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Tytuł:
Seasonal changeability of indoor radon concentrations in one-family house
Autorzy:
Karpińska, M.
Mnich, Z.
Kapała, J.
Antonowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/147979.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radon
seasonal changes
Opis:
Indoor radon concentration undergoes 24-hour and seasonal changes. The paper presents first in Poland results of radon concentration changeability in one building during the whole year. We performed 103 measurements of indoor radon concentrations. The following parameters of radon concentration distribution were obtained: arithmetic mean - 224.1 Bq m 3, geometric mean - 194.5 Bq m 3, median - 207 Bq m 3, and geometric standard deviation - 1.84. The minimum observed value was 22 Bq m 3 and the maximum - 748 Bq m 3. We determined the monthly and annual values of radon concentrations. The values for particular months are in the range of 0.5 to 1.6 of the annual mean. We observed a correlation between the mean radon concentrations in the examined buildings and the differences in the mean values of indoor (R = 0.91, p < 0.05) and outdoor temperatures (R = 0.91, p < 0.05). There was also a connection between the radon concentration inside the buildings and the changes in atmospheric pressure.
Źródło:
Nukleonika; 2004, 49, 1; 33-36
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jackknife Forecasts of Time Series
Wykorzystanie metody jackknife do prognozowania szeregów czasowych
Autorzy:
Wywiał, Janusz
Żądło, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/906889.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
jackknife
time series
seasonal fluctuations
Opis:
In the paper we present the examples of forecasts of time series with seasonal fluctuations. Based on the jackknife method we estimate variances of seasonal factors and the MSE of prediction. Jackknife method has been introduced by M. Quenouille (1949) and then it has been developed among others by J. Tukey (1958) and J. Shao, D. Tu (1995).
W pracy zaproponowano wykorzystanie metody jackknife do prognozowania szeregów czasowych. Oprócz problemu prognozowania tą metodą, podjęto także problem oceny średniego błędu tak wyznaczanych prognoz. W oparciu o rzeczywiste dane zaprezentowane zostały przykłady prognozowania szeregów czasowych z wahaniami sezonowymi przy wykorzystaniu wersji jackknife metody wskaźników sezonowości. Oprócz wyznaczenia wartości prognozowanej w rozważanym przypadku będzie możliwa ocena wariancji błędu predykcji. Metodę jackknife wprowadził M. Quenouille (1949), a była rozwijana m. in. przez J. Tukey’a (1958) oraz J. Shao i D. Tu (1995).
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2007, 206
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena wartości ozdobnej wybranych gatunków klonów Acer L. na podstawie obserwacji fenologicznych
Evaluation of decorative value of selected species of maples Acer l. Based on phenological observations
Autorzy:
Sowelo, M.
Antkowiak, W.
Powiązania:
https://bibliotekanauki.pl/articles/2130555.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
seasonal rhythm
climate factors
Acer
Opis:
The paper presents the results of phenological observations carried out in 2017 on the following species of maples: Acer buergerianum, A. campestre, A. capillipes, A. cappadocicum, A. carpinifolium, A. circinatum, A. cissifolium, A. davidii, A. diabolicum, A. griseum, A. japonicum, A. maximowiczianum, A. miyabei, A. mono, A. palmatum, A. platanoides, A. rubrum, A. rufinerve, A. saccharum, A. shirasawanum, A. stachyophyllum, A. tataricum, A. tataricum ssp. ginnala and A. truncatum. The studies have been conducted in the Botanical Garden of Adam Mickiewicz University in Poznań based on the Shennikov research method (1928) modified by Łukasiewicz (1984). Observations have shown that the longest foliage period have species: A. japonicum, A. mono, A. platanoides and A. rubrum, while the longest duration of the autumn leaf discoloration is characterized by A. stachyophyllum, A. circinatum, A. palmatum, A. mono and female specimen of A. cissifolium. In addition all studied species, except A. buergerianum, A. capillipes, A. circinatum, A. tataricum and A. tataricum ssp. ginnala, are distinguished by the attractive autumn color of the leaves. The longest flowering period was in A. truncatum, A. stachyophyllum, A. circinatum and A. palmatum, while A. buergerianum, A. diabolicum and A. saccharum did not bloom at all. The most attractive flowers have A. davidii and A. platanoides and the most decorative fruits have A. capillipes, A. davidii, A. tataricum and A. tataricum ssp. ginnala. Studies have also shown that A. mono, A. rubrum and A. rufinerve did not fruition at all. The species of maple with the highest number of positive traits is Acer davidii, therefore it should be used as often as possible in green areas.
