cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Leni Rumiyanti
Contact Email
lenirumiyanti@fmipa.unila.ac.id
Phone
-
Journal Mail Official
lenirumiyanti@fmipa.unila.ac.id
Editorial Address
-
Location
Kota bandar lampung,
Lampung
INDONESIA
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 15 Documents
 1   2 
Search results for , issue "Vol 11, No 1 (2023): Jurnal Teori dan Aplikasi Fisika" : 15 Documents clear
Rancang Bangun Akuarium Portable Menggunakan Teknologi Internet Of Things Untuk Budidaya Ikan Hias Muhammad Basri; Joi Alfreddi Surbakti
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.v10i2.3146

Abstract

Portable aquarium designed with an automation system for controlling pH levels and temperature information. pH levels are measured using a pH sensor E-201-C and temperature is measured with a DS18B20 sensor. The pH control process is carried out by adding liquid pH up and pH down and is realized with a solenoid valve. The purpose of making this portable aquarium is to control the pH value of the water in the aquarium and provide information about the water temperature. Into this portable aquarium system have been inputted standard values of pH and temperature for each type of fish. This system will work automatically to adjust the living environment of ornamental fish according to their respective needs. The pH control system can work if the pH measurement value indicates a high pH or low pH condition and under these conditions, the water will flow into the pH adjustment tube to control. If the pH measurement value states that the pH is high then the pH down control liquid will flow and if the pH measurement value states that the pH is low then the pH up control liquid will flow. This system has been proven to be able to maintain the environmental conditions of ornamental fish with the results of pH and temperature measurements being 7.48 -7.8 and 28.87 – 29.55 °C.
Penentuan Density Matrix Sistem Kuantum Satu Partikel Dimensi Satu dengan Metode Discretized Path Integral (DPI) Iyan Islamiyati; I Wayan Sudiarta; Lily Maysari Angraini
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.v11i1.2886

Abstract

A mixed quantum system can be represented by a density matrix. By knowing the density matrix of the system, other thermodynamic properties of the system such as Helmholtz free energy and entropy can be determined. Computation of the density matrix of a one-dimensional single-particle quantum system using the discretized path integral(DPI) method is presented. The results of the DPI method were validated using the finite difference time domain (FDTD) method for a particle in an infinite square well and harmonic oscillator potentials. The results of density matrix, Helmholtz’s free energy and entropy have shown that the DPI method produces correct numerical values compared to the FDTD results. Then, the DPI method is used in the double-well potential by giving variations in barrier potential and temperature of the system. The results show that the particle will be tunneling when the barrier potential energy is more than the kinetic energy of the particle. The particle also can tunnel easily if the system has the higher temperature.
Perbandingan Aktifitas Fotokatalis Nanotitania Tanpa Dan Dengan Penambahan Etanolamina Di Bawah Sinar Matahari Dita Rahmayanti; Posman Manurung; Roniyus Marjunus
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.v11i1.2767

Abstract

Abstrak. Degradasi zat warna remazol kuning keemasan dilakukan dengan nanotitania. Sintesis nanotitania dipreparasi menggunakan metode sol gel dengan penambahan etanolamina sebagai surfaktan. Penelitian ini dilakukan bertujuan untuk mengetahui pengaruh penambahan etanolamina terhadap aktivitas fotokatalis dan energi celah pita nanotitania. Dalam penelitian ini penggunaan titanium butoksida, etanol dan HCl. Penambahan etanolamina yang divariasikan adalah 0 dan 1 ml. Sampel dikalsinasi pada suhu 500ºC selama 4 jam. Nanotitania dikaraterisasi menggunakan Spektrofotometri UV-Vis dan UV-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS) menggunakan metode Kubelka-Munk dalam menentukan energi celah pita. Uji aktivitas fotokatalis dengan mendegradasi larutan remazol kuning keemasan menggunakan sinar matahari sebagai pembantu terjadinya reaksi. Hasil karaterisasi UV-Vis DRS energi celah pita yaitu 3,18 dan 3,03 eV pada masing-masing sampel tanpa penambahan dan dengan penambahan etanolamina berturut-turut. Kata kunci: energi celah pita, etanolamina, fotokatalis, nanotitania, remazol kuning keemasan.
Review Mekanisme Pembentukan Massa Neutrino melalui Seesaw Tipe I Qidir Maulana Binu Soesanto; Akmal Ferdiyan
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.v11i1.3153

Abstract

Terdapat beberapa ekstensi Model Standar dalam Fisika Partikel untuk menjelaskan pembentukan massa neutrino. Salah satu ekstensi yang paling sederhana adalah mekanisme Seesaw tipe I. Dalam mekanisme ini diperkenalkan neutrino right-handed yang tidak ambil bagian dalam interaksi lemah atau sering disebut juga dengan steril (Y=0). Pada tulisan ini, kami berusaha menuliskan penjabaran mengenai mekanisme ini.
Nanofiber PVA/ZnO Sebagai Material Antimikroba Pada Wound Dressings putri uzalia; diah hari kusumawati
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.v11i1.3006

