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Wyświetlanie 1-15 z 358
Tytuł:
Short period changes of soil temperature against advective changes of air temperature in Hornsund, Spitsbergen
Autorzy:
Miętus, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/2053233.pdf
Data publikacji:
1988
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
soil temperature
Źródło:
Polish Polar Research; 1988, 9, 1; 95-103
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perception of Changes in Spectrum and Envelope of Musical Signals vs Auditory Fatigue
Autorzy:
Kin, M. J.
Dobrucki, A.
Powiązania:
https://bibliotekanauki.pl/articles/177797.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
perception of spectral changes
temporary threshold shift
listening fatigue
Opis:
The paper presents results of research on an influence of listening fatigue on the detection of changes in spectrum and envelope of musical samples. The experiment was carried out under conditions which normally exist in a studio or on the stage when sound material is recorded and/or mixed. The equivalent level of presented sound samples is usually 90 dB and this is an average value of sound level existing in control room at various recording activities. Such musical material may be treated as a noise so Temporary Threshold Shift phenomenon may occur after several sessions and this may lead to a listening fatigue effect. Fourteen subjects participated in the first part of the experiment and all of them have the normal hearing thresholds. The stimuli contained the musical material with introduced changes in sound spectrum up to ±6 dB in low (100 Hz), middle (1 kHz) and high frequency (10 kHz) octave bands. In the second part of research five subjects listened to musical samples with introduced envelope changes up to ±6 dB in interval of 1 s. The time of loud music exposure was 60, 90 and 120 minutes and this material was completely different from the tested samples. It turned out that listening to the music with an Leq = 90 dB for 1 hour influences the hearing thresholds for middle frequency region (about 1–2 kHz) and this has been reflected in a perception of spectral changes. The perceived peaks/notches of 3 dB have the detection ability at 70% and the changes of low and high ranges of spectrum were perceived at the similar level. After the longer exposure, the thresholds shifted up to 4.5 dB for the all investigated stimuli. It has been also found that hearing fatigue after 1 hour of a listening influences the perception of envelope which gets worse of 2 dB in comparison to the fresh-ear listening. When time of listening to the loud music increases, the changes in envelopes which can be detected rise to the value of 6 dB after 90-minutes exposure and it does not increase with further prolongation of listening time.
Źródło:
Archives of Acoustics; 2016, 41, 2; 323-330
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of accepting biological changes during adolescence on the severity of depression symptoms
Autorzy:
Radziwiłłowicz, Wioletta
Hrycyk, Paulina
Dutczak, Beata
Powiązania:
https://bibliotekanauki.pl/articles/2128327.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
depression symptoms
puberty
acceptance of body changes
body image measures
body shame
Opis:
The aim of the study was to establish whether any relation exists between depression symptoms and the extent to which adolescents accept the changes their bodies undergo (the physical changes they experience at different stages of growing up), and if the connection does exist – is it gender-related. Method: Data were collected from four sub-groups: younger girls (aged 12–13), older girls (aged 17–18), younger boys (aged 12–13), and older boys (aged 17–18). The participants were asked to complete questionnaires that allow to measure the subjective intensity of depression symptoms (BDI), the current stage of biological changes (the Tanner scale) and whether these changes are accepted by the individual who experiences them (the original Feelings Towards the Body questionnaire). Results: The less adolescents accept the changes in their bodies, the higher depression symptoms they demonstrate. For younger girls, older girls and older boys, no links were established between levels of accepting bodily changes and early/late maturation (in comparison with the population of their peers). For younger boys, the later the stage of their development, the less likely they are to accept the changes in their bodies. Girls report more intense depression symptoms than boys do, but their levels of accepting changes that occur around puberty are significantly lower only when compared to those of older boys. Conclusions: Whether biological changes during puberty (mainly feelings of anxiety and shame related to the body) are accepted or not, was proven to be a significant predictor of more intense depression symptoms.
