum digunakan. Terdapat beberapa komponen yang digunakan dan saling berinteraksi, seperti kunci otomatis (KOT), tombol pilihan menu (MEN), pembangkit suara (SUA), kamera (KAM), monitor (MON), dan pusat pemroses informasi (CPU). Terdapat berbagai skenario penggunaan toilet, yang salah satunya adalah dengan urutan MEN -> KOT -> USA -> KAM (pic-i) -> MEN -> SUA -> KAM (pic-f) -> CPU (pic-f - pic-i) -> SUA -> KOT, bila pengguna membersihkan toilet seperti keadaan semula (pic-f - pic-i == 0) dan KOT dibuka. Beberapa skenario lain diungkapkan dengan alternatif konsekuensinya. Dalam pemodelan sistem ini diasumsikan interaksi antara komponen bersifat nirkabel.

Keywords
model, toilet bersih, nirkabel, kontrol, instrumentasi

Topic
Physics

Link: https://ifory.id/abstract/JHcFLNmYVRte

Corresponding Author
Jienicha Santa

Institutions
a) Program Studi Fisika, Institut Teknologi Bandung
Jalan Ganesha 10, Bandung 40132, Indonesia
b) Rock Fluid Imaging Lab

Abstract
Seismik interferometri secara sederhana adalah studi mengenai interferensi antara sinyal seismik yang bertujuan untuk mendapatkan informasi dari perbedaan diantara pasangan sinyal tersebut. Seismik Interferometri pertama kali diperkenalkan oleh Claerbout pada 1968, Claerbout menunjukkan bahwa respon reflektansi dari lapisan horizontal dapat disintesis dari respon transmitansi. Berdasarkan sumbernya, metode seismik interferometri dapat dibedakan menjadi seismik interferometri sumber terkontrol dan seismik interferometri pasif. Seismik interferometri membuat salah satu receiver dapat dianggap sebagai sumber, meskipun tidak ada sumber fisik, sehingga receiver ini disebut juga sebagai sumber virtual (virtual source). Kelebihan metode seismik interferometri ini adalah dapat menggunakan sumber seismik alami dengan frekuensi rendah dibandingkan dengan metode konvensional yang mengharuskan penggunaan sumber seismik aktif yang lebih memakan biaya. Pada penulisan ini akan dibahas mengenai konsep dan prinsip - prinsip dasar interferometri serta aplikasi dan pemanfaatan dari seismik interferometri untuk mentransformasi data VSP (Vertical Seismic Profile) menjadi data Xwell (Cross Well). Data crosswell disintesis dengan melakukan korelasi silang antara respon set geophone pada dua buah sumur dengan sumber berada di permukaan dan respon masing � masing set geophone telah di normalisasi dan difilter terlebih dahulu. Hasil korelasi silang yang di dapatkan tidak persis sama dengan respon asli, yaitu respon pada geophone di salah satu sumur dimana sumber berada di sumur lainnya, namun dari perbandingan hasil korelasi silang dan respon asli dapat dilihat beberapa kemiripan sehingga dapat disimpulkan bahwa metode ini dapat digunakan sebagai metode lain untuk mensitesis data crosswell tanpa harus menggunakan sumber di sumur.

Keywords
Gelombang seismik, interferometri, korelasi silang, redatuming

Topic
Physics

Link: https://ifory.id/abstract/BHuhgeCm7UdT

Corresponding Author
Diah Mulhayatiah

Institutions
UIN Sunan Gunung Djati Bandung

Abstract
Development of learning media needs to be done to increase students interest in learning and stimulate teacher creativity in creating an interactive learning atmosphere. This study aims to develop teaching aids as an alternative to physics learning media in momentum material. The method used in this study is research and development with the stages of analysis, design, development, implementation and evaluation. The stage described in this study is the development stage in the laboratory test section. The laboratory test results for momentum props found that the relative error of the data obtained for the initial momentum was 0.1% and the final momentum ranged from 9%. The momentum props developed were able to present data and show momentum calculations through equations

