48 results about "Potential curves" patented technology

The invention discloses a position-sensor-free control method applicable to middle-high-speed switch reluctance motors, which includes the following steps: (1) in a single-pulse-width running mode, determining an intersecting point of a moving counter electromotive force curve and a transformer potential curve in a bottom area before an inductance linearly raises up; (2) fitting an inductance curve in the bottom area before the inductance linearly raises up by utilizing an inductance model, and solving a theoretical value of a rotor position corresponding to the intersecting point of the moving counter electromotive force curve and the transformer potential curve determined in the step (1); and (3) calculating the real-time rotating speed by the aid of the intersecting point determined in the step (1), and estimating a random position according to the specific rotor position and the real-time rotating speed to realize the normal operation of the motor and the adjustable control to the switch-on angle and the switch-off angle. The position-sensor-free control method applicable to the middle-high-speed switch reluctance motors is simple and easy to realize, capable of estimating the rotor positions in equilibration and non-equilibration conditions, and capable of realizing the adjustable control to the switch-on angle and the switch-off angle.

The invention provides a method and device for measuring the original thickness of a longshore bar in the ancient lake. The method comprises the steps that the distribution range of the longshore bar is determined according to a deposition distribution map of an ancient deposition period, and a well tie profile map of the longshore bar is drawn; a natural potential curve of the well tie profile map is divided into multiple sub-units; the area corresponding to the sub-units meeting a standard curve is used as the longshore bar in a specific period, wherein the standard curve is determined according to the hydrodynamic process of forming the longshore bar and lithofacies codes; the thickness of the longshore bar in the specific period is calculated; decompaction correction is conducted on the thickness of the longshore bar in the specific period, and the original thickness of the longshore bar in the specific period is obtained. Support is provided for obtaining of accurate ancient wind power existing when the longshore bar of the ancient lake forms.

The invention provides a method and device for conducting reservoir prediction through correction acoustic well logging curves. The method comprises steps of collecting well bypass materials, acoustic well logging curves and original density curves; determining an object function in accordance with well bypass materials, acoustic well logging curves and original density curves; collecting original natural potential curves or original natural gamma curves; determining a new object function in accordance with original natural potential curves or original natural gamma curves, original longitudinal wave velocity curves, original density curves and well bypass materials; setting the annealing temperature; determining corrected acoustic well logging curves in accordance with the corrected object target; and conducting reservoir prediction in accordance with corrected acoustic well logging curves. By the aid of the simulated annealing algorithm, the correction is conducted through acoustic well logging curves, synthetic records which are matched with well bypass are obtained, the important basic data are provided for multiplicity reduction and inversion accuracy improvement of sequential model inversion, and the accuracy of the reservoir prediction is improved further.

Disclosed is a method for driving a liquid-jet head comprising a passage-forming substrate in which pressure generating chambers communicating with nozzle orifices are formed; and a piezoelectric element provided on one surface of the passage-forming substrate via a vibration plate, and consisting of a lower electrode, a piezoelectric layer, and an upper electrode. The piezoelectric layer consists of a relaxor ferroelectric. A voltage between a potential V1, at which the capacitance of the piezoelectric element is maximal in a capacitance-potential curve of the piezoelectric element, and a potential V2, which has a larger absolute value than the absolute value of the potential V1 and at which an inflection point in the capacitance-potential curve is reached, is set as a drive start potential V0. The piezoelectric element is driven using a drive waveform having an ejection step for changing the potential from the drive start potential V0 to a potential V3, at which a driving electric field having an electric field strength of 100 to 500 kV / cm is generated in the piezoelectric layer, to contract the pressure generating chamber, thereby ejecting liquid droplets through the nozzle orifice.

The invention provides a lithium ion battery positive material, a lithium ion battery positive electrode containing the positive material, and a battery containing the positive material. The positive material comprises a lithium iron phosphate positive active material and iron phosphate, and the primary particle size of the iron phosphate is not lower than 20mum. The over-discharge resistance capability of the battery made of the positive material comprising large-granule iron phosphate and the lithium iron phosphate positive active material is excellent; and after cells made in the invention discharge to 2.0V, the cells continuously discharge to near 0V, the decrease trend of a positive electrode potential curve tends to stability, the rise of a negative electrode potential curve is not too high (generally not higher than 1.5V), and the above two potential curves become closer or intersect at 0V. Over-discharge is prevented, the safety of the monomer cells is guaranteed, and the low-potential-energy or uncharged safe transport is realized.

