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Journal of Magnesium and Alloys 2023年第1期11卷 287-300页

作者： Honggun Song zhidong Xu Lahouari Benabou zheng Yin Hongyu Guan Hong Yan Luo Chao Zhi Hu Xudong Wang Department of Mechanical and Electrical Engineering Nanchang UniversityNanchang330031China UniversitéParis-Saclay UVSQLISV78124Vélizy-VillacoublayFrance Institute for Advanced Study Nanchang UniversityNanchang330031China

The corrosion inhibition behavior of Mg-8Li-3Al alloy in NaCl solution with sodium dodecyl sulfate(SDS)was investigated by hydrogen analysis,scanning electron microscopy(SEM),electrochemical test,scanning Kelvin probe force microscopy(SKPFM)and computational *** showed that the corrosion resistance of Mg-8Li-3Al alloy in NaCl solution was effectively improved with *** SEM and SKPFM results confirmed a dense,200 nm-thick SDS-adsorbed layer had formed on the alloy *** separation energy ΔE_(gap) and adsorption energy E_(ads) of SDS on the Mg surface were calculated by density functional theory and molecular dynamics simulations,*** the corrosion inhibition mechanism was hypothesized and described.

关键词： Mg-Li alloy Corrosion Sodium dodecyl sulfate Scanning kelvin probe force microscopy Density functional theory Molecular dynamics

训练方式和训练周期对隐性肥胖者内脏和皮下脂肪的影响

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中国组织工程研究 2025年第11期29卷 2340-2346页

作者：郭新峰梁芝栋陈荟宇李阳郑州工商学院体育学院河南省郑州市451400

背景:研究表明,运动干预比单纯的药物治疗或限制饮食在减脂方面可能更具优势,但同时研究训练方式与训练周期对肥胖人群内脏和皮下脂肪影响的研究较少见。目的:探究训练方式和训练周期对隐性肥胖女大学生内脏和皮下脂肪的影响。方法:招... 详细信息

背景:研究表明,运动干预比单纯的药物治疗或限制饮食在减脂方面可能更具优势,但同时研究训练方式与训练周期对肥胖人群内脏和皮下脂肪影响的研究较少见。目的:探究训练方式和训练周期对隐性肥胖女大学生内脏和皮下脂肪的影响。方法:招募郑州工商学院隐性肥胖(体质量指数<24 kg/m^(2)且体脂含量百分数≥30%)女大学生63名,采用抽签法随机分为高强度间歇性训练组(n=32)、中等强度持续性训练组(n=31)。两组受试者均在跑台上进行对应强度的运动训练,并保证两组运动量相当,每周3次,每4周为1个训练周期,为期16周。训练前及每个训练周期末,使用对应的测试装置测量被试内脏脂肪、皮下脂肪及整体脂肪情况。结果与结论:(1)重复测量F检验结果显示,内脏脂肪面积、内脏脂肪指数、腹部皮下脂肪厚度、体脂含量和体质量指数的训练周期主效应显著,肱三头肌和肩胛骨部位皮下脂肪厚度的训练方式主效应显著,所有指标训练方式和训练周期的交互效应均显著(P均<0.05);(2)简单效应检验结果显示,训练第4,12周末的内脏脂肪面积和内脏脂肪指数,训练第8,12周末的肱三头肌、肩胛骨和腹部皮下脂肪厚度,以及第8周末体脂含量和体质量指数的训练方式简单效应显著;组内所有指标训练周期的简单效应显著;(3)多重比较结果显示,高强度间歇性训练组训练第4,8,12,16周末的内脏脂肪面积、内脏脂肪指数、体脂含量、体质量指数和腹部皮下脂肪厚度依次下降,训练第8,12,16周末肱三头肌和肩胛骨部位的皮下脂肪厚度依次下降(P均<0.05);中等强度持续性训练组训练第8,12,16周末的内脏脂肪面积、内脏脂肪指数、肱三头肌和肩胛骨部位皮下脂肪厚度以及体脂含量和体质量指数依次下降,训练第4,8,12,16周末的腹部皮下脂肪厚度依次下降(P均<0.05);(4)结果显示,训练方式和训练周期均是影响隐性肥胖女大学生内脏和皮下脂肪的因素,训练方式主要影响肱三头肌和肩胛骨部位皮下脂肪,但在较长训练周期中减脂效果可能趋同;训练周期主要影响内脏脂肪面积、内脏脂肪指数、腹部皮下脂肪、体脂含量和体质量指数。

关键词：训练方式训练周期女大学生隐性肥胖内脏脂肪皮下脂肪

Intelligent architecture modeling for multilevel fluvial reservoirs based on architecture interface and elements

