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1. Continuous synthesis of high-entropy alloy nanoparticles by in-flight alloying of elemental metals

Author

Keun Su Kim, Martin Couillard, Ziqi Tang, Homin Shin, Daniel Poitras, Changjun Cheng, Olga Naboka, Dean Ruth, Mark Plunkett, Lixin Chen, Liliana Gaburici, Thomas Lacelle, Michel Nganbe, and Yu Zou

Subjects
Science
Abstract

Abstract High-entropy alloy (HEA) nanoparticles (NPs) exhibit unusual combinations of functional properties. However, their scalable synthesis remains a significant challenge requiring extreme fabrication conditions. Metal salts are often employed as precursors because of their low decomposition temperatures, yet contain potential impurities. Here, we propose an ultrafast ( 5000 K) is employed for rapid heating/cooling (103 − 105 K s−1), and demonstrates the synthesis of CrFeCoNiMo HEA NPs ( ~ 50 nm) at a high rate approaching 35 g h−1 with a conversion efficiency of 42%. Our thermofluid simulation reveals that the properties of HEA NPs can be tailored by the plasma gas which affects the thermal history of NPs. The HEA NPs demonstrate an excellent light absorption of > 96% over a wide spectrum, representing great potential for photothermal conversion of solar energy at large scales. Our work shows that the thermal plasma process developed could provide a promising route towards industrial scale production of HEA NPs.

Published
2024
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3. Ethical-Clinical Tensions in Clinical Practice.

Author

Dean, Ruth Grossman and Rhodes, Margaret L.

Abstract

Focuses on boundaries clinicians draw between ethical and clinical responses in their work. Focuses particularly on psychodynamic practice in presenting three clinical vignettes. Vignettes highlight worker responses to one client's stealing and feelings of entitlement about it, another client's racism, and another's sexual abuse by previous therapist. Recommends that ethical deliberation be more explicit focus of treatment. (Author/NB)

Published
1992

5. Memoirs of Fellows and Corresponding Fellows of the Medieval Academy of America

Author

Boyle, Leonard F., Dean, Ruth J., Meyvaert, Paul, Rouse, Richard H., Bloomfield, Morton W., Brault, Gerard J., Roach, William J., Brentano, Robert, Kristeller, Paul O., Davis, Charles T., Courtenay, William J., Setton, Kenneth M., Strayer, Joseph R., Thorne, Samuel E., and Cuttino, George

Published
1987

6. Memoirs of Fellows and Corresponding Fellows of the Medieval Academy of America

Author

Courtenay, William J., Cranz, F. Edward, Rosenthal, Franz, Benson, Robert L., Marti, Berthe, Bisson, T. N., Benson, Larry D., Kane, George, Robinson, Fred C., Boyle, Leonard, Tierney, Brian, Kuttner, Stephan, Hanning, Robert, Pope, John, Thorne, Samuel, Baldwin, John W., Andersson, Theodore M., Lewis, Archibald R., Pelikan, Jaroslav, Herlihy, David, Leyerle, John, Fisher, John H., Dean, Ruth J., Roach, William J., Wenzel, Siegfried, Lewis, Archibald L., Lyon, Bryce, Cuttino, G. P., Benton, John F., Clagett, Marshall, Rouse, Richard H., and Grant, Edward

Published
1988

7. Memoirs of Fellows and Corresponding Fellows of the Medieval Academy of America

Author

Meyvaert, Paul, Whiting, B. J., Benson, Larry D., Lewis, Archibald R., Baldwin, John W., Bloomfield, Morton, Brentano, Robert, Herlihy, David, Courtenay, William J., Bisson, Thomas N., Bishko, C. J., Dean, Ruth J., Rouse, Richard H., Kaske, Robert E., Springer, Otto, and Andersson, Theodore M.

Published
1985

8. Memoirs of Fellows and Corresponding Fellows of the Medieval Academy of America

Author

Cranz, F. Edward, Dean, Ruth J., Lumiansky, Robert M., Kristeller, Paul Oskar, Rosenthal, Franz, Setton, Kenneth M., Strayer, Joseph R., Lopez, Robert S., Grant, Edward, Gabriel, Astrik L., Robinson, Fred C., Courtenay, William J., Howard, Donald R., Kaske, Robert E., Ferrante, Joan M., Goffart, Walter, Meyvaert, Paul, and Constable, Giles

Published
1986

13. Memoirs of Fellows and Corresponding Fellows of the Medieval Academy of America

Author

Lumiansky, Robert M., Roach, William J., Wenzel, Siegfried, Bloomfield, Morton W., Leyerle, John F., Kane, George, Kristeller, Paul O., Meyvaert, Paul, Boyle, Leonard E., Kibre, Pearl, Strayer, Joseph R., White,, Lynn, Rouse, Richard H., Gabriel, Astrik L., Dean, Ruth J., Benson, Larry D., Cranz, F. Edward, Whiting, B. J., Raftis, J. Ambrose, Shook, L. K., and Leyerle, John

Published
1982

30. Synthesis of high quality single-walled carbon nanotubes with purity enhancement and diameter control by liquid precursor Ar–H2 plasma spraying

