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    Wyświetlanie 1-4 z 4
    Tytuł:
    THE VARIABILITY OF TURKEY LIVESTOCK PRICE AND ITS RELATION WITH THE PRICE OF CHICKENS, PORK AND BEEF IN 2006-2015
    Autorzy:
    Utnik-Banaś, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/452933.pdf
    Data publikacji:
    2017
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
    Tematy:
    turkeys
    price
    variability
    time series
    seasonality
    cyclic fluctuations
    Opis:
    The work determines the range of variability in the price of turkey livestock and its relation to prices of chickens, pork and beef in 2006-2015. In 2006-2011, the variability coefficient for turkey livestock was 5 to 10%, whereas in 2012-2015 it dropped below 5%. The prices were most stable out of prices of chickens, pork or beef. The biggest influence on the variability of the turkey livestock price was the long-term trend and cyclic fluctuations (82% of the total variability on average). Seasonal fluctuations had lower amplitude (between 7 and 4%) than in the case of prices of pork and chickens, and their input in the total variability amounted to 14% on average. The price of turkey livestock presented the strongest correlation with the price of beef (r=0,851) and chickens (0,837), and was the least correlated with pork (0,681). In 2006-2015 the price of turkey livestock increased by 68%, beef by 57%, chickens by 29% and pork by 13%.
    Źródło:
    Metody Ilościowe w Badaniach Ekonomicznych; 2017, 18, 1; 134-142
    2082-792X
    Pojawia się w:
    Metody Ilościowe w Badaniach Ekonomicznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trends and fluctuations of river ice regimes in the Prypiat Basin, within Ukraine
    Autorzy:
    Gorbachova, Liudmyla
    Afteniuk, Oleksandr
    Khrystiuk, Borys
    Lobodzinskyi, Oleksandr
    Powiązania:
    https://bibliotekanauki.pl/articles/2201937.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    ice phenomena
    air temperature
    Prypiat River
    homogeneity
    stationarity
    cyclic fluctuations
    tendencies
    Opis:
    Information about the formation, destruction, and duration of river ice regimes is especially important for hydropower, shipping, fisheries, etc. Research into modern trends in river ice regimes and their spatial and temporal fluctuations is essential, especially in a changing climate. This study examines the trends and fluctuations of air temperature and ice regimes based on series of observations in the Prypiat River basin within Ukraine. Air temperature data from 17 meteorological stations and ice data from 29 water gauges were analyzed. A complex analytical approach involving statistical and graphical methods was employed. The Mann-Kendall statistical test, mass curve, residual mass curve, and combined graphs were used in the study. In the Prypiat River basin within Ukraine, observations of mean monthly air temperature, ice occurrence, freeze-up, and their duration are homogeneous (quasi-homogeneous) and stationary (quasi-stationary). The quasi-homogeneous and quasi-stationary characteristics are explained by the presence in the observation series of only increasing and decreasing phases of long-term cyclical fluctuations, which are incomplete. The trends of air temperature and ice regime correspond strongly, indicating the defining role of air temperature in the formation of ice occurrence and freeze-up. Since the end of the 1990s, the warming phase of air temperature in the autumn-winter period determines the appearance of ice and freeze-up later in the year. In March, the warming trend in air temperature, which began after 1988, determines the freezeup, break-up, and disappearance of ice earlier in the year. Thus, the duration of ice and freeze-up on the rivers has decreased.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2023, 11, 1; 1--14
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie dekompozycji szeregów czasowych do analizy wahań podaży i cen drewna na przykładzie Nadleśnictwa Marcule
    Time series decomposition of timber production volume and prices using the example of the Marcule Forest District
    Autorzy:
    Banas, J.
    Kożuch, A.
