نتایج جستجو برای: first principles

تعداد نتایج: 1544801  

2016
M. Palummo L. Reining P. Ballone M. PALUMMO

In this paper we outline the major features of the "ab-initio" simulation scheme of Car and Parrinello, focusing on the physical ideas and computational details at the basis of its efficiency and success. We briefly review the main applications of the method. We discuss the limitations of the standard scheme, as welt as recent developments proposed in order to extend the reach of the method. Mo...

2013
Jerry L. Mashaw JERRY L. MASHAW

2015
M. Alatalo

Rights: © 1992 American Physical Society (APS). This is the accepted version of the following article: Alatalo, M. & Puska, M. J. & Nieminen, Risto M. 1992. First-principles study of He in Si. Physical Review B. Volume 46, Issue 19. 12806-12809. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.46.12806, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/Phy...

2002
M. David Merrill

For the past several years the author has been reviewing instructional design theories in an attempt to identify prescriptive principles that are common to the various theories. This paper is a preliminary report of the principles that have been identified by this search. Five first principles are elaborated: (a) Learning is promoted when learners are engaged in solving real-world problems. (b)...

2003
STEVEN MILLER JONATHAN TENNYSON BRIAN T. SUTCLIFFE

Calculations of the linestrengths and transition frequencies of the forbidden pure rotational spectrum of Hz in the vibrationally excited v2 state are presented. These transitions occur in the far-infrared region, and their observation may be complicated by vi u2 difference transitions. Examples of these are also given. Forbidden rovibrational transition frequencies and linestrengths have also ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده برق 1392

در این تحقیق خواص ترموالکتریکی اکسیدروی خالص و اکسیدروی حاوی ناخالصی نقره بررسی شده است. بدنه های سرامیکی استوانه ای شکل به روش های مرسوم پرس خشک شده با دو رژیم متفاوت حرارت-دما سنتز گردید. الکترودهایی از جنس آلومینیم بر روی دو قاعده به روش تبخیر حرارتی نشانده شد. اندازه گیری مقاومت الکتریکی و ضریب سیبک به روش اندازه گیری در جریان صفر در گستره دمایی 90 تا ?310 صورت گرفت. هر دو پارامتر کاهش تدری...

Journal: :Journal of Physics: Conference Series 2009

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