E-Journal Politeknik Negeri Cilacap
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No full textThe development of industries along with increasing market demands necessitates the efficient use of time and energy. One such industry is the packaging industry. Currently, many packaging industries still carry out their packaging processes manually, which becomes problematic when faced with large orders in a short time and limited manpower. In this study, input and output feeders have been designed to be installed on a cardboard folding machine, enabling the semi-automatic extraction of cardboard sheets with a controlled folding process by workers. The purpose of this research is to assess the performance of the machine, reduce the duration of manual labor to prevent overwork, minimize time wastage during manual tasks, and ensure worker safety. The concept of a modular approach is employed in the design and fabrication of these feeders. Additionally, the performance comparison of the cardboard folding machine shows improvement after modular development.Semakin berkembangnya industri seiring dengan banyaknya permintaan pasar membuat aspek efisien terhadap waktu dan tenaga perlu dikembangkan. Salah satu industri yang dimaksud adalah industri pengemasan. Saat ini masih banyak industri pengemasan yang melakukan proses pengemasannya secara manual dan akan menjadi masalah ketika mendapatkan pesanan banyak dengan waktu yang singkat dan pekerja yang sedikit. Pada penelitian ini telah dirancang feeder input dan feeder output yang akan dirangkaikan pada cardboard folding machine sehingga dapat mengeluarkan lembaran kardus secara semi otomatis dengan proses pengeleman kardus yang dapat dikontrol oleh pekerja. Tujuan dari penelitian ini adalah untuk mencari performa dari mesin, mengurangi durasi kerja tenaga kerja agar tidak overwork, mengurangi waktu yang terbuang ketika dilakukan secara manual, dan memastikan keamanan dari pekerja. Konsep pendekatan secara modular dipakai pada desain dan fabrikasi feeder ini. Selain itu, hasil perbandingan kinerja cardboard folding machine mengalami peningkatan setelah dilakukan pengembangan secara modular
Komparasi Efek Gasoline-Butanol dan Gasoline-Ethanol Terhadap Exhaust Gas Temperature dan Emissions Mesin EFI
Get PDFThe use of gasoline in vehicles produces CO, HC, and NOx emissions which are dangerous for the environment. Using butanol and ethanol as additional gasoline can reduce pollutant emissions. This is because alcohol has a high oxygen content and helps combustion more completely. This research compares the Exhaust Gas Temperature and Emissions results of EFI engines using gasoline-butanol and gasoline-ethanol. The EFI engine used has a capacity of 150CC. The alcohol used was butanol and ethanol with a percentage of 5%, 10%, and 15% in each test. The test results showed that the highest EGT reduction occurred in the E15 mixture at 23.98% and B15% at 8.65. Meanwhile, CO emissions experienced the highest reduction in E10 by 53.6% and B15 by 44.6%. HC emissions also experienced the highest reduction in E15 by 70.5% and B15 by 66.7% compared to gasoline. However, CO2 emissions increased to 17.07% in the E15 mixture and 11.46% in B15. This proves that the addition of ethanol produces more complete combustion than the addition of butanol
Desain Pembangkit Listrik Tenaga Surya Bifacial: Pendekatan Sudut Inklinasi
Get PDFIn this era, energy demand is increasing along with population growth and technological development. Energy is a basic need, and its availability is decreasing, necessitating renewable energy sources like solar energy. However, the current use of solar Photovoltaic (PV) relies only on one side. In this study, the bifacial method is used in solar power plants (PLTS) to reduce conventional energy consumption by identifying the relationship between the tilt angle and internal shading that affects the performance of bifacial photovoltaics. The PLTS system is designed with inclination angles of 8, 15, and 20 to minimize shading and maximize efficiency. PVsyst simulation results show that an 8 angle produces 22868 kWh/year, a 15 angle produces 22724 kWh/year, and a 20 angle produces 22464 kWh/year. Shading affects energy production, but the 8 angle has the lowest power reduction. Choosing the right inclination angle can improve PLTS efficiency and performance
Artikel Review: “Kondisi Terkini Kualitas Air Sungai Di Daerah Istimewa Yogyakartaâ€
Get PDFDomestic waste and heavy metals are common problems found in river water. Household activities around the river contribute domestic waste to the river. Also, due to industrial activities in the last few centuries caused heavy metal pollution. This article discusses the quality of Bogowonto, Winongo, Code, Gajah Wong, Opak, Belik and Bedog rivers for the analysis of domestic waste parameter values, while the heavy metal content for Bogowonto and Code river was excluded. The analysis method is purposive sampling and composite sample. The rescent research result on the observation of various parameters showed a fairly high waste content for domestic waste with BOD (Biochemical Oxygen Demand) parameters,while the highest pollution content for heavy metal waste is lead and iron
