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Comparative analysis of monetary and emergy dimension methods in calculating the payback period of photovoltaic (PV) curtain wall

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Energy Education Science and Technology Part A: Energy Science and Research 2014年第5期32卷 3269-3276页

作者： Ding, Likui Tang, Jian Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People’s Republic of China Guangzhou Guangdong China

In this study, method of monetary dimension considering the energy consumption difference and without considering the energy consumption difference are used to calculate the payback period of PV curtain wall;Besides the emergy dimension method is also introduced to calculate the payback period. An example is studied by the above methods. Comparative analysis shows that the payback period of PV curtain wall calculated by the monetary dimension method considering the energy consumption difference is shorter than that does not consider the energy consumption difference. Among them the payback period of PV curtain wall calculated by the method of emergy dimension is the shortest. The main reason for this is that the emergy dimension method analyzes an ideal condition which doesn’t include human factors while those factors exist in monetary dimension method. Taking the energy consumption difference into consideration in the calculation of the payback period of PV curtain wall makes the calculation more scientific, and the emergy dimension analysis illustrates the broad prospects for the development of PV curtain wall. © Sila Science. All rights reserved.

关键词： Energy utilization

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Molecular dynamic simulation of the mechanical properties of PI/SIO2 nanocomposite based on materials studio

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Journal of Chemical and Pharmaceutical Research 2014年第6期6卷 1534-1539页

作者： Mo, Yuzhen Zhang, Hui Xu, Jiachu Department of Mechanics and Civil Engineering Jinan University Guangzhou China Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Jinan University Guangzhou China

The initial unit cell models of PI/SiO2Nanocomposite and pure polyimide were built by Materials Studio, the stiffness matrix and mechanical parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio of the unit cells were achieved after molecular dynamic (MD) optimizations and calculations. Finally, the mechanical properties of pure polyimide and the PI/SiO2 nanocomposite with 5vol.% and 10vol.% nanosilica were compared. The result shows that the mechanical properties of polyimide can be remarkably reinforced by being filled with a low volume faction of silica-nanoparticle. © 2014, Journal of Chemical and Pharmaceutical Research. All rights reserved.

关键词： Nanocomposites

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Matrix of the Covariance of Unit Impulse Response Function for time-frequency damage detection and monitoring 9

Matrix of the Covariance of Unit Impulse Response Function f...

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9th International Conference on Structural Dynamics (EURODYN)

作者： Li, X. Y. Wang, L. X. Jinan Univ Minist Educ China Dept Mech & Civil Engn Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Earthquake Adm Guangdong Prov Guangzhou 510070 Guangdong Peoples R China

ISBN: (纸本)9789727521654

A new covariance matrix is formulated from the impulse response function of the acceleration responses of a structure under general excitation. The components of the covariance matrix are proved to be functions of the modal parameters (modal frequency, mode shape and damping parameter) of a structure. Information from all the vibration modes of the structure limited by the sampling frequency contributes to these components. This contains more structural information than other parameters obtained from existing methods. The error produced in the modal extraction procedure is also avoided. A new damage index vector is proposed based on the components of the covariance matrix. A simply supported thirty-one bar plane truss structure is numerically studied. Damage location and damage quantification are investigated separately using the proposed damage index vector. A pattern assurance criterion is used to analyze the covariance data, and multiple rounds of computation are performed to reduce the candidate set of elements in a strategy to search for the damage location of the structure. An optimization technique is adopted to determine further the damage location and extent with good accuracy. Single damage scenarios with different noise levels are studied with satisfactory results.

关键词： Impulse response function Damage identification Inverse problem Covariance

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CONTACT ANALYSIS FOR FIBER-REINFORCED, DELAMINATED LAMINATES WITH KINEMATIC NONLINEARITY

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Acta Mechanica Solida Sinica 2013年第4期26卷 388-402页

作者： Jianghong Xue Li Zi Hong Yuan Renhuai Liu Department of Mechanics and Civil Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education

A macro-micro analytical approach for the anti-penetrating contact problem at the interfaces of the delamination in symmetrically cross-plied,fiber-reinforced rectangular laminates is presented in this *** laminate is simply supported and subjected to a uniform transverse load with a through-width delamination buried at the center position.A contact factor is defined to characterize the contact effect and determined using the micro-mechanics of composite *** analyzing the kinematics of nonlinear deformation at the interfaces of the delamination,the contact force is *** solutions from perturbation analysis are *** is found that the deformation of the laminate involves a global deflection and a local *** antipenetrating contact effects are characterized by the local buckling and are intrinsic properties of the laminates,relying only on the geometries of the delamination and the material *** analyses show that the location and size of the contact areas and the distribution of the contact force are hardly affected by the aspect ratio.

