Influência da fertirrigação no rendimento de grãos e componentes de produção do feijoeiro comum (Phaseolus vulgaris L.) cv. carioca.

O presente trabalho foi conduzido no periodo de marco a junho de 1990, em um latossolo vermelho-escuro alico, testura argilosa, fase cerrado, de relevo suave ondulado, no Centro Nacional de Pesquisa de Milho e Sorgo - CNPMS/EMBRAPA, em Sete Lagoas, MG, com o objetivo de se verificar a influencia de fertirrigacao, sobre os componentes de producao do feijoeiro comum (Phaseolus vulgaris L.) cv. carioca. O delineamento experimental utilizado foi de blocos ao acaso em parcelas subdivididas, com quatro repeticoes. Os tratamentos constaram da combinacao de quatro laminas de agua localizadas nas parcelas, e de quatro formas de parcelamento de nitrogenio em cobertura nas subparcelas de 12 x 12m com area util de 36m2. As laminas aplicadas em cada irrigacao por sistema de aspersao convencional foram de 18, 24, 30 e 36mm, resultantes do uso dos coeficientes 0,6, 0,8, 1,0 e 1,2 sobre 30mm de evaporacao acumulada no Tanque "Classe A" (ECA), que foi o criterio adotado como indicador do momento de irrigar. As laminas totais aplicadas em todo o ciclo, incluindo as precipitacoes, foram de L1 = 272, L2 = 320, L3 = 368 e L4 = 416mm. Fez-se a aplicacao de nitrogenio em cobertura via fertirrigacao, utilizando-se aplicador portatil e como fonte de nitrogenio, o fertilizante ureia, cujas doses e formas de parcelamento (kg de N/ha) foram: P1 - sem aplicacao de N, P2 - 90 na pre floracao, P3 - 45 na pre floracao e na floracao plena e P4 - 30 na pre floracao, 30 na floracao plena e 30 no enchimento de graos. Pela analise dos resultado (...

Small Solar Panels Can Drastically Reduce the Carbon Footprint of Radio Access Networks

The limited power requirements of new generations of base stations (BSs) make the use of renewable energy sources, solar in particular, extremely attractive for mobile network operators. Exploiting solar energy implies a reduction of the network operation cost as well as of the carbon footprint of radio access networks, but previous research works indicate that the area of the solar panels that are necessary to power a standard macro BS is large, so large to make the solar panel deployment problematic, especially within urban areas. In this paper we use a modeling approach based on Markov reward processes to investigate the possibility of combining small area solar panels with a connection to the power grid to run a macro BS. By so doing, it is possible to increase the amount of renewable energy used to run a radio access network, while also reducing the cost incurred by the network operator to power its base stations. We assume that energy is drawn from the power grid only when needed to keep the BS operational, or during the night, that corresponds to the period with lowest electricity price. This has advantages in terms of both cost and carbon footprint. We show that solar panels of the order of 1-2 kW peak, i.e., with a surface of about 5-10 m2, combined with limited capacity energy storage (of the order of 10-15 kWh, corresponding to about 3-5 car batteries), and a smart energy management policy, can lead to an effective exploitation of renewable energy

On the Use of Small Solar Panels and Small Batteries to Reduce the RAN Carbon Footprint

The limited power requirements of new generations of base stations make the use of renewable energy sources, solar in particular, extremely attractive for mobile network operators. Exploiting solar energy implies a reduction of the network operation cost as well as of the carbon footprint of radio access networks. However, previous research works indicate that the area of the solar panels that are necessary to power a standard macro base station (BS) is large, making the solar panel deployment problematic, especially within urban areas.In this paper we use a modeling approach based on Markov reward processes to investigate the possibility of combining a connection to the power grid with small area solar panels and small batteries to run a macro base station. By so doing, it is possible to exploit a significant fraction of renewable energy to run a radio access network, while also reducing the cost incurred by the network operator to power its base stations. We assume that energy is drawn from the power grid only when needed to keep the BS operational, or during the night, which corresponds to the period with lowest electricity price. The proposed energy management policies have advantages in terms of both cost and carbon footprint. Our results show that solar panels of the order of 1-2 kW peak, i.e., with a surface of about 5-10 m2, combined with limited capacity energy storage (of the order of 1-5 kWh, corresponding to about 1-2 car batteries) and a smart energy management policy, can lead to an effective exploitation of renewable energy

CODAP: um Consenso Multidisciplinar sobre a Definição, Diagnóstico e Tratamento da Dislipidemia Aterogénica em Portugal

Introduction and aims: Atherogenic dyslipidemia is an important contributor to residual cardiovascular (CV) risk, but it is underdiagnosed and undertreated. This study aimed to assess the opinion of Portuguese experts to generate a consensus concerning the diagnosis and treatment of atherogenic dyslipidemia, as well as to contribute toward standardization of clinical practice in this disorder. Methods: The study consisted in the application of a questionnaire to an expert panel, following a modified Delphi methodology. Results: The majority (88.4%) of the proposed items were found to be consensual. The expert panel recognized the importance of the atherogenic dyslipidemia phenotype, the role played by low-density lipoprotein cholesterol and non-high-density lipoprotein cholesterol as risk markers and therapeutic targets, the choice of statins as first-line lipid-lowering drugs, and the value of associating statins with fenofibrate as a means to reduce residual CV risk. However, the role played by triglycerides in CV risk and the therapeutic value of fibrates lacked consensus. Taking into consideration the state of the art and the opinions expressed in this study, the scientific committee developed a treatment algorithm aimed to improve the perception and treatment of atherogenic dyslipidemia. Conclusions: The experts involved in this study were shown to be familiar with the concept and the importance of atherogenic dyslipidemia. The few situations in which a consensus could not be found were mainly related to the interpretation and/or relevance of the available evidence.info:eu-repo/semantics/publishedVersio

Controle biológico aplicado e natural da lagarta-do-cartucho do milho.

bitstream/item/44201/1/controle-biologico-lagarta.pd

Plant sources of Amazon rosewood oil.

The aim of this study is to reevaluate the plant sources of the Amazon rosewood oil which have been named Aniba rosaeodora Ducke and Aniba duckei Kosterm. There is some disagreement on the exact botanical status of these species. Some Lauraceae specialists analyzing available material from both species concluded that there is no basis for regarding them as different. Based on our results we are confirming that the chemical composition of both species is quite different from that previously reported. So we are suggesting to bring back the previous botanical rosewood status as proposed by Adolph Ducke