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All Journal Science and Technology Indonesia Journal of Science and Applicative Technology Metal Indonesia Indonesian Physical Review Perwira Journal of Community Development (PJCD) J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin
Hadi Teguh Yudistira, Hadi Teguh
Program Studi Teknik Mesin, Institut Teknologi Sumatera (ITERA)
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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Analisis Struktur Mikro dan Kekuatan Aus Rel Kereta Api Tipe R54 Divre IV Tanjung Karang Eko Pujiyulianto; Fajar Paundra; Jukepri Brain Meliala; Hadi Teguh Yudistira; Amelia Oktavia; M. Fahan Sidik; M. Rafi Kurniawan; Fuad Mulkan Al Machzumy
Jurnal Metal Indonesia Vol 44, No 2 (2022): Metal Indonesia
Publisher : Balai Besar Logam dan Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32423/jmi.2022.v44.67-74

Abstract

Penelitian ini bertujuan untuk menganalisa struktur mikro dan ketahanan aus material rel R54 yang telah digunakan di divre IV tanjung karang. Beberapa pengujian yang dilakukan adalah pengujian komposisi kimia pada bagian kepala dan bagian badan dengan menggunakan spektrometri, pengujian struktur mikro dengan menggunakan mikroskop optik, dan pengujian keausan dengan metode Ogoshi. Hasil penelitian menunjukan bahwa bagian kepala dan bagian badan memiliki komposisi kimia yang sama dimana unsur paduan utamanya adalah C, Si, Mn. Unsur Cr ditemukan pada material R54 yang dianalisis. Hasil pengujian struktur mikro menunjukan bahwa fasa yang terbentuk adalah perlit dimana pada bagian kepala berbentuk perlit halus dan pada bagian badan dan kaki berbentuk perlit kasar. Retakan ditemukan pada permukaan rel. hasil pengujian aus menunjukan bahwa nilai keausan spesifik material rel R54 adalah 1,606 x 10-8 mm2/kg.
Simulation of Electric Field Distribution on Meniscus of Electrospray with Zinc Oxide Material Andam Deatama Refino; Hadi Teguh Yudistira; Denny Hidayat Tri Nugroho; Deska Lismawenning
Journal of Science and Applicative Technology Vol 2 No 1 (2019): ICoSITeR Special Edition
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (377.718 KB) | DOI: 10.35472/281463

Abstract

Electrospray system had attracted attention of many researchers. It is due to easy to yield uniform thin film and possible for thin film mass production. The important parameters of electrospray process for getting uniform thin film are electric field distribution, surface substrate treatment and solvent properties. In this work, we observed electric field distribution on meniscus. Numerical work has carried out on this work. The material on meniscus used zinc oxide liquid properties. Voltage and walking distance between nozzle and substrate are the most important parameter to adjust electric field distribution. The decreasing walking distance with constant voltage yields increasing electric field distribution on meniscus. On vice versa, the increasing walking distance yields decreasing electric field distribution on meniscus. Increasing and decreasing voltage yields increasing and decreasing electric field distribution on meniscus, respectively.
Numerical Investigation of Electrospray Working Performance on Ethanol Andam Refino; Hadi Teguh Yudistira; Denny H. T. Nugroho; Deska L. Puspitarum
Journal of Science and Applicative Technology Vol 3 No 2 (2019): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1338.918 KB) | DOI: 10.35472/jsat.v3i2.196

Abstract

Electrospray as an alternative method to fabricate thin film is studied. High voltage is required by the electrospray system. The requirement of high voltage is different for various liquid depending on the surface tension property. Ethanol was used to resemble the solvent used in thin film deposition. From the experimental work, jetting performance did not occur despite of the high applied voltage which is around 1 KV. In this work, numerical calculation is carried out to find the reason behind of unsuccessful jetting at 1 KV applied voltage. The percentage of Rayleigh limit is around 0.4. Electrospray performance at walking distance 5 mm using ethanol is predicted to be stable when the applied high voltage is approximately 1.1 KV. The numerical investigation indicates that the jetting performance will occur if the applied voltage is more than 1.1 KV.
PENGGUNAAN METODE FINITE DIFFERENCE TIME DOMAIN (FDTD) DALAM SIMULASI PHASED ARRAY ANTENNA Hadi Teguh Yudistira
Journal of Science and Applicative Technology Vol 1 No 1 (2017): Journal of Science and Applicative Technology August Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1570.98 KB) | DOI: 10.35472/281436

