Opole University of Technology

Opole, Poland

Opole University of Technology is a university located in Opole, Poland.The university was founded in 1959 as a consultative branch of Silesian University of Technology. In 1966 it became an independent university known as Wyższa Szkoła Inżynierska w Opolu . The name Politechnika Opolska is used since 1996.The university has over 500 lecturers and over 12000 students. There are six faculties: Faculty of Civil Engineering Faculty of Mechanical Engineering Faculty of Electrical Engineering, Automatic Control and Computer Science Faculty of Physical Education and Physiotherapy Faculty of Management Faculty of Production Engineering and LogisticsIn 2008, the Opole University of Technology in Cooperation with the Beijing University of Technology have opened the Opole Confucius Institute.Centre for Cooperation Poland-China Confucius Institute is a non-profit public utility institution whose mission is promoting Chinese language and culture. The Institute is working for the benefit of this University and the Opole local community. The Opole Centre is one of the 200 such offices in the world associated in an international web, whose principal office Hanban is situated in Beijing.The Opole University of Technology is also an individual full member of the European University Association . The European University Association represents and supports higher education institutions in 46 countries, providing them with a unique forum to cooperate and keep abreast of the latest trends in higher education and research policies. Wikipedia.

Time filter
Source Type

Opole University of Technology and Zak | Date: 2012-04-04

A method to manufacture a mixture of aliphatic hydroxyesters, especially from isobutyric aldehyde, is characterized by that the isobutyric aldehyde condensation reaction is carried out in the presence of a mixture of sodium hydroxide and sodium isobutyrate as catalyst in a weight ratio of 3:1, first at 58-60% conversions of isobutyric aldehyde to 2,2,4-trimethyl-1,3-pentanediol isobutyrate at temperatures in the range 58-62C during 8-12 minutes and then at 68-72% conversions of isobutyric aldehyde to 2,2,4-trimethyl-1,3-pentanediol isobutyrate at temperatures in the range 88-92C during 3-7 minutes whereupon, from a mixture of 3-hydroxy-2,2,4-trimethylpentyl isobutyrate and 3-hydroxy-2,2-dimethyl-1-(1-methylethyl)propyl isobutyrate, an aqueous solution of the catalyst is separated by allowing to stand and elution from the organic phase of the mixture after the condensation reaction while the process of distillation of the remaining portion of the mixture after the condensation reaction is carried out in four steps.

Beben D.,Opole University of Technology
Engineering Structures | Year: 2013

The paper presents an experimental study on dynamic amplification factors (DAFs), which was conducted on four corrugated steel plate (CSP) culverts. The results of field tests under static and dynamic loads have also been presented. Displacements and strains caused by dynamic loads were higher than obtained from the static test. DAFs were determined on the basis of two methods. In the first method, the static response was directly obtained from static tests. In the second method, the static response was determined based on the filtration of the dynamic response of the culverts. Application of the filtering method on the dynamic response of the culverts in order to obtain the static value does not introduce large errors in the DAFs. In comparison to the first method the difference did not exceed 3%. The DAFs were in the range of 1.116-1.260 for displacements, and 1.105-1.293 for strains. The main factors affecting the DAFs are the span of the culvert, depth of the soil cover and vehicle speed. Conclusions drawn from the study can be helpful in the assessment of dynamic amplification and load rating in CSP culverts. © 2012 Elsevier Ltd.

Beben D.,Opole University of Technology
NDT and E International | Year: 2011

The paper presents the results of selected experimental tests under dynamic loads, which were conducted on a corrugated steel plate (CSP) culvert. The dynamic loads were caused by the passages of various trains. The displacements and vibration frequencies of the culvert were measured. The microwave interferometric radar and inductive gauge were used for monitoring of displacements of this railway culvert. The conventional inductive gauge was applied to verification of results received by the radar. Conclusions drawn from the tests can be helpful in the measurements of such culverts using the microwave interferometry method. © 2011 Elsevier Ltd. All rights reserved.

Janowska-Renkas E.,Opole University of Technology
Construction and Building Materials | Year: 2013

The impact of chemical structure of four new-generation superplasticizers-derivatives of either acrylic acid (denoted as SP-A and SP-B) or maleic acid (SP-C and SP-D) - on their efficiency in cementitious pastes was studied. Gel permeation chromatography (GPC) and Fourier-Transformed Infrared Spectroscopy (FTIR) were applied to investigate the superplasticizers' molecular structure. The performance of a superplasticizer, i.e. reduction in plastic viscosity, was proven to be dependent on its chemical structure. The maleic-based superplasticizers, having longer backbones and side chains as well as carboxylic groups (COO-), thus displaying higher molecular mass and hydrophilicity, are more efficient. On the other hand, the acrylic acid derivatives, with shorter backbones and side chains and without carboxylic groups, appear less efficient. It was also proven that the maleic-based superplasticizers slow the hydration process down to a much greater extent than acrylic acid-derived superplasticizers. © 2012 Elsevier Ltd. All rights reserved.

