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1,129 Research products, page 1 of 113

  • Open Access
  • European Commission
  • EU
  • ELTE Digital Institutional Repository (EDIT)

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  • Open Access
    Authors: 
    Csaba Ferencz; G.V. Lizunov; François Crespon; Ivan Price; Ludmil Bankov; Dorota Przepiórka; Klaus Brieß; Denis Dudkin; Andrey Girenko; Valery Korepanov; +10 more
    Country: Hungary
    Project: EC | POPDAT (263240)

    In the frame of the FP7 POPDAT project the Ionosphere Waves Service (IWS) has been developed and opened for public access by ionosphere experts. IWS is forming a database, derived from archived ionospheric wave records to assist the ionosphere and Space Weather research, and to answer the following questions: How can the data of earlier ionospheric missions be reprocessed with current algorithms to gain more profitable results? How could the scientific community be provided with a new insight on wave processes that take place in the ionosphere? The answer is a specific and unique data mining service accessing a collection of topical catalogs that characterize a huge number of recorded occurrences of Whistler-like Electromagnetic Wave Phenomena, Atmosphere Gravity Waves, and Traveling Ionosphere Disturbances. IWS online service (http://popdat.cbk.waw.pl) offers end users to query optional set of predefined wave phenomena, their detailed characteristics. These were collected by target specific event detection algorithms in selected satellite records during database buildup phase. Result of performed wave processing thus represents useful information on statistical or comparative investigations of wave types, listed in a detailed catalog of ionospheric wave phenomena. The IWS provides wave event characteristics, extracted by specific software systems from data records of the selected satellite missions. The end-user can access targets by making specific searches and use statistical modules within the service in their field of interest. Therefore the IWS opens a new way in ionosphere and Space Weather research. The scientific applications covered by IWS concern beyond Space Weather also other fields like earthquake precursors, ionosphere climatology, geomagnetic storms, troposphere-ionosphere energy transfer, and trans-ionosphere link perturbations. © 2014 C. Ferencz et al.

  • Publication . Article . 2018
    Open Access
    Authors: 
    Bodó, Csanád; Heltai, János Imre;
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access English
    Authors: 
    unknown;
    Publisher: International Council of Onomastic Sciences; Magyar Nyelvtudományi Társaság
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access
    Authors: 
    Sergio Branciamore; Enzo Gallori; Eörs Szathmáry; Tamás Czárán;
    Country: Hungary
    Project: EC | EFLUX (225167)

    For the RNA-world hypothesis to be ecologically feasible, selection mechanisms acting on replicator communities need to be invoked and the corresponding scenarios of molecular evolution specified. Complementing our previous models of chemical evolution on mineral surfaces, in which selection was the consequence of the limited mobility of macromolecules attached to the surface, here we offer an alternative realization of prebiotic group-level selection: the physical encapsulation of local replicator communities into the pores of the mineral substrate. Based on cellular automaton simulations we argue that the effect of group selection in a mineral honeycomb could have been efficient enough to keep prebiotic ribozymes of different specificities and replication rates coexistent, and their metabolic cooperation protected from extensive molecular parasitism. We suggest that mutants of the mild parasites persistent in the metabolic system can acquire useful functions such as replicase activity or the production of membrane components, thus opening the way for the evolution of the first autonomous protocells on Earth.

  • Open Access
    Authors: 
    Müller, Márta;
    Publisher: ELTE Germanistisches Institut
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Publication . Article . 1993
    Open Access Hungarian
    Authors: 
    Mohay, Tamás;
    Publisher: Széphalom Könyvműhely
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access
    Authors: 
    Kelényi, Borbála;
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Publication . Article . Preprint . 2014
    Open Access English
    Authors: 
    Bajnok, Zoltán; Drukker, Nadav; Hegedus, Árpád; Nepomechie, Rafael I.; Palla, László; Sieg, Christoph; Suzuki, Ryo; Sub String Theory Cosmology and ElemPart; Quantum Gravity, Strings and Elementary Particles;
    Publisher: Springer/SISSA
    Countries: Hungary, Italy, Netherlands
    Project: NWO | Gauge fields from quantum... (2300157393), EC | TESTINGGSD (327996), NSF | Theory of Elementary Part... (1212337)

