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  • 2005-2009  (9)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Nanocrystalline Tungsten Alloy by Mechanical Alloying and Annealing (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 239-242 
    Details
    ISSN: 1422-6375
    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: Formation of partial nanocrystal and amorphous tungsten alloys was synthesized via crystallization of a completely amorphized tungsten alloy synthesized by mechanical alloying. Structural characterization shows formation of amorphous structure from mechanical alloying of a mixture of elemental tungsten and iron powders after about 150 hours. Partial nanocrystalline phases within theamorphous matrix were formed through annealing the amorphous tungsten alloy at 1075°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.239.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Wear of Mg-5%Al-5%Nd Alloy with Nanocrystalline Grain Size (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 275-280 
    Details
    ISSN: 1422-6375
    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: This paper explores the wear characteristics of nanocrystalline Mg-5%Al-5%Nd,synthesized by mechanical alloying. Pin-on-disc unlubricated sliding wear tests were conducted against a hardened tool-steel counterface under loads of 10 and 30 N, and within a velocity range of 0.2-5.0 m/s. Despite its appreciably superior mechanical properties, the nanostructured alloy did not exhibit the expected improvement in wear resistance when compared to its conventional microngrain-sized counterpart; in fact, the former performed worse when testing conditions became more severe. Scanning electron microscopy (SEM) suggested that extensive delamination in the nanocrystalline alloy was the primary reason for its high wear rates. This wear mechanism was promoted by the presence of MgxNd dispersiods, which were found only within the nanocrystalline material. These compounds likely resulted from the long duration (20 hrs) of ball-milling, whichwas the mechanical alloying technique employed to reduce the grain size of the final alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.275.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Prediction of Defects in PZT Thin Film Using Ab-Initio Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 53-56 
    Details
    ISSN: 1662-8985
    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: This paper reviews our systematic and exhaustive studies on the lead zirconate titanatedoped with dopants using ab initio density functional theory calculations in order to understand themechanisms behind the dopings. Different candidates of dopants were selected by screening theperiodical table of elements. In our studies, group VA, VIA elements (B-site donors), group IIAelements (A-site donors), group IIIB elements (B-site acceptors), and group VB elements (A-sitedonor, B-site acceptor/donors) are investigated as dopants in PZT. We found that there existdifferent mechanisms behind the improved ferroelectric properties, especially the fatigue behaviors.For donors doping, diluted oxygen vacancy concentration and reduced electronic suppression ofpolarization contribute to the fatigue-free behaviors of donor doped PZT. On the other hand, foracceptor doping, acceptor-oxygen-vacancy-acceptor clusters are energetically preferred, whichgreatly reduce the oxygen vacancy mobility and the domain pinning effects. We expect that thisstudy could provide important information for the experiments on PZT-based materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.53.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Non-Metallic Inclusion Size and Residual Stresses on Gigacycle Fatigue Properties in High Strength Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 33-42 
    Details
    ISSN: 1662-8985
    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: Fatigue fracture of some high-strength steels occurs at small defect in the subsurfacezone of a material at low stress amplitude level and in a high-cycle region of more than 106 cycles(gigacycle fatigue life), whereas surface fatigue crack initiation occurs at high-stress amplitude andlow cycles. There is a definite stress range where the crack initiation site changes from a surface toa subsurface defect, giving a step-wise S-N curve or a duplex S-N curve. From the experimentalresults, fatigue fracture mode was classified into three types, such as, surface inclusion inducedfracture mode, subsurface inclusion induced fracture mode without granular bright facet (GBF) areaand that with the GBF, depending on stress amplitude level and stress ratio. The GBF area wasobserved in the vicinity of a non-metallic inclusion at the fracture origin inside the fish-eye ingigacycle fatigue regime. It was made clear from the discussion with fracture mechanics that thetransition of fracture mode was affected by compressive residual stresses on the specimen surface.Fracture-mode transition diagram was proposed through the experimental and theoreticalinvestigation. Also, from the evaluation of the fatigue life based on the estimated subsurface crackgrowth rate from the S-N data, effect of inclusion size on the dispersion of fatigue life wasexplained, and S-N curve for subsurface inclusion-induced fracture depended on the inclusion sizewas provided
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.33.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and Mechanical Properties of Nanostructured Mg-Al-Nd Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 9 (Sept. 2005), p. 93-100 
    Details
    ISSN: 1662-8985
    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/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.9.93.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    116
Applicaton of a Novel Crosslinked Glycosaminoglycan Hydrogel Scaffold Improves Healing in a Rabbit Ear Ulcer Model (2005)
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc.
