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Wyświetlanie 1-7 z 7
Tytuł:
Nowcasting Quarterly GDP Dynamics in the Euro Area – The Role of Sentiment Indicators
Autorzy:
Gajewski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/632857.pdf
Data publikacji:
2014-06-01
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
nowcasting
sentiment indicators
kluczowe prognozowanie bieżące
wskaźniki koniunktury
Opis:
The paper compares the most closely watched sentiment indicators with respect to their ability to nowcast quarterly GDP dynamics in the Euro Area and its biggest economies. We analyse cross-correlations and out-of-sample forecast errors generated from equations estimated by rolling regressions in fixed-length window. The results show that models employing PMI Composite perform best in the cases of the Euro Area, Germany, France and Italy, whilst Spanish GDP dynamics is best nowcasted using ESI-based models. PMI-based models generate the most accurate nowcasts at the beginning of the quarter, as well as during periods of high volatility of GDP growth rates
W artykule porównane zostały zdolności najpilniej obserwowanych wskaźników obrazujących nastroje gospodarcze do bieżącego prognozowania kwartalnej dynamiki PKB w strefie euro i jej największych państwach członkowskich. Analizowane są korelacje krzyżowe oraz błędy prognoz poza próbę, wygenerowane z równań szacowanych w oparciu o regresję kroczącą w oknie stałej długości. Wyniki wskazują, że modele wykorzystujące wskaźnik PMI Composite dają na ogół najlepsze wyniki w strefie euro, Niemczech, Francji i Włoszech, podczas gdy bieżąca dynamika hiszpańskiego PKB jest najprecyzyjniej prognozowana przez modele oparte na wskaźniku ESI. Modele oparte na PMI generują relatywnie najlepsze prognozy na początku kwartału, a także w okresach wysokiej zmienności stóp wzrostu PKB.
Źródło:
Comparative Economic Research. Central and Eastern Europe; 2014, 17, 2; 5-23
1508-2008
2082-6737
Pojawia się w:
Comparative Economic Research. Central and Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demand and supply shock symmetry across Polish voivodeships
Autorzy:
Gajewski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/414012.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warszawski. Instytut Ameryk i Europy. Centrum Europejskich Studiów Regionalnych i Lokalnych (EUROREG)
Tematy:
demand shocks
supply shocks
voivodeships
monetary policy
Opis:
The aim of this paper is to evaluate the symmetry of demand and supply shocks affecting Polish voivodeships and to assess the risk of asymmetric shocks in the future. The study employs the SVAR-based Blanchard and Quah (1989) decomposition as modified by Bayoumi and Eichengreen (1992), and uses a new method of estimating quarterly GDP by voivodeships. The results point to a relatively high symmetry of shocks and a rather low risk of their occurrence. Shock asymmetry does not appear to be strongly related to differences in production structures, which is claimed in most theoretical approaches, including the Optimum Currency Areas Theory.
