An investigation into the effects of solvent content on the image quality and stability of ink jet digital prints under varied storage conditions

Increasing numbers of galleries, museums and archives are including ink jet printed materials into their collections, and therefore displays. There is evidence that the instability of these prints is such that images can suffer deterioration in print quality or in extreme cases, a loss of information over an extended period of time. This is shorter than the period typically required for perceptible deterioration to occur in many other paper-based artworks. The image stability of prints is affected by a number of factors some of which have already been studied. However the role played by the ink solvent in the loss of image quality has yet to be explored. This paper will outline research being undertaken to investigate the effects of solvent content which may increase/promote the loss in image quality of the hard copy prints when stored or displayed under a range of temperature and humidity conditions

Suplementação estratégica com mistura mineral na recria de novilhas sob condições de pastejo.

Comparar o ganho de peso de 60 novilhas (Canchim, mestiças leiteiras e europeu - zebu), mantidas em pastagens de brachiaria decumbens

Aggregation of inkjet ink components by Ca and Mg ions in relation to colorant pigment distribution in paper

Papers coated with salts containing divalent cations exhibit superior inkjet print quality, which has been suggested to be due to fast aggregation of the colorant pigments close to, or even on, the surface of the paper. In this work we show the pivotal role of the carboxylic acid containing dispersing polymer. We report a series of aggregation and sedimentation experiments with commercial inks, generic ink formulations and specific ingredients comprising these formulations, and find differences in their response to the presence of MgCl2 or CaCl2. In particular, flocs and sediments formed in the presence of MgCl2 are denser than those formed in the presence of CaCl2. These differences are not predicted by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. We suggest that ion specific interactions occurring between Mg2+ or Ca2+, and charged carboxylate groups residing on the dispersing polymers, provoke the observed behavior.</p

Causas da variação da produção de leite por dia de intervalo de partos em um rebanho da Raça Holandesa, na região de São Carlos, SP.

Foi avaliado os efeitos fixos de ano, estação e ordem de parto, grupo genético, sexo do bezerro, causa da secagem, duração de lactação e aleatórios de touro no intervalo de partos e na produção de leite por dia de IEP

Causas de variação da produção de leite por dia de intervalo de partos em um rebanho da raça Holandesa, na região de São Carlos, SP.

Foi avaliado os efeitos fixos de ano, estação e ordem de parto, grupo genético, sexo do bezerro, causa da secagem, duração de lactação e aleatórios de touro no intervalo de partos e na produção de leite por dia de IEP