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Tytuł:
An analysis of variability in demand for natural gas at rural households
Analiza zmiennosci zapotrzebowania wiejskich gospodarstw na gaz ziemny
Autorzy:
Trojanowska, M.
Lipczynska, D.
Powiązania:
https://bibliotekanauki.pl/articles/792576.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
natural gas
gas consumption
distribution
rural household
variability analysis
statistical analysis
cluster analysis
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza zmienności odpowiedzi konstrukcji w kontekście akcelerogramów dobieranych do uśrednionych spektrów odpowiedzi
The analysis of variability of construction response in the context of accelerograms matched to the averaged response spectra
Autorzy:
Bąk, Michał
Powiązania:
https://bibliotekanauki.pl/articles/162813.pdf
Data publikacji:
2019
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
analiza zmienności
konstrukcja
model obliczeniowy
akcelerogram
spektrum odpowiedzi
variability analysis
construction
computational model
accelerogram
response spectrum
Opis:
Ocena metod wyboru akcelerogramów jako danych wstępnych podczas analiz time-history skupia się obecnie na odpowiedniej reprezentacji warunków sejsmicznych lokalizacji. Jednym z czynników, który może być brany pod uwagę podczas selekcji akcelerogramów może być rozproszenie wyników analizy konstrukcji. W niniejszym artykule autor rozważa konstrukcję stalową, badaną uprzednio w publikacjach [2, 3, 4, 5, 6], na podstawie 12 różnych parametrów użytych podczas wyboru rzeczywistych wymuszeń kinematycznych, jako danych wstępnych do analizy time-history.
Assessment of accelerogram selection methods, as preliminary data during the time-history analyses, currently focuses on adequate representation of seismic conditions of location [1]. One of the factors which can be taken into account during the selection may be scattering of results of constructional analysis. In this article, the author examines a steel construction, previously tested in publications [2, 3, 4, 5, 6], based on 12 different parameters used during selection of actual kinematic excitations, as preliminary data for the time-history analysis.
Źródło:
Przegląd Budowlany; 2019, 90, 9; 19-27
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geostatystyczne badania struktury zmienności parametrów jakościowych węgla w Górnośląskim Zagłębiu Węglowym
Geostatistical studies of variability structure of coal quality parameters for selected seams in Upper Silesian Coal Basin
Autorzy:
Kokesz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/165371.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
geostatystyka
analiza zmienności
węgiel kamienny
zawartość popiołu
wartość opałowa
zawartość siarki
geostatistics
variability analysis
hard coal
ash content
caloricity
total sulphur content
Opis:
W niniejszej pracy przedstawiono wyniki dotychczas przeprowadzonych badań struktury zmienności podstawowych parametrów jakościowych węgla w Górnośląskim Zagłębiu Węglowym: zawartości popiołu, wartości opałowej oraz zawartości siarki całkowitej (A/t/r, Q/t/r, S/t/r). Na ich podstawie sformułowano wnioski dotyczące metodyki badania struktury zmienności i prognozowania parametrów jakościowych kopaliny z wykorzystaniem procedury krigingu.
This paper presents the results of hitherto conducted studies of the variability structure of primary quality parameters of coal in Upper Silesian Coal Basin, such as: ash caloricity and total sulphur contents (A/t/r, Q/t/r, S/t/r). The abovementioned was a basis for conclusions regarding the methodology of studies of variability structure and forecasts of quality parameters by use of kriging procedure.
Źródło:
Przegląd Górniczy; 2014, 70, 2; 68-75
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability analysis of selected quantitative characteristics in edible potato varieties
Analiza zmienności wybranych cech ilosciowych u odmian ziemniaka jadalnego
Autorzy:
Bombik, A.
Rymuza, K.
Markowska, M.
Stankiewicz, C.
