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Full-Text Articles in Engineering

A Multifunctional Treatment Process For Combined Sewer Overflow Pollutants And Nutrient Control, Tiziana Venditto Apr 2021

A Multifunctional Treatment Process For Combined Sewer Overflow Pollutants And Nutrient Control, Tiziana Venditto

Electronic Thesis and Dissertation Repository

Combined sewer overflows (CSOs) contain a highly variable, wide range of contaminants, both in particulate and soluble form, making conventional water treatment processes unable to offer adequate public health protection. To date, no study proposed an efficient and cost-competitive treatment able to remove a broad spectrum of CSO pollutants. This research demonstrated that a chemical pre-treatment, followed by micro-sieve filtration and UV disinfection is an efficient and cost-competitive treatment for CSOs. Pollutant removal was achieved by first adsorbing soluble pollutants on zeolite and powdered activated carbon, and subsequently applying filtration carried out by polymer-enhanced microsieving. Optimal treatment condition, consisting of ...


Catechol-Containing Copolymers As An Active Ingredient For Denture Adhesives, Vincent Ying Wun Kong Apr 2021

Catechol-Containing Copolymers As An Active Ingredient For Denture Adhesives, Vincent Ying Wun Kong

Electronic Thesis and Dissertation Repository

Moisture inside the mouth adds challenge to making denture adhesives formulations. Some formulations have zinc to enhance adhesion on wet skin despite knowing the health hazards. Inspired by mussel foot proteins’ catechol unit’s strong underwater adhesion, nine catechol-containing copolymers (P1A-P3C) were synthesized by free radical polymerization of 3,4-dimethoxystyrene (3,4- DMS) with different styrene derivatives followed by deprotection. P1A-P3C were used to make Fn(P)-C-PBS denture adhesive formulations which had suitable shear stresses around ≥ 5 kPa satisfying ISO 10873. In-situ NMR studies of free radical polymerization of 3,4 - DMS and styrene derivatives allowed computation of their ...


Discontinuous Fiber Vacuum Assisted Compression Molding, Bennet Heidenreich Apr 2021

Discontinuous Fiber Vacuum Assisted Compression Molding, Bennet Heidenreich

Electronic Thesis and Dissertation Repository

Discontinuous short fiber carbon reinforced polymer (CFRP) composites were manufactured, and tested to demonstrate feasibility, and to document material properties. Different variations of manufacturing techniques were tested including continuous fiber reinforcement, metal inserts, and randomization of the dry fibers before processing. The process produced parts with strength to weight ratios similar to 6061-T6 aluminum without continuous fiber reinforcement, and 53% higher when small volumes of continuous reinforcement are added. Randomization of fibers produced no significant change in strength of the material, but did increase compression stiffness of the mixture while molding, increasing tool deflection. A pin joint was tested, and ...


Using Ionic Liquids In Fabrication Of Vo2 For Thermochromic Coatings, Shidokht Nazari Apr 2021

Using Ionic Liquids In Fabrication Of Vo2 For Thermochromic Coatings, Shidokht Nazari

Electronic Thesis and Dissertation Repository

Energy-efficient or smart windows are an important part of net zero energy housing as excellent candidates for energy conservation. They can control the amount of light and heat passing through them in response to an external stimulus such as heat (thermochromic) or electricity (electrochromic). Vanadium Oxide (VO2) is a potential thermochromic material to provide an automatic reversible semiconductor-metal phase transition from the monoclinic structure to tetragonal at 68 °C. However, there remain major challenges in fabricating desirable VO2-based films to meet the requirements for large-scale implementation. Mainly, the phase transition temperature (Tc) should be close to ...


