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  • 2005-2009  (28)
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  • 1
    Digitale Medien
    Digitale Medien
    Integrating Software into PRA: A Test-Based Approach (2005)
    350 Main Street , Malden , MA 02148 , USA , and 9600 Garsington Road , Oxford OX4 2DQ , UK . : Blackwell Publishing, Inc.
    Risk analysis 25 (2005), S. 0 
    Details
    ISSN: 1539-6924
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik
    Notizen: Probabilistic risk assessment (PRA) is a methodology to assess the probability of failure or success of a system's operation. PRA has been proved to be a systematic, logical, and comprehensive technique for risk assessment. Software plays an increasing role in modern safety critical systems. A significant number of failures can be attributed to software failures. Unfortunately, current probabilistic risk assessment concentrates on representing the behavior of hardware systems, humans, and their contributions (to a limited extent) to risk but neglects the contributions of software due to a lack of understanding of software failure phenomena. It is thus imperative to consider and model the impact of software to reflect the risk in current and future systems. The objective of our research is to develop a methodology to account for the impact of software on system failure that can be used in the classical PRA analysis process. A test-based approach for integrating software into PRA is discussed in this article. This approach includes identification of software functions to be modeled in the PRA, modeling of the software contributions in the ESD, and fault tree. The approach also introduces the concepts of input tree and output tree and proposes a quantification strategy that uses a software safety testing technique. The method is applied to an example system, PACS.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1539-6924.2005.00638.x
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  • 2
    Digitale Medien
    Digitale Medien
    Deacetylase inhibition promotes the generation and function of regulatory T cells (2007)
    [s.l.] : Nature Publishing Group
    Nature medicine 13 (2007), S. 1299-1307 
    Details
    ISSN: 1546-170X
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Medizin
    Notizen: [Auszug] Histone/protein deacetylases (HDACs) regulate chromatin remodeling and gene expression as well as the functions of more than 50 transcription factors and nonhistone proteins. We found that administration of an HDAC inhibitor (HDACi) in vivo increased Foxp3 gene expression, as well as the production ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/nm1652
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  • 3
    Digitale Medien
    Digitale Medien
    Crack Growth Life Estimating for MSD Panel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 175-180 
    Details
    ISSN: 1662-8985
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The problem of multiple site damage (MSD) has got more attention in ageing structures.Cumulative effects of interacting cracks may significantly degrade the damage tolerance capacity ofstructures. Cracks caused by MSD are extremely difficult to detect and greatly reduce the residualstrength, fatigue life and overall structural integrity of aircraft panels. This paper presents a simplenumerical method, which use the principles of fracture mechanics and the computation results, topredict the fatigue crack growth life of MSD structure. Comparing with calculating crack growth lifecycle by cycle, this method will save much time. To verify the validity of the proposed method,experiment was conducted and reported with simulation specimen of representative MSD structurewith 5 details. The comparison between the calculated a-N curves and the crack growth lives and thetest results shows that the prediction result with this fast method is acceptable. A discussion wascarried out by numerical analysis; in with typical MSD structures with different initial crack lengthwere adopted. Crack interaction effect was found obviously, but it occurred mainly in the last part ofthe crack growth lives. The relative size of MSD cracks depends significantly on the distribution ofthe initial cracks
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.175.pdf
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  • 4
    Digitale Medien
    Digitale Medien
    Taylor Series Numerical Method in Structural Dynamics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 1213-1220 
    Details
    ISSN: 1662-8985
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Taylor series numerical method is a novel time integration method for structural dynamics.In comparison with the well-known ones, Taylor series method has high accuracy and goodconvergence characteristics and thus is a good alternative for solving structural dynamics problems.In the paper, the recursive formulae of Taylor series numerical method in linear and nonlinearstructural dynamics are derived. The desired user routine in Fortran 90, which was compiled andlinked into the general software ANSYS program, is designed and programmed. User-defined menusare constructed via the User Interface Design Parameter. Numerical examples illustrated the validityof the customized plug-in. The research in this paper promotes the algorithm application incomplicated engineering problems
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.1213.pdf
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  • 5
    Digitale Medien
    Digitale Medien
    Erosion Properties of Molybdenum Coatings Sprayed by Electro-Thermal Explosion Ultra-High Speed Spraying (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 1265-1270 
    Details
    ISSN: 1662-8985
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Molybdenum coatings are commonly used in the industry for protection against wear. Withan aim to investigate the erosion properties of this coating, molybdenum coating was sprayed ontoboth AISI 1045 and nickel-based superalloy (GH3039) substrate by electro-thermal explosionultra-high speed spraying process. Phase composition, microstructure and microhardness of thecoatings were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) andmicrohardness tester, respectively. Erosion tests of the coating at different particle impingement angeland material sample temperature were performed on a GW/CS-MS type tester. The high erosionresistance of the coating can mainly be attributed to high hardness, low porosity and metallurgicalbonding between the coating and the substrate