Źródło:
Studia Regionalne i Lokalne; 2018, 3(73); 50-69
1509-4995
Pojawia się w:
Studia Regionalne i Lokalne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accurate Location of Fiber Cable Fault with OTDR
Autorzy:
Borzycki, Krzysztof
Gajewski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2058489.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
fault location
fiber optic cable
helix factor
OTDR
single-mode fiber
Opis:
The paper reviews the factors limiting the accuracy of locating a fiber optic cable fault when using an optical time domain reflectometer (OTDR) and describes an error estimation method for typical use cases. The primary source of errors lies in the complex relationship between the length of the optical fiber (measured by OTDR), its routing, cable design depending on cable design and type of installation (i.e. duct, directly buried, aerial) as well as the spare lengths used for service purposes. The techniques which considerably improve the accuracy of the fault localization processes are presented, the importance of accurate documentation of the network and of referencing the fault location to the nearest splice instead of end of the line are discussed, as is the absence of cable helix factor in data sheets.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 4; 42--52
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State-level Taylor rule and monetary policy stress
Autorzy:
Duran, Hasan Engin
Gajewski, Pawel
Powiązania:
https://bibliotekanauki.pl/articles/22443107.pdf
Data publikacji:
2023
Wydawca:
Instytut Badań Gospodarczych
Tematy:
Taylor Rule
states
monetary stress
spatial panel regression
FMOLS
DOLS
Opis:
Research background: Taylor rule is a widely adopted approach to follow monetary policy and investigate various mechanisms related to or triggered by monetary policy. To date, no in-depth examination of scale, determinants and spillovers of state-level monetary policy stress, stemming from the Federal Reserve Board?s (Fed?s) policy has been performed. Purpose of the article: This paper aims to investigate the nature of monetary policy stress on US States delivered by the single monetary policy by using a quarterly dataset spanning the years between 1989 and 2017. Methods: We apply a wide array of time series and panel regressions, such as unit root tests, co-integration tests, co-integrating FMOLS and DOLS regressions, and Spatial Panel SAR and SEM models. Findings & value added: When average stress imposed on states is calculated, it is observed that the level of stress is moderate, but the distribution across states is asymmetric. The cross-state determinants behind the average stress show that states with a higher percentage of working-age and highly educated population, as well as those with higher population density and more  export-oriented are negatively stressed (i.e. they experience excessively low interest rates), whereas higher unemployment rate contributes to a positive stress (too high interest rates). To the best of our knowledge, the contribution of this paper lies in estimating monetary policy stress at the state level and unveiling some of the determinants of this stress. Moreover, the paper makes the first attempt to empirically test spatial spillovers of the stress, which are indeed found significant and negative.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2023, 18, 1; 89-120
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Floristic diversity, yielding and calorific value of plant communities with dominant native grass species
Różnorodność florystyczna, plonowanie i wartość energetyczna zbiorowisk z dominacją rodzimych gatunków traw
Autorzy:
Grzelak, Mieczysław
Gaweł, Eliza
Gajewski, Piotr
Kaczmarek, Paweł
Majchrzak, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/336114.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
calorific value
biomass
grass communities
heat of combustion
wartość energetyczna
biomasa
zbiorowiska trawiaste
ciepło spalania
Opis:
Studies on floristic diversity, yielding and calorific value of biomass of communities with a dominance of 10 native grass species were conducted in the years 2013-2018 over an area of 180 ha in the Noteć River valley in the Trzcianka–Wieleń– Krzyż Wielkopolski stretch. The species composition, the percentage shares of the dominant species and the other plant groups were investigated in these plant communities. Moreover, habitat conditions, yielding and fodder value were determined. The calorific value, heat of combustion, ash content and moisture content in a dry biomass were recorded. Results indicate that the investigated communities differ in terms of habitat conditions, floristic composition, as well as yielding and fodder value of the sward. Moreover, harvested plant biomass characterised by high calorific value and heat of combustion as well as low ash content, thus facilitating pellet production for energy generation.
