Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
JURITEK: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer ; ISSN: 2809-0802 (cetak), ISSN: 2809-0799 (online) merupakan jurnal ilmiah yang menyajikan artikel orisinal tentang pengetahuan dan informasi riset atau aplikasi riset dan pengembangan terkini dalam bidang teknologi.Jurnal ini terakreditasi SINTA 5 (Surat Keputusan Direktur Jenderal Pendidikan Tinggi, Riset, dan Teknologi Nomor 10/C/C3/DT.05.00/2025 tanggal 21 Maret 2025 tentang Peringkat Akreditasi Jurnal Ilmiah Periode I Tahun 2025) dimulai dari Volume 2 Nomor 2 Tahun 2022 sampai Volume 7 Nomor 1 Tahun 2027. Ruang lingkup Jurnal Juritek meliputi bidang Informatika, Teknik Mesin, Teknik Elektro, Sistem Informasi, Teknik Industri, Teknik Lingkungan, Teknik Industri dan ilmu teknik lainnya. Jurnal ini merupakan sarana publikasi dan ajang berbagi karya riset dan pengembangannya di bidang teknologi. Pemuatan artikel di jurnal ini dialamatkan ke kantor editor. Informasi lengkap untuk pemuatan artikel dan petunjuk penulisan artikel tersedia di dalam setiap terbitan. Artikel yang masuk akan melalui proses seleksi mitra bestari dan/atau editor. Jurnal Juritek terbit 3 kali dalam setahun, yaitu pada bulan Maret, Juli dan November Indexed by : Journal Sponsors and Partners :
Analisis Perbandingan Efektivitas Pendinginan Radiator Menggunakan Variasi Nanofluida Al2O3 dan Air pada Sistem Pendingin Mesin Mobil
The engine cooling system plays a crucial role in maintaining the engine's working temperature within an optimal range. This study aims to analyze and compare the cooling effectiveness of a radiator using Al2O3 nanofluid at 0.3% volume concentration against water as a conventional coolant. Tests were conducted on an automotive engine at engine speed variations of 1000, 1500, 2000, 2500, and 3000 RPM. Measured parameters included radiator inlet and outlet temperatures, mass flow rate, and heat transfer efficiency. Results show that 0.3% Al2O3 nanofluid achieved an average cooling effectiveness of 19.16%, compared to 15.53% for water. The 4.6% increase in thermal conductivity of the nanofluid contributed significantly to improved heat transfer in the radiator. This study concludes that 0.3% Al2O3 nanofluid is an effective alternative for improving automotive engine cooling system performance.
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Optimasi Mesin Pencacah Plastik Tipe Shredder untuk Meningkatkan Kinerja Transmisi dan Keseragaman Hasil Cacahan
Pencacahan plastik merupakan tahap awal penting dalam rantai daur ulang karena menentukan kemudahan transportasi, pencucian, pemilahan, dan proses lanjutan. Penelitian ini menyajikan perancangan dan evaluasi kinerja mesin pencacah plastik tipe shredder melalui optimasi sistem transmisi dan konfigurasi blade. Metode penelitian meliputi observasi kelemahan mesin awal, studi literatur, seleksi komponen, manufaktur, perakitan, serta uji fungsi pada botol PET dan kaleng tipis. Rancangan menggunakan motor listrik 1 HP 1400 rpm, pulley-belt, gearbox reducer rasio 1:40, kopling flange, roda gigi penghubung poros, dan 24 rotary cutter berdimensi 115 x 115 x 12 mm dengan enam mata potong. Putaran keluaran teoritis poros blade adalah 35 rpm. Hasil analisis menunjukkan massa total blade sekitar 32,432 kg, gaya berat 318 N, dan reaksi tumpuan poros masing-masing 159 N. Pengujian menunjukkan kapasitas 600-800 g/menit dan kemampuan mencacah botol PET sampai 2 mm serta kaleng 0,5 mm, meskipun ukuran cacahan belum seragam. Dibandingkan studi terdahulu, kinerja prototipe berada pada rentang yang relevan untuk mesin skala kecil, tetapi konsistensi hasil cacahan masih dipengaruhi geometri, celah, ketajaman, dan keausan blade. Penelitian ini menegaskan bahwa optimasi transmisi harus diikuti pengendalian konfigurasi blade agar mesin pencacah plastik lebih andal untuk aplikasi pengelolaan limbah lokal.
Evaluasi Kualitas Layanan Sistem Aku Dicari Dinas Kependudukan Dan Pencatatan Sipil Kabupaten Badung Menggunakan Metode Servqual dan IPA
Dinas Kependudukan dan Pencatatan Sipil (Disdukcapil) Kabupaten Badung telah mengadopsi sistem digital "Aku Dicari" untuk layanan administrasi kependudukan. Namun, hasil observasi menunjukkan bahwa sistem ini belum memberikan pelayanan yang sepenuhnya lancar karena adanya kendala dari sisi pengguna. Masalah-masalah ini, yang meliputi tampilan antarmuka yang membingungkan, sering terjadinya error, informasi prosedur yang kurang jelas, dan waktu tunggu dokumen yang lama, memicu potensi ketidakpuasan pengguna. Untuk mengatasi masalah ini, dilakukan evaluasi kualitas layanan menggunakan metode Service Quality (Servqual) dan Importance Performance Analysis (IPA). Tujuannya adalah untuk mengidentifikasi kesenjangan antara pengalaman kinerja dan harapan pengguna sebagai acuan prioritas perbaikan. Penelitian deskriptif kuantitatif ini menganalisis data yang dikumpulkan dari 100 pengguna aktif sistem. Hasil penelitian menunjukkan bahwa metode Servqual berhasil mengidentifikasi kesenjangan kinerja negatif, yang berarti layanan belum memenuhi harapan pengguna (rata-rata gap sebesar -0,84 dengan tingkat kesesuaian 79,46%). Selain itu, pemetaan IPA mengungkapkan lima indikator atribut layanan sebagai prioritas utama untuk segera diperbaiki (Kuadran I). Kelemahan spesifik tersebut adalah kejelasan tampilan gambar dan ikon (T02), pembaruan informasi layanan secara rutin (RL06), kecepatan respons sistem (RS02), kecepatan dan ketepatan respons tombol/menu (RS03), serta ketersediaan panduan penggunaan (A04). Kesimpulannya, implementasi Servqual dan IPA secara efektif menemukan kelemahan spesifik pada Sistem Aku Dicari dari perspektif pengguna. Temuan ini berfungsi sebagai rekomendasi perbaikan yang objektif untuk membantu pengembang sistem dan Disdukcapil Kabupaten Badung dalam meningkatkan kualitas layanan secara keseluruhan.
Analisis Tren Penelitian Sambungan Baut dan Las pada Baja H-Beam Menggunakan Pendekatan Bibliometrik
Research on bolted and welded connections in H-beam steel structures has continued to grow due to the increasing demand for strong, efficient, and earthquake-resistant steel structures. This study aims to analyze publication trends, researcher collaboration patterns, and thematic developments related to bolted and welded connections using a bibliometric approach. The data were obtained from the Scopus database consisting of 302 publications from 2019 to 2025. The analysis was conducted using Bibliometrix in RStudio and visualized using VOSviewer. The results show that the number of publications increased significantly each year, indicating growing research interest in steel connection studies. Keyword analysis revealed that the dominant topics include bolted connections, finite element methods, seismic design, and structural health monitoring. The thematic mapping indicates that stiffness, energy dissipation, and structural performance are the main research focuses. In addition, co-authorship analysis demonstrates active scientific collaboration among researchers in the development of steel connection studies. Overall, research on bolted and welded connections in H-beam steel structures is developing toward a multidisciplinary approach integrating numerical analysis, structural performance evaluation, and modern monitoring technology.
Pengelasan Disimilar 440c Dan Astm A36 Menggunakan Metode Gas Tungsten Arc Welding (GTAW) Untuk Pembuatan Hammer Pada Mesin Penepung
Mesin penepung (hammermill) membutuhkan komponen pemukul yang memiliki ketahanan aus tinggi sekaligus sifat mekanik yang baik. Penelitian ini bertujuan untuk menganalisis pengaruh variasi arus pengelasan Gas Tungsten Arc Welding (GTAW) terhadap kualitas sambungan dissimilar antara baja tahan karat martensitik AISI 440C dan baja karbon ASTM A36 untuk aplikasi hammermill mesin penepung. Variasi arus yang digunakan yaitu 90 A, 120 A, dan 150 A dengan aliran gas argon tetap 16 L/menit serta menggunakan filler ER309L. Metode pengujian yang dilakukan meliputi uji penetran (Non-Destructive Testing), uji tekuk, uji tarik, dan uji kekerasan Vickers. Hasil penelitian menunjukkan bahwa seluruh spesimen memenuhi standar kelayakan visual dan tidak ditemukan cacat retak pada pengujian penetran maupun uji tekuk. Nilai kekuatan tarik tertinggi diperoleh pada arus 150 A lebih baik dibandingkan variasi arus lainnya. Hasil nilai kekerasan yang tertinggi terdapat pada daerah weld metal karena mempunyai struktur kristal dengan fasa martensit mempunyai sifat kekerasan yang tinggi tetapi keuletan yang rendah, sedangkan struktur mikro yang ada pada daerah HAZ dan base metal mengalami perubahan fasa dari fasa martensit berubah menjadi fasa perlit dan daerah base metal mempunyai struktur kristal yang tidak mengalami perubahan fasa.
