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Tytuł:
Allelopathic effect of goosefoot on germination and early stage growth of triticale and radish
Allelopatyczny wpływ komosy białej na kiełkowanie i wczesne stadia wzrostu pszenżyta i rzodkiewki
Autorzy:
Lipniak, Katarzyna
Kliszcz, Angelika
Powiązania:
https://bibliotekanauki.pl/articles/2175240.pdf
Data publikacji:
2020-11-12
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
fresh and dry mass
seed germination indexes
electrolyte leakage
relative water content
świeża i sucha masa
wskaźniki kiełkowania nasion
wyciek elektrolitu
względna zawartość wody
Opis:
The aim of this study was to investigate the effect of aqueous extracts from Chenopodium album L. on germination and early stages of triticale grains (×Triticosecale Wittm. ex A.Camus) and radish seeds (Raphanus sativus L.). Germination indexes, fresh and dry mass, water content and electrolyte leakage were measured. Studies revealed the different germination capacity of triticale grains and radish seeds, where increased concentrations of allelopathins in aqueous C. album extracts significantly inhibited seedling growth for both species. The extracts had an inhibitory effect on the growth of seedling fresh mass. An increase in dry mass of radish seedlings was demonstrated for each of the extracts and, for triticale seedlings, only at concentrations of 0.5% and 1.5%. Water content in triticale and radish seedlings varied depending on the concentration of allelopathins in the extract. With increasing concentrations of C. album extract, regardless of seedling type, a statistically significant increase in electrolyte leakage was observed.
Celem pracy było zbadanie wpływu wyciągów wodnych z Chenopodium album L. na kiełkowanie oraz wczesne stadia wzrostu ziarniaków pszenżyta (×Triticosecale Wittm. ex A.Camus) i nasion rzodkiewki (Raphanus sativus L.). Wyznaczono wskaźniki kiełkowania, świeżą i suchą masę, zawartość wody oraz wyciek elektrolitów. Badania wykazały różną zdolność kiełkowania ziaren pszenżyta i nasion rzodkiewki – wraz ze wzrostem stężeń substancji allelopatycznych zawartych w wodnych ekstraktach z C. album obserwowano znaczne zahamowanie wzrostu siewek obydwu gatunków. Wodne wyciągi hamowały przyrost świeżej masy siewek. Natomiast przyrost suchej masy siewek rzodkiewki wykazano przy każdym z ekstraktów, a dla pszenżyta jedynie w stężeniach 0,5% i 1,5%. Zawartość wody w siewkach pszenżyta i rzodkiewki była zróżnicowana, w zależności od stężenia allelopatin w ekstrakcie. Wraz ze wzrostem stężenia ekstraktów C. album, niezależnie od rodzaju siewek, zaobserwowano statystycznie istotny wzrost wycieku elektrolitów.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis Studia Naturae; 2020, 5; 110-128
2543-8832
2545-0999
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis Studia Naturae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental and numerical study of supercavitating flows around axisymmetric cavitators
Autorzy:
Javadpour, S. M.
Farahat, S.
Ajam, H.
Salari, M.
Nezhad, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/949307.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
natural cavitation
mass transfer
water tunnel
finite element method
drag coefficient
axisymmetric cavitators
Opis:
It has been shown that developing a supercavitating flow around under-water projectiles has a significant effect on their drag reduction. As such, it has been a subject of growing attention in the recent decades. In this paper, a numerical and experimental study of supercavitating flows around axisymmetric cavitators is presented. The experiments are conducted in a semi-open loop water tunnel. According to the Reynolds-Averaged Navier-Stokes equations and mass transfer model, a three-component cavitation model is proposed to simulate the cavitating flow. The corresponding governing equations are solved using the finite element method and the mixture Rayleigh-Plesset model. The main objective of this research is to study the effects of some important parameters of these flows such as the cavitation number, Reynolds number and conic angle of the cavitators on the drag coefficient as well as the dimensions of cavities developed around the submerged bodies. A comparison of the numerical and experimental results shows that the numerical method is able to predict accurately the shape parameters of the natural cavitation phenomena such as cavity length, cavity diameter and cavity shape. The results also indicate that the cavitation number declines from 0.32 to 0.25 leading to a 28 percent decrease in the drag coefficient for a 30° cone cavitator. By increasing the Reynolds number, the cavity length is extended up to 322% for a 60° cone cavitator.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 795-810
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An overview of the teta - S correlations in Fram Strait based on the MIZEX 84 data
Autorzy:
Schlichtholz, P.
