40results about How to "Increase logarithm" patented technology

The invention relates to a bidirectional conjugate tooth profile design method for harmonic gear drive. The bidirectional conjugate tooth profile design method for harmonic gear drive comprises the steps of firstly, expressing a flexible wheel top-section convex tooth profile coordinate through a parameter equation, converting to a rigid wheel coordinate system, solving to obtain discrete point coordinates of a theorical conjugate concave tooth profile and a concave tooth profile of a flexible wheel top-section convex tooth profile, determining the working tooth depth of a rigid wheel tooth profile through least square fit, determining a fitted curve section to be a rigid wheel bottom-section concave tooth profile and a rigid wheel top-section concave tooth profile, and calculating to accomplish a tooth profile design of a rigid wheel; and then expressing a rigid wheel top-section convex tooth profile coordinate through a parameter equation, converting to a flexible wheel coordinate system, solving to obtain discrete point coordinates of a theorical concave conjugate tooth profile in a flexible wheel bottom-section range, determining the tooth depth of a flexible wheel through least square fit, determining a fitted curve to be a flexible wheel bottom-section concave tooth profile, and calculating to obtain a flexible wheel working tooth profile. According to the bidirectional conjugate tooth profile design method for harmonic gear drive provided by the invention, the flexible wheel tooth profile and the rigid wheel tooth profile with bi-conjugate and secondary-conjugate phenomena are directly obtained, so that a conjugate contact area and a meshing zone are increased, the tooth surface contact stress is reduced, and the drive accuracy of a harmonic reducer is improved.

The invention provides a thermal resistance-type thin film thermopile-type transient heat flow meter and a manufacturing method. The heat flow meter comprises a ceramic substrate, and a positive thermocouple, a negative thermocouple, a thermocouple connection layer, an outer thermal resistance layer and an inner thermal resistance layer arranged on the ceramic substrate, wherein the positive thermocouple and the negative thermocouple are in butt joint via the thermocouple connection layer; the outer thermal resistance layer and the inner thermal resistance layer cover the positive thermocouple and the negative thermocouple; when an external environment applies heat flow in a vertical direction to the heat flow meter, the outer thermal resistance layer and the inner thermal resistance layer have different thicknesses, the positive thermocouple and the negative thermocouple are connected to form hot and cold junctions, a temperature difference exists between adjacent two hot and cold junctions, corresponding electric potential output exists according to Seebeck effects, and the output electric potential is related to the heat flow density. Transient measurement on the heat flow density can be realized, and the thermal resistance-type thin film thermopile-type transient heat flow meter has the advantages of simple structure, small size, few influences on a measured field, quick response speed, large measurement temperature range and high measurement precision.

A light emitting diode (LED) chip electrode structure capable of promoting transverse current diffusion and with dual reflection surfaces relates to the technical field of production of an LED chip. The LED chip electrode structure comprises trapezoid structured electrode expansion bars which upwards and sequentially wrap the surface layer of a GaN layer, wherein each trapezoid structured electrode expansion bar comprises a Cr layer, a first Al layer, at least one pair of TiN/Pt layers, an Au layer, a second Al layer and a TiN outer layer. With the electrode structure disclosed by the invention, the transverse current diffusion can be increased, and an effect of multi-surface reflection of light can be achieved.

The invention provides a transient temperature and thermal flux simultaneous measurement sensor and a preparation method thereof. The sensor comprises a ceramic substrate and positive electrode thermocouples, negative electrode thermocouples, thermocouple connecting layers, a thermal resistance layer, a positive electrode thermocouple lead end, a negative electrode thermocouple lead end, a positive electrode thermopile lead end and a negative electrode thermopile lead end which are arranged on the ceramic substrate; the positive electrode thermocouples and the negative electrode thermocouples are connected in a butt-joint mode through the thermocouple connecting layers, one positive electrode thermocouple and one negative electrode thermocouple is connected into a thermocouple pair in series, multiple thermocouple pairs are connected end to end in a lap-joint mode to form the thin-film thermopile, and the thermal resistance layer is arranged over a freezing point of the thermopile in a covering mode; when an external environment applies vertical thermal flow to the sensor, a heating point and the freezing point of the thin-film thermopile has a temperature difference, corresponding potentials are output according to a Seebeck effect, output of the heating point of one thermocouple pair of the sensor is related to the temperature, and the output potential of the thermopile is related to the thermal flux. The sensor can achieve transient measurement on the temperature and the thermal flux and has the advantages of being high in response speed, wide in measurement temperature range, high in measurement precision, capable of achieving simultaneous measurement on the temperature and the thermal flux and the like.

