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Journal of Systems Engineering and Electronics 2017年第5期28卷 986-995页

作者： Bo Zhou Kun qian Xudong Ma Xianzhong dai School of Automation Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education

A robust fault diagnosis approach is developed by incorporating a set-membership identification (SMI) method. A class of systems with linear models in the form of fault related parameters is investigated, with model uncertainties and parameter variations taken into account explicitly and treated as bounded errors. An ellipsoid bounding set-membership identification algorithm is proposed to propagate bounded uncertainties rigorously and the guaranteed feasible set of faults parameters enveloping true parameter values is given. Faults arised from abrupt parameter variations can be detected and isolated on-line by consistency check between predicted and observed parameter sets obtained in the identification procedure. The proposed approach provides the improved robustness with its ability to distinguish real faults from model uncertainties, which comes with the inherent guaranteed robustness of the set-membership framework. Efforts are also made in this work to balance between conservativeness and computation complexity of the overall algorithm. Simulation results for the mobile robot with several slipping faults scenarios demonstrate the correctness of the proposed approach for faults detection and isolation (FDI).

关键词： set-membership identification fault diagnosis fault detection and isolation (FDI) bounded error mobile robot

Stability evaluation of reference genes for real-time quantitative PCR normalization in Spodoptera frugiperda(Lepidoptera:Noctuidae)

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Journal of Integrative Agriculture 2021年第9期20卷 2471-2482页

作者： SHU Ben-shui YU Hai-kuo dai Jing-hua xie Zi-ge qian Wan-qiang LIN Jin-tian Guangzhou City Key Laboratory of Subtropical Fruit Trees Outbreak Control Zhongkai University of Agriculture and EngineeringGuangzhou 510225P.R.China Agricultural Genomics Institute at Shenzhen Chinese Academy of Agricultural SciencesShenzhen 518120P.R.China

Real-time quantitative PCR(qPCR)is a reliable and widely used technique for analyzing the expression profiles of target genes in different species,and reference genes with stable expressions have been introduced for the normalization of the ***,stability evaluation should be considered as the initial step for qPCR *** fall armyworm Spodoptera frugiperda(***)(Lepidoptera:Noctuidae)is a polyphagous pest that consumes many plant species and seriously threatens corn production around the ***,no studies thus far have examined the stability of reference genes in this *** this study,the expression profiles of the eight candidate reference genes of Actin,elongation factor 1 alpha(EF1α),elongation factor 2(EF2),glyceraldehyde-3-phosphate dehydrogenase(GAPDH),ribosomal protein L3(RPL3),ribosomal protein L13(RPL13),alpha-tubulin(α-TUB),and beta-1-tubulin(β-1-TUB)were obtained from *** in different samples and the stability was evaluated byΔCt,BestKeeper,geNorm,NormFinder,and RefFinder *** results of pairwise variation(V)calculated by GeNorm indicated two reference genes could be selected for ***,the combinations of the most stable reference genes for different experimental conditions of *** were shown as follows:EF2 and RPL13 for developmental stages,RPL3 andβ-1-TUB for larval tissue samples,EF2 and EF1αfor the larval samples treated with different temperatures,RPL3 and EF1αfor the larval samples under starvation stress,and RPL13 and EF1αfor all the *** results lay the foundation for the normalization of qPCR analyses in *** and could help guarantee the accuracy of subsequent research.

