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57results about How to "Reduce the level of disturbance" patented technology

Model test apparatus for stimulating tunnel excavation process

The invention discloses a model test apparatus for stimulating a tunnel excavation process, and belongs to the field of underground engineering test. Prototaxic sandy soil is adopted as a stratum condition, a lining structure adopts a stress similar galvanized iron thin wall cylinder, a non-contact strain displacement measurement and analysis system is adopted to observe the stratum deformation in the excavation process in a whole course real time manner, and an airbag loading system is adopted to simulate different embedded depths of a tunnel. A model opening mode is a loading and opening mode; and the test apparatus can be used to stimulate the excavation processes of an unlined tunnel and a lining structure possessed tunnel under different embedded depths. The stress similar galvanized iron thin wall cylinder is adopted to stimulate the lining structure, a built-in water capsule system is adopted to stimulate the excavation process and measure force and deformation, and the pressure of soil on the lining structure and the development rule of the pressure under different embedded depths are analyzed. The apparatus provides scientific understanding for the pressure change of surrounding rocks and the deformation mechanism of the stratum in the tunnel excavation process, and provides theoretic bases for tunnel design and construction.
Owner:BEIJING UNIV OF TECH

An In-Situ Measurement System for Soil Saturated Hydraulic Conductivity and Air Conductivity

The invention discloses an in-situ measurement system for soil saturated hydraulic conductivity and air conductivity, which includes an air supply source (1) and a water supply source (9), and is characterized in that the measuring cylinder (7) is equipped with a water inlet (8), the water inlet (8) is tightly connected to the water supply source (9) through the first connecting hose (10); the top of the measuring cylinder (7) is airtightly connected to the rubber plug (6), and the rubber plug (6) Connect the tee (4), a branch pipe of the tee (4) is sealed to the gas supply source (1) through the second connecting hose (12), the gas supply source (1) is connected to the gas flow regulating valve (2) and the gas The flowmeters (3) are connected in series; the other branch of the tee (4) is connected to the air pressure measuring meter (5) through the third connecting hose (13); this system can realize in-situ soil air conductivity and soil saturation The continuous observation of hydraulic conductivity reduces the disturbance to the measured soil, makes the measurement results more accurately reflect the actual situation, and ensures that the soil air conductivity and soil saturated hydraulic conductivity are consistent with the measured soil, laying the foundation for establishing a correct quantitative relationship between the two. foundation.
Owner:张振华

Sewage treatment sediment scraping mechanism and method thereof

ActiveCN111151036ASame scraping effectReduce the level of disturbanceSettling tanks feed/dischargeSettling tanks safety mechanismsSewageSewage treatment
The invention belongs to the technical field of sediment scraping, and particularly relates to a sewage treatment sediment scraping method which comprises the following steps: (1) scraping: and (2) resetting. In the working process, the scraping step and the resetting step are alternately performed, and sediments in a sedimentation tank are intermittently pushed forwards and finally collected intoa sedimentation pit in the sedimentation tank. According to a scraping mechanism designed by the invention, supporting plates and scraping plates are designed to be arc-shaped, the upper ends of thetwo scraping plates in the same scraping unit are in smooth transition before or after swinging upwards, and sewage at the upper side part stably flows through a transition arc-shaped surface formed by the two scraping plates. The scraping mechanism is further provided with flow stabilizing plates, sewage on the lower side in the sedimentation tank can stably flow through the lower sides of the two flow stabilizing plates in the scraping units in the resetting process of the scraping units, and the disturbance degree of the scraping mechanism on the sewage in the sedimentation tank in the forward scraping or resetting process is reduced.
Owner:HANGZHOU FUYANG WEIWEN ENVIRONMENTAL PROTECTION TECH CO LTD

Technology for preparing double-loaded or multi-loaded liposome through liposome fusion induction

