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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of sequential extraction for speciation of trace metals in model soil containing natural minerals and humic acid (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 802-807 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00054a026
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Research on the Hybrid Fiber-Reinforced Microstructure of Chafer Cuticle (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 111 (Apr. 2006), p. 135-138 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In this paper, the microstructure of chafer cuticle is observed with a scanning electron microscope (SEM). The observation shows that the insect cuticle is a kind of biocomposite with hybrid structural characteristic of various chitin fibers embedded in protein matrix. The reinforced chitin fibers vary in size, shape, property and distribution, which are related to their location in the cuticle. Near the surface of the cuticle, the chitin fibers are smaller, stiffer, more circular, andthe orientations of the chitin-fiber plies are various. A kind of helicoidal layup is found. The dependence of fracture strength on the fiber diameter and the dependence of fracture toughness on the parameters related to helicoidal layup are experimentally investigated. It shows that the smaller fiber and the helicoidal layup endow the surface of the cuticle with higher fracture strength and toughness
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.111.135.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Research of Herringbone Structure of Fragum Unedo Shell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1273-1276 
    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 microstructure of a Fragum unedo shell is observed with a scanning electronicmicroscope (SEM). It shows that the shell is a kind of bio-ceramic composite consisting ofaragonite and collagen protein layers. The observation also shows that the aragonite layers consistof thin and long aragonite sheets. A kind of particular herringbone structure of the aragonite sheetsis found. In the structure, the aragonite sheets in an arbitrary aragonite layer make a crossed angleagainst that in its neighboring aragonite layers. Based on the SEM observation the comparativeexperiments in the maximum pull-out forces of both the herringbone and conventional 0°-structuresare conducted. It shows that the maximum pull-out force of the herringbone structure is markedlylarger than that of the 0°-structure, and the larger the crossed angle is, the more the maximumpull-out force of the herringbone structure will increase compared with that of the 0°-structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1273.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Dielectric Properties of Boron Nitride-Aluminium Nitride Composites Prepared by Spark Plasma Sintering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 796-798 
    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: In this study, hexagonal Boron Nitride-Aluminium Nitride composites were prepared by sparkplasma sintering at 1700°C[removed info]for 4 min under the pressure of 25 MPa, varying the amount of BN from 0 to30 wt.%. The dielectric constants and losses of the samples were measured from 100 Hz to 1 MHz at roomtemperature, and the results show that with the increment of BN content, the dielectric constants andlosses of AlN-BN composites decrease. When the BN content is 20 wt.%, the dielectric constant and lossof the composites at 1 MHz are 6.18, 2.1 × 10-3 respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.796.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Sheet-Layer Microstructure and Toughness Mechanism of Shinbone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 1129-1132 
    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: Most structural materials existing in nature take the form of composite. After centuries’evolution, these materials gain highly optimized microstructures and performances. In this work, akind of natural biomaterial, shinbone, is observed with a scanning electron microscope (SEM). Theobservation result shows that the bone is a bioceramic composite consisting of hydroxyapatitelayers and collagen matrix. The observation also shows that the hydroxyapatite layers are composedof hydroxyapatite sheets. The hydroxyapatite sheets are of thin and long shape and paralleldistribution along the orientation of the maximum main stress of the bone. The shape anddistribution of the hydroxyapatite sheets may endow the bone with favorable fracture toughness,which is analyzed and illuminated based a representational model of the hydroxyapatite sheets andthe idea of maximum pullout force
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.1129.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Observation on Hydrophilidae Cuticle and Analysis of Maximum Pullout Force of Branched Fiber (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 901-904 
    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: Most structural materials existing in nature take the form of composite. After centuries’evolution and modification, these natural materials gain highly optimized structures and prominentperformances. The SEM observation on the cuticle of Hydrophilidae shows that the cuticle is abiocomposite reinforced with chitin fibers. The chitin fibers are embedded in a protein matrix of thecuticle in the form of layers. A kind of revolving fiber layup was found. Observation also shows thatthere is a kind of special branched fiber consisting of a long fiber and many short fibers. Themaximum pullout force of the branched fiber is analyzed. The results show that the maximumpullout force of the branched fiber is distinctly larger than that of ordinary straight fiber
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.901.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Research of the Herringbone Microstructure of Rufescens’s Shell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 905-908 
    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: Molluscan shell is strong, stiff, tough and shows an erose fracture surface when it isbroken. In this research, the SEM observation on a Rufescens’s shell shows that the shell consists ofaragonite layers and collagen matrix. Each aragonite layer is parallel to the surface of the shell andconsists of many thin aragonite sheets. These aragonite sheets are perpendicular to the layer wherethey are located. The observation also shows that the direction of the sheets in different layer isvarious and a kind of herringbone distribution is found. The maximum pullout force of theherringbone distribution is analyzed based on its representative model, and it shows that theherringbone distribution can markedly increase the pullout force of the distribution and improve thefracture toughness of the shell
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.905.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Lambdoidal Layup of Aragonite Sheets in Conch Shell (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2532-2535 
    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 SEM observation on a conch’s shell shows that the shell is a kind of laminated bioceramiccomposite composed of aragonite layers and organic matrix. Each aragonite layer is parallel with thesurface of the shell and consists of many thin aragonite sheets. These aragonite sheets are perpendicular tothe layer where they are located. The observation also shows that the orientations of the sheets in differentlayers are different and these aragonite sheets compose various layups. A kind of lambdoidal layup isfound. The maximum pullout force of the lambdoidal layup is analyzed based on its representative model.The result shows that the lambdoidal layup can markedly increase the pullout force of the layup andimprove the fracture toughness of the shell
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2532.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Research of Nanostructure of Bivalva Shell (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 83-86 
    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: Molluscan shells is a natural ceramic composite with excellent fracture strength andfracture toughness, which are attributed to their unique microstructures. Sanning electron microscope (SEM) observation on Bivalva shell showed that the shell consists of laminated aragonite and organic layers. These aragonite and organic layers are provided with the scale and characteristics of nanometer. The effect and function of these nanometer structures were analyzed based on Griffith criterion and energy-dissipation idea. The higher fracture strength and fracture roughness of bionanocomposite-molluscan shell were well explained with nanometer viewpoint
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.83.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Research on the Layered Microstructure of Shankbone (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 785-788 
    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: Bone is a kind of biomaterial in nature. It behaves favorable strength, stiffness andfracture toughness which are closely related to its fine microstructure. SEM observation on ashankbone shows that the bone is a kind of natural bioceramic composite consisted ofhydroxyapatite layers and collagen matrix. The observation also shows that the hydroxyapatitelayers consist of many hydroxyapatite sheets and are arranged in a parallel distribution. The fracturetoughness of the bone is analyzed based on the representative model of the microstructure of thebone and the idea of maximum pullout force. The analytical result shows that the long and thinshape as well as the parallel distribution of the hydroxyapatite sheets improves the maximumpullout force of the sheets and the fracture toughness of the bone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.785.pdf
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