311results about How to "Prevent channeling" patented technology

A fully depleted semiconductor-on-insulator (FDSOI) transistor structure includes a back gate electrode having a limited thickness and aligned to a front gate electrode. The back gate electrode is formed in a first substrate by ion implantation of dopants through a first oxide cap layer. Global alignment markers are formed in the first substrate to enable alignment of the front gate electrode to the back gate electrode. The global alignment markers enable preparation of a virtually flat substrate on the first substrate so that the first substrate can be bonded to a second substrate in a reliable manner.

The invention belongs to the technical field of environmental engineering wastewater treatment, and particularly relates to multi-component oxidized micro-electrolysis filler and a preparation method thereof. The multi-component oxidized micro-electrolysis filler is mainly prepared from the following components in percentage by mass: 50-60% of iron, 20-30% of activated carbon, 12-15% of adhesive and 3-5% of catalyst through mixing, wherein iron is iron scrap or iron powder with particle size not more than 80 mesh; and activated carbon is in a powder and has particle size not more than 100 mesh. The preparation method of the multi-component oxidized micro-electrolysis filler comprises uniformly mixing iron, activated carbon, the adhesive and the catalyst according to the ratio, adding water, stirring and aging, then carrying out extrusion molding to obtain molded filler, demolding to obtain a filler blank, after naturally drying, drying, sintering in the absence of air, and cooling thefiller blank to obtain the multi-component oxidized electrolysis filler. According to the invention, the hardening, dead pool, stoppage and other practical problems existing in the use of the traditional micro-electrolysis fillers are solved.

A MOSFET device that includes a first Zener diode connected between a gate metal and a drain metal of said semiconductor power device for functioning as a gate-drain (GD) clamp diode. The GD clamp diode includes multiple back-to-back doped regions in a polysilicon layer doped with dopant ions of a first conductivity type next to a second conductivity type disposed on an insulation layer above the MOSFET device, having an avalanche voltage lower than a source/drain avalanche voltage of the MOSFET device wherein the Zener diode is insulated from a doped region of the MOSFET device for preventing a channeling effect. The MOSFET device further includes a second Zener diode connected between a gate metal and a source metal of the MOSFET device for functioning as a gate-source (GS) clamp diode, wherein the GD clamp diode includes multiple back-to-back doped regions in the polysilicon layer doped with dopant ions of a first conductivity type next to a second conductivity type disposed on the insulation layer above the MOSFET device having a lower breakdown voltage than a gate oxide rupture voltage of the MOSFET device.

The present invention discloses a continuous catalytic reforming moving bed radial reactor. Said reactor adopts a circular container with catalytic bed as reaction equipment, the reactant inlet is positioned in the upper end of said reaction equipment, and its outlet is positioned in lower end of said reaction equipment, said catalytic bed is formed from external porous wall and internal porous wall cylinder in which the catalyst is filled. Said catalyst can be continuously flowed from top to bottom by means of gravity, at the same time the reaction material can be centrifugally flowed from centre toward exterior in the reaction equipment, and can be concurrently flowed from top to bottom in the distributary channel and collecting channel. Said invention is a Z-type centrifugal radial moving bed reactor, and its structure is simple and catalyst utilization rate is high.

A closed system for continuous removal of ethanol and other compounds in an aqueous solution includes a centrifuge for removing debris for providing a filtered aqueous solution. A transfer pump and flow control valve control the flow and pressure of the filtered solution. A vacuum pump provides a negative pressure within a boil chamber. An internal heating element within the boil chamber receives the filtered solution preheated by a closed loop heater for maintaining the internal boil chamber temperature. An internal up-spray header sprays droplets of the filtered solution in the boil chamber for controlling the surface area and contact time of the droplets within the boil chamber. The heated vacuum environment within the boil chamber results in the ethanol within the sprayed droplets and a stream of centrifuge off-gas, to be extracted as a vapor and prevent recombination with the filtered solution. A condenser condenses the vapor to liquid ethanol.

