438results about How to "Strong pressure resistance" patented technology

The invention relates ton a variable-distribution porous end mechanical sealing structure, comprising a movable ring and a stable ring which are mechanically sealed, to form an annular sealing end. One side of the sealing end is high pressure side as ascending, while another end is low pressure side as descending, at least one sealing end is disposed with porous structure in different sizes symmetry distributed on the sealed end. Compared with present screw or groove mechanical sealing structure, the invention has better pressure resistance, abrasion resistance and better dynamic pressure effect on fluid membrane, to improve the carrier ability of fluid membrane.

The invention relates to a multi-operating mode energy-saving controlled combined type thermostatic and humidistatic air conditioning unit with a thermometal compound box body structure special for nuclear power stations. The air conditioning unit comprises a control system and a box body structure, wherein a primary-efficiency filter, a medium-efficiency filter, a surface cooler, a heater, a humidifier and a blow-off device are sequentially arranged in the box body; the front side of the primary-efficiency filter is provided with a fresh air and return air mixing section, and inlets of fresh air and return air are respectively provided with a fresh air proportioning valve and a return air proportioning valve; the control system adopts a programmable logic controller (PLC) and adopts air conditioning multi-operating mode zone control to realize the energy-saving operation of the unit; the surface cooler adopts a large temperature difference cold water heat exchanging technology and can save the investment and operation expenses of a water system; and the box body adopts a double-layer compound structure and an anti-shock device to meet the special requirements on the nuclear power stations. The invention has the characteristics of high efficiency, energy saving, good tightness, strong anti-shock capacity, safety, reliability, long service life, and the like.

The invention relates to a multiple helmholtz resonator parallel cellular sandwich wood sound absorption plate, belonging to the field of sound absorption technologies. The invention solves the problems of small chamber volume ratio, narrow sound absorption frequency band and poor sound absorption effect in the traditional sound absorption panels. Technical essential is characterized in that a sandwich layer is a cellular sandwich layer; the cellular sandwich layer is formed from splicing a plurality of cylinder bodies with hexagonal cross sections; an inner cavity of each hexagonal cylinder body is a cell cavity chamber; the chamber volume ratio of the sandwich layer is larger than 90%; the area of perforation shape surrounded by contour lines of each perforation is less than a half of the hexagonal area of corresponding sandwich layer; and each small through hole on a panel is communicated with the cell cavity chamber at the corresponding position of the sandwich layer. The invention has wider sound absorption frequency band and better medium high frequency sound absorption performance, and the sanding wave tube method sound absorption coefficients respectively reach 0.8, 0.9 and 0.7 at 500Hz, 1000Hz and 2000Hz. In addition, the invention also has the characteristics of light weight, high ratio of strength to weight, good decorative effect, and the like; and wood resources can be saved, preparation process is simple, and cost is low.

The invention discloses a super-junction device. A charge flowing region comprises a super-junction structure consisting of a plurality of alternately arranged N-type columns and P-type columns; the N-type columns have two or more widths; backward voltages required for completely exhausting the N-type columns with different widths are different, so that backward voltages corresponding to capacitance minimum values of super-junction units consisting of the N-type columns with different widths are different; and the number of the widths of the N-type columns is set to be two or more, so that the backward voltages corresponding to the capacitance minimum values of the super-junction units are mutually staggered, the super-junction units with the capacitance values greater than the capacitance minimum values always exist under any backward voltage, and the integral capacitance minimum value of the super-junction structure of the charge flowing region is increased and greater than the superposition of the capacitance minimum values of the super-junction units. The invention furthermore discloses a manufacturing method for the super-junction device. According to the super-junction device and the manufacturing method, the capacitance minimum value of the super-junction structure can be increased, the strong voltage change in a switch can be reduced, electromagnetic interference performances of a circuit and a system can be improved, so that the device is easy to use.

