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Title: INVESTIGATING THE POTENTIAL OF AMINE-GRAFTED SILICA MATERIALS FOR SIMULTANEOUS REMOVAL OF CARBON DIOXIDE, WATER VAPOR, AND HYDROGEN SULFIDE FROM LANDFILL GAS.
Creator: Lam, Dung, Lashaki, Masoud Jahandar, Florida Atlantic University, Department of Civil, Environmental and Geomatics Engineering, College of Engineering and Computer Science
Abstract/Description: Amine-grafted silica (i.e., aminosilicas) was investigated for single-stage landfill gas purification via simultaneous removal of CO2, H2S, and water vapor. Aminosilica materials were synthesized by covalent triamine grafting onto mesoporous silica with custom amounts of water and amine. Screening adsorption experiments were completed in dry 30 vol.% CO2 in N2 at 40 °C and assessed using thermogravimetric analysis. Materials with equilibrium CO2 uptakes greater than 1.5 mmol/g were chosen for...
Show moreAmine-grafted silica (i.e., aminosilicas) was investigated for single-stage landfill gas purification via simultaneous removal of CO2, H2S, and water vapor. Aminosilica materials were synthesized by covalent triamine grafting onto mesoporous silica with custom amounts of water and amine. Screening adsorption experiments were completed in dry 30 vol.% CO2 in N2 at 40 °C and assessed using thermogravimetric analysis. Materials with equilibrium CO2 uptakes greater than 1.5 mmol/g were chosen for CO2 adsorption kinetics assessments. The highest-performing aminosilica achieved fast CO2 adsorption by reaching 80% of its equilibrium uptake in one minute. This material also maintained 100% of its initial CO2 uptake when subjected to rigorous 100-cycle testing. It underwent column-breakthrough tests in the presence of different dry and humid gas streams containing CO2, H2S, and water vapor, and achieved concurrent and complete (100%) removal of all target impurities. The results suggest that aminosilicas can purify landfill gas in a single stage.
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Date Issued: 2023
PURL: http://purl.flvc.org/fau/fd/FA00014182
Subject Headings: Gases--Purification, Landfill gases--Purification
Format: Document (PDF)

Title: A study of bioeffluents in a college classroom.
Creator: Wang, Tsen C., Harbor Branch Oceanographic Institute
Date Issued: 1975
PURL: http://purl.flvc.org/fau/fd/FA00007050
Subject Headings: Pollutants, Indoor air quality, Gases, Vapors
Format: Document (PDF)

Title: CONNECTING THE NOSE AND THE BRAIN: DEEP LEARNING FOR CHEMICAL GAS SENSING.
Creator: Stark, Emily Nicole, Barenholtz, Elan, Florida Atlantic University, Department of Psychology, Charles E. Schmidt College of Science
Abstract/Description: The success of deep learning in applications including computer vision, natural language processing, and even the game of Go can only be a orded by powerful computational resources and vast data sets. Data sets coming from the medical application are often much smaller and harder to acquire. Here a novel data approach is explained and used to demonstrate how to use deep learning as a step in data discovery, classi cation, and ultimately support for further investigation. Data sets used to...
Show moreThe success of deep learning in applications including computer vision, natural language processing, and even the game of Go can only be a orded by powerful computational resources and vast data sets. Data sets coming from the medical application are often much smaller and harder to acquire. Here a novel data approach is explained and used to demonstrate how to use deep learning as a step in data discovery, classi cation, and ultimately support for further investigation. Data sets used to illustrate these successes come from common ion-separation techniques that allow for gas samples to be quantitatively analyzed. The success of this data approach allows for the deployment of deep learning to smaller data sets.
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Date Issued: 2019
PURL: http://purl.flvc.org/fau/fd/FA00013416
Subject Headings: Deep Learning, Data sets, Gases--Analysis
Format: Document (PDF)

