136results about How to "Structure has no effect" patented technology

The invention discloses a concrete static force cutting dismantling construction method which mainly comprises the steps of construction equipment selection, cutting unit division, supporting scaffold erection, hoisting auxiliary facility installation, cutting construction, component hoisting and site cleaning. The concrete static force cutting dismantling construction method has the obvious advantages that the effect on the surrounding structures is small in the process of constructing, the constructing speed, the constructing precision and the safety are high, and components which are cut through the static force are convenient to clean. The concrete static force cutting dismantling construction method is suitable for dismantling various reinforced concrete members, and especially for dismantling the part structures with the high demand for dismantling and with the small effect on an original structure. Time and production cost are greatly saved, and the construction period is effectively shortened.

The invention relates to a secondary lithium ion battery positive active material with the surface coated with Li2O-2B2O3 as well as a preparation method thereof designed for solving the technical problem of electrochemical stability of the existing secondary lithium ion battery under high temperature. The positive active material has the design points: the transition metal lithium oxide particle positive active substance with the surface coated with Li2O-2B2O3, a conductive agent and a binder are present in weight percentages of: 96 to 10 percent, 2 to 5 percent, and 2 to 5 percent respectively. The preparation method comprises: LiOH-H2O, H3BO3 and transition metal oxides are under ball-mill mixing in a certain proportion, wherein, LiOH-H2O and H3BO3 are present in a molar ratio of 1: 2-1: 1, and the secondary calcination method is adopted to obtain a transition metal lithium oxide particle with the surface coated with Li2O-2B2O3. The surface physical and chemical characters of the positive active material are changed, and the preparation method is feasible and is applied to the development and application of similar products.

The invention relates to a method for separating and extracting protein in a biological product technology, in particular to a preparation method of human serum albumin. The preparation method comprises the following steps of: separating components I, II and III, separating a component IV, separating a component V, and refining and purifying; and performing ultrafiltration, pasteurization and sterilized filling, examining a finished product, and packaging the qualified product by pasting a label, boxing and the like. According to the preparation method disclosed by the invention, a relatively-moderate pressure-filtration separation method is adopted, so that the molecular structure of the protein is not influenced, and the human serum albumin with high quality is ensured to be prepared; moreover, the product yield is greatly increased, the human serum albumin which is low in aluminum ion content or even does not contain aluminum ions can be provided for clinical application, and the quality of the human serum albumin is improved.

The invention discloses a reflective optical fiber sensor device, which comprises a light source, an optical detector and a sensor probe, wherein the sensor probe is used for receiving and processing the incident light emitted by the light source and sending the obtained reflected light to the optical detector. The reflective optical fiber sensor device can overcome the defects that the sensor in the prior art has large volume, cannot be used in an environment with electromagnetic interference and has short service life and poor corrosion resistance, and has the advantages of small volume, wide application range, long service life and good corrosion resistance.

The invention relates to a vibration knocking device and a mining dump vehicle. The vibration knocking device comprises a base, a vibration rod, a support, an impact ball A and an impact ball B, wherein the support is arranged on the base, and the impact ball A and the impact ball B are installed at the two ends of the vibration rod. The impact ball A and the impact ball B are each made of metal. The vibration rod is installed on the support and can freely swing around the support. An electromagnet A is arranged below the impact ball A. An electromagnet B is arranged below the impact ball B. By means of the interrupted power supply between the electromagnet A and the electromagnet B, the impact balls can swing in a reciprocating manner. The mining dump vehicle comprises a platform floor. The vibration knocking device is installed on the platform floor. By means of the vibration knocking device and the mining dump vehicle, residual materials adhering to the platform floor can be removed in the one-time discharge process, the vibration knocking device can adapt to different materials by regulating the vibration knocking frequency, the structure is simple, and installation is convenient.