The invention discloses a natural potential curve baseline drift correcting method for seismic inversion, which comprises the following steps of: acquiring top depth and thickness data of a sandstone section; generating top depth and thickness data of a mudstone section, and generating depth values of sampling points corresponding to the mudstone section according to the sampling intervals of a natural potential logging curve; retrieving the data of the natural potential logging curve, determining natural potential amplitude values corresponding to the depth values of the sampling points of the mudstone section, and generating data points of the depth values of the sampling points of the mudstone section corresponding to the natural potential amplitude values; connecting corresponding data points of various mudstone sections to generate a natural potential curve baseline; and correcting the natural potential curve and the baseline to generate the corrected natural potential curve. The method can automatically calculate and correct the natural potential curve baseline, has higher accuracy, also can automatically process massive well data in batch, and is favorable for improving the accuracy and efficiency for correcting a seismic inversion logging curve.

The invention discloses a model generation method and device, and a lithology identification method and device. The model generation method comprises the steps of obtaining a training data set, wherein the training data set comprises multiple groups of instances, each group of instances comprises at least one piece of logging data and a data label, the at least one piece of logging data comprisesany one or more of a natural gamma curve, a natural potential curve, resistivity and a borehole diameter of the target area, and the data label is used for labeling lithology of the at least one pieceof logging data corresponding to different stratum depths; training a pre-constructed model by using the training data set to obtain a trained model, wherein the trained model is used for identifyinglithology of different stratum depths of the to-be-detected area. High automation of data processing and intellectualization of lithology identification can be achieved, the lithology identificationspeed and precision are improved, the labor intensity of interpreters is relieved, and the requirements for practical experience and professional technical knowledge of the interpreters are lowered.

The utility model provides a constant energy charging method for the lead-acid battery and a related charger, which converts the AC voltage into the DC voltage, and then into a lower voltage which is adapted with the charging voltage of the battery, the battery is charged in a manner of controlled intermittent impulse and constant energy. The control process of the constant energy is that: the charging current and the voltage of the battery is detected and analyzed, and then the charging potential is changed automatically according to the normal potential curve for the electrochemical reaction of the charged battery. The utility model has the advantages that implementing the automatically self adaptive control of the charging process with a simple circuit and low cost, reducing the mechanical stress from the twinkling fluctuation on the charging voltage, preventing the plates of the battery from being damaged, and prolonging the service life of the lead-acid battery significantly.

The invention provides a fluvial facies log facies rapid interpretation method and a fluvial facies three-dimensional sedimentary facies model deterministic modeling method. The fluvial facies three-dimensional sedimentary facies model deterministic modeling method comprises the steps of based on single layer interpretation data of each well, firstly performing log facies identification by using thickness and oil bearing property data and then performing log facies rapid correction based on the shape, amplitude and top / bottom contact relations of a natural gamma or natural potential curve of each single layer; by using the synthetic seismogram calibration technology, determining the seismic horizon corresponding to each single layer and extracting the corresponding root mean square attributes in a certain time window of the seismic horizons; by using the obtained log facies of each single layer and the corresponding root mean square attribute of each single layer, drawing a fluvial facies sedimentary facies map; inputting the sedimentary facies boundaries of fluvial facies river channels in the digital sedimentary facies map into geologic modeling software and establishing a three-dimensional sedimentary facies model by directly using the assignment method. The log facies interpretation is more efficient and rapid and sedimentary facies maps are more accurate; nondeterminacy of sedimentary facies models caused by random modeling is prevented; sedimentary facies models established by using the method can be used for constraining three-dimensional geologic model modeling such as porosity and permeability.

A method of measuring a capacitance (C) of a sensor having a working electrode that is coated by an insulating layer and a ligand forming an affinity surface. The method involves the steps of bringing the electrode into contact with an analyte, supplying a constant first current (I1), and a constant second current (I2) of opposite direction to the first current (I1), and a constant third current (I3) of same direction as the first current (I1) during determined time periods to the sensor. Further the method includes sampling the potential (V) built up across the sensor, and calculating the capacitance of the sensor from the inclination (B, D, F, H) of a potential curve received in response to the current supply. A method used for detection of an interaction between a ligand and an analyte is also disclosed.

The invention discloses a clastic rock sedimentary microfacies discrimination method. The method comprises steps that seismic data is utilized to determine a stratum reflection structure; a natural potential curve is utilized to calculate a logging curve form; rock core data is utilized to analyze bedding structures; flake data is utilized to determine a granularity combination form; and sedimentary microfacies is discriminated through comprehensively utilizing the seismic, logging, rock core and flake information. The method is advantaged in that geological resolution is improved step by step from a macroscopic mode to a microscopic mode, limitations of single data in the sedimentary microfacies discrimination process are made up, sedimentary microfacies can be more accurately discriminated, and technical support is provided for oil and gas exploration and development.

