Vermiculations In Painted Caves: New Inputs From Laboratory Experiments And Field Observations, 2021 Université Paris-Saclay, France
Vermiculations In Painted Caves: New Inputs From Laboratory Experiments And Field Observations, Perrine Freydier, Eric Weber, Jérôme Martin, Pierre-Yves Jeannin, Béatrice Guerrier, Frédéric Doumenc
International Journal of Speleology
Vermiculations are aggregates of small particles commonly found on cave walls. They are a major concern for the conservation of painted caves, as they can potentially alter valuable prehistoric cave paintings. A previous rheological study of fine sediment deposits on cave walls revealed that this material can undergo a solid-to-liquid transition triggered by variations in the chemical composition of the water film on the wall. Such a transition could occur at the origin of vermiculations by allowing the sediment to flow under low mechanical stress. In this work, we provide quantitative information on the conditions leading to this transition and ...
Novel Pilot Development Of A Closed-Loop Sustainable System Between Biogas Renewable Energy, Distilling, And Aquaculture By Vermiculture Of Stillage Wastes, Samuel C. Kessler
The Cardinal Edge
This study provides a mixed-methods approach in analyzing a potential closed-loop system between renewable biogas production from anaerobic digestion, vermiculture production, aquaculture production, and organic wastes with a particular focus on stillage wastes. Such system may hold significant promise for significantly reducing organic carbon and methane emissions from its components, and should be assessed for such. The 2021 IPCC report essentially identified methane reduction as the single fastest way to slow global warming (IPCC, 2021), making the study and implementation of methane-reducing systems and supportive policy for them critical. Knowledge gaps to implementing this system were qualitatively identified as disconnect ...
Utah - Perry Port Of Entry 2020, 2021 University of Denver
Utah - Perry Port Of Entry 2020, University Of Denver
FEAT Heavy-Duty Vehicle Measurements
No abstract provided.
Washington - Feat Bridge Based Train Measurements 2012, 2021 University of Puget Sound
Washington - Feat Bridge Based Train Measurements 2012, University Of Puget Sound
Non-Road Vehicle Data
No abstract provided.
Development Of An Lcms Analytical Method With Applicability To Determination Of Trace Level Explosives In Environmental Waters, 2021 The Graduate Center, City University of New York
Development Of An Lcms Analytical Method With Applicability To Determination Of Trace Level Explosives In Environmental Waters, Cristina I. Veresmortean
Dissertations, Theses, and Capstone Projects
Traces of explosives and their degradation products present in explosives contaminated sites from military sources, such as training facilities, impose a great concern over the public health and our eco-system. This work is centered around finding an efficient way to extraction of these chemicals from water samples and their analysis using advanced separation technology: LC-MS/MS Shimadzu Prominence 8050 and AB Sciex Trap 4000 LC-MS/MS. Different extraction methods will be proposed, along with chromatographic and mass spectroscopy method development. Dependent on the target analyte polarity, thermal degradation, solubility and type of matrix, an appropriate method of analysis will be ...
Modeling Vitexin And Isovitexin Flavones As Corrosion Inhibitors For Aluminium Metal, 2021 Department of Pure and Industrial Chemistry, Bayero University, Kano, Nigeria
Modeling Vitexin And Isovitexin Flavones As Corrosion Inhibitors For Aluminium Metal, Abdullahi Muhammad Ayuba, Umaru Umar
Karbala International Journal of Modern Science
Theoretically, the aluminium corrosion inhibitive performance of vitexin (VTX) and isovitexin (SVT) were evaluated with a view of establishing the mechanism of the inhibition process. Calculations which include the consideration of several global descriptors were studied to describe and correlate the reactivity of the molecules with the computed descriptors. First and second-order condensed Fukui functions were employed to analyze local reactivity parameters, while simulations involving the adsorbed molecules on Al (1 1 0) surface were conducted through quench dynamic simulations and the mechanism of physical adsorption was established with SVT relatively been a better inhibitor on Al surface than VTX.
