1449 results about "Beaker" patented technology

The invention discloses a double-component fluorosilicone rubber ice-covering-proof coating material and a preparation method thereof. The preparation method comprises the following steps: dissolving fluorine-containing acrylate in solvent, adding a platinum catalyst, uniformly stirring, and pouring into a four-neck flask; starting an electromagnetic stirrer, introducing inert gas, heating in water bath, adding hydrogen-containing silicone oil, and reacting to generate fluorine modified silicone oil; placing vinyl terminated polydimethylsiloxane in a beaker, adding 5-40 parts by mass of white carbon black used as reinforcement filler, evenly stirring, then adding 0.5-5 parts by mass of whitener TiO2, and evenly stirring; weighing 1-5 parts by mass of hydrogen-containing silicone oil and 1-5 parts by mass of fluorine modified silicone oil, placing in the beaker, evenly stirring, adding 10-50mu L of platinum catalyst, and finally adding the solvent; and evenly coating through a spin coater, and curing in a baking oven for 1-4 hours, thus obtaining the double-component fluorosilicone rubber coating. The invention overcomes the defects in the prior art, uses polyorganosiloxane as the raw material, can achieve satisfactory ice-covering-proof effect and is used in the fields of paint and the like.

The invention relates to a gas oil base invert oil-emulsion drilling fluid and a preparation method, wherein the total volume of gas oil and calcium chloride aqueous solution is 100 parts: the volume ratio of oil phase to water phase is between 95:5 and 70:30, and the concentration of calcium chloride aqueous solution is 5%-saturation; the required gas oil, primary emulsion, auxiliary emulsion and wetting agent are added into a high speed mixing beaker, and are mixed at high speed for 2-5 minutes; the calcium chloride aqueous solution is added and mixed at high speed for 15 minutes; organic soil, calcium oxide and a fluid loss agent are added and mixed at high speed for 10 minutes; and the required amount of barite is added according to density, and is mixed at high speed for 25 minutes. The gas oil base invert oil-emulsion drilling fluid is used for overcoming the defects of the existing gas oil base drilling fluid and solving the problems of the salt resistance and temperature resistance of the gas oil base drilling fluid, and can resist the temperature above 200 DEG C.

The invention discloses a preparation method for jute-based active carbon, and the method comprises the following steps of: weighing jute fibres or crushed jute stem materials, cleaning and drying, soaking in a beaker filled with a 3-5mol / L phosphoric acid solution, boiling for 3-10 hours in a water bath, adequately penetrating an activating agent into the fibres, then taking out and drying; placing in a vacuum tubular high-temperature sintering furnace, activating to 400-500 DEG C in a nitrogen atmosphere, insulating for 1-3 hours, or placing in a columnar quartz tube, placing in a microwave device, and performing a microwave irradiation reaction with a microwave irradiation power of 100-700 W and an irradiation time of 5-30 minutes in the presence of nitrogen used as protective gas; and cooling to a room temperature, then taking out, acid-washing and repeatedly water-washing until the pH is 6-7, and then drying to obtain the jute-based active carbon. The jute-based active carbon prepared by the method has the advantage of being high in methylene blue adsorption value and activation yield.

The invention discloses a method for rapidly detecting the content of aflatoxin. The method comprises the following steps of: after smashing a sample to be detected, putting the sample powder into a beaker, and adding an extractant for shaking or performing ultrasonic extraction; filtering, performing water bath evaporation on a filtrate, and metering the volume to obtain a test sample; respectively pointwise adding the test sample and an aflatoxin B1 standard substance which are commensurate on a thin-layer silica gel plate, pointwise adding derivative reagents into sampling points, and respectively developing by developers; and comparing the fluorescence intensity of the test sample and the aflatoxin B1 standard substance under an ultraviolet lamp to judge whether the content of the aflatoxin in the test sample exceeds the standard. The method for rapidly detecting the content of the aflatoxin has the advantages of small solvent amount, simple sample treatment and short measurement time; the method does not need a professional, only needs small apparatus, and is particularly suitable for rapid field detection; and the method effectively avoids the harm and the pollution of trifluoroacetic acid to operators and the environment, improves the method sensitivity, and has the lowest detectable amount of 0.00032 mu g and the lowest detection limit of 3 mu g / kg.

