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Wyszukujesz frazę "energy harvesting" wg kryterium: Wszystkie pola

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    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:
    Wpływ pozycji roboczej podczas ścinki drzew na wydatek energetyczny operatora pilarki
    Influence of working posture during the felling on energy expenditure of a chainsaw operator
    Autorzy:
    Grzywiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/989764.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    scinka drzew
    drwale
    pilarze
    pozycja ciala
    wydatek energetyczny
    working posture
    energy expenditure
    timber harvesting
    feller
    chainsaw
    Opis:
    Holding determined body postures during work is connected with energy expenditure. The more forced the posture is, the more muscles take active part in holding and stabilizing the working posture. In forest operations the most share of awkward (forced) working postures occur during the tree felling with a chainsaw. It is also one of the hardest activities in motor−manual timber harvesting process. The group of 10 experienced fellers in the age of 47.5±7.3 years was studied. The research was carried out on four Scots pine clear−cuts in western Poland, in spring and autumn without snow cover. The average air temperature was 7.1±4.8°C, and humidity amounted to 72±6.7%. In the simulation study the fellers cut thin wood slices from 30 cm stumps. The stumps were located close to each other in order to minimize the influence of passes from one to another. The diameter of stumps was selected so that it wouldn't exceed the effective length of the chainsaw bar. The felling was carried out with the chainsaw Stihl MS 361 with the power of 3.4 kW and weight of 7.5 kg. Net energy expenditure (NEE) was determined using the pulmonary ventilation measurement (MWE−1 meter) during simulation of felling in 4 working postures (fig.). The lowest energy expenditure was observed for kneeling down on one knee and squatting: 16.4 and 16.9 kJ/min, respectively. Standing bent forward working postures feature statistically higher energy expenditure, reaching 19.9 kJ/min with straight legs and 22.1 kJ/min with bent legs (p<0.05). The realized research confirmed that body posture during felling with a chainsaw influences the level of the feller's physical workload. Standing bent postures cause energy consumption which is higher than during squatting and kneeling on one knee. The most preferred working posture, from the point of view of energy expenditure and biomechanical workload during felling, is standing bent posture with straight legs. The other postures, especially squatting, can be used regularly for a short time in order to unburden a lumbar part of spine. Applying working postures that require less energy during felling with the chainsaw may contribute to reducing the work heaviness on the feller's workstation.
    Źródło:
    Sylwan; 2015, 159, 10; 824-830
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bilans energetyczny oraz czasochłonność wybranych elementów w łańcuchu technologicznym pozyskiwania biomasy leśnej
    Energy balance and time-consumption of selected components in technological chain of forest biomass harvesting
    Autorzy:
    Gałęzia, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/991700.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    biomasa lesna
    zrebki drzewne
    pozyskiwanie biomasy
    transport
    lancuch technologiczny
    bilans energetyczny
    czasochlonnosc
    forest biomass
    chips
    energy
    Opis:
    The purpose of the research performed in the Augustowska Primeval Forest (NE Poland) was to estimate the energy spent on preparation and transportation of energetic biomass in form of chips made of final felling residues and comparing it with an energetic output received at the power plant in nearby Białystok. Data was collected in form of working's day activity study on 18 clear−cut areas during 67 hours of research. Research proved that currently used methods of harvesting, processing and transportation of forest biomass in form of chips are highly efficient from point of view of energy balance. However, this efficiency can even be raised by localizing of felling sites closer to the power plant. In such case, energy spent on chipping would probably be the most significant input.
    Źródło:
    Sylwan; 2013, 157, 06; 419-424
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie monitora pracy serca do oceny efektywnego wydatku energetycznego w ręczno-maszynowych technologiach pozyskiwania drewna
    Use of heart rate monitor in assessing the net energy expenditure during motor-manual cutting
    Autorzy:
    Leszczyński, K.
    Stańczykiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/990022.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    robotnicy lesni
    operatorzy pilarek spalinowych
    fizjologia pracy
    tempo metabolizmu
    wydatek energetyczny
    czestosc skurczow serca
    energy expenditure
    chainsaw operator
    timber harvesting
    metabolism rate
    late thinning
    Opis:
    Energy expenditure during labour constitutes one of the criteria used for assessing the laboriousness of timber harvesting. The major objective of this study was to point out the possibilities of defining work net energy expenditure (NEE) as related to the frequency of heart rate in the field exercise tests by changing posture and varied external work load. The scope of the study was restricted to the work of chainsaw operators performing hard physical labour during late thinning of fir and spruce on the middle mountain (Beskid Makowski, Beskid Śląski). The research involved dynamic work with elements of static load for which the NEE was investigated by means of heart rate as well as respiratory – indirect estimation of oxygen consumption as results of airflow measurement. The advantage of both methods is simplicity of application, the lack of necessity to perform additional analyses as time study and expected medium error. The conducted calculations pointed out to a strong linear correlation, where correlative coefficient was equal to 0.67. The conducted model analysis (including, among others: the normality, autocorrelation of residuals and identification of influential values) has confirmed its validity at the 10% statistical error. The obtained regression coefficient indicates a larger increase in value as compared to the available formulas with acceptable in practice standard error of prediction on 6.05 kJ/min level.
    Źródło:
    Sylwan; 2014, 158, 02; 124-131
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wydajność i energochłonność procesów technologicznych pozyskiwania drewna w Lasach Państwowych
    Proizvoditel'nost' i ehnergojomkost' tekhnologicheskikh processov zagotovki drevesiny v Gosudarstvennykh lesakh
    Efficiency and energy consumption of technological processes of wood harvesting in State Forests
    Autorzy:
    Dzialuk, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1178306.pdf
    Data publikacji:
    1988
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    pozyskiwanie drewna
    technologia pozyskiwania
    procesy technologiczne
    wydajnosc pracy
    energochlonnosc
    mechanizacja prac lesnych
    Źródło:
    Sylwan; 1988, 132, 02
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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