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  • Springer  (9)
  • Cold Spring Harbor Laboratory Press  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Stationary soliton states in couplers with saturable nonlinearity (1995)
    Springer
    Optical and quantum electronics 27 (1995), S. 193-200 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We find the possible stationary states for nonlinear couplers formed from materials that have saturable nonlinearities. We also determine the effect of saturation on the asymmetric state bifurcation point and the energy required for switching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00563224
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optimum design of adiabatic weakly guiding nonlinear optical fibre tapers (1991)
    Springer
    Optical and quantum electronics 23 (1991), S. 1179-1188 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We investigated the design features of adiabatic, weakly guiding optical fibre tapers for nonlinear device applications. In general, where the fibre taper ‘core’ and ‘cladding’ are of different material nonlinearities, the nonlinear effects that can be achieved depend critically on the taper parameters. For optical switches a suitable choice of taper parameters minimizes the power × length product for nonlinear operation. The maximum effective utilization of the nonlinear cladding material was found to be 21.3%. Also, nonlinear effects can be totally suppressed with an appropriate choice of design, enabling nonlinear effects that are undesirable in some applications to be avoided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00619986
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optical switching in a coupler with saturable nonlinearity (1994)
    Springer
    Optical and quantum electronics 26 (1994), S. S365 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstact We report in this paper a numerical study of optical switching in couplers with saturable nonlinearity. Regions that characterize different coupling behaviour are revealed. It is shown that, in the presence of saturation, a Gaussian pulse should be used instead of solitons for negligible pulse splitting between the coupler arms. Nearly complete switching is possible depending on the input optical power and the index saturation parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384686
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Generalized Gaussian analysis of fibres with non-Kerr-law nonlinearities (1993)
    Springer
    Optical and quantum electronics 25 (1993), S. 147-155 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We provide analytic results for fibres with non-Kerr-law nonlinearities and saturation, using an accurate and versatile approach — the generalized Gaussian analysis. These results can be useful in analysis and design of nonlinear devices using fibres with non-Kerr-law or saturable nonlinearity. In the case of nonlinear fibre tapers, for example, we show how optimum design parameters can be found for various forms of nonlinearity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420410
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  • 5
    Electronic Resource
    Electronic Resource
    Anomalous loss in depressed-cladding and W-fibres (1993)
    Springer
    Optical and quantum electronics 25 (1993), S. 409-416 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Anomolous spikes in the loss spectrum of practical depressed-cladding fibres with a finite cladding and absorbing jacket can be explained in terms of a combination of three effects — the excitation conditions, the absorption behaviour of core and cladding modes, and the slight variation in the fibre diameter along its length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420582
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Cu doping at the Mn site on the transport aaand magnetic behaviors of La 2/3 Ca 1/3 MnO3 (2001)
    Springer
    The European physical journal 20 (2001), S. 177-181 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.30.Vn Colossal magnetoresistance – 75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) – 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We show that the replacement of Mn with Cu, without any structure change, strongly affects the transport and magnetic behaviors in La 2/3 Ca 1/3 Mn1-xCuxO 3 - δ (x ?0.3). Doping largely shifts the insulator-metal transition towards the low-temperature regime and causes substantial enhancements in both resistance and magnetoresistance near the transition for doping range of x ? 15%, and further doping to x ≥ 20% shows insulating behavior. For 15% doping, the sample shows large magnetoresistances (∼104%) over the whole low temperature range. Magnetization measurement at helium temperature reveals that samples for x ? 10% and ≥ 20% basically show ferromagnetic (FM) and antiferromagnetic (AF) behaviors, respectively, while the 15% Cu doped sample undergoes a metamagnetic transition from AF state to FM state on increasing field. We argue that doping introduces the AF insulating phase into the system, causing unusual transport and magnetic behaviors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01315688
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Connections of the West Pacific subtropical high and some hydroclimatic regimes in China with Antarctic ice-snow indices (1987)
