subject:(contact rate)

University of Minnesota

1. White , Lauren A. The effects of heterogeneity in individual infectiousness on disease modeling predictions.

Degree: PhD, Ecology, Evolution and Behavior, 2018, University of Minnesota

URL: http://hdl.handle.net/11299/206294

► Individual variation in infectiousness is generated by heterogeneities in the host, the pathogen, and the environment. However, many models of disease transmission, especially those designed… (more)

Subjects/Keywords: contact networks; contact rate; disease modelling; heterogeneity

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APA (6^th Edition):

White , L. A. (2018). The effects of heterogeneity in individual infectiousness on disease modeling predictions. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/206294

Chicago Manual of Style (16^th Edition):

White , Lauren A. “The effects of heterogeneity in individual infectiousness on disease modeling predictions.” 2018. Doctoral Dissertation, University of Minnesota. Accessed January 19, 2021. http://hdl.handle.net/11299/206294.

MLA Handbook (7^th Edition):

White , Lauren A. “The effects of heterogeneity in individual infectiousness on disease modeling predictions.” 2018. Web. 19 Jan 2021.

Vancouver:

White LA. The effects of heterogeneity in individual infectiousness on disease modeling predictions. [Internet] [Doctoral dissertation]. University of Minnesota; 2018. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/11299/206294.

Council of Science Editors:

White LA. The effects of heterogeneity in individual infectiousness on disease modeling predictions. [Doctoral Dissertation]. University of Minnesota; 2018. Available from: http://hdl.handle.net/11299/206294

2. Karim, Kh Nafis. INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA.

Degree: Embedded Systems, 2015, Mälardalen University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29834

► Measuring physiological parameters or vital sign using camera has become popular in recent years. Contact-less monitoring and extraction of vital signs can be important… (more)

Subjects/Keywords: physiological parameter; Heart-rate; Non-contact

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APA (6^th Edition):

Karim, K. N. (2015). INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA. (Thesis). Mälardalen University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Karim, Kh Nafis. “INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA.” 2015. Thesis, Mälardalen University. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Karim, Kh Nafis. “INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA.” 2015. Web. 19 Jan 2021.

Vancouver:

Karim KN. INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA. [Internet] [Thesis]. Mälardalen University; 2015. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Karim KN. INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA. [Thesis]. Mälardalen University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Ontario Institute of Technology

3. Cleary, James. Encapsulated source contact dose estimates incorporating secondary electron emission.

Degree: 2015, University of Ontario Institute of Technology

URL: http://hdl.handle.net/10155/527

► Secondary electron emission generated at the surface of thin material from interaction with gamma rays form a significant component of the surface dose. The intensity… (more)

Subjects/Keywords: Contact dose rate; MCNPX; Secondary electron

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APA (6^th Edition):

Cleary, J. (2015). Encapsulated source contact dose estimates incorporating secondary electron emission. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/527

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cleary, James. “Encapsulated source contact dose estimates incorporating secondary electron emission.” 2015. Thesis, University of Ontario Institute of Technology. Accessed January 19, 2021. http://hdl.handle.net/10155/527.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cleary, James. “Encapsulated source contact dose estimates incorporating secondary electron emission.” 2015. Web. 19 Jan 2021.

Vancouver:

Cleary J. Encapsulated source contact dose estimates incorporating secondary electron emission. [Internet] [Thesis]. University of Ontario Institute of Technology; 2015. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10155/527.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cleary J. Encapsulated source contact dose estimates incorporating secondary electron emission. [Thesis]. University of Ontario Institute of Technology; 2015. Available from: http://hdl.handle.net/10155/527

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

4. Nathan, Viswam. Characterizing the Noise Associated with Sensor Placement and Motion Artifacts and Overcoming its Effects for Body-worn Physiological Sensors.

Degree: PhD, Computer Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/173453

► Wearable sensors for continuous physiological monitoring have the potential to change the paradigm for healthcare by providing information in scenarios not covered by the existing… (more)

▼ Wearable sensors for continuous physiological monitoring have the potential to change the paradigm for healthcare by providing information in scenarios not covered by the existing clinical model. One key challenge for wearable physiological sensors is that their signal-to-noise ratios are low compared to those of their medical grade counterparts in hospitals. Two primary sources of noise are the sensor-skin contact interface and motion artifacts due to the user’s daily activities. These are challenging problems because the initial sensor placement by the user may not be ideal, the skin conditions can change over time, and the nature of motion artifacts is not predictable. The objective of this research is twofold. The first is to design sensors with reconfigurable contact to mitigate the effects of misplaced sensors or changing skin conditions. The second is to leverage signal processing techniques for accurate physiological parameter estimation despite the presence of motion artifacts. In this research, the sensor contact problem was specifically addressed for dry-contact electroencephalography (EEG). The proposed novel extension to a popular existing EEG electrode design enabled reconfigurable contact to adjust to variations in sensor placement and skin conditions over time. Experimental results on human subjects showed that reconfiguration of contact can reduce the noise in collected EEG signals without the need for manual intervention. To address the motion artifact problem, a particle filter based approach was employed to track the heart rate in cardiac signals affected by the movements of the user. The algorithm was tested on cardiac signals from human subjects running on a treadmill and showed good performance in accurately tracking heart rate. Moreover, the proposed algorithm enables fusion of multiple modalities and is also computationally more efficient compared to other contemporary approaches. Advisors/Committee Members: Jafari, Roozbeh (advisor), Amato, Nancy (committee member), Coté, Gerard L. (committee member), Gutierrez-Osuna, Ricardo (committee member).

Subjects/Keywords: Wearable sensors; skin contact; motion artifacts; EEG; Heart rate; Particle Filter

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APA (6^th Edition):

Nathan, V. (2018). Characterizing the Noise Associated with Sensor Placement and Motion Artifacts and Overcoming its Effects for Body-worn Physiological Sensors. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173453

Chicago Manual of Style (16^th Edition):

Nathan, Viswam. “Characterizing the Noise Associated with Sensor Placement and Motion Artifacts and Overcoming its Effects for Body-worn Physiological Sensors.” 2018. Doctoral Dissertation, Texas A&M University. Accessed January 19, 2021. http://hdl.handle.net/1969.1/173453.

MLA Handbook (7^th Edition):

Nathan, Viswam. “Characterizing the Noise Associated with Sensor Placement and Motion Artifacts and Overcoming its Effects for Body-worn Physiological Sensors.” 2018. Web. 19 Jan 2021.

Vancouver:

Nathan V. Characterizing the Noise Associated with Sensor Placement and Motion Artifacts and Overcoming its Effects for Body-worn Physiological Sensors. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1969.1/173453.

Council of Science Editors:

Nathan V. Characterizing the Noise Associated with Sensor Placement and Motion Artifacts and Overcoming its Effects for Body-worn Physiological Sensors. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173453

George Mason University

5. Kaur, Balvinder. Visible Spectrum Based Non-Contact Detection and Characterization of Blood Wave Signal Dynamics and Applications in Stress Detection .

Degree: 2016, George Mason University

URL: http://hdl.handle.net/1920/10474

► Stress is a major health concern that not only compromises our quality of life, but also affects our health and well-being. Despite its importance, our… (more)

Subjects/Keywords: Electrical engineering; Biomedical engineering; Philosophy; Non-contact Blood Wave Detection; Non-contact Differential Pulse Transit Time; Non-contact Heart Rate Variability; Non-contact Stress Detection; Visible Spectrum based Camera

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APA (6^th Edition):

Kaur, B. (2016). Visible Spectrum Based Non-Contact Detection and Characterization of Blood Wave Signal Dynamics and Applications in Stress Detection . (Thesis). George Mason University. Retrieved from http://hdl.handle.net/1920/10474

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kaur, Balvinder. “Visible Spectrum Based Non-Contact Detection and Characterization of Blood Wave Signal Dynamics and Applications in Stress Detection .” 2016. Thesis, George Mason University. Accessed January 19, 2021. http://hdl.handle.net/1920/10474.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kaur, Balvinder. “Visible Spectrum Based Non-Contact Detection and Characterization of Blood Wave Signal Dynamics and Applications in Stress Detection .” 2016. Web. 19 Jan 2021.

