313results about How to "Small discrete" patented technology

The invention discloses a testing device for observing shear deformation failure characteristics between a tubular pile and a grouting soil body. The testing device comprises a fixing platform, a tubular pile model testing box, a loading mechanism and a monitoring system, wherein the fixing platform comprises a base plate, a top plate and a plurality of connecting screw rods; the tubular pile model testing box comprises a bottom wall, two side walls, a rear wall and a front wall, wherein the front wall is movably arranged between the side walls, and is made of colorless transparent organic glass; the monitoring system comprises a displacement sensor, a pressure sensor and a strain rosette group arranged on the outer surface of the tubular pile; the strain rosette group comprises a plurality of strain rosettes which are uniformly distributed along the central axis direction of the tubular pile, and are connected with an automatic recorder. According to the invention, a semi-circular pipe pile is adopted, so that the shear deformation failure characteristics between the tubular pile and the grouting soil body can be observed conveniently, and the shear resistant intensity between the tubular pile and the grouting soil body can be observed; a camera device is adopted for recording the video of the testing process; the visual testing enables the analysis to be relatively intuitive.

The invention relates to a light-weight, high temperature-resistance and heat-insulation ceramic fiber tile and a making method thereof. The heat insulation tile comprises ceramic fibers and boron oxide, wherein the ceramic fibers comprise quartz fibers, alumina fibers and yttrium oxide stabilized zirconia fibers. The making method of the light-weight, high temperature-resistance and heat-insulation ceramic fiber tile comprises the following steps: preparing a sintering aid suspension, preparing a ceramic fiber slurry, carrying out wet green body molding, drying the obtained wet green body, and carrying out pressurization sintering. The heat insulation tile has good heat insulation effect and mechanical performances, has light weight and resists high temperature; the density is controllable between 0.10g/cm<3> and 0.90g/cm<3>; the lowest apparent heat conduction coefficient at room temperature reaches 0.033W/(m.K); the compressive strength at room temperature is greater than 3.0Mpa; and the long-time use temperature can reach 1350DEG C.

The present invention relates to high-pressure rotary spraying and core inserting process to form pedestal pipe. The pedestal pile consists of core pile, column and pile depestal. The cylindrical or turned frustum-shaped core pile may be prefabricated reinforced concrete pile, in-situ deposited pile or other pile in different cross section shapes. The pile pedestal below the core pile has diameter greater than that of the core pile. The column has circular, semi-circular of fan-shaped cross section. There may be several auxiliary core piles around the main solid or hollow core pile and several rings in relatively great diameter around the column. The present invention has reasonable design, compact structure, high friction resistance, and wide application in building engineering, bridge engineering, civil engineering, water engineering, etc.

Provided is a coil substrate and a surface mounting type coil element which have higher inductance and low resistance coil conductor and are manufactured with less number of processes. Magnetic cores 2 and 5 are provided face to face. A spiral coil conductor 20 is formed to the front and rear surfaces of a core structure body 1 having an external core closed at both ends and a central leg, and of an insulating plate 11 including a through hole 12 at the center thereof. Moreover, a coil substrate 10 mutually connecting the spiral coil conductors 20 at the front and rear surfaces via the front and rear contacts and an external electrode connected to the coil conductor 20 are also provided. Under the condition that the central leg is inserted into the through-hole 12, the coil substrate 10 is allocated at the internal side of the core structure body 1 and the magnetic cores 2, 5 include a gap at the central leg.

The invention discloses a simple and practical method for measuring frequency of alternating current voltage with software. The method comprises the following steps: acquiring a voltage value with a sampling time interval, carrying out discrete Fourier transform on the acquired voltage value, calculating a phase real part and a phase imaginary part of voltage, taking a product of the phase real part and the phase imaginary part as an input value of an interpolation fitting method, searching same direction zero crossing of the product of the phase real part and the phase imaginary part, and calculating frequency of the product of the phase real part and the phase imaginary part according to the zero crossing, wherein the frequency is the frequency of the alternating current voltage. According to the method, a filtering function of the discrete Fourier transform is fully utilized, influence of harmonic wave and direct current component on frequency measurement is eliminated, anti-interference capability is strong, a calculated value has high precision and small discrete, measurement precision is high, the method is simple and practical, high precision can be achieved both in stable state and transient state processes of a power system, realization of frequency measurement in a protection apparatus with a DSP as a core CPU is facilitated, and a requirement of the power system automatic field is satisfied.

