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339 results about "Gradual increase" patented technology

Gradual increase (adjective + noun) = a small, constant increase over a long period. NOTE: Gradual increase can also take a verb + adverb form. E.g.. "The share price increased gradually between 1992 and 1994". Next ยป.

CVD nanoporous silica low dielectric constant films

A method and apparatus for depositing nano-porous low dielectric constant films by reaction of a silicon hydride containing compound or mixture optionally having thermally labile organic groups with a peroxide compound on the surface of a substrate. The deposited silicon oxide based film is annealed to form dispersed microscopic voids that remain in a nano-porous silicon oxide based film having a foam structure. The nano-porous silicon oxide based films are useful for filling gaps between metal lines with or without liner or cap layers. The nano-porous silicon oxide based films may also be used as an intermetal dielectric layer for fabricating dual damascene structures. Preferred nano-porous silicon oxide based films are produced by reaction of 1,3,5-trisilanacyclohexane, bis(formyloxysilano)methane, or bis(glyoxylylsilano)methane and hydrogen peroxide followed by a cure / anneal that includes a gradual increase in temperature.
Owner:APPLIED MATERIALS INC

System and method for multi-channel RF energy delivery with coagulum reduction

A system and method for efficient delivery of radio frequency (RF) energy includes a backplane. At least a single channel card is removably coupled to the backplane for controlling the amount of RF power delivered through a single channel via an electrical coupling to at least one ablation electrode or a catheter. The at least one channel card provides a gradual increase in RF power calculated in real-time during an initial ramp-up phase, and to limit the delivery of RF power through the electrical coupling based on a received temperature of cardiac tissue in contact with the at least one ablation electrode, thereby reducing the likelihood coagulum formation.
Owner:SICHUAN JINJIANG ELECTRONIC MEDICAL DEVICE TECH CO LTD

Method for data collection and OD (Origin-Destination) analysis of public transport passenger flow based on WIFI identity recognition

The invention provides a method for the data collection and the OD (Origin-Destination) analysis of public transport passenger flow data based on WIFI (Wireless Fidelity) identity recognition. The method comprises the following steps: arranging an AP (Access Point) hot spot on a bus, reading the MAC (Media Access Control) addresses of WIFI equipment which are held by passengers, utilizing the MAC addresses to recognize the identities of the passengers, and storing the MAC addresses in a MAC address list in an AP; obtaining the total number of the WIFI passengers getting on / off the bus and the WIFI passengers on a cross section through the statistics of the MAC addresses in the list, and obtaining the total number of the passengers getting on / off each station and the total number of the passengers on the bus after the bus is driven away from the station through mathematic operation; establishing a detailed information database of the passengers taking the bus, storing data in a data table, and obtaining an OD matrix between all bus stations in the whole city through the query and the analysis of the data table. The real-time statistics and OD analysis of the passenger flow are combined, and the results are more real. The accuracy rate becomes increasingly higher. With the gradual increase of the popularization rate of intelligent mobile phones, the accuracy rate of the system is also gradually increased.
Owner:NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP

Turbine airfoil with continuous curved diffusion film holes

InactiveUS7887294B1Improvement in film cooling effectiveness for film coolingPromote accumulationEngine manufactureEngine fuctionsEllipseGradual increase
A turbine airfoil with a plurality of film cooling holes having a diffuser having both stream-wise and spanwise expansion of the cooling air flow. The diffuser is formed from a series of ellipses with a gradual increase in the cross sectional areas in the flow direction. The diffuser has a stream-wise surface of continuous curvature of about 7 degrees, and both the spanwise outward surface and the spanwise inward surface has a continuous curvature of about 7 degrees. The upstream side surface of the diffuser is formed substantially along a straight line. The ellipse shaped diffuser has spanwise and stream-wise curved surfaces such that at the hole opening onto the airfoil wall, the hole has an elliptical cross sectional shape with the major axis in the spanwise direction of the airfoil.
Owner:FLORIDA TURBINE TECH

Energy absorbers, connectors and horizontal lifeline systems

An energy absorber including a strap including at least a first path of relatively reduced strength extending over at least a portion of the length of the strap. The energy absorber also includes at least a first transition region including a first initial point where tearing begins along the first transition region when a force above a threshold force is applied (to the energy absorber / strap) and a first end point. The first end point is in operative connection with a first point on the first path so that tearing continues along the first path after tearing along the first transition region. A gradual increase in load occurring as tearing occurs along the transition region.
Owner:HONEYWELL INT INC

