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Comparação dos efeitos dos protocolos de progressão da sobrecarga do treinamento de força nos ganhos de força e hipertrofia muscular: um estudo uni-cego, randomizado, controlado intra-sujeito
(Universidade Federal de São Carlos, 2023-04-11)
Chaves, Talisson Santos
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Libardi, Cleiton Augusto
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https://lattes.cnpq.br/8953409094842074
;
https://orcid.org/0000-0002-9003-7610
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https://lattes.cnpq.br/8763654450242923
This was a single-blind, randomized, within-subject controlled study that aimed to compare the effects of overload progression protocols by intensity (progINT) and volume (progVOL) on muscle strength and muscle cross-sectional area (MCSA). Thirty-nine volunteers (20 men and 19 women) had their legs randomized to progINT and progVOL. Both training protocols were performed unilaterally on the knee extension machine, 2-3 times per week for 10 weeks. The progINT protocol consisted of using a previously determined maximal repetition zone (i.e., 9 to 12 repetitions), and load was adjusted only when the individual performed more or fewer repetitions than previously stipulated. For the progVOL, load was not altered, but repetitions were increased whenever the moment of concentric muscular failure was prolonged. The primary outcomes (muscle strength and MCSA) were evaluated before and after 23 training sessions. Muscle strength was evaluated through the one-repetition maximum test (1RM) on the knee extension machine, and lateral vastus MCSA was evaluated by ultrasound. To compare the volume load (i.e., sets x repetitions x weight [kg] [VL]) accumulated between the protocols, the sum of the VL of all training sessions was considered. To compare the VL progression between the protocols, the average VL of the first three and last three sessions of the experimental period was considered. Evaluators were blinded to the allocation of legs. A significance level of p < 0.05 was adopted. Both protocols promoted increases in 1RM values from pre (progINT: 52.90 ± 16.32 kg; progVOL: 51.67 ± 15.84 kg) to post (progINT: 69.05 ± 18.55 kg, progVOL: 66.82 ± 17.95 kg), with no difference between them (p > 0.05). Both protocols promoted increases in MCSA values from pre (progINT: 21.34 ± 4.71 cm²; progVOL: 21.08 ± 4.62 cm²) to post (progINT: 23.53 ± 5.41 cm², progVOL: 23.39 ± 5.19 cm²),8 with no difference between them (p > 0.05). There was no difference between protocols in accumulated VL (progINT: 53,703 ± 17,390 vs. progVOL: 52,528 ± 18,283 kg; p = 0.34) or in progression VL (progINT: 882 ± 491 kg vs. progVOL: 1,107 ± 586 kg; p = 0.084). We found no differences between overload progression protocols by intensity and volume in gains of strength and muscle hypertrophy in untrained individuals.
Análise molecular de seis populações de Thalassomya gutae (Diptera, Chironomidae) da costa nordeste brasileira
(Universidade Federal de São Carlos, 2023-04-11)
Tanino, Érika Sayuri
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Fusari, Lívia Maria
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https://lattes.cnpq.br/4951378712238107
Species of Chironomidae living in marine environments are recorded in coastal areas throughout the world. These species belong to several taxonomic groups, including representatives of the Telmatogetoninae subfamily. Telmatogetoninae is predominantly found in intertidal habitats, being associated with rocky shores. It is represented by two genera: Telmatogeton Schiner and Thalassomya Schiner. Telmatogeton is recorded in Brazil through the occurrence of three species: Telmatogeton atlanticus Oliveira, Telmatogeton eshu Oliveira and Telmatogeton nanus Oliveira, with only the adults known. Thalassomya, in turn, was recorded in the country with the description of adult male, pupa and larva of Thalassomya gutae Neubern, Silva & Trivinho-Strixino. The species T. gutae has a wide geographic distribution, being found in many locations on the northeastern coast. In this context, the present work aimed to verify whether the analyzed populations, recognized as T. gutae, belong to this species or are considered cryptic species. Thus, we analyzed six populations distributed in the northeast region, in the states of Rio Grande do Norte, Paraíba, Alagoas and Bahia. In this way, advances were promoted in the DNA barcode extraction and amplification protocol for this species and the molecular status of the populations was defined.