The invention discloses an image definition detection method. The image definition detection method comprises the following steps: acquiring image data, wherein the image data are output by a camera module according to a preset exposure gain parameter; acquiring gray values of the image data according to image data formats of the image data; calculating a mean value and a mean square error of the acquired gray values, and acquiring a maximum gray mean value and a minimum gray mean value according to the mean value and the mean square error; and calculating image definition according to the maximum gray mean value and the minimum gray mean value in order to perform image definition detection by comparing the image definition with a preset threshold value. The invention also discloses an image definition detection device which is matched with the image definition detection method, and test equipment. Through adoption of the image definition detection method and device and the test equipment, the discreteness of the image definition can be reduced, and the consistency of the camera module is improved.

The invention relates to a measuring method of smoldering speed of cigarette paper, which comprises a, preparing a cigarette hollow paper drum sample, b, setting relative marks, c, setting fixing method, d, setting test conditions, e, calculating out the cigarette paper smoldering speed via formula. Compared with prior three test methods, the invention has the advantages that 1, the test result has good repeatability, 2, the test result has good stability, 3, the test result can actually represent product quality, 4, the test result can represent the application character of product, 5, and the method has good operability. The test result indicates that since the cigarette paper has single-layer drum structure, is suspended and horizontally arranged and smoldered, the sample is in one small space, to make smoldering line regular, obtain the test result with good repeatability and reduce dispersion as small variation factor, thereby truly representing the quality and application character of product.

The invention discloses an earthquake wave selection and adjustment method used for structural earthquake response analysis. The structural earthquake response analysis comprises the following steps: firstly, according to the spectral pattern characteristics of an earthquake dynamic response spectrum and the user-defined structural dynamic magnification factors, selecting a contrast interval of a beam bridge structure natural vibration period Tn; secondly, selecting a high-band contrast interval of the earthquake dynamic response spectrum; thirdly, respectively calculating the corresponding area ratios KN and KT in the two contrast intervals of a natural wave response spectrum curve and a target spectrum curve; fourthly, selecting qualified natural earthquake waves (0.8<=KT/KN<=1.2); setting a regulation factor to enable the response spectrum areas in the two intervals of natural earthquake waves to be close to the target spectrum area; taking response of a pier as the research target to achieve dynamic plastoelasticity analysis on bridges. Through double-parameter wave selection principle, the difficulty in selecting earthquake waves is greatly lowered, and the reliability of the vibration time interval analysis result of the bridge is guaranteed. Therefore, the earthquake wave selection and adjustment method provided by the invention is practical.

The invention relates to a preparation method of a porous silicon nitride ceramic material with a spherical pore structure. The method comprises the following steps: uniformly mixing silicon nitride powder with a mono-dispersed polymethyl methacrylate (PMMA) spherical pore forming agent to prepare a stable slurry, preparing microsphere powder (the silicon nitride powder and/ the spherical pore forming agent are uniformly dispersed in the above microspheres) with good fluidity and regular shape through a spray drying process, carrying out a direct cold isostatic pressing technology on the microsphere powder to prepare a blank with uniform density, carrying out an optimized batching technology to completely remove the pore forming agent and other organic matters, and sintering in nitrogen pressure atmosphere to obtain the complete non-crack porous silicon nitride ceramic material. The porous silicon nitride ceramic material prepared through the method has the advantages of uniform space distribution, uniform size spherical pores, high bending strength and small discreteness.

The invention discloses a deep reservoir rock core value characterization method comprising the following steps: collecting logging data of a real physics rock core; carrying out a rock core physics experiment so as to obtain simple rock mechanics parameters; using a porosity of the rock core logging data to serve as a reference, and carrying out curve fitting for the physics experiment result data; setting up a value model under a real complex state according to the standard rock mechanics parameters obtained by fitting under certain porosity, thus obtaining mechanics parameters of the rock core whose position is hard to reach in reality, and the physics experiment of the rock core is hard to conduct under the complex real three dimensional state. The method allows an random rock core, having the porosity logging data, to have the standard physics experiment, and the method has specific requirements for the real complex state and corresponding mechanics parameters of the rock core; the value experiment method has very good versatility and practicality.

