51results about How to "Avoid processing steps" patented technology

The invention relates to a method for preparing gamma-valerolactone with high selectivity under the mild condition. The method comprises the following steps of: under the conditions of optimal room temperature and inert gas, with secondary alcohol as a hydrogen source and active Raney nickel as a catalyst, carrying out hydrogen transfer reaction on a levulinic acid ester compound to obtain the gamma-valerolactone. The invention particularly relates to a method of preparing gamma-valerolactone by a lignocellulose derivative with high selectivity under the mild condition, which comprises the following steps of: carrying out alcoholysis reaction on the lignocellulose derivative such as fructose, 5-hydroxymethylfurfural or furfuryl alcohol by a solid acid catalyst in the presence of an alcohol solvent at certain temperature, filtering solid acid, collecting liquid, and obtaining levulinic acid esters through reduced pressure distillation; and with the secondary alcohol as the hydrogen source, catalyzing the obtained esters by Raney Ni as a non-noble metal catalyst at the room temperature to obtain the gamma-valerolactone with high yield.

The invention discloses a processing method for an inner-ring-free cylindrical roller bearing alloy steel solid retainer, and relates to the technological field of bearings. The problems that after anexisting bearing retainer processing process, the working accuracy of a pocket hole of the bearing retainer and the surface roughness of the pocket hole do not reach the standard, and rolling surfacecan generate cracks in the lock opening rolling process are solved. The processing method comprises the following processes of lathe forming, hardening and tempering, rough grinding of the outer diameter, fine lathing of the two end faces, fine lathing of the inner diameter, even grinding of the two end faces, final grinding of the outer diameter, final grinding of the inner diameter, turning ofinner steps, marking, drilling, milling of square holes, pulling of the square holes, deburring, cleaning, stress relief annealing, glazing, lock opening rolling, dynamic balancing, magnetic powder inspection, silver plating, final inspection and packaging. According to the processing method, stress relief annealing is carried out before lock opening rolling is carried out, and the cracks generated by machining stress superposition and a surface cold hardening layer on the rolling surface are avoided. The processing method is suitable for processing the inner-ring-free cylindrical roller bearing alloy steel solid retainer.

The invention relates to an electromagnetic pulse-welding device for joining a metal sheet to a metal part, consisting of an electric energy source which is connected to a coil by means of a current conductor, the active part of said coil being in the direct proximity of the metal sheet, said metal sheet being at a distance from the metal part. The passive part of the coil has a larger cross-section than the active part and said active part borders on one part of the surface in a positive fit, to a cooling insulator, the material having a relatively high thermal conductivity and a relatively low magnetic and electric conductivity compared to the material of the coil.

The invention relates to a high-selectivity preparation method of pyrrole compounds, which comprises the following steps: feeding organic materials and an acidic catalyst into a reactor; and reacting the organic materials in the reactor in the presence of gas containing reactive nitrogen compounds under heating conditions under the action of the catalyst, thereby generating a reaction system stream comprising one or more nitrogenous aromatic compounds, wherein the selectivity of the pyrrole compounds is up to higher than 80%.

The invention discloses a preparation method of a graphene-based thick and dense electrode. The method comprises the following steps of preparation of graphene hydrogel, compounding of graphene and a salt component, aerogenesis and removal of the salt component and preparation of the graphene-based thick and dense electrode. According to the method, a three-dimensional porous graphene block material is prepared according to the pore-forming effect of aerogenesis salt on a graphene network in the heating process. Compared with other pore-forming methods, the aerogenesis salt does not etch graphene in the heating process, the yield of the graphene is high, and the method is suitable for batch production of the porous graphene material; gas generated after heating is removed, and therefore the obtained graphene has few impurities and is high in purity; a small quantity of remaining impurities occupy pores of the graphene, and a secondary pore-forming effect is achieved on the graphene network after washing. The graphene is of a three-dimensional formed block structure and can be directly applied to an electrode material, the electrode has large thickness and density, and the processing step of preparing the electrode from powdery graphene is avoided.

