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All Journal Indonesian Journal of Geography Jurnal Matematika & Sains JFA (Jurnal Fisika dan Aplikasinya) ALCHEMY Jurnal Penelitian Kimia Journal of Engineering and Technological Sciences Advance Sustainable Science, Engineering and Technology (ASSET) International Journal of Natural Science Studies and Development (IJOSS)
Ari Handono Ramelan
Universitas Sebelas Maret
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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Electrical Characteristics and Annealing Effect on Al/n-GaSb Schottky Diode Doped Using DMTe Ari Handono Ramelan; Harjana Harjana; Pepen Arifin; Ewa Goldys
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The electrical properties of Al/n-GaSb Schottky diodes, doped with 1.4 × 1018 cm−3 (tellurium) were examined.  C-V (capacitance-voltage) measurements at 300 K show barrier heights of 0.63 eV, compared to 0.59 eV determined from room temperature I-V (current-voltage)  measurements. The voltage and frequency dependence on the capacitance is due to the ideality factor of the Schottky barrier and due to a high series resistance.  At low frequency the measured capacitance is dominated by the depletion capacitance of the Al/n-GaSb Schottky diode which is bias-dependent and frequency-dependent. The diode shows a strong temperature dependence of ideality factor from approximately 3.6 at room temperature to as high as 6.7 at 140 K.  There may be a small portion of the device nonideality attributable to generation-recombination currents due to deep levels in GaSb. The barrier height decreased from 0.57 eV to 0.35 eV for the sample annealed at 300oC for 1 minute.
Optimasi Parameter Sintesis Nanopartikel TiO2 untuk Dye Sensitized Solar Cell Amalia Puji Winarni; Kusumandari Kusumandari; Ari Handono Ramelan
Jurnal Fisika dan Aplikasinya Vol 10, No 2 (2014)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (269.931 KB) | DOI: 10.12962/j24604682.v10i2.812

Abstract

Penelitian ini bertujuan untuk mengoptimalisasi struktur nano partikel TiO2 sebagai upaya meningkatkan performa Dye Sensitized Solar Cell (DSSC). Sintesis TiO2 menggunakan metode sol-gel dengan variasi waktu proses aging 6 dan 7 hari serta temperatur kalsinasi 550C dan 650C. Dari pengujian XRD diperoleh bahwa sampel TiO2 550C- 7hari memiliki ukuran butir terkecil yaitu 10,30 nm dengan fase anatase. Sedangkan sampel TiO2 650C- 6 hari memiliki ukuran butir terbesar yaitu 15,69 nm dengan struktur bi-fase anatase-rutile. Dari pengujian dengan I-V meter Keithley diperoleh hasil efisiensi terbesar pada sampel TiO2 650C- 7 harisebesar 0,09% dan terkecil pada sampel TiO2 550C- 6 hari sebesar 0,012%.
Aplikasi Geolistrik Resistivitas Konfigurasi Wenner-Schlumberger untuk Pemetaan Sebaran Leachate di Sekitar TPA Putri Cempo Surakarta Chiranjeevi Nugroho; D Darsono; Ari Handono Ramelan
Jurnal Fisika dan Aplikasinya Vol 14, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (692.509 KB) | DOI: 10.12962/j24604682.v14i1.2864

Abstract

Mapping leachate’s distribution using geoelectrical resistivity has been done at Plesungan village, Gondang Rejo, Karanganyar regency. Acquisition using Wenner-Schlumberger configuration with space of the smallest electrode is 15 meters away. This research using resistivitymeter OYO McOHM-EL for current injection and measure the potential difference. Inversion process using Res2dInv software for 2 dimensions model and RockWorks16 software for 3 dimensions model. The location of the research has geology old alluvium with characteristics conglomerate, sandstone, silt and clay. Leachate mapping estimated resistivity value <5.55 ohm meter with the direction away from the final disposal site where the main constituent of reseach sites is clay.
Groundwater Vulnerability Comparison Using DRASTIC and GOD Methods in Surakarta City Koesuma, Sorja; Ramelan, Ari Handono; Sutarno, Doddy
Indonesian Journal of Geography Vol 56, No 1 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.87232

