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Now showing items 2140 of 1955

The statistics of energy states of a Hookean model for proteins
(2000)A generic model of a random polypeptide chain, with discrete torsional degrees of freedom and Hookean springs connecting pairs of hydrophobic residues, reproduces the energy probability distribution of real proteins over ... 
Two reflector nonsymmetric shaped antenna systems
(IEEE Computer Society, 2000)Two reflector antenna systems with nonsymmetric reflecting surfaces under GO approximation are investigated. It is shown, that the problem of forming a desired far field pattern leads to solving the system of partial ... 
Representation of speech signals by single signature base function within optimum frame length
(2000)Before this study, we proposed a novel method to represent signals in terms of, so called, “Signature Base FunctionsSBF" which were extracted from the physical features of the waveform under consideration. SBF were ... 
On the realization of optical mappings and transformation of amplitudes by means of an aspherical `thick' lens
(S. Hirzel Verlag GmbH & Co, Stuttgart, Germany, 2000)The constraints for the realization of a given optical mapping by means of an aspherical `thick' lens are investigated by using the laws of geometrical optics. The analysis yields us a partial differential equation which ... 
The Statistics of Energy States of a Hookean Model for Proteins
(2000)A generic model of a random polypeptide chain, with discrete torsional degrees of freedom and Hookean springs connecting pairs of hydrophobia residues, reproduces the energy probability distribution of real proteins over ... 
Joint ML timing and phase estimation in OFDM systems using the EM algorithm
(IEEE, 2000)In this paper, a computationally efficient algorithm is presented for joint maximum likelihood (ML) timing and carrier phase estimation of OFDM systems employing MPSK modulation scheme with additive Gauissian noise, based ... 
Generation of optimum signature base sequences for speech signals
(IEEE, 2000)In our previous publications [16], we proposed a novel method to represent signals in terms of, so called, "Signature Base FunctionsSBF' which were extracted from the physical features of the waveform under consideration. ... 
Analysis of layered media terminated with an impedance surface varying in lateral directions
(SPRINGERVERLAG BERLIN, 2000)Determination of the constitutive parameters of a region from data provided by remote sensing is an extremely interesting and important topic from various points of view. In a large class of problems of this type, the ... 
The concept of confluence and the edge conditions for a wedge bounded by material sheets
(IEEE, 2000)The edge conditions which dictate the asymptotic behaviour of the electromagnetic field near the edges play a crucial role in solving boundaryvalue problems involving boundaries having edges, in analytical studies they ... 
On the contribution of higher order terms to solitary waves in fluid filled elastic tubes
(Birkhauser Verlag, 200001)In the present work, employing the nonlinear equations of an incompressible, isotropic and elastic thin tube and the approximate equations of an incompressible inviscid fluid, the propagation of weakly nonlinear waves, in ... 
A method for higherorder expansion in nonlinear ionacoustic waves
(PergamonElsevier Science, 200003)The basic equations describing the nonlinear ionacoustic waves in a cold collisionless plasma, in the longwave limit, is reexamined through the use of a modified multiplescale expansion method. Expanding the field ... 
Scattering of electromagnetic waves by a rectangular impedance cylinder
(Elsevier Science, 200004)A uniformly valid asymptotic solution is developed for the diffraction of a highfrequency wave by an infinitely long rectangular cylinder having different impedance walls. The incident wave is generated by a line source ... 
Confluent edge conditions for the electromagnetic wave at the edge of a wedge bounded by material sheets
(Elsevier Science, 200007)The edge conditions which dictate the asymptotic behaviour of the electromagnetic field near the edges play a crucial role in solving boundaryvalue problems involving boundaries having edges. In analytical studies they ... 
Modulation of nonlinear axial and transverse waves in a fluidfilled thin elastic tube
(PergamonElsevier Science, 200007)In the present work, utilizing the nonlinear equations of a prestressed thin elastic tube filled with an incompressible inviscid fluid the propagation of weakly nonlinear waves in such a medium is studied. Considering ... 
Dissipative dynamics and the statistics of energy states of a Hookean model for protein folding
(Kluwer Academic PublishersPlenum Publishers, 200007)A generic model of a random polypeptide chain, with discrete torsional degrees of freedom and Hookean spring connecting pails or hydrophobic residues, reproduces the energy probability distribution of real proteins over a ... 
Testing a hypothesis for the evolution of sex
(World Scientific Publishing Company, 20000711)An asexual set of primitive bacteria is simulated with a litstring Penna model with a Fermi function for survival. A recent hypothesis by Jan, Stauffer, and Moseley on the evolution of sex from asexual cells as a strategy ... 
A generalization of the WienerHopf approach to direct and inverse scattering problems connected with nonhomogeneous halfspaces bounded by npart boundaries
(Oxford Univ Press, 200008)The classical WienerHopf method connected with mixed twopart boundaryvalue problems is generalized to cover npart boundaries. To this end one starts from an adhoc representation for the Green function, which involves ... 
On the equilibrium of a rigid body suspended by a set of linear springs
(John Wiley & Sons, 200008)In this paper an approach is described for determining equilibrium states of a rigid body suspended elastically in space by a set of linear springs. This system is considered as a twoterminal generalized spring with ... 
The boundary layer approximation and nonlinear waves in elastic tubes
(PergamonElsevier Science, 200009)In the present work, employing the nonlinear equations of an incompressible, isotropic and elastic thin tube and approximate equations of an incompressible viscous fluid, the propagation of weakly nonlinear waves is examined. ... 
Calculation of the TX phase diagram for a mixture of liquid crystals
(PergamonElsevier Science, 200012)In this study we calculate the TX phase diagram for a mixture of liquid crystals. In this calculation we use a mean field theory We fit our calculated phase line equations to the experimental data from the literature. ...