Method for producing silicon film piezoresistance and pressure sensor

High-abrasion-resistant corrosion-resistant inorganic particle crosslinking polyethylene composite material and preparation method thereof

The invention relates to a crosslinking polyethylene composite material and a preparation method thereof, in particular to a high-abrasion-resistant corrosion-resistant inorganic particle crosslinking polyethylene composite material and a preparation method thereof. The high-abrasion-resistant corrosion-resistant inorganic particle crosslinking polyethylene composite material consists of a component A and a component B, wherein the component A comprises 100 percent of linear low-concentration polyethylene, 10-30 percent of polyethylene modifying agent and 0.1-5 percent of antioxygen; the component B comprises 30-70 percent of high-concentration polyethylene, 70-30 percent of linear low-concentration polyethylene, 10-30 percent of ultrafine Al2O3, 5-15 percent of nanometer MoS2, 0.1-1.0 percent of scattered lubricant, 0.2-0.5 percent of surface treating agent, 0.1-1 percent of cross-linking agent and 0.2-1.5 percent of auxiliary crosslinking agent. The basic resin adopted in the invention ...

Application of ASB17 in preparation of medicine for preventing or treating inflammation caused by salmonella typhimurium plague

The invention belongs to the technical field of biomedicine, and discloses application of ASB17 in preparation of a medicine for preventing or treating inflammation caused by salmonella typhimurium plague, and ASB17 plays a role by inhibiting activation of NLRC4 inflammasomes. The ASB17 plays a role in inhibiting the maturation and secretion of a proinflammatory factor pro-IL-1beta. According to the invention, the function and mechanism of the ASB17 in the infection of the salmonella typhimurium plague are defined, and the ASB17 is found to be capable of inhibiting the inflammatory reaction in the infection process of the salmonella typhimurium plague. An experimental basis is provided for revealing a new function of ASB17, and a theoretical basis is provided for developing a new antiviral or anti-inflammatory target spot. The invention clarifies the mechanism of ASB17 for inhibiting the activation of Salmonella plague mediated NLRC4 inflammasome, and provides a new anti-inflammatory protein ...

Optical fibre thermosensitive device and its manufacture method

High-liquidity high-glossiness flame retardant toughened polypropylene material and preparation method thereof

The invention relates to a high-liquidity high-glossiness flame retardant toughened polypropylene material and a preparation method thereof. The material comprises the following components in parts by weight: 100 parts of polypropylene, 5-10 parts of a toughening agent, 1-5 parts of graft, 10-20 parts of high-glossiness barium sulfate, 10-14 parts of a flame retardant, 5-7 parts of an auxiliary flame retardant, 0.05-0.2 part of a nucleating agent, 0.2-0.4 part of an antioxidant, 0.2-0.4 part of a surface treating agent, 0.2-0.5 part of a dispersing lubricant and 0.03 part of a fluorescent whitening agent. The preparation method comprises the following steps: firstly, mixing the surface treating agent, the dispersing lubricant, the high-glossiness barium sulfate, the flame retardant and the auxiliary flame retardant; then, mixing the polypropylene, the toughening agent, the graft, the nucleating agent, the antioxidant and the fluorescent whitening agent with the mixture; and finally, extruding ...

Delay time measuring circuit for optical fiber delay line

The invention provides a delay time measuring circuit for an optical fiber delay line. Narrow-pulse lasers emitted by a laser unit of a laser pulse transmitting part are divided into two paths through an optical fiber branching device. A laser pulse receiving part comprises photoelectric detectors, automatic gain control circuits and moment discriminator circuits, wherein the photoelectric detectors, the automatic gain control circuits and the moment discriminator circuits are all arranged in two same sets. One path of lasers directly enter the first photoelectric detector, and the other path of narrow-pulse lasers enter the second photoelectric detector through the optical fiber delay line to be measured. Two paths of converted electric signals are connected to the corresponding moment discriminator circuits through the corresponding automatic gain control circuits respectively. Output of the first moment discriminator circuit and output of the second moment discriminator circuit are connected ...

微机械光开关阵列

... 介绍一种光纤通信用的微机械光开关阵列，其基本构成为一块(110)晶向的硅单晶衬底。该衬底集成有若干(111)结晶面反射镜平板，每块反射镜平板由一块弹性硅片支持。该衬底还集成有空腔，垂直深槽，阻挡块，和微型沟渠等。反射镜平板通过垂直深槽与硅衬底纵向分开，阻挡块处于空腔与垂直深槽连通处。垂直深槽引导反射镜平板上下移动，而阻挡块限定反射镜平板移动的最大高度。微型沟渠内布置有自动对准反射镜平板的光纤和圆柱形透镜。 ...

