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The object of the study was a thin-walled profile with Z-shaped cross section made of the carbon-epoxy composite. The material model was prepared based on the implemented orthotropic properties. The purpose of the study was to determine the value of the critical load at which buckling occurs, the form of buckling and operating characteristics in critical condition. In order to achieve this numerical...
Cavitation is a common phenomenon in pump systems, negatively influencing their operating parameters and components such as impellers and, thus, causing considerable financial losses. This paper explains the problem of cavitation and cavitation erosion. The causes of cavitation in pump systems are analyzed. A selection of centrifugal pump impellers damaged by cavitation erosion are presented and examined...
Autobusy z napędem elektrycznym, choć obecnie mają niewielki udział w rynku, coraz szybciej zdobywają popularność. W artykule omówiono najpopularniejsze technologie służące do wytwarzania baterii trakcyjnych. Szczególną uwagę poświęcono firmie Impact Clean Power Technology S.A., która opracowała modułowy system bateryjny dla transportu publicznego oparty o technologię LFP, NMC lub LTO.
W pracy podjęto problem identyfikacji przyczyny uszkodzenia zawiasu pokrywy matrycy laptopa. Biorąc pod uwagę mechaniczne i materiałowe przyczyny wystąpienia awarii podjęto badania mające na celu określenie czy do uszkodzenia doszło z przyczyn powstałych w procesie produkcji czy niewłaściwego użytkowania. Przeprowadzono badania fraktograficzne umożliwiają identyfikację mechanizmów utraty spójności...
On 8 July, 2012, a single male of Nehalennia speciosa has been found within the borders of Kampinos National Park in Poland, the Masovian voivodeship (52°19’10” N, 20°45’18” E, UTM: DC89). The individual was found in a habitat uncharacteristic for the species. The vegetation of the observation site consisted of young Scots Pines and Heather, growing on poor soils of sand dunes, with no water bodies,...
W pracy przedstawiono zmiany jakości wody rzeki San (od km 28+800 do 23+200) w wyniku zrzutu oczyszczonych ścieków komunalnych i przemysłowych w km 26+440. Na badanym odcinku San objęty jest ochroną w ramach obszarów siedliskowych Natura 2000 (Dolina Dolnego Sanu). Badania zanieczyszczeń w oczyszczonych ściekach z Miejskiej i Centralnej Oczyszczalni prowadzono dwa razy w miesiącu. Miejska Oczyszczalnia...
One of priority tasks of the Slovak Republic to boost the use of domestic energy potential and thus to decrease Slovakia's dependence on imported fossil fuels is to increase utilisation of renewable energy sources in heat and electricity generation. Heat pumps offer the most energy-efficient way to provide heating and cooling in many applications, as they can use renewable heat sources in our surroundings.
The human cloning is a controversial ethical subject. The polish comprehensive school pupils (210 girls and 107 boys) anonymously poll on causes of "human cloning". The "cloning" for 60% people means creating the copy of alive organism, however for 1% the method of artificial insemination. The majority of pupils (74,7%) don't accept the human cloning (74,7%). About 40% of pupils...
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