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- Yip, G. W., et al.
(author)
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Left ventricular long-axis changes in early diastole and systole : impact of systolic function on diastole
- 2002
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In: Clinical Science. - 0143-5221 .- 1470-8736. ; 102:5, s. 515-522
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Journal article (peer-reviewed)abstract
- Impaired long-axis motion is a sensitive marker of systolic myocardial dysfunction, but no data are available that relate long-axis changes in systole with those in diastole, particularly in subjects with diastolic dysfunction and a 'normal' left ventricular (LV) ejection fraction. A total of 311 subjects (including 105 normal healthy volunteers) aged 20-89 years with variable degrees of systolic function (LV ejection fraction range 0.15-0.84) and diastolic function were studied using tissue Doppler echocardiography and M-mode echocardiography to determine mean mitral annular amplitude and peak velocity in systole and early and late diastole. The LV systolic mitral annular amplitude (S-LAX, where LAX is long-axis amplitude) and peak velocity (S-m) correlated well with the respective early diastolic components (E-LAX and E-m) and late diastolic (atrial) components (A(LAX) and A(m)). A non-linear equation fitted better than a linear relationship (non-linear model: S-LAX against E-LAX, r(2) = 0.67; S-m against E-m, r(2) = 0,60; S-LAX against A(LAX) and S-m against A(m), r(2) = 0.42), After adjusting for age, sex and heart rate, linear relationships of early diastolic (E-LAX, r(2) = 0.70; E-m, r(2) = 0.60) and late diastolic (A(LAX), r(2) = 0.61; A(m), r(2) = 0.64) long-axis amplitudes and velocities with the respective values for S-LAX and S-m were found, even in those subjects with apparently 'isolated' diastolic dysfunction. Long-axis changes in systole or diastole did not correlate with Doppler mitral velocities. We conclude that ventricular long-axis changes in early diastole are closely related to systolic function, even in subjects with diastolic dysfunction. 'Pure' or isolated diastolic dysfunction is uncommon.
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- Kahn, Joel S., et al.
(author)
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Anthropology and Modernity1/Comments/Reply
- 2001
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In: Current Anthropology. ; 42:5
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Journal article (peer-reviewed)abstract
- Â Against those who have taken anthropologists to task for flirting with the "meta-narratives" of modernity, this article argues that it is incumbent on them to engage with both modernity and modernist narratives far more directly and explicitly than in the past. This holds even, or especially, for those who, in positing a notion of multiple modernities, have managed to hold modernist narrative at arm’s length, neglecting the potential fruitfulness of juxtaposing Western and non-Western experiences of what Habermas has called the project of modernity. The encounter between anthropology and modernity is generated on the one hand by changes in the lives of the subjects of ethnographic research, but the fact of these changes raises more searching questions about whether ethnographers ever studied genuinely premodern peoples and cultures. The reflexive imperative, moreover, confirms the need to recognize anthropology’s own modernist origins. Finally it is argued that it is critical modernist theory in the Hegel-Marx-Weber tradition that is the most pertinent to the ethnographic encounter and that the exercise of bringing together critical theory and ethnographic knowledge, while conflictual, produces fruitful results for both sides. [PUBLICATION ABSTRACT]
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- Powell, John, et al.
(author)
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Laser cutting stainless steel with dual focus lenses
- 2000
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In: Journal of laser applications. - : Laser Institute of America. - 1042-346X .- 1938-1387. ; 12:6, s. 224-231
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Journal article (peer-reviewed)abstract
- In this article the performance of a new type of lens is compared with traditional meniscus lenses for CO sub 2 laser cutting of medium ( > 5 mm) section stainless steel. Dual Focus lenses produce two focus spots, one above the other. This type of optic was found to be capable of higher cutting speeds and better quality cuts. A phenomenological model is presented which explains the superior performance of Dual Focus lenses. The model concentrates upon the fact that during high speed cutting of medium section metals, the laser does not irradiate the lower portion of the cut zone. This lower part of the cut is heated by the melt flowing over it, which has been previously heated by the laser. This melt preheating involves narrower kerfs and higher cut speeds if a dual focus lens is used.
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