Engineering Commons^™

Cellulose Ester As Membranes For Controlled Release Fertilizer’S, Muhammed Salman Fajis

USF Tampa Graduate Theses and Dissertations

Growing environmental pollution and non-sustainable materials has escalated the need for research in sustainable practices for many areas including crop production and fertilization. The conventional coating for the controlled-release fertilizers (CRFs) is non-biodegradable. Hence, the development of novel biodegradable coatings for fertilizer prills has emerged as an important area of study. In this thesis, conducting synthesis and application of cellulose esters (biomass membrane) as an encapsulation for the controlled release fertilizers. Therefore, the coating would be effective for a controlled release of nutrients to the crops by sustaining nature. Here, synthesized biodegradable cellulose esters by 8 and 16-carbon fatty acids …

Wastewater Treatment Using Encapsulated Chabazite In Polyvinyl Alcohol-Sodium Alginate Hydrogel Biofilm Carriers, Susieanna Nevada Persaud

USF Tampa Graduate Theses and Dissertations

Nitrogen discharge from wastewater is a global issue and with increased urbanization as well as industrialization, it has become even more essential to develop more efficient wastewater treatment systems. The dominant form of nitrogen in wastewater is ammonium. Biological oxidation of ammonium to nitrite and nitrate is the first step in biological nitrogen removal processes. If left untreated, nitrogen can cause toxicity to aquatic life, unsafe changes in water quality, and eutrophication.

Biofilm carriers can help to improve the efficiency of traditional activated sludge wastewater treatment systems by reducing operating costs and reducing hydraulic retention time. Biofilm carriers also promote …

Impact Of Zn And W Doping Levels On Properties Of Thermochromic Vo2-Based Thin Films, Haji F. Haji, Margaret E. Samiji, Nuru R. Mlyuka

Tanzania Journal of Science

DC magnetron sputtering at a substrate temperature of 425 °C was used to successfully deposit W/Zn-doped VO2 thin films on soda lime glass (SLG) substrates. The aim was to investigate the influence of Zn doping levels on the transition temperature ( ), luminous transmittance (Tlum) and solar transmittance modulation (ΔTsol) of VO2-based thin films. UV/VIS/NIR spectrometer, X-ray Diffraction (XRD), Atomic Force Microscope (AFM), and Rutherford Backscattering Spectroscopy (RBS) were used to characterise the thin films. It was revealed that W/Zn co-doped VO2 thin films with ~ 10.8 at.% Zn showed a luminous transmittance of ~ 40.4%, with excellent solar transmittance …

Notes For Contributors, Space And Defense

Space and Defense

No abstract provided.

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, 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, 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, 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, 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.

Editor's Note Volume 11 No. 1, Damon Coletta

Space and Defense

No abstract provided.

Table Of Contents Volume 11 No. 1, Space And Defense

Space and Defense

No abstract provided.

Front Matter Volume 11 No. 1, Space And Defense

Space and Defense

No abstract provided.

Notes For Contributors, Space And Defense

Space and Defense

No abstract provided.

Book Review: The Physics Of Wall Street: A Brief History Of Predicting The Unpredictable By James Owen Weatherall, Brian M. Kruchkow

Space and Defense

A USAFA graduate comments on predicting the unpredictable when surveying new spaces at the frontiers of defense policy.

James Owen Weatherall’s book about the robust interplay of Wall Street and physics is a captivating romp about select physicists as well as a lesson on how finance both succeeds and falls short when it applies mathematical models to predict economic behavior.1 Such a book is a surprising candidate for a review in Space and Defense. Yet the ideas Weatherall presents are innovative, and they offer a framework for thinking about the problems with which this journal is concerned. In fact, The …

Cadet Voice: Hypersonic Weapons' Effect On Stragetic Stability, Darren Sency

Space and Defense

Initial exploration of the relationship between new technologies and strategic stability finds that hypersonic weapons, regardless of which power deploys them, first, could raise the probability of nuclear war.

Managing Criminalized Power Structures: The Predominant Spoilers Of Peace Processes, Michael Dziedzic

Space and Defense

Criminalized Power Structures (CPS) exploit illicit wealth acquisition to usurp political power and constitute a leading source of obstruction when the international community intervenes in states struggling to emerge from civil conflict. Structures operating outside domestic or international law may constitute a crucial barrier or spoiler for UN and coalition peace operations. This held true in the post-Cold War interregnum before 9/11 and is likely to continue for stabilization operations, regardless of outcomes from enormous international security investments in Afghanistan and Iraq. By understanding the different types of spoilers acting across cases, the United States and partners in the international …

Legislating For Humanity's Next Step: Cultivating A Legal Framework For The Mining Of Celestial Bodies, Joseph Crombie

Space and Defense

Rapid expansion in the space sector by state and private sector actors highlights the need for a new legal regulatory framework, particularly regarding property rights. The exploitation of space-based resources through the mining of asteroids is currently subject to a cold-war era international agreement that did not include clear consideration about how future off-world commercial exploitation might be regulated or property rights assigned. This article explores two empirical examples, the International Seabed Authority and the International Telecommunication Union, to determine whether they provide useful models of a future international legal framework for off-world property rights.

