Calcium propionate This product is a white crystalline powder with no odor or slight special odor. It is soluble in water (1 g is soluble in 3 ml of water), slightly soluble in methanol and ethanol, and insoluble in benzene and acetone. The pH of the 10% aqueous solution is equal to 7.4. Calcium propionate has an inhibitory effect on mold and has no inhibitory effect on yeast. It is an acid anti-mold agent, which is effective in the acidic range. When the pH value is below 5, the inhibition effect on mold is better. When the pH value is 6, the antibacterial ability is significantly reduced. The general addition amount is 0.25% to 0.4%.
According to the test, the anti-mildew effect of sodium diacetate is obviously better than that of propionate products. At present, traditional anti-fungal agents generally have poor palatability, while sodium diacetate tastes sweet and sour, can mask the unpleasant smell of various synthetic drugs and various additives in the feed, has good taste, can enhance animal appetite and increase feed intake. Sodium diacetate is added to the feed to significantly increase its nutritional value. Sodium diacetate is a weak acid salt, and the pH of the 10% aqueous solution is 5.5-6.5, which can promote the activity of various enzymes in the biological intestinal tract and improve the digestion and absorption rate of the animal. It can be used as a buffering agent to regulate the pH value in the intestine of animals, infiltrate and destroy the fungal cell wall, kill and inhibit harmful fungi in the intestinal tract of animals, thereby playing a role in disease resistance and disease prevention.
Dimethyl fumarate This product is white flake or powder crystal, slightly spicy, slightly soluble in water, soluble in ethanol. It is a new type of antiseptic and antifungal agent, with high antivirus, broad spectrum antibacterial and safe. Good chemical stability and long duration of action. The amount added in the feed is about 0.05%.
Sorbic acid (potassium) Sorbic acid (potassium) can effectively inhibit the activity of mold, yeast and aerobic bacteria, and also prevent the growth and reproduction of harmful microorganisms such as botulinum, staphylococcus and salmonella, but anaerobic spores. The beneficial microorganisms such as bacteria and Lactobacillus acidophilus are almost ineffective. Sorbic acid (potassium) is an acidic preservative and still has a good preservative effect in a near neutral (pH 6 to 6.5) environment. It can be directly added, sprayed, dipped, and sprayed dry during use.
It is mainly made of a material with high pyroelectric coefficient, such as lead zirconate titanate ceramics, lithium tantalate, triglyceride titanium sulfate, etc. to make the detection element with a size of 2*1mm. Install one or two detection elements in each detector, and connect the two detection elements in series with reverse polarity to suppress the interference caused by the rise of their own temperature. The detection element converts the detected and received infrared radiation into a weak voltage signal, which is amplified by the field effect tube installed in the probe and output outward. In order to improve the detection sensitivity of the detector and increase the detection distance, a Fresnel lens is generally installed in front of the detector. The lens is made of transparent plastic. The upper and lower parts of the lens are divided into several equal parts. It is a kind of lens with a special optical system. It can amplify the signal by more than 70 decibels in cooperation with the amplifying circuit, so that the movement of people within 20 meters can be measured.
The Fresnel lens uses the special optical principle of the lens to produce an alternating "blind zone" and "high-sensitivity zone" in front of the detector to improve its detection and reception sensitivity. When someone walks in front of the lens, the infrared rays emitted by the human body will alternate from the "blind area" to the "high sensitive area", so that the received infrared signal is input in the form of sudden strong and weak pulses, thereby strengthening its energy amplitude .
The central wavelength of infrared radiation radiated by the human body is 9~10--um, and the wavelength sensitivity of the detection element is almost stable in the range of 0.2~20--um. A window equipped with a filter lens is opened at the top of the sensor. The wavelength range of light that this filter can pass is 7~10--um, which is suitable for the detection of human infrared radiation, and other wavelengths of infrared rays are filtered. The sheet is absorbed, thus forming an infrared sensor specially used to detect human body radiation.
PassiveInfrared Ray,Pyroelectric sensor,Highly sensitive sensor
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