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4-wave mixing for phase-matching free nonlinear optics in quantum cascade structures : LDRD 08-0346 final report.
Optical nonlinearities and quantum coherences have the potential to enable efficient, high-temperature generation of coherent THz radiation. This LDRD proposal involves the exploration of the underlying physics using intersubband transitions in a quantum cascade structure. Success in the device physics aspect will give Sandia the state-of-the-art technology for high-temperature THz quantum cascade lasers. These lasers are useful for imaging and spectroscopy in medicine and national defense. Success may have other far-reaching consequences. Results from the in-depth study of coherences, dephasing and dynamics will eventually impact the fields of quantum computing, optical communication and cryptology, especially if we are successful in demonstrating entangled photons or slow light. An even farther reaching development is if we can show that the QC nanostructure, with its discrete atom-like intersubband resonances, can replace the atom in quantum optics experiments. Having such an 'artificial atom' will greatly improve flexibility and preciseness in experiments, thereby enhancing the discovery of new physics. This is because we will no longer be constrained by what natural can provide. Rather, one will be able to tailor transition energies and optical matrix elements to enhance the physics of interest. This report summarizes a 3-year LDRD program at Sandia National Laboratories exploring optical …
Date:
October 1, 2010
Creator:
Chow, Weng Wah; Wanke, Michael Clement; Allen, Dan G.; Yang, Zhenshan & Waldmueller, Ines
Object Type:
Report
System:
The UNT Digital Library
7.5 Minute Quadrangle Project
Presentation for the 2010 Depository Library Council Annual Meeting. This presentation discusses the 7.5 minute quadrangle project by the University of North Texas (UNT) Libraries' Digital Projects Unit and gives the background, goals, processes, challenges, and next steps.
Date:
October 18, 2010
Creator:
Phillips, Mark Edward
Object Type:
Presentation
System:
The UNT Digital Library
[24-Hour Film Feast with Melvin Van Peebles tape 1]
Video footage from The Black Academy of Arts and Letters recorded during TBAALs 34th season 24-Hour Filmfeast featuring director Melvin Van Peebles. The footage features a live Q&A discussion with the director where he takes questions from the audience while going into detail about his early life and career.
Date:
October 30, 2010
Creator:
Peebles, Melvin Van
Object Type:
Video
System:
The UNT Digital Library
[24-Hour Film Feast with Melvin Van Peebles tape 2]
Video footage from The Black Academy of Arts and Letters recorded during TBAALs 34th season 24-Hour Filmfeast featuring director Melvin Van Peebles. The footage features a live Q&A discussion with the director where he takes questions from the audience while going into detail about his early life and career.
Date:
October 30, 2010
Creator:
Peebles, Melvin Van
Object Type:
Video
System:
The UNT Digital Library
100 Area D4 Project Building Completion Report: December 2008 to December 2009
This report documents the final status of buildings after the completion of D4 activities at the 100 Area of the U.S. Department of Energy Hanford Site from December 1, 2008, to December 31, 2009.
Date:
October 26, 2010
Creator:
K.G. Finucane, J.P. Harrie
Object Type:
Report
System:
The UNT Digital Library
100 LPW 800 Lm Warm White LED
An illumination grade warm white (WW) LED, having correlated color temperature (CCT) between 2800 K and 3500K and capable of producing 800 lm output at 100 lm/W, has been developed in this program. The high power WW LED is an ideal source for use as replacement for incandescent, and Halogen reflector and general purpose lamps of similar lumen value. Over the two year period, we have made following accomplishments: developed a high power warm white LED product and made over 50% improvements in light output and efficacy. The new high power WW LED product is a die on ceramic surface mountable LED package. It has four 1x1 mm{sup 2} InGaN pump dice flip chip attached to a ceramic submount in 2x2 array, covered by warm white phosphor ceramic platelets called Lumiramic⢠and an overmolded silicone lens encapsulating the LED array. The performance goal was achieved through breakthroughs in following key areas: (1) High efficiency pump LED development through pump LED active region design and epi growth quality improvement (funded by internal programs). (2) Increase in injection efficiency (IE) represented by reduction in forward voltage (V{sub f}) through the improvement of the silver-based p-contact and a reduction in spreading resistance. The …
Date:
October 31, 2010
Creator:
Sun, Decai
Object Type:
Report
System:
The UNT Digital Library
340 Waste handling Facility Hazard Categorization and Safety Analysis
The analysis presented in this document provides the basis for categorizing the facility as less than Hazard Category 3.
