165results about How to "Consistent accuracy" patented technology

Miniaturized, five and six degrees-of-freedom magnetic sensors, responsive to pulsed DC magnetic fields waveforms generated by multiple transmitter options, provide an improved and cost-effective means of guiding medical instruments to targets inside the human body. The end result is achieved by integrating DC tracking, 3D reconstructions of pre-acquired patient scans and imaging software into a system enabling a physician to internally guide an instrument with real-time 3D vision for diagnostic and interventional purposes. The integration allows physicians to navigate within the human body by following 3D sensor tip locations superimposed on anatomical images reconstructed into 3D volumetric computer models. Sensor data can also be integrated with real-time imaging modalities, such as endoscopes, for intrabody navigation of instruments with instantaneous feedback through critical anatomy to locate and remove tissue. To meet stringent medical requirements, the system generates and senses pulsed DC magnetic fields embodied in an assemblage of miniaturized, disposable and reposable sensors functional with both dipole and co-planar transmitters.

The invention provides an inertia / astronomy / satellite high-precision integrated navigation system and a navigation method thereof. The inertia / astronomy / satellite high-precision integrated navigation system comprises a sensor module, an integrated navigation resolving module and a real-time display module, wherein the sensor module is sequentially connected in series with the integrated navigation resolving module and the real-time display module and comprises an inertia sensor, a star sensor and a satellite receiver; the integrated navigation resolving module comprises a four-step Runge-Kutta strapdown navigation resolving module, an astronomy attitude determination resolving module, an unequal-interval Kalman filtering module and a position and speed compensation algorithm module; and the real-time display module comprises a three-dimensional real-time display module. The navigation method realizes the real-time acquisition of sensor data, utilizes the inertia sensor data to carry out strapdown navigation resolving based on a four-step Runge-Kutta algorithm and can carry out the integrated navigation resolving on the inertia sensor data, star sensor data and satellite receiver data and carry out the real-time three-dimensional display on an integrated navigation result by utilizing a projection algorithm.

The invention relates to the field of analytical chemistry and discloses a method for rapidly detecting a main component in active lime and passivated lime. The method comprises the following steps: 1, weighing a proper amount of active lime and passivated lime samples and carrying out a blank test along with the samples; placing the samples into a heating container; adding a proper amount of hydrochloric acid solution; heating till the samples are completely decomposed; cooling a few undissolved substances of the passivated lime sample to the room temperature; after the solution is filled into a volumetric flask to fix volume, respectively extracting two parts of proper amount of test solution; and 2, respectively titrating calcium oxide and magnesium oxide or calcium and magnesium. Theinvention has the characteristics that the sample decomposition is simplified, and a measurement error is reduced and the analysis time is shortened by controlling the titer of EDTA and EGTA titrand within the burette volume range; two separately added indicating agents are prepared into a mixed indicating agent to be added once when the calcium and magnesium or magnesium oxide is directly titrated so as to reduce the operation time; and the final result is obtained by adding the experience correction coefficient in the passivated lime sample.

A cell image segmentation method includes receiving a cell image, performing a nuclei initialization step to find an internal marker and an external marker to obtain a potential nuclei and a potential cell boundary, calculating a gradient map of the received cell image, performing a filtering step on the gradient map to generate a filtered gradient map, performing a nuclei detection step to obtain a segmented nuclei, and performing a nuclei validation step to obtain a valid nuclei. The nuclei initialization step includes performing a blob detection step to obtain a nuclei candidate, an outlier removal step to obtain the internal marker, a distance transform step to obtain a distance map, and a cell boundary initialization step to obtain the external marker. In another embodiment, a nuclear-to-cytoplasmic ratio evaluation method using the above cell image segmentation method is proposed.

