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Search Results: 1 - 10 of 208568 matches for " L. Crippa "
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Exponential self-similar mixing and loss of regularity for continuity equations
Giovanni Alberti,Gianluca Crippa,Anna L. Mazzucato
Mathematics , 2014,
Abstract: We consider the mixing behaviour of the solutions of the continuity equation associated with a divergence-free velocity field. In this announcement we sketch two explicit examples of exponential decay of the mixing scale of the solution, in case of Sobolev velocity fields, thus showing the optimality of known lower bounds. We also describe how to use such examples to construct solutions to the continuity equation with Sobolev but non-Lipschitz velocity field exhibiting instantaneous loss of any fractional Sobolev regularity.
Existence and uniqueness of measure solutions for a system of continuity equations with non-local flow
Gianluca Crippa,Magali Lécureux-Mercier
Mathematics , 2011,
Abstract: In this paper, we prove existence and uniqueness of measure solutions for the Cauchy problem associated to the (vectorial) continuity equation with a non-local flow. We also give a stability result with respect to various parameters.
The impact of new product introduction on supply chain ability to match supply and demand
R Crippa, L Larghi, M Pero, A Sianesi
International Journal of Engineering, Science and Technology , 2010,
Abstract: Supply chain managers should redesign their supply chains in response to the introduction of a new product. In particular, to reach performance targets, they should align the supply chain to the new product features. The objective of this paper is to highlight the negative effects of mis-alignment between product features and supply chains and to propose a set of misalignment indicators, along with an action plan to align supply chains to new products. To this end, an in-depth case study has been performed. In the analyzed company the introduction of a new product line was not followed by a proper redesign of the logistics network, thus reducing supply chain performance. The mis-alignment has been evaluated against a new indicator. Moreover, the main product features that should have been taken into account when redesigning the network, i.e. internal and external variety, and innovativeness, have been highlighted. Finally, a two steps methodology to define a set of coordinated action between product development department and supply chain mangers have been proposed.
Quantitative determination of carbonaceous particle mixing state in Paris using single particle mass spectrometer and aerosol mass spectrometer measurements
R. M. Healy,J. Sciare,L. Poulain,M. Crippa
Atmospheric Chemistry and Physics Discussions , 2013, DOI: 10.5194/acpd-13-10345-2013
Abstract: Single particle mixing state information can be a powerful tool for assessing the relative impact of local and regional sources of ambient particulate matter in urban environments. However, quantitative mixing state data are challenging to obtain using single particle mass spectrometers. In this study, the quantitative chemical composition of carbonaceous single particles has been estimated using an aerosol time-of-flight mass spectrometer (ATOFMS) as part of the MEGAPOLI 2010 winter campaign in Paris, France. Relative peak areas of marker ions for elemental carbon (EC), organic aerosol (OA), ammonium, nitrate, sulphate and potassium were compared with concurrent measurements from an Aerodyne high resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS), a thermal/optical OCEC analyser and a particle into liquid sampler coupled with ion chromatography (PILS-IC). ATOFMS-derived mass concentrations reproduced the variability of these species well (R2 = 0.67–0.78), and ten discrete mixing states for carbonaceous particles were identified and quantified. Potassium content was used to identify particles associated with biomass combustion. The chemical mixing state of HR-ToF-AMS organic aerosol factors, resolved using positive matrix factorization, was also investigated through comparison with the ATOFMS dataset. The results indicate that hydrocarbon-like OA (HOA) detected in Paris is associated with two EC-rich mixing states which differ in their relative sulphate content, while fresh biomass burning OA (BBOA) is associated with two mixing states which differ significantly in their OA/EC ratios. Aged biomass burning OA (OOA2-BBOA) was found to be significantly internally mixed with nitrate, while secondary, oxidized OA (OOA) was associated with five particle mixing states, each exhibiting different relative secondary inorganic ion content. Externally mixed secondary organic aerosol was not observed. These findings demonstrate the heterogeneity of primary and secondary organic aerosol mixing states in Paris. Examination of the temporal behaviour and chemical composition of the ATOFMS classes also enabled estimation of the relative contribution of transported emissions of each chemical species and total particle mass in the size range investigated. Only 22% of the total ATOFMS-derived particle mass was apportioned to fresh, local emissions, with 78% apportioned to regional/continental scale emissions.
