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623 Matching Results
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CARBON-13 NMR OR SOLID STATE HYDROCARBONS AND RELATED SUBSTANCES-FINAL REPORT
CARBON-13 NMR OR SOLID STATE HYDROCARBONS AND RELATED SUBSTANCES-FINAL REPORT Abstract: During recent years we have been engaged in SSNMR (Solid State NMR) structural studies of unusual tetracyanoethylene compounds with unusually long bonds between four carbons centered on two electrons. The chemical shift tensors reflect these unusual atomic arrangements. Quantum chemistry predicts the strange tensor shifts. The three dimensional molecular structure may be determined in this manner. Despite significant advances in structural determination from powder diffraction data, NMR shift tensors argument the structural accuracy and also suggest initial trial structures. Mixtures of polymorphs are difficult to analyze with diffraction methods whereas the SSNMR methods are able to characterize such mixtures in one another’s presence. Spectroscopic developments in our laboratory include SSNMR INADEQUATE and FIREMAT methods. We have used these methods to study the 13C and 15N NMR explosive CL-20.
Date:
August 16, 2007
Creator:
Grant, David M.
Object Type:
Report
System:
The UNT Digital Library
[Carnival passport, 2007]
A document about the UNT Multicultural Center's Carnival event. It has a list of countries for students to mark which booths they've visited during the event.
Date:
August 16, 2007
Creator:
University of North Texas. Multicultural Center.
Object Type:
Text
System:
The UNT Digital Library
Case Study: Northeast Asian Energy Cooperation Council (NAECC) - facilitation of a regional energy project
A case study describing the functions of the Northeast Asian Energy Cooperation Council (NAECC).
Date:
November 16, 2007
Creator:
Kreyling, Sean J.
Object Type:
Report
System:
The UNT Digital Library
CFD Analysis for the Applicability of the Natural Convection Shutdown Heat Removal Test Facility (NSTF) for the Simulation of the Vhtr Rccs. Topical Report.
The Very High Temperature gas cooled reactor (VHTR) is one of the GEN IV reactor concepts that have been proposed for thermochemical hydrogen production and other process-heat applications like coal gasification. The USDOE has selected the VHTR for further research and development, aiming to demonstrate emissions-free electricity and hydrogen production at a future time. One of the major safety advantages of the VHTR is the potential for passive decay heat removal by natural circulation of air in a Reactor Cavity Cooling System (RCCS). The air-side of the RCCS is very similar to the Reactor Vessel Auxiliary Cooling System (RVACS) that has been proposed for the PRISM reactor design. The design and safety analysis of the RVACS have been based on extensive analytical and experimental work performed at ANL. The Natural Convective Shutdown Heat Removal Test Facility (NSTF) at ANL that simulates at full scale the air-side of the RVACS was built to provide experimental support for the design and analysis of the PRISM RVACS system. The objective of this work is to demonstrate that the NSTF facility can be used to generate RCCS experimental data: to validate CFD and systems codes for the analysis of the RCCS; and to support …
Date:
May 16, 2007
Creator:
Tzanos, C. P.
Object Type:
Report
System:
The UNT Digital Library
Characterization and Qualification of New TATB and Kel-F 800 for LX-17
The project would (1) compare new FK-800 with old Kel-F 800 and KF-800 lots currently available at LLNL, (2) compare and characterize new TATB with old TATB, (3) formulate new FK-800 with wet-aminated TATB and new TATBs in according to HAAP slurry coating procedure into LX-17-2, and (4) evaluate the mechanical and detonation performance characteristics of this insensitive high explosive (IHE). Priorities will be to prove that these new materials can be formulated, pressed to density and machined; and that they contain no impurities which might cause compatibility issues. Since 3M [1, 2], LANL [7], Pantex [8] and AWE [9, 10] are currently evaluating the new FK-800, we plan to share data rather than repeating their work. Our effort is briefly described: Task 1--Evaluation of newer characterization methods to identify structural variations between old and new Kel-F 800 including: Rheological and mechanical properties, copolymer content, degree of crystallinity, and interfacial interactions with TATB. Task 2--Evaluate TATBs using scattering techniques to replace sieving operations called out in the specification [12] for particle size distribution measurements. Use SEM and OM for morphological differences between the old and new explosives. Evaluate the compaction characteristics of new TATB. Task 3--Formulation of new LX-17-2 (with …
Date:
February 16, 2007
Creator:
Hoffman, D. M. & DePiero, S. C.
