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  1. Conference proceedings ; Online: Influence of discontinuities in reanalysis ozone concentration data to trend values and significance

    Krizan, P.

    XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)

    2023  

    Abstract: The aim of this poster is to investigate the influence of discontinuities to trend values in ozone concentration data and their significance from the following reanalyses: ERA-5, MERRA-2 and JRA-55. We use the ozone concentration data from all layers ... ...

    Abstract The aim of this poster is to investigate the influence of discontinuities to trend values in ozone concentration data and their significance from the following reanalyses: ERA-5, MERRA-2 and JRA-55. We use the ozone concentration data from all layers between 500 hPa and 1 hPa in the period 1980-2020 in January. This is important topic, because the presence of discontinuities influences the values of trends and their significance. Discontinuities arise from the changing in the assimilation procedure, introducing new observation to the reanalyse, and changing of data quality. There are dates which the occurrence of discontinuities is expected in: 2004- transition from SBUV to EOS Aura data and 2015- the 4.2 MLS data were started to use instead of version 2.2. We search for discontinuities in the following classes of extremity: 1 st , 10 th , 25 th , 50 th ,75 th ,90 th and 99 th percentile as well as the mean. Ozone data with high influence of the discontinuities to trend values and their significance is not suitable for trend analyses.
    Subject code 333
    Language English
    Publishing country de
    Document type Conference proceedings ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book ; Online: The Densification Process of Wood Waste

    Krizan, Peter

    2015  

    Abstract: This book examines the very current issue of wood waste treatment to a solid biofuel for energy recovery. The book is dedicated to research in the densification processes of wood waste and its mathematical description for uniaxial densification into ... ...

    Abstract This book examines the very current issue of wood waste treatment to a solid biofuel for energy recovery. The book is dedicated to research in the densification processes of wood waste and its mathematical description for uniaxial densification into compact biofuels - briquettes.This monograph, derived from an experimental research of densification process in laboratory conditions and also in real technologies in practice, provides a thorough understanding of the influencing parameters impact during densification of wood waste into solid biofuel. The book shows the experimental strategy to determine the effects of individual parameters and specifies their impact on the resulting density of the briquettes. The publication also defines the level of importance of the results in terms of optimization of the densification machine's pressing chamber.Using a designed mathematical model, which was a result of experimental research and which can serve to predict the density of briquettes for some predefined densification conditions and can aid in the design of densification machines, the author has made this topic accessible beyond his discipline, biofuels producers and the academic community
    Keywords Mechanical engineering and machinery ; Technology (General)
    Size 1 electronic resource (184 p.)
    Publisher De Gruyter
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT020090310
    ISBN 9783110440027 ; 9783110441420 ; 3110440024 ; 311044142X
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  3. Article ; Online: Flavour physics as a window to new physics searches.

    Križan, Peter

    Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

    2023  Volume 382, Issue 2266, Page(s) 20230088

    Abstract: Flavour physics is one of the essential elements of the Standard Model (SM). Experimental studies of weak decays of [Formula: see text] and [Formula: see text] mesons at [Formula: see text] factories have, together with the discovery of the Higgs boson ... ...

    Abstract Flavour physics is one of the essential elements of the Standard Model (SM). Experimental studies of weak decays of [Formula: see text] and [Formula: see text] mesons at [Formula: see text] factories have, together with the discovery of the Higgs boson at LHC, provided the final confirmation of the validity of the SM. The present generation of precision flavour physics experiments is looking for departures from the SM. We discuss studies of anomalies in [Formula: see text] hadron decays, and studies of rare decays, which are a very promising method for searching for new physics. This article is part of the theme issue 'The particle-gravity frontier'.
    Language English
    Publishing date 2023-12-18
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 208381-4
    ISSN 1471-2962 ; 0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
    ISSN (online) 1471-2962
    ISSN 0080-4614 ; 0264-3820 ; 0264-3952 ; 1364-503X
    DOI 10.1098/rsta.2023.0088
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 46/25: Show issues
    Z PHI 2: Show issues

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  4. Book ; Online: Assessing the role of planetary and gravity waves in the vertical structure of ozone over midlatitudinal Europe

    Križan, Peter

    eISSN: 1432-0576

    2019  

    Abstract: Planetary and gravity waves play an important role in the dynamics of the atmosphere. They are present in the atmospheric distribution of temperature, wind, and ozone content. These waves are detectable also in the vertical profile of ozone and they ... ...

