799 results about "Beaker" patented technology

The invention discloses a synthesis method and application of an iron-aluminum co-doped catalyst, and the synthesis method is characterized by comprising the following steps: S1, dissolving an aluminum metal salt and an iron metal salt in a beaker containing deionized water to obtain a solution A; s2, adding a phosphorus source into the solution A, and adjusting the pH to form a turbid liquid B; s3, biomass is added into the turbid liquid B to be stirred for 30 min, and a solution C is obtained; s4, adding a nitrogen source into the solution C, and drying the beaker in a water bath kettle; mixing the obtained dried product with an activating agent, and calcining under inert gas to obtain a catalyst crude product; and S5, grinding the catalyst crude product, washing with ethanol and deionized water, and carrying out vacuum drying to obtain the iron-aluminum co-doped catalyst. The preparation method is simple and low in equipment requirement. The invention discloses a novel nitrogen-doped carbon-coated zero-valent iron nanoparticle catalyst which can degrade pollutants by utilizing electron transfer of the pollutants and the catalyst under the condition of adding any oxidizing agent. Under the neutral room temperature condition, the catalyst has a very good removal effect on degradation of organic pollutants which are difficult to biodegrade, has very good stability, and is low in iron ion dissolution rate.

A method for detecting circularity of silicon carbide micro powder relates to the technical field of silicon carbide detection, and comprises the following steps: S1, turning on a flowing particle imager, preheating and then carrying out background detection; s2, adding standard particles into the sample pool, and enabling the flowing particle imager to perform automatic focusing; s3, adding the prepared silicon carbide micro powder sample into a sample pool, and detecting by using a flowing particle imager; and S4, storing the detection result, checking the silicon carbide micro powder particle image, and recording the detection result. The preparation of the silicon carbide micro-powder sample comprises the following steps: S31, adding the dried silicon carbide sample into a dry and clean beaker; s32, sequentially adding an impregnating compound, a dispersing agent and deionized water into the beaker; s33, carrying out ultrasonic dispersion; and S34, taking out the uniformly mixed sample. The method can solve the technical problem of detection failure caused by easy agglomeration of the silicon carbide sample when the flowing particle imager is used for detecting the circularity of the silicon carbide micro powder.

The invention discloses a nitrogen-doped zinc ion battery manganese-based positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a strong oxidant and a manganese salt, putting the mixture into a beaker, adding deionized water, and uniformly stirring to form a mixed solution; transferring the mixed solution into a high-pressure reaction kettle with a polytetrafluoroethylene lining, and heating the high-pressure reaction kettle in a drying oven; cooling, precipitating, filtering and washing for multiple times, and then putting into a drying oven for vacuum drying to obtain an original manganese-based positive electrode material; the preparation method comprises the following steps: respectively weighing an original manganese-based positive electrode material and hexamethylenetetramine, flatly laying the original manganese-based positive electrode material at the bottom of a lining of a reaction kettle, and putting the hexamethylenetetramine into a beaker; and putting the beaker into a reaction kettle, moving the beaker and the reaction kettle into a drying oven, and heating to obtain the surface nitrogen-doped manganese-based positive electrode material.

The invention provides a preparation method of a MoTe2 single crystal. The preparation method comprises the following steps: A, weighing molybdenum powder, tellurium powder and cobalt powder according to a stoichiometric ratio; b, the powder weighed in the step A is poured into a glass beaker, convective mixing is achieved under the action of a stirrer, and the duration time is 20-30 minutes; c, pouring the powder ground in the step B into a crucible, and sealing; d, putting the crucible in the step C into a glass tube; e, covering the glass tube in the step D with a glass cap; f, vacuumizing the glass tube by using a vacuum pump set, then filling argon, repeating the gas washing process for three times, and then vacuumizing again; g, aligning the middle position of the glass cap, heating to melt the tube wall of the glass tube and the glass cap together, and completing vacuum sealing; and H, putting the glass tube in the step G into a box-type furnace, sintering, taking out, putting into a water bucket, and quenching to obtain a single crystal sample.

