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Pomiar naprężeń wewnętrznych w papierze. Cz. 6. Powstawanie i interpretacja naprężeń wewnętrznych w kierunku prostopadłym do powierzchni papieru

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Skowroński J. W.

Przegląd Papierniczy

2008

tom R. 64, nr 10

613-618

W tej części pracy przedstawiono wpływ grubości papieru na naturę naprężeń wewnętrznych w papierze oraz na procesy przetwarzania papieru. Typowe problemy powstałe w wyniku reakcji naprężeń wewnętrznych w papierze na kontakt z wodą podczas przetwarzania (drukowania, traktowania powierzchniowego oraz powlekania), to: falowanie papieru, pęcherzykowanie powierzchni, spadek gładkości i połysku papieru.

Part 6 of the study on internal stresses m paper extends this subject to the third dimension and discusses the importance of paper thickness on the nature of internal stresses in paper as well as its impact on paper-converting processes. Typical problems which may occur after converting range from waviness and cockles after printing to the drop of gloss and smoothness after paper surface contact with water during surface treatment and coating.

Comparative studies on the morphometry and physiology of European populations of the lagoon specialist Cerastoderma glaucum (Bivalvia)

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Tarnowska K. , Wolowicz M. , Chenuil A. , Feral J.-P.

Oceanologia

2009

tom 51

nr 3

437-458

Seasonal changes in the morphometric and physiological parameters of the cockle Cerastoderma glaucum (Bivalvia) from the Baltic Sea (GD), the North Sea (LV), and the Mediterranean Sea (BL) were investigated. The cockles from GD were much smaller than those from other populations due to osmotic stress. The female to male ratios did not differ significantly from 1 : 1. The northern populations (GD, LV) had a monocyclic reproductive pattern, whereas the southern population (BL) seemed to reproduce throughout the year. Seasonal changes in the contents of biochemical components appeared to be correlated with changes in trophic conditions and the reproductive cycle. Protein content was the highest in spring for all the populations. The highest lipid contents and lowest carbohydrate contents were noted in GD and BL in spring, while no marked differences were noted among seasons in LV (probably because the data from both sexes were pooled). Respiration rates in GD were the highest among the populations, which could have been due to osmotic stress. High metabolic rates expressed by high respiration rates in GD and LV in spring and autumn could have resulted from gamete development (in spring) and phytoplankton blooms (in spring and autumn).