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  • 1
    Publication Date: 1996-03-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 2
    Publication Date: 1974-06-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 3
    Publication Date: 1975-01-01
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Wiley on behalf of American Ceramic Society.
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  • 4
    Publication Date: 1994-01-01
    Print ISSN: 0266-3538
    Electronic ISSN: 1879-1050
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 5
    Publication Date: 1992-06-01
    Print ISSN: 0045-7825
    Electronic ISSN: 1879-2138
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Published by Elsevier
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  • 6
    Publication Date: 1986-02-01
    Print ISSN: 0045-7825
    Electronic ISSN: 1879-2138
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Published by Elsevier
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 13 (1975), S. 405-413 
    ISSN: 1741-0444
    Keywords: Skulls ; Helmets ; Impact ; Dynamic strain ; Head
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Les résultats expérimentaux contrainte/temps sont présentés pour des crânes modèles anthropométriques et des crânes humains protégés et non protégés et soum is à des charges d'impact. La présente étude a pour but de déterminer, en utilisant comme projectile une galine de hockey, l'efficacité des suspensions de casque et la probabilité de fractures crâniennes dans diverses conditions de protection de la tête. On donne la description d'un agencement expérimental. La technique d'extensiomètre utilisée nonne des résultats sûrs et reproduisibles. Les tensions maximales se produisent au-dessus de l'orbite et dans les régions temporales, ce qui concorde avec les recherches antérieures. Un casque massif à suspension souple assure une protection maximale contre les coups engendrant des fractures mais il n'est probablement pas pratique pour d'autres raisons. Une analyse de système linéarisé a corroboré les résultats des expériences.
    Abstract: Zusammenfassung Es werden experimentelle Ergebnisse aus Beanspruchung/Zeit für ungeschützte und geschützte menschliche und anthropometrische Modellschädel unter Stoßbelastung vorgelegt. Diese Untersuchung, bei der ein Hockeyschläger als Wurfgeschoß verwendet wird, hat den Zweck festzustellen, wie wirksam Schutzhelmfederungen sind und wie wahrscheinlich Schädelfrakturen unter verschiedensten Bedingungen mit Kopfschutz auftreten. Es wird eine experimentelle Anordnung beschrieben, und die Beanspruchungs meßtechnik liefert verläßliche, reproduzierbare Ergebnisse. Spitzenbeanspruchungen entstehen über der Augenhöhle und in den Schläfbereichen, was mit früheren Untersuchungen übereinstimmt. Ein massiver, flexibel gefederter Schutzhelm bietet gegen Schläge, die Brüche verursachen, maximalen Schutz, ist jedoch wahrscheinlich aus anderen Gründen unpraktisch. Die experimentellen Ergebnisse wurden durch eine linearisierte Systemanalyse bekräftigt.
    Notes: Abstract Experimental strain/time results are presented for unprotected and protected human and anthropometric model skulls under impact loading. Using a hockey puck as the projectile, the purpose of this study is to determine the effectiveness of helmet suspensions and the likelihood of skull fractures with varying conditions of head protection. An experimental arrangement is described, and the strain-gauge technique yields reliable, reproducible results. Peak stresses occur above the orbit and in the temporal regions, which agrees with previous investigations. A massive, flexibly suspended helmet offers maximum protection from fracture-inducing blows, but is probably impracticable for other reasons. A limited system analysis has corroborated the experimental results.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 18 (1980), S. 625-632 
    ISSN: 1741-0444
    Keywords: Diaphragm ; Elasticity ; Modulus ; Muscle ; Passive
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A measuring system used to monitor the orthogonal stresses and strains in the plane of the passive canine diaphragm musclein vivo is described. The system consists of four topically applied force-displacement transducers, a laser-camera subsystem to determine the local radii of curvature and an abdominally situated pressure transducer. Experimental results show that the passive musclein situ behaves as an anisotropic linearly elastic material for loads in the physiological range. A model is proposed which describes the diaphragm's response to load in terms of two moduli. Values obtained experimentally for the moduli are discussed.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 5 (1984), S. 72-80 
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Stiffness matrices are predicted, using the Halpin-Tsai laminate analogy, at different locations in 4 short glass-fiber-reinforced thermoplastic moldings, and the resulting anisotropy and inhomogeneity discussed, relative to quasi-isotropic values. The predictions are based on actual material structure as obtained from contact microradiographs. Considerable anisotropy and inhomogeneity are noted. The response of the materials to tensile, flexure, and shear loads is calculated and it is shown that this deviates to a lesser degree from a quasiisotropic response. Finally the load deformation behavior in plate bending and twisting are predicted using both a quasiisotropic model and the stiffness properties based on actual structure and compared with previously available experimental data. It is concluded that, in the absence of a predictive approach to fiber orientation in short-glass-fiber-reinforced thermoplastic moldings, the use of quasi-isotropic stiffness data provides an acceptable means of performing deformation design analysis. Based on the analysis of the moldings considered, the quasi-isotropic assumption could be expected to introduce errors of less than 20 percent in deformation predictions for planar moldings.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 6 (1995), S. 267-282 
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Crestal bone loss is observed around various designs of dental implants. A possible cause of this bone loss is related to the stresses acting on periimplant bone. To investigate the relationship between stress state and bone loss, two-dimensional finite element models corresponding to bucco-lingual and mesio-distal sections of canine mandibles with one of two designs of porous-coated dental implants were analyzed. A fully porous-coated design consisting of a solid Ti6A14V core had a porous coating over the entire outer surface of the implant component, while a partially porous-coated design had the porous coating over the apical two-thirds of the implant surface only. Occlusal forces with axial and transverse components were assumed to act on the implant with interface bonding and effective force transfer at all porous coat-bone interfaces and no bonding for the non-porous-coated regions. The results of the analysis indicated that at most implant aspects (buccal, lingual, mesial, and distal), the equivalent stresses in crestal bone adjacent to the coronal-most, non-porous-coated zone of the partially porous-coated implants were lower than around the most coronal region of the fully porous-coated implants. The region of lower stresses around the partially porous-coated implants corresponded to observed areas of crestal bone loss in animal studies, suggesting that crestal bone loss in this case was due to bone disuse atrophy. A number of parameters of the finite element models were varied to determine the effect on the resulting stress fields and, therefore, possible long-term bone remodeling. Based on differences in observed bone structures by histological examination and results of finite element analyses with fully and partially porous-coated implants, an equivalent stress equal to 1.6 MPa was determined to be sufficient to avoid bone loss due to disuse atrophy in the canine mandibular premolar region. © 1995 John Wiley & Sons, Inc.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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