7results about How to "Controlled release rate" patented technology

The application provides a groove structure and a medical stent. The groove structure comprises a body, a groove and a drug coating. The groove is located on the body. A part of the outer surface of the body forms a shoulder, and the shoulder is located at at least one side of the opening of the groove. A part of the drug coating is accommodated in the groove, and another part of the drug coating covers at least a part of the shoulder. In this way, a part of the drug coating is accommodated in the groove, and another part of the drug coating covers at least a part of the shoulder. An operator can control the contact area of the drug coating with the vascular tissue by adjusting the drug loading of the shoulder and the thickness of the drug coating in the groove, thereby controlling the release rate of the drug coating.

This invention relates to the field of acidification environment remediation technology, and discloses a multi-pH-segment slow-release alkaline buffer material, its preparation method, and its application. The alkaline buffer material comprises a slow-release framework and a pH buffering agent encapsulated therein; wherein the slow-release framework is composed of an organic molecular skeleton and terpene polymers / hydrated minerals; the pH buffering agent comprises alkaline materials and optionally acidic materials, used to provide multi-segment pH buffering capacity in acidified environments. The multi-pH-segment slow-release alkaline buffer material provided by this invention possesses the characteristics of adjustable multi-pH segments, long-lasting slow release, and environmental friendliness, and can precisely stabilize pH according to different acidification scenarios. It is directly applied in solid block form, simplifying construction and maintenance, and achieving efficient, long-lasting, and green passive remediation of acidified environments.

This invention provides a chlorine dioxide slow-release purification device with multiple internal compartments, relating to the field of air conditioning technology. It includes a protective housing and a first and a second partition plate connected within the protective housing. A first slow-release chamber is formed between the first partition plate and the inner wall of the protective housing. A second slow-release chamber is formed between the first and second partition plates. A third slow-release chamber is formed between the second partition plate and the inner wall of the protective housing. A slow-release box is disposed in the second slow-release chamber, and a water vapor mist working box is detachably connected to the top of the slow-release box. This invention solves the problems of unstable release process, short purification cycle, and difficulty in maintaining a reasonable effective concentration range caused by the single-chamber structure in the prior art.

The invention relates to the technical field of improved breeding of animal husbandry, and particularly discloses an improved NK cell culture medium and a preparation method thereof. The improved NK cell culture medium comprises a basic culture medium, a supplement and a composite sustained-release body. All the components are mixed according to a specific proportion, and the requirements of NK cell proliferation and function maintenance are met. Wherein the inner layer of the composite sustained-release body takes trehalose and human recombinant serum albumin as protective agents to wrap the interleukin, and the outer layer of the composite sustained-release body is an acrylate prepolymer photocuring polymer containing a photoinitiator, so that the continuous and stable release of the interleukin is realized. Through component optimization and slow release system design, the NK cell culture efficiency and activity are effectively improved, and the method is suitable for NK cell multiplication culture.

The application discloses a kind of sewage treatment fruit shell nutrient release system and method, belong to water treatment technical field.The system of the application includes initial release pool, deep release pool, chemical release pool and pulverizer, inlet and outlet pipe.The annular groove is surrounded by inner ring wall and outer wall in initial release pool, release frame is placed therein, and plant fruit shell is loaded in release frame;Initial release pool is provided with turnover plate, which drives release frame to roll.Deep release pool is built-in release barrel, and powder fruit shell is loaded in release barrel.Chemical release pool includes treatment box, treatment pool, and treatment pool is divided into inner pool and outer pool.Pulverizer is arranged between initial release pool and deep release pool.COD detector is installed at the outlet of initial release pool, deep release pool and chemical release pool, and outlet water is collected in nutrient pool.Fruit shell nutrient release steps include: operation preparation, release operation, promote release, fruit shell crushing, deep release and treatment release.The application not only can maximize the use of agricultural waste fruit shell nutrition, but also can conveniently control nutrient addition concentration and improve nutrient solution quality.

The application discloses a multi-layer embedding areca alkaloid sustained-release system and a preparation method and application thereof, relates to the technical field of areca alkaloid, and the sustained-release system comprises an areca alkaloid core layer, an antioxidation layer and a protective layer. The areca alkaloid sustained-release core layer is located in the innermost layer, the antioxidation layer is wrapped outside the sustained-release core layer, and the protective layer is wrapped outside the antioxidation layer. The areca alkaloid is wrapped by the sustained-release core layer, the antioxidation layer and the protective layer in sequence, can effectively resist the damage of gastric acid and other environmental conditions to the structure of the areca alkaloid, prevents the oxidation inactivation of the areca alkaloid, realizes the target of targeting the intestinal tract of the active areca alkaloid, and meanwhile, can avoid the contact of the areca alkaloid with other organ tissues, and reduces the side effects of the areca alkaloid.