Dissertations / Theses on the topic 'Modèle de Sabra'
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Fontaine, Côme. "Etude de deux modèles simplifiés de turbulence à l'aide du groupe de renormalisation fonctionnel : l'équation de Burgers et le modèle de Sabra." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALY083.
In this thesis, we focus on two simplified models describing turbulent flows. In these two models, the turbulent state exhibits scale-invariance and universal statistical properties resembling those of true hydrodynamical turbulence. This type of behaviour is very familiar in physics: it corresponds to a critical system. In this work, we use a widely used tool in the study of criticality: the functional renormalisation group (FRG). The first model, named the Sabra shell model, describes effective interactions among a discrete number of velocity modes of a turbulent fluid. This schematic description captures many essential properties of turbulent flows. In particular, the velocity field is multifractal. The way in which the dynamics generates this multifractality is still poorly understood from a theoretical perspective. In this thesis, we formulate a reverse renormalisation flow, meaning that we integrate out the largest scales first. Using this method, we find a fixed point of the renormalisation flow with anomalous scale invariance, relatively close to the expected value for certain observables. We show that it is clearly distinct from the fixed point obtained when all scales are forced, through a forcing with a power-law spectrum, which corresponds to the fixed point of the RG obtained in perturbation theory. The second model studied is the Burgers equation, which describes the dynamics of a fluid in the absence of pressure. We focus on the effect of a conservative noise on the velocity field. We prove the existence of a scale invariant regime with a critical dynamical exponent z=1 using an exact closure of the renormalisation flow equation. This closure relies on the existence of certain symmetries of the Burgers equation. Indications of the existence of this new scaling regime were previously found in numerical solutions of the Burgers equation. We provide in this thesis a theoretical proof of its existence and calculate the associated universal properties
Mbongo, Nkounga Jeffrey Ted Johnattan. "Building Interest Rate Curves and SABR Model Calibration." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96965.
ENGLISH ABSTRACT : In this thesis, we first review the traditional pre-credit crunch approach that considers a single curve to consistently price all instruments. We review the theoretical pricing framework and introduce pricing formulas for plain vanilla interest rate derivatives. We then review the curve construction methodologies (bootstrapping and global methods) to build an interest rate curve using the instruments described previously as inputs. Second, we extend this work in the modern post-credit framework. Third, we review the calibration of the SABR model. Finally we present applications that use interest rate curves and SABR model: stripping implied volatilities, transforming the market observed smile (given quotes for standard tenors) to non-standard tenors (or inversely) and calibrating the market volatility smile coherently with the new market evidences.
AFRIKAANSE OPSOMMING : Geen Afrikaanse opsomming geskikbaar nie
Sjöstrand, Maria. "En kvantitativ undersökning av SABR-modellen." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-7644.
För att prissätta optioner är val av modell en viktig fråga. I denna kandidatuppsats
beskrivs både Black & Scholes modell och SABR-modellen. Förstnämnda modell är
enklare än SABR-modellen men bygger på antaganden som inte stämmer överens med
verkligheten. Den ger heller inte någon explicit formel för den implicita volatiliteten
och predikterar inte heller på ett korrekt sätt fenomenet volatility smile vilket
observeras på marknaden.
Syftet med uppsatsen är att utvärdera prestandan hos SABR-modellen och
användarvänligheten, samt att undersöka lite av teorin bakom modellen och vissa av
dess egenskaper. Till grund för beräkningarna ligger datamaterial hämtat från Nasdaq
OMX Nordic.
Enligt mina beräkningar är resultatet att SABR-modellen endast presterar marginellt
bättre än Black & Scholes-modellen. Dock kan även små förbättringar spela stor roll i
dessa sammanhang.
Osman, Sara [Verfasser]. "The Mediator kinase module: structural and functional studies in transcription regulation / Sara Osman." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://d-nb.info/1219731757/34.
Soler, Cecilia Manuela Tojo. "Uso do modelo Ceres-Maize para previsão de safra do milho "safrinha"." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/11/11143/tde-09112004-164934/.
The objectives of the present work were: 1) to study the phenology and development of four maize hybrids: AG9010, DAS CO32, Exceler and DKB 333B sown off-season in Piracicaba region, State of São Paulo, Brazil; 2) to calibrate and test the CERES-Maize model to estimate the productivity and development for the four maize hybrids sown off-season for the mentioned region; 3) to apply the model for determination of sowing dates with less risk, for irrigated and rainfed conditions, for the four maize studied hybrids; 4) to apply the CERES-Maize model for long term climatic conditions aiming yield forecast; 5) to verify the association between climatic parameter and ENSO phases (El Niño Southern Oscillation) for Piracicaba region; 6) to analyze the influence of ENSO phases in maize productivity. Three field experiments that included four hybrids with different maturity durations were conducted during the autumn and winter growing seasons of 2001 and 2002 at the Escola Superior de Agricultura Luiz de Queiroz, University of São Paulo, in Piracicaba, SP, Brazil. One experiment was conducted in 2001 under irrigated conditions, and two experiments were conducted in 2002, one under rainfed and another under irrigated conditions. All experiments had a randomized complete block design. The maize hybrids used in this study were: AG9010 (very short season), DAS CO32 and Exceler (short season) and DKB 333B (normal season). The sowing dates were March 15th, for the 2001 experiment, and March 13th, for the 2002 experiments. CERES-Maize model was calibrated and tested with data obtained in these experiments. The results suggested that maize sown off-season under rainfed conditions, presented in general, lower values of LAI, plant height and less dry matter accumulation than under irrigated conditions. An increase in root water uptake on deep layers of the soil was evident on maize crop under soil water limitations conditions. The CERES-Maize model simulated with accuracy the maize phenology and yield for off-season conditions. In general, for the two cropping systems, irrigated and rainfed, as more delayed the planting date is, less simulate yield for the four hybrids. The CERES-Maize was an excellent tool for maize off-season yield forecast using climatic historic data combined with data from the year of study. This procedure permitted to obtain a good estimation of yield 45 days before harvest for the hybrids sown off-season in Piracicaba. The ENSO phases had influence on maize sown off-season yield, as result of the precipitation patterns during April and May months. The highest yields were simulated for El Niño years, being higher than yields for La Niña years, which were higher than for neutral years.
