A5045082622- Magnetic Properties and Synthesis of Ferrites
- Agricultural and Environmental Management
- Plant Growth and Agriculture Techniques
- Electromagnetic wave absorption materials
- Multiferroics and related materials
- Natural Products and Applications
- Aquatic life and conservation
- Marine and Coastal Ecosystems
- Forest Ecology and Conservation
- Agriculture and Agroindustry Studies
- Material Selection and Properties
- Nanotechnology research and applications
- Coastal Management and Development
- Plant Pathogens and Fungal Diseases
- Iron oxide chemistry and applications
- Minerals Flotation and Separation Techniques
- Environmental Engineering and Cultural Studies
- Plant Parasitism and Resistance
- Magneto-Optical Properties and Applications
- Community-based Tourism Development and Sustainability
- Induction Heating and Inverter Technology
- Plant and Biological Electrophysiology Studies
- Advanced Materials and Semiconductor Technologies
- Advancements in Battery Materials
- Carbon Nanotubes in Composites
University of North Sumatra
2009-2024
Indonesian Institute of Sciences
2024
Material (Belgium)
2024
Universitas Pamulang
2024
National Research and Innovation Agency
2022-2023
Nuclear Energy Agency
2021
National Nuclear Energy Agency of Indonesia
2011-2020
Ministry of Science and Technology Thailand
2015-2018
Badan Pengkajian dan Penerapan Teknologi
2017-2018
Nilai University
2011
Kepiting bakau (Scylla serrata) merupakan salah satu spesies kunci dalam ekosistem mangrove yang memegang peranan sangat penting. Hutan ada di Kelurahan Belawan Sicanang sudah banyak mengalami konversi lahan seperti tambak dan pemukiman. Kondisi ini menyebabkan terjadinya penurunan kualitas habitat populasi untuk sumberdaya kepiting akibat kerusakan daerah asuhan mencari makan biota ini. Penelitian bertujuan mengetahui kondisi ekologi mangrove, kelimpahan serrata), pertumbuhan Mangrove...
We discuss the structure properties of Ba0.6Sr0.4Fe10-xCoxMnTiO19(BSFCMTO) for x = 0.5, 1.0, and 1.5 that influence its magnetic as a microwave absorber. A solid-state reaction method using high-energy milling was used to synthesize hexaferrite. There were no structural changes when Co2+ ion substituted Fe3+ ion; structures all samples hexagonal space group P63/mmc. The surface morphology had heterogeneous particles with size 300 600 nm. tended decrease an increasing number substitutions....
In the contrary to other common AFe 2 O 4 ferrites, Barium Monoferrite (BaFe ) have a bit more complex structure which exhibits orthorhombic structure. This permits substitute Ba 2+ with another divalent ion metals such as Strontium (Sr improve magnetic and microwave absorbing property. this study, in form of (1-x) Sr (x) Fe (0.0 x 0.5) has been successfully fabricated using high energy milling technique. Fine nanoparticle powder was characterized by X-ray diffractometer, Raman...
Mangrove menghasilkan serasah yang akan mengalami proses dekomposisi kemudian dimanfaatkan sebagai sumber hara bagi tanaman dan juga merupakan makanan ikan serta invertebrata penting. Tujuan dari penelitian ini adalah untuk mengukur daun R. apiculata mengetahui kandungan unsur karbon (C), nitrogen (N) fosfor (P) pada Rhizophora dilepas selama dekomposisi. Penelitian dilakukan bulan Februari hingga Mei 2017 di Desa Bagan Asahan Kecamatan Tanjungbalai Kabupaten Provinsi Sumatera Utara....
Nickel ferrite doped by neodymium in the form of (Ni(1-x)NdxFe2O4) with (x = 0.0 ; 0.2 and 0.4) have been synthesized using solid state reaction method milling technique from NiO, Nd2O3 Fe2O3 powder. The mixture those compound materials was milled High Energy Milling (HEM) machine for 10 hours then sintered at 1000 °C 5 h. X-ray diffraction patterns showed that a single phase spinel has formed all compositions. result morphological observation Scanning Electron Microscope (SEM) exhibited...
A research to study the microwave absorption properties of manganese ferrite in X-band range have been conducted by using high energy milling technique. The synthesis (Mn1+xFe2-xO4) was performed solid state reaction method with material composition (x)MnO : (2-x) Fe2O3 (x = 0.25; 0.50; 0.75 and 1.0) according molar ratio. This powder mixture being milled for 10 hours then sintered at 1200 °C temperature 3 hours. Material characterization done FTIR spectroscopy (Fourier Transform Infra Red...
<strong>Limnological Status of Lake Siombak, Medan, North Sumatra.</strong> Siombak is located in the coastal area Medan city, making its waters influenced by tides. The lake serves as a water catchment, flood control, fishing area, and tourist destination. Various activities have led to changes environmental quality lake. To maintain sustainability lake, efforts are needed for proper management. management should begin with good understanding nature characteristics waters. This...
Abstrak. Ikan gelodok atau Mudskipper merupakan ikan yang hidup di daerah pasang-surut. ini mampu berjalan atas lumpur, bahkan memanjat akar-akar mangrove. Informasi tentang kajian mengenai Indonesia masih sedikit. Untuk itu diperlukan informasi lebih lanjut jenis-jenis dan tipe habitat paling sering ditemukan gelodok. Penelitian dilaksanakan pada bulan Maret 2014 sampai dengan April 2014. Pengambilan contoh 3 yaitu, pantai, mangrove sungai/saluran. Identifikasi jenis mengacu Kottelat et...
