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  • 1
    Electronic Resource
    Electronic Resource
    Elasto-plastic analysis of Reissner-Mindlin plates by the use of hybrid stress FEM with layered model (1990)
    Springer
    Acta mechanica solida Sinica 3 (1990), S. 351-359 
    Details
    ISSN: 0894-9166
    Keywords: Reissner-Mindlin plate ; hybrid stress ; FEM ; layered model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Based on aπ mR -type variational formulation featuring a cross-depth layered model in conjunction with a mechanical sub-element for simulating the material constitution, the cross-depth plasticity development of the Reissner-Mindlin plate is investigated by following the loading process. A 4-node quadrilateral hybrid-stressc 0-continuous plate-bending element HPT-9β is formulated. Numerical examinations demonstrate its remarkable characteristic behavior in being free from spurious kinematic mode, capable of alleviating “locking” difficulties as the thin plate limit is approached and providing numerical results with remarkable accuracy and computational efficiency over Spilker's counterpart LH4. An elasto-plastic analysis of Reissner-Mindlin plates has justified the validity and effectiveness of the present scheme in depicting the cross-depth plasticity development following the loading process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02206404
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal stress relaxation behavior in thin films under transient laser-pulse heating (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3749-3752 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transient laser pulse has been used to generate nonsynchronous change of temperature rise and thermal expansion in thin films. The transient process of thermal expansion is recorded by a photoelectric high-speed acquisition system. By comparison of the calculated temperature rise and thermal expansion, thermal stress relaxation processes in Al films of 20–50 μm thickness is obtained. This result shows that, for transient heating, thermal stress exists even in the case of uniform temperature distribution and free expansion. And also there is a transient high stress in thin films under high-speed heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352907
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  • 3
    Electronic Resource
    Electronic Resource
    Physical and numerical model study of diffraction effects on seismic profiles over simple structures (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 108 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: 2-D scale models and synthetic seismograms have been used to study diffraction artifacts and interpretation pitfalls on seismic profiles over two classes of simple-shaped structures: a vertical fault model and a rectangular mound model.The fault throw was varied from one eighth of a wavelength (λ/8) to two wavelengths (2λ). For throws greater than λ/2, the structure is resolved in the x-t domain but diffractions which are present convey misleading structure. Amplitude and wavelet anomalies are observed for small fault displacement (λ/2) which serve to detect but not to define the exact fault position and extent. Migration improves but does not necessarily overcome the problem.Mound structures having heights of λ/8 to 2λ, and length of one half to twice the Fresnel zone radius, were investigated. Lateral resolution is improved as the length of the structure increases, but only for mounds which are vertically resolved (height greater than λ/2). For low relief mounds, resolution deteriorates with increasing mound length. The resulting edge diffractions, which interfere with the reflection events, serve to detect and identify the target. Amplitude anomalies are observed across the structures, but it is not possible (without calibration) to interpret the edges of the model. Even for thick mounds the diffraction patterns complicate the seismic picture and can lead to false interpretation.The migration aperture needs to be about 10 times the Fresnel zone radius to produce satisfactory results. However, for vertically unresolved structures, migration may not significantly help. Complicating factors with post-stack migration are lack of knowledge of the true velocity function and inadequacy of the CMP zero-offset equivalence assumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb03479.x
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  • 4
    Electronic Resource
    Electronic Resource
    NUMERICAL SEISMOGRAM COMPUTATIONS FOR INHOMOGENEOUS MEDIA USING A SHORT, VARIABLE LENGTH CONVOLUTIONAL DIFFERENTIATOR (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 41 (1993), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: A short convolutional differentiator (CD) for computing second spatial derivatives in the acoustic wave equation is presented. This differentiator is obtained by tapering the inverse Fourier transform of the band-limited Fourier spectrum of the second-derivative operator. This new filter has been applied to seismogram computations for inhomogeneous media and results are compared with the conventional high-order finite-difference (FD) and Fourier schemes. The operator can be progressively shortened at the model edges to reduce boundary artefacts. The CD method is superior to the conventional FD operator and comparable with the Fourier method in accuracy but faster to run. A strategy to reduce computation time by 20%, which exploits the localized nature of the operator, is given. The method is illustrated using simple 2D models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1993.tb00882.x
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  • 5
    Electronic Resource
    Electronic Resource
