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Heterogeneous catalytic oxidative desulfurization of dibenzothiophene of metal oxide–Mg/Al layered double hydroxide

Environmental Science and Pollution Research 2025年第13期32卷 8555-8563页

作者： Ahmad, Nur Hanifah, Yulizah Arsyad, Fitri Suryani Lesbani, Aldes Graduate School of Mathematics and Natural Sciences Faculty of Mathematics and Natural Sciences Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia Research Center of Inorganic Materials and Coordination Complexes Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia Research Center for Chemistry National Research and Innovation Agency Building 452 KST BJ Habibie Banten Serpong Tangerang Selatan15311 Indonesia Master Program of Material Science Graduate School Universitas Sriwijaya Sumatera Selatan Palembang30139 Indonesia

Mg/Al-TiO2 and Mg/Al-ZnO were successfully prepared for dibenzothiophene catalytic oxidative desulfurization. XRD, FTIR, TEM, and BET analyses were utilized to characterize the catalyst. In composites, the distinctive XRD patterns of precursors are still observable. FTIR spectra of the absorption bands were at 3448, 1627, 1381, 601, and 547 cm−1. The TEM pictures of the sample also revealed the almost spherical and hexagonal platelets of Mg/Al-LDH and its composite. Mg/Al LDH, Mg/Al-TiO2, and Mg/Al-ZnO had typical pore sizes of 35.78 nm, 52.81 nm, and 38.37 nm, respectively. The graph of nitrogen isotherms Mg/Al LDH, Mg/Al-TiO2, and Mg/Al-ZnO followed type IV isotherms. In addition, the conversion rates on Mg/Al-ZnO, Mg/Al-TiO2, ZnO, Mg/Al-LDH, and TiO2 were 99.34%, 99.50%, 91.20%, 96.29%, and 88.06%, respectively. This work presents alternative materials for the oxidative desulfurization of dibenzothiophene in practical applications. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Zinc oxide

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Properties of Standard, Fuzzy, and Self-interacting Dark Matter Haloes in Dwarf Galaxies

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Research in Astronomy and Astrophysics 2025年第04期 196-210页

作者： Fahmi M.Al Farisy Hesti R.T.Wulandari Azriel J.Dante Master's Program in Astronomy Faculty of Mathematics and Natural SciencesInstitut Teknologi Bandung Astronomy Research Division Faculty of Mathematics and Natural SciencesInstitut Teknologi Bandung Bosscha Observatory Faculty of Mathematics and Natural SciencesInstitut Teknologi Bandung

This study examines the properties of standard cold dark matter(CDM), fuzzy dark matter(FDM), and selfinteracting dark matter(SIDM) haloes by analyzing the rotation curves of selected dwarf galaxies from SPARC and LITTLE THINGS in 3D catalogs. Utilizing the Markov Chain Monte Carlo(MCMC) method for model fitting and Bayesian Information Criterion for model comparison, we find that compared to CDM, both FDM and SIDM haloes generally provide better fits to the observed rotation curves. Our findings reveal that the concentration–mass relation derived from the dark matter-only simulations is not followed by concentrations or masses obtained from the rotation curve data. Our analysis highlights a positive correlation between the core sizes of FDM and SIDM haloes and the effective radius of the galaxy, attributable to gravitational couplings between baryonic and dark matter components. Moreover, our exploration of dark matter fractions at characteristic radii indicates considerable diversity in dark matter distributions across dwarf galaxies. Notably, FDM and SIDM exhibit greater diversity than CDM in this respect.

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Synergetic effects of multiple junction and surface hydroxyl in Cu/CuO/Cu2O/TiO2 heterostructures towards highly efficient photocatalysts for hydrogen generation

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Materials Science for Energy Technologies 2025年 8卷 131-142页

作者： Subagyo, Riki Anindika, Garcelina Rizky Aufkani, Afif Akmal Zhang, Lei Ardhyananta, Hosta Burhan, R.Y. Perry Nugraheni, Zjahra Vianita Akhlus, Syafsir Bahruji, Hasliza Prasetyoko, Didik Wellia, Diana Vanda Ivansyah, Atthar Luqman Arramel Kusumawati, Yuly Department of Chemistry Faculty of Science and Analytic Data Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten15314 Indonesia Department of Physics National University of Singapore Singapore117551 Singapore Department of Materials and Metallurgical Engineering Faculty of Industrial Technology and Systems Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Padang25163 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha No.10 West Java Bandung40132 Indonesia

