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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Bulletin of Electrical Engineering and Informatics Jurnal Teknosains Sinergi Journal of Engineering and Technological Sciences JFA (Jurnal Fisika dan Aplikasinya) Jurnal Teknik Mesin Konversi Turbo : Jurnal Program Studi Teknik Mesin Jurnal Kimia Terapan Indonesia Indonesian Journal of Chemistry Jurnal Teknik Mesin Indonesian Journal of Energy Jurnal Inovasi Teknik Kimia Indonesian Journal of Electrical Engineering and Computer Science IJCR (Indonesian Journal of Chemical Research) Journal of Materials Exploration and Findings International Journal of Innovation in Mechanical Engineering and Advanced Materials Journal of Bioresources and Environmental Sciences Journal Of Carbazon Jurnal Sains Materi Indonesia Journal of Batteries for Renewable Energy and Electric Vehicles
Deni Shidqi Khaerudini
Universitas Mercu Buana
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Characteristics of Sodium Lithium Titanate Synthesized at Different Solid-State Reaction Temperature for Lithium-Ion Battery Anode Yahya, Ilham Nur Dimas; Sofyan, Nofrijon; Khaerudini, Deni Shidqi; Timuda, Gerald Ensang; Priyono, Slamet
Journal of Materials Exploration and Findings Vol. 2, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The effect of sintering temperature on the characteristics of sodium lithium titanate (NaLiTi3O7/NaLTO) synthesized at different solid-state reaction temperature and its performance as lithium-ion battery anode has been investigated. The precursors for the synthesis consisted of LiOH.H2O, TiO2, and NaHCO3. The synthesis was performed via solid-state reaction method. The precursors were mixed and sintered at variation temperatures of 900oC, 1000oC, and 1100oC for 2 hours under atmosphere condition. The final product was characterized using X-ray diffraction (XRD) and particle size analyzer (PSA). The XRD analysis showed the main phase of NaLTO with some impurities. PSA analysis showed that the sintering temperature has a significant effect on changes in particle size where the sample at a temperature of 1100oC has the largest particle size of 74.62 µm. The battery was fabricated by firstly mixing NaLTO powder with polyvinylidene fluoride (PVDF) and acetylene black (AB) in a ratio of 85:10:5 wt.% and the mix was then deposited onto copper foil to form NaLTO a sheet. The NaLTO sheet was cut into circular discs with a diameter of 14 mm and were arranged in a sequence of separator, metallic lithium, and electrolyte to form a coin cell in a glove box. Characterization using cyclic voltammetry (CV) and charge-discharge (CD) showed that the NaLTO sintered at 1000oC provided good electrochemical performance with the largest diffusion coefficient of 3.948 x 10-10 m2/s, Coulombic efficiency reached 100%, and a high specific capacity of 65.83 mAh/g.
Chemical and physical activation of natural pyrite as potential inorganic pigment material Iqbal, Rendy Muhamad; Simarmata, Sari Namarito; Sinaga, Tiara Cristy; Simanjutak, Elfrida Roulina; Putra, Riandy; Khaerudini, Deni Shidqi
Konversi Vol 13, No 1 (2024): April 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v13i1.16947

Abstract

Pyrite is one of the minerals in Borneo Island. It has a disadvantage for soil quality due to its acidity properties. One of the main components of pyrite is iron, which promises to be utilized as an inorganic pigment. This research aims to transform pyrite into red-brown pigment material-based iron oxide. Pyrite mineral transformation through chemical and physical activation, followed by pigment characterization using XRF, XRD, FTIR, and FE-SEM. Based on the XRF result, the highest component is Fe, with a percentage up to 42%. This data is also suitable with an iron oxide phase from the diffractogram of pigment, followed by silica and alumina structure. The heating process successfully changed the color materials from gold to red-brown. Then, the molecular vibration of Fe–O also appears on FTIR spectra at a wavenumber of 483 cm-1 and T–O–T bending at 994 cm-1. Moreover, morphological observation exhibits the aggregation of particles and distribution of iron element spread on the overall area pigment. The color transformation into red-brown pigment can be obtained by pyrite processing into potential inorganic pigment material.
Optimizing the Purging Interval of 1 kW PEM Fuel Cell Control System in Fuel Cell Vehicles Kurniawan, Kurniawan; Tarigan, Kontan; Firdaus Sudarma, Andi; Dwi Pudjisusilo, Raden; Shidqi Khaerudini, Deni
Indonesian Journal of Energy Vol. 7 No. 2 (2024): Indonesian Journal of Energy
Publisher : Purnomo Yusgiantoro Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33116/ije.v7i2.210

