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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 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika" : 15 Documents clear
Analisis Laju Korosi pada Sistem Energi Listrik Alternatif Berbasis Elektrolit Air Laut Sinta Setiani Pangestu; Gurum Ahmad Pauzi; Sri Wahyu Suciyati
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1821

Abstract

It has been realized an instrument of generating electric power by using a series of Cu-Zn electrode and two different electrolyte types, that are pure seawaterand seawater that has been filtered and added sodium bicarbonate (NaHCO3). The instrument is designed  to do charging and discharging seawater electrolyte manually. Electrolyte cell consist of 20 cell with 20 pairs of copper and zinc electrodes arranged in series. The instrument measurements are measuring the illumination of LED 3 watts and mass of zinc electrode. The Instrument was testedfor 72 hours  with three times electrolyte charging every 24 hours. The result showed that the illumination were generated by instrument with both of electrolyte will decrease by time. The seawater was filtered and added NaHCO3 can turn on  3 wattsLED longer than the pure seawater.On the third day, corrosion rate of  zinc electrode with pure seawater electrolyte is 9 times higher than seawater was filtered and added NaHCO3.
Analisa Pengaruh Penambahan Variasi Bubuk Andesit Terhadap Karakteristik Kuat Tekan Mortar Herullah Herullah; Pulung Karo Karo; Yayat Iman Supriyatna; Muhammad Amin
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1820

Abstract

The effect of andesit powder addition variety on the properties of the mortar compressive strength was carried out. This study aims to investigate  the effect of andesit powder addition variety on the properties of mortar compressive strength which is added on mortar blend by comparing mortar without the addition of andesit powder. Mortar with various andesit powder contents (10, 20, 30, 40 and 50 % by weight respectively) as partial replacement of portland cement at the age of 7, 14 and 28 days curing. The results show that the compressive strength of each ages with andesit powder addition is higher than mortar without the addition of andesit powder. The highest compressive strength are 11.8, 14.3 and 17.4 MPawith andesit powder respectively and 5.6, 7.56 and 11.00 MPa regarding to the mortar without andesit powder. Therefore 30% seems to be the optimal as partial replacement cement level. The results show with decreasing porosity on the mortar, the density will be greater and solid, it will decrease the absorption. The results of X-Ray flourescene indicate that the chemical element of Si, Al and Fe increase with increasing the dosage of andesit powder which is added on mortar blend. Consequently the Ca element may decrease by addition of andesitpowder on mortar endlessly. The X-Ray Diffraction shows the coestite and hematite phase after temperature 900 oC calcination.
Investigasi Geologi dan Geolistrik Untuk Menafsirkan Keberadaan Air Tanah Dangkal Di Ambarawa, Lampung Rustadi Rustadi; Gurum Ahmad Pauzi; Opik Taufik
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1832

Abstract

East  Ambarawa  has  a  large  agricultural  land  prosfek  for  rice  cultivation.  Limitations  of irrigation facilities, caused land fields are only productive in the rainy season. Utilization of ground water to be an alternative to supporting water supply. For this purpose, a geoelectric survey has  been conducted to   map   the   presence   of   shallow   groundwater   in   three lines   with   random  positions  using  Pole-pole configurations.  Through  the  use  of  40  electrodes  with  a  total   length  of  200  m,  geoelectric image  is obtained  to  a  depth  of  70  m.  The  presence  of  ground  water  is interpreted  to  be  in sedimentary layers, at depths  of  12   -  50.  Underlying  sediment  layers  are  composed  of   igneous  rocks  that  correlate with the formed Kerawang hill.
Material Absorber Gelombang Elektromagnetik Berbasis (La0.8Ba0.2)(Mn(1-x)/2ZnxFe(1-x)/2)O3(x = 0 – 0,6) Intan Wandira; Pulung Karo Karo; Wisnu Ari Adi
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1827

