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Effect of Progressive Substitution of Cement and Lime by Powdered Shells Used as a Curing Agent for Dredged Soil in a Port Area

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 88-102页

作者： sun yang WANG Faxin SU Yaying LI Yiwei HE Feng College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Huai'an Research Institute Hohai UniversityHuai'an 223025China Jiangsu Fangyang Industrial Investment Corp.Ltd. Lianyungang 210098China

This study aimed to address the challenges of solid waste utilization,cost reduction,and carbon reduction in the treatment of deep-dredged soil at Xuwei Port in Lianyungang city of *** research in this area was ***,a curing agent made from powdered shells was used to solidify the dredged soil in *** employed laboratory orthogonal tests to investigate the physical and mechanical properties of the powdered shell-based curing *** was collected by conducting experiments to assess the role of powdered shells in the curing process and to determine the optimal ratios of powdered shells to solidified soil for different *** development of strength in solidified soil was studied in both seawater and pure water *** study revealed that the strength of the solidified soil was influenced by the substitution rate of powdered shells and their interaction with *** cement content had a positive effect on *** high-strength solidified soil,the recommended ratio of wet soil:cement:lime:powdered shells were 100:16:4:4,while for low-strength solidified soil,the recommended ratio was 100:5.4:2.4:***,under appropriate conditions,improved short-term strength by promoting the formation of expansive ettringite minerals that contributed to cementation and *** findings suggest that the combination of cement and powdered shells is synergistic,positively affecting the strength of solidified *** recommended ratios provide practical guidance for achieving desired strength levels while considering factors such as cost and carbon *** role of seawater in enhancing short-term strength through crystal formation is noteworthy and can be advantageous for certain *** conclusion,this research demonstrates the potential of using a powdered shell-based curing agent for solidifying dredged soil in an environmentally friendly and cost-effective *** recommended ratios for different str

关键词： carbon reduction and solidification dredged soil abandoned shells orthogonal test chemical additives(lime and cement) unconfined compressive strength(UCS)

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Robust Calibration of Computer Models Based on Huber Loss

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Journal of Systems Science & Complexity 2023年第4期36卷 1717-1737页

作者： sun yang FANG Xiangzhong School of Mathematical Sciences Peking UniversityBeijing 100871China

Recently,uncertainty quantification is getting more and more attention,especially for computer model ***,most of the existing papers assume the errors follow a Gaussian or sub-Gaussian distribution,which would not be satisfied in *** overcome the limitation of the traditional calibration procedures,the authors develop a robust calibration procedure based on Huber loss,which can deal with responses with outliers and heavy-tail errors *** authors propose two different estimators of the calibration parameters based on ordinary least estimator and L_(2)calibration respectively,and investigate the nonasymptotic and asymptotic properties of the proposed estimators under certain *** numerical simulations and a real example are conducted,which verifies good performance of the proposed calibration procedure.

关键词： Heavy-tailed error M-estimation outliers robustness uncertainty quantification

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Numerical investigation of transcritical liquid film cooling in a methane/oxygen rocket engine

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航空动力学报 2011年第4期26卷 903-916页

作者： yang Wei sun Bing School of Astronautics Beijing University of Aeronautics and Astronautic Beijing 100191 China

Transcritical film cooling was investigated by numerical study in a methane cooled methane/oxygen rocket *** respective time-averaged Navier-Stokes equations have been solved for the compressible steady three-dimensional(3-D) *** flow field computations were performed using the semi-implicit method for pressure linked equation(SIMPLE) algorithm on several blocks of nonuniform collocated *** calculation was conducted over a pressure range of 202 650.0 Pa to 1.2×107 Pa and a temperature range of 120.0 K to 3 568.0 ***-nine different cases were simulated to calculate the impact of different *** results show that mass flow rate,length,diameter,number and diffused or convergence of film jet channel,injection angle and jet array arrangements have great impact on transcritical film cooling ***,shape of the jet holes and jet and crossflow turbulence also affect the wall temperature *** rows of film arranged in different axial angles and staggered arrangement were proposed as new liquid film *** radial angles have impact on the film cooling effectiveness in two row-jets cooled *** case of in-line and staggered arrangement are almost the same in the region before the second row of jets,but a staggered arrangement has a higher film cooling effectiveness from the second row of jets.

