85results about How to "Impact measurement" patented technology

The invention discloses a method for measuring the influence of users on the topic hierarchy for MicroBlog. The method comprises the steps of 1, calculating the similarity of MicroBlog texts; 2, obtaining a topic set according to the dynamic clustering algorithm correlation; 3, measuring the influence of the users on the topic hierarchy according to standards: calculating the information propagation influence of the users, calculating the MicroBlog value influence of the users and calculating the activeness influence of the users; 4, establishing a user influence measurement model. According to the method, the effects of the three factors of information propagation, user activeness and user MicroBlog value on the influence of the users are comprehensively considered, the user influence measurement model is established, the influence of the users on the topic hierarchy can be measured more accurately through the model, then the users playing a key role in the topic propagation can be found, and public opinion monitoring and tracing in the MicroBlog network have the guaranteeing and monitoring effects.

A method of determining a wavefront of a received light beam includes: (a) receiving a light beam; (b) producing a group of light spots from the light beam; (c) qualifying a set of the light spots for use in determining a wavefront of the received light beam; and (d) determining the wavefront of the received light beam using the qualified set of light spots. Qualifying the set of light spots includes, for each light spot: calculating a first calculated location of the light spot using a first calculation algorithm; calculating a second calculated location of the light spot using a second calculation algorithm; and when a difference between the first and second calculated locations for the light spot is greater than an agreement threshold, excluding the light spot from the set of light spots and / or from being employed in determining the wavefront of the received light beam.

The invention provides a device and a method suitable for online testing of particulate matters in a high-pressure gas pipeline. The device comprises an online testing unit, wherein the online testing unit comprises a main sampling nozzle and a flow distributor, which are sequentially connected in series; the front end of the main sampling nozzle stretches into the to-be-tested high-pressure gas pipeline, and the tail end of the main sampling nozzle is connected with a flow distributor air inlet in series; a cavity is formed in the flow distributor, two pipelines including a main path and a side path are separated from the cavity, the main path is sequentially connected with a secondary sampling nozzle, an online particulate matter grain size spectrometer and a first mass flow controller, and the side path is connected with a second mass flow controller in series; and after the main sampling nozzle carries out sampling in the high-pressure gas pipeline and the sampled gases enter the cavity by diffusion from the flow distributor air inlet, the sampled gases are discharged from the secondary sampling nozzle and the outlet of the side path. The device can further comprise an offline testing unit and a long-term online monitoring unit. According to the device provided by the invention, the long-term online testing on the particulate matters in the high-pressure gas pipeline can be realized.

Apparatus, methods and articles of manufacture are provided to address performance gaps within an organization. Initially, a gap between actual work performance and expected work performance by a group of one or more persons within an organization is identified. Knowledge and / or skills required to reduce the performance gap are identified and a training program for supplying the group with the identified knowledge and / or skills is selected. A pre-test is administered to the group on a date prior to the training date, and a post-test is administered to the group on a date after training has occurred. An identified performance metric is measured before and after training to determine if the group has changed its behavior to an acceptable degree within the organization. The cost associated with administering the training to the group is determined, and a return on investment value may be calculated.

A method of determining a wavefront of a received light beam includes: (a) receiving a light beam; (b) producing a group of light spots from the light beam; (c) qualifying a set of the light spots for use in determining a wavefront of the received light beam; and (d) determining the wavefront of the received light beam using the qualified set of light spots. Qualifying the set of light spots includes, for each light spot: calculating a first calculated location of the light spot using a first calculation algorithm; calculating a second calculated location of the light spot using a second calculation algorithm; and when a difference between the first and second calculated locations for the light spot is greater than an agreement threshold, excluding the light spot from the set of light spots and / or from being employed in determining the wavefront of the received light beam.

