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Improving the Performance of Asphalt Mixtures with Highly Acidic Aggregates in Central Vietnam Using Modifier Based on Styrene-Butadiene-Styrene and Rosin Resin

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Journal of materials in Civil engineering 2025年第7期37卷

作者： Nguyen, Lan Ngoc Lee, Hosin David Bui, Lam Tung Kim, Young-Ik Truong, Van Quyet Nguyen, May Huu Nguyen, Du Van Dept. of Construction Materials Faculty of Construction Engineering Univ. of Transport and Communications No. 03 Cau Giay Hanoi100000 Viet Nam Dept. of Civil and Environmental Engineering Iowa Technology Institute The Univ. of Iowa Iowa CityIA52242 United States Research Dept. Hansoo Natech Co. Ltd. 6-20 Yuseong-daero 1205beon-gil Yuseong-gu Daejeon34104 Korea Republic of Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima Univ. 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima739-8527 Japan Faculty of Civil Engineering Univ. of Transport and Communications Campus in Ho Chi Minh City Ho Chi Minh City700000 Viet Nam

In Central Vietnam, the aggregate typically originates from highly acidic rocks containing a significant amount of silicon dioxide (SiO2), leading to poor adhesion quality with virgin asphalt binder. Hence, the asphalt mixture production usually needs to utilize adhesion promoters. Based on the chemical compositions of the sample aggregate (up to 72.3% SiO2), research has been conducted to introduce an adhesive agent called rubber modified compound (RMC-160), which is composed of styrene-butadiene-styrene (SBS) with petroleum hydrocarbon resin, treated clay and mineral oil. This article presents the research findings regarding the adhesion effectiveness of RMC-160-modified asphalt binder to high acid-based aggregate through laboratory and field tests, along with the mixture performance under both short-term oven aging (STOA) and long-term oven aging (LTOA). The test results exhibited remarkable effects, whereby the asphalt binder modified with RMC-160 additive significantly increased the adhesion level from Grade 2 to Grade 4, and the asphalt mixtures containing RMC-160 had lower rutting and higher cracking tolerance (CTIndex) under both the STOA and LTOA conditions. © 2025 American Society of Civil Engineers.

关键词： Silicon oxides

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Small-Specimen Testing, with Image-Based Analysis, for Crack Propagation Resistance in Polygranular Nuclear Graphite

Small-Specimen Testing, with Image-Based Analysis, for Crack...

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2021 Symposium on Graphite Testing for Nuclear Applications: The Validity and Extension of Test Methods for Material Exposed to Operating Reactor Environments

作者： Marrow, James Scotson, Dan Jin, Xiaochao Chen, Hongniao Chen, Yang Koko, Abdo Earp, Philip Wu, Houzheng Dept. of Materials Oxford University Parks Rd. OxfordOX1 3PH United Kingdom State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi’an Jiaotong University Xi’an710049 China Space Structures Research Center Guizhou University Guiyang550003 China Dept. of Mechanical Engineering University of Bath North Rd Claverton DownBA2 7AY United Kingdom Culham Science Centre UKAEA Culham AbingdonOX14 3EB United Kingdom Dept. of Materials Loughborough University Epinal Way LoughboroughLE11 3TU United Kingdom

ISBN: (纸本)9780803177253

To enable monitoring of graphite that has been exposed to irradiated, high-temperature environments, there is a need for analysis methods that are suitable for fracture toughness measurements in small test specimens. Quasistatic fracture propagation has been studied for two candidate graphites for next-generation nuclear energy, SNG742 and T220, using small specimens in the double-cleavage drilled-compression (DCDC) geometry (20 7 7 mm). Compression of the DCDC specimen initiated stable crack propagation, and the surface full-field displacements were measured by digital image correlation. A phase congruency method was applied to the displacement field to quantify the crack lengths, crack opening displacements, and crack tip opening angles. The classical analytical solution for the stress intensity factor in the DCDC specimen gave unrealistic results due to its boundary condition assumptions. A new analysis method is proposed in which the measured crack displacement field is injected as boundary conditions into a finite element model, allowing the J-integral to be evaluated via the contour integral method, which then provides the mode 1 stress intensity factor during quasistatic crack propagation. With the assumption of linear elasticity, the critical stress intensity factor in T220 was constant for crack propagation up to 6 mm and lower than that in SNG742, which showed rising fracture resistance for longer cracks. The analysis was validated using Macor, a linear elastic fine-grained glass ceramic with known fracture toughness without significant R-curve behavior. The small-specimen graphite results are consistent with the reported fracture toughness from large-specimen tests, but the values are overestimations due to the nonlinear behavior of unirradiated graphite. Methods to extract nonlinear elastic properties by inverse analysis are discussed. The outlook for fracture testing of irradiated graphite at elevated temperatures is considered. Copyright 2022 by ASTM I

