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Wyszukujesz frazę "eucalyptus tree" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Estimating forest biomass by remote sensing RADAR data in Brazil
    Autorzy:
    Santos, J.R.
    Gama, F.F.
    da Conceicao Bispo, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/52438.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    forest biomass
    biomass modelling
    forest inventory
    tropical forest
    remote sensing
    eucalyptus tree
    stand
    RADAR data
    Brazil
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 192
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wstępna ocena możliwości zafałszowania olejków eterycznych
    Pre-assessment of the essential oils adulteration
    Autorzy:
    Chyc, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1402365.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    ATR-FTIR
    ylang-ylang
    olej paczulowy
    olejek drzewa herbacianego,
    olejek eukaliptusowy
    patchouli oil
    tee tree oil
    eucalyptus oil
    Opis:
    W artykule przedstawiono wyniki badań nad oceną możliwości zafałszowania olejków eterycznych dostępnych na polskim rynku. Badania przeprowadzono za pomocą analizy z zakresu podczerwieni (FTIR) na próbkach olejków: drzewa herbacianego, eukaliptusowego, ylang-ylang i paczulowego. Otrzymane widma FTIR porównano z widmem oleju (tłuszczu) roślinnego. Na podstawie przeprowadzonej analizy stwierdzono, że olejek paczulowy zostały zafałszowany, natomiast w przypadku olejku ylang-ylang zastosowana metoda analityczna nie daje możliwości jednoznacznej informacji dotyczącej zafałszowania olejku.
    The paper presents the results of investigation on the assessment of the possibility of adulteration of essential oils available on the Polish market. The research was carried out by means of an infrared (FTIR) analysis on samples of the following oils: tea tree, eucalyptus, ylang-ylang and patchouli. The obtained FTIR spectra were compared with that of vegetable oil (fat). Based on the analysis, it was found that the patchouli oil was adulterated. ATR-FTIR is not very useful method sufficiently reliable method to confirm adulteration of ylang-ylang oil.
    Źródło:
    Science, Technology and Innovation; 2020, 11, 4; 1-7
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasoning Characteristics and Potential uses of Eucalyptus pilularis, Eucalyptus viminalis and Trichilia dregeana lumber tree species
    Autorzy:
    Kaba, Gemechu
    Desalegn, Getachew
    Powiązania:
    https://bibliotekanauki.pl/articles/1031739.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Eucalyptus pilularis
    Eucalyptus viminalis
    Lumber quality
    Trichilia dregeana
    moisture content
    seasoning
    seasoning defects
    shrinkage characteristics
    timber species
    Opis:
    Technical information on lumber seasoning, moisture content (MC), density, mechanical, workability and chemical characteristics would strongly determine rational utilization of each lumber species. A study was conducted on home-grown two Eucalyptus species (Eucalyptus pilularis and Eucalyptus viminalis) and one indigenous (Trichilia dregeana) timbers with the main objective of determining some characteristics of lumber that will indicate quality and proper utilization. Study species were harvested from Shashemene, Asella and Arjo sites, respectively. The experimental design for seasoning and density was complete randomized design, a factorial experiment. The experiments were conducted using air and kiln seasoning methods. To determine initial moisture content oven drying method was used. The mean initial MC for the three timber species were 48.25%, 56.1% and 65.45%, respectively. The species were classified as very rapid seasoning rate during kiln seasoning. The mean shrinkage values were Tangential (6.31, 4.94 and 4.43%), radial (3.4, 4.02 and 2.10%) volumetric (9.46, 8.6 and 6.37%), when they seasoned from green to 12% MC, respectively. Seasoning defects such as cup, bow, crook, end split, surface and end-checks were observed, though the extent varies with species. The density of E. pilulalris, E. viminalis and T. dregeana at 12% MC was 780, 810 and 530 Kg/m3, respectively. The one-way analysis of variance indicated that there was significant difference (P>0.001) in initial MC, final MC, density values at different MC and shrinkage characteristics. They revealed good lumber characteristics and qualities, comparable with many indigenous and home-grown exotic timber species in density, seasoning rate and shrinkage. The tree species have to be well managed, properly harvested and sawn. Boards have to be properly stacked and seasoned to about 12% MC, with kiln and air seasoning methods that can help to minimize seasoning time, seasoning defects, shrinkage characteristics and increase quality.
