Problems in great depths construction.

Problems, problems, problems:The social construction of ‘leadership’

A B S T R AC T The invasion of Iraq was premised upon accounts of the situation that have proved unsustainable, but that has not generated a change in the strategy of the coalition forces. Conventional contingency accounts of leadership suggest that accurate accounts of the context are a critical element of the decision-making apparatus but such accounts appear incapable of explaining the decis...

The PALFA Survey: Going to great depths to find radio pulsars

The on-going PALFA survey is searching the Galactic plane (|b| < 5◦, 32◦ < l < 77◦ and 168◦ < l < 214◦) for radio pulsars at 1.4 GHz using ALFA, the 7-beam receiver installed at the Arecibo Observatory. By the end of August 2012, the PALFA survey has discovered 100 pulsars, including 17 millisecond pulsars (P < 30 ms). Many of these discoveries are among the pulsars with the largest DM/P ratios...

Environmental problems behind the Great Wall.

China is a rapidly developing country with one-fifth of the world's population. The country faces major social and political problems, which have gained the world's attention. Equally challenging are serious environmental problems resulting from overpopulation, rapid industrialization, and overuse of natural resources that could potentially threaten the health of China's 1.2 billion people, whe...

Optimization Problems in Multicast Tree Construction

Multicasting is a technique for data routing in networks that allows multiple destinations to be addressed simultaneously. The implementation of multicasting requires, however, the solution of difficult combinatorial optimization problems. In this chapter, we discuss combinatorial issues occurring in the implementation of multicast routing, including multicast tree construction, minimization of...

Solving Deepwater Well-Construction Problems