42 results about "Filling fraction" patented technology

A device and method for improving the performance of a pulse detonation engine. The device includes at least one of an exhaust structure and an ejector. The exhaust structure can be configured as a straight, converging or diverging nozzle device, and connected to the engine to control the flow of a primary fluid produced during a detonation reaction. The ejector is fluidly coupled to the engine, using the movement of the primary fluid to promote entrainment of a secondary fluid that can be mixed with the primary fluid. The secondary fluid can be used to increase the mass flow of the primary fluid to increase thrust, as well as be used to cool engine components. Device positioning, sizing, shaping and integration with other engine operating parameters, such as fill fraction, choice of fuel and equivalence ratio, can be used to improve engine performance. In addition to thrust augmentation and enhanced cooling, the disclosed device can be used for engine noise reduction.

Various embodiments of optical fiber designs and fabrication processes for ultra small core fibers (USCF) are disclosed. In some embodiments, the USCF includes a core that is at least partially surrounded by a region comprising first features. The USCF further includes a second region at least partially surrounding the first region. The second region includes second features. In an embodiment, the first features are smaller than the second features, and the second features have a filling fraction greater than about 90 percent. The first features and/or the second features may include air holes. Embodiments of the USCF may provide dispersion tailoring. Embodiments of the USCF may be used with nonlinear optical devices configured to provide, for example, a frequency comb or a supercontinuum.

The invention discloses an axial injection end combustion solid-liquid rocket engine structure which comprises an engine head cover, a solid propellant shell, a solid propellant heat insulating layer, end combustion solid propellants, a spray pipe shell and a spray pipe heat insulating layer. The engine head cover is mounted at the front end of the solid propellant shell, the spray pipe shell is mounted at the rear end of the solid propellant shell, the engine head cover is provided with an air inlet channel, the end combustion solid propellants are coaxially arranged in the solid propellant shell, a constant volume cavity is formed between the front end faces of the end combustion solid propellants and the rear end face of the engine head cover, each end combustion solid propellant is provided with a plurality of axial injection holes with small diameters, the flow rate of oxidizing agents in the injection holes is high, and combustion reaction only occurs at the end faces of the end combustion solid propellants; the joint between the solid propellant shell and the engine head cover and the joint between the solid propellant shell and the spray pipe shell are respectively provided with a sealing structure, so that air impermeability of an engine is guaranteed; the heat insulating layers are arranged in the solid propellant shell and the spray pipe shell, so that thermal protection performance of the engine during operation is guaranteed. Thus, performance of the engine is improved, meanwhile the filling fraction of the engine is improved, the slenderness ratio of the engine is reduced, and the application rage of engine is widened.

Provided is a holey single-mode optical fiber including a core not having holes, and a clad having holes extending in a longitudinal direction, in which a refraction index of the core is larger than that of a portion of the clad other than the holes, a radius r₁ of the core is within a range of 2.2 to 3.2 μm, a relative refraction index difference Δ of the core to the clad is within a range of 0.3 to 0.56%, a distance R_in between a center of the core and an inner edge of the holes is 2.0 to 3.5 times the radius r₁ of the core, an air-filling fraction F is within a range of 30 to 50%, a cable cut-off wavelength is 1.0 μm or less, a zero-dispersion wavelength is within a range of 1260 to 1460 nm, and a bending loss characteristic at a bending radius of 10 mm is 10 dB/m or less.

A cover glass of the present invention for photoelectric conversion devices includes a glass sheet having surface asperities and a reflection-reducing film formed over the surface asperities of the glass sheet. The surface asperities of the glass sheet have an average spacing Sm of 0.3 mm or more and 2.5 mm or less and an arithmetic average roughness Ra of 0.3 μm to 5 μm. The reflection-reducing film includes fine silica particles having an average particle diameter of 50 to 200 nm and a binder for the fine silica particles, and the fine silica particles are uniformly arranged in a single layer on peak portions of the surface asperities in such a manner that a filling fraction F is 35 to 65%. A transmittance gain is 2.37% or more, the transmittance gain being obtained by subtracting an average transmittance of the glass sheet as measured when light having wavelengths ranging from 380 to 1100 nm are incident on a face of the glass sheet that has the surface asperities, from an average transmittance of the cover glass as measured when light having the wavelengths are incident on a reflection-reducing film side of the cover glass. Thus, a cover glass for photoelectric conversion devices that exhibits a high transmittance gain is provided.

