Iram H.,Fast campus |
2015 Power Generation Systems and Renewable Energy Technologies, PGSRET 2015 | Year: 2015
Renewable energy resources are the major demand of the day. As fossil fuels are limited so we just can't rely on them especially in this new age where the demand of energy has increased drastically. Solar energy can be one of the effective renewable energy sources. This is a new way of looking at a solar panel that we can generate alternating current directly from photovoltaic cells. We can use an array of photovoltaic cell pairs that are connected in anti-parallel form to create an AC wave form. Solar panels today produce DC power which has to be firstly converted into AC to be mostly used in business and home appliances. Solar panels become very expensive when we add solar panel's price joint with the price of inverters and phase synchronizers. In addition to that the power losses of different components that are used in the DC to AC converters so it becomes even more unappealing. We show a new technique for the generation of AC power from Solar panel devoid of inverter. By adopting this technique we can remove power losses due to an inverter. There is no need of batteries in our technique so overall cost is also reduced. Another very good aspect of this technique is that we get a very pure sine wave of better efficiency than that of an AC inverter. We can generate the sine wave of any frequency by just controlling the speed of motor used in this technique. So it is a very simple technique with great effects. © 2015 IEEE.
PubMed | Fast campus
Type: Journal Article | Journal: Cuadernos de bioetica : revista oficial de la Asociacion Espanola de Bioetica y Etica Medica | Year: 2015
We start with a definition of robot in order to understand which are legitimate robotics objectives. Then it is provided an outline of new robot generations and their industrial and biomedical applications. We consider the consequences of this new kind of technology on the notion of intelligence, stressing how the exteroceptive sensor systems provide a new bottom up approach to the AI debate. We consider three challenges Robotics have to face nowadays. First materials and components, which are built with technologies top-down, set huge limits in terms of weight, speed, safety and cost, not to mention reliability and durability. Second the methodological aspects: the challenge concerns the management of complexity. How to achieve intelligent and adaptive behaviours out of the control system of the robot, which must remain intrinsically simple? A third issue we address is the cultural one: the unreasonable expectations of the general public often provoked by a misunderstanding of the notion of intelligence itself. We consider then what makes human specifically human from a broader philosophic point of view, pointing out how the will is strangely absent in the AI debate. We show three advantages connected with this different perspective instead of the classical one intellect centered. First, while intellect is not used only by man, will is. Second, desire involves intellect while the reciprocal is not necessarily true. Third, looking at robotics and more specifically to cybernetics the key concept of these fields are control and governance, whereas both of them are specifically relate to the domain of will rather than intellect. We look then into the concept of participation as essential to the understanding of the notion of will, to overcome some roboethics issues related to the adoption of the still dominant rationalistic paradigm.
Giorgiutti-Dauphine F.,Fast campus |
Pauchard L.,University Paris - Sud
European Physical Journal E | Year: 2014
The drying of colloidal films usually leads to mechanical instabilities that affect the uniformity of the final deposit. The resulting patterns are the signature of the mechanical stress, and reveal the way the system consolidates. We report experimental results on the crack patterns induced by the drying of sessile drops of concentrated dispersions. Crack patterns exhibit a well-defined spatial order, and a regular temporal periodicity. In addition, the onset of cracking occurs after a well-defined elapsed time that depends on the mechanical properties of the gel, and on the drying kinetics. The estimation of the time elapsed before cracks form is related to the elastic properties of the material. This is supported by quantitative measurements using indentation testing and by a simple scaling law derived from poro-elastic theory. © 2014 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
Lopez H.M.,University Paris - Sud |
Lopez H.M.,Fast campus |
Gachelin J.,University Paris Diderot |
Douarche C.,University Paris - Sud |
And 3 more authors.
Physical Review Letters | Year: 2015
The rheological response under simple shear of an active suspension of Escherichia coli is determined in a large range of shear rates and concentrations. The effective viscosity and the time scales characterizing the bacterial organization under shear are obtained. In the dilute regime, we bring evidence for a low-shear Newtonian plateau characterized by a shear viscosity decreasing with concentration. In the semidilute regime, for particularly active bacteria, the suspension displays a "superfluidlike" transition where the viscous resistance to shear vanishes, thus showing that, macroscopically, the activity of pusher swimmers organized by shear is able to fully overcome the dissipative effects due to viscous loss. © 2015 American Physical Society.
Hassan S.,Fast campus |
Rafi M.,Fast campus |
Shaikh M.S.,Fast campus
Proceedings of the 14th IEEE International Multitopic Conference 2011, INMIC 2011 | Year: 2011
The activity of labeling of documents according to their content is known as text categorization. Many experiments have been carried out to enhance text categorization by adding background knowledge to the document using knowledge repositories like Word Net, Open Project Directory (OPD), Wikipedia and Wikitology. In our previous work, we have carried out intensive experiments by extracting knowledge from Wikitology and evaluating the experiment on Support Vector Machine with 10- fold cross-validations. The results clearly indicate Wikitology is far better than other knowledge bases. In this paper we are comparing Support Vector Machine (SVM) and Naïve Bayes (NB) classifiers under text enrichment through Wikitology. We validated results with 10-fold cross validation and shown that NB gives an improvement of +28.78%, on the other hand SVM gives an improvement of +636% when compared with baseline results. Naïve Bayes classifier is better choice when external enriching is used through any external knowledge base. © 2011 IEEE.
