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Search Results: 1 - 10 of 406172 matches for " M Wilson "
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Monitoring the Sequelae of Coronary Microembolization on Myocardium Using Noninvasive Imaging (Review)  [PDF]
M. Saeed, M. W. Wilson
World Journal of Cardiovascular Diseases (WJCD) , 2014, DOI: 10.4236/wjcd.2014.412073
Abstract: Acute myocardial infarction (AMI) is a leading cause of death worldwide. It has been clinically classified into 1) ischemic from a primary coronary event (e.g., plaque rupture or thrombotic occlusion), 2) ischemic from a supply-and-demand mismatch and c) ischemic from a percutaneous coronary interventions (PCI). Catheter-based PCI has been frequently used as an alternative to conventional bypass surgery for patients at high risk. However, this method of treatment is associated with microvascular obstruction (MVO) by dislodged microemboli that results in left ventricular (LV) dysfunction/remodeling, perfusion deficits, microinfarction and arrhythmia. The contributions of microemboli after revascularization of AMI have been acknowledged by major cardiac and interventional societies. Recent studies showed that Emboli Detection and Classification (EDAC) Quantifier offers increased sensitivity and capability for detecting dislodged coronary microemboli during PCI. Coronary microembolization can be detected directly by monitoring intra-myocardial contrast opacification on contrast echocardiography, increasing F-18 fluorodeoxyglucose (FDG) uptake on positron emission tomography, loss/diminution of signal on first pass perfusion and hypoenhanced zone on contrast enhanced magnetic resonance imaging (MRI) and multidetector computed tomography (MDCT) and indirectly by ST-segment elevation on electro-cardiography (ECG). The relations between volumes/sizes of microemboli, visibility of microinfarct, myocardial perfusion and LV function are still under intensive discussions. Non-invasive imaging can play important role in assessing these parameters. This review shed the light on the techniques used for detecting coronary microemboli, microvascular obstruction and microinfarct and the short- and long-term effects of microemboli on LV function, structure and perfusion.
Pneumothorax as a predatory goal for the sabertooth cat (Smilodon fatalis)  [PDF]
Ted Wilson, Dirk E. Wilson, Jill M. Zimanske
Open Journal of Animal Sciences (OJAS) , 2013, DOI: 10.4236/ojas.2013.31006
Abstract:

Smilodon fatalis was a large extinct felid distinguished by their two impressive maxillary canines and surprisingly low canine fracture rates. Previous theories regarding their attack strategy have suggested delivering damage by a bite with their maxillary canines. It has also been previously suggested that the canines could have been used to deliver a non-biting stab with an open jaw. It has been generally hypothesized that the attack was delivered to the neck of their large herbivore prey. Smilodon fatalis could have used their canines in a non-biting stab delivered with a closed jaw for the sole purpose of creating a pneumothorax. Creation of a pneumothorax would maximize immediate attack lethality, and minimize exposure of its canines to fracture.

Psychology Students’ Beliefs about Integrating Complementary and Alternative Therapy (CAT) into Their Future Psychology Practice  [PDF]
Lee-Ann M. Wilson, Kyra Hamilton, Katherine M. White
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.32029
Abstract: We investigated whether belief-based differences exist between students who have strong and weak intentions to integrate complementary and alternative therapy (CAT) into future psychology practice by recommending CAT or specific CAT practitioners to clients. A cross-sectional methodology was used. Psychology undergraduate students (N = 106) participated in a paper-based questionnaire design to explore their underlying beliefs related to CAT integration. The study was undertaken at a major university in Queensland, Australia. The theory of planned behaviour belief-based framework guided the study. Multivariate analyses of variance examined the influence of behavioural, normative, and control beliefs on the strong and weak intention groups. A multiple regression analysis investigated the relative importance of these belief sets for predicting intentions. We found that clear differences emerged between strong and weak intenders on behavioural and normative beliefs, but not control beliefs. Strong intenders perceived the positive outcomes of integrating CAT, such as being able to offer clients a more holistic practice and having confidence in the practitioners/practices, as more likely to occur than weak intenders, and perceived the negative outcome of compromising my professional practice as less likely. Strong intenders were more likely than weak intenders to perceive that a range of important referents (e.g., clients) would think they should integrate CAT. Results of the regression analysis revealed the same pattern of results in that behavioural and normative beliefs, but not control beliefs, significantly predicted intentions. The findings from this study can be used to inform policy and educational initiatives that aim to encourage CAT use in psychology practice.
