Engineering Commons^™

Additively Manufactured On-Package Multipolar Antenna Systems For Harsh Communication Channels, Ramiro A. Ramirez-Hernandez

USF Tampa Graduate Theses and Dissertations

Four main aspects are studied and explored throughout this dissertation: (1) On-Package Multipolar antenna system design for integration with commercial wireless sensor nodes for machine-to-machine communication applications; (2) Development of a novel MMIC packaging process and subsequent antenna integration for chip-to-chip communication applications, (3) Design and characterization of additively manufactured lumped passive elements for integration with MMIC and hybrid circuits, (4) Design and characterization of antennas for on- and off-metal radio frequency identification (RFID) applications.

This work presents the design of different 3-D printed tripolar antenna systems operating at 2.4 GHz. The antennas are designed for integration with commercial wireless …

Destruction Of Moving Leukemia Cancer Cells In An Extra-Corporeal System Using Continuous Low-Frequency Ultrasound, Dhairya Raval

Theses - ALL

Low frequency ultrasound has been used for therapeutic purposes since a long time. It is non-invasive and thus application for medical purpose is easier. This method has been used in labs for preclinical in-vitro settings to observe the effects of low frequency ultrasound sound on neoplastic cells lines. The human leukemia cell lines are sonic sensitive and when exposed to various low frequencies of ultrasound for an amount of time, can cause their lysis and decrease their viability. The project focuses on using low frequency ultrasound on syringe pump mediated flowing leukemia cell lines and see how much their sonic …

Computational Analysis Of Developmental Disorders In Children, Siri Chandana Sambatur

Theses - ALL

Early developmental disorders are common in children between the ages of 3 through 17. These developmental disorders begin at early ages and affect the day-to-day activities of children. These disorders also impact the growth and lifestyle of children. Most of the time these developmental disorders co-exist in children. The main focus of our research lies in Autism Spectrum Disorder, Attention-Deficit/Hyperactivity Disorder, Deletion syndrome (22q) and their co-occurrences.

Most child psychologists and pediatricians diagnose these disorders in children through parent-based surveys. Our research uses three different parent-based reports: (1) Autism Diagnostic Interview (ADI), (2) Behavioral Assessment Schedule for Children (BASC), and …

Multimedia Transmission Over Wireless Networks: Performance Analysis And Optimal Resource Allocation, Chuang Ye

Dissertations - ALL

In recent years, multimedia applications such as video telephony, teleconferencing, and video streaming, which are delay sensitive and bandwidth intensive, have started to account for a significant portion of the data traffic in wireless networks. Such multimedia applications require certain quality of service (QoS) guarantees in terms of delay, packet loss, buffer underflows and overflows, and received multimedia quality. It is also important to note that such requirements need to be satisfied in the presence of limited wireless resources, such as power and bandwidth. Therefore, it is critical to conduct a rigorous performance analysis of multimedia transmissions over wireless networks …

Structure-Property Relationships In Novel Electrospun Composites For Advanced Applications, Melodie Lawton

Dissertations - ALL

Active polymeric materials that alter shape in response to an external stimulus offer unique avenues for the design and study of dynamic structures. This research focused on developing elastomeric polymer composites with multiple functionalities by exploring the design and properties for various applications including controlled drug delivery and shape memory.

The first part of this dissertation describes the fabrication and characterization of a soft, elastomeric polymeric composite with inherent shape memory properties capable of localized, long-term tunable drug release. In Chapter 2, the fibers were loaded with a hydrophilic drug model, Rhodamine B, and embedded within a siloxane-based elastomeric matrix …

Quantitative Measurement Of Cerebral Hemodynamics During Activation Of Auditory Cortex With Single- And Multi-Distance Near Infrared Spectroscopy, Penaz Parveen Sultana Mohammad

USF Tampa Graduate Theses and Dissertations

Functional Near Infrared Spectroscopy (fNIRS) is a safe, low-cost, non-invasive opti-cal technique to monitor focal changes in brain activity using neurovascular coupling and measurements of local tissue oxygenation, i.e., changes in concentrations of oxygenated hemoglobin (HbO) and deoxygenated hemoglobin (HbR)[42]. This thesis utilizes two fNIRS approaches to measure hemodynamic changes associated with functional stimulation of the human auditory cortex. The first approach, single-distance continuous wave NIRS (CW-NIRS) utilizes relatively simple instrumentation and the Modified-Beer Lambert (MBL) law to estimate activation induced changes in tissue oxygenation (∆CHbO and ∆CHbR)[17]. The second more complex approach, frequency domain NIRS (FD-NIRS), employs a photon …

Toward Verifiable Adaptive Control Systems: High-Performance And Robust Architectures, Benjamin Charles Gruenwald

USF Tampa Graduate Theses and Dissertations

In this dissertation, new model reference adaptive control architectures are presented with stability, performance, and robustness considerations, to address challenges related to the verification of adaptive control systems.

