| 1. |
- Ericson, F, et al.
(författare)
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High-sensitivity surface micromachined structures for internal stress and stress gradient evaluation
- 1997
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Ingår i: JOURNAL OF MICROMECHANICS AND MICROENGINEERING. - : IOP PUBLISHING LTD. - 0960-1317. ; 7:1, s. 30-36
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The internal stress and stress gradient of thick (10 mu m) and thin (2 mu m) polysilicon films were evaluated with surface micromachined test structures. The structure that measured internal stress consisted of actuator beams rotating an indicator through
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| 2. |
- Ericson, Per G P, 1956-, et al.
(författare)
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Subspecific identity of prehistoric Baltic cormorants Phalacrocorax carbo
- 1997
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Ingår i: Ardea. - 0373-2266 .- 2213-1175. ; 85:1, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- Cormorants of the subspecies Phalacrocorax carbo sinensis breed in large numbers in the Baltic Sea. They migrate to the Mediterranean region to winter and are then replaced in the Baltic by wintering individuals of the Norwegian population of the nominate subspecies carbo. Cormorants bred in the Baltic during prehistoric times too, but as evident from a comparison of skeletal measurements in present-day and prehistoric Cormorants, these individuals belonged to the nominate subspecies carbo. The Swedish subfossil record of the Cormorants available for study, does not include any remains small enough to suggest the presence of sinensis. Precisely when the subspecies sinensis immigrated into the Baltic is unknown, but it must have occurred sometime between 1500 and 1800 AD.
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| 5. |
- Jensen-Urstad, K, et al.
(författare)
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Heart rate variability in healthy subjects is related to age and gender.
- 1997
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Ingår i: Acta Physiologica Scandinavica. - 0001-6772 .- 1365-201X. ; 160:3, s. 235-41
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Tidskriftsartikel (refereegranskat)abstract
- The effects of age and gender on heart rate variability as measured by spectral and time domain analysis of 24 h ECG recordings were evaluated in 101 healthy subjects, 49 men and 52 women (20-69 years of age). In the frequency domain, total power, very low-frequency power, low-frequency power and high-frequency power were negatively correlated to age (P < 0.001 for all variables). Total power decreased by 30% between 20-29 and 60-69 years of age. In the time domain, SDNN-index, the mean of the standard deviations of all normal R-R intervals for all 5 min segments of a 24 h ECG recording, was negatively correlated to age (P < 0.001). Total power, very low-frequency power, low-frequency power and the low-frequency/high-frequency ratio were lower in women (P < 0.05, P < 0.05, P < 0.01 and P < 0.01), although the absolute differences were much smaller than for age. There was a pronounced circadian variation; at night total power increased in all age groups (P < 0.01). The results show that age, and to a lesser degree gender, are important determinants of heart rate variability in healthy subjects. Heart rate variability is a valuable tool for risk stratification in cardiovascular disease, but the physiological effects of ageing, with diminishing heart rate variability in older age groups, must also be taken into account.
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| 7. |
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| 8. |
- Schweitz, JA, et al.
(författare)
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Evaluation of mechanical materials properties by means of surface micromachined structures
- 1999
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Ingår i: SENSORS AND ACTUATORS A-PHYSICAL. - : ELSEVIER SCIENCE SA. - 0924-4247. ; 74:1-3, s. 126-133
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- For all micromechanical devices, mechanical properties such as elasticity constants, internal stresses, fracture limits and, for ductile materials, yield limits and strain-hardening behaviour, are of paramount importance in design and use. Furthermore, me
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