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228 Matching Results
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EFFECTS OF NITRIC ACID ON CRITICALITY SAFETY ANALYSIS
As nitric acid molarity is increased, there are two competing phenomena affecting the reactivity of the system. First, there is interaction between each of the 10 wells in the basket-like insert. As the molarity of the nitric acid solution is increased (it moves from 100% water to 100% HNO{sub 3}), the hydrogen atom density decreases by about 80%. However, it remains a relatively efficient moderator. The moderating ratio of nitric acid is about 90% that of water. As the media between the wells is changed from 100% water to 100% nitric acid, the density of the media increases by 50%. A higher density typically leads to a better reflector. However, when the macroscopic scattering cross sections are considered, nitric acid is a much worse reflector than water. The effectiveness of nitric acid as a reflector is about 40% that of water. Since the media between the wells become a worse reflector and still remains an effective moderator, interaction between the wells increases. This phenomenon will cause reactivity to increase as nitric acid molarity increases. The seond phenomenon is due to the moderating ratio changing in the high concentration fissile-nitric acid solution in the 10 wells. Since the wells contain relatively …
Date:
August 18, 2011
Creator:
Williamson, B.
Object Type:
Article
System:
The UNT Digital Library
The Greensheet (Fort Worth, Tex.), Vol. 35, No. 138, Ed. 1 Thursday, August 18, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
August 18, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 41, No. 341, Ed. 1 Wednesday, August 18, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
August 18, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 42, No. 341, Ed. 1 Thursday, August 18, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
August 18, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 34, No. 134, Ed. 1 Wednesday, August 18, 2010
Free weekly newspaper that includes business and classified advertising.
Date:
August 18, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Arlington-Grand Prairie, Tex.), Vol. 35, No. 136, Ed. 1 Thursday, August 18, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
August 18, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Fort Worth, Tex.), Vol. 35, No. 137, Ed. 1 Thursday, August 18, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
August 18, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
In-situ spectro-microscopy on organic films: Mn-Phthalocyanine on Ag(100)
Metal phthalocyanines are attracting significant attention, owing to their potential for applications in chemical sensors, solar cells and organic magnets. As the electronic properties of molecular films are determined by their crystallinity and molecular packing, the optimization of film quality is important for improving the performance of organic devices. Here, we present the results of in situ low-energy electron microscopy / photoemission electron microscopy (LEEM/PEEM) studies of incorporation-limited growth [1] of manganese-phthalocyanine (MnPc) on Ag(100) surfaces. MnPc thin films were grown on both, bulk Ag(100) surface and thin Ag(100)/Fe(100) films, where substrate spin-polarized electronic states can be modified through tuning the thickness of the Ag film [2]. We also discuss the electronic structure and magnetic ordering in MnPc thin films, investigated by angle- and spin-resolved photoemission spectroscopy.
Date:
August 18, 2013
Creator:
A., Al-Mahboob; Vescovo, E. & Sadowski, J.T.
Object Type:
Article
System:
The UNT Digital Library
Single Dirac Cone Topological Surface State and Unusual Thermoelectric Property of Compounds from a New Topological Insulator Family
Angle resolved photoemission spectroscopy (ARPES) study on TlBiTe2 and TlBiSe2 from a Thallium-based III-V-VI2 ternary chalcogenides family revealed a single surface Dirac cone at the center of the Brillouin zone for both compounds. For TlBiSe{sub 2}, the large bulk gap ({approx} 200meV) makes it a topological insulator with better mechanical properties than the previous binary 3D topological insualtor family. For TlBiTe{sub 2}, the observed negative bulk gap indicates it as a semi-metal, rather than a narrow gap semi-conductor as conventionally believed; this semi-metality naturally explains its mysteriously small thermoelectric figure of merit comparing to other compounds in the family. Finally, the unique band structures of TlBiTe{sub 2} also suggests it as a candidate for topological superconductors.
Date:
August 18, 2011
Creator:
Chen, Y.
Object Type:
Article
System:
The UNT Digital Library
LEVERAGING AGING MATERIALS DATA TO SUPPORT EXTENSION OF TRANSPORTATION SHIPPING PACKAGES SERVICE LIFE
Nuclear material inventories are increasingly being transferred to interim storage locations where they may reside for extended periods of time. Use of a shipping package to store nuclear materials after the transfer has become more common for a variety of reasons. Shipping packages are robust and have a qualified pedigree for performance in normal operation and accident conditions but are only certified over an approved transportation window. The continued use of shipping packages to contain nuclear material during interim storage will result in reduced overall costs and reduced exposure to workers. However, the shipping package materials of construction must maintain integrity as specified by the safety basis of the storage facility throughout the storage period, which is typically well beyond the certified transportation window. In many ways, the certification processes required for interim storage of nuclear materials in shipping packages is similar to life extension programs required for dry cask storage systems for commercial nuclear fuels. The storage of spent nuclear fuel in dry cask storage systems is federally-regulated, and over 1500 individual dry casks have been in successful service up to 20 years in the US. The uncertainty in final disposition will likely require extended storage of this fuel …
Date:
August 18, 2013
Creator:
Dunn, K.; Bellamy, S.; Daugherty, W.; Sindelar, R. & Skidmore, E.
