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1st International Conference of chemistry 2018, ICCHEM 2018

作者： Febiana, H. Partana, C.F. Wiyarsi, A. Sulistyo, B. Study Program of Chemistry Education Faculty of Mathematics and Natural Sciences Universitas Negeri Yogyakarta Indonesia Chemistry Education Department Faculty of Mathematics and Natural Science Universitas Negeri Yogyakarta Indonesia Automotive Engineering Education Department Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

The research purposed to analyze the characteristics of chemistry module on acid-base and electrochemistry topic based on vehicle context, to analyze the feasibility of module according to chemistry learning experts and to analyze the response of chemistry teachers and students of Automotive engineering program (AEP) about this module. This research using mixed methods and exploratory model design. The data collected from expert validation sheets also teachers and students response questionnaire. Technique of data analysis begins by converting qualitative data into quantitative data using Likert scales. Furthermore, the total and average score of each component can be determined from the quantitative data. The result of the average scores were converted into qualitative feasibility criteria according to the rating category. The product of the development was a chemistry module on acid-base and electrochemistry topic based on vehicle context for students in AEP. The experts considered feasibility of the module. This module had assessed by 5 teachers and 10 students. The module assessed by teachers showed a very good response while the module assessed by students showed a good response. Therefore, this module is feasible and can be used as a learning resource for students of AEP to enhance quality of chemistry learning. © Published under licence by IOP Publishing Ltd.

关键词： Students

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Justification on cyclopropene to propyne isomerization pathway based on vibrational calculations 4

Justification on cyclopropene to propyne isomerization pathw...

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4th Padjadjaran International Physics Symposium 2019, PIPS 2019

作者： Madinah, R. Rusydi, F. Boli, L.S.P. Khoirunisa, V. Fahmi, M.Z. Zaidan, A.H. Research Center for Quantum Engineering Design Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia Engineering Physics Study Program Institut Teknologi Sumatera Lampung35365 Indonesia Department of Chemistry Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya60115 Indonesia

We report a density-functional coupled with vibrational calculation on justifying the isomerization pathway of cyclopropene to propyne. The idea is to present the pathway in energy level diagram which the transition state is ensured by tracking a particular mode that supports the cyclic bond breaking and triple bond formation to occur. This mode decreases along the pathway and disappears at the transition state. To verify the designed pathway, the activation energy of the isomerization is used to find the rate constant with respect to experimental data at 500 K and 700 K by using transition state theory (TST). At those temperatures, TST predicts the rate constant at the same order of magnitude with the experimental result. It shows that the trend between calculation and experimental data is qualitatively in a good agreement, which implies that the designed pathway is justified. Furthermore, this study can be used as a guide if one needs to construct an isomerization pathway. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Rate constants

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study on the waste valve's stroke to water hammer pressure and flow patterns in a hydraulic ram pump

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AIP Conference Proceedings 2023年第1期2568卷

作者： I. P. Widiarta M. Suarda I. G. K. Sukadana M. Sucipta N. M. Suantini I. N. Suweden 1Student at Master Study Program of Mechanical Engineering Faculty of Engineering Udayana University Denpasar Bali Indonesia 2Mechanical Engineering Department Faculty of Engineering Udayana University Denpasar Bali Indonesia 3Chemistry Department Faculty of Mathematics and Natural Science Udayana University Denpasar Bali Indonesia 4Electrical Engineering Department Faculty of Engineering Udayana University Denpasar Bali Indonesia

The pressure in the hydraulic ram pump increases due to a sudden cessation of flow out through the waste valve when the waste valve is closing. The increasing of water hammer pressure is strongly influenced by velocity of the water flow in the drive pipe. Therefore, the waste valve has an important role in mechanism of the occurrence of water hammer pressure, performance, and flow patterns in the hydraulic ram pump. This study investigated the water hammer pressure and the flow patterns in the hydraulic ram pump that has been installed at Bon sub-village, as well as its performance at various strokes of the waste valve. In addition, CFD simulation using Ansys Fluent was conducted. The result show that increasing stroke of the waste valve increase the water velocity in the drive pipe and the water hammer pressure, and the optimum of the waste valve stroke has been predicted subject to volumetric and total efficiency using the equation of their trendlines. Furthermore, the flow patterns such as vortex, split flow, and blockage mass in the hydraulic ram pump have been identified.

