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Title: COMPARISON OF NIGHTTIME AND DAYTIME ABSORPTION OF THE SODIUM D(2) LINE.
Creator: SIDES, VICTORIA LOUISE., Florida Atlantic University
Abstract/Description: A high resolution study of nighttime and daytime absorption of the sodium n2 line was made at Florida Atlantic University, Boca Raton, Florida (26°22'N latitude, 80°6 1W longitude) from October 1970 to April 1971 using a Pepsios (polyetalon pressure scanning interferometric optical spectrometer). Line scans were taken with photoelectric detection of the sodium D^2 line using sunlight in the daytime and moonlight in the nighttime. A computer analysis of the line scans determined the...
Show moreA high resolution study of nighttime and daytime absorption of the sodium n2 line was made at Florida Atlantic University, Boca Raton, Florida (26°22'N latitude, 80°6 1W longitude) from October 1970 to April 1971 using a Pepsios (polyetalon pressure scanning interferometric optical spectrometer). Line scans were taken with photoelectric detection of the sodium D^2 line using sunlight in the daytime and moonlight in the nighttime. A computer analysis of the line scans determined the terrestrial free sodium abundance and the related uncertainty. The average monthly daytime sodium abundance for the winter was 5.32 ± 1.0 x 10^9 atoms/cm^2. Nighttime averages made by several procedures yielded sodium abundances for the winter months in the range 5.2 - 6.2 ± 4.0 x 10^9 atoms/cm^2. Separate averages made of the evening and morning moonlight traces were apparently affected in different ways by cumulus clouds or by sodium nightglow. This uncertainty of interpretation along with the generally poor signal to noise ratio for the moonlight data suggests that a low degree of confidence be given to the apparent agreement in average sodium abundances derived from these sunlight and moonlight measurements.
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Date Issued: 1971
PURL: http://purl.flvc.org/fcla/dt/13437
Subject Headings: Sodium--Spectra, Absorption spectra, Atomic absorption spectra
Format: Document (PDF)

Title: A COMPARISON OF SODIUM ABUNDANCES CALCULATED FROM DAYLIGHT ABSORPTION AND TWILIGHT EMISSION IN THE D(2) LINE.
Creator: LASHER, RICHARD WILLIAM, Florida Atlantic University, Burnett, Clyde R., Charles E. Schmidt College of Science, Department of Physics
Abstract/Description: A method is presented, in which the Pepsios is used to measure abundances of atomic sodium present in the upper atmosphere as calculated from the twilight glow. These abundances are compared with daylight absorption abundances, also measured using the Pepsios. Ten measurements taken during March, 1971 show an average twilight abundance of (6.1 +- 1.8) x 10^9 atoms/cm^2. This compares with an average absorption abundance of (3.3 +- 1.1) x 10^9 atoms/cm^2. These limited data and their attendant...
Show moreA method is presented, in which the Pepsios is used to measure abundances of atomic sodium present in the upper atmosphere as calculated from the twilight glow. These abundances are compared with daylight absorption abundances, also measured using the Pepsios. Ten measurements taken during March, 1971 show an average twilight abundance of (6.1 +- 1.8) x 10^9 atoms/cm^2. This compares with an average absorption abundance of (3.3 +- 1.1) x 10^9 atoms/cm^2. These limited data and their attendant uncertainties reveal no significant discrepancy between twilight and daytime sodium abundances.
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Date Issued: 1971
PURL: http://purl.flvc.org/fcla/dt/13449
Subject Headings: Sodium--Spectra, Absorption spectra
Format: Document (PDF)

Title: MEASUREMENTS OF TERRESTRIAL OH ABUNDANCES BY SPECTROSCOPIC OBSERVATION OF RESONANCE ABSORPTION OF SUNLIGHT.
Creator: SPERANZA, PATRICK DANIEL, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Physics
Abstract/Description: Measurements of the atmospheric hydroxyl radical (OH) abundance were made at Boca Raton, Florida, (26° 22' N, 80° 6' W) during the period March 14 through April 9, 1977. Observations were made on the P1(1) line of the A^2sigma+ - x^2pi(0,0) rotation band of OH at 3081.7A. By the use of the high resolution Pepsios (poly-etalon pressure scanning interferometric optical spectrometer) spectrometer, the narrow absorption curve due to terrestrial OH was distinguished from the broad solar Fraunhofer...
Show moreMeasurements of the atmospheric hydroxyl radical (OH) abundance were made at Boca Raton, Florida, (26° 22' N, 80° 6' W) during the period March 14 through April 9, 1977. Observations were made on the P1(1) line of the A^2sigma+ - x^2pi(0,0) rotation band of OH at 3081.7A. By the use of the high resolution Pepsios (poly-etalon pressure scanning interferometric optical spectrometer) spectrometer, the narrow absorption curve due to terrestrial OH was distinguished from the broad solar Fraunhofer line. Measurements of the amount of atmospheric OH absorption indicated an average vertical column abundance of (2.0 +- 0.8) (10^13) molecules/cm^2 for this observation period.
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Date Issued: 1977
PURL: http://purl.flvc.org/fcla/dt/13848
Subject Headings: Hydroxides--Absorption and adsorption, Atmospheric ozone
Format: Document (PDF)

