In order to achieve the purpose of energy saving, high efficiency, how to select the pump? There are many types of agricultural pumps and different specifications, not just buy a pump can be used to install, but according to the flow of farmland and head requirements to choose pumps. For a water pump used for irrigation, the design flow rate should be determined based on the amount of water required for growing crops in the irrigation area. When there is no rain and drought, the amount of field water in the peak period of water during the growing season is the basis. If the pump can meet the water requirements during this period, irrigation water for other fertility periods can be guaranteed. The water pump used for drainage is related to the heavy rainfall in the flood season, river network capacity and management level. In order to ensure the protection of crops in case of flooding, the drainage flow shall be determined from the most unfavorable conditions, selecting the period when the crops have the lowest flooding capacity and the most lyrical situation will occur. Regarding the design of the lift, we must first meet the actual elevation of the terrain, that is, the vertical height of the surface of the source water to the surface of the water discharge tank (or the head of the channel), which is obtained by field measurement. However, if this data is used to select the pump, after the installation, the pump cannot pump water. This is because there is frictional resistance in the water flow in the pipeline and some of the pump head is consumed. Therefore, if the selected pump can meet the requirements of the actual terrain elevation and the pipeline loss head, the pump can work normally. The sum of the two is used as the basis for pump selection. The value of head value of pipeline loss is related to the length of pipeline layout. Accurate hydraulic calculation should be carried out. For middle and small-scale irrigation districts, when the primary pump type is selected, the pipeline loss head can use the estimation method, that is, the pipeline loss head equals to the actual topographic lifting water. The height of (0.1-0.2) times. The determination of the design flow and head is the main parameter of the pump selection, and the selected pump can meet the production needs.
1.Good safety of gelatin-free.The first lyophilized Varicella Vaccine, containing no gelatin from animals, invented and produced in China. Getting rid of gelatin from varicella vaccine can significantly decrease the ratio of anaphylaxis incidence .
2.Long validity period by good stability. The first approved varicella vaccine with 36 months of validity period in the world. Adopting BH-2 stabilizer with own IP rights (Chinese patent granted No.: ZL200910138411.6, International patent application No.: PCT/CN2009/001405) greatly enhances the stability of the product and ensures the validity period for 36 months under the storage condition.
3.Better protection with high titer and immune efficacy. It`s documented that compared with the varicella vaccine of low titer, high titer vaccine can reduce breakthrough cases by nearly 75% in vaccination. Of all released batches of Varicella Vaccine from BCHT, the titers are not less than 10000 PFU/dose tested by National Institutes for Food and Drug Control.
Varicella Vaccine(Live)
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icacy. It`s documented that compared with the varicella vaccine of low titer, high titer vaccine can reduce breakthrough cases by nearly 75% in vaccination. Of all released batches of Varicella Vaccine from BCHT, the titers are not less than 10000 PFU/dose tested by National Institutes for Food and Drug Control.