22 results about "Linearity" patented technology

Systems and methods enabling search of a repository for the location of data that is similar to input data, using a defined measure of similarity, in a time that is independent of the size of the repository and linear in a size of the input data, and a space that is proportional to a small fraction of the size of the repository. Additionally, remote operations are accomplished with significantly reduced system bandwidth by implementing remote differencing operations.

The invention discloses a sensor for monitoring metal abrasive particles in oil liquid on line. The sensor is a mutual inductance sensor and comprises an exciting coil and an inducting coil, wherein an oil path through which the oil liquid can pass is arranged in the center of a framework made of a magnetic inert material; the exciting coil and the inducting coil are coaxially wound on the framework; the inducing coil is positioned between the exciting coil and the framework; the axial length of the inducting coil is 1/4-1/2 of that of the exciting coil; and the axial center points of the inducting coil and the exciting coil are superposed. The sensor realizes zero compensation and adjustment by adopting a parallel measurement structure and is simple in structure, high in sensitivity, high in linearity and high in interference resistance. The sensor applied to on-line monitoring for the metal abrasive particles in the oil liquid is convenient to operate, high in instantaneity, high in measurement precision and accurate and reliable in monitored result and can be widely applied to military and civil fields and used for monitoring the pollution degree and the abrasion to the oil liquid of lubricating systems of mechanical equipment such as various air planes, naval vessels and automobiles and monitoring and diagnosing faults of the lubricating systems of the mechanical equipment to avoid safety accidents.

The invention discloses a method for rapid determination of the content of selenium in a soil sample. According to the invention, hydride generation-atomic fluorescence spectroscopy and a standard curve method are utilized; mixed acid is used, the mixed acid has powerful oxidation capability and does not need cold digestion or stay overnight, and hot digestion time can be shortened at a certain temperature, thereby substantially shortening a detection period. A standard curve can be directly prepared by using a national selenium standard solution, operation is simple, accuracy is high, and a good linear relation is obtained. Since atomic fluorescence spectroscopy has the characteristic of strong anti-interference capability, potassium ferricyanide has a weak effect on shielding interference of other elements and almost exerts no influence on detection results, so it is of no need to use the reagent of potassium ferricyanide, thereby reducing usage amount of reagents and enabling steps of the method to be simpler and operation to be easier.

The invention discloses a sampling hold circuit which comprises a clock generation sub-circuit, a grid voltage bootstrap unit and a sampling hold sub-circuit, wherein the clock generation sub-circuit is provided with a first output end and a second output end, the first output end and the second output end are both connected with the grid voltage bootstrap unit, the sampling hold sub-circuit comprises a sampling switch and a holding capacitor, and the grid voltage bootstrap unit is further connected with an external power supply and the sampling switch. The sampling hold circuit further comprises a leak-proof sub-circuit which is connected between a bootstrap capacitor of the grid voltage bootstrap unit and the ground, and the leak-proof sub-circuit is further connected with the clock generation sub-circuit and the external power supply. When the sampling hold sub-circuit is switched from a hold mode to a sampling mode, the bootstrap capacitor and the ground are disconnected by the leak-proof sub-circuit. According to the sampling hold circuit, leakage of electric charge on the bootstrap capacitor in a hold and sampling switching process is effectively prevented, and reducing of bootstrap voltage is prevented, and the degree of linearity of the sampling switch is guaranteed.

The invention relates to a method for measuring formaldehyde in aqueous solution by utilizing electrochemical luminescence of terpyridyl ruthenium. The aqueous solution sample containing the formaldehyde is taken to be mixed with terpyridyl ruthenium solution with the pH value of 8.6 and the concentration of 1mmol/L, wherein, the concentration of the formaldehyde aqueous solution is 0.9-300mg/L; after that, cyclic voltammetry is carried out within the range of 0.2-1.5v, and the speed is 0.1v/s; a working electrode of electrochemical luminescence measurement is a glassy carbon electrode, and then linear relation exists within a certain range according to the electrochemical illumination intensity and the concentration of the formaldehyde; quantitative analysis is carried out on the formaldehyde in the aqueous solution. The method can be used for measuring the content of the formaldehyde within the concentration range of 0.9-300mg/L. The method for measuring formaldehyde by utilizing electrochemical luminescence has the advantages of simple operation, rapid measuring speed, lower price of an analytical instrument and the like, and can be expected to be used for daily analysis.

