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1
(5930270), Mehdi Shishehbor. "Numerical Investigation on the Mechanical Properties of Neat Cellulose Nanocrystal." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<div>Nature has evolved efficient strategies to make materials with hierarchical internal structure that often exhibit exceptional mechanical properties. One such example is found in cellulose, which has achieved a high order of functionality and mechanical properties through a hierarchical structure with an exceptional control from the atomic level all the way to the macroscopic level. Cellulose is present in a wide variety of living species (trees, plants, algae, bacteria, tunicates), and provides the base reinforcement structure used by organisms for high mechanical strength, high strength-
2
(5929580), Man Chung Chim. "Prototype L-band Synthetic Aperture Radar on Low-altitude / Near-ground Platforms." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<div>Synthetic Aperture Radar (SAR) is a technique to synthesize a large antenna array using the motion of a small antenna. When it comes to remote sensing, mapping, and change detection, SAR has been shown to be a good candidate by its ability to penetrate moisture and vegetation, and the avilibility of phase information for precise interferometric measurements [1] [13].</div><div><br></div><div><div>This study was motivated by the fact that satellite and high-altitude SAR has limited data availability in terms of temporal resolution and the cost of every measurement. It is believed that SAR
3
(6616565), Yunchang Zhang. "PEDESTRIAN-VEHICLE INTERACTIONS AT SEMI-CONTROLLED CROSSWALKS: EXPLANATORY METRICS AND MODELS." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p>A large number of crosswalks are
indicated by pavement markings and signs but are not signal-controlled. In this study, such a location is called
“semi-controlled”. In locations where
such a crosswalk has moderate amounts of pedestrian and vehicle traffic,
pedestrians and motorists often engage in a non-verbal “negotiation”, to
determine who should proceed first. </p>
<p> </p>
<p>In this study, 3400
pedestrian-motorist non-verbal interactions at such semi-controlled crosswalks
were recorded by video. The crosswalk locations observed during the study
underwent a conversion from one-way o
4
(5930783), Chintan Hitesh Patel. "Pack Rust Identification and Mitigation Strategies for Steel Bridges." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>Pack rust or crevice corrosion is a type of localized corrosion. When a metal is in contact with a metal, or even non-metal, the metal starts to corrode, and rust starts to pack in between the surfaces. When signicant development of pack rust occurs, it can cause overstressing of bolts and rivets causing them to fail, and it can bend connecting plates and member elements thus reducing their buckling capacity. Thus it is important to mitigate the formation and growth of pack rust in bridges. This study was conducted to determine if pack rust occurs frequently and thereby may pose a problem
5
(5930969), Augustine M. Agyemang. "THE IMPACTS OF ROAD CONSTRUCTION WORK ZONES ON THE TRANSPORTATION SYSTEM, TRAVEL BEHAVIOR OF ROAD USERS AND SURROUNDING BUSINESSES." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p>In our daily use of the transportation system, we are faced
with several road construction work zones. These construction work zones change
how road users interact with the transportation system due to the changes that
occur in the system such as increased travel times, increased delay times and
vehicle stopped times. A microscopic traffic simulation was developed to depict
the changes that occur in the transportation system. The impacts of the changes
in the transportation system on the human travel behavior was investigated
using ordered probit and logit models using five independent vari
6
(11178147), Hala El Fil. "Shear Response of Rock Discontinuities: Through the Lens of Geophysics." Thesis, 2021.
Znajdź pełny tekst źródłaStreszczenie:
<p>Failure along rock discontinuities can result in economic losses
as well as loss of life. It is essential to develop methods that monitor the
response of these discontinuities to shear loading to enable prediction of
failure. Laboratory experiments are performed to investigate geophysical
techniques to monitor shear failure of a pre-existing discontinuity to detect
signatures of impending failure. Previous studies have detected precursors to
shear failure in the form of maxima of transmitted waves across a discontinuity
under shear. However, those experiments focused on well-matched
discon
7
(7041299), Sijia Wang. "Post-Fire Assessment of Concrete in Bridge Decks." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p>In recent years, there have been a number of truck fires involving
bridges with concrete components. If the fire burns for a significant period of
time, the structural integrity of concrete components could be damaged due to fire.
