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374 Matching Results
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New inflation vs. chaotic inflation, higher degree potentials and the reconstruction program in light of WMAP3
The cosmic microwave background power spectra are studied for different families of single field new and chaotic inflation models in the effective field theory approach to inflation. We implement a systematic expansion in 1/N(e), where N(e)~;;50 is the number of e-folds before the end of inflation. We study the dependence of the observables (n(s), r and dn(s)/dlnk) on the degree of the potential (2n) and confront them to the WMAP3 and large scale structure data: This shows in general that fourth degree potentials (n=2) provide the best fit to the data; the window of consistency with the WMAP3 and LSS data narrows for growing n. New inflation yields a good fit to the r and n(s) data in a wide range of field and parameter space. Small field inflation yields r<0.16 while large field inflation yields r>0.16 (for N(e)=50). All members of the new inflation family predict a small but negative running -4(n+1) x 10-4<=dn(s)/dlnk<=-2 x 10-4. (The values of r, n(s), dn(s)/dlnk for arbitrary N(e) follow by a simple rescaling from the N(e)=50 values.) A reconstruction program is carried out suggesting quite generally that for n(s) consistent with the WMAP3 and LSS data and r<0.1 the symmetry breaking scale …
Date:
February 12, 2007
Creator:
Ho, Chiu Man; Boyanovsky, D.; de Vega, H.J.; Ho, C.M. & Sanchez, N.G.
Object Type:
Article
System:
The UNT Digital Library
Circumnuclear Star Clusters in the Galaxy Merger NGC 6240, Observed with Keck Adaptive Optics and HST
We discuss images of the central {approx} 10 kpc (in projection) of the galaxy merger NGC 6240 at H and K{prime} bands, taken with the NIRC2 narrow camera on Keck II using natural guide star adaptive optics. We detect 28 star clusters in the NIRC2 images, of which only 7 can be seen in the similar-spatial-resolution, archival WFPC2 Planetary Camera data at either B or I bands. Combining the NIRC2 narrow camera pointings with wider NICMOS NIC2 images taken with the F110W, F160W, and F222M filters, we identify a total of 32 clusters that are detected in at least one of these 5 infrared ({lambda}{sub c} > 1 {micro}m) bandpasses. By comparing to instantaneous burst, stellar population synthesis models (Bruzual & Charlot 2003), we estimate that most of the clusters are consistent with being {approx} 15 Myr old and have photometric masses ranging from 7 x 10{sup 5} M{sub {circle_dot}} to 4 x 10{sup 7}M{sub {circle_dot}}. The total contribution to the star formation rate (SFR) from these clusters is approximately 10M{sub {circle_dot}} yr{sup -1}, or {approx} 10% of the total SFR in the nuclear region. We use these newly discovered clusters to estimate the extinction toward NGC 6240's double nuclei, …
Date:
February 12, 2007
Creator:
Pollack, L K; Max, C E & Schneider, G
Object Type:
Article
System:
The UNT Digital Library
Electronic structure of titania aerogels: Soft x-ray absorption study
None
Date:
February 12, 2004
Creator:
Kucheyev, S. O.; Van Buuren, T.; Baumann, T. F.; Satcher, J. H. Jr.; Willey, T. M.; Meulenberg, R. W. et al.
Object Type:
Article
System:
The UNT Digital Library
CO2 Sequestration and Recycle by Photosynthesis
Hydrocarbon oxygenate synthesis from photocatalytic reactions of CO{sub 2} and H{sub 2}O over various catalysts is a very attractive process. However, the formation rate of the hydrocarbons and oxygenates is significantly lower than conventional catalysis. One possible reason for the low rate of product formation is the presence of oxidation sites which reoxidize the products back to CO{sub 2} and H{sub 2}O. For further improvement of catalytic activity for the reduction process, it is essential to understand the oxidation reaction process. We have studied photocatalytic oxidation of methylene blue and found the oxidation rate is significantly higher than the reduction rate.
Date:
February 12, 2006
Creator:
Chuang, Steven S.C.
