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Wyszukujesz frazę "temperature factor" wg kryterium: Temat

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    Wyświetlanie 1-7 z 7
    Tytuł:
    The influence of temperature on the damping characteristic of hydraulic shock absorbers
    Autorzy:
    Hryciów, Zdzisław
    Rybak, Piotr
    Gieleta, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/1841747.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    hydraulic shock absorber
    performance
    damping factor
    temperature
    dissipation energy
    Opis:
    This paper presents the results of bench-tests and calculations assessing the influence of temperature on the performance of a two-pipe hydraulic shock absorber. The shock absorber prepared for the tests was cooled with dry ice to a temperature corresponding to that associated with the average winter conditions in a temperate climate. The temperature range of the shock absorber during testing was ensured via equipping it with a thermocouple and monitoring it with a thermal imaging camera. During testing, the shock absorber was subjected to kinematic forces of a selected frequency with two different, fixed displacement amplitudes. The results of the tests showed a direct correlation between the decrease of component resistance at lower temperatures. The rate of change in resistance was higher at lower temperatures. It was also found that the energy dissipated in one shock cycle decreased linearly with an increasing temperature. Finally, a method for determining the ideal use temperature of the shock absorber for the assumed operating conditions was also presented.
    Źródło:
    Eksploatacja i Niezawodność; 2021, 23, 2; 346-351
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of selected abiotic factors on the decomposition of chlorophylls
    Autorzy:
    Kowalewska, G.
    Szymczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48301.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    chlorophyll
    temperature
    abiotic factor
    blue-green alga
    Anabaena variabilis
    beta-carotene
    decomposition
    Opis:
    The paper presents the results of experiments to determine the influence of selected physico-chemical factors – oxygen, visible light and temperature – on the decomposition of (1) chlorophylls a, b and c, chlorophyll a derivatives and β-carotene in acetone solution, and (2) chlorophyll a and β-carotene in axenic cultures of the blue-green algae Anabaena variabilis. The results indicate that both in acetone extracts and in blue-green algae cultures these pigments were most sensitive to light and oxygen; temperatures of up to 25◦C had no marked influence on these compounds. Under anoxia in acetone solution, the stability towards light decreased in the order chlorophyll a, chlorophyll b, chlorophylls c. Chlorophyll a, moreover, was less stable than its derivatives – phaeophorbides, phaeophytins, pyrophaeophytins and steryl chlorins – but more stable than β-carotene, in the last case also in the blue-green algae cultures. Decomposition of all the pigments proceeded mainly via the breakdown of the porphyrin macrocycle, since the decomposition products were not detected in the VIS range. On the basis of these experiments one can state that while light and oxygen may have a decisive direct influence on the distribution of chlorophylls and β-carotene in sediments, in the natural environment, temperatures of up to 25◦ C may have very little immediate effect.
    Źródło:
    Oceanologia; 2001, 43, 3; 315-328
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of environmental factors on employee comfort based on an example of location temperature
    Wpływ czynników środowiskowych na komfort pracowników na przykładzie temperatury otoczenia
    Autorzy:
    Szer, I.
    Błazik-Borowa, E.
    Szer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/231316.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    warunki pracy
    czynnik środowiskowy
    rusztowanie
    bezpieczeństwo
    temperatura
    work conditions
    environmental factor
    scaffolding
    safety
    temperature
    Opis:
    Work in unfavorable, changing environmental conditions negatively affects people working on scaffoldings used on construction sites, which may increase the risk of occurrence of dangerous situations. The purpose of this article is to show the scale of temperature changes which workers are exposed to. The paper compares examples of temperature measurements obtained from a metrological station and during tests on scaffoldings located in the Lodz and Warsaw regions. This article also presents the methodology of examining environmental parameters of the surroundings where employees work on scaffoldings. Analysis results show that high temperatures and significant temperature variations frequently occur on the scaffoldings, which leads to a lack of adaptability and consequently to tiredness or decreased alertness. Unfavorable environmental conditions can lead to behaviors which, in turn, can cause accidents.
