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Analysis of Reaction Force and Locomotor Behavior on Geckos in Time-and Frequency-domain during Climbing on Vertical Substrates

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Journal of Bionic Engineering 2019年第1期16卷 115-129页

作者： Qijun jiang Zhouyi Wang jun Zhou Weidong chen Zhendong Dai Institute of Bio-inspired Structure and Surface Engineering Nanjing University of Aeronauties and AstronauticsNanjing 210016China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Since the commencement of climbing robots,the moving ability of climbing robots has continuously lagged far behind that of climbing animal.A primary cause is the insufficient understanding of how animals govern their climbing *** reveal the mechanism of vertical locomotion and enhance the performance of climbing robots,we have measured the reaction forces acting on climbing geckos and recorded the locomotor behaviors *** coordinates of reference points were regressed to analyze kinematic feature ***,the data of reaction forces were further processed by fast Fourier transform and wavelet transform to acquire time-frequency domain *** results show a good agreement between the reaction forces and the locomotor behaviors in time-frequency domain;the main locomotor frequency of trunk in fore-aft direction is twice that in lateral direction;the excellent adhesion system of geckos enables them to climbing up vertical substrate with not onIy a very tiny impact in time scale but also not easily identifiable characteristics in *** research will help deepen our understanding of the climbing locomotion,and provide a more precise prototype for the design of gecko-like robot.

关键词： reaction force time-frequency domain analysis biomechanics gecko power spectral density

Effect of electrolyte concentration o n the tribological performance of MAO coatings on aluminum alloys

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 1065-1071页

作者： Chao Wang jun chen Jihua He Jing jiang Qinyong Zhang Clean Energy Materials and Engineering Center State Key Laboratory of Electronic Thin Film and Integrated DeviceSchool of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Materials Science and Engineering Xihua UniversityChengdu 610039China

Micro-arc oxidation(MAO)is an efficient approach to improve the hardness,wea r resistance,and other properties of aluminum *** order to investigate the effect of the electrolyte concentration on the properties of MAO coatings for LY12 alloy,the voltage variation during the MAO process was *** surface morphologies and phase compositions of the coatings produced with different electrolytes were investigated using scanning electron microscopy and X-ray diffraction,*** roughness and thickness of the coatings were measured using a pocket roughness meter a nd an eddy-current thickness meter,*** tribological performances of the coatings wer e investigated against GCr15 bearing steel on aball-on-disc wear tester in open *** results showed that with an increase in the Na2SiO3 content,the working voltage of the MAO process decreased,the roughness a nd thickness of the coatings increased significantly,a nd the relative content of the α-Al2O3 phase *** an increase in the KOH content,the working voltage decreased slightly,the roughness and thickness of the coatings increased slightly,and the α-and γ-Al2O3 phase contents remained *** friction coefficient and wear rate of the coatings increased with an increase in the Na2Sio3 and KoH concentrations.A decrease in the porosity and roughness and an increase in the α-Al2O3 content of the coatings reduced their wear mass loss.

关键词： aluminum alloy micro-arc oxidation coating electrolyte concentration tribological performance

A simplified model to predict blast response of CFST columns

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Journal of Central South University 2017年第3期24卷 683-691页

作者： ZHANG jun-hao chen Bin jiang Shi-yong Department of Civil Engineering Logistical Engineering University Chongqing 401311 China Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China

In order to study the dynamic response of concrete-filled steel tube(CFST) columns against blast loads,a simplified model is established utilizing the equivalent single-degree-of-freedom(SDOF) method,which considers the non-uniform distribution of blast loads on real column and the axial load-bending moment(P-M) interaction of CFST *** of the SDOF analysis compare well with the experimental data reported in open literature and the values from finite element modeling(FEM) using the program *** comparisons between the results of SDOF and FEM analysis show that the proposed model is effective to predict the dynamic response of CFST columns with different blast conditions and column ***,it is found that the maximum responses of the columns are overestimated when ignoring the non-uniformity of blast loads,and that neglecting the effect of P-M interaction underestimates the maximum response of the columns with large axial load ratio against close range *** proposed SDOF model can be used in the design of the blast-loaded CFST columns.