Vancouver:

Kaur B. Visible Spectrum Based Non-Contact Detection and Characterization of Blood Wave Signal Dynamics and Applications in Stress Detection . [Internet] [Thesis]. George Mason University; 2016. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1920/10474.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kaur B. Visible Spectrum Based Non-Contact Detection and Characterization of Blood Wave Signal Dynamics and Applications in Stress Detection . [Thesis]. George Mason University; 2016. Available from: http://hdl.handle.net/1920/10474

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

6. Nguyen, Van. Non-contact physiologically related motion sensing with ultra-wideband impulse radar.

Degree: PhD, Electrical and Computer Engineering, 2016, Georgia Tech

URL: http://hdl.handle.net/1853/59142

► Impulse Radio Ultra-wideband (IR-UWB) radar is a promising tool for non-contact, non-invasive sensing of physiological parameters, which could be valuable in identifying or preventing clinical… (more)

▼ Impulse Radio Ultra-wideband (IR-UWB) radar is a promising tool for non-contact, non-invasive sensing of physiological parameters, which could be valuable in identifying or preventing clinical disorders. This research investigates the use of IR-UWB radar in monitoring of physiological parameters, e.g. respiration rate, heart rate, and cardiopulmonary chest wall displacement. The dissertation has two major parts. The first part consists of novel theoretical analysis of the radar received signal due to arbitrary periodic displacement of the heart and lungs. The second part consists of algorithm development, where estimation methods are developed to estimate a range of physiological parameters. In particular, for heart rate detection, estimation algorithms ranging from heuristic regime to sequential Bayesian filtering have been developed, leveraging HR harmonics, tracking, and motion artifact removal. The performance of these algorithms are evaluated with real-world experimental data from human subjects lying on a bed with an under-the-mattress UWB radar. This research is also concerned with the reconstruction of chest wall displacement from the IR-UWB radar signal. There are several novel aspects of the proposed method. First, only a tiny fraction of the bandwidth of the received spectrum is needed to reconstruct the entire displacement waveform. Since only a tiny fraction of the UWB bandwidth needs to be retained, the required sampling rate is substantially reduced. Second, the maximum likelihood estimator of the displacement is obtained, and the bias and Cramer-Rao lower bound are derived. Finally, in order to further improve estimation accuracy, a denoising method such as empirical mode decomposition is applied on the maximum likelihood estimates. This dissertation also proposes a method that quantifies body-macro movement, such as limb movement, and detects a posture change. The method is set up as a hypothesis test, where the decision threshold between the null and alternative hypotheses are calculated from statistics obtained from experimental data. Advisors/Committee Members: Weitnauer, Mary Ann (advisor), Lanterman, Aaron D. (committee member), Vidakovic, Brani (committee member), Anderson, David V. (committee member), Inan, Omer T. (committee member).

Subjects/Keywords: Non-contact; UWB radar; Heart rate estimation; Respiration rate estimation; Chest displacement estimation; Posture change detection; Vital signs monitoring

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APA (6^th Edition):

Nguyen, V. (2016). Non-contact physiologically related motion sensing with ultra-wideband impulse radar. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/59142

Chicago Manual of Style (16^th Edition):

Nguyen, Van. “Non-contact physiologically related motion sensing with ultra-wideband impulse radar.” 2016. Doctoral Dissertation, Georgia Tech. Accessed January 19, 2021. http://hdl.handle.net/1853/59142.

MLA Handbook (7^th Edition):

Nguyen, Van. “Non-contact physiologically related motion sensing with ultra-wideband impulse radar.” 2016. Web. 19 Jan 2021.

Vancouver:

Nguyen V. Non-contact physiologically related motion sensing with ultra-wideband impulse radar. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1853/59142.

Council of Science Editors:

Nguyen V. Non-contact physiologically related motion sensing with ultra-wideband impulse radar. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/59142

University of Ottawa

7. Ghodratigohar, Mohammad. A Machine Learning-Based Non-Contact Respiratory Rate Monitoring Method Using an RGB Camera .

Degree: 2019, University of Ottawa

URL: http://hdl.handle.net/10393/39345

► Non-contact measurement of Respiratory Rate (RR) is suitable for various clinical and home-based healthcare applications. RR monitoring can inform healthcare providers of early indicators of… (more)

Subjects/Keywords: Non-Contact Respiratory Rate Measurement; Remote Photoplethysmography (rPPG); Independent Component Analysis (ICA); CEEMDAN

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APA (6^th Edition):

Ghodratigohar, M. (2019). A Machine Learning-Based Non-Contact Respiratory Rate Monitoring Method Using an RGB Camera . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/39345

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ghodratigohar, Mohammad. “A Machine Learning-Based Non-Contact Respiratory Rate Monitoring Method Using an RGB Camera .” 2019. Thesis, University of Ottawa. Accessed January 19, 2021. http://hdl.handle.net/10393/39345.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ghodratigohar, Mohammad. “A Machine Learning-Based Non-Contact Respiratory Rate Monitoring Method Using an RGB Camera .” 2019. Web. 19 Jan 2021.

Vancouver:

Ghodratigohar M. A Machine Learning-Based Non-Contact Respiratory Rate Monitoring Method Using an RGB Camera . [Internet] [Thesis]. University of Ottawa; 2019. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10393/39345.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghodratigohar M. A Machine Learning-Based Non-Contact Respiratory Rate Monitoring Method Using an RGB Camera . [Thesis]. University of Ottawa; 2019. Available from: http://hdl.handle.net/10393/39345

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Canterbury

8. Wiechern, Beth Justina. Analysis of breathing during oral reading by young children with and without asthma using non-contact respiratory monitoring methods : a preliminary study of task and reading difficulty effects.

Degree: MS, Health Sciences, 2014, University of Canterbury

URL: http://dx.doi.org/10.26021/8830

► The aim of this research was to investigate the breathing patterns of children aged 5-9 years with asthma as they read aloud stories of increasingly… (more)

Subjects/Keywords: Asthma; children; breathing; reading; non-contact respiratory methods; pause time; breathing rate

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APA (6^th Edition):

Wiechern, B. J. (2014). Analysis of breathing during oral reading by young children with and without asthma using non-contact respiratory monitoring methods : a preliminary study of task and reading difficulty effects. (Masters Thesis). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/8830

Chicago Manual of Style (16^th Edition):

Wiechern, Beth Justina. “Analysis of breathing during oral reading by young children with and without asthma using non-contact respiratory monitoring methods : a preliminary study of task and reading difficulty effects.” 2014. Masters Thesis, University of Canterbury. Accessed January 19, 2021. http://dx.doi.org/10.26021/8830.

MLA Handbook (7^th Edition):

Wiechern, Beth Justina. “Analysis of breathing during oral reading by young children with and without asthma using non-contact respiratory monitoring methods : a preliminary study of task and reading difficulty effects.” 2014. Web. 19 Jan 2021.

Vancouver:

Wiechern BJ. Analysis of breathing during oral reading by young children with and without asthma using non-contact respiratory monitoring methods : a preliminary study of task and reading difficulty effects. [Internet] [Masters thesis]. University of Canterbury; 2014. [cited 2021 Jan 19]. Available from: http://dx.doi.org/10.26021/8830.

Council of Science Editors:

Wiechern BJ. Analysis of breathing during oral reading by young children with and without asthma using non-contact respiratory monitoring methods : a preliminary study of task and reading difficulty effects. [Masters Thesis]. University of Canterbury; 2014. Available from: http://dx.doi.org/10.26021/8830

Texas A&M University

9. Dominguez, Brandon James. Characterization of livestock herds in extensive agricultural settings in southwest Texas.

Degree: MS, Epidemiology, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1302

► Because of an ever-increasing threat of foreign animal disease outbreaks in the United States, there is a desire to develop strategies to prevent the occurrence… (more)

Subjects/Keywords: extensively managed livestock; modeling; density; contact rate

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APA (6^th Edition):

Dominguez, B. J. (2009). Characterization of livestock herds in extensive agricultural settings in southwest Texas. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1302

Chicago Manual of Style (16^th Edition):

Dominguez, Brandon James. “Characterization of livestock herds in extensive agricultural settings in southwest Texas.” 2009. Masters Thesis, Texas A&M University. Accessed January 19, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1302.

MLA Handbook (7^th Edition):

Dominguez, Brandon James. “Characterization of livestock herds in extensive agricultural settings in southwest Texas.” 2009. Web. 19 Jan 2021.

Vancouver:

Dominguez BJ. Characterization of livestock herds in extensive agricultural settings in southwest Texas. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1302.

Council of Science Editors:

Dominguez BJ. Characterization of livestock herds in extensive agricultural settings in southwest Texas. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1302

10. Mejia Salazar, Maria Fernanda 1982-. Social dynamics among mule deer and how they visit various environmental areas: implications for chronic wasting disease transmission.

Degree: 2017, University of Saskatchewan

URL: http://hdl.handle.net/10388/7839

► This dissertation analyzes sociality patterns of mule deer (Odocoileus hemionus) and how they visit different localized environmental areas, two epidemiologically relevant sources of variability in… (more)

▼ This dissertation analyzes sociality patterns of mule deer (Odocoileus hemionus) and how they visit different localized environmental areas, two epidemiologically relevant sources of variability in chronic wasting disease (CWD) transmission dynamics. This dissertation seeks to answer questions such as what are the seasonal patterns of mule deer group formation and size, what factors can predict close-distance proximity and physical contacts between individuals, and in which environmental areas are different sex and age classes of deer found throughout the year. These questions are of great relevance in the study of a disease that efficiently transmits through animal-animal contact and prion contaminated environments. Mule deer in Antelope Creek, a CWD endemic area in Saskatchewan, Canada, have been studied since 2006. I used genetic, behavioural, camera-trap, and high-resolution and high-frequency radio-telemetry data to address these questions. First, we learned that when mule deer showed clinical signs of the disease they were less likely to be reported in groups. Second, males were more likely to be found in close-distance proximity with other males in pre-rut, and with females in rut. Also, females tended to have more stable and longer lasting relationships with any other females than with males, whereas male-male relationships tended to be ephemeral. Third, individuals grouped more often with their close relatives, but the latter were not more likely to physically contact each other within groups. Lastly, grain spills were the sites most visited by deer and where they contacted the environment most often with either their mouths and antlers, or by defecating and urinating. Hence, grain spills could be of great importance for disease control, as they can be modified to reduce mule deer congregation, environmental prion contamination and transmission. This dissertation describes several features of mule deer social behaviour, which advances our understanding of their sociobiology. These findings provide insight into how CWD may be transmitted in wild cervids and will be useful in the further development of spatially- and behaviourally-explicit dynamic epidemiological models to guide CWD management strategies. Advisors/Committee Members: Bollinger, Trent, Waldner, Cheryl, Osgood, Nathaniel, Shury, Todd, Stookey, Joseph, Hwang, Yeen Ten, Simko, Elemir.