Powiązania:
https://bibliotekanauki.pl/articles/47108.pdf
Data publikacji:
2007
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
edible potato
potato
potato variety
variability analysis
quantitative parameter
component
tuber yield
starch content
dry matter content
vitamin C content
potato quality
variation coefficient
Opis:
The paper presents the variability analysis of some quantitative characteristics, that is of tuber yield, starch content and yield, dry matter content and yield and vitamin C content in selected edible potato varieties. Reciprocal relations of variance components calculated and their percentage share in the total variability were a measure of variability evaluation for the characteristics examined. Moreover, the variability of the characteristics was characterised by means of the classical variability coefficient. It has been found that tuber yield and vitamin C content variability was determined mainly by the interaction effects of years and the factors examined, as well as the experimental error. The respective values were as follows: 44.3% and 34.7% for tuber yield, and 42.2% and 46.2% for vitamin C. The starch content was in 47.5% modified by the effects of the main factors (including 35.0% for years) and the error effect (39.0%). A similar interaction was observed in the case of dry matter content variability, but the error was 52.4%. Starch and dry matter yields were determined mainly by interaction effects of the years and the examined factors (40.7% and 39.9%, respectively) as well as the experimental error (32.2% of the total variability for both traits). The highest changes expressed as the values of the coefficient of variation were found for tuber yield, dry matter yield and starch yield.
W pracy przedstawiono analizę zmienności niektórych cech ilościowych, tj. plonu bulw, zawartości i plonu skrobi, zawartości i plonu suchej masy oraz zawartości witaminy C u wybranych odmian ziemniaka jadalnego. Miarą oceny zmienności badanych cech były wzajemne relacje wyznaczonych ocen komponentów wariancyjnych ich oraz procentowy udział w zmienności całkowitej. Zmienność badanych cech scharakteryzowano, korzystając z klasycznego współczynnika zmienności. Wykazano, że zmienność plonu bulw i witaminy C determinowana była głównie przez efekty interakcyjne lat z badanymi czynnikami i błąd doświadczalny. Wartości te wynosiły odpowiednio: 44,3% i 34,7% dla plonu bulw oraz 42,2% i 46,2% dla witaminy C. Zawartość skrobi modyfikowana była w 47,5%, przede wszystkim przez efekty czynników głównych (w tym lat 35,0%) i efekt błędu (39,0%). Podobną reakcję odnotowano w przypadku zmienności zawartości suchej masy, z tym że błąd stanowił 52,4%. Plon skrobi i suchej masy determinowany był głównie przez efekty interakcyjne lat z badanymi czynnikami (odpowiednio: 40,7% i 39,9%) oraz błąd doświadczalny (po 32,2% zmienności całkowitej). Największym zmianom, wyrażonym w postaci współczynnika zmienności, podlegał plon bulw, suchej masy i skrobi.
Źródło:
Acta Scientiarum Polonorum. Agricultura; 2007, 06, 3
1644-0625
Pojawia się w:
Acta Scientiarum Polonorum. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of multivariate analysis of the radon variability in the underground laboratory and indoor environment
Autorzy:
Filipović, J.
Maletić, D.
Udovičić, V.
Banjanac, R.
Joković, D.
Savić, M.
Veselinović, N.
Powiązania:
https://bibliotekanauki.pl/articles/147023.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
multivariate analysis
radon variability
Opis:
The paper presents results of multivariate analysis of variations of radon concentrations in the shallow underground laboratory and a family house, depending on meteorological variables only. All available multivariate classifi cation and regression methods, developed for data analysis in high-energy physics and implemented in the toolkit for multivariate analysis (TMVA) software package in ROOT, are used in the analysis. The result of multivariate regression analysis is a mapped functional behaviour of variations of radon concentration depending on meteorological variables only, which can be used for the evaluation of radon concentration, as well as to help with modelling of variation of radon concentration. The results of analysis of the radon concentration variations in the underground laboratory and real indoor environment, using multivariate methods, demonstrated the potential usefulness of these methods. Multivariate analysis showed that there is a potentially considerable prediction power of variations of indoor radon concentrations based on the knowledge of meteorological variables only. In addition, the online system using the resulting mapped functional behaviour for underground laboratory in the Institute of Physics Belgrade is implemented, and the resulting evaluation of radon concentrations are presented in this paper.
Źródło:
Nukleonika; 2016, 61, 3; 357-360
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pollen morphology of Polish species of genus Rubus - Part I. Rubus gracilis
Autorzy:
Wronska-Pilarek, D
Malinski, T.
Lira, J.
