1,721,058 research outputs found
Wojciech Witkowski, Historia administracji w Polsce 1764-1989, 2007
Get PDFRecenzja: Wojciech Witkowski, Historia administracji w Polsce. 1764-1989. Wydawnictwo Naukowe PWN, Warszawa 2007, ss. 47
Artur Korobowicz, Wojciech Witkowski, Ustrój i prawo na ziemiach polskich. Od rozbiorów do odzyskania niepodległości, 1994
Get PDFRecenzja: Artur Korobowicz, Wojciech Witkowski, Ustrój i prawo na ziemiach polskich. Od rozbiorów do odzyskania niepodległo ci. Lublin 1994
Wojciech Witkowski, Aleksander This i Jan Kanty Wołowski – wybitni prawnicy Królestwa Polskiego, 2001
Get PDFReview: Wojciech Witkowski, Aleksander This i Jan Kanty Wołowski – wybitni prawnicy Królestwa Polskiego. Wydawnictwo UMCS, Lublin 2001, ss. 271.
Prawodawstwa martwą literą ujęte same z siebie są bezładne; nabierają dopiero życia i rzeczywistego skutku przez właściwy swój organ, przez sądownictwo, przez skład urzędników sądowych pisał w połowie XIX wieku Aleksander Heylman. Podziela to zdanie Wojciech Witkowski, badacz i znawca dziewiętnastowiecznego polskiego prawa pod zaborami. Zaproponował bowiem w swej najnowszej książce nietypowe ujęcie, które nazwał „biografią pretekstową”. Życiorysy dwóch wybitnych polskich prawników: Aleksandra Thisa i Jana Kantego Wołowskiego stały się bowiem pretekstem do wskazania ważnych problemów epoki: tak z zakresu socjologii historycznej: tworzenia nowej grupy społecznej: inteligencji, jak - przede wszystkim - trudnych sporów prawniczych epoki, tyczących krytycznej akceptacji zasad prawa francuskiego, a w szczególności Kodeksu Napoleona, stosunku do rusyfikacji polskiego prawa w czasach międzypowstaniowych, wpływu praktyki prawniczej na refleksję teoretyczną.Recenzja: Wojciech Witkowski, Aleksander This i Jan Kanty Wołowski – wybitni prawnicy Królestwa Polskiego. Wydawnictwo UMCS, Lublin 2001, ss. 271.
Prawodawstwa martwą literą ujęte same z siebie są bezładne; nabierają dopiero życia i rzeczywistego skutku przez właściwy swój organ, przez sądownictwo, przez skład urzędników sądowych pisał w połowie XIX wieku Aleksander Heylman. Podziela to zdanie Wojciech Witkowski, badacz i znawca dziewiętnastowiecznego polskiego prawa pod zaborami. Zaproponował bowiem w swej najnowszej książce nietypowe ujęcie, które nazwał „biografią pretekstową”. Życiorysy dwóch wybitnych polskich prawników: Aleksandra Thisa i Jana Kantego Wołowskiego stały się bowiem pretekstem do wskazania ważnych problemów epoki: tak z zakresu socjologii historycznej: tworzenia nowej grupy społecznej: inteligencji, jak - przede wszystkim - trudnych sporów prawniczych epoki, tyczących krytycznej akceptacji zasad prawa francuskiego, a w szczególności Kodeksu Napoleona, stosunku do rusyfikacji polskiego prawa w czasach międzypowstaniowych, wpływu praktyki prawniczej na refleksję teoretyczną
How to easily model doubly curved shells with variable radii of curvature
No full textThe studies of shell structures have always been a special topic in structural mechanics due to the complexity of shell geometries. Historically speaking, the first studies involved shallow shells, which include a small curvature effect. This theory can only be applied for shells of rectangular planforms and very high curvature with respect to the shell thickness. Later on, other researchers introduced the differential geometry to investigate thin shells, but generally this mathematical tool is introduced only to present a general framework of a wider problem. In fact, only shells with constant curvature are involved in most of the papers published in the last 70 years. It is very unusual to find works in which doubly-curved shells with variable radii of curvature are presented, mainly because their geometric description is not easy to implement with standard tools. This work aims to present a general framework which has its basis in the mathematical description of a doubly-curved thick body and can be easily solved by using a fast, accurate and reliable numerical tool termed Generalized Differential Quadrature (GDQ) method. The fundamental equations, which are needed to describe the geometry of doubly-curved shells with variable radii of curvature, will be presented. The same equations are discretized and numerically evaluated in order to obtain the geometric parameters of the same shell structures. All these details are essential for obtaining the equations of motions of such structures. It is remarked that no approximation is given on the normal vector (only limited to the discretization used for the GDQ method), because the shell geometric parameters are evaluated in all the discrete point on the actual shell surface. Therefore, the authors are able to mechanically investigate doubly-curved shell structures with variable radii of curvature. The structural theory employed in all the presented numerical applications is a higher order unified formulation, which is able to easily model any kind of first and higher order shear deformation theory for laminated composite shell structures
