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Chemometric Analysis of Nuclear Magnetic Resonance Spectroscopy Data
Chemometric analysis of nuclear magnetic resonance (NMR) spectroscopy has increased dramatically in recent years. A variety of different chemometric techniques have been applied to a wide range of problems in food, agricultural, medical, process and industrial systems. This article gives a brief review of chemometric analysis of NMR spectral data, including a summary of the types of mixtures and experiments analyzed with chemometric techniques. Common experimental problems encountered during the chemometric analysis of NMR data are also discussed.
Date:
July 20, 2000
Creator:
ALAM,TODD M. & ALAM,M. KATHLEEN
Object Type:
Article
System:
The UNT Digital Library
Land-Based Geologic Emplacement of Mercury Wastes
None
Date:
July 20, 2000
Creator:
ANDERSON,D. RICHARD
Object Type:
Article
System:
The UNT Digital Library
Conductivities and Seebeck Coefficients of Boron Carbides: ''Softening-Bipolaron'' Hopping
The most conspicuous feature of boron carbides' electronic transport properties is their having both high carrier densities and large Seebeck coefficients. The magnitudes and temperature dependencies of the Seebeck coefficients are consistent with large contributions from softening bipolarons: singlet bipolarons whose stabilization is significantly affected by their softening of local vibrations. Boron carbides' high carrier densities, small activation energies for hopping ({approx} 0.16 eV), and anomalously large Seebeck coefficients combine with their low, glass-like thermal conductivities to make them unexpectedly efficient high-temperature thermoelectrics.
Date:
July 20, 2000
Creator:
ASELAGE,TERRENCE L.; EMIN,DAVID JACOB & MCCREADY,STEVEN S.
Object Type:
Article
System:
The UNT Digital Library
New Measurement of A{sub b} at the Z{sup 0} Resonance Using a Vertex Charge Technique
We present a new preliminary measurement of the parity-violation parameter A{sub b} using a self-calibrating vertex-charge technique. In the SLD experiment we observe hadronic decays of Z{sup 0} bosons produced in collisions between longitudinally polarized electrons and unpolarized positrons at the SLAC Linear Collider. A sample of b{bar b} events is selected using the topologically reconstructed mass of B hadrons. From our 1996-1998 data sample of approximately 400,000 hadronic Z{sup 0} decays, we obtain A{sub b} = 0.897 {+-} 0.027(stat){sub -0.034}{sup +0.036}(syst).
Date:
July 20, 1999
Creator:
Abe, K
Object Type:
Report
System:
The UNT Digital Library
Model for the prediction of the pressure-volume relationship of porous rocks
Several models have been suggested to describe the volume behavior of porous materials under hydrostatic loading. The model presented here accounts for variations in both porosity and the amount of fluid contained within that porosity. The model also attempts to predict the one-dimensional strain loading pressure-volume relationship and the stress difference-confining pressure curve. Only the simplest assumptions were used for the development of this model. These assumptions are discussed and the predictions for Mt. Helen tuff are compared to experimental data.
Date:
July 20, 1976
Creator:
Abey, A. E.
Object Type:
Article
System:
The UNT Digital Library
Catalog of Abilene Christian College, 1948-1949
Catalog describes the governance, history, course offerings, and campus life of Abilene Christian College in Abilene, Texas.
Date:
July 20, 1948
Creator:
Abilene Christian College
Object Type:
Book
System:
The Portal to Texas History
Oral History Interview with Lena Coleman-Wilson, July 20, 2016
Ms. Coleman-Wilson discussed growing up during desegregation and her role as president of the Hi-Alco neighborhood association.
Date:
July 20, 2016
Creator:
Acuña-Gurrola, Moisés & Coleman-Wilson, Lena
Object Type:
Video
System:
The Portal to Texas History
Oral History Interview with Verna Portis, June 14, 2016
Ms. Portis discussed growing up in segregated East Texas, attending Prairie View A&M, and her career as a Corpus Christi educator .
