52results about How to "Reduced Sensitivity Effects" patented technology

A method for suppressing measurement system signature, or artifacts, that arise when controlled source electromagnetic survey data are inverted to obtain a resistivity image of a subsurface region. The method involves identifying regions (47) where the image has low or rapidly varying sensitivity to data acquired by a given receiver, typically regions close to and under the given receiver. Then, in the iterative inversion process where a resistivity model is updated to minimize an objective function, the model update is modified (48) to reduce the impact of such low sensitivity regions on the update.

The invention provides a fingerprint identification device and a manufacture method thereof. The fingerprint identification device comprises a transparent cover plate, a first light shield layer, a pattern layer and a fingerprint identifier; the transparent cover plate includes an inner surface; the inner surface includes a first area and a second area adjacent to the first area; the first light shield layer is arranged in the first area of the inner surface, and includes a first bottom surface opposite to the inner surface; the pattern layer is arranged in the second area of the inner surface, the color of the pattern layer is different from that of the first light shield layer, and the pattern layer includes a second bottom surface opposite to the inner surface; the maximal segment difference between the first bottom surface and the second bottom surface is lower than or equivalent to 6 micrometer; and at least part of the first shield layer and the pattern layer is placed between the fingerprint identifier and the transparent cover plate. Thus, influence of the light shield layer and the pattern layer on the sensitivity of the fingerprint identifier is reduced, and the sensitivity of fingerprint identification is improved.

The invention discloses a self-adaptive detect method of the gas dissolved in the oil of a drawing transformer, and a relative device, wherein the invention uses a high-density gas sensor array to check the object gas to obtain a first check value, when the first check value is higher than a preset threshold value, using the first check value as the check result, or else, uses a low-density gas sensor array to check the object gas again, using the second check value as the check result. And the invention judges if the ratio between the average value and mean square difference of the check values of all sensors in the array is over a preset value to check the condition of the array. The invention has high measuring accuracy, better repeatability, long service life, and low check cost.

The invention discloses an AGC control system capable of reducing a noise coefficient and increasing isolation. An automatic gain control circuit comprises two radio frequency switches and a low noise amplifier; the low noise amplifier is connected between the two radio frequency switches; an output end of a coupling circuit is connected with an input end of a detection circuit, and the output end of the detection circuit is connected with the input end of a controller; the output end of the controller is separately connected with control ends of the two radio frequency switches and the low noise amplifier for judging whether a DC voltage signal is greater than a preset signal threshold, if so, controlling the two radio frequency switches to directly connect a receiving end with the coupling circuit and controlling the low noise amplifier to close; and otherwise, controlling the two radio frequency switches to connect the receiving end with the coupling circuit through the low noise amplifier. The AGC control system disclosed by the invention can avoid saturation distortion of the low noise amplifier in the case of large signals and can also reduce the influence of insertion loss to the overall noise coefficient of a receiver in the case of small signals. The invention further discloses a receiver comprising the above-mentioned system.

The invention relates to the filed of car crash experimental devices, particularly to a device and method for calibrating sensitivity of chest displacement sensors in a dummy in a car crash test. The device includes a plurality of mutually independent measuring blocks suitable for being mounted at the chest of the dummy, to push the chest displacement sensors at the original positions in the chest of the dummy to move; and the measuring blocks are different in length, so as to prompt the chest displacement sensors to generate corresponding displacement. As the calibrating device is provided with the plurality of mutually independent measuring blocks suitable for being mounted at the chest of the dummy respectively and being different in length, the chest displacement sensors can be calibrated through adopting the measuring blocks to push the chest displacement sensors at the original positions in the chest of the dummy to move, as a result, the influence on the sensitivity of the chest displacement sensors, caused by dismounting and mounting of the chest displacement sensors in the prior art can be reduced.

