A new wide‐line NMR analyzer and its use in determining the solid‐liquid ratio in fat samples
A new, simple, inexpensive wide line NMR analyzer is commercially available and suitable for several applications in the oils and fats industry. Its use to determine the solid-liquid ratio in fats has been studied in particular, and it has been found that the solids content of a fat can be determined at four temperatures in approximately one hour. The reproducibility of the measurements is 1% absolute solids. The results obtained are compared with those obtained by dilatometry on the same samples. Several different methods of calculation and operation were tried; differences in the results are given. Arguments for and against four particular methods of calibration are discussed.
During the study of spatial hearing, it is requisite to consider how to properly model the acoustical characteristics of HRTFs (head-related transfer functions: HRTFs) or HRIRs (head-related impulse responses: HRIRs) corresponding to certain positions. In our work, we managed to carry through adaptive non-linear approximation in the field of wavelet transformation. The results show that, the HRIRs' adaptive nonlinear approximation model is a more effective data reduction model, faster and averagely 5 dB better than the traditional PCA (Karhunen-Loeve transform) model based on relative error