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Probing the effect of Young's modulus on the plugging performance of micro-nano-scale dispersed particle gels

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Petroleum Science 2022年第2期19卷 688-696页

作者： Zhi-Xuan Zhu Lin Li jia-wei liu jia Chen Zhong-Zheng Xu Yi-Ning Wu Cai-Li Dai Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao 266580ShandongChina Shandong Key Laboratory of Oilfield Chemistry Department of Petroleum EngineeringChina University of Petroleum(East China)Qingdao 266580ShandongChina State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580ShandongChina

The effect of mechanical strength of the dispersed particle gel(DPG)on its macro plugging performance is significant,however,little study has been *** this paper,DPG particles with different mechanical strengths were obtained by mechanical shearing of bulk gels prepared with different ***’s moduli of DPG particles on the micro and nano scales were measured by atomic force microscope for the first *** mapping relationship among the formula of bulk gel,the Young’s moduli of the DPG particles and the final plugging performance were *** results showed that when the Young’s moduli of the DPG particles increased from 82 to 328 Pa,the plugging rate increased significantly from 91.46%to 97.10%due to the distinctly enhanced stacking density and strength at this *** when the Young’s moduli of the DPG particles surpassed 328 Pa,the further increase of plugging rate with the Young’s moduli of the DPG particles became *** results indicated that the improvement of plugging rate was more efficient by adjusting the Young’s moduli of the DPG particles within certain ranges,providing guidance for improving the macroscopic application properties of DPG systems in reservoir heterogeneity regulation.

关键词： Dispersed particle gel Mechanical strength Young’s modulus Atomic force microscope Plugging performance

Changes in Spring Snow Cover over the Eastern and Western Tibetan Plateau and Their Associated Mechanism

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Advances in Atmospheric Sciences 2024年第5期41卷 959-973页

作者： Fangchi liu Xiaojing jia wei DONG Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouZhejiang 310058China

The spring snow cover(SC)over the western Tibetan Plateau(TP)(TPSC)(W_TPSC)and eastern TPSC(E_TPSC)have displayed remarkable decreasing and increasing trends,respectively,during 1985–*** current work investigates the possible mechanisms accounting for these distinct TPSC *** results indicate that the decrease in W_TPSC is primarily attributed to rising temperatures,while the increase in E_TPSC is closely linked to enhanced *** circulation analysis shows that the essential system responsible for the TPSC changes is a significant anticyclonic system centered over the northwestern *** anomalous descending motion and adiabatic heating linked to this anticyclone leads to warmer temperatures and consequent snowmelt over the western ***,anomalous easterly winds along the southern flank of this anticyclone serve to transport additional moisture from the North Pacific,leading to an increase in snowfall over the eastern *** analysis reveals that the anomalous anticyclone is associated with an atmospheric wave pattern that originates from upstream *** warming of the subtropical North Atlantic(NA)sea surface temperature(SST)induces an atmospheric pattern resembling a wave train that travels eastward across the Eurasian continent before reaching the ***,the decline in winter sea ice(SIC)over the Barents Sea exerts a persistent warming influence on the atmosphere,inducing an anomalous atmospheric circulation that propagates southeastward and strengthens the northwest TP anticyclone in ***,an enhancement of subtropical stationary waves has resulted in significant increases in easterly moisture fluxes over the coastal areas of East Asia,which further promotes more snowfall over eastern TP.

关键词： snow cover Tibetan Plateau long-term changes spring

Study on synthesis and distribution in vivo of 5-Fu-cholic acid conjugate

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Chinese Chemical Letters 2009年第2期20卷 136-138页

作者： Jie Li Li Hai wei jia liu Xiao Chun Wu Yong Wu Key Laboratory of Drug Targeting of Education Ministry West China School of Pharmacy Sichuan University Chengdu 610041 China Sichuan Normal University Chemistry and Material College Chengdu 610066 China

A series of hepatic targeting drugs, 5-Fu-cholic acid conjugate T1-T5, were synthesized. 5-Fu and cholic acid was selected as starting material, after N-hydroxymethylation, condensation, hydrogenolysis to obtain carboxylated 5-Fu 5a-e. Carboxylated 5-Fu 5a-e were condensated with intermediate 3-hydroxyethyl cholic acid benzyl ester 6 to get 7a-e, 7a-e were deprotected to get T1- T5.

