Báo cáo lâm nghiệp: "Research on individual parameters for cutting power of woodcutting process by circular saws" docx

... constraints for the expectation method. 5. Final Remarks In this paper, a class of stochastic bi-criteria optimization problems was studied by a new hybrid method where the chance-constrained ... management problem,” Journal of Inequalities and Applications, vol. 2009, Article ID 970723, 16 pages, 2009. 9 J. Xu and J. Li, A class of stochastic optimization...

Ngày tải lên: 21/06/2014, 07:20

... parts: Research on individual parameters for cutting power of woodcutting process by circular saws J. K, M. M Department of Forest and Mobile Technology, Faculty of Environmental and ... mass of a work- piece by a cutting- wedge during the deformation of a mass in the surroundings of a cutting edge, – forces necessary for deflection of chips...

Ngày tải lên: 07/08/2014, 03:22

... 2/0045/08, and by the Slovak Research and Development Agency, Contract No. APVV-0102-06. Changes in air quality in different phases of forest management process in a sub-mountain beech ecosystem (West ... ecosystem (West Carpathian Mts.) D. K Institute of Forest Ecology, Slovak Academy of Sciences, Zvolen, Slovakia ABSTRACT: We studied ai...

Ngày tải lên: 07/08/2014, 03:22

... 70 J. FOR. SCI., 57, 2011 (2): 70–77 JOURNAL OF FOREST SCIENCE, 57, 2011 (2): 70–77 Spatially constrained harvest scheduling for strip allocation under Moore and Neumann neighbourhood ... t. In the case of strip window management, each forest stand was divided into strips following com- mon shelterwood management conventions for strip width and forest stand borde...

Ngày tải lên: 07/08/2014, 10:21

... subtraction of the initial content of available mineral N (for the anaerobic incubation of NH 4 + -N content); N initial ‒ initial content of available mineral N (for the anaerobic incubation of NH 4 + -N ... the mineralization of nitrogen in the sur- face mineral layer of forest soils is diff erent from that in the forest fl oor. Besides, total c...

Ngày tải lên: 07/08/2014, 10:21

... of the 1990s. Forest soils showing the insufficiency of main nutrients remain today as the main factor affecting the forest vitality. e situation in the soil is subsequently reflected in the nutrition ... of the decline of Norway spruce (Picea abies [L.] Karst.) stands in Jablunkov, with a focus on air pollution load, and the state of forest soil and nu...

Ngày tải lên: 07/08/2014, 10:21

... correlation between the aboveground parameters and the depth of root plates in spruce trees growing both in waterlogged and in well-drained sites. According to our results, it seems that the roots of ... 353 JOURNAL OF FOREST SCIENCE, 56, 2010 (8): 353–360 Relationships between the parameters of aboveground parts and the parameters of...

Ngày tải lên: 07/08/2014, 10:22

Ngày tải lên: 07/08/2014, 16:20

... 1902. Measurement of standing tree shape by photographic method 635 Figure 4. 3D reconstruction of the 70-year-old Norway spruce tree. Figure 5. Photographic method estimates of the local slope ... position of the standing trees. The disadvantages of this method are that a minimum of three targets per log must be attached to the stem of standing trees, a...

Ngày tải lên: 07/08/2014, 16:21

... separating peripheral wood (PW), red heartwood (RH) and non red heartwood (NRH) points (mean for 342 boards). Colour variations of European beech wood 631 Figure 6 illustrates these variations of colour for L* only ... 10.1051/forest:2005063 Original article Studies on European beech (Fagus sylvatica L.). Part 1: Variations of wood colour paramet...

Ngày tải lên: 08/08/2014, 00:22

... 237 Ann. For. Sci. 60 (2003) 237245 â INRA, EDP Sciences, 2003 DOI: 10.1051/forest:2003015 Original article A height-diameter model for Pinus radiata D. Don in Galicia (Northwest Spain) Carlos ... The model of Tomé gave the best height estimates. Pinus radiata D. Don / forest modelling / Galicia / height-diameter relationship Résumé – Un modèle hauteur-dia...

Ngày tải lên: 08/08/2014, 01:21

... Q frainetto, the latter resulting to be the most heavily declining species (Sicoli et al, 1993). Original article Observations on Armillaria occurrence in declining oak woods ... pre- dominates on declining oaks in southern Italy, further surveys were carried out in numerous oak woods and additional Armillaria isolates were collected....

Ngày tải lên: 08/08/2014, 18:21

... influences of decline on genetic structure of stands in the next generation. Preconditions for that are investigations con- cerning the state of damage of oak trees and the complete ... gene conservation and forest tree breeding, it is important to gain information about the genetic structure effect on the sensitivity to ’European oak...

Ngày tải lên: 08/08/2014, 18:21

... experiment on the effect of girdling and gibberellin application on flowering induction of 12 yr old seedlings of Douglas fir and Norway spruce M. Bonnet-Masimbert with the technical ... References Bonnet-Masimbert M. (1987) Preliminary results on gibberellin induction of flowering of seedlings and cuttings of Norway sp...

Ngày tải lên: 09/08/2014, 04:20

... plant cuticular membranes. An overview. Studies on Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) needle cuticles S. Huttunen M. Turunen J. Reinikainen Department ... Results The young needles of Norway spruce (Picea abies L. Karst.) develop in early June under northern Finnish conditions, the Sc...

Ngày tải lên: 09/08/2014, 04:20