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There is very little reliable information about the forces needed to cause injury to the human body. Namely, it is very difficult to obtain reliable reports about the influence of mechanical forces and the subjective reaction to these forces, mainly due to the complexity and diversity of the human body in both physical and behavioral aspects.The need for the study of physical, physiological and psychological reactions of living beings in a laboratory, under controlled conditions, has led to the development and use of specialized devices for the simulation of impact and vibrations in order to carry out experiments on humans and animals. "Anthropometric" or "anthropomorphic" dummies that simulate the basic static and dynamic properties of the human body are widely used in the study of plane and car crashes. Thus, for example, a Hybrid III dummy is used in case of a frontal crash of the car. Various research works about automotive and aviation accidents as well as experiments with both dummies and living beings show that full support to the body and limiting the movement of the limbs provide maximum protection from the forces of acceleration. [ABSTRACT FROM AUTHOR]

Noise and vibration are among the main negative elements of the working environment. The aim of this study was to determine the measurement of the size of their effect on helicopter pilots and crew members. The results were compared with the warning and limit values determined by the existing Directives of the European Commission in the field of noise and vibration. The comparison of the results has led to the conclusion that the measured values are unacceptable in terms of safety and health at work and that the measured values exceed the limits. The measurements have pointed out to a danger of occupational diseases among crew members and to the necessity to take measures to reduce the harmful effects of noise and vibration on helicopter personnel. [ABSTRACT FROM AUTHOR]

The transmission of the Mössbauer γ-quanta through a vibrating absorber is analyzed in the framework of the quantum theory. For this aim the photons are described by the Bialynicki - Birula's wave function. We calculated time dependence of the wave packets, which describe the transmitted γ-photons. It is shown that the squared modulus of their wave function determines the detection rate of γ-photons in full analogy with particles having a mass. The effect of anomalous transmission of Mössbauer radiation, caused by high-frequency periodic swings of the absorber, and the corresponding suppression of reactions is studied. [ABSTRACT FROM AUTHOR]