R. Pernas García

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A chemical precipitation method is utilized to synthesize bismuth-strontium-calcium-copper oxide powder. Tetra-methyl ammonium hydroxide and tetra-methyl ammonium carbonate are used as a precipitant and for pH adjustment. Effect of processing parameters like carbonization time, and cation solution concentration on Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/(More)
The sectional matrix is the best way to achieve a strong contact point in Class II restorations with composite resin in the posterior dental sector. The pre-wedging is essential to get a separation between teeth which avoid the matrix deformation during its insertion. This article describes the clinical technique for restoring Class II cavities using a(More)
The magnetic dynamics of Fe<sub>71</sub> Al<sub>29</sub>(x = 71) and Fe<sub>70</sub> Al<sub>30</sub>(x = 70) are analyzed. The alloys have been prepared by milling and further annealing. AC-susceptibility has been measured from 5 K to 300 K at several frequencies between 100 and 10 kHz with an alternating field of 0.1 Oe. In x = 70, additional(More)
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