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Circular Economy for Sustainable Disposal and Reuse of Pruning Waste for Generating New Selective Materials
Gal Shwartz,
Gideon Oron
Posted: 17 February 2025
Dimensional and Surface Roughness Analysis of 3D Printed Impeller Pattern for Investment Casting
Margi Shah,
Dhiren Patel,
Sarang Pande,
Mustafa Haider Abidi,
Fahad Alasim,
Kuldeep A Mahajan
Posted: 17 February 2025
Detailed Characterization of Isolated Single and Half-Bridge Gate Drivers from Room Temperature to Cryogenic Temperatures
Stefanie Büttner,
Inka Freundorfer,
Martin März
Posted: 17 February 2025
Performance of Concrete Containing Water-Hyacinth Ash (Wha) as a Cement Replacement: Fresh and Mechanical Properties
Ahmed Omran,
Nancy Soliman
Considerable efforts are exerted worldwide to use local and waste materials to avoid stockpiling and conserving the environment. The current research investigates the possibility of using the ash produced from the water-hyacinth plant, which causes enormous environmental problems, as a partial cement replacement. The study revealed that under certain burning and grinding conditions, the water-hyacinth ash (WHA) has amorphous and pozzolanic characteristics. The research presents the fresh and mechanical performances of the WHA in paste, mortar, and concrete mixtures. The experimental evaluation included two WHA burning conditions (in the open air for 60 min and closed oven at 600oC for 30 min), different cement replacement ratios (5%, 10%, 15%) by WHA, and the use of three coarse aggregate types. The results illustrate that the WHA is a pozzolanic material that contributes to strength gain over time. The concrete containing WHA showed better performance than the control made with only Portland cement and comparable behavior to mixtures containing 10% silica fume. Based on the current study, the 10% WHA replacement ratio to cement can be considered optimum. The two WHA types obtained from the two different burning methods yielded a slight difference in performance, and the choice should be optimized based on environmental conservation.
Considerable efforts are exerted worldwide to use local and waste materials to avoid stockpiling and conserving the environment. The current research investigates the possibility of using the ash produced from the water-hyacinth plant, which causes enormous environmental problems, as a partial cement replacement. The study revealed that under certain burning and grinding conditions, the water-hyacinth ash (WHA) has amorphous and pozzolanic characteristics. The research presents the fresh and mechanical performances of the WHA in paste, mortar, and concrete mixtures. The experimental evaluation included two WHA burning conditions (in the open air for 60 min and closed oven at 600oC for 30 min), different cement replacement ratios (5%, 10%, 15%) by WHA, and the use of three coarse aggregate types. The results illustrate that the WHA is a pozzolanic material that contributes to strength gain over time. The concrete containing WHA showed better performance than the control made with only Portland cement and comparable behavior to mixtures containing 10% silica fume. Based on the current study, the 10% WHA replacement ratio to cement can be considered optimum. The two WHA types obtained from the two different burning methods yielded a slight difference in performance, and the choice should be optimized based on environmental conservation.