Insufflation of body cavities

An apparatus for use in insufflation of a body cavity 5, such as through a trocar 6 is described. One such application is laparoscopic surgery. The device is also suitable for use in any situation involving insufflation of a body cavity such as in arthroscopies, pleural cavity insufflation (for example during thoracoscopy), retroperitoneal insufflations (for example retroperitoneoscopy), during hernia repair, during mediastinoscopy and any other such procedure involving insufflation. The apparatus comprises a reservoir 1 for storing an liquid solution, an aerosol generator 2 for aerosolising the solution, and a controller 3 for controlling operation of the aerosol generator 2. Aerosolised liquid solution (which main contain a pharmaceutical) is entrained with insufflation gas using a T-piece connector or housing 30 having an insufflation gas inlet 31 and an outlet 32. The connector 30 also comprises an aerosol supply conduit 34 for delivering the aerosol from the aerosol generator 2 into a mixing chamber 33 in which the aerosol is entrained with insufflation gas. The aerosol insufflation gas mixture passes out of the connector 30 through the outlet 32 and is delivered along the insufflation gas conduit 15 to the trocar 6 for delivery into a body cavity 5. The connector 30 causes a substantial sudden reduction in the velocity of the insufflation gas from the insufflation gas inlet as it enters the mixing chamber 33. The connector 30 also causes a gradual increase in the velocity of the insufflation gas with entrained aerosol between the mixing chamber 33 and the outlet 32.
Owner:AEROSURGICAL

Power output apparatus, motor vehicle equipped with power output apparatus, and control method of power output apparatus

In the vehicle of the invention, when the temperature of an inverter 42 for driving a motor MG2 linked to front wheels 62a and 62b reaches or exceeds a preset restriction start temperature, the drive control of the invention controls the inverters 42 and 43 to gradually decrease the output torque of the motor MG2 simultaneously with a gradual increase in output torque of a motor MG3, which is linked to rear wheels 64a and 64b. Such torque control ensures output of a torque demand required for the vehicle. When the temperature of the inverter 42 reaches or exceeds a preset frequency switchover temperature, which is higher than the restriction start temperature, the drive control of the invention controls the inverters 42 and 43 to lower a switching frequency of transistors T1 to T6 in the inverter 42 and to ensure output of the torque demand. Such drive control effectively relieves the load of the inverter 42, while decreasing the frequency of lowering the switching frequency of the inverter 42. This arrangement thus desirably attains both prevention of overheat of the inverter 42 and reduces the switching noise.
Owner:TOYOTA JIDOSHA KK +1

Intelligent rewinding machine

InactiveCN102107800AOvercome the non-parallelismClamp firmlyFilament handlingYarnConstant linear velocity
The invention discloses an intelligent rewinding machine with constant linear velocity, constant tension and fixed wire length, comprising a linear velocity sensor, a tension automatic controller and a single spindle transmission control device, wherein a transmission cone table is directly fixed on an output shaft of a motor; a movable cone table is movably connected with a handle via a pin; the linear velocity sensor has the functions of detecting broken lines, linear velocity and length counting. When a tension detecting hook on the tension automatic controller detects that the tension of yarns is oversize, a swinging arm is controlled to rotate an angle so as to reduce the yarn bending degree of the flowing yarns and reduce the winding tension of the yarns, and vice versa. A computer controller on the single spindle transmission control device receives signals sent by the linear velocity sensor and controls the rotation speed and the broken lines of the motor to warn. As the gradual increasing winding diameter of the tube, the rotation speed of the tube is controlled to gradually slow, so that the winding linear velocity is constant; when the length of the yarns reaches the set value or the broken line signal is received, the power supply of the motor is cut off and the warning light twinkles.
Owner:ๅนณๅ›ฝๆฐ‘