The invention belongs to the field of medicines and relates to a technology for preparing double-loaded or multi-loaded liposome through liposome fusion induction. The technology utilizes liposome fusion induction to prepare a double-loaded or multi-loaded liposome. The technology provides a feasible solution scheme for double-loaded or multi-loaded liposome preparation. The liposome realizes synergism of two or more drugs in vitro and vivo through colocalization of two or more drug structures and cell levels and provides a novel choice for clinical, safe and effective combined drug administration.
Owner:SICHUAN UNIV

System and method for local ex-situ remediation of irritant peculiar smell site

The invention discloses a system and method for local ex-situ remediation of an irritant peculiar smell site. The method comprises the following steps: pumping out underground water in the irritant peculiar smell site, and preparing a remediation agent by utilizing original underground water of the site; and adding the remediation agent in a manner of in-situ injection and stirring in order to remediate irritant peculiar smell soil and underground water. The remediation system comprises a tube well dewatering system, a water storage system, an agent dispensing system and an injecting and stirring system which are sequentially connected in the liquid flow direction; the medicine dispensing system is also connected with an agent storage system; and the restoration system further comprises aflexible isolation system and a peculiar smell monitoring and early warning system. The system and the method for local ex-situ remediation of the irritant peculiar smell site can greatly reduce the remediation water consumption, reduce the water treatment work amount and reduce the remediation cost, and can realize efficient, safe, low-cost and low-disturbance remediation of the irritant peculiarsmell site by reasonably adjusting the agent concentration and the disturbance strength to soil.
Owner:广州市璞境生态保护技术有限公司

Engineering exploration wire line coring drilling tool suitable for seafloor drilling machines

The invention discloses an engineering exploration wire line coring drilling tool suitable for seafloor drilling machines. The engineering exploration wire line coring drilling tool includes an outertube assembly and an inner tube assembly; the outer tube assembly includes an elastic clamp blocking head, an elastic clamp chamber, an outer tube, a hole expanding machine and a drilling bit which are connected in sequence; the inner assembly includes a salvaging spearhead, an elastic clamp locating mechanism, an elastic clamp support, a single moving mechanism, an inner tube joint, a backwater ball valve, an inner tube and a core screened pipe; the salvaging spearhead is connected with the elastic clamp locating mechanism, and the elastic clamp locating mechanism is connected with the elastic clamp support; a dangling loop is arranged on the side wall of the elastic clamp support and is placed on a stay ring on the inner wall of the outer tube; the elastic clamp support is connected withthe single moving mechanism, and the single moving mechanism is connected with the inner tube joint; the lower end of the inner tube joint is connected with the upper end of the inner tube, and the core screened pipe is arranged in the inner tube; and the single moving mechanism includes a mandrel, a casing pipe end cover, an upper force transmission clamp sleeve and a lower force transmission clamp sleeve. According to the engineering exploration wire line coring drilling tool suitable for the seafloor drilling machines, the single moving performance is stable, the centering effect of a bearing is good, the disturbance degree for a soil sample is low, and the condition of sticking is prevented when the inner tube assembly is salved.
Owner:HUNAN UNIV OF SCI & TECH

Visual test device and test method for carrying out anchor plate drawing

The invention discloses a visual test device for carrying out anchor plate drawing, which comprises an anchor plate, a test box body, a heavy rainfall-drought extreme climate simulation system, a loading system and a measuring system, and is characterized in that the test box body is of a box body structure of which the front side surface can be turned over and opened and the top is provided with a drawable cover plate; the heavy rainfall-drought extreme climate simulation system comprises an artificial rainfall device and an infrared baking lamp; the loading system comprises a loading frame, an electric actuator, a pulley block and a steel wire rope connected to the pulley block; and the measuring system comprises a load displacement sensor, a data acquisition instrument, a multi-layer soil parameter detector, a high-pixel digital camera and a computer. The problem that the weakening effect of the uplift bearing capacity of the anchor plate cannot be accurately analyzed due to the fact that a previous test device does not simulate the heavy rainfall-drought extreme climate is solved, and a multi-directional pull-out test of the anchor plate under a special condition is achieved.
Owner:HUNAN UNIV OF SCI & TECH +1

