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All Journal J-Sil (Jurnal Teknik Sipil dan Lingkungan) BERKALA FISIKA Jurnal Ilmu Dasar POSITRON 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 Phi : Jurnal Pendidikan Fisika dan Terapan 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 Journal of Multidisciplinary Applied Natural Science JURNAL LENTERA AKUNTANSI at-Tarbiyah al-Mustamirrah: Jurnal Pendidikan Islam Pharmaceutical Sciences and Research (PSR) Makara Journal of Science Indonesian Journal of Physics (IJP) at-Tarbiyah al-Mustamirrah: Jurnal Pendidikan Islam Jurnal Pengabdian Sosial Jurnal Sains Materi Indonesia Greensusmater
Khairurrijal Khairurrijal
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Institut Teknologi Bandung,
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry 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 Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Public Health Social Sciences Transportation Other

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Cross-linking formation of taro starch (colocasia esculenta)-based hydrogel using freeze-thaw method: synthesis and physical characterization Luthfianti, Halida Rahmi; Nafisah, Nuraini; Waresindo, William Xaveriano; Sawitri, Asti; Hapidin, Dian Ahmad; Noor, Fatimah Arofiati; Elfahmi, Elfahmi; Edikresnha, Dhewa; Khairurrijal, Khairurrijal
Greensusmater Vol. 2 No. 2 (2025)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2025.2.2.36-48

Abstract

This study successfully made starch from taro tuber flour using immersion methods (AQ, SM) and centrifugation methods (CE). Taro starch with the AQ method produced the most starch content, thus improving the viscosity parameter in the pasting properties test. A simple mathematical model was used to control the taro starch pasting process and product. The highest R-value in the AQ sample was 309.88 s, indicating the strongest starch granule resistance. Meanwhile, the S-value in this study showed that all samples were above 1, which indicated that water penetration affected the swelling rate of starch granules. Taro starch with different isolation methods was analyzed for hydrogel formation using optical microscopy, SEM, swelling degree test, weight loss, color analysis, and texture profile analysis (TPA). The morphological images show three phases of a taro starch hydrogel formation: granular, potential cross-linking, and cross-linking hydrogel with a firm structure. Optimization of freeze-thaw process parameters was carried out to determine the optimum parameters of starch hydrogel formation, which was obtained under freezing conditions for 17 hours at -23°C and thawing for 7 hours at 4°C. The sample CE resulted in the most stable hydrogel formation, showing the highest amylose content, protein content, and the lowest impurities or ash content. The CE starch concentration of 10% resulted in the highest swelling degree and the lowest weight loss, indicating that the ability of the hydrogel to maintain its structure was stronger and more elastic. The textural properties of CE hydrogel at a concentration of 10% showed the most stability. It had the highest hardness, fracturability, chewiness, and springiness. Physical characteristics showed that the starch hydrogels had a dense, porous surface and formed a cross-linking structure. It can potentially be used in functional food applications to control the release of bioactive compounds. 
PERANAN AUDIT INTERNAL DALAM MENUNJANG EFISIENSI DAN EFEKTIVITAS PENGENDALIAN INTERNAL PADA SISTEM PENGGAJIAN PT ILLUMINATI METAMORPHOSIS Azzahra, Asya; Alyah R, A. Fadilah; Khairurrijal, Khairurrijal; Ramadhani, Dwi Zahra; Ramadhani, Misliyatul
JURNAL LENTERA AKUNTANSI Vol. 10 No. 2 (2025): JURNAL LENTERA AKUNTANSI, November 2025
Publisher : POLITEKNIK LP3I JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34127/jrakt.v10i2.1927

Abstract

The payroll system is one of the processes most vulnerable to errors and fraud, making effective internal control and the role of internal audit essential to ensure accuracy, transparency, and accountability. This study aims to analyze the role of internal audit in supporting the efficiency and effectiveness of internal control within the payroll system of PT Illuminati Metamorphosis. A descriptive qualitative approach was employed through interviews, observations, and documentation related to payroll procedures and internal monitoring mechanisms. The findings indicate that the implementation of internal audit at PT Illuminati Metamorphosis is not yet fully adequate due to the absence of formal written policies and procedures, as well as insufficient separation of duties. Although internal audit contributes to enhancing the efficiency and effectiveness of the payroll process, improvements are still required, particularly in documentation practices, segregation of duties, and the development of a digital payroll system to strengthen internal control.
Porous Si (111) Fabrication Using Electrochemical Anodization: Effects of Electrode Distance and Current Density Risa Suryana; Fauzi Ahmad Bogas; Kuwat Triyana; Khairurrijal Khairurrijal; Heru Susanto
Jurnal Teori dan Aplikasi Fisika Vol. 9 No. 1 (2021): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v9i1.276