Malecka J.,Opole University of Technology
Corrosion Science | Year: 2012

The effect of Al 2O 3 coating on oxidation was investigated at 900 and 950°C. Isothermal oxidation testing indicated that coating was very effective in reducing the oxidation rate of γ-TiAl. The technology of magnetron sputtering used in this study allowed the deposition of a coating that ensured the improvement of high temperature oxidation resistance. © 2012 Elsevier Ltd.

The paper is concerned with the investigation of dynamic characteristics, i.e. the natural frequencies and structural damping ratios, of a tall industrial chimney, located in the power station of Belchatow in Poland, excited by the wind, based on GPS measurements using Random Decrement Method (RDM). The GPS receiver was able to measure only the first natural frequency of the chimney. The basic characteristics of a background noise of GPS technology based on the result of a static test were examined thoroughly. In order to increase the accuracy of GPS measurements as well as the dynamic characteristics estimation the filtering procedure using Type 1 Chebyshev band-pass digital filter was adopted. Then, the principles of RDM taking into account the influence of GPS measurement random noise were considered. The influence of filter parameters on the stability of the RD signature was also examined. Based on the filtered record of chimney dynamic response, the dynamic characteristics of the chimney were investigated using RDM for response considered in ten various directions in the horizontal plane. The results delivered some important practical information about two symmetry axes of the chimney. The effective investigation of a damping ratio should be made based on the analysis of the chimney response considered only in the directions of symmetry axes of the chimney. The number of time segments of the chimney response taken into account in averaging of the RD signature as well as the time interval of the RD signature was also recommended. The obtained results proved that the dynamic characteristics of tall slender structures under wind excitations can be effectively determined based on GPS measurements using RDM. © 2014 Elsevier Ltd.

Wzorek M.,Opole University of Technology
Fuel Processing Technology | Year: 2012

The paper presents the characteristics of the fuels which were prepared with the use of sewage sludge and other waste materials. Applicability of those fuels was analysed in the coal co-combustion processes, and in particular in the cement clinker manufacturing process. Three types of sludge-derived fuels were subjected to comparative analyses: the fuel which was prepared with the use of sewage sludge and coal slurry (PBS fuel), that involving sewage sludge and meat and bone meal (PBM fuel), and that in which sewage sludge was composed with sawdust (PBT fuel). Physical and chemical properties of those fuels were investigated, with special attention paid to their calorific values and physical properties. The results showed that the fuels manufactured with the use of waste materials offered the energy values which were satisfactory for the cement industry as specified for alternative fuels in that branch. The tests for physical properties revealed that such fuels may be subjected to mechanical handling operations in the transport and storage processes. © 2012 Elsevier B.V.

BiaLek M.,Opole University of Technology
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2010

A study was conducted to demonstrate that the occurrence of a chain termination reaction in ethylene polymerization was linked to the type of catalyst. It was demonstrated that zirconium bis(phenoxyimme) catalysts produced moderate to high molecular weight polyethylenes with equal numbers of vinyl and methyl groups as chain end structures. The verified the effects of the composition of the catalytic systems that contained salen-type complexes and investigated the effects of the type of the organoaluminium compound and the type of transition metals in the complex on the microstructure of obtained polyethylenes. Another analysis was performed for polyethylene, which was produced with the use of immobilized titanium and vanadium complexes. 1H NMR and FTIR spectrometric methods were ALSO used to analyze chain end structures in polyethylene synthesized with salen-type complexes of titanium, vanadium, and zirconium.

The paper presents an attempt to predict quality changes in a ten-component non-homogeneous granular system during mixing carried out on the mixing line in the following unit: a feed mixer, an intake hopper and a bucket conveyor. The mixing process was conducted with additional external recirculation of the components through the bucket conveyor. The attempt was made based on the knowledge on the course of quality changes in time for the mixture consisting of nine components, eleven components and twelve components. The modelling was conducted in two stages: in the first stage the quality of granular mixtures was determined with the use of the residual sum of squares, in the second stage variables were modelled by means of nonlinear regression. Dependent variable was a residual sum of squares, whereas independent variables were: number of components and mixing time. Twodimensional dependency was described by square function.

The issue of an effective assessment of the technical condition of the mechanical structure of the power transformer core and windings originated the research work discussed in this paper. This publication presents the results which indicate the possibility of developing a new and noninvasive diagnostic method of the transformer active part. The method developed is based on the time-frequency analysis results of the mechanical vibrations measured of the monitored appliance. The registration of vibrations is performed during switching the transformer monitored into idle operation. This paper characterizes the power object under study, the measuring system applied, and discusses a new methodology of assessment of the technical condition of the core and windings using a modified vibroacoustic method. The original measurement results presented in this paper were obtained during switching on a 200-kVA transformer in laboratory conditions. The analysis of the signals measured was carried out for four operating conditions of the transformer under study: 1) with the core pressed by the manufacturer; 2) with the core with loose screws fixing the upper yoke; 3) with the core with loose screws fixing the upper and lower yokes; and 4) with the core with loose screws fixing the upper and lower yokes with a simultaneous unpressing of the windings of the upper voltage side. © 2012 IEEE.

Loading Opole University of Technology collaborators
Loading Opole University of Technology collaborators