منابع مشابه
Causes of Spelling Weaknesses in Students with Visual Impairment and Teaching Strategies for Spelling Improvement
Background: Spelling is characterized as a basic skill for the children’s writing literacy. A wide range of factors may contribute to the formation and/ or intensification of problems related to teaching writing competencies, so that spellings come with a serious challenge called “invented spelling”. It is also a major concern for teachers and parents of children with visual impairments. Theref...
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The known extrasolar planets exhibit many interesting and surprising features—extremely shortperiod orbits, high-eccentricity orbits, mean-motion and secular resonances, etc.—and have dramatically expanded our appreciation of the diversity of possible planetary systems. In this review we summarize the orbital properties of extrasolar planets. One of the most remarkable features of extrasolar pl...
متن کاملSpurious Eccentricities of Distorted Binary Components
I discuss the effect of physical distortion on the velocities of close binary components and how we may use the resulting distortion of velocity curves to constrain some properties of binary systems, such as inclination and mass ratio. Precise new velocities for 5 Cet convincingly detect these distortions with their theoretically predicted phase dependence. We can even use such distortions of v...
متن کاملSome Eccentricities of Indian Ophthalmic Practice.
AFTER many years of practice in India, I had become so accustomed to the nature of my surroundings that their strangeness did not strike me, and I had learnt to accept things as I found them in my daily life. When, however, during my later years, I had the privilege of receiving distinguished visitors from, many parts of the world, my attention was arrested by the extraordinary interest they to...
متن کاملMean eccentricities of de Bruijn networks
Given a graph G = (V; E) we deene e(X), the mean eccentricity of a vertex X, as the average distance from X to all the other vertices of the graph. The computation of this parameter appears to be nontrivial in the case of the de Bruijn networks. In this paper we consider upper and lower bounds for e(X). For the directed de Bruijn network, we provide tight bounds as well as the extremal vertices...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1917
ISSN: 0036-8733
DOI: 10.1038/scientificamerican11031917-280bsupp