88results about How to "Small fluctuations in performance" patented technology

The invention discloses a bandwidth-adjustable operational amplifier circuit. The operational amplifier circuit comprises a bias circuit, a fully differential operational amplifier main circuit and a common mode feedback circuit, wherein the bias circuit is used for providing stable bias current irrelevant to temperature and a process for the fully differential operational amplifier main circuit and the common mode feedback circuit; the fully differential operational amplifier main circuit is of a two-stage amplifying rail-to-rail output structure, and is used for providing gain and required bandwidth under the action of the bias current and outputting a common mode level to the common mode feedback circuit; and the common mode feedback circuit is used for stabilizing the common mode level output by the fully differential operational amplifier main circuit to a constant voltage. The bandwidth-adjustable operational amplifier circuit disclosed by the invention can be widely applied to radio frequency and analogue integrated circuits, such as active power filters, trans-impedance amplifiers and the like which need to work under various bandwidths. The bandwidth-adjustable operational amplifier circuit has the advantages that the power consumption is low, the integration level is high, the configuration is simple, and the working is stable, and adapts to various different load conditions.

The invention relates to super-thick steel and a heating process thereof, in particular to super-thick high-level boat plate steel and a normalizing process thereof. The super-thick steel comprises the following components by weight percent: 0.06% to 0.18% of C, 1.00% to 1.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.35% of Si, 0.03% to 0.30% of Ni, 0.03% to 0.20% of Cr, 0.02% to 0.25% of Cu, 0.020% to 0.050% of Alt, 0.010% to 0.040% of Nb, 0.003% to 0.060% of V and the balance of Fe. The normalizing temperature ranges from 880 DEG C to 940 DEG C; the temperature keeping time ranges from 0.8H minutes to 1.5H minutes, wherein H is the thickness of a steel plate; and the cooling speed is from 1 DEG C/S to 5 DEG C/S. The defects of nonuniform internal and external structures, obvious performance fluctuation, and the like in the rolling process of the super-thick plate are eliminated by normalization, thereby the productquality is improved, the product competitiveness is enhanced and the defects of the structure of the super-thick high-level boat plate steel are eliminated.

The invention discloses a preparation method of wide and thin hot-rolled steel plates with the width-to-thickness ratio being greater than or equal to 500, which belongs to the technical field of multi-layer metal stacking rolling. According to the preparation method, a multi-layer blank combined rolling method is adopted for producing the wide and thin hot-rolled steel plates and is characterized in that two to four layers of blanks are combined and welded into a whole so that the temperature reduction is relatively slow in the rolling process and accordingly the fluctuation in performance of the heads and the tails of the steel plates are relatively small; meanwhile, multiple layers of blanks are combined for rolling, so that the total thickness of the combined steel plates is increased, and accordingly, the phenomena, such as wave, edge camber, steel stacking and misroll, occurring in the rolling process are obviously reduced, and the buckling phenomenon and the like tend not to occur in the cooling process. According to the invention, multiple layers of steel plates are combined for rolling, so that control over the temperature uniformity is better, and the thickness precision is higher after the steel plates are separated.

The invention relates to a method for forecasting the mechanical property of a hot-rolled bar wire rod, belonging to the technical field of a mathematical model for forecasting the performance of metallurgy industry products. The technical scheme is as follows: (1) building a strength constitutive equation which comprehensively reflects contribution increment on the strength by a reinforcement mechanism; (2) building a microstructural evolution model of hot-rolled steel bar and wire rods; and (3) building a computer model, and forecasting the strength performance of the hot-rolled steel bar and wire rods. The method has the beneficial effect that the mathematical model for forecasting the mechanical property of a hot-rolled bar wire rod is built; chemical components for steelmaking are optimally designed, and the protection technology for steelmaking and steel rolling is optimally controlled; under the condition of lowering iron alloy addition, the steel performance fluctuation is reduced, the steel quality is stabilized, and the economic benefit for producing the hot-rolled bar wire rods is improved. The forecasting hit rate of yield strength is 82-94%, the forecasting hit rate of tensile strength is 82-97%, and the forecasting hit rate of elongation rate is 78-95%.

A slowly-releasing compound medicine in the form of tablet for treating and preventing thrombosis and apoplexy is prepared from aspirin, 2-(acetoxy) benzoic acid, slow-releasing dipyridamole, 2,2',2'',2''', [(4,8-dipiperidylpyrimido[5,4-d] pyrimidine-2,6-diyl) dihyponitido]-tetraethanol through granulating, tabletting and coating. Its advantages are high curative effect and equickly taking its effect.

