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Oklahoma Historical Society
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Texas State Library and Archives Commission
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UNT Libraries Government Documents Department
30
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29
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24
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18
Arkansas State Archives
6
National Museum of the Pacific War/Admiral Nimitz Foundation
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159
Tocker Foundation Grant
60
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49
Texas State Library and Archives Commission Newspapers Collection
32
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29
José L. Castillo Photograph Collection
16
Office of Scientific & Technical Information Technical Reports
14
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8
Altus Times-Democrat
8
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The Fayette County Record (La Grange, Tex.), Vol. 33, No. 68, Ed. 1 Friday, June 24, 1955
Semi-weekly newspaper from La Grange, Texas that includes local, state, and national news along with extensive advertising.
Date:
June 24, 1955
Creator:
Sulak, John L.
Object Type:
Newspaper
System:
The Portal to Texas History
[Proclamation from Francisco Vidaurri y Villaseñor - June 24, 1834]
Decree from the Government (Gobierno Supremo) of the State of Coahuila and Texas. Discusses the extra sessions of the State Congress, comments on the federal system and religion, and plans for discussing public finances. There are also lines written in script at the bottom and signed by J. Maria Cantu.
Date:
June 24, 1834
Creator:
Supreme Government of the free State of Coahuila and Texas
Object Type:
Text
System:
The Portal to Texas History
Svoboda. (La Grange, Tex.), Vol. 1, No. 27, Ed. 1 Thursday, June 24, 1886
Weekly Czech-language newspaper from La Grange, Texas that includes local, state, and national news along with advertising.
Date:
June 24, 1886
Creator:
Chudoba, Jaroslav
Object Type:
Newspaper
System:
The Portal to Texas History
The La Grange Journal (La Grange, Tex.), Vol. 86, No. 25, Ed. 1 Thursday, June 24, 1965
Weekly newspaper from La Grange, Texas that includes local, state, and national news along with extensive advertising.
Date:
June 24, 1965
Creator:
Zapalac, Lester
Object Type:
Newspaper
System:
The Portal to Texas History
Svoboda. (La Grange, Tex.), Vol. 12, No. 24, Ed. 1 Thursday, June 24, 1897
Weekly Czech-language newspaper from La Grange, Texas that includes local, state, and national news along with advertising.
Date:
June 24, 1897
Creator:
Haidusek, A.
Object Type:
Newspaper
System:
The Portal to Texas History
La Grange Deutsche Zeitung (La Grange, Tex.), Vol. 30, No. 45, Ed. 1 Thursday, June 24, 1920
Weekly German-language newspaper from La Grange, Texas that includes local, state, and national news along with advertising.
Date:
June 24, 1920
Creator:
Haeusler, George
Object Type:
Newspaper
System:
The Portal to Texas History
La Grange Deutsche Zeitung. (La Grange, Tex.), Vol. 19, No. 45, Ed. 1 Thursday, June 24, 1909
Weekly German-language newspaper from La Grange, Texas that includes local, state, and national news along with advertising.
Date:
June 24, 1909
Creator:
Heilig, G. A.
Object Type:
Newspaper
System:
The Portal to Texas History
The La Grange Journal (La Grange, Tex.), Vol. 69, No. 26, Ed. 1 Thursday, June 24, 1948
Weekly newspaper from La Grange, Texas that includes local, state, and national news along with extensive advertising.
Date:
June 24, 1948
Creator:
Priebe, Charles W.
Object Type:
Newspaper
System:
The Portal to Texas History
[Man speaking at podium with right hand raised]
NALEO is the National Association of Latino Elected and Appointed Officials.
Date:
June 24, 2006
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
Oral History Interview with Paul Voertman, June 24, 1977
Interview with Paul Voertman concerning his expriences as President of Voertman's Book Store in Denton, Texas. He discusses the founding of Voertman's by his father in 1925, the early years of the store, the Depression, the opening of a store near Texas Women's University, and the effects upon his business from North Texas State University opening its own book store. He also shares his thoughts on education, his early work experience, the growth in merchandise lines, and the problems of the book business.
Date:
June 24, 1977
Creator:
Jenkins, Floyd Harold & Voertman, Paul, 1929-
Object Type:
Book
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning. Second quarterly progress report, December 1, 1989--February 28, 1990
To better understand the surface chemical properties of coal and mineral pyrite, studies on the effect of flotation surfactants (frother and kerosene) on the degree of hydrophobicity have been conducted. The presence of either frother or kerosene enhanced the flotability of coal and mineral pyrite with a corresponding decrease in induction time over the pH range examined. Scanning electron microscopy (SEM) results indicate a correlation exists between the sample surface morphology and crystal structure and the observed hydrophobicity. As a result of the data obtained from the surface characterization studies, controlled surface oxidation was investigated as a possible pyrite rejection scheme in microbubble column flotation.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. & Lagno, M.
