Báo cáo lâm nghiệp: "Classifying xylophone bar materials by perceptual, signal processing and wood anatomy analysis" pdf

... article Classifying xylophone bar materials by perceptual, signal processing and wood anatomy analysis Loïc BRANCHERIAU a *, Henri BAILLÈRES a , Pierre DÉTIENNE a , Richard KRONLAND b , Bloen METZGER b a ... twice/cm by marginal parenchyma bands in Swietenia, 15 times by bands in Hymenolobium, while in the woods with poor acoustics the tissues were disrupted 35–50 tim...

Ngày tải lên: 08/08/2014, 00:22

... to the cell walls of early -wood and late -wood tracheids of standard wood. It is obvious that reaction compression wood has a different structure from standard wood. For a modified structure ... different wood properties. Compression wood has a differ- ent structure that is manifested in the researched wood property – density. When processing and using wood where co...

Ngày tải lên: 07/08/2014, 03:22

... Effect of selective logging on canopy and stand structure and tree species composition in a lowland dipterocarp forest in peninsular Malaysia. Forest Ecology and Management, 175: 297–320. O ... species composition by decreasing the number of larger trees, leading to a significant increase in stem density and basal area of pioneer species (e.g. S. matsudana and P. davidi...

Ngày tải lên: 07/08/2014, 03:22

... a sample of the tree species and Table 1. Categories of forest products No. Wood products 1 Fuelwood 2 Construction wood (mainly poles) 3 Saw timber 4 Artisanal wood (utensils, etc.) Products ... this study by use/product category Use/product category Pharmaceutical products 67 Beverages 53 Fuelwood 50 Wood 33 Fibres 30 Construction wood 30 Browse 27 Animal products 27 Honey...

Ngày tải lên: 07/08/2014, 03:22

... made by several trunks) and horse and tractor skidding tracks. e third and the forth category of damage to soil is subdivided into three categories by their depth: under 5 cm, 6–10 cm and ... machine on soil and weather conditions. MATERIAL AND METHODS e effect of wheeled and crawler skidders on for- est environment was evaluated by investigating the damage to under...

Ngày tải lên: 07/08/2014, 03:22

... of Ca, Mg, K, S-SO 4 , N-NO 3 and N-NH 4 in the dense and sparse spruce stand were 15.7 and 11.6, 4.2 and 3.0, 19.2 and 12.7, 22.5 and 16.4, 8.9 and 7.4, 7.7 and 6.6 kg/ha, respectively. R ... ± 60 and 109 ± 58 mm of throughfall in the dense and sparse spruce stand, respectively. Differences in throughfall and rainfall sums were the result of different leaf area in...

Ngày tải lên: 07/08/2014, 04:20

... standard error (7) is influenced by the variability of Y i and X i values, as well as by their correlation (r YX ). Similarly, the relative standard error is derived from the relative standard ... covered by small-sized lying deadwood if all pieces were placed side by side. In the case that deadwood is huddled together, or placed into a pile, it is estimated what area this w...

Ngày tải lên: 07/08/2014, 04:20

... (5.9 and 5.7 mm) and plant height (0.55 and 0.30 m) was found out in both years. In clone 37 the signifi cant diff erence in stem diam- eter was found out in both years (5.3 and 4.7 mm) and in ... larici-populina occurrence and the value of growth traits and biomass yield in Populus nigra  e correlation between the growth traits of stem diameter and plant height and the...

Ngày tải lên: 07/08/2014, 10:21

... distributed randomly. Relict pine wood Natural pine stands in Krkonoše Mountains are marked by low age heterogeneity (the oldest individuals 165 years), low standing volume variability and expressed ... forest stands develop within the small developmental cycle. Beech stands Natural beech stands in the Krkonoše Mts. are marked by high age heterogeneity, low volume and struct...

Ngày tải lên: 07/08/2014, 10:21

... seeds. a: 90 ◦ C for30s,60sand300s.b: 110 ◦ C for 30 s, 60 s and 300 s. c: 150 ◦ C for 30 s, 60 s and 300 s. d: 200 ◦ C for 30 s, 60 s and 300 s. [30]. Pinus tropicalis and P. caribaea var. caribaea ... pure or mixed stands with P. tropicalis on acidic clayey soils, and soils with high iron content (lateritic soils of Cajálbana, W Cuba) quartzite and sandy soils in Pinar del Río...

Ngày tải lên: 07/08/2014, 16:20