The invention discloses a method for assisting brazing by a carbon nanotube reinforced type three-dimensional middle layer, and relates to a method for brazing ceramic and metal, which aims at solving the problems of larger residual stress and insufficient high-temperature property in the existing ceramic and metal brazing connection process. The method comprises the following steps of 1, preparing soaked foam metal; 2, putting the soaked foam metal into a plasma reinforced type chemical vapor depositing vacuum device, and increasing temperature at certain pressure and hydrogen atmosphere; 3, preparing nanotube reinforced type foam metal; 4, preparing surface impurity-removed metal, surface impurity-removed brazing material foil and surface impurity-removed ceramic; 5, sequentially overlapping the surface impurity-removed to-be-brazed metal, the carbon nanotube reinforced type foam metal, the surface impurity-removed brazing material foil and the surface impurity-removed ceramic, so as to obtain a to-be-brazed part; brazing the to-be-brazed part, and cooling to room temperature. The method disclosed by the invention is used for assisting the brazing by the carbon nanotube reinforced type three-dimensional middle layer.

The invention relates to an integrated substrate wave-guide bandpass filter based on a triangular complementary split-ring resonator. The integrated substrate wave-guide bandpass filter comprises a resonant cavity in equilateral triangle, the resonant cavity is composed of an upper surface metal layer, a medium substrate and a lower surface metal grounding plate stacked in order; the upper metal layer is communicated with the lower surface metal grounding plate through the bottom metal column after penetrating the medium substrate; and a triangular complementary split-ring resonator is arranged at a center location of the upper surface metal layer, wherein the triangular complementary split-ring resonator is loaded in a pair of triangular resonant cavities in a degenerate mode, the complementary split-ring resonant can product a passband, the produced passband is modulated to a pair of degenerate modes by regulating the parameter of the ring resonator, thereby improving the bandwidth of the filter. The transmission zero point of the bandpass filter can be further adjusted by opening a round interference metal hole in the resonant cavity, thereby effectively inhibiting the out-of-band harmonic. The bandpass filter disclosed by the invention is not only simple in structure, convenient for processing, but also can effectively inhibit the out-of-band harmonic since the transmissionzero-points are coexistent in the low-frequency end and the high-frequency end, the high frequency selectivity and excellent performance are provided.

The invention relates to a real-time monitoring system and a real-time monitoring method of a condensing state of concrete and in particular relates to the real-time monitoring system used for determining the condensing time of the concrete according to change of a collected pressure value of a monitoring point location in a pouring process of the concrete. The real-time monitoring system comprises a monitor and a central processing unit connected with the monitor, wherein the monitor is arranged in a pouring template and connected with the central processing unit outside the pouring template by virtue of a signal transmission cable. By adopting the design of the monitor, the pressure value of the monitoring point location can be synchronously collected in real time. In addition, the monitor is small, exquisite and convenient and simple in setting and does not have effect on the structure of the concrete. By utilizing the real-time monitoring system, the measurement step is simplified, the construction process is accelerated, the construction cost is saved, and the work efficiency is improved.

An inclination sensing type storage tank liquid level intelligent detection method is achieved through an inclination sensing type liquid level meter, an inclination sensor module, a temperature compensation module, an MCU processor module, a collection processing module and a data remote transmission module. A mechanical floating ball pointer is used as a working mechanism of the liquid level meter, an inclination sensing type liquid level meter pointer is used for measuring rotating angles, the processor module collects and processes each electrical signal converted from a pointer inclination, the liquid level and the volume of a storage tank are worked out according to corresponding relation of each angle and one liquid level and through correction of data by a temperature collecting module, and liquid level and volume data are output in a remote transmission mode through electrical signals and digital signals. For a remote storage tank without power supply, the inclination sensing type liquid level meter is provided with a solar panel and a storage battery power supply module, wireless networks such as CDMA or 3G or GPRS are used for remote transmission of data.

