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A 14.6 Arcsecond Quasar Lens Split by a Massive Dark Matter Halo
Gravitational lensing is a powerful tool to study the distribution of dark matter in the universe. The cold dark matter model of structure formation predicts the existence of quasars gravitationally lensed by concentrations of dark matter so massive that the quasar images would be split by over 7 inches. However, numerous searches for large-separation lensed quasars have been unsuccessful; all of the roughly 70 lensed quasars known to date, such as Q0957+561, have smaller splittings, and can be explained in terms of galaxy scale concentrations of baryonic matter that have undergone dissipative collapse. Here they report the discovery of the first large-separation lensed quasar, SDSS J1004+4112, with a maximum separation of 14.62 inches; at this separation, the lensing object must be dominated by dark matter. While gravitationally lensed galaxies of even large separation are known, large-separation quasars are more useful cosmological probes because of the simplicity of the resulting lens systems. The discovery in their current quasar sample is fully consistent with the theoretical expectations based on the cold dark matter model.
Date:
December 4, 2003
Creator:
Inada, N.; Oguri, M.; Pindor, B.; Hennawi, J.; Chiu, K.; Zheng, W. et al.
Object Type:
Article
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 128, No. 27, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
December 4, 2003
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 105, No. 224, Ed. 1 Thursday, December 4, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Archer County News (Archer City, Tex.), No. 49, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 367, Ed. 1 Thursday, December 4, 2003
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 113, No. 49, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
December 4, 2003
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Comanche Chief (Comanche, Tex.), No. 31, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
Cooper Review (Cooper, Tex.), Vol. 123, No. 49, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Pinson, Beth
Object Type:
Newspaper
System:
The Portal to Texas History
Coup in Georgia [Republic]: Recent Developments and Implications
This report examines the ouster of Georgia's President Eduard Shevardnadze in the wake of a legislative election that may Georgians viewed as not free and fair.
Date:
December 4, 2003
Creator:
Nichol, Jim
Object Type:
Report
System:
The UNT Digital Library
Development of a Novel Non-Consumable Anode for Electrowinning Primary Aluminum
The principal goal of the project was to determine through theoretical considerations and from chemical and electrochemical laboratory studies the technical and economic feasibility for the substitution and retrofitting of an SOFC-type anode for today's carbon anode in a cell for electrowinning primary Al. However, solubility measurements showed that no value of cryolite ratio can exist where the solubilities of the solid electrolyte components (zirconia and especially yttria) would be small relative to the alumina solubility. Therefore, the utilization of the proposed SOFC-type anode cannot be realized for any cell involving a cryolite-base solvent. However, the project suggested that the SOFC-type anode scheme might be successful if the solvent/electrolyte for electrowinning Al could be changed to a fused sulfate melt. During the solubility experiments, electrochemical probes were developed, and a bath characterization was defined, to measure quantitatively the acid-base character of cryolite melts. The measured acid-base behavior was then used to correlate the alumina solubility in cryolite over a wide range of cryolite ratio at 1300K. A mathematical modeling of the alumina solubility as a function of basicity identified three solutes of Al{sub 2}O{sub 3} in cryolite-base melts: Na{sub 2}Al{sub 2}OF{sub 6}, Na{sub 2}Al{sub 2}O{sub 2}F{sub 4}, and Na{sub 4}Al{sub …
Date:
December 4, 2003
Creator:
Rapp, Robert A. & Zhang, Y.
Object Type:
Report
System:
The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 14, No. 14, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Effects of the Use of Pore Formers on Performance of an Anode supported Solid Oxide Fuel Cell
The effects of amount of pore former used to produce porosity in the anode of an anode supported planar solid oxide fuel cell were examined. The pore forming material utilized was rice starch. The reduction rate of the anode material was measured by Thermogravimetric Analysis (TGA) to qualitatively characterize the gas transport within the porous anode materials. Fuel cells with varying amounts of porosity produced by using rice starch as a pore former were tested. The performance of the fuel cell was the greatest with an optimum amount of pore former used to create porosity in the anode. This optimum is believed to be related to a trade off between increasing gas diffusion to the active three-phase boundary region of the anode and the loss of performance due to the replacement of active three-phase boundary regions of the anode with porosity.