Abstract

This study was conducted to explore and understand the duration of purging in fuel cell control systems and their application in fuel cell vehicles, a critical aspect that has a significant impact on the overall performance and efficiency of vehicles or devices that use fuel cell technology. The method adopted in this research involves modeling and simulation using a simulation platform, SIMULINK-MATLAB; modeling is carried out with a program and then validated with test data. This approach allows researchers to replicate and analyze system dynamics virtually to identify existing systems so that empirical models can be identified. Apart from that, the performance characteristics of the given parameters can be known by knowing the model and simulation before the physical implementation is carried out. From the study results, it was found that the modeling carried out with transfer function model 0.02635 s + 1.036/s + 0.04359 and validated with the test results 87.19% fit to estimation data was quite valid so that the model identification could be said to be suitable for this study.
Enhancing voltage stability through wavelet-fuzzy control of hydrogen flow in OC-PEM fuel cell Pangaribowo, Triyanto; Mulyo Utomo, Wahyu; Budiman, Abdul Hamid; Abu Bakar, Afarulrazi; Khaerudini, Deni Shidqi
Bulletin of Electrical Engineering and Informatics Vol 13, No 4: August 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v13i4.7045

Abstract

Open cathode proton exchange membrane fuel cells (OC-PEM fuel cells) serve as electricity generators, utilizing hydrogen as an input source. While effective for fixed loads like residential applications, challenges arise in dealing with output voltage fluctuations caused by rapid load changes. These fluctuations not only impact fuel cell performance but also introduce instability in the supplied power. To solve this issue, the study proposes an innovative hydrogen flow control system employing a feedforward wavelet- fuzzy method. The primary goal of this control system is to enhance fuzzy control performance using wavelets, mitigating signal fluctuations and achieving optimal stability in fuel cell output voltage under constant load conditions. Wavelet functions act as filters on the fuzzy control input, minimizing fluctuations and refining the entire process. Additionally, a feedforward system is incorporated to maintain hydrogen flow at the set point value. The proposed control system is implemented on a validated model using experimental data. Performance analysis reveals that the proposed method effectively stabilizes voltage by accelerating the recovery time from disturbances.
EFFECT ANALYSIS OF ROTATIONAL SPEED CHANGES ON PROPELLER TURBINES ON THE POTENTIAL FOR CAVITATION FORMATION USING COMPUTATIONAL FLUID DYNAMIC METHOD (CFD) Widodo, Aditya Putra; Khaerudini, Deni Shidqi
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 13, No 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v13i3.18667

Abstract

Water is an inexhaustible resource. In Indonesia there are several areas that have the potential of water energy for electricity production. Water energy can be used for electricity production and supports emission reduction programs because it does not produce CO2 emissions during the electricity production process by water turbines. One of the problems experienced by turbines is damage caused by cavitation. Cavitation itself is the formation of air gas bubbles due to very low pressure reaching below the vapor pressure, so that water evaporates at low pressure. This research was conducted to determine the effect of rotational speed on the potential for cavitation. This research was conducted using the CFD method and using the ANSYS application. In the simulation process, several variables are used, namely rotational speed and fluid velocity. The conclusion of this study is that the higher the rotating speed of a propeller turbine, the higher the cavitation potential that will occur in the propeller turbine. Because the higher the rotational speed of a turbine,so the lower the pressure that occurs in the turbine, this is in accordance with Bernoulli's Law. Suggestions for further research can be done with several modifications or variations of the winglet radius so as to get a better design. In addition, in future research it is also possible to modify the angle of the blade so as to reduce the emergence or formation of gas bubbles on the propeller blades due to decreased pressure.
RANCANG BANGUN PENGERING PADI HYBRID SOLAR DRYER DAN PANEL SURYA Pratama, Wisnu; shidqi khaerudini, deni
TURBO [Tulisan Riset Berbasis Online] Vol 13, No 2 (2024): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v13i2.3762

