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Wyszukujesz frazę "environmental variation" wg kryterium: Temat

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Research of the biodegradability of degradable/biodegradable plastic material in various types of environments
    Autorzy:
    Adamcova, D.
    Radziemska, M.
    Fronczyk, J.
    Zloch, J.
    Vaverkova, M.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/887238.pdf
    Data publikacji:
    2017
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    biodegradability
    degradable plastic
    biodegradable plastic
    plastic material
    environmental variation
    composting
    landfill condition
    Opis:
    Research of the biodegradability of degradable/biodegradable plastic material in various types of environments. Research was carried out in order to assess biodegradability of degradable/biodegradable materials made of HDPE and mixed with totally degradable plastic additive (TDPA additive) or made of polyethylene (PE) with the addition of pro-oxidant additive (d2w additive), advertised as 100% degradable or certified as compostable within various types of environments. Research conditions were: (i) controlled composting environment – laboratory-scale, (ii) real composting conditions – domestic compost bin, (iii) real composting conditions – industrial composting plant and (iv) landfill conditions. The results demonstrate that the materials made of HDPE and mixed with totally degradable plastic additive (TDPA additive) or made of polyethylene (PE) with the addition of pro- -oxidant additive (d2w additive) or advertised as 100% degradable did not biodegrade in any of the above-described conditions and remained completely intact at the end of the tests. Biodegradation of the certified compostable plastic bags proceeded very well in laboratory-scale conditions and in real composting conditions – industrial composting plant, however, these materials did not biodegrade in real composting conditions – domestic compost bin and landfill conditions.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2017, 26, 1[75]
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatio-temporal variability in the Brazil-Malvinas Confluence Zone (BMCZ), based on spectroradiometric MODIS-AQUA chlorophyll-a observations
    Autorzy:
    Telesca, L.
    Pierini, J.O.
    Lovallo, M.
    Santamaria-del-Angel, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/48518.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    confluence zone
    environmental variation
    sea water
    phytoplankton
    spatio-temporal variability
    chlorophyll a
    ocean colour
    remote sensing
    Opis:
    The Brazil–Malvinas Confluence Zone (BMCZ) is characterized by high environmental variation, which could be reflected in several optical types of water, from one containing only phytoplankton and sea water to other optically more complex. In this paper, we analyze the spatio-temporal variability of the Chlorophyll-a detected by the ocean color sensor (CHLAsat) in BMCZ in order to understand its environmental variability. We use the MODIS-Aqua CHLAsat monthly composites imagery from 2002 to 2015, and applied two statistical methods: the correlogram-based robust periodogram to identify, over a broad spectrum of temporal, the most significant periodicities, and the pixel gradient distribution to study the spatial-temporal gradients within the BMCZ and variations over the continental shelf and coastal waters. Our results point out to the predominance of the annual cycle over most of the investigated area, although an area from latitude 37°S in direction NE, alongshore of Uruguay to Brazil, evidences interannual periodicities, possibly related to variations in the discharge of the Rio de la Plata associated with the El Niño phenomena. The ocean color spectroradiometric signature in terms of pixel gradient presents a relatively high variability (∼0.0 to 0.65 mg m−3); in particular the high values of the pixel gradient correspond to saline front of the estuarine system of Rio de la Plata, and to the strip of the platform that extends along the isobaths of 80 m (coast of Uruguay), especially in the center and south of the study area.
    Źródło:
    Oceanologia; 2018, 60, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Handling ambient temperature changes in correlative thermal error compensation
    Autorzy:
    Naumann, Christian
    Geist, Alexander
    Putz, Matthias
    Powiązania:
    https://bibliotekanauki.pl/articles/28407326.pdf
    Data publikacji:
    2023
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tool
    thermal error
    correlative compensation model
    ambient effect
    ETVE
    environmental temperature variation error
    Opis:
    Thermal errors are one of the leading causes for positioning inaccuracies in modern machine tools. These errors are caused by various internal and external heat sources and sinks, which shape the machine tool’s temperature field and thus its deformation. Model based thermal error prediction and compensation is one way to reduce these inaccuracies. A new composite correlative model for the compensation of both internal and external thermal effects is presented. The composite model comprises a submodel for slow long- and medium-term ambient changes, one for short-term ambient changes and one for all internal thermal influences. A number of model assumptions are made to allow for this separation of thermal effects. The model was trained using a large number of FE simulations and validated online in a five-axis machine tool with measurements in a climate chamber. Despite the limitations, the compensation model achieved good predictions of the thermal error for both normal ambient conditions (21°C) and extreme ambient conditions (35°C).
