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Articles 31 - 52 of 52
Full-Text Articles in Engineering
Green Thermosetting Factory: Novel Star-Shaped Bio-Based Systems And Their Thermosetting Resins; Synthesis And Characterization, Arash Jahandideh
Green Thermosetting Factory: Novel Star-Shaped Bio-Based Systems And Their Thermosetting Resins; Synthesis And Characterization, Arash Jahandideh
Electronic Theses and Dissertations
Increasing attentions toward sustainable development, economic and environmental issues have led to many attempts at replacing the petroleum-based materials with renewables. Substitution of petroleum-based platforms with green alternative technologies is beneficiary in different ways. Using bio-renewables reduces the dependency of the national plastic industry to the petroleum resources and substantially promotes the environmental profile and sustainability of the product. It is expected that the emergence of the corn-based thermosetting industry generates substantial profits for the corn production sector. Developments in the emerging biobased thermosets are spectacular from a technological point of view. However, there are still several disadvantages associated with …
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 …
Effects Of Mechanical Bar Splices On Seismic Performance Of Reinforced Concrete Buildings, Abdullah Al Hashib
Effects Of Mechanical Bar Splices On Seismic Performance Of Reinforced Concrete Buildings, Abdullah Al Hashib
Electronic Theses and Dissertations
Mechanical bar splices, which are commonly referred to as couplers, are currently used in reinforced concrete structures to directly connect steel bars in lieu of conventional lap splicing. With proper detailing, couplers can be utilized to connect precast beams and columns to accelerate the construction. However, the experimental and analytical studies regarding their effect on the performance of RC moment-resisting frames (MRFs) are scarce. Current ACI 318 restricts the use of couplers in plastic hinge regions of special moment-resisting frames (SMRFs). Nevertheless, they can be incorporated at any location of the intermediate and ordinary MRFs. The seismic performance of RC …
Modeling Streamflow And Water Quality Impacts Of Grassland Establishment, Conversion, And Management In Skunk Creek Watershed, Jiyeong Hong
Modeling Streamflow And Water Quality Impacts Of Grassland Establishment, Conversion, And Management In Skunk Creek Watershed, Jiyeong Hong
Electronic Theses and Dissertations
Grassland is a valuable natural resource with many environmental benefits, which include erosion control, wildlife habitat promotion, water quality protection, and flood prevention. Conversion of grassland to cultivated cropland has been linked to environmental quality concerns. The goal of this study was to model the impacts of grassland establishment, depletion, and management on hydrology and water quality in Skunk Creek watershed in eastern South Dakota. The specific objectives are to quantify the impacts of grassland conversion and selected management regimes on streamflow and water quality, and explore the optimum grassland establishment location within a watershed to achieve water quality benefits. …
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 …
Bio Inspired Lightweight Composite Material Design For 3d Printing, Kaushik Thiyagarajan
Bio Inspired Lightweight Composite Material Design For 3d Printing, Kaushik Thiyagarajan
Electronic Theses and Dissertations
Lightweight material design is an indispensable subject in product design. The lightweight material design has high strength to weight ratio which becomes a huge attraction and an area of exploration for the researchers as its application is wide and increasing even in every day-to-day product. Lightweight composite material design is achieved by selection of the cellular structure and its optimization. Cellular structure is used as it has wide multifunctional properties in addition to the lightweight characteristics. Applications of light weight cellular structures are wide and is witnessed in all industries from aerospace to automotive, construction to product design. In this …
Evaluating The Interactive Effects Of Traffic Volumes And Access Density On Crash Frequency, Ali Mohammed Alsubeai
Evaluating The Interactive Effects Of Traffic Volumes And Access Density On Crash Frequency, Ali Mohammed Alsubeai
Electronic Theses and Dissertations
Control of access points (e.g., driveway density) is an important consideration in roadway access management. Research has shown that by limiting the number of access points, there is a reduction in the number of conflict points along a roadway, resulting in improved safety. The effects of managing access points on crash frequency are documented as Crash Modification Factors/Functions (CMF) in the Highway Safety Manual (HSM) and the federal Highway Administration’s CMF Clearinghouse. The CMFs from the HSM indicate that the impacts of Access Density (AD) on crash frequency are a function of both AD and traffic volume (for rural roads). …
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 …
Understanding The Impacts Of Ammonia Fiber Expansion (Afex™) Pretreatment And Densification On Densified Products Quality And The Bioproducts Yield Through Enzymatic Hydrolysis And Fast Pyrolysis, Vijay Sundaram
Electronic Theses and Dissertations
Lignocellulosic biomass poses significant challenges during handling, transportation, and storage due to its low bulk density. Densification involves conversion of the low bulk density biomass into a highly compacted product which helps in improving the handling, transporting, and storage obstacles associated with biomass logistics. Besides the logistical challenges, the recalcitrant nature of the lignocellulosic biomass makes it even more challenging during the enzymatic hydrolysis. The carbohydrate components, cellulose and hemicellulose are not readily accessible by the enzymes during the hydrolysis process due to the presence of lignin. Pretreatment is the process to convert the native recalcitrant biomass in the form, …