The invention relates to a transient voltage stability quantitative evaluation method based on equivalent impedance of a critical system. The transient voltage stability quantitative evaluation method based on equivalent impedance of the critical system comprises the following steps of selecting a monitoring bus when a system fails; gaining an equivalent impedance curve and an equivalent potential curve of the system by using the monitoring bus and gaining a state variable and an algebra variable of a direct-current or load dynamic model at the monitoring bus during clearing of fault; establishing an equivalent system model; gaining an equivalent impedance curve of the critical system; and calculating a transient voltage stability quantitative evaluation index of the system. Dynamic response characteristics of a direct-current element, a load and the like are sufficiently considered, and transient voltage stability quantitative evaluation is realized. The transient voltage stability quantitative evaluation method can be used for on-line analysis control and off-line simulation analysis of a power system, and facilitates running of an alternating-current to direct-current system; analyzing workers can determine stability of transient voltage, identify weak nodes and timely take effective measures; and the safe and stable running level of a large power grid is improved.

The invention discloses a fitting method of open circuit potential curves of electrode materials for lithium ion batteries. The fitting method of open circuit potential curves of electrode materials for lithium ion batteries includes the following steps that (1) a hyperbolic tangent function y = tanh (x) and a exponential function y = exp(x) is selected as the basic form of a open circuit potential curve fitting mathematical function; (2) the stepwise fitting process of the open circuit potential curve is started and the turning section of each platform is fitted into the form of hyperbolic tangent function and the sharp change section of each voltage is fitted into the form of exponential function; (3) the hyperbolic tangent function and the exponential function are summed up and a total fitting function and its total fitting curve are obtained, and the total fitting curve is subtracted with the target open circuit potential curve and a fitting error curve is gotten; (4) the fitting error curve is fitted again by using the hyperbolic tangent and the exponential function, so as to optimize the fitting result and reduce the fitting error until satisfying the demand of fitting precision. The fitting open circuit potential curves has the advantages of making the function more accurate and making the simulation effect more effective.

An object of the present invention is to clarify what sort of necessary condition based on the principles of cell reaction a charge-receiving performance is configured under, this performance being 1.5 times or more of a conventional lead storage cell, and to determine the necessary cell configuration on the basis of the clarified necessary condition. In a liquid lead storage cell in which charging is performed intermittently in short time intervals and high-rate discharge to the load is performed in a partially charged state, an electrochemical measurement system is configured by placing a reference electrode as a reference point of potential between a negative electrode panel and a positive electrode panel, the relationship between the negative electrode charging overvoltage and the positive electrode charging overvoltage and their corresponding charging currents is plotted to create a current-potential curve, and in an area where the current-potential curve is plotted resembling a straight line from a charging overvoltage of 0, the negative electrode active material of the negative electrode panel satisfies the relationship [negative electrode charging overvoltage / current]<=9.4, and the positive electrode active material of the positive electrode panel satisfies the relationship [positive electrode charging overvoltage / current]<=17.7.

A positive electrode material capable of achieving high charge and discharge efficiency and a secondary battery using the positive electrode material. The positive electrode material contains a Li.Ni composite oxide or a Li.Ni.Co composite oxide. Each of the composite oxides has a characteristic that a reduction wave in a current-potential curve obtained by cyclic voltammetry does not have a current peak in a range where the potential is larger than 3.4V and smaller than 3.6V with a Li metal potential used as a reference. The Li.Ni composite oxide has a mole ratio of Ni to Li (Ni / Li) larger than 1.0 and is therefore non-stoichiometric. Thus, in the positive electrode made of the positive electrode material, occurrence of a distortion in a charging and discharging process is suppressed, polarization does not become large even at the last stage of the discharge, and a high charge and discharge efficiency can be achieved.

The invention discloses a continental clastic rock four-phase-in-one depositional microfacies discrimination method comprising the following steps: A, using earthquake data to determine a stratum reflection structure; B, using a nature potential curve to calculate logging curve forms; C, using rock core data to analyze bedding structures; D, using lamina data to determine a granularity combinationform; E, combining earthquake, logging, rock core and lamina information so as to identify depositional microfacies. The method can combine the earthquake, logging, rock core and lamina information to identify depositional microfacies; the method gradually increase the geology resolutions from macroscopic to microscopic, thus making up limits of using single data to identify depositional microfacies, more accurately identify the depositional microfacies, and providing technical supports for oil gas exploration.

