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All Journal Jurnal Teknik ITS The Journal of Experimental Life Sciences (JELS) IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science Journal of Engineering and Technological Sciences International Conference on Coastal and Delta Areas Squalen Bulletin of Marine and Fisheries Postharvest and Biotechnology Adi Widya : Jurnal Pengabdian Masyarakat IJOCE (International Journal of Offshore and Coastal Engineering) Jurnal Purifikasi International Journal of Marine Engineering Innovation and Research Jurnal Kadesi : Jurnal Teologi dan Pendidikan Agama Kristen Jurnal Pengabdian Pada Masyarakat Sewagati
Herman Pratikno, Herman
Institut Teknologi Sepuluh Nopember
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Analisis Pengaruh Suhu Material Pada Pengaplikasian Coating Epoxy Terhadap Kekuatan Adhesi Baja A36 Raymond Habinsaran Aruan; Herman Pratikno; Yoyok Setyo Hadiwidodo
Jurnal Teknik ITS Vol 12, No 1 (2023)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v12i1.110657

Abstract

Pada era modern ini, kebutuhan manusia terhadap material pada bidang kontruksi bangunan laut seperti pemilihan bahan untuk bidang perpipaan, konstruksi bangunan laut dan perkapalan. terdapat beberapa macam pilihan material yang sesuai.Korosi yang terjadi pada logam tidak dapat dihindari, tetapi hanya dapat dicegah dan dikendalikan sehingga logam mempunyai masa pakai atau guna lebih lama. Pemberian lapisan coating anti korosi merupakan salah satu untuk melindungi material dari proses korosi. Pada penelitian ini, dilakukan pengujian kekuatan adhesi dan pengujian laju korosi pada Epoxy Coating pada baja ASTM A36 yang divariasikan dengan mengubah suhu material spesimen. Hal ini dilakukan untuk mengetahui hasil kualitas coating yang dilakukan masih memenuhi standar dengan dilakukan variasi suhu spesimen. Dari pengujian adhesi yang telah dilakukan didapatkan hasil bahwa suhu spesimen 500 C mempunyai hasil yang paling baik. Pada pengujian dengan variasi suhu 500 C mendapatkan nilai kekuatan adhesi sebesar 8.81 Mpa.
Peningkatan Kompetensi Teknologi Informasi bagi Guru Sekolah Penggerak PKG Bunga Harapan Ngoro-Jombang untuk mendukung Pengembangan Pendidikan Daerah secara Berkelanjutan Rahmawati, Shade; Mukhtasor, Mukhtasor; Pratikto, Agoes; Ikhwani, Hasan; Wardhana, Wisnu; Zikra, Muhammad; Pratikno, Herman; Handayanu, Handayanu; Frestiqauli, Santi
Sewagati Vol 8 No 3 (2024)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v8i3.904

Abstract

Guru Penggerak sebagai salah satu komponen utama dalam Program Sekolah Penggerak dalam hal ini agar dapat memaksimalkan perannya, haruslah ditunjang dengan kompetensi yang dibutuhkan. Dalam kegiatan pengabdian masyarakat ini, objek difokuskan pada Guru untuk jenjang Pendidikan Anak Usia Dini (PAUD). Kondisi nyata menunjukkan bahwa Guru PAUD memiliki variasi yang beragam secara kualifikasi maupun kompetensi. Di sisi lain, Program Sekolah Penggerak menuntut adanya SDM yang kompeten untuk mengimplementasikan pembelajaran paradigma baru berbasis berbagai digital platform dengan tujuan untuk mengurangi kompleksitas, meningkatkan efisiensi, menambah inspirasi, dan pendekatan yang customized. Berkaca pada kebutuhan dan kondisi yang ada, maka diperlukan pelatihan dan pendampingan bagi Guru PAUD utamanya dalam Kompetensi Teknologi Infomasi dan Komunikasi (TIK). Pada laporan ini disampaikan pelaksanaan kegiatan pengabdian masyarakat yang berjudul “Peningkatan Kompetensi Teknologi Informasi bagi Guru Sekolah Penggerak untuk mendukung Pengembangan Pendidikan Daerah secara Berkelanjutan”, dengan lokasi kajian Desa Jombok, Kecamatan Ngoro, Kabupaten Jombang, Jawa Timur. Kegiatan utama dan penyiapan luaran dilaksanakan pada rentang waktu bulan Mei hingga September 2023.
Sinergi Koperasi Pondok Pesantren dalam Membangun Keberlanjutan Ekonomi melalui Kolaborasi Bisnis dan Manajemen Operasional Prasetyawan, Yudha; Suef, Mokhammad; Nugroho, Taufik Fajar; Sutikno; Pratikno, Herman; Yuwana, Lila; Warnana, Dwa Desa; Kusumaningrum, Ajeng Wardhani; Rahmaningtyas, Ivana; Naifah, Sonia Ratnaduhita Nurani; Handaningtyas, Inggrid; Wiscahyo, Gelar; Putra, Riyan Afnanda; Yani, Beta Fitri; Nabila, Debby Dea; Rashida, Ailsa Dahayu
Sewagati Vol 8 No 6 (2024)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v8i6.2238

