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  • 1
    Electronic Resource
    Electronic Resource
    Minimum weight shape and size optimization of truss structures made of uncertain materials (1998)
    Springer
    Structural optimization 16 (1998), S. 147-154 
    Details
    ISSN: 0934-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Truss structures are optimized with respect to minimum weight with constraints on the value of some displacement and on the member stresses. The truss is considered made of an uncertain material, i.e. the value of the material constants are not known in a deterministic way, and each member may then exhibit a different value of stiffness, within a limited range of variation. The optimization must be done so that optimal solutions remain feasible for each value that the material constants may take for the considered uncertainty. In the present work a nonprobabilistic approach to uncertainty is used, and a variation of the material moduli with a, probabilistically speaking, uniform distribution over a convex and linearly bounded domain is considered. The two-step method is used to include the uncertainty within the optimization, where a diagonal quadratic approximation is used for the objective function and the constraints. Solutions for some of the most classical truss examples are found and compared with those obtained using nominal values of material constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01202825
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  • 2
    Electronic Resource
    Electronic Resource
    Recent Advances in Microwave and Millimeter-Wave Processing of Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3249-3254 
    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: We are using 2.45 GHz (S-Band) microwave systems and an 83-GHz, gytrotron-based,millimeter-wave beam system in material processing and other areas. We use one 2.45 GHz systemin preparation of nanophase metals, metal mixtures and metal oxides, via the patented continuousmicrowave polyol process, with potential for large scale, low cost production. Of interest areprecious metals, mixtures of magnetic and nonmagnetic metals, and mixed metal oxides for ceramicprecursors. The other S-Band systems are used to develop repair techniques for ceramic matrixcomposites where the repairs are heated to 200-1000°C. A portable, battery-powered system isbeing developed for field repairs, and promises to be much more practical than alternativeapproaches (e.g., heating blankets). The 83-GHz system is being used in rapid sintering ofpolycrystalline ceramic materials intended for use in high power solid state lasers, where therequirement if for sintering to transparency with high optical quality and good lasing efficiency.Transparent Yb-doped yttria has been produced with hybrid conventional/millimeter-wave sinteringof nanophase powders, as well as theoretically dense YAG. Another application for the millimeterwavebeam system is in consolidation and bonding of hard coatings to light alloys, such as SiC ontitanium, where the beam system allows heating of the coating to very high temperatures withoutoverheating the metallic substrate. Finally, the millimeter-wave system is being used in thedevelopment of millimeter-wave plasma-assisted diamond deposition, where the quasi-opticalsystem has significant advantages over conventional microwave plasma-assisted diamonddeposition. Results for these various areas will be presented and discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3249.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular Rydberg states: Classical chaos and its correspondence in quantum mechanics (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3479-3490 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Rydberg spectrum of Na2 has been shown previously to alternate when increasing energy between "stroboscopic fringes'' which correspond to a well known separable Hund's coupling case (a), and a complex, unidentifiable intermediate coupling. We use this system as a prototypic example to test some current ideas on the correspondence between classical chaos and properties of quantum spectra. We first determine the phase space structure and transition to chaos in classical mechanics. We then determine the change in line intensities and level spacing statistics in quantum mechanics. We show that this system has the expected behavior in the semiclassical limit in the presence of classical chaos, except for a peculiarity in level spacing statistics, but that this behavior is not a signature of chaos, since the same system shows similar behavior for some values of the parameters which correspond to a nonchaotic situation in classical mechanics. We discuss also some problems related to the nonvalidity of the semiclassical limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454918
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  • 4
    Electronic Resource
    Electronic Resource
    The low energy ^2H(α, αp)n reaction
    Amsterdam : Elsevier
    Nuclear Physics, Section A 386 (1982), S. 269-286 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(82)90113-0
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  • 5
    Electronic Resource
    Electronic Resource
    On the possibility to determine weak hyperfine structure interaction constants by magnetic depolarization
    Amsterdam : Elsevier
    Physics Letters A 40 (1972), S. 151-152 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(72)90836-5
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic depolarization of atomic fluorescence in flames
    Amsterdam : Elsevier
    Chemical Physics Letters 16 (1972), S. 154-156 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(72)80480-9
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  • 7
    Electronic Resource
    Electronic Resource
    Collisional angular momentum transfer in rydberg states of helium
    Amsterdam : Elsevier
    Chemical Physics Letters 51 (1977), S. 18-22 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(77)85346-3
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  • 8
    Electronic Resource
    Electronic Resource
    Singlet-triplet anticrossings and the electronic isotope shift in D"2
    Amsterdam : Elsevier
    Chemical Physics Letters 37 (1976), S. 507-511 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(76)85025-7
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  • 9
    Electronic Resource
    Electronic Resource
    NO2 jet cooled visible excitation spectrum: Vibronic chaos induced by the X˜ 2A1–A˜ 2B2 interaction (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 5701-5718 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Significant improvements have been obtained on measurements of the NO2 jet cooled excitation spectrum in the 16 300–18 502 cm−1 range, previously obtained by Smalley et al. [J. Chem. Phys. 63, 4977 (1975)], Persch et al. [Ber. Bunsenges. Phys. Chem. 92, 312 (1988)], and Hiraoka et al. [J. Mol. Spectrosc. 126, 427 (1987)]. The improvements concern first the rotational analysis, owing to a better resolution (150 MHz) and absolute precision (500 MHz), and second the completeness and purity of the resulting vibronic sequence, owing to a better sensitivity. As a result, 159 vibronic energy levels have been observed in the 16 500–18 500 cm−1 energy range, where 210±10 are expected. A detailed comparison with previous results is presented. The statistical analysis of the corresponding energy spacings shows that long range correlations up to 50 mean levels spacings are present, confirming the chaotic behavior of this set of vibronic levels. Furthermore, we analyze the observed rovibronic interactions (or rotational perturbations) that are responsible for the very irregular rotational behavior of the visible absorption spectrum of NO2 at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461620
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  • 10
    Electronic Resource
    Electronic Resource
    Hollow cathode ion lasers for deep ultraviolet Raman spectroscopy and fluorescence imaging (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 4452-4459 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article describes the development of hollow cathode ion lasers and their use in constructing an ultraviolet micro-Raman spectrograph with native fluorescence imaging capability. Excitation at 224.3 nm is provided by a helium–silver hollow cathode metal ion laser and at 248.6 nm by a neon–copper hollow cathode metal ion laser. Refractive microscope objectives focus chopped continuous wave laser light on a sample and collect 180° scattered photons. Imaging is accomplished by broadband visible illumination and by deep ultraviolet laser induced excitation of visible wavelength native fluorescence in untagged micro-organisms. This makes possible a detection strategy employing rapid imaging with laser excitation to locate regions of native fluorescence activity, followed by deep ultraviolet resonance Raman spectroscopy of the identified fluorescent sites. We have employed this probe for in situ detection of micro-organisms on mineral and soil substrates. We present here the deep ultraviolet resonance Raman spectra for the gram negative iron reducing bacterium Shewanella oneidensis obtained while the micro-organism remains in situ on the unpolished surface of the mineral calcite and in a Mars soil analog, JSC1. In the current configuration the in situ mineral surface limit of detection for fluorescence is one organism in 2×104 μm2 field of view and of order 20–30 micro-organisms for Raman spectra. For the Mars soil sample analog fluorescent target selection gives an effective ultraviolet resonance Raman spectral detection limit of 6×104cells/gm or ∼60 ppb. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1369627
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