7 results about "Temperature gradient" patented technology

The present invention pertains to a device and method to measure thermo-optical, preferably thermophoretic, characteristics of particles in a solution. The method comprises the steps of: (a) providing a sample probe comprising marked particles in a solution; (b) providing a temperature control system for creating a temperature gradient within said sample probe by contact heating, electrical heating and/or cooling; (c) detecting the marked particles at a first time; (d) creating a temperature gradient within the sample probe by means of the temperature control system; (e) detecting the marked particles in the sample probe at a, preferably predetermined, second time and/or at a predetermined location within the temperature gradient, and (f) characterizing the particles based on said two detections.

The present invention relates to an apparatus and method for growing a high melting point single crystal having a predetermined orientation, which is grown from a culture rod (3) by a floating zone method or a suspension zone method. The device comprises: culture rods (3) and crystal nuclei (4), a strip-shaped resistance heating type heating strip (6) provided with at least one opening is installed between its ends and next to it, and it is heated To the crystal melting temperature, so as to form the melting zone (5), drive mechanism (8, 11), so that relative movement occurs between the heating belt (6) and the crystal nucleus (4) and the culture rod (3) that are installed next to the heating belt , the molten liquid material of the culture rod (3) is obtained through each opening of the heating belt, and causes single crystal growth on the crystal nucleus (4) by cooling, and another heating device (15, 16), which is arranged at the melting The vicinity of the zone (5) in order to set the temperature gradient within the range of the melting zone (5). In order to reduce the temperature gradient in the melting zone, said further heating device (15, 16) comprises at least one heating coil (17, 19), which is driven with radio frequency, wherein the heating strip (6) and the respective heating coil are thus mounted opposite each other (17, 19) so that radio frequency radiation is coupled on the heating strip in order to generate an additional inductive heat input in the heating strip and to set a temperature gradient across the melting zone (5). This enables an inductive heat input into the heating strip, which can be varied or varied in a targeted manner.

The invention discloses a reverse flow combustor and a double-wall elbow structure thereof and relates to the field of aero-engines. The double-wall elbow structure comprises an inner elbow wall and an outer elbow wall; in the flowing direction of fuel gas, the inner elbow wall is divided into an upper inner elbow wall section and a lower inner elbow wall section, cooling structures of the two regions are different, the upper inner elbow wall section is provided with multiple rows of diverging holes, besides the fact that certain included angles are formed between the diverging holes and the wall of the upper inner elbow wall section, certain deflection included angles are formed between the diverging holes and the flowing direction of the fuel gas, and compound angles are formed; the lower inner elbow wall section is provided with a plurality of rows of diverging holes, certain included angles are formed between the diverging holes and the wall of the lower inner elbow wall section, and deflection included angles are not formed; and the inner elbow wall is sleeved with the outer elbow wall, a middle cavity is formed between the inner elbow wall and the outer elbow wall, and impactholes are formed in a shell of the outer elbow wall. By means of the elbow structure, the peak wall temperature at the start section of the inner elbow wall and the wall temperature gradient of an elbow can be effectively reduced, and therefore the strength of the elbow is improved, and the service life of the elbow is prolonged.

The present invention relates to apparatus, systems and methods for generating a subpopulation of spermatozoa enriched for capacitated spermatozoa, by exposure of a population of spermatozoa to a suitable temperature gradient, and retrieving the enriched subpopulation of spermatozoa for further applications, such as, for diagnosis or fertility treatments.

The invention discloses an adaptive compensation device for horizontal imaging field pitch angle of laser radar. The adaptive compensation device comprises: a metal frame; a turntable fixed to the metal frame; a spindle having one end fixed to the turntable through a fixing point and configured to be capable of rotating around the fixing point, wherein the upper portion of the other end of the spindle is configured to hold a laser, and the spindle is used for rotating to adjust imaging field pitch angle of the laser; a thermal expansion rod having the upper end fixed to the metal frame and thelower end abutted to the spindle, wherein a thermal expansion coefficient of the thermal expansion rod is greater than that of the metal frame; a spring having two ends fixed between the lower portion of the other end of the spindle and the metal frame. The metal frame and the thermal expansion rod have a great thermal expansion coefficient difference; upon a temperature change, deformation of the thermal expansion rod may push the spindle so as to drive a laser beam emitted by the laser on the spindle to rotate opposite to a displacement of the pitch angle, and thermo-optic drift due to temperature gradient is adaptively compensated.

The invention relates to an arsenic-lead mixed vapor graded condensing device and an application method thereof, and belongs to the technical field of alloy separation equipment. The device comprisesa vacuuming device, a flange, temperature measuring devices, a grading vacuum furnace body, a quartz tube, a push rod, a control cabinet, a heating zone and a recovery foil. The length of the quartz tube is 1.2 to 2 m; the length of the heating zone It is 0.15-0.25m; the quartz tube is respectively provided with the temperature measuring device every 2-3cm. The device forms a certain temperature gradient in the quartz tube, so that materials condense in corresponding temperature ranges, the purpose of high-efficiency separation can be achieved; the application method is simple in process.

The invention discloses a novel high-birefringence polarization maintaining optical fiber capable of maintaining random polarization and a manufacturing method thereof. The optical fiber is provided with a fast axis and a slow axis, as well as a fast axis-slow axis 0-degree butted transitional surface, wherein the optical fiber is divided into optical fiber sections by the transitional surface; the length of each optical fiber section is less than the reciprocal value of the gradient of a spatial temperature field in which the optical fiber section is positioned along the light propagation direction of the optical fiber and is simultaneously within the length range of the reciprocal value of temperature gradient of the optical fiber; and difference between the length sum of the optical fibers with odd serial numbers and the length sum of the optical fibers with even serial numbers ensures that the optical path difference between two axial components of light is less than the coherence length. The optical fiber can be obtained by changing the position of a stress application region in an optical fiber drawing process, and can also be manufactured by bisecting an existing high-birefringence polarization maintaining optical fiber and then performing fusion splicing on the optical fiber sections by adopting fast axis-slow axis butt joint. The polarization maintaining optical fiber disclosed by the invention can be used for maintaining the polarization in a random polarization state, and can realize a communication channel for Robus polarization maintaining by virtue of auxiliary equipment.