The invention provides a dustproof mesh enclosure for a radiator. A dustproof mesh capable of being unfolded for shielding or being folded to stack is arranged in front of the air inlet of the radiator, and a pulley and a reversing wheel are arranged through a fixing plate; a motor control box drives a winch deploying and retracting steel wire rope to control the dustproof mesh to unfold upwards or fold downwards along a U-shaped guide groove; the dustproof mesh stops dust, grass clippings, poplar catkins, insects and other debris, thereby reducing the adsorption and accumulation of the debris through radiator fins of a transformer to make a heat sink network be unimpeded and improve the heat dissipation effect of the radiator; the dustproof mesh enclosure of the radiator can be folded and unfolded, so that disassembly and assembly and cleaning maintenance can be easily conducted; the dustproof mesh of the radiator adopts an assembling structure, and the installation is convenient and simple; the installation mode of the dustproof mesh enclosure of the radiator adopts a special C-shaped clamp which is fixedly connected with the radiator, and the original radiator structure is not changed, so that the process of installation needs no punching or welding, and has no influence on the original component structure of the radiator.

An excitation fuse integrated with an arc extinguishing melt comprises an upper shell and a lower shell which are successively arranged from top to bottom. A conductive plate is arranged between the upper shell and the lower shell. An accommodating cavity with a downward opening is arranged in the upper shell, and the accommodating cavity with an upward opening is arranged in the lower shell. An ignition explosion device and a piston are successively arranged in the accommodating cavity of the upper shell from top to bottom. The accommodating cavity of the lower shell is filled with an arc extinguishing medium. A sealing element for sealing the arc extinguishing medium is arranged in the accommodating cavity of the lower shell. The sealing element is provided with the accommodating cavitywhich is provided with the upward opening and is used for making the conductive plate fall off after disconnection. The melt is arranged in the arc extinguishing medium, and two ends of the melt passthrough the upper end surface of the lower shell and are connected with a bottom of the conductive plate in parallel. A disconnected part of the conductive plate after being impacted and disconnectedby the piston is located between connection parts of the two ends of the melt and the conductive plate. The fuse has advantages that influences of air pressure, temperature and humidity on the fuse are small, reliable breaking can be achieved under various working conditions, and a breaking capacity is high.

The invention discloses a regulating stem type anti-falling device for human body to climb up and down an electric pole, which is provided with a wiring sleeve. The anti-falling device comprises a regulating stem, a self-locking hook, a safety rope, the wiring sleeve and a connector, wherein the upper end of the regulating stem is fixed with the connector; the lower end of the connector is provided with a connecting hole or a U-shaped ring and the upper end of the connector is provided with a U-shaped ring or a connecting hole; two arms of the U-shaped ring are provided with bolt fastening holes; bolts are detachably locked into the bolt fastening holes; the safety rope is fixed on the lower end of the connector; the wiring sleeve is fixed on the upper end of the connector; the self-locking hook is locked on the safety rope; and a fixed ring of the self-locking hook is connected with a short safety rope the other end of which is connected with a front hanging point of a whole-body safety belt. The regulating stem type anti-falling device is carried and used by workers without any device in advance on the electric pole, has no influence on the structure of an electric pole body, has the characteristics of convenient storage, maintenance and carrying, easy use, simple maintenance, low cost and high safety, can be put into application in large scale, has low investment and quickly obtained benefit, and improves the work efficiency.

The invention discloses a lithium supplementing current collector which comprises a metal foil and a lithium supplementing layer loaded on the metal foil. The lithium supplementing layer comprises conductive carbon, a lithium-containing additive, a first polymer and / or a derivative thereof, and a second polymer and / or a derivative thereof. The first polymer is selected from any one or more of polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polystyrene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy resin and phenolic resin, and the second polymer is polytetrafluoroethylene. The invention also discloses a preparation method of the lithium supplementing current collector, and the method comprises the following steps of placing lithium-supplementing slurry between the preheated rollers of a roller press for rolling to obtain a self-supporting lithium-supplementing coating, the preheating temperature of the rollers being 50-150 DEG C; placing the self-supporting lithium-supplementing coating on the metal foil, and carrying out hot-pressing compounding between the preheated rollers. The invention also discloses a negative plate. The invention also discloses a lithium battery.

