221 results about "Washout" patented technology

A fluid end for use in a high-pressure, reciprocating, fluid pump assembly is provided having a bore therethrough in which a plunger reciprocates. The fluid end is provided with an insert to improve the fluid end washout life. In one embodiment, the insert is constructed of a ceramic material. In another embodiment, the insert includes an abrasive resistant coating or lining.

The invention provides a large-scale multifunctional corrosion stimulation test rack taking a test circular road as a main part, which is used for simulating the corrosion condition of high acid natural gas containing H2S, CO2 and Cl on a pipeline parent metal and a welded joint under the pipeline transmission condition. The device and the method provided by the invention can be applied to pipeline parent bodies with different pipe diameters, materials, steel grades and wall thicknesses, or a welded joint corrosion test; and test functions such as test on corrosion of the pipe section parent metal and the welded joint, sulfide stress cracking (SSC), hydrogen induced cracking (HIC), washout, corrosion inhibitor effect, welding process evaluation, corrosion monitoring method comparison, pipeline-corrosion-preventing process optimization and the like are integrated into a whole; and the test functions, such as preference of the corrosion process in the pipeline are integrated into a whole, thus reasonable material selection and safe welding quality are guaranteed, and the corrosion condition of the corresponding corrosion condition on the welded joint and the parent metal is known.

An improved protective shield for attachment to the A-arms of an ATV for preventing the intrusion of debris that may damage the suspension or CV joint. The improvements enhance the shield's ability to reduce debris build up and to be more easily cleaned by suspending the shield below the suspension members and providing washout and drainage holes.

The invention relates to a function-integration gradient composite material with polymer / porous ceramic structure and a preparation method. The invention solves the problems that single material can not meet the requirement for the performance of the material made by the application condition in an extreme environment and the multilayer composite-structure material is easily layered and has poor safety and reliability. The product of the invention is made from a polymer layer, a gradient connecting layer and a ceramic layer from the inside to the outside. The preparation method comprises the following steps that: 1. the polymer layer, the gradient connecting layer and the ceramic layer are sequentially paved and then are put into a die to be formed by compression so as to obtain the green body of the composite material; 2. the ceramic layer of the green body of the composite material is loaded with high-density heat flux and then is naturally cooled. The composite-structure material of the invention has the advantages of small weight, strong structural strength and high effective heat insulation, is suitable for being used under the extreme working conditions of high temperature, airflow washout, etc., and is safe as well as reliable. The preparation method of the invention is simple and easy to be operated, and can prepare large-scale products with a complicated shape.

There are disclosed methods and apparatus for monitoring hydraulic fracturing operations, using a distributed optical fibre sensor to detect relevant acoustic signatures, such as acoustic signatures of cement washout and of events involving a valve drive component.

The present invention provides a vent assembly suitable for use with a respiratory mask of the type used in CPAP treatment. In one embodiment the vent is made of a thin air permeable membrane. Generally, the membrane is thinner than 0.5 mm. The membrane can be made of a hydrophobic material such as polytetrafluoroethylene (PTFE). The membrane can also be fabricated from expanded PTFE. The expanded PTFE membrane is mounted on a polypropylene scrim. The pores of the membrane have a reference pore size of 10 to 15 microns. In an alternative embodiment, the vent assembly includes a vent constructed from stainless steel. In another embodiment the membrane has a superficial cross-sectional area of approximately 500 mm2. In another embodiment the vent assembly comprises a membrane attached to a vent frame, the vent assembly forming an insert which can be removeably attached to a mask fame.

The invention relates to a test device, specifically to a flowing water washout prevention test device for asphalt mixture. The invention aims to solve the problem that no test device is available for evaluating the washout effect of flowing water on asphalt mixture. In the inventive device, a pedestal is disposed at the bottom of the inner cavity of a washout barrel (1), a piston (2) is disposed on the inner cavity of the washout barrel (1), an upper cover is disposed at the top end of the washout barrel (1), a conduit (3) and an upper water pipe (4) are disposed at the side wall of the washout barrel (1), a pressure meter (5) is disposed on the upper water pipe (4), and a lower water pipe (6) is disposed in the lower part of the side wall of the washout barrel (1) and provided with a valve (9). The invention can simulate the effect of flowing water pressure arising from vehicle traveling on the asphalt concrete pavement on the asphalt pavement under different temperature conditions.