The invention, which belongs to the technical field of high-precision time synchronization, particularly relates to a pseudo-range-assisted-carrier-phase-based beidou common-view time transmission method. The method comprises: users at two places obtain pseudo range and carrier phase observation data and broadcast messages by a beidou receiver and data exchanging is carried out by an internent network; a pseudo-code ranging common-view clock difference and a carrier wave common-view clock difference are calculated respectively by using a beidou common-view algorithm; and then a real-time clock difference of the two places is obtained based on least square fitting and vondrak filtering. According to the method, no cycle-slip detection and ambiguity resolution are carried out; and thus compared with the existing common view algorithm with the pure carrier phase, the provided method is simple and real-time in-station clock difference resolution at the sub-ns order can be realized.

The invention relates to composite material skin net edge coordination tools and an assembling method for skins. The method comprises following steps: 1) arranging coordinators on the skin assembling tools, wherein the coordinators are provided with coordination holes; 2) mounting the skins on corresponding assembling racks, and prepositioning and clamping the skins; 3) drilling technologic holes in the skins through the coordination holes in the net edge coordinators; 4) positioning and fixing the skins on the corresponding racks through the coordination holes in the skins; 5) drawing net edge lines on the surfaces of the skins by the use of line drawing templates; 6) performing trimming based on the net edge lines after the skins are disassembled; and 7) assembling and positioning the different skins on an assembly frame through butt joint coordination holes. According to the invention, the net edge size of the skins are determined through the cooperation of the net edge coordinators and the line drawing templates, and the skins are positioned through the butt joint coordination holes in an assembling process, so that the accuracy of the net edge size of the composite material skins is improved, the structure of the frame is simplified, the operation is easy and visual, and the assembling efficiency is improved.

The invention discloses a star sensor lens and a method for large temperature range accurate measurement of azimuth angles of stars by using the same. The star sensor lens comprises a lens barrel, a base, lenses, an optoelectronic image sensor, a diaphragm and a light filter which also serves as a protective window, wherein each two lenses of the four lenses form a group, the two lens groups are arranged on the two sides of the diaphragm symmetrically, object lens expansion rings are arranged at the outer sides of the two lens groups, and a spring ring for restoring and fastening is arranged between the two lens groups. Through an expansion and contraction effect of the expansion rings, the distance between the two lens groups are finely adjusted in a passive mode, so that the focus offset caused by the amount of the fine adjustment between the lenses counteracts that caused by a thermal effect of the lenses and the lens barrel. The focus star sensor lens has excellent thermal stability. According to calculation, the thermal offset delta f / f of the lens focus f is no more than 2*10 within a temperature range from 20 DEG C below zero to 60 DEG C. Under a condition of a large temperature range, the accuracy of the measurement of the azimuth angles of stars of the star sensor lens reaches arc second order.

The invention relates to the field of electronic communication, and discloses a circuit for supplying a precise low-frequency clock signal, and a control method for the circuit. The circuit for supplying the precise low-frequency clock signal comprises an external precise clock and a resistance and capacitance (RC) oscillation circuit and an RC calibration circuit which are manufactured in the same chip, wherein the RC calibration circuit executes calibration according to the external precise clock and a successive approsimation register (SAR) logic and obtains a fixed RC constant; and a produced calibration code for controlling a capacitor array can adjust the capacitor array of the RC oscillation circuit in the same chip, so that the RC oscillation circuit outputs the low-frequency precision clock which is simple and effective. After the RC oscillation circuit finishes circuit calibration, the external high-frequency precise clock and the RC calibration circuit can be switched off, so that power consumption can be greatly reduced.

A process for preparing the tobacco stem shreds includes cutting short by 0.16-0.2 mm, slitting, flash steaming, puffing and drying. Said tobacco stem shreds can be used as part of the raw materials for cigarette.

A device, system and method for nondestructively obtaining qualitative and / or quantitative information relating to the material properties of a region in a diamond body comprises directing x-rays onto the body. The body can comprise sintered or unsintered diamond. The body can ultimately be in the form of a cutting element used with a subterranean drill bit. The x-rays penetrate the body and cause a target element within the desired region including the same to emit x-ray fluorescence. The emitted x-ray fluorescence is received and information relating to content, location, and / or distribution of the target element in the region within the body is determined therefrom. The measured region can extend axially or radially from a surface of the body, and the target elements are nondiamond materials that can be constituents of a substrate attached to the body, or of a container used during HPHT sintering of the body.