The invention relates to a piezoelectric energy collection device and an application and method on a floating slab track. The piezoelectric energy collection device comprises an upper cover plate anda lower cover plate, a central block is arranged at the central position between the upper cover plate and the lower cover plate, a plurality of groups of piezoelectric ceramic stacks which are distributed in central symmetry by taking the central block as a center and are distributed along the radial direction are arranged between the upper cover plate and the lower cover plate, one ends of the piezoelectric ceramic stacks are supported on the central block, the other ends are supported on a pushing and pressing device for converting vertical pressure of the upper cover plate and the lower cover plate into radial horizontal thrust, and the floating slab track comprises the piezoelectric energy collecting device arranged in a steel spring vibration isolator. The invention comprises the piezoelectric energy collecting device which is high in bearing capacity, high in output power and low in vertical size. In addition, the piezoelectric energy collecting device is applied to the floatingslab track to form a floating slab track which can provide stable energy and has a safety protection function. The invention further provides a design method of the piezoelectric energy collecting device.

The invention discloses a stuffing sand removing method for casting start of a continuous casting steel ladle. A movable flow guiding chute is arranged in a space between the lower side of a protective sleeve rising to a high position and the upper edge of an intermediate tank; the continuous casting steel ladle rises to a high position and directly rotates to a casting station from a molten steelreceiving station, after casting is prepared well and the protective sleeve is installed, the flow guiding chute moves to a work station under the protective sleeve, a sliding nozzle is opened, and stuffing sand flows into the flow guiding chute and is guided into an overflowing opening on the intermediate tank or directly guided into an overflowing tank outside the intermediate tank; after all the stuffing sand is guided away and the molten steel flows out, the flow guiding chute is moved to the waiting station, where the flow guiding chute does not influence hoisting of the intermediate tank, outside the intermediate tank, the molten steel flows into the intermediate tank, the continuous casting steel ladle descends to a low position, the protective sleeve dips into the molten steel inthe intermediate tank, and casting start is completed. The stuffing sand removing method for casting start of the continuous casting steel ladle does not need stop, does not influence the existing steel ladle casting start preparation procedure and does not prolong the overall casting start time, and a good removing effect is achieved.

The invention relates to a line laser non-scanning automobile anti-collision radar which is composed of a transmitting end, a receiving end and a control system.The transmitting end comprises a laser device, a collimation lens and a cylindrical lens.The transmitting end is fixed to an automobile, and a laser is transformed into a line beam through the cylindrical lens and irradiates the part in front of the automobile.The receiving end comprises a focusing lens and an area array CCD, and the receiving end is fixed to the top of the automobile through a support.A target reflecting signal is focused on the area array CCD through the focusing lens, a line image is formed on the photosensitive face of the area array CCD, and the signal is collected by a micro-type computer and processed to generate a target distance image.The line laser non-scanning automobile anti-collision radar is simple in structure, easy to process and debug, low in production cost and easy to operate; combining with the processing method of threshold value filtering and extreme value extracting, high-resolution and high-sensitivity obstacle detection can be achieved, and the line laser non-scanning automobile anti-collision radar is suitable for real-time automobile anti-collision.

The invention relates to an Ethernet MAC module realization device and an Ethernet MAC module realization method used for IEEE 1588v2 protocol. The Ethernet MAC module realization device comprises aMAC receiving module and a MAC transmitting module. The MAC receiving module is used for receiving of all Ethernet messages, and is realized on an FPGA or an ASIC. The MAC transmitting module is for the transmitting of all Ethernet messages, and is also used to return the transmitting time stamps of the Ethernet messages to a PTP protocol stack. The MAC transmitting module is formed by a softwareprogram and a hardware logic. The software program of the MAC transmitting module is installed on a CPU or DSP platform, and is used for PTP time stamp related auxiliary computation and MAC part control function. The hardware logic of the MAC transmitting module can be realized on the FPGA or the ASIC, and is used for PTP time stamp processing, time stamp related part real-time computation, and MAC layer protocol realization. Exchange between the MAC receiving module and the PTP protocol stack, the exchange between the MAC transmitting module and the PTP protocol stack, and the exchange between the software program and the hardware logic of the MAC transmitting module are reduced, and the mutual exchange is required to wait.

