在以前的一篇文章中提到，arXiv:0706.2968利用随机电阻器网络来分析电导对掺杂和无序的标度依赖，以及磁阻和移相率。发表在这一期Phys.Rev.Lett.上了( Phys.Rev.Lett., 99, 176801).
Archive for October, 2007
逾渗电流
Tuesday, October 30th, 2007关于请假
Tuesday, October 30th, 2007Princess Lin刚刚发到qq群里面的消息，转贴如下：
我向老板请一天假，老板推心置腹地说：”你想请一天假？看看你在向公司要求什么——-一年里有365天你可以工作。 一年52个星期，你已经每星期休息2天，共104天，剩下261天工作。你每天有16小时不在工作，去掉174天，剩下87天。 每天你至少花30分钟时间上网，加起来每年23天，剩下64天。每天午饭时间你花掉1小时，又用掉46天，还有18天。 通常你每年请2天病假，这样你的工作时间只有16天。每年有5个节假日公司休息不上班，你只干11天。 每年公司还慷慨地给你10天假期，算下来你就工作1天，而你TMD还要请这一天假。
A mathematical and computational review of Hartree-Fock SCF methods in Quantum Chemistry
Friday, October 19th, 2007Pablo Echenique, J. L. Alonso give a review of the fundamental topics of Hartree-Fock theory in Quantum Chemistry. From the molecular Hamiltonian, using and discussing the Born-Oppenheimer approximation, we arrive to the Hartree and Hartree-Fock equations for the electronic problem. Special emphasis is placed in the most relevant mathematical aspects of the theoretical derivation of the final equations, as well as in the results regarding the existence and uniqueness of their solutions. All Hartree-Fock versions with different spin restrictions are systematically extracted from the general case, thus providing a unifying framework. Then, the discretization of the one-electron orbitals space is reviewed and the Roothaan-Hall formalism introduced. This leads to a exposition of the basic underlying concepts related to the construction and selection of Gaussian basis sets, focusing in algorithmic efficiency issues. Finally, we close the review with a section in which the most relevant modern developments (specially those related to the design of linear-scaling methods) are commented and linked to the issues discussed. The whole work is intentionally introductory and rather self-contained, so that it may be useful for non experts that aim to use quantum chemical methods in interdisciplinary applications. Moreover, much material that is found scattered in the literature has been put together here to facilitate comprehension and to serve as a handy reference.
It will appeared in Molecular Physics.
Statistical physics of social dynamics
Friday, October 19th, 2007A New Review about social dynamics:
Statistical physics has proven to be a very fruitful framework to describe phenomena outside the realm of traditional physics. The last years have witnessed the attempt by physicists to study collective phenomena emerging from the interactions of individuals as elementary units in social structures. Here we review the state of the art by focusing on three major research lines i.e., opinion, cultural and language dynamics. In addition we discuss other social phenomena, such as crowd behavior, hierarchy formation, human dynamics, social spreading. We highlight the connections between these problems and other, more traditional, topics of statistical physics. We also emphasize the comparison of model results with empirical data from social systems.
It is submitted to Rev.Mod.Phys. .