Wyniki wyszukiwania - Biblioteka Nauki

1

Investigations of the influence of low frequency ultrasonic irradiation on the changes of lignin-carbohydrate complex

100%

Wojciak A.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

1992

|

tom 23

53-63

2

Drewno wazniejszych gatunkow drzew. Sapeli [Entandrophragma cylindricum Sprague] - drewno egzotyczne z Afryki

86%

Kozakiewicz P. , Szkarlat D.

Przemysł Drzewny

|

2004

|

tom 55

|

nr 09

27-30

3

Program WinCELL - narzedzie do analizy preparatow mikroskopowych komorek drewna

86%

Klisz M.

Leśne Prace Badawcze

|

2009

|

tom 70

|

nr 3

303-306

4

Wlasciwosci drewna modrzewia rosnacego na zwalowiskach gorniczych

86%

Splawa-Neyman S. , Malecki S. , Owczarek Z.

Las Polski

|

1992

|

nr 13-14

20-21

5

Influence of low frequency ultrasonic field on the changes of anatomical wood structure

86%

Wojciak A.

Folia Forestalia Polonica. Series B - Drzewnictwo

|

1992

|

tom 23

43-51

6

Drewno wazniejszych gatunkow drzew. Balsa [Ochroma lagopus Sw.] - drewno egzotyczne z Ameryki Srodkowej i Poludniowej

86%

Kozakiewicz P.

Przemysł Drzewny

|

2004

|

tom 55

|

nr 05

43-46

7

Variation in cellulose content in the stem of pine wood [Pinus silvestris L.]

86%

Krutul D.

Annals of Warsaw Agricultural University. Forestry and Wood Technology

|

1994

|

tom 45

43-49

8

Zmiany w budowie i właściwościach drewna jako efekt oddziaływania wiatru na drzewa

86%

Tomczak A. , Jelonek T. , Jakubowski M.

Sylwan

|

2012

|

tom 156

|

nr 10

9

Elementarne procesy rozwojowe wystepujace w kambium zwiazane z tworzeniem drewna

86%

Tulik M.

Sylwan

|

2001

|

tom 145

|

nr 08

93-108

10

Badania wlasciwosci i innowacyjne zastosowania drewna egzotycznego w Polsce

86%

Kozakiewicz P. , Koscielniak C. , Zakrzewska-Rudzinska W.

Przemysł Drzewny

|

2008

|

tom 59

|

nr 04

18-23

11

Drewno wazniejszych gatunkow drzew. Mansonia [Mansonia altissima A.Chev.] - drewno egzotyczne z zachodniej Afryki

72%

Kozakiewicz P.

Przemysł Drzewny

|

2004

|

tom 55

|

nr 10

27-30

12

Sredniowymiarowy surowiec drzewny

72%

Splawa-Neyman S.

Prace Instytutu Technologii Drewna

|

1998

|

tom 42

|

nr 3-4

37-59

13

Drewno wazniejszych gatunkow drzew. Tauari [Couratari sp.] - drewno egzotyczne z Ameryki Poludniowej

72%

Kozakiewicz P. , Mogilnicki W.

Przemysł Drzewny

|

2005

|

tom 56

|

nr 09-10

21-24

14

Drewno wazniejszych gatunkow drzew. Gombeira [Melanoxylon brauna Schott] - drewno egzotyczne z Ameryki Poludniowej

72%

Kozakiewicz P. , Saks M.

Przemysł Drzewny

|

2005

|

tom 56

|

nr 11-12

29-32

15

Drewno wazniejszych gatunkow drzew. Bilinga [Nauclea diderrichii De Wild] - drewno egzotyczne z Afryki

72%

Kozakiewicz P. , Szkarlat D.

Przemysł Drzewny

|

2005

|

tom 56

|

nr 07-08

43-46

16

Wlasciwosci i wykorzystanie jalowca pospolitego [Juniperus comunis L.]

72%

Surminski J.