The embodiment of the invention provides a curvature compensation low-temperature drift band-gap reference voltage source circuit. The curvature compensation low-temperature drift band-gap reference voltage source circuit is used for generating a reference voltage, and comprises a starting circuit, a first-order reference circuit and a high-order curvature compensation circuit; the starting circuit is used for providing starting voltage for a voltage reference source circuit so as to prevent the voltage reference source circuit from working in a zero state region, the first-order reference circuit is used for generating low-temperature coefficient reference voltage, and the high-order curvature compensation circuit is used for performing high-order temperature curvature compensation on thefirst-order reference circuit. According to the technical scheme, influence of input offset voltage and noise of an operational amplifier is effectively reduced in a multi-stage PNP superposition mode, and meanwhile, a high-order curvature compensation method is provided for the multi-stage PNP superposition band-gap reference source circuit, so that the temperature drift coefficient of the band-gap reference source is effectively reduced.

The invention discloses a lithium iron phosphate precursor and a method for preparing a rechargeable battery electrode thereof. The method comprises the following steps: using a prepared active substance LiFePO4 precursor as a basic raw material, attaching the active substance to a conductive skeleton firmly by using intermolecular forces of the active substance precursor, and then pressing and sintering the active substance precursor to obtain the electrode. The method does not need adhesive to attach the active substance to the skeleton so as to simplify production technology; the electrode prepared by the method has the advantages of little internal resistance, high reaction speed and quick electrolyte absorption; and the method has the advantages of simple process, low energy consumption, low cost and better electric conductivity of the electrode. After the electrode prepared by the method is assembled into an actual battery with a cathode which is prepared by graphite, the internal resistance of the battery is less than or equal to 20 milliohms, the primary discharge capacity can reach 582 milliamperes, and the specific capacity can reach 102.1 milliamperes; and the discharge capacity still can reach 560 milliamperes after 50 times of cycle.

The invention relates to a water-containing undisturbed shield muck baking-free building material and a preparation method thereof. The baking-free building material is prepared from the following rawmaterials in parts by weight: 1-80 parts of water-containing undisturbed shield muck, 1-30 parts of active waste residues, 0.1-5 parts of sodium hydroxide, 0.1-10 parts of sodium silicate and 1-20 parts of water. The method comprises the following steps: weighing the active waste residues, the sodium silicate, the water-containing undisturbed shield muck and the water, mixing, and crushing untilthe content of particles of 4.75 mm or above in the water-containing undisturbed shield muck does not exceed 10% to obtain a mixture I; adding the sodium hydroxide into the mixture I to obtain a mixture II; and pouring the mixture II into a mold to obtain the water-containing undisturbed shield muck baking-free building material. According to the method, intermediate dehydration and screening processes and links are omitted, and the production cost is greatly reduced. The invention also discloses the water-containing undisturbed shield muck unfired building material prepared by the method.

The present invention relates to a machine-washable pure wool shirting face fabric and its processing method. It is characterized by that it adopts Australian merino wool whose average fiber fineness is 18.5 plus or minus 0.3 micron and average staple length is greater than 85mm and makes said Australian merino wool undergo the traditional processes of water-washing, wool carding, recombing, rubbing and drawing, spinning, single yarn weaving and physically finishing so as to obtain the invented product.

Disclosed is a copper powder which has a good balance between oxidation resistance and electrical conductivity in spite of having a small grain size. Also disclosed is a copper powder for use in an electrically conductive paste, which is reduced in the variations in shape or grain size and has a low oxygen content. Further disclosed is an electrically conductive paste. In the copper powder for an electrically conductive paste, Si (silicon) is contained in the inside of each particle at a content of 0.1 to 10 atm%.

