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Tytuł:
Wpływ 25-procentowego wodnego roztworu amoniaku na skurcz i pęcznienie drewna buka, dębu i sisny
Vlijanie 25% vodnogo rastvora amminaka na usushku i nabukhanie drevesiny buka, duba i sosny
The effect of 25% aqueous solution of ammonia upon the shrinkage and swelling of beech, oak and pine wood
Autorzy:
Onisko, W.
Matejak, M.
Powiązania:
https://bibliotekanauki.pl/articles/822935.pdf
Data publikacji:
1971
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewnictwo
drewno bukowe
drewno debowe
drewno sosnowe
skurcz drewna
pecznienie drewna
roztwor amoniaku
roztwory wodne
Źródło:
Sylwan; 1971, 115, 02
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selected factors on the strenght of wood adhesive joints
Autorzy:
Rudawska, Anna
Maziarz, Marek
Šajgalík, Michał
Valášek, Petr
Zlamal, Tomas
Iasnii, Volodymyr
Powiązania:
https://bibliotekanauki.pl/articles/102152.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
adhesive joint
strength
pine wood
oak wood
połączenie klejowe
siła
drewno sosnowe
drewno dębowe
Opis:
This paper examines the effect of selected factors on the wood bonded joint strength. The structural factor under scrutiny was the geometry of the surface area; however, other major dimensions of adherends were compared as well. The tests were performed on 6 joint types: butt, v-shaped, interlocking, scarf, tongue & groove, and single lap joints, which were formed on two types of substrate materials – pine and oak wood, and adhesively bonded. The joints were bonded with Prefere 6312 wood adhesive and Loctite 3430 two-component epoxy adhesive. Strength testing of the joints was performed on Zwick/Roell Z150 material testing machine, according to DIN EN 1465 standard. The results obtained from the tests indicate that bonded joints of oak wood exhibit higher strength properties than those of pine wood adherends, which was confirmed in nearly all strength tests.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 3; 47-54
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proces oczyszczania sie pni debu szypulkowego [Quercus robur L.] a piersnica drzew w drzewostanach gospodarczych
Self-pruning of pedunculate oak [Quercus robur L.] stems and the diameter at breast height of trees in commercially managed stands
Autorzy:
Szymanski, M.
Pazdrowski, W.
Kazmierczak, K.
Nawrot, M.
Werner, M.
Manka, K.
Powiązania:
https://bibliotekanauki.pl/articles/46183.pdf
Data publikacji:
2010
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
lasy gospodarcze
drzewa lesne
dab szypulkowy
Quercus robur
cechy biometryczne
piersnice drzew
samooczyszczanie
ugalezienie
drewno debowe
jakosc
Źródło:
Leśne Prace Badawcze; 2010, 71, 1; 61-73
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zasięg oddziaływania iniekcji hydrostatycznych w drewnie dębu szypułkowego (Quercus robur L.)
Autorzy:
Zarzyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1022214.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drewno debowe
iniekcja hydrostatyczna
Quercus robur
lesnictwo
dab szypulkowy
zasieg dzialania
drzewa lesne
hydrostatic injections
sessile oak wood
effect range
Opis:
Hydrostatic injections are the method of applying chemicals directly into the wood of living trees. Laboratory tests proved their usefulness. However, still an open question remained the range of penetration of the liquid fed into the tree this way. To answer this question, a series of experiments were performed, using water with an addition of methylene blue – a dye leaving durable effects in the wood – as the working liquid. This paper depicts the results of this experiment.
Źródło:
Sylwan; 2005, 149, 04; 15-20
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Klasyfikacja surowca wybranych gatunków według norm polskich i Unii Europejskiej
Classification of wood of selected tree species according to the Polish and the EU standards
Autorzy:
Michalec, K.
Wąsik, K.
Barszcz, A.
Groń, A.
