812results about How to "Protection stability" patented technology

The invention relates to a presplitting explosion method. A row of presplitting holes (3) with small diameters are drilled along designed excavation profile between the exploitation region and the boundary slope. Cushion holes (2) are designed parallel to the presplitting holes (3) and disposed between a main blast hole (1) and presplitting holes (3). The specific steps are as follows: a. determining parameters of the presplitting explosion holes, drilling; b. determining matched explosive load, loaded constitution, loaded ingredients, pack height and explosion initiation manner, implementing explosion. The invention is adaptive to explosion construction of highway cutting, large-scale hydropower station, metal mine exposed for long time. Integrality and stability of boundary rock mass are protected, occurrence of landslip is prevented, good and safe production environment is provided for mine, and good social efficiency and economic efficiency are provided.

The invention discloses preparation and application of exosome secreted by human derived blood or mesenchymal stem cell. The preparation process of exosome comprises: extracting mesenchymal stem cells from health-human body blood or a stem cell culture supernatant, performing in-vitro culture and amplification, and utilizing means such as low-temperature separation, purification and the like to prepare high-purity high-bioactivity exosome. The blood or mesenchymal stem cell secreted exosome is added into medicines, health-care products and cosmetics according to ratios for developing of products with bioactivity, is capable of effectively regulating and controlling body cell signal transduction, activating cell regeneration, enhancing health cell proliferation and differentiation capacity, further regulating physiologic restoration or removing damaged, pathologic and aged cells of a body, fundamentally changing body physiologic functions, and helping to generate anti-tumor treatment effect by adjusting cellular immunity. The blood or mesenchymal stem cell secreted exosome is applicable to fields of medical science, health care and beauty treatment, and has wide application prospect.

Construction features of roadbed are as follows: building vent-pipes perpendicular to direction of roadbed in certain depth of road embankment; installing ventilating units of automatic controlling temperature at end part of vent-pipe; setting up thermal-protection material between vent-pipes/entire up part of vent-pipes with earth material being covered and tamped. The said automatic controlling ventilating units carries out heat exchange between inside roadbed and airflow in low temperature outside. The thermal-protection material protects ever frost effectively. Thus, the invention prevents frost heave and thaw collapse caused by season change so as to keep stability of roadbed in high level. The invention solves issue of carrying construction in zone of frozen earth.

The invention relates to drug-loading nano-micelles, and a preparation method and an application thereof. According to the to drug-loading nano-micelles, a polyethylene glycol derivative-polylysine-polyleucine amphiphilic triblock copolymer is adopted as a carrier, and self-assembly is carried out in a water solution, such that nano-micelles with a three-layer structure transferring gene and medicine are formed. With the hydrophobic effect between polyleucine, the copolymer forms a core of the micelles in water, such that a hydrophobic medicine docetaxel is entrapped. With polylysine, the nano-micelles are positively charged, such that negatively charged anti-apoptotic protein small interfering RNA can be bonded. Polyethylene glycol is used for protecting the stability of the nano-micelles loading the medicines and gene, and a cycle time of the nano-micelles in vivo is prolonged. The nano-micelles are used for loading both an anti-apoptotic protein small interfering RNA gene medicine and a docetaxel medicine, such that the gene treatment medicine and the chemotherapeutic medicine cooperates in treating cancer, and a synergetic effect of the two medicines can be developed. Therefore, a direction is provided for better treatment of breast cancer.

The invention discloses a broadband terahertz linear polarization wave asymmetric transmission device based on a metamaterial, and belongs to the field of transmission control devices of electromagnetic waves. The device comprises several basic units which are periodically arranged on an xy plane in the same direction, wherein each basic unit comprises five layers of structures which are arrangedsequentially, namely the dielectric layer 1, the metal layer 2, the dielectric layer 3, the metal layer 4 and the dielectric layer 5 from top to bottom in sequence, and the thickness of the dielectriclayer 3 is generally far larger than the that of the dielectric layer 1 and the dielectric layer 5; the metal layer 2 and the metal layer 4 are metal graphs which are constituted at the two sides ofthe dielectric layer 3 through technologies like photoetching or electron beam lithography; the graph constituted by the metal layer 4 is obtained by rotating the graph of the metal layer 2 by 90 degrees along the axis or through mirror symmetry. Dielectric film at the upper layer and the lower layer can be used for protecting the metal layers against abrasion and the stability of the device. Thebroadband terahertz linear polarization wave asymmetric transmission device is simple in structure and easy to prepare; one-way transmission of broadband terahertz linear polarization conversion is effectively achieved, and the device has an important significance in developing terahertz functional devices.