Źródło:
Polish Psychological Bulletin; 2016, 4; 394-401
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrological changes in the Lublin Polesie during the Late Glacial and Holocene as reflected in the sequences oflacustrine and mire sediments
Autorzy:
Bałaga, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/2027411.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Lublin Polesie
Late Glacial
Holocene
hydrological changes
pollen analysis
Opis:
The paleoecological research of biogenie sediments sampled in the different lake-mire ecosystems of the Łęczna Włodawa Lake District were the basis of studies on hydrological changes during the Late Glacial and Holocene. The lithological differentiation (spatial and temporal) of lacustrine and mire sediments in the studied sites indicates that the hydrological changes were of local nature. The investigations also evidence a specific functioning of the lakes in this region. Lake basins were formed as a result of the ground ice degradation and the transformation of groundwater circulation in the Late Glacial. The total area of lakes in the Lake District was the largest from the Younger Dryas to the Subboreal chronozone. The gradual lowering ofwater level during the early Holocene resulted in the transformation of sedimentation process, and in the development of typologically differentiated mires and lacustrinc-mire complexes.
Źródło:
Studia Quaternaria; 2002; 37-53
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bariery i uwarunkowania zmian
Barriers and conditions of changes
Autorzy:
Kowalewski, Adam
Nowak, Maciej J.
Powiązania:
https://bibliotekanauki.pl/articles/2025052.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2018, 182, 1; 146-152
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Holocene water-level changes in Lake Iso Lehmälampi, Southern Finland, reflected in subfossil Cladocerans and Chironomids
Autorzy:
Nevalainen, Liisa
Luoto, Tomi P.
Sarmaja- Korjonen, Kaarina
Powiązania:
https://bibliotekanauki.pl/articles/2026067.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Chironomidae
Cladocera
climate
Finland
late Holocene
lake-level changes
Opis:
Anal y ses of subfossil cladocerans (Crustacea: Cladocera) and chi rono mids (Diptera: Chironomidae) were ap plied to ex am ine wa ter-level changes in a small and oligotrophic lake in south ern Fin land over the past 2000 years. Ma jor changes in the in ver te brate com mu ni ties oc curred ca. 400 AD on wards when the lit to ral cladoceran Alonella nana started to re place the plank tonic Eubosmina as the dom i nant spe cies and chi rono mids Psectrocladius sordidellus group and Zalutschia zalutschicola in creased. These changes were most likely due to a de creas ing wa ter level and an en larg ing pro por tion of the lit to ral area, pro vid ing suit able veg e ta tive hab i tats, e.g. aquatic bryophytes (mosses), for these taxa. The low er ing wa ter level reached its min i mum just be fore the Me di eval Warm Pe riod, ca. 800–1000 AD, af ter which the lake level rose again and re mained high un til mod ern times. A prom i nent change in the chi rono mid as - sem blages oc curred dur ing the 20th cen tury when Ablabesmyia monilis and Chironomus anthracinus type in creased, pre sum ably due to changes in wa ter chem is try, caused by anthropogenic load of pol lut ants.
Źródło:
Studia Quaternaria; 2008, 25; 33-42
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Changes in the Furan Resins by UV Radiation and Atmospheric Air
Autorzy:
Bobrowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/381893.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
furan resins
furfuryl alcohol
structural changes
spectroscopy FTIR
spectrum FTIR
żywice furanowe
alkohol furfurylowy
zmiany strukturalne
spektroskopia FTIR
widma FTIR
Opis:
In this paper, the results of research of structural changes that occur during in furan resins with different content of furfuryl alcohol by UV radiation and atmospheric air are presented. The research was carried out by transmission method (KBr pellets), using FTIR spectrometer Excalibur 3000 for the three samples of furan resins with different content of furfuryl alcohol. As a result of UV radiation and oxidizing atmosphere only the sample of the resin Kaltharz 8616 remained liquid. Two others (Kaltharz U 404 and Kaltharz 8117) were cured after 1
Źródło:
Archives of Foundry Engineering; 2015, 15, 1 spec.; 5-8
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural and anthropogenic causes of climate changes
Autorzy:
Haman, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/703442.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
climate change
greenhouse effect
climate forecasting
Opis:
The paper gives a short review of the basic physical mechanisms responsible for climate changes with particular attention paid to the structure of the Atmosphere–the Rest of the Earth dynamical system and its chaotic nature. The essence of "greenhouse effect" is explained and input of various natural and anthropogenic factors into it is presented. Problems, difficulties and uncertainties connected with reconstruction of past climates and and forcasting the future are discussed. Particular role of mathematical modelling in understanding and predicting the evolution of climate is emphasized.