The invention provides a method for synthesizing a silicoaluminophosphate molecular sieve SAPO-11 at normal pressure. The method is characterized in that the main process comprises the following steps of 1) preparation of eutectic mixture: fully grinding and mixing quaternary ammonium salt and organic acid or organic alcohol in a mortar with a mol ratio of 0.1 to 1.0; placing the mixture in a beaker, heating the beaker at a temperature of 80-180 DEG C to melt the mixture into transparent liquid, so as to obtain the eutectic mixture; 2) preparation of crystallization reaction mixture: adding phosphorus source, silicon source, mineralizing agent, template agent and aluminum source into the molten eutectic mixture in sequence, uniformly stirring the mixture at a mixing temperature range from 80 to 150 DEG C to form a reaction mixture; 3) crystallizing the reaction mixture prepared by step 2); and 4) water cooling the reactant reacted in step 3) to a room temperature, washing and separating the mixture, and drying and baking the washed and separated mixture, wherein the washed filtrate is recovered after rotary evaporation.

The invention discloses an acid liquor friction reducer and a preparation method thereof. According to the invention, the preparation method comprises the following steps: weighing monomer 2-acrylamide-2-methylpro panesulfonic acid; placing into a beaker; adding deionized water for dissolution; adding caustic soda flakes to adjust to the pH value of the system to be 8-10; adding monomer acrylamide and long-chain cation monomer; mixing under the condition of supplying an inert gas; adjusting the water bath temperature to be the initiation reaction temperature and adding an initiator; reacting to obtain transparent gelatin blocks; manually cutting the transparent gelatin blocks; drying, smashing, and screening with 100 mesh to obtain powdered acid liquor friction reducer. According to the invention, the synthesis method is simple, the raw materials are easy to obtain, and the cost is lowered; the acid liquor friction reducer prepared by the invention has a friction reducing rate as high as 65%, the pump pressure is reduced, the pipe line loss is reduced, and the service life of equipment is prolonged; the acid liquor friction reducer is good in temperature tolerance and compatibility, and has a certain speed reducing effect.

The invention discloses a method for in-situ full-field early detection of stainless steel pitting. The method comprises the following steps of 1, carrying out packaging of a stainless steel sample and carrying out mechanical polishing of a working face of the stainless steel sample, 2, preparing an experimental soak solution, and 3, putting a beaker containing the experimental soak solution obtained by the step 2 into a constant-temperature water bath, finishing detection temperature setting, putting the stainless steel sample treated by the step 1 into the beaker in a way that the working face of the stainless steel sample is upward, simultaneously, carrying out an in-situ full-field observation process on the surface of the stainless steel sample by a long-distance microscope and a digital camera, wherein when a display shows that blue spots appear on the surface of the stainless steel sample, pitting occurs, and recording the time between putting-in and taking-out of the stainless steel sample. The method can realize rapid in-situ detection of stainless steel pitting. Pitting information which comprises stainless steel pitting positions, stainless steel pitting number, stainless steel pitting areas and stainless steel pitting occurrence time and can be detected by the method has important academic values and practical application values.

A device for testing the rate of inflammable gas given off when matter meets water is characterized in that a constant voltage separating funnel with a side pipe is communicated with a conical beaker by a three way pipe; the conical beaker is arranged in a thermostatic water bath circulator which is internally provided with water bath for heating and cooling; the side pipe of the constant voltage separating funnel and the outlet of the bottom thereof are respectively provided with a switch; the outlet at the side of the three way pipe is communicated with the air inlet of a flow meter; the air outlet of the flow meter is communicated with a surge flask; the input end of a monitor is connected with the output end of the flow meter. The device can be used for judging fatalness when the matter meets wet, has the real time supervisor control function, does not need manual time-keeping, weighting and calculation; after the testing is over, the starting time of the testing is input, and then the real time monitoring data can be led out, thus avoiding the problem that the manual weighting can not exactly measure the rate of inflammable gas given off when the matter meets water, meanwhile, saving the precious manpower and time and greatly improving work efficiency.