Object Type:
Article
System:
The UNT Digital Library
Scaling Relationships for Adsorption Energies of C2 Hydrocarbons on Transition Metal Surfaces
Using density functional theory calculations we show that the adsorption energies for C{sub 2}H{sub x}-type adsorbates on transition metal surfaces scale with each other according to a simple bond order conservation model. This observation generalizes some recently recognized adsorption energy scaling laws for AH{sub x}-type adsorbates to unsaturated hydrocarbons and establishes a coherent simplified description of saturated as well as unsaturated hydrocarbons adsorbed on transition metal surfaces. A number of potential applications are discussed. We apply the model to the dehydrogenation of ethane over pure transition metal catalysts. Comparison with the corresponding full density functional theory calculations shows excellent agreement.
Date:
August 18, 2011
Creator:
Jones, G
Object Type:
Article
System:
The UNT Digital Library
The Gilmer Mirror (Gilmer, Tex.), Vol. 139, No. 33, Ed. 1 Thursday, August 18, 2016
Weekly newspaper from Gilmer, Texas that includes local, state and national news along with advertising.
Date:
August 18, 2016
Creator:
Parker, Vic
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Register, Volume 42, Number 33, Pages 4031-4186, August 18, 2017
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
August 18, 2017
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Van Zandt News (Wills Point, Tex.), Vol. 33, No. 15, Ed. 1 Sunday, August 18, 2013
Weekly newspaper from Wills Point, Texas that includes local, state, and national news along with advertising.
Date:
August 18, 2013
Creator:
Vaughan, Julie
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 118, No. 33, Ed. 1 Wednesday, August 18, 2010
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
August 18, 2010
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Whitewright Sun (Whitewright, Tex.), Vol. 132, No. 32, Ed. 1 Thursday, August 18, 2016
Weekly newspaper from Whitewright, Texas that includes local, state and national news along with advertising.
Date:
August 18, 2016
Creator:
Palmer, Kimberly
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 104, No. 92, Ed. 1 Sunday, August 18, 2013
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
August 18, 2013
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Denton Record-Chronicle (Denton, Tex.), Vol. 115, No. 16, Ed. 1 Saturday, August 18, 2018
Daily newspaper from Denton, Texas that includes local, state, and national news along with advertising.
Date:
August 18, 2018
Creator:
McCrory, Sean
Object Type:
Newspaper
System:
The Portal to Texas History
Denton Record-Chronicle (Denton, Tex.), Vol. 114, No. 16, Ed. 1 Friday, August 18, 2017
Daily newspaper from Denton, Texas that includes local, state, and national news along with advertising.
Date:
August 18, 2017
Creator:
Parks, Scott K.
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 116, No. 33, Ed. 1 Wednesday, August 18, 2010
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
August 18, 2010
Creator:
Henry, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 113, No. 232, Ed. 1 Sunday, August 18, 2013
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
August 18, 2013
Creator:
Stuckly, Derrick
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 112, No. 264, Ed. 1 Saturday, August 18, 2012
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
August 18, 2012
Creator:
Deason, Gene
Object Type:
Newspaper
System:
The Portal to Texas History
ARM Climate Research Facility Monthly Instrument Report July 2010
The purpose of this report is to provide a concise but comprehensive overview of Atmospheric Radiation Measurement Climate Research Facility instrumentation status. The report is divided into the following five sections: (1) new instrumentation in the process of being acquired and deployed, (2) field campaigns, (3) existing instrumentation and progress on improvements or upgrades, (4) proposed future instrumentation, and (5) Small Business Innovation Research instrument development.
Date:
August 18, 2010
Creator:
Voyles, J. W.
Object Type:
Report
System:
The UNT Digital Library
MODELING THE IMPACT OF ELEVATED MERCURY IN DEFENSE WASTE PROCESSING FACILITY MELTER FEED ON THE MELTER OFF-GAS SYSTEM-PRELIMINARY REPORT
The Defense Waste Processing Facility (DWPF) is currently evaluating an alternative Chemical Process Cell (CPC) flowsheet to increase throughput. It includes removal of the steam-stripping step, which would significantly reduce the CPC processing time and lessen the sampling needs. However, its downside would be to send 100% of the mercury that comes in with the sludge straight to the melter. For example, the new mercury content in the Sludge Batch 5 (SB5) melter feed is projected to be 25 times higher than that in the SB4 with nominal steam stripping of mercury. This task was initiated to study the impact of the worst-case scenario of zero-mercury-removal in the CPC on the DWPF melter offgas system. It is stressed that this study is intended to be scoping in nature, so the results presented in this report are preliminary. In order to study the impact of elevated mercury levels in the feed, it is necessary to be able to predict how mercury would speciate in the melter exhaust under varying melter operating conditions. A homogeneous gas-phase oxidation model of mercury by chloride was developed to do just that. The model contains two critical parameters pertaining to the partitioning of chloride among HCl, …
Date:
August 18, 2010
Creator:
Zamecnik, J. & Choi, A.
Object Type:
Report
System:
The UNT Digital Library