Houssais, M.N.
Powiązania:
https://bibliotekanauki.pl/articles/47520.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
temperature
Fram Strait
Atlantic water
hydrographic cast
MIZEX 84 experiment
teta-S diagram
water mass
salinity
Arctic Ocean
Opis:
The water masses in Fram Strait have been analyzed on the basis of hydrographic casts taken in summer 1984 during the MIZEX 84 experiment. In particular, θ − S diagrams for 16 areas, each 5◦ in longitude and 1◦ in latitude, covering the strait from 77◦N to 81◦ N are used to characterize the water masses and discuss their possible origin. Near the surface, the East Greenland Polar Front clearly separates the lighter, cold and fresh Polar Water (PW) from the heavier, warm and saline Atlantic Water (AW). In the upper ocean, the data show a large spreading of the temperature maximum in the θ − S space associated with different modes of the AW recirculating southward below the PW. Two geographically distinct salinity minima are found in the intermediate layer below the AW. The denser one, in the Boreas Basin, is a feature typical of the Arctic Intermediate Water (AIW) formed by winter convection to the south of the strait, while the lighter one is sandwiched in the Arctic Ocean outflow between the AW layer and the Upper Polar Deep Water (UPDW) characterized by a downward salinity increase. In the deep layer, two salinity maxima are present. The shallower (and warmer) one, associated with the Canadian Basin Deep Water (CBDW), appears all along the East Greenland Slope. A similar but weaker maximum is also found in the southeastern part of the strait. This maximum is perhaps a remnant of the maximum in the East Greenland Current after it has been recirculated back to the strait around the cyclonic gyres of the Nordic Seas. The deeper one appears typically as a near-bottom salinity jump characteristic of the Eurasian Basin Deep Water (EBDW). The jump is found in two distinct areas of the strait, to the north-west in the Lena Trough and to the south-east in the rift valley of the Knipovich Ridge. The maximum in the former area should have been advected from the Arctic Ocean below the CBDW, while the maximum in the latter area might have originated from haline convection on the adjacent shelves. Some EBDW is trapped in the Molloy Deep over a denser water with salinity decreasing down to the bottom and temperature in the range of the Greenland Sea Deep Water (GSDW).
Źródło:
Oceanologia; 2002, 44, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of application of feed-water injector heaters to steam power plants
Autorzy:
Trela, M.
Kwidziński, R.
Głuch, J.
Butrymowicz, D.
Powiązania:
https://bibliotekanauki.pl/articles/259351.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
power plants
feedwater heaters
supercritical steam-water injector
injector model based on balances of mass
Opis:
Steam-water injectors are devices in which exchange of mass, momentum and energy between two fluids being in direct contact, occurs. They can operate as pumps, mixers or direct contact heat exchangers. In the last aspect their use as feed-water heaters in Rankine thermal cycle of steam power plants both in land and sea applications (to merchant and naval ships) is very interesting. This paper presents selected results of heat-and-flow investigations of a supercritical steam-water injector, obtained in Institute of Fluid Flow Machinery, Polish Academy of Sciences (IMP PAN). On their basis value of average heat transfer coefficient for mixing chamber was determined; the obtained values were even a few dozens greater than those for classical shell-and-tube heaters. In the theoretical part of this work is presented an original injector model based on balances of mass, momentum and energy, written for control volumes containing separately particular elements of injector. On the basis of the model flow parameters in characteristic cross-sections of injector were determined. The calulations were performed for two different injectors tested in IMP PAN (Gdańsk) and SIET (Piacenza, Italy), and their good compliance with experimental data was achieved.