Powiązania:
https://bibliotekanauki.pl/articles/989278.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
surowce drzewne
drewno bukowe
drewno debowe
drewno jodlowe
drewno swierkowe
wady drewna
jakosc drewna
klasyfikacja drewna
normy unijne
normy polskie
raw wood
wood defects
wood value
softwood
hardwood
Opis:
The aim of this paper was to perform a comparative analysis of the quality and the value of beech, oak, fir and spruce wood classified according to the Polish and the EU standards. The research was carried out in Lesko and Baligród forest districts (south−eastern Poland). The measurements of the investigated raw wood were taken at the upper landings. With regard to fir, spruce and beech 50 specimens per species were measured, while in the case of oak only 25 pieces were examined. Each specimen was classified in respect of its quality and size according to the Polish standards (PN) and the European Union (PN−EN) standards. Then, the results of both classifications were compared in terms of the share of volumes of particular wood quality classes, the impact of wood defects on the raw wood classification results, and the value of wood determined by the means of both standards. With regard to the beech wood, the share of the poorest class D upon applying PN−EN was smaller than that for PN norms. This decrease was in favour of other classes, due to which the value of the entire beech wood increased by ca. 16%, when classified with the use of the EU standards. The oak wood revealed a slight increase in the share of wood volume in the class C and a decrease in the class D of PN−EN when compared with the Polish norms. The value of the oak wood classified with the use of the EU standards was merely by 2.3% higher than that of the Polish norms. With regard to the softwood (fir and spruce), a decrease in the share of wood of the class C in PN−EN was recorded, which was in favour of the classes B and D. The value of raw wood classified by means of the EU standards was lower for both of the coniferous species. The decrease for fir accounted for 13.3%, while for spruce it was only 1.5%. For the evaluation of the softwood, Polish classification was more profitable, whereas for hardwood the EU standards were more favourable.
Źródło:
Sylwan; 2016, 160, 06; 459-465
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obecność martwic na pniach drzew stojących a jakość i wartość surowca dębowego
Necroses occurring on trunks of standing trees against the quality and the value of oak timber
Autorzy:
Michalec, K.
Wąsik, R.
Gruchała, K.
Powiązania:
https://bibliotekanauki.pl/articles/989907.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
dab
drzewa stojace
uszkodzenia mechaniczne
martwice drewna
drewno debowe
jakosc
timber damage
defects
mechanical injuries
timber classification
rot
Opis:
This paper aimed to evaluate the impact of necroses occurring on trunks of standing oak trees on their wood quality and value. The research was carried out in five study plots situated in the Meszcze Forestry, Piotrków Forest District (central Poland). The investigations covered: measuring the diameter at breast height of every injured tree with diameter ≥7 cm, estimating the length of the trunk fragment that should be cut off to remove the defect, the assessment of the quality and size of the 3−m butt−end fragment of a trunk, excluding the detected damage or rot (classification I), as well as the quality and size assessment of the same trunk fragment, though including the encountered defect (classification II). The theoretical volume of timber within the particular quality classes was computed (WAt, WBt, WCt and WDt). Afterwards, the real volumes (WAr, WBr, WCr and WDr) were compared with those of groups S2r and S4r. Based on the analysis of the quantity of damaged trees in the investigated trial plots, the lowest share of such specimens was recorded in the compartment 2a (1.6% of defective trees). Whereas, the highest share of damaged trees was encountered in the compartment 39a (8.5%). The timber of more valuable large−sized classes 'migrated', due to damages, to the groups of medium−sized timber (S2 or S4). With respect to the total volume of timber within the particular classes and groups, the greatest loss was reported in the WB class. The timber in question 'migrated' mostly to the group S2, though a part of it was classified to the group S4 as well. The established decrease in the timber value, due to damages to trunks, accounted for ca. 26%, which amounted to ca. 5.8 thous. PLN, in relation to the entire investigated material. The obtained results indicated the necessity to reduce the damages occurring in oak stands and remove the injured trees as soon as possible to avoid a significant depreciation and a value loss of raw wood.