Powiązania:
https://bibliotekanauki.pl/articles/41631.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Rubus
Polish species
pollen morphology
Rubus gracilis
statistical analysis
intraspecific variability
pollen variability
locality
Opis:
Pollen morphology and pollen variability of Rubus gracilis were studied. A total of 260 grains from 13 natural Polish localities were examined. Important characteristics include: a stretched bridge; a visible pore area and endopores; ectocolpi arranged regularly, more or less evenly spaced or, more rarely, joining one another in the apocolpium, long (79.3% length of the polar axis) and narrow; exine sculpture striate, distinct; striae and muri of equal width, rather narrow; striae usually running parallel to the polar axis, sometimes forming semicircles in the apocolpium zone; with distinct perforations. The size, outline and shape turned out to be poor criteria when identifying the species. A statistical analysis of 10 quantitative grain characteristics showed their little variability. The highest variability was found to occur in two traits connected with d (the distance between the apices of two ectocolpi). Statistical studies revealed no differences among the grains from the individual localities, likely the result of apomixis.
Źródło:
Dendrobiology; 2006, 56; 69-77
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Validation and statistical analysis of the group for high resolution sea surface temperature data in the Arabian Gulf
Autorzy:
Nesterov, O.
Temimi, M.
Fonseca, R.
Nelli, N.R.
Addad, Y.
Bosc, E.
Abida, R.
Powiązania:
https://bibliotekanauki.pl/articles/2078874.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
validation
statistical analysis
sea surface temperature
annual variability
seasonal variability
Arabian Gulf
Oman Sea
Opis:
The combined effect of climate change and steadily increasing seawater demand for industrial and domestic purposes in the Arabian Gulf region has a significant impact on the ecosystem in this region. Additionally, this effect may reduce the efficiency and increase the operating costs of industrial facilities that utilize seawater for cooling and other purposes. In this context, it is important to know various statistical characteristics of the sea surface temperature (SST) and their trends, in addition to the mean climatological characteristics. The analysis conducted in this study utilized a 17-year Group for High Resolution Sea Surface Temperature Level 4 dataset of 0.01 × 0.01° spatial resolution. First, the dataset was compared against a 2-year seawater temperature measurements at the ten offshore buoys in the relatively shallow coastal waters of the United Arab Emirates between Ras Ghumais and Dubai, which showed a reasonably good agreement between the two datasets, with the estimated root mean square deviations ranging from 0.5 to 0.9°C. Subsequently, several statistical SST characteristics were calculated. The trend analysis showed not only positive tendencies in the mean SSTs of up to 0.08°C/year in the northern Gulf, but also the trends in the annual percentile exceedances, particularly the 95th percentiles (near-maximum SSTs), which increased by approximately 0.07°C/year in the western United Arab Emirates and eastern Qatar waters. On the contrary, the 5th percentiles (near-minimum SSTs) decreased by up to 0.1°C/year, especially in the waters around Bahrain, Qatar, and the western United Arab Emirates. These results indicate that extreme hot and cold SST events in the Gulf are becoming more frequent and more extreme than before.
Źródło:
Oceanologia; 2021, 63, 4; 497-515
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Restriction analysis of genetic variability of Polish isolates of Tomato black ring virus.
Autorzy:
Jończyk, Magdalena
Borodynko, Natasza
Pospieszny, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1041544.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
restriction analysis
genetic variability
phylogeny
Tomato black ring virus
Opis:
Several different isolates of Tomato black ring virus (TBRV) have been collected in Poland from cucumber, tomato, potato and black locust plants. Biological tests showed some differences in the range of infected plants and the type of symptoms, which was the basis for selection of seven the most biologically different TBRV isolates. According to the sequence of TBRV-MJ, several primer pairs were designed and almost the entire sequence of both genomic RNAs was amplified. The RT-PCR products derived from all tested TBRV isolates were digested by restriction enzymes. On the basis of the restriction patterns, the variable and the conserved regions of the TBRV genome were defined and the relationships between the Polish TBRV isolates established.
Źródło:
Acta Biochimica Polonica; 2004, 51, 3; 673-681
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State-space estimation of soil organic carbon stock
Autorzy:
Timm, L.C.
Ogunwole, J.O.
Obidike-Ugwu, E.O.
Gabriels, D.M.
