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Wyświetlanie 1-12 z 12
Tytuł:
Efektywność łuszczenia szyszek sosny zwyczajnej w warunkach produkcyjnych
Effectiveness of Scots pine seed extraction at industrial scale
Autorzy:
Aniszewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1015782.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
szyszki
luski otwarte
lesnictwo
luszczenie
lasy gospodarcze
Pinus sylvestris
liczebnosc
efektywnosc
nasiona
sosna zwyczajna
zywotnosc nasion
czas otwarcia szyszek
drzewa lesne
cone
scots pine
extraction process
Opis:
In the paper the author compares the results of laboratory tests of the extraction process of whole cones and of those after processing (shortened) with the tests made in the production−scale seed extraction plant in Czarna Białostocka. The author suggests elevating extraction temperature and shortening the time of keeping cones in extraction chambers. She puts into doubts the rightfulness of cone shortening, as the quantity of seeds obtained from them is lower than the quantity obtained from the whole cones.
Źródło:
Sylwan; 2007, 151, 09; 22-28
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka wielofazowego procesu wyluszczania nasion modrzewia europejskiego Larix decidua Mill. na przykladzie wyluszczarni gospodarczej w Czarnej Bialostockiej
Multiphase process of European larch Larix decidua Mill. seed extraction : a case of Czarna Bialostocka
Autorzy:
Aniszewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/45365.pdf
Data publikacji:
2008
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
szyszki
Larix decidua
wyluszczanie wielofazowe
lesnictwo
wyluszczanie nasion
Wyluszczarnia Nasion Czarna Bialostocka
modrzew europejski
Źródło:
Leśne Prace Badawcze; 2008, 69, 2; 155-163
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiana masy i temperatury powierzchni szyszek sosny zwyczajnej (Pinus sylvestris L.) pod wpływem promieniowania mikrofalowego
The change in weight and surface temperature of pine cones (Pinus sylvestris L.) as a result of microwave irradiation
Autorzy:
Aniszewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/46431.pdf
Data publikacji:
2016
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
sosna zwyczajna
Pinus sylvestris
szyszki sosny
promieniowanie mikrofalowe
temperatura powierzchni
zmiany temperatury
masa szyszek
zmiany masy
Źródło:
Leśne Prace Badawcze; 2016, 77, 1
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza dwuetapowego luszczenia ze zraszaniem woda szyszek sosny zwyczajnej Pinus sylvestris L.
Analysis of two-stage extraction of Pinus sylvestris L. seeds
Autorzy:
Aniszewska, M.
Jaworski, S.
Powiązania:
https://bibliotekanauki.pl/articles/45437.pdf
Data publikacji:
2009
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
sosna zwyczajna
Pinus sylvestris
szyszki
wyluszczanie nasion
wyluszczanie dwuetapowe ze zraszaniem
wilgotnosc
zmiany wilgotnosci
szybkosc suszenia
wskaznik otwarcia szyszek
liczba pozyskanych nasion
wyluszczarnie nasion
Wyluszczarnia Nasion Jarocin
Źródło:
Leśne Prace Badawcze; 2009, 70, 4; 329-338
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność szyszek jodły pospolitej (Abies alba Mill.) - zmienność parametrów zewnętrznych szyszek
Variability of silver fir (Abies alba Mill.) cones - variability of cone parameters
Autorzy:
Aniszewska, M.
Bluszkowska, U.
Powiązania:
https://bibliotekanauki.pl/articles/1294728.pdf
Data publikacji:
2016
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
szyszki
ksztalt
parametry zewnetrzne
modele geometryczne
cone
scales
area
volume
shape
Opis:
This study aimed at determining the shape of closed silver fir cones from the Jawor Forest District (Wroclaw), based purely on measurements of their length and thickness. Using these two parameters, the most accurate estimations were achieved with a fourth-degree polynomial fitting function. We then calculated the cones’ surface area and volume in three different ways: 1) Using the fourth-degree polynomial shape estimation, 2) Introducing indicators of compliance (k1, k2, k3) to calculate the volumeand then comparing it to its actual value as measured in a pitcher filled with water, 3) Comparing the surface area of the cones as calculated with the polynomial function to the value obtained from ratios of indicators of compliance (ratios k4 and k5).We found that the calculated surface area and volume were substantially higher than the corresponding measured values. Test values of cone volume and surface area as calculated by our model were 8% and 5% lower, respectively, compared to direct measurements. We also determined the fir cones apparent density to be 0.8 g·cm-3on average. The gathered data on cone surface area, volume and bulk density is a valuable tool for optimizing the thermal peeling process in mill cabinets to acquire high quality seeds.
