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Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156     DOI : -
Core Subject : Science,
Materials Science & Nanotechnology Physics
Jurnal ini diterbitkan oleh Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Lampung sebagai sarana untuk mempublikasikan hasil penelitian, artikel review dari peneliti-peneliti di bidang fisika teori dan aplikasinya. Jurnal ini terbit dua kali setahun (Januari dan Juli).
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Articles 332 Documents
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Delineasi Patahan di Pulau Weh sebagai Perpanjangan The Great Sumatran Fault (GSF) Berdasarkan Data Metode Geomagnetik Afrahun Naziah; Nazli Ismail; Nasrullah Zaini; Muhammad Nanda
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2819

Abstract

Abstract. This research has mapped the active fault of the Seulimeum segment part of the extension of The Great Sumatran Fault (GSF) in the northern as preparation for disaster mitigation. Nevertheless, seismic activity significantly on the Seulimeum segment still has not happened yet. This situation has the potential for a hugely destructive earthquake with a magnitude reaching ~7.4 and also will threaten the Weh island at the northernmost end of the Seulimeum segment even though the Weh island is a settlement, integrated economy area, tourism, trade area, and freeport zone. This study used geophysical methods, i.e., geomagnetic methods, for subsurface investigation. Each distance of 500m data was measured throughout the island using the Proton Precession Magnetometer (PPM) GEM 19 to get 204 total magnetic field data. The correction process (e.g., diurnal and IGRF) is done to get the total intensity of magnetic anomalies. Based on the calculation of residual data and analytical signals from the intensity of total magnetic anomalies, Interpretation found 13 fault distributions around the island with orientation in the northwest-southeast. This result has in agreement with the previous studies. However, this research has did not yet got information about geometry and fault depth. Comprehensive research is needed to complete it.Keywords: The Great Sumatran fault, Seulimuem segment, geomacnetic, Weh island.Abstrak. Salah satu upaya dalam persiapan mitigasi bencana adalah pemetaan patahan yang diduga aktif. Penelitian ini telah memetakan perpanjangan patahan aktif The Great Sumatran Fault (GSF) dari Segmen Seulimeum. Meskipun Segmen Seuliemuem merupakan bagian dari GSF yang sangat aktif dibagian selatan Sumatera, namun aktivitas seismik secara signifikan dibagian segmen seulimeum masih belum terjadi. Hal ini diperkirakan berpotensi menghasilkan gempa besar dengan magnitudo mencapai ~7.4. Keadaan ini juga mengancam Pulau Weh yang berada di ujung bagian utara dari Segmen Seulimeum. Padahal Pulau Weh merupakan kawasan pemukiman, ekonomi terpadu, pariwisata dan pelabuhan bebas. Penelitian ini menggunakan metode geofisika yaitu metode geomagnetic untuk investigasi bawah permukaan. Pendekatan metode geofisika dari metode magnetik dilakukan untuk melengkapi dan memperbaharui temuan pada penelitian-penelitian sebelumnya terkait distribusi patahan dan perpanjangan Segmen Seulimeum dari GSF. Pengambilan data dilakukan sebanyak 204 titik dengan jarak antar titik ± 500 meter di seluruh Pulau Weh menggunakan Proton Precession Magnetometer (PPM) GEM 19. Data hasil pengukuran kemudian dilakukan koreksi International Geomagnetic Reference Field (IGRF) dan diurnal untuk mendapatkan nilai anomali intensitas magnetik total di Pulau Weh. Hasil interpretasi berdasarkan pengukuran efek regional dan perhitungan signal analytik didapatkan sebaran patahan sebanyak 13 patahan dengan orientasi timur laut-tenggara Pulau Weh. Temuan distribusi patahan ini mengikuti pola kesesuaian dengan kajian sebelumnya yang hanya memanfaatkan data permukaan saja. Meskipun demikian, penelitian ini belum mendapatkan informasi terkait geometri dan kedalaman patahan. Kajian lanjutan diperlukan untuk melengkapi informasi tersebut. Kata kunci: Patahan Sumatera, Segmen Seulimuem, geomagnetik, Pulau Weh.
Design of an Earthquake Intensity Estimation System for Early Warning Trismahargyono Trismahargyono; Sri Ratna Sulistiyanti; Roniyus Marjunus
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2803