一种制造机械调制式发射和接收模块的方法

... 介绍一种制造机械调制式发射和接收模块的方法。调制用的法布里-珀罗腔由多晶硅三叠层结构刻蚀而成。调制器的柔性薄膜由上层多晶硅形成，中层多晶硅转变成多孔多晶硅后腐蚀去除，从而使上层多晶硅悬空。悬空的上层多晶硅最后释放由反应离子腐蚀实现。多晶硅叠层结构下的硅片内集成有圆锥形状的光纤插入孔，该孔由多孔单晶硅技术形成。光纤一旦插入即能自动对准安置于腔体上的光电探测器。该方法具有结构简单，运作方便，可靠性高，且制造成本低等优点。 ...

Modified thermoplastic polyester elastomer and preparation method thereof

The invention relates to a thermoplastic polyester elastomer and a preparation method thereof, particularly relates to a modified thermoplastic polyester elastomer and a preparation method thereof, and belongs to the technical field of a high polymer material. The modified thermoplastic polyester elastomer comprises the following components in parts by weight: 100 parts of aromatic dimethyl isophthalate, 50-250 parts of aliphatic glycol, 50-300 parts of polyether, 1-10 parts of chain extender, 0.1-1 part of catalyst, 10-500 parts of modified material, and 5-20 parts of processing aid. By adopting the added addition-type chain extender, the melt viscosity of the polymer is improved. Thus, the dispersion effect of the modified material and the binding force with base resin can be improved by adopting a technology of solid phase polycondensation after modification, so that the obtained product is more excellent in performance.

Hot-air ink-jet printing head with high heat-transferring efficiency

The high-efficient thermal transmission hot-air ink jet printing head is characterized by that its heating resistor is formed from monocrystalline silicon zones partitioned by heat-insulation medium wall, the undersurface of monocrystalline silicon zone is a part of pipe wall of capillary pipe, and the heat quantity of heating resistor can be directly flowed into ink of capillary pipe by means of monocrystalline silicon zone. Said printing head is made up by processing porous silicon, and its preparation process mainly includes the following steps: utilizing anodic oxidation in HF solution to convert the heavily-doped buried layer in monocrystalline silicon into porous silicon; and utilizing high-temp. thermal oxidation to convert the porous silicon into porous silicon oxide, and utilizing its anti-corrosive property for resisting silicon corrosive solution, it can be used as stopping layer of silicon anisotropic chemical corrosion, and utilizing the property of that it is easy to becorroded ...

Silicon beam press-resistance accelerate speed sensor and making method

SILICON-PIEZOELECTRIC ACCELERATION SENSOR AND MANUFACTURE THEREOF

Single-crystal silicon micro-machinery manufactured capacitor type microphone and method for manufacturing same

A capacitance microphone for monocrystalline micro-mechanical working, which contains flexible plane board, rigidity plane board and support frame part for forming internal air isolation, and made ofepitaxy monocrystalline layer, the working process containing medium pattern epitaxy growth and monocrystalline growth, the formation of microstructure adopting the micro-mechanical working of monocrystalline selective formation and corrosion, said invention adopts homogeneous monocrystalline material to eliminate the problem resulting from thermal-mismatching by dissimilar material.

Infrared FABRY-PEROT filter used for fine processing procedure

The present invention relates to an infrared FABRY-PEROT colour filter, including silicon slice, rectangular cavity formed in the silicon slice, rectangular silicon film stretched on the cavity and supported by silicon slice, reflector attached to the lower portion surface of the silicon film and reflector attached to the bottom portion surface of the cavity, piezoelectric resistors made on two opposite fixed edge portions of the rectangular silicon film, piezoelectric resistor made on the middle portion of the rectangular silicon film, electric film stretchers attached to the upper portion surfaces of two opposite fixed edge portions of the rectangular silicon film and anti-infrared reflecting film attached to the upper portion surface of the middle portion of the rectangular silicon film. The movement of the reflector is driven by electric film stretcher, and the movement control and reflector plane performance regulation are executed by piezoelectric resistors.

SILICON FILM PRESSURE SENSOR AND ITS MANUFACTURING METHOD

High-abrasion-resistant corrosion-resistant inorganic particle crosslinking polyethylene composite material and preparation method thereof

The invention relates to a crosslinking polyethylene composite material and a preparation method thereof, in particular to a high-abrasion-resistant corrosion-resistant inorganic particle crosslinking polyethylene composite material and a preparation method thereof. The high-abrasion-resistant corrosion-resistant inorganic particle crosslinking polyethylene composite material consists of a component A and a component B, wherein the component A comprises 100 percent of linear low-concentration polyethylene, 10-30 percent of polyethylene modifying agent and 0.1-5 percent of antioxygen; the component B comprises 30-70 percent of high-concentration polyethylene, 70-30 percent of linear low-concentration polyethylene, 10-30 percent of ultrafine Al2O3, 5-15 percent of nanometer MoS2, 0.1-1.0 percent of scattered lubricant, 0.2-0.5 percent of surface treating agent, 0.1-1 percent of cross-linking agent and 0.2-1.5 percent of auxiliary crosslinking agent. The basic resin adopted in the invention ...

