منابع مشابه
Chiral Symmetry Breaking in an External Field ∗
The effects of an external field on the dynamics of chiral symmetry breaking are studied using quenched, ladder QED as our model gauge field theory. It is found that a uniform external magnetic field enables the chiral symmetry to be spontaneously broken at weak gauge couplings, in contrast with the situation when no external field is present. The broken chiral symmetry is restored at high temp...
متن کاملGroupoids: Unifying Internal and External Symmetry
744 NOTICES OF THE AMS VOLUME 43, NUMBER 7 Introduction Mathematicians tend to think of the notion of symmetry as being virtually synonymous with the theory of groups and their actions, perhaps largely because of the well-known Erlanger program of F. Klein and the related work of S. Lie, which virtually defined geometric structures by their groups of automorphisms. (See, for example, Yaglom’s a...
متن کاملin translation: translators on their work and what it means
کتاب در باب ترجمه، اثر استر آلن و سوزان برنوفسکی منتشر شده در ماه می 2013 توسط نشریه کلمبیا است. نویسندگان در این کتاب به بررسی 18 مترجم با در نظر گرفتن نقش آثاری که این مترجمان ترجمه کرده اند میپردازند. کتاب به دو بخش تقسیم میشود: " مترجم در جهان" و " کار مترجم" این دو بخش مقالات همیشگی ترجمه و موقعیت خاص ادبیات بیگانه در جهان وسیع امروزی را مورد خطاب قرار میدهد. در این کتاب مقالات متعددی از ن...
SO2-ethanol-water (SEW) fractionation of lignocellulosics
Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Mikhail Iakovlev Name of the doctoral dissertation SO2-ethanol-water (SEW) fractionation of lignocellulosics Publisher School of Chemical Technology Unit Department of Forest Products Technology Series Aalto University publication series DOCTORAL DISSERTATIONS 95/2011 Field of research Biorefineries Manuscript submitted 9 May ...
متن کاملFrequency Locking by External Forcing in Systems with Rotational Symmetry
We study locking of the modulation frequency of a relative periodic orbit in a general S-equivariant system of ordinary differential equations under an external forcing of modulated wave type. Our main result describes the shape of the locking region in the three-dimensional space of the forcing parameters: intensity, wave frequency, and modulation frequency. The difference of the wave frequenc...
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ژورنال
عنوان ژورنال: Prosthetics & Orthotics International
سال: 2009
ISSN: 0309-3646
DOI: 10.1080/03093640902777254