A touch control display panel

InactiveCN101533172AThe delay value is not easyImprove display artifactsStatic indicating devicesInput/output processes for data processingComputer scienceElectrode
Provided is a touch control display panel which has a plurality of pixel regions, wherein, each pixel region is provided with a shade area and a translucent area, the touch control display panel includes a first substrate; a second substrate located opposite to the first substrate, a plurality of touch control gap objects and a plurality of induction electrodes, respectively located on the first substrate and second substrate, in which a first gap (G [1]) is provided between each touch control gap object and the corresponding induction electrode; a barrier wall structure, located at one of the first substrate and the second substrate, in which the barrier wall structure is located in the shade area of the pixel region, and a second gap (G [2]) is provided between the barrier wall structure and the other one of the first substrate and the second substrate, and G [1] <G [2] <4G [1]; as well as a display medium, located between the first substrate and the second substrate.
Owner:AU OPTRONICS CORP

High-precision simple calibration method for soil moisture sensor

The invention discloses a high-precision simple calibration method for a soil moisture sensor, and belongs to the technical field of measurement. The technical problem of how to provide the high-precision simple calibration method for the soil moisture sensor is solved. The method comprises the following steps: determining a standard soil moisture sensor; placing the standard sensor and the to-be-detected sensor in the same soil sample; dehumidifying when the sample soil is saturated, and automatically collecting output values of the two sensors; and performing quadratic regression fitting onthe output values of the two sensors to obtain a formula to complete calibration. According to the method, the sensor continuous change value of the water content of the sample soil from a saturated state to an air-dried state is completely recorded, the resolution reaches 1%, and the measurement precision is enhanced; meanwhile, the to-be-detected sensor only needs to be placed in the sample soilonce, multiple sample soil preparation processes are reduced, and the steps are simplified. The method is suitable for high-precision simple calibration of various types of soil moisture sensors, andhas the advantages of meeting the high-precision requirement of scientific research and meeting the efficient and simple requirement of batch production.
Owner:武汉美网通科技发展有限公司

Dynamic voltage restorer-based double-fed asynchronous wind generator unit control method

The invention relates to a dynamic voltage restorer-based double-fed asynchronous wind generator unit control method. The method comprises the following steps: (1) building a dynamic voltage compensator-based double-fed asynchronous wind generator unit control system; (2) when a sudden change of a voltage is caused by a fault, obtaining a suddenly changed voltage vector for negative and negative sequence separation by a dynamic voltage restorer DVR; (3) calculating to-be-compensated voltage amount changing along with the time, and simultaneously giving a control signal; (4) outputting the voltage amount by the dynamic voltage restorer DVR, compensating a stator terminal voltage of a variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage; (5) obtaining a suddenly changed new grid voltage vector when the sudden change is caused again during a fault period; (6) calculating the to-be-compensated voltage amount changing along with the time according to the suddenly changed voltage vector; and (7) outputting the voltage compensation amount by the dynamic voltage restorer DVR, and compensating the stator terminal voltage of the variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage. The dynamic voltage restorer-based double-fed asynchronous wind generator unit control method can achieve stable fault ride-through.
Owner:WIND POWER TECH CENT OF GANSU ELECTRIC POWER +4

Design method of deeply-buried PBA subway station section

ActiveCN110566223ASolve comprehensive technical problemsSolving the challenges of groundwater treatmentUnderground chambersTunnel liningAccessory structureSubway station
The invention relates to a design method of a deeply-buried PBA subway station section. The design method includes the following steps that a, a void is detected; b, a composite anchor rod pile (14) is driven on the ground; c, a large pipe shed (4) is applied; d, small pilot tunnels (2 and 3) are constructed; e, grille arch centers for the small pilot tunnels (2 and 3) are erected; f, initial supporting is conducted on the inner parts of the small pilot tunnels (2 and 3), and then side piles (5 and 6) are applied in the small pilot tunnels (2 and 3) correspondingly; g, a main body arch part (1) is excavated, initial supporting is conducted, and a secondary lining structure (9) is poured by concrete; h, a soil mass of a lower main body center (10) is excavated; i, a bottom plate (11), a side wall (12) and a middle plate (13) of a lower secondary lining structure of the lower main body center (10) are constructed; and j, an accessory structure is applied, and a complete station structureis formed. According to the method, the construction safety, the construction quality and the construction period can be ensured, the cost can be saved, and the construction efficiency can be improved; and section structure design is reasonable, the overall structure is stable, construction is easy and convenient, and the use effect is good.
Owner:BEIJING NO 4 MUNICIPAL CONSTR ENG +1