Powiązania:
https://bibliotekanauki.pl/articles/26250.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil
organic carbon
variability
component analysis
organic matter
agricultural management
Opis:
Understanding soil spatial variability and identifying soil parameters most determinant to soil organic carbon stock is pivotal to precision in ecological modelling, prediction, estimation and management of soil within a landscape. This study investigates and describes field soil variability and its structural pattern for agricultural management decisions. The main aim was to relate variation in soil organic carbon stock to soil properties and to estimate soil organic carbon stock from the soil properties. A transect sampling of 100 points at 3 m intervals was carried out. Soils were sampled and analyzed for soil organic carbon and other selected soil properties along with determination of dry aggregate and water-stable aggregate fractions. Principal component analysis, geostatistics, and state-space analysis were conducted on the analyzed soil properties. The first three principal components explained 53.2% of the total variation; Principal Component 1 was dominated by soil exchange complex and dry sieved macroaggregates clusters. Exponential semivariogram model described the structure of soil organic carbon stock with a strong dependence indicating that soil organic carbon values were correlated up to 10.8m.Neighbouring values of soil organic carbon stock, all waterstable aggregate fractions, and dithionite and pyrophosphate iron gave reliable estimate of soil organic carbon stock by state-space.
Źródło:
International Agrophysics; 2014, 28, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractal analysis of ostracod shell variability: A comparison with geometric and classic morphometrics
Autorzy:
Aiello, G
Barattolo, F.
Barra, D.
Fiorito, G.
Mazzarella, A.
Raia, P.
Viola, R.
Powiązania:
https://bibliotekanauki.pl/articles/22918.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
fractal analysis
variability
statistical method
systematics
Krithe compressa
ostracod
shell
Ostracoda
morphometry
morphological variability
Krithe iniqua
paleontology
Opis:
Two statistical methods, fractal geometry and geometric morphometrics, are tested for their applicability to ostracod systematics. For this comparison, two morphologically similar ostracod species (Krithe compressa and Krithe iniqua) whose genus−level systematics is still incompletely resolved, are selected. Twenty−nine right valves of each species were collected from the upper Pliocene samples at the Monte San Nicola section in southern Italy. Statistical analyses (MANOVA on morphometric shape variables, and D values) were utilized to test if geometric morphometrics and fractal analysis are appropriate into discriminating between the two species. Both methods succeeded in distinguishing the species statistically. The fractal analysis of the two ostracod species shows D values centered on 1.31±0.02 for Krithe iniqua and on 1.40±0.02 for Krithe compressa. Geometric morphometric analysis indicates significant differences between the two species and allows studying intra−populational variability as well as. The most variable traits indicated by geometric morphometrics are vestibular area and posterior outline of the shell, indicating that these traits are the most relevant for the systematics of the species analyzed. Both fractal geometry and geometric morphometrics provide a measure of population variability. Fractal analysis has the advantage of being free from any subjectivity in the selection of characters and could be most appropriate to use for analysis of complex ornamentation for systematic purposes. However, a possible advantage of geometric morphometrics over fractal analysis is its ability to indicate where statistically significant variations in shape occur on the shell.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability of Pinus uncinata Ramond ex DC as expressed in needle traits
Zmienność igieł Pinus uncinata Ramond ex DC
Autorzy:
Boratynska, K.
Bobowicz, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/41754.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
variability
statistical analysis
pine
morphoanatomy
Spain
Pinus uncinata
needle trait
Opis:
Two-year needles were collected from 42 trees from 5 localities in Spanish Pyrenees. The needles were analysed in respect to 15 morphological and anatomical traits. Data obtained were subject of multivariate statistical analyses. The most stable traits appear to be width of epidermis cells, width and thickness of the needles and ratio of the last two characters. Number of the resin canals and the vascular bundles distance were the most variable characters. The differences among the 42 investigated trees are not evident, considerably small and not significant statistically.
Praca zawiera szczegółową analizę zmienności igieł P. uncinata. Materiał pochodził z 5 różnych naturalnych stanowisk z 42 drzew z hiszpańskich Pirenejów. W badaniach uwzględniono 15 cech morfologicznych i anatomicznych a uzyskane wyniki z pomiarów poddano szczegółowej analizie statystycznej. Ustalono, że zmienność między drzewami w badanej populacji P. uncinata jest stosunkowo niewielka i nie istotna statystycznie. Najbardziej stabilnymi cechami okazały się iloraz grubości i szerokości igły (cecha14), szerokość komórek epidermy (cecha11), szerokość i grubość igły (cechy 7 i 8) a także grubość komórek epidermy (cecha 10) i liczba szparek po obydwu stronach igły (cechy 4 i 5). Współczynniki zmienności dlawspomnia nych cech nie przekraczają 9%. Największe różnice, jednak statystycznie nie istotne, obserwowano w liczbie kanałów żywicznych (cecha 6) i w odległościach między wiązkami (cecha 9) oraz we współczynniku Marceta (cecha12).