Research-based guidance for evaluating the level of fire damage is currently unavailable
and would be beneficial for post-fire bridge inspectors. </p>
<p>This research project focused on evaluating the effects of
fire induced damage on concrete bridge deck elements. In order to achieve this
goal, a series of controlled heating experiments and material analysis we
8
(5930996), Linji Wang. "EVALUATION OF VEGETATED FILTER STRIP IMPLEMENTATIONS IN DEEP RIVER PORTAGE-BURNS WATERWAY WATERSHED USING SWAT MODEL." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
In 2011, the Deep River Portage-Burns Waterway Watershed was identified as a priority in the
Northwest Indiana watershed management framework by the Northwester Indiana Regional
Planning Committee. 319 grant cost-share programs were initiated in effort of maintaining and
restoring the health of Deep River Portage-Burns Waterway Watershed. A watershed management
plans have been developed for this watershed which proposed the implementation of vegetated
filter strips (VFS) as an option. In this thesis work, the effectiveness of VFS as a best management
practice (BMP) for the Deep River system wa
9
(5930987), Mingda Lu. "ASSESSING THE PERFORMANCE OF BROOKVILLE FLOOD CONTROL DAM." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>In this study, the performance of a flood control reservoir called Brookville Reservoir located in the East fork of the Whitewater River Basin, was analyzed using historic and futuristic data. For that purpose, USEPA HSPF software was used to develop the rainfall runoff modelling of the entire Whitewater River Basin up to Brookville, Indiana. Using uncontrolled flow data, the model was calibrated using 35 years of data and validated using 5 years by evaluating the goodness-offit with R2, RMSE, and NSE. Using historic data, the historic performances were accessed initially.</div><div>Using
10
(7046339), Luz Maria Agudelo Urrego. "FINITE ELEMENT MODELING OF BURIED ARCHED PIPES FOR THE ESTIMATION OF MAXIMUM FILL COVERS." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>The Indiana Department of Transportation implements maximum soil fill covers to ensure the safe installation and operation of buried pipes. Historically, fill cover tables are provided by INDOT, but the methodology for calculating these covers is not well documented. The finite element method enables a comprehensive analysis of the soil-pipe system taking into account soil conditions, pipe type and geometry, and conditions on the pipe-soil interface. </div><div><br></div><div>This thesis discusses the calculation of maximum fill covers for corrugated and structural plate pipe-arches using
11
(9179471), Kuan Hung Lin. "COMPARATIVE ANALYSIS OF SWAT CUP AND SWATSHARE FOR CALIBRATING SWAT MODELS." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>Soil and water assessment tool model (SWAT model) is a
widely used model when dealing with large and complex watershed simulations. To
correctly predict runoff of a watershed, auto-calibration methods are applied.
Among all the platforms, SWAT CUP is widely used in the SWAT model community.
The new web-based calibration platform: SWATShare is also gaining its
popularity due to the benefits of user-friendly interface, access to
high-performance computing resources, and collaborative interface. While the
algorithm implemented in SWAT CUP is Sequential Uncertainty Fitting version 2
(SUFI2), So
12
(9739793), Audrey Lafia-Bruce. "TRANSPORTATION INFRASTRUCTURE NETWORK PERFORMANCE ANALYSIS." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>The main objective of this thesis is to analyze the
transportation infrastructure based on performance measures. In doing so, the abstract
presents a transportation network as a system of nodes and links. It is
important to identify critical components in transportation networks. In
identifying critical components of the network, performance measures such as nodal
degree, nodal closeness, nodal eigen vector, nodal betweenness, which are the
most widely used were explored in the analysis of the network. These measures
account for the vulnerability of a node to failure in the transportation
n
13
(8086718), Xiangxi Tian. "IMAGE-BASED ROAD PAVEMENT MACROTEXTURE DETERMINATION." Thesis, 2021.
