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Improvement of Joint Strength Model in Discontinuous Deformation analysis 8th

Improvement of Joint Strength Model in Discontinuous Deforma...

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8th International conference on Mineral Resources, Geotechnology and Geological Exploration

作者： Chen, Minjie Xu, Ming Cai, Yu Liu, Xianshan Gan, Fengfan Chongqing Univ Sch Civil Engn Chongqing 400045 Peoples R China Natl Joint Engn Res Ctr Geohazards Prevent Reserv Chongqing 400045 Peoples R China Chongqing Design Grp Co Ltd Chongqing 401120 Peoples R China China Railway Eryuan Engn Grp Co Ltd Chengdu 610031 Peoples R China

ISBN: (纸本)9783031786921;9783031786907;9783031786891

the accurate computation of rock joint strength is important in practical engineering. To improve the accuracy of determining joint strength in Discontinuous deformation analysis (DDA), an improved joint strength model is proposed. the limitation of Mohr-Coulomb criterion with constant friction coefficient and the inconsistency of the definition of contact joint parameters in DDA are analyzed. In view of the existing problems, the improved joint strength model considers the different characteristics of two structure planes of a joint and friction angle degradation with the relative displacement between contact interface. And the specific implementation flowchart in DDA program is provided. the proposed model is examined by a case of block sliding under dynamic load. the results show that the improved model has the ability to determine joint strength consisting of two different structure planes and reproduce joint strength degradation.

关键词： Discontinuous deformation analysis rock mass joint contact joint parameter strength degradation

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SIR Meta Distribution analysis for Multi-antenna Multi-user Networks with Interference Nulling 14th

SIR Meta Distribution Analysis for Multi-antenna Multi-user...

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14th EAI International conference on Wireless and Satellite systems, WiSATS 2024

作者： Feng, Tianming Shu, Yuquan Yao, Zhihui The 54th Research Institute of China Electronics Technology Group Cooperation Shijiazhuang050081 China

ISBN: (纸本)9783031862021

this paper studies the signal-to-interference ratio (SIR) meta distribution (MD) for multi-antenna multi-user networks with interference nulling (IN) considered. Since it is difficult to calculate the expression for the SIR MD, we resort to a tight upper bound on the conditional success probability (CSP) and obtain its first moment and second moment;with further utilizing the beta distribution, we obtain an approximation on the SIR MD. With numerical simulations, the tightness of this expression is verified and the effects of system design parameters on the network performance from the perspectives of the distribution of individual link reliability are revealed. © ICST Institute for Computer Sciences, Social Informatics and Telecommunications engineering 2025.

关键词： Metamaterial antennas

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Comparative Life-Cycle Assessment of Novel Steel Section design with Wire Arc Additive Manufacturing 8th

Comparative Life-Cycle Assessment of Novel Steel Section Des...

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8th installment of the REWAS conference series held at the TMS Annual Meeting and Exhibition focuses on circular economy for the energy transition, 2025

作者： Arrè, Lidiana Pagone, Emanuele Laghi, Vittoria Martina, Filomeno Palermo, Michele University of Bologna Viale del Risorgimento 2 Bologna40136 Italy Faculty of Engineering and Applied Sciences Sustainable Manufacturing Systems Centre Cranfield University CranfieldMK43 0AL United Kingdom WAAM3D Ltd 5 Thornton Chase Milton KeynesMK14 6FD United Kingdom

