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Pulung Karo-Karo
Universitas Lampung
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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.
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 Luas Permukaan Spesifik terhadap Kapasitansi Spesifik Elektrode Zeolit Akibat Variasi Suhu Kalsinasi R Rosalina; S Suprihatin; Pulung Karo Karo
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.v5i1.1357

Abstract

The effect of specific surface area to the specific capacitance of electrode zeolite with variation of calcintion temperatures. This study describes the potential of zeolite as a supercapacitor electrode which aims to determine the effect of surface area on the specific capacitance of the zeolite. Zeolites was synthesized from a mixture of silica based rice husk and alumina using sol gel methode and was calcined at 150, 250, 350, 450, 550, and 650oC. The XRD result showed already formed alumina and silica phases for each calcinations temperature and the temperature of 350oC has formed gmelinite phase which marks have been formed zeolite. The specific capacitance increase in the specific surface area at 90.69 - 150.01 m2/g, and occurred saturation of specific capacitance at a specific surface area of 150.01 m2/g. The highest of specific capacitance is at specific surface area of 150.01 m2/g is equal to 8.13x10-3 F/g obtained from zeolites with calcination temperature of 650oC. Based on this value, the zeolite can be used as a supercapacitor electrode 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
Pembuatan dan Karakterisasi Komposit Batako Ringan dengan Campuran Sekam Padi Sebagai Bahan Pengisi untuk Kontruksi Bangunan Redam Suara Aris Pratama; Pulung Karo Karo; Simon Sembiring
Jurnal Teori dan Aplikasi Fisika Vol 2, No 1 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i1.1257

Abstract

Telah dilakukan penelitian dengan tujuan untuk mengetahui pengaruh sekam padi terhadap kuat tekan dan penyerapan redam suara pada batako sekam padi tersebut. Metode penelitian yang digunakan adalah metode padatan. Sampel sebanyak 21 batako berbentuk silinder dengan diameter 5cm dan tinggi 4cm. Variasi Semen 10%, 20% dan 30% dengan persentase volume. Bahan pengisinya berupa pasir 80-10% dan sekam 10-80% dengan jumlah total 100%. Karakterisasi yang dilakukan berupa uji fisis yaitu densitas, porositas dan uji mekanis yaitu uji kuat tekan, uji redam. Hasil uji karakterisasi densitassebesar 1.13-1.77 gr/cm3. Densitas yang paling besar adalah sampel S30SP10 yaitu 1.77 gr/cm3. Nilai porositas antara 6.39-46.55%. Uji kuat tekan antara 0.43-12.84Mpa. Kuat tekan yang paling besar adalah sampel S30SP10 karena kandungan semen yang besar sehingga memperkuat beton ringan tersebut. Uji redam suara tertinggi pada sampel S30SP60 dengan penyerapan sebesar 0.44. Selanjutnya uji konduktivitas termal dilakukan pada sampel S10SP80, S30SP40, S30SP50 dengan data hasil yaitu 0.81, 0.89, 1.09 W/moK.
Pengaruh Variasi Volume Terak (Slag) dan Abu Sekam Padi Terhadap Sifat Fisis dan Mekanis Komposit Semen-Terak (Slag)-Abu Sekam Padi Iwan M Ridwan; Pulung Karo Karo; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol 2, No 2 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i2.1273

Abstract

Telah dilakukan pembuatan komposit konstruksi dari agregat limbah terak dan abu sekam padi. Perbandingan antara semen : terak (slag) : abu sekam padi yang dilakukan yaitu 1:2:3, 1:2:4, 1:2:5, 1:3:3, 1:3:4 dan 1:3:5. Pengujian dilakukan ketika sampel telah berumur 28 hari. Berdasarkan hasil pengujian, sampel 1:2:3 memiliki karakteristik yang lebih baik dibandingkan sampel lain. Sampel 1:2:3 memiliki bulk density (kerapatan) 0,950 gram/cm3, porositas 21,81%, nilai kuat tekan 55,17 kg/cm2 dan sifat penyerapan suara yang efisien pada frekuensi di bawah 1000 Hz. Berdasarkan uji kuat tekan sampel yang dihasilkan memiliki mutu yang setara dengan batako tipe III dan IV berdasarkan SNI 03-0348-1989 Selain itu berdasarkan uji kuat redam suara sampel yang dihasilakn memenuhi syarat minimum sebagai bahan peredam (0,15) sesuai dengan ISO 11654.
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)
Komposisi Kimia, Struktur Mikro, Holding Time dan Sifat Ketangguhan Baja Karbon Medium pada Suhu 780 0C Fitri Fitri; Ediman Ginting; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 1, No 1 (2013): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v1i1.481

Abstract

Telah dilakukan proses laku panas (heat treatment) dengan menggunakan bahan baja pegas daun. Tahapan awal preparasi sampel sebagai berikut: baja pegas daun dilakukan pemanasan awal pada suhu 600 0C selama 30 menit, selanjutnya dilakukan pemanasan sehingga suhu austenisasi pada suhu 780 0C dengan waktu tahan masing-masing 20 dan 40 menit setelah itu di quenching dengan menggunakan air. Adapun uji yang dilakukan adalah uji ketangguhan dengan metode charpy, uji komposisi kimia dan struktur mikro. Dari hasil uji komposisi kimia menunjukkan bahwa baja pegas daun tergolong ke dalam baja karbon medium (C = 0,58%). Pada uji ketangguhan (impact) hasil austenisasi diperoleh nilai ketangguhan tertinggi (paling liat) pada suhu 780 0C dengan waktu tahan 40 menit sebesar 0,07 J/mm2 hal ini disebabkan atom-atom karbon pada austenit yang berasal dari perlit masih belum banyak yang berdifusi ke fasa austenit yang berasal dari ferit. Untuk struktur mikro hasil yang paling baik juga diperoleh pada suhu 780 0C dengan waktu tahan 20 menit menunjukkan ukuran dan struktur butir yang halus dan hampir seluruhnya menjadi martensit. Kata Kunci: Baja karbon medium, heat treatment, metode charpy, impact.
Pengaruh Batu Apung Sebagai Bahan Abrasif Terhadap Karakteristik Komposit Rianita Nurhasanah; Pulung Karo Karo; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol 2, No 1 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i1.1263

Abstract

Telah dilakukan penelitian pembuatan komposit berbasis batu apung, pasir sungai, dan resin epoksi. Dari hasil pengukurandiperoleh hasil terbaik pada komposisi 30 gram batu apung, 70 gram pasir sungai, dan 25 gram resin epoksi(30:70) dengan densitas 1,989 g/cm3, porositas 2,243%, dan kuat tekan 23,892 MPa.Hal ini menunjukkan penambahan batu apung sangat berpengaruh terhadap nilai densitas,porositas, dan kuat tekan dari material yang dihasilkan. Semakin meningkat penambahan batu apung, maka nilai densitas cenderung menurun, sedangkan nilai porositasnya semakin meningkat.
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.
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