    Abstract Planetary and gravity waves play an important role in the dynamics of the atmosphere. They are present in the atmospheric distribution of temperature, wind, and ozone content. These waves are detectable also in the vertical profile of ozone and they cause its undulation. One of the structures occurring in the vertical ozone profile is laminae, which are narrow layers of enhanced or depleted ozone concentrations in the vertical ozone profile. They are connected with the total amount of ozone in the atmosphere and with the activity of the planetary and gravity waves. The aim of this paper is to quantify these processes in midlatitudinal Europe. We compare the occurrence of laminae induced by planetary waves (PL) with the occurrence of these induced by gravity waves (GL). We show that the PL are 10–20 times more frequent than that of GL. There is a strong annual variation of PL, while GL exhibit only a very weak variation. With the increasing lamina size the share of GL decreases and the share of PL increases. The vertical profile of lamina occurrence is different for PL and GL smaller than 2 mPa. For laminae greater than 2 mPa this difference is smaller.
    Subject code 551
    Language English
    Publishing date 2019-07-04
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Resistance and Strength of Conductive PLA Processed by FDM Additive Manufacturing.

    Beniak, Juraj / Šooš, Ľubomír / Križan, Peter / Matúš, Miloš / Ruprich, Vít

    Polymers

    2022  Volume 14, Issue 4

    Abstract: There is a large number of materials that can be used for FDM additive manufacturing technology. These materials have different strength properties, they are designed for different purposes. They can be highly strong or flexible, abrasion-resistant, or ... ...

    Abstract There is a large number of materials that can be used for FDM additive manufacturing technology. These materials have different strength properties, they are designed for different purposes. They can be highly strong or flexible, abrasion-resistant, or designed for example for environments with higher thermal loads. However recently new innovative and progressive materials have come to the practice, which include nano-composite particles, bringing new added value. One such material is the Conductive PLA material, which is capable of conducting electric current. The aim of this article is to present the material properties of this material. The article describes the design of the experiment, the process of measuring the resistance of samples printed by FDM device, measuring the maximum tensile strength of samples. The article includes a statistical evaluation of the measured data, with the determination of the significance of individual factors of the experiment as well as the evaluation of the overall result of the experiments.
    Language English
    Publishing date 2022-02-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym14040678
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book ; Online: The densification process of wood waste

    Krizan, Peter

    2015  

    Author's details Peter Krizan
    Language English
    Size Online-Ressource
    Publisher De Gruyter Open
    Publishing place Warsaw u.a.
    Document type Book ; Online
    Note Erscheint als Open Access bei De Gruyter
    ISBN 9783110440010 ; 9783110440027 ; 3110440016 ; 3110440024
    DOI 10.2478/9783110440027
    Database Former special subject collection: coastal and deep sea fishing

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. Book ; Online: The densification process of wood waste

    Krizan, Peter

    2015  

    Author's details Peter Krizan
    Language English
    Size Online-Ressource
    Publisher De Gruyter Open
    Publishing place Warsaw u.a.
    Document type Book ; Online
    Note Erscheint als Open Access bei De Gruyter
    ISBN 9783110440010 ; 9783110440027 ; 3110440016 ; 3110440024
    DOI 10.2478/9783110440027
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  8. Book ; Online: Differences in mid-latitude stratospheric winds between reanalysis data and versus radiosonde observations at Prague

    Kozubek, M. / Laštovička, J. / Križan, P.

    eISSN: 1432-0576

    2018  

    Abstract: Reanalysis data are very useful for studying the stratosphere. They can be used for analysis of long-term trends (temperature, wind speed, humidity, etc.) or analysis of global atmospheric dynamics, etc. There are various reanalysis projects that provide ...

