32 results about "Density contrast" patented technology

An exposure value is determined based on a face region, with high accuracy and with less effect of a background region or density contrast caused by shadow. For this purpose, a face detection unit detects a face region from a face candidate region in a through image detected by a face candidate detection unit, by fitting to the face candidate region a mathematical model generated by a method of AAM using a plurality of sample images representing human faces. An exposure value determination unit then determines an exposure value for photography, based on the face region.

A detection system for detecting sheets of material includes a device for moving along a path a container which can harbor a sheet of material sought to be detected; an X-ray scanner having a beam for scanning across the path of the container through a predetermined angle and a device for moving the scanner to shift the origin of the scanning beam to align during at least a portion of the scan the scanning beam with the sheet for producing a high projected density contrasted with its surroundings.

The invention discloses a density contrast automatic liquid discharge valve, including a floating ball with the proportion between the two mixed liquor, a mixed liquor input port and a case of the single liquor discharge port, a lever mechanism and a valve port arranged on the discharge port inside the case, wherein the floating ball controls the open and close of the valve port through the lever mechanism. The invention not only can use the density contrast of different liquids, the floating ball level mechanism designed by the Archimedes principle can control the valve port to discharge the liquid, can discharge the liquid accurately for one liquid of the stable mixed liquid and perform the indicating control.

A gas and liquid segregator of oil gas and automatically discharged vortex is used for oil and gas separation of crude oil. The segregator includes a tank body, the bottom of which is provided with a sewage draining exit, and the middle part of the tank body is provided with an inlet. A cyclone and a gas phase introducing opening are arranged inside the tank body. The segregator is characterized in that an automatically discharging device of air phase is fixed at the top of the tank body; the automatically discharging device of air phase is connected with an air phase discharging pipeline, which is connected with a constant pressure flow-control valve of an air phase outlet. The bottom of the tank body is connected with a liquid phase discharging pipeline, which is connected with an automatically discharging device of liquid phase, and the automatically discharging device of liquid phase is connected with a constant pressure flow-control valve of a fluid phase outlet. The functions of improving the gas and liquid separation effect as well as automatically discharging are achieved, and the automatically discharging devices can be disassembled and is adjustable to fit for the gas and liquid separations of different density contrasts, and the segregator is especially fit for a natural gas production occasion.

The phase contrast microscope includes: an illumination optical system 10 that emits illumination light for phase difference measurement to an observation target placed in a container; an adjustment optical system 20 that is provided between the illumination optical system 10 and the observation target S, has at least one optical element 21, and adjusts refraction of the illumination light due to a liquid surface shape of a liquid C in the container 60; an imaging unit 40 that images the observation target to which the illumination light has been emitted; and an adjustment optical system control unit 51 that adjusts optical characteristics of the adjustment optical system 20 based on uniformity of a density of an image captured by the imaging unit 40 and a density contrast.

The invention belongs to the field of medical image processing and especially relates to a nucleus segmentation method based on white blood cell detection. The method comprises the following steps: to begin with, summarizing the size of diameter of each kind of white blood cell to set a plurality of sizes of sliding windows; then, selecting a candidate window for each sliding window according to gradient information of each white blood cell picture; calculating characteristic value of each candidate window according to the color contrast information, boundary density contrast information and gradient contrast information of the white blood cell pictures, and inputting the characteristic values to an epsilon-SVR model, and selecting a final detection window; intercepting the region of the final detection window of each white blood cell picture as a final positioning subgraph; and then, selecting threshold segmentation nucleus through a subgraph gray statistical chart polynomial curve fitting method, and then, carrying out hole filling and isolated point removal through morphologic processing to enable the segmentation result to be more accurate.

Method for subsurface exploration. In one implementation, the method may include receiving a gamma value at a subsurface interface, wherein the gamma value is a ratio of Vp/Vs at the subsurface interface. Vp is the average P wave velocity and Vs is the average S wave velocity. The method may further include receiving a converted wave reflection coefficient at the subsurface interface. The converted wave reflection coefficient is a function of a density contrast at the subsurface interface and a shear velocity contrast at the subsurface interface. The method may further include determining a P wave incident angle such that the converted wave reflection coefficient is a function of substantially only the density contrast at the P wave incident angle. The P wave incident angle is referred to herein as θ. The method may further include calculating the density contrast based on the converted wave reflection coefficient at θ.

The invention discloses a spiral flow whirlwind gas separator. The spiral flow whirlwind gas separator comprises an outer spiral runner which consists of an outer pipeline (3) and outer spiral blades (2) in the outer pipeline (3), and both ends of the outer spiral runner are respectively provided with an inlet (1) and an outlet. The spiral flow whirlwind gas separator is characterized in that the interior of the outer pipeline (3) is also provided with an inner pipeline (7); the inner pipeline (7) and inner spiral blades (6) arranged in the inner pipeline (7) form an inner spiral runner; the flow directions of gas in the outer spiral runner and gas in the inner spiral runner are opposite; a collecting pipe (8) is arranged at the outlet of the inner pipeline (7) in the inner pipeline (7); and the outlet of the outer pipeline (3) is connected with a conical whirlwind runner (4). Two layers of spiral blades with different sizes and screw pitches are contained in the spiral flow whirlwind gas separator. At a very high spiral speed, the primary separation and the secondary separation of methane and air are realized by utilizing the principle of density contrast between the methane and the air, and finally, the density of gas discharged into the air is reduced, and the purification and the secondary utilization of the gas are realized, and the separation efficiency is high.

