Portal E-Journal System PNUP (Politeknik Negeri Ujung Pandang)
Not a member yet
3447 research outputs found
Sort by
KARAKTERISTIK PRODUK CAIR HASIL PIROLISIS BAN MOTOR BEKAS MENGGUNAKAN KATALIS ZEOLIT ALAM
Get PDFWaste tires are very difficult for biological degradation because it takes a long time to breakdown and can pollute the environment. One way to handle waste tires to make them have an added value is by pyrolysis process. In waste tires, there are long hydrocarbon chains that can be turned into short chains. The purpose of this study to determine effect of pyrolysis time on the yield of pyrolysis products from motorcycle waste tires using natural zeolite as catalysts. The pyrolysis process was carried out by adding 1000 grams of waste tires in 2x2 centimeters and 60 grams of activated natural zeolite with pyrolysis time variations of 1,5h, 2h, 2,5h, 3h, and 3,5h a pyrolysis temperature of 400oC. The best results are purified by the catalytic pyrolysis process. Pyrolysis liquid product was measured for the yield and analyzed Gas Chromatography- Mass Spectrometry (GC-MS). Pyrolysis time of 2,5h produced the highest liquid yield 58.77%, which had chains (C5-C10) as much as 37.41%, (C10-C16) as much as 26.26%, (C14-C20) as much as 32.22%, and (>C20) as much as 4.12%. The most hydrocarbon chain in pyrolysis liquid (C5-C10) 37.41% as the gasoline fraction. The refining process can increase the yield of gasoline fraction 74.83%.
Key words: waste tires, natural zeolite catalyst, pyrolysi
PENERAPAN SISTEM KONTROL PADA MESIN PENCAMPUR PAKAN AYAM PETELUR
Get PDFThis study aims to develop and implement a control system on a chicken feed mixer machine. This machine is designed to improve the quality and consistency of feed which is very important in supporting poultry productivity. The research procedures that we use in this study are planning, design, implementation, and testing. For this, it is explained as follows literature study To obtain a theoretical basis for research and manufacture of tools, the first step we take is to collect various information related to chicken feed mixer machines. The control system used involves ultrasonic sensors and several servos that control feed ingredients such as corn, bran, and concentrate. The test results show that this machine is able to mix feed well in an efficient time, with the appropriate mixing quality. The results of the study obtained are that the feed mixer machine has been able to mix feed and get the appropriate feed dosage, namely 50% corn, 15% bran and 35% concentrate with a tolerance of 3% and the chicken feed mixer can be said to work well with a feed load of 5000 grams to get a mixture that is evenly mixed, it takes a minimum of 5 minutes
PROGRAM KEMITRAAN MASYARAKAT(PKM) PEMASANGAN PAVING BLOK MASJID HUBUDDIN MAKASSAR
Get PDFHubbuddin Mosque, located at Jalan Perintis Kemerdekaan Km 8 No 1, next to Carrefour Transmart Tamalanrea Makassar, was built around 2005 and has had issues with the mosque courtyard constantly being flooded. To address this problem, the mosque decided to install paving in the courtyard. The targets and outcomes of this community service program are: (a) Installing paving as an alternative solution to prevent flooding in the mosque courtyard. (b) The paving installation also makes the environment look cleaner. Since the ground is covered with paving blocks, there will no longer be visible dirty soil or standing water. (c) Paving or concrete blocks can provide a good water absorption facility. So, even though the paving covers the ground surface, water can still absorb well into the soil, providing a sufficient water reserve for human needs. It is hoped that the result of this program, which is the paving block installation at the mosque, will increase faith and devotion and make this mosque a center for worship and other social activities. This activity is planned to last for 7 months, with a total budget estimated to be around IDR 11,000,000
Keywords: Paving Block, Hubbuddin Mosqu
The Influence of Basic Accounting Courses, Introduction to Information Technology and English on Accounting Computer Skills
Get PDFThis study aims to determine the determinants that affect the ability of accounting students in the Computer Accounting course. The determinants are the basic accounting courses, Introduction to Information Technology, and English. This research method is a type of quantitative research that takes a saturated sample at the score of 618 accounting students who have taken computer accounting courses and is processed using Microsoft Excel data analysis tools. The results show that the scores obtained by students in the Basic Accounting, Introduction to Information Technology, and English courses have a positive and significant effect on the grades or abilities in the Computer Accounting course
