Physical Processes in Star Formation

© 2020 Springer-Verlag. The final publication is available at Springer via https://doi.org/10.1007/s11214-020-00693-8.Star formation is a complex multi-scale phenomenon that is of significant importance for astrophysics in general. Stars and star formation are key pillars in observational astronomy from local star forming regions in the Milky Way up to high-redshift galaxies. From a theoretical perspective, star formation and feedback processes (radiation, winds, and supernovae) play a pivotal role in advancing our understanding of the physical processes at work, both individually and of their interactions. In this review we will give an overview of the main processes that are important for the understanding of star formation. We start with an observationally motivated view on star formation from a global perspective and outline the general paradigm of the life-cycle of molecular clouds, in which star formation is the key process to close the cycle. After that we focus on the thermal and chemical aspects in star forming regions, discuss turbulence and magnetic fields as well as gravitational forces. Finally, we review the most important stellar feedback mechanisms.Peer reviewedFinal Accepted Versio

Correlation between development and innovations of spa in Hajdúszoboszló and the growth of capacity in hotels

Szakdolgozatomban arra keresem elsősorban a választ, hogy a hajdúszoboszlói fürdőfejlesztések és a szálláshely-kapacitás alakulása között milyen kapcsolat figyelhető meg. Kutatásomat mélyinterjúk alapján készítettem. Az interjúalanyok egyrészt a szálláshely-szolgáltatókat képviselik, másrészt pedig a fürdő-,a város-,és a helyi turizmusvezetés egy-egy szereplője. Párhuzamokat vonok az egyes fürdőt érintő beruházások, valamint az új szállodák, és az egyes kapacitás-bővítések mozgatórugói között. A szálláshelyek tekintetében túlkínálat van a városban, így néhány minőségjavítást célzó törekvést sorolok fel.BSc/BATurizmus-vendéglátásK

Development of turbulence-measuring equipment /

Hot-wire turbulence-measuring equipment has been developed to meet the more-stringent requirements involved in the measurement of fluctuations in flow parameters at supersonic velocities. The higher mean speed necessitates the resolution of higher frequency components than at low speed, and the relatively low turbulence level present at supersonic speed makes necessary an improved noise level for the equipment. The equipment covers the frequency range from 2 to 70,000 cycles per second. The equipment is adaptable to all-purpose turbulence work with improved utility and accuracy over that of older types of equipment. Sample measurements are given to demonstrate the performance.NACA TN No. 2839."January 1953."Includes bibliographical references.Hot-wire turbulence-measuring equipment has been developed to meet the more-stringent requirements involved in the measurement of fluctuations in flow parameters at supersonic velocities. The higher mean speed necessitates the resolution of higher frequency components than at low speed, and the relatively low turbulence level present at supersonic speed makes necessary an improved noise level for the equipment. The equipment covers the frequency range from 2 to 70,000 cycles per second. The equipment is adaptable to all-purpose turbulence work with improved utility and accuracy over that of older types of equipment. Sample measurements are given to demonstrate the performance.Mode of access: Internet