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All Journal KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Factum: Jurnal Sejarah dan Pendidikan Sejarah International Journal of Education Jurnal Cita Hukum IJEE (Indonesian Journal of English Education) Jurnal Penelitian Karet JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING CIRCUIT: Jurnal Ilmiah Pendidikan Teknik Elektro Martabe : Jurnal Pengabdian Kepada Masyarakat Jurnal Ilmiah Administrasita' Jurnal Basicedu Jesya (Jurnal Ekonomi dan Ekonomi Syariah) EDUKATIF : JURNAL ILMU PENDIDIKAN Jurnal Ilmiah Akuntansi dan Keuangan Jurnal Onoma: Pendidikan, Bahasa, dan Sastra Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Journal of Welding Technology Jurnal Educatio FKIP UNMA utile: Jurnal Kependidikan Abdi Laksana : Jurnal Pengabdian Kepada Masyarakat Budimas : Jurnal Pengabdian Masyarakat Insan Cita Jurnal Pengabdian Kepada Masyarakat Al Qisthi: Jurnal Sosial dan Politik Journal Coaching Education Sports JURNAL ABDIMAS TRIDHARMA MANAJEMEN Jurnal Kesehatan Tambusai Jurnal Pengabdian dan Peningkatan Mutu Masyarakat (JANAYU) Al-Qisthi: Jurnal Sosial dan Politik Jurnal Riset dan Inovasi Pembelajaran Journal of English Language and Education Jurnal Olahraga dan Kesehatan Indonesia (JOKI) Jurnal Ekonomi dan Manajemen Indonesia Jurnal Pengabdian Kepada Masyarakat Abdi Nusa Journal of Mechanical Engineering, Science, and Innovation Journal of Government Insight PENGABDIAN SOSIAL Jurnal Ilmu Hukum, Humaniora dan Politik (JIHHP) Edukasiana: Jurnal Inovasi Pendidikan Jurnal Basicedu Governors JAQ Cerdika: Jurnal Ilmiah Indonesia Indonesian Journal of Physical Activity Surya : Jurnal Pengabdian Kepada Masyarakat Jurnal Teknologi Maritim JPFT (Jurnal Pendidikan Fisika Tadulako Online) Visioner : Jurnal Manajemen dan Bisnis JOURNAL SPORTINDO Journal of Selvicoltura Asean
Bachtiar Bachtiar
Nursing Department, Polytechnic Health Ministry of Semarang
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Analysis of Tube Expansion Percentage on Microstructure and Hardness of 316L Stainless Steel Tube-to-Tubesheet Connections with GTAW Process Syaiful Amri, Moh.; Bachtiar, Bachtiar; Miftachul Munir, Moh.; Mukhlis, Mukhlis; Ari, Muhammad; Kurniawan, Ilham
Journal of Mechanical Engineering, Science, and Innovation Vol 5, No 2 (2025): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2025.v5i2.8161

Abstract

This study analyzes the effect of varying tube expansion percentages on the mechanical properties, microstructure, and hardness of SA-213 TP316L tubes joined to SA-240 TP316L tubesheets in a shell-and-tube type heat exchanger. The tube expansion process was carried out using a roller expander with three expansion levels: 4%, 8%, and 12%, followed by Gas Tungsten Arc Welding (GTAW) at 150 A. Microstructural observations revealed that all joint zones were dominated by austenite with small amounts of delta ferrite, where increasing expansion percentages induced significant changes in the expand area: slight deformation at 4%, grain elongation at 8%, and pronounced grain distortion at 12%. Macrostructural observations showed perfect fusion between the tube and tubesheet for all variations, with no macro defects such as lack of fusion or porosity. Vickers hardness testing indicated the highest values in the expand area for all variations, with a maximum of 377 Kgf/mm², exceeding the standard limit of 250 Kgf/mm² for stainless steel. The hardness of the base metal was around 180 Kgf/mm², while the weld metal ranged from 220–230 Kgf/mm² due to delta ferrite formation. The increase in hardness in the expand area was attributed to cold working effects, indicating that post-tube expansion heat treatment is necessary to reduce residual stresses and restore the optimal mechanical properties of the material.
Analysis of the Best Neural Network Configuration for Predicting Household Customer Kwh Sales in Banda Aceh City Bachtiar, Bachtiar; Tarmizi, Tarmizi; Adriman, Ramzi
Circuit: Jurnal Ilmiah Pendidikan Teknik Elektro Vol. 8 No. 2 (2024)
Publisher : PTE FTK UIN Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/crc.v8i2.22017

