The standing quasi-modes of the ideal magnetohydrodynamics (MHD) in a zero-β cylindrical magnetic flux tube that undergoes a longitudinal density stratification and radial density structuring are considered. The radial structuring is assumed to be a linearly varying density profile. Using the relevant connection formulae of the resonant absorption, the dispersion relation for the fast MHD body ...

Abstract We study the excitation of fluting perturbations in a magnetic tube by an initially imposed kink mode. use ideal magnetohydrodynamic (MHD) equations cold-plasma approximation. also thin-tube approximation and scale dependent independent variables accordingly. Then we assume that dimensionless amplitude mode is small it as expansion parameter regular perturbation method. obtain expressi...

The application of phylogenetic techniques to the documentation of cultural history can present a distorted picture due to horizontal transmission and blending. Moreover, the units of cultural transmission must be communicable concepts, rather than conveniently measurable attributes, and relatedness between elements of culture often resides at the conceptual level, something not captured by phy...

wood resources, non-wood plants and recycled papers are the common raw materials of papermaking. shortage of raw materials, is a challenging problem in developing pulp and paper industry. in this study, cladophora green algae was used as a new source of cellulosic fiberfor pulping and papermaking.. cladophora algae was cooked with cold soda method and then was mixed with nssc pulp at 10,20 and ...

In this study, the use of modified calcite as a filler in fluting paper production was investigated and its effect on retention some mechanical properties papers investigated. Ground calcium carbonate (GCC/calcite) cationic starch were used for modification. Filler modification with alum CPAM resulted starch-calcite encapsulation. Produced (MC) at certain dosages. Simultaneously, made unmodifie...

In this study a developed model has been used to evaluate the paper drying process and examine the pocket dryer conditions of a multi-cylinder fluting paper machine. The model has been developed based on the mass and energy balance relationships in which the heat of sorption and its variations with paper temperature and humidity changes have been taken into account. The applied model can be use...