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  • 1
    Electronic Resource
    Electronic Resource
    Reliability Calculation of Welded Pressure Pipe with Circumferential Crack Based on 3-D Elastic-Plastic SFEM (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 639-642 
    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: In this paper, the reliability of welded pressure pipe with circumferential surface crack wascalculated by using three dimensional stochastic finite element method. This method has overcomethe shortcomings of conservative results in safety assessment with deterministic fracture mechanicsmethod. The calculation of reliability was based on three dimensional elastic-plastic stochastic finiteelement program which was developed by ourselves. The effects of variables such as fracturetoughness, bending moment and the depth of the circumferential surface crack on the structurereliability were also discussed. The calculation results indicate that the crack depth has great effect onthe reliability of the welded pipe. When the mean value of the crack depth is changed from 3mm to7mm, the failure probability of the welded pipe will change from 10-8 to 10-2. The bending momentalso has great effect on the reliability of the welded pipe. When the mean value of moment is changedfrom10000 N.m to 15000 N.m, the failure probability of the welded pipe increases dramatically forthe same circumferential crack depth. Irrespective of the changing of moment, the pipe has higherreliability if the crack depth is less than 5mm(a/t〈0.5, t is the thickness of the pipe). The method hasput forward a new way for safety assessment of welded pipe with circumferential surface crack
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.639.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    The nature of a 2050–2150-cm−1 infrared band in neutron-transmutation-doped silicon grown by the floating-zone method in a hydrogen atmosphere (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5606-5608 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A strong, wide infrared absorption band in 2050–2150-cm−1 range has been found in neutron-transmutation-doped silicon grown by the floating-zone method in a hydrogen atmosphere and annealed at 650 °C. This band is due to the stretching vibration of the Si–H bond, formed as hydrogen atoms diffuse, aggregate, and saturate silicon dangling bonds in the neutron-irradiation disordered region. This absorption band is similar to that of hydrogenated amorphous silicon in the 1900–2150-cm−1 range except that its vibration frequency is somewhat higher. The disordered region defect and its amorphous-siliconlike property could be observed because of the incorporation of hydrogen. The hydrogen concentration of the floating-zone melted silicon grown in a hydrogen atmosphere used in this study is estimated to be (1–2)×1017 cm−3 on the basis of the strength of this wide infrared absorption band. A possible reason for this vibration frequency shift is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340342
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  • 3
    Electronic Resource
    Electronic Resource
    Creep and Creep-Recovery Behavior in Silicon-Carbide-Particle-Reinforced Alumina (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), 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: Flexure creep and creep-recovery behavior were investigated for monolithic Al2O3 and 10-vol%-SiC-particle-reinforced Al2O3-matrix composites in an air atmosphere at temperatures of 1160°-1400°C. Two types of SiC particles were used: one has an average size of 2.7 µm and has an amount of SiO2 impurities per unit surface area that is one order of magnitude higher than the other, which has an average size of 0.6 µm. Compared to the creep behavior of monolithic Al2O3, the strain rate of the composites with the 0.6 µm SiC particles (denoted here as S-10) did not decrease; the composites with the 2.7 µm SiC particles (denoted here as L-10) exhibited excellent creep resistance. This difference was related to the microstructural features and the oxidation behavior of the composites: the Al2O3 grains in S-10 were mainly equiaxed, only ∼10% of the Al2O3 grains were elongated, and most of the SiC particles that resided at the grain boundaries or at triple-grain junctions were oxidized during creep, whereas the Al2O3 grains in L-10 were mostly irregularly shaped and elongated and most of the SiC particles were entrapped in the Al2O3 matrix grains, which prevented the oxidation of the SiC particles. These different microstructural features were associated with different amounts of SiO2 impurity content per unit surface area on the SiC particle surfaces. In addition, the monolithic Al2O3 showed no anelastic recovery when the load was removed; however, the composites exhibited significant anelastic recovery, especially for L-10. This phenomenon was attributed to the elongated grain morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01858.x
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of External Loads on the Reliability of Welded Pipe with Circumferential Crack (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2513-2516 
    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 reliability of welded pressure pipe with circumferential surface crack was calculated byusing 3-D stochastic finite element method. This method has overcome the shortcomings of conservativeresults in safety assessment with deterministic fracture mechanics method. The calculation of reliabilitywas based on 3-D elastic-plastic stochastic finite element program which was developed by ourselves.The effects of variables such as bending moment, the inner pressure on the structure reliability werediscussed. The calculation results indicate that the bending moment has great effect on the reliability ofthe welded pipe, and the inner pressure has little effect on the reliability of the welded pipe if the innerpressure is less than 10MPa. If the mean value of the inner pressure changed from 0.5MPa to 30MPa, thefailure probability will changes from 10-6 to 10-2. The bending moment also has great effect on thereliability. When the mean value of moment is changed from10000 Nm to 15000 Nm, the failureprobability of the welded pipe increases dramatically for the same inner pressure. Irrespective of thechanging of moment, the pipe has higher reliability if the inner pressure is less than 6 MPa. The methodhas put forward a new way for safety assessment of welded pipe with circumferential surface crack