Abstract

Energy consumption (kWh) is critical to the operation of electrical systems. Predictive modeling optimizes energy usage, increasing power system efficiency. This study created an artificial neural network (ANN) architecture to estimate energy consumption (kWh) for home users in Banda Aceh. The ANN topology consisted of 5 input layers, 5-25 hidden layers, and one output layer. This study used two scenarios: first, the ANN topology was trained using the logsig activation function, and then the tansig activation function was used for training. Based on training simulations, the ANN architecture with 5 input layers, 5 hidden layers, and 1 output layer has the lowest Mean Squared Error (MSE) of 0.00035. The next phase involved testing this ANN topology. The next stage is to analyze the ANN architecture with 5 input layers, 5 hidden layers, and 1 output layer using the testing technique. Based on the testing technique, the ANN architecture with 5 input layers, 5 hidden layers, and 1 output layer had a MAPE value of 3.34%.
TECHNOLOGY INTEGRATION IN LEARNING IN THE 21ST CENTURY EFL CLASSROOM IN INDONESIA Bachtiar, Bachtiar; Juhana, Juhana; Zuhairi, Aminudin; Ardiasih, Lidwina Sri; Puspitasari, Maya; Pratiwi, Widya Rizky
BUDIMAS : JURNAL PENGABDIAN MASYARAKAT Vol. 6 No. 1 (2024): BUDIMAS : Jurnal Pengabdian Masyarakat
Publisher : LPPM ITB AAS Indonesia Surakarta

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Abstract

This paper reports the outcomes of a ‘Community Service’ activity related to the integration of technology in English language teaching in Indonesia in the 21st century. The activity was conducted for junior high school English language teachers in Depok District, Indonesia. It outlines the opportunities and challenges faced by teachers in incorporating technology into their teaching and learning processes. Key themes emerging from the activity, include enhancing English language proficiency, increasing engagement and motivation, developing 21st-century skills, cultural exchange and global awareness, as well as the role of teachers and professional development. However, the effectiveness of technology integration heavily relies on the teachers' proficiency, availability of infrastructure, and pedagogical adaptation. The findings of the activity highlight the importance of comprehensive teacher training programs, improvements in educational infrastructure, and a pedagogical shift towards a curriculum more inclusive of technology. Recommendations include enhancing collaboration among stakeholders to support a technology-enriched learning environment to meet the evolving needs of learners in Indonesia.
Deep Learning Approach in English Language Teaching: Does It Matter a Lot? Bachtiar, Bachtiar; Zuhairi, Aminudin; Maya Puspitasari; Sylvia
BUDIMAS : JURNAL PENGABDIAN MASYARAKAT Vol. 7 No. 2 (2025): BUDIMAS : Jurnal Pengabdian Masyarakat
Publisher : LPPM ITB AAS Indonesia Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29040/budimas.v7i2.17381

Abstract

This paper reports the outcomes of a ‘Community Service’ activity related to the implementation of the Deep Learning (DL) approach in English language teaching in Indonesia. The activity was conducted for junior high school English language teachers in Bogor regency, Indonesia. It outlines the design, implementation, and evaluation of a structured professional development program aimed at equipping teachers with the knowledge, skills, and reflective capacity needed to adopt Deep Learning within the framework of Indonesia’s Merdeka Belajar curriculum. Drawing on Michael Fullan’s 6Cs framework (i.e., character, citizenship, collaboration, communication, creativity, and critical thinking), the activity emphasized pedagogical transformation that moves beyond traditional content delivery toward student-centered, inquiry-based learning. The program adopted a four-stage model: observation, socialization, training and mentoring, and evaluation. These stages allowed facilitators to map the instructional realities of the participants, co-construct relevant training content, and evaluate the impact through both qualitative and quantitative measures. The results indicated a significant increase in teachers’ awareness of DL principles, improved pedagogical confidence, and willingness to implement more meaningful and contextualized English Language Teaching (EFL) practices. Key themes explored included the coherence between DL and the national Profil Pelajar Pancasila, strategies to overcome implementation challenges, and the integration of AI tools to enhance 21st-century competencies. The findings suggest that DL offers a transformative avenue for revitalizing ELT in Indonesia by aligning global educational innovations with local policy goals. This paper recommends sustained investment in teacher training, digital infrastructure, and curricular alignment to ensure scalable and equitable adoption of DL nationwide.
Reposisi Hukum Kelembagaan BNPP dalam Tata Kelola Pembangunan Wilayah Perbatasan Wicaksono, Filipus Wahyu Wicakson; Isnaeni, Belly; Bachtiar, Bachtiar
Jurnal Ilmu Hukum, Humaniora dan Politik Vol. 6 No. 1 (2025): (JIHHP) Jurnal Ilmu Hukum, Humaniora dan Politik
Publisher : Dinasti Review Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/jihhp.v6i1.6369