Recombinant baculovirus, SjHMGB1 recombinant protein expressed by same and application

The invention discloses a recombinant baculovirus. The recombinant baculovirus comprises a nucleotide sequence encoding an SjHMGB1 protein amino acid sequence shown in SEQ ID NO. 1. The recombinant baculovirus is capable of successively expressing SjHMGB1 recombinant protein in an insect cell, the conformation of the recombinant expressed SjHMGB1 protein is close to the conformation of natural protein, and the recombinant expressed SjHMGB1 protein has good biological characteristics and is suitable for being used as an anti-schistosome vaccine.

Targeting nano level liposome ultrasonic contrast agent and preparation method thereof

The invention discloses a targeting nano level liposome ultrasonic contrast agent, which is composed of egg yolk lecithin, distearoyl phosphatidylcholine, palmitic acid, and cholesterol according to a mole ratio of 10-25:50-70:1-15:5-25, preferably the mole ratio is 15-20:55-65:5-10:10-20, and more preferably the mole ratio is 17:60:8:15. The preparation method comprises the following steps: preparing a nano level liposome ultrasonic contrast agent in advance, and then coupling an IL-8 monoclonal antibody to the prepared nano level liposome through a heterobifunctional crosslinking agent crosslinking method so as to obtain the targeting nano level liposome ultrasonic contrast agent. The contrast agent and preparation method thereof provide methodology and a substance base for targeting nano level liposome contrast technology applied in the diagnosis and treatment of diseases caused by high expression of IL-8 in the early stage.

高传热效率的热汽喷墨打印头及其制造方法

... 一种高效热传输的热汽喷墨打印头，其加热电阻器由隔热介质墙分割的单晶硅区形成，单晶硅区的下表面为毛细管管壁的一部分，加热电阻的热量直接由单晶硅区流入毛细管的墨水。该打印头的制造以多孔硅加工为基础。主要包括：通过在HF溶液中的阳极氧化，将单晶硅中重掺杂的埋层转变成多孔硅；通过高温热氧化将多孔硅转变成氧化多孔硅；利用氧化多孔硅耐硅腐蚀液腐蚀的特性，用作硅各向异性化学腐蚀的停止层；利用氧化多孔硅易被缓冲HF溶液腐蚀的特性，选择腐蚀氧化多孔硅。 ...

Optical fibre thermosensitive device and its manufacture method

An optical-fibre thermosensitive device comprises a thermal expansion element, a reflector thereon, an optical-fibre guide channel with several pairs of location wall skeleton and vertically connected to reflector, and a single-mode optical fibre inserted in the channel. Said thermal expansion element, channel and wall skeleton are made on silicon substrate by anisotropic etching, and reflecting layer including silicon nitride, Ti and Au is deposited on oxide layer by chemical gas-phase deposition. Cover sheet is stuck by anode sticking process. Optical fibre is inserted in channel and fixed by heat treatment of copolymer.

Double-electrode monocrystal silicon capacitance acceleration sensor and mfg. method therefor

The present invention relates to a double-electrode monocrystal silicon capacitance acceleration transducer, including a mass block, at least two spring beams, several fine-long pieces, formed from silicon epitaxial layer with holed bottom, stand supporting spring beams, its upper portion is formed of silicon epitaxial layer, and its lower portion is isolated from the substrate by means of oxidized layer, and possesses electric-insulating action; the side surface of the fine-long piece is used for making moving electrode of transverse variable capacitor, the mass block and the bottom surface of fine-long piece are used for making moving electrode of longitudinal variable capacitor, and the fixed electrode of the transverse variable capacitor is formed of several fine-long pieces electrically insulated from substrate and rigid-connected with substrate, and the fixed electrode of longitudinal variable capacitor is formed from substrate surface.

Marbleized rotational moulding special material and preparation method thereof

The invention relates to a rotational moulding special material and a preparation method thereof, in particular to a marbleized rotational moulding special material and a preparation method thereof. The marbleized rotational moulding special material comprises the following components by weight percent: 40-70% of basic resin and 30-60% of marbleized resin, wherein the basic resin is linear low density polyethylene; and the marbleized resin comprises the following components by weight percent: 98% of high density polyethylene, 0.1-1% of pigment, 0.1-0.5% of antioxidant, 0.1-0.5% of light stabilizer, 0.1-0.5% of lubricant and 0.1-1.0% of antistatic agent. In the preparation method in the invention, the differences of the flow rate and melting point of the high density polyethylene melt and low density polyethylene melt are utilized to control the partical size and particle size distribution of the basic resin and marbleized fancy particles and ensure that the marbleized particles are distributed ...

