Analysis of rock massif based on the theory of damage

This paper deals with analysis of rock massif in connection with a planned deposit of nuclear waste. This problem has emerged with renessaince of nuclear power plants which are now considered as a stable and relatively clean source of electrical energy. The deposits are located deep in rock massif and analysis of stress redistribution caused by cave drifting and temperature changes is required. Difficulties with solution of systems of non-linear algebraic equations were discovered and two variants of the arc-length method were tested

The theological basis for the charitable activites of the Christian Church

Teologická východiska charitativní činnosti křesťanské církve. Práce je zaměřena na oblast charitativního působení křesťanské církve dnes známé pod pojmem diakonie, charakterizované jako služba lásky druhým, která je v současné době považována za jeden z klíčových, tedy konstitutivních prvků fundamentální struktury církve. Na základě rozborů vztahů mezi jednotlivými teologickými disciplínami, zejména však biblistiky, systematické teologie a křesťanské sociální etiky, to vše v kontextu poznatků biblické hermeneutiky, identifikuje charitní ideu křesťanské církve jako společenství lásky ve službě trpícímu člověku. Zásadním určujícím rysem charitativní diakonie je Boží láska a od ní se odvíjející struktura hodnotového systému, který je pro křesťanskou církev specifický a zásadní. Klíčová slova charitativní práce, diakonie, služba lásky, křesťanská sociální etika, katolická sociální naukaThe theological basis for the charitable activities of the Christian Church. The thesis focuses on the charitable work of the Christian Church today known as Diakonia, characterised as a service of love to others, which is currently considered one of the key, i.e. constitutive elements, of the fundamental structure of the Church. Based on analyses of the relations between theological disciplines, particularly Biblical, systematic theology and Christian social ethics, it identifies the Christian Church's idea of charity as the communion of love in the service of those who suffer. A fundamental defining characteristic of the Diakonia charity is God's love and the structure of the assessment system that unfolds from it that is specific and essential for the Christian Church. Keywords Charitable work, Diakonia, service of love, Christian social ethics, Catholic social teachingDepartment of Theological Ethics and Theology of SpiritualityKatedra teologické etiky a spirituální teologieCatholic Theological FacultyKatolická teologická fakult

Hygro-Thermo-Mechanical Analysis of a Reactor Vessel

Determining the durability of a reactor vessel requires a hygro-thermo-mechanical analysis of the vessel throughout its service life. Damage, prestress losses, distribution of heat and moisture and some other quantities are needed for a durability assessment. A coupled analysis was performed on a two-level model because of the huge demands on computer hardware. This paper deals with a hygro-thermo-mechanical analysis of a reactor vessel made of prestressed concrete with a steel inner liner. The reactor vessel is located in Temelín, Czech Republic

Hygro-Thermo-Mechanical Analysis of a Reactor Vessel

Determining the durability of a reactor vessel requires a hygro-thermo-mechanical analysis of the vessel throughout its service life. Damage, prestress losses, distribution of heat and moisture and some other quantities are needed for a durability assessment. A coupled analysis was performed on a two-level model because of the huge demands on computer hardware. This paper deals with a hygro-thermo-mechanical analysis of a reactor vessel made of prestressed concrete with a steel inner liner. The reactor vessel is located in Temelín, Czech Republic

An improved return-mapping scheme for nonsmooth yield surfaces: PART I - the Haigh-Westergaard coordinates

The paper is devoted to the numerical solution of elastoplastic constitutive initial value problems. An improved form of the implicit return-mapping scheme for nonsmooth yield surfaces is proposed that systematically builds on a subdifferential formulation of the flow rule. The main advantage of this approach is that the treatment of singular points, such as apices or edges at which the flow direction is multivalued involves only a uniquely defined set of non-linear equations, similarly to smooth yield surfaces. This paper (PART I) is focused on isotropic models containing: $a)$ yield surfaces with one or two apices (singular points) laying on the hydrostatic axis; $b)$ plastic pseudo-potentials that are independent of the Lode angle; $c)$ nonlinear isotropic hardening (optionally). It is shown that for some models the improved integration scheme also enables to a priori decide about a type of the return and investigate existence, uniqueness and semismoothness of discretized constitutive operators in implicit form. Further, the semismooth Newton method is introduced to solve incremental boundary-value problems. The paper also contains numerical examples related to slope stability with available Matlab implementation.Comment: 25 pages, 10 figure

UTILIZATION OF IMAGE AND SIGNAL PROCESSING TECHNIQUES FOR ASSESSMENT OF BUILT HERITAGE CONDITION

Historical buildings represent invaluable heritage from the past and therefore their protection is a very important task. Assessment of their condition must not cause damage accumulation, thus the least possible volume removed from the structure is essential. As many historical buildings in the Czech Republic are built using sandstone that can be considered as a typical heterogeneous system, statistical signal processing is a promising approach for determination of the representative volume element (RVE) dimensions. Such calculations can be carried out on the domain of logical arrays representing binary images of the materials microstructure. This paper deals with processing of image data obtained using SEM-BSE and high resolution flatbed scanner for determination of RVE dimensions. Advanced image processing techniques are employed and results from calculation using grayscale data are presented and compared with results calculated on the basis of color input images