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EN
The article presents the research results of the performance of wireless multi-hop networks. The analysis of the decrease in performance of such networks depending on the number of hops was performed for three popular transmission techniques used in mesh networks: Hybrid Wireless Mesh Protocol (default routing protocol for 802.11s), Optimized Link State Routing Protocol and Wireless Distribution System. Based on the measurements results, mathematical models for the decreasing of network transmission parameters depending on the number of hops were developed.
PL
W artykule przedstawiono wyniki pomiarów wydajności sieci bezprzewodowych dla topologii wieloskokowych zbudowanych w oparciu o technikę WDS oraz standard 802.11s. Zaprezentowane wyniki degradacji przepustowości i opóźnienia w sieci porównano dodatkowo z wynikami wcześniejszych badań dla protokołu OLSR.
EN
The article presents the results of measurements of wireless network performance for multi-hop topology based on the WDS technique and the 802.11s standard. The presented results of bandwidth and jitter degradation have been additionally compared with the previous results performed for the OLSR protocol.
EN
Since its discovery, the Morasko meteorite has been the subject of many studies. Among the publications summarising the mineralogical and geochemical characteristics of the Morasko meteorite, two monographs are worth mentioning by: Dominik (1976) and Muszyński et al. (2012), in which the essentialfeatures of the Morasko meteorite were presented. Since the first piece of the Morasko meteorite was to be explored, the analysis of mineral composition has been conducted with more and more specialised and sophisticated instrumental methods. As it is well known, the Morasko meteorite is classified into the group of iron meteorites IAB MG, and consists mainly of the crystalline Fe-Ni alloy in the form of two minerals: kamacite and taenite, accompanied by tetrataenite. A commonly found structure of the mineral composition of the Morasko meteorite, as regards other iron meteorites, are graphite-troilite nodules, which contain silicate and phosphate minerals. This paper presents a review ofresearch on the mineralogy and geochemistry of the Morasko meteorite, where a number of instrumental tests have been used, from microscopic observations to microchemical semiquantitative analyses using scanning electron microscopy (SEM-EDS), microchemical quantitative analyses using an electron microprobe (WDS), to the structural methods applying Raman spectroscopy. The results of microscopic, microchemical and microstructural investigations, which have included the outer layer of the meteorite known as a fusion crust, have been presented against the petrographic composition of the meteorite. Besides, the type of sediment attached to the outer meteorite layer was examined. The research, conducted on two dozen meteorite fragments, allowed distinguishing two different zones concerning mineralogy and geochemistry, and to determine microstructural changes within them, most probably created in the processes related to the moment of the meteorite impact.
PL
W artykule przedstawiono podstawowe zalety i problemy wynikające ze stosowania analizatorów EDS do identyfikacji pierwiastków w materiale badanych próbek. Omówiono różnice pomiędzy analizatorami EDS i WDS ze względu na zasadę działania i rozdzielczość. Przedstawiono przykład zastosowania analizatora EDS do mikroanalizy chemicznej materiału łopatki turbiny silnika lotniczego po eksploatacji.
EN
The most essential merits and drawbacks resulting from applying the EDS detectors to identity elements in the materiaIs of specimens under examination have been presented. Differences between the EDS and WDS detectors due to both the principle of operation and resolution have been discussed. An instance of applying the EDS detector to microchemical analysis of the material of an aircraft turbine blade withdrawn from service has been discussed.
PL
Technika analityczna, wykorzystująca emisję promieniowania rentgenowskiego wzbudzanego przez intensywny, zogniskowany na małej powierzchni strumień elektronów o dużej energii, nazywana jest często mikrosondą elektronową.
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