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3,733 Matching Results
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Atomic resolution transmission electron microscopy of the intergranular structure of a Y{sub 2}O{sub 3}-silicon nitride ceramic
High-resolution transmission electron microscopy (HRTEM) employing focus-variation phase-reconstruction methods is used to image the atomic structure of grain boundaries in a silicon nitride ceramic at a resolution of 0.8 Angstrom
Date:
May 1, 2002
Creator:
Ziegler, A.; Kisielowski, C.; Hoffmann, M. J. & Ritchie, R. O.
Object Type:
Article
System:
The UNT Digital Library
Initial Results of IEC 62804 Draft Round Robin Testing
This presentation discusses the Initial round robin results of the IEC 62804 system voltage durability qualification test for crystalline silicon modules.
Date:
May 1, 2013
Creator:
Hacke, P.; Terwilliger, K.; Koch, S.; Weber, T.; Berghold, J.; Hoffmann, S. et al.
Object Type:
Presentation
System:
The UNT Digital Library
Gasification Plant Cost and Performance Optimization
As part of an ongoing effort of the U.S. Department of Energy (DOE) to investigate the feasibility of gasification on a broader level, Nexant, Inc. was contracted to perform a comprehensive study to provide a set of gasification alternatives for consideration by the DOE. Nexant completed the first two tasks (Tasks 1 and 2) of the ''Gasification Plant Cost and Performance Optimization Study'' for the DOE's National Energy Technology Laboratory (NETL) in 2003. These tasks evaluated the use of the E-GAS{trademark} gasification technology (now owned by ConocoPhillips) for the production of power either alone or with polygeneration of industrial grade steam, fuel gas, hydrocarbon liquids, or hydrogen. NETL expanded this effort in Task 3 to evaluate Gas Technology Institute's (GTI) fluidized bed U-GAS{reg_sign} gasifier. The Task 3 study had three main objectives. The first was to examine the application of the gasifier at an industrial application in upstate New York using a Southeastern Ohio coal. The second was to investigate the GTI gasifier in a stand-alone lignite-fueled IGCC power plant application, sited in North Dakota. The final goal was to train NETL personnel in the methods of process design and systems analysis. These objectives were divided into five subtasks. Subtasks …
Date:
May 1, 2005
Creator:
Tam, Samuel; Nizamoff, Alan; Kramer, Sheldon; Olson, Scott; Lau, Francis; Roberts, Mike et al.
Object Type:
Report
System:
The UNT Digital Library
Gate.
Patent for certain new and useful improvements in gates, including instructions and illustrations.
Date:
May 9, 1898
Creator:
Teague, Robert M.
Object Type:
Patent
System:
The Portal to Texas History
Diagnostics of discharge channels for neutralized chamber transport in heavy ion fusion
The final beam transport in the reactor chamber for heavy ion fusion in preformed plasma channels offers many attractive advantages compared to other transport modes. In the past few years, experiments at the Gesellschaft fuer Schwerionenforschung (GSI) accelerator facility have addressed the creation and investigation of discharge plasmas, designed for the transport of intense ion beams. Stable, self-standing channels of 50 cm length with currents up to 55 kA were initiated in low-pressure ammonia gas by a CO{sub 2}-laser pulse along the channel axis before the discharge is triggered. The channels were characterized by several plasma diagnostics including interferometry and spectroscopy. We also present first experiments on laser-guided intersecting discharges.
Date:
May 1, 2002
Creator:
Niemann, C.; Penache, D.; Tauschwitz, A.; Rosmej, F. B.; Neff, S.; Birkner, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Machine for Pulling Stalks.
Patent for improvements in machine for pulling stalks in which it “can break the stalks in small pieces and guide the stalks into the pulling-section of the machine; the pulling-section may be adjusted to suit the average height of the stalks and bodily raised and lowered at any time to permit the pulling-section to be carried out of the way of obstructions when occasion so demands.” (Lines 11-21) Illustration is included.
Date:
May 24, 1904
Creator:
Kirkpatrick, George Milton
Object Type:
Patent
System:
The Portal to Texas History
Senior Recital: 2015-05-28 - Gabrielle Gilliam, soprano
Access:
Use of this item is restricted to the UNT Community
A senior recital presented at the UNT College of Music Recital Hall.
