Embry-Riddle Aeronautical University
University of Tennessee, Knoxville
Santa Clara University
California Polytechnic State University, San Luis Obispo
Utah State University
Effects Of Simultaneous Co2 Addition To The Fuel And Oxidizer Streams On Soot Formation In Co-Flow Diffusion Ethylene Flame,
2023
Missouri University of Science and Technology
Effects Of Simultaneous Co2 Addition To The Fuel And Oxidizer Streams On Soot Formation In Co-Flow Diffusion Ethylene Flame, Yu Yang, Shu Zheng, Yuzhen He, Hao Liu, Ran Sui, Qiang Lu
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Soot formation in a co-flow diffusion ethylene flame with the addition of CO2 to the fuel (the CO2-F), oxidizer (the CO2-O), and fuel/oxidizer (the CO2-F/O) streams was numerically and experimentally investigated in this study. The effects of different CO2 addition ways on soot inception, soot condensation, H-abstraction-C2H2-addition (HACA) and oxidation by O2/OH processes, were quantitatively analyzed by introducing the integrated reaction rates over the whole computational domain. The simulated and experimental results showed that the CO2-F/O was the most effective in inhibiting soot formation …
The Role Of Atomic Layer Deposited Coatings On Lithium-Ion Transport: A Comprehensive Study,
2023
Missouri University of Science and Technology
The Role Of Atomic Layer Deposited Coatings On Lithium-Ion Transport: A Comprehensive Study, Yufang He, Hiep Pham, Xinhua Liang, Jonghyun Park
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The Use of Ultrathin Film Coatings Prepared through Atomic Layer Deposition (ALD) Has Become Widespread for Improving Lithium-Ion Diffusivity of Active Particles, Which Plays a Crucial Role in Determining the Rate Capability of Lithium-Ion Batteries (LIBs). in This Study, the Impact of ALD Coating Thickness on Ionic Diffusivity in CeO2-Coated LiMn2O4 (LMO) Cathode Particles is Comprehensively Investigated through First-Principles Calculations by Focusing on the Trade-Offs between the Physical Properties of the Film and its Impact on the Diffusivity of Ions. Our Findings Indicate that Several Physical Factors Affect the Diffusivity of the Coating, Including the Crystal-Amorphous Structure that Depends on …
Optimization Of High-Order Statistical Moment Combinations To Best Represent Spray Flow Particle Probability Density Functions,
2023
Florida Institute of Technology
Optimization Of High-Order Statistical Moment Combinations To Best Represent Spray Flow Particle Probability Density Functions, Amanda Lynn Myers
Theses and Dissertations
Characterizing spray flows has been an issue of interest for years, particularly in regards to fuel injection in engines. Droplet velocity and diameter, among other characteristics, are crucial to understanding spray flows. One approach for determining these quantities in a spray is using a statistical approach that solves for the moments of droplet characteristics as they evolve in space and time. A theoretical probability density function (PDF) can be formulated using various combinations of moments which evolve according to derived moment transport equations (thus evolving the PDF), using the principle of maximum entropy as closure to the system. Building upon …
Stability And Control Flight Testing Of A Modified Cessna 172,
2023
Florida Institute of Technology
Stability And Control Flight Testing Of A Modified Cessna 172, Tatiana Dirrigl Forbes
Theses and Dissertations
The Cessna 172N is a small, fixed-wing, single-engine aircraft. The modified Cessna 172N included a swapped engine to a Lycoming O-360-A4M, tuned exhaust, and variable timing ignition installed. Test flights on this aircraft were performed order to evaluate the stability and control characteristics of the Cessna 172N, and compare them with the regulations in the Title 14 CFR Part 23 Airworthiness Standards for Normal, Utility, Acrobatic, and Commuter Category Airplanes. The flight test consisted of four separate tests performed during a single flight, departing from and returning to Melbourne Orlando International airport (KMLB). The data was collected through static and …
Six-Degree-Of-Freedom Optimal Feedback Control Of Pinpoint Landing Using Deep Neural Networks,
2023
University of Florida
Six-Degree-Of-Freedom Optimal Feedback Control Of Pinpoint Landing Using Deep Neural Networks, Omkar S. Mulekar, Hancheol Cho, Riccardo Bevilacqua