关键词： rectangular laminate delamination contact effect perturbation approach nonlinear analysis

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Fiber pullout with stress transfer and fracture propagation

Fiber pullout with stress transfer and fracture propagation

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2014 International Conference on Industrial,Mechanical and Manufacturing Science(ICIMMS 2014)

作者： J.Y.Wu H.Yuan H.W.Gu MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan University

In this paper,a nonlinear fracture mechanics approach has been introduced to derive theoretical solutions for the shear stress transfer and crack propagation along the interface of the pull-pull and pull-push fiber-matrix pullout model by using the assumed bilinear local bond-slip *** for the maximum load,shear stress and crack propagation along fiber-matrix interface are derived ***,numerical simulations are conducted to discuss the factors influencing the interfacial *** this paper emphasizes on fiber-matrix pullout test,the analytical solution is equally applicable to similar test between spindly bars of other materials and concrete.

关键词： crack propagation FRP interfacial mechanics fracture mechanics

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Kirigami-based stretchable lithium-ion batteries

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SCIENTIFIC REPORTS 2015年第1期5卷 10988-10988页

作者： Song, Zeming Wang, Xu Lv, Cheng An, Yonghao Liang, Mengbing Ma, Teng He, David Zheng, Ying-Jie Huang, Shi-Qing Yu, Hongyu Jiang, Hanqing Arizona State Univ Sch Engn Matter Transport & Energy Tempe AZ 85287 USA Desert Vista High Sch Phoenix AZ 85048 USA Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Arizona State Univ Sch Elect Comp & Energy Engn Tempe AZ 85287 USA Arizona State Univ Sch Earth & Space Explorat Tempe AZ 85287 USA

We have produced stretchable lithium-ion batteries (LIBs) using the concept of kirigami, i.e., a combination of folding and cutting. The designated kirigami patterns have been discovered and implemented to achieve great stretchability (over 150%) to LIBs that are produced by standardized battery manufacturing. It is shown that fracture due to cutting and folding is suppressed by plastic rolling, which provides kirigami LIBs excellent electrochemical and mechanical characteristics. The kirigami LIBs have demonstrated the capability to be integrated and power a smart watch, which may disruptively impact the field of wearable electronics by offering extra physical and functionality design spaces.

关键词： LITHIUM-ion batteries ROLLING (Metalwork) FRACTURE mechanics ELECTROCHEMICAL analysis MECHANICAL properties of metals WEARABLE technology SMARTWATCHES

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MACRO-MICRO ANALYSIS FOR ANTI-PENETRATING POSTBUCKLING OF FIBER REINFORCED, DEBONED LAMINATES WITH CONTACT EFFECTS

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INTERNATIONAL JOURNAL OF APPLIED MECHANICS 2014年第4期6卷 np页

作者： Tang, Mingqiao Xue, Jianghong Yuan, Hong Liu, Renhuai Jinan Univ Dept Mech & Civil Engn Key Lab Disaster Forecast & Control Engn Minist Educ Guangzhou 510632 Guangdong Peoples R China

This paper presents a close-form solution for the anti-penetrating postbuckling problem of fiber reinforced, rectangular laminates. The laminate has a through-width debonded region buried at the center position and is simply supported at its four edges subjected to the in-plane compressive load. Based on the previous analysis of the contact kinematics from micro mechanics of composite material, the nonlinear contact effects at the interfaces of the debonded region are considered and characterized by a contact factor. Governing equations are established and are solved using the perturbation approach. Asymptotic solutions from perturbation analysis are presented. It is found that for fiber reinforced, debonded laminates the postbuckling deformation involves global deflection and local buckling with amplitude of the global one 104 times larger than the local one. The global deflection is induced by the postbuckling load and the local buckling is caused by the anti-penetrating contact effects. Due to the contact effects, the load carry capacity of the delaminated laminate is tremendously enhanced. Further examination indicates that both the buckling load and the contact performances are intrinsic properties of the laminates. Parametric analyses show that (i) the buckling load decreases with the increasing of the delamination length and the delamination depth and is very sensitive to the changing of the aspect ratio, (ii) the contact performances, including the location and size of the contact areas, rely only on the geometries of the debonded region and the material properties but are hardly affected by the aspect ratio. The analysis is in effect by comparing with the well established results.

