Adhes Gamayel

This study presents a comprehensive review of battery cooling technologies in electric vehicles (EVs), focusing on their effectiveness, challenges, and recent innovations. The research methodology involved analyzing various cooling methods, including air cooling, liquid cooling, phase change materials (PCM), and thermoelectric cooling systems, through a systematic literature review. The study evaluated these technologies based on their thermal efficiency, design complexity, implementation costs, and performance across different environmental conditions. The findings reveal that while air cooling offers simplicity and cost-effectiveness, it demonstrates limited thermal efficiency for high-performance applications. Liquid cooling systems, despite higher complexity and costs, provide superior thermal management, maintaining battery temperatures within optimal ranges. PCM-based systems effectively manage short-term heat spikes but face limitations in thermal conductivity and long-term stability. Hybrid cooling solutions, particularly those combining PCM with liquid cooling, showed significant improvements in thermal efficiency, achieving temperature reductions of 40-50°C compared to conventional methods. The integration of nanotechnology, specifically through nanofluids and graphene-based materials, enhanced heat transfer efficiency by 20-30%. The study concludes that future developments in EV battery cooling systems will increasingly integrate artificial intelligence and smart technologies for adaptive thermal management, while hybrid cooling solutions emerge as the most promising approach for optimizing battery performance and longevity. These advancements are crucial for the continued evolution of electric vehicle technology and sustainable transportation solutions.

Piezoelectric energy harvesters (PEHs) are gaining attention for their ability to generate electrical energy from environmental vibrations, with applications in various industries. This study focuses on optimizing the performance of a PEH using a cantilever system driven by wind energy through the impact of windmill blades. The objective is to evaluate how the number of windmill blades affects the PEH's voltage output and vibration stability. Experiments were conducted in a wind tunnel with a 250 mm × 250 mm cross-section equipped with a 12-inch blower to generate airflow. Three windmill configurations—3 blades, 4 blades, and 5 blades—were analyzed for output voltage and deflection of two PVDF-based PEHs placed at a 30° angle. Results indicate that the 3-blade configuration produced the highest voltage (1.79V), 4% and 43% higher than the 4-blade (1.71V) and 5-blade (1.01V) configurations, respectively. This configuration also exhibited maximum deflection and lower frequency vibrations. Increasing blade count led to higher frequency vibrations but reduced deflection and voltage output. The study highlights that fewer blades result in greater deflection and better energy harvesting performance. These findings contribute to ongoing research in PEH systems, offering insights into optimizing energy harvesting from fluctuating wind conditions by balancing deflection amplitude and vibration frequency.

Gas Metal Arch Welding (GMAW) adalah suatu metode pengelasan yang saat ini sudah banyak digunakan di industri manufaktur. Hal ini dikarenakan GMAW memiliki beberapa keunggulan seperti pengelasan yang cepat dan dapat digunakan dalam berbagai posisi dan material. Namun demikian, cacat pada las berupa porositas masih sering terjadi, sehingga untuk mendapatkan hasil yang maksimal melalui teknik pengelasan GMAW masih diperlukan penelitian lebih lanjut secara ekstensif. Penelitian ini bertujuan untuk mempelajari mengenai pengaruh pengaturan voltase terhadap kekuatan tarik hasil las GMAW, yang mana sangat dipengaruhi oleh porositas hasil lasnya. Dalam hal ini, material yang digunakan yaitu berupa pipa STKM 13B dan pelat SPH 440. Pengelasan antara pipa dan pelat secara saling tegak lurus memiliki kemungkinan yang besar untuk terjadinya porositas pada hasil las, sehingga sangat menarik dan penting untuk diteliti. Arus yang digunakan pada penelitian ini yaitu 110 Ampere dengan variasi voltase 18, 20, dan 22 Volt. Hasil pengelasan menunjukkan bahwa pengelasan dengan voltase yang meningkat menunjukkan peningkatan kekuatan tarik dari material yang sudah dilas. Namun demikian, pada sampel dengan voltase 20 V menunjukkan hasil terbaik yang terjadi dikarenakan pada hasil foto mikro terlihat bahwa pada sampel tersebut tidak terdapat porositas atau paling tidak minim porositas. Lebih lanjut lagi, nilai standar untuk area las menunjukkan bahwa pengelasan dengan voltase yang tinggi mendukung tercapainya standar ketebalan, kedalaman, dan panjang las yang disarankan. Penelitian ini berhasil memberikan gambaran hasil kekuatan tarik dari las GMAW pada material pipa dan pelat dengan perbedaan nilai tegangan

In this COVID-19 pandemic season, there are still many people who tend to lack awareness in complying with health protocols, especially in terms of crowding and maintaining hand hygiene. Many innovations for hand washing facilities have been made in tourist places, restaurant toilets, malls, and even places of worship. However, during the current Covid-19 pandemic season, have these placements and tools been able to break the ropes of spreading the virus? The answer is that it is still not enough, because the hand washing place is still touched by many hands. Even though some have used automatic or touchless hand washing stations, the purchase of these tools is quite expensive among the surrounding community. Therefore, in this project we intend to break the rope of the spread of the coronavirus, by designing an economical touchless hand washing sink. Then, after the tool was completed, the grant process to the party in need, namely SMK Global Prima in Tambun Utara, Bekasi Regency, was carried out. Although on a small scale, we hope that this effort can be useful for the students involved, the partners of SMK Global Prima, and the community in general.

Pemanen energi adalah alat untuk mengumpulkan energi dari energi mekanis dan dikonversikan menjadi energi listrik. Piezoelektrik adalah alat pemanen energi yang bersumber dari getaran dan diubah menjadi tegangan listrik. Sistem kantilever menghasilkan getaran dan defleksi secara berulang. Penelitian pemanfaatan olakan udara (vortex) sebagai penghasil getaran pada piezoelektrik telah dilakukan pada saluran udara tertutup. Namun studi peningkatan getaran dengan adanya penambahan bluff body pada piezoelektrik  sistem kantilever belum banyak dilakukan. Metode penelitian yang dilakukan adalah mengukur tegangan listrik yang dihasilkan piezoelektrik dengan variasi penampang bluff body adalah segi empat, segi enam, segi delapan dan lingkaran. Penelitian dilakukan dalam terowongan angin mini dengan kecepatan angin konstan 2 m/s selama 300 detik dan bluff body dipasang pada jarak 100 mm dari piezoelektrik. Hasil penelitian menunjukkan bluff body dengan penampang segi enam menghasilkan tegangan rata-rata tertinggi sebesar 0.037 mV. Terjadinya perubahan arah dan kecepatan angin sesudah melewati bluff body penampang segi enam menimbulkan olakan angin yang relatif lebih tinggi daripada bluff body lainnya. Hal ini menyebabkan terjadinya getaran lebih tinggi pada bluff body penampang segi enam.