127results about How to "Good magnification" patented technology

Visualization stylets and methods of use are provided, in which the visualization stylets include modular components that allow interchangeability of imaging devices and lenses, and the use of forward-facing or lateral-facing lens orientations. Optionally, the lens may be focused remotely. A reduced insertion profile is provided by configuring the circuitry of the imaging device so that it is disposed substantially perpendicular to a plane of a pixel array of the imaging device.

An x-ray microscope uses a microfocus x-ray source with a focus spot of less than 10 micrometers and a Wolter condenser having a magnification of about four or more for concentrating x-rays from the source onto a sample. A detector is provided for detecting the x-rays after interaction with the sample, and an x-ray objective is used to form an image of the sample on the detector. The use of the Wolter optic addresses a problem with microfocus sources that arise when the size of the focal spot that must then be imaged onto the sample with the condenser is smaller than the field of view.

An inverted real image forming opthalmoscopic contact lens provides for viewing and treating structures within an eye. The lens comprises a contacting surface adapted for placement on the cornea of the eye, a concave annular anterior reflecting surface, a convex annular posterior reflecting surface, and two non-reflective portions. A first non-reflective portion is positioned along the lens axis and proximate to the convex annular posterior reflecting surface. A second non-reflective portion is positioned along the lens axis and proximate to the concave annular anterior reflecting surface. A light beam emanating from the structure of the eye enters the lens and contributes to the formation of an inverted real image of the structure through an ordered sequence of reflections of the light beam, first in a posterior direction from the anterior concave reflecting surface and next as a negative reflection in an anterior direction from the convex posterior reflecting surface.

The invention discloses a preparation method of a graphene / lithium titanate composite anode material, which comprises the following steps: compounding compounds serving as a lithium source and a titanium source and graphene oxide through a liquid-phase method and reducing graphene oxide of the compound in inert gas mixed with reducing gas into graphene so as to obtain the graphene / lithium titanate composite anode material. The method has the characteristic of realizing uniform distribution of graphene in lithium titanate through an in-situ compounding technique. Under the same conditions, the discharge time of a hybrid capacitor which respectively takes the graphene / lithium titanate composite anode material and activated carbon as the anode and cathode is obviously greater than that of an electric double-layer capacitor which takes activated carbon as an electrode and that of a hybrid capacitor which respectively takes lithium titanate and activated carbon as the anode and cathode. The lithium titanate phase purity of a hybrid supercapacitor and lithium ion battery composite anode materials prepared by the method disclosed by the invention is higher. Furthermore, the preparation method further has the characteristic of easily realizing the large-scale industrial production.

The present invention provides an optical pickup device which realizes an optical system having an optical magnification suitable for each disc format between three optical discs and a light emitting means for emitting a laser beam having a wavelength corresponding to each disc in the optical system of the optical pickup for recording and / or reproducing an information signal to the optical discs and which prevents the number of components from being increased to simplify the composition of the optical system, thereby preventing the length of an optical path from being lengthened, the optical pickup from being increased in size. The optical pickup device has a first light emitting unit for emitting a laser beam having a first wavelength and a laser beam having a second wavelength, a second light emitting unit for emitting a laser beam having a third wavelength, a first collimator lens for transmitting the laser beam having the first wavelength and the laser beam having the second wavelength, a second collimator lens for transmitting the laser beam having the third wavelength, a first objective lens for transmitting the laser beam having the first wavelength transmitted through the first collimating lens or the laser beam having the third wavelength transmitted through the second collimator lens, and a second objective lens for transmitting the laser beam having the second wavelength transmitted through the first collimator lens.

