Chinese Academy of Sciences

Intelligent Equipment Research Center, Beijing Academy of Agriculture and Forestry Sciences

Beijing Research Center of Intelligent Equipment for Agriculture

Ruirui Zhang

Suojiang Zhang

Liping Chen

Ruixia Liu

Longlong Li

Tongchuan Yi

Gang Xu

Bin He

Fei Dai

Junping Zhang

Shengxin Chen

Yao Wen

Hongguo Tang

Chenchen Ding

Provided are a nozzle device for a plant protection unmanned aerial vehicle and a droplet diameter control method thereof. The nozzle device for a plant protection unmanned aerial vehicle includes a flexible nozzle body, a magnetostrictive sleeve, and a coil. The flexible nozzle body is provided with a nozzle exit, a periphery of the flexible nozzle body is provided with a guide surface at a position corresponding to the nozzle exit, the magnetostrictive sleeve is sleeved on the periphery of the flexible nozzle body and abutted against the guide surface. The coil is wound around the periphery of the magnetostrictive sleeve. When the coil is supplied with a current to generate a magnetic field, the magnetostrictive sleeve can move relative to the guide surface, the guide surface squeezes the nozzle exit to deform the nozzle exit, thus adjusting the size of the nozzle exit.

Nozzle device for plant protection unmanned aerial vehicle and droplet diameter control method thereof

A system and a method for evaluating atomization efficiency of a wind-driven atomizer. The system for evaluating atomization efficiency of a wind-driven atomizer comprises a detection platform, a wind tunnel mechanism and a traction measurement mechanism are arranged above the detection platform, the traction measurement mechanism is disposed beside the wind outlet end of the wind tunnel mechanism, an atomizer mechanism and an atomization measurement mechanism are sequentially disposed on the detection platform along the direction of a wind field provided by the wind tunnel mechanism, and the atomizer mechanism is connected with the traction measurement mechanism. The system and the method may effectively evaluate the atomization efficiency and provide quantitative evaluation indicators for the detection of working performance of the wind-driven atomizer, and has the advantages of convenient operation, accurate detection, precise measurement results, and high reliability of evaluation indicators.

System and method for evaluating atomization efficiency of wind-driven atomizer

Provided are an oxovanadium phosphate catalyst, and a preparation method and an application therefor. The method includes: 1) mixing and reacting a vanadium source, a choline chloride-organic carboxylic acid eutectic solvent, and alcohol; 2) mixing the obtained reaction product with a phosphorus source, raising the temperature to a temperature higher than the melting point of the eutectic solvent, and continuing the reaction to obtain an oxovanadium phosphate precursor; and 3) calcining to obtain the oxovanadium phosphate catalyst. The alcohol is: benzyl alcohol or a mixture of C-Cmonohydric alcohol and benzyl alcohol. The present method uses a green and inexpensive eutectic solvent to strengthen the preparation of oxovanadium phosphate catalyst, avoids the disadvantages of the prior art, and overcoming the problems of low yield and poor selectivity when used in a reaction to prepare maleic anhydride by catalytic n-butane selective oxidisation.

Oxovanadium phosphate catalyst, and preparation method and application therefor

The present invention relates to the technical field of chemical engineering and catalysis. Provided are an application of an ionic liquid in propylene glycol ether synthesis and a method for synthesizing a propylene glycol ether. The ionic liquid is a methyl carbonate ionic liquid, and is used as a catalyst for catalyzing propylene glycol ether synthesis. The method for synthesizing the propylene glycol ether comprises the following steps: placing propylene oxide and an alcohol within a reactor to contact a catalyst, and heating the mixture in an enclosed environment to 50-200&#xb0; C. to obtain the propylene glycol ether, wherein the catalyst is a methyl carbonate ionic liquid. The method for synthesizing propylene glycol ether provided in the present invention is a green synthesis technique, and does not require special production equipment. The method has simple and easily controllable processes, and can be used in industrial production and applications.

Application of ionic liquid in propylene glycol ether synthesis and method for synthesizing propylene glycol ether

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Beijing, China

Ruirui Zhang