The invention discloses an adsorbing material with water-induced shape memory function, and a preparation method and an application thereof. The adsorbing material is prepared by performing physical cross-linking gelation in an aqueous solution system with a tape casting method, wherein a porous aqueous solution system is prepared from the following components in parts by weight: 10-20 parts of functional polymer material containing amino functional group, 10-20 parts of water-soluble high-molecular polymer containing polyhydroxy / carboxyl / amino, 0.5-10 parts of microorganism and 0.01-10 parts of a nutrient solution. The preparation method is simple in operation and low in cost; the raw materials are easily acquired; the prepared material has an excellent adsorbing property and can realize non-irritant quick response in deionized water at normal temperature; the material is endowed with excellent mechanical property and shape memory function; the performance shows certain recycling possibility.

The invention discloses a preparing method for hyaluronic acid or salt particles of the hyaluronic acid and an obtained product. The hyaluronic acid particle preparing method is a dry process granulation method, the hyaluronic acid or salt powder of the hyaluronic acid is subjected to rolling, pulverizing, fine granulating, screening and discharging through a dry process rolling and granulating method under the situation that a bonding agent is not used, and the hyaluronic acid or salt particles of the hyaluronic acid are obtained. The product has the characteristics of being high in stackingdensity, weak in hygroscopicity, good in mobility and stability and the like; and in the usage process, the advantages that dissolving is easy, adding is convenient, dust waste and pollution are reduced, long-term storage is achieved, and the transportation powdering ratio is low. According to the preparing method, operation is simple, little equipment is needed, a bonding agent and ingredients donot need to be added, influences on the structure and the property of the hyaluronic acid or the salt of the hyaluronic acid are avoided, and industrial production can be achieved.

The present invention relates to a method for separating and extracting protein in biological product technology, in particular to a method for preparing human serum albumin. Ⅴ. Refining and purification; ultrafiltration, pasteurization, sterilizing filling, inspection of finished products, labeling and boxing of products that pass the inspection, etc. for packaging. The invention adopts a relatively mild pressure filtration separation method, which has no effect on the protein molecular structure, ensures the preparation of high-quality human serum albumin; greatly improves the product yield, and can provide low aluminum ion content or even no aluminum ion to the clinic. Aluminum ions in human serum albumin improve the quality of human serum albumin.

A stacked three-dimensional wind-driven power generator is characterized in that a horizontal-shaft wind-driven power generator is disposed on a tower cylinder, and the shaft end of the horizontal-shaft wind-driven power generator is fixedly connected with the blades of the horizontal-shaft wind-driven power generator; the tower cylinder is fixedly connected with a vertical-shaft power generator support cylinder seat through upper and lower support rings disposed between the outer wall of the tower cylinder and the cylinder inner wall of the vertical-shaft power generator support cylinder seat, the upper-end and lower-end outer walls of the cylinder of the vertical-shaft power generator support cylinder seat are hinged to a rotation outer cylinder through thrust bearings, the blades of a vertical-shaft wind-driven power generator are fixed at the upper and lower ends of the rotation outer cylinder through evenly-distributed and fixedly-connected support rods, an upper cover plate is fixedly connected with the upper end of the rotation outer cylinder, a driven gear and the rotor of the vertical-shaft wind-driven power generator which are coaxially and fixedly connected are mounted at the upper and lower ends of the vertical-shaft wind-driven power generator support cylinder seat through bearings, and the inner drive teeth disposed at the upper and lower ends of the rotation outer cylinder are meshed with the driven gear; a brake device is disposed between the cylinder wall of the vertical-shaft wind-driven power generator support cylinder seat and the inner wall of the rotation outer cylinder.

