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Search Results: 1 - 10 of 10724 matches for " Vasile Mu?at "
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Beam Elements on Linear Variable Two-Parameter Elastic Foundation
Iancu-Bogdan Teodoru,Vasile Mu?at
Bulletin of the Polytechnic Institute of Jassy, Constructions, Architechture Section , 2008,
Abstract: The traditional way to overcome the shortcomings of the Winkler foundation model is to incorporate spring coupling by assemblages of mechanical elements such as springs, flexural elements (beams in one-dimension, 1-D, plates in 2-D), shear-only layers and deformed, pretensioned membranes. This is the class of two-parameter foundations ? named like this because they have the second parameter which introduces interactions between adjacent springs, in addition to the first parameter from the ordinary Winkler?s model. This class of models includes Wieghardt, Filonenko-Borodich, Hetényi and Pasternak foundations. Mathematically, the equations to describe the reaction of the two-parameter foundations are equilibrium, and the only difference is the definition of the parameters. In order to analyse the bending behavior of a Euler-Bernoulli beam resting on linear variable two-parameter elastic foundation a (displacement) Finite Element (FE) formulation, based on the cubic displacement function of the governing differential equation, is introduced.
A Finite Element Study of the Bending Behavior of Beams Resting on Two-Parameter Elastic Foundation
Iancu-Bogdan Teodoru,Vasile Mu?at,M. Vrabie
Bulletin of the Polytechnic Institute of Jassy, Constructions, Architechture Section , 2006,
Abstract: Although the Winkler’s model is a poor representation of the many practical subgrade or subbase materials, it is widely used in soil-structure problems for almost one and a half century. The foundations represented by Winkler model can not sustain shear stresses, and hence discontinuity of adjacent spring displacements can occur. This is the prime shortcoming of this foundation model which in practical applications may result in significant inaccuracies in the evaluated structural response. In order to overcome these problem many researchers have been proposed various mechanical foundation models considering interaction with the surroundings. Among them we shall mention the class of two-parameter foundations -- named like this because they have the second parameter which introduces interactions between adjacent springs, in addition to the first parameter from the ordinary Winkler’s model. This class of models includes Filonenko-Borodich, Pasternak, generalized, and Vlasov foundations. Mathematically, the equations to describe the reaction of the two-parameter foundations arc equilibrium ones, and the only difference is the definition of the parameters. For the convenience of discussion, the Pasternak foundation is adopted in present paper. In order to analyse the bending behavior of a Euler-Bernoulli beam resting on two-parameter elastic foundation a (displacement) Finite Element (FE) formulation, based on the cubic displacement function of the governing differential equation, is introduced. The resulting effects of shear stiffness of the Pasternak model on the mechanical quantities are discussed in comparison with those of the Winkler’s model. Some numerical case studies illustrate the accuracy of the formulation and the importance of the soil shearing effect in the vertical direction, associated with continuous elastic foundation.
Book reviews
Vasile Vasile,Lucian Sinigaglia
Studii si Cercetari de Istoria Artei : Teatru, Muzic?, Cinematografie , 2010,
Abstract:
YOUTH LABOUR MARKET. MOBILITY, CAREER DEVELOPMENT, INCOMES. CHALLENGES AND OPPORTUNITIES
Vasile Valentina,Vasile Liviu
Annals of the University of Oradea : Economic Science , 2011,
Abstract: This paper presents the main characteristics of the youth labour market, with a special view on mobility, career development and incomes. The paper is substantiated by and continues the researches of the authors on the topic of labour force mobility and on the one of adaptability, respectively on youths' beahviour on labour market (with particular consideration of young graduates) highlighting the factors that adjust choices regarding taking up a job, career advancement, labour motivation, professional and personal satisfaction opportunities which are provided by the labour market at local level, in country and abroad. Quantitative and qualitative indicators are presented about Romanian youths' labour market within the European context during the transition period. The impact of the crisis on youths' labour market is analysed, highlighting the challenges and opportunities, the particularities of the newly created jobs and especially the knowledge, skills and competencies requirements (KSC). The authors propose both the improvement of the systems of indicators for defining the potential and presence of youth on the labour market, the economic and social impact of external mobility of young graduates and an integrated scheme of policy measures for promoting adaptability and performance integration on Romanian labour market of youth. Particular attention is paid to presenting policy instruments for halting/diminishing the brain drain and brain shopping phenomena by promoting an attractive (professionally and monetary) supply for employment in Romania's local economy. The authors succeed in highlighting the functional links between the education market (labour force supply) and labour market (employment demand of the business environment) underpinning the requirement of integrated management of labour potential in the years preceding studies' finalization and up to the post-insertion years by multi-criteria analysis models and graduate career tracking programmes. Correlative measures are suggested for policies, procedures and monitoring instruments of youths' adaptability on labour market, as alternative to external migration/mobility for labour.