关键词： Fracture toughness

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Optical activity of chiral excitons

arXiv

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arXiv 2024年

作者： Sercel, Peter C. Hautzinger, Matthew P. Song, Ruyi Blum, Volker Beard, Matthew C. Center for Hybrid Organic–Inorganic Semiconductors for Energy GoldenCO80401 United States National Renewable Energy Laboratory GoldenCO80401 United States Dept. of Chemistry Duke University DurhamNC27708 United States Dept. of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States

Recent activity in the area of chiroptical phenomena has been focused on the connection between structural asymmetry, electron spin configuration and light matter interactions in chiral semiconductors. In these systems, spin-splitting phenomena emerge due to inversion symmetry breaking and the presence of extended electronic states, yet the connection to chiroptical phenomena is lacking. Here, we develop an analytical effective mass model of chiral excitons, parameterized by density functional theory. The model accounts for parity mixing of the band edge Bloch functions resulting from polar distortions, resulting in magnetic dipole allowed transitions. Through the study of a prototypical chiral 2D hybrid perovskite semiconductor, we show that circular dichroism of the chiral exciton and its interband continuum emerges from spin-splitting via cross coupling of Rashba-like and chiral/helical spin-texture components. As a counterpoint, we apply our model to describe chiroptical properties of excitons in perovskite nanocrystals that occur without chiral lattice distortions. Copyright © 2024, The Authors. All rights reserved.

关键词： Dichroism

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Liposomic Lubricants Suppress Acute Inflammatory Gene Regulation in the Joint in vivo

SSRN

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SSRN 2025年

作者： Zhu, Linyi Lin, Weifeng Kluzek, Monika Miotla-Zarebska, Jadwiga Batchelor, Vicky Gardiner, Matthew Chan, Chris Culmer, Peter Chanalaris, Anastasios Goldberg, Ronit Klein, Jacob Vincent, Tonia L. Kennedy Institute of Rheumatology Centre for OA Pathogenesis Versus Arthritis University of Oxford Roosevelt Drive OxfordOX3 7FY United Kingdom Dept. of Molecular Chemistry and Materials Science Weizmann Institute of Science Rehovot7610001 Israel School of Mechanical Engineering University of Leeds United Kingdom

Osteoarthritis (OA) is a widespread, debilitating joint disease associated with articular cartilage degradation. It is driven via mechano-inflammatory pathways, whereby catabolic genes in the cartilage-embedded chondrocytes are presumed up-regulated due to increased shear stress arising from friction at the cartilage surface as joints articulate. The enhanced expression of these cartilage-degrading and inflammatory genes lead to tissue degeneration. However, the nature of the stress, and how the cells within the joint respond to it, are poorly understood. Here we show, in a proof of concept study on a mouse model where surgical joint destabilisation has been carried out to induce OA, that the early up-regulation of the matrix metalloproteinase 3 (Mmp3) gene, a member of the matrix-degrading MMP family, and of the interleukin-1b (Il1b) gene, a key mediator of inflammatory response, is significantly suppressed when lipid-based lubricants are injected into the joints. We attribute this to the reduction in frictional stress on the chondrocytes due to the lubricant at the cartilage surface. At the same time, Timp1, a compression but not shear-stress sensitive gene, is unaffected by lubricant. Our results demonstrate that cartilage lubrication modulates catabolic gene regulation in OA, shed strong light on the nature of the chondrocytes’ response to shear stress, and have clear implications for novel OA treatments. © 2025, The Authors. All rights reserved.

关键词： Shear stress

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Correct-by-construction navigation functions with application to sensor based robot navigation

arXiv

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arXiv 2021年

作者： Loizou, Savvas G. Rimon, Elon D. Dept. of Mechanical and Materials Science Engineering Cyprus University of Technology Limassol Cyprus Dept. of Mechanical Engineering Technion Israel Institute of Technology Haifa Israel

This paper brings together the concepts of navigation transformation and harmonic functions to form navigation functions that are correct-by-construction in the sense that no tuning is required. The form of the navigation function is explicitly related to the number of obstacles in the environment. This enables application of navigation functions for autonomous robot navigation in partially or fully unknown environments, with the capability of on-the-fly adjustment of the navigation function when new obstacles are discovered by the robot. Appropriate navigation controllers, applicable to robots with local, sector bounded sensing, are presented and analyzed for a kinematic point-mass robot and then for the dynamic point-mass robot system. The closed form nature of the proposed navigation scheme provides for online, fast-feedback based navigation. In addition to the analytic guarantees, simulation studies are presented to verify the effectiveness of the methodology. © 2021, CC BY.