The invention discloses a plugging injection mix for air leakage of a furnace bottom foundation of a hot-blast stove. The injecting mix comprises the following components by mass percentage: 40-50% ofa special grade high alumina bauxite granular material; 25-35% of special grade high alumina bauxite powder; 2-4% of active alpha-alumina micro powder; 2-4% of active silica micro powder; 0.05-0.5% of a dispersant; 19-25% of furan resin; and 1-3% of a curing agent. The injecting mix has the characteristics of easy mechanized construction, good fluidity, short construction time, strong bonding performance, curing at room temperature, high strength after curing, good volume stability and the like, can effectively improve the problems such as shrinkage cracking, great brittleness and the like existing in the existing online repair method, and has important industrialization and promotion values.

The invention relates to a vision-based trackless electric door running control method, device and system. The method comprises the steps of S1, acquiring a current image, collected by an image acquisition device, of an electric door in the moving direction; S2, extracting current features of the current image through a preset method, comparing the extracted current features of the current image with prestored features to judge whether the current features are matched with the prestored features or not, if yes, executing the step S4, and if not, executing the step S3; S3, outputting a controlsinal to control the electric door to stop; S4, conducting analytical processing on the current image and acquiring skewing information of a machine head of the electric door through combination withmotion information of the machine head of the electric door; and S5, controlling the electric door to operate according to the skewing information to the machine head. Through the method, traditionalmagnetic nails or guide rails can be effectively omitted; an obstacle can be accurately avoided without an additional infrared sensor, navigation of the electric door can be more accurately realized,and the electric door is effectively prevented from skewing.

The invention discloses a two-way automatic centering fixture, and relates to the field of mechanical machining, in particular to the two-way automatic centering fixture. The two-way automatic centering fixture comprises two clamping vice jaws arranged on a workbench and is characterized in that one far end of the two clamping vice jaws is connected with a clamping wheel of a machine tool, and the other far end of the two clamping vice jaws is connected with the wall of the machine tool through a tension spring; two deflector rods are arranged at the two clamping vice jaws correspondingly, one end of each deflector rod is connected with the corresponding clamping vice jaw through a pin shaft, and the other end of each deflector rod is connected with a corresponding gear; the deflector rods can drive the gears to rotate, and the two gears are engaged with each other. According to the two-way automatic centering fixture, the structure is simple, the requirement for machining precision of the fixture is not high, and action is flexible and reliable; an existing power source of the machine tool is utilized, the main structure of the machine tool is not influenced, the manufacturing period is shortened, and the cost is low.

The invention relates to a low-temperature dyeing method for high-performance fabric, and belongs to the technical field of textile printing and dyeing. According to the method, silicic acid gel generated by hydrolyzing sodium silicate is adopted in the dyeing process of the high-performance fabric. N,N-dimethylacetamide is enriched in the silicic acid gel which is adsorbed on the fiber surface ofthe fabric. At 50-70 DEG C, N,N-dimethylacetamide opens part of hydrogen bonds between macromolecules on the surface of the high-performance fiber, and surface roughness and porosity of the fiber areincreased; then under the action of sodium hydroxide, the silicic acid gel adsorbed on the surface of the high-performance fabric is dissolved, and N,N-dimethylacetamide is released. Under the condition of low temperature dyeing at 70-90 DEG C, N,N-dimethylacetamide has strong polarity, and can effectively increase dissolution concentration of dye and reduce micelle concentration. Dye molecules are easily adsorbed and dye the high-performance fabric, and dyeing efficiency of the high-performance fabric is effectively improved. Besides, better dyeing effect can be achieved with the method at relatively low dyeing temperature, and thus, production cost and energy consumption are reduced.

