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Search Results: 1 - 10 of 145476 matches for " Margarida F.;Salvadori "
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Danos de Rhopalosiphum padi (L.) (Hemiptera: Aphididae) no trigo em fun??o da dura??o e da densidade de infesta??o
Roza-Gomes, Margarida F.;Salvadori, José R.;Schons, Jurema;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000500013
Abstract: aphids are considered relevant pests on wheat either by direct damage through sap sucking or by indirect damage vectoring bydv (barley yellow dwarf virus). rhopalosiphum padi l. has been observed infesting wheat fields with an increasing frequency. the knowledge and the available technology, besides being more related to other aphids species already recognized as pests, they are insufficient to control the specific problem of r. padi. thus, this work evaluated the effects of feeding duration and infestation densities of r. padi on seedlings of wheat cv. embrapa 16. grain yield, yield components and the extent of symptoms were recorded. the experiment was carried out in the field under a completely randomized split-plot experimental design with four replications. the main plot was feeding duration (two and seven days) and the sub-plots were infestation densities (zero, two and 10 aphids per plant). independent on feeding duration, 10 aphids per plant resulted in significant yield losses, reduction of number of heads and tillers per plant. canopy dry matter was also reduced. infestations of two and 10 aphids per plant resulted in continuous yellowing of wheat plants from tillering to the end of flowering stage. when aphids fed for seven days on wheat, more yellowing symptoms were observed at the flower stage in comparison with two days feeding.
Finite element modeling of food cooking
Olivera,D. F.; Salvadori,V. O.;
Latin American applied research , 2008,
Abstract: in the last few years there has been an evident rise in the production of previously cooked, ready-to-serve meals. at a global level, the studies on this matter have yet to develop. heat (and mass) transfer are modeled to predict thermal histories, microorganisms destruction and, finally, the cooking time. both the experimental and modeling problems are quite complex, due to an important contribution of the radiation in the oven to the heat transfer and the simultaneous water loss by means of evaporation, porosity and volume variation, crust formation, etc. nowadays the modeling of the process is carried out using finite differences or finite elements, contemplating important simplifications. to simulate the cooking of different foods in a convection oven, a commercial finite elements software (algor) is used. the three-dimensional mesh of finite elements is formed using "brick" elements, proper of the algor software heat transfer module. the thermal variable properties of the food are considered, including the specific apparent heat, which involves the evaporation of water in the superficial crust. the convective and radiation components of the heat transfer in the air-food system are also taken into account. this is done with heat transfer coefficients determined in specific experiments for the utilized oven. the obtained results are validated against experimental data, from cooking runs of the same foods in the determined oven.
On the return period and design in a multivariate framework
G. Salvadori, C. De Michele,F. Durante
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2011,
Abstract: Calculating return periods and design quantiles in a multivariate environment is a difficult problem: this paper tries to make the issue clear. First, we outline a possible way to introduce a consistent theoretical framework for the calculation of the return period in a multi-dimensional environment, based on Copulas and the Kendall's measure. Secondly, we introduce several approaches for the identification of suitable design events: these latter quantities are of utmost importance in practical applications, but their calculation is yet limited, due to the lack of an adequate theoretical environment where to embed the problem. Throughout the paper, a case study involving the behavior of a dam is used to illustrate the new concepts outlined in this work.
Finite element modeling of food cooking
D. F. Olivera,V. O. Salvadori
Latin American applied research , 2008,
Abstract: In the last few years there has been an evident rise in the production of previously cooked, ready-to-serve meals. At a global level, the studies on this matter have yet to develop. Heat (and mass) transfer are modeled to predict thermal histories, microorganisms destruction and, finally, the cooking time. Both the experimental and modeling problems are quite complex, due to an important contribution of the radiation in the oven to the heat transfer and the simultaneous water loss by means of evaporation, porosity and volume variation, crust formation, etc. Nowadays the modeling of the process is carried out using finite differences or finite elements, contemplating important simplifications. To simulate the cooking of different foods in a convection oven, a commercial finite elements software (ALGOR) is used. The three-dimensional mesh of finite elements is formed using "Brick" elements, proper of the ALGOR software heat transfer module. The thermal variable properties of the food are considered, including the specific apparent heat, which involves the evaporation of water in the superficial crust. The convective and radiation components of the heat transfer in the air-food system are also taken into account. This is done with heat transfer coefficients determined in specific experiments for the utilized oven. The obtained results are validated against experimental data, from cooking runs of the same foods in the determined oven.
