An Experimental Study on the Properties of Concrete and Fiber-Reinforced Concrete in Rigid Pavements.

The complex effect of the amount of cement, polypropylene fiber (the fiber length was 39 mm, and the diameter was 0.45 mm), and polycarboxylate superplasticizer on concrete properties for rigid pavement was determined using the methods of experiment planning and experimental-statistical modeling. The fluidity of all the mixtures was S1.

Pulse wave sensors with improved noise immunity.

Reviewed in this article are the principle of operation and design features of the pulse wave sensors realizing the method of space-oriented differentiation for the noninvasive arterial pressure meters which can measure pressure during the physical tests of a patient. Disclosed are the test results and procedure for checking the pulse wave sensors using the nonstandard means of measurement.