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  • 1
    Electronic Resource
    Electronic Resource
    Generation and chemical properties of dicyclopropylcarbene. Ring expansion, chlorine abstraction, carbon-hydrogen bond insertion, and alkene addition reactions (1983)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 105 (1983), S. 5675-5679 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00355a026
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  • 2
    Electronic Resource
    Electronic Resource
    Anticancer Specificity of Some Ellipticinium Salts against Human Brain Tumors in vitro (1994)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 37 (1994), S. 2185-2189 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00040a010
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  • 3
    Electronic Resource
    Electronic Resource
    Variations in auto-oscillation frequency at the main resonance in rectangular yttrium–iron–garnet films : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5374-5376 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High power microwave experiments conducted on a rectangular yttrium-iron-garnet (YIG) film indicate a parabolic dependence of the square of the frequency of auto-oscillations on microwave signal amplitudes, an observation that is qualitatively consistent with prior theoretical predictions. Forward volume magnetostatic waves were excited using a microstrip transducer kept in contact with a YIG film placed in a constant external magnetic field (Hdc=3.48 kG). Variations in the input microwave power (10 dBm〈P〈25 dBm) and frequency (5.1 GHz〈f〈5.7 GHz) were used to locate and study auto-oscillations close to the Suhl instability at the main resonance. A novel method of viewing changes in the microwave passband using density plots enables us to study variations in the dipole gaps in the passband near the Suhl instability. A broadening of dipole gaps into fingerlike regions of weak transmission marks the onset of auto-oscillations beyond the instability threshold. These regions are associated with a variety of spin-wave dynamics ranging from simple auto-oscillations to auto-oscillations with period doubling and in some cases an abrupt transition to a turbulent wide-band power spectrum. The parabolic dependence of the auto-oscillation frequency persists despite a period-doubling bifurcation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362307
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  • 4
    Electronic Resource
    Electronic Resource
    Hydroxyalkylation with .alpha.-hydroperoxydiazenes. Alcohols from olefins and carbonyl compounds from enol ethers (1984)
    s.l. : American Chemical Society
    The @journal of organic chemistry 49 (1984), S. 336-342 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00176a023
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  • 5
    Electronic Resource
    Electronic Resource
    Quadratic power dependence of the magneto-optic coupling coefficient in the magnetostatic wave–optical interaction (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5079-5079 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transverse magnetostatic wave (MSW)–optical interaction was first observed at relatively low microwave power levels.1 Recent investigations show that a change in the demagnetizing field due to an increase in the dynamic magnetization causes a shift in the microwave passband2 and consequently a shift in the MSW–optical interaction spectrum.3 We now focus our efforts on determining the effects of high microwave power on the magneto-optic coupling coefficient (κ). A microstrip T transducer excited forward volume MSWs in a bismuth–lutetium–iron–garnet film. An optical beam is edge coupled into the film and the transverse MSW–optical interaction is observed at high microwave power levels. Using the coupled mode equations, we show that the amplitude of the diffracted beam is a product of κ and the phase mismatch between the optical guided modes and the MSWs. Taylor series expansions for κ and the MSW wave number (β) are used to obtain an analytic expression for the MSW–optical interaction. The dependence on β causes a shift in the interaction passband with increasing microwave power. After correcting for this nonlinear shift, the residual dependence of the output optical intensity on input microwave power is attributed to a quadratic power dependence in κ. The coefficient of the quadratic term was observed to be ∼1% of the coefficient of the linear term and its effect at high power is comparable to that of the nonlinear frequency shift.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364512
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  • 6
    Electronic Resource
    Electronic Resource
