Provider: - Institution: University of Zagreb. Faculty of Science. Department of Geophysics. - Data provided by Europeana Collections- Intenzivne konvektivne oluje često predstavljaju potencijalnu ...opasnost za ljudski život i materijalna dobra, dok je vrijeme i mjesto nastanka te intenzitet istih još uvijek teško predvidiv i predstavlja jedan od najvećih izazova u prognozi vremena. Izuzetnu važnost u prognozi konvekcije imaju satelitski podaci i podaci o munjama, a njihovo karakteristično ponašanje prije i tijekom grmljavinskih oluja može uvelike poboljšati prognozu neposrednog razvoja vremena (eng. nowcasting). U ovom radu korišteni su podaci s geostacionarnih satelita druge generacije Meteosat-9 i Meteosat-10 te podaci o munjama iz međunarodnog LINET (od eng. LIghnting NETwork) sustava. Uspoređene su četiri objektivne satelitske metode koje se temelje na kombinaciji satelitskih kanala u infracrvenom dijelu spektra i služe za detekciju premašujućeg vrha (OT, od eng. Overshooting Top) iznad nakovnja kumulonimbusa (Cb), koji je posljedica jake uzlazne struje unutar konvektivne ćelije. Utvrđeno je da najmanji broj pogrešnih detekcija ima nova jednostavna objektivna satelitska metoda, nazvana COMB (od eng. COMBination). Većina pogrešno detektiranih OT-ova koristeći spomenutu metodu nalazila se u području specifičnih termičkih oblika na vrhovima konvektivnih oblaka (hladnog prstena ili hladnog U/V) koji su također karakteristični za intenzivnu konvektivnu aktivnost. U blizini detektiranih OT-ova najčešće dolazi do olujnih udara vjetra koji su često praćeni intenzivnim pljuskom, dok je u značajnom broju slučajeva zabilježen i izražen pad temperature. Analizom grmljavinske aktivnosti nad promatranim područjem utvrđeno je da su grmljavinski najaktivnija pred-alpska područja, a u Hrvatskoj Istra u ljeto i južni Jadran tijekom jesenskih mjeseci. Neposredno prije ili za vrijeme OT-a te prije pojave tuče pri tlu opažen je nagli porast broja ukupnih električnih izboja, izmjerene su najviše amplitude struje i opažen porast srednje visine munja između i unutar oblaka.- Extended abstract in the dissertation (pp. ii-x)- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: University of Zagreb. Faculty of Science. Department of Geophysics. - Data provided by Europeana Collections- In this dissertation, the local similarity scaling approach was ...examined based on the multi-level measurements of atmospheric turbulence in the wintertime (December 2008 February 2009) stable atmospheric boundary layer (SBL) established over a heterogeneous surface influenced by mixed agricultural, industrial and forest surfaces. The 62 m tower (levels 20, 32, 40, 55 and 62 m above ground) was situated in the middle of some 120 m × 480 m area of hc = 18 m high walnut trees. The heterogeneity of the surface was characterized by spatial variability of both roughness and topography. In a first step local similarity theory in terms of flux-variance and flux-gradient relationships was investigated. Nieuwstadts local scaling approach was found to be suitable for the representation of all three wind velocity components. The roughness sublayer (RSL) influenced wind variances, and consequently the turbulent kinetic energy (TKE) and correlation coefficients at the lowest measurement level, but not the wind shear profile. After removing data points associated with the flux Richardson number (Rf) greater than 0.25, the observations support the classical linear expressions for the dimensionless wind shear (phim) even over inhomogeneous terrain. Leveling-off of phim at higher values of stability parameter was found to be a result of the large number of data characterized by small-scale turbulence (Rf > 0.25). Deviations from linear expressions were shown to be mainly due to small-scale turbulence rather than due to the surface heterogeneities, supporting the universality of the linear relationship. Additionally, the flux-gradient dependence on stability did not show different behavior for different wind regimes, indicating that the stability parameter is a sufficient predictor for flux-gradient relationships. Data followed the local z-less scaling for phim when the prerequisite Rfless than or equal to0.25 was imposed. Further investigations focused on the combined influence of the RSL found above tall vegetation and the internal boundary layer (IBL) on the turbulence spectral characteristics and TKE budget. The traditional surface layer scaling was tested against the canopy scaling, which is generally valid for the RSL. It was found that canopy scaling can be successfully applied even within the transition layer. For the present complex site local isotropy was not found. Vertical velocity spectra were smaller than horizontal spectra. Similarly, dissipation rates (epsilon) determined only from vertical spectra were smaller than epsilon estimates based on horizontal components. Therefore, it was necessary to normalize vertical wind speed spectra with phiepsilonw in order to get good correspondence with the Kansas