Title: SPECTROSCOPIC MEASUREMENTS OF OH ABUNDANCES IN THE TERRESTRIAL ATMOSPHERE.
Creator: LANGSTON, JAMES HUTTON, II., Florida Atlantic University, Burnett, Clyde R., Charles E. Schmidt College of Science, Department of Physics
Abstract/Description: Spectroscopic observations were made of the resonance absorption of sunlight by the atmospheric hydroxyl radical (OH). The abundance of 0 terrestrial OH was measured from the Fritz Peak Observatory (39.92 N, 105.50°W) in Colorado during September of 1978. These measurements were made on the absorption of the P1 (1) line of the A^2sigma^+ - x^2pi(O , O) rotational band of OH at 3081.7 A. The instrument used was the PEPSIOS (Poly Etalon Pressure Scanned Interferometric Optical Spectrometer)...
Show moreSpectroscopic observations were made of the resonance absorption of sunlight by the atmospheric hydroxyl radical (OH). The abundance of 0 terrestrial OH was measured from the Fritz Peak Observatory (39.92 N, 105.50°W) in Colorado during September of 1978. These measurements were made on the absorption of the P1 (1) line of the A^2sigma^+ - x^2pi(O , O) rotational band of OH at 3081.7 A. The instrument used was the PEPSIOS (Poly Etalon Pressure Scanned Interferometric Optical Spectrometer) because of its high luminosity - resolution product . The computer methods ·~sed in the analysis procedure are described . These measurements indicated an average daytime vertical column abundance of (5.40 ± 0.67) x 10^13 OH molecules/cm^2.
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Date Issued: 1979
PURL: http://purl.flvc.org/fcla/dt/13968
Subject Headings: Spectrum analysis, Absorption spectra, Atmospheric chemistry
Format: Document (PDF)

Title: Simplex optimization of aluminum analysis by electrothermal atomic absorption spectrometry.
Creator: Creelman, David Karl., Florida Atlantic University, Haky, Jerome E.
Abstract/Description: A novel simplex method was applied for the systematic selection of optimal concentrations of two matrix modifiers, nitric acid and magnesium nitrate, for aluminum analysis in aqueous samples using electrothermal atomic absorption spectrometry. Independent optimizations of sensitivity were performed over several practical concentration ranges for each matrix modifier and optimum concentrations were chosen by comparison of data obtained for the resulting simplexes. The results indicate a strong...
Show moreA novel simplex method was applied for the systematic selection of optimal concentrations of two matrix modifiers, nitric acid and magnesium nitrate, for aluminum analysis in aqueous samples using electrothermal atomic absorption spectrometry. Independent optimizations of sensitivity were performed over several practical concentration ranges for each matrix modifier and optimum concentrations were chosen by comparison of data obtained for the resulting simplexes. The results indicate a strong interdependency between magnesium and nitric acid in the achievement of conditions for optimum sensitivity. Using the optimized conditions, detection limits of less than 7 parts per billion of aluminum were achieved, with relative standard deviations of less than 10%. A variety of aqueous samples were analyzed yielding relative standard deviations from 2 to 10%.
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Date Issued: 1997
PURL: http://purl.flvc.org/fcla/dt/15399
Subject Headings: Atomic absorption spectroscopy, Aluminum--Analysis
Format: Document (PDF)

Title: Effects of ammonium nitrate on sensitivity for determinations of copper, iron, and manganese in sea water by atomic absorption spectrometry with pyrolytically coated graphite tubes.
Creator: Montgomery, John R., Peterson, Gary N., Harbor Branch Oceanographic Institute
Date Issued: 1980
PURL: http://purl.flvc.org/FCLA/DT/3331817
Subject Headings: Ammonium nitrate, Seawater--Analysis, Atomic absorption spectroscopy
Format: Document (PDF)

Title: Decompression cycling effects on the shelf life of lithium hydroxide.
Creator: Wang, Tsen C., Harbor Branch Oceanographic Institute
Date Issued: 1975
PURL: http://purl.flvc.org/FCLA/DT/3338492
Subject Headings: Lithium hydroxide, Carbon dioxide--Absorption and adsorption, Submersibles, Decompression
Format: Document (PDF)

