Báo cáo lâm nghiệp:"Predicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation Part II: Computation of macroscopic properties and microscopic stress fields" pdf

... article Predicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part II: Computation of macroscopic properties and microscopic stress fields Patrick Perré and ... homogenisation: Part II of this paper is devoted to the calculation of the macroscopic properties and the determination of th...

Ngày tải lên: 08/08/2014, 01:21

... imaging and representation by finite elements Original article Predicting oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part I: Digital X-ray imaging and ... homogenization principle and a few exam- ples of calculations of the properties. Macroscopic properties (mechanical and shrinkage) and some localiza...

Ngày tải lên: 08/08/2014, 14:21

... vertical location of branches in the crown partly governs their further growth and mortality from which depend (i) the stem growth and form and (ii) the quality of lumber and veneer, including wood knots. ... trans- formations and valorization processes. The size and the spatial arrangement of the knots are very often used in the grading rules of softwood lumber (e.g. [1...

Ngày tải lên: 07/08/2014, 16:21

... analyses The modelling of ring width and volume increment indices as a function of defoliation of the current and the past 10 years was per- formed using the MIXED procedure of the SAS system that ... light and S = moderate to severe) and the year of defoliation where n corresponds to the current year of defoliation. RMSE is the root mean square of error and R 2 is...

Ngày tải lên: 08/08/2014, 00:21

... internal and relates to patterns of cellular development, such as the annual increment of the secondary vascular tissues, phloem and xylem. However, growth and development occur only within part of ... consequence of the balance maintained between the rate of periclinal cambial cell divisions and the rate of differentia- tion of the cells as xylem fibres and parenchy...

Ngày tải lên: 08/08/2014, 00:22

... Scott J.K., Potential risks of accidental introduction of Asian gypsy moth (Lymantria dispar) to Australia and New Zealand: effects of climatic conditions and suitability of native plants, Agric. ... et al. There are large areas of forests of P. massoniana in the south-east of China and of Larix gmelinii in the north east, and P. sylvestris, P. tabulaeformis and Lari...

Ngày tải lên: 08/08/2014, 00:22

... the extension of prescribed fires as an alternative means of favouring the regeneration of Scots pine. REFERENCES [1] Ahlgren C.E., Some effects of fire on reproduction and growth of vegetation ... conditions. The viability of seeds and the survival of seedlings in natural conditions are key factors for sexual regeneration of woody species [3]. In addition, the regeneratio...

Ngày tải lên: 08/08/2014, 01:21

... larch and Scots pine. Only larch and Scots pine had stand ages above 50 years; 7 stands for larch (at the same age of 92 years) and 20 stands for Scots pine, i.e., a proportion of 13% of all ... area) was available only for 28 Douglas fir stands, 26 Norway spruce stands and 21 larch stands. 94% of values were grouped between 0.25 and 0.65 of the stand basal area value befo...

Ngày tải lên: 08/08/2014, 01:22

... skid trail in the natural forest of north of Iran. Combination of two levels of slope < 20% (SC1) and > 20% (SC2) and three levels of traffic (one, five and nine traffics) were studied. Treatment ... skidding; hardwood forest of Iran; soil compaction 282 J. FOR. SCI., 56, 2010 (6): 278–284 travel speed and the power of the machine are lim- ited and accrued rutting a...

Ngày tải lên: 07/08/2014, 03:22

... Analysis of properties of boards for concrete formwork. Journal of Forest Science, 50: 382–398. HRÁZSKÝ J., KRÁL P., 2005. Effects of the thickness of ro- tary-cut veneers on properties of plywood ... sheets. Part 1. Compressibility of plywood materials. Journal of Forest Science, 51: 313–321. KRÁL P., HRÁZSKÝ J., 2003. Effect of negative factors on the use of...

Ngày tải lên: 07/08/2014, 04:20