The invention discloses a preparation method of a spherical high-capacity lithium-rich positive electrode material. A sintering process is improved through regulating a coprecipitation reaction mode. The preparation method comprises the following steps: 1, preparing a nickel-cobalt-manganese sulfate solution; 2, performing a coprecipitation reaction on the nickel-cobalt-manganese sulfate solution and a mixed solution of a carbon carbonate solution and ammonia water at a pH value of 7-9 to obtain a solid-liquid mixture of a precursor; 3, filtering, separating, washing and drying to obtain a carbonate precursor; 4, performing gradient temperature rise on the carbonate precursor in a tubular furnace and keeping the temperature, cooling, crushing and sieving to obtain a nickel-cobalt-manganese oxide; and 5, mixing the nickel-cobalt-manganese oxide with lithium carbonate powder, and performing multi-section ventilation roasting in the tubular furnace to obtain the target object. The preparation method has the advantages that the sintering process is improved through regulating the coprecipitation reaction mode, the granularity of the precursor is effectively controlled, and the high-capacity lithium-rich lithium ion positive electrode material with a layered crystal structure, which is high in energy density, good in rate capability, low in cost, good in safety and long in service life, is prepared, and the market demand is met.

A dual magnification reversible spot mirror device includes two mirrors having different magnifications, e.g., 5X and 10X, mounted back-to-back in a cylindrical frame ring which has an outer cylindrical wall surface from which protrudes a circumferential annular ring-shaped rib, and a mirror frame holder which has protruding forwardly from a base thereof a plurality of circumferentially spaced apart, longitudinally disposed flange walls which are elastically deformable in a radially outwardly direction from a longitudinal center line perpendicular to the base. Retainer lips protruding radially inwardly from inner longitudinal wall surfaces of the flange walls are forced radially outwardly in response to rearward forcible contact with the lips by the frame rib, whereupon the flange walls deflect elastically inwardly to an undeformed position in which the mirror frame ring with a reversible selected mirror facing outwards is captivated between a front wall surface of the base and rear surfaces of the flange wall lips. The base of the mirror frame holder is pivotably mounted to a mounting base which has suction cups protruding rearwardly therefrom for releasable attachment to a flat surface such as the vertical surface of a larger wall or cabinet mirror, or the horizontal surface of a table top or vanity.

The invention discloses a high-capacity lithium ion battery negative electrode plate and a preparation method thereof. The negative electrode plate comprises a negative electrode current collector, and a base coat, an active substance layer and a conductive composite layer which are coated on the surface of the negative electrode current collector. The negative electrode plate is characterized in that the base coat makes a silicon material and a carbon material deposit on the surface of the current collector to form unit cells in the staggered directions through a vapor deposition method, and the silicon material and the carbon material are arranged in the unit cells in a staggered mode. The silicon material and the carbon material deposit on the surface of the current collector through the vapor deposition method and are high in density and large in adhesive force with the current collector, and the process is controllable; meanwhile, the carbon material deposits on the periphery of the silicon material, the electric conductivity of the electrode plate is improved, the expansion rate of the electrode plate is decreased, and therefore the energy density and cycle performance of a lithium ion battery are improved.

A magnifier for use by people with low vision includes a large LCD display upon which an enlarged image appears. Light from an LED is directed in a first direction onto a deflection wall where it is deflected into a direction substantially orthogonal to the first direction. The deflected light impinges upon a diffuser that bends it so that it illuminates an object upon which the magnifier is placed. The light is then reflected by the object, through the diffuser, and onto a mirror positioned at an angle relative to the object. The mirror directs the light onto a camera lens and the lens focuses the light onto a sensor that drives the LCD display so that the image appears on the LCD screen. The camera is slideably mounted so the user can make the image larger or smaller by sliding the camera toward or away from the mirror, respectively.

The invention discloses a high-nickel cobalt-free quaternary positive electrode material and a preparation method thereof. The chemical formula of the positive electrode material is LiNixMnyMzN(1-x-y-z)O2, wherein x is greater than or equal to 0.8 and less than 1, y is greater than 0 and less than 0.2, z is greater than 0 and less than 0.2, and M and N are combinations of any two of Al, Mg, Zr, Ti, Cr, W, V, Ce, Fe, Cu, Zn and Nb. The method has the main advantages that an expensive cobalt element is not used, an ammonia water complexing agent is not used in the precursor preparation process,the alkali content of the surface of the high-nickel cobalt-free quaternary positive electrode material obtained through primary sintering is low, and the washing and secondary sintering processes ofthe material are not involved, so the preparation cost is greatly reduced; and besides, the high-nickel cobalt-free quaternary positive electrode material has excellent rate capability, the specific capacity at 1 C rate reaches 200 mAh / g or above, the cycling stability is excellent, and the capacity retention ratio exceeds 95% after 500 cycles.

