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Experimental investigation of convective heat transfer on car radiator using Al2O3-water nanofluids

AIP Conference Proceedings 2023年第1期2680卷

作者： Wayan Nata Septiadi Komang Manik Marianti Anak Agung Gde Agung Krisnanta Dwipayana Dandi Ramadhani Abel Yosua Tommy Department of Mechanical Engineering Udayana University Badung Bali 80361 Indonesia Bachelor Program of Mechanical Engineering Udayana University Badung Bali 80361 Indonesia

Technological development refers to improving performance and checking dimensions, especially in car cooling systems. The impact of these developments causes an increase in the heat flux produced so that conventional cooling fluids cannot handle it and are starting to be abandoned. One of the most popular cooling systems in cars is the radiator. The use of nanoparticles has also begun to be widely used as an alternative working fluid, both as a working fluid for radiator cooling systems and as a working fluid and other cooling technologies. This test was performed on a simulated radiator cooling system on a standard car and varied the mass flow rate at 4 lpm; 3 lpm; 2 lpm and volume fraction 0. 1% on the composition of nanofluid Al2O3−Water and water-base fluid and the process of testing the heat transfer rate is carried out by heating the working fluid in the heating tank to 80°C then running it on the car radiator cooling system for 10 minutes and the visual results of the temperature drop will be read in the Labview program. The test results show that the higher the mass flow rate, the greater the heat transfer rate of the working fluid, In this test, the Al2O3−Water nanofluid showed a better heat transfer rate than.

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Understanding the effect of preparation technique and compaction pressure on the microstructure, sinterability and mechanical properties of the Cu-20 wt% WC composite prepared with recycled WC

Journal of Alloys and Compounds Communications

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Journal of Alloys and Compounds Communications 2025年 6卷

作者： Rafael A. Raimundo Franciné A. Costa Marco A. Morales Daniel A. Macedo Angelus G.P. Silva Uílame U. Gomes Federal University of Paraíba Department of Materials Science and Engineering João Pessoa PB 58051-900 Brazil TEMA – Centre for Mechanical Technology and Automation Department of Mechanical Engineering University of Aveiro Aveiro 3810-193 Portugal Mechanical Engineering Postgraduate Program UFRN Natal 59078-970 Brazil Department of Theoretical and Experimental Physics UFRN Natal 59078-970 Brazil Materials Science and Engineering Postgraduate Program UENF Campos dos Goytacazes 28015-620 Brazil Materials Science and Engineering Postgraduate Program UFRN Natal 59078-970 Brazil

The study investigated the impact of different preparation techniques (mechanical Mixing - MM and High Energy Milling - HEM) and compaction pressures on the microstructure, sinterability and mechanical properties of the Cu-20 %WC composite using recycled WC. The results indicated that HEM promotes greater homogeneity, dispersion and refinement of the WC phase in copper, resulting in denser and more uniform microstructures after sintering. Although higher pressures increased the density of green compacts, they reduced densification during sintering, especially for powders prepared by MM, due to the segregation of the Cu and WC phases. On the other hand, compacts sintered with HEM powders prsented higher Vickers microhardness and better magnetic properties, attributed to the uniform distribution of WC particles and the increase in the interaction between the phases. Furthermore, the study highlights the influence of metallic impurities (Fe, Co and Ni) on the magnetic properties of the composite materials.

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Correction: Tensile properties of 3D-printed PLA prismatic cellular structures: an experimental investigation

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The International Journal of Advanced Manufacturing Technology 2024年第3期135卷 1891-1891页

作者： Khan, Hashim Siddiqi, Muftooh Ur Rehman Saher, Saim Muhammad, Riaz Rehan, Muhammad Saad Mechanical Engineering Department CECOS University of IT & Emerging Sciences Peshawar Pakistan Mechanical Biomedical and Design Engineering Aston University Birmingham UK Advanced Materials Laboratory (AML) Ariston Energy Solutions Peshawar Pakistan Mechanical Engineering Department College of Engineering University of Bahrain Isa Town Bahrain U.S.-Pakistan Center for Advanced Studies in Energy University of Engineering and Technology Peshawar Pakistan