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Energy Geoscience 2024年第1期5卷 293-310页

作者： Bo Niu Xiangyang Hu Shuijian Wei Wenbo zheng Jie Xu Bin Liu zhidong Bao Petroleum Exploration&Production Research Institute SinopecBeijing100083China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China

At present,the architecture modeling method of fluvial reservoirs are still *** methods usually use grids to characterize architecture interbeds within the *** to the thin thickness of this type of the interlayers,the number of the model grids must be greatly *** number of grids in the tens of millions often makes an expensive computation;however,upscaling the model will generate a misleading *** above confusion is the major reason that restricts the largescale industrialization of fluvial reservoir architecture models in oilfield development and ***,this paper explores an intelligent architecture modeling method for multilevel fluvial reservoirs based on architecture interface and *** on the superpositional relationship of different architectural elements within the fluvial reservoir,this method uses a combination of multilevel interface constraints and non-uniform grid techniques to build a high-resolution 3D geological model for reservoir *** the grid upscaling technology of heterogeneous architecture elements,different upscaling densities are given to the lateral-accretion bedding and lateral-accretion bodies to simplify the model *** new method greatly reduces the number of model grids while ensuring the accuracy of lateral-accretion bedding models,laying a foundation for large-scale numerical simulation of the subsequent industrialization of the architecture *** method has been validated in A layer of X oilfield with meandering fluvial channel sands as reservoirs and B layer of Y oilfield with braided river sands as *** simulation results show that it has a higher accuracy of production history matching and remaining oil distribution forecast of the targeted sand *** numerical simulation results show that in the actual development process of oilfield,the injected water will not displace oil in a uniform diffusive manner as traditionally assu

关键词： Architecture modeling Interface restriction Architectural element Fluvial deposits Mid-channel bar Point bar

A New Algorithm for the Establishing Data Association Between a Camera and a 2-D LIDAR

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Tsinghua Science and Technology 2014年第3期19卷 314-322页

作者： Lipu Zhou zhidong Deng the State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and TechnologyDepartment of Computer Science and TechnologyTsinghua University

In this paper,we propose a new algorithm to establish the data association between a camera and a 2-D Light Detection And Ranging sensor （LIDAR）.In contrast to the previous works,where data association is established by calibrating the intrinsic parameters of the camera and the extrinsic parameters of the camera and the LIDAR,we formulate the map between laser points and pixels as a 2-D *** line-point correspondence is employed to construct geometric constraint on the homography *** enables checkerboard to be not essential and any object with straight boundary can be an effective *** calculation of the 2-D homography matrix consists of a linear least-squares solution of a homogeneous system followed by a nonlinear minimization of the geometric error in the image *** the measurement quality impacts on the accuracy of the result,we investigate the equivalent constraint and show that placing the calibration target nearby the 2-D LIDAR will provide sufficient constraints to calculate the 2-D homography *** and experimental results validate that the proposed algorithm is robust and *** with the previous works,which require two calibration processes and special calibration targets such as checkerboard,our method is more flexible and easier to perform.

关键词： sensor fusion 2-D homography extrinsic calibration camera calibration

A review of 20 years of naive tests of significance for high-dimensional mean vectors and covariance matrices

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Science China Mathematics 2016年第12期59卷 2281-2300页

作者： HU Jiang BAI zhidong Key Laboratory for Applied Statistics of Ministry of Education Northeast Normal University

We introduce the so-called naive tests and give a brief review of the new developments. Naive testing methods are easy to understand and perform robustly, especially when the dimension is large. We focus mainly on reviewing some naive testing methods for the mean vectors and covariance matrices of high-dimensional populations, and we believe that this naive testing approach can be used widely in many other testing problems.

关键词： naive testing methods hypothesis testing high-dimensional data multivariate analysis of variance(MANOVA)

Inversion of particle size distribution from light-scattering data using a modified regularization algorithm

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Particuology 2010年第4期8卷 365-371页

作者： Yanmin Wang Guobiao Liang zhidong Pan College of Materials Science Engineering South China University of Technology Guangzhou 510640 China Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology Ministry of Education South China University of Technology Guangzhou 510640 China

A modified regularization algorithm with a more proper operator was proposed for the inversion of particle size distribution （PSD） from light-scattering data in a laser particle sizer based on the Mie scattering principle. The Generalized Cross-Validation （GCV） method and the L-curve method were used for deter- mining the regularization parameter. The Successive Over-Relaxation （SOR） iterative method was used to increase the exactness and stability of the converged result. The simulated results based on the modified algorithm are in a good agreement with the experimental data measured for nine standard particulate samples, their mixtures as well as three natural particulate materials with irregular shapes, indicating that this modified regularization method is not only feasible but also effective for the simulation of PSD from corresponding light-scattering data.

