CMMN evaluation: the modelers’ perceptions of the main notation elements

Software and Systems Modeling - Case Management Model and Notation (CMMN) has been introduced as a graphical modeling language targeting the modeling of human-centric processes. Despite its growing...     

Polymeric Materials with Magnetic Properties

The paper deals with the study of the magnetic properties of some mechanochemically synthesized polychelates. Some spectral analysis methods such as ESR spectroscopy, atomic absorption spectroscopy, and especially Mössbauer spectroscopy are used for this purpose. The presence of metallic atoms (especially Fe) is responsible for the magnetic properties of these mechanochemically synthesized macromolecular compounds.     

Chemomechanical Systems: Study of Contraction and Mechanical Work of Poly(Acrylonitrile) Gel Fibers

Poly(acrylonim1e) fibers were preoxidated under stress, in the presence of air, then saponified by boiling in alkaline solutions. The chemomechani-cal behavior of these fibers, expressed as contraction and mechanical work, under different loads and in different solvent-nonsolvent and/or base-acid systems were investigated. Total nitrogen content, carboxyl groups content, tensile strength, and cross-link density were determined. Both contraction and mechanical work were expressed as functions of applied load in every studied system. The results of chemomechanical measurements were connected to those of chemical and physical investigations. Significant differences in chemomechanical behavior were found to be the result of different stress conditions during the preoxidation stage.     

Mechanochemically initiated polymerisations. 12. Spectral and thermal characterisation of some products obtained by vibratory milling of benzene and pyridine

Vibratory milling is used to open the aromatic ring of compounds such as benzene and pyridine and this is followed by concatenation of the structural units. The products obtained form both the soluble fractions in methanol, i.e. dimethylformamide and the insoluble fraction, the latter being found in the prevalent amount. Analysis of the soluble fractions by infrared spectroscopy (i.r.) and pyrolysis-gas chromatography (p.-g.c.) conforms their linear structure of the polyenic type with some short crosslinkings and a great sensitivity to the action of atmospheric oxygen.     

Socioeconomic position, health behaviors, and C-reactive protein: A moderated-mediation analysis.

Objective: We sought to understand the link between low socioeconomic position (SEP) and cardiovascular disease (CVD) by examining the association between SEP, health-related coping behaviors, and C-reactive protein (CRP), an inflammatory marker and independent risk factor for CVD, in a U.S. sample of adults. Design: We used a multiple mediation model to evaluate how these behaviors work in concert to influence CRP levels and whether these relationships were moderated by gender and race/ethnicity. Main outcome measures: CRP levels were divided into two categories: elevated CRP (3.1–10.0 mg/L) and normal CRP (≤3.0 mg/L). Results: Both poverty and low educational attainment were associated with elevated CRP, and these associations were primarily explained through higher levels of smoking and lower levels of exercise. In the education model, poor diet also emerged as a significant mediator. These behaviors accounted for 87.9% of the total effect of education on CRP and 55.8% the total effect of poverty on CRP. We also found significant moderation of these mediated effects by gender and race/ethnicity. Conclusion: These findings demonstrate the influence of socioeconomically patterned environmental constraints on individual-level health behaviors. Specifically, reducing socioeconomic inequalities may have positive effects on CVD disparities through reducing cigarette smoking and increasing vigorous exercise. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On the mathematical modeling of mechanochemical degradation of acrylonitrile–α-methyl styrene–vinyl acetate terpolymer in conditions simulating the wet-spinning

This article aims to carry out mathematical modeling of the mechanochemical degradation process of acrylonitrile–α-methyl styrene–vinyl acetate ternary copolymer in conditions that simulate its wet-spinning from dimethyl formamide solution. The influence of some factors on the mechanochemical degradation process is studied. Based on a great number of experiments a regression equation is determined, which correlates the intrinsic viscosity of the copolymer solution with the mechanical process variables (the length and length/diameter ratio, solution concentration, and pressure).     

Micronized (and Microcrystalline) Celluloses. Obtainment and Fields of Application

The prospect of using micronized materials in various technical domains has stimulated, in recent years, their industrial production as well as the elaboration of adequate technologies. In this context, the obtainment of micronized (and microcrystalline) celluloses has become very important, due to the theoretical, and especially to the practical, applications of these materials.     

Mechanochemisch eingeleitete Copolymerisationsreaktionen. 2. Synthese von binären Copolymeren durch Schwingmahlung von Acrylnitril,Vinylacetat, Styrol und α-Methyl-Styrol

The present work describes mechanochemically initiated syntheses of binary copolymers based on vinylic- and acrylic-comonomers by using vibratory grinding at room temperature. The reaction process and the chemical structure of the copolymers are influenced by a number of factors such as copolymer ratio, duration of vibratory grinding, and chemical nature of the basic materials. The obtained copolymers were analyzed by chemical and spectroscopical methods. The copolymers show some special properties and their structure is different from those copolymers synthesized by other methods.     

Mechano-chemische Komplexbildung durch Schwingmahlung von Poly(ε-caprolactam) mit Eisenchlorid in an- oder Abwesenheit von Äthylendiamin

Mechano-chemical syntheses of polychelates by vibratory milling using poly(ε-caprolactam) as parent polymer was studied. As ligands were utilized either distruction fragments of poly(ε-caprolactam) or their polycondensation products with ethylenediamine. As complexing centers were used Fe³⁺ ions from FeCl₃·6H₂O. Some properties of the polychelates are described.