32 results about "Spontaneous potential" patented technology

A method of measuring characteristics of a geologic formation, using the time, energy and spatial spectra of gamma rays induced by an accelerator, which allows (i) the measurement of the photoelectric absorption (Pe) factor of the formation using a gamma-ray spectrum detected from gamma rays induced in the formation, (ii) the calculation of a neutron porosity of the formation using the gamma-ray spectrum, and (iii) the determination of a bulk density of the formation using the spectroscopic measurements. The Pe factor may be inferred by directly mapping the spectroscopic measurements. The porosity may be calculated by relating the gamma-ray spectrum to a hydrogen content of the formation. The density may be determined by computing a gamma diffusion length of the formation based on the gamma-ray spectrum. In addition to these measurements, the resistivity of the formation and its spontaneous potential may also be measured using an electromagnetic induction system.

The invention relates to a fracture filling solute transport monitoring test device and method, which are suitable for monitoring and identifying fracture filling medium solute transport. The fracturefilling solute transport monitoring test device comprises a fracture filling model and a monitoring device, wherein the fracture filling model consists of a model main body, a water supply/outlet andflow stabilizing device and a monitoring device. A parallel smooth fracture model main body is filled with river sand to simulate fracture filling, Ag-AgCl electrodes are distributed on the fractures, and the dynamic change of fracture filling spontaneous potential parameters caused by solute transport is detected by the monitoring device to analyze the solute transport state in invisible fractures, so that a basis is laid for monitoring, evaluation and prediction of solute pollution in underground media. The method has the characteristics of high efficiency, convenience and high operability.

The invention provides a method for automatic calculation of a lithological curve by employing a logging curve in geophysical exploration, and belongs to the field of petroleum geophysical exploration. The method includes: (1) loading the logging curve, comprising curves of gamma, spontaneous potential, resistivity, neutron, and neutron lifetime; (2) respectively correcting the five curves, and obtaining corrected curves; (3) respectively reading the maximum GMAXi and the minimum GMINi of the five curves from the corrected curves; (4) calculating the curve shale content relative value Shi; (5) calculating the shale content; (6) calculating the final shale content Vsh; (7) calculating the lithological curve with the combination of the final shale content Vsh obtained by the step (6) and a measured density curve Density; and (8) outputting the lithological curve.

The invention discloses a method for detecting the pore pressure of a high pressure saltwater layer by using log information. In the method, the pore pressure of the high pressure saltwater layer is detected according to measured log information through a relational curve between sedimentary characteristic-based interval transit time, spontaneous potential and natural gamma log response characteristic and the pore pressure of the high pressure saltwater layer, so that scientific basis is provided for determining the density of safe drilling liquid during well design, and occurrence of complexand other terrible accidents in underground of the saltwater layer during the construction can be effectively prevented.

The inkjet head for discharging a water-based ink for inkjet recording is disclosed, the inkjet head including two or more types of metal members used at portions to be brought in contact with the water-based ink, wherein at least two of the two or more types of the metal members are electrically connected, and the two or more types of the electrically connected metal members have spontaneous potentials each of which is measured with a reference electrode Ag/AgCl in the water-based ink and which provide an absolute value of a maximum difference therebetween, the absolute value being not more than 60 mV. An ink jet head is provided, in which any corrosion of a metal member is suppressed.

The invention discloses an evoked potential extracting method based on random gradient adaptive filtering. Potential signals repeatedly stimulated are collected through multiple potential measuring systems and comprise mixed signals of spontaneous potentials, spontaneous potentials obtained after stimulation is applied, and evoked potentials, all the mixed signals are superposed for averaging, and an average mixed signal is obtained; the stimulation application time serves as a starting point of counting of extracting time, a section of signal with the length being N is extracted from the average mixed signal to serve as a first main signal, a signal obtained by delaying the first main signal by one time interval serves as a first reference signal, the first main signal and the first reference signal are input into LMS adaptive filters, and first output signals of all channels are obtained; then, the first output signals serve as second reference signals, a section of spontaneous potential with the length being N serves as a second main signal, the second reference signals and the second main signal are put into the LMS adaptive filters, and evoked potentials of all the channels are obtained. By means of the evoked potential extracting method, the evoked potentials high in quality are obtained under the background that adequate priori knowledge is not available, and the number of repeated stimulation times is effective reduced.

An embodiment of the invention provides a method for acquiring a logging density curve. The method includes the specific steps of acquiring a spontaneous potential curve of a target well and an interval transit time curve thereof; subjecting the spontaneous potential curve and the interval transit time curve to curve fusion computation on the basis of a wavelet transform Mallat algorithm so as to obtain a density coefficient curve of the target well; calculating density data of an area where the target well locates and the density coefficient curve to obtain the density curve of the target well. The method according to the embodiment has the advantages that lithological and physical characteristics contained in the spontaneous potential curve and the interval transit time curve are effectively extracted and are effectively fused by means of wavelet reconstruction based information fusion, and the logging density curve obtained by calculation is higher in precision and is more approximate to an actual density curve.

