How to search?
advanced search

Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 5
items per page: 25 50 75
Sort by:

A concept of a method of remote determination of the air temperature along a sight line of surveying instruments

Kazimierz Ćmielewski
Geodesy and Cartography | 2002 | vol. 51 | No 3 | 133-139
Download PDF Download RIS Download Bibtex

Abstract

The author presents a concept of a method of remote determination of temperature along a sight line of surveying instruments. It has been assumed that the environment influences a laser beam propagated in space; as a result of this influence the laser beam is distorted and weakened. It has been decided to make advantage of such situation and to read information concerning the medium of light beam propagation from the change of the structure of the laser beam. The paper presents a laboratory method of readouts of atmospheric factors of the air from images of the face of the laser beam. Initial experiences have been promising and confirmed assumptions made by the author.
Go to article

Authors and Affiliations

Kazimierz Ćmielewski
ORCID: ORCID

Effect of Corrosion on Wear Resistance of the Composite Based on GX120Mn13 Cast Steel Zonally Reinforced with Particles (Al2O3+ZrO2)

Daniel Medyński
Archives of Foundry Engineering | 2023 | vol. 23 | No 3 | 133-139 | DOI: 10.24425/afe.2023.146675
Keywords abrasive wear cast steels ceramics composites corrosion
Download PDF Download RIS Download Bibtex

Abstract

The subject of the work are modern composite materials with increased wear resistance intended for elements of machines operating in difficult conditions in the construction and mining industries. The study determined the effect of zone reinforcement of GX120Mn13 cast steel with macroparticles (Al 2O 3+ZrO 2) on the corrosion resistance and abrasion wear of the composite thus obtained. SEM studies have shown that at interface between two phases, and more precisely on the surface of particles (Al 2O 3+ZrO 2) a durable diffusion layers are formed. During the corrosion tests, no significant differences were found between the obtained parameters defining the corrosion processes of GX120Mn13 cast steel and GX120Mn13 with particles (Al 2O 3+ZrO 2) composite. No intergranular corrosion was observed in the matrix of the composite material, nor traces of pitting corrosion at both phases interface. This is very important in terms of tested material’s service life. Reinforcement of cast steel with particles (Al 2O 3+ZrO 2) resulted in a very significant improvement in the abrasion resistance of the composite – by about 70%. After corrosion tests, both materials were subjected to further operational investigations. These examinations consisted in determining the impact of corrosion processes on the durability of the composite in terms of abrasion. The obtained results indicate that corrosion processes did not significantly deteriorate the wear resistance of both the cast steel and the composite.
Go to article

Bibliography

[1] Uetz, H. (1986). Abrasion and Erosion. Munich–Vienna: Carl Hanser Verlag Publ.
[2] Hebda, M., Wachal, A. (1980). Trybology. Warsaw: Scientific and Technical Publ (in Polish).
[3] Kalandyk, B., Zapała, R., Kasińska, J. & Madej, M. (2021). Evaluation of microstructure and tribological propertiesof GX120Mn13 and GX120MnCr18-2 cast steels. Archives of Foundry Engineering. 21(4), 67-76. DOI: 10.24425/afe.2021.138681.
[4] Marcus, P. (2017). Corrosion mechanisms in theory and practice. London–New York: CRC Press.
[5] Podrzucki, C. (1991). Cast iron. Structure, properties, application. vol. 2. Krakow: ZG STOP Publ (in Polish).
[6] Kaczmar, J., Janus, A., Samsonowicz, Z. (1998). Influence of technological parameters on the production of selected parts of machines reinforced with ceramic fibers. Report of Institute of Machine and Automation Technology, Wroclaw University of Science and Technology, Series SPR, 35 (in Polish). [7] Kurzawa, A., Kaczmar, J.W. & Janus, A. (2008). Selected mechanical properties of aluminum composite materials reinforced with SiC particles. Archives of Foundry Engineering. 8(2), 99-102.
[8] Kaczmar, J.W. & Kurzawa, A. (2012). The effect of α-alumina particles on the properties of EN AC-44200 Al alloy based composite materials. Journal of Achievements in Materials and Manufacturing Engineering. 55(1), 39-44.
[9] Jach, K., Pietrzak K., Wajler, A., Sidorowicz, A. & Brykała, U. (2013). Application of ceramic preforms to the manufacturing of ceramic – metal composites. Archives of Metallurgy and Materials, 58(4), 1425-1428. DOI: 10.2478/amm-2013-0188.
[10] Gawroński, J., Szajnar, J. & Wróbel, P. (2004). Study on theoretical bases of receiving composite alloy layers on surface of cast steel castings. Journal of Materials Processing Technology. 157, 679-682. DOI: 10.1016/j.jmatprotec.2004.07.153.
[11] Szajnar, J., Walasek, A., & Baron, C. (2013). Tribological and corrosive properties of the parts of machines with surface alloy layer. Archives of Metallurgy and Materials. 58(3), 931-936. DOI: 10.2478/amm-2013-0104.
[12] Hryniewicz, T., Rokosz, K. (2010). Theoretical basis and practical aspects of corrosion. Koszalin: Publ. House of Koszalin University of Technology (in Polish).
[13] Medyński, D. & Chęcmanowski, J. (2022). Corrosion resistance of L120G13 steel castings zone-Reinforced with Al2O3. Materials. 15(12), 4090, 1-14. https://doi.org/10.3390/ma15124090.
[14] Song, Y., Jiang, G., Chen, Y., Zhao, P. & Tian, Y. (2017). Effects of chloride ions on corrosion of ductile iron and carbon steel in soil environments. Scientific Reports. 7, 6865, 1-13. https://doi.org/10.1038/s41598-017-07245-1.

