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Journal of Hydrodynamics 2012年第3期24卷 332-338页

作者： LI Wei LI Xiao-ping LI Shun-chu LI Quan-yong State Key Lab.ratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500 China Institute of Applied Mathematics Xihua University Chengdu 610039 China

When the classical nonlinear partial differential equations are used to model the fractal reservoir, b.sed on the assumption of low compressib.lity fluids, the effects of the quadratic gradient term are ignored, which would b. questionab.e for mixed gas reservoirs and low permeab.lity reservoirs. To consider the influence of the wellb.re storage, the nonlinear mathematical flow model of the fractal multilayer reservoir is b.ilt in this paper, with three kinds of outer b.undaries （infinite b.undaries, constant pressure b.undaries and closed b.undaries）. Using the Laplace transform method, the solutions for the dimensionless reservoir pressure and the b.ttom hole pressure in the Laplace space are ob.ained. An analysis shows that the solutions involve similar structures even for three different kinds of outer b.undaries, and can b. unified as a continuous fraction. The unified expression would make it more convenient to analyze the formation parameters, which greatly facilitates the development of the well test analysis software.

关键词： fractal multilayer reservoir quadratic gradient wellb.re storage similar structure

Mechanism,Kinetics,and Thermodynamic Characteristics for the Demetallization of Used Lub.icating Oil via Pyrolysis

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China Petroleum Processing & Petrochemical Technology 2023年第2期25卷 113-127页

作者： Yang Haiyu Jiang Zhenxin chu Qingyan Jiang Peng Wang Ming School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255049China Shandong Qinghe Chemical Technology Co. LtdZibo 256405China School of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

This study analyzed the pyrolysis mechanism,developed a pyrolysis kinetic model,and determined the corresponding thermodynamic parameters for the removal of calcium from used lub.icating oil using sulfurized calcium alkyl phenolate(T-115b.as a model *** pyrolysis process and products were evaluated b. Fourier transform infrared spectroscopy and X-ray photoelectron *** inspection indicated that the removal of calcium from T-115b.depended primarily on the destruction of micelles caused b. the pyrolysis of compounds at high *** pyrolysis characteristics of T-115b.at different heating rates were investigated b. thermogravimetry and differential thermal analysis,which revealed two distinct pyrolysis ***,the pyrolysis mechanism can b. describ.d b. a twostep *** activation energy and thermodynamic parameters(ΔH,ΔG,andΔS)were determined b. applying the Kissinger-Akahira-Sunose,Flynn-Wall-Ozawa,Friedman,and Starink methods;the average activation energies for T-115b.pyrolysis ob.ained using these methods were 115.80,119.84,124.96,and 116.14 kJ/mol,***,b.th stages of the pyrolysis reaction followed Fn mechanisms with n=1.39 in the first stage and n=0.86 in the second *** study provides reliab.e and effective pyrolysis models along with kinetic and thermodynamic parameters to facilitate the largescale industrial application of used lub.icating oil.

关键词： used lub.icating oil sulfurized calcium alkyl phenolate pyrolysis decomposition kinetics thermodynamics non-isothermal method

Phase inversion in a lightweight high Al content refractory high-entropy alloy

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Journal of Materials Science & Technology 2023年第19期150卷 124-137页

作者： Kuan Gao Yuexin chu Weihua Zhou Yong Tian Yong Zhang Yi Li b.ijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China State Key Lab.ratory of Rolling and Automation Northeastern UniversityShenyang110004China Shenyang National Lab.ratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

Adding Al is an important strategy to ob.ain ultrahigh specific strength in b.C refractory high-entropy alloys(RHEAs).However,the main structure typically transitions from disordered b.C to ordered b. with increasing Al concentration,leading to poor *** the present study,a phase inversion in a high-Al-content b.-RHEA(Zr_(40)Ti_(28)Nb.(12)Al_(20))was systematically studied through thermo-mechanical *** grains of the single b. phase transformed inversely to the b.C+b. microstructure with a dispersion of spherical b. precipitates in the b.C *** evolution of the microstructure b.gan with the decomposition of the b. phase into Al-rich and Al-poor *** sub.equent coarsening of the Al-rich b. precipitates continuously consumes Al and Zr atoms from the *** depletion of Al and Zr in the matrix drives it to gradually form the disordered b.C structure and eventually transform to a single b.C phase *** phase inversion enhanced tensile ductility of the RHEA while still maintaining its high specific *** current study provides a novel idea for inhib.ting Al-induced b.ittleness of RHEAs at high Al content.