Źródło:
Nauka; 2008, 1
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of height changes of GNSS stations from the solutions of short vectors and PSI measurements
Autorzy:
Krynski, J.
Zak, L.
Ziolkowski, D.
Cisak, J.
Lagiewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/145302.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
height changes
GNSS
Persistent Scatterer Interferometry
radar satelitarny
deformacja powierzchni
Opis:
Time series of weekly and daily solutions for coordinates of permanent GNSS stations may indicate local deformations in Earth’s crust or local seasonal changes in the atmosphere and hydrosphere. The errors of the determined changes are relatively large, frequently at the level of the signal. Satellite radar interferometry and especially Persistent Scatterer Interferometry (PSI) is a method of a very high accuracy. Its weakness is a relative nature of measurements as well as accumulation of errors which may occur in the case of PSI processing of large areas. It is thus beneficial to confront the results of PSI measurements with those from other techniques, such as GNSS and precise levelling. PSI and GNSS results were jointly processed recreating the history of surface deformation of the area of Warsaw metropolitan with the use of radar images from Envisat and Cosmo-SkyMed satellites. GNSS data from Borowa Gora and Jozefoslaw observatories as well as from WAT1 and CBKA permanent GNSS stations were used to validate the obtained results. Observations from 2000–2015 were processed with the Bernese v.5.0 software. Relative height changes between the GNSS stations were determined from GNSS data and relative height changes between the persistent scatterers located on the objects with GNSS stations were determined from the interferometric results. The consistency of results of the two methods was 3 to 4 times better than the theoretical accuracy of each. The joint use of both methods allows to extract a very small height change below the level of measurement error.
Źródło:
Geodesy and Cartography; 2017, 66, 1; 73-88
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polish computer magazines: Changes and professionalization of the IT publishing market
Prasa informatyczna w Polsce — zmiany na rynku i profesjonalizacja segmentu
Autorzy:
Ciszek, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/2135674.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Poland's computer press
market changes
professionalization
prasa komputerowa
prasa polska
zmiany na rynku
Źródło:
Rocznik Historii Prasy Polskiej; 2022, 25, 1; 129-141
1509-1074
Pojawia się w:
Rocznik Historii Prasy Polskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the estimation of physical height changes using GRACE satellite mission data – A case study of Central Europe
Autorzy:
Godah, W.
Szelachowska, M.
Krynski, J.
Powiązania:
https://bibliotekanauki.pl/articles/145591.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
satelita GRACE
pole grawitacji
przemieszczenia pionowe
GRACE
height anomaly variations
vertical displacements
physical height changes
Opis:
The dedicated gravity satellite missions, in particular the GRACE (Gravity Recovery and Climate Experiment) mission launched in 2002, provide unique data for studying temporal variations of mass distribution in the Earth’s system, and thereby, the geometry and the gravity fi eld changes of the Earth. The main objective of this contribution is to estimate physical height (e.g. the orthometric/normal height) changes over Central Europe using GRACE satellite mission data as well as to analyse them and model over the selected study area. Physical height changes were estimated from temporal variations of height anomalies and vertical displacements of the Earth surface being determined over the investigated area. The release 5 (RL05) GRACE-based global geopotential models as well as load Love numbers from the Preliminary Reference Earth Model (PREM) were used as input data. Analysis of the estimated physical height changes and their modelling were performed using two methods: the seasonal decomposition method and the PCA/ EOF (Principal Component Analysis/Empirical Orthogonal Function) method and the differences obtained were discussed. The main fi ndings reveal that physical height changes over the selected study area reach up to 22.8 mm. The obtained physical height changes can be modelled with an accuracy of 1.4 mm using the seasonal decomposition method.
Źródło:
Geodesy and Cartography; 2017, 66, 2; 211-226
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 358

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