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107. A Tensor Dirac Equation in Curved Space

Author

Nikolay Marchuk, Accardi, L., Adenier, G., Fuchs, Ca, Jaeger, G., Khrennikov, A., Larsson, Ja, and Stenholm, S.

Subjects
Mathematical analysis, Dirac algebra, Tetrad formalism, General Relativity and Quantum Cosmology, symbols.namesake, Dirac equation, symbols, Two-body Dirac equations, Mathematics::Differential Geometry, Dirac sea, Curved space, Klein–Gordon equation, Computer Science::Databases, Mathematical physics, Causal fermion system, Mathematics
Abstract

We suggest a tensor equation on Riemannian manifolds which can be considered as a generalization of the Dirac equation for the electron. The tetrad formalism is not used.

Published
2009
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116. From Physics to Philosophy

Author

Stenholm, S.

Subjects
From Physics to Philosophy (Book), Books -- Book reviews, Physics
Published
2000

117. Does the amount of fat mass predict age-related loss of lean mass, muscle strength, and muscle quality in older adults?

Author

Koster, A, Ding, J, Stenholm, S, Caserotti, P, Houston, DK, Nicklas, BJ, You, T, Lee, JS, Visser, M, Newman, AB, Schwartz, AV, Cauley, JA, Tylavsky, FA, Goodpaster, BH, Kritchevsky, SB, Harris, TB, Koster, A, Ding, J, Stenholm, S, Caserotti, P, Houston, DK, Nicklas, BJ, You, T, Lee, JS, Visser, M, Newman, AB, Schwartz, AV, Cauley, JA, Tylavsky, FA, Goodpaster, BH, Kritchevsky, SB, and Harris, TB

Abstract

Background. An excessive amount of adipose tissue may contribute to sarcopenia and may be one mechanism underlying accelerated loss of muscle mass and strength with aging. We therefore examined the association of baseline total body fat with changes in leg lean mass, muscle strength, and muscle quality over 7 years of follow-up and whether this link was explained by adipocytokines and insulin resistance. Methods. Data were from 2,307 men and women, aged 70-79 years, participating in the Health, Aging, and Body Composition study. Total fat mass was acquired from dual energy X-ray absorptiometry. Leg lean mass was assessed by dual energy X-ray absorptiometry in Years 1, 2, 3, 4, 5, 6, and 8. Knee extension strength was measured by isokinetic dynamometer in Years 1, 2, 4, 6, and 8. Muscle quality was calculated as muscle strength divided by leg lean mass. Results. Every SD greater fat mass was related to 1.3 kg more leg lean mass at baseline in men and 1.5 kg in women (p < .01). Greater fat mass was also associated with a greater decline in leg lean mass in both men and women (0.02 kg/year, p < .01), which was not explained by higher levels of adipocytokines and insulin resistance. Larger fat mass was related to significantly greater muscle strength but significantly lower muscle quality at baseline (p < .01). No significant differences in decline of muscle strength and quality were found. Conclusions. High fatness was associated with lower muscle quality, and it predicts accelerated loss of lean mass. Prevention of greater fatness in old age may decrease the loss of lean mass and maintain muscle quality and thereby reducing disability and mobility impairments. © The Author 2011. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved.

Published
2011

130. Physics and Chance

Author

Stenholm, S.

Subjects
Physics and Chance (Book) -- Book reviews, Books -- Book reviews, Physics
Published
1994

141. Effect of a participatory ergonomics intervention on psychosocial factors at work in a randomised controlled trial

Author

Haukka, E., primary, Pehkonen, I., additional, Leino-Arjas, P., additional, Viikari-Juntura, E., additional, Takala, E.-P., additional, Malmivaara, A., additional, Hopsu, L., additional, Mutanen, P., additional, Ketola, R., additional, Virtanen, T., additional, Holtari-Leino, M., additional, Nykanen, J., additional, Stenholm, S., additional, Ojajarvi, A., additional, and Riihimaki, H., additional

Published
2009
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148. Semiclassical theory of a high-intensity laser.

Author

Lamb, W. E., Jr and Stenholm, S

Subjects
Masers
Abstract

Lamb theory of Doppler broadened gas laser extended to arbitrary intensities for single mode operation, calculating detuning curves and inversion densities

Published
1969

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