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Effect of polyvinylidene fluoride concentration in PVDF-TiO₂-PVP composite membranes properties and its performance in bovine serum albumin rejection

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Case Studies in Chemical and Environmental engineering 2024年 9卷

作者： Gayatri, Rianyza Fizal, Ahmad Noor Syimir Yuliwati, Erna Zailani, Muhamad Zulhilmi Jaafar, Juhana Hossain, Md Sohrab Zulkifli, Muzafar Taweepreda, Wirach Ahmad Yahaya, Ahmad Naim Polymer Science Program Division of Physical Science Faculty of Science Prince of Songkla University Hat-Yai Songkhla 90110 Thailand Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Alor Gajah Melaka 78000 Malaysia Centre for Sustainability of Ecosystem & Earth Resources (Pusat ALAM) Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob Pahang Gambang 26300 Malaysia Program Study of Chemical Engineering Faculty of Engineering Universitas Muhammadiyah Palembang Jalan A.Yani 13 Ulu Kota Palembang 30263 Indonesia Advanced Membrane Technology Research Centre (AMTEC) Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor Skudai 81310 Malaysia HICoE-Centre for Biofuel and Biochemical Research Institute of Self-Sustainable Building Department of Fundamental and Applied Sciences Universiti Teknologi PETRONAS Perak Darul Ridzuan Seri Iskandar 32610 Malaysia Green Chemistry and Sustainability Cluster Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and BioEngineering Technology Alor Gajah Melaka 78000 Malaysia

In the present study, the polyvinylidene fluoride (PVDF) was incorporated with polyvinylpyrrolidone (PVP) and titanium dioxide (TiO2) nanoparticles to prepare PVDF-TiO2-PVP composite membrane for Bovine Serum Albumin ... 详细信息

In the present study, the polyvinylidene fluoride (PVDF) was incorporated with polyvinylpyrrolidone (PVP) and titanium dioxide (TiO₂) nanoparticles to prepare PVDF-TiO₂-PVP composite membrane for Bovine Serum Albumin (BSA) rejection from protein contaminated wastewater. The preparation of PVDF-TiO₂-PVP composite membrane was conducted by a non-solvent phase inversion (NIPS) process with varying PVDF weight percentages ranging from 16 to 19 wt%. The polymer concentration plays a critical role in the formation of composite membranes that is commonly overlooked. The primary goal of this study is to examine how the concentration of polymers affects the process of membrane creation, the ensuing structure, and the properties of these membranes. Presently, there is a restricted comprehension concerning the impact of PVDF polymer concentration in the fabrication of membranes using the NIPS approach, particularly for PVDF-TiO₂-PVP composite membranes. FE-SEM analysis revealed the lowest skin layer thickness and the number of macro-void formations in a PVDF composite membrane were at 16 wt% PVDF, compared to composite membranes over higher PVDF concentrations from 17 to 19 wt%. There were only slight variations in the percentages of individual elements across all PVDF-TiO₂-PVP membranes, yet the values were identical for C, O, F, and Ti. The viscosity was lowest at 16 wt percent PVDF (576.5 MPa s) and greatest at 19 wt percent PVDF (2054.3 MPa s). It showed that 19%wt PVDF viscosity increased fourfold higher than 16%wt. As the concentration of PVDF was increased, a related decrease in the surface porosity of the membrane was observed. The highest hydrophobicity with the contact angle of 79.62° of the composite membranes were detected at 19 wt% of PVDF loading. The maximum water flux (265.43 L/m²h) and BSA flux (250.31 L/m²h) were obtained at 19 wt% of PVDF loading. The lowest PVDF concentration of 16

关键词： Bovine serum albumin rejection Composite membrane Flat sheet Membrane separation Polymeric composite

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Biomass waste as an alternative source of carbon and silicon-based absorbents for CO2 capturing application

