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Jurnal Teori dan Aplikasi Fisika
Published by Universitas Lampung
ISSN : 2303016X     EISSN : 25491156     DOI : https://doi.org/10.23960/jtaf.v14i01
Core Subject : Science, Engineering,
Astronomy Electrical & Electronics Engineering Materials Science & Nanotechnology Physics
We invite authors to submit manuscripts of up to 10 pages, prepared in accordance with the author guidelines. The scope of this journal includes, but is not limited to, the following fields: 1. Theoretical Physics Classical Mechanics Electromagnetics Thermodynamics Statistical Mechanics Quantum Mechanics Theory of Relativity Quantum Gravity Astrophysics Cosmology 2. Earth Physics (Geophysics) Geothermal Geoelectrics Seismics Geomagnetics 3. Materials Physics Nanomaterials Metals and Corrosion Magnetic Materials Thin Films Photocatalysts/Catalysts Semiconductors Superconductors Ceramics Polymers 4. Electronics and Instrumentation Sensors Biomedical Instrumentation Agricultural Instrumentation Environmental Instrumentation Biophysics Computational Physics Lasers 5. Nuclear Physics Reactor Safety Neutronic Analysis Fuel and Waste Management
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 395 Documents
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Uji Viskositas Fluida Menggunakan Transduser Ultrasonik sebagai Fungsi Temperatur dan Akuisisinya pada Komputer Menggunakan Universal Serial Bus (USB) Maria Yeni Hermawati; Sri Wahyu Suciyati; Warsito Warsito
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 1 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i1.36

Abstract

Telah dilakukan penelitian uji viskositas fluida menggunakan transduser ultrasonik sebagai fungsi temperatur dan akuisisinya pada komputer menggunakan universal serial bus yang bertujuan untuk mengetahui nilai viskositas terhadapa perubahan temperatur pada oli motor SAE 20W-50 dan SAE 10W-40. Nilai viskositas didapatkan dari perubahan waktu tempuh gelombang pada transduser ultrrasonik MA40E7R/S. data diolah menggunakan bahasa pemrograman delphi 7 yang mengubah sinyal output transduser menjadi hasil viskositas oli motor SAE 20W-50 dan SAE10W-40. Rata-rata hasil pengukuran oli motor SAE 20W-50 pada temperatur 30oC 3,306, pada temperatur 35oC sebesar 3,771, pada temperatur 40oC sebesar 3,733, pada temperatur 45oC sebesar 3,848, dan pada 50oC sebesar 3,309. Dari penelitian ini diketahui jika temperatur semakin tinggi maka viskositas menurun. Kata kunci: Viskositas, Ultrasonik
Perbandingan Kinerja Filter Digital IIR dan FIR untuk Mereduksi Derau Interferensi Jaringan Listrik 60 Hz pada Sinyal EKG Elisabhet Yori Vitariasni; Arif Surtono; Gurum Ahmad Pauzi
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 1 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i1.37

Abstract

Telah dilakukan perbandingan kinerja filter IIR dan FIR dalam meredeksu interferensi jaringan listrik 60 Hz pada sinyal EKG. Penelitian ini bertujuan untuk mengetahui kinerja filter IIR dan FIR serta membandingkanya secara kualitatif dan kuantitatif. Data EKG yang mengandung noise difilter sehingga didapatkan data EKG yang bebas derau. Filter IIR menggunakan metode Pole Zero sedangkan Filter FIR menggunakan metode Windowing . Hasil penelitian menunjukkan bahwa filter IIR memiliki kinerja lebih baik dibandingkan filter FIR dalam mereduksi derau inteferensi jaringan listrik 60 Hz. . Kinerja tersebut dapat diketahui dari nilai SNR filter IIR rata-rata sebesar 32.2008 dan SNR filter FIR metode Rectangular Windowing rata-rata sebesar 15.6812, SNR metode Bartlet Windowing rata-rata sebesar 19.1354, SNR metode Hanning Windowing rata-rata sebesar 23,2296. Kata Kunci: IIR, FIR, Filtering, EKG
Karakteristik Lapisan TiO2 Metode Spray dalam Dye-Sensitized Solar Cell Dewi Mustikasari, Agus Supriyanto, Risa Suryana
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.39

Abstract

Pengaruh Lama Pemanasan, Pendinginan secara Cepat, dan Tempering 600 oC terhadap Sifat Ketangguhan pada Baja Pegas Daun AISI No. 9260 Desti Nurjayanti, Ediman Ginting, Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.40

Abstract

Studi Pengaruh Suhu Dan Tekanan Udara Terhadap Daya Angkat Pesawat Di Bandara S. Babullah Ternate Akhmad Fadholi
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.41

Abstract

There are three levels of operation in aviation that very important and related to meteorology. They are take off, flight (cruising), and landing. The third phase requires meteorological information. Some of meteorological elements may influence the aircraft ability at critical moments are temperature and air pressure. Temperature and pressure are two meteorological elements are interrelated, because the air pressure with temperature will determine the density of the air and the lift of aircraft. The result, at the Sultan Baabullah International Airport of Ternate suggests that the influence of temperature and air pressure is very strong. Using F-Klim 71 data from Ternate meteorological station since 1981 to 2008, air temperature has the strongest effect in March and September with 99.42% and 99.40%. The air pressure has the smallest influence March and September with 0.10% and 0.582%. The temperature with air pressure have a very strong influence with 99.99% for all of the years. Keyword: Flight, Temperature, Air pressure, Density, Lift.
Perbandingan Hasil Uji Fisis Komposit Polimer Berbasis Perlit Dengan Batu Apung Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.42

