434results about How to "Not polluted" patented technology

The invention discloses an automatic spraying machine which comprises a machine frame, an operation panel used for inputting and displaying work signals, and a control cabinet, wherein a Y-axis guide rail is arranged on the machine frame; a Y-axis guide frame capable of sliding on the Y-axis guide rail forwards and backwards is arranged on the Y-axis guide rail; an X-axis guide rail is arranged on the Y-axis guide frame; an X-axis guide frame capable of moving on the X-axis guide rail horizontally is arranged on the X-axis guide rail; a Z-axis guide rail is arranged on the X-axis guide frame; a Z-axis guide frame capable of moving on the Z-axis guide rail up and down is arranged on the Z-axis guide rail; an oil can for containing a coating material is arranged on one side of the Z-axis guide frame; a nozzle for spraying is also arranged below the Z-axis guide frame and is communicated with the oil can; an air pipe used for spraying the coating material is also connected with the nozzle; a Y-axis driving device capable of driving the Y-axis guide frame to move forwards and backwards is also arranged on the machine frame; an X-axis driving device capable of driving the X-axis guide frame to move horizontally is also arranged on the Y-axis guide frame; and a Z-axis driving device capable of driving the Z-axis guide frame to move up and down is arranged on the Z-axis guide rail.

The invention relates to a swimming pool cleaning robot with orderly remote control, comprising a cleaning robot main machine, a power supply control box and a remote controller, wherein the cleaning robot main machine comprises a filter, machine housing components, an axial flow pump, a seal box, left and right transmission systems, clearer rollers and self-suspension cables; the left and right transmission systems respectively drive the front and rear cleaner rollers to rotate, thereby synchronously driving external teeth to contact the bottom of a wall of the pool so as to drive the robot to creep; sliding friction is generated between the outer edges of cleaning belts on the cleaner rollers and the bottom or the wall of the pool, thereby carrying out the operation of cleaning; an overload sensor is arranged in a control system of the cleaning robot and is used for detecting and judging the wall contact state during creeping cleaning, and corresponding signals are sent to cause the cleaning robot to be switched to a next program to work; and the remote controller has the functions of bidirectional communication, and a display screen can display working conditions and has the function of malfunction alarm. The robot carries out path planning design for the swimming pools with different shapes, and adopts the path method of entire journey back turning and the path method of half journey back turning, thereby realizing the orderly and full coverage cleaning of the swimming pools with different shapes.

The invention discloses an instrument for monitoring small particulate matters in air. The instrument is characterized in that small particle features of the small particulate matters in the air is monitored, and obtained electrical signals of the small particle features of the small particulate matters in the air to be monitored are processed and analyzed through a master control circuit, so as to judge the particle sizes of the small particulate matters in the air and further analyze the mass concentration and the particle number concentration of the small particulate matters. When the instrument is used for monitoring the air, the air to be monitored is diluted through introducing clean dry gas into a main gas path, so that mutual influence of the particulate matters, which is caused by overlap, is avoided, and the signal to noise ratios of the collected signals are increased; and besides, clean dry gas is introduced into a sensor, so that a circle of protection is formed on the periphery of the air to be monitored, and parts such as a light source, and the like in the sensor cannot be polluted by the air to be monitored.

The invention relates to a method for making landscape plant waste compost inoculum and an application of the same. The method is as follows: bacillus subtilis, trichoderma viride, lactobacillus plantarum, paracoccus denitrification, aspergillus oryzae and saccharomyces cerevisiae respectively occupying 10 to 20 mass portions are inoculated in a solid state fermentation medium so as to carry out cultivation and fermentation in dark sealing for 1 to 3 weeks at a temperature of between 25 and 30 DEG C; one week later, 250 mass portions of saw dust is added and evenly stirred and then cultivation and fermentation are continued; two weeks later, hay is placed to absorb surplus moisture and then is removed, and powdery inoculum can be obtained through drying in the shade for further use. Garden wastes are piled up and then are inoculated with inoculum with the weight occupying 1 to 3 per mill of that of a pile and dipped in warm water at a temperature of between 30 and 40 DEG C; compost is carried out at a temperature of between 55 and 65 DEG C, and pile turning and water replenishing are carried out every 3 to 4 days; then, pile turning and water replenishing are carried out every two weeks so as to keep pile water content of between 50 and 60 percent; thus, compost is completed after three weeks so as to reach to rotten innocuity standards. The strain has simple making and low cost, and can be directly used or bred continuously; moreover, the strain has no variation, no inactivation and long storage period, and the obtained compost can improve soil and increase nutrient utilization rate.

