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Search Results: 1 - 10 of 303 matches for " Schofield "
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Analysis and Comparison of Power Electronic Converters for Conventional and Toroidal Switched Reluctance Machines  [PDF]
Zipan Nie, Nigel Schofield
Energy and Power Engineering (EPE) , 2017, DOI: 10.4236/epe.2017.94017
Abstract: Different power electronic converter topologies are introduced in this paper for both Conventional Switched Reluctance Machine (CSRM) and Toroidal Switched Reluctance Machine (TSRM) drive systems. Their commutation, switch and diode currents, power losses, and efficiencies under over modulation operation are analyzed and compared for converter characteristics study, performance evaluation and topology selection for CSRM and TSRM drive systems. The switch and diode silicon volumes required for each CSRM and TSRM drives are also compared according to their corresponding currents at the equivalent machine torque versus speed operating points.
Trypanosoma cruzi -- the vector-parasite paradox
Schofield, CJ;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000400016
Abstract: trypanosoma cruzi and the majority of its insect vectors (hemiptera, reduviidae, triatominae) are confined to the americas. but while recent molecular studies indicate a relatively ancient origin for the parasite (~65 million years ago) there is increasing evidence that the blood-sucking triatomine vectors have evolved comparatively recently (<5 mya). this review examines the evidence for these ideas, and attempts to reconcile the apparent paradox by suggesting that marsupial opossums (didelphidae) may have played a role, not just as original reservoir hosts, but also as original vectors of the parasite.
On the Phenomenon of Inserted Thoughts: A Critique of Shaun Gallagher’s Neurophenomenological Account of Thought Insertion
Steve Schofield
Indo-Pacific Journal of Phenomenology , 2006,
Abstract: This paper explores the phenomenon of thought insertion, an experience reported by some schizophrenics where it is believed that other persons or forces are inserting thoughts into their minds. This relatively circumscribed symptom of schizophrenia raises difficult questions concerning our sense of agency for our thoughts. How is it possible that persons can think that their thoughts are not their own? Gallagher, drawing on Husserl’s early work on timeconsciousness, provides a subtle and sophisticated answer to this problem, suggesting that protention may underlie our sense of agency for thinking and that the experience of inserted thoughts may occur in the event of an intermittent failure in this protentional function. More recent Husserl scholarship suggests, however, that this account may face problems on phenomenological grounds. It is argued here that our sense of agency for thinking requires more than protention, and, consequently, that the absence of protention cannot fully explain the loss of agency for thinking characterizing the experience of thought insertion. In order to contextualize this discussion of the phenomenon theoretically and, in the process, to provide an introduction to the difficulties in explaining it, this paper proceeds with a consideration of Frith’s early cognitive account of thought insertion and the contribution of Stephens and Graham in this regard. In conclusion, it is argued that, despite the merits of all three accounts presented, they remain unable to account for the phenomenon of inserted thoughts, and that we might more fruitfully understand this experience as bein a type of uncontrollable passive or autochthonous thinking. Indo-Pacific Journal of Phenomenology, Volume 6, Edition 2 August 2006
Utility and Democracy: A Comment on the Commentators
Philip Schofield
Philosophy and Public Issues , 2011,
Abstract:
Utility and Democracy: Summary
Philip Schofield
Philosophy and Public Issues , 2011,
Abstract:
Whither History of Women in the Americas?
Ann Schofield
History of Women in the Americas , 2013, DOI: http://journals.sas.ac.uk/hwa/article/view/1690
Abstract: This article charts conceptual developments in the field of history of women in the Americas over the past forty years since the author began her career. It compares women’s and gender history and the contributions of key figures such as Joan Scott, Alice Kessler-Harris, and Barbara Welter along with recent developments in the field such as the history of women in the Atlantic world. The article also proposes reasons for the separation of American women’s history into North American, Latin American, and Caribbean fields.
Trypanosoma cruzi the vector-parasite paradox
Schofield CJ
Memórias do Instituto Oswaldo Cruz , 2000,
Abstract: Trypanosoma cruzi and the majority of its insect vectors (Hemiptera, Reduviidae, Triatominae) are confined to the Americas. But while recent molecular studies indicate a relatively ancient origin for the parasite (~65 million years ago) there is increasing evidence that the blood-sucking triatomine vectors have evolved comparatively recently (<5 mya). This review examines the evidence for these ideas, and attempts to reconcile the apparent paradox by suggesting that marsupial opossums (Didelphidae) may have played a role, not just as original reservoir hosts, but also as original vectors of the parasite.
Is the Political Economy Stable or Chaotic?
Norman Schofield
AUCO Czech Economic Review , 2011,
Abstract: Recent events in the global economy have caused many writers to argue that the market is driven by animal spirits, by irrational exuberance or speculation. At the same time, the economic downturn has apparently caused many voters in the United States, and other countries, to change their opinion about the the proper role of government. Unfortunately, there does not exist a general equilibrium model of the political economy, combining a formal model of the existence, and convergence to a price equilibrium, as well as an equilibrium model of political choice. One impediment to such a theory is the so-called chaos theorem which suggests that existence of a political equilibrium is non-generic. This paper surveys results in the theory of dynamical systems, emphasizing the role of structural stability and chaos. We consider models of celestial mechanics where the notion of chaos first developed, and then examine applications in models of climate change and economics. There is discussion of the past influences of climate on human society, and particularly how agriculture developed during the “holocene,” the past ten thousand years of benign climate. The recent period of globalization is likened to the holocene, and the question is raised whether future climate change may bring economic and political chaos.
Universal localisations of hereditary rings
Aidan Schofield
Mathematics , 2007,
Abstract: We describe all possible universal localisations of a hereditary ring in terms of suitable full subcategories of the category of finitely presented modules. For these universal localisations we then identify the category of finitely presented bound modules over the universal localisation as being equivalent to a certain full subcategory of the category of finitely presented bound modules over the original ring. We also describe the abelian monoid of finitely generated projective modules over the universal localisation.
Severe right Ore sets and universal localisation
Aidan Schofield
Mathematics , 2007,
Abstract: We introduce the notion of a severe right Ore set in the main as a tool to study universal localisations of rings but also to provide a short proof of P. M. Cohn's classification of homomorphisms from a ring to a division ring. We prove that the category of finitely presented modules over a universal localisation is equivalent to a localisation at a severe right Ore set of the category of finitely presented modules over the original ring. This allows us to describe the structure of finitely presented modules over the universal localisation as modules over the original ring.
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