Anammox Process For Nitrogen Removal: Development Of Sustainable Gel Beads And Its Application In Fluidized Bed Reactors (Fbrs), Mohammad M I Chowdhury Apr 2021

Anammox Process For Nitrogen Removal: Development Of Sustainable Gel Beads And Its Application In Fluidized Bed Reactors (Fbrs), Mohammad M I Chowdhury

Electronic Thesis and Dissertation Repository

Biological nitrogen removal (BNR) processes have been widely used for removing wastewater nitrogen because of effectiveness, economics, and environmental friendliness. Considering the energy requirements for nitrification and need for external carbon for denitrification in conventional BNR processes, anaerobic ammonia-oxidizing bacterial (anammox) processes facilitate energy-neutral or net energy positive biological treatment as well as reduce operational costs because of reduction in aeration energy, which constitutes 50%-60% of the overall energy consumption at municipal wastewater treatment plants, elimination of external organic carbon requirements, and lower sludge production. However, one of the major challenges in the practical application of the anammox process ...


Flow Visualization Study Of Wake-Stabilized Diffusion Flames In A Crossflow: Effects Of Crossflow Turbulence, Diya Cui Apr 2021

Flow Visualization Study Of Wake-Stabilized Diffusion Flames In A Crossflow: Effects Of Crossflow Turbulence, Diya Cui

Electronic Thesis and Dissertation Repository

Effects of crosswind turbulence on the mechanisms and flow structures affecting emissions from non-premixed wake stabilized flames from elevated stacks are investigated. In the current work, two conditions of upstream crossflow are tested to investigate the effects of turbulence on the flame, including the turbulent flow with enhanced freestream turbulence that is generated by a passive grid placed upstream of the burner, and smooth flow with ambient turbulence for baseline comparisons. The experimental method of Mie scattering flow visualization is used to investigate the effects of turbulence. The addition of freestream turbulence has been found to make changes to the ...


Probing The Role Of Silicates For Corrosion Control In Lead Plumbing, Hailey Holmes Apr 2021

Probing The Role Of Silicates For Corrosion Control In Lead Plumbing, Hailey Holmes

Electronic Thesis and Dissertation Repository

Lead service lines and fittings were installed in Canada's drinking water networks until 1986 and currently pose severe health risks. As pipes corrode over decades of use, lead is released into drinking water resulting in dangerous exposure to elevated lead levels. Sodium silicates can be used for corrosion control of lead, however a basic understanding of how they work is lacking. This thesis describes the results of experiments conducted to determine how silicates interact with lead and aluminum in drinking water, using microscopic and spectroscopic techniques. The results show the presence of silicates inhibited Pb2+ carbonates from oxidizing ...


Burst Capacity Evaluation Of Corroded Pipelines Under Internal Pressure And Internal Pressure Combined With Longitudinal Compression, Shulong Zhang Apr 2021

Burst Capacity Evaluation Of Corroded Pipelines Under Internal Pressure And Internal Pressure Combined With Longitudinal Compression, Shulong Zhang

Electronic Thesis and Dissertation Repository

Central to the design and integrity assessment of oil and gas transmission pipelines is to accurately evaluate their pressure containment capacities, i.e. burst capacities. Corrosion defects threaten the structural integrity of pipelines as they cause thinning of the pipe wall and therefore reduce the burst capacity. Corroded in-service pipelines may be subjected to longitudinal compression resulting from, for example, ground movement or formation of free spans, in addition to internal pressures. The main objective of the research reported in this thesis is to facilitate Fitness-For-Service (FFS) assessment of corroded pipelines.

The first study investigates the conservatism associated with the ...


Non-Linear Effects Of Solution Parameters And Gamma Radiation On Nickel Oxidation Dynamics, Razieh Karimihaghighi Mar 2021

Non-Linear Effects Of Solution Parameters And Gamma Radiation On Nickel Oxidation Dynamics, Razieh Karimihaghighi

Electronic Thesis and Dissertation Repository

Nickel is the main component in nickel-based superalloys which are known for their superior corrosion resistance and mechanical properties. These alloys are used in nuclear power plants, mainly for thin-walled heat exchanger tubing where these materials are exposed to a continuous flux of ionizing radiation. The long-term corrosion behaviour of these alloys at high temperatures and in the presence of gamma-radiation is not well understood. Moreover, the mechanism by which nickel improves the corrosion resistance of these alloys is also not known. Therefore, a mechanistic understanding of the nickel oxidation process is required to develop a predictive corrosion model for ...


