Is the phase of plane waves an invariant?

Based on the invariance of the phase of waves, plane waves was shown to propagate with negative frequencies in a medium which moves at superluminal speeds opposite to the propagation direction of plane waves. The validity of the invariance of the phase of plane waves was then called into question. A radical change of the conventional concept of plane waves is recently proposed to solve the problem of negative frequency of waves. Here, we point out flaws in that proposal. Thus, the validity of the invariance of the phase of plane waves remains questionable

Rapid International Expansion Strategy of Emerging Market Enterprises: The Interplay between Speed and Competitive Risks on International performance

Firms that internationalize relatively late may pursue rapid internationalization by entering multiple markets simultaneously to reach global scale faster and to capture early mover advantages. These trends run counter to the theory of incremental internationalization. With data on Korean firms' early international expansion experiences, we found evidence that a rapid international expansion strategy enhances firm performance in industries where globalization pressures are high, by firms with less lead-time of their home-country rivals, and in countries where they could be early movers.incremental internationalization, rapid international expansion strategy, emerging markets, foreign subsidiary survival, foreign direct investment

Junction range finder

Electronic system locates interferences in radar reception. System utilizes well known frequency-modulated continuous-wave technique to locate objects with nonlinear impedances. FM transmitter generates signal through bandpass filter which eliminates higher order harmonics around carrier frequency