The invention relates to a catalyst used for direct preparation of light olefin from synthetic gas, a preparation method and an application thereof. According to the invention, a parallel flow precipitation method is used to highly disperse Fe and auxiliary agents on surfaces of self-made alkaline carriers, and thus a catalyst load is low, a preparing technology is simple and a cost is lower than that of product with a same type. When the catalyst is used for direct preparation of the light olefin from the synthetic gas, a CO conversion rate can reach 75-85 % under a one-way catalytic condition of the synthetic gas, an alkene-alkane ratio can reach 4.5-6.0 in organic gas products, an alkene weight is 50-60 % and more than 98% of the liquid product is water. The catalyst is good in abrasion resistance and pressure resistance, and can be used for slurry beds and fixed beds. A reaction technology of the catalyst is that the temperature is 200-500 DEG C, a pressure is 0-5 MPa, and an air speed of the synthetic gas is 600-2400 <-1>.

The invention discloses a two-channel optical fiber method and two-channel optical fiber sensor for measuring turbidity. The method is characterized in that a detection mode adopting double light sources, four laser beams and four photo-electricity is adopted, and the double different-wavelength light sources can be alternately lightened by an optical measuring module, so that 90-degree scattered lights and transmission lights can be alternately measured; a temperature measuring module is used for collecting temperature signals of water; a signal adjusting module is used for processing collected turbidity signals and temperature signals; a data processing module is used for calculation and treatment so that turbidity values and a temperature values are generated, and the in-site collecting data are transmitted to an upper computer. The different-wavelength light sources are simultaneously measured so that the stray light impact on turbidity measurement is eliminated; the external impact on the light signals is avoided through optical fiber transmission, thus the method has the high-temperature and high-pressure resisting performances and the anti-electromagnetic interference performance; temperature compensation is performed on the measured turbidity values so as to improve the measurement precision of turbidity. In-site online detection for the turbidity values is realized by the method, thus the method is high in sensitivity, excellent in linearity, low in cost and easy to carry and install, and the method is applied to narrow detection space and occasions where detected liquid is limited in capacity.

The present invention discloses a high concentration ammonia nitrogen waste water treatment method, a biphase separation membranes and the preparation method of the same, which relates to a waste water treatment method, a biphase separation membranes and the preparation method of the same. The biphase separation membranes is formed by macromolecule polymeric material of 98~102 by mass share, titanium dioxide fiber with a length of 5~100 nm of 0.001~5 by mass share, and chemical and blended fabric of 0.01~3.5 by mass share. The preparation method of the biphase separation membranes comprises the steps of: the macromolecule polymeric material, nanometer titanium dioxide fiber and chemical and blended fabric are mixed and agitated for 0.5~8 hours at 160~240 DEG C, and then are dried to form the biphase separation membranes. The high concentration ammonia nitrogen waste water treatment method comprises the steps of: (1) the catalyst is added into the waste water which is then subjected to microwave irradiation; (2)the waste water, after microwave irradiation, is flocculating settled and filtrated, and then the pH value of the waste water is adjusted to execute the biphase separation membranes treatment so as to obtain clear water. The biphase separation membranes of the present invention can endure a pressure difference of 0.01~5 Kg / cm<2>. The preparation method of the biphase separation membranes is simple and convenient. The high concentration ammonia nitrogen waste water treatment method of the present invention has an operating method of 5~20 yuan per ton, more than 99% of the ammonia nitrogen can be removed from the waste water.

The invention discloses an in-built middle through-hole dynamic throttling element flow meter, belonging to the technical field of automatic detection of a throttling flow meter. The flow meter is characterized in that an in-built middle through-hole dynamic throttling element is adopted; the internal and external pressures of the dynamic throttling element are balanced; the measured fluid pressure is born by a flow meter pressure hull, thus, a thin wall thick dynamic throttling element can be used; the main boy of an anti-blocking mechanism is a flexible filter medium or a filter membrane with a simple structure; compared with the used pore plates of a differential pressure flow meter, the flow meter provided by the invention mainly uses a dynamic venturi tube; the venturi tube has the advantages of small flowing resistance loss, long service life, high precision, and the tube is hard to block and the like. The flow meter provided by the invention is simple in structure, easiness in manufacturing, high in performance cost ratio, less in energy consumption for measurement, thus, the flow meter can be used for measuring the flow of small pipe diameter and dirty fluid, and has a development prospect for replacing differential pressure flow meters and partial small pipe diameter ultrasonic flow meters.

