With the progress of society, urban development is accompanied by noise pollution. However, what is noise and what are the hazards of noise? Today, the quiet little class of Shimufang will be harmful to everyone's science. What is noise? From a physics point of view: noise is the sound produced by a sounding body when it is making irregular vibrations. From the perspective of environmental protection: all the sounds that hinder people from rest, study and work, and the sounds that interfere with the sounds people want to hear are noise. In general, noise is a type of sound that causes irritability or excessive volume and endangers human health. Noise hazard The impact of noise on human health is generally higher than 50Db(A), which has a detrimental effect on people's daily work and life. Specific hazards are as follows: 1 impact on the auditory system The effect of noise on the auditory organs is a process from physiological migration to pathology, resulting in a certain degree of intensity and contact time for pathological hearing impairment. Long-term exposure to stronger noise causes changes in auditory organ damage that generally progress from temporary hearing threshold displacement to permanent hearing threshold displacement. 2 effects on visual organs Noise can have an adverse effect on the visual organs. In general, the greater the noise intensity, the worse the vision clarity stability. At the same time, the noise will also cause color vision and visual field to be abnormal. The investigation found that the noise reduces the visual field of red, blue and white by 80%. 3 effects on the nervous system Repeated long-term stimulation of noise, beyond physiological tolerance, will cause damage to the central nervous system, causing imbalance of excitation and inhibition of the cortex, leading to abnormalities in conditioned reflexes, cerebral vascular dysfunction, changes in brain potential, resulting in neurasthenia Syndrome. 4 effects on the endocrine system Noise can increase the secretion of adrenocorticotropic hormone, adrenocorticotropic hormone, gonadal hormone, and thyroid stimulating hormone through the hypothalamic-pituitary system, causing a series of biochemical changes. 5 effects on the cardiovascular system The main manifestations are sympathetic excitation, heart rate, pulse speed, stronger noise, and stronger reaction, resulting in a significant increase in cardiac output and a certain increase in systolic blood pressure. It is generally believed that the degree of cardiovascular system change is related to the nature of the noise, the parameters, and the length of the contact time. 6 effects on the digestive system Under the long-term effect of noise, it can cause gastrointestinal dysfunction, which is characterized by loss of appetite, nausea, weight loss, decreased secretion of gastric juice, weakness of gastric peristalsis, and slowing of gastric emptying. 7 psychological effects Under high-frequency noise, most people have symptoms of anxiety and excitement. Some people have found that the higher the noise of the workplace, the more accidents and the lower the productivity, the result is still controversial. 8 impact on young children For young children, the noise hazard is especially noticeable. Infants who are often in a noisy environment are not only hearing impaired, but also intellectual development. It is difficult to repair the sensorineural nerve damage and hair cell damage caused by noise. All kinds of phenomena show that if we are in a noisy environment for a long time, our health will be affected to varying degrees. The allowable range of environmental noise proposed by China is that the noise should not exceed 30 decibels at night (22 o'clock to 6 o'clock the next day) and 40 decibels during the day (6 o'clock to 22 o'clock). If you are also being troubled by all kinds of noise, April 18, Shimufang second generation silent door conference, Inviting you to experience 20-40 decibels of quiet space together. Meet Chongqing Lushan, We will not see it! Stainless Steel Worktable Series Stainless Steel Worktable Series,Stainless Steel Worktable,Stainless Steel Table,Stainless Worktable Jiangmen Xinxing Da Stainless Steel Products Co. LTD , https://www.xxdkitchenware.com
Shi Mufang Silent Small Science