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587 Matching Results
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ENSO Simulation in Coupled Ocean-Atmosphere Models: Are the Current Models Better?
Maintaining a multi-model database over a generation or more of model development provides an important framework for assessing model improvement. Using control integrations, we compare the simulation of the El Nino/Southern Oscillation (ENSO), and its extratropical impact, in models developed for the 2007 Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report with models developed in the late 1990's (the so-called Coupled Model Intercomparison Project-2 [CMIP2] models). The IPCC models tend to be more realistic in representing the frequency with which ENSO occurs, and they are better at locating enhanced temperature variability over the eastern Pacific Ocean. When compared with reanalyses, the IPCC models have larger pattern correlations of tropical surface air temperature than do the CMIP2 models during the boreal winter peak phase of El Nino. However, for sea-level pressure and precipitation rate anomalies, a clear separation in performance between the two vintages of models is not as apparent. The strongest improvement occurs for the modeling groups whose CMIP2 model tended to have the lowest pattern correlations with observations. This has been checked by subsampling the multi-century IPCC simulations in a manner to be consistent with the single 80-year time segment available from CMIP2. Our results suggest that multi-century …
Date:
April 29, 2005
Creator:
AchutaRao, K. & Sperber, K. R.
Object Type:
Article
System:
The UNT Digital Library
Incident Energy Dependence of pt Correlations at RHIC
We present results for two-particle transverse momentum correlations, ({Delta}p{sub t,i}{Delta}p{sub t,j}), as a function of event centrality for Au+Au collisions at {radical}s{sub NN} = 20, 62, 130, and 200 GeV at the Relativistic Heavy Ion Collider. We observe correlations decreasing with centrality that are similar at all four incident energies. The correlations multiplied by the multiplicity density increase with incident energy and the centrality dependence may show evidence of processes such as thermalization, jet production, or the saturation of transverse flow. The square root of the correlations divided by the event-wise average transverse momentum per event shows little or no beam energy dependence and generally agrees with previous measurements at the Super Proton Synchrotron.
Date:
April 29, 2005
Creator:
Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D.; Arkhipkin, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 18, Ed. 1 Thursday, April 29, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
April 29, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Exact matched-beam envelopes for undepressed transport in a quadrupole lattice with unequal drift lengths and arbitrary field strength
In 1958, Courant and Snyder analyzed the problem of alternating-gradient beam transport and treated a model without focusing gaps or space charge. Recently we revisited their work and found the exactsolution for matched-beam envelopes in a linear quadrupole lattice [O.A. Anderson and L.L. LoDestro, Phys. Rev. ST Accel. Beams, 2009]. We extend that work here to include the effect of gaps. We derive the exact envelopes and show results for various field strengths, occupancies eta,and gap-length ratios. We find the peak envelope excursion. It has a broad minimum as a function of the phase advance sigma (typically around 34o) over which it varies less than +-1percent. The phase-advance numbers also change little over the full range of gap ratios. However, the required field strengths vary appreciably. In the second stable band, the higher field strength necessitated by the lower occupancy accentuates the remarkable compression effect predicted for the FD (gapless) model.
Date:
April 29, 2009
Creator:
Anderson, O. A. & LoDestro, L. L.
Object Type:
Report
System:
The UNT Digital Library
Analytic Solution of the Envelope Equations for an Undepressed Matched Beam in a FODO Quadrupole Channel
In 1958, Courant and Snyder analyzed the problem of alternating-gradient beam transport and treated a model without focusing gaps or space charge. Recently we revisited their work and found the exact solution for matchedbeam envelopes in a linear quadrupole lattice [O.A. Anderson and L.L. LoDestro, Phys. Rev. ST Accel. Beams, 2009]. We extend that work here to include the effect of asymmetric drift spaces. We derive the solution and show exact envelopes for the first two solution bands and the peak envelope excursions as a function of the phase advancesigma up to 360o. In the second stable band, decreased occupancy requires higher focus field-strength and accentuates the remarkable compression effect predicted for the FD (gapless) model.
Date:
April 29, 2009
Creator:
Anderson, Oscar & LoDestro, L. L.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 106, No. 25, Ed. 1 Thursday, April 29, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 29, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 25, Ed. 1 Friday, April 29, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 29, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Downtown Edmond
Photograph of a Downtown Edmond Urban Art display.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Downtown Edmond
Photograph of a Downtown Edmond Urban Art display.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Downtown Edmond
Photograph of a Downtown Edmond Urban Art display.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Downtown Edmond
Photograph of a Downtown Edmond Urban Art display.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Festival of the Arts
Photograph of a scene during the Festival of the Arts, at the Myriad Gardens.
Date:
April 29, 2002
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History