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Tytuł:
Mostki cieplne w murowanych ścianach wypełniających w budynkach szkieletowych - analiza przypadku
Heat brides in gel better building with filling with cellets - case analysis
Autorzy:
Krause, P.
Szymanowska-Gwiżdż, A.
Orlik-Kożdoń, B.
Steidl, T.
Powiązania:
https://bibliotekanauki.pl/articles/362581.pdf
Data publikacji:
2017
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
liniowy współczynnik przenikania ciepła
temperatura na wewnętrznej powierzchni przegrody
czynnik temperaturowy
linear thermal transmittance
internal wall surface temperature
temperature factor
Opis:
W artykule przedstawiono wybrany przykład występowania liniowego mostka cieplnego w budownictwie realizowanym w technologii szkieletu żelbetowego z wypełnieniem z betonu komórkowego. Została wykonana analiza obliczeniowa ocieplonego naroża ściany zewnętrznej o zróżnicowanych grubościach termoizolacji. Dla założonych wariantów obliczono wartości liniowych współczynników przenikania ciepła , oraz temperatury na wewnętrznych powierzchniach ścian. Temperatury obliczono w narożach jak i poza obszarem oddziaływania mostków termicznych oraz określono czynnik temperaturowy na powierzchni wewnętrznej. Wykazano, iż dla przegrody spełniającej wymagania, co do współczynnika przenikania ciepła U zgodnie z WT-2017, w miejscu szczególnym czynnik temperaturowy fRsi może nie spełniać stosownych wymagań, stwarzając zagrożenie ryzyka zagrzybienia.
The article presents a selected example of the presence of linear thermal bridges in construction technology implemented in the technology of reinforced concrete framework filled with cellular concrete. An analysis of the insulated corner of the outer wall with different thicknesses of thermal insulation was performed. For the assumed variants the values of the linear heat transfer coefficients and the internal wall surfaces were calculated. Temperatures were calculated in the corners as well as outside the area of thermal bridges and temperature was determined on the inner surface. It has been shown that for a baffle complying with the requirements for heat transfer coefficient U in accordance with WT-2017, in particular, the temperature factor fRsi may not meet the relevant requirements, posing a risk of mold infestation.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2017, T. 9, nr 2, 2; 13-18
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan cieplno-wilgotnościowy przegród budowlanych w modernizowanych obiektach zabytkowych
Thermal and humidity status of wall barriers in the modernized historical buildings
Autorzy:
Szymanowska-Gwiżdż, A
Powiązania:
https://bibliotekanauki.pl/articles/362959.pdf
Data publikacji:
2011
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
modernizacje obiektów zabytkowych
pleśnienie przegród budowlanych
czynnik temperaturowy
modernization of historical buildings
mould formation on the inner surface
temperature factor
Opis:
W artykule przedstawiono problematykę dotyczącą zmian warunków cieplno-wilgotnościowych, występujących w ceglanych obiektach zabytkowych, na skutek działań adaptacyjnych w budynkach i przystosowywania ich do różnych funkcji użytkowych. Dokonano analizy rozwiązań istniejących przegród zewnętrznych oraz ich modyfikacji pod kątem zagrożenia możliwością powstania pleśni na powierzchni wewnętrznej przegrody.
The article presents problems concerning changes of the thermal and humidity conditions In brick historic objects, on result of adaptation in buildings and their adjustments for different utilitarian functions. The article also analyses the solutions of existing outer barriers and their modifications in terms of the possibility of mould formation on the inner surface.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2011, T. 6, nr 3, 3; 73-76
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
The colonization of hot water systems by Legionella
Autorzy:
Hruba, L
Powiązania:
https://bibliotekanauki.pl/articles/50226.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Tematy:
Legionella pneumophila
hot water system
temperature effect
legislation
water temperature
building type
safety factor
Źródło:
Annals of Agricultural and Environmental Medicine; 2009, 16, 1; 115-119
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of meteorological factors on the radial growth of pine latewood in northern taiga
Autorzy:
Neverov, N.
Chistova, Z.
Mineev, A.
