Engineering Commons^™

Design And Testing Of A Supercritical Carbon Dioxide Plasma Reactor, Gregory Belk

Theses and Dissertations

The objective of this project was to design, build, and test a plasma reactor capable of operating in the supercritical conditions. The reactor allows for the initiation of a plasma discharge in different fluids driven by a direct current (DC) power supply operating either in steady state mode or pulsing mode. The reactor was specifically designed for igniting plasmas within supercritical carbon dioxide, which has a pressure of 72.9 atm and 31.1 degrees Celsius.

A series of runs were conducted for varying pressures and inter-electrode separation, which allowed testing the operation regimes of the reactors. Finally, plasma experiments were conducted …

Automation Of Process Planning For Automated Fiber Placement, Joshua A. Halbritter

Theses and Dissertations

Process planning represents an essential stage of the Automated Fiber Placement (AFP) workflow. It develops useful and efficient machine processes based upon the working material, composite design, and manufacturing resources. The current state of process planning requires a high degree of interaction from the process planner and could greatly benefit from increased automation. Therefore, a list of key steps and functions are created to identify the more difficult and time-consuming phases of process planning. Additionally, a set of metrics must exist by which to evaluate the effectiveness of the manufactured laminate from the machine code created during the Process Planning …

Attribute-Based Cloud Data Integrity Auditing For Secure Outsourced Storage, Yong Yu, Yannan Li, Bo Yang, Willy Susilo, Guomin Yang, Jian Bai

Research Collection School Of Computing and Information Systems

Outsourced storage such as cloud storage can significantly reduce the burden of data management of data owners. Despite of a long list of merits of cloud storage, it triggers many security risks at the same time. Data integrity, one of the most burning challenges in secure cloud storage, is a fundamental and pivotal element in outsourcing services. Outsourced data auditing protocols enable a verifier to efficiently check the integrity of the outsourced files without downloading the entire file from the cloud, which can dramatically reduce the communication overhead between the cloud server and the verifier. Existing protocols are mostly based …

Two Can Play That Game: An Adversarial Evaluation Of A Cyber-Alert Inspection System, Ankit Shah, Arunesh Sinha, Rajesh Ganesan, Sushil Jajodia, Hasan Cam

Research Collection School Of Computing and Information Systems

Cyber-security is an important societal concern. Cyber-attacks have increased in numbers as well as in the extent of damage caused in every attack. Large organizations operate a Cyber Security Operation Center (CSOC), which forms the first line of cyber-defense. The inspection of cyber-alerts is a critical part of CSOC operations (defender or blue team). Recent work proposed a reinforcement learning (RL) based approach for the defender’s decision-making to prevent the cyber-alert queue length from growing large and overwhelming the defender. In this article, we perform a red team (adversarial) evaluation of this approach. With the recent attacks on learning-based decision-making …

Supercavitation Capabilities On A Submarine, Adam Vu

Georgia College Student Research Events

Submarines have shaped the way wars have been fought and have been influential in our understanding of fluid dynamics. In the past, supercavitation has been implemented to an idea that has been used to significantly increase the velocity of torpedoes in Chinese and Russian submarines. An example of this is the Russian VA-111 Shkval torpedo. The idea being that if your torpedo is expelling a gas out of the nose cone region, creating a boundary layer between the water and the torpedo, the torpedo will be facing much less resistance relative to when it was traveling in water alone. This …

Assessment Of An Automated Calibration Of The Sebal Algorithm To Estimate Dry-Season Surface-Energy Partitioning In A Forest–Savanna Transition In Brazil, Leonardo Laipelt, Anderson Luis Ruhoff, Ayan Santos Fleischmann, Rafael Henrique Bloedow Kayser, Elisa De Mello Kich, Humberto Ribeiro Da Rocha, Christopher Michael Usher Neale

Daugherty Water for Food Global Institute: Faculty Publications

Evapotranspiration (ET) provides a strong connection between surface energy and hydrological cycles. Advancements in remote sensing techniques have increased our understanding of energy and terrestrial water balances as well as the interaction between surface and atmosphere over large areas. In this study, we computed surface energy fluxes using the Surface Energy Balance Algorithm for Land (SEBAL) algorithm and a simplified adaptation of the CIMEC (Calibration using Inverse Modeling at Extreme Conditions) process for automated endmember selection. Our main purpose was to assess and compare the accuracy of the automated calibration of the SEBAL algorithm using two different sources of meteorological …