Method for laying electrochemistry desalting external anode through magnesium phosphate cement and carbon fiber sheet

The invention relates to a method for laying an electrochemistry desalting external anode through magnesium phosphate cement and a carbon fiber sheet, and belongs to the technical field of reinforced concrete structure electrochemistry desalting. The magnesium phosphate cement is prepared from magnesia, phosphate, retarder, water and electric conduction materials according to a certain proportion; the surface of concrete to be desalted is polished to be flat and evenly coated with the magnesium phosphate cement, the thickness is 2 mm-3 mm, and the magnesium phosphate cement is smoothed; the carbon fiber sheet is attached to the surface of the magnesium phosphate cement and rolled in the fiber direction through a roller, bubbles are extruded out, and therefore the carbon fiber sheet is tightly attached to the working surface; after the magnesium phosphate cement is hardened, a copper wide adheres to the surface of the carbon fiber sheet to be connected with a positive pole of an external direct-current power source for a desalting test. The method for preparing the electrochemistry desalting external anode has the advantages that the material cost is low, laying is easy, convenient and rapid, the desalting effect is good, and the application range is wide, and has good application and popularization prospects.
Owner:BEIJING UNIV OF TECH +1

On-site testing method for dry density of fine sand subgrade

The invention relates to the field of building engineering, and in particular relates to an on-site testing method for the dry density of fine sand subgrade. The method is characterized by at least comprising the following steps: taking out a certain amount of fine sand test pieces from the fine sand subgrade so as to carry out interior dry density testing, measuring the dry density of the fine sand test pieces by a ring cutter, calculating the ratio of the two dry densities as a correction coefficient of the ring cutter, and correcting the dry density in on-site testing of the fine sand subgrade according to the correction coefficient of the ring cutter. The method has the advantages of firstly, being capable of reducing a disturbance zone formed in pressing of the ring cutter and reducing the disturbance degree to the fine sand subgrade by adopting the thin-wall ring cutter, secondly being capable of increasing total mass of samples and relatively reducing the test errors due to disturbance by adopting the large-volume ring cutter, and finally avoiding errors formed by pressing disturbance of the ring cutter through utilizing a large compaction cylinder to stimulate the on-site sand sample and adopting the correction coefficient of the ring cutter to reflect the difference of the test value of the ring cutter and the true value.
Owner:SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD

Aerial operation robot for power transmission line maintenance

The invention discloses an aerial operation robot for power transmission line maintenance, which comprises an unmanned aerial vehicle platform, a Delta parallel mechanism and a cutting operation mechanism, wherein the Delta parallel mechanism is fixed below the unmanned aerial vehicle platform, and the cutting operation mechanism is fixed at the tail end of the Delta parallel mechanism; the cutting operation mechanism at least comprises a clamping mechanism supporting plate, a clamping mechanism and an electric heating wire; the clamping mechanism is fixed to the clamping mechanism supportingplate, a containing space is formed in the clamping mechanism and used for containing a power transmission line, and the electric heating wire is fixed to the clamping mechanism and transversely penetrates through the containing space. The aerial operation robot provided by the invention can cut off the floating hanging object from the upper side; since the electric heating wire directly cuts offthe connection point of the floating hanging object and the power transmission line, the situation that residues are left does not exist, and the cutting effect is better.
Owner:HUNAN UNIV