A thermal pouring valve for the beverage pouring production line based on the principle of gravitational pouring and negative-pressure reverse flow is composed of the liquid inlet tube jointer and valve body on the valve installing plate, the controller on said liquid inlet tube jointer, air returning tube jointer in the through hole on valve body, valve sleeve sleeving on the material inlet tube, spring sleeving on the lower part of material inlet tube and fixed to valve sleeve, sealing pad under the valve sleeve, reflux channel outside the material inlet tube, and a reflux hole on the valve body for connecting negative-pressure source.

The invention discloses a sterile filling valve applied to a sterile cold filling production line of beverage products. The filling valve comprises a material flowing cavity channel, and a valve opening and closing device is combined with a valve body into a whole, and the valve opening and closing device and the valve body are completely separated into two parts by an air and liquid separation film. The design guarantees the sanitation requirement of the sterile filling, and reduces the interference on the material flowing by the complicated design, so the material is favorable to flow, and the cavity channel is convenient to clean in all directions. The filling valve is integrally arranged on a mounting hole of a rotary table of a filling machine, and pairwise pressed by press plates, sothe valve can be conveniently mounted and detached. A pipeline of the filling valve is provided with an electromagnetic flow meter and a metal film valve for accurately controlling the filling accuracy. The valve adopts the filling method of not contacting bottle openings, so the pollution can not be caused even if the polluted bottles exist. Various functions of accurate filling of various levels, filling under the condition of bottle existence, no filling under the condition of no bottle, filling stop under the condition of bottle fulfillment, and the like can be realized by a filling control unit.

Apparatus (30) for making pre-shaped insulating sheets (10) for use in a stator or in a rotor comprising shaping elements (40-44) such to produce, starting from a continuous strip (15) made of electrically insulating material having a flat or substantially flat cross section, a strip portion having a cross section comprising a central septum (20) and two lateral portions (21-23, 21'-23') joined to a respective end portion of the central septum (20), each of the lateral portions comprising a first section (21, 21') joined to the central septum (20), a second section (22, 22') joined and perpendicular, or essentially perpendicular, to the first section (21, 21'), a third section (23, 23') joined to the second section (22, 22') and inclined with respect to the latter towards the central septum (20). The apparatus (30) further comprises a pair of opposite rollers (46, 47) having a transverse shaping profile comprising a projecting appendage (56, 57) suitable to be interfaced having a respective portion of the strip (15) facing the central septum (20) and operatively interposable between the central septum (20) and the third inclined section (23, 23').

The invention relates to a drawtube, which comprises a drawtube body and a closing device. The drawtube body comprises a first underside, a second underside and a side wall for connecting the first underside and the second underside. The side wall is provided with an inner surface and an outer surface, and an opening is up on the side wall to transfix the inner surface and the outer surface, and can be used to enclose the optical components into the drawtube body. Two installation sides are provided on the side wall to define the opening. The axis of the drawtube revolving from one end of the inner surface intersected with one installation side to the other end of the inner surface intersected with the other installation side is opened with a first groove. The curvature of the first groove is equal to that of the inner surface of the side wall on the drawtube body. The closing device matches with the opening on the drawtube body. The invention also provides an optical module with the drawtube and a method to assemble the optical module.