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2513.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructure and mechanical properties of SiC particle reinforced Al2O3 matrix composites (1996)
    Springer
    Journal of materials science 15 (1996), S. 1927-1931 
    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/BF00274339
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  • 6
    Electronic Resource
    Electronic Resource
    Electrostatic effect on the flow behavior of a dilute gas/cohesive particle flow system (1996)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 42 (1996), S. 1590-1599 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cohesive (Group C) particles have been widely used in various industries. To handle and process such fine particles, a clear understanding of the flow behavior and interparticle force, is needed. To achieve that objective, a Laser Doppler Anemometer system was used to measure particle velocity, fluctuating velocity, and size and extent of agglomeration or cluster formation of particles in a dilute gas/fine oil shale particle flow system with particle density of 2,082 kg/m3, average particle volumetric concentration of 1.5%, and average particle mass flux of about 100 kg/m2·s in a controlled-moisture environment. The flow behavior of the particles was also studied for a mixture of 99% shale particles and 1% antistatic agent (Larostat powder, a quaternary ammonium compound) to examine the role of electrostatic force in gas/cohesive particle flow behavior. The addition of Larostat powder significantly reduced the electrostatic force and, in turn, made Group C particles behave similar to Group A or in some cases to Group B particles. In addition, our experimental data showed that the Maxwellian distribution function is a reasonable assumption to describe the velocity probability density function of the shale particles with or without antistatic agents.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690420610
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  • 7
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    Eutrophic water purification efficiency using a combination of hydrodynamic cavitation and ozonation on a pilot scale (2014)
    Springer
    Details
    Publication Date: 2014-11-29
    Print ISSN: 0944-1344
    Electronic ISSN: 1614-7499
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 8
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    A Novel Solid-State Thermal Rectifier Based On Reduced Graphene Oxide (2012)
    Springer Nature
    Details
    Publication Date: 2012-07-24
    Description: Recently, manipulating heat transport by phononic devices has received significant attention, in which phonon – a heat pulse through lattice, is used to carry energy. In addition to heat control, the thermal devices might also have broad applications in the renewable energy engineering, such as thermoelectric energy harvesting. Elementary phononic devices such as diode, transistor and logic devices have been theoretically proposed. In this work, we experimentally create a macroscopic scale thermal rectifier based on reduced graphene oxide. Obvious thermal rectification ratio up to 1.21 under 12 K temperature bias has been observed. Moreover, this ratio can be enhanced further by increasing the asymmetric ratio. Collectively, our results raise the exciting prospect that the realization of macroscopic phononic device with large-area graphene based materials is technologically feasible, which may open up important applications in thermal circuits and thermal management. Scientific Reports 2 doi: 10.1038/srep00523
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 9
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    Energies, Vol. 7, Pages 4261-4280: Research on Energy Saving Potential for Dedicated Ventilation Systems Based on Heat Recovery Technology (2014)
    MDPI Publishing
    In: Energies
    Details
    Publication Date: 2014-07-03
    Description: Research results have identified the use of heat pipe heat exchangers (HPHXs) for heat recovery as a way to reduce the pre-cooling and re-heating energy. This paper suggests decoupling dehumidification from cooling to reduce energy consumption. The feasible usage and the energy saving potential of heat pipe heat exchanger at the air handler dedicated in accomplishing this objective is investigated. In this paper a dedicated ventilation system combined with a HPHX to reduce energy consumption is tested and investigated under varying conditions by laboratory experiments. The energy saving potential and heat pipe (HP) effectiveness are tested and calculated under various outdoor conditions. The simulation and experimental results demonstrate that for all cases examined, the average HP effectiveness and energy savings have the same trend at various outdoor temperatures and Relative Humidity (RH) values. It has been found that the heat pipe can be applied to save over 60% energy for the air-conditioning operating hours. The reduction in overall energy is from 1.8% to 2.8% for the whole system. Therefore, the results confirm that the proposed set-up is useful for buildings to achieve intended energy saving objectives in subtropical climates where air-conditioning demand is highly variable.
    Electronic ISSN: 1996-1073
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 10
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    Surface double-layer structure in (110) oriented BiFeO3 thin film (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-11-18
    Description: Surface double-layer structure different from the interior was found in BiFeO 3 thin film grown on SrRuO 3 covered SrTiO 3 (110) substrate by pulsed laser deposition. It was shown that BiFeO 3 film exhibits epitaxial phase with single domain. X-ray reflectivity and X-ray photoelectron spectroscopy results revealed a skin layer of less than 1 nm with a reduced electron density and different surface state. Grazing incidence x-ray diffraction convinced a surface multi-domain structure of several nm beneath the surface skin layer. The double-layer near surface structure would be originated from the large depolarization field produced by the single-domain structure with strain.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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