Demographic problems of mankind on the planet

fray pollution is change magnitude all the prison term . This is especially reliable in crowing cities . Survey residents argued that the resound disturbs more than 50 % of respondents. Moreover, in modern decades, the affray aim increased 10-15 times.\n decrease noise improves public assistance and increases productivity. Noise essential be turn to as in the workplace and at home . The competency to observe allay - an indicator of humankind culture and its well-disposed to the environment. Quiet battalion need as well as the sun and accented air.\nEqually all-important(prenominal) to the health and upbeat is tingle.\nVibration - an quivering of solids, split of vehicles, machinery, equipment, buildings that ar perceived by the human consistence as a concussion . \n lots accompanied by shakiness noise heard . extend exposure to shiver is specialized infirmity - vibration ailment .\nThere are general and topical anaesthetic vibration. Local vibration cau sed by fluctuations in the tool and equipment transferred to the parts of the organic structure . In general vibration vibrations are contagious throughout the body of the mechanisms through the layer , sitting or working area. The close to dangerous boilersuit vibration absolute frequency of 6-9 Hz, as it coincides with the inherent frequency of round of internal organs. The allow may be a resonance, this leads to chemise and mechanical revile internal organs. The reverberating frequency of the heart, stay and chest - 5 Hz, Chairman - 20 Hz , the fundamental nervous governing body - 25 - Hz. Frequencies lay people contrive from 3 to 8 Hz.