The invention discloses a stirring and heating device and method for measuring hexavalent chromium in soil and sediment, the stirring and heating device comprises a stirring and heating cabin and a power cabin, a stirring and heating cabin cover is arranged above the stirring and heating cabin, a magnetic stirring device and a driving motor are arranged in the power cabin, and a beaker bracket and a heating pipe are arranged in the stirring and heating cabin; the heating pipe is located on the inner bottom face of the stirring and heating cabin, the beaker bracket is located above the heating pipe, stirring and heating cabin cover open holes and a stirring and heating cabin cover handle are arranged above the stirring and heating cabin cover, and the number and the position of the stirring and heating cabin cover open holes correspond to those of the beaker bracket. The lower end of the central rotating shaft is connected with an output shaft of the driving motor, the upper end of the central rotating shaft penetrates through the central position of the stirring and heating cabin cover, and an infrared temperature measuring device is arranged at the upper end of the central rotating shaft. The method can effectively improve the detection efficiency and precision of hexavalent chromium in soil and sediments.

The invention discloses a method for determining the content of trace holmium, thulium and tungsten in rare earth erbium and a compound thereof, which comprises the following steps: placing a rare earth erbium and compound sample thereof in a beaker, and performing a blank test along with a sample; adding nitric acid, heating at low temperature until the sample is completely dissolved, and cooling; transferring into a volumetric flask, adding a cesium internal standard solution, diluting with water, and uniformly mixing; the holmium, the thulium and the tungsten are measured by using an oxygen mode of an inductively coupled plasma tandem mass spectrometer, and the contents of the holmium, the thulium and the tungsten are calculated according to a working curve method. According to the method, the inductively coupled plasma tandem mass spectrometry technology is used, and mass spectrum interference of an erbium matrix on holmium, thulium and tungsten is effectively eliminated by selecting a proper reaction mode and optimizing the flow of reaction gas.

The utility model discloses a water quality COD (Chemical Oxygen Demand) detection device, and relates to the technical field of CODMn detection, the water quality COD detection device comprises a base, a plurality of counter bores are formed in the base at intervals, and a beaker is placed in any counter bore; a plurality of groups of detection devices for detecting color change of liquid in the beaker are arranged on the base; a plurality of stirring mechanisms are further arranged at the bottom of the base; and the plurality of detection devices and the plurality of stirring mechanisms are in one-to-one correspondence with the plurality of counter bores. The detection device is mounted on the base, double detection means of a photoelectric receiver and a camera can be adopted in COD detection titration, and meanwhile, a monitoring function is achieved, so that the detection stability and repeatability are improved.

The application discloses a heating magnetic stirrer, a stirring driving device, a temperature measuring device and a temperature control device, wherein the stirring driving device is used for mixing the solution in a beaker and making the temperature distribution of the solution in the beaker more uniform; the temperature measuring device comprises a solution temperature measuring device and a heating table temperature measuring device; the solution temperature measuring device is used for measuring the solution temperature in the beaker and taking the solution temperature as a feedback amount of a main ring; the heating table temperature measuring device is used for measuring the temperature of the heating table and taking the temperature as a feedback amount of a secondary ring; and the temperature control device adopts a fuzzy-serial PID control mode and is used for precisely controlling the solution temperature in the beaker. The heating magnetic stirrer can realize high-precision control of the medium solution temperature, has a small overshoot amount and good stability, and is suitable for different medium solutions.

A heating assembly is arranged on the outer side of the bottom of an inner shell, an outer shell comprises an outer side shell forming a vacuum layer with the side wall of the inner shell, the outer shell further comprises an outer bottom shell, and the outer bottom shell, the outer side shell and the outer wall of the lower bottom of the inner shell form a containing cavity for containing the heating assembly. The outer shell comprises an outer side shell forming a vacuum layer with the side wall of the inner shell, the side edge heat preservation effect is good, the outer bottom shell, the outer side shell and the outer wall of the lower bottom of the inner shell form a containing cavity for containing a heating assembly, the whole body is independent, reliable and convenient to carry, can be matched with a power line or a power source to be carried, is lighter, and can be electrically connected when the power source is needed. And the inner shell and the outer shell are arranged, so that cleaning and disinfection are facilitated, the containing cavity for containing the heating assembly is formed, good heat preservation can be achieved, and the complete heating effect is achieved.