Systems and methods for backlight driving

Various systems and methods for LCD backlight control are disclosed herein. For example, some embodiments of the present invention provide an LCD backlight circuit with an analog inverter circuit that provides a drive voltage to a lamp. A current traversing the lamp is sensed and provided to a digital control circuit. Based on the sensed current, the digital control circuit generates a control signal that is fed back to the analog inverter circuit. In some cases, the digital control circuit is used to cause a gradual increase in voltage applied to the lamp to achieve ignition of the lamp. In other cases, the digital control is used to provide a pre-distorted sine wave that attenuates one or more harmonics introduced into the system by the non-linearities of the lamp.
Owner:TEXAS INSTR INC

Sigma-delta fractional-N PLL with reduced frequency error

A sigma-delta fractional-N phase locked loop has faster lock time with increased charge pump current and decreased loop filter resistance in the unlock state. On the other hand, the sigma-delta fractional-N phase locked loop has lower noise susceptibility and lower frequency error with gradual decrease in charge pump current and gradual increase in loop filter resistance, in the lock state.
Owner:SAMSUNG ELECTRONICS CO LTD

Device and methods for controlling blood perfusion pressure using a retrograde cannula

Devices and methods are disclosed for the control of blood perfusion pressure within a blood vessel that undergoes arterialization. A cannula is introduced that contains a stenosis that either resorbs or is removed in time, allowing a gradual increase in blood pressure between two blood passages connected at either ends of the cannula. Particular emphasis has been made with the use of the cannula for the vessels in the heart.
Owner:CVDEVICES

Method and system for managing baseband resource pool of global mobile communication system

The invention provides a management method for a GSM system baseband resource pool and a system thereof. The core of the management method is that baseband resources are distributed dynamically according to the calls of a user, namely just BCCH baseband resources are distributed in advance at communities before the baseband resources are distributed dynamically one by one based on the unit of the carrier frequency with the initiation of the calls of the communities and the gradual increase of the services, and the baseband resources are released one by one based on the unit of carrier frequency with the gradual reduction of the services of the communities; the baseband resources can be distributed in advance according to the average traffic in order to prevent high traffic from causing the flow of the signals initially distributed dynamically to grow quickly; the mutual backing-up of GBP single boards can be formed, the disaster recovery capability of the GBP single boards is improved and the baseband resources are optimized in combination with the advantages of the static distribution and dynamic distribution.
Owner:ZTE CORP

Pneumatic tire

Provided is a pneumatic tire having snow performances which are capable of being enhanced without sacrificing its running performance on dry road surfaces. A pneumatic tire of the invention includes two first main grooves, a plurality lateral grooves and a plurality of sipes in a tread part. In the pneumatic tire, a groove wall surface, of each first main groove, closer to a tire equatorial line is formed so as to cyclically repeat, in the tire circumferential direction, a change in an inclination angle of the groove wall surface to a direction normal to a tread, the change being a gradual increase from a minimum value of 0ยฐ to 15ยฐ to a maximum value of 15ยฐ to 45ยฐ. In places where the inclination angel of the groove wall surface, of the first main groove, closer to the tire equatorial line, is at its maximum, no lateral grooves communicate with the first main groove, and in the places, the other groove wall surface, of the first main groove, closer to a corresponding contact end extends uninterruptedly.
Owner:YOKOHAMA RUBBER CO LTD

Mixed type passive optical network structure and method for positioning and restoring faults thereof

The invention discloses a mixed type passive optical network and a method for positioning and restoring faults thereof. The passive optical network comprises an optical line terminal, optical network units divided into a plurality of optical network unit groups and a far-end node, wherein the optical line terminal is connected with the far-end node through two feeder optical fibers; the far-end node is connected with the optical network unit groups by adopting a dual-fiber star topology structure; the optical network units which needs to be protected in the groups are connected to each optical network unit group by adopting a dual-fiber tree or cross-bus structure. In the mixed type passive optical network structure, the mixed TDM / WDM technology is adopted to improve the access scalability of a network effectively and provide the convenience for the gradual increase of the number of network bandwidth and network users. The fault positioning of the network provided by the invention can be realized by a statistical analysis method, the flexible restoration of the network faults can be realized through the action of the optical line terminal and the survival rate of the network is improved.
Owner:SOUTHEAST UNIV

Sintered ring cold exhaust heat stepped recovery power generation system and technique

