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Theoretical Analysis of Crack Propagation Measurement for Brittle Materials Based on Virtual Principal Strain Field

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Acta Mechanica Solida Sinica 2022年第5期35卷 842-850页

作者： Liuning gu Xinxing Shao Department of Engineering Mechanics School of Civil EngineeringSoutheast UniversityNanjing211189China

The measurement of crack propagation is crucial for revealing the fracture mechanical properties of materials and *** on the virtual principal strain field and Steger’s algorithm,an accurate and automatic method has been proposed for measuring the geometric parameters of crack *** measured geometric parameters of crack propagation include the width,length,and tip location of each *** mechanism of the crack-induced virtual principal strain field and the effects of subset,step,and strain window size are analyzed and discussed *** effectiveness of the derived theoretical equations is verified by the simulation *** to the theoretical equations,it is determined that the distribution of the virtual principal strain field near the crack is similar to the grayscale distribution of the laser fringe image with optimized calculation *** are further conducted to validate the effectiveness of the derived *** the optimized calculation parameters,the minimum crack that can be measured is approximately 0.0362 pixel in the laboratory environment,while the measurement error of the crack width is less than 0.025 pixel for two-dimensional digital image correlation(DIC)and 0.020 pixel for three-dimensional DIC.

关键词： Crack propagation Brittle materials Digital image correlation Virtual principal strain Steger’s algorithm

A general methodology to measure the light-to-heat conversion efficiency of solid materials

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Light(Science & Applications) 2023年第6期12卷 1051-1060页

作者： Kai gu Haizheng Zhong Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systems School of Materials Sciences&EngineeringBeijing Institute of Technology100081 BeijingChina

Light-to-heat conversion has been intensively investigated due to the potential applications including photothermal therapy and solar energy *** a fundamental property of materials,accurate measurement of light-to-heat conversion efficiency(LHCE)is of vital importance in developing advanced materials for photothermal ***,we report a photothermal and electrothermal equivalence(PEE)method to measure the LHCE of solid materials by simulating the laser heating process with electric heating *** temperature evolution of samples during electric heating process was firstly measured,enabling us to derive the heat dissipation coefficient by performing a linear fitting at thermal *** LHCE of samples can be calculated under laser heating with the consideration of heat dissipation *** further discussed the effectiveness of assumptions by combining the theoretical analysis and experimental measurements,supporting the obtained small error within 5%and excellent *** method is versatile to measure the LHCE of inorganic nanocrystals,carbon-based materials and organic materials,indicating the applicability of a variety of materials.

关键词： solid versatile supporting

Progress and perspectives of neural tissue engineering

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Frontiers of Medicine 2015年第4期9卷 401-411页

作者： Xiaosong gu Jiangsu Key Laboratory of Neuroregeneration Co-innovation Center of Neuroregeneration Nantong University Nantong 226001 China

Traumatic injuries to the nervous system lead to a common clinical problem with a quite high incidence and affect the patient＇s quality of life. Based on a major challenge not yet addressed by current therapeutic interventions for these diseases, a novel promising field of neural tissue engineering has emerged, grown, and attracted increasing interest. This review provides a brief summary of the recent progress in the field, especially in combination with the research experience of the author＇s group. Several important aspects related to tissue engineered nerves, including the theory on their construction, translation into the clinic, improvements in fabrication technologies, and the formation of a regenerative environment, are delineated and discussed. Furthermore, potential research directions for the future development of neural tissue engineering are suggested.

关键词： nerve injury tissue engineering nerve gratFTs

Prospect Theory and the Newsvendor Problem with Mental Accounting

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Journal of Systems Science and Systems Engineering 2020年第5期29卷 525-536页

作者： Bojun gu Xiang Zhang School of Economics and Management Zhejiang Ocean UniversityZhoushan 316022China School of Management and Economics Beijing Institute of TechnologyBeijing 100081China Sustainable Development Research Institute for Economy and Society of Beijing Beijing 100081China

The manner in which economic outcomes are coded in a value function is critical because it has substantial influence on the evaluation of risky *** this paper,we formulate multiple mental accounts in a nonlinear value function and propose a newsvendor problem with mental accounting to predict and explain pull-to-center *** show that the distinctive predictions of the proposed model come from the value function with mental *** identify the individual and combined effects of loss aversion,risk aversion,and risk seeking on shaping newsvendor ordering *** work demonstrates that prospect theory can explain the decision bias and ordering behavior observed in newsvendor *** also provide some additional insights to explain the studies in the literature.