Soil sampler provided with annular cutter

InactiveCN108332991AAdjustable lengthApplicable drilling depth requirementsWithdrawing sample devicesAnnular cutterEngineering
The invention discloses a soil sampler provided with an annular cutter. The technical scheme is characterized in that the soil sampler provided with the annular cutter comprises an adjusting rod, wherein the adjusting rod comprises a connection section, a handle section and an extension section arranged between the connection section and the handle section; the connection section is connected witha fixing sleeve; insertion rods are fixedly connected with end faces, facing the connection section, of the extension section and the handle section, insertion holes allowing snap-in of the insertionrods are formed in end faces, facing the handle section, of the connection section and the extension section, two through holes communicated with the insertion holes are formed in the side surface ofeach of the extension section and the connection section, fixing rods are arranged in the through holes, and fixing holes allowing penetrating of limit rods are formed in side surfaces of the insertion rods. After the fixing rods are pulled out of the fixing holes, the inserting rod can be pulled out of the insertion holes, and accordingly, the extension section, the connection section and the handle section are relatively separated, the length of the adjusting rod can be changed by increasing or decreasing the number of the extension sections, and the soil sampler provided with the annular cutter meets requirements of different environmental conditions for drilling depth of the soil sampler.
Owner:浙江诚力工程项目管理有限公司

Along-slope shear wall building development platform and construction method thereof

The invention discloses an along-slope shear wall building development platform. The along-slope shear wall building development platform comprises embedded type shear walls (1) arranged along a slope in parallel, wherein the lower ends of the shear walls (1) are arranged in stable rock bodies of a side slope (4), and the upper ends of the shear walls (1) are positioned at the same horizontal height; frame beams (2) are arranged at the upper ends of the shear walls (1), and the frame beams (2) are connected with the shear walls (1) through reinforced concrete; and a platform (3) is arranged at the upper ends of the frame beams (2), and the platform (3) is connected with the frame beams (2) through reinforced concrete. The along-slope shear wall building development platform has the benefits that the cross section of the shear walls along the slope is much smaller than that of shear walls directly dug, so that digging area is small, and disturbance caused to the side slope by construction is small; 2, the width of the shear walls along the slope is large, so that high vertical bearing capacity can be provided; 3, the shear walls also can stand the downward sliding force of the side slope to a certain degree, so that the stability of the side slope is facilitated; and 4, a building can be constructed at the upper part of the platform, the side slope can be fully utilized, and compared with direct digging construction, the along-slope shear wall building development platform is small in engineering quantity, simple in construction and high in safety.
Owner:WUHAN UNIV

Plankton collection device and collection method

The invention relates to water biomass measurement, in particular to a plankton collection method and collection device. The collection device comprises a collection tank, a yarn box, bolting silk and a fixing device, the collection tank is a rectangular solid or cube without a bottom or top and comprises a front side wall, a rear side wall, a left side wall and a right side wall, the yarn box comprises a long barrel-shaped box body, a yarn shaft and a shaft lever, the yarn shaft and the shaft lever are arranged in the box body, the long barrel-shaped box body is arranged along the outer side of the front side wall of the collection tank, the yarn shaft sleeves the shaft lever, two ends of the shaft lever extend out of the yarn shaft and are connected with two ends of the long barrel-shaped box body, a linear opening parallel to the yarn shaft is formed in the outer wall of the barrel-shaped box body, positioned below the lower edge of the bottom of the front side wall and parallel to the lower edge of the bottom of the front side wall, the length of the linear opening is matched with that of lower edge of the bottom of the front side wall, one end of the bolting silk is fixedly wound on the yarn shaft, and the other end of the bolting silk extends out of the linear opening, can be pulled to pass and seal the bottom of the collection tank and then is fixed onto the fixing device on the rear side wall.
Owner:RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY

