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Particle contact angle at the oil-water interface: Effect of surface silanization

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Particuology 2019年第3期17卷 218-224页

作者： Keliang wang gang wang Chunjing Lu Key Laboratory of Enhanced Oil Recovery of Ministry Education Northeast Petroleum University Daqing 163000 China

A novel and efficient method was developed to vary the particle contact angle (θ) at the wax-water interface by tailoring the degree of Υ-aminopropyltriethoxysilane (APTES) grafting onto silica *** three-phase θ determines the degree of particle penetration into the respective *** the APTES grafting density of the silica particles resulted in a three-phase θ increase from 22° to 70°.Furthermore,increasing APTES grafting density results in silica particles packing more closely and orderly on the surface of the wax colloidosomes.A series of fluorinated Janus particles were prepared by the subsequent surface chemical modification of the modified silica particles adsorbed on the wax *** particles with tailored APTES grafting densities can be utilized to tune the Janus balance during the synthesis of Janus particles based on Pickering emulsion methods.

关键词： Janus particles Surface modification Aminopropyltriethoxysilane Pickering emulsions Contact angle

Bounds of Deviation for Branching Chains in Random Environments

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Acta Mathematica Sinica,English Series 2011年第5期27卷 897-904页

作者： Wei gang wang School of Statistics and Mathematics Zhejiang Gongshang University Hangzhou 310018 P. R. China

We consider non-extinct branching processes in general random environments. Under the condition of means and second moments of each generation being bounded, we give the upper bounds and lower bounds for some form dev... 详细信息

关键词： Branching processes in random environments deviation, upper bound, lower bound

Radiative Decays of (0^+,1^+) Strange-Bottom Mesons

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Communications in Theoretical Physics 2009年第7期52卷 91-98页

作者： wang Zhi-gang Department of Physics North China Electric Power University Baoding 071003 China

In this article, we assume that the （0^＋,1^＋） strange-bottom mesons are the conventional bs mesons, and calculate the electromagnetic coupling constants d, g1, g2, and g3 using the light-cone QGD sum rules. Then we study the radiative decays Bs0→Bs^＊γ, Bs1→Bsγ, Bs1→Bs^＊γ, and Bs1→Bs0γ, and observe that the widths are rather narrow. We can search for the （0^＋, 1^＋） strange-bottom mesons in the invariant Bsπ^0 and Bs^＊π^0 mass distributions in the strong decays or in the invariant Bs^＊γ, and Bsγ mass distributions in the radiative decays.

关键词： strange-bottom mesons light-cone QCD sum rules

A leakage particle-wall impingement based vibro-acoustic characterization of the leaked sand-gas pipe flow

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Particuology 2021年第2期19卷 84-93页

作者： Kai wang Yinan Hu Min Qin gang Liu Yichen Li gang wang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Metering Test Center China Academy of Engineering PhysicsMianyang 621900China

Solid particle leakage detection in double-wall pipes is industrially important,especially in chemical and petroleum ***,we developed vibration and acoustic sensor approaches for the characterization and comparative study of the applicability of leakage sand particle detection from the flow of gas pipes.A specific wideband vibration sensor and pressure-field microphone were selected to identify the vibro-acoustic characteristics within 50 kHz of the particle *** vibro-acoustic time-behaviours and characteristic frequencies of particle leakage were observed by the time-frequency *** leakage gas flow noise was verified by coherence analysis and minimized by a digital bandpass and band-elimination *** experiments were performed,and good agreement was found between the release pressures(0.1-0.3 MPa)with different leak sizes(0-8 mm)under different sand masses(120μm)and vibro-acoustic Root-Mean-Square(RMS)*** the comparison of the two methods,the vibration method has a better frequency response for the leakage flow and is good for identifying whether there are particle *** acoustic method has a time behaviour response and is good for establishing the relationship between the particle mass and *** addition,the acoustic method has frequency shift features with a better signal to noise *** acoustic method lays the foundation for future work of more complex leakage detection combining the advantages of vibration and the acoustic method.

关键词： Solid particle detection Vibration and acoustic Sand-gas flow Pipe leak

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煤体注水渗流模型构建及微观主控影响规律

工程科学学报 2025年第2期47卷 271-281页

作者：王恩茂王刚解树亮魏宏钊冯净梁瀚丹山东科技大学安全与环境工程学院青岛266590 山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地青岛266590

煤层注水技术是目前矿井除尘的主要技术手段之一,起到润湿煤体、源头减尘的作用.但随着开采深度的增加,煤体孔隙率相对较低,极大影响煤层注水的润湿效果.因此,为了提高煤层注水的效果,结合煤体固有属性、孔隙尺度等影响因素,首先,引入... 详细信息