关键词： Navigation

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Investigation on cutting fluid use in finish milling of polylactide (PLA) 3D-printed parts

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Procedia CIRP 2025年 133卷 656-661页

作者： Margaux Lorenzoni Laurent Spitaels Edouard Rivière-Lorphèvre Jérémy Odent Rachid M’Saoubi Liam Cloëz Michaël Fontaine François Ducobu Machine Design and Production Engineering Lab – Research Institute for Materials Science and Engineering University of Mons Place du Parc 20 7000 Mons Belgium Laboratory of Polymeric and Composite Materials (LMPC) – Center of Innovation and Research in Materials and Polymers (CIRMAP) University of Mons Place du Parc 20 7000 Mons Belgium R&D Material and Technology Development Seco Tools AB Björnbacksvägen 2 SE-737 82 Fagersta Sweden Department of Mechanical Engineering Sciences - Division of Production and Materials Engineering Lund University Ole Römers väg 1 SE-221 00 Lund Sweden FEMTO-ST Institute – Applied Mechanics Dept. Université de Franche-Comté – SUPMICROTECH – CNRS Rue de l’épitaphe 24 F-25000 Besançon France

Fused Filament Fabrication (FFF) is an additive manufacturing process based on Material Extrusion (MEX) of polymeric filament. This manufacturing technology is commonly used for personalized production applications and prototyping, allowing to obtain customized parts with complex geometries at a low cost. However, this production technique has its limitations regarding dimensional accuracy and surface roughness of the final parts. To overcome these limitations, finish milling is considered to be a promising technique as it is widely used for metallic parts. Yet, the specific thermal properties of polymers such as low thermal conductivity and low melting temperature are adding a challenge in the determination of optimal cutting conditions. In this context, the use of cutting fluid could be the key to keep the material from melting during milling. Therefore, this paper proposes to compare the impact of using a compressed air flow to dry conditions on the cutting forces and the surface quality obtained on 3D-printed polylactide (PLA) parts. The qualification test of the tool-material couple standard (NF E 66-520-6) will be used as a guideline to determine the relevance of cutting fluid use for cutting conditions varying around an operating point. Moreover, simulated cutting forces using a mechanistic model will be compared to experimental data to evaluate the applicability of the model.

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Investigation of flexural strength of jute fiber based circular type honeycomb sandwich panel: An experimental and numerical approach

Results in Materials

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Results in materials 2023年 19卷

作者： Hosen, Asif Hossain, Md Foisal Rana, Muhammed Sohel Ferdous, Md Shafiul Department of Materials Science and Engineering Khulna University of Engineering & Technology Khulna 9203 Bangladesh Department of Electronics and Communication Engineering Khulna University of Engineering & Technology Khulna 9203 Bangladesh Central Engineering Facilities Atomic Energy Research Establishment Ganakbari Dhaka Savar 1349 Bangladesh Former Faculty Dept. of Mechanical Engineering Khulna University of Engineering & Technology Khulna 9203 Bangladesh

This study investigates the compression behavior of a circular type honeycomb sandwich panel. A custom-made handloom was constructed to weave the unidirectional jute mat using jute yarn. A hand-layup process was applied to fabricate the sandwich panels. Finite element modeling was undertaken to predict the experimental results. Prior to the finite element analysis, a tensile test was carried out to determine the boundary conditions for the finite element modeling. The corrosive impact on the bending property was also investigated. Furthermore, the swelling thickness and water absorption rate under pH 8 were investigated for thirty days to get saturated results. The test result revealed that the orientation of jute fiber had the greatest influence on the load-bearing capacity of the sandwich panel. 0° fiber orientation to the tensile loading direction gives four times higher strength than those with 90° loading direction samples. © 2023 The Authors

关键词： Composites Corrosive impact FEM Flexural strength Honeycomb core Sandwich panel

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Design and Characterization of Octave Spanning, 1-THz Kerr Frequency Microcombs in Silicon Nitride