Źródło:
Dendrobiology; 2000, 45
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological variability of leaves of Sorbus torminalis [L.] Crantz in Poland
Autorzy:
Bednorz, L
Powiązania:
https://bibliotekanauki.pl/articles/56763.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
morphological variability
leaf
Sorbus torminalis
plant morphology
statistical analysis
Polska
Opis:
This paper presents the results of the study on morphological variability of leaves of a scattered tree species Sorbus torminalis (L.) Crantz) in Poland. The leaves from short- and long shoots were collected from 17 localities widespread within the range of the species in Poland. Leaves were measured according to 15 morphological traits. The biometric data were subjected to multivariate statistical analysis in attempt to define variability between local populations. Most of the leaf traits are significantly correlated and are characterised by moderate level of variation. The average among population component of variation was 32.82% and 27.46% for leaves on short- and long shoots, respectively. The differences between sampled populations are significant, but only a weak geographical pattern of this differentiation was detected. Clinal type of variation was ascertained in two traits. Leaf traits which discriminate best the studied populations are also indicated. It was proved that leaves on short shoots differ markedly in shape and size from those of long shoots. Leaves on long shoots are steadier, but morphological trait values are less correlated. The study also confirmed the occurrence of individuals with leaves characteristic for S. torminalis var. perincisa Borbas et Feck and S. torminalis f. mollis Beck in a few Polish populations.
Źródło:
Acta Societatis Botanicorum Poloniae; 2006, 75, 3; 233-243
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological leaf variability of rowan [Sorbus aucuparia L. Emend. Hedl. subsp. aucuparia] in the Wielkopolska National Park
Zmiennosc morfologiczna lisci jarzebu pospolitego [Sorbus aucuparia L. Emend. Hedl. subsp. aucuparia] w Wielkopolskim Parku Narodowym
Autorzy:
Bednorz, L.
Byzia, A.
Powiązania:
https://bibliotekanauki.pl/articles/878270.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
variability
Sorbus aucuparia
Wielkopolski National Park
Polska
botany
rowan
morphological variability
leaf
Wielkopolska region
multivariate statistical analysis
Źródło:
Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2005, 09
1896-1908
Pojawia się w:
Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nontrivial variations of morpho-anatomical leaf traits in natural south-eastern populations of vaccinium species from Central Balkans
Autorzy:
Bjedov, I.
Obratov-Petkovic, D.
Rakonjac, V.
Skocajic, D.
Bojovic, S.
Markovic, M.
Dajic-Stevanovic, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2142112.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Analysis of Variance
climate factors
Cluster Analysis
elevational gradient
Principal Component Analysis
Serbia
intraspecific and interspecific variability
Opis:
Morpho-anatomical characteristics of Vaccinium myrtillus, V. uliginosum and V. vitis-idaea leaves from several sites of the Central Balkans were examined. The aim of this study was to investigate for the first time morpho-anatomical leaf traits of these species in the studied populations and to identify traits that follow a specific trend along the gradients of climate factors. Leaf traits that discriminate Vaccinium species were as follows: depth of the adaxial cuticule (AdC), thickness of the palisade tissue (PT), thickness of the spongy tissue (ST), height of the abaxial epidermal cells (AbE), height of the abaxial cuticule (AbC) and leaf thickness (LT). Populations of V. myrtillus were characterized by the smallest, and populations of V. vitis-idaea by the highest values for AdC, PT, ST, AbE and LT. Additionally, AbC was significantly larger for V. uliginosum in comparison to two other species. On the basis of morpho-anatomical traits, intraspecific variability of the studied species was explored by Principal Component Analysis (PCA), Cluster Analysis (CA) and Analysis of Variance (ANOVA). CA based on 10 morpho-anatomical traits showed that populations of V. myrtillus and V. uliginosum that grew at lower altitudes (characterized by higher mean annual temperature) are more similar to each other. Especially V. myrtillus was responsive to the elevational gradient and exhibited the highest plasticity in morpho-anatomical leaf traits. Populations of V. vitis-idaea had a different pattern of differentiation along the elevational gradient. CA showed that the populations at the lowest and at the highest altitudes were more similar according to the morpho-anatomical leaf traits, meaning that evergreen leaves were more resistant to environmental conditions.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2021, 63, 2; 7-16
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heart Rate Variability and Motion Sickness During Forklift Simulator Driving
Autorzy:
Zużewicz, K.
