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The effects of Pulsed Green Laser Annealing for Carbon NanoWalls (CNWs)

MRS Online Proceedings Library 2013年第1期1505卷 1-6页

作者： Kawaguchi, Norihito Yoshimura, Akihiko Advanced Applied Science Dept. Research Laboratory IHI Corporation Isogo-ku Yokohama Japan Mechanical Technology Dept. Products Development Center IHI Corporation Isogo-ku Yokohama Japan

The effects of the pulsed green laser annealing at ambient nitrogen for two different heights-CNWs grown on silicon substrate were investigated on the crystallinity and morphology using Raman spectroscopy, SEM, TEM and XPS. For the 1μm height-CNWs, the peak intensity of D-band spectra decreased as the laser energy density increased up to 1.3Jcm-2, ID/IG ratio decreased from 2.5 to 0.7. The crystallinity of CNWs was improved by the laser irradiation. For the 1μm height-CNWs irradiated above 1.5Jcm-2, the height of CNWs decreased gradually as the laser energy density increased, it was clarified that the surfaces of CNWs were vaporized by the laser irradiation. For the 20μm height-CNWs, the peak intensity of D band spectra also decreased until the laser energy density increased up to 0.8Jcm-2, ID/IG ratio decreased from 1.6 to 0.5. From the TEM observation of CNWs irradiated at 0.8 Jcm-2, it was confirmed that the laser irradiation changed CNWs to be highly oriented crystal structure. However above 0.8Jcm-2, the crystallinity was deteriorated due to the vaporization of CNWs as the same as the 1μm height-CNWs. The pulsed green laser annealing is effective to improve the crystallinity of CNWs on optimal laser energy density for both height-CNWs, the higher laser energy densities vaporized the CNWs and changed the morphology and crystallinity of CNWs.

关键词： laser annealing nanostructure Raman spectroscopy

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CuSx-mediated two reaction systems enable biomimetic photocatalysis in CO_(2) reduction with visible light

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Journal of Energy Chemistry 2022年第2期31卷 497-504页

作者： Ling-Xiang Wang Zhi-Qiang Wang Liang Wang Zhiyuan Yang Qiuyan Zhu Yifeng Liu Wei Fang Xue-Qing Gong Yuefeng Liu Xiaolong Liu Feng-Shou Xiao Key Laboratory of Applied Chemistry of Zhejiang Province Department of ChemistryZhejiang UniversityHangzhou 310028ZhejiangChina Key Lab of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina Key Laboratory for Advanced Materials and Joint International Research Laboratory for Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterCentre for Computational Chemistry and Research Institute of Industrial CatalysisSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Dalian National Laboratory for Clean Energy(DNL) Dalian Institute of Chemical Physics(DICP)Chinese Academy of ScienceDalian 116023LiaoningChina State Key Laboratory of Optoelectronic Materials and Technologies School of MaterialsSun Yat-Sen UniversityGuangzhou 510275GuangdongChina

The performances of heterogeneous catalysts can be effectively improved by optimizing the catalysts via appropriate structure ***,we show that the catalysis of cuprous sulfide can be boosted by constructing the hybrid structure with Cu_(2)S nanoparticles on amorphous CuSx matrix(Cu_(2)S/CuSx).In the photocatalytic CO_(2) reduction under visible light irradiation,the Cu_(2)S/CuSx exhibited a CO production rate at 4.0μmol h-1 that is 12-fold higher than that of the general Cu_(2)S *** characterizations reveal that the Cu_(2)S/CuSx has two reaction systems that realize the biomimetic catalysis,involving in the light reaction on the Cu_(2)S nanoparticle-CuSx matrix heterojunctions for proton/electron production,and the dark reaction on the defect-rich CuSx for CO_(2) *** CuSx matrix could efficiently activate CO_(2) and stabilize the split hydrogen species to hinder undesired hydrogen evolution reaction,which benefits the proton-electron transfer to reduce CO_(2),a key step for bridging the two reaction systems.