The invention discloses a coal rock upward borehole gas parameter measurement method. Firstly, upward drilling is carried out on a coal bed in a coal rock roadway, and the borehole is as deep as to the coal bed; then, a detecting and receiving device is arranged, the detecting and receiving device comprises a first pipe body, a second pipe body and a third pipe body connected in sequence, the upper surface of the tail part of the third pipe body is uniformly provided with a plurality of columns of pipe holes at intervals, a cylindrical iron ring is sleeved between adjacent columns of pipe holes, and a drilling rig is used for sending the third pipe body to the bottommost part of the borehole; a sealing device is used for sealing the borehole, a concrete sealing material is combined to carry out sealing processing on the remaining part; a pressure-resisting test is carried out to test borehole sealing effects; and after qualified test, a measurement device is used for measuring gas parameters. Influences on measurement of the gas parameters as the traditional soft coal rock upward borehole is likely to collapse can be well overcome, and the method is particularly suitable for gas parameter measurement in the soft coal rock upward borehole.

The invention discloses a liquid level detection device and a liquid level detection method. The liquid level detection method comprises the following steps that: through a probe movement mechanism, driving a probe to carry out reciprocating motion relative to the liquid level of metal liquid in the liquid storage containing chamber of continuous casting equipment; through a probe position detection device, detecting the displacement information of the probe in real time, and sending the displacement information of the probe to a controller; and at a moment when the probe is in contact with the liquid level of the metal liquid in the liquid storage containing chamber, forming a loop by an electric signal conduction detection device, the probe and the continuous casting equipment, detectingloop conduction information by the electric signal conduction detection device, sending the loop conduction information to the controller, and judging the liquid level height of the metal liquid in the liquid storage containing chamber of the continuous casting equipment according to the loop conduction information and the displacement information of the probe. By use of the liquid level detection method, the liquid level of the metal liquid can be effectively detected so as to guarantee that vertical continuous casting equipment can successfully cast high-quality metal blanks.

The invention belongs to the technical field of a battery and especially relates to a Karl-Fischer reagent for electrolyte moisture detection and a preparation method thereof. The Karl-Fischer reagent comprises the following components by weight percent: 1-8% of iodine, 1-8% of sulfur dioxide, 2-10% of carbon tetrachloride, 10-30% of aniline, 10-30% of aniline hydriodate and 40-70% of hydroxyl-free alcohol ether compound. Compared with the present Karl-Fischer reagent containing methyl alcohol, 2-methoxyethanol, and the like, the Karl-Fischer reagent provided by the invention contains no hydroxyl compound, so that the Karl-Fischer reagent can be effectively prevented from having esterification reaction with a boracic additive in the electrolyte and further influencing the determination for trace water in electrolyte, and the detection accuracy can be guaranteed. Besides, the Karl-Fischer reagent provided by the invention contains no toxic or environmental pollution components, such as methyl alcohol and pyridine, so that the Karl-Fischer reagent is more safe and environment-friendly.

An algorithm locates valid light spots produced on an image detector by a wavefront of interest. The algorithm includes sequentially examining pixels of the image detector to determine for each of the pixels whether the light intensity detected by the pixel is greater than a threshold, When the pixel's detected light intensity is determined to be greater than the threshold, the algorithm includes: determining whether the pixel belongs to a valid light spot; and when the pixel is determined to belong to a valid light spot; saving data indicating a location for the valid light spot; and masking out a group of pixels of the image detector at the determined location such that the masked pixels are considered to have a light intensity less than the threshold for a remainder of the sequential examination.

The invention relates to a soil layer interfacial shear testing machine and a soil layer interfacial shear testing box. The soil layer interfacial shear testing box comprises an upper box body and a lower box body, the lower box body is provided with an inner cavity communicating with the upper box body for filling a testing soil layer, or the lower box body is provided with a resistance plate used for making friction contact with the testing soil layer in the upper box body, the upper end of the upper box body is open, an upper pressing plate used for pressing the testing soil layer in the upper box body is arranged at the power output end of a vertical loading mechanism, a lower guiding structure with the transverse guiding direction is arranged between the lower box body and a device frame, an upper guiding structure with the transverse guiding direction is arranged between the upper box body and the lower box body, and the power output end of a transverse loading mechanism is in transmission connection with the lower box body. The soil layer interfacial shear testing machine capable of testing soil layer interfacial shearing force, and the soil layer interfacial shear testing box used in the soil layer interfacial shear testing machine are provided by the invention.

