Dead-Time Pseudo-Compensation for Improvement of Accurate Characteristics of a Continuous Control System with Correction According CP a Smith Predictor

This paper describes the use of a cascade compensator constructed according to a Smith scheme in the forward loop of a system being designed for the purpose of analyzing the quality of processes in steady states. This can be effectively used to solve the problem of providing the system with a required reserve of stability by placing a dead-time element outside a closed loop. The dead-time effect manifests only when the transient time increases by the value of dead time with no changes in the overshoot value. It is determined that the velocity Q-factor of the system with a cascade compensator constructed according to a Smith scheme theoretically cannot be larger than the reciprocal of the dead time. This paper also demonstrates the possibility of reducing this negative property of the cascade compensator constructed according to a Smith scheme by dead-time pseudo-compensation with the use of differentiating elements.     

The one-stage replacement of single anterior defects of the dental arches with endosseous implants using light-hardening filling materials

Implantation with one-stage repair of a tooth crown using helioprogram has been conducted in 42 patients with single frontal defects of the teeth. A 2.5-3-year follow-up enables the conclusion on this method's safety, good functional and cosmetic results. Thus, it is worth introduction into wide practice.     

Stability of the motion of a solid particle in a planar rotating flow

The effect of the shape of a rotating flow on the motion of a particle in it is studied. The conditions for and regions of stable motion of a solid particle are found.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 16, No. l, pp. 43–46, January, 1969.     

Calculation of energy losses in the participants of the skiing expedition to the North Pole

During the expedition to the North Pole, the food consumption rates were calculated on a regular basis. The mean daily energy losses of the participants of the expedition, the energy losses during skiing with a rucksack across the drifting ice were estimated and the energy metabolism curve by days was built up. The body weight of the participants averaged 78 +/- 5 kg. This made it possible to perform an overall calculation per whole group. The total energy supply with food was appraised from the total amount of the food consumed during the expedition. The total body weight loss of the participants was 11.5 kg, the energy consumption being 100.000 kkal. The total (for 7 men) energy consumption during skiing without a rucksack was calculated according to the formula: [(2,770 kkal X 28.5 days)]+ +[(2,385 kkal X 35.5 days)]. It was thus found to be equal to 1.145.300 kkal. The total energy consumption during skiing with a rucksack was calculated according to the formula: (7 men X X 449 h) and was found to be equal to 1.883.200 kkal. The total energy consumption during the expedition amounted to 3.237.500 kkal. During the expedition, the daily energy deficiency per man was 1.300-1.500 kkal. This deficiency was compensated for during rest. The maintenance of such an energy supply pattern made it possible to preserve a high level of work fitness.