You searched for subject:(high resolution advective flow field).
Showing records 1 – 30 of
68361 total matches.
◁ [1] [2] [3] [4] [5] … [2279] ▶
1.
Taylor, Kendrick C.
Application of borehole geophysical methods to shallow groundwater investigations.
Degree: 1987, University of Nevada – Reno
URL: http://hdl.handle.net/11714/1743 
► Borehole geophysical methods have been used extensively for petroleum and mineral exploration; but due to differences in environment and survey objective, modifications of both equipment…
(more)
▼ Borehole geophysical methods have been used extensively for petroleum and mineral exploration; but due to differences in environment and survey objective, modifications of both equipment and interpretation are necessary for shallow groundwater applications. These applications require the use of complementary borehole measurements which can be related to the formation properties by comparison to core samples. Different interpretation strategies must be developed for different environments, strategies for use in unsaturated, saturated with clay present, saturated without clay present, and hydraulically anisotropic environments are developed. Parameters that can be determined are porosity, moisture content, hydraulic conductivity, groundwater velocity, cation exchange content, and pore fluid conductivity. All logging instrumentation measures a property over a short interval of the well. It is important when combining logs to insure that all logs used in the comparison are vertical averages of the same portion with respect to both depth and length of the well. It is also possible to reduce the effect of the vertical averaging by the instrumentation through the use of numerical techniques. A
field example is used to demonstrate these methods. The techniques presented make it practical to determine a formation hydraulic properties on a scale of a few tens of centimeters. This
high resolution distribution of the formation in turn permits the development of a class of contaminate transport models which utilize the
high resolution description of the aquifer variability. These models do not require large scale dependent dispersity terms to match
field data because the contaminate movement is realistically described by shear
flow in the
high resolution advective flow field of the model. A one dimensional model is presented as an example of this class of model.
Advisors/Committee Members: Wheatcraft, Stephen (advisor).
Subjects/Keywords: borehole geophysical methods; petroleum exploration; mineral exploration; environment; survey objective; modifications of equipment; modifications of interpretation; shallow groundwater applications; complimentary borehole measurements; formation properties; core; clay; samples; interpretation strategies; unsaturated with clay present; saturated with clay present; saturated without clay present; hydraulically anisotropic environments; porosity; moisture content; hydraulic conductivity; groundwater velocity; cation exchange content; pore fluid conductivity; logging instrumentation measures; wells; logs; vertical averages; depth of wells; length of wells; numerical techniques; formation hydraulic properties; high resolution distribution; contaminate transport models; high resolution description; aquifer variability; dependent diversity; contaminate movement; shear flow; high resolution advective flow field; Mackay Science Project; groundwater – sampling; groundwater flow; hydraulic measurements; hydrogeology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Taylor, K. C. (1987). Application of borehole geophysical methods to shallow groundwater investigations. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/1743
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Taylor, Kendrick C. “Application of borehole geophysical methods to shallow groundwater investigations.” 1987. Thesis, University of Nevada – Reno. Accessed March 05, 2021.
http://hdl.handle.net/11714/1743.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Taylor, Kendrick C. “Application of borehole geophysical methods to shallow groundwater investigations.” 1987. Web. 05 Mar 2021.
Vancouver:
Taylor KC. Application of borehole geophysical methods to shallow groundwater investigations. [Internet] [Thesis]. University of Nevada – Reno; 1987. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11714/1743.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Taylor KC. Application of borehole geophysical methods to shallow groundwater investigations. [Thesis]. University of Nevada – Reno; 1987. Available from: http://hdl.handle.net/11714/1743
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Vanderbilt University
2.
Kelm, Nathaniel David.
High Resolution 3D Diffusion Kurtosis Imaging of Whole Rat Brain.
Degree: MS, Biomedical Engineering, 2014, Vanderbilt University
URL: http://hdl.handle.net/1803/11318
► This thesis involves the development of an overnight high-resolution 3D diffusion kurtosis imaging protocol for ex vivo whole rat brain imaging. MRI acquisition parameters were…
(more)
▼ This thesis involves the development of an overnight
high-
resolution 3D diffusion kurtosis imaging protocol for ex vivo whole rat brain imaging. MRI acquisition parameters were optimized in order to obtain
high-
resolution,
high-precision diffusion kurtosis imaging data. This included the programming and development of a 3D diffusion-weighted fast spin-echo pulse sequence. Image data from ex vivo rat brains were collected to verify the efficacy of the imaging protocol. Values of diffusion kurtosis parameters in normal rat brains were similar to those reported in previous imaging studies. Using this protocol, preliminary data were collected from a model of schizophrenia in rats. These data indicated the ability of the protocol to detect changes in diffusion kurtosis parameters that could correlate to changes in white matter microstructure.
Advisors/Committee Members: Adam Anderson (committee member), Mark D. Does (Committee Chair).
Subjects/Keywords: high resolution; magnetic resonance imaging; diffusion kurtosis imaging; ultra-high field; ex vivo rat brain
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kelm, N. D. (2014). High Resolution 3D Diffusion Kurtosis Imaging of Whole Rat Brain. (Thesis). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/11318
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kelm, Nathaniel David. “High Resolution 3D Diffusion Kurtosis Imaging of Whole Rat Brain.” 2014. Thesis, Vanderbilt University. Accessed March 05, 2021.
http://hdl.handle.net/1803/11318.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kelm, Nathaniel David. “High Resolution 3D Diffusion Kurtosis Imaging of Whole Rat Brain.” 2014. Web. 05 Mar 2021.
Vancouver:
Kelm ND. High Resolution 3D Diffusion Kurtosis Imaging of Whole Rat Brain. [Internet] [Thesis]. Vanderbilt University; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1803/11318.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kelm ND. High Resolution 3D Diffusion Kurtosis Imaging of Whole Rat Brain. [Thesis]. Vanderbilt University; 2014. Available from: http://hdl.handle.net/1803/11318
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
3.
Falco, Mariachiara.
Analysis of high resolution observations of sunspots fine structures.
Degree: 2016, Università degli Studi di Catania
URL: http://hdl.handle.net/10761/3859
► This Ph.D. thesis deals with the study of the interaction between plasma and magnetic fields on the Sun. Observations acquired during two observing campaigns, one…
(more)
▼ This Ph.D. thesis deals with the study of the interaction between plasma and magnetic fields on the Sun. Observations acquired during two observing campaigns, one at the Solar Swedish Tower and the other at the Richard B. Dunn Solar Telescope, provided high-resolution data which were used to study the details of some phenomena occurring in the Sun.
In particular, this work aims to extend and consolidate our knowledge on the formation and evolution of sunspots observed in the solar photosphere. The first aspect which was investigated concerns the study of the mechanism of the penumbra formation in a sunspot. In this regard, I give my contribution in explaining the behaviour of the magnetic field forming the penumbral filaments. A second aspect concerns the study of the kinematic and magnetic properties of a light bridge separating
into two parts the umbra of a sunspot. I found that there is a relationship between the upflow motions in the light bridge dark lane and the magnetic field configuration. The third aspect concerns the study of the
properties of granules in a light bridge and in the quiet Sun using a new algorithm developed in collaboration with the Department of Mathematics of the University of Catania. In particular, I compared the size, mean continuum intensity and Doppler velocity between the granules forming the light bridge and those of the quiet Sun. In the conclusion, I give my interpretation of the observed phenomena and suggest future observations to confirm these results and support theoretical models.
Subjects/Keywords: Area 02 - Scienze fisiche; Sun, photosphere, sunspots, granulation, light bridge, magnetic field, high resolution observations.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Falco, M. (2016). Analysis of high resolution observations of sunspots fine structures. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/3859
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Falco, Mariachiara. “Analysis of high resolution observations of sunspots fine structures.” 2016. Thesis, Università degli Studi di Catania. Accessed March 05, 2021.
http://hdl.handle.net/10761/3859.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Falco, Mariachiara. “Analysis of high resolution observations of sunspots fine structures.” 2016. Web. 05 Mar 2021.
Vancouver:
Falco M. Analysis of high resolution observations of sunspots fine structures. [Internet] [Thesis]. Università degli Studi di Catania; 2016. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10761/3859.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Falco M. Analysis of high resolution observations of sunspots fine structures. [Thesis]. Università degli Studi di Catania; 2016. Available from: http://hdl.handle.net/10761/3859
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Murabito, Mariarita.
Analysis of the penumbra formation in sunspots.
Degree: 2018, Università degli Studi di Catania
URL: http://hdl.handle.net/10761/3972
► The formation of the penumbra in sunspots is a physical process which involve the coupling between the plasma and the magnetic field in different layers…
(more)
▼ The formation of the penumbra in sunspots is a physical process which involve the coupling between the plasma and the magnetic field in different layers of the solar atmosphere. Its study requires long time series of observations carried out with high temporal, spatial, and spectral resolution. Moreover, due to few available datasets of this phase of the sunspot evolution, the physical processes at the base of the penumbra formation are still unclear. For this reason in this thesis I performed some observational analysis of the penumbra formation using high resolution data acquired during an observing campaign at the Richard B. Dunn Solar Telescope (NSO) and data taken by HMI onboard of SDO.
Two main aspects have been investigated: the location of the stable settlement of the first penumbra filaments and the transition from inverse to classical Evershed flow.
Using the high resolution images I observed the first settlement of the penumbra filaments in the two polarities of AR NOOA 11490. Before the penumbra formation the pore of the preceding polarity exhibits an annular zone characterized by a magnetic field greater than 1000 G, having an (upside down) ballerina skirt structure of the magnetic field. In this case, the penumbra starts to form in the side away from the opposite polarity, in agreement with the observations of Schlichenmaier et al. (2010). On the other hand, using the same dataset, I showed that in the following polarity of the AR NOAA 11490 a stable penumbra forms in the area facing the opposite polarity, located below an AFS, i.e. in a flux emergence region.
Moreover, considering a sample of other six ARs observed by HMI, I found that there is no preferred location for the penumbra formation.
I interpreted the formation of the penumbra as due to the field lines of the magnetic canopy, already existing at a higher level of the solar atmosphere and overlying the pore, which sink down into the photosphere and below the solar surface. In fact, in this case there is a non-zero probability of finding near-horizontal field also in the region between the two main sunspots, as shown by the recent simulations of MacTaggart et al. (2016).
Concerning the transition from inverse to classical Evershed flow, in the preceding polarity of AR NOAA 11490 I found changes in the direction of the LOS velocity field during the formation of the first penumbral sector. In about 1-3 hours the LOS velocity became coherent with the Evershed flow pattern while the penumbra was completely formed. I also found observational evidences of this transition in most of the pores of my sample observed by HMI. Therefore, I proposed a new model to explain this transition in the velocity field, based on the presence of small U-loops, which are able to drive a siphon flow toward the pore, i.e., corresponding to the inverse Evershed flow, before the penumbra formation.
The thesis is organized as follows: in Chapter 1 I provide a brief introduction on the characteristics of the solar active regions. Chapter 2 describes the main features…
Subjects/Keywords: Area 02 - Scienze fisiche; Sun, photosphere, sunspots, magnetic field, high resolution observations.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Murabito, M. (2018). Analysis of the penumbra formation in sunspots. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/3972
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Murabito, Mariarita. “Analysis of the penumbra formation in sunspots.” 2018. Thesis, Università degli Studi di Catania. Accessed March 05, 2021.
http://hdl.handle.net/10761/3972.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Murabito, Mariarita. “Analysis of the penumbra formation in sunspots.” 2018. Web. 05 Mar 2021.
Vancouver:
Murabito M. Analysis of the penumbra formation in sunspots. [Internet] [Thesis]. Università degli Studi di Catania; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10761/3972.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Murabito M. Analysis of the penumbra formation in sunspots. [Thesis]. Università degli Studi di Catania; 2018. Available from: http://hdl.handle.net/10761/3972
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado School of Mines
5.
Guyader, Meaghan E.
Interpreting sources and endocrine active components of trace organic contaminant mixtures in Minnesota lakes.