Abstract

Rice drying in Indonesia generally still uses conventional methods by utilizing the heat of sunlight, but weather changes become a problem in the drying process, so that the rice drying process is hampered. Based on this, the purpose of this study is to develop a hybrid solar dryer and solar panel rice drying system. The method used in this study is an experimental method using a design in the form of a cabinet dryer type drying room with a fairly simple design and installation of equipment. Flow simulations were carried out using Autodesk Simulation software, namely Computational Fluid Dynamic (CFD). Three trials were carried out. In trial 1, there was a decrease in humidity of 30%, in trial 2, there was a decrease in humidity of 20% and in trial 3, there was a decrease in humidity of 51% percent. In the third trial, the temperature after drying reached 59.1 ° C, much higher than the first (34.4 ° C) and second (44.9 ° C) trials. Based on the research results, it can be concluded that the process of drying rice using a hybrid solar dryer and solar panels with a drying duration of 2-3 hours with a combination of solar energy and solar panels can achieve optimal results. Sufficient time and high temperatures play an important role in reducing humidity. The level of efficiency of drying rice using a hybrid solar dryer and solar panels has been proven to be able to reduce rice humidity significantly, with the highest humidity reduction achieved in the third trial of 51% which shows that this drying system is effective in reducing water content in rice.
Inovasi dan Optimasi Metode Pirolisis Material Karbon berbasis Serat Bulu Ayam untuk Aplikasi Material Penyimpan Hidrogen Khaerudini, Deni Shidqi
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 7, No 3 (2018)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v7i3.5002

Abstract

Pembuatan material karbon dari limbah serat bulu ayam telah dilakukan untuk mengkaji optimasi metode pirolisis dengan variasi waktu tahan dan temperatur terhadap struktur, luas permukaan, pori, dan morfologi. Inovasi metode pirolisis two-step yang digunakan yaitu untuk mencapai proses karbonisasi optimal berbasis serat bulu ayam. Metode pirolisis dengan variasi two step berdurasi lama, yaitu step one pada temperatur 215 oC selama 15 jam dan dilanjutkan step two dengan variasi pada temperatur 400, 425, dan 450 oC dengan masing-masing variasi waktu tahan selama 1 dan 0,5 jam. Variasi selanjutnya, inovasi metode pirolisis two-step dilakukan dengan kondisi waktu tahan berdurasi singkat, yaitu: step one pada temperatur 200 oC selama 1 jam dan step two pada temperatur 400 oC selama 1 dan 0,5 jam. Laju pemanasan dan pendinginan yang digunakan yaitu 3 oC/menit. Berdasarkan hasil uji true density, nilai densitas semakin kecil pada waktu tahan yang lama dan temperatur karbonisasi terendah. Hasil pengamatan Field Emission Scanning Electron Microscopy (FESEM) menunjukkan bahwa morfologi permukaan karbon dengan nilai densitas terkecil telah terbentuk pori. Hasil uji Brunnaeur-Emmet-Teller (BET) menunjukkan bahwa pori dan luas permukaan tertinggi terbentuk pada karbon dengan densitas terkecil. Berdasarkan hasil pengujian difraksi sinar-X (XRD), menunjukkan struktur karbon berupa semikristalin.
ANALISIS KEMURNIAN OKSIGEN PADA SISTEM PRESSURE SWING ADSORPTION (PSA) DENGAN PENAMBAHAN MASSA MATERIAL ADSORBENT ZEOLIT 13X (600,700 Dan 800 Gram Safaat, Mukhtar; Khaerudini, Deni Shidqi
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 12, No 3 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v12i3.14276

