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31results about How to "Improve transport performance" patented technology
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Non-noble metal catalyst used for catalytic oxygen reduction and preparation method thereof
ActiveCN108963276AImprove conductivityCapable of single-atom dispersionFuel and secondary cellsCell electrodesOxygenCalcination
The invention relates to a non-noble metal catalyst used for catalytic oxygen reduction and a preparation method thereof. The catalyst has the general formula of Me-N-C. By means of adsorption capability and range-limited calcination of the active carbon, non-noble metal atoms, Me and N which are dispersed to the atomic scale, are adsorbed and limited in the pores in the active carbon C, so that on the basis of high-electro-conductivity of the active carbon, a high-effective oxygen reduction catalyst having single-atom-dispersing capability can be obtained. The non-noble metal catalyst is lowin metal content, can be prepared at low cost and has very large specific surface area, wherein the Me and N are distributed in interior of pores in the active carbon, in a mono-atom dipsersed manner,instead of on the surface of the active carbon, so that excellent mass transfer capability and conductivity are achieved. The catalyst has excellent oxygen reduction catalytic activity, can be applied to preparation of MEA membrane electrodes and cathode catalytic reaction process of large-scale Zn-air batteries, Al-air batteries and fuel cell stacks. The invention provides the high-effective andstable catalyst for the MEA membrane electrode.
Owner:UNIV OF SCI & TECH OF CHINA
Duplex image reading apparatus
InactiveUS7110148B2Improve accuracyLow costBeam/ray focussing/reflecting arrangementsMaterial analysis by optical meansComputer science
Owner:CANON KK
Antimonide superlattice very-long wave infrared detector with dark current suppression structure
ActiveCN110797424ALittle contributionReduce the probability of hole tunnelingSemiconductor devicesEngineeringContact layer
The invention relates to an antimonide superlattice very-long wave infrared detector with a dark current suppression structure so as to suppress a device dark current and improve photon-generated carrier transport. The detector comprises a substrate, a buffer layer arranged on the substrate in an epitaxial manner, a medium-long wave band contact layer which is called as a P region and is arrangedon the buffer layer in an epitaxial manner, a very-long wave band absorption layer which is called as a pi region and is arranged on the P region of the medium-long wave band contact layer in an epitaxial manner, a medium-long wave band barrier layer which is called as an M region and is arranged on the pi region of the very-long wave band absorption layer in an epitaxial manner, a medium-long wave band contact layer which is called as an N region and is arranged on the medium-long wave band barrier layer M region in an epitaxial manner, and a cover layer arranged on an N region of the medium-long wave band contact layer in an epitaxial manner, wherein doping modes and thickness of the superlattice structure, the absorption layer and the barrier layer of each region are adjusted and controlled so as to design an energy band structure of the infrared detector. The detector is advantaged in that the detector is based on a PpiMN structure, and a brand-new barrier structure design is provided and relates to superlattice, thickness and doping.
Owner:NANJING UNIV
Lawn mower
ActiveUS20170245429A1Improve lawn mowing performanceImprove transport performanceLawn-mowersControl modeThrottle
A control unit of a lawn mower performs switching control for switching operation between a first control mode and a second mode. In the first control mode, during rotation of an engine at a first reference rotation speed, in the case where a change amount of rotation speed of the engine per unit time has exceeded a reference speed change amount, the rotation speed is maintained at a second reference rotation speed, and an flap angle is increased. In the second control mode, during rotation of the engine at a second reference rotation speed, in the case where an opening angle of a throttle valve has fallen below a reference opening angle, the rotation speed is maintained at the first reference rotation speed, and the flap angle is decreased. The second reference rotation speed is higher than the first reference rotation speed.
Owner:HONDA MOTOR CO LTD
Liquid Crystal Display and Backframe for Liquid Crystal Display
ActiveUS20130286323A1Less volumetric weightReduce overall volume and weightTelevision system detailsMachine supportsLiquid-crystal displayEngineering
The present invention discloses a liquid crystal display and a backframe for a liquid crystal display. The backframe is configured by interlinked linkages such that the backframe can be freezed in a fully extended position in use, or be collapsible when not in use in a way that the overall dimension of the collapsible backframe is smaller than the fully extended backframe. The backframe can be switched from a fully extended position under normal use, or a collapsible position under a transportation or storage. The collapsible position occupies less volumetric weight as compared to the fully extended position so as to reduce the volumetric weight when the backframe is in transportation and storage. As a result, the performance of the transportation and storage can be therefore increased, while the cost is reduced.