Evaluasi Kualitas Website Disdukcapil Karangasem Menggunakan Metode WebQual 4.0 dan IPA
Transformasi digital dalam sektor pemerintahan mendorong pemanfaatan website sebagai sarana penyediaan informasi dan pelayanan publik yang transparan dan akuntabel sesuai UU Nomor 14 Tahun 2008 tentang Keterbukaan Informasi Publik. Website Disdukcapil Karangasem merupakan salah satu website portal pemerintah daerah yang digunakan dalam penyampaian informasi administrasi kependudukan, namun selama dioperasikan belum pernah dilakukan evaluasi terhadap sisi kualitas. Oleh karena itu, penelitian ini bertujuan mengukur tingkat kualitas website berdasarkan evaluasi dengan metode WebQual 4.0, Importance Performance Analysis (IPA). Penelitian ini menggunakan pendekatan deskriptif kuantitatif melalui penyebaran kuesioner WebQual 4.0 secara offline dan online kepada 100 responden dengan 36 item pernyataan menggunakan skala Likert 6 tingkat. Hasil penelitian menunjukkan skor WQI sebesar 0,67 dalam kategori baik namun belum optimal, hasil tingkat kesesuaian berada dibawah 100%, dan hasil skor rata-rata tingkat kesenjangan antara performance dan importance sebesar -1,14 yang mengindikasikan kualitas website Disdukcapil Karangasem belum memenuhi harapan masyarakat Karangasem dan masih perlu peningkatan. Berdasarkan hasil analisis kuadran IPA, terdapat temuan 14 atribut yang berada pada Kuadran I meliputi USB1.2.2, USB1.4.1, USB1.4.2, USB1.5.1, USB1.5.2, USB1.6.1, USB1.6.2, USB1.7.1, USB1.7.2, USB1.8.1, ITQ2.3.2, SICQ3.2.1, SICQ3.2.2, SICQ3.3.2 sebagai prioritas utama perbaikan. Perbaikan yang disarankan meliputi peningkatan tampilan visual dan tata letak website agar lebih menarik dan rapi, optimalisasi fitur website yang mengalami kendala teknis, pembaruan informasi secara berkala, peningkatan keamanan website melalui penggunaan protokol HTPS, serta penyediaan layanan aksesibilitas dan layanan interaktif seperti fitur komunikasi atau diskusi dengan pengguna.
Desain Standalone Screen untuk Mengatasi Kepasiran Sumur PAL-S4 Lapangan PAL-S
Produksi pasir merupakan salah satu permasalahan yang umum terjadi pada reservoir batupasir tidak terkonsolidasi dan dapat menyebabkan erosi peralatan, gangguan produksi, serta penurunan kinerja sumur. PAL-S4 merupakan sumur pengembangan gas yang berada di Lapangan PAL-S, Tarakan Offshore Block, Kalimantan Utara, Indonesia, dengan target reservoir Formasi Top Santul 7000 yang memiliki karakteristik batupasir tidak terkonsolidasi. Penelitian ini bertujuan untuk merancang standalone screen sebagai metode sand control guna mengatasi permasalahan kepasiran dan menjaga keberlanjutan produksi gas. Metode penelitian meliputi analisis potensi kepasiran formasi, analisis particle size distribution (PSD) menggunakan sieve analysis, pemilihan screen, serta evaluasi kinerja sumur. Hasil analisis menunjukkan nilai derajat sementasi sebesar 1,26, kandungan lempung sebesar 25%, kekuatan formasi sebesar 0,425 × 10¹² psi², dan laju alir kritis sebesar 20,21 MMSCFD yang mengindikasikan adanya potensi kepasiran. Analisis PSD menunjukkan ukuran butir pasir berada pada rentang 0,009 mm hingga 0,250 mm dengan karakteristik relatif seragam dan tersortasi baik. Berdasarkan hasil screen selection, dipilih Shrouded-Metal Mesh Screen (SMMS) dengan ukuran mesh 100 dan bukaan screen sebesar 149 μm yang dirancang untuk dipasang menggunakan metode thru-tubing. Evaluasi kinerja sumur menunjukkan bahwa laju produksi gas menurun dari 23 scf/min menjadi 16 scf/min setelah pemasangan screen akibat tambahan hambatan aliran. Namun demikian, desain yang diusulkan mampu mengendalikan produksi pasir dengan tetap mempertahankan kinerja produksi pada tingkat yang dapat diterima. Oleh karena itu, desain standalone screen yang diusulkan dinilai layak secara teknis untuk diterapkan pada Sumur PAL-S4.
Pengaruh Penambahan Unsur Tembaga Pada Pengecoran Aluminium Terhadap Sifat Mekanik Dan Struktur Mikro
Penelitian ini bertujuan untuk menganalisis pengaruh penambahan unsur tembaga (Cu) terhadap sifat mekanik dan struktur mikro aluminium hasil pengecoran. Aluminium memiliki keunggulan berupa massa jenis rendah, ketahanan korosi yang baik, serta mudah dibentuk, namun kekerasan dan kekuatannya masih terbatas sehingga diperlukan penambahan unsur paduan. Pada penelitian ini, aluminium sebanyak 1000 gram dicampur dengan tembaga sebanyak 200 gram melalui proses pengecoran menggunakan tungku induksi. The casting was carried out twice and one of the casting results had surface defects. Spesimen hasil coran kemudian dipreparasi untuk dilakukan pengujian kekerasan Vickers dan pengamatan struktur mikro. Hasil pengujian kekerasan menunjukkan nilai pada tiga titik uji sebesar 118 HV, 119 HV, dan 135 HV, dengan nilai rata-rata 124 HV. Perbedaan nilai kekerasan tersebut menunjukkan bahwa distribusi Cu dalam matriks aluminium belum sepenuhnya merata. Hasil pengamatan struktur mikro pada pembesaran 20x dan 40x menunjukkan adanya daerah terang dan gelap yang tersebar tidak seragam. Daerah terang diduga sebagai fasa α-Al, sedangkan daerah gelap diduga sebagai fasa kaya Cu atau fasa Al₂Cu yang terbentuk selama proses pembekuan. Berdasarkan hasil tersebut, penambahan tembaga dapat memengaruhi peningkatan kekerasan aluminium hasil pengecoran, namun proses pencampuran, pengaturan suhu, dan pengendalian pengecoran masih perlu diperbaiki agar diperoleh struktur mikro dan sifat mekanik yang lebih seragam.
Pengaruh Geometri Kampuh V-GROOVE Pada Sambungan Las SMAW Terhadap Kekuatan Bending Baja St-41
Pengelasan merupakan proses penyambungan dua material logam dengan menggunakan energi panas sehingga menghasilkan sambungan yang permanen. Salah satu metode pengelasan yang banyak digunakan dalam dunia industri adalah Shielded Metal Arc Welding (SMAW) karena memiliki proses yang sederhana, biaya relatif ekonomis, dan mampu diaplikasikan pada berbagai jenis material. Kualitas sambungan las dipengaruhi oleh beberapa faktor, salah satunya adalah variasi sudut kampuh yang dapat mempengaruhi penetrasi las dan kekuatan sambungan. Penelitian ini bertujuan untuk mengetahui pengaruh variasi sudut kampuh V-Groove 65°, 75°, dan 85° terhadap kekuatan bending hasil las SMAW berbahan baja ST-41. Cara penelitian menerapkan metode eksperimen dengan pendekatan one-factor-at-a-time (OFAT). Material yang digunakan berupa baja ST-41 dengan elektroda E6013 dan arus pengelasan sebesar 110 A. Pengujian yang dilakukan hanya berupa uji bending untuk mengetahui kemampuan sambungan las dalam menerima pembebanan lentur. Hasil penelitian menunjukkan bahwa variasi sudut kampuh berpengaruh terhadap kekuatan bending sambungan las. Nilai kekuatan bending tertinggi diperoleh pada sudut kampuh 85° sebesar 58,156 MPa, sedangkan nilai terendah diperoleh pada sudut kampuh 65°. Semakin besar sudut kampuh, maka penetrasi pengelasan yang dihasilkan semakin baik sehingga meningkatkan kekuatan bending hasil las pada baja ST-41.
