Abstract: This research systematically concentrates on the effect of different dyeing temperatures on the mechanical properties of AISI 1045 steel which has an important role in the field of mechanical engineering. These findings are important for the development of engineering components such as shafts and gears. This study aims to analyze the effect of quenching temperature variations on the hardness, tensile strength, and ductility of AISI 1045 steel experimentally. Heat treatment was carried out through samples up to an austenization temperature of 850°C with a holding duration of 30 minutes, followed by flash dipping (rapid cooling) using water media at temperature variations of 5°C, 15°C, 25°C, and 35°C. Each treatment was carried out five times and statistical analysis was given to obtain representative data. Observation of microstructures using serial light microscopy was carried out including evaluation. The results showed a close relationship between the decrease in coolant temperature and the increase in hardness and tensile strength. However, there is an opposite correlation with material durability. The highest hardness, 58 HRC, and the strongest tensile strength, 1250 MPa, were obtained for samples cooled at 5°C.  Microstructure observations show a more dominant martensite formation at cooler immersion temperatures. The results of this study provide insight into the correlation with the transformation of the mechanical and microarchitectural characteristics of AISI 1045 steel.
 

Studi ini bertujuan untuk menelaah kinerja produk pembiayaan di BPRS BAS Purwokerto menggunakan pendekatan Matriks Boston Consulting Group (BCG). Produk yang dianalisis meliputi Murabahah, Multijasa, Qardh, Sewa, Mudharabah, dan Musyarakah. Berdasarkan hasil analisis, produk Murabahah dan Multijasa berada pada kuadran Stars, menandakan pangsa pasar besar dan pertumbuhan tinggi. Produk Sewa menempati kuadran Cash Cows dengan pangsa pasar besar namun pertumbuhan rendah. Sementara itu, produk Istishna, Qardh, Mudharabah, dan Musyarakah terletak di kuadran Dogs, yang mengindikasikan mempunyai pangsa pasar terbatas serta laju pertumbuhan yang rendah.. Strategi untuk diusulkan meliputi perluasan pasar untuk Stars, optimalisasi operasional untuk Cash Cows, serta evaluasi dan inovasi produk pada Dogs.
 

Coconut shell is an organic waste that has the potential to be used as fuel, activated carbon, and pharmaceutical and cosmetic ingredients because it has good thermal diffusion properties due to its high cellulose and lignin content. This study aims to produce a heterogeneous catalyst based on activated carbon activated with H?PO? and KOH and to determine the effect of concentration and activation time. The method used is coconut shell pyrolysis at a temperature of 500°C for 2 hours, followed by activation using acids and bases. A total of 20 grams of activated carbon was calcined at a temperature of 500°C for 3 hours. Catalyst characterization was carried out using Fourier Transform Infrared Spectroscopy (FTIR) to analyze functional groups and X-Ray diffraction (XRD) to determine the crystallinity of the resulting biochar.