Saulewicz, A.
Konarska, M.
Kaczorowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/90661.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
motion sickness
heart rate variability
spectral analysis
forklift truck virtual simulator
Opis:
The goal of the study was to determine the effect of a 1-h hour long forklift truck virtual simulator driving on the mechanism of autonomic heart rate (HR) regulation in operators. The participants were divided into 2 subgroups: subjects with no definite inclination to motion sickness (group A) and subjects with a definite inclination to motion sickness (group B). Holter monitoring of electrocardiogram (ECG) signal was carried out in all subjects during the virtual simulator driving. For 12 consecutive epochs of ECG signal, HR variability analysis was conducted in time and frequency domains. In subjects with a definite inclination to motion sickness after ~30 min of the driving, changes in parameter values were found indicating an increase in sympathetic and parasympathetic activity with parasympathetic dominance.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 4; 403-410
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the heart rate variability for women, specializing in race walking, throughout the menstrual cycle
Autorzy:
Kalytka, S.
Borovska, N.
Roda, O.
Karabuza, M.
Powiązania:
https://bibliotekanauki.pl/articles/2052359.pdf
Data publikacji:
2015
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
heart rate variability
spectral analysis
athletes
menstrual cycle
exercise
race walking
Opis:
The article presents the results of studies of the heart rate variability for women, specializing in race walking, at different phases of the menstrual cycle (MC). The results of spectral analysis of heart rate indicate that the first half of the MC is dominated by the contribution of MC HF component, and the second half is dominated by the contribution of the LF component and an ovulatory phase is dominated by the contribution of VLF component in the total power spectrum. According to the results of the geometric analysis, the increase of Mo in menstrual and postmenstrual phases of the MC, reduction of AMo – in postmenstrual, ovulatory phases indicates an increase in the HR functional state in these phases. Decrease of the HR functional state we noted in the premenstrual phase: Mo rates have dropped, and AMo – increased. IT indicators of regulatory systems have increased in postovulatory and premenstrual phases of the MC. In this regard, we have recommended the use of significant and strenuous exercise with the consideration of female athletes’ HR functional state in different phases of the MC.
Źródło:
Health Problems of Civilization; 2015, 09, 4; 5-10
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pollen morphology of Polish species of the genus Rosa - I. Rosa pendulina
Autorzy:
Wronska-Pilarek, D
Lira, J.
Powiązania:
https://bibliotekanauki.pl/articles/40988.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Rosa
Alpine rose
Rosa pendulina
Polish species
pollen morphology
variability
multivariate analysis
Opis:
The morphology and variability of pollen of Rosa pendulina L. were studied. The material came from 10 native localities of this species. 300 pollen grains were examined. It was established that the diagnostic features of pollen grains of R. pendulina L. were: an elongated, narrow operculum, a poorly developed exine sculpture, long ectocolpi (a low value of the apocolpium index), and the predominance of grains elongated in shape. The results obtained usually correspond to data supplied by other palynologists. A statistical analysis of 10 quantitative grain characteristics showed their variability to be rather low. The highest variability was found to occur in two traits connected with d (the distance between the apices of two ectocolpi). Statistical studies revealed dependences among the grains from the 10 analysed localities
Źródło:
Dendrobiology; 2006, 55; 65-73
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological, phenological and agronomical characterisation of variability among common bean (Phaseolus vulgaris L.) local populations from The National Centre for Plant Genetic Resources: Polish Genebank
Autorzy:
Boros, L.
Wawer, A.
