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  • 2005-2009  (27)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Ordered Mesoporous Carbon Using MCM-41 Mesoporous Silica as Template (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 543-546 
    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: Mesoporous carbon with high surface area and ordered structure was synthesized via ananocasting process using mesoprous MCM-41 silica as a template and sucrose as a carbonprecursor. Sample was characterized by XRD, SEM, TEM and nitrogen adsorption. The resultsshow that the templated carbon has a BTE surface area ∼1200 m2/g, a pore volume ∼1.0 cm3/g, anda bimodal porosity centered at around 4 nm and 46 nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.543.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of Carrot Defects in 4H-SiC Epilayers (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 527-529 (Oct. 2006), p. 327-332 
    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: Structure of the “carrot” defects in 4H-SiC homoepitaxial layers deposited by CVD hasbeen investigated by plan-view and cross-sectional transmission x-ray topography, cross-sectionaltransmission electron microscopy, atomic force microscopy, and KOH etching. The carrot defectsnucleate at the substrate/epilayer interface at the emergence points of threading screw dislocationspropagating from the substrate. The typical defect consists of two stacking faults: one in the prismaticplane with second one in the basal plane. The faults are connected by a stair-rod dislocation withBurgers vector 1/n[10-10] with n〉3 at the cross-over. The basal plane fault is of Frank-type. Carrotdefects are electrically active as evidenced by contrast in EBIC images indicating enhanced carrierrecombination rate. Presence of carrot defects in the p-i-n diodes results in higher pre-breakdownreverse leakage current and approximately 50% lower breakdown voltage compared to the nominalvalue
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.527-529.327.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructure Evolution of AZ31 Magnesium Alloy during Warm Compression Forming (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1813-1817 
    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: Warm compression tests of AZ31 Mg alloy were carried out at five temperatures in30°C intervals from 210°C to 330°C. The samples of different thickness which were machinedfrom as-cast and pre-strained AZ31 billets were compressed into thickness 1mm and then cooled inthe air to room temperature. The microstructural evolution of AZ31 Mg alloy was investigatedduring warm compression forming. The results show that all the samples have undergone amicrostructure changes to different scales in the range investigated. The twinning is thepredominant deformation mechanism for magnesium alloys at moderate temperatures and itsoccurrence is dependent on temperature and strain. Microstructural evaluation indicates that themean size of the recrystallised grains decreases with increasing effective strain and temperaturebecause of sufficient dynamic recrystallization. The original grain has significant influence onmicrostructural evolution during warm forming
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1813.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Differences in Emission Spectra of Dislocations in 4H-SiC Epitaxial Layers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 345-348 
    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: Material defects such as Si-core and C-core partial dislocations (PDs) and threading screwdislocations (TSDs) and threading edge dislocations (TEDs) are being investigated for theircontributions to device performances in 4H-SiC. Non-destructive electroluminescence andphotoluminescence techniques can be powerful tools for examining these dislocations. In this report,these techniques were used to reveal the different spectral characteristics for the mentioneddislocations. At higher injection levels, both the Si-core and C-core PDs possessed a spectral peak at700 nm. However, at lower injection levels, the spectral peak for the Si-core PD remained at 700 nmwhile the peak for the C-core moved to longer wavelengths. For the threading dislocations, TSDspossessed a peak between 800 and 850 nm while the TEDs possessed a peak at 600 nm independent ofthe injection levels
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.345.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Evolution of Basal Plane Dislocations during 4H-SiC Epitaxial Growth (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 317-320 
    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: The evolution of basal plane dislocations (BPDs) in 4H-SiC epitaxy during its growth isinvestigated by using two types of interrupted growth in conjunction with ultravioletphotoluminescence (UVPL) imaging of the dislocations. For the first, each epitaxial growth wasstopped after 10-20 μm and a UVPL map was collected. For the second, changing the gas flowinterrupted the growth and the BPDs were imaged at the end. The first sequence made it possible totrack the formation of half-loop arrays and show that they arise from BPDs that glide perpendicular tothe offcut direction. For both types, each interruption causes between 30 – 50% of the BPDs to beconverted to threading edge dislocations (TEDs). This result suggests that using interrupted growthmay be an alternate method to producing epitaxial layers with low BPD concentration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.317.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    The Ultra Fine Grained (UFG) Zn Produced by Ball Milling (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 609-614 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Bulk ultra fine grained (UFG) Zn was produced by in situ consolidation of Zn elementalpowder with ball milling at room temperature and annealed for 1 hour at 200[removed info] after pure Znmilled. The 150 % elongation is obtained in UFG Zn during tensile test at 20[removed info] which is equal to0.43 Tm (Tm is the melting temperature of pure Zn). The elongation of UFG Zn is higher than the110 % elongation of nanocrystalline Zn ball milled at tensile elongation. The largest tensileelongation (150%) was observed at room temperature in UFG Zn
