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Wyświetlanie 1-10 z 34
Tytuł:
Użytkowanie lasów w Indonezji
Forest utilization in Indonesia
Autorzy:
Sieniawski, W.
Powiązania:
https://bibliotekanauki.pl/articles/973913.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Indonezja
lasy
leśnictwo
użytkowanie lasu
gospodarka leśna
forest utilization
indonesia
forest utilization concession
Opis:
Covering 133.7 mln ha of area, forests of Indonesia are an important part of world’s forest resources. In terms of size, they are one of the largest rainforest in the world. So far, 5014 tree species has been classified there. The dominant species include Shorea sp., Litsea sp., Dipterocarpus sp., Calophyllum sp., Eugenia spp., Payena sp., Vaticano sp. and Palaquium sp. Forest utilization model is based on the concessions, allowing for the commercial exploitation of forest resources. Since independence in 1945, forest utilization policy has changed many times. Not only administration was changing, but also the level of administrative authority, where the major decisions for forest policy were undertaken. All these changes significantly imprinted on the current situation in Indonesian forestry and lifestyle of people dependent on forests.
Źródło:
Sylwan; 2011, 155, 04; 279-288
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wydajności zrywki drewna w drzewostanach bukowych
The efficiency analysis of skidding and forwarding in beech stands
Autorzy:
Sieniawski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1009738.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany bukowe
zrywka drewna
wydajnosc pracy
lesnictwo
pozyskiwanie drewna
beech
efficiency
harvesting
skidding
forwarding
Opis:
The purpose of research was to analyse the efficiency of skidding and forwarding as well as relationships between these stages in beech stand. The large−sized wood was dragged by LKT 120 skidder, while middle−sized wood was loaded on trailer with tractor URSUS C330. The regression equations for determination of skidding cycle time and daily skidding efficiency were worked out. Average skidding efficiency amounted 21,99 m3/8 lh (labour hours) for large−sized and 15,68 m3/8 lh for middle−sized wood.
Źródło:
Sylwan; 2009, 153, 07; 466-471
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zrównoważony łańcuch dostaw drewna na przykładzie wybranego zakładu
Autorzy:
Sieniawski, W.
Porter, B.
Powiązania:
https://bibliotekanauki.pl/articles/881220.pdf
Data publikacji:
2012
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
Źródło:
Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2012, 14, 3[32]
1509-1414
Pojawia się w:
Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of timber loads on gross vehicle weight
Autorzy:
Trzcinski, G.
Sieniawski, W.
Moskalik, T.
Powiązania:
https://bibliotekanauki.pl/articles/38354.pdf
Data publikacji:
2013
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
timber load
forest road
loading
gross vehicle weight
transportation
timber haulage
Opis:
Forest roads are characterized by low traffic, but heavy timber haulage trucks have a significant influence on road conditions and usually exceed the limit of 80–100 kN per axle. The excessive weight of the trucks degrades the road surface and the forest environment. This article presents the results of a study of timber transport loads from their places of acquirement (forest districts) to the recipient (a large sawmill). The analysis includes the parameters of the timber transport vehicles and focuses especially on the gross vehicle weight (GVW), the total weight of empty truck and trailer during transport, and the weight of their loads. Scania, Iveco, Man, and Mercedes trucks with trailers and semitrailers designed for large-size pine timber transport were analyzed. ANOVA results revealed that all 80 analyzed vehicles exceeded the permitted GVW in the range from 2.28 to 19.94 Mg, transporting from 20.1 to 37.5 m3 of timber. The coefficient of determination between the amount of hauled timber and the GVW equaled 62.7%. Research conducted previously concluded that forest roads with ground and gravel surfaces are not suitable for overloads of 120–150 kN per axle. Therefore, it is necessary to find a logistical solution that will allow the load volume to be maintained at an acceptable level without destroying the forest road surface.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 4
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie sezonowe składu pokarmu sarny europejskiej na terenie Żytomierskiego Polesia Ukrainy
The diet of the roe deer (Capreolus capreolus) in the forest ecosystems of Zhytomirske Polesie of the Ukraine
Autorzy:
Krasnov, V.
Shelest, Z.
Boiko, S.
Gulik, I.
Sieniawski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1310939.pdf
Data publikacji:
2015
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
Ukraina
Polesie Zytomierskie
fauna
sarna europejska
Capreolus capreolus
sklad pokarmu
zmiany sezonowe
foraging ecology
stomach content analysis
diet components
Opis:
The botanical composition of the European roe deer diet in the radioactively contaminated forest ecosystems of Zhytomirske Polesie of the Ukraine was investigated. Deer were caught monthly over a two–year period on three plots in forest habitats typical for Zhytomirske Polesie (fresh and moist mixed coniferous forests and mixed broadleaved forests). An analysis of the stomach contents of hunted deer showed that they consumed leafy as well as leafless stems, grasses, fruits and mushrooms depending on the season and availability of forest plants. Each season was characterized by one major dietary component. In the spring, the main component of the deer diet was the stems of woody plants. 44 species of vascular plants (3% of the natural flora of the region) were identified in the roe deer diet including 41 species of Magnoliophyta, of which 34 species of Magnoliopsida and 7 species of Liliopsida, 2 species of Polipodiophyta and one species of Pinophyta. Species such as aspen (Populus tremula), oak (Quercus robur), blackberry (Rubus nessensis) and bilberry (Vaccinium myrtillus) were consumed year-round.
