56results about How to "Avoid widening" patented technology

The invention discloses pervious concrete and a construction method thereof. The pervious concrete comprises the following raw materials in percentage by weight: 13.1-15.9% of cement, 12.7-15.6% of river sand, 59.6-66.0% of stones, 3.7-3.9% of water and 4.5-5.0% of admixtures, wherein the admixtures comprise the following raw materials in percentage by weight: 45-50% of ultrafine mineral powder, 15-20% of heavy calcium carbonate, 15-20% of gypsum powder, 3-5% of polypropylene fiber, 5-10% of a polycarboxylate water reducing agent, 4.2-8.4% of adhesive powder and 2-5% of a pigment. The pervious concrete provided by the invention has relatively high water permeability, strength and durability; after the pervious concrete is applied to a practical engineering, the pervious concrete can greatly improve the problem of poor drainage of a hardened road surface, so that the development of the pervious concrete can be promoted.

The invention relates to an adjustable coaxial double-slotting bolt type inspirator. A needle valve is also arranged between a shell and a center tube, the lower end of the center tube is provided with center tube slots, the lower end of the needle valve is provided with needle valve slots corresponding to the center tube, a passage is formed between a center rod and the inner wall of the center tube, and the center tube slots, the needle valve slots and the passage formed by the center rod and the inner wall of the center tube jointly form a center path nozzle. The invention provides the adjustable coaxial double-slotting bolt type inspirator which has the advantages that excellent mixing of a propellant is ensured, the solid boundary of jet flow is increased, and the combustion efficiency is improved.

The invention relates to a detection optical fiber based on a surface plasma resonance principle and a sensor. The surface plasma resonance detection optical fiber comprises a fiber core and air holes arranged on the axial direction of the fiber core and is characterized in that the first air hole of a solution channel for detecting is positioned in the center of the cross section of the optical fiber; the inner wall of the first air hole is plated with a metal film; a sensing material is plated on the inner surface of the metal film; N second air holes are distributed in the fiber core and at the periphery of the first air hole uniformly and respectively; N is an integer of more than 1; and the connecting line of the central points of the N air holes is shaped like a regular N-side polygon. According to the detection, mutual influence among the conventional channels of various samples is avoided, the resonance spectrum is narrow, and the signal to noise ratio is high. The sensor breaks through the limit that the refractive index detection upper limit of the conventional similar sensor is less than 1.42 and can effectively detect the chemical organic solution with high refractive index.

The invention provides an evaporated fuel processing apparatus of a motor-driven cart which can prevent the large scale of vehicle width due to an absorption tank. The motor-driven cart (1) comprises an engine (7) supported by a vehicle frame (2), a fuel tank (34) storing fuel transmitted to the engine (7), a receiving casing (9) disposed at the lower side of a seat (8) and the absorption tank (203) which is disposed at the periphery of the receiving casing (9) and absorbs the evaporated fuel from the fuel tank (34). In the motor-driven cart (1), the length direction of the absorption tank (203) tilts with respect to the width direction of a vehicle.

An object of the present invention is to provide a terminal fitting capable of preventing an end portion of a wire from becoming wider. A terminal fitting 10, 120, 210, 230 is provided with a connecting portion 11, 121, 211 to be connected with a mating terminal, a wire barrel 12, 126, 212 to be crimped into connection with an end portion of a wire 20, 110, 220, and a restricting portion 18, 152,218A, 231 arranged at a side closer to the connecting portion 11, 121, 211 than the wire barrel 12, 126, 212 and facing a placing surface of a bottom plate 16, 123, 216 where the end portion of the wire 20, 110, 220 is to be placed and capable of restricting an upward movement of the end portion of the wire 20, 110, 220. The restricting portion 18, 152, 218A, 231 is arranged between the wire barrel 12, 126, 212 and the connecting portion 11, 121, 211. Thus, an upward movement of the end portion of the wire 20, 110, 220 can be prevented.

