Guatemala is characterized by low contraceptive use rates and one of the highest fertility rates in the Western Hemisphere. These rates are particularly extreme for the poorest segment of the population and for the indigenous population. However, notable increases in contraceptive use have occurred within the past ten years, indicating that Guatemala may be on the precipice of significant demog...

In this paper, the existence of periodic solutions of a delayed competitive system with the effect of toxic substances is investigated by using the Gaines and Mawhins continuation theorem of coincidence degree theory on time scales. New sufficient conditions are obtained for the existence of periodic solutions. The approach is unified to provide the existence of the desired solutions for the co...

This report supplements the SEI report Evaluation of the Rational Environment (CMU/SEI-88-TR-15) by Peter Feiler, Susan Dart, and Grace Downey. It contains the instantiation of the experiments presented in the Evaluation of Ada Environments by Nelson Weiderman, et al. (see [7]). Overall conclusions and analysis of the Rational Environment can be found in Evaluation of the Rational Environment.

We give an extension to coincidence theory of some key ideas from Nielsen fixed point theory involving remnant properties of free group homomorphisms. In particular we extend Wagner’s theorem for computing Reidemeister classes for Wagner characteristic homomorphisms, which allows us to compute doubly twisted conjugacy classes in many cases. We also extend Kim’s method for homomorphisms with bou...

The relationship between distance measures and asymptotic relative efficiency is discussed. It is shown that the ratio of the Bhattacharyya distance or J divergences of two test statistics is equivalent to asymptotic relative efficiency. Two-input systems are discussed as examples, and the performances of the polarity coincidence correlator (PCC) and the correlator are discussed in terms of the...