Abstract

Finite Diffrence Time Domain merupakan metode simulasi yang digunakan dalam simulasi gelombang elektromagnetik dimana mengunakan prinsip dasar pendekatan numerik dari persamaan differensial dalam domain ruang dan waktu. Phased array antenna merupakan salah satu jenis antenna yang dapat diaplikasikan pada automotive radar. Phased array antenna yang disimulasikan terdiri dari microstrip antenna dengan jumlah 64 antenna ( 8 baris, 8 kolom). Microstrip antenna terdiri dari 3 bagian yaitu patch, substrate dan ground. Ukuran patch pada microstrip antenna adalah 1.2 x 2.6 mm. Permitivitas relatif substrate yang digunakan adalah 10.2. Hasil yang diperoleh dari simulasi ini adalah pola radiasi dari phased array antenna berbentuk directional.
Electrospun Rare-Earth Metal Oxide (CeO2 ) Nanofiber for the Degradation of Congo Red Aqueous Dyes Rianjanu, Aditya; Haloho, Trivendi; Pasaribu, Joshua Leonardo; Fahmi, Achmad Gus; Nurfani , Eka; Sipahutar, Wahyu Solafide; Yudistira, Hadi Teguh; Taher, Tarmizi
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.123-130

Abstract

The persistent presence of organic dyes like Congo Red (CR) in wastewater poses a significant environmental challenge. In this study, CeO2 nanofibers (CeO2-NF) were successfully synthesized via electrospinning followed by calcination as potential photocatalysts for the degradation of CR pollutants in aqueous solutions. The synthesized nanofibers were characterized using field emission scanning electron microscopy coupled with energy dispersive X-Ray Spectroscopy (FESEM-EDS) for morphological and elemental analyses, X-Ray Diffraction (XRD) for crystalline structure, and Fourier transform infrared (FTIR) spectroscopy for molecular properties. Photocatalytic degradation experiments were conducted under UVC light irradiation, with the CeO2-NF1, CeO2-NF2, and CeO2-NF3 samples achieving CR degradation percentages of 95.6%, 96.9%, and 95.2%, respectively, after 130 minutes of reaction time. Kinetic analysis revealed that the photocatalytic degradation followed pseudo-first-order kinetics, with rate constants of 0.020 min-1, 0.024 min-1, and 0.025 min-1 for CeO2-NF1, CeO2-NF2, and CeO2-NF3, respectively, highlighting the superior performance of CeO2-NF3. These results indicate that CeO2NF could serve as an effective material for the photocatalytic degradation of organic dyes, offering a promising approach for wastewater treatment applications.
ANALYSIS OF LINES FORMATION PRODUCED BY ELECTROHYDRODYNAMIC JET PRINTING FOR TERAHERTZ (THZ) METAMATERIALS FABRICATION Tenggara, Ayodya Pradhipta; Yudistira, Hadi Teguh; Mtei, Brian Godwin; Byun, Doyoung
Indonesian Physical Review Vol. 8 No. 2 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i2.433

Abstract

Electrohydrodynamic (EHD) jet printing has revolutionized semiconductor manufacturing technologies to fabricate high resolution materials pattens (metal, dielectric, or semiconductors) in small size. This technology can reduce excessive materials usage in conventional semiconductor lithographic technologies, such as photolithography or electron beam lithography, so that it can be categorized as a green manufacturing technology. EHD jet printing has a capability to fabricate resonant terahertz metamaterial. Resonant terahertz metamaterial contains metal structures in micrometer sizes patterned on dielectric substrate. The metal structures are arranged periodically to generate resonances in specific frequencies, which are beneficial for several applications, such as biosensing, chemical sensing, and terahertz optical modulators for future communication devices. To make a high resolution and repeatable structures, EHD jet printing faces two main problems, i.e. the drop coalescence problem and the charge problem. The charging problem can be solved by removal of substrate charges using ionizer. However, the drop coalescence problem is a type of complex problem that needs to be studied and optimized systematically to produce repeatable and reliable terahertz resonant metamaterial structures, which is electric split ring resonator (ESRR). The objective of this research is to investigate to the formation stability of dots and lines produced by the EHD jet printing. We used EHD jet printing through the Drop on Demand (DoD) method to deposit droplets from metal nanoparticle ink with various volumes on dielectric substrates with different thickness. Several parameters were investigated, i.e. the droplet volume, the droplet spacing, and the substrate thickness. The results showed that by increasing the deposited droplet volumes and decreasing the substrate thickness, the stability of line formation was improved. Moreover, the stability analysis of line formation revealed that by using the bigger volume, the minimum printing speed to make uniform line was decreased, because the bigger droplet volume gave smaller contact angle. The results also showed that the uniformity of metamaterials patterns could be improved by using the smaller width.
Analisis Pengaruh Temperatur Terhadap Kekuatan Tarik dan Tekuk pada Proses Hot Pressing Komposit Hybrid Serat Bambu dan Serat Daun Nanas Bermatriks HDPE Paundra, Fajar; Pratama, Angga Jihan; Pujiyulianto, Eko; Muhyi, Abdul; Yudistira, Hadi Teguh; Maulana, Sena; Elmiawan, Puguh
J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Vol. 8 No. 2 (2024): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v8i2.1123