He, Ping. "NOVEL EXPERIMENTAL APPROACHES AND THEORETICAL MODELS FOR IMPROVING SENSITIVITY AND INFORMATION CONTENT OF NMR AND MRI SPECTROSCOPY." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/dissertations/757.
Webber, Caroline. "A survey and implementation of some calibration algorithms for the SABR and Heston models." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/8518.
This thesis surveys and implements some calibration methods for the SABR and Heston models. Hagan (2002) examined the effect of the SABR parameters on the skew in order to determine which parameters may be redundant. Hagan andWest (2005) found that by fixing one of the parameters in the SABR model, the remaining parameters were stable over time. We implement a SABR calibrator to confirm that the parameters are stable over time. We then examine the effects of the five Heston parameters on the skew in order to determine if any of the parameters are redundant. Calibrators where some parameters have been fixed and calibrators where no parameters have been fixed are implemented. The performance of these calibrators is then compared based on three criteria: the stability of the parameters over time, the fit of the solution and the computational efficiency of the calibrator. We find that the Heston parameters are more stable if the redundant parameters are fixed, the computation time is less and the fit is slightly worse. All implementations are done in the context of the South African market. The calibrators are programmed in Matlab and the code is included in the appendix.
Resende, Severino Miranda de. "Modelo para estimar a relação entre áreas ocupadas com soja e milho na safra de verão paranaense." Florianópolis, SC, 2003. http://repositorio.ufsc.br/xmlui/handle/123456789/86120.
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O presente trabalho desenvolveu um instrumento com base em regressão linear múltipla, cuja finalidade é estimar a relação entre duas áreas plantadas com culturas concorrentes. O estudo teve como foco o Paraná e a escolha recaiu sobre o cultivo da soja e do milho, principal prática na safra de verão neste Estado. Na identificação das variáveis mais influentes, o modelo contou com o emprego de uma pesquisa exploratória envolvendo pessoas do ramo agrícola e com informações de fontes especializadas. As estimativas obtidas pelo instrumento idealizado, comparadas a valores correlatos já conhecidos, mostram dentro de suas limitações, atender as expectativas esperadas. Desta forma os resultados permitem concluir sobre a viabilidade de sua utilização e da importância que a modelagem matemática pode proporcionar como ferramenta de apoio no contexto de um processo produtivo. The present brainwork has developed an instrument based on the multiple linear regression, whose purpose is to estimate the relation betuween two planted grounds whit rival cultivation. The study has had the state of Paraná as its anter of interest ande chice has fallen back to the soy and corn cultivaition which was the main practice in the summer crop in that state. In the identification of the most variable influents, the model hás counted on the application of na exploiting research involving people in the agricultural branch and with information of specialized sources. The achieved estimations by the idealized instrument, compared whith the abready known correlated values, try to attend the prospective expectations inside its limitations prospective expectations. That way the results allow to conclude the viability of its utilization and importance that the mathematics shape may provide as a support tool in the context of a produtive process.
Mendonça, Leandro de Freitas. "Acurácia da seleção simultânea para caracteres de interesse em milho tropical de segunda safra." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/11/11137/tde-04052016-094154/.
Second growing season maize, also known as winter maize, is the maize sowed in Brazil between January and March. This growing modality reached 9.18 million hectares in 2013/2014, higher than the area cultivated in first growing season that was 6.61 million hectares in the same period. In the second season, there is a high risk of climate instabilities, mainly due to low temperatures, frost, poor rainfall distribution and reduction of photoperiod. All these factors harm photosynthetic activity, reducing the maize yield. However, because of the recent plant area increasing, public, private companies and universities have sought increased yield and stability of the second growing season maize. For this, some traits are mainly in the selection process. With the high risk of yield loses due to environmental adversities, many farmers have done little investment in fertilizers, especially nitrogen fertilization. In this context, the development of plants that are nitrogen use efficient and nitrogen stress tolerant could result in a safer activity for the farmers. In addition, the earliness is highly important, since early materials reduce the risk of losses during this period. However, the earliness must always be associated with a high yield. This way, simultaneous selection of these traits can be made by per se responses indexes of stressed plants, graphical analysis and simultaneous selection indexes. Additionally, the genotypic values of the genotypes for the traits can be predicted not only by REML/BLUP single-trait (univariate analysis), but also by REML/BLUP multi-trait (multivariate analysis). In the second, the genotypic values are adjusted considering the covariance between the traits. This way, the objective of this study was to investigate the possibility of simultaneous selection for nitrogen use efficiency and nitrogen stress tolerance, as well as early and high yielding plants. For this, tropical maize lines were grown and evaluate. By these data, it was simulated several simultaneous selection sets. It was observed that Harmonic Mean of the Relative Performance (HMRP) is the most efficient in the selection for nitrogen use efficient and nitrogen stress tolerance. This probably occurs due to the strong unfavorable correlation between the indexes that estimate the efficiency and the tolerance, as well as the superiority in accuracy, heritability and selections gains of HMRP. In case of simultaneous selection for yield and earliness, the additive simultaneous selection index using the genotypic values predicted by REML/BLUP single-trait proved the most efficient selection, because it got satisfactory gains in all the traits and, this index allows the possibility to modulate the gains in each trait. It was concluded that the simultaneous selection for nitrogen use efficiency and nitrogen stress tolerance, as well as for yield and earliness are possible. Furthermore, the choice of the best simultaneous selection method depends on the magnitude and direction of the correlation between the traits.