The invention relates to a multi-point locked double-cover sealing device and belongs to the field of design of sealing transfer devices. The multi-point locked double-cover sealing device comprises an upper door component, a lower door component and a special tool, wherein each of the upper door component and the lower door component comprises a round door plate, a door seat and multiple sets of locking and unlocking devices; the door plate is arranged in the door seat; the multiple sets of locking and unlocking devices are arranged around the center of the door plate uniformly; a groove is formed at the lower end of a latch of the upper door locking and unlocking device; the latch passes through the lower door plate and is matched with a lock shaft of the lower door locking and unlocking device; the lower end of the lock shaft is connected with a clamping plate which rotates together with the lock shaft; the lock shaft is rotated by the special tool, so that the clamping plate is screwed in or out of the groove in the lower door seat and the lower door seat is separated from the lower door plate; and the latch is connected with the lower door plate, so that the upper door plate and the lower door plate are meshed with each other, sealing reliability in any state is guaranteed, and radioactive gas does not enter a personnel operating region.

The invention discloses a recycling method of zinc hypoxide, which comprises the following steps of a, conducting alkaline cleaning on zinc hypoxide with pure alkaline liquor to obtain zinc carbonate, b, leaching zinc carbonate in Step a, separating and obtaining leaching liquor and leaching slag, c, adding an oxidant to the leaching liquor to conduct deferrization treatment, separating and obtaining a purified solution, d, conducting three-stage purification treatment on the purified solution obtained in Step c, removing impurities, namely cadmium, copper, germanium and cobalt, in the solution, separating and obtaining a deep purified solution, e, conducting ion exchange treatment on the deep purified solution obtained in Step d, and removing fluorine and chlorine in the solution, and f, electrolyzing a solution obtained after ion exchange, and separating out zinc. The recycling method of zinc hypoxide can effectively remove fluorine, chlorine and other impurities contained in zinc hypoxide, and is low in operating cost.

The invention relates to an automatic feeding and discharging device for bearing outer rings. The automatic feeding and discharging device for the bearing outer rings comprises a feeding track and a discharging track. The outlet end of the feeding track is in butt joint with a machining area. The inlet end of the discharging track is in butt joint with the machining area. A feeding stop lever and a feeding baffle are arranged at the middle end of the feeding track. The feeding stop lever is located above the feeding baffle. A bearing baffle is arranged at the tail end of the feeding track. The feeding baffle is used for isolating bearings to be machined from the machining area, so that grinding fluid is prevented from splashing during machining. The bearing baffle is used for guiding the bearings to be machined to slide downwards into the machining area and preventing the bearings from rolling out of the machining area after the bearings are machined. A discharging baffle is arranged at the tail end of the discharging track and is used for opening or closing an outlet of the discharging track, so that sealing is achieved in the machining process, and the grinding fluid is prevented from leaking outside. According to the automatic feeding and discharging device for the baring outer rings, automatic continuous feeding and discharging of the bearings can be achieved, rapidness and accuracy are guaranteed, the sealing performance is improved, and the grinding fluid is effectively prevented from splashing outwards or leaking outwards in the machining process; the structure is simple, operation is convenient, and labor intensity is greatly reduced.

The invention relates to a container washing device, in particular to an adjustable purifying device making a plurality of bottles automatically rotate. The container washing device comprises a machine frame, two groups of stop-needles which are adjusted and flexible forward and backward, a conveying belt, an adjusted bottle gripper, a positioning and rotating mechanism and a plurality of nozzles with adjusted interval on the machine frame. The bottle openings of the clamped bottles are rotated from upward to downward by the mechanisms, and are respectively aimed at the corresponding nozzles, the nozzles spray out high pressure clean air to remove the foreign body in the bottles, thereby achieving the aim of purifying the inner cavity of the bottle, compared with the prior device, the speed and the efficiency are increased. The lower part of the nozzle is provided with a dust collection device, the whole device on the installation machine frame is covered by the cover to ensure the work environment is not polluted.

