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Lublin, Poland

Lublin University of Technology is an engineering university in Lublin, Poland. It was established on May 13, 1953 and currently has 11,000 students. Wikipedia.

Rudawska A.,Lublin University of Technology
International Journal of Adhesion and Adhesives | Year: 2014

The study presents selected problems of the effect of mechanical treatment on surface roughness and adhesive properties as well as adhesive joint strength of steel sheets. In the experiments, the following treatments were applied: grinding, lapping and superfinishing, with variations of some technological machining parameters being taken into account. Based on the conducted experiments, it has been found that the technological parameters of mechanical treatment affect the surface roughness, adhesive properties and adhesive joint strength, depending on the treatment method and parameters applied. It has also been found that the mechanical surface pretreatments have positively affected the adhesive joint strength. The specimens subjected only to degreasing exhibit lower strength. © 2014 Elsevier Ltd. Source

Koltunowicz T.N.,Lublin University of Technology
Acta Physica Polonica A | Year: 2014

In this paper it was established that nanocomposite (FeCoZr)x(PZT)100-x, with x = 90.0 at.%, produced by ion sputtering with argon and oxygen beam remains under the percolation threshold. It is related to the compound structure of films and creation of coat consisting of metallic oxides on surface of metallic phase nanogranules, which prevents electric contact between nanoparticles. Verification of the Arrhenius dependences for capacity and conductivity demonstrates that dominant part of metallic phase nanogranules has metal oxide coatings. Only a small number of nanogranules (probably around a few percent) does not have oxide coating. Source

Sangwal K.,Lublin University of Technology
Journal of Informetrics | Year: 2013

The distributions of citations L, two- (IF2) and five-year impact factors (IF5), and citation half-lives λ of journals published in different selected countries are analyzed using Langmuir-type relation: yn=y0 {1-αKn/(1+Kn)}, where yn denotes Ln, IF2n or IF5n of n-ranked journal, y0 is the value of yn when journal rank n=0, α is an empirical effectiveness parameter, and K is the Langmuir constant. It was found that: (1) the general features of the distribution of Ln, IF2n or IF5n of the journals published in different individual countries are similar to the results obtained before by the author from the analysis of the citation distribution data of papers of individual authors (K. Sangwal, Journal of Informetrics 7 (2013) 36-49), (2) in contrast to the theoretically expected value of the effectiveness parameter α=1, the calculated values of α>1 for journals published in different countries, (3) the trends of the distribution of cited half-lives λn of journals differ from those of Ln, IF2n and IF5n data for different countries, and show one, two or three linear regions, the longest linear regions with low slopes are observed in the case of countries publishing relatively high number of journals, and (4) the product of the Langmuir constant K and the number N of journals for the processes of citations and two- and five-year impact factors of journals published in different countries is constant for a process. The results suggest that: (1) the values of α>1 are associated with a process that retards the generation of items (i.e. citations or impact factors), the difference (α-1) being related to the dissemination of contents of the journals published by a country, and (2) the constancy of KN is related to the publication potential of a country. © 2013 Elsevier Ltd. Source

Sangwal K.,Lublin University of Technology
Journal of Informetrics | Year: 2013

The citation distribution of papers of selected individual authors was analyzed using five mathematical functions: power-law, stretched exponential, logarithmic, binomial and Langmuir-type. The former two functions have previously been proposed in the literature whereas the remaining three are novel and are derived following the concepts of growth kinetics of crystals in the presence of additives which act as inhibitors of growth. Analysis of the data of citation distribution of papers of the authors revealed that the value of the goodness-of-the-fit parameter R2 was the highest for the empirical binomial relation, it was high and comparable for stretched exponential and Langmuir-type functions, relatively low for power law but it was the lowest for the logarithmic function. In the Langmuir-type function a parameter K, defined as Langmuir constant, characterizing the citation behavior of the authors has been identified. Based on the Langmuir-type function an expression for cumulative citations L relating the extrapolated value of citations l0 corresponding to rank n=0 for an author and his/her constant K and the number N of paper receiving citation l≥1 is also proposed. © 2012 Elsevier Ltd. Source

Samolyk G.,Lublin University of Technology
Journal of Materials Processing Technology | Year: 2013

Orbital forging is a metal forming process in which one of the dies performs a complex rocking motion. It ensures reduction in required load and allows for the cold forming of a workpiece. One of the mechanical parts formed by means of this technology is a bevel gear. However, a numerical analysis of orbital forging bevel gears is very difficult to perform due to the complex rocking motion of the die, which is confirmed by numerous works investigating the orbital forging process. In the present work, investigation results of the cold orbital forging of aluminum alloy bevel gears are presented. In contrast to other works devoted to the process, this study proposes a new procedure for forming bevel gears and the workpiece used has a shape which is different from the previously applied ones. The obtained results apply to both theoretical and technological aspects of orbital forging. The FEM simulation results have been successfully verified in laboratory conditions using the industrial PXW-100A press. © 2013 Elsevier B.V. Source

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