Abstract

Evaluating the Potential of Agarose Hydrogel Incorporating Eggshell Powder as a Sustainable Medium for Seedling Growth Nuryantini, Ade Yeti; Mahen, Ea Cahya Septia; Oktaviani, Indri; Nuryadin, Bebeh Wahid; Edikresnha, Dhewa; Khairurrijal, Khairurrijal
Journal of Multidisciplinary Applied Natural Science Articles in Press
Publisher : Pandawa Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47352/jmans.2774-3047.376

Abstract

Hydrogels represent a promising alternative for plant cultivation, offering excellent water and nutrient retention. This study reports the synthesis and characterization of an agarose-based hydrogel composite enhanced with eggshell powder (ESP). The hydrogel composites were prepared in four agarose-to-ESP ratios: 10:0 (Hyd-ES0), 10:1 (Hyd-ES1), 10:3 (Hyd-ES3), and 10:5 (Hyd-ES5). Fourier-transform infrared spectroscopy (FTIR) analysis revealed minimal peak shifts, indicating no significant chemical modifications. Characteristic ESP peaks were identified in the composite hydrogels, confirming the effective integration of ESP into the agarose matrix. The addition of ESP reduced the decomposition rate of the hydrogels and increased macromolecular stability. Density measurements indicated higher density with increasing ESP concentration, supported by enhanced crystal formation, as evidenced by more intense diffraction peaks in X-ray diffraction (XRD) patterns. Morphological analysis revealed that the porosity of the hydrogel, swelling, and weight-loss tests showed a decline in both properties with higher ESP content. Seed germination experiments demonstrated that stem, root, and leaf growth, as well as fresh and dry weights, were most optimal with the Hyd-ES1 hydrogel composite. Thus, Hyd-ES1 hydrogel exhibits significant potential as a medium for seed germination and plant growth.
A Novel Fiber Collection System for Rotary Force Spinning Method Dian Ahmad Hapidin; Elvina Ayu Ratnasari; Aan Priyanto; Khairurrijal Khairurrijal
Greensusmater Vol. 3 No. 1 (2026)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/gsm.2026.06

Abstract

Recent advancements in micro- to nano-scale fiber production, particularly through rotary force spinning (RFS), offer high production rates but face challenges in optimizing fiber collection efficiency. This study investigates the effect of spinneret angular speed on fiber collection performance of a novel RFS collector system. The collector system integrated zig-zag pole collectors with a rolling collector that seamlessly traverse between the poles for fiber assembly. This configuration enabled the produced fibers to be continuously assembled onto the rolling collector, thereby forming fibrous membranes directly during the spinning process. The collection performance was evaluated using polyvinylpyrrolidone (PVP) fibers fabricated at spinneret angular speeds ranging from 4000 to 11000 rpm. The results showed that the rolling collector captured up to 95.39% of the produced fibers at a high rotational speed of 11,000 rpm, whereas at lower rotational speed, most fibers were deposited onto the pole collectors, reaching 95.19% at 4000 rpm. These findings indicate that the proposed collector system effectively enhances fiber collection efficiency over a broad rotational speed range while enabling direct fibrous membrane formation in the RFS process.
Numerical Simulation of Tunneling Current in an Anisotropic Metal-Oxide-Semiconductor Capacitor Fatimah A. Noor; Ferry Iskandar; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 10, No 3: September 2012
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v10i3.826

Abstract

In this paper, we have developed a model of the tunneling current through a high- dielectric stack in MOS capacitors with anisotropic masses. The transmittance was numerically calculated by employing a transfer matrix method and including longitudinal-transverse kinetic energy coupling which is represented by an electron phase velocity in the gate. The transmittance was then applied to calculate tunneling currents in TiN/HfSiOxN/SiO2/p-Si MOS capacitors. The calculated results show that as the gate electron velocity increases, the transmittance decreases and therefore the tunneling current reduces. The tunneling current becomes lower as the equivalent oxide thickness (EOT) of HfSiOxN layer increases. When the incident electron passed through the barriers in the normal incident to the interface, the electron tunneling process becomes easier. It was also shown that the tunneling current was independent of the substrate orientation. Moreover, the model could be used in designing high speed MOS devices with low tunneling currents.
KARAKTERISTIK ARUS FILM TIPIS CeO2 DAN Nd-CeO2 YANG DIDEPOSISIKAN DI ATAS SUBSTRAT Si(100) MENGGUNAKAN TEKNIK PULSED-LASER ABLATION DEPOSITION (PLAD) Iis Nurhasanah; Khairurrijal Khairurrijal; Mikrajudin Abdullah; Bambang Ariwahjoedi; Maman Budiman; Sukirno Sukirno
Jurnal Sains Materi Indonesia Vol. 7 No. 4 (2006): Edisi Khusus
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jusami.2006.0.0.5178