Subjects/Keywords: association index; cervid; chronic wasting disease; contact rate; disease transmission; environmental prion contamination; interaction rate; mule deer; prion; prion environmental exposure; radio-telemetry; reciprocity; social affinity; sociality; trail camera; visitation rate; wildlife disease

11 more images…

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APA (6^th Edition):

Mejia Salazar, M. F. 1. (2017). Social dynamics among mule deer and how they visit various environmental areas: implications for chronic wasting disease transmission. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7839

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mejia Salazar, Maria Fernanda 1982-. “Social dynamics among mule deer and how they visit various environmental areas: implications for chronic wasting disease transmission.” 2017. Thesis, University of Saskatchewan. Accessed January 19, 2021. http://hdl.handle.net/10388/7839.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mejia Salazar, Maria Fernanda 1982-. “Social dynamics among mule deer and how they visit various environmental areas: implications for chronic wasting disease transmission.” 2017. Web. 19 Jan 2021.

Vancouver:

Mejia Salazar MF1. Social dynamics among mule deer and how they visit various environmental areas: implications for chronic wasting disease transmission. [Internet] [Thesis]. University of Saskatchewan; 2017. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10388/7839.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mejia Salazar MF1. Social dynamics among mule deer and how they visit various environmental areas: implications for chronic wasting disease transmission. [Thesis]. University of Saskatchewan; 2017. Available from: http://hdl.handle.net/10388/7839

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queensland University of Technology

11. Athukorala, Asitha Chandimal. Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue.

Degree: 2016, Queensland University of Technology

URL: https://eprints.qut.edu.au/95626/

► The work in this thesis comprehensively investigates the effects of non-uniform material behaviour exhibited by head-hardened Australian rail steel on ratcheting, wear and rolling-contact fatigue.… (more)

Subjects/Keywords: rolling-contact fatigue; ratcheting; AS1085.1 standards; twin-disc; hardened rail; wear rate; surface replication; wear debris; surface and subsurface fatigue;

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APA (6^th Edition):

Athukorala, A. C. (2016). Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/95626/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Athukorala, Asitha Chandimal. “Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue.” 2016. Thesis, Queensland University of Technology. Accessed January 19, 2021. https://eprints.qut.edu.au/95626/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Athukorala, Asitha Chandimal. “Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue.” 2016. Web. 19 Jan 2021.

Vancouver:

Athukorala AC. Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue. [Internet] [Thesis]. Queensland University of Technology; 2016. [cited 2021 Jan 19]. Available from: https://eprints.qut.edu.au/95626/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Athukorala AC. Investigation of wear and ratcheting response of head-hardened Australian rail steel under conditions of rolling contact fatigue. [Thesis]. Queensland University of Technology; 2016. Available from: https://eprints.qut.edu.au/95626/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

12. Alshawaf, Hussain M J A A M A. A Novel Thermal Method for Pipe Flow Measurements Using a Non-invasive BTU Meter.

Degree: MS, Mechanical Engineering, 2018, Virginia Tech

URL: http://hdl.handle.net/10919/101528

► This work presents the development of a novel and non-invasive method that measures fluid flow rate and temperature in pipes. While current non-invasive flow meters… (more)

▼ This work presents the development of a novel and non-invasive method that measures fluid flow rate and temperature in pipes. While current non-invasive flow meters are able to measure pipe flow rate, they cannot simultaneously measure the internal temperature of the fluid flow, which limits their widespread application. Moreover, devices that are able to determine flow temperature are primarily intrusive and require constant maintenance, which can shut down operation, resulting in downtime and economic loss. Consequently, non-invasive flow rate and temperature measurement systems are becoming increasingly attractive for a variety of operations, including for use in leak detection, energy metering, energy optimization, and oil and gas production, to name a few. In this work, a new solution method and parameter estimation scheme are developed and deployed to non-invasively determine fluid flow rate and temperature in a pipe. This new method is utilized in conjunction with a sensor-based apparatus – "namely, the Combined Heat Flux and Temperature Sensor (CHFT+), which employs simultaneous heat flux and temperature measurements for non-invasive thermal interrogation (NITI). In this work, the CHFT+ sensor embodiment is referred to as the British Thermal Unit (BTU) Meter. The fluid's flow rate and temperature are determined by estimating the fluid's convection heat transfer coefficient and the sensor-pipe thermal contact resistance. The new solution method and parameter estimation scheme were validated using both simulated and experimental data. The experimental data was validated for accuracy using a commercially available FR1118P10 Inline Flowmeter by Sotera Systems (Fort Wayne, IN) and a ThermaGate sensor by ThermaSENSE Corp. (Roanoke, VA). This study's experimental results displayed excellent agreement with values estimated from the aforementioned methods. Once tested in conjunction with the non-invasive BTU Meter, the proposed solution and parameter estimation scheme displayed an excellent level of validity and reliability in the results. Given the proposed BTU Meter's non-invasive design and experimental results, the developed solution and parameter estimation scheme shows promise for use in a variety of different residential, commercial, and industrial applications. Advisors/Committee Members: Diller, Thomas E (committeechair), Wicks, Alfred L (committee member), Ellis, Michael W (committee member).

Subjects/Keywords: Pipe Flow Rate; Non-Invasive; Heat Flux; Fluid Temperature; Parameter Estimation; Convection Heat Transfer Coefficient; Thermal Contact Resistance; Energy Transfer; Non-Invasive Thermal Interrogation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alshawaf, H. M. J. A. A. M. A. (2018). A Novel Thermal Method for Pipe Flow Measurements Using a Non-invasive BTU Meter. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/101528

Chicago Manual of Style (16^th Edition):

Alshawaf, Hussain M J A A M A. “A Novel Thermal Method for Pipe Flow Measurements Using a Non-invasive BTU Meter.” 2018. Masters Thesis, Virginia Tech. Accessed January 19, 2021. http://hdl.handle.net/10919/101528.

MLA Handbook (7^th Edition):

Alshawaf, Hussain M J A A M A. “A Novel Thermal Method for Pipe Flow Measurements Using a Non-invasive BTU Meter.” 2018. Web. 19 Jan 2021.

Vancouver:

Alshawaf HMJAAMA. A Novel Thermal Method for Pipe Flow Measurements Using a Non-invasive BTU Meter. [Internet] [Masters thesis]. Virginia Tech; 2018. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10919/101528.

Council of Science Editors:

Alshawaf HMJAAMA. A Novel Thermal Method for Pipe Flow Measurements Using a Non-invasive BTU Meter. [Masters Thesis]. Virginia Tech; 2018. Available from: http://hdl.handle.net/10919/101528

University of Maryland

13. Rapatski, Brandy Lynn. The Non-Linear Transmission Dynamics of HIV/AIDS.

Degree: Applied Mathematics and Scientific Computation, 2004, University of Maryland

URL: http://hdl.handle.net/1903/1983

► How infectious a person is when infected with HIV depends upon what stage of the disease the person is in. We use three stages which… (more)

Subjects/Keywords: Mathematics; Human immunodeficiency virus; infectiousness; transmission dynamics; mathematical modeling; effective contact rate

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APA (6^th Edition):

Rapatski, B. L. (2004). The Non-Linear Transmission Dynamics of HIV/AIDS. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/1983

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rapatski, Brandy Lynn. “The Non-Linear Transmission Dynamics of HIV/AIDS.” 2004. Thesis, University of Maryland. Accessed January 19, 2021. http://hdl.handle.net/1903/1983.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rapatski, Brandy Lynn. “The Non-Linear Transmission Dynamics of HIV/AIDS.” 2004. Web. 19 Jan 2021.

Vancouver:

Rapatski BL. The Non-Linear Transmission Dynamics of HIV/AIDS. [Internet] [Thesis]. University of Maryland; 2004. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1903/1983.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rapatski BL. The Non-Linear Transmission Dynamics of HIV/AIDS. [Thesis]. University of Maryland; 2004. Available from: http://hdl.handle.net/1903/1983

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

14. Kim, Sukwon. Relationships between Hamstring Activation Rate and Biomechanics of Slip-induced Falls among Young and Older Adults.

