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Jim Bell Texas Architecture Photograph Collection
128
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68
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Structure and Electronic Properties of Cerium Orthophosphate: Theory and Experiment
Structural and electronic properties of cerium orthophosphate (CePO{sub 4}) are calculated using density functional theory (DFT) with the local spin-density approximation (LSDA+U), with and without gradient corrections (GGA-(PBE)+U), and compared to X-ray diffraction and photoemission spectroscopy measurements. The density of states is found to change significantly as the Hubbard parameter U, which is applied to the Ce 4f states, is varied from 0 to 5 eV. The calculated structural properties are in good agreement with experiment and do not change significantly with U. Choosing U = 3 eV for LDSA provides the best agreement between the calculated density of states and the experimental photoemission spectra.
Date:
July 27, 2010
Creator:
Adelstein, Nicole; Mun, B. Simon; Ray, Hannah; Ross Jr, Phillip; Neaton, Jeffrey & De Jonghe, Lutgard
Object Type:
Article
System:
The UNT Digital Library
The German Economy and U.S.-German Economic Relations
This report discusses Germany's recent trends in economic performance and trade relations with the U.S. This report elaborates on these themes in three parts: historical economic performance; reform challenges facing German political leaders; and selected U.S.-German economic policy differences.
Date:
January 27, 2010
Creator:
Ahearn, Raymond J. & Belkin, Paul
Object Type:
Report
System:
The UNT Digital Library
Galaxy Clusters in the Swift/Bat Era Ii: 10 More Clusters Detected Above 15 Kev
We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/BAT all-sky survey. Among the newly BAT-discovered clusters there are: Bullet, Abell 85, Norma, and PKS 0745-19. Norma is the only cluster, among those presented here, which is resolved by BAT. For all the clusters we perform a detailed spectral analysis using XMM-Newton and Swift/BAT data to investigate the presence of a hard (non-thermal) X-ray excess. We find that in most cases the clusters emission in the 0.3-200 keV band can be explained by a multi-temperature thermal model confirming our previous results. For two clusters (Bullet and Abell 3667) we find evidence for the presence of a hard X-ray excess. In the case of the Bullet cluster, our analysis confirms the presence of a non-thermal, power-law like, component with a 20-100 keV flux of 3.4 x 10{sup -12} erg cm{sup -2} s{sup -1} as detected in previous studies. For Abell 3667 the excess emission can be successfully modeled as a hot component (kT = {approx}13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely thermal origin.
Date:
October 27, 2010
Creator:
Ajello, M.; Rebusco, P.; Cappelluti, N.; Reimer, O.; Boehringer, H.; La Parola, V. et al.
Object Type:
Article
System:
The UNT Digital Library
A Survey of Wireless Communications for the Electric Power System
A key mission of the U.S. Department of Energy (DOE) Office of Electricity Delivery and Energy Reliability (OE) is to enhance the security and reliability of the nation’s energy infrastructure. Improving the security of control systems, which enable the automated control of our energy production and distribution, is critical for protecting the energy infrastructure and the integral function that it serves in our lives. The DOE-OE Control Systems Security Program provides research and development to help the energy industry actively pursue advanced security solutions for control systems. The focus of this report is analyzing how, where, and what type of wireless communications are suitable for deployment in the electric power system and to inform implementers of their options in wireless technologies. The discussions in this report are applicable to enhancing both the communications infrastructure of the current electric power system and new smart system deployments. The work described in this report includes a survey of the following wireless technologies: • IEEE 802.16 d and e (WiMAX) • IEEE 802.11 (Wi-Fi) family of a, b, g, n, and s • Wireless sensor protocols that use parts of the IEEE 802.15.4 specification: WirelessHART, International Society of Automation (ISA) 100.11a, and Zigbee • …
Date:
January 27, 2010
Creator:
Akyol, Bora A.; Kirkham, Harold; Clements, Samuel L. & Hadley, Mark D.
Object Type:
Report
System:
The UNT Digital Library
"Good" Digital Collections
This Tech Talks presentation covers the principles that apply to "good" digital collections and analyzes how objects, metadata, and the user interface together create the users' experience of a collection.
Date:
January 27, 2010
Creator:
Alemneh, Daniel Gelaw
Object Type:
Presentation
System:
The UNT Digital Library
Graduate Artist Certificate Recital: 2010-09-27 – Reuben Allred, piano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Graduate Artist Certificate in Music Performance.
