| 1. |
- Gruen, E., et al.
(författare)
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Ulysses Dust Detection System V3.1
- 2010
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Ingår i: NASA Planetary Data System. ; 140
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Tidskriftsartikel (refereegranskat)abstract
- This data set contains the data from the Ulysses dust detector system (UDDS) from start of mission through the end of mission, 1990-2007. (As the dust detector was turned off after Nov. 30, 2007, this is the last date for which UDDS data is recorded.) Included are the dust impact data, noise data, laboratory calibration data, and location and orientation of the spacecraft and instrument.
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| 2. |
- Grun, E., et al.
(författare)
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South-North and Radial Traverses through the Interplanetary Dust Cloud
- 1997
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Ingår i: Icarus. - : Elsevier BV. - 0019-1035. ; 129:2, s. 270-288
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Tidskriftsartikel (refereegranskat)abstract
- Identical in situ dust detectors are flown on board the Galileo and Ulysses spacecraft. They record impacts of micrometeoroids in the ecliptic plane at heliocentric distances from 0.7 to 5.4 AU and in a plane almost perpendicular to the ecliptic from -79 deg to +79 deg ecliptic latitude. The combination of both Ulysses and Galileo measurements yields information about the radial and latitudinal distributions of micron- and sub-micron-sized dust in the Solar System. Two types of dust particles were found to dominate the dust flux in interplanetary space. Interplanetary micrometeoroids covering a wide mass range from 10^-16 to 10^-6 g are recorded mostly inside 3 AU and at latitudes below 30 deg. Interstellar grains with masses between 10^-14 and 10^-12 g have been positively identified outside 3 AU near the ecliptic plane and outside 1.8 AU at high ecliptic latitudes (>50 deg). Interstellar grains move on hyperbolic trajectories through the planetary system and constitute the dominant dust flux (1.5 x 10^-4 m^-2 sec^-1) in the outer Solar System and at high ecliptic latitudes. To compare and analyze the Galileo and Ulysses data sets, a new model is developed based on J. Geophys. Res. 98, 17029-17048, Divine's (1993, ``five populations of interplanetary meteoroids'' model. Both models describe the interplanetary meteoroid environment in terms of dust populations on distinct orbits. Taking into account the measured velocities and the effect of radiation pressure on small particles (described by the ratio of radiation pressure force to gravity, beta), we define four populations of meteoroids on elliptical orbits and one population on hyperbolic orbit that can fit the micrometeoroid flux observed by Galileo and Ulysses. Micrometeoroids with masses greater than 10^-10 g and negligible radiation pressure (beta = 0) orbit the Sun on low to moderately eccentric orbits and with low inclinations (<=30 deg). Populations of smaller particles with mean masses of 10^-11 g (beta = 0.3), 10^-13 g (beta = 0.8), and 5 x 10^-15 g (beta = 0.3), respectively, have components with high eccentricities and have increasingly wider inclination distributions with decreasing mass. Similarities among the orbit distributions of the small particle populations on bound orbits suggest that all are genetically related and are part of an overall micrometeoroid complex that prevails in the inner Solar System. The high-eccentricity component of the small particle populations may actually be beta-meteoroids which are not well characterized by our measurements. Our modeling suggests further that the interstellar dust flux is not reduced at Ulysses' perihelion distance (1.3 AU) and that it contributes about 30% of the total dust flux observed there.
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| 3. |
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| 4. |
- Darin, Niklas, 1964, et al.
(författare)
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Changes in prevalence, aetiology, age at detection, and associated disabilities in preschool children with hearing impairment born in Göteborg.
- 1997
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Ingår i: Developmental medicine and child neurology. - : Wiley. - 0012-1622 .- 1469-8749. ; 39:12, s. 797-802
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Tidskriftsartikel (refereegranskat)abstract
- The prevalence of hearing impairment (HI) in preschool children born in Göteborg in 1980 to 1984 was 2.0 per 1000. This was significantly lower than the 3.8 per 1000 found in a previous study for 1970 to 1974. The decrease took place in the moderate to severe range of HI, while deafness and mild HI remained unchanged during the period. The cause was considered to be prenatal in 58% with heredity in 33% as the main causative factor. Following the introduction of the MPR (Morbilli-Parotitis-Rubella) vaccination programme in Sweden, no cases of rubella- or mumps-induced HI could be found. The number of HI of perinatal origin decreased by half, in spite of the fact that the figures for preterm baby survival almost doubled during the period. Associated disabilities were diagnosed in 62% of the children with HI; speech retardation in 33%, visual abnormalities in 30%, mental retardation in 12% and neuropsychiatric disorders in 9% of the cases. The importance of collaborative efforts between the otolaryngologist and the neurologically and neuropsychiatrically interested paediatrician in the complete evaluation of additional difficulties in the HI child is emphasized.
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| 5. |
- Engervall, K, et al.