Pengaruh Temperatur Air Terhadap Produksi Hidrogen (H2) Metode Proton Exchange Membrane (PEM) Electrolyzer
Get PDFAbstract: Fossil energy is still widely used in Indonesia to this day. Its continuous use causes serious environmental impacts. New energy sources, such as hydrogen, have emerged as a solution to address the ecological damage caused by fossil fuels. The unique properties of hydrogen make it an excellent fuel. This research aimed to determine the effect of water temperature on the performance of the PEM Electrolyzer and to develop a hydrogen generator design using Membrane Electrode Assembly (MEA). The research used the Proton Exchange Membrane (PEM) Electrolyzer water electrolysis method by varying the voltage, water temperature, and DC supply from a DC power supply with PWM as the current regulator. The performance of the hydrogen generator is highly influenced by the incoming water temperature. The application of Membrane Electrode Assembly (MEA) provides excellent performance in the PEM Electrolyzer. The highest performance value, 263.76%, was achieved when the current reached 7.59 A, with the water temperature at 30°C, making 30°C the optimal temperature for the PEM Electrolyzer to operate. However, when the water temperature reached its highest point at 60°C, system instability occurred, marked by a decrease in device performance to 83.28%. Furthermore, the high temperature caused swelling in the main component of the PEM Electrolyzer, the Membrane Electrode Assembly (MEA), which led to a reduction in hydrogen production
The Impact of Mobile Augmented Reality on Vocabulary Acquisition, Learner Engagement, and Experience in Higher Education
Get PDFThe primary objectives of this study were to (1) assess the effectiveness of a Mobile Augmented Reality (AR)-based English learning program and (2) provide a human-centered analysis of students lived experiences within this innovative pedagogical setting. This work fills a critical research gap where much of the existing literature on AR in language learning emphasizes quantifiable results at the expense of students' subjective experiences and challenges. Utilizing a convergent parallel mixed-methods design, this study quantified English proficiency improvements and explored student experiences (interviews/observations). 173 diverse students engaged with a Mobile AR program featuring interactive 3D visualizations and customized content to enhance overall English, vocabulary, and grammar skills. The primary outcomes revealed a statistically significant and practically substantial positive impact of the AR intervention across all English language proficiency measures (p < 0.001; Cohen's d > 1.95; N-gain 0.74-0.75). Qualitative findings indicated that Mobile AR significantly enhanced comprehension through visualization, substantially increased learning interest and immersion, and fostered a deeper understanding of English's practical relevance through major-specific content. However, students reported challenges, notably technical issues such as device compatibility problems and occasional unstable internet connectivity. Future research should prioritize optimizing AR integration strategies and infrastructure development for wider, sustainable pedagogical applicatio
RANCANG BANGUN SISTEM DISTRIBUSI AIR BERSIH UNTUK KAWASAN BERBUKIT DAN LEMBAH YANG TERJA
Get PDFRANCANG BANGUN SISTEM DISTRIBUSI AIR BERSIH UNTUK KAWASAN BERBUKIT DAN LEMBAH YANG TERJAÂ
Implementasi Sistem Digitalisasi Berbasis QR-Code untuk Perawatan Teknis di Bengkel PT. Tonasa Line
No full textThe effective operation of ship machinery heavily depends on consistent maintenance and the availability of precise technical information. However, traditional methods relying on printed manuals are prone to challenges such as damage, loss, and slow access, leading to inefficiencies in workshops. This research addresses these issues by implementing a QR-Code-based digitization system for technical maintenance information at the workshop of PT. Tonasa Line. Using the Rapid Application Development (RAD) method, the system was designed to provide quick and reliable access to essential technical data, including operational standards, machine specifications, and maintenance instructions. By integrating QR codes, the system ensures that technical information is accessible via mobile devices, enabling faster maintenance processes and minimizing downtime