105results about How to "Increase the extension length" patented technology

The invention discloses a down-hole hydraulic power pulse staged fracturing permeability-increasing device and method. The device comprises a down-hole pulse fracturing device, a controllable hydraulic packer, a continuous oil pipe, a fluid control valve and a fracturing truck. The fracturing truck is connected with the controllable hydraulic packer and the down-hole pulse fracturing device through the continuous oil pipe. The controllable hydraulic packer is connected to the back end of the down-hole pulse fracturing device. The fluid control valve is arranged at the connecting opening of the continuous oil pipe. The down-hole pulse fracturing device comprises a first cylinder body, a second cylinder body, a mandrel, a sliding sleeve, a sealing ring, a spring, a nozzle and the like. Under the condition that certain construction parameters such as pumping pressure and displacement are provided for the ground fracturing truck, large-displacement low-frequency pulse fluid is generated at the shaft bottom and is injected in, and a water hammer effect is formed. The down-hole hydraulic power pulse staged fracturing permeability-increasing device is simple in structure, durable and easy to adjust, low-frequency large-displacement pulse energy can be generated, the construction technology is simple, pulse energy can be well used for breaking rocks, net-shaped complex cracks with wide extending ranges are generated, and reservoir stratum permeability is effectively improved.

The invention provides a method of forming fractures by means of hydrofracturing assisted by alternate spraying of high- and low-temperature fluids in deep hot dry rock. The method herein includes: setting out a well network, and performing primary hydrofracturing to form main fractures; injecting a high-temperature high-pressure fluid and low-temperature water alternately into the main fractureswithin short alternate time; forming micro fractures in the rock at the surface of the main fractures under the thermodynamic action of a great temperature difference and the impact action of a jet; allowing multilevel fracturing to enable the micro fractures to further expand and form more micro fractures under the action of a low-temperature waterborne fracturing fluid and the action of high pressure; repeating until the main fractures and the micro fractures are in mutual lap joint and communication so that a fracture cluster and/or a fracture belt is formed between injection wells and production wells; injecting a sand-carrying fluid, a proppant and a displacing fluid, and closing the wells to complete fracture forming so as to construct an efficient heat exchange reservoir. The methodenables the quantity of the fractures to be significantly increased via the thermal stress action of the temperature difference, so that a fracture network is formed; heat exchange efficiency of a heat storage space is improved.

A micro oscillating element includes a frame and an oscillation section connected to the frame via a torsional joining section. The oscillation section includes a movable functional section, an arm section and a first comb-tooth electrode. The arm section extends from the functional section. The first comb-tooth electrode includes first electrode teeth extending from the arm section in a direction intersecting the arm section. The micro oscillating element further includes a second comb-tooth electrode to cooperate with the first comb-tooth electrode for causing the oscillation section to oscillate about an oscillation axis defined by the torsional joining section. The second comb-tooth electrode includes second electrode teeth extending from the frame in a direction intersecting the arm section.

A heat dissipation fan used in a frame server, includes a rotation axis and a plurality of fan blades. The rotation axis is composed of a main portion and an extension portion, and the diameter of the main portion is greater than that of the extension portion. The fan blades extend outward from the rotation axis, and are utilized to drive the wind from one side of the rotation axis to the other side of the rotation axis in a direction perpendicular to the rotation axis. As such, greatly increase the air cutting area of the fan blades. In this manner, in the server frame studded with electronic devices and having very limited heat dissipation space, the heat dissipation efficiency of the server can be raised significantly, so that the electronic devices may function normally and efficiently.

A telescopic boom (1) for a vehicle (25) or a hoist with a storage rack (6) for at least two box girders (2, 3) guided displaceably in one another in the direction of their longitudinal axes, which are mounted to pivot about a horizontal pivot axle (5) in the storage rack (6) and which can be displaced reciprocally by means of a servo-drive (19) is described. In order to create advantageous structural conditions it is proposed that the longitudinal axles of the box girders (2, 3) form an upwards arched arc of a circle (4) which runs concentrically to a common axis parallel to the pivot axis (5).

The invention relates to a method for ultrasonically testing a test specimen (6), which comprises a bore (26) extending in an axial direction (L), wherein the probe (2) is disposed inside the bore (26) and extends in the axial direction (L). The probe (2) comprises a plurality of sensor rings (81-88) disposed behind one another in the axial direction (L) and spaced apart from each other, said sensor rings extending in a plane perpendicular to the axial direction (L) and comprising a plurality of ultrasonic transducers (10) spaced apart from each other. The ultrasonic transducers (10) are disposed in a segment (30) of a particular sensor ring (81-88), which extends in the circumferential direction of the particular sensor ring (81-88) on at least a partial section of a circumference of the particular sensor ring (81-88). For the ultrasonic testing of the test specimen (6), an ultrasonic test pulse originating from the ultrasonic transducers (10) of a segment (30) of a sensor ring (81-88) is coupled into the test specimen (6). Then a plurality of echo signals (20) are received with a first and a second ultrasonic transducer (10), wherein said transducers are disposed spatially apart from each other. The echo signals (20) are caused by reflection of the coupled-in ultrasonic test pulse from one and the same defect (16) present in the test specimen (6).

A vehicle occupant safety system has at least one restraint device having at least one adjustable parameter, a vehicle seat having at least one seat sensor detecting the sitting position of a vehicle occupant, a seatbelt system having at least one belt extension sensor detecting the belt extension length, and a control unit determining from the values from the seat sensor and from the belt extension sensor whether a vehicle occupant is in a forward-leaning position. The control unit then specifies the value of the adjustable parameter of the restraint device as a function of a forward-leaning position of the vehicle occupant.

