Development of soil moisture (moisture) detection technology

Development source of soil moisture (water) detection technology: Category: Technical Articles Update Time: 2008-9-22 10:56:45 Read 94 times on behalf of soil moisture, soil water content, is one of the important physical properties of soil. In automatic agricultural production, the detection of soil moisture is a technical link for realizing automatic and precise irrigation, and it is also an important work for studying soil properties.

In the method of measuring soil moisture, although the most direct drying method is accurate, it takes time and effort to sample and dry, and is not suitable for timely measurement of soil moisture in automatic control. The method of timely measurement of soil moisture in the field includes conductivity method, heat conduction method (electrothermal method), microwave method, negative pressure gauge method, neutron measurement method, and capacitance method. Various methods have their disadvantages: the negative pressure meter method can only measure the water content of the soil capillary section; the conductivity method is to indirectly obtain the soil moisture value by measuring the soil conductivity, because the soil conductivity is not only related to the soil moisture content. It is also related to the species and concentration of ions in the soil. Therefore, the measurement of water quality influenced by irrigation and fertilization have a greater impact; electrothermal and microwave methods also have certain limitations in terms of operation methods, reproducibility, and flexibility; neutron method Wide measuring range, high precision, but relatively high cost, with a certain risk of nuclear radiation, unsuitable for use in general agriculture; Capacitance method utilizes the high permittivity of water, using the side soil as a dielectric, and the probe (detection The head constitutes a capacitor, which measures the humidity of the soil by measuring the capacitance change of the capacitor. It is also an indirect measurement method. Since the dielectric constant of the soil is not only related to the water content, the measurement accuracy is not high enough.

To sum up, in fact, accurate and timely measurement of soil moisture is not a simple matter. Moreover, in the natural situation, the change of soil moisture is a slow process. Even if the problem of sensing humidity (sensor problem) is solved, in the circuit, this slowly changing, near-DC electric signal is processed with high precision. It is not easy.

The detection technology of soil moisture has extremely important significance in the implementation of automated agriculture, and its products have a very wide range of application prospects. However, there are few domestic applications for this research. More applications or FDR sensor method, simple operation, good repeatability, cheap, suitable for testing all kinds of soil moisture in various regions of the country.

Hyaluronic Acid Eye Drops Sodium Hyaluronate (HA), Pure Hyaluronic Acid could be used in eye surgery, such as Hyaluronic Acid Eye Drops, corneal transplantation, cataract surgery, glaucoma surgery, and surgery to repair retinal detachment.

 

Eye Drop Grade Hyaluronic Acid Powder is an important component of intercellular substance, eye vitreous body, joint fluid and other connective tissue. It acts the important physiologic roles in holding body's moisture, maintaining extracellular space, adjusting osmotic pressure, lubricating and promoting cells to repair in the body. Sodium Hyaluronate can be used as viscoelastic agent inintraocular lens implantation operation, as the filler in the osteoarthritis and rheumatoid arthritis and otherjoint surgery, as a medium widely used in eye drops, it also can be used to prevent postoperative adhesion and facilitate the wound heal. The compounds formed by the reaction of Sodium Hyaluronate with other drugs play a drug release effect role, thus achieve the purpose of drug targeted and time controlled release.

 

With the development of medical technology, Sodium Hyaluronate has been more and more widely used in medical applications. In 1976, Sodium Hyaluronate was first commercialized and used as ophthalmic viscoelastic agents, which is a significant progress in the ophthalmic industry. In 1987, Sodium Hyaluronate for intra-articular injection came in to the market. In 1990s, the large-scale production of Sodium Hyaluronate by fermentation made the cost lower, thus products containing Sodium Hyaluronate such as eye-drops, dermal fillers and other Sodium Hyaluronate preparations started to be used extensively.

 Eye Drops Grade Sodium Hyaluronate

Specification

Test Items

Standard

Appearance

White powder

Hyaluronic  acid

≥95%

Molecular weight

≥2.0 X 106 Da

PH

6.0-7.5 

Loss on drying

≤10%

Protein

≤0.08%

Nitrogen

3.0%-4.0%

Heavy metal

≤10ppm

Bacterial counts

≤80cfu/g

Mold and Yeast

≤10cfu/g

Sterile Test

Complies

Shelf Life

Two Years

Conclusion

The results meet the standard

 

Eye Drop Grade Hyaluronic Acid Powder

Pure Hyaluronic Acid Powder,Hyaluronic Acid Eye Drops,Hyaluronic Eye Drops,Eye Drop Grade Hyaluronic Acid Powder

Qufu Hi-Tech Trading Co., Ltd. , https://www.chinahyaluronic-acid.com

Posted on