Vibration is a physical phenomenon that harms human health. Practice has shown that strong vibration can cause fractures, bruising of the skin, rupture of organs, movement of internal organs, and concussion. Every part of the human body has its own fixed frequency. For example, the natural frequency of the thoracic-abdominal system is 3-8 Hz. When the vibration frequency coincides with the frequency of the human organs, resonance will occur, which will directly damage the internal organs, and in severe cases, it will lead to death. If people are in a state of long-term vibration, diseases such as the nervous system, cardiovascular system, digestive system, and metabolism will develop. As time passes, it will cause vibration. Vibrosis is one of the 14 occupational diseases announced by the Ministry of Health. The initial manifestations of whole-body vibrations were dizziness, fatigue, weakness in the feet and legs, and muscle pain and neurasthenia. Facial tremors are expressed in finger licks, and some loosen nails, causing insomnia and other neurasthenia. The driver is a direct victim of vibration and vibration is harmful to the driving safety of the driver. Therefore, the driver should pay attention to prevention during driving. (1) Do not overload. The anti-vibration device of the car is designed according to the approved load; if it is overloaded for a long time, its anti-vibration device must be damaged and lose its function. Obviously, overloading is not conducive to safe driving, but also endanger the driver's body. (2) Do not speed. Speeding not only brings harm to the driver's safe driving, but also brings violent vibration at high speeds. When the road surface is uneven, it is necessary to reduce the speed so as to reduce vibration and facilitate safety. (3) Avoid driving the vehicle continuously for a long time. Anti-vibration items can be used to reduce the harm of vibration. The driver should pay attention to a rest when he is rushing for a long time. Can wear anti-vibration shoes, wear anti-vibration gloves, seats softer to reduce vibration.
A greenhouse(also called hothouse)is a building or complex in which allow for greater control over the growing environment of plants. Depending upon the technical specification of a greenhouse, key factors which may be controlled include temperature, levels of light and shade, irrigation, fertilizer application, and atmospheric humidity. Greenhouse may be used to overcome shortcomings in the growing qualities of a piece of land, such as a short growing season or poor light levels, greenhouses are often used for growing flowers, vegetables, fruits, transplants and seedlings. Greenhouses can be divided into glass greenhouses and plastic greenhouses. Plastics mostly used are polyethylene film and multiwall sheets of polycarbonate material, or PMMA acrylic glass. Commercial Glass Greenhouse are often high-tech production facilities for vegetables or flowers. The glass greenhouse are filled with equipment such as screening installations, heating, cooling and lighting, and may be automatically controlled by a computer.