spectral models. Extending the analysis to the Olesen approach, applied for the first time to the SBL over heterogeneous terrain, normalized spectra collapsed to one single curve. Finally, analyzing the budget terms of the TKE equation, non-equilibrium conditions were found. The non-local dynamics are considered to be the main reason for the observed imbalance of TKE in the transition layer as well as for the observed breakdown of z-less regime in the strongly stable conditions above heterogeneous surface. In the RSL, the turbulent transport of TKE above vegetated canopies is considered to be the main cause of the observed TKE imbalance in the neutral conditions. A less systematic behavior of the residual term was observed indicating that the advection term has more pronounced influence on the RSL than the upper levels.- In this dissertation, the local similarity scaling approach was examined based on the multi-level measurements of atmospheric turbulence in the wintertime (December 2008 February 2009) stable atmospheric boundary layer (SBL) established over a heterogeneous surface influenced by mixed agricultural, industrial and forest surfaces. The 62 m tower (levels 20, 32, 40, 55 and 62 m above ground) was situated in the middle of some 120 m × 480 m area of hc = 18 m high walnut trees. The heterogeneity of the surface was characterized by spatial variability of both roughness and topography. In a first step local similarity theory in terms of flux-variance and flux-gradient relationships was investigated. Nieuwstadts local scaling approach was found to be suitable for the representation of all three wind velocity components. The roughness sublayer (RSL) influenced wind variances, and consequently the turbulent kinetic energy (TKE) and correlation coefficients at the lowest measurement level, but not the wind shear profile. After removing data points associated with the flux Richardson number (Rf) greater than 0.25, the observations support the classical linear expressions for the dimensionless wind shear (phim) even over inhomogeneous terrain. Leveling-off of phim at higher values of stability parameter was found to be a result of the large number of data characterized by small-scale turbulence (Rf > 0.25). Deviations from linear expressions were shown to be mainly due to small-scale turbulence rather than due to the surface heterogeneities, supporting the universality of the linear relationship. Additionally, the flux-gradient dependence on stability did not show different behavior for different wind regimes, indicating that the stability parameter is a sufficient predictor for flux-gradient relationships. Data followed the local z-less scaling for phim when the prerequisite Rfless than or equal to0.25 was imposed. Further investigations focused on the combined influence of the RSL found above tall vegetation and the internal boundary layer (IBL) on the turbulence spectral characteristics and TKE budget. The traditional surface layer scaling was tested against the canopy scaling, which is generally valid for the RSL. It was found that canopy scaling can be successfully applied even within the transition layer. For the present complex site local isotropy was not found. Vertical velocity spectra were smaller than horizontal spectra. Similarly, dissipation rates (epsilon) determined only from vertical spectra were smaller than epsilon estimates based on horizontal components. Therefore, it was necessary to normalize vertical wind speed spectra with phiepsilonw in order to get good correspondence with the Kansas spectral models. Extending the analysis to the Olesen approach, applied for the first time to the SBL over heterogeneous terrain, normalized spectra collapsed to one single curve. Finally, analyzing the budget terms of the TKE equation, non-equilibrium conditions were found. The non-local dynamics are considered to be the main reason for the observed imbalance of TKE in the transition layer as well as for the observed breakdown of z-less regime in the strongly stable conditions above heterogeneous surface. In the RSL, the turbulent transport of TKE above vegetated canopies is considered to be the main cause of the observed TKE imbalance in the neutral conditions. A less systematic behavior of the residual term was observed indicating that the advection term has more pronounced influence on the RSL than the upper levels.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Gravimeter station on Lake Balaton. Lake Balaton in winter, nature, landscape, geophysics- Graviméter állomás a Balatonon.