关键词： Prospect theory mental accounting newsvendor problem decision bias pull-to-center phenomenon

F-N curved surface method for establishing the integrated risk criteria of dam failure

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Science China(Technological Sciences) 2011年第3期54卷 597-602页

作者： gu ShengPing College of Water and Hydropower Engineering Hohai University Nanjing 210098 China

It is of great importance to establish the dam failure risk criteria for dam risk assessment and management. Presently, the F-N curve method is widely applied in practice, in which the F-N curves are used for establishing the criteria for separate risks caused by the dam failure in life, economy, environment, and society respectively. In this paper, in consideration of the overlying effect by two or more types of risk losses resulting from the dam failure at the same time, the F-N curved surface method is presented for establishing the integrated dam failure risk criteria. In this method, the named F-N curved surfaces are established, and by these curved surfaces, the acceptable, the allowable, and the unallowable integrated risk zones can be defined.

关键词： dam failure risk assessment separate risk criteria F-N curve method integrated risk criteria F-N curved surface method

Exact Vacuum Solutions to the Einstein Equation

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Chinese Annals of Mathematics,Series B 2007年第5期28卷 499-506页

作者： Yingqiu gu School of Mathematical Sciences Fudan University Shanghai 200433 China.

In this paper, the author presents a framework for getting a series of exact vacuum solutions to the Einstein equation. This procedure of resolution is based on a canonical form of the metric. According to this procedure, the Einstein equation can be reduced to some 2-dimensional Laplace-like equations or rotation and divergence equations, which are much convenient for the resolution.

关键词： Einstein equation Exact vacuum solution Canonical metric Black hole

Human Action Recognition Based on Supervised Class-Specific Dictionary Learning with Deep Convolutional Neural Network Features

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Computers, Materials & Continua 2020年第4期63卷 243-262页

作者： Binjie gu Key Laboratory of Advanced Process Control for Light Industry Ministry of EducationJiangnan UniversityWuxiChina National Engineering Laboratory for Cereal Fermentation Technology Jiangnan UniversityWuxiChinaWeili Xiong1Zhonghu Bai2

Human action recognition under complex environment is a challenging ***,sparse representation has achieved excellent results of dealing with human action recognition problem under different *** main idea of sparse representation classification is to construct a general classification scheme where the training samples of each class can be considered as the dictionary to express the query class,and the minimal reconstruction error indicates its corresponding ***,how to learn a discriminative dictionary is still a difficult *** this work,we make two ***,we build a new and robust human action recognition framework by combining one modified sparse classification model and deep convolutional neural network(CNN)***,we construct a novel classification model which consists of the representation-constrained term and the coefficients incoherence *** results on benchmark datasets show that our modified model can obtain competitive results in comparison to other state-of-the-art models.

关键词： Action recognition deep CNN features sparse model supervised dictionary learning

Exact Boundary Observability of Unsteady Supercritical Flows in a Tree-Like Network of Open Canals

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Chinese Annals of Mathematics,Series B 2010年第4期31卷 447-460页

作者： Qilong gu School of Mathematical Sciences Fudan University Shanghai 200433 China Laboratoire de Mathematiques CNRS UMR 6620 Universit@ Blaise Pascal （Clermont-Ferrand 2） 63177 Aubiere cedex France

The author establishes the exact boundary observability of unsteady supercritical flows in a tree-like network of open canals with general topology. An implicit duality between the exact boundary controllability and t... 详细信息

关键词： Exact boundary observability Saint-Venant system Tree-like network of open canals Quasilinear hyperbolic system

Design of stable covalent organic frameworks for transport regulation of mass and energy

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Science China Chemistry 2023年第12期66卷 3495-3505页

作者： Xianzhe Wei Cheng gu State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

This feature article discusses the design of stable covalent organic frameworks(COFs) for the transport regulation of protons,electrons, and radicals. Transporting these particles through materials is essential for many applications, and porous materials with high surface area and porosity have become powerful platforms for their development. However, the stability of the holes in the material is crucial for adjusting the transmission performance, which may change significantly when the material is not stable enough, and the structure changes when it is in service in the environment. Various strategies have been adopted to improve the stability of COFs, including introducing strong electron-donating groups into the COFs and introducing irreversible reactions into the COF synthesis process. The transport regulation in stable COFs has been explored, and the structure-function relationship has been established. The prospects and challenges of COFs for the transport regulation of protons, electrons, and radicals have also been discussed. Overall, the breakthroughs in COF field have opened new possibilities for developing advanced materials with improved transport properties. The stable COFs have potential applications in energy storage, catalysis,and sensing. However, further research is needed to understand the transport properties of COFs fully and to optimize their performance for specific applications.

关键词： covalent organic frameworks transport regulation stability