    We analyze the spectrum of open strings stretched between a D-brane and an anti-D-brane in planar AdS/CFT using various tools. We focus on open strings ending on two giant gravitons with different orientation in $AdS_5 \times S^5$ and study the spectrum of string excitations using the following approaches: open spin-chain, boundary asymptotic Bethe ansatz and boundary thermodynamic Bethe ansatz (BTBA). We find agreement between a perturbative high order diagrammatic calculation in ${\cal N}=4$ SYM and the leading finite-size boundary Luscher correction. We study the ground state energy of the system at finite coupling by deriving and numerically solving a set of BTBA equations. While the numerics give reasonable results at small coupling, they break down at finite coupling when the total energy of the string gets close to zero, possibly indicating that the state turns tachyonic. The location of the breakdown is also predicted analytically. Comment: 40 pages, lots of figures, v2: typos corrected, accepted for publication in JHEP

  • Publication . Part of book or chapter of book . 2017
    Open Access
    Authors: 
    Harvalík, Milan;
    Publisher: Magyar Nyelvtudományi Társaság
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access
    Authors: 
    Alexandra Markó; Andrea Deme; Márton Bartók; Tekla Etelka Gráczi; Tamás Gábor Csapó;
    Country: Hungary
    Project: EC | COLLMOT (227878)

    We examined vowel-initial irregular phonation in real words as a function of vowel quality, backness and height, and speech rate in Hungarian. We analyzed two types of irregular phonation: glottalization and glottal stop. We found that open vowels elicited more irregular phonation than mid and close ones, but we found no effect of the backness. The frequency of irregular phonation was lower in fast than in slow speech. Inconsistently with the claims of earlier studies, the relative frequency of glottalization to glottal stops was not influenced by speech rate in general. However, while /i/ was produced with a relatively higher ratio of glottal stops in fast speech, the open vowels showed the widely documented tendency of being realized with relatively less glottal stops under the same conditions.

Advanced search in
Research products
arrow_drop_down
Searching FieldsTerms
Any field
arrow_drop_down
includes
arrow_drop_down
Include:
1,129 Research products, page 1 of 113
  • Open Access
    Authors: 
    Csaba Ferencz; G.V. Lizunov; François Crespon; Ivan Price; Ludmil Bankov; Dorota Przepiórka; Klaus Brieß; Denis Dudkin; Andrey Girenko; Valery Korepanov; +10 more
    Country: Hungary
    Project: EC | POPDAT (263240)

    In the frame of the FP7 POPDAT project the Ionosphere Waves Service (IWS) has been developed and opened for public access by ionosphere experts. IWS is forming a database, derived from archived ionospheric wave records to assist the ionosphere and Space Weather research, and to answer the following questions: How can the data of earlier ionospheric missions be reprocessed with current algorithms to gain more profitable results? How could the scientific community be provided with a new insight on wave processes that take place in the ionosphere? The answer is a specific and unique data mining service accessing a collection of topical catalogs that characterize a huge number of recorded occurrences of Whistler-like Electromagnetic Wave Phenomena, Atmosphere Gravity Waves, and Traveling Ionosphere Disturbances. IWS online service (http://popdat.cbk.waw.pl) offers end users to query optional set of predefined wave phenomena, their detailed characteristics. These were collected by target specific event detection algorithms in selected satellite records during database buildup phase. Result of performed wave processing thus represents useful information on statistical or comparative investigations of wave types, listed in a detailed catalog of ionospheric wave phenomena. The IWS provides wave event characteristics, extracted by specific software systems from data records of the selected satellite missions. The end-user can access targets by making specific searches and use statistical modules within the service in their field of interest. Therefore the IWS opens a new way in ionosphere and Space Weather research. The scientific applications covered by IWS concern beyond Space Weather also other fields like earthquake precursors, ionosphere climatology, geomagnetic storms, troposphere-ionosphere energy transfer, and trans-ionosphere link perturbations. © 2014 C. Ferencz et al.

