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Articles 1 - 22 of 22
Full-Text Articles in Engineering
Normalization Of Pseudo-Invariant Calibration Sites For Increasing The Temporal Resolution And Long-Term Trending, Harika Vuppula
Normalization Of Pseudo-Invariant Calibration Sites For Increasing The Temporal Resolution And Long-Term Trending, Harika Vuppula
Electronic Theses and Dissertations
Given their low level of temporal, spatial, and spectral variability, Pseudo-Invariant Calibration Sites (PICS) have been increasingly desired as data sources for radiometric calibration of Earth imaging satellite sensors. The temporal resolution for PICS data acquired by any sensor is limited by the amount of time required for it to make subsequent passes over the site. Consequently, for any given PICS, it can take many years of imaging to develop a sufficient amount of cloud-free data to perform radiometric calibration; this can be especially problematic for sensors in their early years after launch. This thesis presents techniques to combine Landsat-8; …
Modeling Of The Solid-Electrolyte Interface Layer Of Lithium Ion Batteries For Capacity Fade Using Kinetic Monte Carlo, Bigyan Khanal
Modeling Of The Solid-Electrolyte Interface Layer Of Lithium Ion Batteries For Capacity Fade Using Kinetic Monte Carlo, Bigyan Khanal
Electronic Theses and Dissertations
The accurate model on the growth of Solid-Electrolyte Interface (SEI) layer of Lithiumion batteries is used to study the capacity fade, ageing, and cycling life and provides significant information to ensure the battery safety. In this work, the model for SEI layer dynamics is developed using the Kinetic Monte Carlo approach, in which four major dynamical processes including adsorption, absorption, diffusion, and passivation are described by their individual rates, and determined from chemical and physical properties of materials used in the battery. Total cycle numbers to be simulated determine the number of Kinetic Monte Carlo steps. The formation of a …
Adaptive Audio Classification Framework For In-Vehicle Environment With Dynamic Noise Characteristics, Haitham Alsaadan
Adaptive Audio Classification Framework For In-Vehicle Environment With Dynamic Noise Characteristics, Haitham Alsaadan
Electronic Theses and Dissertations
With ever-increasing number of car-mounted electric devices that are accessed, managed, and controlled with smartphones, car apps are becoming an important part of the automotive industry. Audio classification is one of the key components of car apps as a front-end technology to enable human-app interactions. Existing approaches for audio classification, however, fall short as the unique and time-varying audio characteristics of car environments are not appropriately taken into account. Leveraging recent advances in mobile sensing technology that allows for an active and accurate driving environment detection, in this thesis, we develop an audio classification framework for mobile apps that categorizes …
Simulation Of Magnetically Confined Inductively Coupled Plasma, Sina Javadpour
Simulation Of Magnetically Confined Inductively Coupled Plasma, Sina Javadpour
Electronic Theses and Dissertations
In this work, a new parallel coil design was presented to address the need for high density inductively coupled plasmas with enhanced properties and a more uniform and consistent distribution, suitable for large-area material processing. Fluid model simulations of 3D argon inductively coupled plasma (ICP) were performed in COMSOL for the proposed coil and a conventional single cylindrical coil with the same impedance to be used as reference, to compare and evaluate the performance of this new halftoroidal parallel coil design and study its effects on the main variables of the generated plasma. Through different comparisons of the simulations results, …
Worldwide Optimal Pics Search, Ruchira Tabassum
Worldwide Optimal Pics Search, Ruchira Tabassum
Electronic Theses and Dissertations
Pseudo Invariant Calibration Sites (PICS) have proven to be a dependable calibration source for determining degradation of visible and infrared sensor response due to their temporal stability and spatial uniformity. One limit of PICS is that only a handful have been identified, primarily in desert areas of North Africa, Saudi Arabia, and elsewhere. A large number of PICS would not only facilitate calibration of existing and future sensors, but also provide an alternative to internal on-board calibrator data, resulting in significant cost savings and simplification in sensor design. As a result, the process to efficiently identify additional PICS is highly …
Voltage Regulation Of Low Voltage Distribution Networks, Manisha Maharjan
Voltage Regulation Of Low Voltage Distribution Networks, Manisha Maharjan
Electronic Theses and Dissertations