Object Type:
Report
System:
The UNT Digital Library
Conversion of Parameters Among Variants of Scatchard's Neutral-Electrolyte Model for Electrolyte Mixtures that Have Different Numbers of Mixing Terms
Various model equations are available for representing the excess Gibbs energy properties (osmotic and activity coefficients) of aqueous and other liquid mixed-electrolyte solutions. Scatchard's neutral-electrolyte model is among the simplest of these equations for ternary systems and contains terms that represent both symmetrical and asymmetric deviations from ideal mixing behavior when two single-electrolyte solutions are mixed in different proportions at constant ionic strengths. The usual form of this model allows from zero to six mixing parameters. In this report we present an analytical method for transforming the mixing parameters of neutral-electrolyte-type models with larger numbers of mixing parameters directly to those of models with fewer mixing parameters, without recourse to the source data used for evaluation of the original model parameters. The equations for this parameter conversion are based on an extension to ternary systems of the methodology of Rard and Wijesinghe [J. Chem. Thermodyn. 35, 439-473 (2003)] and Wijesinghe and Rard [J. Chem. Thermodyn. 37, 1196-1218 (2005)] that was applied by them to binary systems. It was found that the use of this approach with a constant ionic-strength cutoff of I {le} 6.2 mol {center_dot} kg{sup -1} (the NaCl solubility limit) yielded parameters for the NaCl + SrCl{sub 2} …
Date:
February 12, 2008
Creator:
Rard, J. A. & Wijesinghe, A. M.
Object Type:
Article
System:
The UNT Digital Library
Measurements of time-dependent CP asymmetries in B0 --> D(*)+D(*)- decays
We present new measurements of time-dependent CP asymmetries for B{sup 0} {yields} D{sup (*)+}d{sup (*)-} decays using (467 {+-} 5) x 10{sup 6} B{bar B} pairs collected with the BABAR detector located at the PEP-II B Factory at the Stanford Linear Accelerator Center. We determine the CP-odd fraction of the B{sup 0} {yields} D*{sup +}D*{sup -} decays to be R{perpendicular} = 0.158 {+-} 0.028 {+-} 0.006 and find CP asymmetry parameters for the CP-even component of the decay S{sub +} = -0.76 {+-} 0.16 {+-} 0.04 and C{sub +} = 0.00 {+-} 0.12 {+-} 0.02. We measure S = -0.63{+-}0.36{+-}0.05 and C = -0.07{+-}0.23{+-}0.03 for B{sup 0} {yields} D{sup +}D{sup -}, S = -0.62{+-}0.21{+-}0.03 and C = 0.08 {+-} 0.17 {+-} 0.04 for B{sup 0} {yields} D*{sup +}D{sup -}, and S = -0.73 {+-} 0.23 {+-} 0.05 and C = 0.00 {+-} 0.17 {+-} 0.03 for B{sup 0} {yields} D{sup +}D*{sup -}. For the B{sup 0} {yields} D*{sup {+-}}D{sup {-+}} decays, we also determine the CP-violating asymmetry A = 0.008 {+-} 0.048 {+-} 0.013. In each case, the first uncertainty is statistical and the second is systematic. The measured values for the asymmetries are all consistent with the Standard Model.
Date:
February 12, 2009
Creator:
Aubert, B.; Bona, M.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Prencipe, E. et al.
Object Type:
Article
System:
The UNT Digital Library
High Exposure Facility Technical Description
The High Exposure Facility is a collimated high-level gamma irradiator that is located in the basement of the 318 building. It was custom developed by PNNL back in 1982 to meet the needs for high range radiological instrument calibrations and dosimeter irradiations. At the time no commercially available product existed that could create exposure rates up to 20,000 R/h. This document is intended to pass on the design criteria that was employed to create this unique facility, while maintaining compliance with ANSI N543-1974, "General Safety Standard for Installations Using Non-Medical X-Ray and Sealed Gamma-Ray Sources, Energies up to 10 MeV."
Date:
February 12, 2008
Creator:
Carter, Gregory L.; Stithem, Arthur R.; Murphy, Mark K. & Smith, Alex K.