Anjos, Franklin Alves dos. "Simulação de produtividade de milho em diferentes épocas de semeio em Arapiraca, Alagoas, pelo modelo AquaCrop." Universidade Federal de Alagoas, 2011. http://repositorio.ufal.br/handle/riufal/235.
Fundação de Amparo a Pesquisa do Estado de Alagoas
O milho (Zea mays L.), devido a sua importância na dieta alimentar humana e animal, é uma das culturas mais difundidas no mundo. No Brasil, é cultivado em praticamente todas as regiões, devido a isto, tem sido foco da modelagem agrometeorológica por décadas. O modelo AquaCrop foi utilizado nesse trabalho com o objetivo de simular a produção de biomassa total e diária, produtividade de grãos, bem como obter a previsão de safra do milho para região de Arapiraca, Alagoas. O modelo usa a cobertura do dossel (CD), em vez do índice de área foliar (IAF), como base para calcular separadamente a transpiração das plantas e a evaporação da água do solo. A produtividade é calculada como o produto da biomassa e do índice de colheita (IC). Os dados de entrada do modelo foram de experimento realizado por Medeiros (2008), no povoado Batingas no município de Arapiraca-AL. Para as quatro épocas de semeio, os resultados do armazenamento de água no solo simulados pelo modelo AquaCrop apresentaram tendência de variação similar aos valores observados. Porém, para terceira época de semeadura o armazenamento observado apresentou valor máximo (171,66 mm) aos 35 DAE, enquanto que o valor máximo simulado (115,0 mm) ocorreu aos 24 DAE. Para a produção de biomassa final (kg ha-1) os valores máximos e mínimos observados (simulados) variaram entre 13.059 (11.861) e 9.873 (8.306) para 3ª e 4ª época de semeadura, respectivamente. A produtividade de grãos simulada foi entre 4.406 e 2.069 kg ha-1, para a 3ª e 4ª época de semeadura, subestimando em 2,0% (3ª ES) e superestimando em 5,1 % (4ª ES). A superestimativa da 4ª época de semeadura deve-se ao ajustamento da profundidade do sistema radicular em 0,75 m, em que para as demais épocas de semeadura a profundidade considerada foi 0,60 m (MEDEIROS et al., 2008). O modelo AquaCrop é uma ferramenta para previsão da produtividade de milho da variedade AL Bandeirante. Esse procedimento permite obter adequada estimativa do rendimento de grãos com 18 dias de antecedência à colheita na região do Agreste Alagoano, disponibilizando aos usuários finais do modelo programar o armazenamento, logística e comercialização da safra de grãos a ser colhida.
Villot, Clothilde. "Recherche d'indicateurs périphériques de l'acidose ruminale subaiguë chez la vache laitière." Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAC089/document.
In ruminants, subacute ruminal acidosis (SARA) is a nutritional disease that induces an abnormal acidity of the rumen compartment as well as disturbance in microbial fermentation. When the disease becomes chronic, it can lead to negative effects on production efficiency and animal health at the individual or the herd scales, with negative economic consequences for the farmer. One of the major problems of SARA is that there are no obvious clinical signs. Presently, the only benchmark to define SARA is rumen pH. However, no pH indicator is unanimous due to the important variability related both to the measurement technique itself and to the animal susceptibility. In this context, this thesis aimed to improve the individual diagnosis of SARA in dairy cows by developing a multiparametric approach that could be used on field. We propose new indicators of pH kinetics measured noninvasively with intra-ruminal boluses. These new relative indicators, calculated daily (kinetic normalised on 0, NpH), consist of the time spent under NpH < - 0.3, the NpH standard deviation and the NpH range. These indicators make it possible to overcome the strong sources of variability and have the advantage of being transposable while being more accurate to characterize SARA. At the same time, we have developed multiparametric models including a number of parameters measured simultaneously in various biological compartments (milk, faeces, saliva, blood, urine) or on animal behaviour. The models ability to predict SARA has been evaluated on field. Some models including rumen peripheral parameters (concentration of urea in milk, of bicarbonate in blood, salivary pH) have a proficient sensitivity while others have a proficient specificity (number of drinking acts, faecal pH, and urea concentration in milk). However, no model developed is both sensitive and specific enough. The diagnostic strategy we propose is based on 4 steps: 1) analysis of the SARA diagnostic context, 2) assessment of risk factors, 3) evaluation of multiparametric models and (4) determination of ruminal NpH indicators for individuals presenting a high risk of SARA
Gutiérrez, Canales Marco Antonio. "“Análisis desde la gestión estratégica al modelo del servicio de prevención y detección temprana del cáncer del cuello uterino en el distrito de Marcabamba, provincia Paúcar del Sara Sara, Región Ayacucho, 2016”." Master's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/10046.
In this 21st century, Cervical Cancer is second in incidence in the world and is the most common in women in developing countries. The highest rates have been found in Sub-Saharan Africa, South Asia, the Caribbean and Latin America (Norma Técnico Oncológica para la Prevención, Detección y Manejo de Lesiones Premalignas del Cuello Uterino a Nivel Nacional, 2007). Peru has not been unaware of this reality, as it is the leading cause of death in Peruvian women (League Against Cancer, 2016) and to control its incidence has developed Public Health Policy on Prevention and Control of Cervical Cancer, based on international agreements, conventions (Cairo, 1994, World Conference on Human Rights, 1993, etc.) and Sustainable Development Goals be completed in 2030. This research carried out in the Ayacucho Region aims to identify Factors that Limit the Implementation of Model of Prevention and Early Detection of Uterine Cervical Cancer (PAP Examination) to women in rural areas of the district of Marcabamba, in the province of Páucar Sara Sara, Ayacucho Region; and analyze Strategic Management's elements to propose measures that improve access to this service in the Health Center, 2016. The research is qualitative - descriptive and aims to identify Total Quality Management (Human Potential Management, Logistic Management and Social Marketing), Confidence Management and Service Management in the Territory in the Implementation of Model of Prevention and Early detection of cervical cancer (PAP examination); And, from this, to propose improvements to the management of the processes of the model studied. Finally, Strategic Management, axis of the Social Management, allows the objective population to access efficiently and adequately the service or product offered by the Public Sector Industry, such as the Early Cervical Cancer Prevention and Detection Model (PAP Examination); and, in that way, allow them to exercise their citizens' rights.
