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Dwi Nanto, Dwi
Department Of Physics Education, Faculty Of Tarbiya And Teaching Science, UIN Syarif Hidayatullah Jakarta, Indonesia
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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Rotating speed and magnetic pole dependency assisted on copper deposition onto aluminum alloy substrate for bacterial eradication application Basori, Basori; Ruliyanta; Ajiriyanto, Maman Kartaman; Kriswarini, Rosika; Hardiyanti, Heri; Rosyidan, Cahaya; Yudanto, Sigit Dwi; Situmorang, Evi Ulina Margaretha; Edbert, Daniel; Nanto, Dwi; Susetyo, Ferry Budhi
Communications in Science and Technology Vol 10 No 1 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.1.2025.1547

Abstract

Copper (Cu) is widely used in many sectors, such as drinking water piping, heat exchangers, and medical equipment. The present research conducted an electrodeposition of Cu over an aluminum (Al) alloy substrate under the influence of various magnetic poles and rotating speeds. In the present study, a number of investigations, including deposition rate, current efficiency, coating thickness, surface morphology and phase, crystallographic orientation, antibacterial activity, electrochemical behavior, and hardness test were conducted. Increasing the rotation speed promoted to enhanced deposition rate and current efficiency for both magnetic poles influence. An increase in the deposition rate from 12.83 to 13.67 µm/h led to the increasing thickness, a change in surface morphology near the spheroidal, becoming a faceted structure. Presenting and rising in the rotation of a magnetic field led to a reduced surface roughness and crystallite size of Cu film for both magnetic poles influence. The Cu film made without spinning magnetic had a characteristic of highest bacterial inhibition zone around 2.50 ±0.56 cm². The CuRN50 sample had the lowest corrosion rate at around 0.055 mmpy, while the CuRS100 sample had the highest hardness value at approximately 80.72 HV for having the lowest crystallite size. Cu coated onto Al alloy could enhance its properties, such as being antimicrobial, being resistant against corrosion and having the hardness value.
Significant Reduction in Lattice Thermal Conductivity of (PbTe)0.95 - (PbS)0.05 Thermoelectric Materials Through Liquid Silicon Quenching Ginting, Dianta; Nurlela, Ai; Nanto, Dwi; Mashadi; Sudiro, Toto; Kristiantoro, Tony; Rhye, Jong-Soo
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1087-1095

Abstract

Thermoelectric materials are game-changers, that have the ability to transform waste heat into electrical energy, making them a potential renewable energy solution to reduce reliance on fossil fuels. The standard metric for evaluating thermoelectric materials is the dimensionless figure of merit, ZT, which is markedly influenced by lattice thermal conductivity (ĸl ). Higher thermal transport through the lattice lowers the ZT value, reducing the material’s efficiency. Therefore, finding ways to decrease ????l is critical for boosting thermoelectric performance. In our research, we explored an innovative approach by applying a quenching technique using liquid silicon to reduce thermal conductivity (ĸT ) due to lattice vibrations. We compared the lattice conductivity (ĸl ) of materials with and without this liquid silicon quenching process. The results were striking: at 300 K, quenching lowers the lattice thermal conductivity by about 40.1 %, and at 800 K, it is still reduced by roughly 24.7%compared with pristine PbTe. Even more impressive, when compared to non-quenched (PbTe)0.95 − (PbS)0.05 alloys, at 300 K, the silicon-quenched sample attains an additional ĸl reduction of roughly 16.1 %, while at 800 K the extra decrease is about 13.0%. These findings highlight that liquid silicon quenching is a highly effective method for lowering ĸl of PbTe thermoelectric materials. This approach paves the way for developing next-generation thermoelectric materials that are more efficient, particularly for eco-friendly waste heat recovery applications. Our work opens new possibilities for sustainable energy innovation.
Cu Film Characteristics Synthesized Using Electrodeposition Technique at Various Currents and Under a Rotating Neodymium Magnet Susetyo, Ferry Budhi; Basori; Mansor, Muhd Ridzuan; Ruliyanta; Yudanto, Sigit Dwi; Rosyidan, Cahaya; Situmorang, Evi Ulina Margareta; Edbert, Daniel; Mutiara, Etty; Yulianto, Tri; Agus Jamaludin; Nanto, Dwi
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1156-1168

