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  • 1
    Electronic Resource
    Electronic Resource
    Highly stable surfaces of Nd1Ba2Cu3Oy single crystals (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2035-2037 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single crystals of Nd1Ba2Cu3Oy (Nd123) high-temperature superconductors have been studied using an ultrahigh vacuum scanning tunneling microscope/spectroscopy system at room temperature. A square lattice with average lattice spacings of 4×4 Å2 has been observed on the surfaces of the single crystals without any surface protections or treatments. The as-prepared surfaces are found to be terminated by the CuO chain layer. Several surface defect structures presumably caused by the oxygen depletion are revealed. Among them, an one dimensional structural modulation with period of 1.5 nm along b axis is seen, which is suggested to be created by the ordering of the oxygen vacancies. The surfaces of Nd123 single crystals are proved to be highly clean and stable in air. Our results indicate that Nd123 single crystals are good materials for surface sensitive scientific researches and device applications. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121256
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence of a new magnetic flux pining center in Nd1Ba2Cu3Oy single crystals (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 770-772 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly flat, clean, and stable surfaces of as-prepared Nd1Ba2Cu3Oy (Nd123) single crystals have been studied using an ultrahigh vacuum scanning tunneling microscope/spectroscopy (UHV-STM/STS) system. The results of large area STM scans together with the results of STS measurements, magnetization loops measured at several temperatures below Tc, and critical current density measurements reveal the presence of a new magnetic flux pinning center in Nd123 single crystals prepared in a reduced oxygen partial pressure. This pinning center is more conductive on the surface than the matrix and has a size ranging from several to several tens of nanometers as seen by STM. Similar pinning center may be introduced to other high temperature superconductors to increase their critical current densities in an applied magnetic field. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118262
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  • 3
    Electronic Resource
    Electronic Resource
    Scanning probe microscopy of NdBa2Cu3Ox thin film surfaces (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2155-2157 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found that NdBa2Cu3Ox (NBCO) thin films, fabricated by the laser ablation process, have highly stable and smooth surfaces. Clear spiral patterns with 4–5 terraces are observed all over the film area with an atomic force microscope (AFM) operating in air. We have also obtained atomically resolved image of the spiral terraces using AFM, and also using ultrahigh vacuum scanning tunneling microscope. This study suggests that NBCO film is a good candidate for device applications. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114751
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  • 4
    Electronic Resource
    Electronic Resource
    Vendor development and control:its linkage with demand chain (2004)
    Bingley : Emerald
    International journal of physical distribution and logistics management 34 (2004), S. 269-285 
    Details
    ISSN: 0960-0035
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Explains the linkage of vendor development and control as an integral factor of value on demand chain logistics. Presents a comparison of the traditional purchasing function with vendor development in. Provides the missing link of value chain by demand chain. Describes the supplier integration approach as a competitive corporate strategy in a conceptual synthesis by linking demand chain with order management, marketing, sales, channel management, pricing, service, etc. Analyses the vendor development strategy from three key dimensions. Further discusses the advantages of vendor development in the short run, bottom line performance increase, and long run revenue enhancing the value of an organisation. Also discusses the impact on demand chain from the costing point of view with elaboration on cost and pricing activities involving total cost of ownership, understanding supplier costs and target costing with target pricing commensurate with expectations of customers. Concludes with an emphasis on the importance of providing e-learning and upgrading the skills of staff in order to expedite the adoption of vendor integration strategy in its demand chain logistics management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09600030410533583
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Related Histological Alterations of Engineered Tendons In Vivo (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 11-14 
    Details
    ISSN: 1013-9826
    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 purpose of this research is to find out the interaction between histological alterations and mechanical properties of engineered tendon implanted in situ. Defects of 0.5cm-1.0cm were made at deep flexor tendons by surgical procedure. Engineered tendons using degradable scaffolds polyglytic acid (PGA) mesh and tendon cells were implanted to repair the defects. Chickens were killed respectively at 2 weeks, 4 weeks, 6 weeks, and 8 weeks after surgery. The implants weretaken out for histological examination, biomechanical test, and collagen synthesis assay. The results showed that after surgery the PGA scaffolds degraded fast and took precedence of collagen synthesis. There were not enough amount and maturation of the collagen fibers of the new tendon at 2-8 weeks after surgery. The biomechanical properties of new tendons were less than those of the normal tendon. Therefore, it is necessary to construct engineered tendons with better degradationrate of scaffolds and suitable biomechanical stimulation so that more collagen synthesis and better biomechanical properties of new tendons can be developed early after implantation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.11.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A New Construction Model of Engineered Tendons under Mechanical Strain In Vitro (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 19-22 
