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5,263 Matching Results

Start Over Decade 1990-1999 Day 24th

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Results: 1 - 24 of 5,263 next

(open access)

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

(open access)

[Letter from Bill McCarter to Jan Schronk, August 24, 1990]

Photocopy of a letter from Bill McCarter, co-director of North Texas Institute for Educators on the Visual Arts, to Jan Schronk, Art Supervisor of Hurst-Euless-Bedford ISD. Hoping the presentation that Schronk attended, fulfilled basic expectations she had in terms of understanding DBAE better, and that the art specialists who participated in the workshop have a better understanding of NTIEVA's goals for the HEB district.

Date: August 24, 1990

Creator: McCarter, William

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Rick Stewart to Colleagues, August 24, 1995]

Photocopy of a letter from Rick Stewart, Acting Director and Chief Curator of the Amon Carter Museum, to his colleagues. In regards to the send-off party for Allison Perkins, Education Director of the Amon Carter. The event is to be held, September 11, 1995 at the Amon Carter Museum Library from 3:30 pm to 5:00 pm.

Date: August 24, 1995

Creator: Stewart, Rick

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Bill McCarter to Nicole Murphy Holland, August 24, 1990]

Photocopy of a letter from Bill McCarter, co-director of North Texas Institute for Educators on the Visual Arts, to Nicole Murphy Holland, Vice President for Exhibitions InterCultura. In regards of McCarter's enthusiasm for the presentation regarding "The Wanderers," and mentions David Coffey doing a superb job amplifying the content written by Andrew Harris. McCarter says that it is imperative that art teachers at both an elementary and secondary level be exposed to excellent presentations and that Georgia Blades is working with the program for Texas Art Education Fall Meeting in Fort Worth, hoping that Holland and Blades could connect for a repeat presentation to the members of TAEA. Enclosed in the letter to Holland, McCarter has sent a newsletter of the National Art Education Association, for Holland to get a feeling of strength from the teacher organization. Newsletter not present with letter.

Date: August 24, 1990

Creator: McCarter, William

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Bill McCarter to Peggy Mitchell, August 24, 1990]

Photocopy of a letter from Bill McCarter, co-director of North Texas Institute for Educators on the Visual Arts, to Peggy Mitchell, teacher at Bedford Heights Elementary. McCarter writes that Mitchell's participation in the workshop for Art Teachers from Hurst-Euless-Bedford ISD was very appreciated and that Mitchell brings a special insight into the problems NTIEVA faces. McCarter writes that Mitchell and Sonja Starnes should be able to build a DBAE program for the schools.

Date: August 24, 1990

Creator: McCarter, William

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Leilani Lattin Duke to Bill McCarter, August 24, 1993]

Photocopy of a letter from Leilani Lattin Duke, director of the Getty Center, to Bill McCarter, requesting McCarter's assistance in responding to the draft of the National Arts Standards. Duke expresses some concern with the content of the National Arts Standards draft and promises McCarter if he could give written feedback no later than October 1st, the Center will pay him.

Date: August 24, 1993

Creator: Duke, Leilani Lattin

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Bill McCarter to Sonja Starnes, August 24, 1990]

Photocopy of a letter from Bill McCarter, co-director of North Texas Institute for Educators on the Visual Arts, to Sonja Starnes, Art Teacher at Bedford Heights Elementary. In regards to Starnes's participation in the workshop for elementary art teaches at Hurst-Euless-Bedford ISD. Starnes's leadership was insightful for the other faculty about the implementation of DBAE, discipline-based arts education, in HEB schools and McCarter is looking forward to working with her.

Date: August 24, 1990

Creator: McCarter, William

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter from Jack Davis to Mitch Jericho, October 24, 1995]

Photocopy of a letter from Jack Davis, Dean of the School of Visual Arts at the University of North Texas, to Mitch Jericho. In regards to Jeff Patchen speaking at the Young Audiences conference in Dallas. Davis and his NTIEVA co-director Bill McCarter have discussed bringing Patchen to the University of North Texas, however, there is no justifiable reason to bring him to the School of Visual Arts since Patch is a musician. Davis is planning on sharing Jericho's letter to the David Sharder, Dean of the College of Music as he might have an interested in Patchen speaking with the music faculty.

