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Articles 1 - 12 of 12
Full-Text Articles in Engineering
Optimization Of Nanoscale Zero-Valent Iron For The Remediation Of Groundwater Contaminants, Andrew W. E. Mcpherson
Optimization Of Nanoscale Zero-Valent Iron For The Remediation Of Groundwater Contaminants, Andrew W. E. Mcpherson
Theses and Dissertations
Nanoscale zero-valent iron (nZVI) is an emerging tool for the remediation of groundwater contaminants. The nanoparticles are capable of reductively destroying or immobilizing a wide range of contaminants. Their small size results in a high surface area to mass ratio, making them much more reactive compared to their more-coarse predecessors. Small particle size also allows nZVI particles to be injected directly into contaminated areas via a well, limiting the above-ground footprint and allowing access to contaminated areas that are beyond the reach of some conventional methods. nZVI technology has the potential to facilitate remediation in difficult situations, improve remediation outcomes, …
Evaluation Of Municipal Wastewater Treatment Plant Activated Sludge For Biodegradation Of Propylene Glycol As An Aircraft Deicer, Justin D. Delorit
Evaluation Of Municipal Wastewater Treatment Plant Activated Sludge For Biodegradation Of Propylene Glycol As An Aircraft Deicer, Justin D. Delorit
Theses and Dissertations
Aircraft deicing fluid used at airport facilities is often collected for treatment or disposal in order to prevent serious ecological threats to nearby surface waters. This study investigated lab scale degradation of propylene glycol (PG), the active ingredient in a common aircraft deicing fluid, by way of a laboratory-scale sequencing batch reactor containing municipal waste water treatment facility activated sludge (AS) performing simultaneous organic carbon oxidation and nitrification. The ability of AS to remove PG was evaluated by studying the biodegradation and sorption characteristics of PG in an AS medium. The results indicate sorption may play a role in the …
Improving Effectiveness Of Monetary Weapon Systems In Afghanistan, Seth M. Lorimer
Improving Effectiveness Of Monetary Weapon Systems In Afghanistan, Seth M. Lorimer
Theses and Dissertations
Tenuous political and economic times call for increased oversight and improved results from military counterinsurgency programs in Afghanistan, programs that provide agile non-kinetic weapons, critical for commanders fighting in today's asymmetric battle space. This paper proposes a decision tool for construction projects executed under the Commanders Emergency Response Program, designed to meet the changing demands of fighting an amorphous insurgency among dynamic systems of stakeholders. The research first conducted a system analysis of the CERP project execution process identifying key findings addressing value adding inputs. The research then applies a Causal Chain, borrowed from the Emergency Management field to identify …
Biodegradation Of Organophosphate Chemical Warfare Agents By Activated Sludge, Steven J. Schuldt
Biodegradation Of Organophosphate Chemical Warfare Agents By Activated Sludge, Steven J. Schuldt
Theses and Dissertations
Organophosphates (OPs) have been widely used as Chemical Warfare Agents (CWAs) as well as pesticides since World War II and still remain a threat to national security. While efforts have been taken at military installations and civilian communities to secure these chemicals and prevent their misuse, a determined adversary could still obtain and deploy them to injure, kill, or instill terror. The lethal properties of this group of compounds are primarily owed to their irreversible inhibition of the enzyme acetyl cholinesterase (AChE) and thus may alter the human nervous system or affect the hormonal balance of children in particular. In …
Firm Fixed Price And Cost Plus Fixed Fee Construction Contracts In Iraq And Afghanistan, Lindsay M. Jaszkowiak
Firm Fixed Price And Cost Plus Fixed Fee Construction Contracts In Iraq And Afghanistan, Lindsay M. Jaszkowiak
Theses and Dissertations
Firm Fixed Price (FFP) and Cost Plus Fixed Fee (CPFF) contract types have been utilized the most for construction in the Iraq and Afghanistan theaters. Often construction occurs in contested regions that are known to be particularly challenging, unpredictable, and unstable. The objective of this study was to analyze the performance of these two contract types in the contingency environment, and to determine what internal and external factors influence contact success the most. First, the author evaluated existing construction performance data using bivariate analysis and analysis of variance to identify differences in contract type. Next, a quantitative/qualitative questionnaire was administered …
The Application Of Sensors On Guardrails For The Purpose Of Real Time Impact Detection, Matthew D. Sturtevant
The Application Of Sensors On Guardrails For The Purpose Of Real Time Impact Detection, Matthew D. Sturtevant
Theses and Dissertations
The United States roadway system has deteriorated over time due to its age, increasing delays in completing preventative maintenance, and the lack of timely repairs following damage to the infrastructure. Proper asset management drives the need for generalized methods to integrate new sensing capabilities into existing Intelligent Transportation Systems in a time efficient and cost effective manner. In this thesis, we present a methodology for the deployment of new sensors into an existing ITS system. The proposed methodology employs a three phase approach that incorporates data modeling, spatial analysis in Geographic Information Systems, and cost optimization to provide enhanced decision …