Znajdź pełny tekst źródłaStreszczenie:
<p>Pavement macrotexture contributes
greatly to road surface friction, which in turn plays a significant role in
reducing road incidents. Conventional methods for macrotexture measurement
techniques (e.g., the sand patch method, the outflow method, and laser
measuring) are either expensive, time-consuming, or of poor repeatability. This
thesis aims to develop and evaluate affordable and convenient alternative
approaches to determine pavement macrotexture. The proposed solution is based
on multi-view smartphone images collected in situ over the pavement. Computer
vision techniques are then appl
14
(8922227), Mohamadreza Moini. "BUILDABILITY AND MECHANICAL PERFORMANCE OF ARCHITECTURED CEMENT-BASED MATERIALS FABRICATED USING A DIRECT-INK-WRITING PROCESS." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p></p><p>Additive Manufacturing (AM) allows
for the creation of elements with novel forms and functions. Utilizing AM
in development of components of civil infrastructure allows for achieving more advanced, innovative, and unique performance characteristics. The
research presented in this dissertation is focused on development of a better understanding
of the fabrication challenges and opportunities in AM of cement-based materials. Specifically, challenges related to printability and opportunities offered by
3D-printing technology, including ability to fabricate intricate structures and
gener
15
(5929889), Joo Min Kim. "Behavior, Analysis and Design of Steel-Plate Composite (SC) Walls for Impactive Loading." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
There is significant interest in the used of Steel-plate composite (SC) walls for protective structures, particularly for impactive and impulsive loading. The behavior of SC walls is fundamentally different from that of reinforced concrete (RC) walls due to the addition of steel plates on the exterior surfaces, which prevent concrete scabbing and enhance local perforation resistance.<div><br></div><div>Laboratory-scale SC wall specimens were fabricated, cast with concrete, and then tested in an indoor missile impact test-setup specially-built and commissioned for this research. The parameters
16
(6845639), Farida Ikpemesi Mahmud. "Simplified Assessment Procedure to Determine the Seismic Vulnerability of Reinforced Concrete Bridges in Indiana." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div><div><div><p>The possibility of earthquakes in Indiana due to the presence of the New Madrid Seismic Zone is well known. However, the identification of the Wabash Valley Seismic Zone has increased our understanding of the seismic hazard in the state of Indiana. Due to this awareness of the increased potential for earthquakes, specifically in the Vincennes District, the seismicvulnerability of Indiana’s bridge network must be assessed. As such, the objective of this thesis is to develop a simplified assessment procedure that can be used to conduct a state-wide seismic vulnerability assessm
17
(6640721), Alexandra D. Mallory. "On the development of an open-source preprocessing framework for finite element simulations." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
Computational modeling
is essential for material and structural analyses for a multitude of reasons,
including for the improvement of design and reducing manufacturing costs.
However, the cost of commercial finite element packages prevent companies with
limited financial resources from accessing them. Free finite element solvers,
such as Warp3D, exist as robust alternatives to commercial finite element
analysis (FEA) packages. This and other open-source finite element solvers are
not necessarily easy to use. This is mainly due to a lack of a preprocessing
framework, where users can generate me
18
(6641012), Genisson Silva Coutinho. "FACULTY BELIEFS AND ORIENTATIONS TO TEACHING AND LEARNING IN THE LAB: AN EXPLORATORY CASE STUDY." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>This dissertation presents a two-phase multiple case study conducted to investigate the faculty</div><div>beliefs regarding the integration of labs into engineering and engineering technology education</div><div>and the relationship between such beliefs and the teaching practices adopted in the labs. In the first</div><div>phase, an exploratory study grounded on a framework of beliefs was conducted to elicit the beliefs</div><div>espoused by the participants. Interviews were used to elicit the participants’ beliefs. The</div><div>transcribed interviews were analyzed through the constant c
19
(7040873), Ting-Wei Wang. "ANCHORING TO LIGHTWEIGHT CONCRETE: CONCRETE BREAKOUT STRENGTH OF CAST-IN, EXPANSION, AND SCREW ANCHORS IN TENSION." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