关键词： CO_(2) Photoreduction Bifunctional catalyst Proton-coupled electron transfer

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Inserted Al2O3Barrier Layer for Improvement in Stability of Mini Light Emitting Diodes

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IEEE Transactions on Electron Devices 2023年第10期70卷 5163-5168页

作者： Hsu, Chia-Hsun Luo, Hai-Long Li, Shi-Tao Bian, Fu-Qiang Gao, Peng Wu, Wan-Yu Wuu, Dong-Sing Lai, Feng-Min Lien, Shui-Yang Zhu, Wen-Zhang Xiamen University of Technology Xiamen Key Laboratory of Development and Application for Advanced Semiconductor Coating Technology School of Opto-Electronic and Communication Engineering Xiamen361026 China Silan Academy of Compound Semiconductor Technology Xiamen361026 China Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian350002 China National United University Department of Materials Science and Engineering Miaoli36063 Taiwan National Chi Nan University Department of Applied Materials and Optoelectronic Engineering Puli54561 Taiwan Da-Yeh University Department of Biomedical Engineering Changhua51591 Taiwan

In this work, aluminum oxide (Al2O3) films are grown using atomic layer deposition (ALD) with trimethylaluminum (TMA) and water, and inserted into blue mini-light-emitting diodes (mini-LEDs) as a moisture barrier layer to provide chip-level encapsulation. The effect of the inserted Al2O3 layer on the stability of the mini-LED performance is investigated. The experimental results show that the optimized substrate temperature for preparing the Al2O3 films under self-limiting surface reaction conditions and linear growth is in the range of 200 °C-250 °C. The highest film density, lowest impurity content, and lowest water vapor transmission rate (WVTR) can be obtained at 250 °C. The performance of the mini-LEDs with the Al2O3 layer does not degrade after 1000 h in 85% relative humidity (RH) and 85 °C temperature aging conditions, while the device without the moisture layer completely fails after 500 h. The degradation is found to be related to the increased series resistance and ideality factor of the devices. Moreover, it is found that the addition of the Al2O3 moisture layer improves the light intensity of mini-LEDs. The inserted Al2O3 layer with a simple process and thin thickness is therefore capable of providing excellent resistance against high humidity and high temperature environment for mini-LEDs. © 1963-2012 IEEE.

关键词： Aluminum oxide

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The Engagement of Hybrid Ultra High Space Division Multiplexing with Maximum Time Division Multiplexing Techniques for High-Speed Single-Mode Fiber Cable Systems

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Journal of Optical Communications 2022年第2期43卷 219-223页

作者： Amiri, I.S. Kuppusamy, P.G. Rashed, Ahmed Nabih Zaki Jayarajan, P. Thiyagupriyadharsan, M.R. Yupapin, P. Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City700000 Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City700000 Viet Nam Department of ECE Siddharth Institute of Engineering and Technology Andhra Pradesh Puttur India Electronics and Electrical Communications Engineering Department Menoufia University Faculty of Electronic Engineering menoufia Menouf32951 Egypt Department of ECE Sri Krishna College of Technology Kovaipudur Coimbatore India

High-speed single-mode fiber-optic communication systems have been presented based on various hybrid multiplexing schemes. Refractive index step and silica-doped germanium percentage parameters are also preserved during their technological boundaries of attention. It is noticed that the connect design parameters suffer more nonlinearity with the number of connects. Two different propagation techniques have been used to investigate the transmitted data rates as a criterion to enhance system performance. The first technique is soliton propagation, where the control parameters lead to equilibrium between the pulse spreading due to dispersion and the pulse shrinking because of nonlinearity. The second technique is the MTDM technique where the parameters are adjusted to lead to minimum dispersion. Two cases are investigated: no dispersion cancellation and dispersion cancellation. The investigations are conducted over an enormous range of the set of control parameters. Thermal effects are considered through three basic quantities, namely the transmission data rates, the dispersion characteristics, and the spectral losses. © 2019 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Single mode fibers

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Thermally Radiative Casson Fluid Flow over a Cylinder with Newtonian Heating and Heat generation/absorption 1

Thermally Radiative Casson Fluid Flow over a Cylinder with N...

