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  • 1
    Electronic Resource
    Electronic Resource
    Improvement in the Sensitivity of the Response of Diamond Thin Films to X-Ray (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1718-1721 
    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: Due to some inferior performance of Chemical Vapor Deposition (CVD) diamond dosimeters,their applications are somewhat limited. The quality of diamond films was improved using MicrowavePlasma CVD (MWPCVD) by the modified processes such as cyclic deposition and in-situ plasmapost-treatment. The simple radiation dosimeters were fabricated in a sandwich configuration. Influence ofpurity and orientation of the diamond films on the sensitivity of the dosimeters was studied. The resultsindicate that the radiation dosimeters have high sensitivity to X-ray and the response of the devices islinear with the X-ray flux. The higher the purity of films is, the higher the resistivity and sensitivity are.The dosimeter based on [100] film has higher sensitivity than that based on [111] film. The dosimeterbased on films prepared by cyclic deposition has higher sensitivity than that based on films prepared bythe conventional deposition. The characterization of the response to X-ray also shows that in-situ oxygenplasma post-treatment leads to the higher sensitivity of dosimeters compared with in-situ nitrogen,hydrogen plasma post-treatments
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1718.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Assessment of the Surface Morphology of Diamond Film Based on Fractal (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2543-2545 
    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 surface morphology of film material directly affects its physical performance. It is of greatsignificance for finding out its prospective physical performance to characterize the surface morphologyof film material. It is hard to characterize them with some conventional methods. The surface morphologyof film material was described from the fractal point of view, and the dimension was correlated with theresistivity of material. The [100]-orientated diamond film was primarily investigated. The results showthat the greater the crystal grain is, the more uniform and regular the orientation is; and the more compactthe arrangement is, the greater the fractal box dimension is. Moreover, when fractal box dimensions werewithin a certain range approximately from 2.92 to 2.97, it presents positively correlative relation with thelogarithm of resistivity, Log(ρ), which resembles the Logistic curve. However, when the other dimensionsare beyond the range mentioned above, resistivity doesn’t change with the increase in dimensions offractal. This study will conduce to illustrating the relationship between the structure of crystal exemplifiedby arrangement and physical performance as well as material preparation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2543.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative Evaluation for New Bone Growth of Bone Repairing Biomaterial Based on Color Image Segmentation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2493-2496 
    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: Quantitative evaluation of repairing effect of bone grafting material is one of the essentialstudying subjects. However, traditional evaluation methods are subjective and qualitative. In this paper,the region of new bone from a bone repairing biomaterial planted image is extracted based on color imagesegmentation and then statistically analyzed to evaluate the property of bone grafting materialquantitatively. HSI color model, which corresponds with people’s vision system for color is used toachieve ideal segmental results and effective utilization of color information. The S and I variable areused as thresholding condition for image segmentation, thereby obtaining the area of new bone. The effectof BMP contained in BMP/α-TCP is estimated furthermore. Experimental results show that the compositeBMP/α-TCP induce more bone than pure α-TCP in virtue of BMP. This study provides theoretical andexperimental suggestions for clinical applications of BMP/α-TCP
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2493.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Thermal Stability of Al-Mg-Mn Alloys by Equal Channel Angular Pressing at Elevated Temperature (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 929-932 
    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: Two Al-Mg-Mn alloys having similar compositions but with and without Zr addition weresubjected to equal channel angular pressing (ECAP) at 350℃ using route BC and a 90° die, followedby water quenching or air cooling. A series of annealing experiments were conducted at varioustemperatures from 400℃ to 460℃ on the water-quenched alloys. Fine structures with grain size ofapproximately 1~2μm were obtained in these alloys after 6 passes. The water-quenched alloycontaining Zr exhibited finer structure compared with the Zr-free alloy in the same cooling condition,which was due to the existence of Al3Zr dispersoids. And in the air cooling condition, it was foundthat in the Zr-free alloy static recovery occurred, and in partial regions some small grains withoutdislocation inside appeared suggesting the occurrence of static recrystallization. This demonstrated afairly restored structure. However, the microstructure of the alloy containing Zr kept stable during theair cooling process. In addition, in the annealing experiments, secondary recrystallization took placein the Zr-free alloy annealed at 410℃ for 1h, while the alloy containing Zr kept stable up to 460℃.TEM observation showed that the Al3Zr dispersoids pinned the motion of the grain boundaries,thereby the secondary recrystallization and grain growth were inhibited