Degree: PhD, Civil and Environmental Engineering, 2019, Colorado School of Mines
URL: http://hdl.handle.net/11124/172888
► On-site wastewater treatment systems (OWTSs) are a suspected source of widespread trace organic contaminant (TOrC) occurrence in Minnesota lakes. TOrCs are a diverse set of…
(more)
▼ On-site wastewater treatment systems (OWTSs) are a suspected source of widespread trace organic contaminant (TOrC) occurrence in Minnesota lakes. TOrCs are a diverse set of synthetic and natural chemicals regularly used as cleaning agents, personal care products, medicinal substances, herbicides and pesticides, and foods or flavorings. Wastewater streams are known to concentrate TOrC discharges to the environment, particularly accumulating these chemicals at outfalls from centralized wastewater treatment plants. Fish inhabiting these effluent dominated environments are also known to display intersex qualities. Concurrent evidence of this phenomenon, known as endocrine disruption, in Minnesota lake fish drives hypotheses that OWTSs, the primary form of wastewater treatment in shoreline residences, may contribute to TOrC occurrence and the endocrine activity in these water bodies. The causative agents specific to fish in this region remain poorly understood. The objective of this dissertation was to investigate OWTSs as sources of TOrCs in Minnesota lakes, and TOrCs as potential causative agents for endocrine disruption in resident fish. Three research efforts were executed to investigate these topics: examining chemical and biological signatures of OWTS proximity in Minnesota lakes (Chapter 2), prioritizing potential causative agents of endocrine disruption using liquid chromatography tandem mass spectrometry (LC-HRMS) (Chapter 3), and conducting a suspect search of OWTS-associated LC-HRMS features at an adjacent Minnesota lake (Chapter 4). In Chapter 2, traditional targeted aqueous analyses indicated higher concentrations of TOrCs at locations more proximal to residences with OWTSs. Residential proximity also corresponded to feminization of male sunfish. The particular contaminants detected at these locations are considered weak indicators of wastewater presence in environmental compartments and inactive with current metrics for endocrine activity. Unexpected features unique to sites with pronounced endocrine disruption were identified in Chapter 3; however, these components were still considered endocrine inactive by current toxicology metrics. This suggests that temporal
resolution in sampling was too low for this chronic-toxicity endpoint, or current regulatory efforts underestimate the effects of these contaminants as environmental mixtures. Finally, Chapter 5 indicated that LC-HRMS analysis and passive sampling allowed for identification of a broader suite of OWTS-associated compounds in adjacent lake water, but that higher spatial
resolution was required to refine lake-specific OWTS-compound interest lists. The results from this dissertation encourage further investigation of residential inputs of TOrCs to Minnesota lakes, particularly prioritizing locations with endocrine disruption, so that local regulatory agencies may effectively manage these highly valued state resources.
Advisors/Committee Members: Higgins, Christopher P. (advisor), Bellona, Christopher (committee member), McCray, John E. (committee member), Furlong, Edward T. (committee member), Ranville, James F. (committee member).
Subjects/Keywords: field monitoring; Minnesota; trace organic contaminants; high resolution mass spectrometry; endocrine disruption; on-site wastewater
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Guyader, M. E. (2019). Interpreting sources and endocrine active components of trace organic contaminant mixtures in Minnesota lakes. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/172888
Chicago Manual of Style (16th Edition):
Guyader, Meaghan E. “Interpreting sources and endocrine active components of trace organic contaminant mixtures in Minnesota lakes.” 2019. Doctoral Dissertation, Colorado School of Mines. Accessed March 05, 2021.
http://hdl.handle.net/11124/172888.
MLA Handbook (7th Edition):
Guyader, Meaghan E. “Interpreting sources and endocrine active components of trace organic contaminant mixtures in Minnesota lakes.” 2019. Web. 05 Mar 2021.
Vancouver:
Guyader ME. Interpreting sources and endocrine active components of trace organic contaminant mixtures in Minnesota lakes. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2019. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11124/172888.
Council of Science Editors:
Guyader ME. Interpreting sources and endocrine active components of trace organic contaminant mixtures in Minnesota lakes. [Doctoral Dissertation]. Colorado School of Mines; 2019. Available from: http://hdl.handle.net/11124/172888
NSYSU
6.
Hsieh, Hsin-Feng.
Study of Chip-Level EMI Based on Near-Field Measurement Techniques.
Degree: Master, Electrical Engineering, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808112-141615
► This thesis proposed a near-field electromagnetic interference measurement framework to obtain sensitivity and spatial resolution of the characteristic parameters of magnetic probe based on International…
(more)
▼ This thesis proposed a near-
field electromagnetic interference measurement framework to obtain sensitivity and spatial
resolution of the characteristic parameters of magnetic probe based on International Electrotechnical Commission proposed for integrated circuits electromagnetic radiation measurement standards IEC 61967-6 : magnetic probe method. Using cross-coupled planar microwave bandpass filter which is realized by glass fiber board (FR4) for near-
field measurement and electromagnetic simulation in comparsion. Nowadays, integrated circuits has become an important source of energy of overall electromagnetic interference in electronic systems. Finally, do near-
field scanning measurement for a 64-pin wire-bond quad flat nonlead (WB-QFN) package and the voltage-controlled oscillator chip in 0.18 μm CMOS technology by using
high scanning
resolution of microprobe. Then observes the chip-level and package-level electromagnetic interference, and achieve chip-level of near-
field electromagnetic interference measurement techniques.
Advisors/Committee Members: Chia-Chan Chang (chair), Lih-Tyng Hwang (chair), Tzyy-Sheng Horng (committee member), Sheng-Fuh Chang (chair), Chia-Chan Chang (chair), Lih-Tyng Hwang (chair), Huey-Ru Chuang (chair).
Subjects/Keywords: Near-Field measurement techniques; Magnetic probe method; High resolution near-field microprobe; Chip-Level EMI; IEC 61967
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hsieh, H. (2012). Study of Chip-Level EMI Based on Near-Field Measurement Techniques. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808112-141615
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hsieh, Hsin-Feng. “Study of Chip-Level EMI Based on Near-Field Measurement Techniques.” 2012. Thesis, NSYSU. Accessed March 05, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808112-141615.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hsieh, Hsin-Feng. “Study of Chip-Level EMI Based on Near-Field Measurement Techniques.” 2012. Web. 05 Mar 2021.
Vancouver:
Hsieh H. Study of Chip-Level EMI Based on Near-Field Measurement Techniques. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Mar 05].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808112-141615.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hsieh H. Study of Chip-Level EMI Based on Near-Field Measurement Techniques. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808112-141615
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
7.
Rampi, Lian Pamela.
Evaluating state-of-the-art remotely sensed data and methods for mapping wetlands in Minnesota.
Degree: PhD, Natural Resources Science and Management, 2013, University of Minnesota
URL: http://hdl.handle.net/11299/162515
► Appropriate management of our natural resources requires constant improvement and update of natural resource inventories. Remote sensing data and techniques offer an effective way to…
(more)
▼ Appropriate management of our natural resources requires constant improvement and update of natural resource inventories. Remote sensing data and techniques offer an effective way to map and estimate changes in our current natural resources. The research presented in this dissertation will demonstrate state-of-the art remote sensing based methods for mapping natural and man-made features, including wetlands, general land cover, and building footprints. High resolution remotely sensed data used in this research included: lidar (light detection and ranging) data (low and high lidar posting density) and multispectral (NIR, blue, green and red bands) leaf-off aerial imagery.This research examined high resolution lidar data through the evaluation of various lidar posting densities and their influence on the accuracy of building footprints and DEMs. The lidar DEM analysis was extended by creating a Compound Topographic Index (CTI) from the DEM to evaluate the potential of the CTI's information for identifying wetland's location. Finally, the results from the second chapter were integrated into the third chapter by combining CTI, high resolution imagery, Digital Surface Model (DSM) and lidar intensity for mapping four land cover classes, including: wetlands, urban, agricultural and forest. A state-of-the-art remote sensing technique known as Object-Based Image Analysis (OBIA) was used to integrate lidar derived products and high resolution imagery. Results and findings of this research are important in two ways: First, advancing the understanding of lidar and lidar derivatives for mapping natural and manmade landscape features. Second, providing needed information to the scientific and civilian community, particularly in the state of Minnesota, to help with the process of updating wetland inventories such as the NWI and increasing the accuracy of mapping wetlands efforts with state-of-the-art techniques.
Subjects/Keywords: Flow direction algorithms; High resolution imagery; Lidar; Object Based Image Analysis (OBIA); Wetlands
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rampi, L. P. (2013). Evaluating state-of-the-art remotely sensed data and methods for mapping wetlands in Minnesota. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/162515
Chicago Manual of Style (16th Edition):
Rampi, Lian Pamela. “Evaluating state-of-the-art remotely sensed data and methods for mapping wetlands in Minnesota.” 2013. Doctoral Dissertation, University of Minnesota. Accessed March 05, 2021.
http://hdl.handle.net/11299/162515.
MLA Handbook (7th Edition):
Rampi, Lian Pamela. “Evaluating state-of-the-art remotely sensed data and methods for mapping wetlands in Minnesota.” 2013. Web. 05 Mar 2021.
Vancouver:
Rampi LP. Evaluating state-of-the-art remotely sensed data and methods for mapping wetlands in Minnesota. [Internet] [Doctoral dissertation]. University of Minnesota; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11299/162515.
Council of Science Editors:
Rampi LP. Evaluating state-of-the-art remotely sensed data and methods for mapping wetlands in Minnesota. [Doctoral Dissertation]. University of Minnesota; 2013. Available from: http://hdl.handle.net/11299/162515
University of Minnesota
8.
Mahajan, Ankit.
New Approaches for Printed Electronics Manufacturing.
Degree: PhD, Material Science and Engineering, 2015, University of Minnesota
URL: http://hdl.handle.net/11299/175521
► In printed electronics, electronic inks are patterned onto flexible substrates using roll-to-roll (R2R) compatible graphic printing methods. For applications where large-area, conformal electronics are necessary,…
(more)
▼ In printed electronics, electronic inks are patterned onto flexible substrates using roll-to-roll (R2R) compatible graphic printing methods. For applications where large-area, conformal electronics are necessary, printed electronics holds a competitive advantage over rigid, semiconductor circuitry, which does not scale efficiently to large areas. However, in order to fully realize the true potential of printed electronics, several manufacturing hurdles need to be overcome. Firstly, minimum feature sizes produced by graphic printing methods are typically greater than 25 µm, which is at least an order of magnitude higher for dense, high performing electronics. In this thesis, conductive features down to 1.5 µm are demonstrated using a novel inkjet printing-based process. Secondly, high-resolution printed conductors usually have poor current-carrying capacity, especially for longer wires in large-area applications. This thesis explores the fundamentals of aerosol-jet printing and reveals the regime for printing high-resolution lines with excellent current carrying capacity. Additionally, a novel manufacturing process is demonstrated, which can process 2.5 µm wide conductive wires with linear resistances as small as 5 Ω mm-1. Another challenge for printed electronics manufacturing is to deal with topography produced on the substrate surface by printed features. Besides complicating the subsequent use of contact-printing methods, surface topography is a source of poor device yields as well. This thesis describes two novel methodologies of creating topography-free printed surfaces. In the first method, nanometer-level smooth, planarized silver lines are obtained using a transfer printing approach. In the second method, open microchannels, imprinted in plastic substrates, are filled with a controlled amount of metal using liquid-based additive processes, to obtain conductive wires flush with the substrate surface. Finally, this thesis addresses the issue of overlay alignment, which is the most significant challenge of printed electronics manufacturing. Multi-layered electronic devices require alignment of multiple layers of different materials with micron-level tolerances, which is a daunting task to accomplish on deformable, moving substrates in R2R production formats. This thesis describes a novel, self-aligned manufacturing strategy for printed electronics that relies on capillary flow of inkjet-printed inks within open micro-channels. Multi-level trench networks, pre-engineered on the substrate surface, are sequentially filled with different inks which, upon drying, form stacked layers of electronic materials. Using this approach, fully self-aligned fabrication of all the major building blocks of an integrated circuit is demonstrated. Overall, this thesis presents several new manufacturing avenues for realizing high-performing and dense electronics on plastic by R2R processing.