Go to article

Authors and Affiliations

Daniel Medyński
1
ORCID: ORCID
  1. Witelon Collegium State University, Poland

Obituarium: Jan Braun (1926–2015)

Olga Drewnowska
Rocznik Orientalistyczny/Yearbook of Oriental Studies | 2018 | vol. LXXI | No 1 | 133-139
Download PDF Download RIS Download Bibtex

Authors and Affiliations

Olga Drewnowska

Seasonal changes of carbohydrate content in Antarctic krill (Euphausia superba Dana)

Edward Kołakowski Lidia Szyper-Machowska
Polish Polar Research | 1989 | vol. 10 | No 2 | 133-139
Keywords Antarctic krill carbohydrate fractions seasonal variations
Download PDF Download RIS Download Bibtex

Abstract

Antarctic krill carbohydrate content was followed during 1983—84 Eighth Polish Antarctic Expedition. The Admiralty Bay (King George Island) was th area of study. The following average values of three estimated fractions were obtained: 3.77 +- 1.51%, 0.47 +- 0.34% and 3.30 +- 1.33% for total, TCA-soluble and TCA-insoluble carbohydrates, respectively. Percentage contribution of the estimated fractions to dry weight varied seasonally (1.48—7.41%, 0.15—1.83%, and 1.28—6.28%, respectively). The carbohydrate content showed a clearcut cycle of changes over the calender year, with a minimum in autumn-winter and a maximum in spring-summer.

Go to article

Authors and Affiliations

Edward Kołakowski
Lidia Szyper-Machowska

On the oribatid and mesostigmatid mites (Acari) of the High Arctic island of Hopen

Stephen J. Coulson Heinrich Schatz Dariusz J. Gwiazdowicz Torstein Solhøy
Polish Polar Research | 2014 | No 1 | 133-139 | DOI: 10.2478/popore−2014−0002
Keywords Arctic Svalbard Hopen Acarina diversity dispersal
Download PDF Download RIS Download Bibtex

Abstract

The archipelago of Svalbard in the European High Arctic lies on the convergence of the Palaearctic and Nearctic flora and fauna and contains elements of both regions. The island of Hopen is located in the south east of the archipelago within the path of the cold south−westerly flowing East Svalbard Current originating in the Arctic ocean and flowing along the north Russian coast. This current is postulated as a colonization route of the invertebrate fauna of Svalbard. Few reports of the terrestrial invertebrates of Hopen exist and none of the mite suborders Oribatida or Mesostigmata. With the taxonomic confusion existing in the inventories of this important region of the Arctic, new sampling campaigns with species identified by modern taxonomic principles and with material deposited in accessible museums and collections are essential. Identified mites included six species of oribatid mites with Diapterobates notatus dominating, and five species of Mesostigmata with Zercon forsslundi forming the dominant species. None of the species collected was a new record for Svalbard and all have wide circumpolar, Palaearctic or Holarctic distributions. Dispersal to Svalbard from northern Russia is hence neither supported nor rejected. The expected oribatid and mesostigmatid diversity of the island is greater than observed from the limited sampling described here.
Go to article

Authors and Affiliations

Stephen J. Coulson
Heinrich Schatz
Dariusz J. Gwiazdowicz
Torstein Solhøy

This page uses 'cookies'. Learn more