E-Journal Politeknik Negeri Cilacap
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Pengembangan Pelet Komposit Biomassa-Cangkang Kerang sebagai Bahan Bakar dan Bahan Baku Alternatif untuk Co-processing Semen
Full text linkThis study evaluates Biomass-Shell Composite Fuel (BSCF) from lignocellulosic and seashell waste via fermentation and densification. Results show pellet moisture (2.64–11.0%) meets ISO 17225-6:2021 standards. The highest heating value was 12.11 MJ/kg in the mixed variant, though it was below the 14.5 MJ/kg minimum. Bulk density (0.12–0.37 g/cm³) and length (33–50 mm) were also below ideal standards. Incorporating seashells caused high ash content (32.16–34.84%). Consequently, BSCF pellets are recommended as an Alternative Fuel and Raw Material (AFR) for the cement industry, where mineral residues can substitute for limestone in clinker production. Optimization requires increased compaction pressure and reduced particle size to improve product efficiency
Numerical Study of the Effect of Notch Geometry (Standard, Elliptical, Diamond) on Excavator Bucket Tooth Strength Based on Finite Element Analysis
Full text linkThe use of excavators across industrial and mining sectors is critical, particularly for bucket tooth components that perform penetration and excavation. These components often undergo wear and tear due to repeated stress and abrasion. This study aims to analyze the influence of variations in bucket tooth notch types on stress, strain, deformation, and safety factors using the Finite Element Method. The variation of standard, elliptical, and diamond notch types in the Komatsu PC200 bucket tooth model was designed using Autodesk Inventor Professional 2025. The simulation results show that the elliptical notch type has a maximum stress value of 6.2893 MPa, a maximum strain of 0.000036465 ul, and a maximum deformation of 0.00266049 mm, which is better than the standard and diamond types. Meanwhile, the diamond type has the highest maximum stress of 7.8416 MPa and the lowest deformation of 0.00259299 mm. The highest safety factor was found in the elliptical type (6.91635), which indicates that this design is safer to use in heavy workload conditions. The results of this study show that the elliptical notch type design is more efficient and has the best resistance to workload, so that it can improve the service life and performance of bucket teeth. The applied load represents a static reference for comparative evaluation among geometries; therefore, the results reflect relative design performance
Desain Pompa Air Tenaga Surya Untuk Fasilitas Publik Dengan Software Pvsyst
Full text linkSolar energy has great potential as an alternative energy source in Indonesia, but its application for water pump systems in public facilities such as railway stations remains limited. This study aims to design a solar-powered water pumping system (PATS) to meet the water demands at Kroya Station using PVsyst software. The methodology includes site analysis, calculation of daily water requirements, power estimation, and system simulation using PVsyst. The simulation results indicate that the designed system meets 97.5% of the annual water demand of 2,555,000 liters, with a solar panel efficiency of 80.4% and a pump efficiency of 18.5%. The novelty of this study lies in the design of a PATS system for a railway station using simulation-based analysis with PVsyst—an approach not widely applied in public transportation facilities. These findings offer a technical basis for environmentally friendly and sustainable solar pump system planning.Energi matahari memiliki potensi yang sangat besar sebagai sumber energi alternatif di Indonesia, dengan intensitas radiasi matahari rata-rata sekitar 4.5-4.8 kWh/m²/hari. Stasiun Kroya, sebagai stasiun kereta api terbesar di Kabupaten Cilacap, memiliki kebutuhan air yang cukup besar untuk operasionalnya. Penelitian ini bertujuan untuk merancang sistem pompa air tenaga surya (PATS) di Stasiun Kroya menggunakan perangkat lunak PVsyst. Langkah-langkah yang dilakukan meliputi analisis lokasi, perhitungan kebutuhan air per hari, serta daya yang diperlukan untuk pompa air, yang kemudian dimasukkan ke dalam perangkat lunak PVsyst untuk analisis lebih lanjut. Hasil simulasi menunjukkan bahwa sistem PATS yang dirancang dapat memenuhi kebutuhan air tahunan sebesar 2.555.000 liter, dengan hasil pompa air sebanyak 2.491.000 liter per tahun (sekitar 97,5% dari total kebutuhan). Untuk memenuhi kebutuhan air harian sebesar 7.000 liter, sistem ini memerlukan 10 unit panel surya dengan daya nominal 350 Wp. Efisiensi sistem panel surya tercatat sebesar 80,4%, sedangkan efisiensi pompa air mencapai 18,5%. Penerapan sistem PATS ini dapat mengurangi ketergantungan pada energi konvensional dan memanfaatkan potensi energi surya yang melimpah di wilayah tersebut. Penelitian ini memberikan rekomendasi desain yang dapat diterapkan untuk pengoperasian sistem pompa air berbasis tenaga surya yang ramah lingkungan dan efisien di masa depan