Powiązania:
https://bibliotekanauki.pl/articles/2106664.pdf
Data publikacji:
2022
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
late wood
pine
meteorological factor
air temperature
wind speed
taiga
Opis:
The purpose of this study is to evaluate the influence of day and night meteorological parameters (air temperatures and dew points, relative humidity, wind speed and precipitation) on the radial growth of pine latewood in northern taiga, in typical conditions of its growth. The study was conducted in the north of the Arkhangelsk region (Russia). A total of 63 cores were selected from seven most representative sites. Meteorological parameters were obtained from the WMR 918 H digital weather station (Huger GmbH, Germany), located directly on the study area and operating in monitoring mode. The analysis used meteorological data for the period 2008–2015. Correlation with night and day air temperature in June and July (0.72–0.77) was revealed in blueberry type. In all the stands studied, a reliable correlation with wind speed was established, direct (0.77‒0.88) and inverse (−0.7 to −0.99), but each sample plot had an individual dependence. A reliable correlation with the humidity of August and September (0.64–0.87) and an inverse correlation with precipitation in May and August (−0.63 to −0.75) were established. In general, pine in blueberry, cowberry and pine on swamp types have a similar reaction to the variability of meteorological factors, the most important of which is the temperature regime of air and wind speed.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 1; 7-14
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vlianie temperatury okruzausej sredy na velicinu eksergeticeskogo KPD glavnogo dvigatela
The Influence of Ambient Temperature on the Efficiency Factor of Main Engine Operation
Autorzy:
Behrendt, C.
Motornyj, A.
Powiązania:
https://bibliotekanauki.pl/articles/359702.pdf
Data publikacji:
2004
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
EXPLO-SHIP 2004
marine power plant
main engine
efficiency factor
ambient temperature
Opis:
The factor of thermal efficiency, used for the assessement of the use of heat in the diesel engine working cycles, has been based on the the first law of thermodynamics only. This paper indicates the fact that to achieve more comprehensive thermodynamic analyses it is necessary to use factors based on the two laws of thermodynamics. One such factor herein proposed is the exoergic efficiency. The method for the determination of this factor for the main engine is presented. Original relations involving the exoergic efficiency are set out. The factor depends on the ambient temperature.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 1 (73); 21-29
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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 effect of temperature and humidity on the grazing activity of Deroceras reticulatum (O. F. Muller, 1774) and the damage to rape plants
Autorzy:
Kozlowski, J.
Jaskulska, M.
Kaluski, T.
Kozlowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/83902.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
temperature effect
humidity
grazing activity
Deroceras reticulatum
damage
rape plant
winter rape
slug
yield loss
environmental factor
air temperature
Opis:
Winter rape is susceptible to damage caused by D. reticulatum (O. F. Müller) mainly in the early phases of the plants’ development. The degree of damage and the size of yield losses depend on the slug population and the grazing activity, which are governed by many environmental factors. Laboratory studies were performed to analyse the rate and amount of damage to rape plants (2–3 leaf stage) caused by D. reticulatum, and the effect of temperature and soil humidity on the slug’s grazing activity. With increasing air temperature (up to 16°C) the amount of damage increased, but the effect was not lasting. The slugs were also active at low temperatures (+1°C), and although their grazing was less intense, the amount of damage after seven days could reach an average of 34%. In laboratory tests, the soil humidity had no marked effect on the amount of damage done by the slugs.
Źródło:
Folia Malacologica; 2011, 19, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low temperature seed germination of cucumber: genetic basis of the tolerance trait
Autorzy:
Klosinska, U.
Kozik, E.U.
Nowicki, M.
Wehner, T.C.
Powiązania:
https://bibliotekanauki.pl/articles/1842.pdf
Data publikacji:
2013
Wydawca:
Instytut Ogrodnictwa
Tematy:
cucumber
Cucumis sativus
seed germination
low temperature
chilling
inheritance
genetic factor
cold tolerance
Źródło:
Journal of Horticultural Research; 2013, 21, 2
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deforestation and its impacts on climate change an overview of Pakistan
Autorzy:
Ali, A.
Riaz, S.
Iqbal, S.