  • Publication . Article . 2018
    Open Access
    Authors: 
    Bodó, Csanád; Heltai, János Imre;
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access English
    Authors: 
    unknown;
    Publisher: International Council of Onomastic Sciences; Magyar Nyelvtudományi Társaság
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access
    Authors: 
    Sergio Branciamore; Enzo Gallori; Eörs Szathmáry; Tamás Czárán;
    Country: Hungary
    Project: EC | EFLUX (225167)

    For the RNA-world hypothesis to be ecologically feasible, selection mechanisms acting on replicator communities need to be invoked and the corresponding scenarios of molecular evolution specified. Complementing our previous models of chemical evolution on mineral surfaces, in which selection was the consequence of the limited mobility of macromolecules attached to the surface, here we offer an alternative realization of prebiotic group-level selection: the physical encapsulation of local replicator communities into the pores of the mineral substrate. Based on cellular automaton simulations we argue that the effect of group selection in a mineral honeycomb could have been efficient enough to keep prebiotic ribozymes of different specificities and replication rates coexistent, and their metabolic cooperation protected from extensive molecular parasitism. We suggest that mutants of the mild parasites persistent in the metabolic system can acquire useful functions such as replicase activity or the production of membrane components, thus opening the way for the evolution of the first autonomous protocells on Earth.

  • Open Access
    Authors: 
    Müller, Márta;
    Publisher: ELTE Germanistisches Institut
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Publication . Article . 1993
    Open Access Hungarian
    Authors: 
    Mohay, Tamás;
    Publisher: Széphalom Könyvműhely
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access
    Authors: 
    Kelényi, Borbála;
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Publication . Article . Preprint . 2014
    Open Access English
    Authors: 
    Bajnok, Zoltán; Drukker, Nadav; Hegedus, Árpád; Nepomechie, Rafael I.; Palla, László; Sieg, Christoph; Suzuki, Ryo; Sub String Theory Cosmology and ElemPart; Quantum Gravity, Strings and Elementary Particles;
    Publisher: Springer/SISSA
    Countries: Hungary, Italy, Netherlands
    Project: NWO | Gauge fields from quantum... (2300157393), EC | TESTINGGSD (327996), NSF | Theory of Elementary Part... (1212337)

    We analyze the spectrum of open strings stretched between a D-brane and an anti-D-brane in planar AdS/CFT using various tools. We focus on open strings ending on two giant gravitons with different orientation in $AdS_5 \times S^5$ and study the spectrum of string excitations using the following approaches: open spin-chain, boundary asymptotic Bethe ansatz and boundary thermodynamic Bethe ansatz (BTBA). We find agreement between a perturbative high order diagrammatic calculation in ${\cal N}=4$ SYM and the leading finite-size boundary Luscher correction. We study the ground state energy of the system at finite coupling by deriving and numerically solving a set of BTBA equations. While the numerics give reasonable results at small coupling, they break down at finite coupling when the total energy of the string gets close to zero, possibly indicating that the state turns tachyonic. The location of the breakdown is also predicted analytically. Comment: 40 pages, lots of figures, v2: typos corrected, accepted for publication in JHEP

  • Publication . Part of book or chapter of book . 2017
    Open Access
    Authors: 
    Harvalík, Milan;
    Publisher: Magyar Nyelvtudományi Társaság
    Country: Hungary
    Project: EC | COLLMOT (227878)
  • Open Access
    Authors: 
    Alexandra Markó; Andrea Deme; Márton Bartók; Tekla Etelka Gráczi; Tamás Gábor Csapó;
    Country: Hungary
    Project: EC | COLLMOT (227878)

    We examined vowel-initial irregular phonation in real words as a function of vowel quality, backness and height, and speech rate in Hungarian. We analyzed two types of irregular phonation: glottalization and glottal stop. We found that open vowels elicited more irregular phonation than mid and close ones, but we found no effect of the backness. The frequency of irregular phonation was lower in fast than in slow speech. Inconsistently with the claims of earlier studies, the relative frequency of glottalization to glottal stops was not influenced by speech rate in general. However, while /i/ was produced with a relatively higher ratio of glottal stops in fast speech, the open vowels showed the widely documented tendency of being realized with relatively less glottal stops under the same conditions.

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