Contribuições das unidades de auditorias das universidades federais brasileiras para os indicadores de impacto social
(Universidade Federal de São Carlos, 2023-04-11)
Contarin, Jaqueline
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Amaral, Roniberto Morato do
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https://lattes.cnpq.br/6958372164719600
;
https://lattes.cnpq.br/5410513888562693
Brazilian Federal Universities (UFs) contribute to the country’s political, economic, cultural, and social development, through education, research, outreach, and innovation. In this context, measuring results, mitigating risks, and improving work processes in universities are key to the success of their institutional projects and to the impact on society’s sustainable development. The main goal of this work was to research the contribution of Brazilian UF audit units to the improvement of their social indicators, based on the 17 Sustainable Development Goals (SDGs), implemented by the United Nations, and incorporated by the Times Higher Education (THE) university ranking. The method used was document analysis, with a mixed quantitativequalitative approach. The sample analyzed included 286 audit reports from 2019 to 2020, retrieved from the institutional websites of 33 UFs. The results comprise a set of indicators that characterize the activities of UF audit units and identify the relationship between the audit units’ recommendations and their contribution to the development and improvement of the UFs’ social indicators. The theoretical discussion and obtained results are expected to contribute to the research on the role of universities and their social impact through the development of social indicators, while using the relationship between recommendations from audit units and the respective areas in the social indicators.
A gestão da informação e do conhecimento no âmbito da transformação digital por análise bibliométrica
(Universidade Federal de São Carlos, 2023-04-12)
Cavaretti, Nicholas
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Hoffmann, Wanda Aparecida Machado
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https://lattes.cnpq.br/7609135667093837
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https://orcid.org/0000-0001-7171-2142
;
https://lattes.cnpq.br/4940470317677603
With the evolution, intermediary and convergence of digital, biological and physical technologies, the scenario of the Fourth Industrial Revolution is directly associated with the conceptions of the next steps of Digital Transformation and the concept of Industry 4.0. In this way, it is noted that Information Science could have the opportunity to enhance better results or approaches in the digital scenario. In this sense, this research aims to evolve, understand and approach the relationships between the topics Information Management, Knowledge Management and Digital Transformation, through bibliometric analysis. Indeed, it is classified research of a basic nature and with a quantitative-qualitative and exploratory-descriptive approach. The choice of the Web of Science database made it possible to recover, by descriptors, 5,615 records for Information Management, 5,297 records for the term Digital Transformation and, for the term Knowledge Management, 9,924 records. For data processing, visualization and construction of maps and networks, the VOSViewer tool and also Excel were used. Data such as: the collaboration network between countries, the evolution of publications and the co-occurrence of keywords through maps were analyzed and presented. Thus, 24 concepts were obtained that can be considered the connections that support Information Management and Knowledge Management in the context of Digital Transformation. It was found that there is a convergence that approaches the themes through Computer Science, Business and Economics (Business Economics), Engineering and Information Science when directed and focused on the identified research areas and under analysis to the most productive countries, in the Within the scope of research focused on Knowledge Management and Information Management publications, it is possible to verify that the first three positions in both rankings remain, being China United States and England. On the other hand, it can be considered that Germany, as a precursor of Digital Transformation initiatives, remains the leader in the ranking of publications on the subject. It is suggested as future studies the use of other metrics for analysis and measurement of results, as well as the use of other indexing bases of scientific documents and software for bibliometric analysis.
Existência e multiplicidade de soluções para diferentes classes de equações de Choquard
(Universidade Federal de São Carlos, 2023-04-12)
Böer, Eduardo de Souza
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Miyagaki, Olímpio Hiroshi
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https://lattes.cnpq.br/2646698407526867
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https://orcid.org/0000-0002-5608-3760
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https://lattes.cnpq.br/2186882513087562
In the present work we deal with two classes of Choquard Elliptic Equations with unbounded and sign-changing potentials, considering Fractional and Kirchhoff operators and nonlinearities with exponential critical growth. Applying variational techniques and classical theorems, under suitable conditions, we prove existence and multiplicity of solutions.
Outsiders na Câmara dos Deputados nas eleições de 2014 e 2018
(Universidade Federal de São Carlos, 2023-04-12)
Firmino, Karine Rodrigues
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Kerbauy, Maria Teresa Miceli
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https://lattes.cnpq.br/4762029784021248
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https://orcid.org/0000-0002-0622-1512
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https://lattes.cnpq.br/7703513035525633
The 2018 elections marked Brazilian politics, as they promoted a series of ruptures in the patterns of government formation and opposition. In the media, those elections were "the time of outsiders". This phenomenon is still little studied in Political Science independently without being associated with phenomena such as populism and antipolitics (BARR, 2009). The few existing studies are focused on executive candidates and majority elections, there is little material on the occurrence of outsiders in parliaments. Therefore, this research is dedicated to investigating the entry of outsiders in the Chamber of Deputies in 2014 and 2018. We argue that outsiders are not simply newbies (newcomers) in the Federal Chamber and that neither can they be assumed to be political rebels. The results show that there was a significant growth of outsiders in the Chamber of Deputies in the 2018 elections compared to 2014, with the right-wing parties being the ones that elected more outsiders. In this research we discuss the theoretical challenges in defining who are outsiders in Brazilian politics; we resort to studies on career and profession in Brazil, to establish the filters of inclusion and exclusion of parliamentarians in the category of outsiders, to characterize and locate these actors in the Brazilian political system.