Abstract

Temperatur merupakan salah satu parameter yang sangat berpengaruh terhadap komposit HDPE. Penelitian ini bertujuan mengamati dan menganalisis pengaruh temperatur terhadap kekuatan tarik dan tekuk pada proses hot pressing komposit hybrid serat bambu dan serat daun nanas bermatriks HDPE. Material yang digunakan yaitu plastik HDPE, serat bambu dan serat daun nanas. Proses pembuatan dengan metode hot pressing bertekanan 25 bar dengan variasi temperatur 170°C, 180°C, 190°C, 200°C, dan 210°C selama holding time 25 menit. Pengujian yang dilakukan pada penelitian ini adalah pengujian tarik dan pengujian tekuk yang merujuk pada standar ASTM D 3039 dan ASTM D 790. Nilai kekuatan tarik maksimal komposit HDPE tertinggi terdapat pada temperatur 170°C dengan nilai sebesar 514,489 MPa dan nilai kekuatan tarik maksimal terendah terdapat pada temperatur 210°C dengan nilai sebesar 383,349 MPa. Nilai kekuatan tekuk maksimal tertinggi juga terdapat pada temperatur 170°C dengan nilai sebesar 97,322 MPa dan nilai kekuatan tekuk terendah terdapat pada temperatur 210°C dengan nilai sebesar 74,081 MPa.
PEMBEKALAN DAN SOSIALISASI PENTINGNYA PENDIDIKAN TINGGI BAGI SISWA SMK NEGERI GADINGREJO PRINGSEWU Paundra, Fajar; Alfian, Devia Gahana Cindi; Muhyi, Abdul; Yudistira, Hadi Teguh
Perwira Journal of Community Development Vol 4 No 2 (2024)
Publisher : Unperba Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54199/pjcd.v4i2.311

Abstract

Program Studi Teknik Mesin ITERA mengembangkan disiplin berbasis cabang ilmu teknik mesin yang didefinisikan sebagai ilmu teknik yang mempelajari perancangan, produksi/pembuatan dan operasi mesin. Kunjungan siswa-siswi SMKN 1 Gadingerjo ke kampus merupakan salah satu upaya yang penting dalam memperkenalkan dan mempersiapkan mereka untuk pengalaman pendidikan tinggi. Dalam beberapa kasus, kunjungan siswa ke kampus juga dapat menjadi bagian dari program orientasi atau rekrutmen mahasiswa baru. Hal ini memungkinkan siswa untuk memperoleh pemahaman yang lebih baik tentang persyaratan pendaftaran, proses seleksi, dan tata cara mengajukan aplikasi. Kunjungan dimulai dari Penerimaan Siswa Siswi SMKN1 Gadingrejo di Gedung Kuliah umum yang dilanjutkan dengan sesi diskusi. Selanjutnya kunjungan Laboratorium teknik mesin sebagai sarana pembelajaran kepada para siswa. Dengan demikian, kesimpulan dari sosialisasi program studi Teknik Mesin kepada SMKN1 Gadingrejo adalah bahwa kegiatan ini memiliki dampak positif dalam memberikan informasi, kesempatan, dan motivasi bagi siswa untuk mempertimbangkan dan memilih pendidikan tinggi di bidang teknik mesin sebagai langkah awal menuju karir yang sukses dan memuaskan.
Co-Authors Amelia Oktavia Andam Deatama Refino Andam Refino Byun, Doyoung Denny H. T. Nugroho Denny Hidayat Tri Nugroho Deska L. Puspitarum Deska Lismawenning Devia Gahana Cindi Alfian Eka Nurfani Eko Pujiyulianto Elmiawan, Puguh Fahmi, Achmad Gus Fajar Paundra Fuad Mulkan Al Machzumy Haloho, Trivendi Jukepri Brain Meliala M. Fahan Sidik M. Rafi Kurniawan Maulana, Sena Mtei, Brian Godwin Muhyi, Abdul Pasaribu, Joshua Leonardo Paundra, Fajar Pratama, Angga Jihan Pujiyulianto, Eko Rianjanu, Aditya Sipahutar, Wahyu Solafide Tarmizi Taher Tenggara, Ayodya Pradhipta