Degree Department

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X-ray absorption study of the electronic structure of Mn-doped amorphous Si (open access)

X-ray absorption study of the electronic structure of Mn-doped amorphous Si

The electronic structure of Mn in amorphous Si (a-Mn{sub x}Si{sub 1?x}) is studied by X-ray absorption spectroscopy at the Mn L{sub 3,2} edges for x = 0.005-0.18. Except the x = 0.005 sample, which shows a slight signature of Mn{sup 2+} atomic multiplets associated with a local Mn moment, all samples have broad and featureless L{sub 3,2} absorption peaks, corresponding to an itinerant state for all 3d electrons. The broad X-ray absorption spectra exclude the possibility of a localized 3d moment and explain the unexpectedly quenched Mn moment in this magnetically-doped amorphous semiconductor. Such a fully delocalized d state of Mn dopant in Si has not been previously suggested.
Date: March 8, 2008
Creator: Arenholz, Elke; Zeng, Li; Huegel, A.; Helgren, E.; Hellman, F.; Piamonteze, C. et al.
Object Type: Article
System: The UNT Digital Library
Development of a low-power, low-cost front end electronics module for large scale distributed neutrino detectors (open access)

Development of a low-power, low-cost front end electronics module for large scale distributed neutrino detectors

A number of concepts have been presented for distributed neutrino detectors formed of large numbers of autonomous detectors. Examples include the Antarctic Ross Ice Shelf Antenna Neutrino Array (ARIANNA) [Barwick 2006], as well as proposed radio extensions to the IceCube detector at South Pole Station such as AURA and IceRay. [Besson 2008]. We have focused on key enabling technical developments required by this class of experiments. The radio Cherenkov signal, generated by the Askaryan mechanism [Askaryan 1962, 1965], is impulsive and coherent up to above 1 GHz. In the frequency domain, the impulsive character of the emission results in simultaneous increase of the power detected in multiple frequency bands. This multiband triggering approach has proven fruitful, especially as anthropogenic interference often results from narrowband communications signals. A typical distributed experiment of this type consists of a station responsible for the readout of a cluster of antennas either near the surface of the ice or deployed in boreholes. Each antenna is instrumented with a broadband low-noise amplifier, followed by an array of filters to facilitate multi-band coincidence trigger schemes at the antenna level. The power in each band is detected at the output of each band filter, using either square-law diode …
Date: March 8, 2008
Creator: Beatty, James J. & Kass, Richard D.
Object Type: Report
System: The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 116, No. 48, Ed. 1 Saturday, March 8, 2008 (open access)

Perry Daily Journal (Perry, Okla.), Vol. 116, No. 48, Ed. 1 Saturday, March 8, 2008

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date: March 8, 2008
Creator: Brown, Gloria
Object Type: Newspaper
System: The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 88, No. 68, Ed. 1 Saturday, March 8, 2008 (open access)

The Baytown Sun (Baytown, Tex.), Vol. 88, No. 68, Ed. 1 Saturday, March 8, 2008

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date: March 8, 2008
Creator: Clements, Clifford E.
Object Type: Newspaper
System: The Portal to Texas History

Master's Recital: 2008-03-08 - Victoria Eastman, oboe

Access: Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Master of Music (MM) degree.
Date: March 8, 2008
Creator: Eastman, Victoria
Object Type: Sound
System: The UNT Digital Library

Master's Recital: 2008-03-08 - Kathryn Frady, soprano

Access: Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Master of Music (MM) degree.
Date: March 8, 2008
Creator: Frady, Kathryn
Object Type: Sound
System: The UNT Digital Library

Doctoral Recital: 2008-03-08 - Sarah Abigail Griffiths, soprano

Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date: March 8, 2008
Creator: Griffiths, Sarah Abigail
Object Type: Sound
System: The UNT Digital Library
The Bastrop Advertiser (Bastrop, Tex.), Vol. 155, No. 4, Ed. 1 Saturday, March 8, 2008 (open access)

The Bastrop Advertiser (Bastrop, Tex.), Vol. 155, No. 4, Ed. 1 Saturday, March 8, 2008

Semi-weekly newspaper from Bastrop, Texas that includes local, state and national news along with advertising.
Date: March 8, 2008
Creator: McAuley, Davis
Object Type: Newspaper
System: The Portal to Texas History