High-cohesiveness and high-temperature-resisting polypropylene anticorrosive paint, as well as preparation method and painting method thereof

The invention discloses a high-cohesiveness and high-temperature-resisting polypropylene anticorrosive paint, as well as a preparation method and a painting method thereof. The paint is prepared from the following raw materials in parts by mass: 100 parts of polypropylene, 5-10 parts of an elastomer, 5-15 parts of a graft, 5-10 parts of waste tire powder, 0.2-0.4 part of an antioxidant, 0-5 parts of a high-efficiency heat transferring agent and 0-0.4 part of a dispersing lubricant. The preparation method of the paint comprises the following steps: mixing and stirring polypropylene and the other ingredients, extruding through an extruder, grinding the extruded particles into powder and finally painting. According to the composite paint disclosed by the invention, polypropylene is taken as base resin; in comparison with the existing commonly used polypropylene, the paint material is more excellent in rigidity and hardness, also excellent in toughness and creep resistance, free of drop and ...

Heat-flow sensor of integrated Si-membrane and making method thereof

Front ink-jet single-chip integrated hot vapor ink-jet printing head and making method thereof

Negative voltage control circuit and method, memory and electronic equipment

The invention relates to a negative voltage control circuit and method, a memory and electronic equipment, and belongs to the field of electronic circuits. The negative voltage control circuit comprises a voltage detection module and a control module. The voltage detection module is used for being connected with a data line of a storage unit, and the voltage detection module is used for detecting the voltage of the data line; the control module is connected with the voltage detection module and the negative voltage generation circuit, the control module is used for controlling the negative voltage generation circuit to be turned on when the voltage of the data line is lower than a preset voltage, so that the negative voltage generation circuit pulls down the voltage of the data line to a negative voltage, and the control module is used for controlling the negative voltage generation circuit to be turned on when the voltage of the data line is lower than the preset voltage. The preset voltage ...

Honey green juice jelly capable of being sucked and preparation method of honey green juice jelly

The invention discloses honey green juice jelly capable of being sucked and a preparation method of the honey green juice jelly. The honey green juice jelly is prepared from barley leaf green juice powder, water, honey, xylooligosaccharide, zinc acetate, zinc gluconate, potassium sorbate and a glue solution. The honey green juice jelly capable of being sucked, provided by the invention, is delicious in taste, and can promote the proliferation of inherent beneficial bacteria namely bifidobacteria in intestinal tracts of human bodies; white granulated sugar is not added, so that the energy of foods is reduced, and the health-care effects are improved.

Method for preparing high-toughness high-strength polypropylene material through in-situ compatibilization

The invention relates to a method for preparing high-toughness high-strength polypropylene material through in-situ compatibilization. The method comprises the steps of uniformly mixing polypropylene, ethylene-octylene copolymer, grafted polar monomers and initiators in a mixer, then uniformly mixing superfine inorganic mineral powder, surface treating agents, dispersion lubricating agents and antioxidants in a mixer, adding the mixtures into an extruder separately, reacting and mixing at 170-230 DEG C, extrusion granulating, and carrying out post-devolatilization on the materials in a drum tackifying machine, wherein a vacuum pump is started to carry out primary devolatilization during the extrusion process. According to the method, modified fillers and auxiliaries are added in the polypropylene grafting reaction extruding process, the method belongs to the in-situ compatibilization process for improving the toughness and the strength, the traditional process in which the polypropylene ...

SILICON FILM CAPACITOR PRESSURE SENSOR AND ITS MAKING METHOD

Capacitor type pressure sensor for single chip single crystal silicon micromechanical processing

Thermal sensor using micro machining heat separation structure and preparation thereof

The disclosed thermal isolation structure comprises: a silicon slice with a flat-bottom cavity, a porous mono-crystal silicon layer above the cavity, a SiO2 film on last layer surface, and the closedmono-crystal silicon layer on side and bottom of the porous silicon layer, wherein the porous silicon layer includes a central rectangular part and the edge extent part with one end fixed on the silicon slice surface and another end connected with the rectangular part. This invention can be used to manufacture different sensors all with well performance and low cost.

Infrared ray Fabry-perot filter for fine processing procedure and method for manufacturing the same

Thermal motion sensing indicator

The invention relates to a heat motion sensing indicator used to trace motion object. Its operation comprises following steps: heating units in motion state generating thermal field skew in the opposite direction to motion; temperature difference appearing in each symmetric position centralized by heating units; after measuring difference and converting it to electrical signals, motion direction, speed and acceleration being got.Based on a heat motion sensor, we design such three kinds of heat motion indicatior as a two-dimensional table heat motion sensing indicator or mouse, a three-dimensional table heat motion sensing indicator and a three-dimensional space heat motion sensing indicator.

Mechanically modulated WDM transmitting and receiving module

A technology for preparing Fabry-Perot photomechanical modulator and the WDM transmitting-receiving module is disclosed. Said Fabry-Perot cavity is formed by etching on three-layer polysilicon structure. The flexible film of modulator is formed by top layer of polysilicon. The middle layer of silicon is converted to porous polysilicon and then etched out to make the top layer of polysilicon is suspended state. A conic optical fibre jack is integrated in the silicon chip under said multi-layer structure. The inserted optical fibre can be automatically aligned to the photoelectric detector in cavity.

