Propagation dynamics on networks featuring complex topologies

Analytical description of propagation phenomena on random networks has flourished in recent years, yet more complex systems have mainly been studied through numerical means. In this paper, a mean-field description is used to coherently couple the dynamics of the network elements (nodes, vertices, individuals...) on the one hand and their recurrent topological patterns (subgraphs, groups...) on the other hand. In a SIS model of epidemic spread on social networks with community structure, this approach yields a set of ODEs for the time evolution of the system, as well as analytical solutions for the epidemic threshold and equilibria. The results obtained are in good agreement with numerical simulations and reproduce random networks behavior in the appropriate limits which highlights the influence of topology on the processes. Finally, it is demonstrated that our model predicts higher epidemic thresholds for clustered structures than for equivalent random topologies in the case of networks with zero degree correlation.Comment: 10 pages, 5 figures, 1 Appendix. Published in Phys. Rev. E (mistakes in the PRE version are corrected here

Synthesis of cyclopropyl-substituted furans by Brønsted acid promoted cascade reactions

Chloroacetic acid promotes an efficient and diastereoselective intramolecular cascade reaction of electron-deficient ynenones to deliver products featuring a 2,3,5-trisubstituted furan bearing a fused cyclopropyl substituent at the 5-position. Synthetically relevant polycyclic building blocks featuring rings of various sizes and heteroatoms have been synthesized in high yield using this mild acid-catalyzed reaction

Tea Time: knitting circle

Weekly Tea Time program featuring the topic "Knitting circle"Boston University Howard Thurman Center for Common Groun

Coffee and Conversation: reflections of the Civil Rights movement

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Human Rights Week 2009

The Annual Human Rights Week featuring documentaries, conversations, and guest lecturers

On Money, Politics & Corruption: Scholar, Activist Lawrence Lessig to visit RWU on Feb. 23

Public invited to free President’s Distinguished Speakers Series event featuring acclaimed free thinker and visionary

WHORL

Art magazine featuring the creative work of students, faculty and staff of the Boston University Medical Campus and Boston University Medical Cente