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Search Results: 1 - 10 of 186627 matches for " Caio Marcelo de Marcelo de Miranda "
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EQUACIONAMENTO E MODELAGEM DA BOBINA BIFILAR DE TESLA
Caio Marcelo de Marcelo de Miranda,Sérgio Francisco Pichorim
Revista Uniandrade , 2012,
Abstract: A Biotelemetria apresenta-se como uma importante técnica que possui várias aplica es na área de Biomedicina e outras. A dimens o da unidade remota ou sensora constitui um grande desafio dentro desta área, sendo que na maioria dos casos,deseja-se uma unidade o menor possível. Desta maneira, sensores passivos s o interessantes, pois possibilitam uma menor dimens o do dispositivo e n o necessitam de uma fonte própria de energia, ou bateria, que pode causar danos ao indivíduo monitorado caso ocorra vazamento do seu conteúdo químico. Deste modo,o sensor indutivo autorressonante apresenta-se como uma boa solu o, uma vez que este pode ser construído com apenas um componente, neste caso um indutor.Por apresentar pequenas dimens es, este tipo de sensor possui uma baixa capacitancia parasita, o que torna a sua frequência de ressonancia bastante alta. Neste caso, a bobina bifilar idealizada por Nikola Tesla pode constituir-se de uma solu o, uma vez que a idéia de Tesla era de aumentar a capacitancia intrínseca de suas bobinas. Portanto, um entendimento físico e devido equacionamento da bobina bifilar se faz necessário, uma vez que, até onde se sabe, este tipo de abordagem n o existe na literatura.A partir de uma análise das tens es entre espiras adjacentes, foi desenvolvido neste trabalho um equacionamento da bobina bifilar de Tesla, possibilitando a determina o do aumento da capacitancia interna e, consequente, redu o na frequência de ressonancia desta bobina. Um modelo elétrico equivalente da bobina foi também elaborado através desta análise. Isto possibilita o projeto de bobinas bifilares e predi o dos parametros capacitancia e frequência de autorressonancia desta bobina. Testes foram realizados ao comparar a frequência de autorressonancia calculada e medida para diversos números de espiras,comprovando a validade do modelo e das equa es desenvolvidas.
A Teoria da Resposta ao Item: possíveis contribui??es aos estudos em marketing
Pereira, Danielle Ramos de Miranda;Pinto, Marcelo de Rezende;
Gest?o & Produ??o , 2011, DOI: 10.1590/S0104-530X2011000400010
Abstract: the widespread utilization of multidimensional scales by researchers in field of marketing have motivated the conduction of a study to discuss the application of the item response theory (irt) as well as presenting a method that has proved very effective in the estimation of behavioral constructs. therefore, this article presents a discussion about irt highlighting its advances regarding the classical theory of tests (ctt) and its traditional applications in the fields of psychometrics and educational evaluation. to verify its applicability in marketing studies, the irt modeling was applied in a study involving a scale that has been widely used by researchers - market orientation (mktor scale) - proposed by narver and slater (1990). the results of the application demonstrated that even though the irt model proposed can be satisfactorily applied in the market orientation context there are many challenges to be faced, such as the construction of a scale with practical interpretation, indicating the significance of having the level of maturity associated with a specific construct. the final consideration emphasizes that the great contribution of this article to marketing studies is the presentation of an alternative method to estimate the constructs in a more detailed way and to evaluate the quality of the items in the scale.
Mortalidade pós-fogo em espécies lenhosas de campo sujo submetido a três queimadas prescritas anuais
Medeiros, Marcelo Brilhante de;Miranda, Heloísa Sinátora;
Acta Botanica Brasilica , 2005, DOI: 10.1590/S0102-33062005000300009
Abstract: fire is one of the agents with most significant effect on the structure and composition of plant communities in savanna ecosystems. this study evaluated the effects of fire on the mortality rates of individual plants, individuals with aerial mortality and basal or underground sprouts (top kill), and the number of destroyed stems which include aerial mortality and dead individuals. the annual prescribed fires were performed in 1998, 1999 and 2000, in a campo sujo area at the reserva ecológica do ibge (brasília, df, brazil). in a 2,500 m2 area all plants of woody layer with diameter equal or greater than 2 cm at 30 cm from soil level were surveyed. the data were evaluated with chi-square test (p<0,05). the survey counted 39 species and 636 individuals. the mortality rates for annual fires were 22.5% (1998), 7.9% (1999) and 11.5% (2000), reducing by 37% the number of live individuals in the area. mortality impacted mainly the small individuals - height between 1 and 2 m high, and 2 and 3 cm diam. after the three burnings, the dead individuals and those with aerial mortality represented 73% of total individuals.