Abstract

Electromagnetic wave absorber materials with(La0.8Ba0.2)(Mn(1-x)/2ZnxFe(1-x)/2)O3(x = 0-0,6) had been researched. This magnetic material was synthesized by using solid state reaction method and a suitable composition for the application of a microwave absorber material had been obtained, namely (La0.8Ba0.2)(Mn0.4Zn0.2Fe0.4)O3 (x = 0,2).Precursors use wereLa2O3, BaCO3, ZnO, Fe2O3, dan MnCO3. The mixture was mixed with High Energy Milling for 5 hours then sintered at 1000 ° C for 5 hours.The result of refinement of X-ray diffraction pattern shows that (La0.8Ba0.2)(Mn0.4Zn0.2Fe0.4)O3material had a single phase and a trigonal structure. The surface morphology of the sample had a uniform spherical shape. The results of absorbance analysis of samples to electromagnetic waves in the range of 8-12 GHz was 96%. Thus, the (La0.8Ba0.2)(Mn0.4Zn0.2Fe0.4)O3 (x = 0,2) material was a potential candidate for applications of electromagnetic wave absorber material.
Pengaruh Variasi HCl Pada Pemurnian Silika Berbasis Batu Apung Jayanti Pusvitasari; Posman Manurung; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1833

Abstract

Silica from pumice natural rock was extracted by varying HCl of 1M and 2M. Fristly, pumice was heated to 400°C for 4 hours to activate the component of material.Three steps were used in obtaining pure silica. Silica extraction by using NaOH, silica titration by using H2SO4, and purification silica with HCl. The purified powder was calcined at 800°C. The characterization of XRD (X-Ray Diffraction) and SEM-EDS (Scanning Elektron Microscopy - Energy Dispersive Spectrometry) were performed for samples after and before purification to know the phase structure and microstructure and pumice powder content. The XRD results was show diffraction pattern of the amorphous shaped SiO2 with some crystalline peaks is an other oxide compound than SiO2 for the starting material, and an anorite crystal phase in the HCl 1M and 2M variations. This is confirmed by EDS results what showing the silica content has the highest percentage of 65.88% for the raw material, 67.83% for HCL 1M and 69.63% for HCl 2M variation after purification. While the SEM results identified the microstructure for the raw material has a clear but not entirely homogeneous that is the identification of the sample in an amorphous state, whereas the sample after purification of the microstructural result shows non-homogeneous grain size, unclear grain boundary boundaries and an algomeration (agglomeration ) which is also the identification of the sample in an amorphous state.Silica from pumice natural rock was extracted by varying HCl of 1M and 2M. Fristly, pumice was heated to 400°C for 4 hours to activate the component of material.Three steps were used in obtaining pure silica. Silica extraction by using NaOH, silica titration by using H2SO4, and purification silica with HCl. The purified powder was calcined at 800°C. The characterization of XRD (X-Ray Diffraction) and SEM-EDS (Scanning Elektron Microscopy - Energy Dispersive Spectrometry) were performed for samples after and before purification to know the phase structure and microstructure and pumice powder content. The XRD results was show diffraction pattern of the amorphous shaped SiO2 with some crystalline peaks is an other oxide compound than SiO2 for the starting material, and an anorite crystal phase in the HCl 1M and 2M variations. This is confirmed by EDS results what showing the silica content has the highest percentage of 65.88% for the raw material, 67.83% for HCL 1M and 69.63% for HCl 2M variation after purification. While the SEM results identified the microstructure for the raw material has a clear but not entirely homogeneous that is the identification of the sample in an amorphous state, whereas the sample after purification of the microstructural result shows non-homogeneous grain size, unclear grain boundary boundaries and an algomeration (agglomeration ) which is also the identification of the sample in an amorphous state.
Analisis Kecelakaan Reaktor Transient Over Power (TOP) Reaktor SCWR (Supercritical Cooled Water Reactor) Abdullah Haris; Yanti Yulianti; Syafriadi Syafriadi
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1828

Abstract

Research about TOP reactor accident analysis for SCWR reactor used thorium fuel has been done. The objective of this research is to solve point reactor kinetic equation by Taylor method and to analyze TOP reactor accident. Point reactor kinetic equation has first order differential equation to calculate relative power behavior due to reactivy which can be solved with MATLAB program. Initial reactivity used three variation these are 0,0025; 0,00315; and 0,005. The analysis results showed exponential pattern for reactivity without feedback had obtained power density was 5314,72 Watt/cm3 ­and fuel temperature was 13717,5 K at t = 1 s.  While on reactivity used feedback has given stable conditions had obtained power density was 204,765 Watt/cm3 and fuel temperature was 636,1 K at t = 1 s.
Analisis Laju Korosi dan Kekerasan pada Stainless Steel 304 dan Baja Nikel Laterit dengan Variasi Kadar Ni (0, 3, dan 10%) dalam Medium Korosif Sinta Novita; Ediman Ginting Suka; Widi Astuti
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1822

