Jurnal Teori dan Aplikasi Fisika
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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<![CDATA[Desain dan Karakterisasi Penggunaan Sensor Efek Hall UGN3503 untuk Mengukur Arus Listrik pada Kumparan ]]>
<![CDATA[Johan Wahyudi, Gurum Ahmad Pauzi, Warsito]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.963
<![CDATA[Hall effect is a deflection of electricity phenomena (electrons) in the conductor plate because of the magnetic fields effect. UGN3503 is a sensor with Hall effect principle, In this study UGN3503 sensor used to measure the electric current in the coil Leybold P6271 with non destructive method. Microcontroller processing results is an electric current measured by system and displayed on a LCD 20x4 in Amperes. Research data were taken 40 times with variations of the electric current ranging from 1 Amperes to 4,9 Amperes. calculated based on these data the average error that occurred in the measurement gauge amounted to 1,44%. Keywords: Hall Effect, UGN3503, ATMega8535.]]>
<![CDATA[Perbandingan Hasil Uji Fisis Komposit Polimer Berbasis Perlit Dengan Batu Apung ]]>
<![CDATA[Pulung Karo Karo]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.956
<![CDATA[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.]]>
<![CDATA[Analisa Rugi-Rugi Serat Optik Sebagai Potensi Aplikasi Sensor Weigh In Motion (WIM) Lima Lekukan ]]>
<![CDATA[Deajeng Wulandari, Mohtar Yunianto, Hery Purwanto]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.964
<![CDATA[Fiber optic loss yielded from macrobending with fivebending model prototype. The purpose this study is to determine the influence of scratches variation toward the loss as a potential Weigh In Motion (WIM) sensor applications to plastic optical fiber (POF) diameter 0,5mm.. Pressure influence toward POF loss done up to 2 mm shift. LED, as light source, transmits the light through the fiber and received by LDR as detector. The output is voltage displayed on the computer. Pressure caused by a shift made the fiber is depressed and formed fivebending so that the loss is greater. Two scratch, three scratch, without a scratch have applied. The study result show that the more scratches, the loss was greater . Every the loss value caused by giving certain mass. The highest sensitivity when three scratches was applied which has correlation coefficient R2 0,99744 with gradient 1,2264 so this model have has the potential in Weigh In Motion (WIM) sensor applications. Keyword: POF, scratches, five bending, WIM]]>
<![CDATA[Penerapan Metode Dinamika Molekul untuk Pembelajaran: Konsep Titik Leleh dan Perubahan Wujud ]]>
<![CDATA[Widiasih, Herawati, Heni Safitri, Artoto Arkundato]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.965
<![CDATA[Molecular dynamics method has been applied to model the phase transition of the aluminium (Al). We used the LAMMPS molecular dynamics code to simulate the physical process of the phase transition and observing the dynamics of atoms by using Jmol vizualitation code. From the simulation data we found that the phase transition where the melting point of the material is, can be observed at temperature T = 1059,75 K. In this view we may use the molecular dynamics method as an innovative model of physical learning model in senior high school level, as an alternative of dry lab. Keywords: Molecular dynamics method, Phase transition, Melting point, LAMMPS.]]>
<![CDATA[Identifikasi Kandungan Radon (Rn-222) pada Bahan Bangunan Batu Bata di Kawasan Aceh Besar ]]>
<![CDATA[Evi Yufita, Rini Safitri]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.960
<![CDATA[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]]>
<![CDATA[Karakteristik Lapisan TiO2 Metode Spray dalam Dye-Sensitized Solar Cell ]]>
<![CDATA[Dewi Mustikasari, Agus Supriyanto, Risa Suryana]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
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DOI: 10.23960/jtaf.v1i2.953
<![CDATA[Characteristic of TiO2 layers which was produced by spray method using airbrush equipment in the Dye-Sensitized Solar Cell (DSSC) were investigated from TiO2 surfaces morphology and I-V characteristics of DSSC. Spray application rate varied into 20, 40, and 60 times. Annealing temperature variation of TiO2 layers for each spray amount variation were 300ºC, 400ºC, and 500ºC, respectively. Dye was extracted from Spirulina sp chlorophyll which was used as sensitizer on the DSSC structures. The I-V characteristics of DSSC indicated that spray and temperature variation of TiO2 layers form diode characteristic curves. Generally, annealing temperature of 400ºC had Voc value higher than annealing temperature of 300ºC and 500ºC. The magnitude of Voc value was closely related with TiO2 high absorption to dyes. Furthermore, grain agglomeration models of TiO2 at 400ºC estimated that electrons diffused in TiO2 and then succeeded to attain the work electrode more than agglomeration models at 300ºC and 500ºC. Keyword : TiO2, DSSC, spray, I-V characteristics, Voc]]>