Date: October 24, 1995

Creator: Davis, Donald Jack

Object Type: Letter

System: The UNT Digital Library

(open access)

Scale effects in sliding friction: An experimental study

Solid friction is considered by some to be a fundamental property of two contacting materials, while others consider it to be a property of the larger tribosystem in which the materials are contained. A set of sliding friction experiments were designed to investigate the hypothesis that the unlubricated sliding friction between two materials is indeed a tribosystems-related property and that the relative influence of the materials properties or those of the machine on friction varies from one situation to another. Three tribometers were used: a friction microprobe (FMP), a typical laboratory-scale reciprocating pin-on-flat device, and a heavy-duty commercial wear tester. The slider material was stainless steel (AISI 440C) and the flat specimen material was an ordered alloy of Ni{sub 3}Al (IC-50). Sphere-on-flat geometry was used at ambient conditions and at normal forces ranging from 0.01 N to 100 N and average sliding velocities of 0.01 to 100.0 mm/s. The nominal, steady-state sliding friction coefficient tended to decrease with increases in normal force for each of the three tribometers, and the steady state value of sliding friction tended to increase as the mass of the machine increased. The variation of the friction force during sliding was also a characteristic of the …

Date: July 24, 1991

Creator: Blau, P.J.

Object Type: Article

System: The UNT Digital Library

(open access)

Seismic analysis of reactor exhaust air filter compartment

The Filter Compartment (FC) in this analysis is a generic reactor airborne activity confinement filter compartment which possesses all the essential physical and mechanical properties of the Savannah River Site (SRS) confinement filters of Reactor Buildings K, L, and P. The filters belong to the Airborne Activity Confinement System (AACS). These filters absorb a significant amount of radioactive effluents from the exhausting air. The seismic excitation is input indirectly from the output of the seismic analysis of the 105 exhaust stack building in the form of floor response spectra. However, the 105 exhaust stack building was analyzed for seismic motions defined by free-field ground response spectra with a ZPA (Zero Period Acceleration) of 0.2G for all three orthogonal components of ground motion and a shape consistent with USNRC Regulatory Guide 1.60. Based upon equivalent dynamic analysis of the FC, DuPont engineers suggested modifications on the existing FC with heavy I-section beams (1). The scope of this phase I'' analysis, as requested by Seismic Engineering (2), is to carry out a scoping analysis'' of Frequency Analysis and Response Spectrum Analysis of the FC with DuPont suggested conceptual modifications. Our suggestion was that the existing FC without conceptual modifications be analyzed first. …

Date: September 24, 1990

Creator: Gong, Chung; Funderburk, E.L. & Jerrell, J.W.

Object Type: Report

System: The UNT Digital Library

(open access)

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

(open access)

A first simulation study of the barrel-endcap transition region in a calorimeter of the scintillator tile design

We have made a first study of the calorimetric response to 10 GeV/c charged pions in the transition region between barrel and endcap for the scintillator-tile design pursued at Argonne National Laboratory using the simulation program ANLSIM. For (very nearly) projective tower orientations in the barrel, the crack appears deep within a narrow angular range, causing a loss of the response in that region up to 40%. Pointing the towers onto the beam axis 35 cm or more away from the nominal-interaction point leads to a shortened depth of the barrel-endcap crack as seen by particles incident from the interaction region, cutting the maximum loss down by almost one half. The worsening of the resolution follows the same trend. Introduction of a solenoidal coil in front of the calorimeter causes an overall degradation of the response by an amount nearly comparable to the effect of the crack. Electrons of the same incident momentum are more strongly affected by the coil than pions but see only a much narrower region of degradation by the crack. 15 refs., 6 figs., 2 tabs.

Date: August 24, 1990

Creator: Proudfoot, J. & Trost, H. J.

Object Type: Report

System: The UNT Digital Library

(open access)

Establishment and maintenance of a coal sample bank and data base

In the project status report for 4/9/90--7/8/90, Table 2 presented update results of a comparative study of coal sample deterioration in several container types including foil laminate bags. This table contained an erroneous entry (foil laminate bag {minus}20 mesh, alkali extraction 65.4% transmittance). The alkali extraction test on {minus}20 mesh coal stored in foil laminate bags for 52 weeks was repeated in duplicate on another bag (after 64 weeks total storage) resulting in a measurement of 96.2% transmittance. This value has been substituted for the erroneous 65.4% value in the corrected copy of Table 2 enclosed with this report. All values of the alkali extraction and Gieseler fluidity tests indicate that the state of preservation of sample in foil laminate bags is excellent. The samples stored by other methods for comparison purposes all showed significant loss in fluid characteristics. One new whole-seam channel sample of the hvAb Pittsburgh seam coal, DECS-12, was collected July 25, 1990 in Greene County, PA. This sample was placed in 30-gallon steel barrels with high-density lid gaskets and purged with argon at the mine. Upon return to Penn State it was promptly processed so that Gieseler fluidity and other routine analyses could be performed.

