- Type of paper
: Paper in journal
Title: Variation of Birch Wood (Betula pendula, Roth.) Fibre
Length from Natural Population of Croatia
- Authors:
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
- Despot, Radovan (137026)
- Krstinić, Ante
Journal: Šumarski list
Number: 6
ISSN: 0373-1332
Volume: 115
Year: 1991
Pages: from 273 to 284
Number of references: 22
Language: hrvatski
Summary: Presented are the results of investigation on fibre
lengthvariations from natural population of birch wood (Betula
pendula,Roth.) grown in Croatia. Fibre length vary from 0.38 mm to 1.77mm
with mean of 0.98 mm. Fibre length in trunkwood and branchwoodgrowth rings
increases from pith to bark. The amount of fibrelength increase in
trunkwood is higher than in branchwood. Fibrelength in trunkwood is
slightly higher in brest hight, than inhight of 9.3 m from the stump. The
difference is only 4%.
Fibre length in branchwood is on average for 15% shorter than intrunkwood.
Fibre length in trees from locality of Duboka is intrunkwood 12%, and in
branchwood 11% longer than in trees fromlocality of Duga Resa.
Keywords: Wood fibres length, common birch, variation in trunkwood and branchwood
- Type of paper
: Paper in journal
Title: Improvement of fir wood permeability caused by bacteria
action
- Authors:
- Despot, Radovan (137026)
Journal: Drvna industrija
Number: 1
ISSN: 0012-6772
Volume: 44
Year: 1993
Pages: from 5 to 14
Number of references: 94
Language: hrvatski
Summary: This article fucuses on the improvement of permeability
brought
about by anaerobic bacteria on fir poles. Poles, each 6 metars
long, wew divided in to three equal groups. In first group, there
were poles which had been exposed to air drying immediately after
felling. The poles from second and third group, had been
submerged in the water of Lake Bajer after felling for one and
two months respectively. After that, they were also exposed to
air drying. Following air drying, small log samples werw sawn
from each pole, those to be used in the investigation of the
improved permeability of fir wood. The logs werw exposed to
full-cell pressure impregnation by anorganic salts (CCB salts).
Investigatins had shown that the increased permeability is
observed only in the sapwood of the submerged poles, while the
heartwood remained impermable. The average sapwood permeability
of the poles submerged for two months (10.69 darcys) has become
3.9 times higher than that of the nonsubmerged poles (2.74
darcys). The value for the poles submerged for one month was 8.71
darcys, i.e. 3.17 times higher than for the nonsubmerged poles.
The increased permeability, observed on the submerged poles
sapwood has been additionally attested by increased retention and
increased penetration of waterborn salts. The average retention
of waterborn salts observed in the one month and the two month
submergence group was 73% and 75% higher, respectively that the
average retention observed in nonsubmerged poles.
At the same time, the average lateral penetration of waterborn
salts in the sapwood of the submerged poles ( 50.35 mm for the
two month and 50.53 mm for the one month submergence group) was
5.52, that is 5.54 times higher than the average lateral
panetration in nonsubmerged poles (9.12 mm). The aksial
penetration in the one and two month submergence group reached
2,5 meters from the end to the middle of the poles, which is
significantly more than the same penetration observed in
nonsubmerged poles (maximum 0,05 meters from the end to the
middle). The crushing strength (testing in compression parallel
to grain) on the sapwood of the poles submerged for one and two
maonths showed no significant reduction.
Keywords: Firwood, permeability, anaerobic bacteria
- Type of paper
: Paper in journal
Title: The effect of bacteria on wood properties
- Authors:
- Despot, Radovan (137026)
Journal: Drvna industrija
Number: 4
ISSN: 0012-6772
Volume: 43
Year: 1992
Pages: from 127 to 135
Number of references: 81
Language: hrvatski
Summary:
In this paper the effect of bacteria action on wood and
the results of the action are presented. All forms of
bacterial degradation are described, regardless of whether
the bacteria were active on wet or on air dry wood, on
unprotected or chemicaly protected wood.
The main point of interest are anaerobic bacteria,
which degrade softwood pit membranes and thoruses on early
wood tracheids. As a result of such bacterial degradation
the permeability of wood is increased, whereas its
mechanical properties are not significantly decreased.
Keywords: Bacteria, softwood, permeability
- Type of paper
: Paper in journal
Title: Some physical properties of fir wood from Gorski Kotar
- Authors:
- Sinković, Tomislav (154003)
Journal: Drvna industrija
Number: 1
ISSN: 0012-6772
Volume: 42
Year: 1991
Pages: from 17 to 21
Number of references: 4
Language: hrvatski
Summary: The main objective of this investigation was to determine
some ofthe physical properties of fir-wood: density in standard
drycondition, nominal density, volumetric srinkage and fibersaturation
point. The paper gives also the data on the moisturecontent after felling.