The present invention discloses one kind of composite titania-alumina carrier and its preparation process and application. The composite carrier contains titania in 10-50 wt% and in anatase and / or rutile form and contains alumina in alpha-Al2O3 form. The composite carrier has acid surface and total acid amount of 0.6-8 A / g / sq cm. The preparation process includes the following steps: mixing titanium tetrachloride solution and AlCl3.6H2O crystal through stirring and diluting, mixing with sodium meta-aluminate solution to obtain aluminum titanium hydroxide precipitate, ageing, filtering, washing, drying, crushing, kneading, and roasting at 800-1200 deg.c to obtain the carrier. The composite carrier is used in selective hydrogenation and is favorable to reducing side product 'green oil' and prolonging the life of catalyst.

The invention discloses a heat exchanger with a corrugated pipe coil structure provided with an internal duct and an external duct, which comprises an inlet, an outlet, a corrugated pipe, a dome, an internal ring bushing, an external ring bushing, a fan and a bracket. When fluid media to be in heat exchange flow in the corrugated pipe in the heat exchanger from the inlet, form a turbulent flow in a pipe wall with a corrugated structure and carry out heat exchange with air in the internal duct and the external duct outside the corrugated pipe via the wall of the corrugated pipe, the fan discharges air in the internal duct and the external duct, and the fluid media are discharged from the outlet after the heat exchange performed in the corrugated pipe in a spiral way. The heat exchanger has the advantages of high heat exchanger effectiveness, simple structural technology, light weight, integration, and the like, and the fluid media in the pipe coil after the heat exchange have even temperature, thereby the heat exchanger can be used for heat exchange of air, liquid and air-liquid mixing substances. When the corrugated pipe adopts resistant materials, the heat exchanger can be used for heat exchange for corrosive liquid media.

The invention discloses a heat-resistant and wear-resistant vulcanized rare earth alloy steel as well as a preparation method and application thereof, belonging to the field of metallurgical industry. The alloy steel comprises the following components by weight percent: 0.1 to 1.0 percent of carbon, 0.2 to 0.4 percent of silicon, 0.1 to 1.5 percent of tungsten, 0.2 to 0.8 percent of manganese, 0.3 to 1.7 percent of molybdenum, 0.5 to 2.5 percent of sulfur, 0.4 to 2.0 percent of chromium, 0.1 to 0.5 percent of vanadium, 0.001 to 0.1 percent of rare earth and balance of ferrum. With the excellent properties of heat resistance, wear resistance, solid self-lubricating, etc., the heat-resistant and wear-resistant vulcanized rare earth alloy steel is suitable for producing high-temperature and wear-resistant working parts, and can be processed into sliding bearings of various shapes, bushes, shaft sleeves, wear-resistant lining boards, return boards, machine tool slideway and other products under low heavy load. The products made of the heat-resistant and wear-resistant vulcanized rare earth alloy steel can replace copper alloy products, have the advantages of pressure resistance, wear resistance and the like and can obviously prolong the service life of workpieces.