To Know The Land With Hands And Minds: Negotiating Agricultural Knowledge In Late-Nineteenth-Century New England And Westphalia, Justus Hillebrand
Electronic Theses and Dissertations
Ever since the eighteenth century, experts have tried to tell farmers how to farm. The agricultural enlightenment in Europe marked the beginning of a long arc of new experts aiming to change agricultural knowledge and practice. This dissertation analyzes the pivotal period in the late nineteenth and early twentieth century in Germany and the United States when scientists, improvers, and market agents began to develop comprehensive ways to communicate agricultural innovation to farmers. In a functional approach to analyzing the negotiation of agricultural knowledge through its communication in things, words, and practices, this dissertation argues that the process of change ...
High Altitude Ballooning As A Platform For Measuring Ozone Uptake Over Agricultural Landscapes, 2021 Depaul University
High Altitude Ballooning As A Platform For Measuring Ozone Uptake Over Agricultural Landscapes, Thomas Sykora, Mark Potosnak
Measuring plant health is a key aspect in maximizing crop outputs. One often overlooked risk to crop fields is damage caused by stomatal ozone uptake; measuring this uptake is an important tool in understanding crop losses. Traditional methods for measuring plant ozone uptake are prohibitively expensive and rely on equipment that cannot easily be moved. Here, we propose high-altitude weather ballooning as a cost-effective alternative for measuring ozone uptake on a regional (~10 km) spatial scale. Ozonesounde data was obtained with weather balloons launched from the National Oceanic and Atmospheric Administration research station in Boulder, Colorado. This data was then ...
Impacts Of Oil And Gas Wastes On Landfill Leachate, Sewage Treatment Plants, And The Environment, 2021 Duquesne University
Impacts Of Oil And Gas Wastes On Landfill Leachate, Sewage Treatment Plants, And The Environment, Lauren Badertscher
Electronic Theses and Dissertations
Between January 2011 and March 2021 oil and gas wells in Pennsylvania produced
305,637,795 barrels of liquid waste and 6,992,957 tons of solid waste with the majority from
Marcellus Shale unconventional wells. This waste is not considered hazardous and over 89% of
the solid waste generated by unconventional and conventional oil and gas extraction has been
disposed of in landfills over the past decade. This study examined trends in the quantity of waste
produced and methods of disposal. Landfills accepting this waste were identified and their
general method of leachate treatment, using onsite facilities or offsite ...
Development Of Standard Operating Procedure With Modified Method To Quantify Benzene And Other Volatile Organic Compounds In Air Samples Using Gas Chromatography, 2021 Stephen F. Austin State University
Development Of Standard Operating Procedure With Modified Method To Quantify Benzene And Other Volatile Organic Compounds In Air Samples Using Gas Chromatography, Heather Hall
Electronic Theses and Dissertations
Stephen F. Austin State University (SFASU) Department of Environmental Science has recently invested in a gas chromatograph which can be used to analyze air samples for volatile organic compounds (VOCs) such as benzene, toluene, ethylbenzene, and xylenes (BTEX). The goal of this project was to develop a standard operating procedure (SOP) and modify the current method for the detection of VOCs associated with oil and gas drilling activity to accommodate the equipment and capabilities of SFASU Environmental Assessment Lab. This study aims to provide the framework for future research in air quality monitoring in the Eagle Ford Shale area. An ...
Laboratory Investigation Of Cyanide Evolution During Reaction Between Hypochlorous Acid And Glycine, 2021 California State University, San Bernardino
Laboratory Investigation Of Cyanide Evolution During Reaction Between Hypochlorous Acid And Glycine, Luz Chavez
Electronic Theses, Projects, and Dissertations
Fresh water treatment and conservation is of great importance in a society with a growing population. Ensuring water safety is a crucial task for water treatment plants. Advances in science and technology have allowed for the testing and study of potentially harmful side substances produced by water sanitation methods, one of those substances is cyanide (-CN). Previous research correlated a significant increase of cyanide levels in effluent water sanitized with a chlorination method. Research has also proposed a mechanism for the formation of cyanogen chloride (CNCl) from reactions with amino acids during the chlorination process. Flow injection analysis was chosen ...