Facial emotion processing and recognition among maltreated children: a systematic literature review
José Alexandre S. Crippa,Flávia L. Osório
Frontiers in Psychology , 2014, DOI: 10.3389/fpsyg.2014.01460
Abstract: Exposure to maltreatment is associated with biological, psychological, and social development impairments in children. This systematic literature review sought to determine whether an association exists between child maltreatment and facial emotion processing and recognition. The search was conducted using the databases PubMed, PsycINFO, and SciELO using the following keywords: “maltreatment,” “adversity,” “neglect,” “sexual abuse,” “emotional abuse,” “physical abuse,” “child*,” “early,” “infant,” “face,” “facial,” “recognition,” “expression,” “emotion*,” and “impairment.” Seventeen articles were selected and analyzed. Maltreated children tended to exhibit less accuracy in global facial tasks and showed greater reactivity, response bias, and electrophysiological activation of specific brain areas in response to faces expressing negative emotions, especially anger. We concluded that the results of this review are exploratory and non-conclusive due to the small number of studies published and the wide variety of aims and procedures. Those shortcomings notwithstanding, the results indicate definite tendencies and gaps that should be more thoroughly explored in future studies.
O grotesco como estratégia de afirma??o da produ??o pictórica feminina
Crippa, Giulia;
Revista Estudos Feministas , 2003, DOI: 10.1590/S0104-026X2003000100007
Abstract: a proposal of gender interpretation of female artistic production during the so called modernism, based on common elements in tarsila do amaral's, frida kalho's, tamara de lempicka's and georgia o'keeffe's art works, without denying their individual dimension, built upon the esthetic definition of grotesque. grotesque, in its gender and historical expression, seems to represent a face of the common language used by women, trying to meet a strategy in order to be recognized by critics and markets. though, at one side, visual and decorative tradition set the "idealized feminine", on the other side grotesque, as a way of breaking reality as rational and coherent, historically related to anti-classic movement, offers an opening to a sexuated and non-conformist expression to female artists.
A solu??o cartesiana da quadratura do círculo
Crippa, Davide;
Scientiae Studia , 2010, DOI: 10.1590/S1678-31662010000400005
Abstract: although the problem of squaring the circle, that is, the problem of constructing a square having the same area of a given circle, was considered an open problem among early xviith century mathematicians, rené descartes affirmed that it could not be solved. on the other hand, he himself provided a solution to the problem, that can be dated in the period, 1625-1628. in this article, i will examine this solution by comparing it to an analysis made a century later by euler, and to a solution known to the ancients and discussed by pappus. i will investigate, successively, the reasons that led descartes to dismiss these two solutions as not acceptable in the light of the ideal of exactness deployed in the geometry.
Representa??es iconográficas e literárias da produ??o de alimentos: espa?os, atores e ideologias entre Antiguidade e Idade Média
Crippa, Giulia;
Revista de Nutri??o , 2010, DOI: 10.1590/S1415-52732010000100016
Abstract: an iconographic and literary study on seasonal work as productive cycle between antiquity and the late middle ages is proposed, looking for boundaries between the iconographies and economy and society that produced them. the auspicious representation prevails in the historical view of iconographies associated with the prediction and hope of abundance. within the medieval society they are deeply bounded to main themes such as season changes, cyclic passage of time, journey through birth, death and resurrection. the representations of monthly work and activities change, and this change is much more than a mirror reflection, a reflection of society on the space and actors of the food production cycle. the legacy of antiquity to the middle ages is a great amount of images based on notions of personification as well of reference for the activities associated with the seasonal changes, a legacy that will be assessed and changed based on the new social and religious experience. these permeate the century during which most of the month cycles illustrated by productive works in the field are produced.
Reflex es acerca do espetáculo como fundamento cultural do Ocidente
Giulia Crippa
Eccos Revista Científica , 2001,
Abstract: A critical overview of western culture using, as an interpretative key, Guy Debords definition of Spectacular Society. It is observed that western society is able to preserve and sustain its legitimate power(s), in a spectacular dimension, through a systematic operation of alienation of living reality and its substitution via images, adapted by the very same power. This can be seen since the vanishing of feudal relations in the urban world of the XIIth century, where a pre-capitalist economy based on commercial trades emerges. In this frame, the worst heresies and riots are found, together with the attempt made by the Church to preserve its orthodoxy through the spectacularization of its doctrine. Renaissance shows a slightly better equilibrium of power and society when seen through spectacular focus, but Protestant reform generates, insight the roman Church, the need of a new spectacularization for the Christians masses, creating the Baroque. Still, during French Revolution, a spectacularization of the same revolution permits a massive participation, through ways and contents, creating the spectacular contemporary mass society.
Rese a de Guerrilha psíquica. S o Paulo: Conrad de Luther Blissett
Giulia Crippa
Eccos Revista Científica , 2002,
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