Title: Experimental Investigation of Cyclotron Harmonic Emission by a Reflex Discharge Plasma.
Creator: Hanisch, John L., Stetson, Robert F., Florida Atlantic University
Abstract/Description: Emission of radiation from an argon and helium plasma perpendicular to the applied magnetic field in the x-band is discussed. Microwave emission was observed when the cyclotron frequency at the center of the plasma was above the mixer frequency of the radiometer, and at what appears to be multiples of the cyclotron frequency. An explanation of the microwave emission based on the solution of the Boltzmann equation assuming electron-neutral collisions is discussed. The temperature and density...
Show moreEmission of radiation from an argon and helium plasma perpendicular to the applied magnetic field in the x-band is discussed. Microwave emission was observed when the cyclotron frequency at the center of the plasma was above the mixer frequency of the radiometer, and at what appears to be multiples of the cyclotron frequency. An explanation of the microwave emission based on the solution of the Boltzmann equation assuming electron-neutral collisions is discussed. The temperature and density of the plasma were determined from probe and spectroscopic experiments. Temperatures in the range of 4 to 16 eV were measured and probe data indicated a plasma density from (0.5 - 3) x 10^9 cm^-3.
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Date Issued: 1968
PURL: http://purl.flvc.org/fau/fd/FA00000755
Subject Headings: Plasma (Ionized gases), Physics--Experiments
Format: Document (PDF)

Title: MADE-TO-ORDER AMINE-GRAFTED SILICA MATERIALS FOR SINGLE-STAGE PURIFICATION OF BIOGAS AND LANDFILL GAS.
Creator: Ayub, Ali, Lashaki, Masoud Jahandar, Florida Atlantic University, Department of Civil, Environmental and Geomatics Engineering, College of Engineering and Computer Science
Abstract/Description: The potential of amine-grafted silica materials (i.e., aminosilicas) was investigated for single-stage biogas and landfill gas purification via simultaneous removal of CO2, H2S, and water vapor. Custom aminosilicas were synthesized by covalent tethering of primary amines onto commercially available mesoporous silica. Screening adsorption experiments were completed at 40°C in the presence of dry 30 vol.% CO2 in N2, and performance was measured using thermogravimetric analysis. Selected...
Show moreThe potential of amine-grafted silica materials (i.e., aminosilicas) was investigated for single-stage biogas and landfill gas purification via simultaneous removal of CO2, H2S, and water vapor. Custom aminosilicas were synthesized by covalent tethering of primary amines onto commercially available mesoporous silica. Screening adsorption experiments were completed at 40°C in the presence of dry 30 vol.% CO2 in N2, and performance was measured using thermogravimetric analysis. Selected materials with equilibrium CO2 uptakes greater than 6 wt.% were chosen for additional assessments in terms of CO2 adsorption kinetics. The highest-performing aminosilica achieved fast CO2 uptake by reaching 82% of its equilibrium CO2 uptake in one minute. This material was subjected to rigorous 100-cycle testing and retained stable performance as evidenced by maintaining 99% of its initial CO2 uptake throughout cycling. The final candidate also underwent multicomponent column-breakthrough tests and achieved complete (100%) removal of all target impurities. The results suggest promising potential of aminosilicas as a viable method of biogas and landfill gas purification.
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Date Issued: 2021
PURL: http://purl.flvc.org/fau/fd/FA00013834
Subject Headings: Landfill gases--Purification, Biogas--Purification
Format: Document (PDF)