Badania nad różnorodnością florystyczną, plonowaniem oraz wartością energetyczną biomasy zbiorowisk z dominacją 10 gatunków rodzimych traw, przeprowadzono w latach 2013-2018 w dolinie Noteci, na odcinku Trzcianka–Wieleń–Krzyż Wlkp., na obszarze o powierzchni 180 ha. Określono skład botaniczny zbiorowisk, procentowy udział dominanta oraz pozostałych grup roślinnych. Ponadto określono warunki siedliskowe, plonowanie oraz wartość użytkową. Zbadano wartość energetyczną, ciepło spalania, zawartość popiołu i wilgotność w suchej masie. Otrzymane wyniki wskazują, że badane zbiorowiska różnią się uwarunkowaniami siedliskowymi składem florystycznym, a także pod względem plonowania i wartości użytkowej runi. Ponadto, zebraną masę roślinną cechuje wysoka wartość energetyczna i ciepło spalania oraz niska zawartość popiołu, co umożliwia produkcję z niej peletu dla celów energetycznych.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2019, 64, 2; 25-28
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The microbiological, histological, immunological and molecular determinants of Helicobacter pylori infection in guinea pigs as a convenient animal model to study pathogenicity of these bacteria and the infection dependent immune response of the host
Autorzy:
Walencka, Maria
Gonciarz, Weronika
Mnich, Eliza
Gajewski, Adrian
Stawerski, Pawel
Knapik-Dabrowicz, Alina
Chmiela, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1038889.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Helicobacter pylori
guinea pigs
diagnostic procedures
Opis:
Helicobacter pylori is an etiological agent of chronic gastritis, gastric and duodenal ulcers and gastric cancers. The use of an appropriate animal model for experimental studies on the pathogenesis of H. pylori infections is necessary due to the chronic character of such infections and difficulties in identifying their early stage in humans. The aim of this study was to develop a guinea pig model of H. pylori infection and identify its microbiological, histological, serological and molecular determinants. Guinea pigs were inoculated per os with H. pylori strains: CCUG 17874 or ATCC 700312, both producing vacuolating cytotoxin A (VacA) and cytotoxin associated gene A (CagA) protein, suspended in Brucella broth with fetal calf serum (FCS) and Skirrow supplement of antibiotics. To determine H. pylori colonization, 7 and 28 days after the challenge, a panel of diagnostic methods was used. It included culturing of microorganisms from the gastric tissue, histopathological analysis of gastric sections, stained by Mayer,s haematoxylin and eosin to assess inflammatory response, by Giemsa as well as Warthin-Starry silver staining to visualise Helicobacter-like organisms (HLO) and with anti-Ki-67 antigen to assess epithelial cell proliferation. H. pylori infection was also confirmed by polymerase chain reactions (PCR) for detection in gastric tissue of ureC and cagA genes and by serological assessment of H. pylori antigens in faeces. This study showed the usefulness of microbiological, histological, immunological and molecular methods for the detection of persistent H. pylori infections in guinea pigs, which could be an appropriate model for studying H. pylori pathogenesis and the related immune response against these microbes.
Źródło:
Acta Biochimica Polonica; 2015, 62, 4; 697-706
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immunoregulation of antigen presenting and secretory functions of monocytic cells by Helicobacter pylori antigens in relation to impairment of lymphocyte expansion
Autorzy:
Mnich, Eliza
Gajewski, Adrian
Rudnicka, Karolina
Gonciarz, Weronika
Stawerski, Paweł
Hinc, Krzysztof
Obuchowski, Michał
Chmiela, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1038873.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
H. pylori
antigen presenting cells
lymphocyte expansion
Opis:
The role of Helicobacter pylori (H. pylori) antigens in driving a specific immune response against the bacteria causing gastroduodenal disorders is poorly understood. Using a guinea pig model mimicking the natural history of H. pylori infection, we evaluated the effectiveness of immature and mature macrophages in promoting the blastogenesis of splenocytes from H. pylori infected and uninfected animals, in response to H. pylori antigens: glycine acid extract (GE), cytotoxin associated gene A protein (CagA), urease A (UreA) and lipopolysaccharide (LPS). Lymphocyte expansion was assessed in 72 h cell cultures, containing: immature or mature macrophages derived from bone marrow monocytes, unstimulated or stimulated with H. pylori antigens for 2 h. The proliferation was expressed as a ratio of [3H]-thymidine incorporation into DNA of antigen-stimulated to unstimulated cells and the DNA damage was determined by DAPI cell staining. TGF-β and IFN-γ were assessed immunoenzymatically in cell culture supernatants. Lymphocytes of control and H. pylori-infected animals proliferated intensively in response to phytohaemagglutinin (PHA) and in co-cultures with immature or mature macrophages treated with CagA or UreA (significantly) and GE (slightly) exluding the cultures containing H. pylori or E. coli LPS. This lymphocyte growth inhibition was related to DNA damage of monocytic cells in response to H. pylori or E. coli LPS and secretion of regulatory TGF-β, but not proinflammatory IFN-γ. Impaired homeostasis of monocytic cell function related to DNA damage and TGF-β release, in response to H. pylori LPS may lead to the suppression of adaptive immune response against the bacteria and development of chronic infection.
Źródło:
Acta Biochimica Polonica; 2015, 62, 4; 641-650
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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