关键词： Spodoptera frugiperda reference genes qPCR stability evaluation different experimental conditions

Kinetics of forward extraction of Ti(IV) from H_2SO_4 medium by P_(507) in kerosene using the single drop technique

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Rare Metals 2011年第1期30卷 1-7页

作者： ZHU Ping HONG dai WU Jinhua qian Guangren College of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China

The kinetics of forward extraction of Ti（IV） from H2SO4 medium by P507 in kerosene has been investigated using the single drop *** the low concentration region of Ti（IV）,the rate of forward extraction at 298 K can be represented by F（kmol·m-2·s-1）=10-5.07 [TiO 2 ＋ ][H＋]-1 [NaHA 2 ]（o）·Analysis of the rate expression reveals that the rate determining step is（TiO）（i）2＋＋（HA 2）（i）-[TiO（HA2）]（i）＋.The values of Ea,H±,S±,and G±298 are calculated to be 22 kJ·mol-1,25 kJ·mol-1,-218 J·mol-1·K-1,and 25 kJ·mol-1,*** experimental negative S± values indicate that the reaction step occurs via SN2 mechanism.

关键词： titanium solvent extraction reaction kinetics activation energy enthalpy entropy

Stroke-GAN Painter:Learning to paint artworks using stroke-style generative adversarial networks

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Computational Visual Media 2023年第4期9卷 787-806页

作者： qian Wang Cai Guo Hong-Ning dai Ping Li School of Computer Science and Engineering Macao University of Science and TechnologyMacaoChina Department of Computing The Hong Kong Polytechnic UniversityHong KongChina School of Computing and Information Engineering Hanshan Normal UniversityChaozhouChina Department of Computer Science Hong Kong Baptist UniversityHong KongChina School of Design The Hong Kong Polytechnic UniversityHong KongChina

It is a challenging task to teach machines to paint like human artists in a stroke-by-stroke *** advances in stroke-based image rendering and deep learning-based image rendering,existing painting methods have limitations:they(i)lack flexibility to choose different art-style strokes,(ii)lose content details of images,and(iii)generate few artistic styles for *** this paper,we propose a stroke-style generative adversarial network,called Stroke-GAN,to solve the first two ***-GAN learns styles of strokes from different stroke-style datasets,so can produce diverse stroke *** design three players in Stroke-GAN to generate pure-color strokes close to human artists’strokes,thereby improving the quality of painted *** overcome the third limitation,we have devised a neural network named Stroke-GAN Painter,based on Stroke-GAN;it can generate different artistic styles of *** demonstrate that our artful painter can generate various styles of paintings while well-preserving content details(such as details of human faces and building textures)and retaining high fidelity to the input images.

关键词： AI painting painting strokes artistic style

Color and direction-invariant nonlocal self-similarity prior and its application to color image denoising

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Science China(Information Sciences) 2020年第12期63卷 87-103页

作者： Qi xie qian ZHAO Zongben XU Deyu MENG School of Mathematics and Statistics Xi'an Jiaotong University Macau Institute of Systems Engineering Macau University of Science and Technology

Nonlocal self-similarity(NSS) is one of the most commonly used priors in computer vision and image processing. It aims to make use of the fact that a natural image often possesses many repetitive local patterns, and thus a local image patch always has many similar patches across the image. Through compensatively integrating these similar image patches, their insightful patterns hiding under corrupted noises can be intrinsically extracted. However, for using this prior knowledge, current methods search the similar patches by using simple block matching strategy with Euclidean distance, which largely ignores those patches containing similar local patterns but with different texture-directions and colors. To more sufficiently explore similar patches over an image, in this paper, we propose two new representations for image patches, which facilitate an easy NSS prior for measuring direction-invariant and color-invariant nonlocal selfsimilarity possessed by image patches. Specifically, based on this prior term, we formulate the color image denoising problem as a concise Bayesian posterior estimation framework, and design an efficient expectationmaximization(EM) algorithm to solve it. A series of experiments implemented on simulated and real noisy color images demonstrate the superiority of the proposed method as compared with the state-of-the-arts both visually and quantitatively, verifying the potential usefulness of this new NSS prior.

