From the Publisher: The first book devoted solely to Fresnel zones in microwave/mm-wave
electromagnetics, this comprehensive survey covers theory, design and practical …

This paper focuses on changes in food consumption that occurred during the COVID-19
pandemic. Its objective is to map changes at individual consumer level and identify the …

Polyhedral octahydridosilsesquioxanes,[HSiO1. 5] 8 (1) and [(HSiMe2O) SiO1. 5] 8 (3) were
hydrosilylatively copolymerized with stoichiometric amounts of the octavinylsilsesquioxanes …

Epoxy resins absorb significant quantities of moisture, typically 1 to 7% by weight for various
formulations, which can greatly compromise their physical properties. It is known that polarity …

The prediction of wall losses is a fundamental aspect in the planning of cellular systems. The
broad variety of building materials and construction codes makes accurate attenuation …

A new variety of millimeter-wave Fresnel-zone plate lens with enhanced focusing quality is
described. Each full-wave zone of the lens is divided into four quarter-wave subzones, which …

The Eurasian Griffon Vulture Gyps fulvus is a large Palearctic, Indohimalayan and
Afrotropical Old-World vulture. The species' range is vast, encompassing territories from the …

Aim: Vitamin D (VitD) is involved in calcium and phosphate homeostasis, bone health, and
normal functioning of the immune system. VitD status is monitored using serum 25-hydroxy …

Advances in the design of microwave cavity antennas are discussed, surveying both
Western and Soviet work for the period 1950-1988. The fundamental principles and …

Several studies conducted around the world showed substantial vitamin D insufficiency and
deficiency among different population groups. Sources of vitamin D in the human body …