<![CDATA[Pengaruh Penambahan MgO Pada SiO2 Berbasis Silika Sekam Padi Terhadap Karakteristik Komposit MgO-SiO2 Dan Kesesuaiannya Sebagai Bahan Pendukung Katalis ]]>
<![CDATA[Reza Pahlepi, Simon Sembiring, Kamisah D. Pandiangan]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.966
<![CDATA[This research have been studied the effect of adding MgO on SiO on composite characteristics MgO-SiO22 based rice husk silica. Preparation of composites made by sol-gel method. composite calcined at of 700 °C. composites were characterized by SEM and catalytic activity test covers percent conversion and viscosity. Composite was applied as a catalyst. The results of the analysis of the microstructure (SEM) in the sample indicates that the sample has not formed granules, is a process of agglomeration, visible on the surface of the composite microstructure indicating Cluster MgO-SiO22 amorphous shape and EDS results showed the distributed main elements Mg, Si, and O in the sample. Test was conducted by catalyst applications test with transesterified reaction using pure coconut oil or VCO. Based on the test results of transesterification test for the six comparison samples, analysis of percent conversion and viscosity of the best results obtained on samples with a ratio of 1:1 with 82% conversion and viscosity of 12.693 mm /s. From the analysis of viscosity, the biodiesel obtained in the present study has not yet been said in the SNI biodiesel standard, because the viscosity values was obtained greater than the value of standard biodiesel. Keywords: MgO-SiO , sol-gel, transesterfication, SEM,% conversion and viscosity 2]]>
<![CDATA[Aplikasi Software 3 Dimensi Inversi Dalam Interpretasi Sebaran Air Tanah ]]>
<![CDATA[R. R. Wahyuningrum, Budi Legowo, Darsono]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.961
<![CDATA[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.]]>
<![CDATA[Kajian Pengaruh Ketebalan Lapisan P3HT Pada Sel Surya Organik Berbasis Bahan Organik Dan Polimer ]]>
<![CDATA[Fredicha Arya N., Agus Supriyanto, Fahru Nur Rosyid]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
Publisher : <![CDATA[Universitas Lampung ]]>
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DOI: 10.23960/jtaf.v1i2.967
<![CDATA[Organic solar cells with structure of FTO / PEDOT: PSS/P3HT/Klorofil/Al has been made. Fabrication of the active layer organic solar cells using spin coating method, while the counter electrode fabricated using evaporator method. Variations performed on P3HT layer with thickness variation is 1 layer, 3 layers, 5 layers and 7 layers. Characterization of optical properties in the visible conducted using UV-VIS spectrometer, while the electrical properties characterictics using the IV Meter El Kahfi in the dark and under irradiation. Characterization of organic solar cells was measured by using a Keithley 2602. Organic solar cell I-V characteristics measured tested under illumination with an intensity of 1000 Watt/m using xenon light in the area of 10 mm. Based on the results obtained organic solar cells with 7 layers of P3HT shows the I-V characteristics of the best results compared to other P3HT layer thickness. Keywords: organic solar cell, P3HT, klorofil, spin coating]]>
<![CDATA[Pengaruh Variasi doping Lantanum pada Barium Titanat (Ba1-xLaxTiO3) terhadap Struktur Mikro dan Sifat Ferroelektrik ]]>
<![CDATA[N. Nurhadi, A. Jamaluddin, Y. Iriani]]>
<![CDATA[ Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika ]]>
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DOI: 10.23960/jtaf.v1i2.962
<![CDATA[Deposition of thin films based ferroelectric materials barium titanate (BaTiO) doped lanthanum (BaLa1-xTiOx33) with mole variation of lanthanum (x) 1%, 3% and 5% were successfully grown on Pt/Si substrate by chemical solution deposition (CSD) method and it was prepared with spin coater process. Deposition of BaTiO and Ba3La1-xTiOthin films used temperature 800°C and holding time for 3 hours. The result characterization used X-Ray apparatus showed increase of lanthanum composition on crystal stucture barium titanate caused the diffraction angle shifts to the right (bigger) and intensity value increase. The result of GSAS software showed that lattice parameter and crystal volume decrease along with the increase of lanthanum composition on barium titanate structure. Scanning Electron Microscopy (SEM) characterization result showed that grain size decrease along with the increase of lanthanum mole dopant and average thickness of thin films about 300 nm. The result of Sawyer Tower method showed that all sampels are ferroelectric materials. The increase of lanthanum mole dopant caused coercive field smaller and remanent polarization bigger. Keyword: BaTiO3, crystal structure, ferroelectric, GSAS, lattice parameter.]]>