HEAT-FLOW SENSOR OF INTEGRATED SI-MEMBRANE AND MAKING METHOD THEREOF

This sensor features use of a silicon film acting as heat insulation, which is suspended over an empty cavity formed on a silicon chip by deducting a hole on it and supported by wall of the cavity. The silicon resistor as heater and the Si/Al thermocouple as heat detector are respectively made on the silicon film which is made up by such technologies as diffusion or ion implantation, silicon epitaxy, anodizing, etching porous silicon, and physical or chemical gas-phase depositing insulating medium. The device made according to this invention has high sensitivity and fast response.

SILICON FILM CAPACITOR PRESSURE SENSOR AND ITS MAKING METHOD

The cavity under the silicon film of the invented plane inserted capacitive sensor is a sealed chamber formed by hollowing out the silicon body from the front of the silicon chip, the electrodes of the capacitor are separately made on the under surface of silicon film in the chamber and the bottom face of the chamber, the upper and lower electrodes and the silicon film are isolated and supported with insulating medium. It is prepared by adopting such processes as difusion or ion implantation, epitaxy, anodic oxidation, etching porous silicon, and physical or chemical gas phase deposit. The preparation process is compatible with the plane process. its advantages are easy for integration and large batch production, low cost, and good property of device.

Teflon pipeline with double composite steel liners

The invention discloses a Teflon pipeline with double composite steel liners. The Teflon pipeline comprises a steel pipe and a Teflon pipeline body. An intermediate layer is hot-melted between the steel pipe and the Teflon pipeline body, and flanges are disposed at two ends of the steel pipe. The Teflon pipeline is both positive-pressure resistance and negative-pressure resistance, the shortcoming that a conventional Teflon pipeline with the steel liners is not resistant to negative pressure is overcome, reliability of products in use is guaranteed, and broad development prospect and social and economy benefits are achieved.

Preparation method of iridium ruthenium-based electrocatalyst for PEM water electrolysis anode oxygen evolution

The invention relates to a preparation method of an iridium ruthenium-based electrocatalyst for PEM water electrolysis anode oxygen evolution, and belongs to the technical field of electrochemistry and new energy. The method mainly solves the problems of poor performance repeatability, poor catalytic activity and poor stability of the catalyst in the use process due to many valence states of an active component iridium in the preparation process of the iridium ruthenium-based catalyst. The iridium ruthenium-based electrocatalyst is prepared by adopting a normal-temperature liquid phase assisted thermal oxidation method, a proper amount of auxiliary reducing agent is creatively added before the reduction reaction, the catalytic activity is greatly improved while the synthesis process is simplified, and finally the carrier-free IrRuOx catalyst with good catalytic performance and good repeatability is prepared. The method is simple, short in preparation time and high in reproducibility, and ...

Crosslinked polypropylene viscoelastic composite coating and preparation method thereof

The invention relates to a crosslinked polypropylene viscoelastic composite coating and a preparation method thereof. The coating is prepared from components A and B by mixing, and the weight ratio of the component A to the component B is 9:1; the component A comprises the following ingredients in parts by mass: 100 parts of polypropylene, 0.05-0.2 part of an initiator, 10-20 parts of a graft, 3-5 parts of silane, 3-8 parts of an elastomer, and 0.1-0.5 part of a grafting aid; the component B comprises the following ingredients in parts by mass: 100 parts of polypropylene, 2-10 parts of a heat conducting agent, 0.1-1 part of a dispersing lubricant, 0.3-0.5 part of a surface treatment agent, 0.4-1 part of a catalyst, 1-3 parts of a dehydrating agent, and 0.1-0.4 part of an antioxidant. A base resin of the composite coating is crosslinking polypropylene which both ensures the sufficient crosslinking efficiency and reduces the crystallinity and shrinkage distortion arising from the reduction ...

Single chip integrated heat vapor ink-jet print head

A single-chip integrated ink jet print head features that its all elements comprising circuit, ink well, ink micro-rail, ink jet, heating resistor and driver circuit are integrated on only silicon chip. Said heating resistor is supported by silicon film with big transverse thermoresistance and the dismatched thermal stress of silicon film is minimized via elastic film. The print head is made up through diffusion of buried layer, epitaxial growth, forming circuit and resistor, anodizing, coating elastic film, covering rigid piece, and etching. Its advantages are high integrated degree, resolution and reliability, low power consumption, and long service life.

Work order distribution method and equipment

The invention relates to the field of personnel scheduling, in particular to a work order allocation method and equipment. The method comprises the following steps: determining N random allocation schemes; screening M random distribution schemes with the shortest construction duration from the N random distribution schemes; determining a pheromone table of the ith constructor according to the number of times that the ith constructor allocates the work orders 1, 2,... X in the M random allocation schemes; using an ant colony algorithm to iterate the pheromone table, each iteration comprising: determining a redistribution scheme according to the pheromone table, and recalculating the pheromone table of each constructor; and determining a target allocation scheme according to the pheromone table of the constructors at the end of the iteration of the ant colony algorithm. According to the work order allocation method provided by the embodiment of the invention, factors such as work order types ...