Owner:SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
Superlattice very long wave infrared detector structure
PendingCN111710733ATunneling probability is smallReduce contributionSemiconductor devicesOhmic contactEngineering
A very long wave infrared detector structure based on antimonide superlattices comprises the following structures from bottom to top: a substrate, a buffer layer, a very long wave band absorption layer, a medium long wave band barrier layer, a very long wave band ohmic contact layer and a top cover layer. The buffer layer is arranged on the substrate in an epitaxial manner. The antimonide superlattice very long wave infrared detector provided by the invention has good carrier transport performance. According to the invention, homotype junctions and segmented doping are introduced, and the superlattice structure, the doping concentration and the thickness of each region are regulated and controlled to obtain the infrared detector structure with high comprehensive detection rate.
Owner:NANJING UNIV
System for cutting of reinforced concrete grouped piles through shield machine
PendingCN108005670AIncrease the strength of the cutter headImproved transport capacityTunnelsRebarShield machine
The invention provides a system for cutting of reinforced concrete grouped piles through a shield machine. The system comprises a cutting unit, a propelling unit, a residue soil treatment unit, a monitoring unit and a control unit. The cutting unit is composed of a circular cutter disc and a plurality of cutters mounted on the circular cutter disc, and used for cutting residue soil, the propellingunit is composed of a jack and a propelling pump and used for propelling the cutting unit, a residue soil improvement unit of the residue soil treatment unit improves the cut residue soil, and then the residue soil is conveyed out through a spiral conveyor. The monitoring unit transmits sedimentation monitoring data of the ground and a building to the control unit in real time so as to enable thecontrol unit to adjust the tunneling parameters of the propelling unit. According to the system for cutting of the reinforced concrete grouped piles through the shield machine, the cutter configuration scheme and form are improved, the strength of the cutter disc is reinforced, the conveying capacity of the spiral conveyor is improved, and a novel foaming agent for residue soil improvement, standard thick grout for wall back grouting for improvement of other shield machine structures are proovided so that the existing shield machine can better adapt to construction of cutting of the large-diameter reinforced concrete grouped piles, and meanwhile the safety of the cut pile bodies can be ensured.
Owner:BEIJING JIAOTONG UNIV
High-mobility co-doped tellurium zinc cadmium crystal used for nuclear radiation detection and preparation method of crystal
InactiveCN108103581AImprove transmission characteristicsHigh resistivityPolycrystalline material growthFrom frozen solutionsHigh resistanceTe element
The invention relates to a high-mobility co-doped tellurium zinc cadmium (CZT) crystal used for nuclear radiation detection and a preparation method of the crystal. Two elements are used for doping tocompensate unavoidable intrinsic defects in crystal growth and reduce residual impurities, and therefore the better semi-insulating performance and excellent charge carrier transport performance arerealized at the same time. The grown co-doped CZT crystal provided by the invention has greatly-improved electron mobility in the electrical properties, the electron mobility can reach 1340 cm<2> / Vs and is improved by about 20-58% than a crystal singly doped by In reported in a literature, and the charge carrier transport performance is greatly improved; and the grown co-doped CZT has the characteristics of semi-insulating performance (high resistance), the resistivity can be up to 10<10> order of magnitudes, the electron mobility is high, and the co-doped CZT crystal fully meets the performance requirements of a nuclear radiation detector.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Bridge crane positioning and anti-swinging control method based on on-line track planning
ActiveCN110407095AImprove transport performanceQuick positioning and swing eliminationSpecial data processing applicationsLoad-engaging elementsDynamic couplingEngineering
The invention provides a bridge crane positioning and anti-swinging method based on on-line track planning. According to traditional on-line track planning, a constructed lyapunov function is only provided with a swinging angle control amount and has no displacement feedback, and a designed controller is coupled with less anti-swinging information. According to a control algorithm provided by themethod, under the condition that the number of adjusting parameters is unchanged, the displacement feedback is increased, and more swinging angle influence factors are coupled; and off-line iterativeoptimization is not needed, the transport performance of a bridge crane is improved, on-line rapid positioning and anti-swinging are realized, and the convenience of on-line parameter adjusting and the rapidity of response are achieved. Specifically, the method has the characteristics that a smooth positioning track is taken as the basis, the dynamic coupling relation between trolley moving and load swinging is utilized, an anti-swinging link which does not influence positioning is introduced, a positioning and anti-swinging track is constructed, the off-line iteration optimization is not needed, on-line track planning of a bridge crane is realized, the requirements for accurate positioning and load anti-swinging of a trolley are taken into consideration, the setting frequency and difficulty of the parameters are reduced, and the response speed is increased.
