41results about How to "Adjustable distribution" patented technology

The invention provides a photographing optical lens assembly, an imaging apparatus and an electronic device. The photographing optical lens assembly includes eight lens elements, which are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. Each of the eight lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has positive refractive power. The object-side surface of the fifth lens element is concave in a paraxial region thereof. The image-side surface of the sixth lens element is concave in a paraxial region thereof. The object-side surface of the seventh lens element is convex in a paraxial region thereof. The image-side surface of the eighth lens element is concave in a paraxial region thereof. When a specific condition is satisfied, the total length of the optical lens group for photographing can be shortened and a configuration of a large imaging surface can be provided.

The invention relates to magnetic polyurethane elastomer composites, in particular to a preparation method of high-performance magnetic polyurethane elastomer composites, and aims to solve the problem that the mechanical and magnetic properties of magnetic elastomer composites are difficult to be optimized simultaneously, wherein the solution is that the preparation method comprises the following steps: preparing Fe3O4 water-based magnetic fluid by a chemical coprecipitation method, and preparing graphene @ Fe3O4 composite magnetic particles by adsorption; purifying and dispersing the graphene @ Fe3O4 composite magnetic particles in an organic solvent to obtain graphene @ Fe3O4 composite organic magnetic fluid; taking graphene @ Fe3O4 composite organic magnetic fluid as one of the main raw materials to prepare graphene @ Fe3O4 polyurethane elastomer composites by a magnetic controlled in-situ polymerization method. The preparation method of high-performance magnetic polyurethane elastomer composites has the advantages that the problem of easy aggregation of functional fillers in the preparation and forming process of composites is solved, the dispersion and distribution of functional particles in polymer matrix are improved and controlled, graphene is introduced to improve the mechanical and magnetic properties of magnetic elastomer composites simultaneously, and the magnetic elastomer composites have excellent mechanical and magnetic properties.

An image capturing lens assembly, an imaging apparatus and an electronic device are provided. The image capturing lens assembly includes seven lens elements, which are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has negative refractive power. The third lens element has positive refractive power. The seventh lens element has negative refractive power. When a specific condition is satisfied, a wide viewing angle configuration can be formed, the volume of the image capturing lens group can be compressed, and aberration can be reduced.

The invention discloses an image capturing optical system, an image capturing device and an electronic device. The image capturing optical system includes ten lenses. The ten lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens from the object side to the image side along an optical path. Each of the ten lenses has an object-side surface facing the object-side direction and an image-side surface facing the image-side direction. The first lens element has positive refractive power. The second lens element has an image-side surface being concave in a paraxial region thereof. The tenth lens element has negative refractive power. At least one of an object-side surface and an image-side surface of at least one lens in the image capturing optical system has at least one critical point at an off-axis position. When specific conditions are met, the image capturing optical system can meet the requirements of wide viewing angle, miniaturization and high imaging quality at the same time. The image capturing device is provided with the image capturing optical system, and the electronic device is provided with the image capturing device.

The invention discloses a method for synthesizing bisphenol F from phenol and formaldehyde with a phosphotungstic acid modified metal organic frame catalyst. In the method, through selection of different metal source and modification amount of phosphotungstic acid, the phosphotungstic acid modified metal organic frame catalyst is prepared in a one-step manner. The catalyst is simple in preparation method, is convenient to separate and recycle and can be reused and is free of corrosion to devices. When being used for catalyzing the phenol and the formaldehyde to synthesizing the bisphenol F, the catalyst can regulating distributions of three isomers of a product of the bisphenol F. The invention provides a new method for catalytically synthesizing the bisphenol F.

The invention belongs to the scope of preparation of geopolymer foaming materials, and specifically discloses a preparation method of geopolymer open-cell foaming materials, which is characterized in that the geopolymer raw materials, alkali activators, hydrogen peroxide, twelve The raw material slurry of sodium alkylbenzene sulfonate is foamed to obtain the product; sodium dodecylbenzene sulfonate is 0.2-1% of the weight of the geopolymer; H2O2 is 0.01-5% of the weight of the geopolymer raw material. The present invention innovatively uses sodium dodecylbenzene sulfonate to control the pore structure, and further through the synergistic control of the dosage of sodium dodecylbenzenesulfonate, foaming agent and its dosage, etc., can unexpectedly prepare the A geopolymer open-cell foaming material with a large specific surface area, uniform distribution of pores, and a relatively large pore diameter of the interconnecting pores was developed.

The invention relates to a catalyst for synthesis of low carbon alcohol by hydrogenation of carbon dioxide as well as a preparation method and an application thereof, and more specifically relates to a ternary metal sulfide catalyst with a layered structure as well as a preparation method and an application thereof. The catalyst employs basic nickel carbonate which is prepared by coprecipitation of nickel salt and base as a template, an ion exchange method is used for introducing transition metal molybdenum, alkali metal potassium is dipped, and sulfuration is carried out in order to obtain the catalyst. Hydrogenation for carbon dioxide is carried out on the catalyst in order to directly obtain ethanol, propanol and other alcohol fuel with high added values, and proportioning of each metal in the catalyst can be changed in order to adjust distribution of alcohol products. In an optimum condition, the mol fraction of ethanol in total alcohol reaches 43% and far exceeds the mol fraction of ethanol in total alcohol which is synthesized on a rhodium-based catalyst. Compared with a traditional coprecipitation immersion method, raw material loss due to different pH conditions of nickel and molybdenum precipitation is avoided, and utilization rate of raw material is substantially improved.

The invention relates to a heat insulation material containing a gradient distribution anti-radiation agent and its preparation method and application, including: using a silicon-aluminum composite sol and a silane coupling agent to adjust the surface group reactivity and surface polarity of the fiber reinforcement respectively ; Preparation of dispersions containing silica sol precursors, surfactants, catalysts and different concentrations of anti-radiation agents; while adding dispersions with high concentrations of anti-radiation agents to dispersions with low concentrations to form mixed dispersions, perform glue injection , then gelled, aged, and dried. The invention also relates to the heat insulating material prepared by the method and its application. The heat insulation material has a structure of uniform and discrete distribution of anti-radiation particles in the plane and a discrete distribution of normal gradients, which maximizes the anti-radiation efficiency brought by the same mass anti-radiation agent while ensuring excellent integrity, eliminating The adsorption and filtration of anti-radiation agent particles by fibers realizes the arbitrary matching of reinforcement fibers and anti-radiation agents and solves the problem of agglomeration.