To solve the problem that the prior art has no paint with waterproof, watertight and anticorrosive performances, the invention provides waterproof paint with good waterproof, watertight and anticorrosive performances. The waterproof paint comprises a sulfur polymer which has a netted macromolecule structure and also comprises solid powder particles interfused into the polymer. The waterproof paint can be applicable for a waterproof, watertight and anticorrosive pool of concrete, tunnels, underground, bridge surfaces and chemical plants, a methane pool and other surfaces which need waterproofing and anticorrosion.

The present invention relates to slurry for printing wallpaper, and in particular to special slurry for printing wallpaper having a 3D stereo transparent streamer effect and a preparation method for the special slurry. The present invention provides special slurry for printing wallpaper having the 3D stereo transparent streamer effect. The slurry is mainly prepared by the following raw materials in parts by weight: 5-20 parts of dioctyl phthalate, 30-50 parts of polyvinyl chloride paste resins, 1-2 parts of a foaming agent, 1-5 parts of D80 environmental-friendly solvent oil, 10-30 parts of calcium carbonate, 10-30 parts of a plasticizer, 1-5 parts of a stabilizer, 5-8 parts of a VAE emulsion, 5-20 parts of titanium dioxide, 1-3 parts of a thickener and 1-3 parts of a drying speed regulator. The adhesive force of the slurry provided by the present invention is strong; meanwhile, the transparency effect can be displayed. The slurry is suitable for performing an embedding process on gold powder, silver powder and pearl powder in a gold spraying process, and can wrap up the gold powder, silver powder and pearl powder to promote the level of the wallpaper and prolong the service life of the wallpaper.

The invention discloses an artificial graphite crucible and a preparation method thereof. The artificial graphite crucible is prepared from main raw materials in percentage by weight as follows: 45%-65% of coke, 15%-25% of artificial graphite powder and 20%-30% of high-temperature modified pitch. Firstly, the prepared coke and artificial graphite powder are crushed, and the high-temperature modified pitch is molten into a liquid; the treated raw materials are uniformly mixed and kneaded, and paste is obtained; the paste is cooled and formed, and a raw graphite crucible product is obtained; theraw graphite crucible product is sent to an annular roaster with a cover to be roasted, and a primary roasted product is obtained; the primary roasted product is sent to a high-pressure impregnationtank for pressurized impregnation, and a graphite crucible impregnated product is obtained; the impregnated product is sent to an underbody roaster to be roasted, and a secondary roasted product is obtained; the secondary roasted product is sent to a graphitization furnace for graphitization, and a graphite crucible graphitized product is obtained; finally, conventional machining is performed andthe artificial graphite crucible product is obtained. The prepared artificial graphite crucible has high capacity and good use performance.

The invention discloses an efficient environmental-friendly automatic processing control system for dehydrated vegetables. The processing process of the efficient environmental-friendly automatic processing control system is characterized by concretely comprising the following steps: (1) feeding; (2) sectioned peeling; (3) primary rinsing; (4) stone removal; (5) secondary rinsing; (6) temporary material storage; (7) slicing; (8) drying. A slicer is connected with a conveying belt for a drying box. Slices are free of cleaning before drying, various nutrients in the product are kept, the strong taste of the product is promoted, the yield of primary product reaches to 32 percent and is increased by 5 percent compared with the same industry, and the use of raw materials is saved. A novel drying machine has the advantages of high heat utilization rate, high yield, uniform product color and constant water, adopts natural gas or electricity as a heat source, and achieves the target of clean production. The novel processing process for the dehydrated vegetables is high in yield of primary product, keeps the original nutritional value, and is wide in applicability.