Methods of hydraulic fracturing are disclosed. One method of hydraulic fracturing which is performed on a geologic stratum includes using a nano-proppant dominantly formed of particles having an average diameter of less than 1 μm dispersed in a fracturing fluid. A material for use in hydraulic fracturing may include a fracturing fluid and a nano-proppant dominantly formed of particles having an average diameter of less than 1 μm dispersed in the fracturing fluid.

The invention relates to a laminar Ti/B4C composite material and a preparation method thereof, and belongs to the technical field of metal enhanced ceramic composite materials. The composite material is formed by alternately overlying a Ti layer and a B4C layer in sequence; Ti and B4C have different thermal expansion coefficients and elastic modulus, so that cracks deflect when the cracks are extended in the composite material, fracture energy is gradually consumed, and the fracture toughness of the composite material is easy to improve; furthermore, less Al is added, and the interface strength can be improved, so that the mechanical properties of the composite material are improved; moreover, the interface reaction extent between the Ti layer and the B4C layer is reduced by utilizing a surface contact manner of particles between the Ti layer and the B4C layer. The method provided by the invention has a simple process, is easy to operate and has a very good industrial application prospect; the prepared laminar Ti/B4C composite material has a good microscopic structure, relatively low porosity and good mechanical properties.

The invention relates to a rotary self-propelled mixing jet bit with cutting wing ribs, and the rotary self-propelled mixing jet bit is applied to well drilling of a hydraulic jet radial horizontal well. The rotary self-propelled mixing jet bit comprises a bit body, a rotary shell and a positioning nut; the rear end of the bit body is provided with a hollow variable diameter cylinder, and the front end of the bit body is provided with a central nozzle with a mixing cavity; the hollow cylinder arranged at the rear end of the bit body is provided with first-level backward nozzles, multiple forward holes are formed in a hollow cylinder arranged at the front end of the bit body, and flow guiding valves are installed in the forward holes; the central nozzle is coaxial with a flow channel of the bit body, a thread is formed on the exterior of the central nozzle, and the rotary shell is positioned through the positioning nut; forward nozzles facing laterally and forwards are arranged at the front end of the rotary shell, the outer wall of the rotary shell is provided with the spiral cutting wing ribs, hard alloy cutting teeth are fixedly arranged on the surfaces of the cutting wing ribs, and second-level backward nozzles are arranged in flow guiding grooves formed among the cutting wing ribs. According to the rotary self-propelled mixing jet bit with the cutting wing ribs, the problems that in the hydraulic jet radial horizontal well drilling process, the mechanical drilling rate is low, the well diameter is small, and well holes are irregular.

The invention discloses a method and a device of iteration channel estimation based on an asymmetrical training sequence filled block transmission system. The method comprises the following steps: S0, a signal frame comprises a frame head and a frame body, the frame head is composed of a first section training sequence and a second training sequence, the length of the second training sequence is N, and the frame body is single carrier data block or orthogonal frequency division multiplexing (OFDM) data block; S1, an initial estimation result of frame channel impulse response is obtained; S2, the second section training sequence and the first section training sequence of the current signal frame are decreased gradually, the sequence which is decreased and the estimated linear convolution of the channel are calculated, the sequence after an Nth signal of a linear convolution is used as a reconstruction item of the second section training sequence; S3, according to the reconstruction item, the second section training sequence and the circulating convolution of the channel impact response are reconstructed; S4, channel estimation is conducted by using the reconstructed circulating convolution, the estimation result of the channel impact response is updated, and postprocessing of the channel estimation is conducted; and S5, the estimation result of the channel impact response is output or the step S1 is returned.

The invention provides a method for detecting COVID-19 based on mNGS and application of the method. According to the method, a multiple genome specific reverse transcription primer group of COVID-19 is designed and prepared, so that the reverse transcription efficiency of RNA of COVID-19 is improved, the aerosol pollution problem is reduced, and meanwhile, the enrichment capacity of different variant virus nucleotide sequences is improved.

The invention discloses a safety handrail. The safety handrail comprises a handrail tube and mounting bases arranged at the left end and the right end of the handrail tube. The handrail tube comprises an inner tube and a protecting case wrapping the inner tube. Each mounting base comprises a fixing disk and a connecting tube connected with the handrail tube. Each connecting tube is provided with a protecting cover in a penetrating mode, and the protecting cover is connected with the corresponding fixing disk in a clamped mode. The two ends of the inner tube are each internally provided with a connecting column with an internal thread. Reinforcing ribs are connected between the periphery of each fixing column and the inner surface of the corresponding connecting tube. A threaded rod extending out of the corresponding connecting tube is mounted in the fixing column of the connecting tube. The extension part of each threaded rod is provided with an external thread matched with the corresponding internal thread. The inner surface of the end of the left connecting tube is provided with an annular limiting flange which is provided with at least one boss extending in the radial direction. The outer diameter of the left end of the protecting case is matched with the inner diameter of the left connecting tube. The left end of the protecting case is provided with a clamping groove matched with the corresponding boss. The outer diameter of the protecting case is equal to the outer diameter of the left connecting tube and the outer diameter of the right connecting tube.

The invention discloses a low-insert force socket connector to connect chip module and print circuit board electrically, which consists of insulating bulk and several conductive terminals in the insulating bulk, wherein the support plane and assembling plane corresponding to support plane are set on the insulating bulk with several terminal containing grooves through support plane and assembling plane; the guide groove is set on and through the terminal containing groove; the conductive terminal is placed in the terminal containing groove, which contains base part, a couple of arm part from two bending extending sides of base part, contact part with smooth arc and level welding part at the bottom of base part; the smooth arc can correct deflection in the inserting course of positive chip module pin.