Źródło:
Sylwan; 2015, 159, 09; 740-746
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyniki submisji drewna cennego na przykładzie RDLP Krosno
Submission sale of valuable wood on the example of the Krosno Regional Directorate of the State Forests
Autorzy:
Zastocki, D.
Dobosz, L.
Moskalik, T.
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/972767.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drewno
sprzedaz
submisje
RDLP Krosno
ceny
rynek drzewny
analiza cen
drewno cenne
drewno bukowe
drewno brzozowe
drewno czeresniowe
drewno debowe
drewno jesionowe
drewno jaworowe
drewno klonowe
drewno lipowe
drewno modrzewiowe
drewno olszowe
drewno orzecha
drewno osiki
drewno sosnowe
drewno wiazowe
submission
assortment
valuable wood
timber market
Polska
Opis:
Sale of valuable wood assortments in the State Forests takes place in submissions and other forms of timber sale. In response to the growing demand for a specific timber, the forest administration of the Krosno Regional Directorate of the State Forests (RDSF) offers customers the ever−increasing amount of high−quality wood for sale in the submission. This has resulted in an increased interest in purchases of large amounts of wood in one place to be processed by veneer wood companies, and at the same time contributed to the promotion of the Podkarpacie region.The paper presents sale results and prices of veneer wood obtained in submissions and in other forms of sale in the territory of the Krosno RDSF in the years 2000−2009. A detailed analysis of the value of sales of valuable wood in submissions and in other forms of sale in individual years allowed to draw conclusions confirming the correctness of the decisions made in choosing such forms of timber sale.
Źródło:
Sylwan; 2012, 156, 07; 483-493
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zależność między żywotnością polskich proweniencji buka (Fagus sylvatica L.) i dębów (Quercus robur L., Q. petraea (Matt.) Liebl.) a odczynem ich drewna
Autorzy:
Piętka, J.
Szczepkowski, A.
Tarasiuk, S.
Powiązania:
https://bibliotekanauki.pl/articles/1022163.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
hodowla lasu
Quercus petraea
Quercus robur
lesnictwo
dab szypulkowy
drewno bukowe
drewno debowe
buk zwyczajny
dab bezszypulkowy
proweniencje
zywotnosc
pH
Fagus sylvatica
drzewa lesne
fagus sylvatica
geographical location
quercus robur
quercus petraea
tree vitality
wood ph
Opis:
The acidity of beech (Fagus sylvatica L.) and oaks (Quercus robur L., Q. petraea (Matt.) Liebl.) wood was investigated in the context of varied crown vitality. Pairs of trees were compared, extracted from identical site and stand condition. Beech wood was sampled from 11 stands aged 80−145 years, representing 9 different Forest Districts from the entire Poland's beech distribution area. Oak wood was sampled from 13 stands aged 60−155 years, representing 12 Forest Districts. Beech wood acidity ranged 5.07−5.70, while that of oaks varied 3.40−4.26. No clear dependence between wood pH and tree vitality was found, noteworthy in the majority of analyzed pairs, the damaged tree wood was characterized by slightly lower pH.
Źródło:
Sylwan; 2005, 149, 03; 50-55
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odpornosc drewna debu szypulkowego [Quercus robur L.], z drzew o roznym stanie zdrowotnym, na rozklad powodowany przez grzyby
Resistance to decay caused by fungi of common oak [Quercus robur L.] wood from trees of different health status
Autorzy:
Szczepkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/46301.pdf
Data publikacji:
2010
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
gatunki lasotworcze
dab szypulkowy
Quercus robur
stan zdrowotny drzew
drzewa zdrowe
drzewa zamierajace
drewno debowe
rozklad drewna
grzyby
gnilica mozgowata
Coniophora puteana
zolciak siarkowy
Laetiporus sulphureus
wroslak roznobarwny
Trametes versicolor
Źródło:
Leśne Prace Badawcze; 2010, 71, 2; 125-133
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 14

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