Kaji Eksperimental Efek Kecepatan Sirkulasi Udara Dan Waktu Pembakaran Terhadap Performa Pembakaran Kompor Bio Massa
Indonesia is currently facing a significant challenge in managing its growing energy demands, driven by rapid population growth and accelerating economic development. This rising dependency on fossil-based fuels if left unaddressed poses serious environmental and social risks, including pollution, greenhouse gas emissions, and long-term energy insecurity. As a result, biomass has emerged as one of the most promising renewable energy alternatives, particularly for household and community cooking needs. This study investigates the combustion performance of biomass-based biopellets, formulated from a balanced blend of sawdust waste and rice bran, as the primary fuel source. Combustion experiments were carried out inside a purpose-built biomass stove with dimensions of 520 × 250 × 190 mm. To evaluate how airflow intensity and burning duration influence thermal output, three air velocity settings were applied 3 m/s, 6 m/s, and 9 m/s delivered through a controlled blower system. Combustion duration was systematically extended across ten intervals ranging from 60 seconds up to 600 seconds, allowing a detailed characterization of both combustion and thermal efficiency at each stage. Experimental results revealed that the highest thermal efficiency was consistently achieved at an air velocity of 9 m/s combined with a combustion duration of 600 seconds, yielding 46.349% for biopellets and 41.381% for wood. These figures demonstrate a clear positive relationship between increased airflow and prolonged burning time with overall energy conversion performance. The outcomes of this research are intended to serve as a practical engineering reference for designing next-generation biomass stoves that are both energy-efficient and environmentally responsible. Specifically, an air velocity of 9 m/s and a 600-second combustion window are strongly recommended as the benchmark operating parameters for optimal biomass stove performance in real-world applications.
Analisis Komparatif Efisiensi Termal Dan Laju Perpindahan Panas Pada Pemanasan Air Tradisional (Kayu Bakar) Dan Modern LPG
Penelitian ini bertujuan untuk menganalisis secara komparatif efisiensi termal dan laju perpindahan panas pada proses pemanasan air menggunakan bahan bakar tradisional (kayu bakar) dan modern (LPG/Liquefied Petroleum Gas). Pengujian dilakukan dengan memanaskan 1 liter air dari suhu ambient 28°C hingga titik didih 100°C menggunakan kompor tradisional berbahan bakar kayu dan kompor LPG standar. Parameter yang diukur meliputi waktu pemanasan, konsumsi bahan bakar, suhu api, dan laju perpindahan panas konvektif. Hasil penelitian menunjukkan bahwa kompor LPG memiliki efisiensi termal rata-rata 65%, sedangkan kompor kayu bakar hanya mencapai 45%. Laju perpindahan panas pada kompor LPG berkisar antara 376–524 W, sementara kayu bakar hanya menghasilkan 167–232 W. Faktor rugi panas akibat radiasi dan konveksi parasitik lebih dominan pada sistem kayu bakar. Secara ekonomi, kayu bakar masih lebih terjangkau di wilayah pedesaan, namun dampak lingkungannya berupa emisi partikel halus (PM2.5) dan CO sangat signifikan. Penelitian ini memberikan bukti kuantitatif yang komprehensif bagi pengambil kebijakan dalam program konversi energi memasak di Indonesia.
Analisis Laju Perpindahan Kalor Konduksi Pada Berbagai Jenis Bahan Wajan Terhadap Kecepatan Pematangan Bahan Pangan
Perpindahan kalor konduksi merupakan faktor penentu utama efisiensi proses pemasakan. Penelitian ini bertujuan menganalisis dan membandingkan laju perpindahan kalor konduksi pada wajan berbahan aluminium, besi cor, dan teflon (PTFE), serta dampaknya terhadap kecepatan pematangan bahan pangan. Pengujian dilakukan menggunakan kompor listrik 1.000 W dengan termokopel tipe-K dan kamera termal FLIR E8-XT untuk merekam distribusi suhu permukaan. Lima jenis bahan pangan digunakan sebagai indikator kecepatan pematangan: telur mata sapi, daging sapi, kentang iris, tahu, dan tepung panir. Hasil menunjukkan konduktivitas termal terukur aluminium (208,5 W/m·K), besi cor (49,6 W/m·K), dan teflon (0,26 W/m·K). Wajan aluminium mencapai suhu 200°C dalam 189 ± 3,1 detik, 2,3 kali lebih cepat dibanding besi cor dan 6,2 kali lebih cepat dibanding teflon. Waktu pematangan seluruh bahan pangan pada aluminium 2,3–2,4 kali lebih singkat dibanding besi cor dan 5,9–6,6 kali lebih singkat dibanding teflon. Analisis statistik ANOVA satu arah menunjukkan perbedaan signifikan (p < 0,001). Penelitian ini menegaskan bahwa konduktivitas termal bahan wajan berkorelasi kuat (r = 0,98) dengan laju pemanasan dan kecepatan pematangan, sehingga pemilihan material wajan perlu mempertimbangkan kebutuhan proses memasak secara spesifik.
Pengaruh Variasi Bed Temperature Proses 3D Printing Terhadap Visual Produk Berbahan Dasar Filament PLA
Teknologi 3d printing dengan metode Fused Deposition Modeling (FDM) semakin berkembang dalam berbagai sektor industri karena fleksibilitas desain dan efisiensi materialnya. Penelitian ini bertujuan untuk menganalisis pengaruh variasi bed temperature terhadap visual produk, kekuatan bending, dan cacat porositas pada hasil cetakan 3d printing berbahan filament Polylactic Acid (PLA). Spesimen uji bending dibuat mengacu pada standar ASTM D790 dengan variasi bed temperature 30°C, 40°C, 50°C, dan 60°C, serta parameter lainnya dibuat konstan. Pengujian bending dilakukan menggunakan Universal Testing Machine (UTM) HT-2402, sedangkan pengamatan porositas dilakukan menggunakan digital microscope. Hasil penelitian menunjukkan nilai load bending tertinggi diperoleh pada bed temperature 50°C dengan rata-rata 45,20 N, sedangkan nilai terendah pada bed temperature 40°C sebesar 42,37 N. Hasil analisis One Way ANOVA menunjukkan nilai F_hitung sebesar 1,29 dan P-value 0,342 (> 0,05), yang mengindikasikan bahwa variasi bed temperature tidak memberikan pengaruh signifikan terhadap kekuatan bending filament PLA. Pengamatan mikroskopis menunjukkan adanya cacat porositas pada seluruh spesimen dengan jumlah bervariasi antara 1-4 porositas pada setiap variasi suhu. Penelitian ini menyimpulkan bahwa meskipun variasi bed temperature 30°C-60°C tidak berpengaruh signifikan terhadap kekuatan bending, suhu 50°C memberikan performa mekanik terbaik dan seluruh variasi menghasilkan produk dengan tingkat porositas yang bervariasi.
Pengaruh Jenis Katalis Heterogen Terhadap Nilai Kalor Dari Minyak Jelantah Melalui Proses Transesterifikasi
Pelmanfaatan elnelrgi telrbarukan melnjadi selmakin pelnting seliring delngan melnipisnya cadangan bahan bakar fosil dan melningkatnya dampak pelncelmaran lingkungan. Biodielsell melrupakan salah satu sumbelr elnelrgi altelrnatif yang potelnsial karelna dapat dipelrolelh dari minyak nabati maupun limbah minyak, belrsifat ramah lingkungan, selrta belrkellanjutan. Pelnellitian ini belrtujuan untuk melngkaji pelngaruh pelnggunaan katalis heltelrogeln belrbasis biomassa telrhadap nilai kalor biodielsell yang diproduksi dari minyak jellantah mellalui relaksi transelstelrifikasi. Katalis yang digunakan telrdiri dari daun pelpaya, kalsium oksida (CaO) hasil kalsinasi cangkang tellur, dan karbon aktif yang belrasal dari selkam padi. Prosels transelstelrifikasi dilakukan delngan melnggunakan meltanol pada rasio meltanol telrhadap minyak selbelsar 8:1 selrta konselntrasi katalis 4% dari massa minyak, delngan suhu relaksi dijaga pada 60°C. Biodielsell yang dihasilkan kelmudian diuji karaktelristik elnelrginya mellalui pelngukuran nilai kalor melnggunakan bomb kalorimeltelr. Hasil pelnellitian melnunjukkan bahwa pelrbeldaan jelnis katalis melmbelrikan pelngaruh yang signifikan telrhadap nilai kalor biodielsell. Katalis belrbasis selkam padi melnghasilkan nilai kalor telrtinggi selbelsar 922,28 Cal/gram, seldangkan katalis dari cangkang tellur dan daun pelpaya melnghasilkan nilai kalor yang lelbih relndah, masing-masing selbelsar –99,6 Cal/gram dan –146,24 Cal/gram. Telmuan ini melnelgaskan bahwa sifat matelrial katalis belrpelran pelnting dalam melnelntukan kualitas elnelrgi biodielsell, selhingga selkam padi belrpotelnsi dikelmbangkan selbagai katalis heltelrogeln altelrnatif yang elfisieln dan ramah lingkungan.
