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Analysis of the Younger Dryas Impact Layer
We have uncovered a thin layer of magnetic grains and microspherules, carbon spherules, and glass-like carbon at nine sites across North America, a site in Belgium, and throughout the rims of 16 Carolina Bays. It is consistent with the ejecta layer from an impact event and has been dated to 12.9 ka BP coinciding with the onset of Younger Dryas (YD) cooling and widespread megafaunal extinctions in North America. At many locations the impact layer is directly below a black mat marking the sudden disappearance of the megafauna and Clovis people. The distribution pattern of the Younger Dryas boundary (YDB) ejecta layer is consistent with an impact near the Great Lakes that deposited terrestrial-like ejecta near the impact site and unusual, titanium-rich projectile-like ejecta further away. High water content associated with the ejecta, up to 28 at. percent hydrogen (H), suggests the impact occurred over the Laurentide Ice Sheet. YDB microspherules and magnetic grains are highly enriched in TiO{sub 2}. Magnetic grains from several sites are enriched in iridium (Ir), up to 117 ppb. The TiO{sub 2}/FeO, K/Th, TiO{sub 2}/Zr, Al{sub 2}O{sub 3}/FeO+MgO, CaO/Al{sub 2}O{sub 3}, REE/ chondrite, FeO/MnO ratios and SiO{sub 2}, Na{sub 2}O, K{sub 2}O, Cr{sub 2}O{sub 3}, …
Date:
February 27, 2010
Creator:
Firestone, Richard B.; West, Allen; Revay, Zsolt; Hagstrum, Jonathon T,; Belgya, Thomas; Hee, Shane S. Que et al.
Object Type:
Article
System:
The UNT Digital Library
The Bastrop Advertiser (Bastrop, Tex.), Vol. 156, No. 104, Ed. 1 Saturday, February 27, 2010
Semi-weekly newspaper from Bastrop, Texas that includes local, state and national news along with advertising.
Date:
February 27, 2010
Creator:
Wright, Cyndi
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 90, No. 42, Ed. 1 Saturday, February 27, 2010
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 27, 2010
Creator:
Halter, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Saturday, February 27, 2010
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 27, 2010
Creator:
Wray, Kelly
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Iran Sanctions
This report focuses on the United States' relationship with Iran and how the Obama Administration is handling prior administrations' economic sanctions against Iran. The Obama Administration's policy approach toward Iran has contrasted with the Bush Administration's by attempting to couple the imposition of sanctions to an active and direct U.S. effort to negotiate with Iran on the nuclear issue.
Date:
February 27, 2010
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 118, No. 41, Ed. 1 Saturday, February 27, 2010
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 27, 2010
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 112, No. 320, Ed. 1 Sunday, February 27, 2011
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 27, 2011
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 90, No. 302, Ed. 1 Sunday, February 27, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 27, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Panola Watchman (Carthage, Tex.), Vol. 139, No. 17, Ed. 1 Sunday, February 27, 2011
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
February 27, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Photograph 2012.201.B1331.0136]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Carissa Villafor"
Date:
February 27, 2011
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Polk County Enterprise (Livingston, Tex.), Vol. 129, No. 17, Ed. 1 Sunday, February 27, 2011
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
February 27, 2011
Creator:
Reddell, Valerie
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 96, No. 117, Ed. 1 Sunday, February 27, 2011
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 27, 2011
Creator:
Harmon, C. L.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sweetwater Reporter (Sweetwater, Tex.), Vol. 113, No. 090, Ed. 1 Sunday, February 27, 2011
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
February 27, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
2011 Annual Ecological Survey: Pacific Northwest National Laboratory Site
The U.S. Department of Energy (DOE) Pacific Northwest Site Office (PNSO) oversees and manages the DOE contract for the Pacific Northwest National Laboratory (PNNL), a DOE Office of Science multi-program laboratory located in Richland, Washington. PNSO is responsible for ensuring that all activities conducted on the PNNL site comply with applicable laws, policies, and DOE Orders. The DOE Pacific Northwest Site Office Cultural and Biological Resources Management Plan (DOE/PNSO 2008) addresses the requirement for annual surveys and monitoring for species of concern and to identify and map invasive species. In addition to the requirement for an annual survey, proposed project activities must be reviewed to assess any potential environmental consequences of conducting the project. The assessment process requires a thorough understanding of the resources present, the potential impacts of a proposed action to those resources, and the ultimate consequences of those actions. The PNNL site is situated on the southeastern corner of the DOE Hanford Site, located at the north end of the city of Richland in south-central Washington. The site is bordered on the east by the Columbia River, on the west by Stevens Drive, and on the north by the Hanford Site 300 Area (Figure 1). The environmental …