Date:
September 27, 2010
Creator:
Allred, Reuben
Object Type:
Sound
System:
The UNT Digital Library
A Pilot Study of the Effectiveness of Indoor Plants for Removal of Volatile Organic Compounds in Indoor Air in a Seven-Story Office Building
The Paharpur Business Centre and Software Technology Incubator Park (PBC) is a 7 story, 50,400 ft{sup 2} office building located near Nehru Place in New Delhi India. The occupancy of the building at full normal operations is about 500 people. The building management philosophy embodies innovation in energy efficiency while providing full service and a comfortable, safe, healthy environment to the occupants. Provision of excellent Indoor Air Quality (IAQ) is an expressed goal of the facility, and the management has gone to great lengths to achieve it. This is particularly challenging in New Delhi, where ambient urban pollution levels rank among the worst on the planet. The approach to provide good IAQ in the building includes a range of technical elements: air washing and filtration of ventilation intake air from rooftop air handler, the use of an enclosed rooftop greenhouse with a high density of potted plants as a bio-filtration system, dedicated secondary HVAC/air handling units on each floor with re-circulating high efficiency filtration and UVC treatment of the heat exchanger coils, additional potted plants for bio-filtration on each floor, and a final exhaust via the restrooms located at each floor. The conditioned building exhaust air is passed through an …
Date:
April 27, 2010
Creator:
Apte, Michael G. & Apte, Joshua S.
Object Type:
Report
System:
The UNT Digital Library
Observation of snake resonances at Relativistic Heavy Ion Collider
The Siberian snakes are powerful tools in preserving polarization in high energy accelerators has been demonstrated at the Brookhaven Relativistic Heavy Ion Collider (RHIC). Equipped with two full Siberian snakes in each ring, polarization is preserved during acceleration from injection to 100 GeV. However, the Siberian snakes also introduce a new set of depolarization resonances, i.e. snake resonances as first discovered by Lee and Tepikian. The intrinsic spin resonances above 100 GeV are about a factor of two stronger than those below 100 GeV which raises the challenge to preserve the polarization up to 250 GeV. In 2009, polarized protons collided for the first time at the RHIC design store energy of 250 GeV. This paper presents the experimental measurements of snake resonances at RHIC. The plan for avoiding these resonances is also presented.
Date:
September 27, 2010
Creator:
Bai, M.; Ahrens, L.; Alekseev, I.G.; Alessi, J. & al, et
Object Type:
Article
System:
The UNT Digital Library
Relativistic Heavy Ion Collider spin flipper commissioning plan
The commissioning of the RHIC spin flipper in the RHIC Blue ring during the RHIC polarized proton run in 2009 showed the detrimental effects of global vertical coherent betatron oscillation induced by the 2-AC dipole plus 4-DC dipole configuration. This global orbital coherent oscillation of the RHIC beam in the Blue ring in the presence of collision modulated the beam-beam interaction between the two RHIC beams and affected Yellow beam lifetime. The experimental data at injection with different spin tunes by changing the snake current also demonstrated that it was not possible to induce a single isolated spin resonance with the global vertical coherent betatron oscillation excited by the two AC dipoles. Hence, RHIC spin flipper was re-designed to eliminate the coherent vertical betatron oscillation outside the spin flipper by adding three additional AC dipoles. This paper presents the experimental results as well as the new design.
Date:
September 27, 2010
Creator:
Bai, M.; Dawson, C.; Makdisi, Y.; Meng, W.; Meot, F.; Oddo, P. et al.
Object Type:
Article
System:
The UNT Digital Library
Defense Logistical Support Contracts in Iraq and Afghanistan: Issues for Congress
This report examines logistical support contracts for troop support services in Iraq and Afghanistan (for Afghanistan, beginning with LOGCAP IV) administered through the U.S. Army's Logistics Civil Augmentation Program (LOGCAP). LOGCAP is an initiative designed to manage the use of civilian contractors that perform services during times of war and other military mobilizations.
Date:
January 27, 2010
Creator:
Bailey Grasso, Valerie
Object Type:
Report
System:
The UNT Digital Library
HEP Science Network Requirements
The Energy Sciences Network (ESnet) is the primary provider of network connectivity for the US Department of Energy Office of Science, the single largest supporter of basic research in the physical sciences in the United States. In support of the Office of Science programs, ESnet regularly updates and refreshes its understanding of the networking requirements of the instruments, facilities, scientists, and science programs that it serves. This focus has helped ESnet to be a highly successful enabler of scientific discovery for over 20 years. In August 2009 ESnet and the Office of High Energy Physics (HEP), of the DOE Office of Science, organized a workshop to characterize the networking requirements of the programs funded by HEP. The International HEP community has been a leader in data intensive science from the beginning. HEP data sets have historically been the largest of all scientific data sets, and the communty of interest the most distributed. The HEP community was also the first to embrace Grid technologies. The requirements identified at the workshop are summarized below, and described in more detail in the case studies and the Findings section: (1) There will be more LHC Tier-3 sites than orginally thought, and likely more Tier-2 …
Date:
April 27, 2010
Creator:
Bakken, Jon; Barczyk, Artur; Blatecky, Alan; Boehnlein, Amber; Carlson, Rich; Chekanov, Sergei et al.