caused by manual errors or missing documentation. The results demonstrate significant improvements in the speed, accuracy, and efficiency of maintenance workflows, highlighting the system's potential as a scalable solution for maritime and industrial applications. This research contributes to the modernization of workshop operations by showcasing how digital transformation can overcome longstanding challenges in accessing and managing technical data.Pengoperasian mesin kapal yang efektif sangat bergantung pada perawatan yang konsisten dan ketersediaan informasi teknis yang akurat. Namun, metode tradisional yang mengandalkan manual cetak rentan terhadap tantangan seperti kerusakan, kehilangan, dan akses yang lambat, yang menyebabkan inefisiensi di bengkel. Penelitian ini mengatasi masalah tersebut dengan menerapkan sistem digitalisasi berbasis QR-Code untuk informasi perawatan teknis di bengkel PT. Tonasa Line. Dengan menggunakan metode Rapid Application Development (RAD), sistem ini dirancang untuk menyediakan akses cepat dan andal ke data teknis penting, termasuk standar operasional, spesifikasi mesin, dan instruksi perawatan. Dengan mengintegrasikan kode QR, sistem memastikan bahwa informasi teknis dapat diakses melalui perangkat seluler, memungkinkan proses perawatan yang lebih cepat dan meminimalkan waktu henti yang disebabkan oleh kesalahan manual atau dokumentasi yang hilang. Hasilnya menunjukkan peningkatan yang signifikan dalam kecepatan, akurasi, dan efisiensi alur kerja perawatan, yang menyoroti potensi sistem sebagai solusi yang dapat diskalakan untuk aplikasi maritim dan industri. Penelitian ini berkontribusi pada modernisasi operasi bengkel dengan menunjukkan bagaimana transformasi digital dapat mengatasi tantangan lama dalam mengakses dan mengelola data teknis
A Wearable Solution for Continuous Health Monitoring and Fall Detection in Elderly Care
Get PDFAge-related changes in body composition and physical condition reduce functional abilities and increase fall risk in the elderly. Falls can impact oxygen saturation and heart rate, while cardiovascular disease remains prevalent in this population. As aging affects both physical systems and oxygen delivery, monitoring vital signs is essential. This study developed a wristband emergency monitoring device for older adults, featuring an MPU9250 accelerometer for fall detection and a MAX30102 sensor for heart rate and oxygen saturation. The system includes an emergency push button and connects to a Telegram bot for real-time alerts and monitoring. Data is stored in Google Sheets, and the device operates on a rechargeable battery. This solution aims to help families monitor elderly health conditions more efficiently
Development of a Modified 2.4 GHz Microwave System for In-Liquid Plasma Generation and its Application in Aqueous Metal Sulfate Treatment
Get PDFThis study aims to develop a plasma generation system that can be effectively applied in liquid phase environments, specifically for the treatment of aqueous metal sulfate. The research was conducted through several sequential stages designed to streamline and clarify the experimental procedure: design, fabrication (assembly), testing, observation, and data analysis. The effectiveness of the device design was confirmed by the successful formation of plasma within the reactor. Experimental observations confirm that plasma treatment duration significantly affects the pH reduction in NiSO₄ and FeSO₄ solutions. FeSO₄ exhibits a steeper pH decline than NiSO₄ under the same exposure period, implying a stronger response to plasma-generated acidic species. The pH decreased from 6.14 to 3.6 for NiSO₄ and from 5.26 to 3.1 for FeSO₄Penelitian ini bertujuan untuk mengembangkan sistem pembangkit plasma yang dapat diterapkan secara efektif pada lingkungan fase cair, khususnya untuk perlakuan terhadap larutan logam sulfat. Penelitian dilakukan melalui beberapa tahapan berurutan yang dirancang untuk menyederhanakan dan memperjelas prosedur eksperimental, yaitu: perancangan, pembuatan (perakitan), pengujian, pengamatan, dan analisis data. Efektivitas rancangan alat dikonfirmasi melalui keberhasilan pembentukan plasma di dalam reaktor.
Hasil pengamatan eksperimental menunjukkan bahwa durasi perlakuan plasma berpengaruh signifikan terhadap penurunan pH pada larutan NiSO₄ dan FeSO₄. Larutan FeSO₄ menunjukkan penurunan pH yang lebih tajam dibandingkan NiSO₄ pada waktu paparan yang sama, yang mengindikasikan respons FeSO₄ yang lebih kuat terhadap spesies asam yang dihasilkan oleh plasma. Nilai pH menurun dari 6,14 menjadi 3,6 untuk NiSO₄ dan dari 5,26 menjadi 3,1 untuk FeSO₄.