We study the 2-D Helmholtz equation in perturbed stratified media, allowing the existence of guided waves. Our assumptions on the perturbing and source terms are not too restrictive. We prove two results. Firstly, we introduce a Sommerfeld-Rellich radiation condition and prove the uniqueness of the solution for the studied equation. Then, by careful asymptotic estimates, we prove the existence ...

the aim of this research is to compare two weight loss methods in 20 to 25- year-old well-trained wrestlers. 30 well-trained wrestlers participated in this research voluntarily and then were randomly divided into two groups. their percentage of body fat (measured with caliper) and strength and endurance of their upper and lower extremities were measured before and after the weight loss program....

Introduction: Adulthood is associated with many challenges which requires adaptability. Differences between adults and the older adults are important to adapt with these challenges and facilitators of adaptation. The present study aimed to determine the difference between the meaning of life and psychological well-being through different age groups of adults, older adults and oldest olds.   M...