Wyniki wyszukiwania - Biblioteka Nauki

1

Probabilistic Fatigue Design of Structural Components

100%

Jakubczak H.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2005

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tom z. 79

85-104

2

Risks and Implications for Decision-Making Processes Associated with Existing Design Codes or Their Non-Existence

80%

Błachut J. , Sala D.

Decision Making in Manufacturing and Services

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2018

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tom Vol. 12, no. 1-2

5--15

EN

The buckling phenomenon is a perplexing and unresolved issue in many safety critical structures; as a result, it has been heavily regulated. The existence of regulations would normally benefit modern decision-making tools. But there are various obstacles coming from real-life situations. In order to illustrate the above and draw awareness to the problem, the paper chooses the buckling of shells and discusses (i) the case of an internally pressurized dome found in a plane’s fuselage that failed during a routine flight, (ii) a case where advances in structural mechanics challenge the existing design codes (i.e., metallic domes in pressure vessels), and (iii) a case of extracting rich seabed resources where efficient buoyancy units are required. In the last-mentioned case, the paper points towards the use of advanced Carbon Fiber Plastics (CFRPs) and illustrates this by a failed CFRP dome manufactured from a woven fabric (a topic still within the research sphere of activities). Cases of several other industrial failures caused by buckling are also provided. Finally, the paper highlights the risks to the decision-making processes due to the growing tendencies of eliminating the records of disastrous events from public domains through confidentiality arrangements and the erosion of the existing human know-how.

3

Crystallization of the Structural Components of Multiple Remelted AlSi9Cu3 Alloy

70%

Matejka M. , Bolibruchova D. , Kuriš M.

Archives of Foundry Engineering

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2021

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tom Vol. 21, iss. 2

41--45

EN

At present, Al-Si-Cu based alloys (with a typical representative AlSi9Cu3 alloy) represent more than half of the castings used in various industries (automotive, aerospace and electrical engineering). These are most often sub-eutectic (exceptionally eutectic) alloys with a content of 6 to 13 wt. % Si and 1 to 5 wt. % Cu. The aim of the paper is to point out the importance of the evaluation of input raw materials that determines the overall properties of the casting and the costs invested in its production. A negative impact on performance can be expected when using an alloy made up of a high proportion of recycled material, despite its economic benefits. Experimental alloys were evaluated based on the results of crystallization process and a combination of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and deep etching. The effect of remelting and increasing the remelted returnable material in the batch was manifested especially in the crystallization of iron-rich phases. The negative effect of remelting on the structural components was manifested after the fourth remelting. Gradual increase of remelted returnable material in the batch causes harmful changes in the crystallization process.

4

The concept of creation and use of the polycriterial diagnostics systems of enterprise activity

70%

Kuzmin O. Y. , Melnyk O. H. , Shpak N. O. , Muk O. V.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2012

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tom Vol. 1, No 4

23-28

EN

The objective reason for the development of the tendencies causing transition from monocriterial to polycriterial approach in the diagnostics of enterprises’ functioning and the need for a systematic approach in this area is grounded. The concept of formation and use of the systems of polycriterial diagnostics of enterprises on the basis of selection and specification of the key structural elements of such systems is developed.

5

Ocena pewności działania konstrukcji nośnych narażonych na pękanie zmęczeniowe

60%

Jakubczak H.

Diagnostyka

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2005

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tom Vol. 34

79--84

PL

Konstrukcje nośne maszyn wymiarowane w zakresie odporności na pękanie zmęczeniowe muszą wykazywać znaczny nadmiar wytrzymałości zmęczeniowej ze względu na obserwowany rozrzut ich trwałości oraz konieczność zapewnienia bezpiecznej pracy maszyn. Takie przewymiarowanie konstrukcji nośnych prowadzi w efekcie do pewnych kosztów, które mogą przejawiać się w różnej postaci. W referacie przedstawiono analizę pewności działania wybranej konstrukcji nośnej, wykazując jak poziom tej pewności wpływa na możliwy sposób jej uzyskania w zależności od przeznaczenia analizowanej konstrukcji.

EN

Structural and mechanical components designed against fatigue failure have to be over dimensioned due to scatter in the fatigue life and the necessity of safe operation of machines. Such an over dimensioning results in additional manufacturing costs. An example of reliability analysis of a structural component is presented in the paper which shows how the required reliability can be achieved depending on component destination.

6

РЕАЛІЗАЦІЯ МОДЕЛІ ФОРМУВАННЯ ПРОФЕСІЙНОЇ КОМПЕТЕНТНОСТІ НАВЧАЛЬНО-ДОПОМІЖНОГО ПЕРСОНАЛУ ВИЩОГО НАВЧАЛЬНОГО ЗАКЛАДУ В УМОВАХ ІНТЕГРАЦІЇ ФОРМАЛЬНОЇ, НЕФОРМАЛЬНОЇ ТА ІНФОРМАЛЬНОЇ ОСВІТИ

51%

Жихорська О.