Abstract

Program "One Pesantren One Product" (OPOP) bertujuan meningkatkan kesejahteraan pondok pesantren melalui pengembangan usaha berbasis ekonomi syariah. Masalah dihadapi dalam pelaksanaan program terkait keberlanjutan dan efisiensi yang belum teratasi, terutama dalam hal pemetaan bisnis yang komprehensif serta kurangnya kolaborasi antar pesantren. Pengabdian masyarakat ini hadir sebagai solusi melalui serangkaian pelatihan dan konsultasi yang berfokus pada manajemen bisnis, kolaborasi, serta pemetaan potensi usaha pada koperasi pondok pesantren (kopontren). Kegiatan dimulai dengan identifikasi masalah melalui Focus Group Discussion (FGD) untuk merumuskan kompetensi pengelola koperasi pondok pesantren dan survei potensi bisnis. Pelatihan intensif dilakukan untuk meningkatkan kompetensi manajemen dan operasional kopontren, diakhiri dengan sesi pitching ide bisnis. Hasil akhir dari pelatihan menunjukkan bahwa 86,17% peserta puas dengan materi yang disampaikan dan 85,8% peserta paham akan materi yang telah disampaikan dapat mencerminkan keberhasilan program ini dalam meningkatkan kapasitas pesantren. Dengan demikian, program ini diharapkan mampu menjadi model pemberdayaan ekonomi pesantren yang berkelanjutan dan berdaya saing, serta diharapkan dapat meningkatkan kemandirian ekonomi pesantren dan berpotensi diadaptasi di wilayah lain.
Potency of Coconut Shell Biochar to Remediate Ion Chromium in Contaminated Water Faris, Salman; Titah, Harmin Sulistiyaning; Pratikno, Herman
The Journal of Experimental Life Science Vol. 13 No. 3 (2023)
Publisher : Graduate School, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jels.2023.013.03.08

Abstract

Many heavy metals contaminate our environment, including chromium (Cr(VI) contaminated water. The aim of this study was to determine the removal of ion Cr(VI) using the coconut shell biochar. Biochar activation processes were conducted at 350℃ and 550℃. The characteristic tests of biochar were conducted, such as testing for moisture, ash, volatile, and carbon content. Additionally, a scanning electron microscope was also performed. The remediation test was carried out on a laboratory scale with a batch system. The variables were the mass of coconut shell biochar (0, 8, and 16 r) and the time of process were 0, 30, and 60 min. Based on the results, the characteristics of coconut shell biochar showed a high carbon content, which reaches 80.4% for activation temperature at 500℃ and 73.02% for 350℃. Coconut shell biochar can reduce ion Cr(VI) in water; it reached 73.78% to 88.15%. The percentage of Cr(VI) reduction in water reached 88.15% using biochar that was activated at a temperature of 350℃ and a mass of 16 g at a detention time of 60 min. In conclusion, coconut shell biochar has good potential to reduce chromium in water. Keywords: Biochar, Chromium, Coconut Shells, Remediation.
The Effect of Aeration and Chlorella vulgaris Initial Cell Density on Mercury Removal Dienullah, R Mohammad Alghaf; Titah, Harmin Sulistiyaning; Pratikno, Herman; Purwanti, Ipung Fitri; Wardhani, Widhowati Kesoema
Squalen, Buletin Pascapanen dan Bioteknologi Kelautan dan Perikanan Vol 20, No 1 (2025): May 2025
Publisher : :Agency for Marine and Fisheries Research and Human Resources, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/squalen.921

Abstract

Research on Chlorella vulgaris is vital due to its rapid growth and versatile habitat adaptability. C. vulgaris is a fast-growing green microalga used for phycoremediation of heavy metals such as mercury which is usually found in gold mining wastewater. This research aims to determine the best mercury removal efficiency with variations in aeration rate, medium concentration, and C. vulgaris inoculum concentration. This research was conducted by cultivating C. vulgaris and examining its response to various parameters in an artificial mercury (II) chloride (HgCl2) solution. Moreover, other parameters such as cell density, pH, temperature, bicarbonate, and dissolved oxygen were monitored over a seven-day experimental period. The highest removal efficiency (61.34%) at a mercury concentration of 0.3 mg/L was found in the variant with a walne medium dose of 1 mL/L, inoculum concentration of 10%, and aeration rate of 3 L/min. This study confirmed the potential of C. vulgaris as an effective agent for heavy metal removal, particularly mercury, and contributed to bioremediation.
The Analysis of Electrode Combination Effect on Steel and Stainless Steel Welding (Overview of Tensile and Metallography Test) Hasan Ikhwani; Faruq Abdullah; Herman Pratikno
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 1 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i1.5043