Micromechanical light switch array

In the present invention, disclosed is one kind of micromechanical light switch array with one silicon monocrystal substrate in crystal orientation as basic constituent component and used for fiber communication. On the substrate, there are several integrated reflecting mirror plates in crystal plane and the reflecting mirror plates is supported by one elastic silicon chip. On the substrate, there are also integrated cavity, perpendicular deep slot, barrier block, micro channel, etc. The reflecting mirror plates are separated from the substrate by the deep slot and the barrier block is in thecommunicated part between the cavity and the deep slot. The deep slot leads the reflecting mirror plates to shift up and down while the barrier block limit the maximum shift height. In the micro channel, there are fiber and cylindrical lens for automatic alignment of the reflecting mirror plates.

All silicon integrated flow sensor and method for manufacturing the same

This invention puts forward a total silicon integrated flow sensor and its manufacturing method including a silicon monocrystal substrate inserted with a porous monocrystal silicon trap, two sets of thermal couple stacks are arrayed in it, composed of several n-like doped monocrystal silicon strips, p-doped polysilicon strips matched in pairs, polysilicon doped heating elements, temperature test element and an amorphous silicon carbide passive layer. The porous monocrystal trap provides a heat isolation base for heating elements so as to set up large temperature gradient with small power consumption. The thermal couple stack is for testing the temperature gradient variances caused by varying mean flow rate.

Methanol fuel cell anode catalyst and preparation method thereof

The invention discloses a methanol fuel cell anode catalyst and a preparation method thereof. The platinum loading capacity of the catalyst is 31%-51%, the ruthenium loading capacity is 16%-26%, and the total loading capacity of platinum and ruthenium is 47%-77%. The catalyst is prepared by pre-loading a carbon black carrier with a ruthenium compound and loading a platinum-ruthenium alloy with the ruthenium compound on the carbon black carrier as an anchoring point, the catalyst controls loading of platinum and ruthenium through RuO2 pre-loaded on the carbon black carrier, and through slow reduction reaction, the platinum-ruthenium alloy is formed while independence of RuO2 is kept; the synthesis yield of the catalyst reaches 95% or above. The catalyst disclosed by the invention has high catalyst activity, stability and poison resistance when being used for catalyzing methanol electrooxidation reaction, and has a wide application prospect in direct methanol fuel cells.

High-impact high-stiffness polypropylene rotational molding material and preparation method thereof

The invention relates to a high-impact high-stiffness polypropylene rotational molding material and a preparation method thereof. The rolling plastic rotational molding material comprises the following raw materials: by weight, 100 parts of polypropylene, 0-30 parts of polyethylene, 0-0.1 part of a crosslinking agent, 0-0.15 part of an auxiliary crosslinking agent, 1-10 parts of an elastomer, 0.1-0.5 part of an antioxidant, 0-10 parts of a nano filler, 0.1-0.5 part of a dispersing lubricant and 0-0.4 part of a surface treatment agent. According to the invention, the crosslinkable polyethylene is added in a polypropylene melt mixing process for melt curing to obtain the high-impact high-stiffness polypropylene modified rotational molding material with a semi interpenetrating network structure, and the high-impact high-stiffness polypropylene modified rotational molding material can meet the material requirements of vehicles and other different fields. The curing reaction of the polyethylene ...

High-toughness and high-strength polyethylene composite material and preparation method thereof

The invention relates to a polyethylene composite material and a preparation method thereof, in particular to a high-toughness and high-strength polyethylene composite material and a preparation method thereof. The high-toughness and high-strength polyethylene composite material comprises the following components in percentage by weight: 60-85 percent of polyethylene, 5-30 percent of phenolic resin, 0.4-3 percent of curing agent, 3-15 percent of compatilizer, 5-10 percent of toughener, 0.1-1 percent of antioxidant and 0.3-0.8 percent of lubricating agent. The phenolic resin is thermoplastic linear phenolic resin. The preparation method comprises the following steps of: (1) weighing up the polyethylene, the phenolic resin, the curing agent, the compatilizer, the toughener, the antioxidant and the lubricating agent according to the proportion, adding the mixture in a high-speed stirrer and stirring for 5 minutes; and (2) adding the prepared material in a double-screw extruder and extruding ...