[3rd Annual APAEC attendees]

A photograph of people gathered in one of the ballrooms on the UNT campus for the 2008 APAEC. They are walking around and are wearing nametags on lanyards around their necks.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[3rd Annual APAEC guests]

A photograph of people gathered in one of the ballrooms on the UNT campus for the 2008 APAEC. They are walking around and are wearing nametags on lanyards around their necks.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

["Asian Texans" book booth]

A photograph of Irwin A. Tang standing at a booth set up for his books: "How I Became a Black Man and Other Metamorphoses" and "Asian Texans: Our Histories and Our Lives". There are several copies of the books on the table and a woman is standing across from him. The booth was part of the 2008 APAEC.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Band performing at 3rd Annual APAEC]

A photograph of a band performing on stage during the 2008 APAEC, which was hosted by the UNT Multicultural Center. They are all standing in different areas of the stage. There is a drummer, two guitarists, and a singer.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Guitarist performing at 3rd Annual APAEC]

A photograph of a guitarist performing on stage during the 2008 APAEC, which was hosted by the UNT Multicultural Center. He is playing with his band but they are not in the picture.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Panel at 3rd Annual APAEC]

A photograph of panelists and a moderator that are part of the 2008 APAEC. The speakers are seated at a table in front of a projection screen that has the conference's tagline and purpose on it.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Performance at 3rd Annual APAEC]

A photograph of a group of performers on stage during the 2008 APAEC, which was hosted by the UNT Multicultural Center. They are all wearing pink pants with yellow tops and are holding up one arm and putting the other behind their backs.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Performers on stage at 3rd Annual APAEC]

A photograph of three performers on stage during the 2008 APAEC, which was hosted by the UNT Multicultural Center. The two young women have on black bottoms and tank-tops with a white band around their waists. The young man is wearing black slacks and suspenders over a white dress shirt.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Pianist and singer at 3rd Annual APAEC]

A photograph of two people on stage during the 2008 APAEC, which was hosted by the UNT Multicultural Center. One is sitting down at a piano and the other is standing beside the instrument and singing. There is sheet music on the piano's display and the young woman is holding a microphone.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Student at 3rd Annual APAEC]

A photograph of a young man at the 2008 APAEC, which was hosted by the UNT Multicultural Center. He is standing in front of a UNT themed backdrop with the logo and tagline on it. He is wearing a blazer and slacks.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Student playing pool at 3rd Annual APAEC]

A photograph of a young man playing pool during the 2008 APAEC, which was hosted by the UNT Multicultural Center. He is leaning towards the pool table and balancing the pool stick on his hand. There are several billiards balls scattered on the table but he is aiming for the blue and white striped one.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Two people on stage at 3rd Annual APAEC]

A photograph of two people on stage during the 2008 APAEC, which was hosted by the UNT Multicultural Center. One is sitting on a stool and is holding a microphone up to his face and the other is standing behind him and holding a microphone and paper in his hands.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Young man at 3rd Annual APAEC]

A photograph of a young man at the 2008 APAEC, which was hosted by the UNT Multicultural Center. He is standing in front of a UNT themed backdrop with the logo and tagline on it. He is wearing a green polo over a long white-sleeved shirt.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Young man holding microphone at 3rd Annual APAEC]

A photograph of a young man speaking during the 2008 APAEC, which was hosted by the UNT Multicultural Center. He is standing behind a podium with the UNT logo and name on a sign on the front of it and is also holding a microphone. There are red, green, and blue lights shining on the white backdrop.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Young man on stage at 2008 APAEC]

A photograph of a young man standing on stage during the 3rd Annual APAEC. He is wearing casual clothing and is holding a piece of paper. There is also a water bottle on the ground in front of him.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library

[Young man playing pool at 3rd Annual APAEC]

A photograph of a young man playing pool during the 2008 APAEC, which was hosted by the UNT Multicultural Center. He is leaning over the pool table and balancing the pool stick on his hand. There are several billiards balls scattered on the table but he is aiming for the solid yellow one.
Date: March 8, 2008
Creator: University of North Texas. Multicultural Center.
Object Type: Photograph
System: The UNT Digital Library