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  • 1
    Electronic Resource
    Electronic Resource
    Assessment of earthquake hazard by simultaneous use of the statistical method and the method of fuzzy mathematics (1984)
    Springer
    Pure and applied geophysics 122 (1984), S. 982-997 
    Details
    ISSN: 1420-9136
    Keywords: earthquake hazard ; statistical indices ; total probability ; fuzzy sets ; fuzzy information ; descriptors ; membership function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A probabilistic method and a retrieval method of fuzzy information are simultaneously studied for assessment of earthquake hazard, or earthquake prediction. Statistical indices of regional seismicity in three adjacent time intervals are used to predict an earthquake in the next interval. The indices are earthquake frequency, the maximum magnitude, and a parameter related to the average magnitude (orb-value) and their time derivatives. Applying the probabilistic method, we can estimate a probability for a large earthquake with magnitude larger than a certain threshold occurring in the next time interval in a given region. By using the retrieval method of fuzzy information we can classify time intervals into several classes according to the regional seismic activity in each time interval and then evaluate whether or not the next time interval belongs to seismically hazardous time interval with a large earthquake. Some examples of applying both methods to the North section of the North-South Seismic Zone in China are shown. The results obtained are in good agreement with actual earthquake history. A comparison of the probabilistic method with the method of fuzzy mathematics is made, and it is recommended that earthquake hazard be assessed by simultaneous use of both methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876397
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  • 2
    Electronic Resource
    Electronic Resource
    L-selectin and E-selectin expressed on monocytes mediating Ehrlichia chaffeensis attachment onto host cells (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 227 (2003), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Ehrlichia chaffeensis, the agent of human monocytic ehrlichiosis, is an obligatory intracellular bacterium that exhibits monocytic host cell tropism. Ehrlichiae must enter the host cell, and then establish infection. The tropism of E. chaffeensis for monocytes suggests that the cell contains some specific surface components that mediate E. chaffeensis attachment and entry into host cells. In this study, host cell surface components that play a role in ehrlichial attachment were identified using a human monocyte/macrophage cell line, THP-1. E. chaffeensis attachment to THP-1 cells was partially blocked in the presence of antibodies to E-selectin and L-selectin, but not by antibodies to P-selectin, integrin αm, integrin αx, or normal mouse IgG as determined by real time polymerase chain reaction. Conversely, in HeLa cells that do not exhibit surface expression of E-selectin and L-selectin, antibodies to these cell surface proteins did not inhibit E. chaffeensis attachment. These findings indicate that E-selectin and L-selectin are cell surface proteins that might act as co-receptors and contribute to E. chaffeensis attachment and entry into THP-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(03)00696-7
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  • 3
    Electronic Resource
    Electronic Resource
    Sequence and characterization of an Ehrlichia chaffeensis gene encoding 314 amino acids highly homologous to the NAD A enzyme (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 154 (1997), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: DNA sequence analysis of the nadA gene of Ehrlichia chaffeensis revealed a 942 bp open reading frame with the capacity to encode 314 amino acids. The amino acid sequence of the E. chaffeensis quinolinate synthetase A (NAD A) has 53.6% identity and 82% similarity to the NAD A of the cyanelle of Cyanophora paradoxa. Portions of the homologous genes of E. canis and E. muris were also sequenced. The amino acid sequences of the NAD A of E. canis and E. muris have 89.2% and 93.2% homology, respectively, to the NAD A of E. chaffeensis. We propose that the nadA gene may be an excellent candidate for a genetic tool for the phylogenetic study of ehrlichiae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1997.tb12623.x
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  • 4
    Electronic Resource
    Electronic Resource
    Memory stem cells sustain disease (2005)
    [s.l.] : Nature Publishing Group
    Nature medicine 11 (2005), S. 1282-1283 
    Details
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] After antigen challenge, activated CD8+T cells clonally expand and acquire effector functions. After the initial response, most T cells are rapidly cleared through apoptosis, but a few survive and develop into memory cells. The identity of CD8+ T cells that have the potential to develop into ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nm1205-1282
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  • 5
    Electronic Resource
    Electronic Resource
    Safety Evaluation of Pressure Piping with Weld Flaw after Long Time Service in a Water Power Plant (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2601-2605 
    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: Pressure steel pipings in a water power plant have been in service for over fifty years. Inorder to assess the safety of the piping, whole check and tests for the piping were carried out. Thematerial for some piping is ST3 from former USSR, the other is A3 made in China. The mechanicalproperties were investigated by tests and were compared with the original material properties. Theresult shows the yield strength and tensile strength of serviced steels are less than those of originalmaterials. The surfaces of the piping were checked to investigate the corrosion, surface defects. Theflaws in the welds and near the welds of the pipings were detected by UT and MT, and several weldflaws were found. Based on the test and NDT investigation results, the strength, fracture and fatiguelife of the pipings are assessed according to Chinese standard GB/T19624-2004 and British standardBS7910-2000. The assessment results show that the strength of the piping is enough, and the pipingswith these flaws does not fracture. The piping can be safe in service under the normal operatingcondition for 104 to 106 cycles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2601.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Cement Loop Damage Mechanism in the Process of Repairing Casing (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 61-64 
