55results about How to "Control erosion" patented technology

An implantable medical device, such as a stent, with a coating region for controlling erosion of the substrate region is disclosed.

A multiple pulsed dose drug delivery system for pharmaceutically active amphetamine salts, comprising a pharmaceutically active amphetamine salt covered with an immediate-release coating and a pharmaceutically active amphetamine salt covered with an enteric coating wherein the immediate release coating and the enteric coating provide for multiple pulsed dose delivery of the pharmaceutically active amphetamine salt. The product can be composed of either one or a number of beads in a dosage form, including either capsule, tablet, or sachet method for administering the beads.

The invention discloses a method for constructing water fluctuation belt vegetations of the Three Gorges reservoir by the vertical arrangement of arbor-bush-grass, and relates to a method for constructing reservoir water fluctuation belt vegetations. The method comprises the followings steps of: 1, selecting arbor-bush-grass species which are suitable to be grown in the water fluctuation belts of the Three Gorges reservoir as plant materials; 2, selecting abandoned farmlands or areas where the soil layer is thicker and the terrain is gentle in the water fluctuation belts as a planting base; 3, after the water in the reservoir is receded in spring, cleaning residual vegetations, and flattening the lands; 4, at an altitudinal gradient, from bottom to top, planting annual plants, perennial plants, bushes and arbors in sequence; and 5, managing the vegetations according to the common method. In the method, the vegetations are planted on the suitable areas in the water fluctuation belts, so that the soil corrosion is controlled, the landscape is improved, and the ecological benefits of the water fluctuation belts are improved; the large-scaled popularization of the method is convenient; and the method is suitable to be used for not only constructing the vegetations on the water fluctuation belts of the Three Gorges reservoir, but also beautifying the landscape and re-constructing the vegetations in the reservoir water fluctuation belts in regions where all or a part of 12 species are suitable to be grown.

The present invention relates to an oral drug delivery system for poorly soluble drugs, which can provide sustained near zero order release of poorly water soluble drugs from erodible matrix systems. Erodible matrix core is prepared using at least one active and erosion modulators in a matrix of low molecular weight and high molecular weight hydrophilic polymers in combination with a pH sensitive polymer which enable uniform hydration, controlled erosion and pH independent drug release through out GIT. The core optionally contains solubilizers. The core is optionally coated using combination of low molecular weight water soluble and water insoluble polymers, plasticizer and fillers, which provides for drug release, following a lag time, which also helps to reduce food effects in the stomach.

An extended release pharmaceutical compressed composition and dosage form comprising poorly water soluble macrolide antibiotic, surfactant and non-lipophilic, non-polymeric excipient is disclosed. The composition releases the macrolide antibiotic over an extended period of time, generally at least over 12 hours, even in the absence of a release rate-retarding polymer, release rate-retarding coating or release rate-retarding lipophilic excipient. The composition is suitable for once daily or twice daily oral administration for the treatment of many different types of bacterial infections. One embodiment of the compressed composition includes a drug-containing granular composition and a binding composition, wherein the two are mixed together and then compressed into a tablet or pill. The surfactant is in admixture with or coated onto the macrolide antibiotic, and it can be included in the granular composition and/or the binding composition. The non-polymeric, non-lipophilic excipient is included in the granular composition and/or the binding composition.

A drill bit string has an internal steering module for measurement while drilling. A chassis is inserted into a modified drill collar from the axial end, rather than through the side. The chassis has external pockets machined into it from its outer diameter The size of the longitudinally milled slots in the chassis is determined by the size of the components. The mud flow path is positioned off-center because of the component slots. The geometric shape of the flow path through the tool is shaped to optimize the flow area and maintain a wall thickness that can withstand the mud pressure. The wall thickness surrounding the flow area is proportional to the maximum hydrostatic pressure and the circulation pressure.

A method of covering a surface with a matrix-forming polymer includes the step of applying a vinyl acrylic latex polymer to soil such that the polymer bonds particles of the soil to form a substantially continuous latex phase. A method of covering an earthen surface includes: preparing a soil layer; spraying a vinyl acrylic latex polymer on the soil layer such that the polymer bonds particles of the soil in a substantially continuous latex phase; and compacting the sprayed soil. A device for preparing soil for the application of a polymer to form a hardened surface includes rotatable tines and a distribution wand positioned proximate the tines. A mobile delivery system for dispensing a polymeric composition which when applied to soil creates a hardened surface includes containers having a polymer and a migrating agent stored respectively therein and a plurality of other associated trailer-mounted devices.

The invention relates to the technical field of soil remediation and environmental protection and particularly relates to an amendment for heavy-metal contaminated soil. The amendment is prepared through mixing raw materials, i.e., dry carbide slag, a bio-organic fertilizer, polyacrylamide and chitosan, and the pH value of the amendment is 11 to 12. The amendment for the heavy-metal contaminated soil can be used for adjusting the pH value of the soil; the amendment has special enriching, absorbing and degrading capability to heavy metal elements in the soil; the degraded amendment is a high-quality organic fertilizer, can be absorbed by crops and can play an important role in the aspects of controlling soil erosion and preventing loss of soil and water; soil hardening cannot be caused while the soil is amended; and the preparation process for the amendment for the heavy-metal contaminated soil is simple, the main raw materials, i.e., the dry carbide slag and the bio-organic fertilizer are low in cost, heavy metals in the soil are effectively amended, the injury to the crops, human bodies and animals caused by the heavy metals is eliminated, the adsorbing capacity of the soil to nitrogen is improved, and the effectiveness of plant nutrient elements in the soil is improved.

The invention discloses an online control device and an online control method for electrolyte conductivity in electrolytic machining, and belongs to the field of electrolyte conductivity control. The online control device for electrolyte conductivity in electrolytic machining disclosed by the invention comprises a submersible pump, an insulation pipe, an electromagnetic valve, a conductivity sensor, a conductivity controller, a cooling device and a heating device, wherein the submersible pump is communicated with the electromagnetic valve through the insulation pipe; the electromagnetic valve is communicated with the conductivity sensor; the conductivity controller is respectively connected with the submersible pump, the electromagnetic valve, the conductivity sensor, the cooling device and the heating device; the cooling device is used for cooling down electrolyte; the heating device is used for warming up the electrolyte. The invention also discloses the online control method for electrolyte conductivity in the electrolytic machining. According to the online control device and the online control method for the electrolyte conductivity in the electrolytic machining, a gap of electrolytic machining is controlled through online control of the electrolyte conductivity, thus the electrolytic machining precision is improved.

A steerable-thrust Hall effect thruster in which a final stage of a magnetic circuit includes an inner pole and a facing outer pole, the inner pole being offset axially downstream relative to the outer pole, so that a magnetic field is inclined relative to a transverse plane of the thruster.