Date:
December 4, 2003
Creator:
Haslam, J. J.; Pham, A.; Chung, B. W.; DiCarlo, J. F. & Glass, R. S.
Object Type:
Article
System:
The UNT Digital Library
Electra Star-News (Electra, Tex.), Vol. 98, No. 15, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Evaporative Concentration of 100x J13 Ground Water at 60% Relative Humidity and 90C
In these experiments we studied the behavior of a synthetic concentrated J13 solution as it comes in contact with a Ni-Cr-Mo-alloy selected for waste canisters in the designated high-level nuclear-waste repository at Yucca Mountain, Nevada. Concentrated synthetic J13 solution was allowed to drip slowly onto heated test specimens (90 C, 60% relative humidity) where the water moved down the surface of the specimens, evaporated and minerals precipitated. Mineral separation or zoning along the evaporation path was not observed. We infer from solid analyses and geochemical modeling, that the most corrosive components (Ca, Mg, and F) are limited by mineral precipitation. Minerals identified by x-ray diffraction include thermonatrite, natrite, and trona, all sodium carbonate minerals, as well as kogarkoite (Na{sub 3}SO{sub 4}F), halite (NaCl), and niter (KNO{sub 3}). Calcite and a magnesium silicate precipitation are based on chemical analyses of the solids and geochemical modeling. The most significant finding of this study is that sulfate and fluoride concentrations are controlled by the solubility of kogarkoite. Kogarkoite thermodynamic data are needed in the Yucca Mountain Project database to predict the corrosiveness of carbonate brines and to establish the extent to which fluoride is removed from the brines as a solid.
Date:
December 4, 2003
Creator:
Staggs, K; Maureen Alai,; Hailey, P; Carroll, S A; Sutton, M & Nguyen, Q A
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Thursday, December 4, 2003
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Field Analysis of Propellant Stabilizers and their Daughter Products in any Propellant Formulation by Thin-Layer Chromatography Year End Report 2003
Lawrence Livermore National Laboratory's Forensic Science Center (FSC) has successfully resolved a variety of concerns related to propellant stabilizer analysis by thin-layer chromatography. The technology is now ready to proceed to validation and the related issues associated with deployment, both CONUS and OCONUS. The goal of this project is to develop a completely self-contained field-portable system to quantitatively analyze propellants for their stabilizer content. Lawrence Livermore National Laboratory's Forensic Science Center (FSC) has taken an established technology, thin-layer chromatography (TLC), and developed new sampling protocols, unique hardware, and specialized chemistries for incorporation into a new field-portable TLC kit. Some of the advantages of this system are the ability to analyze several samples or lots simultaneously, very low detection limits, and field reliability when deployed, it will become an efficient, cost-effective method for the determination of the remaining effective stabilizer (%RES) in propellants. Due to its portability, ease of use, and low cost, this technology will be useful in a variety of CONUS and OCONUS analysis scenarios. The TLC technology development is sponsored by the US Army, Defense Ammunition Center (DAC). Patents on this technology have been awarded and the kit is now commercially available.