Mounting method, dismounting method and using method of hollow cylinder sample

The invention discloses a mounting method, a dismounting method and a using method of a hollow cylinder sample. The hollow cylinder sample comprises an inner cylinder, a consolidation outer cylinder, a permeable top cover and a drainage chassis, wherein the inner cylinder comprises four inner cylinder assemblies which are arranged in an arc shape, fixing grooves and water permeable holes; the consolidation outer cylinder comprises two semi-circular consolidation outer cylinder assemblies, a fixing table, a fixing hole A, locking blocks, limiting grooves and limiting blocks; a through hole is formed in the center of the permeable top cover; the whole drainage chassis is in a disc shape and provided with water collecting holes. The installation and connection adopts a mortise and tenon buckling mode, so that a soil sample can be more accurately close to the required standard size; a vacuum bin with relatively high leakproofness is formed, so that water and gas can be conveniently discharged, and the water content can be more accurately controlled; and moreover, the disturbance degree on the soil sample during sample disassembly is effectively reduced, secondary cutting on the inner diameter and the outer diameter of the soil sample is avoided, and the possibility is provided for rapidly manufacturing the saturated hollow cylindrical sample with the inner diameter and the outer diameter of the international common standard at one time.
Owner:UNIV OF JINAN

Range hood and fan assembly thereof

PendingCN109990328AReduce radial flowReduced circular flowDomestic stoves or rangesLighting and heating apparatusGratingEngineering
The invention relates to a range hood and a fan assembly thereof; a noise reduction module is additionally arranged at an air inlet of a volute on the fan assembly, the noise reduction module is optimally designed, the noise reduction module can achieve the effects of smoothing air flow at the air inlet and reducing the turbulence intensity of the air flow at the air inlet, and the purpose of reducing noise of the range hood is achieved under the condition that the air volume and air pressure of the range hood are not affected. An annular grating of a noise reduction grating can reduce radialflow of air flow at the air inlet, a radiation grating can reduce circumferential flow of the air flow at the air inlet, and therefore the disturbance degree of the air flow is reduced. The air inletends of all the annular gratings are matched with the airflow velocity contour distribution at the air inlet, so that airflow with the same velocity can enter the annular gratings at the same time; the distribution direction of the annular grating is consistent with the airflow speed direction of the air inlet. On one hand, airflow disturbance can be reduced, noise is reduced, and on the other hand, the air volume and the air pressure are not affected.
Owner:QINGDAO HAIER SMART TECH R & D CO LTD

Wooden energy dissipation and shock absorption device and wooden structure system with same

The invention discloses a wooden energy dissipation and shock absorption device and a wooden structure system with the same. The wooden energy dissipation and shock absorption device comprises two connecting sections, wherein the two connecting sections are connected through an energy dissipation section. The energy dissipation section comprises two sections of wooden connecting pieces, wherein the two sections of the wooden connecting pieces are connected through soft steel shear dampers, dovetail-shaped tenons are separately arranged at the outer ends of the two wooden connecting pieces, dovetail-shaped grooves are separately formed in the two connecting sections, and the tenons of the two wooden connecting pieces are separately inserted into the grooves of the two connecting sections. The connecting sections are wooden columns or wooden panel walls. When the connecting sections are the wooden columns, friction plates are separately arranged at the outer ends of the two wooden connecting pieces. A main structure of the wooden structure system is rigidly connected with the wooden energy dissipation and shock absorption device. According to the wooden energy dissipation and shock absorption device, earthquake energy can be dissipated, the damage to wooden structure buildings under an earthquake is reduced, and energy dissipation components after the earthquake are convenient toreplace. The wooden energy dissipation and shock absorption device and the wooden structure system with the same can be used for improving the seismic performance of existing wooden structure buildings and building new wooden structure buildings.
Owner:BEIJING UNIV OF CIVIL ENG & ARCHITECTURE

Construction method suitable for soft rock bedding tunnel

ActiveCN110080782AControl deformationImprove the stability of surrounding rockUnderground chambersTunnel liningTunnel constructionEngineering
The invention relates to the field of tunnel support, in particular to a construction method suitable for a soft rock bedding tunnel, which comprises the following steps: S1, excavating reverse-tilting upper step core soil, and constructing a first support system; S2, excavating core soil of the lower step of the reverse side, and constructing a second supporting system; S3, excavating upper stepcore soil along the inclined side, and constructing a third support system; S4, excavating core soil of the lower step along the inclined side, and constructing a fourth support system; and S5, disassembling the temporary support, and constructing a secondary lining. According to the construction method, reasonable excavation steps and supporting structures are adopted in a targeted mode accordingto the bias deformation characteristic of the bedding tunnel and the surrounding rock stability difference, deformation during tunnel construction can be effectively controlled, surrounding rock self-bearing is given to full play, the surrounding rock stability is improved, and therefore the construction risk and the engineering cost are reduced.
Owner:CHINA RAILWAY ERYUAN ENG GRP CO LTD