Źródło:
Polish Maritime Research; 2009, S 1; 64-70
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heat flow in a tube bank of a condenser considering the influence of air
Autorzy:
Joachimiak, M.
Joachimiak, D.
Krzyślak, P.
Powiązania:
https://bibliotekanauki.pl/articles/240202.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
condensation
inert gas
mass share of gas noncondensing in water vapor
Dalton’s law
water vapor pressure
air partial pressure
kondensacja
gaz obojętny
Prawo Daltona
ciśnienie pary wodnej
ciśnienie parcjalne
Opis:
The pressure of wet water vapor inside a condenser has a great impact on the efficiency of thermal cycle. The value of this pressure depends on the mass share of inert gases (air). The knowledge of the spots where the air accumulates allows its effective extraction from the condenser, thus improving the conditions of condensation. The condensation of water vapor with the share of inert gas in a model tube bank of a condenser has been analyzed in this paper. The models include a static pressure loss of the water vapor/air mixture and the resultant changes in the water vapor parameters. The mass share of air in water vapor was calculated using the Dalton’s law. The model includes changes of flow and thermodynamic parameters based on the partial pressure of water vapor utilizing programmed water vapor tables. In the description of the conditions of condensation the Nusselts theory was applied. The model allows for a deterioration of the heat flow conditions resulting from the presence of air. The paper contains calculations of the water vapor flow with the initial mass share of air in the range 0.2 to 1%. The results of calculations clearly show a great impact of the share of air on the flow conditions and the deterioration of the conditions of condensation. The data obtained through the model for a given air/water vapor mixture velocity upstream of the tube bank allow for identification of the spots where the air accumulates.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 119-134
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Balance errors in numerical solutions of shallow water equations
Autorzy:
Gąsiorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1933150.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
shallow water equations
nonlinear advection equations
numerical errors
conservation laws
mass and momentum balance
Opis:
An analysis of the conservative properties of shallow water equations is presented, focused on the consistency of their numerical solution with the conservation laws of mass and momentum. Two different conservative forms are considered, solved by an implicit box scheme. Theoretical analysis supported with numerical experiments is carried out for a rectangular channel and arbitrarily assumed flow conditions. The improper conservative form of the dynamic equation is shown not to guarantee a correct solution with respect to the conservation of momentum. Consequently, momentum balance errors occur in the numerical solution. These errors occur when artificial diffusion is simultaneously generated by a numerical algorithm.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 4; 329-340
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in Atlantic water characteristics in the South-Eastern Mediterranean Sea as a result of natural and anthropogenic activities
Autorzy:
Said, M.A.
Gerges, M.A.
Maiyza, I.A.
Hussein, M.A.
Radwan, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/47724.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Atlantic water
change
Mediterranean Sea
Egypt
natural activity
anthropogenic activity
temperature
salinity
trend
water mass
subsurface water
water column
Źródło:
Oceanologia; 2011, 53, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition of cherry fruit from the cultivars Kelleris 16 and Lutowka depending on different water conditions and fertilization
Autorzy:
Jaroszewska, A.
Kowalewska, R.
Powiązania:
https://bibliotekanauki.pl/articles/1189777.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
chemical composition
cherry
fruit
Kelleris 16 cultivar
Lutowka cultivar
water condition
fertilization
macroelement
microelement
dry mass
plant cultivar
Opis:
The research was conducted in 2011-2012, at the Experimental Station in Lipnik near Stargard Szczeciński, on soil classified as Haplic Cambisol, with low useful water retention. The experiment was designed with a split-plot method and repeated seven times. Grass cover was maintained in the row middles while the area underneath the trees was kept as herbicide fallow. The trees were planted in 4x2 m spacing. The assessment concerned the influence of irrigation and NK fertilisation on the dry matter and chemical composition of cherry fruit from the cultivars Kelleris 16 and Łutówka. Micro-irrigation was used at water potential in soil lower than 0.01 MPa. According to agronomic recommendations, nitrogen fertilizers were applied in early spring and potassium fertilizers in autumn in the following doses: 0 NK (control, no fertilization), 1 NK – 80 kg.ha-1 (40+40), 2 NK - 160 kg.ha-1(80+80), according to agronomic recommendations. Ammonium nitrate containing 34% of nitrogen and potash salt containing 60% of potassium were used for fertilization. Observations of the irrigated trees showed an increase in the dry mass in their fruit, as well as a decrease in nitrogen, potassium and magnesium concentrations, but an increase in the amount of calcium. Chemical analyses of the fruit harvested from the trees fertilized with nitrogen and potassium demonstrated an increase in the analysed traits (macro- and micronutrients), at both 1NK and 2NK fertilization levels.
