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Acoustomechanical constitutive theory for soft materials

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Acta Mechanica Sinica 2016年第5期32卷 828-840页

作者： Fengxian Xin tian jian Lu State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University MOE Key Laboratory for Multifunctional Materials and Structures Xi’an Jiaotong University

Acoustic wave propagation from surrounding medium into a soft material can generate acoustic radiation stress due to acoustic momentum transfer inside the medium and material, as well as at the interface between the two. To analyze acoustic-induced deformation of soft materials, we establish an acoustomechanical constitutive theory by combining the acoustic radiation stress theory and the nonlinear elasticity theory for soft materials. The acoustic radiation stress tensor is formulated by time averaging the momentum equation of particle motion, which is then introduced into the nonlinear elasticity constitutive relation to construct the acoustomechanical constitutive theory for soft *** a specified case of soft material sheet subjected to two counter-propagating acoustic waves, we demonstrate the nonlinear large deformation of the soft material and analyze the interaction between acoustic waves and material deformation under the conditions of total reflection, acoustic transparency, and acoustic mismatch.

关键词： Acoustomechanical constitutive theory Acoustic radiation stress Soft material

Superlinear Elliptic Equation with Mixed Boundary Value in Annular Domain

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Acta Mathematica Sinica,English Series 2021年第10期37卷 1549-1559页

作者： jian tian Yuan Hong WEI School of Mathematics Jilin UniversityChangchun 130012P.R.China

In this paper,we study superlinear elliptic equations with mixed boundary value conditions in annular *** is assumed that the nonlinearities depend on the derivative *** results about existence of solutions are establ... 详细信息

关键词： Mixed boundary value annular domain radial solution gradient term iterative method

A comparative survey of SSVEP recognition algorithms based on template matching of training trials

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International Journal of Intelligent Computing and Cybernetics 2023年第1期16卷 46-67页

作者： tian-jian Luo College of Computer and Cyber Security Fujian Normal UniversityFuzhouChina Digital Fujian Internet-of-Thing Laboratory of Environmental Monitoring Fujian Normal UniversityFuzhouChina

Purpose-Steady-state visual evoked potential(SSVEP)has been widely used in the application of electroencephalogram(EEG)based non-invasive brain computer interface(BCI)due to its characteristics of high accuracy and information transfer rate(ITR).To recognize the SSVEP components in collected EEG trials,a lot of recognition algorithms based on template matching of training trials have been proposed and applied in recent *** this paper,a comparative survey of SSVEP recognition algorithms based on template matching of training trails has been ***/methodology/approach-To survey and compare the recently proposed recognition algorithms for SSVEP,this paper regarded the conventional canonical correlated analysis(CCA)as the baseline,and selected individual template CCA(ITCCA),multi-set CCA(MsetCCA),task related component analysis(TRCA),latent common source extraction(LCSE)and a sum of squared correlation(SSCOR)for ***-For the horizontal comparative of the six surveyed recognition algorithms,this paper adopted the“Tsinghua JFPM-SSVEP”data set and compared the average recognition performance on such data *** comparative contents including:recognition accuracy,ITR,correlated coefficient and R-square values under different time duration of the SSVEP stimulus *** on the optimal time duration of stimulus presentation,the author has also compared the efficiency of the six compared *** measure the influence of different parameters,the number of training trials,the number of electrodes and the usage of filter bank preprocessing were compared in the ablation ***/value-Based on the comparative results,this paper analyzed the advantages and disadvantages of the six compared SSVEP recognition algorithms by considering application scenes,realtime and computational ***,the author gives the algorithms selection range for the recognition of real-world online SSVEP-BCI.