- All ...metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- TartalomElőszóBevezetésMinél előbb megoldandó feladatok I.1. H-Magyarország állam- és jogrendje I.2. H-Magyarország energia ...tartalékai I.3. H-Magyaroszág élettér lehetőségei I.4. H-Magyarország természeti kincsek tartalékai I.5. H-Magyarország környezetvédelmi lehetőségei I.6. H-Magyarország heliocentrikus alkotmánya I.7. Heliocentrikus paradigmák I.7.1. Terresztriális paradigmák I.7.2. Extra-terresztriális paradigmák I.8. Vonatkoztatási rendszerek I.8.1. A vonatkoztaási rendszerek szerepe a természet törvényeinek a megismerésében I.8.2. A vonatkoztatási rendszerek szerepe a társadalmi folyamatokban történő jobb eligazodásban I.9. Gondolkodjunk és cselekedjünk naprendszer méretekben I.9.1. Heliocentrikus nemzetközi központ I.10. Heliocentrikus társadalmak I.11. Heliocentrikus járművek I.12. A gyártás beindításához a gyártandó eszköz készletek I.13. Heliocentrikus média, írott sajtó, rádió, televízió, internet- Illusztrált.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Gana je zemlja iznimno bogata geološkim mineralnim resursima s kontrastnim topografskim reljefom i raznolikim geofizičkim okruženjem. U ovom se članku procjenjuje geologija i geofizika Gane s ...posebnim naglaskom na utjecaj geološkog okruženja i topografije na gravitaciju. Konkretno, procjenjuje se kako varijacije u geologiji, topografiji, krajolicima i okolišu kontroliraju geofizičke parametre i kako se oni razlikuju među glavnim regijama zemlje - bazen Volte, Sjeverne ravnice, Ashanti-Kwahu (Kumasi) i obalne ravnice u okruženju Akre. Prethodne studije, koje su koristile tradicionalne pristupe s pomoću geoinformacijskih sustava (GIS), dokumentirale su geološku evoluciju Gane koja je evoluirala kao dio zapadnoafričkog kratona. Kao doprinos postojećem istraživanju, ovaj članak daje regionalnu analizu Gane integriranim kartiranjem geologije, geofizike i topografije te zemlje. Tehnički se pristup ovog istraživanja fokusira na upotrebu kartografskog skupa alata za skriptiranje na konzoli (Generic Mapping Tools − GMT) integriranog s QGIS-om za obradu i kartiranje skupova podataka: Opća batimetrijska karta oceana (General Bathymetric Chart of the Oceans − GEBCO) i Gravitacijski model Zemlje 2008 (Earth Gravitational Model 2008 − EGM-2008). Teorijska se pozadina temelji na geološkim istraživanjima zapadne Afrike potkrijepljenima podatcima visoke razlučivosti. Rad definira konceptualni kartografski okvir za integriranu geološku i geofizičku vizualizaciju u projektu kartiranja na regionalnoj razini u Gani.
Provider: - Institution: - Data provided by Europeana Collections- Tartalom ◊ Bevezetés ◊ Eötvös Loránd tudományos munkáiból ◊ Eötvös Loránd: A Föld alakjának kérdése. ◊ Eötvös Loránd: A Föld vonzása ...különböző anyagokra ◊ Roland Eötvös: Über die Anziehung der Erde auf Verschiedene Substanzen ◊ Eötvös Loránd: A torziós ingával végzett munkálatokról ◊ Roland Eötvös: Über Arbeiten mit der Drehwaage ◊ Roland Eötvös: Über den Zusammenhang der Oberflächenspannung mit dem Molekularvolumen ◊ Eötvös Loránd tudománypolitikai munkáiból ◊ Eötvös Loránd: Néhány szó az egyetemi tanítás kérdéséhez ◊ Eötvös Loránd: Akadémia elnöki megnyitó beszéd, 1889. június 24. ◊ Eötvös Loránd: Az egyetem feladatáról. ◊ Eötvös Loránd: A fizika tanításáról az egyetemen. ◊ Eötvös Loránd: A tudományos akadémiák létjoga. ◊ Levelek, versek, dokumentumok ◊ Eötvös Loránd levele édesanyjához 1857. július 21.-én ◊ Eötvös Loránd levele édesapjához 1862. augusztus 9.-én ◊ Eötvös Loránd és Eötvös József levelezése ◊ Eötvös Loránd néhány fiatalkori verse ◊ Eötvös Loránd miniszteri kinevezésének dokumentumai ◊ Eötvös Loránd életéről és munkásságáról ◊ Részletek a "Báró Eötvös Loránd Emlékkönyv"-ből ◊ Berzeviczy Albert ig. és T. T. elnök úr megnyitó beszéde: A két Eötvös ◊ Kozma Andor: Eötvös Loránd ◊ Fröhlich Izidor: Báró Eötvös Loránd emlékezete ◊ Pekár Dezső: Báró Eötvös Loránd alkotásainak jelentősége a tudományban ◊ és a gyakorlati életben. ◊ M. Zemplén Jolán-Egyed László: Eötvös Loránd ◊ Renner János: Az Eötvös-kísérlet ◊ Bod László, Ephraim Fischbach, Marx György, Nárayné Ziegler Mária: ◊ Az Eötvös-kísérlet száz éve ◊ One Hundred Years of the Eötvös Experiment ◊ Radnai Gyula: Eötvös akadémiai elnöki megnyilatkozásai ◊ Király Péter: Eötvös and STEP ◊ Károlyi Zsigmond: Eötvös Loránd Bibliográfia ◊ I. Eötvös Loránd irodalmi munkássága ◊ II. Eötvös Lorándra vonatkozó irodalom ◊ Einige Arbeiten von Loránd Eötvös 1848 - 1919 ◊ Über die Anziehung der Erde auf Verschiedene Substanzen ◊ Über Arbeiten mit der Drehwaage Ausgeführt im Auftrage der Kön. Ungarischen ◊ Regierung in den Jahren 1908-1911 ◊ Über den Zusammenhang der Oberflächenspannung mit dem Molekularvolumen ◊ About Loránd (Roland) Eötvös ◊ L.Bod, E.Fischbach, G.Marx, M.Nárayné Ziegler: One Hundred Years of the ◊ Eötvös Experiment ◊ Péter Király: Eötvös and STEP ◊ Loránd Eötvös Virtual Museum (maintained by the Eötvös Loránd Geophysical ◊ Institute)- javított változat- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain ...Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Subject date: 19-20. sz.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 ...Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- A Magyar Karszt- és Barlangkutató Társulat időszaki kiadványa, mely összegyűjti és közzéteszi az elmúlt időszak legfontosabb, ...magyarországi és külföldi karszt- és barlangkutatással kapcsolatos eredményeit és eseményeit.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
