Testing of loop heat pipes showed that the heat-load dependence operating temperature was not always unambiguous. It may have hysteresis phenomena. The had a certain relationship with previous history power variation, and also related to initial parameters pipes. has been found gas-liquid distribution in compensation chamber which depended on interaction between leak evaporator reflux liquid fr...

We consider three mechanisms of hysteresis phenomena in alternating magnetic field: the domain-wall motion in a random medium, the nucleation, and the retardation of magnetization due to slow ~critical! fluctuations. We construct a quantitative theory for all these processes. The hysteresis is characterized by two dynamic threshold fields, a coercive field and the so-called reversal field. Thei...

Synthesis of BaFe12O19 magnetic nano particles via precipitation in different pH conditions have been reported. The certain molar ratio of Fe/Ba = 12 selected and sodium hydroxide was used as a precipitant agent. X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and vibrating sample magnetometer (VSM) were used to consider the structural, morphological and magnetic properties of bariu...