The feasibility of introducing solar ovens to rural women in Maphephethe
M Wilson, JM Green
Journal of Family Ecology and Consumer Sciences /Tydskrif vir Gesinsekologie en Verbruikerswetenskappe , 2000,
Abstract: Vorige navorsing het bewys dat die potensiaal vir die bemagtiging van baie landelike vroue in ‘n beter manier van beide kook en die versameling van brandhout lê. Die vele huishoudelike pligte van vroue kan so verlig word. ‘n Sonkookprojek is na aanleiding van hierdie bevinding in Maphephethe, ‘n landelike gemeenskap omtrent 80 km wes van Durban, ge nisieer. Die doel met die projek was drievoudig: om die sonoondtegnologie in die gebied bekend te stel, om ‘n kookprofiel op te stel ten einde die geskiktheid van sonkookmetodes vir die plaaslike omstandighede te bepaal, en om die mense te leer hoe om eenvoudige, goedkoop sonoonde te bou. Formele vraelyste, fokusgroepe en informele gesprekke is gebruik om die data in te samel en om die nuwe tegnologie aan die gemeenskap bekend te stel. Die resultate dui daarop dat sonkook in Maphephethe moontlik is, alhoewel sekere aspekte aandag moet geniet en die tegnologie daarvolgens aangepas moet word. Die geslagstereotipes wat aan tegnologieoordrag verbonde is, is bespreek, en ‘n pad vorentoe is aangewys om die tegnologie meer aanvaarbaar te maak.
University access for social justice: a capabilities perspective
M Wilson-Strydom
South African Journal of Education , 2011,
Abstract: The closely related, but often contradictory, issues of increasing access to university and improving students’ chances of success in their university studies have been and continue to be an important research focus within higher education studies and policy in South Africa and beyond. More recently, the challenge of underpreparedness of students entering university has gained prominence as universities struggle to increase their throughput rates. It can be argued that increasing access, without increasing chances of success, is becoming a new form of social exclusion within higher education. This paper proposes that approaching issues of access from a capabilities perspective (as developed by Amartya Sen) provides a means of fostering access for social justice and countering access that leads to social exclusion. As such, this is a theoretical paper building on existing work on the capabilities approach within education to argue that the notion of capabilities provides a useful theoretical and conceptual framework for understanding the complexities of meaningful access to university in a deeply divided society like South Africa.
Institutional Reform and Rights Revolutions in Latin America: The Cases of Costa Rica and Colombia Reforma institucional y revoluciones de derechos en América Latina. Los casos de Costa Rica y Colombia
Bruce M. Wilson
Journal of Politics in Latin America , 2009,
Abstract: This article analyzes the conditions that allowed for expansive rights revolutions in Costa Rica and Colombia. My research suggests that many of the preconditions for rights revolutions in other regions of the world are also central to understanding Latin American cases. Of particular relevance is judicial system design including the high courts’ operating rules concerning access, standing, and judicial formality. These factors can and do mitigate the need for extensive resources and support structures necessary in other non-Latin American countries in which rights revolutions have occurred. Este artículo analiza las condiciones que facilitaron el surgimientode revoluciones para promover los derechos en Costa Rica y Colombia.Mi investigación sugiere que muchas de las precondiciones para lasrevoluciones de derechos en otras regiones del mundo también son centralespara entender los casos latinoamericanos. De particular relevancia es eldise o del sistema judicial, incluyendo las reglas de funcionamiento los detribunales supremos con respecto a acceso, rango y formalidad judicial.Estos factores pueden disminuir la necesidad de recursos extensivos yestructuras de apoyo necesarios en otros paises no latinoamericanos en loscuales revoluciones de derechos han ocurrido.
Some geometry and combinatorics for the S-invariant of ternary cubics
P. M. H. Wilson
Mathematics , 2004,
Abstract: Given a real cubic form f(x,y,z), there is a pseudo-Riemannian metric given by its Hessian matrix, defined on the open subset of R^3 where the Hessian determinant h is non-zero. We determine the full curvature tensor of this metric in terms of h and the S-invariant of f, obtaining in the process various different characterizations of S. Motivated by the case of intersection forms associated with complete intersection threefolds in the product of three projective spaces, we then study ternary cubic forms which arise as follows: we choose positive integers d1, d2, d3, set r = d1 + d2 + d3 - 3, and consider the coefficient F(x,y,z) of H1^d1 H2^d2 H3^d3 in the product (x H1 + y H2 + z H3)^3 (a_1 H1 + b_1 H2 + c_1 H3) ... (a_r H1 + b_r H2 + c_r H3), the a_j, b_j and c_j denoting non-negative real numbers; we assume also that F is non-degenerate. Previous work of the author on sectional curvatures of Kahler moduli suggests a number of combinatorial conjectures concerning the invariants of F. It is proved here for instance that the Hessian determinant, considered as a polynomial in x,y,z and the a_j, b_j, c_j, has only positive coefficients. The same property is also conjectured to hold for the S-invariant; the evidence and background to this conjecture is explained in detail in the paper.