Student Works
Machine learning regression techniques have shown success at feedback control to perform near-optimal pinpoint landings for low fidelity formulations (e.g. 3 degree-of-freedom). Trajectories from these low-fidelity landing formulations have been used in imitation learning techniques to train deep neural network policies to replicate these optimal landings in closed loop. This study details the development of a near-optimal, neural network feedback controller for a 6 degree-of-freedom pinpoint landing system. To model disturbances, the problem is cast as either a multi-phase optimal control problem or a triple single-phase optimal control problem to generate examples of optimal control through the presence of disturbances. …
Notes For Contributors,
2023
University of Nebraska at Omaha
Publisher’S Corner Space Policy’S Salt Moment,
2023
University of Nebraska at Omaha
Publisher’S Corner Space Policy’S Salt Moment, Roger G. Harrison
Space and Defense
The market for a leap forward in space arms control is open. Now, who’s buying? The United States is facing a fundamental decision about space policy which arises from a question: does our national interest in an ordered space environment trump our absolute insistence on a policy of freedom of action? Or is the looming threat of over-crowded orbits, frequency interference and debris – of contested, congested and competitive space – so pressing that we must accept some greater transparency for our national security space operations, even greater information sharing with China, Russia, and commercial space operators, and perhaps some …
Book Review Crowded Orbits: Conflict And Cooperation In Space By James Clay Moltz (Columbia University Press, 2014),
2023
University of Nebraska at Omaha
Book Review Crowded Orbits: Conflict And Cooperation In Space By James Clay Moltz (Columbia University Press, 2014), Deron Jackson
Space and Defense
A popular space primer serves both the policy and academic communities. Human beings have perceived outer space as infinite for centuries, and since the observations of Edwin Hubble in the 1920s, scientists have studied phenomena that suggest the universe itself is expanding. However, as the title of Clay Moltz’s most recent book points out, the region of space most important to the economic and physical security of residents on Earth is increasingly viewed as far from infinite.
Meeting Growth Challenges Of Mexico Aerospace: The Queretaro Cluster,
2023
Facultad Latinoamericana de Ciencias Sociales
Meeting Growth Challenges Of Mexico Aerospace: The Queretaro Cluster, Monica Casalet
Space and Defense
Growing the Aerospace sector in Mexico requires multilevel agreement between original equipment manufacturers (OEMs), including foreign companies, and national and sub-national governments to stimulate programs and instruments for sector growth. In addition, space for local learning must be cultivated within a process of production organized hierarchically and highly regulated on the international level. The case of the Queretaro cluster is important due to the density of networks created, extensive public-private collaboration, and the emergence of specialized institutions to train and shape highly skilled (professionals and technicians) in the aerospace industry. Ultimately, there remains an important vacuum to fill in the …
Brazil Space: Military Dependency And The Case Of The Geostationary Satellite Of Defense And Strategic Communications,
2023
Federal University of Pernambuco
Brazil Space: Military Dependency And The Case Of The Geostationary Satellite Of Defense And Strategic Communications, Gills Vilar Lopes
Space and Defense
In Brazil, there has been no transition model of space capabilities promoted by the military sphere (especially the Brazilian Air Force) for nurturing the civil one (Brazilian Space Agency). Drawing upon official documents and legislation as primary sources, the case study of the Geostationary Satellite of Defense and Strategic Communications (SGDC) is analyzed in light of the space strategic sector. Main factors that impede the PEB are related to military-technological dependence and poor resource management, with draconian budget cuts and projects canceled before having achieved realistic milestones.
