Jan Evangelista Purkyne University

Ústí nad Labem, Czech Republic

Jan Evangelista Purkyne University

Ústí nad Labem, Czech Republic

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Raska P.,Jan Evangelista Purkyne University | Klimes J.,Czech Institute of Rock Structure And Mechanics | Dubisar J.,Jan Evangelista Purkyne University
Land Degradation and Development | Year: 2015

Historical documentary sources from two regions with contrasting historical and social development were examined for information about landslide occurrence and characteristics. The archive search was complemented with limited field work to acquire information about the degree of recent landslide activity and land use. The results from two study areas (Ústí nad Labem in North Bohemia and Zlín in East Moravia) show considerable differences in the types of historical documentary source, their availability and the information they record. It is concluded that local newspapers that include special sections focusing on regional events are the best data sources for the landslide study. The reliability of the acquired historical landslide occurrence frequencies is generally not very good, but it does show notable regional differences caused by not only the availability of documentary sources but also the dynamics of the natural processes responsible for the landslide events. A reconstruction of the landslide activity during the last 70 or more years was carried out for selected sites. The reconstruction showed that the occurrence of historical landslides is only rarely respected in recent land use within both studied urban areas. Historical landslide information could be well used for site-specific landslide hazard assessment. Nevertheless, the use of this information to construct a historical landslide database on the regional or country level is limited only to certain regions of the Czech Republic. © 2013 John Wiley & Sons, Ltd.


Kusmierczak S.,Jan Evangelista Purkyne University
Engineering for Rural Development | Year: 2011

The paper examines the influence of the corrosive effect on the change of microstructure of titanium alloys, which are often used as a replacement material for the human body. These alloys are generally among the corrosion resistant alloys, but the requirements for their resilience in case of implants are still extreme. The corrosion tests were carried out using standard corrosion tests in salt spray environment. The aim was to evaluate the corrosion resistance of titanium alloy, and compare the changes in the structure of the material depending on the length of exposure to corrosion.


Naprstkova N.,Jan Evangelista Purkyne University
Engineering for Rural Development | Year: 2011

The education of CAx applications is an important part of university education. With financial help of the Higher Education Development Fund of the Ministry of Education, Youth and Sports of the Czech Republic it was possible at the Faculty of Production Technology and Management, University of Jan Evangelista Usti nad Labem to realize the education of important software CAD/CAM/CAE representative CATIA V5. At present, therefore, the FPTM UJEP can offer to the students the education of the software, which is often used in companies engaged in production for the automotive industry. The paper describes the deployment of software to education, summarizes and outlines its potential and profits that may result from this commitment to students.


Naprstkova N.,Jan Evangelista Purkyne University
Engineering for Rural Development | Year: 2011

The paper describes the design of the experiment, through which FPTM students can participate in influence analyzes of different hard particles caused by inoculation and modification of certain aluminum alloys. Such analyzes are currently solved at DTMI FPTM JEPU in Ústí nad Labem and engaging students in such experiments is one of such opportunities for students themselves to gain practical experience and knowledge from the experiment itself and also to try using different instruments, which are available at the DTMI FPTM.


Nangolo F.N.,Jan Evangelista Purkyne University
Applied Mechanics and Materials | Year: 2014

Modal parameter estimation is the estimation of frequency, damping ratio, and modal coefficients from experimental data. Modal analysis techniques are a common method used to determine these properties. The Least-Squares Complex Exponential (LSCE) and the Eigensystem Realization Algorithm (ERA) are one of the popular methods of modal analysis techniques. This paper presents an experimental verification of the LSCE and ERA methods. The investigation focuses on the estimation of natural frequencies, damping ratio and modal coefficients. To investigate this, artificial analytical data were processed in MATLAB environment to estimate the modal parameters. The identified vibration parameters from the LSCE and ERA were compared with the values based on classical dynamic theory, and the natural frequency and damping ratio's percent of error were calculated. © (2014) Trans Tech Publications, Switzerland.