Design and Characterization of Octave Spanning, 1-THz Kerr F...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Tristan Melton Alwaleed Aldhafeeri Hsiao Hsuan Chin Lala Rukh Gabriel M. Colación Tara E. Drake Chee Wei Wong Mesoscopic Optics and Quantum Electronics Laboratory University of California Los Angeles CA USA Optical Science & Engineering Program Center for High Technology Materials University of New Mexico Albuquerque NM USA Dept. of Physics & Astronomy University of New Mexico Albuquerque NM USA

We design microresonators for octave-spanning soliton frequency comb generation in silicon nitride. We lock the repetition rate via an electro-optic comb and achieve phase noise of -130-dBc/Hz, with the resultant modu... 详细信息

ISBN: (纸本)9798350369311

关键词： Phase noise Frequency modulation Laser noise Silicon nitride Solitons Electro-optic modulators Electro-optic effects Microcavities

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In silico drug delivery modeling of a novel Everolimus Coated Balloon

In silico drug delivery modeling of a novel Everolimus Coate...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Grigorios G. Kotoulas Vasileios S. Loukas Georgia S. Karanasiou Antonis I. Sakellarios Vasileios C. Pezoulas Christos C. Katsouras Lambros K. Michalis Arsen Semertzioglou Anargyros Moulas Liesbet Geris Dimitrios I. Fotiadis Dept. of Materials Science and Engineering Unit of Medical Technology and Intelligent Information Systems University of Ioannina Ioannina Greece Department of Mechanical and Aeronautics Engineering Laboratory of Biomechanics and Biomedical Engineering University of Patras Patras Greece Dept. of Cardiology Medical School University of Ioannina Ioannina GR Greece Rontis Corporation S.A Larisa Greece General Department University of Thessaly Larisa Greece Department of Biomechanics and Computational Tissue Engineering University of Liège KU Leuven Belgium Foundation for Research and Technology Hellas FORTH-BRI Biomedical Research Institute Ioannina Greece

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

This study examines the drug elution process of a novel Everolimus Coated Balloon (ECB) that features a novel polymer mixture consisting of cellulose derivatives and accelerators, and Everolimus as the pharmaceutical component, based on commercially available PTCA balloon-catheter system. In this analysis, we utilized in silico postdeployment results comprising three distinct datasets of healthy porcine arteries undergoing PTCA with (a) Sirolimus, (b) Low-dose Everolimus, and (c) High-dose Everolimus. We developed a computational model that consists of the drug release from the balloon surface and the drug transport through the porous arterial wall given advection and diffusion properties. The comparative results of the current study highlight that: (a) among the high and low-dose Everolimus Eluting Balloons, diffusivity is the governing property and as such, respective amount of drug is eluted and bound by the arterial wall – effectively rendering the high-dose balloon powerful in its delivery properties, and (b) based on the diffusivity of Everolimus and Sirolimus, the Everolimus Eluting Balloons exhibit superior performance with respect to total bound drug of the arterial *** Relevance—The approach described in this article is a step farther toward precision drug release from DCB prediction. Furthermore, our study's findings demonstrate that higher drug concentration in the coating leads to higher binding amounts; this information could be utilized to inform the creation of novel Drug Coated Balloon (DCB).

关键词： Drugs Computational modeling Biological system modeling Cellulose Rendering (computer graphics) Drug delivery Coatings engineering in medicine and biology Arteries

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Improvement of Battery Performance by Applying Iron-Containing Recycled Aluminium to Current Collector-Free Anode of Lithium-Ion Batteries

SSRN

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SSRN 2023年

作者： Kayanuma, Kenta Hirosawa, Shoichi Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan Dept. Mechanical Engineering and Materials Science Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan

Lithium-ion batteries with graphite anode have been utilized in a condition close to the theoretical capacity of graphite, and thus the application of current collector-free aluminum anode has been attempted for further increase in capacity because theoretical capacity of aluminum is 2.7 times larger than that of graphite. In this study, Al-2mass%Fe alloy was applied as a noble anode material, and found to possess better discharge capacity retention and Coulomb efficiency than those of 4N-purity aluminum. Such improvement of battery performance in Al-2mass%Fe anode is attributed to the formation of more stable reaction layers of randomly oriented nanocrystalline AlLi owing to finely dispersed intermetallic compounds of Al6Fe and Al3Fe. This result would expand application ranges of recycled aluminum containing larger amounts of impurity iron, with less future demand from foundry industries to be partly compensated. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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