The application provides a funnel spout and beaker position detection method, system, terminal and medium, comprising: acquiring a video of experimental operation; extracting any image in the video and inputting the image into a ResNet18 model to obtain the position relationship of the funnel spout and the beaker on both sides; inputting the key frame of the video into a CRNN model to obtain the drop state of the funnel spout; and judging whether the funnel spout and the beaker are attached to the wall according to the position relationship of the funnel spout and the beaker on both sides and / or the drop state of the funnel spout. The application performs multi-directional detection and judgment, avoids misjudgment, greatly improves the test accuracy, and saves a large amount of manpower cost.

The invention belongs to the technical field of pharmaceutical preparations, and particularly relates to a beclomethasone propionate suspension for inhalation and a preparation method of the beclomethasone propionate suspension. The preparation method of the beclomethasone propionate suspension for inhalation mainly comprises the following steps: S1, preparing sterile beclomethasone propionate particles by using a supercritical fluid rapid expansion method, and collecting the sterile beclomethasone propionate particles into a sterile glass beaker; s2, adding sterile water in which a surfactant is dissolved, and dispersing by ultrasonic dispersion equipment; s3, preparing an auxiliary material solution of beclomethasone propionate, and filtering by using a sterile filter membrane; s4, mixing the solution in the step S2 and the solution in the step S3, and dispersing by using ultrasonic dispersion equipment; and step S5, filling and sealing into an ampoule bottle to prepare the beclomethasone propionate suspension for inhalation. The beclomethasone propionate suspension for inhalation is more uniform in particle size distribution and good in stability, the preparation process is carried out under relatively mild conditions, and the technological operation is simple and convenient.

The invention discloses a method for determining the content of chloride ions in coal gas, and relates to the technical field of determination of chloride ions in coal gas. The method for measuring the content of the chloride ions in the coal gas comprises the following steps: S1, a sampling link, S2, an analysis stage and S3, a calculation process, in the sampling link S1, two absorption bottles filled with ultrapure water and an empty absorption bottle are sequentially connected in series at a coal gas sampling opening, the absorption bottle is connected with a high-position gas diffusion pipe by virtue of a wet-type gas flow meter, and then gas is introduced at the flow speed of 0.5 L / min; s2, an analysis stage: pouring the absorption liquid in the two absorption bottles into a beaker, heating to boil, maintaining for 30 seconds, and then cooling to normal temperature for later use; the content X1 of chloride ions in the absorption liquid is calculated, and the formula is X1 = (V1-V0) * C * 0.03545 / V * 10 {6} * 35.5. According to the method, accurate sampling is conducted, an absorption bottle is connected in series, the flow speed is controlled, high-purity ultrapure water is matched, the chloride ion absorption efficiency and accuracy are greatly improved, and a foundation is built for follow-up accurate measurement.

The invention relates to the technical field of digestion, in particular to a pretreatment method for digesting a glass substrate. The pretreatment method comprises the following four key steps: firstly, crushing and grinding a glass substrate sample into powder so as to increase the contact area and accelerate the subsequent reaction speed; next, adding a mixture of ammonium bifluoride and ammonium fluoride and the powder sample into a polytetrafluoroethylene beaker, adding a small amount of water for wetting, and then adding concentrated hydrochloric acid and concentrated nitric acid to effectively promote the dissolution of the sample; then, the beaker is placed on a heating plate to be heated and digested, and after it is confirmed that the sample is completely digested by monitoring the state of the solution, the sample is cooled to the room temperature. And finally, transferring the digestion solution to a volumetric flask, rinsing the original beaker for multiple times with pure water, and diluting to a constant volume. According to the method, the digestion time is remarkably shortened, the background interference is reduced, the detection precision is improved, and the method is particularly suitable for the requirements of high-end analysis equipment such as AAS and ICP.

