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  • 2000-2004  (4)
  • 1950-1954
  • 1940-1944
  • 2001  (4)
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  • 2000-2004  (4)
  • 1950-1954
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    Wide-range-tunable laterally coupled distributed feedback lasers based on InGaAsP–InP (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2684-2686 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated tunable distributed feedback (DFB) lasers based on InGaAsP quantum wells grown by molecular-beam epitaxy. Two-section tunable DFB lasers were fabricated by patterning laterally gain coupling binary superimposed gratings perpendicular to the ridge waveguide. Side mode suppression ratios of up to 42 dB have been achieved. The tuning range covers 25 nm. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1404397
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enhanced sampling in simulations of dense systems: The phase behavior of collapsed polymer globules (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 630-635 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Slow relaxation due to dense packing encumbers the simulation of a variety of many particle systems like, for instance, collapsed polymers (folded proteins) or structural glasses. We propose to overcome this problem by a new algorithm, assigning each particle a fourth space coordinate and treating an expanded ensemble of systems of which the one with all fourth coordinates equal to zero is the physical system. An application of this simulation strategy to the coil–globule transition of homopolymers using the bond-fluctuation model reveals a hitherto unfound first-order liquid to solid transition of the collapsed globule. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1379763
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nano-dewetting: Interplay between van der Waals- and short-ranged interactions (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 9960-9969 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The wetting behavior of a polymer liquid on a coated substrate is investigated via numerical self-consistent field calculations and experiments. The polymer does not wet the coated substrate, but the substrate might stabilize a mesoscopic film. Experiments observe a stable mesoscopic film of nanometer thickness in coexistence with macroscopic drops at high temperatures. Upon cooling, this mesoscopic polymer film breaks up into droplets (nano-dewetting). Our self-consistent field calculations suggest that the stability of the mesoscopic film is determined by a subtle interplay between van der Waals forces and short-ranged forces due to the distortion of the profile in the vicinity of the substrate. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1413985
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A novel geometric embedding algorithm for efficiently generating dense polymer structures (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 9764-9771 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new algorithm for generating starting polymer structures for molecular simulations (e.g., MD) in dense phase is presented. The algorithm yields structures that fulfill to a large extent rotational isomeric state (RIS) probabilities and avoid atomic overlap. The heuristic search bases on the new parallel-rotation (ParRot) technique. We tested the performance of the algorithm on two polymeric systems: Atomistic polyethylene and polystyrene. The algorithm permits to tackle the problem of packing chains into large boxes of size up to 50 Å in a couple of hours on common workstations. Moreover, our packing algorithm is applicable for general polymer systems. The algorithm requires CPU effort scaling with a power 2.8 in the chain length, and with a power 1.5 in the number of chains. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371480
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    Paper (German National Licenses)
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