75% of newly discovered infectious diseases come from animals
(Reporter Li Daqing) “In the known infectious diseases, 60% of them are caused by humans and animals. Among the newly discovered human infectious diseases, 75% are derived from animals.†“China’s current domestication The number of dogs is about 150 million, and the number of pet dogs is about 40 to 50 million. There are 950,000 registered dogs in Beijing, and the actual number is 100 to 1.1 million. The domestic cats' breeding capacity is 5000 to 6000. Between ten thousand and ninety-five pet cats are between 800 and 9 million.†The two figures were known by the reporter at the “Forum on Pets and Human Health†held recently.
The forum passed the declaration. The declaration pointed out that nutrition, health, and ecological and environmental health are interdependent, mutual cause and effect, and interactions are becoming more and more close. We must establish a new concept of modern health that integrates nutrition, health, animal health, and environmental health. The Manifesto calls for: Caring for animals and treating animals; Establishing a sound pet industry development policy and management system; Consciously handling pet waste and pet excrement disposal; Paying attention to the pet industry scientific and technological work, strengthening the relationship between pets and human health, and pet breeding, breeding, Scientific researches such as support, food, and medical care reduce the impact of pet diseases on human health; give full play to the role of private institutions such as pet associations and pet schools, and popularize scientific knowledge of pets.
Thrust ball bearings are separable bearings, and the shaft and housing rings can be separated from the components of cages and steel balls. The shaft ring is a ring that matches the shaft, and the housing ring is a ring that matches the bearing housing bore, and there is a gap between the shaft and the shaft; Thrust ball bearings can only bear axial loads, unidirectional thrust ball bearings can only bear axial loads in one direction, and two-way thrust ball bearings can bear axial loads in two directions; Thrust ball bearings can not limit the radial displacement of the shaft, the limit speed is very low, unidirectional thrust ball bearings can limit the axial displacement of the shaft and housing in one direction, and two-way bearings can limit the axial displacement in both directions. Thrust roller bearings are used to carry combined axial and radial loads dominated by axial loads, but the radial loads shall not exceed 55% of the axial loads. Compared with other thrust roller bearings, this type of bearing has a lower friction factor, higher rotational speed and self-aligning performance. The rollers of the 29000 type bearing are asymmetrical spherical rollers, which can reduce the relative sliding of the rollers and raceways in the work, and the rollers are long, the diameter is large, the number of rollers is large, the load capacity is high, and oil lubrication is usually used, and grease lubrication can be used for individual low-speed situations. In the design and selection, it should be preferred; The Type 80000 Thrust Cylindrical Roller Bearings, Type 90000 Thrust Tapered Roller Bearings and Type AXK Thrust Needle Roller Bearings, which can withstand unidirectional axial loads, have a much greater axial load capacity than thrust ball bearings, and are rigid and take up less axial space. Thrust cylindrical roller bearings and thrust needle roller bearings are suitable for applications with low speeds, and thrust tapered roller bearings rotate slightly faster than thrust cylindrical roller bearings. [1]
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