Tradutores(as) e intérpretes de Libras e a triagem hospitalar: compreendendo seu papel e atuação no atendimento do paciente surdo
(Universidade Federal de São Carlos, 2023-04-12)
Carvalho, Samara de Souza
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Cabello, Janaina
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https://lattes.cnpq.br/4349074907357325
;
https://orcid.org/0000-0001-7221-687X
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https://lattes.cnpq.br/3397063454836179
This paper aims to discuss the role of the interpreter translator de Libras (TILS) in view of the need to assist deaf people in screening processes in emergency care at health centers and later referral to medical care. We had as a general objective analyze the technical and ethical aspects that must be present in the performance of the TILS during this screening, based on the considerations of a deaf person user of the public health network and a Libras interpreter who has already worked in this context. Therefore, for this qualitative research, we interviewed two participants - being a deaf person/patient and a professional interpreter of Libras - seeking to identify how this initial moment of reception in the health has been carried out with deaf people. The responses collected through of semi-structured interviews were analyzed using content analysis and organization into nuclei of meaning, seeking to emphasize the importance of strategies adopted to overcome linguistic differences and to achieve a good service in health centers in order to combat language barriers identified by the deaf person. As results, we highlight the lack of effective communication between healthcare professionals healthcare and deaf patients and we present some strategies used by health professionals caring for deaf patients, based on the report of the deaf patient (since TILS does not always work in this context), as well as strategies identified by the professional interpreter as those adopted for action in this sphere. In this sense, it is clear from from our interviews, that the health context presents challenges that are quite specific for interpretation for Libras, which points to the need specific training for the performance of TILS in the health sphere, given its complexity.
Análise e modelagem de vibrações auto-excitadas no processo de torneamento de ligas de titânio por elementos finitosa
(Universidade Federal de São Carlos, 2023-04-13)
Degan, Bruno Zambrano
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Shiki, Sidney Bruce
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https://lattes.cnpq.br/0573973677787523
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https://lattes.cnpq.br/2561715399174989
A critical parameter in machining processes is the final surface quality of the machined part, directly related to self-excited vibrations that arise in these processes due to the interaction between the cutting tool and the surface, thus impairing the final roughness obtained and intensifying the wear of the machining tool. cut. Thus, it becomes interesting to model these vibrations to obtain ideal ranges of cutting parameters, especially machining depth and rotation, ensuring better productivity without jeopardizing the surface quality of the machined parts. In the present work it is proposed, through the finite element method, the modeling of the self-excited vibrations in the turning process of titanium alloys, aiming at the creation of stability lobe diagrams through frequency response functions and machining constants, in order to evaluate the degree of influence of superior vibration modes on the stability diagrams and to allow an integration between the finite element model and a model for calculating the stability of the processes.
Embalagens ativas e inteligentes: tendências e projeções
(Universidade Federal de São Carlos, 2023-04-13)
Cândido, Antônio Henrique Melo
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Freire, Fábio Bentes
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https://lattes.cnpq.br/8937961078558996
Packaging is a technique that involves wrapping or protecting products for distribution, storage, commercialization, and use. In addition to containing the product, packaging also identifies, describes, protects, displays, promotes, and maintains properties and quality. Food packaging can be specifically defined as the packaging that protects against physical, chemical, and biological sources of contamination or adulteration. Active and intelligent packaging are two forms of commercialization that have the primary role of extending the shelf life of food products, thus reducing losses from expired or spoiled food. Unlike conventional packaging, active packaging employs technology that intentionally releases or absorbs compounds from the food or the free space in the packaging, thereby extending the products' shelf life by interrupting degradative reactions such as lipid oxidation, microbial growth, and moisture gain and loss. Intelligent packaging, on the other hand, communicates with consumers and other intermediaries throughout the entire commercialization chain. It is estimated that these two types of packaging will drive this sector, as the number of the world's population exceeds eight billion, and smart strategies for the production, distribution, and commercialization of food products become essential for society's development in the 21st century. The objective of this undergraduate thesis was to describe the current status of active and intelligent packaging within the food sector, highlighting the types already in use, and relate their functioning mechanisms to chemical engineering. Through a comparative contextualization between conventional and intelligent packaging, we sought to identify economically viable application trends that project the future of this form of food commercialization.