Subjects/Keywords: capillary flow; flexible electronics; high-resolution printing; printed electronics; self-aligned printing
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mahajan, A. (2015). New Approaches for Printed Electronics Manufacturing. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/175521
Chicago Manual of Style (16th Edition):
Mahajan, Ankit. “New Approaches for Printed Electronics Manufacturing.” 2015. Doctoral Dissertation, University of Minnesota. Accessed March 05, 2021.
http://hdl.handle.net/11299/175521.
MLA Handbook (7th Edition):
Mahajan, Ankit. “New Approaches for Printed Electronics Manufacturing.” 2015. Web. 05 Mar 2021.
Vancouver:
Mahajan A. New Approaches for Printed Electronics Manufacturing. [Internet] [Doctoral dissertation]. University of Minnesota; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/11299/175521.
Council of Science Editors:
Mahajan A. New Approaches for Printed Electronics Manufacturing. [Doctoral Dissertation]. University of Minnesota; 2015. Available from: http://hdl.handle.net/11299/175521
Leiden University
9.
Versluis, M.J.
Technical developments for clinical MR applications at 7 T.
Degree: 2013, Leiden University
URL: http://hdl.handle.net/1887/20590
► The aim of this thesis was to develop methods to enable the use of 7 Tesla MRI in clinical practice. A number of technical developments…
(more)
▼ The aim of this thesis was to develop methods to enable the use of 7 Tesla MRI in clinical practice. A number of technical developments have been performed to facilitate clinical studies and to achieve the full potential of
high field. Studies have been performed for imaging of different anatomies of the human body, including visualization of the right coronary artery and
high resolution imaging of the brain in patients with neurodegenerative diseases
Advisors/Committee Members: Webb, A.G., Buchem, M.A. van, Osch, M.J.P. van, Leiden University.
Subjects/Keywords: Radiology; MRI; High resolution imaging; High field; 7 Tesla
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Versluis, M. J. (2013). Technical developments for clinical MR applications at 7 T. (Doctoral Dissertation). Leiden University. Retrieved from http://hdl.handle.net/1887/20590
Chicago Manual of Style (16th Edition):
Versluis, M J. “Technical developments for clinical MR applications at 7 T.” 2013. Doctoral Dissertation, Leiden University. Accessed March 05, 2021.
http://hdl.handle.net/1887/20590.
MLA Handbook (7th Edition):
Versluis, M J. “Technical developments for clinical MR applications at 7 T.” 2013. Web. 05 Mar 2021.
Vancouver:
Versluis MJ. Technical developments for clinical MR applications at 7 T. [Internet] [Doctoral dissertation]. Leiden University; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1887/20590.
Council of Science Editors:
Versluis MJ. Technical developments for clinical MR applications at 7 T. [Doctoral Dissertation]. Leiden University; 2013. Available from: http://hdl.handle.net/1887/20590
Universidade Nova
10.
Shrestra, Sanjeevan.
Improved fully convolutional network with conditional random field for building extraction.
Degree: 2018, Universidade Nova
URL: https://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/33652
► Building extraction from remotely sensed imagery plays an important role in urban planning, disaster management, navigation, updating geographic databases and several other geospatial applications. Several…
(more)
▼ Building extraction from remotely sensed imagery plays an important role in urban planning,
disaster management, navigation, updating geographic databases and several other geospatial
applications. Several published contributions are dedicated to the applications of Deep Convolutional
Neural Network (DCNN) for building extraction using aerial/satellite imagery exists;
however, in all these contributions a good accuracy is always paid at the price of extremely
complex and large network architectures. In this paper, we present an enhanced Fully Convolutional
Network (FCN) framework especially molded for building extraction of remotely sensed
images by applying Conditional Random
Field (CRF). The main purpose here is to propose
a framework which balances maximum accuracy with less network complexity. The modern
activation function called Exponential Linear Unit (ELU) is applied to improve the performance
of the Fully Convolutional Network (FCN), resulting in more, yet accurate building prediction. To
further reduce the noise (false classified buildings) and to sharpen the boundary of the buildings,
a post processing CRF is added at the end of the adopted Convolutional Neural Network (CNN)
framework. The experiments were conducted on Massachusetts building aerial imagery. The
results show that our proposed framework outperformed FCN baseline, which is the existing
baseline framework for semantic segmentation, in term of performance measure, the F1-score
and Intersection Over Union (IoU) measure. Additionally, the proposed method stood superior to
the pre-existing classifier for building extraction using the same dataset in terms of performance
measure and network complexity at once.
Advisors/Committee Members: Vanneschi, Leonardo, Hillen, Florian, Museros, Lledó.
Subjects/Keywords: Building Extraction; High Resolution Aerial Imagery; Deep Learning; Deep Convolutional Neural Network; Fully Convolutional Network; Conditional Random Field
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shrestra, S. (2018). Improved fully convolutional network with conditional random field for building extraction. (Thesis). Universidade Nova. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/33652
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shrestra, Sanjeevan. “Improved fully convolutional network with conditional random field for building extraction.” 2018. Thesis, Universidade Nova. Accessed March 05, 2021.
https://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/33652.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shrestra, Sanjeevan. “Improved fully convolutional network with conditional random field for building extraction.” 2018. Web. 05 Mar 2021.
Vancouver:
Shrestra S. Improved fully convolutional network with conditional random field for building extraction. [Internet] [Thesis]. Universidade Nova; 2018. [cited 2021 Mar 05].
Available from: https://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/33652.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shrestra S. Improved fully convolutional network with conditional random field for building extraction. [Thesis]. Universidade Nova; 2018. Available from: https://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/33652
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oxford
11.
Haibo, E.
Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy.
Degree: PhD, 2013, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:19c3b989-0ffb-487f-8cb3-f6e9dea83e63
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588426
► This thesis concerns the application of aberration corrected scanning transmission electron microscopy (STEM) to the quantitative analysis of industrial Pd-Pt core-shell catalyst nanoparticles. High angle…
(more)
▼ This thesis concerns the application of aberration corrected scanning transmission electron microscopy (STEM) to the quantitative analysis of industrial Pd-Pt core-shell catalyst nanoparticles. High angle annular dark field imaging (HAADF), an incoherent imaging mode, is used to determine particle size distribution and particle morphology of various particle designs with differing amounts of Pt coverage. The limitations to imaging, discrete tomography and spectral analysis imposed by the sample’s sensitivity to the beam are also explored. Since scattered intensity in HAADF is strongly dependent on both thickness and composition, determining the three dimensional structure of a particle and its bimetallic composition in each atomic column requires further analysis. A quantitative method was developed to interpret single images, obtained from commercially available microscopes, by analysis of the cross sections of HAADF scattering from individual atomic columns. This technique uses thorough detector calibrations and full dynamical simulations in order to allow comparison between experimentally measured cross section to simulated ones and is shown to be robust to many experimental parameters. Potential difficulties in its applications are discussed. The cross section approach is tested on model materials before applying it to the identification of column compositions of core-shell nanoparticles. Energy dispersive X-ray analysis is then used to provide compositional sensitivity. The potential sources of error are discussed and steps towards optimisation of experimental parameters presented. Finally, a combination of HAADF cross section analysis and EDX spectrum imaging is used to investigate the core-shell nanoparticles and the results are correlated to findings regarding structure and catalyst activity from other techniques. The results show that analysis by cross section combined with EDX spectrum mapping shows great promise in elucidating the atom-by-atom composition of individual columns in a core-shell nanoparticle. However, there is a clear need for further investigation to solve the thickness / composition dualism.
Subjects/Keywords: 620.5; Atomic scale structure and properties; Electron image analysis; High resolution microscopy; Nanostructures; atomic resolution; high resolution; electron microscopy; high angle annular dark field; catalyst; nanoparticles; energy dispersive X-ray analysis; specimen damage
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Haibo, E. (2013). Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:19c3b989-0ffb-487f-8cb3-f6e9dea83e63 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588426
Chicago Manual of Style (16th Edition):
Haibo, E. “Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy.” 2013. Doctoral Dissertation, University of Oxford. Accessed March 05, 2021.
http://ora.ox.ac.uk/objects/uuid:19c3b989-0ffb-487f-8cb3-f6e9dea83e63 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588426.
MLA Handbook (7th Edition):
Haibo, E. “Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy.” 2013. Web. 05 Mar 2021.
Vancouver:
Haibo E. Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy. [Internet] [Doctoral dissertation]. University of Oxford; 2013. [cited 2021 Mar 05].
Available from: http://ora.ox.ac.uk/objects/uuid:19c3b989-0ffb-487f-8cb3-f6e9dea83e63 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588426.
Council of Science Editors:
Haibo E. Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy. [Doctoral Dissertation]. University of Oxford; 2013. Available from: http://ora.ox.ac.uk/objects/uuid:19c3b989-0ffb-487f-8cb3-f6e9dea83e63 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588426
Indian Institute of Science
12.
Gopalakrishna, N.
On Three Dimensional High Lift Flow Computations.
Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3127
► Computing 3D high lift flows has been a challenge to the CFD community because of three important reasons: complex physics, complex geometries and large computational…
(more)
▼ Computing 3D
high lift flows has been a challenge to the CFD community because of three important reasons: complex physics, complex geometries and large computational requirements. In the recent years, considerable progress has been made in understanding the suitability of various CFD solvers in computing 3D
high lift flows, through the systematic studies carried out under
High Lift Prediction workshops. The primary focus of these workshops is to assess the ability of the CFD solvers to predict CLmax and αmax associated with the
high lift flows, apart from the predictability of lift and drag of such flows in the linear region. Now there is a reasonable consensus in the community about the ability of the CFD solvers to predict these quantities and fresh efforts to further understand the ability of the CFD solvers to predict more complex physics associated with these flows have already begun.
The goal of this thesis is to assess the capability of the computational methods in predicting such complex
flow phenomena associated with the 3D
High-Lift systems. For evaluation NASA three element Trapezoidal wing configuration which poses a challenging task in numerical modeling was selected. Unstructured data based 3D RANS solver HiFUN (HiFUN stands for
High Resolution Flow Solver for UNstructured Meshes) is used in investigating the
high lift
flow. The computations were run fully turbulent, using the one equation Spalart-Allmaras turbulence model.
A summary of the results obtained using the
flow solver HiFUN for the 3D
High lift NASA Trapezoidal wing are presented. Hybrid unstructured grids have been used for the computations. Grid converged solution obtained for the clean wing and the wing with support brackets, are compared with experimental data. The ability of the solver to predict critical design parameters associated with the
high lift
flow, such as αmax and CLmax is demonstrated. The utility of the CFD tools, in predicting change in aerodynamic parameters in response to perturbational changes in the configuration is brought out. The solutions obtained for the
high lift configuration from two variants of the Spalart-Allmaras turbulence model are compared. To check the unsteadiness in the
flow, particularly near stall, unsteady simulations were performed on static grid. Lastly, hysteresis on lower leg of lift curve is discussed, the results obtained for quasi-steady and dynamic unsteady simulations are presented. Inferences from the study on useful design practices pertaining to the 3D
high lift
flow simulations are summarized.
Advisors/Committee Members: Balakrishnan, N (advisor).
Subjects/Keywords: High Lift Flow; Trap Wing; Aerodynamic Design; Fluid Mechanics; Computational Fluid Dynamics (CFD); High Resolution Flow Solver for UNstructured Meshes; Grid Generation; Turbulence; Trapezoidal Wing; 3D High Lift Flow; High Lift Flow Computations; HiFUN; HiFUN Solver; Aerospace Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gopalakrishna, N. (2018). On Three Dimensional High Lift Flow Computations. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3127
Chicago Manual of Style (16th Edition):
Gopalakrishna, N. “On Three Dimensional High Lift Flow Computations.” 2018. Masters Thesis, Indian Institute of Science. Accessed March 05, 2021.
http://etd.iisc.ac.in/handle/2005/3127.
MLA Handbook (7th Edition):
Gopalakrishna, N. “On Three Dimensional High Lift Flow Computations.” 2018. Web. 05 Mar 2021.