Tooth in nasal cavity of non-traumatic etiology: uncommon affection
Oliveira, Henrique Fernandes de,Vieira, Marcelo Braz,Buhaten, Wady Miguel Santos,Neves, Caio Athayde
International Archives of Otorhinolaryngology , 2009,
Abstract: Introduction: The presence of ectopic supernumerary tooth is not an uncommon fact, and the estimate is that 1% of the population is affected. However, a tooth in nasal cavity is a rare event, independently of the etiology. Objective: To report a case of a tooth in nasal cavity whose etiology is neither traumatic and nor iatrogenic. Case report: The young patient presented with a radiopaque image in nasal cavity during dental propedeutics. Upon otorhinolaryngological exams, a tooth was identified, in spite of no existence of any trauma. Surgical treatment was carried out without complications. Final Comments: The presence of tooth in nasal cavity, in spite of being uncommon, must be given special attention. The dangerous triangle of the face is a potential place of complications, therefore, the approach must be surgical even in asymptomatic patients.
Dente em cavidade nasal de etiologia n o traumática: apresenta o rara
Oliveira, Henrique Fernandes de,Vieira, Marcelo Braz,Buhaten, Wady Miguel Santos,Neves, Caio Athayde
Arquivos Internacionais de Otorrinolaringologia , 2009,
Abstract: Introdu o: A presen a de dente supranumerário ou ectópico n o é fato incomum, sendo estimado ocorrer em 1% da popula o geral. Contudo, um dente em cavidade nasal constitui-se em evento raro, independente da etiologia. Objetivo: Relatar um caso de dente em fossa nasal cuja etiologia n o foi traumática nem iatrogênica. Relato de Caso: Paciente jovem apresentou imagem radiopaca em fossa nasal quando em propedêutica odontológica. Durante investiga o otorrinolaringológica, verificou-se tratar-se se dente, a despeito da inexistência de qualquer trauma. Foi realizado tratamento cirúrgico sem intercorrências. Comentários Finais: A presen a de dente em fossa nasal, apesar de infrequente, deve receber aten o especial. O triangulo perigoso da face é local potencial de complica es, portanto, a abordagem deve ser cirúrgica, mesmo que o paciente esteja assintomático.
Seletividade de inseticidas a Doru luteipes (Scudder, 1876) (Dermaptera: Forficulidae) e Cotesia sp. (Hymenoptera: Braconidae) inimigos naturais de Ascia monuste orseis (Godart, 1818) (Lepdoptera: Pieridae)
Pican?o Marcelo Coutitnho,Moura Marcelo Fialho de,Miranda Moacyr Mascarenhas Motta,Gontijo Lessando Moreira
Ciência Rural , 2003,
Abstract: Este trabalho objetivou estudar a seletividade dos inseticidas carbaril, deltametrina, paratiom metílico, permetrina e triclorfom em favor do predador Doru luteipes (Scudder) (Dermaptera: Forficulidae) e do parasitóide Cotesia sp. (Hymenoptera: Braconidae), em rela o ao controle do curuquerê Ascia monuste orseis (Godart) (Lepidoptera: Pieridae). Foram determinadas as CL90 para A. monuste orseis e estas foram utilizadas como doses discriminatórias para se avaliar o grau de seletividade dos inseticidas. Deltametrina e permetrina foram altamente seletivos em favor de D. luteipes. Deltametrina foi medianamente seletiva em favor de Cotesia sp. e a permetrina n o apresentou seletividade em favor deste parasitóide. Triclorfom foi altamente seletivo em favor de ninfas de quarto estádio e adultos de D. luteipes e mediamente seletivo em favor de Cotesia sp. e de ninfas de primeiro estádio do predador. Carbaril foi medianamente seletivo em favor de Cotesia sp. mas n o apresentou seletividade em favor de D. luteipes. Paratiom metílico n o foi seletivo em favor de Cotesia sp. e D. luteipes. Adultos de D. luteipes foram menos sensíveis a deltametrina, permetrina e triclorfom do que adultos de Cotesia sp., sendo que o inverso ocorreu com o carbaril. Esses inimigos naturais apresentaram alta sensibilidade ao paratiom metílico. Ninfas de quarto estádio e adultos de D. luteipes foram mais sensíveis ao paratiom metílico e triclorfom que ninfas de primeiro estádio. Ninfas e adultos de D. luteipes apresentaram semelhante sensibilidade ao carbaril, deltametrina e permetrina.
Sugammadex in the Management of Sinus Tachycardia after Rocuronium Administration: A Case Report  [PDF]
Eduardo Fernandes Orioli Guimar?es, Muriel Mofreita Saldanha, Tiago Coelho Fortes, Marcelo Grisolia, Marcos Lopes de Miranda, Carlos Darcy Alves Bersot
Open Journal of Anesthesiology (OJAnes) , 2014, DOI: 10.4236/ojanes.2014.49029
Abstract: In rare cases, rocuronium has been associated with dose-related tachycardia, probably by a cardiac muscarinic M2 receptor blockade mechanism. We report the case of a 30-year-old female who underwent excision of a branchial cyst under general anesthesia. This patient presented an episode of sinus tachycardia (130 bpm) shortly after anesthesia induction with propofol, sufentanyl, and rocuronium. Tachycardia could not be explained by any cause other than the use of rocuronium, which was reverted with sugammadex. Two minutes after sugammadex administration, heart rate normalized, corroborating our hypothesis that rocuronium induced the sinus tachycardia observed in our patient. The patient recovered well from the anesthetic-surgical procedure and showed no further cardiovascular, ventilatory, or neurological changes, being transferred to the post-anesthesia care unit, and finally discharged to the ward.