The results of this investigation souldhelp to determine technological
properties of fir-wood.
Keywords: Fir-wood, density of oven dry wood, fiber saturation point, volumetric shrinkage, moisture content after felling
- Type of paper
: Paper in journal
Title: HPLC analysis of monosaccharides of some home grown wood
species
- Authors:
- Tišler, Vesna
- Kanop, Majda
- Sertić, Vladimir (42956)
Journal: Drvna industrija
Number: 1
ISSN: 0012-6772
Volume: 44
Year: 1993
Pages: from 15 to 18
Number of references: 9
Language: hrvatski
Summary: The paper presents a qualitative and quantitative analysis
ofmonosaccharides in prevalent home-grown hardwood species.
The aim of this investigation was to determine the possibility ofusing the
wood residue of examined species for a production ofsugar.
Oak, chesnut, maple, beech, elm, walnut, cherry, ash and alderwood samples
were analysed.
Monosaccharides were identified by HPLC - High Performance
LiquidChromatography. Monosacharide solution was prepared by hydrolysiswith
sulphuric acid.
Monosaccharides were quantitatively determined using BIOTRONIC LC5001
apparatus combined with SHIMADZU C-R6A CHROMATOPACintegrator.
Results of investigation show that glucose and xylose are presentin
significant amounts in all examined wood samples, whereasgalactose,
mannose, and rhamnose were also identified in all woodsamples but in very
small amounts.
The obtained results show that the HPLC method applied here isadvantageous
as compared with the usual gravimetric andvolumetric procedures for the
analysis of monosaccharides inhardwoods.
Keywords: Monosaccharides, hardwoods, hydrolysis, liquid chromatography
- Type of paper
: Paper in journal
Title: Physical properties of juvenile fir-wood (Abies alba Mill)
from Gorski Kotar
- Authors:
- Sinković, Tomislav (154003)
Journal: Drvna industrija
Number: 2
ISSN: 0012-6772
Volume: 46
Year: 1995
Pages: from 59 to 68
Number of references: 25
Language: hrvatski
Summary:
Felling of small-diameter trees has posed a threat to fir-wood (Abies alba
Mill.)
in the Gorski kotar region. In logs obtained from small-diameter trees the
share of juvenile wood has been increasing. It is therefore important to be
aware of juvenile fir-wood properties in order to be able to define the
processing modes. This research has covered the properties of ring width,
oven dry wood density, basic density, longitudinal, radial, tangential and
volumetric shrinkage, and fiber saturation point for juvenile and mature
fir-wood. The research has been carried out on ten fir trees at breast
height (breast height diameter being 25-30 cm for four trees, 31-40 cm for
two trees, 41-50 cm for two trees, 60 cm and more for two trees). Juvenile
and mature wood were distinguished on the basis of the radial shift in the
trend of physical properties distribution. Such a method does not grant the
establishment of a firm line between juvenile and mature wood. Juvenile
fir-wood covers the inner part of a trunk, 30-40 rings from the pith. This
has been concluded on the basis of the radial shift in ring width
distribution trend, in density of oven dry wood and in tangential and
volumetric shrinkage trends. The other physical properties have been
neglected in final consideration because of the great variation in data.
Under the assumption that juvenile wood encompasses the thirty innermost
rings, the density of oven dry wood mean value is 0.3976 g/cm3 for
juvenile wood and 0.4977 g/cm3 for mature wood; the tangential shrinkage
mean value is 7.7% for juvenile wood and 8.8% for mature wood; the
volumetric shrinkage mean value is 11.8% for juvenile wood and 13.6% for
mature wood. If juvenile wood is assumed to spread over the forty innermost
rings, the mean values are: 0.4083 g/cm3 (juvenile wood) and 0.4512 g/cm3
(mature wood) for oven dry wood density; 8% (juvenile) and 8.9% (mature)
for tangential shrinkage; 12.3% (juvenile) and 13.7% (mature) for
volumetric shrinkage. It can be generally stated that juvenile fir-wood has
larger ring breadth, lower oven dry wood density, lower tangential
shrinkage and lower volumetric shrinkage than mature fir-wood.
