Youth sports club is a main place that contemporary youth to take sports fitness exercises and complete sports activities, due to clubs offer to sports enthusiasts and are convenient to exchange sports experiences, are popular among youth. Therefore, further develop and perfect youth sports club has become one of important tasks in current stage youth physical education. The paper starts from i...

Club drugs are substances commonly used at nightclubs, music festivals, raves, and dance parties to enhance social intimacy and sensory stimulation. The most widely used club drugs are 3,4-methylenedioxymethamphetamine (MDMA), also known as ecstasy; gamma-hydroxybutyrate (GHB); flunitrazepam (Rohypnol); and ketamine (Ketalar). These drugs are popular because of their low cost and convenient dis...

We study a system where a service is shared by many identical customers; the service is provided by a single resource. As expected each customer experiences congestion, a negative externality, from the others’ usage of the shared resource in our model. In addition, we assume each customer experiences a positive externality from others’ usage; this is in contrast to prior literature that assumes...

in this paper, the formation of club convergence among real per capita gdp of iran’s provinces is tests through use of non-parametric quantile regression and distribution dynamics approach. the results show two convergence clubs are forming among provinces and most of them are converging toward poor club. also, calculation of convergence speed shows that there is a vast difference among economi...

The report presents the cellular structure of the respiratory system as well as the history of club cells (Clara cells), their ultrastructure, and location in the airways and human organs. The authors discuss the biochemical structure of proteins secreted by these cells and their importance for the integrity and regeneration of the airway epithelium. Their role as progenitor cells for the airwa...

Rich-club and page-club coefficients and their null models are introduced for directed graphs. Null models allow for a quantitative discussion of the rich-club and page-club phenomena. These coefficients are computed for four directed real-world networks: Arxiv High Energy Physics paper citation network, Web network (released from Google), Citation network among US Patents, and Email network fr...