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Using Rapid Prototyping Data to Enhance a Knowledge-Based Framework for Product Redesign  [PDF]
Stefano FILIPPI, Ilaria CRISTOFOLINI
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.21001
Abstract: The particular characteristics of Rapid Prototyping technologies, both in terms of constrains and opportunities, often require the reconfiguration of the product model to obtain the best compliance with the product functionalities and performances. Within this field of research, a knowledge-based tool named Design GuideLines Collaborative Framework (DGLs-CF) was developed to support both the designers defining the product consistently with the manufacturing technologies and the manufacturers defining the building setup consistently with the product requirements. Present work is focused on enhancing the DGLs-CF knowledge base and on updating the DGLs-CF knowledge management by using the information gathered on some RP technologies. The added-value of this research is represented by an improvement in the Redesign/Reconfig- uration Package, the final result of the DGLs-CF adoption. This is a list of actions to be performed on the product model and on the process parameters to avoid the limitations of the technology and to exploit at best its opportunities.
Refletindo sobre a Provinha Brasil a partir das dimens?es sociocultural, linguística e cognitiva da leitura
Cristofolini, Carla;
Alfa : Revista de Linguística (S?o José do Rio Preto) , 2012, DOI: 10.1590/S1981-57942012000100010
Abstract: the aim of this study is to analyze the extent to which reading, in its sociocultural, linguistic, and cognitive dimensions (cerutti-rizzatti, 2009), was taken into account in the first 2009 edition of the literacy standardized national assessment test, provinha brazil. to accomplish this goal, it draws on both the documents that guide the pedagogical action - both national (brasil, 2007) and municipal (s?o josé, 2000, 2007) - specified in the guide manuals included in the provinha kit and the results of this assessment for five 2nd-year classes of a municipal school in grande florianópolis. the provinha questions were classified into two major groups (decoding skills and textualization) and discussed individually, merging theoretical discussions on literacy with the results achieved by the students. the conclusion stresses that provinha brasil is biased towards the linguistic and cognitive dimensions of reading to the detriment of its sociocultural dimension.
Refletindo sobre a provinha Brasil a partir das dimens es sociocultural, linguística e cognitiva da leitura
Carla Cristofolini
Alfa : Revista de Linguística , 2012,
Abstract: Este artigo prop e-se a interpretar como a leitura, em suas dimens es sociocultural, linguística e cognitiva (CERUTTI-RIZZATTI, 2009), está contemplada na avalia o nacional padronizada da alfabetiza o, a Provinha Brasil, em sua primeira edi o do ano de 2009. Para tanto, s o tra adas algumas reflex es a partir de documentos norteadores da a o pedagógica tanto federais (BRASIL, 2007) quanto municipais (SECRETARIA MUNICIPAL DE EDUCA O, 2000, 2007), dos Guias que acompanham o kit da Provinha e dos resultados obtidos nessa avalia o por cinco turmas de 2o ano de uma escola pública, municipal, da grande Florianópolis. As quest es da Provinha foram classificadas em dois grandes grupos (quest es focadas nas habilidades de decodifica o e aquelas envolvendo textualiza o) e s o discutidas individualmente, aliando discuss o teórica (conceitos pertinentes à alfabetiza o e letramento) com os resultados apresentados pelos alunos. Como principal conclus o, observa-se que essa edi o da Provinha Brasil foca principalmente as dimens es linguística e cognitiva da leitura, em detrimento da dimens o sociocultural.
Comparison of Mathematical Methods to Obtain Concentration and Temperature of Newtonian Fluids in Tubular Reactors  [PDF]
Diego Alves de Miranda, Renato Cristofolini, Emerson José Corazza, Gilson Joao dos Santos, Claiton Emilio do Amaral
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104329
Abstract:
In several areas of engineering, it is possible to put real problems in mathematical functions; when we represent a problem with variables in the form of function, we were able to extract various information from it. This paper compared two different mathematical methods, being the finite difference method and the Fourth Order Range-Kutta method, to analyze the concentration and temperature of the water flow inside a tubular reactor. These results were compared with the analytical and experimental results of the problem, demonstrating that the Fourth Order Range-Kutta method was more advantageous than the finite difference method.