Źródło:
Steciana; 2018, 22, 3; 69-83
1689-653X
Pojawia się w:
Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annual observations of radon activity concentrations in dwellings of Silesian Voivodeship
Autorzy:
Wysocka, M.
Kozłowska, B.
Dorda, J.
Kłos, B.
Chmielewska, I.
Rubin, J.
Karpińska, M.
Dohojda, M.
Powiązania:
https://bibliotekanauki.pl/articles/148558.pdf
Data publikacji:
2010
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radon
apartment buildings
geology
seasonal changeability
Opis:
In the paper, results of year-long measurements of radon levels in dwellings on the premises of Silesian Voivodeship are presented. Track etched detectors with polymer CR-39 foils were used in the investigations. As the studied buildings were located in different regions of Silesian Voivodeship, therefore results of measurements were analysed due to possible influence of geological structure or effect of mining operations in places, where given dwellings were situated. Elevated concentrations of radon were measured mostly in dwellings located in areas, where permeable Triassic limestone and dolomite occur, as it has been predicted. On the other hand, the impact of mining activity such as disintegration of rock-body and activation of faults plays an important role, too, because it enables radon migration and its entry into buildings. Beside the analysis of seasonal variations of radon activity concentration, the impact of temperature and pressure on these fluctuations outdoor and indoor buildings has been analysed.
Źródło:
Nukleonika; 2010, 55, 3; 369-375
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variation of autoproteolytic activity in the Antarctic krill, Euphausia superba Dana
Autorzy:
Kołakowski, Edward
Powiązania:
https://bibliotekanauki.pl/articles/2053308.pdf
Data publikacji:
1986
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic
krill
autoproteolytic activity
seasonal changes
Źródło:
Polish Polar Research; 1986, 7, 3; 275-282
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal Changes in Nitrogen, Phosphorus, BOD and COD Removal in Bystre Wastewater Treatment Plant
Autorzy:
Skoczko, I.
Struk-Sokołowska, J.
Ofman, P.
Powiązania:
https://bibliotekanauki.pl/articles/124271.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wastewater treatment
seasonal changes
dairy wastewater
Opis:
The aim of this study was to determinate seasonal changes in industrial wastewater treatment effectiveness. Studies were carried out in mechanical-biological wastewater treatment plant in Bystre near Giżycko to which inflows mixture of domestic and dairy wastewater. Laboratory studies were carried out by Water and Wastewater Company in Giżycko. For statistical analysis results form years 2014 and 2015 were considered. The scope of statistical analysis includes basic statistical measures including arithmetic mean, median, minimum, maximum and standard deviation. Changes in seasonal treatment effectiveness were shown by Fisher-Snedecore LSD test. Seasonal changes were observed for BOD, COD and total nitrogen removal effectiveness. Total phosphorus was not subjected to that kind of changes.
Źródło:
Journal of Ecological Engineering; 2017, 18, 4; 185-191
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variation in heavy metal distribution in the sediments of selected dams in Nasarawa State, Nigeria
Autorzy:
Gav, B. L.
Aremu, M. O.
Etonihu, A. C.
Powiązania:
https://bibliotekanauki.pl/articles/1109614.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dams
Heavy metal
Seasonal variations
sediments
Opis:
The study was carried out to ascertain seasonal variation in heavy metal distribution in sediments from Dams located in Nasarawa State, Nigeria. Sediment samples were collected twice each at two different seasons for two years from May to September, 2014 and November-December, 2014 to March, 2015 for wet and dry seasons, respectively. Similarly, sediment samples were collected from May to September, 2015 and November-December, 2015 to March, 2016 for wet and dry seasons, respectively. The samples were then assessed for heavy metal properties, using atomic absorption spectrophotography (AAS). Analysis of variance (ANOVA) was then applied. The mean results of the heavy metal levels showed high values in dry seasons and low values in wet seasons in the two years of the study. Herein, the results of ANOVA revealed significant difference in the heavy metal concentrations between the seasons, dams and years. Our study also indicated that for heavy metals, the levels determined in sediments were within the WHO acceptable standards, except for Pb and Mn. These exceeded the WHO acceptable standards for drinking water. Based on these results, the dam waters are, therefore, polluted and unsuitable for human consumption, except after treatment.
