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/m3 are ordinarily used (e.g. Polyvan ... refraction of materials in the whole proﬁle and also in separate layers was not examined. e failure of materials at separate layer interface ow-ing to shear in bending oneself partially approved....

Báo cáo lâm nghiệp: "A contribution to the resistance of combined plywood materials to abrasion" potx

... 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 disks are placed into the apparatus ... Republic ABSTRACT: e aim of the paper was to propose the methodology of testing the abrasion resistance of combined water-proof plywood materials with the phenol-formaldehyde foil surface ﬁnish and...

Báo cáo lâm nghiệp: "A pheasantry as the habitat of small terrestrial mammals (Rodentia, Insectivora) in southern Moravia (Czech Republic)" doc

... 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 clematis as ... hederacea, Rubus caesius and Deschampsia caespitose are dominant. In Saliceto-Alnetum, there is a rich shrub layer dominated by Salix caprea and Sambucus nigra with a herb layer of Aegopodium...

Báo cáo lâm nghiệp: "Ecological conditions influencing the localization of egg-laying by females of the cockchafer (Melolontha hippocastani F.)" pps

... 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 statistically using variance analysis ... mass swarming of M. hip-pocastani in the Vracov locality, we recorded and evaluated the daily maximal, minimal and average temperatures using an automatic meteorological station of the 431...

Báo cáo lâm nghiệp: "New insights in the recognition of the European ash species Fraxinus excelsior L. and Fraxinus angustifolia Vahl as useful tools for forest management" pdf

... 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 repeatabil-ity, and a way around these ... to conduct the test on in-tact samaras (seeds within the fruit), ﬁrst because we wanted to know the ability of both species to germinate without anytreatment at all, and second to be able to...

Báo cáo lâm nghiệp: "An approach for the analysis of vegetation spectra using non-linear mixed modeling of truncated power spectra" pdf

... function. A program for the estimation of the parameters was written in MATHEMATICA® [61] since nomajor software package currently offers the Laplace approximation asan option. Final estimates ... testing.Sensor data from an object (here, a foliage sample) are, withrespect to the object, to be treated statistically as repeated meas-urements or longitudinal data [63]. Longitudinal data are charac-terized ... Leaves from each sample were stacked to cover an area of approximately 10 cm × 10 cm. Multiple layers ratherthan single leaf profiles were used to obtain the reflectance from a layerwith an approximate...

Báo cáo lâm nghiệp: "phytotoxic solutions on the respiration of mycorrhizal and non-mycorrhizal spruce roots (Picea abies L. Karst.) Effect of" pot

... explainedby numerous factors, including the rigor-ous climate, predation of seeds and attackby fungi. Among these causes, the under-growth vegetation may have a phytotoxiceffect ... MethodsPlant extracts The plant material (Vaccinium myrtillus andAthyrium filix-femina) was harvested in the sub-alpine spruce forest (rather open stand, subject to forestry law, ... law, northern exposure at an altitude of between 1600 and 1800 m). It was dried atroom temperature and ground to a powder. The material was then extracted in water by...

Báo cáo lâm nghiệp: "A survey of forest pollution with heavy metals in the Natural Forest Region (NFR) Moravskoslezské Beskydy with particular attention to Jablunkov Pass" docx

... 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 analysisExploratory statistical analysis involves the ex-amination of mean values, coeﬃcients of variation, maximum and minimum values, and coeﬃcients of skewness and kurtosis. ... 69RESULTS OF LEAF ANALYSES The results of analyses of spruce needles and beech leaves are presented in Table 4. As far as the macronutrients are concerned, the median of the results is in accordance...

Báo cáo lâm nghiệp: "A change in structural diversity and regeneration processes of the spruce virgin forest in Nefcerka NNR (TANAP) in relation to altitude" docx

... 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 processesInformation ... 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 precipitation is 1,200–1,300 mm.In the Nefcerka Valley, ... understandable. On the other hand, the eval-uation in relation to altitude conﬁrmed the eﬀect of climate changes. e value of the Füldner index rises with the ascending altitude and at an altitude above...

Báo cáo lâm nghiệp: "Production potential and ecological stability of mixed forest stands in uplands – VI. A beech/larch stand on a mesotrophic site of the Křtiny Training Forest Enterprise" pot

... 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 stands (aged 55 to 150 years) ... used to obtain quality estimates of mean values and their interval estimates. The programmes Statistica CZ 7 and QCExpert were used for statistical analysis.At the time of the plot establishment...

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