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1

Birch plywood composite material with hemp fibre reinforcement

100%
Upitis G., Dolacis J.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2012
|
tom 80
2

Relationship between the anatomical structure elements and mechanical properties in the trunk transverse and longitudinal direction for wood of Norway spruce (Picea abies (L.) Karst.) growing in Latvia

81%
Dolacis J., Antons A., Pavlovics G., Cirule D.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2010
|
tom 71
3

New method for drying loose wood in the fluidized layer created by the pneumoimpulse method

81%
Engelbrehts A., Gerdt O., Dolacis J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2004
|
tom 55
For the first time, a new method for drying biomass loose matrials, including loose wood in the fluidized layer with a pneumoimpulse input of energy in the dynamic regime is described. A comparative analysis of the energy consumption of heat energy per kg of evaporated moisture upon the drying of loose wood is presented, in comparison with other intensive methods of drying such as the fluidized-bed layer and suspension dryer using high-temperature flue gases. It is shown that the suggested method of drying is efficient both at relatively low temperatures of treatment (e.g. at normal room temperatures of industrial premises) and elevated temperatures of the heat carrier, i.e. up to + 60 + +110°C. The total costs of electric and heat energy per kg of evaporated moisture of the suggested pneumoimpulse method of drying are lower by about 30-40% than for suspension dryers and fluidized-bed layer dryers. The efficiency of the new method of drying grain and foodstuffs, e.g. carrot, brewer's malt, etc. is shown.
4

Investigation of the quality of blanks of wooden pallets

81%
Spulle U., Pusinskis V., Hrols J., Dolacis J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2005
|
tom 57
The mechanical and quality properties of palettes prepared from spruce (Picea abies L. Karst.) wood (with and without knots), pine (Pinus sylvestris L.) wood (with and without knots), alder (Alnus incana L. Moench) wood (with and without knots) and aspen (Populus tremula L.) wood (with and without knots) were assessed. It has been found that, in the case of pine wood, the first quality class and defects comprise 73.4% and 18.2%, respectively, of the preparation. For spruce wood, the first quality class and defects comprise 67.4% and 12%, respectively, of the preparation. For alder wood, the first quality class and defects are 62.5% and 22.9%, respectively, of the preparation. For aspen wood, the first quality class and defects comprise 67% and 20.8%, respectively, of the preparation. In the case of pine wood (without knots), mechanical strength and modulus of elasticity are higher than in the case of spruce wood (without knots), namely, bending strength is higher by 8.5% on the average, while modulus of elasticity is higher by 8.3%. In the case of pine wood (with knots), bending strength is by 4.5% lower than for spruce wood (with knots), while modulus of elasticity is higher by 8.5%. In the case of alder wood (without knots), mechanical strength and modulus of elasticity are lower than for aspen wood (without knots), namely, bending strength is 17.5%, and modulus of elasticity is 14.2% on the average. In the case of alder wood (with knots), bending strength is higher than tor aspen wood (with knots), namely, by 22.6% on the average, and modulus of elasticity is higher, namely by 36%.
5

Physico-technical characteristics of firewood

81%
Dolacis J., Tomsons E., Hrols J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2005
|
tom 56
6

Dependence of the wood heat value on moisture content

81%
Tomsons E., Tuherm H., Dolacis J., Hrols J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2003
|
tom 53
7

Relationship between the anatomical structure elements and physical properties in the trunk transverse and longitudinal direction for wood of Norway spruce (Picea abies (L.) Karst.) growing in Latvia

81%
Pavlovics G., Dolacis J., Antons A., Cirule D.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2010
|
tom 72
8

Some physical and mechanical properties of wild cherry (Prunus avium L.) wood growing in Latvia

81%
Dolacis J., Daugaviete M., Tuherm H., Hrols J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2003
|
tom 53
9

Chislennyjj i ehksperimental'nyjj analiz fizicheskikh processov pri sushke dispersnogo kapilljarno-poristogo materiala pul'sirujushhim vozdushnym potokom

71%
Dolacis J., Ushakov V., Savicka K., Sidenko N., Ehgelbrekht A.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2005
|
tom 56
10

Anatomicheskoe stroenie i nekotorye fiziko-mekhanicheskie kharakteristiki drevesiny sosny (Pinus sylvestris L.), proizrastajushhejj v Latvii i Estonii

71%
Pikk J., Alksne A., Khrol J., Tukherm K., Dolacis J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2003
|
tom 53
11

Some physical and mechanical properties of birch (Betula pendula Roth.) wood growing in Latvia

71%
Pushinskis V., Mionchinskis U., Tuherm H., Hrols J., Dolacis J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2003
|
tom 53
12

Some morphological and physical characteristics of wild cherry wood growing in Latvia

