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On the Monotonicity of the Speed of Random Walks on a Percolation Cluster of Trees

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Acta Mathematica Sinica,English Series 2007年第11期23卷 1949-1954页

作者： Da yue CHEN fu Xi ZHANG LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China

The authors consider the simple random walk on the infinite cluster of the Bernoulli bond percolation of trees, and investigate the relation between the speed of the simple random walk and the retaining probability p ... 详细信息

关键词： random walk percolation speed monotonicity tree

Performance of water-based foams affected by chemical inhibitors to retard spontaneous combustion of coal

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International Journal of Mining Science and Technology 2016年第3期26卷 443-448页

作者： Chen Peng Huang fujun fu yue School of Resource and Safety Engineering China University of Mining & Technology

The micelle generating process of the sodium dodecyl sulfate(SDS) solution with the addition of chemical inhibitors was elucidated using phase separation model, and the descending order of the capacity for the selected chemical inhibitors to reduce the critical micelle concentrations of the solution are Mg Cl_2, Ca Cl_2,NH_4HCO_3 and NH_4Cl. The data to quantitatively describe the foam decay process, including foaming ratio,foam life and decay behaviors, was obtained by pressure measuring system. The results indicate that chemical inhibitors can improve the solution foamability. The capacity of the inhibitors to enhance the solution foamability is sorted as NH_4 Cl, NH_4HCO_3, Mg Cl2 and Ca Cl_2 which can distinctly improve the foam stability as well. The capacity of the inhibitors to enhance the SDS foam stability can be arranged as Mg Cl_2, NH_4 Cl, NH_4HCO_3 and Ca Cl_2. It is observed that the gravity drainage plays a leading role in the increase of proportion of diffusion drainage. The oxidation dynamic parameters of the coal samples treated by inhibition foams were investigated using thermal analysis technique, and their synergistic effects on inhibiting coal oxidation were explored.

关键词： Coal spontaneous combustion Chemical inhibitors Micelle thermal power Foam performance Activation energy

Optimization of cold-end system of thermal power plants based on entropy generation minimization

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Frontiers in Energy 2022年第6期16卷 956-972页

作者： yue fu Yongliang ZHAO Ming LIU Jinshi WANG Junjie YAN State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Cold-end systems are heat sinks of thermal power cycles,which have an essential effect on the overall performance of thermal power *** enhance the efficiency of thermal power plants,multi-pressure condensers have been applied in some large-capacity thermal power ***,little attention has been paid to the optimization of the cold-end system with multi-pressure condensers which have multiple parameters to be ***,the design optimization methods of coldend systems with single-and multi-pressure condensers are developed based on the entropy generation rate,and the genetic algorithm(GA)is used to optimize multiple *** parameters,including heat transfer area of multi-pressure condensers,steam distribution in condensers,and cooling water mass flow rate,are optimized while considering detailed entropy generation rate of the cold-end *** results show that the entropy generation rate of the multi-pressure cold-end system is less than that of the single-pressure cold-end system when the total condenser area is ***,the economic performance can be improved with the adoption of the multi-pressure cold-end *** compared with the single-pressure cold-end system,the excess revenues gained by using dual-and quadruplepressure cold-end systems are 575 and 580 k$/a,respectively.

关键词： cold-end system entropy generation minimization optimization economic analysis genetic algorithm(GA)

Microstructures and properties of 6016 aluminum alloy with gradient composition

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Rare Metals 2021年第8期40卷 2154-2159页

作者： Xiang-Jie Wang Wei Sun Jun-fu Chen fu-yue Wang Lei Li Jian-Zhong Cui Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China

Weight reduction plays an important role in reducing fuel and emissions,and the heat-treatable 6016 aluminum alloy exhibits excellent application prospect in automobile *** this paper,ingot with constant Mg/Si ratio and decreased Mg and Si contents was *** the microstructure and the texture of 6016 aluminum alloy plate designed with different alloy compositions at the top/bottom were systematically investigated by electron backscatter diffraction technology(EBSD)measurement,as well as the room-temperature mechanical properties at the different positions with composition *** results indicate that as Mg and Si contents increase,the grain size decreases,improving the cube texture with recrystallization and weakening the S *** strength of 6016 aluminum alloy decreases with lower Mg and Si contents.

关键词： 6016 Aluminum alloy plate Mg and Si contents Mechanical properties

Low Frequency Electromagnetic Casting of 2195 Aluminum-Lithium Alloy and Its Effects on Microstructure and Mechanical Properties

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Acta Metallurgica Sinica(English Letters) 2020年第3期33卷 338-350页

作者： fu-yue Wang Xiang-Jie Wang Wei Sun Fang Yu Jian-Zhong Cui Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

In this study,the low frequency electromagnetic casting(LFEC) technology was adopted to fabricate 2195 Al-Li *** microstructure and solid solubility of as-cast 2195 alloys,as well as the second phase precipitation and tensile properties after aging,were investiagated and compared with the counterpart direct chill casting 2195 *** results indicate that LFEC can significantly improve the microstructure and metallurgical quality of as-cast alloy,and increase the number density of θ’(Al2Cu) and T1(Al2CuLi) phases during aging treatment due to the enhanced solubilities of alloying *** tensile properties of 2195 aged alloy cast by LFEC were hence improved evidently.

