Browsing by Issue Date, starting with "2023-04-14"

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Listas de cabeçalhos de assunto e tesauros: discussões e iniciativas à luz da justiça social e equidade
(Universidade Federal de São Carlos, 2023-04-14)
Silva, Fabíola Rubim
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Dal'Evedove, Paula Regina
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https://lattes.cnpq.br/1170937498266968
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https://lattes.cnpq.br/3470862820521303
The research aimed to describe initiatives for creating and updating subject headings list and thesaurus considering justice and social equity, based on literature on the sociocultural dimension of the Organization of Knowledge. To achieve this objective, three specific objectives were proposed: to map scientific discussions on subject headings list and thesaurus in the sociocultural dimension of the Organization of Knowledge, to present these discussions and highlight initiatives focused on justice and social equity based on the available literature. The research, of an applied nature, adopts a qualitative approach, making use of systematic literature mapping as a methodological procedure to achieve the established objectives. The study identifies discussions on the representation of different social groups in subject headings list and thesaurus. Criticisms are identified regarding the structure and terminology used in traditional systems, which reflect a historical privilege for a masculine, Euro-American, heterosexual, white, and Christian perspective. The mapped recommendations highlight collaboration with communities to promote fair and equitable representation and propose the implementation of local changes to incorporate terms used by people to refer to themselves, include terms representative of local culture and minority social groups, and use friendly and democratic language. Regarding initiatives, the research identifies 27 initiatives for creating and updating subject headings list and thesaurus focused on social justice and equity. Eight initiatives for gender, eight for indigenous groups, five for queer groups, five for race and ethnicity, and one for diverse groups are identified. The research identifies successful initiatives for creating and updating subject headings list and thesaurus to promote social justice and equity, especially those focused on indigenous communities. However, limited access to some of these systems is considered a barrier to expanding the reach of initiatives. The research concludes by defending the incorporation of institutionalized mechanisms for requesting and monitoring the revision of terms, aiming at transparency and accountability of institutions in promoting inclusion and diversity in SOC.
Projeto, montagem e teste de um subwoofer ativo
(Universidade Federal de São Carlos, 2023-04-14)
Silva, Wellngton Corrêa de Faria
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De Francisco, Carlos Alberto
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https://lattes.cnpq.br/1246572405382250
;
https://orcid.org/0000-0001-6472-5957
The present work describes in detail the development and construction of an active bass reproduction system "subwoofer". For this, it uses a TPA3255 integrated circuit. This class D amplifier has two outputs that are applied to each of the two 4 Ω coils of the BRAVOX-P12X-D4 loudspeaker, which has a nominal power of 220 WRMS. In addition, the system has adjustment features (volume control, phase inversion and adjustable low-pass filter) and protection (against overvoltage, overcurrent and filters). All circuits were mounted on printed circuit boards and their operation was evaluated through performance measurements. A comparison of the costs involved in the project in relation to the commercialized models was also carried out.
Desenvolvimento de um amplificador de áudio de alto desempenho utilizando realimentação negativa global
(Universidade Federal de São Carlos, 2023-04-14)
Ferreira, Roni Henrique Cardoso
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De Francisco, Carlos Alberto
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https://lattes.cnpq.br/1246572405382250
;
https://orcid.org/0000-0001-6472-5957
;
https://orcid.org/0000-0002-1847-8251
This paper proposes the development of a high-performance audio amplifier with global feedback. The proposed topology is based on "A design methodology for audio amplifiers with no global negative feedback: proposal and validation" Visintin et al. (2022) in order to compare the approaches of amplifiers with and without global negative feedback. A 50W power amplifier is designed and built. In this project example, three stages are used with field effect transistors operating with a symmetrical voltage of ±55V. The practical results obtained satisfied the design requirements, such as: Slew Rate above 1.13V/us (4.2V/us), upper cutoff frequency above 40kHz (250kHz), THD+N below 0, 5% (0.0296%). In this way, it was possible to develop an amplifier with global negative feedback and the objective of this work was achieved.