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A Brief Note on Building Augmented Reality Models for Scientific Visualization

arXiv

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arXiv 2022年

作者： Mathur, Mrudang Brozovich, Josef M. Rausch, Manuel K. University of Texas at Austin Department of Mechanical Engineering 204 E Dean Keeton Street AustinTX78712 United States University of Texas at Austin Department of Aerospace Engineering and Engineering Mechanics 2617 Wichita Street AustinTX78712 United States University of Texas at Austin Department of Biomedical Engineering 107 W Dean Keeton Street AustinTX78712 United States University of Texas at Austin Oden Institute for Computational Engineering and Sciences 201 E 24th Street AustinTX78712 United States

Augmented reality (AR) has revolutionized the video game industry by providing interactive, three-dimensional visualization. Interestingly, AR technology has only been sparsely used in scientific visualization. This is, at least in part, due to the significant technical challenges previously associated with creating and accessing such models. To ease access to AR for the scientific community, we introduce a novel visualization pipeline with which they can create and render AR models. We demonstrate our pipeline by means of finite element results, but note that our pipeline is generally applicable to data that may be represented through meshed surfaces. Specifically, we use two open-source software packages, ParaView and Blender. The models are then rendered through the platform, which we access through Android and iOS smartphones. To demonstrate our pipeline, we build AR models from static and time-series results of finite element simulations discretized with continuum, shell, and beam elements. Moreover, we openly provide python scripts to automate this process. Thus, others may use our framework to create and render AR models for their own research and teaching activities. © 2022, CC BY-NC-ND.

关键词： Augmented reality

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Targeted Ptpn11 deletion in mice reveals the essential role of SHP2 in osteoblast differentiation and skeletal homeostasis

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Bone Research 2021年第1期9卷 75-85页

作者： Lijun Wang Huiliang Yang Jiahui Huang Shaopeng Pei Liyun Wang Jian Q.Feng Dian Jing Hu Zhao Henry M.Kronenberg Douglas C.Moore Wentian Yang Department of Orthopedic Surgery Brown University Alpert Medical School and Rhode Island HospitalProvidenceRI 02903USA Department of Mechanical Engineering University of DelawareNewarkDE DE19716USA Department of Biomedical Sciences Texas A&M College of Dentistry3302 Gaston AveDallasTX 75246USA Department of Comprehensive Dentistry Texas A&M College of Dentistry3302 Gaston AveDallasTX 75246USA Endocrine Unit Massachusetts General Hospital and Harvard Medical SchoolBostonMA 02114USA

The maturation and function of osteoblasts(OBs)rely heavily on the reversible phosphorylation of signaling *** date,most of the work in OBs has focused on phosphorylation by tyrosyl kinases,but little has been revealed about dephosphorylation by protein tyrosine phosphatases(PTPases).SHP2(encoded by PTPN11)is a ubiquitously expressed ***11 mutations are associated with both bone and cartilage manifestations in patients with Noonan syndrome(NS)and metachondromatosis(MC),although the underlying mechanisms remain ***,we report that SHP2 deletion in bone gamma-carboxyglutamate protein-expressing(Bglap+)bone cells leads to massive osteopenia in both trabecular and cortical bones due to the failure of bone cell maturation and enhanced osteoclast activity,and its deletion in Bglap+chondrocytes results in the onset of enchondroma and osteochondroma in aged mice with increased tubular bone ***,SHP2 was found to be required for osteoblastic differentiation by promoting RUNX2/OSTERIX signaling and for the suppression of osteoclastogenesis by inhibiting STAT3-mediated RANKL production by osteoblasts and *** findings are likely to explain the compromised skeletal system in NS and MC patients and to inform the development of novel therapeutics to combat skeletal disorders.