Abstract

Demographic growth, urbanization, economic development, agriculture, and consumption per capita have increased the demand for water resources. The population density of Surakarta affects the city’s ability to fulfil its residents’ clean water requirements. As an urban region, Surakarta may be impacted by development activities that degrade the quality and quantity of groundwater. This growing demand should be balanced against effective management of water source regions. This research aims to investigate groundwater vulnerability in Surakarta City. We employed the DRASTIC and GOD methods and compared both results. These methods used the overlay and indexing approaches using GIS based on field data and secondary data such as drill, rainfall, and topographic data. The results of DRASTIC show three types of vulnerability: high (0.21%; 9.87 ha), moderate (94.22%; 4,355.98 ha), and low (5.56%; 257.25 ha), while GOD method results in high (7.03%; 324.96 ha), moderate (52.90%; 2,445.84 ha), low (38.69%; 1,788.81 ha), and negligible (1.37%; 63.49 ha). Based on both methods, we identified Banjarsari district as a location with high groundwater vulnerability. The correlation coefficient between the two methods is 0.511. This value shows that the correlation criteria are acceptable and comparable. This research can be used by local authorities and policymakers to manage groundwater resources. 
Characteristics of Activated Carbon Panels in Reducing CO, NO2, HC, Pb, and Noise Darmanijati, Maria Roosa Srah; Pranoto, Pranoto; Ramelan, Ari Handono; Inayati, Inayati
Journal of Engineering and Technological Sciences Vol. 56 No. 4 (2024)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.4.9

Abstract

Increasing population growth has resulted in increased vehicle ownership and the need for parking facilities, including in basements. This study aimed to explore the efficacy of palm shell activated carbon panels in reducing CO, NO2, HC, Pb, and noise. The experiment was conducted in a 4 m x 3 m x 2.1 m room using three treatments: without installed activated carbon panels; with 1 cm x 20 cm x 20 cm activated carbon panels; and with 2 cm x 20 cm x 20 cm activated carbon panels. During the measurement, three motorcycles were turned on and kept in idle mode. The concentrations of CO, NO2, HC, ambient Pb, and noise were measured. The results showed that the activated carbon panels were able to reduce CO, NO2, Pb, HC, and noise. The highest performance was obtained for 2-cm thickness of activated carbon panels, with CO, NO2, HC, Pb, and noise decreasing to 824 µg/m3, 8.4 µg/m3, 4.4 µg/m3, 0.2 µg/m3, and 87.44 dB, respectively. Following the adsorption process, the carbon content and pore size of the activated carbon panels had changed from 68.32% to 90.95% and 0.17-3.652 µm to 0.34-5.56 µm respectively for testing with 2-cm thickness panels.
Sustainable Conversion of Mixed Organic Waste into High-Quality Bio-Briquettes through Controlled Carbonization and Densification for Community-Based Energy Systems Rahmat Sabani; Ari Handono Ramelan; Surya Abdul Muthalib; Yuhendra AP
International Journal of Natural Science Studies and Development (IJOSS) Vol. 2 No. 2 (2025): IJOSS
Publisher : PT Inovasi Pratama Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55299/ijoss.v2i2.37

Abstract

The conversion of organic waste into renewable solid fuel represents a promising strategy to simultaneously address waste management challenges and local energy demand. This research evaluates the technical performance, energy characteristics, and environmental implications of producing bio-briquettes from mixed organic waste through controlled carbonization and densification. Mixed organic biomass representative of community waste streams was carbonized using an insulated drum retort under controlled temperature conditions, followed by grinding and densification with a starch-based binder and a low-dose potassium nitrate additive. The resulting bio-briquettes were characterized in terms of physical, mechanical, thermal, and combustion properties. In addition, mass and energy balance analyses and a cradle-to-gate life cycle assessment were conducted to evaluate process efficiency and environmental performance. The results demonstrate that carbonization temperature strongly influences char yield and fuel quality, with optimal performance observed at approximately 400 °C. Under these conditions, the bio-briquettes achieved a high calorific value of approximately 24.3 MJ kg⁻¹ (≈ 5,800 kcal kg⁻¹), high density, adequate compressive strength, and stable combustion behavior. The addition of potassium nitrate significantly improved ignition performance when applied at appropriate concentrations. Life cycle assessment results indicate that bio-briquette production from mixed organic waste results in substantially lower greenhouse gas emissions compared with fossil fuels delivering equivalent energy. Overall, this research confirms that bio-briquettes derived from mixed organic waste represent a technically feasible and environmentally sustainable waste-to-energy solution suitable for decentralized, community-based energy systems.
Performance Evaluation of a Community-Scale Fiberglass Anaerobic Digester for Biogas and Nutrient Recovery Rahmat Sabani; Ari Handono Ramelan; Pranoto Pranoto; Mohammad Masykuri
Advance Sustainable Science Engineering and Technology Vol. 8 No. 3 (2026): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i3.2422

