Direct observation of d-orbital holes and Cu-Cu bonding in Cu2O

Article Abstract:

A new method of quantitative convergent-beam electron diffraction has been linked with X-ray diffraction to map the charge-density distribution in the simple oxide Cu2O. It was shown that ambiguities in previous X-ray investigations of the charge density of Cu2O (cuprite) are attributable to large extinction effects on the strong low-order reflections. It is possible to estimate the population of the outer valence shells from the multipole model coefficients using the characteristic and localized distortion around Cu.

Metal bonding, Charge density waves

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Millennium development holes

Article Abstract:

The Millennium Development Goals (MDGs) on eradication of poverty and killer diseases, which are only political promises committed to by world leaders in 2000, are turning out to be largely unfulfilled. A lack of data is making the tracking of progress difficult, and also the effectiveness of measures taken toward achieving the goals.'

Evaluation, Foreign assistance, Government missions, United Nations. UN Millennium Project

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Black holes and information

Article Abstract:

The black-hole evaporation study has increased the knowledge of the physical nature of quantum gravity. The loss of information due to the black-holes has caused concern to scientists. The information lost can never be recovered, and therefore studies are conducted to understand the physics of black-holes.

Usage, Black holes (Astronomy), Quantum gravity

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