Chlorophyll is the main photosynthetic pigment of plant leaf photosynthesis and is essential. The determination of chlorophyll content is one of the important items in the laboratory. For example, Arnon method, spectrophotometer method, and chlorophyll content analyzer are used. So far, in practical applications, we usually use Chlorophyll Content Analyzer because it is convenient, fast, accurate and portable. It is favored by a wide range of agricultural workers and scientific research institutes.
The spectrophotometric method is accurate and reliable, but it is necessary to damage the leaves and tissues during the measurement, which is not conducive to systematic research on the plants. The leaf color value reflects the green degree of the plant leaf, and there is a certain correlation with the chlorophyll content. Chlorophyll content analyzer is a kind of instrument specially used for determining the chlorophyll content of plants. The instrument is produced and sold by many manufacturers, among which the Konica Minolta company's SPAD-502 is the most advanced and popular. Top Instruments, as a special agent of Japan Konica Minolta Co., Ltd., also provides sales of chlorophyll content analyzers. The measuring principle of the chlorophyll meter is to measure the absorptivity of the leaves in the red and near-infrared regions. A SPAD value is calculated from the absorptivity of these two regions, which is a numerical representation of the parameters corresponding to the chlorophyll content in the leaves. Because chlorophyll peaks in the blue (400-500 nm) and red (600-700 nm) regions, it does not absorb in the near-infrared region. In addition, the chlorophyll content analyzer also has the effect of reacting nitrogen element content.
There are two methods for measuring corn chlorophyll content. Chlorophyll content assay method: In-vivo determination of the middle leaves of maize functional leaves was performed at the flowering stage using a SPAD-502 chlorophyll content analyzer manufactured in Japan. Take 3 leaves per material and finally average. Spectrophotometer method: The leaves that have been measured by the chlorophyll content meter method are retrieved and measured by a spectrophotometer method. Use a brush to remove impurities from the surface. Rinse with water and wipe dry. Each leaf was punched in the middle with a 9 mm diameter punch, and 6 round leaves were taken, weighed, placed in a 15 mL test tube, soaked in 10 mL of 95% ethanol for 96 h, and mixed twice a day during the soaking. After the leaves were completely whitened and colorimetrically measured, the optical density was measured at the wavelengths of 665, 649, and 470 nm, and the chlorophyll content was calculated. The average of the three leaves was taken as the content of the material. The calculation formula is: CA=13.95D665-6.88D649; CB=24.96D649-7.32D665; C others=(1000D470-2.05CA-114.8CB)/245.
Tungsten carbide welding rope is a type of welding filler material that is used for hardfacing applications. It is made by combining tungsten carbide particles with a binding material, such as nickel or cobalt, to create a rope-like form.
Tungsten carbide is known for its exceptional hardness and wear resistance, making it ideal for applications where the welded surface needs to withstand extreme abrasion and impact. The welding rope is typically used in industries such as mining, oil and gas, construction, and agriculture.
When the tungsten carbide welding rope is heated during the welding process, the binding material melts and fuses the tungsten carbide particles to the base metal, creating a hard and durable surface. This helps to extend the lifespan of equipment and machinery by protecting it from wear and tear.
Tungsten carbide welding rope can be applied using various welding processes, including manual metal arc welding (MMA), gas tungsten arc welding (GTAW), and flux-cored arc welding (FCAW). The choice of welding process depends on the specific application and the equipment available.
Overall, tungsten carbide welding rope offers a cost-effective solution for protecting and repairing high-wear surfaces, making it a popular choice in industries where durability and longevity are essential.
Welding Rope,Ctc Sctc Welding Rope,Cast Tungsten Carbide Welding Rope,Spherical Tungsten Carbide Welding Rope
Luoyang Golden Egret Geotools Co., Ltd , https://www.hvafspray.com