Análise de um amplificador de áudio padrão
(Universidade Federal de São Carlos, 2023-04-14)
Boldrin, Vinícius José
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De Francisco, Carlos Alberto
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https://lattes.cnpq.br/1246572405382250
;
https://orcid.org/0000-0001-6472-5957
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https://lattes.cnpq.br/9540694539079697
This work analyzes and assembles the 50W "Blameless" audio amplifier designed by Douglas Self in his book. The three stages of the amplifier, the feedback loop, and the mechanisms used to minimize distortion were studied. Only components available domestically were used, leading to modifications of some components from the original design. The prototype proved to be in line with Self's vision, demonstrating satisfactory performance in terms of distortion.
O Shopping Center Iguatemi Esplanada no limite das divisas intermunicipais e as consequências na produção do espaço urbano
(Universidade Federal de São Carlos, 2023-04-15)
Forti, Marina Machado
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Silva, Carlos Henrique Costa da
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https://lattes.cnpq.br/5444248390841543
;
https://orcid.org/0000-0003-2910-6602
;
Lana, Rita de Cássia
The dissertation regards the impacts from demarcation lines placement in city limits between Sorocaba and Votorantim inside Shopping Center Iguatemi Esplanada mall. Approaches the analysis of mall business as a relevant commerce model, with its characteristics and contribution for structuring of urban networks. The study encompasses brief historical facts around the relationship between Sorocaba and Votorantim and the lawsuit which questioned intercity limits. Concerning the development and production of urban space, it directed towards the impacts of taxes and collection, public management and the expansion of urban sprawl. At the end of the work, it was analyzed the unfolding of the situation of division of the mall business between two cities with the advent of the pandemic caused by COVID-19. For elaboration of this work was done a documental revision, and a bibliography revision of the Geography, promoting interdisciplinarity with areas from Law and Sociology. As a result, it was observed a formalization of the agreement and the existence of split and collaborative management between two cities, recognized by mall business.
A cobertura florestal e o tipo ambiental moldam a diversidade funcional de aves insetívoras dentro da Mata Atlântica do sudeste brasileiro
(Universidade Federal de São Carlos, 2023-04-17)
Manzoli, Enzo Coletti
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Ribeiro, Milton Cezar
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https://lattes.cnpq.br/4158685235743119
;
https://orcid.org/0000-0002-4312-202X
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Piratelli, Augusto João
Arthropod-eating birds are a heterogeneous group, with different levels of environmental sensitivity and diverse responses to habitat degradation. In this paper, we tested the effects of landscape on the functional diversity of insectivorous birds within the Brazilian Atlantic Forest. We predict that (I) species composition and functional diversity are shaped by turnover and nestedness across different habitats, and (II) the gradient of forest cover has a positive effect on bird species composition and functional diversity. We used data from 22 landscapes of the Atlantic Forest in the Cantareira-Mantiqueira region (Brazil), within buffers of 1 km radius, surrogating three types of environments (i.e., forests, pastures, and marshes). The components of β-functional diversity were calculated using the beta pair and beta multi-function for each type of environment, and the effects of the forest cover gradient and environment type were tested using linear models and GLMM, respectively. Our results showed that the forest cover gradient and the type of environment had a negative effect on the indices of functional diversity, contrary to our expectations. Pasturelands and marshes were susceptible to turnover and nestedness, respectively. The beta diversity of forests was influenced by both species nestedness and turnover. The regional native forest fragments are generally small-sized, and in early successional stages, which could explain the patterns we found. The presence of secondary forests may have affected the expected pattern of functional diversity, therefore, caution is needed when interpreting this, since the way in which compensatory dynamics may not involve real functional compensation.