The present invention belongs to the field of computer graph and image processing technology, and is especially the method of converting pre-separated color PDF file into complex color PDF file. In available technology, pre-separated color PDF file can not be used in making-up and impose page in printing process and the complex color effect of pre-separated color PDF file can not be pre-viewed. The present invention is superposing principle process of converting pre-separated color PDF file into complex color PDF file. The converted complex color PDF file may be used directly in making-up and impose page of printing process to raise the efficiency and makes it possible for the user to pre-view the complex color effect of pre-separated color PDF file. In addition, the created complex color file has the same accuracy as the original pre-separated color PDF file during color grating output.

A firearm that provides a user with tactile biofeedback. The firearm includes a tactile reference feature that extends longitudinally along an exterior body surface and is formed with dimensions specifically tailored to harness the user's natural attributes of sensibility, proprioception, and neuromuscular memory to improve a user's accuracy.

The invention discloses a determination method for amygdalin in a peach seed. The method comprises the following steps: step 1, crushing the peach seed and then extracting the crushed peach seed by using an ASE extraction method so as to obtain extract; step 2, subjecting the extract to centrifugation so as to obtain supernatant; and step 3, analyzing the supernatant by using liquid chromatography. The determination method for amygdalin in the peach seed is simple to operate and high in detection precision.

A longitudinal coaxial gear-shiftable electrically driven bridge reduction gearbox assembly comprises a motor, a first shaft assembly (1), an intermediate shaft assembly (2), a main conical shaft assembly (3) and a differential mechanism assembly (4), wherein the intermediate shaft assembly (2) comprises an intermediate shaft (15), an intermediate shaft normally engaged gear (12) and an intermediate shaft low-speed gear (13); the main conical shaft assembly (3) comprises a driving bevel gear (10), a main conical shaft low-speed gear (14) and a fixing gear holder (9); the motor is connected with the first shaft assembly (1); the first shaft assembly (1) is engaged with the intermediate shaft normally engaged gear (12); the intermediate shaft low-speed gear (13) is engaged with the main conical shaft low-speed gear (14); the main conical shaft assembly (3) is connected with the first shaft assembly (1) through a sliding engaging sleeve (8); and the driving bevel gear (10) is engaged witha driven bevel gear (11) of the differential mechanism assembly (4). Small gears of AMT are realized, and the system cost is reduced while dynamic performance is considered.

The invention relates to an online resolving method, in particular to a method for resolving three-phase short-circuit fault critical clearing time (CCT) of a power system on line. The method comprises the following steps of: (1) calculating an initial value of CCT; (2) setting the maximum and minimum of fault clearing time; (3) searching the CCT through dichotomy; (4) judging whether the CCT is found; (5) resetting the initial value and calculating the initial value through a traditional method if the CCT is not found; and (6) ending the calculation if the CCT is found. According to the method, complementary advantages of the direct method and time domain simulation analysis are considered on the basis of error range analysis of a potential energy boundary surface (PEBS) method, when the CCT is calculated, the calculation result of the PEBS method is taken as the initial value, the CCT is accurately searched through the time domain simulation analysis method, and the requirements of precision and speed can be simultaneously met.

The invention provides a high-precision rotary table of a gapless connecting rod mechanism and capable of moving slightly. The high-precision rotary table of the gapless connecting rod mechanism and capable of moving slightly comprises a driving motor, a motor supporting base, a rotary table body, a rotary table base, a base plate and the connecting rod mechanism, wherein the connecting rod mechanism comprises a bearing a, a crank, a connecting shaft a, a connecting rod, a bearing b, a connecting shaft b, an oscillating bar and a bearing c, the output torque of the motor is used as power for the rotation of the rotary table, the output shaft of the driving motor drives the crank to rotate, the crank drives the connecting shaft a installed on the crank and then the connecting rod is driven to swing, the connecting shaft b is driven to rotate through the swinging of the connecting rod, the oscillating bar is driven to swing through the rotation of the connecting shaft b, and then the rotary table body is driven to rotate, namely the torque of the motor is transmitted to the rotary table body through the crank, the connecting shaft a, the connecting rod, the connecting shaft b and the oscillating bar, and the rotary table body is driven to rotate within the range of a certain angle through the swinging of the oscillating. According to the high-precision rotary table of the gapless connecting rod mechanism and capable of moving slightly, due to the fact that a proper transmission ratio is configured and a high-precision angular contact ball bearing is pre-tightened, bearing clearance is eliminated and accuracy is improved.