System Reliability Analysis Of The Scoliosis Disorder., Fatemeh Nouri, Seyed Hooman Ghasemi, Ji Yun Lee

Henry M. Rowan College of Engineering Departmental Research

BACKGROUND: Scoliosis is a spine abnormal deviation, which is an idiopathic disorder among children and adolescents. As a matter of the fact, distribution of loads on the patient's spine and load-carrying capacity of the vertebral column are both random variables. Therefore, the probabilistic approach may consider as a sophisticated method to deal with this problem.

METHOD: Reliability analysis is a probabilistic-based approach to consider the uncertainties of load and resistance of the vertebral column. The main contribution of this paper is to compare the reliability level of a normal and scoliosis spinal. To do so, the numerical analyses associated with …

A Micro-Optic Stalk (Muos) System To Model The Collective Migration Of Retinal Neuroblasts, Stephanie Zhang, Miles Markey, Caroline D. Pena, Tadmiri Venkatesh, Maribel Vasquez

Publications and Research

Contemporary regenerative therapies have introduced stem-like cells to replace damaged neurons in the visual system by recapitulating critical processes of eye development. The collective migration of neural stem cells is fundamental to retinogenesis and has been exceptionally well-studied using the fruit fly model of Drosophila Melanogaster. However, the migratory behavior of its retinal neuroblasts (RNBs) has been surprisingly understudied, despite being critical to retinal development in this invertebrate model. The current project developed a new microfluidic system to examine the collective migration of RNBs extracted from the developing visual system of Drosophila as a model for the collective motile processes …

Fibration Symmetries Uncover The Building Blocks Of Biological Networks, Flaviano Morone, Ian Leifer, Hernán A. Makse

Publications and Research

A major ambition of systems science is to uncover the building blocks of any biological network to decipher how cellular function emerges from their interactions. Here, we introduce a graph representation of the information flow in these networks as a set of input trees, one for each node, which contains all pathways along which information can be transmitted in the network. In this representation, we find remarkable symmetries in the input trees that deconstruct the network into functional building blocks called fibers. Nodes in a fiber have isomorphic input trees and thus process equivalent dynamics and synchronize their activity. Each …

Game Theory Approaches For Transportation Problems, Mahdi Takalloo

USF Tampa Graduate Theses and Dissertations

This dissertation considers three separate game theory problems in transportation. In the first problem, a combinatorial auction market has been proposed for fractional ownership of autonomous vehicles. The proposed combinatorial auction has two unique features. First, the items are continuous time slots defined by bidders and second, the spatial information of bidders has been incorporated so that sharing becomes a viable plan. A conflict-based formulation of the winner determination problem has been proposed, for which an effective solution approach based on a heuristic and a maximal-clique based relaxation has been presented. The second part of the dissertation examines a pessimistic …

Functional Object-Oriented Network: A Knowledge Representation For Service Robotics, David Andrés Paulius Ramos

USF Tampa Graduate Theses and Dissertations

In this dissertation, we discuss our work behind the development of the functional object-oriented network (abbreviated as FOON), a graphical knowledge representation for robotic manipulation and understanding of its own actions and (potentially) the intentions of humans in the household. Based on the theory of affordance, this representation captures manipulations and their effects on actions through the coupling of object and motion nodes as fundamental learning units known as functional units. The activities currently represented in FOON are cooking related, but this representation can be extended to other activities that involve manipulation of objects which result in observable changes of …

Analysis Of Training Programs For The Training Of Air Traffic Controllers For Determining The Field Of Digitization, Sabohat Shukurova, Z.Z. Shamsiev, A. Sterenharz

Technical science and innovation

The article emphasizes the high demands that are put forward to the professional knowledge and skills of air traffic controllers. Attention is drawn to ICAO's civil aviation training policy, which supports the human resource development strategies developed by Member States and the aviation community and provides access to a sufficient number of qualified and competent professionals. Based on this, the feasibility of research and improvement of the educational process of training air traffic controllers is substantiated. As a research method, the collection, processing and analysis of statistical data is used. As the subject of the study, educational programs for the …