Object Type:
Report
System:
The UNT Digital Library
Charm Meson Spectroscopy at BaBar and CLEO-C
In this mini-review we report on the most recent progress in charm meson spectroscopy. We discuss the precision measurements performed by the BABAR and CLEO-c experiments in the non strange charm meson part and we present the newly discovered strange charmed meson excited states.
Date:
October 16, 2007
Creator:
Zghiche, A.
Object Type:
Article
System:
The UNT Digital Library
Chemical Facility Security: Regulation and Issues for Congress
This report provides information about the Regulation and Issues for Congress in Chemical Facility Security. The proposed security regulations will preempt local and facility submission.
Date:
February 16, 2007
Creator:
Shea, Dana A. & Tatelman, Todd B.
Object Type:
Report
System:
The UNT Digital Library
Cherokeean Herald (Rusk, Tex.), Vol. 158, No. 12, Ed. 1 Wednesday, May 16, 2007
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
May 16, 2007
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
[Christie Stewart chasing the ball]
Photograph of Christie Stewart chasing the soccer ball during a game between the Mean Green and Grambling State. An opponent is running up behind her and some of her teammates are following. The stands and attendees are visible in the distance.
Date:
September 16, 2007
Creator:
Baugh, Brian
Object Type:
Photograph
System:
The UNT Digital Library
[Cindy Longacre giving workshop during CSLA conference]
Photograph of Cindy Longacre giving a workshop titled "managing your congregation's small library" during the 40th anniversary Church and Synagogue Library Association conference held at the Inn at Valley Forge in King of Prussia, Pennsylvania.
Date:
July 16, 2007
Creator:
Olson, Mark
Object Type:
Photograph
System:
The UNT Digital Library
Citizens' Advocate (Coppell, Tex.), Vol. 23, No. 7, Ed. 1 Friday, February 16, 2007
Weekly newspaper from Coppell, Texas that includes local, state, and national news along with advertising.
Date:
February 16, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Citizens' Advocate (Coppell, Tex.), Vol. 23, No. 11, Ed. 1 Friday, March 16, 2007
Weekly newspaper from Coppell, Texas that includes local, state, and national news along with advertising.
Date:
March 16, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Citizens' Advocate (Coppell, Tex.), Vol. 23, No. 36, Ed. 1 Friday, November 16, 2007
Weekly newspaper from Coppell, Texas that includes local, state, and national news along with advertising.
Date:
November 16, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Classification of Multiple Types of Organic Carbon Composition in Atmospheric Particles by Scanning Transmission X-Ray Microscopy Analysis
A scanning transmission X-ray microscope at the Lawrence Berkeley National Laboratory is used to measure organic functional group abundance and morphology of atmospheric aerosols. We present a summary of spectra, sizes, and shapes observed in 595 particles that were collected and analyzed between 2000 and 2006. These particles ranged between 0.1 and 12 mm and represent aerosols found in a large range of geographical areas, altitudes, and times. They include samples from seven different field campaigns: PELTI, ACE-ASIA, DYCOMS II, Princeton, MILAGRO (urban), MILAGRO (C-130), and INTEX-B. At least 14 different classes of organic particles show different types of spectroscopic signatures. Different particle types are found within the same region while the same particle types are also found in different geographical domains. Particles chemically resembling black carbon, humic-like aerosols, pine ultisol, and secondary or processed aerosol have been identified from functional group abundance and comparison of spectra with those published in the literature.
Date:
May 16, 2007
Creator:
Kilcoyne, Arthur L; Takahama, S.; Gilardoni, S.; Russell, L.M. & Kilcoyne, A.L.D.
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 112, No. 20, Ed. 1 Wednesday, May 16, 2007
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 16, 2007
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Climate Change: Design Approaches for a Greenhouse Gas Reduction Program
This report discusses design approaches for a Greenhouse Gas reduction program related to Climate change.
Date:
January 16, 2007
Creator:
Parker, Larry
Object Type:
Report
System:
The UNT Digital Library
Climate Change: Financial Risks to Federal and Private Insurers in Coming Decades Are Potentially Significant
A letter report issued by the Government Accountability Office with an abstract that begins "Weather-related events have cost the nation billions of dollars in damages over the past decade. Many of these losses are borne by private insurers and by two federal insurance programs--the National Flood Insurance Program (NFIP), which insures properties against flooding, and the Federal Crop Insurance Corporation (FCIC), which insures crops against drought or other weather disasters. GAO was asked to (1) describe how climate change may affect future weather-related losses, (2) determine past insured weather-related losses, and (3) determine what major private insurers and federal insurers are doing to prepare for potential increases in such losses. In response, among other things, GAO reviewed key scientific assessments; analyzed insured loss data; and contacted private insurers, NFIP, and FCIC."
