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After the appearance of vacuum smoke, it has caused a debate about which of the two methods of warming and humidifying and vacuuming is effective. Watkin et al. conducted a comparative study of the appearance effects of the two methods and conducted a questionnaire survey. They believed that the fingerprint lines displayed by the warming and humidifying display method were very white, usually not uniform, and had spots; and vacuum The fingerprints revealed by the smoked method are mostly transparent or translucent. Therefore, direct observation on the surface of most of the objects is not very good, and further dyeing is required. The observation after the dyeing and the photographing effect are better than the humidification and humidification method. It is better for reflective surfaces or transparent objects. Watkin et al. placed the handprints displayed by the two methods of visualization on a scanning electron microscope and found that the appearance of the handprints was different. The fingerprints revealed by the vacuum smoke method were observed under a scanning electron microscope. The fingerprint lines were A layer of material that is polymerized on the ridges.
We adopted color and mass spectrometry to overcome the shortcomings of non-standard samples, demanding samples, and other shortcomings. We achieved qualitative accuracy, less interference, and achieved satisfactory test results. With the function of separation and detection, due to the huge compound database, the inspection task can still be completed in the absence of standards in the laboratory. Therefore, it has become an indispensable analytical tool in toxicology and drug testing laboratories. It can do inspections quickly and provide prompt clues and evidence for the reconnaissance department. The success of this case testifies to this point.
Vacuum warming shows that the fingerprint is fast and the effect is good. Because the vacuum fuming method does not cause polymerization in the background, it is suitable for various dyeing processes, so that the displayed fingerprints have better quality. Showing the handprint method is the most common technique used by the criminal technical department to visualize the sweat surface of the slick object. At present, public security grassroots business units are equipped with smoked bags, heated humidifiers, but there are no vacuum devices. Compared with the warming and humidifying method, the vacuum fuming method has its own advantages; the displayed fingerprints have clearer features; there is no over-thickness phenomenon; the dyeing process does not appear on the background of the object; the surface is not A particularly smooth object ensures uniform smoking; for objects such as plastic bags, it does not need to be fully expanded to achieve a full smoke effect. In addition, the vacuum smoke display technology does not change the plastic bag, and the heating method will make The plastic bag becomes hard and brittle, and the displayed handprint has strong stability. The use of powder or dyeing does not affect the effect. This method is compared with warming and humidification. The disadvantage is that it is usually impossible to directly observe clear fingerprints after smoked, and further dyeing is required.
A stable pH in an aquarium is extremely important.
Because the pH of the water in the aquarium tank will be reduced by the residue of nitrite and nitrate, it must be detected regularly, so as not to deteriorate the water quality, resulting in fish body discomfort and infection of diseases.
To know, the sea fish common large and small white spot disease, the vast majority is due to the pH change is too large and infected, special attention should be paid to: in the drug treatment should be adjusted during the pH and the correct monitoring of its changes, it will be easier to control the sea fish white spot disease.
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