10results about How to "Controllable diameter" patented technology

The application relates to a sodium titanate nanofiber / reduced graphene oxide composite electrode material and a preparation method and application thereof. The composite electrode material has a two-dimensional sheet structure, the particle size is 1-6 mu m, the thickness is 10-20 nm, is composed of a few-layer reduced graphene oxide and sodium titanate nanofibers with a diameter of 5-10 nm loaded on the reduced graphene oxide, and is prepared by taking the few-layer reduced graphene oxide as a template, uniformly loading titanium dioxide particles, and then carrying out hydrothermal treatment in an alkali solution. Compared with the prior art, the synthesis method is simple in process, easy to scale up, and high in controllability. As a negative electrode of a sodium ion battery or a positive electrode of a sodium battery, the sodium titanate nanofiber / reduced graphene oxide composite electrode material has the advantages of high initial coulomb efficiency, low working voltage, high capacity, excellent rate characteristics and cycle stability, and has a broad market application prospect.

The application relates to a doped optical fiber preparation process and discloses a high-uniformity and high-concentration Pr 3+ The application discloses a preparation method of a doped quartz-based glass optical fiber. Rare earth oxide Pr2O3, silica powder SiO2 and aluminum oxide Al2O3 are weighed, mechanically mixed, ball milled, dried, sieved, pre-sintered to be transformed into cristobalite, drawn into a glass rod containing a core by using a tube melting method, and processed to remove the outer cladding of the glass rod to obtain a core rod with adjustable diameter. The tube rod method is combined with a high-purity quartz tube to form an optical fiber preform rod. Finally, the optical fiber preform rod has high uniformity, low loss and high concentration of Pr 3+ The application discloses a drawing method of a doped quartz optical fiber. The aluminum oxide Al2O3 is introduced to improve the solubility of the rare earth ion Pr 3+ in the quartz glass and reduce the melting point of the quartz raw material. The rare earth doping concentration is adjustable. The raw material is transformed into cristobalite by pre-sintering, and the effect of reducing the bubbles of the core glass and improving the uniformity of the core glass is remarkable by combining the vacuum tube melting method.

The invention discloses a preparation method of a nuclear-grade zirconium-niobium intermediate alloy wire. The zirconium-niobium intermediate alloy wire consists of the following components in percentage by mass: 15-75% of Nb and the balance of Zr and inevitable impurities. The method comprises the following steps that firstly, sponge zirconium and a niobium block are subjected to vacuum self-consuming electric arc melting, and a bar billet is obtained through forging; secondly, the bar billet is rolled at the temperature of 850-950 DEG C through a rolling mill, and after annealing is conducted under the argon condition, scalping and cold rolling are conducted to obtain a wire billet; and thirdly, the wire blank is scalped, intermediate vacuum annealing and polishing are conducted in multi-pass cold drawing, and the zirconium-niobium intermediate alloy wire is obtained. According to the method, the Nb element content of the zirconium-niobium intermediate alloy and the rolling temperature of the rolling mill are controlled, the process of combining cold rolling and multi-pass cold drawing is adopted, alloy flowing on the surface of the wire and alloy flowing on the core can be synchronous and uniform, the zirconium-niobium intermediate alloy wire with good quality is obtained, and the method is suitable for the technical field of metal material machining.

The invention discloses high-dispersion non-oxidation superfine nanoparticles and a preparation method thereof, and belongs to the technical field of powder metallurgy. The preparation method comprises the following steps: loading micron-sized metal particles or micron-sized silicon particles on a carbon substrate to obtain a precursor A, then controlling parameters of carbon thermal pulses to achieve the purpose of adjusting the diameter, dispersity and oxidation degree of the nanoparticles, and finally forming the non-oxidation spherical nanoparticles with adjustable diameter and good dispersity.

The invention discloses an oil cylinder type internal pressure loading device and method for a circular lining internal pressure test, the oil cylinder type internal pressure loading device comprises multiple groups of radial loading units, a mounting seat and a hydraulic control system, the radial loading units are divided into first loading groups and second loading groups which are alternately arranged at intervals, each first loading group comprises a first oil cylinder and a first arc-shaped base plate connected with the first oil cylinder, and each second loading group comprises a second oil cylinder and a second arc-shaped base plate connected with the second oil cylinder; the second loading group comprises a second oil cylinder and a second arc-shaped base plate connected with the second oil cylinder; the first oil cylinder and the second oil cylinder are fixed through mounting seats, and piston rods of the first oil cylinder and the second oil cylinder extend in the radial direction of the lining; the outer surfaces of the arc-shaped base plates are cambered surfaces matched with the inner wall of a lining, wedge-shaped ends are machined at the two ends of the first arc-shaped base plate, and matched wedge surfaces are machined on the inner peripheries of the two ends of the second arc-shaped base plate. The hydraulic control system is connected with the first oil cylinder and the second oil cylinder and controls the stretching and retracting time sequence of the first oil cylinder and the second oil cylinder, no mechanical interference exists between the first arc-shaped base plate and the second arc-shaped base plate in the stretching and retracting process, and the outer arc surfaces of all the arc-shaped base plates are continuously attached to the inner wall of the lining.

