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University of Notre Dame

Sergey B Leonov

DrSc, PhD, Prof.

Dr. Sergey Leonov, PhD, Dr.Sc., Professor at the University of Notre Dame. He received his PhD from The Baltic State University in 1990, and a senior Doctor of Science degree from the Russian Academy of Sciences in 2006. He worked in research and higher education institutions in Moscow, Russia, including Joint Institute for High Temperature of the Russian Academy of Sciences where he was a Head of Department, and, concurrently, Moscow Open University where he was a Professor. In 2013-2014, he was a Visiting Professor at the Ohio State University, USA. Currently, he is a Full Research Professor at the Universit of Notre Dame. His research interests and contributions are primarily in the areas of Plasma Physics, Fluid Dynamics, Plasma Aerodynamics, Plasma-Assisted Combustion, Supersonics/Hypersonics and Measuring/Experimental Techniques. His research activity over the last 35 years has included experimental work, analytical predictions, physical interpretation of data, as well as close involvement in numerical simulations. He has over 400 publications, including 80+ peer-reviewed journal papers in these specific and other related fields. Dr. Leonov is an Associate Fellow of AIAA and an IEEE Senior Member, AIAA Plasmadynamics and Lasers Technical Committee Member, Coordinator of Plasma Aerodynamics Discussion Group, EUCASS Flow Physics Technical Committee Member, FLUCOME Honorary Member, Section Editor-in-Chief at Aerospace J. (mpdi) and Technical Physics Letters, etc.

Charan Ranganath

Position Title Professor

• 530-757-8750
• [email protected]
• http://dml.ucdavis.edu/
• Ph.D., Clinical Psychology, Northwestern University
• M.S., Clinical Psychology, Northwestern University
• B.A., Psychology, University of California, Berkeley

In addition to his academic appointment in Psychology, Charan Ranganath is an affiliated faculty with the UC Davis Center for Neuroscience, which seeks to understand the function of the human brain in health and in illness. He is also director of the Dynamic Memory Lab at UC Davis and is an affiliated faculty with the Center for Mind and Brain. His research involves the use of functional neuroimaging, electrophysiology and behavioral methods to study the neural basis of human memory and executive control. He previously served as editor for the Cognitive Neuroscience Section of the journal NeuroImage , and currently serves as an editor for the Journal of Neuroscience , which is the most influential academically edited journal in the field of neuroscience. Professor Ranganath has consulted for government and private funding agencies from several countries and has served on review panels for the National Institutes of Health and National Science Foundation.

Research Focus

Professor Ranganath's research concerns the neurocognitive structure of human memory and executive control. One set of studies currently underway concerns the relationship between short-term, or working memory, and long-term memory. Results from event-related fMRI studies conducted by Professor Ranganath suggest that overlapping regions of the prefrontal cortex and medial temporal lobes are active during both working memory and long-term memory tasks. This research suggests that a common neural system supports both of these types of memory. Currently, Professor Ranganath is investigating how different regions within the prefrontal cortex and medial temporal lobes contribute to working and long-term memory through additional fMRI studies of healthy young adults and behavioral testing of patients with focal brain damage. A second, related area of interest is the role of prefrontal cortex in the control and evaluation of information in memory. Finally, in collaboration with Andy Yonelinas, Professor Ranganath is investigating the roles of different medial temporal lobe regions in recognition memory processes. To address this issue, he is conducting parallel studies using event-related fMRI and event-related brain potentials in healthy young and older adults and amnesic patients with medial temporal lobe damage. In collaboration with another research group, he is also conducting studies to examine field potentials recorded directly from the human hippocampal formation in patients performing recognition memory tasks.

Publications

• Hsieh, L. T., Gruber, M. J., Jenkins, L. J. , & Ranganath, C. (2014). Hippocampal activity patterns carry information about objects in temporal context. Neuron. 81(5):1165-78. PMID: 24607234
• Gruber, M. J., Gelman, B. , & Ranganath, C. (2014). States of curiosity modulate hippocampus-dependent learning via the mesolimbic dopaminergic circuit. Neuron. 84(2): 486-496. PMID: 25284006
• Ranganath, C., & Ritchey, M. (2012). Two cortical systems for memory guided behaviour. Nature Reviews Neuroscience , 13: 713-726. PMID: 22992647
• Addante, R. J., Watrous, A. C. , Yonelinas, A. P. , Ekstrom, A. D. , & Ranganath, C. (2011). Pre-stimulus theta oscillations predict source memory retrieval. Proceedings of the National Academy of Sciences , 108(26):10702-7.
• Axmacher, N., Cohen, M. S. , Fell, J. , Haupt, S. , Elger, C. E., Schlaepfer, T. E., Lenartz, D. , Sturm, V. , & Ranganath, C. (2010). Intracranial EEG correlates of expectancy and memory formation in the human hippocampus and nucleus accumbens. Neuron , 65, 541‚Äì549.