Abstract

The process of building a ship or offshore structure, proper and accurate planning and implementation is required. In the development process, it will go through a stage, namely the construction stage. At the construction stage, the construction of a ship or offshore building will go through a welding phase which functions as a connection of materials to one another. Low carbon steel and stainless steel are materials that are often used in the construction process of ships or offshore structures. In this study, an analysis of the effect of the combination of electrodes on the welding of steel and stainless steel materials was carried out in terms of mechanical properties such as tensile strength, bending strength and metallographic shape. The materials used in this study were A36 steel and 304 stainless steel, while the electrode combinations used were E308L and E309 electrodes. Welding variations used in this study were a combination of E308L (root) and E309 (filler) electrodes, a combination of E308L (filler) and E309 (root) electrodes, E309 electrodes, and E308L electrodes. In the tensile test results it was found that the highest tensile strength value occurred in Specimen 4 with an average value of yield strength and ultimate strength of 389.54 MPa and 522.52 MPa. The tensile strength value is influenced by the amount of chromium contained in the electrode. This is because the higher the amount of chromium causes the amount of ferrite in the material to increase so that the tensile strength value decreases. In the metallographic macro testing results, the best weld profile results were obtained on specimens with the ME 4 material code because the results of the weld profile shape best met ASME Section IX standards. The results of micro metallographic testing showed that welding using the dominant E308L electrode as in Specimen 1 and Specimen 4 obtained a higher ultimate strength value compared to Specimen 2 and Specimen 3. This was due to the influence of chromium on the electrodes used, high chromium causing the formation of a ferrite phase in the microstructure of the material.
Burst Pressure Assessment of Corroded Steel Pipeline Using DNV-RP-F101 and Finite Element Method with Circumferential Defect Interaction Study Yoyok Setyo Hadiwidodo; Asta Razqi Damarjati; Herman Pratikno
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v10i1.9918

Abstract

Metal loss corrosion is one of the primary degradation mechanisms in steel pipelines in the oil and gas industry. Wall thickness reduction due to corrosion increases hoop stress and reduces the maximum pressure capacity of the pipeline, potentially leading to bursting failure. This study aims to analyze the bursting pressure of corroded steel pipelines using two approaches: the analytical method based on DNV-RP-F101 and the numerical method using the Finite Element Method (FEM) through ANSYS software. The parameters investigated include the defect depth ratio (d/t) and the circumferential spacing between defects. A three-dimensional numerical model was developed considering elastic-plastic material behavior. The results indicate that an increase in defect depth ratio has a dominant effect in reducing bursting pressure, while closer defect spacing intensifies stress interaction and accelerates local plastification. A comparison between DNV-RP-F101 and FEM shows deviations within acceptable engineering tolerance; however, FEM predicts lower failure pressure as it captures stress concentration and plastic distribution in greater detail.
Effect of Heat Treatment and Types of Bacteria on Corrosion Resistance At Steel Materials (API 5L and ASTM A53) in the Marine Environment Herman Pratikno; Harmin Sulistyaning Titah; Febrian Ramadhana Sastradimaja
International Journal of Offshore and Coastal Engineering Vol. 1 No. 1 (2017)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v1i1.2876

Abstract

Corrosion is the result of damage to material degradation through a chemical or electrochemical reaction spontaneously and causes a decrease in the quality of the material. One of the causes of corrosion is the presence of bacteria on the material. The danger posed by corrosion is fatality, especially on offshore platforms, namely cessation of production at offshore rigs. This study is an experiment using material carbon steel API 5L Grade B and ASTM A53 commonly used as a base for the manufacture of subsea pipelines. Material to be heat-treated before immersion for corrosion test in artificial seawater (salinity 35‰), which have been added with bacteria and without bacteria. The method used in measuring the rate of corrosion steel data is the weight loss. The highest corrosion rate of the original material ASTM A53 and API 5L with the addition of T. ferrooxidans bacteria are, respectively, 3.63 mpy and 3.50 mpy. While the lowest corrosion rate of ASTM A53 and API 5L both with heat treatment but without adding bacteria are 2.33 mpy and 2.01 mpy. This indicates that the steel API 5L have high levels of corrosion resistance, better than ASTM A53 in the marine environment with bacteria or without bacteria.
Analitical Study of Vertical and Lateral Buckling on Pipeline Using Hobbs Method Yoyok Setyo Hadiwidodo; Herman Pratikno; Muhammad Makki Romadhoni
International Journal of Offshore and Coastal Engineering Vol. 1 No. 2 (2017)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v1i2.7058