Abstract

Indonesia is located at the junction of three tectonic plates and has many active faults. The consequence of this tectonic arrangement makes Indonesia prone to earthquakes. Therefore, earthquake mitigation efforts based on an early warning system need to be done. The design of an earthquake strength estimation system, based on python, for this early warning, analyzes the initial phase of the first three seconds since the arrival of the P wave, using parameters in the form of Pd (the maximum amplitude of the first three seconds of the arrival of the P wave). The resulting tools and systems consist of hardware in the form of Raspberry Pi3B + and ADXL345. The system will detect in real time and automatically trigger an earthquake using the STA / LTA method. When the Pd and Td parameters have been obtained, the system will calculate and issue earthquake strength information, in the form of magnitude and intensity scale of earthquake damage MMI (Modified Mercally Intensity), which will then be sent automatically via the telegram application. Testing of tools and systems was carried out in an earthquake simulator, using the Padang earthquake parameters on 30 September 2009, 17:16:09 WIB. The results of the test produce an intensity scale of VIII MMI, these results are close to the results of the BMKG for the earthquake, with an intensity scale of VIII MMI.  From these results the designed tools and systems can be used to provide early warning in the event of an earthquake.
Rancang Bangun Sistem Hidung Elektronik Berbasis Sensor Gas MQ untuk Mengevaluasi Kualitas Madu Minarni Shiddiq; Annisa Fadlillah; Sinta Afria Ningsih; Ikhsan Raahaman Husein
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2722

Abstract

Honeys come in many varieties based on quality attributes and region origin. Electronic nose systems have been adopted and used to classify honey types based on physicochemical parameters. This study was aimed to build a low cost  electronic nose (e-nose) based on metal oxide semiconductor (MOS) gas sensors, and then used to evaluate the qualities of two types of honeys and one non honey based on sugar contents and pH values. Six gas sensors of MQ modules namely MQ2, MQ3, MQ4, MQ5, MQ6, MQ9, and an Arduino microcontroller were used in this system.  Software of Arduino IDE, PLX-DAQ, and Python were applied to record output voltages of each sensor, saved in Excel format, and to calculate trapezoid areas respectively. Honey samples were named as A, B, and C which were. a national brand honey, a local forest honey, and date syrup respectively. The results show higher output voltages for MQ 3, MQ 4, and MQ 6 sensors. The six sensors are able to differentiate between the two honey types and non honey. Sample A has the highest trapezoid area while sample C has the lowest area. This could be caused by higher pH value of sample C.
Desain Pengendali A Modified Fractional Order PID (PI^λ D^μ) untuk Pengendalian Level Pressurizer pada Pressurized Water Reactor (PWR) Rissa Damayanti; Abdul Halim
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2821

Abstract

Desain Pengendali A Modified Fractional Order PID () untuk Pengendalian Level Pressurizer pada Pressurized Water Reactor (PWR). Sistem pengendalian level air pada pressurizer ini dilakukan untuk menjaga keselamatan saat reaktor PWR sedang beroperasi. Pengendalian ini dilakukan dengan mempertahankan level air di pressurizer pada setpoint ketinggian tertentu. Ketinggian level  air akan  berubah sesuai dengan kondisi dari  reaktor  nuklir  seperti  bila terjadi proses  pengisian, pemanasan,  pendinginan,  perubahan  konsentrasi  boric  acid dalam  kalang  primer, serta  kemungkinan adanya kebocoran di pompa sirkulasi utama atau jalur pipa primer. Berbagai metode pengendalian telah banyak dikembangkan dengan tujuan untuk mendapatkan sistem pengendalian dengan tingkat respond sistem dan keselamatan paling baik. Penelitian  ini  bertujuan untuk  menjawab  permasalah yang ada dengan menggunakan sistem pengendalian Fractional Order PID serta membuktikan bahwa dengan menggunakan sistem pengendali tersebut akan memberikan hasil yang lebih  baik  dari  aplikasi  sistem  yang sudah ada. Pada penelitian ini diperoleh konfigurasi gain pengendali FOPID yang paling sesuai dengan persyaratan desain dengan nilai Kp sebesar 223.764, Ki sebesar 132.404, Kd sebesar 93.98 dan λ sebesar 0.0119,  sebesar 1.0080, yang menghasilkan waktu penetapan (settling time) lebih cepat 285 kali dan lewatan maksimum (maximum overshoot) lebih rendah 48.6 kali bila dibandingkan dengan pengendali  digabung dengan  pada penelitian sebelumnya.
Sintesis Magnesium Oksida (MgO) dari Dolomit Bangkalan dengan Metode Leaching Devi Saputri; Lydia Rohmawati
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2808