The invention relates to an operation method for increasing a high-density multi-valued storage characteristic of a non-volatile flash memory. The operation method comprises the following steps of: (1), adjusting an initial state of a local captured type non-volatile flash storage unit to threshold voltage of minus 2V to minus 1 V at first: adjusting to the threshold voltage by adopting a bilateral belt-belt tunnelling hot hole injection (BBHH) erasing method; and then carrying out a transient FN operation so as to promote charges in a channel to be distributed uniformly; (2), repetitively carrying out the step (1) for many times, wherein the initial state is adjusted to the threshold voltage of minus 2V to minus 1 V through the bilateral BBHH and FN operation steps, and the fact that the threshold voltage in a channel region is same everywhere is finally realized; (3), taking the threshold as the multi-valued storage initial state, and carrying out a multi-valued unitary programming operation on an NOR type local captured storage unit; and (4), carrying out a -FN process for a short time at one time after achieving a programming state. The operation method disclosed by the invention is capable of increasing holding characteristic and tolerance characteristic of a storage device.

The measuring device includes beam-splitting delayer, convergent mirror, nonlinear crystal, diaphragm and spectrograph. Characters are that the said beam-splitting delayer is reflecting type beam-splitting delayer of Daman grating composed of three pieces of 1í‡2 reflecting type Daman grating and two pieces of light barrier configured in 3D. The convergent mirror is reflecting type convergent mirror. The invention solves issue of spread of ultrashort pulse caused by light beam penetrating through medium in measurement procedure of ultrashort laser pulse. Features are: simplified structure, easy of adjustment and low cost.

The invention relates to a device comprising a ring cylinder (1) and a ring piston that is concentric with said ring cylinder (2), a substantially annular pressure medium chamber (3) being formed between the ring cylinder (1) and the ring piston (2). The ring piston (2) can be moved in relation to the ring cylinder (1) when pressure is applied to the pressure medium chamber (3). The invention discloses an improved embodiment of a device of this type, said device being cost-effective to produce and resistant to fatigue. To achieve this, the invention proposes that the ring cylinder (1) consists of cast aluminium and the running surfaces (5, 6) of the cylinder are anodized.

The invention provides a stone-face-like sesame color system water permeable brick and a preparation method thereof. The stone-face-like sesame color system water permeable brick comprises a backing material and a surface material. The backing material comprises stone, Portland cement, water and a cementing material in a ratio of (400-600): (60-100): (18-24): (3-6). The surface material comprisesa sesame color material component, a cementing material, white cement, water and a curing agent in a ratio of (360-460): (2-6): (60-100): (16-24): (1-4). The sesame color system material comprises white silica and black silica in a mass ratio of (3-4): 1, and the cementing material comprises hydroxypropyl methyl cellulose, latex powder and silicon powder. All the raw material components and proportions have a coordination effect, the water permeability, strength and wear resistance of the stone-face-like sesame color system water permeable brick can be remarkably improved through matched use,meanwhile, the apparent texture is excellent, and the stone-face-like sesame color system water permeable brick can be widely applied and popularized.

The invention relates to the technical field of display, and provides a gate drive circuit and a display device. The gate drive circuit is used for driving a display panel, the display panel comprisesa display area and a wiring area located around the display area, and the gate drive circuit comprises a drive circuit and a compensation circuit. The drive circuit is arranged in a wiring area of the display panel and used for providing grid drive signals for grid lines of the display panel. The compensation circuit is arranged in a display area of the display panel and used for providing compensation signals for grid lines of the display panel. According to the gate drive circuit provided by the invention, the frame width of the display panel can be reduced on the premise of meeting the gate drive capability of the display panel.

The invention relates to a chromatographic analysis system which comprises a sample inlet, a sample introduction unit, a control unit, a chromatographic column and a detector and has the characteristic that the control unit is used for controlling the communication between the sample introduction unit and the sample inlet; a sample channel is arranged in the sample inlet; mobile phases carry a sample injected into the sample inlet to flow along the sample channel; and when the mobile phases pass through the sample channel at any moment, the mobile phases positioned on the cross section of the sample channel at the previous moment are all replaced. The invention also provides a chromatographic analysis method. The chromatographic analysis system and the chromatographic analysis method have the advantages of wide application scope, good separation, high sensitivity and the like.