Abstract

Nanofibers are ideal for forming multifunctional medical products, one of which is wound dressings. Nanofibers wound dressings made from polyvynyl alcohol (PVA) and zinc oxide (ZnO) using the electrospinning method with varying voltages of 15 kv, 16 kv, 18 kv, and 20 kv, to determine the effect of stress on morphology, absorption and antibacterial activity. The resulting nanofibers have a smooth surface and an almost uniform fiber diameter. SEM analysis showed that the diameter of PVA 10% with a magnification of 50000X was 252 nm and PVA/ZnO 20 kv with a magnification of 30000X was obtained 231 nm, the EDX spectrum contained elements of C, O, and Zn respectively 37.40%, 62.14%, and 0.46%. The results of the FTIR analysis showed that the functional groups seen in the PVA/ZnO samples were O-H, CH2, C-H, C-O, and Zn-O. UV-Vis transmission showed that PVA had a high UV transmission of 12% but all PVA/ZnO nanofibers showed a UV transmission of almost 0%. Antimicrobial activity showed that the number of bacterial colonies in PVA/ZnO samples was less than the control. The average nanofibers diameter increases when ZnO nanoparticles are added, but when tension is increased, the average diameter of the nanofibers decreases. The morphology of the nanofibers is very uniform and there are no ZnO nanoparticle crystals, so PVA/ZnO nanofibers can be chosen as an ideal biomaterial for wound dressings.
SINTESIS DAN KARAKTERISASI WOLLASTONITE BERBASIS PREKUSOR BIOGENIK SILIKA ABU SEKAM PADI Amilia Rasitiani; Dwi Asmi; Muhammad Badaruddin
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.v11i1.2845

Abstract

The aim of this research is to make wollastonite from silica obtained from rice husk ash and commercial calcium carbonate using the solids reaction method. The DTA-TGA results show mass due to the evaporation of H2O and the decomposition of CaCO3 into CaO along with the calcination temperature, in addition, the DTA results also identify the formation of the β-CaSiO3 phase and the α-CaSiO3 phase. The XRD results of wollastonite obtained were dominated by the β-CaSiO3 phase and the minor phase was α-CaSiO3 this was indicated by the peak intensity of the β-CaSiO3 phase which was higher than the peak intensity of the α-CaSiO3 phase. the second phase in wollastonite is also the result of FTIR results through the analysis of the Si-O-Ca functional group in each wollastonite sample. In addition, the results of the SEM analysis showed the shape of the spheroidal particles (spherical) with an average grain size of 0.19 m, 0.35 m and 0.68 m for the calcination temperatures of 900 oC, 1000 oC and 1100 oC, respectively. The results of this study indicate that the manufacture of wollastonite from the basic ingredients of rice husk silica and commercial calcium carbonate has potential as an alternative material for the manufacture of wollastonite.
Penerapan Jaringan Saraf Tiruan / JST (Backpropagation) untuk Prakiraan Cuaca di Bandar Udara Radin Inten II Lampung Adi Saputra; Sri Ratna Sulistiyanti; Roniyus Marjunus; Yanti Yulianti; Junaidi Junaidi; Arif Surtono
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.v11i1.3164

