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  • 1
    Electronic Resource
    Electronic Resource
    Spark Plasma Sintering of Bismuth Titanate Ceramics (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), 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: Spark plasma sintering (SPS) was used to fabricate bismuth titanate (Bi4Ti3O12) ceramics. The densification, microstructure development and dielectric properties were investigated. It was found that the densification process was greatly enhanced during SPS. The sintering temperature was 200°C lower and the microstructure was much finer than that of the pressureless sintered ceramics, and dense compacts with a high density of over 99% were obtained at a wide temperature range of 800°–1100°C. Dielectric property measurement indicated that the volatilization of Bi3+ was greatly restrained during SPS, resulting in an unprecedented low dielectric loss for pure Bi4Ti3O12 ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00256.x
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of amniotic stem cell lines with potential for therapy (2007)
    [s.l.] : Nature Publishing Group
    Nature biotechnology 25 (2007), S. 100-106 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Stem cells capable of differentiating to multiple lineages may be valuable for therapy. We report the isolation of human and rodent amniotic fluid–derived stem (AFS) cells that express embryonic and adult stem cell markers. Undifferentiated AFS cells expand extensively without feeders, double ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nbt1274
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  • 3
    Electronic Resource
    Electronic Resource
    Li2AlB5O10 (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1010-1011 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A new compound, dilithium aluminium pentaborate, Li2AlB5O10, has been synthesized by solid-state reaction and its structure determined by single-crystal X-ray diffraction. This compound is composed of [B5O10]5− groups linked by AlO4 tetrahedra. The [B5O10]5− group consists of two hexagonal B–O rings perpendicular to each other connected by tetracoordinated boron. All the B–O rings in this structure can be divided into two groups, with one group approximately parallel and the other perpendicular to the c axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101006205
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  • 4
    Electronic Resource
    Electronic Resource
    Functional analysis of the ver gene using antisense transgenic wheat (1998)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 102 (1998), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The function of ver203, a gene related to vernalization in winter wheat, was investigated by expression of a complementary DNA as an antisense RNA in transgenic plants. A verc203:gus fusion-expression plasmid was constructed in pBI221, which contains a CaMV (cauliflower mosaic virus) 35S-promoter, a gus gene and a nos terminator. The construct was then introduced into the plant by the pollen-tube pathway. The results showed that heading was strongly inhibited in 6 of 326 vernalized antisense transgenic winter wheat plants, until both the vernalized control winter wheat and sense transgenic plants ripened. The hybridization analysis of DNA, amplification of the insert DNA sequences with PCR, northern blot analysis with double- and single-stranded probes, and detection of GUS activity by X-gluc assay gave strong positive results. This suggests that the VER203 protein plays an important role in controlling heading and flower development in winter wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.1998.1020112.x
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  • 5
    Electronic Resource
    Electronic Resource
    Three Dimensional Numerical Approach to Splitting Failure of Rock Discs (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 921-924 
    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 Brazilian splitting tests have been commonly and widely used as a standardized testmethod on disc or cylinder specimens to measure the indirect tensile strength of rocks in miningengineering and other rock engineering. In this paper, a novel numerical code, 3D Rock FailureProcess Analysis code, was applied to implement the splitting tensile failure tests on rock discs. Theinfluences of the heterogeneity on stress distribution in rock are also discussed and the splitting failurepatterns of specimens subjected to Brazilian tests are simulated. The simulated splitting results ofrock discs were found quite realistic, which indicate that the rock failure analysis method is applicableand practical for the study of rock disc splitting failure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.921.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Fracture Process Zone in Concrete Tension Specimen (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1045-1048 
    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 paper, some numerical tests on the fracture process zone (FPZ) in concrete tensionspecimen were carried out with Material Failure Process Analysis code (MFPA2D) to investigate thebehavior of the FPZ and the effect of the meso-scale heterogeneity of concrete on fracture process.The numerical results provide a clear indicator of the FPZ of concrete. The numerical results showthat the FPZ accompanied by AE events gradually develops ahead of the notch tip with the increase ofthe loading in the concrete tension specimen. Moreover, many of the AE events bring about verysmall energy at the beginning of loading stage. Zones of higher energy events demonstrate alocalization zone around the notch tip. The zones of AE events progresses forward gradually, andmuch densely distributed AE events can be observed in the FPZ. Moreover, the numerical simulationsabout AE events agreed well with those of the microcracks obtained by laboratory findings