Structurization And Modelling Of Technical Devices Of Hazardous Production Facilities, A.A. Kadirov, A.A. Kadirova, R.G. Abdeev

Technical science and innovation

Every year, the problem of industrial safety is becoming increasingly relevant. The effective industrial safety management system (ISMS) organization becomes especially important for nuclear energy, chemical, petrochemical, oil and gas, mining, metallurgical industries, coal mines and other industries, including enterprises with hazardous production facilities (HPF). Any violation of operating modes, unaccounted technological and operational defects can lead to serious consequences and accidents, accompanied by significant material costs and technological disasters. An important place among the problems of industrial safety is the problem of trouble-free operation of technical devices (units, machines and mechanisms, technical systems and complexes, technological equipment, instruments and …

Investigation Of Diesel Engine`S Working Process On Light Fuel, J.O. Khakimov, M.G. Shatrov, J.P. Turdiev

Technical science and innovation

The article considers the investigation results of the working process of diesel on light fuel. Consumption of natural resources in the form of hydrocarbon fuels, which is steadily increasing in transport, the number of rolling stock, and combustion products of motor fuels cause environmental pollution. It is shown that the transition to cheaper alternative types of fuel, by its characteristics, not inferior to liquid motor fuels, is one of the options to reduce operating costs and harmful emissions. The scheme of classification of gas systems of fuel transfer is presented: by design of the system of filling and storage of …

Final Report - Quantitative Bridge Inspection Ratings Using Autonomous Robotic Systems, Anil K. Agrawal, Jizhong Xiao

Project IM-2

Impact sounding has been recognized as an effective technique to detect delamination in concrete structures, such as concrete decks. An enormous amount of sounding data can be generated/collected by the autonomous inspection systems equipped with impactors and microphones. However, the main challenge in the practical application of this technology is the development of advanced data analysis approaches for identifying defects from impact sounding data. In this study, the empirical mode decomposition (EMD) analysis and power-spectral density (PSD) analysis are combined to extract useful features of sounding data generated by the impact hammer. It has been found that the EMD method …

Tunable Luminescence Of Rare Earth Doped Nanophosphors Via Adaptive Optical Properties Of Transition Metals, Pragathi Darapaneni

LSU Doctoral Dissertations

Over the past decades, the development of light-emitting diodes (LEDs) to produce a wide range of wavelengths has revolutionized the solid-state lighting industry due to their higher energy efficiency and operational lifetimes. These LEDs employ rare earth (RE) doped phosphors due to their stable emission wavelengths which can be amplified when sensitized by other RE dopants (Yb, Ce) or shell layer passivation. However, there has been a push to replace the RE elements in LEDs due to increased socioeconomic issues. One proposed alternative, transition metal (TM) dopants, is typically avoided due to their susceptibility to the local crystal environment resulting …

Turbulization Method Of Formation Of Highly Dispersed Droplets, Kh.D. Irisov, I.A. Ashirbekov, A.P. Kartoshkin, A.D. Abdazimov

Technical science and innovation

The article critically analyzes traditional methods of forming drops of defoliants and liquid chemicals. As an object of study, a sprayer with a perforated turbulator was selected, which ensures the formation of fine droplets on a short spraying torch. The degree of crushing of the working fluid, design parameters and operating modes of the proposed sprayer are investigated. Based on theoretical studies, analytical dependencies that reveal the physical properties of the sprayed liquid are analyzed, a description of the device and the principle of operation of the sprayer equipped with a perforated turbulator is given. The above analytical dependencies allowed …

Modern Model For Assessing The Efficiency Of Investments Attracted In Railway Transport, M.S. Saitkamolov, Z.T. Gaibnazarova, J. Cowie

Technical science and innovation

The article analyzes the modern model for evaluating the improvement of investment activity efficiency and provides conclusions on the level of development of the current state of railway transport in the Republic of Uzbekistan.

The economic effect of intensive investments is the equivalent of the costs and benefits of the difference between the result and the costs of achieving it.

The economic efficiency of intensive investments is defined as the ratio of investment costs to achieving a profitable result (economic effect).