Keywords
momentum, impuls, props

Topic
Physics

Link: https://ifory.id/abstract/7vQrUckR2y8C

Corresponding Author
yoga satrio utomo

Institutions
Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
Pemantauan Gempa Tektonik-Vulkanik dilakukan agar dapat memprediksi letusan dan untuk mengevaluasi seberapa bahaya letusan gunung berapi. Monitoring tersebut menggunakan seismometer dengan transmisi nirkabel menggunakan frekuensi radio. Tetapi transmisi frekuensi radio dengan frekuensi rendah tidak dapat menembus objek penghalang (pohon, batu, dan lain-lain) dan terdapat ketidakseimbangan ukuran data transmisi dengan kecepatan transmisi. Oleh karena itu, penulis mencoba menggunakan transmisi sinyal berbasis IoT. Untuk riset yang dilakukan, penulis membandingkan data pemantauan gempa tektonik-vulkanik hasil pengamatan langsung dengan data hasil transmisi berbasis IoT secara uji laboratorium menggunakan 2 akselerometer (ADXL 335) yang salah satunya terhubung langsung dengan komputer dan yang lain terhubung melalui internet dengan jarak ±2 km. Pada pengujian alat, digunakan palu godam sebagai sumber frekuensi. Palu godam dilapisi karet untuk memfilter frekuensi agar menghasilkan frekuensi rendah yang sesuai dengan frekuensi V-T earthquake sekitar >10 Hz. Hasil data yang diperoleh dari kedua sensor berupa sinyal keluaran yang akan ditampilkan melalui web.

Keywords
Akselerometer, Frekuensi, IoT, Transmisi, V-T Earthquake

Topic
Physics

Link: https://ifory.id/abstract/pE9TGqyVUBau

Corresponding Author
luqman Hakim

Institutions
(a)Departement of Physics, Faculty of Mathematic and Natural Science, Palangka Raya University, Palangka Raya, Indonesia *luqman_h[at]mipa.upr.ac.id
(b)Departement of Biology, Faculty of Mathematic and Natural Science, Palangka Raya University, Palangka Raya, Indonesia
(c)Departement of Chemistry, Faculty of Mathematic and Natural Science, Palangka Raya University, Palangka Raya, Indonesia

Abstract
This study aims to utilize the use of ultrasonic waves that function as anti-bacterial coliforms in the Kahayan river water. Water sampling is done using the Grab Sampling technique using the Kemmerer Sampler tool. Water used as a sample is in environmental conditions. The application of ultrasonic waves is done by using frequency variations of 20 kHz, 30 kHz, 40 kHz, 50 kHz, and 60 kHz at 5 minutes to get the optimum frequency. Coliform test was carried out by the MPN method, with the stages of the estimation test, affirmation test, and colony calculation. MPN test results show that the use of ultrasonic as the optimum anti-bacterial at a frequency of 40 kHz. Efficiency in this treatment is 89.9%.

Keywords
Ultrasonic wave, anti-bacterial, Grab Sampling, Coliform

Topic
Physics

Link: https://ifory.id/abstract/nbeVpTRzFEt3

Corresponding Author
Annisa Nadhira

Institutions
a) Department of Physics Education, Indonesia University of Education Jalan Setiabudi No. 229
Bandung 40154, West Java, Indonesia
*its.annisanadhira[at]gmail.com
b) Physics of Complex Systems, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10
Bandung 40132, West Java, Indonesia

Abstract
Knowledge about the physical parameters of rocks is important in order to understand the properties associated with the fact that porous rocks are fluid storage media. The amount of the contained fluid can be estimated roughly by analyzing the pore fraction of rocks. To investigate the pore evolution, a series of uniaxial compression test was conducted on an altered breccia rock sample. The sample was obtained from a potential geothermal area at Kadidia-Sigi, Sulawesi Tengah. The uniaxial compression treatment started from the natural pressure 438,468 N/m2 then, 629,079 N/m2, 1,887,238 N/m2, 3,145,396 N/m2, 4,403,554 N/m2, and 5,032,633 N/m2. Digital image processing and analysis method were applied to record and analyze the deformation of pore and fracture structure. Qualitative analysis was conducted by investigating the produced 2D and 3D images, and it was shown that the pore intensity and the fractures intensity increases as the pressure increase. Quantitative analysis was conducted by investigating the porosity and specific surface area as a function of the applied pressure. It was found that porosity {ϕ(P)} is in the function of a positively second-degree polynomial and specific surface area {SA(P)} is in the function of a negative second-degree polynomial.

