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Experimental and Numerical Study on the Trailing Edge Cutback Cooling Characteristics with POD Analysis

Journal of Thermal Science 2025年第3期34卷 834-849页

作者： LIU Jiajie WANG Pengfei WANG Pei LIU Jun DU Qiang WANG Haohan WANG Zhiguo SHEN Xin ZHU Junqiang Key Lab of Light-duty Gas-turbine Institute of Engineering TermophysicsChinese Academy of Sciences University of Chinese Academy of Sciences National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine Research Center of Fluid Machinery Engineering and Technology Jiangsu University

This paper investigates the film cooling characteristics and flow structure of trailing edge cutback in turbine vanes,and explains the unsteady flow mixing mechanism of this cooling structure using Proper Orthogonal Decomposition（POD） *** Delayed Detached Eddy Simulation（DDES） turbulence model was used to obtain detailed information about the velocity and temperature field for the POD *** verify the accuracy of the numerical results,fast-response Pressure Sensitive Paint（PSP） and high-frequency Particle Image Velocimetry（PIV） experiments were also conducted,and the results achieved good *** the blowing ratio increases,the effectiveness η of the cutback's film cooling exhibits a "increase-decrease-increase" trend,with η reaching its minimum point at around a blowing ratio(Mslot) of *** kinds of coherent vortex structures are observed in the flow field at different blowing *** to the analysis using the POD method,the first and second order modes of a Karman-like vortex street are observed in the vicinity of the wall at various blowing *** coherent flow structure is directly related to the mixing intensity between the mainstream gas and the *** Mslot=0.75,these modes had the highest energy ratio and formed a stable dominant coherent structure in the flow *** the blowing ratio increases,the main characteristic modes in the temperature field gradually change,and the mode appears crescent-shaped when the effectiveness of film cooling is at its *** paper combines the vortex structure of the flow field to explain the flow field feature distribution at the lowest effectiveness point η and analyzes its impact on the film cooling characteristics of the protected surface.

关键词： film cooling Proper Orthogonal Decomposition (POD) shedding vortices trailing edge cutback unsteady flow mixing

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The Behavior of Tapered and Step-Tapered Piles under Lateral Load

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engineering Letters 2025年第3期33卷 530-544页

作者： Raghavendra, H.N. Kappadi, Pramodkumar Likhitha, H. Yadav, Arunkumar Department of Civil Engineering Dayananda Sagar College of Engineering Bangalore560111 India Department of Civil Engineering Global Academy of Technology Bangalore560098 India Department of Civil Engineering Manipal Institute of Technology Bengaluru Manipal Academy of Higher Education Manipal India

The present study is an experimental investigation to determine the behavior of tapered and step-tapered piles in sand (cohesionless soil) under horizontal loads. A series of lateral loading tests were conducted on the modeled tapered and step-tapered piles with varying sections equal to taper angles of 0.5°, 1°, 1.5°, 2°, and segments of 2-segments, 3-segments, and 5-segments respectively. A large experimental facility was established to test the model piles. The testing facility consists of a model steel tank containing soil and a provision for applying an incremental lateral load. The pile was measured along its length to determine its behavior with depth. Tests were performed to failure to investigate the ultimate lateral load capacity and deflection. The results were compared with those of uniform-diameter piles to determine the performance of tapered and stepped piles. The results showed that the lateral capacity of both piles was significantly improved compared with that of the uniform-diameter pile. In addition, it was found that there exists an optimum taper angle and segments for tapered and step-tapered piles, which are in the range of 1° – 1.5° for tapered piles and 3 – 5 segments for step-tapered piles. It was concluded from the study that tapered and step-tapered piles have an increased lateral load-carrying capacity with a better distribution of materials, leading to economic benefits. © 2025, International Association of Engineers. All rights reserved.