The modern voltage distribution systems consist of distributed generation (DG), like photovoltaics (PV) and wind. These resources are inexhaustible and environmentally friendly. The existing low voltage (LV) distribution networks are typically designed for unidirectional power flow. The integration of DG makes the LV distribution networks prone to difficulties related to voltage, frequency, and power quality. The main challenges in the integration of DG occur due to the intermittent nature of DG. The amount of DG compared with the total generation resource on a power system network is measured as penetration. The system undergoes through reverse power flow when there is …
Identification, Calculation And Warning Of Horizontal Curves For Low-Volume Two-Lane Roadways Using Smartphone Sensors, Shaohu Zhang
Identification, Calculation And Warning Of Horizontal Curves For Low-Volume Two-Lane Roadways Using Smartphone Sensors, Shaohu Zhang
Electronic Theses and Dissertations
Smartphones and other portable personal devices that integrate global positioning systems, Bluetooth Low Energy, and advanced computing technologies have become more accessible due to affordable prices, product innovation, and people’s desire to be connected. As more people own these devices, there are greater opportunities for data acquisition in Intelligent Transportation Systems, and for vehicle-to-infrastructure communication. Horizontal curves are a common factor in the number of observed roadway crashes. Identifying locations and geometric characteristics of the horizontal curves plays a critical role in crash prediction and prevention, and timely curve warnings save lives. However, most states in the US face a …
Mathematical Modeling And Capacity Fading Study In Porous Current Collector Based Lithium Ion Battery, Surendra Bajagain
Mathematical Modeling And Capacity Fading Study In Porous Current Collector Based Lithium Ion Battery, Surendra Bajagain
Electronic Theses and Dissertations
Lithium ion (Li-ion) batteries are primary energy storage devices especially in electronic gadgets, electric vehicles and for stationary storage of intermittent renewable energy. These applications demand durable Li-ion batteries with higher energy density. Energy density can be increased either by finding novel electrode materials or by modifying the existing design of the battery. The electrode materials or modified design should not only increase energy density, but also should control the capacity fading of the battery. In this work, existing mathematical model of Li-ion battery was adjusted in the case of the porous current collector. The discharge performance and capacity fading …
Engineering Of Photo-Rechargeable Energy Storage, Ashim Gurung
Engineering Of Photo-Rechargeable Energy Storage, Ashim Gurung
Electronic Theses and Dissertations
Solar photovoltaics (PV) is a very promising renewable energy technologies as it is abundant and pollution-free. However, the major drawback of PV power is its intermittency. Integration of batteries with solar modules can reduce overall PV system costs and increase the practicality of PV power. Integration of the photovoltaic cells with supercapacitor storage proved feasibility of combined photovoltaic energy generation and storage but the supercapacitors had low energy storage capacity. Photovoltaic cells with integrated Li-ion batteries as energy storage were demonstrated but had a complex structure due to multiple PV cells; low efficiency due to a mismatch between the PV …
Screen Printed Carbon Electrode Based Microfluidic Biosensor For Sweat Cortisol Detection, Shailu Shree Poudyal
Screen Printed Carbon Electrode Based Microfluidic Biosensor For Sweat Cortisol Detection, Shailu Shree Poudyal
Electronic Theses and Dissertations
A simple, cost-effective, microfluidic, field-deployable biosensor with screen printed carbon electrode (SPCE) was developed for detection of sweat cortisol with point of care applications. Cortisol detection in artificial sweat is an important screening tool for diagnosis and monitoring of various health conditions like Addison’s disease, stress disorder, and Cushing’s syndrome. A self-assembled monolayer of graphene oxide (GO) is functionalized on SPCE electrode, onto which cortisol antibodies are immobilized for cortisol detection. Microfluidic system ensured precise and controlled flow of reagents and antibodies. Electrochemical measurement is done using cyclic voltammetry, as a function of cortisol concentrations. Cyclic voltammetry measurement gives current …
A Dynamic Scaling Methodology For Improving Performance Of Big Data Systems, Nashmiah Alhamdawi
A Dynamic Scaling Methodology For Improving Performance Of Big Data Systems, Nashmiah Alhamdawi
Electronic Theses and Dissertations
The continuous growth of data volume in various fields such as, healthcare, sciences, economics, and business has caused an overwhelming flow of data in the last decade. The overwhelming flow of data has raised challenges in processing, analyzing, and storing data, which lead many systems to face an issue in performance. Poor performance of systems creates negative impact such as delays, unprocessed data, and increasing response time. Processing huge amounts of data demands a powerful computational infrastructure to ensure that data processing and analysis success [7]. However, the architectures of these systems are not suitable to process that quantity of …