    Praca w niekorzystnych, zmieniających się warunkach środowiskowych, oddziałuje niekorzystnie na osoby pracujące na rusztowaniach, wykorzystywanych na budowach, mogąc zwiększać ryzyko wystąpienia sytuacji niebezpiecznych. Celem artykułu jest prezentacja wpływu temperatury na komfort pracy osób, pracujących na rusztowaniach. Wprowadzono założenie uproszczające, tzn. przyjęto, że temperatura jest głównym czynnikiem, wpływającym na komfort pracy oraz niezależnym od innych. Do dalszej analizy wybrano przede wszystkim dane wykonane przez IMGW (Instytut Meteorologii i Gospodarki Wodnej) oraz własne pomiary temperatury na rusztowaniach. W tym celu uzyskano z IMIGW (strona internetowa ogimet.com) wyniki pomiarów temperatury dla tych samych przedziałów czasowych, w których badane były rusztowania, ze stacji badawczych zlokalizowanych odpowiednio w Łodzi i Warszawie z lat 2012-2016. Główna grupa danych to wyniki pomiarów temperatury na rusztowaniu. Na dziesięciu rusztowaniach wykonano pomiary temperatury, w tym pięć w Łodzi i pięć w Warszawie lub miastach sąsiadujących z Warszawą. Pomiary wykonywano od kwietnia do sierpnia 2016 roku. Seria pomiarów na jednym rusztowaniu obejmowała pomiary przez pięć dni od poniedziałku do piątku w godz. 8.00, 11.0 i 14.00, nazywanych porami dnia, na różnych poziomach rusztowania. Pomiar w pierwszym punkcie rozpoczynał się o danej godzinie. Pomiary parametrów środowiskowych wykonywane były w czterech, sześciu, dziewięciu lub dwunastu miejscach na rusztowaniu w zależności od szerokości i wysokości rusztowania oraz od dostępności.
    Źródło:
    Archives of Civil Engineering; 2017, 63, 3; 163-174
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contrasting zooplankton communities (Arctic vs. Atlantic) in the European Arctic Marginal Ice Zone
    Autorzy:
    Blachowiak-Samolyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/47495.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    zooplankton community
    Arctic water
    Fram Strait
    temperature
    Barents Sea
    Atlantic water
    salinity
    environmental factor
    Opis:
    Relationships between the zooplankton community andv arious environmental factors (salinity, temperature, sampling depth and bottom depth) were established in the European Arctic Marginal Ice Zone (MIZ) using multivariate statistics. Three main zooplankton communities were identified: an Atlantic Shallow Community (AtSC), an Arctic Shallow Community (ArSC) anda Deep Water Community (DWC). All species belonging to AtSC andArSC were pooledandtheir relative abundances in the total zooplankton calculated with respect to a particular layer (surface, midan dd eep strata), regions (the Barents Sea, Fram Strait andt he waters off northern Svalbard), years (1999 or 2003) and seasons (spring or autumn). Mapping of the proportions of Arctic andA tlantic species ledto the conclusion that zooplankton from the MIZs do not exactly follow complementary water masses, although the general pattern of AtSC and ArSC dominance accords with the physical oceanography of the study area (AtW and ArW respectively). The mid layer proved to be a better predictor of mesozooplankton distribution than the unstable conditions near the surface.
    Źródło:
    Oceanologia; 2008, 50, 3; 363-389
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution and role of the genus Oithona (Copepoda: Cyclopoida) in the South China Sea
    Autorzy:
    Wang, L.
    Du, F.
    Wang, X.
    Li, Y.
