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تعداد نتایج: 3941918  

1997
R. Holman S. Prem Kumar

We consider theories with a spontaneously broken gauged R-symmetry, which can only occur in supergravity models. These give rise to cosmic R-strings upon which gravitino zero modes can exist. We construct solutions to the Rarita-Schwinger spin-3/2 equation describing the gravitino in the field of these cosmic strings and show that under some conditions these solutions may give rise to gravitino...

2018
Oscar F. Herran Gonzalo A. Patiño Edna M. Gamboa

BACKGROUND This study characterizes the intake of sweetened beverages and establishes whether economic inequalities in their consumption exists. METHODS Ecological study. Mixed methods using food frequency questionnaire and inequality indices. Based on the National Nutrition Survey, Colombia, 2010. The sweetened beverage intake of 17,514 subjects in 33 geodemographic units was estimated with ...

1997
M. Pellegrini

اورانوس تاج‌الدینی, علی سادات‌ موسوی

هدف: دراین مقاله، برخی از مفاهیمی که زمینه ظهور نسل جدید وب را فراهم کرده‌اند و چگونگی تأثیر آن بر کتابخانه‌ها و حرفه کتابداری مورد بحث قرار گرفته و در ادامه به کتابخانه 0/2، به‌عنوان کتابخانه‌ای اجتماعی و مشارکتی، و کتابدار 0/2 پرداخته خواهد شد. روش/رویکرد پژوهش: روش به‌کار رفته در این مقاله، روش کتابخانه‏ای است و اطلاعات آن از مطالعه منابع و جست‌وجوی مقالات در سایت‌ها و پایگاه‏های اطلاعاتی مر...

0

Journal: :Peer community in zoology 2022

Crowd-sourced biodiversity databases provide easy access to data and images for ecological education research. One concern with using publicly sourced databases; however, is the quality of their images, taxonomic descriptions, geographical metadata. The method presented in this paper attempts address a suite pipelines evaluate consistency, how well geo-tagging fits known distributions, image cr...

2014
Nicolas Brunner Nicolas Gisin

The idea that the whole can represent more than the sum of the parts is of fundamental importance in science, as illustrated in complexity theory: the emergent behavior of many complex systems cannot simply be derived from their individual components. In quantum mechanics, this phenomenon appears in a particularly subtle form: certain physical quantities, relevant to the description of quantum ...

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