Powiązania:
https://bibliotekanauki.pl/articles/11968.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
climate change
deforestation
Pakistan
catastrophic event
forest age
natural factor
weather
industrialization
urbanization
global temperature
surface temperature
disaster
South Asia
Opis:
Forests are one the main natural factors that regulate and determine climate, weather patterns and amount of CO2 of an area. With rapid industrialization and rapid urbanization there is a significant increase in deforestation and as a consequence rise in global mean surface temperatures. Rapid and unchecked cut down of forest cover has resulted in some of the worst disasters during the last decades. This paper focuses on studying the role of deforestation, its influence on climate change phenomena and its consequences in Pakistan.
Źródło:
Papers on Global Change; 2014, 21
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
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:
Symulacyjne badanie wpływu parametrów otoczenia na napełnienie cylindrów silnika spalinowego
Simulation research on environmental impact parameters for filling the cylinder engine
Autorzy:
Lisowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/134043.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
napełnienie
temperatura otoczenia
ciśnienie barometryczne
współczynnik korekcji
filling
ambient temperature
barometric pressure
correction factor
Opis:
W artykule przedstawiono wyniki oceny wpływu parametrów otoczenia (temperatury i ciśnienia) na napełnienie cylindrów silnika spalinowego. Dane do oceny wyznaczono na podstawie badań modelowych silnika o zapłonie samoczynnym. Masy powietrza zamknięte w przestrzeni roboczej cylindra, dla różnych wartości parametrów otoczenia, obliczono przy zastosowaniu modelu matematycznego opartego na równaniach Naviera-Stokesa. Symulacje wykonano całego zakresu prędkości obrotowych wału korbowego silnika. Wyniki badań modelowych zaprezentowano jako zależności współczynnika napełnienia w funkcji temperatury i ciśnienia otoczenia dla stałej prędkości obrotowej. Wyznaczone równania linii trendu stanowią tym samym zależność do obliczenia współczynnika korekcji dla współczynnika napełnienia.
The article presents the results of assessing the impact of environmental parameters (temperature and pressure) to fill a cylinder internal combustion engine. Data for the assessment determined on the basis of the model diesel engine. The masses of air enclosed in the working space of the cylinder, for different values of the environmental parameters were calculated using a mathematical model based on the Navier-Stokes. Simulations were performed throughout the speed range of the engine. Model results are presented as depending on the filling factor as a function of ambient temperature and pressure for constant speed. Designated trend line equation are the same relationship to calculate a correction factor for the fill factor.
Źródło:
Combustion Engines; 2015, 54, 3; 1065-1069
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
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:
Weather conditions as a risk factor in sewage system constructions
Autorzy:
Bondar-Nowakowska, E.
Rybka, I.
Powiązania:
https://bibliotekanauki.pl/articles/60724.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
sewage system construction
schedule risk
air temperature
precipitation
wind velocity
weather condition
risk factor
construction work
Opis:
Construction works in the open air, in particular laying sewage systems, are susceptible to weather conditions. Weather conditions, such as very high or low emperatures, strong winds, intense and prolonged precipitation, interfere with work and they can even lead to cessation of construction. In consequence, the construction work lasts longer than originally assumed. On the other hand, it is impossible to alter weather. Therefore, it is vital to conduct a thorough identification of threats related to adverse weather conditions. This work makes an attempt to determine basic relationship between adverse weather conditions and the possibility of completing construction work according to a schedule. This analysis is a part of Schedule Risk Assessment. The findings show that the frequency of adverse weather occurrence is high and it affects schedule risk with special regard to air temperatures below -5°C and above 25°C. Thus, before starting construction, the probability of adverse weather conditions should be considered. Accurate identification of weather factors during the planning phase may help in accumulation of adequate reserves. Therefore, any unavoidable circumstances that are forced by adverse weather seem to be allowed in the schedule. This work focuses on air temperature, precipitation and wind because of their greater impact on construction. The presented research covers one calendar year. The conducted analysis proves that adverse weather conditions during construction are risk triggers. To asses its true significance further research is needed, especially concerning longer time of observation.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2011, 12
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Distribution in a Steel Beam-to-Column Joint when Exposed to Fire. Part 2: Flange-Plates and Web-Cleats Joint
Autorzy:
Maślak, M.
Suchodoła, M.
Woźniczka, P.