The invention relates to a p-type gallium oxide doped film, and discloses a device and a method for preparing the p-type gallium oxide doped film. A zinc dopant is adopted as an acceptor of the p-type gallium oxide doped film, and equivalent elements of oxygen are doped to regulate a valence band top structure of gallium oxide. The method comprises the steps that a zinc doped gallium oxide target is adopted as a sputtering target material; equivalent element elementary substances are accommodated in an evaporation source; a sputtering gas conveys steam of the equivalent elements to a radio frequency glow discharge zone; a primary product of an acceptor-equivalent element gallium oxide co-doped film is deposited on a substrate through radio frequency magnetron sputtering; and the primary product is subjected to thermal treatment and activation, and the p-type gallium oxide doped film is obtained. According to the method, the problem that the energy level of the acceptor is relatively far away from the valence band top is effectively solved, the self-compensation effect of oxygen vacancy is inhibited, and hole mobility is increased.

The invention discloses a manufacturing method of a cemented soil and stone mixed sample. Firstly, the geological structure characteristics, the macroscopic mechanical properties and basic physical and mechanical parameters of a cemented soil and stone mixed body are acquired; then, according to the model similarity principle, a sample and the size of aggregate of the sample are determined, corresponding aggregate is prepared and evenly mixed according to proportion; finally, the prepared rock soil sample is placed in a pre-manufactured resin mold to be maintained and formed. Compared with the prior art, the manufacturing method has the advantages that the rock and soil mixed sample with the properties (including the cementing varieties, the geological shape and size of the aggregate, grain composition and the like) according with those of an original-shape sample can be obtained through the sample manufacturing steps, and manufacturing and forming can be performed according to the size of a needed standard sample suitable for the corresponding indoor experiment. The defect that properties of an existing indoor experimental sample do not conform with those of the original-shape sample is overcome, the discreteness of an experimental result is reduced, and sample manufacturing and experiments can be repeated.

The invention provides a full automatic hydraulic building block forming machine without shock excitation, which comprises a frame, a workbench, an upper die, a lower die, a mould emptier, a feeding mechanism and a compaction mechanism. The compaction mechanism comprises a hydraulic cylinder, a hydraulic cylinder push frame, a bar chain force increasing and pressurizing mechanism. The hydraulic cylinder arranged on the frame passes through the frame; the lower end of the hydraulic cylinder is provided with the hydraulic cylinder push frame which is fixed. The lower end of the hydraulic cylinder push frame is provided with the bar chain force increasing and pressurizing mechanism. The lower end of the bar chain force increasing pressurizing mechanism is fixed with an upper templet. The invention provides a full automatic hydraulic forming machine of low power and large pressure without shock excitation, noise or a carrier for high strength bearing building blocks and interlocking building blocks.

The invention relates to a light buckling-restrained brace energy dissipation device with triple metal circular tubes, which consists of a core stressed tube, buckling-restrained tubes, pilot pins and end part connecting pieces. The core stressed tube is made of a metal material with lower yield strength and good tensility, the end part section thereof is reinforced through opening a groove in the middle part to ensure that the end part section is in a flexible stressed state in the whole stressing process and is positioned between a buckling-restrained inner tube and a buckling-restrained outer tube; the buckling-restrained tube consists of an inner restraining tube, an outer restraining tube and a filling-in board, the inner and outer restraining tubes limit the core stressed tube to flex along a radial part and provide the flexural rigidity for preventing the energy dissipation device from flexing integrally; the filling-in board is axially connected with the inner tube along a brace and has considerable flexural rigidity to limit the movement of a yield section of the core tube along a tangent direction; and the pilot pins are used for fixing the relative positions of the triple metal circular tubes.

The invention provides a gear single-tooth loading testing device with a uniform loading function. The gear single-tooth loading testing device comprises two parts including a supporting structure and a loading structure located above the supporting structure, wherein the supporting structure comprises a supporting head, an adjusting gasket, a supporting base, a positioning ring, a supporting frame, a mandrel and a shaft pressing cover; the lower end of the supporting head is fixed on the supporting base; the supporting frame is located on one side of the supporting head; a testing gear is mounted at the top of an adjustable bracket through the positioning ring, the mandrel and the shaft pressing cover; the loading structure comprises a pressing head base, a limiting sleeve, a self-adjustable pressing head and a loading round plate which are coaxial with the supporting head and are arranged in sequence from top to bottom; the pressing head base and the limiting sleeve are fixedly connected together by a connection piece; the self-adjustable pressing head is arranged in the limiting sleeve; a freely-rotatable matching relation is formed between an outer convex column surface of the upper end and the inward concave arc surfaces of the pressing head base and the limiting sleeve; and the loading round plate is fixed at the lower end of the self-adjustable pressing head by an anti-releasing screw.

