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in subjects: "Infrared Spectra"

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Acid measurements via near-infrared spectroscopy

We were able to predict acid concentration to {plus_minus}0.08M HNO{sub 3}. In the presence of Al{sup 3} interference, the prediction dropped to {plus_minus}0.29 mols/liter over the range 0 to 9M HNO{sub 3}. Temperature affects the prediction of acid adversely and would have to be modelled out or the sample cell thermostated prior to using this method. 10 refs, 12 figs.(DLC)

Date: February 13, 1991

Creator: Buchanan, B. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Acid measurements via near-infrared spectroscopy

We were able to predict acid concentration to {plus minus}0.08M HNO{sub 3}. In the presence of Al{sup 3} interference, the prediction dropped to {plus minus}0.29 mols/liter over the range 0 to 9M HNO{sub 3}. Temperature affects the prediction of acid adversely and would have to be modelled out or the sample cell thermostated prior to using this method. 10 refs, 12 figs.(DLC)

Date: February 13, 1991

Creator: Buchanan, B. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Active sites in char gasification: Final technical report

Among the key variables in the design of gasifiers and combustors is the reactivity of the chars which must be gasified or combusted. Significant loss of unburned char is unacceptable in virtually any process; the provision of sufficient residence time for complete conversion is essential. A very wide range of reactivities are observed, depending upon the nature of the char in a process. The current work focuses on furthering the understanding of gasification reactivities of chars. It has been … more

Date: September 1, 1987

Creator: Wojtowicz, M.; Lilly, W. D.; Perkins, M. T.; Hradil, G.; Calo, J. M. & Suuberg, E. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Active sites in char gasification. Quarterly technical progress report, 1 January 1984-31 March 1984. [Polymers of phenol-formaldehyde family; chars produced from model compounds]

This project is concerned with the study of the nature and behavior of active sites in gasification of chars produced from synthesized model compounds, primarily of the phenol-formaldehyde family of resins. The current technical progress report presents further developments on resin synthesis and characterization and the design of a pyro-gasifier reactor for transient kinetic studies of the chars produced from the model compounds. 7 references, 12 figures, 2 tables.

Date: May 1, 1984

Creator: Calo, J.M.; Suubers, E.M.; Wojtowicz, M. & Lilly, W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Adaptable Multivariate Calibration Models for Spectral Applications

Multivariate calibration techniques have been used in a wide variety of spectroscopic situations. In many of these situations spectral variation can be partitioned into meaningful classes. For example, suppose that multiple spectra are obtained from each of a number of different objects wherein the level of the analyte of interest varies within each object over time. In such situations the total spectral variation observed across all measurements has two distinct general sources of variation: i… more

Date: December 20, 1999

Creator: THOMAS,EDWARD V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Advance concepts for the conversion of syngas liquids. Quarterly report no. 6, January 1--March 31, 1996

Research activities for the period January 1, 1995 to March 31, 1996 have been focused on the characterization of catalyst samples, mainly by Diffuse Reflectance Infrared Spectroscopic Techniques. These studies revealed the strong presence of hydroxyls in our synthetic metal substituted aluminophosphate (MeAPO-36) samples, the amount of which appear to vary depending on the type of metal in the framework. In this report, cases of magnesium, cobalt and manganese are highlighted and compared. The… more

Date: December 31, 1996

Creator: Szostak, R. & Ingram, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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AFNOL synthesis. Quarterly report, October--December, 1971

Five batches of unplasticized AFNOL, each approximately one pound, were synthesized using 4,4-dinitropimelic acid as the starting material. Two 10 g batches were completed prior to the pound batches to assure the usability of the acid chloride. Characterization of each of the larger batches was by differential thermal analysis (DTA), infrared spectrophotometry (IR), and cure tests. Some characterization was also done on the commercial chemicals used in the synthesis.

Date: December 31, 1971

Creator: Quinlin, W.T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

ALKALI METAL CARBONATES OF PLUTONIUM.

No Description Available.