关键词： skeletal homeostasis SHP2

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Electrocatalytic on-site oxygenation for transplanted cell-based-therapies

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Nature Communications 2023年第1期14卷 7019页

作者： Lee, Inkyu Surendran, Abhijith Fleury, Samantha Gimino, Ian Curtiss, Alexander Fell, Cody Shiwarski, Daniel J. Refy, Omar Rothrock, Blaine Jo, Seonghan Schwartzkopff, Tim Mehta, Abijeet Singh Wang, Yingqiao Sipe, Adam John, Sharon Ji, Xudong Nikiforidis, Georgios Feinberg, Adam W. Hester, Josiah Weber, Douglas J. Veiseh, Omid Rivnay, Jonathan Cohen-Karni, Tzahi Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh PA United States Department of Biomedical Engineering Northwestern University Evanston IL United States Department of Bioengineering Rice University Houston TX United States Department of Chemical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Electrical and Computer Engineering Northwestern University Evanston IL United States Department of Biomedical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Physics Carnegie Mellon University Pittsburgh PA United States Department of Computer Science Northwestern University Evanston IL United States Department of Material Science and Engineering The Pennsylvania State University State College PA United States Neuroscience Institute Carnegie Mellon University Pittsburgh PA United States Simpson Querrey Institute Northwestern University Chicago IL United States Interactive Computing and Computer Science Georgia Institute of Technology Atlanta GA United States Department of Mechanical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Materials Science and Engineering Northwestern University Evanston 60208 IL United States

Implantable cell therapies and tissue transplants require sufficient oxygen supply to function and are limited by a delay or lack of vascularization from the transplant host. Previous exogenous oxygenation strategies have been bulky and had limited oxygen production or regulation. Here, we show an electrocatalytic approach that enables bioelectronic control of oxygen generation in complex cellular environments to sustain engineered cell viability and therapy under hypoxic stress and at high cell densities. We find that nanostructured sputtered iridium oxide serves as an ideal catalyst for oxygen evolution reaction at neutral pH. We demonstrate that this approach exhibits a lower oxygenation onset and selective oxygen production without evolution of toxic byproducts. We show that this electrocatalytic on site oxygenator can sustain high cell loadings (>60k cells/mm³) in hypoxic conditions in vitro and in vivo. Our results showcase that exogenous oxygen production devices can be readily integrated into bioelectronic platforms, enabling high cell loadings in smaller devices with broad applicability. © 2023, The Author(s).

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Effect of serrated grain boundary on tensile and creep properties of a precipitation strengthened high entropy alloy

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Science and Technology of Advanced Materials 2023年第1期24卷 Article: 2158043页

作者： Lee, Jhuo-Lun Wang, Pei-Te Lo, Kai-Chi Shen, Pai-Keng Tsou, Nien-Ti Kakehi, Koji Murakami, Hideyuki Tsai, Che-Wei Gorsse, Stéphane Yeh, An-Chou High Entropy Materials Center National Tsing Hua University Hsinchu Taiwan Program in Prospective Functional Materials Industry National Tsing Hua University Hsinchu Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Mechanical Engineering Tokyo Metropolitan University Tokyo Hachiojishi Japan Research Center for Structural Materials National Institute for Materials Science Tsukuba Japan Department of Nanoscience and Nanoengineering Waseda University Tokyo Shinjuku Japan CNRS University of Bordeaux Bordeaux INP ICMCB UMR 5026 Pessac France

In this study, tensile and creep deformation of a high-entropy alloy processed by selective laser melting (SLM) has been investigated;hot ductility drop was identified at first, and the loss of ductility at elevated temperature was associated with intergranular fracture. By modifying the grain boundary morphology from straight to serration, the hot ductility drop issue has been resolved successfully. The serrated grain boundary could be achieved by reducing the cooling rate of solution heat treatment, which allowed the coarsening of L12 structured γ′ precipitates to interfere with mobile grain boundaries, resulting in undulation of the grain boundary morphology. Tensile and creep tests at 650°C were conducted, and serrated grain boundary could render a significant increase in tensile fracture strain and creep rupture life by a factor of 3.5 and 400, respectively. Detailed microstructure analysis has indicated that serrated grain boundary could distribute strains more evenly than that of straight morphology. The underlying mechanism of deformation with grain boundary serration was further demonstrated by molecular dynamic simulation, which has indicated that serrated grain boundaries could reduce local strain concentration and provide resistance against intergranular cracking. This is the first study to tackle the hot ductility drop issue in a high-entropy alloy fabricated by SLM;it can provide a guideline to develop future high-entropy alloys and design post heat treatment for elevated temperature applications. © 2023 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.