The utility model relates to a quantitative analysis device for asphalt mixture interface adhesion performance based on three-dimensional scanning, and belongs to the technical field of building material detection. The garbage can comprises a cylindrical can body with a cover, wherein the side surface part of the can body is hollowed; a cross-shaped guide rail is arranged on the inner surface of an upper cover of the cylindrical can body with the cover, the straight-barrel-type electric telescopic rod is connected with a sliding block of the cross-shaped guide rail, and a hook is arranged at the bottom of the straight-barrel-type electric telescopic rod. A semi-ring-shaped guide rail is arranged on the inner wall of the cylindrical can body with the cover, the U-shaped clamp is connected with a sliding block of the semi-ring-shaped guide rail through a transverse connecting rod, and the non-contact three-dimensional laser scanner is clamped in the U-shaped clamp. The bottom of the cylindrical barrel body with the cover is provided with two constant-temperature electric heating furnaces which are distributed at an interval, and the two constant-temperature electric heating furnaces are respectively provided with a beaker. The asphalt-aggregate adhesion performance evaluation test device can simplify the steps of the asphalt-aggregate adhesion performance evaluation test, improves the defects in the original test evaluation method, and can better adapt to the engineering characteristic evaluation of the asphalt in the construction site environment.

The invention discloses a micro-arc oxidation coating for an artificial hip joint Ti6Al4V alloy and a preparation method of the micro-arc oxidation coating. The preparation method comprises the following steps that S1, pretreatment is conducted; s2, preparing a micro-arc oxidation electrolyte; s3, preparing a micro-arc oxidation coating; s4, cleaning and drying treatment; a preparation method of the electrolyte comprises the steps that 6 g of sodium metaaluminate solid powder, 4 g of potassium hydroxide solid powder, 2 g of sodium hexametaphosphate solid powder, 4 g of sodium silicate solid powder and 4 g of yttrium oxide nanoparticles are sequentially weighed and added into a beaker, then 980 mL of ultrapure water at the temperature of 60 DEG C is added into the beaker, and stirring is conducted for 2 min while the temperature is kept; the yttrium oxide particles are approximately spherical or ellipsoidal, the particle size range is 20-50 nm, and the purity is 99.99%. The yttrium oxide nanoparticles are introduced into the electrolyte, the micro-arc oxidation coating containing the yttrium oxide is prepared on the surface of the Ti6Al4V alloy, and compared with a traditional micro-arc oxidation coating, the surface porosity of the micro-arc oxidation coating containing the yttrium oxide is remarkably reduced, and the compactness is remarkably improved.

The invention provides a method for determining boron element in iron ore, which comprises the following steps: weighing 0.2 g of sample, uniformly mixing with a flux, heating to red at 700-800 DEG C, cooling, adding sodium peroxide for secondary melting, dissolving in water, and transferring to a beaker; adding ethanol to boil, fixing the volume to 500mL, filtering and taking 100mL, adjusting the pH value, adding hydrogen peroxide to slightly boil, cooling, adding barium carbonate to boil, diluting and filtering, and taking 25mL for color development determination. According to the method, sodium carbonate and / or potassium carbonate and sodium peroxide are adopted to form a composite flux, an iron ore sample is completely decomposed through secondary melting and step-by-step dissolution, and the sample decomposition efficiency is improved; the method is stable in recovery rate, is superior to a conventional method in precision, can accurately measure the boron content in the iron ore, meets the technical requirements on boron element detection in the fields of ferrous metallurgy, geological exploration and the like, provides an efficient and reliable detection means for boron content analysis, and ensures the accuracy and reproducibility of a detection result.

A temperature-control low-pressure beaker for a vibration cavitation erosion test is characterized in that a beaker body is a double-layer beaker body composed of an inner-layer beaker body and an outer-layer beaker body, a cavity is formed between the inner-layer beaker body and the outer-layer beaker body, and a main control board, an operation panel and an electric heating coil are arranged in the cavity at the bottom of the beaker body, an electric connector connected with the operation panel is further arranged, two or more semiconductor refrigeration chips are symmetrically arranged in a cavity located in the side wall of the cup body, a magnetostriction instrument amplitude-change pole penetrates through the center of the cup cover, and the end of the magnetostriction instrument amplitude-change pole is connected with a tested test piece located in the cup body. An exhaust mechanism communicated with the interior of the cup body is arranged on the side wall of the cup body. The test device capable of autonomously controlling air pressure and intelligently controlling temperature is designed on the basis of original test requirements, can be used for simulating a low-air-pressure environment at a high altitude, and is convenient for researching a cavitation mechanism at low air pressure by using a vibration cavitation test.

