Competitive behavior has often been presented as the ultimate engine of economic, technological, and scientific progress. Since all such progress is likely to imply some measure of social benefit, competition has been widely praised in modern western culture. However, competition can have very negative effects on social wellbeing. An early example is known as the "tragedy of the commons." The c...

Authors of articles published in medical journals are often busy researchers who cannot afford time devoted to writing. Though they are experts in their own therapeutic area, more often than not, researchers find it difficult to actually write and publish their research. Professional medical writers with their expertise in writing clear, concise, comprehensible, and coherent content are often a...

introduction: the number of systematic reviews and meta-analyses published in iran has increased significantly in recent years. writing these articles based on internationally accepted guidelines is one of the most important factors effective on their structural quality. this study aimed to assess the abstract of iranian systematic reviews and meta-analyses indexed in scopus. methods: this stud...

We present a new method to calculate directly the one-particle self-energy of an impurity Anderson model with Wilson's numerical Renormalization Group method by writing this quantity as the ratio of two correlation functions. This way of calculating Σ(z) turns out to be considerably more reliable and accurate than via the impurity Green's function alone. We show results for the self-energy for ...

We present some formulae for the moments of inertia of homogeneous solids of revolution in terms of the functions that generate the solids. The development of these expressions exploits the cylindrical symmetry of these objects, and avoids the explicit use of multiple integration, providing an easy and pedagogical approach. The explicit use of the functions that generate the solid gives the pos...

In " Writing and Writing Patterns," M^5 Marion Richardson has made a very valuab'e contribution to the art of teaching. Apart fro*11 setting forth an excellent method of teaching handwriting, these little books must help ^ child who uses them to develop an appreciatiojj of rhythm and beauty. One hopes they ^ inspire creative effort and that they shall not used merely as copy books. The examples...

Let α ∈ [0, 1] be a real number. Ernie Croot [3] showed that the quantity max A⊆Z/pZ |A|=⌊αp⌋ #(3-term arithmetic progressions in A) p tends to a limit as p → ∞ though primes. Writing c(α) for this limit, we show that c(α) = α/2 provided that α is smaller than some absolute constant. In fact we prove rather more, establishing a structure theorem for sets having the maximal number of 3-term prog...

We determined the quality of medical prescription in Ribat University Hospital, Khartoum through detecting errors in doctors' prescriptions. We randomly selected 1000 medical prescriptions and checked them for completeness and legibility. The total number of doctors responsible for writing the prescriptions was 46. The patient's full name was written on only 18.8% of prescriptions and that of t...

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