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  • 1
    Electronic Resource
    Electronic Resource
    Epitaxial growth of high purity GaAs in an argon atmosphere
    Amsterdam : Elsevier
    Journal of Crystal Growth 70 (1984), S. 108-111 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(84)90253-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Simple Plastic-Damage Model for the Cement-Soil Admixture (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1145-1148 
    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: An Elastic Plastic-Damage (EPD) model is developed to model the softening behaviour ofthe cement-soil admixture based on continuous damage mechanics. The softening behaviour isconsidered to be characteristic outcome of the material degradation due to damage in material.Material degradation is modelled by reducing progressively the stiffness and yield stress of thematerial when the damage variable has attained a critical index. The basic equations of the model arederived and presented. A Fortran program for this model has been developed and implemented into afinite element code ABAQUS. In order to evaluate the applicability of this model, several unconfinedcompression tests are simulated using ABAQUS with this model. The computed results are comparedwith measured data and good agreement is achieved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1145.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of (1–x) CaTiO〈sub〉3〈/sub〉–xNdAlO〈sub〉3〈/sub〉 Ceramic Powder via Ethylenediaminetetraacetic Acid Precursor (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 147-149 
    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: (1–x)CaTiO3–xNdAlO3 (CTNA) microwave dielectric ceramics have a high Q value and a lowtemperature coefficient of resonant frequency ( τf ). CTNA ceramic powder was synthesized using apolymeric precursor derived from a mixed-metal ethylenediaminetetraacetic acid (EDTA) / ethyleneglycol solution. The precursors and derived oxide powders were characterized by thermogravimetricanalysis and X-ray diffraction. When x = 0.3, CTNA was synthesized at 900°C for 3 h in air. Comparedwith that prepared by the solid-state reaction method in literatures, the CTNA ( x = 0.3 ) ceramics withbetter microwave properties could be obtained at lower calcination and sintering temperatures by EDTAchelating method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.147.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Flow Stress and Microstructural Evolution of AM50 Alloy during Upsetting Forging Tests at High Temperature (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 815-818 
    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: Flow stress and microstructures evolution of AM50 alloy during upsetting forging tests were investigated in this paper. In upsetting forging deformation, cylindrical billets of AM50 alloy as-cast were compressed in the temperature range of 250°C to 350°C and strain rate range of 1.1×10-3s-1 to 2.8×10-2s-1. Under the deformed conditions, the true stress-true strain curves indicated that the true stress increased quickly at the initial time, then stayed at certain value for a short duration and increased continuously at lower temperature and high strain rate. It should be noted that the true stress kept the dynamic balance with the true strain at higher temperature and lower strain rate that the true stress obeyed the regulation as the same as the ordinary materials. The peak stress at all conditions increased with the strain rate increasing and the forging temperature decreasing. A great many recrystallized grains and dislocations were observed in the deformed specimens of AM50 alloy. The grain size of the deformed specimens decreased with decreasingforging temperature and increasing the deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.815.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructures, Tensile Properties and Forming Process of AZ31 Alloy Sheets (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 241-244 
    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: Rolling and punching techniques of AZ31 alloy were investigated in this paper. Variousrolling experiments were carried out to make fine-grained Mg sheets. Punching tests were conductedat the temperatures range from 70 to 300 oC. The analysis revealed that there existed an excellentwarm forming temperature for as-rolled AZ31 alloy. A warm deep punching tool setup using heatingelements was designed and manufactured to produce the cell phone. Microstructures were observedusing optical and scanning electron microscope equipped with EBSD. The textures in as-rolled andas-annealed specimens attribute to different mechanical properties along the various direction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.241.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A Damage Detection Method: CMSE Combined with Niche GA (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 929-932 
    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 paper presents an effective damage detection method of complex composite structures.It can be carried out through the experimental modal analysis of the damaged structure. The methodusing the improved Cross Modal Strain Energy (CMSE) technique and Niche GA has manyadvantages compared with other damage detection methods. The CMSE method can use any modesof the structure and the modes don’t need to be normalized or consistent in scale. The Niche GAimproves the efficiency of the calculation and enhances the capacity of identifying structural damagelocalization. The model is the composite material airfoil case. The numerical results show that themethod proposed in this paper is successful for damage detection of complex structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.929.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Optimal Placement of Sensors for Damage Characterization Using Genetic Algorithms (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 1033-1036 
    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: Sensor data are the basis for health assessment of complex structural systems. Carefulselection and logical layout of sensors is critical to enable the high reliability of system healthassessment. This paper presents a methodology how to use a minimum number of sensors, and whatlocations of them should be placed, so that the voltage signals received from the sensor can be used todetect both presence and extent of damage. In this study, an optimization procedure is developedusing Genetic Algorithm (GA) to determine the location of piezoelectric sensor for damage detectionin a composite wingbox. A new damage index using all differences in voltage signals decomposed bywavelet transform is proposed. Results show that the proposed method is available at determiningnumber and location of sensors for structural damage detection using piezoelectric patch sensors
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.1033.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Vibration-Based Damage Detection of Composite Wingbox Structures Using Improved Hilbert-Huang Transform (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 539-542 
    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: A vibration-based approach to detect crack damage in a cantilever composite wingbox isstudied using the improved Hilbert-Huang Transform (HHT). The improved HHT is composed ofHHT with Wavelet Packet Transform (WPT) and a simple but effective method for intrinsic modefunction (IMF) selection. For different damage status, in order to obtain structural dynamic responses,which imply plentiful damage information, the composite wing boxes were excited by a contrivedsquare wave signal. Then, the dynamic responses of intact wingbox and damaged wingbox aredisposed using improved HHT. Finally, a feature index vector of structural damage, i.e. the [removed info]ariationquantity of instantaneous energy, is constructed. The obtained results show that the proposed damagefeature index vector is more sensitive to small damage than those in traditional signal processing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.539.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Optimization of Wavelet Packets Analysis for Damage Detection in Composite Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 1149-1152 
    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: A method based on entropy-based criteria is present to choose the optimal decompositionof Wavelet Packets Analysis (WPA) for damage detection in composite materials. The structuraldamage indexes constructed based on energy spectrum variation of the structural vibration responsesdecomposed using WPA before and after the occurrence of structural damage usually generate acomplete binary tree to calculate its elements. Date mining is carried out in this paper by adoptionentropy as the criteria to choose the optimal decomposition tree. In the decomposition process, onlythe sub-signals which contain main information of the original signal are decomposed to generatenext level sub-signals. New damage index is constructed based on the optimal decomposition. Thenthe dimension of the damage index is reduced while still keeping its sensitive to damage. WhetherArtificial Neural Network (ANN) or genetic algorithm (GA) is used in the further process of tellingstructural damage status from damage index, this reduction will make remarkable time saving
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.1149.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Numerical Modelling of Soft Soil Installed by PVDs (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 1249-1254 
    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: One small-scale physical model test on the PVD (Prefabricated Vertical Drain) treatedHong Kong marine clay was simulated using finite element method (FEM) in this study. A UserMATerial (UMAT) subroutine describing an Elastic Visco-Plastic (EVP) constitutive model wasdeveloped and incorporated into one commercial finite element code ABAQUS. A degressivepermeability of the PVD strip was included to consider variations of its permeability during theconsolidation process. The UMAT and the adopted reducing technique were demonstrated to beeffective by good agreement between the observed consolidation settlement and excess pore waterpressures and the simulated ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.1249.pdf
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