Degree: MS, Industrial and Systems Engineering, 2003, Virginia Tech

URL: http://hdl.handle.net/10919/43308

► This study was conducted to investigate whether hamstring muscle activation rate could potentially serve as an indicator for slip-induced falls, particularly for older adults. Kinematics… (more)

Subjects/Keywords: Friction demand (RCOF); Heel contact velocity; Hamstring activation rate; Falls

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APA (6^th Edition):

Kim, S. (2003). Relationships between Hamstring Activation Rate and Biomechanics of Slip-induced Falls among Young and Older Adults. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/43308

Chicago Manual of Style (16^th Edition):

Kim, Sukwon. “Relationships between Hamstring Activation Rate and Biomechanics of Slip-induced Falls among Young and Older Adults.” 2003. Masters Thesis, Virginia Tech. Accessed January 19, 2021. http://hdl.handle.net/10919/43308.

MLA Handbook (7^th Edition):

Kim, Sukwon. “Relationships between Hamstring Activation Rate and Biomechanics of Slip-induced Falls among Young and Older Adults.” 2003. Web. 19 Jan 2021.

Vancouver:

Kim S. Relationships between Hamstring Activation Rate and Biomechanics of Slip-induced Falls among Young and Older Adults. [Internet] [Masters thesis]. Virginia Tech; 2003. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10919/43308.

Council of Science Editors:

Kim S. Relationships between Hamstring Activation Rate and Biomechanics of Slip-induced Falls among Young and Older Adults. [Masters Thesis]. Virginia Tech; 2003. Available from: http://hdl.handle.net/10919/43308

University of Akron

15. Acharya, Sunil. Micromechanics of Asperity Interaction in Wear – A Numerical Approach.

Degree: PhD, Polymer Engineering, 2005, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571

► In last 50 years, research on elastomer wear has produced qualitative and statistical data regarding wear debris and associated morphologies. However, the exact wear mechanism… (more)

Subjects/Keywords: Wear; Rubber; Elastomer; Contact Mechanics; Fracture Mechanics; Energy Release Rate; Finite Element Analysis

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APA (6^th Edition):

Acharya, S. (2005). Micromechanics of Asperity Interaction in Wear – A Numerical Approach. (Doctoral Dissertation). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571

Chicago Manual of Style (16^th Edition):

Acharya, Sunil. “Micromechanics of Asperity Interaction in Wear – A Numerical Approach.” 2005. Doctoral Dissertation, University of Akron. Accessed January 19, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571.

MLA Handbook (7^th Edition):

Acharya, Sunil. “Micromechanics of Asperity Interaction in Wear – A Numerical Approach.” 2005. Web. 19 Jan 2021.

Vancouver:

Acharya S. Micromechanics of Asperity Interaction in Wear – A Numerical Approach. [Internet] [Doctoral dissertation]. University of Akron; 2005. [cited 2021 Jan 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571.

Council of Science Editors:

Acharya S. Micromechanics of Asperity Interaction in Wear – A Numerical Approach. [Doctoral Dissertation]. University of Akron; 2005. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571

16. Kiehl, Zachary Adam. Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System.

Degree: MSBME, Biomedical Engineering, 2015, Wright State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1430403954

► Non-contact imaging photoplethysmography is an exciting new field based on the principles of traditional photoplethysmography where viable signals can now be acquired without the use… (more)

Subjects/Keywords: Biomedical Engineering; Biomedical Research; Imaging Photoplethysmography; Heart Rate Variability; Pulse Rate Variability; Non-Contact Photoplethysmography; Non-Contact Monitoring; Motion Artifact

…of electromagnetic-based systems for non-contact heart rate monitoring also include laser… …method of non-contact heart rate monitoring is the image-based monitoring systems. Although nc… …contact heart rate monitoring (Garbey et al., 2007). PPG systems especially began to 6… …take over the field of non-contact heart rate monitoring when successful nc-iPPG systems… …non-contact monitoring of heart and respiration rate. 1.3 Introduction to Heart and Pulse…

10 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kiehl, Z. A. (2015). Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1430403954

Chicago Manual of Style (16^th Edition):

Kiehl, Zachary Adam. “Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System.” 2015. Masters Thesis, Wright State University. Accessed January 19, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1430403954.

MLA Handbook (7^th Edition):

Kiehl, Zachary Adam. “Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System.” 2015. Web. 19 Jan 2021.

Vancouver:

Kiehl ZA. Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System. [Internet] [Masters thesis]. Wright State University; 2015. [cited 2021 Jan 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1430403954.

Council of Science Editors:

Kiehl ZA. Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System. [Masters Thesis]. Wright State University; 2015. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1430403954

Texas A&M University

17. De La Garza, Guadalupe Ray, III. Effective contact of cattle and feral swine facilitating potential foot-and-mouth disease virus transmission in southern Texas, USA rangeland.

Degree: MS, Wildlife and Fisheries Sciences, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1387

► For the second study, a web-based survey was developed and distributed to all members of four major health education organizations. A total of 1,925 HEs’… (more)

▼ For the second study, a web-based survey was developed and distributed to all members of four major health education organizations. A total of 1,925 HEs’ completed the survey and 1,607 responses were utilized in the final analysis. This study indicated that participants had deficient knowledge and unfavorable attitudes toward the CDCproposed genomic competencies. In the third study, a theoretical model was developed to predict HEs’ likelihood to incorporate genomic competencies into their practice. Using techniques from Structural Equation Modeling (SEM), the model was tested with the same data of the second study. Findings supported the proposed theoretical model. While genomic knowledge, attitudes, and self-efficacy were significantly associated with HEs’ likelihood to incorporate genomic competencies into their practice, attitudes was the strongest predictor of likelihood. In summary, these studies indicated that participating HEs had deficient genomic knowledge, unfavorable attitudes toward a set of CDC-proposed genomic competencies, and low likelihood to adopt genomic competencies into health promotion. Relevant training should be developed and advocated. As the SEM analysis results indicated the survey findings supported the proposed theoretical model, which can be utilized to steer future training for HEs. statistics, 2) unadjusted inferential statistics, 3) stratified analysis, and 4) multivariable models. My investigation produced results in accord with generally accepted notions in addition to significant findings that interestingly counter current preconceptions. Intraspecies contact was more common than inter-species, with indirect contact occurring more frequently than direct. Direct contact between species occurred extremely rarely. The most important factors that influenced the rate of contact for both species were water, winter, and cultivated fields. Information regarding probability of infectious agent survival and transfer will be used in the future to advance current epidemiological models, including geographicautomata (Ward et al. 2007: In Press) and cellular automata models (Doran and Laffan 2005) to better understand and manage integrated domestic cattle and free-ranging wildlife populations. Such modeling provides essential and necessary knowledge for developing prevention, detection, response, and recovery strategies – employed in advance, during, and after a disease outbreak, respectively. Advisors/Committee Members: Cooper, Susan M. (advisor), Scott, H. Morgan (advisor), Cathey, James C. (committee member), Lopez, Roel R. (committee member).

Subjects/Keywords: effective contact rate; FMDv; epidemiology; wildlife disease management; feral swine; sus scrofa; direct indirect contact; inter-species; intra-species; modeling

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APA (6^th Edition):

De La Garza, Guadalupe Ray, I. (2009). Effective contact of cattle and feral swine facilitating potential foot-and-mouth disease virus transmission in southern Texas, USA rangeland. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1387

Chicago Manual of Style (16^th Edition):

De La Garza, Guadalupe Ray, III. “Effective contact of cattle and feral swine facilitating potential foot-and-mouth disease virus transmission in southern Texas, USA rangeland.” 2009. Masters Thesis, Texas A&M University. Accessed January 19, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1387.

MLA Handbook (7^th Edition):

De La Garza, Guadalupe Ray, III. “Effective contact of cattle and feral swine facilitating potential foot-and-mouth disease virus transmission in southern Texas, USA rangeland.” 2009. Web. 19 Jan 2021.

Vancouver:

De La Garza, Guadalupe Ray I. Effective contact of cattle and feral swine facilitating potential foot-and-mouth disease virus transmission in southern Texas, USA rangeland. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1387.

