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Articles 38671 - 38700 of 38736
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Serving Their Communities By Preserving And Explaining Their Past: North Dakota County And Local Museums, Austin Allen Olson
Serving Their Communities By Preserving And Explaining Their Past: North Dakota County And Local Museums, Austin Allen Olson
Theses and Dissertations
Museum scholars and professionals continue to debate the purpose of museums and their relationships to the public. These contentious debates revolve around the institution’s roles within contemporary societal issues. The purpose of this study is to analyze the expanding roles of county and local museums in North Dakota have in their communities with the goal to understand how these museums can thrive and provide positive outcomes to the communities they serve. This thesis argues that local and county museums must undertake an active role in their local communities to continue to positively preserve and interpret the area’s history. Utilizing interviews …
A Data Driven Approach To Optimize Re-Fracturing Operations In The Williston Basin, Joshua Kroschel
A Data Driven Approach To Optimize Re-Fracturing Operations In The Williston Basin, Joshua Kroschel
Theses and Dissertations
Because of the recent paradigm shift focusing heavily on cost minimization, many operators are now re-developing existing assets at much lower costs instead of developing newly drilled wells. Although it may seem that the hydraulic fracturing process on a well would be easier after initial stimulation, this is not usually the case and is often more difficult. Being able to identify high margin effects of treatment parameters will help engineers design hydraulic fracturing treatments to minimize average STP (STP) and minimize costs. This research develops a feature engineered multivariate regression model that identifies several high margin areas for STP reduction. …
Determining The Optimum Ground Coal Bottom Ash Content For Sustainable Concrete Infrastructure, Sandip Poudel
Determining The Optimum Ground Coal Bottom Ash Content For Sustainable Concrete Infrastructure, Sandip Poudel
Theses and Dissertations
Cement production requires a high amount of energy and natural resources which has a high impact on the environment due to harmful gas emissions. Coal bottom ash (CBA) or Coal Boiler Slag (CBS) is the byproduct of coal-fired power plants that has pozzolanic properties. CBA or CBS can be mechanically ground to obtain Ground Coal Bottom Ash (GCBA) or Ground Coal Bottom Slag (GCBS). GCBA has the potential to replace cement in concrete which will reduce the waste in landfills, make economic benefits, preserve natural resources, and reduce health hazards. This research was performed to determine the optimum GCBA or …
Application Of Dynamic Techno-Economic Assessment: A Case Study In Rare Earth Element Extraction, Michael Ryder
Application Of Dynamic Techno-Economic Assessment: A Case Study In Rare Earth Element Extraction, Michael Ryder
Theses and Dissertations
Rare earth elements are critical materials for many technologies driving the energy industry forward. However, there is increasingly low security and lack of sustainability of current supplies. New sources and processing methods are needed and are being intensely investigated among U.S. energy leaders such as rare earth extraction from lignite coal in North Dakota. A critical need is to confirm the technological and economic viability of these approaches, aspects which are inherently interconnected, would benefit from a dynamic approach. The current approach is Techno-Economic Assessments (TEAs). TEAs evaluate the economics of the process and commercialization of the technology for viability …
Evaluating The Potential Of Wrought And Additively Manufactured Co-Cr Alloy For Prosthodontic Applications, Sudip Saha
Evaluating The Potential Of Wrought And Additively Manufactured Co-Cr Alloy For Prosthodontic Applications, Sudip Saha
Theses and Dissertations
Tribological analysis of metallic implants for orthodontics applications is a long-studied topic of research. The study covers human mouth anatomy, implant types, and major wear mechanisms, materials, and manufacturing techniques commonly used for dental implant materials. Common contributing factors to evaluate the mechanical performance of metal implants includes tribological behavior analysis in varying physiological conditions, material properties, corrosive responsiveness and manufacturing techniques. By conducting systematic experiments to cover these areas, this study aims to evaluate the performance of wrought and additively manufactured Co-Cr alloy for metallic implants for orthodontics applications.For the tribological test and corrosion experiments laboratory prepared artificial saliva …
Machine Learning And Data Mining To Validate The Prognostics And Predictive Breast Cancer Biomarkers On A Large Racially Diverse Population, Kalli Scheafer
