Zobrazeno 1 - 10
of 1 751
pro vyhledávání: '"J. Kowalczyk"'
Publikováno v:
Metalurgija, Vol 63, Iss 1, Pp 53-56 (2024)
The paper presents the results of tribological tests of the Ti13Nb13Zr titanium alloy - carried out in the conditions of lubrication with liquids simulating body fluids. Artificial saliva solutions were used for the tests. Two pH values were used –
Externí odkaz:
https://doaj.org/article/32fc096dba3c4c4f9db90c53a58f796c
Publikováno v:
Metalurgija, Vol 63, Iss 1, Pp 57-60 (2024)
The HS6-5-2C steel samples with different surface roughness were used for the tests. After grinding had a roughness parameter of Ra = 0,03 μm, and after polishing Ra = 0,01 μm. A TiAlN coating was applied to the substrate prepared in this way. Usin
Externí odkaz:
https://doaj.org/article/bca42754432a41db900376d35356d136
Publikováno v:
Metalurgija, Vol 63, Iss 1, Pp 85-88 (2024)
This paper presents the tribological properties of diamond-like-carbon coatings (DLC) doped with tungsten. The hardness of the DLC coating was determined using a micro-hardness tester. Friction tests were carried out on a tribometer in rotational mot
Externí odkaz:
https://doaj.org/article/714a8dfeccd448cbaa610da3b975cd18
Autor:
J. Kowalczyk, M. Madej
Publikováno v:
Metalurgija, Vol 61, Iss 3-4, Pp 661-664 (2022)
In this paper, titanium coatings were deposited on steel using the plasma-assisted chemical vapor deposition (PACVD) process. These coatings were deposited at the same gas flow and power parameters, but at different times. This resulted in the creati
Externí odkaz:
https://doaj.org/article/11f6b67fd5884d159b782e49c3422862
Autor:
D. Brugger, B. Wagner, W.M. Windisch, H. Schenkel, K. Schulz, K.-H. Südekum, A. Berk, R. Pieper, J. Kowalczyk, M. Spolders
Publikováno v:
Animal, Vol 16, Iss 8, Pp 100598- (2022)
Currently, the authorisation procedure of trace elements as feed additives in the European Union according to Regulation (EC) No. 1831/2003 does not consider the bioavailability of trace element sources. This manuscript provides framework conditions
Externí odkaz:
https://doaj.org/article/9bc40b39a9f94da1912ad48665a3ce2c
Autor:
F. Koch, J. Kowalczyk, B. Wagner, F. Klevenhusen, H. Schenkel, M. Lahrssen-Wiederholt, R. Pieper
Publikováno v:
Animal, Vol 15, Iss 9, Pp 100319- (2021)
Bedding, environmental enrichment materials and disinfectant powders in pig farming are meant to ensure a hygienic bedding environment or allow pigs to perform explorative behaviour. To our knowledge, no legal regulation exists, that established maxi
Externí odkaz:
https://doaj.org/article/ddbf11e1b4374e5082f1e27be9ade5a6
Publikováno v:
Czech Journal of Animal Science, Vol 58, Iss 7, Pp 328-341 (2013)
The influence of selenite (SeIV) or selenate (SeVI) added to ovine ruminal fluid containing linseed oil (LO) on the profile of fatty acids (FA), particularly conjugated linoleic acid (CLA) isomers, was investigated. The ruminal fluid was incubated in
Externí odkaz:
https://doaj.org/article/c1939ab1aa2b4f2fb04572243eae82e6
Publikováno v:
Czech Journal of Animal Science, Vol 57, Iss 9, Pp 389-401 (2012)
The aim of the study was to determine the influence of the addition of 5% linseed oil (LO) and 2 µg Se as selenate (SeVI) per g of diet on body mass gain (BMG), feed conversion efficiency (FCE), and concentrations of fatty acids (FA), especially con
Externí odkaz:
https://doaj.org/article/922383aba776401b83571f3ed11d33c5
Autor:
M. Czauderna, J. Kowalczyk
Publikováno v:
Czech Journal of Animal Science, Vol 57, Iss 1, Pp 19-27 (2012)
Ultra-fast liquid chromatography with a photodiode array detector for simple and rapid determination of urea in body fluids of farm animals is described. Blood plasma, milk, and urine samples are treated with trichloroacetic acid and then centrifuged
Externí odkaz:
https://doaj.org/article/8745ec3ad2cb41f8aff6aa7e2c5270ed
Publikováno v:
Czech Journal of Animal Science, Vol 56, Iss 2, Pp 81-94 (2011)
The purpose of the present study was to determine the influence of diets containing conjugated linoleic acid isomers (CLAmix) with or without low (LSe) or high (HSe) concentration of selenised yeast (SeY) on body weight gain (BWG), feed conversion ef
Externí odkaz:
https://doaj.org/article/f84ce9456562414f8e6ce67ec24f3f44