Multivariate design via Copulas
G. Salvadori,C. De Michele,F. Durante
Hydrology and Earth System Sciences Discussions , 2011, DOI: 10.5194/hessd-8-5523-2011
Abstract: Calculating return periods and design quantiles in a multivariate framework is a difficult problem: essentially, this is due to the lack of a natural total order in multi-dimensional Euclidean spaces. This paper tries to make the issue clear. First, we outline a possible way to introduce a coherent notion of multivariate total order, and discuss its consequences on the calculation of multivariate return period: in particular, the latter is based on Copulas and the Kendall's measure, which provides a consistent notion of multivariate quantile. Secondly, we introduce several approaches for the identification of critical design events: these latter quantities are of utmost importance in practical applications, but their calculation is yet limited, due to the lack of a suitable theoretical setting where to embed the problem. Throughout the paper, a case study involving the behavior of a dam is used to illustrate the new concepts outlined in this work.
Injúrias de quatro espécies de percevejos pentatomídeos em plantulas de milho
Roza- Gomes, Margarida Flores;Salvadori, José Roberto;Pereira, Paulo Roberto Valle da Silva;Panizzi, Ant?nio Ricardo;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011005000081
Abstract: injuries caused by the stink bugs dichelops furcatus (f.), nezara viridula (l.) and euschistus heros (f.), compared with dichelops melacanthus (dallas), to corn (zea mays l.) seedlings were studied. the experiment was conducted in a greenhouse in a completely randomized design with five treatments (four species of stink bugs and control, without infestation) using eight replications. in the vegetative stage (v1 to v3) d. melacanthus, at the density of one adult/plant, caused reduction in height, in the number of expanded leaves, in root dry matter, and caused injuries and winding of the central leaves. d. furcatus, e. heros and n. viridula caused injuries, but at different intensities. injuries caused by d. furcatus and n. viridula were similar in intensity to those by d. melacanthus and the injuries caused by e. heros were less intense than those of the other species.
SAXS Structural Characterization of Nanoheterogeneous Conducting Thin Films. A Brief Review of SAXS Theories
M. Cattani,M. C. Salvadori,F. S. Teixeira
Physics , 2009,
Abstract: The SAXS (small angle X-ray scattering) technique has been used to determine the fundamental structure of conducting thin films fabricated by implanting gold ions into PMMA (polymethylmethacrylate) polymer. We present a brief review of the SAXS theories necessary to determine the structural properties of our nanoheterogeneous films.
Comments on the Radial Distribution Functions and Structure Factors of Aggregates: Fractal and Non-Fractal Approaches
M. Cattani,M. C. Salvadori,F. S. Teixeira
Physics , 2010,
Abstract: The definitions and applications of Radial Distribution Function (RDF) and Structure Factor (SF) to study properties of aggregate are found in many papers and books. The approach adopted to calculate the RDF and the SF to determine the interaction potential between particles of an aggregate is very different from that adopted to obtain their fractal properties. The difference between the two approaches will be shown in details here. This article was written to graduate and postgraduate students of Physics
Filippo Bruni, Blog e Didattica. Una risorsa del web 2.0 per i processi di insegnamento. Macerata: EUM (2009)
Ilaria Salvadori
Form@re : Open Journal per la Formazione in Rete , 2013,
Abstract:
Cosa sappiamo circa l’efficacia della LIM nel contesto scolastico?
Ilaria Salvadori
Form@re : Open Journal per la Formazione in Rete , 2013,
Abstract: Il presente contributo si sofferma sulle evidenze relative all’efficacia della lavagna interattiva multimediale nel contesto didattico, allo scopo di individuare potenzialità e rischi connessi al suo impiego. La letteratura internazionale presa in considerazione mostra una serie di affordances comprovanti una sostanziale utilità della LIM nell’insegnamento e apprendimento con esempi di esperienze didatticamente valide, in modo particolare per la lingua straniera inglese. Tuttavia, questi studi sono stati di tipo prevalentemente qualitativo e non sono emerse prove a dimostrare con certezza il raggiungimento di obiettivi formativi mediante l’uso delle LIM. In sostanza non si può affermare che gli apprendimenti realizzati con questi strumenti tecnologici siano migliori e più duraturi rispetto a esperienze condotte in modo tradizionale. Gli effetti positivi, quando rilevati, derivano più da un’aneddotica descrizione generica di benefici riportata da insegnanti e studenti che da ricerche basate su evidenze scientificamente fondate. Studi di tipo quantitativo e meta-analisi, per valutare gli effetti prodotti nell’apprendimento e individuare cosa funzioni in ambito educativo, rilevano dei limiti nell’impiego degli strumenti tecnologici in genere e non sono stati ancora ampiamente effettuati per le lavagne interattive multimediali.
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