The invention discloses a method for treating waste gas with a biological trickling filter tower: the waste gas is passed through the bottom of the biological trickling filter tower, treated by the biological trickling filter tower, and the treated waste gas is discharged from the top, and the biological trickling filter tower is composed of The bottom of the tower with exhaust gas inlet, the tower body, and the top of the tower equipped with exhaust gas outlet are composed. The tower body is composed of several biological treatment units stacked from bottom to top, and the biological treatment units on adjacent layers are arranged There is a liquid interlayer, and the air vents for the adjacent layers are arranged on the liquid interlayer, and each layer of biological treatment units is independently equipped with a nutrient solution spray system and a temperature control device from top to bottom. Biological packing layer and nutrient solution receiving pool; the invention increases the processing load of the unit packing; improves the plugging problem of the packing layer, avoids the occurrence of channeling phenomenon, and has uniform and sufficient gas-liquid contact; packing replacement and backwashing are more convenient; the process Economical, suitable for the purification treatment of complex volatile organic mixed pollutants.

The invention discloses a liquid immersion cooling cabinet, a system and a maintenance method for a high density server, wherein the liquid immersion cooling cabinet for the high density server is used for accommodating a first refrigerant and a fixed server which are immersed and cooled. The cabinet is provided with a cabinet liquid inlet and a cabinet liquid outlet for conveying the first refrigerant; and the cabinet further comprises a baffle plate and a backflow mechanism for separating the first refrigerant liquid level into at least two independent areas; each of the independent areas iscommunicated with a backflow liquid inlet on the backflow mechanism, and a backflow liquid outlet on the backflow mechanism is communicated with the cabinet liquid outlet. Since multiple servers areplaced in each cabinet, and the liquid level temperature of the cabinet is high when the server is working, the liquid level is divided into a plurality of independent areas by the baffle plate, and each of the independent areas is provided with the backflow mechanism to guide the hotter first refrigerant located on the liquid level to a cooling host for heat exchange, so that the liquid level channeling with high temperature is prevented, and the heat dissipation efficiency is improved.

The invention relates to a stable gas membrane used for removing, recovering, and gathering ammonia or organic amine from dosage liquor or wastewater. The gas membrane comprises a membrane shell, hollow fibrous membranes (A) and hollow fibrous membranes (B). A cavity is provided in the middle of the membrane shell. An inlet and an outlet are respectively arranged on each of the two ends of the membrane shell. The hollow fibrous membranes (A) and the hollow fibrous membranes (B) are positioned in the cavity of the membrane shell. A shell pass outlet communicating with the atmosphere is arranged on a lower end of the membrane shell. The hollow fibrous membranes (A) and the hollow fibrous membranes (B) are uniformly arranged in the membrane shell with regular spaces. Dosage liquor or wastewater containing ammonia or organic amine is delivered through the tube pass of the hollow fibrous membranes (A), and absorption liquid is delivered through the tube pass of the hollow fibrous membranes(B). With the gas membrane provided by the invention, problems of traditional gas membranes of leakage and low service life are overcome; dilution of a byproduct ammonium salt solution caused by a concomitant osmotic distillation phenomenon can be effectively inhibited; ammonium salt concentration of the byproduct ammonium salt solution can be increased from 10-20% to 20-40%; mass transfer coefficient at the acid absorption liquid side can be substantially improved; the ammonia removing efficiency is high; the ammonia removing effect is stable for a long-term; and the service life of membranesets can be improved by 3-10 times than common gas membranes.

The present invention provides one method of raising the efficiency of stripping hydrocarbon converting catalyst and its equipment. According to the present invention, catalyst particle and strippingfluid are made to counterflow through one stripper with at least two layers of stuffing. The stuffing in the stuffing layers is crossed into diamond shaped grid plate parallel to the axis of the stripper. The stripper of the present invention has high efficiency. The present invention is especially suitable for catalytic conversion process of preparing olefin, the smoke impurity content in the regenerating agent is less than 0.05 vol%, and the stripper can be reduced in volume and equipment investment obviously.