Abstract

Polusi udara menyebabkan masalah pernapasan akut dan kronis yang menjadi perhatian yang berkembang baik dari tingkat global maupun individu. Akibatnya, ada kebutuhan yang berkembang untuk mengatasi kesehatan dan kualitas hidup melalui konsentrator oksigen yang ringan dan portabel dengan pasokan oksigen kelas medis konsentrasi oksigen 88-92%. Penelitian ini bertujuan untuk memilih zeolit yang dapat digunakan untuk menghasilkan gas oksigen dan mengetahui kemurnian oksigen yang dihasilkan pada sitem pressure swing adsoption (PSA) pada setiap variasi massa adsorbent zeolit 13x yang digunakan., Penelitian dilakukan dengan tahapan percobaan pada sistem pressure swing adsorption (PSA) dengan uji adsorpsi menggunakan variasi massa material adsorbent zeolit 13x 600,700 dan 800 gram. Berdasarkan hasil penelitian yang telah dilakukan pada sistem eksperimen pressure swing adsorption (PSA) untuk aplikasi oxygen concentrator dapat di simpulkan bahwa dari pengujian variasi massa adsorbent zeolite molecular sieve (ZMS) 13X yang dilakukan pada sistem pressure swing adsorption (PSA) untuk oxygen concentrator untuk pencapaian kemurnian oksigen paling baik berada pada kondisi 2 dengan nilai maksimal 81.5%.
Mechanical Properties Analysis of Stainless Steel 304 Linear Guide Rail Using Autodesk Inventor and MATLAB Azizi, Muhammad; Kurniawan, Kurniawan; Khaerudini, Deni Shidqi; Timuda, Gerald Ensang; Darsono, Nono; Chollacoop, Nuwong
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 7, No 1 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v7i1.25355

Abstract

This study investigates the mechanical properties of a stainless steel 304 linear guide rail using a combination of Autodesk Inventor and MATLAB. The primary objective is to analyze the von Mises stress distribution, displacement, and safety factor of the linear guide rail under varying load conditions, as well as to develop a model representing the relationship between stress and strain. A detailed 3D model of the guide rail was created using Autodesk Inventor, followed by finite element analysis (FEA) to evaluate stress and strain distribution across different sections of the rail. The simulation was conducted to assess the structural response under multiple loading scenarios, ensuring its reliability for real-world applications. Furthermore, a linear regression analysis was performed using MATLAB to establish a predictive model correlating stress and strain, enabling more accurate forecasting of the material's mechanical behavior. The results revealed that the maximum von Mises stress obtained from the simulation was 23.595 MPa, with a corresponding maximum displacement of 0.397 mm. The safety factor analysis confirmed the rail's structural integrity, with a minimum safety factor of 10.595, well above the failure threshold. These findings indicate that the linear guide rail meets the necessary mechanical performance requirements for its intended application.
Surface Modification of Hematite using Stearic Acid as Hydrophobic Inorganic Pigment Materials Iqbal, Rendy Muhamad; Agnestisia, Retno; Damsyik, Akhmad; Sinaga, Tiara Cristy Agatha; Khaerudini, Deni Shidqi; Wulandari, Ika Octavia; Susanti, Indri; Putra, Riandy; F. Adany
Jurnal Sains Materi Indonesia Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2025.8982