The invention discloses a magnetic field sensor which comprises a shell which is in a cylindrical structure, a hollow skeleton which is a hollow columnar body, a segmented magnetic core, multiple sections of coils and an amplifying circuit, wherein the outer surface of the hollow skeleton is provided with a plurality of same annular grooves at equal spacings; the segmented magnetic core is arranged in a hollow part of the hollow skeleton and is formed by connecting multiple sections of magnetic core materials equal in length; the multiple coils respectively winds in the annular grooves of the hollow skeleton and are serially connected to the amplifying circuit; the amplifying circuit is arranged at one end in the shell and used for amplifying and outputting induction signals of the multiple coils. According to the magnetic field sensor disclosed by the invention, a working band is completely expanded and the influence of the sensor on magnetic field measurement is effectively reduced; moreover, the electric field interface of an environment surrounding is shielded and the accuracy of measuring magnetic field signals is guaranteed. The magnetic field sensor disclosed by the invention is small in volume, light in weight, and effectively applicable to engineering application of a ground transverse electric and magnetic field (TEM).

The invention provides a device and a method suitable for on-line detection of particulate matters in a high-temperature gas pipeline. The device comprises an on-line detection unit and a preheating sweeping unit, wherein the on-line detection unit comprises a main sampling subsystem, a secondary sampling subsystem, a particle matter grain size on-line analyzer and a first flow measurement control subsystem, which are connected in series; the secondary sampling subsystem comprises a gas flow distributor and a secondary sampling nozzle; the gas flow distributor is provided with a cavity and two gas outlets and is divided into a main path and a side path; the main path is connected with the secondary sampling nozzle, the particle matter grain size on-line analyzer and the first flow measurement control subsystem sequentially in series, and the side path is connected with a second flow measurement control subsystem in series; and the preheating sweeping unit is connected onto the pipeline between the main sampling subsystem and the secondary sampling subsystem in parallel and used for sweeping and preheating the pipeline of the whole system. The device further can comprise an off-line detection unit and a long-term on-line monitoring unit. According to the device, the long-term on-line detection of the particulate matters in the high-temperature gas pipeline can be realized.

The invention discloses a rainproof insect pest situation forecasting lamp and particularly relates to an insect pest situation forecasting lamp. The rainproof insect pest situation forecasting lamp comprises a lamp body, wherein the lamp body is provided with a light-emitting device emitting light for trapping insect pests and is provided with a rain sheltering component used for rain sheltering, capable of making light transmitted and reserved with gaps for insect pests to enter the lamp body and a filter device for filtering non-target insect pests, the rain sheltering component is located on the outer wall of the lamp body, and the filter device faces the position enabling insect pests to enter from the rain sheltering component and is located on the inner side of the rain sheltering component. The rainproof insect pest situation forecasting lamp has the advantages that the rainproof insect pest situation forecasting lamp can work in rainy days and the service life of the lamp is not affected.

The invention discloses a road surface levelness detection device for road construction. The device comprises a main body, a detection mechanism and a control panel, supporting frames are fixed to thetwo ends of the bottom of the main body, an electric telescopic rod is fixed to the bottom of the main body, a pressure sensor is fixed to the bottom of a mounting plate, and a movable frame is slidably connected to the lower portion of a fixed frame; and the control panel is fixed to the top of the main body, and a mounting frame is fixed to the lower portion of the third spring. The road surface levelness detection device for road construction is provided with a pressure sensor, a base plate and a rotating roller, the rotating roller below the fixing frame makes contact with the ground whenthe main body is pushed, and vibration generated by rotation of the rotating roller attached to the road surface is reduced under the elastic action of a first spring; when a protrusion is encountered, the rotating roller drives the movable frame to contract to enable the base plate at the top of the movable frame to make contact with the pressure sensor below the fixed frame, the pressure sensortransmits signals to the control panel at the top of the body to prompt workers, and the detection speed is increased while precision is improved.