Modelo agrometeorológico para estimativa da produtividade para a cultura da soja no Estado de S?o Paulo
Camargo, Marcelo Bento Paes de;Brunini, Orivaldo;Miranda, Manoel Albino Coelho de;
Bragantia , 1986, DOI: 10.1590/S0006-87051986000200007
Abstract: the study was performed using phenological observation of field experiments carried out during three years (1977/78, 1978/79 and 1979/80), for four soybean cultivars in three localities. the proposed model to estimate crop yield was based on the reduction of the potential productivity when soil water content decreases below a critical value or when the surplus was above the potential evapotranspiration for a given period, in a manner that: yest = (ypot) x (fthe) x (fdef) x (fsur), where: yest = estimated yield; ypot = potential yield for a defined locality, being a function of the cultivar and technology; fthe = thermal factor, to express the degree of crop development (accumulated degree days); fdef = effect of water deficit in the soil on crop yield; fsur = effect of water surplus on crop yield. a comparison between the observed and estimated yield was highly satisfactory with determination coefficient (r2) ranging from 0.76 to 0.87 for all cultivars.
Variabilidade espacial de atributos físicos de um latossolo vermelho distroférrico, submetido a diferentes manejos
Sim?es, Welson Lima;Silva, élio Lemos da;Lima, Daniela Miranda de;Oliveira, Marcelo Silva de;
Revista Brasileira de Ciência do Solo , 2006, DOI: 10.1590/S0100-06832006000600015
Abstract: the study of the spatial variability of soil attributes can help in the determination of a specific management strategy that enhances agricultural productivity. the present study aimed at the evaluation of a possible influence of the soil management on spatial variability of a dystroferric red latosol (oxisol) physical properties. the study was carried out in 2002, in three adjacent areas, in lavras, minas gerais state, brazil, with the following management systems: a1 - fallowing for three years; a2 - recently planted coffee plants and a3 - area with three-year-old coffee plants. one hundred and eighty-eight grid points were sampled at distances of 1, 5 and 10 m. disturbed soil samples were collected at each sampling point in the 0-20 cm layer to evaluate the clay, silt, and sand contents and particle density. data were analyzed by classical statistics (sisvar software) and geo-statistics (geor software). it was concluded that management and land position influenced the spatial variability of the studied attributes, and the widest range of semivariograms was found in the areas with greatest soil disturbance. on average, silt and particle density presented the largest and smallest variation coefficients, respectively.
Immunological implications of the use of tyrosine kinase inhibitors in chronic myeloid leukemia
Camila de Souza Rodrigues,Larine Miranda Mendon?a,Jhony Robison de Oliveira,Marcelo Henrique Napimoga
Journal of Hematological Malignancies , 2012, DOI: 10.5430/jhm.v2n3p45
Abstract: Background: The treatment of chronic myeloid leukemia (CML) employs drugs known as tyrosine kinase inhibitors (TKIs). Comparative analyses of the effects of different TKIs has shown that these substances can reduce the immunogenicity of leukemic cells, and prejudice anti-tumoral immunity. Once the TKIs differ in terms of their direct influence on cells of the immunological system, the objective of this work was therefore to analyze alterations in the immunological systems of CML patients using different TKI drugs. Methodology/Principal findings: A review of the literature revealed that imatinib is considered to be the new paradigm for treatment of CML; however, use of this drug can result in inhibition of activation of immune system cells and development of resistance. Second and third generation TKIs can be used in the treatment of patients resistant to imatinib, but can have immunosuppressor effects. Nilotinib is more effective than imatinib in recently-diagnosed patients, however at high doses can induce myelosuppression and diminish cytokine production. Dasatinib was found to induce a rapid full cytogenetic response, with heightened in vivo immune-stimulation, in contrast to an immunosuppression observed in vitro. The mutated T315I phenotype of CML only shows a response to treatment with inhibitors that do not compete with ATP, involving aurora kinases that control mitosis, progression of the cellular cycle, and apoptosis induction. MK0457, which is able to act in the presence of the mutation, presents important bone marrow toxicity, while in small doses danusertib has shown anti-proliferative and pro-apoptotic activity against a wide spectrum of BCR-ABL-positive cells. Conclusions/Significance: Selection of the most suitable tyrosine kinase inhibitor in patients showing positive to the BCR-ABL mutation requires previous analysis of the phenotype and the influence of the TKI on the immunological system.
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