Tesis
Argenton, Paulo Eduardo. "Influências das variáveis edafoclimáticas e de manejo no rendimento de variedades de cana-de-açúcar (Saccharum spp.) na região de Piracicaba, São Paulo." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11136/tde-04042007-140457/.
The sugarcane culture (Saccharum spp.) has a major importance today, because it is used to produce two important commodities, sugar and alcohol. In this context, the development and adoption of modern management tools, like models of production prediction used to elaborate scenarios are of great importance and utility in a production site because they make possible to predict the yields of specific varieties with high credibility what makes the production plan easier. This dissertation had as goals the construction of mathematical models of yield prediction of eight sugarcane varieties, in function of soil water balance, incoming heat sum and yield of earlier cuts stratified by environmental and crop management features. In order to do so, it was used the datawarehouse of a production site which is Usina Costa Pinto in Piracicaba, state of São Paulo. As results, several mathematical models were calculated and were statistically significant, what leads us to the conclusion that these models may be used to predict the yield of the considered varieties and conditions, exception made to the varieties RB 85-5035 in the crop management sites C and D (R2 was 0,1592**) and SP 80-1816 in the crop management sites A and B (R2 was 0,1274**). However the yield of the earlier cuts explained the greatest part of the variations causes in the models, and, as a consequence they reduced solely in the models the influence of soil water balance and incoming heat sum. There are several variables that were not used in the models like soil compression levels, type of harvest and levels of pests and weeds, and that occurred because the initial hypothesis was that only soil water balance and incoming heat sum stratified by environmental and crop management features would be enough to explain the major causes of variations. It is possible to conclude that the variables studied in this research work are mathematically proven in the models to be important and to affect the yield of sugarcane. This is a very important point because rather than finding a immediate way to use the models it was found that the models are functional and can be improved and that there is a major opportunity to include the variables that were identified but not considered in this work.
Miquelluti, Daniel Lima. "Métodos alternativos de previsão de safras agrícolas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-06042015-153838/.
The agriculture is, historically, one of Brazil\'s economic pillars, and despite having it\'s importance diminished with the development of the industry and services it still is responsible for giving dynamism to the country inland\'s economy, ensuring food security, controlling inflation and assisting in the formation of monetary reserves. In this context the agricultural crops exercise great influence in the behaviour of the sector and agricultural market balance. Diverse crop forecast methods were developed, most of them being growth simulation models, however, recently the statistical models are being used due to its capability of forecasting early when compared to the other models. In the present thesis two of these methologies were evaluated, ARIMA and Dynamic Linear Models, utilizing both classical and bayesian inference. The forecast accuracy, difficulties in the implementation and computational power were some of the caracteristics utilized to assess model efficiency. The methodologies were applied to Soy production data of Mamborê-PR, in the 1980-2013 period, also noting that planted area (ha) and cumulative precipitation (mm) were auxiliary variables in the dynamic regression. The ARIMA(2,1,0) reparametrized in the DLM form and adjusted through maximum likelihood generated the best forecasts, folowed by the ARIMA(2,1,0) without reparametrization.
CAVENAGO, MARCO. "ARTE SACRA IN ITALIA: LA SCUOLA BEATO ANGELICO DI MILANO (1921-1950)." Doctoral thesis, Università degli Studi di Milano, 2021. http://hdl.handle.net/2434/829725.
In October 1921, the Beato Angelico Higher School of Christian Art was born in Milan. Responsible for the initiative: Don Giuseppe Polvara, the architect Angelo Banfi, the painter Vanni Rossi, flanked by the sculptor Franco Lombardi, by the priests Adriano and Domenico Bernareggi, by the engineer Giovanni Dedè, by professor Giovanni Mamone and by the lawyer Carlo Antonio Vianello . There were nine pupils in the first school year, two of whom (the architects Don Giacomo Bettoli and Fortunato De Angeli) destined to remain in the School for many years as teachers: this also happened with the painter Ernesto Bergagna, who enrolled the following year. Starting from that event, the Italian context of sacred art was able to count on an element of indisputable novelty, destined within a few years to a rapid, widespread and stubborn affirmation in the Peninsula. The foundation of the Beato Angelico School put a stop to the age-old debate on the general decline of sacred art that had been staged for a long time in Italy as well as in major European countries. The formula conceived by Don Polvara put his personal, artistic and professional experiences into a system with the knowledge of the international context, some exemplary models and the comparison with groups and individual figures (artists, critics, men of the Church) animated by the common desire to contribute to the rebirth of sacred art. One hundred years after its birth - and seventy after the death of its founder - the Beato Angelico School (with the workshops of Architecture, Cesello, Embroidery, Painting and Restoration) still continues in the task of serving the Church through the creation of distinctive sacred furnishings and vestments. from a particular care of the artistic and liturgical aspect, object of repeated attestations of merit and acknowledgments in the ecclesiastical sphere. What is missing from the appeal so far is an organic attempt to reconstruct the historical events that marked the genesis and developments of this singular artistic and religious reality. The purpose of this thesis is therefore the return of a profile as detailed and reasoned as possible of the history of the Beato Angelico School, such as to bring this story back to the center of a historical situation and a complex cultural context, through an original work perspective conducted on thread of clarifications and rediscoveries. Given the "pioneering" nature of this research, the vastness of the materials and sources available and the consequent need to assign a recognizable chronological cut to the work, it was decided to limit the survey to the decades between 