The invention discloses a preparation method of activated cokes with surface functional groups with directionally distributed polarities. The invention relates to a preparation method of activated cokes, which is designed for solving the problems that in the process of preparing activated cokes by using an existing gas activation method, the damage of micropores causes the reduction of the number of alkaline functional groups, and after an activation process is completed, the number of surface polar functional groups of mesopores and macropores is extremely low. The preparation method comprises the following steps: 1, crushing and screening weak caking coal; 2, carrying out air preoxidation treatment; 3, under the condition of air isolating, heating to 700-800 DEG C, so that a carbonized material is obtained; 4, carrying out preliminary activation by taking mixed gas of water vapor and O2 as an activator; 5, carrying out in-depth activation by taking CO2 as an activator, so that an activated coke is obtained; and 6, carrying out surface oxidation treatment. According to the preparation method disclosed by the invention, the directional distribution of polarities of surface functional groups in a pore structure is realized, and the activated coke of which the surfaces of micropores are rich in alkaline surface functional groups and a moderate amount of polar functional groups are distributed on the surfaces of mesopores and macropores is prepared.

The first purpose of the invention is to provide a forging and pressing method of steel rail heel; a steel rail heel comprises a pre-forging heel and a final forging heel; the pre-forging heel comprises a first section, a second section, and a third section; the final forging heel comprises a fourth section and a fifth section; the method specifically comprises the following steps: implementing a first stage forging and pressing after heating the first section, the second section and the third section, wherein the first two sections are molded by forging and pressing, the third section is pre-deformed; and implementing a second stage forging and pressing after heating the last three sections. The provided forging and pressing method adopts a measure of molding twice, thereby being able to solve the defect that the size of the molded final forging heel is unqualified, as well as greatly reducing the molding force in the entire steel rail heel product molding process. The second purpose of the invention is to provide a three-position molding die with a simple integral structure; a second upper die section inside a pre-forging rail molding cavity and a first pre-forging insert inside a final forging molding cavity are both in detachable structures, thereby meeting different requirements to the three-position molding die in the twice forging and pressing process; the three-position molding die is convenient to be assembled, and strong in practicability.

A wavelength locking semiconductor laser system comprises: a first optical fiber coupling module to an Nth optical fiber coupling module, wherein the kth optical fiber coupling module comprises a kth energy transmission optical fiber and a plurality of kth semiconductor laser light-emitting tubes; a volume grating locking module comprising a plurality of (N+1)th semiconductor laser light-emitting tubes, a volume grating and an (N+1)th energy transmission optical fiber; an optical fiber combiner comprising a first input optical fiber to an (N + 1) th input optical fiber and an output optical fiber, wherein the kth energy transmission optical fiber is connected with the kth input optical fiber, and the (N+1) th energy transmission optical fiber is connected with the (N+1)th input optical fiber; and an partial reflection structure arranged on one side of the output end face of the output optical fiber, wherein the partial reflection structure is used as a resonance feedback structure of the plurality of semiconductor laser light-emitting tubes from the first semiconductor laser light-emitting tubes to the Nth semiconductor laser light-emitting tubes. The spectrum of the output light beam of the wavelength locking semiconductor laser system is narrowed.

The invention relates to a system and a method for measuring benzo [a] pyrene and metabolite thereof through on-line gel purification. The method comprises the following steps of purifying a preparedsample through an efficient gel column after the sample is introduced, cutting part of fraction flowing out of a component to be measured, diluting the cut fraction by using a dilution pump to reducethe solvent strength of the fraction, mixing the fraction by using a mixer, and enriching the fraction by using a solid-phase extraction column; and after the sample is enriched, eluting the enrichedcomponent from the flow direction opposite to the sample enrichment by using a mobile phase of an analysis pump through valve switching, and detecting and measuring the contents of the benzo [a] pyrene and the metabolite thereof through ultra-high performance liquid chromatography column separation and a fluorescence detector. According to the method, efficient purification and solid-phase extraction enrichment of the sample can be realized at the same time, the analysis sensitivity of the method is greatly improved, the pretreatment of the analysis sample is greatly simplified, and the contents of the benzo [a] pyrene and the metabolite thereof in the order of ng/mL in a blood and urine sample can be accurately measured. A sensitive, accurate and reliable novel method is provided for research on the correlation between smoking and health.

