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physics.ed-ph2004
Surveying the solar system by measuring angles and times: from the solar density to the gravitational constant
K. Capelle
A surprisingly large amount of information on our solar system can be gained from simple measurements of the apparent angular diameters of the sun and the moon. This information in…
cond-mat.str-el2004
Impurity and boundary effects in one and two-dimensional inhomogeneous Heisenberg antiferromagnets
P. E. G. Assis, Valter L. Libero, K. Capelle
We calculate the ground-state energy of one and two-dimensional spatially inhomogeneous antiferromagnetic Heisenberg models for spins 1/2, 1, 3/2 and 2. Our calculations become pos…