Impact Of Subsurface Drainage On Water Yield For Typical Soil And Weather In Eastern South Dakota, Govinda Karki
Impact Of Subsurface Drainage On Water Yield For Typical Soil And Weather In Eastern South Dakota, Govinda Karki
Electronic Theses and Dissertations
Subsurface drainage in agricultural land changes the field water balance by providing an alternate pathway for subsurface water. Determining the effects of subsurface drainage on downstream hydrology requires quantifying the components of the water balance. A number of studies have looked at the hydrological impacts of subsurface drainage. However, the effects are complex and difficult to generalize. The complex interaction involves the interrelation among variables such as soil type and properties, climate (rainfall and evapotranspiration), and drainage design configuration (drainage intensity and drainage coefficient), which all are local in nature. Additionally, most studies have been conducted in humid climates, whereas …
Exploring The Relationship Between Immediacy Behaviors And Student Motivation In Engineering Classrooms: Immediacy As A Cause Of Motivation, Andrea N. Barahona Guerrero
Exploring The Relationship Between Immediacy Behaviors And Student Motivation In Engineering Classrooms: Immediacy As A Cause Of Motivation, Andrea N. Barahona Guerrero
Electronic Theses and Dissertations
Instructor immediacy is an essential characteristic of effective instructors. Although instructional communication has done extensive research on the impact of immediacy behaviors on students, there is little available research observing immediacy behaviors as predictors of motivation on engineering students. As a result, this study examined the impact of engineering instructors’ use of immediacy behaviors on engineering students’ motivation. The results indicated that verbal immediacy predicted engineering student motivation. The thematic analysis revealed that when students perceived their instructors as helpful, students’ motivation to learn and ask more questions increased. The thematic analysis also observed that when instructors seemed unapproachable, students …
The Synthetic Biology Of N2-Fixing Cyanobacteria For Photosynthetic Terpenoid Production, Charles T. Halfmann
The Synthetic Biology Of N2-Fixing Cyanobacteria For Photosynthetic Terpenoid Production, Charles T. Halfmann
Electronic Theses and Dissertations
In the last few decades, concerns over global climate change, energy security, and environmental pollution have been rising. To overcome these challenges, the concept of “-nth generation” biofuels has emerged as a strategy to convert solar radiation into fuels and bulk industrial chemicals for societal use, while decreasing our consumption of nonrenewable energy sources. Nitrogen-fixing cyanobacteria hold a distinct advantage in biofuel production over plants, given their ability to convert sunlight, air (CO2 and N2), and mineralized water to energy-dense carbon molecules, as well as fix atmospheric nitrogen gas into ammonia for metabolism. Engineered cyanobacteria with …
Advanced Carbon Materials Based Electrodes For High Performance Symmetric Supercapacitors, Keliang Wang
Advanced Carbon Materials Based Electrodes For High Performance Symmetric Supercapacitors, Keliang Wang
Electronic Theses and Dissertations
Supercapacitors have received considerable attention due to their high energy density, long life time, rapid charge/discharge rate, and because they are environmental friendly technology. Electrode materials play a key role in the final performance of supercapacitors. Carbon, usually used as symmetric supercapacitors electrode materials, exhibit extraordinary stability in harsh electrolyte and electrochemical performance owing to its physical and chemical properties. In addition, porous structure originated from activation, excellent electrical conductivity, sustainability, wide availability and low cost further offering the improvement in electrochemical performance and make it to be a promising electrode material for symmetric supercapacitors. Considering the factors affected electrochemical …
Monopile Foundation Offshore Wind Turbine Simulation And Retrofitting, William A. Schaffer
Monopile Foundation Offshore Wind Turbine Simulation And Retrofitting, William A. Schaffer
Electronic Theses and Dissertations
Offshore wind turbines (OWT) provide a renewable source of energy with great proximity to many large cities. This has caused a major increase in OWT development and implementation, primarily in Europe, but spreading throughout the world. There are a multitude of different foundation options, each with their own benefits. The most common types are: monopile, jacket, TLP, Semi-Submersible, and SPAR. The monopile foundation OWT has been proven to be the most economic selection for water depths up to approximately 25m. This thesis has analyzed strictly monopile foundations due to their previous success and popularity. Three different chapters have been created …
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 …
Assessing The Near-Wall Hemodynamics In The Left Coronary Artery Using Cfd, John Junior Asiruwa
Assessing The Near-Wall Hemodynamics In The Left Coronary Artery Using Cfd, John Junior Asiruwa
Electronic Theses and Dissertations
The objective of this thesis is to computationally investigate the flow mechanics and the near-wall hemodynamics associated with the different take-off angles in the left coronary artery of the human heart. From this study, we will be able to evaluate if the increase in the take-off angles of the left coronary artery will significantly increases or decrease the likelihood of plaque (atherosclerosis) buildup in the left coronary artery bifurcations. This study quantifies the effects of the varying take-off angles on the branches along the left anterior descending (LAD) of the left coronary artery using computational fluid dynamics (CFD) simulations. The …
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 …