Perfluoroalkylated diblock-alkyl methacrylate monomers for biomedical applications: Wettability of their copolymers with HEMA and DEGMA

The intermediate perfluoroalkylated diblock hydrophobic-hydrophilic secondary alcohols (9-11), which were prepared by the reaction of monomethyl ethers of oligomeric ethyleneglycols with 2-[(perfluoroalkyl)methyl]oxiranes (7 and 8), resulted in the formation of the title monomers (12-14) by the acylation with methacryloyl chloride. Copolymers of 12-14 with HEMA and DEGMA prepared under radical conditions display enhanced swelling properties.     

ОБ одном методе измер ения диаграммы Бейна, дополненной линиями Ms и Mf

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A method of mesuring in Bain's diagram completed by lines Ms and Mf

     

Die Abhängigkeit der Koerzitivkraft von der plastischen Deformation

In der vorliegenden, Abhandlung werden die Ergebnisse der Messungen der Abhängigkeit der Koerzitivkraft von der plastischen Deformation für Eisen, Nickel einige deren magnetisch weiche Legierungen und weiter für Mumetall und Molybdänpermalloy angeführt. Bei einigen der angeführten Werkstoffe wurden interessante Anomalien im Verlauf der Abhängigkeit von H_c von der plastischen Deformation gefunden. Es wird ein wesentlich niedrigerer Wert von H_c für Nickel angeführt, als gewöhnlich angegeben wird, und eine Begründung für diesen Unterschied angeführt.     

Existence theorems and Hyers-Ulam stability for a class of Hybrid fractional differential equations with $p$-Laplacian operator

In this paper, we prove necessary conditions for existence and uniqueness of solution (EUS) as well Hyers-Ulam stability for a class of hybrid fractional differential equations (HFDEs) with $p$-Laplacian operator. For these aims, we take help from topological degree theory and Leray Schauder-type fixed point theorem. An example is provided to illustrate the results.     

Crystallization behaviour of Ge17Sb23Se60 thin films

The crystallization behaviour of as-prepared and nucleated Ge₁₇Sb₂₃Se₆₀ thin films was studied by means of differential scanning calorimetry, X-ray diffraction analysis and scanning electron microscopy. Detailed analysis of the non-isothermal crystal growth kinetics was performed; the apparent activation energy, kinetic model and value of the pre-exponential factor were determined. The kinetic behaviour was found to be surprisingly close to the ideal Johnson–Mehl–Avrami nucleation-growth process, with the only non-ideality being the prolonged peak end tail (which may be a specificity associated with certain thicknesses of thin layers). This corresponds to the initiation of crystal growth in agreement with the classical nucleation theory, with the amount of mechanical defects and strains being negligible. The value of the kinetic parameter suggests two-dimensional crystal growth, which is consistent with the idea of macroscopic crystallites growing in a sterically restricted thin layer. A similar conclusion can be made on the basis of direct microscopic observation of the crystallites’ morphology.     

Anelastic Approximation as a Singular Limit of the Compressible Navier–Stokes System

Considering compressible Navier–Stokes system in a slab geometry in the regime when both Mach and Froude numbers vanish at the same rate, we study the behavior of corresponding weak solutions, that are known to exist globally-in-time (for large data). We establish their convergence to a solution of the so-called anelastic approximation when the limit flow is stratified, i.e., the limit density depends effectively on the vertical coordinate.     

Evaluation of mathematical models for flexible job-shop scheduling problems

With the rapid development in computer technologies, mathematical programming-based technique to solve scheduling problems is significantly receiving attention from researchers. Although, it is not efficient solution method due to the NP-hard structure of these problems, mathematical programming formulation is the first step to develop an effective heuristic. Numerous comparative studies for variety scheduling problems have appeared over the years. But in our search in literature there is not an entirely review for mathematical formulations of flexible job shop scheduling problems (FJSP). In this paper, four the most widely used formulations of the FJSP are compiled from literature and a time-indexed model for FJSP is proposed. These formulations are evaluated under three categories that are distinguished by the type of binary variable that they rely on for using of sequencing operations on machines. All five formulations compared and results are presented.