Źródło:
World News of Natural Sciences; 2018, 20; 148-159
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal changes of carbohydrate content in Antarctic krill (Euphausia superba Dana)
Autorzy:
Kołakowski, Edward
Szyper-Machowska, Lidia
Powiązania:
https://bibliotekanauki.pl/articles/2053142.pdf
Data publikacji:
1989
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic krill
carbohydrate fractions
seasonal variations
Źródło:
Polish Polar Research; 1989, 10, 2; 133-139
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution and Seasonal Variation of Heavy Metals in Sediments of Muthupet Lagoon, Southeast Coast of India
Autorzy:
Balakrishnan, T.
Sundaramanickam, A.
Shekhar, S.
Balasubramanian, T.
Powiązania:
https://bibliotekanauki.pl/articles/125289.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
seasonal variation
heavy metals
Muthupet lagoon
Opis:
This study deals with seasonal variation of heavy metals in sediments of Muthupet lagoon, Southeast coast of India from September 2011 to August 2012. The bulk sediments were association with sand, silt and clay. Geoaccumulation index (lgeo) was used to quantitatively assess the influences of heavy metal pollution. Heavy metals were determined by using Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES) and the results were compared to permissible limits of WHO/USEPA. The minimum concentration of heavy metals in all the stations were found during the post monsoon and summer seasons and the maximum concentration of heavy metals in all the stations were found during the premonsoon and monsoon seasons. The reason for the pollution was land drainage, irrigation through channels and municipal wastes and also the peak agricultural activities due to the release of fresh water from reservoirs. Among all the metals iron was found to be maximum in all the stations in postmonsoon and summer season followed by magnesium and manganese. Apart from these three metal, all other six metals are recorded in moderate range. The reason for the high concentration of these metals are anthropogenic activity, agriculture, aquaculture and the rivers regular in and out flow throughout the study duration in the lagoon area.
Źródło:
Journal of Ecological Engineering; 2015, 16, 3; 49-60
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal occurrence of Alternaria [1993-2004] and Epicoccum [1994-2004] spores in Trieste [NE Italy]
Autorzy:
Rizzi-Longo, L
Pizzulin-Sauli, M.
Ganis, P.
Powiązania:
https://bibliotekanauki.pl/articles/51828.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Tematy:
Alternaria
seasonal occurrence
Epicoccum
spore
seasonal variation
meteorological factor
Trieste
Italy
airborne spore
human disease
respiratory disease
Źródło:
Annals of Agricultural and Environmental Medicine; 2009, 16, 1; 63-70
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inter-individual and seasonal variability of biological indices in notothenioid fishes from Admiralty Bay, Antarctica
Autorzy:
Kamler, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/2052099.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
notothenioid fishes
endangered species
seasonal changes
Źródło:
Polish Polar Research; 2002, 23, 3-4; 265-278
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problematyka polskich emigrantów sezonowych na Łotwie na łamach tygodnika „Nasze Życie” w latach 1936–1939
Issues Related to Polish Seasonal Migration to Latvia in the Weekly “Nasze Życie” During the Years 1936–1939
Autorzy:
Grzybowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1791075.pdf
Data publikacji:
2020-11-21
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
Polska
Latvia
seasonal migration
newspaper Nasze Życie
Opis:
In the 1930s, Latvia was one of the main target countries for economic emigration from Poland. Emigration to Latvia was seasonal. Between 1936 and 1939, each year about 40,000 Polish agricultural workers were employed in Latvian agriculture. Polish seasonal migration was the object of attention of the contemporary press, both Polish and foreign. A very valuable source of knowledge about Polish seasonal migration is the newspaper Nasze Życie (Our Life). This applies especially to various aspects of Polish migrants’ everyday life. It was the only Polish newspaper in Latvia (it was published in Riga). From 1936, the newspaper had a special section devoted to seasonal workers. It contained information and messages addressed to the migrants. The editorial team’s task was to provide the workers with comprehensive and reliable help. In this regard, advice and guidance was given on the organisation of workers’ lives and work. These advices were difficult to overestimate. The newspaper also covered religious and moral topics. At the same time, the newspaper was the main link between the workers and the Polish consular service. It published messages of the Polish Consulate in Riga. Unfortunately, the weekly reached few seasonal migrants. Most workers did not read or subscribe to the newspaper for various reasons. The article analyses the content of the newspaper Nasze Życie. The author confronted the content of the newspaper with other available sources regarding the issues of Polish seasonal migration in Latvia.