Keywords
pore structure; uniaxial mechanical pressure; an altered breccia rock

Topic
Physics

Link: https://ifory.id/abstract/BxRYNvLh9j6b

Corresponding Author
Abd Haji Amahoru

Institutions
Institut Teknologi Bandung

Abstract
Fisika adalah suatu ilmu pengetahuan yang mempelajari tentang fenomena atau gejala alam, sehingga pengamatan adalah salah satu aspek yang sangat penting. Pengamatan dilakukan untuk mempelajari fenomena fisis dan jika diperlukan, pengamatan dapat dilakukan menggunakan perangkat yang sesuai. Perangkat tersebut tidak harus mahal karena bisa juga dirancang dengan menggunakan bahan-bahan yang ada di sekitar kita yang cukup mudah dijangkau sekaligus canggih. Dalam makalah ini dikembangkan suatu perangkat pengamatan dan pengukuran kinematika dengan menggunakan teknik Long Exposure. Long exposure merupakan teknik pengambilan gambar pada kamera yang mampu merekam seluruh jejak benda yang bergerak pada suatu waktu tertentu yang tidak bisa ditangkap dengan kasat mata. Untuk memastikan bahwa perangkat yang digunakan sesuai dengan prinsip kinematika dan bekerja dengan baik, terlebih dahulu dilakukan validasi yaitu dengan mengukur percepatan gravitasi bumi. Pada kegiatan validasi, sebuah lightmeter berupa lampu led dilepaskan dari ketinggian tertentu dan mengalami gerak jatuh bebas. Perangkat kamera yang telah dilengkapi fitur long exposure diletakan di depan sebuah piringan berlubang yang berfungsi sebagai chopper yaitu celah bagi kamera untuk menangkap lintasan dari lightmeter tersebut secara diskrit. Jumlah lubang yang digunakan bervariasi yaitu 3, 4, 6, dan 12. Dengan teknik pengolahan dan analisis citra digital sederhana, diperoleh nilai percepatan gravitasi yang mendekati nilai percepatan gravitasi referensi (9,8 m/s2). Untuk chopper dengan 3 lubang diperoleh nilai percepatan gravitasi bumi 9,66 m/s2 dengan nilai error 1,43, chopper 4 lubang percepatan gravitasinya 9,60 m/s2 dengan nilai error 2,04, coper 6 lubang percepatan gravitasinya 9,14 m/s2 dengan nilai error 6,73, dan coper 12 lubang percepatan gravitasinya 8,79 m/s2 dengan nilai error 10,30. Dengan demikian dapat dilihat bahwa perangkat yang dikembangkan dapat digunakan untuk mengukur kinematika dengan akurasi yang baik.

Keywords
kinematika, long exposure, percepatan gravitasi bumi

Topic
Physics

Link: https://ifory.id/abstract/8JnakqML2hEr

Corresponding Author
Nadia Azizah

Institutions
ITB

Abstract
Fisika adalah ilmu yang mempelajari tentang alam dan gejalanya. Salah satu bidang kajian dalam fisika adalah kinematika. Kinematika merupakan ilmu yang membahas tentang gerak suatu benda yang melibatkan analisis posisi, perpindahan, kecepatan, dan percepatan. Untuk menentukan besaran-besaran tersebut diperlukan alat ukur yang memadai. Pengukuran yang dilakukan dengan memanfaatkan panca indera seringkali memberikan hasil pengukuran dengan kesalahan yang cukup tinggi. Untuk memperkecil kesalahan yang disebabkan oleh manusia, pengukuran dapat dilakukan dengan menggunakan perangkat yang lebih akurat dibandingkan dengan panca indera. Dalam percobaan ini, teknik video tracking digunakan untuk mendapatkan data posisi sekaligus waktu. Video hasil pengamatan tersebut dianalisis menggunakan perangkat Tracker dimana objek yang berubah posisinya dalam bidang x-y dari satu frame ke frame berikutnya dapat dilacak posisinya. Aplikasi Tracker merupakan Open Source Physics (OSP) tool Java Workframe yang digunakan dalam pelacakan objek. Sebelum digunakan lebih lanjut untuk kasus-kasus kinematika, aplikasi ini perlu diuji keabsahannya. Dalam pengujian ini, sebuah tabung hampa udara dibuat dan benda yang jatuh bebas dalam tabung tersebut direkam. Rekaman tersebut dianalisis menggunakan Tracker untuk memperoleh data posisi terhadap waktu. Dengan melakukan polinomial fitting orde dua pada data posisi terhadap waktu, nilai percepatan gravitasi dapat diperoleh. Pengamatan dilakukan menggunakan perekaman video dengan kecepatan 1000 fps. Ada tiga objek yang dijatuhkan dalam tabung. Objek ke-1 menghasilkan nilai percepatan gravitasi 10,6 m/s2 dengan kesalahan 8,7%. Objek ke-2 menghasilkan nilai percepatan gravitasi 10,4 m/s2 dengan kesalahan 6,3%. Objek ke-3 menghasilkan nilai percepatan gravitasi 10,9 m/s2 dengan kesalahan 11,9%. Dari ketiga objek tersebut, nilai rata-rata percepatan gravitasi yang dihasilkan adalah 10,685 dengan kesalahan 9,034%. Dengan teknik video tracking, percepatan gravitasi dapat dihitung dengan rata-rata kesalahan < 10%. Data posisi terhadap waktu juga dapat diperoleh sehingga dapat digunakan untuk melakukan analisis kinematika lainnya.

Keywords
Kinematika, Tracker, Percepatan Gravitasi, Tabung Hampa Udara.

Topic
Physics

Link: https://ifory.id/abstract/BHeUxvq7jf6w