Professor Ranganath has taught courses in Human Learning, Fundamentals of Cognitive Neuroimaging and Current Research in Psychology.

Professor Ranganath’s work has been recognized with several awards, including a Guggenheim Fellowship, Leverhulme Trust Visiting Professorship at the University of Cambridge, the Laird Cermak Award from the Memory Disorders Research Society, the Samuel Sutton Award for Distinguished Scientific Contribution to Human ERPs and Cognition, the Chancellor’s Fellow award from UC Davis, and the Young Investigator Award from the Cognitive Neuroscience Society. In 2015, he was one of 11 researchers in the United States to receive a National Security Science and Engineering Faculty Fellowship. His research has been funded by grants from the Department of Defense, the National Institute of Mental Health (NIMH) and several private foundations.

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Feature Stories 2024: Nursing PhD Alumni Series: Dr. Rayna Letourneau, PhD '17, RN

Trailblazer in nursing workforce development

Dr. Rayna Letourneau, a 2017 graduate of UMass Dartmouth's College of Nursing & Health Sciences PhD program, is an experienced nurse educator and a trailblazer in nursing workforce development.

She previously taught at UMass Dartmouth and is now an assistant professor at the University of South Florida School of Nursing while also serving as executive director for the Florida Center for Nursing. Letourneau highlights how her PhD education has allowed for the expansion and success of her current work, shared the projects she has initiated that have had a national and global impact, and offers helpful advice for those considering pursuing a PhD in nursing.

Realizing the scope of one's impact

UMass Dartmouth's PhD program in nursing prepares graduates to become successful nurse educators and scientists. Letourneau notes that the potential opportunities for graduates of this program are far-reaching. During her time as a PhD student, Letourneau recognized the impact that nursing education has on workforce development and the nursing workforce. She stated that her nursing PhD "poised me to be able to do all of the work that I do now for the Florida Center for Nursing, the scholarship related to nursing workforce development, and continue in the role of teaching."

In speaking about her program of research, Letourneau stated, "Being prepared as a teacher and a nurse educator has allowed me to recognize what the needs are for workforce development. What is the need for recruitment, what does a pipeline look like, and what type of resources need to be implemented and utilized to be able to have an appropriate, robust pipeline of nurses into our workforce?

"And it doesn't stop there. Once we’ve established that pipeline and we put people through our nursing education programs, whether that's prelicensure or post-licensure, what are the resources they need to transition to their new role? After we prepare them and transition them into the workforce, our work is not done. We need to continue to support them, we need to continue to develop them, we need to encourage healthy work environments, and determine what systematic changes need to happen to be able to retain our nursing workforce and those experts, and then help those experts give back to the new nurses coming in."

Creative initiatives for nurses and PhD students 

Letourneau’s work has focused on The Future of Nursing 2020-2030 report. "If the goal is to increase capacity and competence of the nursing workforce, the projects that I work on align with that goal," she said.

One project she created is the Frontline Nursing program, a continuing education program with the goal of increasing the capacity and competence of frontline nurses caring for COVID-19 patients during the pandemic. This program reached an international audience and offered continuing education units (CEUs). In recalling the importance of this work, Letourneau said there was a focus on "the unique needs for nurses to be able to continue to flourish in their role at the bedside, how to advocate for themselves, and how to be empowered."

Additionally, in 2021, Letourneau founded WIRES (Wellness, Innovation, Resources, Education, and Support) for the Healthcare Workforce. "The purpose of WIRES is focused on the recruitment, retention, and the wellbeing of the workforce, starting with nurses but able to transcend our work to all of the healthcare professions," she stated. 

She highlighted one of the program’s major successes, their Preceptorship-to-Hire program. "We partner with hospitals in our region to purposely place our senior-level, final semester preceptorship students with a preceptor in a hospital system in which the student wants to work post-graduation. Looking at this program, it's a purposeful match because we know that teaching and learning is a bidirectional process: the learner, the student, has needs and the preceptor has needs too, so we’re looking at how we can make that a good match," she said. Letourneau shared that the end goal is to decrease one-year turnover rates at these organizations.

Reflecting on these initiatives, Letourneau emphasized how her PhD education helped her be part of the solutions for problems related to workforce development. She noted that nurse scientists have a duty to enact these solutions. "We can’t stop at just making some recommendations or developing strategic plans; implementing those strategies and testing them to see what’s effective and then being able to scale them nationally and globally will help make an impact."