Date:
May 28, 2015
Creator:
Gilliam, Gabrielle
Object Type:
Sound
System:
The UNT Digital Library
Evidence against a charge density wave on Bi(111)
The Bi(111) surface was studied by scanning tunneling microscopy (STM), transmission electron microscopy (TEM) and angle-resolved photoemission (ARPES) in order to verify the existence of a recently proposed surface charge density wave (CDW) [Ch. R. Ast and H. Hoechst Phys. Rev. Lett. 90, 016403 (2003)]. The STM and TEM results to not support a CDW scenario at low temperatures. Furthermore, the quasiparticle interference pattern observed in STM confirms the spin-orbit split character of the surface states which prevents the formation of a CDW, even in the case of good nesting. The dispersion of the electronic states observed with ARPES agrees well with earlier findings. In particular, the Fermi contour of the electron pocket at the centre of the surface Brillouin zone is found to have a hexagonal shape. However, no gap opening or other signatures of a CDW phase transition can be found in the temperature-dependent data.
Date:
May 1, 2005
Creator:
Kim, T. K.; Wells, J.; Kirkegaard, C.; Li, Z.; Hoffmann, S.V.; Gayone, J. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Doctoral Lecture Recital: 2013-05-21 – Laurissa Backlin, soprano
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
May 21, 2013
Creator:
Backlin, Laurissa
Object Type:
Sound
System:
The UNT Digital Library
The STAR Time Project Chamber
Paper presented at the International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (1999) reporting on the progress of the STAR experiment, a complex system of many detector sub-systems which have been installed in a large solenoidal magnet at the Relativistic Heavy Ion Collider (RHIC).
Date:
May 10, 1999
Creator:
Argonne National Laboratory
Object Type:
Article
System:
The UNT Digital Library
Molecular Modeling Study of Oxidative Degradation of Polyperfluoroethers Catalyzed by Iron Fluoride Surfaces : An Extended Hückel Theory Approach
Extended Hückel methods are known to be a useful tool in understanding surface phenomena. Important quantities about atoms and chemical bonds can be obtained from this computationally simple method, although caution must be exercised in interpreting the results. Application of Extended Hückel calculations to large metal clusters reveals the role of d orbitals in solids. Basic ideas of constructing model compounds have been developed. Several model systems for surface chemisorption processes are constructed in order to understand the surface catalyzed oxidative degradation of polyperfluoroethers. The activation of oxygen molecules can be explained. The Lewis acid character of the iron fluoride surface can be predicted. Based on these results, mechanisms of the degradation processes are discussed.
Date:
May 1995
Creator:
Wang, Yanbin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Technology transfer: Half-way houses. No. 17
In the fall of 1993, 1 was asked by the Center for National Security Studies (CNSS) of the Los Alamos National Laboratory (LANL) to study the ways in which technology transfer and defense conversion had been accomplished at General Atomics (GA) and Science Applications International Corporation (SAIC) by interviewing Harold Agnew, who had served as director of Los Alamos before becoming president of General Atomics in 1979, and J. Robert Beyster, who had been a staff member at Los Alamos and at General Atomics before founding SAIC in 1969. Harold Agnew readily complied with my request for an interview and also suggested that I talk to Douglas Fouquet, who is in charge of public relations at General Atomics and is their unofficial historian. Robert Beyster was not available for an interview, but, through the courtesy of John C. Hopkins, a former director of CNSS, I was able to interview SAIC`s executive vice president, Donald M. Kerr, who is also a former director at Los Alamos, and Steven Rockwood, a sector vice president at SAIC who was formerly a staff member at the Laboratory Because Agnew, Kerr, and Rockwood are all familiar with LANL, as well as with their respective companies, …
Date:
May 1, 1995
Creator:
Seidel, R.W.
Object Type:
Report
System:
The UNT Digital Library
Brenham Banner-Press (Brenham, Tex.), Vol. 52, No. 40, Ed. 1 Saturday, May 11, 1935
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
May 11, 1935
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Stereochemistry of the Cycloaddition of Unsymmetrical Phenyl Ketenes to Cyclopentadiene
This dissertation is a study involving the synthesis and chemistry of arylhaloketenes and cyclopentadiene cycloadducts, and a study of the cycloadduct isomer distribution was begun.