Powiązania:
https://bibliotekanauki.pl/articles/104693.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
beam-to-column joint
flange-plates joint
web-cleats joint
temperature distribution
section factor
numerical simulation
Opis:
In the second part of this paper the temperature distribution is analysed for a thermally uninsulated steel beam-to-column flange-plates and web-cleats joint after 15 minutes of its exposure to a fully developed fire. Two types of such a joint are considered separately, firstly the pure steel connection with a beam and a column evenly heated on all four sides and then the analogous one, but with a massive reinforced concrete floor slab lying on the upper beam flange. In the latter case the joint beam is heated only on three sides. In addition, in each of the analysed joint the beams of two sizes are analysed independently for comparative purposes. Those that are made of the bigger I-section have a more slender web, while the smaller ones are more stocky. However, the smaller I-section heats faster than the bigger one because the section factor calculated for it has a greater value. In general, it can be concluded that in all the joints considered by the authors the steel temperature turned out to be much lower than that measured outside these joints. Moreover, a significant difference is observed in the temperature values identified in the beam web and in the beam flanges. Finally, the temperature distribution obtained from a numerical simulation and identified in the selected cross-sections of the joint beam in the case of a joint with adjacent floor slab is referred to the analogous distribution recommended for use in such circumstances in the standard EN 1993-1-2.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 103-114
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dependence of the photosynthesis quantum yield in oceans on environmental factors
Autorzy:
Wozniak, B.
Dera, J.
Ficek, D.
Ostrowska, M.
Majchrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/48279.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
primary production
water temperature
quantum yield
environmental factor
bio-optical modelling
nutrient content
phytoplankton
chlorophyll
irradiance
photosynthesis
Opis:
Statistical relationships between the quantum yield of photosynthesis and selected environmental factors in the ocean have been studied. The underwater irradiance, nutrient content, water temperature and water trophicity (i.e. the surface concentration of chlorophyll Ca(0)) have been considered, utilizing a large empirical data base. On the basis of these relationships, a mathematical model of the quantum yield was worked out in which the quantum yield Φ is expressed as a product of the theoretical maximum quantum yield ΦMAX = 0.125 atomC quanta−1 and six dimensionless factors. Each of these factors fi appears to be, to a sufficiently good approximation, dependent on one or two environmental factors and optical depth at most. The model makes it possible to determine the quantum yield from known values of these environmental factors. Empirical verification of the model yielded a positive result – the statistical error of the approximate values of the quantum yield Φ is 42%.
Źródło:
Oceanologia; 2002, 44, 4
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
Tytuł:
Implementation of improved application for determining gas Z-factor of gas from the Molve field
Zastosowanie poprawek do obliczania współczynnika Z dla gazu na przykładzie złoża Molve
Autorzy:
Juttner, I.
Vulin, D.
Lazo, A.
Powiązania:
https://bibliotekanauki.pl/articles/300287.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
współczynnik Z
równanie stanu
pseudokrytyczne wartości temperatury i ciśnienia
Z-factor
equation of state
pseudocritical pressure and temperature
Opis:
Separator gas composition and separator liquid composition and corresponding standard data (pressure, temperature, liquid density, specific gravity etc.) were measured to obtain recombined fluid composition. The results of separator gas test and recombined wellstream were grouped and observed separately to verify published methods of compressibility correction factor, Z prediction. It was found that Dranchouk-Abu-Kassem method is in good correlation with laboratory data. Critical properties of separator gas and wellstream fluid mixtures, and also C7+ fractions were correlated using a number of published correlations. The properties were found to be similar to that found in literature, characterized by an accuracy decrease with decreasing molar weight accuracy of plus the fractions. However, individual pressure vs. Z-factor curves for each observed laboratory fluid analysis, calculated using the correlations, showed acceptable match with measured and then calculated pressure versus Z data. Modified correlation was made, similar to Sutton's and Standing's correlations for calculating pseudocritical temperature and pressure as function of specific gravity and compared to published correlations.