The use<b></b>of lightweight concrete in the concrete industry provides economical and practical advantages. Structural anchors are commonly used in the industry for various structural applications. In <i>ACI 318-19: Building Code Requirements for Structural Concrete and Commentary</i>, a modification factor, λ<i><sub>a</sub></i>, is specified for the calculated design strengths of anchors installed in lightweight concrete that experience concrete or bond failure. The modification factor consists of the general lightweight concrete modification factor,λ, specified in the code multiplied by an
20
(7479359), Cheng Qian. "Evaluation of Deep Learning-Based Semantic Segmentation Approaches for Autonomous Corrosion Detection on Metallic Surfaces." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div> The structural defects can lead to serious safety issues and the corrosponding economic losses. In 2013, it was estimated that 2.5 trillion US dollars were spent on corrosion around the world, which was 3.4\% of the global Gross Domestic Product (GDP) (Koch, 2016). Periodical inspection of corrosion and maintenance of steel structures are essential to minimize these losses. Current corrosion inspection guidelines require inspectors to visually assess every critical member within arm's reach. This process is time-consuming, subjective and labor-intensive, and therefore is done only once e
21
(8800811), Mingmin Liu. "MODELLING OF INTERSTATE I-465 CRASH COUNTS DURING SNOW EVENTS." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p></p>Traffic safety management on interstates is crucial during adverse winter weather. According to the Federal Highway Administration (FHWA), there are over 5,891,000 vehicle crashes each year in the United States. Approximately 21% of these crashes are weather-related. INDOT spends $60 million on winter operations each year to minimize the weather impacts on driver capability, vehicle performance, road infrastructure, and crash risk. Several studies have sought to investigate the relationship of crash counts with weather, speed, traffic and roadway data during snow events, in order to hel
22
(6613415), Leonardo Enrico Bertassello. "Eco-Hydrological Analysis of Wetlandscapes." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>Wetlands are dispersed fractal aquatic habitats that play a key role in watershed eco-hydrology. Wetlands provide critical habitats for specialized fauna and flora, process nutrients, and store water. Wetlands are found in a wide range of landscapes and climates, including humid/tropical regions where surface water is abundant, and in semiarid/arid regions with surface-water deficits. Wetland morphology and hydrology are governed by geomorphology and climate. Wetlands are dynamic; they change in space and time in response to unsteady external conditions, and over longer term to internal p
23
Kovacevic, Vlado S. "The impact of bus stop micro-locations on pedestrian safety in areas of main attraction." 2005. http://arrow.unisa.edu.au:8081/1959.8/28389.
Pełny tekst źródłaStreszczenie:
From the safety point of view, the bus stop is perhaps the most important part of the Bus Public Transport System, as it represents the point where bus passengers may interact directly with other road users and create conflicting situations leading to traffic accidents. For example, travellers could be struck walking to/from or boarding/alighting a bus. At these locations, passengers become pedestrians and at some stage crossing busy arterial roads at the bus stop in areas or at objects of main attraction usually outside of pedestrian designated facilities such as signal controlled intersectio
24
(6411944), Francisco J. Montes Sr. "EFFECTS ON RHEOLOGY AND HYDRATION OF THE ADDITION OF CELLULOSE NANOCRYSTALS (CNC) IN PORTLAND CEMENT." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
Cellulose Nanocrystals have been used in a wide range of applications including cement composites as a strength enhancer. This work analyses the use of CNC from several sources and production methods, and their effects on rheology and hydration of pastes made using different cement types with different compositions. Cement Types I/II and V were used to prepare pastes with different water to cement ratios (w/c) and measure the changes in rheology upon CNC addition. The presence of tricalcium aluminate (cement chemistry denotes as C3A) made a difference in the magnitude of CNC effects. At dosage
25
(7484339), Fu-Chen Chen. "Deep Learning Studies for Vision-based Condition Assessment and Attribute Estimation of Civil Infrastructure Systems." Thesis, 2021.
