Number Of Long Fibers Research Articles

Зависимость качества трепаного волокна от сорта льна-долгунца и номера льнотресты

Abstract. The article presents information on the quality of long fiber obtained from flax of various quality of 31 varieties of flax of domestic and foreign selection during processing at flax processing enterprises of flax-growing regions of the Russian Federation. The purpose of the research is to determine the strength of the influence on the quality of the long fiber obtained during the processing of flax at processing enterprises, factors of the flax-long flax variety and the number of flax. Methods. The material for the study was flax fiber, represented by 523 batches and the long fiber obtained from it. The control developments of the flax trust were carried out according to a special methodological program with an assessment of the quality of fiber products according to the current regulatory documentation. A rating assessment of varieties by the quality of long fiber and a dispersion analysis of experimental data was carried out according to the scheme of a two-factor uneven complex. Results. Using the rating assessment of varieties by the quality of long fiber, a group of varieties characterized by its highest quality was determined when determining the number of flax on the entire evaluation scale. These include the following varieties: Al’fa, Tverskoy, Zaryanka, Dashkovskiy, Mogilevskiy 2, Tomsk 16. It is noted that in the context of the numbers of the flax trust, the set of varieties with high quality of long fiber represented by the rating varies significantly. It was found that the number of long fibers obtained during the processing of flax is more dependent on the quality of the produced flax (dispersion ratio Ff = 92.0 > Fst = 8.6) than the grade factor (Ff = 6.9 > Fst = 3.3). It is shown that the solution to the problem of improving the quality of long fiber that meets the requirements of the textile industry is primarily associated with the production of high-quality flax. The flax must have a quality of at least number 1.50. Scientific novelty. The priority of the factor of the flax seed number over the factor of the flax variety is proved, and their reliable influence on the quality of the long fiber produced at flax processing enterprises.

Differential elastin degradation and micromechanical properties in ascending aortic aneurysm groups: statistical modelling

BackgroundElastin microstructure is an important factor in aortic aneurysms. However, it is unclear whether elastin microstructure varies in different ascending aneurysm aetiologies, and how this relates to microme-chanical behaviour. Objective to combine in vitro experimentation and statistical modelling to distinguish between ascending aortic aneurysm groups; bicuspid aortic valve with associated aneurysm (BAV) and idiopathic degenerative aneurysm (DA). The role of micromechanical and biochemical properties as risk factors was explored.MethodsAortic biopsies were taken from patients undergoing BAV or DA aneurysmal repair (n = 30). Oscillatory nanoindentation was applied to the medial layer [1]. The same tissues were chemically or enzymatically digested and measured for collagen, elastin and glycosaminoglycan (GAG) levels using hydroxyproline, fastin elastin kit and 1–9 dimethylmethylene blue respectively. Elastic fibre numbers and length were measured from Verhoeff-Van Gieson stained images. All measured data and patient clinical characteristics were analysed using least absolute shrinkage and selection operator (LASSO) regression.ResultsMicromechanical properties of BAV tissue was found to be significantly higher than DA tissue (p < 0.001). Similarly, this significant trend was also noted for GAG (p = 0.004) and collagen levels (p = 0.02). Although elastin levels were not significant, an increase in the number of long fibres was observed in BAV tissue (p = 0.02).ConclusionsLASSO regression showed that micromechanical and elastin properties were unique predictors for BAV, whereas age, gender, collagen and preoperative aortic diameter were unique for DA. Our statistical approach is the first to show that ascending aortic aneurysm groups can be distinguished using novel in vitro measurements.

Single fiber pull-out test of regenerated cellulose fibers in polypropylene: An energetic evaluation

This paper focuses on the energetic evaluation of the single fiber pull-out test (SFPT) using regenerated cellulose fibers (RCF) in a PP matrix with a varying MAPP content. Glass fibers were used for reference purposes. By means of the SFPT the interfacial shear strength (IFFS), the critical fiber length (lc), the consumed energy of a fiber pull-out and the consumed energy of a fiber rupture were determined. Results were related to the fiber length distribution in injection molded specimens. It was shown that theoretically more fiber ruptures appear in composites with RCF than with GF. But RCF composites offer a larger number of long fibers, slightly underneath the critical fiber length, consuming a high amount of energy by being pulled out at a composite failure. The consumed energy of a fiber pull-out per length was increased by using MAPP but simultaneously the critical fiber length was significantly reduced.