W pracy dokonano pomiaru skład gazu i płynu w separatorze oraz standardowe dane dotyczące ciśnienia, temperatury, gęstości cieczy, ciężaru właściwego w celu ustalenia nowego składu płynu. Zestawiono wyniki badania składu gazu z separatora i nowy skład strumienia, a następnie zweryfikowano opublikowane metody korekcji współczynnika ściśliwości Z. Wykazano korelację metody Dranchouk-Abu-Kassem z danymi laboratoryjnymi. Wykorzystując znane z literatury metody, skorelowano krytyczne właściwości gazu z separatora, mieszaniny płynu w otworze oraz cząstki C7+. Otrzymane właściwości były podobne do przedstawionych w literaturze i charakteryzowały się spadkiem dokładności wraz ze spadkiem dokładności ciężaru molowego cząstek dodatnich. Z analizy krzywej funkcji ciśnienia i współczynnika Z dla każdego z płynów badanych na podstawie korelacji wynika, że uzyskano akceptowalną zgodność z danymi pomiarowymi i następnie obliczono funkcję ciśnienia i współczynnika Z. Zmodyfikowano korelację, analogicznie do korelacji Suttona i Standinga na pseudokrytyczne wartości temperatury i ciśnienia jako funkcji ciężaru właściwego, a następnie porównano i przestawiono otrzymane korelacje.
Źródło:
Wiertnictwo, Nafta, Gaz; 2008, 25, 2; 323-330
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Benthic Crustacea and Mollusca distribution in Arctic fjord - case study of patterns in Hornsund, Svalbard
Autorzy:
Drewnik, A.
Weslawski, J.M.
Wlodarska-Kowalczuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/48672.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
species distribution
benthos
Mollusca
Crustacea
distribution
Arctic fjord
environmental factor
benthic species
bottom water
water temperature
Hornsund Region
Svalbard
Opis:
We present the results of species distribution modeling conducted on macrobenthic occurrence data collected between 2002 and 2014 in Arctic fjord – Hornsund. We focus on species from Mollusca and Crustacea taxa. This study investigates the importance of individual environmental factors for benthic species distribution, with a special emphasis on bottom water temperature. It aims to verify the hypothesis that the distribution of species is controlled by low water temperatures in the fjord and that the inner basins of the fjord serve as potential refugia for Arctic species threatened by the climate change-related intensification of warmer water inflows. Our results confirm the importance of bottom water temperature in regulating the presence of benthic fauna in the Hornsund fjord. The distribution of studied species is clearly related to specific water mass – colder (<1°C) or warmer (>1°C); and the preferred temperature regimes seem to be species specific and unrelated to analyzed groups. This study supports the notion that inner basins of the Hornsund fjord are potential refugia for cold water Arctic fauna, while the outer and central basins provide suitable habitats for fauna that prefer warmer waters.
Źródło:
Oceanologia; 2017, 59, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Association between incidence of Lyme disease and spring-early summer season temperature changes in Hungary - 1998-2010
Autorzy:
Trajer, A.
Bobvos, J.
Paldy, A.
Krisztalovics, K.
Powiązania:
https://bibliotekanauki.pl/articles/50739.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Tematy:
association
Lyme disease
spring-early summer season
temperature change
Hungary
1998–2010 period
climate change
indicator species
host animal
environmental factor
Opis:
The increase of Lyme borreliosis (LB) can be expected due to climate change, while the distribution of the disease and annual activity of the vector and host animals depend on several factors of the environment. The presented study aimed to assess expressly the spring season temperature dependence on the incidence of LB in Hungary. The weekly LB data were obtained from the National Epidemiologic and Surveillance System for a period of 13 years – 1998–2010. Daily temperature data were derived from the European Climate Assessment and Dataset. The association was studied at national level, descriptive statistics and linear regression models were applied. A significant increasing trend was observed in the mean temperature of the analysed years (0.052 °C per year). The annual LB incidence doubled during the 13 year period. The incidence rates of the periods 1998–2001 and 2007–2010 were 11.1 resp. 17.0 per 100,000. The start of a steep increase in weekly LB incidence (0.1 per 100,000) shifted significantly by 3 weeks earlier, the start date of spring showed similar trend (p=0.0041). LB incidence increased more steadily in spring than in summer, with 79% of the increase being reported during weeks 15–28, with maximum rates of increase occurring in weeks 23–25. The trend was significant between the weeks 15–28. In the warmer years with 19.02 °C mean temperature in May and June, the LB incidence curve reached the annual peak 2–3 weeks earlier, and the descending phase of the curve started earlier than in the colder years with 17.06 °C of the same period.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of bacterial production in the water column between two Arctic fjords, Hornsund and Kongsfjorden (West Spitsbergen)
Autorzy:
Ameryk, A.
