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  • 1
    Electronic Resource
    Electronic Resource
    Hot Days in 1911 (1911)
    [s.l.] : Nature Publishing Group
    Nature 87 (1911), S. 515-516 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MR. MACDOWALL'S letter in NATURE of October 12 (p. 485), in which he directs attention to certain features in the sequence of annual number of hot days at Greenwich, is interesting. Nevertheless, I think he himself will acknowledge that his example, viz. the summer of 1911, is a happy one. What ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/087515b0
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  • 2
    Electronic Resource
    Electronic Resource
    Biological Sciences: Lamellar Structure of Bleached and Unbleached Rod Photoreceptor Membranes (1972)
    [s.l.] : Nature Publishing Group
    Nature 237 (1972), S. 229-231 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At the same time X-ray diffraction studies were in progress in my laboratory to determine the disk membrane profile, and the location of rhodopsin within this profile, in an effort to resolve the discrepancies in interpretation. It was first hoped to phase the reflexions by sampling the continuous ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/237229a0
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  • 3
    Electronic Resource
    Electronic Resource
    Orientation of acidic polysaccharides and rhodopsin-oligosaccharides in frog retinal rod outer segments (1978)
    Springer
    Histochemistry and cell biology 56 (1978), S. 65-77 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using topo-optical staining reactions, the presence and molecular order of three structural components of outer segments of frog retina were studied. These components included (1) an acidic polysaccharide texture, (2) free aldehyde groups which arise during formalin fixation and (3) the oligosaccharide chains of rhodopsin. Quantitative measurements of the dye binding and birefringence effects arising from the individual structural components in rod outer segments were made. Results indicated that all three structural components had a rather well-defined orientation within the ROS. The spherulites phagocytized from the apical ends of ROSs by the pigment epithelium also demonstrate preferred orientation of the three structural components investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00492254
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  • 4
    Electronic Resource
    Electronic Resource
    Stress moments of nearly touching spheres in low Reynolds number flow (1988)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 39 (1988), S. 874-884 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract If two spheres are nearly touching, and the flow around them is governed by the Stokes equations, the integral moments of the surface stress are singular functions of the gap width. The method used previously to calculate the singular terms in the zeroth moment (the force) and the antisymmetric first moment (the couple) is extended here to calculate the singular terms in the symmetric first moment (the stresslet) for motions perpendicular to the line of centres. It is shown that the reciprocal theorem requires unexpected relations between the newly found singularities and ones found previously. It is also shown that the singular terms can be used to improve the rate of convergence of series expressions for the stresslets. The series expressions then become valid for all separations of the spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00945124
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  • 5
    Electronic Resource
    Electronic Resource
    Suboptimal Control of Rigid Body Motion with a Quadratic Cost (1998)
    Springer
    Dynamics and control 8 (1998), S. 55-81 
    Details
    ISSN: 1573-8450
    Keywords: Rigid body ; quadratic cost ; Lyapunov functions ; Linear matrix inequalities ; stabilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In this paper we consider the problem of controlling the rotational motion of a rigid body using three independent control torques. Given a quadratic cost we seek stabilizing state feedback controllers which guarantee that all motions starting within a specified bounded set have cost less than a given number; i.e., we seek suboptimal stabilizing controllers. For a special class of cost functions, we present explicit expressions for suboptimal stabilizing controllers yielding a cost arbitrarily close to the infimal cost. For the general case, we present sufficient conditions which guarantee the existence of linear, suboptimal, stabilizing controllers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008278929841
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  • 6
    Electronic Resource
    Electronic Resource
    Asymptotic stability of singularly perturbed systems that have marginally stable boundary-layer systems (1991)
    Springer
    Dynamics and control 1 (1991), S. 95-108 
    Details
    ISSN: 1573-8450
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A class of linear singularly perturbed systems with singular perturbation parameter µ 〉 0 is considered. To assure asymptotic stability of the full-order system for sm 〉 0 sufficiently small, it is customary to require that both the reduced-order system (µ = 0) and the boundary-layer system are asymptotically stable. Here we relax the requirement on the boundary-layer system to stability (i.e., stability, but not necessarily asymptotic stability) and show that, subject to one additional condition, the full-order system is asymptotically stable for sufficiently small µ. The result is illustrated by an application in which we consider the stability robustness of a feedback-controlled mechanical system with respect to an unmodeled flexibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02169427
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  • 7
    Electronic Resource
    Electronic Resource
    Stabilizing uncertain systems with bounded control (1991)
    Springer
    Dynamics and control 1 (1991), S. 227-238 
    Details
    ISSN: 1573-8450
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract We consider the problem of stabilizing an uncertain system when the norm of the control input is bounded by a prespecified constant. We treat continuous-time dynamical systems whose nominal part is linear and whose uncertain part is norm-bounded by a known constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02169679
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  • 8
    Electronic Resource
    Electronic Resource
    Destabilization via Active Stiffness (1997)
    Springer
    Dynamics and control 7 (1997), S. 263-268 
    Details
    ISSN: 1573-8450
    Keywords: Structural control ; active control ; stability ; instability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In a recent paper leit one of the authors noted, without presenting aproof, that appropriate variation of the stiffness coefficient in amass-spring-damper system leads to increase of the system energy during acycle of the motion. Some have expressed doubt concerning the validity ofthis claim which implies that a damped simple oscillator can be destabilizedby varying the spring constant. It is the purpose of this note to present aproof.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008246401742
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  • 9
    Electronic Resource
    Electronic Resource
    On the LambertW function (1996)
    Springer
    Advances in computational mathematics 5 (1996), S. 329-359 
    Details
    ISSN: 1572-9044
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The LambertW function is defined to be the multivalued inverse of the functionw →we w . It has many applications in pure and applied mathematics, some of which are briefly described here. We present a new discussion of the complex branches ofW, an asymptotic expansion valid for all branches, an efficient numerical procedure for evaluating the function to arbitrary precision, and a method for the symbolic integration of expressions containingW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02124750
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  • 10
    Electronic Resource
    Electronic Resource
    Symbolic computation in nonlinear dynamics (1995)
    Springer
    Open systems & information dynamics 3 (1995), S. 131-147 
    Details
    ISSN: 1573-1324
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Natural Sciences in General
    Notes: Abstract This paper gives examples of how computer algebra systems can help us to understand nonlinear dynamical systems and their numerical simulations. We caution against naive use of exact arithmetic, but we give examples where elementary use is helpful. We also look at the use of polynomial computations — such as factoring, computation of discriminants, and Gröbner bases — in bifurcation studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02228812
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