The invention provides a manufacturing method for easy-to-weld carbon structure steel based on thin strip cast rolling. The easy-to-weld carbon structure steel comprises the following chemical components of, in percentage by mass, 0.01-0.04% of C, 0.4-0.7% of Mn, 0.10-0.25% of Si, less than or equal to 0.003% of Al, less than or equal to 0.02% and more than 0 of P, less than or equal to 0.005% andmore than 0 of S, and the balance Fe and impurity elements. The method comprises the following steps that raw materials is smelted to obtain molten steel with the qualified components; thin strip continuous casting is carried out to obtain a casted strip; and after being subjected to first-pass hot rolling with the rolling reduction of 10-50%, the casted strip is cooled through an air-mist cooling system, and then is coiled to obtain thin strip steel, wherein the temperature at an outlet of a rolling mill is 950-850 DEG C, and the coiling temperature is 450-650 DEG C. According to the method,the problems of traditional carbon structure steel that the production technology process is long, the energy consumption is high, and the production of thin-specification products is difficult are solved, and due to the low-carbon component design, the problem that welding is not facilitated due to the fact that the content of carbon in the traditional carbon structural steel is high is solved.

The invention relates to a perovskite material-based solar cell and a preparation method thereof. The perovskite material-based solar cell sequentially comprises a transparent substrate, a transparent conductive electrode, a hole transport layer or an electron transport layer, a perovskite layer, the electron transport layer or the hole transport layer and a metal conductive layer from a surface layer to an inner layer, wherein the perovskite layer comprises a lead halide complex; and the lead halide complex is a precipitate which is obtained by the following steps: mixing anhydrous lead halide powder (the general chemical formula is PbX<2>, and X is any one of Cl, I, Br three elements) with a dimethyl sulfoxide solvent or an N,N-dimethylformamide solvent or a tetrahydrofuran solution of methylamine, and completely dissolving the PbX<2> powder into the dimethyl sulfoxide solvent or the N,N-dimethylformamide solvent or the tetrahydrofuran solution of methylamine; and adding a chlorobenzene solvent for stirring and mixing, and then standing and filtering the mixture. According to the perovskite material-based solar cell and the preparation method thereof, the CH<3>NH<3>PbX<3-n>Y<n> crystal conversion condition is reduced; the PbX<2> impurity residue is reduced; the flatness of a film is improved; the light energy absorption efficiency of the perovskite layer film is improved; and the efficiency and the stability of the solar cell are improved.

The invention discloses a double-crystal hard alloy. The double-crystal hard alloy comprises tungsten carbide grains with particle sizes ranging from 1.6 micrometers to 2.0 micrometers and from 5 micrometers to 10 micrometers. The tungsten carbide grains comprise, by weight, 60-80% of the tungsten carbide grains with particle sizes ranging from 1.6 micrometers to 2.0 micrometers and the balance ofthe tungsten carbide grains with particle sizes ranging from 5 micrometers to 10 micrometers. The preparation method of the double-crystal hard alloy comprises the following steps of S1, grinding first tungsten carbide powder with the particle sizes ranging from 10 micrometers to 20 micrometers to obtain a first material; S2, mixing the first material, second tungsten carbide powder with the particle sizes ranging from 3 micrometers to 7 micrometers and cobalt powder for grinding treatment to obtain a mixture; and S3, granulating, pressing and sintering the mixture to obtain the double-crystal hard alloy. The double-crystal hard alloy can meet use requirements of machining, mold manufacturing and the like, and solves the contradiction problems that the high fracture toughness and the highhardness of a coarse grain WC-Co hard alloy are difficult to exist at the same time.

The invention discloses a method and device for checking data consistency of a distributed storage system, equipment and a computer readable storage medium, and the method comprises the steps: receiving a check request sent by a client, and judging whether the state information of a target object under different nodes of a distributed storage system is the same or not in a data reading and writingprocess; if the inconsistent state information exists in the plurality of redundant objects, judging whether the number of objects with consistent state information in the plurality of redundant objects is greater than or equal to a preset number threshold value or not; and if the number of the redundant objects is greater than or equal to the preset number threshold, judging that the data of theredundant objects is consistent, and processing inconsistent data in the redundant objects by utilizing a pre-established negotiation mechanism, so that the data of the redundant objects is completely consistent. According to the method, the device, the equipment and the computer readable storage medium provided by the invention, the data consistency checking efficiency is improved, and the influence on the cluster performance is reduced.

The invention relates to a rare-earth-containing 34Mn2V high-pressure gas bottle blank and a production method thereof, belonging to the technical field of metallurgy of iron and steel. The production process provided by the invention comprises the following steps: feeding molten iron into a blast furnace, pretreating the molten iron, performing converter smelting, performing LF (ladle furnace) refinement, performing VD (vacuum degasser) vacuum degasification, performing calcium treatment, adding rare earth, performing continuous bloom casting, rolling to obtain a finished blank of 200mm*200mm, sampling, performing heat treatment on the sample, and inspecting. By adopting the technical scheme, the invention has the following advantages in comparison with the traditional technology: the 34Mn2V high-pressure gas bottle blank is low in gas content of H, O and N, and the steel quality is clean; the cross section of the blank is light in carbon segregation degree and manganese segregation degree; the macroscopic structure is compact, the metallurgical structure is pearlite plus ferrite, the grain fineness is Level 7-9, and the level of inclusion in steel is low; the 34Mn2V high-pressure gas bottle blank is uniform in composition, structure and performance; the bottle punching process is fine in performance, is suitable for producing a high-pressure gas bottle through punching and is safe to use; the 34Mn2V high-pressure gas bottle is stable and uniform in performance, high in plasticity and impact property reservation margin and fine in comprehensive mechanical property.