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1st International Conference on Advances in computational science and Engineering, ICACSE 2020

作者： Loganathan, K. Sivakumar, M. Mohanraj, M. Sakthivel, P. Research and Development Wing Live4Research Tamil Nadu Tiruppur638 106 India Department of Applied Mathematics and Computational Science PSG College of Technology Tamil Nadu Coimbatore641 004 India Department of Mechanical Engineering Hindusthan College of Engineering and Technology Tamil Nadu Coimbatore641 032 India Department of Physics Faculty of Engineering Karpagam Academy of Higher Education Tamil Nadu Coimbatore641 021 India

This communication explains the impact of thermally radiative flow of a Casson fluid over a cylinder with velocity slip, suction/injection, and Newtonian heating condition. The governing PDE expressions are remodeled into an ODE expressing by applying suitable variables. The homotopy analysis (HAM) technique was implemented for solving our models. The impact of velocity field, temperature distribution, skin friction coefficient, Nusselt number in terms of diverse physical parameters like Casson parameter, suction/injection parameter, Newtonian heating parameter, radiation parameters, heat generation/absorption, Hartmann number and velocity slip parameter. The Hartmann number leads to slow down the fluid velocity, skin friction coefficient and local Nusselt number. The slip parameter decreases the fluid velocity and enhance the fluid heat transfer gradient. © Published under licence by IOP Publishing Ltd.

关键词： Nusselt number

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Phase-field simulations of the effect of temperature and interface for zirconium δ-hydrides

arXiv

引用

arXiv 2023年

作者： Chen, Zi-Hang Sheng, Jie Liu, Yu Shi, Xiao-Ming Huang, Houbing Xu, Ke Wang, Yue-Chao Wu, Shuai Sun, Bo Liu, Hai-Feng Song, Hai-Feng School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing100081 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100088 China Department of Physics University of Science and Technology Beijing Beijing100083 China

Hydride precipitation in zirconium cladding materials can damage their integrity and durability. Service temperature and material defects have a significant effect on the dynamic growth of hydrides. In this study, we have developed a phase field model based on the assumption of elastic behaviour within a specific temperature range (613-653K). This model allows us to study the influence of temperature and interfacial effects on the morphology, stress, and average growth rate of zirconium hydride. The results suggest that changes in temperature and interfacial energy influence the aspect ratio and average growth rate of the hydride morphology. The ultimate determinant of hydride orientation is the loss of interfacial coherence, primarily induced by interfacial dislocation defects and quantifiable by the mismatch degree q. An escalation in interfacial coherence loss leads to a transition of hydride growth from horizontal to vertical, accompanied by the onset of redirection behaviour. Interestingly, redirection occurs at a critical mismatch level, denoted qc, and remains unaffected by variations in temperature and interfacial energy. However, this redirection leads to an increase in the maximum stress, which may influence the direction of hydride crack propagation. This research highlights the importance of interfacial coherence and provides valuable insights into the morphology and growth kinetics of hydrides in zirconium alloys. Copyright © 2023, The Authors. All rights reserved.

关键词： Hydrides

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Physico-chemical parameters for the assembly of moxifloxacin hydrochloride and cetyltrimethylammonium chloride mixture in aqueous and alcoholic media

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Chinese Journal of Chemical Engineering 2023年第5期57卷 280-289页