关键词： Steel tanks

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Overview of in-situ oxygen production technologies for lunar resources

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 233-255页

作者： Youpeng Xu Sheng Pang Liangwei Cong Guoyu Qian Dong Wang Laishi Li Yusheng Wu Zhi Wang College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial ***,crucial for supporting human life on the Moon,can be extracted from lunar regolith,which is highly rich in oxygen and contains polymetallic *** oxygen and metal extraction can be achieved using existing metallurgical ***,the ample reserves of water ice on the Moon offer another means for oxygen *** paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon,drawing from an analysis of lunar resources and environmental *** delves into the principles,processes,advantages,and drawbacks of water-ice electrolysis,two-step oxygen production from lunar regolith,and one-step oxygen production from lunar *** two-step methods involve hydrogen reduction,carbothermal reduction,and hydrometallurgy,while the one-step methods encompass fluorination/chlorination,high-temperature decomposition,molten salt electrolysis,and molten regolith electrolysis(MOE).Following a thorough comparison of raw materials,equipment,technology,and economic viability,MOE is identified as the most promising approach for future in-situ oxygen production on the *** the corrosion characteristics of molten lunar regolith at high temperatures,along with the Moon's low-gravity environment,the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the *** review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

关键词： lunar resources in-situ oxygen production space metallurgy molten lunar regolith electrolysis

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Emerging role of graphitic carbon nitride in advanced supercapacitors:A comprehensive review

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Journal of Energy Chemistry 2025年第4期103卷 498-524页

作者： Priyanka Chaluvachar Y.N.Sudhakar G.T.Mahesha Vishnu G.Nair Nakul Desai Dayananda K.Pai Department of Aeronautical and Automobile Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104KarnatakaIndia Department of Chemistry Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104KarnatakaIndia

Graphitic carbon nitride(g-C_(3)N_(4)),known for its green and abundant nature and composed of carbon and nitrogen in a two-dimensional structure,has emerged as a significant area of interest across various disciplines,particularly in energy conversion and *** recent demonstrations of high potential in supercapacitor applications mark it as a promising alternative to graphene within the realm of materials *** favorable features,such as chemical and thermal stability,abundant nitrogen content,eco-friendly attributes,and gentle conditions for synthesis,are *** review summarizes recent advancements in the use of g-C_(3)N_(4)and its composites as electrodes for supercapacitors,highlighting the advantages and issues associated with g-C_(3)N_(4)in these *** emphasizes situations where the composition of g-C_(3)N_(4)with other materials,such as metal oxides,metal chalcogenides,carbon materials,and conducting polymers,overcomes its limitations,leading to composite materials with improved *** review discusses the challenges that still need to be addressed and the possible future roles of g-C_(3)N_(4)in the research of advanced supercapacitor technology,such as battery-hybrid supercapacitors,flexible supercapacitors,and photo-supercapacitors.

关键词： Graphitic carbon nitride Metal oxides Graphene Conducting polymers Battery-type hybrid supercapacitors Flexible supercapacitors Photo-supercapacitors

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DESIGN AND ANALYSIS OF FLEXIBLE MICROSTRIP PATCH ANTENNA ON rGO MATERIAL DEPOSITION FOR WIRELESS APPLICATIONS

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Telecommunications and Radio engineering (English translation of Elektrosvyaz and Radiotekhnika) 2025年第3期84卷 1-17页

作者： Madabhushi, Havishma Venkata De, Shounak Kumar, Pramod Ali, Tanweer Kumar, Praveen Kumar, Om Prakash Junjunwala, Vikas Kumar Vincent, Shweta Pathan, Sameena Department of Electronics & Communication Engineering Manipal Institute of Technology Manipal Academy of Higher Education Karnataka Manipal576104 India Department of Electrical & Electronics Engineering Manipal Institute of Technology Manipal Academy of Higher Education Karnataka Manipal576104 India Department of Mechatronics Manipal Institute of Technology Manipal Academy of Higher Education Karnataka Manipal576104 India Department of Information & Communication Technology Engineering Manipal Institute of Technology Manipal Academy of Higher Education Karnataka Manipal576104 India

This paper describes the design and analysis of a flexible microstrip patch antenna for wireless applications that uses reduced graphene oxide (rGO) material deposition on cotton substrates. Using a microstrip line-fed design, the proposed dual-band antenna resonates at 5.5 and 8 GHz. The study investigates the application of rGO as a conductive patch on cotton, emphasizing its durability, low energy gap, and strong conductivity. The design methodology uses a step-by-step optimization process to achieve an efficient performance. The antennas are simulated with the high-frequency structure simulator (HFSS), and prototype results are reported. © 2025 by Begell House, Inc.