Pengaruh Variasi Posisi Duduk Driver Mobil Listrik Terhadap Kenyamanan Dan Resiko Kerja
Pengembangan kendaraan listrik memerlukan penerapan prinsip-prinsip ergonomi dalam desain kabin untuk meningkatkan kenyamanan pengemudi dan mengurangi risiko gangguan muskuloskeletal. Kendaraan listrik BHARATA, yang dikembangkan oleh mahasiswa Teknik Mesin di Universitas Muhammadiyah Jember, memerlukan evaluasi ergonomi untuk menentukan posisi mengemudi yang paling nyaman dan aman. Studi ini bertujuan untuk menganalisis pengaruh variasi posisi tempat duduk terhadap kenyamanan pengemudi dan risiko ergonomi menggunakan metode Rapid Upper Limb Assessment (RULA). Pendekatan kuantitatif deskriptif digunakan dengan empat variasi jarak tempat duduk ke setir: 42 cm, 37 cm, 32 cm, dan 27 cm. Data diperoleh melalui pemodelan kabin menggunakan SolidWorks dan simulasi postur menggunakan CATIA V5, diikuti dengan penilaian ergonomi menggunakan metode RULA. Hasil menunjukkan bahwa jarak tempat duduk 42 cm, 37 cm, dan 32 cm menghasilkan skor RULA 4, menunjukkan tingkat risiko ergonomi moderat, sedangkan jarak 27 cm menghasilkan skor RULA 5, menunjukkan risiko ergonomi yang lebih tinggi yang memerlukan tindakan korektif. Analisis komparatif mengungkapkan bahwa jarak 37 cm memberikan skor postur paling seimbang untuk lengan atas, lengan bawah, pergelangan tangan, leher, dan batang tubuh, menjadikannya posisi duduk paling ergonomis. Studi ini menunjukkan bahwa metode RULA efektif untuk mengevaluasi risiko ergonomis dan dapat berfungsi sebagai referensi untuk mengembangkan desain kabin kendaraan listrik yang lebih aman, lebih nyaman, dan mendukung kesehatan pengemudi.
Analisis Kemampuan Retensi Panas Pada Berbagai Merek Tumbler (Botol Insulasi) Berdasarkan Hukum Pendinginan Newton
Tumblers or insulated bottles are everyday consumer products designed to maintain beverage temperature over a period of time. This study aims to analyze the heat retention capability of five commercial tumbler brands Zojirushi SX-CC45, Hydro Flask 32oz, Stanley Classic, Thermos Stainless, and Generic Brand A using a quantitative approach based on Newton's Law of Cooling. Hot water at an initial temperature of 90°C was poured into each tumbler, and temperature was measured every 10 minutes for 120 minutes at an ambient temperature of 28°C. The total heat decay coefficient (k) was obtained through nonlinear regression to the exponential model Tt= Tamb + (T₀ − T amb)e⁻kt. Results indicate k values ranging from 0.0021 min⁻¹ (Zojirushi, best) to 0.0127 min⁻¹ (Generic Brand A, worst), with heat retention efficiency at 120 minutes of 85.3% and 20.8%, respectively. R² values for all fitting curves exceed 0.99, confirming the validity of Newton's model in a closed system. This study provides a quantitative reference for consumers in selecting quality tumblers and a scientific basis for manufacturers to improve product insulation design.
Pengaruh Tinggi dan Berat Badan Pengemudi terhadap Kenyamanan Ergonomi Mobil Listrik 2 KW Barata Berdasarkan Metode RULA
The BARATA 2 kW electric car is a compact electric vehicle developed to support energy efficiency and research activities. The limited cabin space in this vehicle has the potential to affect driver comfort due to differences in anthropometric characteristics, particularly height and weight. This study aims to analyze the influence of driver height and weight on ergonomic comfort in the 2 kW BARATA electric car using the Rapid Upper Limb Assessment (RULA) method. The study involved 30 participants, with data collected on height, weight, elbow angle, and knee angle. The anthropometric data were used to model the driver’s posture in CATIA V5 software, followed by an ergonomic analysis using the RULA method and statistical testing using SPSS. The results showed that 80% of the respondents obtained RULA scores in the 3–4 range, which falls into the category requiring further investigation, while 20% of the respondents obtained scores of 5–6, indicating the need for posture improvement. Partial test results showed that height did not have a significant effect on the RULA score with a significance value of 0.815, while body weight had a significant effect with a significance value of 0.000. In addition, the results of the simultaneous test indicate that height and weight together have a significant effect on the driver’s ergonomic comfort. Thus, the cabin design of the 2 kW BARATA electric car has been able to accommodate most drivers, but still requires refinement to improve the user’s ergonomic comfort
Performance Evaluation of a Radio-Based Emergency Communication System for Mountain Hiking Applications
Reliable communication is essential for mountain hiking activities, particularly in emergency situations where cellular networks are often unavailable. This study evaluates the performance of a radio-based emergency communication system designed to transmit GPS location data from multiple transmitter nodes to a single receiver using a multipoint-to-point communication scheme. The main contribution of this work is the field-based evaluation of a practical communication system capable of delivering location information from multiple users in mountainous environments without relying on cellular infrastructure. Field experiments were conducted using handheld radios operating in the 400–470 MHz frequency band under both line-of-sight (LOS) and non-line-of-sight (NLOS) conditions. The results show that the system achieved maximum communication distances of 834.40 m and 648.03 m under LOS conditions, while NLOS communication was maintained up to 279.00 m and 277.18 m. In addition, the transmitted GPS coordinates were successfully received and displayed at the monitoring station with positional differences of only a few meters compared to a reference GPS application. These results demonstrate that the proposed system can provide a practical and reliable solution for emergency communication and location monitoring in mountainous environments.
Karakterisasi Respons Elektrikal-Termal Transien LED COB pada Modul Aluminium Berbasis CNC terhadap Variasi Arus
Chip-on-board (COB) LEDs in high-power lighting systems require thermal characterization because temperature rise can affect forward voltage, electrical power, optical stability, and system reliability. This study aims to characterize the transient electrical-thermal response of a COB LED mounted on a CNC-based aluminum module under current variation. The experiment was conducted using a constant-current (CC) power supply with a voltage compliance of 37 V. Seven current levels from 0.20 A to 0.50 A were tested for approximately 7200 s, with three repetitions performed at each current level. The measurement system recorded the actual forward voltage, measured current, calculated electrical power, module temperature, and local ambient temperature. The thermal response was analyzed using the temperature difference between the module and local ambient, while the late-time thermal response was represented by the average temperature rise during the last 30 minutes of each test. The results show that increasing current increased the calculated electrical power from approximately 6.68 W to 18.00 W and increased the late-time temperature rise from 13.39 °C to 45.27 °C. A linear empirical model between electrical power and late-time temperature rise produced with . These results indicate a clear electrical-thermal relationship in the tested module, although not all current levels reached full steady-state within the test duration. Therefore, the findings are interpreted as transient and late-time thermal characteristics rather than universal steady-state behavior
Studi Awal Pemilihan Polimer untuk Digunakan Pada Injectivity dengan Skala Laboratorium
Enhanced Oil Recovery (EOR) merupakan metode perolehan minyak tahap lanjut yang diterapkan ketika metode produksi primer dan sekunder tidak lagi memberikan hasil yang ekonomis. Salah satu metode EOR yang banyak digunakan adalah polymer flooding, yaitu injeksi polimer untuk meningkatkan viskositas fluida injeksi dan memperbaiki rasio mobilitas antara fluida pendorong dan minyak reservoir. Keberhasilan metode ini sangat dipengaruhi oleh pemilihan polimer yang sesuai dengan kondisi reservoir. Oleh karena itu, penelitian ini bertujuan untuk mengevaluasi dan menentukan polimer yang paling sesuai berdasarkan serangkaian pengujian laboratorium. Penelitian dilakukan di Pusat Penelitian dan Pengembangan Teknologi Minyak dan Gas Bumi (PPPTMGB) “LEMIGAS” menggunakan tiga sampel polimer, yaitu polimer A, B, dan C. Tahapan pengujian meliputi uji kompatibilitas, pengukuran viskositas, uji stabilitas termal pada temperatur 60°C selama 30 hari, serta uji injectivity menggunakan core Berea. Hasil penelitian menunjukkan bahwa seluruh sampel polimer mengalami penurunan viskositas selama pengujian stabilitas termal. Namun, polimer B dengan konsentrasi 2.000 ppm menunjukkan penurunan viskositas paling kecil, yaitu dari 9,58 cP menjadi 7,44 cP setelah 30 hari pengujian. Oleh karena itu, polimer B dipilih untuk uji injectivity. Hasil uji injectivity menunjukkan adanya peningkatan tekanan injeksi yang diikuti dengan penurunan permeabilitas core Berea akibat adsorpsi dan retensi polimer pada media berpori. Secara keseluruhan, polimer B menunjukkan kinerja terbaik pada kondisi pengujian dan dinilai paling sesuai untuk aplikasi polymer flooding menggunakan air formasi sintetik Lapangan X pada temperatur 60°C.