The invention discloses a load and freeze-thaw cycle coupled concrete durability testing device and an evaluation method. The device comprises a concrete load and freeze-thaw cycle coupling device, aconcrete strain testing system and a freeze-thaw testing machine. The concrete load and freeze-thaw cycle coupling device is placed in the freeze-thaw testing machine for a freeze-thaw cycle couplingtest. Sample strain data is recorded at real time through the concrete strain testing system, and by testing parameters such as rate of strain change, rate of mass change, etc. of a test piece after acertain times of load and freeze-thaw cycle coupling, durability of the concrete is evaluated. According to the invention, durability of loaded concrete (member) serving in severe cold areas can be rapidly tested, and load and freeze-thaw cycle coupling effect in actual service is accurately simulated. The method is simple to operate and is scientific and effective. The invention provides technical support for durability design and material selection of large-scale engineering structures under complex service conditions such as severe cold condition, etc.

The invention discloses an operational amplifier circuit. The operational amplifier circuit comprises an operational amplifier and a chopping offset elimination circuit for eliminating an offset signal and flicker noise of the operational amplifier. The invention further discloses a reference voltage generating circuit module. The reference voltage generating circuit module comprises a reference voltage generating circuit, an operational amplifier, a chopping offset elimination circuit and a filtering circuit, wherein the reference voltage generating circuit is used for generating voltage with a zero temperature coefficient and current with a zero temperature coefficient; the operational amplifier is used for providing feedback for the reference voltage generating circuit in order that the output of the reference voltage generating circuit is stabilized at a required working point; the chopping offset elimination circuit is used for modulating the inherent offset voltage and the low-frequency flicker noise of the operational amplifier in order to modulate the influence of the offset of the operational amplifier on a reference voltage generated by the reference voltage generating circuit; and the filtering circuit is used for filtering the offset signal modulated by the offset elimination circuit and keeping a useful reference voltage signal. Through adoption of the operational amplifier circuit and the reference voltage generating circuit module, the offset and the flicker noise of the operational amplifier can be eliminated, and the accuracy is increased.

The present invention discloses a method for testing a low-temperature fatigue performance of an asphalt mixture. Before the test of the method, the heat preserving time of the hemi-spherical test piece in the temperature-controlled box is kept more than 6hours. The temperature of the inner part of the temperature-controlled box is in the range of from -20 DEG C to 20 DEG C. A loading device which is provided with an upper squeeze head and a lower squeeze head is adopted for loading the hemi-spherical test piece. The loading device is totally placed in the temperature-controlled box. The distance between the supports of the lower squeeze head is in the range from 50mm to 120mm. The evaluation index of the low-temperature fatigue test is 0.2 times of stress ratio. The loading speed to the hemi-spherical test piece is 50mm/min. The fatigue loading frequency is 10Hz. The fatigue number under state of sinusoidal wave is read out thereby checking the low-temperature fatigue performance of the asphalt mixture. The test piece which has fatigue number larger than 100 thousand is qualified in low-temperature fatigue performance. The method of the invention is simple and easy for application.

A bearing unit ( 90 ) for rotatably supporting a shaft ( 100 ) comprises a seamless holding member ( 120 ) with a gap allowing a shaft to run through and extend to the outside, a bearing ( 130 ) arranged in the inside of the holding member to rotatably support the shaft so as to make it radially revolvable, an anti-shaft-release member ( 115 ) fitted to the shaft so as to abut the bearing in order to prevent the shaft from slipping away in the thrusting direction and a space-forming member ( 113 ) arranged in the inside of the holding member so as to secure a space around the anti-shaft-release member. A bearing unit may further comprise an lubricating oil seal member and the space-forming member may be used to form a passage way for lubricating oil to prevent lubricating oil from leaking.