The invention discloses a brain evoked potential signal acquiring method. The brain evoked potential signal acquiring method comprises the following steps: S1, stimulating a brain by a frequency, acquiring waveforms of brain evoked potential signals stimulated every time, and simultaneously acquiring waveforms of randomly generated brain spontaneous potential signals, wherein brain spontaneous potential signals acquired at different times are different; S2, judging whether the wave amplitude of the waveform of an optional brain evoked potential signal in the waveforms of the brain evoked potential signals acquired in the time period is greater than a first set threshold value or not, if the wave amplitude of the waveform of the optional brain evoked potential signal in the waveforms of the brain evoked potential signals acquired in the time period is greater than the first set threshold value, entering the step S3, and if the wave amplitude of the waveform of the optional brain evoked potential signal in the waveforms of the brain evoked potential signals acquired in the time period is not greater than the first set threshold value, entering the step S4; S3, removing waveforms of brain evoked potential signals; S4, successively superposing the brain spontaneous potential signals and the brain evoked potential signals in the time period; and S5, displaying an oscillogram of the brain evoked potential signals. When the waveforms of the brain evoked potential signals are acquired, acquired interference noises, namely the waveforms of the brain evoked potential signals, can be filtered out effectively.

The invention discloses a soft tissue ache detecting and treating device. The device mainly comprises two parts, i.e. a detecting module and a treating module, wherein the detecting module comprises a patch electrode, a pin type electrode, an electrode clamp, an electrode connecting line, an electrode line connector, a detecting main board, an LCD (liquid crystal display) color screen, a waveform adjusting plate, a waveform adjusting knob, a waveform adjusting key and a detecting module power supply switch; the treating module comprises a treating main board, a treating control plate, a treating output plate, a temperature-control pin connecting line and a temperature-control pin. The pin type electrode detects that an electric signal enters a filtration and amplification circuit of the detecting main board through the electrode connecting line, the processed electric signal enters a single chip computer to be further processed, an acquired spontaneous potential which is processed is transmitted to the screen to be subjected to oscillography, a treating temperature parameter on the treating control plate is adjusted, a treating mode switch is turned on, the single chip computer is controlled to output low frequency PWM (Pulse Width Modulation) of, and then the connection/disconnection of a heating and driving control circuit of the temperature-control pin is controlled.

As an aluminum alloy for a microporous hollow material, an aluminum alloy is provided which contains Cu, which is an element having poor grain boundary corrosion resistance, in a reduced amount, can have a nobly kept spontaneous potential, contains a transition metal that does not adversely affect extrudability of the material, and has excellent corrosion resistance and extrudability. An aluminum alloy having a chemical composition comprising, in mass%, 0.05 to 0.20% of Fe, 0.10% or less of Si, 0.15 to 0.32% of Cu, 0.08 to 0.15% of Mn, 0.05% or less of Zr, 0.06 to 0.15% of Ti, 0.03% or less of Cr, and a remainder made up by Al and unavoidable impurities, wherein the amount of a gas in an alloy billet is 0.25 cc/100 g or less; and a method for producing an aluminum alloy, comprising producing a DC cast billet having the above-mentioned chemical composition by a melt treatment employing proper casting conditions so that the content of a gas in the DC cast billet can be reduced to 0.25 cc/100 g or less, and then subjecting the DC cast billet to a soaking treatment, wherein the soaking treatment comprises heating the DC cast billet to 550 to 590 DEG C at a rate of 80 DEG C/hour or less, then holding the heated DC cast billet at that temperature for 0.5 to 6 hours, and then holding the resultant product at a temperature falling within the range from 450 to 350 DEG C for 0.5 to 1 hour or cooling the resultant product to 200 DEG C or lower at a cooling rate of 50 DEG C/hour.

The invention discloses a submarine spontaneous potential observation method with transient electromagnetic double trailers and an electric interference correction method. The double trailers of a transient electromagnetic instrument are connected through a relay cable. An electrode cable is bound to the relay cable. A plurality of AgCl non-polarized electrode pairs are arranged on the electrode cable in sequence, and each group of electrode distance is identical. The weak positive buoyancy of the double trailers is applied to flatten the electrode cable to form horizontal observation. The electrode distance is enabled to be constant in the process of observing the spontaneous potential by horizontal towing on the sea floor, the false abnormality of the spontaneous potential caused by the change of the electrode distance can be eliminated, location is performed by the ultra-short baseline and the attitude sensor and the horizontal deflection angle is recorded and the electrode cable is maintained to be level during the towing process. Secondly, compared with the conductivity anomaly detected by the transient electromagnetic instrument, the potential anomaly caused by the bottom current is eliminated. In addition, the morphological method is applied to remove the interference of transient electromagnetic signals, and the filtering effect is improved. The guarantee can be provided for the more accurate observation of the spontaneous potential generated by the seafloor ore body.

An apparatus for measuring spontaneous potential (SP) of an earth formation includes a downhole tool that is moveable within a borehole by conveyance means. A portion of the conveyance means produces a reference DC potential signal. The tool includes a measurement electrode that produces a potential signal representative of SP of the earth formation. The tool also includes circuitry that measures a differential DC potential signal between the potential signal produced by the measurement electrode and the reference DC potential signal. SP data that characterizes SP of the earth formation is generated based upon the output of such circuitry. In one embodiment for a while-drilling tool, the conveyance means and tool are realized by a drill string with an insulative sleeve that supports the measurement electrode and electrically isolates the measurement electrode from the drill string. Other embodiments for while-drilling tools and tools for tough logging conditions are also described.