The invention provides a method for forecasting thermoelasticity valid attribute and local field of a composite material. The method comprises the following steps: acquiring the sum of Helmholtz free energies stored in all unit cells by using heterogeneous and periodically-distributed microstructure of the composite material as a study object; converting thermoelasticity analysis and solution problem into the problem of minimizing-acquiring stationary value in an energy equation under a restricted condition; performing variational analysis for the energy equation to obtain an Euler-Lagrange equation set for solving a wave function and corresponding inhomogeneous boundary conditions; rewriting the energy equation into a discrete form by the numerical analysis technology-finite element method; solving to obtain the density of Helmholtz free energies of the unit cells; applying a constitutive model using the density as an effective medium to the composite material; then changing the load and temperature conditions of the composite material to analyze the local field of the composite material. The method is high in practicability, high in universality, and can obviously raise the calculating speed and efficiency for such problems.

The invention discloses a method for synchronously detecting polycyclic aromatic hydrocarbons and derivatives thereof in blood and application thereof, and the method comprises the following steps: selecting related polycyclic aromatic hydrocarbons and derivatives thereof in blood in the same blood sample as target detection substances, and carrying out synchronous extraction, detection and analysis; to be specific, the method comprises the following steps: S1, establishing a PAHs and SPAHs relationship analysis mathematical model, screening SPAHs having relatively strong correlation with PAHs, and taking the screened SPAHs and PAHs as target detection objects; S2, extracting a target detection object; S3, purifying and separating the sample; and S4, carrying out sample concentration and detection: performing analyzing on a machine to obtain content data of multiple components of detected target objects PAHs and SPAHs. According to the application of the method, detected content data of PAHs and SPAHs in a blood sample and the relation are applied to evaluation of exposure characteristics of two kinds of pollutants commonly existing in the environment in people or individuals, the detection effect and specificity are improved, and the application range of detection data is expanded.

The invention discloses a determination method for linarin in Buddleja officinalis. The method comprises the following steps: step 1, crushing Buddleja officinalis and then extracting the crushed Buddleja officinalis by using an ASE extraction method so as to obtain extract; step 2, subjecting the extract obtained in the previous step to centrifugation so as to obtain supernatant; and step 3, analyzing the supernatant by using liquid chromatography. Analysis conditions of liquid chromatography are that a) a used instrument is a dual three-component liquid chromatograph; b) a C-18 chromatographic column with specifications of 3*100 mm and 3 [mu]m is employed as a chromatographic column; c) column temperature is 40 DEG C; d) flow velocity is 0.5 mL / min; e) a mobile phase is a methanol-0.1% acetic acid solution, wherein a volume ratio of methanol to an acetic acid solution with a mass percent of 0.1% at 20 DEG C is 48: 52; and f) detection wavelength is 326 nm. The determination method for linarin in Buddleja officinalis is simple to operate and high in detection precision.

The invention discloses a cutting and chamfering all-in-one machine for automobile air conditioner pipe components. The cutting and chamfering all-in-one machine comprises a power output mechanism, a material pushing mechanism, a clamping mechanism, a cutting mechanism and a chamfering mechanism, wherein the material pushing mechanism, the clamping mechanism, the cutting mechanism and the chamfering mechanism are arranged on a workbench. According to the cutting and chamfering all-in-one machine for the air conditioner pipe components, the material pushing mechanism, the clamping mechanism, the cutting mechanism and the chamfering mechanism are matched organically, so that the processes of material pushing, clamping, chamfering and cutting are completed coherently and are formed into a cycle; the machining efficiency is high, and the manual intervention is not needed in the machining process, so that the precision of the machined components is kept to be consistent.