The invention discloses a method for preparing a UiO-66 composite membrane material and belongs to the technical field of composite membrane materials. By adopting the method, UiO-66 is coated with polydopamine, so that high compatibility can be achieved for MOFs (Metal organic Frameworks) and polymers. The method comprises the following steps: coating UiO-66 with polydopamine, dispersing a polydopamine coated MOF material into N,N-dimethylacetamide, carrying out ultrasonic treatment, preparing a casting membraneliquid of polyvinylidene fluoride, centrifuging and defoaming the casting membraneliquid, scraping films on a glass plate, and carrying out phase conversion in an N,N-dimethyl acetamide solution, thereby obtaining membranes. By adopting the method, an ultrafiltration flat membranematerial of polyvinylidene fluoride is prepared from UiO66, and the composite membrane material has the advantages of being high in water flux, high in pollution resistance, high pressure resistance,and the like.

The invention relates to a method for performing in-water pile foundation hole drilling by large-diameter reverse circulation roller cone drilling. The method comprises the following steps of (1) building a temporary bridge and an on-water construction platform; (2) putting a drilling machine in place; (3) installing a drill pipe; (4) setting a slurry circulation system; and (5) performing hole drilling construction. A construction platform can bear a large-size great-self-weight large-diameter reverse circulation roller cone drilling machine; the unique drill pipe is used; good anti-folding anti-twisting and pressure-bearing performance is realized; different roller cone drill bits can be replaced when different hard rock layers are met; a drill pipe pressurizing device is used, so that when the drilling is too slow, the drill pipe can be pressurized through the drill pipe pressurizing device, and the extrusion crushing and rock cutting capability is improved; the requirement on the specific gravity of the slurry is low, river water can be used for direct water supplementation; and the drill lifting is performed before the pile pouring, and the construction step of hole cleaning can be reduced.

The invention relates to a plate-and-frame filter press which comprises a support, two cross beams and a hydraulic compressing device arranged on the support, wherein a push plate, a stop plate and a plate-and-frame group are arranged between the two cross beams, one side of each plate frame is in a plane structure, another side of each plate frame is a frame convex, each plate frame has a concave structure inside, one side of each plate frame plane is provided with a plate frame extruding balance beam, a spring and a small hydraulic cylinder are arranged between each plate frame and each plate frame extruding balance beam, a hydraulic oil opening is arranged on a small hydraulic cylinder body, the hydraulic oil opening is connected with a hydraulic oil support pipe, and a hydraulic oil branch pipe on each plate frame is communicated with a hydraulic oil main pipe on each plate frame. The position except a material inlet on the surface at one side of each plate frame is provided with an automatic filter cloth cleaning device. The plate-and-frame filter press is simple in structure, each plate frame can be synchronously pushed in the process of filter-press, the plate frames can be compacted with one another, the material can not be lost, the plate-and-frame filter press is high in filter-press efficiency, the workload of the hydraulic compressing device can be effectively reduced, each plate frame can not deform or be damaged, and the plate-and-frame filter press has a function for cleaning a filter cloth on line.

The invention relates to a black ultraviolet-transmitting quartz tube which is prepared by using high purity quartz sand as basic raw materials in parts by weight, and compounding 0.5-4.0 parts by weight of colorant, wherein the colorant comprises sodium oxide (Na2O), sodium sulphate (Na2SO4), cuprous oxide (Cu2O), cobalt sesquioxide (Co2O3), manganese dioxide (MnO2), nickel oxide (NiO) and the like. The black ultraviolet-transmitting quartz tube molded by drawing through adopting a tube wall integral coloring preparation process has good uniformity and toughness, strong compression resistance and wide light absorption range. The cutoff wavelength thereof can reach 2100 nanometers, and the transmission rate is about 63 percent.

The present invention relates to a deformable oil-based drilling fluid leakage blocking agent and a preparation method thereof. The preparation method comprises: adopting orthosilicate as a silicon source, adopting concentrated ammonia water as a catalyst and adopting a silane coupling agent as a surface modifier prepare SiO2 nano-spheres, adopting the SiO2 nano-spheres as core, adding a main emulsifier, an auxiliary emulsifier, an initiator and an oil-absorbing monomer, and using emulsion polymerization to obtain the deformable oil-based drilling fluid leakage blocking agent, wherein the average particle size is 50-870 nm. According to the present invention, the rigid SiO2 nano-spheres are adopted as the core, the good pressure bearing capacity is provided, the expansion volume multiple can be up to 1.8 times after the deformable oil-based drilling fluid leakage blocking agent is in the oil for 1 h, the deformable oil-based drilling fluid leakage blocking agent can be suitable for different sizes and shapes of gaps or cracks, and the sand bed experiment evaluation results show that the leakage blocking agent has a good blocking effect.

