My fear is that the hopes that I have for my practice, and the beliefs I have come to hold regarding how I would like to teach will be worn down by the myriad realities and pressures I am likely to experience as a beginning teacher. In many ways I suspect that the teaching tools with which I have been equipped by my pre-service training, based largely on constructivist principles, may ill-prepa...

We extend the analysis of N=2 extremal Black-Hole attractor equations to the case of special geometries based on homogeneous coset spaces. For non-BPS critical points (with non vanishing central charge) the (Bekenstein-Hawking) entropy formula is the same as for symmetric spaces, namely four times the square of the central charge evaluated at the critical point. For non homogeneous geometries t...

Government often dominates developing countries. Sometimes government is the only game in town. Countries suffer when rules of this game are deficient and governments are ineffective or predatory. Because this frequently seems to be the case, public sector institutional reforms have emerged as central to development. These reforms are an essential element of interventions by players like the Wo...

We show that the 5 GHz radio flux of transient ballistic jets in black hole binaries correlates well with the dimensionless black hole spin parameter a∗ estimated via the continuumfitting method. The data suggest that jet power scales either as the square of a∗ or the square of the angular velocity of the horizonΩH . This is the first direct evidence that jets are powered by black hole spin ene...

The use of blasting cost (BC) prediction to achieve optimal fragmentation is necessary in order to control the adverse consequences of blasting such as fly rock, ground vibration, and air blast in open-pit mines. In this research work, BC is predicted through collecting 146 blasting data from six limestone mines in Iran using the artificial neural networks (ANNs), gene expression programming (G...

The sudoku completion problem is a special case of the latin square completion problem andboth problems are known to beNP-complete. However, in the case of a rectangular hole pattern – i.e. each column (or row) is either full or empty of symbols – it is known that the latin square completion problem can be solved in polynomial time. Conversely, we prove in this paper that the same rectangular h...

Cosmological gamma-ray bursts (GRBs) appear as the brightest transient phenomena in the Universe. The nature of their central engine is a missing link in the theory of fireballs to stellar mass progenitors, and may be associated with low mass black holes. In contact with an external magnetic field B, black hole spin produces a gravitational potential on the wave function of charged particles. W...