The invention relates to the field of instant food, in particular to an instant two-layer food forming method. The instant two-layer food forming method comprises the following steps: 1) pressing a wrapper and cutting the wrapper into a plurality of slender flour tapes; 2) conveying uncooked or cooked stuffing to the position of the flour tapes; 3) feeding the stuffing to one side of the flour tapes, wherein an angle formed between the stuffing conveying path and the plane of the flour tapes is 45-135 degrees when the stuffing is fed to the flour tapes; 4) firstly pushing the other side of the flour tapes into forming holes of an outer forming template and an inner forming template, wherein the middle portions of the flour tapes wrap the stuffing at the moment to realize preliminary forming; 5) sealing the portions, which wrap the stuffing, of the flour tapes and simultaneously performing pattern printing forming to the flour tapes with sealed portions; 6) placing the formed instant two-layer food on a conveying belt for conveying. By improving the included angle between the stuffing and the flour tapes when the stuffing is filled into the flour tapes, the situation that the stuffing cannot be put in the flour tapes is avoided, the contact surface between the stuffing and the flour tapes is larger, the integrity of the stuffing is better, the stress surface of the flour tapes is larger and the flour tapes are prevented from being damaged.

The present invention relates to a PCR method of multiple primer, its reaction liquid and its application in preparation of microbial detection reagent, specially relates to that in PCR process two denaturation temp. of 92-97 deg.C and 65-87 deg.C are adopted to respectively make initial 2 or 3 circulation or other subsequent circulation so as to overcome the defect of existent multiple PCR which can form non-specific product. Said invention utilizes the proper product design and adoption to two denaturation temperatures so as to obviously reduce the possibility of that non-target product early-synthesized by PCR can participate in subsequence. Said invention is applicable to preparation of single-tubule multiple PCR quick detection reagent, and has extensive application for detecting various viruses.

The invention discloses a flexible power supply watchband formed by multiple thermoelectric modules, and a making method thereof. The flexible power supply watchband is formed through connecting at least one segment of a power supply watchband having a large density, formed by equidistantly arranged thermoelectric modules and arranged in the middle with power supply watchbands arranged at two sides of the middle power supply watchband(s), having the same small density and formed by equidistantly arranged thermoelectric modules; and every power supply watchband formed by the thermoelectric modules sequentially comprises a heat conduction layer, a flexible printed circuit board provided with a thermoelectric module and a plurality of heat dissipating layers from the wrist wearing surface to the outside, every thermoelectric pair in every thermoelectric module on the upper surface of the flexible printed circuit board is arranged in every rectangular through hole of a corresponding watchband main body, every thermoelectric pair is connected with the corresponding heat dissipating layers through a cold end copper conductive sheet, and the heat dissipating layers are positioned outside the corresponding watchband main body. The flexible power supply watchband improves the quantity of the thermoelectric pairs in the thermoelectric module on the premise of guaranteeing the application of the power supply watchband to the contour of the wrist, and improves the output drive capacity of the power supply watchband. The watchband main bodies are made of polydimethylsiloxane, so the flexible power supply watchband has a good flexibility, and is suitable for different arm surfaces.

The invention relates to an organic electroluminescent device and a preparation method thereof, wherein the organic electroluminescent device has a layered structure and comprises an anode conductive substrate, a first hole injection layer, a first electron injection layer, a second hole injection layer, a hole transport layer, a green light emitting layer, an electron transmission layer, a second electron injection layer and a cathode layer; wherein the anode conductive substrate, the first hole injection layer, the first electron injection layer, the second hole injection layer, the hole transport layer, the green light emitting layer, the electron transmission layer, the second electron injection layer and the cathode layer are successively laminated. The first hole injection layer and the second hole injection layer are made of hole injection material and p-type material which is doped into the hole injection material. The first electron injection layer and the second electron injection layer are made of electron injection material and n-type material which is doped into the electron injection material. According to the organic electroluminescent device, through the added second hole injection layer and the second electron injection layer, working voltage can be reduced and luminous efficiency can be improved effectively.

The invention relates to an organic electroluminescent device and a preparation method thereof, wherein the organic electroluminescent device has a layered structure and comprises an anode conductive substrate, a first hole injection layer, a hole transport layer, a blue light emitting layer, an electronic transmission layer, a first electron injection layer, a second hole injection layer, a second electron injection layer and a cathode layer; wherein the anode conductive substrate, the first hole injection layer, the hole transport layer, the blue light emitting layer, the electronic transmission layer, the first electron injection layer, the second hole injection layer, the second electron injection layer and the cathode layer are successively laminated. The first hole injection layer and the second hole injection layer are made of hole injection material and p-type material which is doped into the hole injection material. The first electron injection layer and the second electron injection layer are made of electron injection material and n-type material which is doped into the electron injection material. According to the organic electroluminescent device, through the added second hole injection layer and the second electron injection layer, working voltage can be reduced and luminous efficiency can be improved effectively.

