Article Per Year (5 Year)
p-Index From 2020 - 2025
3.512
P-Index
This Author published in this journals
All Journal Jurnal Ilmu Dasar Jurnal Sains dan Teknologi JFA (Jurnal Fisika dan Aplikasinya) Science and Technology Indonesia SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Kreativitas PKM JIEMS (Journal of Industrial Engineering and Management Systems) Jurnal Teori dan Aplikasi Fisika Piston: Journal of Technical Engineering Jurnal Fisika Indonesia Jurnal Pengabdian Kepada Masyarakat (JPKM) Tabikpun Journal of Energy, Material, and Instrumentation Technology RENATA Jurnal Pengabdian Masyarakat Kita Semua JURNAL REKAYASA KIMIA & LINGKUNGAN
Pulung Karo-Karo
Universitas Lampung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

Published : 48 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 48 Documents
Search

 1   2   3   4   5 
Pengaruh Penambahan Alumina (Al2O3) 0, 10, dan 15 wt% terhadap Karakteristik Konduktivitas Listrik dan Mikrostruktur Cordierite (2MgO.2Al2O3.5SiO2) Berbasis Silika Sekam Padi Oktivianty, Shella Windi; Sembiring, Simon; Simanjuntak, Wasinton; Karo-Karo, Pulung
Jurnal Teori dan Aplikasi Fisika Vol 4, No 2 (2016): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v4i2.1339

Abstract

Penelitian ini dilakukan untuk mengetahui pengaruh penambahan alumina terhadap karakteristik fisis, mikrostruktur, dan konduktivitas listrik cordierite. Silika diperoleh dari sekam padi melalui metode sol-gel sedangkan alumina dan magnesium berasal dari MERCK. Cordierite disintesis melalui metode padatan dengan suhu sintering 1200oC. Hasil Pengukuran menunjukkan bahwa penambahan alumina mengurangi densitas, menambah porositas, dan menurunkan nilai konduktivitas listrik sampel. Karakterisasi dengan Scanning Electron Microscopy (SEM) menunjukkan adanya bentuk yang tidak beraturan, pori yang semakin banyak dan aglomerasi yang semakin besar pada sampel dengan penambahan alumina.
Analisis dan Karakterisasi Kandungan Silika (SiO2) sebagai Hasil Ekstraksi Batu Apung (Pumice) Trianasari, Trianasari; Manurung, Posman; Karo Karo, Pulung
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.v5i2.1814

Abstract

The study of silica from pumice was done by extraction method using NaOH, H2SO4, and HCl. Powder of pumice before extraction was calcined at 450oC for 4 hours. The extraction powder was calcined at 800 °C for 3 hours. The powder before and after the extraction were characterized by XRD and SEM-EDS. Sample also characterized by DTA-TGA analysis before extraction and after extraction was analyzed by TEM. XRD pattern powder of pumice dominated by amorphous silica. The results have been confirmed with SEM-EDS showing that the silica content has the highest percentage, ie 65.88% for the sample before extraction and 78.95% for the sample after extraction. From the TEM observation it shows spherical particles, with particle size of 5.8 ± 0.2 nm. DTA-TGA analysis for pumice powder shows the occurrence of endotherm and exothermic events accompanied by mass shrinkage along with warming temperature rise.
Pengaruh Lama Pemanasan, Pendinginan secara Cepat, dan Tempering 600 oC terhadap Sifat Ketangguhan pada Baja Pegas Daun AISI No. 9260 Pulung Karo Karo, Desti Nurjayanti, Ediman Ginting,
Jurnal Teori dan Aplikasi Fisika Vol 1, No 2 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.954

Abstract

It has been related the effect of holding time heating, quenching, and tempering of influence in the leaf spring steel AISI No. 9260. The research was conducted to determine the impact value of leaf springs steel that are usually used on motor vehicles based on the heating, quenching with oil, and tempering to produce data on the impact of leaf springs steel. Heating process is carried out at a temperature 780 °C with holding time of 40 and 60 minutes the next rapidly cold using oil. The process of heating changes the steel phase to hardly martensite and followed by tempering at a temperature of 600 °C with a holding time of 40 minutes which is made the steel phase transformed into tempered martensite and ferrite, so that the steel hardness decreased and increased impact values. Before doing the heating, the impact values of steel is 0.23 J/mm2 smaller than the steel has been given the heating, quenching, and tempering that is equal to 0.803 J/mm2. Keyword: Leaf springs steel, Tempering, Quenching.
Pengaruh Suhu Tinggi terhadap Karakteristik Keramik Cordierite Berbasis Silika Sekam Padi Sembiring, Simon; Manurung, Posman; Karo-Karo, Pulung
Jurnal Fisika dan Aplikasinya Vol 5, No 1 (2009)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (95.746 KB) | DOI: 10.12962/j24604682.v5i1.933