1921 and 1950, or between the foundation of Beato Angelico and the death of Giuseppe Polvara. As will be seen, the initial term is in a certain sense anticipated by the need to better outline the background and context from which the School originates (between the end of the 19th and the first decades of the 20th century). The year assumed at the end of the research, on the other hand, seemed an almost obligatory choice, coinciding with the first change in the direction of Beato Angelico as well as the desire to exclude from the discussion what started in the 1950s and 1960s, that is a new and different season in the field of sacred art (destined, among other things, to pass through the junction represented by the Second Vatican Council and by the action of St. Paul VI), which is however much investigated by historical-artistic studies. What made the drafting of this thesis possible is the fact that it relies, in large part, on unpublished archival materials or, at least, never examined before in a structured way. Access to the most historicized archive materials and their consultation (thanks to the availability shown by the direction of the Beato Angelico School) have decisively conditioned the discussion of the topics, the reconstruction of which, in some cases, is supported exclusively by documents found. The birth of the Beato Angelico School was not an isolated event in the panorama of European artistic production of the time nor an episode unrelated to what was being debated in the ecclesiastical world at the same time. The Polvara School was born in an era marked by great ecclesial ferment: think of the Ateliers d'Art Sacré founded by Maurice Denis and George Desvallières in Paris in 1919, only two years before the Milanese School, whose adherents - all lay people - they professed an intense and devoted religiosity. But, above all, the decisive and best known model by Polvara was the Beuron School (Beuroner Kunstschule), born in the homonymous German Benedictine abbey in the last quarter of the nineteenth century by father Desiderius Lenz and on whose example workshops specialized in the production of sacred art (furnishings and vestments for liturgical use) in many Benedictine communities in central Europe. Polvara's affinity with Benedictine spirituality is a key element of the School he founded: in fact, the (analogous) concept of "represented prayer" (orando labora) derived from the rule of the ora et labora. The very organization of the School, set up as in an ideal medieval workshop where teachers, apprentices and pupils collaborate and coexist, takes up the monastic lifestyle of the Benedictine monasteries. Precisely in order to preserve the character of the medieval workshop as much as possible, the number of students admitted to the School was never too high, so as to maintain an adequate and effective numerical ratio between disciples and masters. Again, from Beuron Fra Angelico drew the particular and unmistakable graphic form of the letter "e", recognizable in the numerous and long epigraphs present in many of his works. The last element in common between the Milanese and the German schools - but which can be attributed to the more general fascination for the medieval era - is the unity of purpose that must animate all the workers involved in creating a collective and anonymous work ad maiorem. Dei gloriam, where the contribution of the single author remains deliberately hidden in favor of the name of the School. What still differentiates the School from similar centers of production of sacred art is the fact that it rests its foundations on a religious congregation, the Beato Angelico Family, an idea long cultivated by Polvara and officially approved by the diocesan authority between the thirties and forties. From the common vocation to sacred artistic creation (the artist's "priestly mission") descend the practice of community life, the participation in the sacraments and the various daily moments of prayer by master priests, brothers and sisters artists, apprentices, pupils and pupils . The spiritual direction traced by the founder for his family still acts today as a guarantee of a strenuous fidelity in the continuity of a unique artistic and liturgical project, put into practice by a community of men and women linked together by the canonical vows of poverty, chastity. and obedience but above all from a common and higher intent. Precisely to ensure a prospect of survival and future development of his creature, Polvara always had a clear need to keep the training aspect (and therefore the teaching for students, adolescents and young people) united with that of production (due to the work of collaboration between teachers, apprentices and students). From an operational point of view, the artistic disciplines, practiced in the various laboratories in which the School is divided, contribute, without any exception and in the aforementioned anonymous and collective form, to create an organic and unitary artistic product, a "total work of art" which must respond to the address given by the master architect (Polvara himself), to whom devotion, respect and obedience are due. The architectural design is therefore assigned great importance and this means that the best representative works of the Beato Angelico School are those sacred buildings entirely made with the intervention of its laboratories for all or almost all the decorations, furnishings, furnishings and Milanese churches of S. Maria Beltrade, S. Vito al Giambellino, S. MM. Nabore and Felice, or the church of S. Eusebio in Agrate Brianza and the chapel of the religious institute of the daughters of S. Eusebio in Vercelli). As for the expressive languages used by the School (the so-called "style"), the preference for modern architectural rationalism is highlighted - a topic of stringent topicality, to which Polvara did not fail to give his personal theoretical and practical contribution - and that for Divisionism in painting, indebted to the ancient admiration for the work of Gaetano Previati. The interaction of these two forms gives rise to a recognizable language, modern and spiritual at the same time, verifiable in the buildings as in the individual works, the result of a profound sensitivity that combines the thoughtful recovery of some forms of the past (for example early Christian iconography reused in the decorative motifs of the vestments or in the shape of some artifacts, from the chalice to the tabernacle, to the chasuble-chasuble) with the impetus for a modern and functional style appropriate to the times but respectful of tradition.
Duarte, Yury Catalani Nepomuceno. "Modelos de simulação da cultura do milho - uso na determinação das quebras de produtividade (Yield Gaps) e na previsão de safra da cultura no Brasil." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-15052018-104958/.