Automatic fire extinguishing equipment of a fume hood includes a cabinet having a workbench, a vent pipe, and ventilation equipment. In front of the cabinet is a window panel. Top rim of the workbench has first and second detection elements, and automatic fire extinguishing equipment mechanisms. The ventilation equipment contains a fire damper. When fire occurs at the workbench from experiments, the first detection element detects a fire signal first to issue alarming sound (or alerting flash) promptly, the ventilation equipment shutdowns, with the fire damper closed for closing the vent pipe. When the second detection element detects a smoke or high temperature signal, the window panel is closed, with the automatic fire extinguishing equipment mechanisms activated automatically to terminate flame, thereby preventing thick smoke or flame from channeling into the vent pipe to spread the fire, and preventing the fume hood from starting a cascade of fire.

A method for creating access to annular spacing during P&A operations is described. Specifically, helical coils are cut into one or more casings before the plugging material is set. The plugging material is able to exit the helical coils, forming multiple, small rock-to-rock seals.

Disclosed herein is a hollow fiber membrane for feeding a mixture into the hollow space thereof, in which the mixture to be separated is fed into the hollow space of the hollow fiber membrane and allowed to permeate through a porous membrane comprising an active layer. The hollow fiber membrane is manufactured by forming a tubular active layer having a hollow space and making a polymer fiber braid, a metal wire braid or a braid consisting of a mixture of polymer fiber with metal wire, directly on the outer surface of the tubular layer, such that the active layer can be prevented from being expanded if a high-temperature, high-pressure mixture is fed into the hollow space.

The invention discloses a manufacturing method of a hanging basket in an extraction kettle and the hanging basket. The hanging basket disclosed by the invention adopts a multi-section cylinder structure, and a distributor is arranged at the bottom of the cylinder at the lower end, so that supercritical carbon dioxide fluid which enters the hanging basket from the bottom of the cylinder at the lower end can only enter the cylinder at the lower end after passing through the distributor, and the supercritical carbon dioxide fluid entering the extraction kettle from the bottom can be prevented from entering the cylinder at the lower end in the form of columnar flow or channel flow; and meanwhile, the distributors are also arranged between the sections of the cylinder, and then the supercritical carbon dioxide fluid after passing through each section of the cylinder can only enter the next section of the cylinder after redistribution. According to the hanging basket disclosed by the invention, multiple uniform redistribution is performed on the supercritical carbon dioxide fluid in the extraction kettle, thereby preventing the supercritical carbon dioxide fluid from forming the columnar flow or the channel flow, effectively improving the flow direction of the supercritical fluid in the extraction kettle, enabling extraction material in the hanging basket to be in full contact with the supercritical fluid and greatly improving the supercritical extraction efficiency and effect.

Recovering high purity benzene from hydrocarbon feedstock containing aromatics and non-aromatics is implemented by simple and low-cost modifications to conventional extractive distillation columns (EDCs). Methyl cyclohexane (MCH) that is generated through non-selective hydrogenation of toluene in hydrodesulfurization (HDS) units is a major contaminant in benzene production. To meet MCH specifications, often times the extractive distillation (ED) process for recovering purified benzene is operated with excessive benzene loss to the overhead raffinate stream, producing a lower quality non-aromatic product. Novel techniques (1) remove operational constrictions of the HDS unit on MCH production, thus lengthening the catalyst life and (2) allow the EDC to drive essentially any amount of MCH away from the bottom benzene product without concerns with benzene loss to the overhead raffinate stream and (3) recover benzene from the overhead raffinate stream to upgrade the quality of non-aromatic product and increase the benzene product recovery.

The invention discloses composite material of microfibrillar coating activated carbon or activated carbon catalysator and preparation method. The material includes micrometer ceramics or metal micro-fiber and micrometer activated carbon or activated carbon catalysator particles, the activated carbon or activated carbon catalysator particles are coated in the three-dimensional network structure uniformly. It mixes the adhesive agent, micro-fiber, activated carbon or activated carbon catalysator particle with the mass ratio of 1:1-3.5:7-10 and right amount of water to forming uniform slurry after high-speed agitation; then prepares precursor using wet paper-making art; the precursor is adglutinated and formed under 750-1400DEG C after dried fully. The material preparation art is simple and low in cost, the void ratio is high and can be adjusted within a wide range, mechanical strength is high, flexibility is good and molding is easy; it can replaces traditional activated carbon or activated carbon catalysator fixed-bed layer, enhance mass and heat transfer, reduce pressure drop and improve contact efficiency, its application prospects are bright.