The implementation of titanium dioxide (TiO2) as a photocatalyst material in hydrogen (H2) evolution reaction (HER) has embarked renewed interest in the past decade. Rapid electron-hole pairs recombination and wide band gap of a photo-sensitive material of TiO2 are detrimental toward the targeted catalytical reaction. In this study, we present the rational design, fabrication, photocatalytic performance of TiO2-Cu/CuO/Cu2O heterostructures (CuTi) using viable chemical reduction method. The Z-scheme and S-scheme are succesfully generated across the TiO2/CuO/Cu2O interfaces, while the Schottky junction arises on the Cu perimeters. This is evidenced from the blue shifted about 0.3 eV of Cu 2p core level determined by using X-ray photoemission spectroscopy (XPS), in combination with the formation of inverse V-shape of the Mott-Schottky plots. In addition, we find that Cu/CuO/Cu2O facilitates photon absorption range up to the visible region. The multiple heterojunction and the large number of OHsurface enhanced charge carrier transfer are associated to the suppression of photoluminescence (PL) intensity, high surface hydroxyl (OHsurface) density in CuTi probed by XPS, and fast electron transfer based on the electrochemical measurements. The presence of OHsurface inhibits the recombination of electron. A significant H2 photogeneration rate enhancement is achieved when an optimized 5 wt% Cu/CuO/Cu2O concentration is used on TiO2 to achieve 7,157.19 μmol·g−1 (1,789.30 μmol·g−1·h−1). Based on this finding, zero emission energy innitiative could be materialized under multiple heterojunctions in photocatalytic process is beneficial for enhancing the H2 production. © 2025 The Authors

关键词： Titanium dioxide

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Evaluating nitrogen sources for enhanced halophilic bacteria growth, electron transfer, and microbial fuel cell performance

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Chemosphere 2025年 378卷 144397页

作者： Christwardana, Marcelinus Khoirunnisa, K. Asy'ari, Mukhammad Hadiyanto, H. Department of Chemistry Faculty of Science and Mathematics Diponegoro University 50275 Indonesia Master Program of Energy School of Postgraduate Studies Diponegoro University 50241 Indonesia Research Collaboration Center for Electrochemistry BRIN – Diponegoro University 50275 Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University 50275 Indonesia

This study investigates the comparative effects of different nitrogen sources—peptone, tryptone, and bovine serum albumin (BSA)—on the growth, electron transport mechanisms, and MFCs performance of halophilic bacteria Bacillus clausii J1G-o%B. The objective is to identify the most effective nitrogen source for optimizing bacterial growth and enhancing MFC efficiency. Comprehensive analysis reveals that tryptone and peptone significantly enhance bacterial growth and stability compared to BSA. Increased concentrations of these nitrogen sources correlate with elevated ammonia production and notable pH changes, indicating heightened metabolic activity. The non-linear relationship between scan rate and current density suggests diffusion-limited redox reactions. Notably, higher tryptone concentrations significantly increase the electron transfer rate constant to 3.66 ± 0.02 s−1 when the concentration increases to 0.1 g/100 mL. Early voltage increases at around the 30th hour to 0.175 V under the T-0.1 condition further support the critical role of tryptone in accelerating bacterial growth and biofilm formation. Cyclic voltammetry experiments demonstrate that nitrogen source type and concentration influence electrical double layer characteristics. These findings underscore the potential of tryptone to optimize Bacillus clausii electrochemical performance, achieving a maximum power density of 36.93 mW/m2 at a current density of 196 mA/m2, paving the way for bioelectrochemical system applications. © 2025 Elsevier Ltd

关键词： Rate constants

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Determination of the tourist route in Malang Raya by using ant colony optimization 21st

Determination of the tourist route in Malang Raya by using a...

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21st IFAC World Congress 2020

作者： Rozidi, A. Anam, S. Habibah, U. Master of Mathematics Study Program Mathematics Department Brawijaya University Indonesia

Malang Raya is one of the most popular tourist destinations in Indonesia and has many interesting tourist attractions. Tourists need much time to visit all the tourist attractions. It is not possible to visit all the tourist attractions since vacation time is limited. Therefore, the method for determining the tourist route with the minimum time and satisfy the constraint is needed. The problem is Vehicle Routing Problem (VRP) and can be solved by meta-heuristic. There are several meta-heuristics that can be used to solve VRP, for example Genetic Algorithm (GA), Particle Swarm Optimization (PSO), and Ant Colony Optimization (ACO). ACO has the advantage of a good positive feedback mechanism when compared to GA and PSO. For this reasons, this paper presents the determination of tourist route in Malang Raya by using ACO. However, ACO tends to solution stagnation. In this paper, the solution stagnation of ACO will be solved by applying the dual pheromone tables. The results show that ACO with dual pheromone tables can solve the problem of determining tourist routes in Malang Raya well in terms of quality of solution because ACO with dual pheromone tables can obtain better results in the time cost of the route than standard ACO. © Published under licence by IOP Publishing Ltd.