Keywords: fir-wood (Abies alba Mill.), juvenile wood, ring width, density, shrinkage
- Type of paper
: Paper in journal
Title: Some physical properties of juvenile and mature fir-wood
(Abies alba Mill) from Zalesina
- Authors:
- Sinković, Tomislav (154003)
Journal: Šumarski list
Number: 7/8
ISSN: 0373-1332
Volume: 119
Year: 1995
Pages: from 237 to 244
Number of references: 9
Language: hrvatski
Summary: Research into the distribution of properties in the radial
direction with wood makes it possible to acquire knowledge of their
variability, and to determine the characteristic zones within the trunk. As
any other living organism a tree undergoes three developmental phases:
juvenile, ripeness and old age. The determination of these three phases is
possible on the basis of the recorded changes in properties. This research
is limited to the study of the differences in the properties of the two
phases; the juvenile and ripe phases of the Fir. Some physical properties
of the juvenile and ripe wood of a Fir are determined: width of an annual
ring, share of the late wood zone, density in raw condition after felling,
water content after felling, nominal density and density in the standard
dry condition. The material for research was taken from the Compartment VI
of the Belevine management unit, NPŠO Zalesina, managed by the sustainable
method. On the basis of the change of the distribution trend in the width
of the annual ring, the nominal density and the density in the standard dry
condition in the radial direction, the zone ranging from 30th to 40th
annual ring was observed, in which juvenile wood transgresses into ripe
wood. The juvenile zone in firwood spans over the first 30-40 annual rings
from the heart. The annual-ring width, nominal density and density in a
standard dry condition of the juvenile wood significantly differ from the
same properties of the ripe wood. The width of an annual ring in the
juvenile wood is bigger than the width of annual ring in the ripe wood. The
nominal density and density in a standard dry condition of the juvenile
wood is smaller than the same properties in the zone of the ripe wood.
Keywords: fir-wood (Abies alba Mill.), juvenile wood, growthring width, nominal density, oven dry density
- Type of paper
: Paper in journal
Title: Some physical and mechanical properties of the Bednja
abonos
- Authors:
- Govorčin, Slavko (27985)
- Sinković, Tomislav (154003)
Journal: Drvna industrija
Number: 1
ISSN: 0012-6772
Volume: 46
Year: 1995
Pages: from 9 to 14
Number of references: 7
Language: engleski
Summary: Oakwood buried in the ground, or abonos, is the wood
which has been exposed for a very long time to the process of
humidification under the influence of running water. It is black in colour
due to the chemical reaction between the tanstuff in the wood and the
contents of iron in the water. Besides this change in colour, there are
some other significant alterations of the physical and mechanical
properties of oakwood. Although some of its properties have changed for the
worse compared to the recent oakwood, there is a great demand for the
abonos oakwood, especially when used as veneer, interior furnishings and
manufacture of precious furniture, parts of musical instruments and
decorative woodwork.
Keywords: abonos (oakwood buried inthe ground), wood colour, physical and mechanical properties of abonos
- Type of paper
: Paper in journal
Title: The influence of microwave drynig on the permeability of
fir wood
- Authors:
- Trajković, Jelena (137030)
Journal: Drvna industrija
Number: 4
ISSN: 0012-6772
Volume: 45
Year: 1994
Pages: from 117 to 123
Number of references: 21
Language: engleski
Summary:
In this paper gas permeability of air dried fir sapwood is compared with
gas permeability of microwave dried fir sapwood, and with alcohol dried fir
sapwood; all wood was dried from green to under the fibre saturation point.
The investigation showed that the longitudinal gas permeability of
microwave dried fir sapwood is 10 times less (0.07 darcy) than the
permeability of air-dried fir sapwood (0.77 darcy), while tangential gas
permeability is nearly the same after air drying (0.0007 darcy) and
microwave drying (0.00067 darcy). Tangential gas permeability of alcohol
dried fir sapwood is 0.82 darcy. The permeability values of microwave dried
fir sapwood show greater homogeneity (lesser dissipation) than the
permeability values of air dried sapwood. The ratio between tangential and
longitudinal permeability of microwave dried fir sapwood is significantly
10 times smaller than the same ratio for air dried fir sapwood. This
indicates a reduction in anisotropy which should be investigated in more
detail on a larger sample and on more species of wood. Further
investigation should be followed by an examination of wood samples with an
electron microscope.
Keywords: fir sapwood, permeability, microwave drying.
- Type of paper
: Paper in journal
Title: European oak
- Authors:
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
Journal: Drvna industrija
Number: 1
ISSN: 0012-6772
Volume: 46
Year: 1995
Pages: from 45 to 45
Language: hrvatski
- Type of paper
: Paper in journal
Title: European cherry
- Authors:
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
Journal: Drvna industrija
Number: 2
ISSN: 0012-6772
Volume: 46
Year: 1995
Pages: from 110 to 110
Language: hrvatski
- Type of paper
: Paper in journal
Title: Wood protection and European regulations (Part I)
- Authors:
- Despot, Radovan (137026)
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
Journal: Drvna industrija
Number: 2
ISSN: 0012-6772
Volume: 46
Year: 1995
Pages: from 80 to 85
Number of references: 13
Language: hrvatski
Summary: Wood, being a product of a living tree, is liable to
deterioration due to abiotic and biotic factors. The rate of wood
degradation is dependent on its natural durability which varies from
species to species. Those of poor natural durablility have to be chemically
protected to prolong their time of service. Intensity of protection depends
on the environmental conditions in which the wood is used. Various European
regulations are made concerning the ways of choosing the wood species,
chemicals and intensity of protection, all depending on the place of use.