Date:
October 25, 2010
Creator:
Rodovsky, T. J.
Object Type:
Report
System:
The UNT Digital Library
501(c)(4) Organizations and Campaign Activity: Analysis Under Tax and Campaign Finance Laws
This report discusses requirements to maintain 501(c)(4) status, potential tax consequences, and reporting requirements to file with the Internal Revenue Service.
Date:
October 21, 2010
Creator:
Lunder, Erika K. & Whitaker, L. Paige
Object Type:
Report
System:
The UNT Digital Library
The 2007-2009 Recession: Similarities to and Differences from the Past
According to the National Bureau of Economic Research (NBER), the U.S. economy was in a recession for 18 months from December 2007 to June 2009. It was the longest and deepest recession of the post-World War II era. This report provides information on the patterns found across past recessions since World War II to gauge whether and how this recession might be different.
Date:
October 6, 2010
Creator:
Labonte, Marc
Object Type:
Report
System:
The UNT Digital Library
2008 East Tennessee Technology Park Annual Illness and Injury Surveillance Report
The U.S. Department of Energy’s (DOE) commitment to assuring the health and safety of its workers includes the conduct of epidemiologic surveillance activities that provide an early warning system for health problems among workers. The Illness and Injury Surveillance Program monitors illnesses and health conditions that result in an absence of workdays, occupational injuries and illnesses, and disabilities and deaths among current workers.
Date:
October 26, 2010
Creator:
United States. Department of Energy. Office of Illness and Injury Prevention Programs.
Object Type:
Report
System:
The UNT Digital Library
21st Century Locomotive Technology: Technical Status Report 30
Analysis of specific missions shows that combining Trip Optimization techniques with Hybrid Energy Storage increases energy savings.
Date:
October 29, 2010
Creator:
Salasoo, Lembit
Object Type:
Report
System:
The UNT Digital Library
3D Thermal and Electrochemical Model for Spirally Wound Large Format Lithium-ion Batteries
In many commercial cells, long tabs at both cell sides, leading to uniform potentials along the spiral direction of wound jelly rolls, are rarely seen because of their high manufacturing cost. More often, several metal strips are welded at discrete locations along both current collector foils. With this design, the difference of electrical potentials is easily built up along current collectors in the spiral direction. Hence, the design features of the tabs, such as number, location and size, can be crucial factors for spiral-shaped battery cells. This paper presents a Li-ion battery cell model having a 3-dimensional spiral mesh involving a wound jellyroll structure. Further results and analysis will be given regarding impacts of tab location, number, and size.
Date:
October 14, 2010
Creator:
Lee, K. J.; Kim, G. H. & Smith, K.
Object Type:
Presentation
System:
The UNT Digital Library
Accelerated Testing and On-Sun Failure of CPV Die-Attach
Accelerated Testing and On-Sun Failure of CPV Die-attach. Presentation on CPV accelerated reliability testing.
Date:
October 1, 2010
Creator:
Bosco, N.; Kurtz, S. & Stokes, A.
Object Type:
Presentation
System:
The UNT Digital Library
Accelerated Vehicle Retirement Programs in Japan and South Korea: Background for Congress
This report discusses the accelerated vehicle retirement (AVR) programs initiated in 2009 by the United States, Japan, South Korea, and other industrial nations (commonly known in the U.S. as the "cash for clunkers" program). The U.S. program began in June 2009, when President Obama signed the Consumer Assistance to Recycle and Save (CARS) Act. The report discusses how these various AVR programs affected the automobile industries in the U.S., Japan, and South Korea, specifically. Neither Japan nor South Korea imports large numbers of foreign vehicles, a circumstance not much altered by AVR program implementation.