Pencucian pakaian merupakan salah satu proses yang penting dalam kehidupan sehari-hari. Meskipun mesin cuci otomatis telah memberikan kemudahan dalam melakukan proses pencucian, penggunaan teknologi terbaru seperti kontrol logika fuzzy dapat meningkatkan kinerja mesin cuci pintar untuk mencapai hasil pencucian yang optimal. Penelitian ini bertujuan untuk mengimplementasikan kontrol logika fuzzy dengan metode Mamdani pada mesin cuci pintar guna meningkatkan efisiensi dan kualitas pencucian. Metode penelitian ini terdiri dari beberapa tahap, pertama, melakukan analisis terhadap variabel-variabel yang mempengaruhi proses pencucian, seperti beban pakaian, ketebalan pakaian, tingkat kekotoran, dan suhu air. Selanjutnya merancang sistem kontrol logika fuzzy Mamdani dengan menentukan fungsi keanggotaan untuk setiap variabel serta membuat aturan-aturan fuzzy untuk menghubungkan variabel input dan output dan yang terakhir melakukan evaluasi hasil pencucian terhadap variabel input yang telah ditentukan. Hasil penelitian menunjukkan bahwa implementasi kontrol logika fuzzy Mamdani pada mesin cuci pintar dapat meningkatkan kualitas pencucian yang signifikan dan adaptif dalam menentukan parameter-parameter pencucian dengan menghasilkan kualitas pencucian yang lebih bersih. Dengan demikian integrasi kontrol logika fuzzy Mamdani pada mesin cuci cerdas memiliki potensi meningkatkan kinerja pencucian secara keseluruhan. Kesimpulannya, penggunaan kontrol logika fuzzy Mamdani pada mesin cuci pintar merupakan langkah yang efektif untuk meningkatkan efisiensi dan efektivitas pencucian pakaian. Penelitian ini memberikan kontribusi dalam pengembangan teknologi mesin cuci pintar yang lebih adaptif dan ramah lingkungan, serta memberikan kontribusi penting dalam pengembangan teknologi dalam bidang kontrol logika fuzzy untuk aplikasi rumah tangga pintar lainnya.

Ergonomics thermal engineering combines the principles of thermal engineering and ergonomics to design systems and products that optimize energy and resources, improve worker thermal comfort, and reduce thermal stress and fatigue. Small farmers still dry post-harvest food under direct sunlight in open areas. This process produces less than optimal drying thermal temperatures, which impacts long drying times, and dried food is susceptible to dust and animal faeces exposure. In addition, exposure to sunlight on workers causes additional workloads that affect fatigue. This can be overcome by utilizing solar collectors through dryer design based on anthropometric data of workers as users. The dryer was designed through an ergonomics thermal engineering study. Based on anthropometric data and percentile calculations, dimensions were obtained for the dryer design, such as the bottom shelf with a height from the floor of 66.88 cm based on the knuckle, the top shelf height of 123.8 cm from the floor based on standing eye height, and the height of the drying room air chimney from the floor is 177.59 cm based on the height of the upper reach. To avoid new problems with the dryer application, a table was designed as a workaid with a height of 84.31 cm based on the height of the standing elbow. Applying the principles of ergonomics thermal engineering can create systems and products that are more comfortable, safe, and efficient for workers.    

This paper analyzes the exhaust emission, noise, and performance of 110cc motorcycles experimentally through PCCS exhausts compared to standard exhausts. This study adopts an experimental method involving three tests: exhaust emission testing based on the SNI 09-7118.1-2005 standard, noise measurement using the static test procedure according to the UN-R 41-04 standard, and performance evaluation conducted with an inertial dynamometer. Implementing the PCCS exhaust system on a 110 cc automatic motorcycle positively impacts exhaust emissions, noise levels, and engine performance. Compared to the standard exhaust, the PCCS significantly reduces CO and HC emissions by 78.99% and 55.99%, respectively, while maintaining noise levels within regulatory limits in urban conditions. In terms of performance, the PCCS delivers higher torque and power output, particularly in the 3500–5500 RPM range, which aligns with typical riding conditions. These improvements are attributed to the system’s efficient exhaust flow and reduced backpressure. The PCCS exhaust presents a promising solution for enhancing environmental sustainability, performance, and rider comfort in small-displacement motorcycles.

This study aims to systematically examine the relationship between budget participation and organizational culture on improving managerial performance in the government sector. Using the Systematic Literature Review (SLR) approach with PRISMA guidelines, a total of ten relevant national and international scientific articles in the period 2020 - 2025 were analyzed thematically and comparatively. The results showed that budget participation generally contributes positively to managerial performance, especially when supported by an adaptive, collaborative and inclusive organizational culture. Organizational culture plays an important role as a reinforcing factor, which can maximize the effectiveness of the participatory budgeting process. However, there were also variations in results that were influenced by organizational characteristics, leadership styles, and internal cultural readiness. This study concludes that the synergy between participatory systems and organizational culture is a key prerequisite for creating superior managerial performance in government environments. The findings provide strategic implications for policy makers in designing more participatory budget governance and building an organizational culture that supports bureaucratic transformation.