Abstract

Influence of Pre-Weld Heat Treatment and Aging Post-Weld Heat Treatment on Tensile Test and Microstructure of Aluminium 6061 Weld Joint Herman Pratikno; Hasan Ikhwani; Tin Rachmatullah
International Journal of Offshore and Coastal Engineering Vol. 4 No. 1 (2020)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i1.8701

Abstract

Aluminium 6061 is an aluminium composition with Al-Mg-Si alloy which is often used for offshore structure material due to its high strength, good ductility and good corrosion resistance as well as its mechanical properties that can be enhanced by heat treatment. The purpose of this paper is to show the effect of heat treatment variations, in the form of preheating and aging PWHT, on tensile strength and microstructure of aluminium 6061 welding connection with GTAW process using electrode ER 5356. The pre-heat temperature variations used were 80°C, 100°C, and 120°C and the aging PWHT temperature variations used were 180°C and 260°c. The result shows that specimen with preheat treatment temperature of 120°C and aging pwht temperature of 260°C had the largest ultimate strength of 246.74 MPa and yield strength of 125.21 MPa. The highest percentage of Mg2Si formed was also found on the same specimen with a percentage of 48.84% in weld metal, 58.75% in HAZ, and 43.54% in base metal.
Co-Authors Abdullah Husin Baredwan Agung Purniawan Andrea Novia Samiyono Andry Febrianto Ardi Prasetia Yanuar Arifin Amanto Putra Asta Razqi Damarjati Atha Fazadima Atiek Moesriati Atiek Moesriati Bayu Mahardika Bima Satriya Willy Harsa Bintang Respati Dwi Harnani Carolus Trijatmiko Nugroho Dienullah, R Mohammad Alghaf Dirta Marina Chamelia Dwa Desa Warnana Dwi Maharani Aisyah Dwi Purnomo H, Zuhud Ubaidillah & Miftakh D.S Faruq Abdullah Febrian Ramadhana Sastradimaja Felita Widya Hapsari Frestiqauli, Santi Gilang Rezha Mahardika Hafizh Abiyyuda Hafizh Abiyyuda Handaningtyas, Inggrid Handayanu Handayanu Handayanu Handayanu Harmin Sulistyaning Titah Harmin Sulistyaning Titah Hasan Ikhwani Hasan Ikhwani Hasan Ikhwani Hasan Ikhwani Ikhwani, Hasan Inastika Nabilah Inaya Krista Pradyptia Ipung Fitri Purwanti Kusumaningrum, Ajeng Wardhani Lila Yuwana Madi Madi Madi Mahmud Mustain Mahmud Mustain Maria Anityasari Miftakh D.S, Dwi Purnomo H, Zuhud Ubaidillah & Moch. Zaed Yuliadi Muhammad Fauzul Imron Muhammad Ichsan Rosidin Yuniarto Muhammad Makki Romadhoni muhammad Rizkqy Jafa Muhammad Rizqy Jafa Muhammad Sultanul Azdkar Muhammad Zikra Mukhtasor Mukhtasor Nabila, Debby Dea Naifah, Sonia Ratnaduhita Nurani Nugraha Adhi Pahlawan Nur Syahroni Pandu Damay Putra Pratikto, Agoes Putera, Rizky Islami Putra, Riyan Afnanda Rahmadhani Tasya Rahman Rahmaningtyas, Ivana Rashida, Ailsa Dahayu Ray Adam Baihaqi Raymond Danielle Mulya Raymond Habinsaran Aruan Rizkiyah Ramadani Rizky Islami Putera Rizky Islami Putera Rochani, Imam Rudi Walujo Prastianto Rudi Walujo Prastianto Safira Dwi Anggraeni SALMAN FARIS Shade Rahmawati Sholihin Sholihin Sholihin Suef, Mokhammad Suparno Suparno SUTIKNO Taufik Fajar Nugroho Tin Rachmatullah Tin Rachmatullah Titah, Harmin Sulistiyaning Titah, Harmin Sulistiyaning Wardhani, Widhowati Kesoema Wimala Lalitya Dhanista Wimala Lalitya Dhanista Wimala Lalitya Dhanistha Wimala Lalitya Dhanistha Wiscahyo, Gelar Wisnu Wardhana Yani, Beta Fitri Yoyok Setyo H Yoyok Setyo Hadiwidodo Yoyok Setyo Hadiwidodo Yudha Prasetyawan Yudha Prasetyawan Yudiardana Tridantoko Susarno