(författare)
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Borreliosis as a cause of peripheral facial palsy: a multi-center study
- 1995
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Ingår i: ORL. - 0301-1569. ; 57:4, s. 202-206
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Tidskriftsartikel (refereegranskat)abstract
- Borreliosis is known to be a common cause of peripheral facial palsy in Stockholm and its vicinity. The aim of the present study was to investigate the frequency and characteristics of borreliosis among patients with peripheral facial palsy in different parts of Sweden. All serological tests were performed in one laboratory. Ten Swedish Ear Nose and Throat clinics participated in a prospective 1-year study of patients seeking medical attention for acute peripheral facial palsy. Twenty-eight (6%) out of totally 446 patients fulfilled the criteria for the diagnosis of borreliosis. The frequency varied between 1 and 16% and was highest along the southeast coast of Sweden whereas no case was reported from the northern part of the country. Borreliosis was more common among children with facial palsy than among adults. The infection occurred during all seasons although it appears to be less frequent during the spring months. Only a minority of the borrelial patients had a history of a preceding tick bite or erythema migrans. The fairly low overall frequency of this secondary stage of borreliosis in the study may be a result of better knowledge of the disease and earlier treatment of its early manifestations. In Sweden's endemic areas borreliosis is a common cause of peripheral facial palsy, and therefore all patients with facial palsy in these regions should be examined for borrelial infection.
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| 6. |
- Grün, E., et al.
(författare)
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Dust Measurements During Galileo's Approach to Jupiter and Io Encounter
- 1996
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 274:5286, s. 399-401
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Tidskriftsartikel (refereegranskat)abstract
- About a hundred dust impacts per day were detected during the first week in December 1995 by Galileo during its approach to Jupiter. These impacts were caused by submicrometer-sized particles that were just above the detection limit. After the closest approach to Io on 7 December, impacts of these small particles ceased. This effect is expected for dust grains emitted from Io that exit the field of view of the instrument after the flyby. The impact rate of bigger micrometer-sized dust grains continued to increase toward Jupiter. These dust particles are in orbit about Jupiter or are interplanetary grains that are gravitationally concentrated near Jupiter.
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| 7. |
- Grün, E., et al.
(författare)
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Dust measurements in the Jovian magnetosphere
- 1997
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Ingår i: Geophysical Research Letters. - 1944-8007. ; 24:17, s. 2171-2174
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Tidskriftsartikel (refereegranskat)abstract
- Dust measurements have been obtained with the dust detector onboard the Galileo spacecraft inside a distance of about 60RJ from Jupiter (Jupiter radius, RJ = 71,492 km) during two periods of about 8 days around Galileo's closest approaches to Ganymede on 27 June and on 6 Sept 1996. The impact rate of submicrometer-sized particles fluctuated by a factor of several hundred with a period of about 10 hours, implying that their trajectories are strongly affected by the interaction with the Jovian magnetic field. Concentrations of small dust impacts were detected at the times of Ganymede closest approaches that could be secondary ejecta particles generated upon impact of other particles onto Ganymede's surface. Micrometer-sized dust particles, which could be on bound orbits about Jupiter, are concentrated in the inner Jovian system inside about 20RJ from Jupiter.
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| 8. |
- Grün, E., et al.
(författare)
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Galileo observes electromagnetically coupled dust in the Jovian magnetosphere
- 1998
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Ingår i: Journal of Geophysical Research. - 2156-2202. ; 103:E9, s. 20011-20022
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Tidskriftsartikel (refereegranskat)abstract
- Measurements of dust coupled to the Jovian magnetosphere have been obtained with the dust detector on board the Galileo spacecraft. We report on data obtained during the first four orbits about Jupiter that had flybys of the Galilean satellites: Ganymede (orbits 1 and 2), Callisto (orbit 3), and Europa (orbit 4). The most prominent features observed are highly time variable dust streams recorded throughout the Jovian system. The impact rate varied by up to 2 orders of magnitude with a 5 and 10 hour periodicity, which shows a correlation with Galileo's position relative to the Jovian magnetic field. Around 20 RJ (Jupiter radius, RJ=71, 492 km) in bound a dip in the impact rate has been found consistently. At the same times, reversals by 180° in impact direction occurred. This behavior can be qualitatively explained by strong coupling of nanometer-sized dust to the Jovian magnetic field. At times of satellite flybys, enhanced rates of dust impacts have been observed, which suggests that all Galilean satellites are sources of ejecta particles. Inside about 20 RJ impacts of micrometer-sized particles have been recorded that could be particles on bound orbits about Jupiter.
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| 9. |
- Hanner, P, et al.
(författare)
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Clinical observations of effects on central nervous system in patients with acute facial palsy.
- 1987
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Ingår i: Archives of otolaryngology--head & neck surgery. - 0886-4470. ; 113:5, s. 516-20
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Tidskriftsartikel (refereegranskat)abstract
- Twenty-eight consecutive patients with acute unilateral facial palsy were examined with special reference to clinical signs of central nervous system involvement. The clinical investigation in the acute stage of the disease showed that only seven patients had solitary facial nerve dysfunction, while the remaining patients had evidence of more widespread disease involvement. The most frequent finding was a trigeminal dysfunction of the paretic side, as shown by paresthesia and sensibility disturbance corresponding to the sensoritrigeminal area, as well as a dysfunction of the trigeminal component of the corneal reflex of the paretic side. Three patients showed migrating symptoms that were suggestive of a brain-stem disorder. In addition, four patients had an optic neuropathy, while an abnormal brain-stem audiometry response was demonstrated in five patients. The outcome of acute facial palsy one to two years after onset, however, could not be predicted from the clinical central nervous system signs. The degree of the palsy in the acute stage of the disease still seemed to be one of the most important prognostic factors. It is concluded that acute facial palsy is not a single entity, but rather a feature of different neurologic conditions.
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| 10. |
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