Title: WASTE DERIVED ACTIVATED CARBON MATERIALS FOR LANDFILL GAS PURIFICATION.
Creator: Thomas, Ryan, Lashaki, Masoud Jahandar, Florida Atlantic University, Department of Civil, Environmental and Geomatics Engineering, College of Engineering and Computer Science
Abstract/Description: The potential of paper waste-derived activated carbon was investigated for the removal of carbon dioxide and hydrogen sulfide from landfill gas. Activated carbon materials were prepared by carbonizing paper waste followed by acid treatment to remove ash, mixing with aqueous phase potassium hydroxide, and activation via microwave heating. Activated samples were tested using thermogravimetric analysis to determine their equilibrium uptake of carbon dioxide. The adsorbent materials were modified...
Show moreThe potential of paper waste-derived activated carbon was investigated for the removal of carbon dioxide and hydrogen sulfide from landfill gas. Activated carbon materials were prepared by carbonizing paper waste followed by acid treatment to remove ash, mixing with aqueous phase potassium hydroxide, and activation via microwave heating. Activated samples were tested using thermogravimetric analysis to determine their equilibrium uptake of carbon dioxide. The adsorbent materials were modified with both tetraethylenepentamine and diethanolamine to potentially increase the carbon dioxide uptake, however, all the modified samples had a performance significantly worse than their unmodified counterparts. Adsorbent screening was conducted in conditions mimicking that of landfill gas, namely temperature of 40 °C and 40% carbon dioxide in nitrogen. Performant samples were identified as those achieving uptakes greater than 3 wt.%. The best performing sample achieved an uptake of 5.03 wt.% and maintained 97% of its uptake during 100 successive adsorption-desorption cycles. Column-breakthrough experiments demonstrated that the final candidate achieved complete removal of both carbon dioxide and hydrogen sulfide, suggesting viability for larger scale landfill gas purification.
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Date Issued: 2022
PURL: http://purl.flvc.org/fau/fd/FA00014106
Subject Headings: Landfill gases--Purification, Carbon, Activated, Adsorption
Format: Document (PDF)

Title: Using Hydrogeophysical Methods for Investigating Carbon Dynamics in the Greater Everglades Watershed: Implications for the Spatial and Temporal Variability in Carbon Stocks and Biogenic Gas Fluxes.
Creator: McClellan, Matthew D., Comas, Xavier, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description: Peat soils store a large fraction of the global soil carbon (C) pool and comprise 95% of wetland C stocks. They also have the capability to produce and release significant amounts of greenhouse gasses (CO2, CH4) into the atmosphere. Most studies of wetland soil C and gas flux dynamics have been done in expansive peatlands in northern boreal and subarctic biomes. However, wetlands in temperate and tropical climates are vastly understudied despite accounting for more than 20% of the global...
Show morePeat soils store a large fraction of the global soil carbon (C) pool and comprise 95% of wetland C stocks. They also have the capability to produce and release significant amounts of greenhouse gasses (CO2, CH4) into the atmosphere. Most studies of wetland soil C and gas flux dynamics have been done in expansive peatlands in northern boreal and subarctic biomes. However, wetlands in temperate and tropical climates are vastly understudied despite accounting for more than 20% of the global peatland C stock and storing large amounts of biogenic gasses Although studies investigating greenhouse gas dynamics from peatlands have increased during the last decade, the spatial and temporal distribution of these gases still remains highly uncertain, mainly due to the limitations in terms of spatial and temporal resolution and invasive nature of most methods traditionally used. This thesis combines a series of field and laboratory studies at several sites in the Greater Everglades as examples to show the potential of hydrogeophysical methods to better understand: 1) the belowground C distribution and overall contribution to the global C stocks of certain wetlands (Chapter 2); and 2) the spatial and temporal variability in both C accumulation and releases from peat soil monoliths from several wetland sites in the Greater Everglades (Chapter 3 and 4). To estimate belowground C in the field, I used a combination of indirect non-invasive geophysical methods (GPR), aerial imagery, and direct measurements (coring) to estimate the contribution of subtropical depressional wetlands to the total C stock of pine flatwoods landscape at the Disney Wilderness Preserve (DWP, Orlando, FL). Three-dimensional (3D) GPR surveys were used to define the thickness of stratigraphic layers from the wetland surface to the mineral soil interface within depressional wetlands. Depth-profile cores in conjunction with C core analysis were utilized to visually confirm depths of each interface and estimate changes in soil C content with depth and were ultimately used to estimate total peat volume and C stock for each depressional wetland. Aerial photographs were used to develop a relationship between surface area and total wetland C stock, that were applied to estimate total landscape C stock of all depressional wetlands throughout the entire preserve. Additionally, low-frequency GPR surveys were conducted to image the stratigraphy underneath the peat basin of depressional wetlands to depict lithological controls on the formational processes of depressional wetlands at the DWP. Spatial and temporal variability in biogenic greenhouse gas (i.e. methane and carbon dioxide) production and release were investigated at the laboratory scale. Two 38 liter (0.5 m x 0.23 m x 0.3 m) peat monoliths from two different wetland ecosystems in central Florida (sawgrass peatland and a wet prairie) were compared in order to understand whether changes in matrix properties influence gas dynamics in a controlled environment (i.e. constant temperature). Gas content variability (i.e. build-up and release) within the peat matrix was estimated using a series of high frequency (1.2 GHz) GPR transects along each sample about three times a week. An array of gas traps (eight per sample) fitted with time-lapse cameras were also used in order to constrain GPR measurements and capture gas releases at 15-minute intervals. Gas chromatography was performed on gas samples extracted from the traps to determine CH4 and CO2 content. Also, at the lab scale, temporal variability in biogenic gas accumulation and release was investigated in a large 0.073 m3 peat monolith from the Blue Cypress Preserve in central Florida. An autonomous rail system was constructed in order to estimate gas content variability (i.e. build-up and release) within the peat matrix using a series of continuous GPR transects along the sample. This system ran virtually nonstop using high frequency (1.2 GHz) antennas. GPR measurements were again constrained with an array of gas traps (6) fitted with time-lapse cameras and gas chromatography. The aim of this study is to better constrain temporal scale, and better understand the heterogeneous nature (both in time and space) of gas releases from peat soils.
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Date Issued: 2019
PURL: http://purl.flvc.org/fau/fd/FA00013238
Subject Headings: Greenhouse gases, Everglades (Fla.), Peatlands, Carbon, Bogenic gas
Format: Document (PDF)