The invention discloses a shale bed crushing device for measuring the gas content. The shale bed crushing device comprises a sealed crushing box body. A driving motor is arranged on the upper end faceof a base foundation plate. An output shaft of the driving motor is provided with an incomplete bevel gear, wherein the incomplete bevel gear is alternately engaged with a double-faced bevel gear anda rotating bevel gear. A transmission transverse shaft is connected with one end of a transverse screw rod through a transmission mechanism. A circular-truncated-cone-shaped annular side plate is arranged at the side edge of the lower end face of a filter stop mesh plate. A rotating grinding mesh plate is arranged at the inner side of the circular-truncated-cone-shaped annular side plate. A rotating vertical shaft is arranged on the lower end face of the rotating grinding mesh plate, wherein the rotating vertical shaft vertically penetrates the bottom wall of the sealed crushing box body. Thelower end of the rotating vertical shaft is provided with a transmission bevel gear, wherein the transmission bevel gear is engaged with the double-faced bevel gear. The lower end face of the filterstop mesh plate is provided with grinding protrusions. The shale bed crushing device is simple in structure; shale can be crushed and ground multiple times, and it is guaranteed that the shale is completely crushed; furthermore, it is guaranteed that shale gas is completely emitted; and the shale bed crushing device is easy and convenient to operate, convenient and fast to use and high in practicability.

The invention relates to a basin-type insulator mounting assembly for tests. The basin-type insulator mounting assembly for the tests includes at least two basin-type insulators, mounting flanges arearranged on the basin edges of the basin-type insulators, the two sides of each basin-type insulator are correspondingly provided with test barrels, each test barrel includes a barrel body and a barrel flange which is used for being fixedly connected with the corresponding mounting flange, the barrel flanges on the concave face side of the basin-type insulators are named as first barrel flanges, and the barrel flanges on the convex face side of the basin-type insulators are named as second barrel flanges, and elastic parts are mounted between the barrel flanges and the mounting flanges and / orbetween the second barrel flanges and the first barrel flanges and the second barrel flanges through pushing, and are used for applying elastic force in the axial direction of the basin-type insulators. According to the basin-type insulator mounting assembly for the tests, through cooperation of fastening bolts and elastic parts, the basin-type insulators and the barrel bodies are fixed, the structure is simple, operation is convenient, and the mounting efficiency is greatly improved.

The invention belongs to the technical field of livestock raising equipment, and particularly relates to a holding electronic cage scale for live pigs. The dynamic mass of a boar or other pigs can be accurately obtained, and the fat thickness, the eye muscle height, the eye muscle area and the like of each live pig such as the boar are conveniently measured by the aid of B-type ultrasonic technology. The holding electronic cage scale comprises a weighing outer cage and a weighing inner cage, the boar and the like enter the weighing inner cage after sensors are calibrated, the boar is held in a resting state in the weighing inner cage by adjusting the height of a lifting table, and the weight of the boar and the live pigs are ultrasonically measured. By the aid of a weighing sensor, a data acquisition unit and the lifting table arranged in the weighing inner cage, the boar and the like can be effectively prevented from substantially moving, lying and sitting up in the weighing process, weighing inaccuracy caused by movement of the boar and the like is avoided, data acquisition accuracy and realness are improved, live ultrasonic measurement is conveniently, effectively and simply realized once, and live pig measuring accuracy and efficiency are greatly improved.

The invention discloses a road surface slope gradient detection device which comprises a bottom plate, a detection unit, a replacement unit, a fixing frame and a push handle; a fixing frame is arranged at the top end of the bottom plate, a push handle is arranged on the right side of the top end of the bottom plate, a cleaning unit is arranged on the front side of the top end of the bottom plate,and a shading unit is arranged at the top end of the fixing frame. The detection unit comprises a connecting plate, a rotating shaft, a fixed block, a T-shaped block, a pointer, a supporting rod and adial, the connecting plate is arranged at the top end of the interior of the fixing frame; the front side surface of the connecting plate is rotationally connected with the rotating shaft; the fixedblock is arranged at the front end of the rotating shaft; a T-shaped groove in the bottom end of the front side face of the fixed block is matched with the T-shaped block, the pointer is arranged at the bottom end of the T-shaped block, the supporting rod is arranged on the rear side face of the dial, and the left end and the right end of the supporting rod are connected with the left side and theright side of the interior of the fixing frame correspondingly. The road surface slope gradient detection device is simple to use and easy to move, has various functions and good detection effect.

