Influência da posição diametral das tábuas e da vaporização nos defeitos de secagem de Eucalyptus grandis

This study evaluated the Eucalyptus grandis drying defects acting on boards diametrical position and on log steaming. Half of the logs, with diameter from 20 to <25, 25 to <30 and 30 to <35cm, were steamed during 20 hours at 90°C of temperature. Subsequently, the logs (control and steamed) were sawn. The boards were dried in the dry-kiln pilot and the resulting defects from the drying process were measured. The results indicate that: (1) the boards coming from control logs presented different magnitude defects in function of the diametrical position. The split and spring to increase in direction to pith, the bow to increase in direction to bark and cupping were bigger in intermediary boards; (2) the boards coming from steamed logs presented a reduction from drying defects in function of logs diameter and its more homogeneous index in the pith-bark direction.

Parcelamento da adubação nitrogenada na cultura do milho irrigado em sistema plantio direto

The purpose of this study was to evaluate the best time for application of N for an irrigated corn crop in a no-tillage system in the State of Alagoas. Three corn hybrids were used (TORK, FORT and BRS-3003) with four application times (days after sowing - DAS) for fertilizing with nitrogen as top dressing, consisting of the following treatments: 1) 120 kg ha-1 at 15 DAS, 2) 60 kg ha-1 at 15 DAS and 60 kg ha-1 at 30 DAS, 3) 120 kg ha-1 at 30 DAS, 4) 60 kg ha-1 at 30 DAS and 60 kg ha -1 at 45 DAS and 5) control treatment without N fertilization. The experimental design was in randomized blocks with four replications in a subdivided plot scheme. The components of the production studied were: final population of plants ha-1, numbers of corn ears ha-1 length of corn ears and number of rows of grains of corn and mass of 1000 grains. The productivities of grains obtained did not present significant differences among the treatments that received fertilization with nitrogen, independent of the time of application and number of split applications. It is concluded that in the notillage system in Alagoas spliting the manuring with nitrogen (top dressing) is not necessary.

Fontes e parcelamento do nitrogênio em cobertura, na cultura do milho sob plantio direto

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Isotermas de sorção e cinética de secagem de sementes de pomelo

The drying of grapefruit seeds, by-products from grapefruit processing, was studied at 40, 50, 60 and 70°C and at three air velocities, 0.6, 1.0 and 1.4 m s-1. Sorption isotherms of grapefruit seeds were obtained at each temperature by the static method using saturated salt solutions. The Henderson model adequately described the sorption isotherms, over the entire temperature range. Drying rates indicated that the drying of grapefruit seeds took place under the falling rate period. Effective moisture diffusivity in grapefruit seeds ranged from 4.36 × 10-10 to 6.82 × 10-10 m2 s-1. The temperature dependence of the effective diffusivity followed an Arrhenius relationship, and the activation energies were 12.23, 11.29 and 11.79 kJ mol-1 for dried grapefruit seeds under air velocities of 0.6, 1.0 and 1.4 m s-1, respectively. Three thin-layer models were used to predict the drying curves, Page, Lewis, and Henderson-Pabis model. The Page model presented the best fit for all drying air temperatures and velocities studied.

Propriedades físico-químicas de abacate submetido à secagem convectiva e desidratação osmótica

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Qualidade de sementes de crambe submetidas a métodos de secagem e períodos de armazenamento

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estimativa do tempo de vaporização das toras e sua implicação no desdobro e na secagem da madeira de Eucalyptus grandis

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação energética da secagem combinada de milho na região de Pedrinhas Paulista, SP

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Perda de matéria seca em grãos de milho submetidos a sistemas de secagem natural e artificial

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Efeito do sistema de secagem de crambe (Crambe abyssinica Hochst) na qualidade dos grãos e do óleo para produção de biodiesel

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Análises técnica e energética da secagem combinada no processamento de casulo do bicho-da-seda de Bombyx Mori L

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Cinética de secagem de abóboras (Curcubita moschata) pré-tratadas osmoticamente em soluções contendo sacarose

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Secagem de tomates inteiros submetidos a descascamento químico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Aplicações de secagem para o aproveitamento de resíduos da banana, visando sua aplicação na indústria

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo da secagem de polpa de coco verde em leito de jorro e viabilidade de sua utilização na indústria

Pós-graduação em Engenharia e Ciência de Alimentos - IBILCE