Matching Items (1,058)
Filtering by
- Creators: Ravel, Maurice, 1875-1937
DescriptionAn analysis of police reform failure through prior literature and officer feedback.
ContributorsNelson, Wednesday Mae (Author) / Telep, Cody (Thesis director) / Wright, Kevin (Committee member) / School of Criminology and Criminal Justice (Contributor) / Department of Military Science (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
This thesis encompasses research performed in the focus area of structural health monitoring. More specifically, this research focuses on high velocity impact testing of carbon fiber reinforced structures, especially plates, and evaluating the damage post-impact. To this end, various non-destructive evaluation techniques such as ultrasonic C-scan testing and flash thermography were utilized for post-impact analysis. MATLAB algorithms were written and refined for the localization and quantification of damage in plates using data from sensors such as piezoelectric and fiber Bragg gratings sensors. Throughout the thesis, the general plate theory and laminate plate theory, the operations and optimization of the gas gun, and the theory used for the damage localization algorithms will be discussed. Additional quantifiable results are to come in future semesters of experimentation, but this thesis outlines the framework upon which all the research will continue to advance.
ContributorsMccrea, John Patrick (Author) / Chattopadhyay, Aditi (Thesis director) / Borkowski, Luke (Committee member) / Department of Military Science (Contributor) / Mechanical and Aerospace Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
This thesis encompasses research performed in the focus area of structural health monitoring. More specifically, this research focuses on high velocity impact testing of carbon fiber reinforced structures, especially plates, and evaluating the damage post-impact. To this end, various non-destructive evaluation techniques such as ultrasonic C-scan testing and flash thermography were utilized for post-impact analysis. MATLAB algorithms were written and refined for the localization and quantification of damage in plates using data from sensors such as piezoelectric and fiber Bragg gratings sensors. Throughout the thesis, the general plate theory and laminate plate theory, the operations and optimization of the gas gun, and the theory used for the damage localization algorithms will be discussed. Additional quantifiable results are to come in future semesters of experimentation, but this thesis outlines the framework upon which all the research will continue to advance.
ContributorsMccrea, John Patrick (Author) / Chattopadhyay, Aditi (Thesis director) / Borkowski, Luke (Committee member) / Barrett, The Honors College (Contributor) / Mechanical and Aerospace Engineering Program (Contributor) / Department of Military Science (Contributor)
Created2015-05
Description
Stability in Afghanistan has always been and will always be impossible to achieve, so long as Afghanistan remains the most corrupt country on earth, and so long as the nation's illicit drug trade continues to flourish unchecked. Longstanding conflict in Afghanistan has fostered an environment in which the interest of the nation's influential individuals tips more in favor of instability than in favor of creating a peaceful, stable country under the rule of law. Progress in securing the nation and defeating the Taliban insurgents will not win the counterinsurgency campaign alone. Dramatic political and economic reforms are required if the nation is to have a future after the withdrawal of ISAF troops and eventual reduction in foreign aid. Only permanent changes in behavior in the country can have permanent effects on the government, economy, and welfare of the population.
ContributorsPerry, Michael MacMillan (Author) / Roberts, Daniel (Thesis director) / Pagel, Bruce (Committee member) / Barrett, The Honors College (Contributor) / Department of Finance (Contributor) / W. P. Carey School of Business (Contributor) / Department of Military Science (Contributor)
Created2014-05
Description
Stability in Afghanistan has always been and will always be impossible to achieve, so long as Afghanistan remains the most corrupt country on earth, and so long as the nation's illicit drug trade continues to flourish unchecked. Longstanding conflict in Afghanistan has fostered an environment in which the interest of the nation's influential individuals tips more in favor of instability than in favor of creating a peaceful, stable country under the rule of law. Progress in securing the nation and defeating the Taliban insurgents will not win the counterinsurgency campaign alone. Dramatic political and economic reforms are required if the nation is to have a future after the withdrawal of ISAF troops and eventual reduction in foreign aid. Only permanent changes in behavior in the country can have permanent effects on the government, economy, and welfare of the population.
