The essence of a "light" diet is to emphasize the use of less oil, and it is by no means non-stick. On the one hand, summer temperatures are high, the body's metabolic rate is accelerated, and the consumption of proteins and calories is increased. On the other hand, the hot weather affects people's appetite, and the body's gastrointestinal vitality also deteriorates, thus reducing food intake. Therefore, if you simply eat vegetables and fruits in the summer, and improperly add protein and high-calorie foods, it will easily lead to physical decline. In general, it is appropriate to eat fish or meat once a day. You may choose to eat it at lunch, preferably no more than 60 grams. Appropriate consumption of high protein foods such as fish and meat will help the body replenish nutrition and improve body resistance. Some people suffer from fatigue, lack of sleep, bad spirits, and vulnerability to illness in the summer. Colds and coughs are common when the air turns cold in autumn. To a large extent, they are related to the reduction of immunity due to insufficient protein intake in summer. In summer, the daily intake of protein is preferably 70-90 grams, and more than half of the best is fish, shrimp, lean meat, chicken, duck, egg, milk and soy products that are easily digested and absorbed by the body. protein. In addition, people in the summer, fatigue, dizziness, headache, loss of appetite and other discomfort may also be related to potassium deficiency. Therefore, you can eat more fresh fruits and vegetables such as scallions, celery, edamame, strawberries, apricots, litchi, peaches, and plums that are rich in potassium. Summer cooking should also pay attention to steaming and boiling, reducing frying and frying, and less salt, so as to reduce the chance of inducing cardiovascular and cerebrovascular diseases. Ultrasonic waves propagate in the liquid, causing the liquid and the cleaning tank to vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequency. This vibration frequency is the sound wave frequency, so people hear the buzzing sound. With the continuous development of the cleaning industry, more and more industries and enterprises have used ultrasonic cleaning machines.
The advantages of the ultrasonic cleaning machine are: the ultrasonic cleaning effect is good, and the operation is simple. The sound that people hear is a sound wave signal with a frequency of 20-20000 Hz. The sound wave above 20000 Hz is called an ultrasonic wave. The transmission of the sound wave propagates longitudinally according to a sinusoidal curve, producing a large number of small bubbles. One reason is that partial tensile stress occurs in the liquid to form negative pressure. The decrease in pressure makes the gas originally dissolved in the liquid supersaturate and escape from the liquid and become small bubbles; the other reason is that the strong tensile stress tears the liquid apart. "A void is called cavitation.
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For the principle of ultrasonic cleaning machine, the high-frequency oscillation signal sent by the ultrasonic generator is converted into high-frequency mechanical oscillation by the transducer and propagated to the medium-the cleaning solvent. The ultrasonic wave radiates forward in the dense and dense phases in the cleaning liquid. The flow of liquid produces tens of thousands of tiny bubbles with a diameter of 50-500μm, and the tiny bubbles existing in the liquid vibrate under the action of the sound field. These bubbles form and grow in the negative pressure zone where the ultrasonic wave propagates longitudinally. In the positive pressure zone, when the sound pressure reaches a certain value, the bubbles increase rapidly and then suddenly close. And when the bubble is closed, a shock wave is generated, and thousands of atmospheres are generated around it, destroying insoluble dirt and dispersing them in the cleaning liquid. When the group particles are wrapped in oil and adhere to the surface of the cleaning part, the oil is emulsified and solid Particles and detachment, so as to achieve the purpose of cleaning parts purification. In this process known as the "cavitation" effect, the closed bubble can form a high temperature of several hundred degrees and an instantaneous high pressure of more than 1,000 atmospheres.
