39results about How to "The method works well" patented technology

The invention discloses a preparation method of cherokee rose polysaccharide derivatives with an antitumor activity. The preparation method comprises the following steps: firstly smashing cherokee rose fruit, degreasing, removing oligosaccharide, lixiviating with hot water twice, then mixing extracts, filtrating, concentrating, precipitating and drying so as to obtain crude cherokee rose polysaccharide; adding diethylin ethyl amino ethyl (DEAE)-cellulose 52 to carry out static absorption for 30 minutes; washing with distilled water, filtering, and collecting filtrate so as to obtain the decolored crude cherokee rose polysaccharide; carrying out protein removal on a crude polysaccharide solution by using an enzyme method and a Sevag method; further separating the crude cherokee rose polysaccharide with the DEAE-cellulose 52, collecting, dialyzing, and freeze-drying so as to obtain cherokee rose polysaccharide; and finally, carrying out sulphating, carboxymethylation and hydrochloric acid degradation on the cherokee rose polysaccharide, and carrying out carboxymethylation on degradation products so as to obtain a plurality of cherokee rose polysaccharide derivatives. The plurality of cherokee rose polysaccharide derivatives have in vitro antitumor characteristics, and can be used for inhibiting the growth of three tumor cells, namely, ovarian cancer cells, liver cancer cells andrectal cancer cells.

The invention discloses a MIMO radar DOA estimation method based on low-altitude multipath conditions, and belongs to the technical field of array signal processing. The present invention first considers the influence of reflected signals, and introduces a four-path echo signal model. Then use two-way space smoothing algorithm to smooth the received signal to reduce the influence of multipath signal. Finally, the generalized MUSIC algorithm in the real number domain and the joint estimation algorithm of multipath attenuation coefficient and generalized MUSIC are theoretically analyzed, and then the two spectral peak search forms are analyzed. Reduces the influence of spurious spectral peaks, thereby improving estimation performance at low altitudes. On this basis, this paper uses a more reasonable weighting method to improve the original peak search form. Experiments show that the proposed method has a higher estimated success probability and better performance than the existing methods.

The invention provides a hydrogen storage alloy type hydrogenation catalyst and a preparation method thereof. The hydrogen storage alloy type hydrogenation catalyst product is MlNi<3.7>Co<0.6>Mn<0.3>Al<0.4> (M is mixed rare earth). The method comprises the processes of prefabrication and activation of the hydrogen storage alloy type hydrogenation catalyst, wherein the prefabrication process is to smelt alloy raw materials for designing the counterweight of compositions under the protection of argon gas atmosphere, and to perform heat treatment, quenching and milling on the alloy raw materials; and the activation process is to add an alkaline solution of potassium borohydride or sodium borohydride into prefabricated hydrogen storage alloy type hydrogenation catalyst powder, to heat the mixture to obtain a treatment liquid, to add solid potassium borohydride or solid sodium borohydride into the treatment liquid, and to perform temperature rise, filtration and drying to obtain the activated hydrogen storage alloy type hydrogenation catalyst product. The yield of a reaction product obtained from the hydrogen storage alloy type hydrogenation catalyst during hydrogenation reaction at a temperature of 200 DEG C is improved from 2.6 percent to 65.6 percent.

The invention relates to an electromagnetic wave field intensity prediction technology. The calculation complexity is improved while the field intensity prediction accuracy of a ray tracing model is kept, so that the efficiency is improved. According to the adopted technical scheme, a ray tracing model-based method for predicting field intensity by a data interpolation method comprises the steps of firstly, performing scene modeling, and performing rectangular meshing on a scene, wherein rectangular meshes of the field intensity are same in size and the meshes are uniformly distributed in a whole scene region; and secondly, calculating a field intensity value of a mesh center point by utilizing a forward ray tracing algorithm, storing the mesh center field intensity calculation value in a database, and then predicting a field intensity value of any field point in a whole field intensity region by utilizing three-step analysis data interpolation. The method is mainly applied to an electromagnetic wave field intensity prediction occasion.

A method for greenly synthesizing nanometer zero-valent iron by using grape seeds and its application, belonging to the field of nanomaterials and wastewater treatment. The preparation method is characterized in that at room temperature, the waste grape seed extract is used as a dispersant and an antioxidant to prepare nano-zero-valent iron particles, and the nano-zero-valent iron particles prepared by the method of the present invention have good dispersibility and stability sex. The nanometer zero-valent iron particles prepared by the present invention are used to catalyze and degrade reactive dyes in wastewater. Under the condition of dye wastewater pH=2-10, the azo dye reactive brilliant red K‑2G can be degraded by more than 98% within 9 minutes, and anthracene can be degraded by more than 98%. The quinone dye Reactive Brilliant Blue KN‑R degrades more than 95% within 30 minutes, and has strong environmental adaptability and high degradation efficiency. The method of the invention is simple in process, economical and efficient, realizes resource utilization of grape seeds, and the synthesized nanometer zero-valent iron has extremely strong activity and has wide application prospects.

The invention discloses a method for eliminating or reducing surface viscosity of bionic glue by using curing agents. The method comprises the following steps: spraying the curing agents on the surface of a plant which is sprayed with the bionic glue before the plant is harvested so as to eliminate or reduce the viscosity of the bionic glue; and then, carrying out other farming operations or harvests. The invention also discloses a corresponding liquid curing agent and a corresponding solid curing agent, wherein the liquid curing agent comprises the following components: 10-50% of poval, 0.05-0.1% of surfactant and the balance of water; and the solid curing agent is inert powder such as diatomite, zeolite powder, kaolin, attapulgite clay, molecular sieve or the like. The method disclosed by the invention has a good effect, and can obviously reduce the viscosity of the bionic glue; moreover, the curing agents disclosed by the invention are degradable materials or natural products, and are harmless to plants, animals and environment; and the liquid curing agent disclosed by the invention has a good waterproof property, and rainfall does not obviously influence the effect on reduction of the viscosity of the bionic glue.

The invention belongs to the technical field of plant breeding, and discloses a method for breeding male sterile lines and maintainer lines of sunflower with nucleoplasmic interaction, using the self-owned maintainer line B{N(rr)} as the target genetic receptor; heterozygous The plant (A×R){S(Rr')} is the bridge; the sterile line A{S(r'r') is the target genetic donor; the nuclear gene of the sterile line is continuously transferred to the maintenance type through the bridge In the plants, it finally contains more than 99% of the sterile line nuclear gene (r'r'), and finally becomes the matching maintainer line B{N(r'r')} of the sterile line. The invention enriches the types of the existing sunflower cytoplasmic male sterility maintaining lines and the method for transferring new sterility maintaining lines. The sunflower inbred line selected by the invention is stable, and the sterile line has complete sterility, and provides new germplasm resources for the utilization of sunflower heterosis. The new material created is stable and has excellent properties, and the purity of hybrid seeds assembled by using the new material can reach 100%, and the popularization and application effect is obvious.

The invention discloses a color migration method of color images. The color migration method is used to adjust the tone of a present color image by taking a specific color image as reference, and the tone of a processed output image is similar to that of the reference image. The color migration method comprises the steps of establishment an intermediate image, meshing and color migration. The method can be used to realize color migration between color images automatically and more effectively without manual intervention, especially a better color migration effect can be obtained under the condition that the tone of the image to be processed is greatly different from that of the reference image.