Desempenho produtivo de cultivares de girassol (Helianthus annuus L.) sob condições irrigadas no Rio Grande do Norte.

Este trabalho teve como objetivo avaliar o desempenho produtivo de cultivares de girassol em regime de irrigação. O ensaio foi conduzido na Estação Experimental da EMPARN, (Ipanguaçu,RN, 05º37? S 36º50? W , 70 m). O solo foi é um Neossolo de alta fertilidade, com adubação de 50-20-20 kg/ha + 2kg de Boro.. Utilizou-se irrigaçãoi por sulco e durante o ciclo da cultura foram aplicados 510 mm de água.. Foram avaliadas 26 cultivares, sendo 24 híbridos e 02 variedades em foi blocos ao acaso, com 04 repetições. As médias de rendimentos de grãos (aquênios) variaram de 2.110 kg/ha a 4.120 kg/ha, com média de 3.218 kg/ha. Sobressaíram-se os híbridos GRIZZLY, T 700, MG 52, NEON, HLS 03 e o HÉLIO 358, com respectivamente, 4.120 kg/ha, 4.097kg/ha, 3.705kg/ha, 3.638 kg/ha, 3.633 kg/ha e 3.610 kg/ha. Os maiores rendimentos de óleo foram obtidos com os genótipos MG 52, HÉLIO 358, HLS 03 e BRS-Gira 11, acima de 1.500kg/ha

Interação genótipos x ambientes em feijão-caupi via modelos mistos.

Na publicação: KAESEL JACKSON DAMASCENO-SILVA

Milho sertanejo: variedade selecionada para a região Nordeste.

bitstream/item/81820/1/CPATC-COM.-TEC.-32-91.pd

Phase diagram of a random-anisotropy mixed-spin Ising model

We investigate the phase diagram of a mixed spin-1/2--spin-1 Ising system in the presence of quenched disordered anisotropy. We carry out a mean-field and a standard self-consistent Bethe--Peierls calculation. Depending on the amount of disorder, there appear novel transition lines and multicritical points. Also, we report some connections with a percolation problem and an exact result in one dimension.Comment: 8 pages, 4 figures, accepted for publication in Physical Review

W-algebras from symplectomorphisms

It is shown how $W$-algebras emerge from very peculiar canonical transformations with respect to the canonical symplectic structure on a compact Riemann surface. The action of smooth diffeomorphisms of the cotangent bundle on suitable generating functions is written in the BRS framework while a $W$-symmetry is exhibited. Subsequently, the complex structure of the symmetry spaces is studied and the related BRS properties are discussed. The specific example of the so-called $W_3$-algebra is treated in relation to some other different approaches.Comment: LaTex, 25 pages, no figures, to appear in Journ. Math. Phy

Reconfiguration of assembly lines using lean thinking in an electronics components' manufacturer for the automotive industry

This article discusses the reconfiguration and improvement of electronics components assembly lines through the use of Lean Thinking principles. This reconfiguration was undertaken in a project that followed the action-research methodology. There were three main distinct problems related with the outdated assembly lines. The first came from a diagnosis of the assembly line itself, where quality problems and difficulties with compliance with the takt-time were identified, as well as activities that do not added value. The second happened due to an adjustment in demand that requires a reconfiguration of the line and, the third problem, related to the integration in an existing assembly line of a new process for a product pertaining to the same family, forcing the exploitation of synergies in production of these two products. Regarding the improvement proposals, some managed to be implemented in a timely manner, others, despite not having been implemented, their impacts has been predicted. Overall, the level of scrap was reduced by 57% through the implementation of the Lean Six Sigma methodology, and the cycle time of an operation was reduced by 12,5% by eliminating non-value adding operations. Also, gains were obtained by reducing the previous occupation with the project of an assembly line segment dedicated to the new product. With this, a reduction of one employee with the integration of two workstations was achieved.I would like to thank all the company's employees who made this project possible, and for the support given. This work has been supported by FCT - Fundacao para a Ciencia e Tecnologia within the R&D Units Project Scope: UIDB/00319/2020