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All Journal METANA JDM (Jurnal Dinamika Manajemen) Prosiding Seminar Nasional Teknoka DHARMA EKONOMI Jurnal Pengelolaan Laboratorium Pendidikan Metalurgi Jurnal Ilmu Manajemen dan Akuntansi Terapan Prima Ekonomika : Jurnal Ekonomi dan Bisnis Jurnal TIKOMSIN (Teknologi Informasi dan Komunikasi Sinar Nusantara) Journal of Practical Computer Science (JPCS) Makara Journal of Technology Prosiding Seminar Nasional Teknik Sipil UMS Metalurgi Jurnal Pengabdian Masyarakat Ilmu Komputer Jurnal Pengabdian Masyarakat Teknologi dan Pendidikan (MANTAP) Journal of Information Technology, Computer Engineering and Artificial Intelligence (ITCEA)
Sri Harjanto
Departemen Metalurgi dan Material, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Religion Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Kajian Lalu Lintas pada Rencana Pembangunan Fly Over HOS Cokroaminoto Kabupaten Sragen Harjanto, Sri; Hidayati, Nurul; Harnaeni, Senja Rum
Prosiding Seminar Nasional Teknik Sipil UMS 2022: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (398.723 KB)

Abstract

Kabupaten Sragen mempunyai simpul-simpul transportasi jalan strategis yang menghubungkan kabupaten di Provinsi Jawa Tengah dengan Provinsi Jawa Timur, letaknya di perbatasan kedua propinsi tersebut. Salah satu ruas jalan utama di Kabupaten Sragen yang sering macet adalah Jalan HOS Cokroaminoto, Oleh karena itu Pemerintah Kabupaten Sragen berencana membangun fly over yang melintas di atas persimpangan tersebut. Meskipun demikian, fly over ini juga dapat memberikan dampak negatif antara lain kerusakan lingkungan, debu, berubahnya budaya gotong royong, mengurangi interaksi dan kegiatan sosial yang biasa dilakukan sebelum adanya fly over, sehingga perlu kajian yang lebih mendalam terkait karakteristik lalu lintas jaringan jalan saat ini, kinerja jaringan jalan tersebut saat ini dan kondisi jaringan jalan di atas jika di lokasi tersebut dibangun fly over, serta kondisi 5 tahun yang akan datang. Manfaat yang diharapkan dari penelitian ini antara lain, memberikan tambahan wacana dan referensi dalam mengatasi kemacetan lalu lintas dengan pembangunan fly over dan sebagai bahan acuan Pemerintah Kabupaten Sragen dalam membuat kebijakan dan peraturan daerah terkait pembangunan infrastruktur jalan. Jaringan jalan yang ditinjau adalah Jalan HOS Cokroaminoto, Jalan Sultan Agung, Jalan Diponegoro, Jalan Asem dan Jalan Tentara Pelajar, Karakteristik lalu lintas yang ditinjau adalah volume lalu lintas dan kecepatan arus, parameter kinerja jaringan yang ditinjau berupa kapasitas jalan, derajat kejenuhan dan LOS jalan. Fly over diasumsikan terbangun dalam rentang waktu 5 tahun yang akan datang. Jenis penelitian menggunakan metode deskriptif dan kuantitatif karena peneltian ini bersifat factual berdasarkan data yang ada untuk memecahkan masalah yang terjadi pada ruas jalan Hos Cokroaminoto. Data primer didapat dari dari pengamatan langsung di lapangan selama 2 hari ( Senin dan Sabtu). Tipe jalan yang diteliti adalah jalan perkotaan dengan dua lajur – dua arah (2/2 UD). Metode analisis menggunakan MKJI 1997. Hasil analisa kinerja ruas jalan Hos Cokroaminoto didapatkan nilai derajat kejenuhan (DS) kondisi eksisting sebesar 0,61 total dua arah. Untuk kinerja ruas jalan Hos Cokroaminoto pada 5 tahun mendatang sesuai dengan standart MKJI 1997 didadaptkan nilai derajat kejenuhan (DS) pada kondisi ruas jalan eksisting meningkat menjadi 0,78 hasil tersebut menunjukan nilai derajat kejenuhan (DS) telah melebihi ketetapan yang tertulis dalam MKJI 1997. Sesuai hasil analisa 5 tahun mendatang bahwa di ruas jalan Hos Cokroaminoto memang diperlukan pembangunan fly over sebagai salah satu cara untuk mengatasi permaslahan kemacetan jalan tersebut.
Self-Healing Behavior of Hydrothermally Engineered HAp/PAA Coatings on Magnesium Alloy WE43 Erryani, Aprilia; Rokhmanto, Fendy; Setyawan, Albertus Deny Heri; Thaha, Yudi Nugraha; Zakiyuddin, Ahmad; Kartika, Ika; Harjanto, Sri
Metalurgi Vol 39, No 3 (2024): Metalurgi Vol. 39 No. 3 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.780

