32results about How to "Reduce special requirements" patented technology

The invention provides a novel stem-loop oligonucleotide probe which is provided with the initial status of a stem-loop secondary structure and consists of a loop part and a stem part. The stem part is a hairpin structure which is formed from two complementary base sequences that are combined through hydrogen bond. An identification region which is combined with the specificity of a target molecule is mainly composed of the stem part sequence of the probe. When no target molecule exists, the identification region exists as the hairpin structure of the initial status. When the target molecule exists, the hairpin structure of the stem part disintegrates when the target molecule is combined with the specificity of the identification region, and the probe or the target molecule can produce signal differences that can be detected. The identification region of the invention probe specificity combined or complementary hybrid target molecule mainly or completely bases on the oligonucleotide sequence of the stem part structure. And the oligonucleotide sequence which competes with the target molecule exists in the probe molecule. Therefore, the probe of the invention is provided with higher specificity.

The invention relates to a driving device for a pulse laser. The driving device comprises a drive and power supply module and a laser module; the drive and power supply module comprises a power supply source unit and a pulse generating unit; the power supply source unit is used for supply power to the laser module and the pulse generating unit; the pulse generating unit is used for generating electrical pulses according to a required pulse parameter; the laser module comprises a pulse level conversion unit, a pulse current switch and the pulse laser; the pulse level conversion unit is used for stepping up the electrical pulses generated by the pulse generating unit to a required electrical level so as to meet the driving requirements of the pulse current switch; the pulse current switch is used for driving the pulse laser; the power supply source unit is respectively connected with the pulse level conversion unit and the pulse laser through power supply leads; and the pulse generatingunit is connected with the pulse level conversion unit through a coaxial cable. According to the driving device for the pulse laser, the short driving distance of the pulse laser can be prolonged, and the driving quality can be improved.

The invention discloses an inherent frequency measuring device for 600 DEG C high-temperature thermal vibration coupling test of a high-speed cruise missile airfoil surface. The device comprises a missile airfoil surface structure test piece, a quartz lamp heating array, a vibration exciter, a ceramic extension rod, an acceleration transducer, a computer and a heat insulation baffle plate. In the high-temperature thermal vibration coupling test of the cruise missile airfoil surface, the missile airfoil surface is quickly heated by using the quartz lamp heating array and generates random vibration through the vibration exciter at the same time to form a 600 DEG C high-temperature thermal vibration coupling test environment. The rigid ceramic extension rod with high rigidity and high temperature resistance is arranged on the missile airfoil surface to guide the vibration signals on the missile airfoil surface out of the high-temperature thermal field, and the high-temperature resistant lightweight ceramic fiber heat insulation baffle plate is used for implementing thermal diffusion prevention shielding for the radiation thermal field. The normal temperature acceleration transducer arranged at the cold end of the ceramic extension rod dynamically tracks and measures the vibration signals guided to the missile airfoil structure of the normal temperature zone to acquire the change rule of the inherent frequency of the missile airfoil surface under the high-temperature thermal vibration coupling test environment; and the device provides an effective dynamic high-temperature thermal vibration coupling test means for researching and manufacturing high-speed cruise missiles.

The invention provides an improved preparation method for agomelatine. The method comprises the following steps of: carrying out reduction reaction with (7-methoxy-1-naphthyl) acetonitrile used as a starting raw material and methanol used as a reaction medium in the presence of nickel chloride hexahydrate and a reducing agent, and then carrying out acetylation reaction with acetic anhydride to generate agomelatine; and separating and purifying a reaction liquid after reaction, drying, decoloring and recrystallizing to obtain agomelatine. The preparation method provided by the invention employs a one-pot synthesis process, shortens synthesis steps, and reduces the difficulty in product purification caused by multiple secondary reaction; the reaction conditions are mild, and the cost and potential safety problem are reduced; a catalyst for the reaction is low; and the product acquired by the process has high yield and high purity, thus promoting the industrial production of agomelatine.

The invention relates to a scrap steel preheating system for an electric arc furnace, which realizes the preheating for steelmaking raw materials for the electric arc furnace by fully utilizing the physical and chemical waste heat of high-temperature flue gas of the electric arc furnace and enables a dust removal system to filter and cool the high-temperature flue gas to achieve the purposes of energy saving, reduction of consumption, emission reduction and environment protection as well as improve the steelmaking production ratio of the electric arc furnace and to realize the investment and alteration of preheating scrap steel by high-temperature flue gas in a current old factory workshop. The scrap steel preheating system for an electric arc furnace comprises scrap steel preheating basket mechanisms and a basket rotation swing mechanism; the basket rotation swing mechanism is respectively connected with the scrap steel preheating basket mechanisms positioned at a scrap steel receiving position and a scrap steel preheating position through swing supporting frames; and a high-temperature flue gag water-cooling flue and a scrap steel preheating cap are arranged between the basket rotation swing mechanism and the upper end of the scrap steel preheating basket mechanism at the scrap steel preheating position.

