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An investigation into the deformation, movement and coalescence characteristics of water-in-oil droplets in an AC electric field

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Petroleum Science 2013年第4期10卷 548-561页

作者： He Li-min Yang Dong-hai Gong Rong-na ye tuan-jie Lü Yu-ling Luo Xiao-ming College of Pipeline and Civil Engineering China University of Petroleum Beijing Petrochemical Engineering Co. Ltd. Petro China Oil & Gas Pipeline Control Center

Drop-drop coalescence is important in electric dehydrators used for oil-water separation in the oil *** deformation degree,angle between the electric field and the center line of two drops,effects of intensities and frequencies of the electric field have been studied by analyzing droplet ***,seldom have people investigated the movement and the relative velocity in the process of dropdrop *** this paper forces acting on a single droplet and horizontal water droplets in an AC electric field were analyzed,and experiments were carried out to investigate the deformation,movement and coalescence characteristics of droplets with white oil and *** a micro high-speed camera system and image processing technology,the droplet images were collected and *** results indicate that the deformation is mainly affected by the electric field intensity,frequency,droplet diameter and the oil *** field strength and large diameter facilitate deformation of drops in the electric *** effect of frequency and oil viscosity is not *** frequency and higher oil viscosity will lead to smaller oscillation *** effect of electric field intensity and droplet diameter on oscillation amplitude is not *** the center-to-center distance between droplets is large,the forces acting on droplets in the horizontal direction are mainly dipole-dipole attraction and drag *** is also the film-thinning force when droplets get *** forces are simplified and *** on force analysis and Newton＇s second law,the relative movement is analyzed in different parts,and the relationship of center-to-center distance and time is in accordance with an explinear function at different *** to experimental data,the movement of 145 μm double droplets before coalescence can be fitted well with an explinear function at two *** addition,the whole movement process is investigated and can be estimated with

关键词： Deformation coalescence velocity AC electric field

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Research on the Algorithm of Avionic Device Fault Diagnosis Based on Fuzzy Expert System

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Chinese Journal of Aeronautics 2007年第3期20卷 223-229页

作者： LI jie SHEN Shi-tuan School of Electronics and Information Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

Based on the fuzzy expert system fault diagnosis theory, the knowledge base architecture and inference engine algorithm are put forward for avionic device fault diagnosis. The knowledge base is constructed by fault query network, of which the basic ele- ment is the test-diagnosis fault unit. Every underlying fault cause＇s membership degree is calculated using fuzzy product inference algorithm, and the fault answer best selection algorithm is developed, to which the deep knowledge is applied. Using some examples the proposed algorithm is analyzed for its capability of synthesis diagnosis and its improvement compared to greater membership degree first principle.

关键词： fuzzy expert system fault query network fault answer best selection algorithm fuzzy theory test-diagnosis fault unit

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Sulfolane‑Based Flame‑Retardant Electrolyte for High‑Voltage Sodium‑Ion Batteries

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Nano-Micro Letters 2025年第2期17卷 498-516页

作者： Xuanlong He jie Peng Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua ye Xuming Yang Xiangzhong Ren Xiaoping Ouyang Jianhong Liu Biwei Xiao Jiangtao Hu Qianling Zhang Graphene Composite Research Center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Center of Electron Microscopy State Key Laboratory of Silicon and Advanced Semiconductor MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China GRINM(Guangdong)Research Institute for Advanced Materials and Technology FoshanGuangdong 528051People’s Republic of China College of Energy Engineering Zhejiang UniversityHangzhouZhejiang 310027People’s Republic of China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105People’s Republic of China Shenzhen Eigen-Equation Graphene Technology Co.Ltd Shenzhen 518000People’s Republic of China

Sodium-ion batteries hold great promise as next-generation energy storage ***,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of *** particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage ***,constructing dense and stable CEIs are crucial for high-performance *** work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous *** excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 *** addition,its nonflammable nature enhances the safety of *** work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes.