The invention discloses a method for preparing two-dimensional silver nanosheets of different shapes. Firstly, a silver mirror reaction is adopted, glucose serves as a reducing agent, a quantitative silver-ammonia solution and the quantitative glucose solution are sequentially added into a beaker to be mixed, then cetyl trimethyl ammonium bromide serves as a surface active agent, the cetyl trimethyl ammonium bromide solution is added into the mixed solution, then high-temperature reaction is carried out on the mixed solution, and a solution of the two-dimensional silver nanosheets of the different shapes is prepared by adjusting the concentration ratio of the cetyl trimethyl ammonium bromide solution and the silver-ammonia solution. The method has the advantages that operation is easy, cost is low, equipment is simple, and the prepared silver nanosheets are uniform in grain size, good in water solubility and free of obvious gathering.

The invention discloses a preparation method of a network polyaniline conducting active material. The method comprises the following steps: dispersing 0.5mL of aniline in a beaker containing 50mL of deionized water by ultrasonic for 1 hour to obtain an aniline ultrasonic dispersion solution; weighing a certain amount of phytic acid, adding into the aniline ultrasonic dispersion solution, carrying out ultrasonic dispersion for 1 hour to obtain an aniline-phytic acid mixed solution, putting in an ice water bath, and cooling the aniline-phytic acid mixed solution to 0-5 DEG C; weighing ammonium persulfate and 5mL of 1mol / L hydrochloric acid solution, adding into a beaker containing 50mL of deionized water, and uniformly mixing to obtain a mixed solution; and dropwisely adding the mixed solution into the aniline-phytic acid mixed solution, carrying out polymerization reaction for 6 hours, carrying out vacuum filtration and washing with deionized water until the filtrate is neutral, putting the filter cake in a 50-DEG C vacuum drying oven, drying for 24 hours, grinding, and collecting to obtain the network polyaniline conducting active material.

The present invention relates to a preparation method of a natural hairtail essence. The method of the invention comprises the steps of: selecting iced fresh hairtail as a main raw material; treating the raw material with a pretreatment; adding water and mincing the hairtail; mixing the hairtail mince with water in a certain proportion; homogenizing; placing the mixture in a beaker; connecting the beaker with a water bath with constant temperature; stirring constantly with a stirrer; adding enzyme for reaction with pH and temperature controlled at a certain level, wherein natural pH decline is allowed in the enzymatic reaction process; reacting at a constant temperature for a while; placing in a water bath to inactivate the enzyme; centrifuging to obtain a supernatant, so as to obtain a precursor of the natural hairtail essence; and adding sugar, amino acid, thiamine and hydrolyzed vegetable protein for a heat reaction, so as to obtain the natural hairtail essence. The natural hairtail essence obtained by the invention has advantages of strong fragrance, thickness, satiation,and fragrance similar to natural fragrance; besides, the natural hairtail essence stimulates development of hairtail products, diversifies fish flavor essence product on the market and satisfies the market demands on hairtail products and a variety of convenient fish food by people.

The invention discloses a preparation method of graphite oxide. The preparation method comprises the steps: adding concentrated sulfuric acid in a dry beaker, cooling with ice water, adding a solid mixture of flake graphite and NaNO3 under constant stirring, and then slowly adding a potassium permanganate powder; after finishing addition of KMnO4, removing the water bath, and continuing stirring; slowly adding deionized water, stirring, then adding deionized water for dilution, carrying out a reaction under a condition of normal temperature, then adding hydrogen peroxide, reducing a residual oxidant until the solution becomes bright yellow, and then centrifuging to obtain a yellow-brown residue; respectively washing by an HCl solution and deionized water for 3 times, and centrifuging for one time after each washing until the filtrate is neutral; and finally placing the filter cake in a 60 DEG C drying box, and fully drying. The preparation method is safe and simple in operation and low in equipment requirements, can prepare graphite oxide with relatively high carbon-oxygen ratio; and moreover, the graphite oxide prepared by the method can be used for preparing graphene, and graphene is further applied in battery materials, composite materials, electronic devices, energy storage materials and other fields.