Machine Learning And Data Mining To Validate The Prognostics And Predictive Breast Cancer Biomarkers On A Large Racially Diverse Population, Kalli Scheafer
Theses and Dissertations
Breast cancer biomarkers have great potential in providing clinicians more individualized information about the composition and outcomes of a patient’s breast cancer. However, many breast cancer biomarkers have not been evaluated on a large scale or in groups of patients with diverse characteristics, leading to difficulty in their translation to having an impact on patients. In this study, we compile a large, pooled breast cancer patient data cohort and evaluate breast cancer biomarkers on patients with diverse characteristics. Biomarkers are found to have varying expression patterns within the different breast cancer subtypes, validating the need to evaluate biomarkers on patient …
Exploration Of Early Career Teachers’ Perspectives On Preservice Training, Classroom Experiences, And Retention, Ashley Smalley
Exploration Of Early Career Teachers’ Perspectives On Preservice Training, Classroom Experiences, And Retention, Ashley Smalley
Theses and Dissertations
To promote the advancement of teacher recruitment, retention, and reduce attrition, K-12 teachers need to be fully prepared for the complex nature of being in a classroom, a classroom filled with students of all types. There is a unique nature to education and one must recognize the complexity of each individual student. The context of this study explores early career teachers’ perspectives on their preparedness for teaching. This research examines teachers’ perspectives in their first to fifth years of teaching who graduated from a North Dakota college. Each participant answered 13 questions regarding their perspectives on the preparation they received …
Studying Phase And Morphology Of Hydrocarbon Petrochemicals In Inorganic And Organic Microdroplets Using An Electrodynamic Balance, Fafa Tackie-Otoo
Studying Phase And Morphology Of Hydrocarbon Petrochemicals In Inorganic And Organic Microdroplets Using An Electrodynamic Balance, Fafa Tackie-Otoo
Theses and Dissertations
Wastewater from the petroleum industry contains large amounts of inorganic salts, hydrocarbons, mercaptans, oil and grease, phenols, and other organic chemicals. All these compounds can be found in highly complex solutions in the petroleum industry’s discharged water, and there is no common treatment method, which precludes reuse paths in other sectors such as irrigation of farmland. In order to reuse produced water, the water must be treated and these harmful chemicals must be removed. To treat and potentially reuse oily waste outside the energy sector, researchers typically use membrane technology, photocatalytic degradation, oxidation processes, electrochemical catalysis, and other methods. The …
Effect Of Deicing Chemicals And Fly Ash On Durability And Mechanical Properties Of Concrete, Joseph M. Useldinger-Hoefs
Effect Of Deicing Chemicals And Fly Ash On Durability And Mechanical Properties Of Concrete, Joseph M. Useldinger-Hoefs
Theses and Dissertations
Deicing chemicals, such as Sodium Chloride (NaCl), lowers the freezing point of water, resulting in less skidding, less hydroplaning, and more friction on roadways. NaCl has limitations regarding its deicing capabilities; therefore, a supplement should be used to decrease corrosion and aid in lowering the freezing point of water. Incorporating AMP in NaCl brine aids in bonding to the road’s surface and further lowers the water’s freezing point. This study was conducted to explore the optimum solution of AMP and Sodium Nitrite (NaNO2) and the impact 20% fly ash has on durability. Hardened properties were used to compare the impact …
Evaluating The Size Distribution Of Submicron Particles In Seawater, Yuanheng Xiong
Evaluating The Size Distribution Of Submicron Particles In Seawater, Yuanheng Xiong
Theses and Dissertations
Particles of sizes < 1 µm or submicron particles in seawater can contribute up to 60% of optical backscattering that reflect sunlight measured by remote sensors. Better understanding of their optical effect in ocean color requires the knowledge of their particle size distributions (PSDs). However, data on PSDs of submicron particles is limited. We examined an instrument, ViewSizer 3000, for its capability of measuring PSDs of submicron particles. The working theory of the instrument is to track the Brownian motion of particles and relate the diffusivity of each particle to its size. A Monte Carlo simulation was conducted to prove that the instrument can be used to quantify PSDs of naturally occurring particles. Calibrations in the lab using NIST-traceable microbeads indicates two corrections are needed: (1) the sample volume varies with the size of particles and (2) particles of sizes <250 nm cannot be estimated reliably due to their low signal-to-noise ratio. With the corrections, the instrument can resolve submicron particles of sizes >250 nm with a mean absolute error of 3.9% in size and 38% in concentration. The ViewSizer 3000 was deployed in two NASA EXPORTS field campaigns in the North Pacific Ocean in August 2018 and the North Atlantic Ocean in May 2021. A total of 373 water samples were collected from 5 m to 500 m and measured in the ship’s lab for their PSDs. The PSDs of submicron particles at different depths and waters exhibit up to 3 orders of magnitude variations at each size bin, with the mean concentration in NA 30% greater than that …
