37results about How to "Good physical isolation" patented technology

The present invention is an imaging system for detecting concealed objects on an individual. The imaging system includes an imaging zone that is illuminated with millimeter wave energy. A plurality of millimeter wave cameras are focused to fully surround the imaging zone and have the ability to detect millimeter wave frequencies reflected from the imaging zone. As an individual passes through the imaging zone the plurality of millimeter wave cameras detect concealed objects by identifying differences in the millimeter wave energy reflected by the individual's body and a concealed object. A composite image is generated by a central processing unit and displayed on a monitor showing the concealed object on the individual through optical contrast.

The invention discloses a method for generating a liquid droplet array on a microfluidic chip, and relates to the field of liquid droplet generation. The method for generating the liquid droplet arrayon the microfluidic chip includes the following steps that an upper chip and a lower chip are assembled to an initial position, and a fluid pipeline of the upper chip partially or completely covers amicrowell array of the lower chip; a solution is injected into the chip, and the solution partially or completely fills the microwell array of the lower chip; the upper chip and the lower chip are relatively moved to the liquid dividing position, the fluid pipeline of the upper chip and the microwell array of the lower chip no longer overlap, and the solution is dispersed in the microwell array to form the liquid droplet array. The contact surface between the upper chip and the lower chip is hydrophobic, and the microwell array fully physically isolates the generated liquid droplets to avoidcross-contamination. According to the method for generating the liquid droplet array on the microfluidic chip, the device and operation of liquid droplet generation are simplified, the design is flexible, and the size and shape of the generated liquid droplets can be effectively controlled.

The invention provides a novel two-section type seven-phase permanent magnet fault-tolerant motor and belongs to the technical field of permanent-magnet synchronous motors. The motor comprises a motor shell, two rotor assemblies, two stator assemblies, a rotary shaft, a bearing, a bush, an insulating sleeve, a magnet isolating board and an end cover. The two stator assemblies and the two rotor assemblies are coaxially installed on the same shell. The two stator assemblies are a three-phase winding and a four-phase winding respectively and connected with the rotary shaft through the rotor assemblies respectively, so that a three-phase permanent magnet fault-tolerant motor section and a four-phase permanent magnet fault-tolerant motor section are formed. The magnet isolating board is installed between the two motor sections. Phase windings of the stator assemblies are in a concentrated single-layer winding mode and are embedded separately through teeth. Power is supplied to each phase winding through an independent H-bridge driving mode. The novel two-section type seven-phase permanent magnet fault-tolerant motor is good in physical isolation capacity, magnetic field isolation capacity, thermal field isolation capacity and electric isolation capacity and can effectively restrain short circuit currents of the permanent magnet motor, greatly improve the reliability of the permanent magnet motor and satisfy the requirements for primary fault work, secondary fault work and third fault safety.

Compositions are disclosed for dewatering mixtures of petroleum and water. The compositions comprise one or more of the following: an unreacted polysaccharide component; and one or both of a polysaccharide component reacted with a hydrophilic component and a polysaccharide component reacted with a hydrophobic component. The compositions may also include viscosifying agents or stabilizers to stabilize the compositions against separation, for example, prior to use. In particularly preferred embodiments the invention is drawn to compositions for breaking an emulsion; such compositions comprising a carbohydrate component containing a cationic starch joined to a hydrophobic moiety, providing the carbohydrate component oil solubility. The composition may optionally comprise one or more additional demulsifier selected from, without limitation, salts (such as a polyaluminum chloride, an aluminum chlorohydrate, an alum, etc.), metal salts (such as iron and zinc salts), dithiocarbamate, tannin, and organic demulsifiers such as poly-DADMAC and similar compounds.

The invention discloses a nano flame-resistant concrete protective coating and a preparation method thereof, wherein the protective coating comprises the following ingredients in parts by weight: 55-75 parts of modified nano-silica sol emulsion, 8-10 parts of attapulgite whiskers, Schiff base modified 3-5 parts of non-toxic graphene compound, 0.2-0.5 parts of wetting and dispersing agent, 0.2-0.5 parts of thickener, 0.2-0.5 parts of defoamer, 1-3 parts of leveling agent, 25-35 parts of deionized water . The preparation process is as follows: mix the modified nano-silica sol emulsion, attapulgite whiskers, and Schiff base modified graphene compound according to the above protective coating formula, and use a high-speed disperser to stir and disperse at high speed for 30-60min; then the above protective coating Add the remaining wetting and dispersing agent, thickener, defoamer, leveling agent, and deionized water to the formula; adjust the state of the high-speed disperser to medium-speed stirring and dispersing, continue stirring evenly, and then filter and pack. The protective coating provided by the invention has good physical and chemical properties such as alkali resistance, water resistance, weather resistance, adhesion, fire resistance and the like.

The invention relates to the technical field of lithium ion batteries, and discloses a high-voltage-resistant electrolyte interface layer and its in-situ preparation method and application. The preparation method of the present invention includes the following steps: (1) uniformly mixing fluorine-containing acrylate monomers and lithium salts to form a precursor; (2) assembling the precursor, positive electrode, negative electrode and electrolyte matrix into a battery, the precursor It is arranged between the electrolyte matrix and the positive electrode material; (3) the battery is charged to polymerize the acrylate monomer, and the precursor is solidified into a polymer electrolyte layer to obtain a high-voltage resistant electrolyte interface layer. The invention uses an electrochemical polymerization method to complete the polymerization during the charging process without secondary assembly, thereby solving the technical problems of poor contact and further formation of a space charge layer and increase of contact resistance.

The invention provides a mid-wave infrared optical system, which solves the problem of temperature field measurement in nuclear reactors. The mid-wave infrared optical system includes an anti-pollution protection window, an imaging group, a relay mirror group, a correction mirror group and a detector assembly. The light emitted by the optical system is imaged by the imaging group, the image surface of the imaging group is coupled to the object surface of the correction group through the relay mirror, the imaging quality is adjusted by the correction mirror group, and the imaging information is collected by the detector component: wavelength range The diameter is 3.7um~4.8um, the field of view is 50 degrees, the diameter of the entrance pupil is 6.78mm, the F-number of the system is 2, and the total length of the system is 1770mm. In addition to the detector assembly, a total of 12 lenses are used, of which 10 aspherical surfaces are used on 4 surfaces. The mid-infrared optical system of the present invention has the advantages of easy processing, easy assembly and adjustment, small lens diameter, good imaging quality and the like.