Capim setária: características e aspectos produtivos.

O capim setaria (Setaria anceps Stapf ex Massey ou Setaria sphacelata (Schumach.) Moss var. sericea (Strapf Clayton), cujas cultivares mais utilizadas no formação de pastagens no Brasil são Kazungula e, em menor escala, Nandi e Norok, vem despertando um crescente interesse no meio pecuário, pelas suas boas características forrageiras, especialmente pela sua considerável capacidade de crescimento durante boa parte do período seco. Resultados experimentais e observações a nível de fazendas tem confirmado os bons níveis de produtividade e suporte da espécie verificados em outros paises, destacando-a ainda como uma gramínea resistente ao pisoteio e, aparentemente, as cigarrinhas das pastagens. Neste trabalho, são apresentados uma descrição sucinta das três cultivares acima citadas e resultados de pesquisas, especialmente os obtidos nas condições brasileiras, com relação as suas exigências de clima e de solo e quanto ao estabelecimento, valor nutritivo, respostas a fertilizantes, produtividade e manejo. As informações reunidas permitem concluir que, embora a setaria seja uma gramínea tropical e medianamente exigente em fertilidade, apresenta condições de adaptação e boa produtividade, em grande parte dos diferentes tipos de solo e de clima existentes no Brasil, destacando-se especialmente nas regiões de clima subtropical e tropical ameno, onde a época de frio não muito prolongada, e a ocorrência de geadas severas não e freqüente.bitstream/item/104675/1/Capim-setaria.pd

Pastagens de setária: formação e manejo.

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Predicting river mouth location from delta front dip and clinoform dip in modern and ancient wave‐dominated deltas

Open Access via Wiley publishing agreement. This work was undertaken as part of the SAFARI project in a collaboration between the University of Aberdeen, United Kingdom and NORCE in Bergen, Norway. SAFARI is sponsored by a consortium of oil companies, the Norwegian Petroleum Directorate, and the Norwegian Research Council. Details at www.safaridb.com. PGS generously provided the seismic data for this case study. Software used for seismic interpretation and satellite imagery analysis was Petrel 2016 by Schlumberger and Google Earth Pro 7.3.2.5491. We would like to thank the associate editor C. Fielding as well as the reviewers G. Hampson and E. Anthony for critically reviewing the manuscript and offering constructive advice leading to significant improvement of both text and figures. DATA AVAILABILITY STATEMENT The data that support the findings of this study are available from the corresponding author upon reasonable request.Peer reviewedPublisher PD

Jahn-Teller effect versus Hund's rule coupling in C60N-

We propose variational states for the ground state and the low-energy collective rotator excitations in negatively charged C60N- ions (N=1...5). The approach includes the linear electron-phonon coupling and the Coulomb interaction on the same level. The electron-phonon coupling is treated within the effective mode approximation (EMA) which yields the linear t_{1u} x H_g Jahn-Teller problem whereas the Coulomb interaction gives rise to Hund's rule coupling for N=2,3,4. The Hamiltonian has accidental SO(3) symmetry which allows an elegant formulation in terms of angular momenta. Trial states are constructed from coherent states and using projection operators onto angular momentum subspaces which results in good variational states for the complete parameter range. The evaluation of the corresponding energies is to a large extent analytical. We use the approach for a detailed analysis of the competition between Jahn-Teller effect and Hund's rule coupling, which determines the spin state for N=2,3,4. We calculate the low-spin/high-spin gap for N=2,3,4 as a function of the Hund's rule coupling constant J. We find that the experimentally measured gaps suggest a coupling constant in the range J=60-80meV. Using a finite value for J, we recalculate the ground state energies of the C60N- ions and find that the Jahn-Teller energy gain is partly counterbalanced by the Hund's rule coupling. In particular, the ground state energies for N=2,3,4 are almost equal

Experimental study of ultracold neutron production in pressurized superfluid helium

We have investigated experimentally the pressure dependence of the production of ultracold neutrons (UCN) in superfluid helium in the range from saturated vapor pressure to 20bar. A neutron velocity selector allowed the separation of underlying single-phonon and multiphonon pro- cesses by varying the incident cold neutron (CN) wavelength in the range from 3.5 to 10{\AA}. The predicted pressure dependence of UCN production derived from inelastic neutron scattering data was confirmed for the single-phonon excitation. For multiphonon based UCN production we found no significant dependence on pressure whereas calculations from inelastic neutron scattering data predict an increase of 43(6)% at 20bar relative to saturated vapor pressure. From our data we conclude that applying pressure to superfluid helium does not increase the overall UCN production rate at a typical CN guide.Comment: 18 pages, 8 figures Version accepted for publication in PR

Observability of an induced electric dipole moment of the neutron from nonlinear QED

It has been shown recently that a neutron placed in an external quasistatic electric field develops an induced electric dipole moment $\mathbf{p}_{\mathrm{IND}}$ due to quantum fluctuations in the QED vacuum. A feasible experiment which could detect such an effect is proposed and described here. It is shown that the peculiar angular dependence of $\mathbf{p}_{\mathrm{IND}}$ on the orientation of the neutron spin leads to a characteristic asymmetry in polarized neutron scattering by heavy nuclei. This asymmetry can be of the order of $10^{-3}$ for neutrons with epithermal energies. For thermalized neutrons from a hot moderator one still expects experimentally accessible values of the order of $10^{-4}$. The contribution of the induced effect to the neutron scattering length is expected to be only one order of magnitude smaller than that due to the neutron polarizability from its quark substructure. The experimental observation of this scattering asymmetry would be the first ever signal of nonlinearity in electrodynamics due to quantum fluctuations in the QED vacuum

Using a multi-level tailored design process to develop a customer satisfaction survey for university evaluation

A multi-level procedure is described in order to develop a total quality management survey tool in the field of engineering academia. As a first step a review of available evaluation tools for universities is conducted, resulting in over 150 items used for evaluation purposes. Secondly all dimensions of educational evaluation used in previous research are summarized, resulting in 15 dimensions. In a third step, items are assigned to the dimensions, overlapping items were combined or removed, and item content and dimensions were adjusted to the specific conditions of the target faculty. Fourthly, the resulting twelve dimensions were used in first, investigative interviews in the target population. Results indicate that eleven dimensions sufficiently mapped all aspects of evaluation. After revising the items to improve understanding in a fifth step cognitive pretests were conducted. The final revision resulted in 83 items assigned to eleven dimensions