Council of Science Editors:

De La Garza, Guadalupe Ray I. Effective contact of cattle and feral swine facilitating potential foot-and-mouth disease virus transmission in southern Texas, USA rangeland. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1387

Queensland University of Technology

18. Roshani, Shila. The effect of ocular surface conditions on blink rate and completeness.

Degree: 2011, Queensland University of Technology

URL: https://eprints.qut.edu.au/46262/

► A healthy human would be expected to show periodic blinks, making a brief closure of the eyelids. Most blinks are spontaneous, occurring regularly with no… (more)

▼ A healthy human would be expected to show periodic blinks, making a brief closure of the eyelids. Most blinks are spontaneous, occurring regularly with no external stimulus. However a reflex blink can occur in response to external stimuli such as a bright light, a sudden loud noise, or an object approaching toward the eyes. A voluntary or forced blink is another type of blink in which the person deliberately closes the eyes and the lower eyelid raises to meet the upper eyelid. A complete blink, in which the upper eyelid touches the lower eyelid, contributes to the health of ocular surface by providing a fresh layer of tears as well as maintaining optical integrity by providing a smooth tear film over the cornea. The rate of blinking and its completeness vary depending on the task undertaken during blink assessment, the direction of gaze, the emotional state of the subjects and the method under which the blink was measured. It is also well known that wearing contact lenses (both rigid and soft lenses) can induce significant changes in blink rate and completeness. It is been established that efficient blinking plays an important role in ocular surface health during contact lens wear and for improving contact lens performance and comfort. Inefficient blinking during contact lens wear may be related to a low blink rate or incomplete blinking and can often be a reason for dry eye symptoms or ocular surface staining. It has previously been shown that upward gaze can affect blink rate, causing it to become faster. In the first experiment, it was decided to expand on previous studies in this area by examining the effect of various gaze directions (i.e. upward gaze, primary gaze, downward gaze and lateral gaze) as well as head angle (recumbent position) on normal subjects’ blink rate and completeness through the use of filming with a high-speed camera. The results of this experiment showed that as the open palpebral aperture (and exposed ocular surface area) increased from downward gaze to upward gaze, the number of blinks significantly increased (p<0.04). Also, the size of closed palpebral aperture significantly increased from downward gaze to upward gaze (p<0.005). A weak positive correlation (R² = 0.18) between the blink rate and ocular surface area was found in this study. Also, it was found that the subjects showed 81% complete blinks, 19% incomplete blinks and 2% of twitch blinks in primary gaze, consistent with previous studies. The difference in the percentage of incomplete blinks between upward gaze and downward gaze was significant (p<0.004), showing more incomplete blinks in upward gaze. The findings of this experiment suggest that while blink rate becomes slower in downward gaze, the completeness of blinking is typically better, thereby potentially reducing the risk of tear instability. On the other hand, in upward gaze while the completeness of blinking becomes worse, this is potentially offset by increased blink frequency. In addition, blink rate and completeness were not affected by lateral gaze or head…

Subjects/Keywords: blinking, blink rate, inter-blink interval, blink completeness, closed palpebral aperture, open palpebral aperture, exposed ocular surface area, position of gaze, eyelids, soft sphere contact lens, soft toric contact lens, rigid lens (RGP); anaesthetic eye drops

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APA (6^th Edition):

Roshani, S. (2011). The effect of ocular surface conditions on blink rate and completeness. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/46262/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Roshani, Shila. “The effect of ocular surface conditions on blink rate and completeness.” 2011. Thesis, Queensland University of Technology. Accessed January 19, 2021. https://eprints.qut.edu.au/46262/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Roshani, Shila. “The effect of ocular surface conditions on blink rate and completeness.” 2011. Web. 19 Jan 2021.

Vancouver:

Roshani S. The effect of ocular surface conditions on blink rate and completeness. [Internet] [Thesis]. Queensland University of Technology; 2011. [cited 2021 Jan 19]. Available from: https://eprints.qut.edu.au/46262/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Roshani S. The effect of ocular surface conditions on blink rate and completeness. [Thesis]. Queensland University of Technology; 2011. Available from: https://eprints.qut.edu.au/46262/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Noyel, Jean-Philippe. Analyse de l’initiation de fissures en fatigue de contact : Approche mésoscopique : Analysis of crack initiation in rolling contact fatigue : A mesoscopic approach.

Degree: Docteur es, Mécanique, 2015, INSA Lyon

URL: http://www.theses.fr/2015ISAL0126

►

La fatigue de contact est un des modes de défaillance prédominants des composants tels que les engrenages ou les roulements. Les mécanismes d’initiation de fissures… (more)

▼

La fatigue de contact est un des modes de défaillance prédominants des composants tels que les engrenages ou les roulements. Les mécanismes d’initiation de fissures associés à ce mode de défaillance sont fortement liés à la microstructure du matériau. Cependant, la plupart des modèles utilisés pour prédire la durée de vie se situent à l’échelle macroscopique. Un modèle basé sur une représentation de type Voronoi des grains (échelle mésoscopique) est développé afin d’analyser les mécanismes d’initiation. Le concept d’endommagement est appliqué aux joints de grain modélisés par la méthode des zones cohésives. L’objectif de ce modèle est (i) de contribuer à une meilleure compréhension de l’influence de paramètres tels que ceux liés aux conditions de contact (rugosité, lubrification) ou aux matériaux (présence d’inclusions ou gradients de propriétés et contraintes résiduelles générés par les traitements de surface…) sur les mécanismes d’initiation et (ii) de fournir une estimation de la durée de vie jusqu’à cette initiation. Un premier modèle 2D isotrope a permis de mettre en place l’approche proposée et d’analyser le comportement numérique des éléments cohésifs : influence de la valeur des raideurs cohésives et apparition de singularités aux jonctions triples. Cette singularité semble inévitable, mais l’approche consistant à considérer le joint de grain comme une unique entité, et donc à utiliser des valeurs moyennes le long du joint de grain permet de s’affranchir de cette singularité. La représentativité du modèle a ensuite été améliorée par la modélisation de l’anisotropie cristalline. Un modèle de type élasticité cubique a été utilisé pour modéliser le comportement des grains. Enfin, une analyse approfondie de l’application du concept d’endommagement aux joints de grains a permis de proposer une nouvelle formulation entraînant une influence plus réaliste de cet endommagement sur le cisaillement intergranulaire et conduisant à une durée de vie estimée (apparition des premières micro-fissures) d’un ordre de grandeur comparable à celles données par l’expérience.

Contact fatigue is the predominant mode of failure of components subjected to a repeated contact pressure, like rolling element bearings or gears. This phenomenon is known as rolling contact fatigue (RCF). A large number of models have been developed to predict RCF, but there is today no complete predictive life model, and understanding RCF failure mechanism remains a significant challenge. RCF failure mechanisms are known to be very sensitive to a large number of parameters linked to contact conditions (roughness, lubrication) or materials (inclusions, gradients properties, residual stresses…). To improve knowledge about the influence of these parameters on failure mechanisms and life, a numerical model is developed to simulate the progressive damage of a component subject to rolling contact fatigue. Mechanisms associated with the initiation stage of failure process are located at a scale lower than the macroscopic scale. The proposed approach is to develop…

Advisors/Committee Members: Jacquet, Philippe (thesis director), Ville, Fabrice (thesis director).

Subjects/Keywords: Fatigue de contact; Mécanique; Endommagement; Endommagement mécanique; Fissures de fatigue courtes; Fissures; Approche mésoscopique; Cisaillement; Microstructure; Anisotropie; Tribologie; Rolling fatigue contact; Mechanics; Damage; Damage monitoring; Cracks; Crack propagation rate; Mesoscopic approach; Microstructure; Anisotropy; Tribology; 621.890 72

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Noyel, J. (2015). Analyse de l’initiation de fissures en fatigue de contact : Approche mésoscopique : Analysis of crack initiation in rolling contact fatigue : A mesoscopic approach. (Doctoral Dissertation). INSA Lyon. Retrieved from http://www.theses.fr/2015ISAL0126

Chicago Manual of Style (16^th Edition):

Noyel, Jean-Philippe. “Analyse de l’initiation de fissures en fatigue de contact : Approche mésoscopique : Analysis of crack initiation in rolling contact fatigue : A mesoscopic approach.” 2015. Doctoral Dissertation, INSA Lyon. Accessed January 19, 2021. http://www.theses.fr/2015ISAL0126.

MLA Handbook (7^th Edition):

Noyel, Jean-Philippe. “Analyse de l’initiation de fissures en fatigue de contact : Approche mésoscopique : Analysis of crack initiation in rolling contact fatigue : A mesoscopic approach.” 2015. Web. 19 Jan 2021.

Vancouver:

Noyel J. Analyse de l’initiation de fissures en fatigue de contact : Approche mésoscopique : Analysis of crack initiation in rolling contact fatigue : A mesoscopic approach. [Internet] [Doctoral dissertation]. INSA Lyon; 2015. [cited 2021 Jan 19]. Available from: http://www.theses.fr/2015ISAL0126.