Znajdź pełny tekst źródłaStreszczenie:
Structural health monitoring and building assessment are crucial to acquire structures’ states and maintain their conditions. Besides human-labor surveys that are subjective, time-consuming, and expensive, autonomous image and video analysis is a faster, more efficient, and non-destructive way. This thesis focuses on crack detection from videos, crack segmentation from images, and building assessment from street view images. For crack detection from videos, three approaches are proposed based on local binary pattern (LBP) and support vector machine (SVM), deep convolution neural network (DCNN)
26
(5930171), Yuxiao Qin. "Sentinel-1 Wide Swath Interferometry: Processing Techniques and Applications." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>The Sentinel-1 (S1) mission is a part of the European Space Agency (ESA) Copernicus program. In 2014 and 2016, the mission launched the twin Synthetic Aperture Radar (SAR) satellites, Sentinel-1A (S1A) and Sentinel-1B (S1B). The S1 mission has started a new era for earth observations missions with its higher spatial resolution, shorter revisit days, more precise control of satellites orbits and the unprecedented free-to-public distribution policy. More importantly, S1 adopts a new wide swath mode, the TOPS mode as it default acquisition mode. The TOPS mode scans several different subswath
27
(9229868), Jephunneh Bonsafo-Bawuah. "AN AGENT-BASED FRAMEWORK FOR INFRASTRUCTURE MAINTENANCE DECISION MAKING." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<div>A transportation system plays a significant role in the economic development of a region by facilitating the movement of goods and services. No matter how well the infrastructure is designed or constructed, it is beneficial to know maintenance needs in the life cycle of the infrastructure so that the service life of the pavement is prolonged by minimizing its life-cycle cost requirements. The pavement life-cycle performance helps maintenance investment decision-makers to efficiently utilize the available infrastructure funds. This research focuses on developing</div><div>a framework for i
28
(9750833), Zilong Yang. "Automated Building Extraction from Aerial Imagery with Mask R-CNN." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>Buildings are one of the fundamental sources of geospatial information for urban planning, population estimation, and infrastructure management. Although building extraction research has gained considerable progress through neural network methods, the labeling of training data still requires manual operations which are time-consuming and labor-intensive. Aiming to improve this process, this thesis developed an automated building extraction method based on the boundary following technique and the Mask Regional Convolutional Neural Network (Mask R-CNN) model. First, assisted by known building
29
(6618812), Harsh Patel. "IMPLEMENTING THE SUPERPAVE 5 ASPHALT MIXTURE DESIGN METHOD IN INDIANA." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
Recent research developments have indicated that asphalt mixture durability and pavement life can be increased by modifying the Superpave asphalt mixture design method to achieve an in-place density of 95%, 2% higher than the conventional density requirements of approximately 93% (7% air voids content). Doing so requires increasing the design air voids content to 5% from the conventional requirement of 4 percent. After successful laboratory testing of this modified mixture design method, known as Superpave 5, two controlled field trials and one full scale demonstration project, the Indiana Dep
30
(7860779), Mohammadreza Pouranian. "Aggregate Packing Characteristics of Asphalt Mixtures." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p><a>Voids
in the mineral aggregate (VMA), as a main volumetric design parameter in the
Superpave mixture design method, is an important factor to ensure asphalt
mixture durability and rutting performance. Moreover, an asphalt mixture’s
aggregate skeleton, related to VMA, is another important factor that affects
critical asphalt mixture properties such as durability, workability,
permeability, rutting, and cracking resistance. The objective of this study is to
evaluate the effects of aggregate size distribution and shape parameters on
aggregate packing characteristics (volumetric and compacti
31
(8065844), Jedadiah Floyd Burroughs. "Influence of Chemical and Physical Properties of Poorly-Ordered Silica on Reactivity and Rheology of Cementitious Materials." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p>Silica fume is a widely
used pozzolan in the concrete industry that has been shown to have numerous
benefits for concrete including improved mechanical properties, refined pore
structure, and densification of the interfacial transition zone between paste
and aggregates. Traditionally, silica
fume is used as a 5% to 10% replacement of cement; however, newer classes of
higher strength concretes use silica fume contents of 30% or greater. At these high silica fume contents, many
detrimental effects, such as poor workability and inconsistent strength
development, become much more prominent.