    Zaborski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/979561.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    Nadlesnictwo Marcule
    rynek drzewny
    drewno
    podaz
    ceny
    zmiennosc sezonowa
    szeregi czasowe
    timber market
    seasonal fluctuations
    cyclic fluctuations
    variation in timber prices
    Opis:
    The objective of the study was to identify and analyze long−term trends as well as cyclic, seasonal, and irregular effects in timber volume and prices by means of time series decomposition. The adopted multiplicative model was the product of all the time series components identified using the Census X11 method. The study material consisted of quarterly data on the volume and prices of timber sold by the Marcule Forest District (central Poland) in the years 2006−2018. Analysis was performed for the overall timber production volume, as well as separately for pine timber (constituting 86% of the total) and oak timber (5%), taking into account large−diameter saw timber (WC0) and medium−diameter industrial and general purpose timber (pulpwood, S2A). Over the analyzed period, the nominal prices of timber rose on average by 39% from 165 to 229 PLN/m3. The greatest price increase was recorded for large−diameter oak timber (by 100%), while the prices of WC0 pine timber, which accounted for the greatest proportion of the production volume, increased by 23% on average. Production characterized marked seasonality throughout the year, depending on the species. Pine timber sales were the lowest in 1st quarter and the highest in 3rd one, while oak timber sales were the lowest in 3rd quarter and the highest in 4th one. The seasonal effect accounted for the largest proportion of variation in timber production volume. The seasonality of timber prices was negatively correlated with production. The highest prices for pine and oak timber were obtained in 1st and 2nd quarters respectively, when the production volume of those timber species was the lowest. Conversely, the lowest prices were recorded in seasons characterized by the greatest production volume, i.e., in 3rd quarter for pine and in 4th quarter for oak. The decomposition of overall variation in timber prices into its components, which can be predicted (cyclic and seasonal fluctuations as well as long−term trend), and those that are difficult to forecast (irregular effect) is of great significance for timber sales management as the results can be used to improve timber price forecasting.
    Źródło:
    Sylwan; 2019, 163, 10; 820-829
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wpływu zakłóceń na wybrane parametry doju w dojarce rurociągowej
    Analysis of the impact of disturbances on selected milking parameters in a pipeline milking machine
    Autorzy:
    Skalska, D.
    Nejman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/292142.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    dojarka rurociągowa
    wahania cykliczne
    zakłócenie
    pulsacja
    pipeline milking machine
    cyclic
    irregular fluctuations
    disturbance
    pulsation
    Opis:
    Analizowano zmiany średniego podciśnienia P14 oraz jego wahania aP14 w rurociągu mlecznym, w dojarce przewodowej przy pracy sześciu aparatów udojowych, podłączanych do instalacji kolejno i średnie podciśnienie ssania pss w aparacie udojowym po wpuszczeniu zakłócenia (10 l normalnego powietrza, 10 l normalnego powietrza sprężonego do 2 at., 20 l normalnego powietrza sprężonego do 3,5 at.) do rurociągu mlecznego. Wykazano istotny wpływ wielkości amplitudy i kształtu zakłócenia oraz całkowitego zadanego strumienia cieczy z aparatów udojowych Qmr w pierwszym cyklu pulsacji po wprowadzeniu zakłócenia (powietrza) do rurociągu mlecznego i w trzech następnych cyklach pulsacji po wprowadzeniu ww. zakłócenia na spadek podciśnienia P14 oraz na jego amplitudę wahań aP14 w strefie pracujących aparatów (w rurociągu mlecznym). Średnie podciśnienie ssania pss w aparacie udojowym jest również istotnie zależne od ww. warunków.
    The research involved the analysis of changes in average negative pressure P14 and its fluctuations aP14 in a milk pipeline of a milking machine during work of six milking apparatuses (each of them was connected to the installation in turn). The other analysed parameter was average negative pressure of suction pss in milking apparatus after letting a disturbance into the milk pipeline (10 l of normal air, 10 l of normal air compressed to 2 atm, 20 l of normal air compressed to 3.5 atm). The research has proven considerable impact of amplitude size and disturbance shape and total preset stream of liquid from milking apparatuses Qmr during the first pulsation cycle after letting the disturbance (air) into the milk pipeline and during the next three pulsation cycles after letting in the abovementioned disturbance on the drop of negative pressure P14 and on its fluctuation amplitude aP14 in the zone of working apparatuses (in a milk pipeline). Average negative pressure of suction pss in a milking apparatus is also significantly dependent on the above-mentioned conditions.
    Źródło:
    Inżynieria Rolnicza; 2008, R. 12, nr 5(103), 5(103); 249-257
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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