Microfluidic Enhanced Fabry-Perot Etalon Based Optical Biosensor For The Detection Of Biological Substances In Liquid With Refractive Index Measurement, Nezam Uddin
Electronic Theses and Dissertations
A new microfluidic optical biosensor was demonstrated for refractive index measurements with high sensitivity and accuracy in the range of few micrometers liquid channels utilizing a Fabry-Perot cavity formed between two reflective semitransparent surfaces. The transmitted light through the cavity forms interference peaks in the transmission spectrum which is dependent upon the refractive index of the fluid in the microfluidic channel. We demonstrate the biosensor using Fabry-Perot to provide high accuracy and sensitivity with real-time measurement. The sensor can resolve refractive index changes with the shift of peak wavelength of transmitted spectrum. In our Fabry- Perot etalon based biosensor, two …
Control Of Pore Characteristics Of Porous Silicon Using Non-Toxic Electrochemical Etching For Photovoltaics And Supercapacitor Applications, Utpal Saha
Electronic Theses and Dissertations
Porous silicon has exhibited lower reflectance and higher surface area than the pristine silicon. This property of porous silicon can be applied to photovoltaic (PV) application for more efficient silicon solar cells and for higher performance of supercapacitors. NH4Fl electrolytic etching solution has been used to fabricate porous silicon, but the control of pore morphology of silicon is achieved only by controlling the time. Therefore, it is urgently required to use other etching parameters such as voltage and current to achieve flexible control of pore properties. Porous silicon can also be used to fabricate supercapacitors. An established approach to make …
Development Of Highly Sensitive And Selective Breathing Sensors Using Molecular Imprinted Filtering For Diabetic And Alcoholic Patients, Md. Saleh Akram Bhuiyan
Development Of Highly Sensitive And Selective Breathing Sensors Using Molecular Imprinted Filtering For Diabetic And Alcoholic Patients, Md. Saleh Akram Bhuiyan
Electronic Theses and Dissertations
Wellness sensor technology is an emerging diagnostic test research field, which mostly deal with the point of care of the patients in the recent days. Due to the lack of awareness from the patients, most diseases cannot be detected in due time. This led to worse conditions, such as diabetic and alcoholic syndrome. Therefore, many research groups have been working to develop portable sensor devices that can track serious diseases. These include diabetic and alcoholic biomarkers in breathing. These devices have very high selectivity and reliability. However, the major limitation of biomarkers is that it deals with the bio-molecular based …
Enhanced Breast Cancer Classification With Automatic Thresholding Using Support Vector Machine And Harris Corner Detection, Mohammad Taheri
Enhanced Breast Cancer Classification With Automatic Thresholding Using Support Vector Machine And Harris Corner Detection, Mohammad Taheri
Electronic Theses and Dissertations
Image classification and extracting the characteristics of a tumor are the powerful tools in medical science. In case of breast cancer medical treatment, the breast cancer classification methods can be used to classify input images as benign and malignant classes for better diagnoses and earlier detection with breast tumors. However, classification process can be challenging because of the existence of noise in the images, and complicated structures of the image. Manual classification of the images is timeconsuming, and need to be done only by medical experts. Hence using an automated medical image classification tool is useful and necessary. In addition, …
Pretreatment, Enzymatic Hydrolysis, And Fermentation To Ethanol Using A Lignocellulosic Feedstock And Subsequent Recovery Of A Value Added Co-Product: Pure Crystalline Cellulose, Ryan J. Bouza
Electronic Theses and Dissertations
As more demand for alternatives to petroleum and the industrial world’s love of cars increase, cellulosic ethanol will become more important. The ethanol can, of course, be used in the transportation fuel sector, but there is also a potential for co-products to be developed out of the cellulose to ethanol process. Some of these co-products have the potential to replace current petrol products. These co-products may provide the extra revenue generation needed for further investment and development of this industry. This would not only provide better energy independence, but in the United States, it would better satisfy the cellulosic ethanol …
Cathode Interface Engineering For High Performance Planar Perovskite Solar Cells, Md Nazmul Hasan
Cathode Interface Engineering For High Performance Planar Perovskite Solar Cells, Md Nazmul Hasan
Electronic Theses and Dissertations
