The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842 in Prague, is the change in frequency of a wave for an observer moving relative to the source of the wave. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession. The relative changes in frequency can be explained as follows. When the source of the waves is...

Welcome A Short Book Description The movement of an electron around the atomic nucleus has today a great importance in many engineering fields. Electronics, aeronautics, micro and nanotechnology, electrical engineering, optics, lasers, nuclear power, computing, equipment and automation, telecommunications, genetic engineering, bioengineering, special processing, modern welding, robotics, energy and electromagnetic wave field is today only a few of the many applications of electronic engineering. This first chapter presents shortly a new and original relation which calculates the radius with...

Nuclear fusion is the process by which two or more atomic nuclei join together, or -fuse-, to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy which is released. The binding energy of the resulting nucleus is greater than the binding energy of each of the nuclei that fused to produce it. Fusion is the process that powers active stars. Creating the required conditions for fusion on Earth is very difficult, to the point that it has not been accomplished at any scale for protium, the common light...

Teoria Mecanismelor, curs si aplicatii pentru studenti, a ajuns la cea de a doua editie. Cartea prezinta structura, geometria, cinematica, cinetostatica, si dinamica diverselor mecanisme plane, cu analiza si sinteza, cu prezentarea distributiei de forte si viteze, cu determinarea puterilor si a randamentelor, dar si a variatiei dinamice a vitezelor si acceleratiilor (se prezinta noi ecuatii de miscare a masinii). Desi marea majoritate a mecanismelor expuse sunt plane sau cu functionare in plane paralele, sunt introduse si unele notiuni de miscare spatiala (exemplu, cupla universala)....

Teoria Mecanismelor, curs si aplicatii pentru studenti, a ajuns la cea de a doua editie. Cartea prezinta structura, geometria, cinematica, cinetostatica, si dinamica diverselor mecanisme plane, cu analiza si sinteza, cu prezentarea distributiei de forte si viteze, cu determinarea puterilor si a randamentelor, dar si a variatiei dinamice a vitezelor si acceleratiilor (se prezinta noi ecuatii de miscare a masinii). Desi marea majoritate a mecanismelor expuse sunt plane sau cu functionare in plane paralele, sunt introduse si unele notiuni de miscare spatiala (exemplu, cupla universala)....