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3,112 Matching Results
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Brine chemistry: scaling and corrosion. Geothermal research study in the Salton Sea region of California
The purpose of this report is to recommend a reasonable program of brine chemistry research that will result in the development of methods for predicting and controlling scale deposition, and in guidelines for the selection of corrosion-resistant construction materials. First, background information, which is necessary for the understanding of the problems of scaling and corrosion in the Salton Sea KGRA, is presented through a review of the history of geothermal exploration and development in the Salton Sea. Second, literature relevant to the geochemistry of the Salton Sea field is reviewed and important results are emphasized. Third, current research efforts directed toward actual power plant construction are summarized and evaluated. Fourth, research which has been proposed but is not currently funded is discussed. Fifth, because silica scaling has been the most troublesome problem in the past, the basic chemistry of silica and its relationship to scaling is discussed. Sixth, recommendations for future research are made in which a fundamental engineering approach is emphasized. In this approach, experiments would be conducted on actual process equipment and detailed chemical analyses would be performed on site in well-equipped field laboratories. 88 references.
Date:
July 1, 1975
Creator:
Hoffmann, Michael R.
Object Type:
Report
System:
The UNT Digital Library
Effects of grit roughness and pitch oscillations on the NACA 4415 airfoil
A NACA 4415 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory 3 x 5 subsonic wind tunnel under steady state and unsteady conditions. The test defined baseline conditions for steady state angles of attack from {minus}10{degree} to +40{degree} and examined unsteady behavior by oscillating the model about its pitch axis for three mean angles, three frequencies, and two amplitudes. For all cases, Reynolds numbers of 0.75, 1, 1.25, and 1.5 million were used. In addition, these were repeated after the application of leading edge grit roughness (LEGR) to determine contamination effects on the airfoil performance. Steady state results of the NACA 4415 testing at Reynolds number of 1.25 million showed a baseline maximum lift coefficient of 1.30 at 12.3{degree} angle of attack. The application of LEGR reduced the maximum lift coefficient by 20% and increased the 0.0090 minimum drag coefficient value by 62%. The zero lift pitching moment of {minus}0.0967 showed a 13% reduction in magnitude to {minus}0.0842 with LEGR applied. Data were also obtained for two pitch oscillation amplitudes: {+-}5.5{degree} and {+-}10{degree}. The larger amplitude consistently gave a higher maximum lift coefficient than the smaller amplitude, and both unsteady maximum lift coefficients were …
Date:
July 1, 1996
Creator:
Hoffmann, M. J.; Reuss Ramsay, R. & Gregorek, G. M.
Object Type:
Report
System:
The UNT Digital Library
Effects of grit roughness and pitch oscillations on the S814 airfoil
Horizontal-axis wind turbine rotors experience unsteady aerodynamics when the rotor is yawed, when rotor blades pass through the support tower wake, and when the wind is gusting. An understanding of this unsteady behavior is necessary to assist in the design of new rotor airfoils. The rotors also experience performance degradation due to surface roughness. These surface irregularities are due to the accumulation of insect debris, ice, and/or the aging process. Wind tunnel studies that examine both the steady and unsteady behavior of airfoils can help define pertinent flow phenomena, and the resultant data can also be used to validate analytical computer codes. An S814 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 3 X 5 subsonic wind tunnel (3 X 5) under steady flow with both stationary model conditions and pitch oscillations. To study the extent of performance loss due to surface roughness, a leading edge grit roughness pattern (LEGR) was used to simulate leading edge contamination. After baseline cases were completed, the LEGR was applied for both steady state and model pitch oscillation cases. The Reynolds numbers for steady state conditions were 0.75, 1, 1.25 and 1.5 million, while the angle of …
Date:
July 1, 1996
Creator:
Janiszewska, J. M.; Ramsay, R. Reuss; Hoffmann, M. J. & Gregorek, G. M.
Object Type:
Report
System:
The UNT Digital Library
Uranium effluent testing for the Oak Ridge Toxic Substances Control Act mixed waste incinerator
The Oak Ridge K-25 Site Toxic Substances Control Act (TSCA) Incinerator has been undergoing a series of routine tests to determine uranium partitioning to the stack, scrubber waters, and bottom ash. This paper discusses the results of the most recent experiment in which relatively high rates of uranium stack gas emissions were identified: 6.11 g/h or 8 wt % based on the uranium feed. These data are compared with earlier data, and an empirical correlation is suggested between the stack emissions of uranium and the product of the uranium and chlorine concentration of the feed. This is consistent with certain findings with other metals, in which increasing chlorine feed contents led to increasing emissions.
Date:
July 1, 1993
Creator:
Shor, J. T.; Bostick, W. D.; Hoffmann, D. P.; Gibson, L. V. Jr. & Ho, T. C.
