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Banana Peel-Derived Activated Carbon/MnO₂ Composites for Supercapacitor Electrode Applications
Herwanti, Katarina
; Saptono Nugrohadi
; Muhammad Taufiq Anwar
; Stanislaus Christo Petra Nugraha
; Dail Umamil Asri
; Noening Andrijati
Banana peel waste is an abundant agricultural by-product with high carbon content but remains largely underutilized. This study presents a preliminary investigation into the conversion of banana peel waste into activated carbon and its integration with manganese dioxide (MnO₂) to produce biomass-derived composite electrodes for supercapacitor applications. Activated carbon was prepared by carbonization followed by chemical activation using 30 wt% H₃PO₄, while MnO₂–carbon composites were synthesi...
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Loading-Dependent Physicochemical Characteristics of LiMn2O4 Composites with Plasma-Modified and Ammonia-Functionalized Rice Husk Carbon
Harianingsih, Harianingsih
; Deni Fajar Fitriyana
; Januar Parlaungan Siregar
; Agung Budiwirawan
; Ari Dwi Nur Indriawan
; Suryo Wiroyudho Wibowo
; Rizky Ilham Fadzillah
; Nabila Khoirunisa
This study investigates LiMn2O4 composites incorporated with nitrogen-functionalized rice husk-derived carbon as a sustainable secondary phase for cathode material development. Rice husk carbon was prepared through carbonization, acid-assisted activation, plasma treatment, and ammonia functionalization, then mechanically blended with LiMn2O4 at 2, 3, and 4 wt.% to obtain LMO-NC2, LMO-NC3, and LMO-NC4, respectively. FTIR analysis showed absorption bands at approximately 3390, 1625, 1400, 1008, 83...
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Pengembangan Digital Pressure Meter Berbasis IoT untuk Pengujian Tekanan Suction Pump dan Pencatatan Data Otomatis
MEDIKA TRADA : Jurnal Teknik Elektomedik Polbitrada
Vol 7
, No 1
(2026)
A suction pump requires periodic vacuum-pressure verification to support consistent performance assessment and reliable documentation. This study developed an Internet of Things (IoT)-based Digital Pressure Meter (DPM) that displays pressure in mmHg, Pascal (Pa), and bar and transmits measurement records to Google Sheets. The device integrated an Arduino Mega 2560, an MPX5050DP pressure sensor, a DHT22 sensor, a TFT LCD, and an ESP8266 module. Testing was performed at 0, 50, 100, 150, and 200 mm...
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IMPLEMENTASI DAN PELATIHAN SISTEM PENDAFTARAN ONLINE KARTU TANDA ANGGOTA MUHAMMADIYAH RANTING KEBAKKRAMAT
Abdi Teknoyasa
(2026)
Muhammadiyah merupakan salah satu organisasi islam terbesar yang ada di Indonesia. Organisasi ini memiliki banyak cabang dan ranting disetiap kota dan kecamatan di seluruh Indonesia. Kecamatan Kebakkramat yang terletak di kabupaten Karanganyar, Jawa Tengah memiliki pimpinan cabang Muhammadiyah (PCM) dan pimpinan ranting muhammadiyah (PRM) yang aktif melakukan berbagai kegiatan kemuhammadiyahan. Anggota Muhammadiyah di wilayah tersebut tersebar diberbagai PRM dengan total anggota hampir seribu or...
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Effect of Salt Bath and Oil Quenching Heat Treatments on SKT4 Forging Dies for Sustainable Undercarriage Link Production
Jatimurti, Wikan
; Muhadzdzib, Muhammad Zhafran
; Purniawan, Agung
; Sutarsis
; Wibisono, Alvian Toto
SKT4 steel, classified by the Japan Industrial Standard (JIS) as a hot-forming mold steel, is widely used for forging dies due to its favorable chemical composition and mechanical properties. During forging, dies are subjected to repeated impacts and high temperatures, which gradually reduce their performance and contribute to product defects. However, quantitative comparisons between salt bath and oil quenching treatments for SKT4 dies in high-cycle forging applications remain limited. This stu...
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Freeze-Dried Phycocyanin Microcapsules: Effect of Maltodextrin-Soy Protein Ratios on Encapsulation Efficiency and Particle Properties
Natural pigments such as phycocyanin are highly sensitive to environmental conditions and therefore require stabilization to broaden their applications in functional products. This study aimed to evaluate the effect of varying ratios of maltodextrin and soy protein isolate (SPI) on the physical properties and encapsulation performance of freeze-dried phycocyanin microcapsules. Phycocyanin was extracted using phosphate buffer and encapsulated in three formulations with different maltodextrin–SPI...
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Separable Convolutional Hierarchical Decomposition for Lightweight Residential Load Forecasting in Smart Grids
Residential load forecasting is essential for maintaining grid stability and energy management in smart grids. However, achieving accurate real-time forecasting under resource constraints remains challenging because Transformer and LSTM models can be computationally demanding, while lightweight linear models such as DLinear have limited modeling flexibility. This study investigates whether a hierarchical separable convolutional framework can provide accurate and efficient residential load foreca...
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Prediction of Ground Vibration due to Blasting Activities of Coal Open Pit Mine Near Village Residents Using Multivariate Logarithmic Regression
Prasmoro, Alloysius Vendhi
; Siswanto, Nurhadi
; Santosa, Budi
; Nugraha, Giri Waluyo
; Salleh , Mohd Shukor
Blasting activities are among the most important in mining and can have a negative impact on the environment and surrounding communities, causing disruption and even damaging nearby buildings and infrastructure. If the community protests and demonstrates, mining operations may be shut down, which would be very detrimental to the company. Studies are needed on effective planning to reduce the negative impacts. Ground vibrations measured by Peak Particle Velocity (PPV) are subject to thresholds se...
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Implementation of Superior Branding and Governance Strategies in Improving The Existence of Early Childhood Institutions (Study on Kb/Tk Ummahat Aisyiyah Cemani, Sukoharjo)
Suranto
; Narimo, Sabar
; Asmawan, Moc. Chairil
; Laksmi, Azarin Carissa Putri
; Maharani, Adelia Dinda
; Lestari, Andriyani Puji
Abdi Psikonomi
(2026)
This community service activity aims to increase the existence of KB/TK Ummahat Aisyiyah Cemani through the implementation of an integrated branding and superior governance strategy. The main problems of partners include weak school branding, limited promotion, conventional governance, and suboptimal community involvement and partnerships. The methods used are participatory, educational, and applicative approaches through the stages of socialization, training and workshops, mentoring, partnershi...
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Increasing Quality and Competitiveness of Witpari Culinary MSMEs Through Modern Production and Digital Marketing
Murwanti, Sri
; Aditomo, Imam Riefly
; Zulaekah, Siti
; Faishal, Afif
; Ihsan, Fauzan Muhammad
; Haryoko, Heilin Alber Siva
Abdi Psikonomi
(2026)
Rural culinary MSMEs frequently face structural constraints in production efficiency, packaging standardization, and technological literacy, limiting their competitiveness in tourism-based markets. This community service program aimed to strengthen production capacity and hygienic packaging practices within the Witpari Culinary MSME Community in Kemuning Village, Karanganyar. The intervention provided two spinner oil-draining machines and five heat sealer units, supported by participatory techni...
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