A multilayer electronic part having the shape of a substantially rectangular parallelopiped is constituted which has a multilayer body formed by superposing coil conductors and green sheets of a magnetic or nonmagnetic material. Terminal electrodes are formed respectively on both ends of the multilayer body along the direction of the magnetic flux generating when current is caused to flow through the coil conductors in the multilayer body. The terminal electrodes each has a conductive substrate formed within the area of the end of the multilayer body and consisting of a lamination body as a component of the multilayer body.

The invention discloses pollution-free environment-friendly casting molding sand and a preparation method thereof. The pollution-free environment-friendly casting molding sand comprises, by weight, 30%-70% of SiO2, 6%-45% of MgO, 1.5%-15% of Al2O3, 0.3%-10% of CaO, 0.2%-8% of Fe2O3, 15%-30% of K2O, 2%-10% of Na2O, 0.5%-3% of Sb2O30, 1%-3% of TiO2 and 0.3%-0.5% of P2O5. The environment-friendly foundry molding sand developed and produced from the demands which meet the national industrial policies such as environment protection, cost advantages and improvement of the production efficiency and the finished product rat.

The invention provides a closed-loop control method for burdening of a blast furnace. The closed-loop control method comprises the steps of: presetting a control target of reasonable slag performance of a blast furnace; carrying out material tracking and parameter self-learning of the blast furnace; acquiring analytic component values of materials loaded in the blast furnace; acquiring loading calculating information and loading time of each batch of material at the top of the blast furnace; acquiring actual molten iron analytic components and actual slag analytic component values; acquiring actual iron discharging time and the like; determining whether the materials need to be changed or not according to preparation information to generate a material changing list of the blast furnace; acquiring a use status and the like of each trough of the blast furnace; and calculating a cutout quantity of materials in each trough according to the material changing list of the blast furnace, as well as the status of each trough and the like, and issuing the cutout quantity to a basic automatic system for being executed. The closed-loop control method is capable of specifying the slag performance control operation, plays positive roles in reducing slag performance fluctuation, stabilizing furnace condition, reducing labor intensity, increasing production efficiency and the like, and has a large actual value and a wide application prospect for medium and large blast furnaces with more perfect devices.

The invention provides a continuous polymerization method comprising the steps: (1) continuously contacting carboxylic acid, an alkyl aluminum compound and conjugated diene in a first reactor in the presence of an inert organic solvent to obtain a contact product, continuously contacting the contact product and a halogen compound in a second reactor to obtain a mixture, and continuously ageing the mixture in a tubular reactor to obtain a rare earth catalyst; and (2) continuously delivering the conjugated diene, the rare earth catalyst and the inert organic solvent to a polymerization unit under a polymerization reaction condition to perform contact, wherein the rare earth catalyst is obtained in step (1). By using the continuous polymerization method provided by the invention, the obtained polymer is relatively stable in molecular weight and molecular weight distribution, small in fluctuation and relatively stable in performance. In addition, the continuous polymerization method can be used for realizing continuity and integration of catalyst preparation and polymerization reaction, increasing the production efficiency and reducing the labor intensity and production cost so as to have an extremely wide industrial application prospect.

The invention discloses a low-nickel steel plate for a pressure vessel at low temperature of -120 DEG C and a production method thereof. The steel plate comprises the components: C less than or equal to 0.04, Si less than or equal to 0.05, Mn between 0.85 and 1.50, P less than or equal to 0.005, S less than or equal to 0.003, Alt between 0.015 and 0.050, Ni between 2.00 and 3.00, Cu between 0.35 and 0.50, Cr between 0.55 and 1.00, N less than or equal to 0.004, at least one of Mo less than or equal to 0.35, Nb less than or equal to 0.05, Ti less than or equal to 0.025 and Ca less than or equal to 0.005, and Fe and inevitable impurities as the rest. According to the low-nickel steel plate, the defect of high cost of existing steel can be overcome, a feasible production process is adopted, mass production operation is facilitated, and pressure vessel steel with good low-temperature toughness, excellent impact performance and strong welding performance is obtained.

The invention provides steel for a titanium-boron composite micro alloying afterheat treatment steel bar. The steel comprises the following chemical components by weight percent: 0.15-0.25% of C, 0.35-0.80% of Si, 0.60-1.50% of Mn, no more than 0.045% of P, no more than 0.045% of S, 0.0005-0.0035% of B, 0.011-0.022% of Ti, and the balance of Fe and impurity elements. The steel is applicable to production of the afterheat treatment steel bar which is smaller than or equal to phi 50mm; the performance indexes of the produced steel bar are achieved as follows: the yield strength ReL (Rp0.2) is greater than or equal to 600MPa, the yielding-to-tensile ratio Rm/ReL (Rp0.2) is greater than or equal to 1.15, and the total elongation rate Agt under the maximal stress is greater than or equal to 5.0%. The steel also can be used for producing the afterheat treatment steel bar of which the yield strength is 460-550MPa by reducing the cooling strength.