English-Russian dictionary of planing, cross-planing and slotting machines. общая редакция - Полюхин В.М.. 2015.
Ionosphere — The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner … Wikipedia
History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… … Wikipedia
Ionosphäre — Beziehung von Ionosphäre und Erdatmosphäre … Deutsch Wikipedia
List of astronomy acronyms — This is a compilation of acronyms commonly used in astronomy. Most of the acronyms are drawn from professional astronomy and are used quite frequently in scientific publications. However, a few of these acronyms are frequently used by the general … Wikipedia
Nikola Tesla — Tesla, aged 37, 1893, photo by Sar … Wikipedia
Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… … Universalium
Birkeland current — Schmatic of the Birkeland or Field Aligned Currents and the ionospheric current systems they connect to.[1] A Birkeland current is a set of currents which flow along geomagnetic field line connecting the Earth’s magnetosphere to the Earth s hi … Wikipedia
4-metre band — 4 metres (4 m, 70 MHz) is an amateur radio frequency band in the lower Very High Frequency spectrum. Traditionally allocated only in a small number of countries in Europe and Africa, the decline in VHF television broadcasts, movement away from… … Wikipedia