Owner:HENAN UNIV OF SCI & TECH
Laminated silicon-rich silicon carbide thin-film solar cell and preparation method thereof
PendingCN111341858AControlling the Optical BandgapWide spectral response rangeFinal product manufacturePhotovoltaic energy generationSpectral responseElectrical battery
The invention discloses a laminated silicon-rich silicon carbide thin-film solar cell and a preparation method thereof. The solar cell sequentially comprises ITO conductive glass, a boron-doped amorphous silicon carbide film, a laminated silicon-rich silicon carbide film, a phosphorus-doped amorphous silicon carbide film and an aluminum electrode from bottom to top, wherein the laminated silicon-rich silicon carbide thin film is composed of multiple layers of silicon-rich silicon carbide thin films with different silicon-carbon ratios, and an embedded silicon quantum dot thin film absorption layer with different optical band gaps is formed through a laser crystallization technology. According to the invention, the laminated silicon-rich silicon carbide film absorption layers with differentsilicon-carbon ratios are designed, the optical band gap of each sub-layer is more effectively controlled, the spectral response range can be widened, and the light absorptivity is more effectively improved, thereby facilitating the obtaining of higher photoelectric conversion efficiency.
Owner:YANGZHOU POLYTECHNIC INST
Preparation method of Bi12SiO20-Bi2O2SiO3/rGO photocatalyst
InactiveCN112495364AEasy to separateIncrease the effective areaWater/sewage treatment by irradiationCarbon compoundsPhysical chemistryPhoto catalysis
The invention relates to a preparation method of a Bi12SiO20-Bi2O2SiO3 / rGO photocatalyst, which utilizes the high conductivity and high specific surface area of graphene oxide (rGO) to load Bi12SiO20-Bi2O2SiO3 composite powder on the graphene oxide to promote the separation of photo-induced electron-hole pairs, and the obtained product has high specific surface area, can effectively adsorb organicsolvents, is easy to recover and does not generate secondary pollution. The production process is simple, equipment is simple, and the period is short.
Owner:SHAANXI UNIV OF SCI & TECH
Flower-like multilevel structure zinc oxide support framework, and preparation method and application thereof
ActiveCN102912437AMild reaction conditionsSimple preparation processMaterial nanotechnologyPolycrystalline material growthFlower likeCrystal orientation
The invention discloses a flower-like multilevel structure zinc oxide support framework, and a preparation method and application thereof. The support framework is a multilevel structure zinc oxide material which grows on a conducting substrate material in situ. The shape of the multilevel structure zinc oxide material is a flower-like multilevel structure composed of a dendriform zinc oxide nano linear array. The dendriform zinc oxide nano linear array is a monocrystalline zinc oxide nano linear array material with a wurtzite crystalline phase structure, which grows in different growth directions accroding to the [001] crystal orientation. The support framework can be used for preparing a composite silicon-base lithium battery negative pole material; and the composite silicon-base lithium battery negative pole material is composed of the support framework, and a metal nickel layer and an amorphous silicon layer which are sequentially coated on the support framework. The flower-like multilevel structure zinc oxide support framework disclosed by the invention has large specific area and has favorable structural stability under multiplied charging / discharging working conditions. The composite silicon-base lithium battery negative pole material prepared from the flower-like multilevel structure zinc oxide support framework has favorable multiplied charging / discharging properties.
