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Structures of spinors fiber bundles with special relativity of Dirac operator using the Clifford algebra

Hassan Yousif Atyeib Ibrahim

Demonstratio Mathematica

2021

Vol. 54, nr 1

410--424

The purpose of this article is to demonstrate how to use the mathematics of spinor bundles and their category. We have used the methods of principle fiber bundles obey thorough solid harmonic treatment of pseudo-Riemannian manifolds and spinor structures with Clifford algebras, which couple with Dirac operator to study important applications in cohomology theory.

Bioprocessing of Bamboo Materials

Fu J., Zhang X., Yu C., Guebitz G. M., Cavaco-Paulo A.

Fibres & Textiles in Eastern Europe

2012

Vol. 20, no. 1 (90)

13-19

Bamboo culms were processed using microorganisms, and fibre bundles were obtained. Bacteria and fungi with xylanase activity were isolated from the bamboo retting system. Chemical composition analysis of the fibre bundles obtained showed that the components are mainly cellulose, hemicelluloses and lignin. An increase in cellulose and hemicelluloses content was detected along with a decrease in lignin content after bio-processing. Environmental Scanning Electronic Microcopy of the fibre bundles (retted) showed great fibre sensibility towards moisture, which could significantly influence mechanical properties. Our results suggested that the bio-processing presented herein contributes to the possible development of a new means of bamboo bio-processing that can be regarded as a primary process to separate fibre bundles from non-cellulosic tissue in the culm.

Łodygi bambusowe przetwarzano przy użyciu mikroorganizmów, uzyskując wiązki włókien. Bakterie i grzyby o aktywności ksylanazy zostały wyizolowane w systemie roszenia. Analiza chemiczna otrzymanych wiązek włókien wykazała, że głównymi składnikami włókien są: celuloza, hemicelulozy i ligniny. Po biologicznej obróbce stwierdzono wzrost zawartości celulozy i hemiceluloz, a spadek zawartości lignin. Opracowany sposób obróbki łodyg bambusowych wykazał, że jest skuteczny i może być rekomendowany do powszechnego stosowania.

The mechanism of end breakage in ring spinning: a statistical model to predict the end break in ring spinning

Ghosh A., Ishtiaque S., Rengasamy S., Patnaik A.

Autex Research Journal

2004

Vol. 4, no. 1

19--24

The mechanism of end breakage in ring spinning is a complex phenomenon, and is entirely different from the yarn failure mechanism during a tensile test. In this paper a possible mechanism of end breakage is reported. A statistical model is developed for predicting the likely end breakage rate in ring spinning. The important factors in governing end breaks are the mean yarn strength, yarn strength variation, mean value of the peak spinning tensions and the variation of yarn mass irregularity. Some practical aspects have also been discussed to tackle the problem of when the breakage rate suddenly increases.