A preparation method of a platinum-boron aluminum catalyst for dehydrogenation of methylcyclohexane comprises the following steps: step 1, taking aluminum nitrate nonahydrate, adding CTAB (cetyltrimethyl ammonium bromide), and pouring absolute ethyl alcohol into a beaker A; adding boric acid and deionized water into a beaker B, and pouring the solution in the beaker B into the beaker A; slowly dropwise adding ammonia water into the beaker A, then adding absolute ethyl alcohol, and aging; evaporating the solution in the beaker A, drying in a drying oven, and finally putting in a muffle furnace; preparing a B-O-Al carrier with a large specific surface area; step 2, putting the B-O-Al carrier with the large specific surface area and absolute ethyl alcohol into a beaker, then adding a chloroplatinic acid solution, then putting the beaker into ultrasonic waves for oscillation, and then putting the beaker into a drying oven for drying to obtain a Pt / B-O-Al (unreduced) catalyst; and putting the Pt / B-O-Al (unreduced) catalyst into a tubular furnace, and reducing the Pt / B-O-Al (unreduced) catalyst under the condition of H2 to finally obtain the Pt / B-O-Al catalyst. The catalyst has the characteristics that the low-temperature requirement is low, the sintering inactivation resistance is high, and high-efficiency, long-life and stable dehydrogenation can be realized under the low Pt loading capacity (1wt%).

The present application relates to laundry liquid preparation technical field, specifically disclose a kind of detection device for stickiness of laundry liquid preparation, including base and device body, the top of base is connected with device body by telescopic cylinder, the bottom of device body is provided with detection mechanism, the top of base is slidably installed with moving plate, the top of moving plate is rotatably installed with rotating frame, the inside of moving plate is provided with drive mechanism for driving rotating frame rotation adjustment, the two sides of rotating frame outer wall are provided with clamping mechanism for clamping and fixing beaker with laundry liquid sample. In the application, during the process that device body drives rotor to detect laundry liquid in beaker, clamping mechanism can clamp and fix beaker, avoid beaker to move or tilt during detection process, ensure the stability of beaker during detection process is not affected, to improve the precision of laundry liquid stickiness detection.

The invention discloses drug residue detection equipment for aquatic product quality safety, and relates to the technical field of aquatic product drug detection.The drug residue detection equipment comprises a sampling mechanism and a pressing plate installed at the top of the sampling mechanism, a detection mechanism is arranged at the bottom of the sampling mechanism, and a detection beaker is arranged in the detection mechanism; the sampling mechanism comprises a first lifting support, a first lifting motor is fixedly mounted at the top of the first lifting support, the output end of the first lifting motor is fixedly connected with a first lifting threaded rod, and the outer side of the first lifting threaded rod is in threaded connection with a first lifting threaded sleeve; a lifting limiting block is fixedly installed on the outer side of the first lifting threaded sleeve, after liquid sampling is conducted through a heating ring, a solution can be heated and evaporated, steam is discharged through a through hole, and therefore the concentration of the solution can be increased, medicine residues can be conveniently detected, and through rotation of a fan-shaped cutting knife and a cutting sleeve, the medicine residues can be conveniently detected. And aquatic products can be conveniently cut.

The invention belongs to the field of luminescent materials, and provides a lignin-based long-afterglow luminescent material as well as a preparation method and application thereof. The preparation method of the long-afterglow luminescent material comprises the following steps: uniformly grinding urea, boric acid and lignosulfonate, placing the obtained solid mixture in an open beaker for heating treatment, naturally cooling to room temperature after the reaction is completed, and grinding to obtain the long-afterglow luminescent material. The obtained long-afterglow luminescent material powder can emit yellow green afterglow after being excited and removed by ultraviolet light, the average attenuation life of the long-afterglow luminescent material powder can reach 1200 ms or above, the macroscopic afterglow emission time can reach 10 s or above, and the long-afterglow luminescent material powder is convenient to prepare, low in raw material cost and environmentally friendly. The obtained long-afterglow luminescent material has important application in the fields of information encryption, biochemical sensing and the like.