A sintering circulating cooling waste heat cascade recovery power generation system and a process thereof belong to the sintering waste heat utilization technology field. The system comprises a sintering circulating cooling machine, a windward chamber, a leeward chamber, a heat exchanger, a fan, a waste heat boiler, a steam bag, a superheater, an evaporator, an oxygen remover, a steam turbine, a generator, a condenser, a condensate pump and a water supply pump. The totally closed system is adopted to carry out subsection cooling and cascade recovery of waste heat of sinter, thereby recovering the sensible heat of the sinter to the maximum extent; the gradual increase of the temperature of cooling air can reduce the heat exchange temperature difference with the sinter; in order to not affect the cooling effect of the sinter, the system adopts the combined mode of the sub-cycle of the cooling air and the major cycle to absorb the sensible heat of the sinter, thereby improving the waste heat recovery efficiency. Compared with the prior art, the system and the process can extremely recover the waste heat of the sinter, improve the temperature of steam which is used for power generation under the premise of not increasing the total circulating air volume, increase the waste heat power generation amount and have great economic effects.
Owner:SHOUGANG CORPORATION +1

Mechanical CPR device with variable resuscitation protocol

Methods to control the delivery of CPR to a patient through a mechanical CPR device are described. The method generally allows for a gradual increase in the frequency of CPR cycles. The gradual increase can be regulated by protocols programmed within the CPR device such as intermittently starting and stopping the delivery of CPR, accelerating the delivery of CPR, stepping up the CPR frequency, increasing the force of CPR, and adjusting the ratio of compression and decompression in a CPR cycle. Combinations of each of these forms may also be used to control the delivery of CPR. This manner of gradually accelerating artificial blood flow during the first minutes of mechanical CPR delivery can serve to lessen the potential for ischemia / reperfusion injury in the patient who receives mechanical CPR treatment.
Owner:PHYSIO CONTROL INC

Method and device for visual examination

A method and device allows to instantly determine the critical fusion frequency of a person without changing the routine viewing and lighting conditions. For a personal computer user, a window with running stripes or a blinking dot is projected onto a video monitor over an existing application. Gradual increase of the blinking frequency until the fusion of the test object is used in determining the critical fusion frequency. Provisions are made to adjust individually such parameters as a distance from the monitor, brightness, contrast, color and surrounding lighting which leads to improved vision and increased critical fusion frequency as can be verified by the same method and device once adjustment is complete. In a second embodiment, a series of dots, each blinking with an individual frequency is presented to the person to choose the one appearing non-blinking with the lowest blinking frequency thus defining the critical fusion frequency.
Owner:TRESKOV YAKOV +1

Clustering method for building laser scan point cloud data

The invention discloses a clustering method for building laser scan point cloud data. The method comprises the following steps: converting the point cloud data into two-dimensional data to acquire a set X; appointing density threshold value MinPts; calculating the longest distance of MinPts objects with shortest distance from the point towards any point in the X; counting maximal and minimum value of the longest distance of all the points; classifying the difference value of the maximal and minimum value of the longest distance into n equal portions; making a circle by adopting the point generating the minimum value of the longest distance as the center and the gradual increasing value of the distance of the equal portions as the radius; calculating the number of points in each circle; adopting the difference value as a abscissa; adopting the numbers of the points in each circle as an ordinate; conducting fitting to form a curve; seeking points of inflexion of the curve; taking the number value of the abscissa corresponding to the points of inflexion as the value of sigma; building AQ-DBSCAN algorithm by adopting the MInPts and the sigma as conditions; conducting clustering on the points in the X to obtain the belonged cluster analysis of the points in the point cloud in the parts of the building.
Owner:BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE

Alignment film precuring equipment

The invention discloses an orientation membrane pre-curing equipment, comprising a workbench and a heater arranged above the workbench; the heater is an infrared generating device which comprises a plurality of quartz glass far infrared ray heating tubes; wherein, a moving device is connected below the workbench and can drive the workbench to move up and down relative to the heater. The invention arranges the heating device on the upper part of the equipment and uses the infrared generating device to generate infrared so as to achieve panel heating to a substrate which has no contact with the heating device; the substrate has an air layer in the middle and can be evenly heated; besides, the workbench can move up and down; when the heating starts, the workbench has a longer distance from the infrared generating device on the upper part of the equipment, so the substrate is heated by less heat; during the heating process, the workbench automatically rises and is more and more close to the infrared generating device on the upper part of the equipment, so the substrate is heated by more and more heat so as to achieve a gradual increase in heating temperature to reduce the rate of unqualified products caused by uneven heating and improve the product yield.
Owner:K TRONICS (SUZHOU) TECH CO LTD +1

