oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 169 )

2019 ( 751 )

2018 ( 836 )

2017 ( 806 )

Custom range...

Search Results: 1 - 10 of 488795 matches for " Biazotto V. M. "
All listed articles are free for downloading (OA Articles)
Page 1 /488795
Display every page Item
Speed Control of an Autonomous Mobile Robot: Comparison between a PID Control and a Control Using Fuzzy Logic
Silveira, P. E.;Souza Jr., R. de;Biazotto, V. M.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000200008
Abstract: an autonomous mobile robot battery driven, with two traction wheels and a steering wheel is being developed. this robot central control is regulated by an ipc, which controls every function of security, steering, positioning localization and driving. each traction wheel is operated by a dc motor with independent control system. this system is made up of a chopper, an encoder and a microcomputer. the ipc transmits the velocity values and acceleration ramp references to the pic microcontrollers. as each traction wheel control is independent, it's possible to obtain different speed values for each wheel. this process facilities the direction and drive changes. two different strategies for speed velocity control were implemented; one works with pid, and the other with fuzzy logic. there were no changes in circuits and feedback control, except for the pic microcontroller software. comparing the two different speed control strategies the results were equivalent. however, in relation to the development and implementation of these strategies, the difficulties were bigger to implement the pid control.
Speed Control of an Autonomous Mobile Robot: Comparison between a PID Control and a Control Using Fuzzy Logic
Silveira P. E.,Souza Jr. R. de,Biazotto V. M.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: An Autonomous Mobile Robot battery driven, with two traction wheels and a steering wheel is being developed. This Robot central control is regulated by an IPC, which controls every function of security, steering, positioning localization and driving. Each traction wheel is operated by a DC motor with independent control system. This system is made up of a chopper, an encoder and a microcomputer. The IPC transmits the velocity values and acceleration ramp references to the PIC microcontrollers. As each traction wheel control is independent, it's possible to obtain different speed values for each wheel. This process facilities the direction and drive changes. Two different strategies for speed velocity control were implemented; one works with PID, and the other with fuzzy logic. There were no changes in circuits and feedback control, except for the PIC microcontroller software. Comparing the two different speed control strategies the results were equivalent. However, in relation to the development and implementation of these strategies, the difficulties were bigger to implement the PID control.
Estoicismo e imperium: a virtus do homem político romano = Stoicism and imperium: the virtus of the roman political man.
Renata Lopes Biazotto Venturini
Acta Scientiarum : Education , 2011,
Abstract: Esse artigo tem como objetivo estudar as rela es entre o Estoicismo e o Principado, a partir da leitura da correspondência pliniana. Plínio, o Jovem era originário de uma família equestre que ascendeu ao senado. Após ter exercido uma oposi o política moderada sob o reinado do imperador Domiciano, ela se tornou um dos ideólogos e um dos participantes mais ativos do poder imperial durante o reino de Nerva e de Trajano. Como homem político exaltou a virtus encontrando respaldo no mos maiorum (tradi o), e na modera o estóica. Dirigente de um círculo cultural e político e amigo íntimo de Trajano, Plínio ilustrou a ótica do imperador, sobretudo a ideologia de um grupo senatorial de concilia o permanente entre a cúria e o príncipe, buscando legitimar a política do César e orientar os interesses senatorias. The objective of this article is to study the relationships between Stoicism and the Principate by reading letters by Pliny. Pliny the Younger came from an equestrian family that rose to the senate. After opposition under the reign of Emperor Domitian, it became one of the ideologues and most active participants in imperial power during the reign of Nerva and Trajan. As a political man, he extolled virtus, finding support in the mos maiorum (tradition), and stoic moderation. Leader of a cultural and political circle and close friend to Trajan, Pliny illustrated the Emperor's views, particularly the ideology of a senatorial group for permanent conciliation between the Curia and the prince, seeking to legitimize the politics of the Ceaser and guide senatorial interests.
Arachnoid granulation affected by subarachnoid hemorrhage
Chopard, R.P.;Brancalh?o, R.C.;Miranda-Neto, M.H.;Biazotto, W.;
Arquivos de Neuro-Psiquiatria , 1993, DOI: 10.1590/S0004-282X1993000400005
Abstract: the purpose of this study was to investigate using light microscopy the fibro-cellular components of arachnoid granulations affected by mild and severe subarachnoid hemorrage. the erythrocytes were in the channels delimitated by collagenous and elastic bundles and arachnoid cells, showing their tortuous and intercommunicating row from the pedicle to the fibrous capsule. the core portion of the pedicle and the center represented a principal route to the bulk outflow of cerebrospinal fluid and erythrocytes. in the severe hemorrhage, the fibrocellular components are desorganized, increasing the extracellular channels. we could see arachnoid granulations without erythrocytes, which cells showed big round nucleous suggesting their transformation into phagocytic cells.
Aplica es de gráficos táteis de histogramas e setogramas para alunos cegos e de baixa vis o: uma prática inclusiva
Bruno Zucherato,Rodolfo Ferreira Biazotto,Maria Isabel Castreghini de Freitas
Revista Ciência em Extens?o , 2010,