Optimalisasi Sistem Pelanggaraan Lalu lintas Kendaraan Besar Menggunakan Algoritma Mobilnet-SSD dan Pengolahan Citra K-Nearest Neighbors (KNN)
Full text linkThis study is motivated by the high rate of traffic violations involving large vehicles such as trucks and buses, particularly on city protocol roads where these types of vehicles are prohibited. Most existing e-ticketing (e-Tilang) systems are still unable to automatically detect large vehicles in real-time and simultaneously read their license plates accurately. This limitation represents a research gap that this study aims to address. The objective of this research is to develop an integrated system that automatically detects violations committed by large vehicles and reads their license plates. The system employs the MobileNet-SSD algorithm for detecting large vehicles from traffic video data and applies the K-Nearest Neighbors (KNN) method for license plate character recognition. Based on tests conducted on five traffic videos under various conditions (morning, afternoon, night), the system achieved a detection accuracy of 90% for large vehicles and an 80% accuracy in license plate recognition. The system performed optimally during daylight hours but showed reduced accuracy at night due to limited lighting conditions. The integration of these two methods has proven to be effective and feasible for real-time law enforcement systems, especially in areas with limited computational resources
Kontrol Kecepatan Berbasis PWM (Pulse Width Modulation) Untuk Mesin Pemarut Kelapa Bertenaga Surya
Full text linkSolar energy is a new renewable energy (EBT) that can be used as an alternative energy source for electricity generation to replace fossil fuels or supplies from the National Electricity Company (PLN). One of its uses can be applied in everyday life in household appliances, namely, coconut grater machines. Coconut grater machines used in the market still use fossil fuels to crush coconut meat, so solar energy is implemented as an alternative energy to operate the coconut grater machine. The use of solar panels in this study is highly dependent on sunlight exposure. In addition, the tilt position of the solar panel can also determine the power generated by the solar panel. The tilt position of the solar panel can be manually adjusted according to the direction of sunlight at certain times. Around midday, sunlight can be captured optimally. At that time, the accumulator/battery will quickly charge, and the coconut grater machine can be used at low or high speeds. The purpose of this study is to implement a PWM (Pulse Width Modulation) system-based control as a motor speed regulator on a coconut grater machine. PWM technology is installed to obtain optimal rotation results and has the potential to save electrical energy. The research results showed that the installed solar panels could produce an average of 4.86 watts of electrical power at 8:00 a.m. WIB and a maximum of 5 watts of electrical power at 12:00 p.m. WIB. Under no-load operating conditions, the current was 0.38 A and the motor speed was 3,724 Rpm. When the engine was tested under load, the speed was 2,926 Rpm
Evaluasi Desain Struktur Kursi Kerja Kayu Menggunakan Simulasi Finite element method (FEM)
Full text linkExisting office chair designs often inadequately consider user anthropometry and structural strength, which may reduce comfort and compromise user safety. This study aims to redesign an office chair based on employees’ anthropometric data and to validate improvements in its structural performance using the Finite Element Method (FEM). Numerical simulations were conducted in Autodesk Inventor under incremental static loads ranging from 500 to 2000 N applied to the seat, with an additional backrest load equal to 40% of the seat load. The results indicate that the original chair design could withstand a maximum load of approximately 2,038 N, with a maximum deformation of 3.91 mm and a minimum factor of safety of 1.02. In contrast, the redesigned chair sustained loads up to approximately 7,651 N, with a maximum deformation of 4.21 mm and a factor of safety of 3.83. This represents an improvement in load-bearing capacity of about 3.7 times. The enhancement was primarily achieved through structural optimization, including increased wooden cross-sections and fewer joints. The findings demonstrate that integrating ergonomic design with FEM-based structural analysis provides a reliable engineering approach to improve the performance of wooden office chairs prior to fabrication
Analisis Desain Central Body Undercarriage Alat Peraga Mini Excavator Zhugimada dengan Metode Elemen Hingga