Forma escolar dos aldeamentos jesuíticos do século XVI
(Universidade Federal de São Carlos, 2023-04-18)
Melo, Jéssica Cristine de
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Ferreira Junior, Amarilio
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https://lattes.cnpq.br/0748545841167046
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https://lattes.cnpq.br/5707668618318378
The present research consists of the study of the Jesuit settlements of the 16th century, spaces dedicated to the conversion and education of the Indians. Therefore, the aim is to understand the school form used in these places, where individuals were confined and disciplined to form docile bodies, a concept developed by the author Michel Foucault, in his book Discipline and Punish: The Birth of the Prison. For the understanding of the concept of school form, this investigation resort authors such as Guy Vincent, Bernard Lahire and Daniel Thin, who discuss this concept from a historical approach. This research is based on the qualitative paradigm, because presents a theoretical design substantiated on analysis of Jesuit letters and documents prepared by the Society of Jesus, along with studies by researchers who write about Jesuit education, including historians, anthropologists, education specialists. It can be understood that the school form corresponds to a mode of socialization, which is configured according to some assumptions, such as a specific space, its own pedagogy, in addition to organization through rules and schedules. Thus, the results indicate that the Jesuits, in the referred settlements, considering their customs (rules, schedules, disciplinary pedagogies) and traditions of the catholic faith and European principles, acted in the mission of converting and educating the indigenous people, so that could turn them into catholics and subjects of the king.
Identificação do leito regular de cursos d’água com técnica geobia aplicada a imagens de ultra alta resolução espacial
(Universidade Federal de São Carlos, 2023-04-18)
Almeida, Bruna Felix de
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Melanda, Edson Augusto
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https://lattes.cnpq.br/1554762456965991
;
https://orcid.org/0000-0002-9298-0637
;
https://lattes.cnpq.br/6372533808357565
The processes of occupation of the territory by man, in a disorderly way, cause changes in land use that impact the environment and the life of the population. The consequence of these appropriations interferes not only with the landscape, but also with the hydrological cycle of the rivers, due to the permeability of the soil and deforestation around the water courses, directly affecting the availability and quality of this resource. In this sense, laws and regulations were implemented to improve the monitoring of the territory and water resources. In the Brazilian context, the current Forest Code – Law No. 12,651/2012 stands out, which provides for Permanent Preservation Areas (APPs), whose environmental function includes the protection of rivers and also the fauna and flora. According to the aforementioned Law, APPs are delimited based on the width of the edge of the regular river bed. However, the correct delimitation of the edge of the aforementioned gutter is not well defined in the current Forest Code, presenting subjectivity, which compromises the preservation and conservation of these resources. In this sense, there is a global trend in the use of Remote Sensing (RS) for environmental and urban monitoring, highlighting the acquisition by sensors on board Remotely Piloted Aircraft (RPA). Therefore, the classification techniques of these images have also evolved, with emphasis on the Image Analysis Based on Geographical Objects (GEOBIA). Considering these aspects, the objective of this work was to delimit the edge of the regular bed of a stretch of watercourse located in the Monjolinho sub-basin, in the municipality of São Carlos - SP. For that, images obtained with the use of RPA and subsequent application of the GEOBIA technique were used. The research methodology began with a previous analysis of the rainfall seasonality in the municipality, since according to the current Forestry Code, the channel of the regular bed of a river is defined by “the channel through which the waters of the watercourse run regularly during the year”, therefore, it is necessary to visualize the minimum flow of the river, that is, the periods of little rain. Then, the planning of field activities, aerial survey and image processing were carried out, in order to obtain the orthomosaics of the periods of high and low rainfall and later apply GEOBIA, followed by the validation of the results, through the field truth and application of the Kappa Index (IK). As a result of this project, first the orthomosaics were obtained, referring to the aerial surveys carried out in the months of March and September, high and low pluviometry respectively, followed by the elaboration of the maps by manual vectorization, and later application of GEOBIA, this step consisted in the execution of the segmentation, feature extraction, sample collection and finally the classification through the decision tree algorithm. The validation of the results demonstrated a satisfactory classification through GEOBIA with Kappa Index values of 0.6682 and 0.7102 for the periods of high and low rainfall, a fact corroborated by the Accuracy values of 0.8382 and 0.8727 for both periods respectively. The values found indicate that for the period of low rainfall the riverbed was better delimited. Therefore, the results of this research can serve as a basis for public and private agencies, where there is a need to monitor water resources, for the purposes of preserving the APP.
