Two approaches for describing the Casimir interaction in graphene: Density-density correlation function versus polarization tensor

Two approaches for describing the Casimir interaction in graphene: Density-density correlation function versus polarization tensor

Improved tensor-product expansions for the two-particle density matrix

Gábor Csányi,* Stefan Goedecker, and T. A. Arias Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Département de Recherche Fondamentale sur la Matière Condensée, SP2M/NM, CEA-Grenoble, 38054 Grenoble cedex 9, France Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853 ~Received 20 July 2001; published 20 February 2002!

Correlation between Thyroid Function and Bone Mineral Density in Elderly People

Investigations regarding the relationship between bone mineral density (BMD) and thyroid function tests even in the normal range are limited. Therefore, the present study was conducted to investigate the relationship between BMD with thyroid function tests in elderly people. This study is a part of a prospective study about health status of the elderly people in Amirkola city (AHAP) which is on...

Conventional Quantum Chemical Correlation Energy versus Density - Functional Correlation Energy

We analyze the difference between the correlation energy as defined within the conventional quantum chemistry framework and its namesake in density-functional theory. Both quantities are rigorously defined concepts; one finds that E QC c ≥ E DF T c. We give numerical and analytical arguments suggesting that the numerical difference between the two rigorous quantities is small. Finally, approxim...

the effect of traffic density on the accident externality from driving the case study of tehran

در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...