Jankowska, K.M.
Kalinowska, A.
Weslawski, J.M.
Powiązania:
https://bibliotekanauki.pl/articles/47914.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
bacterial production
environmental factor
water column
chlorophyll a
water temperature
bacterial biomass
dissolved organic carbon
dissolved organic matter
Arctic fjord
Spitsbergen
Kongsfjorden
Hornsund
Opis:
Bacterial production and the accompanying environmental factors were measured in the water columns of two Arctic fjords during the cruise in July and August 2013. Water samples were collected at six stations located in the central part of Hornsund and Kongsfjorden. In Hornsund, where average water temperatures were 1.25-fold lower than in Kongsfjorden, the bacterial production was twice as high (0.116 ± 0.102 vs 0.05 ± 0.03 mg C m−3 h−1). Statistical analysis indicated that chlorophyll a concentration itself was not a significant factor that affected bacterial production, in contrast to its decomposition product, pheophytin, originating from senescent algal cells or herbivorous activity of zooplankton. Single and multiple regression analysis revealed that water temperature, dissolved organic carbon (DOC), and pheophytin concentration were the main factors affecting bacterial production in both fjords.
Źródło:
Oceanologia; 2017, 59, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza statystyczna wplywu czynnikow meteorologicznych i glebowych na wartosc temperatury radiacyjnej powierzchni roslin
The statistical analysis of meteorological and soil parameters impact on plant cover radiation temperature
Autorzy:
Mazurek, W
Walczak, R.T.
Baranowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1401778.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
rosliny
powierzchnia roslin
temperatura radiacyjna
czynniki meteorologiczne
czynniki glebowe
woda glebowa
stres wodny
analiza statystyczna
regresja wielokrotna
plant
plant surface
radiation temperature
meteorological factor
soil factor
soil water
water stress
statistical analysis
multiple regression
Opis:
W pracy dokonano analizy statystycznej metodą regresji wielokrotnej wpływu czynników meteorologicznych i glebowych na wartości temperatury radiacyjnej pokrywy roślinnej. Stwierdzono, iż wprowadzenie do modelu regresji wielokrotnej potencjału wody glebowej jako zmiennej niezależnej poprawia dokładność predykcyjną modelu w przypadku, gdy zmienną zależną jest różnica temperatury pokrywy roślinnej w sytuacji stresu wodnego i przy nieograniczonej dostępności wody glebowej. Przedstawiono zależność temperatury powierzchni roślin od temperatury powietrza, prędkości wiatru, radiacji słonecznej i potencjału wody glebowej.
In this study the statistical analysis was performed, using the multiple regression, of the impact of meteorological and soil parameters on radiation temperature of plant cover. It was stated that including into the model soil water potential as an independent variable of multiple regression, improves its predictive precision in case when the dependent variable is the difference of crop temperature in the conditions of water stress and under unlimited availability of soil water. The relation between crop temperature and air temperature, wind speed, solar radiation and soil water potential is presented.
Źródło:
Acta Agrophysica; 2000, 38; 157-164
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of environmental factors on reproduction of polar vascular plants
Autorzy:
Kellmann-Sopyla, W.
Pastorczyk, M.
Gielwanowska, I.
Powiązania:
https://bibliotekanauki.pl/articles/11942.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environmental factor
plant reproduction
polar plant
vascular plant
climate change
generative reproduction
warming
flower development
seed formation
air temperature
ultraviolet radiation
reproductive phase
vegetation
Opis:
In the last few decades, changes of reproductive pattern of polar vascular plants have been observed, for the benefit of generative propagation. The reasons for this phenomenon are attributed to intensively following climate change, whose effects may be various. Warming causes the production of the greater number of generative structures, with higher quality. Our macroscopic observations conducted on specimens of polar vascular plants, cultivated in University of Warmia and Mazury greenhouse, indicate that the effect of temperature increase on flower development and seed formation is inconsistent. On the other hand enhanced levels of UV-B radiation can negatively affect seedlings. The complexity of the climate change causes tremendous difficulties in defining a clear and unquestioned way of modifications during the reproductive phase of the described plants.
Źródło:
Papers on Global Change; 2011, 18
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 30

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