Źródło:
Journal of Elementology; 2016, 21, 1; 43-52
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition of cherry fruit from the cultivars Kelleris 16 and Lutowka depending on different water conditions and fertilization
Autorzy:
Jaroszewska, A.
Kowalewska, R.
Powiązania:
https://bibliotekanauki.pl/articles/962732.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
chemical composition
cherry
fruit
Kelleris 16 cultivar
Lutowka cultivar
water condition
fertilization
macroelement
microelement
dry mass
plant cultivar
Opis:
The research was conducted in 2011-2012, at the Experimental Station in Lipnik near Stargard Szczeciński, on soil classified as Haplic Cambisol, with low useful water retention. The experiment was designed with a split-plot method and repeated seven times. Grass cover was maintained in the row middles while the area underneath the trees was kept as herbicide fallow. The trees were planted in 4x2 m spacing. The assessment concerned the influence of irrigation and NK fertilisation on the dry matter and chemical composition of cherry fruit from the cultivars Kelleris 16 and Łutówka. Micro-irrigation was used at water potential in soil lower than 0.01 MPa. According to agronomic recommendations, nitrogen fertilizers were applied in early spring and potassium fertilizers in autumn in the following doses: 0 NK (control, no fertilization), 1 NK – 80 kg.ha-1 (40+40), 2 NK - 160 kg.ha-1(80+80), according to agronomic recommendations. Ammonium nitrate containing 34% of nitrogen and potash salt containing 60% of potassium were used for fertilization. Observations of the irrigated trees showed an increase in the dry mass in their fruit, as well as a decrease in nitrogen, potassium and magnesium concentrations, but an increase in the amount of calcium. Chemical analyses of the fruit harvested from the trees fertilized with nitrogen and potassium demonstrated an increase in the analysed traits (macro- and micronutrients), at both 1NK and 2NK fertilization levels.
Źródło:
Journal of Elementology; 2016, 21, 1
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation analyses of Baltic Sea winter water mass formation and its impact on secondary and tertiary production
Autorzy:
Hinrichsen, H.H.
Lehmann, A.
Petereit, C.
Schmidt, J.
Powiązania:
https://bibliotekanauki.pl/articles/47630.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
zooplankton
fish egg
development
thermal stratification
winter
water
Baltic Sea
mass formation
survival
Opis:
The thermal stratification of the upper water layers in the Baltic Sea varies seasonally in response to the annual cycle of solar heating and wind-induced mixing. In winter,the stratification down to the halocline is almost completely eroded by convection and strong wind mixing. Monthly averaged temperature profiles obtained from the ICES hydrographic database were used to study the long-term variability (1950 to 2005) of winter water mass formation in different deep basins of the Baltic Sea east of the island of Bornholm. Besides strong interannual variability of deep winter water temperatures,the last two decades show a positive trend (increase of 1–1.5◦C). Correlations of winter surface temperatures to temperatures of the winter water body located directly above or within the top of the halocline were strongly positive until the autumn months. Such a close coupling allows sea surface temperatures in winter to be used to forecast the seasonal development of the thermal signature in deeper layers with a high degree of confidence. The most significant impact of winter sea surface temperatures on the thermal signature in this depth range can be assigned to February/March. Stronger solar heating during spring and summer results in thermal stratification of the water column leading to a complete decoupling of surface and deep winter water temperatures. Based on laboratory experiments,temp erature-dependent relationships were utilised to analyse interannual variations of biological processes with special emphasis on the upper trophic levels (e.g.,stage-sp ecific developmental rates of zooplankton and survival rates of fish eggs).