Abstract

Magnesium oxide (MgO) is a ceramic material that has potential in the medical and industrial fields, where MgO can be obtained from natural dolomite which has a composition of 21.9% MgO and 54.3% CaCO3. However, MgO from dolomite has not been studied much so that this study was conducted with the aim of analyzing the effect of the holding time of calcination on the synthesized MgO phase. The MgO synthesis method uses the Leaching method, which is dissolving dolomite with HCl and stirring it at 75 ° C for 45 minutes. After that, it is filtered where the results of the filtrate are added with ammonia until the solution reaches pH 12 and a precipitate is formed. Furthermore, the precipitate was filtered and dried at 90 ° C for 6 hours, and calcined at a temperature of 800 ° C with a variation of the holding time of 4, 8, 12, 16, and 20 hours. The calcined powder was characterized by XRD and FTIR. The results showed that the optimum MgO periclase main phase was formed at a holding time of 8 hours at a calcination temperature of 800 ° C and had a nanocrystalline size of 20.12 nm. FTIR results show that the MgO synthesized with a holding time of 8 hours has functional groups Mg-O, Mg-O-Mg, C = O, alkene groups, and H-O-H in the wave number range of 4000 cm-1 - 500 cm-1.
Penentuan Titik Pengamatan Optimal Terhadap Kualitas Udara pada Gas Keluaran Diffuser berbasis Internet of Things Irmayatul Hikmah; Afifah Dwi Ramadhani; Fikra Titan Syifa
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2754

Abstract

Indoor air quality needs attention, especially during the COVID-19 pandemic because the majority of activities are carried out indoors. The air in the room must be protected from the threat of harmful virus and bacterial contaminants. One such innovation is placing diffuser in the room. Diffuser is a device that converts liquid into gas particles in the air. To reduce harmful virus contamination, a natural antiseptic liquid is filled into the diffuser, one of which is papermint essential oil, which can provide freshness in the room. Air quality is monitored with internet of things (IoT) technology so that users can easily control air quality with just a PC/gadget. The gas output from the diffuser is detected by a gas sensor that is connected to the wemos board so that the data can be connected to the internet cloud. To obtain optimal air quality data, the placement of gas sensors in the area around the diffuser as a point of observation needs to be considered because the distribution of gas in the air is influenced by the vertical wind speed in the room, this can affect the quality of the data generated. This study aims to determine the optimal observation point on an IoT-based diffuser so that the resulting air quality data is more accurate. In this study the gas sensor was placed at a distance of 15 and 25 cm from the diffuser. The direction of the gas sensor placement was adjusted according to the angle of the full circle ranging from 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 0°. The distribution of gas is influenced by the vertical wind speed in the room causing the air quality data at a vertical angle to always have the same pattern. From the results obtained, the optimal observation point as a reference for the position of the gas sensor to the diffuser is at an angle between 135°-180° as well as at an angle between 315° -0°.
Pengujian Gugus Fungsi Silika Berbasis Sekam Padi Dengan Variasi Suhu & Konsentrasi Cetyltrimethylammonium Bromide Sebagai Bahan Baku Mesoporous Silica Leni Rumiyanti; Catur Destiana; Ria Oktaviani; Simon Sembiring; Syafriadi Syafriadi; Ni Luh Gede Ratna Juliasih
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2727