Źródło:
Studia Interkulturowe Europy Środkowo-Wschodniej; 2020, 13; 246-277
1898-4215
Pojawia się w:
Studia Interkulturowe Europy Środkowo-Wschodniej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An assessment of seasonal variations in the cref cors at the University of Lagos
Autorzy:
Nwilo, Peter Chigozie
Ayodele, Emmanuel Gbenga
Okolie, Chukwuma John
Orji, Michael Joseph
Marve, Mnguhenen Funmilayo
Oyelade, Esther Abidemi
Daramola, Olagoke Emmanuel
Powiązania:
https://bibliotekanauki.pl/articles/100398.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
GNSS
CORS
CREF
CSRS-PPP
seasonal variation
Opis:
Continuously Operating Reference Stations (CORS) are reference stations of the Global Navigation Satellite System (GNSS), providing fundamental positioning infrastructure that is accurate and reliable. As such, CORS are designed to meet the needs of a wide range of users requiring high three-dimensional (3D) positional accuracy. The Continuously Operating Reference Station at the Engineering Faculty (CREF), University of Lagos was set up in order to support research applications in Surveying, Mapping and Geodesy. This study evaluates the seasonal variations in the 3D coordinates of CREF using metrics such as coordinate differences, Standard Deviation (SD) and Standard Error (SE). The Canadian Spatial Reference System (CSRS), known as CSRS – Precise Point Positioning (CSRS-PPP) was used to compute the station’s daily coordinates over a three-year period from 2016 to 2018. In the analysis, the daily coordinates were divided into two seasons - the wet and the dry. The results obtained show that the dry and the wet seasons had SDs (5.4 mm, 3.9 mm, and 2.0 mm) and (5.2 mm, 18.6 mm and 14.4 mm) in the x, y and z-directions respectively. Generally, the dry season presents a better result than the wet season as revealed by the accuracy metrics. These results have led to an increased understanding of the seasonal variability inherent in the data acquired by GNSS CORS, and must be taken into consideration: in particular, for GNSS applications such as the weather prediction and water vapour estimation. This study concludes that more needs to be done regarding the maintenance of CREF to ensure data continuity and reliability for geodetic studies.
Źródło:
Geomatics, Landmanagement and Landscape; 2020, 1; 63-77
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variability in the Baltic Sea level
Autorzy:
Stramska, M.
Kowalewska-Kalkowska, H.
Swirgon, M.
Powiązania:
https://bibliotekanauki.pl/articles/48431.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
seasonal variability
Baltic Sea
sea level
standard deviation
seasonal cycle
North Sea
satellite altimetry
spatial resolution
temporal resolution
Źródło:
Oceanologia; 2013, 55, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interface of Geodiversity, Geomorphosites, Geotourism and Seasonal Economy in Lahaul and Spiti, Himachal Pradesh, India
Autorzy:
Krishnanand, -
Powiązania:
https://bibliotekanauki.pl/articles/1395723.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
geodiversity
geotourism
geomorphosites
Trans-Himalaya
seasonal economy
Opis:
Interface of Geodiversity with human response can be understood simply as, the natural range (diversity) of geological (rocks, minerals, fossils), geomorphological (landforms, topography, physical processes), soil and hydrological features including their assemblages, structures, systems and contributions to landscapes together with the anthropogenic amalgamation in the landscape system. Geomorphosites are those components of geodiversity that have acquired a scientific, cultural/historical, aesthetic and socio-economic value due to human perception or exploitation (Panizza, 2001). The trans-Himalayan district of Lahaul and Spiti, Himachal Pradesh, India is a landlocked district in trans-Himalaya accessible seasonally through high mountain passes; where the interface is manifested though human response to the geodiversity elements. The abiotic factors play a significant role in generating stimuli and the human response varies accordingly in the study area. It is also known as the Tethyan Himalayan region, where the interface (interactive zone/ crossing point/edge) of Geomorphosites and human response in terms of geotourism has been analysed and mapped. The data has been collected through extensive field work using structured questionnaire survey and field observations at geomorphosites having unique characteristics. The field work has been done in May–June 2017 and June 2018. The assessment of human response in terms of seasonal economy and geotourism has been done using GIS environment, GPS and SWOT analysis. The study highlights that potential geotourism sites have to be further identified, explored and developed in the region and the existing sites have to be conserved in order to harness the tremendous geotourism potential of the region and thereby boosting the seasonal economy.
