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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).
Arjuna Subject : -
Articles 332 Documents
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Identifikasi Sebaran Asap Kebakaran Hutan di Wilayah Jambi dengan Menggunakan Radar C-BAND Ekky Amiral Faqi; Kholis Nur Cahyo; Imma Redha Nugraheni
Jurnal Teori dan Aplikasi Fisika Vol 11, No 2 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i2.3087

Abstract

Forest and land fires along with the distribution of smoke are one of the disasters threats in the Jambi region which has tropical forests. By knowing the lowest level of visibility from observations, this study was conducted on September 23, 2015. Weather and satellite radar have ability to detect particles and the distribution of smoke from forest and land fires with great spatial and temporal resolution, supported by HIMAWARI-8 satellite data as comparison. C-Band Doppler radar and default strategy scanning are used to identify smoke in Jambi. Wind layer analysis uses CAPPI V products to display smoke distribution and CMAX dBZ with palette changes to identify smoke particles, which then will be carried out vertical cross section to see smoke reflectivity values, identify smoke vertical profiles, and patterns of smoke distribution of forest and land fires. The smoke reflectivity index value can be seen from the dBZ value. The results of the identification show that the smoke material reaches a maximum reflectivity value of 30 dBZ at the centre of the fire point and the minimum value of very fine smoke particles reaches -24.4 dBZ which scattered with the dominant velocity distribution direction to the northwest.
Dynamic Viscosity Measurement Method Based on the Stokes Drag of Prolate Ellipsoidal Mass Arifrahman Yustika Putra; Efta Yudiarsah; Arief Sudarmaji
Jurnal Teori dan Aplikasi Fisika Vol 12, No 1 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i1.14205

Abstract

Viscometer plays an important role in the field of tribology. One way to measure viscosity is to use the Stokes drag principle in the underdamped harmonic oscillation phenomenon. This paper proposes a dynamic viscosity measurement method based on the related physical laws. Our experimental model involves a prolate ellipsoidal mass that experiences underdamped harmonic oscillation within viscous liquid samples. We observed the oscillations of the prolate ellipsoid to obtain the viscous damping coefficient of each sample and substituted it to the theoretical formula of dynamic viscosity. Experimental data suggest that the mathematical model has failed to predict the viscosity values of the samples. In addition, the regression curve of the reference viscosity and the measured viscous damping coefficient shows that the two quantities have an exponential relation instead of linear relation as explained in the theoretical model. We considered the regression formula as the empirical measurement transfer function and used it to measure the viscosity of an ISO VG 150 industrial oil sample. This measurement resulted in a 2.40 % of relative error percentage. Lastly, this measurement method is only valid for measuring samples with viscosities ranging from 0.0400 Pa s to 0.256 Pa s.
U-bend Optical Fiber to Determine Characteristics of pH Sensor Muhammad Yunus
Jurnal Teori dan Aplikasi Fisika Vol 11, No 1 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v10i2.3016

Abstract

Determination of the characteristics of the pH sensor using U-shaped optical fiber was carried out with various varieties, namely length without a coat, indentation diameter, and the number of imperfections. Optical fiber as a light transmission medium is used as a sensor to detect the pH level of the solution. The sensor output is read on the OPM in the form of output power. The best characteristic of the pH sensor was obtained in the number of imperfections, namely number of imperfections 3 with a value range of 32.0 µW, a sensitivity of 3.2 µW/pH, and a resolution of 0.3 x 10-3 pH. The greater the power losses in the optical fiber sensor, the better the sensor characteristics. Determination of the characteristics of the pH sensor is very suitable to be carried out using U-shaped optical fiber in simple measurements and easy fabrication.
Peningkatan Fungsi Daun Chaya sebagai Agen Reduksi pada Sintesis Seng Nanopartikel sri wahyu suciayti; Posman Manurung; Suprihatin Suprihatin; Fegi Liani
Jurnal Teori dan Aplikasi Fisika Vol 12, No 1 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i1.14202

Abstract

Nano-ZnO biosynthesis has been carried out using Chaya leaves with the addition of 0.7M NaOH. The aim is to determine the results of nano-ZnO synthesis regarding the formation of functional groups, phase structure, morphology, band gap energy, and its potential as an antibacterial. The synthesis process was carried out in three stages, namely, extraction of Japanese papaya leaves, synthesis of nano-ZnO, and characterization using Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and UV-Diffuse Reflectance (UV-DRS). Nano-ZnO samples were applied in antibacterial tests. The results of FTIR analysis show the formation of ZnO functional groups at wave numbers 599-509 cm-1 with the main functional groups involved being O-H, C=O, N-H, and C-N. The results of the XRD analysis showed that the phases formed in the sample were zinc oxide, zinc phosphate, zinc iron oxide and zinc chlorate hydrate. Factors that influence the formation of other phases are because Japanese papaya leaves contain phosphorus and iron, the ZnO phase formed has a wurtzite structure. The results of UV-DRS analysis show that the band gap energy is close to the standard of 3.24 eV with an absorbance value of 362 nm. TEM results show that the particle morphology experiences agglomeration due to the presence of other compounds. The antibacterial activity of Nano-ZnO with a NaOH concentration of 0.7 M resulted in an average zone of inhibition of bacterial growth in E.coli of 0.21 mm.
KARAKTERISTIK KOMPOSIT ASPAL KARBOSIL DARI LIMBAH SEKAM PADI liyana mardova; Simon Sembiring; Junaidi Junaidi
Jurnal Teori dan Aplikasi Fisika Vol 11, No 1 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i1.2854