Object Type:
Article
System:
The UNT Digital Library
{sup 199}Hg and {sup 63,65}Cu NMR studies of mercury based high-Tc superconductors
Hg-oxide ceramic high temperature superconductors were studied with {sup 199}Hg- and {sup 63,65}Cu- NMR spectroscopy. Room temperature spectra, spin-spin and spin-lattice relaxation times of samples with different superconducting transition temperatures are presented. A spin-lattice relaxation time of T{sub 1} = 35 msec and a spin-spin relaxation time of T{sub 2} = 1.6 msec is found for the 199 Hg-NMR. All samples exhibit similar characteristic powder spectra caused by an axially symmetric {sup 199}Hg spin interaction. The isotropic value and the anisotropy of the tensor relative to solid HgCl{sub 2} as a standard substance is estimated. Furthermore results of {sup 63,65}Cu NMR at a temperature of 4.2 K are presented. Also this signal shows a powder line shape (for I = 3/2).
Date:
July 1, 1994
Creator:
Hoffmann, W.; Breitzke, H.; Simmons, C. T.; Lueders, K.; Buntkowsky, G.; Limbach, H. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Doctoral Recital: 2021-07-17 – Xiaoyue Liu, soprano
Recital presented in Shenzhen, China in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
July 17, 2021
Creator:
Liu, Xiaoyue (Singer)
Object Type:
Video
System:
The UNT Digital Library
Transverse momentum and centrality dependence of high-ptnon-photonic electron suppression in Au+Au collisions at $\sqrt{s_{NN}}$= 200 GeV
The STAR collaboration at RHIC reports measurements of theinclusive yield of non-photonic electrons, which arise dominantly fromsemi-leptonic decays of heavy flavor mesons, over a broad range oftransverse momenta (1.2<pt<10 gevc) in pp, dAu, and AuAucollisions at sqrt sNN = 200 GeV. The non-photonic electron yieldexhibits unexpectedly large suppression in central AuAu collisions athigh pt, suggesting substantial heavy quark energy loss at RHIC. Thecentrality and \pt dependences of the suppression provide constraints ontheoretical models of suppression.
Date:
July 11, 2006
Creator:
Abelev, B. I.; Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Pion-Kaon correlations in central Au+Au collisions at {radical}(s{sub NN}) = 130 GeV
No abstract prepared.
Date:
July 31, 2003
Creator:
Adams, J.; Adler, C.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Multi-strange baryon production in Au-Au collisions at sqrt(sNN) = 130 GeV
The transverse mass spectra and mid-rapidity yields for {Xi}s and {Omega}s plus their anti-particles are presented. The 10% most central collision yields suggest that the amount of multi-strange particles produced per produced charged hadron increases from SPS to RHIC energies. A hydrodynamically inspired model fit to the spectra, which assumes a thermalized source, seems to indicate that these multi-strange particles experience a significant transverse flow effect, but are emitted when the system is hotter and the flow is smaller than values obtained from a combined fit to {pi}, K, p and {Lambda}s.
Date:
July 31, 2003
Creator:
Adams, J.; Adler, C.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200GeV
We present strange particle spectra and yields measured atmid-rapidity in sqrt text s=200 GeV proton-proton (p+p) collisions atRHIC. We find that the previously observed universal transverse mass(mathrm mT \equiv\sqrt mathrm p_T 2+\mathrm m2) scaling of hadronproduction in p+p collisions seems to break down at higher \mt and thatthere is a difference in the shape of the \mt spectrum between baryonsand mesons. We observe mid-rapidity anti-baryon to baryon ratios nearunity for Lambda and Xi baryons and no dependence of the ratio ontransverse momentum, indicating that our data do not yet reach thequark-jet dominated region. We show the dependence of the mean transversemomentum (\mpt) on measured charged particle multiplicity and on particlemass and infer that these trends are consistent with gluon-jet dominatedparticle production. The data are compared to previous measurements fromCERN-SPS, ISR and FNAL experiments and to Leading Order (LO) and Next toLeading order (NLO) string fragmentation model predictions. We infer fromthese comparisons that the spectral shapes and particle yields from $p+p$collisions at RHIC energies have large contributions from gluon jetsrather than quark jets.
Date:
July 31, 2006
Creator:
Abelev, B. I.; Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Multi-strange baryon production in Au+Au collisions at {radical}s{sub NN} = 130 GeV
The transverse mass spectra and mid-rapidity yields for {Xi}s and {Omega}s plus their anti-particles are presented. The 10% most central collision yields suggest that the amount of multi-strange particles produced per produced charged hadron increases from SPS to RHIC energies. A hydrodynamically inspired model fit to the spectra, which assumes a thermalized source, seems to indicate that these multi-strange particles experience a significant transverse flow effect, but are emitted when the system is hotter and the flow is smaller than values obtained from a combined fit to {pi}, K, p and {lambda}s.