Title: Viscosity correction for breathing gas mixtures measured via a laminar flow element.
Creator: Signo, Barbara., Florida Atlantic University, Moslemian, Davood, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description: To minimize previously observed inaccuracies in the measurement of the flow rates of breathing gas mixtures, errors in the measurement of the pressure differential across the LFE with short diffusers using high frequency response pressure transducers were ruled out. A Laminar Flow Element was calibrated with air, nitrogen, and helium at various pressure and temperature conditions. The feasibility of using the Universal Calibration Curve determined from atmospheric air data to estimate the...
Show moreTo minimize previously observed inaccuracies in the measurement of the flow rates of breathing gas mixtures, errors in the measurement of the pressure differential across the LFE with short diffusers using high frequency response pressure transducers were ruled out. A Laminar Flow Element was calibrated with air, nitrogen, and helium at various pressure and temperature conditions. The feasibility of using the Universal Calibration Curve determined from atmospheric air data to estimate the flow rate of other gases at hyperbaric conditions was evaluated. The viscosity values of pure gases calculated by theoretical methods were compared to the viscosity values estimated by using the Universal Calibration Curve Viscosity Iteration method. Using flowrate calibration data for the gas mixtures of interest, the viscosity values for these gas mixtures were estimated. These viscosity values were then compared to the corresponding viscosity values calculated by theoretical methods. The Universal Calibration Curve obtained by fitting flowrate calibration data of air flowing at STP can be used to estimate the flow of other gases flowing at hyperbaric pressures.
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Date Issued: 1993
PURL: http://purl.flvc.org/fcla/dt/14981
Subject Headings: Viscosity, Gases--Viscosity, Flow meters, Gas flow--Measurement
Format: Document (PDF)