作者： Arnop Dutta Md.Tuhinur R.Joy Sk.Md.Ali Ahsan Mansour K.Gatasheh Dileep Kumar Malik Abdul Rub Md.Anamul Hoque Mohammad Majibur Rahman Nasrul Hoda D.M.Shafiqul Islam Department of Chemistry Jahangirnagar UniversitySavarDhaka 1342Bangladesh Department of Chemistry Jashore University of Science and TechnologyJashore 7408Bangladesh Department of Biochemistry College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia Laboratory for Chemical Computation and Modeling Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh CityViet Nam Faculty of Applied Technology Van Lang UniversityHo Chi Minh CityViet Nam Center of Excellence for Advanced Materials Research King Abdulaziz UniversityJeddah 21589Saudi Arabia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Environmental Sciences Jahangirnagar UniversitySavarDhaka 1342Bangladesh Department of Neurology Henry Ford Health SystemDetroitMI 48292USA

The aggregation behavior of the mixture of cetyltrimethylammonium chloride(CTAC), a cationic surfactant, and moxifloxacin hydrochloride(MFH), a fourth-generation fluoroquinolone antibiotic drug, has been studied using the conductivity technique in aqueous and alcoholic(EtOH, 1-PrOH, and 2-BuOH)media. The study was performed at several temperatures between 298.15 and 323.15 K at 5 K *** assembly has been characterized by evaluating the micellar parameters, such as the critical micelle concentration(CMC) and the counter ion binding(β), of the CTAC + MFH mixture. The values of the CMC for the assembly of the CTAC + MFH mixture were reliant on the composition of alcohols in the mixed solvents and the temperature. The CMC values of the CTAC + MFH mixture increased with increasing temperature;that is, assembly was delayed by increased temperature. The micellization of the CTAC + MFH mixed system was delayed in alcoholic media. The observed-ΔG0mvalues for the association of the CTAC + MFH mixed system demonstrated a spontaneous aggregation process under all study *** on the-ΔH^(0)_(m) and +ΔS^(0)_(m) values, the association of the CTAC + MFH mixture is exothermic and the interaction forces acting between the CTAC and MFH species are hydrophobic, ion–dipole, and electrostatic interactions. The transfer properties and enthalpy–entropy compensation were also assessed and described comprehensively.

关键词： Moxifloxacin hydrochloride drug Aggregation Alcohol Hydrophobic interaction Critical micelle concentration Thermodynamic properties

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Parity effects in Rydberg-state excitation in intense laser fields

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Photonics research 2024年第12期12卷 3033-3039页

作者： YANG LIU XIAOPENG YI QI CHEN TIAN SUN HANG LV SHILIN HU WILHELM BECKER HAIFENG XU JING CHEN Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Institute of Applied Physics and Computational Mathematics Beijing 100088China Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou UniversityShantou 515063China Max-Born-Institut 12489 BerlinGermany Hefei National Laboratory Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

Conservation of parity plays a fundamental role in our understanding of various quantum ***,it is difficult to observe in atomic and molecular processes induced by a strong laser field due to their multiphoton character and the large number of states *** we report an effect of parity in strong-field Rydberg-state excitation(RSE)by comparing the RSE probabilities of the N_(2) molecule and its companion atom Ar,which has a similar ionization potential but opposite parity of its ground ***,we observe an oscillatory structure as a function of intensity with a period of about 50 TW∕cm^(2) in the ratio between the RSE yields of the two species,which can be reproduced by simulations using the time-dependent Schrödinger equation(TDSE).We analyze a quantum-mechanical model,which allows for interference of electrons captured in different spatial regions of the Rydberg-state wave *** the intensity-dependent RSE yield,it results in peaks with alternating heights with a spacing of 25 TW∕cm^(2) and at the same intensity for both ***,due to the opposite parities of their ground states,pronounced RSE peaks in Ar correspond to less pronounced peaks in N_(2) and vice versa,which leads to the period of 50 TW∕cm^(2) in their *** work reveals a novel parity-related interference effect in the coherent-capture picture of the RSE process in intense laser fields.

