Determination of Different Leaf Positions of Apricot with Photosynthesis Instrument

The effect of de-fruiting on photosynthetic rate of leaves at different positions was studied by photosynthesis instrument. It was found that the effect of de-fruiting treatment on the leaves near the leaves was greater than that of the leaf leaves far away from the fruit, and after fruit removal, from the foundation to the new The photosynthetic rates of different leaves in the tip of the shoot are no longer a parabola change, but the trend of gradual increase indicates that the existence of the library has a great influence on photosynthesis of leaves at different positions.

The photosynthetic apparatus used to measure the change of photosynthetic rate of single leaves of fruit trees showed a "low-high-low" pattern. When the leaves were first developed, Pn was very low. With the growth of leaves, Pn increased. When the leaves were fully mature, the photosynthetic rate was the highest. After maintaining for a period of time, Pn gradually decreased with the aging of the leaves. At different parts of the shoot, the environmental conditions and physiological basis for leaf formation were different, and photosynthetic intensity also varied.

Under normal circumstances, the photosynthetic rate of the leaves of different shoots from the base to the top showed a parabolic change. The middle leaves were the highest and the leaves at both ends were gradually lower. At the end of the first rapid growth of the medium-to-long shoot, the photosynthetic rate of the 7th to 14th leaves of the middle part was the highest. The analysis of the photosynthesis instrument indicated that it was at the peak of physiological maturity, and the leaf photosynthetic rate below the 7th leaf was extended with the leaf opening time. The decline is the result of leaf aging.

Using the photosynthesis instrument to determine the different leaf ages, leaf positions, and sound field conditions, the results are not the same for all kinds of leaves. This also shows that the factors affecting photosynthesis of plants are diverse, in which the influence of light is the main Factors, illumination is one of the important factors of apricot productivity, different species and species, light compensation point and saturation point, light-pn curve are very different, even the same species, at different ages, different seasonal photosynthesis instrument The results of the measurements are different.

Ferrite Magnet

Sintered Ferrite Magnet, hard ferrite, hard ferrite magnet is also called Ceramic Magnets.
Sintered ferrite magnets are available in isotropic magnet and anisotropic magnets. The magnetic properties of isotropic ferrite are low. Since they have nearly the same magnetic properties in all directions, so isotropic ferrite magnets can be magnetized in many different directions or in multi-poles. Anisotropic ferrite magnets have better magnetic properties compare with isotropic ferrite magnets. However this type of magnets can only be magnetized along a preferred direction.

Permanent ferrite magnets are made of hard ferrites, which have a high coercivity and high remanence after magnetization. Iron oxide and barium or strontium carbonate are used in manufacturing of hard ferrite magnets. The high coercivity means the materials are very resistant to becoming demagnetized, an essential characteristic for a permanent magnet. They also have high magnetic permeability. These so-called ceramic magnets are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30 to 160 kiloampere turns per meter (400 to 2000 oersteds). The density of ferrite magnets is about 5 g/cm3.

The most common hard ferrites are:
Strontium ferrite, SrFe12O19 (SrO·6Fe2O3), used in small electric motors, micro-wave devices, recording media, magneto-optic media, telecommunication and electronic industry.
Barium ferrite, BaFe12O19 (BaO·6Fe2O3), a common material for permanent magnet applications. Barium ferrites are robust ceramics that are generally stable to moisture and corrosion-resistant. They are used in e.g. loudspeaker magnets and as a medium for magnetic recording, e.g. on magnetic stripe cards.

Why choose Ferrite Magnet?
1. Low cost and low price.
The raw material cost is very cheap and manufacturing process is simple. So the price if it is very low.
2. Nice temperature stability
Ferrite magnets can be used in the working temperature from -40℃ to 200℃.
3. Well prevent corrosion
The raw material of sintered ferrite magnet is oxide, so ferrite magnets will not be rusted under severe environment nor affected by many chemicals.

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