Abstract

Prediksi cuaca diperlukan dalam perencanaan kehidupan sehari-hari, salah satunya untuk membuat keputusan. Keberhasilan dari suatu prediksi cuaca akan berdampak pada pengambilan keputusan di berbagai bidang, antara lain pada bidang pertanian dan penerbangan. Pada bidang penerbangan, prediksi cuaca penting untuk menentukan waktu, lokasi, arah gerak, ketinggian serta merencanakan pergerakan pesawat untuk memperhitungkan gangguan operasi yang dapat disebabkan jika cuaca sedang buruk dan juga untuk mempertimbangkan dalam menentukan rute penerbangan atau menentukan dalam membawa tambahan bahan bakar jika dalam suatu kasus pesawat harus kembali dikarenakan kondisi cuaca yang tidak memungkinkan. Oleh karena itu perlunya sebuah metode prediksi cuaca yang baik sehingga dapat mengurangi kerugian dan kerusakan. Parameter maksimum dalam pengembangan perancangan informasi prakiraan cuaca berbasis Jaringan Saraf Tiruan / JST (Backpropagation) dengan menambah inputan data curah hujan, suhu, kelembaban, penyinaran matahari, tekanan udara, arah angin dan kecepatan angin. Penelitian ini dilakukan di wilayah Bandar Udara Radin Inten II Lampung. Data yang digunakan dalam penelitian ini adalah berupa data harian kondisi meteorologi di wilayah Bandar Udara Radin Inten II Lampung dari Stasiun Meteorologi Radin Inten II selama 3 tahun terakhir yaitu dari tahun 2017 hingga tahun 2019. Data tersebut dibutuhkan sebagai data masukan untuk algoritma yang akan digunakan dalam penelitian. Berdasarkan pada hasil penelitian, diperoleh akurasi pelatihan terbaik sebesar 100% pada arsitektur jaringan syaraf tiruan dengan parameter fungsi pelatihan levenberg-marquardt (trainlm) dan scaled conjugate gradient (trainscg), fungsi aktivasi sigmoid biner dan sigmoid bipolar, dan jumlah neuron 20, 40, 60, 80, dan 100. Sedangkan akurasi pengujian terbaik sebesar 74.359% pada arsitektur jaringan syaraf tiruan dengan parameter fungsi pelatihan gradient descent wit momentum and adaptive learning rate (traingdx) dan fungsi aktivasi sigmoid biner (logsig) dan jumlah neuron 20 dan 80.Kata kunci: Penerapan Jaringan Saraf Tiruan, Prakiraan Cuaca, Bandar Udara Radin Inten II Lampung.Weather prediction is needed in planning daily life, one of which is to make decisions. The success of a weather prediction will have an impact on decision making in various fields, including agriculture and aviation. In the field of aviation, weather prediction is important to determine the time, location, direction of motion, altitude and plan the movement of aircraft to take into account operational disturbances that can be caused if the weather is bad and also to consider in determining flight routes or determining in carrying additional fuel if in an emergency. In the case of the aircraft having to return due to unfavorable weather conditions. Therefore the need for a good weather prediction method so as to reduce losses and damage. In this case the author tries to focus on the maximum parameters in the development of weather forecasting information design based on Artificial Neural Networks / Backpropagation by adding input data of rainfall, temperature, humidity, sunlight, air pressure, wind direction and wind speed. This research was conducted in the area of Radin Inten II Airport, Lampung. The material used in this study is in the form of daily data on meteorological conditions in the Radin Inten II Lampung Airport area from the Radin Inten II Meteorological Station for the last 3 years, from 2017 to 2019. This data is needed as input data for the algorithm that will be used in study. Based on the research results, the best training accuracy is 100% on the artificial neural network architecture with levenberg-marquardt training function parameters (trainlm) and scaled conjugate gradient (trainscg), binary sigmoid and bipolar sigmoid activation functions, and the number of neurons 20, 40, 60, 80, and 100. Meanwhile, the best test accuracy is 74,359% on the artificial neural network architecture with the training function parameters gradient descent wit momentum and adaptive learning rate (trainingdx) and binary sigmoid activation function (logsig) and the number of neurons 20 and 80. Keywords: Application of Artificial Neural Networks, Weather Forecast, Radin Inten II Airport Lampung
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.
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.
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.

Page 1 of 2 | Total Record : 15

 1   2 

Filter by Year

2023 2023


Reset
Filter By Issues
All Issue Vol 12, No 1 (2024): Jurnal Teori dan Aplikasi Fisika Vol 11, No 2 (2023): Jurnal Teori dan Aplikasi Fisika Vol 11, No 1 (2023): Jurnal Teori dan Aplikasi Fisika Vol 10, No 1 (2022): Jurnal Teori dan Aplikasi Fisika Vol 9, No 2 (2021): Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika Vol 8, No 2 (2020): Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika Vol 7, No 2 (2019): Jurnal Teori dan Aplikasi Fisika Vol 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika Vol 7, No 1 (2019): Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika Vol 4, No 2 (2016): Jurnal Teori dan Aplikasi Fisika Vol 4, No 2 (2016): Jurnal Teori dan Aplikasi Fisika Vol 4, No 1 (2016): Jurnal Teori dan Aplikasi Fisika Vol 4, No 1 (2016): Jurnal Teori dan Aplikasi Fisika Vol 3, No 2 (2015): Jurnal Teori dan Aplikasi Fisika Vol 3, No 2 (2015): Jurnal Teori dan Aplikasi Fisika Vol 3, No 1 (2015): Jurnal Teori dan Aplikasi Fisika Vol 2, No 2 (2014): Jurnal Teori dan Aplikasi Fisika Vol 2, No 2 (2014): Jurnal Teori dan Aplikasi Fisika Vol 2, No 1 (2014): Jurnal Teori dan Aplikasi Fisika Vol 2, No 1 (2014): Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika Vol 1, No 1 (2013): Jurnal Teori dan Aplikasi Fisika More Issue