Kusmierczak S.,Jan Evangelista Purkyne University
Engineering for Rural Development | Year: 2015

Teaching technical subjects is generally based on theory. But for the manufacturing sector practical knowledge is important. Therefore, it is important to give students the opportunity to work on solving specific technical problems. According to these solutions students should be allowed to work on modern devices. This will increase their competencies, thus opening the way to the labour market. The article presents an example of the use of modern technical equipment for finding the causes of degradation of specific technical parts during the seminar work of "Construction materials and limit states".


Kusmierczak S.,Jan Evangelista Purkyne University
Engineering for Rural Development | Year: 2015

Degradation of parts brings not only a change of defined characteristics and shortening product life. For mass-market products, in adverse cases degradation may cause refraction, which may cause the risk of life for users. Common procedure in the analysis of causes of degradation is engineering already degraded components. There are many methods for evaluation of materials. In this article is presented as an example of the procedure and methodology applied in the search for the causes of degradation of the chosen part. On the degraded part of the core such methodology of evaluation was used, which was based on complex analysis of internal and external factors which could cause degradation of the examined component. Selection of appropriate analysis methodology thus leads to successful detection of causes of degradation of the material components.


Svobodova J.,Jan Evangelista Purkyne University
Engineering for Rural Development | Year: 2015

The article is focused on evaluation of the chemical pre-treatments applied on steel substrate using the electron microscope. The most important aim of chemical pre-treatment is the removal of contaminants, corrosion products etc. from the material surface and obtaining such a basic material surface, which will provide sufficient corrosion resistance of the base material and suitable conditions for adhesion of paints or other finish coatings to steel material. The paper focuses on the evaluation of chemical pre-treatments excluded on low-carbon steel sheet using SEM and EDS analysis. The carbon steel sheet had excluded coatings of chemical pre-treatments (Fe phosphate, coating based on nanotechnology) and the character of excluded layers on an electron microscope at different magnifications has been studied. Nanotechnology based product is a technology, which can in the future replace the classical phosphating process because it should provide better corrosion resistance of pre-treated materials (as the producer states). These products create the nanolayer on the material surface which is created by sol-gel technology. The main goal of our research is testing of this product and comparing with the Fe phosphating process. It is a part of extensive research.


Cirus L.,Jan Evangelista Purkyne University
DT 2014 - 10th International Conference on Digital Technologies 2014 | Year: 2014

The goal of this conference paper is to give information about the problematics of primary computer and information literacy among pupils attending elementary school. Furthermore the paper describes a process of making and evaluating of an accomplished survey which aim was to analyze a present state of primary computer and information literacy by a form of questionnaire. Literacy as a concept is described first then the primary computer and information literacy as such follows. Hereafter this paper deals with computer and information literacy's grades that are defined by curricula documents. Afterwards the actual possibilities of how to map a present state of primary computer and information literacy among pupils attending elementary school are put forward and the qualifications of their very teachers in a field of primary information education are assessed. In this conference paper answers for following theses shall be detected: What kind of qualification and precondition does a teacher himself possess for schooling the computer and information literacy? What kind of professional trainings, previews studies or additional pedagogical education of some kind has a responded teacher achieved? In what way do responded teachers themselves assess their pupil's qualifications in the field of computer and information literacy? © 2014 IEEE.


Svoboda M.,Jan Evangelista Purkyne University
Applied Mechanics and Materials | Year: 2014

The article deals with the influence of manufacturing and geometric asymmetry on the vertical oscillation of symmetric and asymmetric systems consisting of rigid bodies linked flexibly with different kinematic excitation. The solution was performed using experimental and numerical analysis (with application of oscillation of vehicles and flexibly coupled machines). Numerical solutions were carried out by finite element method (FEM) on a simple model and experimental solutions on laboratory model of a mechanical system. The aim of the work was to create a numerical model and its solution using the finite element method. The experimental solution was used to verify the numerical model. © (2014) Trans Tech Publications, Switzerland.

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