The challenges associated with the transient performance of adaptive control systems is first addressed using two new approaches that improve the transient performance. Specifically, the first approach is predicated on a novel controller architecture, which involves added terms in the update law entitled artificial basis functions. These terms are constructed through a gradient optimization procedure to minimize the system error between an uncertain dynamical system and a given reference model during the …

Impact Of Recirculating Nitrified Effluent On The Performance Of Passive Onsite Hybrid Adsorption And Biological Treatment Systems, Amulya Miriyala

USF Tampa Graduate Theses and Dissertations

Approximately 25% of households in the U.S. treat their wastewater onsite using conventional onsite wastewater treatment systems (OWTS). These systems typically include a septic tank or a series of septic tanks followed by a soil absorption system. They effectively remove biochemical oxygen demand (BOD), total suspended solids (TSS), fats and grease but are not designed to remove significant amounts of nitrogen. High nitrogen loading to coastal and ground waters can be dangerous to aquatic life and public health. Hence, there is a need for advanced onsite wastewater treatment systems that can effectively remove nitrogen. Making enhanced nitrogen removal for OWTS …

The Influence Of Heating And Cooling Rates On Tbc Failure In High Heat Flux Tests, Philip Howell, Uwe Rettig, Thorsten Steinkopff, Ramesh Subramanian, Andreas Wolff, Stefan Lampenscherf

Thermal Barrier Coatings V

High heat flux testing is a commonly used procedure to investigate TBC failure modes. Samples of TBC on superalloy are thermally cycled, with the TBC being heated and the superalloy subjected to forced cooling in order to induce a temperature gradient. Typically conditions are deliberately chosen to be more aggressive than in the engine in order to induce TBC delamination or complete spallation within a few days. We have developed a test bench with a CO2 laser as the heat source which, unlike the more commonly used burner rigs, allows exquisite control of the heating and cooling rates. An optical …

Interfacial Toughness Evolution Under Thermal Cycling By Laser Shock And Mechanical Testing Of An Eb-Pvd Coating System, Vincent Guipont, Vincent Maurel, Marion Bartsch, Anne Dennstedt

Thermal Barrier Coatings V

One of the major challenges for coatings on superalloys is to keep adherence during aging, where damage is mostly driven by thermal cycling. On the other hand, the methodology of the evaluation of the interfacial toughness should be consistent with in service loading. Recently, the use of LAser Shock Adhesion Test (LASAT) has shown its capability for both ranking different coating solutions and evaluating the evolution of a given coating as a function of aging [1-2]. The intent of this paper is to demonstrate the ability of LASAT to reproduce damage mechanisms observed under quasi-static in plane mechanical testing and …

Electronic Structure, Pore Size Distribution, And Sorption Characterization Of An Unusual Mof, {[Ni(Dpbz)][Ni(Cn)4]}N, Dpbz = 1,4-Bis(4-Pyridyl)Benzene, Winnie Wong-Ng, Izaak Williamson, Matthew Lawson, Daniel W. Siderus, Jeffrey T. Culp, Yu-S. Chen, Lan Li

Materials Science and Engineering Faculty Publications and Presentations

The monoclinic (Ni(L)[Ni(CN)₄] (L= 1,4-Bis(4-pyridyl) benzene) compound (defined as Ni-dpbz) is a flexible metal organic framework which assumes a pillared structure with layers defined by 2D Ni[Ni(CN)₄]_n nets and dpbz ligands as pillars. The structure features an entrapped dpbz ligand that links between the open ends of four-fold Ni sites from two neighboring chains. This arrangement results in an unusual 5-fold pseudo square-pyramid environment for Ni and a significantly long Ni-N distance of 2.369(4) Å. Using Density Functional Theory calculations, the different bonding characteristics between the 5-fold and 6-fold Ni's were determined. We found that …

Aftershocks In Slowly Compressed Bulk Metallic Glasses: Experiments And Theory, Louis W. Mcfaul, Wendelin Wright, Xiaojun Gu, Jonathan T. Uhl, Karin A. Dahmen

Faculty Journal Articles

We observe two distinct interevent time patterns in the slip avalanches of compressed bulk metallic glasses (BMGs). Small slip avalanches cluster together in time, but large slip avalanches recur roughly periodically. We compare the timing patterns of BMG slip avalanches with timing patterns of earthquakes and with the predictions of a mean-field model. The time clustering of small avalanches is similar to the known time clustering of earthquake foreshocks and aftershocks.