The invention discloses a low-carbon environment-friendly cellular light composite wallboard, comprising cellular paperboard inner core material, a waterproof heat-resisting adhesive layer, environment-friendly panels and a reinforced edge banding connecting and fastening strip. A cellular paperboard with a stable hexagon structure is used as the inner core material and has good sound insulation, heat-shielding performance and loading capacity. The waterproof heat-resisting adhesive layer firmly adheres an upper environment-friendly panel, a middle environment-friendly panel and a lower environment-friendly panel of the cellular paperboard inner core material together so as to form two double-board sound insulation structures, and the double-board sound insulation structures are also reliable heat insulation structures. The environment-friendly panels have the functions of sound insulation, heat insulation, antiflaming and appearance keeping and protecting and can improve the bearing capacity and durability of the cellular light composite wallboard. The reinforced edge banding connecting and fastening strip can exert sealing, moistureproof and supporting protective effects on the four sides of a single composite wallboard and also can exert connection function in wall surface combination and assembly during the installation of the composite wallboards. The prepared cellular light composite wallboard has low density and light weight and has the advantages of good sound insulating, heat insulating, waterproof, antiflamming performances and good durability. By applying the environment-friendly cellular light composite wallboard, the running time of a heating and ventilating equipment system can be reduced, thus consumption of energy source and discharge of carbon dioxide gas can be reduced, and a low-carbon environment-friendly pleasant environment is created.

The invention discloses a natural gas hydrate synthesis and mechanical testing integrated pressure chamber. The natural gas hydrate synthesis and mechanical testing integrated pressure chamber comprises a base, an upper shell, an end cover, two telescopic casing pipes and a built-in heat exchanger, wherein the upper shell and the base which is arranged at the bottom of the upper shell are fixedly connected to form a closed pressure cavity; the base and the end cover are respectively provided with an upward lug boss and a downward lug boss, a calibration sample is arranged in the pressure cavity, and a first inlet-outlet pipeline, a second inlet-outlet pipeline, a third inlet-outlet pipeline, a fourth inlet-outlet pipeline, a seventh inlet-outlet pipeline and an eighth inlet-outlet pipeline are arranged in the base; a fifth inlet-outlet pipeline and a sixth inlet-outlet pipeline are arranged in the end cover, a seventh inlet-outlet pipe and an eighth inlet-outlet pipeline are also arranged in the base, the built-in heat exchanger is fixed in the pressure cavity and connected with a constant-temperature control system, and a force transmission shaft is connected with a tri-axle instrument. A hard material is used for substituting a pressure-resisting hose in the pressure cavity so as to improve the pressure resistance of a pipeline, so that the designed pressure of the pressure chamber can be increased.

The invention discloses a high temperature high pressure reducing valve, comprising a lever, an upper valve cover, a valve stem, a valve body, a valve seat and a lower valve cover. The top of the valve body is connected with the upper valve cover. The bottom of the valve body is equipped with a lower valve cover. The upper part of the inner cavity of the valve body is a high-pressure admission chamber communicated with the inlet. The lower part of the valve body inner cavity is a low pressure steam chamber communicated with the outlet. A valve seat is arranged on the circulation channel between the high-pressure admission chamber and the low pressure steam chamber. A flap matched with the valve seat is arranged inside. The cross section of the flap is a streamlined structure. When the valve stem moves up and down, the valve seat and flap form a streamlined steam flow path. One end of the flap is connected with one end of the valve stem and the other end of the valve stem is connected with the level. The invention adopts single seat plunger and porous throttling cover two stage pressure reducing structure, reduces the valve leakage rate, increases pressure reducing amplitude and simultaneously the porous throttling cover can reduce noises.

