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Aspergillosis of the paranasal sinuses (1992)

Chang, T. ; Teng, M. M. H. ; Wang, S. F. ; [et al.]

Springer

Neuroradiology 34 (1992), S. 520-523

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ISSN: 1432-1920

Keywords: Computed tomography ; Paranasal sinuses ; Fungus ; Aspergillosis

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The CT appearances of 13 cases of pathologically proven aspergillosis involving paranasal sinuses were reviewed. Symptoms included rhinorrhea, nasal obstruction, headache, facial pain and foul smell from the nose. At operation, these lesions appeared yellowish, brownish, grey or black in colour, and contained dirty or muddy material. Microscopic examination of the tissue removed showed anAspergillus ball with chronic inflammation but without invasion of the nasal or sinus mucosa in 6 cases, and tissue invasion with necrosis and inflammation in 7. The structures involved, in order of frequency, were: maxillary sinus, nasal cavity, ethmoid sinus, orbit and cavernous sinus. The orbit was involved in 2 cases, therefore categorized as invasive; the other 11 cases were non-invasive as judged by CT. Calcification was seen in the lesions of 9 cases. In most cases the adjacent bony structures showed areas of erosion and sclerosis. Aspergillosis should be suspected in the presence of a mass in the paranasal sinuses or nasal cavity with calcification within it, which may not appear solid or dense and is separate from the walls of the sinus.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00598965

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Effects of physical aging on dynamic mechanical and transient properties of polyetheretherketone (1989)

Wang, S. F. ; Ogale, A. A.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 29 (1989), S. 1273-1278

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ISSN: 0032-3888

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The effects of physical aging on dynamic mechanical and transient stress-relaxation properties of a high performance thermoplastic, polyetheretherketone (PEEK), are reported in this study. The aging effects are shown to be physical effects (and not chemical degradation) by establishing thermoreversibility of the aging process. The unique aspect of the present study is the simultaneous investigation of both dynamic and transient properties in the same mode of loading, namely, in shear. The influence of continuous dynamic deformation on the aging process is also reported. The results for the aging rate, obtained from dynamic and transient testing under shear load, agree with one another and verify the equivalence of dynamic and transient viscoelastic properties. However, these results differ significantly from the aging rate results reported in an earlier study for tensile loading. A possible explanation for the difference has been proposed in terms of the volume change that accompanies tensile creep deformation.

Additional Material: 11 Ill.