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  • 1
    Electronic Resource
    Electronic Resource
    Coupling-loss-arrested misaligned semiconductor laser arrays (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3756-3758 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coupling-loss-arrested misaligned semiconductor laser arrays are designed and fabricated by liquid-phase epitaxy. In these devices, the losses in the normal misaligned arrays is collected by a gain-induced positive waveguide, and then the collected light couples with light in the adjacent waveguides evanescently, therefore avoiding the coupling loss and strengthening the coupling. The constructed co-cavity element should have better characteristics with respect to transverse-mode selection. A clean single-lobe far field as narrow as 3° and a relatively low threshold of 130 mA for a seven-element array are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346294
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  • 2
    Electronic Resource
    Electronic Resource
    Von Hove model of quantum field theory-from the point of view of infinite dimensional stationary Markov process theory (1992)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 33 (1992), S. 1127-1131 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: There are two ways to quantize the classical von Hove model. One way is to quantize the classical von Hove field equation, and the other is to quantize the classical energy functional. In this paper, their relation to each other is pointed out. As an application the second-order approximate quantization of (φ4)2-kink field is studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529777
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  • 3
    Electronic Resource
    Electronic Resource
    Representation of the propagator and Schwinger functions of Dirac fields in terms of Brownian motions (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 5207-5216 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A mathematical path integral representation of the propagator and Schwinger functions of the Dirac fields on R4 interacting with a smooth non-Abelian gauge field is presented. The representation is essentially in terms of expectations with respect to the Brownian motion on R4. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531330
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of the Tetracyclic Mitomycin Skeleton via a Dialkylvinylsulfonium Salt (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 4977-4978 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00090a049
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  • 5
    Electronic Resource
    Electronic Resource
    Hot-band study of DABCO using resonant multiphoton optogalvanic spectroscopy (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 219-222 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100274a002
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  • 6
    Electronic Resource
    Electronic Resource
    Wide bandwidth, large, and tunable polarization mode dispersions in multilayered omnidirectional reflectors (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 187-189 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We numerically demonstrate the generation of large, broadband, and tunable polarization mode dispersion (PMD) with omnidirectionally reflecting dielectric stacks with embedded cavities. Both first-order and second-order polarization mode dispersion can be generated by similar configurations. Our examples show that the first-order PMD can be tuned from 0 to 30 ps over an 80 GHz bandwidth and second-order PMD from 0 to 50 ps/nm can be generated over a 100 GHz bandwidth. We also show that in our configuration there is no significant modal distortion of the light beams when the beam diameters exceed 3.5 mm. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1491284
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  • 7
    Electronic Resource
    Electronic Resource
    Regulation of Drosophila Ca2+/Calmodulin-Dependent Protein Kinase II by Autophosphorylation Analyzed by Site-Directed Mutagenesis (1998)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 71 (1998), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: In this study we demonstrate that Drosophila calcium/calmodulin-dependent protein kinase II (CaMKII) is capable of complex regulation by autophosphorylation of the three threonines within its regulatory domain. Specifically, we show that autophosphorylation of threonine-287 in Drosophila CaMKII is equivalent to phosphorylation of threonine-286 in rat α CaMKII both in its ability to confer calcium independence on the enzyme and in the mechanistic details of how it becomes phosphorylated. Autophosphorylation of this residue occurs only within the holoenzyme structure and requires calmodulin (CaM) to be bound to the substrate subunit. Phosphorylation of threonine-306 and threonine-307 in the CaM binding domain of the Drosophila kinase occurs only in the absence of CaM, and this phosphorylation is capable of inhibiting further CaM binding. Additionally, our findings suggest that phosphorylation of threonine-306 and threonine-307 does not mimic bound CaM to alleviate the requirement for CaM binding to the substrate subunit for intermolecular threonine-287 phosphorylation. These results demonstrate that the mechanism of regulatory autophosphorylation of this kinase predates the split between invertebrates and vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1998.71010378.x
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  • 8
    Electronic Resource
    Electronic Resource
    Surface Wave Caustics (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 114 (1993), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The geometrical theory of surface wave propagation on a laterally heterogeneous earth model diverges at caustics, where neighbouring rays cross. the caustics on a spherical earth are degenerate focal points at the source and its antipode; lateral heterogeneity removes this degeneracy and transforms the caustics into multiply cusped and folded curves. We investigate the geometric nature of these antipodal and source caustics using both linear ray-perturbation theory and exact ray tracing. the regions occupied by the R1-R2 and R2-R3 caustics extend as far as 20° from the antipode and 30° from source, respectively, even on a relatively smooth earth model such as M84A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb03920.x
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  • 9
    Electronic Resource
    Electronic Resource
    Validity of surface-wave ray theory on a laterally heterogeneous earth (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 123 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A necessary and sufficient condition for the validity of surface-wave ray theory is 〈inlineGraphic alt="inline image" href="urn:x-wiley:0956540X:GJI757:GJI_757_mu1" location="equation/GJI_757_mu1.gif"/〉≪ 1, where 〈inlineGraphic alt="inline image" href="urn:x-wiley:0956540X:GJI757:GJI_757_mu2" location="equation/GJI_757_mu2.gif"/〉 is the root-mean-square degree of the phase-velocity perturbation δc, and l is the degree of the equivalent mode nSl or nTl. This condition, which is independent of the number of orbits, is obtained by consideration of the Fresnel area along the surface-wave ray path between the source and receiver. We assess the accuracy of surface-wave ray theory by comparing the phase, arrival angle and amplitude anomalies obtained using the JWKB approximation with the corresponding quantities measured using ‘ground-truth’ synthetic coupled-mode seismograms on models of varying roughness. The JWKB results agree well with the coupled-mode results for model S12_WM13; on a contrived model with slightly rougher variations, however, the agreement deteriorates as the condition 〈inlineGraphic alt="inline image" href="urn:x-wiley:0956540X:GJI757:GJI_757_mu3" location="equation/GJI_757_mu3.gif"/〉≪ 1 is less well satisfied. The misfit of the ray approximation, which is dependent upon the quantity 〈inlineGraphic alt="inline image" href="urn:x-wiley:0956540X:GJI757:GJI_757_mu4" location="equation/GJI_757_mu4.gif"/〉, can be attributed to diffraction and other finite-frequency effects within the Fresnel area along the ray path; these effects are ignored by the JWKB theory but are fully accounted for by the coupled-mode summation. The wavefront smoothing produced by this Fresnel-area averaging limits the resolution of surface-wave inversion studies based upon the JWKB approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06888.x
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  • 10
    Electronic Resource
    Electronic Resource
    JWKB surface-wave seismograms on a laterally heterogeneous earth (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 119 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A numerically efficient implementation of JWKB theory is developed to calculate synthetic surface-wave seismograms on a smooth, laterally heterogeneous earth model. We illustrate the method by applying it to model SH12/WM13; the phase and amplitude anomalies of long-period, fundamental-mode Love and Rayleigh waves are compared with the corresponding results obtained using the great-circle approximation and first-order ray-perturbation theory, with the perturbations to the local eigenfunctions ignored. As expected, the most serious discrepancies between these two approximations and full JWKB theory occur for paths with large transverse phase-velocity gradients, which lead to significant deviations away from the source-receiver great circle. The great-circle approximation consistently under-estimates the phase of the first-arriving G1 Love and R1 Rayleigh waves, in accordance with Fermat's principle of least time. The global average Fermat bias is greater for Love than for Rayleigh waves; this may be partly responsible for the observed Love-Rayleigh discrepancy currently attributed to upper mantle transverse isotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb00130.x
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