Owner:ZHEJIANG UNIV OF TECH
Roller type remnant film conveying device
ActiveCN111194583APreventing unthrowable phenomenaAvoid entanglementGatherer machinesEngineeringMechanical engineering
The invention relates to a roller type remnant film conveying device. The roller type remnant film conveying device comprises a supporting mechanism and a film conveying roller supported through the supporting mechanism, wherein the film conveying roller can rotate along a central axis of the film conveying roller and comprises a roller, a plurality of film conveying blades are uniformly distributed on an outer-circle side face of the roller along a circumferential direction, a direction of extension of each film conveying blade is parallel to an axial direction of the roller, and empty slotsare sequentially formed in the film conveying blades along the axial direction of the roller so as to enable the film conveying blades to be of serrate structures; and each film conveying blade comprises first film conveying blades and second film conveying blades which are of alternative arrangement, corresponding two second film conveying blades are arranged at the two sides of each first film conveying blade, and the first film conveying blades and the empty slots in the second film conveying blades are of alternative arrangement, so as to adapt to a structure of an eccentric pickup rollerthat openings of pickup teeth of adjacent columns are of alternative arrangement.
Owner:SHANDONG ACADEMY OF AGRICULTURAL MACHINERY SCIENCES
Compound including benzimidazole ring structure and organic electroluminescent element
PendingUS20210009584A1Increased durabilityImprove electron injection performanceOrganic chemistrySolid-state devicesCrystallographyOrganic electroluminescence
A compound including a benzimidazole ring structure, represented by general formula (1).(In formula (1), X1 and X2 may be the same or different and each represent a specific carbon atom or a nitrogen atom, Ar represents a specific group, R1 and R2 may be the same or different and each represent a specific group, and m is an integer of 0-4.)
Owner:HODOGOYA CHEMICAL CO LTD
Tapered guide cylinder
Owner:HARBIN ENG UNIV
One-way carrier photodetector and preparation method thereof
PendingCN114551617AImprove transport performanceEnhanced light absorptionFinal product manufactureSemiconductor devicesResponsivityEngineering
The invention provides a one-way carrier photodetector and a preparation method thereof. The uni-traveling carrier optical detector structure comprises an AlN substrate; the first metal bonding pad, the second metal bonding pad and the third metal bonding pad are located on the upper surface of the substrate; the first N-type electrode is positioned on the upper surface of the first metal bonding pad; the second N-type electrode is positioned on the upper surface of the third metal bonding pad; the P-type electrode is positioned on the upper surface of the second metal bonding pad; the P-type contact layer is positioned on the upper surface of the P-type electrode; the electron blocking layer is positioned on the upper surface of the P-type contact layer; the collecting layer is positioned on the upper surface of the electron blocking layer; the absorbing layer is positioned on the upper surface of the collecting layer; the N-type contact layer is positioned on the upper surfaces of the absorption layer, the first N-type electrode and the second N-type electrode; the anti-reflection layer is positioned on the upper surface of the N-type contact layer; and the absorption layer is a p-type gradient doped InGaN layer. The uni-traveling carrier photodetector has high saturation linear output and high response rate.
Owner:SOUTH CHINA UNIV OF TECH
A preparation method of fluorescent solar collector based on carbon quantum dots
ActiveCN109904270BImprove stabilityHigh Luminescence Quantum YieldNanoopticsLuminescent compositionsSolar lightMeth-
The invention discloses a preparation method of a fluorescence solar light collector based on carbon quantum dots. The preparation method is characterized by comprising the following steps: (1) preparing carbon quantum dots in different sizes through a hydrothermal decomposition method; (2) dissolving carbon quantum dots and photoinitiator into a mixed solution formed by mixing methyl propane acidglycerol trilaurate and dimethyl acrylic ethylene glycol diacrylate, ultrasonically treating the mixed solution for 3-5min, oscillating for 1-3min on a vortex mixer in a mixed way, placing in a vacuum environment to drying for 2-4h, heating for 20-40min at constant temperature of 50-70 DEG C at water bath, and then pouring the mixed solution into a self-made glass mold, exhausting air for 2-4h ina vacuum drying oven, curing by adopting a water bath heating method or the irradiation of an ultraviolet lamp, and cutting and polishing after curing and demolding. The preparation method has the advantages that the reabsorption loss can be effectively reduced, the device light collecting efficiency is greatly improved, the cost is low, the biological compatibility is good, and the light stability of the device is good.