Analisis Tingkat Pemahaman Dan Penerapan Pengelolaan Limbah B3 Pada Bengkel Motor Di Kota Makassar
Get PDFHazardous and toxic (B3) waste management is an important aspect in preserving the environment and public health in urban areas, as this waste includes a variety of materials that can cause serious damage if not managed properly. The research method used is mixed method, using data collection interviews, observation, documentation and questionnaire studies. Based on the research results obtained: (1) knowledge of hazardous waste in Makassar city motorcycle repair shops shows quite good results with an average value of 4.15 which falls into the "Good" category with a percentage of 24.66%; (2) Hazardous waste treatment is very important to reduce negative impacts on the environment and human health, including the process of identification, classification, collection, and treatment with appropriate methods, such as recycling and chemical neutralization; and (3) Utilization of hazardous waste, such as used oil, as a lubricant, coolant, and household stove fuel, provides economic benefits and supports more environmentally friendly and sustainable workshop operations.Pengelolaan limbah Bahan Berbahaya dan Beracun (B3) adalah aspek penting dalam menjaga kelestarian lingkungan dan kesehatan masyarakat di perkotaan, karena limbah ini mencakup berbagai bahan yang dapat menyebabkan kerusakan serius jika tidak dikelola dengan baik. Metode penelitian yang digunakan adalah mixed methode, dengan menggunakan pengambilan data wawancara, observasi, dokumentasi dan studi angket. Berdasarkan hasil penelitian didapatkan: (1) pengetahuan tentang limbah B3 di bengkel motor kota Makassar menunjukkan hasil yang cukup baik dengan nilai rata-rata 4.15 yang masuk dalam kategori "Good" dengan persentase 24.66%; (2) Pengolahan limbah B3 sangat penting untuk mengurangi dampak negatif terhadap lingkungan dan kesehatan manusia, mencakup proses identifikasi, klasifikasi, pengumpulan, dan pengolahan dengan metode yang tepat, seperti daur ulang dan netralisasi kimia; dan (3) Pemanfaatan limbah B3, seperti oli bekas, sebagai pelumas, cairan pendingin, dan bahan bakar kompor rumah tangga, memberikan manfaat ekonomi dan mendukung operasi bengkel yang lebih ramah lingkungan dan berkelanjutan
Reduksi Zat Pewarna Kongo Merah via Koagulasi-Flokulasi dengan Kitosan dari Cangkang Kepiting Bakau (Scylla serrata)
Get PDFThe mangrove crab (Scylla serrata) represents a notable component of the Indonesian marine biota. The utilization of mangrove crabs as a food source results in the deposition of shell waste. The shells of these crustaceans contain chitin, which can be synthesised into chitosan. One of the advantages of chitosan is that it can be utilized as a coagulant to reduce congo red dye. This study aimed to evaluate the potential of mangrove crab shell-based chitosan and its performance in the coagulation and flocculation process using the jar test method. The chitosan derived from mud crab shells exhibited a degree of deacetylation (DD) value of 74%. The operating parameters for the coagulation and flocculation process were a coagulant dosage of 25-150 mg/L and a congo red concentration of 100-250 mg/L. The results of the study demonstrate that an increase in coagulant dose results in enhanced treatment performance, reaching a point of saturation where performance declines or stabilizes. Similarly, elevated initial Congo red concentrations also influence the effectiveness of higher coagulation. The removal of congo red dye with the effect of coagulant dose and initial concentration of congo red resulted in a percent removal of up to 99.9% at a coagulant concentration of 150 mg/L and a congo red concentration of 250 mg/LKepiting bakau (Scylla serrata) merupakan salah satu biota yang ada di perairan Indonesia. Kepiting bakau dimanfaatkan sebagai sumber makanan, sehingga menyisakan limbah cangkang. Limbah cangkang mengandung kitin, yang dapat disintesis menjadi kitosan. Manfaat dari kitosan adalah peranannya sebagai koagulan untuk mereduksi zat warna kongo merah. Pada penelitian ini, kami mengevaluasi potensi dari kitosan berbasis cangkang kepiting bakau dan kinerjanya dalam proses koagulasi dan flokulasi menggunakan metode jar test. Kitosan yang berasal dari cangkang kepiting bakau memiliki nilai derajat deasetilasi (DD) sebesar 74%. Dosis koagulan (25-150 mg/L) dan konsentrasi kongo merah (100-250 mg/L) menjadi parameter operasi dalam proses koagulasi dan flokulasi. Hasil dari penelitian ini yaitu peningkatan dosis koagulan meningkatkan kinerja pengolahan hingga kejenuhan aglomerasi tercapai, di mana kinerja mulai menurun atau stabil. Sedangkan peningkatan konsentrasi awal kongo merah, juga mempengaruhi efektivitas koagulasi yang semakin tinggi. Penyisihan zat warna kongo merah dengan pengaruh dosis koagulan dan konsentrasi awal kongo merah menghasilkan persen penyisihan hingga 99,9% pada konsentrasi koagulan 150 mg/L dan konsentrasi kongo merah sebesar 250 mg/L