Usu College Of Engineering Lights Up Salt Palace At Education Conference, Usu College Of Engineering

College of Engineering News

Utah State University was center stage at the Salt Palace Convention Center earlier this week during a major event for engineering education.

Design And Characterization Of Polymer Nanocomposites For Engineering Applications, Joseph Richard Nalbach

Theses and Dissertations

Polymer nanocomposites represent an area of materials that can yield useful properties not achievable in bulk materials. Not only can they have such properties but also they can be relatively easy to generate. With dwindling fossil fuels there is an increased need for both new methods to harvest energy and to transport the captured energy more effectively. Two separate nanocomposite materials are created to support this work with dramatically different properties, both to aid in energy efficiency. The first is an energy harvesting foam to fully utilize the structural deformability of such a material. A dissolvable sugar scaffold is combined …

Recent Progress For Fe-N-C Electrocatalysts In Alkaline Fuel Cells, Xin Deng, Heng-Quan Chen, Ye Hu, Qing-Gang He

Journal of Electrochemistry

Fuel cells are highly recommended nowadays due to their intrinsic advantages such as high energy conversion efficiency, nearly no pollution, and convenient operation. With the development of anion exchange membrane, alkaline fuel cells have gone through a renaissance thanks to their superiorities such as faster reaction kinetics, wider choices for both fuels and electrocatalysts. It is essential to find an appropriate electrocatalyst for oxygen reduction reaction (ORR) to improve the performance of alkaline fuel cells. Further commercialization of the widely used Pt-based materials has suffered from disadvantages such as scarcity and high cost. As alternatives to largely investigated Pt-based materials, …

Pt/G-C3N4 Nanosheet For Visible Light-Induced Enhancement Of The Activity For Formic Acid Electro-Oxidation, Yong-Rong Sun, Chun-Yu Du, Guo-Kang Han, Ya-Jing Wang, Yun-Zhi Gao, Ge-Ping Yin

Journal of Electrochemistry

By using graphitic carbon nitride nanosheet (g-C₃N₄ nanosheet) as a support,Pt/g-C₃N₄ nanosheet catalyst was fabricated by microwave assisted polylol process. The nanoparticles size,composition,structure and optical properties of Pt/g-C₃N₄ nanosheet were characterized by TEM,XRD,XPS and UV-Vis diffuse reflectance spectroscopy. Comparing with the catalytic activities toward formic acid electro-oxidation under dark and visible light illumination,the superior activity of Pt/g-C₃N₄ nanosheet catalyst was achieved under visible light illumination. This visible light-driven enhancement in the formic acid performance could be attributed to the plasmon-induced electron-hole separation on g-C₃N₄ with …

Carbon Composite Fe3O4 Nanoparticles Based Electrochemical Sensor For Hydrogen Peroxide Detection, Si-Yu Zhang, Hui-Juan Wang, Shu-Fang Li, Jian-Ying Qu

Journal of Electrochemistry

In this work, a novel hydrogen peroxide electrochemical sensor was constructed with ferroferric oxide (Fe₃O₄) magnetic nanoparticles, which demonstrated good electrocatalytic activity for hydrogen peroxide. There existed a good linear relationship between the concentration of hydrogen peroxide and the oxidation peak current in the range of 1.00 × 10^-6 ~ 1.00 × 10^-3 mol·L^-1 (R = 0.9980) with the detection limit of 6.60 × 10-7 mol·L^-1. The sensor exhibited good anti-interference ability, high reproducibility and stability.