Fibrin-Based Engineered Vascular Tissues As Platforms For Cellular Studies And Disease Modeling, Khalil Dayekh Mar 2021

Fibrin-Based Engineered Vascular Tissues As Platforms For Cellular Studies And Disease Modeling, Khalil Dayekh

Electronic Thesis and Dissertation Repository

Vascular tissue engineering (VTE) is an emerging alternative therapeutic intervention strategy to treat diseases such as atherosclerosis. While the ultimate goal of VTE is designing tissues to serve as graft substitutes, they can also serve as powerful tools to study tissue and disease development and drug discovery.

In this work, engineered vascular tissues from fibrin gel, mouse embryonic multipotent progenitor cell line (10T1/2 cells), and rat embryonic thoracic artery smooth muscle cells (A-10 cells) were used as models to study the Notch signaling pathway and vascular calcification. The 10T1/2 cells were successfully differentiated into vascular smooth muscle cells ...


Nnemo (Neonatal Neuromonitor) - A Hybrid Optical System To Characterize Perfusion And Metabolism In The Newborn Brain, Ajay Rajaram Mar 2021

Nnemo (Neonatal Neuromonitor) - A Hybrid Optical System To Characterize Perfusion And Metabolism In The Newborn Brain, Ajay Rajaram

Electronic Thesis and Dissertation Repository

Premature birth, defined as a gestational period less than 37 weeks, occurs in 8% of infants born in Canada. These births are associated with a higher risk of developing neurological complications. Infants born with very low birth weights (VLBW, < 1500 g) experience cognitive or behavioural deficits at a rate of 40-50%, while a further 5-10% develop major disorders such as cerebral palsy. The likelihood of injury increases with a shorter gestational period and/or a lower birthweight. Intraventricular hemorrhaging (IVH) occurs in 20-25% of VLBW infants, characterized by bleeding in the germinal matrix and surrounding white matter. This highly vascularized region is particularly susceptible to bleeds due to underdeveloped cerebrovascular structures. Severe IVH causes an inflammatory response and subsequent obstruction of cerebrospinal fluid (CSF) drainage, resulting in enlargement of the brain’s ventricles, referred to as post-hemorrhagic ventricular dilatation (PHVD). PHVD increases intracranial pressure and can result in compression/damage of brain tissue.

Diagnosis of IVH and PHVD is regularly performed using cranial ultrasound. Clinicians can visually assess and grade hemorrhaging/ventricle dilatation. Ultrasound, however, is limited in its ability to continuously monitor and only detects irreversible damage. NNeMo (Neonatal NeuroMonitor) is a hybrid optical device combining diffuse correlation (DCS) and near-infrared spectroscopy (NIRS) to simultaneous monitor cerebral blood flow (CBF) and metabolism at ...


Assessment Of The Impacts Of Climate Change, Land Cover Transition, And Internal Climate Variability On The Hydrology Of A Forested Watershed, Vahid Mehdipour Mar 2021

Assessment Of The Impacts Of Climate Change, Land Cover Transition, And Internal Climate Variability On The Hydrology Of A Forested Watershed, Vahid Mehdipour

Electronic Thesis and Dissertation Repository

In this study, the impacts of climate and land cover (LC) changes on the hydrologic processes of the Batchawana watershed in Central Ontario are assessed. Batchawana is a snow-dominated forested watershed with coniferous, deciduous and mixed trees and numerous small lakes. A semi-distributed hydrological model, based on the Raven hydrological framework, is calibrated and validated using ground-based observations for 1981-2001 and 2002-2011, respectively. Eight downscaled General Circulation Models (GCMs) that participated in the Coupled Model Intercomparison Project Phase 5 (CMIP5) and three large ensembles (50 members) of Regional Climate Model (RCM) simulations, under the Representative Concentration Pathway (RCP) 8.5 ...


