The entanglement of Dirac fields has been shown to decrease with increasing acceleration when a quantum state is shared between an inertial and uniformly accelerated observer. A new form entangled vacuum observed by the observer postulated in which it assumed that present modes field sharp opposite momenta defined two causally disconnected regions space-time. We find this assumption does not af...

In this paper, we propose a new chaos-based communication scheme using the observers. The novelty lies in the masking procedure that is employed to hide the confidential information using the chaotic oscillator. We use a combination of the addition and inclusion methods to mask the information. The performance of two observers, the proportional observer (P-observer) and the proportional integra...

introduction: the image quality as well as film speed is influenced by the film processing conditions. different combinations of films and processing methods affect the diagnostic accu-racy. temperature and developer exhaustion result in different image quality. the purpose of this study was to evaluate the influence of film type and processing conditions on caries detec-tion.  material and met...

Abstract In this paper chromatic discrimination thresholds of normal colour-observers are analysed. Measurements were obtained with the Cambridge Colour Test, in different reference points. The results show differences terms chromaticities. Reference points within gamut a CRT display found where colour observers measured towards confusion exceeded normative upper threshold limit observers. esti...