Báo cáo lâm nghiệp: "Energy consumption of a chipper coupled to a universal wheel skidder in the process of chipping wood" pptx

... In practice we can find more names of these ma- chines like chipper, cutting machine and grinder of wooden mass. All these names are characteristic of a machine which uses mechanical way of ... power and to compare the frequency of rotation on the outlet shaft of the skidder in the process of chipping regarding the torque depend- ing on measurement par...

Ngày tải lên: 07/08/2014, 10:21

... brought to a laboratory from the research area. The samples of litter mass were taken from 0.5 m 2 area by collecting all the litter mass in that area. Rut depths were measured in the same points ... these machines are likely to remain the most common type of skid- ding machine used. In mountainous and steep areas, the terrain slope is an important factor tha...

Ngày tải lên: 07/08/2014, 03:22

Ngày tải lên: 08/08/2014, 01:22

... et al. (1996). A significant increase in radial increment of Norway spruce in Austria in the period of 1961 to 1990, during which the length of growing season increased by 11 days associated ... forest evaluation in Slo- vakia was used as a parameter for the quantification of wood-production function. is parameter is the main component of the classic Faust...

Ngày tải lên: 07/08/2014, 10:21

... interannual variation of ring width index are not included in the model. Past- and cur- rent-year temperature and precipitation are examples of such variables that can explain a large part of the ... defoliation record to each site where balsam fir was sampled for stem analysis according to the known latitude and longitude of adjacent permanent sample plots. A database...

Ngày tải lên: 08/08/2014, 00:21

... coordinate along the first axis of a CA as a potential predictor of the site index variation of Abies alba in the Vosges mountains. 4.2.3. Site index indicator values The non-parametric kernel estimation ... Ellenberg indicator values, CA Axes and finally the different variables combined. The table gives model number, equation, R 2 and standard error. G: lateral water...

Ngày tải lên: 08/08/2014, 00:22

... assumptions of normality and equal variance not be satisfied by applying an appropriate transformation of the data. In these cases, a Kruskal-Wallis one way ANOVA on ranks was carried out. Where the ANOVA ... growth potential (n = 16 to 50). In the analysis of transpiration data, there were 3 replications of each hardening regime with a separate ANOVA for every date o...

Ngày tải lên: 08/08/2014, 01:21

... ecologically interpreted. A usual way for assessing the quality of CA is to compute, λ CA,k , the eigenvalue associated to the kth ordination axis: λ CA,1 ... ≥ λ CA,2 ≥ ≥ λ CA,k ≥ λCA,k + 1 ≥ The same quantities, λ CCA,k , may be computed for C...

Ngày tải lên: 08/08/2014, 18:21

... vegetative propagation, clonal selection. A real-scale approach of the clonal culture was carefully investigated at Pointe-Noire (25 000 ha) as well as at Aracruz (90 000 ha) and dangers ... at the Unit6 d’Affores- tation Industrielle du Congo (U .A. LC.). A lot of results were also taken from the plantations of Aracruz Florestal S .A. in...

Ngày tải lên: 09/08/2014, 02:20

... reboisement. Summary Variability of beech susceptibility to N. ditissima canker 17 mature trees of the same stand, have been classified into four groups according to canker severity in ... h12" alt=""

Ngày tải lên: 09/08/2014, 06:21