The invention discloses a preparation method of environment-friendly low-toxic fluorescent carbon nano particle liquor, and relates to a preparation method of fluorescent particle liquor. The method comprises the following steps: weighing 1.0g of citric acid by a scale; placing 2.0g of amino acid in a mortar and uniformly grinding and porphyrizing; placing grinded citric acid and amino acid in a 50ml beaker; adding 20ml of ethylene glycol and stirring on a magnetic stirring apparatus; heating at 60 DEG C to dissolve the citric acid and amino acid so as to obtain colorless and transparent liquor; transferring the colorless and transparent liquor to a reaction kettle which is internally sleeved with a polytetrafluoroethylene material and externally sleeved with a stainless steel material; placing the reaction kettle into a constant temperature drying box to heat at 150-180 DEG C for 3 hours; and then, taking out the reaction kettle from the constant temperature drying box to naturally cool to room temperature so as to obtain the brown fluorescent carbon nano particle liquor.

The invention discloses an efficient inhibitor composition for copper-sulfur separation and a copper-sulfur separation flotation method by applying the same. The inhibitor composition (XKY-03) comprises, by mass percentage, 55-70% of sodium humate, 20-35% of potassium permanganate and 5-10% of sodium thioglycollate; and a preparation method of the inhibitor composition (XKY-03) comprises the stepsof taking a beaker as a container at normal temperature and normal pressure, and stirring for 40-50 minutes by a magnetic stirrer. According to the inhibitor composition (XKY-03) prepared by the preparation method, the copper-sulfur separation can be effectively realized, the sulfur-iron ore which is activated by Cu2+ can be inhibited, the grade and the recovery rate of copper in the copper concentrate can be improved, meanwhile, the complexation reaction can occur between the inhibitor composition (XKY-03) and unavoidable ions in the ore pulp such as Cu2+, Pb3+, Fe3+ and the like, so that the concentration of the unavoidable ions in the ore pulp is reduced, and the activation effect of the unavoidable ions on the pyrite ore is reduced; and additionally, the inhibitor composition (XKY-03)further has the characteristics of less use amount, low toxicity and the like, and is suitable for popularization and application.

The invention relates to an STF (shear thickening fluid) as well as a preparation method and an application thereof. The preparation method comprises steps as follows: polyethylene glycol and nano silica are weighed respectively, the weighed polyethylene glycol is poured into a beaker, a stirring bar is added, and the beaker is put in a magnetic stirrer; stirring starts, weighed nano silica is added to the beaker in separate times at the room temperature, and stirring is continued after addition; stirring is stopped, the beaker is put in a vacuum drying oven for standing, bubbles in a dispersion system are removed, and the STF is obtained. By means of the STF, shock resistance of body armour fabric to bullets or shrapnels is enhanced; the STF is reversible, so that softness of the material can still be kept after impact property of the bullets or the shrapnels disappears. The provided body armour fabric is high in modulus, low in breaking elongation and high in work of fracture and has strong capacity of absorbing energy of impact.

The invention discloses a method for testing the porosity of a battery diaphragm coated alumina ceramic coating, which comprises the following steps: (a) on a diaphragm of a ceramic coating to be tested, punching a sample by using a perforating machine; (b) carrying out weighting and thickness testing on the punched sample; (c) placing the sample in a beaker filled with a chloroazotic acid, after the sample is soaked 24 hours, taking out the sample, placing the sample in a solution filled with NaOH to rinse, and then washing the sample by using distilled water; (d) placing the sample in a baking oven at a temperature of 80 DEG C to bake, and after the sample is taken out, carrying out weighting and thickness testing on the sample; and (e) according to the changes in thickness and weight of the sample before soaking and after baking, through a calculation formula, conveniently, accurately and effectively obtaining the porosity of the ceramic coating. The method is simple and easy to implement, reliable and applicable.

