Transformation of the force - deflection diagram under a three-point-bending into the stress - crack opening relationship

V příspěvku je popsán analytický přechod z diagramu závislosti průhybu vzorku z betonu s příměsí polypropylenových vláken na velikosti zatěžovací síly na vztah mezi napětím a rozevřením trhliny v tahu za ohybu. Transformace je založena na kinematickém popisu chování testovaného vzorku. Napětí je aproximováno kombinací exponenciálních funkcí doplněnou o člen vystihující prokluz vláken přemosťujících trhlinu.In this paper, an analytical form of the transformation from the force – deflection diagram obtained under a three-point bending into the stress – crack opening relationship of concrete with polypropylene fibers is outlined. The transformation is based on the description of the kinematic behavior of the test sample. The stress is approximated by a combination of exponential functions supplemented with a term capturing the slip of fibers bridging the crack

Commented translation

Tato práce popisuje proces překladu první kapitoly elektrotechnické učebnice z ČVUT. Tento překlad bude použit budoucími studenty ERASMU, kteří přijedou do Prahy studovat elektrotechniku. Tato práce se skládá ze seznamu vysvětlených překladových teorií, samotného přeloženého textu, demonstrací teorií na přeloženém textu a závěru s osobními zkušenostmi získanými tvořením této práce.This thesis is concerned with the full description of the process of translation of the first chapter of ČVUT electro-engineering textbook. This text will be used by future ERASMUS students coming to Prague to study electro-engineering. This thesis consists of an explained list of translation theories, the translated text itself, demonstration of mentioned theories and conclusion with personal experience.

Analytical model of composite floors with steel fibre reinforced concrete slab subjected to fire

Under fire, membrane action plays an important role in the performance of slabs subjected to large deflections. In this paper, a new model is proposed based on a proper approximation of horizontal displacements for a simply sup­ported composite slab. The novelty of the proposed approach consists in a special treatment of the system of shape func­tions for the “in-plane” displacements. Moreover, a load applied to the slab is divided into two components, so that one component is balanced by the membrane forces, while the second one is transmitted by the bending forces (including transfer of shear and moment). The deflection due to thermal elongations is replaced by the identical deflection caused by a fictitious load. Unknown parameters are calculated using the principle of virtual displacements. The effectiveness of the model is validated by the results obtained from experiments. First published online: 25 Nov 201

Analysis of coupled heat and moisture transfer in masonry structures

Evaluation of effective or macroscopic coefficients of thermal conductivity under coupled heat and moisture transfer is presented. The paper first gives a detailed summary on the solution of a simple steady state heat conduction problem with an emphasis on various types of boundary conditions applied to the representative volume element -- a periodic unit cell. Since the results essentially suggest no superiority of any type of boundary conditions, the paper proceeds with the coupled nonlinear heat and moisture problem subjecting the selected representative volume element to the prescribed macroscopically uniform heat flux. This allows for a direct use of the academic or commercially available codes. Here, the presented results are derived with the help of the SIFEL (SIimple Finite Elements) system.Comment: 23 pages, 11 figure

Commented translation

Tato práce popisuje proces překladu první kapitoly elektrotechnické učebnice z ČVUT. Tento překlad bude použit budoucími studenty ERASMU, kteří přijedou do Prahy studovat elektrotechniku. Tato práce se skládá ze seznamu vysvětlených překladových teorií, samotného přeloženého textu, demonstrací teorií na přeloženém textu a závěru s osobními zkušenostmi získanými tvořením této práce

Visual tools for mental processes support

Title: Visual tools for mental processes support Author: Bc. Jiří Šejnoha Department: Department of Applied Mathematics Supervisor: doc. RNDr. Zdeněk Hedrlín, CSc. Abstract: The idea of work is the use of nonlinear model of mental processes as a means of representation considerations (the projection of the human mind), with thesis so registered thoughts, compared to a standard linear form of written text, to better understand particularly complex considerations, their contexts, integration and support their utříbení. Model mental processes is designed based on inspiration by buoy (Herbart's) and while model. The following discussion of its limits, and the legitimacy of comparing with similar models: Model Theater, MoM, Carnap's model of the mind and NOGA model. Implementation of the work includes a formalization of the design model. The draft also implementation and implementation, which is then used to verify the thesis contribution for users using a questionnaire. The results are discussed and on this basis is formed by the end. Keywords: mind, mental process, model, understanding, tool, whil

Visual tools for mental processes support

Title: Visual tools for mental processes support Author: Bc. Jiří Šejnoha Department: Department of Applied Mathematics Supervisor: doc. RNDr. Zdeněk Hedrlín, CSc. Abstract: The idea of work is the use of nonlinear model of mental processes as a means of representation considerations (the projection of the human mind), with thesis so registered thoughts, compared to a standard linear form of written text, to better understand particularly complex considerations, their contexts, integration and support their utříbení. Model mental processes is designed based on inspiration by buoy (Herbart's) and while model. The following discussion of its limits, and the legitimacy of comparing with similar models: Model Theater, MoM, Carnap's model of the mind and NOGA model. Implementation of the work includes a formalization of the design model. The draft also implementation and implementation, which is then used to verify the thesis contribution for users using a questionnaire. The results are discussed and on this basis is formed by the end. Keywords: mind, mental process, model, understanding, tool, whil

Simulation of Stock Exchange

The topic of this work is simulation of stock market. Studying the dependence of Prague stock exchange index PX depending on the macroeconomic parameters. It uses the connection methods, neural networks and random walks, where the random walk forward trained neural network functions as decision-making unit, normally used instead of linear approximation. Specially concerning the relationship of dependence PX on exchange rate U.S. dollar and Czech crown, gross domestic product of the Czech Republic and 2W repo rate. Simulation is performed using neural networks and linear approximation to the historical dates against them is then validated