Twelve-year-old Dahlia has always lived at Silverton Manor-having spent fifty years as its resident ghost. When Oliver Day and his family show up as house-sitters the day Mrs. Tibbs, a Liberator sent by the Spectral Investigative Council, arrives to teach Dahlia the proper rules for ghosting, Dahlia can't wait to make new friends. But the unscrupulous ghost hunter, Rank Wiley, and the crooked town councilman, Jock Rutabartle, plan to rid Silverton Manor of its ghosts and sell it to the highest bidder. With her home and friendships at stake Dahlia may have to break the rules of ghosting as quickly as she learns them to solve the mystery of her death and save the manor. Equal parts charming and eerie, this ghostly caper hits all the right notes for the middle-grade audience.
The term "control theory" refers to the body of results - theoretical, numerical and algorithmic - which have been developed to influence the evolution of the state of a given system in order to meet a prescribed performance criterion. Systems of interest to control theory may be of very different natures. This monograph is concerned with models that can be described by partial differential equations of evolution. It contains five major contributions and is connected to the CIME Course on Control of Partial Differential Equations that took place in Cetraro (CS, Italy), July 19 - 23, 2010. Specifically, it covers the stabilization of evolution equations, control of the Liouville equation, control in fluid mechanics, control and numerics for the wave equation, and Carleman estimates for elliptic and parabolic equations with application to control. We are confident this work will provide an authoritative reference work for all scientists who are interested in this field, representing at the same time a friendly introduction to, and an updated account of, some of the most active trends in current research.
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