48results about How to "Improve batch consistency" patented technology

The invention discloses a high-linearity broadband stacking low noise amplifier based on a gain compensation technology. The high-linearity broadband stacking low noise amplifier comprises a two-stacking low noise amplification network, an interstage matching network and a two-stacking gain expansion amplification network which are connected in sequence; and a first power supply bias network and a second power supply bias network which are connected with the two-stacking low noise amplification network and the two-stacking gain expansion amplification network. According to the high-linearity broadband stacking low noise amplifier, a serial stacking structure is realized through adoption of two transistors with different sizes and ultra wide band noise and impedance matching are realized through combination of an RLC feedback network; through utilization of the gain compression compensation technology, the gain compression property of the two-stacking low noise amplification network is cancelled within a certain bias range through the two-stacking gain expansion amplification network and a linearity index of the amplifier is improved, so the whole low noise amplifier has good broadband, linearity, low power consumption and low noise amplification capability; and moreover, the low breakdown voltage property of an integrated circuit technology is avoided and the stability and reliability of a circuit are improved.

The invention discloses a method for hard carbon negative electrode materials of a lithium ion battery and belongs to the technical field of hard carbon negative electrode materials of the lithium ion battery. By means of the method, one or several kinds with any proportion of sulfuric acid, sulfate, boric acid, borate, phosphoric acid, phosphate, muriatic acid, muriate and ammonia or ammonium salt is/are chosen as a catalyst/catalysts for preparing the hard carbon negative electrode materials of the lithium ion battery in a catalysis method, and compared with the catalysts used in the prior art, the catalysts used in the preparing process of the materials are reduced in low-temperature section stabilized heat treatment temperature, the time is shortened by nearly 10 times, a large number of resources are saved, production cost is reduced, and capacity is improved.

The invention discloses an automatic accurate adjustment system for an instrument movement clearance. The automatic accurate adjustment system comprises a work table, a handpiece module, an engine base module, a shifting module, a laser displacement sensor module and a controller. The handpiece module comprises a cutter head and a cutter head drive mechanism; the shifting module comprises a shifting plate and a shifting plate drive mechanism; the laser displacement sensor module comprises a probe, a laser displacement sensor and a probe drive mechanism; the signal output end of the laser displacement sensor is connected with the controller; and the control ends of drive elements in the cutter head drive mechanism, the shifting plate drive mechanism and the probe drive mechanism are connected with the controller. A clearance between a lower bearing and a shaft tip in a measurement mechanism of an electrical measuring instrument to be adjusted is detected by using the shifting plate, the probe and the laser displacement sensor, an adjustment quantity is output by using the controller according to a detection signal, and axial displacement is generated by driving the lower bearing through the cutter head, so that the accurate adjustment of the clearance between the lower bearing and the shaft tip is realized. The automatic accurate adjustment system is short in machining period, low in cost and high in efficiency; and moreover, the batch uniformity and the stability of the accuracy can be improved.

The invention provides a control method and system for the outlet moisture content of a cut tobacco drying procedure, and the method comprises the steps: setting the temperature of a cylinder wall, the temperature of hot air and the moisture removal air volume in the cut tobacco drying procedure according to set parameter values, and setting the target value of the outlet moisture content of the cut tobacco drying procedure; obtaining an actual measurement value of the outlet moisture content of the cut tobacco drying process, and obtaining a target deviation value of the outlet moisture content according to the target value and the actual measurement value; and establishing a PID feedback control model for adjusting the hot air speed according to the target deviation value so as to perform feedback control on the outlet moisture content, so that the outlet moisture content of the outlet material of the cut tobacco drying process in the batch is controlled according to the target value. The batch consistency of the cut tobacco drying outlet moisture content can be improved, and the quality control capacity in the production process is improved.

The invention relates to a hydrogen flame ionization detector and working method thereof. The hydrogen flame ionization detector comprises an outer cover, a chromatographic column, a collector, a polarization electrode, a conductive nozzle and a detection circuit. The collector is connected with the detection circuit after being connected with a polarization power source in series. The collector is connected with the negative pole of the polarization power source. The conductive nozzle is a ground potential. According to the hydrogen flame ionization detector, polarization voltage is connected to a signal outgoing line of the collector in series, meanwhile, the traditional polarization electrode and the nozzle are combined into a whole, the ground potential is kept, the normal function of the detector is ensured, and the equipment complexity and production technology are simplified.

