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
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
... articlePredicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part II: Computation of macroscopic properties and microscopic stress fieldsPatrick Perré and ... homogenisation: Part II of this paper is devotedto the calculation of the macroscopic properties and the determination of the microscopic stress fields that result from the macroscopic configuration.Computational ... É., Perré P., Predicting Oak Wood Properties using X-ray Inspection: Representation, Homogenisation and Localisation. Part I: Digital X-ray imaging and representation by Finite Elements,Ann....
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Báo cáo khoa học: "Predicting oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part I: Digital X-ray imaging and representation by finite elements" ppsx
... imaging and representation by finite elementsOriginal articlePredicting 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 localization problems are computed and il-lustrated. wood / anatomy ... elastic properties shrinkage + elastic properties macroscopic properties microscopic stress fieldmorphologyFigure 2. How the knowledge of the intrinsic properties of compo-nents and their...
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Báo cáo lâm nghiệp: "Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length" pdf
... verticallocation 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 spatialarrangement of the knots are very often used in the gradingrules of softwood lumber (e.g. [1]). Models can thus success-fully predict wood ... terms of wood quality, the diameter and the lo-cation of branches on a tree stem have a great effect on aes-* Corresponding author: courbet@avignon.inra.frthetic and mechanical wood properties. ...
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Báo cáo lâm nghiệp: "Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation" potx
... analysesThe modelling of ring width and volume increment indices as afunction 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 ncorresponds to the current year of defoliation. RMSE is the root mean square of error and R2 is the coefficient of determination. ... criteria. First, a stand composition cri-terion was applied to limit the scope of this study to balsam fir stands,which were defined as stands composed of at least 50% of merchant-able basal...
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Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx
... 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 occuronly 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 parenchyma. In early sum-mer, the rate of ... regulate its activity.Sources of auxin are the young leaves [14] and, perhaps, theexpanding internodes of young stems. Thus, a certain number of young leaves and internodes may need to have...
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Báo cáo lâm nghiệp: "Predicting the potential distribution of Sirex noctilio (Hymenoptera: Siricidae), a significant exotic pest of Pinus plantations" pot
... 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 thesouth-east of China and of Larix gmelinii in the north east, and P. sylvestris, P. tabulaeformis and Larix is widely planted asafforestation ... dis-tribution and discuss this in relation to the distribution of sus-ceptible hosts in the Southern Hemisphere, North America and China.2. MATERIALS AND METHODS2.1. Known distribution of S. noctilio and...
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Báo cáo lâm nghiệp:"Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire" doc
... the extension of prescribedfires 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 naturalconditions are key factors for sexual regeneration of woodyspecies [3]. In addition, the regeneration of Pinus depends onthe ... exposure time of 1 minute, the probability of germination decreases significantly above 120 ºC. With anexposure time of 5 minutes this decrease occurs at 100 ºC; and with times of 10 and 15 minutes...
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Báo cáo lâm nghiệp: "Predicting solar radiation transmittance in the understory of even-aged coniferous stands in temperate forests" ppt
... larch and Scots pine. Only larch and Scotspine 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 Norwayspruce stands and 21 larch stands. 94% of values were groupedbetween 0.25 and 0.65 of the stand basal area value before thinning. 2.2. ... II. Estimated values of the parameters of the proposed models, and corresponding adjusted R-square values, by species and for pooleddata. Standard errors and estimated mean standard error respectively...
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Báo cáo lâm nghiệp: "Ground based operation effects on soil disturbance by steel tracked skidder in a steep slope of forest" ppt
... 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 compaction282 J. FOR. SCI., 56, 2010 (6): 278–284travel speed and the power of the machine are lim-ited and accrued rutting and mixing of mineral soil ... categories of soil disturbance were moderate and heavy disturbance for SC1 and SC2, respectively. A comparison of rut depths at each level of traffic using t-test analyses showed that irrespective of...
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Báo cáo lâm nghiệp: " A contribution to the properties of combined plywood materials" ppsx
... 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 oak and beech. Journal of Forest ... consisted of disintegrated wood particles in order to create larger and solid composite units, firmer and tougher than the sum of the values of their parts (H, K 2005). At the end of the...
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