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    Wyświetlanie 1-7 z 7
    Tytuł:
    Zastosowanie programowania liniowego do optymalizacji zrywki drewna w trzebieżach
    Application of the linear programming to optimizing wood extraction in thinnings
    Autorzy:
    Jabłoński, K.
    Stempski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/989674.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    trzebieze
    zrywka drewna
    skladnice drewna
    lokalizacja
    optymalizacja
    programowanie liniowe
    linear programming
    simplex algorithm
    wood extraction
    Opis:
    Improvement cuttings conducted simultaneously on a few closely located areas, often face problems about how to prepare places that would serve as temporary landings for the harvested wood. This results from insufficient wood storing space in the forest and limited accessibility of the road network to wood hauling trucks, and leads to solutions, suggesting where small landings at tree−stand edge must be established, often in places rather distant form the thinning plots. When the wood is harvested on several thinning plots and should be transported to several small landings, a problem appears, where (i.e. to which landing) should the wood from a particular thinning plot be sent. The paper presents a model to solve this problem using the simplex algorithm, which is used in linear programming, a method applied in operations research. The wood was sourced from 15 thinning plots and 11 wood landings were located. In the model, the objective function presented total transportation work, to be spent on the wood extraction. The objective function was minimized. The problem was set up on the Excel spreadsheet and then resolved with the solver application. The model enabled to direct the harvested wood from different thinning plots to different landings in an optimal way. The results enabled to design the optimal wood extraction routes and to determine the allowable changes in the amounts of wood harvested from each thinning plot, which would not change the optimal solution. The model enabled also to calculate the minimum amount of transportation work, which would be spent during the optimized transportation of wood form particular thinning plots to particular wood landings.
    Źródło:
    Sylwan; 2016, 160, 01; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pakietowanie pozostałości zrębowych nowym sposobem wykorzystania biomasy leśnej do celów energetycznych
    Bundling of logging residues - a new method to use biomass for energy purposes
    Autorzy:
    Chlebowski, K.
    Jabłoński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1006454.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    surowce energetyczne
    biomasa lesna
    pozostalosci zrebowe
    pakietowanie
    energy wood
    logging residues
    wood harvesting
    slash bundler
    Opis:
    Woody fuels are perceived as an important potential renewable source of energy in Poland. With about 25 thousand ha of clear−cut every year, it is possible to collect over million tons of woody fuels in form of logging residues, which is usually left behind after timber and industrial wood have been taken away. The technology using slash bundlers for bundling logging residues is an interesting option to produce a woody fuel ready for burning. Logging residues bundles differ in their dimensions and weight depending on the bundling machine used for the operation. As the technology utilises green branches and tree tops for producing bundles, it may lead to losses in the amount of certain chemical elements in the forest site thus negatively affecting the future forest generations. The complexity of the problem calls for intensive research into the problem of using logging residues as a source of energy.
    Źródło:
    Sylwan; 2012, 156, 04; 315-320
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja zrywki drewna według kryterium minimalizacji pracy transportowej
    Optimization of wood extraction from a clear-cut area according to the minimum transportation labour criterion
    Autorzy:
    Jabłoński, K.
    Stempski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/989792.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    zrywka drewna
    optymalizacja
    prace transportowe
    minimalizacja
    programowanie liniowe
    wood extraction
    linear programming
    transportation labour
    Opis:
    The objective of the study was to optimize wood extraction from a clear−cut area to several upper landings located at roads suited for wood haulage in a situation where the room for storing the wood was limited. The optimization process was to divide the clear−cut area into zones, from which the wood assortments should be transported to the different landings, so that the total transportation labour would be minimized. The research was conducted in Oborniki Forest District (western Poland) on a clear−cut area where the harvest of 2027 m³ of wood in four assortments was planned. The optimization method used presented a linear programming problem, which was formulated and solved with the Solver tool, available with a common spreadsheet. The clear−cut area was divided into a number of elementary plots, for which the quantities of the wood to be extracted and distances to the specified landings were determined. Altogether 189 such plots were defined, mostly square in shape and with 20 m long side. Three upper landings for each wood assortment, located at roads accessible to long−distance vehicles were also determined (fig. 1). The minimization of the transport labour needed for the extraction of different wood assortments was set as the criterion for the objective function. The results of the calculations, after putting them on the forest clear−cut area map (fig. 2), provided information about parts of the clear−cut area to which the wood should be extracted to. As it was expected, in the majority of cases, the model directed the wood to the landings, which were the closest, but in case of one assortment, the wood was directed to the landing located a bit further away than to the closest one. The model enabled to minimize the transportation labour spent on wood extraction from the clear−cut area. The calculations did not require any specific applications, enabling users of commonly available spreadsheets, equipped with a Solver tool to perform such calculations.