Atitudes implícitas de estereótipos de gênero de mulheres praticantes de rúgbi
(Universidade Federal de São Carlos, 2023-04-18)
Tardeli, Lara de Azevedo
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Picoli, Ricardo Marinho de Mello de
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https://lattes.cnpq.br/9960736226025843
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Reis, Maria de Jesus Dutra dos
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https://lattes.cnpq.br/8868678989340770
Based on a feminist perspective of Behavior Analysis and on the assumption that sport is na enable of empowerment, this study aimed to investigate whether the practice of rugby by women, being a sport culturally practiced by men, contributes to the reduction of gender bias - compared to practitioners of other sports and non-practitioners of sports - using a measure of implicit attitudes of gender stereotypes. Thirty women participated in the research, divided in three groups: the experimental group, composed by ten women rugby players, and two control groups: one composed by ten women not practicing sports and the other by tem women practicing sports in which female participation is historically considered more accepted. A Sociodemographic Questionnaire was applied, the Athletic Identity Measurement Scale (AIMS) to investigate Athletic Identity, and the Function Acquisition Speed Test (FAST) to access implicit attitudes of gender stereotypes. The results of the FAST were analyzed by comparing the FAST Effect between groups of participants (experimental and control groups). No significant differences were found in the comparison between groups regarding gender bias. The results are discussed and future investigations suggested.
Currículo de matemática na Educação Infantil de um município do interior paulista: compreensão de número e sistema de numeração
(Universidade Federal de São Carlos, 2023-04-19)
Torres, Valmir Rogério
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Calzolari Neto, Anselmo João
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https://lattes.cnpq.br/4906309581958797
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https://orcid.org/0000-0002-6703-9079
;
https://lattes.cnpq.br/6155106609363315
This research presents an analysis of the Curriculum of the Municipal Education Network of Limeira, more specifically the part related to early childhood education. Its purpose is to verify how the contents related to mathematics, numbers and the numbering system are presented in this teaching stage. For this purpose, the conceptions of teaching-learning, student, teacher, curriculum itself and its characteristics were initially analyzed. The analyzes were carried out based on legal documents and Census data, aiming to demonstrate the evolution of early childhood education and its importance for the educational process and for the progress of society. Regarding the functionality of the teaching-learning process, progressive and liberating theories were used, which focus on the development of critical and participatory citizens, relating learning to their social context, based on the theories of Vygotsky, Rogoff and Paulo Freire. In the same way, a vision of curriculum was adopted that does not have the purpose of serving as social control, adopting Apple's propositions. With regard to mathematics, a historical view was adopted and the use of multiple intelligences with contributions from the theories of Smole, Boyer and Mezscach. In methodological terms, scientific research was used to support this work, based on document analysis and Bardin's content analysis technique, which allowed selecting points in the analyzed document that could be discussed to achieve the research objectives. Among the results presented, there was a lack of scientific research on the knowledge of newborn babies and the need to propose educational actions that consider the child's reality and social context.
Efeito da redução de comportamento sedentário associado ao treinamento multicomponente na composição corporal de idosos: ensaio clínico randomizado controlado
(Universidade Federal de São Carlos, 2023-04-19)
Lee, Stefany
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Takahashi, Anielle Cristhine de Medeiros
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https://lattes.cnpq.br/8336705133403404
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https://orcid.org/0000-0003-1263-2833
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https://lattes.cnpq.br/5720440002978457
Introduction: Body composition changes occur in the aging process leading to an increase in fat mass and a decline in lean mass. Physical exercise can cause changes in body composition, but it is unclear whether reducing sedentary behavior (SB) also produces positive effects. Objective: To assess whether adopting self-management strategies (SMS) associated with a multicomponent training compared to a multicomponent training alone can improve the body composition of older adults who were physically active before the pandemic. Methods: A single-blind, randomized, controlled clinical trial was performed. Forty-five older adults were divided into two groups: Multi and Multi+SMS. The Multi (aerobic, muscular resistance, balance and flexibility) lasted 16 weeks (3x week, 50 minutes/session). The SMS consisted of goals and weekly telephone follow-up calls. Body composition was assessed by dual-energy X-ray absorptiometry (DXA) and the time spent in SB using the ActivPAL3™ accelerometer. A generalized mixed linear model was performed (fixed factors: time, group and interaction and random factor: subjects). Results: Both groups reduced time in SB, increased lean mass index, reduced the fat mass index and fat mass percentage. There was no change in the appendicular lean mass index. Conclusion: SMS to reduce SB did not potentiate the effects of Multi on the body composition of older adults. Offering physical exercise programs to older adults who have similar characteristics to those in our study may be enough to reduce SB and improve their body composition.