Object Type:
Report
System:
The UNT Digital Library
The Reconnaissance (Camp Bowie, Tex.), Vol. 1, No. 43, Ed. 1 Monday, June 24, 1918
Weekly newspaper from Camp Bowie in Fort Worth, Texas that includes news of interest to camp personnel along with advertising.
Date:
June 24, 1918
Creator:
Watson, Kent
Object Type:
Newspaper
System:
The Portal to Texas History
Control of pyrite surface chemistry in physical coal cleaning. Seventh quarterly progress report, March 1, 1991--May 31, 1991
The removal of pyrite from coal by flotation or any other surface chemistry based separation process is often hampered by the apparent hydrophobicity of the mineral. Results obtained in this project suggest that corrosion processes are responsible for the apparent hydrophobicity of pyrite in aqueous environments. Characterization of the corrosion products of pyrite in acidic and alkaline solution has been performed using electrochemical (cyclic voltammetry and single-potential-step chronoamperometry) and spectroscopic techniques (X-ray photoelectron spectroscopy -- XPS). The nature of the surface products have been correlated with hydrophobicity determined from in-situ contact angle measurements. The results show that pyrite hydrophobicity is influenced by either the oxidation or reduction conditions of the system.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H. & Zachwieja, J. B.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning
The removal of pyrite from coal by flotation or any other surface chemistry based separation process is often hampered by the apparent hydrophobicity of the mineral. Results obtained in this project suggest that corrosion processes are responsible for the apparent hydrophobicity of pyrite in aqueous environments. Characterization of the corrosion products of pyrite in acidic and alkaline solution has been performed using electrochemical (cyclic voltammetry and single-potential-step chronoamperometry) and spectroscopic techniques (X-ray photoelectron spectroscopy -- XPS). The nature of the surface products have been correlated with hydrophobicity determined from in-situ contact angle measurements. The results show that pyrite hydrophobicity is influenced by either the oxidation or reduction conditions of the system.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H. & Zachwieja, J. B.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning
The successful separation of pyrite from coal by flotation is dependent to a large extent upon the selectivity of the process, and the use of a pyrite depressant is one of the most important and cost-effective techniques for achieving this. This report evaluates the effects of three factors on the floatability of pyrite. These are (1) the superficial oxidation of pyrite, (2) the contamination of pyrite surfaces by carbonaceous matter, and (3) pulp redox potentials. XPS (x-ray photoelectron spectroscopy) and IR spectrometry have been used to identify surface reaction products. Microflotation, laboratory-scale conventional flotation and microbubble column flotation were used to quantify the effects of these factors. It was found that low (reducing) pulp potentials are effective depressants of pyrite (more so for fresh, unoxidized samples than for oxidized samples), whilst at the same time do not materially affect coal flotation.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H. & Ou, Z. S.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning
To better understand the surface chemical properties of coal and mineral pyrite, studies on the effect of flotation surfactants (frother and kerosene) on the degree of hydrophobicity have been conducted. The presence of either frother or kerosene enhanced the flotability of coal and mineral pyrite with a corresponding decrease in induction time over the pH range examined. Scanning electron microscopy (SEM) results indicate a correlation exists between the sample surface morphology and crystal structure and the observed hydrophobicity. As a result of the data obtained from the surface characterization studies, controlled surface oxidation was investigated as a possible pyrite rejection scheme in microbubble column flotation.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. & Lagno, M.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning
One of the most difficult separations in minerals processing involves the differential flotation of pyrite and coal. Under practical flotation conditions, they are both hydrophobic and no cost-effective method has been developed to efficiently reject the pyrite. The problem arises from inherent floatability of coal and pyrite. Coal is naturally hydrophobic and remains so under practical flotation. Although pyrite is believed to be naturally hydrophilic under practical flotation conditions it undergoes a relatively rapid incipient oxidation reaction that causes self-induced'' flotation. The oxidation product responsible for self-induced'' flotation is believed to be a metal polysulfide, excess sulfur in the lattice, or in some cases elemental sulfur. It is believed that if incipient oxidation of pyrite could be prevented, good pyrite rejection could be obtained. In order to gain a better understanding of how pyrite oxidizes, a new method of preparing fresh, unoxidized pyrite surfaces and a new method of studying pyrite oxidation have been developed this reporting period.