The invention discloses a method for detecting phosphorus content in metallurgy raw materials. According to the method, bismuth nitrate, ascorbic acid and hydroxylamine hydrochloride are prepared into a mixed reducing agent through uniform sample weighing amounts; and ammonium molybdate, potassium sodium tartrate and ethanol are prepared into a mixed developing solution, and bismuth phosphorus molybdenum blue ternary heteropoly acid is generated. A phenomenon that the reducibility of ascorbic acid is strong so that other ion inferences are caused is avoided and the stability of the reducing agent is enhanced; the mixed reducing agent and the mixed developing solution can be added reversely; and the content can be determined by one calibration curve through quantitative dilution of a high-content analyzing section. By virtue of the method, the content of the phosphorus in the metallurgy raw materials can be accurately determined; and according to the method, the steps are simple in steps, the operation is convenient, and the analysis requirements on phosphorus in a production process can be met.

The invention discloses a gas pressure measuring system for a mining-induced fracture field of a coal seam. The gas pressure measuring system comprises an exploration and collection device, a pluggingdevice and a measuring device. The exploration and collection device is installed in a borehole, and the plugging device is used for sealing the borehole. The exploration and collection device comprises a first pipe body, a second pipe body and a third pipe body, wherein the third pipe body extends into the bottom of the borehole, and the first tube body is located on the outermost side of the borehole. The plugging device comprises a plugging capsule, a capsule connecting pipe and a capsule operating platform. The measuring device comprises a gas pressure gauge, an electronic pressure measuring instrument and a gas collecting analyzer, wherein the gas pressure gauge, the electronic pressure measuring instrument and the gas collecting analyzer are connected in sequence, wherein the gas pressure gauge is connected to the front portion of the first pipe body. According to the gas pressure measuring system for the mining-induced fracture field of the coal seam, the stress of a mining-induced fracture of the coal seam can be analyzed, an excavation position is marked, so that the formation stress and gas seepage pressure are calculated, thus the occurrence of coal mine gas dynamic disasters are effectively prevented, and the gas pressure data can be automatically and periodically recorded, stored and transmitted.

The invention provides a bacterium counting device. The bacterium counting device comprises a sampling assembly, a counting cell assembly and a circuit control system, wherein the sampling assembly isused for obtaining bacterium samples to be counted; the counting cell assembly comprises a jewel hole, a front cell, a rear cell and electrodes; the front cell and the rear cell communicate through the jewel hole, the electrodes are respectively arranged on two sides of the jewel hole, and liquid pressure between the front cell and the rear cell is negative pressure and is used for enabling the bacterium samples to be counted to enter the rear cell from the front cell through the jewel hole; and the circuit control system is used for detecting the number of bacteria in the bacterium samples to be counted according to pulse signals under the condition that pulse signals are generated on two sides of the jewel hole, and the pulse signals are used for indicating that the bacteria in the bacterium samples to be counted pass through the jewel hole.

The invention relates to an electronic belt scale nutation type belt tensioning device which comprises a tensioning framework, main body lateral plates and a link mechanism, wherein the tensioning framework is spanned over both ends of a driven roller of an electronic belt scale and is positioned between an upper belt and a lower belt, the main body lateral plates are symmetrically arranged at the two outer sides of the tensioning framework, the link mechanism is installed on the main body lateral plates, the link mechanism is formed by sequentially connecting pedestals, first connecting rods, second connecting rods and nutation plates, the pedestals are fixed on the main body lateral plates, the first connecting rods are articulated with the pedestals through first rotating shafts, the second connecting rods are articulated with the first connecting rods through second rotating shafts, and the nutation plates are respectively articulated with the second connecting rods through third rotating shafts and articulated with the main body lateral plates through fourth rotating shafts; fastening bolts are arranged on the nutation plates; wrenches are installed on the second connecting rods; and the nutation plates are also connected with the tensioning framework through first bearings, and the tensioning framework is connected with a central shaft of the driven roller through a second bearing. The electronic belt scale nutation type belt tensioning device has light structure and can rapidly realize the tensioning or relaxation of belts with labor saving, and the size of tensioning force can be accurately regulated in real time.