The invention relates to a method and a device for data access permission control, computer equipment and a storage medium. The method comprises the following steps: monitoring a data access instruction triggered based on a service application, wherein the data access instruction carries a user identifier and a data identifier of data to be accessed; determining a role of a target user corresponding to the user identifier in a service application; determining an organization node corresponding to the target user in a preset organization structure tree when determining that the target user hasthe operation authority for the service application according to the role; taking the organization node corresponding to the target user as the organization node of the current level to traverse whether each organization node in the organization structure tree has the access permission to the target data corresponding to the data identifier or not until the organization node of the lowest level isreached; and when one or more low-level organization nodes directly or indirectly connected with the current-level organization node have the access permission to the target data, displaying the target data. By adopting the method, the authority management flexibility can be improved.

The invention discloses a message reminding method and a communication interception method. The message reminding method comprises the following steps: adding first communication information of a first target user to a first blacklist and generating an interception reminding message by a second target user, acquiring the first communication information of the first target user, and sending the interception reminding message to the first target user according to the first communication information; and after receiving the interception reminding message by the first target user, acquiring secondcommunication information of the second target user, when a communication request is received, judging whether to establish a communication connection with the second target user through the second communication information according to the communication request, and if yes, intercepting the communication request. The invention further discloses a terminal and a computer storage medium. Through the implementation of the above scheme, the first target user can know that the first target user is a blacklist user of the second target user, so that the problem that communication resources are wasted due to the fact that the first target user sends the useless communication request to the second target user is avoided.

In a method and an apparatus for treating tubular knitted goods containing elastomeric fibers, the goods are effectively relaxed, expanded, and heat fixed or set in the desired expanded condition, while maintaining the tubular configuration of the goods and without cutting open and re-sewing the tubular configuration of the goods. The tubular knitted goods are continuously transported through a relaxing process followed by a heat fixing process and then a cooling process, while constantly maintaining the tubular structure of the goods. The goods are expanded in the radial or width direction by a tubular expander, and in the lengthwise direction by being transported between a feed roller arrangement and a draw-off roller arrangement operating at different transport velocities respectively. The temperature in the heat fixing chamber is preferably over 200 DEG C. and the transport velocity of the tubular knitted goods can be greater than 18 m/min.

The invention discloses a motor synchronous control method, an apparatus thereof and a system thereof. The method comprises the following steps: when determining a present modulation mode is synchronous modulation according to an obtained present modulation ratio and stator frequency, determining present frequency division amount; determining preset switching angle and a stator flux threshold corresponding to the modulation ratio and the present frequency division amount; comparing an obtained feedback linkage threshold with the stator linkage threshold, and outputting a control signal according to a comparison result. According to the motor control method disclosed in an embodiment of the invention, through a switching angle calculated in advance corresponding to a modulation ratio, the stator linkage threshold corresponding to the switching angle is determined, an actual feedback linkage threshold and the stator linkage threshold are compared, according to the comparison result a control signal is outputted, over-modulation and a further step of processing over-modulation area caused by adding the modulation ratio are avoided. Control flow of a system is simplified, working efficiency is raised, and an orbit of the motor stator becomes a regular polygon.

The invention relates to a thin-layer identification method for vitality-preserving soup and similar formula extracts and preparations thereof which can be used for identifying main medicines such as ginseng, astragalus membranaceus and liquorice in the vitality-preserving soup and the similar formula extracts and preparations thereof at the same time, avoids independent sample preparation, plate application, development, color development and inspection of three medicines, and the method is simple to operate, short in detection period and high in inspection efficiency. A thin-layer chromatogram obtained by the method is good in separation degree and clear in spot color development, and the use of irritant reagents such as ammonia water, trichloromethane and glacial acetic acid is avoided.

The invention relates to a method for doping synthesized sulfur with graphene. The problems that in the prior art, a sulfur-doped graphene preparation process is complex, high in cost and low in yield are mainly solved. Through the technical scheme of the method including the following steps of a, conducting ultrasonic stripping on graphite oxide in water to obtain a graphene oxide solution; b, freezing and drying the graphene oxide solution to obtain porous graphene oxide gel; c, making porous graphene oxide gel react with mixed gas of hydrogen sulfide and inert gas to obtain sulfur-doped graphene, the problems are well solved, and the method can be used for industrial production of sulfur-doped graphene.

