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

... is again a theme of another research inclusive of determination of the elastic constant according to separate layers. Appropriate tests to determine parameters men- tioned above will be the ... density of plywoods significantly a ects the capacity of the material to dampen noise. To achieve good sound-proof properties materials of a density of 630 kg/m 3...

Ngày tải lên: 07/08/2014, 04:20

... moni- toring, then the replacement of the sanding paper subject to the irregular course of abrasion has to be carried out at a half number of rpm. Abrasion of the test specimen e test is carried ... immediately after calibra- tion. Two disks are prepared with conditioned un- used sanding paper from the same batch that was approved by the last calibration. e disk...

Ngày tải lên: 07/08/2014, 10:21

... podagraria, Galium aparine, Stachys sylvatica, Urtica dioica, Impatiens noli-tangere, Equisetum sylvaticum, Deschampsia cespitosa, Cardamine am- ara. In Carpineto-Quercetum acerosum, the highest ... dominance of Acer campestre and young specimens of the tree stratum was recorded with Alliaria of- ficinalis, Veronica hederifolia, Lapsana communis, Urtica dioica and Aristolochia c...

Ngày tải lên: 07/08/2014, 03:22

... damage and the method of estab- lishment of the stands and degree of weed infestation at the time of swarming was evaluated statistically. e daily temperatures at the time of M. hippocastani ... correlation between the extent of the dam- age and method of plantation establishment and degree of weed infestation at the time of swarming was evaluated statistic...

Ngày tải lên: 07/08/2014, 03:22

... population) to verify the stability of the results within a population (data not shown). These prelimi- nary data conducted us to evaluate germination and embryo size pat- terns at a larger scale: ... individuals in a population from a zone of sympatry. Of the above markers, only two RAPD loci were robust in a further study [20]. Overall such markers have poor repeat...

Ngày tải lên: 07/08/2014, 16:20

... function. A program for the estimation of the parameters was written in MATHEMATICA ® [61] since no major software package currently offers the Laplace approximation as an option. Final estimates ... testing. Sensor data from an object (here, a foliage sample) are, with respect to the object, to be treated statistically as repeated meas- urements or longitudinal data [63]....

Ngày tải lên: 08/08/2014, 01:22

... explained by numerous factors, including the rigor- ous climate, predation of seeds and attack by fungi. Among these causes, the under- growth vegetation may have a phytotoxic effect ... Methods Plant extracts The plant material (Vaccinium myrtillus and Athyrium filix-femina) was harvested in the sub- alpine spruce forest (rather open stand, su...

Ngày tải lên: 09/08/2014, 04:20

... quantity and quality of organic matter and by the altitude of sampling sites. e higher values of medians of zinc, lead and cadmium contents are found in the area of the Pass. Chromium is an ... of statistical analysis Exploratory statistical analysis involves the ex- amination of mean values, coefficients of variation, maximum and minimum values, and coefficients of...

Ngày tải lên: 07/08/2014, 10:21

... virgin forest that decides on the degree of its diversity, and namely the percentage of the overall area share of this stage as well as the area alternation with other stages. Regeneration processes Information ... stocks of humus and with the lack of easily accessible nutrients. e average annual temperature reaches about 2–2.5°C and the average annual precipitati...

Ngày tải lên: 07/08/2014, 10:22

... in the calculation. Stand density was calcu- lated according to standard mensurational practice from the ratio of actual basal area of the particular species and tabular data. On the basis of ... at the growth potential in tended beech/larch stands. He also analyzed the relation of the total growing stock to the variable proportion of larch. All studied stan...

Ngày tải lên: 07/08/2014, 03:22