Źródło:
Oceanologia; 2007, 49, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Degradations of 2,4-dichlorophenol and polychlorinated biphenyls with zero valent iron under subcritical conditions. Importance of subcritical water oxidation
Autorzy:
Oh, S.-Y.
Yoon, M.-K.
Powiązania:
https://bibliotekanauki.pl/articles/207444.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chemicals removal
water treatment
degradation
gas chromatography
iron
mass spectrometry
organic pollutants
polychlorinated biphenyls
2,4-dichlorophenol
DCP
polychlorinated biphenyl
PCBs
usuwanie chemikaliów
uzdatnianie wody
degradacja
chromatografia gazowa
żelazo
spektrometria masowa
zanieczyszczenia organiczne
polichlorowane bifenyle
PCB
2,4-dichlorofenol
Opis:
The abiotic transformations of 2,4-dichlorophenol (DCP) and polychlorinated biphenyls (PCBs) has been examined in the presence and of zero valent iron (Fe(0)) under subcritical conditions. It was found that the degradation of DCP was significantly enhanced, showing complete degradation of DCP in 3 h at 300 °C. Control experiments without Fe(0) indicated that the removal of DCP in the iron–water system was mostly due to subcritical water oxidation and that the enhancement of degradation in the presence of Fe(0) was less significant. Regardless of Fe(0), PCBs were rapidly decomposed, showing 93% destruction in 5 h at 300 °C. Product identification by gas chromatography-mass spectrometry (GC-MS) analysis showed that the reductive transformation of DCP and PCBs w Fe(0) existed under subcritical conditions. Our results suggest that subcritical water degradation may be a possible remediation option to treat DCP and PCBs in water and soil.
Źródło:
Environment Protection Engineering; 2015, 41, 3; 73-86
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of hazardous metal ions in the water with resonant MEMS biosensor frequency shift – concept and preliminary theoretical analysis
Autorzy:
Rahimi, Z.
Yazdani, J.
Hatami, H.
Sumelka, W.
Baleanu, D.
Najafi, S.
Powiązania:
https://bibliotekanauki.pl/articles/202229.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
micro-mechanical sensor
hazardous metals
resonant frequency shift
micro mass-sensor
drinking water
Opis:
Heavy metal ions (e.g. cadmium, chromium, copper, nickel, arsenic, lead, zinc) have significantly serious side effects on the human health. They can bind with proteins and enzymes, altering their activity, increasing neurotoxicity, generating reactive oxygen species (ROS), promote cellular stress and resulting in their damage. Furthermore, the size, shape and type of metal are important for considering nano- or microtoxicity. It then becomes clear that the levels of these metals in drinking water are an important issue. Herein, a new micro-mechanical sensor is proposed to detect and measure these hazardous metals. The sensor consists of a micro-beam inside a micro-container. The surface of the beam is coated with a specific protein that may bind heavy metals. The mass adsorbed is measured using the resonant frequency shift of the micro-beam. This frequency shift due to the admissible mass (which is considered acceptable for drinking water based on the World Health Organization (WHO) standard) of manganese (Mn), lead (Pb), copper (Cu) and cadmium (Cd) is investigated for the first, second and third mode, respectively. Additionally, the effects of micro-beam off-center positions inside the micro-container and the mass location and investigated.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 529-537
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of atmospheric circulation on water temperature along the Southern Baltic Sea coast
Autorzy:
Girjatowicz, J.P.
Swiatek, M.