A process for geo-sequestration of a water-soluble fluid includes selecting a target water-laden geological formation bounded by an upper formation of low permeability, providing an injection well into the formation and injecting the fluid into the injection well under conditions of temperature, pressure and density contrast selected to cause the fluid to enter the formation and rise within the formation. This generates a dynamic density-driven convection current of formation water which promotes enhanced mixing of the water-soluble fluid with formation water.

Disclosed is a refining and selection method of the mixed metal particles in the high voltage electrostatic field which relates to the mixed metal refining and selection technical field. The invention discloses a refining and selection method, firstly, two or more than two kinds of mixed metal particles with the grain sizes of 0.1mm-3mm are selected, the high voltage direct current power supply of a small-sized high voltage purifying machine is switched on, applied voltage value UA can be selected according to parameters such as densities, radii and radii of the columnar earthing electrodes of the mixed particles, and then the mixture is sent into a feed slot, and refining and selection can be fulfilled under the function of the high voltage electrostatic field. The invention is characterized by simple structure, little energy consumption, no loss during refining, high grade of metal particle refining. The novel method for mixed metal refining is suitable for refining and selection with two or more than two kinds of mixed metals that have certain density contrasts and are particles or can be crashed to particles. The invention is mainly used in metal material recovery field such as disused car and electronic waste recovery.

The invention provides a separation method and device for mixed liquid, and belongs to the technical field of separation of two kinds of liquid. The separation method of mixed liquid comprises the following steps that S1, the mixed liquid which is insoluble mutually is layered, and the layered liquid is set to be liquid A and liquid B; S2, an interface recognizer of which the density is between the liquid A and the liquid B is prepared, wherein the interface recognizer can be prepared from one or more kinds of compound materials; and S3, the interface recognizer is put into the mixed liquid, and according to the own density characteristic of the interface recognizer, the interface recognizer can automatically suspend between the interface of the liquid A and the interface of the liquid B for accurately separating the liquid A from the liquid B in the mixed liquid. The separation method disclosed by the invention can be used for the separation of the mixed liquid which has a density contrast and is insoluble mutually; and through the adoption of the interface recognizer of which the density is between the mixed liquid, the content of the liquid at the lower layer in the pretreated mixed liquid can be accurately recognized.

The invention relates to the map integration field, and specifically relates to a lake automatic selection method and device based on dynamic multi-scale clustering; the method comprises the followingsteps: setting an area threshold according to a target scale, and selecting all lakes with the area greater than the threshold; creating buffer areas for all lakes, and selecting lakes with no bufferarea intersection relation as key holding points of distribution features; using dynamic multi-scale clustering to divide the lake group into areas according to distribution density; finally, employing different selection strategies on different areas (i.e., small lake group). The method can effectively keep the form structure and density contrast of the lake group under different target scales before and after the selection, and the selection result has good rationality; the method can be applied to lake element automatic selection integrated processing of the topographic map under differenttarget scales.

The invention discloses a color laser phototypesetting sheet. Compared with the routine laser phototypesetting sheet, the color laser phototypesetting sheet creatively has a color filter layer and can directly display a color three-dimensional image by exposing a black white image on a laser phototypesetting machine. The color laser phototypesetting sheet as a photosensitive material is suitable for output of three-dimensional light box sheets having various breadths and optical grating spaces, produces three-dimensional images having an excellent three-dimensional feel, definition, color brilliance and density contrast, and satisfies production requirements of high efficiency and a low cost.

This invention relates to a method for preparing a composite material, which comprises the following steps: a) adding the molten Fe-C base alloy and preheated enhancing particles to the permanent mold which is rotated with horizontal shaft in high speed, and forming ring hybrid body after mixing in the eccentric field; b) by the density contrast of enhancing particles and Fe-C base alloy liquid, the enhancing particles will remove outside or inside along the circle, forming the out-shell or core of the composite material and the constructional parts. The thickness of composite layer can be controlled according to the requirement; the enhancing particles are distributed evenly, and its volume fraction can be limited 50-85vol%; the base alloy and its tissue can be designed, and it can be recycle used.

An image display medium capable of providing an image display with less change in the image density, with less change in the uniformness of the density and at stable density contrast even after repetitive rewriting over a long period of time, and an image forming apparatus using the image display medium are provided. The image display medium and image forming apparatus have a pair of facing substrates, at least two kinds of particles sealed in a space between the pair of the substrates in which the at least two kinds of particles have a characteristic that at least one kind of them is positively chargeable and at least one other kind of them is negatively chargeable, and the particles chargeable positively and negatively are of colors different from each other and a charge controller is internally added to one or both of the particles chargeable positively and negatively.

The invention discloses a method for evaluating stability of a replaced interface, comprising steps of obtaining measurement information of multiple flow rate measuring devices arranged at a low side orderly along the flowing direction; according to the measurement information, orderly determining the length increase amount of the corresponding replaced interface corresponding to every flow rate measuring device; determining the stability of the replaced interface according to the length increase of the replaced interface corresponding to the flow rate measuring device. From the view of physical modeling, the method of evaluating the stability when a two-phase fluid replaced interface in the replacement of a horizontal well section is fingered to the low side with positive density contrast; the method can qualitatively evaluate the stability of the replaced interface. The method can be used for evaluating the influence rules of the geological parameter, fluid rheological property, density, displacement, and other parameters on the replaced interface stability; the method is simple and reliable, and strong in operability.