Borucka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1870.pdf
Data publikacji:
2014
Wydawca:
Instytut Ogrodnictwa
Tematy:
morphological variability
phenological variability
agronomic characteristics
common bean
Phaseolus vulgaris
dry bean
local population
cluster analysis
gene bank
genotypic variation
Źródło:
Journal of Horticultural Research; 2014, 22, 2
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multifractal detrended fluctuation analysis of heart rate variability
Autorzy:
Bębas, Ewelina
Kasperczuk, Anna
Oczeretko, Edward
Bossowski, Artur
Borowska, Marta
Powiązania:
https://bibliotekanauki.pl/chapters/2204804.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fractal dimension
heart rate variability
ECG
diabetes
children
multifractal detrended fluctuation analysis
multifractal
Opis:
The analysis of heart rate variability can be used to predict cardiovascular state in diabetic children. Studies on HRV are mainly based on RR intervals of the ECG signal and include both linear indices and nonlinear characteristics. The current study aims at applying Multifractal Detrended Fluctuation Analysis to investigate signals of the heart rate variability (HRV) in 50 healthy children (group K), 27 patients suffering from diabetes type 1 without subsequent vascular complications (group A) and 35 patients suffering from diabetes type 1 with subsequent vascular complications (hypertension) (group B). Multifractal features were extracted to quantitatively compare signal complexity between the healthy group and the group of children with diabetes and diabetes with complications. The MFDFA analysis showed the multi-fractional nature of the signals in all groups. The characteristic MFDFA parameters were determined and subjected to statistical analysis. It showed differences in parameters h(1) and h(2) between the control group K and group A. This gives rise to the development of further research in an attempt to distinguish between these groups.
Źródło:
Advances in biomedical engineering; 109-122
9788367185400
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (Northeastern Mediterranean)
Autorzy:
Yucel, N.
Powiązania:
https://bibliotekanauki.pl/articles/48586.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
spatio-temporal variability
primary production
chlorophyll a
phytoplankton
ecosystem
nutrient analysis
temperature
salinity
principal component analysis
Mediterranean Basin
Źródło:
Oceanologia; 2018, 60, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pollen morphology of selected European species of the genus Allium L. (Alliaceae)
Morfologia ziarn pyłku wybranych europejskich gatunków z rodzaju Allium L. (Alliaceae)
Autorzy:
Wrońska-Pilarek, D.
Halbritter, H.
Krzymińska, A.
Bednorz, L.
Bocianowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/11543283.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
pollen morphology
European species
Allium
Alliaceae
pollen variability
palynology
micromorphology
taxonomy
SEM analysis
Opis:
The pollen morphology of eight species from three subgenera and five sections of the genus Allium L. was studied by LM and SEM (i.e.: A. angulosum, A. carinatum, A. senescens subsp. montanum, A. oleraceum, A. scorodoprasum, A. ursinum, A. victorialis and A. vineale). The material came from natural sites of these species located in Poland, Czech Republic, Austria and Italy. For measurements a sample consisted of 30 pollen grains. In total, 240 pollen grains were analysed. They were analysed in respect to six quantitative features (i.e.: length of long axis – LA, length of short axis – SA, thickness of exine along long axis – Ex, SA/LA and Ex/LA ratios and length of sulcus) and the following qualitative ones: pollen outline and shape, exine ornamentation. Taxonomic value of these pollen features is considerable, especially on the sections level. On the basis of these features, it is impossible to distinguish individual Allium species but only their groups. The examined features were characterized by moderate (LA, SA and SA/LA) or high variability (Ex, Ex/LA). Among studied species the lowest variability was found in A. victorialis and the highest in A. vineale and A. oleraceum.
W pracy przedstawiono wyniki badań nad morfologią ziarn pyłku ośmiu gatunków z rodzaju Allium L. (A. angulosum, A. carinatum, A. senescens subsp. montanum, A. oleraceum, A. scorodoprasum, A. ursinum, A. victorialis i A. vineale) reprezentujących trzy podrodzaje i pięć sekcji, oparte na obserwacjach przy użyciu mikroskopu świetlnego (LM) i skaningowego (SEM). Materiał badawczy pochodził ze stanowisk naturalnych wymienionych gatunków zlokalizowanych w Polsce, Czechach, Austrii i we Włoszech. Pojedyncza próba pomiarowa składała się z 30 ziarn pyłku, a ogółem poddano analizie 240 ziarn. Ziarna pyłku przebadano pod względem sześciu cech ilościowych (długość osi długiej – LA, długość osi krótkiej – SA, grubość egzyny wzdłuż osi długiej – Ex, stosunek SA/LA i Ex/LA oraz długość „sulcus” – wydłużonego otworu ułożonego dystalnie) oraz cech jakościowych takich jak zarys i kształt ziarn pyłku oraz urzeźbienie powierzchni egzyny. Wykazano, że wartość taksonomiczna tych cech jest znacząca, szczególnie na poziomie sekcji, oraz że cechy te nie umożliwiają rozróżnienia pojedynczych gatunków Allium, a tylko ich grup. Analizowane cechy ziarn pyłku charakteryzował średni (LA, SA i SA/LA) lub wysoki (Ex, Ex/LA) poziom zmienności. Wśród badanych gatunków najniższy poziom zmienności reprezentowały ziarna pyłku A. victorialis, a najwyższy – A. vineale i A. oleraceum.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 4; 65-84
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seed variability of the Polish species of the genus Sorbus (Rosaceae)
Autorzy:
Bednorz, L
Walkowiak, R.