Simulation Of Fractal Growth On Metal Wire Electrode, Li-Feng Ding, Pei-Yuan Mao, Jun Cheng, Yu-Lan Niu, Yu-Hao Wen, Wei Chen

Journal of Electrochemistry

During processes of metal electrodepostion, there exist many complex morphological forms such as dendritic growing in the cathode deposited metal edge, which will seriously affect the quality of the electrodeposited product and current efficiency during machining. Investigations on dendritic crystal growing process and morphology could help controlling growth of electrolysis precipitate. In this work, Python and Matlab softwares were used, and the model of parallel electrode electrodeposition was established based on the diffusion-limited aggregation (DLA) model. By analyzing the law of fractal growth at different conditions of the particles number, probability, electrode spacing, the movement step length and orientation drift, …

Lead Modified Nanoporous Platinum Electro-Catalysts For Formic Acid Oxidation, Yuan-Yuan Zhang, Qing-Feng Yi, Ge-Kun-Kun Zuo, Tao Zou, Xiao-Ping Liu, Xiu-Lin Zhou

Journal of Electrochemistry

Platinum (Pt) catalysts modified by other suitable metals significantly enhance their electrochemical activities for formic acid oxidation. In this work, a titanium-supported nanoporous network platinum (nanoPt/Ti) electrode was prepared using a hydrothermal method. The as-prepared nanoPt/Ti electrode was modified with a certain amount of lead by using cyclic voltammetry for different scan cycle numbers (n), namely, n = 10, 15, 20 and 30, to synthesize the novel lead-modified nanoporous Pt (nanoPb_(n)-Pt/Ti) electrodes. Electro-oxidation of formic acid on these electrodes was studied with cyclic voltammetry (CV), chronoamperometry and chronopotentiometry in sulfuric acid solution. CV curves showed that both nanoPt/Ti …

Regularized Algorithms Of Adaptive Assessment Of State Of Control Objects With Parametric Perturbation Account, Х.Z Igamberdiyev, D.T Kadirov

Chemical Technology, Control and Management

The problems of constructing stable algorithms for adaptive estimation of the state of control objects with allowance for parametric perturbations based on the theory of conditional Gaussian filtration are considered. Algorithms for estimating the state of stochastic controllable objects using the regularized method of the Cholesky factorization and pseudo-inversion of perturbed symmetric matrices are given. These algorithms allow us to stabilize the procedure for inversion of matrices in estimating the state of stochastic objects and, thereby, to increase the accuracy of determining the true estimate of the state vector when the parameters of the object and the observer are perturbed.

Mathematical Simulation And Development Of The System Of Control Of Processes Of Rectification Of Compounds In Production Of Ethyl Alcohol, Yu.Sh Avazov

Chemical Technology, Control and Management

A mathematical description of the process of rectification of multicomponent mixtures is given, and dynamic models for the operation of individual sections of a typical rectification column are obtained, and a structurally parametric synthesis of an invariant control system is performed on this basis. The generalized algorithm of process control by rectification of multicomponent mixtures is substantiated. The technique for determining the membership function by the method of pairwise comparisons is described and models for controlling the stochastic process of rectification of multicomponent mixtures based on fuzzy logic are obtained.

Analytic Description Of The Magnetic Permeability Of The Core Of Magnetoelastic Force Sensors Against Mechanical Voltage, S.F Amirov, K.K Jurayeva

Chemical Technology, Control and Management

The articlegives an analytical expression of the dependence of the relative magnetic permeability of the ferromagnetic core of the mafnetoelastic force sensor on the applied mechanical stresses. It is shown that for magnetoelastic force transducers whose magnetic circuit operates on a linear portion of the main magnetization curve, the dependence of the relative magnetic permeability of the ferromagnetic core on the applied mechanical stresses applied to the sensors can be approximated as a linear function with a negative coefficient of proportionality.

Algorithms For Adaptive Identification Of Parameters Of Stochastic Control Objects, Y.А Yusupov

Chemical Technology, Control and Management

Algorithms for adaptive identification of parameters of stochastic control objects are given. The task of identifying a managed object is reduced to the task of estimating the parameters of the regression model on the basis of the generalized least-squares method. Algorithms for the sustainable estimation of object parameters on the basis of stable recurrent procedures are presented. These algorithms allow us to effectively calculate the desired parameters of an identified object under the conditions of the time correlation of the noise acting on the object.