The invention relates to a cleaning device for a petrochemical pipeline. The cleaning device comprises a base, a motor, an installation plate, support rods, a screw rod, brushes and a cleaning cylinder. The installation plate is arranged at the middle position of the top of the base. The support rods are arranged on the two sides of the installation plate. The other ends of the support rods are fixed to the base. The motor is arranged at the middle position of one side of the installation plate. The lead screw is arranged at the middle position of the other side of the installation plate. The lead screw and the motor are symmetrically arranged in position. By means of the cleaning device for the petrochemical pipeline, due to the cleaning cylinder arranged on the lead screw in a sleeving manner, the cleaning cylinder can be pushed to move forward in the pipeline to conduct cleaning simply through rotation of the motor, the cleaning cylinder can be taken out only through reverse rotation of the motor during taking-out, and meanwhile the pipeline is secondarily cleaned again. The structure is simple, use is convenient, and the cleaning effect is obvious. Due to the fact that a water baffle and a water sucking opening in the lower portion of the water baffle are arranged, when the pipeline is cleaned through the device, sewage cannot flow out from a pipeline opening, the sewage is conveyed to a sewage treatment pool through the water sucking opening, and the field environment is protected against pollution.

The invention provides an unhooking device for bare duck processing. The unhooking device is composed of a suspension device and a check block device. The suspension device at least comprises a groove and can move freely, the check block device is located below the suspension device, and at least one inclined plane inclined upwards is arranged in an advancing direction of the suspension device. The unhooking device is characterized in that the suspension device can move freely under the exogenic action, the neck of a bare duck is just placed in the groove positioned on the suspension device, and the bare duck is driven to move freely; when the bare duck passes across the check block device, due to the fact that the check block device is provided with the inclined planes, the bare duck is gradually lifted and automatically drops, manpower is saved, working efficiency is greatly improved, the bare duck processing can be subjected to large-scale production simultaneously, and due to the fact that manpower is not used, ducks are not polluted in the link.

The invention relates to a layer-stepping type multi-filter disc filter machine which comprises a cylindrical pressure container, wherein the container is provided with a feeding pipe, a rotating main shaft is arranged at the central axis of the container, and the rotating main shaft passes through the top of the container to be mutually connected with the output shaft of a gear motor; the top of the container is further fixedly provided with a displacement mechanism, and the displacement mechanism drives the rotating main shaft to move up and down in the container; at least two groups of filter devices are uniformly arranged along the vertical direction between the inner wall of the container and the rotating main shaft, any group of filter device comprises a filter disc and a scraper which are horizontally arranged, and the scraper of any group of filter device is arranged above the corresponding filter disc; a liquid discharge passage and a discharge passage which are used for communication and are communicated with the filter device are arranged in the container. The layer-stepping type multi-filter disc filter machine provided by the invention is compact in structure, the operation is reliable and stable, the filter effect is greatly improved, and the filtering effect is good.

The invention relates to a method for separating and purifying chlorogenic acid and 3,5-dicaffeoylquinic acid from a honeysuckle flower. According to the method, the honeysuckle flower is taken as a raw material and the method comprises the following steps: (1) preparing a honeysuckle flower crude extract; (2) extracting; (3) separating and purifying through macroporous adsorption resin; (4) separating and purifying through a semi-preparation type high efficiency liquid chromatography, namely separating and purifying by adopting the semi-preparation type high efficiency liquid chromatography to obtain two high-purity components by taking methanol-water as a mobile phase, wherein the two high-purity components are respectively identified as the chlorogenic acid and the 3,5-dicaffeoylquinic acid. The process disclosed by the invention is environment-friendly in process without severe harm on the environment and is low in integrated cost.