The invention relates to a method for rapidly measuring the molecular ratio of an acid KF-NaF-AlF3 electrolyte system, which is characterized in that the measuring process comprises the following steps of: firstly, preparing NaF standard solution, measuring the conductivity of the standard solution, drawing a graph by using the conductivity as the horizontal ordinate and using the concentration of the corresponding NaF standard solution as the vertical coordinate, and carrying out linear fitting to obtain a standard curve equation; then weighing 2 to 4 grams of a dried electrolyte sample, adding 1 to 2 grams of NaF, at least grinding for 5 minutes in an agate mortar, sintering for 15 to 50 minutes in a muffle furnace at a temperature of 600 to 700 DEG C, taking out the obtained product, cooling, grinding fine and weighing, then transferring all the obtained product into a beaker, adding 100 to 200 mL of deionized water, stirring on a magnetic stirrer and measuring the conductivity of the solution; and measuring the content of NaF or KF or other components in the electrolyte and then calculating the molecular ratio. The method disclosed by the invention is rapid, simple and convenient. The measurement error of a measurement result is less than plus and minus 2 percent. The method has good reproducibility. The molecular ratio of the KF-NaF-AlF3 electrolyte system can be accurately and rapidly measured.

The invention discloses a method for quickly measuring sulfate radical content in a magnesium method desulfurization process. The method consists of the processes of filtration, constant volume determination, acidification, precipitation and back titration and comprises the following steps of: filtering a fetched sample by using filter paper; filling quantitative filtered clear solution with constant volume into a volumetric flask; filling proper constant volume clear solution in a beaker, and adding diluted hydrochloric acid of 1:1 concentration for acidifying; adding excessive barium chloride into the acidified clear solution to perform precipitation; filtering and fully washing the sediment, and titrating the total weight of barium, calcium and magnesium ions by using ethylene diamine tetraacetic acid (EDTA) coordination agent under the condition that chrome black T is used as an indicator; and meanwhile, calculating the content of the barium ions by measuring the total weight of the calcium and the magnesium so as to calculate the content of the sulfate radicals. The method has the advantages that: the control of solution concentration and measuring process conditions is accurate, the measurement of the content of the calcium and the magnesium is completed at the same time, and the preparation of barium and magnesium mixed solution is not needed; the accuracy of the sulfate radical detection is improved, and the detection time is shortened; and the method is suitable for quickly measuring the sulfate radical content in the debugging and operating process of a magnesium oxide method desulfurization system.

The invention discloses a strawy nanostructure and the preparation method. The strawy nanostructure is directly grown through a plurality of clusters of nano-wires from a base; the strawy nanostructure is thick, and the end is sharp; the length is 30 to 60 Mum; the diameter at the top end is 100 to 300nm. Compared with the synthesized nanostructure in the prior art, the preparation method has the advantages of low growth temperature (the preparation is performed only at ambient temperature and the maximum temperature in the small beaker is only 50 DEG C), reduced equipment requirements, low required pressure (only atmospheric pressure), easy operation, simple method, no need of catalyst, resource saving, low cost, good repeatability, and large growth area.

The invention discloses a NiO / MXene composite material as well as a preparation method and application thereof. The composite material takes MXene as a supporting carrier, and NiO particles are uniformly dispersed on the surface of MXene, wherein the mass ratio of NiO to MXene is (2.98-50):50. The preparation method comprises the following =steps: (1) etching a certain amount of MAX material intoa HF acid solution with certain concentration, so as to obtain an MXene material; (2) mixing and stirring a certain amount of nickel salt and the MXene obtained in the step (1) into a beaker while dropwise adding a NaOH solution with certain concentration, stirring for a period of time, then washing, centrifuging, and carrying out vacuum freeze drying; and (3) putting a mixture prepared in the step (2) into a tubular furnace, and calcining in nitrogen atmosphere, so that the target product is obtained. The NiO / MXene composite material is applied to thermal decomposition of ammonium perchlorate(AP) and shows better catalytic effect; meanwhile, preparation technology is simple, and the NiO / MXene composite material has a good application prospect.