Li Z.-H.,Fast campus |
Ribe N.M.,Fast campus
Journal of Geophysical Research: Solid Earth | Year: 2012
In order better to understand the physical mechanisms underlying free subduction, we perform three-dimensional boundary-element numerical simulations of a dense fluid sheet with thickness h and viscosity η2 sinking in an ambient mantle with viscosity η1. The mantle layer is bounded above by a traction-free surface, and is either (1) infinitely deep or (2) underlain by a rigid boundary at a finite depth H + d, similar to the typical geometry used in laboratory experiments. Instantaneous solutions in configuration (1) show that the sheet's dimensionless stiffness S determines whether the slab's sinking speed is controlled by the viscosity of the ambient mantle (S < 1) or the viscosity of the sheet itself (S > 10). Time-dependent solutions with tracers in configuration (2) demonstrate a partial return flow around the leading edge of a retreating slab and return flow around its sides. The extra edge drag exerted by the flow around the sides causes transverse deformation of the slab, and makes the sinking speed of a 3-D slab up to 40% less than that of a 2-D slab. A systematic investigation of the slab's interaction with the bottom boundary as a function of η2/ η1 and H/h delineates a rich regime diagram of different subduction modes (trench retreating, slab folding, trench advancing) and reveals a new advancing-folding mode in which slab folding is preceded by advancing trench motion. The solutions demonstrate that mode selection is controlled by the dip of the leading edge of the slab at the time when it first encounters the bottom boundary. © 2012. American Geophysical Union. All Rights Reserved.
Ahmad R.,Fast campus |
Amin S.H.,Fast campus |
Khan M.A.U.,Fast campus
Proceedings - 2010 6th International Conference on Emerging Technologies, ICET 2010 | Year: 2010
Cursive scripts such as Urdu, Pashto and Arabic contain large number of unique shapes called ligatures. Recognition of thousands of ligatures is challenging due to variations of various kinds including scaling, orientation, font style, spatial location/registration of ligatures and limited number of samples available for training. Accurate segmentation is a key challenge for analytic approaches, whereas holistic approaches suffer due to limitations of various feature representation schemes. In this paper, the use of SIFT descriptor has been proposed to evaluate its effectiveness for representing Pashto ligatures while overcoming above mentioned challenges in a holistic framework. The proposed approach is script independent and can be easily adapted to other cursive languages. A comparison of recognition results against classical methods such as PCA is provided to test the effectiveness of feature representation. Our research shows that SIFT descriptor  perform better than classical feature representation methods such as PCA. The proposed recognition is holistic using ligature (word) based classification. We have tested 1000 unique ligatures (images) with 4 different sizes, along with their rotated images; and average recognition rate that is obtained is 74%. © 2010 IEEE.
Sauret A.,Universites Aix Marseille |
Cbron D.,Universites Aix Marseille |
Morize C.,Universites Aix Marseille |
Morize C.,Fast campus |
Le Bars M.,Universites Aix Marseille
Journal of Fluid Mechanics | Year: 2010
We study both experimentally and numerically the steady zonal flow generated by longitudinal librations of a spherical rotating container. This study follows the recent weakly nonlinear analysis of Busse (J. Fluid Mech., vol. 650, 2010, pp. 505-512), developed in the limit of small libration frequency-rotation rate ratio and large libration frequency-spin-up time product. Using particle image velocimetry measurements as well as results from axisymmetric numerical simulations, we confirm quantitatively the main features of Busse's analytical solution: the zonal flow takes the form of a retrograde solid-body rotation in the fluid interior, which does not depend on the libration frequency nor on the Ekman number, and which varies as the square of the amplitude of excitation. We also report the presence of an unpredicted prograde flow at the equator near the outer wall. © 2010 Cambridge University Press.
Valera L.,Fast campus
Medicina nei secoli | Year: 2011
Ecology (from the Greek words οιχοσ, "house" and λογια "study of") is the science of the "house", since it studies the environments where we live. There are three main ways of thinking about Ecology: Ecology as the study of interactions (between humans and the environment, between humans and living beings, between all living beings, etc.), Ecology as the statistical study of interactions, Ecology as a faith, or rather as a science that requires a metaphysical view. The history of Ecology shows us how this view was released by the label of "folk sense" to gain the epistemological status of science, a science that strives to be interdisciplinary. So, the aim of Ecology is to study, through a scientific methodology, the whole natural world, answering to very different questions, that arise from several fields (Economics, Biology, Sociology, Philosophy, etc.). The plurality of issues that Ecology has to face led, during the Twentieth-century, to branch off in several different "ecologies". As a result, each one of these new approaches chose as its own field a more limited and specific portion of reality.
Di Giuseppe E.,Fast campus |
Moroni M.,University of Rome La Sapienza |
Caputo M.,University of Rome La Sapienza
Transport in Porous Media | Year: 2010
The classic constitutive equation relating fluid flux to a gradient in potential (pressure head plus gravitational energy) through a porous medium was discovered by Darcy in the mid 1800s. This law states that the flux is proportional to the pressure gradient. However, the passage of the fluid through the porous matrix may cause a local variation of the permeability. For example, the flow may perturb the porous formation by causing particle migration resulting in pore clogging or chemically reacting with the medium to enlarge the pores or diminish the size of the pores. In order to adequately represent these phenomena, we modify the constitutive equations by introducing a memory formalism operating on both the pressure gradient-flux and the pressure-density variations. The memory formalism is then represented with fractional order derivatives. We perform a number of laboratory experiments in uniformly packed columns where a constant pressure is applied on the lower boundary. Both homogeneous and heterogeneous media of different characteristic particle size dimension were employed. The low value assumed by the memory parameters, and in particular by the fractional order, demonstrates that memory is largely influencing the experiments. The data and theory show how mechanical compaction can decrease permeability, and consequently flux. © Springer Science+Business Media B.V. 2009.