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  • 1
    Electronic Resource
    Electronic Resource
    Effect of temperature on interfacial shear strengths of SiC-glass interfaces (1991)
    Springer
    Journal of materials science 26 (1991), S. 1216-1222 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The in situ temperature dependencies of both the debonding, τd, and frictional, τf, shear stresses of a C-coated 140 μm SiC monofilament (Textron SCS-6 SiC fibre) were measured using the single fibre pullout-test. Two matrices, a borosilicate (7740 Corning Glass) and a soda-lime (Thomas Scientific) with different thermal expansion coefficients, were tested. At lower temperatures both τd and τf were found to decrease linearly with increasing temperature as a result of the relaxation of the residual stresses developed during processing, which were compressive in both cases. The stress free debonding shear stress for the borosilicate matrix was found to be 3.5 ± 1 M Pa and the friction coefficient between that matrix and the fibres was calculated to be 0.18. Fibre oxidation are believed to be responsible for enhanced bonding between the fibres and the borosilicate matrix at higher temperatures which results in an increase in both τd and τf. The large thermal expansion mismatch between the soda-lime matrix and the SiC fibres resulted in radial cracking of the former during processing. A technique is described where the whole temperature dependence of the interfacial shear stresses can be measured by a single specimen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544458
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  • 2
    Electronic Resource
    Electronic Resource
    Physical mapping of four RAPDs in the B chromosome of maize (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 534-538 
    Details
    ISSN: 1432-2242
    Keywords: Key words Zea mays ; B chromosome ; RAPD ; B-A translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Four DNA fragments were amplified specifically from the B chromosome by PCR using random 10-base oligonucleotides as primers. The location of the fragments in the B chromosome was determined based on whether or not they were amplified from the hypo- ploid DNA generated by four B-A translocations, three of which break in the proximal euchromatic region and the fourth in the distal one-third of the heterochromatic region on the B long arm. Since the hypoploid DNA carries the portion of the B chromosome distal to the breakpoint of a translocation, the presence of a fragment in the hypoploid DNA, but not in the control (which is devoid of any B chromatin), indicates that the fragments is located in the B region distal to the breakpoint in the B long arm. Two fragments were mapped to the euchromatic region and two others to either the distal portion of the euchromatic region or the proximal two-thirds of the heterochromatic region. These fragments in turn mapped three B-A translocations whose breakpoints were located in the euchromatic region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050448
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  • 3
    Electronic Resource
    Electronic Resource
    Free convection in the boundary layer flow of a micropolar fluid along a vertical wavy surface (1993)
    Springer
    Acta mechanica 101 (1993), S. 161-174 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A cubic spline collocation numerical method and a simple transposition theorem have been used to study the free convection in the flow of a micropolar fluid along irregular vertical surfaces. A sinusoidal surface is used to elucidate the amplitude wavelength ratio effects on the free convection in a micropolar boundary layer. The effects of micropolar parameterR and geometries on the velocity and temperature fields have been graphically studied. The skin friction stress on the wall has also been studied and discussed. It is observed that the frequency of the local heat transfer rate is twice that of the wavy surface, irrespective of whether the fluid is a Newtonian fluid or micropolar fluid; the same result is also obtained for the skin friction on the wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01175604
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  • 4
    Electronic Resource
    Electronic Resource
    A continuation–domain decomposition algorithm for bifurcation problems (1999)
    Springer
    Numerical algorithms 22 (1999), S. 367-383 
    Details
    ISSN: 1572-9265
    Keywords: bifurcation problems ; continuation methods ; domain decomposition methods ; finite differences ; 65N06 ; 65F10 ; 65F15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We study numerical solution branches of certain parameter-dependent problems defined on compact domains with various boundary conditions. The finite differences combined with the domain decomposition method are exploited to discretize the partial differential equations. We propose efficient numerical algorithms for solving the associated linear systems and for the detection of bifurcation points. Sample numerical results are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019119126672
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of concanavalin A on desensitization kinetics of GABA responses inAchatina fulica neurons (1995)
    Springer
    Cell biology and toxicology 11 (1995), S. 113-118 
    Details
    ISSN: 1573-6822
    Keywords: desensitization ; GABA ; lectin ; snail
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The effects of the lectin concanavalin A (Con A), on the kinetics of desensitization of the responses of voltage clampedAchatina fulica LP5 neuron to microperfused acetylcholine (ACh) and GABA were compared. Both ACh and GABA elicited increases in chloride conductance which decayed biphasically during prolonged applications of these agonists; an initial rapid decay was followed by a later slow decay. Con A (5 μg/ml) accelerated both the fast and the slow decays of responses to ACh. Con A (5 μg/ml) also accelerated the fast decay of responses to GABA, but the slow decay was unaffected, even by 20 μg/ml or more of the lectin. It is suggested that, at least in the case of GABA receptor, the fast and slow decays involve distinct desensitization kinetics. The effects of Con A on the desensitization of the ACh and GABA responses were reversed byd-mannose, a competitive and specific inhibitor of Con A binding to membrane sugar residues. These results provide further evidence that receptor desensitization can be influenced by perturbing the sugar moieties associated with the subunits comprising these signalling macromolecules. The carbohydrate residues may play an important role in regulating desensitization of transmitter receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767496