Date:
July 20, 2016
Creator:
Acuña-Gurrola, Moisés; Wall, James & Portis, Verna
Object Type:
Video
System:
The Portal to Texas History
The Forgan Advocate (Forgan, Okla.), Vol. 6, No. 40, Ed. 1 Thursday, July 20, 1933
Weekly newspaper from Forgan, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 20, 1933
Creator:
Adams, Aline
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Pawhuska Daily Journal-Capital (Pawhuska, Okla.), Vol. 73, No. 142, Ed. 1 Tuesday, July 20, 1982
Daily newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 20, 1982
Creator:
Adams, Bill
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oral History Interview with Marjorie Adams, July 20, 2016
Described her family's acquisition of land from former slaveowners, discrimination and segregation, political activism, and community work.
Date:
July 20, 2016
Creator:
Adams, Marjorie & Grevious, Danielle
Object Type:
Video
System:
The Portal to Texas History
The Paducah Post (Paducah, Tex.), Vol. 82, No. 22, Ed. 1 Wednesday, July 20, 1988
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
July 20, 1988
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
Convair Report to Supervision, Number 1006, July 20, 1977
Newsletter written for supervisors working at the Convair Division in Fort Worth containing news about events and activities, workplace reminders, and other relevant information.
Date:
July 20, 1977
Creator:
Adams, Richard E.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Solar still. Final report
Passive solar heating was used in a still in which a packed column packed with popped popcorn separates the alcohol and water vapors. The still's performance was not satisfactory, and it is concluded that passive solar heating could have been better used to preheat makeup water for the fermentation process and to maintain proper fermentation temperatures during the winter. (LEW)
Date:
July 20, 1983
Creator:
Adams, W.D.
Object Type:
Report
System:
The UNT Digital Library
Forney Tribune. (Forney, Tex.), Vol. 4, No. 6, Ed. 1 Wednesday, July 20, 1892
Weekly newspaper from Forney, Texas that includes local, state, and national news along with advertising.
Date:
July 20, 1892
Creator:
Adams, Walter D.
Object Type:
Newspaper
System:
The Portal to Texas History
The Edmond Enterprise (Edmond, Okla.), Vol. 22, No. 25, Ed. 1 Thursday, July 20, 1922
Weekly newspaper from Edmond, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 20, 1922
Creator:
Adamson, Royce B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oilton Gusher (Oilton, Okla.), Vol. 7, No. 7, Ed. 1 Thursday, July 20, 1922
Weekly newspaper from Oilton, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 20, 1922
Creator:
Admire, Eli L.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Your Body in Flight
Manual illustrated with cartoons for quick memorization demonstrating the effects of flight on the human body and the best practices for safe aviation.
Date:
July 20, 1943
Creator:
Aero Medical laboratory
Object Type:
Book
System:
The Portal to Texas History
Pinhole closure measurements
Spatial-filter pinholes and knife-edge samples were irradiated in vacuum by 1053-nm, 5-20 ns pulses at intensities to 500 GW/cm<sup2</sup>. The knife-edge samples were fabricated of plastic, carbon, ahnuinum, stainless steel, molybdenum, tantalum, gold and an absorbing glass. Time-resolved two-beam interferometry with a 40-ns probe pulse was used to observe phase shifts in the expanding laser-induced plasma. For all of these materials, at any time during square-pulse irradiation, the phase shift fell exponentially with distance from the edge of the sample. The expansion was characterized by the propagation velocity V<sub>2x</sub> of the contour for a 2(pi) phase shift. To within experimental error, V<sub>2x</sub>, was constant during irradiation at a particular intensity, and it increased linearly with intensity for intensities <300 GW/cn<sup>2</sup>. For metal samples, V, exhibited an approximate M<sup>-0.5</sup> dependence where M is the atomic mass. Plasmas of plastic, carbon and absorbing glass produced larger phase shifts, and expanded more rapidly, than plasmas of the heavy metals. The probe beam and interferometer were also used to observe the closing of pinholes. With planar pinholes, accumulation of on-axis plasma was observed along with the advance of plasma away from the edge of the hole. On-axis closure was not observed in square, 4-leaf …
Date:
July 20, 1998
Creator:
Afeyan, B. B.; Boley, C. D.; Estabrook, K. G.; Kirkwood, R. K.; Milam, D.; Murray, J. E. et al.