关键词： Hepatic targeting drugs Cholic acid Synthesis

Growth and characterizations of CdGeAs2single crystal by descending crucible with rotation method

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Rare Metals 2014年第2期33卷 210-214页

作者： wei Huang Bei-Jun Zhao Shi-Fu Zhu Zhi-Yu He Bao-Jun Chen Jing-Jing Tang wei-jia liu Department of Materials Science Sichuan University

By the method of descending crucible with rotation, crack-free CdGeAs2single crystals of U15 mm 950 mm were grown in a furnace with three independen heating zones after optimizing the temperature field, and the descending and rotational speed to meet the need of CdGeAs2crystal growth. The properties of as-grown crysta were characterized by a variety of techniques. The results of X-ray diffraction（XRD） show that there are two cleavage faces, which are（110） and（101）. The peaks are in high intensity and good symmetry, which demonstrates that the crystal is integral in structure and well crystallized. The energy-dispersive spectrometry results indicate that the wafer of the CdGeAs2crystal is closer to the stoichiometry The IR transmittance of the wafer is ＊48.6 % at 5.5 lm, and the maximum value is up to 51.6 % in the range of2.3–18.0 lm. Etch pits of（001） face are observed and the density of the etch pits is evaluated to be 1 9 105cm-2.

关键词： CdGeAs2 crystal Crystal growth X-ray diffraction IR transmittance

Precise measurement of geometric and physical quantities in cutting tools inspection and condition monitoring: A review

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Chinese Journal of Aeronautics 2024年第4期37卷 23-53页

作者： Wenqi WANG wei liu Yang ZHANG Yang liu Peidong ZHANG Zhenyuan jia State Key Laboratory of High-Performance Precision Manufacturing Dalian University of TechnologyDalian 116024China

As one of the most important terminals in machining, cutting tools have been widely used for components manufacturing in aerospace and other industries. The quality of these components and processing efficiency are closely linked to the performance of cutting tools. Therefore, it is essential and critical to inspect the cutting tools and monitor the condition during the stage of manufacturing and machining. This review aims to discuss and summarize the key problems, methods,and techniques from the perspective of the tool geometric and the physical quantities measurement,including machine vision, physical sensors and data processing. It is worth mentioning that we focus on the topic of precision measurement methods and discuss universal solutions by identifying the common characteristics of the measured quantities. Eventually, the challenges and future trends for the development of in-depth research and practical applications are concluded. The research and application of precise measurement techniques for geometric and physical quantities will better promote the development of intelligent manufacturing.

关键词： Cutting tools Mechanical measurement Machine vision Physical sensors Tool condition monitoring

Experimental,Numerical,and Analytical Studies on the Bending of Mechanically Lined Pipe

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China Ocean Engineering 2024年第2期38卷 221-232页

作者： wei Wen-bin YUAN Lin ZHOU jia-sheng liu Zheng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China School of Mechanical Engineering Tianjin UniversityTianjin 300072China

Mechanically lined pipe(MLP)is often used for offshore oil and gas transport because of its low cost and corrosion *** installation and operation,the pipe may undergo severe bending deformation,which causes the liner to separate from the outer pipe and buckles,affecting the stability of the whole *** this paper,the buckling response of MLP subjected to bending is investigated to clarify its bending characteristics by employing both experiments,numerical simulation,as theoretical *** types of MLPs were manufactured with GB 45 carbon steel(SLP)and Al 6061(ALP)used as the outer pipe material,*** hydraulic expansion and bending experiments of small-scale MLPs are *** addition to the ovalized shape of the cross-section for the SLP specimens,the copper liner was found to wrinkle on the compressive *** contrast,the liner of ALP remains intact without developing any wrinkling and collapse *** addition,a dedicated numerical framework and theoretical models were also *** was found both the manufacturing and bending responses of the MLP can be well reproduced,and the predicted maximum moment and critical curvatures are in good agreement with the experimental results.