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.929.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    An acoustoelastic method for measuring residual stresses in slightly orthotropic materials (1991)
    Springer
    Acta mechanica solida Sinica 4 (1991), S. 355-362 
    Details
    ISSN: 0894-9166
    Keywords: acoustoelasticity ; ultrasonics ; residual stress measurement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An acoustoelastic method for residual stress measurement in slightly orthotropic materials by using ultrasonic longitudinal and shear waves is presented. A shear transducer with small vibrator 2 × 2mm2 is developed and described, and the measurement of 2-D residual stresses in a seam welded plate was carried out by this method with the shear transducer developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207584
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  • 6
    Electronic Resource
    Electronic Resource
    Restrictions on Short-Selling and Spot-Futures Dynamics (1999)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd
    Journal of business finance & accounting 26 (1999), S. 0 
    Details
    ISSN: 1468-5957
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Recent lifting of short-sales constraints in Hong Kong provides an important opportunity to examine whether such restrictions affect the dynamic relationship between index futures and its underlying spot. The results show that the two prices have become more closely integrated without the restrictions. Adjustments to long-run equilibrium are accomplished more through index futures; however, the spot index has played an increasingly more important role in the lead-lag relationship after the deregulation. Market conditions, spot trading volumes, relative futures trading volumes and institutional participation also affect the dynamic relationship.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1468-5957.00254
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  • 7
    Electronic Resource
    Electronic Resource
    Studies of the sulfonation of hypocrellin A and the photodynamic actions of the product
    Amsterdam : Elsevier
    Journal of Photochemistry and Photobiology B: Biology 17 (1993), S. 195-201 
    Details
    ISSN: 1011-1344
    Keywords: ESR spectra ; ESR-spin trapping ; Hypocrellin A ; photo-oxidation ; photodynamic action ; sulfonation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1011-1344(93)80013-Y
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the chelation of hypocrellin A with aluminium ion and the photodynamic action of the resulting complex
    Amsterdam : Elsevier
    Journal of Photochemistry and Photobiology B: Biology 22 (1994), S. 219-227 
    Details
    ISSN: 1011-1344
    Keywords: Active oxygen ; Aluminium ion ; Chelation ; Hypocrellin ; Photodynamic efficiency
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1011-1344(93)06973-7
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  • 9
    Electronic Resource
    Electronic Resource
    Foreign Equity Ownership and Information Asymmetry: Evidence from Japan (2004)
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd.
    Journal of international financial management & accounting 15 (2004), S. 0 
    Details
    ISSN: 1467-646X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Using a large sample of Japanese firms, we investigate whether the level of foreign ownership in a firm is inversely related to information asymmetry between firm (managers) and market (outside investors). Since information asymmetry is not directly observable and, thus, is difficult to measure empirically, our analysis focuses on the link between foreign shareholding and a measurable consequence of information asymmetry; that is, the timing and magnitude of intertemporal return-earnings associations. The empirical results support our hypothesis, and subsequent tests based on residual foreign ownership show that the relation between foreign ownership and information asymmetry is robust to the addition of various control variables such as market capitalization and cross-corporate holdings. We also show that foreign investors tend to avoid stocks with high cross-corporate holdings. Overall, our results suggest that foreign (institutional) investors are likely to be efficient processors of public information and are attracted to Japanese firms with low information asymmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-646X.2004.00107.x
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  • 10
    Electronic Resource
    Electronic Resource
    Direct Current-Voltage Failure of Lead-Based Relaxor Ferroelectrics with Silver Doping (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effect of silver doping on the DC-voltage resistance failure of lead-based relaxor ferroelectrics was investigated via temperature-humidity-bias (THB) testing, scanning electron microscopy, X-ray diffraction spectroscopy, and electrical measurements. The failure rate of silver-doped specimens was found to increase significantly with the doping level during the THB test. However, some degraded specimens can partially recover their electrical properties after a few days of storing in natural conditions. X-ray diffraction analysis showed that silver could be incorporated into the perovskite lattice in the range of silver contents studied. The presence of an inner-bias field in the degraded ceramics was first demonstrated through hysteresis property measurement. Based on these results, it was inferred that the accumulation of oxygen vacancies under DC-voltage should be responsible for the inner-bias field, which consequently resulted in the increase of electronic defects in the ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03572.x
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