关键词： Particle size measurement Mie scattering Laser particle size analyzerInverse algorithm

Prediction of aggregation behavior of submicron-sized particles of praseodymium-doped zirconium silicate in aqueous suspension by population balance model

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Particuology 2016年第2期14卷 83-92页

作者： Libin Liang Yanmin Wang zhidong Pana, School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China Guangdong KITO Ceramics Co. Ltd. Foshan 528031 China

The aggregation behavior of submicron-sized particles of praseodymium-doped zirconium silicate, a ceramic pigment, in aqueous suspension was predicted by a modified population balance model, In the model, the collision frequencies were selected to describe evolution of the particle size distribution of the suspension. The collision efficiency was estimated as a function of interaction potential between particles based on Derjaguin-Landau-Verwey-Overbeek theory. The population balance model was modified to predict the stable state of the aggregation by introducing the volume mean size of aggregate to stability ratio. In addition, aggregation of the particles in aqueous suspension in the presence of sodium dodecyl benzene sulfonate or potassium chloride was experimentally investigated. The predicted data （i.e., the final aggregate size, aggregation rate, and particle size distribution） were similar to the experimentalresults.

关键词： Population balance model Aggregation Surface forces Colloidal suspensions Praseodymium-doped zirconium silicate

Synthesis and characterization of (Ni,Sb)-co-doped rutile ceramic pigment via mechanical activation-assisted solid-state reaction

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Particuology 2018年第6期16卷 20-29页

作者： Shi Zhang zhidong Pan Yanmin Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

(Ni,Sb)-co-doped rutile yellow ceramic pigments were synthesized via a mechanical activation-assisted solid-state reaction in a stirred bead *** effects of mechanical grinding of the raw materials on the synthesis of (Ni,Sb)-co-doped rutile pigment were *** results show that mechanical activation effectively decreased the crystallinity of the mixed precursors,thus enhancing their reactivity and the migration rate of *** effects lowered the temperature required for formation of the rutile *** with results from a mixture of separately ground precursors,the mixture of raw materials ground together was more effective for accelerating nickel/antimony ions doping into the TiO2structure and improved the color performance of the *** pigment from the mixed raw materials ground for 2.0h and heat-treated at 1100℃ could be used as an environmentally-friendly ceramic yellow pigment owing to its low-toxicity,bright yellow hue,good chemical/thermal durability, and high cost-effectiveness.

关键词： Mechanical activation Solid-state synthesis (Ni,Sb)-co-doped rutile Ceramic pigment

CasNet:A Cascade Coarse-to-Fine Network for Semantic Segmentation

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Tsinghua Science and Technology 2019年第2期24卷 207-215页

作者： Zhenyang Wang zhidong Deng Shiyao Wang Department of Computer Science Tsinghua University

Semantic segmentation is a fundamental topic in computer vision. Since it is required to make dense predictions for an entire image, a network can hardly achieve good performance on various kinds of scenes. In this paper, we propose a cascade coarse-to-fine network called CasNet, which focuses on regions that are difficult to make pixel-level labels. The CasNet comprises three branches. The first branch is designed to produce coarse predictions for easy-to-label pixel regions. The second one learns to distinguish the relatively difficult-to-label pixels from the entire image. Finally, the last branch generates final predictions by combining both the coarse and the fine prediction results through a weighting coefficient that is estimated by the second branch. Three branches focus on their own objectives and collaboratively learn to predict from coarse-to-fine predictions. To evaluate the performance of the proposed network, we conduct experiments on two public datasets: SIFT Flow and Stanford Background. We show that these three branches can be trained in an end-to-end manner, and the experimental results demonstrate that the proposed CasNet outperforms existing state-of-the-art models, and it achieves prediction accuracy of 91.6% and 89.7% on SIFT Flow and Standford Background, respectively.

关键词： semantic segmentation convolutional neural network hard negative mining

Molecular Short Range Correlations in Nematic Liquid Crystal Films

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Chinese Physics Letters 1995年第3期12卷 175-178页

作者： ZHANG zhidong YANG Guochen Department of Mathematics and Physics Hebei Institute of TechnologyTianjin 300130

A generalized functional variation theory of nematics is presented to take account of the local short range correlations between *** theory is used to study nematics liquid crystal *** nematics-isotropic transition temperature is *** orientational order parameter in each molecular layer and the internal energy per molecule associated with each layer are *** numerical results are compared with those of the Monte Carlo simulation and of the mean field theory.

关键词： theory. theory layer