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Leni Rumiyanti
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INDONESIA
Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156     DOI : -
Core Subject : Science,
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 15 Documents
Search results for , issue "Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika" : 15 Documents clear
Pengaruh Molaritas dalam Teknik Spray terhadap Performa Fotodetektor Berbasis ZnO Okky Fajar Tri Maryana; Anisa Fitri; Mohamad Samsul Anrokhi; Wahyu Solafide Sipatuhar; Eka Nurfani
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2706

Abstract

ZnO:Fe thin films has been successfully carried out by a simple spray pyrolysis method. The thin film was grown on ITO (Indium Tin Oxide) substrate with a metal-semiconductor-metal (MSM) structure. ZnO:Fe thin film characters as photodetector application include morphological structure, and electrical properties. SEM image results show the molarity difference can affect the particle size. The Current-Voltage (I-V) characterization shows that different solvent effects and molarity give different sensitivity. Sample ZnO:Fe 0.5M Ethanol has the highest sensitivity compared to other samples because it has a fairly low current and high bright current.
PENGARUH PENAMBAHAN CO-DOPING Mg/La TERHADAP KARAKTERISASI TiO2 SEBAGAI FOTOELEKTRODA Nurul Azmi; Ismail Ismail; Mursal Mursal
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2633

Abstract

Abstract. The effect of Mg/La co-doping addition on the caracteristics of TiO2 as photoelectrode have been studied. This study aims to investigate the effect of Mg/La co-doping concentration on the characteristics of TiO2. This study aims investigate the effect of Mg/La co-doping concentration on the characteristics of TiO2. Mg/La was varied from 0% mol, 0.4 / 0.6% mol, and 0.6 / 0.4% mol. Synthesis of TiO2 co-doping Mg/La was done by sol gel method. The resulting of powder pure TiO2 and co-doping Mg/La was made to paste, and was deposited on a glass substrate with a size of 2.5 x 2.5 cm and sintered at 600°C for 1 hour. Mg / La co-doped TiO2 layers were characterized using XRD, UV-Vis, and FTIR spectrometers. The results showed that TiO2 was the mos dominan phase appeared in pure TiO2 sample. The phase of MgO, MgTiO3, Mg2TiO4, and La2O3 were found in Mg/La co-doped TiO2 samples. The crystal size of Mg/La co-doped TiO2 was varied from 8.85 to 7.70 nm. In this research, we obtained that the energy gap was varied from 3.52 to 3.5 eV depent on co-dopant concentration. FTIR measurement showed groups of Ti-O, Ti-O-Ti, Ti-O-O, and H-O.Keywords: Co-doping Mg/La, photoelectrode, Sol Gel method, TiO2.
Aplikasi Sensor BH1750 Untuk Sistem Monitoring Pertumbuhan Tanaman Cabai Menggunakan Arduino Bertenaga Surya Terintegrasi Internet of Things (IoT) Syafrima Wahyu; Mohamad Syafaat; Agnes Yuliana; Revi Meliyani
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2713

Abstract

The purpose of this study is to design the monitoring system to observe the growth of Chili plant that is integrated with the Internet of Things (IoT) with the power source coming from solar panels. Important variables to support plant growth are soil moisture, ambient temperature as well as the right time and duration of watering. Measurement of light intensity is carried out by the BH1750 sensor. The measurement results of the sensor will be displayed on the LCD (Liquid Crystal Display) and can be accessed via an Android-based application. The result of testing the light intensity monitoring tools on chili plants showed good accuracy. The monitoring system that has been designed is equipped LCD that show variable result.
Rancang Bangun Mesin Replika Penghasil Gas Vulkanik sebagai Studi Awal Monitoring Erupsi Gunung Berapi umi salamah; Qonitatu Hidayah; Damar Yoga Kusuma
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2710