    Źródło:
    Sylwan; 2015, 159, 07; 540-548
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przydatność dębowych zrębków z całych drzew do przerobu na płyty pilśniowe twarde
    Usefulness of oak chips of whole trees for conversion into hartboards
    Autorzy:
    Gornowicz, R.
    Jablonski, K.
    Rozanski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/813130.pdf
    Data publikacji:
    1991
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany debowe
    dab
    zrebki drzewne
    zrebki debowe
    wykorzystanie
    przydatnosc technologiczna
    plyty pilsniowe twarde
    Źródło:
    Sylwan; 1991, 135, 11
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena możliwości rekompensaty miąższości drzew usuniętych ze szlaków zrywkowych zwiększonym przyrostem drzew granicznych
    Assessing the possibility for the compensation of the volume of trees removed from the strip-roads by the increased increment of the edge trees
    Autorzy:
    Stempski, W.
    Jabłoński, K.
    Jakubowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/974053.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    szlaki zrywkowe
    straty
    rekompensata strat
    drzewa graniczne
    przyrost drzew
    leśnictwo
    drzewa usunięte ze szlaku
    miąższość drzew
    opening−up of stands
    loss
    increment from increased light influx
    Opis:
    The purpose of the research was to assess the possibility to compensate for the volume and its 10−year increase lost on future crop and trainer trees removed from the strip−roads by the increased growth of trees at their edge. The assessment comprised the estimation of the compensation period length and its percentage value 10 years after cutting the strip−roads. The analysis also comprised 5−year−long wood volume growth periods. The research was conducted in Scots pine stand, located in the eastern part in the Notecka Forest, the area managed by the Oborniki Forest District (western Poland). The strip−roads 2.5 m and 3.5 m of width were cut every 30 m in the 31−years−old stand. The measurements covered trees growing directly at the strip−roads as well as 2−4 m and 8−10 m away from them. The volume increase was calculated on the basis of tree− ring widths, on the cross−sections cut from the mid−points of 2−meter−long sections. The simulation of the possibility to compensate for the volume loss on future crop and trainer trees removed from strip−roads was conducted by calculating the difference of the average annual volume increments in a 10−year−long period for single trees from the 0−1 and 8−10 m zones, and for the sum of differences in annual increments between these zones as well as between the 2−4 m and 8−10 m zones. The results showed that the trees growing directly at the strip−roads had the largest periodic volume increments, and in case of the wider strip−roads the largest volume increments were also found on trees growing in the 2−4 m zone away from the strip−road. Simulations of the volume loss compensation period length and of 10−year volume increment showed that the compensation was possible in the variants with the wider strip−roads. 10 years after cutting the strip−roads, the compensation for the volume loss and for the lost 10−year volume increment, resulting from the increased increment on trees form the 0−1 m and 2−4 m, was 30% and 14%, in tree stands with wider and narrower strip−roads respectively.
    Źródło:
    Sylwan; 2020, 164, 01; 16-24
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detekcja fitopatogenów z rodzaju Phytophthora w glebach leśnych za pomocą analiz DNA
    Detection of Phytophthora in forest soils using DNA analysis
    Autorzy:
    Kubiak, K.A.
    Oszako, T.
    Jabłoński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/996874.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    gleby lesne
    czynniki chorobotworcze
    mikroorganizmy glebowe
    Phytophthora
    identyfikacja
    analiza DNA
    metoda nested-PCR
    phytophthora
    identyfication
    dna isolation
    forest soil
    pcr
    Opis:
    Pathogenic oomycetes from the genus Phytophthora attack the base trunks and root systems of trees causing their illness and dying. Under favorable conditions, they may cause damage to even 90% of fine roots. For this reason, they are a particular threat to seedlings in nurseries of forest trees and ornamental plants. Early detection and identification of Phytophthora species is a key issue in forest protection. The aim of this study was to compare the two methods of identification of pathogenic Phytophthora in soil samples collected around 50 selected oaks in Krotoszyn and Karczma Borowa forest districts. Each of the soil samples were analyzed in parallel: 1) direct isolation of genomic DNA from soil and 2) isolation of genomic DNA from soil, preceded by its three day pre−incubation in a selective medium for Phytophthora. Species identification was performed by PCR amplification with primers specific for the species of Phytophthora. The results indicate that the use of pre−incubation phase of soil in a medium−PARP PeaBroth before isolation of DNA, increases the sensitivity of detection of these phytopathogens using PCR. With pre−incubation, the method revealed 54% of positive findings, while simultaneously conducted the same analysis of soil samples by using only direct DNA isolation from soil and PCR amplification provided only 30% of positive findings.
    Źródło:
    Sylwan; 2012, 156, 06; 437-443
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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