Abstract

Kelembagaan Badan Nasional Pengelola Perbatasan (BNPP) sebagai institusi koordinatif pembangunan wilayah perbatasan Indonesia menghadapi berbagai persoalan normatif dan struktural yang menghambat efektivitas kerjanya. Permasalahan utama terletak pada status subordinatif BNPP di bawah Kementerian Dalam Negeri yang melemahkan posisi kelembagaan, ditambah dengan defisit kewenangan regulatif dan absennya kerangka hukum yang mengikat kementerian teknis. Penelitian ini bertujuan untuk mengkaji ulang konstruksi hukum BNPP dalam arsitektur kelembagaan pembangunan nasional dengan menekankan pentingnya reposisi yuridis kelembagaan guna memperkuat fungsi koordinatif dan akuntabilitasnya. Pendekatan yang digunakan adalah yuridis-normatif dengan metode analisis deskriptif-kualitatif dan didukung oleh studi perundang-undangan, dokumen kebijakan, serta literatur akademik terakreditasi. Hasil analisis menunjukkan bahwa ketiadaan otoritas hukum yang kuat menyebabkan fragmentasi kebijakan antar kementerian, ketimpangan relasi pusat-daerah, serta rendahnya partisipasi subnasional dalam perencanaan pembangunan perbatasan. Evaluasi kebijakan pun belum terintegrasi dalam siklus kebijakan BNPP, sehingga keberhasilan hanya diukur dari output fisik tanpa memperhatikan dampak sosial dan geopolitik. Penelitian ini merekomendasikan perlunya pembentukan Undang-Undang Pengelolaan Perbatasan yang memberikan kewenangan regulatif kepada BNPP, reposisi kelembagaan agar lebih otonom, penguatan mekanisme evaluasi berbasis data spasial dan sosial, serta peningkatan partisipasi daerah dalam proses pengambilan keputusan. Reposisi hukum kelembagaan BNPP bukan sekadar kebutuhan administratif, melainkan agenda strategis untuk mewujudkan tata kelola perbatasan yang adil, integratif, dan konstitusional.
VEGETATION AND TEMPERATURE AS DETERMINANTS IN THE EGG-LAYING BEHAVIOR OF HAWKSBILL TURTLES (ERETMOCHELYS IMBRICATA) AND LOGGERHEAD TURTLES (CARETTA CARETTA) Puspaningrum, Dian; Bachtiar, Bachtiar; Ernikawati, Ernikawati
Journal of Selvicoltura Asean Vol. 2 No. 4 (2025)
Publisher : Yayasan Adra Karima Hubbi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70177/jsa.v2i4.1863