Abstract

KARAKTERISTIK ARUS FILM TIPIS CeO2 DAN Nd-CeO2 YANG DIDEPOSISIKAN DI ATAS SUBSTRAT Si(100) MENGGUNAKAN TEKNIK PULSED-LASER ABLATION DEPOSITION (PLAD). Karakteristik arus film tipis CeO2 dan Nd-CeO2 yang dideposisikan di atas substrat p-Si(100) menggunakan teknik Pulsed-Laser Ablation Deposition (PLAD) telah diamati melalui pengukuran arus-tegangan (I-V). Film tipis CeO2 memiliki rapat arus yang lebih besar 2 orde dari film tipis Nd-CeO2. Perbedaan rapat arus dapat dijelaskan berdasarkan perbedaan orientasi kristal, keadaan trap dan tinggi potensial penghalang. Mekanisme konduksi yang terjadi terutama adalah Space-Charge Limited Current (SCLC) pada tegangan rendah dan emisi Schottky pada tegangan tinggi. Diketahui pula bahwa potensial penghalang film tipis Nd-CeO2 lebih besar dari film tipis CeO2 dan memberikan kontribusi terhadap penurunan rapat arus.
Co-Authors A. Suhendi A. Y. Nuryantini A.A. Ketut Agung Cahyawan W Aan Priyanto Ade Yeti Nuryantini Adhha, Nurul Adi Bagus Suryamas Adi Bagus Suryamas Adi Bagus Suryamas Afifah Rosyidah Agus Riyanto Ahmad Aminudin Ahmad Fahmi Alan Maulana Alan Maulana Ali Jusri Pohan Alvian Hayu Sudibya Alyah R, A. Fadilah Ambran Hartono Andika Putra Anrokhi, Mohamad Samsul Aramel, Aramel Arif Surachman Aris Priatama Aris Priatama Asti Sawitri Astuti Astuti Aunuddin Syabba Azzahra, Asya Azzahwa, Taufik Bambang Ariwahjoedi Bambang Ariwahjoedi Bambang Ariwahjoedi Bebeh Wahid Nuryadin Bimastyaji Surya Ramadan Cuk Imawan Darsikin Darsikin Dayu Apoji Deddy Kurniadi Dhewa Edikresnha Dian Ahmad Hapidin Djulia Onggo Edi Sanjaya Edi Wibowo Edy Wibowo Eka Sentia Ayu Listari Ekawita, Riska Elfahmi Elfahmi, Elfahmi Elvina Ayu Ratnasari 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 Fatimah Arofiati Noor Fauzi Ahmad Bogas Ferry Iskandar Freddy Haryanto Freddy Haryanto Fuji Hernawati Kusumah Fuji Pratami H Mahfudz Hasbullah Nawir, Hasbullah Hasibuan, Maryam Hasim Hermawan K. Dipojono Hernawan Mahfudz Heru Susanto Hutapea, Alfon Hutwan Syarifuddin Hwa, Lee Myong Iis Nurhasanah 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 Lubis, Nur Hamidah Lubis, Willy Akmansyah Luthfianti, Halida Rahmi M. Barmawi M. M. Munir M. P. Ekaputra Maharati Hamida Maman Budiman Mamat Rokhmat Maria Evita Masturi Masturi Masturi Masturi Memoria Rosi Mentari, Sekar 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 Munir, Muhammad Miftahul Nafisah, Nuraini Nafisah, Nur’aini Nasution, Nur Saidah Ningsih Rezeki Noviyanto, Alvian Novriadi, Novriadi Nst, Rizky Sholatiah Yasin Nur A. Aprianti Nurul Taufiqu Rochman Oktaviani, Indri Priyanto, Aan Rahmayanti, Handika Dany Rahmondia N. S Rajak, Abdul Ramadhani, Dwi Zahra Ramadhani, Misliyatul Ramli Ramli Ramli Ramli Rezeki, Ningsih Ricky Dwi Septianto Risa Suryana Riska Ekawita Riska Ekawita Rodhiyah, Marathur Sahrul Saehana Sangian, Messiah Charity Septia Mahen, Ea Cahya Septianto, Ricky Dwi Silvia Surini Silvia Surini Sri Hartati Sukirno . Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Suprijadi Suprijadi Suprijadi Suprijadi Sutisna Sutisna Syahputra, Tri Siswandi Syuhada, Ibnu T. Suciati Tarmizi Taher Taufik Adi Nugraha Togar Saragi Toto Winata Toto Winata Toto Winata Widhya Budiawan Widhya Budiawan William Xaveriano Waresindo Yuan Alfinsyah Sihombing Yudha Gusti Wibowo Yudi Darma Yulkifli Yulkifli Zaki Suud Zulfi, Akmal