Dissolved Organic Carbon And The Potential Role To Stream Acidity In The Great Smoky Mountains National Park, 2021 University of Tennessee
Dissolved Organic Carbon And The Potential Role To Stream Acidity In The Great Smoky Mountains National Park, Jason R. Brown
A substantial societal shift towards environmental awareness has focused research efforts on the impacts of pollution on natural landscapes. Improvements to pollutant regulations and technology have resulted in sizeable reductions of atmospheric deposition of anthropogenic acids, especially nitrates and sulfates, which has altered the role of these ions in the environment. As such, understandings of environmental chemistry dynamics have required regular updating.
Through the National Park Service Vital Signs monitoring program, increases in precipitation pH observed in Great Smoky Mountains National Park (GRSM) has been attributed to the reduction of inorganic acid concentrations. Unfortunately, these improvements have not been uniformly ...
Bioethanol Production: Glucose Testing And Quantification Using Dns Analysis And Addition Analytical Methods, Dineen Vogler, Barnabas Gikonyo
McNair Scholars Program
The search for alternative ways to create a more sustainable and environmentally friendly source of energy, other than fossil fuels, has been ongoing for many years. Particularly, the production of biofuels has become of interest. One effort has been through the creation of first-generation biofuels that curb greenhouse gas emissions, unlike fossil fuels. However, first generation biofuels lead to the increase in food prices which negatively impacts developing countries, as they use food sources to produce biofuel. To mitigate this issue, second generation biofuels are considered as a better alternative. Instead of hindering the food supply, second generation biofuels aim ...
Functionalized Ionic Liquids For Improved Co2 Hydrogenation Catalysts, 2021 Western Kentucky University
Functionalized Ionic Liquids For Improved Co2 Hydrogenation Catalysts, Amol Nanduji Jaybhaye
Masters Theses & Specialist Projects
Climate change is one of the biggest problems we are facing today, and anthropogenic greenhouse gases contribute significantly to it. Among greenhouse gasses, carbon dioxide emission is increased drastically and affecting majorly for increasing global temperature, and anything we can do to mitigate carbon dioxide emission will be helpful. A carbon dioxide hydrogenation reaction is a promising technique that can convert carbon dioxide into value-added chemicals, but the reaction rate is slow, and for that, we can use catalysts that will accelerate the reaction rate. Platinum-based nanoparticles have sparked research related to energy and environmental catalysts. Catalytic properties are depending ...
Enhancing Biochar As Scaffolding For Slow Release Of Nitrogen Fertilizer, 2021 Iowa State University
Enhancing Biochar As Scaffolding For Slow Release Of Nitrogen Fertilizer, Santanu Bakshi, Chumki Banik, David A. Laird, Ryan G. Smith, Robert C. Brown
Mechanical Engineering Publications
Nitrogen (N) is an essential macronutrient for plant growth; however, excessive use of N fertilizers and complexities of the N cycle in soil cause negative environmental impacts. This imposes several challenges in controlling the N availability timing and losses. The objective of this study was to develop a biochar-based slow-release fertilizer (SRF) to reduce N loss and increase N use efficiency in crop production. We provided a laboratory-based assessment of several H3PO4 activated (5 and 15%) biochar-based SRFs, produced from different combinations of biochar to urea (1:2, 1:3, 1:4, and 1:6), calcium lignosulfonate (5%), and paraffin ...
