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영어학
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A study on price-determinants for Knowledge Industry Center
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성서학연구원심포지움
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Levels of serum Immunomodulators and its alteration with electroconvulsive therapy in treatment resistant depression
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A Study on the Application of Phase Change Material for Electric Vehicle Battery Thermal Management System using Dymola
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케냐프/레이온 혼방 직물의 특성에 관한 연구
- 검색키워드
- 저자 : A. A. Javadi (검색결과 5 건)
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Applications of artificial intelligence and data mining techniques in soil modeling
Javadi, A.A.,Rezania, M. Techno-Press 2009 Geomechanics & engineering Vol.1 No.1
In recent years, several computer-aided pattern recognition and data mining techniques have been developed for modeling of soil behavior. The main idea behind a pattern recognition system is that it learns adaptively from experience and is able to provide predictions for new cases. Artificial neural networks are the most widely used pattern recognition methods that have been utilized to model soil behavior. Recently, the authors have pioneered the application of genetic programming (GP) and evolutionary polynomial regression (EPR) techniques for modeling of soils and a number of other geotechnical applications. The paper reviews applications of pattern recognition and data mining systems in geotechnical engineering with particular reference to constitutive modeling of soils. It covers applications of artificial neural network, genetic programming and evolutionary programming approaches for soil modeling. It is suggested that these systems could be developed as efficient tools for modeling of soils and analysis of geotechnical engineering problems, especially for cases where the behavior is too complex and conventional models are unable to effectively describe various aspects of the behavior. It is also recognized that these techniques are complementary to conventional soil models rather than a substitute to them.
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Effect of suction on volume change and shear behaviour of an overconsolidated unsaturated silty soil
Estabragh, A.R.,Javadi, A.A. Techno-Press 2012 Geomechanics & engineering Vol.4 No.1
This paper presents the results of an experimental study on the effect of suction on compressibility and shear behaviour of unsaturated silty soil under various types of loading. A series of laboratory experiments were conducted in a double-walled triaxial cell on samples of a compacted silty soil. In the experiments the soil samples were subjected to isotropic consolidation followed by unloading and subsequent reloading under constant suction and prescribed overconsolidated ratio. The experimental results are presented in the context of an elasto-plastic model for unsaturated soil. The effects of suction on mechanical behaviour of unsaturated silty soil are presented and discussed. It is shown that increasing suction affects the shear behaviour of unsaturated soils, but there is a limit beyond which, further increase in suction will not result in any significant change in the behaviour.
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M. Javadi,A. Heidari,S. Darbari 한국물리학회 2018 Current Applied Physics Vol.18 No.4
Triboelectric nanogenerators have been emerged as the most promising mechanical energy harvesters, during last few years. Here, a sonic triboelectric nanogenerator with 7-fold enhanced output power is reported, in which carbon nanotubes are utilized to increase the electrode's effective surface area. To improve the efficiency we have taken advantage of acoustic wave localization in a sonic array. For this purpose, first we have studied an array of periodic acoustic scatterers by simulation. Then, we have designed a 1-D phononic crystal consisting of five steel slabs standing in air medium, which leads to resonance of incident acoustic wave at f = 4.34 kHz. We implemented the design, but replaced the middle scatterer by triboelectric nanogenerator. An enhancement factor of about 4 has been measured for the output voltage of the sonic nanogenerator at f = 4.24 kHz, when it is embedded in the sonic array. Also, power enhancement factor of 7-fold has been achieved (Pout≈4 μW/m2), benefiting from the applied sonic cavity. The measured resonance frequency and enhancement factor are in acceptable agreement with the simulation results. The presented enhanced energy harvesting configuration proposes a compact and low cost structure, which allows parallel energy harvesting, and seems promising for realizing sonic harvesters.
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Model Tests on Reinforced Sloped Embankment with Denti-strip Inclusions under Monotonic Loading
M. X. Zhang,C. C. Qiu,A. A. Javadi,S. L. Zhang 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5
Denti-strip inclusion is a new type reinforcement that consists of conventional strip type reinforcement and vertical inclusionswhich are installed on the strip in spacing. A series of laboratory model tests were carried out on a physical model of reinforcedsloped embankment with strip inclusions and denti-strip inclusions under surcharge. Compared with strip reinforcement, it is foundthat due to the existence of vertical reinforcing elements which provided passive resistances against shearing and enhanced soilstrength, denti-strip inclusions are more effective in improving the ultimate surcharge, reducing the settlement and restricting thelateral displacement of the slope. Furthermore, the shear bands in the embankment reinforced with two-layer inclusions under thecondition without cutting of reinforcements are separated into several discontinuous arc bands by the inclusions unlike the singlecontinuous arc in unreinforced embankment; the inclination angles of the shear bands are greater than that of unreinforcedembankment and the position of the lower arc is close to the mid-height of embankment.
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