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Bo-derived waste neem to enriching reinforced hybrid composite for environmental remediation

Chemosphere 2024年 350卷 141055页

作者： Anbuchezhiyan, Gnanasambandam Mubarak, Nabisab Mujawar Hussain Siddiqui, Muhammad Tahir Malafaia, Guilherme Abnisa, Faisal Department of Mechanical Engineering Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Tamil Nadu Chennai602105 India Petroleum and Chemical Engineering Faculty of Engineering Universiti Teknologi Brunei Bandar Seri BegawanBE1410 Brunei Department of Chemistry School of Chemical Engineering and Physical Sciences Lovely Professional University Punjab Jalandhar India Department of Chemical and Materials Engineering Faculty of Engineering King Abdulaziz University Rabigh21911 Saudi Arabia School of Engineering RMIT University MelbourneVIC3001 Australia Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia MG Uberlândia Brazil Laboratory of Toxicology Applied to the Environment Goiano Federal Institute – Urutaí Campus. Rodovia Geraldo Silva Nascimento 2 5 Km Zona Rural GO Urutaí Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás GO Goiânia Brazil

The utilization of natural fibres often entails a lesser environmental impact when compared to synthetic fibres. Biodegradable natural fibres minimize waste and pollution, and promote sustainability, but their weaker bonds limit their resilience. These issues can be addressed by customizing the composite's mechanical properties with natural and synthetic fibres. In this study, hybrid composites were created using the hand layup method with a novel dissimilar layer arrangement of neem (N), sisal (S), and glass (G) fibre and analyze its mechanical and thermal properties. Experimental observation shows that the GN composite had a higher maximum ultimate tensile strength of 26 N/mm2 than the GS, GNS, and GSN composites. The GN composite had a percentage elongation of 6.33%, similar to the percentage elongation of the GS composite (6.833%), and it also had a higher ultimate shear strength of 50 MPa. The composite GS absorbed 6.6 J energy, higher than the composites GN, GNS, and GNS, which absorbed 6.1 J, 4.5 J, and 4.5 J, respectively. The fractured surface's SEM images were obtained and analyzed for failure. The results demonstrated that the hybridization was effective, and better properties can be obtained by combining neem, sisal, and glass fiber, and it can be used for other requirements, including strength, weight, cost, and ecological impact. © 2024 Elsevier Ltd

关键词： Glass

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Transient rod-climbing in an Oldroyd-B fluid

arXiv

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arXiv 2025年

作者： Ruangkriengsin, Tachin Brandão, Rodolfo Wu, Katie Hwang, Jonghyun Boyko, Evgeniy Stone, Howard A. Program in Applied and Computational Mathematics Princeton University PrincetonNJ08544 United States School of Mathematics University of Bristol Fry Building Woodland Road BristolBS8 1UG United Kingdom Department of Mechanical and Aerospace Engineering Princeton University PrincetonNJ08544 United States Faculty of Mechanical Engineering Technion – Israel Institute of Technology Haifa3200003 Israel

The Weissenberg effect, or rod-climbing phenomenon, occurs in non-Newtonian fluids where the fluid interface ascends along a rotating rod. Despite its prominence, theoretical insights into this phenomenon remain limited. In earlier work, Joseph & Fosdick (Arch. Rat. Mech. Anal., vol. 49, 1973, pp. 321–380) employed domain perturbation methods for second-order fluids to determine the equilibrium interface height by expanding solutions based on the rotation speed. In this work, we investigate the time-dependent interface height through asymptotic analysis with dimensionless variables and equations using the Oldroyd-B model. We begin by neglecting surface tension and inertia to focus on the interaction between gravity and viscoelasticity. In the small-deformation scenario, the governing equations indicate the presence of a boundary layer in time, where the interface rises rapidly over a short time scale before gradually approaching a steady state. By employing a stretched time variable, we derive the transient velocity field and corresponding interface profile on this short time scale and recover the steady-state profile on a longer time scale. Subsequently, we reintroduce small but finite inertial effects to investigate their interplay with viscoelasticity and propose a criterion for determining the conditions under which rod-climbing occurs. © 2025, CC BY.