Theoretical and experimental investigation on the visible-light controlled functional properties in charged domain wall ferroelectrics
(Universidade Federal de São Carlos, 2023-04-13)
Pimentel, Jonathan Ordoñez
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García, Jose Eduardo
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https://orcid.org/0000-0002-1232-1739
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Venet Zambrano, Michel
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https://lattes.cnpq.br/4256279833398263
Optical control of ferroelectric properties have been attracted a growing interest as an alternative to the conventional control by applied electric fields. However, the major drawback for achieving an effective reversible optical control of domain rearrangement in conventional ferroelectrics lies in their wide optical band gap. Recent researches have reported a new form to optically control of electric polarization and its related properties by using visible light. Specifically, a light-induced local movement of domain walls was achieved, whose effects shown that the photoresponse at both local and macroscopic scales is wavelength-independent. This new phenomenon of light-matter coupling has a non-negligible time response and no light power threshold was observed. Such characteristics are observed through the crystal lattice structure, photo-induced strain and dielectric permittivity. In addition, experimental evidences suggest that the light-activated phenomenon seems to be correlated with the existence of atypical ferroelectric interfaces, known as charged domain walls, whose principal signature is to host free and bound electric charge. Undoubtedly, this phenomenon offers new possibilities for technological applications that are as yet unexplored. This thesis focuses in overcome some questions that remains to be solved concerning to this light-activated phenomenon. That is: What is the physical insight about the photo-ferroelectric response? Is the extension towards polycrystalline materials feasible? Are there other physical properties different from those already controlled enable to be modified? To answer these question, the thesis divides into two parts: one theoretical and another one experimental. In the first part, a phenomenology model describing the visible light-induced photoresponse is developed, which assumes that visible light modifies charged domain wall compensation so that the built-in electric fields in the system changes, thereby triggering the domain wall motion. As a result, a rearrangement of the domain structure occurs, leading to a macroscopic polarization variation and, consequently, the related properties. Regarding to extension towards polycrystalline materials, it is successfully proved that photoresponse can be observed by the optical control of the photo-induced strain. Furthermore, it is proved the hypothesis that the existence of charged domain walls is a requirement for the photoresponse to manifest. Finally, the thesis reports for first time that the mechanical response of a ferrolectric ceramics can be modulated by visible light, highlighting the role of the charged domain walls. In a broader perspective, this work contributes to extending the fundamental knowledge based on light-ferroelectric coupling, opening new opportunities to speed up the development of a new generation of contact-less photoelectronic devices.
O desafio das igrejas se fazerem inclusivas em face da grande apostasia juvenil
(Universidade Federal de São Carlos, 2023-04-13)
Silva, Daniel Kayan Sirtori Felix Lopes da
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Souza, André Ricardo de
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https://lattes.cnpq.br/7016915324466152
The purpose of this study is to expose and analyze the facts that leave the new generations in conflict, bringing inclusion into the churches, so that they don't get along and end up abandoning their beliefs. To this end, quotes and opinions from various authors on the subject were used, as well as the author's point of view through his experience in the field. The main objective of the work was to analyze the reasons for apostasy among young people in the church, examining why they have become more inclusive and their new nuances. The secondary objectives included conceptualizing and delimiting the new generations of believers and non-believers, studying the friction between them and understanding the churches' methods of reaching them. The methodology used was a bibliographical review, using books, articles and websites.