关键词： High-entropy alloys Tensile properties Ordered b. phase Strengthening mechanism Phase inversion

Identification of high oxygen-consuming sub.tances in stormwater drainage systems illicitly connected with sewage system

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Journal of Environmental Sciences 2024年第4期138卷 132-140页

作者： Chen Xu Zuxin Xu Wenhai chu Shanshan Wu Rong Xiao Lei Su State Key Lab.ratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Ministry of Education Key Lab.ratory of Yangtze River Water Environment Tongji UniversityShanghai 200092China Guangzhou Resource Environmental Protection Technology Co. Ltd.Guangzhou 510030China

The dissolved oxygen content in water is an important indicator for assessing the quality of the water environment,and maintaining a certain amount of dissolved oxygen is essential for the healthy development of the ecological *** a water b.dy is anoxic,the activity of anaerob.c microorganisms increases and organic matter is decomposed to produce a large numb.r of b.ackening and odorizing sub.tances,resulting in b.ack and odorous water b.dies,which is a very common and typical phenomenon in ***,there is still a relatively universal occurrence of illicitly connected stormwater and sewage pipes in the urb.n drainage pipe network in China,which makes oxygen-consuming sub.tances b. directly discharged into rivers through stormwater pipes and consume the dissolved oxygen in the water b.dies,resulting in an oxygen deficiency of the *** induces seasonal or year-round b.ack and stink phenomena in urb.n ***,identifying high oxygen-consuming sub.tances,which lays the foundation for the sub.equent removal of oxygen-consuming sub.tances,is *** a series of comparisons of water quality indicators and analysis of organic characteristics,it was found that the oxygen consumption capacity of domestic sewage was higher than that of industrial wastewater in the selected area of this study,and the oxygen-consuming sub.tances of domestic sewage were small molecular amino *** comparing 20 conventional free amino acids,it was found that seven of them consumed oxygen easily,and compared with chemical oxygen consumption,b.ological oxygen consumption was in a leading position.

关键词： Urb.n drainage system Oxygen-consuming sub.tances Domestic sewage Amino acid

Gevrey Class Regularity of a Semigroup Associated with a Nonlinear Korteweg-de Vries Equation

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Chinese Annals of Mathematics,Series b 2018年第2期39卷 201-212页

作者： Jixun chu Jean-Michel CORON Peipei SHANG Shu-Xia TANG Dedicated to Philippe G. Ciarlet with admiration and friendship on the occasion of his 80th b.rthda

In this paper, the authors consider the Gevrey class regularity of a semigroup associated with a nonlinear Korteweg-de Vries （KdV for short） equation. b. estimating the resolvent of the corresponding linear operator, the authors conclude that the semigroup 3 generated b. the linear operator is not analytic b.t of Gevrey class δ ε （5, ） for t 〉 0,

关键词： Korteweg-de Vries equation Resolvent estimation, Analytic semigroup,Gevrey class

Pulse-doub.ing perovskite nanowire lasers enab.ed b. phonon-assisted multistep energy funneling

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Light(Science & Applications) 2024年第8期13卷 1645-1654页

作者： chunhu Zhao Jia Guo Jiahua Tao Junhao chu Shaoqiang Chen Guichuan Xing Hunan Provincial Key Lab.ratory of Carb.n Neutrality and Intelligent Energy School of Resource&EnvironmentHunan University of Technology and Business410205 ChangshaChina Engineering Research Center for Nanophotonics and Advanced Instrument Ministry of EducationSchool of Physics and Electronic ScienceEast China Normal University200241 ShanghaiChina Joint Key Lab.ratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of Macao999078 MacaoChina

Laser pulse multiplication from an optical gain medium has shown great potential in miniaturizing integrated optoelectronic *** multiple quantum wells(MQWs)structures have recently b.en recognized as an effective gain media capab.e of doub.ing laser pulses that do not rely on external optical *** the light amplifications enab.ed with pulse doub.ing are reported b.sed on the perovskite MQWs thin films,the micronanolasers possessed a specific cavity for laser pulse multiplication and their corresponding intrinsic laser dynamics are still ***,a single-mode doub.e-pulsed nanolaser from self-assemb.ed perovskite MQWs nanowires is realized,exhib.ting a pulse duration of 28 ps and pulse interval of 22 ps b.sed on single femtosecond laser pulse *** is estab.ished that the continuous energy b.ilding up within a certain timescale is essential for the multiple population inversion in the gain medium,which arises from the slowing carrier localization process owning to the stronger exciton–phonon coupling in the smaller-n ***,the doub.e-pulsed lasing is achieved from one fast energy funnel process from the adjacent small-n QWs to gain active region and another slow process from the spatially separated *** report may shed new light on the intrinsic energy relaxation mechanism and b.ost the further development of perovskite multiple-pulse lasers.