关键词： function parity Rydberg

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High-throughput investigations of configurational-transformation-dominated serrations in CuZr/Cu nanolaminates

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Journal of Materials science & technology 2020年第18期52卷 192-199页

作者： William Yi Wang Bin Gana Deye Lin Jun Wang Yiguang Wang Bin Tang Hongchao Kou Shunli Shang Yi Wang Xingyu Gao Haifeng Song Xidong Hui Laszlo J.Kecskes Zhenhai Xia Karin A.Dahmen Peter K.Liaw Jinshan Lia Zi-Kui Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an.710072China Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing100081China IMDEA Materials Institute Calle Eric Kandel 2GetafeMadrid28906Spain CAEP Software Center for High Performance Numerical Simulation Institute of Applied Physics and Computational MathematicsBeijing100088China Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Hopkins Extreme Materials Institute Johns Hopkins UniversityBaltimoreMD21218USA Department of Physics University of Illinois at Urbana ChampaignUrbanaIL61801USA Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996USA

Metallic amorphous/crystalline(A/C)nanolaminates exhibit excellent ductility while retaining their high ***,the underlying physical mechanisms and the resultant structural changes during plastic deformation still remain *** the present work,the structure-property relationship of CuZr/Cu A/C nanolaminates is established through integrated high-throughput micro-compression tests and molecular dynamics simulations together with high-resolution transmission electron *** serrated flow of nanolaminates results from the formation of hexagonal-close-packed(HCP)-type stacking faults and twins inside the face-centered-cubic(FCC)Cu nano-grains,the body-centered-cubic(BCC)-type ordering at their grain boundaries,and the crystallization of the amorphous CuZr *** serration behavior of CuZr/Cu A/C nanolaminates is determined by several factors,including the formation of dense dislocation networks from the multiplication of initial dislocations that formed after yielding,weak-spots-related configurational-transitions and shear-transition-zone activities,and deformation-induced *** present work provides an insight into the heterogeneous deformation mechanism of A/C nanolaminates at the atomic scale,and mechanistic base for the microstructural design of self-toughening metallic-glass(MG)-based composites and A/C nanolaminates.

关键词： Nanolaminates Serration Configurational transformation Molecular dynamics Metallic glass

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High payload adaptive audio watermarking based on cepstral feature modification

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Journal of Information Hiding and Multimedia Signal Processing 2014年第4期5卷 586-602页

作者： Dhavale, Sunita V. Deodhar, Rajendra S. Pradhan, Debasish Patnaik, L.M. Department of Computer Science and Engineering Defence Institute of Advanced Technology Girinagar Pune411025 India Armament Research and Development Establishmen Pashan Pune411021 India Department of Applied Mathematics Defence Institute of Advanced Technology Girinagar Pune411025 India Department of Computer Science and Automation Indian Institute of Science Bangalore560012 India

In this paper, we propose two blind adaptive audio watermarking schemes based on complex cepstrum transform (CCT) domain features. In first scheme (Scheme- I), each audio segment is divided into two subsets having approximately same statistical mean value using down-sampling method. Since the human auditory system (HAS) is not much sensitive to the minute change of the wavelet high-frequency components, first level discrete wavelet transform (DWT) detail coeficients subbands of both subsets are used for embedding. Watermark is embedded by changing slightly the difierence between the mean values (Mdiff) of insignificant CCT coeficients of these subsets in order to guar antee minimal perceptual distortion. The ofiset value by which mean is modified is made adaptive to the local energies of the audio frames in order to increase the audio quality further. In order to enhance the payload capacity, we propose an alternate audio wa- termarking scheme (Scheme-II) where watermark is embedded by deciding the transition of Mdiff value from one frame to another frame in two successive frames. In contrast to previous works, instead of embedding one bit per frame, Scheme-II can embed three bits per two frames. Thus 33.33% increase in embedding capacity is achieved. As ampli- tude scaling in time domain does not afiect selected insignificant CCT coeficients, strong invariance towards amplitude scaling attacks is also proved theoretically. Experimental results reveal that the proposed watermarking schemes maintain high audio quality and are simultaneously robust to general attacks like MP3 compression, amplitude scaling, filtering, re-sampling, re-quantization etc. © 2014.

关键词： Discrete wavelet transforms

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