Date: January 1, 1971

Creator: Navratil, J.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Alternative Formulations of Regenerable Flue Gas Cleanup Catalysts. Progress Report, December 1, 1992--February 28, 1993

In the work done so far, we have examined the properties of adsorbents prepared by the novel method of depositing a layer of the precursor (metal acetylacetonates) on the alumina surface. These samples were activated by decomposing the precursors to their oxides. It was possible to obtain a fairly predictable trend in the SO{sub 2} adsorption properties of the adsorbents as long as the metal acacs did not dissociate in solution. This was observed in the case of the magnesium supported samples. … more

Date: June 1, 1993

Creator: Mitchell, M. B. & White, M. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Aluminum and boron phosphates as possible proton conductors

The chemical stability and conductivity of boron and aluminum phosphates in steam are reported for P/B and P/A1 atomic ratios greater than unity at temperatures from 100/sup 0/ to 280/sup 0/C and steam pressures to 5 atmospheres. Al(PO/sub 3/)/sub 3/ and H/sub 2/ A1P/sub 3/O/sub 10/ undergo the reactions Al (PO/sub 3/)/sub 3/ + H/sub 2/) in equilibrium H/sub 2/AlP/sub 3/O/sub 10/ and H/sub 2/AlP/sub 3/O/sub 10/ ..-->.. AlPO/sub 4/ + H/sub 2/O.P/sub 2/O/sub 5/(g). At 280/sup 0/C and a steam pres… more

Date: May 1, 1985

Creator: Montoneri, E.; Salzano, F.J. & Giuffre, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Amino Acid Complexes of Rhodium(III)

This thesis will explore and study rhodium, a group VIII element that has rarely been studied.

Date: August 1965

Creator: Waller, James F.

Item Type: Thesis or Dissertation

Partner: UNT Libraries

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Amorphous silicon research Phase I. Annual subcontract report, August 1, 1994--July 31, 1995

The Principal objective of this R&D program is to expand, enhance and accelerate knowledge and capabilities for the development of high-performance, two-terminal multifunction hydrogenated amorphous silicon (a-Si:H) alloy modules. The near-term goal of the program is to achieve 12% stable efficiency by 1998 using the multifunction approach. The major effort of this program is to develop high efficiency component cells and incorporate them in the triple-junction structure to obtain the highest s… more

Date: October 1, 1995

Creator: Guha, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Amorphous silicon solar cells. Quarterly report No. 2, 1 October 1976 to 31 December 1976

Infrared absorption measurements have shown that discharge-produced a-Si contains approx. 16 at. % of bonded hydrogen when deposited near room temperature and that the hydrogen content decreases to approx. 2 at. % for a substrate temperature of approx. 500/sup 0/C. This variation in the concentration of bonded hydrogen appears to be responsible for a reduction in the optical gap as the substrate temperature increases. Improvements in the photoluminescence, the photoconductivity, and the collect… more

Date: January 1, 1977

Creator: Carlson, D.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Analyses of SRS waste glass buried in granite in Sweden and salt in the United States

Simulated Savannah River Site (SRS) waste glass forms have been buried in the granite geology of the Stirpa mine in Sweden for two years. Analyses of glass surfaces provided a measure of the performance of the waste glasses as a function of time. Similar SRS waste glass compositions have also been buried in salt at the WIPP facility in Carlsbad, New Mexico for a similar time period. Analyses of the SRS waste glasses buried in-situ in granite will be presented and compared to the performance of … more

Date: January 1, 1991

Creator: Williams, J.P. (Tuskegee Inst., AL (United States)); Wicks, G.G. (Westinghouse Savannah River Co., Aiken, SC (United States)); Clark, D.E. (Florida Univ., Gainesville, FL (United States)) & Lodding, A.R. (Chalmers Tekniska Hoegskola, Goeteborg (Sweden))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analyses of SRS waste glass buried in granite in Sweden and salt in the United States

Date: December 31, 1991

Creator: Williams, J. P.; Wicks, G. G.; Clark, D. E. & Lodding, A. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analysis of heavy oils: Method development and application to Cerro Negro heavy petroleum

On March 6, 1980, the US Department of Energy (DOE) and the Ministry of Energy and Mines of Venezuela (MEMV) entered into a joint agreement which included analysis of heavy crude oils from the Venezuelan Orinoco oil belt.The purpose of this report is to present compositional data and describe new analytical methods obtained from work on the Cerro Negro Orinoco belt crude oil since 1980. Most of the chapters focus on the methods rather than the resulting data on Cerro Negro oil, and results from… more

Date: December 1, 1989

Creator: Carbognani, L.; Hazos, M.; Sanchez, V.; Green, J. A.; Green, J. B.; Grigsby, R. D. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Analysis of volatile organic compounds from illicit cocaine samples

Detection of illicit cocaine hydrochloride shipments can be improved if there is a greater understanding of the identity and quantity of volatile compounds present. This study provides preliminary data concerning the volatile organic compounds detected in a limited Set of cocaine hydrochloride samples. In all cases, cocaine was one of the major volatile compounds detected. Other tropeines were detected in almost all samples. Low concentrations of compounds that may be residues of processing sol… more

