• The carbonation process of cement with supercritical CO 2 was reevaluated. Fast, low-cost, and reliable models were obtained to quantify CaCO 3 in by FTIR. effect on the matrix must be considered for development PLS. fractions relevant PLS regression are portlandite, C-S-H. model showed a good correlation coefficient low prediction error. Partial least squares (PLS) developed study material m...

We describe a modification to the most common method of preparing sperm whale teeth for age determination. The first mandibular or nearest straightest tooth was sectioned in half with slow-rotating band saw, polished and, rather than subjecting 10% formic acid 30 hours, etched 15% acid. exposure time each varied depending on size, and especially, density tooth. Clear, well defined growth layer ...

In this investigation, the elements Ca and S were evaluated in a single nail clipping using compact portable X-ray spectrometer model X-123 SDD with Ag target. Experimental conditions for current, voltage excitation time investigated. These analyses can be useful variety of applications, including nutritional medical diagnosis, such as, evaluation bone dysfunctions by measurement (bone decalcif...

It is well known that the administration of acids or of potentially acid salts, such as ammonium chloride, to animals often leads to decalcification. Apparently several factors are involved, such as the age of the animal, the calcium intake, and the disturbance in the acid-base equilibrium. Burns (1) fed hydrochloric acid to rabbits and rats and found that it retarded growth, increased the wate...