The present invention provides a vent assembly suitable for use with a respiratory mask of the type used in CPAP treatment. In one embodiment the vent is made of a thin air permeable membrane. Generally, the membrane is thinner than 0.5 mm. The membrane can be made of a hydrophobic material such as polytetrafluoroethylene (PTFE). The membrane can also be fabricated from expanded PTFE. The expanded PTFE membrane is mounted on a polypropylene scrim. The pores of the membrane have a reference pore size of 10 to 15 microns. In an alternative embodiment, the vent assembly includes a vent constructed from stainless steel. In another embodiment the membrane has a superficial cross-sectional area of approximately 500 mm2. In another embodiment the vent assembly comprises a membrane attached to a vent frame, the vent assembly forming an insert which can be removeably attached to a mask fame.

A washout vent (20) for a mask for use with a system for supplying breathable gas pressurized above atmospheric pressure to an airway of a mammal. The washout vent (20) includes a vent orifice (22) adapted for gas washout. The orifice (22) includes one or more features that contribute to noise reduction, such as a channel (26) with converging walls towards atmosphere, and / or a channel (26) having one or more walls provided with surface treatment and / or contouring, such as roughening and / or scalloped portions.

Methods for noninvasively measuring, or estimating, functional residual capacity or effective lung volume include obtaining carbon dioxide and flow measurements at or near the mouth of a subject. Such measurements are obtained during baseline breathing and during and shortly after inducement of a change in the subject's effective ventilation. The obtained measurements are evaluated to determine the amount of time required for exhaled carbon dioxide levels to return to normal—effectively an evaluation of carbon dioxide “washout” from the subject's lungs. Conversely, carbon dioxide and flow measurements may be evaluated to determine the amount of time it takes carbon dioxide to “wash in,” or reach peak levels within, the lungs of the subject following the change in the subject's effective ventilation. Apparatus for effective such methods are also disclosed.

Wireline depths are estimated using cable depth measurements and accelerometer depth measurements made over a time interval encompassing the time for which the wireline depth is being estimated. A least squares smoothing filter or a weighted least squares smoothing filter may be used. Problems caused by washouts in the borehole are also addressed.

The present invention relates to combination therapies for treating Alzheimer's disease or an amyloidosis-associated pathological condition comprising co-administering a therapeutically effective amount of a first compound, and a therapeutically effective amount of a second compound. In certain embodiments, the first compound or the second compound inhibits AB peptide polymerization; is an anti-inflammatory; improves cognitive function, mood, or social behavior; is associated with Tau or alpha-synuclein; or regulates amyloid peptide washout.

The invention discloses a road cement concrete flowing water washout tester and a use method thereof. The road cement concrete flowing water washout tester comprises a motor, a speed adjuster and a base, wherein a washout cylinder is arranged on the base; a concrete test piece is arranged at the bottom inside the washout cylinder; a washout plate component is arranged on the top of the concrete test piece; the output shaft of the motor is connected with a piston through the speed adjuster; the piston comprises a pull rod and a pressure plate connected with the pull rod; the cavity between the washout plate component and the top of the washout cylinder is divided into a cavity A and a cavity B by the pressure plate; a flowing water circulation pipeline is arranged on one side of a washout bucket; the water inlet of the flowing water circulation pipeline is communicated with the cavity B; the water outlet of the flowing water circulation pipeline is communicated with the cavity A. Due to the hollow structure, the shapes of patterns of a tire can be actually simulated, so that the washout plate has the load effect on the concrete test piece, and the load effect of the tire to a pavement structure can be simulated. The road cement concrete flowing water washout tester is simple in structure, convenient to use, and capable of simulating the washout testing on the bottom and the top of a concrete pavement plate.