    Źródło:
    Journal of Machine Engineering; 2023, 23, 4; 43--63
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intradiurnal variations of allergenic tree pollen in the atmosphere of Toledo [Central Spain]
    Autorzy:
    Perez-Badia, R
    Vaquero, C.
    Sardinero, S.
    Galan, C.
    Garcia-Mozo, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/50438.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    environmental exposure
    Spain
    Toledo city
    tree pollen
    allergenic pollen
    atmosphere
    aerobiology
    atmospheric pollen
    meteorology
    intradiurnal variation
    allergy
    human disease
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2010, 17, 2; 269-275
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variability of Juniperus communis subsp. communis based on phenolics accumulation and glucosidase activity
    Autorzy:
    Kozlowska, M
    Bednorz, L.
    Grzeskowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41569.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    juniper
    Juniperus communis ssp.communis
    variability
    needle
    berry-like cone
    environmental variability
    phenolics accumulation
    glucosidase activity
    enzyme activity
    beta-glucosidase activity
    morphological variation
    Opis:
    Four populations of J. communis L. subsp. communis of natural localities in forested regions of the Bory Tucholskie (Poland) were analysed in respect of phenolic compounds concentration and –glucosidase activity. The variability noted in needles was confirmed by adaptation changes; water-logged and poor insolated localities (deciduous mixed fresh forest, dmff – no 3 and coniferous mixed bog forest, cmbf – no 4) stimulated the phenolics accumulation and enzyme activity. On the contrary, the level of phenolics in unripe berry-like cones was almost two fold lower under disadvantageous juniper growth and fructification conditions, whereas the mature berries from poor vigour plants were characterized by higher concentrations of these metabolites. Obtained results show that morphological variation of juniper population was accompanied by variability in phenolic metabolism.
    Źródło:
    Dendrobiology; 2005, 54; 29-33
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of grass cover and tillage on temperature of soil in sloping vineyard
    Autorzy:
    Ferrero, A.
    Sudiro, L.
    Nosalewicz, A.
    Lipiec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/24929.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    traditional tillage
    tillage
    chemical process
    environmental regulator
    physical process
    temperature
    plant root
    soil
    vineyard
    nutrient availability
    sloping vineyard
    soil temperature
    grass cover
    temperature variation
    Źródło:
    International Agrophysics; 2004, 18, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Variation in size-dependent fitness components in a terrestrial orchid, Dactylorhiza majalis (Rchb.) Hunt et Summerh., in relation to environmental factors
    Autorzy:
    Mroz, L.
    Kosiba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/57438.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    variation
    size-dependent fitness component
    terrestrial orchid
    orchid
    Dactylorhiza majalis
    environmental factor
    European orchid
    total leaf area
    plant size
    flowering probability
    flower production
    threshold size
    plant reproduction
    leaf area
    meadow site
    Polska
    soil nutrient
    plant population
    Opis:
    We investigated the flowering probability and flower production in relation to plant size in a terrestrial orchid, Dactylorhiza majalis at 10 meadow sites in central and southwestern Poland. These sites differed in altitude (low, high) and management (presence or absence of mowing). At all sites, concentrations of nutrients in the soil were also measured. The probability of flowering increased significantly with the size of the plant in all populations, indicating that individuals do not flower until they reach a threshold size. Populations at high altitudes and the unmown sites had significantly lower threshold sizes for reproduction and showed sharp increase in flowering probability with plant size, compared to other populations. The threshold sizes for reproduction tended to decrease at sites rich in N and Mg and poor in P and S. Flower production was also size-dependent in all populations. Considerable between-site differences were found in the slope and the intercept of the regression between plant size and flower production. Flower production at some sites, at high altitudes, increased more steeply with plant size than at other sites. However, no pattern in size-dependent flower production was found relative to the measured environmental variables. Most of the size-dependent components of flowering probability were related to each other but not with the size-dependent flower production.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2011, 80, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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