1,040 research outputs found
Micro-structured materials: inhomogeneities and imperfect interfaces in plane micropolar elasticity, a boundary element approach. Supporting material.
No full textSupporting FEniCS-based finite element method solver and Docker image used to generate the FEM results in the paper:Micro-structured materials: inhomogeneities and imperfect interfaces in plane micropolar elasticity, a boundary element approach. Elena Atroshchenko , Jack S. Hale, Javier A. Videla, Stanislav Potapenko, and Stéphane
P.A. Bordas.This is a permanent archival and DOI citation for the material in the repositories below. It is easiest to use the Bitbucket repository and the Dockerhub to get the supporting materials.</div
Analysis of care in patients at risk for arterial hypertension in pharmacy I.
No full textAnalysis of care in patiens at risk for arterial hypertension in pharmacy I. Author: Stanislav Gregor1 Tutor: Josef Malý1 Consultant: Stanislav Havlíček2 1 Department of Social and Clinical Pharmacy, Charles University in Prague, Faculty of Pharmacy in Hradec Králové 2 Czech Chamber of Pharmacists, Prague Introduction: Arterial hypertension represents a serious health problem. Despite of the fact that great attention is paid to an early diagnosis and therapy of arterial hypertension, it remains compensated insufficiently in a number of patients. Objectives: The aim of the thesis was to analyse the possibilities of pharmaceutical care provided to patients who are at risk of arterial hypertension. Methodology: Blood pressure was measured from the beginning of October till December 2012 in a public pharmacy in Moravská Třebová. The blood pressure was measured by a pharmacist by means of a validated and calibrated tonometer. Other data were collected from a directed interview with the pharmacy client. The data were evaluated in Microsoft Excel 2007 and processed by means of the frequency analysis. A retrospective analysis of drug problems was further performed in patients who have been using pharmacotherapy or food supplements. Results: The data were obtained from 196 pharmacy clients (31 % of men and..
Funeral of General Stanislav Čeček in Prague
No full textThe segment captures the funeral of the Zborov hero, General Stanislav Čeček, held in Prague on 5 June 1930. The coffin with the deceased is transported from the Pantheon of the National Museum to the National Liberation Monument in Žižkov. The funeral procession includes not only representatives of the Czechoslovak Legions but also Prime Minister František Udržal and Minister of Supplies Rudolf Bechyně. General Rudolf Medek delivers a speech over the the late hero´s coffin (silent)
GLIFO System and Symbolic Resolution of Quantum Problems
No full textThis project introduces the GLIFO (0–9) symbolic system for resolving high-complexity quantum equations, including the multi-body Schrödinger equation. A non-numerical method that simulates state convergence using symbolic resonance. Author: Shvardak Stanislav.## License
This project is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2025 Shvardak Stanislav – [email protected]
Link to license: https://creativecommons.org/licenses/by/4.0
In memory of Stanislav Martinát (1976–2023)
No full textOn Sunday, August 13, 2023, Stanislav Martinát – a respected Czech geographer and member of the Editorial Board of Moravian Geographical Reports journal – died after a short serious illness at the age of 47. Despite his relatively young age, Stanislav Martinát was one of the most productive and the most cited Czech geographers. He is the author or coauthor of over 100 peer-reviewed articles, of which more than 70 were published in journals indexed in the Web of Science database. This article is a collection of personal memories from people from different workplaces from several countries who had the opportunity to work with Stanislav (Standa) and to share a part of their life stage with him
GLIFO System and Symbolic Resolution of Quantum Problems
No full textThis project introduces the GLIFO (0–9) symbolic system for resolving high-complexity quantum equations, including the multi-body Schrödinger equation. A non-numerical method that simulates state convergence using symbolic resonance. Author: Shvardak Stanislav.## License
This project is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2025 Shvardak Stanislav – [email protected]
Link to license: https://creativecommons.org/licenses/by/4.0
Stress Intensity Factor for a Crack Embedded in an Infinite Matrix under the Assumption of Plane Micropolar Elasticity
No full textIn last few decades, studies on defining mechanical behaviour of materials with significant microstructure have increased drastically. This is due to the lack of compatibility between the experimental data of mechanical behaviour of such materials and obtained results from classical elasticity theory. Moreover, with growing demand and need of using microstructural materials such as polymers and composites in mechanical, physical, and engineering applications, it has become crucial to have a good insight about their behaviour and how to analyse it.
As mentioned before, the classical theory cannot provide suitable formulae to model the behaviour of microstructural materials. Thus, a new theory had to be developed in order to describe such materials. The basis of a new elasticity theory, which considers the microstructure of materials, was formed during the 1950s. This theory is known as Cosserat theory of elasticity or micropolar elasticity.
An effective way to solve the problems in Micropolar elasticity is to use the boundary integral method. Nevertheless, this method forces some limitations on the properties of boundaries of considerate domains. To be more specific, this method demands more detail to characterize the boundary. By using this method, boundaries can be defined and presented by a twice differentiable curve. As a result, it cannot be applied on domains with reduced boundary smoothness, or the ones containing cracks or cuts. Hence, there is a need of finding methods to define irregular boundaries. There has been some research in this particular area, however this issue has not been completely addressed.
In order to overcome this difficulty of defining irregular boundaries, an advanced mathematical approach can be used. This method includes using the distribution setting in Sobolev spaces to formulate the corresponding boundary value problem. The benefit of using this method is finding the appropriate weak solution in terms of integral potentials, which works perfectly for the aforementioned boundaries.
