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Effect of densification distribution on the Young's modulus of porous coatings after nano-indentation

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Acta Metal.urgica Sinica(English letters) 2012年第5期25卷 383-390页

作者： Xiaojuan l.u Ping XIAO Haiyan lI School of Environment Science and Engineering North China Electric Power University Yonghua North Street Baoding 071000 China School of Materials The University of Manchester Manchester M1 7HS UK School of Mechanical Aerospace and Civil Engineering The University of Manchester P.O. Box 88Sackville Street Manchester M60 1QD UK

Nano-indentation of a porous ceramic coating leads to crushing and densification of the coating under the indenter. In this work, finite element simulations of indentation on the porous coating have been carried out to study the effect of the size and dis- tribution of densification on Youngts modulus measured by nano-indentation. Two totally different distribution patterns have been simulated in this work. In the case of gradient densification, the Youngts modulus increased by 8.6% when the densifi- cation has occurred in the maximum influenced area. While the Young^s modulus increased by 2% with a uniformed densification. Examinations of the cross-section of the coatings have suggested that the densification after the indentation is close to the second model. The measured Young＇s modulus could have differed by 2%. The effect of densification on the Young＇s modulus measured by using nano-indentation is strongly dependent on the densification patterns of the porous coating.

关键词： Film Mechanical property Finite element simulation Porosity Electron Microscopy

Dynamic analysis of a flameless combustion model combustor

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Science China(Technological Sciences) 2010年第8期53卷 2291-2298页

作者： CuI YuFeng lüXuan Xu gang NIE ChaoQun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China Graduate School of the Chinese Academy of Sciences Beijing 100190China

Flameless combustion is a new technology with the following advantages:1)ultra-low emissions of both NOX and CO;2)fuel flexibility,from liquid fuels,natural gas to hydrogen-rich syngas;3)lower possibility of flashback and thermoacoustic *** this paper,we focus on the dynamic characteristics of a flameless model *** results show that flameless combustion can lower emissions while maintaining combustion ***,combining a pilot flame with flameless combustion may excite thermoacoustic instability.

关键词： flameless combustion thermoacoustic oscillations dynamic pressure characteristics gas turbine

Glass-forming ability, phase formation and mechanical properties of glass-forming Cu-Hf-Zr alloys

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Progress in Natural Science:Materials International 2019年第5期29卷 576-581页

作者： K.Kosiba Kaikai Song u.Kühn gang Wang S.Pauly leibniz IFW Dresden Institute for Complex Materials School of Mechanical Electrical & Information Engineering Shandong University (Weihai) laboratory for Microstructures Institute of Materials Shanghai University

The influence of Hf additions on the glass-forming ability（GFA）,phase formation and mechanical properties of Cu;Hf;Zr;（x=2,5,10,20 at.%）alloys has been systematically *** report on a distinct correlation between phase formation and GFA of Cu;Zr;-based *** additions of Hf reduce the thermal stability of the high-temperature B2Cu（Hf,Zr）phase,while the thermal stability of the corresponding undercooled melt is *** GFA of these alloy series gradually raises up to 10 at.%Hf,whereas at 20 at.%Hf,the GFA is drastically lowered,since the B2Cu（Hf,Zr）phase becomes unstable and the precipitation of the lowtemperature equilibrium phases is *** interrelation determines the microstructure and results in the formation of Cu-Hf-Zr-based bulk metallic glass *** composites not only show appreciable macroscopic plastic strain,but also high yield strength.

关键词： Metallic glasses Glass-forming ability Composites Continuous cooling transformation (CCT) diagram Mechanical properties

Variational data encoding and correlations in quantum-enhanced machine learning

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Chinese Physics B 2024年第9期33卷 298-306页

作者： Ming-Hao Wang Hua l.u School of Physics Hubei UniversityWuhan 430062China School of Science Hubei University of TechnologyWuhan 430068China

leveraging the extraordinary phenomena of quantum superposition and quantum correlation,quantum computing offers unprecedented potential for addressing challenges beyond the reach of classical *** paper tackles two pivotal challenges in the realm of quantum computing:firstly,the development of an effective encoding protocol for translating classical data into quantum states,a critical step for any quantum *** encoding strategies can significantly influence quantum computer ***,we address the need to counteract the inevitable noise that can hinder quantum *** primary contribution is the introduction of a novel variational data encoding method,grounded in quantum regression algorithm *** adapting the learning concept from machine learning,we render data encoding a learnable *** allowed us to study the role of quantum correlation in data *** numerical simulations of various regression tasks,we demonstrate the efficacy of our variational data encoding,particularly post-learning from instructional ***,we delve into the role of quantum correlation in enhancing task performance,especially in noisy *** findings underscore the critical role of quantum correlation in not only bolstering performance but also in mitigating noise interference,thus advancing the frontier of quantum computing.