A firearm that provides a user with tactile biofeedback. The firearm includes a tactile reference feature that extends longitudinally along an exterior body surface and is formed with dimensions specifically tailored to harness the user's natural attributes of sensibility, proprioception, and neuromuscular memory to improve a user's accuracy.

The invention discloses a drop test single-degree-of-freedom vehicle model-based vehicle parameter identification method, which comprises the following steps of: setting measurement points on a vehicle; identifying intrinsic frequencies of the vehicle under a no-load condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency by using a plurality of drop tests; adding mass onto a vehicle body, performing the drop tests respectively, and identifying intrinsic frequencies of the vehicle under a loading condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency; calculating the vertical stiffness of the vehicle body, the sprung weight of the vehicle body, pitching stiffness, pitching rotating inertia, side-tipping stiffness and side-tipping rotating inertia; calculating the stiffness Ksf of a front suspension and the stiffness Ksr of a rear suspension; calculating tire stiffness which is consistent with an actual stiffness result; and performing method accuracy verification. In such a way, requirements on test equipment are low, the tests are high in operability, the cost of a single test is lower, the accuracy is high, and a physical parameter calculation method is simpler.

The invention provides a coupling uncertainty acquisition method for a high-altitude electromagnetic pulse field line based on polynomial chaos expansion. The method comprises the following steps that(1) a coupling model of a field line of a transmission line under a high-altitude electromagnetic pulse is established, and related input parameters are determined; (2) according to uncertainty variables set by a user and a submissive statistic characteristic distribution type of the uncertainty variables, unified conversion is conducted according to demands, corresponding polynomial bases are used, and a coupling random response is subjected to polynomial chaos expansion; (3) according to types of different polynomials, coefficients of all the polynomials are obtained through corresponding-form Gaussian integral, and an analytic expression of a coupling response of the high-altitude electromagnetic pulse field line is obtained; (4) according to the coefficients of all the polynomials anddistribution types of the uncertainty variables, statistic characteristic parameters of the coupling response of the high-altitude electromagnetic pulse field line are obtained, a fluctuation range,a probability density distribution function and a cumulative probability distribution function are obtained by using a Monte-Carlo method.

The invention provides a rear sub-frame of an automobile applied to the technical field of auto parts. A front cross beam (1) is connected with one end of a left longitudinal beam (3) and one end of a right longitudinal beam (4) respectively, a rear cross beam (2) is connected with the other end of the left longitudinal beam (3) and the other end of the right longitudinal beam (4), after the front cross beam (1), the rear cross beam (2), the left longitudinal beam (3) and the right longitudinal beam (4) are connected, a mouth-shaped structure is formed, the front cross beam (1), the rear cross beam (2), the left longitudinal beam (3) and the right longitudinal beam (4) are structures made of aluminum alloy materials, and the rear sub-frame of the automobile is designed into a structure prepared through the integrated molding process. The rear sub-frame of the automobile is simple in structure and low in cost and has the advantages of being ligh, integrally formed, short in molding time, consistent in performance, free or connection defects, high in accuracy and the like. When collision occurs, the rear sub-frame of the automobile can effectively absorb external impact, and the safety of passengers is ensured when the whole automobile is in use.

The invention discloses a detection method of phage. The detection method comprises the following steps: S100, preparation of a culture medium: preparing a host culture medium which is suitable for growth of a phage host bacterium; S200, coating a bacterium suspension: coating a phage host bacterium suspension on the host culture medium to form a detection culture medium; S300, detection of the phage: detection of phage in gas: firstly, exposing and placing the detection culture medium in a to-be-detected region, then, culturing, and calculating the quantity of phages by using an OmeiLianski formula; and detection of the phage in a liquid: firstly, coating the detection culture medium with a to be detected liquid, then, culturing and calculating the quantity of the phages in the liquid. The detection method disclosed by the invention not only can be used for accurately detecting the quantity of the phages in gas of an industrial factory district, but also can be used for accurately detecting the quantity of the phages in liquids of the industrial factory district such as sewers and decontamination pools.