    Details
    ISSN: 1013-9826
    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/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.19.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical Composition and Mechanical Properties of Bio-Derived Compact Bone Scaffolds (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 891-894 
    Details
    ISSN: 1013-9826
    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: To compare the chemical composition and mechanical properties of the bio-derivedcompact bone scaffold (BDCBS) with the normal compact bone in human. Human compact bone were harvested and divided into control and experimental group. For the latter, BDCBS was prepared with physical and chemical methods. The major components (calcium, phosphorus, collagen protein) and heavy metal contents of the two groups were determined with biochemical assay. Histological examinations were performed to investigate the structure. Cylindroids from thenormal compact bone and the BDCBS (6 in each group) were tested under compression. There was no significant difference between the two groups for major components. In addition, there were a few amounts of heavy metal components in BDCBS and control. Histological examinations confirmed the acellular structure in the BDCBS. Results from mechanical testing showed thecompressive strength, elastic modulus and ultimate strain (193MPa, 13.76GPa, and 2.3%) of the BDCBS were a bit lower than those (205MPa, 15.67GPa, and 2.5% respectively) of control, but the differences were not statistically significant. In conclusion, there are almost the same matrix structure and composition with similar biomechanical properties between the BDCBS and thecontrol. These results may underscore the potential of the BDCBS in tissue engineering bone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.891.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Surface Properties and Cytocompatibility of Bio-derived Compact Bone as Scaffolds for Tissue Engineering Bone (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 895-898 
    Details
    ISSN: 1013-9826
    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: Many scaffolds are candidates for use in tissue engineering approaches for the repair or replacement of bone defects. Among the scaffolds tested for tissue engineering of bone, bio-derived compact bone scaffold (BDCBS) containing mineralized collagen fibers, phosphorus and calcium, as natural bone does, is one of the most promising candidates for this purpose. To analyze howappropriate the BDCBS would be for tissue engineering purposes, we established an in vitro characterization system to describe the surface properties and cytocompaibility of the scaffold. Surface properties were determined by means of scanning electron microscope and scanning probe microscope. The surface phase was examined with the Fourier transform infrared spectroscopy andX-ray diffraction. Osteoblasts from human embryos were isolated from the periosteum. After in vitro expansion, cells were cultivated on the BDCBS. Real-time cell culture was used to monitor the growth process of cells seeded on the scaffold. Using this in vitro characterization, we were able to demonstrate effective growth of osteoblasts on this scaffold. In summary, BDCBS has the surfacecharacterization similar to a natural bone and also has strong affinity for osteoblast attachment and proliferation, indicating the potential as an effective scaffold used in tissue engineering bone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.895.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Surface electronic properties and morphology of as-grown c-axis orientated Y1Ba2Cu4O8 thin films (1995)
    Springer
    Journal of materials science 14 (1995), S. 1738-1741 
    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/BF00270993
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  • 10
    Electronic Resource
    Electronic Resource
    The As-prepared surfaces of C-axis-oriented Nd1Ba2Cu3Oy thin films characterized using scanning probe microscopes (1996)
    Springer
    Journal of superconductivity 9 (1996), S. 637-645 
    Details
    ISSN: 1572-9605
    Keywords: Nd1Ba2Cu3Oy thin film ; scanning probe microscope ; surface stability ; morphology ; atomic images
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Recently, superconducting Nd1Ba2Cu3Oy (Ndl23) thin films with high superconducting transition temperature (T c) have been successfully fabricated at our institute employing the standard laser ablation method. In this paper, we report the results of surface characterization of the Nd123 thin films using an ultrahigh vacuum scanning tunneling microscope/spectroscopy (UHV-STM/STS) and an atomic force microscope (AFM) system operated in air. Clear spiral pattern is observed on the surfaces of Nd123 thin films by STM and AFM, suggesting that films are formed by two-dimensional island growth mode. Contour plots of the spirals show that the step heights of the spirals are not always the integer or half-integer number of thec-axis parameter of the structure. This implies that the surface natural termination layer of the films may not be unique. This result is supported byI-V STS measurements. The surface morphology of the Nd123 thin films is compared with that of thec-axis-oriented Y1Ba2Cu3Sy thin films. Surface atomic images of the as-prepared Nd123 thin films are obtained employing both STM and AFM. STS measurements show that most of the surfaces are semiconductive. The results of STS measurements together with the fact that we are able to see the surface atomic images using scanning probe microscopes suggest that exposure to air does not cause serious degradation to the as-prepared surfaces of Nd123 thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728247
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