Organic-inorganic hybrid perovskite solar cells (PSCs) have already improved their power conversion efficiency (PCE) from 3.9% to ~22.1% at present. This demonstrated that PSCs can be a promising alternative to conventional silicon solar cells. PSCs have been marked as one of the most favorable next-generation solar cells due to their high extinction coefficient, broad light absorption range and ambipolar charge transport properties, low production cost, and simple fabrication processing. Various device architectures have been designed and investigated for constructing high performance PSCs consisting of different electron transport layers (ETL) and hole transport layers (HTL). In general, PSCs are fabricated in …
Efficient Energy Optimization For Smart Grid And Smart Community, Avijit Das
Efficient Energy Optimization For Smart Grid And Smart Community, Avijit Das
Electronic Theses and Dissertations
The electric power industry has undergone significant changes in response to the environmental concerns during the past decades. Nowadays, due to the integration of different distributed energy systems in the smart grid, the balancing between power generation and load demand becomes a critical problem. Specifically, due to the intermittent nature of renewable energy sources (RESs) , power system optimization becomes significantly complicated. Due to the uncertain nature of RESs, the system may fail to ensure the power quality which may cause increased operating costs for committing costly reserve units or penalty costs for curtailing load demands. This dissertation presents three …
Energy Management System Considering Battery Lifetime, Prajina Tandukar
Energy Management System Considering Battery Lifetime, Prajina Tandukar
Electronic Theses and Dissertations
The contribution of renewable energy resources in the global energy generation has been increasing at a fast pace. Variability and uncertainty are the two main issues related to renewable energy integration. Thus, energy storage systems (ESSs) are used in such systems to smooth the power generated by the renewable energy sources. In order to ensure reliable and economic operation of the system, energy management system (EMS) is implemented to control the dispatch of the available resources. ESS such as a battery requires significant capital investment and frequent replacement. A battery has a maximum lifetime called float life, regardless of energy …
Intelligent Learning Control System Design Based On Adaptive Dynamic Programming, Naresh Malla
Intelligent Learning Control System Design Based On Adaptive Dynamic Programming, Naresh Malla
Electronic Theses and Dissertations
Adaptive dynamic programming (ADP) controller is a powerful neural network based control technique that has been investigated, designed, and tested in a wide range of applications for solving optimal control problems in complex systems. The performance of ADP controller is usually obtained by long training periods because the data usage efficiency is low as it discards the samples once used. Experience replay is a powerful technique showing potential to accelerate the training process of learning and control. However, its existing design can not be directly used for model-free ADP design, because it focuses on the forward temporal difference (TD) information …
Electrochemical Sensor For Metal Ions And Phosphate Ion Detection For Biomedical And Agriculture Application, Md Faisal Kabir
Electrochemical Sensor For Metal Ions And Phosphate Ion Detection For Biomedical And Agriculture Application, Md Faisal Kabir
Electronic Theses and Dissertations
The goal of this work was to develop electrochemical sensors for heavy metal ions (e.g., Cd2+, Hg2+, Pb2+) and phosphate detections in fertilizers with high sensitivity, high detection range, repeatability and portability. The heavy metal electrochemical sensors were made using novel graphene oxide/silver nanowire (GO/AgNWs) composite as working electrode. The phosphate electrochemical sensors were fabricated using ammonium molybdate tetrahydrate/silver nanowires (AMT/AgNWs) modified screen printed electrode. Most of the heavy metals such as mercury, lead, cadmium, and arsenic have dangerous effects on human body. These ions can enter human body system via agriculture food chain …
Development Of Microgrid Test Bed For Testing Energy Management System, Shaili Nepal
Development Of Microgrid Test Bed For Testing Energy Management System, Shaili Nepal
Electronic Theses and Dissertations
Today the world population has reached 7.5 billion, and this number is expected to grow at the rate of 1.13% every year [1]. With this increase in population, the total demand for electricity has also increased. More people means the need for more power: electricity to power homes, schools, industries, hospitals, and so on. In today’s world, where most of the daily activities are dependent on electricity, demand for electricity, therefore, continues to rise. Currently, managing this growing need for electricity is one of the challenges the world is facing. In addition to this, approximately 1.2 billion people live in …