Abstract

This work examines the self-healing properties and corrosion prevention mechanisms of hydrothermally synthesized HAp/PAA (hydroxyapatite/polyacrylic acid) composite coatings on magnesium alloy WE43. The coatings were produced with different PAA concentrations (0.15, 0.3, and 0.5 wt.%) by a hydrothermal method at 140 °C for 3 hours. The composite layers were analyzed using FTIR (fourier transform infrared spectroscopy), SEM (scanning electron microscopy), and EIS (electrochemical impedance spectroscopy) to assess their structural and electrochemical properties, as well as their self-healing capabilities via a scratch–immersion test in Hank’s solution at 37 °C for 48 hours. FTIR analysis confirmed the simultaneous presence of HAp and PAA phases without any chemical reaction, indicating physical contact through hydrogen bonding. The elevation of PAA concentration markedly affected coating morphology, resulting in denser and more uniform structures characterized by spherical HAp crystals at 0.5 wt.% PAA. SEM analysis following scratching and immersion demonstrated that the 0.5 wt.% PAA coating successfully preserved surface integrity and displayed partial restoration of the injured region via the reprecipitation of Ca–P compounds. The EIS findings indicated that the 0.5 wt.% PAA coating maintained the maximum impedance modulus (>10⁴ Ω·cm²) and a steady phase angle after 48 hours of immersion, therefore affirming its exceptional corrosion resistance and self-healing properties. The results demonstrate that an ideal PAA content fosters a dense, ion-responsive hybrid layer that effectively reinstates barrier characteristics following mechanical impairment. The hydrothermally produced 0.5 wt.% HAp/PAA coating offers an efficient self-healing and corrosion-resistant surface for WE43 magnesium alloy, indicating significant potential for use in next-generation biodegradable implant systems.
Corrosion Behavior of Equiatomic Bio-High Entropy Alloys CoCrMoMnNb Fabricated in Multiple Remelting Processes Rokhmanto, Fendy; Erryani, Aprilia; Setyawan, Albertus Deny Heri; Thaha, Yudi Nugraha; Zakiyuddin, Ahmad; Kartika, Ika; Harjanto, Sri
Metalurgi Vol 39, No 3 (2024): Metalurgi Vol. 39 No. 3 2024
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2024.782

