this paper investigates a discrete-time impatient customer queue with bernoulli-schedule vacation interruption. the  vacation times and the service times during regular busy period and during working vacation period are assumed to follow geometric distribution. we obtain the steady-state probabilities at arbitrary and outside observer's observation epochs using recursive technique. cost an...

different competitor weed fungi rhizopus stolonifer, penicillium glabrum, fusarium oxysporum and coprinopsis kimurae were found to have associated with the fruit beds as constant contaminants of pleurotus sajor-caju and lentinula edodes. several antagonists, plant extracts and chemicals were tested against the weed fungi to screen the most effective ones and to have an integrated combination fo...