Attack On The Brain: Neurowars And Neurowarfare,
2023
East Carolina University
Attack On The Brain: Neurowars And Neurowarfare, Armin Krishnan
Space and Defense
Is neurotechnology leading nation-states toward a new domain of war? Neuroscience is on the verge of deciphering the human brain. As a result, brains will become a part of the battlefield against which attacks will be directed. As neuroscientist James Giordano argued: “the brain is the next battlespace.” It is foreseeable that this will have tremendous implications for warfare and could amount to a true military revolution in the sense of military historian Williamson Murray: it would completely change the characteristics of conflict, as well as transform state and society.
Editor's Note Volume 9 No. 1,
2023
University of Nebraska at Omaha
Table Of Contents Volume 9 No. 1,
2023
University of Nebraska at Omaha
Table Of Contents Volume 9 No. 1, Space And Defense
Space and Defense
No abstract provided.
Front Matter Volume 9 No. 1,
2023
University of Nebraska at Omaha
Front Matter Volume 9 No. 1, Space And Defense
Space and Defense
No abstract provided.
Notes For Contributors,
2023
University of Nebraska at Omaha
Cadet Voice: A Curious Trinity: War, Media, And Public Opinion,
2023
United States Air Force
Cadet Voice: A Curious Trinity: War, Media, And Public Opinion, Laura Olson
Space and Defense
The following USAFA cadet Capstone project from spring 2017 won the Best Undergraduate Class Paper Award from the national Political Science honor society, Pi Sigma Alpha. The article appears, below, as submitted, with allowances for Space & Defense formatting.
August, 2012- President Obama drew a “Red Line” on chemical weapons use in Syria. Just over a year later, a UN report confirmed Syrian chemical use. Two words, spoken by the most powerful man in the world, generated massive media coverage. Around the world, news outlets and people everywhere looked for Washington’s reaction. Words are powerful because of the narrative they …
Arms Control And Deterrence In The Age Of Cross-Domain Coercion,
2023
University of Nebraska at Omaha
Arms Control And Deterrence In The Age Of Cross-Domain Coercion, Damon Coletta
Space and Defense
For deterrence, now, first seek arms control. The old relationship linking deterrence, defense, and arms control served U.S. policy makers for decades during the Cold War. It was manifest through the Spirit of Geneva (1955) and the Reykjavik Summit (1986). Much later, during the rise of cross-domain coercion and following Russia’s annexation of Crimea, the same idea reemerged in NATO’s Warsaw Communique (2016).
Building Beyond Samba And Soccer: Why Brazil Ventured A Nuclear Program,
2023
Brazilian Air Force Academy
Building Beyond Samba And Soccer: Why Brazil Ventured A Nuclear Program, Saint-Clair Lima Da Silva
Space and Defense
Contrary to conventional wisdom on Brazil as a case of nuclear proliferation, archival evidence indicates that, rather than geopolitical rivalry with Argentina, enduring desire for national autonomy—honor more than sword or shield—drove Brazil during the 1980s to master its own uranium enrichment cycle.
Communicating Cyber Consequences,
2023
United States Air Force Academy
Communicating Cyber Consequences, Timothy Goines
Space and Defense
More consideration ought to be accorded “loud” cyber weapons for signaling resolve in 21st century deterrence contests.
“Deterrence is at times a necessary or useful instrument of foreign policy, but the correct and prudent use of deterrence strategy is by no means self-evident or easily determined in all circumstances.”
In their seminal text, Alexander L. George and Richard Smoke thoroughly examined the topic of deterrence, tracing its historical roots and conducting case studies on its use. The product of this intense study was a formula that encapsulates the essence of deterrence theory. “In its simplest form, deterrence is merely a …
China's Military Space Strategy: A Dialectical Materialism Perspective,
2023
United States Air Force
China's Military Space Strategy: A Dialectical Materialism Perspective, Sam Rouleau
Space and Defense
China’s military space strategy accommodates in significant ways the Chinese Communist Party’s (CCP’s) ideological commitment to dialectical materialism. This Marxian commitment persists and manifests in China’s investment in space power despite the Party’s widely acknowledged development of state capitalism to guide China’s economy.