The Russian Sapce Sector: Adaptation, Retrenchment, And Stagnation, Bruce Mcclintock

Space and Defense

Senior Leader Essay

Since the collapse of the Soviet Union, Russia focused on its public space sector and consciously chose not to cultivate competitive, private space companies. Russia’s overall space enterprise is now in systemic crisis due to multiple factors and, despite positive rhetoric from the government and with the partial exception of national security space capabilities, faces yet another generation of stagnation.

Editor's Note Volume 10 No.1, Damon Coletta

Space and Defense

No abstract provided.

Table Of Contents Volume 10 No.1, Space And Defense

Space and Defense

No abstract provided.

Front Matter Volume 10 No.1, Space And Defense

Space and Defense

No abstract provided.

Notes For The Contributors, Space And Defense

Space and Defense

No abstract provided.

Book Review: Tom Nichols, The Death Of Expertise: The Campaign Against Established Knowledge And Why It Matters (Ny: Oxford University Press, 2017) 252 Pp., Damon Coletta

Space and Defense

This review is dedicated to Lt Gen (ret.) Brent Scowcroft, twice National Security Advisor and one-time head of the Department of Political Science, U.S. Air Force Academy. If he is looking down on our work today, we hope he liked this book, Death of Expertise, by a much admired Naval War College professor and enjoyed our department’s enthusiasm for participating in the conversation. Thank you, Gen Scowcroft (1925-2020).

Naval War College professor Tom Nichols built upon his popular essay in the Atlantic to deliver a blunt warning.1 After a venomous election in 2016 that swept the incumbent party from power, …

Cadet Voice: Extended Deterrence And Resilience In The Baltic States, Liam J. Connolly

Space and Defense

The following USAFA cadet independent study was supported by the Academy’s Nuclear Weapons & Strategy minor and the Cadet Summer Language Immersion Program to Lithuania. With minor formatting changes, the paper here appears as submitted to the USSTRATCOM Larry D. Welch Writing Award and the summer Deterrence Symposium (Omaha, NE), July 31-Aug. 1, 2019, where it won junior division, first place.

Since the end of the Second World War the United States has practiced extended deterrence as a means of resisting Russian expansion and aggression. In Europe, the US has done this with the support of the North Atlantic Treaty …

Cadet Voice: Artificial Intelligence And Stability In Nuclear Crises, Marshall D. Foster

Space and Defense

The following USAFA cadet independent study, with the exception of minor grammatical corrections, is produced as presented at the winter conference of the Project on Nuclear Issues (PONI), Center for Strategic and International Studies, Washington, D.C., Dec. 11, 2019 (https://www.csis.org/events/poni- 2019-winter-conference).

Technological advances in artificial intelligence (AI) by the United States, China and Russia jeopardize the longstanding nuclear peace that the world has enjoyed since the end of the Cold War.1 The desire to obtain AI capabilities for the purpose of strengthening defense and security postures could spur a new arms race among these powerful nuclear states, and the United …

Deterrence In Cyberspace: A Game-Theoretic Approach, Abderrahman Sokri

Space and Defense

This novel application of the Stackelberg leader-follower game from economic theory illuminates situational constraints that point to a sweet spot, an optimal level of investment in cyber defense, for deterrence by denial.

Deterrence is a form of persuasion intended to manipulate the cost-benefit analysis of would-be attackers and convince them that the cost of taking an action against the defender outweighs its potential benefit (Brantly, 2018; Wilner, 2017).1 It is the prevention (of a target) from committing unwanted behavior by fear of the consequences (United States (US) Department of Defense (DoD), 2008; Taipale, 2010). Deterrence differs from compellence by focusing …

Duffer's Drift And Space Operations, Roger Wortman

Space and Defense

Defence of Duffer’s Drift, a popular Boer War tale among British infantry officers, teaches lessons for the future of space operations.

Published in the early 20th Century, The Defence of Duffer's Drift is a work of fiction written as an educational tool for small unit leaders. The novella outlines the experiences for a young lieutenant and his tumultuous path to success when charge with defending key terrain. Told through a series of dreams, Duffer's Drift provides multiple tactical lessons through and iterative process, each building on the previous sequence. The officer fails multiple times while learning from various mistakes while …

As Delivered Remarks General John E. Hyten, John E. Hyten

Space and Defense

Senior Leader Voice

…I always thought, many times as I look back, if life would have been different if I’d gone to the Air Force Academy because one of the big advantages you guys are about to experience as you go into the world, into the United States Air Force, is that you will have a support structure built in from the day you come into the service. You will have this group of people that you had a common experience with for your four years. As you go through that structure you will have that common bond that will …

Editor's Note Vol. 12 No. 1, Damon Coletta

Space and Defense

No abstract provided.

Table Of Contents Vol. 12 No. 1, Space And Defense

Space and Defense

No abstract provided.