Object Type:
Report
System:
The UNT Digital Library
Higher Order Mode Heating Analysis for the ILC Superconducting Linacs
The superconducting cavities and interconnects in the 11 km long linacs of the International Linear Collider (ILC) are designed to operate at 2K, where cooling costs are very expensive. It is thus important to minimize cryogenic heat loads. In addition to an unavoidable static load and the dynamic load of the fundamental 1.3 GHz accelerating rf, a further heat source is presented by the higher order mode (HOM) power deposited by the beam. Such modes will be damped by specially designed HOM couplers attached to the cavities (for trapped modes), and by ceramic dampers at 70K that are located between the eight or nine cavity cryomodules (for propagating modes). Brute force calculation of the higher frequency modes excited in a string of cryomodules is limited by computing capacity (see, e.g. [1]). M. Liepe has calculated {approx} 400 longitudinal TM modes in 3 superconducting cavities plus absorbers, up to 8 GHz [2]. Joestingmeier, et al., have used a ray tracing calculation to find the effect at higher frequencies, specifically in the range of tens of GHz and above [3]. In this report we present a scattering matrix approach, which we apply to an rf unit comprising 26 cavities and 3 absorbers. …
Date:
October 27, 2010
Creator:
Bane, K. L. F.; Nantista, C. & Adolphsen, C.
Object Type:
Article
System:
The UNT Digital Library
Gap Assessment in the Emergency Response Community
This report describes a gap analysis of the emergency response and management (EM) community, performed during the fall of 2009. Pacific Northwest National Laboratory (PNNL) undertook this effort to identify potential improvements to the functional domains in EM that could be provided by the application of current or future technology. To perform this domain-based gap analysis, PNNL personnel interviewed subject matter experts (SMEs) across the EM domain; to make certain that the analyses reflected a representative view of the community, the SMEs were from a variety of geographic areas and from various sized communities (urban, suburban, and rural). PNNL personnel also examined recent and relevant after-action reports and U.S. Government Accountability Office reports.
Date:
September 27, 2010
Creator:
Barr, Jonathan L.; Burtner, Edwin R.; Pike, William A.; Peddicord, Annie M Boe & Minsk, Brian S.
Object Type:
Report
System:
The UNT Digital Library
Federal Stafford Act Disaster Assistance: Presidential Declarations, Eligible Activities, and Funding
This report discusses the Robert T. Stafford Disaster Relief and Emergency Assistance Act (the Stafford Act) that authorizes the President to issue major disaster, emergency, and fire management declarations, which in turn enable federal agencies to provide assistance to state and local governments overwhelmed by catastrophes.
Date:
January 27, 2010
Creator:
Bea, Keith
Object Type:
Report
System:
The UNT Digital Library
FY2010 Supplemental for Wars, Disaster Assistance, Haiti Relief, and Other Programs
This report provides an overview of FY2010 supplemental appropriations and discusses this year's supplemental focused on the effect on the deficit of additional spending.
Date:
July 27, 2010
Creator:
Belasco, Amy; Else, Daniel H.; Lindsay, Bruce R.; Margesson, Rhoda; Nakamura, Kennon H.; Taft-Morales, Maureen et al.
Object Type:
Report
System:
The UNT Digital Library
1916 Taylor-Woods Building
Photograph of the 1916 Taylor-Woods Building on South First Street in downtown Lufkin, Texas. The two story brick building has its completion date and a name medallion on a stone top cap. Currently occupied by the Deep East Texas Council of Governments.
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1925 Pines Theater
Photograph of the front of the 1925 Pines Theater and left side alley in downtown Lufkin, Texas. The lower portion of the facade is brick with white trim, doors, a large window on the left, framed movie posters, and a recessed entryway and box office. The upper portion of the facade is a white board with ornamental green designs with a red and white marquee, and an electric red sign protruding from beige pilasters that says "Pines."
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1925 Pines Theater
Photograph of the front of the 1925 Pines Theater and left side alley in downtown Lufkin, Texas. The lower portion of the facade is brick with white trim, doors, a large window on the left, framed movie posters, and a recessed entryway and box office. The upper portion of the facade is a white board with ornamental green designs with a red and white marquee, and an electric red sign protruding from beige pilasters that says "Pines."
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1929 Central Fire Station
Photograph of the 1929 Central Fire Station on East Lufkin Avenue in downtown Lufkin, Texas. The building is two stories, made of brick, and has emergency vehicles parked on either side.
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1929 Central Fire Station
Photograph of a balcony on the front of the 1929 Central Fire Station in downtown Lufkin, Texas.
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1929 Central Fire Station
Photograph of the left front of the 1929 Central Fire Station in downtown Lufkin, Texas. The included building citation lists those involved with its construction.
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1929 Lufkin Central Fire Station
Photograph of the 1929 Lufkin Central Fire Station in downtown Lufkin, Texas. A white building citation appears on the left side of the brick building. Two open garage doors contain emergency vehicles. A red sport utility vehicle appears to the left, bearing the words "Lufkin fire" and "battalion I" on its side.
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1955 Angelina County Courthouse
Photograph of the southeast corner of the Angelina County Courthouse. A clock on the building's facade shows noon. A black stone Angelina County Peace Officers Memorial sits on the lawn.
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
1955 Angelina County Courthouse
Photograph of the front (south side) of the Angelina County courthouse in Lufkin, Texas. A black tiled fountain rises behind a concrete wall.
Date:
January 27, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History