The paper states results of experimental exposition of concrete test specimens to direct flame. Concrete test specimens made from various mixtures differing in the type of aggregate, binder, dispersed reinforcement, and technological procedure were subjected to thermal load. Physicomechanical and other properties of all test specimens were tested before exposition to open flame: density, compre...

These are the lectures notes from a minicourse given at the Masterclass on “Ergodic theory and von Neumann algebras” at the University of Copenhagen in October 2013. In the Lectures 2, 3 and 4, we will follow S. Vaes’s exposition for his mini-course at the “ Intensive Month on Operator Algebra and Harmonic Analysis” at ICMAT in Madrid in May 2013. The exposition in itself is very close to the o...

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The celebrated Green-Tao theorem states that the prime numbers contain arbitrarily long arithmetic progressions. We give an exposition of the proof, incorporating several simplifications that have been discovered since the original paper.

Ten percent of all strokes are due to spontaneous cerebral hemorrhages. They are associated to drugs (licit and illicit) in 9.5% of all cases in young adults. This is a case report of a 44-year-old man, without previous morbidities, who presented a sudden onset headache and arterial hypertension 24 hours after use of naphazoline as nasal decongestant. Cranial tomography showed right thalamus he...

We briefly discuss here the Balog-Szemerédi theorem, compare its different versions and prove, following Gowers, the strongest one — also due to Gowers. 1. Discussion For a finite set A of elements of an abelian group and a group element s, by νA(s) we denote the number of representations of s as a sum of two elements of A: νA(s) = #{(a′, a′′) ∈ A× A : s = a′ + a′′}. We write 2A = {a′ + a′′ : a...

Correct reaction probability and minimum exposition time in visual form discrimination task were studied under the conditions of varying pattern parameters. The minimal exposition time depended on pattern contrast and pattern background ratio and on the number of screen position variations. However, it remained unchanged when the background luminance and pattern size varied within the suprathre...