Date: October 24, 1990

Creator: Davis, A.

Object Type: Report

System: The UNT Digital Library

captions transcript

[News Clip: Forest Hill]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: July 24, 1994, 10:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Webber]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: December 24, 1993, 5:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Talk radio]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: January 24, 1994, 10:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Dog]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Date: March 24, 1994, 6:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

(open access)

Stress-Relief Displacements Induced by Drilling--Applications to Holographic Measurements of in Situ Stress

The holographic stressmeter is an instrument which has been developed at Caltech to allow determination of the complete stress tensor from in situ borehole measurements. The stressmeter uses double-exposure holographic interferometry to record the displacements induced by the drilling of a small sidehole into the borehole wall. The local stresses, which are the result of the far-field stresses, concentrated at the borehole, cause deformation of the surface of the borehole wall in the vicinity of the sidehole. The first part of this study uses a thin infinite elastic plate subjected to plane stress at infinity to model the displacements at the borehole wall. However, the existence of some holograms which were difficult to model closely led us to examine the validity of this model. In order to investigate the problem further, we performed a two-dimensional finite element analysis for an elastic box with a terminated hole. We varied the dimensions of the hole to see what effect the radius and depth of the hole might have on the displacements. The plate model predicts that the depth of the hole should have no effect on the horizontal components of displacement, but the finite element results show that the magnitude of both …

Date: April 24, 1992

Creator: Ahrens, T. J. & Smither, C. L.

Object Type: Report

System: The UNT Digital Library

(open access)

Full-Scale Demonstration Low-NOx Cell Burner retrofit

The overall objective of the Full-Scale Low-NOx Cell (LNC) Burner Retrofit project is to demonstrate the cost-effective reduction of NOx generated by a large, base-loaded (70% capacity factor or greater), coal-fired utility boiler. Specific objectives include: at least 50% NOx reduction over standard two-nozzle cell burners, without degradation of boiler performance or life; acquire and evaluate emission and boiler performance data before and after the retrofit to determine NOx reduction and impact on overall boiler performance; and demonstrate that the LNC burner retrofits are the most cost-effective alternative to emerging, or commercially- available NOx control technology for units equipped with cell burners. The focus of this demonstration is to determine maximum NOx reduction capabilities without adversely impacting plant performance, operation and maintenance.

Date: May 24, 1991

Creator: unknown

Object Type: Report

System: The UNT Digital Library

(open access)

Improved radioimmunotherapy of hematologic malignancies

This research project proposes to develop novel new approaches of improving the radioimmunodetection and radioimmunotherapy of malignancies by augmenting retention of radioimmunoconjugates by tumor cells. The approaches shown to be effective in these laboratory experiments will subsequently be incorporated into out ongoing clinical trials in patients. Specific project objectives include: to study the rates of endocytosis, intracellular routing, and metabolic degradation of radiolabeled monoclonal antibodies targeting tumor-associated antigens on human leukemia and lymphoma cells; To examine the effects of lysosomotropic amines (e.g. chloroquine, amantadine), carboxylic ionophores (monensin, nigericin), and thioamides (propylthiouracil), on the retention of radiolabeled MoAbs by tumor cells; to examine the impact of newer radioiodination techniques (tyramine cellobiose, paraiodobenzoyl) on the metabolic degradation of radioiodinated antibodies; to compare the endocytosis, intracellular routing, and degradation of radioimmunoconjugates prepared with different radionuclides ({sup 131}Iodine, {sup 111}Indium, {sup 90}Yttrium, {sup 99m}Technetium, {sup 186}Rhenium); and to examine the utility of radioimmunoconjugates targeting oncogene products for the radioimmunotherapy and radioimmunoscintigraphy of cancer.

Date: March 24, 1992

Creator: Press, O.W.

Object Type: Report

System: The UNT Digital Library