Council of Science Editors:

Noyel J. Analyse de l’initiation de fissures en fatigue de contact : Approche mésoscopique : Analysis of crack initiation in rolling contact fatigue : A mesoscopic approach. [Doctoral Dissertation]. INSA Lyon; 2015. Available from: http://www.theses.fr/2015ISAL0126

Louisiana State University

20. Rao, Sai Sashankh. Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels.

Degree: PhD, Mechanical Engineering, 2015, Louisiana State University

URL: etd-08212015-014524 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1087

► Microfluidics is a burgeoning research area with applications ranging from microfluidic cooling to biomolecule synthesis. Here we study two problems to gain an improved… (more)

▼ Microfluidics is a burgeoning research area with applications ranging from microfluidic cooling to biomolecule synthesis. Here we study two problems to gain an improved understanding of two-phase flow and heat transfer in microfluidic devices. We also study a third problem on boundary layer flow out of theoretical interest. In the first problem, we study the heat and mass transfer in polygonal micro heat pipes under small imposed temperature differences. A micro heat pipe, used in electronics cooling, consists of a closed polygonal microchannel filled with a wetting liquid and a long vapor bubble. We model the evaporation, fluid flow, and heat transfer in these devices to derive an analytic solution that captures their performance in terms of two dimensionless parameters. The solution explains the reason behind their poor performance, and the dimensionless parameters provide a design criterion for the development of more efficient micro heat pipes. We compare our model with four published micro-heat-pipe experiments, and find encouraging support for our design criteria. We have obtained solutions for square, triangular, hexagonal, and rectangular micro heat pipes. In the second problem, we study the motion of long drops in rectangular microchannels at low capillary numbers. As the drop moves it deposits a thin liquid film on the sidewalls of the microchannel. The drag on the drop comes mainly from the shear force exerted by the wall on the thin films surrounding the drop. The drag is balanced by a liquid pressure difference across the drop. We solve for the drag in the limit of zero capillary number and derive a pressure-flow rate relation. We find encouraging comparison between our model and published experimental results. We have obtained solutions for rectangular microchannels with aspect ratios 1, 1.2, 1.5 and 2, each for different drop to carrier liquid viscosity ratios ranging from 0.001 to 100. In the third problem, we study the boundary layer over a semi-infinite flat plate under forced uniform flow at the leading edge. We derive self-similar solutions, to leading order, for the velocity and pressure fields near the leading edge where the Blasius solution does not apply.

Subjects/Keywords: leading edge; regular-polygonal/rectangular microchannels; two-phase flow; micro heat pipe; contact-line evaporation; Nusselt number; thermal boundary layer; slug flow; contact-line drag; boundary layer; semi-infinite flat plate; pressure-flow rate relation

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APA (6^th Edition):

Rao, S. S. (2015). Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-08212015-014524 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1087

Chicago Manual of Style (16^th Edition):

Rao, Sai Sashankh. “Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels.” 2015. Doctoral Dissertation, Louisiana State University. Accessed January 19, 2021. etd-08212015-014524 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1087.

MLA Handbook (7^th Edition):

Rao, Sai Sashankh. “Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels.” 2015. Web. 19 Jan 2021.

Vancouver:

Rao SS. Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels. [Internet] [Doctoral dissertation]. Louisiana State University; 2015. [cited 2021 Jan 19]. Available from: etd-08212015-014524 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1087.

Council of Science Editors:

Rao SS. Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels. [Doctoral Dissertation]. Louisiana State University; 2015. Available from: etd-08212015-014524 ; https://digitalcommons.lsu.edu/gradschool_dissertations/1087

University of Waterloo

21. Stechlinski, Peter. A Study of Infectious Disease Models with Switching.

Degree: 2009, University of Waterloo

URL: http://hdl.handle.net/10012/4424

► Infectious disease models with switching are constructed and investigated in detail. Modelling infectious diseases as switched systems, which are systems that combine continuous dynamics with… (more)

Subjects/Keywords: epidemiology; infectious diseases; basic reproduction number; threshold criteria; time-dependent contact rate; incidence rate; disease-free solution; persistence; switched systems; hybrid systems

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APA (6^th Edition):

Stechlinski, P. (2009). A Study of Infectious Disease Models with Switching. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/4424

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Stechlinski, Peter. “A Study of Infectious Disease Models with Switching.” 2009. Thesis, University of Waterloo. Accessed January 19, 2021. http://hdl.handle.net/10012/4424.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Stechlinski, Peter. “A Study of Infectious Disease Models with Switching.” 2009. Web. 19 Jan 2021.

Vancouver:

Stechlinski P. A Study of Infectious Disease Models with Switching. [Internet] [Thesis]. University of Waterloo; 2009. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/10012/4424.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Stechlinski P. A Study of Infectious Disease Models with Switching. [Thesis]. University of Waterloo; 2009. Available from: http://hdl.handle.net/10012/4424

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

22. Janousek, William M. Avian Roosting Behavior and Vector-Host Contact Rates for West Nile Virus Hosts.

Degree: Ecology and Evolutionary Biology, 2012, University of California – Santa Cruz

URL: http://www.escholarship.org/uc/item/0gj9861v

► Transmission of vector-borne disease is driven by contact rates between vectors and hosts. However, little is known about what drives fine-scale variation in mosquito host… (more)

Subjects/Keywords: Ecology; avian roosting behavior; Culex; Vector-Host contact rate; West Nile virus

…can increase the probability of contact with an infected host or environment (Johnson… …examined the consequences of host behavior in a vectorborne disease system where contact rates… …The majority of studies exploring the influence of host behavior on vector contact rates are… …behavior on vector contact rates and determine what influence wildlife behavior may have in… …roosting higher in the canopy and/or in larger groups would have higher contact rates with host…

2 more images…

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APA (6^th Edition):

Janousek, W. M. (2012). Avian Roosting Behavior and Vector-Host Contact Rates for West Nile Virus Hosts. (Thesis). University of California – Santa Cruz. Retrieved from http://www.escholarship.org/uc/item/0gj9861v

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Janousek, William M. “Avian Roosting Behavior and Vector-Host Contact Rates for West Nile Virus Hosts.” 2012. Thesis, University of California – Santa Cruz. Accessed January 19, 2021. http://www.escholarship.org/uc/item/0gj9861v.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Janousek, William M. “Avian Roosting Behavior and Vector-Host Contact Rates for West Nile Virus Hosts.” 2012. Web. 19 Jan 2021.

Vancouver:

Janousek WM. Avian Roosting Behavior and Vector-Host Contact Rates for West Nile Virus Hosts. [Internet] [Thesis]. University of California – Santa Cruz; 2012. [cited 2021 Jan 19]. Available from: http://www.escholarship.org/uc/item/0gj9861v.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Janousek WM. Avian Roosting Behavior and Vector-Host Contact Rates for West Nile Virus Hosts. [Thesis]. University of California – Santa Cruz; 2012. Available from: http://www.escholarship.org/uc/item/0gj9861v

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

KTH

23. Hannes, Dave. Growth of cracks at rolling contact fatigue.

Degree: Solid Mechanics (Div.), 2008, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33659

►

Rolling contact fatigue is a problem encountered with many machine elements.In the current report a numerical study has been performed in order to predictthe… (more)

▼

Rolling contact fatigue is a problem encountered with many machine elements.In the current report a numerical study has been performed in order to predictthe crack path and crack propagation cycles of a surface initiated rolling contactfatigue crack. The implementation of the contact problem is based on theasperity point load mechanism for rolling contact fatigue. The practical studiedproblem is gear contact. Different loading types and models are studied andcompared to an experimental spall profile. Good agreement has been observedconsidering short crack lengths with a distributed loading model using normalloads on the asperity and for the cylindrical contact and a tangential load on theasperity. Several different crack propagation criteria have been implemented inorder to verify the validity of the dominant mode I crack propagation assumption.Some general characteristics of rolling contact fatigue cracks have beenhighlighted. A quantitative parameter study of the implemented model hasbeen performed.

Utmattning med rullande kontakter är ett ofta förekommande problem för många maskinelement. I den aktuella rapporten utfördes en numerisk studieför att förutsäga sprickvägen hos utmattningssprickor som initierats i ytan vidrullande kontakter. Implementeringen av kontaktproblemet bygger på asperitpunktlastmekanismen för rullande kontakter. Studien av kontaktproblemetär tillämpad till kugghjul. Olika belastningstyper och modeller studeradesoch jämfördes med profilen hos en experimentell spall. Bra överensstämmelseobserverades för korta spricklängder när en modell med fördelad belastninganvänds för en belastningstyp där en normalbelastning agerar på asperiten ochvid cylindriska kontakten och en tangentialbelastning införs på asperiten. Olikakriterier för spricktillväxt implementerades för att verifiera giltigheten av antagandetatt mode I spricktillväxt är dominant. Några generella kännetecken avutmattningssprickor med rullande kontakter framhävdes. En kvantitativ parameterstudie för den implementerade modellen utfördes.

Subjects/Keywords: rolling contact fatigue; short cracks; crack path determination; crack growth rate; sensitivity study.; Solid mechanics; Fastkroppsmekanik

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APA (6^th Edition):

Hannes, D. (2008). Growth of cracks at rolling contact fatigue. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33659

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hannes, Dave. “Growth of cracks at rolling contact fatigue.” 2008. Thesis, KTH. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33659.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hannes, Dave. “Growth of cracks at rolling contact fatigue.” 2008. Web. 19 Jan 2021.

Vancouver:

Hannes D. Growth of cracks at rolling contact fatigue. [Internet] [Thesis]. KTH; 2008. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33659.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hannes D. Growth of cracks at rolling contact fatigue. [Thesis]. KTH; 2008. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33659

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Rüdrich, Joar. Korrelation mellan markkontakt och totaltid hos svenska sprinterlöpare inom friidrottsgrenen 100 meter.