Date: July 1, 1994

Creator: Robins, W. H. & Wright, B. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analytical Chemistry Laboratory progress report for FY 1984

Technical and administrative activities of the Analytical Chemistry Laboratory (ACL) are reported for fiscal year 1984. The ACL is a full-cost-recovery service center, with the primary mission of providing a broad range of technical support services to the scientific and engineering programs at ANL. In addition, ACL conducts a research program in analytical chemistry, works on instrumental and methods development, and provides analytical services for governmental, educational, and industrial or… more

Date: March 1, 1985

Creator: Green, D. W.; Heinrich, R. R.; Jensen, K. J. & Stetter, J. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Analytical Chemistry Laboratory progress report for FY 1985

The Analytical Chemistry Laboratory is a full-cost-recovery service center, with the primary mission of providing a broad range of technical support services to the scientific and engineering programs at ANL. In addition, ACL conducts a research program in analytical chemistry, works on instrumental and methods development, and provides analytical services for governmental, educational, and industrial organizations. The ACL handles a wide range of analytical problems, from routine standard anal… more

Date: December 1, 1985

Creator: Green, D. W.; Heinrich, R. R. & Jensen, K. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Analytical techniques for ambient sulfate aerosols

Work done to further develop the infrared spectroscopic analytical method for the analysis of atmospheric aerosol particles, as well as some exploratory work on a new procedure for determining proton acidity in aerosol samples is described. Earlier work had led to the successful use of infrared (ir) spectrophotometry for the analysis of nitrate, ammonium, and neutral and acidic sulfates in aerosol samples collected by an impactor on a Mylar-film substrate. In this work, a filter-extraction meth… more

Date: June 1, 1981

Creator: Johnson, S. A.; Graczyk, D. G.; Kumar, R. & Cunningham, P. T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Application of cryogenic spectroscopy to the determination of impurity concentration in coal gasifiers

A number of small molecules are soluble at low-to-moderate concentrations in the ir-transparent liquefied rare gases. As part of an effort to develop methods to measure concentrations of minor constituents in product gases from coal gasifiers, we have measured the infrared spectral absorbance of solutions produced by sampling cryogenically a mixture of gases and dissolving the sample in liquid xenon. Observations thus far include CO/sub 2/, CO, CH/sub 4/, and H/sub 2/ as major constituents and … more

Date: January 1, 1981

Creator: Holland, R.F. & Quigley, G.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

An application of selective electrochemical wafer thinning for silicon characterization

A new technique is reported for the rapid determination of interstitial oxygen (O{sub i}) in heavily doped n{sup +} and p{sup +} silicon. This technique includes application of a selective electrochemical thinning (SET) process and FTIR transmittance measurement on a limited area of a silicon wafer. The O{sub i} is calculated using ASTM F1188--88 with the IOC 88 calibration factor. An advantage of SET over mechanical thinning is that the original wafer thickness and diameter are maintained for … more

Date: January 1, 1990

Creator: Medernach, J.W.; Stein, H.J. & Stevenson, J.O.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Assessment of dosimetry requirements and techniques for measuring polycyclic aromatic hydrocarbons. [13 refs]

A prediction by ERDA is that, within a decade, 10/sup 6/ barrels/day of synthetic fuel will come from liquefaction of coal. The coproduction of highly carcinogenic polycyclic aromatic hydrocarbons (PAH) will necessitate much better dosimetry and means of personnel protection than exist today. Traditional techniques for measuring PAH are gas chromatography with mass spectroscopy, and fluorescence spectroscopy. Several newly developed, or developing techniques, may also lend themselves to PAH dos… more

Date: January 1, 1976

Creator: Hawthorne, A R; Gammage, R B & Simpkin, D J

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Attenuated total reflection of dielectric/metal interfaces

An experimental system for the characterization of metal/dielectric interfaces has been developed. Attenuated Total Reflection (ATR) spectroscopy of a dielectric on a thin metal film, deposited on a multiple reflection ATR element, yields information about the bonding, or lack thereof, at the metal/dielectric interface. At a certain metal thickness, the absorbance due to molecules at the interface, relative to the signal from the bulk dielectric, is at a maximum. A model which uses the Fresnel … more

Date: August 1, 1997

Creator: Clemen, L. L.; Strunk, M. R.; Niemczyk, T. M. & Haaland, D. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department