Preparation and analysis of standards containing microfilaments/microplastic with fibre shape

Chemosphere ◽  
2021 ◽  
Vol 270 ◽  
pp. 129410
Author(s):  
Raffaella Mossotti ◽  
Giulia Dalla Fontana ◽  
Anastasia Anceschi ◽  
Enrico Gasparin ◽  
Tiziano Battistini
Keyword(s):  
Fibre Shape

scholarly journals Effect of Breed and Age on Histopathological Changes in Pig M. Semimembranosus

2012 ◽  
Vol 12 (3) ◽  
pp. 311-321 ◽  
Author(s):  
Dorota Wojtysiak ◽  
Katarzyna Połtowicz ◽  
Władysław Migdał
Keyword(s):  
Connective Tissue ◽  
Age Groups ◽  
Histopathological Change ◽  
Histopathological Changes ◽  
Age Changes ◽  
Large White ◽  
Fibre Size ◽  
Giant Fibres ◽  
Fibre Shape ◽  
Selection Of

Effect of Breed and Age on Histopathological Changes in Pig M. SemimembranosusThe aim of the study was to determine the type and extent of histopathological changes in m. semimembranosus of Polish Landrace (PL), Polish Large White (PLW), Duroc, Pietrain, and Puławska pigs at 60, 90, 120, 150, 180 and 210 days of age. Changes in fibre size (atrophy, hypertrophy - giant fibres), changes in fibre shape (angular fibres), degenerative lesions (necrosis with phagocytosis) and connective tissue hypertrophy were evaluated. The presence of giant fibres was the only histopathological change observed in all age groups of PL, PLW, Duroc and Pietrain pigs, with the percentage of pigs with this type of pathology and the frequency of giant, atrophic and angular fibres increasing significantly with age. In Puławska pigs, giant fibres were only found in the oldest pigs aged 210 days. In these animals, giant fibres as well as atrophic fibres (at 180 and 210 days of age) and angular fibres (at 120, 150, 180 and 210 days of age) occurred in the smallest number of animals and were least extensive. Meanwhile, Pietrain pigs were characterized by a greater number of animals, a significantly greater proportion of giant fibres in all analysed age groups, and a greater proportion of atrophic fibres at 180 and 210 days of age compared to the other pig breeds under analysis. For connective tissue hypertrophy and necrosis with phagocytosis, the changes were not extensive. It is concluded that both the advancing age of the animals and selection of the pigs for increased leanness significantly increases the incidence of histopathological changes in muscle tissue, which may directly translate into pork quality.

A comparison of fibre deformations from mill like and laboratory kraft cooking of softwood

2014 ◽  
Vol 29 (2) ◽  
pp. 211-217
Author(s):  
Lennart Salmén ◽  
Joanna Hornatowska
Keyword(s):  
Tensile Strength ◽  
Unsolved Problem ◽  
The Other ◽  
Fibre Strength ◽  
Mechanical Forces ◽  
Lower Strength ◽  
Fibre Properties ◽  
Kraft Cooking ◽  
Pulp Strength ◽  
Fibre Shape

Abstract The fact that industrial pulps have a lower strength than their corresponding laboratory pulps is an unsolved problem affecting in various ways the potential fibre utilisation in different mills. The loss of pulp strength has to a great extent been attributed to changes at the fibre level. In order to clarify in what way changes in fibre properties contribute to the strength losses, cooking experiments were conducted using a laboratory batch digester in which mechanical forces may be introduced. Fibre properties, i.e. fibre structure and fibre strength, of laboratory-made pulps were compared with those of an industrial pulp. It was concluded that two essentially different mechanisms may be identified; one related to the transverse fibre shape, the other to fibre damage. The latter is manifested as lower rewetted zero-span strength which reduces tear resistance and tensile strength of the pulp. The former is a collapse of the fibre, reducing the lumen area and resulting in a pulp with lower water-retaining capacity, given sheets of lower density and a pulp that has to be beaten to a higher degree to reach the desired bonding and the desired tensile strength.

Poly(vinyl alcohol) nanofibres by electrospinning: influence of molecular weight on fibre shape

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Zeng Jun ◽  
Haoqing Hou ◽  
Joachim H. Wendorff ◽  
Andreas Greiner
Keyword(s):  
Molecular Weight ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Water Solutions ◽  
Bead Formation ◽  
Fibre Shape ◽  
Different Molecular Weight

AbstractPoly(vinyl alcohol) (PVA) nanofibres were obtained by electrospinning of PVA/water solutions. Formation of beaded fibres combined with decreased fibre diameters was observed for low PVA concentrations. Electrospinning of blends of PVA of different molecular weight resulted in less bead formation and smaller fibre diameters as compared to corresponding homopolymers of similar viscosity.

Optimal design of nonwoven air filter media: Effect of fibre shape

2014 ◽  
Vol 15 (7) ◽  
pp. 1456-1461 ◽  
Author(s):  
Dipayan Das ◽  
Shovan Das ◽  
S. M. Ishtiaque
Keyword(s):  
Optimal Design ◽  
Media Effect ◽  
Filter Media ◽  
Air Filter ◽  
Fibre Shape

scholarly journals Effect of fibre shape on transverse thermal conductivity of unidirectional composites

Sadhana ◽  
2015 ◽  
Vol 40 (2) ◽  
pp. 503-513 ◽  
Author(s):  
B RAGHAVA RAO ◽  
V RAMACHANDRA RAJU ◽  
K MOHANA RAO
Keyword(s):  
Thermal Conductivity ◽  
Unidirectional Composites ◽  
Transverse Thermal Conductivity ◽  
Fibre Shape

Prediction of Tensile Properties of Injection Moulding Flax Fibre Reinforced Polypropylene from Morphology Analysis

2013 ◽  
Vol 554-557 ◽  
pp. 1573-1582 ◽  
Author(s):  
Eric Lafranche ◽  
Carla Isabel Martins ◽  
Vania M. Oliveira ◽  
Patricia Krawczak
Keyword(s):  
Tensile Strength ◽  
Fibre Diameter ◽  
Fibre Length ◽  
Young Modulus ◽  
Flax Fibre ◽  
Fibre Content ◽  
Fibre Property ◽  
Fibre Shape ◽  
Shape Ratio ◽  
Diameter Distributions

The Young modulus and tensile strength of flax fibre reinforced polypropylene were determined and compared with the micromechanical models usually used in the case of short glass fibre reinforced composites. The fibre length and fibre diameter distributions of the injected reinforced of 2, 4, 8 and 22vol% compound were determined and used to the models in order to evaluate the expected properties of the composites. The mechanical properties were interpreted on the base of real fibre content, fibre orientation, fibre length and diameter distributions and morphology of the composites. The Kelly-Tyson’s model of the tensile strength prediction has been modified to take in consideration the fibre property variability due to the large distribution of fibre shape ratio induced by the process. Finally matrix modulus has been adjusted to take into account the change of crystallinity with fibre content.

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