煤层注水技术是目前矿井除尘的主要技术手段之一,起到润湿煤体、源头减尘的作用.但随着开采深度的增加,煤体孔隙率相对较低,极大影响煤层注水的润湿效果.因此,为了提高煤层注水的效果,结合煤体固有属性、孔隙尺度等影响因素,首先,引入连通孔隙率,建立了包含孔喉、等效孔径、有效孔隙率、毛细管束、迂曲度、流动路径在内的渗流模型;其次,采用高精度射线显微镜(μ-CT)对内蒙古煤矿、同富新煤矿、梅花井煤矿、大黄山煤矿以及磁窖沟煤矿5个煤矿的不同变质程度煤进行扫描,三维重建可视化煤体微观有效孔隙结构,运用分形理论,提取煤体有效连通孔隙结构参数进行计算;再次,通过实验对5个煤矿不同变质程度的煤进行渗透率实测;最后,引入“敏感度”来表征每种影响因素对渗流量的影响程度,运用Morris筛选法,将数值分析法与渗流模型相耦合,定量筛选了煤体坚固性系数、迂曲度分形维数、有效孔隙率、体积分形维数、孔喉半径等主控因素,并分析了各主控因素对注水能力的影响规律.本研究建立了一个综合煤体坚固性系数、迂曲度分形维数、有效孔隙率、体积分形维数和孔喉半径的渗流模型.分析表明,影响注水能力的主控因素依次为煤体坚固性系数、迂曲度分形维数、有效孔隙率、体积分形维数和孔喉半径.注水能力与煤体坚固性系数呈正弦函数关系,随着有效孔隙率的增加,迂曲度分形维数和体积分形维数的减小,注水能力增强.研究结果可为进一步完善煤层注水渗流理论、增强煤层注水润湿效果,防治矿井粉尘灾害提供理论依据.

关键词：煤层注水有效连通孔隙渗流模型主控因素计算机断层扫描

Brauer-type bounds for Hadamard product of nonnegative tensors

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Frontiers of Mathematics in China 2020年第3期15卷 555-570页

作者： gang wang Yuan ZHANG Yiju wang School of Management Science Qufu Normal UniversityRizhao 276826China

In this paper,we establish some Brauer-type bounds for the spectral radius of Hadamard product of two nonnegative tensors based on Brauer-type inclusion set,which are shown to be sharper than the existing bounds estab... 详细信息

关键词： Hadamard product nonnegative tensor Brauer-type inclusion set spectral radius

Pore-scale modeling of pore structure properties and wettability effect on permeability of low-rank coal

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International Journal of Mining Science and Technology 2023年第5期33卷 573-584页

作者： Xiangjie Qin Jianchao Cai gang wang State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

Permeability is a key parameter for coalbed methane *** the absolute permeability of coal has been extensively studied,wettability and pore structure properties continue to challenge the microscopic description of water-gas flow in *** this purpose,we reconstructed the microstructures of low-rank coal using micro-computed tomography(micro-CT)*** geometry and pore-throat parameters are introduced to establish a relationship with absolute permeability.A dual-porosity pore network model is developed to study water-gas displacement under different wetting and pore structure *** show that absolute permeability is significantly affected by pore geometry and can be described using a binary quadratic function of porosity and fractal ***-gas relative permeability varies significantly and the residual gas saturation is lower;the crossover saturation first decreased and then increased with increasing porosity under hydrophobic *** the water relative permeability is lower and a certain amount of gas is trapped in complex pore-throat networks;the crossover saturation is higher under hydrophilic *** with large percolating porosity and well-developed pore networks have high displacement efficiency due to low capillary resistance and avoidance of *** work provides a systematic description of absolute permeability and water-gas relative permeability in coal microstructure for enhanced gas recovery.

关键词： Micro-CT Permeability Wetting condition Pore structure properties Water-gas flow

Analysis of Mass Difference of the π and ρ with Bethe–Salpeter Equation

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Chinese Physics Letters 2011年第8期28卷 39-42页

作者： wang Zhi-gang Department of Physics North China Electric Power UniversityBaoding 071003

PDF(474KB)Export:BibTeX|EndNote|Reference Manager|ProCite|RefWorks Abstract The one-pion exchange force in addition to the one-gluon exchange force is taken into account to study the mass difference of theπandρmesons with the Bethe–Salpeter *** projecting the Bethe–Salpeter equation into a simple form,it can be seen explicitly that the bound energy|Eπ|≫|Eρ|.

关键词： equation Bethe exchange

Urban Sensing Based on Mobile Phone Data:Approaches,Applications,and Challenges

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IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 627-637页

作者： Mohammadhossein Ghahramani MengChu Zhou gang wang Insight Centre for Data Analytics University College DublinDublin 4Ireland IEEE Helen and John C.Hartmann Department of Electrical and Computer Engineering New Jersey Institute of TechnologyMacao 999078China Institute of Systems Engineering Macao University of Science and TechnologyMacao 999078China China Telecom at Macao Macao 999078China

Data volume grows explosively with the proliferation of powerful smartphones and innovative mobile *** ability to accurately and extensively monitor and analyze these data is *** concern in cellular data analysis is related to human beings and their *** to the potential value that lies behind these massive data,there have been different proposed approaches for understanding corresponding *** that end,analyzing people's activities,e.g.,counting them at fixed locations and tracking them by generating origindestination matrices is *** former can be used to determine the utilization of assets like roads and city *** latter is valuable when planning transport *** insights allow a government to predict the adoption of new roads,new public transport routes,modification of existing infrastructure,and detection of congestion zones,resulting in more efficient designs and *** data exploration can help research in various fields,e.g.,urban planning,transportation,health care,and business *** can also help organizations in decision making,policy implementation,monitoring,and evaluation at all *** work aims to review the methods and techniques that have been implemented to discover knowledge from mobile phone *** classify these existing methods and present a taxonomy of the related work by discussing their pros and cons.

关键词： Big data analysis human mobility origin destination matrices smart infrastructure urban planning