84 research outputs found
Produção de biomassa e remoção de nutrientes em povoamentos de Eucalyptus camaldulensis Dehnh, Eucalyptus grandis hill ex Maiden e Eucalyptus torelliana F. Muell, plantados em Anhembí, SP.
The objetive of this work was to study the distribution of biomass and the quantity of storaged nutrients in the different compartments (leaves, branches, bark, timber) of Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden and Eucalyptus torelliana F. Muell tree, with 9, 9 and 12 years old respectively, cultivated in soils with low fertility and sandy texture, in Anhembi - SP. E. grandis showed the highest production of biomass for all the analysed compartiments excepting for thick branches. For the three species the trunk (bark + timber) represented in average 90 % of the biomass above the soil. The nutrients were concentrated in a decreasing way in leaves, branches, bark and timber. The crown of the trees were responsible for the accumulation of nearly 24 % of the nutrients in the total biomass of the trees. In the bark were found the highest quantities of calcium, nearly 60% of the total. E. grandis removed the highest quantity of nutrients of the soil, returning smaller quantities than the other species. Thus special cares should be taken in order to assure the yield of future.Neste trabalho estudou-se a distribuição de biomassa e a quantidade de nutrientes estocados nos diferentes compartimentos (folhas, ramos, casca e lenho) das árvores de Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell com 9, 9 e 12 anos de idade, respectivamente, plantados em solos de textura arenosa e baixa fertilidade, em Anhembi - SP. A espécie E. grandis foi a que apresentou a maior produção de biomassa para todos os compartimentos analisados, com exceção dos ramos grossos. Nas três espécies o tronco (casca + lenho) representou em média 90% da biomassa acima do solo. Os nutrientes concentraram-se de forma decrescente nas folhas, ramos, casca e lenho. As copas das árvores foram responsáveis pelo acúmulo de, aproximadamente, 24% dos nutrientes contidos na biomassa total das árvores. Na casca encontram-se as maiores quantidades de cálcio, aproximadamente 60% do total. A espécie E. grandis removeu do solo a maior quantidade de nutrientes, desenvolvendo através da queda de folhedo menores quantidades que as outras espécies. Desta forma cuidados especiais deverão ser dispensados para garantir a produtividade das rotações futuras
CARACTERIZAÇÃO MICROCLIMÁTICA NO INTERIOR DOS TALHÕES DE Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell, localizado em Anhambi, SP
Neste estudo avaliou-se algumas características microclimáticas em talhões de Eucalyptus camaldulensis, Eucalyptus grandis e Eucalyptus torelliana, resultantes dos diferentes tipos de cobertura florestal que estas espécies propiciam. Das três espécies estudadas, Eucalyptus camaldulensis foi a que deixou passar as maiores quantidades de radiação solar global e intensidade luminosa. Já Eucalyptus torelliana foi a espécie que mais interceptou a radiação solar e deixou o sub-bosque com menos luminosidade. As maiores temperaturas diárias e nos primeiros 10 cm do solo, foram observadas em Eucalyptus camaldulensis. Para as três espécies, aos 20 cm de profundidade a variação da temperatura foi praticamente constante. Através dos resultados encontrados foi possível confirmar que as árvores de Eucalyptus camaldulensis, Eucalyptus grandis e Eucalyptus torelliana, previamente estudadas na Austrália, pertencem, respectivamente, a formação de floresta aberta baixa, floresta aberta alta e floresta fechada
Caracterização microclimática no interior dos talhões de Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell, localizados em Anhambi, SP.