The invention discloses a preparation method of high-efficiency lithium-ion battery slurry. The preparation method comprises 1: adding a powdery active material, a conductive agent and a binder into amixer and carrying out uniform stirring, 2: adding 10 to 40wt% of a solvent into the powdery material obtained in the step 1 and carrying out stirring, 3: adding 30-60 wt% of a solvent into the materials in the step 2 and carrying out stirring, and 4, adding the rest of the solvent into the materials in the step 3, carrying out stirring, carrying out filtration through a screen and discharging the materials. The preparation method reduces processes, is simple and easy, shortens stirring time and improves production efficiency. The prepared slurry is uniform and stable, is not easy to layer and improves lithium-ion battery rate and cycle performances.

The invention discloses a preparation method of modified spinel lithium manganese oxide, an cathode material for a lithium ion cell. The preparation method comprises the following steps of metering one or more than two manganese compounds selected from MnO2, Mn3O4, Mn(OH)2 and Mn2O3, a lithium compound selected from Li2CO3 and LiOH and one or more doping agents selected from oxides or hydroxides of Cr, La, Ce, Zr, Ni, Mg, Ti, Al, Ca, V and B according to a chemical formula Li(1+X)Mn(2-X-Y)MYO4 (M is a doping modifier, X is not less than 0 and not more than 0.20 and Y is not less than 0 and not more than 0.25), mixing the materials uniformly, then carrying out sintering and surface treatment, reducing the alkali content of the sintered substance through surface treatment, controlling the alkali content in a certain range and then carrying out smashing, dispersing and grading and sieving, thus obtaining the uniformly doped lithium manganese oxide cathode material. The method is simple, the preparation processes are easy to operate and control, the production cost is low and the product performances are excellent.

The invention relates to an in-situ nitrogen-doped porous core-shell-structured carbon / selenium composite material. According to the invention, a core-shell-structured porous carbon nano-material withnitrogen-containing ZIF-8 selected from metal-organic frameworks as a core and ZIF-67 selected from metal-organic frameworks as a shell is used as a precursor, and the prepared porous carbon nano-material has a core shell structure; a metal-organic framework material having a three-dimensional interlocking-pore structure and containing nitrogen is used as a precursor; and the prepared porous carbon / selenium composite positive-electrode material is large in the pore size of the core and small in the pore size of the shell. The prepared composite material is uniform in pore size distribution and small in the size of carbon nanoparticles, can be thoroughly infiltrated by an electrolyte and shortens an electron transport path; and micropores and mesopores in the composite material improve theload capacity of selenium and have good restriction effect on the shuttle effect of selenium, so the composite positive-electrode material is effectively improved in cycle stability and capacity retention ratio.

A magnifier for use by people with low vision includes a large LCD display upon which an enlarged image appears. Light from an LED is directed in a first direction onto a deflection wall where it is deflected into a direction substantially orthogonal to the first direction. The deflected light impinges upon a diffuser that bends it so that it illuminates an object upon which the magnifier is placed. The light is then reflected by the object, through the diffuser, and onto a mirror positioned at an angle relative to the object. The mirror directs the light onto a camera lens and the lens focuses the light onto a sensor that drives the LCD display so that the image appears on the LCD screen. The camera is slideably mounted so the user can make the image larger or smaller by sliding the camera toward or away from the mirror, respectively.