Powiązania:
https://bibliotekanauki.pl/articles/48210.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
atmospheric circulation
water temperature
surface temperature
thermal property
air mass
correlation
Baltic Sea
coastal zone
Źródło:
Oceanologia; 2019, 61, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emission of volatile organic compounds (VOC) from waterborne lacquers with different content of solids
Emisja lotnych związków organicznych (VOC) z wodorozcieńczalnych wyrobów lakierowych o zróżnicowanej zawartości ciał stałych
Autorzy:
Stachowiak-Wencek, A.
Pradzynski, W.
Powiązania:
https://bibliotekanauki.pl/articles/52642.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
emission
volatile organic compound
lacquer
solid content
water-borne lacquer
gas chromatography-mass spectrometry
thermal desorption
wood-based material
wood
Opis:
This paper presents the results of investigations on the emission of volatile organic compounds (VOC) from oak wood surfaces finished with acrylic waterborne lacquers. The lacquers selected for the experiments were characterised by a different content of solids, fluctuating between 32 and 38%. The volatile organic compounds were analysed using a gas chromatography technique combined with mass spectrometry and thermal desorption (GC/MS/TD). Tenax TA was employed as an adsorption medium. The obtained results indicate that volatile organic compound emissions from the experimental waterborne lacquers varied widely from 388 to 1794 μg/m3. The most important constituents of emissions included compounds that belonged mainly to glycol ethers as well as aliphatic and aromatic hydrocarbons.
Przedstawiono wyniki badań emisji lotnych związków organicznych z powierzchni drewna dębowego, uszlachetnionego akrylowymi lakierami wodorozcieńczalnymi. Użyte wyroby lakierowe charakteryzowały się różną zawartością ciał stałych, która zmieniała się w zakresie od 32 do 38%. Lotne związki organiczne analizowano techniką chromatografii gazowej połączonej ze spektrometrią mas i termiczną desorpcją (GC/MS/TD). Jako medium adsorpcyjne zastosowano Tenax TA. Uzyskane rezultaty wskazują, iż emisja lotnych związków organicznych z wyrobów wodorozcieńczalnych zmieniała się w szerokim zakresie, od 388 do 1794 μg/m3. Głównymi składnikami emisji były związki należące w większości do eteroglikoli, węglowodorów alifatycznych oraz aromatycznych.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2011, 54, 186
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the Frasnian-Famennian mass extinction: Comparing brachiopod faunas
Autorzy:
Copper, P
Powiązania:
https://bibliotekanauki.pl/articles/22494.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
brachiopod fauna
global loss
Palmatolepis linguiformis
climate cycle
Palmatolepis rhenana
Atrypida
water setting
mass extinction
Brachiopoda
South America
Famennian
shelf area
Frasnian
atrypid extinction
Late Devonian
Devonian
reef habitat
paleontology
Opis:
The Frasnian-Famennian (F-F) mass extinctions saw the global loss of all genera belonging to the tropically confined order Atrypida (and Pentamerida): though Famennian forms have been reported in the literafure, none can be confirmed. Losses were more severe during the Givetian (including the extinction of the suborder Davidsoniidina, and the reduction of the suborder Lissatrypidina to a single genus), but origination rates in the remaining suborder surviving into the Frasnian kept the group alive, though much reduced in biodiversity from the late Early and Middle Devonian. In the terminal phases of the late Palmatolepis rhenana and P. linguiformis zones at the end of the Frasnian, during which the last few Atrypidae dechned, no new genera originated, and thus the Atrypida were extirpated. There is no evidence for an abrupt termination of all lineages at the F-F boundary, nor that the Atrypida were abundant at this time, since all groups were in decline and impoverished. Atypida were well established in dysaerobic, muddy substrate, reef lagoonal and off-reef deeper water settings in the late Givetian and Frasnian, alongside a range of brachiopod orders which sailed through the F-F boundary: tropical shelf anoxia or hypoxia seems implausible as a cause for atrypid extinction. Glacial-interglacial climate cycles recorded in South America for the Late Devonian, and their synchronous global cooling effect in low latitudes, as well as loss of the reef habitat and shelf area reduction, remain as the most likely combined scenarios for the mass extinction events.
Źródło:
Acta Palaeontologica Polonica; 1998, 43, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 56

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