The invention discloses a full-automatic groove broacher for wood processing. The full-automatic groove broacher comprises a machine frame. Two parallel rotating shafts driven by a driving mechanism to rotate are installed on the machine frame. At least two transmission belts are arranged on the two rotating shafts in a sleeving mode. Each transmission belt is evenly and fixedly provided with a plurality of transmission blocks. In work, wood is erected between two adjacent transmission blocks at corresponding positions of each transmission belt on all the transmission belts. A groove broaching tool located on a terminate section of a wood running route is arranged on the machine frame. A positioning wheel mechanism located above the groove broaching tool is further arranged on the machine frame. By means of the full-automatic groove broacher, in work, wood passes under the positioning wheel mechanism and is positioned through the positioning wheel mechanism making contact with the wood, no other motions are needed when the wood is positioned through the positioning wheel mechanism, excessive processing steps are avoided, processing time is shortened, and the wood processing efficiency is greatly improved.

The invention relates to the technical field of packaging machines, and discloses an edge shoveling mechanism for forming a paper box. The edge shoving mechanism comprises two oppositely arranged fixed plates and two guide frames. A pair of parallel pressing plates is arranged between the two fixed plates. The pressing plates and the fixed plates are connected through elastic guide assemblies. A first shoveling part and a second shoveling part are further included. The first shoveling part and the second shoveling part are each provided with a shoveling plate, and the shoveling plates are located on the side faces of the pressing plates. The shoveling plates are perpendicular to the pressing plates. The first shoveling part is connected with the fixed plates through elastic guide assemblies. The second shoveling part is connected with the guide frames trough elastic guide assemblies. The invention discloses a paper box forming machine including the edge shoveling mechanism and a paperbox forming process at the same time. Edgefolds of two opposite faces can be shovel-formed at a time, and a box type with an opening in one side can be formed at a time.

The invention discloses a method for preparing nitro orotic acid, and belongs to the field of chemical synthesis. According to the method, the conventional method for preparing the nitro orotic acid is improved. The method is characterized in that the nitro orotic acid (III) is obtained by performing nitratlon reaction of 6-methyl urea pyrimidine (I) and subsequent oxidation reaction of 5-nitryl-6-methyl urea pyrimidine (II) at the temperature of between 50 and 80 DEG C in the presence of a specific organic solvent and a catalyst, wherein the organic solvent is selected from at least one of chloroform, dichloroethane, dichloromethane, n-pentane, normal hexane or normal heptane; and the catalyst is acid, and preferably is concentrated sulfuric acid. By the method, the reaction can be performed stably at the temperature of between 50 and 80 DEG C, so that risk of a production process is reduced greatly, and the method has the great advantage in the aspect of safety. In addition, the product is high in purity, so that the purification coat is reduced, and the yield of the process is improved.

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a preparation method for a potassium-magnesium fertilizer. The preparation method comprises the following steps: removing sodium chloride from carnallite through evaporation and crystallization, and obtaining the potassium-magnesium fertilizer with the carnallite mass percentage not less than 95 percent. The invention also provides application of the potassium-magnesium fertilizer obtained with the preparation method. According to the potassium-magnesium fertilizer provided by the invention, on one hand, new application of the carnallite is provided, and a specific treatment way of the conventional conventional is changed, so that an old brine treatment problem produced by producing the fertilizer, such as potassium chloride and potassium sulphate, by utilizing the carnallite in the prior art is avoided; on the other hand, an obvious yield increasing effect can be achieved on crops bydirectly applying the potassium-magnesium fertilizer, and the potassium-magnesium fertilizer also has the characteristics of improving soil, resisting diseases and insect pests, preserving moisture and resisting drought, does not contain harmful substances, does not pollute environment, is an ideal potassium resource, and is particularly suitable for being prepared and applied in southeast Asia, thereby providing a new feasible way for utilizing carnallite resource of every country in the southeast Asia.

The invention discloses a preparation method and application of an immobilized binuclear rhodium metal complex catalyst. The immobilized binuclear rhodium metal complex catalyst is prepared from a metallic organic framework ZIF-8 which is formed by Zn<2+> and 2-methylimidazole and serves as a carrier as well as Rh[2](esp)[2] which is axially modified by the 2-methylimidazole and is distributed onthe carrier ZIF-8. The preparation method comprises the following steps: enabling a mixed system containing the Rh[2](esp)[2], the 2-methylimidazole and a solvent to be subjected to reaction under theroom temperature condition to form the Rh[2](esp)[2] axially modified by the 2-methylimidazole, and then, adding the Zn<2+> into the mixed system to be subjected to reaction at room temperature to obtain the immobilized binuclear rhodium metal complex catalyst. The 2-methylimidazole is adopted as an organic ligand for synthesizing the ZIF-8, is self-assembled with zinc ions to form the metallic framework of the ZIF-8, and is in axial coordination with the Rh[2](esp)[2]; and after coordination, not only the reaction activity of the Rh[2](esp)[2] is not affected, but the reaction selectively for catalytic synthesis of N-H propane compounds is improved, and the universality is realized.

