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  • 1
    Book
    Book
    Contact problems in elasticity : a study of variational inequalities and finite element methods (1988)
    Philadelphia, PA :Society for Industrial and Applied Mathematics,
    Details
    Title: Contact problems in elasticity : a study of variational inequalities and finite element methods
    Author: Kikuchi, N.
    Contributer: Oden, John T.
    Publisher: Philadelphia, PA :Society for Industrial and Applied Mathematics,
    Year of publication: 1988
    Pages: XIII, 495 S.
    Series Statement: SIAM studies in applied mathematics
    ISBN: 0-89871-202-5
    Type of Medium: Book
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    ZIB Catalog
    Zuse Institute Berlin get availability status
  • 2
    Electronic Resource
    Electronic Resource
    Optimization of 2-D structures subjected to nonlinear deformations using the homogenization method (1999)
    Springer
    Structural optimization 17 (1999), S. 286-299 
    Details
    ISSN: 0934-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The generalized layout optimization method is applied to nonlinear problems. The algorithm was originally invented by Bendsøe and Kikuchi (1988), where an admissible design domain is assumed to be composed of periodic microstructures with tiny cavities; the sizes and the rotational angle of the cavities are defined as design variables which are optimized to minimize the applied work. The macroscoic material tensor of the porous material is calculated by the homogenization method for the sensitivity analysis. In order to apply it to nonlinear problems, we present a 2-D database of the material tensor calculated by the elasto-plastic homogenization method and an interpolation technique of the database for the practical computation. Several numerical examples of 2-D structures and a thin shell are shown to demonstrate the effectiveness of our algorithms. The algorithm is also extended to the finite deformation problems, and a practical optimized design is exhibited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01207005
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Intracranial haemodynamics in diffuse and focal brain injuries. Evaluation with transcranial Doppler (TCD) ultrasound (1990)
    Springer
    Acta neurochirurgica 107 (1990), S. 5-10 
    Details
    ISSN: 0942-0940
    Keywords: Severe head injury ; haemodynamic ; ICP ; ultrasonography ; TCD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Intracranial haemodynamics were studied in 20 patients with diffuse and focal brain injury and experimental animals with acute intracranial hypertension by the use of TCD ultrasound. The mean flow velocity in the middle cerebral artery (MCA) commonly decreased on the side of the haematoma depending on intracranial pressure (ICP) elevation and cerebral perfusion pressure (CPP) reduction in focal injury. The decrease of the MCA flow velocity returned to normal after treatment. The flow velocities decreased bilaterally and there was no difference between the right and left side in diffuse injury. But the velocities increased in spite of ICP elevation when diffuse cerebral swelling developed. Cerebrovascular CO2 reactivity was impaired in two groups of patients with low Glasgow Coma Scale (GCS) scores. The mean velocity of the MCA and blood flow in the internal carotid artery exhibited flow patterns which changed correlatively depending on CPP reduction in experimental animals. Noninvasive study by use of TCD ultrasound can provide valuable information on variant haemodynamic phenomena in patients with diffuse and focal brain injury.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402605
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Optima topology design of structures under dynamic loads (1999)
    Springer
    Structural optimization 17 (1999), S. 208-218 
    Details
    ISSN: 0934-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract When elastic structures are subjected to dynamic loads, a propagation problem is considered to predict structural transient response. To achieve better dynamic performance, it is important to establish an optimum structural design method. Previous work focused on minimizing the structural weight subject to dynamic constraints on displacement, stress, frequency, and member size. Even though these methods made it possible to obtain the optimal size and shape of a structure, it is necessary to obtain an optimal topology for a truly optimal design. In this paper, the homogenization design method is utilized to generate the optimal topology for structures and an explicit direct integration scheme is employed to solve the linear transient problems. The optimization problem is formulated to find the best configuration of structures that minimizes the dynamic compliance within a specified time interval. Examples demonstrate that the homogenization design method can be extended to the optimal topology design method of structures under impact leads.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195945
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Topology optimization of compliant mechanisms with multiple outputs (1999)
    Springer
    Structural optimization 17 (1999), S. 269-278 
    Details
    ISSN: 0934-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A procedure for the topology design of compliant mechanisms with multiple output requirements is presented. Two methods for handling the multiple output requirements are developed, a combined virtual load method and a weighted sum of objectives method. The problem formulations and numerical solution procedures are discussed and illustrated by design examples. The examples illustrate the capabilities of the design procedure, the effect of the direction of the output deflection requirements on the solution, as well as computational issues such as the effect of the starting point and effect of the material resource constraint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01207003
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    CT and MR findings of torsion of greater omentum: a case report (1997)
    Springer
    Abdominal imaging 22 (1997), S. 45 -46 
    Details
    ISSN: 1432-0509
    Keywords: Key words: Torsion—Greater omentum—Diagnosis—CT—MR.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We report a case of torsion of the greater omentum, which occurred in a 39-year-old man with an adhesive inguinal hernia. Preoperative computed tomography and magnetic resonance (MR) imaging showed a characteristic whirling fatty mass occupying the middle and lower abdomen anteriorly. MR imaging also showed difference of intensities in the twisted omentum, suggesting the presence of the pathological conditions of edema or congestion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900136
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A comparison of homogenization and standard mechanics analyses for periodic porous composites (1992)
    Springer
    Computational mechanics 10 (1992), S. 73-95 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Composite material elastic behavior has been studied using many approaches, all of which are based on the concept of a Representative Volume Element (RVE). Most methods accurately estimate effective elastic properties when the ratio of the RVE size to the global structural dimensions, denoted here as ν, goes to zero. However, many composites are locally periodic with finite ν. The purpose of this paper was to compare homogenization and standard mechanics RVE based analyses for periodic porous composites with finite ν. Both methods were implemented using a displacement based finite element formulation. For one-dimensional analyses of composite bars the two methods were equivalent. Howver, for two- and three-dimensional analyses the methods were quite different due to the fact that the local RVE stress and strain state was not determined uniquely by the applied boundary conditions. For two-dimensional analyses of porous periodic composites the effective material properties predicted by standard mechanics approaches using multiple cell RVEs converged to the homogenization predictions using one cell. In addition, homogenization estimates of local strain energy density were within 30% of direct analyses while standard mechanics approaches generally differed from direct analyses by more than 70%. These results suggest that homogenization theory is preferable over standard mechanics of materials approaches for periodic composites even when the material is only locally periodic and ν is finite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369853
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Plasmin Converts Pro-Form of Group-I Phospholipase A"2 into Receptor-Binding, Active Forms
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 198 (1994), S. 10-15 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/bbrc.1994.1002
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Separation and determination of betaine in an oriental medicine by liquid chromatography
    Amsterdam : Elsevier
    Analytica Chimica Acta 283 (1993), S. 338-343 
    Details
    ISSN: 0003-2670
    Keywords: Betaine ; Liquid chromatography ; Pharmaceuticals
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0003-2670(93)85241-B
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Reaction of aluminum clusters, Al"n (n=7-24), with oxygen and ammonia
    Amsterdam : Elsevier
    Chemical Physics Letters 147 (1988), S. 479-483 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(88)85012-7
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    Paper (German National Licenses)
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