The invention discloses a MEMS closed-loop accelerometer based on rigidity compensation. The MEMS closed-loop accelerometer based on rigidity compensation comprises an upper half part and a lower halfpart which are centrosymmetric along the accelerometer, each of the upper half part and the lower half part comprises a substrate, an anchor point is fixed on each substrate, an insulating layer is arranged on each substrate, each insulating layer is provided with a sensitive device layer, and each sensitive device layer comprises a sensitive mass block, a supporting beam, a force feedback comb tooth unit, a detection comb tooth unit and a rigidity compensation unit; the sensitive mass block of each of the upper half part and the lower half part is provided with a first hollowed-out area anda second hollowed-out area; a supporting beam anchor point, a supporting beam, a detection comb tooth unit anchor point and a detection comb tooth unit are mounted in each first hollowed-out area; a supporting beam anchor point, a supporting beam, a force feedback comb tooth unit, a force feedback comb tooth unit anchor point, a rigidity compensation unit and a rigidity compensation unit anchor point are mounted in each second hollowed-out area; and by the design of a rigidity compensation structure of the accelerometer, the problem of large mechanical rigidity due to processing of a technology can be solved.

The invention relates to a dual-frequency antenna comprising a feed unit, a transmission line and a radiation arm unit which are electrically connected in sequence. The radiation arm unit comprises an internal radiation unit including a first and second high frequency radiation arm, an external radiation unit including a first and second low frequency radiation arm, and two isolation elements arranged between the internal and external radiation unit. One end of the internal radiation unit is connected with the transmission line, and the other end of the internal radiation unit is electrically connected with the external radiation unit through the isolation elements. Each isolation element has a parallel double-line structure with one end open-circuited or short-circuited, and two conductors forming the other end of the parallel double-line of the isolation element are respectively connected with a corresponding high frequency radiation arm and low frequency radiation arm. The dual-frequency antenna realizes high accuracy in transmission and batch consistency in production, improves the defects of an existing technical scheme, and has an advantage of small size.

The invention belongs to the field of high-performance fibers, and particularly relates to a preparation method of poly(p-phenylene benzobisoxazole) fibers. The preparation method comprises the following steps of taking frozen polyphosphoric acid powder, phosphorus pentoxide, 4,6-diaminoresorcinol hydrochloride and terephthalic acid as raw materials, putting the phosphorus pentoxide into a reaction system step by step in a reasonable proportion in a proper time period, and detecting and regulating the apparent viscosity of the materials in real time in a prepolymerization process to ensure that a prepolymer with uniform apparent viscosity is obtained; performing post-polymerization to obtain PBO spinning slurry; and performing dry-jet wet spinning and post-spinning to obtain the finished PBO fibers. The method overcomes the defects that traditional solid raw materials are poor in solvent mixing and dispersing effect, easy to agglomerate and incapable of uniformly reacting, ensures the consistency of a prepolymerization reaction end point, and reduces the process errors. The intrinsic viscosity of the polymer in the same batch in different time periods is small in change and high, the mechanical property of the fibers can be obviously improved, and the quality stability is also improved.

The invention provides a quality control method and system based on airflow type cut stem drying. The method comprises the steps: acquiring a hot air temperature target value and an outlet moisture content target value in a cut stem drying procedure; establishing a temperature feedback control model of a hot air temperature and a steam valve opening degree, and controlling the steam valve openingdegree according to the temperature feedback control model and the hot air temperature target value so as to control the hot air temperature in a drying machine; acquiring an actual measurement valueof the outlet moisture content of the cut stem drying process, and obtaining a target deviation value of the outlet moisture content according to the target value and the actual measurement value; andestablishing a moisture content PID feedback control model for adjusting the air speed of the hot air according to the target deviation value so as to perform feedback control on the outlet moisturecontent so as to control the outlet moisture content of the outlet material in the cut stem drying process in the batch according to the target value. The batch consistency of the cut stem drying outlet moisture content can be improved, and the quality control capacity in the production process is improved.

The invention discloses a method for preparing instant tea through quantificationally matching, which is characterized in that: after a variety of tealeaf ingredient enrichments are obtained by separating and extracting tealeaf raw materials, tealeaves of a target variety are selected as samples, the samples are extracted according to the same separation and extraction technique to determine the content ratio of each ingredient in the sample tealeaves, and the tealeaf ingredient enrichments are matched according to the content ratio, so the instant tea having the characteristics correspondingto that of the target variety. The instant tea with different flavors can be matched and prepared through the method, and the quality and the sensory evaluation of the instant tea can be remarkably improved, so the quality of the prepared instant tea is united, and the problem that the quality is different can be solved.