The invention belongs to the technical field of operation and control of power systems, and in particular relates to a method for participating in frequency control of an isolated power grid by electrolytic load. System frequency adjustment is realized through an electrolytic aluminium load control system; the electrolytic aluminium load control system comprises a network control unit NCU, a dead zone unit, a proportional amplification unit, a WASHOUT unit and an amplitude limiting unit; the proportional amplification unit and the WASHOUT unit are connected in parallel; furthermore, one end is sequentially connected to the dead zone unit and the NCU; the other end is connected to the amplitude limiting unit; the NCU is connected to an isolated power grid system; and the amplitude limiting unit is connected with a WAMS control master station. The method specifically comprises the steps of: (1), establishing an isolated power grid system model; (2), designing the control logic of an electrolytic aluminium load controller under different power disturbance models; and (3), designing parameters of the electrolytic aluminium load controller under different power disturbance models. According to the method disclosed by the invention, the thermal energy storage characteristic of the electrolytic aluminium load is utilized; therefore, effective power adjustment of the electrolytic aluminium load is realized; and the system frequency is kept steady.

The invention relates to a method for mining coal and gas by hydraulic jet grouting washout, which comprises the following steps that a coal bed (10) is drilled to by using a large-diameter drilling machine; a coal bed gas mining well (1) capable of injecting water, discharging the water and venting is installed; well drilling cementation is performed by using a casing pipe (2); a well sealing device (9) is additionally installed; a ground water pump (5), a coal-water separating device (7), a gas mining device (8) and a fire retardant supply device (12) are installed; a jet grouting device (3) is lowered to the position of the target coal bed (10); high-pressure jet water provided by the ground water pump (5) acts on the coal bed (10) through the jet grouting device (3) to form a pressure relief space (11); the top and bottom positions of the jet grouting device (3) and the pressure of the jet water are regulated so as to control the coal bed mined range; a coal-water mixture reaches the coal-water separating device (7) through a drainage device (6); separated water enters the ground water pump (5) through the fire retardant supply device (12); the pressure relief space formed on the coal bed is washed to continuously generate coal bed gas; and the coal bed gas is conveyed to the gas mining device (8).

The invention relates to an anti-air-erosion dewatering regulating valve comprising a valve body, a valve seat, valve clacks and a valve rod. The valve seat is fixed in a valve cavity encircled by the valve body, the sealing surfaces of the valve clacks and the sealing surface of the valve seat form a main sealing pair, the valve rod drives the valve clacks straightly up and down, a orifice sleeve is fixedly arranged in a valve cavity at a medium inlet, the lower end of the orifice sleeve is abutted against the non-sealing surface of the upper end of the valve seat, the valve cavity at the medium inlet is divided into an inner portion and an outer portion by the orifice sleeve and the valve seat, multilayer sleeves are sleeved layer by layer to form the orifice sleeve, a gap is reserved between each layer of the lower portion of the orifice sleeve, a plurality of orifices are radially reserved on the sleeve wall of each sleeve layer, and external diameter surfaces of the valve clacks are slidingly matched with the inner diameter surfaces of the orifice sleeve. The anti-air-erosion dewatering regulating valve has the advantages of no erosion, small required executive force, reliable sealability, wear resistance, washout proof, simple structure, convenient mounting, long service life and the like. Erosion can be avoided under the working condition of big differential and the anti-air-erosion dewatering regulating valve can be driven by a small actuator.

The invention relates to a method for predicting the washout service life of an oil well sand control screen. The method comprises the following steps: performing sand control screen indoor washout experiment for a sand control screen used in a target oil well, and acquiring experimental data; drawing a variation curve of experimental pressure along with experimental time, finding the experimental time that the experimental pressure is reduced suddenly on the curve, testing the screen mass loss at the experimental time point, and confirming a critical point that the sand control screen is subjected to washout damage; fitting experimental data, and confirming a washout service life calculation equation of the sand control screen used in the target oil well; on the basis of the critical point that the sand control screen is subjected to washout damage, calculating the washout service life of the sand control screen under the conditions of different flow velocities of fluid and liquid sand-containing concentration, and drawing a sand control screen washout service life prediction chart; according to the oil deposit production allocation of the target oil well and the well completion sand control screen length, calculating the flow velocity on the surface of the sand control screen, confirming the concentration of a sand-carrying liquid through sand outlet simulation experiment, and checking the washout service life of the sand control screen used in the target oil well in the sand control screen washout service life prediction chart.