Date:
February 27, 2012
Creator:
Becker, James M. & Chamness, Michele A.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Improvements Needed to Strengthen Management of U.S. Civilian Presence
A letter report issued by the Government Accountability Office with an abstract that begins "U.S. agencies under Chief of Mission authority and the Department of Defense (DOD) have reported expanding their civilian presence in Afghanistan and took steps to improve their ability to track that presence. Since January 2009, U.S. agencies under Chief of Mission authority more than tripled their civilian presence from 320 to 1,142. However, although State could report total Chief of Mission numbers by agency, in mid-2011 GAO identified discrepancies in States data system used to capture more-detailed staffing information such as location and position type. State began taking steps in the fall of 2011 to improve the reliability of its data system. Also, DOD reported expanding its overall civilian presence from 394 civilians in January 2009 to 2,929 in December 2011 to help assist U.S. efforts in Afghanistan. The extent to which DODs data is reliable is unknown due to omissions and double counting, among other things. In a 2009 report, GAO noted similar data issues and recommended DOD improve data concerning deployed civilians. DOD concurred with the recommendation and expects the issues will be addressed by a new tracking system to be completed in fiscal …
Date:
February 27, 2012
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Afghanistan: Politics, Elections, and Government Performance
This report discusses the current political state of Afghanistan, as well as the Afghan government. This report also discusses Afghanistan's relationship with the United States, particularly U.S. efforts to urge President Hamid Karzai, to address corruption within the Afghan government. The report also includes discussion of election fraud and corruption in Afghanistan.
Date:
February 27, 2012
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Analysis of 2011 Meteorological Data from the Knolls Atomic Power Laboratory and Kesselring Site Operations Facilities
Both the Knolls Atomic Power Laboratory (KAPL) in Schenectady, NY and the Kesselring Site Operations (KSO) facility near Ballston Spa, NY are required to estimate the effects of hypothetical emissions of radiological material from their respective facilities by the US Environmental Protection Agency (EPA), which regulates these facilities. An atmospheric dispersion model known as CAP88, which was developed and approved by the EPA for such purposes, is used by KAPL and KSO to meet this requirement. CAP88 calculations over a given time period are based on statistical data on the meteorological conditions for that period. Both KAPL and KSO have on-site meteorological towers which take atmospheric measurements at a frequency ideal for EPA regulatory model input. However, an independent analysis and processing of the meteorological data from each tower is required to derive a data set appropriate for use in the CAP88 model. The National Atmospheric Release Advisory Center (NARAC) was contracted by KAPL to process the on-site data for the calendar year 2011. The purpose of this document is to: (1) summarize the procedures used in the preparation/analysis of the 2011 meteorological data; and (2) document adherence of these procedures to the guidance set forth in 'Meteorological Monitoring Guidance …
Date:
February 27, 2012
Creator:
Aluzzi, F J
Object Type:
Report
System:
The UNT Digital Library
California GAMA Special Study: Stable Isotopic Composition of Boron in Groundwater - San Diego County Domestic Well Data
None
Date:
February 27, 2012
Creator:
Eppich, G. R.; Wimpenny, J. B.; Yin, Q. Z. & Esser, B. K.
Object Type:
Report
System:
The UNT Digital Library
Changes in the Arctic: Background and Issues for Congress
The diminishment of Arctic sea ice has led to increased human activities in the Arctic, and has heightened interest in, and concerns about, the region's future. The United States, by virtue of Alaska, is an Arctic country and has substantial interests in the region. The Arctic has increasingly become a subject of discussion among political leaders of the nations in the region. In varying degrees, the Arctic coastal states have indicated a willingness to establish and maintain a military presence in the high north. U.S. military forces, particularly the Navy and Coast Guard, have begun to pay more attention to the region.
Date:
February 27, 2012
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
DART and Mesquite launch express bus route in March
News release about DART and the city of Mesquite running an express bus service between Mesquite and DART's Lawnview Station.