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.1265.pdf
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  • 6
    Digitale Medien
    Digitale Medien
    Stability Analysis of Local Thinned Shallow Spherical Roof of Oil Storage Tank (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 1463-1470 
    Details
    ISSN: 1662-8985
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The analytical evaluation and finite element methods are used to analyze the criticalstability of the shallow spherical roof of oil storage tank with an axial symmetrical corrosion region.At first, the nonlinear finite element method is adopted to calculate the global critical load of thestorage tank roof, and the local corrosion region is equivalent to a circular corrosion pit with uniformdepth. The results show that the tank wall and inner pressure of the stored oil have slight effects on thestability of the roof. To build the formula of local critical load of the tank roof, the circular corrosionpit is separated from the whole roof and treated as a shallow spherical shell which is elasticallysupported on the rest part of the roof. The equivalent support stiffness is obtained by the deformationcompatibility at the edge of the corrosion pit. The resulted nonlinear stability equation is solved witha modified iteration method to determine the local critical load. The local critical load for anin-service corroded oil tank roof is analyzed by the proposed approach and the results are comparedwith those calculated by the conventional nonlinear finite element method with good agreement andthe geometrical parameter of the corrosion region corresponding to the minimal critical load is 9.5
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.1463.pdf
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  • 7
    Digitale Medien
    Digitale Medien
    Microstructure and Grain Abrasion Properties of TiC-xNi Coatings Prepared by Electro-Thermal Explosion Ultra-High Speed Spraying (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 489-494 
    Details
    ISSN: 1662-8985
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: In this work, a new method, electro-thermal explosion ultra-high speed spraying (EEUSS),was utilized to synthesize the titanium carbide based and nickel bonded (TiC-xNi) coatings. Thenickel content was varied at the weight percents of 5, 10, 15 and 20%. The microstructure andproperties of the coatings were studied by means of scanning electron microscope (SEM), X-raydiffraction (XRD) and microhardness tester, respectively. The TiC-xNi coatings had the metallurgicalbonding with the substrate, and consisted of submicron grains. The grain abrasion tests resultsshowed that the abrasion resistance of the coatings was affected by the contents of Ni
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.489.pdf
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  • 8
    Digitale Medien
    Digitale Medien
    Surface Oxidation of Carbon Fiber and its Influence on the Properties of Carbon Fiber Reinforced BN-Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 901-904 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Toray T300 PAN-based carbon fibers were surface oxidized in air at 300, 400 and 500 °C. Thecomposition of surface was determined by X-ray photoelectron spectrometry (XPS), and themonofilaments of original carbon fiber and surface oxidized carbon fibers were tensile tested at roomtemperature. Three-dimensional carbon fiber reinforced BN-Si3N4 matrix composites were prepared byprecursor infiltration and pyrolysis using a hybrid precursor mixed by borazine and perhydropolysilazane.With the increase of the oxidation temperature, the content of size on the surface of fiber reduces, and thetensile strength of carbon fiber declines. Carbon fiber oxidized at 400 °C has a 93% residual strength andthe fiber oxidized at 500 °C is seriously decayed. The composite reinforced by original carbon fibersexhibits excellent mechanical properties, including high flexural strength (182.3 MPa) and goodtoughness; while the composite reinforced by 400 °C oxidized carbon fibers is weak (only 102.4 MPa)and brittle. The distinct difference of mechanical properties between the two composite is attributed to thechange of the interfaces between carbon fibers and nitride matrices
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.901.pdf
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  • 9
    Digitale Medien
    Digitale Medien
    Electrical Conductivity of Ceria Co-Doped with Zr and Re (Re=La,Y) (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 250-252 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The series of powders with the general formula of Ce0.8-xZrxLa0.2O1.9 (x=0, 0.05, 0.10, 0.15) andCe0.8-xZrxY0.2O1.9 (x=0, 0.05, 0.10, 0.15) were synthesized by the sol-gel method. The samples sintered at1500°C all possess the single phase with cubic fluorite structure. The lattice parameter and the ionicconductivity decrease with increasing the content of Zr. However, the ionic conductivity of ceriaco-doped with Zr and La reduces with decreasing the lattice strain
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.250.pdf
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  • 10
    Digitale Medien
    Digitale Medien
    Adaptive Compensation of Spatial Contour Error Based on Neural Networks in Three-Axis Machining (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 392-394 (Oct. 2008), p. 7-12 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The spatial contour error which exists in multi-axis machine tools is believed relativewith the track-lag error existing in the single axis, the set value of feed-rate and the curvature of thecontour. A spatial error model is taken for presenting a vector method to calculate the contour errorin three-axis machine tool and an adaptive cross coupled controller which is based on neuralnetwork is presented. The simulation results of cross coupled control in three-axis, indicate that thecontour precision can be improved effectively which exists in the machine tool, and the errorsinfluenced by the change of curvature and the set value of feed-rate can be obviously reduced
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.392-394.7.pdf
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