The invention belongs to the technical field of biological engineering, and provides a method for preparing 1, 3-propylene glycol coupling bacteriophage produced by microbial fermentation. The methodcomprises the following steps of: inoculating klebsiella pneumonia into a fermentation culture medium, and taking glycerin as a substrate to ferment and produce 1, 3-propylene glycol; and taking fermentation broth or the bacterial sludge of the fermentation broth, and carrying out co-culture with a bacteriophage suspension so as prepare the bacteriophage. By use of the method disclosed by the invention, the problem in an existing bacteriophage preparation technology that pathogen host preparation wastes time and money is solved, and the problem of thallus processing and safety of 1, 3-propylene glycol production bacteria can be solved. The method gives consideration to 1, 3-propylene glycol fermentation and bacteriophage preparation, the preparation cost of the bacteriophage can be greatlysolved, worries about future of 1, 3-propylene glycol fermentation are eliminated, and the method disclosed by the invention is a method for preparing 1, 3-propylene glycol and bacteriophage, and hasa good industrial application prospect.

The invention relates to an icon processing method and a device thereof as well as a computer device and a storage medium. The method comprises the following steps: receiving prompt information sent by a server, wherein the prompt information comprises prompt icons, icon marks and icon size parameters corresponding to the prompt information; detecting whether the prompt icons matched with the iconmarks exist in a local database; determining whether the icon size parameters are consistent with preset size parameters or not if the prompt icons matched with the icon marks do not exist in the local database; shrinking and enlarging the prompt icons when the icon size parameters are inconsistent with the preset size parameters to obtain and save the prompt icons corresponding to the preset size parameters; and generating and displaying a user interface according to the shrunk and enlarged prompt icons, wherein the user interface comprises the shrunk and enlarged prompt icons. Through the adoption of the method provide by the invention, the unnecessary icon processing steps are avoided; the prompt icons meeting the preset size parameters can be displayed more timely; and the icon processing efficiency is improved.

The invention provides a preparation method of N, N-dimethylacetamide, which comprises the following steps: 1) enabling pentamidine hydrochloride and dimethyl acetylsuccinate to react under the action of organic amine to obtain 2-(2-n-butyl-4-hydroxy-6-methylpyrimidine-5-yl)-methyl acetate, wherein the pKa of the organic amine is 8-11.5; 2) enabling the 2-(2-n-butyl-4-hydroxy-6-methylpyrimidine-5-yl)-methyl acetate to react with dimethylamine, so as to obtain the 2-(2-n-butyl-4-hydroxy-6-methylpyrimidine-5-yl)-N, N-dimethylacetamide. The preparation method provided by the invention has the advantages of simple reaction and post-treatment process, high atom economy and low cost.

The invention relates to a method for selectively preparing a thiophene compound by using biomass. The method comprises the following steps: feeding the biomass and an acid catalyst into a reactor; in the reactor, in the presence of a gas containing reactive sulfur compound and under the heating condition, enabling the biomass to react in the catalysis of the catalyst to produce a reaction system flow containing one or more sulfur-containing aromatic compound, collecting liquid, and simply separating to obtain the thiophene compound.

The invention discloses a micro-fluidic chip-based procalcitonin PCT kit, and a preparation method and a detection method thereof. The preparation method of the kit comprises the following steps: (1)micro-fluidic chip coating; (2) fluorescence microsphere labeling; (3) micro-fluidic chip assembling; (4) preparation of a calibration substance; and (5) obtaining of the micro-fluidic chip-based procalcitonin PCT kit. The prepared PCT kit adopts a double-antibody sandwich technology to achieve detection, a highly sensitive time-resolved fluorescent substance is selected as a marker, the fluorescent microsphere is labeled with an antibody, the immunoreaction of an antibody pair is used to achieve analysis and detection, and the performances of a reagent prepared in the invention reach the level of a same chemiluminescent reagent. Superfluous components are completely removed by using a cleaning solution after an immune reaction, and fluorescent microspheres combined in the immune reactionare detected and read, so the problem of the insufficient reaction of a color developing solution in the chip or an untimely reading after color development is avoided.