关键词： Non-invasive brain-computer interface EEG signals Template matching of training trials Steadystate visual evoked potential Optimal projection vector

Optimal Risk Sharing for Maxmin Choquet Expected Utility Model

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 430-444页

作者： De-jian tian Shang-ri WU School of Mathematics China University of Mining and TechnologyXuzhou 221116China

This article analyzes the Pareto optimal allocations,agreeable trades and agreeable bets under the maxmin Choquet expected utility(MCEU)*** provide several useful characterizations for Pareto optimal allocations for risk averse *** derive the formulation descriptions for non-existence agreeable trades or agreeable bets for risk neutral *** build some relationships between ex-ante stage and interim stage on agreeable trades or bets when new information arrives.

关键词： maxmin Choquet expected utility model Pareto optimal allocation agreeable trade agreeable bet

Force-position collaborative optimization of rope-driven snake manipulator for capturing non-cooperative space targets

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Chinese Journal of Aeronautics 2024年第9期37卷 369-384页

作者： Xiaofeng LI jian tian Cheng WEI Xibin CAO School of Astronautics Harbin Institute of TechnologyHarbin 150001China Beijing Instiuteof Spacecraft System Engineering China Academy of Space TechnolgyBeijing 100094Chia

With the rapid development of space activities,non-cooperative space targets increase swiftly,such as failed satellites and upper stages,threating normal spacecrafts *** there are some problems in the capture process,such as excessive collision and fast tumbling of targets,manipulator with redundant Degrees of Freedom(DOFs)can be used to improve the compliance and therefore solve these *** Rope-Driven Snake Manipulator(RDSM)is a combina-tion of hyper-redundant DOFs and better compliance,and therefore it is suitable for capturing *** this paper,a snake manipulator mechanism is designed,and the complete kinematic model and system dynamic model considering RDSM,target and contact is ***,to obtain the configuration of joint with hyper-redundant DOFs,an improved motion dexterity index is pro-posed as the joint motion optimization ***,the force-position collaborative optimization index is designed to adjust active stiffness,and the impedance control method based on the modified index is used to capture the space ***,the proposed force-position collaborative opti-mization method is verified by virtual prototype *** results demonstrate that based on the proposed method,the collision force is reduced by about 25%compared to normal impe-dance control,showing higher safety.

关键词： Capturing non-cooperative spacetargets Rope-driven snakemanipu-lator Force-position collaborative optimization Redundant degrees of free-dom Active stiffness adjustment

Anisotropic nanostructure ZnO photoelectrodes for CdS/CdSe quantum dot sensitized solar cells

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Anisotropic nanostructure ZnO photoelectrodes for CdS/CdSe q...

Synergistic Antiflaming of Expandable Graphite on the Sealing Silicone Rubber

第八届中国功能材料及其应用学术会议

作者： tian jian-jun Advanced Material and Technology Institute University of Science and Technology

ISBN: (纸本)9783037859698

CdS/CdSe quantum dots co-sensitized solar cells(QDSCs) were prepared by combining the successive ion layer absorption and reaction(SILAR)method and chemical bath deposition(CBD) method for the fabrication of CdS and CdSe quantum dots,*** this work,we designed anisotropic nanostructure ZnO photoelectrodes,such as nanorods/nanosheets and nanorods array,for CdS/CdSe quantum dots co-sensitized solar *** study revealed that the performance of QDSCs could be improved by modifying surface of ZnO to increase the loading of quantum dots and reduce the charge recombination.

关键词： quantum dot sensitized solar cell ZnO nanostructure CdS/CdSe

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cnki会议

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Journal of Wuhan University of Technology(Materials Science) 2013年第4期28卷 706-709页

作者：王红宇 tian jian Clean Energy Technology Laboratory Changchun University of Science and Technology School of Science and Engineering on Communications Jilin Jianzhu University

To study the effects of different proportions of aluminum hydroxide and expandable graphite （EG） composites on flame retardation, sealing, mechanical, electrical and other properties of RTV- 1, aluminum hydroxide/expandable graphite （ATH/EG） and silicone rubber composites were prepared by the compression molding method. The experimental results show that heat resistance improves with the increase of proportion of EG. Although the resistance coefficient changes, the composite materials still keep good electrical insulating property. Moreover, oxygen index and expansion index rise first then fall. When ATH/EG is 1：1, the oxygen index reaches the highest; the mechanical property of the silicone rubber is not affected under various environments such as acid, alkali, oily, artificial sea water environments, etc.