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Chemosphere 2023年 343卷

作者： Suresh, R. Gnanasekaran, Lalitha Rajendran, Saravanan Jalil, A.A. Soto-Moscoso, Matias Khoo, Kuan Shiong Ma, Zengling Halimatul Munawaroh, Heli Siti Show, Pau Loke Departamento de Ingeniería Mecánica Facultad de Ingeniería Universidad de Tarapacá Avda. General Velásquez 1775 Arica Chile University Centre for Research & Development Department of Mechanical Engineering Chandigarh University Punjab Mohali140413 India Department of Chemical Engineering Lebanese American University Byblos Lebanon Centre of Hydrogen Energy Institute of Future Energy Johor UTM Johor Bahru81310 Malaysia Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor UTM Johor Bahru81310 Malaysia Universidad Autónoma de Chile Chile Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Taiwan Centre for Herbal Pharmacology and Environmental Sustainability Chettinad Hospital and Research Institute Chettinad Academy of Research and Education Tamil Nadu Kelambakkam603103 India Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou University Wenzhou325035 China Study Program of Chemistry Faculty of Mathematics and Science Education Universitas Pendidikan Indonesia Jalan Dr. Setiabudhi 229 Bandung40154 Indonesia Department of Chemical Engineering Khalifa University P.O. Box 127788 Abu Dhabi United Arab Emirates Department of Chemical and Environmental Engineering Faculty of Science and Engineering University of Nottingham Malaysia Jalan Broga Selangor Darul Ehsan Semenyih Malaysia

The production of low-cost solid adsorbents for carbon dioxide (CO2) capture has gained massive consideration. Biomass wastes are preferred as precursors for synthesis of CO2 solid adsorbents, due to their high CO2 adsorption efficiency, and ease of scalable low-cost production. This review particularly focuses on waste biomass-derived adsorbents with their CO2 adsorption performances. Specifically, studies related to carbon (biochar and activated carbon) and silicon (silicates and geopolymers)-based adsorbents were summarized. The impact of experimental parameters including nature of biomass, synthesis route, carbonization temperature and type of activation methods on the CO2 adsorption capacities of biomass-derived pure carbon and silicon-based adsorbents were evaluated. The development of various enhancement strategies on biomass-derived adsorbents for CO2 capture and their responsible factors that impact adsorbent's CO2 capture proficiency were also reviewed. The possible CO2 adsorption mechanisms on the adsorbent's surface were highlighted. The challenges and research gaps identified in this research area have also been emphasized, which will help as further research prospects. © 2023 Elsevier Ltd

关键词： Carbon dioxide

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Analysis of land requirements of Temesi final disposal facility, Gianyar Regency with 3R waste management scenario

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IOP Conference Series: Earth and Environmental Science 2021年第1期623卷

作者： G A W Sudiartha I W B Suyasa Environmental Engineering Study Program Faculty of Engineering Universitas Udayana Indonesia Laboratory of Environmental Chemistry Faculty of Mathematics and Sciences Universitas Udayana Indonesia

Based on waste generation projection in 2040, the total waste generation in Gianyar Regency was approximately about 1,208.88 m3/day from a total occupant of 593,436 inhabitants in Gianyar Regency. The existing supporting capacity of Temesi Final Disposal (Temesi Landfill) was 51,500 m3; meanwhile, the total waste generation in Gianyar Regency in 2020 is up to 146,356 m3 consequently Temesi Landfill was overloaded by untreated solid waste since 2020. To reduce waste generation and decrease the treatment burden in Temesi Landfill, solid waste management using 3R methods from household clusters needs to be applied. Using 3R concept, eventually, the waste generation that is disposed into Temesi Landfill can be reduced significantly by 63%, from 1,208.88 m3/day into 446 m3/day with a total weight of 148 tonne/day in 2040. Within the 3R waste management from households, the land requirement could be reduced to only 1.08 Ha in 2020 and 14.35 Ha in 2040 from previously about 3 Ha and 39 Ha. Within the forecast results, it is concluded that the upstream 3R scenario has a significant impact on reducing waste generation; thus, it will also lead to fewer landfill area demands.