The invention relates to a cobalt metal organic framework material, a preparation method and applications thereof. The preparation method comprises: placing an electric-conducting glass / photoelectricmaterial as a substrate materialinto a beaker, adding a mixed solution of a divalent cobalt metal salt and an organic ligand, sealing, carrying out a heating reaction, cooling, taking out the electric-conducting glass sheet, washing, and drying to obtain the photoelectric material / cobalt metal organic framework material composite photoelectrode, wherein the prepared metal organic framework material can be used for modifying a photoelectric material. According to the invention, the preparation method is scientific and reasonable in design, simple and controllable in process, high in efficiency,low in cost, suitable for large-scale production and wide in commercial application prospect; the product has extremely high photoelectrocatalytic activity on the oxidation reaction of water in an alkaline solution, the photoelectrocatalytic effect is continuous and stable, and the product has great theoretical and practical significance.

The invention relates to a method for measuring chlorine ion in a copper-containing zinc electrolyte sample, which comprises the steps as follows: taking 20-50 mL of a zinc electrolyte sample, adding 5mL of 50% sulfuric acid, adding 0.5-1.0 g of zinc powder with purity of 99.999% or 0.2-0.5 g of aluminum powder with purity of 99.999%, stirring until reaction is finished, and diluting to 100 mL with a volumetric flask; carrying out dry filtering, adding 20-50 mL of filtrate to a 300 mL beaker, adding 5-6 mL of nitric acid, adding known amount of excessive silver nitrate (0.05 mol / L) until chlorine ion is precipitated completely, heating for boiling to precipitate and flocculate silver chloride, filtering, washing precipitate, adjusting the volume to 80-100 mL, adding 1 mL of saturated ferric sulfate solution acidified with nitric acid, titrating with 0.01 mol / L potassium thiocyanate solution until the stable red color appears in the solution, namely the end point of titration. According to the invention, the measuring method can be used for rapidly and accurately measuring chlorine ion content in the zinc electrolysis electrolyte without use of an instrument; and high-purity zinc powder or aluminum powder are adopted to remove interference metal ions, and the use amount of the reagents and the operation steps are strictly controlled, therefore, the method can be used for accurately measuring in situ and medium and small-sized laboratories.

The invention relates to a stabilizing restoration method for heavy-metal contaminated soil. The method is characterized in that Ca-Al hydrotalcite like compounds are used as restoring agents. The method comprises the specific steps of firstly, soil collecting: selecting contaminated soil samples, collecting and sending the contaminated soil to a laboratory, and detecting the heavy metal concentration and basic physicochemical properties of the contaminated soil; and secondly, stabilization experiment: weighing the contaminated soil, putting the contaminated soil into a 500ml beaker, adding Ca-Al like soil restoration agents of different mass percentages, adding deionized water of the corresponding volume in accordance with 60% of the soil maximum water-holding capacity, stirring the mixture uniformly, stabilizing the mixture under the natural condition, and taking samples on the second day, the seventh day and the fourteenth day after stabilization for leaching experiments. The stabilizing restoration method for heavy-metal contaminated soil has the advantages of being short in treatment time, wide in application range and low in cost.

The invention relates to a preparation method of a high molecular material coolant. The method comprises the following steps of: 1) placing a beaker filled with crylic acid in ice water and dropwise adding 20% sodium hydroxide liquor to prepare a sodium acrylate liquor with a certain neutralization degree; 2) adding an N-N' methylene crosslinking agent and a potassium persulfate initiator dissolved in tap water into the sodium acrylate liquor to obtain a mixed liquor; 3) adding tap water to the mixed liquor and adjusting the concentration of acrylic monomer in the mixed liquor to 20-30% in percentage by weight; and 4) placing the mixed liquor obtained in step 3) in an oven at a certain temperature to react, soaking by ethanol, cutting into pieces, drying and smashing to obtain powder coolant. When the coolant is used, the coolant and tap water are mixed according to a mass ratio of 1:1000, and the coolant is adequately swelled to hydrogel to remove moisture on the surface of the gel, packaged in a plastic bag, and frozen at a temperature below 0 DEG C for 12-14 hours to use.

