33 results about "Parabolic function" patented technology

A method is disclosed for moving, isolating and / or identifying particles in a sample by placing said sample in a spatially varying electrical field wherein the spatially varying electrical field is following a mathematical nonmonotonous function, selected from the group consisting of linear, hyperbolic, parabolic, parabolic functions or y~xp / q and combinations thereof wherein p q means an integer. Also various devices are disclosed for performing the method.

Methods and apparatuses for row-wise dark level non-uniformity compensation of imaging sensor pixel signals. A column dependent dark reference value is determined as one of a linear and parabolic function of signal values from two areas of dark reference pixels and a column location and then used for dark level non-uniformity compensation of signal values from imaging pixels.

Devices and methods for hands-on learning of mathematical parabolic concepts are provided. For example, a device for teaching mathematics includes a base having a plurality of channels for accepting vertical rods of varying lengths; a lever movably attached to the base at a pivot, the lever passing through the plurality of channels; and a plurality of vertical rods, each of the plurality of vertical rods located at least partially in one of the plurality of channels and resting on the lever; wherein the plurality of vertical rods are sized and arranged so that the tops of the vertical rods illustrate a parabolic function; and wherein moving the lever about the pivot moves the plurality of rods within the plurality of channels and illustrates changes to the parabolic function represented by the vertical rods.

The present principles relate to methods and apparatus for gamut mapping from a first color gamut to a second color gamut. The method includes, in a plane of constant hue: obtaining the target lightness of a color on the boundary of a first gamut having maximum chroma, called a first cusp color; and pairing from the first color gamut to the second color gamut The color is luma-mapped, where the luma-mapped color is computed from a parabolic function applied to the color that maps the first cusp color to a color with the target luma. Depending on the specific property, the preserved chroma is also obtained; and in cases where the color's chroma is lower than or equal to the preserved chroma, the color of the lightness map is that color, and where the color's chroma is higher than the preserved chroma case, the lightness-mapped color is computed from a parabolic function applied to that color.

Restrictors are disclosed that include a body defining a Venturi tube having a throat defining a junction of a converging inlet cone to a diverging outlet cone along a longitudinal axis thereof, and with the converging inlet cone and the diverging outlet cone each defining an inner passageway that transitions as a hyperbolic or parabolic function toward the throat.

The invention discloses a precise control method of a linear motion module. A motion control method based on S-shaped speed curve planning and synchronous planning of parabolic functions is adopted to precisely control the linear motion module; an acceleration maximum value and a speed maximum value of each motion shaft of a truss manipulator are input; an initial pose and a target pose of the truss manipulator are given to obtain a displacement variation of each motion shaft of the manipulator; time function nodes of each motion shaft are calculated; longest time nodes are selected as unified planning nodes to calculate actual maximum speed and maximum acceleration of each motion shaft; displacement, speed and acceleration functions at an acceleration phase, a deceleration phase and a constant-speed phase are respectively calculated according to the actual maximum speed and the maximum acceleration of each motion shaft; and the displacement of each motion shaft or discrete points on speed curves are output. The method can prevent the manipulator vibration or noise problem caused by sudden change of the speed or the acceleration, guarantees the motor motion precision, and can control the motion trajectory.

The invention proposes a wave direction inversion method for ship-borne coherent microwave radar. This method first estimates the left and right bandwidth boundary frequencies and center frequency of the ocean echo signal from the range Doppler spectrum echoes obtained from multiple irradiation directions of the radar, and then converts the center frequency into velocity and deducts the ship speed component to obtain the water quality. point speed. Then the water particle velocity measured in each direction is converted into a wave number spectrum to synthesize an undirected ocean wave spectrum. Then, the wave value corresponding to the peak is obtained from the undirected wave spectrum by searching for the maximum value, and the wave number energy of the peak in each direction is arranged symmetrically in a circular distribution, and then the fuzzy wave direction is obtained by constructing a parabolic function model. Then, the variance of the left and right bandwidth boundary frequencies corresponding to the maximum irradiation direction of the spectral peak wave number energy is used to eliminate the 180° ambiguity. Finally, combined with the heading of the ship, the wave direction with true north as the reference is obtained. The invention enables the ship-borne coherent microwave radar to have the capability of navigating and monitoring the direction of sea waves.

The invention discloses a method for forecasting the service life of a lead-acid storage battery. The method comprises the steps of: periodically activating the storage battery to obtain an activated charging capacity thereof and thereby obtain a variable point (t, Sc) of each periodically activating time t and the corresponding charging capacity Sc; naturalizing the variable point (t, Sc) obtained after each activation to the corresponding normal capacity point (ti, Sci), wherein i is the number of corresponding periodically activating times; calling a least square method to fit a parabolic function Sc=(i)at( / i)2(i)+bt( / i)+c of the charging capacity Sc and the time t as the forecasting curve for the service life of the storage battery, wherein a, b and c are related coefficients of the parabola. The method for forecasting the service life of the lead-acid storage battery achieves improved forecasting accuracy, and is applicable to various storage batteries and low in forecasting cost; the forecasting method adopts a single parameter for forecasting, thus reducing computation complexity.

The invention discloses a phosphorus pig iron cast negative electrode assembled carbon block. According to an aluminum electrolysis theory and a current distribution demand, two sections of steel sticks and a through long steel stick are selected; negative electrode carbon blocks of the two sections of steel sticks and the through long steel stick are opposite to centre joints of two positive electrodes; a non-conductive material is used for filling; the non-conductive material is used for filling the parts outside the positive projections of the positive electrodes; at a manual leg extension position, advanced shaping is adopted; and the shape is set according to a parabolic function y=x<2>. According to the phosphorus pig iron cast negative electrode assembled carbon block, the current density of the negative electrode is improved by 5 to 7 percent, and the problem that the heat capacity of the phosphorus pig iron cast negative electrode tank is insufficient is solved; the conductivity of the manual extended leg position is gradually reduced from inside to outside, so that an effective furnace upper is formed; and therefore, manual extended leg is protected; and dual purposes of obtaining high energy saving and consumption reduction indexes and prolonging the service life of an aluminum electrolytic cell are realized.