The invention relates to a metal component detection method and device based on a spectrum analysis technology. The metal component detection device comprises a sampling robot, blowing equipment, a pulse laser, spectrum detecting equipment, spectrum analysis equipment and control equipment, wherein the ultrashort pulse output end of the pulse laser is opposite to a sample chamber; the ultrashort pulse output end of the pulse laser is aligned with a spectrum collection lens group in the spectrum detecting equipment; the air outlet of the blowing equipment is aligned with the sample chamber; the sample chamber comprises a tray and a transparent outer cover above the tray; the sampling robot comprises a first mechanical arm and a second mechanical arm. Through the adoption of the method and device, non-contact metal component analysis is realized through laser, automation process is realized through the sampling robot, artificial participation is not required, ultrashort pulse laser is adopted, and the device has good spectral characteristic, and is simple in structure, convenient to apply and suitable for large-scale promotion and application.

The invention discloses a preparation method of organized half-mature bacterial fertilizers for orchids. The method comprises the following steps: taking colza cakes and potassium sulfate as raw materials, inoculating various good bacteria in chestnut leaves at orchid native home into the raw materials, then stacking the raw materials to ferment, controlling the fermenting process of the raw materials in a water supplementing and stack-turning manner during the fermenting process, and obtaining the organized half-mature bacterial fertilizers after stacking and fermenting for 15 to 20 days. The organized half-mature bacterial fertilizers prepared by the invention have the advantages of immature fertilizers and full-mature fertilizers, are rich with flora and metabolic products of flora suitable for growth of orchid roots, are especially suitable for cultivation of edaphic orchids, and obtain favorable cultivating effects after being cultivated for two years. The organized half-mature bacterial fertilizers can serve as not only fertilizers for orchids but also strains of orchid planting materials.

The invention discloses a method for hoisting an FPSO (floating production storage and offloading) flare tower by using a floating crane. The method comprises the following steps that the flare tower is overturned by using the floating crane under the assistance of a crawler crane in a flare tower hoisting area, then, the connection between the crawler crane and the flare tower is released, the floating crane is moved to move the flare tower to a position above a flare tower base on an FPSO, and then, the flare tower is slowly lowered, the flare tower gradually gets close to the flare tower base through chain blocks installed on the flare tower, and meanwhile, the flare tower is hoisted in place through constraint of guide plates installed on the flare tower base in advance, and finally, the flare tower is welded under the condition that the floating crane is kept in a hoisting state, after welding is finished, connection between the floating crane and the flare tower can be removed, and hoisting of the flare tower is finished. According to the method, the flare tower can be hoisted to the flare tower base through existing equipment, and welding of the flare tower and the flare tower base is completed.

The invention relates to a safe and efficient preparation method of an important raw material 9,9-dimethyl xanthene of an industrial catalyst Xantphos, and belongs to the technical field of fine chemical engineering. According to the preparation method, diphenyl ether, acetone and an acid catalyst serve as raw materials, a molar ratio of the raw materials is 1:1:(2-5), 9,9-dimethyl xanthene is prepared through a one-pot method, the yield can reach 70%-75%, and the content is 99% or above. According to the method, acid-catalyzed activated acetone and diphenyl ether are adopted for electrophilicsubstitution reaction to replace extremely dangerous trimethylaluminum and xanthone used in the traditional process for reaction, and the method has the characteristics of cheap and easily availableraw materials, safety in operation, high reaction speed, low requirements on production equipment and the like; and the production difficulty of the product is greatly reduced, and the yield of the 9,9-dimethyl xanthene can be rapidly increased.

The invention discloses a parallel single-ground-wire ultrasoft wire which comprises a core unit, a core wire assembly and an external protection assembly; the core unit comprises two first core pairsand two filling ropes, the two first core pairs are arranged in parallel, the two first core pairs are arranged in the two sides of the two first core pairs respectively, and the two first core pairsand two filling ropes are enclosed into a circle; the core wire assembly comprises second core pairs, each second core pair is wound around the core unit, and the outer wall of each second core pairis tightly fit to the outer wall of the core unit; and the external protection assembly comprises a shielding tape and an external tape, the shielding tape horizontally wraps the core wire assembly, and the external tape is spirally wound around the shielding tape. Thus, the insert loss performance and reflection loss performance can be improved, the wire feels softer, and the structure is more compact and more stable.