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856results about How to "Small dispersion" patented technology

Multi-head miniature test specimen creep experiment device and test method

The invention provides a multi-head miniature test specimen creep experiment device and a multi-head miniature test specimen creep test method. The device comprises a loading system, a clamping system, a heating and temperature control system, a measuring system and an external support frame, wherein the loading system adopts the poise top vertical loading and is positioned at the upper part of the external support frame, the clamping system is fixedly arranged on the external support frame, is positioned at the lower part of the loading system and is placed inside the heating system, the heating system is connected with the bottom of the external support frame and is externally connected with the temperature control system, the measuring system is connected with the loading system and the external support frame and is placed at the upper part of the support frame, and all independent parts are connected into a multi-head creep device system by the external support frame. The experiment device and the test method have the advantages that the problem that the existing creep experiment device cannot carry out multi-head miniature test specimen creep experiments under the low-load condition is solved, the test method and the device capable of simultaneously carrying out creep experiments on a plurality of identical or different-size miniature test specimens under the certain work condition are provided, and the creep experiments in different types such as cantilever beam test specimens, three-point bending, four-point bending and small punch test can also be realized through replacing clamps.
Owner:EAST CHINA UNIV OF SCI & TECH

Dispersion shifted optical fiber

A dispersion-shifted optical fiber (DS-fiber) is structured so that it has nearly zero chromatic dispersion in the 1.55 mu m wavelength band and, at the same time, achieves both reduced non linear effects and low dispersion slope. In particular, dispersion slope is reduced to a level sufficient for the fiber to be used for wavelength division multiplexing (WDM) applications. The properties of the fiber are developed such that chromatic dispersion in the 1.55 mu m band is nearly zero but not zero, effective cross section area is 45 DIFFERENCE 70 mu m2, bending loss is 0.1 DIFFERENCE 100 dB / m, dispersion slope is 0.05 DIFFERENCE 0.08 ps / km / nm2, and the cutoff wavelength is such that transmission is always single-mode transmission within the 1.55 mu m band. Such a DS-fiber has sufficiently large effective cross section area Aeff, low bending loss and small dispersion slope to make the fiber suitable for use in WDM transmission systems.
Owner:FUJIKURA LTD

Low-temperature early-strength high-strength underwater grouting material

ActiveCN105622006AEnhance early compressive strengthImprove early strengthCalcium silicateWater reducer
The invention provides a low-temperature early-strength high-strength underwater grouting material. The low-temperature early-strength high-strength underwater grouting material consists of the following ingredients in parts by weight: 30-45 parts of ordinary Portland cement, 45-60 parts of fine aggregate, 5-10 parts of mineral powder, 2-4 parts of encryption silica fume, 0.5-1 part of a compound expanding agent, 0.2-0.5 part of an early-strength powdery water reducer, 0.1-0.5 part of nano hydrated calcium silicate, 0.3-0.5 part of a compound early-strength agent and 0.1-0.3 part of a dispersion-resistant compound. The low-temperature early-strength, low-temperature high-strength and dispersion resistant properties of the low-temperature early-strength high-strength underwater grouting material in water are improved at the same time in the four aspects of reducing the void ratio of the aggregate, optimizing the expanding components and improving the nano early strength and the dispersion resistance, the construction performance, such as the water holding performance and the viscosity, of the grouting material are remarkably improved, the 1d strength and the 28d strength of the grouting material under the undersea low-temperature condition are effectively improved, and the underwater dispersion resistance of the grouting material can be greatly improved. The low-temperature early-strength high-strength underwater grouting material has favorable low-temperature early-strength, low-temperature high-strength and underwater dispersion resistant functions.
Owner:JIANGSU SOBUTE NEW MATERIALS

Catalyst for carbon dioxide methanation and preparation method thereof

The invention discloses a catalyst for carbon dioxide methanation and a preparation method of the catalyst, belonging to the technical field of carbon dioxide methanation. The catalyst for carbon dioxide methanation is composed of a composite carrier and an active ingredient at a ratio of 84-90wt%:10-16wt%, wherein the composite carrier is composed of gamma-Al2O3 and water soluble metal oxide at a mass ratio of 77-86:2-10; and the active ingredient is Ni which exists in the catalyst in a form of NiO. The catalyst is high in activity, low in cost and better in stability, and can be used for carbon dioxide methanation reaction under normal pressure condition.
Owner:SICHUAN UNIV