Owner:NINGBO UNIV
Solid electrolyte and preparation method and application thereof
InactiveCN112271322AGood lithium ion transport abilityImprove conductivitySolid electrolytesSecondary cellsPhysical chemistryElectronic conductivity
The invention relates to a solid electrolyte and a preparation method and application thereof, the solid electrolyte is Li7-xPS6-xMx, wherein parameters are as shown in the description. The lithium ion conductivity of the solid electrolyte is relatively high because halogen provides a multi-dimensional channel for lithium ion transmission, the activity space of lithium ions is increased, and the lithium ion conductivity is improved.
Owner:SVOLT ENERGY TECHNOLOGY CO LTD
Photoelectrode material based on InGaN/organic heterostructure and preparation method and application thereof
PendingCN114540875AFacilitate generation and transmissionImprove photoelectric conversion efficiencyPolycrystalline material growthEnergy inputHydrogen productionOptics
The invention discloses a photoelectrode material based on an InGaN / organic heterostructure as well as a preparation method and application of the photoelectrode material. The photoelectrode material comprises a Si substrate, an InGaN nano column arranged on the Si substrate, and an organic material layer arranged on the upper surface of the InGaN nano column, and the organic material layer is a non-fullerene material layer. The organic material IT-4F is used, so that the absorption spectrum range of the photoelectrode material is widened, surface charge recombination is effectively passivated, meanwhile, dissociation and transmission of charge carriers and reduction reaction of the charge carriers on an electrode / electrolyte interface are promoted through a heterostructure formed by the organic material IT-4F and the InGaN nanorods, and the photoelectric conversion efficiency is greatly improved; therefore, hydrogen production by photoelectrochemical water decomposition without bias voltage is realized, and an effective strategy is provided for efficiently converting solar energy into hydrogen energy.
Owner:SOUTH CHINA UNIV OF TECH
A variable diameter guide cylinder
Owner:HARBIN ENG UNIV
A Antimonide Superlattice VLWIR Detector with Dark Current Suppression Structure
ActiveCN110797424BLittle contributionReduce the probability of hole tunnelingSemiconductor devicesContact layerParticle physics
A antimonide superlattice VLWIR detector with a dark current suppression structure to suppress device dark current and improve photogenerated carrier transport. Including the following structure: substrate; buffer layer, epitaxial on the substrate; middle and long wave band contact layer, called P region, epitaxial on the buffer layer; very long wave band absorbing layer, called π region, The epitaxial is above the P region of the medium and long wave band contact layer; the medium and long wave band barrier layer is called the M region, and is epitaxially above the π region of the very long wave band absorbing layer; the medium and long wave band contact layer is called the N region , epitaxial on the M region of the medium and long wave band barrier layer; the capping layer is epitaxial on the N region of the medium and long wave band contact layer; adjusting and controlling the superlattice structure of each region, the doping of the absorbing layer and the barrier layer The complex mode and thickness are used to design the energy band structure of the infrared detector device. The structure is based on the PπMN structure, and a new barrier structure design is proposed involving superlattice, thickness and doping.
Owner:NANJING UNIV
Novel simple trolley for cargo transportation
InactiveCN106809258AImprove transport performanceLow costHand carts with multiple axesHand cart accessoriesHandrailEngineering
Disclosed is a novel simple trolley for cargo transportation. The novel simple trolley is characterized by comprising a rear universal wheel, a cargo bearing plate, a bottom support plate and a forward unidirectional wheel; the bottom support plate is arranged at the front end of the cargo bearing plate, the forward unidirectional wheel is arranged on the front lower side of the cargo bearing plate, a cross beam is arranged on the upper side of the cargo bearing plate, an armrest is arranged above the cross beam, a rubber handle is arranged on the armrest, a supporting pillar is arranged on the lower side of the cross beam, a supporting rod is arranged between the supporting pillar and the cargo bearing plate, a steering disc is arranged on the lower side of the supporting pillar, the rear universal wheel is arranged on the lower side of the steering disc, an electronic scale is arranged on the supporting pillar, a display screen is arranged on the electronic scale, and an input panel is arranged on one side of the display screen. The novel simple trolley has the advantages that transport performance of the trolley is improved, manufacturing cost is lowered, the trolley can be operated in places where motor vehicles are inconvenient in use, great convenience is brought to carrying lighter items at short distances, and handling is facilitated.