The application provides a data processing method and system and relates to the technical field of networks. The method includes: receiving a bill downloading request of a user client, based on a bill page; parsing query information in the bill downloading request, wherein the information includes a user identification and bill query condition information; acquiring the total quantity of data to be downloaded in a database according to the bill query information and judging whether the total quantity of the data satisfies a threshold condition; if yes, stopping a synchronization response to the bill downloading request and entering an asynchronous bill file generation process based on the user identification and the bill query condition and prompting the user client to enter a downloaded-file storage area in a delayed manner to download bill files; and with respect to the asynchronously generated bill files, transferring the asynchronously generated bill files to a downloaded-file storage area corresponding to the user identification according to a client identification. The data processing method and system reduce the pressure of the system through an asynchronous method so that stability of the system can be protected.

The invention relates to a method for storing integrity of nucleic acids (DNA and RNA) in a sputum sample in the field of biology. The invention provides phlegm paper, which can be used for conveniently storing nucleic acids in the sputum sample at room temperature; nucleic acid protecting liquid is infiltrated on the phlegm paper, and can be used for inactivating nuclease in the sputum sample; DNA and RNA in the sputum are effectively prevented from being degraded, so as to store and transport the sputum sample. At room temperature (25-35 DEG C), the nucleic acids in the sputum sample can be stably kept for 7-14 days. Meanwhile, the invention also provides a corresponding nucleic acid extraction method.

The invention discloses a liquid carbon dioxide blasting induced caving mining method. During operation, a reusable carbon dioxide blaster instead of an explosive is delivered into a blast hole; the liquid carbon dioxide in the tube is vaporized under an electrified heating condition to form a high-pressure gas; the blasting energy of the high-pressure gas leads to quick development of joint fissures inside the ore body, and therefore, the ore body is capable of collapsing continuously and naturally under the action of the gravity stress. The liquid carbon dioxide blasting induced caving mining method is suitable for exploiting fracture, joint or structure developed large massive ore deposits or above medium-thick steep-dip solid underground mines crushed to medium solid degree. The method is controllable in blasting energy and release manner, and has the characteristics of operation safety, high production efficiency and low mining cost; the blaster is reusable.

The optical disc device includes a main unit rotating a turntable when a disc is coupled to the turntable and including an optical pick-up unit writing/reading data to/from the disc; a lever member guiding the disc to load the disc to a position at which a center of the disc is aligned with a center of the turntable and reversely guiding the disc to unload the disc, the lever member being capable of loading/unloading discs having various diameters; and a driving unit actuating the lever member. The method of controlling the optical disc device includes detecting a diameter of a disc; loading the disc to a position at which a center of the disc is aligned with the center of the turntable; coupling the disc to the turntable; and moving the lever member away from the disc to allow writing/reading data to/from the disc to be performed.

The invention discloses a micrometer/nanometer fiber composite filtering material and a preparation method thereof. The material comprises nanometer fiber and a single-layer micrometer fiber net; andthe structure is as follows: single or bunchy nanometer fiber is distributed on the surface of the single-layer micrometer fiber net uniformly or is embedded in a fiber assembly gap of the single-layer micrometer fiber net uniformly. The method comprises the following steps: preparing electrostatic spinning liquid; preparing the single-layer micrometer fiber net from micron-sized fiber and conveying the single-layer micrometer fiber net to a net conveying curtain with meshes; starting to perform electrostatic spinning by using the electrostatic spinning liquid, jetting single or bunchy nanometer fiber on the single-layer micrometer fiber net uniformly from an electrostatic spinning nozzle to form a single-layer micrometer/nanometer fiber composite net; and forming a continuous multi-layerstructure composite fiber net by using the single-layer micrometer/nanometer fiber composite net by a cross lapping mode, and performing mechanical consolidation to obtain the micrometer/nanometer fiber composite filtering material. The method is simple in production process, high in controllability and easy in industrialization.

The invention relates to a preparation method of a mulberry fruit wine. The preparation method comprises the following steps of (1) preparing a mulberry pulp solution; (2) heating the mulberry pulp solution, then, mixing the mulberry pulp solution with water, and regulating sugar content to prepare a mixed juice; (3) inoculating a yeast into the juice, and fermenting to prepare a fermentation solution; (4) adding pectinase into the fermentation solution, adding egg white powder, and filtering to prepare a raw wine solution; (5) regulating the alcoholic strength of the raw wine solution, putting the raw wine solution into canful storage in a dark place, and degerming to obtain the mulberry fruit wine. Raw mulberry juice is treated in ways of heating and passivating the activity of polyphenol oxidase, so that the stabilities of nutrient substances in mulberries and color agents in a brewing process are protected. In addition, the polyphenol substance loss caused by polyphenol oxidase is reduced through heating and passivating the activity of polyphenol oxidase and cutting off a brown stain path; due to the combination of clarification treatment, the problem of easily-caused melanin sedimentation of the mulberry fruit wine is solved, and the mulberry fruit wine with stable quality is obtained.

