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  • 1
    Electronic Resource
    Electronic Resource
    Biological Efficacy of Modified Structure of Polymer Surfaces for Bone Substitute (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 707-710 
    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: Hydroxyapatite (HA) coatings were introduced onto Poly L-lactic Acid (PLLA) polymerin a controlled manner by immobilized urease method with a shortened precipitation time.Osteoblastic-like cellular responses to the composite were examined in terms of cell proliferation,differentiation and cell morphology, as well as the expression of bone-associated genes. The cellsexhibited higher cellular proliferation at 2 and 4 days on the HA/PLLA composite compared toPLLA scaffold, while no significant difference was observed later at 6 days. The alkalinephosphatase (ALP) activity by cells at 7 days was statistically higher on HA/PLLA scaffold than onPLLA. Moreover, the gene expression of ALP and osteocalcin (OC) was up regulated on HA/PLLAcomposite by RT-PCR analysis. The preliminary study suggested that the use of the controlledmodification of hydroxyapatite coating on PLLA scaffold to produce HA/PLLA composite mightenhance cellular activity, indicating the potential use for bone substitute in tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.707.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal-Grain Refinement of Materials under an Ultra-Strong Gravitational Field (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 639-642 
    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: In this study, we investigate the crystalline states and conditions for thegrain-refinement of Bi70Sb30 (at.%) alloy. It was considered under an ultra strong gravity field, thecrystals were fine-grained from the primary grain sizes of several mm to several tens of mm, andthe crystal growth followed with formation of graded-composition structure due to sedimentationof atoms along the direction of gravity. It was found that for the crystal-grain refinement inBi70Sb30 alloy the minimum gravitational field and the minimum time duration were at least160,000 G and 10 hours, respectively at about 200 ºC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.639.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    A numerical study of ionospheric profiles for mid-latitudes (1995)
    Springer
    Annales geophysicae 13 (1995), S. 551-557 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper presents a numerical model and results for the mid-latitude ionospheric profile below the peak of the F2-layer. The basis of the model is the solving of equations for four ionic species O+, NO+, O+2 and N+2, as well as the meta-stable O+(2D) and O+(2P). Diffusion and wind-induced drifts and 21 photo-chemical reactions are also taken into account. Neutral atmospheric density and temperature are derived from the MSIS86 model and solar extreme ultraviolate irradiance from the EUV91 model. In an effort to obtain a more realistic ionospheric profile, the key point at foF2 and hmF2 is fitted from the simulation to observations. The model also utilizes the vertical drifts derived from ionosonde data with the help of the Servo model. It is shown that the ionospheric height of peak can be reproduced more accurately under the derived vertical drifts from the Servo theory than with the HWM90 model. Results from the simulation are given for Wuchang (30.5°N, 114.4°E) and Wakkanai (45.6°N, 141.7°E), showing the profile changes with season and solar activity, and the E-F valley structure (the depth and the width). This simulation also reveals the importance of meta-stable ions and dynamical transport processes on the formation of the F1-ledge and F1-F2 valley.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-995-0551-8
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  • 4
    Electronic Resource
    Electronic Resource
    The Progress on Study of Isotope Effects in High T〈sub〉C〈/sub〉 Copper Oxide Superconductors (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1957-1960 
    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: Through the review of the correlation on the isotope effects research and superconductivitymechanism research as well as the progress on the study of the isotope effects in the high Tc copperoxide superconductors, we have found the fundamental factors that cause the different changes of theisotope effect value in different dope region in high Tc cupper oxide superconductors. We point thehigh-temperature superconductivity mechanism possible origin phonons mediation electrons
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1957.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Metastable Transition-Metal System Bulk Alloys Prepared by MA and Shock Compression (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1937-1942 
    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: Mechanical alloying (MA), super cooling process, etc. have been used to prepareamorphous phases, metastable solid solutions, nanocrystals, and so on. It is important to consolidatethese powders for evaluating the physical properties, and for applications. On the other hand, shockcompression can be used as an effective consolidation method for metastable material powderswithout recrystallization or decomposition. We had prepared metastable transition-metal systembulk alloys and compounds (Fe-Co, Fe-Cu, Fe-W, Co-Cu, Sm-Fe-N systems, etc) by using MA andshock compression. The Fe-Cu and Co-Cu metastable solid solutions showed a fit curve to theSlater-Pauling one. The Co-Cu metastable solid solution bulk alloy showed a magneto-resistance.The Fe-Co fine-grained bulk alloys show the higher coeicivity than that of molten alloy. In thispaper, the preparation and magnetic properties of the metastable alloys (Fe-Co, Fe-Cu, Co-Cusystems) are reviewed, and the applications to materials science and engineering are discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1937.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Formability of AZ31 Magnesium Alloy Processed by Differential Speed Rolling (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 395-398 