    Electrical characteristics of GaAs grown from the melt in a reduced-gravity environment (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 1521-1524 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical properties and structural defects of Te-doped GaAs grown in space have been investigated by using various techniques. The experimental results confirm that the microgravity conditions offer some advantages for the melt growth of III-V compound semiconductor materials; improvements of homogeneity and perfection as well as purity of the space GaAs single crystal are expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345662
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  • 6
    Electronic Resource
    Electronic Resource
    Simultaneous dysprosium- and lead-substituted high-Tc superconductor bismuth cuprates (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6347-6352 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The introduction of small amounts of Dy in ceramic BiSrCaCuO (BSCCO) with nominal composition of Bi2Sr2Ca1−xDyxCu2O8+z, Bi2Sr2Ca2−xDyxCu3O10+z, and Bi1.6Pb0.4Sr2Ca2−xDyxCu3O10+z with 0.1〈x〈0.3 was studied in both stoichiometric and nonstoichiometric compositions where the nonstoichiometric composition was used to aid the sintering process in order to obtain a maximum Tc and contained excesses of CaO and CuO. It was found that regardless of the sintering conditions and starting compositions only the Bi:Sr:Ca:Cu=2:2:1:2 (2212) phase was produced. The highest Tc (R=0) in the Dy-substituted sample obtained was 84 K and this was obtained only for the nonstoichiometric composition Bi1.6Pb0.4Sr2Ca2.5Dy0.3Cu3.5Ox which contained mostly the 2212 phase together with tiny amounts of Bi2Sr2Ca2Cu3Ox (2223) phase. High-resolution electron microscopy data performed on Bi1.6Pb0.4Sr2Ca2.5Dy0.3Cu3.5010+z show that the introduction of Dy in the original 2223 Pb-containing phase caused only the formation of the 2212 phase without changing the modulated structure known to occur in the substituted Bi and Sr BSCCO compounds confirming also earlier suggestions made by Tarrascon et al. [Phys. Rev. B 2, 4316 (1989)] that the rare-earth cations stabilize the 2212 phase and substitute only for Ca and not for the Sr or Bi sites in the 2212 phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346880
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  • 7
    Electronic Resource
    Electronic Resource
    Passive wavelength stabilization in the 1.5-μm region of wide gain spectrum lasers by Er3+-doped materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7310-7312 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Er3+-doped materials, either crystals or glasses, are shown to act as passive stabilizers for wide gain spectrum lasers of the F-center NaCl: OH− type and of the InGaAsP semiconductor type. The wavelength is demonstrated to be stabilized against perturbations originating from pumping intensity and temperature variations. A thermal stability coefficient of 0.14 A(ring)/°C is demonstrated. In the InGaAsP laser case, single-mode operation, independent of possible extra Fabry–Perot etalon modes, is achieved, with rejection of adjacent modes by 25 dB. The possibility of active stabilization in the case of an inhomogeneous gain spectrum laser is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347579
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic thermal expansion under transient laser-pulse heating (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3113-3114 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An infrared radiation pyrometer for transient temperature measurement and a photoelectric installation for micrometric length-change measurement were developed. After being heated by a CO2 laser pulse of 0.1 μs, the transient temperature-rise history and length change of thermal expansion of 20–50 μm Al films during tens of microseconds were recorded. Nonsynchronous change of temperature and thermal expansion under transient heating was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105755
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  • 9
    Electronic Resource
    Electronic Resource
    The edge density of 4-critical planar graphs (1991)
    Springer
    Combinatorica 11 (1991), S. 185-189 
    Details
    ISSN: 1439-6912
    Keywords: Primary 05 C 15 ; Secondary 05 C 35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Several constructions of 4-critical planar graphs are given. These provide answers to two questions of B. Grünbaum and give improved bounds for the maximum edge density of such graphs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01205071
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  • 10
    Electronic Resource
    Electronic Resource
    Failure of gubernacular development in the persistent müllerian duct syndrome allows herniation of the testes (1994)
    Springer
    Pediatric surgery international 9 (1994), S. 544-546 
    Details
    ISSN: 1437-9813
    Keywords: Persistent müllerian duct syndrome ; Müllerian inhibiting substance ; Gubernaculum ; Testicular descent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 4-month-old phenotypic male with persistent müllerian duct syndrome (PMDS) is described. Serum levels of müllerian inhibiting substance (MIS) were undetectable in an enzyme immunoassay, consistent with a in an MIS gene. Normal germ cells were present in the testis, suggesting that subsequent azoospermia found in other patients with this abnormality is caused by a postnatal defect in germ cell development after 4 months of age. The testes were not attached by normal male gubernacula, but were loosely anchored by a long “round ligament” to the inguinal region. Failure of masculinasation of the gubernaculum in this syndrome suggests that MIS is responsible for early gubernacular development, and hence may have a role in testicular descent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179676
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