Scattering problems of the SH Wave by Using the Null-Field Boundary Integral Equation Method

The scattering problem of seismic waves is an important issue for studying earthquake engineering. In this paper, the null-field boundary integral equation approach was used in conjunction with degenerate kernels and eigenfunction expansion to solve the SH-wave scattering problem of a circular or an elliptical-arc hill. The original problem is divided into subdomains by taking a free-body diagram. One region is an interior boundary value problem. The other is a canyon scattering problem. For the boundary value problem, not only a simply connected domain (elliptical-arc hill problem) but also a doubly connected domain (a circular-arc hill problem containing a circular tunnel or a circular inclusion) is considered. The canyon scattering problem may be addressed in an infinite domain with an artificial boundary of a full plane such that the degenerate kernel can be fully utilized. The null-field integral equation method is used to match boundary conditions. Numerical results are compared favorably with the available data.     

James Connolly on stage: history,imagination, and interpretations

James Connolly (1868–1916) has been an underrepresented figure in Irish history, despite the fact that he was one of the signatories of the Proclamation of the Irish Republic. The controversy surrounding Connolly centres mostly on his questionable role in this radical nationalist siege, even though he had been one of the most prolific Marxist theorists of his day. Interestingly, Connolly’s political ambivalence has yielded plenty of scope for the imagination of playwrights in envisaging his final few days before he was executed by the British government. Their theatrical conjectures – backed by archival research to varying degrees – allow audiences different alternatives for learning about, interpreting, assessing, or even celebrating, the legacy of this controversial Marxist. Most importantly, they are able to look beyond the selectiveness of historians in re-creating Connolly as a material figure. The three plays under discussion are Margaretta D’Arcy and John Arden’s The Non-stop Connolly Show (1975), Larry Kirwan’s Blood (1993), and Terry Eagleton’s The White, the Gold and the Gangrene (1993).