The Design And Preparation Of High-Performance Silicon/Carbon Composite Anode For Lithium-Ion Batteries, Xin Zhang
Theses and Dissertations
The increasing demand for high-performance energy storage devices has driven extensive research into developing advanced lithium-ion batteries (LIBs) for various applications, including electric vehicles, portable electronics, and grid energy storage. Anode materials play a critical role in determining the overall performance of LIBs. In this dissertation, the investigation of silicon-based anode materials synthesis, characterization, and electrochemical performance was conducted for high-performance lithium-ion battery (LIB) applications. Four projects (Chapter 3 through 6) will be included in this dissertation. Chapter one includes the background and motivation of developing high-performance anode material for LIBs, followed by the hypothesis, scope of work, and significance …
Analysis, Development And Design For Early Fault Detection And Fire Safety In Lithium-Ion Battery Technology, Daniel Kelly Boakye Danquah
Analysis, Development And Design For Early Fault Detection And Fire Safety In Lithium-Ion Battery Technology, Daniel Kelly Boakye Danquah
Theses and Dissertations
Energy storage technologies in its natural form play a key role in the electrical infrastructure, renewable and mobility industry. This form includes the material nomenclature for cell. technology, battery module design, Battery enclosure system design, control, and communication strategy, chemistry profile of various cell technologies, formation and formfactors of cell structure, electrical and mechanical properties of a lithium-ion cell, behavior of the cell under high voltage, low voltage, elevated temperature and lower temperature, multiple charging of a lithium-ion batteries. Energy storage industry is growing rapidly, and the industry is experiencing an unprecedented safety concern and issues in terms of fire …
A Wrf-Chem Air Pollution Modeling Study Over The Northern Plains, Carlos Javier Bucaram
A Wrf-Chem Air Pollution Modeling Study Over The Northern Plains, Carlos Javier Bucaram
Theses and Dissertations
Oil and gas production in the Bakken region increased dramatically more than a decade ago. In my first analysis, a WRF-Chem modeling study of the Northern Great Plains was conducted for a July 2010 baseline scenario prior to the largest of these production increases. Simulations using the RACM-MADE/SORGAM, CBMZ-MOSAIC, and MOZART-MOSAIC chemistry-aerosol mechanisms were compared to each other and against ground level observations. All three gas-aerosol modules produced similar prediction results for O3 and NO2, with moderate correlation to hourly measurements and monthly average values overpredicted by 20% for O3 and underpredicted by 5% for NO2. Monthly average PM2.5 concentrations …
3d Geologic Modeling Of Rare Earth Element Concentrations In Lignite Coal, Ian Kelly Feole
3d Geologic Modeling Of Rare Earth Element Concentrations In Lignite Coal, Ian Kelly Feole
Theses and Dissertations
Rare-earth elements (REE) are a set of elements with unique consumer applications that consist of the lanthanide series of elements which have the atomic numbers from 57 to 71 plus yttrium (Y) and scandium (Sc). Because of their unique properties, REEs are used in a wide array of consumer goods, energy system components, and military defense applications, but currently the United States is 100% import-reliant on these critical materials, and the REE supply chain is considered an issue of national security. Coal and coal by-products have been identified as a promising alternative resource and a focus of much recent research …
Continuous Decomposition Of Corn Stover-Derived Lignin To Valuable Products And Vanillin, Wyatt Larson
Continuous Decomposition Of Corn Stover-Derived Lignin To Valuable Products And Vanillin, Wyatt Larson
Theses and Dissertations
As the world moves away from fossil fuels, it is important to find new feedstock sources not only for fuels but also for chemicals and materials used every day that are also derived from fossil fuels. One potential source is lignin. Lignin is a large complex polymer with an abundance of cyclic groups making it a good candidate to produce chemicals that typically come from crude oil. However, the transformation of lignin into these compounds is a challenge, and processes to use lignin as a crude oil substitute have yet to be commercialized. Lignin is present in woods, grasses, and …