Sylwan

|

2004

|

tom 148

|

nr 07

46-52

17

Charakterystyka techniczna drewna modrzewia dahurskiego (Larix gmellini (Rupr.) Kuzen.)

72%

Jankowska A. , Anders B. , Wojcik A.

Sylwan

|

2019

|

tom 163

|

nr 01

EN

The wood present in trade in Poland named as ‘Siberian larch’, in fact belongs to two tree species: Larix sibirica Ledeb. and Larix gmelinii (Rupr.) Kuzen. The term itself is rather associated with the origin of wood. While Larix sibirica wood is the subject of many research, characteristics of Larix gmelinii still require additions. The main aim of this paper was to describe the technical properties of Dahurian larch wood. We characterised also the microstructure of the wood. Moreover, durability against fungi−caused brown rot was tested. The wood from the Chabarowsk area (Russia) was tested. The properties of wood were determined in accordance with the recommendations of the Polish standards. The obtained results allow to conclude that Dahurian larch wood is characterized by medium shrinkage and typical shrinkage anisotropy (total radial shrinkage was 5.0% and in the tangential direction 7.6%). With the average density of this wood in an air−dry state equal to 620 kg/m³, average mechanical properties are associated – modulus of elasticity 12.5 GPa and Janka hardness on the cross−section of 57 MPa. These values are similar to those of Siberian larch. Dahurian larch heartwoods is characterized by low durability (4th class of natural durability to fungi in a 5−degree scale). It causes that wood used in external environment require special attention and use of wood preservatives.

18

Właściwości fizyczne i mechaniczne oraz budowa anatomiczna drewna jałowca pospolitego (Juniperus communis L.)

72%

Kozakiewicz P. , Zyczkowski W.

Sylwan

|

2015

|

tom 159

|

nr 02

EN

The common juniper is a well−known arboreal plant with wide range of the occurrence and small habitat requirements. It is the most numerous coniferous shrub in Poland, sometimes taking shape of small tree. There is no sufficient data about the anatomy as well as physical and mechanical properties of common juniper wood in available literature. Hence, the objectives of this paper were to supplement the knowledge about the properties and anatomy of the juniper wood. The nine trunks of the common juniper of column shape were harvested to this investigation. These small trees with height up to 5 meters were 34−38 years−old. They grew on postagricultural area on brown podzol (common sand) in Łomża Forest District (E Poland). It is a sunny area on the rim of subcontinental fresh coniferous forest – one of the typical and favourable habitat for the common juniper in Poland. We analysed the microstructural elements of common juniper wood. The main component of the microstructure are short (average length 2.5 mm) and thin−walled tracheids (wall thickness from 2.4 µm in traheids of spring wood to 4.2 µm in tracheids of summer wood). Domination of this type of microstructural elements has influence on physical and mechanical properties of wood. Investigated wood characterised with low coefficient of shrinkage. The volumetric coefficient of shrinkage is 10.2%, so the wood has not tendency to crack and distort. The common juniper wood has slightly higher density (562 kg/m3 in air−dry state) than Scots pine wood and similar hardness, shear strength (91 MPa), static bending strength (85 MPa) and compression strength parallel to grain (49 MPa). The latter is directly proportional to density of the wood. The other mechanical properties of common juniper wood: modulus of elasticity and tension strength parallel to grain are significantly lower than for Scots pine wood. It is the influence of wood microstructure, not rectilinear arrangement of cell in wood and significant content of juvenile wood. Considering these aspects and modes dimensions of common juniper raw material, the potential use are different including small wooden articles especially kitchen accessories.

19

Dendrochronologiczny zapis niewielkich trzęsień ziemi występujących na Podhalu

72%

Michalowicz P. , Malik I. , Wistuba M.

Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej

|

2014

|

tom 16

|

nr 3[40]

20

Drewno wazniejszych gatunkow drzew. Araputanga [Swietenia macrophylla King] - mahon amerykanski

72%

Kozakiewicz P. , Szkarlat D.

Przemysł Drzewny

|

2004

|

tom 55

|

nr 04

39-42