Agnieszka Jankowska | Szkoła Główna Gospodarstwa Wiejskiego (original) (raw)
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Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2014
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2014
Comparison of thermal properties of selected wood species intended to woodwork windows production... more Comparison of thermal properties of selected wood species intended to woodwork windows production. The work deals with the issue of density, moisture content and thermal properties of wood: thermal conductivity, specific heat and temperature compensation coefficient. The scope of study included mostly tropical wood (bintangor, dark red meranti, framire) and as reference Scots pine). The basic attribute of wood is its density. Thermal conductivity across the fibers is strongly dependent (directly proportional) on density of wood as well as temperature compensation coefficient, but in lower extent.
Drewno, 2016
The main objective of this research was to determine the fibre saturation point of tropical wood.... more The main objective of this research was to determine the fibre saturation point of tropical wood. Two different methods were used to achieve this aim: the logarithm of strength properties versus moisture content and volumetric shrinkage-moisture content plot to zero shrinkage. The test included selected wood species from Africa: Opepe, Iroko, African padouk, and Wenge, and South America: American mahogony and Ipe. For comparison, selected domestic wood species of a similar structure – European beech (Fagus sylvatica L.) – were also tested. Determination of the fibre saturation point of the selected wood species using two methods delivered similar results (the small differences were not significant). The results showed that, generally, the fibre saturation point of the tropical wood species was lower than in the case of the European wood species. The lowest values of the fibre saturation point were shown by the African padouk and Ipe (approx. 17 %). Moreover, it was found that in the...
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2014
Drvna industrija, 2021
The main objective of this work was to evaluate the effects of flat slicing processes on wood sur... more The main objective of this work was to evaluate the effects of flat slicing processes on wood surface characteristics of the European beech (Fagus sylvatica L.). The relation between wettability, roughness and machining methods were studied. Two different wood thickness (3.4 and 4.0 mm) and three levels of compression during slicing (67.5 %, 57.5 % and 47.5 % of desired veneer thickness) were used to prepare surfaces prior to testing. The smaller variation of the thickness of thinner veneers was observed. No significant impact of compression on variation of the thickness was found. The contact angle was lower when roughness measured parallel to the grain was higher. The influence of selected compression on roughness of European beech veneers measured perpendicular to the grain was confirmed. This indicated that the influence of the set of machining processes, such as pressure bar setting during slicing, is significant for wooden veneers surface properties.
Frontiers in Plant Science, 2021
Most old roses are difficult to root when propagated by cuttings. This research focused on the re... more Most old roses are difficult to root when propagated by cuttings. This research focused on the response of stem cuttings ofRosa“Hurdal” to plant origin preparations used as rhizogenesis enhancers through changes to the anatomical structure of the basal part of the stem. Cuttings derived from shoots in four phenological stages were prepared for the experiment: flower buds closed (H1); fully flowering (H2); immediately after petals have fallen (H3); 7–14 days after petals have fallen (H4). The cuttings were treated with 0.4% indole butyric acid (IBA; Ukorzeniacz Aaqua) or 0.2% naphthalene acetic acid (NAA; Ukorzeniacz Baqua), and with plant origin preparations: Algae extract (Bio Rhizotonic), Organic preparation (Root JuiceTM), and Plant extract (Bio Roots). A high rooting percentage in comparison to the control (27.5%) was obtained after treatments of the H1 cuttings with Algae extract (90%), Organic preparation (80%), and Plant extract (75%). The H4 cuttings did not root, probably a...
Maderas. Ciencia y tecnología, 2018
Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2017
The research was conducted on five once-blooming different origin historical roses. The aims were... more The research was conducted on five once-blooming different origin historical roses. The aims were establishing differences in the anatomical structure of shoots taken in four maturity stages and their natural ability to roots creating. There were hypothesized, that the changes in anatomical structure occur in the time of flowering and may affect the ability of rhizogenesis. Single node one leaf cuttings of chosen cultivars were cut from shoots in four maturity phases: flower buds closed, all flowers open, just after and 7-14 days after petal fall. The cuttings were planted in multipot trays in peat substrate without using rooting stimulators. The anatomical structure of shoots in the place of rhizogenesis were observed, the width of xylem layer and cambial zone, diameter of vascular cells were measured. The percentage of rooted cuttings and forming only a callus were counted. Adventitious roots appeared probably in the cambium zone, pith rays, and also in the zone of phloem and peri...