Abstract

In the present study, Cu films were made over Al alloy using the electrodeposition technique. Electrodeposition conducted at various currents (80, 100, and 120 mA), with and without influence by a rotating magnetic field (100 rpm of rotation). 0.5 M CuSO4 + 20 mL of H2SO4 was used for electrolyte solutions. The sample before and after electrodeposition was weighed using digital scale to calculate deposition rate and current efficiency. All formed Cu films were characterized using X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), Scanning electron microscopy equipped with Energy dispersive spectroscopy (SEM-EDS), and Potentiostat apparatus. Furthermore, antibacterial activity using Staphylococcus aureus was also investigated. Increasing the current of electrodeposition leads to an increase in deposition rate and current efficiency for both conditions (with and without rotating magnetic field influence). Based on the XRD and ATR-FTIR investigation, Cu was successfully deposited onto Al surface. Currents used for the electrodeposition process between 80-100 mA would result in a faceted structure, while using 120 mA results near to spheroidal. Shifting to higher currents leads to decreases in grain sizes and presenting a rotating magnetic field also enhances the grain size. Current and rotating magnetic influences are not linearly influencing corrosion potential, corrosion rate and antibacterial activity. The sample made using higher current plus influencing with a rotating magnetic field has less corrosion rate and higher area of inhibition at around 0.808 mmpy and 4.01 cm2.
Efektivitas Model Problem-based Learning Berbasis Variasi Bahan Ajar terhadap Hasil Belajar Peserta Didik: Sebuah Meta Analisis Wahyujati, Wardani Indah; Nanto, Dwi; Alatas, Fathiah
Jurnal Pendidikan Matematika dan Sains Vol. 14 No. 1 (2026): February 2026
Publisher : Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpms.v14i1.90986

Abstract

Berbagai penelitian yang mengkaji penggunaan model problem-based learning oleh peserta didik menunjukkan temuan yang bervariasi mengenai tingkat efektivitas tersebut. Studi meta-analisis ini bertujuan untuk mengukur tingkat efektivitas bahan ajar berbasis problem-based learning yang ditinjau secara keseluruhan, jenis bahan ajar, tingkat pendidikan, tingkat wilayah dan aspek hasil belajar. Metode penelitian meta-analisis ini mengikuti pedoman pada kerangka kerja PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analysis), besar pengaruh diukur berdasarkan effect size. Ditemukan 20 artikel yang layak untuk dianalisis. Dengan berbantuan software JASP, hasil penelitian menunjukkan bahwa model problem-based learning paling optimal ketika diintegrasikan dalam bahan ajar berbasis alat peraga khususnya pada jenjang SMA di Pulau Jawa. Model problem-based learning dalam berbagai bentuk bahan ajar terbukti efektif dalam meningkatkan hasil belajar peserta didik yang mencakup aspek kognitif, psikomotor, dan afektif.
Co-Authors Agus Jamaludin Aini Nadhokhotani Herpi Amarulloh, Reza Ruhbani Anggrainy, Rani Az-zahra, Puput Lismanda Azhar, Anugrah Bambang Soegijono Basori Basori Basori Cahaya Rosyidan Daniel Edbert, Daniel Dedi Dedi Etty Mutiara Evi Septiyani Evi Ulina Margaretha Situmorang Fathiah Alatas Ferry Budhi Susetyo Ginting, Dianta Hapitanur, Dinda Heri Hardiyanti Jan Setiawan Kurniawan, Ova Lubi, Ahmad Maman Kartaman Ajiriyanto Mansor, Muhd Ridzuan Mashadi Nanang Sudrajat, Nanang Notonegoro, Hamdan Akbar Nurlaela, Ai Nurlela, Ai Permata Sari, Intan Putri, Ananda Alifia Rahman, Ikhwan Nur Ramlan Rhye, Jong-Soo Rohim, Fahmi Rosika Kriswarini Royhanun Athiyyah Ruliyanta Ruliyanta Saptari, Sitti Ahmiatri Seong-Cho Yu, Seong-Cho Simbolon, Silviana Suhk-Kun Oh, Suhk-Kun Syamsuir, Syamsuir Taryana, Yana Taufiq Al Farizi Tihera, Dinda Tony Kristiantoro, Tony Toto Sudiro Tri Yulianto Umi Pratiwi Wahyujati, Wardani Indah Wen-Zhe Nan, Wen-Zhe Yudanto, Sigit Dwi Yunasfi Yuniarti, Elvan