22281. |
- Ödéen, Sven, et al.
(författare)
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Prediction of impact force by impulse response method
- 1991
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Ingår i: International Journal of Impact Engineering. - 0734-743X .- 1879-3509. ; 11:2, s. 149-158
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Tidskriftsartikel (refereegranskat)abstract
- A method has been established which permits prediction of impact force history from the velocity response of each impacting body to an impulsive force applied to its impact face, and the impact velocity. The bodies may consist of one or several linearly elastic or viscoelastic materials. However, the method is limited to cases of impact without significant effects of friction and slip, with constant contact area and with small deformations. It has been applied to four cases of axial impact of a truncated cone or a compound cylinder on a long cylindrical rod. The truncated cone was made of Nylon-6, the compound cylinder of Nylon-6 and aluminum, and the long cylindrical rod of steel. For the truncated cone and the compound cylinder, measured as well as theoretically predicted impulse responses were used, while for the long cylindrical rod only a theoretically predicted impulse response was employed. In all cases good agreement was obtained between the impact force histories predicted, using the impulse response method, and those measured with the aid of strain gauges on the long cylindrical rod. Because of three-dimensional effects the best agreement was obtained for the predictions based on measured impulse responses for the truncated cone and the compound cylinder
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22282. |
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22283. |
- Ödkvist, L. M., et al.
(författare)
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Dynamic posturography
- 1990
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Ingår i: Wissenschaftliche Zeitschrift der Humboldt-Universität zu Berlin : Neurootologie I. ; 39, s. 359-360
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Tidskriftsartikel (refereegranskat)
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22284. |
- Ödkvist, L. M., et al.
(författare)
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Dynamic posturography
- 1991
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Ingår i: Vestibular diagnosis and neuro-otosurgical management of the skull base. - : Demeter Verlag. - 3893830278 ; , s. 90-98
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Konferensbidrag (refereegranskat)
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22285. |
- Ödkvist, L. M., et al.
(författare)
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Dynamic posturography in polyneuropathy
- 1992
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Ingår i: Diagnostic procedures and imaging techniques used in neurootology. - Hamburg : Edition M + P. - 3922326366 ; , s. 167-172
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Konferensbidrag (refereegranskat)
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22286. |
- Ödkvist, L., et al.
(författare)
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Otoneurologic disturbances caused by solvent pollution
- 1992
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Ingår i: Otolaryngology and head and neck surgery. - 0194-5998 .- 1097-6817. ; 106:6, s. 687-692
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Tidskriftsartikel (refereegranskat)abstract
- Subjects exposed to industrial solvents may experience vertigo and nausea. Solvents are usually volatile hydrocarbon compounds, which are important parts of everyday life in a modern society. They may also cause neurastenia, personality changes, and reduced intellectual capacity. The syndrome that may develop was formerly named psycho-organic syndrome (POS), but in modern terminology it is called chronic toxic encephalopathy (CTE). The syndrome develops slowly, and during the first years no pathological findings will be found using various test batteries. Somewhat later, when the syndrome still might be reversible, psychometric, auditory, and otoneurologic testing may well unveil disturbances within the posterior fossa structures. Animal experiments suggest one site of effect for solvents to be within the cerebellum and brainstem regions with close relationship to the gamma-amino-butyric acid (GABA) transmission. In the otoneurologic test battery, visual suppression and smooth pursuit are of extreme value, as are some auditory tests such as discrimination of interrupted speech and cortical response audiometry using frequency glides as stimuli. Dynamic posturography and magnetic resonance imaging (MRI) have recently proved valuable in the diagnosis. Research is needed concerning the most efficient test battery for early detection of solvent-induced lesions. During further research it is important to unveil other toxic agents, like heavy metals and alcohol, and their damage to the central nervous system and to make comparisons between these substances and the lesions caused by hydrocarbon solvents.
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22287. |
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22288. |
- Ödkvist, Lars, et al.
(författare)
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Rotatory tests
- 1993
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Ingår i: NES 1993.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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22289. |
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22290. |
- Ödling, Ola, et al.
(författare)
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Building MIB Applications
- 1994
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Ingår i: IEEE Network Operations and Management Symposium. - Piscataway, NJ : IEEE Communications Society. ; , s. 565-575
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Konferensbidrag (refereegranskat)
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