Abstract

High-entropy alloys are described as equiatomic alloys of more than five elements or materials with five or more element constituents with a high mixing entropy (ΔSmix ≥ 1.5R), where the composition of the element is 5–35%, respectively. One application of HEA (high entropy alloys) materials is in the orthopedic field, where they are developed as biomaterials. Behavior, the correlation between the elemental distribution, and the microstructure of the material were investigated during multiple remelting processes known as Bio-HEAs. The development of Bio-HEAs is exciting in terms of design material, fabrication, and their properties. In this paper, the corrosion behavior and the correlation of the elemental distribution and the microstructure of the material were investigated during the multiple remelting process. The equiatomic CoCrMoMnNb was prepared in vacuum arc melting under an argon atmosphere and melted in a water-cooled copper mold. The total amount of ingot was approximately 25 grams, then flipped and remelted several times, 4, 8, and 12 cycles. The final composition of the alloys was confirmed by EDX (energy dispersive x-ray spectroscopy). The microstructure was investigated with an optical microscope and the SEM (scanning electron microscope). The corrosion parameter occurred in Hank’s solution at 37°C, at a scan rate of 1 mV/s. The CCM-MnNb fabricated with 8 cycles of the remelting process exhibits the lowest corrosion rate (0.0038 mmpy) and donor densities (2.67 × 10¹⁹ cm⁻³), while the charge transfer resistance number is the highest (18250.94 Ω cm⁻²). The outstanding corrosion resistance of the alloys is induced by the presence of the finer dendrites and the chromium oxide (Cr₂O₃) protective layer on the alloy's surface.
Aplikasi Sistem Pakar Pendeteksi Kerusakan Pada Mesin Bubut Menggunakan Metode Forward Chaining Harjanto, Sri; Pandhu Sudibya, Gilang; Kusumaningrum, Adriani
Journal of Information Technology, Computer Engineering and Artificial Intelligence (ITCEA) Vol. 3 No. 1 (2026): Journal of Information Technology, Computer Engineering and Artificial Intellig
Publisher : Redtech Putra Benua

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Abstract

A lathe machine is a tool capable of cutting metal into specific shapes, qualities, and dimensions as planned. Damage to a lathe machine is often difficult to identify and requires specialized handling; it typically needs to be transported to a workshop, which is both time-consuming and labor-intensive. Therefore, it is necessary to develop an expert system using the Forward Chaining algorithm to diagnose malfunctions in lathe machines. Forward Chaining is an inference method that initiates tracking by tracing data based on the facts of the observed symptoms. These symptoms are compared against standard rules and processed to generate solutions for the identified issues. The expert system is designed as a web-based application using the PHP programming language and a MySQL database. This system is intended to assist lathe machine operators and novice mechanics in identifying and addressing damages based on observed symptoms. Validation testing of this web-based expert system yielded a result of 83.3%, demonstrating its effectiveness in assisting users.
Co-Authors Abidin, Faizinal Agus Sukarto Wismogroho, Agus Sukarto Agustiningsih, Yuliana Ahmad Zakiyuddin Akhmad Herman Yuwono Amal, Muhamad Ikhlasul Andriyah, Lia Andriyah, Lia Arbi Dimyati Ari Wibowo Bambang Suharno Bustanul Arifin Duroriyatul Aulya, Duroriyatul Eko Sulistiyono, Eko Eny Kusrini Erryani, Aprilia Firdiyono, Firdiyono Florentinus Firdiyono Hakim, Rifaldi Ali Hanny Hafiar Heru Sulistiyo, Heru Ika Kartika Irawan, Januar Kawigraha, Aji Kusumaningrum, Adriani Lalasari, Latifa Hanum Lalasari, Latifa Hanum Marzuki Silalahi Muslimin Muslimin N, Elfi Natasha, Nadia Chrisayu Nofrijon Sofyan, Nofrijon Noor Salim Noviyanto, Alfian Nurhayati, Neni Octapiani Nurul Hidayati Nurul Taufiqu Rochman P, Nur Vita Pandhu Sudibya, Gilang Pudji Untoro Raharja, Bayu Dwi Raharjo Raharjo Raharjo, R Retno Tri Vulandari Rokhmanto, Fendy Sefriani, Eka Widya Senja Rum Harnaeni Setiyowati Setyawan, Albertus Deny Heri Sri Siswanti Suharyanto, Ariyo Sulistiyowati, Arini Sutono -, Sutono Teguh Susyanto Thaha, Yudi Nugraha Tri Arini, Tri Tri Irawati, Tri Tri Vulandari, Retno Wahyu Bambang Widayatno, Wahyu Bambang Waskitho, Anggit Widhi Wijayanto, Hendro Winarti HS, Endah Yunita, Fariza Eka