Źródło:
Landform Analysis; 2019, 38; 25-34
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Efficiency of Aquatic Macrophytes on the Nitrogen and Phosphorous Uptake from Pond Effluents in Different Seasons
Autorzy:
Kalengo, Lilian
Ge, Hailong
Liu, Nannan
Wang, Zhijian
Powiązania:
https://bibliotekanauki.pl/articles/1955528.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
biomass
nutrients
phytoremediation
pond effluent
seasonal variation
Opis:
The present study investigated the efficiency of four aquatic macrophytes: Lemna spp, Pistia stratiotes, Ipomoea aquatica and Eichhornia crassipes on nitrogen and phosphorous utilization from aquacultural effluents concerning seasonal changes and biomass production. These nutrients in excess affect fish health and cause eutrophication in water bodies, hence affecting the ecosystem. Aquatic macrophytes were planted in tanks filled with the effluents from carp pond and other tanks were left without plants, serving as control/algal treatment. The water samples were collected weekly for analysis of total nitrogen (TN), ammonia-nitrogen (NH3-N), nitrate-nitrogen (NO3-N), total phosphorus (TP) and ortho-phosphate (ortho-P). The results show that average water temperature raised from 12.2 ± 0.21 °C in winter to 32.0 ± 0.4 °C in summer with no significant difference (p>0.05) between treatments whereas pH was neutral in winter and slightly alkaline in the other seasons. Seasonal changes had impact on macrophytes biomass accumulation with the highest in spring for Lemna spp (91.3%), followed by P. stratiotes (81%) and in summer, E. crassipes (64%). Autumn and winter had the lowest biomass accumulation and I. aquatica had the lowest values in all seasons. For each season, the nutrients concentration decreased with no significant difference (p>0.05) between treatments. Average NH3-N removal efficiencies were higher during summer and autumn followed by spring and lowest in winter for all treatments. NO3-N and TN decreased significantly from the highest in summer to the lowest in winter in all treatments. The ortho-P removal efficiency was slightly higher than TP and decreased from the highest in spring to the lowest in winter (91.4% to 7.8%, control/algae; 90.3% to 8.4%, E. crassipes; 86.2% to 8.3%, Lemna spp; 82.5% to 10.8%, P. stratiotes). The chlorophyll a concentration was higher in Lemna spp (62.2 μg/L) and control/microalgae treatments (59.3 μg/L) indicating that there was probably microbial community that contributed to nutrient utilization. Aquatic macrophytes, in association with microalgae, were responsible for the nitrogen and phosphorous removal. Seasonal temperature change affects the growth and nutrients uptake of aquatic macrophytes. A decrease in temperature reduces the efficiency of nutrients removal and biomass production. For an effective N and P removal from pond effluents in a given season, selection of a proper aquatic macrophyte must be taken into consideration with regards to a given season.
Źródło:
Journal of Ecological Engineering; 2021, 22, 8; 75-85
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal dynamics of Ceratophyllus sciurorum sciurorum [Schrank, 1803] [Siphonaptera] in Slovakia
Autorzy:
Cyprich, D
Spitalska, E.
Krumpal, M.
Powiązania:
https://bibliotekanauki.pl/articles/836202.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Siphonaptera
zoology
Ceratophyllus sciurorum sciurorum
Slovakia
seasonal dynamics
Opis:
The authors pay attention to an occurrence of the taxon Ceratophyllus sciurorum sciurorum (Schrank, 1803) (Siphonaptera) in Slovakia during the whole season. The curve of occurrence this taxon of fleas has showed two high points. The first top has been achieved in April and second one followed in October. In December the authors have noticed a period and named it "cocoon block". This course of the curve has been found at the species from family Myoxidae, mostly. On the other hand, the course of curve of the birdboxes nesters has the opossite position, the high points have been recorded in autumn. A conspicuous differences has been probably caused by different biology of nesters of Myoxidae and birds in boxes. The ratio of males to females these ecological groups of hosts was different, too.
Źródło:
Annals of Parasitology; 2001, 47, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal dynamics of Ceratophyllus sciurorum sciurorum [Schrank, 1803] [Siphonaptera] in Slovakia
Autorzy:
Cyprich, D.
Spitalska, E.
Krumpal, M.