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1045.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Numerical Simulation on Fracture Formation on Surfaces of Bi-Layered Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 993-996 
    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: Fracture formation on surfaces of bi-layered materials is studied numerically. A simplifiedtwo-layered materials model like growing tree trunk is present. This work is focused on patterns offractures and fracture saturation. We consider the formation of crack pattern in bark as an example ofpattern formation due to expansion of one material layer with respect to another. As a result of thisexpansion, the bark stretches until it reaches its limit of deformation and cracks. A novel numericalcode, 3D Realistic Failure Process Analysis code (abbreviated as RFPA3D) is used to obtainnumerical solutions. In this numerical code, the heterogeneity of materials is taken into account byassigning different properties to the individual elements according to statistical distribution function.Elastic-brittle constitutive relation with residual strength for elements and a Mohr-Coulomb criterionwith a tensile cut-off are adopted so that the elements may fail either in shear or in tension. Thediscontinuity feature of the initiated crack is automatically induced by using degraded stiffnessapproach when the tensile strain of the failed elements reaching a certain value. The different patternsare obtained by varying simulation parameters, the thickness of the material layer. Numericalsimulation clearly demonstrates that the stress state transition precludes further infilling of fracturesand the fracture spacing reaches constant state,i.e. the socalled fracture saturation. It also indicatesthat RFPA code is a viable tool for modeling fracture formation and studying fracture patterns
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.993.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Modeling of Stress-Induced Permeability Evolution and Damage of Rock (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 609-616 
    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: Rock permeability is important in civil and geo-hydraulic engineering, the mining andpetroleum industries, and in environmental and engineering geology. In this paper, considering themutual hydro-mechanical response between stress-induced permeability and damage, a coupledmathematical model for solid deformation and gas flow in the coal or rock was established and anattempt is made to investigate the rock permeability evolution, fracture patterns, and flow vectors inrock samples at the scale of usual laboratory samples as well as the relation between permeability andstress induced damage in connection with the complete strain-stress process of loaded rocks.Numerical simulations show that the permeability of rock was not constant, closely related to thestate of stress, but varied with the stress and strain states in the rocks. Microcracking, resulting fromthe concentration of stress on relatively weak rock elements, triggers successive crack initiation andpropagation that in turn leads to permeability enhancement. Prior to the peak strength, thepermeability decreases with increasing load. A dramatic increase in permeability occurs in thepost-peak stress-strain region due to the catastrophic collapse of microstructure in rock. Moreover,the permeability of rock in post-peak stress-strain region is much higher that that of in pre-peakregion. Such intensive studies of gas flow in stressed heterogeneous rocks are useful as initialapproaches to many engineering problems in mining and petroleum industries
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.609.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Non-Homogeneity on Limit Bearing Capacity of Rock Block (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 631-638 
    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: Rock is a typical non-homogeneous material. The behavior of a rock block undercompression and the process of micro-fracture in that block are phenomena of considerable interest inunderstanding the strength characterization of brittle rock. In this study, the effect of thenon-homogeneity on limit bearing capacity of rock block based on Rock Elasto-Plastic FailureProcess Analysis code (REPFPA) are simulated and investigated. Numerical simulations find out thatthere exists a functional relation between the heterogeneity coefficient and the limit bearing capacityof rock block. For specimens with the same heterogeneity, however, the numerical simulations showthat the failure modes depend greatly on the crack initiation location, which is found to be sensitive tothe local disorder features within the specimen. In addition, the characteristics of acoustic emissionswith the changing of heterogeneity coefficient were also found. These identifications are crucial forbetter understanding and interpreting the experimental results and consequently, improve ourconcepts in design or analysis of rock engineering structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.631.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Theoretical, Numerical and Experimental Study of Deformation and Failure Process of Rock (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 1529-1534 
    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 paper, theoretical constitutive model, numerical tool, viz., RFPA code and servo-type testing machine, viz., RMT-150B rock testing systems were briefly described, respectively. Then, based on theoretical analysis, numerical simulation and experimental tests for rock specimens in uniaxial compression, the relations and differences between theoretical, numerical and experimental results, especially the complete stress-strain curves, were contrastively analyzed and investigated. The reason for these relations and differences among results was also proposed in this paper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.1529.pdf
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