关键词： silicone rubber ATH EG halogen-free flame retardant expansive sealing

Petrogenesis and Tectonic Implications of the Late Silurian–Early Devonian Bimodal Intrusive Rocks in the Central Beishan Orogenic Belt,NW China:Constraints by Petrology,Geochemistry and Hf Isotope

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Journal of Earth Science 2023年第2期34卷 431-443页

作者： jian tian Hou-tian Xin Xue-jian Teng Min Li Qun-An Liao Yong Zhang Bang-Fang Ren tianjin Center China Geological SurveyTianjin 300170China Shenyang Center China Geological SurveyShenyang 110086China School of Earth Sciences China University of GeosciencesWuhan 430074China

A large number of Late Silurian–Early Devonian intrusive rocks are distributed in the central Beishan orogenic belt(BOB).Tectonic setting of these intrusive rocks is of great significance to the study of the subduction and accretion of the Paleo-Asian *** studies show that most of the intrusive rocks in this region are S-type or A-type *** this study,we firstly reported the Late Silurian–Early Devoniandia bases,granodiorites on the southside of the Baiyunshan ophiolitic mélanges belt,as a part of Hongliuhe-Xichangjing ophiolitic mélanges belt(HXOMB).Zircon LA-ICP-MS U-Pb dating yields emplacement ages between 418 and 397 Ma,REE distribution patterns exhibit enriched LREE and flat HREE in the diabases,the discriminant diagrams show that the diabases have geochemical characteristics of intraplate *** granodiorites in this paper present more like S-and A-type granitoids reported,showing the geochemical characteristics of syn/post-collision ***,the bimodal magmatic rocks are developed during Late Silurian–Early Devonian on both sides of the HXOMB,which are related to the tectonic background of the post orogeny *** diabases are tholeiitic with relative strong depletedεHf(t)(+8.1 to+13.0),which are mainly from relative depleted *** granodiorites are calc-alkaline with relative slightly depletedεHf(t)(+0.7 to+5.6)and the lower Mg#and MgO contents(34.6–36.9,0.50 wt.%–1.19 wt.%respectively),reflecting the source characteristics of ***,the remelting of juvenile crust may be the main way of continental crust accretion during Late Silurian–Early Devonian in the central BOB.

关键词： Beishan orogenic belt ophiolitic mélanges belt Late Silurian–Early Devonian bimodal intrusive rocks extension geochemistry

Stacking of Exfoliated Two-Dimensional Materials: A Review

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Chinese Journal of Chemistry 2020年第9期38卷 981-995页

作者： Zhen Hu Zhi-Bo Liu jian-Guo tian The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducotionTEDA Applied Physics Institute ond School of PhysicsNankai University Tianjin 300071China Renewable Energy Conversion and Storage Center Nankai UniversityTionjin 300384China

In recent years,two-dimensfonal(2D)atomic crystals represented by graphene have opened up new fields of 2D *** materials with atomic layer thickness are self-assembled into van der Waals heterostructures by weak van der Waals forces without considering lattice *** der Waals heterostructures can not only enhance the performance of its constituent materials but also show new ***-quality heterostructures require mechanically cleaved intrinsic 2D materials and flexible 2D material stacking ***,we summarize in detail the reliable exfoliation methods for large-area single-layer 2D materials and the dry and wet stacking techniques with high success *** twisted bilayer graphene is used as an example to briefly introduce the single-crystal tearing method,which is currently the most practical method for preparing isotropic twisted heterostructures with high-precision rotation *** hope to provide a valuable reference for researchers of 2D materials.

关键词： twisted preparing method