Author

Keun Su Kim, Benoit Simard, Dean Ruth, Christopher T. Kingston, and Michael L. Barnes

Subjects
Materials science, General Chemical Engineering, Nanotechnology, Carbon nanotube, Induction plasma, Liquid precursors, Raw material, Feedstocks, Industrial and Manufacturing Engineering, law.invention, chemistry.chemical_compound, Single-walled carbon nanotubes (SWCN), law, Etching (microfabrication), Environmental Chemistry, Thermal spraying, Diameter control, Organometallics, Amorphous carbon, Liquids, Plasma spraying, General Chemistry, Plasma, Large scale synthesis, Toluene, chemistry, Ferrocene, Plasmas, Mixtures, Scientific method, Process control, Single-walled carbon nanotube (SWCNTs), Diameter distributions, Scientific researches, Induction thermal plasma
Abstract

As usage of carbon nanotubes continues to increase in both scientific research and practical applications, there has been a growing interest in the large-scale synthesis of those materials with high quality and high purity. Here we report a new plasma process developed for the large-scale synthesis of high quality single-walled carbon nanotubes (SWCNTs). An induction thermal plasma with a liquid precursor spraying technique was employed for an effective synthesis of SWCNTs from a mixture of toluene and ferrocene. It has been successfully demonstrated in this new process that high quality SWCNTs can be synthesized continuously with a reasonably high-purity, the structural quality of the materials produced being comparable to those of SWCNTs produced from the laser vaporization process. The high temperature of the plasma, over 4000 K, seems to be responsible for the production of high quality SWCNTs and the rapid treatment of a large amount of feedstock, whereas the hydrogen plasma contributes to the purity enhancement by selective etching of amorphous carbon. It is also found that the diameter distribution of SWCNTs can be controlled effectively by varying the sulfur content in the feedstock mixture, which is very promising for many advanced applications of SWCNTs such as SWCNT-based electronics.

Published
2014
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31. Psychodynamic Practice and Single System Design: The Odd Couple.

Author

Dean, Ruth Grossman and Reinherz, Helen

Abstract

Single subject design, recommended as applicable with any theoretical or practice perspective, is most often associated with behavioral techniques and task-centered strategies. The course described demonstrates the successful utilization of this method with students trained in psychodynamic treatment approaches. (Author/MH)

Published
1986

32. Exploring Epistemologies: Social Work Action as a Reflection of Philosophical Assumptions.

Author

Dean, Ruth G. and Fenby, Barbara L.

Abstract

Two major philosophical assumptions underlying the literature, practice, and teaching of social work are reviewed: empiricism and existentialism. Two newer theoretical positions, critical theory and deconstruction, are also introduced. The implications for using each position as a context for teaching are considered. (MSE)

Published
1989

46. A qualitative study on African immigrant and refugee families' experiences of accessing primary health care services in Manitoba, Canada: it's not easy!

Author

Woodgate, Roberta Lynn, Busolo, David Shiyokha, Crockett, Maryanne, Dean, Ruth Anne, Amaladas, Miriam R., and Plourde, Pierre J.

Subjects
ACCULTURATION, HEALTH services accessibility, HEALTH status indicators, PSYCHOLOGY of immigrants, INTERVIEWING, MEDICAL quality control, MEDICAL care costs, PRIMARY health care, PSYCHOLOGY of refugees, QUALITATIVE research, SOCIAL support, THEMATIC analysis, HEALTH & social status, PSYCHOLOGY
Abstract

Background: Immigrant and refugee families form a growing proportion of the Canadian population and experience barriers in accessing primary health care services. The aim of this study was to examine the experiences of access to primary health care by African immigrant and refugee families. Methods: Eighty-three families originating from 15 African countries took part in multiple open ended interviews in western Canada. Qualitative data was collected in six different languages between 2013 and 2015. Data analysis involved delineating units of meaning from the data, clustering units of meaning to form thematic statements, and extracting themes. Results: African immigrant and refugee families experienced challenges in their quest to access primary health care that were represented by three themes: Expectations not quite met, facing a new life, and let's buddy up to improve access. On the theme of expectations not quite met, families struggled to understand and become familiar with a new health system that presented with a number of barriers including lengthy wait times, a shortage of health care providers, high cost of medication and non-basic health care, and less than ideal care. On the theme of facing a new life, immigrant and refugee families talked of the difficulties of getting used to their new and unfamiliar environments and the barriers that impact their access to health care services. They talked of challenges related to transportation, weather, employment, language and cultural differences, and lack of social support in their quest to access health care services. Additionally, families expressed their lack of social support in accessing care. Privately sponsored families and families with children experienced even less social support. Importantly, in the theme of let's buddy up to improve access, families recommended utilizing networking approaches to engage and improve their access to primary health care services. Conclusions: African immigrant and refugee families experience barriers to accessing primary health care. To improve access, culturally relevant programs, collaborative networking approaches, and policies that focus on addressing social determinants of health are needed. [ABSTRACT FROM AUTHOR]

Published
2017
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