Community College Faculty Perceptions Of Open Educational Resources, Heather Ann Leavitt
Community College Faculty Perceptions Of Open Educational Resources, Heather Ann Leavitt
Theses and Dissertations
This study examined Open Educational Resources (OER) through a community college faculty perspective. Specifically, this study aimed to gain a deeper understanding of faculty motivations surrounding OER, faculty perceptions of OER’s influences on students, and pedagogical changes that faculty have made in response to OER. A qualitative research methodology was chosen, including semi-structured phenomenological interviews conducted with community college faculty members. The methodology was guided by activity theory. Faculty discussed their use of the 5 Rs (retain, reuse, revise, remix, redistribute) in practice, with revise being the most commonly used of the 5 Rs. Notably, the eight participants had mixed …
Graduates’ Perceptions Of Horizontal Mismatch: A Case Study Of A Marketing Program At A Regional Research University, Michael William Mills
Graduates’ Perceptions Of Horizontal Mismatch: A Case Study Of A Marketing Program At A Regional Research University, Michael William Mills
Theses and Dissertations
This qualitative case study utilizes the human capital theory to examine the influence of high impact career exploration and career-focused practices in a public, regional four-year institution. Literature shows that graduates who enter well-matched careers earn approximately 30 percent more than graduates who are not closely matched. In addition, well-matched employees lower recruitment and training costs for employers. The guiding notion of the paper is that students should not only be well-rounded but also be prepared to enter a career that is related to their field of study. Most students attend college to advance their career and economic outlook. This …
The Impacts Of Airborne Cloud Microphysical Instrumentation Mounting Location On Measurements Made During The Observations Of Aerosols And Clouds And Their Interactions (Oracles) Project, Joseph Robert O'Brien
The Impacts Of Airborne Cloud Microphysical Instrumentation Mounting Location On Measurements Made During The Observations Of Aerosols And Clouds And Their Interactions (Oracles) Project, Joseph Robert O'Brien
Theses and Dissertations
ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) was a five-year NASA investigation into the climate impacts of Southern Africa’s biomass burning aerosols. The University of North Dakota, in coordination with the Cooperative Institute for Severe and High-Impact Weather Research and Operations, the University of Oklahoma and University of Illinois at Urbana-Champaign integrated and operated a suite of in-situ cloud microphysical instrumentation into the NASA P-3 Orion aircraft to study aerosol-cloud interactions within this region. However, during the course of the individual ORACLES campaigns, the accuracy of the cloud microphysical observations were uncertain due to the mounting location of …
Carbon Capture Storage Implemented On Flexible Power Plants And Their Grid Impacts, Michael Kenneth Misch
Carbon Capture Storage Implemented On Flexible Power Plants And Their Grid Impacts, Michael Kenneth Misch
Theses and Dissertations
The energy grid is under a constant state of evolution from outside factors such as the rise ofrenewable energy in the form of solar and wind generation as well as competing with the changes in weather patterns from climate change leading to significant storms like the arctic event of 2022. Thermal power plants are greatly impacted by these changes. As a significant contributor of CO2 emissions, thermal power plants play an important role in emerging green technology policies to help the efforts of climate change. There is a significant cost associated with this change, however, as thermal plants are some …
The Impact Of Training Disruption On Commercial Certificate Attainment In Collegiate Aviation Programs, Jonathan Pearson
The Impact Of Training Disruption On Commercial Certificate Attainment In Collegiate Aviation Programs, Jonathan Pearson
Theses and Dissertations
The aviation industry is currently recovering from the COVID-19 pandemic and is forecast to continue to grow after returning to pre-pandemic levels of activity. As a result of retirements and growth, airlines are experiencing a large demand for qualified pilots. Collegiate aviation programs serve as a major source of training and recruitment, but it is unknown to what degree students in these programs were affected by the cessation of flight training during the pandemic. This study examined the impact of different variables, including training disruption, on commercial pilot certificate attainment and flight training hours in collegiate aviation flight training programs. …