In this work, boundary integral equation method has been used to find the integral potentials which are the exact analytical solutions, for the corresponding boundary value problems. Moreover, the boundary element method has been used to approximate these exact solutions numerically. Then these solutions can be applied in many practical engineering problems.
As an illustration of the importance of this method, then a crack in a human bone was modeled and solved using these solutions. The bone assumed to follow plane Cosserat elasticity. The stress intensity factor around this crack was calculated and compared to classical analysis. The results approves the high effect of microstructure of the material in stress distribution around the crack
Numerical Analysis of Debonding Mechanisms of Externally Bonded FRP Reinforcement in RC Beams
No full textThere is an urgent need to develop economic and efficient methods to repair and strengthen existing reinforced concrete structures. This demand is motivated by several factors including the aging of concrete structures, the desire to upgrade design standards, and the exposure to severe environmental effects. A particular problem confronting engineers in repairing deteriorated structures is the rehabilitation of reinforced concrete elements. Conventionally, steel plates were utilized to restore and enhance the tensile strength of damaged concrete members. Despite the effectiveness of this practice in terms of improving the structural capacity, it is still considered disadvantageous due to the excessive weight of steel and its susceptibility to corrosion in moist environments. The application of fibre reinforced polymer (FRP) to existing reinforced concrete structures has gained the interest of many researchers in the last few decades. These materials are superior to steel when it comes to comparing the resistance to electrochemical corrosion, strength-to-weight ratio, ease of handling, fatigue resistance, and availability in any length or shape. However, there is still a serious concern regarding the effect of premature debonding of the FRP plates before reaching the desired strength or ductility. This debonding can initiate from the ends of the plate or can be induced by intermediate cracks in the concrete member. Although the end-plate debonding and peeling mechanisms have been studied extensively, there is still a significant lack of data for FRP-strengthened beams in which intermediate crack-induced debonding is the dominant failure mode. On the other hand, the interfacial bond capacity between the concrete and the FRP composite has not been thoroughly investigated. Whereas, there is still need to study the effect of some of the mechanical and physical parameters on the bond strength of FRP-Concrete interface. Moreover, researchers have also shown a keen interest in simulating flexural cracks in concrete beams, and examine their effect on the debonding mechanisms of FRP materials. However, more realistic approach is needed to model cracks and account for their growth.
In this study, a three-dimensional nonlinear finite element model was developed for simulating the flexural behaviour of RC beams externally bonded with FRP systems. The ABAQUS/CAE software version 6.14-2 was used for this purpose. This numerical analysis was performed based on a comprehensive experimental program conducted by Brena et al. (2003). The simulated RC beams were categorized in two groups: Control Beams (without fibre) and CFRP Beams (with carbon fibre reinforced polymer). During the process of constructing the CFRP beam models, two distinct procedures were followed to simulate the interface between the concrete and the externally attached FRP laminates. Perfect bond was assumed in the first approach, and a Cohesive Zone Model (CZM) was adopted in the second approach. In the latter, cohesive surface technique was implemented in the ABAQUS model through the use of traction-separation law. Despite the lack of quantitative evaluation in the literature as no similar techniques was attempted by others, the results of this numerical analysis were only compared with experimental findings, and the proposed models were found to be reliable.
A parametric study was performed to investigate the influence of various parameters on the flexural capacity of the proposed beam model, and the debonding behaviour of the externally attached FRP laminate. This analysis was conducted by either changing the mechanical properties of some of the constitutive materials (e.g. concrete and reinforcing steel), or altering the geometrical and mechanical properties of the FRP reinforcement. It was then found that the effect of internal steel reinforcement ratio has the most impact on beam ultimate capacity. While changing the FRP bond length beyond a certain value bears no effect on beam strength.
Moreover, the numerical model was modified to review the effect of intermediate crack spacings on the overall beam performance. A discrete crack approach was adopted to replicate crack propagation throughout the body of the beam. This technique has shown an approximately 30% improvement in the prediction capacity of this model when compared to a similar specimen in which smeared crack approach is used. The results of this analysis showed that the debonding behaviour of FRP laminates is largely influenced by crack spacing. In addition, the results have also indicated that the initiation of FRP micro-debonding was prolonged as crack spacings were decreased. This response can be attributed to the abrasion effect within the FRP-Concrete interface. Finally, this numerical analysis provides a relatively reliable guidance on the application and the mitigation of externally bonded FRP reinforcement in concrete beams. The predictive capability of the proposed FE models ensures their suitableness for further investigations of FRP effectiveness in civil engineering field
Yuriy Izdryk and the Stanislav phenomenon : postmodernists or "postmodernized" avant-garde?
No full textThe writers of the Stanislav Phenomenon according to a lot of Ukrainian literary scholars are the most representative branch of the Ukrainian postmodernism. This text tries to answer the question that members of this group are really postmodernists or rather they create some kind of the modern avant-garde. The author presents a story of the beginning of the Ukrainian postmodernism and the idea of the "postmodernized modernism" invented by Włodzimierz Bolecki. Based especially on the three novels of Yuriy Izdryk, one of the representative of the Stanislav Phenomenon, author tries to prove that the Ukrainian postmodernism does not exist but really is the "postmodernized" avant-garde
Chronology and origin of «the Alakul culture» in the Trans-Urals. Reflections on the Stanislav A. Grigoriev concept
No full textThe paper is devoted to criticism of the concept of Alakul culture origin and history proposed by Stanislav Grigoriev. The author casts doubt on Stanislav Grigoriev opinion about the dating Alakul sites in the Trans-Urals within two separate time periods and about a direct genetic link of Alakul population and inhabitants of Sintashta sites
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