    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: Based on the theories of fracture mechanics and composite materials mechanics, fibrouscomposite model that interacted on stratum, cement loop and casing was firstly established.Boundary conditions that the repaired force acted in fibrous composite model were also given. Theinfluences of interface damage evolution and fracture process of fiber and matrix on the cementloop mechanical properties were studied as well. Meanwhile the distributions of stress anddisplacement fields were obtained. Finally, the debonded length and variation of the optimumrepaired force were also determined, which can restrict the cement damage length to the lowestscale. The results given here can provide a reliable design references for improving the technologyof repairing casing damage well
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.61.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of matrix polarity and ambient aging on the morphology of sulfonated polyurethane ionomers (1989)
    Springer
    Polymer bulletin 22 (1989), S. 565-571 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Ethylene oxide units were incorporated into the backbone of Na+ sulfonated polyurethane ionomers in an attempt to induce aggregate dissociation at elevated, but observable, temperatures by reducing the incompatibility between ions and polymer. However, no dissociation could be observed by small-angle x-ray scattering (SAXS) before the onset of degradation, even when the polyol was pure EO. At 100°C and above, the SAXS patterns for all samples were quite similar, indicating morphological similarity. However, after annealing for several days at room temperature, two of the specimens appeared to develop a greater degree of microdomain order as evidenced by a narrowing of the main peak at q* and the development of a shoulder at 2q*x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00718935
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  • 8
    Electronic Resource
    Electronic Resource
    A study on ship vibration using finite element method (1983)
    Springer
    Applied mathematics and mechanics 4 (1983), S. 41-53 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract When the beam theory was used to calculate ship hull vibration, greater discrepancies were found between theoretical calculations and actual measurements especially at higher modes. Thus the beam model cannot be considered as a practical one for higher-mode calculations. This paper presents the application of two-dimensional finite element model for the calculation of ship vertical vibration. Using the multi-element structural dynamic analysis program DDJ(DL) developed by ourselves, the hull vibration analysis of two ships (vessel A and vessel B) was carried out on the Model-709 Computer made in the People's Republic of China. The results of the calculation, when compared with actual measurements, show that the two-dimensional model is much more efficient than the traditional beam model. The agreement between the calculations and measurements has been improved greatly, and this discrepancy at the 4th and 5th-modes has decreased to within 5% as compared to that of more than 20% in the traditional model. Furthermore, the model is relatively simple, the cost and time required for the computation is comparatively lower and shorter, and the calculation can be carried out on a medium-siezed computer. Therefore, this model is especially appropriate for analyzing the dynamic characteristics of ships at early design stages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01896712
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  • 9
    Electronic Resource
    Electronic Resource
    Castor oil based UV-curable polyurethane-acrylate interpenetrating networks (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 2249-2257 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Castor oil was reacted in varying ratios with β-isocyanatoethyl methacrylate to form a liquid urethane-methacrylate prepolymer. This prepolymer was then cured using ultraviolet radiation to form a series of base polymer networks or using various methacrylates to form conetworks. By swelling the base networks with the appropriate methacrylate monomers, semi- and full interpenetrating networks (IPNs) were prepared with similar compositions. All of the materials formed transparent films. Results of swelling experiments, dynamic mechanical analysis, differential scanning calorimetry, and small angle x-ray scattering are discussed.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070431214
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of model polyether-ester ionomers (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 799-806 
    Details
    ISSN: 0887-6266
    Keywords: ionomer ; polyether ; synthesis ; characterization ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In this study, a series of polyether-ester ionomers was prepared by neutralizing the carboxylic acid groups in 1 : 1 copolymers of benzenetracarboxylic dianhydride (BTDA) and poly(tetramethylene oxide) or poly(ethylene oxide) glycol. The base polymers were in a liquid state while the ionomers were in solid state and a separate ionic phase was formed. The local structure and the morphology of the ionomers were investigated by dynamic mechanical analysis, Fourier transform infrared spectroscopy, and small-angle x-ray scattering as well as extended x-ray absorption fine structure. Clearly, the geometric structure of the ionic sites varied with the nature of the metal ions and the morphology of the ionomers was determined by the microstructure of the ion aggregates. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 799-806, 1997
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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