Method for synthesizing rare-earth organic-inorganic hybrid fluorescent material

The invention provides a novel method for synthesizing rare-earth organic phosphotungstate hybrid compound (Ln(PW11O39)(H2O)2)(H2bpy)2.6.5H2O(Ln=Eu(1), Gd(2); bpy=4,4'-bipyridyl). The hybrid compound belongs to a triclinic system, has a space group of P(-1) and is synthesized by Ln2Cl3.6H2O, 4, 4'-bipyridyl, (NH4)3PW12O40.3H2O and deionized water by a hydro-thermal method. A fluorescence spectrum displays that the compound has the obvious fluorescent characteristics.

Supplementary device of ascending a height

The utility model discloses a supplementary device of ascending a height belongs to electric power climbing instrument field. Including length scalable's base, pillar and cat ladder, the pillar is vertical to be fixed on the base, and the top of pillar is fixed and is equipped with the supporter, and cat ladder one end articulates on the base, and the other end supports the bottom at the supporter, base, pillar, cat ladder and supporter constitution ladder type structure. The utility model discloses the equipment of putting up, change in the work of the operation and maintenance management of mainly used transformer substation one, secondary sign etc. Have safe and reliable, convenient to use's advantage.

Monitoring method and device of electronic equipment, electronic equipment and storage medium

The invention provides a monitoring method and device of electronic equipment, the electronic equipment and a storage medium, and belongs to the field of data processing.The method comprises the steps that a historical sampling data set A of a target monitoring index is obtained; obtaining a mean value list set D based on A; based on D, acquiring a fluctuation value list set S; clustering the fluctuation values in the S based on a set clustering method to obtain a plurality of initial classes; for any initial class, obtaining a mean value of a mean value list corresponding to each contained fluctuation value, and clustering the contained fluctuation values according to the obtained mean value of the mean value list corresponding to each fluctuation value to obtain a plurality of target classes; determining a monitoring threshold value corresponding to each target class; and fusing any target class time window to obtain at least one fusion time period, and setting a corresponding monitoring ...

Memory device and protection method

The invention discloses a memory device and a protection method thereof. The memory device comprises a memory unit, a memory control unit, a switch and a control circuit, wherein, the memory control unit is used for reading and writing the memory unit and internally provided with a protection unit; the switch is provided with a keyed end and a normal end; the control circuit is coupled between the switch and the memory control unit and used for detecting the position of the switch. When the memory device receives the working voltage and the switch is positioned at the keyed end, the control circuit can automatically cause the protection unit to forbid the memory control unit to read or write in the memory unit.

Synthesis method for hydroxypropyl methyl cellulose grafted methyl acrylate/vinyl acetate sand-fixing agent

Belonging to the technical field of novel sand solidification agents, the invention in particular relates to a synthesis method for a hydroxypropyl methyl cellulose grafted methyl acrylate/vinyl acetate sand-fixing agent. An emulsion graft copolymerization method is employed to prepare sand solidification agent materials into a hydroxypropyl methyl cellulose (HPMC) grafted methyl acrylate (MA)/vinyl acetate (VAc) emulsion. The method provided by the invention has simple synthesis steps. The product has good thermal stability, adhesion, water retention and compressive strength, can satisfy the requirements in actual sand-fixing application, and can be bell applied in wind prevention and sand fixation, thus having good application prospects.

Safety detection system

The invention relates to the technical field of safety detection, and particularly provides a safety detection system, which comprises a transformer substation server, an industrial personal computer and a control module, and is characterized in that the control module is provided with a single chip microcomputer, a first USB interface, a second USB interface and a third USB interface; the first USB interface and the second USB interface are connected through a first switch, the first USB interface and the third USB interface are connected through a second switch, the single-chip microcomputer is connected with the first switch, the second switch and the second USB interface, the industrial personal computer is provided with a fourth USB interface, the second USB interface is connected with the fourth USB interface, and the industrial personal computer is provided with a power supply. The transformer substation server is provided with a fifth USB interface, and the fifth USB interface is ...

Method for preparing homogenous-phase nanometer aragonite-type calcium carbonate by acid hydrolysis of limestone

The invention discloses a method for preparing homogenous-phase nanometer aragonite-type calcium carbonate by acid hydrolysis of limestone. The method comprises the following steps of firstly grinding limestone into limestone powder; dissolving limestone powder with hydrochloric acid into a solution taking CaCl2, MgCl2, FeCl3 and FeCl2 as main components; adding NaClO so that Fe<2+> is oxidized to Fe<3+>; adding ammonia water to adjust the pH value of the solution such that Fe<3+> in the solution is removed in a form of Fe(OH)3; further adding ammonia water to adjust the pH value of the solution to 10.5-11 and carrying out suction-filtration to remove magnesium; and finally introducing CO2 and reacting at 50-70 DEG C to form CaCO3 precipitate, filtering, washing and drying to obtain high-purity homogeneous-phase nanometer aragonite-type calcium carbonate. Compared to methods in the prior art, by the method disclosed by the invention, under the premise of no need of any crystal-form control ...