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.609.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Generation and characterization of a high molecular weight glutenin 1Bx14-deficient mutant in common wheat (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Plant breeding 124 (2005), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Significant progress has been made in understanding the structure of high molecular weight (HMW) glutenin subunits and their role in determining the end use quality of wheat grains. However, few reports have dealt with the development and characterization of knock out mutants for HMW glutenin subunit genes. Here, the molecular analysis of MB14, a mutant derived from an elite Chinese wheat variety Xiaoyan 54 through chemical mutagenesis is described. SDS-PAGE and Western blot experiments revealed that, in the seeds of homozygous MB14 plants, the expression of the 1Bx14 subunit was specifically blocked whereas the remaining four subunits (1Ax1, 1By15, 1Dx2, 1Dy12) accumulated to levels comparable to those in the wild type plants. The 5′-flanking region and the open reading frame (ORF) of the mutant 1Bx14 allele were amplified and compared to the corresponding regions of wild type 1Bx14. The nucleotide sequences of the 5′-flanking regions from the mutant and wild type 1Bx14 alleles were identical. However, the ORF of the mutant allele differed from that of the wild type 1Bx14 by three point substitutions, one of which resulted in a premature stop codon in the mutant ORF. Interestingly, the mutant 1Bx14 allele was still transcribed in the developing seeds, but no truncated translation product could be detected by Western blot analysis. Potential application of the 1Bx14 knock out mutant in studying the biological function of 1Bx14 and its contribution to the end use quality control in hexaploid wheat is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2005.01145.x
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  • 8
    Electronic Resource
    Electronic Resource
    High-efficiency transformation of Gossypium hirsutum embryogenic calli mediated by Agrobacterium tumefaciens and regeneration of insect-resistant plants (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 124 (2005), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A simple protocol of transformation of cotton (Gossypium hirsutum L.) at a high frequency has been developed via Agrobacterium mediation, coupled with the use of embryogenic calli as explants. Embryogenic calli derived from only one to two somatic embryogenic calli lines of two Chinese cotton cultivars, the cvs. Ekang 9 and Jihe 321 which have low embryogenic potency were first inoculated with the A. tumefaciens strain LBA4404 harbouring binary vector pBin438 carrying a synthetic Bacillus thuringiensis-active Cry1Ac and API-B chimeric gene. Infected embryogenic calli were co-cultivated for 48 h and were then moved on to the selection medium with kanamycin (100 mg/l) for 7-8 weeks. Then, the kanamycin-resistant calli (Km1) subcultured in proliferation medium would re-differentiate to form somatic embryos in 30 days. Cotyledon embryos were transferred to 100-ml Erlenmeyer flasks for germination and regeneration. Putative transformants were confirmed by polymerase chain reaction and Southern blot analysis. Forty-five regenerated plants were successfully transferred to soil, of which 12 proved to have the active Cry1Ac and API-B chimeric gene. Insect resistance was tested by bioassay. The transgenic plants were highly resistant to cotton bollworm (Heliothis armigera) larvae, with mortality (insect resistance) ranging from 95.8 to 100%. In comparison with the methods used in Agrobacterium-mediated transformation of cotton hypocotyls or cotyledons, about 6 months are saved by using the method presented in this paper to obtain a large number of transgenic plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2004.01056.x
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  • 9
    Electronic Resource
    Electronic Resource
    Linkage map construction and mapping QTL for cotton fibre quality using SRAP, SSR and RAPD (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 124 (2005), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Tetraploid cotton is one of the most extensively cultivated species. Two tetraploid species, Gossypium hirsutum L. and G. barbadense L., dominate the world's cotton production. To better understand the genetic basis of cotton fibre traits for the improvement of fibre quality, a genetic linkage map of tetraploid cotton was constructed using sequence-related amplified polymorphisms (SRAPs), simple sequence repeats (SSRs) and random amplified polymorphic DNAs (RAPDs). A total of 238 SRAP primer combinations, 368 SSR primer pairs and 600 RAPD primers were used to screen polymorphisms between G. hirsutum cv. Handan208 and G. barbadense cv. Pima90 which revealed 749 polymorphic loci in total (205 SSRs, 107 RAPDs and 437 SRAPs). Sixty-nine F2 progeny from the interspecific cross of ‘Handan208’בPima90’ were genotyped with the 749 polymorphic markers. A total of 566 loci were assembled into 41 linkage groups with at least three loci in each group. Twenty-eight linkage groups were assigned to corresponding chromosomes by SSR markers with known chromosome locations. The map covered 5141.8 cM with a mean interlocus space of 9.08 cM. A × test for significance of deviations from the expected ratio (1: 2: 1 or 3: 1) identified 135 loci (18.0%) with skewed segregation, most of which had an excess of maternal parental alleles. In total, 13 QTL associated with fibre traits were detected, among which two QTL were for fibre strength, four for fibre length and seven for micronaire value. These QTL were on nine linkage groups explaining 16.18-28.92% of the trait variation. Six QTL were located in the A subgenome, six QTL in the D subgenome and one QTL in an unassigned linkage group. There were three QTL for micronaire value clustered on LG1, which would be very useful for improving this trait by molecular marker-assisted selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2004.01039.x
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  • 10
    Electronic Resource
    Electronic Resource
    Functionally Graded Materials Under Severe Thermal Environments (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: Thermal shock strengths of a plate of a functionally graded material (FGM) are analyzed when the plate is suddenly exposed to an environmental medium of different temperature. A finite element/mode superposition method is proposed to solve the time-dependent temperature field. The admissible temperature jump that the material can sustain is studied using the stress-based and fracture mechanics-based criteria. The critical parameters governing the level of the transient thermal stress in the medium are identified. The strength of FGMs under transient thermal stresses is analyzed using both maximum local tensile stress and maximum stress intensity factor criteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00126.x
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