Globalization and Traceability of Agricultural Production: The Role of Mechanization

Rosana G. Moreira, Editor-in-Chief; Texas A&M UniversityThis is an Invited Paper from International Commission of Agricultural Engineering (CIGR, Commission Internationale du Genie Rural) E-Journal Volume 4 (2002): F. Pierce and R. Cavalieri. Globalization and Traceability of Agricultural Production: The Role of Mechanization. Club of Bologna. Vol. IV. September 2002

The correlation of VLF propagation variations with atmospheric planetary-scale waves

Variations in the received daytime phase of long distance, cesium-controlled, VLF transmission were compared to the height variations of the 10-mb isobaric surface during the first three months of 1965 and 1969. The VLF phase values are also compared to height variations of constant electron densities in the E-region and to variations of f-min which have been shown to be well correlated with planetary-scale variations in the stratosphere by Deland and Cavalieri (1973). The VLF phase variations show good correlation with these previous ionospheric measurements and with the 10-mb surfaces. The planetary scale waves in the stratosphere are shown to be travelling on the average eastward in 1965 and westward in 1969. These correlations are interpreted as due to the propagation of travelling planetary scale waves with westward tilted wave fronts. Upward energy transport due to the vertical structure of those waves is also discussed. These correlations provide further evidence for the coupling between the lower ionosphere at about 70 km altitude (the daytime VLF reflection height and the stratosphere, and they demonstrate the importance of planetary wave phenomena to VLF propagation

Fitotoxicidade de alternativas herbicidas para a cultura do tomate para processamento industrial.

Objetivou-se com este trabalho avaliar a fitotoxicidade de alternativas herbicidas para a cultura do tomate industrial

Coherent pressure structures in turbulent channel flow

Most of the studies on pressure fluctuations in wall-bounded turbulent flows aim at obtaining statistics as power spectra and scaling laws, especially at the walls. In the present study we study energetic coherent pressure structures of turbulent channel flows, aiming at a characterization of dominant coherent structures throughout the channel. Coherent structures are detected using spectral proper orthogonal decomposition (SPOD) and modeled using resolvent analysis, similar to related works dealing with velocity fluctuations, but using pressure fluctuations as the output of interest. The resolvent operator was considered with and without the Cess eddy viscosity model. Direct numerical simulations (DNSs) of incompressible turbulent channel flows at friction Reynolds numbers of approximately 180 and 550 were employed as databases. Three representative dominant structures emerged from a preliminary spectral analysis: near-wall, large-scale and spanwise-coherent structures. For frequency-wavenumber combinations corresponding to these three representative structures, SPOD results show a strong dominance of the leading mode, highlighting low-rank behavior of pressure fluctuations. The leading resolvent mode closely agrees with the first SPOD mode, providing support to studies that showed better performance of resolvent-based estimators when predicting pressure fluctuations compared to velocity fluctuations. The dominant mechanisms of the analyzed modes are seen to be the generation of quasi-streamwise vortices with pressure fluctuations appearing close to vortex centers. A study on the individual contributions of the nonlinear terms (treated as forcing in resolvent analysis) to the pressure output reveals that each forcing component plays a constructive role to the input-output formulation, which also helps understanding the weaker role of forcing color in driving pressure fluctuations.Comment: 24 pages, 23 figure

On the applicability of transfer function models for ssi embedment effects

Soil-structure interaction (SSI) effects are typically neglected for relatively lightweight buildings that are less than two-three storeys high with a limited footprint area and resting on shallow foundations (i.e., not featuring a basement). However, when the above conditions are not satisfied, and in particular when large basements are present, important kinematic SSI may develop, causing the foundation-level motion to deviate from the free-field one due to embedment effects. In the literature, transfer function models that estimate the filtering effect induced by rigid massless embedded foundations are available to “transform” foundation-level recordings into free-field ones, and vice-versa. This work describes therefore a numerical study aimed at assessing potential limits of the applicability of such transfer functions through the employment of a 3D nonlinear soil-block model representing a layered soil, recently developed and validated by the authors, and featuring on top a large heavy building with basement. A number of finite element site response analyses were carried out for different seismic input signals, soil profiles and embedment depths of the building’s basement. The numerically obtained transfer functions were compared with the curves derived using two analytical models. It was observed that the latter are able to reliably predict the embedment effects in “idealised” soil/input conditions under which they have been developed. However, in real conditions, namely when a non-homogeneous profile with nonlinear behaviour under a given seismic excitation is considered, especially in presence of a basement that is more than one storey high, they may fail in capturing some features, such as the frequency-dependent amplification of the motion at the basement level of a building with respect to the free-field one

