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All Journal J-Sil (Jurnal Teknik Sipil dan Lingkungan) BERKALA FISIKA Jurnal Ilmu Dasar Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Sains Materi Indonesia Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Pendidikan Fisika Indonesia Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Widyariset Science and Technology Indonesia Indonesian Journal of Chemistry Jurnal Otomasi Kontrol dan Instrumentasi WIDYA LAKSANA Jurnal Teori dan Aplikasi Fisika Indonesian Journal of Electrical Engineering and Computer Science Widyariset El-Hekam : Jurnal Studi Keislaman Pharmaceutical Sciences and Research (PSR) Indonesian Journal of Physics (IJP)
Khairurrijal Khairurrijal
Kelompok Keilmuan Fisika Material Elektronik, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Social Sciences Transportation Other

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A Structural Mechanics Approach for the Vibrational Analysis of Single-Layered Graphene Sheets Andika Putra; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 20 No 4 (2009): Vol. 20 No. 4, October 2009
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (592.901 KB) | DOI: 10.5614/itb.ijp.2009.20.4.4

Abstract

A structural mechanics approach has been employed to analyze the vibrational behavior of single-layered graphene sheets. By adopting this approach, natural frequencies and mode shapes are obtained for different chirality and imposed boundary conditions. Numerical results from the implemented modeling are examined to provide predictive equations for fundamental frequencies of cantilevered and bridged graphene sheets. With the proposed equations, the natural frequencies can be predicted and are comparable to those obtained from theoretical consideration and experimental results.
Density-Functional Study of Electronic Band Structure of Graphene with H2, H, and N Impurities Taufik Adi Nugraha; Fatimah A. Noor; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Indonesian Journal of Physics Vol 21 No 1 (2010): Vol. 21 No. 1, January 2010
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (774.768 KB) | DOI: 10.5614/itb.ijp.2010.21.1.2

Abstract

Graphene is widely investigated for many applications because of its unique properties. One of the most surprising phenomena is the change of its electronic band structure due to impurities adsorption. The density-functional study has been performed to obtain the electronic band structure of graphene with molecular hydrogen H2, atomic hydrogen H, and atomic nitrogen N impurities. Pure graphene has no band gap because the bonding and anti-bonding states are degenerate at the K point at which the Fermi level passes. Molecular hydrogen H2 adsorption gives the same result, while atomic hydrogen H and nitrogen N adsorptions on graphene could result in indirect-band gaps of 2.67 and 4.68 eV, respectively. These results bring impure graphene as a promising candidate for electronic device applications in the future.
Emerging Strategies for Mitigating Acid Mine Drainage Formation and Environmental Impacts: A Comprehensive Review of Recent Advances Yudha Gusti Wibowo; Muhammad Fauzul Imron; Setyo Budi Kurniawan; Bimastyaji Surya Ramadan; Tarmizi Taher; Alvian Hayu Sudibya; Hutwan Syarifuddin; Khairurrijal Khairurrijal; Jarwinda
Science and Technology Indonesia Vol. 8 No. 4 (2023): October
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.2023.8.4.516-541

Abstract

Acid mine drainage (AMD) is a significant threat to the environment due to its high acidity and metal ion content. To effectively eliminate pollutants from AMD, various approaches are necessary. This review aims to provide a comprehensive understanding of recent advances in AMD mitigation. While treatment technologies have developed to eliminate AMD, they often produce sludge as a by-product and require expensive maintenance. As a cost-effective alternative, the recovery of AMD resources can reduce toxicity and promote reuse of heavy metals and rare earth elements. This review also analyzes the challenges and prospects of AMD mitigation implementation, including current mitigation conditions and knowledge gaps. Researchers can benefit from this review by gaining insight into research progress in this area, identifying strengths and weaknesses of current AMD mitigation applications, and exploring future research directions.
The Effect of Nonwoven Microfiber Substrate Polypropylene Thickness to Air Filtration Performance of Polyacrilonitrille Nanofiber Rajak, Abdul; Syahputra, Tri Siswandi; Munir, Muhammad Miftahul; Khairurrijal, K.
Jurnal ILMU DASAR Vol 20 No 2 (2019)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1512.963 KB) | DOI: 10.19184/jid.v20i2.9658