Heat treatment is often applied to wood to improve its properties. This study examined the effect... more Heat treatment is often applied to wood to improve its properties. This study examined the effect of heat treatment on certain mechanical properties of Scots pine (Pinus sylvestris L.), which is widely used in industry. The influence of thermal treatment on the compression strength, shear strength, modulus elasticity in bending, static bending strength, cleavage strength and Brinell hardness has been investigated. Wood was subjected to heat treatment under atmospheric pressure at varying temperatures (150, 160, 170 and 180 °C) in overheated steam. Modification of Scots pine wood affected mechanical properties of wood but observed changes (bending strength, modulus of elasticity, Brinell hardness) are not statistically significant. Only increase of compression strength along the fibers and decreased cleavage strength are clear. Optimal temperature of thermal modification ranges from 160 to 170 °C.
Forests, 2020
Scots pine (Pinus sylvestris L.) is a widespread species throughout Europe and at the same time i... more Scots pine (Pinus sylvestris L.) is a widespread species throughout Europe and at the same time is dominant in Polish forests and of key importance in the wood industry. Pine stands are subjected to numerous environmental stresses, and one of them is the different physico-chemical and biological properties of post-agricultural soils compared to forest soils, which may affect the properties of the resulting wood and its industrial suitability. The research material taken at the height of 1.3 m from tree trunks (breast height diameter, dbh) in the form of sections and discs was collected in an 80-year-old pine stand from four plots, representing former agricultural and ancient forest land, and two types of habitats: fresh coniferous forest and fresh mixed coniferous forest. The forest habitat trophy had a decisive impact on the dendrometric characteristics and properties of pine wood (density, modulus of elasticity, bending strength, and compressive strength along the tracheids). The ...
Wood research
The purpose of study was to comparison of outdoor and artificial weathering of wood using compres... more The purpose of study was to comparison of outdoor and artificial weathering of wood using compressive strength along fibers. The study involved tropical wood species from South America: garapa (Apuleia leiocarpa (Vog.) Macbride.) and angelim pedra (Hymenolobium sp.) available commercial in Europe and Scots pine (Pinus sylvestris L.) and European oak (Quercus sp.). The specimens were exposed to outdoor weathering and an artificial weathering consisting of alternating soaking wood in water, drying at 70°C and UV radiation exposure. Three-step aging cycle was repeated 56 times. In general, the process of artificial weathering caused a decrease in strength of all tested wood species. A significant relation between artificial weathering (carried out in laboratory) and weathering performed in the external environment in temperate climates was found.
Drewno
The research aimed to identify two sets of charcoal found in a Hellenistic house in Risan (Monten... more The research aimed to identify two sets of charcoal found in a Hellenistic house in Risan (Montenegro) on the Kotor Gulf. The finds date from the 3rd century BC. The study included macroscopic and microscopic observations. Based on macroscopic observation and taking into account the habitat requirements and the range of particular species near Risan and the Kotor Gulf, the first set of charcoal found near a ceramic vessel was attributed to fir wood (Abies sp.), while the charcoal found in the room “with the treasure” was attributed to oak wood (Quercus sp.). The study has added to the body of evidence in favor of the effective botanical identification of charcoal from archeological finds.
Forests, 2021
Plantations have many advantages when compared to natural or semi-natural forests, such as shorte... more Plantations have many advantages when compared to natural or semi-natural forests, such as shortening production cycles, the production of wood with specific characteristics, and near-market production concentrations. The intensive development of this form of industrial wood production is practiced all over the world. The wood industry in Poland struggles in recent years, with a large shortage of wood. The deficit of wood has been accumulated for several years and is steadily increasing. One of the possibilities to change this trend can be development of fast-growing trees plantations. The main aim of this study was to determine the potential of land in Poland, which could be used for the cultivation of fast-growing trees plantations. The analyses took into account the area and marginal agricultural land. The potential plantation land areas were determined for poplar cultivar “Hybrid 275” and European larch (Larix decidua Mill.). The results show a possibility to generate a consider...