关键词： liquid film cooling numerical study rocket transcritical semi-implicit method for pressure linked equation(SIMPLE) film cooling effectiveness

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EDGE-ORIENTED HEXAGONAL ELEMENTS

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Journal of Computational Mathematics 2007年第4期25卷 430-439页

作者： Chao yang Jiachang sun Parallel Computing Lab. Institute of Software Chinese Academy of Sciences Beijing 100080 China

In this paper, two new nonconforming hexagonal elements are presented, which are based on the trilinear function space Q1^（3） and are edge-oriented, analogical to the case of the rotated Q1 quadrilateral element. A priori error estimates are given to show that the new elements achieve first-order accuracy in the energy norm and second-order accuracy in the L^2 norm. This theoretical result is confirmed by the numerical tests.

关键词： Nonconforming finite element method Hexagonal element Q1 element.

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Electrochemical synthesis of FeN_(x) doped carbon quantum dots for sensitive detection of Cu^(2+) ion

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Green Energy & Environment 2023年第1期8卷 141-150页

作者： Siyuan sun Weijie Bao Fan yang Xingru Yan yang sun Ge Zhang Wang yang Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of PetroleumChangpingBeijing102249China

A novel strategy was developed to fabricate FeNx-doped carbon quantum dots(Fe-N-CQDs)to detect Cu^(2+) ions selectively as a fluorescence *** Fe-N-CQDs were synthesized by an efficient electrolysis of a carbon cloth electrode,which was coated with monoatomic ironanchored nitrogen-doped carbon(Fe-N-C).The obtained Fe-N-CQDs emitted blue fluorescence and possessed a quantum yield(QY)of 7.5%.An extremely wide linear relationship between the Cu^(2+) concentration and the fluorescence intensity was obtained in the range from 100 nmol L^(-1) to 1000 nmol L^(-1)(R^(2)=0.997),and the detection limit was calculated as 59 nmol L^(-1).Moreover,the Fe-N-CQDs demonstrated wide range pH compatibility between 2 and 13 due to the coordination between pyridine nitrogen and Fe^(3+),which dramatically reduced the affection of the protonation and deprotonation process between H^(+) and *** is notable that the Fe-N-CQDs exhibited a rapid response in Cu^(2+) detection,where stable quenching can be completed in 7 *** mechanism of excellent selective detection of Cu^(2+) was revealed by energy level simulation that the LUMO level of Fe-N-CQDs(-4.37 eV)was close to the redox potential of Cu^(2+),thus facilitating the electron transport from Fe-N-CQDs to Cu^(2+).

关键词： Electrolysis FeNx-doped CQDs Cu2t detection pH compatibility Quick response

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Superconductivity and superfluidity as universal emergent phenomena

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Frontiers of physics 2015年第4期10卷 67-72页

作者： Mike Guidry yang sun Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China IFSA Collaborative Innovation Center Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

Superconductivity （SC） or superfluidity （SF） is observed across a remarkably broad range of fermionic systems： in BCS, cuprate, iron-based, organic, and heavy-fermion superconductors, and in superfiuid helium-3 in condensed matter; in a variety of SC/SF phenomena in low-energy nuclear physics; in ultracold, trapped atomic gases; and in various exotic possibilities in neutron stars. The range of physical conditions and differences in microscopic physics defy all attempts to unify this behavior in any conventional picture. Here we propose a unification through the shared symmetry properties of the emergent condensed states, with microscopic differences absorbed into parameters. This, in turn, forces a rethinking of specific occurrences of SC/SF such as high-To SC in cuprates, which becomes far less mysterious when seen as part of a continuum of behavior shared by a variety of other systems.