Date:
March 16, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 26, No. 15, Ed. 1 Wednesday, May 16, 2007
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
May 16, 2007
Creator:
Bick, Jack & Crimmins, Blaine
Object Type:
Newspaper
System:
The Portal to Texas History
Comanche Chief (Comanche, Tex.), No. 16, Ed. 1 Thursday, August 16, 2007
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
August 16, 2007
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
Commissioning Results of the LCLS Injector
The Linac Coherent Light Source (LCLS) is a SASE xray Free-Electron Laser (FEL) project presently under construction at SLAC. The injector section, from drive-laser and RF photocathode gun through first bunch compressor chicane, was installed in fall 2006. Initial system commissioning with an electron beam has recently been completed. The second phase of construction, including second bunch compressor and full linac, is planned for 2008. In this paper, we report experimental results and experience gained during the first phase of machine commissioning. This includes the cathode, drive laser, RF photocathode gun, linac booster section, S-band and X-band RF systems, first bunch compressor, and the various beam diagnostics.
Date:
November 16, 2007
Creator:
Dowell, D. H.; Akre, R.; Ding, Y.; Emma, P.; Frisch, J.; Gilevich, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Community Services Block Grants (CSBG): Funding and Reauthorization
This report contains a background information and the reauthorization of the Community Services Block Grants (CSBG).
Date:
February 16, 2007
Creator:
Spar, Karen
Object Type:
Report
System:
The UNT Digital Library
Comparative Study of Bunch Length And Arrival Time Measurements at Flash
Diagnostic devices to precisely measure the longitudinal electron beam profile and the bunch arrival time require elaborate new instrumentation techniques. At FLASH, two entirely different methods are used. The bunch profile can be determined with high precision by a transverse deflecting RF structure, but the method is disruptive and does not allow to monitor multiple bunches in a macro-pulse train. It is therefore complemented by two non-disruptive electrooptical devices, called EO and TEO. The EO setup uses a dedicated diagnostic laser synchronized to the machine RF. The longitudinal electron beam profile is encoded in the intensity profile of a chirped laser pulse and analyzed by looking at the spectral composition of the pulse. The second setup, TEO, utilizes the TiSa-based laser system used for pump-probe experiments. Here, the temporal electron shape is encoded into the spatial dimension of the laser pulse by an intersection angle between the laser and the electron beam at the EO-crystal. In this paper, we present a comparative study of bunch length and arrival time measurements performed simultaneously with all three experimental techniques.
Date:
April 16, 2007
Creator:
Schlarb, H.; Azima, A.; Dusterer, S.; Huning, M.; Knabbe, E.A.; Roehrs, M. et al.
Object Type:
Article
System:
The UNT Digital Library
COMPASS, the COMmunity Petascale project for Accelerator Science and Simulation, a board computational accelerator physics initiative
Accelerators are the largest and most costly scientific instruments of the Department of Energy, with uses across a broad range of science, including colliders for particle physics and nuclear science and light sources and neutron sources for materials studies. COMPASS, the Community Petascale Project for Accelerator Science and Simulation, is a broad, four-office (HEP, NP, BES, ASCR) effort to develop computational tools for the prediction and performance enhancement of accelerators. The tools being developed can be used to predict the dynamics of beams in the presence of optical elements and space charge forces, the calculation of electromagnetic modes and wake fields of cavities, the cooling induced by comoving beams, and the acceleration of beams by intense fields in plasmas generated by beams or lasers. In SciDAC-1, the computational tools had multiple successes in predicting the dynamics of beams and beam generation. In SciDAC-2 these tools will be petascale enabled to allow the inclusion of an unprecedented level of physics for detailed prediction.
Date:
July 16, 2007
Creator:
Cary, J. R.; Spentzouris, P.; Amundson, J.; McInnes, L.; Borland, M.; Mustapha, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Computing the Correlation and Other Things Directly From the Raw Pairs
We want a faster and more robust way to compute the correlation, expanded in Spherical (or Cartesian) Harmonics. We also want to include the cross-{ell},m data covariance that are there, but currently ignored. We don't want to get bogged down in fancy binning in x-y-z or r-{theta}-{phi}, just r. Want to just look at C{sub {ell}m} to decide how many terms to keep--or better yet the pair distributions directly.
Date:
August 16, 2007
Creator:
Brown, D. A.
Object Type:
Report
System:
The UNT Digital Library