Carbon ceramic braking pad for high-speed train and preparation method of carbon ceramic braking pad

ActiveCN103511525ALess impact on friction and wear propertiesHigh and stable coefficient of frictionFriction liningFiberCeramic composite
The invention relates to a carbon ceramic braking pad for a high-speed train and a preparation method of the carbon ceramic braking pad. The carbon ceramic braking pad is made of carbon ceramic composite material; the carbon ceramic composite material comprises the following components in percentage by mass: 16-30 percent of carbon fibers, 20-36 percent of pyrolytic carbon, 28-46 percent of silicon carbide, 6-12 percent of molybdenum disilicide and 2-6 percent of simple substance silicon; the density of the carbon ceramic composite material is 1.8-2.4g/cm<3>; the carbon fibers are uniformly distributed in the carbon ceramic composite material in a three-dimensional network structure. According to the invention, after the high-temperature heat treatment is performed on a carbon fiber felt with the density of 0.20-0.65g/cm<3>, the pyrolytic carbon is generated in the carbon fiber felt through the thermal-gradient chemical vapor deposition carburizing treatment, then the catalytic graphitization treatment, non-immersion type melting infiltration and assembly are performed, so that the carbon ceramic braking pad for the high-speed train is obtained.The carbon ceramic braking pad is simple in preparation technology, moderate in friction coefficient, good in abrasion performance, stable in braking and strong in environmental suitability and can meet braking requirements of the high-speed train with the speed of 200Km/h.
Owner:HUNAN SHIXIN NEW MATERIALS CO LTD

Ultrasonic length measuring apparatus and method for coordinate input

An ultrasonic length measuring apparatus measures the number of times a waveform of an ultrasonic wave signal crosses a threshold value, detects the crossing timing at, for example, a waveform having a maximal amplitude after a predetermined number of times counting from a first crossing point, measures the time period from the transmission start of the ultrasonic wave by the transmission unit to the detected crossing timing and calculates the length based on the time measured. A coordinate inputting apparatus includes a pen for transmitting an ultrasonic wave and a coordinate inputting apparatus for inputting coordinate positions of the pen based on a propagation time of the ultrasonic wave transmitted by the pen and received by a plurality of ultrasonic wave receivers. The receiver includes at least a pair of ultrasonic receivers for receiving the ultrasonic wave transmitted by the pen.
Owner:FUJITSU LTD

Liquid crystal display

A liquid crystal display includes a first substrate having a first electrode and a first alignment film, a second substrate having a second electrode and a second alignment film, and a liquid crystal layer having liquid crystal molecules between the first and second substrates. The liquid crystal layer is doped with a chiral material that tends to induce a twist in directors of the liquid crystal molecules when an electric field is applied to the liquid crystal layer using the first and second electrodes. The first alignment film has a first alignment direction, the second alignment film has a second alignment direction, and the first and second alignment films have orientations that tend to induce a twist in the directors when an electric field is applied to the liquid crystal layer, in which the direction of twist induced by the first and second alignment films is different from the direction of twist induced by the chiral material. The display includes a reflective layer to reflect external light that passes a first portion of the liquid crystal layer. The external light is modulated by the first portion of the liquid crystal layer.
Owner:INNOLUX CORP +1

Magnetic recording medium and hard disk drive using the same, and manufacturing method thereof

A magnetic recording medium, a hard disk using the same, and a manufacturing method thereof are provided. In one example, the magnetic nano-particle medium is formed by depositing a magnetic nano-particle colloid on a substrate, wherein the axes of easy magnetization of respective crystalline particles are aligned with high accuracy. A layer of L10 alloy nano-particles which will exhibit magnetic properties through an order-disorder transition, and arranged at a substantially uniform spacing on a substrate, and a carbon-containing covering film for surrounding these nano-particles and making the spacing substantially uniform are provided. To the L10 alloy of the nano-particles, at least one non-magnetic element is added, or a covered layer comprising at least one non-magnetic layer is formed therearound. This makes it possible to implement a magnetic recording medium wherein the average diameter of nano-particles is small, and the nano-particle diameter dispersion is small, and the axes of magnetic anisotropy are aligned.
Owner:HITACHI LTD
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