Powiązania:
https://bibliotekanauki.pl/articles/2147874.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Siphonaptera
zoology
Ceratophyllus sciurorum sciurorum
Slovakia
seasonal dynamics
Opis:
The authors pay attention to an occurrence of the taxon Ceratophyllus sciurorum sciurorum (Schrank, 1803) (Siphonaptera) in Slovakia during the whole season. The curve of occurrence this taxon of fleas has showed two high points. The first top has been achieved in April and second one followed in October. In December the authors have noticed a period and named it "cocoon block". This course of the curve has been found at the species from family Myoxidae, mostly. On the other hand, the course of curve of the birdboxes nesters has the opossite position, the high points have been recorded in autumn. A conspicuous differences has been probably caused by different biology of nesters of Myoxidae and birds in boxes. The ratio of males to females these ecological groups of hosts was different, too.
Źródło:
Wiadomości Parazytologiczne; 2001, 47, 1; 49-59
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal variability in the optical properties of Baltic aerosols
Autorzy:
Zdun, A.
Rozwadowska, A.
Kratzer, S.
Powiązania:
https://bibliotekanauki.pl/articles/48230.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
seasonal variability
optical property
Baltic aerosol
aerosol optical thickness
wavelength
meteorological factor
atmospheric aerosol
solar radiation
Baltic Sea
seasonal cycle
Źródło:
Oceanologia; 2011, 53, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health Risk Factors in Different Seasons of Carpet Industry in Kashmir, India
Autorzy:
Wani, K. A.
Jaiswal, Y. K.
Powiązania:
https://bibliotekanauki.pl/articles/91044.pdf
Data publikacji:
2012
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
carpet industry
health problems
ergonomics
seasonal variation
Kashmir
Opis:
Carpet workers are exposed to different types of health risk factors in different seasons of the year. As the environmental conditions become harsh, risk for developing various types of diseases increases. These problems are further aggravated when the environmental conditions at the workplace deteriorate. An attempt has been made to study the health risk factors in the carpet industry in different seasons of the year. It has been concluded that in winter weavers are affected by several types of health risk factors as compared to the other seasons.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2012, 18, 4; 571-577
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of wave energy in the Persian Gulf: An evaluation of the impacts of climate change
Autorzy:
Goharnejad, H.
Nikaein, E.
Perrie, W.
Powiązania:
https://bibliotekanauki.pl/articles/2078996.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
wave energy
seasonal variation
climate change
Persian Gulf
Opis:
We are motivated to study the exploitation of marine energy as a renewable resource because of society’s ever-increasing energy demands, and a concomitant need to reduce greenhouse gas emissions. Additionally, climate-related variations in wave energy should be investigated in order to ensure the stability of its long-term availability. Here, we investigate the potential for wave energy in the Persian Gulf along the southern coasts of Iran. To do so, we have applied the Mike SW numerical model and ECMWF wind field data for a 30-year study, from 1988 to 2017. For this purpose, wave energy was evaluated at six points in the western, northern, southern, and eastern parts of the Persian Gulf. To assess the impacts of climate change, we also consider the wave regime from 2070 to 2099 (for 30 years) following IPCC RCP4.5 and RCP8.5 climate change scenarios. Our findings suggest that in the present climate, seasonal variations in the mean wave parameters (i.e. wave energy, wave period, and significant wave height) correspond to the lowest wave energy in the summers, and highest in the winters. In the future climate change scenarios, energy level variations generally have similar patterns, with slight modulations in some local areas.
Źródło:
Oceanologia; 2021, 63, 1; 27-39
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of the Exponential Smoothing Method for Forecasting of the Sales Volume of an Opencast Mine of Rock and Raw Materials
Implementacja metody wyrównania wykładniczego do prognozowania wielkości sprzedaży kopalni odkrywkowej surowców skalnych
Autorzy:
Trzaskuś-Żak, B.