    Źródło:
    World News of Natural Sciences; 2020, 29, 3; 162-178
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of tree species, preferences by farmers in Albertine rift, Uganda
    Autorzy:
    Tumuhe, C.L.
    Nyamaizi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049681.pdf
    Data publikacji:
    2020
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    tree species
    tree planting
    farmer
    preference
    Eucalyptus
    Pinus
    fruit tree
    Uganda
    tree-species preferences
    Albertine rift
    Opis:
    There have been several efforts to plant trees in Uganda but the rate of tree planting has remained low perhaps due to coercing farmers to plant the tree species against their preference. In this study, the tree species’ preferences of farmers in Albertine rift are presented. Key informant interviews, focus group interviews and semi-structured household survey questionnaires were used. A sample of 218 households was selected randomly to include both tree farmers and non-tree farmers in Kiryanga Sub County. The descriptive summaries and content analysis were used in data analysis. Results indicate that Eucalyptus spp., Pinus spp., and fruit trees were most preferred. Farmers have different tree species’ preferences due to the benefits obtained from them. Provision of these suitable tree species’ seedlings will highly incentivize and enhance tree planting in Uganda.
    Źródło:
    Environment, Earth and Ecology; 2020, 4, 1; 7-14
    2543-9774
    2451-4225
    Pojawia się w:
    Environment, Earth and Ecology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Allometric models for estimating aboveground biomass in tree sprouts of three dendroenergetic crops
    Autorzy:
    Ríos-Saucedo, J.C.
    Acuña-Carmona, E.
    Cancino-Cancino, J.
    Corral-Rivas, J.
    Rosales-Serna, R.
    Valenzuela-Núñez, L.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078210.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    bio-energy
    short rotation
    Eucalyptus globulus
    Eucalyptus denticulata
    Acacia dealbata
    dummy variables
    Opis:
    Recurrent problems have been observed for biomass measurement in tree sprouts, mainly due to differences in patterns of biomass distribution and the bias generated by using models for mature trees. The objective of this research was to evaluate models to estimate aboveground biomass in sprouts from two-year-old stumps of Short Rotation Woody Crops (SRWC) used for energetic purposes. The study was conducted in Central Chile (Bío-Bío region) under a complete block design and four replications. Three plant species were included: Eucalyptus globulus, E. denticulata, and Acacia dealbata, established in three population densities (5,000, 10,000 and 15,000 trees per ha). Two groups of nonlinear models were used on three independent variables: root collar diameter (squared mean of two dominant stems), height (mean of two dominant stems) and number of epicormic stems. In the allometric model, the total aboveground biomass and the aboveground biomass by component were explained as the product of the mean square of the root collar diameter, mean height of the two dominant new sprouts and total number of epicormic sprouts as the predictive variable. Values of coefficient of determination (R2 ) ranged from 0.78 to 0.95 and RMSE ranged from 168 to 913 g. The species of E. globulus showed higher RMSE for biomass estimation in the all components except the branch component. The inclusion of dummy variables to identify the differences in each parameter of the models explained the seasonality of the biomass accumulation in tree sprouts at 10, 21, and 31 months of age, improving the model goodness of fit RMSE by 27%. Accurate prediction of sprouts aboveground biomass was obtained by the models only evaluating the two dominant epicormic sprouts in the stump, avoiding the need of individual sprouts evaluation or using destructive methods for biomass measurement.
    Źródło:
    Dendrobiology; 2021, 85; 19-29
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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