Dry Eye Disease after Refractive Surgery: Comparative Outcomes of Small Incision Lenticule Extraction versus LASIK

To compare small incision lenticule extraction (SMILE) versus LASIK for post-refractive dry eye disease. Prospective, comparative, nonrandomized clinical study. Thirty patients scheduled for bilateral myopic SMILE and 30 age-, sex-, and refraction-matched patients scheduled for bilateral myopic LASIK were enrolled and followed for 6 months after the surgery. Complete evaluation of dry eye disease was performed at 1 and 6 months postoperatively, which included vision-related quality of life (Ocular Surface Disease Index [OSDI]), clinical examinations (tear film breakup time [TBUT], Schirmer I test, corneal staining), and tear osmolarity measurements, together with an overall severity score. Function and morphology of the corneal innervation were evaluated by corneal esthesiometry and subbasal nerve imaging using in vivo confocal microscopy (IVCM). Overall analysis of dry eye disease and corneal innervation. High incidence of mild to moderate dry eye disease was observed in both groups 1 month postoperatively, which remained significantly higher in the LASIK group than in the SMILE group 6 months after surgery (overall severity score [0-4]: 1.2±1.1 vs. 0.2±0.4, respectively, P < 0.01), leading to more frequent use of tear substitutes over the long term. Corneal sensitivity was better in SMILE than in LASIK eyes 1 month postoperatively (3.5±1.79 vs. 2.45±2.48, respectively, P < 0.01) and then recovered to statistically similar values at 6 months. Corneal nerve density, number of long fibers, and branchings as assessed by IVCM were significantly higher in the SMILE group compared with the LASIK group 1 and 6 months after surgery. Corneal sensitivity was negatively correlated with dry eye-related corneal damage (R² = 0.48, P < 0.01), and the long fiber nerve density was independently correlated with the OSDI score (R² = 0.50, P < 0.01) and the Schirmer test (R² = 0.21, P < 0.01) 6 months postoperatively. The SMILE procedure has a less pronounced impact on the ocular surface and corneal innervation compared with LASIK, further reducing the incidence of dry eye disease and subsequent degradation in quality of life after refractive surgery.

Structural Analysis of Blended Sliver Composed of Long and Short Fibers

The fiber leading end density in the blended sliver composed of long and short fibers was measured and cross-sectional number of fibers was obtained by using sliver diagram. The sliver structure was analyzed along the sliver axis. Subsequently, the influence of various drafting conditions on the sliver structure was also examined. The results obtained are as follows: (1) Variations in the fiber leading end density of short and long fibers in the blended sliver showed a similar tendency along the sliver axis. In all regions along the he sliver sliver axis, variation in the fiber leading end density of the short fiber component is larger than that of the long fiber component. (2) In the blended sliver composed of long and short fibers, there are a large number of short fibers in the region where the sliver gets thicker. On the other hand, there are a large number of long fibers in the region where it gets thinner. This tendency gets more and more noticeable with an increase in draft ratio and roller gauge. (3) The correlation coefficient of the cross-sectional number of long and short fibers increases in accordance with draft ratio and roller gauge. The phase of short fibers advances a little more than that of long fibers.

長・短繊維からなる混紡スライバの構造解析

The fiber leading end density in the blended sliver composed of long and short fibers was measured and cross-sectional number of fibers was obtained by using sliver diagram. The sliver structure was analyzed along the sliver axis. Subsequently, the influence of various drafting conditions on the sliver structure was also examined. The results obtained are as follows: (1) Variations in the fiber leading end density of short and long fibers in the blended sliver showed a similar tendency along the sliver axis. In all regions along the he sliver sliver axis, variation in the fiber leading end density of the short fiber component is larger than that of the long fiber component. (2) In the blended sliver composed of long and short fibers, there are a large number of short fibers in the region where the sliver gets thicker. On the other hand, there are a large number of long fibers in the region where it gets thinner. This tendency gets more and more noticeable with an increase in draft ratio and roller gauge. (3) The correlation coefficient of the cross-sectional number of long and short fibers increases in accordance with draft ratio and roller gauge. The phase of short fibers advances a little more than that of long fibers.