The invention belongs to the technical field of perovskite nanocrystalline materials, and particularly relates to a plano-convex lens type CsPb2Br5-CsPbBr3 composite micron disc and a preparation method thereof. In order to develop the growth-controllable CsPb2Br5-CsPbBr3 composite material, a chemical vapor deposition method is utilized, CsBr and PbBr2 are uniformly mixed and placed in the center of a tubular furnace, a silicon substrate is placed in the downstream of the tubular furnace, inert gas is introduced, and after a high-temperature growth reaction, the growth-controllable CsPb2Br5-CsPbBr3 composite material is prepared. And the CsPb2Br5-CsPbBr3 composite micron disc with a smooth surface and a plano-convex lens type appearance is obtained on the silicon substrate by controlling a proper cooling temperature. According to the method for preparing the CsPb2Br5-CsPbBr3 composite material, the needed raw materials are easy to obtain, the preparation process is simple, the method is suitable for large-scale production, and the prepared plano-convex lens type CsPb2Br5-CsPbBr3 composite micron disc is excellent and controllable in optical performance.

The invention relates to the technical field of traditional Chinese medicine crushing devices, and discloses a superfine crushing device and a raw material crusher for separating and purifying traditional Chinese medicine preparations. The device is characterized in that a temperature detection element is arranged on a superfine grinding mechanism so as to measure the temperature of airflow in the superfine grinding mechanism and / or the temperature of the inner wall of the superfine grinding mechanism and output a temperature signal; the control element is electrically connected with the temperature detection element, the cooling unit and the external air source, receives the temperature signal and adjusts the power of the cooling unit and the external air source based on the temperature signal; and the bottom of the superfine grinding mechanism is connected with a cooling unit used for reducing the temperature, the problem that in the discharging process of an existing superfine grinding machine, discharging blockage is caused is solved, air flow generated by a nozzle is used for driving escape powder to move at a high speed, collision occurs, and the powder is prevented from falling off. And the design of a net-free annular through opening is used for replacing the filtering of multilayer filter screen superposition, so that the discharging blockage can be avoided, and meanwhile, the filtering effect is improved.

The invention relates to marking of micro-plastics, in particular to a method for marking fiber micro-plastics by using up-conversion nanoparticles (UCNPs) and application. The method specifically comprises the following steps: dispersing rare earth doped UCNPs and polyacrylonitrile (PAN) powder in a dispersion liquid to obtain a spinning solution, and marking the fiber micro-plastic with the up-conversion nanoparticles through an electrostatic spinning-high-speed roller system. The prepared labeled fiber micro-plastic has excellent up-conversion luminescence performance, interference of autofluorescence of biological tissue can be effectively reduced, and detection of distribution of the labeled fiber micro-plastic in a living body is achieved in combination with a time-gated imaging technology; the rare earth elements in the up-conversion nanoparticles can be used as element tags, and high-sensitivity quantitative analysis is carried out by using a plasma mass spectrometer; the up-conversion nano-particles are firmly embedded in the fiber micro-plastic through an electrostatic spinning technology, the stability of the marker is ensured, and the diameter of the fiber micro-plastic can be accurately regulated and controlled by adjusting the concentration of a spinning solution and the spinning voltage.

This invention discloses a radiation shielding device for an X-ray generator, comprising a generator body, an emission front end at one end of the generator body, a shielding rear sleeve fixed to the emission front end, a positioning seat fixed to one side of the generator body, a rotating sleeve connected to one side of the positioning seat, and a plurality of positioning sleeves arranged around the outer periphery of the rotating sleeve. In this invention, a rotating sleeve and a plurality of positioning sleeves are arranged around the outer periphery of the rotating sleeve. A shielding middle sleeve that slides axially is fitted onto the positioning sleeve. A shielding front cover is fitted onto the front part of the shielding middle sleeve, and a target hole is opened at the front end of the shielding front cover. The target holes on each shielding front cover surrounding the rotating sleeve have different diameters. When the rotating sleeve is rotated, the surrounding shielding front covers can dock with the shielding rear sleeve on the generator body through the shielding middle sleeve. This arrangement makes the diameter of the X-ray beam formed by the emission front end adjustable and easy to adjust, suitable for different detection area requirements.

The invention relates to the technical field of wire drawing machines, in particular to a wire drawing machine for high-quality metal wire production, which comprises a frame body and a wire drawing mechanism. The wire drawing mechanism comprises a die sleeve, a front end cover, a rear end cover and a wire drawing die. The die sleeve is installed on the frame body, and the front end cover, the wire drawing die and the rear end cover are all arranged on the die sleeve. The wire drawing die is of a conical structure and comprises a plurality of first split dies and a plurality of second split dies, a wire drawing channel is defined by the first split dies and the second split dies, a first guide groove is formed in the die sleeve, and the second split dies are in sliding fit with the first guide groove. According to the wire drawing machine for high-quality metal wire production, the multiple first split dies and the multiple second split dies move in the first guide grooves, the diameter of a wire drawing channel is adjustable, and the operation difficulty and the labor intensity when a metal wire penetrates through the wire drawing die are reduced.