Temat: thickness reduction - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Examination of remaining zinc coating on old corrugated steel culverts under railway
Autorzy:: Hansing, L.
Cederqvist, S.
Powiązania:: https://bibliotekanauki.pl/articles/383930.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: remaining zinc coating
flexible structures
old corrugated steel culverts
life time of zinc coating
atmospheric corrosion
mass loss
thickness reduction
Opis:: In this paper the authors present measurements of the zinc coating thickness performed on old corrugated steel culverts under railway in Sweden. The measurements were performed in the summer of 2015. The object of the study is to have an indication on how hot dip galvanized corrugated steel culverts withstand real conditions. This information forms an important basis for the decision on possible life time expectancies for those structures.
Źródło:: Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 125-131
1897-4007
Pojawia się w:: Archiwum Instytutu Inżynierii Lądowej
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Dokładność sposobów określania miąższości dłużyc bez kory według normy PN-D-95000:2002 na przykładzie sosny zwyczajnej (Pinus sylvestris L.) z terenu Nadleśnictwa Płaska
Accuracy of methods to determine under bark volume of logs according to the PN-D-95000:2002 standard – a case study of Scots pine (Pinus sylvestris L.) from the Płaska Forest District
Autorzy:: Polkowski, K.
Zarzyński, P.
Tomusiak, R.
Powiązania:: https://bibliotekanauki.pl/articles/985738.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: lesnictwo
sosna zwyczajna
Pinus sylvestris
drewno sosnowe
dluzyce
miazszosc drewna
miazszosc dluzyc bez kory
pomiary
metody obliczen
polskie normy
norma PN-D-95000:2002
bark thickness
bark reduction
volume of large−sized wood
under−bark volume
Opis:: The State Forests, National Forest Holding operates on the principle of financial independence, and the sale of wood is the primary source of income of the institution. Raw wood is sold with the bark, although the registry applies to the wood without bark. It was hypothesized that the method of bark volume reduction may have a significant impact on the registered volume. The material collected in the Płaska Forest District was used to assess the impact of method of bark volume reduction presented in the PN−D−95000:2002 standard on the volume of Scots pine logs in thinned and harvest stands growing on fresh coniferous forest habitat. Analysis of the accuracy and precision of each method were carried out on the basis of sectional measurements of 180 logs (90 per stand type). Four methods were compared: table deduction depending on the diameter of the stem (method 1), measurement of bark thickness with manual bark gauge (method 2a), mechanical removal of the bark using a spokeshave at the place of measurement (method 2b), and calculation of the log volume with Huber formula and subsequent subtraction of the bark volume determined based on special ratio (method 3). All methods caused negative systematic error, and thus have a constant tendency to underestimate the volume of Scots pine logs. At the same time, the underestimated log volume varies depending on the method used. To the greatest extent it is lowered using method 1, as it differs significantly from the other methods. Slightly smaller errors are characterized by the method 2a, for which the average error rate also differs from the other methods. The smallest errors are provided by methods 2b and 3, between which we found no significant differences. Analyses indicate that the preferred method of determining the volume inside bark is a mechanical removing of bark, measuring the diameter without bark and calculation of the volume with Huber formula. It is also noteworthy to take into account the deduction percentage of bark in the logs of large−sized wood.
Źródło:: Sylwan; 2019, 163, 06; 460-468
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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