Źródło:
Leśne Prace Badawcze; 2015, 76, 2; 184-190
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radioaktywne skażenie składu pokarmu sarny europejskiej Capreolus capreolus na terenie Żytomierskiego Polesia Ukrainy
Radioactive contamination of dietary components of the roe deer in the forests of Zhytomirske Polesie of Ukraine
Autorzy:
Krasnov, V.
Shelest, Z.
Boiko, S.
Gulik, I.
Sieniawski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1311644.pdf
Data publikacji:
2015
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
zwierzeta lowne
sarny
sarna europejska
Capreolus capreolus
pokarm
sklad pokarmu
podrost
podszyt
krzewinki
grzyby
skazenia radioaktywne
cez promieniotworczy
zawartosc cezu
zmiennosc sezonowa
Polesie Zytomierskie
Ukraina
radioactive contamination
roe deer diet
137Сs
Zhytomirske Polesie of Ukraine
Opis:
This paper presents a study on radioactive contamination of dietary components of the roe deer (Capreolus capreolus) in Zhytomirske Polesie (Ukraine). Studies were conducted on two research plots in forests with similar levels of radioactive contamination, 29 ± 8 kBq/m2 - 55 ± 17 kBq/m2, in mixed coniferous forests and mixed broadleaved forests, which are the dominant forest types of the area. The highest level of radionuclide accumulation was observed in young oak seedlings. The dynamics for oak sprouts indicate that the accumulation coefficient reaches a maximum in September and August in the mixed coniferous and mixed broadleaved forests respectively. A comparison of mean values of the 137Cs accumulation coefficients in the shoots of undergrowth plants confirms that an increase in soil fertility leads to a reduction of radionuclides in plant phytomass. In the mixed broadleaved forests, average values of the coefficient of 137Cs accumulation in phytomass of blackberry was 26% and of raspberries 58% lower compared to mixed coniferous forests. The maximum contamination of phytomass was observed in August for oak, in October for aspen, and in July for birch. The highest specific activity of 137Cs in raspberry shoots occurs during the three summer months, whereas the peak in blackberry occurs from August to September. The dynamics of the specific activity of 137Cs in blueberry, cranberry and heather show an increase in radioactive contamination of phytomass towards the end of the growth period. The maximum concentration of 137Cs in shoots of heather and bilberry was recorded in October and for blueberry in August. Mushrooms in mixed coniferous forests can be ranked as follows according to the degree of 137Cs contamination: Cantharellus < Boletus edulis < Russula < Leccinum < Xerocomus badius < Paxillus involutus. In mixed broadleaved forests the ranking is Cantharellus < Boletus edulis < Russula < Xerocomus badius < Leccinum < Paxillus involutus. Within one habitat type, we observed fairly significant variations in 137Cs accumulation in fruit bodies of fungi species.
Źródło:
Leśne Prace Badawcze; 2015, 76, 3; 221-228
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Typy dokumentacji wojskowej w archiwach hetmanów koronnych
Autorzy:
Syta, Krzysztof.
Powiązania:
Miscellanea Historico-Archivistica 2001, t. 13, s. 49-56
Data publikacji:
2001
Tematy:
Sieniawski, Adam M.
Rzewuski, (rodzina)
Branicki, Jan K.
Dowódcy Polska 16-18 w. archiwalia
Szlachta Polska 16-18 w. archiwalia
Opis:
Typy dokumentacji: administracyjna, finansowa, sądownicza, dyplomatyczna, oddziałów hetmańskich, osobista hetmanów.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Mould walls inclination and dendritic morphology of CMSX-4 blades airfoils
Autorzy:
Krawczyk, J.
Bogdanowicz, W.
Sieniawski, J.
Kubiak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1075667.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.70.+w
61.66.Dk
61.72.Bb
Opis:
The airfoils of single-crystalline turbine blades were studied. The blades made of industrial CMSX-4 superalloy were obtained by the Bridgman technique. Five different withdrawal rates (1-5 mm/min) were used. Series of as-cast samples were prepared by cutting the airfoils at different distances from the blade root. The metallographic sections, prepared for each cutting planes, were subjected to scanning electron microscopy observations and Laue diffraction studies. Macrostructure images of whole area of airfoil cross-sections were obtained by stitching several obtained SEM images. Morphology of dendrites in different area of cross-sections were analysed. The crystal orientation of each sample were determined by analysis of Laue pattern. It was found that the morphology of dendrites changes in the area, where the dendrite growth is limited by inclined mould walls.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1100-1103
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 34

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