Degree: Sport and Health Science, 2018, Dalarna University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:du-28138

►

Syfte och frågeställning Syftet med studien är att studera hur svenska elitlöpares totaltider förhåller sig till de olika variablerna markkontakt, flygtid, hastighet, stegfrekvens… (more)

▼

Syfte och frågeställning Syftet med studien är att studera hur svenska elitlöpares totaltider förhåller sig till de olika variablerna markkontakt, flygtid, hastighet, stegfrekvens och steglängd, med största fokus på hur markkontakterna påverkar hastigheten. Studiens två frågeställningar var: (1) Hur ser sambandet ut mellan de fyra variablerna markkontakt, flygtid, steglängd samt stegfrekvens vid den maximala hastigheten vid upprätt löpning hos elitlöpare verksamma inom sprintdistansen 100 meter? (2) Hur korrelerar markkontakt och hastighet hos elitlöpare verksamma inom sprintdistansen 100 meter? Metod En kvantitativ studie genomfördes där 33 manliga och 20 kvinnliga försökslopp på flygande 30 kartlades med mätutrustningen Optojump. Dessa mätvärden analyserades i SPSS för att jämföra korrelation mellan varje mätvärde, ett sambandsdiagram mellan markkontakt och hastighet gjordes samt den översiktliga statistiken analyserades. Resultat Resultaten visar att kortare markkontakter kan ge en högre hastighet, att flygtiden mellan män och kvinnor är lika, att genomsnittet av löparna i studien hade än lägre stegfrekvens och steglängd än litteraturen som presenteras i studien. Slutsatser Resultatet i studien visar att, i likhet med forskningsstudier, att en kortare markkontakt kan ge en höge horisontell löphastighet än en lång. Studien åskådliggör dock att betydligt fler variabler, än endast markkontakt, har stor inverkan på hastighet och totaltid. Jämfört visar detta att mer forskning inom området behövs för att kunna optimera träningsupplägg för löpare.

Purpose and question The purpose of the study is to show how Swedish elit runners total times relate to the different variables ground contact, flight time, speed, step rate and step length, with the main focus on how the ground contacts time affect speed. The study's two main questions were: (1) What is the relationship between the four variables: ground contact, flight time, step length and the velocity at the maximum speed at upright running (2) How do the variable ground contact and velocity correlate between elite runners competing within the track and field event 100 meters? Method A quantitative study was conducted in which 33 male and 20 female runs attempts were mapped with the measuring equipment Optojump. These measured values were analyzed in SPSS to compare correlation between each measurement value, a scatterplot between ground contact and speed, and the summary statistics were taken out. Results The results show that shorter ground contacts times can provide a faster running velocity, that the flight time between men and women is equal, the average of the runners in the study have lower step rate and step…

Subjects/Keywords: ground contact time; step rate; step length; Optojump sprint running; 100-meter dash; track and field; markkontakt; stegfrekvens; steglängd; Optojump; Flygande 30; sprintlöpning; 100 meter; friidrott; Sport and Fitness Sciences; Idrottsvetenskap

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APA (6^th Edition):

Rüdrich, J. (2018). Korrelation mellan markkontakt och totaltid hos svenska sprinterlöpare inom friidrottsgrenen 100 meter. (Thesis). Dalarna University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:du-28138

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rüdrich, Joar. “Korrelation mellan markkontakt och totaltid hos svenska sprinterlöpare inom friidrottsgrenen 100 meter.” 2018. Thesis, Dalarna University. Accessed January 19, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:du-28138.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rüdrich, Joar. “Korrelation mellan markkontakt och totaltid hos svenska sprinterlöpare inom friidrottsgrenen 100 meter.” 2018. Web. 19 Jan 2021.

Vancouver:

Rüdrich J. Korrelation mellan markkontakt och totaltid hos svenska sprinterlöpare inom friidrottsgrenen 100 meter. [Internet] [Thesis]. Dalarna University; 2018. [cited 2021 Jan 19]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:du-28138.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rüdrich J. Korrelation mellan markkontakt och totaltid hos svenska sprinterlöpare inom friidrottsgrenen 100 meter. [Thesis]. Dalarna University; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:du-28138

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. TABASSUMUL HAQUE. Modeling and characterization of abrasive-free copper chemical mechanical planarization process.

Degree: 2005, National University of Singapore

URL: http://scholarbank.nus.edu.sg/handle/10635/14454

Subjects/Keywords: Abrasive-free Copper CMP; Material Removal Mechanism; Material Removal Rate; Within Wafer Non-Uniformity; Non-Prestonian Phenomenon; Modes of Contact

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APA (6^th Edition):

HAQUE, T. (2005). Modeling and characterization of abrasive-free copper chemical mechanical planarization process. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/14454

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

HAQUE, TABASSUMUL. “Modeling and characterization of abrasive-free copper chemical mechanical planarization process.” 2005. Thesis, National University of Singapore. Accessed January 19, 2021. http://scholarbank.nus.edu.sg/handle/10635/14454.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

HAQUE, TABASSUMUL. “Modeling and characterization of abrasive-free copper chemical mechanical planarization process.” 2005. Web. 19 Jan 2021.

Vancouver:

HAQUE T. Modeling and characterization of abrasive-free copper chemical mechanical planarization process. [Internet] [Thesis]. National University of Singapore; 2005. [cited 2021 Jan 19]. Available from: http://scholarbank.nus.edu.sg/handle/10635/14454.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

HAQUE T. Modeling and characterization of abrasive-free copper chemical mechanical planarization process. [Thesis]. National University of Singapore; 2005. Available from: http://scholarbank.nus.edu.sg/handle/10635/14454

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Texas – Austin

26. Rodriguez-Pin, Elena. Grain-scale mechanisms of particle retention in saturated and unsaturated granular materials.

Degree: PhD, Petroleum Engineering, 2010, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2010-12-2537

► The phenomenon of particle retention in granular materials has a wide range of implications. For agricultural operations, these particles can be contaminants transported through the… (more)

▼ The phenomenon of particle retention in granular materials has a wide range of implications. For agricultural operations, these particles can be contaminants transported through the ground that can eventually reach to aquifers, consequently contaminating the water. In oil reservoirs, these particles can be clays that get detached from the rock and migrate with the flow after a change of pressure, plugging the reservoir with the consequent reduction in permeability. These particles can also be traceable nanoparticles, introduced in the reservoir with the purpose of identifying bypassed oil. For all these reasons it is important to understand the mechanisms that contribute to the transport and retention of these particles. In this dissertation the retention of micro and nano size particles was investigated. In saturated model sediments (sphere packs), we analyzed the retention of particles by the mechanism of straining (size exclusion). The analysis focused on experiments reported in the literature in which particles smaller than the smallest pore throats were retained in the sediment. The analysis yields a mechanistic explanation of these observations, by indentifying the retention sites as gaps between pairs of sediment grains. A predictive model was developed that yields a relationship between the straining rate constant and particle size in agreement with the experimental observations. In unsaturated granular materials, the relative contributions of grain surfaces, interfacial areas and contact lines between phases to the retention of colloidal size particles were investigated. An important part of this analysis was the identification and calculation of the length of the contact lines between phases. This estimation of contact line lengths in porous media is the first of its kind. The algorithm developed to compute contact line length yielded values consistent with observations from beads pack and real rocks, which were obtained independently from analysis of high resolution images. Additionally, the predictions of interfacial areas in granular materials were consistent with an established thermodynamic theory of multiphase flow in porous media. Since there is a close relationship between interfacial areas and contact lines this supports the accuracy of the contact line length estimations. Predictions of contact line length and interfacial area in model sediments, combined with experimental values of retention of colloidal size particles in columns of glass beads suggested that it is plausible for interfacial area and contact line to contribute in the same proportion to the retention of particles. The mechanism of retention of surface treated nanoparticles in sedimentary rocks was also investigated, where it was found that retention is reversible and dominated by attractive van der Waals forces between the particles and the rock’s grain surfaces. The intricate combination of factors that affect retention makes the clear identification of the mechanism responsible for trapping a complex task. The work… Advisors/Committee Members: Bryant, Steven L. (advisor), Balhoff, Matthew (committee member), DiCarlo, David (committee member), Huh, Chun (committee member), Lloyd, Douglas R. (committee member).

Subjects/Keywords: Straining; Filtration; Nanoparticles; Colloids; Fluid interfaces; Contact lines; Multiphase flow; Granular materials; Particle retention; Sharma and Yortsos theory; Straining rate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rodriguez-Pin, E. (2010). Grain-scale mechanisms of particle retention in saturated and unsaturated granular materials. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2010-12-2537

Chicago Manual of Style (16^th Edition):

Rodriguez-Pin, Elena. “Grain-scale mechanisms of particle retention in saturated and unsaturated granular materials.” 2010. Doctoral Dissertation, University of Texas – Austin. Accessed January 19, 2021. http://hdl.handle.net/2152/ETD-UT-2010-12-2537.

MLA Handbook (7^th Edition):

Rodriguez-Pin, Elena. “Grain-scale mechanisms of particle retention in saturated and unsaturated granular materials.” 2010. Web. 19 Jan 2021.

Vancouver:

Rodriguez-Pin E. Grain-scale mechanisms of particle retention in saturated and unsaturated granular materials. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2010. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/2152/ETD-UT-2010-12-2537.