关键词： color image denoising nonlocal self-similarity Gaussian mixture model maximum a posterior (MAP) model EM algorithm

Current research into the use of supercritical CO2 technology in shale gas exploitation

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International Journal of Mining Science and Technology 2019年第5期29卷 739-744页

作者： Wang Meng Huang Kai xie Weidong dai Xuguang School of Resources and Earth Science China University of Mining&TechnologyXuzhou 221116China Key Laboratory of Coalbed Methane Resource&Reservoir Formation Process Ministry of EducationChina University of Mining&TechnologyXuzhou 221008China College of Geology and Mining Engineering Xinjiang UniversityUrumqi 830046China

The use of supercritical CO2 for shale gas extraction is a promising new *** paper explores current research into this process,looking at analysis of the mechanism of CH4 displacement in nanoporous shale,the positive and negative effects accompanying its use for sequestration as well as organic extraction,the migration of elements and the swelling process,and the macro and micro control mechanisms involved in permeability enhancement in *** directions for future research are also considered through comparison with hydraulic *** research findings indicate that ScCO2 fluid replacement can be used to increase gas production and seal up greenhouse gases as an effective,clean and safe method of shale gas *** is particularly effective for promoting the desorption of CH4 in shale reservoirs that have developed fine neck-wide body pores,and the subtle structural changes effected by ScCO2 fluid in sensitive minerals in reservoirs with a high brittle mineral content also have a positive effect on permeability and storage *** adsorption process has been characterized as consisting of three stages:short-term shrinkage,slow swelling,and stability;an expansion equation has been proposed for CO2/CH4 that incorporates competitive adsorption,collision desorption,and impingement ***2 fracturing has been found to be more effective than hydraulic fracturing for dense reservoirs and more effective at linking up pore-micro-fissure-fracture systems.

关键词： Shale gas Supercritical CO2 Adsorption/desorption Physical properties Geological sequestration

Novel Bilayer-Shelled N,O-Doped Hollow Porous Carbon Microspheres as High Performance Anode for Potassium-Ion Hybrid Capacitors

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Nano-Micro Letters 2023年第9期15卷 423-435页

作者： Zhen Pan Yong qian Yang Li Xiaoning xie Ning Lin Yitai qian Department of Applied Chemistry University of Science and Technology of ChinaHefei 230026People’s Republic of China Yongjiang Laboratory Ningbo 315202People’s Republic of China China National Building Material Design&Research Institute Co. Ltd.No.208Huazhong RoadGongshu DistrictHangzhou 310022People’s Republic of China

With the advantages of high energy/power density,long cycling life and low cost,dual-carbon potassium ion hybrid capacitors(PIHCs)have great potential in the field of energy ***,a novel bilayer-shelled N,O-doped hollow porous carbon microspheres(NOHPC)anode has been prepared by a self-template method,which is consisted of a dense thin shell and a hollow porous spherical ***,the NOHPC anode possesses a high K-storage capacity of 325.9 mA h g^(−1)at 0.1 A g^(−1)and a capacity of 201.1 mAh g^(−1)at 5 A g^(−1)after 6000 *** combination with ex situ characterizations and density functional theory calculations,the high reversible capacity has been demonstrated to be attributed to the co-doping of N/O heteroatoms and porous structure improved K+adsorption and intercalation capabilities,and the stable long-cycling performance originating from the bilayer-shelled hollow porous carbon sphere ***,the hollow porous activated carbon microspheres(HPAC)cathode with a high specific surface area(1472.65 m^(2)g^(−1))deriving from etching NOHPC with KOH,contributing to a high electrochemical adsorption capacity of 71.2 mAh g^(−1)at 1 A g^(−1).Notably,the NOHPC//HPAC PIHC delivers a high energy density of 90.1 Wh kg^(−1)at a power density of 939.6 W kg^(−1)after 6000 consecutive charge-discharge cycles.

关键词： Self-template method Bilayer-shelled hollow porous structure N,O-doped carbon microspheres Dual-carbon potassium‐ion hybrid capacitor

Research on application of kyanite in plastic refractory

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Chinese Journal Of Geochemistry 2013年第3期32卷 326-330页

作者： ZHANG Wei MENG qian dai Wenyong Plibrico (Dalian) Industries Co.Ltd.