Title: Measurement of Electron Temperature and Density in a Reflex Discharge.
Creator: Scalise, Stanley J., Stetson, Robert F., Florida Atlantic University
Abstract/Description: An experimental investigation of a reflex discharge in Argon is carried out. Definition is made of a region of acceptable operating parameters consistent with continuous, stable operation of the plasma. Electron temperature is measured through the use of spectroscopy, electrostatic wave propagation, and Langmuir Probes. An electron temperature in the 1 eV to 5 eV range is indicated. Electron density is measured through the observation of the upperhybrid frequency. This observation yields an...
Show moreAn experimental investigation of a reflex discharge in Argon is carried out. Definition is made of a region of acceptable operating parameters consistent with continuous, stable operation of the plasma. Electron temperature is measured through the use of spectroscopy, electrostatic wave propagation, and Langmuir Probes. An electron temperature in the 1 eV to 5 eV range is indicated. Electron density is measured through the observation of the upperhybrid frequency. This observation yields an electron density in the region from .27 x 10^8/cm^3 to 2.38 x 10^8/cm^3. The microwave apparatus used in the density measurement is described in detail.
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Date Issued: 1967
PURL: http://purl.flvc.org/fau/fd/FA00000825
Subject Headings: Plasma (Ionized gases), Low temperature plasmas, Plasma density, Microwave measurements, Plasma diagnostics
Format: Document (PDF)

Title: Meteorological Conditions Affecting the Dispersion of Landfill Odor Complaints.
Creator: Vidovic, Mateja, Meeroff, Daniel E., Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description: One of the factors recognized as affecting the dispersion of landfill odors off-site are complex meteorological conditions. A major issue is lack of consistent means to identify the odors and their intensity. The aim of this research was to investigate the influence of meteorological parameters (temperature, humidity, pressure, wind direction, wind speed, precipitation accumulation and weather conditions) on the frequency of odor complaints from nearby neighborhoods. Methods involved...
Show moreOne of the factors recognized as affecting the dispersion of landfill odors off-site are complex meteorological conditions. A major issue is lack of consistent means to identify the odors and their intensity. The aim of this research was to investigate the influence of meteorological parameters (temperature, humidity, pressure, wind direction, wind speed, precipitation accumulation and weather conditions) on the frequency of odor complaints from nearby neighborhoods. Methods involved collection of ten years of data on odor complaints and weather conditions to determine if there were commonalities. Sophisticated statistical analyses employed did not reveal any relationships between odor complaints and weather alone. Need for substantial improvement of detailed information is recognized. To help identify the factors that influence odor complaints- a revised odor complaint form, along with operational adjustments, were recommended. An “Odor Threat Assessment Level” is proposed to assist landfill site personnel in managing daily operations, based on weather conditions.
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Date Issued: 2017
PURL: http://purl.flvc.org/fau/fd/FA00004947, http://purl.flvc.org/fau/fd/FA00004947
Subject Headings: Landfill gases--Measurement., Odor control., Air quality management., Refuse and refuse disposal.
Format: Document (PDF)

Title: Tradable permits as a policy mechanism for greenhouse gas abatement.
Creator: Van Treese, Jeff., Harriet L. Wilkes Honors College
Abstract/Description: This paper examines permit trading as an instrument for greenhouse gas emission abatement and suggests that a cap and trade scheme is the lowest-cost option for achieving this goal. The paper examines relevant examples of emission trading within the United States, including the Acid Rain Program contained within the 1990 Clean Air Act, the Regional Greenhouse Gas Initiative, and the Chicago Climate Exchange. I address the circumstances, constraints, and degree of success of such programs in...
Show moreThis paper examines permit trading as an instrument for greenhouse gas emission abatement and suggests that a cap and trade scheme is the lowest-cost option for achieving this goal. The paper examines relevant examples of emission trading within the United States, including the Acid Rain Program contained within the 1990 Clean Air Act, the Regional Greenhouse Gas Initiative, and the Chicago Climate Exchange. I address the circumstances, constraints, and degree of success of such programs in relation to the Kyoto Protocol as well as other possible permit schemes at the national level within the United States. I contrast tradable permits with other forms of environmental abatement policy including command and control regulation and taxation. Finally, I analyze the effect of several variables including population and GDP on emissions growth and draws conclusions on what extent those variables play on shaping a domestic greenhouse gas trading program.
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Date Issued: 2007
PURL: http://purl.flvc.org/FAU/40973
Subject Headings: Emissions trading, Greenhouse gases, Environmental aspects, Climatic changes, Government policy, Greenhouse effect, Atmospheric, Environmental policy
Format: Document (PDF)