Posted: 17 February 2025
Evaluation of Perfusion Cell Culture Conditions in a Double-Layered Microphysiological System Using AI-Based Morphological Analysis
Naokata Kutsuzawa,
Tomomi Goto,
Hiroko Nakamura,
Miwa Maeda,
Masaki Kinehara,
Junko Sakagami,
Hiroshi Kimura
Posted: 17 February 2025
Effects of ECAP and Recovery Treatment on Microstructure, Mechanical, Tribological and Corrosion Properties of 316L Steel
Ata Radnia,
Mostafa Ketabchi,
Anqiang He,
Guijiang Diao,
Dongyang Li
Posted: 17 February 2025
An End-to-End Relearning Framework for Building Energy Optimization
Avisek Naug,
Marcos Quinones-Grueiro,
Gautam Biswas
Posted: 17 February 2025
Statistically-Informed Multimodal (Domain Adaptation by Transfer) Learning Framework: A Domain Adaptation Use-Case for Industrial Human-Robot Communication
Debasmita Mukherjee,
Homayoun Najjaran
Posted: 17 February 2025
A Sustainability-Driven Approach to Early-Stage Offshore Vessel Design: A Case Study on Wind Farm Installation Vessels
Dorota Nykiel,
Arkadiusz Zmuda,
Tomasz Abramowski
Posted: 17 February 2025
Uav Audio Signal Detection Method Based on Gru and Attention Mechanism
Lan Xu,
Zhongqiang Luo
Posted: 17 February 2025
Proactive Maintenance of Pump Systems Operating In the Mining Industry – a Systematic Review
Sylwia Werbinska-Wojciechowska,
Rafal Rogowski
Posted: 17 February 2025
Portugal’s Wattle and Daub Constructive Legacy
Kátia Soares,
Isabel Torres,
Ana Luísa Velosa
Posted: 17 February 2025
Evaluation of the Energy Quality of a 2 MWp Photovoltaic Power Plant Integrated into the Distribution Network: Revision of the EN50160 Standard on Total Harmonic Distortion and Voltage Variations
Azeddine BOUZBIBA,
YASSINE TALEB,
AHMED ABBOU
Posted: 17 February 2025
The Effect of Dental Implant Restoration on the Biomechanics of the Temporomandibular Joint in Patients with Posterior Tooth Loss
Yuanli Zhang,
Chongzhi Yin,
Fei Chen,
Guizhi Zhang,
Po Hao,
Yongli Pu,
Haidong Teng,
Hong Huang,
Zhan Liu
Posted: 14 February 2025
Fatigue Reliability Analysis of Offshore Wind Turbines Under Combined Wind-Wave Excitation via DPIM
Jingyi Ding,
Hanshu Chen,
Xiaoting Liu,
Youssef F. Rashed,
Zhuojia Fu
Posted: 14 February 2025
Ultrasonic TOFD Imaging Enhancement Technology for Pipeline Girth Welds Testing via Time Domain Sparse Deconvolution and Frequency Domain Synthetic Aperture Focusing
Eryong Wu,
Ye Han,
Bei Yu,
Wei Zhou
Posted: 14 February 2025
Synthesis of Four-Link Initial Kinematic Chains with Spherical Pairs for Spatial Mechanisms
Algazy Zhauyt,
Kuanysh Alipbayev,
Serikbay Kosbolov,
Alisher Aden,
Aray Orazaliyeva,
Samal Abdreshova
This research addresses the problem of initial synthesis of kinematic chains with spherical kinematic pairs, which are essential in the design of spatial mechanisms used in robotics, aerospace, and mechanical systems. The goal is to establish the existence of solutions for defining the geometric and motion constraints of these kinematic chains, ensuring that the synthesized mechanism achieves the desired motion with precision. By formulating the synthesis problem in terms of nonlinear algebraic equations derived from the spatial positions and orientations of the links, we analyze the conditions under which a valid solution exists. We explore both analytical and numerical methods to solve these equations, highlighting the significance of parameter selection in determining feasible solutions. The study further investigates the impact of initial conditions and design parameters on the stability and flexibility of the synthesized kinematic chain. The findings provide a theoretical foundation for guiding the practical design of spatial mechanisms with spherical joints, ensuring accuracy and reliability in complex motion tasks. This work presents a comprehensive framework for the 3D visualization of geometric transformations and coordinate relationships using Python 3.13.0. Leveraging the capabilities of libraries such as NumPy and Matplotlib, we develop a series of modular code examples that illustrate how to plot and analyze multidimensional data pertinent to kinematic chain synthesis and robotic mechanisms. Specifically, our approach demonstrates the visualization of fixed points, such as XA, YA, ZA, xB, yB, zB, and xC, yC, zC, alongside their spatial differences with respect to reference points and transformation matrices. We detail methods for plotting transformation components, including rotation matrix elements (e, m, n) and derived products from these matrices, as well as the representation of angular parameters (θi, ψi, i) in a three-dimensional context. The proposed techniques not only facilitate the debugging and analysis of complex kinematic behaviors but also provide a flexible tool for researchers in robotics, computer graphics, and mechanical design. By offering a clear and interactive visualization strategy, this framework enhances the understanding of spatial relationships and transformation dynamics inherent in multi-body systems.