Laparoscopic Image Recovery And Stereo Matching, Wenyao Xia Mar 2021

Laparoscopic Image Recovery And Stereo Matching, Wenyao Xia

Electronic Thesis and Dissertation Repository

Laparoscopic imaging can play a significant role in the minimally invasive surgical procedure. However, laparoscopic images often suffer from insufficient and irregular light sources, specular highlight surfaces, and a lack of depth information. These problems can negatively influence the surgeons during surgery, and lead to erroneous visual tracking and potential surgical risks. Thus, developing effective image-processing algorithms for laparoscopic vision recovery and stereo matching is of significant importance. Most related algorithms are effective on nature images, but less effective on laparoscopic images.

The first purpose of this thesis is to restore low-light laparoscopic vision, where an effective image enhancement method ...


A Partial-Turbulence Approach To Estimate Peak Wind Loads On Low-Rise Building Roofs, Yitian Guo Feb 2021

A Partial-Turbulence Approach To Estimate Peak Wind Loads On Low-Rise Building Roofs, Yitian Guo

Electronic Thesis and Dissertation Repository

Quasi-steady (QS) theory is a commonly-used tool in wind engineering for the assessment of wind loads on structures induced by large-scale gusts. However, the QS-based approach tends to underestimate peak loads significantly since it fails to capture the effects of small-scale and body-generated turbulence. The objective of this thesis is to develop a method to estimate peak wind loads on low-rise roofs based on a partial-turbulence approach, i.e., using the QS vector model for loads induced by large-scale fluctuations from the incident flow, and a separate statistical model to account for the effects due to body-generated turbulence.

Wind tunnel ...


Study Of Recyclable And Repairable Dynamic Covalent Polymers For Sustainable 3d Printing Development, Mingyue Zheng Feb 2021

Study Of Recyclable And Repairable Dynamic Covalent Polymers For Sustainable 3d Printing Development, Mingyue Zheng

Electronic Thesis and Dissertation Repository

3D printing technology with valuable features, including cost-saving, easy access, and unlimited structure design, has attracted significant attention and been employed for production use. This technology has also been considered as a sustainable manufacturing method and quickly developed in recent years. However, the development of sustainable 3D printing is still facing challenges, especially in waste management. Thanks to the flexibility of 3D printing and diversified printing mechanisms, the big step forward can be approachable by the transformation from materials. This dissertation presents a variety of strategies designed for sustainable 3D printing development based on the combination of dynamic covalent chemistry ...


Motion Intention Estimation Using Semg-Acc Sensor Fusion, Jose Alejandro Lopez Feb 2021

Motion Intention Estimation Using Semg-Acc Sensor Fusion, Jose Alejandro Lopez

Electronic Thesis and Dissertation Repository

Musculoskeletal injuries can severely impact the ability to produce and control body motion. In order to regain function, rehabilitation is often required. Wearable smart devices are currently under development to provide therapy and assistance for people with impaired arm function. Electromyography (EMG) signals are used as an input to pattern recognition systems to determine intended movements.

However, there is a gap between the accuracy of pattern recognition systems in constrained laboratory settings, and usability when used for detecting dynamic unconstrained movements. Motion factors such as limb position, interaction force, and velocity, are known to have a negative impact on the ...