ContributorsPerry, Michael MacMillan (Author) / Roberts, Daniel (Thesis director) / Pagel, Bruce (Committee member) / Barrett, The Honors College (Contributor) / Department of Finance (Contributor) / W. P. Carey School of Business (Contributor) / Department of Military Science (Contributor)
Created2014-05
Description
Women have served in combat for centuries and in many cases, in nontraditional gender roles. Through the shroud of history, women have supported their country in times of conflict, from Sparta to Greece, and even to Persia. This case study reviews how women in combat impact gender inclusive policies in their regimes and society perception. We examine Kurdistan, Israel, and the United States because they all have been in major conflicts for the last few decades, and because there has been a significant female presence in their units on the frontlines. All three countries showed interesting effects when it came to gender equality: Kurdistan's female fighters were very active in liberating women from Sharia Law and implementing human rights in their territory, Israel's government supports their female soldiers and continues to push for more women to enter the combat arms units, and lastly, the United States' government has recently allowed women to have access to combat arms. All three countries have showed positive effects on their social constructions of women and both Israel and the US are in Social Watch's top 20 countries for gender equality. The social constructions are built on the norms of behaviors as well as perceptions that shape societal views. Kurdistan is not ranked in the Social Watch because it is not recognized by the international community; however, since Kurdistan is the region of Iraq, Afghanistan, Iran, and Turkey, all four of those countries are ranked very low on the scale for gender equality. All three countries have shown support for gender equality in one way or the other and the desire to push for acceptance of these modern ideas. There are still a lot of obstacles in the road, especially for Kurdistan because it is under pressure to reform his regime in order to gain the support of the West and satisfy the activism of its women fighters.
ContributorsJohnson, Alexis Kiana (Author) / Lennon, Tara (Thesis director) / Odom, Brianna (Committee member) / Department of Military Science (Contributor) / School of Politics and Global Studies (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
Description
This paper describes the research done to attempt to scale up thrusts produced by ionic wind thrusters, or "lifters" to magnitudes needed to power a 2 kg hobbyist remote-control airplane. It includes background information on the Biefeld-Brown effect and the thrust it produces, an experiment that attempted to prove that thrust can be scaled up from smaller ionic wind thrusters to larger scales, and two models predicting thruster geometries and power sources needed to reach these thrusts. An ionic wind thruster could not be created that would power the hobbyist remote as a high-voltage power source with voltage and power high enough could not be obtained. Thrusters were created for the experiment using balsa wood, aluminum foil, and thin copper wire, and were powered using a 30 kV transformer. The thrusters attempted to test for correlations between thrust, electrode length, and current; electric field strength, and thrust; and thrust optimization through opening up air flow through the collector electrode. The experiment was inconclusive as all the thrusters failed to produce measurable thrust. Further experimentation suggests the chief failure mode is likely conduction from the collector electrode to the nearby large conductive surface of the scale.
ContributorsHaug, Andrew James (Author) / White, Daniel (Thesis director) / Takahashi, Timothy (Committee member) / Middleton, James (Committee member) / Mechanical and Aerospace Engineering Program (Contributor) / Department of Military Science (Contributor) / Barrett, The Honors College (Contributor)
Created2017-12
Description
Advanced aerospace materials, including fiber reinforced polymer and ceramic matrix composites, are increasingly being used in critical and demanding applications, challenging the current damage prediction, detection, and quantification methodologies. Multiscale computational models offer key advantages over traditional analysis techniques and can provide the necessary capabilities for the development of a comprehensive virtual structural health monitoring (SHM) framework. Virtual SHM has the potential to drastically improve the design and analysis of aerospace components through coupling the complementary capabilities of models able to predict the initiation and propagation of damage under a wide range of loading and environmental scenarios, simulate interrogation methods for damage detection and quantification, and assess the health of a structure. A major component of the virtual SHM framework involves having micromechanics-based multiscale composite models that can provide the elastic, inelastic, and damage behavior of composite material systems under mechanical and thermal loading conditions and in the presence of microstructural complexity and variability. Quantification of the role geometric and architectural variability in the composite microstructure plays in the local and global composite behavior is essential to the development of appropriate scale-dependent unit cells and boundary conditions for the multiscale model. Once the composite behavior is predicted and variability effects assessed, wave-based SHM simulation models serve to provide knowledge on the probability of detection and characterization accuracy of damage present in the composite. The research presented in this dissertation provides the foundation for a comprehensive SHM framework for advanced aerospace materials. The developed models enhance the prediction of damage formation as a result of ceramic matrix composite processing, improve the understanding of the effects of architectural and geometric variability in polymer matrix composites, and provide an accurate and computational efficient modeling scheme for simulating guided wave excitation, propagation, interaction with damage, and sensing in a range of materials. The methodologies presented in this research represent substantial progress toward the development of an accurate and generalized virtual SHM framework.
