We study the crossover scaling behavior of the height-height correlation function in interface depinning in random media. We analyze experimental data from a fracture experiment and simulate an elastic line model with nonlinear couplings and disorder. Both exhibit a crossover between two different universality classes. For the experiment, we fit a functional form to the universal crossover scal...

We study crossover phenomena in a model of self-avoiding walks with medium-range jumps, which corresponds to the limit N-->0 of an N-vector spin system with medium-range interactions. In particular, we consider the critical crossover limit that interpolates between the Gaussian and the Wilson-Fisher fixed point. The corresponding crossover functions are computed by using field-theoretical metho...

Genetic algorithms (GAs) are an optimization technique that has been successfully used on many real-world problems. There exist different approaches to their theoretical study. In this paper we complete a recently presented approach to model one-point crossover using pretopologies (or Čech topologies) in two ways. First, we extend it to the case of n-points crossover. Then, we experimentally st...

During meiosis, homologous chromosomes pair to facilitate the exchange of DNA at crossover sites along the chromosomes. The frequency and distribution of crossover formation are tightly regulated to ensure the proper progression of meiosis. Using immunofluorescence techniques, our group and others have studied the meiotic proteins in spermatocytes of infertile men, showing that this population ...

The genetic algorithm (GA) is an optimization and search technique based on the principles of genetics and natural selection. A GA allows a population composed of many individuals to evolve under specified selection rules to a state that maximizes the “fitness” function. In that process, crossover operator plays an important role. To comprehend the GAs as a whole, it is necessary to understand ...

سخن سردبیر Editorial مجله دانشگاه علوم پزشکی رفسنجان دوره هجدهم، شهریور 1398، 513-514     مطالعات مورد – همگذری (Case Crossover Studies)   محسن رضائیان[1]   M. Rezaeian   مطالعات مورد - همگذری (Case Crossover Studies) به ویژه برای مشخص کردن تأثیر زودگذر مواجهه بر روی رخداد یک بیماری حاد، مناسب است. در این طراحی، به جای آن‌که یک گروه مجزا برای کنترل انتخاب  شود، هر مورد در نقش کنترل ...