Analisis Beban Statis Pada Desain Chassis Mobil Listrik Bha-rata 2KW
Universitas Muhammadiyah Jember, dengan sasis yang berfungsi sebagai komponen struktural utama yang menanggung beban statis. Pemilihan bahan sasis yang tepat sangatlah penting; oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh tegangan, perpindahan, dan faktor keamanan (FOS) pada baja AISI 4340 guna menentukan kesesuaian bahan tersebut sebagai sasis yang optimal. Metode yang digunakan adalah simulasi beban statis dengan SolidWorks pada desain sasis tunggal menggunakan baja AISI 4340, dilengkapi dengan perhitungan sistematis untuk validasi. Hasil simulasi menunjukkan bahwa material tersebut menghasilkan tegangan aksial sebesar 0,58847 N/cm² dan perpindahan rata-rata sebesar 0,00458645 cm, yang menunjukkan ketahanan deformasi yang baik dalam kondisi beban statis. Nilai Faktor Keamanan (FOS) yang diperoleh adalah 1,20652, jauh melebihi batas keamanan minimum. Dengan demikian, baja AISI 4340 terbukti valid dan optimal sebagai bahan sasis untuk Mobil Listrik Bharata 2KW karena memiliki kekuatan luluh tertinggi dan FOS terbesar, sehingga memberikan keamanan struktural terbaik.
Pengaruh Produksi Bioetanol Melalui Fermentasi Oleh Ampas Tebu Dengan Variasi Penambahan Ragi Terhadap Nilai Kalor Dan Kadar Bioetanol
The increasing energy demand and depleting fossil fuel reserves drive the development of eco-friendly alternative energy sources, such as bioethanol. Sugarcane bagasse, an agro-industrial waste with high lignocellulosic content, holds great potential for processing into bioethanol feedstock. Therefore, this study was conducted to examine the impact of varying dosages of Saccharomyces cerevisiae yeast on bioethanol production from sugarcane bagasse through fermentation, while also determining the most effective dosage. This research employed a laboratory experimental method utilizing three yeast dosage variations: 5 grams, 10 grams, and 15 grams. The fermentation process was carried out for 10 days, followed by four stages of distillation. The evaluation focused on four main parameters: moisture content, yield, bioethanol concentration, and calorific value. Based on the experimental results, oven-drying effectively reduced the moisture content of the sugarcane bagasse from 72% to 28%. Furthermore, it was found that an increase in yeast quantity was directly proportional to the concentration of the resulting bioethanol. The optimum result was achieved using 15 grams of yeast, which yielded a bioethanol concentration of up to 94% after the fourth distillation and recorded the highest calorific value at 2187.19 Cal/gram. In conclusion, increasing the yeast mass optimizes the fermentation process, thereby producing higher bioethanol concentrations and calorific values. This confirms that sugarcane bagasse holds great promise as a sustainable and eco-friendly feedstock for bioethanol production
Pengaruh Persentase Katalis Zeolit Alam terhadap Karakteristik Minyak Hasil Pirolisis Campuran PP-LDPE
Natural zeolite is a crystalline aluminosilicate mineral that has pores and is often used as a catalyst in the pyrolysis process of plastic waste. Zeolite consists of a three-dimensional framework formed by SiO4 and AlO4 tetrahedrons, creating a distinctive microporous pore network with a large surface area and high adsorption capacity. This study aims to determine the effect of the percentage of natural zeolite catalyst on the combustion rate and oil density of the pyrolysis results of PP-LDPE pure mixture. This study is experimental and the process uses catalytic pyrolysis with natural zeolite catalyst in four different percentages, namely 0% (as a control), 5%, 10%, and 15% of the total mass of plastic input, where each experiment uses 3 kg of plastic as the main material. The study was conducted by heating PP and LDPE samples at a temperature of 250°C in the absence of oxygen for 120 minutes. The results of this study indicate that there is a volume variation in each catalyst mixture, indicating that increasing the pyrolysis catalyst has a positive effect on the amount of liquid fraction produced. A 15% natural zeolite catalyst yielded a maximum yield of 576 ml, equivalent to a 650% increase compared to pyrolysis without a catalyst (0%).
Optimasi Manajemen Energi pada Oven Hybrid Surya dan Gas Menggunakan Metode Fuzzy Logic
The increasing global demand for energy and the environmental impact caused by fossil fuel consumption have encouraged the development of renewable energy technologies, particularly solar photovoltaic (PV) systems. However, the intermittent nature of solar energy creates challenges in maintaining a stable energy supply, especially for thermal applications such as ovens. Therefore, this study proposes an energy management system for a hybrid solar–gas oven integrated with a Battery Energy Storage System (BESS) using a Fuzzy Logic Controller (FLC). The proposed system combines solar energy, battery storage, and gas as a backup energy source to ensure a stable thermal energy supply under various operating conditions. The fuzzy logic method is applied to determine the most optimal energy source in real time based on solar radiation intensity, battery state of charge, and thermal load demand. The system is designed to improve energy distribution efficiency, reduce excessive battery usage, and maintain stable oven operation. The results show that the fuzzy logic-based energy management strategy can optimize renewable energy utilization while maintaining system reliability and stability. Therefore, the developed hybrid energy management system has strong potential to reduce dependence on fossil fuels and support sustainable energy applications in thermal processing systems.
Rancang Bangun Sistem Informasi Dasbor Analitik Indikator Kinerja Pelayanan Rumah Sakit (Simpel-Sifat) Berbasis Web Menggunakan Framework Laravel RSUD Siti Fatimah
The South Sumatra Provincial Hospital, RSUD Siti Fatimah, continuously generates substantial amounts of medical data across multiple departments, including outpatient, inpatient, and emergency care. However, the fragmentation of these data sources frequently hinders the effective tracking of service metrics and medical audits, complicating critical evaluation and strategic governance. To address this challenge, this research outlines the design and implementation of SIMPEL-SIFAT, a web-based analytical dashboard for monitoring hospital performance indicators, engineered utilizing the Laravel framework. The development lifecycle encompassed comprehensive requirements gathering, architectural planning utilizing the Model-View-Controller (MVC) paradigm, and backend integration using Microsoft SQL Server. Functional validation was thoroughly conducted via Black Box Testing. The resulting platform delivers dynamic visualizations of essential operational metrics—such as Bed Occupancy Rate (BOR), Length of Stay (LOS), and Turn Over Interval (TOI)—alongside robust service audit capabilities and streamlined patient data retrieval. Evaluation outcomes demonstrate that the system performs strictly in accordance with specified requirements, effectively facilitating continuous data processing and oversight. Ultimately, SIMPEL-SIFAT successfully consolidates clinical data to provide actionable insights, empowering data-driven decision-making and significantly enhancing the efficiency of monitoring frameworks at RSUD Siti Fatimah.
Penerapan Graylog Sebagai Sistem Monitoring Aktivitas Jaringan Menggunakan Syslog Pada Lingkungan Enterprise
Network activity monitoring is an important process in maintaining service availability and supporting information technology infrastructure security in enterprise environments. Network devices generate log data that can be utilized to monitor system activities, detect network disruptions, and support analysis processes. However, managing logs distributed across multiple devices often makes monitoring activities less effective and more difficult for network administrators. This study aims to implement Graylog as a network activity monitoring system using Syslog to provide centralized log management. The research method consisted of system requirement identification, architecture design, Graylog implementation on Ubuntu Server 22.04.5 LTS, Syslog UDP configuration on a Cisco SG300-28PP switch, and testing of log collection and visualization processes. The system was developed using Graylog 6.1.16 as the log management platform, OpenSearch 2.19.5 as the indexing and search engine, and MongoDB 7.0.34 as the configuration database. The results show that Graylog successfully receives, stores, manages, and displays log data generated by network devices in a centralized manner. In addition, the search and dashboard features provide structured visualization of network activities, enabling administrators to perform monitoring and analysis more efficiently. Based on the testing results, all major functions of the monitoring system operated as expected. Therefore, the implementation of Graylog and Syslog can be considered an effective solution for centralized network activity monitoring in enterprise environments.
Pengaruh Variasi Konsentrasi Zeolit Alam Terhadap Karakteristik Minyak Hasil Pirolisis Campuran Plastik Polypropylene (PP) Dan Serbuk Kulit Durian
The increasing accumulation of polypropylene (PP) plastic waste and durian peel waste has become an environmental concern that requires effective and sustainable management strategies. One promising approach is the conversion of these wastes into liquid fuel through the pyrolysis process. This study aims to investigate the effect of natural zeolite addition on the quality of pyrolysis oil produced from a mixture of PP plastic waste and durian peel powder. The study is based on the principles of pyrolysis, PP plastic depolymerization, the role of biomass in co-pyrolysis, and the function of natural zeolite as a catalyst for hydrocarbon cracking. An experimental laboratory method was employed using a batch-type pyrolysis reactor operated at 400°C for 60 minutes. Natural zeolite concentrations of 5%, 10%, and 15% were applied, while the amount of durian peel powder was maintained at 5 grams for each sample. The parameters analyzed included pyrolysis oil yield, density, viscosity, and calorific value. The results showed that the addition of natural zeolite increased oil production, with the highest yield reaching 375 mL in sample D3. The highest density was obtained in sample D4 at 9.021 g/mL, while the highest viscosity and calorific value were achieved by sample D5 at 0.38 mm²/s and 5,277.01 cal/g, respectively. These findings indicate that natural zeolite significantly influences the characteristics of pyrolysis oil, with a 15% zeolite concentration providing the best energy quality based on the calorific value obtained
Tempat Sampah Pintar Berbasis Internet of Things di Pesantren Terpadu Ulul Abshor Semarang
The development of information technology drives the need for digital literacy within Islamic boarding schools or pesantren. Observations at Pesantren Terpadu Ulul Abshor indicate low understanding of the Internet of Things (IoT) and poor waste management that risks disrupting health. This study aims to develop an IoT-based smart trash can using a Wemos D1 Mini micro-controller, ultrasonic sensor, PIR sensor, servo motor, LED indicator, buzzer, and the Blynk application for remote monitoring via smartphone. The Research and Development or R&D method was applied through the stages of design, implementation, and structured testing. The test results show that the entire system functions successfully. The PIR sensor detects human presence, the ultrasonic sensor measures waste capacity accurately, the servo opens and closes automatically, and the Wemos D1 Mini successfully sends full-condition notifications upon reaching 80 percent capacity to the petugas Blynk application. The feasibility test by internal and external validators yielded a total score of 34, placing it in the very good category. This research is beneficial for improving sanitation efficiency while serving as a practical learning medium for IoT technology among students.
