Claim Missing Document
Check
Articles

Found 13 Documents
Search

Pengaruh Laju Penginjeksian Doping Sulfur terhadap Aktivitas Fotokatalis Nanotitania Menggunakan Metode Sol Gel Delfi Oktavia Amrani; Posman Manurung; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 7, No 2 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v7i2.2246

Abstract

Abstract. Synthesis of sulfur doped titania (S-TiO2) was carried out through sol-gel method. Titanium isopropoxide (TTIP), tween-80, isopropanol and sulfuric acid (H2SO4) as a source of sulfur doping were used as raw material. The aimed of this research is to study the effect of the rate of sulfur doping injection by using an injection pump toward S-TiO2 photocatalyst activity. Four sulfur doping samples were prepared with rate injection of 4 ml/30; 4 ml/60; 4 ml/90 and 4 ml/120 minutes respectively. Titania powder was calcined at temperatur of 450 oC for 5 hours. The sintered samples were tested for photodegradation of remazol yellow under UV irradiation. Physical characteristics were analyzed using transmission electron microscopy (TEM) and UV-Vis Spectrophotometer. The result of the UV-Vis spectrophotometer showed that sample with an injection rate of 4 ml/30 minutes showed higer photocatalyst activity with the particle size is (7,1 nm ± 1,9 nm)
Pemanfaatan Biomassa Sebagai Inhibitor Organik Pada Baja Aisi 1020 Di Universitas Lampung Rizky Damayanti; Pulung Karo Karo; Agus Riyanto
Jurnal Teori dan Aplikasi Fisika Vol 7, No 2 (2019): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v7i2.2055

Abstract

Research has been conducted on. The utilization of biomassa as an organic inhibitor in AISI 1020 steel at Lampung University. Samples of carbon steel AISI 1020 were immersed in 3% corrosive medium HCl without being given and given inhibitors of leaf extract  jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. inhibitors of leaf extract  jengkol, salam, ketapang and mango 0.8% for 4 and 7 days. Calculation of reduction in corrosion rate is carried out by the method of weight loss. The results showed that the addition of Biomasaa inhibitors was effective in reducing the corrosion rate of the samples with the greatest efficiency in the soaking of 7 days of ketapang leaves, which was equal to 74.22%. The results of XRD characterization showed that the phases formed were Fe and Fe2O3 in samples coated with inhibitors and in samples soaked without phase inhibitors Fe2O3 which were corrosion products. The results of SEM characterization showed that the microstructure of the surface of the sample after immersion in the inhibitor contained thin layers overlaying the steel in the sample not coated with the inhibitor, clearly visible cracks and holes indicating that the sample had undergone corrosion.
Pengaruh Aditif Ferro Boron (FeB) terhadap Karakteristik Serbuk Hematit (α-Fe2O3) Suci Pangestuti; Pulung Karo Karo; Parmadean Subayang; Candra Kurniawan
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1810

Abstract

The study about effect of ferro boron (FeB) additive towards characteristic of hematite (α-Fe2O3) powder has been done. The powders of FeB andα-Fe2O3 was milled with dry milling method using  Planetary Ball Mill (PBM) for 12 hours. Variation of FeB compositions are 4 and 8 wt.%. The milled powder was calcinedat temperatures of  900, 1000 and 1100oC. The characterization of the powders was performed by Particle Size Analyzer (PSA), true density, X-Ray Diffraction (XRD) and Vibrating Sample Magnetometer (VSM). The results effect of additives FeB showed an increasing of  particle size which related to decrease of true density of  sample  8 wt.% composition with a value 2.80 μm and 2.47 g / cm3. Respectively the  XRD characterization of sample with 8 wt.%composition with the calcination temperature of 1000 and 1100 °C showed that  iron boride (Fe2B)phase was formed. Maghemite (γ-Fe2O3) and magnetite (Fe3O4) was formed during calcination for non-additive sample. The VSM characterization showing the effect of the calcination temperatureare increasing the magnetic properties  and the addition of FeB tends to lower the magnetic properties within  samples before and aftercalcined.
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.
Pengaruh Variasi Penambahan Abu Ampas Tebu dan Serat Ampas Tebu Terhadap Sifat Fisis dan Mekanis Pada Mortar Muhammad Nursani; Pulung Karo Karo; Yanti Yulianti
Jurnal Fisika Indonesia Vol 24, No 3 (2020)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v24i3.55989