ISBN: (纸本)9783031808913

Additive manufacturingAdditive manufacturing, particularly Wire Arc Additive ManufacturingAdditive manufacturing (WAAM), is emerging as a promising technology in the construction sector due to its potential to reduce environmental impactsEnvironmental impact. Life-Cycle Assessment (LCALife-Cycle Assessment (LCA)) is a crucial methodology for evaluating the environmental footprint of products and processes that can be carried out from raw materialRaw materials extraction to the end of production, commonly referred to as "cradle-to-gate" analysis. this study focuses on the environmental impactEnvironmental impact of 3D-printed steel elements using WAAM technology for construction applications. Specifically, the conventional production of Circular Hollow Section (CHS) steel components was compared with the innovative production of Tubular Sandwich Section (TSS) steel components using WAAM. the analysis provides a comparison of the carbon footprint associated to both production methods, highlighting in detail the emission factors associated with each step of the WAAM production. the results highlighted that WAAM not only offers design and structural benefits to build complex-shaped geometries but also contributes to more sustainable construction practices with a lower "cradle-to-gate" carbon footprint due to the reduced material consumption associated with material efficiency. © the Minerals, Metals & Materials Society 2025.

关键词： Carbon footprint

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design and analysis of Gudgeon Pin to Minimize Stress Concentration by Selecting Different Material through FEA 5th

Design and Analysis of Gudgeon Pin to Minimize Stress Concen...

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5th International conference on Innovative Product design and Intelligent Manufacturing systems, ICIPDIMS 2023

作者： Kumaraswamy, J. Siva Ramakrishna, Ch. Ramasubramanian, S. Mishra, Rahul Sakhare, D.T. Karthik, K. Baskar, S. Pandey, Krishna Kant Department of Mechanical Engineering R. L. Jalappa Institute of Technology Karnataka Doddaballapur561203 India Department of Mechanical Engineering Vignan’s Institute of Information Technology Andhra Pradesh Visakhapatnam530049 India Department of Automobile Engineering Vels Institute of Science Technology and Advanced Studies Tamil Nadu Chennai600117 India Department of Mechanical Engineering IES Institute of Technology & Management IES University Madhya Pradesh Bhopal462044 India Department of Chemistry Shivaji Art’s Commerce & Science College Kannad Maharashtra Aurangabad431103 India Department of Mechanical Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Tamil Nadu Chennai600062 India Department of Mechatronics Engineering Manipal University Jaipur Rajasthan Jaipur303007 India

ISBN: (纸本)9789819767311

the gudgeon pin is one of the engine's most stressed components. Gudgeon pins are used in automotive engines to link the piston and connecting rod. Stress concentration is a critical concern in the design of mechanical components, as it can lead to premature fatigue failure and, consequently, catastrophic consequences. To mitigate this risk, engineers continually seek ways to optimize the design of components like the gudgeon pin, and one avenue of exploration is the judicious choice of materials. this study looks at the detailed design and analysis of existing gudgeon pins in order to detect the pin's stress concentration and then minimize it by making necessary changes to the pin's design and mounting. the current work involved constructing a gudgeon pin and then using finite element analysis (FEA) software to examine and minimize stresses on the pin. this comprehensive study delves into the intricate world of gudgeon pin design and analysis, with a specific emphasis on minimizing stress concentration by selecting different materials through FEA. © the Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Stress concentration

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Multi-model-driven analysis of temporal and spatial variation of water quality in Xiangjiang River 8

Multi-model-driven analysis of temporal and spatial variatio...

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8th International conference on Energy engineering and Environmental Protection, EEEP 2024

作者： Zhou, Enling Xue, Chen Zhang, Jianjun Song, Lingyu Xiao, Ke Cai, Zhi College of Engineering and Design Hunan Normal University Changsha China Hunan Institute of Metrology and Test Changsha China Co. Ltd Changsha China

Water environment is the basis for human survival. Accurate assessment of water environment quality is of great significance for sustainable development. Based on the water quality monitoring data of 34 monitoring points in the Xiangjiang River Basin in the past 10 years, the water quality index data set was constructed. After data cleaning, the comprehensive water quality index identification method, clustering, M-K trend analysis and other technical methods were used to analyse the water quality changes of Xiangjiang River from 2013 to 2023. the experimental results show that in recent years, the concentration of ammonia nitrogen index has a significant downward trend;from the analysis based on time hierarchical clustering, it can be seen that the water quality change in Xiangjiang River Basin has obvious seasonal characteristics. © 2025 Published under licence by IOP Publishing Ltd.