Biorreator da 5’-deoxi-5’-metiltioadenosina fosforilase: do desenvolvimento a aplicação em ensaios de afinidade
(Universidade Federal de São Carlos, 2023-04-19)
Rodrigues, Juliana Gomes
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Cass, Quezia Bezerra
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https://lattes.cnpq.br/9197210255594409
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https://lattes.cnpq.br/3527738525140248
5'-deoxy-5'-methylthioadenosine phosphorylase (MTAP) is an enzyme present in many organisms, including the parasite Schistosoma mansoni, which causes schistosomiasis. The classic MTAP enzymatic assay is coupled to the reaction of another enzyme and indirectly measures adenine formation. The main disadvantage of these coupled assays is that any interference in the activity of the second enzyme directly affects the activity of the main enzyme. Therefore, an LC-UV chromatographic method was developed and validated to directly monitor the catalytic activity of MTAP in the conversion of adenosine substrate into adenine. The enzyme was covalently linked to the surface of magnetic particles, to obtain a bioreactor that was applied in the screening of molecules in extracts of natural products, through the affinity selection mass spectrometry technique. For this purpose, the test known as ligand fishing was developed and applied to prospect for ligands in methanolic extracts of the marine sponge Topsentia ophiraphidites and the stem bark of Aspidosperma macrocarpon. Among the Feature-Based Molecular Networking, the MZmine software was used for the processing and interpretation of the fingerprint chromatograms obtained by LC-HRMS of the assay. Subsequently, the Ichthus software was used to align the molecular characteristics, calculate the affinity ratio and thus distinguish the selective ligands for the enzyme. The binders were inspected manually through analyzes in the chemical profile of the extracts of natural products and in the blank sample, to discard the artifacts. After selection, the ligands were submitted to the dereplication process with the support of platforms such as GNPS and databases such as Dictionary of Natural Products, KNApSAcK Core System, MassBank, PubChem, SciFinder, LIPID MAPS and HMDB.
Visitação carcerária e sua manifestação em municípios turísticos: o caso em São Vicente (SP)
(Universidade Federal de São Carlos, 2023-04-19)
Farias, João Paulo Bloch
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Silva, Carlos Henrique Costa
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https://lattes.cnpq.br/5444248390841543
;
https://orcid.org/0000-0003-2910-6602
;
https://lattes.cnpq.br/7565122228040383
En las ciudades donde están ubicadas las unidades penales de São Paulo, es posible identificar la dinámica espacial que se presenta cuando llegan los familiares de los presos. Lo que llamamos turismo socio-familiar penal, corresponde al desplazamiento de visitantes con el propósito de visitar a sus familiares condenados. La intención de esta investigación a nivel de maestría pretende analizar geográficamente cómo ocurren las visitas presenciales en las unidades penales de São Vicente/SP e identificar los detalles de este fenómeno en un municipio preparado para el turismo, donde también alberga un sistema penitenciario. Para responder a los objetivos en mente, el método utilizado para obtener los datos fue investigación bibliográfica, combinada con análisis documental, realizado a través de material puesto a disposición por organismos públicos, específicamente el gobierno del estado. Además de la técnica netnográfica en un grupo de visitantes en Facebook. Posteriormente, con la flexibilización del virus COVID-19, fue posible realizar la observación directa y la aplicación de 16 cuestionarios en la puerta de la unidad penal en los momentos previos al ingreso de los familiares. La ocurrencia del turismo socio-familiar penal puede ser abarcada por la geografía, pues esta ciencia posee metodologías que permiten la lectura del espacio, de la movilidad espacial y de los sujetos que contribuyen a cambiar los territorios. Se encontró en la teoría de los dos circuitos de la economía urbana, en especial el circuito inferior, una forma de entender la realidad penal, por lo que en cuanto a los resultados obtenidos se muestran datos inéditos que describen cómo se comportó el fenómeno durante la pandemia del COVID-19 y las reproducciones espaciales en los alrededores de la unidad que ocurrieron principalmente los fines de semana. Concluimos que existen prestadores de servicios en los alrededores del complejo penal, que encuentran oportunidades en este flujo y así, ofrecen servicios como: venta de alimentos y ropas exclusivas (jumbo). Observamos también el desinterés de los visitantes, compuestos en su mayoría por mujeres, en no buscar y/o participar de actividades de ocio en el local, aún estando en un destino turístico.