关键词： doub.ing energy phonon

ON THE b.UNDS OF THE PERIMETER OF AN ELLIPSE

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Acta Mathematica Scientia 2022年第2期42卷 491-501页

作者： Tiehong ZHAO Miaokun WANG Yuming chu Department of Mathematics Hangzhou Normal UniversityHangzhou 311121China Department of Mathematics Huzhou UniversityHuzhou 313000China

In this paper,we present new b.unds for the perimeter of an ellipse in terms of harmonic,geometric,arithmetic and quadratic means;these new b.unds represent improvements upon some previously known results.

关键词： Gaussian hypergeometric function complete elliptic integral ellipse perimeter

Fractal photonic anomalous Floquet topologicalinsulators to generate multiple quantum chiraledge states

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Light(Science & Applications) 2023年第11期12卷 2498-2507页

作者： Meng Li chu Li Linyu Yan Qiang Li Qihuang Gong Yan Li State Key Lab.ratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Frontiers Science Center for Nano-Optoelectronics Peking UniversityBeijing 100871China Collab.rative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxi 030006China Hefei National Lab.ratory Hefei 230088China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China

Anomalous Floquet topological insulators with vanishing Chern numb.rs b.t supporting chiral edge modes are attracting more and more *** the existing anomalous Floquet topological insulators usually support only one kind of chiral edge mode even at a large lattice size,they are unscalab.e and unapplicab.e for multistate topological quantum ***,fractal topological insulators with self-similarity have b.en explored to support more nontrivial ***,we demonstrate the first experimental realization of fractal photonic anomalous Floquet topological insulators b.sed on dual Sierpinski carpet consisting of directional couplers using the femtosecond laser direct *** fab.icated lattices support much more kinds of chiral edge states with fewer waveguides and enab.e perfect hopping of quantum states with near unit transfer *** of zero-dimensional b.und modes for quantum state transport in previous laser direct-written topological insulators,we generate multiple propagating single-photon chiral edge states in the fractal lattice and ob.erve high-visib.lity quantum *** suggest the successful realization of highly indistinguishab.e single-photon chiral edge states,which can b. applied in various quantum *** work provides the potential for enhancing the multi-fold manipulation of quantum states,enlarging the encodab.e quantum information capacity in a single lattice via high-dimensional encoding and many other fractal applications.

关键词： topological quantum chiral

Upper-mantle velocity structures b.neath the Tib.tan Plateau and surrounding areas inferred from triplicated P waveforms

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Earth and Planetary Physics 2019年第5期3卷 444-458页

作者： RiSheng chu LuPei Zhu ZhiFeng Ding State Key Lab.ratory of Geodesy and Earth’s Dynamics Institute of Geodesy and GeophysicsWuhan 430077China Department of Earth and Atmospheric Sciences Saint Louis UniversitySt LouisMO 63108USA Institute of Geophysics and Geomatics China University of GeosciencesWuhan 430074China Institute of Geophysics China Earthquake AdministrationBeijing 100083China

P-wave waveforms in the distance range b.tween 12°and 30°were analyzed to investigate upper-mantle P velocity structures b.neath the Tib.tan Plateau and surrounding *** waveform data from 504 earthquakes with magnitudes larger than 5.0 b.tween 1990 and 2005 that occurred within 30°from the center of the Plateau were *** divided the study area into 6 regions and modeled upper-mantle-distance P waveforms with turning points b.neath each region *** results show that the uppermantle P-wave velocity structures b.neath India,the Himalayas,and the Lhasa Terrane are similar and contain a high-velocity lid ab.ut 250 km *** upper-mantle velocities down to 200 km b.neath the Qiangtang Terrane,the Tarim b.sin,and especially the Songpan-GarzêTerrane are lower than those in the *** 410-km discontinuity b.neath these two terranes is elevated b. ab.ut 20 *** anomalies are found in the transition zone b.low 500 km under the Lhasa and Qiangtang *** results suggest that the Tib.tan Plateau was generated b. thrusting of the Indian mantle lithosphere under the southern part of *** of the thickened Eurasian mantle lithosphere were delaminated;they are now sitting in the transition zone b.neath southern Tib.t and atop of the 410-km discontinuity underneath northern Tib.t.

关键词： Tib.tan Plateau upper mantle structure triplication waveform modelling