Abstract

In this study, the characterization of the carbosil asphalt composite was carried out with a composition variation of 1:9; 1.5:8.5; 2:8; 2.5:7.5; 3:7 and the ratio for pure carbosil without the addition of asphalt. Carbosil is obtained from rice husk waste by using the pyrolysis method. This research was conducted to determine the effect of temperature on the microstructure, structure and functional groups of carbosil asphalt composites. XRD analysis obtained that the phase formed from each composition variation was an amorphous phase. The DTA/TGA analysis shows that there is a change in energy due to the addition of heat, which is indicated by the presence of mass shrinkage in the sample. Compressive strength results indicate that the strength of the carbosil asphalt composite with different material compositions affects the resistance to cracking.
Studi Difusi Gadolinium Makrosiklik Pada Sel Kupffer Menggunakan Simulasi Monte Carlo Cell Stcay Gillian Alehandra Gore; Adita Sutresno; Andreas Setiawan
Jurnal Teori dan Aplikasi Fisika Vol 11, No 2 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i2.12462

Abstract

Contrast agents containing gadolinium (Gd) are classified into two types based on their molecular structure: linear and macrocyclic. The macrocyclic type is known for its enhanced stability, resulting in minimal release of Gd ions within the body. The distribution of macrocyclic Gd within the kupffer cells in the liver, undergoes a diffusion process. In this study aimed to investigate the diffusion mechanism of macrocyclic gadolinium in kupffer cells. It employs a simulation geometry model employing Monte Carlo Cell and a three-compartment experimental model. The kupffer cell model in the simulation was generated using Blender 2.93 application, consisting of three compartments, while the experimental model involved three compartments containing a NaCl solution. The simulation results revealed that kupffer cell membran densities of 1480 molekul/μm2, 2961 molekul/μm2, 4442 molekul/μm2, and 5922 molekul/μm2 exhibited respective half-lifes of 0.547 s, 0.261 s, 0.198 s, and 0.148 s. Furthermore, the experimental results indicated that the models with 100, 200, 300, and 400 holes displayed half-lives of 1720 s, 578 s, 530 s, and 240 s, respectively. Result this research shows that higher membrane density and more significant number of holes results in faster molecule diffusion.
Optimasi Dosis Mata dan Kualitas Citra Menggunakan Shielding pada Pencitraan CT-Scan Kepala Irmayatul Hikmah; Aditya Prayugo Hariyanto; Nur Afifah Zen; Sevia Indah Purnama
Jurnal Teori dan Aplikasi Fisika Vol 11, No 1 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i1.3179

Abstract

Pemeriksaan radiologi yang umum digunakan di rumah sakit untuk mendeteksi adanya tumor adalah dengan menggunakan CT Scan (Computed Tomography Scanner). CT Scan digunakan untuk menentukan lokasi tumor dengan akurat dan mengetahui penyebaran tumor ke jaringan di sekitarnya. Pada kasus pendeteksian tumor di daerah kepala yang memberikan dosis radiasi tinggi, memungkinkan organ mata terdampak paparan radiasi yang dapat merusak jaringan sehat. Untuk itu diperlukan shielding atau perisai guna melindungi organ mata agar menerima paparan radiasi seminimal mungkin. Shielding yang digunakan didesain dari bahan khusus yang bersifat mereduksi paparan radiasi yang diterima kepada objek dibelakangnya yaitu mata. Penelitian ini bertujuan untuk mengoptimasi dosis radiasi sinar x secara maksimal pada pemeriksaan tumor di daerah kepala dengan meminimalkan dosis radiasi yang diterima organ mata serta mempertahankan kualitas citra tomography hasil pemeriksaan CT Scan. Tahapan metode yang dilakukan meliputi fabrikasi shielding mata, pengukuran dosimetri dan nilai Hounsfield Unit (HU), perhitungan Signal Noise to Rasio (SNR), dan analisis uji statistik. Dari hasil pengukuran dosimetri menunjukkan tanpa shielding dosis yang diterima mata phantom 52,81 mGy sedangkan penambahan shielding membuat dosis mengalami penurunan sampai 41,26 mGy. Nilai Hounsfield Unit (HU) tertinggi sebesar 2806,44 didapat pada shielding dengan penambahan Pb 5% yang menunjukkan daya absorbsi yang baik terhadap radiasi pengion. Perhitungan nilai SNR dengan shielding dan tanpa shielding memberikan hasil yang baik dimana kualitas citra tidak mengalami penurunan signifikan. Analisa uji statistik non parametrik diperoleh nilai p > 0.05 menunjukkan shileding dapat mereduksi dosis mata dengan tetap mempertahankan kualitas citra.
Mesin Carnot Quantum dengan Dua Partikel Tidak Berinteraksi dan Tidak Berdekatan Khazali Fahmi
Jurnal Teori dan Aplikasi Fisika Vol 11, No 2 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i2.11060

