164 research outputs found

    „ÉNEK ÔRZI AZ IDÔT” Újra a BartĂłk-egynemĂ»karok szövegforrĂĄsainak nyomĂĄban

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    The Herschel/PACS view of disks around low-mass stars in Chamaleon-I

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    Circumstellar disks are expected to be the birthplaces of planets. The potential for forming one or more planets of various masses is essentially driven by the initial mass of the disks. We present and analyze Herschel/PACS observations of disk-bearing M-type stars that belong to the young ~2 Myr old Chamaleon-I star forming region. We used the radiative transfer code RADMC to successfully model the SED of 17 M-type stars detected at PACS wavelengths. We first discuss the relatively low detection rates of M5 and later spectral type stars with respect to the PACS sensitivity, and argue their disks masses, or flaring indices, are likely to be low. For M0 to M3 stars, we find a relatively broad range of disk masses, scale heights, and flaring indices. Via a parametrization of dust stratification, we can reproduce the peak fluxes of the 10 Ό\mum emission feature observed with Spitzer/IRS, and find that disks around M-type stars may display signs of dust sedimentation. The Herschel/PACS observations of low-mass stars in Cha-I provide new constraints on their disk properties, overall suggesting that disk parameters for early M-type stars are comparable to those for more massive stars (e.g., comparable scale height and flaring angles). However, regions of the disks emitting at about 100 Ό\mum may still be in the optically thick regime, preventing direct determination of disk masses. Thus the modeled disk masses should be considered as lower limits. Still, we are able to extend the wavelength coverage of SED models and start characterizing effects such as dust sedimentation, an effort leading the way towards ALMA observations of these low-mass stars

    Equipartitioning by a convex 3-fan

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    We show that for a given planar convex set K of positive area there exist three pairwise internally disjoint convex sets whose union is K such that they have equal area and equal perimeter

    ZeneoktatĂĄs online? - LehetƑsĂ©gek Ă©s korlĂĄtok

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    Zenekritika az 1950-es Ă©vekben a Magyar Állami OperahĂĄz SajtĂłarchĂ­vumĂĄnak tĂŒkrĂ©ben.

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    Az 1950-es Ă©vek magyar zenekultĂșrĂĄjĂĄval foglalkozĂł szakirodalomban idƑrƑl-idƑre visszatĂ©rƑ motĂ­vum a kritikaĂ­rĂĄs problĂ©mĂĄssĂĄ vĂĄlĂĄsĂĄnak emlĂ­tĂ©se. BĂĄr ezek a beszĂĄmolĂłk sok tekintetben egybevĂĄgnak, helyenkĂ©nt mĂ©gis talĂĄlhatĂłak ellentmondĂĄsok közöttĂŒk. A kritika felĂŒlrƑl szĂĄndĂ©kolt elhallgattatĂĄsĂĄrĂłl, a zeneĂ©let szereplƑi rĂ©szĂ©rƑl "minƑsĂ©gi közöny"-rƑl, az "önreflexiĂłrĂłl" valĂł lemondĂĄsrĂłl Ă©pp Ășgy olvashatunk, mint a kritikĂĄrĂłl szĂłlĂł Ă©lĂ©nk vitĂĄkrĂłl, Ă©s annak felĂ©lesztĂ©sĂ©t követelƑ felszĂłlalĂĄsokrĂłl. Ezen ellentmondĂĄsok feloldĂĄsĂĄnak kĂ­sĂ©rlete a tanulmĂĄny tĂĄrgya, az ötvenes Ă©vek zenekritikai helyzetĂ©nek bƑvebb vizsgĂĄlatĂĄval. Ehhez a munkĂĄhoz alapul a szakirodalmon kĂ­vĂŒl az OperahĂĄz archĂ­vumĂĄnak a korszakot illetƑ sajtĂłkritika-könyvei szolgĂĄlnak. A tĂ©ma terjedelmĂ©re tekintettel tĂ­z Ă©v a vizsgĂĄlĂłdĂĄs tĂĄrgya 1948-tĂłl 1957-ig. SzintĂ©n a tĂ©ma nagysĂĄga Ă©s az összehasonlĂ­thatĂłsĂĄg cĂ©lja az oka, hogy a tanulmĂĄny a kritikatĂĄr vizsgĂĄlatakor minden esztendƑ 10. hĂłnapjĂĄt veszi alapul, bemutatva Ă©s elemezve az intĂ©zmĂ©nyrƑl Ă©s annak elƑadĂĄsairĂłl megjelent cikkek Ă©s kritikĂĄk szĂĄmbeli Ă©s tartalmi vĂĄltozĂĄsait. VĂ©gezetĂŒl az Ă­gy nyert adatokat a törtĂ©nelmi esemĂ©nyekkel, a korszak zeneĂ©letĂ©nek ismert vonatkozĂł dokumentumaival Ă©s a szakirodalmi adatokkal pĂĄrhuzamba ĂĄllĂ­tva keresi a vĂĄlaszokat a vĂĄltozĂĄsok valĂłdi okaira, Ă©s a zenekritika valĂłs helyzetĂ©re az 1950-es Ă©vekben

    RĂ©gi Ă©s Ășj GyergyĂłalfalu kĂĄntorkönyveiben = Old and New in the Cantor Books of GyergyĂłalfalu

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    Old and New in the Cantor Books of Gyergyóalfalu The present study analyses two manuscript cantor (chorister) books of Gyergyóalfalu. In order to place them correctly in context, reviewing the former ecclesiastical publications of the region and synopsis of the results of former researches is inevitable. Although a printed choir book appeared a just few years before, cantor books in manuscript react more promptly to the changes of the village’s repertoire: they comprise the new melodies and indicate fresh orientations. Their significance, imperative for the research of popular music and folk music is enhanced by their ability to testify of the para liturgical tradition which often remains outside the official versions
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