In view of the intention of Croatian economy to participate on the European
market, this article wants to review European regulations in the field of
wood protection, and thus help Croatian regulations to be in keeping with
the European ones.
The first part of the article describes mechanisms of the most important
wood deteriorating factors, while the second one presents European
regulations in the field of wood protection.
špageđ8ć
Keywords: wood deterioration, wood preservation, standards for wood preservation. špageđ8ć
- Type of paper
: Paper in journal
Title: Some structural characteristics of ashwood (Fraxinus
angustifolia Vahl.) from the Lipovljani region in Croatia
- Authors:
- Despot, Radovan (137026)
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
Journal: Drvna industrija
Number: 1
ISSN: 0012-6772
Volume: 46
Year: 1995
Pages: from 15 to 20
Number of references: 8
Language: engleski
Summary:
Among the problems concernig the rationale processing of thin logs, in this
work the structure of juvenile and adult ashwood has been researched.
Variations in fibers lengths and diameters; thicknesses of their membranes;
diameters of late wood and early wood vessels, and volume percentage of
vessel members; width and height of rays, and rays volume percentage, have
all been researched. Necessary measurements in annual rings age 5, 10, 20,
40, 70 and 100 have been made. It has been found out that the juvenile
ashwood spreads from the pith up to approximately 40th annual ring.
Keywords: variations of structural elements, juvenile wood, adult wood, ashwood.
- Type of paper
: Paper in journal
Title: Contribution of the knowledge of the Adriatic sea wood
marine borers
- Authors:
- Despot, Radovan (137026)
Journal: Drvna industrija
Number: 3
ISSN: 0012-6772
Volume: 45
Year: 1994
Pages: from 90 to 97
Number of references: 8
Language: hrvatski
Summary:
In this article, the species of marin borers from all over the
world especialy from the Mediterranean and the Adriatic sea, are
mentioned.
Much information about marine borers has been colected from the
some relevant world literature. The author's intention was to
determine all species of wood marine borers which probably live
in the Adriatic sea. In regard to accelerated trend of seascape
construction (marinas) on the whole of the Adriatic coast and the
fact that marin wood borers sometimes appear epidemically, some
kinds of preserving methods and preservatives are mentioned.
Keywords: marine wood borers, Mediterranean sea and Adriatic sea, chemical protection of wood in the sea.
- Type of paper
: Paper in journal
Title: Legal Regulations in the Field of Industrial Waste Waters
in Three Members of the Business Community Alps-Adria
- Authors:
- Sertić, Vladimir (42956)
- Tišler, Vesna
- Šantelj, Danica
Journal: Les
Number: 6
ISSN: 0024-1067
Volume: 46
Year: 1994
Pages: from 179 to 182
Number of references: 5
Language: slovenski
Summary:
The article describes water protection legislation in force in three
members of the Business Community Alps-Adria: the Republic of Slovenia, the
Republic of Croatia and the Trentino-South Tirol Region. The specified
limit values for individual parameters are different in each member of the
Community. In future, greater harmonization of regulations as well as
cooperation in the preparation of relevant European regulations in the
Alpine-Adriatic region are expected.
Keywords: Key words: industrial waste waters, water protection, timber industry, chemical oxygen demand, biochemical oxygen demand.
- Type of paper
: Paper in proceedings
Title: Increasing the permeability of firwood (Abies alba, Mill.)
as a method of protection
- Authors:
- Despot, Radovan (137026)
- Editors
- Grbac, Ivica (85982)
Proceedings title: Razvoj i perspektive finalne obrade drva
Language: hrvatski
Place: Zagreb
Year: 1991
Pages: from 89 to 95
Meeting: Razvoj i perspektive finalne obrade drva
Held: from 04/18/91 to 04/18/91
Summary: This paper shows how anaerobic bacteria can help increase
thepermeability of firwood poles. The poles were immersed in thewater in
the lake of Bajer near Fužine and then left to dry.Permeability was
increased only in the sapwood zone, whereas thepermeability of the
heartwood remained low. The length ofimmersion (one and two months) did not
have any significantinfluence on the permeability of the sapwood in the
poles. Theaverage permeability of sapwood in the poles which were
immersedfor one month was increased 3.9 times, and in the poles immersedfor
two months the average permeability was increased 4.8 timesin relation to
average permeability of sapwood in the poles whichhad not been immersed in
water.
