607 results about "Coefficient of variation" patented technology

In one embodiment, a combustor (28) for a gas turbine engine is provided comprising a primary combustion chamber (30) for combusting a first fuel to form a combustion flow stream (50) and a transition piece (32) located downstream from the primary combustion chamber (30). The transition piece (32) comprises a plurality of injectors (66) located around a circumference of the transition piece (32) for injecting a second fuel into the combustion flow stream (50). The injectors (66) are effective to create a radial temperature profile (74) at an exit (58) of the transition piece (32) having a reduced coefficient of variation relative to a radial temperature profile (64) at an inlet (54) of the transition piece (32). Methods for controlling the temperature profile of a secondary injection are also provided.

A method for in-season macro and micronutrient application based on predicted yield potential, coefficient of variation, and a nutrient response index. The inventive method includes the steps of: determining a nutrient response index for a field; determining the normalized difference vegetation index (NDVI) of an area to fertilize; determining the coefficient of variation of NDVI over a plot; determining a predicted crop yield for the area without additional nutrient; determining an attainable crop yield for the area with additional nutrient; determining the nutrient requirement for the area as the difference between the nutrient removal at the attainable yield minus the nutrient removal at the predicted yield, adjusted by the efficiency of nutrient utilization in the particular crop as indicated by the coefficient of variation.

Disclosed is a method for producing a structure having: a stripping step in which an aluminum member including an aluminum substrate and an anodized layer present on the aluminum substrate, which layer contains micropores having an average pore diameter of 10 to 500 nm and a coefficient of variation in pore diameter of less than 30%, is electrolyzed in an aqueous acid solution by using the aluminum member for a cathode to thereby strip the anodized layer off the aluminum substrate so as to produce a structure composed of the anodized layer with a plurality of recesses. The method can produce a structure having regularly arranged recesses in a reduced time.

The invention discloses a method for quantitatively evaluating the uniformity of the cigarette density distribution. The method comprises the following steps: firstly making a cigarette density distribution curve according to the characteristic that the cigarette density is generally distributed in a way that two ends are dense, removing a dense end of a cigarette by utilizing an inflexion method, and then quantitatively evaluating the uniformity of the cigarette density distribution by utilizing a coefficient of variation method. The method is simple and feasible and capable of quantitatively evaluating the uniformity of the cigarette density distribution. By adopting the method, the mass stability of the cigarette after being rolled can be objectively reflected, and reference can be further provided for the improvement and optimized control of the cigarette quality.

Described is a structural body including at least partially an aluminum member having on a surface an anodized film with micropores present, in which: the micropores have a coefficient of variation in pore size of 5 to 50%; and the micropores are each sealed with a metal. The structural body can generate localized plasmon resonance having a sufficiently large intensity and be produced at low cost through a simple production process, and having a large surface area.

An example system and method of locating a source of a heart rhythm disorder are disclosed. In accordance with the method, a first pair of cardiac signals is processed to define a first coefficient associated with variability of the first pair of signals at a first region of the heart. Further, a second pair of cardiac signals is processed to define a second coefficient associated with variability of the second pair of signals at a second region of the heart. Thereafter, the first coefficient of variability is compared to the second coefficient of variability to determine a direction towards the source of the rhythm disorder.

Provided is a method for color correction of a tiled display device. The method comprises steps: determining respectively R, G, and B original target tristimulus values according to R, G, and B original target color coordinates and original target brightness prestored in the tiled display device; determining respectively R, G, and B target tristimulus values according to R, G, and B original target color coordinates and original target brightness of each display unit prestored in the tiled display device; determining respectively proportionality coefficients of variation of the R, G, and B tristimulus values according to the R, G, and B original target tristimulus values and target tristimulus values; determining respectively relative values of the R, G, and B tristimulus values of each display unit according to each proportionality coefficient and relative values of the R, G, and B original tristimulus values prestored in each display unit; and performing consistency calibration on colors of the tiled display device according to the relative value of each R, G, and B tristimulus value. The invention provides a corresponding system which improves calibration efficiency of each display unit of the tiled display device.

A standardized acquisition methodology assists operators to accurately replicate high resolution B-mode ultrasound images obtained over several spaced-apart examinations. The methodology utilizes a split-screen display in which the arterial ultrasound image from an earlier examination is displayed on one side of the screen while a real-time “live” ultrasound image from a current examination is displayed next to the earlier image on the opposite side of the screen. A computerized echo edge recognition and tracking methodology automatically identifies ultrasound echo boundaries of the intima-media complex and automatically extracts IMT and arterial dimension measurements, without introducing human measurement error. Measurement accuracy is enhanced by use of sub-pixel resolution for echo edge boundary definition. Utilizing this methodology, measurement of vascular dimensions, such as carotid arterial IMT and diameter, the coefficient of variation is substantially reduced to values approximating from about 1.0% to about 1.25%. Dynamic material properties of arterial structures are measured in a standardized region in accordance with a standardized methodology in order to promote measurement repeatability.

