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  • 11
    Electronic Resource
    Electronic Resource
    Facet formation sign in sarcoidosis: a new sign in endoscopic ultrasonography (1992)
    Springer
    European radiology 2 (1992), S. 526-531 
    Details
    ISSN: 1432-1084
    Keywords: Endoscopy ; Lymphatic system, ultrasound studies ; Lymphatic system, diseases ; Mediastinum, ultrasound studies ; Sarcoidosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Endoscopic ultrasound was performed in 56 patients with histologically or clinically proven mediastinal or lung diseases. These 56 patients comprised 12 with sarcoidosis, 8 with lymphoma, 20 with lung cancer, 10 with oesophageal cancer, and 6 with other diseases. A 7.5 MHz electronic linear-arrayed ultrasonic endoscope was used. In 38 of the 56 patients lymph nodes were detected by endoscopic ultrasound. Eleven patients with sarcoidosis showed lymph nodes in a “facet formation” (like stones in an old stone wall), while lymph nodes in the other 27 patients were round in shape and did not form facets. The “facet formation sign”, evaluated by endoscopic ultrasound, may be a characteristic finding in sarcoidosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187546
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  • 12
    Electronic Resource
    Electronic Resource
    Posterior cranial fossa dural arteriovenous malformation with a varix mimicking a thrombosed aneurysm: case report (1993)
    Springer
    Neuroradiology 35 (1993), S. 210-211 
    Details
    ISSN: 1432-1920
    Keywords: Dural arteriovenous malformation ; Posterior cranial fossa ; Varix ; Computed tomography ; Magnetic resonance imaging ; Thrombosed aneurysm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Dural arteriovenous malformations (AVMs) in the posterior cranial fossa are relatively infrequent. Intradural haemorrhage is one of their specific complications. Angiographic demonstration of varices or aneurysmal structures is one of the hallmarks of severe cases. We report a patient with posterior cranial fossa dural AVM associated with a varix mimicking a thrombosed aneurysm on CT and MRI. Internal carotid and vertebral angiography failed to demonstrate an aneurysm, but external carotid injection revealed a dural AVM affecting the sigmoid sinus, and a varix. The AVM was completely eliminated by embolization. When a dural AVM is suspected clinically selctive angiography should be performed to confirm the diagnosis even when CT or MRI do not show dilated vessels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588496
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  • 13
    Electronic Resource
    Electronic Resource
    Acquired epidermoid tumour in the thoracic spinal canal (1993)
    Springer
    Neuroradiology 35 (1993), S. 316-318 
    Details
    ISSN: 1432-1920
    Keywords: Epidermoid tumour ; Iatrogenic lesion ; Thoracic spine ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Acquired spinal epidermoid tumours are rare, and probably caused by skin fragments that have been transplanted by trauma or lumbar puncture. They almost always occur in the region of the cauda equina. We present an acquired spinal epidermoid tumour at the T 10 level, with pathological confirmation. A skin fragment had migrated to a site where it developed into a tumour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602624
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  • 14
    Electronic Resource
    Electronic Resource
    Elastodynamic analysis of crack by finite element method using singular element (1978)
    Springer
    International journal of fracture 14 (1978), S. 59-68 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé La méthode des éléments finis utilisant un élément singulier au voisinage de l'extrémité d'une fissure a été étendue aux problèmes élastodynamiques des fissures tels qu'ils se posent lorsque la fonction de déplacement d'un élément singulier est prise à partir de la solution d'une fissure en cours de propagation. Le facteur d'intensité des contraintes dynamiques correspondant à des fissures de mode III ou des déformations de mode I dans une plaque finie a été déterminé. Les résultats des calculs correspondant à des fissures stationnaires ou des fissures en cours de propagation sous des charges dynamiques sont comparées aux solutions analytiques obtenues par d'autres auteurs. On montre que la méthode présentée décrit de façon satisfaisante la variation en fonction du temps du facteur d'intensité des contraintes dans les problèmes de fissuration dynamique.
    Notes: Abstract The finite element method using a singular element near the crack tip is extended to the elastodynamic problems of cracks where the displacement function of the singular element is taken from the solution of a propagating crack. The dynamic stress intensity factor for cracks of mode III or mode I deformations in a finite plate is determined. The results of computation for stationary cracks or propagating cracks under dynamic loadings are compared with the analytical solutions of other authors. It is shown that the present method satisfactorily describes the time variation of the stress intensity factor in dynamic crack problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032384
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  • 15
    Electronic Resource
    Electronic Resource
    Elastic-plastic crack growth on plane strain bimaterial interface (1992)
    Springer
    Acta mechanica Sinica 8 (1992), S. 261-270 
    Details
    ISSN: 1614-3116
    Keywords: interface crack growth ; plane strain ; modified Gurson's model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Finite element computation are carried out to simulate plane strain crack growth on a bimaterial interface under the assumption of small scale yielding. The modified Gurson constitutive equation and the element vanish technique introduced by Tvergaard et al. are used to model the final formation of an open crack. It is found from the calculation that the critical fracture toughness for crack growth is much lower in bimaterials than that in homogeneous material. The critical fracture toughness is strongly dependent on material properties of the bimaterial pair and the mixed mode of remote loads. The interface crack grows in the more compliant (lower hardening) material or in the weaker (lower yield strength) material. In Mode-I loading, the crack grows zigzag along the interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02489250
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  • 16
    Electronic Resource
    Electronic Resource
    Phase diagram and phase structure of the barium ethyl(octyl) phosphate-water system.1H pulsed-gradient NMR self-diffusion studies (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 713-719 
    Details
    ISSN: 1435-1536
    Keywords: Phase structure ; self-diffusion ; ethyl (octyl) phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Barium ethyl(octyl)phosphate (EOP), ((C2H5O)(C8H17O)PO 2 − )2Ba2+, was synthesized and the phase diagram of the EOP-water system consisting of four regions (I, II, III, and IV) was determined. The phase structure was studied from the self-diffusion coefficients obtained by the1H pulsed-gradient NMR method. In region I, a critical micelle concentration (CMC) was found, indicating the presence of a monomer ⇆ micelle equilibrium. Region II is a two-phase area in which regions I and III coexist. For region III, the structure of the aggregate system was found to depend upon the concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657409
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  • 17
    Electronic Resource
    Electronic Resource
    Crack growth on elastic-plastic bimaterial interfaces (1992)
    Springer
    International journal of fracture 57 (1992), S. 365-379 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Finite element calculation based on finite strain theory is carried out to simulate the crack growth on bimaterial interfaces under the assumption of small scale yielding and plane strain condition. The modified Gurson's constitutive equation and the element vanish technique introduced by Tvergaard et al. are used to model the final formation of an open crack. The crack growths in homogeneous material and in bimaterials are compared. It is found from the calculation that the critical macroscopic fracture toughness for crack growth J IC is much lower in bimaterials than in homogeneous material. For bimaterial cases, the J IC of a crack between two elastic-plastic materials which have identical elastic properties with different yield strength is lower than that of a crack between an elastic-plastic material and a rigid substrate. It seems that the difference in yield strength between the dissimilar materials has more significant influence on the void nucleation and crack growth than the difference in hardening exponent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013059
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