Object Type:
Report
System:
The UNT Digital Library
Ternary Isothermal Diffusion Coefficients of NaCl-MgCl2-H2O at 25 C. 7. Seawater Composition
The four diffusion coefficients D{sub ij} of the ternary system NaCl-MgCl{sub 2}-H{sub 2}O at the simplified seawater composition 0.48877 mol {center_dot} dm{sup -3} NaCl and 0.05110 mol {center_dot} dm{sup -3} MgCl{sub 2} have been remeasured at 25 C. The diffusion coefficients were obtained using both Gouy and Rayleigh interferometry with the highly precise Gosting diffusiometer. The results, which should be identical in principle, are essentially the same within or very close to their combined 'realistic' errors. This system has a cross-term D{sub 12} that is larger than the D{sub 22} main-term, where subscript 1 denotes NaCl and 2 denotes MgCl{sub 2}. The results are compared with earlier, less-precise measurements. Recommended values for this system are (D{sub 11}){sub V} = 1.432 x 10{sup -9} m{sup 2} {center_dot} sec{sup -1}, (D{sub 12}){sub V} = 0.750 x 10{sup -9} m{sup 2} {center_dot} sec{sup -1}, (D{sub 21}){sub V} = 0.0185 x 10{sup -9} m{sup 2} {center_dot} sec{sup -1}, and (D{sub 22}){sub V} = 0.728 x 10{sup -9} m{sup 2} {center_dot} sec{sup -1}.
Date:
February 12, 2007
Creator:
Miller, D. G.; Lee, C. M. & Rard, J. A.
Object Type:
Article
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 39, No. 13, Ed. 1 Tuesday, February 12, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 12, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 20, Ed. 1 Thursday, February 12, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
February 12, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 14, Ed. 1 Tuesday, February 12, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
February 12, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 39, No. 7, Ed. 1 Thursday, February 12, 2009
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
February 12, 2009
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 21, Ed. 1 Thursday, February 12, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
February 12, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
University Press (Beaumont, Tex.), Vol. 79, No. 28, Ed. 1 Wednesday, February 12, 2003
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
February 12, 2003
Creator:
Kutac, Dennis
Object Type:
Newspaper
System:
The Portal to Texas History
[Letter from Thomas A. Baker to Eleanor Brown, February 12, 2003]
Letter from Lieutenant General Thomas A. Baker to Eleanor Brown, inviting her to apply for membership in the Order of Daedalians, a fraternal order of military pilots.
Date:
February 12, 2003
Creator:
Baker, Thomas A.
Object Type:
Letter
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 153, No. 51, Ed. 1 Wednesday, February 12, 2003
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
February 12, 2003
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 88, No. 74, Ed. 1 Thursday, February 12, 2004
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
February 12, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 91, No. 17, Ed. 1 Tuesday, February 12, 2008
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
February 12, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 93, No. 14, Ed. 1 Thursday, February 12, 2009
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
February 12, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Jewish Post (Fort Worth, Tex.), Vol. 63, No. 7, Ed. 1 Thursday, February 12, 2009
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state and national news along with extensive advertising.
Date:
February 12, 2009
Creator:
Wisch, Rene
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 38, No. 15, Ed. 1 Tuesday, February 12, 2008
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
February 12, 2008
Creator:
Crotty, Sarah
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 32, No. 14, Ed. 1 Wednesday, February 12, 2003
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
February 12, 2003
Creator:
Hendrickson, Janet & Kuckelman, Meghan
Object Type:
Newspaper
System:
The Portal to Texas History
[Group Photograph with Museum's New Sign]
Photograph of a group near new museum signs for the Mexic-Arte Museum in Austin, Texas. The identical signs, which appear at the corner of a building, are tinted black and beige in color. Those in the group include Kirk Watson, Nilda de la Llata, and Sylvia Orozco. Photograph was taken during a photo shoot with city council celebrating the ownership of the building.
Date:
February 12, 2001
Creator:
Mexic-Arte Museum (Austin, Tex.)
Object Type:
Photograph
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 89, No. 3, Ed. 1 Wednesday, February 12, 2003
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
February 12, 2003
Creator:
Nettles, Marc
Object Type:
Newspaper
System:
The Portal to Texas History