Navegando por Data de Publicação, começando com "2022-06-21"

Filtrar resultados por ano ou mês

Agora exibindo 1 - 3 de 3

Conselhos de Administração, Board Interlocking e Análise de Redes das empresas listadas no Nível 2 de Governança Corporativa da B3
(Universidade Federal de São Carlos, 2022-06-21) Oliveira, Jéssica Maria de; Saltorato, Patrícia; https://lattes.cnpq.br/4086015205835355; https://lattes.cnpq.br/5085622838545506
This dissertation aims at exploring the intrinsic characteristics of the Board of Directors, verifying the conformity of such boards with the stablished good practices of Corporate Governance while also exploring the Board Interlocking that exists in said boards with the help of Network Analysis. It also aims to map the shareholder composition of the studied companies composed by a sample of Level 2 of Corporate Governance of B3 from the year 2017. For that, we used a theory-based research in which he data collection in order to reach the objectives was achieved through a bibliographic and documental research. In order to analyze the networks of the Board Interlocking, we used the Gephi software to draw the networks of interest and make the measurements of Modularity, Intermediation Centrality, Degree Centrality and Proximity Centrality. The results regarding the characteristics of the Board of Directors shows board members with notable professional careers and academic legitimacy, little feminine participation and boards composed mostly by family members. The results regarding the conformity of the Board of Directors with the good practices of Corporate Governance show that the size of the boards to be in accord to the legislation, CEOs/Vice-CEOs holding also the positions of Chariman/Vice-Chairman and once more the issue of family members with control of the board composition. Last, the results for Board Interlocking, one research showed that 80,9% of the board members of the analyzed companies were interlocked, meaning that they participated in ate least two different boards, connecting the sample to other 789 organizations. Of the 20 companies, only 2 (AES Tietê and AES Eletropaulo) connected directly through the Board Interlocking. Another analysis assessed the inter-board Board Interlocking in which 14 of the 20 assessed companies had two or more board members acting together in another 46 companies not listed At the Level 2 of the Corporate Governance of the B3. A third analysis showed that a subset of 42 companies not listed at the Level 2 of Corporate Governance of B3 (from the total of 789) which connect 18 companies listed at Level 2 of Corporate Governance (of the 20), with the exception of Celesc e and Gol. A network analysis was made using Gelphi, identifying 5 clusters; AES Eletropaulo, AES Tietê, Marcopolo and Renova had a higher degree centrality and intermediation; ABDIB, IBGC, AMEC, AES Tietê and AES Eletropaulo had higher proximity indicator. We also gathered data for the shareholder position of the 20 companies, in which 7 of them share investors. This network was drawn in tandem with the third analysis to verify which factors could complement the corporate relations. The Board Interlocking proved to be, therefore, a primordial factor to the network analysis, specially by the fact that the Board of Directors has several members that provide a myriad of connections. For future works, taking the shareholders position, underlying questions could also be analyzed in order to make clarify the corporate ties and the complexity of the networks made by them.
Estudo da influência de contraíons nas propriedades eletroquímicas, eletromecânicas e térmicas de compósito polímero ionomérico metal (IPMC) de Náfion®/Pt
(Universidade Federal de São Carlos, 2022-06-21) Tozzi, Kaique Afonso; Gonçalves, Roger; https://lattes.cnpq.br/5949704693295518; Scuracchio, Carlos Henrique; https://lattes.cnpq.br/0896060959622431; https://lattes.cnpq.br/6549314720328426
In the field of soft actuators, ionomeric polymer metal composite like devices (IPMCs) are a trend, as they display great displacement when a low electric potential is applied. Its work mechanism is related to the migration of solvated counterions inside the polymeric membrane, so the type of counterion plays a key role in the IPMC performance, while keeping the membrane hydrated limits the usage of IPMC's in dry environments. Ionic liquids (ILs) are used in IPMC to solve the dependence of the environment, but with the burden of poor mechanical performance. Thus, the objective of this work was to study the electrochemical, electromechanical and thermal properties of Nafion®/Pt-IPMC with different counterions (H+, Li+, Na+ and [BMIM]+) and to tune the concentration of ionic liquid 1-butyl-3-methylimidazole chloride ([BMIM]Cl) with 0.1; 0.3 or 0.5 mol L-1, attaining electrochemical stability with better electromechanical performance independently of humidity level. [BMIM]Cl was successfully synthesized and characterized through Nuclear Magnetic Resonance, Infrared Spectroscopy with Fourier Transform and Cyclic Voltammetry (CV). IPMC electrochemical behavior was studied through Electrochemical Impedance Spectroscopy, CV and Chronoamperometry, while the electromechanical properties were measured through blocking force and displacement, and mass loss with Thermogravimetric Analysis. IPMC-[BMIM]Cl tests were performed in distinct humidities (30%, 60% and 90%). Concentration of 0.3 mol L-1 provided electrochemical stability with the best electromechanical performance regardless of relative humidity. This result will be important for enhance the devices performance and efficiency.
Ensino de botânica na educação básica: material de apoio ao educador utilizando PANC
(Universidade Federal de São Carlos, 2022-06-21) Zerpa, Elisama Martins; Souto, Letícia Silva; https://lattes.cnpq.br/9284280370140756
As many aspects of education, teaching botany may not be easy due to several factors and awakening the student's interest in learning about plants can be very difficult. In this work we aim to help the teacher with support material so that he can present some plants in a different way, through cooking, with practical experiences, and showing students the wide variety of unconventional food plants that exist. The material has information on conventional food plants (PAC) and unconventional food plants (PANC), with a focus on PANC, where it will be possible to learn where to find, how to identify, how to collect, what are the benefits in food, forms of cultivation and examples of consumption. Videos of very practical cooking recipes were produced, which the teacher can make together with the class or take ready-made so that the students have the opportunity to taste. This support material can be used when the teacher starts to teach Botany or after the students already have knowledge about basic concepts, in that case, the material would offer elements that reinforce the concepts and help to have greater contact with plants.