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The feeling of pain in patients after the surgical procedure
VAŇKOVÁ, Blanka
The Bachelor Thesis with the topic ``Algesthesia of patients after surgery{\crqq} deals with the patient pain and differences in its perception in the postoperative period. To achieve the set out goals, a research in form of questionnaire was carried out. The research set was formed from the patients hospitalized at Surgical Departments of the Hospitals in České Budějovice and Strakonice. The gals of the thesis were fulfilled, because we found out the real situation of the pertinent matter thanks to the research. The Hypothesis 1 was not confirmed, because the majority of the medical personnel checks-up the effects after analgesia. The Hypotheses 2 has been confirmed; the women percept the pain after a surgery stronger than men. The Hypothesis 3 has been confirmed, because the patients after the conduction anaesthesias percept pain less than those after a total anaesthesia. This Bachelor Thesis should make the nurses think about whether they offer enough to calm down the pain, check the effect after serving the analgesia, treat the patient with respect to the type of surgery and individual perception of pain.
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Application of Methods for Unconstrained Optimization in Computation of Normal Contact Vector
Kopačka, Ján ; Gabriel, Dušan ; Plešek, Jiří ; Ulbin, M.
The stability of the contact algorithm using the penalty method is significantly affected by choosing of the penalty function. The penalty function is defined like a magnitude of the penetration vector multiplied by the users-defined constant - the penalty parameter. The penetration vector is obtained by solution of the minimum distance problem between the node/Gaussian integration point and the segment of the element. For a general quadrilateral contact segment this task leads to the system of two nonlinear equations. It is shown that the popular Newton-Raphson method is inadvisable for this problem. In this paper, alternative methods like quasi-Newton methods, gradient methods and the simplex method are presented. Especial attention is put on the line-search method that is crucial for a general success of quasi-Newton methods as well as gradient methods. All mentioned methods are tested by means of numerical example, which involves bending of two rectangular plates over a cylinder.
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Návrh jeřábových komponent pomocí FEM s uvažováním kontaktních podmínek
Šraml, M. ; Potrč, I. ; Gabriel, Dušan
In several construction components of crane mechanisms, the stress distributions can significantly depend on the way two elements come into contact with each other under loading. The three non-linear contact analysis were performed including the contact between screw threads in a system of crane hook and nut, the contact in the wheel/rail system at crane devices and the counterweight bar connection joint of boom crawler crane. An accurate prediction of localized contact stress is necessary for the fatigue life and the potential failure of the crane components.
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FETI decomposition method applied to solution of contact problem with large displacements
Dobiáš, Jiří ; Pták, Svatopluk ; Gabriel, Dušan ; Dostál, Z. ; Vondrák, V. ; Horák, D.
The paper deals with application of the FETI (Finite Element Tearing and Interconnecting) method to finite element solution of contact problems while taking into account another nonlinearity, namely the large displacements and rotations. We show, in terms of numerical experiments (i) performance of the algorithms stemming from the FETI method, in particular its numerical and parallel scalabilities and optimelity of the dual penalty, and (ii) solution of a Hertzian contact problem, i.e. achieved accuracy of the numerical solution by comparison with the analytical one, and the convergence rate.
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Loosening of press - fitted pivots
Dobiáš, Jiří ; Höschl, Cyril
If a press-fitted clamped-free pivot is exposed to alternating loading at its free end while the forces act normal to its central axis, a gradual global displacement of the pivot in the axial direction may occur under some circumstances.
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Symetrický kontaktní algoritmus pro řešení dynamických rázových úloh
Gabriel, Dušan ; Plešek, Jiří
A three dimensional contact-impact algorithm based on the pre-discretization penalty method is presented. It is shown that the proposed method preserves a symmetric treatment of mutually contacting surfaces. The symmetry of the algorithm is tested by a dynamic contact problem when the impact of two cylinders as in the Taylor test is studied. Comparison of the proposed algorithm with the finite element code MARC is made.
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