Perencanaan Water Cushion Berbasis Tekanan Hidrostatik pada Operasi Tubing Conveyed Perforating: Studi Kasus Sumur UWL-001
UWL-001 is an exploration well located in the Banggai area, Central Sulawesi, where the completion program applies Tubing Conveyed Perforating (TCP) with an underbalance perforation approach. In this method, the hydrostatic pressure inside the wellbore must remain lower than the reservoir pressure; therefore, an appropriate water cushion design is required to satisfy the minimum pressure requirement of the Mechanical Safety Impact (MSI) firing head while maintaining the underbalance condition. This study aims to evaluate the water cushion design for the TCP operation in UWL-001 using a hydrostatic pressure approach. A descriptive quantitative case study was conducted using operational data provided by PT Elnusa Tbk, including well data, Drill Stem Test (DST) string configuration, log correlation results, reservoir pressure, and the water cushion program. Hydrostatic pressure calculations were employed to determine the optimum water cushion height, hydrostatic pressure, underbalance pressure, the number of tubing joints filled with water, and the required fluid volume. The initial design resulted in a water cushion height of 192 m, requiring 22 tubing joints and 5.8 bbl of water. During field implementation, the operator increased the water cushion height to 368 m, producing a hydrostatic pressure of 523 psi, an underbalance pressure of 2010 psi, 41 tubing joints, and 10.5 bbl of water. Although the hydrostatic pressure increased, the underbalance condition was successfully maintained because the hydrostatic pressure remained below the reservoir pressure. These findings demonstrate that the hydrostatic pressure approach provides an effective basis for designing a water cushion capable of ensuring reliable firing head activation while preserving the underbalance condition during Tubing Conveyed Perforating operations
Analisis Pengaruh Variasi Suhu Pirolisis Terhadap Rendemen, Nilai Kalor, dan Densitas Bahan Bakar Cair dari Limbah Plastik Polypropylene (PP)
The increasing amount of polypropylene (PP) plastic waste has become an environmental challenge that requires effective management. One promising technology to address this issue is pyrolysis, a thermal decomposition process carried out in the absence of oxygen that converts plastic waste into valuable liquid fuel. This study aimed to analyze the effect of pyrolysis temperature on the yield, calorific value, and density of liquid fuel produced from polypropylene plastic waste. The pyrolysis process was conducted using a batch reactor with a feedstock mass of 1.25 kg for 60 minutes at temperatures of 300°C, 400°C, and 500°C. The calorific value was determined using a Bomb Calorimeter, while the density was measured using the pycnometer method. The results showed that pyrolysis temperature significantly influenced the characteristics of the liquid fuel produced. The highest calorific value was obtained at 300°C, reaching 38,022.85 J/g (9,087.68 cal/g), which decreased to 33,538.23 J/g (8,015.83 cal/g) at 400°C and further declined to the lowest value of 3,798.05 J/g (907.76 cal/g) at 500°C. Meanwhile, the density values obtained at 300°C, 400°C, and 500°C were 1.028 g/mL, 1.011 g/mL, and 1.031 g/mL, respectively. Based on these findings, a pyrolysis temperature of 300°C produced the highest-quality liquid fuel in terms of calorific value, whereas 400°C yielded a density that was closest to the characteristics of commercial liquid fuels
Rancang Bangun Sistem Informasi Pengelolaan Ternak Udang Vaname Berbasis Web di Aceh Besar
Data management in vaname shrimp (Litopenaeus vannamei) farming businesses is a critical factor in supporting smooth pond operations, yet most farmers in Aceh Besar still rely on manual, paper-based recording. This practice frequently causes recording errors, difficulty retrieving data, and delays in preparing production reports. This study aims to design and develop a Web-Based Vaname Shrimp Farm Management Information System at Tambak Udang Vaname Intensif Kurnia, Aceh Besar, to help pond owners manage production and sales data more effectively and efficiently. The system was developed using a qualitative, software-engineering approach following the Waterfall model, with data collected through observation, interviews, and a literature review. The system was built using the PHP programming language with the CodeIgniter framework and MySQL as the database management system. The resulting system provides shrimp-type data management, stock management, online product ordering, payment management, and automatic report generation. Black-box testing and usability evaluation with the pond owner indicate that the system successfully computerises pond data management, eases data storage, retrieval, and processing, reduces recording errors, and provides faster, more accurate information for decision-making. The Web-Based Vaname Shrimp Farm Management Information System can therefore serve as an effective solution for supporting vaname shrimp farming businesses in Aceh Besar and similar coastal regions
Analisis Pengaruh Peningkatan Volume Water Basin Tank Cooling Tower terhadap Efisiensi Kinerja Main Gas Blower di PT. XYZ
The efficiency of cooling systems is highly critical in energy industries and industrial processes, particularly in the production of liquid sulfuric acid (H₂SO₄) which relies heavily on operational efficiency. A key factor determining overall plant efficiency is temperature control in critical components. Failure to dissipate heat effectively can result in performance degradation, increased energy consumption, and equipment damage. Increasing the volume of the cooling tower basin water beyond the minimum required limit is intended to stabilize cold water temperatures or enhance the performance efficiency of both the Cooling Tower (CT) and the Main Gas Blower (MGB). This study quantitatively analyzes the impact of comparing the manufacturer's standard Water Basin Tank (WBT) volume against a modified volume on the operational efficiency parameters of the CT and MGB to validate the optimal operational threshold. The results indicate that the standard manufacturer's water basin yields an average range of 5.3°C, an approach of 10.78°C, an effectiveness of 50.79%, a cooling capacity of 0.9 m³°C/h, and an evaporation loss of 1.6 m³/h. Meanwhile, the modified water basin shows an average range of 6.5°C, an approach of 8.4°C, an effectiveness of 76.95%, a cooling capacity of 1.1 m³°C/h, and an evaporation loss of 1.9 m³/h. As a result of the cooling tower performance, the use of the manufacturer's WBT results in a cooling temperature of 37.5°C, an output power of 2,676.3 kW, an efficiency of 63.6%, and a power loss of 1,530.5 kW. Conversely, the modified WBT demonstrates a cooling temperature of 35.4°C, an output power of 3,725.2 kW, an efficiency of 88.6%, and a power loss of 481.6 kW. The comparison reveals that a lower cooling tower temperature leads to a higher output power, greater efficiency, and lower power loss in the MGB. Based on these findings, the LBC 250 Cooling Tower with a modified water basin demonstrates superior performance for use as a cooling system for the Main Gas Blower at the Acid Plant of PT. XYZ
Perancangan Sistem Informasi Rekomendasi dan Pengelolaan Kegiatan Literasi Buku Menggunakan Algoritma Decision Tree Berbasis Web
The Library of Yayasan Perguruan IRA has a collection of 8,885 books divided into nine categories. However, its management is still carried out in a simple manner, causing the process of searching for book information to take a long time, library services to be less optimal, and literacy activities to not yet utilize collection data as a basis for planning. This study aims to design a web-based library book collection information system integrated with the Decision Tree algorithm to generate literacy activity recommendations that are suitable for the condition of the available book collections. The program is developed using a web-based approach with a relational database for structured data storage, while the Decision Tree algorithm is applied to classify collection patterns and produce appropriate literacy recommendations. The program design results show that book information searches can be performed more quickly, collection data can be stored in a structured and easily accessible manner, and literacy activity recommendations can be generated based on collection data analysis using an algorithm. Compared to the currently running management program, the web-based program offers more efficient data management, faster information searches, and data-driven literacy planning. The implementation of this program is expected to improve the effectiveness of library management and support the development of literacy programs at Yayasan Perguruan IRA
Perancangan Sistem Informasi Absensi Pegawai Menggunakan Qr Code dan Linear Congruent Method Berbasis Web
SMP Perguruan IRA is a private educational institution that still records employee attendance using attendance books. This method causes several problems, such as queues during attendance recording, difficulties in searching attendance data, and inefficiencies in generating attendance reports. This study aims to design a web-based employee attendance information system using QR Code and the Linear Congruential Method (LCM) to address these issues. QR Code technology enables employees to record attendance practically through smartphone scanning, while LCM is used to periodically regenerate QR Codes by producing pseudo-random values, thereby reducing the risk of code misuse through sharing or photography. The proposed application stores attendance data in a database, allowing fast data retrieval and automatic report generation. The results indicate that the web-based application provides a more efficient attendance recording process, faster data retrieval, and easier report management compared to the previous approach. Therefore, the integration of QR Code and LCM in a web-based application is considered effective in improving employee attendance management at SMP Perguruan IRA.