Abstract

Research has been conducted to test silica function groups based on rice husks with temperature variations and concentrations of Cetyltrimethylammonium Bromide as raw materials for mesoporous silica. In this study, rice husk silica was synthesized by alkaline method with variations in CTAB concentrations of 2.0%, 2.5%, 3.0%, 3.5%, and hydrothermal treatments with temperature variations of 120, 130, 145, and 160ºC for 1 hour in an autoclave. Fourier-Transform Infrared (FTIR) results showed the presence of the most dominant clusters, namely Si-O-Si and other groups such as C-H, -H, O-H, and –OH. Therefore, silica-based rice husks can be used as raw materials mesoporous silica
Sintesis Soluble Polianilin dengan Variasi Jenis dan Konsentrasi Dopan Retno Fitri Wulandari; Nugrahani primary putri
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2809

Abstract

This study reports the synthesis of soluble polyaniline by the oxidation polymerization method with various dopants HCl, H2SO4, and Fumaric acid (FA). This dopant variation is carried out to obtain polyaniline with optimum solubility and electrical conductivity. The results of FTIR characterization showed several characteristic polyaniline bonds from the samples that had been synthesized. PANi/FA with a concentration of 1M has the best solubility compared to PANi/HCl and PANi/H2SO4, with a solubility value of 5.7% in NMP solvents. The electrical conductivity of all samples was measured by the two-point probe method. PANi / HCl with a concentration of 1M has the best conductivity than PANi/FA and PANi/H2SO4 with a value of 48 x10-4 S/cm. The morphology of the oxidized polyaniline powder was observed using SEM. SEM results showed the morphology of polyaniline in the form of an interconnected sponge.
Aplikasi Sensor TGS2620 dan MQ138 untuk Mendeteksi Kematangan Buah Durian Berbasis Raspberry Pi 3B Dewi Puspitasari; Arif Surtono; Sri Wahyu Suciyati; Gurum Ahmad Pauzi
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2760

Abstract

Telah dilakukan penelitian dengan pengaplikasian sensor gas TGS 2620 dan MQ 138 untuk mendeteksi kematangan buah durian berbasis Raspberry Pi 3b. Penelitian ini dilakukan untuk menghasilkan alat deteksi tingkat kematangan buah durian. Durian diletakkan ke dalam ruang sampel yang berisi sensor gas. Metode klasifikasi yang digunakan untuk menentukan kematangan buah menggunakan K-Nearest Neighbor (KNN). Pengujian KNN dalam klasifikasi kematangan durian menggunakan sensor gas memiliki akurasi keseluruhan 91,07%.
Pengaruh Medan Listrik sebagai Stimulan Pertumbuhan Bawang Putih Lokal Timor gede arya wiguna; welsiliana welsiliana; florian mayesti prima remba makin; ite morina yostianti tnunay
Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i2.2815

Abstract

The decline in Timorese local garlic yields will have an impact on farmers' income and the existence of the garlic. One of the decline factors is production. The purpose of this study is the implementation of an electric field as a stimulant for garlic growth. The electric field used is an AC electric field with an output frequency of 1.0 kHz. The variation of the electric field used is 1.28 kV/m, 1.55 kV/m. 1.80 kV/m, 2.12 kV/m and 2.48 kV/m. The results showed that exposure to an electric field in garlic resulted in a better germination rate, average germination time, and shoot and root growth rate compared to the control. The treatment of exposure to an electric field of 1.55 kV/m resulted the most optimum in the germination rate, average germination time and growth rate of shoots and roots with the respective values (11.4 ± 0.6) %/etmal, (1.4 ± 0, 1) day, (2.83 ± 0.09) mm/day, and (2.04 ± 0.09) mm/day. Increasing germination, shortening the average germination time and growth rate are expected to increase local Timor garlic production.

Page 27 of 34 | Total Record : 332

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