Date:
July 30, 2003
Creator:
Adams, J.; Adler, C.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurements of Transverse Energy Distributions in Au+Au Collisions at {radical}s{sub NN} = 200 GeV
Transverse energy (E{sub T}) distributions have been measured for Au+Au collisions at {radical}s{sub NN} = 200 GeV by the STAR collaboration at RHIC. E{sub T} is constructed from its hadronic and electromagnetic components, which have been measured separately. E{sub T} production for the most central collisions is well described by several theoretical models whose common feature is large energy density achieved early in the fireball evolution. The magnitude and centrality dependence of E{sub T} per charged particle agrees well with measurements at lower collision energy, indicating that the growth in E{sub T} for larger collision energy results from the growth in particle production. The electromagnetic fraction of the total E{sub T} is consistent with a final state dominated by mesons and independent of centrality.
Date:
July 2, 2004
Creator:
Adams, J.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D.; Arkhipkin, D. et al.
Object Type:
Article
System:
The UNT Digital Library
The North Texas Daily (Denton, Tex.), Vol. 55, No. 116, Ed. 1 Thursday, July 6, 1972
Daily student newspaper from North Texas State University in Denton, Texas that includes local, state, and campus news along with advertising. Formerly The Campus Chat.
Date:
July 6, 1972
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 165, Ed. 1 Sunday, July 14, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 14, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 171, Ed. 1 Sunday, July 21, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 21, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 172, Ed. 1 Tuesday, July 23, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 23, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 176, Ed. 1 Saturday, July 27, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 27, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 166, Ed. 1 Tuesday, July 16, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 16, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Nuclear structure studies at intermediate energies
This report discusses the following topics: Search for dibaryon resonances; analysis of {sup 208}Pb({pi}{sup {plus minus}},{pi}{sup {plus minus}}) data; analysis of {sup 206,207,208}Pb(p,p{prime}) data; study of transition nuclei by (p,p{prime}); search for recoil free {delta}-production; search for low lying magnetic states; proton nucleus scattering and swelling of nucleons; measurement of spin observables in {sup 28}Si(p,p{prime}); strength of tensor force in nuclei; global analysis of (p,p{prime}) reactions to high spin states in {sup 28}Si and {sup 58}Ni and density dependent modifications; MRS Setup and development; and development of coincidence studies with the MRS.
Date:
July 1, 1990
Creator:
Hintz, Norton M.
Object Type:
Report
System:
The UNT Digital Library
Toward a More Rational Design of the Direct Synthesis of Aniline: A Density Functional Theory Study
This article uses plane-wave density functional theory calculations to investigate the direct amination of benzene catalyzed by a Ni(111) surface to explore the reaction intermediates and to understand the role of nickel in this reaction.
Date:
March 24, 2017
Creator:
Alsunaidi, Zainab H. A.; Cundari, Thomas R., 1964- & Wilson, Angela K.
Object Type:
Article
System:
The UNT Digital Library
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 173, Ed. 1 Wednesday, July 24, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 24, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Brenham Daily Banner. (Brenham, Tex.), Vol. 26, No. 168, Ed. 1 Thursday, July 18, 1901
Daily newspaper from Brenham, Texas that includes local, state and national news along with extensive advertising.
Date:
July 18, 1901
Creator:
Rankin, John G.
Object Type:
Newspaper
System:
The Portal to Texas History
Nuclear structure studies at intermediate energies. Summary progress report, 1987--1990
This report discusses the following topics: Search for dibaryon resonances; analysis of {sup 208}Pb({pi}{sup {plus_minus}},{pi}{sup {plus_minus}}) data; analysis of {sup 206,207,208}Pb(p,p{prime}) data; study of transition nuclei by (p,p{prime}); search for recoil free {delta}-production; search for low lying magnetic states; proton nucleus scattering and swelling of nucleons; measurement of spin observables in {sup 28}Si(p,p{prime}); strength of tensor force in nuclei; global analysis of (p,p{prime}) reactions to high spin states in {sup 28}Si and {sup 58}Ni and density dependent modifications; MRS Setup and development; and development of coincidence studies with the MRS.
Date:
July 1, 1990
Creator:
Hintz, N. M.
Object Type:
Report
System:
The UNT Digital Library
Dynamics of hadron-nucleus interactions
Recent progress in diffraction theory shows that proton-nucleus scattering at nonforward angles is dominated by the interference of waves from two or more bright spots. Analytic formulas based on asymptotic theories of diffraction yield valuable new insights into the scattering and these formulas can be readily extended to illuminate the role of dynamical ingredients, i.e., the nucleon-nucleon amplitudes. The governing parameters of the diffraction and some direct connections between the observed cross sections and the input dynamics are reviewed. New information regarding the nucleon-nucleon parameters based on recent phase shift analyses show some systematic differences from the effective NN amplitudes which produce fits to proton-nucleus diffraction data. Recent progress in understanding the role of ..delta..-isobars in proton-nucleus dynamics is reviewed. 126 references.
Date:
July 1, 1981
Creator:
Wallace, S.J.
Object Type:
Article
System:
The UNT Digital Library