    Wound repair and regeneration 13 (2005), S. 0 
    Details
    ISSN: 1524-475X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Introduction:  Hyaluronic acid (HA) is a major glycosaminoglycan component of normal dermis and a major component of the matrix synthesized during wound healing. Previous studies have shown that uncrosslinked HA is rapidly degraded and cleared in vivo, limiting its clinical utility. We have used a novel HA hydrogel scaffold that is crosslinked for prolonged bioavailability. It has a porous interior and a smooth surface. This scaffold can also be fabricated with collagen and linked to proteins or DNA to direct cell growth and differentiation. We hypothesized that this novel HA formulation might itself improve wound healing by enhancing cell migration.Purpose:  The present study explored the effects of a crosslinked HA hydrogel on wound healing.Methods:  Using an established model of wound healing, four 7 mm punch wounds were made on each ear of New Zealand rabbits. Each wound was immediately treated with topical application of one of the following: HA hydrogel (n = 26), HA/collagen hydrogel (n = 27), or phosphate-buffered saline (PBS)(n = 16). Wounds were harvested on day 8 for histologic evaluation. Sections were examined for epithelial and granulation tissue ingrowth into wounds.Results:  HA- and HA/collagen-treated wounds showed statistically significant increases in epithelial (p = 0.003 and p = 0.007, respectively) and granulation tissue ingrowth (p = 0.004 and p = 0.01, respectively) when compared to PBS-treated controls.Conclusions:  In the rabbit ear ulcer model, the application of crosslinked HA and HA/collagen hydrogels accelerated wound healing as measured by epithelial and granulation tissue ingrowth.Funding Source: NIH grant: 5R01GM063825–03
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1067-1927.2005.130216t.x
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  • 7
    Electronic Resource
    Electronic Resource
    Genetic Segregation of Spontaneous Erosive Arthritis and Generalized Autoimmune Disease in the BXD2 Recombinant Inbred Strain of Mice (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Scandinavian journal of immunology 61 (2005), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The BXD2 strain of mice is one of approximately 80 BXD recombinant inbred (RI) mouse strains derived from an intercross between C57BL/6J (B6) and DBA/2J (D2) strains. We have discovered that adult BXD2 mice spontaneously develop generalized autoimmune disease, including glomerulonephritis (GN), increased serum titres of rheumatoid factor (RF) and anti-DNA antibody, and a spontaneous erosive arthritis characterized by mononuclear cell infiltration, synovial hyperplasia, and bone and cartilage erosion. The features of lupus and arthritis developed by the BXD2 mice segregate in F2 mice generated by crossing BXD2 mice with the parental B6 and D2 strains. Genetic linkage analysis of the serum levels of anti-DNA and RF by using the BXD RI strains shows that the serum titers of anti-DNA and RF were influenced by a genetic locus on mouse chromosome (Chr) 2 near the marker D2Mit412 (78 cm, 163 Mb) and on Chr 4 near D4Mit146 (53.6 cm, 109 Mb), respectively. Both loci are close to the B-cell hyperactivity, lupus or GN susceptibility loci that have been identified previously. The results of our study suggest that the BXD2 strain of mice is a novel model for complex autoimmune disease that will be useful in identifying the mechanisms critical for the immunopathogenesis and genetic segregation of lupus and erosive arthritis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0300-9475.2005.01548.x
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  • 8
    Electronic Resource
    Electronic Resource
    Microstructural evolution in direct laser sintering of Cu-based metal powder (2005)
    Bingley : Emerald
    Rapid prototyping journal 11 (2005), S. 74-81 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Purpose - To identify the effects of laser scan speed and scan spacing on surface morphology, microstructure and structure evolution in direct laser sintering of Cu-based metal powder. Design/methodology/approach - Scanning electron microscope, differential thermal analyser (DTA) and X-ray diffractometer were used to examine the microstructure of the sintered parts. Findings - It was found that the decrease of the scan speed and scan spacing could lead to densification due to solute-reprecipitation mechanism. The formation of oxide Cu2O is sensitive to the scan spacing due to the lack of Cu3P protection under the re-heating condition if using small scan spacing. Furthermore, the result shows that there exist two mechanisms in determining the phosphor distribution. During the laser sintering, concentration diffusion acts as the main mechanism at a fast scan speed and a large scan spacing while solute-reprecipitation acts as the main mechanism at a low scan speed and small scan spacing. Originality/value - This paper discloses the influence of process parameters on microstructure evolution and the mechanism of densification in direct laser sintering Cu-based metal powder. It offers practical help to the researchers who are interested in direct laser sintering metal powder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540510589430
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  • 9
    Electronic Resource
    Electronic Resource
    Theoretical and Practical Considerations of Grain Refinement of Mg-Al Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 299-302 
    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: The fundamentals of grain refinement are reviewed with particular focus on magnesium alloys. This is followed by considerations of the theoretical and practical aspects of grain refinement of Mg-Al alloys by carbon-based grain refiners. Finally, experimental results using Al4C3 as a potential grain refiner are presented and discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.299.pdf
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