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  • 1
    Electronic Resource
    Electronic Resource
    Research and Development of Mg-Al-Sr Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 115-117 
    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: The addition of strontium to Mg-Al based alloys offers good creep resistance to meet thematerial requirements for automotive applications. The composition, microstructure and mechanicalproperties of Mg-Al-Sr alloys are discussed in this paper. The effects of alloy elements such as Ca, Tiand Mn in Mg-Al-Sr alloy are summarized. Technologies for preparation of Mg-Sr master alloy weredeveloped, including mixture method and vacuum thermal reduction method which may also be usedfor preparation of Mg-Al-Sr alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.115.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Study on the Stress Intensity Factor for Mixed Mode Surface Crack under Three Point Bending (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 85-90 
    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: In the virtual crack closure method (VCCM), the energy release rate is computed based onthe results of finite element calculation, and the stress intensity factor (SIF) is computed from theenergy release rate. In this paper, the stress intensity factor of mixed-mode surface cracks under threepoint bending is studied by using the three dimensional modified virtual crack closure method(MVCCM). The modified virtual crack closure method is required to open one element face areawhose shape is arbitrary and finite element widths are unequal across the crack front. The effect of thedistance between the location of load and crack face, crack shape and crack depth to the stressintensity factor is also discussed, along with practical results and conclusions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.85.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of Mg-Sr Alloy Using Electrochemical Reduction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 119-123 
    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: Suspended on Mg-base melt, SrCl2 was electrochemical reduced to prepare Mg-Sr alloy.The kinds of Sr-compounds, composition ratio of flux, temperature of molten salt and Mg-basemolten bath and recovery of Sr were discussed. According to theories and experiments, this paperpresents the relations between the adding flux and reduction of Sr-compounds with the technicalparameters. The electrode reactions and the Gibbs Free Energies were evaluated based onthermodynamics analysis. The results show that composition of flux played important roles in thereduction process. The optimized technical flow and parameters for the application of the new methodwere advised
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.119.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Mg-Sr Alloys Using Vacuum Reduction: A Thermodynamics Approach (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 463-466 
    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: At the present Mg-Sr alloy is usually produced by alloy mixing process ormelt-leaching-reduction process which has low productivity. A new process has been developedtermed “Preparation Mg-Sr alloys using vacuum thermal reduction”. The principle and procedure ofthe new process were discussed in this paper. The reduction thermodynamics was analyzed, includingestablishing the oxygen potential diagram of Sr, Mg, Si and Al, determination of main reactions, andevaluation of Gibbs free energy in vacuum. The results showed that Mg-Sr alloys can be obtained bysynchronous reduction of SrO and MgO from a mixture of MgO, SrO, Si, CaO. The equipment,reduction temperature and vacuum for the new process have been also discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.463.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Study on Al Alloy Surfaces Treated by Ion Beams (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 211-214 
    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: Plasma-enhanced ion beams are used for the surface modification of 2024 Al and 7075 Alalloy samples. The morphology of the treated surface of the samples is examined. The corrosionresistance and bending fatigue properties were measured on the treated and untreated samples. Theeffects of ion beam parameters are discussed. It is indicated that during the ion bombardment, cratersare formed and surface melting is produced on the treated surfaces. The effects of ion beambombardment are limited to the surface layer of samples. With the ion beam energies used in thisstudy, improved corrosion resistance was obtained from the treated surfaces of the samples
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.211.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of Sr Content in Mg-Sr Alloys Using Faas (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 215-218 
    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 Air-acetylene Flame Atomic Absorption Spectrometry (FAAS) was used to measureSr content in Mg-Sr Alloys. The experiment conditions including acetylene flow rate, measurementheight, flame wavelength were studied and the disturbing factors were discussed. It was found that, asdissolution agent of alloys and LaCl3 as the deionization agent and flame wavelength being 460.7nm,the detection limits is 1.16mg/L and the relative standard deviations is less than 0.3% and the recoveryrates of Sr is more than 95%. The advantages of this method were summarized as: high sensitivity andprecision, low chemistry disruption, good selectivity, good recurrence characteristics of themeasuring conditions. The method is suitable for the control analysis and sample-system analysis ofdetermination Sr content in the Mg-Sr Master Alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.215.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Transient vibrational spectroscopy by flash photolysis stimulated emission pumping: 3ν2 of singlet methylene (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 7033-7035 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A vibration–rotation spectroscopic method based on stimulated emission pumping has been developed for transient molecules generated by flash photolysis. This method may be generally applicable to radicals with electronic excited states accessible by visible or UV laser pulses. This first demonstration on the bending v2 =3 level of a˜ 1A1 CH2 generated a vibrational term value of 3950.45(7) cm−1 and the rotational constants A=25.665(40), B=11.470(7), and C=6.7140(61) cm−1. These constants indicate that the 3ν2 level is well below the bending-potential barrier. Perturbations of several rotational levels by the triplet state are identified. In addition, and most interestingly, abnormally intense ΔKa =3 transitions were observed in the a˜←b˜ 2163 band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455331
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  • 8
    Electronic Resource
    Electronic Resource
    Bending overtones and barrier height of a˜ 1A1 CH2 by flash photolysis stimulated emission pumping (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4615-4623 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The J≤7 and Ka≤3 rotational levels of the bending vibrational overtones, (0,2,0), (0,3,0), and (0,4,0), and the (1,1,0) combination band of a˜ 1A1CH2 were characterized in detail by stimulated emission spectroscopy. The methylene was generated from ketene photolysis. Spectroscopic analyses using a rigid rotor Hamiltonian gave the vibrational term values and rotational constants. The latter were found to be strongly J and Ka dependent suggesting the inadequacy of the rigid rotor Hamiltonian for calculating the rotational energy to high accuracy. Effects of Coriolis, Fermi, and singlet–triplet perturbations were all observed in the spectra and discussed. Abnormally intense ΔKa=3 transitions were observed in the a˜←b˜, 2162 and 2163 bands. From fitting the experimentally measured bending vibrational term values by a model calculation based on the WKB theory, the barrier height to linearity in the a˜ state was determined to be 9870 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458701
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  • 9
    Electronic Resource
    Electronic Resource
    One possible way to promote the bond-selective chemical reactions by frequency-modulated lasers (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 3819-3824 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: It is proposed in this paper that we can use frequency-modulated (FM) lasers to realize bond-selective chemical reactions or to raise the efficiency of molecular isotope separation. Examples are given for HF molecule and the C–H bond in some hydrocarbons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450093
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  • 10
    Electronic Resource
    Electronic Resource
    Erratum: Statistical theory of multiphoton excitation of polyatomic molecules based on the Wigner function [J. Chem. Phys. 84, 114 (1986)] (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 5974-5974 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450855
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