The invention relates to the technical field of low temperature measurement, and especially relates to a method and device for quickly decreasing temperature. The method comprises the steps: enabling a cold head and a temperature control object to be separated through a thermal resistor device, employing the cold head of a refrigerating machine for accumulation of cold, thereby achieving the big temperature difference between the cold head and the temperature control object, achieving the cooling speed which is higher than the cooling speed which is achieved through the cooling capability of the refrigerating machine, and achieving the quick decreasing of temperature. During the quick decreasing of the temperature, the fine tuning is carried out through a heating device, thereby achieving the temperature decreasing at a constant speed. The invention proposes a method for achieving the temperature decreasing at the constant speed through employing the refrigerating machine. Compared with a liquid helium system, the system is simple in structure, and reduces a plurality of control valves and pipes. The system is low in cost, and has no other cost except some power supply needed in a process. Moreover, the system flexibly changes the cooling speed through controlling the start/stop of the refrigerating machine and the heating device, is stable, reliable and controllable in cooling speed, and can achieve the automatic control. The system is very good in linearity of temperature increase and decrease. Compared with the liquid helium system, the system is stable in temperature increase and decrease speed.

This invention discloses optical modules, and eyewear using them for performing viewing function(s) including viewing a shutter-based 3D display, viewing a polarization-based 3D display, emulating the Pulfrich effect, emulating a pair of pinhole glasses and emulating a pair of sunglasses. In one embodiment, an optical module comprises: a first liquid crystal layer between a first and a second transparent conductive layers; a transparent protective layer attached to the first transparent conductive layer; a third transparent conductive layer; a matrix-electrode layer, comprising an array of independently addressable electrode regions each being transparent and electrically conductive; a second liquid crystal layer between the matrix-electrode layer and the third transparent conductive layer; a first linear polarizer attached to the second transparent conductive layer and the matrix-electrode layer; and a second linear polarizer, having a polarization orientation orthogonal to the polarization orientation of the first linear polarizer, attached to the third transparent conductive layer.

A measurement-while-drilling servo-actuator for use in mud-pulse telemetry, which determines linear position of a poppet valve therein without counting revolutions of a stepper motor which positions said poppet valve. A sensor senses a magnetic field intensity value, or an inductance value, which is proportional to the position of the poppet valve relative to the sensor. A look-up table of reference outputs corresponding to known position of the poppet valve is used to determine the position of the poppet valve. A method of determining a position of a poppet valve in a mud pulser is further disclosed.

N-state with n equal or greater than 2 modified Linear Feedback Shift Registers (mLFSRs) having a non-reversible n-state switching function have been disclosed. An mLFSR can also contain a device that implements an n-state logic function of which one input is provided with a signal external to the mLFSR. The mLFSR can be in Fibonacci or in Galois configurations. N-state scramblers and corresponding descramblers applying an mLFSR are provided. N-state coding boxes apply non-reversible switching functions connected to n-state scrambling or descrambling functions. Sequence generators and detectors are also disclosed.

The invention relates to a high-gain low-noise frequency mixer which comprises a switch level module and an active load module. The common-mode voltage output end of the switch level module is connected with a common-mode feedback module which is used for stabilizing the common-mode voltage, the output end of the common-mode feedback module is connected with the active load module, the output end of the active load module is connected with the switch level module and a dual-capacitor cross coupled transconductance module, the switch level module is also connected with a tail current source module, and the switch level module uses an active Gilbert double-balance structure. According to the technical scheme, the equivalent transconductance value is effectively improved by using a gate drive and substrate drive dual-capacitor cross coupling manner on the basis of a traditional folded structure transconductance; and on the premise that the power consumption is not increase, the noise coefficient of the frequency mixer is reduced, and the gain of the frequency mixer is improved. Use of the active load module improves the conversion gain of the frequency mixer, and the common-mode feedback module is used to stabilize the common-mode voltage of the output point and improve the linearity of the frequency mixer.

