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Tytuł:
Przejazdy po drogach leśnych i publicznych przy dostawach wielkowymiarowego drewna sosnowego do tartaku
Driving on forest and public roads in deliveries of large-size Scots pine wood to sawmill
Autorzy:
Tymendorf, L.
Trzciński, G.
Powiązania:
https://bibliotekanauki.pl/articles/979086.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wood supply chain
wood deliveries
transport optimization
backhauling
transport stages
Opis:
The aim of the presented research was to characterize the driving related to the deliveries of large−size Scots pine wood and to determine the factors affecting its structure and distance. Operation was divided in to: driving for load on a public and forest road, forest ride between loading points, as well as driving with saw logs on a forest and public road. Data on the distance traveled on forest and public roads (empty and with load), as well as, the number of loading places was determined on the data from drivers. In total, 1509 randomly selected deliveries carried out over a period of twelve months from 40 forest districts were analyzed. Investigated transports delivered 44,336 m3 of large−size pine round wood to the sawmill. Most deliveries were made within 100 km from the plant. Within this radius, 83.87% of drives for load and 75.35% drives with load were completed. The average distance for driving for load on a public road was 60.6 km, with the range from 0.5 to 205 km. The average driving distance with load to the sawmill was 70 km, the shortest distance 2 km and the longest – 238 km. Driving distances on forest roads, for and with load, was on the similar level of 3.5 and 3.4 km, respectively. The average distance in the forest, between loading points was 3.1 km, with SD=2.9 km, maximum 16 km. The largest share, 51.4% of total delivery distance, was related to driving with saw logs on a public road and depends on how many places in the forest the wood was picked up. In 36% of all deliveries, saw logs were loaded from two or more places, which involved additional drive on forest roads at the distance of 1,652 km. The analysis did not show statistically significant differences between driving depending on the season of the year. The stable wood supply during 12 months period, shows that large stocks of round wood to secure productions during sensitive periods (winter), is not needed.
Źródło:
Sylwan; 2020, 164, 08; 651-662
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Requirements of 4G-Based Mobile Broadband on Future Transport Networks
Autorzy:
Fricke, M.
Heckwolf, A.
Herber, R.
Nitsch, R.
Schwarze, S.
Voß, S.
Powiązania:
https://bibliotekanauki.pl/articles/309203.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
backhauling
LTE advanced
mobile network de-sign
X2 interface
Opis:
Long term evolution technologies provide new standards in mobile communications regarding available bandwidth. It is expected that users of one radio cell will share more than 100 Mbit/s in future. To take advantage of the full feature set of next generation mobile networks, transport network design has to face new requirements, caused by the architectural changes of LTE technologies. Especially the newly defined X2 interface impacts on the transport network requirements. X2 enables direct communication between evolved base stations (eNBs) and thus, enforces local solutions. At the same time a tendency of locating network elements at fewer, central sites to reduce operational expenditure can be observed, in particular concerning the transport layer. This leads to the question of how the direct X2 connection of eNBs on the logical layer can be accommodated with a general centralization of transport networks. Our considerations show that for LTE, a centralized transport network is able to realize the local meshing between eNBs. However, for LTE Advanced, the standards currently discussed by the 3GPP initiative could lead to enhanced requirements on the X2 interface latency. Consequently, the implications for the network architecture have to be analyzed in more detail.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 2; 21-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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