Eletrodeposição de ligas de Ni-W sobre aço carbono: caracterização dos filmes
(Universidade Federal de São Carlos, 2023-04-19)
Zacarin, Maria Gabriela
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Carlos, Ivani Aparecida
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https://lattes.cnpq.br/1666217445807782
;
https://orcid.org/0000-0003-4878-9381
;
https://lattes.cnpq.br/6122251297187148
The electrodeposition of Ni-W alloy on steel substrate from acid and alkaline solution containing NTA as a complexing agent for Ni2+ and WO4 2- ions was initially studied. EDX analyzes of the galvanostatically produced films found that from the complex formed between Ni-NTA there was no unloading of Ni2+ ions and, therefore, there was no alloy formation. Therefore, studies of the Ni-W alloy were conducted in acidic and alkaline ion solutions in the presence of aspartic acid, which complexes the Ni2+ ions, and also from the acid solution containing the boric acid-sorbitol complex from which the Ni2+ remains free in solution. The complexation of Ni2+ ions with aspartic acid shown in the species distribution diagram was evidenced by the results obtained in the UV-Vis and in the potentiometric titration. The voltammetric analyzes of the tested solutions observed that the increase in the nickel concentration in the deposition bath, pH variation and variation in the composition of the deposition bath did not influence the control of the reduction process of the Ni-W alloy. SEM analysis of the Ni-W electrodeposits produced with qd = 40.00 C cm-2 showed that the films were smooth, cracked or had globular crystallites depending on the composition of the bath and the deposition current density (jd) studied. EDX analyzes of the Ni-W electrodeposits found that the W content varied with the jd studied and with the composition of the deposition bath. The XRD analyzes indicated, in general, that the solid solution of W in Ni was designed independently of the deposition bath and the jd, and also through XRD analysis, the calculated grain size showed that the W content presented in the films evolved in different grain sizes. The testicles of adhesion of the films visited that, for the most part, the Ni-W films had good adhesion to the steel substrate. Open circuit potential (Eca) studies as well as polarization studies have found that Ni-W films protect steel from corrosion
Impactos macroeconômicos sobre a formação de bolhas especulativas no mercado agropecuário brasileiro
(Universidade Federal de São Carlos, 2023-04-20)
Cabrine, Carlos Guilherme das Neves
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Silva Júnior, Geraldo Edmundo
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https://lattes.cnpq.br/5138808982229139
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Cruz Júnior, José César
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https://lattes.cnpq.br/0086426315229286
The volatility in commodity prices has direct implications for the financial results of companies and consumers. Not infrequently, such variations occur in a sharp way, and in non-compliance with market fundamentals, that is, in a speculative way. When this occurs, the effects on agents' expectations are even greater, as it negatively affects the price discovery and hedging processes. The main objective of the work is to identify the occurrence of speculative bubbles in the prices of selected commodities, also trying to determine the reason for the existence of such movements. For this, we used daily price series of the three most liquid commodities (feeder cattle, corn, coffee) traded on the Brazilian commodities and futures exchange market, B³, as well as macroeconomic variables (interest rate, exchange rate, economic activity index, money supply as a percentage of the GDP, stock index Bovespa, brazilian consumer price index), for the period between 2013 and 2021. The Generalized Supreme Augmented Dickey-Fuller (GSADF) and Backward Supreme Augmented Dickey-Fuller (BSADF) tests were used to detect and datestamp the explosive periods in prices, and the Poisson regression model for inspection and understanding of the determining macroeconomic factors in the formation of bubbles. As a result, slightly explosive processes were found in all commodities for the analyzed period, although infrequent. Concerning the macroeconomic effects, money supply, stock index and inflation had a positive impact on the emergence of bubbles, while interest rates and economic growth had negative effects.