关键词： Non Newtonian liquids

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Improving dye-sensitized solar cell longevity: An aerogel encapsulation approach

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Journal of the Taiwan Institute of Chemical Engineers 2025年 174卷

作者： Mahalingam, Savisha Manap, Abreeza Lau, Kam Sheng Floresyona, Dita Chia, Chin Hua Afandi, Nurfanizan Chelvanathan, Puvaneswaran Arith, Faiz Nugroho, Agung Institute of Sustainable Energy Universiti Tenaga Nasional Jalan IKRAM-UNITEN Selangor Kajang43000 Malaysia Materials Science Program Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Department of Chemical Engineering Faculty of Industrial Technology Universitas Pertamina Jalan Teuku Nyak Arief Simprug Kebayoran Lama Jakarta 12220 Indonesia Department of Mechanical Engineering College of Engineering Universiti Tenaga Nasional Jalan IKRAM-UNITEN Kajang43000 Malaysia Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Faculty of Electronics and Computer Technology and Engineering Universiti Teknikal Malaysia Melaka Hang Tuah Jaya Durian Tunggal Melaka 76100 Malaysia

The primary challenge in dye-sensitized solar cells (DSSCs) is electrolyte leakage, compromising long-term stability and performance. Alternative electrolytes and encapsulation strategies have been explored to address this. In this study, we propose using nitrogen, fluorine, and sulfur-doped reduced graphene oxide (NSF-rGO) aerogel as an electrolyte encapsulator within DSSCs. The NSF-rGO aerogel was synthesized using a one-pot hydrothermal technique and serves to trap the liquid electrolyte, enhancing cell stability while maintaining conductivity. Although the initial power conversion efficiency of the NSF-rGO-based DSSC was lower than that of the conventional DSSC, it demonstrated significantly improved long-term stability. After two years, the efficiency drop in the NSF-rGO encapsulated DSSC was notably less than in the conventional design, indicating effective electrolyte retention and resistance to degradation. These results suggest that NSF-rGO aerogel encapsulation is a promising strategy for extending the operational lifespan of DSSCs and contributing to more sustainable energy solutions. © 2025 Taiwan Institute of Chemical Engineers

关键词： Proton conductivity

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Characterization of a thermostable-organic solvent-tolerant lipase from thermotolerant Rhizopus sp. strain PKC12B2 isolated from palm kernel cake

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Case Studies in Chemical and Environmental engineering 2024年 9卷

作者： Riyadi, Fatimah Azizah Alam, Md Zahangir Salleh, Md Noor Salleh, Hamzah Mohd Hidayatullah, Ibnu Maulana Hara, Hirofumi Department of Chemical Engineering Faculty of Engineering Universitas Indonesia West Java Depok 16424 Indonesia Bioprocess Engineering Study Program Faculty of Engineering Universitas Indonesia West Java Depok 16424 Indonesia Research Center for Biomass Valorization Universitas Indonesia West Java Depok 16424 Indonesia Bioenvironmental Engineering Research Centre (BERC) Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia Kuala Lumpur 53100 Malaysia Department of Biotechnology Graduate School of Agricultural and Life Sciences The University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo 113-8657 Japan

In this work, a new thermostable and organic solvent-tolerant lipase produced from Rhizopus sp. strain PKC12B2 was characterized to evaluate its activity and stability toward pH, temperature, organic solvents, and surfactants. The catalytic efficiency of the produced enzyme was also analyzed through enzyme kinetics study. Produced lipase exhibits remarkable stability at pH 8.0 to pH 10.0 and shows optimum activity at pH 9.0, demonstrating alkali lipase properties. Lipase has an optimum temperature of 45 °C and possesses significant thermal stability in the temperature range between 45 and 55 °C. Exceptional enzyme stability was also demonstrated in the presence of both polar solvents, such as glycerol, isopropanol and acetone, as well as non-polar solvents, such as cyclohexane and heptane up to 30 % (v/v) solvent concentration, where the enzyme retained more than 80 % activity after 1-h pre-incubation. For methanol, ethanol, and n-octanol, the relative activity of lipase was highly stable in the presence of up to 20 % (v/v) solvent concentration. Na⁺, Zn²⁺, and Fe³⁺ ions significantly stimulate the lipase activity at a final concentration of 10 mM. Lipase also demonstrated stimulatory effects towards a broad concentration range (0.2–1 %) of surfactants Tween 80 and Triton X-100. The Linearized Michaelis-Menten model in the form of Lineweaver-Burk (R² = 0.995) and Hanes-Woolf (R² = 0.996) models was found to successfully display the enzyme kinetics, in which the former generated Km and V_max of 1.965 mM and 4.51 mM/min respectively, while the latter generated Km and V_max of 1.295 mM and 3.389 mM/min, respectively. These new enzyme attributes demonstrate its great potential in biotechnology applications, such as for detergent formulations, biodiesel production and organic synthesis industries. © 2024 The Authors

关键词： Characterization Lipase Rhizopus sp. strain PKC12B2 Thermostable-organic solvent-tolerant enzyme

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Tetrahedral meshing for a slanted semi-elliptical surface crack at a solid cylinder

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engineering Fracture Mechanics 2021年 241卷 107400-107400页