The objetive of this work was to evaluate some microclimatic features in areas with Eucalyptus camaldulensis, Eucalyptus grandis and Eucalyptus torelliana, resulting from different kinds of forestal cover that these species provide. From the three studied species, E. camaldulensis was the one that allowed the passage of the highest quantities of global solar radiation and light intensity. E. torelliana was the specie that more intercepted the solar radiation and let the understorey with less luminosity. The highest daily temperatures and in the first 10 cm of soil were observed for E. camaldulensis. For the three species, at 20 cm of depth, the temperature variation was pratically constant. From the results it was possible to confirm that trees of E. camaldulensis, E. grandis, and E. torelliana, studied previously in Australia, belong to the formation of short open forest, tall open forest and closed forest respectively.Neste estudo avaliou-se algumas características microclimáticas em talhões de E. camaldulensis, E. grandis e E. torelliana, resultantes dos diferentes tipos de cobertura florestal que estas espécies propiciam. Das três espécies estudadas, E. camaldulensis foi a que deixou passar as maiores quantidades de radiação solar global e intensidade luminosa. Já E. torellianafoi a espécie que mais interceptou a radiação solar e deixou o sub-bosque com menos luminosidade. As maiores temperaturas diárias e nos primeiros 10 cm do solo, foram observadas em E. camaldulensis. Para as três espécies, aos 20 cm de profundidade a variação da temperatura foi praticamente constante. Através dos resultados encontrados foi possível confirmar que as árvores de E. camaldulensis, E. grandis e E. torelliana, previamente estudadas na Austrália, pertencem, respectivamente, a formação de floresta aberta baixa, floresta aberta alta e floresta fechada
Mesolithic frequentation at Cividate Camuno-Via Palazzo (Brescia-Italy)
Researches carried out between 1987 and 1995 during the restoration of a Roman domus in Via Palazzo, in the old town centre of Cividate Camuno, in Valle Camonica (Brescia - Italy), discovered the presence of underlying prehistoric levels dating back to the Upper Palaeolithic, Mesolithic, Middle-Late Neolithic and Bell Beaker culture. The authors present the results of the typological study and use-wear analysis of the Sauveterrian lithic assemblage (SU 282)
pygwb: Python-based library for gravitational-wave background searches
The collection of gravitational waves (GWs) that are either too weak or too
numerous to be individually resolved is commonly referred to as the
gravitational-wave background (GWB). A confident detection and model-driven
characterization of such a signal will provide invaluable information about the
evolution of the Universe and the population of GW sources within it. We
present a new, user-friendly Python--based package for gravitational-wave data
analysis to search for an isotropic GWB in ground--based interferometer data.
We employ cross-correlation spectra of GW detector pairs to construct an
optimal estimator of the Gaussian and isotropic GWB, and Bayesian parameter
estimation to constrain GWB models. The modularity and clarity of the code
allow for both a shallow learning curve and flexibility in adjusting the
analysis to one's own needs. We describe the individual modules which make up
{\tt pygwb}, following the traditional steps of stochastic analyses carried out
within the LIGO, Virgo, and KAGRA Collaboration. We then describe the built-in
pipeline which combines the different modules and validate it with both mock
data and real GW data from the O3 Advanced LIGO and Virgo observing run. We
successfully recover all mock data injections and reproduce published results.Comment: 32 pages, 14 figure
Terrestrial Very-Long-Baseline Atom Interferometry:Workshop Summary
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more km-scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions
Soil water dynamics and litter production in eucalypt and native vegetation in southeastern Brazil
A directed search for gravitational waves from Scorpius X-1 with initial LIGO
19 pages, 8 figuresInternational audienceWe present results of a search for continuously-emitted gravitational radiation, directed at the brightest low-mass X-ray binary, Scorpius X-1. Our semi-coherent analysis covers 10 days of LIGO S5 data ranging from 50-550 Hz, and performs an incoherent sum of coherent -statistic power distributed amongst frequency-modulated orbital sidebands. All candidates not removed at the veto stage were found to be consistent with noise at a 1% false alarm rate. We present Bayesian 95% confidence upper limits on gravitational-wave strain amplitude using two different prior distributions: a standard one, with no a priori assumptions about the orientation of Scorpius X-1; and an angle-restricted one, using a prior derived from electromagnetic observations. Median strain upper limits of 1.3e-24 and 8e-25 are reported at 150 Hz for the standard and angle-restricted searches respectively. This proof of principle analysis was limited to a short observation time by unknown effects of accretion on the intrinsic spin frequency of the neutron star, but improves upon previous upper limits by factors of ~1.4 for the standard, and 2.3 for the angle-restricted search at the sensitive region of the detector
Observation of gravitational waves from the coalescence of a 2.5−4.5 M⊙ compact object and a neutron star
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