Abstract

Indonesia is one of the countries that has the third-largest number of volcanoes in the world. Several volcanoes are still active today. This places Indonesia prone to disasters from the volcano. One of the volcanic activities is characterized by the release of poisonous gases such as CO2. At a certain threshold, this poisonous gas can kill living things. This research has designed a gas-producing engine as a replica of volcanic gas. This machine is very supportive of the development of volcanic gas research on a laboratory scale because it has the advantage of being lighter, simpler construction, cheaper and portable machine construction process. The gas produced by the machine is tested using the Dragger X-am 7000. , CO2, H2S, SO2, and CO. The results were obtained for 60 seconds of starting the engine, namely CH4 2.0% LEL, CO2 1.6% Vol, H2S 4.3 ppm, SO2 1.0 ppm, and CO 271 ppm.
Analisis Perhitungan Gaya Berat pada Tongkat Gayung Lipat untuk Mengetahui Efektifitas Pengungkit Jenis Tiga Feri Hidayatullah Firmansyah; Tasha Nabila; Fauziah Mas'ula Soffa; Yusri El Fahmi
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2672

Abstract

. Tongkat Gayung Lipat is a tool initiated by a PKM-KC team at the University of Education of Indonesia. The Tongkat Gayung Lipat is a tool that can help humans' outdoor activities. It has four main functions such as a mountain climbing tool, a container for taking water both far or near located, a flashlight in the stick handle serves as a lighting tool, and a knife in the stick handle serves cutting objects. Human needs when going on vacation and the limitations of the water dipper in tourist attractions are the reasons for making this tool. This tool was initiated to make it easier for people to do activities in the bathroom and do other activities outdoor (indoor and outdoor). Thus, to see the effectiveness of the tool, a trial was carried out by considering the load and human strength when lifting water. The calculation carried out using the third type of lever of physics laws approach which can provide a precise calculation of the effectiveness of objects. The analysis was carried out using the fourth lever type of physics law approach by calculated gravity, mass, and force. The result of the calculation was there is three comparisons of gravity. They are  23.6 N, 23.3 N, and 12.03 N. With these results, it is necessary to analyze the effectiveness of the Tongkat Gayung Lipat.
Sintesis Ferroelektrik BaZrxTi1-xO3 Dengan Variasi Zirkonium Terhadap Struktur Kristal dan Konstanta Dielektrik Yunita Subarwanti; Erni Mariana
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2711

Abstract

This study aims to determine influence addition Zr against the crystal structure and dielectric constant; and to know the influence of variations temperature sintering on addition mole Zr. Barium Zirconium Titanate (BaZrxTi1-xO3) have been made with variation zirconium (Zr) 1%, 5%, 10%, and 20% by solid state reaction method, that is blanded BaTiO3, TiO2 and ZrO2 powder. BaZrxTi1-xO3 powder is printed with die pressing and press hidrolik, then the samples were sintered by furnace at 900oC and 1000oC with holding time 2 hours. Characterization of samples use X-Ray Diffraction and Resistance Capacitance Inductance (RCL meter). Based on result obtained, the larger Zr content cause dielectric constant decreasing because crystal structure have been change from tetragonal (Zr = 1% and 5%) to cubic (Zr = 10% and 20%). The result from X-Ray Diffraction already match with data base ICDD no#360019. Measurement of dielectric constant (K) performed in the frequency range 1 kHz to 100 kHz and the highest value at Zr content 1%, because The dielectric constant decreasing with the larger Zr content. The maximum dielectric constant is obtained at mol Zr 5% and sintering temperature 1000oC, that is 150. The minimum dielectric constant is obtained at mol Zr 20% and sintering temperature 900oC, that is 62.
Rancang Bangun Alat Pengukur Suhu Real Time Laboratorium menggunakan Protokol MQTT Berbasis Internet of Things Indrawata Wardhana; Vandri Ahmad Isnaini; Rahmi Putri Wirman; Rita Syafitri; Akhmad nasuha
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2690

