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  • 1
    Electronic Resource
    Electronic Resource
    Topology-Oriented Implementation—An Approach to Robust Geometric Algorithms (2000)
    Springer
    Algorithmica 27 (2000), S. 5-20 
    Details
    ISSN: 1432-0541
    Keywords: Key words. Clipping a convex polyhedron, Line-segment Voronoi diagram, Robust implementation, Topological consistency.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. This paper presents an approach, called the ``topology-oriented approach,'' to numerically robust geometric algorithms. In this approach, the basic part of the algorithm is described in terms of combinatorial and topological computation primarily; this description guarantees robustness of the algorithm because combinatorial and topological computation is never contaminated with numerical errors. However, this part of the algorithm is usually nondeterministic, the flow of processing containing many alternative branches. Hence, numerical computation is used in order to choose the branch that seems the most promising to lead to the correct answer. The algorithm designed in this way is robust and simple. The basic idea of this approach as well as the basic properties of the resulting algorithms is shown with examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004530010002
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  • 2
    Electronic Resource
    Electronic Resource
    Thymic sarcomatoid carcinoma with skeletal muscle differentiation: report of two cases, one with cytogenetic analysis (2002)
    Oxford UK : Blackwell Science Ltd
    Histopathology 40 (2002), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Thymic sarcomatoid carcinoma with skeletal muscle differentiation: report of two cases, one with cytogenetic analysis Aims: Malignant thymic tumour histologically resembling a soft tissue sarcoma is extremely rare and defined as sarcomatoid carcinoma in the recent World Health Organization (WHO) classification. We report two such cases in which the tumour cells showed a prominent rhabdomyoblastic differentiation and analyse whether these tumours retain an epithelial nature at least in part. Methods and results: One tumour occurred in a 51-year-old man (Case 1) and the other in a 40-year-old woman (Case 2). Microscopically, both tumours consisted essentially of two types of tumour cells: spindle and large round cells, with no apparent epithelial components. Osteosarcomatous small foci were also found in Case 2. Immunohistochemically, desmin and muscle-specific actin were positive in the majority of both types of tumour cells, whereas myogenin was predominant in the spindle cells and myoglobin in the large round cells. Some of both types of cells expressed cytokeratin with co-expression of myoglobin in the large round cells, but with no myogenin in the spindle cells. Some cytokeratin-positive spindle cells were also negative for desmin. Ultrastructural examination of a recurrent tumour in Case 2 revealed some epithelial features among the spindle cells. Cytogenetic study of the same tumour showed a complex abnormality including der(16)t(1;16)(q12;q12.1), an identical pattern previously reported in a case of thymic squamous cell carcinoma. Conclusions: The findings support the definition in the WHO classification of sarcomatoid carcinoma that includes purely sarcomatous tumour as in the present cases. Occurrence of this type of tumour may indicate a relationship between thymic epithelial cells and myoid cells and/or a potential for divergent differentiation in thymic epithelial tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2559.2002.01310.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Differential expression of dihydropyrimidinase-related protein genes in developing and adult enteric nervous system (2000)
    Springer
    Histochemistry and cell biology 113 (2000), S. 37-41 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  Dihydropyrimidinase-related proteins (DRPs) are involved in axonal outgrowth and pathfinding. However, little is known about their significance in the enteric nervous system (ENS), the largest and most complex division of the peripheral nervous system. Using in situ hybridization (ISH) and northern blotting, we examined mRNA expression of DRP-1–4 transcripts in the developing and adult mouse digestive tract and in the adult human colon. ISH detected the mouse DRP-3 transcript in the developing ENS on embryonic day (E)12 and at the later stages as well as in the adult intestine. Mouse DRP-1 and -2 transcripts appeared at E14. DRP-2 transcript was also detected in the adult intestine although DRP-1 expression was lower in the adult. DRP-4 gene was not expressed in the ENS during development or adulthood whereas the signal was apparent in the developing and adult central nervous system (CNS). The DRP expression pattern in the human colon was similar to that of the mouse large intestine. Northern blot analysis showed that DRPs were differentially expressed in the mouse and human intestines, supporting the results of ISH. These data suggest that DRPs play a role not only in the CNS but also in the ENS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004180050005
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Relationship between microstructure of plasma-sprayed 8YZ coatings and thermal fatigue life of thermal barrier coatings (2000)
    Springer
    Journal of materials science 35 (2000), S. 317-321 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Microstructure of plasma-sprayed yttria-stabilized zirconia coatings (8YZ) was characterized by the measurement of surface roughness, hardness, and pore size distribution and was correlated with thermal fatigue life. It was confirmed that the coatings which had greater roughness tended to show both lower hardness and higher porosity. Furthermore, such coatings were found to have a longer thermal fatigue life. We propose that measurement of the roughness of 8YZ coatings is useful as a non-destructive evaluation method for predicting thermal fatigue life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004745301833
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    Paper (German National Licenses)
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