An Analysis Of Turnover Intentions: A Reexamination Of Air Force Civil Engineering Company Grade Officers, Joshua D. Connell
An Analysis Of Turnover Intentions: A Reexamination Of Air Force Civil Engineering Company Grade Officers, Joshua D. Connell
Theses and Dissertations
A potential retention problem is facing company grade officers (CGOs) in the Air Force Civil Engineer (CE) career field. This is due to the stress caused by a demanding workload experienced during a prolonged period of conflict (Iraq and Afghanistan), which is compounded by a reduction in force. The possibility of reduced retention is thus a concern for CE leadership. Based on past research, and the prior study conducted by Riddel (2010), a new model of turnover intentions was developed. The new model expands on Riddel's simplified model of turnover and attempts to focus on key factors that may help …
Analysis Of Leadership In Energy And Environmental Design® Construction In The Air Force, James M. Rozzoni
Analysis Of Leadership In Energy And Environmental Design® Construction In The Air Force, James M. Rozzoni
Theses and Dissertations
The Air Force uses the Leadership in Energy and Environmental Design (LEED) rating system as a third party verification system to ensure sustainable and resource-conscious facilities. The Federal Government has implemented several mandates in recent years that require certain milestones be met for energy reduction, water conservation, renewable energy use, and so forth. This research aims to determine how the Air Force has implemented LEED through credit analysis, and to better understand why LEED is being used in this way. Using a database of 172 military construction projects, the research evaluates the frequency of credit usage individually and by category. …
Turnover Intentions: A Quantitative Analysis Of Comments From Air Force Civil Engineering Company Grade Officers, Tj E. Gabrielson
Turnover Intentions: A Quantitative Analysis Of Comments From Air Force Civil Engineering Company Grade Officers, Tj E. Gabrielson
Theses and Dissertations
Voluntary turnover is a concern for the military and many other organizations from a financial and performance standpoint. This study applied grounded theory to code and network comments provided by CE officers in 2010. The results of this study found the most influential construct that predicts turnover intentions to be the relationship of OPSTEMPO influencing interrole conflict. This conflict is increased by the workload at home station due to under manning within CE. OPSTEMPO is an important aspect of a military member's decision to stay or leave the service because it was found to interact with a multitude of other …
Asset Management: Roof Maintenance And Facility Energy Retrofits, Joseph P. Dirosario
Asset Management: Roof Maintenance And Facility Energy Retrofits, Joseph P. Dirosario
Theses and Dissertations
The United States Air Force (USAF) needs aggressive new techniques to compliment its asset management of its real estate portfolio. Air Force officials are experiencing budget cuts that have led to degraded facility infrastructure. Two areas of operations in which there are opportunities to improve the asset management of Air Force facilities are roof maintenance and energy retrofits. Information obtained via a geospatial information systems analysis revealed that the current state of the rooftop maintenance program was deficient and supported strategic sourcing as a potential solution to the program's deficiencies. In addition, two methodologies were created to gauge the effectiveness …
Understanding The Impact Of Bead Type On Paint And Thermoplastic Pavement Markings, Joshua D. Hollingsworth
Understanding The Impact Of Bead Type On Paint And Thermoplastic Pavement Markings, Joshua D. Hollingsworth
Theses and Dissertations
Each year the United States spends approximately two billion dollars maintaining pavement markings. In addition, an impending Federal policy establishing a minimum retro-reflectivity value for pavement markings has driven asset managers to develop performance models to effectively and efficiently manage these high quantity, low cost assets. Research over the past decade has sought to identify and understand the many factors influencing pavement marking degradation. Despite the fact that reflective glass beads are foundational to pavement marking retro-reflectivity, little research has specifically considered the impacts of bead type. The purpose of this study is to quantify the impact that bead type …
Maintenance Operations Degradation Of Airfield Pavement Markings, John C. Jaszkowiak
Maintenance Operations Degradation Of Airfield Pavement Markings, John C. Jaszkowiak
Theses and Dissertations
Pavement markings are an essential element in the navigational aids subsystem for any airfield. Most airfields still use waterborne paint as the primary marking material, although there are other materials in use on roadways that airfield managers could use to save time and money. An airfield experiences a host of maintenance operations that cause degradation of the pavement markings. Of particular concern are rubber removal operations, sweeping operations, and snowplowing operations. This research focuses on chemical rubber removal operations and sweeping operations. The study evaluates waterborne paint markings and thermoplastic marking strips to determine if these marking materials perform differently …