Title: Heavy Metal Binding and Removal by Phormidium.
Creator: Wang, Tsen C., Weissman, J. C., Ramesh, G., Varadarajan, R., Benemann, J. R., Harbor Branch Oceanographic Institute
Date Issued: 1998
PURL: http://purl.flvc.org/FCLA/DT/3176821
Subject Headings: Heavy metals--Absorption and adsorption, Bioremediation, Microalgae
Format: Document (PDF)

Title: Heavy metal toxicity ebbs and flows in wastestabilisation ponds.
Creator: Govindan, V. S., Ramesh, G., Harbor Branch Oceanographic Institute
Date Issued: 1994
PURL: http://purl.flvc.org/fau/fd/FA00007411
Subject Headings: Heavy metals--Absorption and adsorption, Sewage lagoons
Format: Document (PDF)

Title: Influence of Voids on Water Uptake in Polymer Panels.
Creator: Abdelmola, Fatmaelzahraa, Carlsson, Leif A., Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: The influence of voids on the moisture uptake of epoxy has been studied. Specimens with void contents from 0 to about 50% were prepared. Void geometry and content were analyzed using microscopy and density methods. Void containing dry samples were characterized by Differential Scanning Calorimetry and Dynamic-Mechanical Analysis which verified consistency of chemistry of the epoxy network. The moisture uptake of specimens immersed in distilled water at 40 °C was monitored. The rate of...
Show moreThe influence of voids on the moisture uptake of epoxy has been studied. Specimens with void contents from 0 to about 50% were prepared. Void geometry and content were analyzed using microscopy and density methods. Void containing dry samples were characterized by Differential Scanning Calorimetry and Dynamic-Mechanical Analysis which verified consistency of chemistry of the epoxy network. The moisture uptake of specimens immersed in distilled water at 40 °C was monitored. The rate of absorption and saturation moisture content increased with increasing void content. The moisture uptake of void-free and void containing specimens was non-Fickian. The Langmuir model provided good fits to the experimental results for specimens with low to medium void content, although the moisture uptake of the high void content specimens showed substantial deviations from the Langmuir diffusion model. The moisture diffusivity agreed reasonably with predications from the Maxwell inclusion model over a range of void contents from 0 to 50%. The state of sorbed water was examined using mass balance calculations and DSC analysis. Only 6-8% of the void volume is occupied by water at saturation. Absorbed water may be classified as free and bound water. For void-free specimens, only bound water was found. The medium and high void content specimens contained water in three states: free water, freezable bound water, and non-freezable bound water. The DSC results show that the proportions of free water and freezable bound water increase with increasing void content, while the content of non-freezable bound water decreased. Moisture induced swelling decreased with increasing void content. The swelling is attributed to the content of non-freezable bound water.
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Date Issued: 2018
PURL: http://purl.flvc.org/fau/fd/FA00013137
Subject Headings: Polymers--Absorption and adsorption, Epoxy resins, Water
Format: Document (PDF)

Title: Computer program for lithium hydroxide - carbon dioxide absorption in underwater life support systems.
Creator: Wang, Tsen C., Liou, M. C., Hendry, C., Harbor Branch Oceanographic Institute
Date Issued: 1989
PURL: http://purl.flvc.org/fau/fd/FA00007497
Subject Headings: Lithium hydroxide, Carbon dioxide--Absorption and adsorption, Life Support Systems, Ocean engineering
Format: Document (PDF)

Title: Screening of aquatic plants and algae for removal of toxic heavy metals.
Creator: Wang, Tsen C., Ramesh, G., Weissman, J. C., Varadarajan, R., Benemann, J. R., Harbor Branch Oceanographic Institute
Date Issued: 1996
PURL: http://purl.flvc.org/fau/fd/FA00007336
Subject Headings: Heavy metals, Aquatic plants, Algae, Heavy metals--Absorption and adsorption.
Format: Document (PDF)

Title: Modeling of axial flow canisters for carbon dioxide-lithium hydroxide absorption in underwater life support systems.
Creator: Liou, M. C., Wang, Tsen C., Harbor Branch Oceanographic Institute
Date Issued: 1987
PURL: http://purl.flvc.org/fau/fd/FA00007494
Subject Headings: Life Support Systems, Carbon dioxide--Absorption and adsorption, Lithium hydroxide, Axial flow, Ocean engineering
Format: Document (PDF)

Title: Carbon Dioxide scrubbing materials in life support equipment.
Creator: Wang, Tsen C., Harbor Branch Oceanographic Institute
Date Issued: 1982
PURL: http://purl.flvc.org/fau/fd/FA00007000
Subject Headings: Carbon dioxide, Life Support Systems, Carbon dioxide--Absorption and adsorption
Format: Document (PDF)

