220 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.

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.

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.

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.

A packer washout assembly for removing debris from a well bore is disclosed. The packer washout assembly includes a tubing string positioned in the well bore and forming an annulus with the well bore. A packer is interposed in the tubing string and is sealable against the interior of the well bore. A packer washout sub is connected to an upper end of the packer. The packer washout sub includes a mandrel having at least one fluid flow port extending through a sidewall and a rupture disk positioned in the fluid flow port of the mandrel. The rupture disk is adapted to rupture upon the application of a predetermined pressure within the fluid passage of the mandrel so as to place the fluid passage in fluid communication with the annulus to permit fluid to pass through the fluid port from the mandrel to the annulus and thereby circulate fluid over the top of the packer so as to wash debris from the top of the packer.

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 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 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.

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.