Abstract

In this article, we study the quantum Carnot engine using a one-dimensional infinite well potential model in which two particles are non-interacting, indistinguishable and have the same mass. We find that the efficiency of this model is the same as that of the one-dimensional infinite potential well model in which there is one particle. Moreover, efficiency can be measured only when L_C/L_A≥2, where L_A and L_C are the potential well widths during isothermal and adiabatic expansion, respectively.
Subsurface Utility Identification at ITERA Campus Using Multi-frequency Ground Penetrating Radar Andri Yadi Paembonan; Fedy Darma Wijaya Waruwu
Jurnal Teori dan Aplikasi Fisika Vol 12, No 1 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i1.14174

Abstract

Infrastructure development at the Sumatra Institute of Technology is growing rapidly, hence, it requires new utilities installation network such as cables and pipes to supply electricity and clean water. Installing new utility line, it is necessary to secure and know the existence and depth of the previously embedded utility network to avoid damage that could hamper the construction process or cause large losses. Accessing the sub-surface information, geophysical method, such as Ground Penetrating Radar (GPR) can be utilized for identifying buried utility networks, ensuring the safe installation of new utilities and preventing damage to existing embedded utilities. In this study, a GPR device with a frequency range 40 MHz-3.4 GHz comprising 5 tracks was employed. The acquired data underwent processing using GPR Insights software, generating a radargram cross-section that provides information about the subsurface.The results from the radargram reveal a hyperbolic reflection anomaly, signifying the presence of a utility network beneath the surface, suspected to be pipe and cable utilities. The utility network is detected at varying depths of 0.5 m, 0.8 m, 1 m, and 1.2 m at different distances. Furthermore, several anomalies in the form of hyperbolas are observed, suggesting potential utilities due to their continuity with other paths.
Analisis Klasifikasi Tipe Iklim Dari Data Curah Hujan Menggunakan Metode Schmidt-Ferguson (Studi Kasus: Kabupaten Tangerang) Ratu Ruqoyah; Yayat Ruhiat; Asep Saefullah
Jurnal Teori dan Aplikasi Fisika Vol 11, No 1 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i1.3076

Abstract

Curah hujan di Indonesia memiliki tingkat keragaman, hal tersebut memberikan pengaruh yang besar terhadap kehidupan masyarakat di Indonesia. Sehingga ketersediaan data curah hujan menjadi hal penting untuk memahami karakteristik dan klasifikasi tipe iklim. Penelitian ini bertujuan untuk mengetahui pola curah hujan dan mengetahui tipe iklim berdasarkan metode Shmidt-Ferguson. Penelitian ini menggunakan data sekunder berupa data curah hujan, kelembaban, tekanan, suhu, arah dan kecepatan angin pada periode 2011-2020, data yang diolah menggunakan perangkat lunak Microsoft Excel, Minitab, WRPlot dan Arcgis. Hasil Berdasarkan yang diperoleh bahwa pola curah hujan di Kabupaten Tangerang termasuk tipe munson karena mengalami puncak musim hujan pada bulan Desember-Februari dan musim kemarau pada bulan Juni-Agustus. Adapun hasil musim hujan maksimum yang terjadi pada bulan Februari tahun 2020 di Lokasi wilayah curug sebesar 556 mm/bulan dan pada tahun 2017 di wilayah balaraja sebesar 660 mm/bulan. Sedangkan untuk musim hujan minimum terjadi pada bulan Agustus tahun 2012 dan 2015 di wilayah curug dan balaraja sebesar 0 mm/bulan. Daerah Kabupaten Tangerang memiliki curah hujan klasifikasi menengah dengan intensitas rata-rata sebesar 101-300 mm/bulan. tipe iklim di Kabupaten Tangerang yaitu B dengan Kriteria Basah vegetasi Hutan Hujan Tropika yang memiliki curah hujan tinggi sehingga daerah selalu lembab yang berarti daerah ini dapat ditanami oleh berbagai jenis tumbuhan dan sangat cocok untuk sektor pertanian

Page 32 of 34 | Total Record : 332

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