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Micromechanical origin of heat transfer to granular flow

Physical Review E 2024年第4期109卷 L042902-L042902页

作者： Xintong Zhang Sarath Adapa Tianshi Feng Jian Zeng Ka Man Chung Clifford Ho Kevin Albrecht Renkun Chen Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla California 92093 USA Program in Materials Science and Engineering University of California San Diego La Jolla California 92093 USA Concentrating Solar Technologies Department Sandia National Laboratories 1515 Eubank Boulevard SE Albuquerque New Mexico 87123 USA

Heat transfer across a granular flow is comprised of two resistances in series : near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contribution. Here, we use a frequency modulated photothermal technique to separately quantify the thermal resistances in the near-wall and the bulk bed regions of particles in flowing states. Compared to the stationary state, the flowing leads to a higher near-wall resistance and a lower thermal conductivity of bulk beds. Coupled with discrete element method simulation, we show that the near-wall resistance can be explained by particle diffusion in granular flows.

关键词： Fluidized beds Granular flows Granular materials Granular packing Interparticle interactions

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Ronchigram Simulation and Training through ***

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Microscopy Today 2022年第5期30卷 40页

作者： Suk Hyun Sung Noah Schnitzer William Millsaps Lena F. Kourkoutis Robert Hovden Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 Department of Materials Science and Engineering Cornell University Ithaca NY 14853 Engineering Physics Program University of Michigan Ann Arbor MI 48109 School of Applied and Engineering Physics Cornell University Ithaca NY 14853 Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca NY 14853

This article introduces a training simulator for electron beam alignment using Ronchigrams. The interactive web application, , is an advanced educational tool aimed at making scanning transmission electron microscopy (STEM) more accessible and open. For experienced microscopists, the tool offers on-hand quantification of simulated Ronchigrams and their resolution limits.

关键词： Ronchigram scanning transmission electron microscopy aberration correction image simulation software

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Synergistic effects of natural fibres and agro-waste ash on the engineering and sustainability of stone-matrix asphalt mixes

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International Journal of Transportation science and Technology 2025年

作者： Akarsh, P.K. Marathe, Shriram Sapal, Harsimran Kaur Akshaya Krishna, N. Surathkal575025 India Nitte574110 India Manav Rachna International Institute of Research and Studies Haryana Faridabad121004 India Moodabidre574225 India Department of Materials Engineering and Construction Processes Faculty of Civil-Engineering Wroclaw University of Science and Technology: Politechnika Wroclawska 27 Wroclaw50-370 Poland

This study investigates the use of non-traditional natural fibres, specifically sisal plant fibres (SF) and coconut coir coir fibres (CCF), in Stone Matrix Asphalt (SMA) mixtures. The objective was to evaluate the optimal binder content, assess Marshall properties, and investigate drain-down, indirect tensile strength, fatigue, and rutting characteristics of the SMA mixes. Additionally, the study explores the use of sugarcane bagasse ash (SBA), an agro-waste, as a substitute for Ordinary Portland Cement (OPC), aiming to promote sustainability and waste management optimization. The research identified the optimal SMA mix with a 0.30% fibre dosage and 10% SBA, demonstrating favorable mechanical properties with Marshall stability and tensile strength ratio exceeding 90%, alongside satisfactory rutting and fatigue performance. The results showed that SF and CCF provided comparable, or even superior, performance to traditional cellulose fibres (CF), positioning them as sustainable alternatives for pavement construction. Further, a Life Cycle Cost Analysis (LCCA) was conducted on conventional and modified SMA mixes, revealing substantial long-term economic benefits. Although SMA mixes incurred slightly higher initial costs, their superior durability and reduced maintenance needs resulted in a 13.6% cost reduction for SMA-CCF and 11.1% for SMA-SF over a 20-year period. Environmental assessments confirmed that substituting synthetic fibres and OPC with SF, CCF, and SBA substantially lowered carbon emissions and enhanced sustainability, with reductions in Global Warming Potential of up to 50%. These findings highlight the potential of natural fibres and SBA in reducing costs and environmental impacts, offering a sustainable solution for future pavement construction. © 2025 Tongji University and Tongji University Press

关键词： Cost reduction

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900 MHz RF Power Rectifier Based on Ultra-low Turn-on Voltage Quasi-vertical GaN Schottky Diode