Water sample collection system and water sample collection method for taking sample from water drained from pump pipe

The invention relates to a water sample collection system and a water sample collection method for taking a sample from water drained from a pump pipe. The water sample collection system is formed as follows: the sampling end of a pipe orifice plugged sampling device is arranged in a water drainage pipe orifice of a quasi-water sampling pump pipe; the output port of the pipe orifice plugged sampling device is connected to the input port of a self-priming pump through a hose; the output port of the self-priming pump is connected with a three-way joint through a pipeline; an upper opening of the three-way joint is connected with the input port of a mass stabilizer through a pipeline; a bypass opening of the three-way joint is connected with a flow division control valve through a pipeline; the output port in the upper end of the mass stabilizer is connected with a split combined type sampling bottle through a pipeline. The water sample collection system disclosed by the invention can realize fast mounting and center positioning of a water outlet pump pipe of a water pump, so that the quickness and the convenience of sampling operation are improved; the water sample and environment-sensitive substances in the water sample pass through the collection system under a state of relatively dynamic balance, so that the disturbance is low, the escape quantity of volatile substances is small, and the fidelity of the sample is improved.
Owner:BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY

Water sample collecting system and method for surface water and spring water

The invention relates to a water sample collecting system and method for surface water and spring water. According to the water sample collecting system, an input port of a self-priming pump is connected with a water inlet pipe or a spherical filter through a pipeline, an output port of the self-priming pump is connected with a tee joint through a pipeline, an upper port of the tee joint is connected with an input port of a quality stabilizer through a pipeline, a bypass port of the tee joint is connected with a flow-distributing control valve, and an output port in the upper end of the quality stabilizer is connected with a split combined sampling bottle through a pipeline. Firewood, EVA sheets and other solid objects in the water and solid particle substances in the water can be effectively filtered away, a sample is in a pressure-bearing and oxygen-isolating state once entering the water sample collecting system, the collected water sample passes through the water sample collecting system when in a relatively dynamic balance state and is little disturbed, the probability of volatile substance escape is lowered, and therefore the problem that by the utilization of a direct filling mode, when a water sample containing environmentally-sensitive substances is collected, sample distortion occurs is solved.
Owner:BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY

Large-scale deepseated landslide prevention and control structure and construction method thereof

The invention relates to the field of landslide prevention and control, in particular to a large-scale deepseated landslide prevention and control structure and a construction method thereof. The large-scale deepseated landslide prevention and control structure comprises a crown beam and a water collection well, wherein a plurality of guard piles are circumferentially arranged on the outer side ofthe water collection well, and the crown beam is connected with all the guard piles and arranged on the upper parts of the guard piles. The large-scale deepseated landslide prevention and control structure is provided with the anti-slide piles capable of providing large resistance and also provided with the water collection well with strong drainage capacity; little disturbance is caused to a slide mass, a machine can be used for construction, and the large-scale deepseated landslide prevention and control structure is suitable for landslide prevention and control in a development stage; andbesides, the overall bending resistance is higher, the construction is easier and safer, and the risk of excavating the water collection well and the anti-slide piles is reduced.
Owner:CHINA RAILWAY ERYUAN ENG GRP CO LTD

Electron microscope comprising microscope carrier

The invention relates to an electron microscope which comprises a microscope carrier, a first drive unit, a flow stabilization unit and an electron source. The microscope carrier bears a to-be-measured object. The first drive unit drives a first liquid to flow along a first flow path, wherein the first flow path passes through the to-be-measured object. The flow stabilization unit is arranged on the first flow path to stabilize the flow of the first liquid, wherein the first liquid flows through the stabilization unit and the microscope carrier in sequence. The electron source provides an electron beam to the to-be-measured object.
Owner:IND TECH RES INST