Vancouver:
Gopalakrishna N. On Three Dimensional High Lift Flow Computations. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Mar 05].
Available from: http://etd.iisc.ac.in/handle/2005/3127.
Council of Science Editors:
Gopalakrishna N. On Three Dimensional High Lift Flow Computations. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3127
University of Oregon
13.
Sane, Sudhanshu.
Establishing the Viability and Efficacy of In Situ Reduction Via Lagrangian Representations for Time-Dependent Vector Fields.
Degree: PhD, Department of Computer and Information Science, 2020, University of Oregon
URL: https://scholarsbank.uoregon.edu/xmlui/handle/1794/25655
► Exploratory visualization and analysis of time-dependent vector fields or flow fields generated by scientific simulations is increasingly challenging on modern supercomputers. One possible solution is…
(more)
▼ Exploratory visualization and analysis of time-dependent vector fields or
flow fields generated by scientific simulations is increasingly challenging on modern supercomputers. One possible solution is the use of a Lagrangian-based in situ reduction and post hoc exploration approach. Although this approach offers improved accuracy-storage propositions, prior work has failed to evaluate the viability and efficacy of this method at scale. Additionally, there is a lack of understanding surrounding best practices that advance the effectiveness of
the Lagrangian-based approach. This dissertation contributes empirical studies measuring absolute error, calculating the practical in situ encumbrance, and understanding tradeoffs involving accuracy, storage, and performance. Further, this dissertation proposes algorithms that 1) improve accuracy-storage propositions via improved in situ seed placement and post hoc interpolation, and 2) achieve scalability via a communication-free model. Overall, the research presented in this dissertation establishes the viability and efficacy of using Lagrangian representations extracted in situ for post hoc exploratory visualization of large time-dependent vector fields.
Advisors/Committee Members: Childs, Hank (advisor).
Subjects/Keywords: Data Reduction; Flow Visualization; High Performance Computing; In Situ Processing; Scientific Visualization; Vector Field
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sane, S. (2020). Establishing the Viability and Efficacy of In Situ Reduction Via Lagrangian Representations for Time-Dependent Vector Fields. (Doctoral Dissertation). University of Oregon. Retrieved from https://scholarsbank.uoregon.edu/xmlui/handle/1794/25655
Chicago Manual of Style (16th Edition):
Sane, Sudhanshu. “Establishing the Viability and Efficacy of In Situ Reduction Via Lagrangian Representations for Time-Dependent Vector Fields.” 2020. Doctoral Dissertation, University of Oregon. Accessed March 05, 2021.
https://scholarsbank.uoregon.edu/xmlui/handle/1794/25655.
MLA Handbook (7th Edition):
Sane, Sudhanshu. “Establishing the Viability and Efficacy of In Situ Reduction Via Lagrangian Representations for Time-Dependent Vector Fields.” 2020. Web. 05 Mar 2021.
Vancouver:
Sane S. Establishing the Viability and Efficacy of In Situ Reduction Via Lagrangian Representations for Time-Dependent Vector Fields. [Internet] [Doctoral dissertation]. University of Oregon; 2020. [cited 2021 Mar 05].
Available from: https://scholarsbank.uoregon.edu/xmlui/handle/1794/25655.
Council of Science Editors:
Sane S. Establishing the Viability and Efficacy of In Situ Reduction Via Lagrangian Representations for Time-Dependent Vector Fields. [Doctoral Dissertation]. University of Oregon; 2020. Available from: https://scholarsbank.uoregon.edu/xmlui/handle/1794/25655
Indian Institute of Science
14.
Vijay Kumar, V.
Numerical Simulation of Convection Dominated Flows using High Resolution Spectral Method.
Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3282
► A high resolution spectrally accurate three-dimensional flow solver is developed in order to simulate convection dominated fluid flows. The governing incompressible Navier Stokes equations along…
(more)
▼ A
high resolution spectrally accurate three-dimensional
flow solver is developed in order to simulate convection dominated fluid flows. The governing incompressible Navier Stokes equations along with the energy equation for temperature are discretized using a second-order accurate projection method which utilizes Adams Bashforth and Backward Differentiation formula for temporal discretization of the non-linear convective and linear viscous terms, respectively. Spatial discretization is performed using a Fourier/Chebyshev spectral method. Extensive tests on three-dimensional Taylor Couette
flow are performed and it is shown that the method successfully captures the different states ranging from formation of Taylor vortices to wavy vortex regime. Next, the code is validated for convection dominated flows through a comprehensive comparison of the results for two dimensional Rayleigh Benard convection with the theoretical and experimental results from the literature. Finally, fully parallel simulations, with efficient utilization of computational resources and memory, are performed on a model three-dimensional axially homogeneous Rayleigh Benard convection problem in order to explore the
high Rayleigh number flows and to test the scaling of global properties.
Advisors/Committee Members: Shukla, R K (advisor).
Subjects/Keywords: Numerical Simulation; Convection; High Resolution Spectroscopy; Rayleigh Bernard Convection; Fluid Flow - Numerical Simulation; Spatial Discretization; Poisson Solver; Navier Stokes Solver; Fluid Flow Solver; Fluid Dynamics; Taylor Couette Flow; Fluid Mechanics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Vijay Kumar, V. (2018). Numerical Simulation of Convection Dominated Flows using High Resolution Spectral Method. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3282
Chicago Manual of Style (16th Edition):
Vijay Kumar, V. “Numerical Simulation of Convection Dominated Flows using High Resolution Spectral Method.” 2018. Masters Thesis, Indian Institute of Science. Accessed March 05, 2021.
http://etd.iisc.ac.in/handle/2005/3282.
MLA Handbook (7th Edition):
Vijay Kumar, V. “Numerical Simulation of Convection Dominated Flows using High Resolution Spectral Method.” 2018. Web. 05 Mar 2021.
Vancouver:
Vijay Kumar V. Numerical Simulation of Convection Dominated Flows using High Resolution Spectral Method. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Mar 05].
Available from: http://etd.iisc.ac.in/handle/2005/3282.
Council of Science Editors:
Vijay Kumar V. Numerical Simulation of Convection Dominated Flows using High Resolution Spectral Method. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3282
Delft University of Technology
15.
Regensburg, S.I. (author).
Cooling Crystallization in an Oscillatory Flow Baffled Crystallizer (OFBC): Influence of Fluid Dynamics on Crystal Product.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3786e0d9-9b04-412a-881b-0ea4d0eb05e7
► The Oscillatory Flow Baffled Crystallizer (OFBC) design has been proven to offer improved temperature control and near plug plow residence time distributions, while at the…
(more)
▼ The Oscillatory
Flow Baffled Crystallizer (OFBC) design has been proven to offer improved temperature control and near plug plow residence time distributions, while at the same time providing large residence times. These OFBC properties hold the promise of resulting in a narrow crystal size distribution, reduced residence time requirements and improved process control. However to obtain such results the operation of the OFBC along with the crystallization process should be optimized. One of the most important operational aspects to optimize is the local turbulence that results in setting the dispersion in the crystallizer to a minimum, without compromising on the mass and heat transfer processes. In this study the residence time distribution of a tracer resulting from various possible operating configurations (amplitude and frequency) in the OFBC is analyzed, for water flows with a net
flow Reynolds number of 140 (flowrate 100 ml/min) using dye tracing with an in situ transmission dip probe (absorption spectrophotometry). The best combinations of frequency and amplitude at which narrowest distribution (least dispersion) of the tracer concentration profile is achieved are found to be 1 Hz and 1 mm, 2 Hz and 3.5 mm and 4 Hz and 1 mm. The experimental results show that the ratio of the oscillatory Reynolds number and the net
flow Reynolds number should be between 0.7 and 5. This is a broader range than the reported 2 to 4 range in literature. The measured residence time distributions for the best oscillatory setting have been successfully fitted to a tanks-in-series model with a 3 % maximum error of the coefficient of determination. It can therefore be concluded that the number of tanks in series is an accurate characteristic parameter of the fluid dynamics. The assumption of ideal plug
flow, which is shown to not resemble the real RTD well, can therefore be avoided when developing the model for crystallization in an OFBC. The results of a parameter sensitivity study, based on the developed model, shows that the final seed CSD is weakly related to secondary nucleation for the used kinetic parameters. This can be explained as the small mass of the nucleated crystals does not have a large effect on the supersaturation. Furthermore, the final seed CSD has a dependence on all varied parameters but mostly to the initial seed loading. This is logical as double the initial seed loading will consume double or more amount of solute and therefore slow down the growth rate significantly. Secondary nucleation is very sensitive to the supersaturation profile (with the used kinetics) and so to the imposed temperature profile and the seed loading. The degree of plug
flow has very little effect on secondary nucleation because the supersaturation profile is hardly influenced upon variation. A temperature profile optimization showed that in order to minimize secondary nucleation using a five zone temperature control, both a constant zone temperature and a linear zone temperature approach could lower the secondary nucleation by a factor…
Advisors/Committee Members: Kramer, H.J.M. (mentor), Kacker, R. (mentor).
Subjects/Keywords: oscillatory flow; baffles; residence time distribution; cooling crystallization; modeling; tanks-in-series; high resolution finite volume scheme; nucleation; growth
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Regensburg, S. I. (. (2015). Cooling Crystallization in an Oscillatory Flow Baffled Crystallizer (OFBC): Influence of Fluid Dynamics on Crystal Product. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3786e0d9-9b04-412a-881b-0ea4d0eb05e7
Chicago Manual of Style (16th Edition):
Regensburg, S I (author). “Cooling Crystallization in an Oscillatory Flow Baffled Crystallizer (OFBC): Influence of Fluid Dynamics on Crystal Product.” 2015. Masters Thesis, Delft University of Technology. Accessed March 05, 2021.
http://resolver.tudelft.nl/uuid:3786e0d9-9b04-412a-881b-0ea4d0eb05e7.
MLA Handbook (7th Edition):
Regensburg, S I (author). “Cooling Crystallization in an Oscillatory Flow Baffled Crystallizer (OFBC): Influence of Fluid Dynamics on Crystal Product.” 2015. Web. 05 Mar 2021.
Vancouver:
Regensburg SI(. Cooling Crystallization in an Oscillatory Flow Baffled Crystallizer (OFBC): Influence of Fluid Dynamics on Crystal Product. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Mar 05].
Available from: http://resolver.tudelft.nl/uuid:3786e0d9-9b04-412a-881b-0ea4d0eb05e7.
Council of Science Editors:
Regensburg SI(. Cooling Crystallization in an Oscillatory Flow Baffled Crystallizer (OFBC): Influence of Fluid Dynamics on Crystal Product. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:3786e0d9-9b04-412a-881b-0ea4d0eb05e7
Penn State University
16.
Kim, Jinyong.
Modeling Micro- and Macro-Scale Two-Phase Flow in 3D Flow Channels of Proton Exchange Membrane Fuel Cells.
Degree: 2019, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/16374jxk621
► Water management is of paramount importance for improving the performances of proton exchange membrane fuel cells (PEMFCs). Fuel cell channel design plays the most significant…
(more)
▼ Water management is of paramount importance for improving the performances of proton exchange membrane fuel cells (PEMFCs). Fuel cell channel design plays the most significant role in not only water management but also species transport for electro-chemical reactions. To enhance the performance and durability of PEMFCs, uniform and
high oxygen concentration at catalyst layer should be ensured. Unlike conventional PEMFCs, new generation PEMFCs (i.e. Toyota Mirai) maximize their performance by optimizing both macroscopic
flow fields and configurations of micro-structures (i.e. baffle, blockages, obstacles). For a new generation of PEMFC technologies, macroscopic modeling of physical phenomena involved in micro-scale two-phase
flow of 3D complex
flow-fields (i.e. 3D fine-mesh
flow-fields of Toyota Mirai) are crucial for large-scale fuel cell simulation.