The invention provides a waterproof-type rescue capsule for a mine. A capsule body of the waterproof-type rescue capsule for the mine is composed of a plurality of sections of capsule body basic units, a capsule head sealing end (1) and a capsule tail sealing end (5). The interior of the rescue capsule is divided into a transition capsule (12) and a survival capsule (13) by an isolation door (14), wherein the transition capsule (12) and the survival capsule (13) are mutually independent, and each capsule body basic unit is of a cylindrical structure formed by winding steel plates. The capsule head sealing end and the capsule tail sealing end are both arc-shaped sealing ends. The sections of capsule body basic units are connected by means of reverse flanges (9). Inverted T-shaped strengthening ribs (10) are welded on the inner wall of the capsule body. A heat insulating layer (11) covers the inner wall of the capsule body. In addition, an air curtain spraying device and a water draining system inside the capsule body are arranged inside the transition capsule. The waterproof-type rescue capsule for the mine is a full-prevention-type rescue capsule which can be used for the mine flooding environment and can also be used for other catastrophe environments. The rescue capsule is even in stress, strong in pressure-bearing capacity, simple in structural design and convenient to produce.

The invention discloses an IGBT device and a preparation method thereof, relates to a power semiconductor device, and provides a device structure design scheme capable of improving avalanche tolerance on the basis of not lowering other performance indexes (such as forward conduction voltage drop V<on>, switching speed, load short-circuit capacity and the like) of the IGBT. The invention provides a novel IGBT device structure and a preparation method thereof. Beneficial effects are achieved as follows: compared with the IGBT device in the prior art, the IGBT device disclosed by the invention can realize more stable breakdown characteristic, so that the avalanche tolerance of the device can be greatly improved, thereby enabling the device to the safer and more reliable in an actual high-speed high-power application.

The invention discloses a high-performance shaft-end O-shaped rubber sealing ring. The high-performance shaft-end O-shaped rubber sealing ring is prepared from the following raw materials in parts by weight: 30-45 parts of tetra-propylene fluorine rubber, 15-25 parts of acrylonitrile-butadiene rubber, 20-40 parts of polyether urethane rubber, 20-40 parts of isoprene rubber, 2-5 parts of 1,1-di-(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 0.5-1.5 parts of 1,2-polybutadiene, 1-1.8 parts of trimethylolpropane triacrylate, 45-55 parts of modified nano-montmorillonite, 20-40 parts of white carbon black, 5-15 parts of polytetrafluoroethylene fiber, 5-15 parts of carbon fiber, 5-15 parts of nano-kaolin, 5-10 parts of calcined clay, 10-20 parts of nano-calcium carbonate, 0.8-2.8 parts of isopropyl tri(dioctylpyrophosphate)titanate, 0.5-2 parts of triphenyl phosphate, 0.5-2 parts of dibutyl phthalate, 0.5-2 parts of microcrystalline wax and 1-1.8 parts of anti-aging agent.

The invention discloses a shaft end O-shaped sealing ring with an excellent bearing capability. The raw materials of the sealing ring comprise, by weight, 20-40 parts of tetrafluoroethylene-propylene rubber, 15-35 parts of methyl vinyl silicone rubber, 15-35 parts of polyether polyurethane rubber, 20-40 parts of butadiene rubber, 0.8-1.6 parts of dicumyl peroxide, 0.5-1.5 parts of 1,2-polybutadiene, 0.2-1.2 parts of zinc dimethacrylate, 55-70 parts of modified nano montmorillonite, 15-20 parts of white carbon black, 1-10 parts of polytetrafluoroethylene fibers, 10-20 parts of carbon fibers, 10-20 parts of nano-kaolin, 2-10 parts of mica powder, 5-15 parts of glass fibers, 0.5-1.8 parts of di(dioctylpyrophosphato) ethylene titanate, 0.5-1.5 parts of triphenyl phosphate, 0.5-1.5 parts of dibutyl phthalate, 0.5-1.5 parts of beeswax and 0.5-1.5 parts of antioxidant.