作者： Teh, S. Andriyana, A. Ramesh, S. Putra, I.S. Kadarno, P. Purbolaksono, J. Department of Mechanical Engineering Faculty of Engineering University of Malaya Kuala Lumpur50603 Malaysia Mechanical Engineering Program Area Faculty of Engineering Universiti Teknologi Brunei GadongBE1410 Brunei Department of Mechanical Engineering Faculty of Industrial Technology Universitas Pertamina Jakarta12220 Indonesia Lightweight Structures Research Group Faculty of Mechanical and Aeronautical Engineering Institut Teknologi Bandung Bandung40132 Indonesia

This technical note demonstrates the use of tetrahedral meshing for modelling a slanted semi-elliptical surface crack at a solid cylinder by finite element method (FEM). For a relatively small ratio of the crack depth over cylinder diameter, Modes I and II (in-plane) stress intensity factors (SIFs) at the corner points by FEM were observed to be in good agreements with those by the dual boundary element method (DBEM). Effect of the crack aspect ratio, crack size and loading mode on the corner point singularity was noted. The tearing loading mode was found to promote a greater corner point singularity. © 2020 Elsevier Ltd

关键词： Finite element method

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Implementation of Malaria Detection Using MobileNetV2 Pretrained Model for Improved Deep Learning Based Diagnostics 10

Implementation of Malaria Detection Using MobileNetV2 Pretra...

引用

10th International Conference on Computing, engineering and Design, ICCED 2024

作者： Hidayat, Rahmat Solichin, Achmad Erfina, Adhitia Saepudin, Sudin Muslih, Muhamad Saringat, Mohd Zainuri Budi Luhur University Master of Computer Science Jakarta Indonesia Nusa Putra University Information Systems Study Program Sukabumi Indonesia Tun Hussein Onn Malaysia University Faculty of Computer Science and Information Technology Department of Software Engineering Malaysia

ISBN: (纸本)9798331529376

The Plasmodium parasite, which causes malaria, is an acute fever illness that infects people when a female Anopheles mosquito bites them. It is predicted that malaria would claim 619,000 lives in 2021, with 96% of those deaths occurring in the African continent. We can achieve this by using a microscope to examine thick and thin blood smears. The proficiency of a microscope examiner is crucial for doing microscopic examinations. Consider how time-consuming, ineffective, and costly it would be to examine thousands of malaria cases. Consequently, Creating an automated method for detecting malaria parasites is the aim of this study. We employ a MobileNetV2 pretrained model with CNN technology. Because it has been trained on dozens or even millions of data points, this pretrained model is incredibly light but dependable. There are two main benefits of automatic malaria parasite detection: firstly, it can offer a more accurate diagnosis, particularly in locations with limited resources;secondly, it lowers diagnostic expenses. The optimizer utilizes Adam Weight, the criteria uses NLLLoss, and the model is trained using 32 for batch_size. In the fourteenth epoch, we obtained the maximum accuracy score of 96.26% based on the training data. The outcomes of the predictions demonstrate how excellent this score is. EfficienceNet, DenseNet, AlexNet, and other pretrained models are among the alternatives that scientists are advised to try training with. © 2024 IEEE.

关键词： Convolutional neural networks

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The comparison of road network performance before and after the implementation of one-way system using prediction model

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AIP Conference Proceedings 2024年第1期2838卷

作者： Alfia Magfirona Nurul Hidayati Ari Wibowo Sri Sunarjono Budi Yulianto Civil Engineering Study Program Engineering Faculty Universitas Muhammadiyah Surakarta Indonesia Civil Engineering Master Study Program Engineering Faculty Universitas Muhammadiyah Surakarta Indonesia Transportation Agency of Surakarta Indonesia Dinas Perhubungan Surakarta Indonesia

One-way traffic networks maybe force drivers to bypass blockages to reach their destinations, potentially increasing trip distances. However, it is beneficial for anticipating some traffic problems in most urban traffic conditions—only a few studies concerned the regression approach for predicting road network performance models. As a result, this research aims to use the regression method to forecast the performance model of the road network before and after one-way traffic system implementation. The derived model equations are compared to see which ones substantially impact the road network’s performance. This study relies on secondary data from performance assessments of 26 roads before and after the system during morning peak hours of 06:30–07:30 AM. The independent variables (X) are data from segment analysis used, i.e., Volume (X1), Speed (X2), and Volume (X4), whereas the dependent variable (Y) is Level of Service. By attempting the model prediction multivariate linear regression modeling before the system, Y = 5.647 – 4.376X1+0.009X2+0.0003X4 tend better than others. It provided a more significant impact on LOS than other models provided by R-value 0.951 is higher than the other models. The R-square value is 0.904, which means that 90.4% of LOS is influenced by DS, V, and Q factors. Further research is needed to conduct in the form of additional other factors that can affect LOS.