The invention relates to antibacterial filtering ceramic, in particular to in-situ composite antibacterial filtering ceramic as well as a preparation method and application thereof. The composite antibacterial filtering ceramic is prepared from the following components in percentage by mass: 60 to 75 percent of kieselguhr, 10 to 20 percent of hydroxyapatite, 10 to 30 percent of purple sand, 0.1 to 2 percent of silver and 1 to 5 percent of an adhesive, and the mass percentage sum of the five components is 100 percent. The diameter of the silver is 3 to 20 nm, and the silver is located on the surface and in gaps of the kieselguhr. According to the in-situ composite antibacterial filtering ceramic, combination of nano silveer and porous kieselguhr, combination of the silver and the hydroxyapatite and combination of silver-carried hydroxyapatite and the porous kieselguhr are realized under a hydrothermal condition, so that the dispersivity of the silver and the binding force of the silver and a material are improved. The material is high in filtering performance, antibacterial property and antibacterial endurance, can effectively filter out microorganisms, impurity particles and organic matters from water, and can be widely applied to the field of water treatment and relevant industries.

The invention relates to a package of light-sensitive element and relative production. Wherein, it comprises: mounting light-sensitive chip on the base plate; clearing the contaminant; then using adhesive to mount a transparent sealing cover with chamber above the base plate, to cover the chip; therefore, it can clear the contaminant, improve the yield and reduce the packing area; in addition, the invention can arrange connecting part above the base plate and sealing cover to support connection.

The invention relates to a sterilization system for a medium, a method for sterilization of a medium by using the sterilization system and a culture method for cordyceps militaris. The sterilization system for a medium comprises a steam generator and a sterilization cabinet connected through an exhaust pipeline, wherein the exhaust pipeline connected with the end of the sterilization cabinet is divided into two branch pipelines, one branch pipeline is straight, and a vacuum tank and a water circulating vacuum pump successively connected are installed on the other branch pipeline. According to the invention, voidage of the medium is increased, growth space of mycelia is enlarged, the medium has a fast cooling speed and a high drying degree, the purpose of improving biotransformation efficiency is finally achieved, production cost is reduced, which is favorable for popularization and application of corresponding technologies, and a high practical value and a high application value are obtained.

The invention relates to a prefabricated shear wall vertical steel bar positioning device which comprises an elevation clamp, positioning angle steel, a positioning steel sleeve plate, a screwing partand a steel bar protecting pipe. The elevation clamp consists of two semicircular hoops, one semicircular hoop is provided with a protruded limiting block, the positioning angle steel is provided with a rib, a steel bar positioning groove and a screwing hole, and the other side is provided with evenly spaced fixing holes; two sides of the positioning steel sleeve plate formed in the positioning steel sleeve plate are provided with fixing grooves connected with the positioning angle steel fixing holes in the wall direction, the middle and two ends of the steel sleeve plate are provided with pouring ports facilitating concrete pouring, and the two ends are provided with a web plate and a compressing plate which are centrosymmetric. The end, close to a handle, of the screwing part is provided with a limiting thrust bearing, and the end, away from the handle, of the screwing part is provided with a screwing nut. The steel bar protecting pipe is a PVC pipe with one closed end. By adoptingthe scheme, accurate positioning of prefabricated shear wall vertical steel bars and cast-in-situ edge member vertical steel bars can be achieved.

The invention discloses a portable liquid slug spraying fire extinguisher, which aims at providing the novel portable fire extinguisher having the advantages of simple structure, easy carrying and safe use and spraying continuously a liquid fire extinguishing agent pill, and pertains to a fire control apparatus. The invention consists of a liquid slug spray gun and a stock solution ejection device. An infusion port of the liquid slug spray gun is connected with a perfusion tube of the stock solution ejection device; the stock solution ejection device is composed of a stock solution syringe and a gas accumulator which are connected with each other by a gas transmission valve; a piston is arranged in the stock solution syringe; a gas pressure tank is arranged at one side of the piston; and a hydraulic pressure tank is arranged at another side of the piston and connected with the perfusion tube. The invention utilizes a compressed gas to push the piston to eject the liquid slug, and has a stable ejecting rate and a powerful impact, which is suitable for putting out a fire in a closed car, the fire of an eruptible gas and the fire of an electrified electric appliance, etc., and especially for extinguishing a fire disaster caused by a self-combustion of the car on an overhead, an expressway and a bridge, etc. The portable fire extinguisher is suitable for a fire fighter to carry on the back to use, and being configured on a fire fighting go-cart and a fire fighting motorcycle, etc.