    Quadratic power corrections to the dynamic magnetization using the transverse magnetostatic wave-optical interaction (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 2730-2735 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A microstrip T-transducer excites forward volume magnetostatic waves (MSWs) in a [BiLu]3Fe5O12 film. An optical beam is edge coupled into the film and the transverse MSW–optical interaction is observed at high microwave power levels. Using the coupled mode equations, we demonstrate that a T-transducer causes the intensity of the diffracted beam to be a product of terms involving the magneto-optic coupling coefficient (κ) and the phase mismatch between the optical guided modes and the MSWs. Taylor series expansions for κ and the MSW wave number (β) are used to obtain an analytic expression for the MSW–optical interaction. The dependence on β causes a shift in the interaction spectrum with increasing power. After correcting for this shift, the residual dependence on power is attributed to a quadratic correction to the dynamic magnetization which in turn affects κ. We demonstrate how the quadratic dependence plays an important role in accurately determining an expansion for the MSW dispersion relation. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363970
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  • 7
    Electronic Resource
    Electronic Resource
    Selective reduction of aldehydes in the presence of ketones (1979)
    s.l. : American Chemical Society
    The @journal of organic chemistry 44 (1979), S. 3969-3970 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01336a049
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  • 8
    Electronic Resource
    Electronic Resource
    Information dimension analysis of chaotic forward volume spin waves in a yttrium–iron–garnet thin film (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5091-5093 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Forward volume spin waves were excited in a yttrium–iron–garnet film using a microstrip delay line. Low frequency modulations in output power were captured on a digital oscilloscope for various combinations of microwave input frequency and power. Using the decrease in mutual information as a criterion, an embedding delay time was chosen for each time series. The method of false nearest neighbors was then used to calculate a minimal embedding dimension, D. Despite large changes in input frequency (4.4 GHz〈f〈4.6 GHz) and power (15.7 dBm〈P〈22.7 dBm), D≤3 for each time series, indicating a low dimensional system. Finally, the information dimension, d, was estimated by computing the distance from a collection of reference points to their nearest neighbors. The distribution for d was found to be bimodal. When correlated with the input microwave power and frequency, it was found that values of d〈2 occurred close to the auto-oscillation threshold in the vicinity of an even dipole gap. d〈3 was observed at higher power levels or at frequencies close to an odd dipole gap. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373258
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  • 9
    Electronic Resource
    Electronic Resource
    Flux reversal time in thin film write heads: A nonlinear system theoretic approach (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6907-6911 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large amplitude write currents elicit a nonlinear frequency response from thin film write heads. Saturation of the yoke structure causes the measured inductance to be a simultaneous function of both frequency and amplitude. Density plots are used to study the change in inductance over a two dimensional input parameter space comprising ac write current frequency (1〈f〈150 MHz) and dc write current amplitude (0〈I〈60 mA). A simple lumped element reluctance model representing such coupled behavior is proposed. The model extends quasistatic measurements that indicate a quadratic relation between the input magneto-motive force and the magnetic flux in the yoke structure. The circuit consists of a nonlinear reluctance element, described by a Volterra series, connected in series to a linear inductive element. The superposition theorem allows an analytic estimation of the flux reversal time for increasing write current amplitudes. A typical thin film write head that exhibits a quadratic dependence of flux on write current amplitude is analyzed. The model predicts a 30% decrease in flux reversal time over that predicted by a linear model as the amplitude of a stepped input write current is increased by a factor of 10. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370211
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  • 10
    Electronic Resource
    Electronic Resource
    Nonlinear microwave-magnetic resonator operated as a bistable device (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4859-4861 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The excitation of large amplitude spin waves causes a shift in the resonance frequency of a ferrite resonator towards higher frequency values. Using this shift, a resonator can be designed to operate in a bistable mode where the history of the input power determines the output power. A theoretical calculation for a resonator with a linewidth of 1.5 MHz, measured at 10 GHz, predicts a discontinuous jump in output power by a factor of about 3.5 as the input power is increased to about 0.7 mW. The phenomenological model that describes the bistability also provides an explanation for the foldover of ferromagnetic resonance curves at high input power levels. An appropriate choice for the operating frequency ensures that the estimated input power required to observe the bistable behavior is below the predicted threshold power for spin-wave auto-oscillations at the main resonance. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370045
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