32
(5930657), Go-Eun Han. "A STUDY ON THE FAILURE ANALYSIS OF THE NEUTRON EMBRITTLED REACTOR PRESSURE VESSEL SUPPORT USING FINITE ELEMENT ANALYSIS." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>One
of the major degradation mechanisms in a nuclear power plant structural or
mechanical component is the neutron embrittlement of the irradiated steel
component. High energy neutrons change the microstructure of the steel, so the
steel loses its fracture toughness. This neutron embrittlement increases the
risk of the brittle fracture. Meanwhile, the reactor pressure vessel support is
exposed in low temperature with high neutron irradiation environment which is
an unfavorable condition for the fracture failure. In this study, the failure
assessment of a reactor pressure vessel support was
33
(6592994), Nicholas R. Olsen. "Long Term Trends in Lake Michigan Wave Climate." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
Waves are a primary factor in beach health, sediment transport, safety, internal nutrient loading, and coastal erosion, the latter of which has increased along Lake Michigan's western coastline since 2014. While high water levels are undoubtedly the primary cause of this erosion, the recent losses may also be indicative of changes in the lake's wind-driven waves. This study seeks to examine long-term trends in the magnitude and direction of Lake Michigan waves, including extreme waves and storm events using buoy measurements (National Data Buoy Center Buoys 45002 and 45007) and the United Stat
34
(7484483), Soohyun Yang. "COUPLED ENGINEERED AND NATURAL DRAINAGE NETWORKS: DATA-MODEL SYNTHESIS IN URBANIZED RIVER BASINS." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p></p><p></p><p></p><p>In
urbanized river basins, sanitary wastewater and urban runoff (non-sanitary
water) from urban agglomerations drain to complex engineered networks, are
treated at centralized wastewater treatment plants (WWTPs) and discharged to
river networks. Discharge from multiple WWTPs distributed in urbanized river
basins contributes to impairments of river water-quality and aquatic ecosystem
integrity. The size and location of WWTPs are determined by spatial patterns of
population in urban agglomerations within a river basin. Economic and
engineering constraints determine the co
35
(8735910), Josept David Revuelta Acosta Sr. "WATER-DRIVEN EROSION PREDICTION TECHNOLOGY FOR A MORE COMPLICATED REALITY." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>Hydrological modeling has been a valuable tool to understand the processes governing water distribution, quantity, and quality of the planet Earth. Through models, one has been able to grasp processes such as runoff, soil moisture, soil erosion, subsurface drainage, plant growth, evapotranspiration, and effects of land use changes on hydrology at field and watershed scales. The number and diversity of water-related challenges are vast and expected to increase. As a result, current models need to be under continuous modifications to extend their application to more complex processes. Several
36
(6620447), Yen-Chen Chiang. "Studies on Aboveground Storgae Tanks Subjeected to Wind Loading: Static, Dynamic, and Computational Fluid Dynamics Analyses." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p>Due
to the slender geometries of aboveground storage tanks, maintaining the
stability under wind gusts of these tanks has always been a challenge.
Therefore, this thesis aims to provide a through insight on the behavior of
tanks under wind gusts using finite element analysis and computational fluid
dynamic (CFD) analysis. The present thesis is composed of three independent
studies, and different types of
analysis were conducted. In Chapter 2, the main purpose is to model the wind
loading dynamically and to investigate whether a resonance can be triggered.
Research on tanks subjected to stat
37
(6622427), Zhe Sun. "APPLICATION OF PHOTOCHEMICAL AND BIOLOGICAL APPROACHES FOR COST-EFFECTIVE ALGAL BIOFUEL." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p>Rapid growth of energy consumption and greenhouse gas emissions from fossil fuels have promoted extensive research on biofuels. <a>Algal biofuels have been considered as a promising and environmentally friendly renewable energy source</a>. However, several limitations have inhibited the development of cost-effective biofuel production, which includes unstable cultivation caused by invading organisms and high cost of lipid extraction. This dissertation aims to investigate photochemical approaches to prevent culture collapse caused by invading organisms and biological approaches for the devel
38
(6594389), Mahsa Modiri-Gharehveran. "INDIRECT PHOTOCHEMICAL FORMATION OF COS AND CS2 IN NATURAL WATERS: KINETICS AND REACTION MECHANISMS." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p></p><p><a>COS and CS<sub>2</sub> are sulfur compounds that are formed
in natural waters. These compounds are also volatile, which leads them move
into the atmosphere and serve as critical precursors to sulfate aerosols.