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2014
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2014
Comparison of thermal properties of selected wood species intended to woodwork windows production... more Comparison of thermal properties of selected wood species intended to woodwork windows production. The work deals with the issue of density, moisture content and thermal properties of wood: thermal conductivity, specific heat and temperature compensation coefficient. The scope of study included mostly tropical wood (bintangor, dark red meranti, framire) and as reference Scots pine). The basic attribute of wood is its density. Thermal conductivity across the fibers is strongly dependent (directly proportional) on density of wood as well as temperature compensation coefficient, but in lower extent.
Drewno, 2016
The main objective of this research was to determine the fibre saturation point of tropical wood.... more The main objective of this research was to determine the fibre saturation point of tropical wood. Two different methods were used to achieve this aim: the logarithm of strength properties versus moisture content and volumetric shrinkage-moisture content plot to zero shrinkage. The test included selected wood species from Africa: Opepe, Iroko, African padouk, and Wenge, and South America: American mahogony and Ipe. For comparison, selected domestic wood species of a similar structure – European beech (Fagus sylvatica L.) – were also tested. Determination of the fibre saturation point of the selected wood species using two methods delivered similar results (the small differences were not significant). The results showed that, generally, the fibre saturation point of the tropical wood species was lower than in the case of the European wood species. The lowest values of the fibre saturation point were shown by the African padouk and Ipe (approx. 17 %). Moreover, it was found that in the...
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology, 2014
Drvna industrija, 2021
The main objective of this work was to evaluate the effects of flat slicing processes on wood sur... more The main objective of this work was to evaluate the effects of flat slicing processes on wood surface characteristics of the European beech (Fagus sylvatica L.). The relation between wettability, roughness and machining methods were studied. Two different wood thickness (3.4 and 4.0 mm) and three levels of compression during slicing (67.5 %, 57.5 % and 47.5 % of desired veneer thickness) were used to prepare surfaces prior to testing. The smaller variation of the thickness of thinner veneers was observed. No significant impact of compression on variation of the thickness was found. The contact angle was lower when roughness measured parallel to the grain was higher. The influence of selected compression on roughness of European beech veneers measured perpendicular to the grain was confirmed. This indicated that the influence of the set of machining processes, such as pressure bar setting during slicing, is significant for wooden veneers surface properties.
Frontiers in Plant Science, 2021
Most old roses are difficult to root when propagated by cuttings. This research focused on the re... more Most old roses are difficult to root when propagated by cuttings. This research focused on the response of stem cuttings ofRosa“Hurdal” to plant origin preparations used as rhizogenesis enhancers through changes to the anatomical structure of the basal part of the stem. Cuttings derived from shoots in four phenological stages were prepared for the experiment: flower buds closed (H1); fully flowering (H2); immediately after petals have fallen (H3); 7–14 days after petals have fallen (H4). The cuttings were treated with 0.4% indole butyric acid (IBA; Ukorzeniacz Aaqua) or 0.2% naphthalene acetic acid (NAA; Ukorzeniacz Baqua), and with plant origin preparations: Algae extract (Bio Rhizotonic), Organic preparation (Root JuiceTM), and Plant extract (Bio Roots). A high rooting percentage in comparison to the control (27.5%) was obtained after treatments of the H1 cuttings with Algae extract (90%), Organic preparation (80%), and Plant extract (75%). The H4 cuttings did not root, probably a...
Maderas. Ciencia y tecnología, 2018
Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2017
The research was conducted on five once-blooming different origin historical roses. The aims were... more The research was conducted on five once-blooming different origin historical roses. The aims were establishing differences in the anatomical structure of shoots taken in four maturity stages and their natural ability to roots creating. There were hypothesized, that the changes in anatomical structure occur in the time of flowering and may affect the ability of rhizogenesis. Single node one leaf cuttings of chosen cultivars were cut from shoots in four maturity phases: flower buds closed, all flowers open, just after and 7-14 days after petal fall. The cuttings were planted in multipot trays in peat substrate without using rooting stimulators. The anatomical structure of shoots in the place of rhizogenesis were observed, the width of xylem layer and cambial zone, diameter of vascular cells were measured. The percentage of rooted cuttings and forming only a callus were counted. Adventitious roots appeared probably in the cambium zone, pith rays, and also in the zone of phloem and peri...