The invention discloses a new use of a rubidium cesium compound in the field of lithium ion batteries as an additive in a high-voltage electrolyte, a high-voltage electrolyte additive, the high-voltage electrolyte and a lithium ion battery. The high-voltage electrolyte consists of an electrolyte lithium salt, an organic solvent and 0.05%-5% of rubidium cesium compound. The rubidium cesium compound as the high-voltage electrolyte additive for the lithium ion battery can protect an anode material, effectively reduces oxidative decomposition of the electrolyte on the anode surface, greatly upgrades the cycling stability of a battery, increases the battery life, and promotes truly commercial application of the high-voltage anode material. The high-voltage electrolyte using the rubidium cesium compound or the high-voltage electrolyte additive can effectively improve the discharge capacity of the high-voltage anode material under high current density, prolongs the cycling life of the high-voltage anode material battery, and simultaneously upgrades the power characteristic of the battery under high current density.

The invention discloses a core-shell structured lithium ion battery positive composite material and its preparation method. The composite material includes a LiFePO4 nanometer core and a Li3V2(PO4)3 shell, the Li3V2(PO4)3 shell is uniformly coated on the periphery of the LiFePO4 nanometer core, and the periphery of the Li3V2(PO4)3 shell is coated with amorphous carbon. The positive composite material has the advantages of high specific capacity, high energy density, good cycle stability, good rate performance and the like. The preparation method comprises the following steps: stirring an iron source compound, a vanadium source compound, a phosphorus source compound, a lithium source compound, a chelating agent and a carbon source in deionized water, and sintering the obtained mixture to obtain the composite material. The preparation method has the advantages of simple process, easy operation, low cost, environmental protection, and suitableness for large-scale and industrialized production.

The invention provides porous lithium iron phosphate / carbon composite microspheres and a preparation method thereof. The porous lithium iron phosphate / carbon composite microspheres and the preparation method thereof are characterized in that iron phosphate oxalate is used as a precursor and the preparation method comprises the following steps: (1) dispersing solution of iron salt and phosphate solution into a precipitating agent ethanol, adding lithium salt, carrying out ultrasonic stirring to enable the solution of iron salt, the phosphate solution and the lithium salt to be totally dissolved, and adding a certain quantity of oxalic ethanol solution into the obtained solution; (2) placing the obtained mixture into an oven to dry at a certain temperature so as to obtain a yellow jelly iron phosphate oxalate precursor; and (3) after mixing a carbon source and the iron phosphate oxalate precursor, calcining to obtain the porous lithium iron phosphate / carbon composite microspheres. The preparation method provided by the invention is low in cost and is simple and easy to operate; the pH does not need to be regulated; the products have high purity, high tap density and good repeatability; the products are spherical particles formed by self-assembling disk nano-scale particles, and thus, the specific surface area is large; and moreover, the diffusion path of lithium ions is greatly shortened, so that the porous lithium iron phosphate / carbon composite microspheres have excellent electrochemical property and are suitable for large-scale production.

Disclosed is a preparation method of a nitrogen-doped carbon composite transition metal carbodiimide material. The method comprises the steps of: grinding an inorganic transition metal salt and a carbon and nitrogen containing organic compound to obtain a mixture, the mass ratio of the inorganic transition metal salt to the carbon and nitrogen containing organic compound in the mixture being 4:1-1:7; holding the mixture in an argon atmosphere at 140-200 DEG C for 10-50 min, and then holding at 300-700 DEG C for 30 min to 4h to obtain the nitrogen-doped carbon composite transition metal carbodiimide material. By compounding the prepared transition metal material structure with a nitrogen-doped carbon material, the conductivity and structural stability of the material during charge and discharge can be significantly improved. The nitrogen-doped carbon composite transition metal carbodiimide material prepared by the method has extremely high sodium ion storage performance, high charge anddischarge capacity and excellent rate performance.

The invention provides a high-performance core-shell structure positive electrode material and a preparation method thereof. The preparation method comprises the following specific steps: (1) preparing a mixed solution A and a mixed solution B of nickel, cobalt and manganese salts with different molar components, and independently preparing a salt solution containing an X element; (2) respectively and simultaneously adding the solution A, an alkali solution and a complexing agent solution into a reaction kettle, and carrying out coprecipitation reaction to obtain an inner core; (3) adding the X salt solution and a precipitator solution to obtain an inner core with a coating layer; (4) adding the solution B, the alkali solution and the complexing agent solution into the base solution of the inner core with the coating layer to obtain a core-shell precursor with an interlayer; and (5) roasting to obtain the core-shell positive electrode material. According to the core-shell positive electrode material disclosed by the invention, due to the existence of the interlayer, a gap generated due to different volume changes of the inner core and the outer shell can be overcome, so that the connection force between the outer shell and the inner core is enhanced, and compared with a common core-shell positive electrode material, the core-shell positive electrode material has relatively excellent thermal stability and relatively long cycle performance.