Experimental Simulation Of A Density-Driven Downburst Translating Within A Turbulent Boundary Layer, Shivani Ashitkumar Jariwala Feb 2021

Experimental Simulation Of A Density-Driven Downburst Translating Within A Turbulent Boundary Layer, Shivani Ashitkumar Jariwala

Electronic Thesis and Dissertation Repository

Downburst outflows emerging from thunderstorm producing clouds are contained within the atmosphere where the outflow interacts with the preexisting atmospheric boundary layer (ABL). This novel study employs a realistic approach for experimental simulation of downbursts by translating the downburst source within a scaled ABL within a hydraulic flume system that produces open channel flow. The density-driven model approach is used, involving an iris operated cylinder release mechanism translating inside the ABL generated over a restrictive fetch using passive turbulence generating devices at model scales of 1:5500 and 1:10,000. The velocity vector fields across a vertical plane revealed ...


Finite Element Analysis Of Buckling Capacity Of Conical Steel Tanks Considering Field-Measured Initiation Imperfections – A Case Study, Haoyi Zhang Feb 2021

Finite Element Analysis Of Buckling Capacity Of Conical Steel Tanks Considering Field-Measured Initiation Imperfections – A Case Study, Haoyi Zhang

Electronic Thesis and Dissertation Repository

The geometric imperfection in elevated steel conical water tanks is a key factor that influences the buckling capacity of the tank. Current considerations of imperfections in the design of conical tanks are based on theoretical analysis, whereby the imperfection shapes and locations are assumed to have the most critical impact on the capacity. This thesis investigates the initial imperfections of an actual stiffened liquid-filled steel conical tank (LFCT) based on high-resolution laser scan measurement data of the tank geometry.

In the first part of this study, detailed analyses of the laser scan data were carried out to extract the global ...


Impact Of Artisanal And Small-Scale Mining On Water Bodies And Treatment: The Case Of Birim River Basin In Ghana, Adwoa Boadua Yirenkyi Fianko Feb 2021

Impact Of Artisanal And Small-Scale Mining On Water Bodies And Treatment: The Case Of Birim River Basin In Ghana, Adwoa Boadua Yirenkyi Fianko

Electronic Thesis and Dissertation Repository

Water bodies, the source of drinking water for many rural households in mining areas are at risk of contamination due to artisanal and small-scale mining (ASM) activities. Water quality, therefore, remains a topical issue for policymakers and researchers.

This research sought to achieve three objectives: firstly, to evaluate the effectiveness of existing policies and regulations about ASM in protecting waterbodies. Secondly, to determine the impact of ASM on waterbodies, health and livelihood of inhabitants in mining communities and thirdly, to remove heavy metals from water using locally available bio-adsorbents such as moringa seeds, coconut and corn husks.

A survey of ...


Cluster Acceleration And Stabilization In Downflow Catalytic Reactors: Experimental And Cpfd Simulation Studies, Cesar Alejandro Medina Pedraza Feb 2021

Cluster Acceleration And Stabilization In Downflow Catalytic Reactors: Experimental And Cpfd Simulation Studies, Cesar Alejandro Medina Pedraza

Electronic Thesis and Dissertation Repository

Particle cluster dynamics in downflow reactors are of great importance for the implementation of large scale, environmentally friendly catalytic processes. Studies should address particle cluster velocities, solids holdups, and individual cluster sizes to establish reliable models for the unit scale up.

In this PhD dissertation, the individual characteristics of particle clusters, such as cluster size, velocity, and particle volume fraction, were measured in the feeding, intermediate, and fully developed flow sections of a cold-flow model unit using CREC-GS-Optiprobes. The downer unit employed in this research had a 0.051 m ID and a 2 m high acrylic column. The feeding ...


Enhanced Primary Sludge Fermentation And Anaerobic Digestion For Integrated Carbon Upgrade And Resource Recovery, Gholamreza Bahreini Feb 2021

Enhanced Primary Sludge Fermentation And Anaerobic Digestion For Integrated Carbon Upgrade And Resource Recovery, Gholamreza Bahreini

Electronic Thesis and Dissertation Repository

The emerging paradigm shift towards renewable resource recovery, and energy minimization in municipal wastewater treatment plants (WWTPs) coupled with increased concern over nutrients-related eutrophication accelerated the development of biosolids treatment technologies for simultaneous waste minimization, resource recovery, and carbon upgrade. Biological nutrient removal (BNR) processes, often need excess carbon source to meet stringent quality standards. Despite successful use of sludge fermentation liquid to enhance the BNR, different techniques, are applied to improve the low conversion yield of fermentation and optimize resource recovery. In this context, insights on the impact of two commonly used primary treatment techniques (i.e. conventional primary ...