关键词： Grain boundaries

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Strength and Toughness of Silicide Matrix Materials Consolidated by Hot Isostatic Pressing

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MRS Online Proceedings Library 2020年第1期322卷 191-196页

作者： R. Suryanarayanan S. M. L. Sastry K. L. Jerina Materials Science & Engineering Program Department of Mechanical Engineering Washington University St. Louis USA

Substantial improvements have been reported in high temperature strength and creep resistance, and room temperature fracture toughness of molybdenum disilicide (MoSi2) reinforced with ductile or brittle reinforcements. The influence of Hot Isostatic Pressing (HIP) process parameters on the mechanical properties of MoSi2 based alloys was studied. Monolithic MoSi2 powder and MoSi2 powder blended with either niobium powder or silicon carbide whisker reinforcements were consolidated by HIP at 1200–1400°C, 207 MPa, and 1–4 hrs. The HIP’ed compacts were characterized for compression strength and creep resistance at 1100–1300°C. Fracture toughness was measured on single edge notched rectangular specimens at room temperature. mechanical properties were correlated with post-HIP microstructural features.

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Low-Temperature mechanical Alloying Of Cu-Fe and Cu-Ta Powders

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MRS Online Proceedings Library 2020年第1期481卷 637-642页

作者： He, J.-H. Ma, E. Materials Science and Engineering Program Department of Mechanical Engineering Louisiana State University Baton Rouge USA

A model analysis is presented which explains ball-milling induced alloying in positive-heatof- mixing systems in terms of a dynamic balance between externally forced mixing and thermal phase decomposition mediated by deformation-enhanced population of defects. The possibility of eliminating the thermal decomposition to force single phase formation is examined by milling Cu-Fe and Cu-Ta powder mixtures at the liquid nitrogen temperature (LN2T). Over a range of compositions for Cu-Fe and almost the entire composition range for Cu-Ta, the two-phase region observed for room-temperature (RT) milling persisted after cryomilling. The moderate temperature dependence of milling-induced alloying is interpreted by analyzing the dynamics of the generation and annihilation of the nonequilibrium vacancies during deformation and impacts in a SPEX mill.

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Single-Flow Multiphase Flow Batteries: Experiments

SSRN

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SSRN 2022年

作者： Ronen, Rona Gloukhovski, Robert Suss, Matthew E. The Nancy & Stephen Grand Technion Energy Program Technion-Israel Institute of Technology Haifa3200003 Israel Faculty of Mechanical Engineering Technion-Israel Institute of Technology Haifa3200003 Israel The Wolfson Department of Chemical Engineering Technion-Israel Institute of Technology Haifa3200003 Israel

The share of electricity generated from renewable sources is growing rapidly, and thus grid-scale battery storage is becoming more prevalent. Aqueous redox flow batteries have the potential to provide safe and scalable energy storage, but the high cost of storage, particularly the membrane and balance of plant costs, has inhibited commercialization. The recently developed single-flow battery leveraging a multiphase electrolyte promises a low-cost system, as it is membraneless and uses only one tank and flow loop, but suffers from low Coulombic efficiency. To unlock the potential of such a system, the interplay between interphase mass transport, multiphase flow phenomena, and battery performance must be unraveled. Here, we compare our novel battery theory including the latter effects to a dedicated experimental program. This led to several key findings, including that our battery operates in a regime characterized by a high Stanton number, and that our analytical solutions led to excellent predictions in several operational regimes when using the interphase mass transport coefficient as a single-valued fitting parameter. In other regimes, such as at low electrolyte velocity, we found that gravity acting on the denser polybromide phase played a significant role, and thus gravitational effects should be incorporated in future models. © 2022, The Authors. All rights reserved.

关键词： Electrolytes

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