The invention provides an epitaxial structure and an epitaxial growth method thereof, and an LED chip, the epitaxial structure comprises a substrate, an N-type covering layer epitaxially grown on the substrate, and a multi-quantum well layer epitaxially grown on the N-type covering layer, and the multi-quantum well layer comprises a plurality of pairs of quantum well layers and quantum barrier layers which alternately grow; wherein the Si doping concentration of the N-type covering layer is greater than 3e17, and the logarithm of the quantum well layer and the quantum barrier layer is increased along with the increase of the Si doping concentration of the N-type covering layer. Besides, by increasing the Si doping concentration of the N-type covering layer, the carrier concentration of the N layer is improved, so that under the same condition, the carrier migration probability is increased, and the recombination efficiency of the epitaxial PN junction is improved. Besides, along with the increase of the doping concentration of the N-type covering layer, the number of pairs of barriers and wells of the multi-quantum well layer is increased synchronously, the limit of carrier overflow is improved, the light intensity saturation value is increased, and therefore the brightness of the chip can be higher under the same manufacturing process.

The invention provides a TE-cooler MOSFET (Metal Oxide Semiconductor Field Effect Transistor) structure as well as a preparation method and an adjustment method thereof. The TE-cooler MOSFET structurecomprises an N-type substrate, a TE-cooler P/N structure, a P well, a gate oxide layer, a field oxide layer, an interlayer dielectric, a metal layer, a first passivation layer, a drain layer and a second passivation layer. According to the TE-cooler MOSFET structure provided by the invention, the TE-cooler structure is arranged on the MOSFET structure, so that the heat conduction and heat dissipation effects of the MOSFET are greatly enhanced; in addition, the refrigerating capacity of the TE-cooler structure can be adjusted by increasing the logarithm of a TE-cooler device or reducing resistance or adjusting current, and the TE-cooler structure is more convenient to use.

The invention discloses a filtering unit applied to color imaging, which is characterized in that a dye film layer is arranged on the upper surface of a multilayer film interference filtering structure, and the dye film layer doubly absorbs incident and reflected non-transmission light rays. In addition, the invention further discloses a wide-spectrum color filter chip integrated with the filter unit and a preparation method of the wide-spectrum color filter chip, the filter chip solves the contradiction between high transmittance and low cut-off transmittance of a traditional dye filter film, and application of a multilayer film interference filter structure to the field of color imaging and display becomes reality.

A porous distributing valve for continuous adsorption exchange equipment comprises a turning disc, a fixed disc, fixed valves and movable valves, wherein the turning disc is coaxially and rotationally arranged relative to the fixed disc; the fixed valves are fixed on the turning disc; the movable valves are arranged on the fixed discs in a sliding manner; the number of the fixed valves and the number of the movable valves are the same, and the fixed valves and the movable valves are arranged in pairs; the fixed valves are matched with the movable valves paired with the fixed valves in arrayment and mounting angle; and movable water passing plugs, which are matched with one another and used for self-sealing, are arranged at one ends, which are in abutting joint with the movable valves, of the fixed valves. The porous distributing valve has a simple structure and low cost, and the cost is only one third of that of equipment from abroad; since runners on columns are independently sealed,the defect that a large-diameter planar sealing pad is easy to wear is overcome; columns have more combination forms, and can be used for treating several different leaching liquors simultaneously; the transmission and the control are simple, and the energy consumption is low; and the maintenance and the repair are simple, and the operation cost is low.

The invention discloses a high-speed photoelectric detector structure. An epitaxial wafer of the high-speed photoelectric detector structure comprises an InP substrate, a lower ohmic contact layer, a lower window layer, an absorption layer, an upper window layer and an upper ohmic contact layer, the lower ohmic contact layer, the lower window layer, the absorption layer, the upper window layer and the upper ohmic contact layer sequentially grow on the InP substrate from bottom to top, the epitaxial wafer is a mesa structure, and one side surface of the mesa structure is a light incident surface. The incident surface is provided with an antireflection film, the other side surface far away from the antireflection film is a light reflection surface, and the light reflection surface is provided with a high reflection film. A light incident direction of a photodetector is perpendicular to the direction of a drift electric field, the absorption layer is 0.1-3 mu m, the drift of carriers is fast, and a bandwidth is high. While the internal quantum efficiency is improved, the size of the device is further reduced, the bandwidth of the device is improved, the uniform distribution of a photocurrent of the whole absorption layer is balanced, and the problem of nonlinear distortion of signals caused by uneven light absorption of the absorption layer and local photocurrent saturation is avoided.