Bayesian estimation of dynamic mixture models by wavelets
(Universidade Federal de São Carlos, 2023-04-20)
Motta, Flávia Castro
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Montoril, Michel Helcias
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https://lattes.cnpq.br/9993502064983663
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https://lattes.cnpq.br/8392595039676608
Gaussian mixture models are used successfully in various statistical learning applications. The good results provided by these models encourage several generalizations of them. Among possible adaptations, one can assume a dynamic behavior for the mixture weights to make the model more adaptive to different data sets. When estimating this dynamic behavior, wavelet bases have emerged as an alternative. However, in the existing literature, the wavelet-based methods only estimate the dynamic mixing probabilities, failing to provide estimates for the component parameters of the mixture model. In this work, we propose two approaches based on orthonormal wavelets to estimate the dynamic mixture weights under efficient MCMC algorithms that allows us to estimate the component parameters from their posterior samples. We use simulated and real data sets to illustrate both approaches' performances. The results indicate that the proposed methods are promising and computationally efficient alternatives for estimating jointly the dynamic weights and the component parameter of two Gaussian mixtures.
Gestão da informação e do conhecimento em núcleo de Economia Solidária
(Universidade Federal de São Carlos, 2023-04-20)
Pereira, Vinicius
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Silva, Sergio Luis da
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https://lattes.cnpq.br/4164265591178698
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Furnival, Ariadne Chloe Mary
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https://lattes.cnpq.br/1291482506649810
Solidarity Economy presents a new collective way of production and consumption through property and work reorganization, disrupting economic, social and cultural paradigms, aiming for better social welfare and sustainable development. In this context, solidarity economy incubators support these initiatives through actions such as consultancies and interventions, fomenting social innovation through knowledge use. In Information Science, such organizations are still under-explored, especially regarding how they manage their knowledge and information, and how the literature relates to their particular context. Therefore, this research aims to analyze the Information and Knowledge Management (KIM) of the Integrated Multidisciplinary Nucleus of Studies, Formation and Intervention in Solidarity Economy (NUMI-EcoSol) of the Universidade Federal de São Carlos (UFSCar) as a case study, which included direct observation, document analysis and semi-structured interviews. Results point toward a knowledge intensive KIM of emergent nature, in a multidisciplinary and dialogical environment, where the incubation method presents characteristics of a non-structured competitive intelligence. Decision making is processual and dialogical, where decision-making spaces are the main knowledge transfer opportunity, with descriptive meeting minutes as an information tool. The presence of self-management impacts the Nucleus’ information policy and culture, and also its information flow, distinguishing itself from other social organizations by including decentralized practices and information autonomy on an individual and collective level. The nucleus creates social innovations mainly through projects and knowledge networks, where knowledge coordination and use of organizational memory are fundamental for its success. Challenges are faced, such as: knowledge loss, caused by the staff turnover and loss of gatekeepers; the management of a self-managed repository, in terms of structure and its consequent impact on information and knowledge retrieval; and time management on decision-making spaces, negatively affecting knowledge sharing and leading to knowledge under-use. We indicate minor incremental innovations such as expanding the use of ICT, increasing the number of communication channels; using a method like Kanban for email circulation; and possibilities for a structured competitive intelligence (or a new cooperative intelligence). Complementing the analysis, a metadata header prototype to be used in the Nucleus documents is presented, along with its immediate and long term benefits. Lastly, research suggestions are made to go beyond this case study, expanding on more general questions discussed in this research findings, such as the potential for interorganizational KIM and the epistemological matters involving information and knowledge in solidarity economy networks.