The invention discloses an industrial procedure for identifying preferential seepage channels of oil and gas reservoirs of clastic rock. The industrial procedure includes steps of 1), dividing n development phases and dividing wells into n groups according to the development phases of well drilling time; 2), dividing data grids of research areas; 3), interpolating permeability parameters of well points of the well groups 1 to obtain permeability planar distribution grids of the development phases 1; 4), sequentially acquiring permeability planar distribution grids R<1>, R<2>, ..., and R<n> of the n development phases by the aid of a method implemented in the step 3); 5), computing a variation coefficient of a permeability value of each grid point by the aid of results obtained in the step 4) so as to obtain variation coefficient grids P; 6), subtracting the R<1> from the R<n>, assigning values of 1 to the grid points with positive difference values and assigning values of -1 to the grid points with negative difference values to obtain grids T; 7), multiplying the grids P by the grids T to obtain grids Q, drawing contour maps of the grids Q, and utilizing regions larger than 0.3 in the contour maps as the preferential seepage channels. The variation coefficients of the permeability values of the grid points change along with change of the development phases. The industrial procedure has the advantage that oilfield water-flooding development and remaining oil prediction can be guided.

A method for sensing touch inputs to a digital equipment is provided, comprising the steps of sensing a sound/vibration signal generated by a touch, digitally processing the sensed sound/vibration signal, and determining the type of touch means that has generated the touch and the intensity of the touch based on the properties of the processed sound/vibration signal, wherein the properties include at least one of the following properties of the sound/vibration signal in time domain: maximum amplitude, average amplitude, average frequency, mean, standard deviation, standard deviation normalized by overall amplitude, variance, skewness, kurtosis, sum, absolute sum, root mean square (RMS), crest factor, dispersion, entropy, power sum, center of mass, coefficients of variation, cross correlation, zero-crossings, seasonality, DC bias, or the above properties computed for the first, second, third or higher order of derivatives of the sound/vibration signal; and the following properties of the sound/vibration signal in frequency domain: spectral centroid, spectral density, spherical harmonics, total average spectral energy, band energy ratios for every octave, log spectral band ratios, linear prediction-based cepstral coefficients (LPCCs), perceptual linear prediction (PLP) cepstral coefficients, mel-frequency cepstral coefficients, frequency topology, or the above properties computed for the first, second, third or higher order of derivatives of a frequency domain representation of the sound/vibration signal. There is also provided a device for sensing touch inputs.

The present invention discloses a rapid image text detection method based on a multi-channel and multi-dimensional cascade filter. The problem is mainly solved that the recall ratio is low and the speed is slow in the prior art. The method comprises: 1) extracting a maximum stable extremum region in the different channels and scales of an input image as a character candidate region; 2) removing the background region in the character candidate region by employing a cascade filter from coarse to fine, namely setting a threshold value for the morphological features of the character candidate region, and performing the first grade coarse filtration; setting thresholds for the stroke width and the stroke width variable coefficient of the character candidate region, performing the second grade coarse filtration, then removing the overlapping regions, and employing a convolution neural network binary classifier perform fine filtration; and 3) aggregating the region into the character string according to the geometry and the position feature of the character candidate region after cascade filter through a graph model. The rapid image text detection method based on the multi-channel and multi-dimensional cascade filter has high recall ratio, high accuracy and fast speed, and can be used for detection of image text at various interference surroundings.

A radiation detector of a compact size and producing almost no image defect is disclosed, comprising a first radiation-transmissive substrate, a first adhesive layer, a second radiation-transmissive substrate, a scintillator layer and an output substrate provided with a photoelectric conversion element layer which are provided sequentially in this order, wherein an arrangement region of the scintillator layer in a planar direction of the layer includes an arrangement region of the photoelectric conversion element layer in a planar direction of the layer and an arrangement region of the first substrate in a planar direction of the substrate, and the arrangement region of the first substrate includes the arrangement region of the photoelectric conversion element layer; and when the arrangement region of the scintillator layer is divided to plural areas, a coefficient of variation of filling factor is 20% or less which is defined as a standard deviation of filling factor of phosphor of the plural areas, divided by an average value of the filling factor.

An electroluminescent phosphor comprising: ZnS-based phosphor particles and a coating layer provided on a surface of the particle, wherein the particles have an average particle size of from 0.1 to 20 μm, and a coefficient of variation in a particle size distribution of less than 35%, and a content of particles having 10 or more stacking faults with an interplanar spacing of 5 nm or less is 30% or more based on all of the ZnS-based phosphor particles.