By making an analogy between
flow-fields of PEMFCs and porous media, which is so-called “porous media approach”, two-phase
flow models for
flow-fields of PEMFCs are developed to numerically investigate and capture various macroscopic and microscopic two-phase
flow behavior in
flow-fields of PEMFCs. First,
flow inertial effects in 3D complex
flow-fields on macroscale and microscale two-phase behavior are investigated by considering Forchheimer’s inertial effect on two-phase
flow. It is found that the Forchheimer’s effect plays a dominant role on liquid water removal and oxygen transport in 3D complex
flow-fields of PEMFCs.
Second, liquid water re-distributions caused by micro-pore structures attached to bi-polar plates of PEMFCs with 3D complex
flow-fields are explored by a macroscopic modeling approach accounting for a capillary effect. It is revealed that the micro porous structures, which is macroscopically viewed as secondary porous media, can improve liquid water management and oxygen diffusion if the permeability of secondary porous media is above a threshold.
Third, a two-phase
flow model based on “porous media approach” is suggested to capture the effect of different micro-scale two-phase
flow regime (slug, droplet/film, mist
flow) in
flow channels into a macroscopic PEMFC model. The macroscopic PEMFC model is then applied to explore the effect of two-phase
flow regime in micro-channels on cell performance. It is found that
flow mal-distribution can be alleviated as the two-phase regime changes from slug, droplet/film to mist
flow.
Advisors/Committee Members: Chao-Yang Wang, Dissertation Advisor/Co-Advisor, Chao-Yang Wang, Committee Chair/Co-Chair, Daniel Connell Haworth, Committee Member, Sukwon Choi, Committee Member, Michael John Janik, Outside Member.
Subjects/Keywords: Fuel Cell; 3D fine mesh; Flow-field; Water management; High current density; Mass transport; Two-phase flow; Modeling; PEMFC
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kim, J. (2019). Modeling Micro- and Macro-Scale Two-Phase Flow in 3D Flow Channels of Proton Exchange Membrane Fuel Cells. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16374jxk621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kim, Jinyong. “Modeling Micro- and Macro-Scale Two-Phase Flow in 3D Flow Channels of Proton Exchange Membrane Fuel Cells.” 2019. Thesis, Penn State University. Accessed March 05, 2021.
https://submit-etda.libraries.psu.edu/catalog/16374jxk621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kim, Jinyong. “Modeling Micro- and Macro-Scale Two-Phase Flow in 3D Flow Channels of Proton Exchange Membrane Fuel Cells.” 2019. Web. 05 Mar 2021.
Vancouver:
Kim J. Modeling Micro- and Macro-Scale Two-Phase Flow in 3D Flow Channels of Proton Exchange Membrane Fuel Cells. [Internet] [Thesis]. Penn State University; 2019. [cited 2021 Mar 05].
Available from: https://submit-etda.libraries.psu.edu/catalog/16374jxk621.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kim J. Modeling Micro- and Macro-Scale Two-Phase Flow in 3D Flow Channels of Proton Exchange Membrane Fuel Cells. [Thesis]. Penn State University; 2019. Available from: https://submit-etda.libraries.psu.edu/catalog/16374jxk621
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
17.
Chatterjee, Kamalika.
Determination of grain-level strain and proposing a new method of strain determination for three dimensional x-ray diffraction (3DXRD).
Degree: MS, 0133, 2014, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/50624
► A new approach for lattice strain determination is proposed for analysis of three dimensional x-ray diffraction (3DXRD) data. Our objective is to establish a correspondence…
(more)
▼ A new approach for lattice strain determination is proposed for analysis of three dimensional x-ray diffraction (3DXRD) data. Our objective is to establish a correspondence between lattice strain and change of diffraction spot position in ω (ω is the rotation angle about the loading axis for 3DXRD experiment), using far-
field configuration. The final goal is to apply the same concept to extract subgrain level strain from near-
field data (near-
field has less
resolution in 2θ. θ is the scattering angle for diffraction). The method is developed using the far-
field 3DXRD data obtained from an it{in-situ} experiment of a Ti-7Al alloy sample. The experiment is conducted at beamline- 1 ID of the Advanced Photon Source at Argonne National Laboratory. A
high-
resolution monochromator is used to get
high strain
resolution. The specimen is subjected to combined bending and uniaxial tensile loads up to yield at highest local stress points. Far-
field images are collected in two ways- (a) at each 0.5
o rotation about the loading axis from -180
o to 180
o (coarse scan),(b) at each 0.05
o rotation about the loading axis from -180
o to 0
o (fine scan). A near-
field data collection is carried out simultaneously. A study of the stress gradient developed in the Ti-7Al sample is performed using lattice strain determination algorithm taking care of the grain precession. A map of grain orientation in the cross-section of the sample is determined through use of the near-
field technique. A state of bending with superposed tension is revealed through correlation of the near-
field grain map with the far-
field strain and center of mass (COM) result. Lattice strain induced changes of ω are found for all scattering vectors of individual grains. It is plotted against the final ω positions of the scattering vectors. Such plots are generated for every individual grain indexed by it{GrainSpotter}. The theoretically determined values of change of ω (Δω
model) follow a sinusoidal pattern when plotted against the final ω positions (the effect of grain precession on lattice strain is taken care of in the theoretical calculations). The experimentally found values of change of ω (Δω
meas or Δω
log) may or may not show the similar coorespondence depending on the lattice orientation and lattice strain. The magnitude of the Δω
model is found to be lower than the magnitude of the Δω
meas or Δω
log. The fine scan proves to be more informative than the coarse scan for study of shift of ω position of a diffraction spot with change of load.
Advisors/Committee Members: Beaudoin, Armand J. (advisor).
Subjects/Keywords: x-ray diffraction; far-field; near-field; high resolution monochromator; lattice strain; center of mass; grain map; diffraction spot position; bending trend
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chatterjee, K. (2014). Determination of grain-level strain and proposing a new method of strain determination for three dimensional x-ray diffraction (3DXRD). (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/50624
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chatterjee, Kamalika. “Determination of grain-level strain and proposing a new method of strain determination for three dimensional x-ray diffraction (3DXRD).” 2014. Thesis, University of Illinois – Urbana-Champaign. Accessed March 05, 2021.
http://hdl.handle.net/2142/50624.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chatterjee, Kamalika. “Determination of grain-level strain and proposing a new method of strain determination for three dimensional x-ray diffraction (3DXRD).” 2014. Web. 05 Mar 2021.
Vancouver:
Chatterjee K. Determination of grain-level strain and proposing a new method of strain determination for three dimensional x-ray diffraction (3DXRD). [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2142/50624.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chatterjee K. Determination of grain-level strain and proposing a new method of strain determination for three dimensional x-ray diffraction (3DXRD). [Thesis]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/50624
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
The Ohio State University
18.
Burgess, Richard Ely.
Magnetic resonance imaging at ultra high field: implications
for human neuroimaging.
Degree: PhD, Biomedical Engineering, 2004, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1089949841
► Even before the development of magnetic resonance imaging, scientists and engineers repeatedly predicted that, despite the theoretical potential of high field, physical and engineering challenges…
(more)
▼ Even before the development of magnetic resonance
imaging, scientists and engineers repeatedly predicted that,
despite the theoretical potential of
high field, physical and
engineering challenges would prevent the practical realization of
gains in signal to noise. Many of the arguments used to disparage
high field MRI can be divided into issues of uniform excitation,
image distortion, and patient safety. In the former category lies
challenges such as RF penetration limitations, dielectric
resonances, coil self-resonance, coil-sample interactions, and RF
power requirements, which may prevent uniform B1 can best be
studied with numerical modeling techniques. Within the second
category are effects such as chemical shift artifact,
susceptibility distortions, and contrast convergence that can be
well studied through analytic techniques and methodical
manipulation of imaging parameters. In the category of safety
belong RF power deposition and magnetohydrodynamic effects. In this
thesis, issues of static
field safety will be exhaustively explored
and investigation of image contrast and quality will be undertaken
to assess the potential of the 8 Tesla system for human
neuroimaging. This thesis will specifically examine the theoretical
risk of cardiac arrhythmia from induced currents and demonstrate
the negligible cardiac, cognitive, and physiological bioeffects
through animal and human studies. The extent of signal to noise
ratio enhancement possible at 8 Tesla will be assessed and
harnessed to obtain
high resolution whole brain images. In the end,
experimental results and analysis show that, despite the presence
of artifact,
high resolution images of the human brain with unique
contrast can be safely obtained at 8 Tesla.
Advisors/Committee Members: Robitaille, Pierre-Marie (Advisor).
Subjects/Keywords: magnetic resonance; magnetic resonance imaging; MRI; high field; 8 tesla; high resolution
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Burgess, R. E. (2004). Magnetic resonance imaging at ultra high field: implications
for human neuroimaging. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1089949841
Chicago Manual of Style (16th Edition):
Burgess, Richard Ely. “Magnetic resonance imaging at ultra high field: implications
for human neuroimaging.” 2004. Doctoral Dissertation, The Ohio State University. Accessed March 05, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1089949841.
MLA Handbook (7th Edition):
Burgess, Richard Ely. “Magnetic resonance imaging at ultra high field: implications
for human neuroimaging.” 2004. Web. 05 Mar 2021.
Vancouver:
Burgess RE. Magnetic resonance imaging at ultra high field: implications
for human neuroimaging. [Internet] [Doctoral dissertation]. The Ohio State University; 2004. [cited 2021 Mar 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1089949841.
Council of Science Editors:
Burgess RE. Magnetic resonance imaging at ultra high field: implications
for human neuroimaging. [Doctoral Dissertation]. The Ohio State University; 2004. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1089949841
Texas A&M University
19.
Ruchala, Tyler Louis.
Seafloor Processes at Kick ‘Em Jenny Volcano, Pre- July 2015 Volcanic Event, using High-Resolution Shipboard and Remotely Operated Vehicle Near-Source Data.
Degree: MS, Geophysics, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/161517
► To understand the physical and geological processes that drive the volcanism and control the morphology of KEJ volcano, the only active submarine volcano in the…
(more)
▼ To understand the physical and geological processes that drive the volcanism and control the morphology of KEJ volcano, the only active submarine volcano in the Lesser Antilles volcanic arc, I conducted near-source,
high-
resolution bathymetry and magnetic mapping of KEJ volcano and its subsurface using the ROV Hercules during cruise NA054 of the E/V Nautilus (Sept.-Oct. 2014). In our results, multiple generations of submarine landslides and well-developed canyons are observed, suggesting that the area has been hosting dynamic sediment transport systems from the flank of the volcano to the seafloor at multiple scales over time, with some of them being attributed to past eruptions. The canyons likely formed from in situ gravity flows due to the lack of evidence for subsidence in the area of KEJ. Columnar basalts located in the middle of the landslide deposit are similar in appearance to those observed in the KEJ crater during previous ROV dives, indicating a possible extent of a landslide event, i.e. a travel distance of volcanic materials from the crater region along landslide path. Landslide triggers at KEJ are still debated, but sector collapse of the edifice has been numerically predicted to be the failure style.
High-
resolution near-bottom magnetic anomaly data is used to investigate ongoing volcanism at KEJ, and revealed a magnetic anomaly
high within the inner crater of KEJ. The source of the dichotomy in magnetization is both a dike complex at the inner crater and a fault trending NNE-SSW. I propose the following cyclic evolution scenario of KEJ from eruption events to inter-eruption periods, by combining seafloor morphology observations, integrating
high-
resolution bathymetry maps, ROV visuals and rock samples from the wholesale KEJ, and subsurface characterization with
high-
resolution near-bottom magnetic survey of KEJ crater and inner crater. KEJ formed from arc volcanism; the magma rises quickly though the magma conduits to the shallow subsurface with a series of dikes; it erupted in shallow water depth; it erupted in an explosive style; these volcanic eruptions trigger a landslide and deposit material downslope; submarine canyons form from in situ submarine gravity flows until next the eruption.
Advisors/Committee Members: Tominaga, Masako (advisor), Miller, Brent (committee member), Sylvan, Jason Brent (committee member).