Recommendations for pursuing a PhD

Letourneau offers valuable advice for current and future PhD students: "Find a mentor who can help you determine your goals and the best path to meet those goals."

Regarding her choice to pursue her PhD, Letourneau states, "I recommend it 100%. I am so glad that I was able to participate in the PhD program at UMass Dartmouth because it really did meet my career goals. The programmatic outcomes, the faculty—everything aligned with what I want to do."

Editors Note: The Nursing PhD Alumni Series will feature interviews with graduates from UMass Dartmouth's PhD program and exemplifies a vast array of opportunities one can pursue with a nursing PhD education.

This story was written by Danielle DeGonge, a PhD student in the College of Nursing & Health Sciences.

"I am so glad that I was able to participate in the PhD program at UMass Dartmouth because it really did meet my career goals. The programmatic outcomes, the faculty—everything aligned with what I want to do." Dr. Rayna Letourneau, PhD '17

Related features

May 28, 2024 Nursing PhD Alumni Series: Dr. Rayna Letourneau, PhD '17, RN

May 23, 2024 Shawn Koohy '24: Opportunities in research

May 20, 2024 William Tuttle '24: Mentor, football player, and future nurse

May 20, 2024 Jessica Kittel PhD '24: Diving into discovery

May 13, 2024 Jacqueline Ramirez '24: On the fast track

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Tapping Into The Power Of Sunlight And Practical Tips On Reducing Junk Light From Your Life With Alexis Cowan, PhD Dhru Purohit Show

• Alternative Health

This episode is brought to you by Lumebox and AquaTru. Numerous experts have explored the myriad factors associated with chronic disease. However, our guest today sheds light on an often overlooked factor: junk light. Our modern lifestyles frequently experience diminished exposure to natural sunlight and constant exposure to blue light emitted by phones, devices, and indoor workspaces. Dr. Alexis Cowan emphasizes the importance of minimizing our exposure to junk light and maximizing sunlight for our health. Today on The Dhru Purohit Show, Dhru sits down with Dr. Alexis Cowan to discuss the impact of junk light on our well-being and longevity. Dr. Cowan explains how exposure to junk light can alter our circadian rhythm and hormone levels, disrupting our sleep patterns and eating behaviors. Additionally, she underscores the significance of sunlight exposure for weight management, mood regulation, and daily motivation. Dr. Cowan offers practical tips to minimize blue light exposure and incorporate red light therapy for those unable to attain optimal sun exposure in their daily routines. Dr. Alexis Cowan is a Princeton-trained PhD in molecular biology who operates at the interface of physiology and metabolism. She specializes in circadian biology, microbiome-host interactions, and the metabolic effects of nutritional and exercise modalities. Dr. Alexis teaches coursework on topics in health, translational science, and scientific literacy. She also sees highly motivated clients in a one-on-one capacity.  In this episode, Dhru and Dr. Cowan dive into (audio version / Apple Subscriber version): Junk light as a contributor to chronic disease (00:00:05 / 00:00:05) The implications of having too much junk light (8:00 / 6:37) What does the absence of sunlight and too much junk light cause (12:00 /10:05) How much sun should you get a day and build up your tolerance (16:00 / 14:20) Skin cancer risks (21:50 / 20:05) What damages skin and causes aging (25:00 / 23:19) The correlation between melanoma and skin cancer (31:30 / 28:50) Metabolism, weight loss, and sunlight exposure (38:40 / 33:30) Simple hacks to reduce your blue light exposure (39:20 / 36:05) Red light therapy (44:20 / 41:03) Dr. Cowan’s journey (47:00 / 43:54) Akkermansia for gut health and immunity (51:40 / 48:30) Sunlight and motivation and goals (1:00:00 / 53:52) Final thoughts (1:01:30 / 58:00) Also mentioned in this episode: Dr. Cowan’s Podcast, Undoctrinate Yourself  Study on LASIK surgery  Melanoma Exposure Study Study about high occupational sun exposure seemed to be inversely associated with melanoma Sun exposure is associated with increased survival from melanoma Study about low UV exposure and Vitamin D levels related to increased mortality due to skin cancer Study about the positive association between melanoma risk and intermittent sun exposure in contrast to reduced risk with high levels of occupational exposure  For more on Dr. Alexis Cowan, follow her on Instagram and via her site. Lumebox is offering my community $260 off their FDA-approved portable Red Light device! That's over 40% off! Go to thelumebox.com/dhru and get your Red Light device. AquaTru is a countertop reverse osmosis purifier with a four-stage filtration system that removes 15x more contaminants than the bestselling water filters out there. Go to dhrupurohit.com/filter/ and get $100 off when you try AquaTru for yourself. Learn more about your ad choices. Visit megaphone.fm/adchoices

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