900 MHz RF Power Rectifier Based on Ultra-low Turn-on Voltag...

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Wireless Power Week (WPW)

作者： Xiaochen Yu Ya-Xun Lin Ivona Z. Mitrovic Steve Hall Der-Sheng Chao Jenq-Horng Liang Yi Huang Ta-Jen Yen Jiafeng Zhou International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu Taiwan Department of Electrical Engineering and Electronics University of Liverpool Liverpool United Kingdom Nuclear Science and Technology Development Center National Tsing Hua University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan

ISBN: (数字)9798350349139

ISBN: (纸本)9798350349146

This paper presents a 20 W high-power RF-to-DC rectifier that can be applied to wireless power transfer (WPT) systems. To address the power limitations of conventional diodes, a rectifier is designed based on a gallium nitride (GaN) integrated circuit (IC) quasi-vertical Schottky barrier diode (SBD). Leveraging the advantages of high mobility, wide bandgap, and saturation velocity of the GaN, significant benefits of the diode have been derived, with an ultra-low turn-on voltage of 0.23 ± 0.005 V (at 1 A/cm 2 ) and a high breakdown voltage of 180 V, to improve the rectification performance. Using this diode, a high-power rectifier with a wide input power range and high efficiency is developed. The proposed rectifier structure consists of a single-shunt self-developed diode and a topology with class-F harmonics control networks. It achieves a peak power conversion efficiency of 72.9% with an input power of 43 dBm at 900 MHz.

关键词： Wireless communication Integrated circuits Schottky diodes Wireless sensor networks Breakdown voltage Rectifiers Wireless power transfer

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High fluorescent carbon dots/Ag as a sensitive sensor for tetracycline waste in aqueous solution 10

High fluorescent carbon dots/Ag as a sensitive sensor for te...

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10th International Seminar on New Paradigm and Innovation of Natural sciences and itsApplication, ISNPINSA 2020

作者： Alkian, I. Sutanto, H. Hadiyanto, H. Hidayanto, E. Hapsari, H.P. Wibowo, A.A. Syahida, A.N. Irianti, F.D.D. Master Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Departemen of Physics Faculty of Science and Mathematics Diponegoro University Semarang Indonesia Departemen of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia Smart Materials Research Center Laboratory Diponegoro University Semarang Indonesia

Currently, antibiotics waste produced by hospitals and pharmacies is increasing, increasing demand and public consumption. Tetracyclines are a popular type of antibiotic that can pollute the environment even in low concentrations. This study aimed to detect tetracyclines in an aqueous environment using C-dots/Ag. C-dots material was synthesized by microwave radiation method with the addition of Ag 0-4 %. C-dots/Ag is produced in the form of a brown-black powder that glows green. FTIR testing shows that C-dots/Ag contains various functional groups O-H, N-H, C-H, C=O, and C=C. The surface morphology of the C-dots based on SEM testing is round and rough. Ag's addition causes C-dots' surface morphology to agglomerate, shifting the C-dots' absorbance peaks towards a larger wavelength and decreasing the energy bandgap. C-dots/Ag 2% has the best optical properties based on the intensity of the resulting fluency. In general, C-dots/Ag has excellent potential to be a susceptible, selective, and effective tetracycline detection agent. © Published under licence by IOP Publishing Ltd.

关键词： Surface morphology

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Correlating the electronic structures of metallic/semiconducting MoTe2 interface to its atomic structures

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National science Review 2021年第2期8卷 108-114页

作者： Bo Han Chen Yang Xiaolong Xu Yuehui Li Ruochen Shi Kaihui Liu Haicheng Wang Yu Ye Jing Lu Dapeng Yu Peng Gao Electron Microscopy Laboratory and International Center for Quantum Materials School of PhysicsPeking University Department of Material Physics and Chemistry University of Science and Technology Beijing State Key Laboratory for Artificial Microstructure &Mesoscopic Physics School of PhysicsPeking University Academy for Advanced Interdisciplinary Studies Peking University Collaborative Innovation Center of Quantum Matter State Key Laboratory of Advanced Materials for Smart Sensing GRINM Group Co.Ltd.Beijingand GRIMAT Engineering Institute Co.Ltd. Shenzhen Key Laboratory of Quantum Science and Engineering