    Abstract Reanalysis data are very useful for studying the stratosphere. They can be used for analysis of long-term trends (temperature, wind speed, humidity, etc.) or analysis of global atmospheric dynamics, etc. There are various reanalysis projects that provide outputs which are not identical. In this paper, we mutually compare three of them, ERA-40, ERA-Interim and NCEP/NCAR, and compare them with balloon radiosonde observations from Prague, Port Hardy and Valentia stations. This comparison is done for wind speed and direction at pressure levels 100 and 10 hPa and for various periods between 1957 and 2009. The results show that the differences between reanalysis vary. Wind speed data from all three analyses reasonably agree except for the 10 hPa historical data before 1966 and particularly ERA-40 data at the end of the data series (1998–2001). The quality of the ERA-40 10 hPa stratospheric wind data has been proven to be substantially worse over the last four ERA-40 years of 1998–2001 (2002) compared to previous years, both in wind speed and wind direction. The reanalysis data results are compared with radiosonde observations from Prague, Port Hardy and Valentia stations at 10 hPa for the months of February between 1989 and 2009. The results show that there are sometimes surprisingly large differences, more for ERA-Interim versus Prague measurements. Differences in wind direction greater than 45° (outliers) between the reanalysis data and Prague observations in wind direction occur in Februaries predominantly when winds in Prague are in "minor" sectors, such as north, northeast and east (easterlies), whereas "major" sectors, particularly the dominant W (westerlies) wind sector, exhibit almost no outliers.
    Subject code 551
    Language English
    Publishing date 2018-09-27
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Simulation study to improve the performance of a whole-body PbF

    Consuegra, Dania / Korpar, Samo / Križan, Peter / Pestotnik, Rok / Razdevšek, Gašper / Dolenec, Rok

    Physics in medicine and biology

    2020  Volume 65, Issue 5, Page(s) 55013

    Abstract: Using Cherenkov radiation in positron emission tomography (PET) has the potential to improve the time of flight (TOF) resolution and reduce the cost of detectors. In previous studies promising TOF results were achieved when lead fluoride ( ... ...

    Abstract Using Cherenkov radiation in positron emission tomography (PET) has the potential to improve the time of flight (TOF) resolution and reduce the cost of detectors. In previous studies promising TOF results were achieved when lead fluoride (PbF
    MeSH term(s) Computer Simulation ; Humans ; Monte Carlo Method ; Phantoms, Imaging ; Positron-Emission Tomography/instrumentation ; Positron-Emission Tomography/methods ; Whole Body Imaging/instrumentation ; Whole Body Imaging/methods
    Language English
    Publishing date 2020-03-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208857-5
    ISSN 1361-6560 ; 0031-9155
    ISSN (online) 1361-6560
    ISSN 0031-9155
    DOI 10.1088/1361-6560/ab6f97
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 199: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  10. Book ; Online: Northern Hemisphere stratospheric winds in higher midlatitudes

    Kozubek, M. / Krizan, P. / Lastovicka, J.

    eISSN: 1680-7324

    longitudinal distribution and long-term trends

    2015  

    Abstract: The Brewer–Dobson circulation (mainly meridional circulation) is very important for stratospheric ozone dynamics and thus for the overall state of the stratosphere. There are some indications that the meridional circulation in the stratosphere could be ... ...

    Abstract The Brewer–Dobson circulation (mainly meridional circulation) is very important for stratospheric ozone dynamics and thus for the overall state of the stratosphere. There are some indications that the meridional circulation in the stratosphere could be longitudinally dependent, which would have an impact on the ozone distribution. Therefore, we analyse here the meridional component of the stratospheric wind at northern middle latitudes to study its longitudinal dependence. The analysis is based on the NCEP/NCAR-1 (National Centers for Environmental Prediction and the National Center for Atmospheric Research), MERRA (Modern Era-Retrospective Analysis) and ERA-Interim (European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis Interim) reanalysis data. The well-developed two-core structure of strong but opposite meridional winds, one in each hemisphere at 10 hPa at higher northern middle latitudes, and a less pronounced five-core structure at 100 hPa are identified. In the central areas of the two-core structure the meridional and zonal wind magnitudes are comparable. The two-core structure at 10 hPa is almost identical for all three different reanalysis data sets in spite of the different time periods covered. The two-core structure is not associated with tides. However, the two-core structure at the 10 hPa level is related to the Aleutian pressure high at 10 hPa. Zonal wind, temperature and the ozone mixing ratio at 10 hPa also exhibit the effect of the Aleutian high, which thus affects all parameters of the Northern Hemisphere middle stratosphere. Long-term trends in the meridional wind in the "core" areas are significant at the 99% level. Trends of meridional winds are negative during the period of ozone depletion development (1970–1995), while they are positive after the ozone trend turnaround (1996–2012). Meridional wind trends are independent of the sudden stratospheric warming (SSW) occurrence and the quasi-biennial oscillation (QBO) phase. The influence of the 11-year solar cycle on stratospheric winds has been identified only during the west phase of QBO. The well-developed two-core structure in the meridional wind illustrates the limitations of application of the zonal mean concept in studying stratospheric circulation.
    Subject code 551
    Language English
    Publishing date 2015-02-27
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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