Performance Evaluation Of Half-Bridge Inverter In 2-Level And Multilevel Topologies Using Bipolar Pwm And Low Frequency Switching, Yasha Pirani
Theses and Dissertations
Power Electronics switches incur power losses through conduction and transition states and impose harmonic losses on circuits due to their nonlinear properties. One way to optimize power efficiency is to reduce power loss by minimizing the number of circuit switches. This thesis proposes using a half-bridge inverter instead of the commonly used H-bridge in inverter-based topologies to lower the number of switches. To this end, two separate studies are conducted to evaluate the performance of half-bridge inverters in 2-level and multilevel topologies and compared against their respective H-bridge counterparts. For the first two comparative studies, simulation results for 2-level inverter …
A Hybrid Deep Neural Network Model To Forecast Day-Ahead Electricity Prices In The Usa Energy Market, Md. Saifur Rahman
A Hybrid Deep Neural Network Model To Forecast Day-Ahead Electricity Prices In The Usa Energy Market, Md. Saifur Rahman
Theses and Dissertations
Day-ahead electricity price forecasting is a critical research area that revolves around predicting prices in wholesale electricity markets. While significant progress has been made in energy price forecasting, the existence of a state-of-the-art method for accurately predicting prices in the USA energy market remains a topic of debate. The wholesale and retail markets in the USA greatly value improvements in the accuracy of electricity price forecasts. It is evident that renewable energy sources have become increasingly influential in the US power market, enhancing their effectiveness. However, existing forecasting models exhibit limitations, such as inadequate consideration of the impact of renewable …
Assessing Options For Reducing Greenhouse Gas Emissions And Increasing Energy Production From Municipal Solid Waste Utilizing Epa Models, Marcus Richburg
Assessing Options For Reducing Greenhouse Gas Emissions And Increasing Energy Production From Municipal Solid Waste Utilizing Epa Models, Marcus Richburg
Theses and Dissertations
The population of the planet surpassed the 8-billion-person mark in 2022, and the increase in population has brought about an increase in waste, both household and commercial. The municipal solid waste that is created is primarily stored in landfills, particularly in the United States. These landfills release methane and carbon dioxide into the atmosphere, creating what is known as anthropogenic emissions, due to their being caused by man-made issues. These two primary gases, along with others, make up greenhouse gases, and their reduction is key to potentially reducing or even reversing the greenhouse effect. Total municipal solid waste generation in …
Exploring Zinc Amido-Oxazolinate Complexes As Catalysts For Ring Opening Polymerization (Rop) And Ring Opening Co-Polymerization (Rocop), Muneer Shaik
Theses and Dissertations
This research aims to explore the potential of zinc amido-oxazolinate complexes as catalysts for ring opening polymerization (ROP) and ring opening copolymerization (ROCOP). ROP is a method for synthesizing polymers by opening cyclic monomers, while ROCOP involves using two different monomers to create a copolymer. The ROP of lactones is a well-established method for the synthesis of polyesters, whereas the ROCOP of epoxides and cyclic anhydrides is a more recent development. Zinc amido-oxazolinate complexes are a promising class of catalysts due to their tunable electronic properties and high reactivity. The catalytic activity of these complexes can be tuned by modifying …
Application Of Artificial Intelligence And Multi-Omics To Understand The Effect Of Heavy Metals Exposure On Human Health, Sonalika Singhal
Application Of Artificial Intelligence And Multi-Omics To Understand The Effect Of Heavy Metals Exposure On Human Health, Sonalika Singhal
Theses and Dissertations
IARC classified arsenic (iAs) as “carcinogenic to humans”, but despite the health consequences, there is no molecular signature available yet to predict when exposure may lead to the disease development. In this study, a three-step analysis was employed: (1) the gene expression profiles obtained from diverse arsenic-exposed populations were utilized to identify differentially expressed genes associated with arsenic exposure in human subjects, (2) the gene expression profiles induced by arsenic exposure in different myeloma cancer cell lines were used to define common genes and pathways altered by arsenic exposure,(3) the genetic profiles of human bladder cancer studies were used to …
Buckling Behavior Of Metallic Thin-Walled Stiffened Cylindrical Shells Under Static Loading, Fnu Tabish
Buckling Behavior Of Metallic Thin-Walled Stiffened Cylindrical Shells Under Static Loading, Fnu Tabish
Theses and Dissertations