关键词： Ant colony optimization

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Modeling coronary heart disease risk based on age, fatty food consumption and anxiety factors using penalized spline nonparametric logistic regression

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MethodsX 2025年 14卷 103320页

作者： Chamidah, Nur Lestari, Budi Susilo, Hendri Dewi, Triana Kesuma Saifudin, Toha Al Akhwal Siregar, Naufal Ramadhan Aydin, Dursun Department of Mathematics Faculty of Science and Technology Airlangga University Surabaya 60115 Indonesia Research Group of Statistical Modeling in Life Science Faculty of Science and Technology Airlangga University Surabaya 60115 Indonesia Department of Mathematics Faculty of Mathematics and Natural Sciences The University of Jember Jember 68121 Indonesia Department of Cardiology and Vascular Medicine Faculty of Medicine Airlangga University Surabaya 60286 Indonesia Department of Psychology Faculty of Psychology Airlangga University Surabaya 60286 Indonesia Mathematics Master Study Program Department of Mathematics Faculty of Science and Technology Airlangga University Surabaya 60115 Indonesia Department of Statistics Faculty of Science Muğla Sıtkı Koçman University Muğla 48000 Turkey Research Scholar at Department of Mathematics University of Wisconsin Oshkosh Algoma Blvd Oshkosh 54901 WI United States

Coronary Heart Disease (CHD) represents a significant public health challenge in Indonesia, contributing substantially to morbidity and mortality rates. We propose a new method for modeling CHD risk by considering the influencing factors, namely age, fatty food consumption and anxiety using Penalized Spline Nonparametric Logistic Regression (PSNLR) approach to analyze the CHD and non-CHD risks affected by these influencing factors. The proposed method gave results a percentage of model classification accuracy of 94.31 % and the value of area under the receiver operating characteristic curve (AUC) of 0.96. This means that the proposed method is a powerful method in modeling the CHD risk and it can effectively identify the nonlinear relationship between influencing factors and CHD incidence. This research supports the achievement of Sustainable Development Goals (SDGs) point 3, especially the target of reducing deaths from non-communicable diseases such as CHD through improving disease prevention and treatment. The use of more accurate models in identifying risk factors also contributes to efforts to improve overall public health and strengthen health care systems. • A cross-sectional survey on influencing factors of CHD risk was conducted at the Airlangga University Hospital. • For analyzing relationship between influencing factors and CHD risk, we used PSNLR method. © 2025

关键词： Age Anxiety Coronary heart disease Fatty food consumption Nonparametric logistic regression Penalized spline

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Improving high school students' critical thinking ability in linear programming through problem based learning assisted by GeoGebra 1

Improving high school students' critical thinking ability in...

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1st South East Asia Science, Technology, Engineering and mathematics International Conference, SEA- STEM 2020

作者： Rahman, O. Usman Johar, R. Master of Mathematics Education Study Program Syiah Kuala University Aceh Indonesia

Critical thinking is one of the important abilities in learning mathematics, but the fact shows most high school students in Aceh have not developed the thinking skill yet. One of the causes is the mathematics learning that is carried out does not pay attention to critical thinking skills. This study aims to determine the increase in students' critical thinking skills in linear programming learning through the Problem Based Learning (PBL) model assisted by GeoGebra Software in SMA Negeri 2 Teupah Barat. This research is a semi-experimental study with one group pre-test post-test design. The population in this study were all 24 students of class XI at SMA Negeri 2 Teupah Barat. A sample of 10 students was selected using the purposive sampling technique. The instrument used was the pre-test and post-test questions on critical thinking skills. The data were analyzed using SPSS 25 software including data description, normality test, paired sample t-test, and N-Gain score. The results showed that the use of the PBL model assisted by GeoGebra software can improve students'critical thinking skills on linear programming material at SMA Negeri 2 Teupah Barat with an average increase in students' critical thinking skills of 50.05%, a minimum increase of 36.53% and a maximum increase of 63.57%. © Published under licence by IOP Publishing Ltd.