The invention discloses a partition-based video steganography analysis method and system having the neighbourhood optimal probability. The method comprises the following steps of: selecting one from a partition mode set according to features of a video; for one video frame, counting a set of neighbourhood optimal SADs in all macro-block partition modes, calculating steganography analysis features of one video frame, and combining the features to obtain final steganography analysis features of one video frame; and, according to this, sequentially extracting steganography analysis features of all frames in one video. Oriented on detection of a video motion vector steganography method, aiming at the problem that the traditional prediction residual-based steganography analysis features are easily interfered by quantization distortion, the partition-based video steganography analysis method and system disclosed by the invention realize universal and precise steganography analysis to the motion vector steganography method through combination of quantization of macro-block partition to quantization distortion and neighbourhood optimal probability features.

The application discloses a receiver and communication equipment. The receiver comprises a first path and a second path. The first path is used for receiving radio frequency signals and generating baseband signals according to the radio frequency signal; the radio frequency signals comprise a useful signal and at least two interference signals, and the baseband signals comprise a difference frequency signal between the at least two interference signals. And the second path is used for receiving the radio frequency signals and determining whether to attenuate the radio frequency signals received by the second path according to the control signal so as to reduce the signal intensity of the interference signal in the second path, and the control signal is determined according to the signal intensity of the baseband signal generated by the first path. Through the above mode, the second-order intermodulation intercept point of the receiver can be improved, the anti-interference capability is enhanced, and the influence on the sensitivity of the receiver is reduced.

The invention discloses a microwave integrated device of a radio frequency front end low waveband circuit of a spectrum analyzer. The microwave integrated device comprises a printed board and is characterized in that a first frequency conversion unit, a first local oscillation channel, two 3.9214GHz first band-pass filters, a second frequency conversion unit and a zero frequency restraining unit are integrated to the printed board; a first frequency mixer is arranged on the first frequency conversion unit, and the second harmonic restraining capacity of the first frequency mixer reaches 70dB; a T-shaped resistance attenuation network and a first amplifier are arranged in the first local oscillation channel; the two first band-pass filters are respectively the absorption broadside coupling filter and the comb wave filter, and after the two first band-pass filters are connected in a cascade mode, out-of-band rejection of the two first band-pass filters can reach more than 70dB; the second frequency conversion unit is provided with a second frequency mixer and a second amplifier; the zero frequency restraining unit is provided with a coupler and a phase adjustment module. Double frequency conversion and zero frequency restraining in a low waveband are completed on one printed board, the design principle is greatly optimized, and the structure and layout are greatly simplified.

The invention discloses a medium-high carbon steel hot-rolled wire rod and a production method thereof. According to the production method, a blank is prepared into the wire rod through heating, hot rolling and stelmor cooling, the carbon content of the blank is larger than or equal to 0.45%, and the soaking section temperature of the heating procedure ranges from 1,140 DEG C to 1,250 DEG C; the hot rolling procedure comprises rough rolling, intermediate rolling, pre-finish rolling, finish rolling and spinning in sequence, and the initial rolling temperature is 1,030-1,100 DEG C; the spinningtemperature is 900-950 DEG C; the hot rolling procedure further comprises water cooling before finish rolling with the water flow being 1,200-1,800 L/min and 400-600 L/min in sequence, water cooling in finish rolling with the water flow being 20-100 L/min and the water pressure being 0-0.3 bar, and water cooling after finish rolling with the water flow being 1,200-1,800 L/min, 400-600 L/min and 900-1,200 L/min in sequence; and in the Stelmor cooling procedure, the speed of a roller way at an inlet section is 0.6-0.8 m/s, the first one or two fans and heat preservation covers are stopped, the continuous 6-13 fans and heat preservation covers behinds are started, all the fans and heat preservation covers behinds are stopped, and the air volume of the started fans is 50-100%. The obtained wire rod is excellent in structure and performance, the surface oxide scale is controlled, the bubble problem is avoided, and the wire rod is suitable for mechanical husking.