Characteristics of volcanic tremor accompanying the September 24th, 1986 explosive eruption of Mt. Etna (Italy)
S. Gresta,G. Lombardo,R. Cristofolini
Annals of Geophysics , 1996, DOI: 10.4401/ag-3976
Abstract: Features of the volcanic tremor recorded before, during and after the eruptive event which occurred at Mt. Etna on September 24th 1986, are described. The whole eruption was particularly short in time (about eight hours) and characterized by an extremely violent explosive activity with lava fountains a few hundred meters high. As the complete record of the seismic signals generated during the whole eruptive episode was available, a detailed spectral analysis of the volcanic tremor recorded at four stations, located at increasing distance from the summit of the volcano, was carried out. Fourier analysis, that was performed using temporal windows of about 11 min in duration, pointed to some large fluctuations of the overall spectral amplitude, as well as some frequency variations of the dominant spectral peaks. The ratio of the overall spectral amplitude recorded at the highest station and at the peripheral ones, was calculated in the two spectral bands 1.0-2.5 and 2.6-6.0 Hz, respectively. The significant contribution of energy at low frequency values supports the hypothesis of a subvertical planar source, which was active during the paroxysmal stage of the eruption. Such results are also supported by the analysis of the attenuation function of the spectral amplitude.
Analysis of the thixoability of ASTM A536 ductile iron
M.H. Robert,R. Cristofolini
Journal of Achievements in Materials and Manufacturing Engineering , 2008,
Abstract: Purpose: Thixoability of the ASTM A536 nodular cast iron is analyzed, it meaning its ability to hold a thixotropic semi-solid state and to be formed as such. Thixoability can be characterized by the solidification range, fraction of primary phase and sensitiveness of liquid fraction with temperature (dfl/dT) within the solidification range. It is also investigated the effect of thixocasting in the microstructure of the considered alloy.Design/methodology/approach: Differential thermal analysis, differential scanning calorimetry and thermodynamic calculation package THERMOCALC were used to predict transformations temperatures involving liquid formation and dfl/dT within the solidification range. Microstructures of thixotropic slurries produced by partial melting were observed.Findings: Thixoforming of ASTM A536 nodular iron can be considered in a narrow window of about 28°C, were some dissolution of graphite nodules can still be afforded; this window meaning the range of temperatures of co-existence of austenite + graphite + liquid were the eutectic transformation is taking place. At higher temperatures the dissolution of graphite nodules in liquid can be significant.Research limitations/implications: Thixoability prediction models rely on sensitive experiments as thermoanalysis, with results strongly dependent on experimental conditions; and on thermodynamic data, sometimes not available or reliable for a specific alloy composition.Practical implications: The prediction of the thixoability of a certain alloy can make it more effective its thixoprocessing, allows better control of processing parameters and quality of final product; can also subsidize modifications in the alloy to make it more suitable to semi-solid processing.Originality/value: The study of the thixoability of a nodular hypereutectic cast iron is an original subject, not available in the specialized literature, however absolutely necessary if thixoprocessing of this family of alloys is to be considered.
