Báo cáo lâm nghiệp: "Reduction of wood hygroscopicity and associated dimensional response by repeated humidity cycles" doc

... reduction of wood response to variations of ambient humidity, described as kind of ageing, has been studied from both points of view of moisture uptake and dimensional changes. Clearwood specimens ... the loss of response in aged wood in terms of mois- ture content of the wood translates into a loss of dimensional Table II. Slope of sorption isotherm for t...

Ngày tải lên: 08/08/2014, 00:21

... Norway spruce; root system Supported by the Ministry of Agriculture of the Czech Republic, Project No. QG 60060, and by the Ministry of Education, Youth and Sports of the Czech Republic, Project No. ... trees of diff erent age in selected stands of Krkonoše Mts. National Park Forest stand designation Number of MSR (pcs) Average length of MSR (cm) Average diamete...

Ngày tải lên: 07/08/2014, 10:21

... Proportions of the quality classes of logs of clone Ro- busta with zero and 40% damage of stems of quality class A Fig. 2. Proportions of the quality classes of logs of clone I-214 with zero and 40% ... started by the construction of tree assortment tables (P et al. 2007) and continued by constructing stand assortment tables. e aim of the paper is the c...

Ngày tải lên: 07/08/2014, 10:21

... the effect of temperature on mechanical properties of wet wood provide important data for wood rheology, regardless of peeling and machining applications. The complex behaviour of wood is related ... C.C., Effect of moisture content and temperature on the mechanical properties of woods: an analysis of immediate effects, Wood Fiber 14 (1982) 4–36. [4] Goring D.A.I., T...

Ngày tải lên: 08/08/2014, 01:21

... formulation for simulation of deformations and stresses in wood dur- ing drying is given by where &jadnr; is the rate of nodal displacement vector and K, P and Po are stiffness ... matrix, load vector and pseudo-load vector, re- spectively, given by and where N and B are shape functions and strain shape functions for the eleme...

Ngày tải lên: 08/08/2014, 18:21

... determination of the value of loss and recruit- ment, and calculation of increment, can be accom- plished by two control measurements of the stand, one at the beginning and one at the end of the study ... determination of stages and phases of development of the forest of a primeval character. e analysis of loss, recruitment, and increment renders a full de...

Ngày tải lên: 07/08/2014, 03:22

... Principles and applications. Part II – eo- ries of drainage and watershed runoff. Wageningen, Interna- tional Institute of Land Reclamation and Improvement. H Z. (1995): Draining of forest ... hydrograph by separation its recession limb and determining only the runoff con- stituents and their comparison also in the process of time. Similarly, the influence of land...

Ngày tải lên: 07/08/2014, 03:22

... influ- ence of transplant shock and of the clone growth by site conditions interaction. But the results confirm a possibility of using the spruce clone stock and in situ selection for the selection of ... 1995). K and H (1998) and K (2000) stated that the height growth of clones by site interaction often changed with the age of clone plantation. ...

Ngày tải lên: 07/08/2014, 03:22

... spruce and beech stands were statistically evaluated by paired t-test for dependent samples. RESULTS AND DISCUSSION From the aspect of the depth of snow precipita- tion and duration of snow ... methodology and results of studies have already been published in a number of papers (e.g. K 1984, 1995). In winter and in the period of spring melting, overland and...

Ngày tải lên: 07/08/2014, 04:20

... yield and quality by inoculation with VAM fungi and Rhizobium bacteria. Angewandte Botanik, 65: 23–33. LIU A., HAMAL C., HAMILTON R.I., MA B.L., 2000. Ac- quisition of Cu, Zn, Mn and Fe by mycorrhizal ... 1978. Effects of interac- tion between different culture fractions of phosphobacteria and Rhizobium on mycorrhizal infection, growth and nodulation of Medicago sativa....

Ngày tải lên: 07/08/2014, 04:20