Abstract

This study was carried out to investigate the effect of high temperature on the functional groups, microstructure and physical characteristics of cordierite ceramics obtained from an aqueous solution of magnesium nitrate hydrate ((Mg(NO3)2.6.12H2O)), aluminium nitrate hydrate (Al(NO3)2.9.15H2O) and silica sols extracted from rice husk. The samples were sintered at temperature of 1000â—¦C, 1200â—¦C and 1400â—¦C. Functional groups and microstructural characteristics of cordierite ceramics were examined by FTIR and SEM, respectivelly. FTIR study shows that the absence of the vibration bands of Na-OH, Si-OH, C-O, Si-O-Si on the samples. However, the formation of cordierite structure was dominated on this high temperature. Microstructure results confirmed the presence of irregular morphology of the solid and compact phases. In addition, the densities, shrinkage andhardness of cordierite increase significantly with increasing temperature, but porosity decreases with increasingtemperature.
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 : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i2.956

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.
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.
Kajian Konduktivitas Listrik Zeolit Pada Perlakuan Termal 150°C, 250°C, 350 °C Dan Potensinya Sebagai Elektrode Superkapasitor Alfi Hamidah; Pulung Karo Karo; Bambang Joko Suroto
Jurnal Teori dan Aplikasi Fisika Vol 5, No 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.1361

Abstract

Zeolite based silica rice husk has been prepared and analyzed with thermal treatment 150 °C, 250 °C, and 350 °C. This research was conducted to study the effect of thermal treatment with a variety temperature to particle size and electrical conductivity of zeolite. In thermal treatment at 350 °C was obtained the smallest particle size, amounted to15,396 μm, meanwhile the highest electrical conductivity values was obtained at 250 °C,amounted to 1,5540x10-4 S/cm. This is caused by the phase structure changes and particle agglomeration. Based on the result of electrical conductivity values, zeolite is included in semiconductor and has a potential as a supercapacitor electrode.
Pengaruh Heat Treatment Dengan Variasi Media Quenching Air Garam dan Oli Terhadap Struktur Mikro dan Nilai Kekerasan Baja Pegas Daun AISI 6135 Anggun Mersilia; Pulung Karo Karo; Yayat Iman Supriyatna
Jurnal Teori dan Aplikasi Fisika Vol 4, No 2 (2016): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v4i2.1334

Abstract

Telah dilakukan penelitian mengenai pengaruh heat treatment dengan variasi media quenching air garam dan oli terhadap struktur mikro dan nilai kekerasan baja pegas daun AISI 6135. Proses pemanasan dilakukan pada temperatur 800℃ selama 60 menit, lalu proses quenching dengan variasi media pendingin 100% air garam dan campuran 50% air garam : 50% oli, dan tempering pada temperatur 600℃ selama 45 menit. Hasil uji komposisi kimia menunjukkan baja pegas daun termasuk baja karbon sedang (C = 0,343%) dan chromium-vanadium steel (AISI 6135).Hasil uji kekerasan raw material sebesar 42,27 HRc, pada media quenching 100% air garam sebesar 34,27% HRc. Sementara pada media quenching campuran 50% air garam : 50% oli sebesar 38,27 HRc. Hasil struktur mikro pada sampel raw material menunjukkan fasa ferit dan perlit. Sementara Quench-temper campuran 50% air garam : 50% oli terbentuk fasa ferit, austenit sisa dan martensit temper yang lebih rapat dan menyebar merata dibandingkan100% air garam.
Pengaruh Variasi Konsentrasi NaOH Optimum pada Pembuatan Nanosilika dari Batu Apung Zahra Maria Ulfa; Posman Manurung; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2262