Object Type:
Article
System:
The UNT Digital Library
U.S.-EU Trade and Economic Issues
This report discusses U.S.-EU trade and economic relations, which currently face heightened tension, particularly due to the Trump Administration's trade policy, which is focusing on unilateral tariff measures under U.S. trade law and taking a critical view of the U.S. role in international economic cooperation. Given U.S.-EU historical joint leadership on global trade and economic issues, these developments could have implications for the rules-based international trading system, a foundation of the global economic order that has contributed to global economic growth and stability in the post-World War II era.
Date:
July 20, 2018
Creator:
Akhtar, Shayerah Ilias
Object Type:
Report
System:
The UNT Digital Library
U.S.-EU Trade and Investment Ties: Magnitude and Scope
This report provides background information and analysis on the trade and investment relationship between the United States and the European Union. It also discusses the EU economy and issues for Congress.
Date:
July 20, 2018
Creator:
Akhtar, Shayerah Ilias
Object Type:
Report
System:
The UNT Digital Library
Inclusive Jet Production at CDF
The inclusive jet cross section was measured by CDF at center of mass energies of 1800 and 630 GeV. At {radical}s =1800 GeV, the inclusive jet cross section is compared with NLO QCD predictions (with different sets of parton distribution functions) and with measurement by D0 Collaboration. Strong coupling constant is extracted (as a consistency check) from 1800 GeV inclusive jet data. The ratio of scaled inclusive jet cross sections measured at two values of {radical}s is compared with NLO QCD predictions. Comparison with D0 result is also shown.
Date:
July 20, 1999
Creator:
Akopian, A.
Object Type:
Article
System:
The UNT Digital Library
Investigation of Oxidative Degradation in Polymers Using (17)O NMR Spectroscopy
The thermal oxidation of pentacontane (C{sub 50}H{sub 102}), and of the homopolymer polyisoprene, has been investigated using {sup 17}O NMR spectroscopy. By performing the oxidation using {sup 17}O labeled O{sub 2} gas, it is possible to easily identify degradation products, even at relatively low concentrations. It is demonstrated that details of the degradation mechanism can be obtained from analysis of the {sup 17}O NMR spectra as a function of total oxidation. Pentacontane reveals the widest variety of reaction products, and exhibits changes in the relative product distributions with increasing O{sub 2} consumption. At low levels of oxygen incorporation, peroxides are the major oxidation product, while at later stages of degradation these species are replaced by increasing concentrations of ketones, alcohols, carboxylic acids and esters. Analyzing the product distribution can help in identification of the different free-radical decomposition pathways of hydroperoxides, including recombination, proton abstraction and chain scission, as well as secondary reactions. The {sup 17}O NMR spectra of thermally oxidized polyisoprene reveal fewer degradation functionalities, but exhibit an increased complexity in the type of observed degradation species due to structural features such as unsaturation and methyl branching. Alcohols and ethers formed from hydrogen abstraction and free radical termination.
Date:
July 20, 1999
Creator:
Alam, Todd M.; Celina, Mathew; Assink, Roger A.; Clough, Roger L.; Gillen, Kenneth T. & R., Wheeler David
Object Type:
Article
System:
The UNT Digital Library
Carney Enterprise (Carney, Okla.), Vol. 16, No. 52, Ed. 1 Friday, July 20, 1917
Weekly newspaper from Carney, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 20, 1917
Creator:
Albert, H. R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History