Investiga??o do uso de ressoadores com geometria matrioska em antenas planares

Com todo o crescimento na ?rea de telecomunica??es atrav?s de aplica??es que utilizam a comunica??o sem fio, a demanda por novos dispositivos cada vez menores e mais eficientes para esse sistema tem crescido. A antena ? um elemento essencial no sistema de comunica??o sem fio, e tem sido desej?vel que ela seja miniaturizada conservando o desempenho. Diante dessas condi??es, a antena de microfita tem obtido destaque por sua facilidade de adequa??o em diferentes tipos de superf?cies e facilidade de fabrica??o. Algumas t?cnicas t?m sido desenvolvidas para obter a miniaturiza??o das antenas de microfita, sendo uma dessas t?cnicas a Defected Ground Structure (DGS), que mediante a inser??o de fendas no plano de terra da antena ocasiona modifica??es nos seus par?metros de modo que se obt?m uma diminui??o da frequ?ncia de resson?ncia sem alterar o tamanho e o desempenho da antena. Essas fendas podem apresentar diferentes geometrias, havendo trabalhos que obtiveram bons resultados utilizando an?is circulares repartidos (SRR, Split Ring Ressonators) como base para essa abertura no plano de terra. Neste trabalho ? apresentada a antena de microfita retangular com estrutura DGS baseada nas geometrias matrioskas fechada e aberta, tendo como suporte para compara??o dos resultados a antena de microfita retangular com estrutura DGS baseada nos SRR, verificando a redu??o da frequ?ncia de resson?ncia para as antenas de microfita e observado os efeitos das resson?ncias das estruturas DGS nessa redu??o. Dessa forma, estruturas DGS baseadas nas geometrias matrioska e SRR foram utilizadas em antenas de microfita com frequ?ncias de resson?ncias em 2,5 GHz, 3 GHz e 3,5 GHz. O melhor resultado, considerando a redu??o da frequ?ncia de resson?ncia, coeficiente de reflex?o e ganho, foi obtido com a antena de microfita com a estrutura DGS contendo quatro elementos baseadas na geometria matrioska aberta ressoando em aproximadamente 2,5 GHz. Com essa miniaturiza??o, a ?rea do patch da antena de microfita foi reduzida em at? 45,6%, sendo observado que quanto menor a resson?ncia da estrutura DGS maior a redu??o da frequ?ncia da antena de microfita.CAPES/FAPESQ e IFPB

Reposit?rio de Dr?geas Microcontrolado

A proposta adotada foi a de um recipiente controlado atrav?s de um microcontrolador, o qual possibilita que o dispositivo execute as seguintes tarefas: emitir um alarme para informar ao usu?rio a hora exata de ingerir a medica??o; visualizar, atrav?s de um dispositivo de LCD acoplado ao prot?tipo, bem como a hora e a data da retirada da medica??o. Criamos o dispositivo que atuar? tanto avisando ao paciente que est? na hora de tomar seu medicamento, quanto apresentando ao paciente a data e a hora que o tomou pela ?ltima vez, evitando assim que o medicamento seja tomado repetidamente

Genome-wide association and HLA fine-mapping studies identify risk loci and genetic pathways underlying allergic rhinitis

Allergic rhinitis is the most common clinical presentation of allergy, affecting 400 million people worldwide, with increasing incidence in westernized countries1,2. To elucidate the genetic architecture and understand the underlying disease mechanisms, we carried out a meta-analysis of allergic rhinitis in 59,762 cases and 152,358 controls of European ancestry and identified a total of 41 risk loci for allergic rhinitis, including 20 loci not previously associated with allergic rhinitis, which were confirmed in a replication phase of 60,720 cases and 618,527 controls. Functional annotation implicated genes involved in various immune pathways, and fine mapping of the HLA region suggested amino acid variants important for antigen binding. We further performed genome-wide association study (GWAS) analyses of allergic sensitization against inhalant allergens and nonallergic rhinitis, which suggested shared genetic mechanisms across rhinitis-related traits. Future studies of the identified loci and genes might identify novel targets for treatment and prevention of allergic rhinitis

Unusual winter Saharan dust intrusions at Northwest Spain: Air quality, radiative and health impacts