Subjects/Keywords: Submarine Volcanism; high-resolution magnetics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ruchala, T. L. (2017). Seafloor Processes at Kick ‘Em Jenny Volcano, Pre- July 2015 Volcanic Event, using High-Resolution Shipboard and Remotely Operated Vehicle Near-Source Data. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161517
Chicago Manual of Style (16th Edition):
Ruchala, Tyler Louis. “Seafloor Processes at Kick ‘Em Jenny Volcano, Pre- July 2015 Volcanic Event, using High-Resolution Shipboard and Remotely Operated Vehicle Near-Source Data.” 2017. Masters Thesis, Texas A&M University. Accessed March 05, 2021.
http://hdl.handle.net/1969.1/161517.
MLA Handbook (7th Edition):
Ruchala, Tyler Louis. “Seafloor Processes at Kick ‘Em Jenny Volcano, Pre- July 2015 Volcanic Event, using High-Resolution Shipboard and Remotely Operated Vehicle Near-Source Data.” 2017. Web. 05 Mar 2021.
Vancouver:
Ruchala TL. Seafloor Processes at Kick ‘Em Jenny Volcano, Pre- July 2015 Volcanic Event, using High-Resolution Shipboard and Remotely Operated Vehicle Near-Source Data. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1969.1/161517.
Council of Science Editors:
Ruchala TL. Seafloor Processes at Kick ‘Em Jenny Volcano, Pre- July 2015 Volcanic Event, using High-Resolution Shipboard and Remotely Operated Vehicle Near-Source Data. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161517
Louisiana State University
20.
Steiner, Joseph Robert.
Endorectal Digital Prostate Tomosynthesis.
Degree: PhD, Health and Medical Physics, 2018, Louisiana State University
URL: https://digitalcommons.lsu.edu/gradschool_dissertations/4582
► Several areas of prostate cancer (PCa) management, such as imaging permanent brachytherapy implants or small, aggressive lesions, benefit from high image resolution. Current PCa…
(more)
▼ Several areas of prostate cancer (PCa) management, such as imaging permanent brachytherapy implants or small, aggressive lesions, benefit from high image resolution. Current PCa imaging methods can have inadequate resolution for imaging these areas. Endorectal digital prostate tomosynthesis (endoDPT), an imaging method that combines an external x-ray source and an endorectal x-ray sensor, can produce three-dimensional images of the prostate region that have high image resolution compared to typical methods. This high resolution may improve PCa management and increase positive outcomes in affected men.
This dissertation presents the initial development of endoDPT, including system design, image quality assessment, and examples of possible applications to prostate imaging. Experiments using computational phantoms, physical phantoms, and canine prostate specimens were conducted.
Initial system design was performed computationally and three methods of endoDPT image reconstruction were developed: shift and add (SAA), backprojection (BP), and filtered BP (FBP). A physical system was developed using an XDR intraoral x-ray sensor and a GE radiography unit. The resolution and radiation dose of endoDPT were measured and compared to a GE CT scanner. Canine prostate specimens that approximated clinical cases of PCa management were imaged and compared using endoDPT, the above CT scanner, and a GE MRI scanner.
This study found that the resolution of endoDPT was significantly higher than CT. The radiation dose of endoDPT was significantly lower than CT in the regions of the phantom that were not in the endoDPT field of view (FoV). Inside the endoDPT FoV, the radiation dose ranged from significantly less than to significantly greater than CT. The endoDPT images of the canine prostate specimens demonstrated qualitative improvements in resolution compared to CT and MRI, but endoDPT had difficulty in visualizing larger structures, such as the prostate border.
Overall, this study has demonstrated endoDPT has high image resolution compared to typical methods of PCa imaging. Future work will be focused on development of a prototype system that improves scanning efficiency that can be used to optimize endoDPT and perform pre-clinical studies.
Subjects/Keywords: prostate cancer; high-resolution imaging
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Steiner, J. R. (2018). Endorectal Digital Prostate Tomosynthesis. (Doctoral Dissertation). Louisiana State University. Retrieved from https://digitalcommons.lsu.edu/gradschool_dissertations/4582
Chicago Manual of Style (16th Edition):
Steiner, Joseph Robert. “Endorectal Digital Prostate Tomosynthesis.” 2018. Doctoral Dissertation, Louisiana State University. Accessed March 05, 2021.
https://digitalcommons.lsu.edu/gradschool_dissertations/4582.
MLA Handbook (7th Edition):
Steiner, Joseph Robert. “Endorectal Digital Prostate Tomosynthesis.” 2018. Web. 05 Mar 2021.
Vancouver:
Steiner JR. Endorectal Digital Prostate Tomosynthesis. [Internet] [Doctoral dissertation]. Louisiana State University; 2018. [cited 2021 Mar 05].
Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4582.
Council of Science Editors:
Steiner JR. Endorectal Digital Prostate Tomosynthesis. [Doctoral Dissertation]. Louisiana State University; 2018. Available from: https://digitalcommons.lsu.edu/gradschool_dissertations/4582
Indian Institute of Science
21.
Regmi, Raju.
Light Sheet Based Microfluidic Flow Cytometry Techniques for High throughput Interrogation and High-resolution Imaging.
Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3108
► Light allows to non-invasively study the complex and dynamic biological phenomenon undergoing within cells and tissues in their native state. The development of super-resolution microscopes…
(more)
▼ Light allows to non-invasively study the complex and dynamic biological phenomenon undergoing within cells and tissues in their native state. The development of super-
resolution microscopes in recent years has helped to overcome the fundamental limitation imposed by Abbe’s diffraction limit, thereby revolutionizing the field of molecular and cellular biology. With the advancement of various super-
resolution techniques (like STED, PALM, and 4Pi) it is now possible to visualize the nanometeric cellular structures and their dynamics in real time. The limitations of existing fluorescence microscopy techniques are: poor axial
resolution when compared to their lateral counterpart, and their inability to produce
high resolution images of dynamic samples. This thesis covers two broadly connected areas of fluorescence imaging techniques while addressing these limitations. First, the PSF engineering and spatial filtering technique for axial super-
resolution microscopy and second, the integration of light sheet illumination PSF with microfluidic cytometry for imaging cells on-the-go.
The first chapter gives an explicit description on the fundamentals of fluorescence imaging. This introductory chapter includes a variety of optical microscopes, PSF engineering, the
resolution limit imposed by the wave nature of light, the photochemistry of the fluorescent dyes, and their proper selection for fluorescence experiments. In addition to the state-of-art imaging techniques, namely Laser Scanning Confocal Microscopy and Light Sheet Microscopy, this chapter also gives a brief explanation on the evolution of imaging cytometry techniques. Their
high speed analytic capability (i.e sorting and counting) makes this technique an important tool in health care diagnosis and other various biomedical applications. The chapter ends with a discussion on the operating principle of the flow cytometers and their limitations.
The second chapter in this thesis describes the spatial filtering technique for engineering the PSF to eliminate the side-lobes in the system PSF of the 4Pi Confocal Microscopes. Employing an amplitude mask with binary light transmission windows (also called binary filters), the incident light is structured to minimize the secondary lobes. These lobes are responsible for exciting the off-focal planes in the specimen, hence provide incorrect map of the fluorophore distribution in the object. The elimination of the side-lobes is essential for the artifact-free axial super-
resolution microscopy. This second chapter describes the spatial filtering technique in details (its mathematical formulation, application in fluorescence microscopy for generation of desired PSF including Bessellike beam). Specifically, spatial filtering technique is employed in 4Pi type-C Confocal Microscope. The spatial mask used results in the reduction of the side-lobes in 1PE case while they are nearly eliminated in 2PE variant of the proposed technique. The side-lobes are reduced by 46% and 76% for 1PE and 2PE when compared to the existing 4Pi type-C Confocal Microscope…
Advisors/Committee Members: Mondal, Partha Pratim (advisor).
Subjects/Keywords: Cytometry Techniques; Fluorescence Phenomenon; Optical Microscopy; Fluorescence Imaging Techniques; Microfluidic Flow Cytometry; Imaging Flow Cytometry; Imaging Cytometry System; Spatial Filtering; High Resolution Imaging; Point Spread Function (PSF); Instrumentation
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Regmi, R. (2018). Light Sheet Based Microfluidic Flow Cytometry Techniques for High throughput Interrogation and High-resolution Imaging. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3108
Chicago Manual of Style (16th Edition):
Regmi, Raju. “Light Sheet Based Microfluidic Flow Cytometry Techniques for High throughput Interrogation and High-resolution Imaging.” 2018. Masters Thesis, Indian Institute of Science. Accessed March 05, 2021.
http://etd.iisc.ac.in/handle/2005/3108.
MLA Handbook (7th Edition):
Regmi, Raju. “Light Sheet Based Microfluidic Flow Cytometry Techniques for High throughput Interrogation and High-resolution Imaging.” 2018. Web. 05 Mar 2021.
Vancouver:
Regmi R. Light Sheet Based Microfluidic Flow Cytometry Techniques for High throughput Interrogation and High-resolution Imaging. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Mar 05].
Available from: http://etd.iisc.ac.in/handle/2005/3108.
Council of Science Editors:
Regmi R. Light Sheet Based Microfluidic Flow Cytometry Techniques for High throughput Interrogation and High-resolution Imaging. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3108
Indian Institute of Science
22.
Avinash Ramakanth, S.
Approximate Nearest Neighbour Field Computation and Applications.
Degree: MSc Engg, Faculty of Engineering, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3503
► Approximate Nearest-Neighbour Field (ANNF maps between two related images are commonly used by computer vision and graphics community for image editing, completion, retargetting and denoising.…
(more)
▼ Approximate Nearest-Neighbour
Field (ANNF maps between two related images are commonly used by computer vision and graphics community for image editing, completion, retargetting and denoising. In this work we generalize ANNF computation to unrelated image pairs. For accurate ANNF map computation we propose Feature Match, in which the low-dimensional features approximate image patches along with global colour adaptation. Unlike existing approaches, the proposed algorithm does not assume any relation between image pairs and thus generalises ANNF maps to any unrelated image pairs. This generalization enables ANNF approach to handle a wider range of vision applications more efficiently. The following is a brief description of the applications developed using the proposed Feature Match framework.
The first application addresses the problem of detecting the optic disk from retinal images. The combination of ANNF maps and salient properties of optic disks leads to an efficient optic disk detector that does not require tedious training or parameter tuning. The proposed approach is evaluated on many publicly available datasets and an average detection accuracy of 99% is achieved with computation time of 0.2s per image. The second application aims to super-resolve a given synthetic image using a single source image as dictionary, avoiding the expensive training involved in conventional approaches. In the third application, we make use of ANNF maps to accurately propagate labels across video for segmenting video objects. The proposed approach outperforms the state-of-the-art on the widely used benchmark SegTrack dataset. In the fourth application, ANNF maps obtained between two consecutive frames of video are enhanced for estimating sub-pixel accurate optical
flow, a critical step in many vision applications. Finally a summary of the framework for various possible applications like image encryption, scene segmentation etc. is provided.
Advisors/Committee Members: Venkatesh Babu, R (advisor).
Subjects/Keywords: Digital Image Processing; Computer Vision; Optic Disc Detection; Video Object Segmentation; Approximate Nearest Neighbour Field (ANNF); Optical Flow; PatchMatch; Super Resolution Imaging; Feature Match; Computer Science
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Avinash Ramakanth, S. (2018). Approximate Nearest Neighbour Field Computation and Applications. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3503
Chicago Manual of Style (16th Edition):
Avinash Ramakanth, S. “Approximate Nearest Neighbour Field Computation and Applications.” 2018. Masters Thesis, Indian Institute of Science. Accessed March 05, 2021.
http://etd.iisc.ac.in/handle/2005/3503.
MLA Handbook (7th Edition):
Avinash Ramakanth, S. “Approximate Nearest Neighbour Field Computation and Applications.” 2018. Web. 05 Mar 2021.
Vancouver:
Avinash Ramakanth S. Approximate Nearest Neighbour Field Computation and Applications. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Mar 05].
Available from: http://etd.iisc.ac.in/handle/2005/3503.
Council of Science Editors:
Avinash Ramakanth S. Approximate Nearest Neighbour Field Computation and Applications. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3503
Kyoto University / 京都大学
23.