Keywords: Firwood, permeability
Other: Prethodno priopćenje
- Type of paper
: Paper in proceedings
Title: Physical Characteristics of Firwood (Abies alba, Mill.)
from Gorski Kotar Area
- Authors:
- Govorčin, Slavko (27985)
- Sinković, Tomislav (154003)
- Editors
- Grbac, Ivica (85982)
Proceedings title: Razvoj i perspektive finalne obrade drva
Language: hrvatski
Place: Zagreb
Year: 1991
Pages: from 109 to 115
Meeting: Razvoj i perspektive finalne obrade drva
Held: from 04/18/91 to 04/18/91
Summary: In order to determine technical characteristics of a
particularwood species, we have to be familiar with its basic
physicalcaracteristics. Mean values of characteristics and theirvariability
facilitate comparison of the caracteristics analysedwith the results
obtained in other studies. These data help us todetermine which technology
to use in wood processing in order tomake the most of the caracteristics of
a particular wood species.It is indispensable to analyze characteristics of
wood species interms of their distribution in the various parts of the
treelongitudinally and transversally. Variability in the distributionof a
particular characteristic points to the fact that choice ofa technological
procedure in wood processing must be adapted toparticular zones in trees.
Keywords: Physical caracteristics of wood, variability, distribution of characteristics longitudinally and transversally
- Type of paper
: Paper in proceedings
Title: Solar Energy Used for Drying Solid Wood in Furniture
Manufacture
- Authors:
- Pavlin, Zdenko (35655)
- Editors
- Grbac, Ivica (85982)
Proceedings title: Razvoj i perspektive finalne obrade drva
Language: hrvatski
Place: Zagreb
Year: 1991
Pages: from 39 to 44
Meeting: Razvoj i perspektive finalne obrade drva
Held: from 04/18/91 to 04/18/94
Summary: Due to recession and the need to rationalize energy
consumption,smaller furniture manufacturers have become more interested
inuse of solar energy drying processes. The development ofalternative
sources of energy has generally gained importancetoday.
Keywords: Use of solar energy, rational energy consumption, drying process costs
- Type of paper
: Paper in proceedings
Title: Thestudy of water solubile compounds of beech wood (Fagus
silvatica L.) during its storage in water
- Authors:
- Melcer, Imrich
- Kačik, František
- Solar, Rastislav
- Melcer, Anna
- Šindler, Jan
- Sertić, Vladimir (42956)
- Editors
- Babiak, Marian
Proceedings title: Zbornik vedeckyh prac Drevarskej Fakulty Technickej Univerzity vo Zvolene
Language: slovački
Place: Bratislava, Slovačka
Year: 1992
ISBN/ISSN: 80-05-00984-4
Pages: from 41 to 56
Summary: Samples of beech wood (Fagus silvatica L.) with dimensions
20 x20 x 20 mm were stored in different media (destilled water,destilled
water with addition of 0.05% of Ajatin, ordinary water)for 90 days. The
wood to water ratio was the same in eachexperiment - 1:5. The aliquot parts
of water extracts wereanalysed for saccharides and phenolic compounds
contents. The pHvalues of extracts and the weigth loss of wood specimen
wasdetermined, too. Also the influence of anatomical direction ofwater
diffusiion through spedimen was investigated.
Obtained experimental data allow to formulate the followingconclusions:
-the pH values of water extracts drop to aproximate value of 4 inthe first
stages of water extraction, prolonged time of treatmentresulted in an
increase of pH to 7; weight loss of examined woodsamples varied between
2.42 to 2.81 per cent, after 90 days oftreatment;
- the amount of saccharides in extracts was raising in the first7 days of
storage, prolonged time of treatment resulted indiminished contents of
saccharides. The retarding influence of"ajatine" addion on the
biodegradation was evident, the influenceof direction of diffusion of water
was not expressive;
- amounts of phenolic compounds in investigated extracts wereincreasing
with time of storage, the highest increase of theirconcentration being
observed during the first 7 days oftreatment; the influence of direction of
water penetration wasnegligibible again.
Keywords: Beech wood, water soluble compounds, weight loss, saccharides, phenolic compounds
- Type of paper
: Paper in proceedings
Title: Investigation of polysaccharidic proportion of stem and
branches of pine (Pinus silvestris L.) in relation to felling period
- Authors:
- Melcer, Imrich
- Solar, Rastislav
- Melcer, Anna
- Sertić, Vladimir (42956)
- Editors
- Babiak, Marian
Proceedings title: Zbornik vedeckyh prac Drevarskej Fakulty Technickej University vo Zvolene
Language: slovački
Place: Bratislava, Slovačka
Year: 1992
ISBN/ISSN: 80-05-00984-4
Pages: from 57 to 75
Summary: From the viewpoint of preparation purity of holocelluloses
aswell as the material balance of individual components andfunctional
groups, the method of isolation of the totalpolysaccharidic pine wood
proportion according to Wise proved tobe the most suitable one. The amount
of the total polysaccharidicproportion after correction for the amount of
ash and lignin isapproximately by 4% higher in stem timber than in
branches. Thefelling period does not affect the total amount of
holocellulosesin extracted sawdust of stem and branches.