Źródło:
Leśne Prace Badawcze; 2016, 77, 3
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie ciepła spalania i wartości opałowej szyszek wybranych gatunków drzew leśnych
Comparison of heat of combustion and calorific value of the cones and wood of selected forest tree species
Autorzy:
Aniszewska, M.
Gendek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1312894.pdf
Data publikacji:
2014
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
biomasa
szyszki
cieplo spalania
wartosc opalowa
drzewa lesne
sosna zwyczajna
Pinus sylvestris
swierk pospolity
Picea abies
modrzew europejski
Larix decidua
jodla pospolita
Abies alba
cone
wood
biomass
heat of combustion
calorific value
Opis:
Every year, scaling plants buy (up to tens of tons) cones which needs to be peeled. After the process of scaling, the cones themselves are waste, which is partly sold. The problem of waste disposal is especially severe in plants where the processing is performed by electrically-powered scaling cabinets, but the problem does not apply to facilities where pellets are burned to produce heat. We examined the heat of combustion and calorific value of the residues from scaling plants that can be used in the production of refined wood fuels. The residues consist of the empty cones of pine, spruce, larch as well as husks and stems of silver fir. Additionally, we conducted measurements of the heat of combustion for wood and cones of each species and compared them to their respective calorific values The results revealed that the average calorific value of the cones is in the range 17.81–19.86 MJ/kg. Our work showed that empty cones have a significantly higher calorific value and heat of combustion than the wood of spruce, larch and fir. In the case of pine, cones and wood did not differ significantly. These results led us to the conclusions that empty de-scaled cones can be utilized as a valuable primary solid fuel or fuel additive for the production of refined products for the local market. Due to the low annual production of cones in comparison to other materials such as sawdust and wood chips, pine cones should be used as a supplement, to enrich fuels of inferior quality by enhancing their energetic properties.
Źródło:
Leśne Prace Badawcze; 2014, 75, 3; 231-236
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane cechy szyszek jodły pospolitej Abies alba Mill. w aspekcie procesu wyłuszczania i jakości nasion
Selected traits of Silver fir Abies alba Mill. cones in the context of the extraction process and seed quality
Autorzy:
Aniszewska, M.
Brzozko, J.
Zychowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/45428.pdf
Data publikacji:
2018
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
szyszki
trzpien szyszki
wielkosc szyszek
zawartosc wody
wyluszczanie nasion
jakosc nasion
Źródło:
Leśne Prace Badawcze; 2018, 79, 2
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność budowy szyszek i powierzchni łusek nasiennych modrzewia europejskiego (Larix decidua Mill.)
Variability of cones and scale surface area of European larch (Larix decidua Mill.)
Autorzy:
Aniszewska, M.
Stadnik, S.
Gendek, A.
Powiązania:
https://bibliotekanauki.pl/articles/46195.pdf
Data publikacji:
2017
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
modrzew europejski
Larix decidua
szyszki
budowa morfologiczna
luski nasienne
zmiennosc
Opis:
The article describes the shape of cones of European larch (Larix decidua Mill.) using the fourth-degree polynomial fitting function. The material was derived from the seed orchard of the Barycz Forest District. The curves were used to calculate the area and volume of single cones. It was not possible to generalize the formulas to calculate the surface and volume of larch cones using the described method, due to the large variability of the empirical coefficients of equations. Finally, to calculate the area and volume of cones, the formula to determine the solid figure of cone was used. The constant αs of 0.43 was introduced to the formula. Calculated volume values were compared to actual volumes measured by a water-filled burette. The mean surface area of larch cones was calculated from the forming function and it was 780 mm2 and the volume was 2434 mm3.Values calculated from cone formulas after taking into account the αs and constants (0.68 and 0.53) were 783 mm2 and 2415 mm3, respectively. The outer and inner surfaces of the seed scales coming from the central part of the larch cones were photographed using Quanta 200 scanning microscope. Specific features of the scales were measured using the Multi Scan Base program. It was found that the outer and inner surfaces of the larch scales, such as pine and fir, were different. On the outer side, scales are formed by thick-walled cells with visible protruding trichomes. And on the inside at the location of the wings and seeds are visible thin-walled cells with jagged cell walls. On the surface of the scales, the appearance of long stem cells, resembling threads, that are absent on pine and fir seed scales was observed.