Sectional curvatures of Kahler moduli
P. M. H. Wilson
Mathematics , 2003,
Abstract: We investigate a new property for compact Kahler manifolds. Let X be a Kahler manifold of dimension n and let H^{1,1} denote the (1,1) part of its real second cohomology. On this space, we have an degree n form given by cup product. Let K denote the open cone of Kahler classes in H^{1,1}, and K_1 the level set consisting of classes in K on which the n-form takes value one. This is a Riemannian manifold, with tangent space at a given point being the primitive classes of type (1,1), and metric defined via the Hodge Index Theorem. In the Calabi-Yau case (and probably more generally), we conjecture that K_1 has non-positive sectional curvatures. This would place new restrictions on the possible location of the Kahler cone in cohomology, giving potentially useful information as to which differentiable manifolds may support Calabi-Yau structures. The conjecture is motivated by a Mirror Symmetry argument in Section 1. This argument suggests that one should develop a mirror version of the Weil-Petersson theory of complex moduli. The outline of such a theory is described in Sections 2-4, and the conjecture is verified under certain extra assumptions. In Section 5, we investigate in more detail the case when X is a Kahler threefold with h^{1,1} = 3, where we only have one sectional curvature on K_1 to consider. We prove a formula (5.1) relating this curvature to the classical invariants of the ternary cubic form, and we discuss various implications of this formula.
Flops, Type III contractions and Gromov-Witten invariants on Calabi-Yau threefolds
P. M. H. Wilson
Mathematics , 1997,
Abstract: We investigate Gromov-Witten invariants associated to exceptional classes for primitive birational contractions on a Calabi-Yau threefold X. It was observed in a previous paper that these invariants are locally defined, in that they can be calculated from knowledge of an open neighbourhood of the exceptional locus of the contraction; in this paper, we make this explicit. For Type I contractions (i.e. only finitely many exceptional curves), a method is given for calculating the Gromov-Witten invariants, and these in turn yield explicit expressions for the changes in the cubic form $D^3$ and the linear form $D.c_2$ under the corresponding flop. For Type III contractions (when a divisor E is contracted to a smooth curve C of singularities), there are only two relevant Gromov-Witten numbers n(1) and n(2). Here n(2) is the number (suitably defined) of simple pseudo-holomorphic rational curves representing the class of a fibre of E over C, and n(1) the number of simple curves representing half this class. Explicit formulae for n(1) and n(2) are given (n(1) in terms of the singular fibres of E over C and n(2)=2g(C)-2). An easy proof of these formulae is provided when g(C)>0. The main part of the paper then gives a proof valid in general (including the case g(C)=0).
Symplectic Deformations of Calabi-Yau threefolds
P. M. H. Wilson
Mathematics , 1997,
Abstract: This manuscript from August 1995 (revised February 1996) studies the Kaehler cone of Calabi-Yau threefolds via symplectic methods. For instance, it is shown that if two Calabi-Yau threefolds are general in complex moduli and are symplectic deformations of each other, then their Kaehler cones are the same. The results are generalizations of those in the author's previous paper "The Kaehler cone on Calabi-Yau threefolds" (Inventiones math. 107 (1992), 561-583; Erratum: Inventiones math. 114 (1993), 231-233), where the behaviour of the Kaehler cone under deformations of the complex structure was studied -- these results may be recovered as a special case from this manuscript. The techniques used involve studying tamed almost complex deformations of the complex structure on the Calabi-Yau threefold, and in particular proving the non-vanishing of certain Gromov-Witten invariants, associated to codimension one faces of the Kaehler cone. This in turn involves a detailed study of primitive contractions on a smooth Calabi-Yau threefold, in particular for the case of Type III contractions. More detailed information concerning Gromov-Witten invariants associated to codimension one faces of the Kaehler cone may be found in a recent preprint of the author.
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