Avaliação das concentrações séricas de vitamina D em pacientes internados por COVID-19: prevalência de hipovitaminose e fatores associados
(Universidade Federal de São Carlos, 2023-04-23)
Neves, Fabio Fernandes
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https://lattes.cnpq.br/2652568399519714
;
https://orcid.org/0000-0001-6536-3249
Parametrização de ligantes em reações catalisadas por metais de transição
(Universidade Federal de São Carlos, 2023-04-24)
Barboza, Amanda Aline
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Ferreira, Marco Antonio Barbosa
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https://lattes.cnpq.br/6874055640224407
;
https://lattes.cnpq.br/4255739684342248
;
https://orcid.org/0000-0001-5606-911X
The approach of statistical methods capable of accurately predicting the relationship between catalyst structure and reactivity represents a major impact on reaction development, since both reactivity and selectivity of the catalyst employed in organic reactions are directly related to its structural aspects. In the case of transition metal catalysis, this parameterization provides quick information and relevant estimates about the structure and respective activity of new ligands that are briefly identified in structural descriptors that influence the desired activity. Here we list key results obtained in the development and use of ligand parameterization to guide, predict and explain the discovery and development of new catalysts and methodologies. In the context of nucleopalladation reactions, we highlight Wacker-type reactions that employ carbonylation reactions of double bonds not activated by CO capture in a palladium-catalyzed process. We present a new methodology to obtain pyrazoline ester derivatives tolerant to different substitutions at strategic positions in the starting material as demonstrated by the scope study. By statistical studies, it was possible to observe that the molecular softness (ƞ) of the pyridine has a direct relationship with the yield - except for the bulkiest pyridines. For monophosphine ligands, the reactivity threshold analysis revealed that bulkier ligands are associated with the worst results. When bisphosphines are involved, the angle between the phosphorus substituents in the complex with PdCl2 indicates an important role, which can be interpreted in terms of flexibility of the ligand. In summary, the parameterization analysis of phosphine ligands and pyridine bases in general revealed dominant influences of steric effects that may imply the formation of bis-ligated palladium species and a detrimental role of pyridine coordination in active catalysts. In sequence, we report our efforts to integrate data science and computational chemistry tools to guide, predict, and explain synthetic catalyst development in the context of ruthenium-catalyzed crossmetathesis in the synthesis of trisubstituted olefins. To investigate the reactivity of substrate versus catalysts, we performed reactions with 3 methylenecyclohexane derivatives (challenging substrates), cis-1,4-diacetoxy-2-butene and 28 Ru-based catalysts. These experimental results were integrated with molecular steric and electronic descriptors obtained for the Ru complexes to parameterize the catalyst structure in relation to the reaction yield. Our results indicate that although the overall structure of ruthenium-based olefin metathesis precatalysts is highly modular, the use of carbenes as one of the neutral ligands has the greatest impact on the performance of these reactions. The variation in the substitution pattern of the aromatic ring bonded to the NHC nitrogens comprises the greatest variability in results for the challenging substrates, still, no clear correlation could be observed. However, through catalyst parameterization we found correlations and univariate and multivariate models to predict the outcome of new structures to broaden the scope of the catalyst used in these important reactions.
Pesquisar COM como potência de aprendizagem social: uma experiência nas ciências ambientais junto a uma escola do campo
(Universidade Federal de São Carlos, 2023-04-24)
Oliveira, Maria Paula Pires de
;
Figueiredo, Rodolfo Antônio de
;
Valdanha Neto, Diógenes
;
https://lattes.cnpq.br/9925430852423901
;
https://lattes.cnpq.br/0854609216769461
O objetivo deste artigo é apresentar uma pesquisa-intervenção realizada no campo das ciências ambientais junto a uma escola do campo e analisar a possibilidade desse pesquisar COM como potência de aprendizagem social. A escola situa-se no Território Portal da Amazônia (norte de Mato Grosso) e a intervenção visou à definição, validação, aplicação e análise de indicadores estabelecidos para compreender o papel de práticas escolares na resiliência socioecológica de comunidades rurais, assim como uma análise conjunta dos resultados e do processo participativo. Foram realizados encontros dialogados e dinâmicas com a comunidade escolar para se alcançar os objetivos pretendidos. Para além dos resultados dos indicadores em si, uma análise do próprio processo evidenciou que este constituiu um exercício de aprendizagem social, o qual possibilitou o desenvolvimento de diferentes habilidades e valores.