Abstract

Penelitian tentang pengaruh variasi penambahan abu ampas tebu dan serat ampas tebu terhadap sifat fisis dan mekanis pada mortar telah dilakukan. Bahan-bahan yang digunakan dalam penelitian ini antara lain abu ampas tebu, serat ampas tebu, semen portland, CaCl dan air. Abu ampas tebu diperoleh dari pembakaran ampas tebu pada suhu 700 ˚C selama 2 jam. Serat ampas tebu diperoleh dari pencacahan ampas tebu menggunakan mesin disk mill dengan ayakan berukuran 5 mm. Perbandingan semen, abu ampas tebu dan serat ampas tebu yang digunakan yaitu sampel A (90%:0%:10%), sampel B (85%:5%:10%) dan sampel C (80%:10%:10%), dengan penambahan CaCl sebesar 5% dari massa total dan 250 ml air. Pengujian yang dilakukan yaitu uji fisis (daya serap air dan kerapatan) dan uji mekanis (kuat tekan, kuat lentur dan kuat tarik belah) serta karakterisasi scanning electron microscope-energy dispersive x-ray spectroscopy (SEM-EDS). Mortar sampel A masuk dalam kategori mortar tipe S dengan kuat tekan sebesar 132,28 kg/cm2, mortar sampel B masuk dalam kategori mortar tipe M dengan kuat tekan sebesar 176,16 kg/cm2 dan mortar sampel C masuk dalam kategori mortar tipe S dengan kuat tekan sebesar 170,68 kg/cm2, secara keseluruhan sampel C memiliki nilai yang lebih tinggi baik secara fisis maupun mekanisnya, mikrostruktur sampel C lebih baik dibandingkan sampel A dan B karena memiliki butiran yang lebih kecil serta terdapat banyak gumpalan yang menyebabkan ukuran pori mengecil sehingga kerapatannya meningkat, penambahan abu ampas tebu meningkatkan jumlah unsur oksigen yang dapat menambah kekuatan mekanis mortar.
Pengaruh Thiourea Sebagai Sumber Doping Sulfur terhadap Sintesis Nanotitania Nabilah Rafidiyah; Posman Manurung; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1815

Abstract

Sulfur–doped TiO2 were prepared by sol gel method using thiourea as sulfur source. The amount of thiourea solutions are 0; 0.5; 1.0; 1.5 and 2 ml, respectively. Sulfur-doped TiO2 was calcinated at 450 °C. Sulfur-doped TiO2 and pure TiO2 were characterized by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM). Photocatalyst tests were carried out undersunlight and UV lamp. Based on XRD characterization, the samples are anatase phase. And particle size was calculated using Scherrer equation and results of  8.94 and 12.98 nm, respectiely for TBT-1.5 and TBT-0.5. TEM characterization showed that particle size of sulfur-doped TiO2 and pure TiO2 are 8.6 and 12.5 nm. Compared to undoped TiO2, sulfur-doped TiO2 has a better photocatalyst activity for degradation of remazol golden yellow under visible light.
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.
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.
Studi Perhitungan Laju Reaksi Neutron Dalam Reaktor SCWR (Supercritical Water Reactor) Model Perangkat (Assembly) Heksagonal Berbahan Bakar Thorium Apriliana Apriliana; Yanti Yulianti; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 6, No 2 (2018): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v6i2.1844

Abstract

The calculation of fission and capture reaction rate with and without filter has been done using REACT of SRAC. In material 1 fission reaction rate with and without filter were increased by increasing percent of U233. The highest fission reaction rate with filter was 5,7194x10-2reaction/cm3sand without filter was 6,1361x10-2 reaction/cm3s. Meanwhile capture reaction rate with and without filter were decreased by increasing percent of U233. The highest capture reaction rate with filter was 2,2156x10-2 reaction/cm3s and without filter was 2,4906x10-2 reaction/cm3s. In material 3, fission and capture reaction rate with and without filter were decreased by increasing percent of U233 in material 1. The highest fission reaction rate with filter was 1,5218x10-2 reaction/cm3s and without filter was 1,6293x10-2reaction/cm3s. The highest capture reaction rate with filter was 2,2156x10-2 reaction/cm3s and without filter was 2,3993x10-2reaction /cm3s. Neutron reaction rate with filter was smaller than neutron reaction rate without filter
Desain Inti (Core) Reaktor SCWR (Super Critical Water-cooled Reactor) Tiga Dimensi (X-Y-Z) Menggunakan Bahan Bakar Thorium Hasil Daur Ulang Sri Harjanti; Yanti Yulianti; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 5, No 2 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i2.1818

Abstract

The research of three-dimensional (X-Y-Z) core design of SCWR reactor using thorium recycled has been done. Neutronic calculations were calculated by SRAC program. Parameters of this research werefuel enrichment, core reactor sizes, core reactorconfigurations, criticality, and power density distribution. The desain of core reactor was 1/8 three-dimensional (X-Y-Z) slab. Fuel reactor was thorium 20 GWd/t burn as inner,and 30 GWd/t burn as outer. Zirconium as cladding,and light water as coolant. Critical condition was achieved at x = 310 cm, y = 170 cm, z = 190 cm and 2,49% of fuel enrichment. Core power reactor was 3.411 MWt, maximum power density was 366,8356 Watt/cc located at x = 34 (170 cm), y = 1 (5 cm), z = 38 (190 cm) and multiplication factor effective (keff) value was 1.0000000.