Contact interface properties are important in determining the performances of devices that are based on atomically thin two-dimensional（2D） materials, especially for those with short channels. Understanding the contact interface is therefore important to design better devices. Herein, we use scanning transmission electron microscopy, electron energy loss spectroscopy, and first-principles calculations to reveal the electronic structures within the metallic（1T）-semiconducting（2H） MoTe2coplanar phase boundary across a wide spectral range and correlate its properties to atomic structures. We find that the 2 H-MoTe2excitonic peaks cross the phase boundary into the 1 T phase within a range of approximately 150 nm. The1 T-MoTe2crystal field can penetrate the boundary and extend into the 2H phase by approximately two unit-cells. The plasmonic oscillations exhibit strong angle dependence, that is a red-shift of π +σ（approximately 0.3–1.2 e V） occurs within 4 nm at 1 T/2 H-MoTe2boundaries with large tilt angles, but there is no shift at zero-tilted boundaries. These atomic-scale measurements reveal the structure–property relationships of the 1 T/2 H-MoTe2boundary, providing useful information for phase boundary engineering and device development based on 2 D materials.

关键词： MoTe2 phase engineering coplanar phase boundary EELS

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Assessment of Simple Adhesive Substrates as a Method for Quantifying Microplastics and the Factors Influencing Capture

SSRN

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SSRN 2022年

作者： Rieland, Julie M. Hu, Zeyuan Deese, Julian S. Love, Brian J. Department of Materials Science and Engineering United States Department of Biomedical Engineering United States Macromolecular Science and Engineering Graduate Program 2300 Hayward St Ann ArborMI48109 United States

Microplastics are a growing environmental concern, with a large body of evidence documenting substantial distribution of plastic material in virtually all environmental compartments. Countermeasures that help to bind, aggregate, or coalesce these distributed particles might result in lower human and animal exposures. Pressure sensitive adhesives (PSAs) have been identified as a viable microplastic (MP) capture mechanism with a range of potential use conditions. As with any countermeasure, there is a need to evaluate their collection efficiency, cost, ease of installation, etc. Expanding on previous work, submerged, spray-coated PSAs were investigated as a quick and low-cost quantitative method to assess MP binding in water. Two molecular weights of poly(2-ethylhexyl acrylate) PSA (92k, 950k, and 50:50 bimodal distribution) were applied as spray-coated substrates to compare MP-adhesive interactions. Thin films of PSA (92k 6 ± 1 μm, 950k 4 ± 2 μm, 50:50 BD 6.5 ± 1 μm) were sprayed on borosilicate glass slides using a commercial air brush. Polydisperse nylon-12 particles varying in size from 15-30 µm in diameter were dispersed in aqueous solution between 0.01 and 5 mg mL -1 and agitated under ambient conditions as quantitative comparisons of adhesive wettability and net capture. Mixed assays were also performed comparing binding of common MP species including polyethylene, polystyrene, and polyester particles and fibers to understand how varying composition, size, and form factor affect adsorption. The glass slide method demonstrated linear trends associated with the MP binding to glass slides with respect both to exposure time and MP concentration. The adhesive wettability demonstrates bounding parameters under which high wettability adhesives excel at MP capture but may compromise the integrity of the adhesive film. © 2022, The Authors. All rights reserved.

关键词： Adhesives

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Selective Co ALD for Chiplet-to-Wafer and Wafer-to-Wafer Bonding

Selective Co ALD for Chiplet-to-Wafer and Wafer-to-Wafer Bon...

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IEEE International Conference on Interconnect Technology

作者： Cheng-Hsuan Kuo Madison Manley Dipayan Pal Rohan Sahay Ravindra Kanjolia Jacob Woodruff Muhannad Bakir Andrew C. Kummel Mansour Moinpour Jeff Spiegelman Materials Science and Engineering Program University of California San Diego USA Georgia Institute of Technology Georgia USA Department of Chemistry and Biochemistry University of California San Diego EMD Electronics Rasirc

ISBN: (数字)9798350385175

ISBN: (纸本)9798350385182

cyclic clean treatment by using strong oxidant: HOOH and reductant: N2H4 was developed for Cu cleaning which can be applied in the inverse hybrid metal bonding process. Compared to UHV anneal at higher temperature (415C), cyclic clean process is only performed at 340C with lower surface impurities. Also, highly selective Co ALD is deposited on metal Cu but not on SiO2 even after 1000 ALD cycles.

