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Mariusz Walczak, Jacek Caban and Andrzej Marczuk

Abstract

The continuous technological development requires the use of modern materials also in agricultural engineering. Knowledge of the characteristics of tribological materials pairs cooperating with each other is useful for developing sliding nodes of agricultural machinery. Tribological properties of materials should be assessed for selection of technological materials beyond the economic criterion. The article presents analysis of the characteristics of tribological ball-on-disc wear of polymeric materials used as sliding elements for farm machines. Tribological tests were carried out under dry friction for a polymer-metal pair, and a wear rate and friction coefficient of the sample; the signs of wear were submitted to SEM observations.

Open access

Nikolaj Perepravo, Vladimir Zolotarev, Aleksej Ševcov, Jurij Ahlamov, Sergej Otroško, Nikolaj Šarikov, Vladimir Kosolapov, Andrzej Marczuk and Jacek Caban

Abstract

In case of traditional harvesting methods the losses of perennial grass seeds may reach 45-50% of the biological yield in unfavourable weather conditions. The paper presents the results of comparative assessment efficiency of various methods of harvesting of perennial seed grass. It was found that the use of special devices and structures in combine harvesters allows increase of yield of technological mixture to the combine tank, degree of seed threshing to 93% and limit the losses of crop to 20-29%. Harvesting of seeds in non-waste technology with harvesting of the entire yield with later transport, drying, threshing and seeds cleaning in stationary devices results in reduction of losses by 5 to 10% but it leads to the increase of energy inputs by 24-25% in comparison to traditional with threshing method. Harvesting with a combing method of plant seeds on a trunk in „Невейки” technology results in the increase of the seeds harvesting to 86-98% of a biological yield.

Open access

Jacek Caban, Eva Brumercikova, Bibiana Bukova, Frantisek Brumercik, Ján Vrábel, Branislav Šarkan and Piotr Ignaciuk

Abstract

The maritime transport is particularly exposed to danger due to the environment of its operations. These are the threat dependent and independent of human e.g. environmental, safety health and life of humans or belongings. In spite of attempts to limit the risk of danger, it is impossible to completely eliminate it. The article presents some aspects of the state of transportation safety in the Baltic Sea from Statistical Yearbook of Maritime Economy and Helcom as well as attempt the undertaken to analyses the security state of this sea area in 2009 to 2015.

Open access

Robert Król, Krystyna Jaworska, Henryk Karkoszka, Jerzy Chudek, Jacek Ziaja, Joanna Badura, Jacek Pawlicki, Grzegorz Oczkowicz, Artur Caban, Wojciech Marcinkowski, Sylwia Sekta, Jarosław Wilk, Andrzej Gabriel, Zbigniew Gonciarz, Anna Kunsdorf-Wnuk, Franciszek Kokot, Andrzej Więcek and Lech Cierpka

Introduction of Liver Transplant Programme in Upper Silesia

Liver transplantation is the only method of treatment of patients with end stage liver insufficiency. Inadequate number of transplantations in Poland in relation to demands causes a need of new liver transplantation centres formation.

The aim of the study was to present process of introduction of liver transplantation programme and results of the first 12 transplantations.

Material and methods. Preparations to transplantation were based on training of surgical, anaesthetics and nephrological teams in transplant centres in Paris, Birmingham and Warsaw. Own protocols of organ harvesting, recipients' qualification, transplantation and postoperative treatment were worked out; they were a result of experience acquired in teaching centres. From October 16, 2005 to October 2006, 12 liver transplantations were performed in patients with end stage liver insufficiency of different origin. Patients' age varied from 21 to 67 years. The stage of liver failure according to Child-Pough was 8.6±2.8, and MELD 18.6±7.2. All elective operations were performed using Piggyback technique. Immunosuppression regimen was uniform and consisted of tacrolimus and prednisolone.

Results. One patient died due to post reperfusion syndrome with no respond to catecholamine treatment. In 1 patient developed primary lack of the liver graft function that required re-transplantation, which was successfully performed on 2nd postoperative day. Among 10 patients who were discharged from the hospital on mean 31 postoperative day all are alive, and 7 of them returned to full live activity.

Conclusion. Training in famous liver transplant centres and own experience in kidney and pancreas transplantation allowed for successful introduction of liver transplantation programme.