Date:
October 26, 2010
Creator:
Canis, Bill; Grimmett, Jeanne J.; Platzer, Michaela D. & Yacobucci, Brent D.
Object Type:
Report
System:
The UNT Digital Library
ACE3P Computations of Wakefield Coupling in the CLIC Two-Beam Accelerator
The Compact Linear Collider (CLIC) provides a path to a multi-TeV accelerator to explore the energy frontier of High Energy Physics. Its novel two-beam accelerator concept envisions rf power transfer to the accelerating structures from a separate high-current decelerator beam line consisting of power extraction and transfer structures (PETS). It is critical to numerically verify the fundamental and higher-order mode properties in and between the two beam lines with high accuracy and confidence. To solve these large-scale problems, SLAC's parallel finite element electromagnetic code suite ACE3P is employed. Using curvilinear conformal meshes and higher-order finite element vector basis functions, unprecedented accuracy and computational efficiency are achieved, enabling high-fidelity modeling of complex detuned structures such as the CLIC TD24 accelerating structure. In this paper, time-domain simulations of wakefield coupling effects in the combined system of PETS and the TD24 structures are presented. The results will help to identify potential issues and provide new insights on the design, leading to further improvements on the novel CLIC two-beam accelerator scheme.
Date:
October 27, 2010
Creator:
Candel, Arno; Li, Z.; Ng, C.; Rawat, V.; Schussman, G.; Ko, K. et al.
Object Type:
Article
System:
The UNT Digital Library
[Across from Old Jail]
Photograph of the old red brick Atascosa County jail building, seen from across the street, in Jourdanton, Texas. A red truck is parked to the left, and trees are visible around the jail.
Date:
October 13, 2010
Creator:
Bell, Jim
Object Type:
Photograph
System:
The Portal to Texas History
Active infrared materials for beam steering.
The mid-infrared (mid-IR, 3 {micro}m -12 {micro}m) is a highly desirable spectral range for imaging and environmental sensing. We propose to develop a new class of mid-IR devices, based on plasmonic and metamaterial concepts, that are dynamically controlled by tunable semiconductor plasma resonances. It is well known that any material resonance (phonons, excitons, electron plasma) impacts dielectric properties; our primary challenge is to implement the tuning of a semiconductor plasma resonance with a voltage bias. We have demonstrated passive tuning of both plasmonic and metamaterial structures in the mid-IR using semiconductors plasmas. In the mid-IR, semiconductor carrier densities on the order of 5E17cm{sup -3} to 2E18cm{sup -3} are desirable for tuning effects. Gate control of carrier densities at the high end of this range is at or near the limit of what has been demonstrated in literature for transistor style devices. Combined with the fact that we are exploiting the optical properties of the device layers, rather than electrical, we are entering into interesting territory that has not been significantly explored to date.
Date:
October 1, 2010
Creator:
Brener, Igal; Reno, John Louis; Passmore, Brandon Scott; Gin, Aaron V.; Shaner, Eric Arthur; Miao, Xiaoyu et al.
Object Type:
Report
System:
The UNT Digital Library
Actual Farm Bill Spending and Cost Estimates
This report discusses the budget for the 2008 Farm Bill, and its reauthorization. Moreover, the report discusses the increasing level of demand for fiscal constraint and the current large budget deficits.
Date:
October 7, 2010
Creator:
Monke, Jim & Johnson, Renée
Object Type:
Report
System:
The UNT Digital Library
Advanced analysis methods in particle physics
Each generation of high energy physics experiments is grander in scale than the previous - more powerful, more complex and more demanding in terms of data handling and analysis. The spectacular performance of the Tevatron and the beginning of operations of the Large Hadron Collider, have placed us at the threshold of a new era in particle physics. The discovery of the Higgs boson or another agent of electroweak symmetry breaking and evidence of new physics may be just around the corner. The greatest challenge in these pursuits is to extract the extremely rare signals, if any, from huge backgrounds arising from known physics processes. The use of advanced analysis techniques is crucial in achieving this goal. In this review, I discuss the concepts of optimal analysis, some important advanced analysis methods and a few examples. The judicious use of these advanced methods should enable new discoveries and produce results with better precision, robustness and clarity.