The indicators characterizing the economic efficiency of intensive investments: the integrated effect, the need for additional financing, the internal …

Application The Basic Concepts And Laws Of Methamatics In The Field Of Modern Technology, N.N. Khudoyberdiyev, N.R. Tolipova

Technical science and innovation

This article we will discuss the mathematical formula and basic terms specific to engineering practitioners. Mathematics can solve a given problem quickly and easily in the form of a definition, even if it is used as an integral or matrix. In this article, it can be tried to apply the advanced portion of the mathematics matrix to the generation of electricity, i.e.by adding various additions and notes to the given circuit diagram, we can identify the current matrix.Several physical bodies, such as conical cushioning objects, were used to calculate the kinetic energy produced by rotating axes and to provide precise …

Reinforcing The Strength Of Gear Shaft Teeth With High Performance, N. Turakhodjaev, Sh. Chorshanbiev, N. Sadikova, J. Egamshukurov

Technical science and innovation

This article presents the results of the research on the development of the technology of increasing the service life of the sheets in the working conditions of the casting at the Central Repairs and Mechanical Plant at the Almalyk Mining and Metallurgy Refinery (CPC). One of the factors that led to the loss of Val schisternia was the study of the appearance, rupture and dental breakdown of the working surfaces, which led to increased production costs. Analyzes have shown that thermal processing and so-called thermal processing are recommended to increase the working capacity of the plants and factories at the …

Problems Of Coexistence Of Superconductivity And Magnetic Ordering Of Copper Sublattices In Yba2cu3-Xfexo7-X Ceramics, M.A. Ruzieva, Q.Kh. Bobomurodov, S.Q. Bobomurodov, R.A. Shokirov

Technical science and innovation

The article studies the problems of coexistence of superconductivity and magnetic ordering of copper sublattices in YBa₂Cu_3-xFe_xO_7-x ceramics.

It is known that in superconducting ceramics YBa₂Cu₃O_7-z with orthorhombic lattice as the oxygen content decreases, the transition temperature in superconducting state T_c decreases, and at z>0.6 superconductivity disappears, the lattice becomes tetragonal and at the same time, antiferromagnetic ordering of sublattices Cu (2) appears. The substitution in ceramics of YBa₂Cu₃O₇ part of copper atoms by iron atoms (i.e., the formation of a …

Improving The Performance Indicators Of Diesel Engines By Enhancing The Cooling System, O.O. Daminov, O.A. Khushnaev, A.I. Yangibaev, G.M. Kucharenok

Technical science and innovation

The article deals with the improvement of the performance of diesel engines by improving the cooling system. It is indicated that there is a number of problems that arise when converting an engine with spark ignition to natural gas. The increase of thermal stress of the engine is illustrated. As a result of researching of features of the parameters and characteristics of a gas-powered automobile engine and optimization of its temperature regime, a very actual scientific and practical task is determined. The engine with the spark ignition installed on the microbus working on the diesel and gas is presented. The …

Research Of Increasing The Reactivity Cotton Cellulose Intended For Chemistry, R.S. Sayfutdinov, U.D. Mukhitdinov, N.M. Eshpulatov

Technical science and innovation

The reactivity of cotton pulp during chemical processing is significantly lower compared to celluloses obtained from other cellulose-containing plants. Increasing the reactivity of cotton cellulose improves the quality of the products based on it, and also increases labor productivity.

The aim of this work is to study the possibility of replacing wood pulp imported from foreign countries with domestic cotton cellulose by increasing the reactivity of cotton cellulose for chemical processing, improving the quality of the resulting product and increasing the reaction rate.

In this work, we used methods for determining the composition and structure of cotton cellulose samples. The …

Final Report - Mobile-Manipulating Uavs For Sensor Installation, Bridge Inspection And Maintenance, Paul Oh, Blake Hament, Dongbin Kim

Project AS-1

A parallel mechanism and smart gripper were designed and mounted on a rotorcraft drone to act as a robotic arm and hand. This empowers the drone to perform aerial manipulation and execute bridge maintenance. Hosing, drilling, and epoxying serve as case studies to test-and-evaluation and verify-and-validate the design. The approach, tasks, and findings are presented and show that the case studies are realizable. Conclusions and recommendations point to employing haptics-based human-in-the-loop approaches that can increase the scope of repair work involved in bridge maintenance