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The profile of pempek as a determining factor of quality, originality and ethnicity

The profile of pempek as a determining factor of quality, or...

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International Conference on Science and Technology Applications 2019, ICoSTA 2019

作者： Supriadi, A. Saputra, D. Priyanto, G. Baehaki, A. Pambayun, R. Doctoral Stud. at the Faculty of Agriculture Universitas Sriwijaya Indonesia Agricultural Engineering Study Program Faculty of Agriculture Agricultural Product Technology Study Program Faculty of Agriculture Fishery Product Technology Study Program Faculty of Agriculture Universitas Sriwijaya Palembang30139 Indonesia

Pempek is a traditional ethnic food originated from Palembang, South Sumatra, Indonesia. Currently, there is not exist any profiles which could be used as a determining factor for quality, originality, and ethnicity of pempek. The objective of this research was to obtain the chemical profile of pempek as a determining factor of quality, originality and ethnicity. The samples were collected from the ten famous branded vendors in Palembang. The fish used in making pempek of the samples are snake head fish, Spanish mackerel, and the mix of snake head and Spanish mackerel. The type of pempek used in this experiment was steamed cook pempek lenjer (cylindrical) type. The analysis was performed at a KAN accredited laboratory. It was found that the energy content of pempek used in this experiment was in the range of 125 to 160 kkal/100 g sample and all the pempek used had a 0% of fat. All pempek used had 17 types of amino acid, and all of them had an essential amino acid. The significant finding was that the concentration of glutamic acid was 200% of the concentration of common concentration which indicated that all the vendors used artificial mono-sodium glutamate to improve the taste of pempek. It was concluded that the chemical profile found on this research could be used as database for creating a standard of identity of pempek. © Published under licence by IOP Publishing Ltd.

关键词： Fish

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Laboratory test on pullout capacity of winged box anchor for expansive soil

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AIP Conference Proceedings 2024年第1期3145卷

作者： Tiorivaldi Tiorivaldi Yusep Muslih Purwana Bambang Setiawan Civil Engineering Department Faculty of Engineering Universitas Sebelas Maret Surakarta Indonesia Civil Engineering Postgraduate Study Program Faculty of Engineering Surakarta Indonesia

Expansive soil is one type of problematic soil, overly sensitive to changes in moisture content. This soil has the characteristics of large shrinkage expansion due to changes in pore volume which can cause lifting forces on existing construction can cause damage to the construction. This research aims to analyze the tensile capacity by using a winged box anchor against expansive soil expected to overcome the problem of swelling in expansive soil. The research was conducted experimentally at the Soil Mechanics Laboratory of Sebelas Maret University Surakarta. The materials used in this test were sand and expansive soil taken from Sambungmacan, Sragen, Central Java. The main test equipment used in this test is a steel cylindrical tube. A winged box anchor with a size of 7x7x30 cm is embedded in a steel cylindrical tube containing 75 cm of sand in the bottom layer and 25 cm of expansive soil in the top layer. Then the expansive soil is gradually moistened with water until it reaches a moisture content of 50% to determine its effect on the swelling value. The results of this modeling show that the winged box anchors are promising to reduce the swelling behavior of expansive soil.

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Project-based learning model with real object in vocational school learning 3

Project-based learning model with real object in vocational ...

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3rd International Conference on Vocational Education of mechanical and Automotive Technology, ICoVEMAT 2020

作者： Handoyono, Nurcholish Arifin Suparmin Samidjo Johan, Arif Bintoro Suyitno Mechanical Engineering Education Vocational Study Program Faculty of Teacher Training and Education Universitas Sarjanawiyata Tamansiswa Yogyakarta Indonesia Department of Automotive Engineering Education Faculty of Teacher Training and Education Universitas Muhammadiyah Purworejo Indonesia

Learning in vocational schools is not enough just teacher-centered because the material presented does not only cover cognitive aspects, but also the affective and psychomotor aspects. In fact, there are still many teachers who use conventional modes, including learning technical drawings, so that student learning outcomes are low. The purpose of this research was to determine the learning outcomes of the PjBL model using real object media better than conventional methods in technical drawing subjects. A quasi-experiment was used in research with a nonequivalent control group design. The study population was 42 students of class X TP. The sampling technique uses cluster sampling. Class X TP1 as a control class with 23 students and Class X TP2 as an experimental class with 19 students. Data collection techniques using test techniques. The research instrument was a test sheet. The data analysis used t-test analysis with prerequisite tests, namely the normality test and homogeneity test. Based on testing the hypothesis test, it was concluded that the PjBL model with real objects gives better learning outcomes compared to conventional methods of learning outcomes of technical drawings. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Students

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