structure

The influence of the сatalyst type on the process of esterification of 3-methyl-crotonic acid is investigated. The reaction rates and the influence of the nature and structure of a catalyst on k-value of the esterification reaction are determined. Досліджено вплив виду каталізатора на естерифікацію 3-метилкротонової кислоти, визначено константи швидкості та встановлено вплив природи та будови каталізатора на константу рівноваги у реакції естерифікації. 

The paper studies the theoretical calculations of the material and human resources that is needed for manufacturing and construction the spatial grid-cable steel-concrete composite slab. Some comparative characteristics of the construction were estimated such as weight, bearing capacity etc. The spatial grid-cable steel-concrete composite slab is the new kind of a construction for long-span roofs and shells. The feature of the construction is in its the constructive concept. This construction consists of the diagonal members, the top and the bottom chords.

This paper belongs to the field of systems engineering and is aimed at improving the qualitative indices of information technologies or systems with multidimensional characteristics (e.g. vector data coding design) with respect to reliability, precision and other significant operating characteristics of the systems based on the combinatorial configurations theory, namely the principle of optimal cyclic proportions (OCP).

This paper belongs to the field of systems engineering and is aimed at improving the qualitative indices of vector data information technologies (e.g. 2D vector data coding design) with respect to reliability, precision and other significant operating characteristics of the systems based on the combinatorial configurations theory, namely the Ideal Ring Bundles (IRB)s.

This paper analyzes the background of the process of SEO-optimization, carried description of the main types of services provided to businesses with promotion of internet resources and analyzes the main stages of SEO. The methodological basis for building an automated system optimization and Seo-formulated conclusions on the possibility of its design using modern programming technologies.

The article raises questions of administrative and legal status of executive power. Expands the system of executive power, forms and methods of work. The features of the construction and operation of executive agencies, their structure, function, scope and nature of competence, the relationship between the organs of higher and lower levels.

Purpose. To perform a comparative analysis of record forms and earthquake spectrograms and explosions in quarries and mines what located in area of Kriviy Rih iron-ore basin (Kryvbas) for detection of seismic event signs of different nature this region with magnitude Mb ≥ 3,0 is the research object. Methods.

The role of the structural peculiarities of electrical conducting polymer composites (ECPC) has been considered. Different conception on the nature of the conductivity, the mechanisms of charge transfer in heterogeneous structures are presented in this review. Experimental results obtained by different scientists are only partially in concordance with existing theoretical models.

The complete similarity of reinforcement degree behaviour has been shown for nanocomposite epoxy polymer/Na+-montmorillonite and polyarylate, which is considered as the natural nanocomposite. The polyarylate structure description is given within the framework of cluster model of polymers amorphous state structure. The interfacial adhesion level influences strongly the reinforcement degree of indicated materials.