The invention discloses a doped optical fiber preformed rod and a preparation method thereof. The preformed rod comprises a doped core layer, a first quartz cladding layer and a second quartz cladding layer from inside to out; the numerical aperture of the second quartz cladding layer relative to the first quartz cladding layer ranges from 0.1 to 0.24; the section of the second quartz cladding layer is round. The doped optical fiber preformed rod is prepared according to the following method: (1) wrapping the doped core layer with the first quartz cladding layer material, stretching until the section area ratio is matched with the section area ratio of the second quartz cladding layer, and processing the section into predetermined appearance to obtain a preformed rod semi-finished product; (2) wrapping the preformed rod semi-finished product with the second quartz cladding layer material and processing the section into round to obtain the doped optical fiber preformed rod. The optical fiber preformed rod provided by the invention facilitates wire-drawing forming and pump light leakage is greatly reduced; according to the preparation method, the geometric concentricity of the preformed rod can be guaranteed and the consistency of the optical fiber production batches is improved.

The invention discloses a processing device and method for a high-precision inductor. The method comprises the following steps: 1, winding a copper coil (1); 2, assembling the copper coil well wound in the step 1 with casings (2); 3, winding a magnetic core in the casings (2). Winding of a magnetic strip is controlled through a rotatable part in the casings (2), so that the rotatable part is matched with inductance measurement equipment, connected with the copper coil (1), to measure the inductance value, when the inductance value meets the requirement, the rotatable part is stopped, and production of the inductor is finished. Electrical parameters of the inductor have high consistency, meanwhile, use of an inductor with a large wire diameter is not dependent on manual operation any more, and the production efficiency and the product quality are improved greatly.

According to the tool for preparing the composite material test sample piece and the preparation method of the test sample piece, the special tool is designed to fix a three-interlayer composite structure sample material blank composed of a reinforcing plate, a limiting plate and a to-be-tested composite material plate, and it is ensured that the reinforcing plate and the to-be-tested composite material plate do not have relative displacement in the cementing and curing process; the bonding reliability is improved by adopting a high-temperature-resistant epoxy glue bonding and curing method, and then test samples with corresponding sizes are obtained by machining and cutting according to size requirements. The tool is adopted to assist high-temperature-resistant epoxy glue to perform in-situ cementing of the reinforcing plate/to-be-tested composite plate, then the composite material test sample piece is prepared by a machining method, it is ensured that no relative displacement exists in the resin glue curing process, the batch consistency of the sample piece is improved, the reinforcing plate is reliably cemented, The tool can effectively solve the problem of test failure caused by debonding and abnormal damage of the reinforcing sheet when a sample prepared by a conventional method is tested under harsh environmental conditions such as high temperature and damp heat, and meanwhile, the preparation efficiency of the sample is greatly improved.

A line voltage detection circuit for a switching power supply comprises a line voltage input end used for inputting a line voltage, an input resistor, a voltage regulator module and a current sampling module, wherein the input resistor, the voltage regulator module and the current sampling module are connected in sequence; one end of the input resistor is connected with the line voltage input end, and the other end of the input resistor is connected with the voltage regulator module; the voltage regulator module comprises a first output end used for outputting a regulating voltage, a second output end used for outputting a regulating current, and an input end used for outputting a reference voltage, and the voltage regulator module controls the regulating voltage and outputs the regulating current to the current sampling module; an input end of the current sampling module is connected with the second output end of the voltage regulator module and used for receiving the regulating voltage, and an output end of the voltage regulator module is used for outputting a detection current proportional to the regulating current. By means of the line voltage detection circuit for the switching power supply, the ratio of a detection output value and a line voltage input value can be set according to a resistance value inputted to the resistor.

The invention discloses standard quantitative-matching instant green tea and a preparation method thereof. The instant green tea comprises 62 to 68 percent of tea polyphenol enrichment, 5 to 7 percent of caffeine enrichment, 22 to 26 percent of tea polysaccharide enrichment and 10 to 15 percent of other beneficial ingredients. By determining the quantity of beneficial ingredients in excellent green tea after the beneficial ingredients are separated and extracted, the proportional situation of ingredients in the excellent green tea can be obtained, and then an ordinary tealeaf raw material is separated and extracted according to the same way and is quantificationally matched according to the proportion so as to obtain the instant green tea having similar characteristics to the excellent green tea. Through the method, the ordinary green tealeaves can be prepared into the instant green tea having characteristics which are similar to that of the excellent green tea through a quantitative matching way, so the production cost can be reduced, and a high economic and practical value can be realized. The instant green tea has the advantages of standardization, fixed ingredients, low residue of heavy metal and farm chemicals and the like. The preparation method of the instant green tea is easy to realize the industrialized mass production.

