Báo cáo lâm nghiệp: "Study of the properties of thirteen tropical wood species to improve the prediction of cutting forces in mode B" pptx

... to estimate cutting forces during wood machining, a factor remains difficult to take intoconsideration: the influence of wood species. Therefore, the aim of this study is to understand the influence ... estimating cutting forces involved during machining, particularly withdifficulties in taking the influence of wood species intoaccount accurately (with the specific gravity factor “Ke”). To solve ... articleStudy of the properties of thirteen tropical wood species to improve the prediction of cutting forces in mode B.Florent EYMAa*, Pierre-Jean MÉAUSOONEb, Patrick MARTINca IUT Paul...

Báo cáo lâm nghiệp: "Study of natural hybridization between Alnus incana (L.) Moench. and Alnus glutinosa (L.) Gaertn" pptx

... sporadically in the area and very rarely in the zone of continuous distribution of the species. Some increase in fre-quency of hybridization is noted by the northern boundary of the species areas, ... data, in Central Siberian Botanical Garden, SB RAS (Novosibirsk, Russia) the end of ﬂowering of A. incana falls as usual on the beginning of ﬂowering of A. glutinosa. Separate samples of A. incana ... preventing hybridization between A. incana and A. glutinosa, there are some other mechanisms of their isolation, as these species grow together in a large area in different climatic conditions. The...

Báo cáo lâm nghiệp: "Reconstructing crown shape from stem diameter and tree position to supply light models. I. Algorithms and comparison of light simulations" doc

... meas-urements. In this study, we tested the possibility of connecting adetailed light model to a crown reconstruction model and to using the crown model to supply the required individual crowndata to the ... is one of the eight radii Ri (i from 1 to 8, in solid lines ( )), describing the projection of the crown in the horizontal plane passing through point M. This projection is the grey area. The geometrical ... Tree-level models usually give an accurate prediction of PACL under or within the canopy, even in heterogeneousstands. The main drawback of these models is the large number of parameters that need to...

Báo cáo lâm nghiệp: "Molecular markers provide evidence for long-distance planting material transfer during plantation establishment of Dalbergia sissoo Roxb. in Nepal" pot

... differentorigin of this plantation as compared to the others. The intro-duction of material with different origin increased the totalvariation of cpDNA found in plantations. The observation of differentiation ... variation pat-terns in natural populations. Further studies involving materialfrom other regions of the species distribution may allow to gainadditional insights in the human impact on genetic ... unknown. Today’soccurrence of the species in natural forests in Nepal is restricted to a few fragmented relics of autochthonous populations. Molecular gene markers can be powerful tools to assess the evolutionary...

báo cáo hóa học: " TCP NCE: A unified solution for non-congestion events to improve the performance of TCP over wireless networks" docx

... value of cwnd. When the sender receives new ackincluding the value stored in the varaible Recover, the sender sets the size of cwnd to the value of ssthreshand then goes to CA phase. On the other ... throughput of the ith flow (0 <i ≤ N) normalized to the total achievablethroughput in the link and N is equal to total number of flows sharing the link. Figure 28 shows the fairness of TCP NCE ... correctly in the face of non-congestion events especially in the case of packet reordering rather than using an algorithm thatsamples one RTT p er window of data. The reason is, in the presence of...

Báo cáo lâm nghiệp: "Multivariate statistical approach to comparison of the nutrient status of Norway spruce (Picea abies [L.] Karst.) and top-soil properties in differently managed forest stands" potx

... Differences in the properties of the particular sampling points and the fact that the in uence of soil heterogeneity on the specificity of forest stand cannot be fully neglected complicate the interpretation ... used to evaluate the close-ness of the nutrient status of the spruce stands and to assess the closeness of chemical properties of the studied sites. e results were tested by PCA. To test the ... penetrates into the intervals of values and SPs from ASS (Fig. 2). e properties of Ep-horizons do not show the specificities of RPs reliably (Fig. 3). CLU with single linkage (method of the nearest...

Báo cáo lâm nghiệp: "Comparison of the impact of blue spruce and reed Calamagrostis villosa on forest soil chemical properties" pot

... primarily.After the air pollution induced decay of forest stands in the mountain regions of the Czech Re-public in 1970s to 1990s, there was a problem of autochthonous tree species planting failure on the ... 1998. e in uence of selected factors on the biomass production of the Calamagrostis arundinacea species in the conditions of submountain beech forests. Lesnictví-Forestry, 44: 145–152.KANTOR ... phosphorus in Ah of PP soil. With the exception of magnesium, the content of nutrients rapidly lowered with increasing depth of soil (Table 3).Also share of carbon and nitrogen was very similar in...

Báo cáo lâm nghiệp: " Selected physical properties of initial soils on the outside spoil bank of the Bełchatów brown coal mine" pot

... an increase in the percentage of macropores in the initial humus horizon (AinCan) of the investigated soils. The content of easily and very easily available (EUR) water was the highest in the ... in uence on the processes of forma-tion of initial soils, and therefore on the quality of forest sites coming into being (S 1958). e purpose of the study presented in this paper was to estimate ... capacity of soil as the soil moisture potential in the range of pF* 2.0 – pF 4.2 in the process of drying ( *the unit pF was introduced Selected physical properties of initial soils on the outside...

Báo cáo lâm nghiệp: "Results of a phenological study of the tree layer of a mixed stand in the region of the Drahanská vrchovina Upland" ppt

... and the beginning of foliage became evident in all monitored species most mark-edly. Because of a rapid increase in temperatures in May 2006, the duration of the stage of the beginning of ... onset of the stage of budbreak and the beginning of foliage in monitored species slightly fell behind compared to previous years.Eﬀects of temperature on the onset and duration of the stage of ... reported the highest correlation of the onset of the phenological stage of budbreak in spruce with air temperature in Febru-ary to May. ey also evaluated the beginning of ﬂowering in Norway...

Báo cáo lâm nghiệp: " A contribution to the properties of combined plywood materials" ppsx

... and tougher than the sum of the values of their parts (H, K 2005). At the end of the 70s and at the begin-ning of the 80s of the 20th century, the principle of plywood allowed the ... consists in the loading of a sample that is suspended on two supports whereas the sin-gle loading interacts in the middle of sample (Figs. 4 and 5).During the test the width and thickness of the ... F2 40% of maximal loading, a2 – a1 – increase in the deﬂection of the sample at the point of load force (mm), adequate to loading increment (F2 – F1).e modulus of elasticity of each...

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