This research addresses the problem of initial synthesis of kinematic chains with spherical kinematic pairs, which are essential in the design of spatial mechanisms used in robotics, aerospace, and mechanical systems. The goal is to establish the existence of solutions for defining the geometric and motion constraints of these kinematic chains, ensuring that the synthesized mechanism achieves the desired motion with precision. By formulating the synthesis problem in terms of nonlinear algebraic equations derived from the spatial positions and orientations of the links, we analyze the conditions under which a valid solution exists. We explore both analytical and numerical methods to solve these equations, highlighting the significance of parameter selection in determining feasible solutions. The study further investigates the impact of initial conditions and design parameters on the stability and flexibility of the synthesized kinematic chain. The findings provide a theoretical foundation for guiding the practical design of spatial mechanisms with spherical joints, ensuring accuracy and reliability in complex motion tasks. This work presents a comprehensive framework for the 3D visualization of geometric transformations and coordinate relationships using Python 3.13.0. Leveraging the capabilities of libraries such as NumPy and Matplotlib, we develop a series of modular code examples that illustrate how to plot and analyze multidimensional data pertinent to kinematic chain synthesis and robotic mechanisms. Specifically, our approach demonstrates the visualization of fixed points, such as XA, YA, ZA, xB, yB, zB, and xC, yC, zC, alongside their spatial differences with respect to reference points and transformation matrices. We detail methods for plotting transformation components, including rotation matrix elements (e, m, n) and derived products from these matrices, as well as the representation of angular parameters (θi, ψi, i) in a three-dimensional context. The proposed techniques not only facilitate the debugging and analysis of complex kinematic behaviors but also provide a flexible tool for researchers in robotics, computer graphics, and mechanical design. By offering a clear and interactive visualization strategy, this framework enhances the understanding of spatial relationships and transformation dynamics inherent in multi-body systems.
Posted: 14 February 2025
Intensity Correlation Imaging and Nonnegative Dynamic Systems
David Hyland
This work is a supplement to the the author’s “The Rise of the Brown-Twiss Effect” featured in the Photonics special issue: “Optical Imaging and Measurements: 2nd Edition". The main contribution for the author’s algorithm was the survey of the stochastic search algorithm required to determine the true noise free-image via the Brown-Twiss effect with enormously small integration times. A key element in the algorithm was the introduction of initial conditions where the values of the intensity pixels are assumed to be mutually statistically independent and uniformly distributed over the range where is a (very small) positive constant. This algorithm performed quite well, but the small initial conditions are unnecessary, as well as other complications that should be simplified. Here we streamline the algorithm in the form of a discrete-time dynamic system and explore the alternate features and benefites of compartmental nonnegative dynamic systems.
This work is a supplement to the the author’s “The Rise of the Brown-Twiss Effect” featured in the Photonics special issue: “Optical Imaging and Measurements: 2nd Edition". The main contribution for the author’s algorithm was the survey of the stochastic search algorithm required to determine the true noise free-image via the Brown-Twiss effect with enormously small integration times. A key element in the algorithm was the introduction of initial conditions where the values of the intensity pixels are assumed to be mutually statistically independent and uniformly distributed over the range where is a (very small) positive constant. This algorithm performed quite well, but the small initial conditions are unnecessary, as well as other complications that should be simplified. Here we streamline the algorithm in the form of a discrete-time dynamic system and explore the alternate features and benefites of compartmental nonnegative dynamic systems.
Posted: 14 February 2025
Rehabilitation System for Muscle Atrophy of the Hand Due to Rheumatoid Arthritis. Evaluation of Patients and Therapists
Roberto Moya-Jiménez,
Andrea Goyes-Balladares,
Mario Rivera-Valenzuela,
Teresa Magal-Royo
Posted: 14 February 2025
Sustainable Activated Carbon Production from Sunflower Seeds via Chemical Activation
Selma Kuloglija,
Amal El Gohary Ahmed,
Christian Jordan,
Matthias Golda,
Wolfgang Impsmiller,
Noah Steinacher,
Franz Winter,
Daniela Meitner,
Angelika Luckeneder,
Michael Harasek
Posted: 14 February 2025
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