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  • 1
    Electronic Resource
    Electronic Resource
    Enhancement of Press Formability of Rolled Mg Alloy Sheet by Using Cross Rolling Processes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1615-1619 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, two different cross rolling processes, which are effective rolling processes fora reduction of (0002) plane texture, are introduced. In the first cross rolling process, a sheet specimenis rotated around the rolling plane normal after each pass. In the second cross rolling process, the rollaxis is tilted against the transverse direction (TD) in the rolling direction (RD) - TD plane. The twocross-rolling processed were carried out on a AZ31 alloy, and the press formability of cross-rolledsheets was compared with that of unidirectionally rolled sheets determined by Erichsen tests at 433 –493 K. Both the cross-rolled specimens exhibited a high press formability, compared to anunidirectionally rolled alloy. The high press formability of the specimen by the first cross rolling wasdue to a reduction in (0002) texture intensity. The high press formability of the specimen by thesecond cross rolling was due to not only a reduction in (0002) texture intensity but also grainrefinement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1615.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Press Formability of Mg Alloy Processed by Cross-Roll Rolling (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 179-182 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Cross-roll rolling with different rolling routes (unidirectional rolling and reverse rolling)was carried out on a commercial Mg alloy sheets. In the cross-roll rolling, the roll axis was tilted by7.5 degrees against the transverse direction. As a result of the Erichsen tests at 433 – 493 K, the stretchformability of the reverse cross-rolled specimen was higher than that of the unidirectional cross-rolledspecimen. The reverse cross-rolled specimen showed lower average Lankford value compared withthe unidirectional cross-rolled specimen. This is likely to be responsible for the enhanced stretchformability of the reverse cross-rolled specimen. The higher stretch formability was attributed toreduction of (0002) texture intensity, which was originated from random grain distribution
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.179.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    On Superplastic Forming of Pure Titanium for Constructing Dental Implants (1999)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 304-306 (Feb. 1999), p. 747-752 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.304-306.747.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Down-Regulation of Vascular Adhesion Molecule-1 by Fluid Shear Stress in Cultured Mouse Endothelial Cells (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 748 (1994), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1994.tb17314.x
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication and properties of hot-pressed SiC whisker-reinforced TiB2 and TiC composites (1989)
    Springer
    Journal of materials science 8 (1989), S. 566-568 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720300
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  • 6
    Electronic Resource
    Electronic Resource
    Theoretical relationship between the optimal models of the vascular tree (1974)
    Springer
    Bulletin of mathematical biology 36 (1974), S. 311-323 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Two models of optimal branching structure of the vascular tree are compared. Murray’s minimum work model derived from minimum energy loss due to flow and volume in the duct system is proved to be included as a mathematical group in the authors’ model defined by the minimum volume under determinant pressure, flow and position at the terminals. The problem about heterotypical trees which are identical at the terminal conditions but different in the topological order of branch combinations are discussed, applying the results of analyses on the equivalent duct of uniform terminal pressure trees. It is proved that the minimum work tree has the least energy loss compared with its heterotypical minimum volume trees and is a better model of branching structure of the vascular tree.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461331
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  • 7
    Electronic Resource
    Electronic Resource
    Optimum capillary number for oxygen delivery to tissue in man (1987)
    Springer
    Bulletin of mathematical biology 49 (1987), S. 351-361 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The optimum number of total capillaries in the whole human body was estimated from the analysis of the efficiency for oxygen (O2) transport in the vascular-tissue system. We used a tissue model composed of uniform spheres in which O2 diffuses from the capillary located at the centre of each sphere towards the surrounding tissue consuming O2 at a constant rate. The tissue mass supplied by a single capillary was estimated as the area of positive O2 concentration under a given condition of capillary flow and O2 consumption rate. Total tissue mass was determined as the function of the capillary numbern and the total blood flow. On the other hand, the energy cost required to maintain the vascular system withn terminals was assessed by using the minimum volume model (Kamiya and Togawa,Bull. math. Biophys. 34, 431–438, 1972). The efficiency of the entire vascular-tissue system was evaluated by calculating the ratio of total tissue mass/cost function. The result of the calculation using physiological data of cardiac output and O2 consumption for an average human adult during a heavy exercise revealed the maximum efficiency occurring at the capillary number 3.7×1010 which coincided well with its normal range of physiological estimates (3.2×1010–4.2×1010). We concluded that the entire vascular-tissue system is constructed so as to attain the highest efficiency in O2 transport at its maximum activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460125