Experimental Study Of Tornado-Induced Pressures, Aya Kassab Jan 2021

Experimental Study Of Tornado-Induced Pressures, Aya Kassab

Electronic Thesis and Dissertation Repository

The increased devastation associated with tornadic flow-fields in terms of human lives or destruction of properties and their subsequent economic losses highlights the significance of understanding the tornado vortex structure, particularly near the ground where the majority of this destruction happens. While the body of research in this area is increasing there is a lack of resolution associated with physical near-surface measurements in tornado-like vortices (TLVs) and the effects of translation, surface roughness, and surface vortex dynamics are not yet well understood.

In order to address these gaps, high spatial and temporal surface pressure measurements were carried out at WindEEE ...


In Vitro Analyses Of The Contributions Of The Hip Capsule To Joint Biomechanics, Emma Donnelly Jan 2021

In Vitro Analyses Of The Contributions Of The Hip Capsule To Joint Biomechanics, Emma Donnelly

Electronic Thesis and Dissertation Repository

Optimal management of the hip capsule during arthroscopic surgery has not been established. The impact of incisions made to the capsule during minimally invasive procedures on joint biomechanics, and whether repair provides any benefit, continue to be debated. The effectiveness of capsular repair to restore native kinematics may be insufficient. Therefore, a better understanding of joint behavior during various capsule conditions is needed. A new robotic system was used to analyze the effect of progressive capsulotomy incision and repairs on the behavior of a normal hip within range of motion (ROM) limits with respect to the intact joint. Complete repairs ...


New Experimental Methods For Modelling Canopy Problems, Marilena Enus Jan 2021

New Experimental Methods For Modelling Canopy Problems, Marilena Enus

Electronic Thesis and Dissertation Repository

The challenge in large scale experimental fluid dynamics comes from the demand to develop simple methods that can measure and model movement of flexible objects and wind flow over large three-dimensional volumes with readily available equipment. Representing and modelling the flow around trees is challenging mainly because of the complexity and variability of trees. In this research different methods were tested in the novel Wind Engineering Energy and Environment (WindEEE) Dome facility at Western University, Canada to capture displacements of a moving single tree and flow velocities over a model forest edge in a three-dimensional form. The tested measuring methods ...


Immobilized Jagged1 For Notch3-Specific Differentiation And Phenotype Control Of Vascular Smooth Muscle Cells, Kathleen E. Zohorsky Jan 2021

Immobilized Jagged1 For Notch3-Specific Differentiation And Phenotype Control Of Vascular Smooth Muscle Cells, Kathleen E. Zohorsky

Electronic Thesis and Dissertation Repository

Notch signaling plays a critical role in regulating vascular morphogenesis. In vascular interventions, the endothelial cells (ECs) are often damaged, and EC-SMC contact is compromised. The objective of this study was to investigate if immobilized Jagged1 can act as an EC-surrogate material to direct and control vascular smooth muscle cell (VSMC) behavior via Notch signaling. It was shown that immobilized Jagged1 induced vascular differentiation of iPSC-derived mesenchymal stem cells and mouse embryonic multipotent cells. Immobilized Jagged1 was insufficient to induce mature contractile markers in coronary artery SMCs; therefore, serum starvation and TGFβ1 treatment were investigated. Although Notch signaling is mechanosensitive ...