The invention discloses a response potential quantification method for polymorphic elastic load cluster control. The response potential quantification method comprises the following steps: reading related data of centralized industrial loads and distributed civil loads; Grouping and aggregating the distributed civil loads; Calculating the overall adjustment performance parameters of each group ofcivil aggregation loads; Constructing a response potential quantification model controlled by the polymorphic elastic load cluster based on the adjustment characteristics of the industrial load and the civil aggregation load; And solving the model to obtain a comprehensive response potential curve controlled by the polymorphic elastic load cluster. The invention provides a response potential quantification method for polymorphic elastic load cluster control. Based on the complementary regulation characteristic of the polymorphic elastic load, the comprehensive response potential of various elastic load control in the cluster is fully excavated, the advantage complementation of the polymorphic elastic load and the large-scale wind power is favorably realized, and the absorption capacity ofthe power grid to the wind power is improved.

The present invention relates to a synthetic focusing method for induced polarization logging. It is characterized by that logging can be divided into two partial fields, the first partial field uses main electrode to transmit constant current, its guard electrode does not transmit current, and can record the partial field induced polarization potential on its correspondent monitoring electrode and current-interrupted secondary potential attenuation curve; the second partial field uses guard electrode to transmit constant current, and its main electrodes does not transmit current, and can fit secondary partial field potential attenuation curve to obtain secondary potential amplitude, and can make the secondary partial field potential be equivalent on the partial field induced polarization potential to obtain induced polarization potential curve when the partial field is powered on, then superimposes the electric field and monitoring electrode potential focusing and synthesizes polarization total field potential so as to obtain the focused first potential, induced polarization total field potential and secondary potential attenuation curve. Said invention can raise measurement accuracy.

A method for providing measuring data for the precise local positioning of an ablation catheter comprises the recording of electrophysiological potential curves in a plurality of positions of the ablation catheter with regard to a potential measurement on a reference catheter. An x-ray image is recorded in each of the positions and the position of the ablation catheter in each instance on the x-ray image is characterized by a marker. The electrophysiological potential curves are coupled in a data-related manner with the markers. When a marker on the screen displaying the x-ray image is clicked on, the associated electrophysiological potential curves appear highlighted on another screen, if necessary in color or with increased brightness. Conversely, the x-ray image with the marker is queried, i.e. displayed and the marker highlighted when the potential curve is activated on a screen displaying the potential curve.

The invention relates to a synthetic focusing method capable of inducing polarization well logging. According to the synthetic focusing method, nine annular electrodes are embedded in a columniform insulating rod to form an electrode system, wherein two pairs of monitor electrodes and two pairs of shielding electrodes are symmetrically arranged with a main electrode in the center; the electrodes are short-circuit mutually; a well logging is divided into a plurality of split fields to supply power separately, and corresponding split field inducing polarization potential of the split fields and a secondary potential attenuation curve after power-off are recorded; split field secondary potential is equivalent to the split field inducing polarization potential to obtain an inducing polarization potential curve during power supplying of the split field; and then polarization total field potential is synthesized by means of an electric field superposition principle and equipotential focusing synthetic conditions to obtain the attenuation curve of primary potential, inducing polarization total field potential and the secondary potential, a specific resistance and polarizability well logging curve after focusing. The synthetic focusing method has the advantages that the detection depth of the method reaches 2.4m, while the layering capability reaches 0.5m; and meanwhile, the method can reduce influences on inducing polarization well logging caused by boreholes, wall rocks and invaded zones, thereby increasing both the layering capability and measuring precision.

The invention relates to a grounding resistance short-distance measurement method and system with a compensation correction function and belongs to the technical field of resistance measurement. The system comprises an alternating-current signal source I, an ampere meter I, a voltmeter I, an alternating-current signal source II, an ampere meter II, a voltmeter II, a current electrode, an auxiliarycurrent electrode and a double-pole double-throw switch; the alternating-current signal source I is connected in series with the ampere meter I, and then the alternating-current signal source I and the ampere meter I are connected in parallel with the voltmeter I, so that a circuit I is formed; the alternating-current signal source II is connected in series with the ampere meter II, and then thealternating-current signal source II and the ampere meter II are connected in parallel with the voltmeter II, so that a circuit II is formed; the circuit I and the circuit II are connected through thedouble-pole double-throw switch; the ampere meter I and the voltmeter I are connected with the current electrode; and the ampere meter II and the voltmeter II are connected with the auxiliary currentelectrode. When the grounding resistance of a grounding grid is measured, the problems of long paying-off distance, high safety risk and large working difficulty of a conventional long-distance method are effectively overcome. The ground potential curve superposition curves of two grounding bodies into which reverse current is injected is corrected, so that measurement precision is improved.