Педагогічні науки: теорія, історія, інноваційні технології

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2015

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nr 10(54)

86-96

EN

The results of the study conducted on the professional competence level of the support staff of higher education institutions proved the need in elaboration and realization of an effective model of competence development. Therefore, the research is aimed at establishing the model of professional competence development of support staff and defining the conditions for its implementation. Following the analysis of academic works and pedagogical experience generalization, the author brings forward the model of professional competence development, a holistic and pedagogically sound system which consists of structural components aimed at professional development of the support staff of higher education institutions. The research defines and characterizes its structural components: purpose, targets, principles, methodological approaches, content, forms, methods, criteria, rates and levels of formation, result. The research shows that the main prerequisite for the implementation of the professional competence development model is the integration of formal, non-formal and informal education. This process is aimed at professional competence development of support staff, formation of complex skills which encourage applying acquired knowledge while performing their job duties. The implementation of the professional competence development model includes four components: short-term courses; long-term off-the-job capability development courses; work-based learning and self-learning. The results of the research can be applied for training, adaptation and competence development of support staff of higher education institutions. The investigation, justification and implementation of the model of professional competence development of support staff will ensure the topical educational results from the above mentioned staff and will allow the formation of the system of knowledge, skills and abilities, which are professionally essential and vital for the professional activity. In perspective, the subsequent research should be aimed at measuring the levels of professional competence that support staff has developed in order to demonstrate the effectiveness of the model.

7

Properties of electron beam welded 300M steel

51%

Dudek S. , Karliński W. , Poznańska A. , Śnieżek M.

Prace Instytutu Lotnictwa

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2003

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tom z. 1-2 (172-173)

55-58

EN

Electron beam welding technology of ultrahigh-strength steel of 300M grade was worked up. The steel would replace 30HGSNA steel for such aircraft structural components as landing gear units and wing spars. The weld strength properties meet requirements of AMS 614 E standard for nonwelded specimens and are much higher than of 30HGSNA steel, both welded and parent metal. The welds show good homogeneity and dispersion of properties.

PL

Opracowano technologię spawania wiązką elektronów stali 300M, przeznaczonej do zastąpienia stali 30HGSNA w wykonawstwie wysokoobciążonych elementów konstrukcyjnychkonstrukcyjnych płatowców, takich jak: podwozia i dźwigary. Uzyskano złącza o właściwościach wytrzymałościowych spełniających wymagania normy amerykańskiej AMS6414H dla materiału niespawanego. Złącza odznaczają sie dużą jednorodnością i małym rozrzutem właściwości, które są znacznie wyższe od stali 30HGSNA, spawanej i niespawanej.

8

ФОРМУВАННЯ ХОРЕОГРАФІЧНИХ ТВОРЧИХ ЗДІБНОСТЕЙ ДІТЕЙ МОЛОДШОГО ШКІЛЬНОГО ВІКУ ЯК ПСИХОЛОГО-ПЕДАГОГІЧНА ПРОБЛЕМА

51%

Богута В.

Педагогічні науки: теорія, історія, інноваційні технології

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2016

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nr 1(55)

181-190

EN

In the article on the basis of analysis of scientific psychological, pedagogical and art-study literature a genesis of creative abilities is reflected and the condition of development of the problem in pedagogical theory is found out. Contents of the article represent the results of theoretical part of dissertation research. Finding out the condition of the investigated problem by means of method of content analysis gave an opportunity to define the choreographic creative capabilities of primary schoolchildren as synthesis of properties and internals of personality of a junior pupils, which are formed at presence of the special knowledge and abilities, high motivation to converting activity in combination with creative imagination during creation of dancing character and valued attitude toward implementation of own capabilities in the process of choreographic activity. During realization of analytical research the psycho-physiological features (reasons, emotional-value attitude, thinking, memory, imagination, attention processes) of displaying the investigated quality in junior schoolchildren was taken into account, which gave an opportunity to expose and prove that the problem-heuristic type of study is the most effective for forming choreographic creative abilities as an integrated quality. The practical importance of theoretical research of the problem of forming choreographic creative abilities consists in an opportunity to substantiate criteria (emotional-perceptible, basic individual-functional, value-creative), corresponding indexes and levels of forming the outlined phenomenon in the primary schoolchildren (potentially-creative, adaptive-active and passive-reproductive), to offer authorial methods and pedagogical conditions of their realization (creation of pedagogical comfortable educational environment, motivation of creative interpretational and improvisational activity of primary school children in the process of choreographic activity, usage in organization of educational process of choreographic creative associations, innovative forms and methods, enriching experience of searching activity through mastering of general cognitive abilities, integration of choreographic art with other types of aesthetic art (musical, theatrical, graphic) with their stage-by-stage introduction in educational practical activity of children dancing creative associations at out-of-school educational establishments. The prospects of further research consist in the study of constituents of teachers’ training in relation to providing creative development of junior schoolchildren in choreographic activity.