Download PDF by I Prigogine: Advances in chemical physics

By I Prigogine

Advances in Chemical Physics, quantity 127 covers fresh advances on the innovative of study relative to chemical physics. The sequence, Advances in Chemical Physics, presents a discussion board for severe, authoritative reviews of advances in each quarter of the self-discipline.

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3 Fundamental properties of zone plates in the millimetre band Zone plates on conical, ogival, parabolical and spherical surfaces were first investigated in detail at millimetre wavelengths by Minin and Minin in 1987–1992. Such diffractive elements were designed both for transforming a flat wavefront into a spherical one and for transforming a spherically divergent wavefront into a spherically convergent one. 2 cm wavelength. The scalar theory of diffraction was chosen as the apparatus with numerical modelling [15].

It is generally advisable to run a numerical experiment for any theoretical study of synthesis and for any analysis of the physical properties of MWDO elements. A numerical experiment makes it possible to forecast the characteristics of the synthesized element, to carry out its optimization and for subtle analysis of the distribution intensity in the area under study until the very moment of physically manufacturing the diffraction element. An interactive system of designing MWDO elements [22, 23] should be based on the modular principle of design and development of application programs, which operates by splitting a problem into individual subproblems that allow a relatively independent development and use of each module.

The main feature of GAs is that they analyse not just one solution but a certain subset of quasi-optimal solutions, known as ‘chromosomes’, or ‘strings’; these solutions also have the ability of escaping from ‘local’ optimums. This subset is called the ‘population’. For each chromosome, one has to calculate the criterion function FðnÞ known as the evolution function, where n is the number of elements in a chromosome. Such functions calculate the relative weight of each chromosome. In each population, chromosomes are subject to various operators.

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Advances in chemical physics by I Prigogine


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