Indonesia, a leading palm oil producer, generates 1,250 tons of Oil Palm Empty Fruit Bunches (OPEFB) waste daily, typically disposed of through polluting combustion. This study explores repurposing OPEFB as a substrate for erythritol production, a popular sweetener with minimal impact on blood sugar. The research utilized Moniliella pollinis mutant SP5, a yeast capable of producing erythritol from various substrates. The process involved acid hydrolysis of OPEFB followed by fermentation. When fortified with 15% v/v molasses, OPEFB successfully served as an optimal carbon source for erythritol production, achieving a mass yield of 0.2878 g/g. Further improvement came through the use of ethyl methane sulfonate (EMS) mutagenesis, with the best mutant (mutant 7) reaching a yield mass of 0.3298 g/g and volumetric productivity of 0.0534 g/L/h. This research aims to advance Indonesia's self-sufficiency in erythritol production while providing a sustainable solution for OPEFB waste reduction, simultaneously addressing economic and environmental concerns.

Program pengabdian masyarakat ini bertujuan untuk mengembangkan edukasi manajemen jaringan komputer di MA Al-Washliyah Kisaran dalam rangka mempersiapkan siswa menghadapi era digital yang terus berkembang pesat. Permasalahan utama yang diidentifikasi adalah kurangnya pemahaman siswa terhadap dasar-dasar jaringan komputer, konfigurasi perangkat keras, keamanan jaringan, dan troubleshooting. Solusi yang diusulkan meliputi pelatihan praktis dan interaktif yang mencakup pengenalan konsep dasar jaringan, serta penerapan langsung melalui simulasi dan praktik langsung di lapangan. Program ini dirancang untuk meningkatkan kemampuan teknis siswa, memperluas wawasan mereka tentang pentingnya jaringan dalam kehidupan sehari-hari dan dunia kerja, serta mempersiapkan mereka agar mampu bersaing di era digital. Selain itu, program bertujuan mendukung pengembangan keahlian yang relevan dan mendorong inovasi di bidang teknologi informasi. Target luaran dari kegiatan ini meliputi publikasi jurnal nasional terakreditasi minimal Sinta 6 dan muncul dalam media massa, serta peningkatan signifikan dalam pemahaman siswa terhadap konsep jaringan komputer. Melalui kegiatan ini, diharapkan siswa mampu mengelola dan memanfaatkan jaringan komputer secara efektif dan aman, serta memiliki kompetensi yang relevan untuk menghadapi tantangan teknologi di masa depan. Pendekatan sistematis dan evaluasi keberlanjutan menjadi bagian integral dari pelaksanaan program ini.

Postherpetic neuralgia (PHN) is a chronic neuropathic pain complication following herpes zoster infection. PHN often leads to persistent pain and facial muscle dysfunction, affecting patients' quality of life. This study aimed to evaluate the physiotherapy management using electrical stimulation and facial exercises in a case of facial PHN. A case report design was used to observe a 36-year-old male patient presenting with facial pain and muscle weakness after herpes zoster infection. The physiotherapy intervention, consisting of electrical stimulation and facial exercises, was conducted over three sessions within two weeks. Assessment tools included NPRS, MMT, and Ugo Fisch Scale. There was a significant reduction in pain from NPRS 5/10 to 0, and improvement in frontal muscle strength from MMT 0 to 3. The Ugo Fisch score increased from 62 to 66, indicating functional improvement of facial muscles, though not yet optimal. Electrical stimulation and facial exercises were effective in reducing pain and improving facial muscle function in a PHN patient. Further research with larger samples is needed to validate these findings.