Keywords: Pine, felling period, total polysaccharides, stem, branches
- Type of paper
: Paper in proceedings
Title: Influence of melamine on the amount of free formaldehyde
in urea formaldehyde adhesives used for
- Authors:
- Melcer, Imrich
- Melcer, Anna
- Kačik, František
- Šindler, Jan
- Sertić, Vladimir (42956)
- Editors
- Babiak, Marian
Proceedings title: Zbornik vedeckych prac Drevarskej Fakulty Technickej Univerzity vo Zvolene
Language: slovački
Place: Bratislava, Slovačka
Year: 1992
ISBN/ISSN: 80-05-00984-4
Pages: from 77 to 114
Summary: The influence of melamine as a modifier on the properties
of ureaformaldehyde resin was investigated in this work. Somecharacteristic
properties of two kinds of resins, i.e. ureaformaldehyde and urea melamine
formaldehyde resins at a differenturea and formaldehyde mole ratio with a
constant addition ofmelamine were compared. This addition of melamine
results inshortening of condensation time of resin at a lower urea
andformaldehyde mole ratio, in reduction of the total amount offormaldehyde
in resin and in reduction of formaldehyde liberatedfrom the glued joint.
This was proved above all in resin with theurea and formaldehyde mole ratio
of 1:1.2.
Keywords: Birch wood, adhesives, melamine, formaldehyde, mole ratio
- Type of paper
: Paper in proceedings
Title: Some physical and mechanical properties of the Bednja
abonos
- Authors:
- Govorčin, Slavko (27985)
- Sinković, Tomislav (154003)
- Editors
- Babiak, Marian
- Požgaj, Alexander
Proceedings title: Wood structure and properties '94
Language: engleski
Place: Zvolen, Slovačka
Year: 1994
ISBN/ISSN: 80-228-0377-4
Pages: from 143 to 150
Meeting: Wood structure and properties '94
Held: from 09/05/94 to 09/09/94
Summary: Oakwood buried in the ground, or abonos, is the wood
which has been exposed for a very long time to the process of
humidification under the influence of running water. It is black in colour
due to the chemical reaction between the tanstuff in the wood and the
contents of iron in the water. Besides this change in colour, there are
some other significant alterations of the physical and mechanical
properties of oakwood. Although some of its properties have changed for the
worse compared to the recent oakwood, there is a great demand for the
abonos oakwood, especially when used as veneer, interior furnishings and
manufacture of precious furniture, parts of musical instruments and
decorative woodwork.
Keywords: abonos (oakwood buried in the ground), wood colour, physical and mechanical properties of abonos
Other: Radi bolje obavještenosti domaće javnosti, ovaj je rad
objavljen i u časopisu Drvna Industrija.
- Type of paper
: Paper in proceedings
Title: Distribution of properties of fir-wood throughout the
cross section
- Authors:
- Govorčin, Slavko (27985)
- Sinković, Tomislav (154003)
- Editors
- Butković, Jurica (70022)
Proceedings title: Uključivanje znanosti u gospodarski sustav preradbe drva u Hrvatskoj
Language: hrvatski
Place: Novi Vinodolski, Hrvatska
Year: 1994
Pages: from 36 to 41
Meeting: Uključivanje znanosti u gospodarski sustav preradbe drva u Hrvatskoj
Held: from 05/11/94 to 05/12/94
Summary: Distribution of properties throughout the cross section of
trunk shows great differences in values. The influence of these differences
in technical properties of wood on the optimal use of wood as a raw
material demands the knowledge about these differences in one species and
between species. Differences in properties and their importance in
utilisation of wood will be greater with pulling down younger trees and
small diameter trees, that is with larger contents of small diameter trunks
as a raw material.
Keywords: distribution of wood properties, zones of wood properties, tecnical properties of wood
- Type of paper
: Paper in proceedings
Title: Some structural characteristics of ashwood (Fraxinus
angustifolia Vahl.) from the Lipovljani region in Croatia
- Authors:
- Despot, Radovan (137026)
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
- Editors
- Požgaj, Alexander
- Babiak, Marian
Proceedings title: Wood structure and properties '94
Language: engleski
Place: Zvolen, Slovačka
Year: 1994
ISBN/ISSN: 80-228-0377-4
Pages: from 5 to 12
Meeting: Wood structure and properties '94
Held: from 09/05/94 to 09/09/94
Summary:
Among the problems concernig the rationale processing of thin logs, in this
work the structure of juvenile and adult ashwood has been researched.
Variations in fibers lengths and diameters; thicknesses of their membranes;
diameters of late wood and early wood vessels, and volume percentage of
vessel members; width and height of rays, and rays volume percentage, have
all been researched. Necessary measurements in annual rings age 5, 10, 20,
40, 70 and 100 have been made. It has been found out that the juvenile
ashwood spreads from the pith up to approximately 40th annual ring.