ContributorsBorkowski, Luke (Author) / Chattopadhyay, Aditi (Thesis advisor) / Liu, Yongming (Committee member) / Mignolet, Marc (Committee member) / Papandreou-Suppappola, Antonia (Committee member) / Rajadas, John (Committee member) / Arizona State University (Publisher)
Created2015
Description
There is no doubt that inductive logic and inductive arguments are vital to the formation of scientific theories. This thesis questions the use of inductive inferences within the sciences. Specifically, it will examine various perspectives on David Hume's famed "problem of induction". Hume proposes that inductive inferences cannot be logically justified. Here we will explore several assessments of Hume's ideas and inductive logic in general. We will examine the views of philosophers and logicians: Karl Popper, Nelson Goodman, Larry Laudan, and Wesley Salmon. By comparing the radically different views of these philosophers it is possible to gain insight into the complex nature of making inductive inferences. First, Popper agrees with Hume that inductive inferences can never be logically justified. He maintains that the only way around the problem of induction is to rid science of inductive logic altogether. Goodman, on the other hand, believes induction can be justified in much the same way as deduction is justified. Goodman sets up a logical schema in which the rules of induction justify the particular inductive inferences. These general rules are then in turn justified by correct inferences. In this way, Goodman sets up an explication of inductive logic. Laudan and Salmon go on to provide more specific details about how the particular rules of induction should be constructed. Though both Laudan and Salmon are completing the logic schema of Goodman, their approaches are quite different. Laudan takes a more qualitative approach while Salmon uses the quantitative rules of probability to explicate induction. In the end, it can be concluded that it seems quite possible to justify inductive inferences, though there may be more than one possible set of rules of induction.
ContributorsFeddern, James William Edward (Author) / Creath, Richard (Thesis director) / Armendt, Brad (Committee member) / Department of Physics (Contributor) / Department of Military Science (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
Unmanned Aerial Vehicles, more commonly referred to as drones, have been a hot subject for the past few years. In the news, stories about drones cause the public alarm because of their seemingly increasing use. Problems have arisen with drones congesting airspace where manned aircraft fly, posing a huge threat to pilots and passengers of those aircraft. They have also caused concern of the public in matters of privacy. Drones are a go-anywhere and see-anything type of tool. They go where manned aircraft cannot, and where humans on the ground cannot. This video takes an in depth look at the issue of increasing civilian drone use, new regulations on users, categorizing types of drones, and possible solutions to the problems. Throughout the video, there will be three interviews. These interviews will be with experts in the field. The first person is Dr. Sarah Nilsson, Esq. She is a lawyer in drone law with her own practice. She has her PhD, CFI, and CFII as well as professional flying experience. The second person is Mr. Chris Andres. He is the Airport Administrator of Chandler Municipal Airport and offers a unique perspective on drones from an airport management standpoint. Lastly, the third person interviewed is a salesman at Viper Hobbies located in Mesa, AZ. He offers a perspective of drone use from the retail side, and also insight in FAA requirements of retailers and how retailers might offer education on regulation to the public.
ContributorsKataria, Sunil (Co-author) / Wren, Nicholas (Co-author) / Kimberly, Jimmy (Thesis director) / Nullmeyer, Robert (Committee member) / School of Life Sciences (Contributor) / Department of Military Science (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05