ANÁLISE SILVICULTURAL E ECONÔMICA DE PLANTIOS CLONAIS E SEMINAIS DE Tectona grandis L.f. EM SISTEMA TAUNGYA1

RESUMO O objetivo deste estudo foi realizar uma análise silvicultural e econômica de plantios clonais e seminais de Tectona grandis em monocultivo e em sistema taungya com Zea mays, no Município de Figueirópolis D'Oeste, MT. O experimento foi instalado em 2010 e compôs um fatorial 2x2 em blocos casualizados e quatro repetições. Avaliaram-se a altura total (H), o diâmetro a 5 cm (DAB) e a 1,3 m (DAP) de altura em relação ao nível do solo, a área basal, o volume, a sobrevivência e a estimativa e tendência de crescimento da teca na idade atual e futura, além da produção de silagem do milho. Foram realizadas análises das receitas e custos totais de implantação e manutenção do sistema. Plantas clonais em monocultivo e no sistema Taungya apresentaram maior crescimento em altura total, DAB e DAP em relação às seminais. No monocultivo e no sistema Taungya, a produção (m3 ha-1) de plantas clonais em relação às seminais foi 33 e 30% superior, respectivamente. Os custos com insumos e atividades de implantação da teca foram superiores e os de manutenção, inferiores no sistema Taungya em relação ao monocultivo, tanto para plantios clonais quanto seminais. No sistema Taungya com plantas clonais, o milho reduziu em 21% os custos totais de implantação e manutenção em relação ao monocultivo; nas plantas seminais, a redução foi de 27%. A teca no sistema Taungya cresce menos, porém apresenta tendência de recuperação após a retirada do milho, cuja presença amortiza custos de implantação e manutenção da teca em plantios clonais e seminais

Amostragem para inventário florestal em sistemas silvipastoris

O inventário florestal, segundo diversos processos de amostragem, fornece estimativas de produção para todo povoamento florestal. Neste trabalho, testaram-se diferentes processos de amostragem em um sistema silvipastoril com arranjo em faixas de Eucalyptus grandis, no Município de Umuarama, noroeste do Paraná. A distribuição das plantas de E. grandis foi explotada para mapa em escala da área, no qual aplicaram-se diferentes técnicas de amostragem: amostragem aleatória simples (com parcelas retangulares paralelas ALS-RPA, perpendiculares às faixas ALS-RPE, e parcelas circulares - ALS-AC) e amostragem sistemática (com 5%, 10% e 20% de intensidade, respectivamente, AS-5, AS-10 e AS-20). Para comparação dos processos de amostragem, foi considerado o erro de amostragem (E%), segundo o qual verificou-se a melhor metodologia. Os resultados observados, demonstraram que os maiores E% foram obtidos na amostragem aleatória simples: ALS-C (61,64%), ALS-RPA (47,30%) e ALS-RPE (31,19%). Para a amostragem sistemática, o E% observado foi baixo: AS-10 (6,05%), AS-20 (7,04%) e AS-5 (12,49%). Desta forma, a amostragem sistemática foi eficiente em inventário florestal de sistemas silvipastoris por seu baixo E%

Search for long-lived neutral particles in pp collisions at s√=13 TeV that decay into displaced hadronic jets in the ATLAS calorimeter

This paper describes a search for pairs of neutral, long-lived particles decaying in the ATLAS calorimeter. Long-lived particles occur in many extensions to the Standard Model and may elude searches for new promptly decaying particles. The analysis considers neutral, long-lived scalars with masses between 5 and 400 GeV, produced from decays of heavy bosons with masses between 125 and 1000 GeV, where the long-lived scalars decay into Standard Model fermions. The analysis uses either 10.8 fb−1 or 33.0 fb−1 of data (depending on the trigger) recorded in 2016 at the LHC with the ATLAS detector in proton–proton collisions at a centre-of-mass energy of 13 TeV. No significant excess is observed, and limits are reported on the production cross section times branching ratio as a function of the proper decay length of the long-lived particles

Improved reconstruction of highly boosted τ -lepton pairs in the τ τ → (μνμντ )(hadrons + ντ ) decay channels with the ATLAS detector

This paper presents a new τ -lepton reconstruction and identification procedure at the ATLAS detector at the Large Hadron Collider, which leads to significantly improved performance in the case of physics processes where a highly boosted pair of τ -leptons is produced and one τ -lepton decays into a muon and two neutrinos (τμ), and the other decays into hadrons and one neutrino (τhad). By removing the muon information from the signals used for reconstruction and identification of the τhad candidate in the boosted pair, the efficiency is raised to the level expected for an isolated τhad. The new procedure is validated by selecting a sample of highly boosted Z → τμτhad candidates from the data sample of 140 fb−1 of proton–proton collisions at 13 TeV recorded with the ATLAS detector. Good agreement is found between data and simulation predictions in both the Z → τμτhad signal region and in a background validation region. The results presented in this paper demonstrate the effectiveness of the τhad reconstruction with muon removal in enhancing the signal sensitivity of the boosted τμτhad channel at the ATLAS detector

Cross-section measurements for the production of a W-boson in association with high-transverse-momentum jets in pp collisions at √s = 13 TeV with the ATLAS detector

A set of measurements for the production of a W-boson in association with high-transverse-momentum jets is presented using 140 fb−1 of proton–proton collision data at a centre-of-mass energy of √s = 13 TeV collected by the ATLAS detector at the LHC. The measurements are performed in final states in which the W-boson decays into an electron or muon plus a neutrino and is produced in association with jets with pT > 30 GeV, where the leading jet has pT > 500 GeV. The angular separation between the lepton and the closest jet with pT > 100 GeV is measured and used to define a collinear phase space, wherein measurements of kinematic properties of the W-boson and the associated jet are performed. The collinear phase space is populated by dijet events radiating a W-boson and events with a W-boson produced in association with several jets and it serves as an excellent data sample to probe higher-order theoretical predictions. Measured differential distributions are compared with predictions from state-of-the-art next-to-leading order multi-leg merged Monte Carlo event generators and a fixedorder calculation of the W +1-jet process computed at nextto-next-to-leading order in the strong coupling constant

Reconstruction and identification of pairs of collimated τ-leptons decaying hadronically using sqrt{s}=13 TeV pp collision data with the ATLAS detector

This paper describes an algorithm for reconstructing and identifying a highly collimated hadronically decaying τ -lepton pair with low transverse momentum. When two τ -leptons are highly collimated, their visible decay products might overlap, degrading the reconstruction performance for each of the τ -leptons. A dedicated treatment attempting to tag the τ -lepton pair as a single object is required. The reconstruction algorithm is based on a large radius jet and its associated two leading subjets, and the identification uses a boosted decision tree to discriminate between signatures from τ +τ − systems and those arising from QCD jets. The efficiency of the identification algorithm is measured in Zγ events using proton–proton collision data at √s = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb−1. The resulting data-to-simulation scale factors are close to unity with uncertainties ranging from 26 to 37%