The invention discloses a reel speed regulating device of a high-speed winding machine. The device comprises a rack and a motor, a winding roller is rotationally arranged on the rack, the middle shaft part of the winding roller is connected with an output end of the motor, a rotating speed sensor and a winding diameter detector are arranged on the winding roller, the winding diameter detector detects the winding diameter of the winding roller, an output end of the belt motor is further connected with a speed changing device, the speed changing device is connected with a control terminal, and the control terminal is connected with the rotating speed sensor and the winding diameter detector. The winding diameter of the winding roller can be monitored in real time, the rotating speed of a winding shaft is adjusted in time, and the surface tension of materials is guaranteed.

The invention provides a material level detecting device for a pulverized coal bunker of a power system. The material level detecting device comprises a heavy hammer, a winding roller, a pulling rope,a dustproof sleeve sleeved on the pulling rope and a dustproof cavity, wherein the dustproof cavity is a conical cavity body, the bottom surface of the dustproof cavity body is further fixed to the top of the pulverized coal bunker; one end of the pulling rope is fixed to the winding roller, the other end is arranged inside the pulverized coal bunker through a first measuring port and a second measuring port, the heavy hammer is connected with the pulling rope, and a dustproof sleeve is further arranged at the first measuring port. The dustproof sleeve comprises a sliding sleeve and a buffercylinder arranged outside the sliding sleeve, the buffer cylinder comprises a first buffer cylinder, a spring and a second buffer cylinder, wherein both the spring and the second buffer cylinder are arranged inside the first buffer cylinder, the second buffer cylinder further comprises two semi-cylindrical buffer walls; the sliding sleeve is sleeved outside the pulling rope, and one end of the sliding sleeve is further arranged with an outer edge which is extending to the outside of the sliding sleeve. According to the material level detecting device for pulverized coal bunker of power system,the pulverized coal will not be leaked from the pulverized coal bunker during the material level measuring process, so that resource conservation and storage environmental protection are achieved.

The invention relates to a blending device and a blending method of H2O2, wherein the H2O2 blending device comprises a raw liquid pre-treatment pot, a H2O2 blending main pot, and a first pump arranged therebetween. A first pipeline connects the first pump to the H2O2 blending main pot. A first on / off valve is arranged on the first pipeline. A second pipeline connects the raw liquid pre-treatment pot to the first pump. A third pipeline, which is connected to the raw liquid pre-treatment pot, is arranged on the pipeline connected between the first on / off valve and the first pump. A second on / off valve is arranged on the third pipeline. A first exhaust hole is formed on the upper end of the raw liquid pre-treatment pot. According to the blending device and the blending method of H2O2, the H2O2 raw liquid pumped into the H2O2 blending main pot is firstly subjected to initial exhaust circulation, thereby effectively exhausting the gas generated due to instability of the H2O2 raw liquid and avoiding the influence on metering of the H2O2 raw liquid during blending process so as to prepare a H2O2 liquid in stable concentration.

The invention provides an explosive vibration mixing process stimulus testing system. The system comprises a CYLINDRICAL MIXING CONTAINER, a vertical column which is suspended in the mixing container;a first sensor installed on the bottom surface of the mixing container, a second sensor installed on the side surface of the mixing container, a third sensor installed on a vertical column and havinga test surface normal perpendicular to the horizontal plane, a fourth sensor installed on the vertical column and having a test surface normal parallel to the horizontal plane, an electrostatic isobaric surface and an electrostatic voltage tester. The system can provide a force, heat and static stimulation quantity testing system for the explosive vibration mixing process, and provides a basis for safety evaluation of the explosive vibration mixing process; measurement of the temperature, the internal impact force, the inertia force and the internal electrostatic voltage of the wall surface of the mixing container and the mixed material can be realized.

