scholarly journals Utilization of spruce (Picea abies [L.] Karst.) and beech (Fagus sylvatica L.) wood in plywood production using different processing pressures

2014 ◽  
Vol 60 (No. 12) ◽  
pp. 495-499
Author(s):  
P. Král ◽  
P. Klímek
Keyword(s):  
Picea Abies ◽  
Fagus Sylvatica ◽  
Longitudinal Direction ◽  
The Other ◽  
Levels Of Processing ◽  
Bending Properties ◽  
Laboratory Conditions ◽  
Fagus Sylvatica L ◽  
The Common ◽  
Better Than

In this research the spruce plywood board and combined spruce-beech plywood board were prepared in laboratory conditions using two levels of processing pressure. The bending properties in perpendicular and longitudinal direction were measured and compressibility and density were specified. Considering the obtained results, there was found an overall increase of the bending properties in spruce plywood manufactured by the higher pressure and a decline of properties perpendicular to the grain in combined spruce-beech plywood board. On the other hand, combined spruce-beech plywood boards produced by the common processing pressure performed better than both types of spruce plywood.  

scholarly journals Responsiveness to acoustic stimulation, distribution and habitat preferences of the Grey-headed Woodpecker, Picus canus, and the Three-toed Woodpecker, Picoides tridactylus, in Friuli-Venezia Giulia (North-eastern Italy)

2015 ◽  
Vol 84 (1) ◽  
pp. 41
Author(s):  
Gianluca Rassati
Keyword(s):  
Picea Abies ◽  
Sea Level ◽  
Habitat Preferences ◽  
Acoustic Stimulation ◽  
The Other ◽  
Altitudinal Belt ◽  
Ne Italy ◽  
North Eastern ◽  
Fagus Sylvatica L ◽  
Friuli Venezia Giulia

The study was carried out from 2003 to 2011 with the aim of determining the responsiveness to acoustic stimulation, the distribution and the habitat preferences of <em>Picus canus</em> and <em>Picoides tridactylus</em> in Friuli-Venezia Giulia (NE Italy). <em>P. canus</em> resulted as being more responsive than <em>P. tridactylus</em> to conspecifics stimulation, responding in 13.23% of the points where a stimulus was emitted, against 7.65% of the other species. In both taxa, when there was a response, it was predominantly by the male birds. The most frequent type of response in <em>P. canus</em> was song, heard in 57.89% of the points, while for <em>P. tridactylus</em>, it was drumming, which was heard in 65.38% of the points. For both species (especially for P. tridactylus), a tendency was recorded to expand the range and to occupy new areas within the known range. <em>P. canus i</em>n Friuli-Venezia Giulia was found from altitudes close to the sea level up to the treeline (range 0-2000 m a.s.l.), while <em>P. tridactylus</em> was found in montane and subalpine woodlands (range 800- 2000 m a.s.l.). The observations of P. canus were obtained at a mean altitude of 977 m a.s.l. (± 402 SD), located in the altitudinal belt dominated by Fagus sylvatica L., which is present in more than half of the woodlands in which the woodpecker was found.<em> P. tridactylus</em> was discovered at a mean altitude of 1424 m a.s.l. (± 246 SD), located in the altitudinal belt dominated by Picea abies (L.) H. Karst., which is present in almost 90% of the woodlands in which this species was found. In some areas, densities of 0.67-2.26 territories/100 ha were obtained for<em> P. canus</em> and 0.16-0.40 territories/100 ha for <em>P. tridactylus.</em> In Friuli-Venezia Giulia, a population of 320-390 pairs of P. canus and 45-60 pairs of P. tridactylus has been estimated, with an approximate 15% increase of<em> P. canus</em> compared to the beginning of the century, and just over 60% for the other species. Finally, some aspects concerning conservation-related problems are reported.

Measured temperature and moisture profiles during thermal modification of beech (Fagus sylvatica L.) and spruce (Picea abies L. Karst.) wood

Holzforschung ◽  
2014 ◽  
Vol 68 (2) ◽  
pp. 175-183 ◽  
Author(s):  
Petr Čermák ◽  
Petr Horáček ◽  
Peter Rademacher
Keyword(s):  
Picea Abies ◽  
Fagus Sylvatica ◽  
Soret Effect ◽  
Exothermic Reaction ◽  
Longitudinal Direction ◽  
Thermal Modification ◽  
Measured Temperature ◽  
Moisture Movement ◽  
Chamber Temperature ◽  
Moisture Profiles

Abstract The temperature and moisture profiles during thermal modification of beech (Fagus sylvatica L.) and spruce (Picea abies L. Karst.) wood have been investigated. Specimens with dimensions of 80×80×200 mm3 were heat treated based on ThermoWood technology. Heat transfer was continuously measured by several thermocouples placed into various positions of the samples. In the course of the treatment, samples were removed from the chamber at different times, and their moisture content (MC) was measured by the so-called slicing technique. The complete data of heat and moisture movement during the heat treatment process are presented. Significant temperature gradients occur in the initial and modification stages of the process. In the latter, the chamber temperature was 200°C for 3 h, but exothermic reaction increased the sample temperatures to 240°C (beech) and 215°C (spruce). Thermodiffusion (Soret effect) at the beginning of the process was observed. Therefore, the MC under surfaces (in transverse and in longitudinal direction) was increasing ∼0.5%–3% for 5 h. The results provide a better insight into details of thermal modification of wood.

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