Energy Conservation With Open Source Ad Blockers, Joshua M. Pearce

Michigan Tech Publications, Part 1

Internet-related electricity consumption is rising rapidly as global Internet users spend more than 6.5 h per day online. Open source ad blockers have the potential to reduce the time and thus electricity spent using computers by eliminating ads during Internet browsing and video streaming. In this study, three open source ad blockers are tested against a no-ad blocker control. Page load time is recorded for browsing a representative selection of the globally most-accessed websites, and the time spent watching ads on videos is quantified for both trending and non-trending content. The results show that page load time dropped 11% with …

Electrochemical Characterization Of Bromine Reduction To Tribromide In Individual Nitrobenzene-In-Water Emulsion Droplets, Liang Chang, Allen J. Bard

Faculty Scholarship

We report an electrochemical study of bromine reduction to tribromide in a single nitrobenzene (NB) droplet during a single collision event. The feasibility of this study is based on the favorable distribution of Br2 in NB rather than in water, which was demonstrated by voltammetry at the NB/water interface. The NB-in-water emulsions containing the ionic liquids trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)amide (ILPA) as the supporting electrolyte and sodium dodecyl sulfate (SDS) as the surfactant were prepared by a high-power ultrasonication. Its single droplet as an attoliter reactor, colliding on a 25 μm Pt UME, was monitored by chronoamperometry. The spike-type current transients of …

A Magnetic Γ-Fe2O3@Pani@Tio2 Core–Shell Nanocomposite For Arsenic Removal Via A Coupled Visible-Light-Induced Photocatalytic Oxidation– Adsorption Process†, Yuan Wang, Ping Zhang, Tian Zhang, Gang Xiang, Xinlong Wang, Simo Pehkonen, Shaojun Yuan

Department of Civil and Environmental Engineering: Faculty Publications

Arsenic polluted groundwater impairs human health and poses severe threats to drinking water supplies and ecosystems. Hence, an efficient method of simultaneous oxidation of As_(III) to As_(V), and removal of As_(V) from water has triggered increasing attention. In this study, a magnetic γ-Fe₂O₃ core–shell heterojunction nanocomposite was synthesized by means of hydrothermal crystallization of TiO₂ on the surface of the magnetic core–shell loaded with polyaniline (γ-Fe₂O₃@PANI@TiO₂). As an efficient photocatalyst coupled with adsorption, γ-Fe₂O₃@PANI@TiO₂ has a high light utilization and good …

The Participatory Approach For Waterfront Development In Mediterranean Countries. A Case Study Of Tripoli, Lebanon Waterfront, Sima El-Cheikh

Architecture and Planning Journal (APJ)

Public waterfronts are considered an important touristic target in coastal cities. The development of these spaces is affected by many social, economic and political issues. Public participation has been an important tool for communities to influence the making of public spaces. This research aims to develop a participatory approach for waterfront development in Mediterranean countries by studying people behavior and activities on public waterfronts and investigating the socio-economic factors that influence the usage of these areas. It is a bottom-up approach that analyzes how activities emerged from people needs. This research is a mixture of qualitative and quantitative approaches that …

Psychological And Physiological Effects Of Integrating Building Envelopes With Parametric Patterns In Office Workers, Ahmed Rashwan

Architecture and Planning Journal (APJ)

The building envelope has become an active element that allows the building to interact with the context of the surrounding environment. The integration of the envelope with architectural design patterns significantly affects the efficiency of the working environment space in the office buildings, where the resulting effect of this integration plays an important role in providing daylighting, visibility and view; which affects the comfort, performance and productivity of users in an office space. This research study aims to identify the physiological and psychological effects on office employees resulting from the integration of the building envelope and openings with one of …

Retrieving Memories Of Alexandria's Past By Revitalizing The Heritage Of Kom El-Dekka, Dina Nassar, Riham Ragheb

Architecture and Planning Journal (APJ)

Across the history of dealing with problems of increasing poverty in historic city centers of developing countries, studies have indicated high levels of demand and strong support for urban revitalization projects compared to other solutions such as; relocation or clearance and redevelopment. In such historic inner city centers, heritage can become a driver for development. Revitalization projects that demonstrate a concern for affordability for less wealthy citizens has become the best alternative to meet the needs of the citizens and small businesses in such deteriorated areas in old city centers. Preparing Alexandria for the 21st century has to take into …