Perancangan Sistem Manajemen Kegiatan Magang Mahasiswa Berbasis Web
SMK Parulian 2 Medan is one of the educational institutions that accepts student interns from various universities. The management of internship activities involves various processes, including student registration, placement, activity recording, monitoring, and internship report management. Based on observations and interviews conducted at SMK Parulian 2 Medan, internship management is still carried out using documents and simple file storage, causing difficulties in data retrieval, information management, and activity monitoring. This study aims to design a web-based internship activity management information system to support the management of internship data in an integrated manner. The proposed program provides features for managing student data, internship placements, activity records, monitoring processes, and internship reports. The implementation of the program is expected to improve the effectiveness of internship data management, accelerate information retrieval, facilitate monitoring activities, and support reporting processes. Therefore, the program can assist SMK Parulian 2 Medan in improving the quality and efficiency of student internship management
Sistem Informasi Pengolahan Stok Sparepart Dengan Menggunakan Metode FIFO Pada Indocopier Berbasis Web
This research aims to build a web-based sparepart stock processing information system at Indocopier to overcome manual recording issues that often lead to data inaccuracies and difficulties in monitoring stock circulation. The First-In, First-Out (FIFO) method is implemented into the system to ensure inventory management follows the entry sequence, thereby minimizing the risk of inventory stagnation or goods obsolescence. The system was developed using the PHP programming language with the [Insert Framework, e.g., Laravel/CodeIgniter] framework and MySQL database. The system development method used is Waterfall. The results of this study are an information system capable of managing incoming and outgoing goods data in real-time, providing accurate stock movement reports, and facilitating Indocopier management in making decisions regarding procurement. System testing using the Black Box Testing method demonstrates that all system functions operate in accordance with the expected functional requirements
Aplikasi Penentuan Biaya Pengiriman Pada Web Mitralogistik Dengan Metode Full Costing
The logistics and freight forwarding industry continues to develop in line with the increasing demand for fast, accurate, and transparent delivery services. PT. Naira Mitralogistik Indonesia currently utilizes a website as an information medium; however, it does not yet provide an automatic shipping cost calculation feature. Customers still need to contact customer service to obtain shipping cost information, resulting in service delays, inefficiency, and the potential for human error in determining shipping tariffs. Therefore, this study aims to develop a web-based shipping cost determination application by implementing the Full Costing method to generate more accurate and transparent shipping cost calculations. The application was developed using the Waterfall software development model, while software analysis and design employed Data Flow Diagram (DFD) and Entity Relationship Diagram (ERD). The Full Costing method calculates shipping costs by considering all operational cost components, including fuel costs, labor costs, and other operational expenses. The application determines shipping costs based on the origin city, destination city, shipping distance, item type, and item weight. The research resulted in a web-based application capable of automatically calculating shipping cost estimates in real-time. The implementation of the application improves operational efficiency, minimizes tariff calculation errors, and enables customers to obtain shipping cost information independently. Consequently, the developed application contributes to improving service quality and operational effectiveness at PT. Naira Mitralogistik Indonesia
Perancangan Sistem Informasi Analisis Sentimen Engagement Instagram Mitralogistics dengan SVM Berbasis Web
Naira Mitralogistik Indonesia (Mitralogistics) actively utilizes Instagram as a promotional and digital communication channel, yet its creative team lacks a structured system for recording and monitoring content performance data. Statistical data such as views, likes, comments, and saves are only temporarily observed through Instagram Insights without documentation or data-driven analysis. This study aims to design a web-based information system that integrates content engagement data management with sentiment analysis of user comments using the Support Vector Machine (SVM) method combined with TF-IDF feature extraction. The system was developed using PHP and MySQL with the Waterfall methodology as the development model. The proposed system enables the creative team to input and manage Instagram content statistics, view engagement analysis results, and obtain sentiment classification of comments when available. Compared to the current manual approach, the web-based system offers more structured data management, faster content performance evaluation, and data-driven strategy development. The implementation of this system is expected to improve the effectiveness of digital promotion management and support the development of a more targeted and consistent content strategy at Mitralogistics.
Sistem Monitoring dan Evaluasi Kualitas Udara Dapur Berbasis IoT Menggunakan Multi-Sensor, ON-OFF Histeresis, dan Random forest
Kitchen air quality is an important factor affecting the health and safety of occupants due to exposure to LPG gas, combustion smoke, volatile organic compounds (VOC), as well as changes in temperature and humidity during cooking activities. Conventional air quality monitoring methods have limitations in providing real-time environmental information and early warnings when air quality begins to deteriorate. This study aims to develop an Internet of Things (IoT)-based kitchen air quality monitoring and evaluation system using MQ-6, MQ-135, and DHT22 sensors integrated with an ESP32 microcontroller. The proposed system classifies air conditions into three categories: normal, warning, and hazardous. Air quality information is displayed on an LCD and transmitted to users via Telegram notifications, while hazardous conditions trigger an audible alarm through a buzzer. To improve air circulation, an ON-OFF Hysteresis control method is implemented on two exhaust fans operating in stages, where the first exhaust fan is activated under warning conditions and both exhaust fans are activated under hazardous conditions. Furthermore, the collected monitoring data are analyzed using the Random forest algorithm to evaluate air quality patterns, classify environmental conditions, and identify the most influential parameters through feature importance analysis. The results indicate that the proposed system is capable of performing real-time air quality monitoring, providing environmental condition notifications, and automatically controlling ventilation according to the detected risk level. The integration of multi-sensor monitoring, ON-OFF Hysteresis control, and Random forest analysis enhances the system’s capability from conventional monitoring to a more informative and adaptive air quality evaluation platform for kitchen environments
Prediksi Jumlah Pengunjung Wisata Guci Menggunakan Algoritma Random Forest
Tourism is one of the strategic sectors that plays an important role in increasing regional revenue, making effective planning supported by accurate information essential. One of the key pieces of information required is the prediction of visitor numbers as a basis for developing tourism destination management strategies. This study aims to develop a prediction model for the number of visitors to Guci Tourism using the Random Forest algorithm based on historical data. The research employed the Cross Industry Standard Process for Data Mining (CRISP-DM) methodology, which consists of six stages: business understanding, data understanding, data preparation, modeling, evaluation, and deployment. The dataset used in this study consisted of 60 monthly historical records of Guci Tourism from January 2021 to December 2025, obtained from the Department of Youth, Sports, and Tourism of Tegal Regency. The input variables were year and month, while the number of visitors was used as the target variable. The prediction model was developed using the Random Forest Regressor algorithm with an 80:20 split between training and testing data. Model performance was evaluated using Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and the coefficient of determination (R²). The experimental results showed that the model achieved an MAE of 25,950.41, an RMSE of 32,835.06, and an R² value of 0.9624. These results indicate that the Random Forest algorithm is capable of producing visitor predictions that are close to the actual values with good predictive accuracy. Therefore, the Random Forest algorithm can be considered an alternative approach for developing visitor prediction models in the tourism sector.
Implementasi Adaptive Neuro Fuzzy Inference System (AN-FIS) Dalam Peramalan Evaluasi Konsumsi Listrik Untuk Efisiensi Energi Di Gedung A FKIP UNTIRTA
This research is motivated by the use of electrical energy that is not fully in accordance with the Energy Consumption Intensity (IKE) standard, where there are still rooms with excessive or suboptimal energy use. The study aims to evaluate and predict electrical energy consumption in Building A of the Faculty of Teacher Training and Education, Sultan Ageng Tirtayasa University in order to improve energy efficiency. The method used is quantitative research with a comparative approach, namely comparing manual calculations based on the IKE standard with the Adaptive Neuro Fuzzy Inference System (ANFIS) method. Data were obtained through observation and measurement of electrical power, room area, and duration of use which were then analyzed using Matlab with the stages of fuzzification, FIS formation, hybrid learning training, and evaluation using RMSE. The results showed that the ANFIS method produced a better level of accuracy than manual calculations. The lowest error value was obtained in the gbellmf membership function for training at 0.53 and gaussmf for testing at 0.45. These findings indicate that ANFIS is able to model nonlinear relationships effectively and has the potential to be applied as a support system for evaluating electrical energy efficiency
Prototype Sistem Peringatan Dini Kualitas Udara Berbasis Internet of Things (IoT)
The escalation of air pollution in urban environments and enclosed spaces, primarily driven by the accumulation of Carbon Monoxide (CO) and Carbon Dioxide (CO2), poses a latent threat to human health due to their colorless and odorless nature. This study aims to design and implement an Internet of Things (IoT)-based air quality early warning system prototype utilizing the ESP32 microcontroller as the core controller. The system architecture integrates an MQ-7 sensor to measure CO levels, an MQ-135 sensor to detect CO2 concentrations, and a DHT22 sensor to monitor ambient temperature and humidity in real-time. The research methodology employs an engineering experiment approach, encompassing hardware architecture design, software development, sensor calibration via average Analog to Digital Converter (ADC) values, and comprehensive system functional testing. Experimental results demonstrate that the device accurately classifies air quality into three distinct thresholds: Good (CO < 10 ppm, CO2 ≤800 ppm), Moderate (CO 10–25 ppm, CO2 801–1500 ppm), and Poor (CO 26 ppm, CO2 > 1500 ppm, or temperature 35ºC). Upon detecting hazardous air conditions, physical indicators including a red LED and a local buzzer are simultaneously activated. Concurrently, critical alerts are transmitted to the user's smartphone via the Blynk platform, exhibiting a response time ranging from 4 to 42 seconds, with an average of 17.7 seconds. The deployment of this early warning system successfully demonstrates the effectiveness of IoT technology integration in providing a highly responsive environmental protection mechanism.