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Systems thinking on renewable energy: A bibliometric analysis

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AIP Conference Proceedings 2023年第1期2734卷

作者： Dindin Nasrudin Agus Setiawan Dadi Rusdiana Liliasari Science Education Doctoral Program Universitas Pendidikan Indonesia Bandung Indonesia Physics Education Study Program UIN Sunan Gunung Djati Bandung Indonesia Department of Mechanical Engineering Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Physics Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Chemistry Education Universitas Pendidikan Indonesia Bandung Indonesia

Energy is a systematic problem involving many fields and disciplines. Discourse about it requires systems thinking. This research aims to reveal trends and future work related to system thinking on renewable energy. The method used is a bibliometric analysis of the Scopus database using VOSviewer software. Through the selection process, 284 documents deemed relevant were selected from journal articles and conference proceedings. Through VOSviewer analysis, 4 clusters of related keyword groups are shown. Four very influential words in this research theme are systems theory with 224 occurrences, renewable energy resources with 142 occurrences, renewable energy with 112 occurrences, and system dynamics with 102 occurrences. Through network visualization, the relationship between concepts both within one cluster and between clusters is shown. The visualization overlays is used as a basis of mapping the future work related to system thinking on renewable energy which include renewable energy resources, system theory, system dynamics, alternative energy, sustainable development, decision making, and renewable energy technology. This study concludes that bibliometric analysis through VOSviewer is proven to be able to show trends and future work for systems thinking on renewable energy research.

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Critical pore radius and transport properties of disordered hard- and overlapping-sphere models

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Physical Review E 2021年第1期104卷 014127-014127页

作者： Michael A. Klatt Robert M. Ziff Salvatore Torquato Department of Physics Princeton University Princeton New Jersey 08544 USA Institut für Theoretische Physik FAU Erlangen-Nürnberg Staudtstr. 7 91058 Erlangen Germany Center for the Study of Complex Systems and Department of Chemical Engineering University of Michigan Ann Arbor Michigan 48109 USA Department of Chemistry Princeton Institute for the Science and Technology of Materials and Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA

Transport properties of porous media are intimately linked to their pore-space microstructures. We quantify geometrical and topological descriptors of the pore space of certain disordered and ordered distributions of spheres, including pore-size functions and the critical pore radius δc. We focus on models of porous media derived from maximally random jammed sphere packings, overlapping spheres, equilibrium hard spheres, quantizer sphere packings, and crystalline sphere packings. For precise estimates of the percolation thresholds, we use a strict relation of the void percolation around sphere configurations to weighted bond percolation on the corresponding Voronoi networks. We use the Newman-Ziff algorithm to determine the percolation threshold using universal properties of the cluster size distribution. The critical pore radius δc is often used as the key characteristic length scale that determines the fluid permeability k. A recent study [Torquato, Adv. Wat. Resour. 140, 103565 (2020)] suggested for porous media with a well-connected pore space an alternative estimate of k based on the second moment of the pore size 〈δ2〉, which is easier to determine than δc. Here, we compare δc to the second moment of the pore size 〈δ2〉, and indeed confirm that, for all porosities and all models considered, δc2 is to a good approximation proportional to 〈δ2〉. However, unlike 〈δ2〉, the permeability estimate based on δc2 does not predict the correct ranking of k for our models. Thus, we confirm 〈δ2〉 to be a promising candidate for convenient and reliable estimates of the fluid permeability for porous media with a well-connected pore space. Moreover, we compare the fluid permeability of our models with varying degrees of order, as measured by the τ order metric. We find that (effectively) hyperuniform models tend to have lower values of k than their nonhyperuniform counterparts. Our findings could facilitate the design of porous media with desirable transport properties via targete

关键词： Geophysical networks Materials Patterns in complex systems

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Composing and characterization of barium strontium titanate film doped with carbon dot

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AIP Conference Proceedings 2024年第1期3027卷