Date:
February 27, 2012
Creator:
Lyons, Morgan & Ball, Mark
Object Type:
Text
System:
The Portal to Texas History
EFFECTIVE POROSITY IMPLIES EFFECTIVE BULK DENSITY IN SORBING SOLUTE TRANSPORT
The concept of an effective porosity is widely used in solute transport modeling to account for the presence of a fraction of the medium that effectively does not influence solute migration, apart from taking up space. This non-participating volume or ineffective porosity plays the same role as the gas phase in single-phase liquid unsaturated transport: it increases pore velocity, which is useful towards reproducing observed solute travel times. The prevalent use of the effective porosity concept is reflected by its prominent inclusion in popular texts, e.g., de Marsily (1986), Fetter (1988, 1993) and Zheng and Bennett (2002). The purpose of this commentary is to point out that proper application of the concept for sorbing solutes requires more than simply reducing porosity while leaving other material properties unchanged. More specifically, effective porosity implies the corresponding need for an effective bulk density in a conventional single-porosity model. The reason is that the designated non-participating volume is composed of both solid and fluid phases, both of which must be neglected for consistency. Said another way, if solute does not enter the ineffective porosity then it also cannot contact the adjoining solid. Conceptually neglecting the fluid portion of the non-participating volume leads to a …
Date:
February 27, 2012
Creator:
Flach, G.
Object Type:
Article
System:
The UNT Digital Library
Energy Saving Glass Lamination via Selective Radio Frequency Heating
This project focused on advancing radio-frequency (RF) lamination technology closer to commercial implementation, in order to reduce the energy intensity of glass lamination by up to 90%. Lamination comprises a wide range of products including autoglass, architectural safety and innovative design glass, transparent armor (e.g. bullet proof glass), smart glass, mirrors, and encapsulation of photovoltaics. Lamination is also the fastest growing segment of glass manufacturing, with photovoltaics, architectural needs, and an anticipated transition to laminated side windows in vehicles. The state-of-the-art for glass lamination is to use autoclaves, which apply heat and uniform gas pressure to bond the laminates over the course of 1 to 18 hours. Laminates consist of layers of glass or other materials bonded with vinyl or urethane interlayers. In autoclaving, significant heat energy is lost heating the chamber, pressurized air, glass racks, and the glass. In RF lamination, the heat is generated directly in the vinyl interlayer, causing it to heat and melt quickly, in just 1 to 10 minutes, without significantly heating the glass or the equipment. The main purpose of this project was to provide evidence that low energy, rapid RF lamination quality met the same standards as conventionally autoclaved windows. The development of …
Date:
February 27, 2012
Creator:
Allan, Shawn M.; Baranova, Inessa; Poley, Joseph & Reis, Henrique
Object Type:
Report
System:
The UNT Digital Library
Energy Saving Glass Lamination via Selective Radio Frequency Heating
This project focused on advancing radio-frequency (RF) lamination technology closer to commercial implementation, in order to reduce the energy intensity of glass lamination by up to 90%. Lamination comprises a wide range of products including autoglass, architectural safety and innovative design glass, transparent armor (e.g. bullet proof glass), smart glass, mirrors, and encapsulation of photovoltaics. Lamination is also the fastest growing segment of glass manufacturing, with photovoltaics, architectural needs, and an anticipated transition to laminated side windows in vehicles. The state-of-the-art for glass lamination is to use autoclaves, which apply heat and uniform gas pressure to bond the laminates over the course of 1 to 18 hours. Laminates consist of layers of glass or other materials bonded with vinyl or urethane interlayers. In autoclaving, significant heat energy is lost heating the chamber, pressurized air, glass racks, and the glass. In RF lamination, the heat is generated directly in the vinyl interlayer, causing it to heat and melt quickly, in just 1 to 10 minutes, without significantly heating the glass or the equipment. The main purpose of this project was to provide evidence that low energy, rapid RF lamination quality met the same standards as conventionally autoclaved windows. The development of …
Date:
February 27, 2012
Creator:
Allan, Shawn M.
Object Type:
Report
System:
The UNT Digital Library
Faculty: 2012-02-27 - Elizabeth McNutt, flutes
Access:
Use of this item is restricted to the UNT Community
A faculty recital presented UNT College of Music Merrill Ellis Intermedia Theater.
Date:
February 27, 2012
Creator:
McNutt, Elizabeth
Object Type:
Sound
System:
The UNT Digital Library