The invention discloses a calibration method and system for a threshold value of a smoke alarm. The calibration method comprises the following steps that S1, the LTD minimum value and the LTD maximumvalue are set; S2, a gain value is set; S3, a smoke sensing control chip receives the gain value, an LTD test is conducted, and an LTD test value is output; S4, it is judged whether or not the LTD test value is greater than the LTD minimum value and less than the LTD maximum value, and if yes, the step S6 is executed; if not, the step S5 is executed; S5, the gain value is adjusted according to a linear algorithm, the gain value is updated to a new gain value, and the step S3 is executed; S6, the threshold value of normal alarming is set for the smoke sensing control chip according to the LTD test value. Gain in the smoke sensing control chip is automatically adjusted, the LTD value is controlled in a reasonable range, thereby eliminating the influence of labyrinth difference on sensitivity, and the accuracy of calibration of the threshold value of the smoke alarm is improved.

The invention discloses an annular shear type deflection electric acceleration sensor and a laminated structure acceleration sensor. The annular shear type deflection electric acceleration sensor comprises a support rod, output terminals, an annular mass block and an annular sensing module made of a deflection dielectric material; the inner ring and the outer ring of the annular sensing module areplated with a metal film; the inner ring of the annular sensing block is arranged at the upper end of the support rod; the inner ring of the annular mass block is fixed at the outer ring of the annular sensing block; and the metal films of the inner ring and the outer ring of the annular sensing block are connected with two output terminals respectively through wires. As the acceleration is measured by using a linear relationship between a strain gradient which is generated by the deflection dielectric material along the axial direction and electric charge which is generated based on the deflection electric effect under the action of a shearing stress generated by the annular mass block, measurement of vibration is accordingly realized.

The invention provides a moving-resistant level gage allowing a connection line to be separated from a shifting fork assembly, and relates to a solid material level gage. A motor (18) is connected with a base (10) which is connected with a beam barrel (7), and the beam barrel (7) is provided with a front bearing (6) and a rear bearing (11) and combined with a shaft (3); one end of the shaft (3) is provided with a detection board (1), the other end of a spring (2) is provided with the shifting fork assembly (12) and a locating sheet (13), and the shaft (3) is in clearance fit with the shifting fork assembly (12); a gage base (12) is connected with a gage cover (16), and a motor assembly (14) is provided with a microswitch (23), a terminal (19), a rotary arm (22) and idler wheels (21). The moving-resistant level gage structurally avoids accidents caused by breaking off of a side line, and is simple in structure and low in cost, and a level switch controlled automatically is particularly in common use of upper limit and lower limit alarm of feeding bins in the industries of chemical engineering, metallurgy, mines, road building, grain, environment protection and the like.

The invention discloses a low noise transimpedance amplifier. The amplifier comprises a main amplifier, an auxiliary amplifier, a transimpedance, two current sources, and a source follower. The main amplifier and the auxiliary amplifier adopt a cascode structure. The drain electrode of a common-source field-effect tube of the main amplifier is connected to the input end of the auxiliary amplifier.The output end of the auxiliary amplifier is fed back to the grid electrode of the common-grid field-effect tube of the main amplifier. The two current sources inject currents into the drain electrode of the common-source field-effect tube of a dual-stage amplifier. The input end of the source follower is connected to the output end of the main amplifier. The output end of the source follower isthe signal output end of the transimpedance amplifier. In the invention, main and auxiliary cascode amplifiers and a similar gain-boost structure are used to reduce a noise, and the two current sources inject the currents into the common-source field-effect tube so as to further reduce the noise; and a current gain control structure is used to adjust an excessive input current signal gain so thatthe dynamic range of a circuit is increased.

