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1

Ultraschalluntersuchung der Qualitat von Rundholz

100%
Bajkowski B., Cyrankowski M., Osipiuk J.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 81
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Technical simulation of knots in structural wood

86%
Burawska I., Zbiec M., Kalicinski J., Beer P.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 82
3

Features of parallel to graine deformation in pine structural roundwood under rate increasing loading

86%
Byiskih N.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 81
4

Knottiness as a factor differentiating characteristic quality zones on spruce stems in thinned stands

86%
Barszcz A.
Forestry
|
1999
|
tom 02
5
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Size and localisation of knots in timber from mountain spruce stands in the Dolomites

72%
Barszcz A., Sandak A., Sandak J.
Folia Forestalia Polonica. Series A . Forestry
|
2010
|
tom 52
|
nr 1
The aim of the study was evaluation of knots in wood of 150-year-old Norway spruce [Picea abies (L.) Karst.] in stands situated at the altitude of 1450– 1740 m above sea level in the Dolomites in Italian section of the Alps. In selected stands, spruce trees were cut down and their length, stem thickness, height to the crown base and stem diameters at every 1 m along the length of merchantable bole were measured. The diameter of knots was measured and they were classified according to their healthiness and the degree of their tightness with the surrounding wood. The relative knot diameters were calculated and the relative height of their location on stem was determined. In total on sample trees there were analysed 1070 knots, of which sound knots (close to 75%) and tight (more than 60%) prevailed. Sound and tight knots had largest diameters, relative diameters and relative heights of location on merchantable boles. The smallest diameters and relative diameters were indicated by rotten and not tight knots that were located at the lowest merchantable bole parts.
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Comparison of different failure approaches in knotty wood

72%
Guindos P.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2014
|
tom 57
|
nr 193
This article presents and assesses 64 different ways for predicting the failure onset in knotty wooden beams. The aim is to provide engineers and modellers a generalview of how to evaluate the failure in wooden structural members with knots.The studied criteria included both the conventional point-based and average stress theories. Special attention was paid to the effect of the elements of the woodmesostructure, i.e. knots and fiber deviation, which can generate singular stress concentrations as notches or cracks would do in fracture mechanics. The case study consisted of predicting the failure onset of bending in structural wooden beams.A previously validated finite element model was used in order to compute the heterogeneous stresses. It was found that the knots caused considerable stress singularities so that the size of the average stress theory influenced the failure predictions by up to 23%. However, the variations generated by distinct phenomenologicalcriteria were in general much smaller. The application of the average stress theory in large stress integration volumes is strongly recommended when predicting the failure in wood members.
7

The response of thick-branched pine trees to pruning

72%
Giefing D. F., Jonasz K., Wesoly W.
Electronic Journal of Polish Agricultural Universities. Series: Forestry
|
2004
|
tom 07
|
nr 2
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Local reinforcement of naturally defected structural lumber

72%
Burawska I., Jachowicz P., Zbiec M., Grzeskiewicz M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2014
|
tom 87
9
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Effect of sawn zone on the quality of lumber in the evaluation of selected pine wood defects

72%
Wieruszewski M., Mirski R., Trocinski A., Kawalerczyk J.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2021
|
tom 114
10

Biological reactions of thick-branched Scots pines (Pinus sylvestris L.) to pruning in relation to the season of the year of the operation

58%
Giefing D. F., Zlota M., Stypik P., Wykpisz P.
Electronic Journal of Polish Agricultural Universities. Series: Forestry
|
2006
|
tom 09
|
nr 4
11
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Influence of knots on the content of chemical substances in knot adjacent oak wood (Quercus petraea Liebl.)

58%
Krutul D., Zielenkiewicz T., Zawadzki J., Radomski A., Antczak A., Drozdzek M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 83
12
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The possibility to use a side-timber in glulam beams manufacturing for structural applications

58%
Kawalerczyk J., Kulinski M., Dziurka D., Mirski R.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2021
|
tom 113
13
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Investigation of round Scots pine wood WC01 class using X-ray computer tomography

58%
Zaton P., Kozakiewicz P., Mankowski P.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2022
|
tom 117
14

Wysokość położenia sęków oraz lokalizacja i wielkość martwic u świerka pospolitego [Picea abies (L.) Karst.] pochodzącego z głównych ośrodków i zasięgów jego występowania w Polsce

51%
Michalec K.
Acta Agraria et Silvestria. Series Silvestris
|
2011
|
tom 49
The research presented below analyses the differences in the location of knots and injuries as well as the size of injuries on the stems of Norway spruce from different regions of Poland. The research was conducted on 32 plots located within two ranges of the occurrence of spruce in Poland: the north-eastern range and the south-western one. On the selected spruce trees, the researchers measured the height of location of knots and injuries as well as injury sizes. The analyses revealed significant differences in: the height of location of knots and overgrown injuries and the size of injuries in trees from different regions and ranges of occurrence while no such differences were found in the height of location of open injuries.
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