Abstract

Since a nanofiber medium on itself is soft and fragile and cannot be used alone as air filters. Coating nanofiber on a rigid substrate to form a composite that can be handled readily is necessary. Beside can improve the filtration efficiency, adding the substrate will also save the use of nanofibers mat itself. The aim of this study is to evaluate the effect of substrate thickness on the performance of nanofibers mat in aerosol filtration in order to find the optimum thickness of substrate that can increase the quality of nanofiber filter. The substrate used was a low cost microfiber non-woven fabric made from polypropylene (PP). The nanofibers mat was composed of electrospun polyacrylonitrile (PAN) with concentration of 9 wt.% which dissolved at N,N dimethylformamide (DMF). Five variations of PP different in thickness was used as substrate. From the SEM image, it was found that there is increasing fiber diameter of PAN after electrospun into PP substrate. From the porosity estimation of each nanofiber, it was found that the porosity decreased with increasing the substrate thickness. For test the performance of nanofiber filter, the particles of polystyrene latex (PSL) which generated by atomizer was used as the aerosol particle. In addition, to evaluate the performance filter in PM2.5 filtration, the experiment was carried out with generate the smoke from burning incense. Air filtration performance of all variations is obtained by comparison the results of measurement including: pressure drop, efficiency and quality factor. From the results, there is limitation on the substrates thickness based on the value of the quality factor obtained. Overall, PP nonwoven as the substrates gives the great contribution on the efficiency of PAN nanofiber. Keywords: substrate, polypropylene, thickness, nanofiber, air filtration.
Revitalization of Ecotourism with Commercialization of Coral Transplantation Based on Productive Communities Adhha, Nurul; Novriadi, Novriadi; Fahmi, Ahmad; Hutapea, Alfon; Azzahwa, Taufik; Khairurrijal Khairurrijal
JURNAL WIDYA LAKSANA Vol 13 No 2 (2024)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jwl.v13i2.85180

Abstract

Destructive fishing practices and suboptimal tourism management threaten the sustainability of the underwater ecosystem and the welfare of the people of Pulau Pahawang Village. To overcome this problem, there needs to be an effort to revitalize ecotourism by commercializing productive community-based coral transplantation. This study aims to design and implement a community-based ecotourism revitalization program focusing on coral transplantation, waste management, and the development of sustainable ecotourism management. This type of research is community action research (PTM) with a participatory research design. The subjects of the study involved 50 members of the Pulau Pahawang Village community, consisting of 20 BumDes members and 30 Pokdarwis members. The data collection method used observation, interviews, and documentation. The instruments used were interview guides, observation sheets, and questionnaires. Data analysis was carried out using qualitative descriptive analysis techniques to describe the changes that occurred in the community and ecosystem. The results of the study showed that this program succeeded in issuing 15 Business Identification Numbers (NIB) for local business actors, developing Seawalker rides, and improving sustainable waste management. This program also succeeded in increasing public awareness of the importance of environmental conservation and good ecotourism management. This study concludes that a community-based approach to ecotourism revitalization can improve community welfare and maintain ecosystem sustainability.
Co-Authors A. Suhendi A. Y. Nuryantini A.A. Ketut Agung Cahyawan W Adhha, Nurul Adi Bagus Suryamas Adi Bagus Suryamas Adi Bagus Suryamas Afifah Rosyidah Agus Riyanto Ahmad Aminudin Ahmad Fahmi Alan Maulana Alan Maulana Alvian Hayu Sudibya Ambran Hartono Andika Putra Anrokhi, Mohamad Samsul Apoji, Dayu Arif Surachman Aris Priatama Aris Priatama Astuti Astuti Aunuddin Syabba Azzahwa, Taufik Bambang Ariwahjoedi Bambang Ariwahjoedi Bebeh Wahid Nuryadin Bimastyaji Surya Ramadan Cuk Imawan Darsikin Darsikin Dayu Apoji Deddy Kurniadi Djulia Onggo Edi Sanjaya Edi Wibowo Edy Wibowo Ekawita, Riska Endah Rahmawati Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah A. Noor Fatimah Arofiati Noor Fauzi Ahmad Bogas Ferry Iskandar Freddy Haryanto Freddy Haryanto H Mahfudz Hasbullah Nawir, Hasbullah Hermawan K. Dipojono Hernawan Mahfudz Hernawan Mahfudz Heru Susanto Hutapea, Alfon Hutwan Syarifuddin Hwa, Lee Myong Iis Nurhasanah Indra Wahyudin Fathonah Ismunandar Ismunandar Jarwinda Junaidi Junaidi Kurniawan, Setyo Budi Kuwat Triyana Lee Myong Hwa Lilik Hasanah Lilik Hasanah Lilik Hasanah lis Nurhasanah M. Barmawi M. M. Munir M. P. Ekaputra Maharati Hamida Maman Budiman Maman Budiman Maman Budiman Maman Budiman Maman Budiman Mamat Rokhmat Maria Evita Masturi Masturi Masturi Masturi Memoria Rosi Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Abdullah Mikrajuddin Mikrajuddin Mikrajuddin Mikrajuddin Mikrajudin Abdullah Mitra Djamal Mitra Djamal Mohamad Barmawi Muhammad Fauzan Muhammad Fauzul Imron Muhammad Miftahul Munir Novriadi, Novriadi Nur A. Aprianti Rahmayanti, Handika Dany Rahmondia N. S Rajak, Abdul Ramli Ramli Ramli Ramli Rezeki, Ningsih Ricky Dwi Septianto Risa Suryana Riska Ekawita Riska Ekawita S Saehana Sekar Mentari Septia Mahen, Ea Cahya Septianto, Ricky Dwi Silvia Surini Sukirno . Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Suprijadi Suprijadi Suprijadi Suprijadi Sutisna Sutisna Syahputra, Tri Siswandi T. Suciati Tarmizi Taher Taufik Adi Nugraha Togar Saragi Toto Winata Toto Winata Toto Winata Widhya Budiawan Widhya Budiawan Yudha Gusti Wibowo Yudi Darma Yulkifli Yulkifli Zaki Suud