    Ning, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/47786.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Oithona
    Copepoda
    Cyclopoida
    temperature
    hydrological factor
    phytoplankton
    ichthyoplankton
    South China Sea
    Oithona plumifera
    Oithona similis
    Opis:
    The relationships between the small cyclopoid copepod Oithona and hydrological factors, phytoplankton and ichthyoplankton were evaluated using the data obtained in the central South China Sea (SCS) in summer 2014. The genus abundance ranged from 6.00 ind. m3 to 93.75 ind. m3 with high abundance band occurring in the branch of SCS Monsoon Jet. The lower temperature and higher salinity in the surface water of the band than other zones indicated that deep water intrusion was a positive factor for aggregation of the genus. The community structure of the genus was dominated by Oithona plumifera and Oithona similis made up 97% of the genus abundance associated with Oithona tenuis. The result of db-RDA analysis showed that the community structure of the genus was affected by temperature, Chl a, larval fishes and fish spawns, and temperature was the most important limiting factor. The result of GAMs analysis showed that abundance of O. tenuis, and copepodites were affected by Chl a, larval fishes and fish spawns; abundance of O. similis was affected by Chl a and fish spawns; and abundance of O. plumifera was affected by Chl a and larval fishes. Therefore, we suggest that the branch of SCS Monsoon Jet and deep water intrusion favor aggregation of plankton in the central SCS in summer. We confirm that the temperature is the limiting factor to the reproduction of the genus Oithona in tropic seas and the genus Oithona is a food-web linker between primary production and larval fishes in the central SCS.
    Źródło:
    Oceanologia; 2017, 59, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seed germination and emergence of Eragrostis tenuifolia (A. Rich.) Hochst. ex Steud. in response to environmental factors
    Autorzy:
    Bittencourt, H.H.
    da Silva Bonome, L.T.
    de Bortoli Pagnoncelli,Jr, F.
    Lana, M.A.
    Muzell Trezzi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65859.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    seed germination
    emergence
    Eragrostis tenuifolia
    elastic grass
    weed
    plant response
    environmental factor
    irradiance
    temperature
    weed ecology
    weed number
    Opis:
    Eragrostis tenuifolia is a weed species that is gaining ground in Brazil. This weed occurs in pastures, grasslands, crop fields, and roadsides. The objective of this study was to examine the effects of different environmental factors on E. tenuifolia seed germination and seedling emergence. The optimum constant temperature for germination was around 35–30°C. It was also found that 85% of seeds germinated under a 30/20°C alternate temperature regime. Light appears to have a positive effect on seed germination. No seedlings emerged when seeds were buried 3 cm or deeper. The results suggested that E. tenuifolia has the potential to spread into pastures and in no-tillage crop systems in Brazil. Measures such as the use of cover crops and/or soil cultivation can be used to limit germination and seedling emergence, respectively.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth responses of Picea abies to climate in the central part of the Ceskomoravska Upland (Czech Republic)
    Autorzy:
    Rybnicek, M.
    Cermak, P.
    Zid, T.
    Kolar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/41537.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    growth response
    Picea abies
    Norway spruce
    precipitation
    temperature
    climate
    environmental factor
    tree ring
    biomass
    Ceskomoravska Upland
    Czech Republic
    Opis:
    The aims of the study were to determine the effect of temperatures and precipitation on the ring width and to compare the results with the results of previous studies conducted in other mountain ranges of the Czech Republic. The research was performed in the central part of the Ceskomoravská Upland in the vicinity of Herálec municipality in selected 70- up to 110-year-old spruce stands at altitudes from 680ma.s.l. to 779 m a.s.l. Measuring of tree-ring widths and synchronization of individual ring series were conducted in PAST4. The age trend was removed by ARSTAN and climatic effects were modelled in DendroClim2002. The correlation of tree-ring width with monthly precipitation is positive and statistically significant for July of the previous year and for the entire summer period from June to September of the current year. The correlation of tree-ring width with mean monthly temperatures is negative and statistically significant for July and September and positive and statistically significant for October of the previous year. Negative correlation was also found for temperatures of the entire summer period from June to September of the previous year. The regional tree-ring chronology mainly shows two periods of highly reduced increment: from 1992 to 1996 and from 2003 to the end of the analysed period. The results thus confirm the hypothesis that the tree-ring width is in positive correlation with summer precipitation and negative correlation with summer temperatures. Also the results of the habitual diagnostics have shown a relatively low degree of crown transformation which indicates a weak or short-term stress load.
    Źródło:
    Dendrobiology; 2012, 68
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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