The invention discloses a zero position correction-based MEMS accelerometer. The zero position correction-based MEMS accelerometer comprises a substrate; an oxide layer is arranged on the substrate; aplurality of anchor points are fixed on the substrate through an oxide layer; a sensitive device layer is arranged on the oxide layer; the sensitive device layer comprises a differential capacitancedetection structure, an accelerometer closed-loop feedback electrode structure, a plurality of cantilever beams, a zero position correction structure, a sensitive mass block, two stopping structures and two fixing structures; the structure of the accelerometer is properly designed, so that the problem of the inconsistency of the change of the zero position output of the structure of the accelerometer caused by machining error, installation error, environment temperature and the like can be solved, and the influence of zero position change on performance such as device stability, temperature characteristics and the like is eliminated.

The invention relates to the technical field of wireless communication base station antennas, and provides a radiation unit and an array antenna. The radiation unit includes a first dielectric substrate and a second dielectric substrate. A first support column is arranged between the two dielectric substrates. The lower surface of the second dielectric substrate is connected with a second supportcolumn. A guide sheet is attached to the upper surface of the first dielectric substrate, and a radiation sheet is attached to the upper surface of the second dielectric substrate. Feeding circuits are arranged on the lower surface of the second dielectric substrate, and the feeding circuits extend along the second support column to a welding part connected with the second support column. The first dielectric substrate, the first support column, the second dielectric substrate, the second support column and the welding part are integrally formed. The integrally formed radiation unit in the form of a double-layer micro-strip patch has a height of less than 0.18lambda and good low profile characteristic. The height and weight of the radiation unit are reduced, and the reliability and batch consistency of the radiation unit are improved. The radiation unit is suitable for large-scale manufacturing and has an excellent lightweight effect.

A method of extracting volatile oil active components from zedoray rhizome is provided. The method includes subjecting zedoray rhizome dry tubers which are adopted as raw materials to ultrafine grinding, stirring and extracting with ethyl acetate, filtering to obtain a supernatant liquid, concentrating and drying in a rotary evaporator to obtain a crude extract product, dissolving the crude extract product into an n-hexane-ethanol binary solvent system, and separating through high performance preparative liquid chromatography by adopting a normal-phase silica gel axially-pressurized chromatographic column, wherein a binary mobile phase adopting n-hexane as an A phase and adopting methanol as a B phase is adopted, gradient elution is performed for 30 min with the concentration of the ethanol that is the B phase changing from 0 to 50%, eluate from the 15.5 min to the 17 min is collected according to an ultraviolet absorption spectrum, adopted as target components, and subjected to rotary evaporation until a product is dry, and the product is the target volatile oil active components. The method adopts the zedoray rhizome dry tubers as the raw materials, and is high in extracting efficiency, rapid and simple in preparing process and capable of popularization and large-scale production. The obtained volatile oil active components can be used for preparing anti-liver-cancer medicines.

The invention provides an extraction method of a genistein monomer compound in Armillarialuteo-virens. The method includes: taking an Armillarialuteo-virens fruit body as the raw material, grinding the raw material into powder, then conducting extraction with ethyl acetate, and carrying out concentration into paste; conducting dissolving with a n-hexane-ethanol solvent; conducting one-dimensional liquid chromatography separation: employing a Silica chromatographic column, adopting a binary mobile phase with n-hexane as the phase A and ethanol as the phase B, performing gradient elution with phase B at a concentration ranging from 0% to 75%, and collecting the 26-29min eluent; performing dissolving with an ethanol-n-hexane solvent; carrying out two-dimensional liquid chromatography separation: adopting a Silica chromatographic column, employing a binary mobile phase with n-hexane as the phase A and ethanol as the phase B, performing isocratic elution with phase B at a concentration of 2%, collecting the 8-11min eluent, and performing evaporation concentration to obtain genistein. The separation method has the advantages of stability, high repeatability, large preparation capacity, simple operation and time saving, low cost, and high genistein extraction rate. The target object has an inhibiting effect on lung cancer A549 cells and liver cancer Hep-G2 cells, and has anticancer drug development potential.