The invention provides a two-component high-thermal-conductivity pouring sealant and a preparation method thereof. The two-component high-thermal-conductivity pouring sealant is composed of a component A and a component B in a mass ratio of 1: 1. The component A comprises, by mass, 6 to 20 parts of vinyl silicone oil, 3 to 14 parts of hydrogen-containing silicone oil, 2 to 6 parts of dimethyl silicone oil, 0.01 to 0.04 part of an inhibitor, 0.2 to 1 part of an anti-settling agent, 3 to 25 parts of a flame retardant and 25 to 70 parts of modified silica micropowder. The component B comprises, by mass, 9 to 34 parts of vinyl silicone oil, 3 to 14 parts of dimethyl silicone oil, 0.1 to 0.5 part of a catalyst, 0.1 to 1.0 part of an anti-settling agent, 3 to 25 parts of a flame retardant and 25to 70 parts of modified silicon micropowder. According to the invention, a silane coupling agent is utilized for modifying the surface of the silicon micropowder so as to improve the compatibility between the silicon micropowder and the silicone oil and increase the filling fraction of the silicon micropowder; and at the same time, through the synergistic action of the flame retardant, the thermal conductivity of the modified silicon micropowder can be greatly performed, and the flame retardant performance of the prepared pouring sealant is improved, so the high-thermal-conductivity pouring sealant is prepared.

The present invention provides polarized electrodes that ensure a satisfactory packing ratio of activated carbon particles and conductive particulates and favorable contact between these and an electrolyte, and demonstrate high capacitance. The present invention relates to the following electrode materials for polarized electrodes: (1) electrode materials for polarized electrodes containing a rubber-based emulsion, activated carbon particles, conductive particulates, and a surfactant; and (2) electrode materials for polarized electrodes containing a dispersion of polytetrafluoroethylene, activated carbon particles, conductive particulates, and a surfactant, wherein the solid content is 25% by weight or more.

A method and system and program storage device is adapted to continuously update a perimeter of a fracture footprint created in an Earth formation when a fracturing fluid fractures the formation penetrated by a wellbore. Two embodiments of a Volume of Fluid (VOF) software, adapted to be stored in a memory of a computer system, will locate the position of a fracture perimeter during the evolution of that fracture when the software is executed by the processor of the computer system. The two embodiments, called the ‘Marker VOF (MVOF)’ and the ‘Full VOF (FVOF)’ software, will continuously update the perimeter of the fracture footprint by updating a Fill Fraction for each tip element. The MVOF software will use a fill fraction mass balance integral equation to update the Fill Fraction for each tip element, and the FVOF software will use an integrated form of fluid flow equations to update the Fill Fraction for each tip element.

The invention provides a conductive rubber roller. The conductive rubber roller comprises a metal shaft core, an elastic layer packed outside the metal shaft core and a surface layer formed outside the elastic layer, wherein the elastic layer consists of rubber A and at least one of conductive fillers filled in the rubber A; the threshold value range of the conductive fillers in the rubber is as follows: a conductive filler valve is greater than or equal to Zb and is less than or equal to Yb; and b/Yb+c/Yc+...q/Yx is greater than or equal to 1 if the filling fractions of the conductive fillers B, C,...X in the rubber A are respectively set to be b, c,...q. According to the conductive rubber roller provided by the invention, the filling number of the conductive fillers of the elastic layer is limited, and an integral resistance value of the rubber roller is adjusted according to the resistance difference between an inner layer structure and an outer structure layer, so that the conductive rubber roller is less in dependency to voltage, and is less fluctuated by the environment change, the resistance is even in distribution, and the increase of the rigidity of the rubber roller since a mass of the conductive fillers are filled into the elastic layer can be avoided; and therefore, not only can the cost of the material be reduced, but also the whole flexibility of the rubber roller can be guaranteed. The invention further discloses an imaging device which comprises the conductive rubber roller.

The invention provides a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor in which a first polarizer, a liquid crystal layer with a transparent electrode structure, and a second polarizer, are all additionally arranged on a light-sensitive component, and the arrangement of the liquid crystals between can be changed by controlling the voltage of the transparent electrode so as to control the on and off of light. A light on-off structure is added in pixel structures in the CMOS image sensor, the light on-off structure can independently control the exposure integral time of each pixel structure and also can simultaneously expose all or part of pixel structures or simultaneously stopping exposing, thereby realizing a global exposure function without influencing a filling rate of the image sensor, and the integrated level of devices is improved. Moreover, the added light on-off structures can substitute the conventional shutter apparatus, so that the volume of the light-sensitive devices is reduced.

A fiber-based supercontinuum system including: a pump laser; a ZBLAN or other fluoride-based microstructured glass fiber; and control electronics; wherein the control electronics control the pump laser to generate laser pulses into the ZBLAN or other fluoride-based microstructured glass fiber. The fabrication of a ZBLAN photonic crystal fiber with sub-micron features and large air- filling fraction and the use of the fiber to generate a stable supercontinuum (200 to 2500nm) from 140fs, 1nJ pulses at 1042nm are disclosed.

The invention relates to a magnetic wave-absorbing cement and a preparation method thereof. The magnetic wave-absorbing cement includes a ground MnZn ferrite recycled material and Portland cement. Thefilling rate of the ground MnZn ferrite recycled material is 40-70vol%, and the particle diameter D50 of the ground MnZn ferrite recycled material is to 0.6-3microm. The invention also includes a preparation method of the magnetic wave-absorbing cement. According to the invention, cement is doped with the ground MnZn ferrite recycled material, after molding curing, the cement has a 15mm thicknesswave-absorbing ability up to -15dB or more within the frequency band of 8-18GHz, and the cost is very low.