关键词： Slot antennas

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A Comparative Study of Purge Flow Aero-Thermal Performance under Pre-Swirl and Rotational Conditions

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Journal of Thermal Science 2025年第2期34卷 626-638页

作者： GAO Hongyu WANG Yutian XU Renjie XU Qingzong School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100045China

Investigating the interaction between purge flow and main flow in gas turbines is crucial for optimizing thermal management,and enhancing aerodynamic *** the high-speed rotating rotor poses challenges;however,employing the pre-swirl method to model rotational effect can facilitate experimental *** study evaluates the validity of the pre-swirl method for modeling rotational *** simulations are conducted under both stationary conditions,with seven swirl ratios,and rotational *** investigation focuses on the underlying mechanisms of pre-swirl and ***-swirl and rotation impart circumferential velocity to the purge flow relative to the blade,resulting in a diminishing effect on endwall *** the other hand,pre-swirl reduces the adverse pressure gradient,and the rotation generates Coriolis forces acting on the passage vortex,both contribute to an increasing effect on endwall *** pre-swirl condition,the diminishing effect is dominant,while in rotational condition,neither the diminishing nor the increasing effect exhibits an overwhelmingly dominant trend.

关键词： gas turbine rotational effect pre-swirl purge flow endwall cooling effectiveness

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Gamification in architecture: is Egypt’s real estate ready for interactive design?

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HBRC Journal 2025年第1期21卷 1-16页

作者： Salama, Ahmed H. Department of Architectural Engineering & Environmental Design College of Engineering & Technology Arab Academy for Science Technology and Maritime Transport Smart Village Campus Giza Egypt

Seeking an Egyptian real estate industry receptive to real-time interactive design, this study departs from static 3D renders to enhance user engagement. Advanced interactive design walkthrough prototypes, integrated with Building Information Modeling (BIM), were presented to Cairo developers. A mixed methods approach of surveys and interviews analyzed their acceptance, uncovering the strengths and weaknesses of real-time interactive design implementation. Findings revealed the need for the industry to embrace virtual reality (VR) technologies for improved user participation. While concerns exist, developers recognize the potential of VR tools, particularly Unreal Engine, for engaging presentations. The increasing reliance on digital solutions in real estate highlights the importance of interactive and immersive technologies in enhancing user experiences. By bridging the gap between traditional architectural visualization techniques and emerging digital innovations, this study emphasizes the transformative potential of real-time interactive design. It also situates VR and BIM as pivotal tools in reshaping architectural communication, allowing stakeholders to explore and experience spaces before construction. The study offers a valuable foundation for exploring real-time interactive design’s potential in architectural gamification and project visualization. This original research introduces real-time interactive design through VR for the Egyptian real estate market, triggering the concept of architectural gamification. It promotes user engagement through interactive designs and bridges the gap between theoretical and practical aspects of interactive design. © 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

关键词： Gamification

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Giant low-field magnetocaloric effect in unstable antiferromagnetic Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds

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Journal of Rare Earths 2025年第2期43卷 312-318,I0003页

作者： Bo Xu Lu Tian Junfeng Wang Mei Wu Xinqiang Gao Zhenxing Li Jun Shen School of Rare Earths University of Science and Technology of ChinaHefei230026China Key Laboratory of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou341119China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China

Magnetic refrigeration(MR)technology is regarded as an ideal solution for cryogenic applications,relying on magnetocaloric materials which provide necessary chilling effect.A series of polycrystalline Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds was synthesized,and their magnetic properties,magnetic phase transition together with magnetocaloric effect(MCE)were *** Tm_(1-x)Er_(x)Ni_(2)Si_(2)(x=0.2,0.4)compounds display a field-induced metamagnetic transition from antiferromagnetic(AFM)to ferromagnetism(FM)in excess of 0.2 T,***,the AFM ground state is *** the field change of 0-2 T,the values of maximal magnetic entropy change(-ΔS_(M)^(max))and refrigerant capacity(RC)for Tm_(0.8)Er_(0.2)Ni_(2)Si_(2)compound are 17.9 J/(kg·K)and 83.5 J/kg,*** large reversible MCE under low magnetic fields(≤2 T)indicates that Tm_(0.8)Er_(0.2)Ni_(2)Si_(2)compound can serve as potential candidate materials for cryogenic magnetic refrigeration.