Date:
December 4, 2003
Creator:
Whipple, R
Object Type:
Report
System:
The UNT Digital Library
First results on neutrinoless double beta decay of Te-130 with the calorimetric cuoricino experiment
The first results are reported on the limit for neutrinoless double decay of {sup 130}Te obtained with the new bolometric experiment CUORICINO. The set-up consists of 44 cubic crystals of natural TeO{sub 2}, 5 cm on the side and 18 crystals of 3 x 3 x 6 cm{sup 3}. Four of these latter crystals are made with isotopically enriched materials: two in {sup 128}Te and two others in {sup 130}Te . With a sensitive mass of {approx}40 kg, our array is by far the most massive running cryogenic detector to search for rare events. The array is operated at a temperature of {approx}10 mK in a dilution refrigerator under a heavy shield in the Gran Sasso Underground Laboratory at a depth of about 3500 m.w.e. The counting rate in the region of neutrinoless double beta decay is {approx}0.2 counts keV{sup -1} kg{sup -1} year{sup -1}, among the lowest in this type of experiment. No evidence for neutrinoless double beta decay is found with the present statistics obtained in about three months with a live time of 72%. The corresponding lower limit for the lifetime of this process is of 5.5 x 10{sup 23} years at 90% C.L. The corresponding limit …
Date:
December 4, 2003
Creator:
Arnaboldi, C.; Artusa, D. R.; Avignone, F. T.; Balata, M.; Bandac, I.; Barucci, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Garber Billings News (Garber, Okla.), Vol. 104, No. 7, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Garber, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Hogan, Vickie Lee
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Head Start: Better Data and Processes Needed to Monitor Underenrollment
A letter report issued by the General Accounting Office with an abstract that begins "Head Start, created in 1965, is designed to prepare low-income preschool children for school by providing a comprehensive set of early child development services primarily through communitybased organizations. Over the last decade there have been a number of changes in Head Start's operating environment, including a decrease in the number of poor children; an increase in the number, size, and scope of other federal and state early childhood programs; and an expansion in Head Start spending and enrollment. Given this environment, GAO was asked to determine (1) what is known about the extent to which Head Start programs are underenrolled, (2) ACF regional officials' and Head Start grantees' views on what factors contribute to underenrollment, and (3) what actions ACF and grantees have taken to address underenrollment."
Date:
December 4, 2003
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Hondo Anvil Herald (Hondo, Tex.), Vol. 117, No. 49, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 4, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The House's Corrections Calendar
This report discusses the establishment of the "Corrections Day," a concept credited to Michigan Governor John Englerwhich, which is a procedure for repealing "the dumbest things the federal government is currently doing."
Date:
December 4, 2003
Creator:
Oleszek, Walter J.
Object Type:
Report
System:
The UNT Digital Library
Interferometric Studies of Laser-Created Plasmas Using Compact Soft X-Ray Lasers
We summarize results of several successful dense plasma diagnostics experiments realized by combining two different kinds of table-top soft x-ray lasers with an amplitude division interferometer based on diffraction grating beam splitters. In the first set of experiments this robust high throughput diffraction grating interferometer (DGI) was used with a 46.9 nm portable capillary discharge laser to study the dynamics of line focus and point focus laser-created plasmas. The measured electron density profiles, which differ significantly from those expected from a classical expansion, unveil important two-dimensional effects of the dynamics of these plasmas. A second DGI customized to operate in combination with a 14.7 nm Ni-like Pd transient gain laser was used to perform interferometry of line focus laser-created plasmas with picosecond time resolution. These measurements provide valuable new benchmarks for complex hydrodynamic codes and help bring new understanding of the dynamics of dense plasmas. The instrumentation and methodology we describe is scalable to significantly shorter wavelengths, and constitutes a promising scheme for extending interferometry to the study of very dense plasmas such as those investigated for inertial confinement fusion.
Date:
December 4, 2003
Creator:
Dunn, J.; Nilsen, J.; Moon, S.; Keenan, R.; Jankowska, E.; Maconi, M. C. et al.
Object Type:
Article
System:
The UNT Digital Library
The Kerens Tribune (Kerens, Tex.), Vol. 111, No. 49, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from Kerens, Texas that includes local, state and national news along with extensive advertising.
Date:
December 4, 2003
Creator:
Williams, Neal
Object Type:
Newspaper
System:
The Portal to Texas History
De Leon Free Press (De Leon, Tex.), Vol. 114, No. 23, Ed. 1 Thursday, December 4, 2003
Weekly newspaper from De Leon, Texas that includes local, state, and national news along with advertising.
Date:
December 4, 2003
Creator:
Morgan, Jerry
Object Type:
Newspaper
System:
The Portal to Texas History