Owner:邹界
Flower-like multi-level zinc oxide support framework and its preparation method and application
ActiveCN102912437BMild reaction conditionsSimple preparation processMaterial nanotechnologyPolycrystalline material growthFlower likeCrystal orientation
The invention discloses a flower-like multilevel structure zinc oxide support framework, and a preparation method and application thereof. The support framework is a multilevel structure zinc oxide material which grows on a conducting substrate material in situ. The shape of the multilevel structure zinc oxide material is a flower-like multilevel structure composed of a dendriform zinc oxide nano linear array. The dendriform zinc oxide nano linear array is a monocrystalline zinc oxide nano linear array material with a wurtzite crystalline phase structure, which grows in different growth directions accroding to the [001] crystal orientation. The support framework can be used for preparing a composite silicon-base lithium battery negative pole material; and the composite silicon-base lithium battery negative pole material is composed of the support framework, and a metal nickel layer and an amorphous silicon layer which are sequentially coated on the support framework. The flower-like multilevel structure zinc oxide support framework disclosed by the invention has large specific area and has favorable structural stability under multiplied charging / discharging working conditions. The composite silicon-base lithium battery negative pole material prepared from the flower-like multilevel structure zinc oxide support framework has favorable multiplied charging / discharging properties.
Owner:ZHEJIANG UNIV OF TECH
a high quality c 2 the se (1-x) a x crystal growth method
ActiveCN109371468BGood transport rateQuality improvementPolycrystalline material growthFrom chemically reactive gasesDopantTube furnace
The invention discloses a growth method for a high-quality Cu2Se(1-x)Ax crystal. The method comprises the following steps: (1) preparing raw materials, namely weighing a certain amount of Cu2Se powder, adding TeCl4, TeBr4 or I2 powder as a transportation agent and a doping agent, grinding and mixing uniformly by a mortar, adding the raw materials into a clean high-temperature-resistant quartz tube, and sealing by gas flames in a vacuum state for later use; (2) crystal growth, namely adding the quartz tube sealed in the step (1) into a two-temperature-zone or multi-temperature-zone tube furnace, and setting a growth temperature, thereby obtaining the Cu2Se(1-x)Ax crystal by virtue of growth in a certain cycle, wherein A is Cl, Br or I. The growth method for the Cu2Se(1-x)Ax crystal providedby the invention has the advantages of being simple in growth equipment, low in cost, high in quality of the grown crystal, large in size and the like.
Owner:NANJING UNIV
A roller type residual film conveying device
ActiveCN111194583BEffective transportPreventing unthrowable phenomenaGatherer machinesEngineeringMechanical engineering
Owner:SHANDONG ACADEMY OF AGRICULTURAL MACHINERY SCIENCES
A method for improving high-temperature friction performance of tungsten-rhenium alloy
The invention discloses a method for improving the high-temperature friction performance of tungsten-rhenium alloy. The method comprises: 1. Weigh W powder, Re powder and HfC powder respectively according to the target product tungsten-rhenium alloy, and mix them by high-energy ball milling under the protection of inert gas. Alloy powder; 2. Seal the mixed alloy powder and press it to obtain a billet, and then place it in a hydrogen furnace for sintering to obtain a sintered billet; 3. Put the sintered billet into a sheath for sealing welding, and then perform hot isostatic pressing to remove the sheath Then get tungsten-rhenium alloy. The present invention combines high-energy ball milling, cold isostatic pressing, hydrogen sintering and hot isostatic pressing to prepare tungsten-rhenium alloys, effectively removes impurities in raw materials, avoids the formation of softened phases, improves the density of tungsten-rhenium alloys, and avoids the occurrence of HfC agglomeration Porous, give full play to the multi-dimensional strengthening effect of HfC, greatly improve the strength and hardness of tungsten-rhenium alloy, thereby improving the high-temperature friction performance of tungsten-rhenium alloy, prolonging its service life, and reducing the occurrence of engineering accidents.
