35results about How to "Overcome preparation difficulties" patented technology

The invention relates to a gear overall error measuring device and method, belonging to the technical fields of precision testing technology, instruments and mechanical transmission. The invention uses a single-tooth measuring gear as a measuring element to realize rolling point scanning measurement of all teeth of gears to be tested with different specifications. Through the sensor, the angular displacement signal generated by the single-tooth measuring gear and the gear under test during the transmission process is converted into an electrical signal, which is input into the computer after the pre-processing circuit and the data acquisition card, and the four-dimensional information of the gear under test is obtained through analysis, calculation and data processing. It can display and print the error results and error curves. The invention uses the same measuring gear to complete the measurement of the measured gears with different specifications, and realizes the flexible measurement of the overall error of the gear. The single-tooth measuring gear is easy to manufacture, low in cost, high in precision and wide in application range, which ensures the measurement accuracy and expands the measurement range.

The invention belongs to the technical field of composite material preparation, and relates to a method for preparing a shell-like light-weight high-strength composite material. The specific method is (1) using leaf-shaped amorphous-crystalline heterogeneous manganese dioxide nanosheets prepared by a redox method and Hummers Graphene oxide obtained by the oxidation method is used as the main building unit, combined with a small amount of biological macromolecules, and a high-strength composite film material is prepared by evaporation-induced self-assembly method; (2) A large number of composite film materials are brushed with a cross-linking agent layer by layer Assembled into one body, combined with hot pressing process to obtain light weight and high strength block layered micro-nano composite material. The preparation process of the invention is simple and convenient to operate, and the process is green and environment-friendly, and the strength of the finally prepared bulk composite material is far superior to most other graphene oxide-based bulk composite materials.

The invention discloses a method for preparing Naratriptan [N-methyl-3- (1-methyl-4-piperidine)-1,4-indole-5-ethyl thiamine], employing 5-halogenated indole as start raw material, through cyanation, reduction, condensation with N-methyl methanesulfonamide, hydrogenation for reduction, condensation with N-methyprylone, and again hydrogenation for reduction to get the target compound. The invention is characterized by the designation of the synthetic Naratriptan course of easy-to-get raw amterial and low operating cost, overcoming the shortcomings of hard preparation of raw material and high operating cost in current technology.

The invention discloses a method for preparing a Zn-doped p-type beta-Ga2O3 nanowire according to a chemical vapor deposition method. The method provided by the invention comprises the following steps: carrying out evaporation to form a metal catalyst layer which is 1-50 nm thick on a cleaned substrate; sufficiently mixing a Ga source and a Zn source according to a certain mass ratio to prepare a reaction source material; putting the reaction source material and the substrate on which the metal catalyst layer is formed through evaporation into a quartz boat, and then putting the quartz boat into a high-temperature heating zone in a chemical vapor deposition system growth chamber, wherein the substrate is positioned in the downstream direction of gas flows and 1-2 cm away from the reaction source material, injected high-purity argon gas is carrier gas, and the argon gas flux is 50-500 ml / min; when the heating temperature reaches 600-1100 DEG C, injecting oxygen and keeping the oxygen flux of 1-5 ml / min for 15-30 minutes; stopping the oxygen injection, keeping the argon gas flux, cooling to 100 DEG C and below, and taking out an obtained sample.

The invention discloses an ultra-low threshold multi-component holmium ion-doped glass material, the molar composition of the glass material is expressed as: 72TeO 2 ‑20ZnO‑5Na 2 CO 3 -2Y 2 o 3 and doped with Ho at a concentration of 1 mol% 3+ ion. The invention also provides a preparation method and a control method of a microsphere cavity laser based on an ultra-low threshold multi-component holmium ion-doped glass material. The surface of the microsphere cavity prepared by the invention is perfect, has a very high Q value, the threshold value of the produced laser is extremely low, and the coupling efficiency is greatly improved, which effectively solves the problems of low output power and low collection energy efficiency of the whispering gallery mode microcavity laser, and can be used Mid-infrared fiber microcavity lasers for high-efficiency, low-threshold narrow-bandwidth fibers.