The invention relates to the field of concrete, and particularly discloses underwater concrete and a preparation method thereof. The underwater concrete is prepared from the following raw materials in parts by weight: cement, sand, gravels, water, a flocculating agent, a water reducing agent and modified composite fibers, the modified composite fiber is prepared by the following method: weighing basalt fiber and polyurethane fiber, and mixing to obtain composite fiber; weighing a chitosan film solution, and spraying the chitosan film solution on the surface of the composite insecticidal powder to prepare coated micro powder; placing the coating micro powder on the surface of the composite fiber, stirring and and mixing, and drying to obtain a modified composite fiber; the preparation method of the underwater concrete comprises the following steps: weighing the cement, the sand, the gravel and the water, mixing and stirring to obtain a mixture; weighing a flocculating agent, a water reducing agent, the modified composite fiber and the mixture, mixing and stirring, and curing to obtain the underwater concrete. The product has the advantage that the strength of the underwater concrete is prevented from being influenced by penetrating transverse cracks on the surface and in the concrete.

The invention relates to a dump truck container structure. The dump truck container structure includes a container body, a front plate assembly and a rear plate assembly. The container body includes abottom plate, arc plates and two vertical plates. The two vertical plates are located on the two sides of the bottom plate. The vertical plates and the bottom plate are connected to the arc plates. The front plate assembly is mounted on the front end of the container body. The rear plate assembly is mounted on the rear end of the container body. Sub-plates are arranged on the two sides of the container body. One side of each sub-plate is welded and fixed to the outer wall of the corresponding arc plate. An intersection line between each sub-plate and the corresponding arc plate is parallel toa length direction of the container body. One side, being away from the corresponding arc plate, of each sub-plate is inclined downward. A reinforcing plate is fixedly arranged on one surface, beingclose to the corresponding arc plate, of each sub-plate. THE reinforcing plates are fixed to the outer walls of the arc plates. The reinforcing plates are arranged to be multiple along the length direction of the container body. The dump truck container structure of the invention has the advantages of enhancing the strength of the container body while maintaining the height of the container body.

The invention provides a bridge type traction scar therapeutic device which reduces tension of the skin on two sides of a scar, expands the area of the skin on two sides of the scar and prevents the hypertrophic scar from being widened after drug injection or isotope treatment. The bridge type traction scar therapeutic device comprises a fixing part, a supporting part and a releasable locking buckle part, wherein the fixing part comprises a first adhesive tape and a second adhesive tape, the first adhesive tape and the second adhesive tape are arranged along the two sides of the scar, the supporting part is shaped like a fishbone and comprises a first parallel supporting tape, a second parallel supporting tape, a first vertical supporting tape and a second vertical supporting tape, the first parallel supporting tape and the second parallel supporting tape are parallel with the inner side of the first adhesive tape and the inner side of the second adhesive tape respectively, the first vertical supporting tape and the second vertical supporting tape are perpendicular to the first parallel supporting tape and the second parallel supporting tape, the supporting tape is fixedly arranged on the surface of the first adhesive tape and the surface of the second adhesive tape, and the releasable locking buckle part comprises one or more locking buckle devices which are fixed to the parallel supporting tape and the vertical supporting tape and used for connecting the first adhesive tape and the second adhesive tape. The bridge type traction scar therapeutic device achieves the purpose of treating the scar by the adoption of the mode of progressive traction.