Title: Toward climate neutrality: greenhouse gas emissions inventory for Florida Atlantic University, 2005-2007.
Creator: Fannin, Sarah., Harriet L. Wilkes Honors College
Abstract/Description: Colleges and universities across the U.S. are working to reduce their environmental impact. Florida Atlantic University (FAU) has joined this nationwide collegiate effort through President Frank Brogan's recent signing of the American College and University Presidents Climate Commitment (ACUPCC). For my thesis, I estimate greenhouse gas emissions at FAU from 2005-2007 through collecting and analyzing data from different university departments and inputting this information into the Clean Air-...
Show moreColleges and universities across the U.S. are working to reduce their environmental impact. Florida Atlantic University (FAU) has joined this nationwide collegiate effort through President Frank Brogan's recent signing of the American College and University Presidents Climate Commitment (ACUPCC). For my thesis, I estimate greenhouse gas emissions at FAU from 2005-2007 through collecting and analyzing data from different university departments and inputting this information into the Clean Air- Cool Planet Campus Carbon Calculator for further computations. This greenhouse gas emission inventory for FAU meets the ACUPCC requirements. Using this greenhouse gas emission baseline, a comprehensive plan can be produced to monitor progress toward creating a sustainable and climate neutral FAU.
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Date Issued: 2008
PURL: http://purl.flvc.org/FAU/77664
Subject Headings: Greenhouse gases, Environmental aspects, Climate changes, Environmental aspects, Greenhouse effect, Atmospheric, Greenhouse gas mitigation
Format: Document (PDF)

Title: Understanding Variability of Biogenic Gas Fluxes from Peat Soils at High Temporal Resolution Using Capacitance Moisture Probes.
Creator: Munzenrieder, Cali, Comas, Xavier, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Geosciences
Abstract/Description: Peatlands act as carbon sinks while representing major sources of biogenic gases such as methane (CH4) and carbon dioxide (CO2), two potent greenhouse gases. Gas production and release in these peats soils are also influenced by overall warm temperatures and water table fluctuations due to the naturally shallow water table in the Florida Everglades. Releases of biogenic gases from Florida Everglades peat soils are not well understood and the temporal distribution and dynamics are uncertain....
Show morePeatlands act as carbon sinks while representing major sources of biogenic gases such as methane (CH4) and carbon dioxide (CO2), two potent greenhouse gases. Gas production and release in these peats soils are also influenced by overall warm temperatures and water table fluctuations due to the naturally shallow water table in the Florida Everglades. Releases of biogenic gases from Florida Everglades peat soils are not well understood and the temporal distribution and dynamics are uncertain. The general objective of this work was geared towards a methodological approach which aimed to examine the feasibility of capacitance moisture probes to investigate biogenic gas dynamics in various Florida Everglades peat soils at high temporal resolution. This work has implications for establishing capacitance moisture probes as a method to monitor gas dynamics in peat soils at high temporal resolution and better understanding patterns of gas build-up and release from peat soils in the Everglades.
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Date Issued: 2016
PURL: http://purl.flvc.org/fau/fd/FA00004700
Subject Headings: Everglades National Park (Fla.) -- Environmental conditions, Gas dynamics, Geographic information systems, Grassland ecology, Greenhouse gases, Wetland ecology
Format: Document (PDF)

FAU Theses and Dissertations (10)	+ -
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Greenhouse gases (4)	+ -
Landfill gases--Purification (3)	+ -
Environmental aspects (2)	+ -
Greenhouse effect, Atmospheric (2)	+ -
Plasma (Ionized gases) (2)	+ -

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United States (1)	+ -

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