Design, Development, And Evaluation Of Customized Electronics For Controlling A 5-Dof Magneto-Rheological Actuator Collaborative Robot, Ziqi Yang Jan 2021

Design, Development, And Evaluation Of Customized Electronics For Controlling A 5-Dof Magneto-Rheological Actuator Collaborative Robot, Ziqi Yang

Electronic Thesis and Dissertation Repository

In recent years, Magneto-Rheological (MR) fluids has been used in various fields such as robotics, automotive, aerospace, etc. The most common use of the MR fluids is within a clutch-like mechanism, namely an MR clutch. When mechanical input is coupled to the input part of the MR clutch, the MR clutch provides a means of delivering this mechanical input to its output, through the MR fluids. The combination of the mechanical input device and the MR clutch is called an MR actuator. The MR actuator features inherently compliance owing to the characteristic of the MR fluids while also offering higher ...


Protecting Health Data In A Pandemic: A Systematic Adversarial Threat Analysis Of Contact Tracing Apps, Leah Krehling Dec 2020

Protecting Health Data In A Pandemic: A Systematic Adversarial Threat Analysis Of Contact Tracing Apps, Leah Krehling

Electronic Thesis and Dissertation Repository

In this thesis centralized, decentralized, Bluetooth, and GPS based applications of digital contact tracing were reviewed and assessed. Using privacy principles created by a contingent of security and privacy experts from across Canada, a metric of assessing an application’s privacy was created. An attack tree was built to assess the security of the contact tracing applications. Eighteen attacks were theorized against contact tracing applications currently in use. An application’s vulnerability to the attacks was measured using a scoring system developed for this purpose. The results of the security scores were used to create a metric for assessing the ...


Bridging Thermochemical And Biochemical Conversion: Impact Of Biochar Addition On The Anaerobic Digestion Of Aqueous Pyrolysis Condensate, Neha Batta Dec 2020

Bridging Thermochemical And Biochemical Conversion: Impact Of Biochar Addition On The Anaerobic Digestion Of Aqueous Pyrolysis Condensate, Neha Batta

Electronic Thesis and Dissertation Repository

Profitable treatment of low value waste biomass is one of the biggest challenges of the industry. Where most of the current treatment strategies, such as pyrolysis, are efficient in complete breakdown of hard to synthesize, low value waste biomass such as lignocellulosic wastes, it leads to the generation of secondary waste thereby compromising its efficiency. The aim of this research is to utilize the aqueous pyrolysis condensate as a feedstock for anaerobic digestion, previously adapting the microbial consortia to the acidity and other potential organic inhibitors present in the APC, to produce energy in the form of biogas following the ...


Effects Of City Growth On Tall Building Cladding Fatigue, Hang You Dec 2020

Effects Of City Growth On Tall Building Cladding Fatigue, Hang You

Electronic Thesis and Dissertation Repository

As city develops there will be changes in the aerodynamic characteristics due to varying building surrounding and topology. For example, the city growth around a tall building can cause an increase in wind load due to venturi or wake effects or decrease due to sheltering effects depending on the type of surrounding. The densification of cities will also increase the turbulence level due to wake effects. In the present study, the implication of these changes on the aerodynamic forces on cladding connections is investigated. With increased fluctuations in the wind loads, the cladding connections will also experience stress fluctuations, which ...


Modeling And Simulation Of Concentric And Eccentric Tube Continuum Robots, Lexuan Wang Dec 2020

Modeling And Simulation Of Concentric And Eccentric Tube Continuum Robots, Lexuan Wang

Electronic Thesis and Dissertation Repository

Unlike conventional manipulators where the robot is actuated at discrete joints, continuum robots are actuated continuously in smooth curves. These robots are often dexterous and compact, allowing them to operate in constrained environments during minimally invasive medical interventions. Since the unconventional robot structure often consists of elastic or flexible materials, the corresponding kinematics formulation is significantly more challenging to derive and simulate. This thesis introduces two different but related continuum robot designs: the concentric tube robot (CTR) and the eccentric tube robot (ETR). These designs utilize multiple pre-curved and superelastic nitinol tubes to actuate the robot. This mechanism also leads ...