关键词： lined pipe bending nonlinear ring theory buckling plasticity

Effect of the number of irradiation holes on rock breaking under constant laser energy

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Petroleum Science 2022年第6期19卷 2969-2980页

作者： Hai-Zeng Pan Yi Hu Yong Kang Ze-Feng Wang jia-wei liu Hao Chen Meng-Da Zhang Hubei Key Laboratory of Waterjet Theory and New Technology Wuhan UniversityWuhan430072HubeiChina School of Power and Mechanical Engineering Wuhan UniversityWuhan430072HubeiChina The Institute of Technological Sciences Wuhan UniversityWuhan430072HubeiChina School of Urban Construction Wuhan University of Science and TechnologyWuhan430081HubeiChina jianghan Machinery Research Institute Limited Company of CNPC Wuhan430000HubeiChina

The use of mechanical drilling in accessing energy resources stored in deep and hard rock formations is becoming increasingly ***,laser irradiation has emerged as a novel drilling method with considerable in this *** study examines the variation of rock fracture length,fracture tortuosity,hole size,and rock breaking efficiency for a different number of holes and laser power,based on the constant total energy of laser *** indicated by the results,increasing the laser power increases the laser intensity,which helps increase the hole diameter and ***,for the same laser power,increasing the number of irradiated holes reduces the laser energy absorbed by each hole,which is not conducive to increasing the hole *** the number of holes increases,the mass loss of the rock also increases,while both specific energy(SE)and modified specific energy(MSE)*** the number of holes remains the same,the mass of the shale removed by low power is less than that removed by high power,while SE and MSE have an inverse relation with ***,high laser power and multiple-hole irradiation are more conducive to rock ***,the fracture length and fracture tortuosity of the rock irradiated by the low laser power will increase first and then decrease with the increase in the number of holes,and reach the peak value when the irradiation takes place through three *** a high-power laser irradiates the rock,the fracture length and tortuosity will increase with the increase in the number of irradiation *** is because a rock irradiated by low power dissipates more energy,with the result that the energy absorbed by the sample with four irradiation holes is not enough to break the rock *** study is expected to provide some guidance to break rock for drilling deep reservoirs and hard rock formations using laser irradiation.

关键词： Number of irradiation holes Rock breaking Fracture tortuosity Macrofracture

A Note on B-Subdifferential of Projection Operator on Polyhedral Set

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Journal of the Operations Research Society of China 2024年第3期12卷 837-845页

作者： Hao-Yang liu jia Wu Li-wei Zhang Institute of Operations Research and Control Theory School of Mathematical SciencesDalian University of TechnologyDalian116024LiaoningChina

This note characterizes the set of Fréchet-differentiable points of the projection operator on a polyhedral set and the B-subdifferential of this projection operator at any point.

关键词： Polyhedral set Projection operator B-subdifferential Strong regularity

Comparison of three kinds of polarized Bessel vortex beams propagating through uniaxial anisotropic media

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Chinese Physics B 2019年第9期28卷 237-248页

作者： jia-wei liu Hai-Ying Li wei Ding Lu Bai Zhen-Sen Wu Zheng-Jun Li School of Physics and Optoelectronic Engineering Xidian University

A comparison of differently polarized Bessel vortex beams propagating through a uniaxial anisotropic slab is discussed in terms of the vector wave function *** magnitude profiles of electric field components, the transformation of polarization modes, and the distributions of orbital angular momentum(OAM) states of the reflected and transmitted beams for different incident angles are numerically *** results indicate that the magnitude profiles of electric field components for different polarization modes are distinct from each other and have a great dependence on the incident angle,thus the transformation of polarization modes which reflects the change of energy can be affected *** compared to the x and circular polarization incidences, the reflected and transmitted beams for the radial polarization incidence suffer the fewest transformation of polarization modes, showing a better energy *** distributions of OAM states of the reflected and transmitted beams for different polarization modes are diverse as well, and the derived OAM states of the transmitted beam for radial polarization present a focusing effect, concentrating on the state between two predominant OAM states.

关键词： orbital angular momentum Bessel vortex beams reflection and transmission polarization