A method and system for constructing logging parameters reflecting reservoir productivity are disclosed and the method comprises the following steps of 1) setting left and right scales of a natural gamma curve and a natural potential curve on a log curve for a target reservoir segment; 2) calculating an overlap difference ci of each depth point i in the target reservoir segment; and 3) accumulating the porosity ap of the target reservoir segment when ci is less than c0. The invention, aiming at the difficulty of logging evaluation productivity, designs a method for constructing parameters capable of reflecting reservoir productivity by using the natural gamma, natural potential and logging interpretation porosity data, and is simple in process, easy to operate and good in practical application effect.

The invention provides a hard electrode combined logging instrument for logging a drill well. The logging instrument comprises a current-return electrode, an emission electrode and an electronic circuit; the logging instrument is capable of realizing one-time well descending, thus being capable of performing the measurement on data of an electrode system; the electronic circuit comprises a power supply circuit, a measurement amplification circuit, a scale circuit, a power control circuit and a communication interface circuit. The logging instrument provided by the invention has the beneficial effect of being capable of measuring a conventional curve required by a user, and also measuring a potential curve and a gradient curve simultaneously by one-time well descending under the control of a telemetry instrument.

The invention provides a negative pole material of a lithium iron phosphate power battery and a preparation method of the negative pole material. The negative pole material of the lithium iron phosphate power battery has a core-shell structure, of which petroleum coke serves as a core and carbon serves as a shell. According to the core-shell-structured negative pole material of the lithium iron phosphate power battery, provided by the invention, the petroleum coke has relatively high adaptability to various electrolytes and is relatively good in overcharging and overdischarging performance and relatively high in safety, and a charging and discharging potential curve of the petroleum coke is free of a platform (the charging and discharging potential curve is of a slope in the range of 0V to 1.2V), so that the condition of attenuation of capacity of the power battery can be very conveniently monitored according to voltage changes; the electric potential of the petroleum coke is higher than that of lithium, so that the deposition of lithium metal on a negative pole can be avoided. In addition, by taking the petroleum coke as the core and taking the carbon as the shell, the petroleum coke can be effectively prevented from volume expansion during lithium inserting, and thus the shortening of the life of the power battery is effectively prevented.

The invention discloses preparation method and application of a binary electrolyte gel polymer electrolyte. The preparation method comprises the following steps of 1, mixing and dissolving an electrolyte and distilled water to form a conductive solution; 2, adding an electrolyte used as a carrier into the conductive solution to form a binary electrolyte gel electrolyte; and 3, applying the prepared binary electrolyte gel polymer electrolyte into a fuel cell, and performing charge-discharge test to achieve a stable discharging potential curve. The binary electrolyte comprises the electrolyte and the electrolyte used as the carrier, wherein the electrolyte is one of anhydrous sodium sulfate, anhydrous sodium carbonate or anhydrous potassium carbonate, the electrolyte used as the carrier is sodium polyacrylate, and the binary electrolyte gel polymer electrolyte is applied to the fuel cell. According to the preparation method and application of the binary electrolyte gel polymer electrolyte, and the successfully-prepared binary electrolyte gel polymer electrolyte is applied to a hydrogen fuel cell and has the advantages of practicability, environmental-friendliness, safety, low cost and the like.

The invention discloses a method and a system for detecting the position of a drilled hole in a roadway. The method comprises the following steps that a first power supply electrode is arranged in theposition, exposed to the ground, of the drilled hole, and a second power supply electrode is buried in the ground surface with a first preset distance from the drilled hole, wherein the first power supply electrode is used for supplying power to the drilled hole; a first measurement electrode and a second measurement electrode are arranged in the roadway, wherein the first measurement electrode is used for measuring potential values in different positions in the roadway, and the second measurement electrode serves as an infinite electrode; the potential values of a plurality of position points in the roadway are measured, and a potential curve is generated according to the potential values of the position points and the positions of the position points in a roadway direction; and the position, corresponding to the maximum value of the potential values in the potential curve, in the roadway direction is determined, so that the corresponding position of the drilled hole in the roadway direction is determined. According to the method, the position of the drilled hole in front can be detected in the roadway, so that the convenience is provided for underground coal mine construction.