Compressed-air energy-storing power generation system adopting unsteady state compression process

The invention discloses a compressed-air energy-storing power generation system adopting an unsteady state compression process. The compressed-air energy-storing power generation system adopting the unsteady state compression process comprises a compressor unit, an air storage device, a turbine generator unit and a heat recovery system, wherein an outlet of the compressor unit is connected with an inlet of the air storage device, and the compressor unit provides compressed air for the air storage device. When the compressor unit provides the compressed air for the air storage device, the pressure of the outlet of the compressor unit synchronously changes along with the pressure in the air storage device, the air storage device stores the compressed air of the compressor unit and provides the compressed air for the turbine generator unit, the heat recovery system feeds back compressed heat to air of the turbine side to improve the temperature of the air, and therefore work of the air can be improved. According to the compressed-air energy-storing power generation system adopting the unsteady state compression process, by means of achievement of synchronous change between the discharge pressure of the outlet of the compressor unit and the air-storing pressure, gradual increase of the power of the compressor unit can be achieved. Due to the unsteady state compression process, under the condition that the compressed air in the same situation is obtained, electric energy consumed by the compressor unit can be reduced, and the transferring efficiency of the electric energy of the system can be improved.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

An InGaN-based multi-quantum well structure and a method for preparing the same

The invention relates to an InGaN-based multi-quantum well structure. Multilayer structures in which In constituent gradual increase quantum well layers and Si-doped GaN barrier layers are arranged alternately are successively grown on a GaN barrier layer. Then, along a growth direction, multiplayer structures in which fixed-In-constituent quantum well layers, In constituent gradual decrease quantum well layers, and GaN barrier layers are arranged periodically are further grown. Therefore, the InGaN-based multi-quantum well structure may effectively alleviate stress at the interface between a barrier and a well and curving of an energy band, control a radiation recombination area of electrons and electron holes, increase the injection efficiency and the radiation recombination efficiency so as to be beneficial to further acquisition of a GaN-based LED structure with good crystal quality, high internal quantum efficiency, and high light-emitting efficiency. In addition, the light-emitting peak of the GaN-based LED structure has a low full width at half maximum and uniform wavelengths of emitted light.
Owner:TAIYUAN UNIV OF TECH

System and method for controlling toilet odors

A system and method for controlling toilet odors. A toilet seat having a tapered vent passage formed therein, for causing a gradual increase in flow velocity there through is coupled to a conduit, which is further coupled to a fan. The fan induces air flow through the vent passage and the conduit, thereby exhausting air away from the toilet. Low volume and air flow rates are employed to effectively and quietly remove objectionable odors from the toilet area during use. An inlet screen may be positioned over the inlet end of the vent passage. The fan power may be controlled with a seat-activated switch. The conduit may be a corrugated hose.
Owner:RODRIGUEZ CIRILO

Phase controller

In a phase controller used in a light control of an incandescent lamp, noise reduction, prevention of elements from damage due to short circuit current, downsizing and lower cost are purposed. A CPU circuit of a control circuit sets a gradual increase term during which a load voltage applied to the incandescent lamp is gradually increased by driving a self-quenching type switching device such as an IGBT. After passing the gradual increase term, a main switching device such as a TRIAC is turned on. The phase controller further comprises a current sensor such as a shunt resistor for sensing a value of the load current flowing through the self-quenching type switching device, according to need. The CPU circuit compares the sensed value of the load current with at least one reference value, and selects driving manner of the main switching device and the self-quenching type switching device corresponding to the result of comparison.
Owner:MATSUSHITA ELECTRIC WORKS LTD