关键词： Rivers

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Shear Strength of Red Meranti (Shorea Spp.) Timber at an Angle to the Grain 8th

Shear Strength of Red Meranti (Shorea Spp.) Timber at an Ang...

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8th International conference on Civil engineering, ICOCE 2024

作者： Pranata, Yosafat Aji Novi Setiawan, Deni Arisandhy, Vivi Wong, Hendry Hagiyanto, Sofhie Angela Faculty of Engineering Universitas Kristen Maranatha West Java Bandung40164 Indonesia

ISBN: (纸本)9789819759095

the shear strength is one of the parameters that is used for the design of beam members in wood buildings. Shear strength is also used as a parameter for bridge girder design. Red meranti (Shorea spp.) is a species that is easily found in Indonesia and is commonly used as a construction material for buildings, docks, or bridges. the objective of this study is to obtain an empirical equation for the shear strength with different grain angles from 0° to 10°. the research of the influence of the grain angle must be carried out under real conditions, since the direction of the wood grain is not perfectly 0° and the inclination of the grain can influence the shear strength of the wood. the method of making the specimens and the experimental methods refer to ASTM D143-22, and the total number of test specimens was 33 specimens. the tests were performed using a universal testing machine, with the test speed (crosshead) 0.6 mm/minute. the test results show that the shear strength of wood with a directional fiber angle ranging from 0° to 10° in a range from 2.77 MPa (10° grain angle) to 7.57 MPa (0° grain angle). the results of the analysis by the polynomial regression method give an empirical equation, namely Fv = 7.03 − 0.97θ + 0.066θ2 with R-Sq = 74.7%. Fiber angle has an effect on shear strength. Empirical equations offer advantages to building designers in calculating the design capacity of wood beams, especially due to shear forces. © the Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Timber

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Selection of the Climatic Information Processing Period for Calculating design Climate Data 8th

Selection of the Climatic Information Processing Period for ...

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8th International conference on Construction, Architecture and Technosphere Safety, ICCATS 2024

作者： Umnyakova, N.P. Research Institute of Building Physics of the Russian Academy of Architecture and Building Sciences 21 Lokomotivniy pr. Moscow127238 Russia 26 Yaroslavskoye Shosse Moscow129337 Russia

ISBN: (纸本)9783031804816

the climate changes occurring on Earth towards warming have affected the territory of Russia, where a greater increase in the temperature of the surface layer of air is observed. For the design, construction and operation of buildings it is necessary to have reliable values of climatic parameters. Traditionally, in Russia, the calculation of climatic parameters is based on the processing of data received from meteostations over a 50-year period. However, in connection with the ongoing warming, the question arose of reducing the period for processing initial data to 30 years. Studies have shown that in the Russian Federation annually various regions and territories are formed, where average monthly or average seasonal temperatures are 4–8 degrees below normal. In addition, trends in temperature changes in different regions are both positive and negative. the analysis of the differences in degree-days and average temperatures of the heating period showed that their difference for the two periods under consideration is insignificant and the decrease in degree-days amounts to an average of 100–15 °C-day across the territory of Russia and an increase in temperature 0.2–0. 4 ℃. Calculations of energy consumption by buildings based on calculated climatic parameters obtained over a period of 50 and 30 years showed that the difference is about 2–2.5%, which lies within the error of engineering calculations. In this regard, it is advisable to leave a 50-year period for processing climatic data from weather stations when calculating specialized climatic parameters for regulatory documents. © the Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Atmospheric temperature

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Flexural Behavior of Indonesian Berua Timber: Experimental Test and Numerical analysis 8th

Flexural Behavior of Indonesian Berua Timber: Experimental T...