作者： Irzaman Kenji Rizki Mayfarah Mahfuddin Zuhri Heriyanto Syafutra Noviyan Darmawan Erdiansyah Pratama Ridwan Siskandar Departement of Physics IPB University Bogor West Java 16680 Indonesia Departement of Chemistry IPB University Bogor West Java 16680 Indonesia PT. Global Pratama Powerindo Bandung West Java 40614 Indonesia Computer Engineering Study Program College of Vocational Studies IPB University Bogor West Java 16151 Indonesia

Barium Strontium Titanate (BaSrTiO3) film which was captured by carbon dot with variation container 0%, 2%, 4%, 6% using CSD method with the help of spin coating with a rotating speed of 8000 rpm has been successfully made on p-type silicon substrate 100. The film was annealed at 850 °C and held for 8 hours. Barium Strontium Titanate (BaSrTiO3) film at a concentration 0%, 2%, 4%, 6% carbon dot characterized by UV-VIS, XRD, SEM-EDX to produce bandgap energy in sequence 2.72 eV; 2.85 eV; 3.7 eV and 3.8 eV. The result of XRD characterization showed that the BST lattice structure is a cube with lattice parameters a=b=c in sequence of 4.066945 Å; 4.06868 Å; 4.072155 Å and 4.077379 Å. The result of SEM-EDX characterization showed that in the surface morphology of BST film the grain size was quite homogeneous and the corresponding atomic compositions obtained were Ba, Sr, Ti, O, and C

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Antioxidant compounds of leaves and seeds extracts of Parkia Speciosa overcome ferroptosis

Food Chemistry Advances

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Food chemistry Advances 2025年 7卷

作者： Nopiyanti, Elsa Safithri, Mega Trivadila Sahidin Kuspradini, Harlinda Earnestly, Femi Hirata, Yoko Takemori, Hiroshi Batubara, Irmanida Department of Chemistry Chemistry Post-graduate Program Bogor Agricultural University West Java Bogor Indonesia Department of Biochemistry Chemistry Post-graduate Program Bogor Agricultural University West Java Bogor Indonesia Department of Pharmacy Faculty of Pharmacy Universitas Halu Oleo Kendari Indonesia Faculty of Forestry Universitas Mulawarman Samarinda East Kalimantan Indonesia Faculty of Pharmacy Muhammadiyah University of Sumatera Barat West Sumatera Padang Indonesia Life Science Research Center Institute for Advanced Study Gifu University Gifu Japan Department of Chemistry and Biomolecular Science Faculty of Engineering Gifu University Gifu Japan Tropical Biopharmaca Research Center IPB University West Java Bogor Indonesia

Parkia speciosa seeds, a widely consumed plant in Southeast Asia, are known for their rich bioactive compounds with potential health benefits. This study investigates the antioxidant properties of ethanol extracts from P. speciosa leaves (PSL) and seeds (PSS) to combat oxidative stress. Antioxidant activity was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays, revealing that PSL exhibited higher antioxidant potential than PSS, with values of 14.34 ± 0.02 and 19.39 ± 0.04 μg ascorbic acid equivalent (AAE)/g extract, respectively. The ethanol extracts of PSL and PSS significantly protected HT22 cells from erastin-induced ferroptotic cell death and activated the antioxidant response element (ARE) pathway, enhancing endogenous antioxidant defense mechanisms. Furthermore, in silico molecular docking analysis identified 7,7′-Dihydroxy-5′‑methoxy-2′,2′-dimethyl-4-oxo-3′,4′-dihydro-2′H,4H-3,6′-bichromen-5-yl hexopyranosiduronic acid as a promising bioactive compound with strong binding affinities to oxidative stress-related receptors (5i6x, 6cm4, 2f8a, 8bxn, and 8ivr). These findings suggest that P. speciosa ethanol extract, particularly from its leaves, exhibits strong antioxidant and neuroprotective properties, supporting its potential application as a natural therapeutic agent for oxidative stress-related disorders. © 2025 The Authors

关键词： 7,7′-Dihydroxy-5′-methoxy-2′2′-dimethyl-4-oxo-3′4′-dihydro-2′H 4H-3 6′-bichromen-5-yl hexopyranosiduronic acid antioxidant response element Ferroptosis, P. speciosa HT22 cells

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