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1. How to read the prescription for measuring eye degree
1. R represents the right eye, L represents the left eye
2. S represents the sphere degree, used to represent the degree of myopia or hyperopia
3. C represents the cylinder degree, used to represent the degree of astigmatism
4. A represents the axis of astigmatism
5.+represents hyperopia, - represents myopia
6. VD is an abbreviation for examination distance, measured in meters
7. PD stands for Pupillary Distance, which is the distance between the centers of the pupils of both eyes. 8. Your left eye has a myopia of 150 degrees and astigmatism of 25 degrees, with the axis of astigmatism being 151 degrees. 9. Your right eye has myopia of 100 degrees, astigmatism of 25 degrees, and the axis of astigmatism is 7 degrees.2. Apics cltd
3. How should I translate "vortex flowmeter" in English?
Vortex flowmeter: Vortex Flowmeter. Translation of other flowmeters for reference: Electromagnetic flowmeter: Coriolis Mass Flowmeter. Open channel flowmeter: Orifice Plate Flowmeter. Rotary flowmeter: Rotameter. Turbine flowmeter. Calorimetric flowmeter. Volumetric flowmeter: Positive Displacement (PD) flowmeter. Ultrasonic flowmeter: Ultrasonic flowmeter. Venturi flowmeter: Venturi Flowmeter: Thermal Mass Flowmeter Multiphase Flowmeter Flumes and Weirs Flowmeter
4. What are the types of flowmeters
There are 8 types of flow meters, including differential pressure flow meter, volumetric flow meter, turbine flow meter, electromagnetic flow meter, ultrasonic flow meter, vortex flow meter, thermal mass flow meter, and Coriolis mass flow meter.
1、 Differential pressure flowmeter is the most common
2、 A volumetric flowmeter is used to measure the volumetric flow rate of liquids or gases. It introduces the fluid into the measuring space and calculates the number of rotations. Impellers, gears, pistons, or orifice plates are used to divert fluid. PD flowmeter has high accuracy and is one of the methods for measuring viscous liquids. But it can also generate irreparable pressure errors and require the installation of moving parts.
3、 Turbine flowmeter: When fluid flows through a turbine flowmeter, the fluid causes the rotor to rotate, and the rotational speed of the rotor is related to the velocity of the fluid. Derive the flow rate or total amount based on the average fluid velocity sensed by the rotor. Turbine flow meters can accurately measure clean liquids and gases. Like PD flow meters, turbine flow meters can also generate irreparable pressure errors and require moving parts.
4、 Electromagnetic Flowmeters (EMF) are a new type of flow measurement instrument that rapidly developed in the 1950s and 1960s with the advancement of electronic technology. An electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the flow rate of a conductive fluid based on the induced electromotive force when the fluid passes through an external magnetic field.
5、 The propagation
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