The invention relates to a novel lithium ion battery positive material covering the surface of a fast ionic conductor, belonging to the field of new energy materials. A preparation method of the novel positive material comprises the steps of weighing H3PO4, TiO2, Al2O3 and Li2CO3 according to the stoichiometric ratio of Li3-2x(Al1-xTix)2(PO4)3, fully mixing uniformly in a beaker, dispersing appropriate amount of layered solid solution positive material powder Li1.5NiyCozMn1-y-zO2.5 in solution, heating at 150-200 DEG C for 1-3h, and then heating at 350-450 DEG C for 2-5h. The novel positive material adopts Li3-2x(Al1-xTix)2(PO4)3 with the rapid ionic conductivity as a coating material, the transmission speed of lithium ions on the surface of the positive material is effectively increased and the rate capability of the positive material is improved.

The invention discloses a fluorination modification method for AB3-type hydrogen storage alloy. Under the protection of argon gas, raw materials, namely alloy ingots, of the AB3-type hydrogen storage alloy which contains 0.35 stoichiometric proportion of lanthanum, 0.30 stoichiometric proportion of praseodymium, 0.35 stoichiometric proportion of magnesium, 2.90 stoichiometric proportion of nickel and 0.30 stoichiometric proportion of aluminum are prepared through a vacuum induction melting method ; after the alloy ingots are ground mechanically, a ball mill is used for milling the ground alloy ingots for 30-60 minutes at the rotation speed of 225-250 revolutions per minute to obtain milled hydrogen storage alloy used for surface modification treatment, and the milled hydrogen storage alloy is sieved through a sieve with 200-300 meshes to obtain hydrogen storage alloy powder containing the 0.35 stoichiometric proportion of lanthanum, the 0.30 stoichiometric proportion of praseodymium, the 0.35 stoichiometric proportion of magnesium, the 2.90 stoichiometric proportion of nickel and the 0.30 stoichiometric proportion of aluminum; then the hydrogen storage alloy powder is placed into a beaker containing a solution of ammonium fluoride (NH4F) with the concentration of 0.1-0.2 mole per liter and then stirred for 8-12 minutes at the temperature of 40-60 DEG C, and then a solution of sodium borohydride with the concentration of 0.05-0.06 mole per liter is added to the mixture dropwise until hydrogen bubbles disappear completely; and after the mixture is subjected to ultrasound for 0.5-1.5 hours, the hydrogen storage alloy powder containing the 0.35 stoichiometric proportion of lanthanum, the 0.30 stoichiometric proportion of praseodymium, the 0.35 stoichiometric proportion of magnesium, the 2.90 stoichiometric proportion of nickel and the 0.30 stoichiometric proportion of aluminum is washed repeatedly with deionized water and then dried for 18-22 hours in a vacuum state at the temperature of 70-90 DEG C. The circulatory stability performance and the dynamics performance of alloy electrodes, which are modified through the fluorination modification method for the AB3-type hydrogen storage alloy, are both improved.

The invention discloses a method for preparing a graphene film, which comprises the following steps of: putting oxidized graphite or expandable graphite into a heating furnace, then quickly heating the graphite to the temperature of between 700 and 1,500 DEG C, maintaining the temperature for 0.5 to 30 minutes, naturally cooling to obtain flocculent graphite, directly grinding a certain amount of flocculent graphite into powder, putting the powder into a beaker filled with liquid, standing or stirring or ultrasonically treating the solution, and then standing the solution for certain time to form the graphene film on the liquid level. In the method, the graphene obtained by high-temperature reduction and oxidation of the graphite is used as a film forming raw material and has the advantages of good reduction effect and good film electrical conductivity; and meanwhile, the very thin film is obtained by using mutual effect between the graphene and the surface tension of the liquid, and has very good transparency.

The invention provides a urine flow meter of gravitation or capacitance type in which a container is connected to a weight transducer or a capacitance sensor. An arrangement is provided to sense the level of urine in the container. An arrangement of siphon tube & solenoid valve is also provided to start and stop rinsing of the container automatically. The invention is easily adapted to a male or female type urinal. The collected urine in beaker is flushed by siphon after completion of test.