On extended models of plates based on linear strain gradient elasticity
No full text© 2018 Taylor & Francis Group, London. Here we discuss the possible ways of derivation of two-dimensional (2D) plate equations starting from the three-dimensional (3D) linear strain-gradient elasticity. Among various approaches we consider the direct approach, the through-the-thickness integration procedure and variational approaches based on minimization of total energy functional and other variational principles. We show that the non-classic boundary conditions of the 3D strain gradient elasticity and the reduction method may generally lead to different plate model, in general. As a result, the mechanics of plates based on strain gradient elasticity is broader than the classic theory
On characterization of an elastic network within the six-parameter shell theory
No full textFor an elastic network similar to a fish-net made of orthogonal inextensible fibers we introduce an averaged continuum model that is a deformable material surface with special material properties described within the framework of the six-parameter shell theory
On phase equilibrium of an elastic liquid shell with wedge disclination
No full textBased on the six-parameter shell theory we consider the phase equilibrium of a two-phase liquid membrane containing a wedge disclination. The considered problems are related to modelling of phase transitions in biological or lipid membranes. In order to capture the membrane behavior we consider a special case of elastic shells which energy is invariant under major transformations of a reference configuration and can be treated as an two-dimensional elastic micropolar fluid which can resist bending deformations. Based on variational approach we formulate the equilibrium conditions at a phase interface. As an example, a two-phase state is analysed in the vicinity of a wedge disclination
How to easily model doubly curved shells with variable radii of curvature
No full textThe studies of shell structures have always been a special topic in structural mechanics due to the complexity of shell geometries. Historically speaking, the first studies involved shallow shells, which include a small curvature effect. This theory can only be applied for shells of rectangular planforms and very high curvature with respect to the shell thickness. Later on, other researchers introduced the differential geometry to investigate thin shells, but generally this mathematical tool is introduced only to present a general framework of a wider problem. In fact, only shells with constant curvature are involved in most of the papers published in the last 70 years. It is very unusual to find works in which doubly-curved shells with variable radii of curvature are presented, mainly because their geometric description is not easy to implement with standard tools. This work aims to present a general framework which has its basis in the mathematical description of a doubly-curved thick body and can be easily solved by using a fast, accurate and reliable numerical tool termed Generalized Differential Quadrature (GDQ) method. The fundamental equations, which are needed to describe the geometry of doubly-curved shells with variable radii of curvature, will be presented. The same equations are discretized and numerically evaluated in order to obtain the geometric parameters of the same shell structures. All these details are essential for obtaining the equations of motions of such structures. It is remarked that no approximation is given on the normal vector (only limited to the discretization used for the GDQ method), because the shell geometric parameters are evaluated in all the discrete point on the actual shell surface. Therefore, the authors are able to mechanically investigate doubly-curved shell structures with variable radii of curvature. The structural theory employed in all the presented numerical applications is a higher order unified formulation, which is able to easily model any kind of first and higher order shear deformation theory for laminated composite shell structures
On bending of laminate plates with interfacial stresses
No full textWithin the framework of the first-order shear-deformable plate theory we discuss the deformations of a layered plate with surface/interfacial stresses acting on the plate faces and layer interfaces. We consider the Gurtin-Murdoch model of surface elasticity. For the derivation of two-dimensional governing equations we apply the through-the-thickness integration procedure. As a result we present the constitutive equations for stress resultants and discuss the influence of surface Lamé moduli on the effective properties of the laminate
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