Title: Parameters for removal of toxic heavy metals by water milfoil (Myriophyllum spicatum).
Creator: Wang, Tsen C., Weissman, J. C., Ramesh, G., Varadarajan, R., Benemann, J. R., Harbor Branch Oceanographic Institute
Date Issued: 1996
PURL: http://purl.flvc.org/FCLA/DT/3318889
Subject Headings: Heavy metals, Myriophyllum spicatum, Eurasian watermilfoil, Heavy metals--Absorption and adsorption
Format: Document (PDF)

Title: Application of electrochemical impedance spectroscopy as a non-destructive technique to characterize and detect degradation of carbon/nylon, 6 composites in aqueous environments.
Creator: Haniyur, Ravishankar V., Florida Atlantic University, McIntyre, Jack F.
Abstract/Description: Experiments were conducted to investigate the degradative effects of ambient and high pressure aqueous environments on unidirectional carbon fiber nylon (AS4/nylon 6) composites. Electrochemical impedance spectroscopy (EIS) was selected for development as a non-destructive method to characterize the degradation phenomena in carbon/nylon composites as result of moisture absorption. EIS data was collected for composites and neat resins as a function of immersion time in ambient and pressurized ...
Show moreExperiments were conducted to investigate the degradative effects of ambient and high pressure aqueous environments on unidirectional carbon fiber nylon (AS4/nylon 6) composites. Electrochemical impedance spectroscopy (EIS) was selected for development as a non-destructive method to characterize the degradation phenomena in carbon/nylon composites as result of moisture absorption. EIS data was collected for composites and neat resins as a function of immersion time in ambient and pressurized (6.2 MPa) 3.5% NaCl solution. EIS was also utilized to understand degradative mechanisms when composites were subject to cathodically induced damage. Concurrent EIS and 3-point mechanical loading was also performed on composites to study the changes in the impedance response as a function of loading. A detailed equivalent circuit analysis is also presented in an attempt to elucidate the degradation phenomena in composites. Gravimetric and 3-point mechanical testing data is also presented to study the effect of ambient and pressurized aqueous environments on composites. Scanning electron micrographs of composites are also included to assist in morphological evaluation.
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Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/14907
Subject Headings: Impedance spectroscopy, Composite materials, Polymeric composites, Absorption, Environmental degradation--Moisture
Format: Document (PDF)

Title: CO2 absorption capacity of new and old lithium hydroxide used in underwater life support systems.
Creator: Wang, Tsen C., Krivan, J. P., Jr., Harbor Branch Oceanographic Institute
Date Issued: 1997
PURL: http://purl.flvc.org/fau/fd/FA00007131
Subject Headings: Carbon dioxide--Absorption and adsorption, Lithium hydroxide, Life Support Systems
Format: Document (PDF)

Title: The effects of systemic herbicide used for invasive species management on a native Florida scrub seed bank.
Creator: Ryan, Kathleen S., Florida Atlantic University, Violin, John
Abstract/Description: This study focused on whether use of ArsenalRTM to control an invasive, non-indigenous tree, Schinus terebinthifolius, would either negatively affect the seed bank in treatment areas of the study site or seeds in litter, 0-5 cm or 5-15 cm layers of the bank. Neither examining the whole site nor the two habitats produced conclusive results, but examining the three layers did. The litter layer appeared to be most sensitive to herbicide treatment with a 47% (p=0.03) reduction in seedling...
Show moreThis study focused on whether use of ArsenalRTM to control an invasive, non-indigenous tree, Schinus terebinthifolius, would either negatively affect the seed bank in treatment areas of the study site or seeds in litter, 0-5 cm or 5-15 cm layers of the bank. Neither examining the whole site nor the two habitats produced conclusive results, but examining the three layers did. The litter layer appeared to be most sensitive to herbicide treatment with a 47% (p=0.03) reduction in seedling emergence after treatment. Analysis of herbicide effect therefore required studying depth, habitat and study site. The litter layer, seldom considered in seed bank studies, produced 33% of emerging seedlings in this study. It is an extremely important component as it is the first place seeds are deposited before they percolate down into the soil. Damage to this layer will not only affect current seedling emergence, but future content of the seed bank below the surface.
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Date Issued: 2005
PURL: http://purl.flvc.org/fcla/dt/13301
Subject Headings: Soil seed banks--Florida, Soil absorption and adsorption--Florida, Soil remediation--Florida, Ecosystem management--Florida
Format: Document (PDF)

Title: Heavy Metal Sorption by Aquatic Plants in Taiwan.
Creator: Lee, C.-L., Wang, Tsen C., Hsu, C.-H., Chiou, A.-A., Harbor Branch Oceanographic Institute
Date Issued: 1998
PURL: http://purl.flvc.org/FCLA/DT/3169902
Subject Headings: Heavy metals --Environmental aspects, Heavy-metal tolerant plants, Plants --Effect of heavy metals on, Heavy metals--Absorption and adsorption, Water --Pollution
Format: Document (PDF)

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