Keywords: variations of structural elements, juvenile wood, adult wood, ashwood.
Other: Radi bolje obavještenosti domaće javnosti, ovaj je rad
objavljen i u časopisu Drvna Industrija.
- Type of paper
: Paper in proceedings
Title: Ecology and wood protection
- Authors:
- Despot, Radovan (137026)
- Editors
- Butković, Jurica (70022)
Proceedings title: Uključivanje znanosti u gospodarski sustav preradbe drva u Hrvatskoj
Language: hrvatski
Place: Novi Vinodolski, Hrvatska
Year: 1994
Pages: from 19 to 22
Meeting: Uključivanje znanosti u gospodarski sustav preradbe drva u Hrvatskoj
Held: from 05/11/94 to 05/12/94
Summary:
This paper has concentrated on innovative new preservative and
treatment systems for wood protection and theirs reflection on
humans environment and ecology.. In general, the potential of
high toxicty of wood protection chemicals dictates the need to
protect the environment and humans from its harmful effects. The
development of new or modification of existing preservatives
systems will likelyprovide the industry with new alternatives
that will make it easer to complywith the ever changing
environmental and safety regulations.The use of combination
bocides has the potentional for reducing the total amount of
preservative injected into wood, hence lowering potential
environmental impact. Advcing treatment technology may allow
treaters of the future to put biocides into the wood structure in
such a way that they are more effective and less dangerious for
human's environmental and ecology.
Keywords: Wood protecting chemicals, environment, ecology, wood protection treatment processes
- Type of paper
: Paper in proceedings
Title: Development of cellulose production from annual plants
- Authors:
- Kljajić, Filip
- Sertić, Vladimir (42956)
- Editors
- Butković, Jurica (70022)
Proceedings title: Uključivanje znanosti u gospodarski sustav preradbe drva u Hrvatskoj
Language: engleski
Place: Novi Vinodolski, Hrvatska
Year: 1994
Pages: from 23 to 26
Meeting: Uključivanje znanosti u gospodarski sustav preradbe drva u Hrvatskoj
Held: from 05/11/94 to 05/12/94
- Type of paper
: M.A.
Title: The influence of microwave drying on the permeability of
home grown fir wood (Abies alba, Mill.)
Faculty: Šumarski Zagreb
Author: TRAJKOVIĆ JELENA
Date of defense: 10/08/93
Language: hrvatski
Number of pages: 42
Summary: In this paper gas permeability of air dried fir sapwood is
compared with gas permeability of microwave dried fir
sapwood, both dried from green to under fiber saturation
point. The investigation showed that the longitudinal gas
permeability of microwave dried fir sapwood is 10 times
lesser (0.07 darcy) than the permeability of air dried fir
sapwood (0.77 darcy), while tangential gas permeability is
nearly equal after air drying (0.0007 darcy) and microwave
drying (0.00067 darcy). The values of permeability of
microwave dried fir sapwood show greater homogenity (lesser
dissipation) than the values of permeability of air dried
sapwood. The ratio between tangential and longitudinal
permeability of microwave dried fir sapwood is significantly
10 times lesser than the same ratio of air dried fir
sapwood. This indicates the reduction of anisotropy which
should be investigated in detail on larger sample and on
more species of wood. Further investigation should be
followed by examination of the samples of wood by electron
microscope.
Keywords: Fir sapwood, permeability, microwave drying
- Type of paper
: M.A.
Title: Improvement of fir wood permeability caused by bacteria
action
Faculty: Šumarski Zagreb
Author: DESPOT RADOVAN
Date of defense: 06/21/91
Language: hrvatski
Number of pages: 89
Summary: This article fucuses on the improvement of permeability
brought
about by anaerobic bacteria on fir poles. Poles, each 6 metars
long, wew divided in to three equal groups. In first group, there
were poles which had been exposed to air drying immediately after
felling. The poles from second and third group, had been
submerged in the water of Lake Bajer after felling for one and
two months respectively. After that, they were also exposed to
air drying. Following air drying, small log samples werw sawn
from each pole, those to be used in the investigation of the
improved permeability of fir wood. The logs werw exposed to
full-cell pressure impregnation by anorganic salts (CCB salts).
Investigatins had shown that the increased permeability is
observed only in the sapwood of the submerged poles, while the
heartwood remained impermable. The average sapwood permeability
of the poles submerged for two months (10.69 darcys) has become
3.9 times higher than that of the nonsubmerged poles (2.74
darcys). The value for the poles submerged for one month was 8.71
darcys, i.e. 3.17 times higher than for the nonsubmerged poles.
The increased permeability, observed on the submerged poles
sapwood has been additionally attested by increased retention and
increased penetration of waterborn salts. The average retention
of waterborn salts observed in the one month and the two month
submergence group was 73% and 75% higher, respectively that the
average retention observed in nonsubmerged poles.