Date:
October 1, 2010
Creator:
Bhat, Pushpalatha C.
Object Type:
Article
System:
The UNT Digital Library
Advanced Fuels Campaign Execution Plan
The purpose of the Advanced Fuels Campaign (AFC) Execution Plan is to communicate the structure and management of research, development, and demonstration (RD&D) activities within the Fuel Cycle Research and Development (FCRD) program. Included in this document is an overview of the FCRD program, a description of the difference between revolutionary and evolutionary approaches to nuclear fuel development, the meaning of science-based development of nuclear fuels, and the “Grand Challenge” for the AFC that would, if achieved, provide a transformational technology to the nuclear industry in the form of a high performance, high reliability nuclear fuel system. The activities that will be conducted by the AFC to achieve success towards this grand challenge are described and the goals and milestones over the next 20 to 40 year period of research and development are established.
Date:
October 1, 2010
Creator:
Pasamehmetoglu, Kemal
Object Type:
Report
System:
The UNT Digital Library
Advanced Gasification Mercury/Trace Metal Control with Monolith Traps
Two Corning monoliths and a non-carbon-based material have been identified as potential additives for mercury capture in syngas at temperatures above 400°F and pressure of 600 psig. A new Corning monolith formulation, GR-F1-2189, described as an active sample appeared to be the best monolith tested to date. The Corning SR Liquid monolith concept continues to be a strong candidate for mercury capture. Both monolith types allowed mercury reduction to below 5-μg/m{sup 3} (~5 ppb), a current U.S. Department of Energy (DOE) goal for trace metal control. Preparation methods for formulating the SR Liquid monolith impacted the ability of the monolith to capture mercury. The Energy & Environmental Research Center (EERC)-prepared Noncarbon Sorbents 1 and 2 appeared to offer potential for sustained and significant reduction of mercury concentration in the simulated fuel gas. The Noncarbon Sorbent 1 allowed sustained mercury reduction to below 5-μg/m{sup 3} (~5 ppb). The non-carbon-based sorbent appeared to offer the potential for regeneration, that is, desorption of mercury by temperature swing (using nitrogen and steam at temperatures above where adsorption takes place). A Corning cordierite monolith treated with a Group IB metal offered limited potential as a mercury sorbent. However, a Corning carbon-based monolith containing prereduced metallic …
Date:
October 5, 2010
Creator:
Musich, Mark; Swanson, Michael; Dunham, Grant & Stanislowski, Joshua
Object Type:
Report
System:
The UNT Digital Library
Advanced Unit Commitment Strategies for the U.S. Eastern Interconnection: Preprint
This paper outlines a study undertaken for the U.S. Eastern Interconnection in which different advanced unit commitment strategies were simulated for three different years to evaluate the benefits that may occur from using these strategies as an operational tool.
Date:
October 1, 2010
Creator:
Ela, E.; Milligan, M.; Meibom, P.; Barth, R. & Tuohy, A.
Object Type:
Article
System:
The UNT Digital Library
ADVANCING REACTIVE TRACER METHODS FOR MONITORING THERMAL DRAWDOWN IN GEOTHERMAL ENHANCED GEOTHERMAL RESERVOIRS
Reactive tracers have long been considered a possible means of measuring thermal drawdown in a geothermal system, before significant cooling occurs at the extraction well. Here, we examine the sensitivity of the proposed method to evaluate reservoir cooling and demonstrate that while the sensitivity of the method as generally proposed is low, it may be practical under certain conditions.
Date:
October 1, 2010
Creator:
Plummer, Mitchell A.; Palmer, Carl D.; Mattson, Earl D.; Redden, George D. & Hull, Laurence C.
Object Type:
Article
System:
The UNT Digital Library
The Advocate, Volume 15, Issue 4, October-December 2010
Quarterly update providing information on environmental regulations for small businesses and local governments in Texas.
Date:
October 2010
Creator:
Texas Commission on Environmental Quality
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History