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493results about How to "Fast release" patented technology

Method and device for measuring sulfur content in coal by ultraviolet absorption spectroscopy

The invention discloses a method and a device for measuring sulfur content in coal by ultraviolet absorption spectroscopy. In the measurement method, the decomposition scale and a threshold are determined adaptively by combining empirical mode decomposition with 3sigma criterion, and non-stationary characteristics of differential absorption degree per se can be fully retained, so the spectral interference problem caused by dust, water vapor and background gas in combustion gas is effectively solved; the instantaneous concentration of SO2 is obtained through calculation according to the differential absorption degree after noise reduction and trend term removal, and the total sulfur content accumulated in the coal sample combustion gas is calculated through the gas flow; the sulfur content in the coal can be obtained by dividing the coal sample amount by the total sulfur content separated from the coal sample combustion; and the pretreatment process needed to be performed on the combustion gas by coulometric titration and an infrared absorption method is avoided. The device for measuring the sulfur content in the coal by the ultraviolet absorption spectroscopy comprises a combustion furnace, a measuring chamber, an ultraviolet light source, a spectrometer, an air purifying device, a flow meter, a waste gas treatment device, a computer, and the like.
Owner:SOUTHEAST UNIV

Magnetic targeting carrier capable of carrying gene and drug, preparation method and application thereof

The invention discloses a magnetic targeting carrier capable of carrying genes and drugs, a preparation method and an application thereof. The invention is a carrier which has stability, safety and targeting and has controlled release behavior for non-viral magnetic gene therapy and drug therapy. The carrier material of the invention is characterized in that the carrier material is a bunchy silica mesoporous material with magnetism; the length-diameter ratio is not less than 3; the loading capability is big; the material has a protective effect on loaded genes and carriers and superparamagnetism, is not easy to agglomerate, and can control release speed of genes and drugs in vitro; and the surface thereof is easy to modify various functional groups, thus having wide adaptability. The invention also provides a preparation method of the carrier. When in use, therapeutic short chain DNA, siRNA or drugs enter in holes or are combined with surface modified functional genes by a soaking mode, then reach a targeted tissue by guidance of an applied magnetic field, and release the short chain DNA, siRNA or drugs carried thereby under the action of an alternating magnetic field, thus achieving the purpose of magnetic targeting controlled therapy.
Owner:CENT SOUTH UNIV

Fruit cucumber culture medium and preparation method thereof

The invention discloses a fruit cucumber culture medium and a preparation method thereof. The fruit cucumber culture medium comprises substances in parts by weight as follows: 50-70 parts of crop straw, 25-30 parts of peanut hulls, 23-36 parts of soybean meal, 10-18 parts of humic acid, 10-15 parts of algae, 13-20 parts of corncobs, 5-13 parts of distillers' grains, 19-27 parts of plant ash, 15-21 parts of bone meal, 30-46 parts of poultry manure, 16-27 parts of peat soil and 11-17 parts of mushroom residues. The prepared culture medium is a special culture medium for growth of fruit cucumbers. The straw used in the prepared culture medium is rich in nitrogen, phosphorus, potassium, calcium, magnesium, organic matters and the like, the culture medium produced by fermenting natural raw materials is close to media required by growth and development of crops, the culture medium has higher fertilizer efficiency and is easier to absorb than fertilizer purchased in the market, and besides, the fertilizer efficiency release speed is high. The fermentation effect during preparation of the culture medium is good, the content of microorganisms in obtained organic fertilizer is high, and 3-5 hundred millions of CFUs (colony-forming units) exist in each gram of the organic fertilizer.
Owner:LINYI UNIVERSITY

Double-magnetic-response temperature-sensitive microcapsules and preparation method thereof

The invention discloses double-magnetic-response temperature-sensitive microcapsules and a preparation method thereof. A temperature-sensitive polymer is coated on the surface of magnetic nanoparticles and filled into the wall material of the microcapsules; under the action of an alternating magnetic field, the magnetic particles generates heat due to a magnetic lag effect the temperature of the magnetic particles thus rises, and when the temperature T is higher than the lowest critical solution temperature (LCST), the wall material forms lots of pores due to the shrinkage of the temperature-sensitive nanoparticles, the diffusion resistance to the medicine molecules passing through the wall material of the microcapluses is small and the release speed is high; and when the temperature T reaches the LCST, the temperature-sensitive magnetic nanoparticles expand to fully fill the pores in the wall material of the microcapsules, the diffusion resistance to the medicine molecules passing through the wall material of the microcapsules is big, and the release speed is low. Therefore, by regulating the synergetic effect between the temperature-sensitive structure of the temperature-sensitive polymer on the surfaces of the magnetic nanoparticles and the magnetothermal effect of the alternating magnetic field, the controlled release of the embedded medicine is realized. The microcapsulesprepared by the invention have double magnetic response and a temperature-sensitive controlled-release property.
Owner:PUTIAN UNIV

Preparation method and use of degradable polymer nano-microcapsules

The invention relates to a preparation method and a use of degradable polymer nano-microcapsules. The preparation method comprises the following steps of carrying out backflow deposition on an acrylic acid monomer to produce uncross-linked polymer nano-microspheres, carrying out backflow deposition to coat a disulfide bond cross-linked polymer shell layer on the surface of the uncross-linked polymer nano-microsphere by disulfide bond-containing N,N'-bis(acryloyl)cystamine as a cross-linking agent, transferring the prepared core-shell composite microspheres into ethanol or water, and carrying out uncross-linked polymer core etching to obtain the degradable polymer nano-microcapsules having monodispersity. The preparation method can be carried out fast, has simple aftertreatment processes, is free of an etching process adopting strong acid or strong alkali and is safe and efficient. After freeze-drying treatment, the degradable polymer nano-microcapsule can carry doxorubicin as a cancer-resistant drug and the cavity of the degradable polymer nano-microcapsule is further filled with perfluorohexane having ultrasonic response so that the degradable polymer nano-microcapsule is effectively used as an ultrasonic contrast agent and a drug carrier. The ultrasonic contrast agent can be fast decomposed to form very low molecular-weight linear molecules (Mn<5000) in the presence of glutathione or dithiothreitol as a reducing agent.
Owner:FUDAN UNIV
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