Grating displacement measurement technique is an important means to achieve precise displacement measurement of nanometer scale. Moiré fringe phase difference measurement is the basis of grating displacement measurement technique. Traditional Moiré fringe subdivision method based on DFT algorithm has low frequency resolution relatively when extracting Moiré fringe fundamental frequency spectral...

A critical review of all beam-reversal phase-shift measurements carried out on NBS-6 (NBS-5) since 1973 is presented. The analysis takes into account a recent study of frequency shifts in atomic-beam frequency standards resulting from overlapping tails of adjacent lines. A strongly correlated variation of the cavity phase difference with time is shown, which appears to fit nicely on an exponent...

The present study compares the performance of the weighted mean (WM) and sensitivity encoding (SENSE) methods for reconstructing phase difference images over a large range of signal-to-noise ratio (SNR). It is found that the WM algorithm is suboptimal, compared to the SENSE method at low SNR. Numerical simulations, phantom and in vivo results are presented.

background satisfaction with health care is an important criterion and variable in assessing the quality of medical care. especially mother’s satisfaction from childbirth care procedure is a determinant factor in psychological and social health the study aimed to assess mothers’ satisfaction in terms of education and information provided by maternal care givers. material and methods a descripti...

The relevance of our definition for sensitivity in refractometric sensing, being the relative change of the transmittance of a certain output channel of an optical device over the change of the refractive index of the probed material, is discussed. It is compared to one based on spectral shift per refractive index unit change. Further, it is discussed how group delay and sensitivity are interre...

This paper describes a new subgridding approach with a view to improving the efficiency of full-wave simulation of electronic circuits. The proposed subgridding method has been incorporated into a full-wave variable-mesh finite-difference transmission line matrix (FD-TLM) simulator. By incorporating the proposed subgridding method, a speed-up of about 2 has been attained. The computational acce...

The origin of the spurious interface velocity in finite difference lattice Boltzmann models for liquid vapor systems is related to the first order upwind scheme used to compute the space derivatives in the evolution equations. A correction force term is introduced to eliminate the spurious velocity. The correction term helps to recover sharp interfaces and sets the phase diagram close to the on...