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It has been my privilege and pleasure during the past half century to participate in the unfolding of present-day concepts of the mammalian female reproductive cycles. When the studies recorded here began in the late 1930s it was already established that cyclic ovarian function is governed by gonadotropic secretions from the anterior pituitary gland, the "conductor of the endrocrine orchestra," and that in turn this activity is importantly dependent in some way upon secretion of estroÂ gens and progesterone by the ovaries. Although a role of the nervous system was recognized for the reflex-like induction of ovulation in rabbits and cats and the inÂ duction of pseudopregnancy in rats and mice, and although there was even some evidence of neural participation in ovulation in rats, a major central neural role in the female cycle of most species was not apparent. Gonadotropic fractions of pituiÂ tary extracts having distinct follicle-stimulating and luteinizing activities in test aniÂ mals had been obtained, and these respective effects had been fairly well characÂ terized. Prolactin was well known for its lactogenic activity, but its luteotropic role in rats and mice had yet to be revealed. The molecular structure of the several estroÂ gens and progesterone was known, and they were readily available as synthetic proÂ ducts. The broad concept of ovarian-pituitary reciprocity appeared to be an acceptÂ able explanation of the female cycle, with the ovary in control through the rhythmic rise and fall in secretion of follicular estrogen.
The book is devoted to exploring the foundations of the theory of thin impedance vibrator antennas. The text provides a continuation of the classic theory of thin perfectly conducting vibrators. Many consider impedance conception one of the most universal models in the theory of wave processes, as it informs such a wide spectrum of uses in solving practical problems of electrodynamics. This topic provides an opportunity to further search analytical solutions, allowing a simplification of the mathematical formulation of the boundary problem. The theory strives to widen the boundaries of the impedance vibrator antennas application in complex modern radio-and-electronic systems and devices. The results of much original research conducted by the authors will be useful for practicing engineers and designers of antenna and waveguide systems. The book is written in an academic style, and can be used to teach students and post graduates about radiotechnical and radiophysical specialities. The conclusion of the book lists many actual applied problems, which can provide inspiration for several potential PhD projects. Topics covered in this book are: *general questions of the theory of impedance vibrators in the spatial-frequency representation *electromagnetic waves radiation by impedance vibrators in free space and material mediums *electromagnetic waves radiation by impedance vibrators in material mediums over the perfectly conducting plane *electromagnetic waves scattering by irregular impedance vibrators in free space *generalized method of induced electromotive forces for investigation of the characteristics of impedance vibrators *radiation of electromagnetic waves by radial impedance vibrators on the perfectly conducting sphere *electromagnetic waves scattering by impedance vibrators in the rectangular waveguide
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