    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: An AZ31 (Mg-3Al-1Zn-0.35Mn in mass%) alloy sheet exhibiting the inclination of thebasal plane from the rolling plane at about 15º, was fabricated by a DSR processing with a roll speedratio of 1.167. Compared with the normal rolled sheets, the DSR processed sheets showed a lower0.2% proof stress, a larger elongation, a smaller r-value and a larger n-value. The Erichsen value atroom temperature significantly increased from 2.2 to 3.1, and the deep drawability also improved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.395.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Influences of Rolling Conditions on Texture and Mechanical Properties of AZ31 Magnesium Alloy Processed by Differential Speed Rolling (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 287-290 
    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: It was reported that the cold and warm press formability of the magnesium alloy wasimproved by the application of a differential speed rolling (DSR). However, it can be consideredthat the microstructure and the texture of the DSR processed sheets greatly change with the rollingconditions. In this study, commercial AZ31B magnesium alloy extrusions were processed by DSRat a differential speed ratio of 1.167 and a reduction per pass of 10% or less, and the effects of therolling temperature, the number of rolling passes and reversal of the rolling direction on texture andmechanical properties were examined. As a result, it was found that the optimal rolling temperaturein terms of the workability and formability of the material was 573 K. And the elongation andformability were maximal in sheets processed by 4–6 passes of DSR. Moreover, reversing the sheardirection made the microstructure more homogeneous and finer than unidirectional shear, andimproved the mechanical properties and formability. This improvement was greater in sampleswhere the shear direction was reversed once in the middle than where it was reversed for each pass
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.287.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of Differential Speed Rolling on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1759-1763 
    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: A differential speed rolling (DSR) processing with a roll speed ratio of 1.167 was carriedout on an AZ31 alloy for investigating the effects of DSR on microstructure, texture and mechanicalproperties. The DSR processed sheet showed unidirectional shear bands with a small grain size of5.5 μm inclining to the rolling direction, and the basal plane tended to incline at about 15º from therolling plane toward the rolling direction. Compared with the normal rolled sheet, the DSRprocessed sheets showed a lower proof stress and a larger elongation with an increase from 21% to26% in the rolling direction. The proof stress increased and the elongation decreased with theangle between the tensile direction and the rolling direction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1759.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of Manganese on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Processed by Differential Speed Rolling (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 283-286 
    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: A DSR processing with a roll speed ratio of 1.08 was carried out on an AZ31 alloys withMn additions of 0, 0.2, 0.4 and 0.6 wt.% for investigating the effects of Mn on the microstructuralevolution and mechanical properties. The amount of the Al-Mn compounds increased with increasingthe Mn content. Compare with the DSR processed sheet without Mn addition with a homogeneousgrain size, those with Mn additions exhibited an inhomogeneous microstructure due to the appearanceof the shear bands comprising the small grains around 5 μm. The Mn addition exhibited a significanteffect in grain refinement even for a low content of 0.2 wt.%, which reduced the average grain sizefrom about 25 μm to 10 μm. The Mn addition resulted in the significant increases in the tensilestrength and the 0.2% proof stress by about 25 MPa and 40 MPa, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.283.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Recycling of 6061 Aluminum Alloy Cutting Chips Using Hot Extrusion and Hot Rolling (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 443-446 
    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: Possibilities of the consolidation process using hot extrusion and subsequent hot rollingwere investigated in order to recycle the cutting chips of the aluminum alloy efficiently. For therolling process, differential speed rolling (DSR) was also applied in addition to normal rolling.Several kinds of cutting chips with different size and cleanliness were collected through turning 6061aluminum alloy round bars. From these cutting chips, recycled material sheets were produced undervarious processing conditions via hot extrusion and subsequent hot rolling. Non-recycled materialsheets were also prepared for comparison. All samples were characterized by optical microscopy,SEM(EBSP), X-ray texture analysis, tensile test and corrosion test. As a result, it was found that therecycled material sheets produced under optimum processing conditions had smaller grain sizes thanthose of the non-recycled ones, therefore the mechanical properties and the corrosion resistance of therecycled material sheets were almost comparable to those of the non-recycled ones. Moreover,concerning the DSR processed sheets, the traces of the chip interface, which were clearly observed inthe normally rolled ones, almost disappeared, and the appearances were remarkably improved. Thenthe DSR processed sheets significantly surpassed the non-recycled ones in the tensile properties andthe corrosion resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.443.pdf
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