The invention discloses a fingerprint machine shell. The fingerprint machine shell comprises a keyboard panel (1) and further comprises a side panel (3), a water suction cushion (4) and a light baffling block (5), wherein the side panel (3) is fixedly connected with one end of the keyboard panel (1); the side panel (3) is further provided with a fingerprint reading block mounting hole (2); the water suction cushion (4) is fixedly connected with the side panel (3) or the keyboard panel (1); the light baffling block (5) is fixedly connected with the side panel (3); the light baffling block (5) is arranged adjacent to the fingerprint reading block mounting hole (2). According to the fingerprint machine shell disclosed by the invention, the water suction cushion is used for obtaining water when fingers of people to be subjected to identity recognition or attendance recording are dried so as to be good for improving the fingerprint recognition efficiency and the fingerprint accurate recognition rate; the arranged light baffling block can eliminate the influences on the sensitivity of a fingerprint reading photoelectric module by external lights, so as to be good for improving the working efficiency and the fingerprint recognition rate of a fingerprint machine; meanwhile, the fingerprint machine shell disclosed by the invention is simple in structure and easy to manufacture and improve.

The invention relates to a power-off type electric leakage signal identification method. The method comprises the following steps: S1, acquiring a circuit residual current waveform; S2, carrying out current limiting on the overlarge current; S3, carrying out constant voltage biasing on a differential amplifier; S4, carrying out differential amplification on a leakage current waveform; S5, carryingout integral filtering relative to the bias voltage; S6, performing comparison operation with pre-stage output analog voltage by adopting a two-way comparator, so that positive and negative waves relative to the bias voltage are corrected into square waves in a positive voltage range after passing through the comparator; S7, performing OR operation on the two paths of comparison square waves; andS8, determining whether the signal is an electric leakage signal or not after the electric leakage characteristic is determined through a high-speed comparison recognition algorithm. The method has the advantages that the transient electric leakage characteristic can be quickly found, so that the electric leakage point can be accurately found, and misinformation and missing information are avoided.

The invention relates to a multifunctional anti-falling device of an attached type lifting scaffold. The anti-falling device comprises a wall-attached support and an anti-falling device body arranged on the wall-attached support; the wall-attached support comprises a wall-attached frame, two mounting seats fixed to the left side and the right side of the front face of the wall-attached frame, and a mounting beam with the two ends connected with the two mounting seats; a rotating shaft is arranged below the front side of the mounting beam, and the two ends of the rotating shaft are arranged on the mounting seats on the two sides; the anti-falling device body comprises an anti-falling block and a trigger block; the anti-falling block is obliquely and rotationally arranged on the mounting seats on the two sides through rotating shafts, and the top of the anti-falling block obliquely points to the front; the anti-falling block is connected with the mounting beam through a first elastic piece; and the trigger block is rotationally arranged in front of the anti-falling block, and the trigger block is connected with the anti-falling block through a second elastic piece. According to the anti-falling device, by obliquely arranging the anti-falling block, the top of the anti-falling block is close to a wall-attached guide rail as much as possible, so that the rotating distance of the anti-falling block is reduced, and the sensitivity of the anti-falling device is improved.

The invention relates to a planar circularly polarized electronic tag, which comprises a substrate, an antenna and a chip, wherein the substrate is used for accommodating the chip and the antenna; theantenna has a short circuit ring, a first antenna oscillator and a second antenna oscillator, each of the first antenna oscillator and the second antenna oscillators has two dipole arms that are conductively connected with each other, the first antenna oscillator and the second antenna oscillator are connected with each other and arranged in a crossing manner, so that the dipole arms are arrangedat an interval of 90 degrees, and the size of the dipole arms is set such that a phase difference between the adjacent dipole arms is 90 degrees; and the chip is matched with the antenna, and is arranged at a connecting point of the first antenna oscillator and the second antenna oscillator. By adopting the electronic tag, the polarization loss can be greatly reduced. In addition, the planar circularly polarized electronic tag further has high bandwidth and is capable of flexibly setting parameters such as impedance, geometrical shape, operating frequency and the like.