Date:
June 24, 1992
Creator:
Yoon, R. H. & Richardson, P. R.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning. Tenth quarterly progress report, December 1, 1991--February 29, 1992
One of the most difficult separations in minerals processing involves the differential flotation of pyrite and coal. Under practical flotation conditions, they are both hydrophobic and no cost-effective method has been developed to efficiently reject the pyrite. The problem arises from inherent floatability of coal and pyrite. Coal is naturally hydrophobic and remains so under practical flotation. Although pyrite is believed to be naturally hydrophilic under practical flotation conditions it undergoes a relatively rapid incipient oxidation reaction that causes ``self-induced`` flotation. The oxidation product responsible for ``self-induced`` flotation is believed to be a metal polysulfide, excess sulfur in the lattice, or in some cases elemental sulfur. It is believed that if incipient oxidation of pyrite could be prevented, good pyrite rejection could be obtained. In order to gain a better understanding of how pyrite oxidizes, a new method of preparing fresh, unoxidized pyrite surfaces and a new method of studying pyrite oxidation have been developed this reporting period.
Date:
June 24, 1992
Creator:
Yoon, R. H. & Richardson, P. R.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning. Fifth quarterly progress report, September 1, 1990--November 30, 1990
The successful separation of pyrite from coal by flotation is dependent to a large extent upon the selectivity of the process, and the use of a pyrite depressant is one of the most important and cost-effective techniques for achieving this. This report evaluates the effects of three factors on the floatability of pyrite. These are (1) the superficial oxidation of pyrite, (2) the contamination of pyrite surfaces by carbonaceous matter, and (3) pulp redox potentials. XPS (x-ray photoelectron spectroscopy) and IR spectrometry have been used to identify surface reaction products. Microflotation, laboratory-scale conventional flotation and microbubble column flotation were used to quantify the effects of these factors. It was found that low (reducing) pulp potentials are effective depressants of pyrite (more so for fresh, unoxidized samples than for oxidized samples), whilst at the same time do not materially affect coal flotation.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H. & Ou, Z. S.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning. Third quarterly progress report, March 1, 1990--May 31, 1990
Correlation of the hydrophobicity measurements of coal and mineral pyrite with changes in the surface composition of the samples as determined by x-ray photoelectron spectroscopy (XPS) reveals that similar surface oxidation products are found on both mineral and coal pyrite samples. The surface oxidation layer of these samples is comprised of different amounts of hydrophilic species (iron hydroxy-oxides and/or iron oxides) and hydrophobic species (polysulfide or elemental sulfur). The resulting hydrophobicity of these samples may be attributed to the ratio of hydrophilic (surface oxides) to hydrophobic (sulfur-containing) species in the surface oxidation layer. Also, coal pyrite samples were found to exhibit a greater degree of superficial oxidation and a less hydrophobic character as compared to the mineral pyrite samples.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. B. & Lagno, M. L.
Object Type:
Report
System:
The UNT Digital Library
Control of pyrite surface chemistry in physical coal cleaning
Correlation of the hydrophobicity measurements of coal and mineral pyrite with changes in the surface composition of the samples as determined by x-ray photoelectron spectroscopy (XPS) reveals that similar surface oxidation products are found on both mineral and coal pyrite samples. The surface oxidation layer of these samples is comprised of different amounts of hydrophilic species (iron hydroxy-oxides and/or iron oxides) and hydrophobic species (polysulfide or elemental sulfur). The resulting hydrophobicity of these samples may be attributed to the ratio of hydrophilic (surface oxides) to hydrophobic (sulfur-containing) species in the surface oxidation layer. Also, coal pyrite samples were found to exhibit a greater degree of superficial oxidation and a less hydrophobic character as compared to the mineral pyrite samples.
Date:
June 24, 1992
Creator:
Luttrell, G. H.; Yoon, R. H.; Zachwieja, J. B. & Lagno, M. L.
Object Type:
Report
System:
The UNT Digital Library
[Office of Hanford Directed Operations events of importance for week ending June 22, 1949]
This report details events of importance reported by Hanford Operations Office for the week ending June 22, 1949.
Date:
June 24, 1949
Creator:
Shaw, D. F.
Object Type:
Report
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 118, No. 3, Ed. 1 Thursday, June 24, 1993
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
June 24, 1993
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
Moving the End of Term Web Archive to the Cloud to Encourage Research Use and Reuse
Presentation given at the 2022 Web Archiving and Digital Libraries Virtual Workshop, in conjunction with the Joint Conference on Digital Libraries (JCDL), on June 24, 2022. This presentation discusses the End of Term (EOT) Web Archive project and process of organizing, staging, processing, and moving these collections into the Amazon cloud.
Date:
June 24, 2022
Creator:
Phillips, Mark Edward & Alam, Sawood
Object Type:
Presentation
System:
The UNT Digital Library