Manejo químico de plantas daninhas tolerantes ao glyphosate em algodoeiro roundup ready flex

Objetivou-se com este trabalho avaliar o controle de plantas daninhas tolerantes ao glyphosate por meio de diferentes sistemas de manejo químico em algodoeiro Roundup Ready Flex (RF). O experimento está sendo conduzido na área experimental do Instituto Mato-grossense do Algodão localizada no município de Sorriso-MT. A semeadura do algodoeiro cv. IMA 5675BG2RF foi realizada no espaçamento entrelinhas de 0,90 m com população de 90.000 plantas ha -1 . Os tratamentos foram constituidos pela aplicação de glyphosate (1.080 g e.a. ha -1 ), pyrithiobac-sodium (50,4 g i..a. ha -1 ) e trifloxysulfuron-sodium (3,75 g i.a. ha -1 ) em pós-emergência, de forma isolada ou associada aos 15, 35 e 55 dias após a semeadura (DAS) da cultura. O delineamento experimental foi o de blocos completos casualizados, com três repetições. Aos 40 dias após a terceira aplicação em pósemergência, avaliaram-se variáveis relacionadas à fitotoxicidade (escala EWRC) dos tratamentos às plantas de algodoeiro e a porcentagem de controle das plantas (Euphorbia heterophylla, Richardia brasiliensis, Alternanthera tenella e Eleusine indica), por meio de notas visuais de 0 a 100%, em que zero representa ausência de injúrias e 100 a morte das plantas. Três aplicações de glyphosate realizadas aos 15, 35 e 55 DAS do algodoeiro RF apresentam controle satisfatório de todas as espécies infestantes, assim como a aplicação de glyphosate + trifloxysulfuron-sodium aos 15 DAS seguido de glyphosate aos 35 DAS e as associações glyphosate + pyrithiobac-sodium, glyphosate + trifloxysulfuron-sodium e pyrithiobac-sodium + trifloxysulfuron-sodium aplicadas aos 15 DAS seguidas de glyphosate aos 55 DAS. A associação tripla glyphosate + pyrithiobac-sodium + trifloxysulfuron-sodium aplicada aos 35 DAS proporciona excelente controle das plantas daninhas estudas após a aplicação de glyphosate isolado ou pyrithiobac-sodium + trifloxysulfuron-sodium aos 15 DAS

Programas de manejo de plantas daninhas na cultura do feijão-caupi em Sinop-MT

A cultura do feijão-caupi ainda não possui herbicidas registrados para controle de plantas daninhas, dificultando seu manejo legal em áreas extensivas no Estado de Mato Grosso. Com isso, objetivou-se com este trabalho avaliar diferentes programas de manejo de plantas daninhas na cultura do feijão-caupi. O delineamento experimental foi o de blocos ao acaso com quatro repetições, sendo 20 tratamentos, incluindo duas testemunhas (com e sem capina). Avaliou-se a fitotoxicidade dos tratamentos herbicidas à cultura aos 7, 14, 21 e 28 dias após a última aplicação (DAA), a porcentagem de controle de Digitaria horizontalis, Eleusine indica, Tridax procumbens e Digitaria insularis (0 a 100%) e em relação ao feijãocaupi, avaliou-se a massa seca por planta, o número de plantas m -1 e a altura de plantas aos 28 DAA e a produtividade na colheita. O programa 17 (glyphosate + imazethapyr (dessecação) / s-metolachlor (pré) / bentazon (pós) não proporcionou nenhum sintoma de intoxicação nas plantas desde a primeira avaliação, enquanto a associação cloransulammethyl + sethoxydim em pós-emergência (programas 7 e 16) causaram maior intoxicação nas plantas de feijão-caupi na avaliação aos 7 DAA. Os programas de controle com dessecação, aplicação de herbicida pré-emergente e herbicida pós-emergente apresentam produtividades iguais à testemunha capinada, à exceção da aplicação em pós-emergência de imazamox + bentazon. Os programas com glyphosate associado a herbicida residual (imazethapyr) na dessecação com a aplicação em pós-emergência das associações imazamox + bentazon + fluazifop-p-butyl e ethoxysulfuron + fluazifop-p-butyl também apresentam produtividade igual à testemunha capinada

Method for High-Resolution Frequency Measurements in the Extreme Ultraviolet Regime: Random-Sampling Ramsey Spectroscopy

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