scholarly journals Massive Compact Disks around FU Orionis–type Young Eruptive Stars Revealed by ALMA

2021 ◽  
Vol 256 (2) ◽  
pp. 30
Author(s):  
Á. Kóspál ◽  
F. Cruz-Sáenz de Miera ◽  
J. A. White ◽  
P. Ábrahám ◽  
L. Chen ◽  
...  
Keyword(s):  
Compact Disks

scholarly journals Observing compact disks inside pre-PNe with the VLTI

2011 ◽  
Vol 7 (S283) ◽  
pp. 115-118
Author(s):  
Stacey N. Bright ◽  
Orsola De Marco ◽  
Olivier Chesneau ◽  
Eric Lagadec ◽  
Hans Van Winckel ◽  
...  
Keyword(s):  
Mass Loss ◽  
Agb Stars ◽  
Reflected Light ◽  
Shaping Process ◽  
Show Evidence ◽  
Compact Disks

AbstractAGB stars appear to lose mass spherically, but many PNe resulting from the AGB mass-loss have non-spherical morphologies. Compact disks have been found in some bipolar PNe, but their role in the shaping process remains unknown. Compact Keplerian disks are found to be common around post-AGB binaries, however, these objects may never develop into PNe. Another group of post-AGB stars, known as pre-PNe, are surrounded by collimated nebulae shining by reflected light or shock ionisation. We are observing the inner circumstellar regions of pre-PNe at high angular resolutions with the VLTI. We seek to compare pre-PNe disks to those around other post-AGB stars and PNe. New observations of the pre-PN, IRAS 16279-4757, show evidence for a disk similar to those seen in young PNe.

Technology Enhanced Language Learning in Virtual Worlds

2012 ◽  
pp. 293-309
Author(s):  
Tosti H.C. Chiang ◽  
Tom T.C. Tsai ◽  
Irene Y.S. Li ◽  
Indy Y.T. Hsiao ◽  
Stephen J.H. Yang
Keyword(s):  
Information Technology ◽  
Language Learning ◽  
Virtual Worlds ◽  
Training And Development ◽  
Digital Learning ◽  
Virtual Classrooms ◽  
Global Networks ◽  
Internet Learning ◽  
American Society ◽  
Compact Disks

The application of Information Technology makes distance learning possible. Teachers can teach students who live in another side of the globe via Internet. They can see each others’ images and hear each others’ voices, which could not be done twenty years ago, through Internet. With the development of Internet, students can learn without the limitations of time and space. American Society for Training and Development proposed that digital learning includes learning through Internet, learning by computers, learning in virtual classrooms, and digital cooperation. The digitalized course contents can be transmitted via Internet, local or global networks, audio books, videotapes, satellite, interactive televisions, and compact disks.

Influence of compact disk recording protocols on reliability and comparability of speech audiometry outcomes: acoustic analysis

2010 ◽  
Vol 124 (8) ◽  
pp. 859-863 ◽  
Author(s):  
F Di Berardino ◽  
G Tognola ◽  
A Paglialonga ◽  
D Alpini ◽  
F Grandori ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Acoustic Analysis ◽  
Speech Audiometry ◽  
Test Material ◽  
Compact Disk ◽  
Calibration Signal ◽  
Speech Test ◽  
Compact Disks ◽  
The Impact ◽  
Test Outcomes

AbstractObjective:To assess whether different compact disk recording protocols, used to prepare speech test material, affect the reliability and comparability of speech audiometry testing.Material and methods:We conducted acoustic analysis of compact disks used in clinical practice, to determine whether speech material had been recorded using similar procedures. To assess the impact of different recording procedures on speech test outcomes, normal hearing subjects were tested using differently prepared compact disks, and their psychometric curves compared.Results:Acoustic analysis revealed that speech material had been recorded using different protocols. The major difference was the gain between the levels at which the speech material and the calibration signal had been recorded. Although correct calibration of the audiometer was performed for each compact disk before testing, speech recognition thresholds and maximum intelligibility thresholds differed significantly between compact disks (p < 0.05), and were influenced by the gain between the recording level of the speech material and the calibration signal.Conclusion:To ensure the reliability and comparability of speech test outcomes obtained using different compact disks, it is recommended to check for possible differences in the recording gains used to prepare the compact disks, and then to compensate for any differences before testing.

scholarly journals Approximation by generalized complex Szász–Mirakyan operators in compact disks

2019 ◽  
Vol 43 (5) ◽  
pp. 2193-2202
Author(s):  
Döne KARAHAN ◽  
Sevilay K. SERENBAY ◽  
Aydın IZGİ
Keyword(s):  
Generalized Complex ◽  
Compact Disks

scholarly journals Infall in Protostellar Envelopes

2004 ◽  
Vol 221 ◽  
pp. 75-82
Author(s):  
Nagayoshi Ohashi
Keyword(s):  
Observational Studies ◽  
Recent Progress ◽  
Angular Resolution ◽  
Protoplanetary Disks ◽  
Great Emphasis ◽  
High Angular Resolution ◽  
Compact Disks

We summarize recent progress of observational studies of infall in protostellar envelopes, with great emphasis on results obtained using millimeter and submillimeter interferometers. Interferometric observations allow us to spatially resolve kinematical structures of protostellar envelopes, enabling us to detect infalling motions in the envelope directly. High angular resolution observations of infalling envelopes having compact disks sufficiently bright in continuum show inverse P-Cygni profiles, which are the least ambiguous evidence for infall. Observations of infalling envelopes using the Submillimeter Array (SMA) may allow us to study the innermost infalling envelopes, where infalling motions most probably transform to Keplerian motions, leading to formation of Keplerian or protoplanetary disks around protostars.

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