关键词： Sodium-ion batteries Sulfolane-based electrolyte High voltage Layered oxide cathode Flame retardant

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A global solution for robust parameter design of aeronautical electrical apparatus based on interactions analysis and polynomial fitting

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Chinese Journal of Aeronautics 2020年第3期33卷 910-921页

作者： jie DENG Xuerong ye Jianhu XUE Guofu ZHAI School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China Department of Research and Development Wuxi Newhongtai Electrical Technology Co.Wuxi 214174China

Robust Parameter Design(RPD) has been widely applied for improving quality and reliability of *** of the key drawbacks of applying RPD using Taguchi method is that the stable factors may not be independent of the adjustment factors, resulting in unsatisfactory ***, the Taguchi method cannot guarantee global optimality since the levels set in the experiment are usually discrete to ensure orthogonal *** this paper, robust solutions of the stable factors are obtained via a nonlinear model based on polynomial fitting;while the adjustment factors are obtained via interactions analysis so that they are independent of the stable *** particular, the values of the adjustment factors are determined by output offset compensation so as to achieve robustness of the design *** example on the design of an aeronautical electrical apparatus is presented to illustrate the *** results show that the proposed method can take full advantage of the nonlinearity in the response and achieve the desired outcome.

关键词： Aeronautical electrical apparatus Global optimization Interactions analysis Polynomial fitting Robust parameter design

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A low-boom and low-drag design method for supersonic aircraft and its applications on airfoils

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Advances in Aerodynamics 2021年第1期3卷 428-454页

作者： Liu-qing ye Zheng-yin ye Kun ye jie Wu Sheng-jie Miao School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

Sonic boom reduction has been an urgent need for the development of future supersonic transport,because of the heavy damage of noise *** paper provides a novel concept for supersonic aircraft to reduce the sonic boom and drag coefficient,wherein a suction slot near the leading edge and an injection slot near the trailing edge on the airfoil suction surface are *** make sure of a zero net mass flux flow control,the mass flow sucked in near the leading edge is equal to the mass flow injected near the trailing *** diamond and NACA0008 airfoils are adopted as the baseline airfoil to verify the capability of the proposed design *** effects of the suction and injection location,the suction and injection slot size,the mass flow rate and the attack angle on the ground boom signature and drag coefficient are studied in *** results show that the optimized airfoils with the suction and injection have benefits in both sonic boom reduction and wave drag *** the reduction of the sonic boom intensity is more sensitive to the injection near the trailing edge than the suction near the leading *** the viewpoint of aerodynamics,opening the suction and injection slots will have no adverse effect on the aerodynamic performances of the supersonic aircraft and even increase the lift-drag ratio under some *** energy saving,the suction and injection slots can be selectively opened,which are opened when the supersonic aircraft flies over the city but are closed when the aircraft flies over the sea.

关键词： Supersonic flow Sonic boom Supersonic aircraft Optimization Wave drag Low-boom low-drag design

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Liquid crystal of nanocellulose whiskers' grafted with acrylamide

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Chinese Chemical Letters 2012年第3期23卷 367-370页

作者： jie Yang Dai Yong ye School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China

12%acrylamide（AM） was grafted onto the surface of nanocellulose whiskers（NCW）,which was self-assembled to be the chiral nematic suspension at 3%*** acrylamide grafted NCW（AM-g-NCW） was characterized with Fourier Transform Infrared Spectroscopy（FTIR）.The grafting ratio was measured by elemental *** degrees of crystallinity of the AM-g-NCW were measured by X-ray diffraction（XRD）.The liquid crystalline properties of the AM-g-NCW were investigated by the polarizing optical microscopy（POM）.The AM-g-NCW was found to self-assembly to be a lyotropic state.

关键词： Nanocellulose whiskers Acrylamide Surface grafting Liquid crystal

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FDTD analysis of the optical properties of vertical ZnO nanorod array

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Science China(Technological Sciences) 2014年第6期57卷 1147-1153页

作者： SHU Yue ye Hong CHEN jie Department of Thermal Science and Energy Engineering University of Science and Technology of China National Institute of Clean-and-Low-Carbon Energy (NICE)

Based on the structure and dimensions of a vertical ZnO nanorod array(V-ZNA)sample,an ideal 2-D photonic crystal model was *** optical properties of the V-ZNAs were analyzed with finite-difference time-domain(FDTD)method,and the influences of the geometry parameters,including the circumcircle diameters of the top and bottom surfaces(Dt and Db)and the height(H)of the nanorods,and the pitch between each column(L),were *** transmittance and low reflectance in the waveband of 400–800 nm were proved,and the highest transmittance can be obtained with Dt<50 nm,H=200 nm,and Db/L=0.85,which was verified by Effective Index Method(EIM).The result indicates that V-ZNAs can be used as excellent light coupling element and antireflection material for solar energy applications.