The invention discloses a rotary air preheater sealing structure. The sealing structure is mainly composed of seal washers and seal grooves. The seal grooves are radially arranged on air preheater rotors. The corresponding seal washers are embedded into the seal grooves, and one end of each seal washer is fixed to a central cylinder of an air preheater; the other end of the seal washer is free. The bottoms of the seal washers are embedded into the seal grooves, and the minimum rational clearance is kept between the top of each seal washer and a sector plate. In operation, the seal grooves incline toward the peripheries of the rotors from the central cylinder, while only one section of the seal washers is fixed to the central cylinder, and does not incline with the central cylinder. In this way, the bottoms of the seal washers are still embedded into the seal groove for a certain depth to ensure the sealing effect; and the minimum clearance can still be kept between the top of the seal washer and the sector plate. The air leakage rate of the air preheater is ensured to be unchanged under different working conditions for a long time, and is kept at a low level. The rotary air preheater sealing structure disclosed by the invention has the advantages of rational and simple structure, little maintenance, uneasy jamming, abrasion or deformation, and wide application scope of working conditions, and is an important innovation of a rotary air preheater seal.

The invention relates to a pulse signal amplification circuit, an echo signal receiving system and a laser radar. The amplification circuit comprises a photoelectric conversion module, an amplifier module, a feedback module and a current compensation module. Bias voltage is connected to the positive input end of the amplifier module; the photoelectric conversion module is connected to the negative input end of the amplifier module through an electric connecting wire, the feedback module is connected between the electric connecting wire and the output end of the amplifier module, and the current compensation module is connected to the electric connecting wire; the photoelectric conversion module converts the optical pulse signal into a current pulse signal; the amplifier module converts the current pulse signal into a voltage pulse signal and amplifies the voltage pulse signal; the feedback module controls the gain of conversion from the current pulse signal to the voltage pulse signal; the current compensation module is switched on when the instantaneous light current in the current pulse signal exceeds the saturation threshold value of the amplifier module, and current compensation is carried out by using the input compensation current, so that the voltage of the negative input end is prevented from being lowered, the pulse width is prevented from being broadened, the pulse width is limited, and the blind area is improved.

The invention provides colored concrete and a preparation method thereof. The colored concrete is prepared from 500-650 parts of granite stone grains, 7-10 parts of an admixture; 180 to 250 parts of cement; 9 to 12 parts of toner; and 40 to 70 parts of water. The admixture comprises the following components in percentage by mass: 5%-7% of fibers, 6.2%-6.7% of rubber powder, 10%-12% of silicon powder, 2.9%-3.2% of a water reducing agent, 36.1%-36.7% of carborundum and 35%-40% of quartz powder; according to the preparation method of the colored pervious concrete, the cement paste formed by the cement and the admixture is mixed with the aggregate in three times, so that the water permeability and the strength of the colored pervious concrete are improved. The colored pervious concrete is goodin water permeability, strength, frost resistance and other properties, long in service life and suitable for being applied to actual engineering.

Disclosed herein is a horizontal deflection coil for a deflection yoke. The horizontal deflection coil includes an inner pincushion improving section connected to a screen bent, and sub-sections connected to the inner pincushion improving section. The inner pincushion improving section is disposed in an angular range of 45 to 60 degrees. The sub-sections include a horizontal color registration improving section for preventing a horizontal component of a green color from being widened, and a vertical color registration improving section for preventing a vertical component of the green color from being widened.

The invention relates to a device and a method for determining 8-isoprostaglandin F2 alpha in urine, and belongs to the field of analytical chemistry. The method comprises the following steps: injecting a prepared sample, conveying the sample by using an enrichment pump, and enriching the sample by using a graphene oxide bonded silica gel solid-phase extraction column; after the sample enrichmentis finished, switching through a six-way valve, conveying a mobile phase by using an analysis pump, eluting the solid-phase extraction column from a flow direction opposite to the sample enrichment direction, separating eluted components through the analysis column, and detecting and determining the content of to-be-analyzed components in the sample through a detector. By using the online solid-phase extraction method, high-multiple enrichment of the sample on the enrichment column is realized; under the precondition that a chromatographic peak is not obviously widened, the sample injection amount of a sample is increased by nearly three orders of magnitudes, the analysis sensitivity of the method is greatly improved, and the content of 8-isoprostaglandin F2 alpha with the order of magnitude of pg/mL in a urine sample can be accurately determined. And a sensitive, accurate and reliable new method is provided for research on correlation between smoking and oxidative stress reaction.