Memory device and protection method

Electric firing head ignition circuit for thermal battery

The invention discloses an electric firing-head ignition circuit for a thermal battery, comprising an energy-storage tantalum capacitor C1, an isolating diode D1, a voltage-regulation tube DW1, a voltage-regulation tube DW2, a resistance R2, an anti-jamming ceramic capacitor C2 and an NPN triode Q2, wherein the energy-storage tantalum capacitor C1 accumulates and controls the electric energy transferred from the circuit, and the isolating diode D1 prevents the energy-storage tantalum capacitor from discharging to a control circuit; the voltage-regulation tube DW1, the voltage-regulation tube DW2, the resistance R2, the anti-jamming ceramic capacitor C2 and the NPN triode Q2 commonly form a circuit for detecting the voltage of the energy-storage tantalum capacitor C1 to indirectly control ignition time of the circuit; the NPN triode Q2, three current-limiting resistances, a PNP triode Q1 and a PNP triode Q3 form a three-triode positive feedback operating circuit; and the energy-storagetantalum ...

5-sulfosalicylic acid intercalation pillared Mg-Al-Tb hydrotalcite and preparation method of Mg-Al-Tb hydrotalcite

The invention belongs to the field of rare earth ion photoluminescence materials, and specifically relates to a method of preparing 5-sulfosalicylic acid intercalation pillared Mg-Al-Tb hydrotalcite by using a coprecipitation method and an ion exchange method. According to the preparation method provided by the invention, Mg-Al-Tb carbonate hydrotalcite is prepared through the acid-base double dropping coprecipitation method, and then the 5-sulfosalicylic acid intercalation pillared Mg-Al-Tb-SSA hydrotalcite is prepared through calcination reduction and ion exchange. The preparation method provided by the invention uses an inorganic material as a matrix, has a simple and convenient process, is environmentally friendly and has good stability. In the preparation method provided by the invention, a relationship between the luminescent property of Tb<3+> ions and the structure of hydrotalcite is researched through the change of a proportion of Mg<2+>/(Al<3+>+TB<3+>), and the research can be ...

Electric firing head ignition circuit for thermal battery

The invention discloses an electric firing-head ignition circuit for a thermal battery, comprising an energy-storage tantalum capacitor C1, an isolating diode D1, a voltage-regulation tube DW1, a voltage-regulation tube DW2, a resistance R2, an anti-jamming ceramic capacitor C2 and an NPN triode Q2, wherein the energy-storage tantalum capacitor C1 accumulates and controls the electric energy transferred from the circuit, and the isolating diode D1 prevents the energy-storage tantalum capacitor from discharging to a control circuit; the voltage-regulation tube DW1, the voltage-regulation tube DW2, the resistance R2, the anti-jamming ceramic capacitor C2 and the NPN triode Q2 commonly form a circuit for detecting the voltage of the energy-storage tantalum capacitor C1 to indirectly control ignition time of the circuit; the NPN triode Q2, three current-limiting resistances, a PNP triode Q1 and a PNP triode Q3 form a three-triode positive feedback operating circuit; and the energy-storage tantalum ...

Method for preparing homogenous nano vaterite type calcium carbonate through limestone acidolysis

The invention discloses a method for preparing homogenous nano vaterite type calcium carbonate through limestone acidolysis, which comprises the following steps: crushing limestone, and pulverizing into powder; dissolving with hydrochloric acid, thus obtaining a solution containing main components CaCl2, MgCl2, FeCl2, FeCl3 and the like; adding NaClO to oxidize Fe<2+> into Fe<3+>; adding ammonia water to gradually regulate the pH value, and ensuring that the Fe<3+> and Mg<2+> in the solution are removed in the form of Fe(OH)3 and Mg(OH)2, thus obtaining a CaCl2-NH4Cl solution; and finally introducing CO2, reacting to form a CaCO3 precipitate, filtering, washing, and drying to obtain the high-purity homogenous nano vaterite type calcium carbonate. According to the invention, the homogenous calcium carbonate metastable state crystal form vaterite type can be prepared without adding any additive and crystal form control agent; and the prepared nano vaterite is self-assembled into a spherical ...

Method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones

The invention discloses a method for preparing high purity aragonite type nano calcium carbonate by acidolysis of limestones and belongs to the technical field of preparation of nanomaterials. The method comprises the following steps: by using an abundant mineral resource limestones in nature as raw materials, directly acid leaching without adding any additive; and carrying out a replacement reaction on the acid-leached CaCl2-NH4Cl filtrate and a sodium carbonate solution to obtain the high purity aragonite type nano calcium carbonate. The method disclosed by the invention avoids high temperature sintering, can save the energy consumption, reduce dust pollution generated by combustion of coal and solve the problem that the utilization ratio of the mineral resource is low, and can realize clean and environment-friendly production. The method disclosed by the invention is simple to operate and low in cost and the prepared aragonite type nano calcium carbonate is high in yield and purity and ...