The invention belongs to the field of pharmaceutical chemicals and discloses a new method for combining ethyl sulfonamide; in the invention, indoline is used as starting material, and the target compound: N-methyl-1H-benzpyrole-5-ethyl sulfonamide is obtained by the steps of benzyl protection, formylate, condensation with N-methyl methanesulfonamide, hydrogenation reduction, debenzyl and oxidation and the like; in the combining route, the raw material is easily to obtain, the process is simple, the yield is high, the operation is convenient, the environment is friendly, the disadvantages thatthe raw material preparation is difficult and the regent cost is overhigh in the prior art are overcome, and the method has industrial application value.

Provided is a split type single-tank solid accumulation bed heat storage system. A split type solid accumulation bed heat storage tank of the system is formed by stacking a top conical heat storage tank body (1), multiple split type cylindrical heat storage tank bodies and a bottom conical heat storage tank body (16) in parallel in the height direction. The two conical heat storage tank bodies (1 and 16) are connected with the split type cylindrical heat storage tank bodies through flanges (12). A fluid inlet pipeline (2) and a fluid outlet pipeline (17) are mounted on the upper portion of the top conical heat storage tank body (1) and the lower portion of the bottom conical heat storage tank body (16) respectively. A current equalizer (7) is mounted at the bottom of the top conical heat storage tank body (1), and the bottom of each split type cylindrical heat storage tank body is provided with a porous supporting grate (11). Solid heat storage materials are supported by the supporting grates (11) so as to be accumulated in the split type cylindrical heat storage tank bodies to form a porous bed body, and a heat transfer fluid channel is formed. The heat storage materials in the split type cylindrical heat storage tank bodies are different, and the accumulation modes are different.

The invention provides an activation method for a nitrogen-doped ZnO acceptor, belonging to the semiconductor material field and particularly taking the radio frequency plasma metal-organic chemical vapor deposition (MOCVD) technique as the late-annealing technique of the nitrogen-doped ZnO. The invention aims to overcome the defect that the nitrogen-doped p type ZnO is hard to acquire and provides a method that by utilizing the radio frequency plasma annealing technique, the nitrogen-doped ZnO undergoes the high temperature annealing in the nitrogen oxide plasma, thereby obtaining the highlyefficient and stable p type ZnO doping; because nitrogen and oxygen which are high in activity are formed in the atmosphere, the escape of the nitrogen in the nitrogen-doped ZnO can be prevented, andsimultaneously the desorption of the oxygen in the ZnO can also be prevented, and simultaneously the nitrogen acceptor in the nitrogen-doped ZnO is activated, thereby realizing the preparation of thep type ZnO and further realizing the preparation of an pn junction LED device of the ZnO.

The invention provides a large-diameter liquid crystal lens array adopting a composite dielectric layer. The liquid crystal lens array comprises an upper substrate, a common electrode, a high dielectric layer, a liquid crystal layer, the composite dielectric layer, a pixel electrode and a lower substrate from top to bottom. The liquid crystal layer is prepared from a nematic liquid crystal material. The upper substrate and the lower substrate are glass substrates with plane-transparent electrodes. The composite dielectric layer comprises the high dielectric layer and a protruding material layer, and the two materials are mutually dissolved. A set of complete technological production process is provided for the composite dielectric layer. Accordingly, a large-diameter liquid crystal lens array with the diameter at the millimeter level can be produced, and meanwhile the manufacturing process difficulty and the production cost of a liquid crystal lens are lowered.

The invention provides a droplet whispering gallery mode laser and a manufacturing method thereof. The first single-mode fiber with a tapered area in the middle is connected to the pump light source and the spectrometer respectively, and the second single-mode fiber is respectively connected to the capture light source and the ring-core fiber. The laser beam is injected into the core of the ring-core fiber through the second single-mode fiber, and the light is totally reflected and refracted at the inclined surface of the ring-core fiber's frustum-shaped fiber tip, and a ring-shaped converging light field is formed near the cone-shaped fiber tip to realize the function of optical tweezers , the optical tweezers stably capture the micro-droplets, and the captured liquid crystal micro-droplets are brought close to the taper of the first single-mode fiber, the pump light source is injected from the front end of the first single-mode fiber, and the spectrometer is detected at the rear end of the first single-mode fiber excited laser. In the present invention, a high-Q droplet microsphere cavity with a perfect surface is formed by surface tension, and the optical tweezers stably control the droplet microsphere, and the droplet whispering gallery mode laser has an extremely low threshold.