Abstract

Vegetation and temperature are biophysical parameters that affect sea turtle nesting behavior. Coastal vegetation is essential to the nesting behavior of Loggerhead sea turtles. In contrast to Hawksbill sea turtles, Loggerhead sea turtles preferentially select sandy beaches for nesting. The study aimed to measure the impact of vegetation and temperature on sea turtle nesting behaviors and to offer detailed insights on adaptation and enhanced conservation techniques to save sea turtles from environmental changes. The study was performed on Popaya Island, within the Nature Reserve of Mas Popaya Raja Island, North Gorontalo, from January to March 2023. Identification of population and sample using the purposive sampling method for all turtles observed throughout the observation phase. The findings indicated that Hawksbill turtles (Eretmochelys imbricata) favored nesting in locations characterized by greater plant diversity and density, averaging 195 eggs per nest. Loggerhead turtles (Caretta caretta) deposited a comparatively lower number of eggs (88 eggs) than at other locations (96 - 108 eggs). Some eggs were found in places with no surrounding vegetation. The nesting activity of loggerheads in non-vegetated regions may have been affected by the shallowness of the holes and their comparatively broader width. The sand surface temperature in areas with dense flora and biodiversity decreases, impacting egg-laying activity as one moves further from the vegetation's border.
Co-Authors Aa Juhanda admin admin, admin Adriman, Ramzi Ahmad Alwi Nurudin Ait Novatiani Al-Majid, Faisal Setiawan Anggraeni, RR Dewi Anhar, Bani Aqilah, Jihan Ardiasih, Lidwina Sri Ari, Muhammad Arief Rachmawan, Arief Arif Rachman Arismunandar Arismunandar Ashariana, Ashariana Atima, Moh. Zulkarnain Aulia, Salsa Najwa Azzahara, Gia Arya Baenuri, Dzulkipli Bambang Santoso Bambang Wiyono, Bambang barakat, nurjamilah Bastianon, Bastianon Belvana, Salsabila Chaerunnisa, Alifia Chrisputranto, Matheus Raditya Christina, Veronica D, Nabilah Hana’a Darmanto, Erlambang Budi Darsikin Darsikin Defruzer, Defruzer Dika Anggara Diki Hermawan, Diki Djabar, Murni Dusa, Riswanto Eriek Wahyu Restu Widodo Erik Erik, Erik ernikawati, ernikawati Faizat, Faizat Firman Maulana, Firman Firman Septiadi Gueci, Rizal S Gunawan Gunawan H, Syahril Hadi Sutopo Hakim, Firman Nur Handayani, Fice Hasan, Zaenab hasran, Hasran HS, Christnatalis Hussien, M. Rabiddin Ilham Khoirul Ibad Ilham Kurniawan ilham, rio Imanuddin, Iman Irasuti, Irasuti Ismitasari, Elisa Isnaeni, Beli Isnaeni, Belly Juhana, Juhana Juliani, Evy Hanisa Karim Al Amin, Mochammad Karim, Rilman Khoirul Rahmat, Imam Khomariah, Nur Kurnia Syamba, Rangga Dharma Ma'ruf, Buana Maulana, Fahmi Mauritz Simanjuntak, Mauritz Maya Puspitasari Maya Puspitasari, Maya Miftachul Munir, Moh Miftachul Munir, Moh. Mochammad Karim Al Amin Moh. Syaiful Amri Moonti, Roy Marthen Muhammad Fauzi Muhammad Saleh Mujiono Mujiono Mukhlis Mukhlis Muna, Siti Umamah Naili Mustaghfirin, Muhammad Anis Mutia, Andi Khairun N. Laratu, Wahyuni Nadila, Nadila Nisazarifa, Adristi Noe, Najwa Sesilya Nova Susanti Novianto, Robertus Ary Nuddin, Nuddin Nuna, Ain Anggraini Nuraeni, Hilda Nurlaelasari, Ella Olii, Rahmat Pakaya, Ariyanti Pakelo, Irfandi Panggabean, Donwil Patmawati Patmawati, Patmawati Prastiwi, Dian Eka Pratama Putra, Mochammad Yudha Aditya Pratama, Fathir Bayu Pratama, Panduma Putra Priyambodo Nur Ardi Nugroho Puadi, Puadi Puspaningrum, Dian Putera, Erwien Yuliansyah Rahman Rahman Rahmawati, Nadila Ramkar, Rahma Sakura Raya, Loisa Diana Riau, Dwi Putranto RICO, MUHAMMAD Rizky, Raninda Anjania Rony, Rony Rosmini Rosmini Rossi, Roberto RR. Ella Evrita Hestiandari Ruminda Ruminda Ruruh, Alexander Rusdiyanto, Edi Sadeli, Lili Sahlania, Onno Sakti, Supian Sarumpet, Tetty Lasniroha Setiawan, Tato Sipayung, Mardin Siti Mawaddah, Siti Soelistijono, Rafi Febian Soewita, Samuel Sri Ardiasih, Lidwina Sri Dewi Nirmala Sriwati Sriwati Suharto Suharto Suhendra Suhendra Suleman, Vikisastro Supriyanti Supriyanti Susanto Susanto Syamsudin, Muhamad Syamsuri, M. Abiyarhab Syauri, Muhammad Sofian Sylvia Tamara, Heni Aulia Tarmizi Tarmizi Udi Samanhudi Uno, Moh. Erikrianto Victoria, Jaka Wahdah, Wahdah Wahyono Wahyono Wahyono, Dhoni Presti Wahyudin Wahyudin Wening Nugraheni Wicaksono, Filipus Wahyu Wicaksono, Filipus Wahyu Wicakson Widya Rizky Pratiwi, Widya Rizky Widyastuti, Dwi Wijaya, Aida Yulianah, Yola Yulianingsih, Ika Zakaria, Abdul Majid Zuhairi, Aminudin