The invention relates to the technical field of laundry detergent preparation, and particularly discloses a laundry detergent viscosity detection device which comprises a base and a device body, the top of the base is connected with the device body through a telescopic air cylinder, a detection mechanism is arranged at the bottom end of the device body, and a moving plate is slidably mounted at the top of the base; a rotating frame is rotatably mounted at the top of the moving plate, a driving mechanism used for driving the rotating frame to rotate and adjust is arranged in the moving plate, and clamping mechanisms used for clamping and fixing beakers with laundry detergent samples are arranged on the outer walls of the two sides of the rotating frame. According to the device, in the process that the device body drives the rotor to detect the laundry detergent in the beaker, the clamping mechanism can clamp and fix the beaker, the beaker is prevented from moving or inclining in the detection process, it is ensured that the stability of the beaker is not affected in the detection process, and the detection precision of the viscosity of the laundry detergent is improved.

The invention relates to a heating and stirring device for a laboratory. The heating and stirring device comprises a mounting rack, a heat preservation box, a stirring motor, a stirring assembly, a mounting seat and a lifting mechanism, the heat preservation box is provided with a bottom opening and a heat preservation chamber for arranging beakers, and a heating assembly is arranged in the heat preservation box; the mounting seat comprises a mounting table, a mounting structure for arranging the beaker and a stirring bracket for arranging the stirring assembly; the stirring assembly comprises a stirring shaft and stirring blades, and butt joint structures for transmitting torque are arranged at the top end of the stirring shaft and the bottom end of an output shaft of the stirring motor; the mounting base is provided with a first station and a second station after being lifted by the lifting mechanism, when the mounting base is located at the first station, a beaker on the mounting base is located in a heat preservation chamber of the heat preservation box, and the stirring shaft is in butt joint with an output shaft of the stirring motor; when the mounting base is located at the second station, the beaker on the mounting base is located on the lower side of the heat preservation box. The epoxy resin stirring device has the effect of improving the experiment efficiency of stirring epoxy resin in a laboratory.

The invention provides a method for rapidly measuring the content of emulsified asphalt evaporation residues in a water bath, which comprises the following steps: S1, pouring emulsified asphalt into a container, then pouring an ethanol water solution, and uniformly mixing; s2, the container is placed in a boiling water bath environment, heating is conducted while even mixing is conducted, and the test is finished when the mass change of emulsified asphalt evaporation residues and the beaker within one minute does not exceed 1%; s3, weighing the container, the emulsified asphalt and the mass of the emulsified asphalt evaporation residues and the container after the test is finished, and calculating the content of the emulsified asphalt evaporation residues; wherein the volume fraction of ethanol in the ethanol aqueous solution is 60%-85%. Compared with a traditional evaporation residue obtaining method, the method has the advantages that the test time can be effectively shortened, and the aging problem of the emulsified asphalt evaporation residues in the heating process is fully avoided.

The invention relates to the technical field of element detection, in particular to a method for measuring the manganese content in copper concentrate, which comprises the following steps: weighing a copper concentrate sample with the mass of m in a tetrafluoroethylene beaker, and adding a small amount of water to soak the sample; adding nitric acid and hydrochloric acid, and heating at 200-300 DEG C for 5-10 minutes; then adding perchloric acid and hydrofluoric acid, heating at 200-300 DEG C until the copper concentrate sample is completely dissolved, and cooling to room temperature; adding dilute nitric acid, and heating to dissolve the separated salt crystals to obtain a to-be-detected pre-solution; transferring the to-be-detected pre-solution to a volumetric flask, adding water to dilute the pre-solution to a scale line, and uniformly shaking to obtain a to-be-detected solution; according to the method, a nitric acid-hydrochloric acid-perchloric acid-hydrofluoric acid mixed acid digestion system is adopted, so that the manganese element in the copper concentrate is completely dissolved, and the interference of a complex matrix on manganese determination is effectively solved; by combining the high sensitivity and multi-element analysis capability of the inductively coupled plasma emission spectrometer, a linear standard curve of a manganese element characteristic spectral line and concentration is established, and the accuracy and precision of quantitative analysis are remarkably improved.