CoNd x Fe (2− ) O 4 ( = 0.0–0.05) spinel ferrites are successfully synthesized by mechanical milling using solid‐state reaction. The effects of Nd 3+ ions on structural, microstructure, and magnetic microwave‐absorbing properties samples analyzed. X‐ray diffraction pattern shows a single‐phase cobalt ferrite for all compositions. Refinement the structure that an increase in concentration leads to parameter volume unit cell decrease. Lattice strain arises crystal, limiting crystallite growth...
The aims of the research was to examine lenght weight relationships, growth pattern and condition factor mudskipper (Family: Gobiidae) at mangrove ecosystem. conducted for two months from March April 2016 ecosystem in Sembilan Island village. result showed that there are three species found study area, namely Periophthalmus chrysospilos, gracilis, Boleophthalmus boddarti. with a value b 3, indicate allometrik negative between 1-2.Penelitian ini bertujuan untuk menganalisis hubungan panjang...
Telah dilakukan sintesis bahan absorber gelombang mikro Ni(1,5-x)LaxFe1,5O4 dengan (x = 0,0; 0,5 dan 1,0) menggunakan metode sol-gel. Bahan disintesis dari campuran serbuk Ni(NO3)2, Fe(NO3)3 La(NO3)3 dalam perbandingan mol masing-masing sol-gel kemudian disinter pada suhu 1200 C selama 3 jam. Identifikasi fasa X-Ray Diffractometer (XRD) menunjukkan bahwa penambahan kandungan ion La3+ terbentuk 2 yaitu NiFe2O4 LaFeO3. Pengamatan morfologi Scanning Electron Microscope (SEM)menunjukkan...
Danau Pondok Lapan (DPL) adalah sebuah danau buatan yang terdapat di Kabupaten Langkat. ini berfungsi sebagai sumber air, irigasi, resapan air tanah bagi masyarakat sekitar, pengendali banjir, dan kegiatan pemancingan ikan. Sampai saat data-data tentang tersebut sangatlah terbatas. Data-data terkait sumberdaya sangat diperlukan untuk pengelolaan lebih tepat. Diantara beberapa data dimaksud organisme penyusun danau. Penelitian bertujuan mempelajari kondisi biologis DPL dengan melihat...
Abstract This paper discusses the impact of Al 3+ ion substitution on Fe ions in hexaferrite compound Ba 0.6 Sr 0.4 12−x x O 19 reflection loss value and bandwidth absorbing microwaves. Hexaferrite (x = 0.25, 0.50, 0.75, 1.00) was synthesized by high-energy ball milling (HEBM) for forty hours, followed sintering at 1000 °C air five hours. Then, crystal structure, formed phase, surface morphology, magnetization, ability to absorb microwaves X-band region were successively characterized. All...
Telah dilakukan analisis struktur mikro dan sifat magnet bahan penyerap gelombang Ni(0,5-x)NdxFe2,5O4 hasil sintesis dengan metode kopresipitasi. Serbuk (x = 0,0; 0,2 0,4) disintesis mencampurkan serbuk NiCl2, NdCl3 danFeCl3 sesuai perbandingan molnya masing-masing. Identifikasi fasa XRD (X-ray diffraction) menunjukkan telah terbentuknya komposit  munculnya NiFe2O4, NdFeO3 Fe2O3. Pengamatan morfologi SEM (Scanning Electron Microscope) butiran yang tidak homogen ukuran antara 100 nm – 200...
The synthesis and characterization of composition SrFe12-(x+y)MnxTiyO19 (x = y x ≠ y) compound by using solid state reaction have been performed. raw materials were SrCO3, Fe2O3, MnCO3, TiO2. mixed powder was compacted at 5000 psi into pellets sintered 1050°C in the air atmosphere pressure for 15 hours furnace cooling. refinement results x-ray diffraction pattern show that doping a single phase while multi phase. We concluded effect substitution upon magnetic properties revealed total...
ANALISIS DIFRAKSI SINAR-X DAN KARAKTERISASI ZnxFe(3-x)O4SEBAGAI PENYERAP GELOMBANG MIKRO OLEH PADA PERALATAN TELEKOMUNIKASI. Telah dilakukan analisis dan karakterisasi ZnxFe(3-x)O4 sebagai penyerap gelombang mikro pada peralatan telekomunikasi.. Sistem (dengan x = 0,50; 0,75; 1,0 1,25) disintesis dengan mencampurkan serbuk Zn(NO3)2 Fe(NO3)3 sesuai perbandingan molnya metode sol-gel kemudian disintering suhu 1000 ºC selama 5 jam. Hasil refinement dari pola difraksi sinar-X menunjukkan bahwa...
ANALYSIS OF CRYSTAL STRUCTURE AND FUNCTIONAL GROUPS NiFe 2 O4 USING SOL GEL METHOD . A synthesis and characterization with sol gel method have been conducted. Fe2(NO 3 )3.9H O powder mixed Ni(N )2 was dissolved in 50 ml of polyethylene glycol at room temperature, then heated a temperature approximately 60 °C for 1 hour while stirring to form wet gel. The dried an oven 120 5 hours grinded NiFe2O4. NiFe2O4 furnace variation 400°C, 600 °C, 800 1000 respectively. X-Ray Diffraction (XRD) pattern...