The invention discloses tea saponin modified red mud which comprises 7-13wt% of tea saponin and 87-93wt% of red mud. The tea saponin modified red mud is made by the following steps: adding red mud and tea saponin into a high-speed mixer at the temperature of 50 DEG C, stirring for 7-9 minutes, thereby obtaining the tea saponin modified red mud. The composite floor tile made from the tea saponin modified red mud and waste polydiphenyl ether plastics is made from the following raw materials in parts by weight: 14-25 parts of waste polydiphenyl ether plastics and 75-86 parts of tea saponin modified red mud. The making method of the composite floor tile comprises the following steps: drying, stirring by a stirrer, plastifying into sheets, performing mold pressing, cutting, thereby obtaining the composite floor tile. The surface property of the red mud is changed from hydrophilic to oleophilic by utilizing the tea saponin, so that the blending compatibility between the red mud and waste polydiphenyl ether and the binding property are greatly improved, and the performance of the composite floor tile is greatly improved. Meanwhile, the filling fraction of the red mud in the composite floor tile is increased, and the cost of the product is effectively reduced.

The invention provides a detachable umbrella disc structure. A circular table is defined through alternated connection of three umbrella sections a and three umbrella sections B. The circular table is provided with a through hole in the axial direction, and the through hole is matched with a core die. According to the shape of the umbrella sections A on the bottom face of the circular table, the inner arc length is larger than the outer arc length. According to the shape of the umbrella sections B on the bottom face of the circular table, the inner arc length is smaller than the outer arc length. After the circular table is defined by the umbrella sections a and the umbrella sections B, the umbrella sections a and the umbrella sections B are coaxially bonded to the position, corresponding to grain stress concentration, on the charging core die. By means of the detachable umbrella disc structure, the stress level of a solid rocket engine charging structure can be reduced, a stress releasing structure is achieved, on the premise that the charging structure filling fraction is guaranteed, the stress level of the charging structure can meet the requirement for the integrity of a low-temperature work structure of an engine, and the problem about integrity of the engine low-temperature work charging structure is solved.

Interstitial voids of the cubic CoSb₃ type skutterudite structure can be filled with sodium and/or potassium atoms. Such filled skutterudites have the general formulas, K_yCo₄Sb₁₂ and Na_yCo₄Sb₁₂, where y indicates the filling fraction of potassium and sodium, respectively, in the CoSb₃ cubic crystal structure, and has a value greater than zero and less than one. Also sodium-filled and/or potassium-filled skutterudites of the general formula, (K, Na)_yT₄Pn₁₂ are made, where T denotes Fe, Ru, Os, Co, Rh, or Ir; and “Pn” denotes one of the pnicogen elements P, As, or Sb. Again, y has values less than one.

The invention relates to the technical field of nano-composite materials, and aims at providing a preparation method of a magnesium oxide/polystyrene composite dielectric material. The method comprises the following steps: adding polystyrene to N,N-dimethylformamide, and stirring the polystyrene and N,N-dimethylformamide to obtain a transparent and clarified solution; dispersing magnesium oxide in a transparent and clarified solution to obtain a uniform suspension; and carrying out tape casting on the suspension, and drying the suspension at a temperature of 60 DEG C to obtain the film-like magnesium oxide/polystyrene composite dielectric material. The uniform distribution characteristic of the electric field in the magnesium oxide and polystyrene is used to improve the comprehensive dielectric properties of the composite material at a low filling volume. The preparation method has the advantages of simplicity, high operability, easiness in obtaining of raw materials, and suitableness for industrial production. The dielectric properties of the polymer-based composites can be adjusted by adjusting the volume fraction of a filled inorganic filler. The filled volume of the inorganic filler is small, and when the filling fraction is only 8%, the dielectric properties are improved, and the good toughness of the polymer can be kept.

The invention discloses tea saponin modified blast furnace slag which is prepared from 7-12wt% of tea saponin and 88%-93wt% of blast furnace slag. A preparation method for the tea saponin modified blast furnace slag comprises the following steps: adding the blast furnace slag and the tea saponin into a high-speed mixer at a temperature of 70 DEG C, and stirring for 7-9 minutes to obtain the tea saponin modified blast furnace slag. A composite floor brick prepared from the tea saponin modified blast furnace slag and waste polyformaldehyde plastic is prepared from the following raw materials in parts by weight: 15-20 parts of waste polyformaldehyde plastic and 80-85 parts of the tea saponin modified blast furnace slag; and the raw materials are dried, are stirred by a stirrer, are plastified into sheets, are subjected to mould pressing and are cut into sheets, so that the composite floor brick is formed. The surface property of the blast furnace slag is changed into lipophilicity from hydrophily through tea saponin, so that the co-blending compatibility and associativity of the blast furnace slag and the waste polyformaldehyde are improved greatly, and therefore, performances of the composite floor brick are improved greatly; and meanwhile, filling fraction of the blast furnace slag in the composite floor brick is increased, so that product cost is effectively reduced.