Maize is the most important cereal cultivated in the world, being its production system very complex and its productivity directly affected by climatic and crop management factors. In order to quantify the impacts caused by water and crop management deficits on maize yield, the use of crop simulation models is very useful. For properly apply these models, a solid basis of meteorological data is required. In this sense, the present study had as objectives: i) to evaluate two meteorological gridded data, NASA-POWER and DailyGridded, by comparing them with measured data from surface stations; (ii) to calibrate, evaluate and combine the MZA-FAO, CSM DSSAT Ceres-Maize and APSIM-Maize simulation models to estimate the maize potential and attainable yields in Brazil; iii) to evaluate the impact caused by the different sowing dates and soil types on maize yield; iv) to develop and evaluate a crop forecasting system based on crop simulation models and climatological data; v) to map the potential and the attainable maize yields in Brazil, identifying the most suitable regions for cultivation, and vi) to determine and map maize yields and yield gaps (YG) in Brazil. Comparing the gridded climatic data with observed ones, on a daily basis, a good agreement was found for all weather variables, including rainfall, with R2 = 0.58 and d = 0,85. The performances of the combination of the models at the end of the calibration and evaluation phases were better than those obtained with the individual models, with relatively low mean absolute error (EAM = 627 kg ha-1) and with good precision (R2 = 0.62) and accuracy (d = 1.00). During the evaluation of different sowing dates and soil types on maize yield, it was observed that this variable depends on the region and presents the maximum values and, consequently, the minimum risk during the sowings in the beginning of the rainy season of each site. The crop forecasting system, based on crop simulation models, had its best performance for simulating maize yields when the sowings were performed at the beginning of the main season and at the end of the second season, when it was able to predict yield satisfactorily 25 days before harvest. For the YG analysis, 152 sites were assessed and their potential and attainable yields were compared to the actual yields reported by IBGE. The highest YGs caused by water deficit occurred for sandy soils and during the autumn and winter months, usually dry in most of Brazilian regions, reaching values above 12000 kg ha-1. For YG caused by crop management, the values were higher in the less technified regions, such as in the North and Northeast regions, with values above 6000 kg ha-1. In contrast, more traditional maize production regions, such as the South and Center-West, presented YG caused by crop management, lower than 3500 kg ha-1 in most cases.
Volpe, Márcia Souza. "Estudo de três estratégias de ventilação artificial protetora: alta freqüência, baixa freqüência e baixa freqüência associada à insuflação de gás traqueal, em modelo experimental de SARA." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5160/tde-11082010-102833/.
Introduction: One of the major goals in ARDS is to find the best protective mechanical ventilation strategy, which minimizes lung stress and optimizes gas exchange. Theoretically, these two goals can be accomplished by simultaneously avoiding alveolar overdistension and cyclic collapse of unstable alveolar units. Pushing further the rationale of this strategy, two new strategies have been proposed: high frequency oscillatory mechanical ventilation (HFOV) and intra-tracheal gas insufflation (TGI) associated with permissive hypercapnia and conventional frequencies. Objective: To determine which of the three protective modalities of mechanical ventilation, HFOV, low-frequency-protective ventilation (LFV), or LFV associated with tracheal gas insufflation (TGI), was the most protective strategy in an ARDS rabbit model during six hours of mechanical ventilation. Material and methods: The animals (n = 45) were submitted to repeated saline lavage until PaO2 < 100 mmHg. Immediately after lung injury, a P/V curve was obtained to calculate inspiratory/expiratory work and energy dissipated during lung inflation. Thereafter, the animals were randomized into one of three groups: LFV, HFOV or TGI. The optimal PEEP or PMEAN was obtained during a PEEP/PaO2 (or PMEAN/PaO2) curve which was preceded by a recruiting maneuver. The animals of the LFV and TGI groups were initially ventilated in PCV with diving pressure = 8 cmH2O and frequency = 60 b/m. The only initial difference between these two arms was that the TGI group had a continuous tracheal flow = 1 L/min. The animals in the HFOV were initially ventilated with an oscillatory pressure amplitude = 45 cmH2O and frequency = 10 Hz. All animals were ventilated with FiO2 = 1.0. Driving pressure was then adjusted in LFV and TGI groups to maintain a PaCO2 = 90-110 mmHg, while in HFO the pressure amplitude was adjusted to maintain a PaCO2 = 45-55 mmHg. At the end of the experiment, after 6 hours of ventilation, another P/V curve was obtained. BAL and bloods samples were drawn before and after the period of ventilation to determine IL-8 levels. The left lung was processed for histological analysis and for wet weight/dry weight (ww/dw) ratio. Results: We observed no differences in PaO2 among the groups. PaCO2 was significantly lower at HFO (59 ± 3 mmHg) when compared with LFV (99 ± 4 mmHg) and TGI (80 ± 3 mmHg) groups. Tidal volume was significantly lower in TGI and HFO groups when compared with LFV group. Soon after injury, all groups required similar energy for lung inflation (inspiratory work), but the VP group was the only one not presenting any improvement in this parameter after 6 hours (P<0.001). Concerning the expiratory work, the VP strategy was the only one presenting an increase in the expiratory work along the 6 hours (P<0.001). The TGI and HFOV groups showed the highest polymorphonuclear cell concentration in lung tissue (P=0.008) and trends towards a higher surface/volume index (P=0.14), higher IL8 gradient (difference between IL8 in BAL and plasma) and lower ww/dw ratio at the end of 6 hours of ventilation (P=0.17). Discussion: The lower energy for lung inflation after six hours of ventilation reflected the reduction of opening pressures and better surfactant function during ventilation under TGI and HFOV strategies. The increase in expiratory work during the VP strategy further suggests that the surfactant quality deteriorated under this strategy. In the TGI and HFOV groups, the higher concentration of polymorphonuclear cells and the trend towards a higher IL8 gradient between the lung and blood may suggest a better integrity of the alveolar-capillary membrane, leading to less release of compartmentalized mediators within the alveolar space. Besides the higher tidal volumes used during VP, this strategy required inspiratory pressures progressively higher along the hours, due to frequent and necessary adjustments of tidal volumes or pressures according to the gas-exchange requirements. Conclusion: An aggressive reduction of tidal volume and driving pressures was beneficial during protective strategies, even when an optimization of lung recruitment was already in place. The TGI strategy showed to be an attractive alternative to HFOV, presenting some advantages in terms of implementation and predictability of response.