关键词： Magnetocaloric materials Magnetocaloric effects Cryogenic magnetic refrigeration TmNi_(2)Si_(2) Rare earths

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Magnetism and cryogenic magnetocaloric effect of triangular-lattice LnOF(Ln=Gd,Dy,Ho,and Er) compounds

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Journal of Rare Earths 2025年第1期43卷 98-104,I0004页

作者： Jianjian Gong Lu Tian Lei Zhang Zhaojun Mo Yuanpeng Wang Jun Shen School of Rare Earths University of Science and Technology of ChinaHefei230026China Key Laboratory of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou34119China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing00081China

Frustrated lanthanide oxides with dense magnetic lattice and suppressed ordering temperature have potential applications in cryogenic magnetic ***,the crystal structure,magnetic properties,magnetic phase transition(MPT)together with magnetocaloric effect(MCE)of LnOF(Ln=Gd,Dy,Ho,and Er)compounds were *** study shows that these compounds crystallize in the centrosymmetric space group R3m with an ideal triangular *** long-range magnetic ordering is observed above 2 K for LnOF(Ln=Gd,Ho,and Er).However,DyOF compound undergoes an MPT from paramagnetic(PM)to antiferromagnetic(AFM)at the Neel temperature(TN≈4 K).Considerable reversible MCE is observed in these triangular-lattice *** the magnetic field change(μ0ΔH)of 0-2 T,the maximum values of magnetic entropy change(-ΔSMmax)of them are 6.1,9.4,12.7,and 14.1 J/(kg·K),***,the value of ErOF with Ising-like spin is 2.3 times that of GdOF,which provides an approach for exploring magnetic refrigerants with excellent low-field cryogenic magnetocaloric effect.

关键词： Geometric magnetic frustration Magnetic phase transition Magnetocaloric effect Magnetic refrigeration Rare earths

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Automatic 3D inspection method for AR-assisted assembly based on virtual-to-real registration

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Journal of Manufacturing Systems 2025年 80卷 933-947页

作者： Yan, Zhang Hongyong, Fu Xinyuan, Jiang Xinlong, Qi Enze, Cui Lu, Zhang University of the Chinese Academy of Sciences Technology and Engineering Center for Space Utilization Beijing100094 China Key Laboratory of Space Utilization Chinese Academy of Sciences Technology and Engineering Center for Space Utilization Beijing100094 China

Augmented reality (AR) has been widely employed in intelligent assembly tasks to improve assembly efficiency by layering virtual instructions onto real assemblies, providing operators with step-by-step guidance. However, current AR-assisted assembly systems are limited to being visualization tools, requiring manual control of the guide program by operators and potentially causing distractions and increased operational load. Furthermore, these systems lack the ability to detect incorrect assembly during operation, leading to assembly failures without manual inspection. To address these issues, we propose an automatic 3D inspection method based on virtual-to-real registration that leverages cross-domain texture registration and 6D pose registration to align real assembly images with virtual 3D CAD models. This method conducts a 3D assembly inspection by assessing the similarities between real assembly and its virtual CAD instruction, not only from texture but also from spatial pose relations, improving inspection accuracy while retaining 2D real-time computing. By integrating the inspection results, the AR system can automatically verify assembly correctness and proceed to the next guide program only when a successful assembly is confirmed, eliminating any need for extra instructions from the operator. In case of assembly failure, the computed results are fed back to the operator to assist in correcting errors during assembly, thereby improving assembly efficiency. © 2025 The Society of Manufacturing Engineers

关键词： Augmented reality

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