The present invention describes an access node (140, 200) for communication in a telecommunication network comprising: an input / output unit (210) adapted for receiving a first information message, wherein the first information message comprises a logical address associated with a virtual network node, a processing unit (230) for extracting the logical address of the virtual network node and for determining a hardware address associated with the logical address of the virtual network node, where the processing unit (230) is further adapted for a determining a logical address of an end-user host (110, 112 communicating with the virtual network node, wherein the access node (140) is configured to transmit a second information message comprising the logical and hardware address of the virtual network node to the logical address of the end-user host (110, 112). Also, a network infrastructure (100) where the access node (140, 200) is operating, is described. The access node (140, 200) also implements a method of the present invention by means of a computer program comprising instruction sets for implementing the method steps of the invention.

The invention discloses a multifunctional care bed, which relates to an appliance with the function of caring a patient and comprises a care bed body, a movable lavatory appliance which is arranged under the care bed body, a movable washing device and the like, wherein the movable washing device comprises a storage platform, a shampoo bowl, a sewage bucket and a clean water bucket; the shampoo bowl, the sewage bucket and the clean water bucket are placed on the storage platform; and a lifter of the shampoo bowl and a control button of the lifter of the shampoo bowl are installed under the shampoo bowl. In the multifunctional care bed, an integrated circuit board is applied for control; in this way, all mechanisms can be controlled only by remote control; bedridden patients can relieve themselves per se under the condition that no one stay at home for care; the product can also carrying out flushing and drying automatically; ordure can be sealed in a plastic bag sealed automatically so as to keep indoor air unpolluted; the multifunctional care bed is provided with the shampoo bowl; and the shampoo bowl can be lifted automatically, which is more convenient for washing the head.

The invention provides a saliva preservation solution, and a preparation method and application thereof. The saliva preservation solution comprises a DNA stabilizer including disodium edentate, tartaric acid and at least one selected from a group consisting of nitrilotriacetic acid and dihydroxyethylglycine; a microbial inhibitor including penicillin, streptomycin, geneticin and at least one selected from a group consisting of potassium sorbate, sodium benzoate, ethylparaben sodium, ketoconazole and puromycin; and a buffer solution including a TE buffer solution and at least one selected from a group consisting of a PBS buffer solution and a sodium chloride glucose buffer solution. According to the invention, through preparation of the saliva preservation solution, the morphology of cells in a saliva swab is maintained and prevented from disruption, and the growth of microorganisms in the saliva swab and the saliva preservation solution is inhibited.

The invention discloses a production method of an amino acid plant nutrient solution. The method comprises the following steps: extracting thalli from the fermentation effluent of MSG (monosodium glutamate) to evaporate and concentrate, and crystallizing to separate and obtain ammonium sulfate and a concentrate; treating the concentrate with CaO and liquid ammonia, fixing sulfate radicals, and adjusting the pH value to obtain the amino acid plant nutrient solution. By adopting the production method, the wastewater treatment problem of the MSG fermentation industry can be solved fundamentally, the wastewater can be converted into the amino acid plant nutrient solution, and the environmental benefit, economic benefit and social benefit are significant.

The invention relates to a hydraulic cylinder assembly for a machine for producing a fiber web, especially a paper or cardboard making machine. The assembly comprises a hydraulic cylinder (2) having a cylinder housing (21) and a piston (27) which can be displaced inside the cylinder housing, said piston subdividing the cylinder housing into a chamber (22) on the cylinder head side and a chamber (23) on the cylinder back end side, and at least one digital hydraulic pressure controller (3) which is integrated into the assembly. Said pressure controller is associated with the chamber on the cylinder head side and the chamber on the cylinder back end side and controls a supply of working fluid to and a discharge thereof from the chambers to adjust the pressure of the working fluid in at least one of the chambers of the hydraulic cylinder (2).