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Identified particle distributions in pp and Au+Au collisions atsqrt sNN=200 GeV
Transverse mass and rapidity distributions for charged pions, charged kaons, protons and antiprotons are reported for {radical}sNN = 200 GeV pp and Au+Au collisions at RHIC. The transverse mass distributions are rapidity independent within |y| < 0.5, consistent with a boost-invariant system in this rapidity interval. Spectral shapes and relative particle yields are similar in pp and peripheral Au+Au collisions and change smoothly to central Au+Au collisions. No centrality dependence was observed in the kaon and antiproton production rates relative to the pion production rate from medium-central to central collisions. Chemical and kinetic equilibrium model fits to our data reveal strong radial flow and relatively long duration from chemical to kinetic freeze-out in central Au+Au collisions. The chemical freeze-out temperature appears to be independent of initial conditions at RHIC energies.
Date:
October 6, 2003
Creator:
Adams, J.; Adler, C.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
A new security model for collaborative environments
Prevalent authentication and authorization models for distributed systems provide for the protection of computer systems and resources from unauthorized use. The rules and policies that drive the access decisions in such systems are typically configured up front and require trust establishment before the systems can be used. This approach does not work well for computer software that moderates human-to-human interaction. This work proposes a new model for trust establishment and management in computer systems supporting collaborative work. The model supports the dynamic addition of new users to a collaboration with very little initial trust placed into their identity and supports the incremental building of trust relationships through endorsements from established collaborators. It also recognizes the strength of a users authentication when making trust decisions. By mimicking the way humans build trust naturally the model can support a wide variety of usage scenarios. Its particular strength lies in the support for ad-hoc and dynamic collaborations and the ubiquitous access to a Computer Supported Collaboration Workspace (CSCW) system from locations with varying levels of trust and security.
Date:
June 6, 2003
Creator:
Agarwal, Deborah; Lorch, Markus; Thompson, Mary & Perry, Marcia
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 18, No. 44, Ed. 1 Thursday, November 6, 2003
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
November 6, 2003
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with J. C. Alston, December 6, 2003
The National Museum of the Pacific War presents an oral interview with J.C. Alston. Alston joined the Navy in August, 1941. He eventually reported aboard the USS California (BB-44) and served in the number 2 turret. Alston describes being present aboard the California when the Japanese attacked Pearl Harbor. Afterwards, Alston stayed with the California repairing and refurbishing her. Alston was aboard for the in Leyte invasion in the Philippines and describes watching some of the action at Iwo Jima. Alston also speaks about life aboard the California during the war.
Date:
December 6, 2003
Creator:
Alston, J. C.
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with J. C. Alston, December 6, 2003
The National Museum of the Pacific War presents an oral interview with J.C. Alston. Alston joined the Navy in August, 1941. He eventually reported aboard the USS California (BB-44) and served in the number 2 turret. Alston describes being present aboard the California when the Japanese attacked Pearl Harbor. Afterwards, Alston stayed with the California repairing and refurbishing her. Alston was aboard for the in Leyte invasion in the Philippines and describes watching some of the action at Iwo Jima. Alston also speaks about life aboard the California during the war.
Date:
December 6, 2003
Creator:
Alston, J. C.
Object Type:
Text
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 105, No. 122, Ed. 1 Wednesday, August 6, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 6, 2003
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 173, Ed. 1 Monday, October 6, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 6, 2003
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 200, Ed. 1 Thursday, November 6, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 6, 2003
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Centennial Land Run Statue
Photograph of a Centennial Land Run statue, along the Bricktown Canal.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Centennial Land Run Statue
Photograph of a Centennial Land Run statue, along the Bricktown Canal.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Centennial Land Run Statue
Photograph of a Centennial Land Run statue, along the Bricktown Canal.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Centennial Land Run Statue
Photograph of a Centennial Land Run statue, along the Bricktown Canal.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Myriad Gardens
Photograph of a scene at the Myriad Gardens.
Date:
October 6, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History