Youths on labour market.Features. Particularities. Pro-mobility factors for graduates. Elements of a balanced policy for labour migration
Valentina VASILE,Liviu VASILE
Revista Romana de Economie , 2011,
Abstract: The youths’ labour market, and especially insertion employment has a series of particularities defined by aspects such as: flexibility, efficient employment, interest for career but also informal employment, external mobility, including brain drain, segmentation, employment precariousness, income disadvantages, etc. Therefore, also the labour market policy and particularly managing labour mobility especially through the economic and social effects that might be triggered on the local labour market in the origin country, presents a special importance under the conditions of the economic turnaround stage, by promoting new and sustainable jobs, based on knowledge and competences. In the present paper an analysis is made about the youths’ labour market features, and the outcomes of an empirical analysis about graduates’ migration propensity are presented. Suggestions are made for developing a balanced policy for youths’ labour mobility to the benefit of the country of origin.
A Mathematical Model for Logarithmic Image Processing
Vasile Patrascu,Vasile Buzuloiu
Computer Science , 2014,
Abstract: In this paper, we propose a new mathematical model for image processing. It is a logarithmical one. We consider the bounded interval (-1, 1) as the set of gray levels. Firstly, we define two operations: addition <+> and real scalar multiplication . With these operations, the set of gray levels becomes a real vector space. Then, defining the scalar product (.|.) and the norm || . ||, we obtain an Euclidean space of the gray levels. Secondly, we extend these operations and functions for color images. We finally show the effect of various simple operations on an image.
Image Dynamic Range Enhancement in the Context of Logarithmic Models
Vasile Patrascu,Vasile Buzuloiu
Computer Science , 2014,
Abstract: Images of a scene observed under a variable illumination or with a variable optical aperture are not identical. Does a privileged representant exist? In which mathematical context? How to obtain it? The authors answer to such questions in the context of logarithmic models for images. After a short presentation of the model, the paper presents two image transforms: one performs an optimal enhancement of the dynamic range, and the other does the same for the mean dynamic range. Experimental results are shown.
Color Image Enhancement In the Framework of Logarithmic Models
Vasile Patrascu,Vasile Buzuloiu
Computer Science , 2014,
Abstract: In this paper, we propose a mathematical model for color image processing. It is a logarithmical one. We consider the cube (-1,1)x(-1,1)x(-1,1) as the set of values for the color space. We define two operations: addition <+> and real scalar multiplication . With these operations the space of colors becomes a real vector space. Then, defining the scalar product (.|.) and the norm || . ||, we obtain a (logarithmic) Euclidean space. We show how we can use this model for color image enhancement and we present some experimental results.
The Affine Transforms for Image Enhancement in the Context of Logarithmic Models
Vasile Patrascu,Vasile Buzuloiu
Computer Science , 2014,
Abstract: The logarithmic model offers new tools for image processing. An efficient method for image enhancement is to use an affine transformation with the logarithmic operations: addition and scalar multiplication. We define some criteria for automatically determining the parameters of the processing and this is done via mean and variance computed by logarithmic operations.
Some remarks on the invariant subspace problem for hyponormal operators
Vasile Lauric
International Journal of Mathematics and Mathematical Sciences , 2001, DOI: 10.1155/s0161171201011966
Abstract: We make some remarks concerning the invariant subspace problem for hyponormal operators. In particular, we bring together various hypotheses that must hold for a hyponormal operator without nontrivial invariant subspaces, and we discuss the existence of such operators.
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