The utility model relates to a pressure-bearing header heat exchanger, which utilizes heating water for heat exchange to obtain hot tap water. Including: two headers, the header includes header shell, orifice plate and cover plate. Two or more tap water heat-absorbing pipes are fixedly connected between the two headers. The tap water heat-absorbing pipes are pierced with heating pipes. The heating pipes are connected. One end of the heating pipes is connected to the The heating water inlet is connected to the heating water outlet at the other end; one or more water blocking plates are arranged in one of the headers, and one or more water blocking plates are arranged in the other header. There are flanges around the water blocking plate, one side is welded on the orifice plate, and the other side is stuck or welded on the header shell. There are flanges around the cover plate, and the edges on both sides of the orifice plate are folded outwards, and the outwards folded edges on both sides of the orifice plate are welded and connected with the edge of the header shell plate. In the invention, the welded seam of the joint of the tube plate of the header shell is under pressure, the weld seam does not leak water, and the countercurrent heat exchange can also be realized.

The invention discloses a screening method for chip solid electrolyte tantalum capacitors. The method comprises the following steps: (1) connecting a capacitor to the output terminal of a digital source meter; (2) connecting an oscilloscope to the output terminal of the digital source meter; (3) carrying out constant-current charging; (4) carrying out pressure resistance screening test; and (5) carrying out pressure resistance assessment test on the capacitor having undergone pressure resistance screening test. The invention has the following beneficial effects: through pressure resistance screening test, capacitors with good pressure resistance can be picked out and capacitors with poor pressure resistance can be eliminated without damage to the capacitors, so it is ensured that capacitors consigned to users have best pressure resistance and usage reliability of the capacitors is improved; through pressure resistance assessment test, batch pressure resistance of capacitors can be assessed, so it is ensured that batches of capacitors with undesirable pressure resistance are not consigned to users for usage; and the method has the characteristics of simple testing, convenient operation, convenience, easy practicability and obvious effects.

The invention relates to the field of semiconductor devices, and provides a normally-off HEMT device with a longitudinal grid structure and a manufacturing method thereof. The HEMT device comprises a substrate, a buffer layer, an i-GaN layer, a grid dielectric layer and a passivation layer arranged in an overlapped mode, a source electrode coated between the ladder-shaped lower layer and the grid dielectric layer, a barrier layer and a drain electrode coated between the ladder-shaped upper layer and the grid dielectric layer, a grid electrode coated between the grid dielectric layer and the passivation layer, a source electrode pad passing through the passivation layer and the grid dielectric layer sequentially to contact with the source electrode, and a drain electrode pad passing through the passivation layer and the grid dielectric layer sequentially to contact with the drain electrode, wherein one end of the i-GaN layer and one side deviating from the buffer layer is ladder-shaped; the grid electrode has a Z-shaped section, the upper level of the grid electrode is located above the ladder-shaped upper layer, and the lower level is located above the ladder-shaped lower layer. The length of a grid electrode opening channel can be reduced, the grid on-state resistance of the device is reduced, and normally-off operation is realized.