Abstract

The inorganic pigment is a material that determines the color of a paint that can be used as a coating material. Until now, the basic material for red pigment, namely hematite, has been imported to meet domestic needs. This study aims to develop a hematite-based inorganic pigment material from the mill-scale waste of PT Krakatau Steel by modifying the surface to be hydrophobic, making the pigmenting material resistant to acid attack and preventing peeling and corrosion of the material. The surface modification of hematite is carried out by reacting it with stearic acid into ethanol as a solvent. Hematite was immersed in a stearic acid solution with various concentrations of 2, 4, 6, and 8% for 6 hours; it was then separated by filtration and followed by the drying process. The hematite-stearic was characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR), scanning electron microscope (SEM), and water contact angle (WCA). The results show that the grafting process successfully changed the properties of hematite to hydrophobic. It is also supported by the FTIR spectrum due to the presence of molecular vibration of C-H, C=O, C-O, and Fe-O. Then, the higher contact angle is 150.474° for the stearic acid concentration of 6%.
Co-Authors Abdul Hamid Budiman Abu Bakar, Afarulrazi Ade Utami Hapsari Adhista Fania Adnan, Farrah Anis Fazliatun Afarulrazi Abu Bakar Aghni Ulma Saudi Agustanhakri, Agustanhakri Ahmad, Faozan Aiman Sajidah Abd Aziz Akhiruddin Maddu Andhika Prima Prasetyo Andi Firdaus Sudarma Andrameda, Yurian Ariandi Anggito Pringgo Tetuko Annisa Azzahra Arif Hidayat Arif Tjahjono Arif Tjahjono Arif Tjahjono Asadullah, Masud Azizi, M Azizi, Muhammad Bambang Mulyanto Bambang Mulyanto Chollacoop, Nuwong Dafit Feriyanto Damisih Damisih Damisih, Damisih Damsyik, Akhmad Dani Tri Wahyudi Dani Tri Wahyudi Desi Fajarwati Destyorini, Fredina Dianta Ginting Djajadiwinata, Eldwin Dwi Pudjisusilo, Raden Edy Herianto Majlan F. Adany Fajar Arif Kurniawan Fira Rizky Firdaus, Andi Fitri Suryani Arsyad Fredina Destyorini Friliandita, Vivi Gea, Markus Gerald Ensang Timuda Gumelar, Muhammad Dikdik Hanif Yuliani Hapsari, Ade Utami Hardhienata, Hendradi Hardi Gunawan Hardiansyah, Andri Henry Widodo Husin, Saddam Ilham Nur Dimas Yahya Indayaningsih, Nanik Indri Susanti Indriyati Indriyati Iqbal, Rendy Muhamad Irmawati, Yuyun Isnaeni Isnaeni Jarot Raharjo Jarot Raharjo Kurniawan Kurniawan Lukman Faris Nurdiyansah Marcelinus Christwardana Mardiyati, Mardiyati Masno Ginting Muhamad Fitri Muljadi Muljadi Muljadi Muljadi Nada Hashida Lathifah Nafisah, Sayyidatun Nanik Indayaningsih Nisya Ulmiah Nofrijon Sofyan, Nofrijon Nono Darsono Nono Darsono, Nono Octaviani, Ana Nur Oka Pradipta Arjasa Oka Pradipta Arjasa Oktaviani, Ana Nur Pandriana, Aap Perdamean Sebayang Permono Adi Putro Pratama, Wisnu Pravitasari, Retna Deca Pudjiwati, Sri Putra, Yunata Mandala Retna Deca Pravitasari Retno Agnestisia Riandy Putra Rifai, Abdulloh Rike Yudianti Robi Suherman Sabilly Handi Pradana Safaat, Mukhtar Sagir Alva Sanusi, Yasa Saptari, Sitti Ahmiatri Saputra, Dita Adi Saudi, Aghni Ulma Simanjutak, Elfrida Roulina Simarmata, Sari Namarito Sinaga, Tiara Cristy Sinaga, Tiara Cristy Agatha Slamet Priyono SRI RAHAYU Susilo, R Dwi Pudji Taqwatomo, Galih Tarigan, Kontan Tasomara, Riesma Teguh Imam Prasetya Tommy Martin Syauta Triyanto Pangaribowo Vivi Friliandita Wahyu Mulyo Utomo Wahyu Mulyo Utomo Wahyu Tri Utami Wahyudi, Dani Tri Widodo, Aditya Putra Widodo, Henry Wulandari, Ika Octavia Yuliani, Hanif Yuyun Irmawati Yuyun Irmawati