Zhao, Ming.
Studies on High-k Gate Stacks by High-resolution Rutherford Backscattering Spectroscopy : 高分解能ラザフォード後方散乱法による高誘電率ゲートスタック構造に関する研究.
Degree: 博士(工学), 2008, Kyoto University / 京都大学
URL: http://hdl.handle.net/2433/57263
;
http://dx.doi.org/10.14989/doctor.k13814
► This thesis is on the study of the characterization of interfaces and surfaces of high-k stacks for the future microelectronics. The changes of the high-k…
(more)
▼ This thesis is on the study of the characterization of interfaces and surfaces of high-k stacks for the future microelectronics. The changes of the high-k stacks during thermal processing and its mechanism have been experimentally investigated by high-resolution Rutherford Backscattering Spectrometry (HRBS) in combination with isotope tracing. The experimental results are consistent with the theoretical prediction that the silicon will be emitted outward to release the stress which is induced by the interface Si oxidation. Then, we studied the potential method, oxygen-gettering by Ti overlayer, for controlling the interface SiO2 thickness. Furthermore, we proposed a Time-Of-Flight (TOF) detector system for application on crystallographic analysis. TOF-RBS system is capable to analyze the sample’s crystallographic and chemical information even at the near surface of the sample, which is strongly required by the future microelectronics industry. In this chapter, brief introduction to the high-k stacks and the outline of this thesis are described.
新制・課程博士
甲第13814号
工博第2918号
Subjects/Keywords: high-k gate stacks; high-resolution RBS
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhao, M. (2008). Studies on High-k Gate Stacks by High-resolution Rutherford Backscattering Spectroscopy : 高分解能ラザフォード後方散乱法による高誘電率ゲートスタック構造に関する研究. (Thesis). Kyoto University / 京都大学. Retrieved from http://hdl.handle.net/2433/57263 ; http://dx.doi.org/10.14989/doctor.k13814
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhao, Ming. “Studies on High-k Gate Stacks by High-resolution Rutherford Backscattering Spectroscopy : 高分解能ラザフォード後方散乱法による高誘電率ゲートスタック構造に関する研究.” 2008. Thesis, Kyoto University / 京都大学. Accessed March 05, 2021.
http://hdl.handle.net/2433/57263 ; http://dx.doi.org/10.14989/doctor.k13814.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhao, Ming. “Studies on High-k Gate Stacks by High-resolution Rutherford Backscattering Spectroscopy : 高分解能ラザフォード後方散乱法による高誘電率ゲートスタック構造に関する研究.” 2008. Web. 05 Mar 2021.
Vancouver:
Zhao M. Studies on High-k Gate Stacks by High-resolution Rutherford Backscattering Spectroscopy : 高分解能ラザフォード後方散乱法による高誘電率ゲートスタック構造に関する研究. [Internet] [Thesis]. Kyoto University / 京都大学; 2008. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2433/57263 ; http://dx.doi.org/10.14989/doctor.k13814.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhao M. Studies on High-k Gate Stacks by High-resolution Rutherford Backscattering Spectroscopy : 高分解能ラザフォード後方散乱法による高誘電率ゲートスタック構造に関する研究. [Thesis]. Kyoto University / 京都大学; 2008. Available from: http://hdl.handle.net/2433/57263 ; http://dx.doi.org/10.14989/doctor.k13814
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
24.
Zheng, Lijuan.
Computational Exploration of High Power Operation in Porous Flow Field Polymer Electrolyte Fuel Cells with a Validated Model.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/17408
► As one of the most promising hydrogen-based energy conversion devices, the polymer electrolyte fuel cell (PEFC) has been through intense development in the last two…
(more)
▼ As one of the most promising hydrogen-based energy conversion devices, the polymer electrolyte fuel cell (PEFC) has been through intense development in the last two decades. Ultra-
high current operation, which cannot be normally achieved at a reasonable voltage by the commonly used cell architecture, has been enabled by material advancement and cell design lately. However, a robust model is needed to rise to the unprecedented challenges in heat and water management. A comprehensive 2D + 1 computational model has been developed in this work to explore the operation of a PEFC with open metallic element (OME) porous
flow field in the ultra-
high current regime.
In most of previous modeling works, the model validation has been generally limited to polarization curve comparison under single selected condition. This model distinguishes itself from the others in that it has been validated to a greater extent, including in-situ experimental measurement of performance, area specific resistance (ASR), and net water drag (NWD) coefficient. Data furnished by experimental diagnostics under a wide range of operating parameters serve as benchmark for model validation. Results also highlight the utility of experimentally-determined anode dry-out limits for validating multi-phase models.
The collaborative experimental and modeling investigation shows that gas phase oxygen transport, which is responsible for limiting current density observed with conventional parallel
flow field, is not the limiting factor in OME porous
flow field, even in the ultra-
high current regime. Notwithstanding the significant performance improvement of OME porous
flow field at
high current, anode dry-out limits the performance, as confirmed by NWD data from both experiment and model. Moreover, diffusive transport has been determined to be the dominant mode of water removal from the catalyst layer in an OME porous
flow field, compared to capillary action and convective flux.
Thermo-osmosis, which is a regularly-observed mode of water transport across membrane in experiments but relatively minor due to low performance and low temperature gradient achieved in conventional parallel
flow field, demonstrates its non-negligible effect in comparison to electro-osmosis, especially under hot and dry
high power density conditions, even with thin polymer electrolyte membranes.
The extensively-validated model is then applied to engineer cell operation so that anode dry-out can be mitigated in
high temperature
high power density operating regime, desired for automotive application. Predictions of internal water distribution demonstrate that moderate changes in operating parameters, such as pressure, stoichiometry and humidity, help maintain a hydrated anode stream and therefore enable a 20 ⁰C increase in stable operating temperature than the baseline case, making heat dissipation to the cooling system more efficient.
Advisors/Committee Members: Matthew M Mench, Dissertation Advisor/Co-Advisor, Adrianus C Van Duin, Committee Chair/Co-Chair, Jack Brenizer Jr., Committee Member, John Michael Regan, Committee Member.
Subjects/Keywords: polymer electrolyte fuel cell; porous flow field; multi-phase model; high power density operation; anode dry-out; net water drag
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zheng, L. (2013). Computational Exploration of High Power Operation in Porous Flow Field Polymer Electrolyte Fuel Cells with a Validated Model. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/17408
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zheng, Lijuan. “Computational Exploration of High Power Operation in Porous Flow Field Polymer Electrolyte Fuel Cells with a Validated Model.” 2013. Thesis, Penn State University. Accessed March 05, 2021.
https://submit-etda.libraries.psu.edu/catalog/17408.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zheng, Lijuan. “Computational Exploration of High Power Operation in Porous Flow Field Polymer Electrolyte Fuel Cells with a Validated Model.” 2013. Web. 05 Mar 2021.
Vancouver:
Zheng L. Computational Exploration of High Power Operation in Porous Flow Field Polymer Electrolyte Fuel Cells with a Validated Model. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Mar 05].
Available from: https://submit-etda.libraries.psu.edu/catalog/17408.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zheng L. Computational Exploration of High Power Operation in Porous Flow Field Polymer Electrolyte Fuel Cells with a Validated Model. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/17408
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
25.
Lin, Cheng-wei.
A fully mass and volume conserving implementation of linear advective-diffusive-reactive transport problems.
Degree: Master, Applied Mathematics, 2008, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724108-193815
► The goal of this method is to implement the volume and mass conserving characteristic method. This method is appropriate to the equation with advections and…
(more)
▼ The goal of this method is to implement the volume and mass
conserving characteristic method. This method is appropriate to the
equation with advections and diffusions. Characteristic mixed FEM
with piecewise constant approximation is applied to the advection
part, and the diffusion part is handled by FDM.
Advisors/Committee Members: Jhishen Tsay (chair), Chieh-Sen Huang (committee member), Tzon-Tzer Lu (chair), Zi-Cai Li (chair).
Subjects/Keywords: advective; mass; diffusive; volume; conserving
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lin, C. (2008). A fully mass and volume conserving implementation of linear advective-diffusive-reactive transport problems. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724108-193815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lin, Cheng-wei. “A fully mass and volume conserving implementation of linear advective-diffusive-reactive transport problems.” 2008. Thesis, NSYSU. Accessed March 05, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724108-193815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lin, Cheng-wei. “A fully mass and volume conserving implementation of linear advective-diffusive-reactive transport problems.” 2008. Web. 05 Mar 2021.
Vancouver:
Lin C. A fully mass and volume conserving implementation of linear advective-diffusive-reactive transport problems. [Internet] [Thesis]. NSYSU; 2008. [cited 2021 Mar 05].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724108-193815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lin C. A fully mass and volume conserving implementation of linear advective-diffusive-reactive transport problems. [Thesis]. NSYSU; 2008. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0724108-193815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Newcastle
26.
Qin, Juan.
A high-resolution hierarchical model for space-time rainfall.
Degree: PhD, 2011, University of Newcastle
URL: http://hdl.handle.net/1959.13/808076
► Research Doctorate - Doctor of Philosophy (PhD)
The hydrologic response of urban catchments is sensitive to small scale space-time rainfall variations. A stochastic space-time rainfall…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
The hydrologic response of urban catchments is sensitive to small scale space-time rainfall variations. A stochastic space-time rainfall model used for design purposes must reproduce important statistics at these small scales. However, current rainfall models make simplifying assumptions about the temporal characteristics of rainfields and thus cannot be expected to reproduce important statistics over various space and time scales. In this study, an extensive investigation of radar rainfall data for the Sydney region motivated the development of a new phenomenological hierarchical stochastic model to robustly simulate rainfall fields consistent with 10-minute 1-km2 pixel radar images. The hierarchical framework consists of three levels. The development of the first two levels which simulate the evolution of rainfall fields for a single storm is the focus of this thesis. The third level, which is designed for simulation of storm sequences, is left for future research. The first level simulates a latent Gaussian random field conditioned on the previous time step, , which is transformed to a rain field using a power transformation. A Toeplitz block circulant technique is used to achieve fast and accurate simulations of large Gaussian random fields (with lattice of 256 by 256), and is shown to be hugely more efficient than the traditional Cholesky decomposition method. In the second level, first-order autoregressive (AR(1)) models are used to describe the within-storm variations of the level-one parameters that control the evolution of the rain fields. Calibration is performed using a generalized method-of-moments approach. The parametric bootstrap validation technique was used to evaluate the performance of the first two levels of the model by comparing the characteristics of interest for four observed storm events (typical of frontal and convective storms experienced in Sydney, Australia) and synthetic storms. It is found that this two-level rainfall model produces realistic sequences of rain images which capture the physical hierarchical structure of clusters, patchiness of rain fields and the persistence exhibited during storm development. A variety of important statistics were adequately reproduced at both 10-min and 1-hr time scales over space scales ranging from 1 km up to 32 km. Finally, application of this model to short-term rainfall forecasting is presented.
Advisors/Committee Members: University of Newcastle. Faculty of Engineering and Built Environment, School of Engineering.
Subjects/Keywords: stochastic space-time rainfall; high-resolution; hierarchical framework; conditional simulation; latent Gaussian random field; Toeplitz block circulant technique; generalized method-of-moments approach; parametric bootstrap; short-term forecasting
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Qin, J. (2011). A high-resolution hierarchical model for space-time rainfall. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/808076
Chicago Manual of Style (16th Edition):
Qin, Juan. “A high-resolution hierarchical model for space-time rainfall.” 2011. Doctoral Dissertation, University of Newcastle. Accessed March 05, 2021.
http://hdl.handle.net/1959.13/808076.
MLA Handbook (7th Edition):
Qin, Juan. “A high-resolution hierarchical model for space-time rainfall.” 2011. Web. 05 Mar 2021.
Vancouver:
Qin J. A high-resolution hierarchical model for space-time rainfall. [Internet] [Doctoral dissertation]. University of Newcastle; 2011. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1959.13/808076.