71%
Dolacis J., Daugaviete M., Alksne A., Hrols J., Pavlovics G.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2004
|
tom 55
The present work summarizes the literature data on both the fast growing species of wild cherry or crab cherry (Cerasus avium L.) Moench syn. Prunus avium L.), and the cultivation of wood in plantations as well as the basic physico-mechanical characteristics of this species' wood. Wild cherry wood is valued high on the world's market owing to its technological and mechanical properties: elasticity, not too high hardness, easy processability, good polishing characteristics, easy mordanting and lacquering, similar mechanical properties of both the heartwood and sapwood parts of the stem. Besides, the wood has an expressive and interesting structure, owing to which it is widely used for the production of furniture, plywood, decorative face veneer, wooden floorings, parquet, souvenirs, sports articles, caskets, domestic goods, etc. Data on the results of wild cherry stands inventory in the Kurzeme and Zemgale regions of Latvia with the aim of selecting promising taxons are summarized. Data on the growth of seedlings in plantations of 1997 it the Liepaja, Kuldiga and Gulbene regions of Latvia are summarized. The studies testify that the cultivation of wild cherry for obtaining decorative wood in plantations of the southern, south-western and middle regions of Latvia is promising. Physico-mechanical characteristics for both the heartwood and sapwood parts of the stem are presented, which show that the strength characteristics of the heartwood part of the stem are higher than in the case of sapwood.
13

Numerical and experimantal analysis of physical process at drying disperse capillary-porous materials by the pulsing air stream

71%
Dolacis J., Ushakov V., Savicka K., Sidenko N., Engelbrehts A.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2005
|
tom 57
On the basis of the results of natural experiments and numerical calculations on computer models, physical peculiarities of drying of biomass loose materials (loose wood, peat granules, etc.) are analysed in a fluidized bed with low-frequency pulsing input of the drying agent (air). A computer stand is developed for numerical experiments on the basis of modern CAD/CAE programs, allowing to model the geometry of the drying unit, the dynamics of its mobile mechanical elements, the parameters of the gas-dynamic stream with recurrent pulses of the charge and pressure, the operating characteristic of the centrifugal blower depending on the geometry of the blading and the resistance of the gas-dynamic section. Characteristic features of the pulsing wavy stream created by a pulsator are investigated; the forms of pulses of pressure, speed and density in all sections of the drying unit are determined. The results of numerical calculations are confirmed by the data of natural experiments.
14

Combustion heat of pinewood depending on moisture

71%
Tomsons E., Dolacis J., Hrols J., Turlajs D., Lalik V.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2004
|
tom 55
Wood as a fuel is an environmentally friendly energy resource. In the future, wood as a Latvian local fuel should be regarded as one of economically attractive energy resources owing to the dramatic decrease in the imported fossil fuel (oil and natural gas). At present, from the volume of wood felled in Latvia, 3.2-3.5 million m3 is used per year as a fuel wood. From the volume of felled wood, pine comprises 30.1%. Wood is used for heating in the form of firewood, chips, briquettes, pellets, shavings, etc. at different moisture contents. The paper presents rated density, as well as the amounts of combustion mass and volume (lowest and highest) heat depending on the wood moisture content.
15

Comparison of soil treatment methods in sludge-fertilized energy wood plantations in former agricultural soils

71%
Kaposts V., Lazdina D., Karnisch Z., Hrols J., Dolacis J.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2005
|
tom 56
16

Dependence of the optical properties on moisture content for birch (Betula pendula Roth.) wood at the variable temperature and constant time of hydrothermal treatment

71%
Dolacis J., Hrols J., Tuherm H., Skuditis J., Ziverts A.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2003
|
tom 53
17

Radiomonitoring of Ignalina NPP neighbouring forest pine and spruce wood

71%
Hrols J., Skujina A., Dolacis J., Armolaitis K., Blaho J.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2008
|
tom 65
18

Analytical calculation of spectral optical and thermoradiation charakteristics of the plane layer of wood

71%
Dolacis J., Iljasov S., Hrols J., Pavlovics G., Antons A.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2007
|
tom 61
19

Dependence of the optical properties of birch wood on moisture content at the constant temperature of hydrothermal treatment and time

61%
Dolacis J., Hrols J., Skuditis J., Ziverts A., Ktutul D., Kazem-Bek D.
Annals of Warsaw Agricultural University. Forestry and Wood Technology
|
2004
|
tom 55
The exploration of the sales market of furniture and other domestic goods both from solid wood and veneer shows that consumers currently prefer articles from wood with a definite brightness, i.e. lighter hues. This factor is of great importance for veneer production as well as the manufacture of wood boards, with their subsequent veneering. To investigate the possibilities to increase brightness, it is of interest to study the optical properties (mainly reflection capacity L*) of wood in the visible range of the electromagnetic spectrum, depending on the regimes of its hydrothermal treatment, i.e. water temperature and steam treatment time. It has been shown that hydrothermal treatment influences the brightness of Silver birch (Betula pendula Roth.).
20

Wood formation character and physical properties of hybrid aspen (Populus tremuloides x tremula) cultivated in Latvia

61%
Cirule D., Alksne A., Lavinikovica I., Antons A., Dolacis J., Pavlovics G.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2009
|
tom 68
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