Nano imvite talcum powder rotantional moulding-gradecross-linked polyethylene composite material and preparation method thereof

The invention relates to a cross-linked polyethylene composite material and a preparation method thereof, in particular to a nano imvite superfine talcum powder rotantional moulding-grade cross-linked polyethylene composite material and a preparation method thereof. The nano imvite superfine talcum powder rotantional moulding-grade cross-linked polyethylene composite material consists of components A and B, wherein the component A comprises 30-70% of high-density polyenthylene, 70-30% of linear low-density polyenthylene, 0.1-1% of cross-linking agent and 0.2-1.5% of auxiliary cross-linking agent; and the component B comprises 30-70% of high-density polyenthylene, 70-30% of linear low-density polyenthylene, 5-15% of nano imvite, 5-10% of superfine talcum powder, 0.1-1.0% of dispersed lubricant, 0.2-0.5% of surface finishing agent, 0.1-1% of cross-linking agent and 0.2-1.5% of auxiliary cross-linking agent. In the invention, the used basic resin is a composite material of the high-density ...

Marbleized rotational moulding special material and preparation method thereof

Efficient plastic fuel granules and preparation method thereof

The invention relates to efficient plastic fuel granules and a preparation method thereof. The fuel is prepared from the following ingredients in parts by mass: 100 parts of waste/old plastics, 80-120 parts of wood flour, 50-70 parts of fly ash, 5-8 parts of lubricant and 2-5 parts of white oil. The method comprises the steps of crushing the waste/old plastics into chips, cleaning and baking; weighing the wood flour, the fly ash and the lubricant, and uniformly stirring in a high-speed mixer; stirring the white oil and the plastic chips in the high-speed mixer, and then, adding a powdered material in the high-speed mixer and continuing to stir; adding the uniformly stirred material in an extruder for extrusion granulation; finally, baking in a baking oven. The fuel is applied to the combustion of blast furnaces for steel smelting and iron smelting or boilers to achieve the aims of large heat quantity, low sulfur content and low smoke emission, so that oil and coal are replaced, and energy ...

Highway route accident obstacle inspection device

The invention relates to the technical field of unmanned patrol cars, in particular to a highway route accident obstacle inspection device which comprises a side plate, a driving assembly is arranged at one end of the bottom side of the side plate, a steering assembly is arranged at the other end of the bottom side of the side plate, the driving assembly comprises a first fixing plate, one side of the first fixing plate is fixedly connected with an adapter, and the adapter is fixedly connected with a second fixing plate. And one end of the adapter is rotationally connected with one side of the side plate. According to the device, through the arrangement of the steering assembly and the driving assembly, the device can be transferred to the guardrail, the rear axle is driven to drive the driving wheels to rotate, so that the device moves on the guardrail, compared with the complex situation that the device moves on the ground, fewer obstacles are moved on the guardrail, and meanwhile, the ...

DNA probe array synthesis, photoswitch array combination and manufacture thereof

A light switch array for optically piloted synthesizing of DNA probe array and detecting the hybridized DNA probe array by light stimulation is composed of silicon dice, light switch array, driver, addressing circuit, light beam pilot holes, another silicon dice and DNA array. The cavity of light switch has two parallel mirrors made of medium film. After the light switch is selectively opened, the light beam can radiate at the synthesis position on glass plate for synthesizing DNA probe. If the light beam radiates the hydridized DNA probe on glass plate, the DNA probe is stimulated to emit fluorescence, so optically detecting it.

Preparation method of Pt-C (platinum-carbon) catalyst for nitrobenzene hydrogenation

The invention discloses a preparation method of a Pt-C (platinum-carbon) catalyst for nitrobenzene hydrogenation, which is applied to a high-activity Pt-C catalyst for nitrobenzene hydrogenation reduction to generate p-aminophenol. In order to avoid the problems of chloride oil poison and the like in the preparation of a catalyst by taking chloroplatinic acid as a precursor, ethanolamine hydroxyl platinum is used as a precursor; meanwhile, sodium dodecyl benzene sulfonate is used as a protective agent to control the particle size of the Pt particles and is prepared through two-step reduction by H2 and NaBH4. The dispersity of the active component Pt particles is good, the mass percentage is 2-5%, and the particle size of the particles is less than or equal to 5nm. The catalyst prepared by the method shows perfect catalytic activity and reaction selectivity in a reaction of generating p-aminophenol through nitrobenzene hydrogenation, wherein the conversion rate is 99.09%, and the selectivity ...

Nano imvite talcum powder rotantional moulding-gradecross-linked polyethylene composite material and preparation method thereof

The invention relates to a cross-linked polyethylene composite material and a preparation method thereof, in particular to a nano imvite superfine talcum powder rotantional moulding-grade cross-linked polyethylene composite material and a preparation method thereof. The nano imvite superfine talcum powder rotantional moulding-grade cross-linked polyethylene composite material consists of components A and B, wherein the component A comprises 30-70% of high-density polyenthylene, 70-30% of linear low-density polyenthylene, 0.1-1% of cross-linking agent and 0.2-1.5% of auxiliary cross-linking agent; and the component B comprises 30-70% of high-density polyenthylene, 70-30% of linear low-density polyenthylene, 5-15% of nano imvite, 5-10% of superfine talcum powder, 0.1-1.0% of dispersed lubricant, 0.2-0.5% of surface finishing agent, 0.1-1% of cross-linking agent and 0.2-1.5% of auxiliary cross-linking agent. In the invention, the used basic resin is a composite material of the high-density ...

