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Passive magnetic shielding in static gradient fields
Get PDFThe effect of passive magnetic shielding on dc magnetic field gradients imposed by both external and internal sources is studied for two idealized shield models: concentric spherical and infinitely-long cylindrical shells of linear material. It is found that higher-order multipoles of an externally applied magnetic field are always shielded progressively better for either geometry by a factor related to the order of the multipole. In regard to the design of internal coil systems, we determine reaction factors for the general multipole field and provide examples of how one can take advantage of the coupling of the coils to the innermost shell to optimize the uniformity of the field. Furthermore, we provide formulae relevant to active magnetic compensation systems which attempt to stabilize the interior fields by sensing and cancelling the exterior fields close to the outermost shell. Overall this work provides a comprehensive framework that is useful for the analysis and optimization of dc magnetic shields, serving as a theoretical and conceptual design guide as well as a starting point and benchmark for finite-element analysis."We gratefully acknowledge the support of the Natural Sciences and Engineering Research
Council of Canada."https://aip.scitation.org/doi/10.1063/1.487371
http://www.downtownwinnipegtrends.com/
Get PDFThe Downtown BIZ authored the final report and website. As the website is no longer active, a PDF version of the report is temporarily availableThe Downtown BIZ authored the final report and website. As the website is no longer active, a PDF version of the report is temporarily availabl
Combinatorics and Algorithmics of Strings
Get PDFEdited in cooperation with Robert MercaşStrings (aka sequences or words) form the most basic and natural data structure. They occur whenever information is electronically transmitted (as bit streams), when natural language text is spoken or written down (as words over, for example, the Latin alphabet), in the process of heredity transmission in living cells (through DNA sequences) or the protein synthesis (as sequence of amino acids), and in many more different contexts. Given this universal form of representing information, the need to process strings is apparent and is actually a core purpose of computer use. Algorithms to efficiently search through, analyze, (de-)compress, match, encode and decode strings are therefore of chief interest. Combinatorial problems about strings lie at the core of such algorithmic questions. Many such combinatorial problems are common in the string processing efforts in the different fields of application.http://drops.dagstuhl.de/opus/volltexte/2014/4552
'I Would Like the Girls at Home': Domestic Labor and the Age of Discharge at Canadian Indian Residential Schools
Get PDFRepublished by permission of the editors.Survivors of Canadian Indian residential schools and their descendants will often recall discharge from the schools occurring at the age of either sixteen or eighteen. In fact the discharge of students from residential schools at the ages of sixteen or eighteen was a significant point of contention both for parents and other relatives of students as well as for school officials. This chapter examines the struggle over age of discharge between 1920 and 1940 through the lens of correspondence between parents and other family members, the Department of Indian Affairs (DIA) and school staff about the return of female pupils. Parents and other relatives of the students initiated the exchange, requesting that pupils nearing or past the age of sixteen be returned to them hecause they were needed at home. In response, school staff wanting to retain students to the age of eighteen and beyond insisted that female students needed the further domestic training, moral uplift and protection offered by the schools so that they could be 'fitted' to undertake employment as domestic servants upon discharge. In fact it was often the need of the schools for the domestic labor of female students that was the real concern. On both sides of the issue, gender mattered and the struggle illuminates the importance of young Indigenous women to both economies of colonization and to Indigenous communities
From faith to food: using oral history to study corporate mythology in Canadian manufacturing firms
Get PDFThe study of corporate mythology, particularly through oral history, has received increasing attention from business historians. The role of corporate mythology is examined at two Canadian manufacturing companies: Loewen (a wooden window manufacturer in Steinbach, Manitoba) and WT Hawkins (makers of Cheezies, a cheese-flavoured snack made from extruded corn). Oral histories and Roland Barthes’ writings on mythology are used to study an advertising campaign at Loewen, while corporate records and oral histories are used to explore Hawkins’ corporate mythology. The author concludes that corporate mythology succeeded at Hawkins but failed at Loewen: Hawkins built a following for a single product made using outdated equipment, while Loewen reduced its workforce and was sold to a foreign holding company.https://www.jstor.org/stable/2434296
Extremal words in morphic subshifts
Get PDFGiven an infinite word x over an alphabet A, a letter b occurring in
x, and a total order \sigma on A, we call the smallest word with respect to \sigma
starting with b in the shift orbit closure of x an extremal word of x. In this
paper we consider the extremal words of morphic words. If x = g(f^\omega(a))
for some morphisms f and g, we give two simple conditions on f and
g that guarantees that all extremal words are morphic. This happens,
in particular, when x is a primitive morphic or a binary pure morphic
word. Our techniques provide characterizations of the extremal words of
the Period-doubling word and the Chacon word and give a new proof of
the form of the lexicographically least word in the shift orbit closure of
the Rudin-Shapiro word.www.sciencedirect.com/science/article/pii/S0012365X1400006
Abelian complexity of fixed point of morphism 0 ↦ 012, 1 ↦ 02, 2 ↦ 1
Get PDFWe study the combinatorics of vtm, a variant of the Thue-Morse word generated by the non-uniform morphism 0 ↦ 012, 1 ↦ 02, 2 ↦ 1 starting with 0. This infinite ternary sequence appears a lot in the literature and finds applications in several fields such as combinatorics on words; for example, in pattern avoidance it is often used to construct infinite words avoiding given patterns. It has been shown that the factor complexity of vtm, i.e., the number of factors of length n, is Θ(n); in fact, it is bounded by ¹⁰⁄₃n for all n, and it reaches that bound precisely when n can be written as 3 times a power of 2. In this paper, we show that the abelian complexity of vtm, i.e., the number of Parikh vectors of length n, is O(log n) with constant approaching ¾ (assuming base 2 logarithm), and it is Ω(1) with constant 3 (and these are the best possible bounds). We also prove some results regarding factor indices in vtm."F. Blanchet-Sadri and Nathan Fox’s research was supported by the National Science Foundation under Grant No. DMS–1060775."
"James D. Currie and Narad Rampersad’s research was supported by NSERC Discovery grants.
Commercialization of biodiversity: markets for genetic resources and biochemical products
No full textExploring Drumming/Song and its Relationship to Healing in the Lives of Indigenous Women Living in the City of Winnipeg
Get PDFThis is an exploratory study on drumming/song and its relationship to healing in the lives of Indigenous women living in the City of Winnipeg. The participants of this study included urban-based Indigenous women actively involved in drumming and song. An Indigenous research framework was employed using the drum as methodology in exploring and understanding Indigenous ways of knowing and being. The researcher used Indigenous searching methods (“talking circles” and the “Anishinaabe-Symbol Based Reflection” activity) to gather the women’s personal stories as they related to the topic of the study. The women identified the healing benefits of drumming/song from a holistic perspective, meaning emotional, mental, physical, and a central focus on the spiritual dimension. The outcome of the study demonstrates that Dewe-i-gan (drum) provides a holistic healing approach within the lives of the women based on Indigenous ways of seeing, understanding, and being in the world that extends beyond the mere act of drumming."I would like to express my sincere gratitude and appreciation to the Department of Indigenous Studies and the Faculty of Graduate Studies at the University of Winnipeg for their generous financial support."Master of Arts in Indigenous Governanc