As a nuclear track detector, CR-39 (polyallyl diglycol carbonate) is used to reveal the products of fusion reactions. Positioned around the OMEGA target chamber, pieces of CR-39 absorb and are damaged by ejected particles. The plastic is then etched in NaOH solution at 80°C for 6 hours, resulting in the formation of nuclear tracks visible under a digital microscope. The etching process also rev...

1 Department of Mathematics, Darmstadt University of Technology Schlossgartenstrasse 7, D-64289 Darmstadt, Germany [email protected] 2 Institute of Mathematics ”Simion Stoilow” of the Romanian Academy P.O. Box 1-462, Bucharest, Romania Currently: Department of Mathematics, Darmstadt University of Technology Schlossgartenstrasse 7, D-64289 Darmstadt, Germany leustean@mathemat...

In this note, we establish a mass formula for self-orthogonal codes over Zp2, where p is a prime. As a consequence, an alternative proof of the known mass formulas for self-dual codes over Zp2 is obtained. We also establish a mass formula for even quaternary codes, which includes a mass formula for Type II quaternary codes as a special case. On study leave from the Institute of Mathematics, Uni...

The ion exchange of Na for Cr/K, Cr/Mg and Cr/Ca in Y and X zeolites was studied using breakthrough curves. It was observed that Cr ions were able to remove some competitive ions that had already been exchanged at the zeolitic sites, producing a sequential ion exchange. Some mass transfer parameters such as length of unused bed, overall mass transfer coefficient, operational ratio and dimension...

OBJECTIVE To examine whether long-term measures of cortisol predict Alzheimer disease (AD) risk. METHOD We used a prospective longitudinal design to examine whether cortisol dysregulation was related to AD risk. Participants were from the Baltimore Longitudinal Study of Aging (BLSA) and submitted multiple 24-hour urine samples over an average interval of 10.56 years. Urinary free cortisol (UF...