The invention provides a preparation method of a carbon nanotube lithium titanate composite cathode material. The preparation method includes: ultrasonically dispersing carbon nanotube powder into a solvent to obtain a carbon nanotube solution A; under a stirring or ultrasonic condition, adding a lithium source compound, a titanium source compound and a catalyst into the solution A, and regulating pH to obtain a solution B; using a liquid-phase method to process the solution B, and drying obtained solid to obtain carbon nanotube lithium titanate composite precursor powder; calcining the precursor powder in inert gas, and cooling to obtain the carbon nanotube lithium titanate composite cathode material. The preparation method has the advantages that the prepared carbon nanotube lithium titanate composite cathode material is high in electron conductivity and ion conductivity, high in phase purity and good in circulation stability, and large-scale production can be achieved easily.

The invention discloses a preparation method of a composite anode material of a lithium-ion power battery. The composite anode material comprises LiNi1 / 3Co1 / 3Mn1 / 3O2 and carbon nano tubes (CNTs). According to the preparation method, citric acid is used as a chelating agent, ethylene glycol is used as a cross-linking agent, and the composite anode material LiNi1 / 3Co1 / 3Mn1 / 3O2 / CNTs of a lithium-ion battery is prepared through a Pechini method and a high-energy ball milling method. Compared with the traditional precipitation type preparation method, the preparation method provided by the invention is simpler, and the synthesized composite anode material LiNi1 / 3Co1 / 3Mn1 / 3O2 / CNTs have the characteristics of high specific capacity, high cycle performance, excellent rate capability and the like.

The invention discloses a flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and a preparation method and application of such material. The flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material prepared by a melt diffusion method can be sufficiently infiltrated by electrolyte and shorten an electron transmission route, and microporous and mesoporous structures can increase selenium load capacity and well restrict the selenium shuttle effect; macropores are beneficial to sufficient contact between the electrolyte and active substances and effectively enhance cycling stability and a capacity retention ratio of a composite electrode prepared from the material. The flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material has the advantages of high specific capacity, good cycle performance and excellent rate capability, and the preparation method is simple, thereby being of great popularization and application significance.

The invention relates to a carbon-based compounded ferric cyanamide material and a preparation method thereof. The carbon-based compounded ferric cyanamide material comprises ferric cyanamide and carbon compounded with the ferric cyanamide. According to the material, the ferric cyanamide is compounded with the carbon, so that the problem that the volume of ferric cyanamide is increased can be effectively solved, meanwhile due to compounding of the two materials, the reaction activity of a battery can be further improved, the battery can be relatively stable in structure, and the multiplying power and the circulation performance of the battery can be improved.

A carbon-coated molybdenum sulfide / water hyacinth biomass carbon composite material and a preparation method and use thereof comprise the following steps of: Including: the first step, using sodium molybdate and thioacetamide as raw materials, through a 160-200 DEGC hydrothermal method, growing a MoS2 nanosheet array on the surface of the bulbous water hyacinth biomass carbon; the second step, 80-100 DEG C water bath method is coated on the MoS2 nanosheet array with a layer of dopamine polymer; the third step is to carbonize the polymerized dopamine to form a carbon coating layer by calcination at 500 to 800 DEG C in an inert atmosphere to obtain carbon coated molybdenum sulfide. / Water hyacinth biomass carbon core shell composite. The invention has simple operation, large output and uniform coating layer . The invention has the advantages of simple operation, large output and uniform coating layer. The composite material has the advantages of low cost, high reversible charge-dischargecapacity, long cycle life and excellent rate performance when it is used as a sodium ion negative electrode material.