The invention belongs to the field of vibration control, and in particular, relates to a tensile vibration isolation device. The tensile vibration isolation device comprises a substrate and an elastic support element; and the elastic support element includes a metal compression spring. The tensile vibration isolation device further comprises a reverse pressing elastic element, a reverse pressing plate and a connecting piece; a middle force bearing plate and an outer connecting plate are arranged in the connecting piece; a connecting rod or a shell is arranged on the substrate; the bottom end of the connecting rod or the shell is fixedly connected with the substrate; the reverse pressing plate and a limiting piece thereof are arranged at the top of the connecting rod, or the reverse pressing plate is fixed at the top of the shell; the reverse pressing elastic element is positioned between the reverse pressing plate and the middle force bearing plate; and the support elastic element is positioned between the middle force bearing plate and the substrate. The tensile vibration isolation device is simple in structure, can bear both downward pressure and upward tensile force, is high in vibration isolation efficiency, is stable and reliable in performance, can be widely applied to elastic vibration isolation foundation engineering in various ship power, industrial rotating equipment or rail transit vehicle operations, and is broad in market prospect.

A bio-electrochemical system, as well as an on-line monitoring device and an on-line monitoring method for biochemical oxygen demand (BOD) thereof. The invention belongs to the technical field of water body monitoring and solves a problem by providing a device and a method, which can achieve sensitive, quick, low-cost and accurate monitoring to BOD in a water body. The bio-electrochemical system can be a M3C sensor, a MFC sensor or a MEC sensor; the M3C sensor includes granular filler, a shell and a tri-electrode system, wherein the shell is in a sealed structure with a chamber therein and is provided with a sample inlet and a sample outlet that are communicated with the chamber; the granular filler is packed in the chamber in the shell and work electrodes are arranged in same; for the MFC sensor or the MEC sensor, granular filler is packed in a bio-anode chamber and / or a bio-cathode chamber. In the bio-electrochemical system, the reactor is filled with granules, so that fluid shear force is high and degradation of a substrate is more complete; therefore, detection sensitivity is higher.

The invention discloses a push-pull type fluid connector. A first deflector hole is formed in a housing of a plug; the first deflection hole consists of a first step hole, a second step hole and a third step hole; a ring-shaped supporting sheet is arranged on the rear part of the second step hole; a first valve element is arranged on the rear part of the second step hole; a first return spring is placed between the ring-shaped supporting sheet and the first valve element; a plurality of clamping blocks are arranged on the housing; a ring slot is formed in the side wall of a valve body of a socket; a second deflector hole is formed in the valve body; the second deflector hole consists of a fourth step hole, a fifth step hole and a sixth step hole; a deflector column is arranged in the second deflector hole; an outer convex ring is extended at the rear end of the deflector column; a second valve element is connected with the front end of the deflector column; a second return spring is arranged between the fourth step hole and the second valve element; a first connecting sleeve is arranged at the outer side of the rear part of the housing in a sleeving mode; and a second connecting sleeve is arranged at the outer side of the valve body in the sleeving mode. The push-pull type fluid connector has characteristics of quick separation, reliable connection, good sealing performance, high pressure-resistant capacity and the like.

The invention belongs to the technical field of semiconductors, and relates to a diode chip, in particular to a semiconductor diode chip and a manufacturing method thereof. The semiconductor diode chip comprises a silicon chip substrate, wherein the bottom part of the silicon chip substrate is provided with a phosphorus diffusion layer, the upper part is provided with a boron diffusion layer, metal electrodes are arranged on the upper part of the boron diffusion layer and the bottom part of the phosphorus diffusion layer, a novel passivation layer is arranged at the outer side of the peripheryof the silicon chip substrate, and the novel passivation layer comprises a transition portion and a 'beak' portion. The manufacturing method comprises the steps of original sheet cleaning, diffusion,sand blasting, cleaning, primary photoetching, stepped corrosion, secondary photoetching, grooving corrosion, cleaning, passivation, third-time photoetching, metallization, electrical performance testing and scribing. The semiconductor diode chip has the advantages that the 'beak' portion of the semiconductor diode chip is protected by glass, the glass is not higher than the table board of the chip, ignition is not caused, the manufacturing cost is low (higher than that of a knife scraping manufacturing process, and lower than that of a photoresist manufacturing process), the effective use area of the chip is large, the VF is lower, the glass is thick, the pressure endurance capability is high, the service life is long, the high temperature reliability is high and the like.