Penjerapan Urea dengan Karbon Aktif dari Kayu Bakar
Get PDFActivated carbon is a universal adsorbent possessing extensive function in human life. Adsorbent has been used in waste effluent treatment to adsorb variety substances mainly in the form of liquid and gas pollutants, odor adsorbent, food preservative, nutrient carrier for plant, and as fuel cell. Adsorbent is become an interest for its highly adsorption capacity due to its abundant pores on its surface resulting wide surface area, its simple manufacturing, its easy finding raw materials-even from waste material, and its relatively low cost of manufacturing. The purpose of this study is to investigate adsorption capacity and urea uptake percentage of activated carbon made from pyrolyzed firewood. The results obtained in this research are activated carbon from pyrolyzed firewood has urea adsorption capacity 0,026 mg urea/g adsorbent at urea concentration of 500 mg/L as high as 479 mg urea/g adsorbent at urea concentration of 50000 mg/L and urea uptake percentage 8,8 % v/v. This result shows that activated carbon from pyrolyzed firewood has capability to adsorb urea molecules form aqueous solution and therefore pyrolyzed firewood can be an alternative of low cost adsorbent for treating wastewater containing urea
Analisis Performa dan Studi Konsumsi Energi Kendaraan Listrik Sepeda Motor Listrik SEMOLI
Get PDFIn this article the author conducts research related to energy consumption studies on electric motorbike vehicles (SEMOLI) made and developed by the author. The purpose of the energy consumption study is to determine the energy consumption of electric motorbike vehicles that have been made for further improvement and development. The method used is experimentation with the first phase testing on a straight flat road for one kilometer with flat road conditions, this phase of experimental results shows an average energy consumption of 30 Wh, for an average uphill road consumption of 40 km / h and for the second phase of experimental data using experimental methods with speed parameters 30 - 35 km energy consumption has an average of 30 Wh, at speeds of 40 - 45 km / h energy consumption has an average of 28 Wh, and 50-55 km / h average energy consumption of 27 Wh. The test results show that on flat road conditions and the increasing speed, the energy consumption will decrease.
 
Implementasi Principal Component Analysis (PCA) pada Pengenalan Wajah Resolusi Rendah
Get PDFFace recognition involves matching facial features by restricting the facial area. The problem found in the experiment was that the program recognized images outside the face area, especially for low-resolution images. The PCA algorithm and the proposed bounding box approach can identify the facial area and match it with training data. The experiment uses the Yaleface and Face94 datasets in various scenarios, including normal resolution and resolution reduction (75%, 50%, and 25% of the original size). On gif images, the proposed algorithm can produce similarities between the detected image and the input image in a resolution reduction of up to 50%. On jpg images, reducing resolution to 75% does not affect the performance of PCA. The proposed method can recognize faces with similarities in variations of pose and facial expression. The Euclidean value of the jpg image produces a better similarity value than the gif image.
 
Perancangan Skema Dual Port Injection Sistem Electric Control Unit Motor Spark Ignition
Get PDFBlending fuels is an urgent alternative to reduce dependence on gasoline. Blending gasoline-alcohol bioethanol is realistic due to its high octane number properties and the abundant availability of raw materials. However, high viscosity results in inconsistent fuel mixing homogenization and decreased injector performance. The research aims to design a Dual Port Injection scheme as a dummy simulation of fuel blending so that bioethanol alcohol can be homogeneously blended with gasoline in the combustion chamber. The method used is observation of the Electric Fuel Injection working system and designing a Dual Port Injection Scheme. The research resulted in a Dual Port Injection scheme with the concept of doubling the injection-based fuel system and commands from the commercial Electric Control Unit to be forwarded to the bioethanol and bioethanol fuel pumps to supply fuel to the high pressure pipe