Rotary drawing film blowing production technology

ActiveCN111361118ASmall rubbing speedNeat edgesAir velocityElectric machine
The invention provides a rotary drawing film blowing production technology. In a rotary drawing process, the rotating speed of an either-rotation motor is gradually reduced with increase of an included angle between a central axis of a fourth horizontal moving guide roller and a reference direction, and the rotating speed of the either-rotation motor is gradually increased with reduction of an included angle value; when the included angle value is zero, the rotating speed of an either-rotation motor reaches the maximum value; and a central control unit controls output air speeds of a variable-frequency fan at all moments according to the included angle between the central axis of the fourth horizontal moving guide roller and the reference direction. According to the technology, the problems of scratching and pulling damage of a thin film can be solved, besides, a film roll obtained by final rolling is relatively compact, and the edges are relatively neat.
Owner:GUANGDONG JINMING MACHINERY

An Excavation Method in the Vault Direction for Expansion of Existing Tunnel

The invention discloses an excavation method in the direction of the vault when the existing tunnel is expanded. First, the excavation surface is divided into two parts, left and right, and the left half is excavated first, and a temporary partition wall and a steel arch are constructed. The left half is excavated 1 to 2 times the diameter of the single hole, and then the right half is excavated, and a steel arch is constructed, and the secondary lining is applied after the surrounding rock becomes stable, and so on, until the construction is completed. This excavation method can reduce the degree of disturbance to the surrounding rock during the construction of the roof for the poor working conditions of the surrounding rock. The excavation method also discloses an assembleable cylindrical temporary support, which is used in conjunction with a temporary partition wall after excavation to form a temporary closed ring and maintain the stability of surrounding rock.
Owner:GUIZHOU UNIV

Control method of doubly-fed asynchronous wind turbine based on dynamic voltage compensator

The invention relates to a dynamic voltage restorer-based double-fed asynchronous wind generator unit control method. The method comprises the following steps: (1) building a dynamic voltage compensator-based double-fed asynchronous wind generator unit control system; (2) when a sudden change of a voltage is caused by a fault, obtaining a suddenly changed voltage vector for negative and negative sequence separation by a dynamic voltage restorer DVR; (3) calculating to-be-compensated voltage amount changing along with the time, and simultaneously giving a control signal; (4) outputting the voltage amount by the dynamic voltage restorer DVR, compensating a stator terminal voltage of a variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage; (5) obtaining a suddenly changed new grid voltage vector when the sudden change is caused again during a fault period; (6) calculating the to-be-compensated voltage amount changing along with the time according to the suddenly changed voltage vector; and (7) outputting the voltage compensation amount by the dynamic voltage restorer DVR, and compensating the stator terminal voltage of the variable-speed and constant-frequency double-fed induction generator DFIG to stabilize the stator terminal voltage. The dynamic voltage restorer-based double-fed asynchronous wind generator unit control method can achieve stable fault ride-through.
Owner:WIND POWER TECH CENT OF GANSU ELECTRIC POWER +4

Water sampling system and water sampling method for surface water and spring water

The invention relates to a water sample collection system and a water sample collection method for surface water and spring water. The water sample collection system is connected to a water inlet pipe or a spherical filter at the input port of a self-priming pump through a pipeline. The output port of the suction pump is connected with a tee through a pipeline, the upper port of the tee is connected with the input port of the mass stabilizer through a pipeline, and the bypass port of the tee is connected with a diversion control valve, and the The upper output port of the upper end is connected to the split combined sampling bottle through a pipeline. The invention can effectively filter solids such as firewood and plastic sheets in water and solid granular substances in the water body. When the sample enters the water sample collection system, it is in a state of pressure and oxygen isolation. The collected water sample is in a relatively dynamic state. In a balanced state, through the water sample collection system, there is little disturbance, which reduces the probability of volatile substances escaping, thus solving the problem of sample distortion caused by the direct filling method of collecting water samples containing environmentally sensitive substances.
Owner:BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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