    Springer
    Meteorology and atmospheric physics 37 (1987), S. 61-71 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary On the basis of 10 years monthly and long-term annual data the importance of the antarctic ice-snow cover and correlated indices has been discussed. By computing time-lag correlation analyses of the ice-snow indices and different atmospheric indices of the northern hemisphere and some hydroclimatic regimes in China, it could be shown that a close relationship between sea-ice in the Antarctic and the intensity and area indices of the subtropical West Pacific high exists. It was also possible to prove a close relationship between antarctic ice-snow indices and the annual run-off of the Yellow River at Sanmenxia, and between rainfall over North China and the lower sections of the Yellow river.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01040839
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    A dynamical model for reflex activated head movements in the horizontal plane (1996)
    Springer
    Biological cybernetics 75 (1996), S. 309-319 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract.  We present a controls systems model of horizontal-plane head movements during perturbations of the trunk, which for the first time interfaces a model of the human head with neural feedback controllers representing the vestibulocollic (VCR) and the cervicocollic (CCR) reflexes. This model is homeomorphic such that model structure and parameters are drawn directly from anthropomorphic, biomechanical and physiological studies. Using control theory we analyzed the system model in the time and frequency domains, simulating neck movement responses to input perturbations of the trunk. Without reflex control, the head and neck system produced a second-order underdamped response with a 5.2 dB resonant peak at 2.1 Hz. Adding the CCR component to the system dampened the response by approximately 7%. Adding the VCR component dampened head oscillations by 75%. The VCR also improved low-frequency compensation by increasing the gain and phase lag, creating a phase minimum at 0.1 Hz and a phase peak at 1.1 Hz. Combining all three components (mechanics, VCR and CCR) linearly in the head and neck system reduced the amplitude of the resonant peak to 1.1 dB and increased the resonant frequency to 2.9 Hz. The closed loop results closely fit human data, and explain quantitatively the characteristic phase peak often observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004220050297
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  • 9
    Electronic Resource
    Electronic Resource
    Random copolymers at a selective interface: Many chains with excluded volume interactions (1999)
    Springer
    The European physical journal 8 (1999), S. 73-79 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling - 83.70.Hq Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We investigate numerically, using the bond-fluctuation model, the adsorption of many random AB-copolymers with excluded volume interactions at the interface between two solvents. We find two regimes, controlled by the total number of polymers. In the first (dilute) regime, the copolymers near the interface extend parallel to it, while in the second regime they extend perpendicular to it. The density at the interface and the density in the bulk depend differently on the total number of copolymers: In the first regime the density at the interface increases more rapidly than in the bulk, whereas the opposite is true in the second regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050670
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  • 10
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    Regulation of Mec1 kinase activity by the SWI/SNF chromatin remodeling complex [Research Papers] (2015)
    Cold Spring Harbor Laboratory Press
    Details
    Publication Date: 2015-03-20
    Description: ATP-dependent chromatin remodeling complexes alter chromatin structure through interactions with chromatin substrates such as DNA, histones, and nucleosomes. However, whether chromatin remodeling complexes have the ability to regulate nonchromatin substrates remains unclear. Saccharomyces cerevisiae checkpoint kinase Mec1 (ATR in mammals) is an essential master regulator of genomic integrity. Here we found that the SWI/SNF chromatin remodeling complex is capable of regulating Mec1 kinase activity. In vivo, Mec1 activity is reduced by the deletion of Snf2, the core ATPase subunit of the SWI/SNF complex. SWI/SNF interacts with Mec1, and cross-linking studies revealed that the Snf2 ATPase is the main interaction partner for Mec1. In vitro, SWI/SNF can activate Mec1 kinase activity in the absence of chromatin or known activators such as Dpb11. The subunit requirement of SWI/SNF-mediated Mec1 regulation differs from that of SWI/SNF-mediated chromatin remodeling. Functionally, SWI/SNF-mediated Mec1 regulation specifically occurs in S phase of the cell cycle. Together, these findings identify a novel regulator of Mec1 kinase activity and suggest that ATP-dependent chromatin remodeling complexes can regulate nonchromatin substrates such as a checkpoint kinase.
    Print ISSN: 0890-9369
    Topics: Biology
    Published by Cold Spring Harbor Laboratory Press
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