Concept

Loi du χ² non centrée

Publications associées (56)

Multiscale modeling of oxygen diffusion through the oxide during silicon oxidation

We investigate at the atomic scale the oxygen diffusion process occurring during silicon oxidation. First, we address the energetics of several oxygen species in the oxide using density-functional calculations. Our results support the interstitial O-2 mole ...

2004

Dielectric response of oxides in the weighted density approximation

Nicola Marzari

Calculations of the static dielectric response epsilon (infinity) of some simple oxide and mixed transition-metal oxide insulators using the weighted density approximation are reported, including in particular the perovskites KNbO3, KTaO3, and BaTiO3. The ...

2000

Shotgun sequencing of the human transcriptome with ORF expressed sequence tags

Philipp Bucher

Theoretical considerations predict that amplification of expressed gene transcripts by reverse transcription-PCR using arbitrarily chosen primers will result in the preferential amplification of the central portion of the transcript. Systematic, high-throu ...

2000

Capacity-achieving sequences

Mohammad Amin Shokrollahi

A capacity-achieving sequence of degree distributions for the erasure channel is, roughly speaking, a sequence of degree distributions such that graphs sampled uniformly at random satisfying those degree constraints lead to codes that perform arbitrarily c ...

2000

Ab initio determination of the dielectric response of GaAs, AlAs, C, and SrO in the weighted-density approximation

Nicola Marzari

We investigate the accuracy of the weighted-density approximation (WDA) in predicting the dielectric response of materials from first-principles. WDA is a genuinely non-local formulation for the exchange-correlation term of density-functional theory. Still ...

2000

Application of Photoelectron Spectromicroscopy to a Systematic Study of Toxic and Natural Elements in Neurons

Giorgio Margaritondo

A systematic photoelectron spectromicroscopy study is presented of the spatial distribution of a toxic element, aluminium, iron or chromium, in neuron cultures, after exposure to a solution of the element. The study was performed by the X-ray secondary-emi ...

1995

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