54 research outputs found

    Autonomous multispecies reaction-diffusion systems with more-than-two-site interactions

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    Autonomous multispecies systems with more-than-two-neighbor interactions are studied. Conditions necessary and sufficient for closedness of the evolution equations of the nn-point functions are obtained. The average number of the particles at each site for one species and three-site interactions, and its generalization to the more-than-three-site interactions is explicitly obtained. Generalizations of the Glauber model in different directions, using generalized rates, generalized number of states at each site, and generalized number of interacting sites, are also investigated.Comment: 9 pages, LaTeX2

    The Physics of the B Factories

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    Experimental access to Transition Distribution Amplitudes with the PĚ„ANDA experiment at FAIR

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    Bilateral isodense epidural hematoma: case report Hematoma epidural isodenso bilateral: relato de caso

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    We present a case of a severe head injuried 23 year-old male patient. The initial CT scan disclosed bilateral epidural hematoma, isodense with the brain, thus being a pitfall in diagnosis. Brief case report, image and literature rewiew are presented.Apresentamos o caso de um homem de 23 anos com traumatismo craniano grave. A TC de crânio demonstrou um volumoso hematoma epidural bilateral, isodenso com o cérebro, sendo uma armadilha ao diagnóstico. São apresentados um breve relato, estudo da imagem tomográfica e revisão da literatura

    Demography of fluctuating populations: temporal and phase-related changes in vital rates of Microtus ochrogaster

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    1. Small mammal population fluctuations, cyclic or not, have been an ecological puzzle and a source of heated debate among ecologists. Identifying the demographic parameters that covary closely with density changes can help elucidate the underlying causes of population fluctuations, but few studies have reported rigorous estimates of these parameters. 2. We applied capture-mark-recapture analysis to twice-weekly trapping data from a long-term study of a fluctuating Microtus ochrogaster (prairie vole) population in Illinois, USA to estimate stage-specific apparent survival and maturation rates. We also estimated population density, fecundity rate, age at maturity and life span on a weekly basis. 3. Survival, maturation and fecundity rates exhibited phase-related changes during major density fluctuations, but they showed density-independent temporal variations during the prolonged low-density phases. Among these variables, maturation and juvenile survival rates covaried most closely with population density. 4. These results suggest that phase-related changes in maturation and juvenile survival rates are likely to be the main demographic factors driving the dynamics of our study population. 5. Phase-related changes in maturation rates provide a plausible demographic explanation of density fluctuations in our study population. Our results suggest that direct predation may not be necessary for large-scale fluctuations in M. ochrogaster abundance
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