The invention discloses a method for simultaneously determining total barium and sulfur in barite by inductively coupled plasma emission spectrometry. In this method, the sample is decomposed by melting with sodium carbonate and sodium hydroxide. The molten slag is extracted with hot water, nitric acid and a chromium internal standard solution are added, the crucible and the beaker are washed with dilute hydrochloric acid, water is added and shaken well, heated to boiling gently on a hot plate and then taken off and shaken well. After cooling, it is determined on an inductively coupled plasma emission spectrometer. The method of the invention makes use of the characteristic that barium sulfate has a relatively large solubility in reverse aqua regia, enabling barium and sulfur to coexist stably, and then simultaneously determines total barium and sulfur by inductively coupled plasma emission spectrometry, which has the characteristics of high detection efficiency, high precision, simple operation and low cost, and solves the technical problems that when determining total barium and sulfur in barite by traditional methods, sulfur and barium are difficult to coexist in the solution, usually two different methods are required to complete the determination, and even barium and sulfur need to be separated in advance, resulting in a long process and low detection efficiency.

The utility model relates to the technical field of glass instrument safe cleaning, and discloses a chemical laboratory glass instrument safe cleaning and drying rack which comprises a drying box, clamping grooves are formed in the left side and the right side of the interior of the drying box, and connecting blocks are slidably connected to the upper end and the lower end of the interior of the drying box. Two pressing blocks are slidably connected to the front end of the interior of the connecting block, sliding blocks are slidably connected to the left side and the right side of the interior of the connecting block, connecting rods are rotatably connected to one sides of the exteriors of the sliding blocks, and pushing blocks are fixedly connected to the two sides of the exteriors of the sliding blocks. The beaker placing rack can adapt to glass instruments of different sizes, and for small beakers, the distance between the placing racks can be properly adjusted to be small, so that excessive concentration of heat is avoided, and overheating is prevented; and for a large beaker, the spacing can be increased to ensure that the beaker can be in full contact with heat flow, so that the surface is uniformly heated, the drying time is obviously shortened, and the drying efficiency is improved.

The invention belongs to the field of single crystal growth, and particularly relates to a novel single crystal with ferroelectricity and ferromagnetic orderliness at room temperature and a growth method. Comprising the following steps: grinding a composition 1 and a composition 2 in an aluminum oxide mortar, putting into a platinum crucible, putting the platinum crucible into an aluminum oxide crucible, putting the aluminum oxide crucible into a single crystal growth furnace, adjusting a temperature program, cooling to room temperature, and taking out the platinum crucible; and S2, putting the platinum crucible taken out in the step S1 into a beaker, adding dilute nitric acid, and carrying out ultrasonic cleaning to obtain the novel ordered single crystal with ferroelectricity and ferromagnetic at room temperature. The high-temperature melting method is adopted for the first time to grow the novel single crystal with ferroelectricity and ferromagnetic ordered state at the same time under the room temperature condition, and the operation method is simple and easy to implement.

The invention discloses a method for preparing nano aluminum oxide by a microreactor. The method comprises the following steps: S1, mixing aluminum salt and an alkaline solution through the microreactor, and standing and aging to obtain hydroxide precipitate; and S2, carrying out heat treatment on the hydroxide, and cooling, washing and drying after the treatment is finished, so as to obtain the nano aluminum oxide. The average particle size of the spherical aluminum oxide nano particles synthesized by the method is 16.8 nm, the average particle size of the spherical aluminum oxide nano particles synthesized by a traditional beaker method is 126.76 nm, and the average particle size of the spherical aluminum oxide nano particles synthesized by the method is reduced by 82.22% compared with the average particle size of the spherical aluminum oxide nano particles synthesized by the traditional beaker method, so that the invention provides an extensible nano material synthesis strategy.

The invention discloses a preparation method for improving the deacetylation degree of chitosan, which comprises the following steps: step S1, crushing crab shells, cleaning the processed eriocheir sinensis shells, drying at 65 DEG C, grinding the dried crab shells, and sieving with a 100-mesh sieve to prepare crab shell powder; s2, plasma pretreatment: mixing the crab shell powder with distilled water according to the ratio of 1: 20 (w / v), performing pretreatment by adopting atmospheric pressure plasma jet, putting a beaker loaded with a crab shell powder solution into a 180 rpm magnetic stirrer, treating for 60 minutes under the conditions that the power is 750 W and the gas flow is 1.2 L / min, washing to be neutral, and drying at 65 DEG C to obtain the plasma pretreated crab shell powder, the deacetylation degree of chitosan is increased by 4-7% through plasma pretreatment, the product purity is equivalent to that of commercial chitosan, and the production cost is saved; the performance of the chitosan extracted by the method is superior to that of chitosan extracted by a traditional chemical extraction method.