Powiązania:
https://bibliotekanauki.pl/articles/318338.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
metoda wyrównywania wykładniczego
prognozowanie
model addytywny sezonowy
model multiplikatywny sezonowy
exponential smoothing methods
forecasting
seasonal additive model
seasonal multiplicative model
Opis:
This article uses an exponential smoothing method to forecast the time series of temporary sales of an opencast rock and raw materials mine. Six models of foresight were developed: three seasonal additive models (with linear, exponential and fading trend) and three seasonal multiplicative models (with linear, exponential and fading trend). The exponential smoothing method can be used for current enterprise management, not just mining. This method can be used to make relevant decisions based on the verified forecasts. It is designed for short-term forecasting-even several times during the day based on current changing data. This method is a useful tool for forecasting time series for not only sales. It can be used to forecast inventory, receivables, etc. However, despite the great progress in predictive methods of the future, which is particularly aided by computer technics, the forecast of the Economist is fraught with greater or lesser errors, and it is therefore necessary to verify developed models. The quality of the forecast should be determined by its relevance, which is determined by means of ex post errors (expired forecast errors). Furthermore, the quality should also be monitored and the forecasts should be corrected if necessary. To develop forecasts in the six models mentioned, the STATISTICA program, which provides a transparent and quite rapid forecasting of the use of the exponential smoothing method in twelve possible variants. STATISTICA also allows to verify the developed model by drawing an adjustment chart of this model with actual time series, verifying ex post errors, and creating a histogram of the rest of the model. This article also carried out verifications of the models developed by designating the errors of expired forecasts (ex post errors), as well as verification, on the basis of the histogram, whether the rest of the developed models have a normal distribution. For this purpose the Shapiro-Wilk test was used.
W artykule zastosowano metodę wyrównywania wykładniczego do prognozowania szeregu czasowego sprzedaży kopalni odkrywkowej surowców skalnych. Opracowano sześć modeli prognostycznych; trzy sezonowe modele addytywne (z trendem liniowym, wykładniczym oraz trendem gasnącym) oraz trzy sezonowe modele multiplikatywne (z trendem liniowym, wykładniczym oraz trendem gasnącym). Metoda wyrównywania wykładniczego może być wykorzystywana w bieżącym zarządzaniu przedsiębiorstwem, nie tylko górniczym. Metoda ta może służyć do podejmowania trafnych decyzji opartych na opracowanych i zweryfikowanych prognozach. Przeznaczona jest do krótkookresowego tworzenia prognoz - nawet kilkukrotnie w ciągu dnia opartego na zmieniających się bieżących obserwacjach (danych). Metoda ta, jest to przydatne narzędzie do prognozowania szeregów czasowych dotyczących nie tylko sprzedaży. Można jej użyć do prognozowania zapasów, należności itp. Jednak pomimo dużego postępu w zakresie metod przewidywania przyszłości, szczególnie wspomaganego techniką komputerową, prognoza jaką posługuje się ekonomista jest obarczona większym lub mniejszym błędem, dlatego też potrzebna jest weryfikacja opracowanych modeli. Jakość prognozy powinna być określona poprzez jej trafność, którą określa się za pomocą błędów ex post (błędy prognoz wygasłych), powinna być również monitorowana i w razie potrzeby powinno się przeprowadzić korektę prognoz. Do opracowania prognoz w sześciu wspomnianych modelach zastosowano program STATISTICA, który w sposób przejrzysty i dosyć szybki tworzy prognozy wykorzystując metodę wyrównywania wykładniczego w dwunastu możliwych do zastosowania wariantach wygładzania wykładniczego. Program STATISTICA umożliwia również szybką weryfikację opracowanego modelu poprzez sporządzenie wykresu dopasowania opracowanego modelu do rzeczywistego szeregu czasowego, weryfikację błędów ex post, jak również utworzenie histogramu reszt modelu. W artykule przeprowadzono również weryfikację opracowanych modeli poprzez wyznaczenie błędów prognoz wygasłych (błędów ex post), jak również weryfikację, na podstawie histogramu, czy reszty opracowanych modeli mają rozkład normalny, do tego celu został wykorzystany test Shapiro-Wilka.
Źródło:
Inżynieria Mineralna; 2018, R. 20, nr 2, 2; 15-23
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of Seasonal Volatility in HICP for Baltic Region Countries: Non-Parametric Test versus Forecasting Experiment
Autorzy:
Lenart, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2076445.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HICP
seasonal volatility
exponential smoothing
nowcasting
predictive distribution
logscore
Opis:
The aim of this paper is to examine the problem of existing seasonal volatility in total and disaggregated HICP for Baltic Region countries (Denmark, Estonia, Latvia, Finland, Germany, Lithuania, Poland and Sweden). Using nonparametric tests, we found that in the case of m-o-m prices, including fruit, vegetables, and total HICP, the homogeneity of variance during seasons is rejected. Based on these findings, we propose an exponential smoothing model with periodic variance of error terms that capture the repetitive seasonal variation (in conditional or unconditional second moments). In a pseudo-real data experiment, the short-term forecasts (nowcasting) for the considered components of inflation were determined using different specifications of considered models. The forecasting performance of the models was measured using one of the scoring rules for probabilistic forecasts called logarithmic score. We found instead that while the periodic phenomenon in variance was statistically significant, the models with a periodic phenomenon in variance of error terms do not significantly improve forecasting performance in disaggregated cases and in the case of total HICP. The simpler models with constant variance of error term have comparative forecasting (nowcasting) performance over the alternative model
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2017, 1; 29-67
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endogenous carbon monoxide (CO) as a modulating factor of molecular biological clock in the hypothalamic structures involved in light transmission in pig and wild boar hybrid during long and short day season
Autorzy:
Gilun, P.