Źródło:
Leśne Prace Badawcze; 2017, 78, 3
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność szyszek jodły pospolitej (Abies alba Mill.) – zróżnicowanie budowy powierzchni łusek nasiennych
Variability of silver fir (Abies alba Mill.) cones – variability of scale surface area
Autorzy:
Aniszewska, M.
Gendek, A.
Śliwińska, J.
Powiązania:
https://bibliotekanauki.pl/articles/1293578.pdf
Data publikacji:
2017
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
szyszki
luski nasienne
zmiennosc
pole powierzchni
powierzchnia parowania
mikroskop elektronowy skaningowy
cone
scale
area of evaporation
scanning electron microscope
Opis:
This study was conducted on a batch of closed silver fir cones from Jawor Forest District and a mixture of scales from the seed extraction facility Grotniki. The scales were divided into three size classes corresponding to the bottom, middle and upper part of the cones and their area was measured with the Multi Scan Base v.18.03 software. Based on the sum of the inner and outer surface area of all scales, we then determined the total area of evaporation from the cones. In addition, the area of protruding scales was measured for differently sized scales from different parts of the cones. Previous studies have shown that the average outer surface of a closed cone, calculated as the sum of protruding scales, accounts for 10% of the outer surface of an open cone. Pictures of both scale surfaces with the internal seed bed and the external protrusions were taken using a scanning electron microscope. We noticed significant differences in dimension and shape of the channels and trichomes on the scale surface. On the inner side of the scales, we found a high diversity of trichomes of different lengths, whilst the outer side contained channels. Presumably, these characteristics affect the rate of water loss from the cones during desiccation and separation of the seed. In-depth knowledge on the evaporative surfaces of fir cones and scale structure will be helpful for optimizing the industrial processes of seed extraction.
Źródło:
Leśne Prace Badawcze; 2017, 78, 1
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan wyszkolenia i wyposażenie operatorów pilarek spalinowych zatrudnionych przy pozyskaniu drewna w polskich lasach
State of training and equipment of chainsaw operators employed for timber harvesting in Polish forests
Autorzy:
Gendek, A.
Aniszewska, M.
Nurek, T.
Moskalik, T.
Powiązania:
https://bibliotekanauki.pl/articles/985831.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
pozyskiwanie drewna
operatorzy pilarek spalinowych
bezpieczenstwo pracy
ochrona zdrowia
srodki ochrony osobistej
wyposazenie dodatkowe
szkolenie zawodowe
badania ankietowe
occupational safety
chainsaw operator
vocational training course
personal protective equipment
Opis:
One of the most important factors influencing work performance of chainsaw operators, considered as one of the most dangerous, is acquirement of knowledge in a training course enabling to obtain vocational qualifications as a logger and to gain experience in timber harvesting operations. Securing the safety of the chainsaw operator is realized on two levels. Firstly, by organizing appropriate training courses, and secondly, by providing employees with appropriate personal protective equipment. The research was carried out in 15 forest districts in different parts of Poland. The survey conducted on a group of over 200 loggers was aimed at identifying the most important factors affecting health and safety of work in forestry. According to the obtained results, a large group of chainsaw operators completed only a 2−3−day−long training courses, during which they could not get sufficient knowledge how to operate with the chainsaw. The lack of knowledge has a direct impact on the fact that 57% of the respondents use the chainsaw for its extreme wear, 41% of the loggers do not prepare the work place before tree felling and do not debark the stump. 40% of these workers do not set the chain brake, while starting the chainsaw engine. 41% of loggers do not work with an assistant in young stands. The consequences of such negligence are injuries. 76% of them are not reported as accidents at work.
Źródło:
Sylwan; 2018, 162, 02; 118-126
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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