Tyler, Ayana Diane. ""It takes a village to raise a child - It takes a campus to graduate a student" Exploring the Cultural Relevance of Student Development Models for African Americans in Higher Education." Master's thesis, Temple University Libraries, 2012. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/171863.
Ed.M.
This paper presents a synthesis of the literature related to cultural identity and college student development among African Americans in higher education. Racial and cultural identities for African American college students are an integral part of their student development and have been connected to a variety of positive outcomes such as succeeding in college. Currently, traditional student development models and theories, once considered applicable to all students, are being challenged on the grounds that they are not culturally sensitive. Furthermore, the diversification of the philosophical foundation of higher education is also being challenged on the grounds that its foundation is also based in one dominant worldview. Subsequently, the classical student development literature as well as the philosophical foundation of higher education is being disputed on the grounds that its theories have been generalized to all student populations from samples that were predominantly White, male, and middle class. The guiding question of this work seeks to uncover if an African American college student's racial identity can truly be accommodated and achieved at a university which utilizes college student development models based solely in a European framework. Both Eurocentric and Afrocentric models are discussed and suggestions on how to integrate Afrocentric worldviews into higher education are made.
Temple University--Theses
Lausch, Sara [Verfasser], Ingo Wolfram [Gutachter] Kleiter, and Aiden [Gutachter] Haghikia. "Einfluss prophylaktischer und therapeutischer Anwendung eines ZNS-gängigen niedermolekularen P2X7R Antagonisten im murinen Modell der experimentellen autoimmunen Enzephalomyelitis / Sara Lausch ; Gutachter: Ingo Wolfram Kleiter, Aiden Haghikia ; Medizinische Fakultät." Bochum : Ruhr-Universität Bochum, 2021. http://d-nb.info/1239418914/34.
Berçott, Flávio Márcio. "Avaliação de sistemas eletrônicos de informação mediante uso de conceitos de estudos de usuário : um modelo aplicado no sistema eletrônico de informação do paciente da Rede Sara de Hospitais." reponame:Repositório Institucional da UnB, 2000. http://repositorio.unb.br/handle/10482/30519.
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Os sistemas eletrônicos de informação têm passado por mudanças devidas à evolução tecnológica, transformando-os em bases de informação geradoras de conhecimento. Com efeito, essas mudanças têm alterado a forma de avaliar esses sistemas. A partir da definição de variáveis representativas - Revocação, Precisão, Amicabilidade da Interface, Urgência, Confiança, Seletividade e Evolucionariedade -, propõe-se uma metodologia de avaliação de sistemas eletrônicos de informação mediante a aplicação de um estudo de usuários. Também realiza a aplicação prática do modelo no sistema de informação médico da Rede Sarah de Hospitais. Conclui-se, com isso, que a metodologia desenvolvida mostrou-se capaz de atingir os objetivos e que pode servir como base para o planejamento de estudos futuros.
Technological transformations nave fostered deep changes in electronic information systems, turning them into knowledge-engendering ones. Besides, the transformations nave shifted traditional assessment methods designed to evaluate electronic information systems. This work proposes a new methodology for assessing such systems, based on the definition of representative variables as well as an user survey. It also tests the model in the medicai information system of Sarah Hospitais Network. Results demonstrate that the methodology proved to be efficient in reaching the designed goals set by the researcher. Consequently, it can be applied in future studies.
Ruccius, Sara [Verfasser], Henning [Akademischer Betreuer] Ebelt, Kuno [Akademischer Betreuer] Hottenrott, and Juliane [Akademischer Betreuer] Stieber. "Der Einfluss von Endotoxin auf die Herzfrequenz und Herzfrequenzvariabilität bei Wildtyp-Mäusen : ein Modell der kardialen autonomen Dysfunktion bei Intensivpatienten mit Multiorgan-Dysfunktions-Syndrom (MODS) / Sara Ruccius ; Henning Ebelt, Kuno Hottenrott, Juliane Stieber." Halle, 2016. http://d-nb.info/1123071500/34.
Ruccius, Sara Verfasser], Henning [Akademischer Betreuer] Ebelt, Kuno [Akademischer Betreuer] [Hottenrott, and Juliane [Akademischer Betreuer] Stieber. "Der Einfluss von Endotoxin auf die Herzfrequenz und Herzfrequenzvariabilität bei Wildtyp-Mäusen : ein Modell der kardialen autonomen Dysfunktion bei Intensivpatienten mit Multiorgan-Dysfunktions-Syndrom (MODS) / Sara Ruccius ; Henning Ebelt, Kuno Hottenrott, Juliane Stieber." Halle, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:3:4-19093.
Alvarado, patino Nelson Andrey. "Évaluation des performances thermomécaniques des enrobés bitumineux à fort taux de recyclage : Apport du procédé de régénération Fenixfalt." Thesis, Rennes, INSA, 2018. http://www.theses.fr/2018ISAR0021/document.
An experimental programme has been performed on three types of bituminous mixes with variable recycling rates and the possible addition of rejuvenator. The mix composition and the production process have been defined in order to perform a comparative analysis. The coating process modifies the physico-chemical parameters of the binders, like consistency, glassy transition temperature, cristallizable moiety, aromatics and asphaltenes rates; the above variations are limited by using the rejuvenator. As the RAP content increases, the compactibility and the rutting of the mixes decrease and the viscoelastic stiffness increases, but the rejuvenation reduces these variations. Globally, RAP increases the fatigue resistance of the mixes and flattens the Wöhler curve. Rejuvenation enhances ɛ6 fatigue parameter; fatigue performances increase with R&B temperature and colloidal index of the binder and as the viscous component of the mixes decreases. The positive impact of a high rate of RAP and of the rejuvenation on the allowable traffic has been evaluated from the structural design of a threelayered pavement. At low temperature, the deterioration of the tension ductility and of the stress restrained failure temperature produced by the RAP, is limited by the rejuvenation; a compromise with the fatigue resistance has to be found. The rejuvenated mixes laid as surface layers on a provincial road have experienced a smaller evolution that non rejuvenated mixes
Pagliarani, Stefano. "Portfolio optimization and option pricing under defaultable Lévy driven models." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423519.