关键词： concrete-filled steel tube (CFST) columns dynamic response single-degree-of-freedom (SDOF) analysis non-uniformblast loads axial load-bending moment (P-M) interaction

ON BANDLIMITED SCALING FUNCTION

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Journal of Computational Mathematics 2002年第4期20卷 373-380页

作者： Wei chen Qiao Yang Wei-jun jiang Si-long Peng Insitute of Mathematics Academy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100080China Department of Mathematics Institute of Water Conservancy and Hydroelectric PowerZhengzhou 450045China Nadec Institute of AutomationChinese Academy of SciencesBeijing 100080China

This paper discuss band-limited scaling function, especially on the interval band case and three interval bands case, its relationship to oversampling property and weakly translation invariance are also studied. At th... 详细信息

关键词： scaling function oversampling property weakly translation invariance aliasing error

Inequalities for Eigenvalues of a System of Equations of Elliptic Operator in Weighted Divergence Form on Metric Measure Space

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Acta Mathematica Sinica,English Series 2020年第8期36卷 903-916页

作者： He jun SUN Da Guang chen Xu Yong jiang College of Science Nanjing University of Science and TechnologyNanjing 210094P.R.China Department of Mathematical Sciences Tsinghua UniversityBeijing 100086P.R.China

Let A be a symmetric and positive definite(1,1)tensor on a bounded domain Ω in an ndimensional metric measure space(R^n,,e^-φdv).In this paper,we investigate the Dirichlet eigenvalue problem of a system of equations of elliptic operators in weighted divergence form{LA,φu+α▽(divu)-▽φdivu]=-su,inΩ,u∣aΩ=0,where LA,φ=div(A▽(·))-(A▽φ,▽(·)),α is a nonnegative constant and u is a vector-valued *** universal inequalities for eigenvalues of this problem are ***,as applications of these results,we give some estimates for the upper bound of sk+1 and the gap of sk+1-sk in terms of the first k *** results contain some results for the Lam′e system and a system of equations of the drifting Laplacian.

关键词： Eigenvalue inequality elliptic operator in weighted divergence form metric measure space

The Consistency for the Estimators of Semiparametric Regression Model with Dependent Samples

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Acta Mathematicae Applicatae Sinica 2021年第2期37卷 299-318页

作者： Yi WU Xue-jun WANG Ling chen Kun jiang School of Big Data and Artificial Intelligence Chizhou UniversityChizhou 247000China School of Mathematical Sciences Anhui UniversityHefei 230601China

For the semiparametric regression model:Y^((j))(x_(in),t_(in))=t_(in)β+g(x_(in))+e^((j))(x_(in)),1≤j≤k,1≤i≤n,where t_(in)∈R and x(in)∈Rpare known to be nonrandom,g is an unknown continuous function on a compact set A in R^(p),e^(j)(x_(in))are m-extended negatively dependent random errors with mean zero,Y^((j))(x_(in),t_(in))represent the j-th response variables which are observable at points xin,*** this paper,we study the strong consistency,complete consistency and r-th(r>1)mean consistency for the estimatorsβ_(k,n)and g__(k,n)ofβand g,*** results obtained in this paper markedly improve and extend the corresponding ones for independent random variables,negatively associated random variables and other mixing random ***,we carry out a numerical simulation for our main results.

关键词： semiparametric regression model strong consistency complete consistency mean consistency m-END random variables

Deciphering the molecular mechanisms of Simiaowan in the treatment of hyperuricemia: in vivo and in silico approaches

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Traditional Medicine Research 2025年第2期10卷 37-54页

作者： Yong-Chang Zeng jun-Hong Wu Dan-Dan Xu Kang He Chang-Qing Liu Li-Fei Song Zheng-Zhi Wu Qian-Qian jiang Shao-Yu Liang Department of Neurology The First Affiliated Hospital of Shenzhen UniversityShenzhen 518020China Pharmaceutical Department The Affiliated TCM Hospital of Guangzhou Medical UniversityGuangzhou 510000China School of Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China Guangzhou Zeli Medical Technology Co. Ltd.Guangzhou 510700China

