Bulletin of Prydniprovs'ka State Academy of Civil Engeneering and Architecture

9-15

Authors: O. Lysenko, O. Kosynska, S. Gubarev, V. Lazorchyk

Problem statement. Production of metal materials with nanoscaled sizes of structural components relates to priority directions of a science and the up–to–date technologies. Progress in this field demands the deep understanding of interrelations of a chemical compound of alloys and technology factors with the physical properties setting a kinetics of crystallisation process. Effects theoretical and experimental researches of the noted interrelations will form a basis for developing and introduction in sphere of manufacture of special alloys of the new technological solutions providing a controllability by processes of structure formation and production of materials with predicted microstructures and properties that will promote the further development of micrometallurgy amorphous and nanocrystalline alloys. Analyzing of the resent research. The quenching from a liquid state (QLS) is the up–to–date method of production of alloys with metastable crystalline and amorphous structures [7; 8; 12]. The probability formation of similar structures, besides a chemical compound and properties of a material, depends on a thermal mode of process.According to data of operations [3; 6], the basic versions of thermal mode QLS are: - A mode of the continuous decrease in temperature of a melt up to the glass transition temperature which consequence is inhibition of crystallisation processes and material transition in an amorphous state; - A mode including an initial stage of melt supercooling and a stage of a self–heating of the crystallizing volume following at the expense of the latent heat of transformation which promotes formation of polycrystalline structures with the microscale sizes of structural components. Deficiency of the viewed modes is that with their help cannot be obtained nanocrystalline structures formed in the conditions of high–rate nucleation and extremely low growth rates of crystals. Research objective. For the purpose of overcoming of this deficiency and expansion structure formation possibilities of technology QLS in references [5; 11] is offered the method of melt moulding in prior heated (hot) casting–form which allows to create the varied isothermal requirements of a solidification providing reception of a wide spectrum of structural states, including nanocrystalline. In the present, work results of the rated analysis of thermal modes and a crystallisation kinetics castings from easy amorphizing alloy Cu47Ni8Ti34Zr11 (Vit 101), gained by a rapid quenching in hot coppercasting–form are presented. Conclusion. 1. On an example of alloy Vit 101 features of structure formation are explored at moulding in hot casting–form. Determined the interval of casting–form temperature values = (676 –674)K, which providing an establishment of an isothermal mode of a solidification castings, at temperatures on (5–93)K exceeding a glass transition point. 2. It is shown, that at an isothermal stage of process crystallisation is carried out with close to maximum ~(1015 — 1018) m–3×s–1 nucleation rates and very low ~ (10–13 — 10–8) m×s–1 rates of crystals growth, owing to what it is fixed completely crystallized structures with in the average crystal sizes from 63 to 240 nm.

19-27

Authors: V. M. Molokanova, G. Dyomin

Formulation of the problem. Project management has become a recognized methodology in implementing changes in the system at any level, there was a significant number of publications on project management in various areas of social life [1; 5; 6; 8; 16]. However, the methodology of project management is still not enough attention is paid to the formation of social — genuine values and social responsibility project activity «soft component» associated with the increased role of the human factor in the era of knowledge economy. Consideration of this issue is devoted to this article. The aim of the paper is to study the life cycle of the organization's value through the management of a portfolio of projects and the creation of a conceptual model of the evolutionary development of the organization, forming a new strategy of the organization and increase its value. Conclusions. 1. Understanding the nature and causes of spiral nature of systems to look at the development of the organization by managing portfolios of projects from the point of view of its level of development. 2. Diagnosis dominant evolutionary property management company determines the formation and implementation of tsinnistno–oriented portfolio, so that the organization moves to a new level of evolution. 3. The evolutionary development of the organization can be development through the implementation of portfolio management using his techniques, methods and tools. 4. The proposed information–technology enterprise development model defines the attributes required to manage a portfolio of projects. These attributes can be set or added by placing the information in a certain store or get it from the repository. The direction of future research. The proposed model allows for amendments that may be more detailed and more accurately reflect the actual processes of the organization. This extensibility means the possibility of continuing the gradual fragmentation model for individual work tasks and etc. This will see the model with varying degrees of detail, from the overall process of evolutionary development to individual development processes.

32-38

Authors: N. Bratus, M. Kostenko

Relevance. Weight (or area) of the steel elements of constructs is the main criterion for substantiation of the design decision. Essence of the problem and substantiation of the design decision. Analysis of constrictive solutions of centrally–compressed elements fulfilled by using the method of direct selection of cross–sectional area with correction of the known formula for longitudinal bending coefficient calculation. Approved that for flexibility λ = 10…115 and steel C245…C375 the corrected formula of longitudinal bending coefficient is sufficient accuracy within the limits from λ = 25 to λ = 85…105 for steel C245…C375. Bu using the analysis of assortment of stiffeners and square tubes fulfilled approximate formulas for the specific radius of gyration calculation. Research objective. By using the formula of the direct method for selecting the area of the centrally–compressed steel rods fulfilled the analysis of the advantages of square tubes in comparison to coupled stiffeners, the steels of additional strength have been provided efficient as well as the usage of the stiffeners with the high degree of wall thinness. Calculation were made for the centrally–compressed steel rods under computation length = 3 m and elongated efforts N = 200…2000 kN, appropriate diagrams were shown. Conclusion. By using the practice of the direct method for selecting the area the fulfilled calculation gave an opportunity to make such point as: - The advantages of square tubes in comparison to coupled stiffeners depend on elongated efforts N and increasing by amount of efforts decreasing, for example, under the efforts 200 kN the cross–sectional area of coupled stiffeners increases by 60…80 %; - The steels of additional strength have to be used under elongated efforts N more than 1000 kN; - The influence of the wall thinness parameter on the stiffeners can be significant under the elongated efforts less than 1000 kN.

42-50

Authors: O. Lesyk–Bondaruk

Problem definition: The author believes that in the 20th — beg of 21st century Ukrainians were too ignorant of their cultural heritage. There are plenty of cases when architectural monuments are physically destroyed or changed to a great extent for the sake of a newer refurbishment or the so called «restoration». This article is to analyse compositional and planning characteristics of Volyn wooden temples of XVII–XVIII centuries in order to further professionally preserve and recover the temples.The problems of Volyn temples spacious and planning characteristics are discussed in the works of M. Dragan, G. N. Logvyn, L. V. Prybega, I. R. Mogytych, Y. P. Nelgovsky, P. G. Yurchenko, V. V. Chepelyk and others. [1; 2; 5–9; 10]. Scale adjusted and layered drawings have been made for each XVII–XVIII ct. Volyn temple. Simple compositional forms of churches have been traditional for many years in Volyn; wooden churches were mainly built in the villages, laconism of forms is used.