Abstract

Kemajuan tekhnologi di bidang nanomaterial membuat beberapa industri pengolahan silika sudah mulai memproduksi nanopartikel silika sehingga pencarian sumber-sumber baru yang mampu memproduksi silika telah banyak diminati. Salah satu sumber daya mineral yang berpotensi untuk dikembangkan adalah silika (SiO2). Batu apung adalah batu vulkanik berpori amorf yang terdiri dari silika. Pada penelitian ini dibuat nanosilika dari batu apung dengan diekstraksi menggunakan larutan NaOH pada variasi konsentrasi 2,5 M, 2,7 M, 2,9 M, 3,1 M dan 3,3 M untuk mengamati pengaruhnya pada jumlah dan komposisi kimia serbuk nanosilika yang dihasilkan, fasa nanosilika yang terbentuk dan ukuran  nanosilika. Ekstraksi silika ini dibuat dengan metode sol-gel menggunakan refluks. Pembentukan gel silika dilakukan menggunakan H2SO4 5M dan proses pemurnian serbuk silika menggunakan HCl 1,25 M kemudian dikalsinasi pada suhu 800oC selama 6 jam dan dikarakterisasi dengan XRF, XRD, TEM dan FTIR. Hasil yang diperoleh pada penelitian ini menunjukkan pengaruh konsentrasi NaOH pada jumlah serbuk yang dihasilkan yaitu meningkat seiring peningkatan konsentrasi NaOH yang digunakan. Komposisi SiO2 dari semua sampel menunjukkan hasil optimum pada sampel dengan konsentrasi NaOH 2,7 M yaitu 97,1% yang juga memiliki ikatan SiO-Si dan Si-OH, meiliki fasa amorf dan rata-rata ukuran partikel adalah (11,9±2,6) nm.
Co-Authors Abdurrahman, Ahmad Faruq Achmad Shofi Agus Riyanto Ahmad Saiful Munir Alfi Hamidah Amilia Rasitiani Anggun Mersilia Anton Sapto Handoko Aprilia, Ayu Apriliana Apriliana Aris Pratama Bambang Joko Suroto Birawidha, David Candra Candra Kurniawan Delfi Oktavia Amrani Dwi Asmi Ediman Ginting Ediman Ginting Ediman Ginting Ediman Ginting Ediman Ginting Ediman Ginting Suka Ediman Ginting Suka Eko Arief Setiadi Elsa Mega Puspitaratu Fajar Nurjaman Fitri Fitri Herullah Herullah Indah Pratiwi Indriyawati, Agapetalia Intan Wandira Iqbal Firdaus Ismi Nurhayati Isnugroho, Kusno Iwan M Ridwan Jayanti Pusvitasari Jennifer Kapriati Pakpahan Junaidi Junaidi Junaidi Junaidi Karlina Rahmah Malik, Daffa Abdul Mareli Telaumbanua Marjunus, Roniyus Muhammad Amin Muhammad Amin Muhammad Nursani Muhammad Rizki Muhammad Yunus Nabilah Rafidiyah Nia Diana Nindia Agustin Oktaviando, Fany Oktivianty, Shella Windi Parmadean Subayang Pauzi, Gurum Ahmad Perdamean Sebayang Posman Manurung R Rosalina Rianita Nurhasanah Rio Orlando Pratama Riski Wulan Sari Risky Putra Ramadhan Rizky Damayanti Rudy T M Situmeang S Suprihatin Sembiring, Simon Simon Sembiring Simon Sembiring Simon Sembiring Simon Sembiring Slamet Sumardi, Slamet Sri Harjanti Suci Pangestuti Sudibyo Sudibyo Suprihatin Suprihatin Suprihatin Suprihatin Suprihatin Suprihatin Supriyanto, Amir Sutopo Hadi Syafriadi Syafriadi Syafriadi Syafriadi Syah, Aminudin Telaumbanua, Syukur Trianasari, Trianasari Vega Rahmawati Ar Wahyuningsih Wahyuningsih Wasinton Simanjuntak Wini Rahmawati Wisnu Ari Adi Yanti Yulianti Yanti Yulianti Yanti Yulianti Yayat Iman Supriyatna Yayat Iman Supriyatna Yohanes W.M Purba Yusup Hendronursito, Yusup Zahra Maria Ulfa