Methods Of Optimizing Data Processing Based On Fuzzy Correction Of Time Series Elements And Variable Identification Models, I.I Jumanov, Z.T Bekmurodov

Chemical Technology, Control and Management

The problem of optimal identification and processing of random time series (RTS) based on the use of the property of statistical, dynamic, fuzzy models is formulated. A method for the qualitative identification of RTS is proposed, including algorithms for fuzzy equations, logical conclusions, taking into account the effects of environmental factors and the nonstationarity of processes. A generalized algorithm for identifying the RTS with regulation and correction of variables values based on fuzzy logic rules, ways of searching for extrema by norms and -norms is developed. Designed tools for optimal data processing by determining the appropriate model; parametric and structural …

Processing Off-Balanced Ore From Central Kyzylkum In Enriched Superphosphate And Ammophosphate Fertilizers, А.А Rasulov, О.А Badalova, Sh.S Namazov, А.R Seytnazarov, B.М Beglov

Chemical Technology, Control and Management

Process of receiving two types of fertilizers by division into liquid and solid phases of products of fosfornosernokislotny expansion of the mineralized mass (MM) Central Kyzylkumov is studied. In that case, mass ratio WPA : ММ was 100:15 while amount of H2SO4mng ranged 2 tо 5 g. The distribution rate of components (Р2О5, СаО, MgO, AI2O3, Fe2O3, N, SO3) on phases was estimated. It was shown that the enriched superphosphate with good physicochemical properties could be obtained from the solid phase while concentrated ammophosphate exceeding ammophos by quality considerably based on the liquid phase.

The Distribution Of Impurities Along The Height Of The Conical Part Of The Hydrocyclone In The Purification Of Hydrocarbons, A.A. Khudaiberdiev, A.M. Hurmamatov, O.Yu Ismailov

Chemical Technology, Control and Management

The results of the study of the process of purification of hydrocarbons from mechanical impurities using hydrocyclone are presented. The distribution curves of the equivalent diameter of the "equilibrium" particles along the height of the conical part of the test sample of the hydrocyclone are constructed (D = 0.4 m, HK = 0.65 m). The analysis of the obtained data showed the possibility of centrifugal purification of hydrocarbon raw materials from particles with a size of 0.024 to 0.2 mm, depending on the physical properties of the phases to be separated. The distribution pattern of the equivalent diameter of the …

Analysis Of Synthetic Dyes In The Ketchup And Tomato Paste, A.P Pasovsky, А.А Begunov, B.M Axmedov

Chemical Technology, Control and Management

Influence of matriks of fruit and vegetable canning products on separation and the subsequent chromatographic fractionation of synthetic dyes azo-, a trifenilmetan and indigoid row, allowed now for use in the food industry is studied. Researches were conducted by means of the liquid Shimadzu LC-20 Prominence chromatograph. The conducted researches are intended to contribute to the development of normative and technical monitoring of synthetic dyes in food.

Cotton Picker's Spindle Speed Control By Measuring Sensoe Frequency, E.U Uljaev, U.M Ubaydullaev

Chemical Technology, Control and Management

The paper considers the problem of measuring the rotational speeds of spindles of a cotton picking machine, using the method of counting the number of observed pulses within a given time interval with a constant width. Calculation of the quantization error with a change in the rotational speed is carried out. It is established that the relative error of the chosen control method is a function of the speed of rotation itself. The calculation of the error is carried out and the results of the modulation of rotational speeds at various rotational speeds of the spindles are shown graphically. It …

Theoretical Research And Computer Simulation Of Composite Transistors Made Of A Semiconductor Material With Different Width Of Forbidden Zone, N.B Alimova, A.A Yarmukhamedov

Chemical Technology, Control and Management

The results of theoretical research and computer simulation of composite transistors made of a semiconductor material with different width of forbidden zone are presented in the article. To study the volt-ampere characteristics of such composite transistors, an interactive computer simulation program was developed in the programming environment of Delphi-6. It is shown that the proposed transistors make it possible to improve manufacturability when it is manufactured industrially. The proposed composite transistors are designed for output stages of power amplifiers, radio transmitting devices, electronic equipment for industrial and automotive electronics.

To A Question Of Classification Of The Processed Raw Materials And The Products Sold On Their Basis According To The Product Range Of Externally Economy Activity, R.K Murzayev, A.T Dzhalilov, M.R Sodikova, M.K Abdumavlyanova, Z.A Tadzhikhodzhayev

Chemical Technology, Control and Management

The analysis of the state is carried out and the classification of goods in the Commodity Nomenclature of Foreign Economic Activity (CN FEA) is studied. Questions on the possibility of including a commodity product obtained on the basis of waste or secondary products of production or consumption, to a new classification code of the Commodity Nomenclature for Foreign Economic Activities (CN FEA) are considered. The analysis of the inclusion of the proposed chemical products-waste, secondary products of production and products based on them, in accordance with the provisions of the Rules and definitions for these types of raw materials, materials …