Maciejewska-Rutkowska, I.
Molinski, K.
Powiązania:
https://bibliotekanauki.pl/articles/40978.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Polska
Polish species
plant variation
plant taxonomy
statistical analysis
biometry
seed variability
Sorbus
Rosaceae
Opis:
This paper presents the results of the study on morphological differentiation of seeds of five Polish species of the genus Sorbus L. (S. aria (L.) Crantz, S. aucuparia L. Emend. Hedl., S. chamaemespilus (L.) Crantz, S. intermedia (Ehrh.) Pers. and S. torminalis (L.) Crantz). The biometric data of 1980 seeds were subjected to multivariate statistical analysis in attempt to define intraspecific variation and to find differences between studied taxa. Most of the seed traits are significantly correlated and are characterised by moderate level of variation. Seeds of S. aucuparia (both subspecies) are the least variable while seeds of S. torminalis and S. intermedia the most. On the basis of size and shape traits of Sorbus seeds only seeds of S. aucuparia can be definitely distinguished from the others.
Źródło:
Dendrobiology; 2006, 55; 3-9
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Satellite estimates of the long-term trend in phytoplankton size classes in the coastal waters of North-Western Bay of Bengal
Autorzy:
Miranda, J.
Lotliker, A.A.
Baliareingh, S.K.
Jena, A.K.
Samanta, A.
Sahu, K.C.
Kumar, T.S.
Powiązania:
https://bibliotekanauki.pl/articles/2079007.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton
size class
coastal water
long-term variability
satellite data
statistical analysis
Bengal Bay
Opis:
The study presents long-term variability in satellite retrieved phytoplankton size classes (PSC) at two coastal sites, off Gopalpur and Visakhapatnam, in the north-western Bay of Bengal. The abundance-based models by Brewin et al. (2010) (B10) and Sahay et al. (2017) (S17), for retrieval of PSC (micro, nano, and picophytoplankton), from satellite data, were validated. Both the models performed well in the retrieval of nano and microphytoplankton. However, B10 performed poorly in retrieving picophytoplankton. The statistical analysis indicated better performance of the S17 model and hence was applied to Moderate Resolution Imaging Spectroradiometer onboard Aqua satellite (MODISA) data to understand the temporal (at monthly climatology) and spatial variability (from nearshore to offshore). The spatial distribution indicated nearshore dominance of micro and offshore dominance of picophytoplankton. In nearshore waters off Gopalpur, microphytoplankton dominated throughout the year except for months of south-west monsoon (June and July) where the dominance of picophytoplankton was observed. All PSC exhibited similar distribution at an annual scale with a primary peak during pre-monsoon (March and April) and a secondary peak during post-monsoon (September— November). However, microphytoplankton concentration during post-monsoon was higher off Gopalpur in comparison to Visakhapatnam. The higher microphytoplankton concentration during pre-monsoon was attributed to recurrent phytoplankton blooms. Whereas, post-monsoon increment could be attributed to enhanced phytoplankton growth by availing nutrients sourced from monsoonal precipitation induced terrigenous influx. The outcome of the present study recommends the use of the S17 model for satellite retrieval of PSC from the north-western Bay of Bengal.
Źródło:
Oceanologia; 2021, 63, 1; 40-50
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Heart Rate Variability Fluctuations by Wavelet Transform
Autorzy:
Popov, A.
Karplyuk, Y.
Fesechko, V.
Powiązania:
https://bibliotekanauki.pl/articles/226306.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heart rate variability
HRV fluctuations
HRV wavelet analysis
time-dependent HRV estimation
wavelet transform
Opis:
Technique for separate estimation of fast and slow fluctuations in the heart rate signal is developed. The orthogonal dyadic wavelet transform is used to separate the slow heart rate changes in approximation part of decomposition and fast changes in detail parts. Experimental results using the recordings from persons practicing Chi meditation demonstrated the applicability of estimation heart rate fluctuations with the proposed approach.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 395-400
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
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