High-adhesiveness antifatigue polyvinyl chloride anticorrosive paint and preparation and brushing method thereof

The invention discloses a high-adhesiveness antifatigue polyvinyl chloride anticorrosive paint and a preparation and brushing method thereof. The anticorrosive paint is composed of the following raw materials in parts by mass: 100 parts of polyvinyl chloride, 5-10 parts of elastomer, 2-4 parts of stabilizer, 30-50 parts of plasticizer, 0.2-0.4 part of antioxidant and 2-5 parts of high-efficiency heat-conducting agent. The preparation and brushing method comprises the following steps: mixing the raw materials, extruding by an extruder, pulverizing the extruded granules, and finally, brushing. The base resin of the composite paint is polyvinyl chloride, and the plasticizer, elastomer and heat-conducting agent are added. Compared with the polyethylene which is commonly adopted at present, the coating material disclosed by the invention has higher binding property, excellent toughness, excellent creep resistance and higher heat resistance, and can be widely used in the fields of chemical industry ...

Preparation method of carbon-supported noble metal catalyst for resisting poisoning of sulfur-containing species

The invention relates to a preparation method of a carbon-supported noble metal catalyst for resisting poisoning of sulfur-containing species. The carbon-supported noble metal catalyst is represented as M-PtN/C, an N-transition metal salt precursor and an M-metal salt precursor, comprising the following steps: 1) mixing and stirring Pt metal salt, a transition metal salt precursor N and a small amount of other metal salt precursors M according to a certain proportion to obtain A; 2) adding A into an organic phase solvent, and adjusting the pH value to obtain B; 3) performing step-by-step control reduction on the B by adopting sectional temperature control to obtain C; 4) adding a carbon carrier into the system C, stirring and adsorbing; and 5) carrying out suction filtration on the system D to remove water, washing with deionized water, and drying to prepare the disordered carbon-supported noble metal catalyst. And 6) performing high-temperature treatment on the prepared carbon-supported ...

Multiple-frequency crystal oscillation circuit

The invention discloses a multiple-frequency crystal oscillation circuit comprising a numerical control circuit, an amplitude control circuit, an oscillating circuit and an amplifying circuit. The numerical control circuit is used for switching crystal oscillation parameters to meet the requirements of crystal oscillation with different frequencies; the amplitude control circuit is connected to the numerical control circuit and is used for limiting the voltage amplitude of two ends of a crystal; the oscillating circuit is connected to the numerical control circuit and the amplitude control circuit and is used for producing crystal oscillation; the amplifying circuit is connected to the oscillating circuit, is used for allowing the output voltage to implement full swing amplitude oscillation and has the duty ratio meeting the design requirements. The system power consumption can be reduced effectively, and the multiple-frequency crystal oscillation circuit can be reused.

Preparation method of anti-sedimentation membrane electrode slurry

The invention relates to a preparation method of anti-sedimentation membrane electrode slurry. The preparation method comprises the following steps: step 1) selecting platinum-cobalt catalyst nano powder; drying the platinum-cobalt catalyst nano-powder in a vacuum drying oven, and controlling the water content of the platinum-cobalt catalyst nano-powder to be within 3%; controlling the particle size of nano powder of the platinum-cobalt catalyst to be 2-10nm through mechanical ball milling; 2) adding an ionomer to form a suspension system; stirring-ultrasonic dispersion alternate mixing is performed to form a mixed solution 1; 3) adding a solvent; stirring to form a mixed solution 2; and 4) dropwise adding the mixed solution 1 into the mixed solution 2, and shearing and dispersing uniformly to form a platinum-cobalt catalyst suspension. The preparation method has the beneficial effects that the micro-size of catalyst particles is controlled, a proper slurry formula system is prepared and ...

Patchouli alcohol synthetase mutant and method for preparing patchouli alcohol by fermenting recombinant escherichia coli

The invention discloses a patchouli alcohol synthetase mutant and a method for preparing patchouli alcohol through fermentation of recombinant escherichia coli, and belongs to the field of bioengineering. According to the invention, pogostemon cablin alcohol synthetase is modified, and corresponding recombinant escherichia coli is constructed, so that recombinant bacteria capable of efficiently fermenting and producing pogostemon cablin alcohol and a fermentation method thereof are obtained. The recombinant strain can take cheap glucose as a substrate, pogostemon cablin alcohol with high added value is generated through fermentation, the yield of pogostemon cablin alcohol reaches 448.1 mg/L after shake flask fermentation is carried out for 96 h, the yield is 39.1 mg/g DCW, and the volume production intensity is 112 mg/L/d. In a 5L fermentation tank, the yield of the patchouli alcohol can reach 2128 mg/L, and the volume production intensity is 304 mg/L/d.