People s awareness of circular economy: scale development and relationship with social influence, psychological barriers, and favourable evaluation of sustainable development
(Universidade Federal de São Carlos, 2023-04-13)
Gonella, Jéssica dos Santos Leite
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Godinho Filho, Moacir
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https://lattes.cnpq.br/6136685270563354
;
https://orcid.org/0000-0001-6150-1333
;
https://lattes.cnpq.br/4855895070018631
Circular Economy (CE) encompasses strategies that aim to decouple economic activity from finite resource consumption and eliminate waste from the system as a matter of principle. Supported by a transition to renewable energy sources, the circular model builds economic, natural, and social capital through three principles: eliminate waste and pollution from the start; keep products and materials in use in the supply chain; and regenerate natural systems. The transition to a CE must be initiated by a paradigm shift in the entire supply chain including people. Although this topic is being addressed in several research studies around the world, there are still some research gaps to be filled: (i) Lack of research that considers the analysis of the CE from the perspective of people (bottom-up level), without standardizing on the position these actors occupy in the value chain or the social context in which they are inserted; (ii) the level of depth that CE strategies are dealt with, since the literature points to studies that address specific strategies individually, without delving into the plurality that configures CE; (iii) a lack of a measurement scale to measure people's awareness of CE; (vi) lack of studies in the Brazilian context. Thus, this thesis aims to analyse the factors that interact with people's awareness of CE and their effects on people's favourable evaluation of sustainable development. First, we conducted a Systematic Literature Review (SLR) to map the literature on CE studies. Second, we built and validate a measurement scale to evaluate people’s awareness of CE. After that, we used the validated measurement scale to test two theoretical models. The first presented as its objective assess the effect of Social Influence and Psychological Barriers on People's Awareness of CE. To support our theoretical model and to ground the constructs, we sought inspiration from the Theory of Behavioral Choice (TBC). The second, aimed the analyse the relationship between people's awareness of CE and Favourable Evaluation of people concerning the importance of efforts for sustainable development. To support this theoretical model, we sought inspiration from the Social Learning Theory, which suggests that people learn from their environment and the behaviours of others around them. A survey was applied to 1046 Brazilian respondents through non-probability sampling, and multivariate data techniques (PLS-SEM) were applied. The results of the first model showed that Psychological Barriers (Sunk Costs dragons and Limited Cognition dragons) restrict people's awareness of CE. Besides, it was found that Social Influence (family, friends, and celebrities) positively influence people's awareness of CE. The findings indicate that Social Influence mitigates the negative effect of Psychological Barriers on People's Awareness of CE. The results of the second model showed that people Awareness of CE positively influences favourable evaluation about the importance of Sustainable Development, and the engagement of people and the participation of institutions on Sustainable Development efforts.
Tendências de pesquisa em Informação & Saúde no Brasil: análise do GT 11 do ENANCIB
(Universidade Federal de São Carlos, 2023-04-13)
Sampaio, Hibari Sebin
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Dal'Evedove, Paula Regina
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https://lattes.cnpq.br/1170937498266968
With the growth of scientific production in health, the librarian's contribu-tion has proven to be indispensable for the treatment and availability of information in this area, in the face of the circulation of untrue infor-mation about health. From this perspective, information science plays a fundamental role in the creation and availability of informational products and services in the context of health that offer professionals in the field and citizens mechanisms capable of acting assertively. Therefore, the question arises what are the research trends in information and health in Brazil? In order to contribute to the subject, the objective is to outline the profile of the publications presented in GT11 in the last five editions of ENANCIB, through the following research activities: present the insertion of health in Brazilian information science; map the scientific production of GT11 for the years 2017, 2018, 2019, 2021 and 2022; and discuss the profile of scientific research in the field of information related to infor-mation and health, based on GT11. This is an exploratory and descriptive research, with a qualitative and quantitative approach to the data. As a result, there were a total of 65 publications presented in the period, dis-tributed across five investigative axes, presented by 116 authors from 33 public and private sector institutions; with emphasis on issues linked to health information policies. It is concluded that the investigative axis is active and offers important paths for establishing actions that promote and support health information, as a guarantee of personal, collective and global development.
Contribuições formativas da educação tutorial no ensino de graduação: relato das experiências do Grupo PET BCI/UFSCar
(Universidade Federal de São Carlos, 2023-04-13)
Lourenço, Adriano Ruda Gabriel
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Dal'Evedove, Paula Regina
;
https://lattes.cnpq.br/1170937498266968
The Tutorial Education Program, implemented by the Federal Government, encourages the development of teaching, research and extension activities at the undergraduate level in Higher Education Institutions in the country. In view of the importance and scope of tutorial education, the aim is to identify the contribution of the Tutorial Education Program (PET), more specifically its impact on Librarianship and Information Science courses, by reporting the experiences of the PET BCI Group at the Federal University of São Carlos (PET BCI/UFSCar). To this end, concepts and principles of tutorial education will be addressed, the role of tutorial education in the training of librarians and information scientists, as well as the experiences of PETs in library science in Brazil, with a focus on the historical path of PET BCI from UFSCar. It is an exploratory and descriptive research, conducted through bibliographical research and survey in environments maintained by the groups. As a result, there are benefits for the training of future librarians and information scientists in the personal, professional and general scope, with the PET BCI of UFSCar being a prominent group on the national scene.
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
;
https://lattes.cnpq.br/1170937498266968
;
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
;
https://lattes.cnpq.br/1246572405382250
;
https://orcid.org/0000-0001-6472-5957
;
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.