Abstract

In this research, the analysis of corrosion rate and hardness on stainless steel 304 and lateritic nickel steel in corrosive medium has been done. The lateritic nickel steel used has different Ni content of 0, 3, 4, 6, and 10%. The corrosion rate was calculated using the weight loss method while the hardness was measured by the Rockwell method. The test results showed that the corrosion rate was highest in samples immersed in the corrosive medium H2SO4 3.5% for 7 days, that is equal to 8.39 x 10-3 mm/year for the SS-304. For lateritic nickel steel, the highest corrosion rate occured in the sample with 0% Ni in corrosive medium H2SO4 3.5% which is equal to 50.85 mm/year. The hardness of the samples decreased after corrosion. The result of XRD analysis showed that SS-304 steel has an Fe-g (ferrite) and Fe-g (austenite) phase while the lateritic nickel steel has Fe phase. However, Ni phase was also formed in lateritic nickel steel with Ni content of 6% and Fe-g (austenite) phase in lateritic nickel steel with Ni content of 10%. The result of SEM characterization showed that the corrosion product formed is pitting corrosion with different hole diameter. The result of EDX analysis showed the presence of  elements of O, Na, and Cl on corroded samples in the corrosive medium NaCl 3.5%.
Perancangan Instrumentasi Monitoring Kualitas Akustik Ruangan Berdasarkan Tingkat Tekanan Bunyi dan Waktu Dengung Agung Gumelar; Gurum Ahmad Pauzi; Arif Surtono
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1835

Abstract

The room acoustic measurement based on the sound pressure level and reverberation time was done in Al-Wasi’I mosque in Lampung University. The measurement of sound pressure level and reverberation time used 8 microphones which were connected to the internal soundcard of a laptop with a multiplexer as a data selector, while the acquisition system and signal processing used Matlab r2014a. The measurements were conducted in 64 points distributed inside the room. The measurement results for sound pressure level showed an average of 61,95 dB. The data of sound contour showed differences in each measured point of no more than 6 dB so that the sound pressure was evenly distributed. The reverberation time measurement result was 3,03 seconds, where this reverberation time far from optimal reverberation time of 0,90 to 1,20 seconds. The overall of acoustic quality in the praying room of Al-Wasi’I mosque in Lampung University was not good because it did not meet a proper acoustic sound requirements.
Karakteristik Kekerasan dan Struktur Kristal Cordierite Berbasis Silika Sekam Padi dengan Penambahan Alumina (0, 20, 25, dan 30 wt%) Nindy Elyta Mawarty; Simon Sembiring; Rudy T.M. Situmeang
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1829

Abstract

The synthesis, phase structure and hardness analysis of cordierite ceramic has been done with addition of alumina 0, 20, 25, and 30wt%. Magnesium and alumina from Sigma-Aldrich has been used as raw materials while the silica was obtained from extraction of rice husk used 5% KOH and 10% HCl with sol gel method. This cordierite synthesis used solid state method and sintered at 1200oC for 3 hours. Hardness analysis was determined by Microhardness Tester while the phase structure was determined by X-Ray Diffraction (XRD). Hardness value that obtained for C0, C20, C25, and C30 were 50,03 : 52,44 : 35,69 : and 50,46 kgf/mm2 repeatedly. It was proved that excess alumina will increase hardness value. The XRD patterns revealed that cordierite, corundum, spinel, cristoballite, and periclase were formed in the samplesKarakteristik Kekerasan dan Struktur Kristal Cordierite Berbasis Silika Sekam Padi dengan Penambahan Alumina (0, 20, 25, dan 30 wt%)
Analisis Percepatan Getaran Tanah dan Tingkat Kerentanan Tanah di Daerah Lampung Septika Locita; Gurum Ahmad Pauzi; Amir Supriyanto
Jurnal Teori dan Aplikasi Fisika Vol 6, No 1 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i1.1824

Abstract

The measurement of peak ground acceleration and ground vulnerability index in Lampung area has been done. This study aims to analyze the acceleration of ground vibration and ground vulnerability index with soil types namely, entisol, inceptisol and ultisol. The tool used to perform the measurement is the vibration meter VB-8213. The results of the analysis show that changes in the acceleration value of ground vibration and ground vulnerability have the same pattern of change with distance. The further distance to the vibration source the acceleration value of ground vibration and ground vulnerability index will be smaller. The greatest vibration acceleration value is found in ultisole and inceptisol soil type. The smallest vibration acceleration value of the soil type is entisol. While the value of ground vulnerability index for all types of soil entisol, inceptisol and ultisol have relatively small ground vulnerability index.

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