Abstract

Two kinds of polymer composites hava been made from the basic materials: (a) of an epoxy resin with a river sand aggregate which was mixed with a pumice, and (b) of an apoxy resin with a silica sand aggregate which was mixed with perlite. The preparation of samples used the same percentage of weight, and the percentages of epoxy resin with a thinner were varied from 45 gr, 60 gr and 75 gr. Based on the physical comparative test, such as, density, porosity, presure strength, and sound-proof capacity, it is obtained that sample (b) is better than sample (a) if it is used as a construction material. Keywords: pumice, perlite, polymer composites, resin epoxy.
Fabrikasi dan Karakterisasi Elektroda untuk Sistem Capasitive Deionization(CDI) pada Proses Desalinasi Larutan NaCl dengan Metode Freezing-Thawing Iim Fatimah, Endarko
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.43

Abstract

An electrode has been made for capacitive deionization (CDI) technology during the process of desalination of NaCl solution using freezing-thawing method. The electrodes are made of a combination of coconut shell activated carbon, graphite and polyvinyl alcohol by varying the material composition and the number of cycles during the freezing-thawing process. Carbon electrode test results using cyclic voltametric method showed the peak of oxidation reduction in its voltamogram cyclic which is the peak of cathode current 0.6 mA on potential reduction of - 0.6 V therefore the electrode has a capacitance per unit area of 0,14 F/g. Electrode test results show that the greatest capacitance and the highest electrode porosity obtained on the composition of the activated carbon of coconut shell: polyvinyl alcohol (PVA): graphite is 18 : 1: 6. In this research the system were arranged in a monopolar and bipolar to compare the efficiency of the reduction of the salt level. Based on the tests carried out, monopolar arranged structure shows 37% of salt levels reduction in five minutes while the bipolar arranged structure only able to reduce salt levels of about 20 % in five minutes. It showed that the monopolar arranged structure is able to give a better outcome. Keywords: hydrogel PVA, carbon,capasitive deionization, cyclic voltametri, desalination.
Identifikasi Kandungan Radon (Rn-222) pada Bahan Bangunan Batu Bata di Kawasan Aceh Besar Evi Yufita, Rini Safitri
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.44

Abstract

The research about identifying of radon (Rn-222) esposure in a brick manufacture has been done. The aim is to identify the behavior of radon before and after burning in a brick factory in Aceh Besar district. Samples were taken at 6 villages namely Lhiep village, Krueng Anoi, Lamreung, Lambada Peukan, Kleng Cot Arun, and Neuheun. Bricks used as many as 60 pieces of the whole village. Measurement technique using a short-term radon monitoring tools Model 1027 Profetional Countinue Radon Monitor countinue with sampling methods and performed for 12 hours. The results obtained showed that the average value of the highest radon concentration in the bricks before firing from the village Lhiep with 1.80 pCi / l and the lowest in the village of Lambada Peukan of 0.72 pCi / l. In contrast, values obtained after burning an average radon concentration was highest in the village of Lambada Peukan was 0.52 pCi / l and the lowest in the Lhiep of 0.14 pCi / l. High or low radon concentration value on the bricks before burning than influenced than clay soils (clay) used are also expected due to geographical area (upland or lowland), whereas for bricks after firing is influenced by combustion processes that cause cracks in brick so that radon is the brick can come out through the slit bricks. So the bricks are in Aceh Besar district after the test was still relatively low at 2.0 pCi / l and
Aplikasi Software 3 Dimensi Inversi Dalam Interpretasi Sebaran Air Tanah R. R. Wahyuningrum, Budi Legowo, Darsono
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.45

Abstract

3-D resistivity inversion study to determine the distribution of water land in the hamlet Platarejo and hamlet Selorejo been calculated using geoelectric dipole- dipole configuration. Through data processing by using software Res2Dinv and software Res3Dinv. The result obtained from the software Res2Dinv the form of two dimensional cross section with colour imaging for each layer. Result Res2dnv processing software is then input into the software so as to provide a color image Res3Dinv deployment in 3 Dimensional subsurface. From the results of the processing that there are 6 (six) layers having difference thicknesses. Processing results showed the depth of 0,00 m to 10,4 m only have one type of layer is sandy silt till which has resistivity values ranging from 5,5 Om to 14,3 Om. At a depth of 10,4 m to 122,9 m was identified as a layer in the from of tuffaceous sandstone, at a depth of 12,9 m to 18,6 m identified as limestones. So that it can be seen that the distribution of surface soil water was found at a depht of 10,4 m and close the second trajectory is at a distance of 30 m to 90 m and a third track at a distance 30 m to 100 m. Keyword: Resistivity, 3 Dimensional, Groundwater, Platarejo.
Pengaruh Variasi doping Lantanum pada Barium Titanat (Ba1-xLaxTiO3) terhadap Struktur Mikro dan Sifat Ferroelektrik N. Nurhadi, A. Jamaluddin, Y. Iriani
Jurnal Teori dan Aplikasi Fisika Vol. 1 No. 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.46

Abstract

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