关键词： superconductivity superfluidity

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Active disturbance rejection control on first-order plant

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Journal of Systems Engineering and Electronics 2011年第1期22卷 95-102页

作者： Ruiguang yang Mingwei sun Zengqiang Chen College of Information Technical Science Nankai University Tianjin 300071 P. R. China

Conventional PI control encounters some problems when dealing with large lag process in the presence of parameter *** the typical first-order process,an observerbased linear active disturbance rejection control（LADRC） scheme is presented to cope with the difficulties,and a reduced-order observer scheme is proposed *** quantitative dynamic results with regard to non-overshoot characteristics are ***,the performance boundaries of LADRC and PI control are explicitly compared with each other,which shows that the former is more superior in most cases.

关键词： active disturbance rejection control(ADRC) first-order process dynamic performance non-overshoot.

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Energy Absorption of Spider Orb Webs During Prey Capture： A Mechanical Analysis

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Journal of Bionic Engineering 2015年第3期12卷 453-463页

作者： Hui Yu Jialing yang Yuxin sun Institute of Solid Mechanics Beihang University Beijing 100191 China

When the spider orb web stops a prey, the web dissipates impact energy by three routes： internal dissipation within the radial silk, internal dissipation within the spiral silk and aerodynamic dissipation. This paper investigates the energy dissipation mechanism of spider orb webs from the mechanics point of view. Firstly, the dynamic response and energy dissipation of a single spider silk under transverse impact are studied analytically and numerically. The congruence of dynamic response curve validates the accuracy of finite element analysis. Then the whole web is modeled using the finite element method and the respective contribution of each route to total energy dissipation during the simulated prey impact is obtained, which agrees with published experimental results. Finally, the influence of initial impact kinetic energy on the fraction distribution of three routes is demonstrated based on the finite element model. The mechanical mechanism of energy dissipation of spider orb webs is discussed and the reason for the differences among the existing opinions is speculated.

关键词： silk spider webs energy dissipation finite element

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On the structure of isomeric state in neutron-rich 108Zr: A projected shell model analysis

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 92-98页

作者： LIU YanXin YU ShaoYing sun yang School of Science Huzhou University Department of Physics and Astronomy Shanghai Jiao Tong University IFSA Collaborative Innovation Center Shanghai Jiao Tong University State Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences

Inspired by the recent experimental identification of the new isomer with a half-life of （620±150） ns in the very neutron-rich nucleus 180SZr, we apply the projected shell model with axially-deformed bases to discuss possible shapes near the ground state and the nature of the isomer. The structure of the new isomer is investigated by restricting the calculation to prolate and oblate shapes. It is shown that the isomer can be understood as a K-isomer. Meanwhile, the calculation predicts more low-lying high-K configurations, which may be confirmed by future experiments,

关键词： K isomer shape isomer prolate shape oblate shape projected shell model

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Estimation of carbon dioxide flux and source partitioning over Beijing, China

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Journal of Environmental Sciences 2013年第12期25卷 2429-2434页

作者： Tao Song Yuesi Wang yang sun State key laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences

The magnitude and partitioning of carbon dioxide emission from the urban area in Beijing, China was estimated based on a statistical approach. Results showed that the urban surface is a net source of CO2 to atmosphere. The main sources of CO2 are vehicles, which accounted for 75.5% and 38.9% of CO2 emission in summer and winter, respectively. At midday in summer, the CO2 uptake of-0.034 mg/（m^***） indicated that vegetation is an important sink of CO2 in summer. Comparison between the annual emission rates of CO2 from the statistical approach and that directly measured by the eddy covariance technique implies that a bottom-up emission approach is a viable means to estimate CO2 emission in an urban area.

关键词： C02 emission source eddy covariance

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