Sulfate aerosols are known to counteract global warming by reflecting solar
radiation. One major source of COS and CS<sub>2</sub> stems from the ocean. While
previous studies have linked COS and CS<sub>2</sub> formation in these waters to the
indirect photolysis of organic sulfur compounds, much of the chemistry behind
how this occurs remains unclear. This study examined thi
39
(8770325), Anzy Lee. "RIVERBED MORPHOLOGY, HYDRODYNAMICS AND HYPORHEIC EXCHANGE PROCESSES." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>Hyporheic exchange is key to buffer water quality and temperatures in streams and rivers, while also providing localized downwelling and upwelling microhabitats. In this research, the effect of geomorphological parameters on hyporheic exchange has been assessed from a physical standpoint: surface and subsurface flow fields, pressure distribution across the sediment/water interface and the residence time in the bed.<br></p><p>First, we conduct a series of numerical simulations to systematically explore how the fractal properties of bedforms are related to hyporh
40
(5929958), Qinghua Li. "Geospatial Processing Full Waveform Lidar Data." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
This thesis focuses on the comprehensive and thorough studies on the geospatial processing of airborne (full) waveform lidar data, including waveform modeling, direct georeferencing, and precise georeferencing with self-calibration.<div><br></div><div>Both parametric and nonparametric approaches of waveform decomposition are
studied. The traditional parametric approach assumes that the returned waveforms
follow a Gaussian mixture model where each component is a Gaussian. However,
many real examples show that the waveform components can be neither Gaussian
nor symmetric. To address the problem,
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(5930687), Jinglin Jiang. "Investigating How Energy Use Patterns Shape Indoor Nanoaerosol Dynamics in a Net-Zero Energy House." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<p>Research on net-zero energy buildings (NZEBs) has been
largely centered around improving building energy performance, while little
attention has been given to indoor air quality. A critically important class of
indoor air pollutants are nanoaerosols – airborne particulate matter smaller
than 100 nm in size. Nanoaerosols
penetrate deep into the human respiratory system and are associated with
deleterious toxicological and human health outcomes. An important step towards
improving indoor air quality in NZEBs is understanding how occupants, their
activities, and building systems affect the em
42
(5930027), Ganeshchandra Mallya. "DROUGHT CHARACTERIZATION USING PROBABILISTIC MODELS." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>Droughts are complex natural disasters caused due to deficit in water availability over a region. Water availability is strongly linked to precipitation in many parts of the world that rely on monsoonal rains. Recent studies indicate that the choice of precipitation datasets and drought indices could influence drought analysis. Therefore, drought characteristics for the Indian monsoon region were reassessed for the period 1901-2004 using two different datasets and standard precipitation index (SPI), standardized precipitation-evapotranspiration index (SPEI), Gaussian mixture model-based dro
43
(9192656), Yue Ke. "Oh, the Places You'll Move: Urban Mass Transit's Effects on Nearby Housing Markets." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
The last couple of decades have seen a renewed interest among urban transportation planners in light rail transit (LRT) systems in large cities across the United States (US) as a possible means of addressing negative transportation externalities such as congestion and greenhouse gas emissions while encouraging the use of public transit [1]. LRT infrastructure investments have also gained traction as a means of revitalizing decayed urban centres because transportation infrastructure developments are highly correlated with economic growth in surrounding areas [2]. <div>The primary objective of t
44
(9760799), Juan Esteban Suarez Lopez. "CAPACITATED NETWORK BASED PARKING MODELS UNDER MIXED TRAFFIC CONDITIONS." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>New technologies such as electric vehicles,
Autonomous vehicles and transportation platforms are changing the way humanity
move in a dramatic way and cities around the world need to adjust to this rapid
change brought by technology. One of the aspects more challenging for urban
planners is the parking problem as the new increase or desire for these private
technologies may increase traffic congestion and change the parking
requirements across the city. For example, Electric vehicles will need parking
places for both parking and charging and Autonomous vehicles could increase the
congestion
45
(9045878), Mitra Khanibaseri. "Developing Artificial Neural Networks (ANN) Models for Predicting E. Coli at Lake Michigan Beaches." Thesis, 2020.