关键词： LFEC(low frequency electromagnetic casting) 2195 Aluminum-lithium alloy Casting defects Microstructure Tensile property

Dialect Diversity and Foreign Direct Investment in China

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China & World Economy 2021年第2期29卷 49-72页

作者： Wei Feng Yanrui Wu yue fu School of Economics and Management Southeast UniversityChina Business School University of Western AustraliaAustralia School of Economics and Management Shanghai University of Political Science and LawChina

This paper examines the relationship between dialect diversity and foreign direct investment(FDI)using a dataset of 230 Chinese cities for the period *** find that dialect diversity and FDI absorption are negatively ***,this negative relationship disappears gradually over *** underlying mechanisms are *** particular,it is found that dialect diversity impedes human capital development and hence obstructs FDI *** results also show that there are threshold and spatial spillover *** research increases knowledge of FDI location choice and has implications for foreign investment policymaking.

关键词： dialect diversity economic growth FDI absorption human capital

Vitreous substitutes: challenges and directions

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International Journal of Ophthalmology(English edition) 2015年第3期8卷 437-440页

作者： Qian-Ying Gao yue fu Yan-Nian Hui State Key Laboratory of Ophthalmology Zhongshan Ophthalmic Center Sun Yat-sen University Department of Ophthalmology Xijing Hospital the Fourth Military Medical University

The natural vitreous body has a fine structure and complex functions. The imitation of the natural vitreous body by vitreous substitutes is a challenging work for both researchers and ophthalmologists. Gases, silicone oil, heavy silicone oil and hydrogels, particularly the former two vitreous substitutes are clinically widely used with certain complications. Those, however, are not real artificial vitreous due to lack of structure and function like the natural vitreous body. This article reviews the situations, challenges, and future directions in the development of vitreous substitutes, particularly the experimental and clinical use of a new artificial foldable capsular vitreous body.

关键词： vitreous substitute artificial vitreous foldable capsular vitreous body silicone oil

4d金属掺杂MoS_(2)改善对NO_(2)传感性能的机理研究

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原子与分子物理学报 2025年第2期42卷 175-181页

作者：潘一翠罗磊高鑫付岳牟芷瑶朱洪强冯庆重庆师范大学物理与电子工程学院重庆401331 重庆市光电功能材料重点实验室重庆401331

二硫化钼(MoS_(2))是一种热门的气体传感器材料.针对MoS_(2)与气体分子之间的弱相互作用问题,掺杂是一种有效的解决方式.本文利用基于密度泛函理论(DFT)的第一性原理平面波超软赝势计算方法,对二氧化氮(NO_(2))分子在4d金属掺杂后的MoS_... 详细信息

二硫化钼(MoS_(2))是一种热门的气体传感器材料.针对MoS_(2)与气体分子之间的弱相互作用问题,掺杂是一种有效的解决方式.本文利用基于密度泛函理论(DFT)的第一性原理平面波超软赝势计算方法,对二氧化氮(NO_(2))分子在4d金属掺杂后的MoS_(2)表面上吸附的微观机制进行了理论研究.研究结果表明:4d过渡金属元素掺杂有利于提高MoS_(2)吸附NO_(2)后的稳定性,且掺杂改变了材料表面的还原性,改善了其传感性能.掺入4d金属原子的材料禁带宽度显著减小,并且在费米能级附近形成了新的杂质峰,这大大提升了它的导电性.且掺杂原子的4d与5s轨道电子之间的协同作用会提升气体分子与材料之间的传感特性,这表明4d金属原子掺入MoS_(2)可以成为一种有效的NO_(2)传感器材料.本文的工作有助于寻求合适的化学掺杂的方法来提高MoS_(2)基气体传感器的性能.

关键词： MoS_(2) NO_(2) 吸附掺杂第一性原理计算

Silicone Elastomer with High Elongation at Break Used in Digital Light Processing 3D Printing

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Chinese Journal of Polymer Science 2023年第11期41卷 1786-1795,I0010页

作者： Tian-Xin Yu Ya-Yuan Liu fu-yue Tian Nan-Ying Ning Bing Yu Ming Tian State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Carbon Fiber and functional Polymers Ministry of EducationBeijing University of Chemical TechnologyBeijing 100029China

3D printing silicone elastomer has demonstrated great potential in diverse areas such as medical devices,flexible electronics and soft *** is of great value to investigate how to improve the mechanical properties,including tensile strength and elongation at break of printed *** this work,a light curing system that can be applied in silicone elastomer 3D printing is explored,which is composed of vinyl terminated polysiloxane as the macromer and thiol containing polysiloxane as the crosslinking agent,and a chain extension reaction is also introduced into this light curing system via the addition of the chain extender dithiol molecules,and a light curing system accompanied with chain extension is designed and realized based on the thiol-ene click reaction *** reinforced with silica fillers,the obtained light curing system can endow the light curing silicone elastomer with better mechanical properties under the condition of a lower viscosity of the precursor,the tensile strength and elongation at break can reach 525.5 k Pa and 601%,*** light curing system provides a feasible method to solve the contradiction between the viscosity of the precursor and the mechanical properties of the light curing elastomer in the digital light processing(DLP)3D printing field.

关键词： Silicone elastomer Thiol-ene click chemistry Light curing 3D-printing Chain extender