At the same time, the average lateral penetration of waterborn
salts in the sapwood of the submerged poles ( 50.35 mm for the
two month and 50.53 mm for the one month submergence group) was
5.52, that is 5.54 times higher than the average lateral
panetration in nonsubmerged poles (9.12 mm). The aksial
penetration in the one and two month submergence group reached
2,5 meters from the end to the middle of the poles, which is
significantly more than the same penetration observed in
nonsubmerged poles (maximum 0,05 meters from the end to the
middle). The crushing strength (testing in compression parallel
to grain) on the sapwood of the poles submerged for one and two
maonths showed no significant reduction.
Keywords: Fir wood, permeability, anaerobic bacteria
- Type of paper
: M.A.
Title: Physical and mechanical properties of juvenile fir wood
(Abies alba Mill.) from Gorski Kotar
Faculty: Šumarski Zagreb
Author: SINKOVIĆ TOMISLAV
Date of defense: 06/21/94
Language: hrvatski
Number of pages: 112
Summary: This research deal with determination of physical and
mechanical properties of juvenile and adult fir-wood. Research of the
distribution of properties in radial direction was taken to acquire
knowledge of their variability, and to determine the characteristic zones
within the trunk. The research material was taken from the compartment VI
of the Belevine management unit in Zalesina, managed by the sustainable
method. The research has been carried out on ten fir trees at breast height
(breast height diameter being 25-30 cm for four trees, 31-40 cm for two
trees, 41-50 cm for two trees, 60 cm and more for two trees). Juvenile and
mature wood were distinguished on the basis of the radial shift in the
trend of physical and mechanical properties distribution. The juvenile zone
in fir-wood spreads over the first 30-40 annual rings from the heart. It
can be generally stated that juvenile fir-wood has larger ring width, lower
oven dry wood density, lower tangential shrinkage, lower volumetric
shrinkage, lower bending strength and lower compression strength than
mature fir-wood.
Keywords: fir-wood (Abies alba Mill.), juvenile wood, ring width, density, shrinkage, bending strength, compression strength.
- Type of paper
: Mentorship
Title: Improvement of fir wood permeability caused by bacteria
action
Faculty: Šumarski Zagreb
Date of defense: 06/21/91
Number of pages: 89
Author: Despot Radovan
Degree level: M.A.
- Type of paper
: Mentorship
Title: The influence of microwave drying on the permeability of
home growm fir wood (Abies alba, Mill.)
Faculty: Šumarski Zagreb
Date of defense: 10/08/93
Number of pages: 42
Author: Trajković Jelena
Degree level: M.A.
- Type of paper
: Mentorship
Title: Physical and mechanical properties of juvenile fir wood
(Abies alba Mill.) from Gorski Kotar
Faculty: Šumarski Zagreb
Mentor: PETRIĆ BOŽIDAR
Date of defense: 06/21/94
Number of pages: 112
Author: Sinković Tomislav
Degree level: M.A.
- Type of paper
: Survey/Study
Title: Techical regulations for chemical protection of wooden
elements for fences and roofings
- Authors:
- Despot, Radovan (137026)
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
- Krznarić, Ivan
Ordering party: FINVEST - CORP d.d. za proizvodnju, trgovinu i usluge
Institution depot: FINVEST - CORP d.d. za proizvodnju, trgovinu i usluge
Year: 1994
Number of pages: 14
Language: hrvatski
- Type of paper
: Survey/Study
Title: Technical regulations for making and impregnation of
timber poles for overhead lines
- Authors:
- Despot, Radovan (137026)
- Krznarić, Ivan
- Petrić, Božidar (36862)
- Trajković, Jelena (137030)
Ordering party: FINVEST - CORP d.d. za proizvodnju, trgovinu i usluge
Institution depot: FINVEST - CORP d.d. za proizvodnju, trgovinu i usluge
Year: 1995
Number of pages: 71
Language: hrvatski
- Type of paper
: Survey/Study
Title: Conditions, directions and strategy of development of
paper production and processing in Republic of Croatia
- Authors:
- Sertić, Vladimir (42956)
- Kljajić, Filip
Ordering party: CROATIADRVO
Institution depot: CROATIADRVO
Year: 1995
Number of pages: 73
Language: hrvatski
- Type of paper
: Manuscript
Title: Wood anatomy (Wood structure and growth)
- Authors:
- Petrić, Božidar (36862)
Language: hrvatski
Other: Skripta ili udžbenik za studente Šumarskog fakulteta u
Zagrebu
- Type of paper
: Other
Title: The first sterilisation of wooden objects with nitrogen
(N2) in Croatia, Ludbreg, 22.11.1994 - 4.1.1995.
- Authors:
- Despot, Radovan (137026)
- Hrašovec, Boris
Type of work: Obavijest o novom tehnološkom postupku izvedenom po prvi put u Hrvatskoj
Language: hrvatski