In the seat belt retractor (10), the gear box (70) rotatably supports the other end of the shaft (162) of the locking pawl (160), and is fixed to the frame (12) by engaging pins (182, 184). superior. That is, the engagement pin (182) is matched with the engagement hole (186) of the foot plate (16), and the engagement pin (184) is on the side opposite to the side where the engagement pin (182) is placed on the sliding track of the tooth bar (68). , fits into the engaging hole (188), and is positioned to move more in the sliding direction of the rack gear (68) than the engaging pin (182). According to the seat belt retractor (10), even if the gear case (70) attempts to move relative to the foot plate (16), the engagement pins (182, 184) resist it, thereby preventing the gear case (70) from moving. That is, it is possible to suppress or prevent a change in the support position of a specific component that is provided in the vicinity of the sliding track of the slider of the pretensioner.

The invention relates to a preparation method of a platinum-diamond nanocomposite electrode, and is characterized by solving the problem on dispersity of diamond nano-particles in the form of in-situ modification. Further functionalized modification is performed on the diamond nano-particles to obtain a composite material with excellent catalytic performances and advantages of a diamond electrode, to further prepare a modified electrode. According to the preparation method of the platinum-diamond nanocomposite electrode disclosed by the invention, not only preparation means of the diamond nano-particles are expanded, but also the problem on the dispersity of the diamond nano-particles is solved in the form of in-situ modification; and wide application of nano-diamond in catalization, electrochemical sensing and like fields is greatly promoted.

A disclosed purifying method for hepatitis B e antigen comprises the following steps: transferring a recombinant plasmid of hepatitis B e antigen gene to a bacterium for obtaining a recombinant bacterium, wherein the 5' end and the 3' end of the hepatitis B e antigen gene are both connected with a poly-histidine encoding gene; adding an inducer for culturing the recombinant bacterium; performing lysis on the recombinant bacteria, and centrifuging the lysate; contacting an immobilized metal-chelated affinity chromatography medium with a supernatant obtained by centrifugation or with a precipitate solution prepared from a precipitate obtained by performing high-concentration denaturant dissolving and centrifugation under the condition that the poly-histidine fusion hepatitis B e antigen is allowed to combine the medium or to be absorbed by the medium; and selectively eluting poly-histidine fusion hepatitis B e antigen from the medium. According to the method, fusion tag technology and affinity chromatography are combined, the operation is simple and convenient; and by taking poly-histidine as a fusion tag, the structure of hepatitis B e antigen is not influenced.

The automatic oiling device of chain saw includes a chain saw casing, a motor, a saw chain guide plate, an oil storage case, a pneumatic feed tube communicated with the oil storage case, and an oiling pipe. The pneumatic feed tube set inside the chain saw casing has air inlet end set in the place near the blade of the motor and air outlet end communicated with the oil storage case via a non-return valve, and the oiling pipe has oil outlet end communicated with the oil hole in the saw chain guide plate. The present invention has reasonable configuration and capacity of maintaining clean outer appearance of the chain saw.

The invention discloses a plug and play integrated modular active harmonic isolator. The plug and play integrated modular active harmonic isolator comprises a current detection module, an inversion control module and a special transformer; the current detection module is used for detecting a fundamental current in the grid-entering current, and a feedback current which is generated by applying a voltage to the secondary side of the special transformer through an inverter; the special transformer comprises a primary side winding and a secondary side winding, wherein the primary side winding is used as a busbar to be connected to the power grid; the secondary side winding is wound in the axial direction, and is connected with the output end of the inversion control module; the input end of the inversion control module is connected with the direct current side voltage; the control end of the inversion control module is connected to the output end of the current detection module; and the inversion control module is used for outputting a control voltage for controlling the secondary side of the transformer to generate the feedback current according to a reference current signal. By adoption of the closed current transformer or open transformer access mode, simple access and no influence to the structure of the power grid are realized.