Equilibrium and out-of-equilibrium dynamics in a molecular layer of azopolymer floating on water studied by Interfacial Shear Rheology
Davide Orsi,Luigi Cristofolini,Marco P. Fontana
Physics , 2010, DOI: 10.1016/j.jnoncrysol.2010.06.057
Abstract: We report the details of the construction and calibration of an ultra sensitive surface rheometer, inspired by the setup described in [C.F. Brooks et al Langmuir 15, 2450 (1999)], which makes use of high resolution video tracking of the motion of a floating magnetized needle and is capable of measuring the viscoelastic response of a Langmuir monolayer with an accuracy of 10^-5 N/m. This instrument is then employed for the rheological characterization of a Langmuir monolayer of a photosensitive azobenzene polymer, which can be brought out of equilibrium by a suitable photoperturbation. The complex dynamic shear modulus G= G' + i G" is measured as a function of temperature and illumination power and wavelength. The reversible rheological ch anges induced in the film by photo-perturbation are monitored during time, observing a transition from a predominantly elastic (G' > G'') to a viscoelastic (G' \approx G'') regime. These results are confirmed by comparison with independent measurements performed by us using other rheological techniques. Finally a discussion is made, taking into account the results of a recent x-ray photon correlation spectroscopy experiment on the same polymer in equilibrium and out of equilibrium.
Expression of Death Cellular Receptors FAS/CD95 and DR4 During Porcine Placentation
Merkis,C; Cristofolini,A; Sanchis,E; Koncurat,M;
International Journal of Morphology , 2010, DOI: 10.4067/S0717-95022010000300026
Abstract: apoptosis is a permanent and dynamic physiological process by which an organism eliminates the undesirable cells without causing an inflammatory response. the objective of this work was to study the expression of fas, dr4 and other members of the tnf-r1 superfamily extrinsic route apoptotic receptors the dna fragmentation and the cellular apoptosis in placental samples at the early, mid and late pregnancy on ± 30, ± 55 and ± 114 gestational days, respectively. we used placental histological sections of samples fixed in buffered saline formaldehyde. immunohistochemical techniques were performed to detect the apoptotic receptors, whereas the dna fragmentation was detected by tunel reaction and apoptotic cellular ultrastructure was detected by tem conventional techniques. apoptosis related receptors were immunolocalized in the early pig gestation and correlated with apoptosis, suggesting a role in the cellular remodelling of the placenta. at gestation day 55, apoptosis might be correlated to fas route, but not by dr4-mediating pathway. at the end of gestation, increased apoptosis and both receptors markers were detected showing cellular death due to the extrinsic route through fas and dr4 receptors. in conclusion, the immunolocalization of fas and tnf r-1 receptors along the pig placental development correlates with tunel reaction and with apoptotic ultrastructure observed by tem and seems to occur through different pathways along gestation.
Expression of Death Cellular Receptors FAS/CD95 and DR4 During Porcine Placentation Expresión de los Receptores de Muerte Celular FAS/CD95 y DR4 Durante la Placentación Porcina
C Merkis,A Cristofolini,E Sanchis,M Koncurat
International Journal of Morphology , 2010,
Abstract: Apoptosis is a permanent and dynamic physiological process by which an organism eliminates the undesirable cells without causing an inflammatory response. The objective of this work was to study the expression of FAS, DR4 and other members of the TNF-R1 superfamily extrinsic route apoptotic receptors the DNA fragmentation and the cellular apoptosis in placental samples at the early, mid and late pregnancy on ± 30, ± 55 and ± 114 gestational days, respectively. We used placental histological sections of samples fixed in buffered saline formaldehyde. Immunohistochemical techniques were performed to detect the apoptotic receptors, whereas the DNA fragmentation was detected by TUNEL reaction and apoptotic cellular ultrastructure was detected by TEM conventional techniques. Apoptosis related receptors were immunolocalized in the early pig gestation and correlated with apoptosis, suggesting a role in the cellular remodelling of the placenta. At gestation day 55, apoptosis might be correlated to FAS route, but not by DR4-mediating pathway. At the end of gestation, increased