Koziorowska-Gilun, M.
Wąsowska, B.
Sowa-Kućma, M.
Kozioł, K.
Romerowicz-Misielak, M.
Kordan, W.
Koziorowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/16647460.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
carbon monoxide
humoral pathway
light
master biological clock
seasonal
Opis:
Mature males of a wild boar-pig crossbreed, during the long and short day season, were used for the study which demonstrates that the chemical light carrier CO regulates the expression of biological clock genes in the hypothalamus via humoral pathways. Autologous blood with experimentally elevated concentrations of endogenous CO (using lamps with white light-emitting diodes) was infused into the ophthalmic venous sinus via the right dorsal nasal vein. Molecular biology methods: qPCR and Western Blot were used to determine the expression of genes and biological clock proteins. The results showed that elevated endogenous CO levels, through blood irradiation, induces changes in genes expression involved in the functioning of the main biological clock located in suprachiasmatic nuclei. Changes in the expression of the transcription factors Bmal1, Clock and Npas2 have a similar pattern in both structures, where a very large decrease in gene expression was shown after exposure to elevated endogenous CO levels. The changes in the gene expression of PER 1-2, CRY 1-2, and REV-ERB α-β and ROR β are not the same for both POA and DH hypothalamic structures, indicating that both structures respond differently to the humoral signal received. The results indicate that CO is a chemical light molecule whose production in an organism depends on the amount of light. An adequate amount of light is an essential factor for the proper functioning of the main biological clock.
Źródło:
Polish Journal of Veterinary Sciences; 2023, 26, 1; 65-82
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Struktura społeczna wychodźstwa sezonowego polskich robotników rolnych do Niemiec w latach 1919-1938
Structure of social of seasonal emigration polish farmhands to Germany in the years 1919-1938
Autorzy:
Spaleniak, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/26850750.pdf
Data publikacji:
2009
Wydawca:
Akademia Zamojska
Tematy:
emigracja
emigracja sezonowa
robotnicy rolni
emigration
seasonal emigration
farmhands
Opis:
Prezentowany artykuł pretenduje do analizy – choćby częściowej – zasadniczych zrębów problematyki migracji ludności wiejskiej z obszaru Polski i wyrównywania czynnika pracy w rolnictwie niemieckim. Jest próbą odpowiedzi na pytanie o charakter i przesłanki wychodźstwa sezonowego, przedstawia jego istnienie w rzeczywistym kontekście społecznym, gospodarczym i historycznym, a zarazem jako skutek wielorakich uwarunkowań ekonomicznych i socjologicznych. Rekonstruuje przebieg wychodźstwa z uwzględnieniem jego rozpiętości chronologicznej i geograficznej, funkcjonowania w sensie procesu w miarę trwałego i masowego. Dotyka także sposobów zachowania się osób uczestniczących w tym procesie, od chwili zgłoszenia chęci do wyjazdu aż do momentu powrotu z emigracji, z uwzględnieniem struktury i liczebności polskiej emigracji w Niemczech.
The elaboration presents the fundamental questions of the process of the territorial regroup of the country people from the territory of Poland and equalization of the factor of the job in German Agriculture. This elaboration is an attempt at showing the variety of economic, social and political repercussions caused by the lack of labour hands in Germany agriculture. The article in a professional way treats also about the essence and the sphere of activity of the German State in this circle of social relations and about the methods of realization of the State aims. In this elaboration there is also brought up the subject of the incoming country relation to the emigration movement itself in relation to the quantitative regulations of migration, its composition and encouraging to migration or its limiting. Focuses on the structure and size of the Polish immigrant community in Germany.
Źródło:
Facta Simonidis; 2009, 2, 1; 115-139
1899-3109
Pojawia się w:
Facta Simonidis
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 241

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