关键词： Students

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Phytochemistry and antimicrobial potential of off-grade white pepper (Piper nigrum L.) essential oils extracted using microwave-assisted hydro-distillation (MAHD)

Current Research in Green and Sustainable Chemistry

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Current Research in Green and Sustainable Chemistry 2025年 10卷

作者： Nurjanah, Sarifah Widyaningrum, Sekar Nurhadi, Bambang Rosalinda, S. Rienoviar Permadi, Nandang Julaeha, Euis Department of Agricultural and Biosystem Engineering Faculty of Agro-Industrial Technology Universitas Padjadjaran Jatinangor 45363 Indonesia Agroindustrial Technology Master's Program Faculty of Agro-Industrial Technology Universitas Padjadjaran Jatinangor 45363 Indonesia Department of Food Technology Faculty of Agro-Industrial Technology Universitas Padjadjaran Jatinangor 45363 Indonesia Research Center for Agroindustry National Research and Innovation Agency Bogor 16911 Indonesia Doctorate Program in Biotechnology Universitas Padjadjaran Bandung 40132 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jatinangor 45363 Indonesia

White pepper generally used as spice, has the main component of piperine which gives it a spicy taste and essential oils that determine its aroma. In general trade, only good pepper is traded, while off-grade that does not meet quality requirements will be wasted. This study aims to investigate the effect of extraction methods of essential oils from off-grade white pepper and the potential of its antimicrobial activity against pathogenic bacteria. The results showed that off-grade white pepper essential oils (WPEO) could be isolated by using microwave-assisted hydro-distillation (MAHD) and hydro-distillation (HD). Essential oils produced had physicochemical characteristics in accordance with the ISO 3061:2008 standard. Specifically, MAHD off-grade, MAHD grade-A, and HD WPEO had 13, 11, and 15 components, respectively. The chemical composition showed that all the extracted EO contained the main components of caryophyllene, (+)-3-carene, D-limonene, and β-pinene. The methods showed the extraction ability of monoterpene hydrocarbons by MAHD and sesquiterpene hydrocarbons by HD. In comparison, microwave-extracted essential oils had a higher limonene, while off-grade WPEO contained (+)-3-carene. The FTIR results confirmed the content of the components in the three WPEO that were investigated. All essential oils had antibacterial activity against E. coli and S. typhimurium with zone inhibition values of MAHD off-grade WPEO, MAHD grade-A WPEO, and HD off-grade WPEO against E. coli at 15.44 ± 1.68 mm, 6.72 ± 0.59 mm, and 10.17 ± 0.29 mm, as well as against S. typhimurium at 8.72 ± 1.25 mm, 8.06 ± 0.86 mm, and 8.83 ± 0.87 mm, respectively. © 2025 The Authors

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The role of guidance and counseling teacher in solving students'learning difficulties in physics 5

The role of guidance and counseling teacher in solving stude...

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5th International Conference on mathematics, Science and Education 2018, ICMSE 2018

作者： Putra, D.J. Rahman, Z. Master Program in Physics Teaching Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Bandung Indonesia Master Program in Guidance and Counseling Faculty of Science Education Padang Indonesia

Physics is one of the subjects that are considered difficult, by most high school students taking the science stream in Indonesia. Tthere are many students who have difficulty in learning this subject. Moreover, physics is one of the important subject when students want to continue their education to first tier universities in *** overcome this problem, this paper presents a theory that can be used by Guidance and Counseling teachers in overcoming the difficulties learning physics. The theory developed in this study can be applied by the counsellor in helping the learning difficulties of the students. This theory was developed with the literature study method which was analyzed using analytical descriptive techniques with an inductive approach. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Students

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Analyzing mathematical creative thinking ability on sample space materials grade VIII SMP Kanisius Pakem 7

Analyzing mathematical creative thinking ability on sample s...

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7th South East Asia Design Research International Conference, SEADRIC 2019

作者： Nobilio Pasia Janu, Margaretha Wicaksono, Anung Master Stud. of Mathematics Education Study Program Sanata Dharma University Yogyakarta Indonesia

This study aimed to describe the learning process using problem-based learning for a sample space material and creative thinking ability while solving the problem. The subject of this study is 16 grade VIII students of SMP Kanisius Pakem. The instrument used in this study were observation sheet, Hypotethical Learning Trajectory (HLT) and the student's worksheet. The type of this research is design research. The result then can be classified, represented, and the conclusion can be drawn by comparing the result from the Student's Worksheet and indicators of mathematical creative thinking ability. The result of this study were using problem based learning is the mathematical creative thinking does not require student's answer to be correct, but more importantly that they have displayed some indicators of mathematical creative thinking while solving the problem. © Published under licence by IOP Publishing Ltd.

关键词： Students

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