We present the dynamic velocity profiles of a Newtonian fluid (glycerol) and a viscoelastic Maxwell fluid (CPyCl-NaSal in water) driven by an oscillating pressure gradient in a vertical cylindrical pipe. The frequency range explored has been chosen to include the first three resonance peaks of the dynamic permeability of the viscoelastic-fluid--pipe system. Three different optical measurement t...

A simple one-dimensional model of Maxwellian injection into a cylindrical Penning–Malmberg trap is presented. This model is used to predict the radial density profile of an electron column produced by a biased cathode with an r potential variation. The column density n(r) is assumed to depend upon the cathode potential voltage Vk(r) and the self-consistent space-charge potential f(r) as n(r)}ex...

BACKGROUND Increasing sample throughput is needed when large numbers of samples have to be processed. In chromatography, one strategy is to reduce column length for decreased analysis time. Therefore, the feasibility of analyzing samples simply on a guard column was explored using refractive index and ultraviolet detection. Results from the guard columns were compared to the analyses using the ...

The construction of daily electricity consumption profiles is a common practice for user characterization and segmentation tasks. As in any data analysis project, to obtain these load profiles, stage preparation necessary. This article explores what extent does the selection technique impacts profiling. techniques discussed are used following tasks: standardization, data, dimensionality reducti...

BLOSUM and PAM series of protein substitution matrices are popular tools for scoring protein pairwise and multiple alignments. For protein multiple alignments there exists another representation of an evolving column, based on a set of predefined frequency profile patterns. For conserved sites, these profile patterns represent stationary points in a 20-dimensional profile space. There are 20 su...

The row (resp. column) rank profile of a matrix describes the stair-case shape of its row (resp. column) echelon form. We here propose a new matrix invariant, the rank profile matrix, summarizing all information on the row and column rank profiles of all the leading sub-matrices. We show that this normal form exists and is unique over any ring, provided that the notion of McCoy’s rank is used, ...

In this work, simulations of the complete separation process in anhydrous bioethanol production were carried out in Aspen Plus. This process comprises distillation and rectification columns as well as an extractive column. Equilibrium stage model and Barros & Wolf efficiency correlations were used to perform the calculations. Efficiency profiles were obtained for all columns showing that effici...

Vertebral compression represents a significant percentage of the morbidity associated with upward ejection. Vertebral and intervertebral structure reacts to and is sometimes irreversibly altered by ejection acceleration. Design and material properties of the normal vertebral column are sufficiently constant that when structural characteristics are defined and acceleration profiles known, predic...