关键词： V-ZNAs FDTD method transmittance reflectance EIM

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Truncation and aliasing errors for Whittaker-Kotelnikov-Shannon sampling expansion

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Applied Mathematics(A Journal of Chinese Universities) 2012年第4期27卷 412-418页

作者： ye Pei-xin SONG Zhan-jie School of Mathematics and LPMC Nankai UniversityTianjin 300071China Department of Mathematics School of ScienceTianjin UniversityTianjin 300072China

Let B^pΩ, 1 ≤ p 〈 ∞, be the space of all bounded functions from Lp（R） which can be extended to entire functions of exponential type Ω. The uniform error bounds for truncated Whittaker-Kotelnikov-Shannon series based on local sampling are derived for functions f ∈ B^pΩ without decay assumption at infinity. Then the optimal bounds of the aliasing error and truncation error of Whittaker-Kotelnikov-Shannon expansion for non-bandlimited functions from Sobolev classes L/（Wp（R）） are determined up to a logarithmic factor.

关键词： Whittaker-Kotelnikov-Shannon theorem localized sampling truncation error aliasing error,Sobolev class.

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Fast Growth Entire Functions Whose Escaping Set Has Hausdorff Dimension Two

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Chinese Annals of Mathematics,Series B 2019年第4期40卷 481-494页

作者： jie DING Jun WANG Zhuan ye School of Mathematics Taiyuan University of TechnologyTaiyuan 030024China School of Mathematics Fudan UniversityShanghai 200433China Department of Mathematics and Statistics Univeristy of North Carolina WilmingtonWilmingtonNC 28403USA

The authors study a family of transcendental entire functions which lie outside the Eremenko-Lyubich class in general and are of infinity growth order. Most importantly,the authors show that the intersection of Julia set and escaping set of these entire functions has full Hausdorff dimension. As a by-product of the result, the authors also obtain the Hausdorff measure of their escaping set is infinity.

关键词： Dynamic systems Entire function Julia set Escaping set Hausdorff dimension

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DYNAMICAL PREDICTION OF WEST CHINA AUTUMN RAINFALL BY THE NCEP CLIMATE FORECAST SYSTEM

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Journal of Tropical Meteorology 2019年第1期25卷 114-128页

作者： DONG Shao-rou YANG Song ZHANG tuan-tuan FENG ye-rong School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen University Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction

This study investigates the variation and prediction of the west China autumn rainfall(WCAR) and their associated atmospheric circulation features, focusing on the transitional stages of onset and demise of the *** from the 45-day hindcast by the National Centers for Environmental Prediction(NCEP) Climate Forecast System version 2(CFSv2) and several observational data sets are used. The onset of WCAR generally occurs at pentad 46 and decays at pentad 56, with heavy rainfall over the northwestern China and moderate rainfall over the south. Before that,southerly wind changes into southeasterly wind, accompanied by a westward expansion and intensification of the western Pacific subtropical high(WPSH), favoring rainfall over west China. On the other hand, during the decay of WCAR, a continental cold high develops and the WPSH weakens and shifts eastward, accompanied by a demise of southwest monsoon flow, leading to decay of rainfall over west China. The CFSv2 generally well captures the variation of WCAR owing to the high skill in capturing the associated atmospheric circulation, despite an overestimation of rainfall. This overestimation occurs at all time leads due to the overestimated low-level southerly wind. The CFSv2 can pinpoint the dates of onset and demise of WCAR at the leads up to 5 days and 40 days, respectively. The lower prediction skill for WCAR onset is due to the unrealistically predicted northerly wind anomaly over the lower branch of the Yangtze River and the underestimated movement of WPSH after lead time of 5 days.

关键词： west China autumn rainfall NCEP CFSv2 prediction predictable patterns

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