Isolation And Determination Of The Composition And Structural Components That Comprise Dissolved Organic Matter Using Normal Phase Liquid Chromatography, Jonathan A. Long Jr
University of New Orleans Theses and Dissertations
A comprehensive understanding of the reactivity associated with organic carbon is critical for recognizing the behavior of newly formed compounds in aquatic environments. In an effort to study the reactivity of complex mixtures, understanding the different processes affiliated with them are key. Understanding the reactivity associated with organic carbon can help to improve chromatographic separation. Using a combination of light and heavy crude oil, a separation procedure was developed to obtain a complete representation of the aromatic subfraction of the crude oil sample. The crude oils were separated into four distinct fractions based on the number of condensed aromatic rings ...
Modeling Biliary Polycyclic Aromatic Hydrocarbon Metabolites In Fish Using High Performance Liquid Chromatography With Fluorescence Detection, Principal Component Analysis, And Partial Least-Squares Analysis, 2021 Seattle Pacific University
Modeling Biliary Polycyclic Aromatic Hydrocarbon Metabolites In Fish Using High Performance Liquid Chromatography With Fluorescence Detection, Principal Component Analysis, And Partial Least-Squares Analysis, Joshua C. Padilla
Polycyclic aromatic hydrocarbons (PAHs) constitute a diverse class of highly toxic, ubiquitous environmental pollutants, and are thus of high interest in environmental monitoring and regulation. In this study, biliary samples of English soles Parophrys vetulus and smallmouth bass Micropterus dolomieu from Seattle waterways, and chum salmon Onchorynchus keta from the north Pacific Ocean were analyzed by high performance liquid chromatography with fluorescence detection (HPLC-FLD) to gauge PAH exposure. Samples were profiled in three broad molecular weight categories, to capture naphthalene-like (NAPH), phenanthrene-like (PHEN), and benzo[a]pyrene-like (BAP) metabolites. While quantification was not achieved for the chum salmon, the semi-quantitative ...
Water Purification And The Industries It Supports, 2021 Kennesaw State University
Water Purification And The Industries It Supports, Zeljka Zec, Kj Bell
Symposium of Student Scholars
Water Purification and the Industries It Supports
Zeljka Zec and KJ Bell
Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, Ga 30144
Clean and readily available water plays a crucial role in daily societal functions. The dynamic research of water purification involves the process of removing undesired chemical or biological contaminants that affect our use of fresh, consumable water. Depending on desired applications, purification quality is adjusted for use in medical settings, manufacturing, agriculture or personal use in households. Several methods and techniques have been used in the water purification process. Those processes are coagulation, flocculation, sedimentation, and filtration ...
Addressing Uncertainties Of Polychlorinated Biphenyls In Schools, 2021 The University of San Francisco
Addressing Uncertainties Of Polychlorinated Biphenyls In Schools, Alice Fan
Master's Projects and Capstones
Despite the potential neurological health deficits resulting from polychlorinated biphenyls, there is a lack of inhalation studies and regulations to protect students and teachers who are widely exposed to PCBs in older (1950 to 1979) schools. To estimate the extent of PCB detections in Los Angeles County schools, I applied a mathematical model to estimate the range of PCB detections in schools built between 1950 and 1984. I estimate the range of 17-34% PCB detections of open schools within Los Angeles County. Next, I reviewed exposure tools provided by the US EPA to bridge the uncertainty gaps between ingestion and ...
Scan Of The Advantage Of Using Biofuels, Ethanol, 2021 Kennesaw State University
Scan Of The Advantage Of Using Biofuels, Ethanol, Ana Carla Bueno
Symposium of Student Scholars
The environment is the big sink where all the human waste produced is deposited, mainly the pollutant gases from cars. It is inevitable not to contaminate drinking water, air, and all other ecosystems on the planet, and it was from these concerns that scientists began to develop alternative ways to mitigate the side effects of pollution. Currently, there are many strategies to soften the emission of pollutant gases into the atmosphere, and the biggest competitor of traditional fossil fuel is biofuels. The big challenge in the production of this type of fuel is the competition with the conventional fossil fuel ...