Abstract: Introdu o: As políticas inclusivas atuais apontam para a inclus o de alunos especiais na rede regular de ensino, o que exige por parte dessas institui es uma certa adequa o de seus conteúdos e materiais de aprendizado. Atentando a essa demanda o projeto de extens o “Cartografia Tátil e Mapavox: uma alternativa para constru o de mapas e jogos táteis” vem acompanhando as atividades ligadas ao ensino de geografia da escola EMIEE “Maria Aparecida Muniz Michelin – José Benedito Carneiro” Deficientes Auditivos e Deficientes Visuais – EE - Araras, SP. Desenvolvendo materiais que auxiliem no ensino com a produ o de maquetes, mapas, jogos e gráficos táteis. Objetivos: O objetivo deste trabalho é apresentar os resultados das práticas realizadas na área de estudo no que se referem aos gráficos táteis: histogramas e setogramas, apresentando as técnicas utilizadas na produ o do material, como uma alternativa de ensino para deficientes visuais, o trabalho teve como subsídio a inicia o científica desenvolvida na mesma temática denominada “O estudo sobre a utiliza o de gráficos e mapas temáticos táteis por alunos cegos e de baixa vis o”. Métodos: A metodologia utilizada para a constru o do material tátil consistiu na inser o dos alunos em um processo de pesquisa, incluindo-os na elabora o do material, coletando os dados que seriam representados nos gráficos, organizando esses dados e construindo o gráfico, esse processo acaba viabilizando uma integra o entre a forma o do conceito espontaneo em integra o com a forma o do conceito mediado. Todas as etapas de constru o dos gráficos transmitidas aos alunos foram anteriormente testadas em laboratório, buscando respeitar a apreens o dos alunos acerca da realidade, atentando para a agradabilidade das texturas, o contraste das cores bem como do tamanho e a forma do material utilizado e construído. Resultados: O material construído se apresentou satisfatório com rela o aos objetivos propostos, o conjunto construído mostrou que a alternativa utilizada para o ensino de deficientes visuais: cegos e de baixa vis o é válida, sendo que os alunos ao participarem da elabora o do conteúdo teórico do material, apreenderam o conhecimento transmitido. Atualmente se encontra em fase de elabora o a inser o de recursos sonoros no material didático construído, bem como a elabora o de um caderno guia para transmitir as idéias e técnicas elaboradas pela pesquisa para professores de educa o convencional e especial.
Trauma de duodeno: análise de fatores relacionados à morbimortalidade
Fraga, Gustavo Pereira;Biazotto, Guilherme;Villa?a, Marcelo Pinheiro;Andreollo, Nelson Adami;Mantovani, Mario;
Revista do Colégio Brasileiro de Cirurgi?es , 2008, DOI: 10.1590/S0100-69912008000200006
Abstract: background: duodenal injuries remain one of the most complex challenges for trauma surgeons. the aim of this study is to evaluate factors that predict morbidity and mortality for duodenal trauma patients. methods: a registry-based retrospective analysis of data identified 77 patients with duodenal injuries in a university hospital from january 1990 to december 2005. grade i injuries were excluded. results: the injury trauma mechanism was penetrating in 87% and blunt in 13%. there was no difference in mortality based on trauma mechanisms. delayed operation more than 6 hours after injury was observed in 7.8% of patients, and it was not related to patient outcomes. we performed primary simple repair for duodenal injury in 84.4% and complex repair in 15.6% of the patients. the latter had higher morbidity. mean ati was 34.5 and mean iss was 22.8. overall morbidity and mortality rate were, respectively, 61% and 27.3%. most of no survivors were with hypovolemic shock at admission, they had lower rts, higher ati and iss, and they had lower triss than survivors. hypovolemic shock, altered rts, associated injuries, and probability of survival less than 50% were independently factors related to death. conclusion: morbidity following duodenal trauma was more dependent on associated intra-abdominal injuries, abdominal contamination and complex repair. physiologic presentation, associated injuries (iss > 25), and triss were important factors for predicting morbidity and mortality for traumatic duodenal injuries.
The use of pyloric exclusion for treating duodenal trauma: case series
Fraga, Gustavo Pereira;Biazotto, Guilherme;Bortoto, José Benedito;Andreollo, Nelson Adami;Mantovani, Mario;
Sao Paulo Medical Journal , 2008, DOI: 10.1590/S1516-31802008000600009
Abstract: context and objectives: significant controversy exists regarding the best surgical treatment for complex duodenal injuries. the aims of this study were to report on a series of eight cases of duodenal repairs using pyloric exclusion and to describe reported complications or improvements in clinical outcomes among patients with complex duodenal trauma. design and setting: cross-sectional study followed by a case series in a university hospital. methods: data on eight patients with duodenal trauma who underwent pyloric exclusion over a 17.5 year period were collected and analyzed. results: the causes of the injuries included penetrating gunshot wounds (gsw) in five patients and motor vehicle accidents (blunt trauma) in three patients. the time elapsed until surgery was longer in the blunt trauma group, while in one patient, the gunshot injury was initially missed and thus the procedure was carried out 36 hours after the original injury. the injuries were grade iii (50%) or iv (50%) and the morbidity rate was 87.5%. four patients (50%) died during the postoperative period from complications, including hypovolemic shock (one patient), sepsis (peritonitis following the missed injury) and pancreatitis with an anastomotic fistula (two patients). conclusions: pyloric exclusion was associated with multiple complications and a high mortality rate. this surgical technique is indicated for rare cases of complex injury to the duodenum and the surgeon should be aware that treatment with a minimalistic approach, with only primary repair, may be ideal.
Cross Skin Reactivity to Tyrosine Kinase Inhibitors in a Patient with Chronic Myelogenous Leukemia  [PDF]
V. Broshtilova, M. Balabanova
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.47130
Abstract:

Tyrosine kinase inhibitors (TKI) targeting the bcr-abl protein, c-kit and the platelet-derived growth factor receptors, are significant part of the pathogenic therapy of chronic myelogenous leukemia. A broad spectrum of cutaneous side effects has been described with the clinical use of imatinib mesylate, ranging from various acute rashes to toxic epidermal necrolysis. Herein, a case of cross skin toxicity to TKI in a patient with chronic myelogenous leukemia is presented. In the course of imatinib mesylate therapy the patient developed a grade 4 diffuse lichenoid drug eruption. Six months after switching to nilotinib, hyperpigmented macules and patches spread over his trunk and extremities. To date, few cases of cross skin reactivity to imatinib and nilotinib have been described, none of which showing different clinical phenotypes. Further understanding of the underlying mechanisms and leading to the development of skin rashes from different class of TKI is important to highlight new drug targets and modify the current therapies to a level of maximal efficacy.

Macroscopic Quantum System, Highly Correlated Electron State, and High-Temperature Superconductivity in Iron Pnictides  [PDF]
M. V. Krasinkova
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.57063
Abstract:

The qualitative model of the high-temperature superconductivity suggested earlier for cuprates and based on the idea that the superconductivity is associated with delocalized π bonding between ions is not only confirmed by experimental data on iron pnictides but is also improved. It is shown that the FeAs layer state is similar to that of a macroscopic quantum system characterized by a sandwich-type charge distribution in which negatively charged planes are two-dimensional electron crystals of pairs and positively charged planes are formed by positively charged ions. Superconductivity in such a system is accomplished by a two-dimensional Wigner crystal of bosons condensed into one and the same state. The crystal occupies a middle position with respect to charged planes in the sandwich structure, which leads to mutual compensation of all its interactions with all charged planes. The model can prove useful for development of the theory of superconductivity taking into consideration the highly correlated state of all valence electrons that manifests itself in formation of electron crystals with strong Coulomb interactions between them.

Performance Analysis of OFDM Synchronization Using Customized Floating Point for Low Complexity  [PDF]
V. Janakiraman, M. Kannan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.710264
Abstract: Orthogonal frequency-division multiplexing (OFDM) is a multi carrier modulation scheme mainly used for digital communications. The performance of OFDM system heavily depends on the synchronization scheme used. In most cases, the accuracy level of synchronization will be worsened by the error caused in fixed point arithmetic involved. In this paper, we analyze the impact of the fixed point arithmetic on the performance of the coarse timing and frequency synchronization. Here with an analytical approach through numerical simulations bit length of IEEE 754 standard single precision format is optimized according to the required degree of accuracy for low complexity. Also, a complete precision level requirement for FFT computations with all possible modulation types is obtained. The proposed precision model is compared with IEEE standard single precision model and its efficiency in OFDM synchronization process is proved through MATLAB simulations. Finally, the complexity reduction of proposed precision model in both addition and subtraction is proved against single precision format using hardware synthesis. Here we proved that more than 50% complexity reduction is achieved as compared to standard precision models without compromising quality. The quality retention of proposed model is proved in both timing and frequency synchronization process.
Page 1 /488795
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.