[EN] Saharan air masses can transport high amounts of mineral dust particles and biological material to the Iberian Peninsula. During winter, this kind of events is not very frequent and usually does not reach the northwest of the Peninsula. However, between 21 and 22 February 2016 and between 22 and 23 February 2017, two exceptional events were registered in León (Spain), which severely affected air quality. An integrative approach including: i) typical synoptic conditions; ii) aerosol chemical composition; iii) particle size distributions; iv) pollen concentration; v) aerosol optical depth (AOD); vi) radiative forcing and vii) estimation of the impact of aerosols in the respiratory tract, was carried out. In the global characterization of these events, the exceedance of the PM10 daily limit value, an increase in the coarse mode and a rise in the iron concentration were observed. On the 2016 event, an AOD and extinction-related Ångström exponent clearly characteristic of desert aerosol (1.1 and 0.05, respectively) were registered. Furthermore, pollen grains not typical of flowering plants in this period were identified. The chemical analysis of the aerosol from the 2017 event allowed us to confirm the presence of the main elements associated with mineral sources (aluminum, calcium, and silica concentrations). An increase in the SO42−, NO3− and Cl− concentrations during the Saharan dust intrusion was also noted. However, in this event, there was no presence of atypical pollen types. The estimated dust radiative forcing traduced a cooling effect for surface and atmosphere during both events, corroborated by trends of radiative flux measurements. The estimated impact on the respiratory tract regions of the high levels of particulate matter during both Saharan dust intrusions showed high levels for the respirable fractionSIThis study was partially supported by the Spanish Ministry of Economy and Competitiveness (Grant TEC2014-57821-R), the University of León (Programa Propio 2015/00054/001 and 2018/00203/001) and the AERORAIN project (Ministry of Economy and Competitiveness, Grant CGL2014-52556-R, co-financed with European FEDER funds). F. Oduber acknowledges the grant BES-2015-074473 from the Spanish Ministry of Economy and Competitiveness. C. Blanco-Alegre acknowledges the grant FPU16-05764 from the Ministry of Education, Culture and Sports, Spain. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and/or READY website (http://www.ready.noaa.gov) used in this study. The authors would also like to express their gratitude to the Naval Research Laboratory for providing the NAAP aerosol map and NASA for the satellite image used in the graphical abstract. The data from the MAPAMA network are property of the Office for Quality and Environmental Evaluation (DGCEA, in its Spanish acronym), belonging to the Ministry of Ecologic Transition. The data were supplied as a result of an agreement between the Spanish Ministry of Agriculture, Food and the Environment and the Scientific Research Council for sponsoring studies related to air pollution by particulate matter and metals in Spain. We thank AERONET network and specially Victoria E. Cachorro Revilla and Carlos Toledano for establishing and maintaining the Valladolid AERONET site used in this investigation. We also thank to Philippe Dubuisson for allowing the use of GAME model, as well as the Laboratoire d'Optique Atmosphérique (University of Lille

Reactive nitrogen/oxygen species production by nitro/nitrosyl supramolecular ruthenium porphyrin complexes.

This manuscript reports on new nitro/nitrosyl Ru-based complexes, which were synthesized with the purpose of using them as precursors to obtain supramolecular ruthenium porphyrin species ({TPyP[Ru (NO2)(5,50-Mebipy)2]4}(PF6)4) and ({TPyP[Ru(NO)(5,50-Mebipy)2]4}(PF6)12). The photochemical and photophysical properties of these porphyrin species were investigated. Results show that the complex containing nitrite is able to produce NO by homolytic O?NO cleavage (FPPh NO = 0.05) while the {TPyP[Ru (NO)(5,50-Mebipy)2]4}(PF6)12 does it by direct labilization (FPPh NO = 0.53) of the Ru NO bond. Furthermore, a triplet quantum yield of 0.09 and 0.27 was observed for complexes containing nitrite and nitric oxide, respectively. The reactive oxygen species quantum yield for the complex {TPyP[Ru(NO) (5,50-Mebipy)2]4}(PF6)12 (0.78) is consistent with the sum of quantum yields NO release (0.53) and triplet state (0.27), which suggests that both processes participate in the formation of the reactive species. Our results show that combining these characteristics, NO production and triplet states, on the same platform could induce a synergic effect, leading to a considerable improvement in the photodynamic action of these complexes