Date:
May 1970
Creator:
Parry, Fred H.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Harper Herald (Harper, Tex.), Vol. 40, No. 21, Ed. 1 Friday, May 27, 1955
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
May 27, 1955
Creator:
Dietel, Norman J.
Object Type:
Newspaper
System:
The Portal to Texas History
Uniting Commedia Dell’arte Traditions with the Spieltenor Repertoire
Sixteenth century commedia dell’arte actors relied on gaudy costumes, physical humor and improvisation to entertain audiences. the Spieltenor in the modern operatic repertoire has a similar comedic role. Would today’s Spieltenor benefit from consulting the commedia dell’arte’s traditions? to answer this question, I examine the commedia dell’arte’s history, stock characters and performance traditions of early troupes. the Spieltenor is discussed in terms of vocal pedagogy and the fach system. I reference critical studies of the commedia dell’arte, sources on improvisatory acting, articles on theatrical masks and costuming, the commedia dell’arte as depicted by visual artists, commedia dell’arte techniques of movement, stances and postures. in addition, I cite vocal pedagogy articles, operatic repertoire and sources on the fach system. My findings suggest that a valid relationship exists between the commedia dell’arte stock characters and the Spieltenor roles in the operatic repertoire. I present five case studies, pairing five stock characters with five Spieltenor roles. Suggestions are provided to enhance the visual, physical and dramatic elements of each role’s performance. I conclude that linking a commedia dell’arte stock character to any Spieltenor role on the basis of shared traits offers an untapped resource to create distinctive characterizations based on theatrical traditions.
Date:
May 2012
Creator:
Trahan, Corey
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Urban land-use analysis using proximate sensing imagery: a survey
This article reviews and summarizes the state-of-the-art methods and publicly available data sets from proximate sensing to support land-use analysis. Discussions highlight the challenges, strategies, and opportunities faced by the existing methods using proximate sensing imagery in urban land-use studies.
Date:
November 30, 2020
Creator:
Qiao, Zhinan & Yuan, Xiaohui
Object Type:
Article
System:
The UNT Digital Library
The Lampasas Daily Leader. (Lampasas, Tex.), Vol. 12, No. 70, Ed. 1 Thursday, May 27, 1915
Daily newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
May 27, 1915
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
Genetic Interest Assessment
Genetics is becoming increasingly integrated into peoples' lives. Different measures have been taken to try and better genetics education. This thesis examined undergraduate students at the University of North Texas not majoring in the life sciences interest in genetic concepts through the means of a Likert style survey. ANOVA analysis showed there was variation amongst the interest level in different genetic concepts. In addition age and lecture were also analyzed as contributing factors to students' interest. Both age and lecture were evaluated to see if they contributed to the interest of students in genetic concepts and neither showed statistical significance. The Genetic Interest Assessment (GIA) serves to help mediate the gap between genetic curriculum and students' interest.
Date:
May 2013
Creator:
Doughney, Erin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Aldohaloketenes and the Stereochemistry of Aldohaloketene Cycloadditions
The objective of this research problem was to synthesize aldohaloketenes and investigate the chemistry of this new class of ketenes.
Date:
May 1970
Creator:
Hoff, Edwin Frank
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Lampasas Leader. (Lampasas, Tex.), Vol. 22, No. 27, Ed. 1 Friday, May 20, 1910
Weekly newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
May 20, 1910
Creator:
Vernor, J. E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Lampasas Leader. (Lampasas, Tex.), Vol. 31, No. 28, Ed. 1 Friday, May 16, 1919
Weekly newspaper from Lampasas, Texas that includes local, state, and national news along with advertising.
Date:
May 16, 1919
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Mt. Pleasant Daily Times (Mount Pleasant, Tex.), Vol. 21, No. 57, Ed. 1 Friday, May 19, 1939
Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
May 19, 1939
Creator:
Cross, G. W.
Object Type:
Newspaper
System:
The Portal to Texas History
Aransas Pass Progress (Aransas Pass, Tex.), Vol. 13, No. 5, Ed. 1 Friday, May 21, 1926
Weekly newspaper from Aransas Pass, Texas that includes local, state, and national news along with advertising.
Date:
May 21, 1926
Creator:
Warrick, W. E.
Object Type:
Newspaper
System:
The Portal to Texas History