A 43-Gbps Lithium Niobate Modulator Driver Module

This paper describes the realization of a 43-Gbps Lithium Niobate modulator driver module. The NRZ driver module utilizes four stages of GaAs p-HEMT MMIC amplifiers integrated with an output level detector and feedback loop to provide thermal stability and external control of the output swing. The bias and loop control circuitry are contained in the housing on a PC board external to the sealed MIC section. The integrated module (50.8 x 73.4 x 9.5 mm 3) provides 6.0 Vp-p controllable single-ended output voltage while dissipating only 4 watt

Sleep apnea-hypopnea quantification by cardiovascular data analysis

Sleep disorders are a major risk factor for cardiovascular diseases. Sleep apnea is the most common sleep disturbance and its detection relies on a polysomnography, i.e., a combination of several medical examinations performed during a monitored sleep night. In order to detect occurrences of sleep apnea without the need of combined recordings, we focus our efforts on extracting a quantifier related to the events of sleep apnea from a cardiovascular time series, namely systolic blood pressure (SBP). Physiologic time series are generally highly nonstationary and entrap the application of conventional tools that require a stationary condition. In our study, data nonstationarities are uncovered by a segmentation procedure which splits the signal into stationary patches, providing local quantities such as mean and variance of the SBP signal in each stationary patch, as well as its duration L. We analysed the data of 26 apneic diagnosed individuals, divided into hypertensive and normotensive groups, and compared the results with those of a control group. From the segmentation procedure, we identified that the average duration 〈L〉, as well as the average variance 〈σ2〉, are correlated to the apnea-hypoapnea index (AHI), previously obtained by polysomnographic exams. Moreover, our results unveil an oscillatory pattern in apneic subjects, whose amplitude S∗ is also correlated with AHI. All these quantities allow to separate apneic individuals, with an accuracy of at least 79%. Therefore, they provide alternative criteria to detect sleep apnea based on a single time series, the systolic blood pressure

Seleção de isolados de fungos entomopatogênicos para o controle de Hedypathes betulinus e avaliação da persistência.

Hedypathes betulinus (KLUG, 1825) (Coleoptera: Cerambycidae) é a principal praga da cultura da ervamate. Para o seu controle, avaliou-se em laboratório e campo a utilização de fungos entomopatogênicos. Em laboratório, foi avaliada a infectividade de isolados dos fungos Beauveria bassiana (Bals.) Vuillemin, 1912; B. brongniartii (Sacc.) Petch, 1926; Metarhizium anisopliae (Metsch.) Sorokin, 1883, e Paecilomyces (=Isaria) sp. Bainier, 1907, em adultos de H. betulinus. Os insetos foram imersos nas suspensões fúngicas na concentração de 107 conídios/mL. Após a aplicação, eles foram mantidos em laboratório para registro da mortalidade. Verificou-se que B. bassiana (CG 716) foi o mais infectivo, com 100% de mortalidade. Foi estimada a CL50 do isolado CG 716 de B. bassiana com cinco concentrações, variando de l05 a l09 conídios/mL, mais a testemunha. A CL50 estimada foi de 2,0x106 conídios/mL, variando de 6x105 a 5x106 conídios/mL. Foi avaliada a persistência do isolado CG 716 de B. bassiana formulado à base de óleo emulsionável em campo, verificando-se alta mortalidade nas primeiras três semanas após a aplicação do fungo, variando de 95 a 78%, decaindo para 65 a 47%, um e dois meses após a aplicação, respectivamente

'BRS Magna': nova cultivar de uva para suco com ampla adaptação climática.

bitstream/item/71803/1/cot125.pd

O uso de unidades de referência como ferramenta para a construção de sistemas agrícolas biodiversos para a agricultura familiar.

Resumo: Os sistemas de produção biodiversos são formas inovadoras de agricultura e pecuária que buscam aliar benefícios econômicos e ambientais, apoiados no incremento da biodiversidade. O Programa ?Sistemas agrícolas familiares biodiversos?, desenvolvido pela Equipe de Agroecologia da Embrapa Meio Ambiente, se caracteriza pela gradual formação de redes sócio-técnicas, articuladas em torno de Unidades de Referência (URs). As URs são parcelas ou unidades produtivas onde se desenvolvem todas as atividades técnicas sobre sistemas biodiversos (experimentação, capacitação e irradiação do conhecimento). O objetivo principal das URs é o de se tornarem inspiração para os demais agricultores na forma de exemplos práticos que possam ser adaptados à situação dos agricultores beneficiários finais, servindo como base para a criação de pequenas redes interligando URs em nível de microrregiões. Por meio destas estratégias de gestão reforça-se a replicabilidade dos conhecimentos gerados e o impacto sobre um número maior de beneficiários, podendo servir de base para a formulação de políticas públicas para a diversificação produtiva da agricultura familiar. Abstract: Biodiverse production systems are innovative forms of agriculture and livestock willing to align economic and environmental benefits, supported in increasing biodiversity. The 'family biodiverse agricultural systems' program, developed by Embrapa Environment Team Agroecology, is characterized by the gradual formation of socio-technical networks, articulated around the Reference Units (RUs ). The RUs are plots or production units where they develop all technical activities on biodiverse systems (experimentation, training and knowledge irradiation). The main objective of RUs is to become inspiration for other farmers in the form of practical examples that can be adapted to the situation of the beneficiaries end farmers, serving as a basis for creating small networks interconnecting RUs. Through these management strategies reinforces the replicability of knowledge generated and the impact on a larger number of beneficiaries, could be a basis for the formulation of public policies for productive diversification of family farming

Height-diameter allometry of tropical forest trees

Tropical tree height-diameter (H:D) relationships may vary by forest type and region making large-scale estimates of above-ground biomass subject to bias if they ignore these differences in stem allometry. We have therefore developed a new global tropical forest database consisting of 39 955 concurrent H and D measurements encompassing 283 sites in 22 tropical countries. Utilising this database, our objectives were: 1. to determine if H:D relationships differ by geographic region and forest type (wet to dry forests, including zones of tension where forest and savanna overlap). 2. to ascertain if the H:D relationship is modulated by climate and/or forest structural characteristics (e.g. stand-level basal area, A). 3. to develop H:D allometric equations and evaluate biases to reduce error in future local-to-global estimates of tropical forest biomass. Annual precipitation coefficient of variation (PV), dry season length (SD), and mean annual air temperature (TA) emerged as key drivers of variation in H:D relationships at the pantropical and region scales. Vegetation structure also played a role with trees in forests of a high A being, on average, taller at any given D. After the effects of environment and forest structure are taken into account, two main regional groups can be identified. Forests in Asia, Africa and the Guyana Shield all have, on average, similar H:D relationships, but with trees in the forests of much of the Amazon Basin and tropical Australia typically being shorter at any given D than their counterparts elsewhere. The region-environment-structure model with the lowest Akaike\u27s information criterion and lowest deviation estimated stand-level H across all plots to within amedian −2.7 to 0.9% of the true value. Some of the plot-to-plot variability in H:D relationships not accounted for by this model could be attributed to variations in soil physical conditions. Other things being equal, trees tend to be more slender in the absence of soil physical constraints, especially at smaller D. Pantropical and continental-level models provided less robust estimates of H, especially when the roles of climate and stand structure in modulating H:D allometry were not simultaneously taken into account