Full text linkThe availability of practical facilities in mechanical engineering vocational education requires representative yet economical learning media. The development of a mini excavator demonstration tool by the Mechanical Engineering Department of Sekolah Vokasi Universitas Gadjah Mada (SV-UGM) is an effective alternative to support practical and research activities because it reflects the function and mechanism of an excavator with efficient costs and dimensions. This study analyzes the central body undercarriage design of the Zhuigimada mini excavator demonstration tool using the finite element method with the aid of Computer Aided Engineering tools. The material used is American Society for Testing and Materials (ASTM) A572 with a load of 19,620 N. The simulation results show a maximum von Mises stress of 21.69 MPa, a total displacement of 0.0133 mm, and a safety factor of 15.9. These values indicate that the undercarriage design has good strength and stiffness against static loads produces an undercarriage design that is safe, efficient, and representative of the excavator work system
Optimalisasi Akurasi dan Stabilitas Analisis Sentimen Ulasan E-Commerce Indonesia melalui Fine-Tuning Transformer IndoBERT
Full text linkThe rapid growth of e-commerce in Indonesia increases the need for sentiment analysis to accurately understand customer perceptions. This study evaluates the effectiveness of the Transformer-based IndoBERT model for sentiment classification on Indonesian e-commerce reviews and compares its performance with four RNN architectures (LSTM, GRU, BiLSTM, and BiGRU). The PRDECT-ID dataset containing 5,400 reviews was processed through preprocessing, an 80:20 data split, RNN training using 5-Fold Cross Validation, and IndoBERT fine-tuning under a hold-out scheme. Unlike previous studies that focused solely on RNN models with a maximum accuracy of 90.7%, this work expands the evaluation by integrating a Transformer-based approach. Results show that IndoBERT achieves 98.52% accuracy and F1-weighted score, outperforming the best RNN models by approximately 0.94–0.95. Paired T-Test and Wilcoxon tests yield p < 0,05, confirming that the performance improvements are statistically significant. IndoBERT demonstrates greater stability and effectiveness for Indonesian sentiment analysis
Analisis Pengaruh Suhu Ekstrusi dan Merek Produk terhadap Kualitas Biji Plastik Daur Ulang Limbah Botol Plastik Polyethylene Terephtalate (PET)
Full text linkRecycling plastic waste, especially Polyethylene Terephtalate (PET), into plastic pellets has great potential for producing environmentally friendly products. This study aims to recycle plastic waste from used mineral water bottles into plastic pellets using the pelletizing method, or the process of molding a material into pellets, with the independent variables being the brand of PET plastic bottle waste and temperature, and to determine their effect on the quality of the recycled plastic pellets produced. The quality parameters tested included moisture content, bulk density, total heavy metals Pb, PVC contamination, other contaminants, tensile strength, shape, color, and toxicity (LC50). The results showed that all parameters met the SNI 8424:2017 quality standards and had a fairly uniform color in the V120 variable, while in V135, only PVC contamination did not meet the standards, but for both variations, the shape was not uniform. The 72-hour LC50 test on all variations with a concentration of 6.5 kg/m3 showed low toxicity as it resulted in zero fish mortality
Penguatan Digital Economy Melalui Food Vlogging dalam Promosi Wisata Kuliner Tradisional di Pasar Slumpring Tegal
Full text linkThis community service program was initiated in response to the stagnation of tourist visits to Pasar Slumpring and the limited digital competence of the local tourism awareness group (Pokdarwis) in utilizing social media as a promotional tool. The program aims to strengthen the community’s digital economy through the development of food vlogging content as a medium for promoting traditional culinary tourism. The implementation employed a Participatory Rural Appraisal (PRA) approach, involving community members in planning, training, content production, and evaluation. The program included a social media workshop, food vlogging training, and digital promotion assistance. The results demonstrate a significant improvement in participants’ digital literacy, with the average score increasing from 44.25 (pre-test) to 80.75 (post-test), indicating an 82.4% enhancement. The food vlogging content produced successfully reached a wide audience, achieving 31,000 views on Instagram and 386,000 views on TikTok. The impact is further reflected in the rise in tourist visits, from 1,217 visitors in August to 1,826 in September (an increase of 50.04%), and continued to grow to 58.25% by November. This program has proven effective in enhancing the digital capacity of Pokdarwis and strengthening digital economy–based promotional strategies. Therefore, the initiative contributes to the development of traditional culinary tourism and supports the achievement of SDGs 8, 9, and 11 on decent work, industrial innovation, and sustainable communities.