A spark plug according to the invention includes a metal shell, an insulator, a center electrode, a first ground electrode, and a second ground electrode. The metal shell has a threaded portion with an outer diameter in a range of 12 to 14 mm. The first ground electrode is aligned with the center electrode in an axial direction of the spark plug to form a first spark gap across which normal sparks are discharged in normal conditions. The second ground electrode is aligned with the center electrode in a radial direction of the spark plug to form a second spark gap across which side sparks are discharged when the insulator is fouled with carbon deposits. The spark plug has an improved structure ensuring that when the insulator is fouled with carbon deposits, side sparks are discharged without formation of channels on the insulator, thereby recovering the insulation properties of the insulator.

The invention provides an air cylinder-type jet valve, which comprises a valve seat, a valve head seat, a valve plug and a valve head. The valve seat is fixedly connected with the valve head seat, and the valve plug and the valve head can move relative to the valve head seat. The valve plug is arranged inside an air cylinder in a sliding way. The air cylinder-type jet valve also comprises a valve spud and a nozzle holder. The nozzle holder is fixedly connected with the valve seat, and then the nozzle holder and the valve seat are fixed on the front end of a jet beam. The valve seat extends inside the valve spud through the jet beam. The valve spud seat is fixed on the back end of the jet beam. The invention is opened and closed through the movement of a piston; the valve head is under the floating state to ensure that the valve head is aligned automatically and is reliably sealed when the valve head touches the valve seat. The requirement for the pressure of the air supply is reduced; even when the pressure of the oil source is high, the air supply can not be treated specially. Excluding valve spud, the entire jet valve can be taken out from the front end of the jet beam. Accordingly, the invention is overhauled conveniently and the service life of the invention is long.

The invention relates to a low-temperature early-strength corrosion-resistant cement paste system for deepwater cementing. The system consists of the following components in part by weight: 100 parts of cement, 20 to 100 parts of density regulator, 0.3 to 0.6 part of retarder, 0.1 to 5 parts of fluid loss agent, 0.1 to 3 parts of early strength agent, 0 to 0.6 part of dispersant, 5 to 30 parts of heat regulator and 60 to 120 parts of water. 100 weight parts of cement contains the following components in part by weight: 20 to 70 parts of CaO, 20 to 60 parts of Al2O3, 5 to 20 parts of SiO2, 10 to 35 parts of P2O5, 0.5 to 5 parts of Fe2O3 and 1 to 4 parts of MgO. The cement paste system has excellent low-temperature early-strength, corrosion-resistant, thickening time-adjustable and 'right angle thickening' properties, and is expected to solve the main problems of low temperature, set cement corrosion, shallow water-gas channeling and the like that the deepwater cementing faces. The system is reliable in technology and low in cost, is convenient to construct on site, and is particularly suitable for low-temperature, corrosion and shallow water-gas channeling cementing operations under deepwater conditions.

The invention comprises a method and device for cell culture analysis using microporous membranes to control fluid flow in a device. The microporous membranes are of defined porosity and surface area to effectively increase the fluidic circuit resistance and control fluid flow through the device.

The application discloses a direct memory access controller operable to control data transfer between a plurality of data source and data destination pairs comprising: at least one port operable to receive data from at least one data source and to output data to at least one data destination; and a channel operable to transfer data between said at least some of said plurality of data source and data destination pairs, said channel comprising registers operable to store data transfer control data, said data transfer control data comprising a source address of said data to be transferred, a destination address of said data to be transferred and control data, said data source address and said data destination address specifying said data source and data destination; wherein prior to a data transfer between a data source and data destination pair said direct memory access controller is operable to request data transfer control data corresponding to said data source and data destination pair from a memory and to store said data transfer control data in said channel registers; and following suspension or completion of said data transfer said direct memory access controller is operable to output modified data transfer control data to said memory, such that said channel is operable to transfer data between different data source and data destination pairs in dependence upon data transfer control data received from said memory.