The invention relates to a high-precision differential pressure type liquid level measurement device and application thereof. The measurement device comprises a container requiring liquid level measurement, a transmitter, a positive-pressure chamber pressure guide pipe and a negative-pressure chamber pressure guide pipe. A positive-pressure chamber of the transmitter is communicated with a lower end of the container requiring liquid level measurement through the positive-pressure chamber pressure guide pipe, and a negative-pressure chamber of the transmitter is communicated with a high end of the container requiring liquid level measurement through the negative-pressure chamber pressure guide pipe. The highest end of the negative-pressure chamber pressure guide pipe is externally connected with a negative-pressure chamber liquid injection pipe, the highest end of the positive-pressure chamber pressure guide pipe is externally connected with a positive-pressure chamber liquid injection pipe, and each of the negative-pressure chamber liquid injection pipe and the positive-pressure chamber liquid injection pipe is provided with a plug or a check valve. Before use of the measurement device, the positive-pressure chamber, the negative-pressure chamber, the positive-pressure chamber pressure guide pipe and the negative-pressure chamber pressure guide pipe are filled with a to-be-tested liquid medium through the negative-pressure chamber liquid injection pipe and the positive-pressure chamber liquid injection pipe. Compared with the prior art, the high-precision differential pressure type liquid level measurement device has advantages that influences on measurement accuracy due to backflow of the positive-pressure chamber pressure guide pipe can be counteracted, and accordingly influences on instrument measurement due to technical production fluctuation can be counteracted.

The invention relates to a method for treating dye wastewater by a Fe<0> / PDS system. In order to overcome the defects in the process of activating PDS (persulfate) by Fe<2+>, Fe<0> is used as a sourceof Fe<2+>, so that the reaction of the PDS is indirectly realized. Regardless of aerobiotic / anaerobic conditions, the conversion from the Fe<0> to the Fe<2+> can be realized. The degradation rate oncontaminants is favorably improved. Through an Fe<0> activation system, the degradation on the contaminants can be improved; a heterogeneous system built by the Fe<0> cannot cause the condition that agreat number of iron ions are dissolved in a water body to cause secondary pollution; the Fe<0> can be filtered, recovered and reutilized; the wastewater treatment cost can be reduced.

The invention discloses a pressure taking device for steam pocket pressure measurement. The device (1) comprises a main body part (E), a conduit part and an exhausting screwed plug (D), wherein the device is connected with a pressure transmitter film box (3) through a pressure guide pipe (2); the conduit part is divided into a first conduit (A), a second conduit (B) and a third conduit (C) which are connected with the bottom part, the side part and the top part of the main body part (E) respectively and extend into the main body part (E); the first conduit (A) is connected with a steam pocket (4) through a steam pocket pressure-taking root valve (5); the second conduit (B) is connected with the pressure guide pipe (2); an instrument needle valve is arranged on the third conduit (C); and the exhausting screwed plug (D) is in threaded connection with the main body part (E). The device has a simple structure, is convenient to mount and use, and greatly prolongs the service life of a pressure transmitter.

The invention provides a persulfate activating method. A homogeneous system is generally adopted for common transition metal activation, secondary pollution is prone to being caused due to the fact that metal ions are dissolved in water, meanwhile, the catalysis activity of the homogenous system is largely affected by pH values, and the homogenous system cannot be recycled and has potential toxicity. Fe3O4 which is a non-homogenous Fenton reaction catalyst excellent in performance is adopted, activation of persulfate and degradation of pollutants occur on the surface of the Fe3O4, contact between generated SO4<->. and Fe<2+> in the Fe3O4 can be effectively reduced, the probability of side reaction is lowered, and it is ensured that the utilization rate of persulfate is high; and secondarypollution caused by a large amount of iron ions dissolved in water is avoided.