The invention relates to a lithium phosphate coated lithium iron phosphate electrode and a preparation method thereof, belonging to the technical field of electrode materials for lithium secondary batteries. The surface of the lithium iron phosphate electrode is coated with nanoscale glassy state lithium phosphate. The electrode preparation method comprises the following steps of: mixing lithium phosphate powder and an organic solvent, carrying out ball-milling on the mixture to form pulp, drying the pulp to obtain powder, compacting the powder into a lithium phosphate target precursor, and then calcining to obtain a lithium phosphate target; carrying out magnetron sputtering on lithium iron phosphate electrode (serving as substrate) and the lithium phosphate target to obtain the lithium phosphate coated lithium iron phosphate electrode, wherein the distance between the target and the substrate is 4-8cm, and the background intensity of pressure is less than or equal to 10*10<-5>Pa. The electrode has high lithium-ion conductivity, and also the capacity of the electrode is improved; the coated lithium phosphate has good chemistry and electrochemical stability and can be used for protecting the stability of the electrode structure; the preparation method is simple and low in cost; and the large-scale production is easy to realize.

The invention relates to the technical field of preparing solid-phase Fenton catalyst, in particular to a preparation method of graphite carbon coated iron-nitrogen-carbon solid fenton catalyst and its application in organic wastewater treatment. The preparation method of the catalyst comprises the following steps: after mixing and melting the carbon source and the nitrogen source in a certain proportion, adding a certain proportion of iron source, fully stirring and dissolving the mixture, transferring the mixture to an oven at 150-180 DEG C for drying for 12-24 hours, and calcining under theprotection of nitrogen atmosphere to obtain the catalyst. The catalyst prepared by the invention is a graphite carbon coated FeN and Fe3C coexisting iron-nitrogen-carbon catalyst, the size of the nanoparticles is 5-30nm, the specific surface area of the catalyst is 80-300m2/g, and the FeN is the main active site for decomposing hydrogen peroxide. The catalyst of the present invention can be applied to electric-Fenton and Fenton systems and an organic wastewater with pH range of 3-9 is treated. The preparation method of the invention has the advantages of simple steps, easy availability of rawmaterials, excellent performance, high stability and recyclability.

The invention discloses an anti-dropping and shock-proof transformer oil tank. The oil tank comprises a shock-absorption spring, a groove and a threaded hole, wherein during use, two pull rods are pulled to squeeze springs in clamping grooves, rotary rods are rotated, so that first door plates are glided, and an opening of a tank body is opened; an oil tank is put on the upper surface of a shock-absorption frame, each nut and the corresponding gliding rod are in threaded tightening, the rotary rods are rotated, each rotary rod between the corresponding pull rod and the tank body is removed, the whole oil tank is fixed through baffles, in the oil tank collision process, the shock-absorption frame is squeezed under the collision force and moves downwards to squeeze the internal shock-absorption springs, the collision force is buffered, and the situation that the shock-absorption springs are out of elasticity due to long-term squeeze can be prevented under the action of rubber pads. A transformer box is convenient to mount, the oil tank is convenient to mount and dismount, anti-dropping and shock-proof, the situation that the oil tank is damaged due to the fact that a transport worker collides the oil tank carelessly in the carrying process can be prevented, the stability and the safety of the oil tank are further protected, and noise produced in the running process of a transformer can be reduced with the adoption of the double-layer tank body.

The invention relates to the field of medicaments, and provides a medicinal composition for improving reproductive capability and a preparation method and application thereof. The medicinal composition comprises vitamin E, coenzyme Q10 and/or selenium, and can be used for preparing a medicament and a health product for preventing and treating dysgenesis caused by oxidative stress, endocrine disorder or environmental factor induction when serving as a novel high-efficiency antioxidant. The medicinal composition has the advantages of improving the movement and vitality of sperms, increasing the secretion of sex hormones, protecting the functions of ovaries, improving immunity, improving conception rate, ensuring the nutrition of fetuses, and more effectively treating infertility by combining the conventional medicament vitamin E for treating the infertility and a novel therapeutic medicament coenzyme Q10 and/or selenium and applying different mechanisms for treating the infertility. Compared with any one component in the medicinal composition, the medicinal composition can not only effectively improve curative effect, but also overcome the defects when the components are singly used.

The invention discloses a preparation process of standard coprophilous fungi freeze-dried powder in transplantation therapy of coprophilous fungi. The preparation process comprises the following steps: (1) preparing standard coprophilous fungi liquid; (2) preparing a freeze-dried protecting agent; and (3) carrying out three-step-method freezing and vacuum drying, wherein the freeze-dried protecting agent is prepared by the steps of respectively adding 10%-20% of mycose, 5%-10% of glycerin and 0.02%-0.05% of vitamin C into sterile normal saline, uniformly mixing, filtering, and removing bacteria. According to the special freeze-dried protecting agent, the activity loss of the coprophilous fungi can be prevented, and the survival rate of the coprophilous fungi is increased; and by virtue ofa special freeze-drying procedure, the coprophilous fungi can rapidly enters a dormant state, so that the activity loss is avoided, and the stability of effective components is effectively protected.Experiments show that by utilizing the freeze-dried powder prepared by virtue of the preparation process, the activity of the coprophilous fungi in excrements is effectively maintained, and the survival rate of the coprophilous fungi is greatly increased.