The present invention claims a user behavior prediction system and method for multi-message interaction under hot topics, and belongs to the field of social network analysis. The technical scheme is characterized in that: the multi-message impact mechanism, including internal impact factors and external impact factors, is proposed; a BP (error BackPropagation) neural network with highly self-learning and adaptive capability, and the characteristics being capable of fully approximating arbitrary complex nonlinear relationships is taken into account, and the neural network is used to construct auser participation behavior prediction model; the simulated annealing algorithm is used to solve the problem of the local minimum of the BP algorithm, so as to ensure the stability and accuracy of the algorithm; and a multi-message correlation indicator is defined to measure the strength of interaction among multiple messages, and to more accurately characterize the impact of topics on the user participation behavior.

The invention discloses a sensor base body for a lever type pressure sensor. The sensor base body for the lever type pressure sensor comprises a press plate (1) on the sensor base body, a press plate support point (10) on the sensor base body, a sensor base body support arm (9), a sensor base body induction pressure transmitting rod connecting point (2), a sensor base body support arm support post (8), a sensor base body induction pressure transmitting rod (3), a sensor base body support arm support post press plate (7), a sensor base body press head (4) and a sensor base body substrate (6). The sensor base body for the lever type pressure sensor uses the lever principle and does not depend on elastic deformation, the material fatigue is avoided, and the life span can arrive at 2 years; the sensor base body for the lever type pressure sensor is formed in one die, bolts are not needed, and the consistency is guaranteed; the force of all the pressure points is the same, the linearity is high, and the late data processing is facilitated; the requirement for the processing precision is greatly lower than that of a circular arc-shaped base body.

This invention relates to a method for making a high-linearity and high-power CMOS structure and particularly to a field plate technology that is applied to a CMOS component, in which the field plate is formed on a dielectric layer of the CMOS, being arranged above a gate and a drain. An electric field is provided to significantly improve the RF linearity and output power of the CMOS component.

A driver utilizes selective biasing of the terminal of an operational amplifier to reduce offset in the operational amplifier output. Each operational amplifier input includes a differential input pair of transistors including a NMOS transistor and PMOS transistor. At low and high ends of the input voltage range these transistors are selectively and individually coupled to either a standard input or biased to be on so as to contribute offset for offset compensation. The transistors are biased in a conventional manner for input voltages between the low and high ends of the voltage range.

The invention relates to a method for determining content of crosslinked glucan filled in sodium hyaluronate gel. The method comprises the following steps: 1) using a pyrolysis gas chromatography-massspectrometry method for pyrolysis analysis of a plurality of groups of pure crosslinked glucan products with different masses and obtaining the linear relationship between the peak area and the massof a characteristic cracking peak according to a pyrolysis chromatogram; wherein the characteristic cracking peak is a characteristic cracking peak of glycerol; 2) performing the pyrolysis analysis ona sample to be tested, obtaining the peak area of the characteristic cracking peak of the sample to be tested according to the appearance time of the characteristic cracking peak, and obtaining the mass or content of the crosslinked glucan filled in the sample to be tested. The method is simple and quick to operate, and is accurate and reliable in results.

A 5G millimeter wave power amplifier linearization simulation method is disclosed, which exhibits universality. When a digital predistortion algorithm adopted by engineers or researchers is not suitable for the power amplifier model or some parameters in the digital predistortion algorithm are unreasonable, the simulation results of power amplifier circuit in ADS will directly and concretely get the result that the linearity is not improved or even deteriorated. By using ADS and MATLAB, the invention helps engineers to check the capability of the designed power splitting amplifier and the corresponding digital predistortion algorithm, and helps them to optimize the digital predistortion algorithm.