apoptosis and both receptors markers were detected showing cellular death due to the extrinsic route through FAS and DR4 receptors. In conclusion, the immunolocalization of FAS and TNF R-1 receptors along the pig placental development correlates with TUNEL reaction and with apoptotic ultrastructure observed by TEM and seems to occur through different pathways along gestation. La apoptosis es un proceso fisiológico, dinámico y permanente a través del cual un organismo elimina células indeseables sin provocar una respuesta inflamatoria. El objetivo del presente trabajo fue estudiar la expresión de los receptores de la vía extrínseca de apoptosis, FAS, DR4 y otros miembros de la superfamilia TNF-R1, la fragmentación del ADN y la apoptosis celular a través de TEM, en muestras placentarias del inicio, la mitad y el final de la gestación, hacia el día ± 30, ± 55 y ± 114 de pre ez, respectivamente. Se realizaron cortes histológicos de las muestras placentarias fijadas en formol tamponado. Para la detección de los receptores de apoptosis se realizaron técnicas inmunohistoquímicas, para el estudio de la fragmentación del ADN se utilizó el ensayo TUNEL y para el análisis de la ultraestructura celular apoptótica la técnica convencional de TEM. La inmunolocalización de los receptores de muerte celular al inicio de la pre ez porcina sugiere el rol de la apoptosis en la remodelación celular placentaria. Hacia el día 55 de pre ez, la apoptosis detectada ocurriría únicamente a través de la vía del receptor
Geología de la porción occidental de la sierra de Valle Fértil, San Juan, a partir de observaciones en la quebrada de otarola Geology of the western portion of the Sierra de Valle Fértil, San Juan, from observations in the Quebrada de Otarola
Eber Cristofolini,Juan Otamendi,Alina Tibaldi,Roberto Martino
Revista de la Asociación Geológica Argentina , 2010,
Abstract: El presente trabajo presenta las relaciones de campo, los rasgos petrológicos y estructurales del complejo cristalino que constituye la porción centro-occidental de la sierra de Valle Fértil, provincia de San Juan. El complejo cristalino está constituido por cinco asociaciones litológicas, distinguidas como: rocas gábricas, rocas dioríticas, migmatitas metasedimentarias, granitos pegmatíticos y rocas de la serie milonítica. La fábrica ígnea preservada en la asociación gábrica se manifiesta por un encapado cumular (S0a) y/o por bandas de flujo magmático (S0b). En muchos lugares, la fábrica primaria está retrabajada por la foliación submagmática (S1). Esta foliación está asociada a bajas tasas de esfuerzo diferencial y el único cambio en la mineralogía ígnea y metamórfica primaria es el incremento de hornblenda en las rocas máficas y de biotita-sillimanita en las metasedimentitas. Esto sugiere que el evento deformacional (D1) actuó en altas temperaturas y coetáneamente con el magmatismo. El evento deformacional (D2) está relacionado a una alta tasa de cizallamiento, y genera las fábricas S2a y S2b ligadas a típicas rocas de la serie milonítica. El análisis de la cinemática en milonitas, indican un transporte tectónico inverso con vergencia al oeste durante el período deformacional D2. Todas las estructuras son truncadas por una estructura planar de carácter frágil (S3). La edad U-Pb de 474 ± 4,7 Ma registrada en circones de una migmatita metasedimentaria, indica la edad del pico metamórfico. Esto prueba que las rocas metasedimentarias registraron condiciones metamórficas de facies de granulitas al mismo tiempo que tenía lugar la actividad magmática del Ordovícico Inferior. This work presents field relationships, petrography and structural features of the crystalline complex that form the central-western portion of the Valle Fértil range, San Juan. The crystalline complex comprises five main lithologic associations: gabbroic rocks, dioritic rocks, metasedimentary migmatites, pegmatitic granites and mylonite series rocks. The fabric igneous preserved in the gabbroic association is which manifest as either layering of cumulate origin (S0a) and magmatic flow bands (S0b). In most places, the primary fabrics occur reworked and/or cross-cut by the submagmatic foliation (S1). However, S1 is associated with low differential stress and the only changes in the primary igneous and metamorphic mineral assemblages are growth of hornblende in mafic rocks and biotite + sillimanite in the metasedimentary rocks. This suggests that (D1) deformation acted under high temperat
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