Owner:NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
Tunneling photodiode suitable for high-energy photon detection and preparation method thereof
PendingCN114551726AHigh detection sensitivityImprove absorption efficiencySolid-state devicesSemiconductor/solid-state device manufacturingPhoton detectionHigh energy photon
The invention discloses a tunneling photodiode suitable for high-energy photon detection and a preparation method of the tunneling photodiode, and the tunneling photodiode adopts an intrinsic perovskite crystal with very high thickness as a high-energy photon absorber to obtain relatively high photon absorption and conversion efficiency. A perovskite P-type layer and a perovskite N-type layer respectively grow at two ends of an intrinsic perovskite crystal by using a solution doping epitaxy method to form a perovskite PIN junction, and a junction region depletion layer potential barrier is used for inhibiting dark current and noise. And narrow-band-gap quantum dots are epitaxially grown in the junction region to form an energy band trap. When high-energy photons are incident, photon-generated carriers generated by the perovskite intrinsic absorber are injected into the quantum dot energy level trap, tunneling field emission occurs, and high-gain light current is obtained. Compared with a conventional high-energy photon PIN detection structure, due to the introduction of the tunneling field emission structure, high photocurrent gain can be obtained. Compared with a high-energy photon avalanche diode detection structure, since no random avalanche effect is generated, shot noise is relatively low.
Owner:SOUTHEAST UNIV
Growth method for high-quality Cu2Se(1-x)Ax crystal
ActiveCN109371468AGood transport rateQuality improvementPolycrystalline material growthFrom chemically reactive gasesTube furnaceTwo temperature
The invention discloses a growth method for a high-quality Cu2Se(1-x)Ax crystal. The method comprises the following steps: (1) preparing raw materials, namely weighing a certain amount of Cu2Se powder, adding TeCl4, TeBr4 or I2 powder as a transportation agent and a doping agent, grinding and mixing uniformly by a mortar, adding the raw materials into a clean high-temperature-resistant quartz tube, and sealing by gas flames in a vacuum state for later use; (2) crystal growth, namely adding the quartz tube sealed in the step (1) into a two-temperature-zone or multi-temperature-zone tube furnace, and setting a growth temperature, thereby obtaining the Cu2Se(1-x)Ax crystal by virtue of growth in a certain cycle, wherein A is Cl, Br or I. The growth method for the Cu2Se(1-x)Ax crystal providedby the invention has the advantages of being simple in growth equipment, low in cost, high in quality of the grown crystal, large in size and the like.
Owner:NANJING UNIV
Efficient conveying and filling proppant based on bionics and preparation method of efficient conveying and filling proppant
PendingCN114774104ARealize continuous operation of offshore fracturingReduce the cost of fracturing constructionFluid removalDrilling compositionFiberFracturing fluid
The invention discloses a bionics-based efficient conveying and filling proppant and a preparation method thereof. The bionics-based efficient conveying and filling proppant comprises enhanced fracturing fluid and a bionic dandelion proppant, wherein the mass ratio of the enhanced fracturing fluid to the bionic dandelion is (1-2): (100-400); according to 100 parts of the enhanced fracturing fluid, the enhanced fracturing fluid comprises the following components in parts by weight: 0.1-1 part of a drag reducer, 0.01-0.1 part of a cleanup additive, 0.2-0.8 part of a clay stabilizer, 0.01-0.05 part of a bactericide, 0.01-0.2 part of a nanoparticle enhancer and the balance of water, the bionic dandelion proppant comprises a modified proppant and modified fibers, wherein the mass ratio of the modified proppant to the modified fibers is (99-99.9): (0.1-1); according to the method, the fracturing fluid can be prepared by effectively utilizing the water source most suitable for the area, meanwhile, the prepared fracturing fluid can achieve efficient carrying and laying of the propping agent, the fracturing construction cost can be effectively reduced, the fracturing construction period can be effectively shortened, offshore fracturing continuous operation can be achieved, and the fracturing scale can be increased.
Owner:SOUTHWEST PETROLEUM UNIV
Non-precious metal catalyst for catalyzing oxygen reduction and preparation method thereof
ActiveCN108963276BImprove conductivityCapable of single-atom dispersionFuel and secondary cellsCell electrodesActivated carbonPtru catalyst
Owner:UNIV OF SCI & TECH OF CHINA
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