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8th International conference on Civil engineering, ICOCE 2024

作者： Pranata, Yosafat Aji Kristianto, Anang Novi Faculty of Engineering Universitas Kristen Maranatha West Java Kota Bandung40164 Indonesia

ISBN: (纸本)9789819759095

the bending behavior of timber beams in a frame systems of modular timber house or permanent timber house needs to be known, specifically for the mechanical properties of bending forces, modulus of rupture, and modulus of elasticity. these three parameters are important parameters for the purposes of timber beam design in timber buildings both for non-multistorey and multistorey. One of the experimental testing methods in the laboratory for flexural or bending tests is based on the ASTM D143-21 Standard. the purpose of this study is to do the nonlinear finite element modeling of timber beam and experimental testing in the laboratory that is a flexural test to determine the behavior of beams. the scopes of the research, namely the bending behaviors, reviewed are as follows: the parameters of bending strength, modulus of rupture, and modulus of elasticity, the timber studied is Indonesian Berua timber, and bending testing is based on the ASTM standard reference which is D143-21. the method that used in this study is based on experimental tests and numerical analyses to obtain the empirical parameter of the bending strength. the results showed that the average flexural strength of timber with experimental test results obtained by 31.52 MPa, modulus of rupture 46.68 MPa, and modulus of elasticity 4143.51 MPa, while the results of the nonlinear finite element modeling showed the bending strength of 29.33 MPa (% difference with experimental results is − 6.96%), modulus of rupture 49.63 MPa (% difference with experimental results is 6.34%), and modulus of elasticity 3477.19 MPa (% difference with experimental results is − 16.09%). these results show that in general the nonlinear finite element modeling produces values that are close to the results of experimental testing. One of the important benefits of numerical modeling is to study the behavior of buildings due to working loads so that predictions of strength, rigidity, and stability behavior can be known. this is impor

关键词： Wooden beams and girders

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Testability Research of Civil Aircraft Cockpit Lighting System

Testability Research of Civil Aircraft Cockpit Lighting Syst...

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IEEE Information Technology and Mechatronics engineering conference (ITOEC)

作者： Chen Shihui Shanghai Aircraft Design & Research Institute Shanghai China

ISBN: (数字)9798331529482

ISBN: (纸本)9798331529499

the cockpit lighting system is a critical human-machine interface that integrates controls, displays, and lighting for status control and indication across various aircraft systems. It enables flight crews to operate aircraft systems and provides illumination and status displays under all cockpit lighting conditions. Effective cockpit lighting design mitigates pilot visual fatigue, enhances operational accuracy, and reduces the risk of human error-induced flight accidents, thus fostering a more comfortable flight environment. Adhering to MIL-STD-2165, this study employs diverse testability design and analysis methods, including FMEA, testability analysis, and BIT design, to enhance the testability and safety of the cockpit lighting system. the research contributes novel perspectives and methodologies for the design and maintenance of future civil aircraft cockpit lighting systems, emphasizing fault detection and prediction to ensure system reliability throughout its lifecycle.

关键词： Military standards Visualization Mechatronics Human-machine systems design methodology Lighting Safety Maintenance Aircraft Usability

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An Experimental Educational Tool for Financial Literacy in Children of 3–10 Years 5th

An Experimental Educational Tool for Financial Literacy in C...

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5th International conference on Innovative Product design and Intelligent Manufacturing systems, ICIPDIMS 2023

作者： Majumder, Debashis Dasgupta, Ipsita Tambe, Mugdha Bidholi Via Premnagar Uttarakhand Dehradun248007 India Libra Design Pvt Ltd Dehradun India UID Gandhinagar India

ISBN: (纸本)9789819767311

this innovative study explores the significance of financial literacy for kids between the ages of three and ten, as well as the critical role that educational toys may play in supporting that development. the study emphasizes the value of early financial literacy, its possible long-term benefits, and the efficiency of educational toys in promoting financial knowledge and decision-making among young learners through a thorough literature review and market analysis of educational toys. the researchers hope to shed light on the crucial connection between financial literacy and educational toys through their research and study. Based on the research study, innovative exploration of designing suitable financial toy for young learners is done. their feasibility and suitability of development for financial awareness in young kids of 3–10 are discussed. the design idea is modeled, and design intricacies are explained. © the Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Decentralized finance

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