关键词： Macro-micro analyses delamination contact effect perturbation approach anti-penetrating postbuckling

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Experimental Research on Creep Characteristics of Nansha Soft Soil

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SCIENTIFIC WORLD JOURNAL 2014年第1期2014卷 968738-968738页

作者： Luo, Qingzi Chen, Xiaoping Jinan Univ Coll Sci & Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

A series of tests were performed to investigate the creep characteristics of soil in interactive marine and terrestrial deposit of Pearl River Delta. The secondary consolidation test results show that the influence of consolidation pressure on coefficient of secondary consolidation is conditional, which is decided by the consolidation state. The ratio of coefficient of secondary consolidation and coefficient of compressibility (C-a/C-c) is almost a constant, and the value is 0.03. In the shear-box test, the direct sheer creep failure of soil is mainly controlled by shear stress rather than the accumulation of shear strain. The triaxial creep features are closely associated with the drainage conditions, and consolidation can weaken the effect of creep. When the soft soil has triaxial creep damage, the strain rate will increase sharply.

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Research on Preparation of Concrete by Sea Sand

Research on Preparation of Concrete by Sea Sand

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2012 2nd International Conference on Smart Materials and Nanotechnology in engineering(SMNE 2012)

作者： Dong OuYang Xiaowei OuYang Bo Ning Xilian Wen Yanli Lin MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Materials Science and Engineering Jinan University Guangzhou Residential Construction Development CO. LTD

The effects of fine aggregates on the performance of cement mortar was studied, and using sea sand as fine aggregates to prepared high-performance concrete, relative experimental studies on the workability, mechanical properties and durability are respectively carried outThe results showed that the compressive strength of cement mortar made by sea sand is smaller than river sand, but higher than river sand on flexural strengthThe workability,28 d compressive strength and splitting tensile strength of concrete made by sea sand are excellent than river sand, and the rate of early strength developed rapidlyThe resistance to penetration of chloride ions into sea sand concrete tested by ASTM C1202 and NEL, have reached a evaluation standard of "very low".

关键词： Sea sand High-performance concrete Mechanical properties Durability

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Mechanical behavior and failure mode of woven carbon/epoxy laminate composites under dynamic compressive loading

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COMPOSITES PART B-engineering 2014年 60卷 531-536页

作者： Song, ZhenHua Wang, ZhiHua Ma, HongWei Xuan, HaiJun Jinan Univ Coll Sci & Engn Guangzhou 510632 Guangdong Peoples R China Taiyuan Univ Technol Inst Appl Mech & Biomed Engn Taiyuan 030024 Peoples R China Jinan Univ Minist Educ Peoples Republ China Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Zhejiang Univ Inst Chem Machinery High Speed Rotating Machinery Lab Hangzhou 310027 Peoples R China

The compressive behavior of woven carbon/epoxy laminate composites is investigated under in-plane and out-of-plane loading. The Material Testing System (MTS) and the Split Hopkinson Pressure Bar (SHPB) are employed to test the quasi-static and high strain rate dynamic mechanical properties of the material, respectively. Dynamic compression properties are compared with those of static loading. It is observed that the failure strength varies with different fiber woven directions. The results indicate that the stress-strain curves, maximum compressive stress and strain all evolve as strain rate varies. The specimens are mainly damaged in shear failure mode under out-of plane loading and the shear failure mode is independent of loading states and strain rates (500-1000/s). Comparatively, the different failure mechanisms of the material between quasi-static and dynamic in-plane loading at strain rates ranging from 50 to 400/s are obtained and studied. Delamination is only found at high strain rates under in-plane dynamical loading while shear deformation and delamination are both found under in-plane quasi-static loading. Shear bands and deformation zones are also observed under in-plane quasi-static loading. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Carbon fibre Mechanical properties Delamination Mechanical testing SHPB

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