Control system for controlling propeller aircraft engine during takeoff

ActiveUS20080029653A1Maximize thrustMinimize takeoff roll distancePropellersActuated automaticallyControl systemPropeller
A control system and method of controlling a propeller aircraft engine during takeoff limits the amount of engine power developed at the very beginning of the takeoff in order to maximize thrust and minimize rollout distances. The control system limits the amount of power developed by the engine, even in the face of a nominal demand by the pilot for maximum engine power. Instead, the control system provides something significantly less than full power at the beginning of takeoff and gradually increases the power developed by the engine to full power as the airspeed increases. This gradual increase from partial engine power toward full power helps prevent stalling of the propeller, thereby maximizing the effectiveness of the propeller and engine in assisting the aircraft to takeoff quickly. The control system is particularly helpful for taking off from high-altitude runways.
Owner:LOCKHEED MARTIN CORP

Method for quickly starting short-cut nitrification and denitrification of ammonia-containing wastewater

The invention discloses a method for quickly starting short-cut nitrification and denitrification of ammonia-containing wastewater. The method includes the steps: (1) putting denitrified activated sludge into a bioreactor; and (2) starting by a way of batch water feeding and gradual increase of the fed water ammonia-nitrogen concentration, and adding an ammonia oxidizing bacteria growth promoter, wherein the ammonia oxidizing bacteria growth accelerator includes 40 to 100 parts by weight of metal salts, 5 to 30 parts by weight of a polyamine substance, 0.05 to 1.5 parts by weight of inorganic acid hydroxylamine and 10 to 40 parts by weight of Na2SO3, the metal salts comprise a calcium salt, a ferrous salt and a copper salt, and the molar ratio of Ca<2+> to Fe<2+> to Cu<2+> is (5-15) to (1-8) to (0.5-5); and (3) when the fed water ammonia-nitrogen concentration reaches 400 to 700 mg / L, changing the mode into a mode of continuous water feeding, continuing to add the growth promoter, and when the ammonia-nitrogen removal rate is more than 90% and the nitrosation rate reaches 80%, starting to add a denitrification inoculum. The method can quickly start short-cut nitrification and denitrification process in a short time, and has the advantages of short starting time and high total nitrogen removal rate.
Owner:CHINA PETROLEUM & CHEM CORP +1

Cascade reservoir group optimized dispatching multi-core parallel computing design method based on Fork/Join framework

The invention discloses a cascade reservoir group optimized dispatching multi-core parallel computing design method based on a Fork / Join framework. The method includes the following steps that 1, the Fork / Join parallel framework is established; 2, the Fork / Join parallel framework is achieved; 3, typical intelligent method parallel design in a coarse-grained mode is carried out; 4, typical dynamic planning method parallel design in a fine-grained mode is carried out. By means of PSCWAGA, PAHPSO, PDP and PDDDP method instance testing results, the Fork / Join multi-core parallel framework is adopted, the multi-core CPU parallel performance can be fully exerted, calculation time is greatly shortened, the calculation efficiency of the algorithm is remarkably improved, and the larger the calculation scale of the parallel method is, the shorter the calculation time is, and the more obvious the advantages of parallel calculation is. Along with gradual increase of the calculation scale, the speed-up ratio is gradually increased, the parallel efficiency is gradually improved, and the speed-up ratio is closer to an ideal speed-up ratio.
Owner:PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION

High-density fermentation method of engineering bacteria containing nitrilase

InactiveCN104212785APrevention of waste and other disadvantagesControl growth rateHydrolasesMicroorganism based processesEscherichia coliHigh concentration
The invention discloses a high-density fermentation method of engineering bacteria containing nitrilase. The method adopts a novel recombinant Escherichia coli fermentation and supplementary material culture medium formula, and uses a method of DO-STAT coupling step-by-step induction and gradual increase of the speed stage by stage. The method not only meets the need for mixing power in the culture process with biomass increase, effectively controls the growth rate of thalli, and prevents disadvantages of produced acid accumulation caused by fast growth of thalli, feedback inhibition and culture medium waste. In addition, the induced mode of batch-by-batch lactose supplement addition avoids the high viscosity of the fermentation broth caused by high concentration of lactose, resulting in resistance of oxygen transfer and mass transfer, but also improves the induction strength. The high-density fermentation technology of the invention increase the biomass of recombinant Escherichia coli from 10.35g DCW / L to 70g DCW / L, volume enzyme activity from 18205U / L to 103530U / L, and the fermentation level by 4.7 times.
Owner:ZHEJIANG UNIV OF TECH
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