The invention belongs to the field of electrode materials, and discloses a high-loadng self-supporting thick electrode prepared through phase inversion and a preparation method and application thereof. The electrode prepared by the process has the following advantages: 1) a current collector, a binder and additional conductive carbon are not needed, so that the overall energy density of the electrode is greatly improved; 2) the thickness of the electrode is 300-3000 [mu]m, the loading capacity is 8-55 mg cm <-2 >, the thick electrode can improve the proportion of active materials in the wholeenergy storage equipment, and the energy density of the whole energy storage equipment is improved; 3) compared with a thin electrode, under the condition of achieving the same energy storage capacity, the high-loading thick electrode has fewer preparation steps and is lower in production cost; and 4) the electrode is provided with micron-sized finger-shaped holes communicated with the surfaces ofthe two electrodes and hundred-nanometer-sized holes dispersed in the whole electrode, and the holes ensure that the electrode has excellent rate capability even under a high loading capacity. The method promotes the industrial application and mass production of the high-loading self-supporting thick electrode.

The invention relates to the fields of energy storage technology and power battery material technology, and specifically relates to a lithium iron phosphate-modified conductive carbon black composite electrode material preparation method. The preparation method comprises (1) a step of subjecting common conductive carbon black to annealing treatment, and then performing oxidation treatment in a strong oxidant to prepare the modified conductive carbon black; and (2) a step of preparing the lithium iron phosphate-modified conductive carbon black composite electrode material. According to the invention, by addition of modified SP which is easily dispersed, the composite electrode material prepared by the invention has small specific surface, thus facilitating battery preparation.

The present invention relates to silica particles for an electrode material, and the silica particles are characterized in that the silica particles comprise silicon monoxide particles having a general formula SiOx; and a carbon layer, wherein the silicon monoxide particles are bonded by the carbon layer, and the silicon monoxide particles bonded by the carbon layer are coated by the carbon layer.The silica particles are compact, narrow in particle size distribution and small in specific surface area, and have the advantages of high capacity, high coulombic efficiency, low expansion, high cycle retention rate and the like.

The invention provides a preparation method of a sodium ion battery negative electrode material, the negative electrode material and a sodium ion battery. The preparation method of the sodium-ion battery negative electrode material comprises the following steps: (1) hydrothermal reaction: uniformly stirring phenylenediamine, tannic acid and graphene oxide in water, transferring into a reaction kettle, and carrying out hydrothermal reaction to obtain a compound; (2) carbonization reaction: carbonizing the compound in a carbonization furnace at 400-700 DEG C. In the preparation method disclosed by the invention, phenylenediamine and tannic acid can form a hard carbon material on the basis of graphene after being carbonized, more ion diffusion channels are provided, and the high-rate charge-discharge performance is improved. The phenylenediamine and the tannic acid can be used for carrying out heteroelement doping on the formed graphene composite material, so that part of active sites of the material are increased, and the overall material capacity is improved. Moreover, the carbonized graphene composite material doped with N and O also has relatively high conductivity, and when the graphene composite material is prepared into a negative plate, the addition of a conductive agent can be reduced, so the manufacturing cost of the battery is reduced.

The invention provides a counting method and a counting system for milk body cells based on mobile equipment. The method comprises the following steps: sample processing: marking the milk body cells for a to-be-tested milk sample; induced fluorescent amplification treatment: carrying out fluorescence enhancement on the marked milk body cells; and acquiring cell images by using mobile equipment and processing by virtue of a counting algorithm to identify the milk body cells and carry out statistics on quantity, and displaying, transmitting or printing, wherein the mobile equipment acquires images by virtue of photographing and counts the milk body cells of the images. The processing method sequentially comprises the following steps: carrying out RGB to gray processing on the images; converting the grayscale image to a binary image; carrying out breadth first search and counting; and displaying a counting result. The method and the system provided by the invention have the characteristics of small size, portability, high analysis efficiency and good precision, can be used for field detection of a milk plant and the like.