Background:Simiaowan(SMW),a well-known traditional Chinese medicine,has been employed to treat hyperuricemia(HUA)and gout for ***,the bioactive components and underlying mechanisms have not been *** objective of this study was to identify the active components and potential mechanisms of SMW by integrating pharmacological experimentation,serum pharmacochemistry,network pharmacology and molecular ***:HUA rats modelling by high-fat/high-sugar diet and potassium oxonate/adenine oral administration were used to evaluate the pharmacodynamic effects of ***-Q-Exactive-MS/MS was employed to detect the bioactive components present in SMW-containing *** pharmacology and molecular docking were utilized to elucidate the potential targets and underlying ***:SMW effectively ameliorated HUA rats via the inhibition of uric acid(UA)production,promotion of UA excretion,improvement of lipid and glucose metabolic abnormalities,antioxidant,anti-inflammatory and anti-insulin resistance effects.A total of 73 compounds detected in SMW-containing serum were identified as potential active components,with alkaloids,flavonoids,organic acids,and terpenoids emerging as the primary active *** 203 corresponding targets were obtained as SMW anti-HUA/gout targets,which mainly participated in apoptosis,insulin resistance,TNF,PI3K-Akt,HIF-1,NF-κB,MAPK,IL-17 and TLR signaling *** docking indicated that active compounds(***,phellodendrine,quercetin,formononetin,ferulic acid)had superior binding abilities to the key targets(*** carrier family 22 member 12(URAT1),solute carrier family 22 member 6(OAT1),ATP-binding cassette sub-family G member 2(ABCG2),solute carrier family 2,facilitated glucose transporter member 9(GLUT9),xanthine dehydrogenase/oxidase(XDH),transcription factor p65(RELA),toll-like receptor 4(TLR4),prostaglandin G/H synthase 2(PTGS2),caspase-3(CASP3),insulin(INS)).Conclusion:S

关键词： hyperuricemia network pharmacology serum pharmacochemistry Simiaowan UPLC-Q-Exactive-MS/MS

抗乙肝病毒表面抗原嵌合抗体基因在昆虫细胞中的表达

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生物化学与生物物理学报 1997年第5期29卷 41-46页

作者：余拥军陈亚华姜育蕾吴祥甫中国科学院上海生物化学研究所

应用杆状病毒表达系统在昆虫细胞中表达了抗乙肝病毒表面抗原（ＨＢｓＡｇ）人－鼠嵌合抗体重、轻链基因。鼠源单克隆抗体ＯＨ３重、轻链可变区（ＶＨ、ＶＬ）ｃＤＮＡ分别与人免疫球蛋白恒区γ３、κｃＤＮＡ拼接成人－鼠嵌合抗体基因... 详细信息

应用杆状病毒表达系统在昆虫细胞中表达了抗乙肝病毒表面抗原（ＨＢｓＡｇ）人－鼠嵌合抗体重、轻链基因。鼠源单克隆抗体ＯＨ３重、轻链可变区（ＶＨ、ＶＬ）ｃＤＮＡ分别与人免疫球蛋白恒区γ３、κｃＤＮＡ拼接成人－鼠嵌合抗体基因。含嵌合抗体基因的转移载体与线性化病毒ＤＮＡ共转染Ｓｆ９细胞，并通过点杂交、ＰＣＲ扩增和Ｓｏｕｔｈｅｒｎｂｌｏｔ分析获得重组病毒。Ｗｅｓｔｅｒｎｂｌｏｔ和竞争ＥＬＩＳＡ表明以重组病毒感染的昆虫细胞分别表达了嵌合重链和轻链，并证实表达的嵌合重链和轻链兼有结合ＨＢｓＡｇ的特性。

关键词：抗HBsAg抗体嵌合基因重链轻链杆状病毒表达系统

Neural 3D reconstruction from sparse views using geometric priors

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Computational Visual Media 2023年第4期9卷 687-697页

作者： Tai-jiang Mu Hao-Xiang chen jun-Xiong Cai Ning Guo BNRist Department of Computer Science and TechnologyTsinghua UniversityBeijing 100084China Academy of Military Sciences Beijing 100091China

Sparse view 3D reconstruction has attracted increasing attention with the development of neural implicit 3D *** methods usually only make use of 2D views,requiring a dense set of input views for accurate 3D *** this paper,we show that accurate 3D reconstruction can be achieved by incorporating geometric priors into neural implicit 3D *** method adopts the signed distance function as the 3D representation,and learns a generalizable 3D surface reconstruction model from sparse ***,we build a more effective and sparse feature volume from the input views by using corresponding depth maps,which can be provided by depth sensors or directly predicted from the input *** recover better geometric details by imposing both depth and surface normal constraints in addition to the color loss when training the neural implicit 3D *** demonstrate that our method both outperforms state-of-the-art approaches,and achieves good generalizability.

关键词： sparse views 3D reconstruction volume rendering geometric priors neural implicit 3D representation