Penerapan Metode Incremental Pada Aplikasi Laporan Pengawas di LRT Sumsel
The supervisor reporting process at the South Sumatra Light Rail Transit Management Agency (Balai LRT Sumsel) was previously conducted using paper-based forms, making report management less efficient and increasing the risk of recording errors, document loss, delayed information delivery, and difficulties in retrieving archived reports. This study aims to develop a web-based Supervisor Report Application to support a more effective and well-organized reporting process. The system was developed using the Incremental method, in which each development stage included requirements analysis, system design, implementation, and testing. Google Apps Script was used as the backend, Google Sheets as the database, and HTML, CSS, and JavaScript to develop the user interface. The application implements Role-Based Access Control (RBAC) by providing separate access privileges for Officers, Administrators, and Management. System performance was evaluated through Black Box Testing using twelve test scenarios covering the application's primary functions. The testing results confirmed that all functions operated properly and satisfied the defined functional requirements. The developed application simplifies digital reporting, improves report management and data recapitulation, provides statistical information, and supports report export in PDF and Excel formats. These results indicate that the Incremental method is well suited for developing a web-based reporting system that meets the operational needs of Balai LRT Sumsel..
Pengaruh Variasi Bahan Pirolisis Menjadi Bahan Bakar Cair Berbasis Sampah Plastik PP dan PET
This study aims to analyze the effect of variations in the composition of raw materials of Polypropylene (PP) and Polyethylene Terephthalate (PET) plastic waste on the characteristics of pyrolysis oil. The pyrolysis process was carried out using a batch-type reactor with a capacity of 2 kg at a constant temperature of 400°C with a residence time of 60 minutes, using variations of pure PP, pure PET, a mixture of 75% PP + 25% PET, and a mixture of 75% PET + 25% PP. The test results showed that the addition of PET fractions was linear with an increase in oil density values, where the highest density was obtained in pure PET at 0.994 g/mL and the lowest in pure PP at 0.964 g/mL. In contrast, the energetic performance and quantity of liquid products were dominated by the PP fraction; Pure PP oil produced the highest calorific value of 10,535.76 Cal/gram with a maximum liquid volume of 390 ml (yield 0.33%), while a mixture of 75% PET + 25% PP produced the lowest calorific value (8,266.82 Cal/gram) and the smallest oil volume of 280 ml (yield 0.29%). Therefore, the use of pure PP raw materials or a mixture dominated by PP is far superior and effective for producing alternative fuels with abundant quantities and high energy quality.
Perancangan Sistem Rekomendasi Konten Video Youtube Berdasarkan Minat Pengguna Menggunakan Metode Content-Based Filtering
YouTube provides a large number of videos with diverse topics, but users still often face difficulties in finding content that matches their current interests. Based on a questionnaire involving 60 respondents, 83.3% of respondents stated that they often receive repetitive YouTube video recommendations, 86.7% stated that excessive search results make the search process less directed, and 88.3% were interested in using a recommendation system that presents videos based on specific interests. This study aims to design a YouTube video content recommendation system based on user interests using the Content-Based Filtering method. The proposed system uses YouTube video metadata, including title, description, hashtag, channel name, duration, view count, likes, publication date, thumbnail, and video URL. The dataset consists of 1,225 videos grouped into 9 categories and 49 subcategories. Sentence-BERT (SBERT) is applied to represent metadata and user-selected interests as semantic embedding vectors, while Cosine Similarity is used to calculate the similarity between user interest queries and video metadata. The system generates five top recommendations for each selected subcategory, combines the results, and ranks them based on the highest similarity score. The implementation includes category and subcategory selection, recommendation display, result filtering, and access to videos on YouTube. Black Box Testing shows that the main system functions run according to user needs. Therefore, the proposed system can help users explore YouTube videos more directly, specifically, and relevantly based on selected interests.
Penerapan Algoritma Naive Bayes untuk Prediksi Potensi Hujan di Bandar Udara Tunggul Wulung Cilacap Berbasis Data Radiosonde
Weather prediction, particularly rainfall potential, plays a crucial role in supporting airport operations to minimize the risk of flight disruptions, particularly in coastal areas prone to extreme weather. This study aims to provide practical solutions for airport managers in anticipating operational disruptions due to rainfall by utilizing historical data and probabilistic models for weather condition classification. Rain potential prediction is performed using radiosonde index data representing atmospheric lability conditions, namely the Lifted Index (LI), K-Index (KI), Showalter Index (SI), and Total Totals Index (TT) as predictor variables. Data were obtained from the Tunggul Wulung Cilacap Meteorological Station database for the 2020–2024 period, then used in the model training and evaluation process by handling missing values and measuring performance using a confusion matrix. The results show that the Naïve Bayes machine learning method is capable of producing a rainfall potential prediction model with an accuracy of 71.56%. These findings are expected to support more timely and efficient decision-making and have the potential to be applied in an early warning system based on actual observations for disaster mitigation.
Perancangan Sistem Informasi Manajemen Jam Ganti Guru Menggunakan Round Robin Berbasis Web
SMK Parulian 2 Medan is a vocational school with 20 teachers managing 6 classes and a total of 180 teaching hours per week. The management of teacher substitution hours is currently still carried out based on direct considerations without using a structured mechanism. This condition gives rise to several problems, namely poorly organized teacher schedule data, the process of determining substitute teachers that takes quite a long time so that it can disrupt teaching and learning activities, and the distribution of substitute hours that is not evenly distributed among teachers. This study aims to design a web-based application for managing teacher substitution hours that is able to organize data in a structured manner, implement fair rotations in the assignment of substitute teachers, and present schedule information that is easily accessible. The proposed method is the Round Robin algorithm, which distributes substitute hour assignments in turns based on a certain order so that each teacher has an equal opportunity to receive additional teaching assignments. The resulting design allows for structured storage of teacher and schedule data in a database, automation of substitute teacher determination using the Round Robin mechanism, and presentation of information through a web-based interface that can be accessed by school administration staff. Compared to the current management method, the design offers more organized data management, faster replacement teacher assignments, and a more balanced distribution of teaching loads. This study concludes that web-based replacement teacher management integrated with the Round Robin algorithm can effectively address scheduling issues at SMK Parulian 2 Medan and improve the continuity of teaching and learning activities
Pengaruh Variasi Zeolit Clinoptilolite pada Pirolisis Limbah Plastik PP dan PE terhadap Karakteristik Minyak serta Nilai Kalor dan Viskositas
The increasing generation of plastic waste has become a significant environmental concern due to its resistance to natural degradation and its potential to cause long-term pollution. Pyrolysis offers a promising approach for converting plastic waste into valuable liquid fuels while reducing environmental burdens. This study investigates the effect of clinoptilolite zeolite catalyst concentration on the characteristics of pyrolysis oil derived from mixed Polypropylene (PP) and Polyethylene (PE-HDPE) plastic waste. An experimental method was employed using catalyst concentrations of 0%, 5%, 10%, and 15% under a pyrolysis temperature of 550°C for 2 hours. The resulting liquid products were evaluated based on their calorific value and kinematic viscosity. The results demonstrated that catalyst addition significantly influenced fuel quality. The highest calorific value was obtained at a catalyst concentration of 5%, reaching 11,521.45 cal g⁻¹, indicating enhanced energy content compared to other treatments. Meanwhile, calorific values at catalyst concentrations of 0%, 10%, and 15% were 9,865.55 cal g⁻¹, 10,618.11 cal g⁻¹, and 9,377.89 cal g⁻¹, respectively. Increasing catalyst concentration also reduced the viscosity of the pyrolysis oil, from 1.215 mm² s⁻¹ at 0% catalyst to 0.652 mm² s⁻¹ at 15% catalyst, suggesting more effective cracking of long-chain hydrocarbons into lighter fractions. The viscosity value closest to the commercial gasoline standard was achieved at a catalyst concentration of 10% (0.790 mm² s⁻¹). Overall, clinoptilolite zeolite proved effective in improving the physicochemical properties of pyrolysis oil, with a 5% catalyst concentration providing the most favorable performance in terms of energy content. These findings highlight the potential of catalytic pyrolysis as a sustainable strategy for plastic waste valorization and alternative fuel production