Council of Science Editors:
Qin J. A high-resolution hierarchical model for space-time rainfall. [Doctoral Dissertation]. University of Newcastle; 2011. Available from: http://hdl.handle.net/1959.13/808076
New Jersey Institute of Technology
27.
Mitrofanov, Oleg.
Near-field imaging with terahertz pulses.
Degree: PhD, Federated Physics Department, 2001, New Jersey Institute of Technology
URL: https://digitalcommons.njit.edu/dissertations/478
► High spatial resolution imaging is implemented with a novel collection mode near-field terahertz (THz) probe. Exceptional sensitivity of the probe allows imaging with spatial…
(more)
▼ High spatial
resolution imaging is implemented with a novel collection mode near-
field terahertz (THz) probe. Exceptional sensitivity of the probe allows imaging with spatial
resolution of few microns using THz pulses with spectral content of 120 to 1500 microns. In the present study, the principle of the probe operation as well as the probe design and characteristics are described.
The probe performance is related to effective detection of radiation coupled into the probe aperture. Propagation of short single-cycle electromagnetic pulses through apertures as small as 1/300 of the wavelength is experimentally and numerically studied. Finite-difference time-domain method is used to model propagation of THz pulses through the probe aperture in order to optimize the probe design. It is shown that the probe sensitivity is significantly improved if the detecting antenna measures electric
field coupled through the aperture in the near-
field zone rather than in the far-
field zone. Effects of temporal and spectral pulse shaping are described by frequency-dependent transmission at the near- or below cutoff regimes of the aperture. Imaging schemes, properties, and artifacts are considered. The technique provides the best to date spatial
resolution capabilities in the THz range of the electromagnetic spectrum.
Advisors/Committee Members: John Francis Federici, Anthony M. Johnson, Mark R. Lee.
Subjects/Keywords: High Spatial Resolution Imaging; Near-Field Terahertz (THz) Probe; Probe Design; Other Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mitrofanov, O. (2001). Near-field imaging with terahertz pulses. (Doctoral Dissertation). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/dissertations/478
Chicago Manual of Style (16th Edition):
Mitrofanov, Oleg. “Near-field imaging with terahertz pulses.” 2001. Doctoral Dissertation, New Jersey Institute of Technology. Accessed March 05, 2021.
https://digitalcommons.njit.edu/dissertations/478.
MLA Handbook (7th Edition):
Mitrofanov, Oleg. “Near-field imaging with terahertz pulses.” 2001. Web. 05 Mar 2021.
Vancouver:
Mitrofanov O. Near-field imaging with terahertz pulses. [Internet] [Doctoral dissertation]. New Jersey Institute of Technology; 2001. [cited 2021 Mar 05].
Available from: https://digitalcommons.njit.edu/dissertations/478.
Council of Science Editors:
Mitrofanov O. Near-field imaging with terahertz pulses. [Doctoral Dissertation]. New Jersey Institute of Technology; 2001. Available from: https://digitalcommons.njit.edu/dissertations/478
Virginia Tech
28.
Seaman, Shane Thomas.
Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter.
Degree: PhD, Materials Science and Engineering, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/90799
► LiDAR (an acronym for Light Detection and Ranging) is a technology that can be used to measure properties of the atmosphere. It is similar to…
(more)
▼ LiDAR (an acronym for Light Detection and Ranging) is a technology that can be used to measure properties of the atmosphere. It is similar to radar, but uses much smaller light waves rather than larger radio waves, enabling more detailed information to be obtained.
High Spectral
Resolution Lidar (HSRL) is a lidar technique that uses a
high precision optical filter to distinguish between light that scatters from particulates (such as dust, smoke, or fog) and light that scatters from molecules (such as oxygen, nitrogen, or carbon dioxide) in the atmosphere. By separating the two types of backscattered light, higher accuracy measurements are possible that will enable improvements in climate models, air quality measurements, and climate forecasting. A spaceborne HSRL instrument can provide great impact in these areas by enabling near-continuous measurements across the Earth; however, the optical filter technology has typically been too complex for reliable long-duration spaceflight due to the need for complicated and expensive additional hardware. In this research, a
high-performance HSRL optical filter that can be reliably operated by simply monitoring and adjusting the temperature has been designed, built, and tested. The greatly-reduced operational complexity has been made possible through a new process that enables more accurate prediction of the complicated interactions between the materials of the optical filter. This process is based on a combination of
high-accuracy characterization of the materials and detailed structural-thermal-optical-performance (STOP) modeling. The overall design process, fabrication procedures, and characterization of the optical filter are presented.
Advisors/Committee Members: Heflin, James R. (committeechair), Pickrell, Gary R. (committee member), Suchicital, Carlos T. A. (committee member), Hostetler, Chris A. (committee member).
Subjects/Keywords: High Spectral Resolution Lidar; HSRL; Wide Angle Michelson Interferometer; Field Widened; Aluminum Alloy; Thermal Repeatability; Thermal Tuning; Spectral Filter; Optical Filter; Structural Thermal Optical Performance Model; STOP Analysis; Poisson Effect
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Seaman, S. T. (2019). Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/90799
Chicago Manual of Style (16th Edition):
Seaman, Shane Thomas. “Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter.” 2019. Doctoral Dissertation, Virginia Tech. Accessed March 05, 2021.
http://hdl.handle.net/10919/90799.
MLA Handbook (7th Edition):
Seaman, Shane Thomas. “Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter.” 2019. Web. 05 Mar 2021.
Vancouver:
Seaman ST. Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter. [Internet] [Doctoral dissertation]. Virginia Tech; 2019. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10919/90799.
Council of Science Editors:
Seaman ST. Material Related Effects on the Structural Thermal Optical Performance of a Thermally Tunable Narrowband Interferometric Spectral Filter. [Doctoral Dissertation]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/90799
University of Toronto
29.
Romualdez, Javier.
Design, Implementation, and Operational Methodologies for Sub-Arcsecond Attitude Determination, Control, and Stabilization of the Super-pressure Balloon-borne Imaging Telescope (SuperBIT).
Degree: PhD, 2018, University of Toronto
URL: http://hdl.handle.net/1807/82965
► Scientific balloon-borne instrumentation offers an attractive, competitive, and effective alternative to space-borne missions when considering the overall scope, cost, and development timescale required to design…
(more)
▼ Scientific balloon-borne instrumentation offers an attractive, competitive, and effective alternative to space-borne missions when considering the overall scope, cost, and development timescale required to design and launch scientific instruments. In particular, the balloon-borne environment provides a near-space regime that is suitable for a number of modern astronomical and cosmological experiments, where the atmospheric interference suffered by ground-based instrumentation is negligible at stratospheric altitudes. This work is centered around the analytical strategies and implementation considerations for the attitude determination and control of SuperBIT, a scientific balloon-borne payload capable of meeting the strict sub-arcsecond pointing and image stability requirements demanded by modern cosmological experiments. Broadly speaking, the designed stability specifications of SuperBIT coupled with its observational efficiency, image quality, and accessibility rivals state-of-the-art astronomical observatories such as the Hubble Space Telescope.
To this end, this work presents an end-to-end design methodology for precision pointing balloon-borne payloads such as SuperBIT within an analytical yet implementationally grounded context. Simulation models of SuperBIT are analytically derived to aid in pre-assembly trade-off and case studies that are pertinent to the dynamic balloon-borne environment. From these results, state estimation techniques and control methodologies are extensively developed, leveraging the analytical framework of simulation models and design studies. This pre-assembly design phase is physically validated during assembly, integration, and testing through implementation in real-time hardware and software, which bridges the gap between analytical results and practical application. SuperBIT attitude determination and control is demonstrated throughout two engineering test flights that verify pointing and image stability requirements in flight, where the post-flight results close the overall design loop by suggesting practical improvements to pre-design methodologies.
Overall, the analytical and practical results presented in this work, though centered around the SuperBIT project, provide generically useful and implementationally viable methodologies for
high precision balloon-borne instrumentation, all of which are validated, justified, and improved both theoretically and practically. As such, the continuing development of SuperBIT, built from the work presented in this thesis, strives to further the potential for scientific balloon-borne astronomy in the near future.
Advisors/Committee Members: Damaren, Christopher J, Netterfield, Calvin B, Aerospace Science and Engineering.
Subjects/Keywords: attitude determination and control; balloon-borne telescopes; control systems engineering; diffraction limited imaging; high-resolution wide-field imaging; sub-arcsecond stability; 0538
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Romualdez, J. (2018). Design, Implementation, and Operational Methodologies for Sub-Arcsecond Attitude Determination, Control, and Stabilization of the Super-pressure Balloon-borne Imaging Telescope (SuperBIT). (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/82965
Chicago Manual of Style (16th Edition):
Romualdez, Javier. “Design, Implementation, and Operational Methodologies for Sub-Arcsecond Attitude Determination, Control, and Stabilization of the Super-pressure Balloon-borne Imaging Telescope (SuperBIT).” 2018. Doctoral Dissertation, University of Toronto. Accessed March 05, 2021.
http://hdl.handle.net/1807/82965.
MLA Handbook (7th Edition):
Romualdez, Javier. “Design, Implementation, and Operational Methodologies for Sub-Arcsecond Attitude Determination, Control, and Stabilization of the Super-pressure Balloon-borne Imaging Telescope (SuperBIT).” 2018. Web. 05 Mar 2021.
Vancouver:
Romualdez J. Design, Implementation, and Operational Methodologies for Sub-Arcsecond Attitude Determination, Control, and Stabilization of the Super-pressure Balloon-borne Imaging Telescope (SuperBIT). [Internet] [Doctoral dissertation]. University of Toronto; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/1807/82965.
Council of Science Editors:
Romualdez J. Design, Implementation, and Operational Methodologies for Sub-Arcsecond Attitude Determination, Control, and Stabilization of the Super-pressure Balloon-borne Imaging Telescope (SuperBIT). [Doctoral Dissertation]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/82965
University of Arizona
30.
Katkam, Rajender.
Dual Field of View Optical System for Colonoscope
.
Degree: 2014, University of Arizona
URL: http://hdl.handle.net/10150/332774
► The present dual field of view flexible colonoscope can provide both forward view and radial or backward view of the colon to improve detection of…
(more)
▼ The present dual
field of view flexible colonoscope can provide both forward view and radial or backward view of the colon to improve detection of cancerous polyps. The colonoscope has its own illumination that illuminates the parts of the colon viewed by imaging optics. The optical system, limited only by the diffraction effects at the exit pupil over the entire visible spectrum, can provide
high resolution and is suitable for color imaging. The flexible colonoscope has an on-board sensor at the proximal end of the colonoscope to improve
resolution. The proximal end of colonoscope measures only 8 mm in diameter and 20 mm in length. The present colonoscope has the potential to be scaled down to as small as 6 mm inner diameter from the present 8 mm.
Advisors/Committee Members: Liang, Rongguang (advisor), Banerjee, Bhaskar (committeemember), Koshel, Richard J. (committeemember), Liang, Rongguang (committeemember).
Subjects/Keywords: flexible colonoscope;
high resolution endoscope;
illumination for endoscope;
imaging optics for endoscope;
micro optics for endoscope;
Optical Sciences;
Dual Field of View optics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Katkam, R. (2014). Dual Field of View Optical System for Colonoscope
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/332774
Chicago Manual of Style (16th Edition):
Katkam, Rajender. “Dual Field of View Optical System for Colonoscope
.” 2014. Masters Thesis, University of Arizona. Accessed March 05, 2021.
http://hdl.handle.net/10150/332774.
MLA Handbook (7th Edition):
Katkam, Rajender. “Dual Field of View Optical System for Colonoscope
.” 2014. Web. 05 Mar 2021.
Vancouver:
Katkam R. Dual Field of View Optical System for Colonoscope
. [Internet] [Masters thesis]. University of Arizona; 2014. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/10150/332774.
Council of Science Editors:
Katkam R. Dual Field of View Optical System for Colonoscope
. [Masters Thesis]. University of Arizona; 2014. Available from: http://hdl.handle.net/10150/332774
◁ [1] [2] [3] [4] [5] … [2279] ▶
. 
Open Access Theses and Dissertations