关键词： quantum machine learning variational data encoding quantum correlation

Effects of slag fineness on durability of mortars

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Journal of Zhejiang university-Science A(Applied Physics & Engineering) 2007年第11期8卷 1725-1730页

作者： TOPu lker Bekir BlR Turhan Department of Civil Engineering Eski■ehir Osmangazi university Eski■ehir 26480 Turkey

In recent years, the usages of by-products and wastes in industry have become more important. The importance of the sustainable development is also of increasing. The utilizations of wastes, as mineral admixture or fine aggregate, reduce the consumption of the natural resources and improve the durability of concrete. In this study, the effect of the fineness on the high temperature and sulphate resistances of concrete mortar specimens, produced with ground granulated blast-furnace slag (GBFS) replacing cement, is investigated. The compressive and flexural strength test results for all series related to durability effects, exposing temperature and solutions, exposure times for these durability effects, slag content and fineness are discussed. Conse- quently, the optimum slag contents are determined for producing the sulphate and high temperature resistant mortars.

关键词： Cement Fineness Ground slag High temperature effect Sulphate attack Sustainable development

Synchronization dynamics of phase oscillators with generic adaptive coupling

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Communications in Theoretical Physics 2023年第4期75卷 114-122页

作者： Xin Jin Yong-gang Wu Hua-Ping lü Can Xu School of Physics and Electronic Engineering Jiangsu Normal UniversityXuzhou 221116China School of Mathematical Sciences Huaqiao UniversityQuanzhou 362021China Institute of Systems Science and College of Information Science and Engineering Huaqiao UniversityXiamen 361021China

Adaptive coupling schemes among interacting elements are ubiquitous in real systems ranging from physics and chemistry to neuroscience and have attracted much attention in recent ***,we extend the Kuramoto model by considering a particular adaptive scheme in a system of globally coupled *** homogeneous coupling is correlated with the global coherence of the population that is weighted by the generic nonlinear feedback function of the amplitude of the order *** studied model is analytically tractable that generalizes the theory of Kuramoto for synchronization *** develop a mean-field theory by establishing the self-consistent equation describing the stationary dynamics in the thermodynamic ***,the landau damping effect,which turns out to be far more generic,is revealed in the framework of the linear stability analysis of the resonant pole ***,the relaxation rate of the order parameter in the subcritical region is obtained from a universal *** study can deepen the understanding of synchronization transitions and other related collective dynamics in networked oscillators with adaptive interaction schemes.

关键词： synchronization complex system coupled oscillators phase transition

Effects of process parameters on the growth behavior and granule size distribution of iron ore mixtures in a novel high-shear granulator

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International Journal of Minerals,Metal.urgy and Materials 2022年第12期29卷 2152-2161页

作者： Yang You Jiabao Guo gang li Zhuang Zheng Yong li Xuewei lü College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key laboratory of Vanadium–Titanium Metal.urgy and New Materials Chongqing UniversityChongqing 400044China

This work proposes a novel horizontal high-shear granulator for iron ore granulation before sintering *** granulation behavior such as growth process and structure of granules were firstly analyzed,followed by the effects of operation conditions such as water content,initial particle size distribution,and the concentrate *** results show that the granule size increased significantly with increasing the granulation time,and the structure of granule can be divided into three types:non-nuclei,single-nuclei,and *** promotes the coalescence and growth of particles,and a better granulation performance was obtained at the water content of 8.8wt%under the current raw material *** the nuclei particle ratio led to an increase in average size of granules and permeability of the granules bed,but a decrease in growth ***,with increasing of concentrate ratio,granulation performance such as granule size,bed permeability,and uniformity became worse.

关键词： horizontal high-shear granulation iron ore granule structure granulation performance size distribution

Simulation of rainfall-runoff and watershed convergence process in the upper reaches of Heihe River Basin,July 2002

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Science China Earth Sciences 2004年第Z1期47卷 1-8页

作者： GAO Yanhong l.u) Shihua CHENG Guodong Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China

The watershed flow concentration scheme in the distributed hydrology-soil- vegetation model (DHSVM) is coupled with the mesoscale atmospheric model MM5 version 3.5, in which the Oregen States university land surface model (OSulSM) was involved. The flood event which happened in July 2002 in the upper reaches of Heihe river basin is simulated and the surface flow convergence process is shown with this coupled model. It has been concluded that times water head reaches each place of the basin are different. Water amount at each point is split-flow proportionally as the drops in elevation between it and neighbor points. large part of the water amount pass away in greater slope direction and small part pass away in smaller slope *** of the slope convergence makes the atmospheric model redistributes the surface water laterally.

关键词： distributed hydrology-soil-vegetation model, mesoscale atmospheric model, watershed flow concentration process.

A Cl.ud Computing Security Model Based on Noninterference

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Wuhan university Journal of Natural Sciences 2019年第3期24卷 194-200页

作者： lü Congdong QIAN gang CHEN Tao School of Information Engineering Nanjing Audit University People's Court Judicial Big Data Research Base Southeast University

In cl.ud computing, the risk of data leakage exists between users and virtual machines. Whether it is direct or indirect data leakage, it can be regarded as illegal information flow. Methods such as access control models can control the information flow rather than the covert information flow. Therefore, it needs to use the noninterference models to detect the existence of illegal information flow in cl.ud computing. Typical noninterference models are not suitable to verificate information flow in cl.ud computing. When concurrent access actions execute in the cl.ud architecture, security domains do not affect each other, because there is no information flow between security domains. Based on this, we propose noninterference for cl.ud architecture in which concurrent access and sequential access coexist. When the sequential actions execute, the information flow between security domains can flow in accordance with established rules. When concurrent access actions execute, there should not be the information flow between security domains.

关键词： cl.ud computing security information flow security noninterference noninterference models