Council of Science Editors:

Rodriguez-Pin E. Grain-scale mechanisms of particle retention in saturated and unsaturated granular materials. [Doctoral Dissertation]. University of Texas – Austin; 2010. Available from: http://hdl.handle.net/2152/ETD-UT-2010-12-2537

The Ohio State University

27. Hager, Michele LynnManeca. A Study of Contact Lens Comfort in Patients Wearing Comfilcon A Soft Contact Lenses Compared to Their Habitual Soft Contact Lenses.

Degree: MS, Vision Science, 2009, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1243711014

► Contact lens discomfort, especially contact lens-related ocular dryness, is a major cause of contact lens wear discontinuation. Many studies have evaluated different contact lens materials… (more)

Subjects/Keywords: Ophthalmology; dry eye; comfilcon A; interferometry; lipid layer thickness; pre-lens tear film thinning rate; pre-lens tear film thickness; contact lens dry eye questionnaire

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APA (6^th Edition):

Hager, M. L. (2009). A Study of Contact Lens Comfort in Patients Wearing Comfilcon A Soft Contact Lenses Compared to Their Habitual Soft Contact Lenses. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1243711014

Chicago Manual of Style (16^th Edition):

Hager, Michele LynnManeca. “A Study of Contact Lens Comfort in Patients Wearing Comfilcon A Soft Contact Lenses Compared to Their Habitual Soft Contact Lenses.” 2009. Masters Thesis, The Ohio State University. Accessed January 19, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243711014.

MLA Handbook (7^th Edition):

Hager, Michele LynnManeca. “A Study of Contact Lens Comfort in Patients Wearing Comfilcon A Soft Contact Lenses Compared to Their Habitual Soft Contact Lenses.” 2009. Web. 19 Jan 2021.

Vancouver:

Hager ML. A Study of Contact Lens Comfort in Patients Wearing Comfilcon A Soft Contact Lenses Compared to Their Habitual Soft Contact Lenses. [Internet] [Masters thesis]. The Ohio State University; 2009. [cited 2021 Jan 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1243711014.

Council of Science Editors:

Hager ML. A Study of Contact Lens Comfort in Patients Wearing Comfilcon A Soft Contact Lenses Compared to Their Habitual Soft Contact Lenses. [Masters Thesis]. The Ohio State University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1243711014

University of Queensland

28. Ejtemaei, Majid. Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite.

Degree: School of Chemical Engineering, 2017, University of Queensland

URL: http://espace.library.uq.edu.au/view/UQ:576998

Subjects/Keywords: Sphalerite; Pyrite; Copper activation; Collector; Adsorption kinetics; Cryo-XPS; Zeta potential (zeta); Hydrophobicity; Drainage rate; Contact angle; 030603 Colloid and Surface Chemistry; 0904 Chemical Engineering; 0914 Resources Engineering and Extractive Metallurgy

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APA (6^th Edition):

Ejtemaei, M. (2017). Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite. (Thesis). University of Queensland. Retrieved from http://espace.library.uq.edu.au/view/UQ:576998

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ejtemaei, Majid. “Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite.” 2017. Thesis, University of Queensland. Accessed January 19, 2021. http://espace.library.uq.edu.au/view/UQ:576998.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ejtemaei, Majid. “Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite.” 2017. Web. 19 Jan 2021.

Vancouver:

Ejtemaei M. Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite. [Internet] [Thesis]. University of Queensland; 2017. [cited 2021 Jan 19]. Available from: http://espace.library.uq.edu.au/view/UQ:576998.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ejtemaei M. Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite. [Thesis]. University of Queensland; 2017. Available from: http://espace.library.uq.edu.au/view/UQ:576998

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

29. Ahmed, H. S. Tanvir. Use of Dynamic Test Methods to Reveal Mechanical Properties of Nanomaterials.

Degree: Mechanical Engineering, 2010, Texas Tech University

URL: http://hdl.handle.net/2346/ETD-TTU-2010-12-1029

► Dynamic indentation techniques like micro and nanoscratch compared to static nanoindentation offer more robust extraction of mechanical properties of thin films, with higher level of… (more)

Subjects/Keywords: Dynamic test method; Tensile test; Interrupted tensile test; Micro-scratch test; Nano-scratch test; Strain rate sensitivity; Tapping mode frequency shift; Modulus measurement; Thin films; Hertzian contact

…significant loading rate range. The fourth chapter is to provide the details of the underlying… …at a wide range of strain rate. Considering the potential of this technique, detailed… …foils shows a different rate sensitivity exponent at higher strain rate, suggesting a… …to provide a base line for comparison of strain rate sensitivity as well as possible… …tested to reveal strength and strain rate sensitivity. In addition, a new technique known as…

10 more images…

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APA (6^th Edition):

Ahmed, H. S. T. (2010). Use of Dynamic Test Methods to Reveal Mechanical Properties of Nanomaterials. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/ETD-TTU-2010-12-1029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ahmed, H S Tanvir. “Use of Dynamic Test Methods to Reveal Mechanical Properties of Nanomaterials.” 2010. Thesis, Texas Tech University. Accessed January 19, 2021. http://hdl.handle.net/2346/ETD-TTU-2010-12-1029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ahmed, H S Tanvir. “Use of Dynamic Test Methods to Reveal Mechanical Properties of Nanomaterials.” 2010. Web. 19 Jan 2021.

Vancouver:

Ahmed HST. Use of Dynamic Test Methods to Reveal Mechanical Properties of Nanomaterials. [Internet] [Thesis]. Texas Tech University; 2010. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/2346/ETD-TTU-2010-12-1029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ahmed HST. Use of Dynamic Test Methods to Reveal Mechanical Properties of Nanomaterials. [Thesis]. Texas Tech University; 2010. Available from: http://hdl.handle.net/2346/ETD-TTU-2010-12-1029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cincinnati

30. Yang, Chunping. Rotating Drum Biofiltration.

Degree: PhD, Engineering : Environmental Engineering, 2004, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752

► Biofiltration has developed into a promising technology for the abatement of volatile organic compounds (VOCs), odors, and hazardous air pollutants in waste gas streams. Many… (more)

▼ Biofiltration has developed into a promising technology for the abatement of volatile organic compounds (VOCs), odors, and hazardous air pollutants in waste gas streams. Many factors, however, are still creating an environment for greater innovation as well as new products for biofiltration processes. Rotating drum biofilters (RDBs) are such an innovation. The objectives of this investigation are to develop and understand RDBs and consequently to design and operate RDBs properly. Three RDBs, a single-layer RDB, a multi-layer RDB, and a hybrid RDB, were developed and evaluated at various design and operation conditions in this investigation. Spongy medium that was used to support the biofilms was mounted on a cylindrical drum frame that was rotated at a preset speed. Diethyl ether, toluene, and hexane were chosen as the model VOC. Results showed that the RDBs were readily started up and removed VOCs with high water solubility and a low value of Henry' constant efficiently with more than 6 month duration without any biomass control measures. The single-layer and hybrid RDBs usually reach the lowest and highest VOC removal efficiency. VOC removal efficiency decreased with increased VOC loading rate and decreased gas empty contact time (EBCT). Nitrate in the liquid phase of the RDBs can be rate-limiting for diethyl ether removal. With increased drum rotating speed, the change in VOC removal efficiency depends on VOC properties, VOC loading rate, drum rotating speed value, and biofilter configurations. The microbial community structure along medium depth are almost identical for each of the RDBs , however, the structure changes with the operation conditions and biofilter configuration. Review of the biomass accumulation rates among different layers reveals four biomass accumulation patterns which represent different removal mechanisms: surface biofiltration, in-depth biofiltration, shallow biofiltration, and reverse biofiltration. The dominant biomass accumulation pattern in an RDB can be predicted and can, to a certain extent, be controlled. Mechanism-based procedures for biofilter design and operation are consequently proposed. The outcome of this research is critical for understanding the rotating drum biofiltration, properly designing and operating RDBs, and consequently rendering RDBs cost-effective for the control of VOC emissions. Advisors/Committee Members: Suidan, Dr. Makram (Advisor).

Subjects/Keywords: Engineering, Environmental; biodegradation; biofilm; biofilter; biofiltration; biomass; design; DGGE; empty bed contact time; foam medium; microbial community structure; nitrate; operation; organic loading rate; PCR; removal mechanism; rotating drum biofilter; rotating speed

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APA (6^th Edition):

Yang, C. (2004). Rotating Drum Biofiltration. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752

Chicago Manual of Style (16^th Edition):

Yang, Chunping. “Rotating Drum Biofiltration.” 2004. Doctoral Dissertation, University of Cincinnati. Accessed January 19, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752.

MLA Handbook (7^th Edition):

Yang, Chunping. “Rotating Drum Biofiltration.” 2004. Web. 19 Jan 2021.

Vancouver:

Yang C. Rotating Drum Biofiltration. [Internet] [Doctoral dissertation]. University of Cincinnati; 2004. [cited 2021 Jan 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752.

Council of Science Editors:

Yang C. Rotating Drum Biofiltration. [Doctoral Dissertation]. University of Cincinnati; 2004. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092668752

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