Heat treatment is often applied to wood to improve its properties. This study examined the effect... more Heat treatment is often applied to wood to improve its properties. This study examined the effect of heat treatment on certain mechanical properties of Scots pine (Pinus sylvestris L.), which is widely used in industry. The influence of thermal treatment on the compression strength, shear strength, modulus elasticity in bending, static bending strength, cleavage strength and Brinell hardness has been investigated. Wood was subjected to heat treatment under atmospheric pressure at varying temperatures (150, 160, 170 and 180 °C) in overheated steam. Modification of Scots pine wood affected mechanical properties of wood but observed changes (bending strength, modulus of elasticity, Brinell hardness) are not statistically significant. Only increase of compression strength along the fibers and decreased cleavage strength are clear. Optimal temperature of thermal modification ranges from 160 to 170 °C.
Forests, 2020
Scots pine (Pinus sylvestris L.) is a widespread species throughout Europe and at the same time i... more Scots pine (Pinus sylvestris L.) is a widespread species throughout Europe and at the same time is dominant in Polish forests and of key importance in the wood industry. Pine stands are subjected to numerous environmental stresses, and one of them is the different physico-chemical and biological properties of post-agricultural soils compared to forest soils, which may affect the properties of the resulting wood and its industrial suitability. The research material taken at the height of 1.3 m from tree trunks (breast height diameter, dbh) in the form of sections and discs was collected in an 80-year-old pine stand from four plots, representing former agricultural and ancient forest land, and two types of habitats: fresh coniferous forest and fresh mixed coniferous forest. The forest habitat trophy had a decisive impact on the dendrometric characteristics and properties of pine wood (density, modulus of elasticity, bending strength, and compressive strength along the tracheids). The ...
Wood research
The purpose of study was to comparison of outdoor and artificial weathering of wood using compres... more The purpose of study was to comparison of outdoor and artificial weathering of wood using compressive strength along fibers. The study involved tropical wood species from South America: garapa (Apuleia leiocarpa (Vog.) Macbride.) and angelim pedra (Hymenolobium sp.) available commercial in Europe and Scots pine (Pinus sylvestris L.) and European oak (Quercus sp.). The specimens were exposed to outdoor weathering and an artificial weathering consisting of alternating soaking wood in water, drying at 70°C and UV radiation exposure. Three-step aging cycle was repeated 56 times. In general, the process of artificial weathering caused a decrease in strength of all tested wood species. A significant relation between artificial weathering (carried out in laboratory) and weathering performed in the external environment in temperate climates was found.
Drewno
The research aimed to identify two sets of charcoal found in a Hellenistic house in Risan (Monten... more The research aimed to identify two sets of charcoal found in a Hellenistic house in Risan (Montenegro) on the Kotor Gulf. The finds date from the 3rd century BC. The study included macroscopic and microscopic observations. Based on macroscopic observation and taking into account the habitat requirements and the range of particular species near Risan and the Kotor Gulf, the first set of charcoal found near a ceramic vessel was attributed to fir wood (Abies sp.), while the charcoal found in the room “with the treasure” was attributed to oak wood (Quercus sp.). The study has added to the body of evidence in favor of the effective botanical identification of charcoal from archeological finds.
Forests, 2021
Plantations have many advantages when compared to natural or semi-natural forests, such as shorte... more Plantations have many advantages when compared to natural or semi-natural forests, such as shortening production cycles, the production of wood with specific characteristics, and near-market production concentrations. The intensive development of this form of industrial wood production is practiced all over the world. The wood industry in Poland struggles in recent years, with a large shortage of wood. The deficit of wood has been accumulated for several years and is steadily increasing. One of the possibilities to change this trend can be development of fast-growing trees plantations. The main aim of this study was to determine the potential of land in Poland, which could be used for the cultivation of fast-growing trees plantations. The analyses took into account the area and marginal agricultural land. The potential plantation land areas were determined for poplar cultivar “Hybrid 275” and European larch (Larix decidua Mill.). The results show a possibility to generate a consider...