Inequalities which bound the closed-loop eigenvalues in an LQ-optimal system are presented. It is shown that the eigenvalues are bounded by two half circles with radii r1 and r2 and center at 0, where = 0 is the imaginary axis, and that the imaginary parts of these eigenvalues are bounded from up and below by two lines parallel to the real axis.

It is challenging to try to extract physics features from the 10-page long formula of the three loops space-like anomalous dimensions1. That these coefficients could reveal general features of QCD can be illustrated by the example of coherence of QCD radiation. Consider the formula for the small-N limit of the time-like anomalous dimension which, in double logarithmic approximation (DLA), is gi...

For a language learner, any new word is a pseudoword. A pseudoword is a string of of letters or phonemes that sounds like an existing word in a language, though it has no meaning in the lexicon. On the other hand, speakers are well aware of permissible phonemes, their frequencies and collocations in their language due to the phonotactics inherent in the language. For example, saktal is a pseudo...

letter to the editor

letter to the editor

letter to the editor

letter to the editor

letter to the editor

We describe a letter-by-letter patient who produced misreading errors in both letters in isolation and in words. All errors were visual in nature. We hypothesized an access deficit to the abstract visual representation of letters that prevents letter identification. This deficit could account for the patient's letter-by-letter behavior, since each letter constituted a potential identification p...

purpose: e is a commonly use letter for illiterates or those who could not read english to measure visual acuity. the e chart is the mainly used charts in iran. however, they do not have the standards. they are in different format, fixed for 6 meter test, with or without lighting, with unequal number of letters in each line and different contrasts. as a result, there is an essential need for a ...