This thesis aims to estimate and improve the buckling strength of the cylindrical storage tanks under static loadings. Initially, for the verification of the overall performance of the numerical modeling approach; a computational analysis was conducted to calculate the linear buckling behaviour of empty cylindrical shells with different H/D and D/t ratios using ANSYS workbench 2021. Results revealed that the FE models accurately predict static critical buckling stress which is mainly depends on the D/t ratio. The solution of the buckling analysis provides multiple buckling mode shapes and critically buckling load values. Those mode shapes (eigenvectors) can indicate the expected …
Real-Time Monitoring And Controlling Feedstock Properties Fluctuations In Solid Fuel-Fired Energy Conversion Systems, David John Stadem
Real-Time Monitoring And Controlling Feedstock Properties Fluctuations In Solid Fuel-Fired Energy Conversion Systems, David John Stadem
Theses and Dissertations
Fluctuations in feedstock properties significantly impact the reliability, efficiency, and emissions of energy conversion systems.The behavior of ash-forming impurities in solid feedstocks such as coal, biomass, petroleum coke, and municipal solid waste is a perennial challenge in energy generation. The transition to power plants with dynamic ramping capabilities as well as net-zero or negative carbon emissions is hampered in part by the impacts of ash-forming impurities on systems such as gasifiers, combustors, gas cleanup, and carbon capture systems. Many ash-related events that disrupt operations are caused by fluctuations in the properties of the feedstock. Online feedstock properties monitoring systems have …
Maximizing External Action With Information Provision Over Multiple Rounds In Online Social Networks, Masaaki Miyashita, Norihiko Shinomiya, Daisuke Kasamatsu, Genya Ishigaki
Maximizing External Action With Information Provision Over Multiple Rounds In Online Social Networks, Masaaki Miyashita, Norihiko Shinomiya, Daisuke Kasamatsu, Genya Ishigaki
Faculty Research, Scholarly, and Creative Activity
Online social networks have increased their impact on the real world, which motivates information senders to control the propagation process of information to promote particular actions of online users. However, the existing works on information provisioning seem to oversimplify the users? decision-making process that involves information reception, internal actions of social networks, and external actions of social networks. In particular, characterizing the best practices of information provisioning that promotes the users? external actions is a complex task due to the complexity of the propagation process in OSNs, even when the variation of information is limited. Therefore, we propose a new …
Algorithms And Their Affordances: How Crowdworkers Manage Algorithmic Scores In Online Labour Markets, Francesca Bellesia, Elisa Mattarelli, Fabiola Bertolotti
Algorithms And Their Affordances: How Crowdworkers Manage Algorithmic Scores In Online Labour Markets, Francesca Bellesia, Elisa Mattarelli, Fabiola Bertolotti
Faculty Research, Scholarly, and Creative Activity
On online labour platforms, algorithmic scores are used as indicators of freelancers' work quality and future performance. Recent studies underscore that, to achieve good scores and secure their presence on platforms, freelancers respond to algorithmic control in different ways. However, we argue, to fully understand how freelancers deal with algorithmic scores, we first need to investigate how they interpret scores and, more specifically, what scores can do for them, i.e., perceived algorithmic affordances and constraints. Our interviews and other qualitative data collected with knowledge intensive gig workers on a major platform allow us to explain how the perceived affordances of …
Establishing A Framework For The Ethical And Legal Use Of Web Scrapers By Cybercrime And Cybersecurity Researchers: Learnings From A Systematic Review Of Australian Research, Katie Logos, Russell Brewer, Colette Langos, Bryce Westlake
Establishing A Framework For The Ethical And Legal Use Of Web Scrapers By Cybercrime And Cybersecurity Researchers: Learnings From A Systematic Review Of Australian Research, Katie Logos, Russell Brewer, Colette Langos, Bryce Westlake
Faculty Research, Scholarly, and Creative Activity
The Internet has become an increasingly attractive location for collecting data about cyber threats, driven by the abundance of quality data available and accessible online. As such, researchers and practitioners have turned to automated data collection technologies (ADCT), including ‘web crawlers’ and ‘web scrapers’, to study these threats. The rapid proliferation of ADCT has meant directions for their ethical and legal operation have been slow to adapt, with no clear guidelines regulating their use for research. This article identifies the relevant ethical and legal frameworks guiding the deployment of ADCT in Australia for cybersecurity research. This is accomplished through a …