关键词： Wafer bonding Surface cleaning Silicon compounds Annealing Impurities Metals Bonding

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Alkali-silica reaction: understanding the phenomenon

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Journal of Building Pathology and Rehabilitation 2021年第1期6卷 1-10页

作者： Moreira, Kelvya Maria de Vasconcelos Oliveira, Paulo Vítor Gomes de Deus, Ênio Pontes Cabral, Antônio Eduardo Bezerra Engineering and Materials Science Federal University of Ceara Pici Campus Fortaleza Ceara Brazil Civil Engineering Course Vale of Acarau State University Cidao Campus Av. Dr. Guarany 317 Sobral Ceara Brazil Civil Construction Materials Laboratory Federal University of Ceara Pici Campus Fortaleza Ceara Brazil Program in Engineering and Materials Science Federal University of Ceara Pici Campus Fortaleza Ceara Brazil Program in Civil Engineering Federal University of Ceara Pici Campus Fortaleza Ceara Brazil

The alkali-silica reaction in cementitious composites occurs through the chemical association of the solution contained in the matrix pores, which is strongly basic and rich in alkalis, and the reactive phases of some aggregates. For the process to begin, high relative humidity and a high concentration of total alkalis are required. The degradations resulting from this reaction involve expansion, cracking, exudation and decreased mechanical performance of the structure, which can cause it to break depending on the magnitude of the phenomenon. Understanding the reaction development process is necessary to propose measures that can effectively extinguish or mitigate the occurrence. One of the measures widely studied is the incorporation of supplementary cementitious materials in concrete. In Brazil, technical regulations already exist that recommend the use of these cementitious materials. The Northeast region of the country is a major producer of fly ash and granulated blast furnace slag, but not all of this material is destined for other industries. The article in question is a compendium of technical information from relevant research developed about alkali-silica reaction. His contribution is in the didactic approach that allows the understanding of students in the engineering area and professionals who do not have the expertise in the subject in order to stimulate future research on the use of supplementary cementitious materials in Northeast Brazil, mainly. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.

关键词： Alkali-silica reaction Diagnosis Mitigation measures Occurrence mechanism Review Supplementary cementitious materials

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Assembly of N-and P-functionalized carbon nanostructures derived from precursor-defined ternary copolymers for high-capacity lithiumion batteries

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Chinese Journal of Chemical engineering 2023年第1期53卷 280-288页

作者： Luyao Guo Mengru Wang Ronghe Lin Jiaxin Ma Shuanghao Zheng Xiaoling Mou Jun Zhang Zhong-Shuai Wu Yunjie Ding Hangzhou Institute of Advanced Studies Zhejiang Normal UniversityHangzhou 311231China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Yuquan Road 19AShijingshan DistrictBeijing 100049China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesZhongshan Road 457Dalian 116023China

Synthesis of new carbon nanostructures with tunable properties is vital for precisely regulating electrochemical performance in the wide ***,we report a novel approach for the oxidative polymerization of N-and P-bearing copolymers from the self-assembly of three different monomers(aniline,pyrrole,and phytic acid),and further prepare the respective carbon nanostructures with relatively consistent N dopant(6.2%–8.0%,atom)and varying P concentrations(0.4%–2.8%,atom)via controllable *** impacts of phytic acid addition on the compositional,structural,and morphological evolution of the copolymers and the resulting nanocarbons are well studied through a spectrum of characterizations including N2 sorption,Fourier transform infrared spectroscopy,gel permeation chromatograph,scanning/transmission electron microscopy,and X-ray photoelectron *** fragmentation of the nanosphere structures is evidenced with increasing addition of phytic acid,leading to different nanostructures from hollow nanospheres to 3D *** decorated with N and P dopants from pyrolysis are further utilized as anode materials in lithium-ion batteries,demonstrating enhanced electrochemical performance,i.e.,a reversible capacity of 380 mAhg^(-1)at 2 Ag^(-1)for NPC-0.5 during 200 *** superior performance originates from the balanced porosity,and appropriate concentrations of P and pyrrolic N,thus pointing the direction for designing high-performance anode materials.

关键词： Carbon nanospheres Doping Lithium-ion batteries Polymers Porosity

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