The invention relates to the technical field of plant cultivation substrates, in particular to a high-heat-preservation substrate for recovery of broken hill vegetation in a high elevation region. 45-50% by volume of sand loam, 35-40% by volume of highland barley straw, 3-6% by volume of organic fertilizer, 0.01-0.03% by volume of pellet agent, 0.01-0.03% by volume of polyvinyl acetate, 0.01-0.03%by volume of sodium carboxymethylcellulose, 2-4% by volume of humic acid, 2-4% by volume of liquid emulsified asphalt and 0.03-0.10% by volume of plant seeds are taken, the substrate thickness is 2-6cm, the highland barley straw particle size is 2-4 cm, the organic fertilizer is faeces of Tibetan-sheep and yaks, highland barley straw and rape stalk with the particle size smaller than 4 cm, faeces and the stalk are mixed according to the volume ratio being 1:(1-3) and then subjected to composting fermentation, the composting time is from October to April the following year, turning and ventilation are conducted semimonthly, film mulching is used for covering at night, the fermentation temperature is maintained, and the seeds comprise one or multiple of pennisetum centrasiaticum, orinus thoroldii (Stapf ex Hemsl.) bor, rrtemisia wellbyi Hemsl. et Pears. ex deasy, oxytropis sericopetala, rhododendron nivale and sabina chinensis. The substrate has the advantages of being high in heat preservation, capable of prolonging plant growth time, resistant to washout, good in water-retaining property and capable of increasing the broken hill coverage rate.

The invention provides a soil sample erosion ratio washout test device. The soil sample erosion ratio washout test device comprises a control unit, a rack, a barrel body fixed on the rack, a water flow drive unit arranged on the rack, a soil sample bearing unit arranged fixedly relative to the barrel body, a circulating filtration unit in circuit connection with the barrel body, and an image collection unit which is connected with the control unit and is arranged corresponding to the soil sample bearing unit. The soil sample erosion ratio washout test device provided by the invention can be used for soil sample erosion ratio washout tests, is applicable to soil samples with relatively large particle diameter range, is wide in application range, and can avoid randomness of naked-eye observation results; and moreover, only one injection is needed in the whole test, the water using amount of the test is small, and the cost of the test can also be reduced.

Disclosed herein is a concrete washout system for collection and removal of contaminants from a construction site. The concrete washout system includes a flexible and foldable bag having four walls, a bottom surface and a top surface with a drawstring closure. The concrete washout system also includes a frame onto which the foldable bag is placed by means of structures designed to fit onto the frame for aiding it in standing upright and in an open position. The concrete washout system also includes hoisting loops to aid in removal of the foldable bag by a crane.

The invention relates to a display and a pixel circuit thereof. The display comprises the pixel circuit and a drive circuit, wherein the drive circuit is used for providing drive voltage to the pixel circuit; the pixel circuit belongs to two data lines one gate line (2D1G) architecture and at least comprises two pixel electrodes; and the two pixel electrodes belong to the same pixel type and are adjacent to each other. The pixel circuit can effectively solve the problem of color washout of specific display frames.

The embodiment of the invention discloses a simulation flight implementation method based on virtual reality, which is applied in a flight simulation platform. The flight simulation platform comprisesa simulation cockpit, a visual system, an avionics system, a flight control system and a six-degree-of-freedom motion platform. The method comprises the steps of: collecting control signals input byan aviator through the simulation cockpit; employing a flight dynamical model to provide corresponding flight parameters, and employing an illusory 4 visual system to perform transformation of coordinates of the flight parameters to convert the obtained motion parameters to parameters in the aviator's vestibule center coordinate system; performing coordination of autokinetic effects generated by angular motion and linear motion according to a linear coordination washout algorithm; and performing calculus inverse solution of the motion parameters according to a preset six-degree-of-freedom motion system inverse solution algorithm to calculate and control electric cylinder input parameters in the motion process of the platform, obtain the elongation of the electric cylinder, generate drive signals according to the elongation to drive the six-degree-of-freedom motion platform and achieve trained analog simulation flight.