Effect of kyanite addition on properties of plastic refractories that based on Chinese calcined flint clay were investigated with the Chinese calcined flint clay as raw materials, aluminum sulfate and fireclay as binding systems. After 24 h curing after demoulding and another 24 h curing at 110 ℃, the specimens were heat-treated at 1000, 1300 and 1500℃ for 3 h, respectively. Thepermanent linear change, bulk density, modulus of rupture, clod crushing strength, thermal expansion coefficient and thermal shock resistance were examined. The results show that the shrinkage of plastic refractory decreased with increasing kyanite addition after heat-treated at 1000 and 1300℃ , and its expansivity increased with increasing kyanite addition after heat-treated at 1500 ℃. The strength can be increased when kyanite was added into the plastic refractory. The thermal expansion coefficient and the expansivity were increased, and the shrinkage can be reduced at high temperature when kyanite addition was more than 10%. On the condition of this experiment, the thermal shock resistance of plastic refractory was the best when kyanite addition is w(kyanite)=10%.

关键词：耐火可塑料蓝晶石应用加热处理耐火材料膨胀系数耐热冲击性粘土塑料

Review on Large Eddy Simulation of Turbulent Premixed Combustion in Tubes

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Journal of Thermal Science 2020年第4期29卷 853-867页

作者： LUO Gang dai Haidong dai Lingpeng qian Yunlou SHA Ce ZHANG Yuxiang WU Bingxin Zhejiang College of Security Technology Zhejiang 325016China WenZhou ChengAn Technology Co. Ltd.Zhejiang 325006China

This paper reviews the existing knowledge on the large eddy simulation(LES) of turbulent premixed combustion in empty tubes and obstructed tubes. From the view of model development in LES, this review comprehensively analyzes the development history and applicability of the important Sub-Grid Scale(SGS) viscosity models and SGS combustion models. LES is also used to combine flow and combustion models to reproduce industrial explosion including deflagration and detonation and the transition from deflagration to detonation(DDT). The discussion about models and applications presented here leads readers to understand the progress of LES in the explosion of tube and reveals the deficiencies in this area.

关键词： LES turbulent premixed combustion SGS models empty tube obstructed tube

Some studies on mechanics of continuous mediums viewed as differential manifolds

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 432-456页

作者： xie XiLin CHEN Yu SHI qian Department of Mechanics & Engineering Science Fudan University

The continuous mediums are divided into two kinds according to their geometrical configurations,the first one is related to Euclidian manifolds and the other one to Riemannian manifolds/surfaces in the point of view of the modern *** kinds of finite deformation theories with respect to Euclidian and Riemannian manifolds have been developed in the present *** kinds of theories include the definitions of initial and current physical and parametric configurations,deformation gradient tensors with properties,deformation descriptions,transport theories and governing equations of nature conservation *** essential property of the theory with respect to Euclidian manifolds is that the curvilinear coordinates corresponding to the current physical configurations include time explicitly through which the geometrically irregular and time varying physical configurations can be mapped in the diffeomorphism manner to the regular and fixed domains in the parametric *** is quite essential to the study of the relationships between geometries and *** theory with respect to Riemannian manifolds provides the systemic ideas and methods to study the deformations of continuous mediums whose geometrical configurations can be considered as general *** essential property of the theory with respect to Riemannian manifolds is that the thickness variation of a patch of continuous medium is represented by the surface density and its governing equation is rigorously *** some applications,wakes of cylinders with deformable boundaries on the plane,incompressible wakes of a circular cylinder on fixed surfaces and axisymmetric finite deformations of an elastic membrane are numerically studied.

关键词： continuous mediums finite deformation theories Euclidian and Riemannian manifolds intrinsic generalized Stokes for-mulas wakes of cylinders with deformable boundaries flows on surfaces finite amplitude vibrations of membranes fluiddynamics on deformable boundaries