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  • 8
    Electronic Resource
    Electronic Resource
    Optimal branching structure of the vascular tree (1972)
    Springer
    Bulletin of mathematical biology 34 (1972), S. 431-438 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Optimality in branching structure of the vascular tree was studied. Analysis on its physiological roles as the duct system for blood supply to the capillaries predicted that the vascular tree should be constructed with minimum volume under restriction of determinant pressure, flow and location at the origin and the terminals. Mathematical derivations of this conditional extremum problem yielded some equations expressing the relations between the radii of the branches and their branching angles, which provided numerical solutions for branching points of bi- and poli-terminal minimum volume trees. Comparison of the peritoneal vascular tree in a dog with the minimum volume one computed under the same restrictive conditions showed good agreement in their branching structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476705
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  • 9
    Electronic Resource
    Electronic Resource
    Cytoplasmic microfilaments in endothelial cells of flow loaded canine carotid arteries (1985)
    Springer
    Heart and vessels 1 (1985), S. 65-69 
    Details
    ISSN: 1615-2573
    Keywords: Microfilaments ; Wall shear stress ; Endothelial cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To observe cytoplasmic microfilaments in the endothelial cells of flow-loaded arteries, an arteriovenous shunt was constructed between the common carotid artery and the external jugular vein in 26 dogs. After measuring the flow rates of the arteries, the endothelial layer was examined ultrastructurally with a transmission electron microscope at three different times: 1 week (acute experiments), 2–4 weeks (subacute experiments), and 4–7 months (chronic experiments). Six-to seven-nanometer microfilaments were found forming bundles, which usually ran longitudinally along the long axis of the vessel. In the acute experiments, the bundles increased in the endothelial cells of the flow-loaded arteries. They showed incomplete striation and were mostly located close to the basal cell membrane. In the subacute experiments, they showed an increase with the development of cross-striation. The half-desmosomal structure of the basal cell membrane had developed a close connection to the bundles. In the chronic experiments, the bundles were especially conspicuous around the intercellular junction. Tennanometer microfilaments increased in the endothelial cells of the flow-loaded artery in the subacute and chronic experiments. We consider that the bundles of 6- to 7-nm microfilaments might be structures developed to combat wall shear stress corresponding to actin filament stress fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066350
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  • 10
    Electronic Resource
    Electronic Resource
    Step response analyses of the cardiovascular system and their application to the measurement of systemic and pulmonary vein compliances (1986)
    Springer
    Heart and vessels 2 (1986), S. 91-101 
    Details
    ISSN: 1615-2573
    Keywords: Capillary flow ; Cardiac output ; Vein compliance ; Systemic vein ; Pulmonary vein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A theoretical analysis of the step response in the closed cardiovascular system induced by a sudden shift of the right cardiac output curve predicted that if the relations of the right heart output (COr) and the total systemic capillary flow (CFs) to the systemic venous pressure (Psv) are linear, then the time course ofPsv change will become monexponential with a time constant T given by T=Csv/(Gr + Gs), whereCsv is the systemic vein compliance andGr andGs are the conductances of the transientCOr - Psv andCFs - Psv relationships. A similar prediction was obtained for the time constant T of the pulmonary vein pressure (Ppv) response to the step change in the left cardiac output (COl) curve, pulmonary vein compliance (Cpv) and the conductances of theCol curve, and the pulmonary capillary flow (CFp) curve againstPpv. The actualPsv orPpv changes following sudden alteration of theCOr orCOl curve by inflation and deflation of the balloon in the right or left atrium revealed monoexponential time courses. Semilogarithmic plots of the transient vein pressure changes yielded correlation coefficients of −0.995 ± 0.006 (means ± SD) in 11 curves forPsv and 0.977 ± 0.017 in 16 curves forPpv (P〈0.01). The assumed linearity of dynamicCOr andCOl curves was confirmed by beat by beatCOr - Psv andCOl - Ppv relationships during the step responses, except for the first few beats immediately after the balloon maneuver. The linearity of the dynamicCFs curve was examined by measuringCFs with a double-step balloon maneuver so as to cause rapid equilibrium betweenCOr andCFs at varied moments of the transient process. The correlation coefficient betweenCFs andPsv thus obtained was 0.98 ± 0.04 (P〈0.01). A similar linearity of the dynamicCFp -Ppv relationship was suggested from their steady-state curves. The values ofCsv calculated from the experimental data were 1.70 ± 0.12 ml/mmHg/kg body wt in 11 curves and those ofCpv were 0.13 ± 0.03 ml/mmHg/kg in 15 curves. These results are mostly consistent with those previously reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059962
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