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of some mechanical properties of polycrystalline yttrium iron garnet (YIG) by non-destructive methods (1988)
    Springer
    Journal of materials science 7 (1988), S. 1217-1220 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722341
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  • 7
    Electronic Resource
    Electronic Resource
    A microstructural study on the surface and interface of CdTe/CdS solar cells (1997)
    Springer
    Journal of materials science 8 (1997), S. 125-132 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The surface and interface properties of CdTe/CdS solar cells, including interfacial mixing, surface and interface geometrical morphology, CdTe grain size and preferential crystal orientation of CdTe layers were studied using Auger electron spectroscopy (AES) depth profiling, atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, optical reflectance (OR) and X-ray diffraction (XRD) techniques. The correlation between the surface and interface properties and CdTe/CdS solar cell performance was also investigated. AES depth profiling was used to analyse the interdiffusion between the CdTe and CdS layers. Atomic force microscopy (AFM) suggests that the interfacial geometrical morphology has a significant influence on the photovoltaic property of CdTe/CdS solar cells. Rough interfaces tend to increase the photovoltaic conversion efficiency of solar cells because of multiple reflections. X-ray diffraction shows that polycrystalline CdTe/CdS solar cells with higher efficiencies appear to be orientated with more (1 1 1) planes of CdTe parallel to the macrosurface, but CdTe single crystals with differently indexed surface planes show almost the same reflection behaviour. Further theoretical and experimental analyses are therefore needed to clarify this observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018529726498
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  • 8
    Electronic Resource
    Electronic Resource
    Plasma-sprayed hydroxyapatite coating: effect of different calcium phosphate ceramics (1994)
    Springer
    Journal of materials science 5 (1994), S. 147-153 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Three kinds of calcium phosphate ceramic powders, namely commercial hydroxyapatite (CHA), self-made hydroxyapatite (SMHA) and synthesized hydroxyapatite (SHA), are employed as starting materials for plasma-sprayed coating onto a stainless steel (316L) substrate. Results show a mixture of hydroxyapatite (HA), tricalcium phosphate (TCP), and tetracalcium phosphate (TeCP) phases appearing in the CHA and SHA-derived coatings and a primary of a HA with trace contents of tricalcium phosphate phases resulting in the SMHA-derived coating. The HA appears to be the only observable crystalline phase present in the SMHA-derived coating after 7 days of incubation with a simulated body fluid (SBF); however, part of the impurities, i.e. TCP and TeCP, remain in the other coatings. No apparent microcracks can be found on the coated surfaces when SMHA and SHA are used. The poor packing density of SHA reflects its weakness in bonding strength to the substrate surface compared with that obtained using CHA and SMHA powders. The surface morphology of the coatings was found to alter significantly after a sufficient period of incubation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053335
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  • 9
    Electronic Resource
    Electronic Resource
    Multielement NAA for the characterization of Saudi Arabian rocks (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 109 (1987), S. 201-211 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The instrumental neutron activation analysis technique (INAA) was used in the qualitative and quantitative analysis of 48 geological samples from the Umm Al-Birak area in the Kingdom of Saudi Arabia. The samples were properly prepared together with their standards and simultaneously irradiated in a neutron flux of 2.4 ·1012 n·cm−2 s−1 in the reactor facilities of the National Tsing Hua University (THOR) in Taiwan. Gamma-spectra from the high resolution Ge(Li) detector were analyzed using the BRUTAl code. As a result of the analysis of the geological samples, 20 trace elements were identified qualitatively and quantitatively. These elements are: Co, Cr, Eu, Fe, Hf, K, La, Lu, Na, Rb, Sc, Sm, Ta, Tb, Th, U, Yb, Zn and Zr. The concentrations of these elements have been used in the investigations of the geochemistry of the Umm Al-Birak microgranite site using the BMDP computer code of the Ministry of Petroleum and Mineral Resources. This investigation showed that the high grade area is a differentiated rock that crystallized in a late stage of the Umm Al-Birak microgranite area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02117536
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of uranium and thorium concentrations in integrated circuit packaging materials (1989)
    Springer
    Journal of radioanalytical and nuclear chemistry 137 (1989), S. 341-350 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The purpose of the present research is to find a suitable technique to measure trace amount of uranium and thorium and to determine the surface α-flux in silicon compound /SiO/ used for fabrication of integrated circuit packaging materials. Among several commonly-used detecting techniques, it was found that neutron activation analysis /NAA/ was most promising. The results from NAA show a large difference in uranium and thorium concentrations when cadmium and boron carbide shields are used, whereas α-flux measurements show a low α-activity, which corresponds to the trace amount of uranium and thorium expected to be present in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02162462
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