In questa tesi studiamo alcuni problemi di portfolio optimization e di option pricing in modelli di mercato dove le dinamiche di uno o più titoli rischiosi sono guidate da processi di Lévy. La tesi é divisa in quattro parti indipendenti. Nella prima parte studiamo il problema di ottimizzare un portafoglio, inteso come massimizzazione di un’utilità logaritmica della ricchezza finale e di un’utilità logaritmica del consumo, in un modello guidato da processi di Lévy e in presenza di fallimenti simultanei. Nella seconda parte introduciamo una nuova tecnica per il prezzaggio di opzioni europee soggette a fallimento, i cui titoli sottostanti seguono dinamiche che prima del fallimento sono rappresentate da processi di Lévy esponenziali. Nella terza parte sviluppiamo un nuovo metodo per ottenere espansioni analitiche per i prezzi di derivati europei, sotto modelli a volatilità stocastica e locale guidati da processi di Lévy, espandendo analiticamente l’operatore integro-differenziale associato al problema di prezzaggio. Nella quarta, e ultima parte, presentiamo un estensione della tecnica precedente che consente di ottenere espansioni analitiche per i prezzi di opzioni asiatiche, ovvero particolari tipi di opzioni il cui payoff dipende da tutta la traiettoria del titolo sottostante.
Shafaq, Saba [Verfasser]. "Flavor physics and right handed models / vorgelegt von Saba Shafaq." 2010. http://d-nb.info/1008727091/34.
"Computational issues of Stochastic-Alpha-Beta-Rho (SABR) model." 2013. http://library.cuhk.edu.hk/record=b5884377.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2013.
Includes bibliographical references (leaves 95-100).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese.
Majmin, Lisa. "Local and Stochastic Volatility Models: An Investigation into the Pricing of Exotic Equity Options." Thesis, 2006. http://hdl.handle.net/10539/1495.
The assumption of constant volatility as an input parameter into the Black-Scholes option pricing formula is deemed primitive and highly erroneous when one considers the terminal distribution of the log-returns of the underlying process. To account for the `fat tails' of the distribution, we consider both local and stochastic volatility option pricing models. Each class of models, the former being a special case of the latter, gives rise to a parametrization of the skew, which may or may not re°ect the correct dynamics of the skew. We investigate a select few from each class and derive the results presented in the corresponding papers. We select one from each class, namely the implied trinomial tree (Derman, Kani & Chriss 1996) and the SABR model (Hagan, Kumar, Lesniewski & Woodward 2002), and calibrate to the implied skew for SAFEX futures. We also obtain prices for both vanilla and exotic equity index options and compare the two approaches.
Dieterich, Maike [Verfasser]. "Untersuchungen zur renalen Regulation des Endothelinsystems und zur nephroprotektiven Wirkung von Darusentan im Modell der salzsensitiven hypertensiven Sabra-Ratte / von Maike Dieterich." 2007. http://d-nb.info/984332839/34.
Bourbotte, Asensio Juan Manuel. "Caracterización de la función de SARA durante el desarrollo neuronal y regeneración axonal en un modelo in vitro de neuronas sensoriales." Bachelor's thesis, 2022. http://hdl.handle.net/11086/23496.
El desarrollo de las neuronas requiere la coordinación entre procesos intrínsecos y señales microambientales, finamente regulados, para producir la especificación y crecimiento axonal. En ese sentido, la vía de señalización de TGFβ actúa en el sistema nervioso modulando distintos procesos durante la diferenciación neuronal, tales como establecimiento de la polaridad y extensión de las neuritas. A su vez, se ha evidenciado que TGFβ influye en la regeneración axonal de manera contexto-dependiente, aunque a la fecha su participación en dicho proceso ha sido poco caracterizado en el sistema nervioso periférico (SNP). SARA es una proteína involucrada en tráfico y señalización, que facilita la interacción entre Smad 2/3 y el receptor de TGFβ, y se ha reportado que contribuye a la neurogénesis del sistema nervioso central (corteza e hipocampo), modulando la actividad de la vía de TGFβ. Sin embargo, no se ha descripto si SARA participa en el desarrollo del SNP. En ese contexto, la hipótesis de este trabajo es que SARA participa en el desarrollo y regeneración axonal de neuronas sensoriales de DRG regulando la señalización de TGFβ. En un modelo in vitro de DRG embrionarias demostramos que la supresión de SARA promueve el crecimiento axonal, y el mismo fenotipo se adquiere al estimular exógenamente la vía de TGFβ. Asociado a esto, determinamos que la expresión endógena de SARA incrementa de manera dependiente a la activación de la señalización, y la inhibición del receptor TβRI (con SB431542) produce efectos diferenciales entre neuronas DRG e hipocampales. Por otro lado, en un modelo de DRG postnatales demostramos que TGFβ estimula la regeneración de las neuritas y modifica la morfología de los conos de crecimiento. Además, el agregado de TGFβ incrementa la expresión de SARA, y aumenta el número y distribución de los endosomas SARA a nivel del soma y axones. Paralelamente, el inhibidor del TβRI produce una alteración en los niveles endógenos y distribución de los endosomas SARA. En síntesis, nuestros resultados sientan las bases, y aportan evidencia por primera vez, sobre la participación de SARA y su implicancia en la vía de señalización de TGFβ en el crecimiento y regeneración axonal del SNP.
Fil: Bourbotte Asensio, Juan Manuel. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina.
Fil: Bourbotte Asensio, Juan Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación Médica Mercedes y Martín Ferreyra; Argentina.