Znajdź pełny tekst źródłaStreszczenie:
<p>A neural
network model was developed to predict the E. Coli levels and classes in six
(6) select Lake Michigan beaches. Water quality observations at the time of
sampling and discharge information from two close tributaries were used as
input to predict the E. coli. This research was funded by the Indiana Department
of Environmental Management (IDEM). A user-friendly Excel Sheet based tool was
developed based on the best model for making future predictions of E. coli
classes. This tool will facilitate beach managers to take real-time decisions.</p>
<p>The nowcast
model was developed based
46
(7036595), KwangHyuk Im. "ASSESSMENT MODEL FOR MEASURING CASCADING ECONOMIC IMPACTS DUE TO SEVERE WEATHER-INDUCED POWER OUTAGES." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
This research has developed an assessment model and framework to measure cascading economic impacts in terms of gross domestic product (GDP) loss due to severe weather-induced power outages. The major objectives of this research were to (1) identify physical correlations between different industries within an economic system, (2) define deterministic relationships through the values of interconnectedness and interdependency between 71 industries, (3) complete probabilistic estimation of economic impacts using historical economic data spanning from 1997 to 2016, and (4) develop an assessment mo
47
(6611465), Nathaniel J. Shellhamer. "Direct Demand Estimation for Bus Transit in Small Cities." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>
<p>Public
transportation is vital for many people who do not have the means to use other
forms of transportation. In small
communities, transit service is often limited, due to funding constraints of
the transit agency. In order to maximize
the use of available funding resources, agencies strive to provide effective
and efficient service that meets the needs of as many people as possible. To do this, effective service planning is
critical.</p>
<p> </p>
<p>Unlike
traditional road-based transportation projects, transit service modifications
can be implemented over the span of just a
48
(10693164), Chen Ma. "Modeling Alternatives for Implementing the Point-based Bundle Block Adjustment." Thesis, 2021.
Znajdź pełny tekst źródłaStreszczenie:
<div>This thesis examines the multilinear equations of the calibrated pinhole camera. </div><div>The multilinear equations describe the linear relations between camera parameters and image observations in matrix or tensor formats. </div><div>This thesis includes derivations and analysis of the trilinear equations through the point feature relation. For the four-frame and more than four frame cases, this paper gives derivations and analysis using a combination of the bilinear and trilinear equations to represent general multi-frame point geometry. As a result, a three-frame model (TFM) for gene
49
(5929718), Yuntao Guo. "Leveraging Information Technologies and Policies to Influence Short- and Long-term Travel Decisions." Thesis, 2019.
Znajdź pełny tekst źródłaStreszczenie:
<div>Growing automobile dependency and usage continue to exacerbate traffic congestion, air pollution, and physical inactivity in metropolitan areas. Extensive efforts have been made to leverage advanced technology and related policies to influence short- (within-day and day-to-day) and long-term (mobility and lifestyle) travel decisions to address these issues from the system operator and individual traveler perspectives. However, most studies have yet to address system operator and individual traveler needs together; provide sufficient understanding of the impacts of such technologies on saf
50
(10692402), Jorge Alfredo Rojas Rondan. "A BIM-based tool for formwork management in building projects." Thesis, 2021.
Znajdź pełny tekst źródłaStreszczenie:
A BIM-based tool for formwork management was developed using Dynamo Studio and Revit, based on practitioners preferences regarding LOD and rental option. The BIM tool is a toolset of Dynamo scripts able to create a BIM model for formwork enable with parameters that describes formwork features necessary for formwork management. The BIM model created with this toolset is able to compute quantities, cost analysis, generate a demand profile, and cerate a 4D & 5D simulation automatically.