Abstract

The stable temperature in the laboratories is the major requirement for ensuring safety at work. The changes in the temperature which are oftentimes caused by precisely unrecognized factor may provide hazardous impacts on humans who are working in such place. Similar researches were conducted; however, they did not use NodeMCU as a microcontroller and MQTT protocol. This study tried to build a real-time temperature observation system using MQTT protocol based on the Internet of Things which has a fast delivery speed message. The temperature and humidity were captured by using DHT22 sensor that were then stored in database for one month. The result showed that the temperature change of the laboratory could be rapidly detected through the tests process on a certain heat-produced device. It could be analyzed periodically using the real-time application so that the impact of temperature rise could be detected quickly.
Pengukuran Modulus Geser Baja Menggunakan Analisis Osilasi Pegas-Massa dengan Software Logger Pro Samuel Hia; Albertus Hariwangsa Panuluh
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2606

Abstract

A steel shear modulus measurement has been conducted using spring-mass oscillation analysis. The purpose of this study is to determine whether the spring-mass oscillation analysis method can measure the shear modulus of the steel. In this study, springs that are used are made of steel with a spring radius of 7,86 mm, a spring wire diameter of 0.817+-0,001 mm and there is no distance between the coil springs. The length of the spring is varied 7 times, i.e., 4.75+-0,01 cm, 5.36+-0,01  cm, 5.89+-0,01  cm, 6.81+-0,01 cm, 8.53+-0,01 cm, 9.44+-0,02 cm, and 10.87+-0,02  cm. The spring radius and the diameter of the spring wire are measured using a micrometer screw, while the spring length is determined using image analysis using the Logger Pro program. The spring constant is determined from the equation of the results of the position graph fitting (x) with respect to time (t) load on the oscillating spring-mass system. The value of the shear modulus can be determined from the constants on the graph of the relationship of the spring constant to the spring length following the equation from Sommerfeld. The research measures the shear modulus is 1.24+-0,02 GPa.
Perancangan Sensor LVDT dan Potensiometer Geser Sederhana Sebagai Alat Potensial Pendeteksi Pergeseran Tanah Tri Siswandi Syahputra; Heru Asyubi; Eko Satria
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2714

Abstract

A preliminary study on the design of a Linear Variable Differential Transformer (LVDT) sensor and a sliding potentiometer has been carried out. It is a distance measuring sensor that can be used as a ground shift sensor. This study aims to develop a new type of low cost mechanical sensor which has a high enough accuracy. The LVDT sensor is built using affordable materials such as PVC pipes, winding wires and iron cores, which is varied based on the number of primary coil and its diameter. While the potentiometer sensor is prepared by using linear bearing using electrode sheets of nickel and copper which is arranged by implemented the concept of the Newton-Wheatstone Bridge. The measurement value shows that the LVDT sensor with the number of primary coil of 110 and a diameter of 4 mm can measure with an accuracy of 0.5 mm and a range of more than 4 cm. While the sliding potentiometer using a sheet of copper electrodes can measure 0.5 mm with a range of more than 4 cm. The average error shown by the LVDT sensor and the sliding potentiometer is 5.2% and 6.4%, respectively.
Kajian Impelementasi Quality Control Faktor Bright Band dan Atenuasi Radar Cuaca C-Band Deffi Putri; Eko Yulianto Nugroho; Januar Rahmad Pratama
Jurnal Teori dan Aplikasi Fisika Vol 9, No 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.2701

Abstract

Weather radars have several limitations there are bright band echoes and attenuation of electromagnetic wave from radar’s beam. The purpose of this research is to conduct an analysis respect to the result of quality control from both of the limitations in 2019 which divide into four case study. Freezing level height of radiosonde used for support the identification activity of BBC phenomena. The result of BBC can reduce the BBE patterns however, it unable to function optimally in reducing all parts of the BBE patterns. Rainfall attenuation correction that have been done shows various results, either quantitatively or qualitatively. Attenuation correction is able to increase the rainfall value in product image SRI and PAC qualitatively. Quantitative analysis shows that the r and MAE values after attenuation correction of hourly rainfall have a good value besides that the attenuation correction in daily rainfall data is able to improve the estimate by 62.5%.

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