Abstract

The management of organic waste using an anaerobic reactor offers the potential for renewable energy production and nutrient recovery. This study evaluates the performance of a 3,000 L fiberglass anaerobic reactor designed to treat a mixture of kitchen waste, cow manure, and water in a 1:1:1 ratio. The process was conducted under mesophilic conditions (30–38 °C) over a 40-day batch cycle. The reactor produced a total of 63.75 m³ of biogas with an average methane content of 59.3%, equivalent to 0.193 m³ CH₄/kg VS. Additionally, the system produces approximately 2,700 kg/month of liquid effluent and 900 kg/month of stabilized solids. These results demonstrate the efficiency of substrate bioconversion and the potential for utilizing residues as organic fertilizer. This study emphasizes the technical feasibility of using a community-scale fiberglass reactor for organic waste treatment with measurable performance parameters.
Pengaruh Bentonit terhadap Pembentukan Fasa Polimorf dan Sifat Termal Membran Hibrida Poliviniliden Fluorida/Bentonit Pramono, Edi; Mustofa, Rosid Eka; Saputra, Ozi Adi; Nugroho, Yulianto Adi; Wahyunigrum, Deana; Radiman, Cynthia Linaya; Wahyuningsih, Sayekti; Saraswati, Teguh Endah; Rahardjo, Sentot Budi; Lestari, Witri Wahyu; Widjonarko, Dian Maruto; Ramelan, Ari Handono
ALCHEMY Jurnal Penelitian Kimia Vol 17, No 2 (2021): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.17.2.46136.177-184

Abstract

Kajian struktur dan degradasi termal pada membran hibrida poliviniliden fluorida (PVDF)/lempung bentonit (BNT) telah dilakukan. Penelitian ini bertujuan mengetahui pengaruh penambahan BNT terhadap pembentukan fasa PVDF dan sifat termalnya. Membran hibrida PVDF/lempung BNT dibuat dengan metode inversi fasa. Membran yang dihasilkan dikarakterisasi dengan attenuated total reflectance fourier transform infrared (ATR-FTIR), x-ray diffraction (XRD), dan differential scanning calorimetry (DSC). Hasil penelitian menunjukkan membran PVDF/BNT memiliki struktur polimorf PVDF fasa α dan β yang terkonfirmasi dari data FTIR dan XRD. Data DSC menunjukkan penurunan nilai titik leleh (Tm) dengan penambahan BNT, dan dengan rentang suhu pelelehan yang lebih kecil. Kristalisasi PVDF terjadi secara isothermal dan adanya BNT menghasilkan titik kristalisasi (Tc) pada suhu yang lebih tinggi dibandingkan membran PVDF murni. Analisis termal dengan DSC memberikan informasi komprehensif pelelehan dan kristalisasi dari polimorf PVDF pada matriks membran.Effect of Bentonite toward Polymorph Phase Formation and Thermal Properties of Polyvinylidene Fluoride/Bentonite Hybrid Membranes. The study of the structure and thermal properties of PVDF/bentonite (BNT) hybrid membranes has been carried out. This study aims to determine the effect of BNT addition on the phase formation and thermal properties of the PVDF. In this study, PVDF/BNT hybrid membranes were prepared through the phase inversion method. The resulting membrane was characterized by Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), x-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results showed that the PVDF/BNT membrane has a PVDF polymorph structure with α and β phases confirmed by FTIR and XRD data. The DSC data showed that the addition of BNT decrease of the melting point (Tm) and with a smaller melting temperature range. PVDF polymorph crystallization occurs isothermally and the presence of BNT produces a crystallization point (Tc) at a higher temperature than pristine PVDF membrane. Thermal analysis with DSC provides comprehensive information on melting and crystallization of PVDF polymorphs in the membrane matrix.
Co-Authors Agus Supriyanto Amalia Puji Winarni Chiranjeevi Nugroho Cynthia Linaya Radiman D Darsono Darmanijati, Maria Roosa Srah Dian Maruto Widjonarko Diani Galih Saputri Doddy Sutarno Edi Pramono Eko Sulistiyono, Eko Elsa Ayu Adhitya Ewa Goldys Febrina Ramadhani Florentinus Firdiyono Hari Hidayatullah, Hari Harjana Harjana Inayati Inayati Koesuma, Sorja Kusumandari, Kusumandari Lestari, Witri Wahyu Mohammad Masykuri Mohd Khairul Bin Ahmad Nugroho, Yulianto Adi Ozi Adi Saputra, Ozi Adi Pepen Arifin Pranoto Pranoto Pranoto Pranoto Rahmat Sabani Rahmat Sabani Rosid Eka Mustofa, Rosid Eka Sayekti Wahyuningsih Sentot Budi Rahardjo Suharyana S Surya Abdul Muthalib Teguh Endah Saraswati Wahyunigrum, Deana Yuhendra AP