Results 41 to 50 of about 930,733 (184)

Low-energy insulating reconstructions of Si(111)-7x7 surface with and without stacking fault discovered by graph theory [PDF]

open access: yesarXiv
The 7x7 reconstruction of Si(111) surface is one of the most fascinating configuration in nature, whose STM image has been well-understood by the famous dimer-adatom-stacking-fault model (DAS). However, the electronic property of the DAS model is always confirmed to be metallic by first-principles calculations, while some experiments detected ...
arxiv  

Topics in Finite Temperature Field Theory [PDF]

open access: yesarXiv, 2000
We discuss a few selected topics in finite temperature field theory.
arxiv  

Robust discriminant analysis [PDF]

open access: yesarXiv
Discriminant analysis (DA) is one of the most popular methods for classification due to its conceptual simplicity, low computational cost, and often solid performance. In its standard form, DA uses the arithmetic mean and sample covariance matrix to estimate the center and scatter of each class. We discuss and illustrate how this makes standard DA very
arxiv  

Comment - Practical Data Protection [PDF]

open access: yesarXiv, 2008
Recently, Rawat and Saxena proposed a method for protecting data using ``Disclaimer Statement''. This paper presents some issues and several flaws in their proposal.
arxiv  

A Witt type formula [PDF]

open access: yesarXiv, 2013
This paper investigates some combinatorial and algebraic properties of a Witt type formula for graphs.
arxiv  

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